JPH06242707A - Paper carrying roller - Google Patents

Abstract

PURPOSE:To prevent the soiling of a paper sheet by installing a cleaning member on the outer peripheral part of a driven roller, in a paper carrying roller provided with the driven roller brought into contact with a driving roller and driven to rotate. CONSTITUTION:A pair of rollers used for an automatic recirculating document feeder are composed of the driving roller 45 driven to rotate at the time of carrying a document and the driven roller 46 pressed on the driving roller 45 by a spring, etc., and driven to rotate. The cleaning member 48 cleaning the surface of the document is formed on the outer peripheral part of the driven roller 46. The member 48 is made of a sheet material such as a felt sheet, a nonwoven fabric, Japanese paper. Since the cleaning member 48 is provided on the outer peripheral part of the driven roller 46, the cleaning member 48 always comes into contact with the surface of the document at the time of carrying it, to clean the soiling of the surface of the document. Thus, cleaning effect is made more improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating automatic document feeder, a document automatic feeder, a carrying roller for carrying sheets of a facsimile machine of a copying machine.

[0002]

2. Description of the Related Art A circulating automatic document feeder (R
In DH), in most cases, no consideration was given to the contamination of the document with respect to the pair of transport rollers that transport the document.

However, as a method for taking measures against this, conventionally, as shown in FIG. 4, the leaf spring 3 is fixed to the sheet guide member 4 in the driven side roller 2 of the pair of conveying rollers 1 and 2. A cleaning member 5 such as a felt is attached to one end of the felt, and the cleaning member 5 is pressed against the driven roller 2 to clean the surface of the conveying roller.

[0004]

However, the conventional cleaning mechanism requires a space for providing the cleaning member 5. Furthermore, the roller replacement work at the time of service maintenance was complicated.

Further, the cleaning member 5 is provided on the driven roller 2 of the conveying roller. However, since the surface of the driven roller 2 is slippery, the effect of removing dirt is small and the cleaning performance is not perfect.

Moreover, although the originals are set face down, there are single-sided originals and double-sided originals.
There is a problem that the document surface hits 2 and the driving roller 1 is also soiled.

In view of the above, it is an object of the present invention to provide a sheet conveying roller which prevents a sheet from being soiled by a simplified sheet cleaning mechanism.

[0008]

As shown in FIG. 1, a means for solving the problems according to the present invention includes a driving roller 45 which is driven and rotated,
A driven roller 46 that comes into contact with the drive roller 45 and is driven to rotate.
In the paper transporting roller in which the paper is transported between the rollers 45 and 46 by the rotation of the rollers 45 and 46, the outer peripheral portion of the driven roller 46 is the cleaning member 48 for cleaning the surface of the paper. is there.

[0009]

In the means for solving the above problems, the conveying rollers 45,
When the sheet 46 passes between the rollers 45 and 46 by rotation of the sheet 46, dirt on the surface of the sheet is cleaned by the cleaning member 48 on the outer peripheral portion of the driven roller 46.

Further, the dirt attached to the drive roller 45 is
After the paper has passed, the cleaning member 48 of the driven roller 46
Comes into contact with the drive roller 45, and the drive roller 45 is cleaned.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a sheet conveying roller showing an embodiment of the present invention, and FIG. 2 is a block diagram of a circulating automatic document feeder.

As shown in FIG. 2, the circulating automatic document feeder (RDH) of the copying machine in which the sheet conveying roller of the present embodiment is incorporated has a document placing portion 11, a conveying portion 12, and a first exposing portion 1 as shown in FIG.
3, a switchback unit 14, a second exposure unit 15, and a lower return unit 16.

The document placing section 11 has a suction belt 18 for feeding the document D from a document placing table 17 on which the document D is placed.
Is provided.

The transport section 12 includes a pair of guide members 19 and a pair of rollers 20, 21, 2 provided along the transport direction.
The fed document Di formed by No. 2 is transported between the exposure transport roller 23 and the first transparent plate 24 in the first exposure unit 13. Here, a pair of first registration rollers 25 is provided on the transport path upstream of the first transparent plate 24. With respect to the first registration roller 25, optical detectors 26 and 27 each including a pair of a light emitting element and a light receiving element are arranged in front of and behind the conveyance direction so as to face the conveyance path.

Rotational power from a motor (not shown) is transmitted to the roller 22 by a gear train (not shown) via a clutch connected to the rotation shaft of the roller 22. The rotational power of the motor is also transmitted to the roller 25 by another gear train (not shown) via a clutch connected to the rotation shaft of the first registration roller 25.

