CN1758158A

CN1758158A - Sheet turn-over device and imaging forming device

Info

Publication number: CN1758158A
Application number: CNA2005101051904A
Authority: CN
Inventors: 阿形淳
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2004-10-04
Filing date: 2005-09-30
Publication date: 2006-04-12
Also published as: JP2006103855A; US20060181003A1

Abstract

In a sheet reversing unit, an attraction belt is supported, in a 180 DEG twisted position, between a belt driving roller at a conveying start position and a belt driving roller at a conveying end position, and a sheet is conveyed by providing the attraction belt with an electrostatic force from an AC power supply and thus by being attracted to the attraction belt, whereby the sheet is reversed.

Description

Sheet turn-over device and image processing system

Technical field

The present invention relates to the image processing system and more particularly such as copy device, printer or facsimile unit, relate to the device that is used for upset thin slice under the situation of thin slice double-face imaging.

Background technology

Known image forms device, for example duplicating machine, printer or facsimile recorder, and it is provided with the pattern (hereinafter be called dual-side image and form pattern) that all forms image on the front and back of thin slice.In this dual-side image formation pattern, by by the sheet turn-over device upset thin slice that is arranged in the image processing system, the image that is implemented on the two sides of thin slice forms.

Figure 10 is a side view cutaway drawing, shows the structure of the previous zigzag sheet turn-over device that is provided with into dual-side image formation pattern.

Sheet turn-over device 100b is provided with: the conveying 101 that is used for receiving from image processing system 100a thin slice; Be used for after image forms, thin slice being discharged to the conveying 103 of device outside; And the conveying 104,107,110 of the received thin slice that is used to overturn.

The conveying 101 that receives thin slice from image processing system 100a is branched to conveying 103 or conveying 104, and movable lug retaining 108 is arranged on the bifurcation that is used to control the thin slice working direction, and thin slice is advanced by conveying roller 102.

Conveying 104 is provided with conveying 107 and to the bifurcation of conveying 110, and movable lug retaining 109 is arranged on the bifurcation that is used to control the thin slice working direction, and thin slice is advanced by twist rollers 105.Conveying 110 is provided with conveying roller 106, and conveying roller 106 advances the thin slice that is reversed towards image processing system 100a.

Next, will be explained in thin slice switching process among the previous image turning device 100b.In image processing system 100a, image formation and image fixing are after one side, and thin slice is transported to sheet turn-over device 100b through conveying 101.Under this state, the movable lug retaining 108 that is arranged on conveying roller 102 bifurcation places opens conveying 104 and cuts out conveying 103.Thereby thin slice arrives conveying 104 by the rotational conveyance of conveying roller 102.

When thin slice was transported to conveying 104, the movable lug retaining 109 that is arranged on the bifurcation place of twist rollers 105 cut out conveying 110, thereby thin slice is advanced to conveying 107 by conveying 104 and by twist rollers 105.When the tail end of thin slice kept off 109 by movable lug, twist rollers 105 stopped.

After twist rollers 105 stopped, movable lug retaining 109 cut out conveying 104 and opens conveying 110.Then, twist rollers 105 is along counter-rotation, and thin slice being advanced to conveying 110, and thin slice is transported to image processing system 100a by conveying roller 106.Thereafter under dual-side image forms situation on the back side that pattern is formed on image thin slice, repeat aforesaid operations.

In this zigzag sheet turn-over device, in order to change the direction of thin slice, roller is stopped and reversing, therefore cause losing time.

In addition, be used for temporarily keeping the track segment of thin slice occupied, pass through this guide rail until whole thin slice, thereby need the longer time, and the production efficiency of duplex printing process be difficult to raising for long thin slice at change web direction place.

For fear of this shortcoming, the sheet turn-over device of another kind of type is disclosed among Japanese Patent Application No.11-207927 or the Japanese Patent Application No.2002-20000 (USP 2002069774A).

In the invention that please communique No.11-207927 in being disclosed in Jap.P., thin slice is by the sheet-conveying device clamping with gripper jaw, and this sheet-conveying device is directed along the transport path with Mebius belt shape, with the upset thin slice.

Yet, in this kind sheet turn-over device that thin slice is directed along the transport path with Mebius belt shape, because thin slice is held the pawl clamping, the vestige of gripper jaw is formed on sheet surface, and thin slice trends towards in course of conveying causing and flapping being different from a part by the part of gripper jaw clamping, thereby causes the damage of thin slice.

