CN101497407A - Paper output mechanism - Google Patents

Abstract

The invention discloses a paper discharge mechanism. When the second roller (82) configured to move around the first roller (81) is located at the first position in the paper discharge mechanism, the two rollers (81), (82) are used to clamp the paper (P1 ), (P2) and the pair of rollers that discharge to the paper placement parts (5), (R), and the position of the second roller (82) is switched to the first position and is located closer to the first position A roller position switching mechanism (83), (84) at any one of the second positions on the paper discharge side position. The roller position switching mechanism (83), (84) is set to: when the rear end portion of the paper (P1), (P2) is discharged to the paper placement part (5), (R), the second roller (82) The position of the switch from the first position to the second position. Therefore, it is possible to stabilize the set positions of the paper sheets (P1), (P2) on the paper set parts (5), (R).

Description

paper discharge mechanism

technical field

The present invention relates to a paper discharge mechanism that discharges paper that has been conveyed to a terminal portion of a paper conveyance path from the terminal portion to a paper placement portion disposed at a height lower than the terminal portion.

Background technique

Conventionally, in printers such as photo printing systems, it is known that a paper transport path for transporting paper is provided in the main body of the printer. The end portion of this paper conveyance path is located near the paper discharge port of the printer main body. The paper (printed paper) that has been conveyed to the end portion is discharged from the end portion through a paper discharge port by a paper discharge mechanism such as a roller pair provided at the end portion.

A paper placement section is disposed near the paper discharge port on the outside of the printer main body. The paper placement section receives and places paper and is constituted by a tray or a belt of a belt conveyor (conveyor belt). In the case where the paper loading unit is a belt conveying device, the paper placed on the belt of the belt conveying device is conveyed in a direction perpendicular to the discharge direction of the paper, and then the papers of each batch of order content are separated and accumulated in the paper In the storage unit (for example, refer to Japanese Laid-Open Patent Publication No. 2001-83684).

Normally, the paper placement section is disposed at a lower height than the end portion of the paper transport path. Therefore, the front end of the paper discharged from the end portion to the paper placement portion hangs down due to gravity, and is discharged while sliding on the upper surface of the paper placement portion or the upper surface of the paper already placed on the upper surface. Therefore, after the rear end portion of the paper is discharged, the paper stop position becomes unstable due to the frictional resistance acting on the front end of the paper, so that the paper set positions differ from one paper to another. Especially in the case of cutting long paper that has been rolled into a roll shape to a predetermined length and discharging it, the paper is usually rolled with the printing surface to be printed on the outside, and the printed paper It is ejected with the printed side facing up. Accordingly, since the paper is easily kept in a wound state, the discharged paper is curled in a state in which the center portion of the paper in the longitudinal direction protrudes upward compared to both end portions. This causes greater deviation in the paper placement position. When the paper placement position is deviated as described above, there is a high possibility that there will be a problem in transfer of the paper when the paper is conveyed by the belt conveyor and the paper is moved to a storage unit or the like.

Here, if the paper discharge speed is set to be relatively fast, the paper stop position, that is, the paper placement position can be stabilized.

However, for example, when a drying device that dries the ink that has adhered to the printing surface of the paper is disposed near the discharge port in the printer main body, the discharge speed must be set at a very slow speed so that the ink can be reliably dried. , so it is difficult to set the paper ejection speed to a fast speed.

Contents of the invention

The present invention is researched and developed to solve the problem. Its object is to provide a paper discharge mechanism capable of stabilizing the placement position of the paper on the paper placement unit even when it is difficult to set the paper discharge speed to a high speed.

In order to achieve the above object, the present invention is aimed at the following paper discharge mechanism, that is, the paper discharge mechanism is provided at the end portion of the paper conveyance path, and the paper that has been conveyed to the end portion is arranged from the end portion toward the end portion. The paper placement section on a partially low height position is ejected. The paper discharge mechanism includes a roller pair and a roller position switching mechanism. The pair of rollers is composed of a first roller and a second roller configured to move around the first roller. When the second roller is located at the first position on the moving path of the second roller, the The roller and the second roller sandwich the paper, and at least one of the first roller and the second roller is driven to rotate by an actuator to discharge the paper to the paper placement unit. The roller position switching mechanism switches the position of the second roller between the first position and a second position on the moving path of the second roller closer to the paper discharge than the first position. position on one side. The roller position switching mechanism is configured such that when the paper is discharged to the paper placing unit by the first roller and the second roller positioned at the first position, when the paper is discharged to the paper placing unit, When the trailing end portion of the sheet is discharged, the position of the second roller is switched from the first position to the second position.

According to the above configuration, since the second roller moves from the first position to the second position when discharging the rear end portion of the paper to the paper placement portion, the second roller applies a force in the discharge direction to the rear end portion of the paper along with this movement, Accelerates the paper in the ejection direction. In this way, the paper after the trailing end portion is discharged easily moves against the frictional resistance applied to the front end of the paper. Therefore, even if the ejection speed is slow when ejecting the part other than the rear end portion of the paper, since the ejection speed is increased when the rear end portion of the paper is ejected, the set position of the paper on the paper placement portion is stabilized. In addition, by setting the discharge speed at the time of discharging parts other than the trailing end part of the paper at a relatively slow speed, for example, ink adhering to the printing surface of the paper can be reliably dried.

Preferably, the first position is a position where the rotation axis of the first roller is closer to the paper discharge side than the rotation axis of the second roller, and the second position is the position where the rotation axis of the second roller is closer to the paper discharge side. The rotation axis of the second roller is closer to the paper discharge side than the rotation axis of the first roller, and is a position where the paper is released from being clamped by the first roller and the second roller.

In this way, the movement stroke of the second roller from the first position to the second position can be made long, and the discharge speed of the rear end portion of the paper can be made as fast as possible. In addition, in the first position, in the case where the paper has been curled due to the nature of the paper being easily kept in a rolled state, the curl can be easily corrected (curl removal) on the paper, and the paper can be further stabilized on the paper placement section. The placement is stable. And, in the second position, because the clamping of the paper is released, the next paper enters between the first roller and the second roller smoothly, and the front end of the next paper can be prevented from being caught on the first or second roller.

Preferably, when the paper is discharged to the paper placement part by the first roller and the second roller located at the first position, when the paper is discharged to the paper placement part, At the rear end portion of the paper, the driving rotation speed of the roller driven to rotate by the actuator becomes faster.

In this way, it interacts with the switching of the second roller from the first position to the second position, the speed of the paper can be further increased in the discharge direction, and the placement position of the paper on the paper placement portion can be further stabilized.

Preferably, the roller pair is provided at a position near a paper discharge port of the printer body at an end portion of a paper transport path provided in the printer body.

In this way, it is possible to obtain an optimum paper discharge mechanism for a printer of a photo printing system using curled paper.

Description of drawings

1 is a perspective view showing the appearance of an inkjet printer including a decurling unit as a paper discharge mechanism according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing the internal structure of the housing of the inkjet printer.

