JPH0756477A - Method and apparatus for removing an image-forming substance from an image carrier for applying a penetration enhancer to an image area - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the consumption of processing liquid, shorten the processing time in the drying process and save power, and prevent wrinkles and waviness from occurring on the transfer paper. [Structure] A liquid applying device that applies the penetration promoting liquid 21 to the transfer paper 10 includes a jet nozzle head 223, an image detection sensor 245, a control unit 9, a paper leading edge sensor 234, and the like. When the operator selects the partial erase mode, the image on the transfer paper 10 is read by the image detection sensor 245, and a part or all of the image data is temporarily stored in the control unit 9. After a lapse of a predetermined time from the time when the leading edge of the transfer sheet is detected by the sheet leading edge sensor 234, the process of applying the penetration degree promoting liquid 21 to the transfer sheet 10 by the jet nozzle head 223 is started. Here, the liquid ejection from the jet nozzle head 223 is controlled based on the image data. Penetration promoting liquid 2
After applying 1, the treatment liquid 20 is applied only to the image area of the transfer paper 10 or to the entire surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image carrier for removing an image forming substance from the surface of the image carrier to which the image forming substance is stably attached by an image forming apparatus such as a copying machine, a facsimile machine, a printer and a printing machine. The present invention relates to a method and an apparatus for removing an image forming substance from an image.

[0002]

2. Description of the Related Art Conventionally, there are known various image forming substance removing methods and devices for removing an image forming substance such as toner from a sheet as a recorded image carrier. 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, when the above-mentioned solvent-free method and apparatus are used to remove an image-forming substance from a recorded image carrier on which an image is recorded on an ordinary paper having paper fibers exposed on the surface, for example, Since the image-forming substance is firmly fixed to the fibers on the surface of the image-holding member by fusing the image-forming substance containing a heat-meltable resin as a main component to the image-holding member in the fixing step of the electrophotographic method, 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.
In particular, in order to improve the removability of the image-forming substance, when heat or pressure is applied to the above-mentioned ink peeling body, endless sheet or roller, depending on various conditions, the space between the image-forming substance and the image carrier may be reversed. In some cases, the fixability of the above is increased, which makes removal difficult.

Therefore, the present applicant has previously proposed that the recorded image carrier has water as a destabilizing solution, 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 carrier. An image forming substance removing method has been proposed (for example, Japanese Patent Application No. 4-255).
916). According to this, only the image-forming substance can be removed without relatively damaging the paper quality of the image carrier.

[0006]

However, in the above-mentioned conventional structure, the processing liquid is applied to the entire surface of the image carrier even if the image carrier is partially formed with an image. In some cases, the processing liquid was uselessly consumed.
Further, when the treatment liquid is excessively applied to the image carrier, the amount of heat required in the subsequent drying step increases, the processing time in the drying step becomes longer, and the power consumption may increase. In addition, when the treatment liquid is excessively applied to the image carrier, wrinkles, waviness and the like of the image carrier may easily occur.

The present invention has been made in view of the above problems, and an object of the present invention is to promote permeation of a destabilizing agent in an image area of an image carrier to which an image forming substance is attached. This reduces the consumption of the destabilizing agent, shortens the processing time in the drying process, saves power, and prevents wrinkles and waviness of the image carrier. And a device therefor.

[0008]

In order to achieve the above object, the invention of claim 1 is an image carrier for removing an image forming substance from an image carrier having an image forming substance stably attached to the surface thereof. A method of removing an image forming substance from the step of detecting an image area on the image holding body to which the image forming substance is attached,
A penetration enhancer that promotes permeation of a destabilizing agent that makes the state of adhesion between the surface and the image-forming substance unstable to the image carrier is applied to the image area of the image carrier. And a step of applying the destabilizing agent to the image carrier to which the penetration enhancer has been applied.

