JPH1120980A - Paper conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the replacement of a fed roller by forming a groove shape support on both ends of a device body and providing an opening, which opens in the orthogonal direction to the feed roller shaft, on the groove shape support. SOLUTION: A pair of side frames 7, which are the supporting members for supporting a press roller 4, is provided on both sides of a device body frame 1 and an U shape groove 7u is provided on each side frame 7. The inner wall of the U shape groove 7u us formed with a protuberant stripe 7a along its circumferential direction and, which a groove 6b on a pair of bearings 6 for a roller 5a of the feed roller engaged with the protuberant stripe 7a, the pair of bearings 6 is fitted into the U shape groove 7u of the side frame in pair. Because the U shape groove 7u is provided with an opening, which opens in the orothogonal direction to a shaft 5a of the roller 5a or the feed roller, replacement of the roller 5a of the feed roller and the steps for replacing it is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sheet transport device provided in an image forming apparatus or the like and for transporting a sheet as a recording medium.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus or the like is provided with a sheet conveying device for conveying a sheet to a printing unit or the like. Generally, in such a paper transport apparatus, a feed roller is used in which both ends are rotatably supported by a support section on the apparatus main body side and is driven by a drive source on the apparatus main body side. Another roller is in contact with the feed roller, and the sheet is conveyed between the feed roller and the other roller. Both ends of the feed roller are supported by bearings or the like on supporting portions such as holes provided on the main body side.

[0003]

However, in the above-described conventional paper transport apparatus, when the feed roller is replaced due to wear or the like, the feed roller is supported at both ends by supporting portions such as holes. This caused a problem that parts such as bearings, gears, and pulleys attached to the feed roller, as well as peripheral parts, had to be removed. Further, there has been a problem that the procedure for attaching and detaching the parts attached to the feed roller and peripheral parts becomes complicated. For this reason, it has become a major cause of troubles such as a decrease in maintainability of the apparatus.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional drawback, to facilitate replacement of a feed roller for transporting a sheet, thereby improving maintainability.
It is an object of the present invention to provide a sheet conveying device capable of replacing a unit of a feed roller.

[0005]

In order to achieve the above object, the present invention provides a feed roller which is detachably and rotatably supported on groove-like support portions formed at both ends of a frame of an apparatus body. A driven rotary body attached to the feed roller, and a drive rotary body provided on the apparatus main body side and transmitting rotation to the driven rotary body, and the groove-shaped support portion is orthogonal to the rotation axis of the feed roller. It has an opening that opens in the direction. The support portion is a U-shaped groove that opens on the side of the driven rotary shaft in the direction of the extension line connecting the drive rotary shaft and the driven rotary shaft. Further, the driven rotating body and the driving rotating body are each a gear.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sheet conveying device according to an embodiment of the present invention. FIG. 1 is a plan view showing a sheet conveying device according to an embodiment of the present invention. FIG.
FIG. 3 is a side view showing the sheet transport device.

First, the configuration of the sheet transport device will be described. As shown in FIG. 1, the sheet conveying device includes a unitized feed roller 5, a plurality of press rollers 4 for pressing the feed roller, a leaf spring-shaped pressing member 3 for pressing the press roller 4, It mainly comprises a frame 1 on which the pressing member 3 is mounted, and a pair of side frames 7 supporting the press rollers 4 provided on both sides of the frame 1.

The unitized feed roller 5 includes:
Five rollers 5a are mounted at equal intervals, a shaft 5s rotating integrally, a pair of bearings 6 rotatable at both ends of the shaft 5s, and a shaft 5 mounted at one end of the shaft 5s.
and a gear 8 which rotates integrally with the roller 5a.
The materials and shapes of the five rollers are the same except for the mounting position. As shown in FIGS. 1 and 2, the bearing 6 is provided with a groove 6 b having a smaller diameter than the flange 6 a between the flanges 6 a. A section 6 is provided on a flange 6 a of the bearing 6 located on the tip side of the feed roller 5. A projection 10 a is provided on the tip side of the section 10 toward the center in the longitudinal direction of the feed roller 5.

A pair of side frames 7 are provided with U-shaped grooves 7u. On the inner wall of the U-shaped groove 7u, a ridge 7a is formed along the circumferential direction. The bearing 6 is mounted such that the groove 6b of the bearing 6 is engaged with the ridge 7a, and the pair of bearings 6 is fitted into the U-shaped groove 7u of the pair of side frames 7. Then, the projection 10 a of the projecting piece 10 is engaged with the hole 7 b provided in the frame side portion 7, thereby preventing the bearing 6 from rotating.

That is, the feed roller 5 has a bearing 6
, And is rotatably supported by the side frame 7. A gear 8 is attached to one end of the shaft 5s of the feed roller 5 so as to rotate integrally.

A press roller 4 is pressed against each peripheral surface of the five rollers 5a of the feed roller 5. The pressing is performed by the pressing member 3. The components of the five press rollers 4 and the pressing member 3 are the same and are common. As shown in FIGS. 1 and 2, a bending portion 3 a is provided at one end of the pressing member 3 so as to sandwich a press roller. The bending portion 3a supports a shaft 4a of the press roller 4, and the press roller 4 is rotatable. As described above, the press roller 4 and the pressing member 3 are unitized and are common components.