Fig. 3 is a plan view showing the internal structure of the housing of the ink jet printer.

Fig. 4 is a front view showing the internal structure of the housing of the ink jet printer.

Fig. 5 is a schematic view viewed from the left side of the casing, showing the transport path of printing paper.

Fig. 6 is a sectional view viewed from the left side of the casing, showing the structure of the drying unit and the decurling unit.

Fig. 7 is a perspective view seen from the front side of the housing, showing the structure near the paper discharge port.

Fig. 8 is a front view seen from the front side of the casing, showing the structure near the paper discharge port.

Fig. 9 is a side view obtained when the decurling roller is positioned at the nip release position.

Fig. 10 is a side view obtained when the decurling roller is positioned at the transport position.

Fig. 11 is a side view obtained when the decurling roller is positioned at the decurling position.

12 is a perspective view showing the structure of an inkjet printer including a decurling unit according to a second embodiment of the present invention.

Fig. 13 is a plan view showing the structure of an inkjet printer according to a second embodiment.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the description of the following embodiments is basically just an example, and is not intended to limit the present invention, objects to which the present invention is applied, or uses thereof.

first embodiment

FIG. 1 shows the appearance of an inkjet printer A including a decurling unit as a paper discharge mechanism according to the first embodiment, and FIGS. 2 to 5 show the internal structure of the inkjet printer A. As shown in FIG. The inkjet printer A is used in a photo printing system, for example, and prints on printing paper P1 and P2 based on image data transmitted from a receiving block that acquires image data and performs necessary correction processing, etc. via a communication cable. This inkjet printer A is configured to be capable of automatic printing and manual feeding printing, and when automatic printing is performed, one end of the long printing paper P2 that has been rolled into a roll is pulled out and the printing paper P2 (hereinafter referred to as Printing is performed on the printing surface of roll paper P2), and printing is performed on the printing surface (equivalent to the printing surface) of sheet-shaped printing paper P1 (hereinafter referred to as sheet paper P1) that has been cut into a predetermined size when printing by manual feeding. print.

In the following description, when there is no need to distinguish the thin paper P1 and the roll paper P2, the thin paper P1 and the roll paper P2 are referred to as printing papers P1 and P2. In addition, the print surface refers to the surface on which printing is performed, and the print surface of the thin paper P1 is determined when the thin paper P1 is set on the manual feed tray 7 (see FIG. 5 ). Specifically, it is assumed that when the thin paper P1 is set on the manual feed tray 7, the surface facing upward is the printing surface. On the other hand, the printing surface of the roll paper P2 is set such that when the roll paper P2 is rolled, the surface facing outward in the radial direction is the printing surface.

-the whole frame-

As shown in FIGS. 1 to 5, the inkjet printer A includes a printer main body 90, a manual feed tray 7, and a discharge tray 5 as a paper placement portion. The manual feed tray 7 is used to manually set the thin paper P1 The thin paper P1 is supplied into the printer main body 90 , and the discharge tray 5 catches and sets the printing paper P1 and P2 discharged from the printer main body 90 .

The printer main unit 90 includes a casing 6 , a roll paper storage unit 1 , a printing unit 2 (see FIGS. 2 and 5 ), an ink storage unit 3 , and a roller unit 200 . The roll paper storage unit 1 is provided at the lower portion of the casing 6 , and the roll paper P2 rolled into a roll shape with the printing surface facing outward is stored in the roll paper storage unit 1 . The printing unit 2 is provided on the upper part of the housing 6 (upper side than the roll paper storage unit 1), and prints the printed surface of the thin paper P1 supplied from the manual feed tray 7 or from the inside of the roll paper storage unit 1 based on the image data. Printing is performed on the printing surface of the drawn roll paper P2. The ink storage part 3 is located on both sides of the roll paper storage part 1 at the lower part of the casing 6 and is used for storing ink supplied to the printing part 2 . The roller unit 200 is provided on the upper part of the door member 95 installed in the casing 6 in a freely openable and closable manner, and when the door member 95 is in the closed state, the sheet provided on the manual feed tray 7 is conveyed to the printing unit 2 and supplied. Paper P1.

On the upper part of the housing 6 and on the downstream side of the conveying direction than the printing unit 2, a disc-shaped paper cutter (roller cutter) 41, a back printing unit 4, a drying unit U6, a discharge unit U4 and De-frizz unit U7. The disc-shaped paper cutting unit 41 is used to cut off unnecessary parts of the printed printing papers P1 and P2. The back printing unit 4 is used to print a sorting number on the back of the printing paper P1, P2. The drying unit U6 dries the printing papers P1 and P2 printed on the printing unit 2 . The discharge unit U4 sends the printing paper P1 and P2 printed on the printing unit 2 further downstream. The decurling unit U7 performs a decurling process for correcting a curl generated by the roll paper P2 which tends to remain in a wound state. On the downstream side of the decurling unit U7 in the paper conveying direction, a discharge tray 5 is arranged to protrude outward from the paper discharge port 47 of the housing 6 and to receive the The decurling unit U7 discharges the printed papers P1 and P2 and places them.

Hereinafter, in the casing 6, the side of the discharge tray 5 (the discharge side described in FIG. 3 ) is referred to as the front side of the casing, and the side opposite to the discharge tray 5 (the discharge side described in FIG. The provided side) is referred to as the housing rear side, the left side viewed from the housing front side is referred to as the housing left side, and the right side is referred to as the housing right side. Therefore, the left-right direction in FIG. 5 is the front-rear direction of the housing, and the direction perpendicular to the paper surface in FIG. 5 is the left-right direction of the housing. The left-right direction of the case coincides with the width direction of the thin paper P1 provided on the manual feed tray 7 and conveyed, and the width direction of the rolled paper P2 stored in the roll paper storage unit 1 and conveyed.

—Paper Delivery Mechanism—

As shown in FIG. 5 , the inkjet printer A is provided with a paper conveyance mechanism that pulls out the roll paper P2 from the roll paper storage unit 1 and conveys it along a predetermined paper conveyance path. The paper transport mechanism sequentially includes a supply unit U1, a printer unit U2, a paper cutter unit U3, a drying unit U6, a discharge unit U4, and a decurl unit U7 starting from the supply unit U1 that supplies the roll paper P2, so as to form the paper transport path, Image data is printed on the printing surfaces of the printing papers P1 and P2 located on the paper transport path of the printer unit U2 arranged in the printing unit 2 .

As a supplementary note, in this embodiment, that is, the first embodiment, in addition to supplying the roll paper P2 from the supply unit U1 to the printer unit U2, the printer unit U2 also includes a manual paper supply unit U5. The unit U5 is configured to be able to pull in the thin paper P1 from the manual feed tray 7 and convey and supply it to the printing unit 2 .

