JP2008105843A - Sheet transporting mechanism and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet transporting mechanism capable of suppressing drop of the rotational accuracy of a rotor by suppressing entering of paper dust, and an image forming device. <P>SOLUTION: The sheet transporting mechanism is equipped with a follower roller 62 having a peripheral surface in contact with the surface of each paper sheet 3, a supporting shaft 66 to support the follower roller 62 rotatably, and a rotary brush 65 installed in such an arrangement as adjoining the end faces 62d and 62e of the follower roller 62 and contacting with the supporting shaft 66 so as to suppress entering of the paper dust into the gap between the follower roller 62 and the supporting shaft 66. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a paper transport mechanism for transporting paper and an image forming apparatus including the paper transport mechanism.

  2. Description of the Related Art Conventionally, as a sheet conveying mechanism in an image forming apparatus, a mechanism including a driving roller to which a driving force is supplied and a driven roller that rotates in contact with the driving roller is known (see Patent Document 1). . In such a paper transport mechanism, the paper sandwiched between the driving roller and the driven roller is transported as the rollers rotate.

  Further, as the driven roller described above, a rotating shaft (type 1) rotating with respect to a support shaft fixed to the image forming apparatus main body, or a rotating shaft integrally formed at both ends of the driven roller is supported by a bearing. What rotates by this (type 2) is known.

JP-A-5-58527

  By the way, when the paper is conveyed while being sandwiched between the driving roller and the driven roller, paper dust may be generated from the paper. Note that the generation of the paper dust is noticeable when the quality of the paper is low.

  When such paper dust is generated, there is a possibility that paper dust may enter between the driven roller and the support shaft in the type 1 driven roller. In the type 2 driven roller, the rotary shaft and the bearing There was a possibility that paper dust might invade. And when paper dust penetrate | invades in this way, there existed a possibility that the rotational accuracy of a driven roller might fall.

  Therefore, an object of the present invention is to provide a paper transport mechanism and an image forming apparatus that can suppress a decrease in rotational accuracy of a rotating body by suppressing the intrusion of paper dust.

  The present invention that solves the above-described problems is a paper transport mechanism for transporting paper, and includes a rotating body having a peripheral surface in contact with the surface of the paper, a support shaft that rotatably supports the rotating body, and the rotation A restraining member that suppresses intrusion of foreign matter between the rotating body and the support shaft by being disposed adjacent to the end surface of the body and in contact with the support shaft. Features.

  The present invention is also a paper transport mechanism for transporting paper, wherein the rotating body has a peripheral surface that contacts the surface of the paper, and extends outward from both ends of the rotating body, and rotates integrally with the rotating body. A rotating shaft that rotates, a bearing that rotatably supports the rotating shaft, and an end surface of the bearing that is adjacent to the rotating body side and is in contact with the rotating shaft. And a suppressing member that suppresses intrusion of foreign matter between the shaft and the shaft.

  Here, “adjacent” means that the suppressing member and the end face of the rotating body (or bearing) are adjacent to each other, and that they are adjacent to each other via a slight gap or some member. .

  According to the present invention, the suppressing member is disposed adjacent to the end surface of the rotating body (or bearing) and in contact with the support shaft (or rotating shaft), so the rotating body (or bearing) and the supporting shaft ( Intrusion of paper dust to the rotation shaft) is suppressed.

  According to the present invention, since the suppressing member is disposed adjacent to the end face of the rotating body (or bearing) and in contact with the support shaft (or rotating shaft), the intrusion of paper dust is suppressed and the rotating member rotates. A decrease in rotational accuracy of the body can be suppressed.

[First Embodiment]
<Overall configuration of laser printer>
First, the overall configuration of a laser printer as an example of the image forming apparatus of the present invention will be briefly described. In the drawings to be referred to, FIG. 1 is a side sectional view showing an embodiment of a laser printer as an example of an image forming apparatus of the present invention.
As shown in FIG. 1, the laser printer 1 includes a feeder unit 4 for feeding a sheet 3 into a main body casing 2, an image forming unit 5 for forming an image on the fed sheet 3, and the like. ing.

