JPH0792865A - Method and device for removing image forming substance from both surfaces of image holding sheet - Google Patents

Abstract

PURPOSE:To provide a device for removing toner from transfer paper capable of reutilizing the transfer paper by removing a toner image from both surfaces of the transfer paper having both surfaces on which the images have been formed and reducing the possibility that the transfer paper where the print is left as an unremoved image is abused. CONSTITUTION:The transfer paper being a processed object from a paper supply unit 1 is held by a paper holding drum 601. After supplying water solution to the transfer paper by a coating roller 207, toner is removed by a peeling belt 308. When processing for one surface is finished, the transfer paper is temporarily separated from the drum 601 and allowed to pass through a circulating path to reverse a front surface to a back surface, then it is held by the drum 601 with its other surface outside so as to remove the toner. When a CCD 603b on a carrying path detects that the unremoved print exists on the surface to which removal processing is performed precedingly, the transfer paper is stored in a 4th paper ejecting tray 501d being an exclusive one without performing the removal processing to other surface after making a hole, etc., at the print by an identification mark putting unit 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image-bearing sheet such as a transfer paper on which an image made of an image-forming substance such as surface toner is formed by an image-forming apparatus such as a copying machine, a facsimile or a printer. The present invention relates to a method and an apparatus for removing an image-forming substance from both sides of an image-holding sheet.

[0002]

2. Description of the Related Art Conventionally, various types of image forming substance removing methods and devices for removing an image forming substance such as toner from a sheet as a recorded image holding sheet have been known. For example, as one using a solvent, Japanese Patent Application Laid-Open No. 1-10
In Japanese Patent No. 1576, a sheet on which toner is attached is immersed in a soluble solvent of a toner resin and ultrasonic vibration is applied to the sheet.
A method for removing an image-forming substance is disclosed in which the toner dissolved in a solvent is released from the paper surface. In addition, JP-A-4-3003
In Japanese Patent Publication No. 95, a solvent is attached to a printed portion of waste paper by a method such as dipping, spraying or coating to dissolve the toner,
An image forming substance removing method is disclosed in which the dissolved toner is removed by a method such as washing, air suction, contact with an adsorbent, mechanical peeling or electrostatic adsorption.

On the other hand, as one not using a solvent, for example, in Japanese Patent Application Laid-Open No. 2-255195, a heat-meltable ink or a heat-meltable ink placed on a printed material coated with a release agent on a support by an electrophotographic method or a thermal transfer method is used. A method for removing an image forming substance in which toner is adhered to the ink peeling body and removed by stacking the ink peeling body on the printed body and passing the toner between the heating roller and the pressure roller and cooling the peeled ink peeling body. Is disclosed. Further, in Japanese Unexamined Patent Publication No. 4-64472, at least an endless sheet having a heat-melting resin on the surface, a heat roller and a cooling roller for supporting and rotating the endless sheet, and a paper having a release treatment on its surface (erasable paper) There is disclosed an eraser including a pressing roller that presses against a softened or melted heat-melting resin, and a drive unit that moves these in conjunction with each other. In addition, JP-A-4-829
In Japanese Patent Publication No. 83, 83, two rollers provided in parallel to rotate in pressure contact with each other to pass the paper through the pressure contact point, a heater for heating at least one of the two rollers, and a roller passing through the pressure contact point A scraper for separating the paper from the roller,
An image forming substance removing device is disclosed, which comprises a peeling device that removes the image forming substance attached to the roller from the roller.

By the way, the above solvent-free method and apparatus can be used, for example, to remove an image-forming substance from a recorded image-bearing sheet having an image recorded on ordinary paper having exposed paper fibers. Since the image forming substance mainly composed of the heat-fusible resin is fused to the image holding sheet in the fixing step of the electrophotographic system, the image forming substance is firmly fixed to the fibers on the surface of the image holding sheet. When the image-forming substance is removed, the paper fibers on the surface are peeled off together with the image-forming substance and the paper quality is damaged. Especially in order to improve the removability of the image-forming substance,
When heat or pressure is applied to the above ink peeling body, endless sheet or roller, under certain conditions, on the contrary, the fixing property between the image forming substance and the image holding sheet is increased to make removal difficult. There was also.

Therefore, the present applicant has previously proposed that the recorded image-holding sheet contains water as a destabilizing agent, an aqueous solution containing a surfactant, an aqueous solution containing a water-soluble polymer, and a surfactant and a water-soluble polymer. Containing at least one kind of water or aqueous solution selected from the group consisting of aqueous solutions containing, and interposing a peeling member, heat-bonding or pressure-bonding the image-forming substance to the peeling member to peel it from the image-holding sheet. A method for removing the image forming substance has been proposed (for example, Japanese Patent Application No. 4-2
55916). According to this, only the image forming substance can be removed without relatively damaging the paper quality of the image holding sheet.

[0006]

However, in the above-described conventional image-forming substance removing apparatus for an image-holding sheet, after the destabilizing agent is applied to the recorded image-holding sheet, the peeling member is interposed to form the image-forming substance. In the case of peeling from the image holding sheet by heat-adhesion or pressure-adhesion to the peeling member, if it is imprinted with a red stamp, a Shachihata (trade name) mark, etc., the image forming substance forming the imprint is removed. It was confirmed that there was a case where the image remained on the image-holding sheet. In this way, the image holding sheet on which the unremoved image of the imprint remains
May be deliberately abused (altered or forged).

Further, it has been found that such a residual imprint causes a new problem especially when the image forming substance is removed from both sides of the image holding sheet having images formed on both sides. That is, when the image-forming substance removing process is performed on each surface of the image-holding sheet on which images are formed on both surfaces, as long as the imprint remains on only one of the surfaces, the image on the other surface is Even if it is completely removed, this image-holding sheet cannot be easily reused. Therefore, with respect to the image holding sheet on which at least one surface has an imprint, the removal of the image forming substance on the other surface is wasted.

The present invention has been made in view of the above problems, and in removing the image-forming substance from the image-holding sheet having images formed on both sides thereof, it is possible to effectively prevent the misuse of the unremoved image including the imprint. An object of the present invention is to provide a method and an apparatus for removing an image forming substance from both sides of an image holding sheet, which enables efficient reuse of the image holding sheet.

[0009]

In order to achieve the above object, the invention of claim 1 is a method of removing an image forming substance from both sides of an image holding sheet, wherein the image forming substance adhered to the surface of the image holding sheet. When the image-forming substance present on the image-holding sheet after the removal of the image forms a stamp, all or part of the stamp is unrecognizable, and the other surface of the image-holding sheet is not recognized. It is characterized in that the image-holding sheet is stored without removing the image-forming substance. Here, in order to make part or all of the seal imprint unrecognizable, for example, a hole is punched at the position of the unremoved image on the image holding sheet, the unremoved image is smeared, or the unremoved image Apply an opaque material with the same color as the sheet on top.

According to a second aspect of the invention, in the method for removing the image-forming substance from both sides of the image-holding sheet according to the first aspect, an image in which the unrecognizable image-holding sheet is attached to the surface of the image-holding sheet. After removing the forming substance, the image forming sheet which cannot be completely removed remains on only one surface and the image holding sheet which remains on both sides are stored separately. .

The invention of claim 3 is the same as claim 1 or 2.
In the method for removing an image-forming substance from both sides of the image-holding sheet, the image-forming substance whose surface is stably attached to the image-holding sheet made of fibrous material and the state of attachment to the surface are made unstable. The peeling member is brought into contact with the image forming substance in an unstable state, and the image forming substance is peeled off from the surface and removed.