When printing on the roll paper P2, the paper transport mechanism uses the supply unit U1 to transport and supply the roll paper P2 set in the roll paper storage unit 1 to the printer unit U2. Thereafter, image data is printed by the print head H while conveying the supplied roll paper P2 by the printer unit U2. Afterwards, the printed roll paper P2 is sent to the paper cutter unit U3, and then the roll paper P2 is cut into the specified printing size by the paper cutter unit U3, and then the roll paper P2 is dried by the drying unit U6, while the decurl unit is used U7 is sent to the discharge tray 5 while being decurled. As a supplementary note, in the following description, the upstream side and the downstream side in the conveyance direction when the roll paper P2 is conveyed during printing are simply referred to as the upstream side and the downstream side, respectively.

The supply unit U1 includes a winding core roller 21 , a width limiting roller 22 , a transport driving roller 24 and two pushing contact rollers 25 . The core roller 21 is used to roll the roll paper P2 and store it in the roll paper storage unit 1 . The width regulating roller 22 is used to position the roll paper P2 pulled out from the core roller 21 in the width direction. The transport driving roller 24 is driven by an electric motor not shown to rotate and transport the roll paper P2. The two pushing contact rollers 25 are configured to face the conveying driving roller 24, and push and contact the conveying driving roller 24 so as to clamp between the two pushing contact rollers 25 and the conveying driving roller 24. Roll paper P2.

The supply unit U1 is configured to pull out the roll paper P2 from the roll paper storage unit 1 and transport it to the printing unit 2 side by driving the transport driving roller 24 to rotate.

The conveying driving roller 24 is configured to be able to rotate forward and reversely by an electric motor not shown, and when the forward rotation is performed, the conveying driving roller 24 pulls the roll paper P2 out of the roll paper storage unit 1 . And convey to the side of the printing unit 2 , and when the reverse rotation, the conveying drive roller 24 makes the roll paper P2 return to the roll paper storage unit 1 .

In this way, after the paper cutting unit U3 on the downstream side of the printing unit 2 cuts the printed part of the roll paper P2 to a predetermined size, or the cut roll paper P2 can be returned to the upstream side, and then Printing is performed from the front end of the roll paper P2, or the cut roll paper P2 can be returned to the roll paper storage unit 1, and the cut sheet-shaped thin paper P1 is supplied to the printing unit 2 by the manual paper supply unit U5. and print. In addition, when the roll paper P2 is replaced with a new roll paper P2, the roll paper P2 pulled outside the roll paper storage unit 1 can be returned to the inside of the roll paper storage unit 1 .

The printer unit U2 includes a print head H, a paper holding portion D, and a push-contact printing transport roller 33 . The print head H ejects ink onto the printing paper P1 and P2 to form an image. The paper holding portion D holds the printing paper P1 and P2 at a position where printing can be performed by the print head H by suction. The push-contact type print transport roller 33 is arranged on the downstream side of the paper holding portion D. As shown in FIG. As a supplementary note, the transport drive roller 24 and the push contact roller 25 of the supply unit U1 are also used for the printer unit U2, and play the role of transporting the printing paper P1, P2 in the printer unit U2.

The print head H is configured to be movable along a rail 30 extending along the main scanning direction X (see FIG. 3 ) that coincides with the width direction of the printing papers P1 and P2 (housing left-right direction). Specifically, the rotational force of the driving motor 32 is transmitted to the driving belt 31 through a pulley, and the print head H moves in the main scanning direction X according to the rotation amount of the driving belt 31 .

In addition, the print head H has two head units 38 (refer to FIG. 5 ) arranged along a sub-scanning direction Y (refer to FIG. 3 ), which is perpendicular to the main scanning direction X and parallel to the moving direction of the printing papers P1 and P2. (The front and rear directions of the shell) are the same. The print head H is capable of printing predetermined images, characters, and the like on the print paper P1 and P2 by ejecting ink from ink nozzles (not shown) provided in the two head units 38 .

The printing papers P1 and P2 are conveyed intermittently (stepwise) in the sub-scanning direction Y by the conveyance drive roller 24 , the press touch roller 25 and the printing conveyance roller 33 at a constant unit conveyance amount. When the printing papers P1 and P2 are stopped each time during the intermittent conveyance, the print head H performs one scan in the main scanning direction X (performs one forward movement or one backward movement in reciprocation). During this scanning, ink is simultaneously ejected from the ink nozzles of the head units 38 to the printing surfaces (upper surfaces) of the printing papers P1 and P2 at respective positions in the main scanning direction X. That is, after the printing head H performs one scan, the printing paper P1 and P2 are transported by the unit transport amount, and then the printing head H is again scanned once, and the above operation is repeated to print a desired image.

The ink reservoirs 3 on both sides include box-shaped cases (cases) 61 (see FIG. 4 ) arranged on the left and right sides of the inkjet printer A, and are housed in the respective cases 61 so as to be attachable and detachable. There are seven ink cartridges 62 (in FIG. 4 , three ink cartridges 62 are stored on the left side and four ink cartridges 62 are stored on the right side) that seal inks of different hues. Therefore, by installing or removing these ink cartridges 62 in the box 61 , it is possible to replace the ink cartridges 62 being used or exhausted with new ink cartridges 62 . As an additional explanation, these ink cartridges 62 respectively seal the following various inks: yellow (Y: yellow), magenta (M: magenta), cyan (C: cyan), black (K: black), red (R: red ), purple (V: violet) and transparent (CL: clear).

The paper cutter unit U3 is configured to include a disk-shaped paper cutter 41, and the disk-shaped paper cutter 41 is rotated to move in the width direction at a predetermined position in the length direction of the printing paper P1, P2. , to cut the printing paper P1, P2 into a predetermined size (length).

A torn paper scrap collection box 65 for collecting scraps of the printing paper P1 and P2 generated by cutting is disposed below the disc-shaped paper cutting unit 41 . The cut paper scrap collection box 65 is configured as follows: the worker can hold the handle 66 to slide the cut paper scrap collection box 65 to the front side of the housing, and take out the cut paper scrap collection box 65 to the outside of the housing 6. The scraps stored in the cut paper scrap collection box 65 are discarded.

In addition, the printing papers P1 and P2 cut by the paper cutting unit U3 are sent to the discharge unit U4 by the push contact conveying roller 43 . As an additional note, a rear printing unit 4 is disposed between the paper cutting unit U3 and the discharge unit U4. In this backside printing unit 4, a sorting number or the like is printed on the backside (lower surface) of the printing paper P1, P2 passing through this portion.

The discharge unit U4 has two sets of push-contact discharge rollers 45, 46, and the two sets of push-contact discharge rollers 45, 46 are used to convey the printing papers P1, P2 and discharge them to the decurling unit U7.