According to a second aspect of the invention, there is provided an apparatus for removing an image-forming substance from an image-holding member, which removes the image-forming substance from the image-holding member having the image-forming substance stably attached to the surface thereof.
An image area detecting means for detecting an image area on the image carrier on which the image forming substance is attached, and a destabilizing agent for making an attachment state between the surface and the image forming substance unstable. Penetration promoting agent applying means for applying a penetration promoting agent for promoting penetration into the image carrier to the image supporting body, and the destabilizing agent for the image carrying body provided with the penetration promoting agent. Based on the detection result of the destabilizing agent imparting means and the image area sensing means,
A control means for controlling application of the penetration enhancer by the penetration enhancer applying means is provided.

In the invention of claim 1 or 2, the penetration enhancer and the destabilizing agent include not only liquid but also powder and gel.

[0011]

According to the first aspect of the invention, the image area on the image carrier on which the image-forming substance is attached is detected, and the penetration enhancer is applied only to the image area of the image carrier. It becomes possible to accelerate the penetration of the destabilizing agent into the image area. Then, the destabilizing agent is applied to the image carrier to which the penetration enhancer is applied, so that the adhesion state between the surface of the image region and the image forming substance is surely made unstable. You will be able to.

According to a second aspect of the present invention, the image area detection means detects the image area on the image carrier to which the image forming substance is attached, and the control means detects the detection result of the image area detection means. Based on the above, it is possible to accelerate the penetration of the destabilizing agent into the image region by controlling the application of the penetration promoting agent by the penetration promoting agent applying means. Then, the destabilizing agent imparting means imparts the destabilizing agent to the image carrier to which the penetration enhancer has been imparted, whereby the gap between the surface of the image region and the image forming substance is imparted. The adhered state can be reliably made unstable.

[0013]

EXAMPLES The present invention is an image carrier for removing a heat-melting toner (hereinafter referred to as 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 embodiment applied to the image forming substance removing device (hereinafter referred to as a toner removing device) will be described. FIG. 1 shows a schematic configuration diagram of an example of a toner removing device to which the present invention can be applied. First, to explain the overall outline,
This toner removing device includes a paper feed unit 1 for separating and feeding the transfer papers 10 on which toner images are formed, which are accommodated in a stacked state, and a liquid feeding device for transferring the transfer papers 10 fed from the paper feed unit 1. A liquid applying unit 2 for supplying the liquid, a toner peeling unit 3 for removing the toner from the transfer paper 10 to which the liquid is supplied, a drying unit 4 for drying the transfer paper 10 from which the toner is removed, and a discharge unit 4. Transfer paper 1
And a paper receiving unit 5 for receiving 0. And
The transfer paper 10 conveyed from the paper feeding unit 1 is provided with a destabilizing agent (hereinafter, referred to as a processing liquid) 20 that makes the adhesion state of the transfer paper 10 and the toner in an unstable state in the liquid applying unit 2, The liquid 20 is allowed to permeate at least the interface between the transfer paper 10 and the toner. Then, after the peeling roller 302 of the toner peeling unit 3 peels the toner from the transfer paper 10 at the interface where the treatment liquid 20 has permeated, the transfer paper 10 is dried by the drying roller 402 of the drying unit 4 to receive the paper. It is discharged to the unit 5.

Here, as the treatment liquid 20, water, an aqueous solution containing a water-soluble polymer, an aqueous solution containing a surfactant,
At least one kind of water or an aqueous solution selected from the group consisting of an aqueous solution containing a water-soluble polymer and a surfactant can be used. Further, the water or the aqueous solution may contain a predetermined organic solvent. Moreover, as the processing liquid 20, only an organic solvent can be used.