According to a fourth aspect of the present invention, sheet processing means for making all or part of the imprint of the image forming substance present on the image holding sheet unrecognizable, and the image forming substance removing means for removing the image forming substance. Before the removal process is performed, it is detected whether or not there is an image-forming substance that forms an imprint that cannot be completely removed by the process, or after the image-forming substance removal process is performed, the removal is performed by the process. Sheet surface detecting means for detecting whether or not there is an image forming substance forming the unprinted seal image on both sides of the image holding sheet, and the sheet processing means based on the detection result of the sheet surface detecting means. Sheet processing control means for controlling the operation / non-operation of the image-forming sheet, and the sheet-surface detecting means for the image-forming material forming a seal image on the surface of the image-holding sheet that is related to the preceding image-forming material removal processing Upon detecting a within and is characterized by comprising a removal processing prohibition control means for prohibiting said image forming substance removal processing for the other surface of the image holding sheet. Here, a means for making part or all of the imprint unrecognizable includes, for example, punching at a position of the unremoved image on the image holding sheet, blurring the unremoved image, It is configured such that an opaque material such as white is applied on the top.

According to a fifth aspect of the present invention, in the apparatus for removing the image forming substance from both sides of the image holding sheet according to the fourth aspect, the image forming substance is completely removed after the image forming substance removing process is performed by the image forming substance removing means. The image holding sheet in which the image forming substance that did not exist remains on only one surface or the image holding sheet in which the image forming substance that could not be completely removed remains after being subjected to the image forming substance removing processing by the image forming substance removing means In addition to the storage means for storing the sheet, a storage means for storing the image holding sheet processed by the sheet processing means is provided.

According to a sixth aspect of the present invention, in the apparatus for removing the image-forming substance from both sides of the image-holding sheet according to the fourth aspect, the sheet processing means uses the image-forming substance having substantially the same color as that of the image-holding sheet in the entire imprint. It is characterized in that it is configured to adhere to a part.

According to a seventh aspect of the present invention, in the image forming substance removing device from both sides of the image holding sheet according to the fourth, fifth or sixth aspect, the image forming substance removing means is made of a fibrous surface. An image forming substance that is stably attached to the image holding sheet, an adhesion destabilizing unit that makes the adhesion state of the surface unstable, and a peeling member for the unstable image forming substance. It is characterized in that it comprises a peeling means which is brought into contact with and peels off the image forming substance from the surface.

[0016]

According to the first aspect of the invention, when the image-forming substance present on the image-holding sheet constitutes the imprint after removing the image-forming substance adhering to the surface of the image-holding sheet, Those in which all or part of the imprint is made unrecognizable to completely prevent misuse of the image holding sheet with the imprint remaining, or the image holding sheet with the imprint remaining has been subjected to the image forming substance removal processing. The image holding sheet is easily misused by making it easy to understand. Further, in this case, the image-forming substance is not removed from the other surface of the image-holding sheet, and the image-holding sheet is stored to remove unnecessary image-forming substance from the other surface. Do not do.

According to a second aspect of the invention, in the method for removing the image forming substance from both sides of the image holding sheet according to the first aspect, the unrecognizable image holding sheet is attached to the surface of the image holding sheet. After removal of the image-forming substance,
The image-holding sheet in which the image-forming substance which cannot be completely removed remains only on one side and the image-holding sheet which remains on both sides are stored separately. As a result, the image holding sheet with the imprint remaining thereon is distinguished from other image holding sheets to further facilitate the management of abuse prevention.

According to the third aspect of the invention, in the method for removing the image-forming substance from both sides of the image-holding sheet according to the first or second aspect, the surface of the image-holding sheet is stably attached on the image-holding sheet having a fibrous structure. The adhered state of the image forming substance and the surface is made unstable, the peeling member is brought into contact with the image forming substance in the unstable state, and the image forming substance is peeled and removed from the surface. This reduces damage to the fibrous surface of the image holding sheet due to the removal of the image forming substance.

According to the present invention, the sheet surface detecting means forms an image forming a seal imprint that cannot be completely removed by the image forming substance removing means before the image shape removing processing is performed by the processing. Whether or not a substance is present, or whether or not there is an image-forming substance that forms a seal image that has not been completely removed by the image-forming substance removing process after the image-forming substance removing process is performed, on both sides of the image-holding sheet. Detect about. Then, the sheet processing control means controls the operation / non-operation of the sheet processing means based on the detection result of the sheet surface detection means, and the seal imprint of the image holding sheet which cannot be completely removed by the image forming substance removal processing. Make all or part unrecognizable. As a result, it is possible to completely prevent misuse of the image holding sheet on which the imprint remains, and to easily understand that the image holding sheet on which the imprint remains has been subjected to the image forming substance removal processing. , It is difficult to abuse this image holding sheet. Then, when the sheet surface detecting means detects the presence of the image forming substance forming the seal image on the surface of the image holding sheet on which the preceding image forming substance removal processing is performed, the removal processing inhibition control means causes the removal of the image holding sheet. The image forming substance removal processing on the other surface is prohibited. As a result, unnecessary image forming substance removal processing is not performed on the other surface.

According to a sixth aspect of the invention, in the apparatus for removing the image-forming substance from both sides of the image-holding sheet according to the fourth aspect, the sheet processing means is used to form an image-forming substance of substantially the same color as the image-holding sheet. Or, by attaching it to a part, all or part of the imprint is made unrecognizable. (Hereafter, margin)

Further, in the invention of claim 7, in the image forming substance removing device from both sides of the image holding sheet of claim 4, 5 or 6, the image of which the surface is made of fibrous material by the adhesion destabilizing means. After making the adhesion state of the image forming substance stably adhering on the holding sheet and the surface unstable, the peeling member brings the peeling member into contact with the image forming substance in the unstable state. , Peeling off the image-forming substance from the surface.

[0022]

EXAMPLES The present invention will now be described with reference to an image holding method in which a heat-melting toner (hereinafter referred to as a toner) as an image forming substance is removed from a transfer paper as an image holding sheet on which an image is formed by a transfer type electrophotographic copying machine. An embodiment applied to a device for removing an image forming substance from a sheet (hereinafter referred to as a toner removing device) will be described.

FIG. 1 is a front view showing a schematic structure of the toner removing device according to the first embodiment. First, the overall outline will be described. This toner removing device includes a sheet feeding unit 1 for feeding and separating, one by one, transfer sheets on which toner images are formed, which are accommodated in a cassette (not shown) in a stacked state. A liquid application unit / toner peeling unit 6 for supplying a liquid to the transfer paper sent from the unit 1 and peeling and removing the toner from the transfer paper supplied with the liquid, and a drying process for drying the transfer paper from which the toner is removed. A unit 4 and a paper receiving unit 5 having a plurality of paper discharge trays 501a to 501d are provided.
Further, there is also provided a sorting unit 40 for sorting and sending the transfer paper from the drying unit 4 to any one of the plurality of paper discharge trays 501a to 501d of the paper receiving unit 5, and the transfer paper is turned inside out in the apparatus. A circulation path is also formed for circulation. Further, there is also provided an identification mark giving unit 30 as an identification mark giving means for giving an identification mark to the transfer paper from the drying unit 4 if necessary. Hereinafter, each unit will be described in detail.