<Configuration of feeder section>
The feeder unit 4 includes a paper feed tray 6 that is detachably attached to the bottom of the main casing 2 and a paper pressing plate 7 provided in the paper feed tray 6. The feeder unit 4 includes a sheet feeding roller 8 and a sheet feeding pad 9 provided above one end of the sheet feeding tray 6, and a sheet provided downstream of the sheet feeding roller 8 in the conveying direction of the sheet 3. Powder removing rollers 10 and 11 are provided. Further, the feeder unit 4 includes a registration roller 12 provided on the downstream side with respect to the paper dust removing rollers 10 and 11.

  In the feeder section 4 configured as described above, the paper 3 in the paper feed tray 6 is brought close to the paper feed roller 8 side by the paper pressing plate 7 and sent out by the paper feed roller 8 and the paper feed pad 9. After passing through the various rollers 10 to 12, the sheets are conveyed one by one to the image forming unit 5.

<Configuration of image forming unit>
The image forming unit 5 includes a scanner unit 16, a process cartridge 17, a fixing unit 18, and the like.

<Configuration of scanner unit>
The scanner unit 16 is provided at an upper portion in the main body casing 2 and includes a laser light emitting unit (not shown), a polygon mirror 19 that is rotationally driven, lenses 20, 21 and reflecting mirrors 22, 23, 24, and the like. . As indicated by the chain line, the laser beam based on the image data emitted from the laser emission unit passes or reflects in the order of the polygon mirror 19, the lens 20, the reflecting mirrors 22, 23, the lens 21, and the reflecting mirror 24, and the process cartridge. The surface of the 17 photosensitive drums 27 is irradiated by high-speed scanning.

<Process cartridge configuration>
The process cartridge 17 is disposed below the scanner unit 16 and is configured to be detachably attached to the main body casing 2. A developing cartridge 28, a photosensitive drum 27, a scorotron charger 29, and a transfer roller 30 are mainly provided in a hollow casing 51 that constitutes the outer frame of the process cartridge 17.

  The developing cartridge 28 is detachably attached to the housing 51 and includes a developing roller 31, a layer thickness regulating blade 32, a supply roller 33, and a toner hopper 34. The toner in the toner hopper 34 is supplied to the developing roller 31 by the rotation of the supply roller 33 in the arrow direction (counterclockwise direction). At this time, the toner is positively frictionally charged between the supply roller 33 and the developing roller 31. Is done. The toner supplied onto the developing roller 31 enters between the layer thickness regulating blade 32 and the developing roller 31 as the developing roller 31 rotates in the direction of the arrow (counterclockwise), and is thin with a certain thickness. It is carried on the developing roller 31 as a layer.

  The photosensitive drum 27 is supported by the housing 51 so as to be rotatable in the arrow direction (clockwise). The photosensitive drum 27 has a drum body grounded and a surface portion formed of a positively chargeable photosensitive layer.

  The scorotron charger 29 is disposed above the photosensitive drum 27 so as to face the photosensitive drum 27 with a predetermined interval therebetween. The scorotron charger 29 is a positively charged scorotron charger that generates corona discharge from a charging wire such as tungsten, and is configured to uniformly charge the surface of the photosensitive drum 27 to a positive polarity. ing.

  The transfer roller 30 is disposed below the photosensitive drum 27 so as to face and contact the photosensitive drum 27, and is supported by the housing 51 so as to be rotatable in the arrow direction (counterclockwise direction). The transfer roller 30 is configured by covering a metal roller shaft with a conductive rubber material. A transfer bias is applied to the transfer roller 30 by constant current control during transfer.

  The surface of the photosensitive drum 27 is uniformly positively charged by the scorotron charger 29 and then exposed by high-speed scanning of the laser beam from the scanner unit 16. Thereby, the potential of the exposed part is lowered, and an electrostatic latent image based on the image data is formed. Here, the “electrostatic latent image” refers to an exposed portion of the surface of the photosensitive drum 27 that is uniformly positively charged and exposed to a laser beam to have a lowered potential. Next, when the developing roller 31 rotates, the toner carried on the developing roller 31 is supplied to the electrostatic latent image formed on the surface of the photosensitive drum 27 when it contacts the photosensitive drum 27. . The toner is visualized by being selectively carried on the surface of the photosensitive drum 27, whereby a toner image is formed by reversal development.