When the detector 26 detects the leading end of the document Di transported by the roller 22 in the transport direction, the clutch provided on the roller 22 is disengaged, and the transport of the document Di is temporarily stopped. When the copy sheet is ready to be conveyed to the transfer area of the photosensitive drum on the copying machine main body side (not shown), the above-mentioned two clutches are brought into a connected state, whereby the original document Di is exposed to the conveying roller 2 for exposure.
3 and the first transparent plate 24. At this time, the leading edge of the document Di in the transport direction is detected by the detector 27, and the transport operation of the copy sheet to the transfer area is controlled according to this timing.

The original document Di is pressed against the first transparent plate 24 by the transport roller 23 for exposure and is transported, so that the original image on one surface thereof is presented to the first exposure section 13. Next, the document Di is reversed in its conveyance direction by the switchback unit 14 and then conveyed by the second registration roller 28 between the exposure conveyance roller 29 in the second exposure unit 15 and the second transparent plate 30. .

In the switchback unit 14, the document Di from the first exposure unit 13 is switched from a transport path 33 formed by a pair of guide members and a pair of rollers 31 and 32 provided along the transport direction to a switching claw. It is introduced into the conveyance path 35 via 34.

The transport path 35 is provided with a pair of reversing rollers 36 which can rotate in the forward and reverse directions. The document Di transported to the transport path 35 is transported to the transport path 3 by reversing the rotation direction of the reversing roller 36 and switching guidance of the switching claw 34.
7 and is conveyed to the second registration roller 28 by the roller 38.

Roller 38 and second registration roller 28
Although not shown, each of them is provided with a clutch, and a pair of optical detectors 39, 4 are provided in front of and behind the second registration roller 28 in the transport direction, facing the transport path 37.
0 is placed. The operation of the clutches of the rollers 38 and 28 is controlled based on the outputs of the detectors 39 and 40.

Here, the rotative power of the motor is given to the exposure conveying roller 23 through a gear train (not shown), and the roller 3 is connected by an endless belt.
The rotational power of the motor is also applied to 1, 32 via another gear train. The rotational power applied to the roller 31 is also transmitted to the second registration roller 28 and the exposure transport roller 29 that are connected by an endless belt or the like. Furthermore, this motor transmits rotational power to the roller 38 via an idle gear or the like (not shown).

The original document Di is conveyed to the second exposure unit 15 by the rollers 31, 32, 38 and the second registration roller 28 which are rotationally driven by the above-described structure, and is conveyed to the second transparent plate 30 by the conveyance roller 29 for exposure. It is pressed and transported. The document Di conveyed through the second exposure unit 15 has its conveyance direction reversed in advance in the switchback unit 14, so that the document image on the other surface of the document Di is exposed in the second exposure unit 15.
To present.

In this way, the document Di for which the presentation of the document images on both surfaces has been completed, the pair of guide members in the lower return unit 16 and the pair of rollers 41, 4 provided along the conveying direction.
2, the lower return unit 16 is guided to be conveyed to the mounting table 17. On the lower side of the mounting table 17, half-moon rollers 43 and 44 are provided along the transport direction, and the half-moon rollers 43 and 44 are given rotational power from, for example, a stepping motor.

The document Di to be conveyed is a half-moon roller 43, 4.
When 4 is in the operating state shown in FIG. 2, it is stored in the lowermost portion of the document D stored on the mounting table 17 and returned.

As shown in FIG. 1, the pair of rollers used in the RDH includes a driving roller 45 that is driven and rotated when the document is conveyed, and a driven roller 46 that is driven by the driving roller 45 and is rotated by a spring or the like. Composed of.

By the way, the document Di conveyed in the RDH
In the case of, the guide member 47 or the like on the transport path causes printing on the surface of the document, peeling of the print, and paper dust. This moves to the roller side and stains the roller surface, and the document Di that is conveyed next is
To make it dirty. Generally, in order to convey the document Di,
The drive roller 45 is made of a material having a high friction coefficient, and the driven roller 46 only needs to press the drive roller 45. Therefore, the material of the surface of the driven roller 46 can be selected relatively softly.

Therefore, in order to prevent redeposition of stains on the document Di, a cleaning member 48 for cleaning the surface of the document is formed on the outer peripheral portion of the driven roller 46.