The sheet feeding unit 1 feeds the transfer sheets stacked in a cassette (not shown) from the top, for example, and separates the double feed by a pair of separating rollers (not shown) to form a single transfer sheet. Only a pair of registration rollers for timing adjustment and skew correction is sent out. The specific configuration and operation 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 / toner peeling unit 6 performs a toner image removing process from the transfer paper, and the clamp holding claw 602 clamps the front end of the transfer paper to hold it on the peripheral surface and rotates the paper holding drum. An application roller 2 that includes, for example, a sponge roller or the like for supplying a liquid to the transfer paper so as to come into contact with the transfer paper on the drum 601.
07 and a peeling belt 308 as a peeling member supported by a supporting roller are provided.

The application roller 207 transfers the treatment liquid as a destabilizing agent that makes the adhesion state of the toner stably adhering to the surface of the transfer paper and the surface thereof unstable on the paper holding drum 601. It is for applying to paper, and the processing liquid is supplied by the liquid supply device 208. Further, the application roller 207 is configured to be capable of being brought into contact with and separated from the drum 601, and the toner can be partially removed by the operation of bringing the application roller 207 into and out of contact. Separately from the treatment liquid, a penetration promoting liquid as a penetration promoting agent for promoting the penetration of the treatment liquid into the transfer paper is applied to the transfer paper on the drum 601 by a coating roller different from the coating roller. It can also be configured to do so.

Here, the treatment liquid is at least one 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. Water or an aqueous solution can be used. Further, the water or the aqueous solution may contain a predetermined organic solvent. Moreover, only an organic solvent can be used as the treatment liquid. Further, the permeation promoting liquid 21 is at least one kind of water or an aqueous solution selected from the group consisting of 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. Etc. can be used.

Examples of the above water-soluble polymers include starchy substances (branch starch, potato starch, tapioca starch, wheat starch, corn starch, etc.), mannan (konjac, etc.), seaweeds (funnel, agar, sodium alginate, etc.), Natural polymers such as plant mucilage (trolooi, tragacanth, gum arabic, etc.), microbial mucilage (dextran, levan, etc.), protein (nikawa, gelatin, casein, collagen, etc.), and cellulosic (viscose, methylcellulose, ethylcellulose, etc.) Hydroxyethyl cellulose,
Examples thereof include, but are not limited to, semi-synthetic polymers of starch type (soluble starch, carboxymethyl starch, dialdehyde starch), synthetic polymers and the like.

Examples of the above-mentioned surfactants include anionic (carboxylic acid salt, sulfonic acid salt, sulfuric acid ester salt, phosphoric acid ester salt, phosphonic acid salt, etc.) and cationic (amine salt, quaternary salt). Ammonium salt, benzalkonium salt, benzethonium chloride salt, pyridinium salt, imidazolinium salt, sulfonium salt, polyethylene polyamine, etc.), amphoteric system (amino acid, carboxybetaine, sulfobetaine, aminosulfate, aminocarboxylate,
(Imidazoline derivative, etc.), non-ionic type (ether type, ether ester type, ester type, nitrogen-containing type, polyhydric alcohol, amino alcohol, polyethylene glycol, etc.)
However, the present invention is not limited to these.

As the organic solvent contained in the water or the aqueous solution, turpentine, dipentene, butyl acetate, carbon tetrachloride, cellosolve acetate, xylene,
Toluene, ethyl acetate, diacetone alcohol,
Examples thereof include, but are not limited to, methyl cellosolve acetate, benzene, methyl ethyl ketone, methyl acetate, methylene chloride, ethylene dichloride, cyclohexane, cellosolve, dioxane, acetone, methyl cellosolve, cyclohexanol, butanol and the like.

As the organic solvent used alone,
Hexane, heptane, octane, which are hydrocarbon solvents
Nonan, Spirit, Naphtha N01 ~ 6 (trade name of Shell Petroleum Co.), Isopar E, L, K, V (trade name of Exxon Co.), IP Solvent (trade name of Idemitsu Petroleum Co.), Shell-sol 70, 71, Solvesso 100,1
50 (trade name of Shell Oil), Ascom OMS, 4
60 (trade name of Spirits), Vegasol 1030,
2130, 3040 (trade name of Mobil Oil Co., Ltd.) and the like. Furthermore, Fluorinert FC which is a fluorine-based solvent
40,43,70,77 (trade name of Sumitomo 3M), Aflude E10,16,18, etc., and silicone solvent Shin-Etsu Silicone KF96 (trade name), Toray Silicone SH200,344 (trade name), Toshiba Silicone TSF
431 (trade name) and the like, but the invention is not limited thereto.

The peeling belt 308 is for peeling and removing the toner from the transfer paper on the paper holding drum 601 to which the processing liquid has been supplied, and the surface thereof is
At least the softened toner has a larger adhesive force than the adhesive force between the transfer paper and the toner. Specifically, a toner component resin which is the same as or similar to the above toner, a component resin of an adhesive, or the like can be used, and a metal material such as an aluminum-based, copper-based, nickel-based, or iron-based material can also be used. However, it is not limited thereto. The resin may be water-soluble or water-insoluble.

Examples of the toner component resin include polystyrene resin, acrylic resin, methacrylic resin, styrene-butyl acrylic copolymer, styrene-butadiene copolymer, polyester resin, epoxy resin, and the like. It is not limited.

As the component resin of the adhesive, protein adhesives such as glue, gelatin, albumin and casein, and carbohydrate adhesives such as starch, cellulose and complex polysaccharides (eg gum arabic, tragacanth etc.) , Vinyl acetate polymers and copolymers, acrylic adhesives, ethylene copolymers, polyamide, polyester, polyurethane and other thermoplastic adhesives, polychloroprene adhesives, nitrile rubber adhesives, recycled rubber adhesives, SBR adhesives, natural rubber adhesives, etc. Rubber-based adhesives, rubber-based, acrylic-based pressure-sensitive adhesives, polyethylene terephthalate in which titanium oxide is dispersed (PE
T), etc., but not limited thereto.

When such a resin is used, it is desirable to have a multi-layer structure of at least two layers of a support and a surface layer from the viewpoint of preventing elongation due to tension and heat, durability and the like. Examples of the support that supports the resin or the like include a sheet, cellophane tape, kraft paper adhesive tape,
Tapes such as polyvinyl chloride tape, acetone tape, and filament reinforcing tape can be used, but are not limited to these. A roller-shaped peeling member may be used instead of the belt-shaped peeling member as in the illustrated example. In this case, a peeling member can be formed by forming a surface layer made of the above resin or the like on a base roller having elasticity, for example, as a support.

Of the supporting rollers of the peeling belt 308, the supporting roller 301 facing the paper holding drum 601.
The heating lamp 301 has a built-in heating lamp 301 as a toner softening means. The heating lamp 301 heats and softens the toner adhering to the transfer paper, thereby facilitating peeling of the toner from the fibers of the transfer paper. It is desirable that this heating is performed to such an extent that the toner on the transfer paper does not melt at the pressure contact portion between the drum 601 and the belt 308. This is because if the toner melts, it becomes difficult to transfer the toner on the transfer paper to the peeling belt 308 side without dividing the toner on the paper side and the peeling belt 308 side. If it is heated too much, the peeling belt 308 and the drum 60
The transfer paper is too dry while passing through the pressure contact portion with 1, and the fixing force of the toner to the transfer paper is stronger than that when the transfer paper is wet, and the transfer paper passes through the toner and the peeling belt 308.
There is a risk that it will stick to and become unseparable. Therefore, it is desirable to heat the transfer paper after passing through the heating unit to such an extent that a small amount of damp air remains and re-adhesion of the toner can be prevented.

