JPH032787B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention provides a feeder for printers, copying machines, etc., in which sheets are stored in a stack in a cassette and the sheets are fed one by one by a feed roller. Regarding paper devices.

(B) Prior art In a paper feeding device that stores sheets stacked in a cassette and feeds the sheets one by one using a feed roller, conventionally the sheets are separated one by one at the corner of the tip of the cassette. It is done with claws.
However, with such a structure, the separating claws are not effective for sheets of different sizes, and can only accommodate sheets of one size.

(C) Object of the Invention An object of the invention is to provide a paper feeding device that has a simple structure and can reliably feed sheets of various different sizes one by one.

(d) Structure of the Invention The structural feature of the present invention is that, in a paper feeding device that stores sheets stacked in a cassette and can feed the sheets one by one by a feed roller, the leading end is moved forward in two stages. A bent claw is erected at the tip of the cassette, and a presser plate whose tip is bent upward and rotates around the rear end is attached to the upper front of the cassette with its tip close to the claw. It is in the point where it was done.

(E) Embodiment FIGS. 1 and 2 show a cassette used in a paper feeding device according to an embodiment of the present invention, in which 1 is a cassette main body, and 2 is a push-up plate dropped into the bottom of the cassette main body. The protruding pieces 2a, 2b at the rear end are loosely penetrated through the bottom of the cassette body 1, and both protruding pieces 2a, 2b
It is rotatable around , and has a notch 3 at a position corresponding to the installation position of a regulating plate, which will be described later. 4, 4 is a separation claw installed inside the tip of the cassette body 1,
The tip portion consists of an oblique side portion 4a bent forward at a certain angle with respect to the upright direction, and a vertical portion 4b whose tip end is further bent in the upright direction. Further, the separation claws 4, 4 are arranged so that the center of the vertical spacing coincides with the center of the feed roller 5 in the width direction, and is located slightly toward the left side plate 1L of the cassette main body 1 toward the front end of the cassette main body 1. There is. Reference numeral 6 denotes a holding plate, which has both protrusions 6a and 6b hanging down on both sides of its rear end.
, it is rotatably supported on the upper portions of both side plates 1L and 1R of the cassette main body 1. At this time, a part of the tip of the presser plate is arranged so as to be close to the separation claws 4, 4, and the tip of the presser plate is placed so as to press the sheet portion in the vicinity of the separation claws 4, 4 most strongly. The distance from the tip of the cassette body 1 becomes wider as the distance from the cassette body 1 increases. Further, the tip of the presser plate 6 is provided with an upwardly bent portion 6', and a notch 7 is provided at a position facing the feed roller 5. Reference numeral 8 denotes a regulating plate disposed at a position corresponding to the notch 3 of the push-up plate in order to regulate the sheets stacked and stored in the cassette body 1 on the right side plate 1R side of the cassette body. The regulating plate has an L-shaped cross section, and its horizontal portion has a slit-shaped hole 9 bored in the bottom of the cassette body 1 so that it can slide freely in the width direction of the sheets stacked and stored in the cassette body 1. is pinned to.

Next, a paper feeding device of the present invention using the above-mentioned cassette will be explained with reference to FIGS. 3 and 4.

The sheet body 10 placed on the push-up plate 2 and regulated by the regulation plate 8 is pushed up together with the tip of the push-up plate 2 by a push-up lever 11 inserted into the cassette body 1. , the top thereof is in contact with the feed roller 5. When the feed roller 5 is rotated clockwise in the same device, the uppermost sheet 12 of the sheet body 10 advances with its leading edge in contact with the oblique side 4a of the separating claw from the vertical side 4b, thereby performing sheet feeding.

Furthermore, the sheet separation operation in the paper feeding device of the present invention will be explained in more detail.

At the top of the sheet body 10, there is a bent part 6' of the presser plate.
The bending points of the press plate 6 are in contact with each other, and the sheet body 10 is pressed by the weight of the press plate 6. In this state, the sheet sent out by the feed roller 5 advances with its leading end in contact with the separating claw 4, and then tries to move upward, but the leading end of the sheet 12 is held at the bent portion 6' of the presser plate. Since the rear part is held down slightly, the sheet 12 is fed forward without moving upward. That is, the sheet 12 sent out by the feed roller 5 is fed while being pressed by the bent portion 6' of the presser plate, with its back surface coming into contact with the leading edge of the separating claw 4.

Even if a plurality of sheets are fed simultaneously by the feed roller 5, the leading edge of the uppermost sheet 12 advances ahead of the leading edge of the lower sheet 13 at the oblique side 4a of the separating claw, and Since the back surface of the sheet 12 is fed while being in contact with the leading edge of the separation claw 4, the lower sheet 13 is reliably separated by the separation claw 4.

Furthermore, sheets of different sizes can be fed in the same manner as described above by sliding the regulating plate 8 to match the sheet size.

Note that the oblique side 4a of the separating claw is preferably bent forward at an angle of 15° to 45° with respect to the direction in which the separating claw 4 is erected, and the bent portion 6' of the holding plate is In order to reliably guide the sheet to be fed forward, it is preferable that it be bent at an angle of 5° to 15° with respect to the holding plate 6.

(F) Effects of the Invention According to the present invention, sheets of various sizes can be reliably fed one by one with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a top view showing a cassette of a paper feeding device according to an embodiment of the present invention, FIG. 2 is a sectional view of the main parts thereof,
FIG. 3 is a sectional view of a main part showing a paper feeding device which is an embodiment of the present invention, and FIG. 4 is an enlarged sectional view of the main part. 1...Cassette body, 4, 4...Separation claw, 6...
...Press plate, 8...Regulation plate.

Claims (1)

[Scope of Claims] 1. In a paper feeding device capable of storing sheets stacked in a cassette and feeding the sheets one by one by a feed roller, a claw whose tip end is bent forward in two stages is attached to the cassette. A holding plate is provided at the front end of the cassette, and the holding plate is bent upward and rotates around the rear end as a fulcrum. Paper feed device.