JP2000168986A - Conveying belt and image forming apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] The power supply area and the power supply means are securely joined together,
An object of the present invention is to provide a sheet conveying apparatus and an image forming apparatus that can supply power stably and have excellent cleaning properties. The belt member includes an electrode member.
The electrode member 36 'is composed of a conductive electrode plate 36'a and a ground plate 36'b. In the power-supplied area of the belt member 31 ', conductive areas 36'E1 and 36'E2 made of a conductive material for supplying power are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport belt for electrostatically attracting and transporting a sheet material. For example, the present invention relates to a method for transporting a sheet material in an image forming apparatus having image forming means for forming an image based on image information. Applied for conveying sheet materials.

[0002]

2. Description of the Related Art In general, an ink jet recording apparatus performs recording by ejecting ink from a recording head to a sheet material. Therefore, it is easy to make the recording head compact, and it is possible to record a high-definition image at a high speed. It has advantages such as low running cost, low noise due to the non-impact method, and easy recording of a color image using multicolor inks. Among them,
A full-line type apparatus using a line-type recording head having a large number of ejection ports arranged in the paper width direction can further increase the recording speed.

However, in a full-line type apparatus, the distance from the recording head at the most upstream position to the recording head at the most downstream position becomes considerably long.
Since the sheet material is lifted in the recording area, which may cause a disturbance of a recorded image or a jam, it is necessary to urge the sheet material downward so as not to float. As a means therefor, there is generally known a method of providing a conductive electrode, giving an electric charge to generate an electrostatic force, and adsorbing a sheet material.

In such an ink jet recording apparatus, a sheet material fed by a sheet feeding device is sucked and held on an upper surface of a conveying belt by an electrostatic attraction member provided on the conveying belt in a recording area, and is recorded by a recording head. While being transported by the transport belt.

FIG. 7 is a cross-sectional view of a conventional ink jet recording apparatus, and FIGS. 8 (a), 8 (b) and 8 (c) are enlarged views of a main part thereof.

In FIG. 7, a sheet material P is stacked on a sheet feeding unit 2, and is fed one by one from above by a sheet feeding roller 22.

The fed sheet material P is driven by a driven roller 32.
And a pinch roller 33, the belt member 31 having an electrode member 36, which will be described later, is attracted and sandwiched between the belt member 31 and conveyed by a driving roller 34 driven by a pulse motor (not shown) as a driving source. It is transported to the printing start position.

The belt member 31 is stretched by a driving roller 34, a driven roller 32, and a pressure roller 35, and the pressure roller 35 is turned around the other end of an arm 50 that is swingably attached to the platen 30 at one end. It is movably attached, and tension is applied to the belt member 31 by the arm 50 being pressed by the spring 51.

The recording head 7 is a full-line type in which a plurality of recording elements are arranged over the entire width of the recording area of the sheet material P.
(Cyan), 7M (magenta), and 7Y (yellow) in this order, and are attached to the head holder 7A.

In FIG. 8A, the above-described electrode member 36 is provided on the belt member 31.

In the figure, an electrode member 36 is composed of a pair of electrode plates 36A and a ground plate 36B made of a conductive metal, and has a comb-teeth shape as shown in the figure, and each convex portion enters each concave portion. A plurality of sets of electrode plates 36A and ground plates 36B are arranged over the printing area. In addition, portions (terminals) 36A1 and 36B1 where the pattern is exposed are provided on both sides of the belt member 31 in the moving direction.
As shown in (c), a power supply member 52 is provided which is in contact with each other, a positive or negative voltage is applied to the terminal 36A1 of the electrode plate 36A, and the terminal 36B1 of the ground plate 36B is grounded.

FIG. 8B is a cross-sectional view of FIG. 8A taken from the direction of the arrow a, and shows the electrode member 36 provided on the belt member 31.
FIG.

As shown in the figure, the electrode member 36 is protected by an electrode plate 36A made of a conductive metal and an earth plate 36B sandwiched between a base layer 36C made of a synthetic resin such as polyethylene and polycarbonate and a surface layer 36D. Is formed.

