JPH07237775A - Device for removing image forming substance from recording sheet and sheet processing device - Google Patents

Abstract

PURPOSE:To control switchingly the speed of each transfer roller pair by preventing the cut, creases, elongation, etc., of transfer paper during the transfer in a device for removing toners by supplying a liquid on the transfer paper. CONSTITUTION:The transfer speed of a pair of transfer rollers 2 on the downstream side among the transfer roller pairs 1 and 2 as the nipping transfer means which are continuous each other in the transfer direction of transfer paper 10 is switched to the low speed before the top end of the copying paper sheet is nipped, and the transfer paper 10 is transferred for a prescribed time in the state where the speed of a pair of transfer rollers 1 upstream become high. Accordingly, a deflection is formed on the transfer paper 10. After the lapse of a prescribed time, the original speed is restored, and the superposed bending due to the excessive increase of the deflection can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records by an image forming apparatus such as a copying machine, a facsimile machine, a printer, a printing machine, etc., in order to remove the image forming material from a recording sheet on which the image forming material has been adhered. The present invention relates to an image forming substance removing device for performing a liquid application process on a recording sheet and a sheet processing device for performing a liquid application process on at least the sheet.

[0002]

2. Description of the Related Art Heretofore, various methods and apparatuses have been known for reproducing a recording sheet by removing an image forming substance such as toner from a recording recording sheet. For example, Japanese Patent Application Laid-Open No. 1-
Japanese Patent Laid-Open No. 101576 discloses a method of removing an image-forming substance in which a sheet having a toner attached thereto is dipped in a soluble solvent of a toner resin and ultrasonic vibration is applied to release the toner dissolved in the solvent from the surface of the sheet. . In addition, JP-A-4-30
No. 0395 discloses that a solvent is attached to a printed portion of waste paper by a method such as dipping, spraying or coating to dissolve the toner, and the dissolved toner is washed, air suction, contact with an adsorbent,
An image forming substance removing method is disclosed in which the image forming substance is removed by a method such as mechanical peeling or electrostatic adsorption.

Further, the applicant of the present invention previously applied to a recorded recording sheet, 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 recording 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 recording sheet.

Further, the applicant of the present invention is in the above-mentioned Japanese Patent Application No. 4-2559.
In an apparatus for carrying out the method for removing an image-forming substance proposed in No. 16, in order to dry a recording sheet wet with a liquid after the image-forming substance is removed, a sandwiching and conveying means for conveying the sheet while sandwiching the sheet while drying. In the case of providing a wrinkle in the carrying direction or cutting the sheet, the carrying speed of the sandwiching carrying means is set to the upstream side in the carrying direction in order to eliminate this problem. It has been proposed to set it to a speed lower than the carrying speed of the holding and carrying means arranged on the side (Japanese Patent Application No. 5-201176).

[0005]

However, in the subsequent research, the problems such as the wrinkles in the transport direction and the breakage of the recording sheet during the transportation of the apparatus are not limited to during the transportation for drying but also for the recording in the wet state. It was confirmed that it also occurs in the holding and conveying means at other places where the sheet for conveyance is conveyed. It was also confirmed that if the wet recording sheet is conveyed while being stressed in the conveying direction, the recording sheet may be elongated in the conveying direction.

Then, in order to prevent the above-mentioned wrinkles, breaks, and elongation from occurring in the holding and conveying means other than the drying, they are arranged at intervals in the conveying direction as in the case of the above-mentioned Japanese Patent Laid-Open No. 5-201176. It was also confirmed that wrinkling may occur due to partial folding of the recording sheet when the conveyance speed of the holding conveyance means on the downstream side in the conveyance direction is set to a relatively low speed among the pair of holding conveyance means. It was For example, as shown in FIGS. 6A to 6C, when the conveying speed of the conveying roller pair 1 and the conveying roller pair 2 on the downstream side in the conveying direction is set to be lower in the latter case. It has been found that the slack caused by the difference in transport speed becomes too large and the slack portions are buckled and overlapped and folded, and then pass through the nip of the transport roller pair 2 on the downstream side as it is to cause wrinkles in the folding.

Such a problem that the wet sheet is cut, wrinkled and stretched during the transportation in the apparatus is caused by the image forming substance removing apparatus using the above solvent, and at least the sheet for applying the liquid to at least the sheet. It is also considered to occur in the processing device.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an apparatus for removing an image forming substance from a recording sheet and a sheet processing apparatus capable of reducing the breakage, wrinkles and elongation of the sheet. Is to provide.

