JPH0477914B2 - - 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 lower part of the cleaning device c, and the distal end is attached to the surface of the photosensitive drum a by its own weight or a spring. It is installed in contact with the In order to avoid damaging the surface of the photosensitive drum a, a type is also used that is equipped with a retract mechanism (not shown) so that the tip of the peeling claw e comes into contact with the surface of the photosensitive drum a only when necessary. .

[Problems to be Solved by the Invention] However, in the conventional paper peeling device of this type, when attaching the peeling claw e, the bracket d is first screwed to the lower side of the cleaning device c, and the bearing portion f is After installing the main body of the peeling claw e through the support shaft g of the peeling claw e, connect this support shaft g to the E
Since various steps are required, such as fixing with a ring h, there is a problem that the installation work is troublesome and takes a long time, and the cost is also relatively high because there are many parts. Furthermore, since the bearing part f of the bracket d protrudes downward,
This has the problem that the space below the cleaning device c becomes narrow.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and its object is to facilitate the installation and replacement of the above-mentioned peeling claws, and to reduce the number of parts of the mounting member. To provide a low-cost paper peeling device that has fewer parts and can expand the space below the cleaning device.

That is, in the present invention, a peeling claw is provided on the lower side of a cleaning device for cleaning the surface of the photoreceptor,
Its proximal end is rotatably supported by a support shaft provided with a concave groove on the outer circumferential surface of the shaft for removing foreign matter such as toner through a bush, and its tip end is brought into contact with the surface of the photoreceptor to be exposed to light. In the paper peeling device for peeling paper from a body, the cleaning device includes a first supporting portion extending downward and having a notch at a lower end on the photoreceptor side, and a first supporting portion made of an elastically deformable material. a second support part that presses and holds the spindle of the peeling claw against the notch of the support part; the position of the second support part is shifted in the axial direction so that the second support part is located inside the first support part; The first supporting part and the second supporting part sandwich the supporting shaft of the peeling claw, and the position of the peeling claw with respect to the axial direction of the bush is fixed by the second supporting part. be.

[Operation] The present invention operates as follows. That is, in the paper peeling device of the present invention, the support shaft of the peeling claw is simply pushed between the first support part and the elastically deformable second support part, and the support shaft is moved to the second support part by the second support part. Since it is pressed and held in the notch of one support part, the installation work is significantly simplified. In addition, members such as an E-ring are not required, so costs can be reduced, and the space below the cleaning device can be expanded.

[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 plates that are vertically disposed vertically at appropriate intervals in the axial direction of the support shaft 5 on the lower surface 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 is connected to each of the above-mentioned support pieces 3, 3, 4, 4.
It is supported in four places to hold it firmly and reliably. Further, as shown in FIG. 2, in this device, second support parts 4, 4, which are arranged inside the first support parts 3, 3, are provided near both ends of the bush 6 of the peeling claw 7. As a result, the position of the bush 6 in the direction of the support shaft is fixed.

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. In addition, by appropriately selecting the material of the second support piece 4 to increase the pressing force on the first support piece 3, the flange portion 10
The formation of the stopper member 11 can be omitted, and the support shaft 5 may have a smaller diameter at both ends as shown in FIG. 7, or in some cases may have a straight cylindrical shape. It is possible to prevent the support shaft 5 from being pulled out. Further, a groove 12 is formed approximately in the center of the support shaft 5 along its outer circumferential surface for removing foreign matter such as toner that has entered between the bush 6 and the support shaft 5. If the stopper member 11 is removed, the support shaft 5 can be slid in the axial direction while being held between the first and second support parts, so that foreign matter such as toner accumulated in the groove 12 can be removed. When removing it, the groove 12 can be cleaned by sliding the support shaft 5 in the axial direction to expose the groove 12.

