JPH04155369A - Image forming device - Google Patents

Abstract

PURPOSE:To separate a printing paper attached to an image forming body securely by contacting the tip of a separating claw to the image forming surface of the image forming body opposite to the moving direction of a printing medium. CONSTITUTION:When a paper 20a on which the toner image of a sensitive drum 51a is copied is not separated by an air adsorption roller 13, and the tip of a separating claw 15a comes to the position contacting to the sensitive surface of the drum 51a, a small clearance is generated between the front end of the paper 20a and the sensitive surface by the bending of the sensitive surface and the elasticity of the paper 20a, and the front end of the paper 20a is separated from the sensitive surface by the separating claw 15a. In this case, a toner 10a remaining on the sensitive surface is rubbed by the tip of the separating claw 15a and dropped down, but since the air is absorbed by a vacuum pump 9b, the dropping toner 10a is absorbed through a clearance between an installing member 16c and the separating claw 15a, and collected through an absorption duct 16b and a rubber pipe 16a. As a result, the dropping tone 10a is not dropped on the paper 20a but collected. The separated paper 20a is delivered to a fixation unit 58 by a belt mechanism 11, and fixed and delivered.

Description

[Detailed Description of the Invention] [Summary] A separation claw formed of a resin material is attached to the tip of a conduit connected to an air suction means, and the printing paper is separated by bringing the separation claw into contact with the surface of the image forming body. The purpose of the present invention is to provide an image forming apparatus that can reliably separate printing paper attached to an image forming body, and to develop an electrostatic image formed on an image forming body with toner. , the waste toner is transferred and fixed onto a printing medium, the waste toner remaining on the image forming body is removed by the toner removing means in a cleaner section having a toner removing means and a first air suction means, and the waste toner is sucked by the first air suction means. The image forming device is an image forming device that collects a print medium attached to the image forming surface of an image forming body, and includes a separating claw whose tip contacts the image forming surface and a separating claw installed inside the tip so as to face the moving direction of the printing medium attached to the image forming surface of the image forming body. This configuration includes a conduit with a duct and a second air suction means connected to the rear end of the conduit.

[Industrial application field]

The present invention relates to an image forming apparatus such as an electrophotographic printing apparatus used in a copying machine, a printer, a facsimile machine, etc., and more particularly, the present invention relates to an image forming apparatus such as an electrophotographic printing apparatus used in a copying machine, a printer, a facsimile machine, etc. The present invention relates to an image forming apparatus that can separate printing paper by bringing attachment and separation claws into contact with the surface of an image forming body.

2. Description of the Related Art Recently, with the rapid spread of office automation equipment, electrophotographic printing devices are becoming widely used in copying machines, printers, facsimile machines, and the like.

In this device, after the toner image developed on the photosensitive drum is transferred to the printing paper, it is difficult to separate the printing paper from the surface of the photosensitive drum, so a method is used in which the printing paper is separated from the back side of the printing paper using an air suction row. The paper may not be separated even if the paper is separated, resulting in paper jams, and sometimes the cleaner, charger, or
Since this may extend to the optical unit developing device and cause damage to these units, a method that can completely separate the printing paper is desired.

[Conventional technology]

FIG. 3 illustrates an internal side view of the electrophotographic printing apparatus. In the figure, 1 is a cassette mounting part, 2 is a cassette, and 3 is a cassette mounting part.
4 is a feeding roller, 4 is a conveyance path, 5 is a printer section, and 6 is a stacker.

The printer 5 includes an optical unit 50. Photosensitive drum 51a.

Cleaner section 52a, charger 53. Developing device 54. Pre-transfer static eliminator 55, transfer device 56. Static eliminator 57. and a fixing device 58.

A cassette 2 is set in the cassette loading section 1, and the cassette 2 contains printing paper (hereinafter referred to as paper) 20 of a desired size.
A is accumulated and stored.

With this configuration, when the power of the apparatus is turned on, the fixing section 58 is heated to a predetermined temperature and becomes ready for printing, and then the paper 20a is fed out from the cassette 2 in the direction of arrow A based on the print instruction signal, and the paper 20a is fed out to the conveying path 4. is transported to the photosensitive drum 5.
Send it below 1a. By this time, the photosensitive drum 51a has been neutralized by the static eliminator 57, the residual toner 10a has been cleaned by the cleaner section 52a, and the charger 51a has been cleaned again.
is charged with electricity.

