JPH0120355Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper feeding device for a copying machine or the like, and more particularly, to a paper feeding device that flips up recording paper in a paper feeding cassette toward a paper feeding unit.

As is well known, in a paper feeding device that flips up recording paper stored in a paper feeding cassette toward a paper feeding unit, a paper feeding cassette as shown in the first figure is used. That is, in FIG. 1, reference numeral 1 denotes a cassette main body which is open at the top, and a flip-up bottom plate 2 is located at the bottom of the cassette main body 1, on which a large number of recording sheets A are stacked. A pair of guide plates 3A and 3B for regulating the feeding direction of the recording paper A are located on both sides of the bottom plate 2. Therefore, the paper feed cassette is inserted onto the paper feed stand 5 of the copying machine 4 or the like from the direction of the arrow X in FIG. The two sheets are flipped up toward the paper feed unit 7 and used. However, there is no problem if the number of sheets of recording paper A accumulated is small in proportion to the depth of the paper feed cassette, but if a large number of sheets of recording paper A are stored in the paper feed cassette as shown in the figure, At the time of flipping up, almost the entire upper recording paper A floats above the guide plates 3A and 3B. Therefore, the upper recording paper A is not regulated by the guide plates 3A and 3B at all, so it is not affected by the vibrations applied to the copying machine 4 or the paper feed unit 7.
The inclination of the paper causes the sheet to be oriented one way in a horizontal plane due to a slight impact, which causes unidirectional paper feeding, resulting in the recording image being oriented one way or a "jam". In order to prevent this kind of situation, a conventional method has been to move the fixing plate 8 located above the paper feed cassette as close to the paper feed cassette as possible to prevent it from floating beyond a certain level. If there is not a certain amount of clearance H between the upper edge of the cassette and the lower surface of the fixing plate 8, the paper feed cassette cannot be inserted or removed easily, so the fixing plate 8 has little effect on preventing the recording paper from floating up. The current situation is that expectations are not met.

In view of the current state of the art as described above, the object of the present invention is to provide a paper feed device that prevents recording paper from being fed in one direction and allows the paper feed cassette to be easily inserted and removed. It has a paper feed tray with a paper feed unit installed therein, a bottom plate that can be inserted into and removed from the paper feed tray and allows the recording sheets to be piled up, and a pair of guide plates that guide the feeding direction of the recording sheets. In a paper feed device such as a copying machine that has a built-in paper feed cassette, the paper feed tray is pivoted at its base end by a shaft provided above the paper feed tray and is biased downward by a spring. a presser member extending toward the back of the paper feed tray; and a presser member provided at a position corresponding to the guide plate at the tip of the presser member so as to be able to contact the upper end of each guide plate when the paper feed cassette is mounted on the paper feed table. A paper feeding device of a copying machine or the like is provided with a pair of protruding stripes.

Embodiments of the present invention will now be described in detail with reference to FIGS. 3 and 4.

FIG. 3 is a sectional view corresponding to FIG. 2 of the paper feeder according to the present invention, and the same structural parts as in FIG. 2 are designated by the same reference numerals. A feature of the present invention is a holding member 9 having a dogleg-shaped cross section and provided on the upper part of the paper feed table 5 facing above the paper feed cassette. This holding member 9 has one end pivotally supported by a shaft 11 supported by a pair of mounting members 10A and 10B.
It is biased in the direction of arrow X by a spring 12 wound around the coaxial shaft 11. The holding member 9 is composed of a vertically inclined sliding part 9a and a holding part 9b which becomes approximately parallel to the paper feeding cassette when the paper feeding cassette is inserted into the paper feeding tray 5, and the holding part 9b is formed on the side of the holding part 9b. is locked to the upper edge of the guide plate 3A. There are two protrusions 1 extending in the width direction of the recording paper A on the lower surface of the presser part 9b.
4A and 14B are integrally formed, and these protrusions 14
The movement of the recording paper A in the width direction is prevented by the contact between the upper edges of the guide plates 3A and 3B and the upper edges of the guide plates 3A and 3B.

Since the above embodiment has the above structure,
Even if a large amount of recording paper A is accommodated in the paper feed cassette, unidirectional paper feeding will not occur. That is, even if many recording sheets A are stored in the paper feed cassette as shown in FIG. Guide plate 3A, 3 located at the same height as the upper edge of
Since the recording paper A in the cassette main body 1 contacts the upper edge of the recording paper B, the guide plate 3A regulates the direction of the recording paper A,
This prevents it from floating above 3B. The contact state of the presser member 9 with the guide plates 3A and 3B is maintained even when the bottom plate 2 is flipped up by the flip-up member 6, as shown in the third figure.
The floating of recording paper A from A and 3B is prevented.
Therefore, the upper recording paper A will not move inadvertently in the horizontal plane due to the vibration of the copying machine or the impact force applied thereto, and the one-sided orientation caused by the one-sided orientation of the recording paper A in the horizontal plane will be prevented. Paper feeding can be prevented. Further, in the present invention, for example, when the cassette body 1 is inserted and set in the paper feeder, even if there is some vertical error or inclination in the insertion position of the cassette body 1, the pressing member 9 always holds the cassette body 1 with the spring 12.
Since the upper edges of both sides of the cassette main body 1 are pressed downward, the upper edge of the cassette main body 1 is reliably pressed downward by the presser member 9, and this has the effect of preventing the occurrence of close contact.

Note that when the paper feed cassette is pulled out from the paper feed table 5, the holding member 9 knocks down the recording paper A held between the paper feed unit 7 into the cassette body 1, so that some of the recording paper A is unloaded. It also has the effect of preventing it from remaining on the paper base 5.

As a result, according to the present invention, it is possible to completely prevent the recording paper from being fed in one direction, and to achieve easy insertion and removal of the paper feed cassette.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of a paper feeding cassette used in a conventional paper feeding device, Fig. 2 is a sectional view of the paper feeding device with the same paper feeding cassette attached, and Fig. 3 is a diagram of a paper feeding device according to the present invention. 2 is a sectional view corresponding to FIG. 2, and FIG. 4 is a perspective view showing the relationship between the holding member and the guide plate. A... Recording paper, 1... Cassette main body, 2... Bottom plate, 3A, 3B... Guide plate, 9... Pressing member, 1
2... Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] Paper feed tray 5 with paper feed unit 7 provided inside
and a paper feed cassette 1 which can be inserted into and removed from the paper feed tray 5 and which includes a bottom plate 2 on which the recording paper A is deposited and a pair of guide plates 3A and 3B that guide the feeding direction of the recording paper A. In a paper feeder such as a copying machine equipped with a paper feeder, the base end is pivotally supported by a shaft 11 provided above the paper feeder 5 and is urged downward by a spring 12. The presser member 9 extended toward
and a pair provided at the tip of the presser member 9 at a position corresponding to the guide plate so that the paper feed cassette 1 can come into contact with the upper end of each of the guide plates 3A, 3B when the paper feed cassette 1 is mounted on the paper feed table 5. A paper feeding device for a copying machine, etc., characterized in that it is provided with protrusions 14A and 14B.