JPH08190317A - Device for eliminating image forming material from sheet material using solution supply member and sheet material processor - Google Patents

Abstract

PURPOSE: To prevent a trailing edge part of a sheet from being bent caused by fast-forwarding by providing a device with two solution application rollers, applying solution by rotating the rollers at a higher speed than the carrying speed of a sheet material and reversely rotating the rollers while the free trailing edge part of the sheet material is faced to the respective application rollers. CONSTITUTION: Two solution applicators 201 and 202 are provided between a resist roller pair 106 and the offset belt 301 and the upper heating roller 305 of a toner peeling unit. Generally, the application rollers 201b and 202b of the respective applicators are normally rotated at a high speed in the carrying direction of the sheet material 1. Then, the first roller 201b is reversely rotated at least while the trailing edge of the sheet material is separated from the roller pair 106 and faced to the roller pair 201b. The second roller 202b is reversely rotated at least while the trailing edge of the sheet material is separated from the first roller 201b and faced to the second roller 202b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes an image forming substance from a sheet material on which the image forming substance is stably attached by an image forming apparatus such as a copying machine, a facsimile machine, a printer, a printing machine, etc. The present invention relates to an apparatus and a sheet material processing apparatus, and more specifically, a liquid supply member having a liquid carried on its surface is moved in a direction that follows the sheet material conveyance direction at a speed higher than the sheet material moving speed for a short time. A sheet that is driven to supply a desired amount of liquid to the sheet material and to prevent the sheet material from being bent or the liquid supply amount being insufficient due to the rapid forward movement of the sheet material at the trailing edge of the sheet material. The present invention relates to an apparatus for removing an image forming substance from a sheet and a sheet material processing apparatus.

[0002]

2. Description of the Related Art First, the applicant of the present invention applied to a recorded sheet material,
Holds at least one water or aqueous solution selected from the group consisting of water as a destabilizing agent, an aqueous solution containing a surfactant, an aqueous solution containing a water-soluble polymer, and an aqueous solution containing a surfactant and a water-soluble polymer. In addition, a method for removing an image-forming substance is proposed, in which an image-forming substance is heat-bonded or pressure-bonded to the peeling member by interposing a peeling member and peeled from the sheet material (for example, see Japanese Patent Application No. 4-255916). . According to this, only the image forming substance can be removed without relatively damaging the paper quality of the sheet material.

[0003]

In order to carry out the method proposed above, a liquid supply member having a liquid carried on the surface thereof is moved at a speed higher than the moving speed of the sheet material in the direction following the sheet material conveying direction. It is conceivable that a desired amount of liquid is supplied to the sheet material by driving the sheet material so that the sheet material moves for a short time. However, when such a liquid supply member is used, the sheet rear end is arranged upstream of the liquid supply member in the sheet material conveyance direction,
After removing the holding and conveying device that conveys the sheet material while sandwiching it in the thickness direction, the rear end portion of the sheet material is fast-forwarded by the liquid supply member, and the sheet material may be folded,
There is a risk of insufficient liquid supply.

Therefore, the present applicant has previously proposed that the sheet material is opposed to the liquid supply member and the rear end portion of the sheet material is out of the state of being held by the upstream holding and conveying means. An apparatus for removing an image forming substance from a sheet material and a sheet material processing apparatus which drive-control the liquid supply member so that the surface of the supply member moves in the direction opposite to the sheet material have been proposed (Japanese Patent Application No. 5-201174). issue).

The present invention relates to an improvement of the invention of this prior application, and is an apparatus for removing an image-forming substance from a sheet material and a sheet material treatment in which a plurality of the liquid supply members are arranged along a sheet material conveying path. It is an object of the present invention to provide an apparatus for removing an image-forming substance from a sheet material and a sheet material processing apparatus, which are capable of preventing problems caused by fast-forwarding of the trailing edge of the sheet material by each liquid supply member.

[0006]

In order to achieve the above object, the invention of claim 1 is a sheet material for removing an image forming substance from a sheet material having an image forming substance adhered on the surface thereof. In the image forming substance removing apparatus, first and second sheets are arranged at a predetermined interval along a sheet material conveying path, and sandwich the sheet material in a thickness direction and convey the sheet material in a predetermined direction.
Of the holding and conveying device and the first and second holding and conveying devices in the conveying path, the liquid is carried on the surface, and the sheet material is conveyed in the conveying direction by the first and second holding and conveying devices. A liquid supply device provided with a plurality of liquid supply members that are driven so as to selectively move endlessly in a direction in which the liquid is fed and a direction opposite to the transport direction, and a predetermined number for each of the plurality of liquid supply members. During the period, the sheet is moved in a direction that follows the above-described conveying direction at a speed faster than the moving speed of the sheet material, and at least each of the members that gives the conveying force to the sheet material conveyed in the predetermined direction is a sheet. During the period corresponding to the member facing the rearmost end of the material, the liquid supply member drive control means for causing a short movement in the direction opposite to the transport direction, and the sheet material supplied with the liquid by the liquid supply means. Imaging to remove imaging substances In which characterized in that a and quality removing means.

