JP2005169788A - Image forming apparatus - Google Patents

Abstract

An object of the present invention is to provide an image forming apparatus capable of easily maintaining an interval (paper interval) between a recording unit and a platen at an appropriate value and stably performing high-quality image recording. A platen 23 having a plurality of suction holes 23a is fixed to a platen mounting member 26 having an opening 26b in a sealed state, and a hollow stay 25 having an opening 25a is interposed via a rubber-like elastic seal member 28. The platen mounting member is fixed in a sealed state, and an adjustment screw 23c that is screw-engaged with the stay via the platen mounting member is provided on the platen, and the height of the platen relative to the stay is adjusted in the sealed state by the sealing member and the adjusting screw. As a result, the interval between the recording means 41 and the platen 23 is adjusted.
[Selection] Figure 4

Description

  The present invention relates to an image forming apparatus that forms an image on a recording medium using a recording unit, and more particularly to a configuration of a platen that guides the recording medium in an image forming unit.

  As an image forming apparatus that records an image while transporting a recording medium such as a recording paper or a recording film, the one described in Patent Document 1 is known. An example of a conventional apparatus according to the following will be described in detail. In FIG. 6, an image forming apparatus 100 is configured to form an image while holding a roll-shaped recording paper Pr and a roll holder 110 as a paper feeding mechanism for rotatably feeding the paper, and holding the fed recording paper. Transport mechanism 120 for transporting (paper feeding), an image forming mechanism 140 for forming an image on the transported recording medium based on image information, and a paper discharge mechanism for discharging the image-formed recording paper to the outside of the apparatus 130.

  The transport mechanism 120 includes a transport roller (LF roller) 121 for feeding the recording paper Pr by a predetermined amount at the time of image formation, and a plurality of follower rotations that are pressed by the transport roller with a predetermined pressure. A pinch roller 122 and a platen (suction platen) 123 for holding the recording paper in a flat shape while being sucked are provided. The image forming mechanism 140 includes a recording head 141 as a recording unit that records on recording paper based on image information, and a carriage 148 that holds the recording head and performs reciprocating scanning (main scanning) in a direction orthogonal to the conveyance direction. I have. The plurality of pinch rollers 122 are rotatably attached to a main stay 150 disposed in the entire apparatus in the main scanning direction.

  A plurality of conveying bearings (LF bearings) 124 that rotatably hold the conveying roller 121 are arranged on a lower stay 125 having a hermetically sealed hollow structure. A suction platen 123 having a plurality of platen holes 123a is fixed to the lower stay 125 in a sealed state (airtight state). In addition, a platen suction fan 170 is connected to the internal cavity of the lower stay 125, and openings 125 a are formed at several central portions on the upper surface of the lower stay 125. With the above configuration, the platen suction fan 170 sucks the recording paper Pr by using the inside of the lower stay 125 as a duct and sucks the recording paper Pr. As a result, it is possible to prevent paper floating during recording operation, undulation (cockling) after recording, and the like, thereby improving the image quality of the recorded image and improving the reliability of the recording operation.

  In such an image forming apparatus, the interval between the surface of the recording paper and the ejection port surface of the recording head (this is referred to as the “inter-paper interval”) needs to be kept uniformly and accurately at a predetermined interval. If this is larger than the predetermined value, landing position deviation due to deviation in the ink ejection direction occurs (deviation), or the ink droplet after ejection stalls before reaching the paper surface, and the impact dot diameter becomes small (shobo), etc. This causes a reduction in image accuracy. In addition, the stalled ink droplet does not land on the paper surface but floats in the apparatus (ink mist) and may adhere to each mechanism unit, causing malfunction or control failure.

On the other hand, if the interval (between the sheets) is narrower than the predetermined value, the landing accuracy is improved. However, in the case of paper with large warpage (curl) or thin paper with no rigidity, a slight lift or There is a possibility that wrinkles or the like are generated and the image quality is lowered by contact with the recording head during image formation, or the discharge port surface (discharge port arrangement surface) of the recording head may be damaged. In particular, in the case of an ink jet recording type image forming apparatus that performs recording by ejecting ink from a discharge port of a recording head onto recording paper, paper floating during recording operation and waving (cockling) after recording occur. If the suction platen cannot fully suck the air, the same inconvenience as described above may occur.
JP 2003-012205 A