[0009]

In order to achieve the above object, the invention of claim 1 uses a liquid applying means for recording the image-forming substance from a recording sheet having the image-forming substance adhered to the surface thereof. In an apparatus for removing an image-forming substance from a recording sheet that performs at least a liquid application process on a recording sheet, a first holding and conveying means for conveying the recording sheet in the apparatus, and the recording sheet to which the liquid is applied by the liquid applying means. To
A control means is provided for driving and controlling the second holding and conveying means, which conveys at a position downstream of the first holding and conveying means in the conveying direction, so as to cause slack in the recording sheet between the two holding and conveying means. It is a feature.

According to a second aspect of the present invention, in the image forming substance removing device for a recording sheet according to the first aspect, the control means is set to a predetermined time during a period in which the recording sheet is sandwiched and conveyed by the both nipping and conveying means. During the period, the carrying speed by the second holding and carrying means is set to be higher than the carrying speed by the first holding and carrying means.

According to a third aspect of the present invention, in the image forming substance removing device for a recording sheet according to the first aspect, slack amount detecting means for detecting a slack amount of the recording sheet between the both holding and conveying means is provided, and the control is performed. The means is configured to switch the driving condition based on the output of the slack amount detecting means so that the slack amount does not increase at least when the slack of the recording sheet between the sandwiching and conveying means reaches a predetermined amount. It is characterized by that.

According to a fourth aspect of the present invention, there is provided a liquid applying means for applying a liquid to the recording sheet on which the image forming substance is stably attached, and an image forming substance on the recording sheet in a state where the liquid is applied. On the other hand, a peeling member that exerts a larger adhesive force than the recording sheet is used for the recording after the surface of the peeling member comes into contact with the image forming substance on the recording sheet while holding the recording sheet between the backup member and the backing member. An image from a recording sheet having an image-forming substance peeling unit that is driven so as to be separated from the sheet, and a drying unit that dries the recording sheet from which the image-forming substance is peeled In the forming substance removing device, the interval between the facing position of the peeling member and the backup member and the gripping start position of the recording sheet in the drying means is larger than the length of the recording sheet in the conveyance direction. Ku is set, is characterized in that it has provided a conveying means for conveying at underpinning recording sheet to the gap.

According to a fifth aspect of the present invention, in at least a sheet processing apparatus for performing a liquid applying process on a recording sheet by the liquid applying unit, a first holding and conveying unit for conveying the sheet in the apparatus and a liquid by the liquid applying unit. And a second holding and conveying unit that conveys the given sheet at a position downstream of the first holding and conveying unit in the conveying direction, and a control unit that drives and controls the slack of the sheet between the two holding and conveying units. It is characterized by being provided.

[0014]

In the invention of claims 1 to 3 or 5,
The control means drives and controls the first sandwiching and conveying means and the second sandwiching and conveying means arranged at a position downstream of the first sandwiching and conveying means so that a slack in the sheet occurs between the two sandwiching and conveying means. Even if the recording sheet is nipped and carried by the two nipped carrier means at the same time, the recording sheet is not stressed in the carrying direction.

In particular, according to the second aspect of the invention, since the both holding and conveying means are made to have a difference in conveyance speed only for a predetermined period, the predetermined slack is set by setting the predetermined period regardless of the length of the recording sheet in the conveyance direction. Can be formed. The predetermined period is set so that the predetermined slack is such that the recording sheets are not folded over.

Further, according to the third aspect of the invention, based on the output of the slack amount detecting means, the slack amount does not increase at least when the slack of the recording sheet between the sandwiching and conveying means reaches a predetermined amount. Drive conditions are switched as follows. The predetermined amount is the amount of slack just before the recording sheets are folded.

According to another aspect of the invention, the distance between the opposing position of the peeling member and the backup member constituting the sandwiching / conveying means and the sandwiching start position of the recording sheet in the drying means is set in the conveying direction of the recording sheet. Since the length is set larger than the length, the recording sheet is not held by both sides at the same time. Then, between the two, the recording sheet is conveyed by a conveying unit that conveys the recording sheet with a support. Therefore, no stress is generated on the recording sheet between them.