According to a second aspect of the invention, in the apparatus for removing an image forming substance from a sheet material according to the first aspect, the liquid supply member drive control means is provided for the plurality of liquid supply members.
At least during the period corresponding to the member facing the most front end of the sheet material among the members that give the conveying force to the sheet material being conveyed in the predetermined direction, the movement of the sheet material in the direction following the above-mentioned conveying direction. It is characterized in that it is configured to move at a speed higher than the speed and without a short distance.

According to a third aspect of the present invention, in the apparatus for removing an image-forming substance from a sheet material according to the first or second aspect, the liquid supply member drive control means controls the sheet material for each of the plurality of liquid supply members. It is characterized in that it is configured such that the short movement of the surface is started before the tips are opposed to each other.

According to a fourth aspect of the present invention, in a sheet material processing apparatus for supplying a liquid to a sheet material and performing a predetermined process, the sheet material is disposed at predetermined intervals along a sheet material conveying path, and the sheet materials are respectively disposed. First and second sandwiching and conveying devices that sandwich and convey in the thickness direction, and first and second in the conveying path
It is placed between the holding and transporting devices, carrying the liquid on the surface,
A plurality of liquid supply members that are driven to selectively move endlessly in a direction following the sheet material conveyance direction by the first and second holding and conveying devices and a direction opposite to the conveyance direction are provided. The liquid supply device and the plurality of liquid supply members are each moved for a predetermined period at a speed higher than the moving speed of the sheet material in a direction following the transfer direction, and each of them is conveyed in at least a predetermined direction. Liquid supply member drive control in which the member corresponding to the rearmost end of the sheet material among the members for imparting the conveying force to the sheet material is moved in the direction opposite to the conveying direction for a short time. Means and means are provided.

According to a fifth aspect of the invention, in the sheet material processing apparatus according to the fourth aspect, the liquid supply member drive control means is conveyed at least in a predetermined direction for each of the plurality of liquid supply members. Among the members that give the conveying force to the sheet material, during the period corresponding to the member facing the most distal end of the sheet material, the sheet material should be moved in the direction following the above-mentioned conveying direction at a speed higher than the moving speed of the sheet material. It is characterized by being configured in.

[0011]

According to the present invention, each of the plurality of liquid supply members, which are arranged along the sheet material conveying path and carry the liquid on the surface thereof and move shortly, is provided with the sheet material conveying direction for at least a predetermined period. The sheet material is moved at a speed higher than the moving speed of the sheet material in the direction in which the sheet moves. Thus, the liquid can be satisfactorily supplied to the sheet material by the plurality of liquid supply members without causing liquid shortage between the liquid supply members and the sheet material. Then, each of the plurality of liquid supply members corresponds to at least a member facing the rearmost end portion of the sheet material among the members that give a conveying force to the sheet material being conveyed in the predetermined direction. During the period in which the end portion may be fast-forwarded, the end portion is moved in the direction opposite to the above-described conveyance direction for a short time. This prevents the sheet material from being broken and the liquid supply amount from being insufficient due to the fast-forwarding.

Further, in the present invention, each of the plurality of liquid supply members is opposed to at least the most distal end of the sheet member among the members that apply a conveying force to the sheet member being conveyed in the predetermined direction. It corresponds to a member, and in a period in which there is a possibility that the front end of the sheet material may be sent to the upstream side in the conveying direction by the short-length movement in the opposite direction, it is faster than the moving speed of the sheet material in the direction following the conveying direction. It is desirable to move it for a short time. According to this, in the short movement in the opposite direction,
It is possible to prevent the sheet material from being broken or jammed by feeding the front end portion of the sheet material to the upstream side in the transport direction.

Furthermore, in the present invention, it is desirable that the surface of each of the plurality of liquid supply members starts to move in a short period before the front ends of the sheet members face each other. According to this, it is possible to prevent the sheets from facing each other at the time when the liquid film on the surface is not stable immediately after the start of the short movement of the surface and uneven liquid supply occurs.

[0014]

EXAMPLES Hereinafter, the present invention is a toner for removing a heat-melting toner (hereinafter referred to as a toner) as an image forming substance from a transfer paper as an image carrier on which an image is formed by a transfer type electrophotographic copying machine. An example applied to the removing device will be described. FIG. 1 is a schematic configuration diagram showing a configuration example of a toner removing device to which the present invention is applicable. First, the overall outline will be described. In this toner removing device, a sheet feeding unit 100 that separates and feeds, one by one, the transfer sheets 1 on which the toner images stored in the stacked state are formed, and a sheet feeding unit 100.
A liquid supplying unit 200 as a destabilizing liquid applying unit that applies the destabilizing liquid to the transfer paper 1 sent from the liquid transfer device 1, and a liquid supply device 220 that supplies the processing liquid 2 described later to the liquid applying unit 200. A toner peeling unit 300 as a peeling unit that peels and removes the toner from the transfer paper 1 supplied with the destabilizing liquid, a drying unit 400 for drying the transfer paper 1 from which the toner has been removed, and a discharge from the drying unit 400. And a paper receiving unit 500 that receives the transfer paper 1.

