JPH09146378A - Transfer paper peeling and carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer roller withstanding wear for thick recording paper. SOLUTION: In this device, a latent image formed on a recording medium is developed with toner, and then the recording paper 50 on which a toner image has been transferred is peeled from the recording medium and fed while the toner image is transferred on the recording paper 50. In such a case, the device is equipped with the transfer roller 5 provided to press the recording paper 50 to the recording medium, and a peeling belt 12 introduced into a nip together with the recording paper 50, holding one side edge part of the recording paper 50 with the transfer roller 5, and peeling the recording paper 50 from the recording medium when it is fed out from the nip together with the recording paper 50. The transfer roller 5 has a 1st area 5a equipped with a coating layer formed of dielectric material on its outer peripheral surface and a 2nd area 5b equipped with a coating layer formed of material having higher wear resistance than the dielectric material in the area of the outer peripheral surface coming in contact with the peeling belt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper peeling / conveying apparatus, and more particularly to a thick recording paper using a transfer roller and a peeling belt for a toner image obtained by visualizing a latent image formed on a recording medium with toner. The present invention relates to an apparatus for peeling a recording paper from a recording medium after the transfer to a sheet and conveying the recording paper.

[0002]

2. Description of the Related Art In a magnetic printing apparatus or an electrophotographic apparatus, a latent image is magnetically or electronically formed on a recording medium such as a magnetic drum or a photosensitive drum, and toner is attached to the latent image for development or development. To be done. The toner image on the recording medium is transferred to a sheet-shaped recording paper by a transfer paper peeling / conveying device. Then, the toner image transferred onto the recording paper is heated and pressed by the fixing device to be permanently fixed on the recording paper.

Conventionally, a transfer paper peeling / conveying apparatus used in this type of magnetic printing apparatus or electrophotographic apparatus uses a corona discharger or a transfer roller having a dielectric layer formed on the surface. At this time, a transfer roller to which a high DC voltage is applied has a higher transfer efficiency as compared with a corona discharger and generates less ozone, and thus has been widely used. When the transfer roller is used, the toner image is transferred from the recording medium to the recording paper by the action of the pressure and the electric field while the recording paper passes through the nip formed between the transfer roller and the recording medium. 2. Description of the Related Art A transfer paper peeling / conveying device equipped with a peeling belt has been conventionally used to prevent a recording paper pressed against a recording medium by a transfer roller from adhering to the recording medium and moving together with the recording medium. The peeling belt is introduced into the nip together with the recording paper while being in contact with the edge portion of the recording paper which is out of the printing area on the surface of the recording paper on which the toner image is transferred. When the recording paper and the peeling belt are discharged from the nip, the recording paper is pinched between the peeling belt and the transfer roller and peeled off from the recording medium.

[0004]

As described above, a dielectric layer is formed on the surface of the transfer roller with a rubber material such as epichlorohydrin. The rubber material forming this dielectric layer is abrasion resistant. It has a relatively low wear resistance and is easily worn. When the recording paper used in the magnetic printing apparatus or the electrophotographic apparatus has a basis weight of, for example, about 60 to 100 g / m ^{2, the} entire coating layer on the surface of the transfer roller is covered with the above dielectric material. Even if it is made of a material, the abrasion of the coating layer on the recording paper is sufficiently small, and a life of, for example, 500,000 prints or more can be obtained. However, the recording paper used is 1
In the case of a thick recording paper having a grammage of about 10 to 210 g / m ² or more, since the recording paper has a high bending stiffness, it was sandwiched between the peeling belt and the transfer roller. The edge of the recording paper moves while rubbing the surface of the transfer roller, the area near the end of the transfer roller is worn in a relatively short time, and the life of the transfer roller is reduced to, for example, about 50,000 prints. There's a problem.

The present invention aims to solve the above-mentioned problems of the prior art, and it is 110 to 210 g.
An object of the present invention is to provide a transfer paper peeling / conveying device provided with a transfer roller that withstands abrasion even for a thick recording paper having a basis weight of about / m ² or more.