[0018]

EXAMPLES In the following, according to the present invention, from a transfer paper as an image carrier on which an image is formed by a transfer type electrophotographic copying machine, a hydrophobic and thermo-flexible electrophotographic toner as an image forming substance ( Hereinafter, an embodiment applied to an image forming substance removing device (hereinafter, referred to as a toner removing device) from an image carrier for removing the toner will be described.

First, an outline of an example of a toner removing device to which the present invention can be applied will be described. In FIG. 1, the apparatus for removing toner from copy paper according to the embodiment includes a paper feed unit 20 that separates and feeds the papers 10 on which toner images are formed that are stored in a stacked state, and a paper feed unit 20. A liquid supply unit 30 for supplying liquid to the paper 10 sent from
A toner removing unit 40 that removes toner from the liquid-supplied paper 10, a drying unit 60 that dries the toner-free paper 10, and a paper receiving unit 70 that receives the paper 10 discharged from the drying unit 60. I have it.

In the paper feeding unit 20, the paper 10 stacked on the paper feeding table 21 with the surface on which the toner image is formed (hereinafter referred to as the toner image surface) facing downward is fed from the lowermost paper feeding roller. The paper is fed by 22 and the double feed is separated by the pair of separation rollers 23, and only one sheet of paper 10 is fed by the pair of paper feed rollers 24. 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 supply unit 30 is composed of water or paper 10.
A liquid 31 such as an aqueous solution containing a surfactant is supplied to the paper 10 in order to improve the permeability of the liquid into the paper 10. A liquid container 32 for containing the liquid and a partial liquid in the liquid container 32 are provided. An application roller 33 which is provided so as to be submerged in the paper and is supplied to the toner image surface of the paper 10 by rotation, and a paper regulating member which is provided so as to face the application roller 33 with the paper conveyance path interposed therebetween. A regulation roller 34 is provided. As the application roller 33, a material having a liquid retaining property, for example, a roller made of a hydrophilic porous material, sponge, or a roller made of an elastic body such as rubber or a rigid body such as metal can be used. When using the latter roller, it is desirable to form a plurality of pumping grooves extending in the axial direction.

The regulating roller 34 is the coating roller 33.
The paper 10 is guided to the surface of the paper, and is provided so as to face the coating roller 33 with a gap that is approximately the same as or larger than the thickness of the paper 10 that has been increased by the supply of water.

The liquid supply unit 30 also guides the paper 10 sent from the paper feed unit 20 to a portion (hereinafter, referred to as a liquid supply unit) facing the application roller 33 and the regulation roller 34. A mechanism 35 and a second paper guide mechanism 36 that guides the paper 10 that has passed through the liquid supply unit to the toner removal unit 40 side are provided. Further, the liquid container 32 is provided with a liquid removal plug 37 for draining the liquid 31.

The toner removing unit 40 is provided in such a manner that a peeling belt 44 as a sheet-like peeling member wound around a plurality of supporting rollers 41, 42, 43 and a peeling belt 44 are sandwiched and pressed against each other. Heating lamp 45
The upper and lower heating rollers 45 and 46 with built-in a and 46a and the belt cleaning device 47 that removes toner from the surface of the peeling belt 44 are provided. At least the surface of the peeling belt 44 is formed of a material that is easily attached to the softened toner. For example, the belt itself is made of a metal material such as an aluminum-based material, a copper-based material, a nickel-based material, or a polymer-based material such as polyethylene terephthalate (PET) in which titanium oxide is dispersed. When polymer material is used as the surface material, it prevents elongation due to tension or heat,
From the viewpoint of durability and the like, it is desirable to have a multilayer structure of at least two layers of a base and a surface layer.

Among the rollers that support the peeling belt 44, the direction of movement of the belt is rapidly changed around the small diameter roller 43 around which the belt portion after passing through the pressure portions of the upper and lower heating rollers 45 and 46 winds. Thus, the curvature separation of the paper 10 from the peeling belt 44 can be performed. Further, the support roller 42 around which the belt portion entering the pressurizing portion is wound is a crown roller for preventing the belt deviation. There is also provided a tension roller 49 that pushes inward the belt portion between the support roller 42 and the support roller 41 facing the belt cleaning unit.

The upper and lower heating rollers 45 and 46 are
The toner image surface of the paper 10 is brought into close contact with the peeling belt 44, and the toner fixed to the paper 10 is heated and softened. It is desirable that this heating be performed at a pressure contact portion between the upper heating roller 45 and the peeling belt 44 so that the toner on the paper 10 is not melted.

