JPH0243573A - Sheet carrier for color image forming device - Google Patents

Abstract

PURPOSE:To achieve stable image transferring without color slippage by providing a sheet screen which is stretched through tensile force imparting means and which can be electrified between a pair of holder bars and providing a positioning means regulating the holding position of an image carrying sheet with respect to the sheet screen. CONSTITUTION:A sheet holding means 46 regulates the holding position of the image carrying sheet 28 with respect to the sheet screen 51 by using the positioning means 50. The sheet screen 51 of the sheet holding means 46 is stretched between a pair of holder bars 47 and 48. The moving locus of the sheet holding means 46 is uniquely regulated by the holder bars 47 and 48 that are circulated and moved along a circulating and driving system 41 and placed before and behind each other. Moreover, tensile force is always imparted to the sheet screen 51 by the tensile force imparting means 52 and 55-57. Thus, images can be transferred excellently to the image carrying sheet 28 without color slippage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a sheet conveying device for a color image forming apparatus such as a color copying machine or a color printer. The present invention relates to an improvement in a sheet conveying device used in a color image forming apparatus equipped with a forming unit.

[Prior Art] As a conventional color image forming apparatus, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 143779/1983.

For example, as shown in FIG.
A charger 3 that charges the surface of the photosensitive drum 2 in advance, an optical system that writes a latent image according to image information on the charged surface of the photosensitive drum 2, a latent image writing means 4 such as a laser, and the photosensitive drum 2
a developing device 5 for developing the latent image formed thereon with toner of each color;
A transfer unit 6 such as a corotron that transfers the toner image on the photosensitive drum 2 onto the image bearing sheet 8 and a cleaner 7 that removes the residual toner on the photosensitive drum 2 after the transfer process are used for cyan, magenta, yellow, and black. The image forming units 1 (specifically, 1a to 1d) are appropriately arranged in the horizontal direction, and each image forming unit 1 is
The image bearing sheet 8 is sequentially conveyed to the toner image transfer site No.-1 at appropriate timing.

As shown in FIGS. 11 and 12, for example, a sheet conveying device 10 used in such an image forming apparatus has an endless belt that is movably looped between a driving roll 12 and a driven roll 13. The shaped belt 11 is provided with openings 14 corresponding to the image bearing sheets 8 at appropriate intervals, and mesh screens 1 are provided in the openings 14.
The image bearing sheet is electrostatically attracted to the mesh screen 15 by stretching the mesh screen 15 and charging the mesh screen 15 with an appropriate means.

[Problems to be Solved by the Invention] Incidentally, in the sheet conveying device of such a conventional color image forming apparatus, a means for positioning the image carrying sheet i-8 with respect to the mesh screen plate 5 is not provided. Therefore, the image bearing sheet 8 on the mesh screen 15
There is a possibility that the holding position of the image bearing sheet 8 may vary, and the image forming area of the image bearing sheet 8 may shift accordingly, resulting in a problem that the image quality will deteriorate.

Further, as a means for effectively preventing the endless belt 11 from becoming slack, a method is adopted in which the rigidity of the endless belt 11 is set to be relatively large. At this time, for example, the mesh screen 15 portion of the endless belt 11 is
2, as shown in FIG. 13, the mesh screen 15 and the rest of the endless belt 11
Due to the difference in rigidity between the mesh screen 15 and the other parts, the distal end side of the mesh screen 15, which has low rigidity, suddenly rises as shown by the arrow. For this reason, the posture of the image bearing sheet 8 entering the image transfer site of the image forming unit 1d is sharply inclined from the normal posture, and the moving speed of the image bearing sheet 8 at the image transfer site is slightly deviated. This results in a problem of color misalignment. Note that even immediately after the mesh screen 15 passes the driven roll 13, the rear end side of the mesh screen 15 rises rapidly, so that the image bearing seal l-8 does not reach the image transfer site of the first image forming unit 1a. The entry attitude suddenly changes from the normal attitude, causing problems similar to those described above.

Furthermore, in the above-described conventional sheet conveying device J3, even if the mesh screen 15 is stretched over the opening 14 of the endless belt 11 with an adhesive, tension is not actively applied to the mesh screen 15. Therefore, as shown by the arrow in FIG. 14, the center portion of the mesh screen 15 tends to loosen, and inevitably the image bearing sheet is electrostatically attracted onto the mesh screen 15. 8
Distortion also occurs, leading to a loss of transferred image quality.

