JP2007197215A - Paper carrying device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper carrying device capable of precisely storing paper dust in a paper dust receiver, without depositing the paper dust in a specific place, by surely removing this paper dust, even if the large paper dust of fiber is generated, when a paper dust quantity is much. <P>SOLUTION: This paper carrying device has a first paper dust removing sheet 4 abutting on a paper carrier roller 2, a second paper dust removing sheet 5 existing under the first paper dust removing sheet 4 and abutting on the paper carrier roller 2, and the paper dust receiver 6 storing the paper dust removed from the paper carrier roller 2 by the first paper dust removing sheet 4 and the second paper dust removing sheet 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet conveying apparatus and an image forming apparatus equipped with the sheet conveying apparatus.

In an electrophotographic image forming apparatus, conventionally, in order to prevent the image quality from deteriorating due to paper dust being conveyed to a transfer unit that transfers a toner image on a photoreceptor onto a sheet, a transfer unit A paper dust removing device was attached to a registration roller located in front of the paper.
The paper dust removing device is composed of an elastic film-like paper dust removing member whose tip abuts against the registration roller and a paper dust receptacle, and scrapes the paper dust on the surface of the registration roller rotated by the paper dust removal member. Is to be housed in.

By the way, recently, paper with lower cost has been distributed, and when low-quality paper is used, the amount of paper dust increases and paper dust with large fibers tends to be generated. The situation cannot be dealt with by the powder remover. Also, if only one type of paper size is used, the position where paper dust accumulates is fixed, and paper dust overflows at that position even though the paper dust catcher is not full. There is also.
In the present invention, even if a large amount of paper dust is generated and paper dust having a large amount of fiber is generated, the paper dust is reliably removed, and the paper dust is accurately stored in the paper dust tray without depositing the paper dust at a specific location. It is an object of the present invention to provide a sheet conveying apparatus and an image forming apparatus that can perform the above-described process.

In order to achieve the above object, the invention according to claim 1 includes a first paper dust removing sheet that contacts the paper conveying roller, and a second paper that is below the first paper dust removing sheet and contacts the paper conveying roller. A paper transport device including a powder removal sheet and a paper powder receiver that stores paper powder removed from the paper transport roller by the first paper powder removal sheet and the second paper powder removal sheet is the main feature.
According to a second aspect of the present invention, in the paper conveying device according to the first aspect, the paper is provided with a brush roller that is in contact with the paper conveying roller and the first paper dust removing sheet and rotates in a direction to feed the paper dust to the paper dust receiver. The main feature is the transport device.
According to a third aspect of the present invention, an image forming apparatus equipped with the paper conveying apparatus according to the first aspect is the main feature.
According to a fourth aspect of the present invention, in the paper conveyance device according to the second aspect, the brush roller is mainly characterized by a paper conveyance device provided so as to be able to contact and separate from the first paper dust removing sheet. .

According to a fifth aspect of the present invention, in the paper conveyance device according to the second aspect, the brush roller is mainly characterized by a paper conveyance device provided so as to be movable with respect to the first paper dust removal sheet.
According to a sixth aspect of the present invention, there is provided the paper conveying apparatus according to the second aspect, wherein the paper conveyance device has a paper dust cleaning operation mode, and the paper for separating the driving roller and the driven roller constituting the paper conveying roller when the mode is executed. The main feature is the transport device.
According to a seventh aspect of the present invention, in the paper conveyance device according to the second aspect, a paper conveyance device in which a paper dust suction mechanism is provided on a side surface of the paper conveyance roller is a main feature.

According to an eighth aspect of the present invention, in the paper conveyance device according to the seventh aspect, the paper dust suction mechanism mainly includes a paper conveyance device including an intake fan and a dust collection box.
According to a ninth aspect of the present invention, in the paper conveying device according to the sixth and seventh aspects, the paper dust suction mechanism is mainly characterized by a paper conveying device that operates intermittently in the paper dust cleaning operation mode.
According to a tenth aspect of the present invention, in the paper conveying device according to the seventh aspect, the intake fan constituting the paper dust suction mechanism faces a side surface of a registration sensor disposed near the front side of the paper conveying roller. The main feature is the paper transport device.
The invention according to claim 11 is characterized in that, in the sheet conveying apparatus according to claim 10, a sheet conveying apparatus in which a rectifying fin is provided in the vicinity of the registration sensor.