Examples of the water-soluble polymer include starchy substances (branch starch, potato starch, tapioca starch, wheat starch, corn starch, etc.),
Mannan (konjac, etc.), seaweed (Funori, agar, sodium alginate, etc.), plant mucilage (troloois,
Gum tragacanth, gum arabic, etc.), mucilage by microorganisms (dextran, levan, etc.), protein (glue,
Gelatin, casein, collagen, etc.) natural polymers, cellulose-based (viscose, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, etc.), starch-based (soluble starch, carboxymethyl starch, dialdehyde starch) semi-synthetic polymers, Examples thereof include synthetic polymers, but are not limited thereto.

Further, as the above-mentioned surfactant, for example,
Anionic (carboxylate, sulfonate, sulfate ester, phosphate ester, phosphonate, etc.), cationic (amine salt, quaternary ammonium salt, benzalkonium salt, benzethonium chloride salt, pyridinium) Salt, imidazolinium salt, sulfonium salt, polyethylene polyamine, etc.), amphoteric system (amino acid, carboxybetaine, sulfobetaine, aminosulfate, aminocarboxylic acid salt, imidazoline derivative, etc.), nonionic (ether type, ether ester type) , Ester type, nitrogen-containing type, polyhydric alcohol, amino alcohol, polyethylene glycol, etc.) and fluorine-based surfactants, but not limited thereto.

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, methyl cellosolve acetate, benzene, methyl ethyl ketone, Examples thereof include, but are not limited to, methyl acetate, methylene chloride, ethylene dichloride, cyclohexane, cellosolve, dioxane, acetone, methyl cellosolve, cyclohexanol, butanol and the like.

As the organic solvent used alone, carbon-hydrogen solvent such as hexane, heptane, octane, nonane, spirit, naphtha N01-6 (trade name of Shell Petroleum Co.), Isopar E, L, K, V (trade name of Exxon), IP Solvent (trade name of Idemitsu Oil Co., Ltd.), Shell-sol 70, 71, Solvesso 100,
150 (trade name of Shell Oil), Ascom OMS,
460 (trade name of Spirits), Vegasol 103
0,2130,3040 (trade name of Mobil Oil Co., Ltd.) and the like. Further, Fluorinert FC40, 43, 70, 77 (trade name of Sumitomo 3M), which is a fluorine-based solvent,
Aflude E10, 16, 18, etc., Shin-Etsu Silicone KF96 (trade name) which is a silicone solvent, Toray Silicone SH200, 344 (trade name), Toshiba Silicone T
SF431 (trade name) and the like are included, but the invention is not limited thereto.

Next, the respective units 1, 2, 3 of the illustrated example
4, 5 will be described. The sheet feeding unit 1 feeds the transfer sheets 10 stacked on the bottom plate 101 from the lowermost one by a sheet feeding roller 102, separates the double feed by a separation mechanism (not shown), and forms one sheet of the transfer sheet 10. Only the registration roller pair 104 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 application unit 2 is in contact with the liquid container 201 filled with a predetermined amount of the processing liquid 20 and one surface (the upper surface in the drawing) of the transfer paper 10 and the processing liquid 20 in the liquid container 201.
The submerged conveying roller 202 that conveys the medium to guide the inside, the driving unit (not shown) of the submerged conveying roller 202, and the other surface (the lower surface in the drawing) of the transfer paper 10 into the processing liquid 20 of the liquid container 201. A submerged guide plate 203 for guiding, a pair of squeezing rollers 204 also functioning as a holding and conveying means, a squeezing rod 205 that is arranged to bite into the lower squeezing roller 204, and the like are provided.
In this unit 2, the transfer paper 10 fed from the paper feeding unit 1 is guided into the treatment liquid 20 in the liquid container 201 by the submerged conveying roller 202 and the submerged guide plate 203, and immersed in the treatment liquid 20. After being squeezed, the squeezing roller pair 204
The excess processing liquid 20 is removed by the above and is conveyed to the next toner peeling unit 3. A specific example of the liquid applying unit 2 according to the present invention will be described in detail later.