The driving roller 45 is formed of a material having a high friction coefficient such as rubber, is fitted onto a roller shaft 45a rotatably supported by the RDH main body, and is rotationally driven by a rotational power from a motor (not shown).

The driven roller 46 is a roller body 49 fitted onto a roller shaft 46a rotatably supported by the RDH body.
A cleaning member 48 is wound around the outer periphery of the. The cleaning member 48 is made of a sheet material such as felt sheet (chemical fiber felt, wool felt, etc.), non-woven fabric (trade name: Nomex paper, suede, etc.), and Japanese paper.

The diameter of the driven roller 46 around which the cleaning member 48 is wound can be adjusted to the diameter of a roller that has been normally used. However, even if the diameter of the driven roller 46 becomes large to some extent by the cleaning member 48, it is acceptable if the driven roller 46 can be pressurized. Further, the width dimension can be from the width of the drive roller 45 to the maximum paper feed width.

In the above structure, the transport rollers 45, 46
When the document Di is conveyed by rotating the, the dirt such as paper dust on the document surface is cleaned by the cleaning member 48 wound around the surface of the driven roller 46.

The dirt attached to the drive roller 45 is
After the document Di has passed, it is cleaned by the cleaning member 48 of the driven roller 46.

As described above, since the cleaning member 48 is provided on the outer peripheral portion of the driven roller 46, the cleaning member 48 always contacts the surface of the original when the original is conveyed. Therefore, the dirt on the surface of the document can be cleaned, and the cleaning effect is improved. Further, even if the drive roller 45 is dirty, the driven roller 46 is always in contact with the drive roller 45 except when the document Di is being conveyed, so that the drive roller 45 can be cleaned.

Furthermore, the cleaning member 4 is attached to the roller itself.
Since No. 8 is used, the conventional cleaning mechanism is unnecessary, and the space for the cleaning mechanism in the RDH is not needed. Further, the replacement of the cleaning member 48 at the time of service maintenance only needs to replace the driven roller 46, which facilitates the replacement work.

In the above embodiment, the dirt on the surface of the original can be effectively cleaned. In general, the dirt floating on the surface of the original moves from the one having good releasability to the one having bad releasability. In other words, the dirt on the surface of the original is
In addition, since the dirt is floating, it is considered that the original side has better releasability. Further, since the surface of the cleaning member 48 has unevenness as compared with general paper, it is considered that the releasability is poor. Therefore, the floating dirt on the document always moves to the cleaning member 48. That is, normally
Reattachment of dirt from the cleaning member 48 to the original document is unlikely.

However, when the cleaning member 48 becomes so dirty that the surface of the original cannot be cleaned, maintenance and roller replacement are normally performed. Even if the cleaning member 48 should not be replaced, as shown in FIG. And a removing member 50 such as a thin stainless plate,
The dust that has floated on the surface of the cleaning member 48 can be removed only by applying it to the surface of the cleaning member 48 of the driven roller 46. Therefore, the life of the cleaning member 48 can be increased.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

Although the present embodiment is applied to the circulation type automatic document feeder of the copying machine, it is not limited to this and may be applied to an apparatus other than the copying machine which conveys sheets.

[0039]

As is apparent from the above description, according to the present invention, the cleaning member on the outer peripheral portion of the driven roller allows the cleaning member to come into contact with the surface of the paper at the time of conveying the paper and clean the surface of the paper. Therefore, the cleaning effect is improved. Further, even when the drive roller is dirty, the driven roller is always in contact with the drive roller except when the paper is being conveyed, so that the drive roller can be cleaned.

Further, since the cleaning member is used for the roller itself, the conventional cleaning mechanism is not required and the space for the cleaning mechanism is not required. Further, since the cleaning member can be replaced during service maintenance by simply replacing the driven roller, there is an excellent effect that replacement work becomes easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a sheet conveyance roller showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a circulating automatic document feeder of a copying machine including a sheet conveying roller according to this embodiment.

FIG. 3 is a configuration diagram of a sheet conveying roller showing another embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional paper transport roller.

[Explanation of symbols]

 45 drive roller 46 driven roller 48 cleaning member

Claims (1)

[Claims] 1. A sheet conveying roller, comprising a driven roller which is driven to rotate and a driven roller which is driven to rotate in contact with the driving roller, wherein a sheet is conveyed between both rollers by rotation of both rollers. A sheet conveying roller, wherein the outer peripheral portion of the sheet is a cleaning member for cleaning the surface of the sheet.