In the paper feeding unit 100, the transfer papers 1 stacked on the bottom plate 101 are fed from the top to the paper feeding roller 1.
No. 02 is fed, and a double feed sheet is separated by a separating mechanism including a feed roller 103 and a separate roller 104, and only one transfer sheet 1 is sent out. The transfer sheet 1 sent out by the sheet feeding unit 100 is conveyed by the conveying roller pair 105, timing adjustment and skew correction are performed by the registration roller pair 106, and the next liquid applying unit 200 is provided.
Sent to The specific configuration and operation of the paper feeding unit 100 and the like are the same as those of the paper feeding mechanism in the electrophotographic copying machine, and therefore detailed description will be omitted.

The liquid applying unit 200 has a liquid container filled with a predetermined amount of a treatment liquid 2 as a destabilizing liquid that makes the adhesion state of the transfer paper 1 and the toner unstable, and the liquid in the liquid container. Two liquid applicators 201 and 202 are provided in the conveying direction from a liquid application roller provided so as to be partially submerged therein. Above the liquid application roller of each applicator, the paper regulating roller 2 is provided so that the surfaces thereof face each other at a predetermined interval.
03, 204 are provided. Then, in the transport direction of the transfer paper 1, the transfer paper is transported between the first-stage liquid applicator 201 and the second-stage applicator 202 and to the downstream side of the second-stage applicator 201. Relay roller pair 205, 206
Is provided. Then, each liquid applicator 201, 202
A liquid receiving tank 215 is provided below the relay roller pair 205, 206 and the like. The liquid applying unit 200 will be described in detail later.

The treatment liquid 2 is at least one kind of water selected from the group consisting of water, an aqueous solution containing a water-soluble polymer, an aqueous solution containing a surfactant, and an aqueous solution containing a water-soluble polymer and a surfactant. Alternatively, an aqueous solution can be used.

The liquid supply device 220 is provided in the lower part of the device, and is a replaceable replenisher bottle 208 and replenisher bottle 2.
08 to the electromagnetic pump 209 to appropriately replenish the processing liquid 2, a processing liquid tank 210, a liquid supply pump 211 such as a blade pump built in the processing liquid tank 210, a pump motor 212 for rotationally driving the liquid supply pump 211, a liquid supply The processing liquid 2 discharged from the pump 211 to the liquid containers 201 and 202 and the processing liquid 2 discharged to the liquid receiving tank 215 from the liquid discharge port provided at the bottom of the liquid containers 201a and 202a are processed. It is composed of a recovery pipe 214 and the like for returning it into the liquid tank 210. Here, the liquid supply pump 211
The processing liquid 2 sent by is passed through the liquid supply pipe 213 and supplied to the liquid containers of the liquid applicators 201 and 202. And
The processing liquid 2 flowing out of the liquid container and received by the liquid receiving tank 215 is returned to the processing liquid tank 210 through the recovery pipe 214 and circulated. During such a steady circulation operation of the treatment liquid 2, in each of the liquid applicators 201 and 202, the liquid supply roller 211 supplies the liquid so that the liquid application roller is immersed in the treatment liquid 2 in the liquid container by a predetermined amount. Liquid volume etc. are set.

The toner peeling unit 300 includes a toner offset belt (hereinafter referred to as an offset belt) 301 as a belt-shaped peeling member wound around a plurality of support rollers 302 and 303, and an offset belt 3.
Heating block 304 and upper heating roller 305 with a built-in heating lamp provided so as to be pressed against each other with 01 interposed therebetween.
A tension roller 306 that applies a predetermined tension to the offset belt 301, a cleaning brush 307 that rotates while contacting the surface of the offset belt 301 to remove toner, and a toner receiver that receives the toner removed by the cleaning brush 307. And 308.

Here, the heating block 304 and the upper heating roller 305 bring the toner image surface of the transfer paper 1 into close contact with the offset belt 301 and heat the toner adhered to the transfer paper 1 to soften it. .

Further, at least the surface of the offset belt 301 that is in contact with the toner is formed of a material capable of exerting an adhesive force to the softened toner that is greater than the adhesive force between the surface of the transfer paper 1 and the toner. Has been done. For example,
The belt itself is formed of a metal material such as an aluminum-based material, a copper-based material, a nickel-based material, or a polymer-based material such as polyethylene terephthalate (PET) in which titanium oxide is dispersed. Further, the offset belt 16 may be composed of a plurality of layers, at least one of which may be a heat-resistant layer having excellent strength and heat resistance, and the layer in contact with the toner may be an adhesive layer having excellent adhesion to the toner.

Further, a bent portion for changing the moving direction of the offset belt 301 by about 90 degrees with a predetermined radius of curvature is located on the downstream side in the moving direction of the offset belt 301 from the pressure contact portion with the upper heating roller 305 of the heating block 304. Around the bent portion, the moving direction of the belt is rapidly changed to separate the curvature of the transfer paper 1 from the offset belt 301.