On the surface of the peeling belt 308,
A cleaning blade 309 for removing the toner on the surface of the peeling belt 308 contacts the toner collecting container 307 for collecting the toner scraped off by the blade 309.
Is also attached. Instead of using such a blade 309, a cleaning roller may be used.

Then, downstream of the peeling belt 308 in the rotation direction of the paper holding drum 601, as a detecting means for detecting an unremoved image remaining on the transfer paper held by the drum 601 after the toner peeling process. Of CC
A D sensor 603a is provided.

The drying unit 4 is for drying the transfer paper, and is composed of a pair of drying rollers 402 made of, for example, aluminum and having a built-in heating lamp 401. At least one of the rollers 402, for example, the upper roller, may be provided with a surface layer made of a liquid-supplying member, and a diaphragm blade for squeezing the liquid in the surface layer may be brought into contact therewith. Further, instead of such a drying roller pair 402, a belt-shaped member, a hot air fan, an infrared lamp, or the like may be used.

The paper receiving unit 5 includes the first to fourth four
One paper discharge tray 501a-d is provided and discharge rollers 502a-d are provided corresponding to each tray. The plurality of paper discharge trays are provided in this way, as described later, so that the transfer paper after the toner removal processing is separately stored depending on the presence or absence of an unremoved image or the presence or absence of a seal image.

The sorting unit 40 has a guide plate for feeding the transfer paper from the drying unit 401 to the discharge trays 501a to 501d of the paper receiving unit 5 and the circulation path, and the discharge trays 501a to 501d. Any one of the above or the above-mentioned deflecting claws 42a to 42d provided corresponding to each tray for selectively feeding the transfer paper to the circulation path. The positions of these deflecting claws 42a to 42d are controlled by, for example, solenoids 650a to 650d (see FIG. 2) according to control data from a control unit 9 described later.

The above circulation path includes a plurality of conveying rollers 60-.
A switchback path 65 for reversing the front and back of the transfer paper is formed in a part of this circulation conveyance path. Specifically, the forward / reverse transporting row 66 capable of normal / reverse rotation and the sorting unit 40 described above.
A switchback path 65 is formed by the driven roller 67 that comes into contact with one roller of the pair of transport rollers 60 located immediately after, and the guide plate. This circulation path uses a toner removing process for one surface by the liquid applying unit / toner peeling unit 6 so that the toner can be automatically removed from both surfaces of the transfer paper on which the toner images are formed. It is for reversing the front and back of the transfer paper which has been subjected to the above, and sending it again to the liquid applying unit / toner peeling unit 6. The switchback path 65 is provided with a paper sensor 68, such as an optical sensor, for detecting the leading and trailing edges of the transfer paper for controlling the rotation of the forward / reverse transport roller 66. Further, the sheet feeding unit 1 is provided at the end of the circulation path.
A displaceable guide claw 69 is provided for also using a part of the transport path from the cassette (not shown) to the paper holding drum 601 as a transport path from the circulation path to the paper holding drum 601.

The identification mark giving unit 30 is for treating the transfer paper so as not to misuse the transfer paper having the imprint remaining which cannot be removed by the liquid applying unit / toner peeling unit 6 and is used as the transfer paper. It is composed of a punching unit that punches holes as identification marks, a printing unit that prints a predetermined identification mark on the transfer paper, and the like. A CCD 603b for detecting the transfer paper surface that has undergone the toner removal processing by the liquid applying unit / toner peeling unit 6 is provided on the upstream side of the discrimination mark giving unit 30, and the detection data from this CCD 603b is given. It is used to control the operation of the unit 30.

3 (a) and 3 (b) are a front view and a perspective view of a punching unit which is an example of the structure of the identification mark giving unit 30. As shown in FIG. This punching unit includes a movable punch main body 31, a drive motor 32 controlled by the controller 9, a feed screw 33 rotationally driven by the drive motor, and a guide rail 3 for guiding the movable punch main body 31 in the direction of arrow A in the figure.
4, transfer roller 35 for transfer paper 10, transfer guide member 3
6, a drive unit (not shown) for the transport roller 35, and the like.

The movable punch main body 31 has a cylindrical punch member 31a and a punch member 3 each having a sharpened tip end.
An arm portion 31b to which 1a is fixed, a drive portion 31d which is controlled by the control portion 9 and drives the punch member 31a in the vertical direction (direction of arrow B in the figure) via the arm portion 31b,
The punch table 31f is formed with a hole 31e at a position where the lowered punch member is engaged. Also,
A through hole is formed in a side wall portion of the movable punch body 31 through which the feed screw 33 penetrates, and an internal thread is formed on an inner peripheral surface of the through hole so as to be screwed with the feed screw 33 (male thread). It has been cut. Then, the feed screw 33 is inserted into the through hole of the movable punch main body 31 in which the internal thread is cut while being screwed. As a result, the movable punch main body 31 can reciprocate in the direction of arrow A according to the rotation of the feed screw 33.

In the punching unit, the transfer paper 10 conveyed from the drying unit 4 is conveyed from the left side of the drawing onto the punch base of the movable punch main body 31, and the CC
When the unremoved image on the transfer paper 10 is detected by the D sensor 603b, the conveyance roller 35 is drive-controlled so as to be stopped at a predetermined position previously obtained from the punch position data. The punch position in the direction (arrow A direction) orthogonal to the transfer paper conveyance direction is controlled by rotating the feed screw 33 by the drive motor 35 and moving the movable punch body 31. After the control of the punch position is completed, the driving unit 31c is operated to lower the punch member 31a via the arm unit 31b to punch the transfer paper 10. Here, the number of punches may be one, but a plurality of punches may be formed.

FIG. 4 is a perspective view of a printing unit which is another example of the structure of the identification mark giving unit 30. This printing unit is an inkjet type, and has a nozzle head 37 having three jet nozzles and fixed to a holder 37a, a guide rod 38 that penetrates the holder 37a and guides the movement of the nozzle head 37, and a drive unit of the nozzle head 37. It is equipped with 39 and the like. The drive unit 39 includes a drive motor 39a, a drive pulley 39b fixed to the rotation shaft of the drive motor 39a, a driven pulley 39c, a drive wire 39c fixed to a nozzle head holder 37a and suspended between the pulleys 39b and c, and the like. Has been done. By the rotation of the drive motor 39a, via the drive wire 39c,
The nozzle head 37 moves in a direction orthogonal to the transfer paper conveyance direction. Each jet nozzle of the nozzle head 37 and the drive motor 39a are connected to the driver 910 of the control unit 9.

In the printing unit, the transfer paper 10 conveyed from the drying unit 4 is conveyed in the direction of the arrow, and the nozzle head 37 is controlled by the drive motor 39a.
Are moved in a direction orthogonal to the transfer paper conveyance direction. Then, ON / OF of each jet nozzle of the nozzle head 37
By controlling F at a predetermined timing, the transfer paper 1
An identification mark such as an X mark or a O mark is attached to the entire surface of the transfer paper 10 so that 0 cannot be used. During this print control, the transfer paper 10 does not have to be stopped, but may be controlled so that the transfer paper 10 is stopped when the nozzle head 37 moves and the jet nozzles print.

The printing unit may recognize the position of the unremoved image on the transfer paper 10 and may control the printing at that position. In this case, the CCD sensor 60
Based on the position data of the unremoved image detected in 3b, the movement control of the nozzle head 37 by the drive motor 39a, the ON / OFF timing control of the jet nozzle, and the like are performed, and the identification mark is printed on the unremoved image. At this time,
Ink of the same color as the transfer paper 10, for example, white ink may be used.