[0006]

In order to solve the above problems, in the transfer roller of the transfer paper peeling / conveying device according to the present invention, the coating layer corresponding to the image area for transferring the toner image is formed of a dielectric material. However, the coating layer corresponding to the area where the toner image is not formed is made of a wear-resistant rubber or resin material to prevent the transfer roller from being worn when a thick recording paper is used.

That is, according to the present invention, after the latent image formed on the cylindrical recording medium rotatably provided is visualized with toner, the toner image is transferred from the recording medium while transferring the toner image onto the recording sheet. In a transfer paper peeling and conveying device for peeling and transferring a recording paper on which an image is transferred, a transfer roller provided so as to form a nip with the recording medium and press the recording paper against the recording medium. , Is stretched so as to come into contact with the outer peripheral surface near one end of the transfer roller, is introduced into the nip together with the recording paper, and holds one side edge of the recording paper with the transfer roller. Which is a peeling belt for discharging from the nip together with the recording paper,
A peeling belt for peeling the recording paper from the recording medium, wherein the transfer roller is in contact with the peeling belt and a first region having a coating layer formed of a dielectric material on the outer peripheral surface thereof. A transfer paper peeling / conveying device, characterized in that it has a second region having a coating layer formed of a material having higher abrasion resistance than the dielectric material in an outer peripheral surface region. And The second coating layer may be a wear-resistant thin film.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment will be described with reference to the accompanying drawings, taking the case where the present invention is applied to a magnetic printing apparatus as an example. First, the configuration of a magnetic printing apparatus to which the transfer sheet peeling / conveying apparatus of the present invention is applied will be outlined with reference to FIG. The sheet-shaped recording papers deposited on the recording paper mounting bases 31 and 32 are fed by the paper feeding devices 23 and 24, and are fed by the paper feeding guides 23a and 24a and the feeding rollers 25b and 25a to the magnetic drum 1 as a recording medium. Sent to.

The magnetic drum 1 has a high speed, for example, 3000r.
At pm, the magnetic recording head 2 forms a magnetic latent image on the surface of the rotating magnetic drum 1. As is well known, the magnetic recording head 2 is separated from the surface of the magnetic drum 1 with a minute gap (for example, 0.3 to 3 μm), and as shown by an arrow B in FIG. It is configured to reciprocate in parallel axis directions. When a magnetic latent image is formed on the surface of the magnetic drum 1, a development process is started, and the magnetic drum 1 is moved at a low speed.
For example, it rotates in the direction of arrow A at 100 rpm. During this time, the toner 4 in the developing device 3 is supplied toward the surface of the magnetic drum 1 by a plurality of rollers, and adheres to the surface of the magnetic drum 1 according to the magnetic latent image formed by the magnetic recording head 2 to form a latent image. To be imaged.

A transfer paper peeling / conveying device 10 is arranged in the vicinity of the side opposite to the magnetic recording head 2 in the magnetic drum 1. The transfer sheet peeling / conveying device 10 includes a transfer roller 5 arranged so as to form a nip with respect to the magnetic drum 1. The recording paper is fed to the nip between the magnetic drum 1 and the transfer roller 5 in synchronization with the timing of the magnetic latent image on the magnetic drum 1. A dielectric layer (not shown) is formed on the outer peripheral surface of the transfer roller 5 with a rubber material such as epichlorohydrin, and a DC voltage is applied to the dielectric layer by an appropriate DC power supply device (not shown). By applying a DC voltage to the dielectric layer and pressing the recording paper passing through the nip against the magnetic drum 1, the toner image on the magnetic drum 1 is transferred to the recording paper. Transfer paper peeling and conveying device 1
0 is to prevent the recording paper pressed by the transfer roller 5 against the magnetic drum 1 from adhering to the magnetic drum 1.
A peeling belt 12 is provided. The peeling belt 12 is introduced together with the recording paper into the nip while being in contact with the edge of the recording paper on which the toner image is transferred, the edge of the recording paper being out of the printing area, and the recording paper and the peeling belt are discharged from the nip. When fed, the peeling belt 12 peels off the recording paper from the magnetic drum 1. The transfer paper peeling / conveying device 10 will be described in more detail later.