  Thereafter, the photosensitive drum 27 and the transfer roller 30 are rotationally driven so as to sandwich and convey the sheet 3 between them, and the sheet 3 is conveyed between the photosensitive drum 27 and the transfer roller 30, so that the photosensitive drum 27 and the transfer roller 30 are photosensitive. The toner image carried on the surface of the drum 27 is transferred onto the paper 3.

<Configuration of fixing unit>
The fixing unit 18 is disposed on the downstream side of the process cartridge 17, and is provided with a heating roller 41, a pressure roller 42 that faces the heating roller 41 and presses the heating roller 41, and the heating roller 41 and the pressure roller 42. A pair of transport rollers 43 provided on the downstream side are provided. In the fixing unit 18 configured as described above, the toner transferred onto the sheet 3 is thermally fixed while the sheet 3 passes between the heating roller 41 and the pressure roller 42, and then the sheet is transferred. 3 is transported to a paper discharge path 44 by a transport roller 43. The paper 3 sent to the paper discharge path 44 is discharged onto the paper discharge tray 46 by the paper discharge roller 45, or returned to the apparatus by reverse rotation of the paper discharge roller 45 and switching of the flapper 49. Thus, a plurality of reverse conveying rollers 50 are re-supplied to the upstream side of the image forming unit 5 in a reverse state to perform double-sided printing.

  Here, each of the rollers 8, 10, 11,... In the laser printer 1 corresponds to a paper transport mechanism for transporting the paper 3. And in this embodiment, this invention is applied to the conveyance roller 43 of each roller 8, 10, 11, ... which comprises a paper conveyance mechanism.

<Structure around the transport roller>
Next, the structure around the transport roller 43, which is a characteristic part of the present invention, will be described in detail. In the drawings to be referred to, FIG. 2 is a perspective view showing the structure around the transport roller in detail, and FIG. 3 is an exploded perspective view showing the structure around the transport roller in detail. 4 is an XX sectional view (a) of FIG. 3 and a YY sectional view (b) of FIG. 4 (a).

  The conveyance roller 43 includes a driving roller 61 and a driven roller 62. Further, the driven roller 62 is incorporated in the paper dust cleaning unit CU and is attached to the paper path cleaning unit CU so as to be replaceable with a transport path structure 63 constituting a part of the transport path.

  As shown in FIG. 3, the drive roller 61 includes a roller main body portion 61 a that comes into contact with the driven roller 62, and rotating shaft portions 61 b that protrude from the central portions at both ends of the roller main body portion 61 a. The driving roller 61 has a rotating shaft 61b fixed to the main casing 2 so as to be rotatable, and a driving force from a driving source (not shown) is transmitted to the rotating shaft 61b via a gear or the like. It is designed to rotate.

  The conveyance path structure 63 is integrated with the lower end of the side wall 63b so as to face the upper wall 63a, the side wall 63b formed so as to protrude downward from the appropriate position of the upper wall 63a, and the upper wall 63a. And a lower wall portion 63c formed on the surface. An insertion hole 63d for inserting the paper dust cleaning unit CU is formed in the upper wall portion 63a, and a paper dust cleaning unit, which will be described in detail later, is provided at an appropriate position of the edge of the insertion hole 63d. A pair of engaging grooves 63e that engage with the pair of engaging pieces 64f of the CU are formed.

  The paper dust cleaning unit CU mainly includes a housing case 64, a driven roller 62, and a pair of rotating brushes 65. The paper dust cleaning unit CU is installed on the lower wall portion 63c of the conveyance path structure 63 via the spring S, so that the paper S is constantly pressed toward the driving roller 61 by the spring S.

  The housing case 64 is formed in a container shape by a pair of first side walls 64a, a pair of second side walls 64b, and a bottom wall 64c (see FIG. 4A). A hole 64d for the driven roller 62 and a hole 64e for the rotating brush 65 are formed in each of the pair of first side walls 64a. In addition, a pair of engagement pieces 64f that engage with the pair of engagement grooves 63e of the transport path constituting body 63 are formed on one of the pair of second side walls 64b. It can freely move up and down with respect to the transport path structure 63 without falling down.