The present invention has been made in view of the above-mentioned problems, and is capable of conveying an image-bearing sheet to the image transfer site of each image-forming unit in a normal posture and accurately positioned, thereby preventing misalignment. The present invention provides a sheet conveying device for a color image forming apparatus that is capable of performing stable image transfer without any image transfer.

[Means for Solving the Problems] That is, the present invention sequentially conveys an image-bearing sheet to each image-forming site of a plurality of image-forming units corresponding to appropriate color components, and forms an image of each color component on the image-bearing sheet. The premise is a sheet conveying device of a color image forming apparatus that performs overlapping transfer, and a circulation drive system that circulates and moves between locking members at both ends, and an image forming portion of each image forming unit by this circulation drive system. The sheet holding means is comprised of a pair of holder bars that are constructed in accordance with the length of the image bearing sheet in front and back of the traveling direction of the circulation drive system, and a pair of holder bars that are installed between the front and rear holder bars. The sheet screen is provided with a sheet screen that is stretched through a tension applying means and can be charged so that the image bearing sheet is electrostatically attracted thereto, and a positioning means that regulates the holding position of the image bearing sheet with respect to the sheet screen. .

In such technical means, each image forming unit °C is a drum-shaped or belt-shaped latent image carrier made of a photoconductor, a dielectric material, etc., and a latent image formed on this latent image carrier. Forming means, developing means for developing the latent image on the latent image carrier with toner, latent image! An electrophotographic type equipped with a transfer means for transferring the f3 toner image on the torso to an image bearing sheet, and one in which an image is formed on an image bearing sheet using a thermal recording head or an inkjet recording head, etc. Various methods are included. Also, the number of image forming units,
As for the arrangement, an appropriate number can be selected as long as it can form an image with appropriate color components such as cyan, magenta, yellow, and black, and the selected ones can be arranged horizontally or vertically in any combination. Can be done.

In addition, examples of the circulation drive system that is a component of the sheet conveying device include an endless chain or a system in which the endless bell 1 is suspended between locking members at both ends, and the endless chain or the like is appropriately circulated. In this case, one of the C1 locking members may be used as a driving member and the other as a driven member to circulately move the endless chain, or another drive system may directly drive the endless chain, etc. You may also let them do so.

Further, the number of sheet holding means may be one, but in view of the need for higher speed, a plurality of sheet holding means may be provided so that each image forming unit performs the image transfer process on a different image bearing sheet. is preferred. Further, as the tensioning means, the design may be changed as appropriate as long as it can apply tension to the extent that the sheet screen does not loosen by using springs, weights, or the like. and again,
The sheet screen may be appropriately selected as long as it is made of a chargeable dielectric material, but if the sheet screen itself lacks surface rigidity, for example, the periphery of the sheet screen may be It is preferable to design it so that it is reinforced with a rectangular reinforcing frame.

Further, as the positioning means, for example, a gripper that opens and closes as appropriate may be provided on the front holder bar, and this gripper may hold the leading edge of the image bearing sheet, or the front holder bar may hold the leading edge of the image bearing sheet. Although the design may be changed as appropriate, such as simply arranging a contacting positioning member, from the viewpoint of accurately positioning the image bearing sheet on the sheet screen, a method using a gripper is preferable.

Furthermore, when the image forming unit is disposed near the both end locking members, the image bearing sheet passes through the image transfer portion of the image forming unit at the stage when the leading end side or the intrusive end side of the sheet holding means passes through the locking members. Because of the positional relationship,
It is necessary to take measures to maintain the sheet screen in its normal position at least at the image transfer site, such as providing a guide member at a location corresponding to the locking member in order to gradually change the position of the sheet screen. .

In this case, if the guide member and the holder bar interfere due to their positional relationship, it is necessary to perform interference prevention treatment such as providing a groove into which the holder bar fits on the guide member side.

[Operation] According to the technical means as described above, the sheet holding means of the sheet conveying device regulates the holding position of the image bearing sheet with respect to the sheet screen using the positioning means.

Furthermore, since the sheet screen of the sheet holding means is stretched between the pair of holder bars, the movement locus of the sheet holding means is uniquely regulated by the front and rear holder bars that circulate along the circulation drive system. , the sheet screen passes through the image transfer site of each image forming unit in a normal posture.

