JPH0727163Y2 - Paper stripping device - Google Patents

Description

[Detailed Description of the Invention] [Outline] The present invention relates to an electrophotographic apparatus, and more particularly, to a paper peeling device for peeling and adhering paper adhered to an image carrier With the aim of being able to convey well, let multiple nozzles face the paper attached to the image carrier,
By making the nozzle a negative pressure, the paper is separated from the image carrier,
In a paper peeling device that conveys a sheet by an endless belt arranged in parallel with the surface of the nozzle facing the image carrier, the distance from the image carrier of the surface of the nozzle facing the image carrier to the direction in which the paper is conveyed. The side edges are one step larger.

[Industrial application field]

The present invention relates to an electrophotographic apparatus, and more particularly to a sheet peeling apparatus that peels and conveys a sheet attached to an image carrier.

[Conventional technology]

As shown in the schematic view of FIG. 2, in the electrophotographic apparatus 1 to which the present invention is applied, the paper 2 is fed from the hopper 3,
For example, the image is conveyed to a recording section including an image carrier (hereinafter referred to as a photosensitive drum) 6 such as a photosensitive drum and a transfer corona discharger 7.

The photosensitive drum 6 is designed to rotate only in the direction of arrow A, and its surface is uniformly charged by corona discharge of the charger 4 in a dark place. Is attenuated to form an electrostatic latent image on the surface of the photosensitive drum 6.

After that, the developing device 9 electrostatically adsorbs the colored toner having a charge opposite in polarity to the latent image to the latent image, and the corona discharger 7 for transfer electrostatically transfers it to the sheet 2 charged in the opposite polarity.

The post-transfer sheet 2 is adsorbed by a nozzle 11 of a sheet exfoliation device 10 to be described later to be exfoliated from the photosensitive drum 6, and adsorbed by an adsorption belt 12 having a large number of adsorption holes, for example, a fixing unit including a heat roller or the like. It is sent to No. 8 and heated and fixed.

After fixing, the sheets 2 are stacked on the stacker 5.

After that, the charge on the photosensitive drum 6 is discharged by the static eliminator 13.

Then, the color toner 15 remaining on the photosensitive drum 6 is cleaned by the cleaning roller 14 and is collected in the toner storage section 16 to prepare for the next recording.

The above-described sheet peeling device 10 has a plurality of nozzles 11 facing each other in the axial direction of the photosensitive drum 6 as shown in the arrow B of FIG. 2 shown in FIG. 6 is connected to an exhaust blind hole 18 which is parallel to the shaft 6.

The exhaust blind hole 18 has a structure in which an exhaust pipe 19 is connected to an exhaust port 18a, and a vacuum pump (not shown) connected to the exhaust pipe 19 sucks air from the nozzle 11 through the exhaust blind hole 18. ing.

Due to this suction, the surface of the nozzle 11 becomes a negative pressure, and the paper 2 attached to the photosensitive drum is sucked and separated.

The peeled sheet 2 has the opening surface 11 of the nozzle 11 as described above.
It is adsorbed by an endless belt-shaped adsorption belt 12 arranged in parallel on the same surface as a, and conveyed to the fixing unit 8 by rotation of the belt.

[Problems to be solved by the device]

As described above, the sheet is sucked by the nozzle of the sheet peeling device and peeled from the photosensitive drum and is conveyed to a predetermined position by the belt. There is a problem in that it gets in and gets caught in the nozzle, which causes a transport failure.

An object of the present invention is to allow a sheet to be uniformly peeled from a photosensitive drum and accurately conveyed.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, as shown in the side view of FIG. 1 (a), from the photosensitive drum 6 of the surface of the nozzle 21 facing the image carrier (hereinafter referred to as the photosensitive drum facing surface) 22. Is one step larger on the side edge 21a side of the sheet 2 in the transport direction than on the downstream side edge of the sheet 2 in the transport direction.

[Action]

The side end of the nozzle facing surface of the photosensitive drum in the sheet conveying direction is
Because of the step height, the sheet sucked into the nozzle escapes due to the step and is conveyed by the belt without being caught.

〔Example〕

 FIG. 1 shows an embodiment of the present invention.

The same portions are denoted by the same reference numerals throughout the drawings.

The paper stripping device of the present invention has a nozzle as shown in the side view of FIG. 1 (a) and the view of arrow C in FIG. 1 (a).
The height from the photosensitive drum 6 of the photosensitive drum facing surface 22 of 21,
The height is one step higher at the side end 21a of the sheet 2 in the transport direction.

That is, as shown in FIG. 4A, a step H is provided at a side end 21a of the nozzle 21 in the sheet conveying direction, and the step H is opened laterally.

Therefore, the leading end 2a of the sheet 2 which is sucked by the nozzle 21 and enters the nozzle 21 and rises as shown in the drawing can be escaped due to the step H, so that it is not caught even when being conveyed by the suction belt 12. Lost.

Then, as in the prior art, the suction belt 12 is provided in parallel with the surface 22 of the nozzle 21 facing the photosensitive drum, and is accurately conveyed to a predetermined position, for example, the fixing unit.

Further, by appropriately setting the height of the step H, the opening area of the nozzle 21 is widened, or the suction pressure is increased to increase the suction force, and even if the leading edge of the sheet 2 enters the nozzle 21, the sheet 2 Does not get caught.

Therefore, it is possible to increase the suction pressure of the nozzle 21,
The peelability of the paper 2 from the photosensitive drum 6 can be improved.

[Effect of device]

By applying the paper peeling device of the present invention to the electrophotographic device, the paper peeled from the photosensitive drum can be accurately conveyed by the suction belt without being caught by the nozzle, which is a great industrial problem. Produce an effect.

[Brief description of drawings]

FIG. 1 (a) is a side view of the paper peeling device of the present invention, FIG. 1 (b) is a view taken in the direction of arrow C of FIG. 1 (a), and FIG. 2 is an outline of an electrophotographic device to which the present invention is applied. 3 and FIG. 3 are views taken in the direction of arrow B in FIG. In the figure, 1 is an electrophotographic device, 2 is a paper, 2a is a paper leading end, 6 is a photosensitive drum, 10 is a paper peeling device, 11, 21 are nozzles, 12 is a suction belt, 21a is a side end, 22 Is the surface facing the photosensitive drum.

Claims (1)

[Scope of utility model registration request] 1. A sheet (2) adhered to an image carrier (6) is made to face a plurality of nozzles (21), and a negative pressure is applied to the nozzle (21) so that the sheet (2) is carried on the image carrier. In the paper peeling device, which peels from the body (6) and conveys the paper (2) with an endless belt (12) arranged in parallel with the surface (22) of the nozzle (21) facing the image carrier, The distance between the image bearing member facing surface (22) of the nozzle (21) and the image bearing member (6) is set such that the side end portion (21a) side of the sheet (2) in the feeding direction is fed by the sheet (2). A sheet peeling device, which is one step larger than an end side on the downstream side in the transport direction.