The drying unit 400 is for drying the transfer paper 1 so that the liquid holding amount of the transfer paper 1 is 10% or less of the paper weight, and includes a heating drum 401 having a built-in heating lamp and made of, for example, aluminum. , A paper pressing belt 402 which is stretched around a plurality of supporting rollers and is endlessly moved while being wound around the peripheral surface of the heating drum 401 at a constant angle. As the material of the paper pressing belt 402, a material having heat resistance and air permeability, for example, cloth such as canvas cloth, cotton cloth, and Tetron cloth can be used.

The paper receiving unit 500 includes a pair of conveying rollers 501 for conveying the transfer sheet 1 from the drying unit 400, a branch claw 502, and pairs of discharging rollers 503, 50.
4, built-in paper ejection tray 505, external paper ejection tray (not shown)
If necessary, the built-in paper discharge tray 50
5 or the discharge to the external discharge tray can be selected. Here, the built-in discharge tray 505 is slidable so that it can be pulled out to the front side of the apparatus.

In the toner removing device having the above-mentioned structure, the transfer paper 1 sent from the paper feeding unit 100 is treated by the liquid applying unit 200 on the toner image surface (the lower surface in the figure) of the processing liquid 2.
Is sent to the toner peeling unit 300. For example, the transfer liquid 1 of A4 size is applied with 2 g or more of the treatment liquid 2. With this toner peeling unit 300, the transfer paper 1
The toner stuck to the toner is softened by heating from the heating block 304 and the upper heating roller 305, and the offset belt 3
01 It adheres to the surface. Then, when the transfer paper 1 and the offset belt 301 are separated from each other around the bent portion of the heating block 304, the toner attached to the surface of the offset belt 301 is separated from the transfer paper 1, thereby removing the toner from the transfer paper 1. To be done. The transfer paper 1 from which the toner has been removed is dried by the drying unit 400, and is discharged onto the built-in discharge tray 505 of the paper receiving unit 500 by the discharge roller pair 503. By the above toner removal processing, since the liquid is supplied to the transfer paper 1 to which the toner is attached and the liquid is permeated into the interface of the transfer paper 1 with the toner, the toner is peeled off, so that the paper fiber is not damaged. Toner can be removed. (Hereinafter, margin)

Next, the structure of the liquid applying unit 200 used in the toner removing device will be described in more detail with reference to FIG. In each of the liquid applicators 201 and 202, the liquid application rollers 201a and 202a and the paper regulating roller 201b,
The surface distance from the transfer paper 202b is slightly larger than the thickness of the transfer paper so that a predetermined amount of the processing liquid can be contained by allowing expansion of the transfer paper in the thickness direction due to the permeation of the processing liquid 2. It is set to be slightly larger than the thickness of the transfer paper expanded by the liquid. In addition, each relay roller pair 205,
The lower side of the 206 is rubber rollers 205a and 206a, and the upper side thereof is brush rollers 205b and 206b. The rubber rollers 205a and 206a and the brush roller 205
b and 206b are provided at intervals such that the brushes of the brush rollers 205b and 206b come into direct contact with the surfaces of the rubber rollers 205a and 206a and bend a little, assuming that the transfer paper does not exist between them, and they are driven and rotated. It is like this. As a result, these relay roller pairs 20
Reference numerals 5 and 206 can apply a conveying force by sandwiching the transfer paper with upper and lower rollers. However, this holding and conveying force is due to the registration roller pair 106 as the holding and conveying device, the heating block 304 of the toner peeling unit 300, and the upper heating roller 305.
It is much smaller than the pair with and, in particular, both liquid applicators 201,
The first-stage relay roller pair 205 arranged between 202
Is 2 because the distance between both rollers is slightly wider.
Even when compared with the relay roller pair 206 at the stage, the gripping and conveying force is small. The brush roller 205b of the relay roller pair 205 of the first stage is a pair of brush rollers that are in charge of the transfer paper width direction center and the front side of the apparatus, and are responsible for each half of the transfer paper in the transfer paper width direction. It is composed of. The pair of brush rollers are arranged such that the end on the center side is inclined more downstream than the end on the outer side in the transport direction, and have a V shape when viewed from the registration roller pair 106 side. As a result, the transfer paper to which the treatment liquid is supplied by the first-stage liquid applicator 201 is conveyed while being applied with a force to spread it outward in the width direction.

The transfer paper from the registration roller pair 106 is transferred to the registration roller pair 106 and the first-stage liquid applicator 20.
1, 1st stage relay roller pair 205, 2nd stage liquid applicator 2
02, the second stage relay roller pair 206, and the upper heating roller 305 and the peeling belt 30 in the toner peeling unit.
A plurality of guide members 207 are provided so as to be able to guide from above and below along the conveyance path between adjacent ones of the contact portions with 1. As each guide member, a thin plate arranged so that its end surface faces the transfer paper, a flat plate subjected to stringing, or a wire is used so that the contact area with the transfer paper is as small as possible. With respect to a portion that may be wrapped around, a slit portion is appropriately formed on the roller surface portion, and a guide member made of a thin plate or the like is arranged so as to partially enter the slit portion. A plurality of guide members made of the above-mentioned thin plates and wires are arranged side by side in the width direction of the transfer paper.

