JPH0551139A - Holding mechanism of paper feeding roller - Google Patents

Abstract

PURPOSE:To eliminate abnormal noise by suppressing vibration of a guide plate itself. CONSTITUTION:A vibration absorbing member 6 is provided, which is supported by a body frame 3 and abuts partially to a plate part 5, a supporting member 4, or the required position of a paper feeding shaft 2 so as to prevent their deformation, in a paper feeding roller holding mechanism which is provided with a paper feeding roller 1 for feeding paper, the paper feeding shaft 2 having the paper feeding roller 1 mounted dismountably on the one end of the paper feeding shaft 2, the body frame 3 for holding another end of the paper feeding shaft 2, the supporting member 4 for supporting the paper feeding shaft 2 at another end of the paper feeding roller 1, and the plate part 5 attached to the body frame 3 for supporting the supporting member 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller holding mechanism for an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 (a) and 5 (b), when the paper feed roller 1 of a copying machine is replaced due to abrasion, etc. The paper feed shaft 2 which is the rotation shaft of the paper roller 1 is rotatably supported at its central portion by the vertically bent end portion 40 of the support member 4, and the right end in the drawing is rotatably supported by the main body frame 3. It is supported. The left end of the paper feed shaft 2 is free so that the paper feed roller 1 can be easily attached and detached. Further, the supporting member 4 is provided on the main body frame 3 so that the paper feeding roller 1 rotates smoothly and the paper feeding is surely performed.
The end portion 41 bent at the side is joined to the main body frame 3, and the center plate portion 42 is joined to the guide plate 5.
The guide plate 5 is omitted in FIG.

When the paper 21 is fed from the paper feed cassette 20 having the separation claw 22 as shown in FIG. 5A, the load applied to the paper feed roller 1 at the time of paper feeding is small, and therefore, as described above. Even with the support method, the influence on the guide plate 5 and the like hardly poses a problem.

[0004]

However, in the paper feeding method using the friction pad, the load at the time of paper feeding becomes large and an abnormal sound is generated by the paper feeding roller 1 and the friction pad or by the vibration of the guide plate 5 itself. It tends to occur. The abnormal sound between the paper feed roller 1 and the friction pad can be eliminated by considering its material and shape, but there is a problem that the abnormal sound due to the vibration of the guide plate itself cannot be eliminated.

SUMMARY OF THE INVENTION The present invention has been made in view of these problems of the conventional paper feed roller holding mechanism, and an object of the present invention is to provide a paper feed roller holding mechanism capable of suppressing vibration of the guide plate itself and eliminating abnormal noise. It is a thing.

[0006]

According to a first aspect of the present invention, there is provided a paper feed roller for feeding paper, a paper feed shaft having the paper feed roller detachably attached to one end, and a paper feed shaft. Paper feed roller holding mechanism including a main body frame that holds the other end of the paper feed roller, a support member that supports the paper feed shaft on the other end side of the paper feed roller, and a plate portion that is attached to the main body frame and supports the support member In the paper feeding roller holding mechanism, a vibration preventing member is supported by the main body frame, and a part of the plate portion, the supporting member, or the paper feeding shaft is in contact with a predetermined position of the paper feeding shaft so as to prevent deformation thereof. Is.

The present invention according to claim 2 is the paper feed roller holding mechanism according to claim 1, wherein the vibration prevention member partially has an elastic member.

According to a third aspect of the present invention, the vibration preventing member presses the plate portion, the supporting member, or the paper feeding shaft to distort the paper by a predetermined amount in a direction in which the deformation is prevented when the paper is not fed. The paper feed roller holding mechanism according to claim 1.

[0009]

According to the present invention as set forth in claim 1, the main body frame supports the vibration preventing member, and a part of the vibration preventing member prevents the plate portion, the supporting member, or the predetermined position of the sheet feeding shaft from being deformed by them. Since they come into contact with each other, the vibrations of the plate portion, the supporting member, or the sheet feeding shaft are suppressed, and the abnormal noise is eliminated.

According to a second aspect of the present invention, the main body frame supports the vibration preventing member, and a part of the vibration preventing member having an elastic member is part of the plate portion, the supporting member, or the sheet feeding shaft. Since they abut on predetermined positions so as to prevent them from being deformed, vibrations of the plate portion, the supporting member, or the paper feeding shaft are suppressed, and abnormal noise is eliminated.

According to the third aspect of the present invention, the main body frame supports the vibration preventing member, and the vibration preventing member presses the plate portion, the supporting member, or the paper feeding shaft to prevent deformation when the paper is not fed. Since it is distorted in a predetermined direction by a predetermined amount, the vibration of the plate portion, the supporting member, or the paper feed shaft is suppressed, and the abnormal sound is eliminated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of a paper feed roller holding mechanism according to an embodiment of the present invention. FIG. 2 is a schematic sectional view seen from the direction A in FIG. That is, the body frame 3
To the rear frame 31 and the front frame 32, the ends of the elongated plate-shaped stay 61 and the ends of the guide plate 5 that is a plate are fixed with screws. An elastic member 7 made of rubber is sandwiched between the central portion of the stay 61 and the guide plate 5 therebelow. The stay 61 and the elastic member 7 form a vibration preventing member 6. A support member 4 is attached to the surface of the guide plate 7 opposite to the contact side of the elastic member 7 with screws or the like. The support member 4 has a fixing portion 41 and a receiving portion 40, both ends of which are bent vertically.