In the above configuration, the sheet material P is attracted to the upper surface of the belt member 31 by the electrode member 36, and is conveyed by the belt member 31 while being printed by the recording head 7.

The cleaning roller pair 38 removes dirt adhering to the belt, and is provided to be pressed by the belt member 31.

The discharge roller 41 is driven by the rotating force of the drive roller 34 by a transmission means (not shown).

The spur 42 comes into pressure contact with the paper discharge roller 41, and the printed sheet material P is sandwiched between the paper discharge roller 41 and the spur 42, and can be discharged and stored in a paper discharge tray 43. The spur 42 has a pointed shape so that the ink of the printed image does not transfer as much as possible in order to transfer the printing surface after recording.

[0018]

However, in the above-described conventional ink jet recording apparatus, the belt member 31 is provided with the electrode members 36 formed of the comb-teeth electrodes composed of the electrode plate 36A and the earth plate 36B, and is provided on both sides in the transport direction with the power supply area. Since the portions (terminals) 36A1 and 36B1 exposing a certain pattern are provided, ink erroneously flowing out of the recording head 7, mist-like ink droplets (ink mist) composed of satellites, micro dots, etc. by ink ejection, When dust or paper dust adheres to the power-supplied area, the connection between the terminal and the power supply member becomes unstable, and power cannot be supplied stably.

Further, since the pattern of the power-supplied area is exposed, the entire electrode member 36 or the power-supplied area 36A1 is formed in order to prevent deterioration due to contact with ink, the atmosphere, or the like.
, 36B1 must be made of expensive materials (for example, gold, silver, etc.).

Further, if the surface of the belt member 31 is not a water-repellent surface, the adhered ink, paper dust and the like cannot be reliably removed, resulting in poor cleaning performance.

Accordingly, the present invention provides a sheet conveying apparatus and an image forming apparatus which are capable of reliably joining a power-supplied area and a power-supplying means, stably supplying power, and having excellent cleaning properties. The purpose is to:

[0022]

In order to solve the above-mentioned problems, according to the present invention, a belt member composed of a plurality of layers and a plurality of pairs provided between layers of the belt member are supplied with electric power from the outside. A conductive electrode member having a power-supplied region and an attraction force generating region for generating a potential difference, wherein the sheet material can be conveyed by electrostatically adsorbing a sheet material to a supporting surface of the belt member. The belt member includes a base layer sandwiching the electrode member, and a dielectric layer made of a dielectric material on the supporting surface side of the base layer. And a conductive region made of a conductive material capable of supplying power from the power supply.

It is also preferable that the supporting surface of the sheet material composed of the dielectric layer and / or the conductive region is subjected to a water-repellent treatment.

It is also preferable that the conductive regions are provided at both ends in the moving direction of the conveyor belt.

It is also preferable that the plurality of pairs of electrode members are arranged in a comb-tooth shape in a direction orthogonal to the moving direction of the conveyor belt.

In the image forming apparatus, an image forming unit is disposed at a position facing the conveyor belt and forms an image based on image information, and a power supply unit for supplying power to a conductive region on the power supply region. And a transport belt for transporting the sheet material.

A recording head wound around at least one pair of conveying rollers and arranged at a position facing the conveying belt to form an image by causing ink to fly on a conveyed sheet material; It is also preferable to include a power supply unit for supplying power to the conductive region on the power supply region, and the transport belt that transports the sheet material.

The plurality of recording heads are arranged in the transport belt moving direction such that discharge ports for ejecting ink in a direction orthogonal to the transport belt moving direction are arranged.

It is also preferable that the recording head is a full line type recording head in which a plurality of recording elements are arranged over the entire width of the recording area of the sheet material.

Further, the recording head is a recording head that performs recording by discharging ink using thermal energy,
An electric heat energy converting means for generating heat to be applied to the ink is provided.

[0031]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. A recording apparatus 1 having an automatic paper feeder includes a paper feed unit 2, a paper feed unit 3, a paper discharge unit 4,
It comprises a recording head unit 7.