  However, in the case of image formation having the above-described configuration, the sheet spacing includes the flatness of the lower stay 125 and the suction platen 123, the straightness of the upper stay (main stay) 150, the alignment between the lower stay 125 and the upper stay 150, and the like. Therefore, it is difficult to maintain the paper gap at an appropriate value unless all of these accuracies can be maintained. In particular, in a large format machine, it becomes longer in the main scanning direction, so that it is difficult to maintain the accuracy of the parts of the upper stay 150 and the lower stay 125, and variation between papers is caused by bending due to its own weight. Further, when the pinch roller 122 is attached to the upper stay 150 and the transport roller 121 is attached to the lower stay 125, the bending due to the reaction force increases and the inter-sheet accuracy is further deteriorated. The present invention has been made in view of such a technical problem, and an object of the present invention is to be able to easily maintain the interval (paper interval) between the recording means and the platen at an appropriate value and stably. An object of the present invention is to provide an image forming apparatus capable of performing high-quality image recording.

  In order to achieve the above object, an image forming apparatus according to the present invention has a plurality of suction holes formed in a platen for guiding a recording medium conveyed through an image forming area for recording by a recording unit, and has openings. The platen mounting member is fixed to the platen mounting member in a sealed state via a sealing member, and the platen mounting member is fixed to the hollow stay having an opening via a rubber elastic sealing member in a sealed state, and the platen mounting member The platen is provided with an adjusting screw that engages with the stay via the stay, and the height of the platen with respect to the stay is adjusted in a sealed state by the seal member and the adjusting screw. The distance between the platen and the platen is adjusted.

  According to the present invention, the height of the platen is adjusted in a sealed state by the sealing member and the adjusting screw, so that the interval between the recording means and the platen is adjusted. Provided is an image forming apparatus that can easily maintain an interval (paper interval) at an appropriate value and stably perform high-quality image recording.

  Embodiments of the present invention will be specifically described below with reference to the drawings. Note that the same reference numerals denote the same or corresponding parts throughout the drawings. FIG. 1 is a schematic perspective view showing an embodiment of an image forming apparatus to which the present invention is applied as viewed obliquely from the front. FIG. 2 is a schematic perspective view showing the image forming apparatus of FIG. FIG. 3 is a schematic perspective view showing a partially broken schematic configuration of the inside of the image forming apparatus of FIG. 4 is a schematic longitudinal sectional view showing a detailed structure of a main part of an embodiment (FIG. 1) of an image forming apparatus to which the present invention is applied, and FIG. 5 is a drawing mechanism and a suction platen of the image forming apparatus of FIG. It is a typical perspective view which shows a mechanism.

  1 to 5, an image forming apparatus 1 is roughly divided into a paper feed mechanism 10 including a roll paper holder for feeding recording paper Pr as a roll-shaped recording medium held rotatably, and a paper supply mechanism 10. An image forming mechanism 40 that performs image formation (recording) based on image information on the printed recording paper, a transport mechanism 20 that transports (paper feed) while holding the recording paper through a paper passing path of the image forming mechanism, and an image A paper discharge mechanism 30 is provided for discharging the formed recording paper Pr to the outside of the apparatus. The paper discharge mechanism 30 has a paper discharge cover 31 for receiving the discharged recording paper Pr and controlling the discharge posture, and an openable / closable opening disposed on the upper surface side of the recording paper Pr. A top cover 32 is provided. The top cover 32 is formed by blow molding in which the inside is sealed and has a hollow structure. In the present embodiment, a blow molded product is employed for reasons such as light weight, high rigidity, and die cost, and this has been widely employed in recent years especially for exterior parts of large machines.

  The roll paper holder 10 holds the roll paper Pr rotatably by the spool shaft 11 and the pair of spool flanges 12L and 12R, and allows one spool flange 12L to slide along the spool shaft 11 so that the roll paper Pr It is comprised so that the width direction may be regulated. Further, the roll paper holder 10 includes a roll paper feed roller 13 for feeding the roll paper Pr, and a plurality of driven rollers 14 pressed against the roll paper feed roller 13 with a predetermined pressure. Further, the roll paper holder 10 is supported by the pair of slide rails 15L and 15R so as to be able to be drawn out from the apparatus main body 1 in order to facilitate replacement of the roll paper Pr.