The fixed portion 41 of the support member 4 is formed by the rear frame 3
1 is fixed by welding or the like to the receiving portion 40, and a bearing 34 is provided in the receiving portion 40. The paper feed shaft 2 is rotatably supported by the bearing 34 and the bearing 33 provided on the rear frame 31. The left end of the paper feeding shaft 2 is provided so as to project from the bearing 34 toward the front frame 32 side, and the paper feeding roller 1 is inserted into the projecting end of the paper feeding shaft 2 so as not to come off during use. The end portion is fixed by a stop ring 11. The paper feed roller 1 is provided with a friction pad roller 30 for preventing double feeding of copy paper.

Next, the operation of the above embodiment will be described.

First, when the copying operation is performed and the copy paper in the paper feed cassette is fed by the paper feed roller 1,
The copy sheet is sandwiched between the sheet feed roller 1 and the friction pad roller 30 and conveyed to the upstream side. When two or more copy sheets are fed, the friction pad roller 30 prevents double feeding and only the copy sheet on the feed roller 1 side is conveyed.

The paper feed roller 1 has the bearing 3 as described above.
Since the paper is supported by only one side by 3, 34, the paper feed mechanism configured to use the friction pad roller 30 has a large load when the copy paper is conveyed, and is susceptible to vertical vibration. The vibration of the paper feed roller 1 is transmitted from the bearing 34 to the support member 4 and further to the guide plate 5 to vibrate the guide plate 5. The vibration of the guide plate 5 is transmitted to the elastic member 7 which is in contact with the guide plate 5,
The elastic member 7 supported by the stay 61 attached to the body frame 3 absorbs the vibration of the guide plate 5 by its elasticity and the supporting force of the stay 61, and suppresses the abnormal sound generated by the vibration of the guide plate 5. ..

Although the elastic member 7 in the above embodiment is made of rubber, the elastic member is not limited to this, and may be an elastic body such as synthetic resin, metal or spring.

The thickness of the elastic member 7 in the above embodiment is
The distance between the stay 61 and the guide plate 5 is the same, but the thickness is slightly larger than this distance, for example, 0.2 to 1.0 mm thicker than this distance, and the guide plate 5 is slightly bent downward. Thus, vibration may be made less likely to occur. In this case, the shape of the elastic member may be thickened at the center as shown in FIG.

Further, in the above embodiment, the elastic member 7 is provided between the stay 61 and the guide plate 5, but as shown in FIG. May contact or press the guide plate to suppress the vibration of the guide plate.

Further, in the above embodiment, the vibration preventing member 6 is brought into contact with the plate portion, but it may be brought into contact with the supporting member to suppress the vibration.

Further, in the above embodiment, the vibration preventing member 6 is brought into contact with the plate portion from above the paper feeding roller, but it may be brought into contact with from below the paper feeding roller. In this case, of course, instead of the plate portion, it may be brought into contact with the supporting member.

Further, in the above embodiment, the elastic member 7 of the vibration preventing member 6 is brought into contact with the plate portion, but the elastic member 7 is not elastic between the vibration preventing member 6 and the frame mounting portion or the contact portion. It may be formed of a body, and an elastic member may be sandwiched between the abutting portion and the vibration preventing member to suppress the vibration.

[0024]

As is apparent from the above description, the present invention provides a paper feed roller for feeding paper, a paper feed shaft having the paper feed roller detachably attached at one end, and a paper feed shaft. Paper feed roller holding mechanism including a main body frame that holds the other end of the paper feed roller, a support member that supports the paper feed shaft on the other end side of the paper feed roller, and a plate portion that is attached to the main body frame and supports the support member In the above, since it is supported by the main body frame and a part thereof is in contact with a predetermined position of the plate portion, the supporting member, or the paper feed shaft so as to prevent the deformation received by them, vibration of the guide plate itself is suppressed, It has the advantage of eliminating abnormal sounds.

[Brief description of drawings]

FIG. 1 is a schematic side view of a paper feed roller holding mechanism according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of the embodiment as seen from the direction A in FIG.

FIG. 3 is a schematic diagram showing the shape and thickness of an elastic member of another embodiment.

FIG. 4 is a partial cross-sectional view of another embodiment.

5A is a schematic side view of a conventional paper feed roller holding mechanism, and FIG. 5B is a schematic cross-sectional view seen from the direction B in FIG. 5A.

[Explanation of symbols]

 1 paper feed roller (paper feed roller) 2 paper feed shaft 3 main body frame 4 support member 5 guide plate (plate part) 6 vibration prevention member 7 elastic member 31 rear frame 32 front frame 61 stay

Claims (3)

[Claims] 1. A paper feed roller for feeding paper, a paper feed shaft having the paper feed roller detachably attached to one end, a body frame for holding the other end of the paper feed shaft, and the paper feed. The axis
In a paper feed roller holding mechanism including a support member that supports the other end of the paper feed roller and a plate portion that is attached to the main body frame and supports the support member, the paper feed roller holding mechanism is supported by the main body frame and partially. Is provided with a vibration preventing member that is in contact with a predetermined position of the plate portion, the supporting member, or the paper feeding shaft so as to prevent the deformation that they receive. 2. The paper feed roller holding mechanism according to claim 1, wherein the vibration prevention member partially has an elastic member. 3. The vibration preventing member presses the plate portion, the supporting member, or the paper feeding shaft to distort a predetermined amount in a direction for preventing the deformation when the paper is not fed. The paper feed roller holding mechanism according to claim 1, characterized in that.