In addition, in the invention that is disclosed in Japanese Patent Application No.2002-20000, each is two of 180 ° of intersections and is with 7,8 to be arranged between the

deflection guide reel

3,4,5,6, and thin slice is clamped in two and is with between 7,8, and carries under half-turn.

In addition, in this kind structure,,, must improve holding force, and the holding force of this increase may cause occurring on tape vestige with 7,8 in order to realize not having the conveying of thin slice deviation because thin slice S only is with 7,8 clamping and conveyings by two.In addition, thin slice trends towards in course of conveying causing and flapping being different from a part by the part of gripper jaw clamping, thereby causes the damage of thin slice.

Summary of the invention

The purpose of this invention is to provide and a kind ofly can improve the thin slice switching process and can obtain the upset of stable thin slice and do not damage the sheet turn-over device of thin slice.

According to the present invention, can realize aforementioned purpose by sheet turn-over device, sheet turn-over device comprises: conveying belt is used to carry thin slice; Drive unit, it drives conveying belt; And adsorbent equipment, its absorption thin slice is to conveying belt, and wherein, the chip sorption surface of conveying belt has distortion between conveying starting position and conveying end position, thus the thin slice of carrying is reversed predetermined angular.

In sheet turn-over device of the present invention and image processing system, because the surface of conveying belt is twisted predetermined angular and thin slice and is adsorbed on this conveying belt and carries carrying the starting position and carry between the end position, can reduce the required time of thin slice upset, thereby improve the throughput rate of dual-side image forming process.In addition, because thin slice is not by local clamping but all absorption when carrying, the device that forms the transport path upset thin slice of mebius belt shape with previous edge is compared, and can the clamping vestige for example occur on thin slice so that avoid poor print quality.In addition, because can end thin slice flapping in conveying in advance, can improve the stability that thin slice is carried.

Description of drawings

Fig. 1 is a side view cutaway drawing of realizing image processing system of the present invention;

Fig. 2 is the skeleton view as the sheet turn-over device of the present invention of roll-over unit;

Fig. 3 is a vertical view of realizing roll-over unit of the present invention;

Fig. 4 is a side view of realizing roll-over unit of the present invention;

Fig. 5 is a side view, is illustrated in the conveying starting position of realizing in the roll-over unit of the present invention;

Fig. 6 is a side view, is illustrated in the conveying end position of realizing in the roll-over unit of the present invention;

Fig. 7 is a side view, illustrates from the other method of adsorption band 33 separating slices of embodiment;

Fig. 8 is the skeleton view of roll-over unit in the thin slice course of conveying of embodiment;

Fig. 9 is a skeleton view, and another example of the roll-over unit of embodiment is shown;

Figure 10 is the side view cutaway drawing of previous zigzag sheet turn-over device; And

Figure 11 is the skeleton view that another previous sheet turn-over device is shown.

Embodiment

Below, realize sheet turn-over device of the present invention and image processing system with reference to Fig. 1 to 8 explanation.

Fig. 1 is a side cutaway view of realizing image processing system of the present invention; Fig. 2 is the skeleton view as the sheet turn-over device of the present invention of roll-over unit; Fig. 3 is a vertical view of realizing turning device of the present invention; Fig. 4 is a side view of realizing turning device of the present invention; Fig. 5 is illustrated in the side view of realizing the conveying starting position in the turning device of the present invention; Fig. 6 is illustrated in the side view of realizing the conveying end position in the turning device of the present invention; Fig. 7 is the side view that illustrates from the another kind of method of adsorption band 33 separating slices of this embodiment; And Fig. 8 is the skeleton view of roll-over unit in the thin slice course of conveying of this embodiment.

Image processing system 1 is made of following: manuscript reading section 2, and the original copy that is used to read book for example or file is as symbol data or view data; Image forming part 3 is used for going up the image that forms the view data that is read by manuscript reading section 2 at thin slice (copy paper or glazed paper) by transfer printing; Feeding portion 5, being used for feeding will be at the thin slice of image forming part 3 uses; Photographic fixing portion 6 is used for photographic fixing and is transferred to toner image on the thin slice in image forming part 3; And two-sided 7, be used under the situation of duplex printing, carrying out the upset of thin slice.

Manuscript reading section 2 is provided with has the optical scanning portion 10 of illuminating the light source that is placed on the original copy on the document board 8.The reflected light that is produced by this illumination is reflected one by one by the catoptron that is arranged in the manuscript reading section 2, is guided through reducing glass 11 then, and is read by for example imageing sensor of CCD 12.The light that is read by CCD 12 carries out opto-electronic conversion, and so the view data that obtains is changed and Flame Image Process through A/D, and outputs to storer or hard disk (not shown).

