JPH0229059Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a paper feeding device used in a copying machine or the like.

BACKGROUND ART In the prior art, the spring force of a swing plate provided in a paper feed cassette body for loading copy paper is fixed and cannot be adjusted. Therefore, the optimal suppressing force to the locking claw can be obtained depending on the copy paper of different paper quality (i.e., thickness, stiffness, type of high-quality paper, tracing paper, etc.) stored in the paper feed cassette. As a result, paper jams may occur, such as when two sheets of copy paper are fed at the same time or when copy sheets are fed diagonally.

Problems to be Solved by the Invention Accordingly, the main purpose of the invention is to provide a paper feeding device that can apply an optimal suppressing force to paper such as copy paper to be stored.

Means for Solving the Problems The present invention has a cassette at the bottom of the main body of the paper feed cassette, which has a locking claw for separating the paper, at the rear in the paper feed direction.
A rocking plate is provided which is swingable around an axis perpendicular to the paper feeding direction and for loading paper, and a biasing means for urging the rocking plate upward is connected to the rocking plate and the paper feed cassette. A paper feeding device provided between the cassette main body and the bottom of the cassette main body, the guide hole being provided in the bottom of the cassette main body and extending along the paper feeding direction; and the urging means movably guided along the guide hole. and means for fixing the biasing means to the bottom at a desired position along the guide hole.

Embodiment FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.
FIG. 2 is a plan view showing the paper feeding device (paper feeding cassette) 1 with the swing plate 2 removed. Copy paper 24, which is paper, is stored in the paper feed cassette main body 3, as shown by the imaginary line. A pair of locking claws 5 are fixedly provided at both widthwise corners of the front end of the paper feed cassette main body 3 in the paper feeding direction 4, and the lower surface of the locking claws 5 It faces the top surface of the copy paper 24 stored in the paper cassette main body 3.
A pivot piece 6 bent downward is formed on the swing plate 2 at the rear in the paper feeding direction 4 . This pivot piece 6
are provided in pairs in the width direction (vertical direction in FIG. 2) perpendicular to the paper feeding direction 4. This pivot piece 6
is loosely inserted into a locking pawl 8 formed in the bottom 7 of the paper feed cassette main body 3. In this way, the rocking plate 2
It is swingable about an axis perpendicular to the paper feed direction 4 and parallel to the bottom 7 of the paper feed cassette body 3. The swing plate 2 extends forward in the paper feed direction 4 from the pivot piece 6, and its front end 9 in the paper feed direction 4 is located below the locking claw 5.

A spring 17 serving as a biasing means is interposed between the lower surface of the swing plate 2 and the upper surface of the bottom 7 of the paper feed cassette main body 3. The springs 17 are arranged in pairs at intervals in the width direction perpendicular to the paper feeding direction 4. A leaf spring 17 is used to bias the rocking plate 2 upward. A spring force adjusting means 18 for adjusting the spring force of the leaf spring 17 includes a bolt 19 that is a pair of fixing means screwed onto the rear end of the spring 17 in the sheet feeding direction 4. The leaf spring 17 includes an attachment portion 20 and an inclined portion 21 extending upward from the attachment portion 20 toward the paper feeding direction 4.
The upper end portion contacts the lower surface of the swing plate 2. spring 17
Internal threads for screwing into the bolts 19 are formed at intervals in the paper feeding direction 4 on the mounting portion 20 of the paper.
A pair of guide holes 22 extending along the paper feeding direction 4 are bored in the bottom 7 of the paper feeding cassette main body 3 . The pair of bolts 19 are loosely inserted into the guide holes 22, respectively. The outer diameter of the head 23 of the bolt 19 is the same as that of the guide hole 22.
is larger than the width d perpendicular to the paper feeding direction 4.

By stopping the spring 17 at a position along the sheet feeding direction 4 where the rocking plate 2 receives the optimum spring force and tightening the bolt 19, the head 2 of the bolt 19 is tightened.
3 and the mounting portion 20 of the spring 17, the bottom 7 of the paper feed cassette main body 3 is fixedly pressed. This prevents undesired movement of the spring 17.
Adjust the spring 17 by moving it back and forth in the paper feeding direction 4 to
By fixing the copy paper 2 to the oscillating plate 2,
It is possible to obtain a pressing force between the locking claw 5 and the locking claw 5 according to the quality of the paper 4 (that is, thickness, stiffness, type of high-quality paper, tracing paper, etc.).