Further, in the configuration example of the printing unit shown in FIG.
Although the jet nozzles are configured to move in a direction orthogonal to the transfer paper conveyance direction, as shown in FIG. 5, the nozzle heads 3 in which the jet nozzles are arranged in the entire width of the transfer paper 10 are arranged.
7 may be arranged on the transfer paper 10.

By the identification mark giving unit 30 as described above, a hole as an identification mark is printed or printed on the unremoved image so that the unremoved image on the transfer paper 10 cannot be recognized later. Can be controlled. For example, in the punching unit shown in FIG.
Based on the position data of the unremoved image detected by the CD sensor 603b, the drive motor 32 controls the movement of the movable punch main body 31, the drive control of the transport roller 35, and the punch member 31.
Punching is performed on the unremoved image by performing drive control of b.
By thus providing the identification mark on the unremoved image, the transfer paper 10b in which confidential information is leaked and unremoved images such as marks and signatures remain when the transfer paper 10 is accidentally discarded. It becomes possible to further prevent the abuse (alteration and forgery) of.

Further, an image such as a red stamp or a killer whale stamp remains as a non-removed image, and a transfer paper which may be misused,
It is also effective to smear the seal imprint of the stamp as a method to prevent it from being abused. As the treatment liquid for bleeding the imprint, a hydrocarbon solvent, an acetone solvent, or the like can be used for the red mark, and water, alcohol, or the like can be used for the killer whale mark. In the case of a stamp using ink on the stamp table, water, alcohol or the like can be used. Further, for example, even when a signature made in place of or in addition to the stamp is made with a ballpoint pen or the like, if this remains as an unremoved image, it may be misused. As a processing liquid for bleeding such a signature (hereinafter, referred to as a blank space), an alcohol or acetone solvent or the like can be used in the case of a ballpoint pen, and water or the like in the case of a fountain pen. Therefore, as the identification mark imparting unit 30, a device that supplies such a processing liquid to the transfer paper to bleed the imprint may be used. Further, the processing liquid that causes such bleeding may be supplied to the transfer paper held on the paper holding drum 601. In this case, it is desirable that the CCD 603a, which is arranged so as to face the paper holding drum 601, also serves as a seal imprint presence determination. Further, the treatment liquid which causes such bleeding may also be used as a destabilizing agent for the adhesion between the transfer paper surface and the toner.

Next, referring to FIG. 5, the control section 9 as a control means for operating the toner removing device will be described. FIG. 5 is a control block diagram for operating the toner removing device of FIG. In FIG. 5, when the main switch 902 is turned on, a DC power supply voltage is supplied to each control IC from a direct current power supply (PSU) 903 which receives an alternating current from the commercial power supply 901. CP
The U904 resets a program counter and the like when power supply is started, and starts control based on the program content written in the ROM 905. CLK that supplies a reference clock (CLK) necessary for CPU operation The oscillator 906 is connected.

To the CPU 904, in addition to the ROM 905 via the address data bus 907, each roller 30 is connected.
RAM 91 in which control temperatures of 1a and 401 are written
9, an A / D converter 918, a parallel interface 908, a serial interface 921, etc. are connected. The A / D converter 918 includes the peeling belt support roller 3 in addition to the CCDs 603 and 603b.
01a and the drying roller 404 are connected to the temperature detecting thermistors 916 and 917, respectively. The output port of the parallel interface 908 has a paper feed motor 923, a registration motor 924, and a main drive motor 9
22, relay 9 for supplying voltage to each lamp 301, 401
11 contact drive coil 911, each lamp 301, 401
Solid state relay for lighting control SSR1 (91
2), SSR2 (913), solenoid 926 for clamp claw 602, solenoid 20 for moving coating roller 207.
7. A driver 910 such as solenoids 950a-d for the deflection claws 42a-d is connected, and a paper end sensor 925 for detecting the presence / absence of paper in the cassette of the paper feeding unit 1 is connected to its output port. To the serial interface 921, the operation display control unit 920 of the toner removing device and the identification mark providing unit 30 control unit 930 are connected. The rotation of the peeling belt 308 and the rotation of the coating roller 207 are synchronously driven by the main drive motor 922.

Next, the operation of the toner removing device will be described. Transfer paper with images formed on both sides can be reused as transfer paper for double-sided recording with the images removed on both sides. Unremoved image remains on only one side and the other side is used for image recording. There are three types: those that can be reused and those that cannot be reused because there are unremoved images on both sides. Among these, the images in which the unremoved image remains on at least one surface are roughly classified into those in which the unremoved image is likely to be misused such as a seal imprint and those in which it is not. The following is a detailed classification of transfer sheets having images formed on both sides by combining the above viewpoints. Reusable as transfer paper for double-sided recording with images removed on both sides Only unremoved images with less risk of misuse remain on only one side, and the other side can be reused as is Only unremoved images that are less likely to remain and cannot be reused as they are At least one surface that has imprints that are highly likely to be misused and requires preventive measures against misuse, etc.

Therefore, in the present embodiment, the above
It is determined which of the transfer papers is the transfer paper, and after performing a predetermined process as necessary, the transfer papers are stored in the four discharge trays 501a to 501d as described above. Further, with respect to the above-mentioned transfer paper which requires processing such as abuse prevention, the identification mark giving unit 30 performs processing such as punching holes.

FIG. 6 shows an example of control for performing such an operation. First, as a device start-up operation after turning on the device power (not shown), data for turning on the relay 909 is sent from the CPU 904 to the parallel interface 908 through the address data bus 907, and is sent via the driver 910 connected to the output port of the parallel interface. , Contact drive coil 9 of relay 911
11a is energized to close the contact of the relay 911. Then, the data for turning on the solid state relays SSR1 (912) and SSR2 (913) are sent to the driver 910 in the same manner as described above, and the driver 910
The SSR1 (912) is turned on via, a current flows through the heating lamp 301 that heats the peeling belt 308, and heating of the roller 302 is started. Furthermore, the driver 9
The SSR2 (913) is turned on via 10 and a current flows through the heating lamp 401 for heating the drying roller 402 to start heating of the roller 402. Each roller 30
The temperatures of 2,402 are thermistors 916 and 91, respectively.
7 is detected and input to the A / D converter 918 to be converted from analog data to digital data. RAM
The control temperature of each roller is written in 919, and the temperature is controlled by comparing with that value. The control temperature data can be written in the RAM 919 from the control unit 920 of the operation display unit 50 through the serial interface 921. When the temperature of each of the rollers 301a and 402 reaches a temperature (setting value of RAM) sufficient for peeling or drying, an operable display (LED lighting or the like) is displayed on the operation display unit via the control unit 920. .

When the operation command data is transmitted from the control section 920 of the operation display section in the state where the above apparatus start-up operation is completed, the CPU 904 operates the main drive motor 922, and the paper holding drum 601 and the peeling belt 308. When the application roller 207 and the like are rotated and the load of the motor 922 can be driven at a constant speed, the paper feeding motor 923 is driven to start paper feeding. The registration motor 924 rotates while timing with the paper feed motor 923 to prevent skew, and sends the transfer paper toward the paper holding drum 601.