Image forming part 3 is provided with laser cell 13, the view data that its basis is read by manuscript reading section 2, emission of lasering beam under laser driver control.Laser beam is fallen on the unshowned polygon prism, and the rotation by polygon prism, along the bus scanning photosensitive drums 15 of photosensitive drums 15.This scan exposure on the surface of photosensitive drums 15 forms electrostatic latent image, and this photosensitive drums 15 is in advance by charger 16 chargings.

Electrostatic latent image is developed on the photosensitive drums by developing apparatus 17, and the toner image that produces is transferred on the thin slice by transfer printing charger 19.The remaining toner that remains in after the image transfer printing on the photosensitive drums 15 is removed by cleaning device 20.Charger 16, developing apparatus 17, transfer printing charger 19 and cleaning device 20 be positioned at photosensitive drums 15 near, and be disposed in order according to this along the rotation direction of photosensitive drums 15.

In image processing system 1, the mechanism that is used for four kinds of colors of cyan, magenta, yellow and black in turn arranges, and is transferred according to the image overlay ground that each view data of color differentiating forms, with the acquisition coloured image.

In feeding portion 5, be provided with the thin slice box 21 that is used to pile up thin slice, it is removably mounted on the bottom of image processing system 1.In position near thin slice box 21, be provided with pick-up roller 22, and the unshowned solenoid that is connected to pick-up roller 22 is switched in the armed state of thin slice feeding, pick-up roller 22 is separated with sheet surface thus.

When the thin slice feeding was operated, solenoid was disconnected, so that pick-up roller 22 contacts with uppermost thin slice.The thin slice that contacts with pick-up roller 22 is by the driving feeding of pick-up roller 22.In this state, by rotating pick-up roller 22 from the driving force that conveying roller 23 transmits by synchronous belt.The thin slice that is driven by pick-up roller 22 is by conveying roller 23 and reduction roll 25 clampings and conveying.Make reduction roll 25 when the direction opposite with the thin slice throughput direction rotated by unshowned torque limiter, conveying roller 23 rotates along the throughput direction of thin slice.

Thereby when only carrying a thin slice, owing to have only a thin slice to be clamped between two rollers, the friction force between thin slice and roller has overcome the driving force of torque limiter to reduction roll 25, so reduction roll rotates along throughput direction.

Under the situation that two or more thin slices advance overlappingly, when the clip position that arrives between conveying roller 23 and the reduction roll 25, friction force between thin slice just becomes and is weaker than the power of torque limiter, reduction roll 25 rotates along the direction opposite with throughput direction thus, and has only the separated and feeding in advance of uppermost thin slice in a plurality of thin slices.

Like this, advance simultaneously at pick-up roller 22 under the situation of a plurality of thin slices, aforementioned functional makes only separates in these a plurality of thin slices and advances uppermost thin slice, and the thin slice that is stacked on thus in the thin slice box 21 can be carried one by one.Then, the thin slice that so separates is transported to thin slice location division 9.

Photographic fixing portion 6 is provided with and is used for fixing roller 26 and the pressure roll 27 of toner image to the thin slice, and, when carry transfer printing the thin slice of toner image by travelling belt 32 when image forming part 3 is carried, fixing roller 26 and pressure roll 27 apply heat and pressure to thin slice, thus with toner image to thin slice.

After this photographic fixing in photographic fixing portion 6 is handled, form in normal image under the situation of pattern (single face image formation pattern), thin slice is discharged to the outside of image processing system 1 by paired distributing roller 4.

On the other hand, form at dual-side image under the situation of pattern, after by fixing roller 26 and pressure roll 27, thin slice is transported to two-sided 7.

The thin slice that is transported in two-sided 7 passes through two-sided transport path 29, and is directed in the double surface unit (sheet turn-over device) 30.Then, for multiimage forms, thin slice is transported to thin slice location division 9 by feed rolls 31 again, then, and to be discharged to the outside of image processing system 1 with mode identical under one-sided image formation pattern.

Below roll-over unit 30 will be described, it is as the sheet turn-over device in the present embodiment.