  The driven roller 62 includes a roller main body portion 62a having a peripheral surface in contact with the surface of the paper 3, and a gear portion 62b formed integrally with one end of the roller main body portion 62a. Further, the driven roller 62 is formed with a through hole 62c (see FIG. 4) that passes through the centers of the roller body 62a and the gear 62b. The support shaft 66 is inserted into the through hole 62c, and both ends of the support shaft 66 are fixed to the holes 64d of the first side wall 64a of the housing case 64, so that the driven roller 62 can be rotated by the support shaft 66. Supported by Further, the driven roller 62 supported by the housing case 64 via the support shaft 66 as described above is always pressed against the driving roller 61 by the spring S and is driven to rotate with respect to the driving roller 61. Further, when the spring S constantly presses the driven roller 62 against the driving roller 61 via the housing case 64 and the support shaft 66, the clearance between the through hole 62 c of the driven roller 62 and the support shaft 66 is reduced in the through hole 62 c. It occurs on the lower half of the inner peripheral surface.

  The rotating brush 65 is a brush in which hairs are radially planted. Specifically, as shown in FIG. 4 (b), a hair body 65a formed of animal hair or fiber, and the root of the hair body 65a. And a cylindrical support body 65b that supports the structure. And this support body 65b is fixed to the rotating shaft 67, and this rotating shaft 67 is rotatably engaged with the hole 64e of the 1st side wall 64a of the storage case 64, as shown to Fig.4 (a). The rotating brush 65 is rotatable with respect to the housing case 64. Furthermore, a gear 68 that meshes with the gear portion 62 b of the driven roller 62 is fixed to the rotating shaft 67, so that the rotating brush 65 rotates as the driven roller 62 rotates.

  The rotating brush 65 is adjacent to the end faces 62d and 62e of the driven roller 62 so as to be in close contact with each other, and is disposed in contact with the support shaft 66 as shown in FIG. Specifically, the rotating brush 65 is arranged so as to be in contact with the lower part (the arc part of about a quarter of the circumference) of the support shaft 66 on the downstream side in the transport direction of the paper 3 and on the lower side. It is installed. Further, the tip of the hair 65 a of the rotating brush 65 is formed to be thicker than the gap between the driven roller 62 and the support shaft 66.

Next, the operation of the paper dust cleaning unit CU will be described.
As shown in FIG. 4B, when the driving roller 61 is rotated, the driven roller 62 is rotated so as to be driven, and the rotating brush 65 is also rotated in conjunction with the driven roller 62. When the paper 3 is supplied between the driving roller 61 and the driven roller 62, the paper 3 is nipped between the two rollers 61 and 62 and conveyed.

  At this time, if the paper 3 is a low-quality paper, paper dust may be generated from the paper 3 and a part of the paper dust may adhere to the support shaft 66, but the support shaft 66 is driven roller 62. Is pressed upward, so that paper dust adhering to the upper side of the support shaft 66 does not enter between the support shaft 66 and the driven roller 62. Further, when the paper dust adhering to the upper side of the support shaft 66 moves to the downstream side and the lower side in the transport direction of the paper 3 with the rotation of the driven roller 62, the paper powder is accommodated in the housing case 64 by the rotating brush 65. It is swept out toward the second side wall 64b. That is, even if the paper dust tries to enter from the gap formed between the substantially half peripheral surface below the through hole 62 c of the driven roller 62 and the support shaft 66, the intrusion is suppressed by the rotating brush 65. ing. Then, the paper powder swept out by the rotary brush 65 in this manner is sequentially accumulated on the bottom wall 64 c of the housing case 64.

According to the above, the following effects can be obtained in the present embodiment.
Since paper dust about to enter between the driven roller 62 and the support shaft 66 is swept away by the rotating brush 65, it is possible to suppress a decrease in rotational accuracy of the driven roller 62. Furthermore, it is possible to suppress the generation of abnormal noise caused by paper dust entering between the driven roller 62 and the support shaft 66.

