JPH0631489Y2 - Paper stripping device for electrophotographic copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a paper peeling device of an electrophotographic copying machine, and more particularly to an improvement of a peeling member included in the paper peeling device.

[Problems to be solved by conventional technology and device]

In the electrophotographic copying machine, the mechanism for separating the paper from the photosensitive drum is as shown in FIG.
After the toner image on the photoconductor drum 1 is transferred to the paper P supplied by 2, one side of the paper is peeled from the photoconductor drum by the peeling claw 6 of the peeling member 5, and the next fixing step is performed by the guide roll 3. To be sent to. Here, the peeling claw 6 is formed by cutting out a part of an elastic metal thin plate to form a square tongue, and bending and raising this tongue to the side not contacting the photosensitive drum. Such a peeling member is provided along one side of the photosensitive drum along the cylindrical surface.
The upper end of the peeling member is connected to the main body of the copying machine via the bracket 9, and the lower end is connected to the elastic small piece 7 attached to the chute 4. The chute is provided with another elastic piece 8 to press the peeling member 5 against the photosensitive drum 1.

In such a paper peeling device, since the rigidity of the cutout portion of the peeling member 5 is small, the bending of the peeling member at this portion is large, and the adhesion to the photosensitive drum is not guaranteed, so that the peeling member 5 does not adhere to the paper. This will result in poor transfer of the toner image. Further, when the photoconductor drum is loaded into the copying machine, the chute 4 moves to bend the peeling member to separate it from the photoconductor drum, but at this time, the peeling member flexes unevenly. That is, since there is a large amount of bending in a portion having low rigidity and a small amount of bending in a portion having large rigidity, the peeling member may interfere with the photosensitive drum and be damaged.

[Means / actions for solving problems]

According to the present invention, the above-mentioned problem is solved in the sheet peeling device of an electrophotographic copying machine, which has a peeling member in which a side portion of an elastic rectangular metal thin plate is notched and a tongue is formed. A paper stripping device is characterized in that an auxiliary plate made of a spring steel plate having a size substantially equal to the size of the cutout is provided on the side of the tongue. Hereinafter, the present invention will be described in more detail with reference to FIG.

FIG. 1 (A) is a plan view of a peeling member according to the present invention.
FIG. 1 (B) is a side view. In FIG. 1 (A),
Ax on the right side of the peeling member 5 made of a thin spring steel plate or the like.
There is a notch having a size of b, and the peeling claw 6 is formed. According to the present invention, the spring steel plate auxiliary plate 10 is attached near the left side of the notch. The size of this auxiliary plate is preferably axb, which is substantially the same as the size of the notch, and its thickness is substantially the same as the thickness of the peeling member. The material of the auxiliary plate is a thin and flexible spring steel plate similar to the peeling member, and it is preferable to attach the auxiliary plate to the peeling member such as a double-sided tape that does not harden with time. As is clear from FIG. 1 (B), the peeling claw 6 is bent and bent in the reaction direction (to the left) on the side of the peeling member facing the photosensitive drum.

Next, a schematic structure of the copying machine when the paper peeling device of the present invention is used will be described.

As shown in FIG. 2, in the copying machine, around the photosensitive drum 60, according to a predetermined arrangement state,
Charging corotron 61, exposure lamp 62, light focusing optical system 6
3, developing device 64, transfer corotron 65, peeling device 6
6, a static eliminator 67 and a cleaning device 68 are provided.

Further, as a sheet conveying system, a timing is matched with a sheet feeding cassette 53 for accommodating sheets, a sheet feeding roller 54 for feeding the sheet 55 from the sheet feeding cassette 53, and a toner image formed on the photosensitive drum 60. Then, a timing roller 56 for sending the paper 55 toward the image transfer portion is provided.

Further, in order to fix the toner after peeling the sheet on which the toner image is transferred by the peeling device 66, a fixing device 52 is provided following the image transfer portion, and a discharge tray 57 is provided after the fixing device 52. There is.

In the copying machine configured as described above, the photosensitive drum 60 is rotated in the direction of arrow A, and its surface is uniformly charged by the charging corotron 61 before the image information is irradiated. Then, the image of the original document on the original table 59 is irradiated by the exposure lamp 62, and the reflected light of the image is irradiated on the surface of the photosensitive drum 60 via the light focusing optical system 63.
Thereby, an electrostatic latent image is formed. After that, the developing device 6
The electrostatic latent image is made visible by 4.

The visualized toner image is transferred to the paper 55 fed in time with the transfer image by the transfer corotron 6.
5, the transfer is carried out, the separation device 66 separates it from the surface of the photoconductor drum 60, and it is conveyed toward the fixing device 52.

Then, in the fixing device 52, the heating roller 50 fixes the ronner onto the sheet and discharges it onto the discharge tray 57.

Further, after the image is transferred, the toner remaining on the surface of the photoconductor drum 60 is removed of the residual charge by the static eliminator 67, and then cleaned by the blade 69 of the cleaning device 68, the rotating brush, or the like. It is then discharged by the screw conveyor 70 and is ready for the next copy cycle.

[Effect of device]

According to the present invention, since the auxiliary plate made of the Nibane steel plate in the vicinity of the cutout portion of the paper peeling member is attached, the rigidity of the peeling member becomes uniform and the peeling member is attached along the outer periphery of the drum when attached to the photosensitive drum. The peeling member can be brought into close contact with each other, and when the peeling member is separated from the photosensitive drum, the peeling member can be evenly bent to prevent interference with the drum, and transfer failure and damage to the peeling member can be eliminated. .

[Brief description of drawings]

1 (A) and 1 (B) are a plan view and a side view of a peeling member of the present invention, FIG. 2 is a schematic view of a copying machine, and FIG. 3 is a diagram for explaining a paper peeling mechanism. Reference numeral 1 in the figure ... Photosensitive drum, 2 ... Feed roll, 3
...... Guide roll, 4 ...... shoot, 5 …… Peeling member, 6
...... Peeling claws, 7,8 ... Small elastic pieces, 9 ... Brackets,
10 ... Spring steel plate auxiliary plate.

Claims (1)

[Scope of utility model registration request] 1. A sheet peeling device for an electrophotographic copying machine, comprising a peeling member having a tongue portion formed by notching a side portion of an elastic rectangular metal thin plate, and a lateral side of the tongue portion on the metal thin plate. A sheet peeling device, characterized in that an auxiliary plate made of a spring steel plate having a size substantially equal to the size of the cutout is provided in the.