In roll-over unit 30, be supported between band driven roller of locating the conveying starting position 35 and the band driven roller 36 of the carrying the end position place as the adsorption band 33 of used for conveyer belt of the present invention in absorption and conveying thin slice.On the chip sorption surface of adsorption band 33 of the position of band driven roller 35 positions that are in from 180 ° of the position distortions on the chip sorption surface of the adsorption band 33 of the position of band driven roller 36.More specifically, face down, and face up on the chip sorption surface of the adsorption band 33 of the position of band driven roller 36 on the chip sorption surface of adsorption band 33 of the position of band driven roller 35.

In the present embodiment, the chip sorption surface is twisted 180 °, but this angle can suitably be selected as required.

Also carry the place, starting position at thin slice, pressure roll 39 clips adsorption band 33 and is with driven roller 35 relative.Pressure roll 39 applies specific biasing force to band driven roller 35, and the thin slice that is transported to roll-over unit 30 thus is adsorbed is with 33 absorption.The biasing force that is applied to band driven roller 35 can be aspect size and applying method, for example according to the type of thin slice, by solenoid or Electric Machine Control.

In addition, support roller 37 is arranged on the substantial middle place of band driven roller 35 and band driven roller 36, and in the inboard of supported adsorption band 33, for fear of its phase mutual friction.

Although be omitted in the present embodiment, drive by the drive unit such as motor as the band driven

roller

35,36 of drive unit of the present invention, so that adsorption band 33 rotates with predetermined speed.In addition, the transportation performance of band may be enhanced, for example by forming rib on the end of adsorption band 33 or being provided for regulating the catanator of the aligning of adsorption band 33 by in band driven

roller

35,36 any.

On the other hand, in order to make chip sorption to adsorption band 33, used adsorption band charged electrostatically device.For the electrostatic charging of adsorption band 33,, supplying with band driven

roller

35,36 and support roller 37, thereby provide electrostatic force to adsorption band 33 with electric current as the charging control section 40 control AC power supplies 41 of as shown in Figure 2 control device of the present invention.Can use the DC power supply and supply with band driven

roller

35,36 and support roller 37 electric currents, thereby provide electrostatic force to adsorption band 33.

As mentioned above, drive to band and to send

roller

35,36 and support roller 37 that electric current is provided,, still,, just do not need to provide electric current to all these members as long as can in adsorption band 33, obtain the electrostatic force of necessary absorption affinity to obtain electrostatic force.

In addition, according to the type (for example weight of unit area, rigidity, thickness or the like) of thin slice, the required absorption affinity of absorption thin slice is variable.Therefore, can be by in charging control section 40, reducing power consumption according to the thin slice type control absorption affinity that will use.Also can be by the thin slice that is transferred with the identification of unshowned sensor or analog, and reduce power consumption by the absorption affinity of controlling each thin slice.

Below, will the function of the roll-over unit 30 of present embodiment be described.

Thin slice is carried between inlet conveying 42a, 42b, and is adsorbed below adsorption band 33 by the charge function of band driven roller 35.The thin slice that is adsorbed to adsorption band 33 is directed into the conveying end position along the distorted shape of adsorption band 33.

At the conveying end position of roll-over unit 30, outlet conveying 43a, 43b are arranged to the position of facing mutually as shown in Figure 6.Jump up when from adsorption band 33 separation to cause bad thin slice conveying for an end that prevents thin slice, outlet conveying 43a is provided with the covering that length is L.

Thin slice only separates from adsorption band 33 by the rigidity that is adsorbed on the thin slice on the adsorption band 33, and this has utilized the adsorption band of being determined by the external diameter of band driven roller 36 33 in the curvature of carrying end position and the resistance to bending (passing through flex apart) of thin slice.More clearly, have the rigidity bigger by adsorption band 33 absorption and the thin slice carried, thereby thin slice can not carry end position to change direction, and separate from the absorption surface of adsorption band 33 than the absorption affinity of adsorption band.

Fig. 7 illustrates another exemplary method that is used for from adsorption band 33 separating slices.

Electric charge is eliminated pin 45 and is carried out separation by the absorption affinity that reduces adsorption band 33, and disengaging pawl 46 is forced separating slices and adsorption band 33 by cam claw.Disengaging pawl 46 is provided with rotationally around rotating center 46a, and contacts with adsorption band 33 by unshowned torque spring.

Therefore, this have electric charge and eliminate pin 45 and disengaging pawl 46 or the separation method by flex apart and make the thin slice upset, and do not cause the change of the transporting velocity of adsorption band 33 and thin slice.

Fig. 7 illustrates and is used in combination the situation that electric charge is eliminated pin 45 and disengaging pawl 46, but they needn't be used in combination, but can use any one individually.In addition, electric charge elimination pin 45 and disengaging pawl 46 may be used as aforementioned servicing unit by flex apart.