The registration roller pair 106 is
After the transfer paper 1 sent from the paper supply unit 100 is received in a stopped state to correct the squaw, the transfer paper 1 is rotated clockwise at a predetermined timing to rotate the liquid application device 2 of the first stage.
Send it to the 01 side. This rotation operation is continued until just before the next transfer sheet 1 is fed from the paper feeding unit 100, and the skew of the next transfer sheet 1 is similarly corrected, and then the transfer sheet 1 is conveyed to the first-stage liquid applicator 201 side. To do. The registration roller pair 106 is drive-controlled so that the interval between the transfer sheets continuously fed to the first-stage liquid applicator 201 side becomes constant regardless of the size of the transfer sheet 1.

Further, the above-mentioned two-stage liquid applicators 201, 202
Rollers 201b, 203, 202b, 204, and rollers 205a, 205b, 206a, 206b of the two-stage relay roller pair 205, 206, respectively, are designed to convey the transfer paper 1 to the toner peeling unit 300 side. The two liquid application rollers 201b and 202b can be rotated in the forward and reverse directions. These two liquid application rollers 201
By switching the rotation directions of b and 202b, it is possible to prevent the transfer sheet from being folded due to the fast-forwarding of the rear end of the transfer sheet 1. Hereinafter, this point will be described in detail.

FIG. 2B shows the first stage liquid applying roller 20.
Timing charts for switching the forward and reverse rotations of the liquid application roller 202b of the first stage and the second stage, FIGS. 3A to 3E show the transfer at each timing (a) to (e) shown in FIG. 2B. FIG. 6 is an explanatory diagram of a transport position of the paper 1 and a rotation state of each roller. Here, the example shown in FIGS.
4 shows an example in which the 4-size transfer paper 1 is conveyed in the lateral direction, and the point A is the position and point of the paper sensor for detecting the trailing edge of the transfer paper, which is arranged upstream of the registration roller pair 206 in the conveying direction. B is the nip position of the registration roller pair 206, and point C is the first-stage liquid applying roller 201b and the paper regulating roller 2.
03, the position of the gap (hereinafter referred to as the first stage coating roller gap position), point D is the second stage liquid coating roller 202.
b, a gap position between the paper regulating roller 204 (hereinafter, referred to as a second-stage coating roller gap position), a point E is a nip position between the offset belt 301 and the upper heating roller 305 on the heating block in the toner peeling unit 300 (hereinafter, referred to as a nip position). The nip position of the toner peeling unit) is shown respectively. The specific distance between these points in this example is 45 mm between AB, 50 mm between BC and 85 m between CD.
The distance between m and DE is 108 mm.

First, as shown in FIG. 3A, with respect to the first transfer sheet 1, the leading end of the transfer sheet conveyed by the registration roller pair 106 has the application rollers 201b and 202b.
Both rollers start to rotate sufficiently before reaching the gap between the sheet regulating rollers 203 and 204, and a liquid film of the treatment liquid is stably formed on the surfaces of the coating rollers 201b and 202b. ing. At this time, all the rollers are rotationally driven so as to convey the transfer paper 1 to the toner peeling unit 300 side. And the peripheral speed of each roller is
It is set as follows. Register roller pair: 20 mm / sec First stage coating roller: 70 to 130 mm / se
Setting speed in the range of c 1st step paper regulation roller: Same speed as registration roller pair 1st step relay rubber roller: 1.025 times peripheral speed of registration roller pair 1st step relay brush roller: Registration roller pair 1.05 times peripheral speed Second stage coating roller: Set speed in the range of 45 mm / sec Second stage paper regulating roller: Same speed as registration roller pair Second stage relay rubber roller: 1.025 of registration roller pair Double peripheral speed Second stage relay brush roller: 1.05 times peripheral speed of registration roller pair Upper peripheral speed of heating roller 305 and offset belt 301: Same speed as registration roller pair Rear end of this first sheet The timer starts from the time when is detected by the paper sensor.

After that, as shown in FIG. 3B, the count of the above-mentioned timer is such that the trailing edge of the first transfer sheet 1 reaches a point R ₁₁ which is, for example, 10 mm before the nip position B of the registration roller pair 106. When the count reaches the arrival time, the reverse rotation of the first-stage coating roller 201b is started. The reverse rotation peripheral speed is the same as the normal rotation peripheral speed. At this point, the front end of the transfer paper 1 has reached a position T ₁₁ which is 7 mm before the nip position E of the toner peeling unit.

After that, as shown in FIG. 3 (c), the count of the above-mentioned timer is such that the trailing edge of the first transfer paper 1 is at a point R ₂₁ which is, for example, 10 mm before the first-stage coating roller gap position C. At the time of reaching the count of reaching, the reverse rotation of the second-stage coating roller 202b is started. The reverse rotation peripheral speed is also the same as the normal rotation peripheral speed. At this point, the front end of the transfer paper 1 has passed the nip position E of the toner peeling unit.

After that, as shown in FIG. 3D, the count of the timer is a point R at which the trailing edge of the first transfer paper 1 passes the first-stage coating roller gap position C by, for example, 5 mm.
_When the count reaches the point of reaching ₁₀ , the rotation of the first-stage coating roller 201b is reversed and normal rotation is resumed. At this point, the front end of the second transfer paper 1 has reached a point T ₁₀ that is 25 mm before the first-stage coating roller gap position C.