Then, as shown in the figure, the transfer paper surface facing up (hereinafter referred to as the first surface) and the transfer paper surface facing downward (hereinafter referred to as the second surface) when fed from the paper feeding unit 1. It is determined whether or not images are present on both sides of (refer to step 1) (step 1). This determination may be performed by disposing an image presence / absence detection sensor so as to face each surface and using a signal from the sensor to make a determination, or the operator may input ten keys from the operation display unit in advance. Alternatively, the determination may be made using the input signal.

First, the case where it is determined that the image does not exist on both sides (N in step 1), that is, the case where the image exists on only one of the first surface and the second surface will be described. In this case, it is then determined whether the image exists on the first surface (step 2). When it is determined that the image exists on the first side, the paper holding drum 601
The control data for closing the clamp claw 602 of the above is sent to the parallel interface 908, and the solenoid 926 is operated by the driver 910 to clamp the transfer paper.
2 hold it on the paper holding drum 601 and set the drum 601 to 1
Rotate. During this time, the transfer liquid is applied to the transfer paper by the application roller 207, and in a state where the peeling liquid permeates the interface between the transfer paper and the toner, the toner is transferred onto the transfer paper at the interface where the processing liquid permeates by the peeling belt 308. It is peeled off and removed (step 4). During this rotation, the CCD sensor 603a detects the surface of the transfer paper, and the A / D converter 9
Using the detection data sent to the CPU 904 via 18, it is determined whether or not an unremoved image remains (step 5).

When no unremoved image remains (Y in step 5), control data for opening the clamp claw 602 is sent to the parallel interface 908, and the driver 91
The operation of the solenoid 926 is stopped by 0, and the clamp claw 602 is opened, whereby the transfer paper is separated from the paper holding drum 601. Then, the transfer paper is dried by the drying unit 4, and the identification mark giving unit 30 in the inoperative state is obtained.
Through the first deflecting claw 42a of the sorting unit 40, and the sheet is discharged to the first sheet discharging tray 501a and stored therein (step 6). When the unremoved image remains (N in step 5), the counter N for counting the number of continuous toner processes is counted up, and the toner is checked while judging whether or not the number exceeds the predetermined number b. The removal process and the check using the output of the CCD sensor 603a are repeated (steps 4, 5, 7, and 8). If it is determined that no unremoved image remains during this period (Y in step 5),
Similarly, the paper is discharged to the first paper discharge tray 501a and stored therein.

On the other hand, when the number of times b is exceeded a predetermined number of times while the unremoved image remains, the clamp claw 602 is opened to separate it from the paper holding drum 601, and is dried by the drying unit 4, and A /
Whether or not the unremoved image is a seal image is determined by the presence / absence determination of the shape of, for example, a circle or a quadrangle using the detection data of the CCD 603b sent to the CPU 904 via the D converter 918 (step 9). This judgment is based on the CCD 6
03a and a CCD sensitive to red or a color close to red may be used together to determine whether or not the shape and color are imprints of red ink. The detection data from the CCD 603b is written in the RAM 919 and is also used for control in the identification mark giving unit 30, the sorting unit 40, and the like.

If it is determined that the imprint remains (Y in step 9), the identification mark giving unit 30
To open the punch hole, print ○, ×, etc. so that it overlaps the seal imprint or not overlap it, form a solid image so that the entire seal imprint is hidden, or apply a special liquid. After applying and smearing the imprint (step 10), the sheet is ejected to the fourth sheet ejection tray 501d by the fourth deflecting claw 42d of the sorting unit 40 and stored therein (step 29).

On the contrary, when it is determined that the imprint does not remain, the identification mark giving unit 30 in the inoperative state is passed, and the second deflecting claw 42b of the sorting unit 40 discharges the sheet to the second sheet discharge tray 501b. Keep it in this. Here, the first surface of the second discharge tray 501b on which the unremoved image of the transfer paper remains faces upward.

The above is the processing in the case where the image exists only on the first side of the transfer sheet. However, when it is determined in step 2 that the image exists only on the second side (N in step 2), Immediately after this determination, without being held by the paper holding drum 601, the drying unit 4, the identification mark giving unit 30, and the sorting unit 40 in the inoperative state are passed through, and the paper holding drum 601 is turned upside down in the circulation path. The same operation is performed except that the above is held. That is,
When the image on the second side of the transfer sheet can be removed, the transfer sheet is stored in the first paper discharge tray 501a, and the image on the second side is removed by repeating the toner removing process within a predetermined number of times. If the unremoved image remains and the image includes a seal imprint, the identification mark giving unit 30 performs a predetermined process and then stores the image in the fourth paper discharge tray 501d.
Further, when the toner removal processing is repeated within a range not exceeding the predetermined number of times, the image on the second side cannot be removed, and an unremoved image remains, and when the image does not include the imprint, the second paper ejection tray 501b is displayed. Have it stored. The transfer paper on which the unremoved image remains on the second surface also faces upward on the second discharge tray 501b on the tray.

Next, the case where it is determined in step 1 that images are present on both sides (Y in step 1) will be described. In this case, first, the toner removal processing for the first surface is started (step 12). The toner removal processing for the first surface is also performed within a range not exceeding the predetermined number b (steps 13, 19, 20, 12), and when the image on the first surface can be removed (Y in step 13), Toner removal processing for the second surface starts (steps 14, 30, 15, 1)
6, 17). When the process for removing the toner on the second surface is started, the clamp claw 602 is once opened to separate the transfer paper from the paper holding drum 601, and the drying unit 4, the identification mark giving unit 30, and the sorting unit 40 in the inoperative state are passed. Then, after reversing the front and back in the circulation path (step 14)
Then, the toner is removed from the paper holding drum 601 within a predetermined number of times (steps 30, 1).
5, 16, 17).

When the image on the second surface can also be removed by the toner removal processing on the second surface (Y in step 15), the transfer paper is separated from the paper holding drum 601 by opening the clamp claw 602. It is dried by the drying unit 4 and is passed through the identification mark giving unit 30 in the inoperative state, and the first deflecting claw 42a of the sorting unit 40 causes the first paper discharge tray 50.
The paper is discharged to 1a and stored therein (step 6).

In contrast to this, when the toner removal processing is repeated for the second surface within the predetermined number of times, the image on the second surface cannot be removed and an unremoved image remains (N in step 17). When the image includes the imprint (Y in step 18), the identification mark giving unit 30 is operated in the same manner as in step 10 to perform a predetermined process (step 10), and then the fourth sorting unit 40. The sheet is discharged to the fourth sheet discharge tray 501d by the deflecting claw 42d and stored therein (step 29). Further, when the toner removal processing is repeated for the second surface within a predetermined number of times, the image on the second surface cannot be removed, and an unremoved image remains (N in step 17), and the image is imprinted. Is not included (N in step 18), the identification mark giving unit 30 in the inoperative state is passed and the sorting unit 40
The sheet is ejected to the second sheet ejection tray 501b by the second deflecting claw 42b and stored therein. Here, the second output tray 50
The second surface of the transfer paper 1b on which the unremoved image remains remains facing upward.

By repeating the toner removal processing for the first surface within the predetermined number of times, the image on the first surface could not be removed and an unremoved image remained (N in step 26).
At times, it is determined whether or not the toner removal processing for the second surface is performed depending on whether or not the unremoved image includes a seal image. That is, when the image includes the imprint (Y in step 27), the identification mark giving unit 30 is operated in the same manner as in step 10 described above without performing the toner removal processing on the second surface, and the predetermined processing is performed. After that (step 10), the sheet is discharged to the fourth sheet discharge tray 501d by the fourth deflecting claw 42d of the sorting unit 40 and stored there (step 29).