The toner peeling unit 3 includes a pair of peeling rollers 302 each having a built-in heating lamp 301 as a means for softening the toner T and arranged in pressure contact with each other, and a peeling roller 302 near the pressure contact portion on the transfer paper discharge side. Separation claw 303 and peeling roller 30 arranged so as to contact the surface
A cleaning device 304 for cleaning the surface of 2.
A drive unit (not shown) and the like are provided.

The surface of the peeling roller 302 is made of a material having an adhesive force greater than that of the transfer paper 10 and the toner to at least the softened toner. Specifically, the same or similar toner component resin as the above toner, component resin of an adhesive, or the like can be used,
In addition, aluminum-based, copper-based, nickel-based, and other metal materials can be used, but are not limited thereto. The resin may be water-soluble or water-insoluble. (Hereafter, margin)

Examples of the toner component resin include polystyrene resin, acrylic resin, methacrylic resin, styrene-butyl acrylic copolymer, styrene-butadiene copolymer, polyester resin, and epoxy resin, but are not limited thereto. Not a thing.

As the component resin of the adhesive, protein adhesives such as glue, gelatin, albumin and casein, and carbohydrate-based adhesives such as starch-based, cellulose-based, complex polysaccharide-based (arabic gum, tragacanth gum, etc.) Agents, vinyl acetate polymers and copolymers, acrylics,
Thermoplastic adhesive such as ethylene copolymer, polyamide, polyester, polyurethane, rubber adhesive such as polychloroprene-based, nitrile rubber-based, recycled rubber-based, SBR-based, natural rubber-based, rubber-based, acrylic-based, etc. Polyethylene terephthalate (PE) with pressure-sensitive adhesive and titanium oxide dispersed
T), etc., but not limited thereto.

Further, when the above 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 viewpoints of preventing elongation due to tension and heat and durability. That is, when a roller-shaped peeling member is used as in the illustrated example, it is desirable to form a peeling member by forming a surface layer made of the above resin or the like on a base roller as a support.

As a support for supporting the above resin, etc.,
For example, rubber rollers, sheets, cellophane tapes, kraft paper adhesive tapes, polyvinyl chloride tapes, acetone tapes, tapes such as filament reinforcing tapes, and the like can be used, but are not limited thereto.

The heating lamp 301 of the upper and lower peeling rollers 302 is in close contact with the front and back of the transfer paper 10 to heat and soften the toner adhered to the transfer paper 10.
The toner is easily separated from the fibers of the transfer paper 10. It is desirable to perform this heating to such an extent that the toner on the transfer paper 10 does not melt at the pressure contact portion. This is because if the toner melts, it will be difficult to transfer the toner on the transfer paper 10 to the peeling roller 302 side without dividing the toner between the paper side and the peeling roller 302 side. If it is heated too much, the transfer paper 1 is transferred while passing through the pressure contact portion of the pair of peeling rollers 302.
0 is too dry, and the fixing force of the toner to the transfer paper 10 is stronger than that when the transfer paper 10 is wet, and the transfer paper 10 is attached to the roller 302 through the toner and is separated by the separation claw 303. There is a risk that they will not be separated. Therefore,
It is desirable to heat the transfer paper 10 after passing through the heating unit to such an extent that a little damp air remains and the re-adhesion of the toner can be prevented.

The cleaning device 304 removes the toner T on the surface of the peeling roller 302, the scraper blade 306 for scraping off the toner T on the cleaning roller 305, and the toner T scraped off by the scraper blade 306. A toner receiver (toner container) 307 for containing the toner is provided.

A belt having the same surface characteristics as the peeling roller 302 may be used instead of the peeling roller 302, or the cleaning roller 305 of the cleaning device 304 may be replaced with a cleaning blade or a scraper that directly contacts the surface of the peeling roller 302. You may use such as.