Further, the belt cleaning unit 4
Reference numeral 7 denotes a rotating brush roller 50 that applies an intermittent scratching force to the peripheral surface of the peeling belt 44 to remove the adhered toner, and a frictional force that contacts the peripheral surface of the belt on the downstream side of the rotating brush roller 50 in the belt moving direction. And a pad 51 for removing the adhered toner by scrubbing with the unit casing 52.
It is designed to be housed inside. The toner removing unit 40 is also provided with a guide member 54 for guiding the paper 10 that has passed through the pressing portion and is curvature-separated from the peeling belt 44 by the small-diameter roller portion to the drying unit 60 side. .

The drying unit 60 is for drying the paper 10 so that the liquid holding amount of the paper 10 is 10% or less of the paper weight, for example, a heating drum 61 having a heating lamp 61a and made of, for example, aluminum. A plurality of support rollers 62
And a paper pressing belt 63 that is endlessly moved around the heating drum 61 at a fixed angle. In the illustrated example, one support roller 62 also serves as a tension roller. It is desirable to use the heating drum 61 having a diameter such that the paper 10 does not easily curl, for example, a diameter of about 90 mm or more. (Hereafter, margin)

As the material of the paper pressing belt 63, a material having heat resistance and air permeability, for example, cloth such as canvas cloth, cotton cloth, Tetoron cloth or the like can be used. It is desirable to use a material that does not stretch as much as possible. In order to prevent the paper 10 from shrinking and wrinkling in a completely free form while the drying progresses in the area wound around the heating drum, and to prevent the paper 10 from curling or waviness. The paper 10 can be held between the peripheral surface and the inner surface of the belt with a certain amount of force.

In the drying unit 60, the paper 10 that has passed through the holding region between the heating drum and the paper pressing belt.
A guide member 64 for guiding the sheet and a pair of discharge rollers 65 for discharging the sheet 10 guided by the guide member 64 onto the sheet receiving surface of the sheet receiving unit 70 are provided.

In the above structure, the paper 10 sent from the paper feeding unit 20 is uniformly supplied with the liquid on the toner image surface by the liquid supply unit 30, and is sent to the toner removing unit 40. In the toner removing unit 40, the toner adhered to the paper is softened by the heating from the heating rollers 45 and 46 and adheres to the surface of the peeling belt 44. When the paper is separated from the peeling belt 44 around the small-diameter roller 43, the toner adhering to the surface of the peeling belt 44 is peeled from the paper, whereby the toner is removed from the paper. The paper from which the toner has been removed is dried by the drying unit 61 and discharged to the paper receiving unit 70.

As described above, according to the toner removing device for copying paper, since the liquid is supplied to the paper on which the toner adheres and the liquid is permeated into the interface between the paper and the toner, the toner is peeled off. Toner can be removed without damaging the fibers.

Here, in the toner removing device,
A pair of sheet feeding / conveying rollers 24 of the sheet feeding unit 20 and a toner removing unit 40 are provided as a holding and conveying unit for conveying the recording sheet.
The upper heating roller 45 and the peeling belt 44, the heating drum 61 of the drying unit 60, and the paper pressing belt 63. Depending on the conveyance speed settings of these three holding and conveying means, the transfer paper 10 may be stretched, cut, creased in the conveyance direction, folded, or the like as described above.

Hereinafter, a transfer paper conveying method for preventing such a problem will be described. First, the first transfer method will be described with reference to FIGS. Figure 2 (a)
In the above, the first conveying roller pair 1 and the second conveying roller pair 2 as the sandwiching conveying means are arranged so that the latter is on the downstream side in the conveying direction of the transfer paper 10, and a paper guide is provided between both roller pairs. A plate 4 is arranged. Here, the second conveyance roller pair 2
In order to know the time when the leading edge of the transfer paper enters the nip, the paper detection sensor 3 is arranged immediately before the second conveying roller pair, for example.