Thereafter, as shown in FIG. 3 (e), the count of the timer is a point R at which the trailing edge of the first transfer sheet 1 passes the second-stage coating roller gap position D by, for example, 5 mm.
_When the count reaches ₂₀ , the rotation of the second-stage coating roller 201b is reversed and normal rotation is resumed. At this point, the leading edge of the second transfer paper 1 has reached a point T ₂₀ 25 mm before the second-stage coating roller gap position C.

Then, when the trailing edge of the second transfer sheet 1 is detected by the paper sensor, the timer is restarted and the rotation direction of each coating roller is switched in the same manner as the first sheet.

As described above, in this embodiment, as shown in FIG. 3B, the first-stage coating roller 201b is reversed immediately before the trailing edge of the transfer paper 1 leaves the nip of the registration roller pair 106. 3D, and as shown in FIG. 3D, until the rear end leaves the first-stage coating roller gap position C,
By continuing this reverse rotation, after the switching to this reverse rotation, the rear end of the transfer paper leaves the nip, and the first-stage coating roller 201b serves as a conveying member facing the transfer paper 1.
Of the first-stage coating roller and paper regulating roller 203, the first-stage relay roller pair 205, the second-stage coating roller 202b and paper regulating roller 204, the upper heating roller 305 of the toner peeling unit, and the like, the rearmost end of the transfer paper. Since the first-stage coating roller 201b continues to be rotated in the reverse direction during the period in which the first-stage coating roller 201b is opposed to the sheet, it is possible to prevent fast-forwarding of the rear end of the transfer sheet due to high-speed forward rotation of the first-stage coating roller 201b.

As shown in FIG. 3D, the forward end of the succeeding transfer paper 1 resumes normal rotation before reaching the first-stage coating roller gap position C, and then the transfer paper 1 This normal rotation is continued until the trailing edge is detected by the paper sensor and reaches the position R ₁₁ immediately before the nip position B of the registration roller pair shown in FIG. After switching to, the front end of the transfer paper passes through the first-stage coating roller gap position C, and the first-stage coating roller 201b
The first-stage coating roller and paper-regulating roller 203 serving as a conveying member facing the transfer paper 1 and the first-stage relay roller pair 2
05, second stage coating roller 202b and paper regulating roller 2
04, the second-stage relay roller pair 205, the upper heating roller 305 of the toner peeling unit, and the like, the first-stage coating roller 201b is continuously rotated in the normal direction during a period in which it faces the leading edge of the transfer paper. It is possible to prevent the transfer from being folded or jammed due to the return conveyance of the front end of the transfer paper due to the reverse rotation of the first-step application roller 201b.

Further, as shown in FIG. 3D, the forward rotation is restarted with a sufficient margin before the leading end of the succeeding transfer paper 1 reaches the first-stage coating roller gap position C. ,
Immediately after switching from reverse rotation to forward rotation, the first-stage coating roller 20
After the liquid film on 1b has changed from an unstable state to a stable state, the front end of the transfer paper can be brought in, and stable application of the treatment liquid can be performed from the front end.

On the other hand, as for the second-stage coating roller 202b, as shown in FIG. 3 (c), it is switched to the reverse direction immediately before the rear end of the transfer paper 1 leaves the first-stage coating roller gap position C, and the second stage coating roller 202b is switched to the reverse direction. As shown in (e), by continuing this reverse rotation until the rear end leaves the second-stage coating roller gap position D, the rear end of the transfer paper is coated with the first-stage coating after switching to this reverse rotation. After removing the roller gap position C, the second-stage coating roller 201b serves as a conveying member facing the transfer sheet 1, and the second-stage coating roller and the paper regulating rollers 204, 2 are provided.
Among the second relay roller pair 205, the upper heating roller 305 of the toner peeling unit, etc., the second coating roller 201b continues to be reversed during the period of facing the rear end of the transfer paper, so that the second coating is performed. It is possible to prevent fast-forwarding of the trailing edge of the transfer sheet due to high-speed forward rotation of the roller 201b.

Further, as shown in FIG. 3 (e), the forward end of the succeeding transfer paper 1 resumes normal rotation before reaching the second-stage coating roller gap position D, and then the transfer paper 1 This normal rotation is continued until the trailing edge is detected by the paper sensor and reaches the position R ₂₁ immediately before the first-stage coating roller gap position C shown in FIG. After switching to the transfer, the leading edge of the transfer paper passes through the second-stage coating roller gap position D, and the second-stage coating roller 201b becomes
The second stage coating roller 202b and the paper regulating roller 204, the second stage relay roller pair 205, and the upper heating roller 30 of the toner peeling unit, which serve as a conveying member facing the transfer paper 1.
Of the 5 and the like, the second-stage coating roller 201b continues to rotate in the forward direction during the period facing the leading edge of the transfer sheet. Can prevent breakage and jam.