The drying unit 4 is for drying the transfer paper 10 and is composed of an upper drying roller 402 made of, for example, aluminum and having a built-in heating lamp 401, and a lower drying roller 404 pressed against the upper drying roller 402. . The lower drying roller 404 is provided with a surface layer made of a liquid-supplying member, and a diaphragm blade 405 for squeezing the liquid on the surface layer is in contact therewith. Instead of or in addition to the pair of drying rollers 404, 404, a belt-shaped member may be used, or a hot air fan or an infrared lamp may be used.

The paper receiving unit 5 is provided with a paper discharge tray 501 for receiving the transfer paper discharged from the drying unit 4.

Although not shown in the figure, the toner removing device includes a detecting means for detecting whether or not the transfer paper 10 is present on the paper feeding table, a double feeding detecting means for the transfer paper 10 by the paper feeding unit 1, Liquid remaining amount detecting means in liquid container 201, liquid container 201
Means for automatically replenishing liquid to the transfer paper, means for detecting jam of the transfer paper 10 inside the apparatus, means for controlling lighting of each heating lamp, and toner receiving container 3
A means for filling the inside of 07 is provided.

In the above-described structure, the transfer paper 10 sent from the paper feeding unit 1 is uniformly supplied with the liquid on the toner image surface by the liquid applying unit 2, and is sent to the toner peeling unit 3. In the toner peeling unit 3, the toner adhered to the paper is softened by heating from the peeling roller 302 and adheres to the surface of the peeling roller 302. The paper from which the toner has been removed is dried by the drying unit 4 and discharged to the paper receiving unit 5.

As described above, according to this toner removing device, since the liquid is supplied to the paper on which the toner is attached and the liquid is permeated into the interface between the paper and the toner, the toner is peeled off, so that the paper fiber is damaged. Without, the toner can be removed.

Further, the surface of the peeling roller 302 is contacted with the peeling roller 302 while the surface of the paper is wet and heated to such an extent that the paper can be kept wet even when the paper is separated from the peeling roller 302. Even when it is made of an adhesive material, the paper surface itself has the peeling roller 302.
It is possible to prevent the separation failure due to the adhesion to the surface, and to prevent the retransfer of the toner due to the separated paper portion coming into contact with the peeling roller 302 again.

In this toner removing device, the transfer paper 10 is held by the two peeling rollers 302 to remove the toner from both sides of the transfer paper 10. Therefore, the toner is removed from the bottom plate 101 of the paper feeding unit 1. It is not necessary to consider the front and back sides when setting the transfer paper 10 to be removed. Further, when it is desired to remove the toner on both sides of the transfer paper used on both sides, it is only necessary to pass the inside of the apparatus once.

Next, the control section 9 for operating the toner removing device will be described with reference to FIG. Figure 2
FIG. 3 is a control block diagram for operating the toner removing device of FIG. 1. When AC power is supplied from the commercial power supply 901 and the main switch 902 is turned on, the DC power supply (PS
U) 903 supplies a DC power supply voltage to each control IC. The CPU 904 supplied with power resets the program counter and the like, and starts control based on the program content written in the ROM 905. The CLK oscillator 906 is a reference clock (CL
K) is supplied.

First, data for turning on the relay 909 is sent to the parallel interface 908 through the address data bus 907. A driver 910 for driving each load is provided at the output port of the parallel interface.
Are connected, and the contact drive coil of the relay 1 is connected to a part of them, and the contact 911 of the relay 1 is closed.

Then, SSR1 (912) and SSR2
Data is sent to the driver 910 in the same manner as described above so that each of (913) turns on. Two or one resistors 914a and 914b corresponding to the heating lamp 301 that heats the peeling roller 302 are connected to the tip of the SSR1, and heating of the roller 302 is started. On the other hand, a resistor 915 corresponding to the heating lamp 401 that heats the drying roller 402 is connected to the tip of the SSR2, and heating is similarly started. The temperature of each roller is detected by the thermistors 916 and 917, input to the A / D converter 918, and converted from analog data to digital data. RAM919
The control temperature of each roller is written in, and the temperature is controlled by comparing with that value. This data is sent from the operation display unit 920 through the serial interface 921,
It can also be written in the RAM 919.