The signal from the paper detection sensor 3 is used in FIG.
Drive control of both roller pairs 1 and 2 is performed as shown in the timing chart of FIG. That is, the leading edge of the transfer paper is the second
Until the nip of the transport roller pair 2 is reached, both the roller pairs 1 and 2 are driven so as to have the normal transport speed V0. Then, when the leading edge of the transfer paper is detected by the paper detection sensor 3, the carrying speed of the second carrying roller pair 2 is switched to a low speed V1 slower than the normal carrying speed V0. When a set time T1 corresponding to the time required for the transfer paper front end portion to pass through the nip of the second transfer roller pair 2 from the time when the transfer paper front end is detected passes, the transfer speed of the second transfer roller pair 2 is changed. Return to normal transport speed. According to this, the rear end portion is conveyed at the normal speed V0 by the first conveying roller pair 1, while
During the period T2 in which the leading end portion is transported by the transport roller pair 2 at a low speed V1, the transfer paper portion between the transport roller pair 1 and 2 is bent. Therefore, stress does not occur on the transfer paper, and it is possible to prevent the spread, breakage, and wrinkles in the transport direction.
Further, since the maximum amount of slack is determined by the time T2 and the difference (V0-V1) between the two velocities, it is possible to set the maximum amount of slack so that folding does not occur. Wrinkles can also be prevented.

The paper detection sensor 3 can determine the timing of speed switching of the second conveying roller pair 2 by using the signal from now on alone or in combination with other timing information such as the paper feed start signal of the apparatus. As long as you can do it, you can place it in other places as long as you can achieve this aim. For example, it may be on the downstream side of the second conveying roller pair 2. In this case, the switching to the low speed V0 may be performed by using other timing information, and the return to the normal speed may be performed using the signal of the paper detection sensor. Alternatively, the switching to the low speed V0 may be performed at the leading end of the transfer paper. However, the signal of the paper detection sensor may be used to perform the process after passing through the nip of the second conveying roller pair 2 to some extent. Further, in the illustrated example, the contact type sensor is used as the paper detection sensor, but a non-contact type sensor using light or the like may be used.

Further, as described above, the pair of conveying rollers 1 and 2
In order to drive the rollers at different transport speeds for a predetermined period of time, dedicated drive motors 1a and 2a may be used, for example, as shown in FIG.

FIGS. 4 (a) and 4 (b) are explanatory views of another transfer sheet conveying method for preventing the above-mentioned problems. Figure 4
3A is different from the structure of FIG. 3A only in that it is provided so as to pass through the paper detection sensor 5 for detecting the amount of slack. Using the signal from the paper detection sensor 5 for detecting both the slacks, the control shown in FIG. 4B is performed.

That is, in FIG.
Similar to the control in (b), when the leading edge of the paper detection sensor 3 detects the leading edge of the paper, the transport speed of the second transport roller pair 2 is switched to the low speed V1. Then, the return from the low speed V1 to the normal speed V0 is performed at the time when the paper is detected by the paper detection sensor 5 for detecting both the slack. According to this
By setting the arrangement of the paper detection sensor 5 for detecting the amount of slack so as to detect the slack portion when the slack of the transfer paper is slack in the range where folding does not occur, the second It is possible to return the conveying speed of the conveying roller pair 2 to the normal speed and prevent the slack amount from increasing further.

By applying the above-described conveying method shown in FIGS. 3 and 4 to the toner removing device shown in FIG. 1, the above-mentioned problems of the transfer sheet can be prevented. That is, as one combination,
The pair of sheet feeding / conveying rollers 24 of the sheet feeding unit 20 corresponds to the first pair of conveying rollers 1, and the upper heating roller 45 and the peeling belt 44 of the toner removing unit 40 are the second pair of conveying rollers 2.
As shown in FIG. 3 and FIG. 4, the conveyance speeds of these are controlled. As another combination, the upper heating roller 45 and the peeling belt 44 of the toner removing unit 40 correspond to the first conveying roller pair 1, and the heating drum 61 and the paper pressing belt 63 of the drying unit 60 perform the second conveying. Assuming that it corresponds to the roller pair 2, the conveying speed of these is controlled as shown in FIGS. Furthermore, each of these two combinations is established sequentially as the transfer paper 10 moves, so that the above-mentioned transfer paper does not have any trouble in any part of the transport area from the paper feeding unit 20 to the drying unit 60. May be.

In the carrying method shown in FIGS. 3 and 4,
The conveying speed of the downstream holding and conveying means was switched to a low speed to form a conveyance speed difference between the holding and conveying means on the upstream side, which caused a deflection, but on the contrary, the conveying speed of the holding and conveying means on the upstream side was set to a high speed. You can switch to.