  The roll paper feed roller 13 is driven by a driving force transmitted from a paper feed motor (not shown). The transport mechanism 20 includes a transport roller (LF roller) 21 for transporting (feeding) a predetermined amount of recording paper during image formation, and a plurality of pinch rollers 22 that are driven to rotate while being pressed by a predetermined pressure. And a suction platen 23 for holding the recording paper Pr in a flat shape while sucking it. The image forming mechanism 40 includes a recording head 41 serving as an image forming unit (recording unit), and a reciprocating movement (main) in a direction X that holds the recording head 41 and intersects (for example, orthogonally intersects) the recording paper conveyance direction Y (sub-scanning direction). And a carriage 48 for scanning.

  First, the configuration of the image forming mechanism 40 will be described. The recording head 41 in the present embodiment is an ink jet recording head that performs image formation (recording) by discharging ink from a discharge port to a recording paper Pr based on image information. That is, in synchronization with the reciprocating movement of the carriage 48 holding the recording head 41 in the main scanning direction, an image is formed by ejecting ink droplets from the ejection port onto the recording paper Pr by a head driving signal based on the image data. It is configured. A bearing 42 and a slide bearing 43 of the carriage 48 are slidably fitted to a main rail 51 and a sub rail 52 which are attached to the apparatus main body in parallel with a main stay 50 installed in the entire main scanning direction. The bearings 42 and the slide bearings 43 are provided at both ends in the direction orthogonal to the moving direction of the carriage 48.

  The slide bearing 43 is slidable in the arrow Y direction (sub-scanning direction, recording medium conveying direction) and is urged (pressed) to the sub rail 52 with a predetermined pressure by a slide spring 43a. The reciprocating movement of the carriage 48 is performed by receiving (transmitting) a forward and reverse driving force of a carriage motor (not shown) disposed near one end of the main stay 50 via the carriage belt 54. The drive control of the carriage 48 is performed by a detection signal from the linear sensor 44.

  With the above-described configuration, the carriage 48 is always spring-biased (pressed) toward the main rail 51, so that vibrations when the carriage moves, fluctuations in the fitting backlash of the bearing 42, etc. Therefore, higher quality image formation is possible. A linear sensor 44 is mounted on the upper part of the slide bearing 43. The linear sensor 44 on the carriage 48 reads the scale (or slit) of the linear scale 53 disposed on the main stay 50 in the main scanning direction and generates a detection signal. By this detection signal, drive control of the carriage 48 and the above-described image formation control are performed.

  In the present embodiment, an optical sensor that is relatively inexpensive and excellent in handleability is used as the linear sensor 44, and the position of the carriage 48 is controlled by counting the number of slits of the linear scale 53 in which slits are formed at a predetermined pitch. Is done. The optical linear sensor is relatively inexpensive and excellent in handleability, but is disadvantageous to dirt and scratches. In particular, in an ink jet recording apparatus, there is a possibility of causing control failure due to adhesion of ink mist or the like. On the other hand, in the present embodiment, the linear scale 53 is disposed at a position farthest from the image forming area where the ink mist is generated most, and therefore, the ink mist adheres to the linear scale 53. There is no.

  Next, the transport mechanism 20 including the transport roller 21 and the suction platen 23 will be described. 4 and 5, the transport mechanism 20 is provided with a platen 23 for guiding a recording medium Pr transported through an image forming region (recording region) for recording by a recording head 41 as a recording unit. Has been. The conveyance roller 21 operates during each main scan of the recording means (recording head) 41 and conveys (paper feeds) the recording paper Pr by a predetermined pitch. However, the conveyance accuracy greatly affects the image quality. Therefore, the outer diameter and runout of the transport roller 21 are finished with high accuracy. Furthermore, measures such as sandblasting the roller surface of the conveying roller 21 or applying alumina powder on the roller surface to increase the surface friction coefficient of the conveying roller 21 to prevent the recording paper from slipping as much as possible. It has been. The transport roller 21 is driven by a transport motor (LF motor) 60 connected to one end.

  The pinch roller 22 is rotatably supported by a pinch roller arm 22a, and is urged (pressed) toward the conveying roller 21 by a rear pinch roller spring 22b, and these are unitized by a pinch roller holder 22c. ing. The pinch roller holder 22c is attached to the main stay 50 described above. A plurality of conveyance (LF) bearings 24 that rotatably support the conveyance roller 21 are disposed on a hollow stay 25, that is, a lower stay 25 having a sealed cavity structure.