On the contrary, when the image does not include the imprint,
Once the clamp claw 602 is opened to transfer the transfer paper to the paper holding drum 6
After being separated from 01, passed through the drying unit 4, the identification mark giving unit 30, and the sorting unit 40 in the inoperative state, and turned upside down in the circulation path (step 22),
The toner removal processing for the second surface is performed in which the toner is removed from the paper holding drum 601 within a predetermined number of times b (steps 23, 24, 25, 26).

When the toner removal processing on the second surface also removes the image on the second surface (Y in step 24), the transfer paper is separated from the paper holding drum 601 by opening the clamp claws 602, and the drying unit. 4 and the identification mark giving unit 30 in an inoperative state is passed through, and the second deflecting claw 42b of the sorting unit 40 causes the second discharge tray 5
Paper is discharged to 01b and stored in it (step 1
1).

Since the unremoved image remains only on the first surface of this transfer paper, the unremoved image remains when the paper is directly discharged to the second paper discharge tray 501b after the toner processing on the second surface. The first surface faces downward on the tray 501b. In this case, the image exists on only one surface of the transfer paper, and the image cannot be completely removed, and the transfer paper stored in the tray 501b or only the image on the second surface of the double-sided images is removed. The transfer paper stored in the tray 501b cannot be completely used, and the direction of the unremoved image is opposite to that of the transfer paper. Therefore, it is necessary to manually align the direction of the reusable surface during reuse. Therefore, in order to save such trouble, it is desirable to reverse the transfer paper in this case before discharging the transfer paper to the second paper discharge tray 501b. For example, before the sheet is discharged to the tray 501b, the sheet is passed through the sorting unit 40 and the circulation path, turned upside down, and then discharged to the sheet discharge tray 501b. As a matter of course, so that the surfaces of the unremoved images are aligned downward on the paper discharge tray 501b, conversely, there is an image only on one surface of the above-mentioned transfer paper, and the image cannot be completely removed, The tray 501b
It is also possible to reverse the front and back sides of the transfer paper stored in the tray 501b or when discharging the transfer paper stored in the tray 501b without being able to completely remove only the image on the second side of the images on both sides. .

In contrast to this, when the toner removal processing is repeated for the second surface within the predetermined number of times, the image on the second surface cannot be removed and an unremoved image remains (N in step 26). When the image includes the imprint (Y in step 27), the identification mark giving unit 30 is operated in the same manner as in step 10 to perform a predetermined process (step 10), and then the fourth unit of the sorting unit 40. The sheet is discharged to the fourth sheet discharge tray 501d by the deflecting claw 42d and stored therein (step 29). Further, when the toner removal processing is repeated for the second surface within the predetermined number of times, the image on the second surface cannot be removed and an unremoved image remains (N in step 26), and the image is imprinted. When it does not include (N in step 27), the identification mark giving unit 30 in the inoperative state is passed through, and the sorting unit 40
The sheet is ejected to the third sheet ejection tray 501c by the third deflecting claw 42c and stored therein.

The above operation is performed by the paper end sensor 925 for detecting the presence / absence of paper in the paper feeding unit 1.
Paperless data from the parallel interface 90
Repeatedly until it is transmitted to the CPU 904 through 8, the CPU 904 that detects the absence of paper stops the machine operation,
An operation stop display (LED lighting or the like) is displayed on the operation display unit 50 via the control unit 920.

As described above, according to this embodiment, the paper holding drum 60
After removing the toner from only one surface on the sheet 1, the liquid applying unit and the toner peeling unit 6 are again passed through the sorting unit 40 and the circulation path and turned upside down.
Therefore, the toner removal processing can be performed on both sides.

Further, according to this embodiment, since the circulation path for reversing the transfer paper is provided in the toner removing device,
Images can be removed from both sides of the transfer paper. (Hereinafter, blank space) Further, the transfer paper whose one surface is reusable by the toner removal processing is stored in the second paper discharge tray 501b,
Transfer paper that has unremoved images on both sides and that cannot be reused on either side is stored separately in the third discharge tray 501c, so that the two are stored separately, so manual sorting of both is unnecessary. . Therefore, the former transfer paper can be reused more easily than the case where both are stored together.
Also, transfer paper with only one side reusable
When storing in the discharge tray 501b, the unremoved images are always stored in the same direction. Therefore, when reusing, it is not necessary to manually arrange the orientation of the reusable surface by reversing the front and back. Easy to use. Further, since the one side is stored so as to face upward, the tray 50
With 1b removed from the device as needed,
It is possible to easily confirm what the unremoved image looks like from above. Further, when the unremoved image is the seal image, the identification mark imparting unit 30 performs a predetermined process on the transfer sheet, so that the transfer sheet having the seal image remaining thereon can be prevented from being misused.

Further, if the imprint that cannot be completely removed remains on the surface of the transfer paper having images on both sides that has been subjected to the toner removal processing first, the transfer paper is not subjected to the toner processing on the other surface and the transfer paper is removed. Since it is stored, the processing time for transfer paper that should not be reused can be shortened compared to the case where toner processing is performed on both sides. Further, the transfer paper on which the imprint that cannot be completely removed remains is the fourth paper ejection tray 501d, and the transfer paper on which the unremoved image that cannot be completely removed except the imprint remains on the second paper ejection tray 501b. The transfer paper on which the non-removed image other than the imprint cannot be removed is the third paper ejection tray 501c.
So, because they are stored in separate trays,
It is possible to eliminate the need for manual sorting for subsequent processing such as whether or not reuse is possible and whether or not cutting is required to maintain confidentiality.

Further, according to this embodiment, the liquid is supplied to the transfer paper to which the toner adheres, and the toner is peeled off while the liquid permeates into the interface of the transfer paper with the toner, so that the paper fiber is damaged. The toner can be removed without

In the above embodiment, when a seal imprint is included in the unremoved image, the seal imprint may be painted in the same color as the transfer paper so that the surface having the seal imprint can be reused. For this purpose, a means for detecting the color of the transfer paper and a printing unit equipped with, for example, an ink jet nozzle that fills the imprint with a color similar to the detection color among the inks of a plurality of colors that was previously prepared is used. To do.

Further, in the above-described embodiment, only the judgment is made as to whether or not the imprint is included in the unremoved image, but instead of this, or in addition to this, handwritten characters by a writing instrument such as a felt-tip pen, etc. It is also possible to determine whether or not is included and to change the storage location depending on the result. Whether or not such a handwritten character is included can be determined based on whether or not the unremoved image is present only on a part of the entire transfer paper. This means that writing by handwriting is usually done only on a part of the entire transfer paper, while copying by an electrophotographic copying machine is almost always recorded on the entire transfer paper. It was used.

For this purpose, for example, the output of the CCD 603b for detecting the transfer paper surface after the toner removal processing in FIG. 1 is used, and by handwriting depending on whether or not the unremoved image is unevenly distributed only on a part of the entire transfer paper. Judge whether to write. FIG. 7 is a flow chart showing an example of such control. In this example, regarding the transfer paper in which the unremoved image not including the seal imprint remains on only one surface, whether or not the unremoved image is handwritten. It is determined (step 31). And if it is not handwritten,
That is, in the case of an image by a normal electrophotographic copying machine, it is stored in the second paper ejection tray 501b, and in the case of writing by handwriting, it is separate from the first to fourth paper ejection trays 501a to 501d. It is arranged to be stored in a provided fourth discharge tray (not shown). The other points are the same as the control of FIG.