Moreover, a guide hole 22 provided in the bottom 7 of the cassette main body 3 and extending along the paper feeding direction 4, and a guide hole 22 provided in the bottom 7 of the cassette main body 3 and extending along the paper feeding direction 4,
7 along the guide hole 22 and means 19 for fixing the spring 17 to the bottom 7 at a desired position along the guide hole 22. As shown in FIG. 3, the strength of the suppressing force can be easily recognized by the fixed position of the leaf spring 17 with respect to the guide hole 22.

That is, for example, when there is no paper in the cassette body 3, it is difficult to know how the suppressing force is adjusted to the paper, and it is necessary to use some kind of measuring device to recognize it.
When the leaf spring 17 is located at the front end of the guide hole 22, as shown in a simplified and exaggerated manner in FIG. When the leaf spring 17 is located at the rear end of the guide hole 22 as shown in Figure 3 (2), it is recognized that the biasing force is increased for use with thick paper, and furthermore, as shown in Figure 3 (3). As shown, the leaf spring 17 is connected to the guide hole 22.
When it is located in the middle of , it can be recognized that the urging force of plain paper, etc. is of average strength. That is, since the strength of the suppressing force can be recognized by the fixed position of the leaf spring 17, the suppressing force can be adjusted without taking the trouble of measuring it.

In the embodiment shown in FIGS. 1 and 2, a plurality of leaf springs 17 (two in each of the above-mentioned embodiments) are provided at intervals in the width direction perpendicular to the paper feeding direction 4. (a) Even if the spring force of the leaf springs 17 is different from each other and there is variation, by adjusting the spring force, the copy paper 24 on the swing plate 2 and each It is possible to set each suppressing force between the locking pawl 5 and the locking claw 5 to the same value, and (b) even when the copy paper 24 is stored unevenly in the width direction on the swing plate 2, the plate spring By individually adjusting the spring forces of 17, it is possible to set the respective suppressing forces on each locking pawl 5 to be equal. This prevents multiple sheets of copy paper from being fed at the same time or from being fed diagonally.

Further, according to the present invention, by visually observing the fixed position of the leaf spring 17 relative to the guide hole 22 provided in the bottom 7 of the cassette main body 3 from below the cassette main body 3, it is possible to determine the suppressing force corresponding to the fixed position. Strength can be easily recognized. As mentioned above, it is necessary to finely adjust such suppressing force depending on the quality of the copy paper 24, and in this respect, according to the present invention,
An excellent effect is achieved in that it is easily possible to fine-tune the suppression force.

Effects As described above, according to the present invention, the suppressing force by the urging means that applies the urging force to the rocking plate of the paper feeding device can be adjusted to the optimum state according to the paper quality of the paper, so that the paper can be loaded at the same time. This prevents multiple sheets from being fed or feeding diagonally, thereby preventing paper jams from occurring.

In particular, in the present invention, by visually observing the fixed position of the biasing means 17 relative to the guide hole 22 provided in the bottom 7 of the cassette main body 3 from below the cassette main body 3, the strength of the suppressing force corresponding to the fixed position can be determined. can be easily recognized. As mentioned above, it is necessary to finely adjust such suppressing force depending on the paper quality of the paper 24. In this respect, the present invention has the advantage that it is possible to easily finely adjust the suppressing force. effect is achieved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a plan view with the swing plate 2 shown in FIG. 1 removed, and FIG. FIG. 3 is a diagram for explaining a pressure adjustment operation. 1... Paper feeding device, 2... Rocking plate, 3... Paper feeding cassette body, 4... Paper feeding direction, 5... Locking claw, 7
... Bottom, 17 ... Leaf spring, 18 ... Spring force adjustment means, 24 ... Copy paper.

Claims (1)

[Claims for Utility Model Registration] At the bottom part 7 of the paper feed cassette body 3, which has a locking claw 5 for separating the paper sheets 24, there is provided a structure that swings around an axis perpendicular to the paper feed direction 4, at the rear of the paper feed direction 4. A swing plate 2 is provided which is movable and on which the paper 24 is mounted,
A paper feed device 1 in which a biasing means 17 for biasing the swing plate 2 upward is provided between the swing plate 2 and the bottom part 7 of the paper feed cassette main body 3, a guide hole 22 provided in the bottom portion 7 and extending along the paper feeding direction 4; a means 18 for movably guiding the biasing means 17 along the guide hole 22 to adjust its movement; and means 19 for fixing to the bottom part 7 at a desired position along the guide hole 22.