Fig. 8 is the skeleton view that is in by under the actual thin slice state of carrying to roll-over unit 30 illustrated in fig. 7 at Fig. 2.As shown in Figure 8, thin slice S carries to roll-over unit 30 from inlet conveying 42a under positive (surface that the first time, image formed of thin slice) state up.

The thin slice S that is transferred is carried by adsorption band 33, and the rotation on direction B shown in Figure 3 drives adsorption band 33 in rotation on the direction A shown in Figure 2 and band driven roller 36 by band driven roller 35.In this state, support roller 37 is driven along direction C shown in Figure 2, and pressure roll 39 rotates along direction D shown in Figure 2.Thin slice is adsorbed to adsorption band 33 in its front, and is directed to the conveying end position along the distorted-structure of adsorption band 33 in this state.

Then, thin slice S separates by the separation method of aforesaid adsorption band 33 and thin slice, and transfers to next transport path from outlet conveying 43a, 43b.Carrying the starting position and carrying between the end position and twist 180 ° owing to constitute the surface of the adsorption band 33 of roll-over unit 30, thin slice is by being carried by such adsorption band 33, and its front and back is reversed.The direction of twist of adsorption band 33 and throughput direction preferably are chosen as the front portion that makes thin slice S be brought to device.

Below, will another example of the turning device of present embodiment be described.Fig. 9 is the skeleton view of another example that the turning device of present embodiment is shown, wherein, with composition identical among Fig. 1 use with Fig. 1 in identical symbolic representation, and the explanation among Fig. 1 is suitable for.

Fig. 1 has illustrated method by single adsorption band 33 upset thin slices to Fig. 8.Yet, be not to pass through single adsorption band 33 upset thin slices, but can obtain similar effect by the upset that is divided into two parts as shown in Figure 9.

In turning device shown in Figure 9 47, thin slice S carries from direction E, and stands 90 ° of upsets by the adsorption band 49 of the first turning device 47a.After through the first turning device 47a, thin slice S carries through intermediate path 52 under the support of conveying roller 51.Then, in case arrive the second turning device 47b, it further stands 90 ° switching process by adsorption band 50.Then, overturning altogether after 180 °, thin slice is discharged along direction F, and is transported to thin slice location division 9 once more.

This switching process is divided into two parts, to reduce the required distance of overturning, and thus can be so that device is compacter.Aforesaid turning device 47 illustrates adsorption band structure divided into two parts, still, and this two parts that separately are not limited to, but may be three or more parts.Therefore, this separate construction of turning device makes and does not adopt large-sized band just can enjoy effect of the present invention.

In the roll-over unit 30 of present embodiment, as previously mentioned, be used to carry the adsorption band 33 of thin slice supported between band driven

roller

35 and 36 with 180 ° of distorted shape, and thin slice is carried by being attracted on such adsorption band 33, can reduce the required time of thin slice upset thus, to improve throughput rate in the duplex printing process.

In addition, by chip sorption is arrived adsorption band 33, and carrying the starting position and carrying between the end position and carrying thin slice under the state of distortion at a predetermined angle by adsorption band 33, the roll-over unit 30 of present embodiment can reduce the upset required time of thin slice, needn't carry thin slice with the speed that increases thus, therefore, reduce the pollution on thin slice of roller or analog, and avoided degenerating of thin slice quality.

In addition, in the roll-over unit 30 of present embodiment, the thin slice that under the state that is adsorbed on the adsorption band 33, is transferred, not supported partly, therefore prevented as the thin slice damage of clamping vestige and the variation of print quality, and further prevented the thin slice vibration during conveying operations, improved the stability of carrying thus.

In addition, by under the state that is adsorbed on the adsorption band 33, carrying thin slice, the roll-over unit 30 of present embodiment can reduce the upset required time of thin slice, and need in two-sided 7, not increase transporting velocity, can use the motor of less driving power thus, thereby the temperature in the restraining device rises or noise level.

And, according to the type of thin slice, by by charging control section 40 control with chip sorption used electrostatic force to the adsorption band 33, the roll-over unit 30 of present embodiment can reduce power consumption.

And, compare with the sheet turn-over device of for example zigzag, the roll-over unit 30 of present embodiment can be saved the required space of upset thin slice, thereby make sheet turn-over device and the image processing system compactness of utilizing this sheet turn-over device, wherein, in the roll-over unit 30 of present embodiment, thin slice is carried by being adsorbed on the adsorption band 33, and the surface of adsorption band 33 is twisted predetermined angular between conveying starting position and conveying end position.