The other end of the pressing member 3 is connected to the frame 1 with screws 2
Installed by. The pressing member 3 of the press roller 4 for pressing the roller 5a shown in FIG. 1 is mounted on the upper surface of the frame 1, as shown in FIG.

As shown in FIG. 2, the gear 8 is meshed with and connected to the drive gear 9. The gear 8 is a driven rotating body, and the driving gear 9 is a driving rotating body. The gear 8 is configured to be disposed above a vertical line of the drive gear 9. The drive gear 9 is attached to a drive source (not shown) so as to rotate.

Next, the operation of the sheet in the sheet transport device will be described. The sheet P is fed from the right side in FIGS.
It is conveyed toward between the press roller 4. The press roller 4 is pressed by the pressing member 3 against the roller 5 a of the feed roller 5 with a pressing force F. The drive gear 9 is rotated by the rotation of a drive source (not shown), and the rotation of the drive gear 9 is transmitted to the gear 8. As the gear 8 rotates, the feed roller 5 rotates. The press roller 4 is driven to rotate by the rotation of the roller 5 a of the feed roller 5. And
The paper P is sandwiched between the roller 5a and the press roller 4. The paper P sandwiched between the roller 5a and the press roller 4 is shown in FIG.
Are transported in the direction of the arrow Pa as shown in FIG.

Next, the attachment / detachment of the feed roller of the sheet conveying device will be described. As described above, the feed roller 5
The unit is composed of a pair of bearings 6 rotatable at both ends of a shaft 5s, and a gear 8 attached to one end of the shaft 5s and rotating integrally with the feed roller 5. Therefore, the feed roller 5 can be removed as a unitized feed roller 5 simply by removing the screw 2, removing the press roller 4, and removing the protrusion 10 a from the hole 7 b.

Further, as described above, the gear 8 is disposed above the drive gear 9 in the vertical direction. Therefore, it can be removed as a unitized feed roller 5 without removing peripheral components, for example, the drive gear 9. Also, the removal procedure is simplified.

When the unitized feed roller 5 is mounted, the bearing 6 of the unitized feed roller 5 is dropped into the opening of the U-shaped groove 7u,
If the bearing 6 is supported by the U-shaped groove 7u, then, only the stopper 10 and the press roller 4 need to be mounted. Therefore, it can be attached by a simple procedure regardless of peripheral parts. In addition, since the U-shaped groove 7u has an opening on the side of the gear 8 in the direction of the extension extending between the gear 8 and the gear 9, stress such as the gear 9 pushing up or pulling in the gear 8 during driving does not occur. , And stable gear driving can be achieved.

As described above, attachment and detachment of the feed roller 5
Since the desorption procedure is simplified, the maintainability of the device is improved.

In the above embodiment, the case where the roller portion of the feed roller is divided has been described.
The present invention can be similarly applied to a case where the roller unit is not divided, for example, a roller unit having the length of the sheet width.

Further, in the above-described embodiment, a case where a leaf spring-shaped pressing member is used has been described. However, the present invention can be similarly applied to a case where an elastic member such as a compression spring is used.

[0021]

As described above, according to the present invention, when the feed roller is replaced due to wear or the like, it is necessary to remove and attach parts such as bearings, gears, pulleys, and peripheral parts attached to the feed roller. The troublesome work can be reduced. Furthermore, the procedure for attaching and detaching the parts attached to the feed roller and peripheral parts can be simplified. For this reason, it is possible to provide a device having excellent maintainability of the device.

A feed roller and a bearing;
The gear can be made into a unit, and in particular, it can be mounted simply by dropping the feed roller unit, so that the maintainability can be further improved. Further, since the driven rotating body is disposed above the vertical line of the driving rotating body, unnecessary stress such as the driving rotating body pushing up or pulling in the driven rotating body during driving can be prevented,
A stable rotating body can be provided.

Further, there is no need to attach and detach the belt as in the case of the pulley, and the belt can be easily attached and detached.
The transmission of the driving force can be ensured.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a sheet conveying device according to an embodiment of the present invention.

FIG. 2 is a side cross-sectional view illustrating a sheet conveying device.

[Explanation of symbols]

 5 feed roller 7u U-shaped groove (opening) 8 gear (drive rotating body) 9 gear (driven rotating body) P paper

Claims (3)

[Claims] 1. A feed roller detachably and rotatably supported by groove-like support portions formed at both ends of a frame of an apparatus main body, a driven rotating body attached to the feed roller, and an apparatus main body side. And a driving rotator for transmitting rotation to the driven rotator, wherein the groove-shaped support portion has an opening opening in a direction orthogonal to the rotation axis of the feed roller. . 2. The support member has a U-shaped opening that opens on the side of the driven rotary shaft in the direction of an extension line connecting the drive rotary shaft and the driven rotary shaft.
The sheet conveying device according to claim 1, wherein the sheet conveying device is a groove. 3. The sheet conveying device according to claim 1, wherein the driven rotating body and the driving rotating body are gears.