  The paper conveying device of the present invention includes a first paper dust removing sheet that contacts the paper conveying roller, a second paper dust removing sheet that is below the first paper dust removing sheet and contacts the paper conveying roller, and the first paper A paper dust receiver for storing the paper dust removed from the paper transport roller by the powder removal sheet and the second paper dust removal sheet, and abutting the paper transport roller and the first paper dust removal sheet, Because it has a brush roller that rotates in the direction to feed it into the powder receiver, the amount of paper dust is large, and even if paper dust with large fibers is generated, it is reliably removed, and paper dust does not accumulate at specific places, Paper dust can be accurately stored in the paper dust tray.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a sheet conveying apparatus according to an embodiment of the present invention. The sheet conveying apparatus shows a registration unit of the image forming apparatus. A sheet fed from a sheet feeding unit (not shown) is composed of a driving roller 2-1 and a driven roller 2-2 via a sheet conveying path 1. It is configured to abut against the registration roller pair (paper conveying roller pair) 2. There is a transfer portion further downstream of the registration roller pair 2 to transfer the toner image on the photosensitive member onto the sheet.
The driven roller 2-2 is in contact with a brush roller 3, a first paper dust removing sheet 4, and a second paper dust removing sheet 5 that are pivotally supported or fixed to a frame (not shown). The first paper dust removing sheet 4 and the second paper dust removing sheet 5 are supported at their end portions in the width direction (a direction orthogonal to the paper transport direction), for example, by a support member (not shown). The paper dust on the surface of the resist roller pair 2 removed by the brush roller 3, the first paper dust removing sheet 4, and the second paper dust removing sheet 5 is accommodated in the paper dust receptacle 6.

The first bent piece 6-1 at the center of the paper dust receiver 6 is provided with an elastic film 7 that contacts the tip of the brush roller 3 at the tip. The tip of the second bent piece 6-2 on the upper surface of the paper dust receiver 6 is also in contact with the hair tip of the brush roller 3.
When conveying the paper to a transfer unit (not shown), paper dust adheres to the registration roller pair 2. The paper dust adhering to the registration roller pair 2 is scraped off by the first paper dust removing sheet 4 and stored in the paper dust receiver 6.
When paper having a large amount of paper dust is used, paper dust fibers are entangled with the tip of the first paper dust removal sheet 4, and the gap between the driven roller 2-2 and the first paper dust removal sheet 4 generated thereby. May cause other paper dust to slip through and fall on the paper again. In order to prevent this, a second paper dust removing sheet 5 is provided for scraping the paper dust slipped through the gap.

The brush roller 3 is in contact with the peripheral surface of the driven roller 2-2 and the upper surface of the first paper dust removing sheet 4, and the paper dust on the surface of the driven roller 2-2 is removed by rotation, and further the first paper dust removing sheet. 4 has a function of feeding paper dust accumulated on the paper dust receiver 6.
By providing the brush roller 3, the amount of paper dust scraped off by the first paper dust removal sheet 4 is reduced, and problems such as slipping through the paper dust are reduced, so that the paper dust removal function of the first paper dust removal sheet 4 is maintained. The period can be extended. As a result, the duration of the paper dust removing function of the second paper dust removing sheet 5 can be extended.

The paper dust attached to the tip of the brush roller 3 is flipped off by the elastic film 7 and accommodated in the paper dust receptacle 6. Even if the elastic film 7 is not provided, the same effect can be obtained by extending the first bent piece 6-1 so as to be in contact with the brush roller 3.
Here, the brush roller 3 can be brought into contact with and separated from the first paper dust removing sheet 4. This can prevent the paper dust collecting operation by the first paper dust removing sheet 4 from being hindered.
Further, the brush roller 3 is movable on the first paper dust removal sheet 4. Thus, the paper dust accumulated on the first paper dust removal sheet 4 can be moved to the back of the paper dust receiver 6. The image forming apparatus also has a paper dust cleaning operation mode. When this mode is executed, the driving roller 2-1 and the driven roller 2-2 are separated from each other. This can prevent the paper dust on the driven roller 2-2 from being transferred to the drive roller 2-1. Further, the brush roller 3 may be operated only in the paper dust cleaning operation mode.

