JPH0477915B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a paper peeling device for peeling paper on which a toner image has been transferred from the surface of a photoreceptor, and in particular to a paper peeling device that uses a peeling claw as a peeling means. This relates to improvements in equipment.

[Prior Art] Conventional paper peeling devices include a device that forcibly peels paper from the surface of a photoreceptor using an appropriate suction means, and a so-called belt strip that forcibly presses and peels one end of the paper with a peeling belt or the like. A self-stripping device known as a self-stripping device, which is especially used in models that use a belt-shaped photoreceptor, or a device that forcibly peels off the paper using a peeling claw whose tip comes into contact with the surface of the photoreceptor. Are known.

However, although the device that uses the first suction means to peel off the material has excellent peeling performance, it is large and expensive, making it not very practical, so it is still only used in ultra-high-speed devices. Also, a device that uses a second peeling belt or the like to peel off the paper has excellent peeling performance like the first device, but since a toner image is no longer formed on one end of the paper that is in contact with the belt, copies cannot be made on the entire surface of the paper. When it stopped being used, there were negative effects. In addition, the third device called self-stop does not require special peeling means and is inexpensive, but it is inferior in terms of peelability, especially when the paper is thin such as second original drawing paper, and the peelability is extremely poor. When it decreased, there were negative effects.

On the other hand, the device that peels off the paper using the fourth peeling claw is relatively inexpensive compared to the first to third devices, and can copy the entire surface of the paper. It has been widely adopted because it has sufficient removability by appropriately selecting the attachment method and the like.

By the way, the above-mentioned device using this peeling claw is No. 8.
As shown in Figures 9 to 9, a transfer device b for toner transfer arranged around the photosensitive drum a rotating in the direction of the arrow, and a cleaning device c for cleaning the surface of the photosensitive drum a after toner transfer. The proximal end of the peeling claw e is rotatably supported on a bracket d provided at the bottom of the cleaning device c, and the distal end is supported by its own weight or a spring, etc., on the photosensitive drum a. 0.5gf to 3g to the surface
They are mounted in contact with each other with a pressing force of about f. In order to prevent the surface of the photosensitive drum a from being scratched, a type with a retract mechanism (not shown) or a solenoid ( (not shown) etc., move the peeling claw e to its supporting shaft g.
There is also a type in which the upper part is reciprocated along the axial direction and the contact positions on the photosensitive drum a are dispersed to minimize damage to the surface of the photosensitive drum a.

However, conventional paper peeling devices of this type
As mentioned above, since it is usually arranged below the cleaning device c where toner contamination is most likely to occur, toner falling from the cleaning device c and being scraped off from the surface of the photosensitive drum a by the peeling claw e are removed. When toner is applied to the above-mentioned support shaft g and bearing part f,
or adheres to the bush h etc. interposed between the peeling claw e and the support shaft g, and furthermore, the gap between the contact area between the bearing part f and the support shaft g and the contact area between the support shaft g and the bush h. This has the disadvantage that the gap narrows, causing failure in rotation of the support shaft g and the peeling claw e.

In particular, the gap between the support shaft g and the bushing h is adjusted to about several tens of μm to 150 μm in order to keep the pressing force of the peeling claw e against the photosensitive drum a and the parallelism of the contact portion constant. Therefore, when toner enters this gap, the peeling claw e immediately malfunctions, causing a change in the pressure contact force, which deteriorates the peeling performance and causes a paper jam.

Furthermore, if the tip of the peeling claw e stops at a position away from the photosensitive drum a, the peeling claw e will come into contact with the toner image forming surface of the paper i and scrape off a part of it, resulting in white on the copy image. It had the disadvantage of causing dropouts and black streaks, which significantly degraded the image quality.