Furthermore, since tension is constantly applied to the sheet screen by the tension applying means, the sheet screen does not become unnecessarily slack.

[Embodiments] Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

Figure 1 shows the application of the present invention to a vertical full-color printer, which is designed to form images of each color component of cyan, magenta, yellow, and black in order from the bottom along a substantially vertical direction. Four image forming units 20 (specifically, 20a to 20'd) arranged in an array, and a sheet conveying device that sequentially conveys an image bearing sheet 28 to the image forming site of each image forming unit 20 arranged in a substantially vertical direction. It consists of 40.

In this embodiment, each image forming unit 20 includes a photosensitive drum 21, a charger 22 that charges the surface of the photosensitive drum 21 in advance, a laser 24 that irradiates a laser beam according to image information, and a beam from the laser 24. It consists of a polygon mirror 25 that deflects the beam in the scanning direction, and an imaging lens 26 that forms an image of the beam deflected by the polygon mirror 25 on the photosensitive drum 21, and writes a latent image according to image information on the charged surface of the photosensitive drum 21. a developing device 27 that develops the latent image formed on the photosensitive drum 21 with toner of each color, and a transfer device 29 such as a corotron that transfers the toner image on the photosensitive drum 21 onto an image bearing sheet 28. , and a cleaner 30 for removing residual 1 to toner on the photosensitive drum 21 after the transfer process.

A sheet feeding cassette 31 in which the image bearing sheet 28 is accommodated is provided in a body part corresponding to the lower side of the sheet conveying device 40, and the image bearing sheet 28 from this sheet feeding cassette 31 is transferred to a feeding roll. 32 at a predetermined timing, and is supplied to the sheet supply section A located at the lowest position of the sheet conveying device 40 via the supply side guide chute 33. Further, a housing tray 34 for the image bearing sheet 28 is provided in a body part corresponding to the upper side of the sheet conveying device 40.
The image-bearing sheet 28 separated at the sheet separation portion B located at the top of the sheet passes through a fixing device 36 via a discharge-side guide chute 35, and then is discharged to the storage tray 34.

Further, as shown in FIGS. 2 to 5, the sheet conveyance device 40 includes an endless circulation drive system 41 and four locations of the circulation drive system 41 that selectively move the image bearing sheet 28. A sheet holding means 46 for holding the sheet is provided.

That is, as shown in FIG. 5 in particular, the circulation drive system 41 includes a pair of drive sprockets 43 arranged on the upper side of the fuselage body and rotated as appropriate by the drive motor 42, and a pair of drive sprockets 43 arranged on the lower side of the fuselage body. A pair of driven sprockets 44 that rotate naturally, a driving sprocket 43 and a driven sprocket 4
It is composed of an endless chain 45 that is stretched between 4 and 4.

On the other hand, the sheet holding means 46 has a pair of holder bars 47 and 48, which are installed on the endless chain 45 at the front and back in the traveling direction of the circulation drive system 41, as shown in FIGS. 2 and 3 in particular, An appropriate number of openings 49 are formed in the front holder bar 47, and a gripper 50 having a cam protrusion goa on the back side is attached to the opening 49 while being biased in the closing direction by a spring member (not shown). The surface side holder bar 47 has a mesh-like sheet screen 5 that functions as an image bearing sheet 28 f7 holding surface.
1 and fix the tip of this sheet screen 51.
A locking bar 52 is attached to the rear end side, and a pair of insertion holes 5 are provided in the locking bar 52 and the rear holder bar 48, respectively.
3 and 54, and a locking rod 55 having one end formed with a locking portion 55a capable of locking with the locking bar 52 is inserted into each insertion hole 53, 54 so as to be freely retractable. A weight 56 is fixed to the tip of the weight 55.
A coil-shaped balance spring 57 is interposed between the balance spring 6 and the rear holder 48. In this embodiment, as particularly shown in FIG. 4, the distances L1 to L4 between the tips of the respective sheet holding means 46 are set to be equal.

