JPS6243185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet-like photoreceptor used in an electrophotographic copying machine.

In an electrophotographic copying machine having a so-called photoreceptor drum in which a single sheet-like photoreceptor is wound around the drum circumferential surface, an electrostatic latent image is formed on the surface of the sheet-like photoreceptor, and this electrostatic latent image is formed on the surface of the sheet-like photoreceptor. The image is visualized by a developing device, this visible image is transferred to a transfer paper that moves while contacting the photoreceptor, and this transferred image is fixed by a fixing device. It is now possible to obtain multiple photocopies.

By the way, as a means for winding and fixing the above-mentioned sheet-like photoreceptor around the circumferential surface of the drum, the leading end of the photoreceptor is clamped at a predetermined position on the circumferential surface of the drum, and adhesive is applied to the rear end of the back surface of the photoreceptor. However, a method has already been proposed in which the rear end is directly adhered to a part of the circumferential surface of the drum via an adhesive, but when using a sheet-like photoreceptor configured in this way, However, it has the following drawbacks.

In other words, when the photoreceptor deteriorates due to repeated copying, it becomes difficult to perform the copying function and needs to be replaced. The rear end of the adhered photoreceptor must be peeled off from the circumferential surface of the drum, which is very troublesome to replace, and furthermore, the circumferential surface of the drum is stained with residual adhesive. In addition, the adhesion method is adhesive,
Since this is done in relation to a drum made of a different metal, there is a drawback that the adhesive strength decreases over time.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an electrophotographic copying machine that can be easily replaced with a drum and that can be wrapped around the drum in a tensioned state so as not to loosen the drum. An object of the present invention is to provide a sheet-like photoreceptor.

The present invention will be explained below with reference to illustrated embodiments.
That is, FIGS. 1 and 2 show a sheet-like photoreceptor according to an embodiment of the present invention. In the figure,
A latex-based or vinyl acetate-based adhesive _S1 is applied to the tip end side of the surface of the sheet-like photoreceptor 1 on which the so-called photoconductive layer is formed, that is, the front surface 1a on which the electrostatic latent image is formed. It is applied across the width of the photoreceptor. Further, at the rear end of the back surface 1b of the photoreceptor 1,
An adhesive S ₂ made of the same material as the adhesive S ₁ is applied. Note that this adhesive S ₂ may be of a different type as long as it comes into contact with the adhesive S ₁ at the rear end described above, that is, it is self-adhesive. I do not care.

By the way, the above-mentioned latex-based or vinyl oxide-based adhesives have excellent adhesive properties, so to speak, self-adhesion when they are brought into contact with each other. It has the property of being difficult to adhere to. Furthermore, latex-based adhesives and the like have an excellent adhesive effect on photoreceptors made of paper, for example. Therefore, any adhesive that has such characteristics, that is, an adhesive that has an adhesive effect only on a specific material such as a photoreceptor, and has excellent self-adhesion as described above, is suitable. I don't mind. Note that the effects of using such an adhesive will be described later.

By configuring the sheet-like photoreceptor as described above, it is possible to properly wrap and fix the photoreceptor around the circumferential surface of the drum 2 as shown in FIG. 3A without causing any slack or wrinkles. . That is,
For example, as shown in FIG. 2, a plurality of guide holes 1c are provided at the tip of the photoreceptor 1. Also, Figure 3a
As shown in FIG.
, and on the inclined wall 2b in this recess 2a,
A plurality of pins 3 are installed along the axial direction of the drum 2. Furthermore, the pin 3 is fitted into a hole 5a (see FIG. 3b) provided at the free end of the clamp lever 5, which is swingable with respect to the shaft 4.

As shown in FIG. 3b, the clamp lever 5 of the drum 2 configured in this way is rotated to the left against the elasticity of the spring 6 to open it, and the guide hole 1c of the photoreceptor 1 is pinned. 3. and,
As shown in FIG. 3c, the tip of the photoreceptor 1 is clamped by the pin 3 and the clamp lever 5, and in this state, the drum 2 is rotated in the direction of the arrow. Furthermore, while rotating the drum 2 and applying appropriate tension to the photoreceptor ₁ , as shown in FIG. Agent S ₁
and adhere to each other.