Further, as shown in FIG. 3 (e), the forward rotation is resumed with a sufficient margin before the leading end of the succeeding transfer paper 1 reaches the second-stage coating roller gap position D. ,
Immediately after switching from reverse rotation to normal rotation, the second-stage coating roller 20
After the liquid film on 1b has changed from an unstable state to a stable state, the front end of the transfer paper can be brought in, and stable application of the treatment liquid can be performed from the front end.

Further, in this embodiment, the registration roller pair 1 is set so that the intervals of the transfer sheets that are continuously conveyed become constant.
06, and the forward / reverse switching control of each application roller is performed at the timing from the time when the trailing edge of the transfer sheet 1 is detected by the paper sensor. The same forward / reverse switching control that focuses on the trailing edge position of the succeeding transfer sheet can be applied to the transfer sheet of any size.

In the apparatus shown in FIG. 1, the replenishing solution bottle 208 and the processing solution tank 210 are provided more than the units 100, 200, 300, 400, 500 and the operating section (provided on the upper surface of the apparatus). Since it is arranged at a low position, specifically, at the bottom of the apparatus, even if the liquid leaks from the bottle 208 or the processing liquid tank 210, the leak liquid does not drip into each unit. Therefore, unlike the case where the replenishment liquid bottle 208 and the processing liquid tank 210 are arranged above the units 100, 200, 300, 400, 500, the following problems can be prevented. That is,
Jam due to leaking droplets to the transfer paper portion before entering the liquid applying unit 200, partial peeling failure due to leaking droplets to the transfer paper portion before entering the toner peeling unit 300, and cleaning of the offset belt 301 of the toner peeling unit 300. Cleaning failure due to leaked droplets to the brush 307, partial finishing failure (wrinkles, etc.) due to leaked droplets to the drying unit 400, paper receiving unit 500
It is possible to prevent problems such as stains on recycled paper due to the leakage of liquid droplets.

Further, the processing liquid tank 210 is arranged at a position lower than the liquid applying unit 200, and the supply pump 211 is provided.
Since the pump 211 is pumped up to the liquid applying unit 200, the processing liquid on the liquid applying unit 200 side can be collected in the processing liquid tank 210 by its own weight when the pump 211 is stopped such as when the apparatus is stopped. Therefore, it is possible to prevent unnecessary evaporation of the processing liquid from the processing application unit 200 and an excessive increase in the surfactant concentration of the processing liquid due to the evaporation.

In the apparatus shown in FIG. 1, the processing liquid tank 210 located in the processing liquid circulation system, specifically, the liquid suction port 231 of the liquid supply pump 211 and the recovery pipe 214 are discharged. Filters 231 and 230 for capturing foreign substances mixed in the processing liquid are provided in the section. With the filters 231 and 230, the liquid application unit 2
The liquid applying unit 200 can catch foreign matter such as paper powder mixed in the processing liquid or elution from paper through the liquid applying rollers 201a and 202a of No. 00 and remove it from the circulating processing liquid. The foreign matter is accumulated in the liquid containers 201a and 202a of the above and adheres to and adheres to the surfaces of the liquid application rollers 201a and 202a, resulting in uneven application of the processing liquid to the transfer paper 1 or clogging of the pipes 213 and 214. Such problems can be prevented. This filter 230,2
The foreign material captured by 31 can be removed from the filter during maintenance of the device. In addition, the filters 230, 23
You may exchange 1 for a new one.

Further, in the example shown in FIG. 1, the processing liquid tank 2
10, a transparent portion 240 is formed as shown by a chain line in the figure. Through this transparent portion 240, the color of the processing liquid 2 inside and the presence or absence of floating substances can be observed. Therefore, when it is determined that the treatment liquid 2 is dirty, moldy, or rotten, the treatment liquid inside can be discarded. For this disposal, the processing liquid tank may be provided with an outlet for liquid disposal in 210, or a waste liquid pipe may be connected. Further, the entire processing liquid tank 210 may be formed of a transparent member.

In the above embodiment, the case where the invention is applied to the transfer paper 1 on which an image is formed by the transfer type electrophotographic copying machine is shown, but the present invention is applied to other images such as a facsimile, a printer, a printing machine and the like. It can also be applied to an image carrier such as recording paper used in the forming apparatus. Further, the present invention is not limited to an image carrier having a fibrous structure, but can be applied to an image carrier capable of forming an image. The image carrier to which the present invention is applicable may be, for example, a laminate in which the surface layer of a base sheet such as a plastic layer is a material layer such as paper.

[0049]

According to the first or fourth aspect of the present invention, each of the plurality of liquid supply members disposed along the sheet material conveying path has a direction in which the sheet material conveying direction is aligned for at least a predetermined period. It can be moved at high speed for a short time without causing liquid shortage between each liquid supply member and the sheet material, and moreover, a sufficient amount of liquid can be supplied to the sheet material by a plurality of liquid supply members. However, each of the plurality of liquid supply members,
At least during the predetermined period when the sheet material rear end portion may be fast-forwarded, since the sheet material is moved in the direction opposite to the sheet material conveyance direction for a short period of time, while the liquid is satisfactorily supplied to the sheet material,
It is possible to prevent breakage of the sheet material and shortage of the liquid supply amount due to fast-forwarding due to high-speed short-time movement with respect to the rear end portion of the sheet material.