Therefore, these are divided into items and outlines are sequentially described. FIG. 1 is a cross-sectional view illustrating the entire configuration of the recording apparatus 1, and FIG. 2 is a cross-sectional view illustrating the configuration of a paper feeding unit 3 of the recording apparatus 1.
1 and 2, (I) paper feeding unit, (II) paper feeding unit, (III)
The recording head unit and the (IV) paper discharge unit will be described. (I) Paper Feeding Unit The paper feeding unit 2 includes a pressure plate 21 on which the sheet material P is stacked and the sheet material P.
The feed rotator 22 that feeds the paper is attached to the base 20. The pressure plate 21 is rotatable about a rotation axis a coupled to the base 20, and is urged by the pressure plate spring 24 to the feeding rotating body 22. A separation pad 25 made of a material having a large coefficient of friction, such as an artificial skin, for preventing double feeding of the sheet material P is provided at a portion of the pressure plate 21 facing the feeding rotating body 22. Further, the base 20 has a sheet material P
Are provided with a separating claw 26 for separating the sheet material P one by one and a release cam (not shown) for releasing the contact between the pressure plate 21 and the rotary feeder 22.

In the above configuration, a release cam (not shown) pushes the pressure plate 21 down to a predetermined position in the standby state. Thereby, the contact between the pressure plate 21 and the feeding rotary plate 22 is released. Then, in this state, when the driving force of the transport roller 32 is transmitted to the feed rotating body 22 and a release cam (not shown) by a gear or the like, the release cam (not shown) separates from the pressure plate 21 and the pressure plate 21 rises. The sheet P is brought into contact with the feeding rotator 22, the sheet P is picked up by the rotation of the feeding rotator 22, and the sheet feeding is started. Sent.

The feed rotator 22 rotates until the sheet material P is fed into the paper feed unit 3, and again the sheet material P and the feed rotator 22
And the driving force from the transport roller 32 is cut off.

The feed rotator 90 is a feed rotator for manual paper feed. The sheet material P set on the manual feed tray 91 is fed by the feeding rotating body 90 in accordance with a recording command signal of the computer, and is conveyed to the conveying roller 32. (II) Paper Feeding Unit The paper feeding unit 3 has a belt member 31 ′ (described later) that adsorbs and transports the sheet material P, and a PE sensor (not shown). The belt member 31 'is driven by a driving roller 34, and is wound around a transport roller 32 and a pressure roller 35, which are driven roller members.

The transport roller 32 and the drive roller 34 are rotatably mounted on the platen 30, and the pressure roller 35 has an arm 50 whose one end is swingably mounted on the platen 30.
The arm 50 is pressed by a spring 51 to apply tension to the belt member 31 ′.

The platen 30 is located below the belt member 31 'and serves to hold the belt member 31'.

A pinch roller 33 driven by a belt member 31 'is provided at a position facing the transport roller 32.

The pinch roller 33 is pressed against the belt member 31 'by a spring or the like (not shown) to
To the recording unit.

Further, an upper guide 27 and a lower guide 28 for guiding the sheet material P are provided at an entrance of the paper feeding section 3 to which the sheet material P is conveyed. Also, the upper guide 27
Is provided with a PE sensor lever 29 for transmitting the leading and trailing edge detection of the sheet material P to a PE sensor (not shown).
Further, a recording head 7 that forms an image based on image information is provided downstream of the transport roller 32 in the sheet transport direction.

In the above configuration, the sheet material P sent to the sheet feeding section 3 is guided by the upper guide 27 and the lower guide 28, and is sent to a pair of rollers including a transport roller 32 and a pinch roller 33.

At this time, the leading end of the conveyed sheet material P is detected by the PE sensor lever 29 to determine the printing position of the sheet material P.

The sheet material P is conveyed by the rotation of a belt member 31 'via a conveying roller 32 by a paper feed motor described later. (III) Recording Head Unit The recording head 7 according to the first embodiment of the present invention uses a line type ink jet recording head in which a plurality of nozzles are arranged in a direction orthogonal to the conveying direction of the sheet material P. The recording heads 7 are mounted on the head holder 7A at predetermined intervals in the order of 7K (black), 7C (cyan), 7M (magenta), and 7Y (yellow) from the upstream side in the P transport direction.

