JP2748254B2 - Paper feeder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder provided in an image forming apparatus such as a copying machine or a facsimile, and more particularly, to a drive roller mounted on a fixed position, A driven roller having a roller abutting on a drive roller and having both ends of a roller shaft movably supported by opposing side plates; a stay provided between the side plates has a groove fitted to the roller shaft. A bearing having a bearing, a bearing mounting plate for slidably supporting the bearing, and a plurality of pressurizing mechanisms including a compression spring interposed between the bearing and the bearing mounting plate. The present invention relates to a paper feeder configured to pressurize to the side.

[Conventional technology]

Conventionally, in this type of paper feeding apparatus, as shown in FIG. 4, a bearing mounting plate a is fixed to a stay b provided between side plates (not shown) of the image forming apparatus with screws c or the like. Was. In the drawing, d is a bearing having a groove e fitted to a roller shaft (not shown) of the driven roller, and f is a compression spring for pressure interposed between the bearing d and the bearing mounting plate a. The bearing mounting plate a includes a substrate h having a support portion g of a compression spring f at the center, a pair of guide pieces i, i slidably fitted with bearings d extending from both ends thereof, and one of the substrates h. It is formed by a leg plate j bent and extended to the side, a projection k provided on the leg plate j, a screw hole 1 and the like. Symbols m and n are a screw hole formed in the stay b and a positioning hole into which the protrusion k is inserted.

[Problems to be solved by the invention]

In the conventional example described above, since the stay b and the bearing mounting plate a are fixed with screws c or the like, uneven wear of the bearing d may occur due to misalignment between the bearing d and the roller shaft supported by the bearing d. In order to prevent these problems, the mounting of the side plate and the stay b, and the stay b and the bearing are performed so that there is no misalignment between the bearing d and the roller shaft. High accuracy was required for mounting the mounting plate a.

In view of the above-mentioned conventional drawbacks, the present invention can provide uneven bearing wear, increased load and abnormal noise caused by misalignment between the bearing and the roller shaft without securing high accuracy in mounting the side plate and the stay. It is intended to provide a paper feeding device that prevents such a problem from occurring.

[Means for solving the problem]

The technical measures taken by the present invention to achieve the above object are as follows. That is, a feature of the present invention is that, in the paper feeder described at the beginning, the bearing mounting plate is slidably fitted to a substrate having a compression spring support at the center and the bearings extending from both ends of the substrate. A pair of guide pieces, a projection provided directly below the supporting portion of the substrate, and leg plates bent and extended from the substrate in opposite directions from both sides of the projection. Insert freely into the positioning holes formed in
The leg plate is movably abutted on the stay.

[Action]

According to the above-described configuration, the bearing mounting plate is not fixed to the stay, the leg plate is simply movably contacted and supported, and the positioning hole formed in the stay is sufficiently larger than the projection. Since the projection is large and freely movable in the hole, the bearing is pressed by the roller shaft even if there is a misalignment between the bearing and the roller shaft due to a manufacturing error of the mounting portion between the side plate and the stay. As a result, the bearing mounting plate moves with respect to the stay, and the function of self-alignment is exhibited, so that the above-mentioned misalignment is corrected.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a paper feeder according to the present invention.
In the figure, reference numerals 1,1 denote opposite side plates, and a fixed position between the side plates 1,1 comprises a plurality of rollers 2a... Arranged at intervals in the axial direction and a roller shaft 2b. A drive roller 2 having input means 2c from a power source (not shown) is mounted on one end of the shaft 2b. 3 is a roller 2a of the driving roller 2 ...
And a roller shaft 3b, which is in contact with the side plates 1, 1 and 2. Both ends of the roller shaft 3b
It is movably supported via. A stay 5 is provided between the side plates 1 and 1. The stay 5 includes the roller shaft
A bearing 6 having a V-shaped or U-shaped groove 6a to be fitted into 3b, and having two linear grooves 6b, 6b parallel to both side surfaces, and a bearing mounting plate slidably supporting the bearing 6 7 and bearing 6
Coil-shaped compression spring 8 interposed between the bearing and the bearing mounting plate 7
Are provided, and are configured to press the roller shaft 3b toward the drive roller 2 side.