Light data irradiated from an optical unit 50 constituted by a laser light source or the like is scanned onto a photosensitive drum 51a, and the electrostatic image formed on the photosensitive drum 51a is developed into a toner image by a developing device 54, and a pre-transfer static eliminator 55 and photosensitive drum 51
After lowering the surface potential of a, the image is transferred to the paper 20a by the transfer device 56, and then fixed by the fixing device 58, and the paper 20a is sent to the stacker 6.

Here, the cleaner section 52a is a brush? a, a discharge pipe 8 and a straight pump 9a that sucks air,
The toner 10a remaining on the photosensitive drum 61 is removed and dropped by the rotation of the brush 6a, and air is sucked by the vacuum pump 9a that is in operation while the apparatus is in operation, and the waste toner 10 is removed.
a is discharged through the discharge pipe 8 and collected in a toner collection box (not shown).

Further, the lower side of the conveyance path 4 between the transfer device 56 and the fixing device 58 is constituted by a belt mechanism 11, and the right end of the belt 12 is connected to the air suction roller 13 at a position where the transferred paper 20a is separated from the photosensitive drum 51a. It is hung.

The left end of the belt 12 is hung around a pulley P1. 14
indicates a tension roller. The air suction roller 13 has air holes radially provided on its outer periphery, and is connected from the inside to a vacuum pump (not shown).

Therefore, when the leading edge of the paper 20a reaches the right end of the belt mechanism 11, the paper 20a is attracted by the air suction roller 13, separated from the photosensitive drum 51a, and conveyed toward the fixing device 58.

[Problem to be solved by the invention]

According to the above conventional method, the paper onto which the toner image on the photosensitive drum has been transferred is made photosensitive by the effect of reducing the surface potential of the photosensitive drum by the pre-transfer static eliminator, the effect by the transfer device, and the peeling effect by air adsorption by the air adsorption roller. Although the paper is separated from the photosensitive drum, there are cases where the air suction roller cannot separate the paper attached to the photosensitive drum, and the paper remains wrapped around the photosensitive drum and moves to the cleaner, charger, and optical unit.

Alternatively, a jam may occur at a position such as a developing unit, making it difficult for an operator to remove it, and also causing damage to these units.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus that can reliably separate printing paper attached to an image forming body.

[Means to solve the problem]

FIG. 1 is a diagram showing the basic configuration of the present invention.

In the figure, 7 is a toner removing means, 9 is a first air suction means, 10 is a toner, 20 is a printing medium, 51 is an image forming body, and 15 is a printing medium 20 attached to the image forming surface of the image forming body 51.
16 is a guide tube with the separating claw 15 attached inside the tip, 17
is a second air suction means connected to the rear end of the guide tube 16.

Therefore, the printing medium 20 attached to the image forming surface of the image forming body 51
The structure is such that the parts are separated at the tip of the separating claw 15.

[Effect]

Since the tip of the separation claw 15 is in contact with the image forming surface of the image forming body 51 facing in the moving direction of the printing medium 20, the separation claw 1
The tip of the separation claw 15 easily separates the printing medium 20 from the image forming surface of the image forming body 51, and at this time, the tip of the separation claw 15 drops the toner lO remaining on the image forming body 51 into the guide tube 16. , the toner 10 is collected by suction by the second air suction means 17.

Therefore, the printing medium 20 is reliably separated from the image forming surface of the image forming body 51 by the separating claw 15, and the toner IO dropped by the separating claw 15 is collected without falling on the surface of the printing medium 20, so that the printing medium 20 surfaces will not get dirty.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the second Rikume σ hair interview. The same reference numerals refer to the same objects throughout the design.

FIG. 2 shows a configuration diagram in which the present invention is applied to the electrophotographic printing apparatus described in the conventional example.

Brush 7a, paper 20a and photosensitive drum 51a in FIG.
The toner removing means 7. of FIG. The vacuum pump 9b in FIG. 2 corresponds to the printing medium 20 and the image forming body 51, respectively, and the vacuum pump 9b in FIG. 2 corresponds to the first air suction means 9 and the second air suction means 17 in FIG. rubber tube 16a.

The suction duct 16b and the mounting portion 16c correspond to the guide pipe 16 in FIG.

As shown in the side view and enlarged view of main parts in FIGS. 2(a) and 2(b), a synthetic resin whose tip end elastically contacts the photosensitive surface of the photosensitive drum 51a between the air suction roller 13 and the cleaner section 52a. Separation claws 15a made of material are provided. The contact position is the longitudinal center of the photosensitive drum 51a.