Therefore, in order to eliminate the above-mentioned drawbacks,
Japanese Patent No. 95469 discloses a bearing device in which a bearing surface of a bearing part f of a support shaft g supporting the peeling claw e is provided with a relief part for letting foreign matter such as toner escape. According to this device, foreign matter such as toner that has entered the gap between the support shaft g and the bearing part f is collected in the relief part of the bearing surface, so that the gap is no longer clogged with foreign matter and the peeling claw e is This had the effect that the peeling performance did not deteriorate because the rotation was not hindered.

[Problems to be Solved by the Invention] However, even in this device, when this device is used for a long period of time, the relief portion formed on the bearing surface becomes filled with foreign matter such as toner. There was a problem that rotation of the peeling claw e was hindered.

For this reason, in the above device, it is necessary to periodically remove foreign matter such as toner accumulated in the relief part, and in this case, the relief part is inside the bearing part f and is not exposed, so Above support shaft g
I had to take it out and clean it.

Therefore, it is necessary to disassemble and reassemble the device each time the cleaning operation is performed, which poses a problem in that maintenance management becomes troublesome.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and its object is to improve the support shaft of the peeling claw and the bearing portion or bushing that slides on the support shaft. To provide a paper peeling device which prevents foreign matter such as toner from clogging the gap between the paper peeling member and a sliding member such as the paper peeling device, and which simplifies maintenance management and easily maintains peeling performance over a long period of time. It is in.

That is, in the present invention, a peeling claw is disposed near the photoreceptor, the proximal end of the peeling claw is rotatably supported, and the distal end thereof is brought into contact with the surface of the photoreceptor to peel the paper from the surface. In the paper peeling device,
Foreign matter such as toner that has entered the gap between the spindle and a sliding member that slides on the spindle along the outer circumferential direction of the spindle that supports the peeling claw is removed from the slide contact surface. In addition to forming a concave groove for
It is characterized in that the support shaft or the sliding contact member is provided so as to be movable in the axial direction so that the sliding contact position thereof is shifted.

[Operation] The present invention operates as follows. That is, in the paper peeling device of the present invention, foreign matter such as toner that has entered the gap between the spindle that supports the peeling claw and the sliding member that slides on the spindle is caused by the rotation of the spindle or the sliding member. As the toner is collected in the concave groove formed on the outer circumferential surface of the support shaft, the gap is not clogged with foreign matter such as toner, and the rotation of the peeling claw or its support shaft is unobstructed and peeling is completed. The tip of the claw can be brought into contact with the surface of the photoreceptor with a predetermined pressure.

Moreover, the groove formed in the support shaft can be exposed simply by moving the support shaft or the sliding contact member in the axial direction and shifting the contact position.
The cleaning work described above can be performed without disassembling the device, its maintenance and management is simplified, and stable peeling performance can be easily maintained over a long period of time.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 7, two sets of first support pieces 3, 3 and second support pieces 4, 4 are provided vertically downward on the lower side of the cleaning device 2, which is arranged opposite to the photosensitive drum 1. , a support shaft 5 held by these support pieces 3, 3, 4, 4, and a peeling claw 7 pivotally attached to the support shaft 5 via a bush 6.

First, the above-mentioned pair of first supporting pieces 3, 3 are shown in FIG.
As shown in FIG. 2, the cleaning device 2 is made up of a plate vertically installed at an appropriate interval in the axial direction of the support shaft 5 on the lower side of the cleaning device 2, and the lower end of the cleaning device 2 on the side of the photosensitive drum 1 side. An L-shaped notch 8 is formed in the portion.

On the other hand, the pair of second support pieces 4, 4 are made of an elastically deformable material such as plastic, and similarly to the first support piece 3, are provided on the lower surface side of the cleaning device 2 at intervals in the axial direction of the support shaft 5. It is installed vertically with
and its tip side is connected to the above-mentioned support shaft 5 as shown in FIG.
This tip, which is slightly bent to the side, and the notch 8 of the first support piece 3 form a bearing portion 9 . That is, the notch 8 and the tip of the second support piece 4 are arranged facing each other with an interval slightly narrower than the diameter of the support shaft 5, and the support shaft 5 is pushed into the bearing portion 9. At this time, the support shaft 5 is pressed against the notch 8 by the elastic force of the second support piece 4 and positioned, and is also held between the notch 8 and the second support piece 4 and fitted with a snap. There is.
As shown in FIG. 2, in this device, the first support pieces 3, 3 and the second support pieces 4, 4 are arranged with their positions shifted in the axial direction of the support shaft 5. , the support shaft 5 has the above-mentioned support pieces 3, 3, 4,
It is supported at four points (4) and held firmly and reliably.

