JPH0544340Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Industrial application field The present invention loads paper on a loading plate, stores it in a cassette case, and presses the loading plate against a paper feed roller using a biasing means. , relates to a paper feeding device that feeds paper.

(B) Conventional technology In the past, as in Utility Model Application No. 56-92632, a pin was protruded from a mounting plate and fitted into a groove provided in a cassette case, and as the number of sheets decreased due to paper feeding, the mounting plate was fixed. A paper feeding device is known in which the tip of the plate is prevented from retreating and the separation claw is always engaged.

(C) Problems to be solved by the invention However, according to this prior art, although the separation performance of the separation claw is kept constant, the inclination angle at which the paper on the mounting plate contacts the paper feed roller is As the amount of paper decreases, the speed increases gradually, so the paper feeding performance has the disadvantage of not being able to be kept constant. In other words, as the pressure angle between the paper feed roller and the paper becomes steeper, slips may occur during paper feeding and the paper may not be fed, or even if the paper is fed, the paper may be fed later than the paper feeding timing. A situation may occur where this occurs. In addition, the paper may become difficult to separate from the separation claw, resulting in a paper jam. Furthermore, there is a problem in that the paper is not conveyed smoothly due to frictional force caused by the paper coming into contact with the guide plate that guides the paper downstream from the paper feed section.

Therefore, it is desirable for the board to move vertically while maintaining its horizontal position.In the past, there were devices that moved the board vertically while maintaining its horizontal position, but motors, chains, etc. Since it was moved, the structure was complicated and expensive.

Therefore, an object of the present invention is to provide a paper feeding device that has a simple configuration and has constant paper feeding performance.

(D) Means for Solving the Problems Therefore, the paper feeding device according to the present invention uses a biasing means to urge the loading plate in the cassette case loaded with paper, so that the paper is transferred to the paper feeding roller. In a paper feeding device that feeds paper by pressing the board, the mounting plate is configured from a first horizontal part, an inclined part, and a second horizontal part in order from the downstream side to the upstream side in the conveying direction, They are joined together by a joint, and a rear end regulating portion is provided upright from the upstream end of the second horizontal portion, and the urging means is located approximately in the center of the first horizontal portion in the conveyance direction. The first horizontal part is in a horizontal state, and a pin is provided that protrudes laterally from the first horizontal part, and a vertical long groove is provided in the side part of the cassette case for fitting the pin. The movement of the first horizontal part in the horizontal direction is restricted, and as the number of sheets decreases, the pin is guided to the long groove by the urging force of the urging means, so that the first horizontal part is characterized in that movement in the horizontal direction is restricted and the paper rises while maintaining a horizontal state, and as the first horizontal part rises, the second horizontal part moves downstream in the paper conveyance direction. It is something.

(E) Effect When the paper is fully loaded, the first horizontal portion is in a horizontal state and is lowered against the biasing force of the biasing means, and the slope is also gentle. . The second horizontal portion is closer to the upstream side in the conveyance direction.

As the paper is fed and reduced, the mounting plate
It rises due to the urging force of the urging means. At this time, in the first horizontal part, the first pin is guided by a vertical long groove provided in the cassette case, and the biasing means is located approximately in the center of the first horizontal part in the conveying direction. Because of this, movement in the horizontal direction is restricted and it rises while maintaining a horizontal state.

Further, as the number of sheets decreases, the inclination angle of the inclined portion becomes steeper, and accordingly, the second horizontal portion and the trailing edge regulating portion move toward the downstream side in the conveyance direction.

(F) Embodiments Therefore, the paper feeding device according to the present invention will be described in detail next with reference to the drawings.

FIG. 1 is a sectional view of a paper feeding device according to the present invention. The paper feeding device, which is generally designated by 1, includes a box-shaped cassette case 2, a mounting plate 3 for placing paper P, and a mounting plate 3 for placing paper P thereon. The upper surface of the paper P comes into contact with the urging means 4 that urges upward, and the upper surface of the paper P is pressed against the upper surface of the paper P.
It consists of a paper feed roller 5 for feeding the paper, and a separating claw 6 for separating the paper so that the paper is fed one by one when the paper is fed by the paper feed roller 5.

In the present invention, the mounting plate 3 consists of a first horizontal part 3a, an inclined part 3b, and a second horizontal part 3c in order from the downstream side to the upstream side in the paper conveyance direction, and each is connected to a joint member. Jointed by 3d and 3e. Also, the second horizontal part 3
A rear end regulating portion 3h is erected from the upstream end of c. The biasing means 4 is located approximately in the center of the first horizontal portion 3a in the conveyance direction. Further, first pins 3f, 3f protrude from the first horizontal portion 3a toward the side of the cassette case 2, and are fitted into vertical long grooves 2a, 2a provided on the side of the cassette case 2. are doing. Similarly, a second pin 3g projects from the second horizontal portion 3c toward the side of the cassette case 2, and is fitted into a horizontal long groove 2b provided on the side of the cassette case 2. There is.