Further, at locations corresponding to the drive sprocket 43 and driven sprocket 44, as shown in FIGS. 5 and 6, a drive side guide drum 61 and a driven side guide drum 62 are disposed coaxially with each sprocket 43, 44. In the longitudinal direction of the peripheral surface of each guide drum 61 and 62, grooves 63 (specifically, 63a and 63b) for preventing interference when the front and rear holder pars 47 and 48 of the sheet holding means 46 pass are provided as appropriate. In addition, a plurality of cut grooves 64 (specifically, 64a, 64b) are formed on the circumferential surface of each guide drum 61, 62 corresponding to the position of the gripper 50 of the sheet holding means 46.
) is formed. And each guide drum 61.62
A rotatable cam shaft 65 (specifically, 65a
, 65h), and each cam shaft 65 is provided with a cam 66 (specifically, a cam 66a) which is placed on one end side at the position of the cut groove 64.

66b) is attached to each cam 66, and the gripper 5 is attached to each cam 66.
A cam surface 67 for temporarily opening the gripper 50 by engaging with the cam projection 50a of the gripper 50 is formed. Incidentally, reference numeral 68 is a biasing spring for pressing the cam 66 toward the cut groove 64 side.

Furthermore, in this embodiment, a screen charger 71 is provided to charge the sheet screen 51 in advance before the image bearing sheet 28 is held by the sheet holding means 46, and the image bearing sheet 28 is electrostatically charged on the sheet screen 51. Each image forming unit 2
Behind each transfer site of 0, a static eliminator 72 (specifically, 7
2a to 72d) are disposed, and furthermore, a screen static eliminator 73 for removing the charged state of the sheet screen 51 is disposed at the point where the final stage transfer process is completed.

Next, the operation of the full color printer according to this embodiment will be explained.

When a start switch (not shown) is turned on to operate the color printer, each image forming unit 20 starts operating at a desired timing, and the sheet conveying device 40 starts operating.

At this time, first, the image bearing sheet 28 in the sheet feeding cassette 31 is sent out by the feeding roll 32 at a predetermined timing and is supplied to the sheet feeding section A. Then, as particularly shown in FIG.
The cam protrusion 50a of the gripper 50 moves in sliding contact with the cam surface 67 of the cam 66b, and when the gripper 50 is temporarily released, the tip of the image carrying sheet 28 is guided to the gripping position of the gripper 50, When the cam protrusion 50a passes over the cam 66b, the gripper 50 grips the image bearing sheet 28.
Hold the tip of the Then, the image bearing sheet 28 held by the gripper 50 is electrostatically attracted to the sheet screen 51 which is charged in advance, and the sheet holding means 4
6 securely holds the image bearing sheet 28.

In this state, the front and rear holder pars 47 and 48 pass through the driven side guide drum 62, but since each holder par 47 and 48 is accommodated in the interference prevention groove 63b of the driven side guide drum 62, the seat The holding means 46 and the driven guide drum 62 do not interfere with each other. Further, the gripper 50 is temporarily opened at the sheet supply portion A, but the opening force F (see FIG. 1) of the gripper 50 acts in the substantially vertical direction of the endless chain 45, so that the endless chain 45 There is no unnecessary vibration.

Further, the sheet screen 51 is connected to the driven side guide drum 6.
Since the sheet screen 51 is guided and conveyed by the circumferential surface of the sheet screen 2, the sheet screen 51 that has passed the driven side guide drum 62 is immediately set in a substantially vertical direction, as shown by the imaginary line in FIG. Therefore, the image-bearing sheet 28 held by this sheet screen 51 by suction is also set to a substantially vertical posture immediately after passing the driven side guide drum 62, and the cyan image forming unit 20a is guided on the driven side. Even if it is arranged close to the drum 62, the image bearing sheet 28 will enter the transfer site T in a substantially vertical normal position, and the driven sprocket 44 of the circulation drive system 41 and the cyan image forming unit will be affected accordingly. 20a can be set short.

As shown in FIG. 1, the sheet holding means 46 holding the image bearing sheet 28
Each transfer site T from 0a to 20d is sequentially moved approximately vertically from the lower side to the upper side, and at each transfer site T, the toner image of each color component on the photosensitive drum 21 is transferred to the image bearing sheet 28. .

In this operation process, as shown in Figure 1,
Since the endless chain 45 that is stretched around the drive block 1 is basically placed approximately vertically downward due to its own weight,
In particular, even if a relatively large tension is not applied to the endless chain 45, the vertical portion of the endless chain 45 will not bend unnecessarily.

Therefore, there is no concern that a large load torque will act on the drive motor 42, and it becomes possible to use a small drive motor 42 for small torque.