According to the control for determining whether or not the writing is performed by handwriting, it is difficult to completely eliminate the unremoved image even if the toner removal process is repeated many times depending on the present toner removal method such as a pencil. The transfer paper and the number of continuous peeling treatments are limited in order to prevent the fibers of the transfer paper from being excessively damaged as in each of the above-mentioned embodiments, so that only the unremoved image remains. The transfer paper on which the unremoved image formed by the photographic method remains can be stored separately. Therefore, when the latter transfer paper is set in the paper feeding cassette of the toner removing device and the toner removing process is performed again with the preparation that the paper fibers will be damaged to some extent, the manual sorting of the two becomes unnecessary. . In addition, the handouts of important meetings are often created by using an electrophotographic copying machine, and the transfer paper on which the unremoved image remains remains is subjected to cutting and other processing. Above,
It is not necessary to manually sort the transfer paper from which only handwritten writing remains. Further, according to this control, the transfer paper on which the unremoved image that is neither the handwritten writing nor the imprint remains on only one surface is the second discharge tray 501b, and the unremoved image that is the handwritten writing remains on only one surface. The transfer paper is the fifth discharge tray, and the transfer paper on both sides of which unremoved images remain is the third discharge tray 5
Since they are stored in different trays, such as 01c, it is possible to eliminate the need for manual sorting for subsequent processing, such as whether or not reuse is possible and whether or not cutting is required to maintain confidentiality.

Since the transfer paper stored in the fifth paper discharge tray may contain such highly confidential paper, a cutting machine (shredder) is attached to the toner removing device. It is also possible to attach the transfer paper from the toner removing device to the cutting machine in advance, and cut it by the cutting machine without accommodating it in the fifth paper discharge tray.

In the above embodiment, the transfer paper surface after the toner removal processing separated from the paper holding drum 601 is detected by the CCD 603b and the data from this is used to judge the presence or absence of the imprint. The data from the CCD 603a for detecting the transfer paper surface on the holding drum 601 is used to detect the presence / absence of a seal image, and the data on the transfer paper surface before the toner removal processing is used to detect the image on the surface. It may be determined whether or not the seal imprint is included.

[0085]

According to the first, fourth and sixth aspects of the present invention, all or part of the seal imprint is made unrecognizable to completely prevent misuse of the image holding sheet on which the seal imprint remains, or to leave the seal imprint. It is easy to recognize that the image-holding sheet that has been subjected to the image-forming substance removal processing is made difficult to misuse this image-holding sheet. You can When the imprint remains on one surface, the image-holding sheet is stored without removing the image-forming substance on the other surface of the image-holding sheet, and the other surface is not removed. Since the useless image forming substance removing process is not performed, the image forming substance removing process for reusing the image holding sheet can be efficiently performed. Particularly, according to the invention of claim 6, it can be automatically performed by the apparatus.

According to the second and fifth aspects of the present invention, the unrecognizable image holding sheet cannot be completely removed after the image forming substance attached to the surface of the image holding sheet is removed. The image-bearing sheet in which the image forming material remains only on one side and the image-bearing sheet remaining on both sides are stored separately. The management of prevention can be further facilitated. Particularly, according to the invention of claim 5, it can be automatically performed by the apparatus.

Further, according to the inventions of claims 3 and 7, the image forming substance which is stably attached to the image holding sheet whose surface is made of fibrous material and the state of attachment to the surface are unstable. In this state, the peeling member is brought into contact with the image forming substance in the unstable state, and the image forming substance is peeled off from the surface. Therefore, damage to the fibrous surface of the image holding sheet due to the removal of the image forming substance is prevented. Can be reduced. Therefore, the number of times the image holding sheet is reused can be increased, and the resources can be effectively utilized.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a toner removing device according to an embodiment.

FIG. 2A is a front view of a punching unit used in the toner removing device. (B) is a perspective view of the punching unit.

FIG. 3 is a perspective view of a printing unit used in the toner removing device.

FIG. 4 is a perspective view of a printing unit according to a modified example.

FIG. 5 is a block diagram of an electric part of the toner removing device.

FIG. 6 is a flowchart of control of the toner removing device.

FIG. 7 is a flowchart of the same control according to a modification.

[Explanation of symbols]

 1 Paper Feeding Unit 4 Drying Unit 5 Paper Receiving Unit 6 Liquid Applying Unit and Toner Peeling Unit 30 Identification Mark Applying Unit 40 Sorting Unit 42 Deflection Claw

Claims (7)

[Claims] 1. A method of removing an image-forming substance from both sides of an image-holding sheet, wherein after the image-forming substance adhering to the surface of the image-holding sheet is removed, the image-forming substance present on the image-holding sheet produces a seal image. When configured, storing the image-holding sheet without making all or part of the imprint unrecognizable, and without removing the image-forming substance from the other surface of the image-holding sheet. A method for removing an image-forming substance from both sides of an image-holding sheet. 2. The unrecognizable image-holding sheet, after the image-forming substance adhering to the surface of the image-holding sheet is removed, the image-forming substance which cannot be completely removed remains on only one surface. The method for removing an image forming substance from both sides of an image holding sheet according to claim 1, wherein the image holding sheet and the image holding sheet remaining on both sides are stored separately. 3. An image in which the image-forming substance stably adhered to an image-bearing sheet having a fibrous surface and the surface are destabilized to make the image unstable. The method for removing an image-forming substance from both sides of an image-holding sheet according to claim 1 or 2, wherein a peeling member is brought into contact with the forming substance, and the image-forming substance is peeled and removed from the surface. 4. A sheet processing means for making unrecognizable all or a part of an imprint made of an image forming substance existing on an image holding sheet, and before the image forming substance removing process is performed by the image forming substance removing means. It is detected in advance whether or not there is an image forming substance that forms a seal imprint that cannot be completely removed by the process, or a seal imprint that cannot be completely removed by the process is performed after the image forming substance removal process is performed. Sheet surface detecting means for detecting whether or not an image forming substance is present on both sides of the image holding sheet, and control of operation / non-operation of the sheet processing means based on the detection result of the sheet surface detecting means. And sheet processing control means for performing, when the sheet surface detecting means detects the presence of an image forming substance forming a seal image on the surface of the image holding sheet relating to the preceding image forming substance removal processing, Image forming substance removing apparatus from the image holding sheet duplex characterized in that a a removal processing prohibition control means for prohibiting said image forming substance removal processing for the other surface of the image holding sheet. 5. An image holding sheet or an image holding material removing means in which the image forming material which could not be completely removed remains after the image forming material removing processing is performed by the image forming material removing means. After the image forming substance removing process is performed, the image holding sheet processed by the sheet processing unit is stored separately from the storage unit that stores the image holding sheet in which the image forming substance that cannot be completely removed remains on both sides. 5. An apparatus for removing an image forming substance from both sides of an image holding sheet according to claim 4, further comprising a storage means. 6. The image holding sheet according to claim 4, wherein the sheet processing means is configured to attach an image forming substance having substantially the same color as that of the image holding sheet to all or a part of the imprint. Image forming substance removing device. 7. The image-forming substance removing means as set forth above, wherein an image-forming substance stably attached to an image-holding sheet having a fibrous surface, and an adhesion state of the surface are made unstable. 7. The destabilizing means for adhering, and the peeling means for peeling and removing the image forming substance from the surface by bringing a peeling member into contact with the image forming substance in an unstable state. Apparatus for removing image-forming substances from both sides of 4, 5 or 6 image-holding sheet.