As described above, the sheet-like photoreceptor 1 is wound and set around the drum 2, but in this case, since the front and rear ends of the photoreceptor are bonded to each other with adhesive, they can be bonded by themselves. It has the property of self-adhesiveness, and there is no risk of decrease in adhesive strength. Therefore, the photoreceptor remains properly tensioned against the drum for a long period of time. Note that when the above-mentioned photoreceptor deteriorates and the copying function cannot be maintained, the photoreceptor must be removed. In this case, as shown in FIG. The indicated portion may be cut using an appropriate cutter. By opening the clamp lever 5 and removing the tip of the photoreceptor 1 from the pin 3, the photoreceptor can be easily removed from the circumferential surface of the drum 2. On the other hand, in the conventional example, the adhesive was directly attached to the drum circumferential surface, which required the work of peeling off the photoreceptor, but when the sheet-like photoreceptor of the present invention is used, This is not necessary, and there is no risk of staining the peripheral surface of the photoreceptor with residual adhesive. Furthermore, the length of the photoreceptor 1 may be set by taking into consideration the diameter of the drum 2 and the length of the bonded part, and in this case, even if there is some variation in the length of the photoreceptor, There is no problem.

By the way, FIG. 4 shows a sheet-like photoreceptor 7 in which perforations 7a are formed on the rear end side. That is, as shown in FIG. 3a, this perforation 7a is provided in a portion of the photoreceptor 1 corresponding to the recess 2a of the drum 2, that is, in an area where an electrostatic latent image is not formed (details will be described later). There is no problem with the formation function. As shown in FIG. 5, notches 7 are provided at both left and right ends of the photoreceptor 7 instead of perforations.
b, 7b may be provided. By providing such a breaking portion such as a perforation or a notch, the photoreceptor can be easily cut at this portion, and the work of replacing the photoreceptor can be further simplified.

By the way, the apparatus shown in FIG. 6 is designed to further automate the work of attaching and detaching the photoreceptor to the drum as described above. That is, in the figure,
A clamp lever 10, which is given left-handed rotation by a spring 9, is pivotally connected to the end wall (not shown) of the drum 2 by a shaft 11, and a plurality of clamp levers are attached to the end of one arm 10a of the lever 10. A book pin 12 is planted. These pins 12 pass through the inclined wall 2b corresponding to the recess 2a of the drum 2. As shown in FIG. 7, a guide plate 13 is fixed to the bottom of the recess 2a of the drum 2, and this rising portion 13a
A plurality of small holes 13b are bored in the hole, and the pin 12 described above is loosely fitted into the small holes 13b.

A cut lever 15 is provided above the recess 2a of the drum 2 and is pivotally connected to a side frame (not shown) by a shaft 14.
A long cutter portion 15a is formed in the axial direction of the drum 2. A pressure roller 18 is disposed to the left of the cut lever 15 and near the drum circumferential surface.
This roller 18 is configured to be able to freely approach and separate from the peripheral surface of the drum 2, and is connected to a one-way rotating clutch 18.
It is equipped with a. Note that the reference numeral 21 indicates a scraper for discharging the photoreceptor.

Here, in FIG. 6, when winding and setting a new sheet-like photoreceptor around the drum circumferential surface, the clamp lever 10 is first moved around the shaft 11 by the spring 9.
The pin 12 is rotated to the right against the elastic force of the drum, and the pin 12 is drawn into the inclined wall 2b of the drum. In this state, photoreceptor 1
Insert the tip of the guide plate 13 into the gap formed by the rising part 13a and the inclined wall 2b, and
While returning the clamp lever 10 to its original position, the pin 12 is engaged with the guide hole 1c of the photoreceptor 1. Further, the pressure roller 18 is brought into contact with the circumferential surface of the drum 2 with a predetermined pressing force. In this state, as shown in FIG. 8, the drum 2 is rotated in the direction of the arrow. In this case, the pressure roller 18 is kept in a non-rotating state by the action of the one-way rotating clutch 18a, and presses the photoreceptor 1 while applying braking to the drum. That is, the photoreceptor 1 is wound around the circumferential surface of the drum 2 in a stretched state so as not to wrinkle or loosen.