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 member is formed at the tip of the holding member 13 and comes into contact with the surface of the photosensitive drum 1. It consists of 14. That is, the holding member 13 is made of a strong material such as ABS resin or polycarbonate resin, and has a third material in the middle thereof.
As shown in the figure, the bush 6 that fits onto the support shaft 5 is provided in a protruding manner. The fitting gap between the bush 6 of this holding member 13 and the support shaft 5 is 50 μm.
A range of 70 μm is preferred. 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, or vibrations of the photosensitive drum 1 or the cleaning device 2 may be picked up and the contact with the photosensitive drum 1 may become unstable. This is because the peeling performance deteriorates over time.

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.

Holding member 13 of the peeling claw 7 configured in this way
As shown in FIGS. 1 and 2, a weight 15 for applying a load is attached to the end opposite to the peeling claw member 14.
is integrally embedded, and this weight 15
Due to the weight balance, 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, the support shaft 5 of the peeling claw 7 is supported by the first support pieces 3, 3 and the second support pieces 4, 4 provided on the lower surface side of the cleaning device 2. Since it is snap-fitted into the formed bearing portion 9 and held firmly and reliably, the installation and replacement work of the peeling claw 7 is significantly simplified compared to the conventional method.

Moreover, the first and second support pieces 3, 3, 4,
4 has a simpler structure than conventional mounting members such as brackets and does not require members such as E-rings, which reduces manufacturing costs and allows for more space on the bottom side of the cleaning device 2. Become.

[Effects of the Invention] As described above, the paper peeling device of the present invention has a configuration in which the spindle of the peeling claw is held between the first and second support portions provided on the bottom side of the cleaning device, so that the attachment of the peeling claw is difficult. In addition, it has the effect of significantly simplifying the replacement work, reduces the number of parts for the mounting member, expands the space below the cleaning device, and has the effect of reducing its manufacturing cost.

In addition, in the device of the present invention, since the support shaft having a groove for removing foreign matter on the outer peripheral surface of the shaft is held between the first support part and the second support part, cleaning of the groove is necessary. When cleaning, the grooves can be easily cleaned by sliding the support shaft in the axial direction while being held between the supporting parts to expose the grooves without removing the peeling claws.
Moreover, since the second support part is arranged inside the first support part, when the support shaft is slid when cleaning the groove, one end of the support shaft is engaged with the first support part. Even if the spindle comes out of the lock, it will not come off because it is supported by the three-point support of the remaining first support part and the two second support parts, and after cleaning, the spindle can be slid back to its original position. When returning to the original position, the second support part serves as a guide for determining the sliding direction, making it easy to slide the support shaft back to its original position.

[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.
A partially enlarged view of the figure, FIG. 6 is a plan view showing the spindle of the present invention, FIG. 7 is a plan view of the spindle according to a modification, and FIG. 8 is a plan view showing a conventional paper peeling device. The explanatory drawing and FIG. 9 each show 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)

[Scope of Claims] 1. A peeling claw is provided on the lower side of a cleaning device for cleaning the surface of the photoreceptor, and a concave groove is formed on the outer circumference of the shaft to remove foreign matter such as toner through a bush on the base end side of the peeling claw. In a paper peeling device that is rotatably supported on a support shaft provided on a surface and that peels paper from the photoconductor by bringing its tip side into contact with the surface of the photoconductor, the cleaning device includes a paper stripping device that extends downward from the cleaning device. a first support part having a notch at the lower end on the photoreceptor side; and a second support part made of an elastically deformable material and presses and holds the spindle of the peeling claw against the notch of the first support part. and are arranged and formed by shifting their positions in the axial direction so that the second support part is inside the first support part, and the supporting shaft of the peeling claw is held between the first support part and the second support part. A paper peeling device characterized in that the position of the peeling claw with respect to the axial direction of the bush is fixed by a second support portion. 2. At least one of the first support part and the second support part is comprised of a set of support pieces hanging downward at appropriate intervals on the lower side of the cleaning device. A paper peeling device according to claim 1.