The toner remaining on the outer peripheral surface of the magnetic drum 1 without being transferred onto the recording paper is removed from the magnetic drum 1 by a cleaning device 7 having a toner suction device and a cleaning blade. When rewriting the magnetic latent image on the magnetic drum 1, the conventional magnetic latent image is erased by the erasing head 8.

Next, the recording paper on which the toner image is transferred is transferred to the fixing device 15 by the recording paper transfer device 26. The fixing device 15 includes a pair of rollers as can be understood from FIG. 1. One of the pair of rollers is a heated fixing roller and the other forms a nip with respect to the fixing roller. It is a pressing roller provided. When the recording paper carrying the toner image passes through the nip in the fixing device 15, the recording paper is pressed against the fixing roller by the pressing roller, whereby the toner particles constituting the toner image are softened, Infiltrate When the recording paper passes through the fixing device 15, the softened toner image is cooled and permanently fixed on the recording paper. A fixing separation claw 28 is provided adjacent to the exit side of the fixing device 15 to prevent the recording paper from adhering to the fixing roller or the pressing roller. Next, the recording paper passes between the pair of discharge rollers 29 and is deposited on the recording paper receiver 40.

The transfer paper peeling and conveying device 10 according to the present embodiment will be described below with reference to FIGS. 2 to 4. 2 is a schematic front view of the transfer paper peeling / conveying device 10 as viewed in the direction indicated by the arrow 2-2 in FIG. 4, and the magnetic drum 1 is indicated by a chain double-dashed line in FIG. Further, FIG. 3 is a schematic side view of the transfer paper peeling / conveying device 10 as viewed in the direction of arrow 3-3 in FIG.

The transfer paper peeling / transporting device 10 includes a transfer roller 5
And a peeling belt 12 disposed near one end of the transfer roller 5. The peeling belt 12 includes a plurality of pulleys 80a, 80b, 80c, 80d, 80e, 80.
The magnetic drum 1 and the transfer roller 5 are brought into contact with a portion of the surface of the recording paper 50 on which the toner image is transferred, which is located outside the printing area, that is, a portion where the toner image is not formed, via f and 80g. It is stretched to be introduced into the nip between. That is, the pulley 80c disposed immediately before the nip between the magnetic drum 1 and the transfer roller 5
Thus, the peeling belt 12 is oriented so as to come into contact with the outer peripheral surface of the magnetic drum 1 from before the nip, and is introduced into the nip together with the recording paper 50 fed along the paper feed guide 6. At this time, the peeling belt 12 moves with the recording paper 50 by the rotation of the magnetic drum 1 and the transfer roller 5 while contacting the surface of the recording paper 50 which receives the transfer of the toner image from the magnetic drum 1. In FIGS. 3 and 4, an arrow B indicates the transport direction of the recording paper 50 discharged from the nip between the magnetic drum 1 and the transfer roller 5.

Next, the peeling belt 12 is urged toward the transfer roller 5 by the pulley 80b arranged on the exit side of the nip. Therefore, as can be understood from FIG. 3, the peeling belt 12 moves while contacting the outer peripheral surface of the transfer roller 5 so as to extend along the arc on which the center of the transfer roller 5 is about 180 °. . The recording paper 50 introduced into the nip is the transfer roller 5 and the peeling belt 1.
Since it is sandwiched between the magnetic recording medium 1 and the magnetic recording medium 2, the magnetic paper 1 is separated from the magnetic drum 1 at the exit of the nip and is urged together with the separating belt 12 toward the transfer roller 5 side. Next, the peeling belt 12 is the pulley 8
0a, 80g, 80f, 80e, 80d are sequentially passed and returned to the pulley 80c again.