Then, as shown in FIG. 9, with the drum 2 rotated approximately 1 1/8 times from its original position (FIG. 6), the adhesive S ₂ on the rear end side of the back surface of the photoreceptor 1 and the front The adhesive _S1 on the tip side of the surface is bonded to each other by the pressing force of the pressure roller 18. In this state, the photoreceptor 1 is wound and set around the circumferential surface of the drum. Note that after this, the pressure roller 18 is kept separated from the drum circumferential surface.
In this way, since the front and rear ends of the photoreceptor 1 are firmly bonded with the adhesive, the stretched state of the photoreceptor 1 can be maintained for a long period of time.

Next, when removing the photoreceptor 1, the 10th
As shown in the figure, first, the pressure roller 18, which has been separated from the drum, is again brought into pressure contact with the circumferential surface of the drum, that is, the surface of the photoreceptor. Next, cut lever 15
is rotated clockwise around the shaft 14, and the rear end side of the sheet is cut by the cutter portion 15a. In this case, if the perforations 7a or notches 7b of the photoreceptor are cut by the cutter portion 15a as shown in FIGS. 4 and 5, this cutting operation can be easily performed. Can be done.

Then, as shown in FIG. 11, the scraper 21 for ejecting the photoreceptor is rotated counterclockwise around the shaft 20, and the tip 21a is moved into the recess 2a of the drum.
enter inside. In this state, the drum 2 is rotated in the direction of the arrow opposite to the previous direction, and the cut end on the rear end side of the photoreceptor 1 is guided by the scraper 21, and the photoreceptor is ejected from the machine. do. In this case, the pressure roller 18 is connected to the one-way rotating clutch 1
Since the function 8a rotates in the direction of the arrow following the rotation of the drum 2, there is no risk of interfering with the discharge operation. As shown in the figure, by rotating the clamp lever 10 clockwise around the shaft 11 to disengage the pin 12 from the guide hole 1c at the tip of the photoconductor 1, the tip is opened, and in this state, the photoreceptor 1 is in a state where it can be completely ejected.

In this way, the photoreceptor is removed from the circumferential surface of the drum, but in this case, as shown in FIG. Since the portion 7a (see FIG. 4) is cut off, the photoreceptor can be disposed of as a single sheet without producing scraps.

By the way, as shown in FIG. 12, the portion of the circumferential surface of the drum 2 corresponding to the angle θ is an area where no electrostatic latent image is formed, and this portion is located along the circumferential line A shown by the imaginary line. It is formed in a more retracted position than the original. The position of the adhesive portion B at the front and rear ends of the photoreceptor 1 is also set aside from the circumferential line A so as not to affect the copying function. Further, the electrostatic latent image described above is visualized, for example, by the developing device 22 located near a part of the peripheral surface of the drum 2, but in this case, the developing toner is In order to prevent the latent image from adhering to the non-latent image formation area side, the corner C of the peripheral wall of the drum 2 is formed in an R shape, and this part is retreated from the circumferential line A. In the figure, since the electrostatic latent image non-forming area of the drum 2 at an angle θ is formed in a flat shape away from the circumferential line A, the drum 2 rotates once. Every,
The toner accumulated in the toner accumulation section D is discharged. Therefore, toner does not accumulate excessively, and the influence on the developing function can be reduced.