Here, the transport roller 43 and the discharge rollers 45 and 46 are driven by an electric motor not shown to rotate in synchronization with each other. Also, the conveying roller 81 and the decurling roller 82 of the decurling unit U7 described later are driven by the electric motor to rotate synchronously with the conveying roller 43 and the discharge rollers 45 and 46 . As an additional note, it is not necessary to drive both the transport roller 81 and the decurling roller 82 to rotate. Alternatively, only one of the two rollers (preferably, the transport roller 81 ) may be driven to rotate.

In addition, the conveying roller 43 and the discharge rollers 45 and 46 are set so that they are sandwiched between the leading ends of the printing paper P1 and P2 conveyed by the conveying driving roller 24 and printing conveying roller 33 on the upstream side. Between the roller 43 and the discharge rollers 45 and 46, the pressing contact between the roller and the roller is released.

Specifically, when the printing paper P1, P2 is conveyed from the conveying driving roller 24 and the print conveying roller 33 to the conveying roller 43, before the front end portion of the printing paper P1, P2 touches the conveying roller 43, the The roller on the upper side moves upward, and the pushing contact between the roller and the roller is released. Similarly, when the printing paper P1, P2 that has passed the conveying roller 43 is conveyed toward the discharge rollers 45, 46, before the front end portions of the printing paper P1, P2 contact the discharge rollers 45, 46, respectively, the paper on the upper side The rollers are moved upward, and the rollers are released from pressing contact with each other. This solves the problem that the front end of the printing paper P1, P2 is caught on the transport roller 43 or the discharge rollers 45, 46, causing the printing paper P1, P2 to bend.

In addition, after the image is printed by the printer unit U2, before the printing paper P1, P2 is cut by the paper cutter unit U3, the upper rollers of the conveying roller 43 and the discharge rollers 45, 46 that have moved upward are simultaneously returned to the upper side. to the pushing contact position, so as to clamp the printing paper P1, P2. In this way, the printing papers P1 and P2 will not be shifted when the paper is cut, and can be cut accurately.

As shown in FIG. 6 , the drying unit U6 is arranged between the two sets of push contact type discharge rollers of the discharge unit U4, that is, the upstream side and the downstream side discharge rollers 45 and 46, and the air is blown from the The suction port 48 near the upper side of the paper discharge port 47 is sucked into the housing 6, the sucked air is heated, and the heated air is blown as dry air.

The drying unit U6 includes a drying chamber 71 , a drying device 72 and an external cover (cover) 70 . The drying chamber 71 is provided on the paper transport path of the printing paper P1, P2. The drying device 72 sends drying air to the drying chamber 71 . The outer cover 70 guides the air sucked in from the suction port 48 into the drying device 72 . The drying chamber 71 is defined by an upper partition wall 71a and a lower partition wall 71b facing each other across the printing papers P1, P2, and constitutes a stagnation space where the drying air blown from the drying device 72 toward the printing papers P1, P2 stays.

The drying device 72 includes a suction fan 73 , a heating unit 74 and an exhaust nozzle unit 75 . In order to suck air from the outside into the drying device 72 through the suction port 48 of the housing 6 , a plurality of the suction fans 73 are provided at intervals in the left-right direction of the housing 6 . The heating unit 74 heats the air sucked in by the suction fan 73 . The exhaust nozzle portion 75 is provided at the lower end portion of the drying device 72 , and blows the drying air heated by the heating portion 74 toward the printing papers P1 and P2 . The exhaust nozzle portion 75 opens downward and downstream in the paper conveying direction, and blows the drying air downward and downstream in the paper conveying direction. The drying air dries the ink adhering to the printing surfaces of the printing papers P1 and P2 in the printing unit 2 .

The outer cover 70 is provided at a position above the paper discharge port 47 of the casing 6, and is used to circulate the air sucked in from the suction port 48 of the casing 6 into the circulation space 76 inside the outer cover 70, and This air is directed to a suction fan 73 . An openable and closable rear door 77 is provided on the surface of the exterior cover 70 . By providing such a drying unit U6, even if the ink sprayed by the printing head H onto the printing paper P1, P2 has not yet dried, the drying air can be used to promote drying of the ink.

—Curl removal unit—

Next, the structure of the decurling unit U7 will be described. As shown in FIG. 6 , the decurling unit U7 (a roller pair composed of a conveying roller 81 and a decurling roller 82 described later) is installed at a position where the casing 6 of the printer main body 90 is installed. The end portion of the paper conveying path inside and the position near the paper discharge port 47 in the casing 6 (on the downstream side from the drying device 72 ). The decurling unit U7 discharges the printing papers P1 and P2 transported to the end portion to the discharge tray 5 from the end portion through the paper discharge port 47 of the housing 6 . The discharge tray 5 is arranged at a lower height than the end portion of the paper conveyance path (paper discharge port 47 ), and there is a height difference between the discharge tray 5 and the end portion of the paper conveyance path.

The decurling unit U7 also has a function of performing decurling processing for correcting curls (curls bent so that the back side of the roll paper P2 is inward) that the roll paper P2 tends to remain wound. This decurling unit U7 includes a pair of rollers and a position changing member 83 . This roller pair is constituted by a conveying roller 81 (corresponding to a first roller) and a decurling roller 82 (corresponding to a second roller) configured to be movable around the conveying roller 81 . This position changing member 83 changes the relative position of the decurling roller 82 with respect to the conveyance roller 81 . In addition, a free roller 80 that rotates in conjunction with the movement of the printing paper P1 and P2 being conveyed is arranged on the upstream side of the conveying roller 81 .

As shown in FIGS. 7 and 8 , the transport roller 81 is composed of a roller shaft 81 a and a plurality of roller portions 81 b, 81 b, . . . . The roller shaft 81a extends in the width direction of the printing paper P1, P2, and the plurality of roller parts 81b, 81b, ... are arranged in the axial direction of the roller shaft 81a with a space therebetween.

A guide member 92 is arranged downstream of the transport roller 81 . The guide member 92 is used to guide the printing paper P1, P2 so that the rear end of the printing paper P1, P2 discharged from the conveying roller 81 to the discharge tray 5 side is not rolled into the conveying roller 81 side, while the printing paper P1 and P2 are printed. The papers P1 , P2 are sent to the discharge tray 5 smoothly. The guide member 92 includes a pair of left and right guide plates 92b, 92b and protrusions 92a, 92a, . . . . The guide plates 92b, 92b extend in the axial direction of the conveyance roller 81 so as to cover the lower edge portion of the conveyance roller 81, and guide the printing paper P1, P2 to the discharge tray 5 side. The protruding parts 92a, 92a, ... are protrudingly provided on the upper side edge part of the guide plate 92b corresponding to the positions between the roller parts 81b, 81b, ... to guide the printing paper P1, P2, so as not to The rear end portions of the printing papers P1, P2 are wound between the transport rollers 81b, 81b, . . .

The outer diameter of the decurling roller 82 is smaller than the outer diameter of the conveying roller 81, and the decurling roller 82 extends in a continuous manner along the width direction of the printing paper P1, P2, and is arranged so as to be able to roughly follow the direction of the conveying roller 81. The roller surface (outer peripheral surface of the roller portion 81b) moves. As will be described later, a decurling position, a transport position, and a nip release position are set on the moving path of the decurling roller 82 , and the decurling roller 82 changes its position among the plurality of positions.