FIG. 2 is a side view showing an example in which a paper dust suction mechanism is provided on the side surface of the paper conveying apparatus of FIG.
A paper dust suction mechanism 10 is provided on the side surface of the registration roller pair 2. The paper dust suction mechanism 10 includes an intake fan 11 as an intake means and a dust collection box 12 as a dust collection means. By providing the paper dust suction mechanism 10, paper dust scattered in the air can be sucked. Further, the paper dust suction mechanism 10 can efficiently collect the sucked paper dust by providing the dust collection box 12. The paper dust suction mechanism 10 operates intermittently during the paper dust cleaning operation mode. This can save energy.

The intake fan 11 faces the side surface of the registration sensor 8 disposed in the vicinity of the front side of the registration roller pair 2. In this way, it is easy to collect dust in the vicinity of the resist sensor 8, and paper dust accumulation on the resist sensor 8 is prevented.
Further, by providing the rectifying fins (rectifying means) 9 in the vicinity of the resist sensor 8, the air flow rate in the vicinity of the resist sensor 8 can be increased. As a result, dust collection near the resist sensor 8 can be further facilitated, and paper dust accumulation on the resist sensor 8 can be efficiently prevented.

FIG. 2 is a configuration diagram of a paper transport device according to an embodiment of the present invention. The side view which shows the example which provided the paper dust suction mechanism in the side surface of the paper conveying apparatus of FIG.

Explanation of symbols

2 Registration roller pair (paper transport roller)
DESCRIPTION OF SYMBOLS 3 Brush roller 4 1st paper dust removal sheet 5 2nd paper dust removal sheet 6 Paper dust receptacle 8 Registration sensor 9 Current flow fin 10 Paper dust suction mechanism 11 Suction fan 12 Dust collection box

Claims (11)

  A first paper dust removing sheet that contacts the outer peripheral surface of the paper transport roller at the tip; a second paper dust removing sheet that is below the first paper dust removing sheet and contacts the outer peripheral surface of the paper transport roller at the tip And a paper dust receiver for storing the paper dust removed from the paper transport roller by the first paper dust removing sheet and the second paper dust removing sheet.   2. The paper transport apparatus according to claim 1, further comprising a brush roller that contacts the paper transport roller and the first paper dust removing sheet and rotates in a direction to feed the paper dust to the paper dust receiver. Conveying device.   An image forming apparatus comprising the sheet conveying device according to claim 1.   3. The paper conveying apparatus according to claim 2, wherein the brush roller is provided so as to be able to contact and separate from the first paper dust removing sheet.   3. The paper conveying apparatus according to claim 2, wherein the brush roller is provided so as to be movable on the first paper dust removing sheet.   3. The paper conveying apparatus according to claim 2, wherein the paper conveying apparatus has a paper dust cleaning operation mode, and when the mode is executed, the driving roller and the driven roller constituting the paper conveying roller are separated from each other.   3. The paper conveying apparatus according to claim 2, wherein a paper dust suction mechanism is provided on a side surface of the paper conveying roller.   8. The paper conveying apparatus according to claim 7, wherein the paper dust suction mechanism includes an air suction unit and a dust collecting unit.   8. The paper conveying apparatus according to claim 6, wherein the paper dust suction mechanism operates intermittently during the paper dust cleaning operation mode.   8. The paper conveying apparatus according to claim 7, wherein the air suction means constituting the paper dust suction mechanism faces a side surface of a registration sensor disposed near the front side of the paper conveying roller. Conveying device.   11. The paper conveying apparatus according to claim 10, wherein a rectifying means is provided in the vicinity of the registration sensor.

Images