Next, with reference to FIG. 5, a toner removing device according to another embodiment capable of preventing the above-mentioned transfer paper trouble will be described. In FIG. 5, the toner removing device of this embodiment is different from the toner removing device of FIG. 1 in that a pair of sheet feeding and conveying rollers 24 of a sheet feeding unit, which is a nipping and conveying means, and a first nipping and conveying means on the downstream side thereof. Toner removal unit 4
Distance L ₁ between the heating roller 45 and the peeling belt 44 over the 0, and, the upper heating roller 45 and the peeling belt 44 of the toner removing unit 40, the heating roller on which according downstream is the first clamping conveying means of the world The distance L ₂ to the peeling belt 45 and the peeling belt 44 (specifically, the gripping start position thereof) is set to be larger than the length of the transfer paper to be processed in the transport direction, and the transfer paper transport at both intervals is performed by the base support transfer paper. The point is that the conveyor belt devices 80 and 81 for conveying the are used. The other points are the same as those of the toner removing device shown in FIG. According to the toner removing apparatus of the present embodiment, the transfer paper is not held at the same time between any pair of holding and conveying means, so that all of the above-mentioned problems of the transfer paper can be eliminated. It should be noted that only the distance L _{2 in} the drawing where the above-mentioned transfer paper failure is particularly likely to occur is longer than the length in the transport direction of the transfer paper, and the distance L _{1 in} the drawing may adopt the same configuration as in FIG. . In this case, the interval of L _{1 in} the figure is as shown in FIG.
It is desirable to adopt the transportation method of.

In each of the above-described embodiments, the pair of sheet feeding / conveying rollers 24 of the sheet feeding unit 20, the upper heating roller 45 and the peeling belt 44 of the toner removing unit 40, the heating drum 61 of the drying unit 60, and the paper as the pinching and conveying means. Although the three pressing belts 63 have been described, the same conveying method or the like can be applied between the adjacent holding and conveying means in the conveying direction also when the holding and conveying means is provided in addition to these. For example, the liquid removing roller or the like of the water-supplying surface layer is provided as a pair with a dedicated backup roller, or an existing member such as the belt support roller 43 in FIG. In the case of the above, as long as the holding and conveying force is generated, these correspond to the holding and conveying means.

Further, the conveying speed in the apparatus may be changed according to the temperature in the apparatus. In particular, in order to shorten the waiting time after the power is turned on, the conveyance may be performed at a low speed at the beginning, and the conveyance speed may be switched to a high speed as the temperature inside the apparatus rises.

Here, in the toner removing device of FIG.
The result of checking the presence or absence of a defect in the transfer sheet by variously changing the conveyance speed setting among the above-mentioned three holding and conveying means will be described. First, the elongation of the transfer paper in the lateral direction (direction perpendicular to the fibers) due to the wetting of the transfer paper is 2 to 3% as shown in Table 1. Here, 4 to 5 g of liquid was absorbed per A4 1 sheet. As the liquid, a 1% by weight aqueous solution of a surfactant (BT-7 (trade name) manufactured by Nikko Chemicals Co., Ltd.) was used.

[Table 1]

With such elongation, the paper strength decreases due to wetting, resulting in breakage due to stress during transportation, wrinkles and elongation, and the quality of recycled paper deteriorates. When the pulling and conveying of the transfer paper used in a normal copying machine is applied to the toner removing device of FIG. 1, the paper is cut or the maximum is 6% (elongation is 18% for A4 vertical dimension 297 mm).
mm) paper elongation was observed.

Therefore, the carrying speed of each of the holding and carrying means is set to the carrying speed 3 of the upper heating roller 45 and the peeling belt 44.
With respect to 0 (mm / sec), the conveyance speed of the pair of paper feed conveyance rollers 24 and the conveyance speed of the upper heating roller 45 and the peeling belt 44 were made different, and each defect was examined. Is. This table 2 is Ricoh type 6 which is Ricoh paper
200 (commercial name, paper is cut so that the horizontal direction is the long side direction), and Table 3 is an experimental result for recycled paper Ricoh resource type A (commercial name) manufactured by Ricoh. . In this experiment, PET containing TiO ₂ was used as the peeling belt, and the set temperatures of the upper heating roller 45, the lower heating roller 46, and the heating drum 61 were set to 101 ° C, 83 ° C, and 114 ° C, respectively. Further, in each table, in the column of “increase / decrease rate of linear velocity (%)”, from the left, the conveying speed of the pair of feeding / conveying rollers 24, the conveying speed of the upper heating roller 45 and the peeling belt 44 is 30 (mm / sec). , And,
The increase / decrease ratio of the transport speed of the upper heating roller 45 and the peeling belt 44 to the transport speed of the upper heating roller 45 and the peeling belt 44 is displayed.