When the temperature of each roller reaches a temperature (setting value of RAM) sufficient for peeling or drying, an operable display (LED lighting, etc.) is displayed on the operation display unit 920.
When the operation command data is transmitted from the operation display unit 920, the CPU 904 operates the main driving motor 922, and when the load of the motor can be driven at a constant speed, the paper feeding motor 923 is driven to start the paper feeding. Here, the registration motor 924 rotates while timing with the paper feed motor to prevent skew and feeds the paper. After that, the steps of impregnation, peeling and drying of the treatment liquid described above are performed.

All the loads other than the paper feed roller 102 and the registration roller 104 are synchronously driven by the main drive motor 922. The LCT has a paper end sensor 925 for detecting the presence / absence of paper, and when the paper runs out, the paper-out data is transmitted through the parallel interface. The CPU 904, which has detected that there is no paper, stops the machine operation and displays the operation stop (LED lighting etc.) on the operation display unit 920.

Next, a specific structural example of the liquid applying unit 2 according to the present invention will be described in detail. FIG. 3 is a schematic configuration diagram of the liquid applying unit 2 according to the present embodiment. The liquid applying unit 2 transfers a penetration promoting liquid 21 as a penetration promoting agent for promoting the permeation of the processing liquid 20 into the interface between the transfer paper 10 and the toner by a transfer roller pair 209 or the like. 10, and a treatment liquid as a destabilizing agent imparting means for imparting the treatment liquid 20 to the transfer paper 10 to which the permeability enhancing liquid 21 has been imparted. It is configured by the applying device 2b.

Here, as the penetration promoting liquid 21,
For example, the above surfactants and the like can be used. Also,
Penetration promoting liquid application device 2a and treatment liquid application device 2b
For each of them, a liquid applying device having a configuration described later can be used. Further, in each of the penetration promoting liquid application device 2a and the treatment liquid applying device 2b, a plurality of the applicator devices are used to apply the penetration promoting liquid 21 or the treatment liquid 20 to the transfer paper 10 many times. You may comprise.

A more specific structural example of the liquid application device used as the penetration promoting liquid application device 2a will be described below.
FIG. 4 is a schematic configuration diagram of the liquid application device according to the present embodiment, and FIG. 5 is a schematic configuration diagram of the liquid application device using the jet nozzle head 223. This liquid applying device includes a jet nozzle head 223 provided with a plurality of jet nozzles orthogonal to the traveling direction of the transfer paper 10 and a conveying roller pair 20.
9a, b and the like. Further, the image detection sensor 24 serves as an image area detection unit that detects an image area on the transfer paper 10.
It is equipped with 5. At a position facing the detection surface of the image detection sensor 245, a facing roller 225 for sandwiching and conveying the transfer paper 10 between the sensor 245 and the sensor 245 is arranged. Also,
As the control means for controlling the process of applying the penetration promoting liquid 21 to the transfer paper 10 based on the detection result of the image detection sensor 245, the leading end of the transfer paper 10 conveyed to the controller 9 and the liquid applying device is detected. The paper leading edge sensor 234 is provided.

As the image detecting sensor 245, CC
An image sensor such as a D line sensor can be used. In this case, the CCD line sensor needs to have a length substantially equal to or larger than the width of the transfer paper 10. Further, the CCD line sensor can be downsized by using the reduction optical system. However, the resolution does not change.

As the paper edge sensor 234, a reflection type, a transmission type, a photosensor with a filler, or the like can be used.