The recording head 7 is a recording head that performs recording by discharging ink using thermal energy, and includes an electric heat energy converting means for generating heat to be applied to the ink. It is possible to give.

Then, the ink causes film boiling due to the heat,
Ink is ejected from the nozzles 70 of the recording head 7 by a pressure change caused by growth or contraction of bubbles due to the film boiling, and an image is formed on the sheet material P.

One end of the recording head 7 is rotatably fixed by a shaft 71, the protruding portion 7 A formed at the other end is engaged with the rail 72, and the distance between the nozzle surface and the sheet material P (the paper interval) ) Is stipulated. (IV) Discharge Unit The discharge unit 4 includes a discharge roller 41 and a spur 42, and the sheet material P on which an image is formed by the recording unit is sandwiched between the discharge roller 41 and the spur 42 and conveyed. Paper output tray 4
It is discharged to 3.

Next, the structure of the electrostatic suction conveyance in the recording unit,
The operation, the structure of the electrode member, and the structure of the belt member 31 'will be described with reference to FIGS. 1 to 4A and 4B.

First, the operation of the electrostatic suction conveyance and the belt member 3
1 'will be described with reference to FIGS. 1 and 2 and FIGS. 4 (a) and 4 (b).

In FIGS. 1 and 2, the belt member 31 'moves while adsorbing and holding the sheet material P.
It is made of a synthetic resin such as polyethylene or polycarbonate having a thickness of about 0.2 mm, and has an endless belt shape.

For details of the belt member 31 ', see
This will be described with reference to FIGS.

The belt member 31 'is shown in FIGS. 4 (a) and 4 (b).
As shown in FIG. 5, in the attraction force generating region, an electrode member 36 ', which will be described later, including a conductive electrode plate 36'a and an earth plate 36'b, has a base layer 36'C which is a dielectric layer made of a dielectric material. Surface layer 3 which is the base material layer of belt member 31 '
6'D and are provided in a protected manner.

The base layer 36'C has a thickness of 10 @ 16 to 10 @ 17 .OMEGA.c.
m and the surface layer 36'D are both made of synthetic resin such as polyethylene, polycarbonate or the like having a thickness of 10 @ 10 to 10 @ 14 .OMEGA.cm.

The electrode member 36 ′ provided on the belt member 31 ′ is formed by applying a conductive carbon paste, and is connected to the belt member 31 ′ and is a power supply member 52 which is a component of a power supply unit described later. About 0.5kV ~ 1
By applying a voltage of 0 kV, an attraction force is generated on the carrying surface of the belt member 31 ′ in the recording section below the recording head 7.

The power supply member 5 which is a component of the power supply means
Reference numeral 2 is connected to a high-voltage power supply (not shown) that generates a predetermined high voltage.

The transport roller 32, the drive roller 34, and the pressure roller 35 support the belt member 31 'and apply an appropriate tension. The drive roller 34 is connected to a paper feed motor 50.

Further, a paper pressing roller 40 as pressing means for pressing the sheet material P against the conveying belt is provided with a support member 3.
9, the supporting member 39 is mounted around the rotation axis of the pinch roller 33, and the paper pressing roller 40 is urged toward the belt member 31 'by urging means (not shown). .

The cleaning roller pair 38 is provided so as to be pressed between the belt members 31 ′, is capable of removing dirt such as ink adhered to the belt member 31 ′, and has a pore diameter for preventing deterioration in durability. Small (10 μm
(Preferably ３０30 μm).

After the belt member 31 ′ is cleaned by the cleaning roller pair 38, the charge is removed by a charge removing brush 37 serving as a charge removing means.

Next, regarding the electrode member 36 ', FIGS.
This will be described with reference to (a), (b), and (c).

FIG. 3 is a partial cross-sectional perspective view of an attraction force generating area provided on the belt member 31 ', and FIG.
4B is a cross-sectional view as viewed from the direction of arrow b in FIG. 3, and FIG. 4C is a partial cross-sectional side view as viewed from the direction of arrow c in FIG.