Therefore, when a large number of sheets of paper P are loaded on the loading board 3, the first horizontal portion 3a of the loading board 3 moves downward against the urging force of the urging means 4, as shown by the solid line. It is located in Further, the slope portion 3b has a gentle slope, and the rear end regulating portion 3h is also located at the rear. At this time, the first pin 3f is connected to the long groove 2.
The second pin 3g is located in the lower part of the long groove 2
It is located at the rear of b.

As the paper P is fed one after another by the paper feed roller 5 and decreases in size, the first horizontal portion 3a
Due to the urging force of the urging means 4, it rises in the direction of arrow A. At this time, the first pin 3f is guided by the vertical long groove 2a, and the biasing means 4 is located approximately in the center of the first horizontal portion 3a in the conveying direction. 3a rises while maintaining a horizontal state. Further, as the first horizontal section 3a rises, the inclination angle of the inclined section 3b becomes steeper, and the second horizontal section 3c moves in the direction of arrow B accordingly. At this time, the second pin 3g is guided by the horizontal long groove 2b, so the second horizontal portion 3c is
Move horizontally to the downstream side in the transport direction. Along with this, the rear end regulating portion 3h also moves downstream in the conveyance direction. As a result, the board 3 is in the state shown by the two-dot chain line.

As described above, according to the paper feeding device 1 according to the present invention, as the number of sheets of paper P decreases, the first horizontal portion 3a of the mounting plate 3 is restricted from moving in the horizontal direction, and while maintaining the horizontal state. At the same time as moving upward, the trailing edge regulating section 3h horizontally moves downstream in the conveyance direction, which not only prevents the portion of the paper P from being caught on the separation claw 6 but also prevents the paper from reaching the paper feed roller 5. P can always be brought into contact in a horizontal state.

In the above embodiment, the first pin 3f and the second pin 3g are provided separately from the joint members 3d and 3e, but as shown in FIG.
The first pin 3f can be formed by extending toward the side of the cassette case 2, and the second pin 3g can also have a similar structure.

Furthermore, the second pin 3g may be made to protrude toward the bottom of the cassette case 2, and the horizontal long groove 2b may be provided at the bottom of the cassette case 2.

It should be noted that if the second pin 3g and the horizontal long groove 2b are present, the second horizontal portion 3c can move horizontally smoothly, but they are not necessary.

(G) Effects of the invention As is clear from the above, the paper feeding device according to the invention moves the loading plate from the downstream side to the upstream side in the conveyance direction in order from the first horizontal part, the inclined part, and A second horizontal part is provided with a pin projecting laterally from the first horizontal part, and a vertical long groove for fitting the pin is provided in the side part of the cassette case. Since the movement of the first horizontal part in the horizontal direction is restricted, even if the number of sheets decreases, the pin is guided by the long groove, so that the movement of the first horizontal part in the horizontal direction is restricted. The paper is raised while maintaining a horizontal state, and as the first horizontal part rises, the second horizontal part moves downstream in the paper transport direction, so that the paper is always pressed against the paper feed roller in a horizontal state. In addition, since the contact portion between the paper and the paper feed roller is always the same, the pressing force of the paper against the paper feed roller is always constant, and stable paper feed performance can be obtained with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the paper feeding device according to the present invention, and FIG. 2 is a sectional view of the first pin 3 in another embodiment.
It is a top view which shows the principal part near f. P...paper, 1...paper feeder, 2...cassette case, 2a...vertical long groove, 3...mounting plate, 3a...first horizontal part, 3b...inclined part, 3
c...Second horizontal portion, 3d, 3e...Joint member, 3f...First pin, 3g...Second pin, 3h...Rear end regulating portion, 4...Biasing means, 5...
...Paper feed roller.

Claims (1)

[Scope of Claim for Utility Model Registration] A paper feeding device that feeds paper by urging a loading plate in a cassette case loaded with paper with an urging means to press the paper against a paper feeding roller, The mounting plate is composed of a first horizontal part, an inclined part, and a second horizontal part in order from the downstream side to the upstream side in the conveyance direction, and each of them is joined by a joint, and the upstream side of the second horizontal part is A rear end regulating portion is provided upright from the end portion, and the urging means is positioned approximately in the center of the first horizontal portion in the conveyance direction to bring the first horizontal portion into a horizontal state. A pin is provided that protrudes laterally from the horizontal portion, and a vertical long groove for fitting the pin is provided in the side of the cassette case to restrict movement of the first horizontal portion in the horizontal direction. However, as the number of sheets decreases, the pin is guided into the long groove by the urging force of the urging means, so that the first horizontal portion is restricted from moving in the horizontal direction and is kept in a horizontal state. The paper feeding device is characterized in that the second horizontal portion moves downstream in the paper conveyance direction as the first horizontal portion rises.