In the liquid applying device, when the operator selects the partial erasing mode by the operation section (not shown), first, the transfer paper 10 fed from the paper feeding unit 1 is conveyed by the counter roller 225 while the image is formed. The image is read by the detection sensor 245. Part or all of the image data is temporarily stored in the RAM 919 via the A / D converter 918 in FIG. Then, the leading edge of the transfer sheet 10 is detected by the sheet leading edge sensor 234, and after a predetermined time has elapsed from the time of this detection, the jet nozzle head 22
The process of applying the penetration promoting liquid 21 to the transfer paper 10 by 3 is started. The transfer paper 10 is used for the predetermined time.
And the distance between the paper tip sensor 234 and the liquid ejection position of the jet nozzle head 223. Further, after the leading edge of the transfer sheet 10 is detected by the sheet leading edge sensor 234, the driving of the conveying roller pair 209a is temporarily stopped, the leading edges of the transfer sheet 10 are aligned, and the transfer sheet 10 is jetted by a restart signal from the control unit 9. Nozzle head 223
It is also possible to carry out control so that the timing of starting the liquid application process and the timing at which the front end of the transfer paper 10 faces the jet nozzle head 223 are accurately synchronized by transporting the liquid to the side.

In the liquid application operation to the transfer paper 10, the liquid ejection from each nozzle of the jet nozzle head 223 is controlled based on the image data stored in the RAM 919 of the control unit 9. For example, as shown in FIG. 5, the liquid ejection is controlled to be performed only from the jet nozzles facing the image 10a of the transfer paper 10. Here, it is not necessary to set the position accuracy of reading / jetting in the image area very finely, as long as the penetration promoting liquid 21 can be applied to an area larger than the image. For example, in ink jet printing used in printers and the like, an accuracy of 200 to 400 dots per inch is generally used, but in the present embodiment, a division accuracy of several mm to several cm is sufficient. However, it is of course possible to control the reading / injection position with high accuracy.

As the liquid applying device for applying the treatment liquid 20 to the transfer paper 10 after applying the penetration promoting liquid 21, the treatment liquid 20 is applied only to the image area like the liquid applying devices of FIGS. 4 and 5. A liquid applying device for applying the treatment liquid 20 may be used, but a normal liquid applying treatment for applying the treatment liquid 20 to the entire surface of the transfer paper 10 may be used.

On the other hand, when the operator does not select the partial erasing mode by the operation unit, the normal liquid application process, that is, the process step of applying the penetration promoting liquid 21 to the entire surface of the transfer paper 10 is executed.

As described above, according to the present embodiment, the image detection sensor 245 detects the image area on the transfer paper 10 on which the toner adheres, and the controller 9 controls only the image area to permeation promoting liquid. 21 is added to the processing liquid applying device 2b.
Thus, the treatment liquid 20 is applied to the transfer paper 10 to which the penetration promoting liquid 21 has been applied. As a result, the adhesion state between the surface of the image area and the toner can be reliably made unstable, so that the toner can be reliably removed from the image area in the next peeling step. Further, since the treatment liquid 20 can be applied only to the image region, the consumption amount of the penetration enhancer liquid 21 and the treatment liquid 20 can be reduced, and the processing time and the power saving in the subsequent drying process can be shortened. You will be able to plan. Further, since the liquid component such as water applied to the transfer paper 10 can be reduced,
It is possible to suppress the occurrence of wrinkles, waviness and the like of the transfer paper 10.

In the above embodiment, the jet nozzle head 223 is used in the penetration promoting liquid application device 2a, but instead of this, a pair of liquid application rollers that can change the applied pressure and a spray that can change the liquid spray amount. A nozzle or the like may be used. Further, the processing head has a groove for holding the liquid in a direction orthogonal to the transfer direction of the transfer paper 10, and the liquid in the groove can be selectively applied to the transfer paper 10 transferred so as to be in contact with the groove. Etc. may be used.

Further, in the above embodiment, the area to which the penetration promoting liquid 21 is applied may be the entire surface of the image area detected by the image detecting sensor 245, but the penetration promoting liquid 21 is applied only to a part of the image area. May be controlled to be given.