In FIGS. 3, 4A and 4B, an electrode member 36 'is provided inside the belt member 31'.

In FIG. 3, the electrode member 36 'is composed of a conductive electrode plate 36'a and a ground plate 36'b.
Each tooth has an independent comb tooth shape as shown in
A plurality of belt members 31 'are provided so as to face each other in a direction orthogonal to the moving direction of the conveyor belt.

At both ends in the movement direction of the belt member 31 ′,
In parallel with the moving direction, conductive regions 36'E1 and 36'E2 made of a conductive material for supplying electric power are provided wider than the widths of the electrode plates 36'a and the ground plate 36'b in the moving direction of the conveyor belt. A power supply member 52, which is a component of the power supply means shown in FIG. 4C, which is connected to a high-voltage power supply that comes into contact with a predetermined pressure, is provided. A positive or negative voltage is applied to the conductive region 36'E1 made of the material, and the conductive region 36'E2 made of the conductive material of the ground plate 36'b is grounded.

The power supply member 5 which is a component of the power supply means
2 is preferably a conductive material having a volume resistivity of 10 @ -4 to 10 @ 7 .OMEGA.cm.

In the first embodiment of the present invention, when power is supplied from the high-voltage power supply to the power supply member 52 which is a component of the power supply means, switching control means (not shown) is provided in
The power supply to 6 'can be controlled.

Next, the power-supplied area of the electrode member 36 'will be described.

In the power supply area, the conductive electrode plate 3
6'a and an earth plate 36'b are provided in a protected manner sandwiched between a base layer 36'C made of a dielectric material and a conductive region 36'E1 made of a conductive material.

The conductive region 36'E1 made of a conductive material is 1
It is composed of a conductive synthetic resin containing carbon of 0-4 to 107? Cm. Further, the upper surface of the surface layer 36'D and the conductive region 36'E1 made of a conductive material are subjected to a treatment such as a fluororesin processing, so as to be in a state of good water repellency.

In FIG. 4A, the conductive electrode plate 3
When a voltage is applied to 6'a, an electric force is generated in the direction of the arrow, and a line of electric force is formed as shown by the arrow in FIG.

Then, due to the potential difference between the conductive electrode plate 36'a and the ground plate 36'b, an attraction force is generated on the carrying surface of the belt member 31 ', and the recording surface of the sheet material P
A charge (surface potential) having the same polarity as the voltage applied to the conductive electrode plate 36'a is generated.

Here, in the present invention, since the volume resistivity Ωcm is defined as the base layer (base layer 36 ′ C)> dielectric layer (surface layer 36 ′ D) of the belt member, the generated lines of electric force are generated by the belt member. The supporting surface becomes larger, and the adsorbing force for adsorbing the sheet material P can be increased.

Next, the operation of the electrostatic suction conveyance and the power supply means will be described with reference to FIGS. 2 and 4C.

In FIG. 2, the sheet material P is
2 and the pinch roller 33, are held on the belt member 31 ′, are pressed against the belt member 31 ′ by the paper pressing roller 40, are attracted to the flat portion of the belt member 31 ′ by the electrode member 36 ′, and are directed to the recording section. The paper feed motor 50 and the roller 3 are printed while being printed by the recording head 7.
4 is sent in the direction of arrow A.

Next, the power supply means will be described.

In FIG. 4C, the power supply member 52 is supported by a support member 53 and is connected to a high-voltage power supply (not shown).

The protection member 54 includes the power supply member 52 and the support member 5.
The protection member 54 is attached to the platen 30 so as to surround the entire periphery of the power supply unit, and is a conveying member on the side of the belt member 31 ′ around the entire side end of the protection member 54. A sealing member 5 made of a low-hardness elastomer provided in contact with the belt member 31 'at a predetermined pressure.
5 are provided.

As described above, the power supply means is constructed and installed so as to have a predetermined space around and to be isolated from the outside by the protection member 54 and the sealing member 55.