[Table 2]

[Table 3]

As can be seen from the above Tables 2 and 3, the rate of increase / decrease in the conveyance speed of the pair of paper feed conveyance rollers 24 with respect to the conveyance speeds of the upper heating roller 45 and the peeling belt 44 is + 5% to +.
It is necessary to set it within the range of -10%, preferably + 3% to -3%. Above the increase limit, wrinkles occur, and below the decrease limit, cutting occurs. In addition, the upper heating roller 4 and the peeling belt 44 are conveyed at the same speed.
5 and the increase / decrease ratio of the peeling belt 44 to the conveying speed
It needs to be within the range of + 5% to -20%. Cuts occur above the limit of increase, and wrinkles occur below the limit of decrease.

From the above results, in the case of prioritizing the prevention of elongation or breakage of the transfer paper, for the conveyance to the peeling unit, the conveyance speed of the feed conveyance roller pair 24 is set to the upper heating roller 45 and the peeling belt 44. The transfer speed is set faster than the transfer speed and the increase / decrease rate is within + 5% to 0%. Regarding the conveyance between the peeling unit and the drying unit, the conveying speed of the upper heating roller 45 and the peeling belt 44 is set higher than the conveying speed of the upper heating roller 45 and the peeling belt 44, and the increase / decrease rate is + 5% to +. Keep it in the range of 0%.

On the other hand, when priority is given to the prevention of the wrinkling of the folded transfer paper, the conveyance speed of the pair of paper feed conveyance rollers 24 is set to the conveyance speed of the upper heating roller 45 and the peeling belt 44 for the conveyance to the peeling unit. However, the rate of increase and decrease is kept within the range of 0% to -10%. Regarding the conveyance between the peeling unit and the drying unit, the conveyance speed of the upper heating roller 45 and the peeling belt 44 is set to the upper heating roller 4
5 and the peeling belt 44 are conveyed at a slower speed, and the rate of increase or decrease is within the range of 0% to -20%.

Although the above-described embodiment is an application of the present invention to a toner removing device for removing toner, which is an image-forming substance, from a normal transfer paper 10, the present invention is not limited to this, and liquid deposition is possible. If there is a risk of wrinkles or breakage due to the image formation, image formation from an image carrier composed of a laminate in which the surface layer of the base sheet such as a plastic layer is a material layer having a liquid absorbing property and elasticity such as paper It can also be applied to a substance removing device. Further, the invention is not limited to the toner removing device and the like, and can be applied to, for example, a device in which the aqueous solution of the surfactant is applied to the transfer paper in advance and then dried so that the toner removing device can easily remove the toner. It can also be applied to a drying device for a sheet to which other liquids are attached.

[0052]

According to the first to third aspects of the invention, even if the recording sheet is simultaneously gripped and conveyed by the pair of sandwiching and conveying means arranged at intervals in the conveying direction, stress in the conveying direction is exerted. Since the recording sheet is not damaged, it is possible to prevent the recording sheet from being stretched or cut, and wrinkles in the transport direction.

In particular, according to the invention of claim 2, a predetermined amount of slack can be formed in a range in which folding does not occur by setting a period in which both holding and conveying means have a conveying speed difference, so that the recording sheet is conveyed in the conveying direction. Wrinkles can be reliably prevented regardless of the length.

According to the third aspect of the present invention, the slack amount does not increase at least when the slack of the recording sheet between the sandwiching and conveying means reaches a predetermined amount based on the output of the slack amount detecting means. Since the driving conditions are switched as described above, the amount of slack can be set within a range in which folding does not occur, regardless of the material and type of the recording sheet and the length in the transport direction. Therefore, folding wrinkles can be reliably prevented regardless of the material and type of the recording sheet and the length in the conveying direction.