Further, in the above-described embodiment, since the leading end of the transferred transfer paper 10 is usually blank, the penetration promoting liquid 21 is not applied to the leading end and is not wet with the treatment liquid 20. . If the tip is not blank,
It may be controlled so that the penetration promoting liquid 21 is not applied to the tip portion or the penetration promoting liquid 21 and the treatment liquid 20 are not applied. By suppressing the wetting of the leading end portion of the transfer paper 10 in this manner, the transfer paper 10 can be easily separated from the processing member in the post-treatment process such as the peeling process.

In the above embodiment, the transfer paper 10 on which an image is formed by the transfer type electrophotographic copying machine according to the present invention,
Alternatively, although it is applied to the unused transfer paper 10 before an image is formed, it can also be applied to an image carrier such as a recording paper used in other image forming apparatus such as a paper such as a facsimile, a printer and a printing machine. 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.

[0056]

According to the first and second aspects of the present invention, the image area on the image carrier to which the image-forming substance is attached is detected, and the penetration enhancer is applied only to the image area. The destabilizing agent is applied to the image carrier to which the penetration enhancer is applied. As a result, the adhesion state between the surface of the image area and the image-forming substance can be reliably made unstable, so that the image-forming substance can be reliably removed from the image area in the next peeling step. The effect is that Further, since the destabilizing agent can be added only to the image area, the consumption amount of the penetration enhancer and the destabilizing agent can be reduced, and the processing time in the subsequent drying step can be shortened. There is an effect that power saving can be achieved. Further, since a liquid component such as water applied to the image carrier is small, it is possible to suppress the occurrence of wrinkles, waviness and the like of the image carrier.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a control unit of the toner removing device.

FIG. 3 is a schematic configuration diagram of a liquid applying unit of the toner removing device.

FIG. 4 is a schematic configuration diagram of a liquid applying device of the liquid applying unit.

FIG. 5 is a schematic configuration diagram of the same liquid applying device using a jet nozzle head.

[Explanation of Codes] 2 Liquid Applying Unit 9 Control Section 10 Transfer Paper 209a, b Conveying Roller Pair 223 Jet Nozzle Head 225 Opposing Roller 234 Paper Edge Sensor 245 Image Detection Sensor

Front page continued (72) Inventor Ryo Shingu Kei 3-6 Nakamagome, Ota-ku, Tokyo Stock company Ricoh (72) Shinichi Kuramoto 1-3-6 Nakamagome, Ota-ku, Tokyo Stock company In Ricoh (72) Inventor Sadao Takahashi 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Yoshiyuki Kimura 1-3-3 Nakamagome, Ota-ku, Tokyo In-Ricoh Company (72) ) Inventor Kazuhiro Ando 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Tadashi Saito 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (2)

[Claims] 1. A method for removing an image-forming substance from an image-holding member, which removes the image-forming substance from an image-holding member having an image-forming substance stably attached to the surface thereof. A step of detecting an image area in which an image is attached, and promoting penetration of a destabilizing agent that makes the adhesion state between the surface and the image forming substance unstable to the image carrier. An image carrier comprising a step of applying an agent to an image area of the image carrier, and a step of applying the destabilizing agent to the image carrier to which the penetration enhancer has been applied. Of removing image-forming substances from the. 2. An image-forming substance removing apparatus for removing an image-forming substance from an image-bearing member having an image-forming substance stably attached to a surface thereof, comprising: Image area detection means for detecting an image area in which an image is adhered, and promoting penetration of a destabilizing agent that makes the adhesion state between the surface and the image forming material into an unstable state into the image carrier. Penetration promoting agent applying means for applying a penetration promoting agent to the image carrier, and destabilizing agent applying means for applying the destabilizing agent to the image carrier to which the penetration promoting agent is applied. An image forming material from the image carrier, the control means controlling the application of the penetration promoting agent by the penetration promoting agent applying means based on the detection result of the image area detecting means. Removal device.