  Since the rotating brush 65 is employed as a member that suppresses intrusion of paper dust, the paper dust can be efficiently swept out (scraped out). In addition, since the tip of the rotating brush 65 is thicker than the gap between the driven roller 62 and the support shaft 66, the tip of the rotating brush 65 does not enter the gap, so that the driven roller 62 can be improved. Can be rotated.

  Since the paper dust cleaning unit CU is attached to the transport path structure 63 so as to be replaceable, when paper dust accumulates in the storage case 64, the paper dust cleaning unit CU is replaced with a new paper dust cleaning unit. This makes it easy to process paper dust. The removed paper dust cleaning unit CU can be reused by washing it with a washing device.

[Second Embodiment]
Next, a second embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the present embodiment, a part of the structure of the driven roller and the rotating brush in the first embodiment described above is changed. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals. The description thereof will be omitted. In the drawings to be referred to, FIG. 5 is a perspective view showing a partially broken paper dust cleaning unit according to the second embodiment. 6 is an arrow view (a) of the paper dust cleaning unit shown partially broken in FIG. 5 as viewed from the broken cross-section side, and a ZZ cross-sectional view of FIG. b).

  As shown in FIG. 5, in the paper dust cleaning unit CU ′ according to the second embodiment, unlike the first embodiment, the support shaft 66 is formed integrally with the driven roller 62. It functions as the rotation shaft of the driven roller 62. That is, the support shaft 66 formed integrally with the driven roller 62 is rotatably supported by the hole 64d of the first side wall 64a of the housing case 64. Here, the first side wall 64 a provided with the hole 64 d functions as a bearing for the support shaft 66.

  Further, as shown in FIG. 6A, the rotating brush 65 is adjacent to the inner surfaces 64g of the pair of first side walls 64a of the housing case 64, and as shown in FIG. It is disposed so as to contact the support shaft 66. Specifically, the rotating brush 65 is arranged so as to be in contact with the lower part (the arc part of about a quarter of the circumference) of the support shaft 66 on the downstream side in the transport direction of the paper 3 and on the lower side. It is installed.

Next, the operation of the paper dust cleaning unit CU ′ according to the second embodiment will be described.
As shown in FIG. 6B, if paper dust is generated when the paper 3 is conveyed by the driving roller 61 and the driven roller 62, the paper dust adheres on the support shaft 66. At this time, since the support shaft 66 rotates integrally with the driven roller 62, the paper dust adhering to the upper side of the support shaft 66 moves toward the rotating brush 65. The paper powder that has moved in this way is swept out into the housing case 64 by the rotating rotary brush 65. That is, even if the paper dust tries to enter through a gap formed between the support shaft 66 and the hole 64d formed in the first side wall 64a of the housing case 64, the intrusion is suppressed by the rotating brush 65. ing. Then, the paper powder swept out by the rotary brush 65 in this manner is sequentially accumulated on the bottom wall 64 c of the housing case 64.

According to the above, in the second embodiment, in addition to the same effects as in the first embodiment, the following effects can be obtained.
By rotating the support shaft 66 to which the paper dust adheres, the entire peripheral surface of the support shaft 66 can be cleaned with the rotating brush 65, so that the paper dust between the support shaft 66 and the hole 64d of the housing case 64 can be removed. Can be more reliably suppressed.

The present invention is not limited to the above embodiments, and can be used in various forms as exemplified below.
In each of the above embodiments, the rotating brush 65 is brought into contact with the end surfaces 62d and 62e of the driven roller 62 or the inner surface 64g of each first side wall 64a of the housing case 64, but the present invention is not limited to this. Absent. For example, the rotary brush 65 may be adjacent to each end face 62d, 62e, etc. in a state where a predetermined slight gap or a thin plate material such as a film is sandwiched between each end face 62d, 62e or the inner face 64g. In other words, the rotating brush 65 may be disposed so as to be close to or in contact with the end faces 62d and 62e of the driven roller 62 (or the inner face 64g of the first side wall 64a). In other words, if the rotating brush 65 is in contact with a portion of the exposed portion of the support shaft 66 that is closest to the end surfaces 62d and 62e of the driven roller 62 (or the inner surface 64g of the first side wall 64a). Good. Here, “proximity” means close enough to prevent the paper brush from entering with the rotating brush 65. More specifically, at least the hair ends of the rotating brush may be arranged adjacent to each other with a gap of 0.1 mm to several mm between each end face 62d, 62e or the inner face 64g.