In previous example with single adsorption band 33 and upset thin slice with two adsorption bands 49 and 50, flip angle is assumed to be 180 °, but this angle is not limited to 180 °, but can according to after upset to the shape of the processing of thin slice or transport path and selection arbitrarily.This equally also can be applicable to use the situation of three or more adsorption bands.

And in previous example, the image processing system 1 with roll-over unit 30 (sheet turn-over device) is interpreted as coloured image and forms device, and still, as long as can carry out duplex printing on thin slice, it also can be that special-purpose monochrome image forms device.

And, in previous example, image processing system 1 with roll-over unit 30 is assumed that carrying out image according to the view data that is read by manuscript reading section 2 forms, but also can be used as the image processing system that can network connects, for example, the view data that is transmitted by for example network of internet, Local Area Network or WLAN (wireless local area network) (LAN) based on the information terminal from for example another image processing system or PC is carried out the image processing system that image forms.

In this external aforesaid example, be used to avoid the support roller 37 of adsorption band 33 mutual frictions only to be used by a unit, still, it can use in a plurality of unit, further to stablize the shape of adsorption band 33 when thin slice is carried with its conveying operations.

As mentioned above, in the duplex printing that carries out thin slice, especially need in the dual-side image forming process under the high-speed situation, sheet turn-over device of the present invention and image processing system are effective.

The application requires the right of priority at the Japanese patent application No.2004-291404 of submission on October 4th, 2004, and its content is contained in this by reference.

Claims

1. a sheet turn-over device is used for overturning at a predetermined angle thin slice, and it comprises:

Conveying belt, it is used to carry thin slice;

Drive unit, it drives conveying belt; And

Adsorbent equipment, it makes conveying belt adsorb thin slice;

It is characterized in that the chip sorption surface of conveying belt has distortion between conveying starting position and conveying end position.

2. sheet turn-over device according to claim 1 is characterized in that, conveying belt is being carried the starting position and carried the front and back upset that makes thin slice between the end position.

3. sheet turn-over device according to claim 1 is characterized in that, conveying belt comprises at least two conveying belt that are used for carrying along the thin slice throughput direction thin slice; And

The distortion angle sum of a plurality of conveying belt equals in the required angle of front and back of carrying starting position upset thin slice.

4. sheet turn-over device according to claim 1 is characterized in that adsorbent equipment makes conveying belt adsorb thin slice by electrostatic adsorption.

5. sheet turn-over device according to claim 4 is characterized in that, adsorbent equipment comprises the control device according to the type control absorption affinity of thin slice.

6. sheet turn-over device according to claim 1 further comprises auxiliary tripping device, and it is carrying end position to separate the thin slice that is adsorbed on the conveying belt from conveying belt.

7. a sheet turn-over device is used for overturning at a predetermined angle thin slice, and it comprises:

Be arranged on the band driven roller of the conveying starting position of thin slice;

Be arranged on the band driven roller of the conveying end position of thin slice;

Adsorption band, it is supported under the state of distortion at a predetermined angle between each band driven roller; And

Charging control section, it is used to control AC power supplies or DC power supply, with to band driven roller supplying electric current, thereby provides electrostatic force to adsorption band.

8. sheet turn-over device according to claim 7 further comprises being in respectively with the substantial middle place of driven roller and in the support roller of the inboard of supported adsorption band, to prevent the mutual friction of adsorption band.

9. sheet turn-over device according to claim 7 is characterized in that, charging control section is according to the absorption affinity of the type control adsorption band of thin slice.

10. sheet turn-over device according to claim 7 further comprises electric charge elimination pin, is used to reduce near the absorption affinity of the adsorption band thin slice is carried end position, and the thin slice that is adsorbed to thus on the adsorption band is separated by electric charge elimination pin.

11. sheet turn-over device according to claim 7 further comprises disengaging pawl, it is arranged on rotationally near the conveying end position of thin slice and by spring and contacts with adsorption band, and being adsorbed to thin slice on the adsorption band thus, to pass through disengaging pawl separated.

12. an image processing system, it comprises:

Image forming part; And

Two-sided transport path is used for thin slice is transported to image forming part once more, and this thin slice carries the image that is formed by image forming part at its first face;

It is characterized in that two-sided transport path comprises according to any described sheet turn-over device in the claim 1 to 11.