In the electrostatic attraction conveyance according to the first embodiment of the present invention, the belt member 31 ′ holding the sheet material P is a member that travels to the recording head 7 side even when recording the leading and trailing end portions of the sheet material P. Since there is no recording head, the discharge nozzle at the end of the recording head and the end of the sheet material P can be recorded while approaching each other, and a highly accurate recorded image can be obtained.

When a large amount of ink is ejected onto the sheet material P, the sheet material P swells and causes wavy (cockling). Also in this case, the sheet material P is attracted to the supporting surface side of the belt member 31 ′ by the attraction force of the electrode member 36 ′, so that the sheet material P does not float on the recording head 7 side. Stable recording without contact of

Further, even when the end of the sheet material P is wavy or curled due to a change in environment such as temperature and humidity, the sheet material P is held on the belt member 31 ′ by the paper pressing roller 40. Since the sheet can be conveyed to the suction force generation area while being pressed against the surface side and removing waving and curling, stable suction can be performed in the recording unit.

Next, the encoder 8 according to the first embodiment of the present invention
0 will be described with reference to FIG.

In FIG. 3, marks 80A as encoders are provided at a predetermined pitch on the surface of the belt member 31 '. This pitch is, for example, 1/180, 1/3
6'0 etc. can be considered.

The mark 80A is detected by a sensor (not shown) provided above the belt member 31 ', and a signal from the sensor is counted and integrated by detecting means (not shown).

A count value for stopping the sheet material P at a predetermined position is set in advance, and when the count value reaches the predetermined value, the driving of the belt member 31 'is stopped.

The mark 80A may be white when the belt member 31 'is black, and black when the belt member 31' is white.

The material of the mark 80A is not particularly limited as long as it can surely adhere to the surface of the belt member 31 '.

The mark 80A is not a mark attached to the surface of the belt member 31 'but may be a hole.

Further, in the first embodiment of the present invention, the electrode member 36 'and the power supply means are provided on the upper surface of the belt member 31'. And an attraction force may be generated on the carrying surface of the belt member 31 ′.

Similarly, the encoder 80 may be provided on the lower surface (back surface) of the belt member 31 ', and may be read on the lower surface (back surface).

(Embodiment 2) Next, the configuration and operation of Embodiment 2 of the present invention will be described with reference to FIG.

Schematic Embodiment 1 of Embodiment 2 of the Present Invention
The following is a description of the differences.

FIG. 5 is a partial cross-sectional perspective view of the suction force generating area including the belt member 31 '.

In FIG. 5, conductive regions 36'E1 and 36'E2 made of a conductive material in the power-supplied region are provided on the entire circumference of the belt member 31 '. By doing so, the manufacturing process of the belt member 31 'is simplified, and an apparatus with lower cost can be provided.

(Embodiment 3) Next, the configuration and operation of Embodiment 3 of the present invention will be described with reference to FIG.

The third embodiment of the present invention is the first embodiment.
The following is a description of the differences.

FIG. 6 is a partial sectional perspective view of an attraction force generating area provided with a belt member 31 '.

In FIG. 6, conductive regions 36'E1 and 36'E2 made of a conductive material in the power-supplied region have a shape in which the upper portion projects laterally from the lower portion, and engages with the surface layer 36'D with a step. It is.

By providing the steps as described above, when the ink erroneously flows out to the belt member 31 ', the ink permeates from the boundary between the surface layer 36'D and the conductive regions 36'E1, 36'E2 made of a conductive material. This can alleviate the problem and prevent the ink from reaching the electrodes.

[0099]

As described above, according to the present invention, in a belt member provided with an electrode member, a conductive layer made of a conductive material is formed in a power-supplied region on both side ends in the sheet material conveying direction, and the conductive layer and the power supply means are formed. Since the power supply is performed by contacting with the conductive material, there is no portion where the pattern is exposed, so that the conductive member or the power-supplied region does not have to be made of an expensive material for preventing deterioration due to contact with ink, atmosphere, or the like. It can be made of an inexpensive material such as carbon resin, and can be a low-cost device.