The separation claw 15a is rotatably supported at one end by a spindle 160 inside the distal end of the mounting section 16c via a suction duct 16b fitted to the distal end of the rubber tube 16a. More exposed. A spring 150 is wound around the support shaft 160. Also, the installation is part 16.
A gap is provided between the separation claw 15a and the separation claw 15a through which air flows. 161 is backing.

162 indicates a rubber plate.

The rear end of the rubber tube 16a joins the rear end of the exhaust pipe 8 of the cleaner section 52a, and the exhaust pipe 8 is connected to the vacuum pump 9b. The vacuum pump 9b is in operation during operation of the device.

In addition, the mounting portion 16c and the belt mechanism 11 are supported by a support member and attached to movable plates (both the support member and the movable plate are not shown), and the movable plate is attached to the separating claw 15a.
The air suction roller 13 is configured to be movable by a predetermined distance in a direction away from the photosensitive surface of the photosensitive drum 51a.

With such a configuration, the paper 20a onto which the toner image on the photosensitive drum 51a has been transferred is transferred to the air suction roller 1.
When the tip of the separating claw 15a comes into contact with the photosensitive surface of the photosensitive drum 51a without being separated by the paper 20a, the tip of the paper 20a and the photosensitive surface are separated by the curvature of the photosensitive surface of the photosensitive drum 51a and the elasticity of the paper 20a. A slight gap is created between them, and the leading end of the paper 20a is separated from the photosensitive surface by the leading end of the separating claw 15a.

At this time, the toner 10a remaining on the photosensitive surface is removed from the separation claw 1.
The falling toner 10a is either rubbed by the tip of the toner 5a and falls, or the air is sucked by the vacuum pump 9b.
The gas is sucked in through the gap between the attached part 16c and the separating claw 15a, and is recovered via the suction duct 16b and the rubber tube 16a. Therefore, the fallen toner 10a is collected without falling onto the paper 2Oa.

The separated paper 20a is sent to the fixing device 58 by the belt mechanism 11, where it is fixed and sent out.

Further, when cleaning or replacing the photosensitive drum 51a, or removing a jam, the separation claw 15a and the air suction roller 13 can be retracted from the photosensitive surface of the photosensitive drum 51a by moving the movable plate.

In this way, the separating claw 15a is made of a synthetic resin material and does not scratch the photosensitive surface of the photosensitive drum 51a even if it is rubbed, and the separating claw 15a removes the paper 20a that has not been separated by the air suction roller 13. 15a ensures that
In addition, it is possible to separate the paper 20a without staining the paper 20a with the toner 10a.

Therefore, since the paper 20a is reliably separated, jams caused by poor separation of the paper 20a can be prevented, and the photosensitive drum 5
It is possible to prevent damage to each unit, such as a cleaner, a charger, an optical unit, and a developing device, arranged around 1a.

〔Effect of the invention〕

As explained above, according to the present invention, the printing medium adhering to the image forming surface of the image forming body is separated by the tip of the separating claw, and the residual toner dropped from the image forming surface of the image forming body by the separating claw is removed from the second toner. Since the toner can be sucked by the air suction means, the toner dropped by the separating claw is collected without falling onto the surface of the printing medium, and the surface of the printing medium is not stained.
The printing medium can be reliably separated from the image forming surface of the image forming body, and the occurrence of jams caused by poor separation of the printing medium can be significantly reduced, and damage to units arranged around the image forming body can be reduced. It has the effect of preventing

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention, FIG. 2 is a diagram illustrating an embodiment of the present invention, and FIG. 3 is an internal side view of a conventional electrophotographic printing apparatus. In the figure, 7 is a toner removing means, 7a is a brush, 9 is a first air suction means, 9a and 9b are vacuum pumps, 10.10a is a toner,
15. 15a is a separating claw, 16 is a guide tube, 16a is a rubber tube, 16b is a suction duct, 16c is a mounting section, 17 is a second air suction means, 51 is an image forming body, 51a is a photosensitive drum, 52, 52a indicates a cleaner section. $ Invention of Yodoe Structure A Figure 4I (α) 4FA11 view

Claims (1)

[Claims] 1) The electrostatic image formed on the image forming body (51) is transferred to the toner (1).
0), transferred and fixed onto a printing medium (20),
removing toner (10) remaining on the image forming body (51) by the toner removing means (7) in a cleaner section (52) having a toner removing means (7) and a first air suction means (9); An image forming device that sucks and collects air by the first air suction means (9), wherein the printing medium (
A separating claw (15) whose tip contacts the image forming surface and a guide tube (16) with the separating claw (15) attached inside the tip so as to face the moving direction of the separating claw (15).
); and a second air suction means (17) connected to the rear end of the guide tube (16).