The support shaft 5 that holds the peeling claw 7 is made of surface-finished stainless steel, and as shown in FIG. has flange part 1
A stopper member 11 is removably attached to the support shaft 5 in cooperation with the support shaft 5 to prevent accidental withdrawal of the support shaft 5.

A concave groove 12 is continuously formed approximately in the center of the support shaft 5 along its outer circumferential direction for removing foreign matter such as toner that has entered between the bush 6 and the support shaft 5. Furthermore, the width dimension l ₁ of the groove 12 is as follows:
It is preferable that the length _l2 of the bush 6 be as large as possible, and the non-contact area between the support shaft 5 and the bush 6 is larger than the contact area so that the frictional force therebetween is smaller. Further, the groove 12 does not necessarily need to be provided continuously, and the groove 12 is not necessarily provided continuously.
As shown in the figure, it may be formed at intermittent portions along the outer circumferential direction of the support shaft 5.

Further, the peeling claw 7 held on the spindle 5 has a first
As shown in FIGS. 3 to 3, a holding member 13 is rotatably pivoted to the support shaft 5, and a peeling claw formed at the tip of the holding member 13 and abuts against the surface of the photosensitive drum 1. It is composed of a member 14.
That is, the holding member 13 is made of a strong material such as ABS resin or polycarbonate resin, and the bushing 6 that fits into the support shaft 5 is provided in the middle part of the holding member 13, as shown in FIG. is installed protrudingly. The fitting gap between the bush 6 of this holding member 13 and the support shaft 5 is 50μ.
The range is preferably from m to 70 μm. The reason for this is that below this range, the fit between the support shaft 5 and the holding member 13 is too tight, and the rotation of the peeling claw 7 is likely to become defective due to slight external factors, while on the other hand, above this range If this happens, rattling may occur and the parallelism of the contact portion of the peeling claw 7 with the photosensitive drum 1 may be impaired.
This is because vibrations of the photosensitive drum 1 or the cleaning device 2 are picked up and contact with the photosensitive drum 1 becomes unstable, resulting in a decrease in peeling performance.

On the other hand, the peeling claw member 14 attached to the tip of the holding member 13 is made of metal such as stainless steel, polyamide-imide plastic, or hard rubber.
It is made of polyurethane rubber, etc. with a temperature of about 70 to 95 degrees. When the peeling claw member 14 is made of plastic, the holding member 13 and the peeling claw member 14 may be formed integrally.

Furthermore, as shown in FIGS. 1 and 2, a load applying weight 15 is integrally embedded in the holding member 13 of the peeling claw 7 at the end opposite to the peeling claw member 14. Due to the weight balance of the peeling claw member 15, the tip of the peeling claw member 14 is set to contact the photosensitive drum 1 with a pressing force of about 0.3 gf to 3 gf. If there is sufficient space below the cleaning device 2, the necessary applied pressure can be obtained by extending the holding member 13 from the support shaft 5 without providing the weight 15.

In the paper peeling device of the present invention configured as described above, even if foreign matter such as toner enters the gap between the spindle 5 that supports the peeling claw 7 and the bush 6 that slides in contact with the spindle 5, This foreign matter is collected in the groove 12 formed on the outer peripheral surface of the support shaft 5 as the bush 6 rotates, so that the gap is not clogged with foreign matter. Therefore, the rotation of the peeling claw 7 is not inhibited, so that the tip thereof can be brought into contact with the surface of the photosensitive drum 1 with a predetermined pressing force, and stable peeling performance is maintained.