According to the fourth aspect of the invention, the recording sheet is sandwiched at the same time by both the facing portion of the peeling member and the backup member constituting the sandwiching and conveying means and the sandwiching start portion of the recording sheet in the drying means. Since the recording sheet is not stressed between the two, and the recording sheet is conveyed between the two by the conveying means that conveys the recording sheet by the underpinning, the recording sheet due to the stress Can prevent stretching, wrinkles, and breaks.

According to the fifth aspect of the invention, even if the sheet is held and conveyed by the pair of holding and conveying means arranged at intervals in the conveying direction, the sheet is not stressed in the conveying direction. It is possible to prevent elongation and breakage of the paper, and wrinkles in the transport direction. In addition, since the slack does not exceed the predetermined range, folding creases can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a toner removing device to which the present invention can be applied.

FIG. 2A is an explanatory diagram of a sheet conveying method in the toner removing device according to the embodiment. (B) is a timing chart regarding the same transportation method.

FIG. 3 is an explanatory diagram of a drive system that can be used in the carrying method.

FIG. 4A is an explanatory diagram of a sheet conveying method in a toner removing device according to another embodiment. (B) is a timing chart regarding the same transportation method.

FIG. 5 is a schematic configuration diagram of a toner removing device according to another embodiment.

6A to 6C are explanatory views of the problems of the present invention.

[Explanation of symbols]

 10 Paper 20 Paper Feed Unit 24 Paper Feed Conveyor Roll Pair 30 Liquid Supply Unit 40 Toner Removal Unit 45 Upper Heating Roller 46 Lower Heating Roller 44 Peeling Belt 60 Drying Unit 61 Heating Drum 63 Paper Pressing Belt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Watanabe 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Masatoshi Saito 1-3-6 Nakamagome, Ota-ku, Tokyo Shares Company Ricoh

Claims (5)

[Claims] 1. An apparatus for removing an image-forming substance from a recording sheet, wherein at least a liquid-applying process is performed on the recording sheet by a liquid-applying means to remove the image-forming substance from the recording sheet having the image-forming substance adhered to the surface thereof. A first holding and conveying means for conveying a recording sheet in the apparatus,
The recording sheet to which the liquid has been applied by the liquid applying means is a recording sheet between the two holding and conveying means, and the second holding and conveying means which conveys the recording sheet at a position downstream of the first holding and conveying means in the conveyance direction. An apparatus for removing an image forming substance from a recording sheet, characterized by comprising control means for controlling driving so as to cause slack. 2. The control means controls the conveyance speed of the second holding / conveying means for a predetermined period of a period during which the recording sheet is being held and conveyed by the both holding / conveying means.
2. The apparatus for removing an image-forming substance from a recording sheet according to claim 1, wherein the apparatus is configured to be set at a speed higher than the carrying speed by the holding and carrying means. 3. A slack amount detecting means for detecting a slack amount of a recording sheet between the both holding and conveying means is provided, and the control means is provided between the both holding and conveying means based on an output of the slack amount detecting means. The apparatus for removing an image-forming substance from a recording sheet according to claim 1, wherein the driving condition is switched so that the slack amount of the recording sheet reaches a predetermined amount at least when the slack amount does not increase. 4. A liquid applying means for applying a liquid to a recording sheet on which an image forming substance is stably attached, and a recording sheet for the image forming substance on the recording sheet in a state where the liquid is applied. The peeling member, which exerts a larger adhesive force, is separated from the recording sheet after its surface comes into contact with the image-forming substance on the recording sheet while holding the recording sheet with the backup member. In an apparatus for removing an image-forming substance from a recording sheet, the image-forming substance removing unit driving the image-forming substance and a drying unit for drying the recording sheet from which the image-forming substance has been peeled by the image-forming substance is held and conveyed. The gap between the facing position of the peeling member and the backup member and the gripping start position of the recording sheet in the drying means is set to be larger than the length of the recording sheet in the conveyance direction, and the gap is set. An image forming substance removing apparatus from a recording sheet, characterized in that a conveying means for conveying the recording sheet by a supporting member is arranged on the sheet. 5. A sheet processing apparatus for performing a liquid applying process on a recording sheet by at least a liquid applying means, comprising: a first holding and conveying means for carrying the sheet in the apparatus; and a sheet to which the liquid is applied by the liquid applying means. A control means for driving and controlling the second holding and conveying means, which conveys the sheet at a position downstream of the first holding and conveying means in the conveying direction, so as to cause slack in the sheet between the two holding and conveying means. Sheet processing device.