Further, since the guide layer and the conductive layer of the belt member are subjected to the water repellent treatment, the adhered ink, paper dust and the like can be surely removed. It is possible to reliably join the conductive layer and the power supply means, and to provide a device that can supply power stably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a paper feeding unit according to the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional perspective view of an electrode member of the transport belt according to the present invention.

FIG. 4A is a cross-sectional view of FIG. 3 as viewed from the direction of arrow a, and FIG. 4B is a cross-sectional view of FIG. 3 as viewed from the direction of arrow b; 3) is a partial cross-sectional side view of a power-supplied region of the electrode member of the transport belt according to the present invention.

FIG. 5 is a partial cross-sectional perspective view of an electrode member of a conveyor belt according to a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional perspective view of a third embodiment of an electrode member of a transport belt according to the present invention.

FIG. 7 is a sectional view of a conventional ink jet recording apparatus.

FIG. 8 is an enlarged view of a main part of a conventional ink jet recording apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 recording device 2 paper feeding unit 3 paper feeding unit 4 paper discharging unit 7 recording head 21 pressure plate 22 feed rotating body 24 spring 25 separation pad 26 separation claw 27 upper guide 28 lower guide 29 PE sensor lever 30 platen 31, 31 'belt Member 32 Conveying roller 33 Pinch roller 34 Drive roller 35 Pressure roller 36'a, 36'b Electrode member 36'C Base layer 36'D Surface layer 36'E1, 36'E2 Conductive member 38 Cleaning roller pair 39 Paper pressing member 41 Discharge Paper roller 42 spur 43 paper discharge tray 50 arm 51 spring 52 power supply member 53 support member 54 protection member 55 sealing member 80A, 80B, 80C mark P sheet material

Claims (9)

[Claims] 1. A conductive member comprising: a belt member having a plurality of layers; a plurality of pairs of belt members provided between layers of the belt member, a power-supplied region to which power is supplied from the outside, and an attraction force generating region that generates a potential difference. A transport belt comprising: a sheet member electrostatically adsorbed on a supporting surface of the belt member and capable of transporting the sheet material; wherein the belt member includes a base layer sandwiching the electrode member and the base layer. A dielectric layer made of a dielectric material on the supporting surface side, and a conductive region made of a conductive material joined to a power-supplied region of the electrode member and capable of supplying power from the surface of the belt member. And the conveyor belt. 2. The transport belt according to claim 1, wherein the surface of the sheet material made of the dielectric layer and / or the conductive region is subjected to a water-repellent treatment. 3. The transport belt according to claim 1, wherein the conductive regions are provided at both end portions in the transport belt moving direction. 4. The apparatus according to claim 1, wherein said plurality of pairs of electrode members are arranged in a comb-tooth shape in a direction orthogonal to a moving direction of the conveyor belt. The transport belt according to any one of the above. 5. An image forming unit which is arranged at a position facing the transport belt and forms an image based on image information, a power supply unit for supplying power to a conductive region on the power supply region, and a sheet material An image forming apparatus comprising: the conveying belt according to claim 1, which conveys the image. 6. A roller that is wound around at least one pair of transport rollers, is disposed at a position facing the transport belt,
6. A recording head for forming an image by flying ink on a conveyed sheet material, a power supply unit for supplying power to a conductive area on the power-supplied area, and conveying the sheet material. The conveyor belt according to any one of the above,
An image forming apparatus having: 7. The recording head according to claim 6, wherein a plurality of recording heads are arranged in the transport belt moving direction such that discharge ports for ejecting ink in a direction orthogonal to the transport belt moving direction are arranged. An image forming apparatus according to claim 1. 8. The image forming apparatus according to claim 6, wherein the recording head is a full line type recording head in which a plurality of recording elements are arranged over the entire width of a recording area of a sheet material. 9. The recording head according to claim 1, wherein the recording head performs recording by discharging ink by using thermal energy, and includes an electric heat energy converting unit for generating heat to be applied to the ink. The image forming apparatus according to any one of claims 6 to 8, wherein