The pulley 80a is attached to a suitable frame (not shown) of the magnetic printing apparatus via a tensioner 27, and is biased obliquely upward by a spring 28. As a result, the peeling belt 12 applies a constant tension to the pulleys 80a, 80b, 80c, 80d, 80e, 80.
It is stretched around f and 80g sequentially.

With particular reference to FIG. 2, the pulley 80b and the pulley 80c are arranged in the vicinity of one end of the magnetic drum 1 and the transfer roller 5 on an axis line substantially perpendicular to the rotation axes of the both. More specifically, the pulley 80
b and the pulley 80c, the peeling belt 12 is the recording paper 5
No. 0, it is arranged so as to come into contact with a portion that is not used for forming a toner image near one side edge portion 51a. When the recording paper 50 is not fed, the peeling belt 12 is in contact with an area of the transfer roller 5, which is in contact with the surface of the portion of the recording paper 50 where the toner image is not formed. In the present embodiment, as shown in FIG. 4, the transfer roller 5 has a first area 5a in a region of the recording paper 50 that contacts the surface on which the toner image is formed, and a second region 5a that contacts the surface of the recording paper 50 on which the toner image is not formed. Region 5b. In order to transfer the toner image on the surface of the magnetic drum 1 to the recording paper 50 by the action of the electric field and the pressure, the first area 5a of the transfer roller 5 must have the dielectric property, but the second area 5b. Need not be dielectric. The boundary line L between the first and second areas 5a and 5b is substantially coincident with the boundary line between the portion where the toner image is formed and the portion where the toner image is not formed on the recording paper 50.

On the other hand, when the recording paper used in the magnetic printing apparatus has a basis weight of about 60 to 100 g / m ² , the recording paper is flexible and one of the recording papers is Even if the peeling belt 12 biases the magnetic drum 1 toward the transfer roller 12 side only at the side edge portions of the recording paper, the recording paper is flexibly deformed in accordance with the shape of the transfer roller 5, and thus is displaced relative to the transfer roller 5. There is nothing to do. Therefore, the entire surface of the transfer roller 5, that is, the first and second regions 5a5b,
Even if it is formed of a dielectric material having a low abrasion resistance as described above, the abrasion of the coating layer on the recording paper is sufficiently small, and a life of, for example, 500,000 prints or more can be achieved.

However, the recording paper 50 used is 1
In the case of a thick recording paper having a basis weight of about 10 to 210 g / m ² or more, for example, a sheet of paper such as a postcard manufactured by a government, the recording paper 50 is pinched by the peeling belt 12 because of its high bending stiffness. The edge 51b on the opposite side, which is not formed, is lifted up (see FIG. 3), and the edge sandwiched between the peeling belt and the transfer roller in the recording paper 50 is the surface of the transfer roller 5, particularly the second area 50b. Relative movement while rubbing the surface. In FIG. 3, the recording paper 50 indicated by a dotted line shows such a twisted state. As a result, the outer peripheral surface of the second area 5b of the transfer roller 5 is worn. Thus, as described above, the region 5b near the end of the transfer roller 5 is worn in a relatively short time, and the life of the transfer roller 5 is reduced to, for example, about 50,000 prints.

In order to prevent this, in the present embodiment, the second region 5b of the transfer roller 5 is made of a rubber material different from that of the first region 5a, for example, rubber having high abrasion resistance such as NBR or fluororubber. It has a coating layer formed of a material. It goes without saying that the first region 5a has a dielectric layer formed of a rubber material such as epichlorohydrin. By forming the coating layer on the second region 5b with a material having high abrasion resistance, the problem that the life of the transfer roller 5 is shortened as in the prior art is solved. Further, the coating layer of the second region 5b may be formed of a material other than NBR or fluororubber, for example, a plastic or other resin or a thin film material such as PFA.