As shown in FIGS. 1 and 3, the bearing mounting plate 7 includes a substrate 10 having a support portion 9 for a compression spring 8 at the center, and a pair of guide pieces 11 extending upward from both ends of the substrate 10. , 11
And a projection provided on the substrate 10 directly below the support portion 9
12 and a pair of leg plates 13, 13 extending at right angles to the opposite direction from the substrate 10 on both sides of the projection 12, and the guide pieces 11, 11 slide in the linear grooves 6 b, 6 b of the bearing 6. It fits freely. The protrusion is provided at a predetermined position of the stay 5.
The positioning holes 14 that are sufficiently larger than 12 are the pressing mechanisms A.
The same number is provided.

The bearing mounting plate 7 engages the groove 6a of the bearing 6 with the roller shaft 3b while compressing and deforming the compression spring 8 against its elastic restoring force. It is freely inserted into the positioning hole 14 and the leg plate
13 and 13 are mounted on the stay 5 by movably contacting and supporting the stay 5. Reference numeral 15 denotes a sheet such as a copy sheet which is conveyed while being held between the driving roller 2 and the driven roller 3.

According to the above configuration, although the bearing mounting plate 7 is not fixed to the stay 5 and excessive movement is restricted by the engagement between the projection 12 and the positioning hole 14, the leg plates 13, 13
Is merely pressed against the stay 5 surface by the force of the compression spring 8 and is movable with respect to the stay 5.
Due to the manufacturing error of the mounting part between the side plates 1, 1 and the stay 5, etc.
Even if there is a misalignment between the bearing 6 and the roller shaft 3b, the bearing 6
When the inner surface of the groove 6a is pressed by the roller shaft 3b, the bearing mounting plate 7 moves with respect to the stay 5, and the above-described misalignment is automatically corrected.

Although the bearing mounting plate 7 is not fixed to the stay 5, the pair of leg plates 13, 13 bent and extended in the opposite directions from the substrate 10 are supported on the stay 5, so that the bearing mounting plate 7 There is no risk of the 7 falling down unexpectedly.

〔The invention's effect〕

Since the present invention has the above-described configuration, even if high accuracy is not secured in mounting the side plate and the stay, there is a problem such as uneven wear of the bearing due to misalignment of the bearing and the roller shaft, an increase in load, and abnormal noise. This has the effect of preventing the occurrence of

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is an exploded perspective view of a main part of a paper feeder, FIG. 2 is a front view of the paper feeder, and FIG. 3 is a paper feeder. It is a vertical side view. FIG. 4 is an exploded perspective view showing a conventional example. A ... Pressure mechanism, 1 ... Side plate, 2 ... Drive roller, 3 ...
… Driven roller, 3a… roller, 3b… roller shaft, 5…
Stay, 6 ... Bearing, 6a ... Groove, 7 ... Bearing mounting plate,
8 compression spring, 9 support part, 10 substrate, 11 guide piece, 12 protrusion, 13 leg plate, 14 positioning hole.

Claims (1)

(57) [Claims] 1. A drive roller having a shaft mounted in a fixed position, and a driven roller having a roller abutting on the drive roller and having both ends of a roller shaft movably supported by opposing side plates. The stay is provided with a bearing having a groove to be fitted to the roller shaft, a bearing mounting plate for slidably supporting the bearing, and a compression spring interposed between the bearing and the bearing mounting plate. Provided a plurality of pressure mechanisms,
A paper feeder configured to press the roller shaft toward a driving roller, wherein the bearing mounting plate slides a substrate having a compression spring support portion at the center and the bearings extending from both ends of the substrate. A pair of guide pieces that fit freely, a projection provided directly below the support portion of the substrate, and leg plates bent and extended in opposite directions from the substrate on both sides of the projection; The paper feed device is characterized in that is inserted into a positioning hole formed in the stay so as to be freely movable, and the leg plate is movably supported on the stay.