Specifically, the shaft end portion of the decurling roller 82 is attached so as to be rotatable with respect to a rotating member (lever) 84 . The rotating member 84 includes a mounting portion 84a and a contact portion 84b. Seen from the axial direction of the roller shaft 81a (the width direction of the printing papers P1 and P2 ), the mounting portion 84a has a substantially C-shape surrounding the upstream portion of the transport roller 81 . The contact portion 84b extends obliquely downward on the upstream side from the lower portion on the upstream side of the attachment portion 84a. The decurling roller 82 is rotatably attached to an upper front end portion of the substantially C-shaped attachment portion 84a, and a rotating member shaft 85 is attached to a lower front end portion. The rotating member 84 is configured to move the decurling roller 82 in an arc shape substantially along the roller surface of the transport roller 81 by rotating the rotating member 84 about the rotating member shaft 85 .

In addition, on the rotating member 84, a push spring 86 is arranged across the contact portion 84b and the mounting bracket 91 disposed on the upstream side of the free roller 80, and the pushing spring 86 pushes the rotating member 84 along the direction of the drawing. 6 in the counterclockwise direction to fix the decurling roller 82 on the clamp release position described later.

The position changing member 83 is disposed on the upstream side of the rotating member 84 . The position changing member 83 presses the contact portion 84 b while being in contact with the contact portion 84 b to rotate the rotating member 84 clockwise against the urging force of the urging spring 86 . The position changing member 83 includes a main body portion 83a and a roller portion 83b. The main body portion 83a is rotatable around a rotation shaft 83c extending in the width direction of the printing paper P1, P2. The roller portion 83b is rotatably attached to the upper end portion of the main body portion 83a, and is in contact with the contact portion 84b. A pulse motor, not shown, rotates the main body portion 83a around the rotation shaft 83c.

The position changing member 83 changes the rotation angle of the position changing member 83 while bringing the roller portion 83b of the position changing member 83 into contact with the contact portion 84b of the rotating member 84, thereby changing the position of the decurling roller 82 relative to the transport roller 81. relative position.

More specifically, as shown in FIG. The left end position (the position closest to the downstream side) is the clamp release position. In this nip release position, the decurl roller 82 has moved away from the paper conveyance path to the side (upper side) opposite to the conveyance roller 81, and a predetermined gap H is provided between the conveyance roller 81 and the decurl roller 82. (The gap H is larger than the thickness of the printing paper P1, P2), and the clamping of the printing paper P1, P2 is released (pressing contact). In this way, the printing papers P1 and P2 cannot be conveyed at the clamp release position. In addition, at the nip release position, the rotation axis of the decurling roller 82 is located closer to the paper discharge side (downstream side) than the rotation axis of the transport roller 81 . In addition, the detection piece 87 is attached to the main body part 83a of the position changing member 83. As shown in FIG. When the detection piece 87 is shifted to the left from the transmission sensor 88 as shown in FIG. 9 , it is detected that the decurling roller 82 is fixed at the nip release position.

By adopting the above configuration, the pinching of the printing papers P1 and P2 by the transport roller 81 and the decurling roller 82 is released. For example, when the conveyance of paper is temporarily stopped due to intermittent conveyance when forming an image, the curl is released by moving the decurl roller 82 during the decurl process from a decurl position described later to a nip release position. The eraser roller 82 pushes the roll paper P2. In this way, the problem that the pressing marks of the decurling roller 82 remain on the roll paper P2 can be solved. Therefore, it is possible to prevent the printing quality from deteriorating due to the pressing marks.

Next, as shown in FIG. 10 , by rotating the main body portion 83a of the position changing member 83 in the counterclockwise direction, the roller portion 83b is brought into contact with the contact portion 84b of the rotating member 84, and the contact portion 84b is pushed to the transparent position. until the detection piece 87 is detected by the type sensor 88, the rotating member 84 is rotated clockwise against the urging force of the urging spring 86, the decurling roller 82 is fixed so that the decurling process cannot be performed, and the sheet paper P1 is conveyed. on the delivery location. At this transport position, the sheet of paper P1 is ejected to the discharge tray 5 by nipping the transport roller 81 and the decurling roller 82 and driving the transport roller 81 and the decurling roller 82 to rotate. In addition, at the conveying position, the decurling roller 82 is disposed slightly upstream of the conveying roller 81 . That is, the rotational axis of the transport roller 81 is located closer to the paper discharge side than the rotational axis of the decurling roller 82 . In addition, at this conveyance position, the thin paper P1 does not bend along the roller surface of the decurling roller 82 . Also, even if the roll paper P2 is transported at this transport position, the curl of the roll paper P2 cannot be corrected because the roll paper P2 does not bend along the roller surface of the decurling roller 82 .

Since the decurling roller 82 is arranged slightly upstream of the conveying roller 81, it is different from arranging the conveying roller 81 and the decurling roller 82 in a direction perpendicular to the paper conveying direction. Compared with the case, a larger gap is provided between the two rollers 81, 82 (however, the gap is smaller than the thickness of the thin paper P1). In this way, the pressing contact force applied to the thin paper P1 can be weakened, thereby reducing the load on the thin paper P1. That is, since the sheet P1 is conveyed in a state where the sheet P1 is bent a little, even if the pressing contact force is weakened, the restoring force of the sheet P1 to be stretched straight and the relationship between the sheet P1 and the two rollers can be used. The frictional force between 81, 82 enables a smooth, smooth transport utilizing the elasticity of the thin paper P1.

It should be added that at the conveying position, although the gap between the two rollers 81, 82 is smaller than the thickness of the thin paper P1, when the two rollers 81, 82 clamp the thin paper P1, the two rollers will Of the 81, 82, at least the roller surface of the conveying roller 81 is deformed, so that the size of the gap between the two rollers 81, 82 is equal to the thickness of the sheet paper P1.

As shown in FIG. 11 , by further rotating the main body portion 83 a of the position changing member 83 in the counterclockwise direction, the roller portion 83 b is pressed to the contact portion 84 b of the rotating member 84 to the detection piece 87 from the transmissive sensor 88 to the right side. The decurling roller 82 is fixed at the decurling position where the decurling process can be performed and the roll paper P2 is conveyed by shifting to a position where it is not detected. In this decurling position, the rotational axis of the decurling roller 82 is located on the upstream side of the rotational axis of the transport roller 81, and the decurling roller 82 moves to the side of the transport roller 81 relative to the paper transport path. (lower side) position. In this way, the decurling roller 82 pushes the roll paper P2 downward, and bends the roll paper P2 along the roll surface of the decurling roller 82 so that the printing surface side is inward, thereby performing decurling processing. In addition, the roll paper P2 is discharged to the discharge tray 5 by driving the roll paper P2 between the conveyance roller 81 and the decurling roller 82 and driving the two rollers 81 and 82 to rotate, as in the above-mentioned conveyance position. In this decurl position, the rotation axis of the transport roller 81 is located closer to the paper discharge side than the rotation axis of the decurl roller 82, as in the transport position. , the distance between the two axes of rotation, measured in the direction of transport, is greater.