  The platen 23 is a suction platen, and has a plurality of platen holes 23a. By sucking negative pressure through the platen hole 23a, a recording medium such as recording paper Pr is adsorbed onto the platen 23. This suction mechanism will be described later. In this embodiment, the platen 23 is divided into a plurality of parts in the moving direction of the recording head 41 (carriage 48). In the illustrated example, the suction platen 23 is divided into a plurality of parts (example shown in the figure) divided in the main scanning direction. In this case, the suction platens 23 are composed of two pieces. Each suction platen 23 has substantially the same configuration and exhibits the same function and effect. Therefore, hereinafter, one suction platen 23 will be described unless otherwise specified, and the description of the other suction platens 23 will be applied mutatis mutandis. .

  Each suction platen 23 is sealed to the upper surface of a platen mounting member (platen mounting plate) 26 by a plurality of screws 23b through a platen seal 27 as a sealing member that abuts (adheres) to the entire circumference of the lower end portion thereof. It is fixed in a state (sealed state). The platen mounting member 26 is formed of an L-shaped sheet metal part as viewed from the side. Here, the platen 23 is difficult to maintain the accuracy of flatness as the platen 23 becomes longer, and the molding die is expensive. For this reason, in the present embodiment, the integrated structure is not used and the main scanning direction is used as described above. It is divided into a plurality of parts. Such a configuration is advantageous for increasing the size of the image forming apparatus. Each of the divided platens 23 has substantially the same configuration.

  The mounting plate 26 as a platen mounting member is fixed to the lower stay 25 (the front surface thereof) with screws 26a through a rubber-like elastic seal member 28, that is, a lower stay seal 28 having elasticity. In this case, the platen mounting plate 26 needs to be fixed to the upper surface of the lower stay 25 in a sealed state via the lower stay seal 28 of a rubber-like elastic body. It needs to be structured to be mounted as possible. Therefore, the shape of the mounting hole of the screw 26a of the platen mounting plate 26 is a vertically long shape. Further, an adjustment screw 23 c that is engaged with the platen mounting plate 26 and screwed (fastened) to the stay 25 is provided at the center of the suction platen 23.

  Here, since the platen mounting member 26 is an L-shaped sheet metal member as viewed from the side, the platen mounting member 26 itself has a spring property and is a seal member (lower) made of a rubber-like elastic body that is in close contact with the lower side (lower surface). The stay seal) 28 is biased upward by the elasticity (spring property). Therefore, the position of the platen mounting plate 26 can be adjusted upward by loosening the adjusting screw 23c, and the position of the platen mounting plate 26 can be adjusted downward by screwing (tightening). Accordingly, the height of the platen 23 can be freely adjusted within a predetermined range in a state where the periphery of the upper surface opening of the lower stay 25 is sealed (sealed) with the lower stay seal 28. That is, it is possible to freely adjust the interval (between paper sheets) between the recording head 41 as the recording means (the discharge port arrangement surface 41a in the case of the ink jet recording method) and the surface of the suction platen 23 within a predetermined range. When the elasticity (spring property) of the lower stay seal 28 is insufficient, a compression spring or a leaf spring as a spring member may be mounted between the platen mounting plate 26 and the lower stay 25. Such a method for adjusting the vertical position of the platen 23 will be described later.

  As a suction mechanism for the suction platen 23, a platen suction fan 70 as a suction means is connected inside the hollow stay 25. In other words, a platen suction fan 70 communicating with (in communication with) the interior (hollow part) of the stay 25 is connected to one end of the lower stay 25 via a duct (suction duct) 71. In the present embodiment, a sirocco fan that can easily obtain a high output (static pressure) with a small amount of electric power is used as the platen suction fan 70. Openings 25a (two in this embodiment) are formed at several locations in the center of the upper surface of the lower stay 25. In the present embodiment, each opening 25a is formed at a position below each of the suction platen 23 divided into a plurality. Moreover, the opening part 26b (2 places in this embodiment) is formed also in the position corresponding to each opening part 25a of the platen mounting plate 26. FIG.

  With the above configuration, the suction negative pressure generated by the platen suction fan 70 disposed on the back surface of the image forming apparatus 1 is sequentially applied to the suction duct 71, the cavity of the lower stay 25, the openings 25a, and the openings 26b. These are introduced into the plurality of platen holes 23a through the respective suction platens 23. The recording paper Pr is attracted to the platen surface of the suction platen 23 by the negative pressure suction force acting on the platen hole 23. As a result, it is possible to eliminate paper floating during recording operation, waviness (cockling) after recording, and the like.