Further, according to the invention of claim 2 or 5, there is a risk that the front end portion of the sheet material is sent to the upstream side in the conveying direction when the plurality of liquid supplying members are moved at least in the reverse direction in a short direction. For a certain predetermined period, the sheet material is moved in the direction following the conveyance direction at a speed faster than the moving speed of the sheet material, so that the tip end portion of the sheet material is conveyed in the direction opposite to the conveyance direction. It is possible to prevent the sheet material from being broken or jammed by feeding it to the downstream side in the direction.

According to the third aspect of the present invention, the short movement of the surface of each of the plurality of liquid supply members is started before the front ends of the sheet members face each other. Therefore, the short movement of the surface is started. Immediately after that, it is possible to prevent the sheets from facing each other at a time when the liquid film on the surface is not stable and causing unevenness in liquid supply.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an entire toner removing device according to an embodiment.

FIG. 2A is an enlarged view of a liquid applying unit of the toner removing device. (B) is a timing chart of application roller control in the same liquid applying unit.

3 (a) to 3 (e) are explanatory views of the transport position of the transfer sheet 1 and the rotating state of each roller at each timing (a) to (e) shown in FIG. 2 (b).

[Explanation of symbols]

 106 registration roller pair 200 liquid application unit 201 liquid applicator 201a liquid container 201b application roller 202 liquid applicator 202a liquid container 202b application roller 203 paper regulation roller 204 paper regulation roller 205 relay roller pair 205a brush roller 205b rubber roller 206 relay roller pair 206a Brush roller 206b Rubber roller 207 Guide member 215 Liquid receiving tank 220 Liquid supply device

Claims (5)

[Claims] 1. An apparatus for removing an image-forming substance from a sheet material, which removes the image-forming substance from a sheet material having an image-forming substance adhered to the surface thereof, wherein a predetermined interval is provided along a sheet material conveying path. Disposed between the first and second sandwiching / conveying devices, each of which is arranged to sandwich the sheet material in the thickness direction and convey the sheet material in a predetermined direction, and the first and second sandwiching / conveying devices in the conveying path, The liquid is carried on the surface and driven so as to selectively move endlessly in a direction following the sheet material conveying direction by the first and second holding and conveying devices and in a direction opposite to the conveying direction. A liquid supply device including a plurality of liquid supply members, and a plurality of liquid supply members for a predetermined period,
The sheet material is moved at a speed higher than the moving speed of the sheet material in the direction following the above-mentioned conveyance direction, and at least the last of the sheet materials among the members for imparting a conveyance force to the sheet material conveyed in the predetermined direction. During the period corresponding to the member facing the end portion, a liquid supply member drive control means for causing a short movement in a direction opposite to the transport direction, and an image forming substance from a sheet material supplied with the liquid by the liquid supply means. And an image forming substance removing means for removing the image forming substance from the sheet material. 2. The image forming substance removing apparatus for removing a sheet material according to claim 1, wherein the liquid supply member drive control means comprises:
For each of the plurality of liquid supply members, at least a period corresponding to the member facing the most distal end of the sheet material among the members that imparts a conveying force to the sheet material being conveyed in the predetermined direction is in the conveyance direction. An apparatus for removing an image-forming substance from a sheet material, characterized in that the sheet material is configured to move in a short direction at a speed higher than the moving speed of the sheet material in the following direction. 3. The apparatus for removing an image-forming substance from a sheet material according to claim 1 or 2, wherein the liquid supply member drive control means is provided before the leading ends of the sheet materials face the plurality of liquid supply members, respectively. An apparatus for removing an image-forming substance from a sheet material, which is configured to start a short movement of the surface from the sheet. 4. A sheet material processing apparatus for supplying a liquid to a sheet material to perform a predetermined process, the sheet material being disposed at a predetermined interval along a sheet material conveying path, and the sheet materials are respectively sandwiched in a thickness direction. Is disposed between the first and second holding / conveying devices for conveying the liquid by the first and second holding / conveying devices in the transfer route, and carries liquid on the surface to hold the first and second holding / conveying devices. A liquid supply device including a plurality of liquid supply members that are driven so as to selectively move endlessly in a direction following the sheet material conveyance direction by the device and in a direction opposite to the conveyance direction; For the liquid supply member,
The sheet material is moved at a speed higher than the moving speed of the sheet material in the direction following the above-mentioned conveyance direction, and at least the last of the sheet materials among the members for imparting a conveyance force to the sheet material conveyed in the predetermined direction. A sheet material processing apparatus, comprising: a liquid supply member drive control means for causing a short movement in a direction opposite to the transport direction during a period corresponding to a member facing an end portion. 5. The sheet material processing apparatus according to claim 4, wherein the liquid supply member drive control means is provided for at least each of the plurality of liquid supply members with respect to the sheet material conveyed in a predetermined direction. Among the members that give the conveying force, the period corresponding to the member facing the most distal end of the sheet material is configured to move in a direction that follows the above-described conveying direction at a speed higher than the moving speed of the sheet material for a short period of time. Characteristic sheet material processing device.