Here, the gap between the decurling roller 82 and the conveying roller 81 when the decurling roller 82 is at the decurling position is set to be wider than the gap when the decurling roller 82 is at the conveying position. Specifically, the gap between the decurl roller 82 and the delivery roller 81 is set to be larger than the thickness of the roll paper P2 when the decurl roller 82 is at the decurl position; In this position, the gap is smaller than the thickness of the roll paper P2 (and the thickness of the thin paper P1).

In this way, by gradually changing the gap when the decurl roller 82 is moved from the transport position to the decurl position, it is possible to suppress the rapid action of the strong pressing force on the restoring force to straighten the roll paper P2. , to minimize the damage to roll paper P2.

The decurling positions are set at a plurality of positions (in FIG. 11, respectively indicated by long dashed double-short dashed lines) that exist substantially along the roller surface of the conveying roller 81. In the example shown in FIG. 11, a strong position, a weak position, and a weakest position are set with the position of the decurling roller 82 shown by a solid line as a reference decurling position. The strong position is a position where the decurling force (pressing force of the decurling roller 82 on the roll paper P2 ) is relatively strong when the decurling roller 82 is rotated clockwise from the reference decurling position. The weak position is a position where the decurling force is relatively weak, which is reached by rotating the decurling roller 82 counterclockwise from the reference decurling position. The weakest position is a position where the decurling force is the weakest, reached by further rotating the decurling roller 82 in the counterclockwise direction from the weak position. The position changing member 83 adjusts the strength of the decurling force applied to the roll paper P2 by moving the decurling roller 82 from the weakest position to the strong position.

With such a configuration, it is possible to apply an appropriate decurling force to the roll paper P2 in accordance with the curl shape. Specifically, in the vicinity of the inner peripheral portion of the rolled paper P2, the curvature radius of this portion is relatively small, so the curl is relatively strong, and in the outer peripheral portion, because the curvature radius is relatively large, the curl is not strong. sharp. Therefore, by adjusting the strength of the decurling force according to the paper consumption of the roll paper P2 stored in the roll paper storage unit 1, the curl of the roll paper P2 can be corrected with the optimum decurling force. That is to say, in the early stage of use, it is judged that the curl is weak, and the decurl roller 82 is set to the weakest position, and in the middle stage, the decurl roller 82 is set to the weak position, and in the later stage, the decurl roller 82 is set to the weakest position. The strong position.

In addition, it is also possible to set the decurling force applied to the roll paper P2 to be greater than the length when the length of the roll paper P2 cut into a predetermined length by the paper cutter unit U3 is greater than a predetermined value. The decurling force is strong when it is less than the specified value. In other words, it is judged that if the length of the roll paper P2 is relatively long, it is relatively easy to bend, so that the curl is relatively strong. Therefore, in this case, the decurling force is set to be relatively strong. Alternatively, the decurling force applied to the roll paper P2 may be set to be stronger as the length of the roll paper P2 is longer.

Furthermore, the decurling force applied to the roll paper P2 can also be adjusted according to the material properties of the roll paper P2. Appropriate decurl force that can easily correct the curl is applied to the roll paper P2 according to the material properties.

In addition, it is also possible to store the manufacturing date information of the roll paper P2 in a storage unit such as an integrated circuit chip provided in the core of the roll paper P2 in advance, and then read out the manufacturing date information, according to The strength of the decurling force applied to the roll paper P2 is adjusted according to the elapsed time from the date of manufacture of the roll paper P2. In other words, it is only necessary to set such that the roll paper P2 is judged to be curled when the date of manufacture is read from the storage unit of the roll paper P2 and the elapsed period from the date of manufacture exceeds a predetermined period. stronger, so a stronger decurling force is set in this case.

In this embodiment, that is, the first embodiment, the decurl position or the transport position corresponds to the first position on the moving path of the decurling roller 82, and the nip releasing position corresponds to the first position on the moving path of the decurling roller 82. The second position is a position closer to the paper discharge side than the first position. Further, the position changing member 83 and the rotating member 84 constitute a roller position switching mechanism for switching the position of the decurling roller 82 to any one of the first position and the second position.

As shown in FIG. 6, on the lower surface of the lower partition wall 71b of the drying chamber 71 constituting the drying unit U6, the front end and the rear end of the detection printing paper P1 and P2 are arranged on the downstream side. The detection sensor 93. When the front end of the printing paper P1, P2 is detected by the detection sensor 93, the printing paper P1, P2 is conveyed for a predetermined length from the detected time, and when the front end of the printing paper P1, P2 is located at the corresponding When the transport roller 81 is in position, the decurling roller 82 of the decurling unit U7 is moved from the nip release position to the decurl position or the transport position. In other words, the decurl roller 82 is on standby at the nip release position as described later, so that when the printing paper P1, P2 is delivered from the discharge unit U4 to the decurl unit U7, the decurl roller 81 and the decurler can be used. The erasing roller 82 smoothly nips the printing papers P1, P2. This solves the problem that the front end of the printing paper P1, P2 is caught on the transport roller 81 or the decurling roller 82, and the printing paper P1, P2 is bent.

In addition, in the case where the detection sensor 93 detects the rear end of the printing paper P1, P2, the printing paper P1, P2 is conveyed for a predetermined length from the detected time, and then when the rear end of the printing paper P1, P2 is When the end portion is positioned between the free roller 80 and the conveying roller 81, the decurling roller 82 of the decurling unit U7 is moved from the decurling position or the conveying position to the clamp releasing position. That is, when the printing paper P1, P2 is discharged to the discharge tray 5 by the conveying roller 81 and the decurling roller 82 positioned at the decurling position or the conveying position, the trailing end portion of the printing paper P1, P2 is discharged. When it reaches the discharge tray 5, the position of the decurl roller 82 is switched from the decurl position or the transport position to the nip release position.