  Next, a method of adjusting the size of the gap (between paper sheets) between the recording head 41 (in the case of an ink jet recording head, the ejection port surface on which the ink ejection port is disposed) and the surface (platen surface) of the suction platen 23. That is, a method for adjusting the sheet interval of the suction platen 23 will be described. The height of the suction platen 23 is adjusted using a jig 80 as shown in FIG. The jig 80 has a shape that approximates the cross-sectional shape of the carriage 48 in the recording medium conveyance direction, and two dial gauges 81a and 81b are mounted thereon. Each of the dial gauges 81a and 81b is of a type that measures height displacement in the vertical direction (change in the vertical position). The reference point of the dial gauges 81a and 81b is paper at the point where the tip of the dial gauge contacts the platen surface of the suction platen 23. The interval is set to a proper value.

  As an adjustment method, as a first step, the platen mounting member 26 is fixed to the lower stay 25 with screws 26b at a position where the dial gauge 81a contacting the front side of the suction platen 23 indicates the reference point. As a second step, the adjustment screw 23c is tightened (screwed in) or loosened until the dial gauge 81b in contact with the back side of the suction platen 23 reaches the reference point. As a third step, when there are a plurality of suction platens 23 (in the case of a divided type), the position of the platen mounting plate 26 is adjusted at a plurality of locations as described above and fixed to the lower stay 25, and a plurality of suction platens 23 The height of each of 23 is adjusted with an adjusting screw 23c. As a result, regardless of the number of suction platens 23, the length of the lower stay 25, etc., the sheet spacing is set to an appropriate value in all locations (all areas) in the main scanning direction (axial direction of the main rail 51). A state can be secured. In the case of the inkjet image forming apparatus, the state where the interval between the discharge port surface (discharge port arrangement surface) 41 a of the recording head 41 and the surface of the platen 23 is maintained at an appropriate value throughout the entire platen 23 can be maintained. it can.

  That is, the image forming apparatus described above forms a plurality of suction holes 23a in the platen 23 for guiding the recording medium Pr conveyed through the image forming area for recording by the recording means 41, and has the openings 26b. The platen is fixed to the platen mounting member 26 through a seal member 27 in a sealed state, and the platen mounting member is fixed to a hollow stay 25 having an opening 25a through a rubber-like elastic seal member 28 in a sealed state. An adjustment screw 23c that is screwed to the stay via the platen mounting member is provided on the platen, and the height of the platen with respect to the stay is adjusted in a sealed state by the seal member and the adjustment screw. The interval between the recording means 41 and the platen 23 (paper interval) is adjusted. With such a configuration, regardless of the component accuracy and alignment accuracy of the stay 25, the interval between the recording head 41 and the platen 23 (between sheets) can be easily adjusted to an appropriate value throughout the entire image forming area. Therefore, stable and high-quality image recording can be performed regardless of the image size, paper width, and the like. Further, it is possible to easily reduce the size of the platen and maintain the component accuracy, and the cost of the molding die can be reduced.

  That is, according to the embodiment described above, the L-shaped platen mounting member 26 to which at least one platen that adsorbs the recording paper Pr is fastened in a sealed state is provided to the stay 25 that also serves as a suction duct. Since it is attached in a sealed state and freely movable up and down and is provided with a vertical adjustment screw 23c at the center of each platen 23, even if the accuracy of parts such as the upper stay 50 and the lower stay 25 is not ensured, The interval between the recording head 41 and the platen 23 (paper interval) can be held at an appropriate value at all positions on the platen. In addition, as the vertical adjustment method, the upward adjustment uses the elasticity of the seal member 28 and the spring property of the L-shaped platen mounting member, and the downward adjustment is performed with the screw 23c, so that a complicated adjustment mechanism is unnecessary. Can be configured easily and inexpensively. In particular, even if the stays 50 and 25 become longer in the main scanning direction as in a large format machine, and the accuracy of the parts decreases, or bending due to its own weight occurs, the platen 23 is divided into a plurality of parts, and each is independently adjusted. By making it possible, the gap between the sheets can be adjusted to an appropriate value and held at all positions.