Further, the sheet screen 51 is basically arranged along its own weight direction (approximately vertically downward direction), and is further forcibly stretched approximately vertically downwardly by the weight of the weight 56 and the biasing force of the balance spring 57. , the posture of the sheet screen 51 is reliably maintained in the substantially vertical direction. Therefore, the image bearing sheet 28 held by suction on the sheet screen 51 enters each transfer site in a normal posture at all times, and the position between the image bearing sheet 28 and the photosensitive drum 21 is maintained at all times. The gap δ deepens constantly. Therefore, at each transfer site T, slippage in the process direction between the photosensitive drum 21 and the image bearing sheets 1 to 28 does not occur, and poor contact between the image bearing sheet 28 and the photosensitive drum 21 does not occur. 1 on each photosensitive drum 21
- The toner image is uniformly transferred to the image bearing sheet 28 in good condition, and a transferred image without color shift is obtained.

Further, in this embodiment, since the sheet holding means 46 are arranged at regular intervals, the left and right weight balance with respect to the driving sprocket 43 of the sheet conveying device 40 is kept substantially constant.

Therefore, even if each sheet holding means 46 moves sequentially, the load on the drive motor 42 does not change.
Unstable operation due to load fluctuations of the sheet conveying device is effectively prevented.

In addition, in this embodiment, since the image bearing sheet 28 that has passed through each transfer site is charged by the static eliminator 72, the image bearing sheet 28 may be excessively charged in the subsequent transfer process and the transfer quality may be impaired. A situation in which charges remain on the image bearing sheet 28 discharged after each transfer step is effectively avoided.

Furthermore, the sheet holding means 46 that has passed through the transfer site T of the black image forming unit 20d moves to the sheet separation site B, particularly as shown in FIG. At this time,
The charge on the sheet screen 51 of the sheet holding means 46 is removed by the screen static eliminator 73, and then the cam protrusion 50a of the gripper 50 of the sheet holding means 46 slides into contact with the cam 67 of the cam 66a. ,
Gripper 50 is temporarily opened. Then, gripper 5
The image bearing sheet 1-28, which is no longer held by the image bearing member 0, moves to the discharge side guide chute 35, passes through the fixing device 36, and is then discharged and stored in the discharge tray 34.

During this operation process, the front and rear holder pars 4
7.48 passes through the driving side guide drum 61 portion, but since each holder par 47.48 is accommodated in the interference prevention groove 63a of the driving side guide drum 61, the sheet holding means/! 6 and the driving side guide drum 61 do not interfere with each other. Further, the gripper 50 is located at the sheet separation portion B.
However, since the opening force F' (see Fig. 1) of the gripper 50 acts in the substantially vertical direction of the endless chain 45, the endless chain 45 does not move unnecessarily. . Furthermore, the sheet screen 51
Since the sheet screen 51 is guided and conveyed sequentially from the leading end side to the circumferential surface of the drive side guide drum 61, the rear end side of the sheet screen 51 that does not reach the drive side guide drum 61 is held in a substantially vertical posture. Therefore, the image bearing sheet 28 at a position close to the driving side guide drum 61 is set in a substantially vertical posture, and the black image forming unit 28 at the top stage
Even if d is placed close to the drive-side guide drum 61, the rear end side of the image-bearing sheet 28 will pass through the transfer region T in a substantially vertical normal position, and the drive sprocket of the circulation drive system 41 will be affected accordingly. The distance E between the image forming unit 43 and the black image forming unit 20d can also be set short.

Furthermore, in this embodiment, since the image forming units 20 are arranged in a substantially vertical direction, it is possible to secure a work space in the horizontal direction for arranging unit parts such as the photosensitive drum 21 and the laser scanning system 23. Therefore, installation work and maintenance inspection work for the unit parts of the image forming unit 20 can be easily performed.

In this embodiment, the sheet screen 51 is composed of a mesh-like single sheet, but as shown in FIG. 10, the sheet screen 51 is made of a thin insulating resin having a certain degree of rigidity, Polyethylene terephthalate (trade name Mylar) film and SUS
By reinforcing one sheet with a rectangular frame 58 made of material or the like, the surface rigidity of the sheet screen 51 can be further increased.