In this way, the rear end portions of the printing papers P1 and P2 move toward the discharge tray 5 side at a time in conjunction with the movement of the decurling roller 82 from the decurling position or the transport position to the nip releasing position. Therefore, the discharge speed of the printing papers P1 and P2 is relatively fast, so that the printing papers P1 and P2 can be smoothly discharged to the discharge tray 5, and the placement position of the printing papers P1 and P2 on the discharge tray 5 is stable. That is, since there is a height difference between the discharge tray 5 and the end portion (paper discharge port 47) of the paper conveyance path, the front ends of the printing paper P1, P2 hang down due to gravity, and then the upper surface of the discharge tray 5 or already The printing paper P1, P2 placed on the upper surface is discharged while sliding on the upper surface, and after the rear end portion of the printing paper P1, P2 is discharged, due to the frictional resistance acting on the front end of the printing paper P1, P2 , the paper stop position, that is, the paper placement position is unstable. However, by setting the ejection speed at the time of ejecting the trailing end portions of the printing papers P1 and P2 to be relatively fast as described above, the paper placement position can be stabilized. On the other hand, by setting the discharge speed at a relatively slow speed when discharging parts other than the rear end parts of the printing paper P1, P2, it is possible to use the drying device 72 of the drying unit U6 to make the printing paper P1, P2 attached to the printing paper P1, P2 The ink on the printing surface is definitely dried. When the discharge of the printing paper P1, P2 is completed, because the decurling roller 82 is located at the nip release position, it is only necessary to keep this state and wait until the front end of the next printing paper P1, P2 is sent. It is necessary to deliberately move the decurling roller 82 to the nip release position when the next printing paper P1, P2 is transferred.

Furthermore, when the rear end portion of the printing paper P1, P2 is located between the free roller 80 and the conveying roller 81, that is to say, when the decurling roller 82 at the decurling position or the conveying position is sent to the discharge tray 5 In the process of discharging the printing paper P1, P2, when the rear end portion of the printing paper P1, P2 is discharged to the discharge tray 5, in addition to moving the decurling roller 82 to the nip release position, the conveying roller is driven faster. 81 and the rotation speed of the electric motor of the decurling roller 82, so that the driving rotation speed of the conveying roller 81 and the decurling roller 82 is changed to a faster speed. In this way, the placement positions of the printing papers P1 and P2 on the discharge tray 5 are more stable.

In addition, since the decurling unit U7 is arranged on the downstream side of the drying device 72 to decurl the roll paper P2 immediately after being dried by the drying device 72, it is necessary to properly straighten the roll paper. The curl aspect of P2 is good. That is to say, since the roll paper P2 heated by the drying wind of the drying device 72 is in a state of being very easily deformed, if the roll paper P2 in this state is decurled by the decurl unit U7, it will be different from the unpaired roll paper P2. Compared with the case of heating, a higher effect of eliminating curl can be obtained.

As described above, when the rolled paper P2 is conveyed, the decurling unit U7 corrects the curl of the rolled paper P2 by moving the decurling roller 82 to the decurling position and performing decurling processing. On the other hand, when conveying a thin sheet of thin paper P1, the decurling unit U7 moves the decurling roller 82 to the conveying position, and conveys the sheet to the discharge tray 5 without performing decurling processing. Paper P1. Therefore, the decurling unit U7 switches whether to perform decurling according to the type of the printing paper P1 and P2 to be transported, so that the uncurled thin paper P1 will not be decurled to produce curls, and it can appropriately handle rolls and sheets. Printing paper P1, P2.

In addition, when the rear end portion of the printing paper P1, P2 is discharged to the discharge tray 5, by switching the position of the decurl roller 82 of the decurl unit U7 from the decurl position or the transport position to the nip release position, the decurl position in the discharge direction is adjusted. Increase the speed of printing paper P1, P2. Therefore, it is possible to stabilize the placement positions of the printing papers P1 and P2 on the discharge tray 5 .

second embodiment

Fig. 12 is a perspective view showing the structure of an inkjet printer according to a second embodiment. The difference between the second embodiment and the first embodiment is that in the second embodiment, a transport unit 100 and an accumulation unit 110 are provided instead of the discharge tray 5 . Therefore, in the following, the same parts as those of the first embodiment will be denoted by the same symbols, and only the different items will be described.

As shown in FIGS. 12 and 13 , this inkjet printer A includes a printer main body 90 , a transport unit 100 and an accumulation unit 110 . The transport unit 100 is arranged on the downstream side of the printer body 90 . The storage unit 110 is arranged on the downstream side of the transport unit 100 in the transport direction of the transport unit 100 . As a supplementary note, the printer main body 90 has substantially the same configuration as the printer main body 90 described in the first embodiment, and the description of the printer main body 90 in this embodiment will be omitted.

The conveying unit 100 constitutes a paper setting unit that catches and sets the printing paper P1 and P2 discharged from the paper discharge port 47 of the casing 6 of the printer main body 90 . The conveying unit 100 includes a conveying belt 101 , driving rollers 102 and large-size discs 104 . The conveying belt 101 conveys the set printing papers P1 and P2 downstream in a conveying manner. The drive roller 102 drives the conveyor belt 101 . The large-size disk 104 is arranged on the upstream side in the conveying direction from the conveying belt 101 . As an additional note, it is defined as: the downstream side of the conveying direction of the conveying unit 100 refers to the direction toward the right side of the casing (the storage unit 110 side).

The position corresponding to the paper discharge port 47 of the casing 6 in the conveying belt 101 is set as a placement area R (strictly speaking, the placement area R is equivalent to a paper placement portion), and the passing paper discharge is received in the placement area R. The exit 47 discharges the printing papers P1 and P2 immediately after. Like the discharge tray 5 in the first embodiment, the placement area R in the conveyance belt 101 is also arranged at the end of the paper conveyance path (the paper discharge port 47 ) at a low height position. The conveying unit 100 drives and controls the conveying belt 101 in such a manner that before the next printing paper P1, P2 discharged through the paper discharge port 47 of the housing 6 is placed in the placing area R, the placed printing paper P1 and P2 leave the placement area R.

In this way, the printing papers P1 and P2 do not overlap on the transport belt 101 . Therefore, it is possible to suppress problems such as uneven color tone of the printed image, which occurs due to non-uniform drying of the ink on the printing paper P1, P2.

It should be added that the driving control of the conveying belt 101 is performed by adjusting the conveying speed so that when the placed printing papers P1 and P2 leave the placement area R, the next printing paper P1 is discharged. , P2. In addition, an intermittent conveying method may also be adopted, that is, instead of driving the conveying belt 101 at a constant speed, the placed printing papers P1 and P2 are conveyed at one go when the next printing paper P1 and P2 is conveyed. to the outside of drop zone R.

Here, when printing paper P1 and P2 of a normal photo size such as 3R are placed on the conveying belt 101, the conveying unit 100 is driven and controlled so that the conveying unit 100 is disposed on the downstream side in the conveying direction. The accumulating unit 110 transports the printing paper P1, P2, and when the printing paper P1, P2 with a large size is placed, the transport unit 100 is driven and controlled so that the transport unit 100 is arranged upstream in the transport direction. The large-size tray 104 on one side conveys the printing papers P1 and P2. In the case where the transport direction is switched according to the size of the printing paper P1, P2 as described above, the printing paper P1, P2 can be transported to an appropriate storage position according to each paper size.