By the way, FIG. 13 shows an example of a cutting mechanism that allows the photoreceptor to be cut more appropriately and easily as described above. That is, a part of the circumferential surface of the drum 23 is formed into a flat shape, and receiving parts 23a and 23b for cutting are provided in this part. Furthermore, an acute-angled notch 23c is provided between these.
form. Then, while entering the cutter portion 24a of the cut lever 24 into the notch 23c,
Cut the photoreceptor 1 as shown in the figure. Here, if the above-mentioned notch is formed as shown in FIG.
If the depth H of the notch is small and the width L of the top notch is large, it is not possible to change the distance for cutting to a large extent, and therefore it is difficult to cut. On the other hand, since the notch 23c shown in FIG. 13 has a large depth H and a small top notch width L, it is possible to change the distance for cutting to a large extent, making it easy to cut. . As shown in FIG. 15, by making the portion 23d of the peripheral surface of the drum 23 corresponding to the area where the electrostatic latent image is not formed into a flat shape as shown in the figure, the swinging lever 25 can be easily swung. Even when the pressure roller 18, which is configured to move toward and away from the drum circumferential surface depending on the operation, presses the flat portion 23d, there is no risk of wrinkling or loosening the photoreceptor. That is, if this portion is formed not in a flat shape but in an uneven shape, the above-mentioned wrinkles and slack are likely to occur, which may cause the photoreceptor to be misaligned.

As described above, according to the present invention, it is possible to provide a sheet-like photoreceptor for an electrophotographic copying machine that can be easily replaced with respect to a drum and that can be wound and set so as not to cause slack on the drum circumferential surface. .

[Brief explanation of the drawing]

FIG. 1 is a side view of a sheet-like photoreceptor according to an embodiment of the present invention, FIG. 2 is a perspective view of the sheet-like photoreceptor,
3a to 3d are front sectional views showing the operation up to winding the sheet-like photoreceptor around the drum, respectively;
FIG. 4 is a perspective view showing another embodiment of a sheet-like photoreceptor having perforations, and FIG. 5 is a partial perspective view showing an embodiment of a sheet-like photoreceptor having notches instead of the perforations. , FIG. 6 is a front sectional view showing an example of a mechanism for attaching and detaching a sheet-like photoreceptor to a drum, and FIG.
FIG. 8 is a perspective view of the drum, FIGS. 8 to 11 are front sectional views showing the desorption action of the sheet-like photoreceptor by the desorption mechanism, and FIG. 12 is a diagram for explaining the electrostatic latent image non-forming area. FIG. 13 is a front view showing an example of a cutting mechanism for a sheet-like photoreceptor; FIG. 14 is a main part of the cutting mechanism for explaining the cutting performance of a sheet-like photoreceptor. FIG. 15 is a front view showing the operating mode of a drum whose peripheral surface is partially formed into a flat shape and a pressure roller. 1, 7... Sheet-shaped photoreceptor, 2... Drum, 7
a, 7b...Broken portion, _S1 , _S2 ...Adhesive.

Claims (1)

[Scope of Claims] 1. Applying an adhesive that can be adsorbed only to the sheet-like photoreceptor to the tip of the surface on which an electrostatic latent image is to be formed of a sheet-like photoreceptor for an electrophotographic copying machine. In addition, an adhesive is applied to the rear end of the back surface of the sheet-like photoreceptor that can be adsorbed only to the sheet-like photoreceptor and can also adhere to the adhesive on the front end side. The leading end of the sheet-like photoreceptor is clamped to a clamp part of a drum, and after being wound around the circumferential surface of the drum, the rear end of the sheet-like photoreceptor is adhered to the leading end of the sheet-like photoreceptor. Characteristic sheet-like photoreceptor for electrophotographic copying machines. 2. An adhesive that can be adsorbed only to the sheet-like photoreceptor is applied to the leading end of the surface on which an electrostatic latent image is to be formed of a sheet-like photoreceptor for an electrophotographic copying machine, and the sheet-like photoreceptor is An adhesive that can be adsorbed only to the sheet-like photoreceptor and also adheres to the adhesive on the tip side is applied to the rear end of the back surface of the photoreceptor, and the adhesive is applied to the rear end of the sheet-like photoreceptor. After the portion is clamped to the clamp portion of the drum and wound around the circumferential surface of the drum, the rear end portion of the sheet-like photoreceptor is adhered to the tip portion of the sheet-like photoreceptor, and the tip portion of the sheet-like photoreceptor is A sheet-like photosensitive material for an electrophotographic copying machine, characterized in that a breaking part is provided in a side or rear end side of an area where an electrostatic latent image is not formed, so that the sheet-like photosensitive material can be easily cut. body.