  In the above embodiment, the case of recording on roll paper has been described as an example. However, the present invention feeds a recording medium of a desired size one by one and records an image on each sheet. The present invention can be similarly applied to the image forming apparatus, and the same operation and effect can be obtained. In the above embodiment, the image forming apparatus of the ink jet recording method has been described as an example. However, the present invention can be similarly applied to an image forming apparatus of another recording method. Action and effect can be obtained. In the above embodiment, the image forming apparatus of the serial recording form that records while moving the recording unit with respect to the recording medium has been described as an example. However, the present invention is not limited to the entire width or part of the recording medium. The present invention can be similarly applied to an image forming apparatus of a line recording form in which recording is performed only by sub-scanning using a line-type recording unit having a covering length, and similar effects can be achieved.

  The present invention also uses an image forming apparatus that uses one recording head, a color image forming apparatus that uses a plurality of recording heads that record with different color inks, or a plurality of recording heads that record with the same color and different densities. The present invention can be similarly applied to a gradation image forming apparatus and further an image forming apparatus in which these are combined, and the same effect can be obtained. Furthermore, when the present invention is applied to an image forming apparatus of an ink jet recording system, a configuration using a replaceable ink cartridge in which a recording head and an ink tank are integrated, the recording head and the ink tank are separated, and ink is supplied between them. The present invention can be similarly applied to any arrangement configuration of the recording head and the ink tank, such as a configuration in which the tubes are connected by a tube, and the same effect can be obtained. The present invention can be applied to an ink jet recording method, for example, a case where a recording unit using an electromechanical transducer such as a piezo element is used. This provides an excellent effect in an image forming apparatus that uses a recording unit that ejects ink. This is because such a system can achieve high density and high definition of image recording.

1 is a schematic perspective view showing an embodiment of an image forming apparatus to which the present invention is applied as viewed obliquely from the front. FIG. 2 is a schematic perspective view showing the image forming apparatus of FIG. 1 as viewed obliquely from behind. FIG. 2 is a schematic perspective view showing a partially broken schematic configuration of the inside of the image forming apparatus of FIG. 1. It is a typical longitudinal section showing the detailed structure of the important section of one embodiment (Drawing 1) of the image forming device to which the present invention is applied. FIG. 5 is a schematic perspective view illustrating a conveyance mechanism and a suction platen mechanism of the image forming apparatus in FIG. 4. It is a central part longitudinal cross-sectional view which shows the example of 1 structure of the image forming apparatus before applying this invention.

Explanation of symbols

1 Image forming apparatus 10 Paper feed mechanism (roll paper holder)
DESCRIPTION OF SYMBOLS 11 Spool axis | shaft 13 Roll paper feed roller 14 Driven roller 20 Conveyance mechanism 21 Conveyance roller 22 Pinch roller 22a Pinch roller arm 22c Pinch roller holder 23 Platen (suction platen)
23a Platen hole (suction hole)
23b Screw 23c Adjustment screw 24 Conveying bearing 25 Stay (lower stay)
26 Platen mounting member (platen mounting plate)
26a Screw 26b Opening 27 Seal member (platen seal)
28 Seal member (lower stay seal)
30 Paper discharge mechanism 31 Paper discharge cover 32 Top cover 40 Image forming mechanism (recording mechanism)
41 Recording means (recording head)
41a Discharge port surface (Discharge port surface)
42 Bearing 43 Stay bearing 44 Linear sensor 48 Carriage 50 Main stay (upper stay)
51 Main rail 52 Sub stay 53 Linear scale 54 Carriage belt 70 Suction means (platen suction fan)
71 Suction duct 80 Jig 81a, 81b Dial gauge Pr Recording medium (recording paper, etc.)

Claims (5)

  A plurality of suction holes are formed in a platen for guiding a recording medium conveyed through an image forming area for recording by a recording means, and the platen is sealed in a platen mounting member having the opening via a seal member. The platen mounting member is fixed in a sealed state to a hollow stay having an opening through a rubber elastic seal member, and an adjustment screw that is screw-engaged to the stay through the platen mounting member An image is provided on the platen, and the distance between the recording unit and the platen is adjusted by adjusting the height of the platen with respect to the stay in a sealed state by the seal member and the adjusting screw. Forming equipment.   The image forming apparatus according to claim 1, wherein the platen mounting member is a plate member having an L-shaped side surface.   3. The platen according to claim 1, wherein the platen is divided into a plurality in the moving direction of the recording means, and openings are provided at positions corresponding to the platen mounting members and the platens of the stay. The image forming apparatus described in 1.   The image forming apparatus according to claim 1, wherein a suction unit is connected to the inside of the stay.   The image forming apparatus according to claim 1, wherein a spring member is provided between the platen mounting plate and the stay.

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