The storage unit 110 is arranged on the downstream side of the transport unit 100 in the transport direction from the transport unit 100 , and is used to store the printing papers P1 and P2 sent from the transport unit 100 . The accumulation unit 110 includes an accumulation main body 111 , an accumulation plate 112 and an accumulation belt 113 . The accumulating plate 112 is provided in the accumulating main body portion 111 , and the printing papers P1 and P2 conveyed from the conveying unit 100 are placed on the accumulating plate 112 . The accumulation belt 113 transports the plurality of accumulation boards 112 arranged with a mutual interval to the rear side of the housing in a conveyor belt manner.

At the position where the printing paper P1 and P2 are delivered and received on the downstream side of the conveyor belt 101 , the storage plate 112 is in a state where the plate surface is horizontal and substantially flush with the belt surface of the conveyor belt 101 . standby. After accumulating the number of sheets corresponding to a specified batch of print order content, before starting to transport the printing paper P1 and P2 of the next batch of order content, the storage board 112 on standby is transported to the rear of the housing by the storage belt 113 side. The plate surface of the storage plate 112 supported in a horizontal state is erected during conveyance by the storage belt 113 and functions as a partition for separating the printing papers P1 and P2 of each order content from each other.

Here, the conveying unit 100 drives and controls the conveying belt 101 in such a manner that when the printing papers P1 and P2 are transferred from the conveying belt 101 to the accumulation plate 112 of the accumulation unit 110, the conveyance of the printing papers P1 and P2 The speed is a speed equal to or higher than a predetermined speed. Specifically, since there is a gap between the conveying belt 101 and the accumulation plate 112, if the conveying speed of the conveying belt 101 is too slow, the edge portions of the ends of the printing paper P1 and P2 will be trapped in the gap, and the paper cannot be printed. There is no risk of a smooth transfer or transfer in itself. Therefore, the conveying speed of the conveying belt 101 is controlled to be higher than the speed at which the printing papers P1 and P2 can be stably transferred, so that the printing papers P1 and P2 can be reliably transferred.

By separating the printed papers P1 and P2 of the ordered batches from each other by the accumulation plate 112 as described above, the printed papers P1 and P2 of the ordered batches can be easily separated and sorted. In addition, since the number of stored printing papers P1 and P2 can be increased, the number of times a worker takes out the printing papers P1 and P2 after printing images can be reduced to a small number, thereby improving work efficiency.

As in the first embodiment, in this embodiment, that is, in the second embodiment, the decurling unit U7 is arranged at the end of the paper conveying path in the housing 6 of the printer main body 90 (by the conveying rollers). 81 and decurling roller 82), the decurling unit U7 discharges the printing paper P1, P2 to the placement area R in the conveying belt 101 through the paper discharge port 47 of the casing 6. In the case where the paper placement portion is the conveyance belt 101 as described above, the height difference between the paper placement portion and the end portion of the paper conveyance path (paper discharge port 47) is generally larger than in the case of using the discharge tray 5, Therefore, the frictional resistance acting on the front ends of the printing papers P1 and P2 is greater, making the placement positions of the printing papers P1 and P2 prone to deviation. However, as in the first embodiment, in the present embodiment, that is, the second embodiment, when the rear end portions of the printing papers P1, P2 are positioned between the free roller 80 and the transport roller 81, the decurl unit U7 decurls The decurl roller 82 also moves from the decurl position or the transport position to the nip release position, and the driving rotation speed of the transport roller 81 and the decurl roller 82 also becomes faster. In this way, the speed of the printing papers P1 and P2 in the discharge direction can be increased, so that the placement positions of the printing papers P1 and P2 on the placement area R can be stabilized. As a result, transfer of the printing paper P1 and P2 from the conveyor belt 101 to the accumulation plate 112 of the accumulation unit 110 can be reliably performed.

As a supplementary note, in each of the above-described embodiments, the second position is defined as a nip release position where the printing paper P1 and P2 are released from being sandwiched by the transport roller 81 and the decurling roller 82 . However, as long as it is located closer to the paper discharge side than the first position and can accelerate the speed of the printing paper P1, P2 in the discharge direction by moving the decurl roller 82 from the first position to the second position , the second position may be set at any position, and the second position may also be a position where the printing paper P1 and P2 can be sandwiched and transported.

In addition, the positional relationship between the rotation axes of the first and second rollers at the first and second positions is not limited to the positional relationship in the respective embodiments described above.

Furthermore, it is not necessarily necessary to increase the driving rotational speed of the conveying roller 81 and the decurling roller 82 when the rear end portion of the printing paper P1, P2 is located between the free roller 80 and the conveying roller 81 .

Furthermore, the present invention is not limited to the paper discharge mechanism disposed at the end of the paper conveyance path provided in the printer main body 90 of the inkjet printer A, and can be applied to a paper discharge mechanism that is provided with a paper conveyance path. A paper discharge mechanism that discharges paper to the outside of the device in the device. In addition, the present invention is not limited to a paper discharge mechanism that discharges paper to the outside of the device, for example, it can also be used in a paper discharge mechanism that is arranged at a ratio from the end of the paper conveyance path of the first processing unit inside the device. The paper discharge mechanism that discharges the paper from the paper placement section of the second processing section at a lower height position of the end portion.

Claims (4)

1. paper output mechanism is arranged on the dwell section in sheet conveying path, and the paper that is transported to this dwell section is discharged to the paper placement section that is configured on the height and position lower than this dwell section from this dwell section, it is characterized in that:

Described paper output mechanism comprises:

The roller antithetical phrase, by first roller and constitute and to constitute around second roller that this first roller moves, when this second roller is positioned on the primary importance on the mobile route of this second roller, by clamping described paper with this first roller and this second roller, and at least one roller that drives in this first roller and this second roller with actuator is rotated, come to described paper placement section discharge this paper and

Roller position switching mechanism, the position of between the described primary importance and the second place, switching described second roller, this second place is in also discharging on the position of a side near paper than this primary importance on the mobile route of this second roller;

Described roller position switching mechanism constitutes: with described first roller and be arranged in described second roller on the described primary importance is discharged process from described paper to described paper placement section, when when this paper placement section is discharged the rear end part of this paper, the position of described second roller is switched to the described second place from described primary importance.

2. paper output mechanism according to claim 1 is characterized in that:

Described primary importance is that the pivot center of described first roller is also discharged the position of a side than the pivot center of described second roller near paper,

The described second place is that the pivot center of described second roller is also discharged the position of a side near paper than the pivot center of described first roller, and is the position that this first roller of releasing and this second roller are clamped described paper.

3. paper output mechanism according to claim 1 is characterized in that:

With described first roller and be arranged in described second roller on the described primary importance is discharged process from described paper to described paper placement section, when when this paper placement section is discharged the rear end part of this paper, the driven in rotation speed of the roller that is rotated by described actuator driving becomes faster speed.

4. according to each the described paper output mechanism in the claim 1 to 3, it is characterized in that:

Described roller antithetical phrase is arranged near the paper discharge orifice of the dwell section that is located at sheet conveying path set in the printer main body and this printer main body the position.

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