While the preferred embodiment of the present invention has been described with reference to the accompanying drawings, it is merely an example and the present invention is not limited thereto, and various modifications can be made without departing from the scope and spirit of the present invention. Those skilled in the art will understand that modifications and variations are possible.

For example, in the above-described embodiment, the case where the present invention is applied to the magnetic printing apparatus has been described, but the present invention is not limited to this, and it is applicable to an electrophotographic apparatus such as a laser printer or a copying machine. You can also Pulley 8 in the attached drawings
0g is a pulley 80b, and 80f is a transfer roller 5.
The pulley 80e is configured coaxially with the pulley 80c, but this is merely an example and the present invention is not limited to this configuration.

Further, in the above-mentioned embodiment, the peeling belt 12
Has been described so as to contact the outer peripheral surface of the transfer roller 5 along an arc whose angle of looking at the center is approximately 180 ° on the surface of the transfer roller 5, but this is merely an example,
The peeling belt 12 may be stretched so that the recording paper passing through the nip between the transfer roller 5 and the magnetic drum 1 can be peeled off from the magnetic drum 1, and the central angle is about 180 °.
Does not need to be extended along the arc.

Further, in the above-described embodiment, the boundary line L between the first and second areas 5a and 5b is a boundary line between the portion where the toner image is formed and the portion where the toner image is not formed on the recording paper 50. Although it is described that they substantially match, the straight line L does not need to substantially exactly match the boundary line between the portion where the toner image is formed and the portion where the toner image is not formed. Transfer roller 5
In the first area 5a of the recording paper 50, which comes into contact with the portion on which the toner image is formed, must always have a dielectric layer, but the second area 5b has abrasion resistance at least in a portion where abrasion occurs. It suffices that a coating layer made of a conductive material is provided.

[0025]

According to the present invention, a region of the transfer roller, which is in contact with a portion of the recording paper on which the toner image is not formed, is provided with a coating layer formed of a material having higher abrasion resistance than the dielectric material. Therefore, when a thick recording paper is used, it is possible to prevent the transfer roller from being worn by the recording paper and shortening its life.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a magnetic printing apparatus.

FIG. 2 is a schematic front view of the transfer paper peeling / conveying device according to the embodiment of the present invention as viewed in the direction of arrow 2-2 in FIG.

3 is an enlarged view of a portion III of FIG. 1, and is a schematic side view of the transfer paper peeling and conveying device according to the embodiment of the present invention as viewed in the direction of arrow line 3-3 in FIG.

FIG. 4 is a schematic plan view of the transfer paper peeling / conveying device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic drum 5 ... Transfer roller 5a ... 1st area | region of transfer roller 5b ... 2nd area of transfer roller 10 ... Transfer paper peeling conveyance device 12 ... Release belt 50 ... Recording paper

Claims (2)

[Claims] 1. A latent image formed on a rotatably cylindrical recording medium (1) is visualized with toner, and then the toner image is transferred onto a recording paper (50) while the recording is performed. In a transfer paper peeling and conveying device (10) for separating and transferring a recording paper (50) having a toner image transferred from the medium (1), a nip is formed between the recording paper and the recording medium (1), The transfer roller (5) provided so as to press the recording medium (1) onto the recording medium (1), and the transfer roller (5) are stretched so as to come into contact with the outer peripheral surface near one end of the transfer roller (5). A peeling belt (1) that is introduced into the nip together with the paper (50) and holds one side edge of the recording paper (50) between the transfer roller (5).
2) a peeling belt (12) for peeling the recording paper (50) from the recording medium (1) when discharged from the nip together with the recording paper (50), ) Is more abrasion resistant than the dielectric material in the first area (5a) having a coating layer formed of a dielectric material on the outer peripheral surface thereof and in the outer peripheral surface area in contact with the peeling belt (12). A transfer paper peeling / conveying device (10) having a second region (5b) provided with a coating layer formed of a material having high wear resistance. 2. The transfer paper peeling / conveying device (10) according to claim 1, wherein the second coating layer (5b) is a wear-resistant thin film.