Moreover, in this device, since the groove 12 formed in the support shaft 5 is exposed by moving the peeling claw 7 in the axial direction, foreign matter such as toner collected in the groove 12 can be easily removed. cleaning operations can be carried out without disassembling the device.

Furthermore, a peeling claw 7 is attached on the support shaft 5 along the axial direction.
By applying this device to a type in which the peeling claw 7 moves back and forth, foreign matter in the groove 12 is automatically removed every time the peeling claw 7 moves, so the cleaning work described above becomes unnecessary and its maintenance management becomes unnecessary. It can be further simplified.

In this embodiment, the support shaft 5 of the peeling claw 7 is snap-fitted into a bearing portion 9 formed by the first and second support pieces 3, 3, 4, and 4 provided on the lower surface side of the cleaning device 2. Since the contact area of the support shaft 5 in contact with the bearing part 9 is small, no groove is formed in this part, but if a conventional bracket is used instead of this structure, It is desirable to form a concave groove also on the outer circumferential surface of the support shaft 5 in contact with the bearing part.

[Effects of the Invention] As described above, in the paper peeling device of the present invention, since the concave groove is formed on the outer circumferential surface of the spindle that supports the stripping claw, toner that has entered the gap between the spindle and the sliding member is removed. and other foreign matter can be collected in the groove,
Foreign matter does not get stuck in the above gap. Therefore, since the rotation of the peeling claw etc. is not hindered, the tip thereof can be brought into contact with the surface of the photoreceptor with a predetermined pressing force, and the peeling performance can be maintained over a long period of time.

Moreover, since the groove is exposed simply by shifting the support shaft or sliding member in the axial direction, foreign matter accumulated in the groove can be easily removed, simplifying cleaning work and simplifying maintenance. It has the effect of making it easier.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention. FIG. 1 is a side view of the paper peeling device of the present invention, FIG. 2 is a bottom view of FIG. 1, and FIG. FIG. 4 is a plan view showing the main parts of the peeling claw, FIG. 4 is a side view showing the main parts of the first and second support pieces of the present invention, and FIG.
6 is a plan view showing the spindle of the present invention, FIGS. 7A and B are a plan view and a side view of the spindle according to a modified example, and FIG. 8 is a conventional FIG. 9 is an explanatory diagram showing the paper peeling device of the present invention, and FIG. 9 is a perspective view showing a method of attaching the peeling claw. [Description of symbols] 1... Photosensitive drum, 2... Cleaning device, 3... First support piece, 4... Second support piece, 5... Support shaft, 6... Bush, 7... Peeling claw, 8... Notch portion, 9... Bearing portion, 10... Flange portion, 11... Stopper member, 12... Concave groove, 13... Holding member, 14... Peeling claw member, 1
5... Weight.

Claims (1)

[Claims] 1. A peeling claw is disposed near the photoconductor, the proximal end of which is rotatably supported, and the distal end thereof is brought into contact with the surface of the photoconductor to remove the paper from the surface. In the paper peeling device, foreign matter such as toner is removed from the outer circumferential surface of the spindle that supports the peeling claw, which enters between the spindle and the sliding contact member that slides on the spindle along the outer circumferential direction of the spindle. A paper peeling device, characterized in that a concave groove is formed for removing paper from the sliding contact surface thereof, and the support shaft or the sliding contact member is provided so as to be movable in the axial direction so that the sliding contact position thereof is shifted. 2. The paper peeling device according to claim 1, wherein the groove portion is a groove continuously formed along the outer circumferential direction of the support shaft. 3. The paper peeling device according to claim 1, wherein the groove portion is a groove formed intermittently along the outer circumferential direction of the support shaft. 4. The paper peeling device according to claim 1, wherein the groove is formed so that a non-contact area is larger than a contact area between the support shaft and the sliding member.