[Effects of the Invention] As described above, according to the sheet conveying device of the color image forming apparatus according to claims A to C, the sheet screen of the sheet holding means is always properly moved to the image transfer site of each image forming unit. Since the sheet screen can be passed in the same position, and the sheet screen is equipped with a means to prevent loosening, the moving speed of the image bearing sheet held on the sheet screen may be slightly shifted or the image bearing sheet may be distorted. Accordingly, it is possible to perform good image transfer without color shift to the image-bearing sheets 1 to 1, and also to transfer the image-bearing sheet to the sheet screen of the sheet holding means. Since accurate positioning is possible, misalignment of the image transfer area with respect to the image bearing sheet can also be effectively avoided.

Furthermore, according to the sheet conveying device of the color image forming apparatus according to claim 2, the sheet screen of the sheet holding means is guided by the drum-shaped guide member and gradually changes its posture, so that the sheet screen portion located outside the guide member position is Since the posture of the sheet screen is maintained in the normal posture, even if the final stage or the first image forming unit is placed close to each other near the locking members at both ends, the posture of the sheet screen passing through the image forming area will not change. There is no risk of deviation from the normal position, and the image bearing sheet can always be guided to each image transfer site in a normal position. Therefore, the dimension between the locking members at both ends can be set short, and the device can be made smaller accordingly.

Furthermore, according to the sheet conveying device of the color image forming apparatus according to claim 3, the rigidity of the peripheral edge of the sheet screen can be increased, so that the surface rigidity of the sheet screen itself can be slightly increased, and the rigidity of the sheet screen itself can be increased. Therefore, loosening of the sheet screen can be more reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a sheet conveying device of a color image forming apparatus according to the present invention, FIG. 2 is a perspective view showing details of a sheet holding means used in the embodiment, and FIG. 4 is an explanatory diagram showing the arrangement positional relationship of the sheet holding means used in the example, and FIG. 5 is a detailed view of the gripper opening/closing mechanism of the sheet holding means used in the example. FIG. 6 is a view taken from the arrow direction in FIG.
FIG. 10 is an explanatory diagram showing a modified example of the sheet holding means used in the embodiment, FIG. 11 is an explanatory diagram showing an example of a sheet conveying device of a conventional color image forming apparatus, and FIG. 12 is a perspective view of the main part thereof. , Figure 13 is a detailed view of section X in Figure 11,
FIG. 14 is a sectional view taken along the line XrV-XIV in FIG. 12. [Explanation of symbols] 20--Image forming unit 28-Image bearing sheet 40-Sheet conveyance device 41-Circulation drive system 43-Drive sprocket (locking member) 44-Driven sprocket (Locking member) 45... Endless chain 46... Sheet holding means 47.48... Holder bar 50... Gripper 51... Sheet screen 52... Locking bar (tension applying means) 55 ... Locking rod (tension applying means) 56 ... Weight (tension applying means) 57 ... Balance spring (tension applying means) 58.
...Rectangular frame 61.62...Guide drum (guide member) Patent applicant
Fuji Xerox Co., Ltd. Representative Patent Attorney Tomohiro Nakamura (3 others) Funeral diagram for Rodsudo, 55th grader, Figure 11, Figure 12

Claims (1)

[Claims] 1) A plurality of image forming units (2) corresponding to appropriate color components;
In a sheet conveying device of a color image forming apparatus, which sequentially conveys an image bearing sheet (28) to each image forming site of 0) and transfers images of each color component onto the image bearing sheet (28) in an overlapping manner, A circulation drive system (41) that circulates between the stop members (43, 44), and each image forming unit (41) is operated by this circulation drive system (41).
20) Sheet holding means (
46), and the sheet holding means (46) comprises the circulation drive system (41).
), a pair of holder bars (47, 4
8) and a sheet that is stretched between the front and rear holder bars (47, 48) via tension applying means (52, 55, 56, 57) and that can be charged to electrostatically attract the image bearing sheet (28). a screen (51); and a positioning member (50) for positioning the image bearing sheet (28) to be electrostatically attracted to the sheet screen (51).
) A sheet conveying device for a color image forming apparatus, comprising: 2) The device according to claim 1, wherein the locking member (43
, 44), there is a sheet screen (51)
Drum-shaped guide members (61, 62) that serve as movement guide surfaces for
A sheet conveying device for a color image forming apparatus, characterized in that a sheet conveying device is provided with a color image forming apparatus. 3) The product according to claim 1, wherein the sheet screen (
A sheet conveying device for a color image forming apparatus, characterized in that the peripheral edge of the sheet screen (51) is reinforced with a rectangular frame (58) that is more rigid than the sheet screen (51).