  In addition, when the part which contacts the side surface of the rotating brush 65 rotates like 1st Embodiment, as shown in FIG. 7, between the rotating brush 65 and each end surface 62d, 62e of the driven roller 62, as shown in FIG. It is preferable to provide a non-rotating partition plate 69. Here, the partition plate 69 may be fixed or integrally formed with a non-rotating component such as the housing case 64. According to this, since the hair-like body 65a of the rotating brush 65 is not caught by the driven roller 62 that rotates, the rotating brush 65 and the driven roller 62 can be rotated satisfactorily.

  In each of the above embodiments, the rotating brush 65 is used as the restraining member. However, the present invention is not limited to this, and any material can be used as long as it is a soft member such as felt, sponge, or cloth. Also good. Moreover, in each said embodiment, although the hair-like body 65a was provided in the perimeter surface of the support body 65b, this invention is not limited to this, The hair-like body 65a is provided only in a part of support body 65b. You may make it provide.

  Furthermore, you may make it shorten the length of the hair body 65a by enlarging the thickness of the radial direction of the support body 65b which concerns on 1st Embodiment. More specifically, the support body 65b is formed to have a thickness that can be slidably contacted with the end faces 62d and 62e of the driven roller 62, and is slidably contacted with the driven roller 62. You may arrange | position in the state which left the predetermined clearance gap from the end surfaces 62d and 62e. According to this, it can suppress that the hair-like body 65a is wound in the driven roller 62 to rotate.

  In each of the above-described embodiments, the storage case 64 is functioned as a cover member that receives the paper dust swept by the rotating brush 65 and also functions as a paper dust reservoir for storing paper dust. However, the present invention is limited to this. Is not to be done. That is, the cover member and the paper dust reservoir may be configured separately.

  In each said embodiment, although the rotating brush 65 was rotated, this invention is not limited to this, It is good also as non-rotation. In this case, the gear portion 62b formed as the driven roller 62, the gear 68 meshing with the gear portion 62b, the rotating shaft 67, and the like are not necessary, and the cost can be reduced.

In each of the above embodiments, the driven roller 62 driven and rotated by the driving roller 61 is used as the rotating body. However, the present invention is not limited to this, and for example, a roller for switching the conveyance direction of the paper 3 is used. Also good. In each of the above embodiments, the present invention is applied to the transport roller 43. However, the present invention is not limited to this. For example, the present invention may be applied to other rollers such as a paper discharge roller 45 including a drive roller and a driven roller in the same manner as the transport roller 43. The invention may be applied.
In each of the above embodiments, the rotating brush 65 or the like is used for the purpose of suppressing the intrusion of paper dust, but the present invention is not limited to this, and may be used for the purpose of suppressing other foreign matters such as dust. .

  In each of the embodiments described above, the tip of the hair body 65a is thicker than the gap between the driven roller 62 (or the hole 64d of the housing case 64) and the support shaft 66, but the present invention is not limited to this and is narrow. May be. According to this, since the hair ends enter the gap, even if paper dust enters the gap, the paper powder can be scraped out.

  In the above embodiment, the present invention is applied to the laser printer 1. However, the present invention is not limited to this, and the present invention may be applied to other image forming apparatuses such as a copying machine and a multifunction machine.

  In the embodiment, the transfer roller 30 is used as an example of the transfer unit. However, the present invention is not limited to this, and for example, a non-contact type may be used.

  In the above embodiment, the toner is used as an example of the developer, the developing cartridge 28 is used as an example of the developing unit, the scanner unit 16 is used as an example of the exposure device, and the photosensitive drum 27 is used as an example of the photoconductor. It is not something. That is, it goes without saying that materials and structures can be changed as appropriate without departing from the spirit of the present invention.

1 is a side sectional view showing an embodiment of a laser printer as an example of an image forming apparatus of the present invention. It is a perspective view which shows the structure around a conveyance roller in detail. It is a disassembled perspective view which shows the structure around a conveyance roller in detail. It is XX sectional drawing (a) of FIG. 3, and YY sectional drawing (b) of FIG. 4 (a). It is the perspective view which fractured | ruptured and showed the unit for paper dust cleaning which concerns on 2nd Embodiment. It is the arrow directional view (a) which looked at the unit for paper dust cleaning shown partially broken in FIG. 5 from the broken surface side, and ZZ sectional drawing (b) of FIG. 6 (a). It is a partially broken side view which shows the modification of 1st Embodiment.

Explanation of symbols

1 Laser printer (image forming device)
3 Paper 4 Feeder unit 5 Image forming unit 16 Scanner unit (exposure device)
27 Photosensitive drum (photoconductor)
28 Developing cartridge (developing means)
30 Transfer roller (transfer means)
43 Transport roller (paper transport mechanism)
61 Drive roller 62 Driven roller (rotating body)
62a Roller body portion 62b Gear portion 62c Through hole 62d, 62e End face 64 Storage case (Paper dust storage)
64a First side wall (bearing)
64b Second side wall (cover member)
64g Inner surface 65 Rotating brush (suppressing member)
65a Hairy body 65b Support body 66 Support shaft 67 Rotating shaft 68 Gear 69 Partition plate CU Paper dust cleaning unit

Claims (14)

A paper transport mechanism for transporting paper,
A rotating body having a peripheral surface in contact with the surface of the paper;
A support shaft that rotatably supports the rotating body;
A restraining member that is disposed adjacent to the end surface of the rotating body and in contact with the support shaft, thereby suppressing entry of foreign matter between the rotating body and the support shaft. A paper transport mechanism characterized by that.   The paper transport mechanism according to claim 1, wherein the suppressing member is a brush.   The paper conveying mechanism according to claim 2, wherein the bristles of the brush are formed thicker than a gap between the rotating body and the support shaft.   The paper transport mechanism according to claim 2, wherein the bristles of the brush are formed narrower than a gap between the rotating body and the support shaft.   The sheet conveying mechanism according to any one of claims 2 to 4, wherein a partition member is disposed between the brush and the rotating body. A paper transport mechanism for transporting paper,
A rotating body having a peripheral surface in contact with the surface of the paper;
A rotating shaft extending outward from both ends of the rotating body and rotating integrally with the rotating body;
A bearing that rotatably supports the rotating shaft;
A restraining member that suppresses intrusion of foreign matter between the bearing and the rotating shaft by being disposed adjacent to the end surface of the bearing on the rotating body side and in contact with the rotating shaft; A paper transport mechanism comprising the paper transport mechanism.   The paper transport mechanism according to claim 6, wherein the suppressing member is a brush.   The paper conveying mechanism according to claim 7, wherein the bristles of the brush are formed thicker than a gap between the rotating shaft and the bearing.   The paper conveying mechanism according to claim 7, wherein the bristles of the brush are formed narrower than a gap between the rotating shaft and the bearing. The rotating body is
2. A driven roller that is driven and rotated by contact with a rotating driving roller supplied with a driving force from a motor so as to sandwich and convey the sheet with the driving roller. The paper transport mechanism according to claim 9.   The paper transport mechanism according to claim 1, wherein the suppressing member rotates.   The paper transport mechanism according to claim 11, wherein a cover member is provided in a direction in which foreign matter is scraped by the suppressing member.   The paper transport mechanism according to any one of claims 1 to 12, wherein a container-like paper dust reservoir is disposed below the rotating body. An image forming apparatus for forming an image on paper,
An exposure device that scans a laser beam in accordance with the input image signal;
A photoconductor on which an electrostatic latent image is formed by scanning laser light with the exposure device;
Developing means for supplying a developer to the photoreceptor;
Transfer means for transferring a developer image formed with the developer onto the paper;
An image forming apparatus comprising: the paper transport mechanism according to claim 1.

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