JPH0355553Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is an automatic feeder that automatically separates and feeds multiple sheets of paper one by one in optical character reading devices, etc. Regarding paper devices.

(b) Prior art As disclosed in Japanese Utility Model Publication No. 57-22272, conventional automatic paper feeding devices include a picker roller for sequentially feeding out multiple stacked sheets of paper, and a paper feeding roller similar to the picker roller. A friction roller system consisting of a separator roller that rotates in the feed direction and a reversing roller that contacts the separator roller with appropriate pressure and rotates at a low speed in the opposite direction to the feed direction is widely used.

In addition, as shown in FIG. 4, a simpler structure includes only a paper feed roller 1 and a friction plate 2 that is in pressure contact with the paper feed roller and is arranged at a predetermined inclination angle with respect to the paper insertion direction. Among the plurality of stacked sheets 3, the friction plate 2 applies a brake to prevent the feeding of sheets other than the lowest sheet,
There was a system in which only the lowest sheets of paper were fed by being sandwiched between rollers and friction plates. An example similar to this method is
It is disclosed in Utility Model Publication No. 61-24512.

(c) Problems to be solved by the invention In the conventional technology, firstly, the former friction roller method requires at least three rollers, making the structure unavoidably complicated, which makes assembly and maintenance time-consuming. There is a problem that it takes

In addition, in the latter method, as shown in FIG. 4, the friction plate 2 was simply fixed to the main body 4 of the device with screws, etc., so there were no problems with the way it was fixed or the way the paper feed roller 1 was attached. As a result, there is a problem that an inclination occurs between the two, which causes the paper to be skewed.

(d) Means for solving the problem The present invention has a structure in which the friction plate is not directly fixed to the device body, but is attached via a mounting plate,
This mounting plate is provided with a protrusion at a portion facing the center line of the friction plate in the paper feeding direction, and the friction plate is swingably attached to the mounting plate using the protrusion as a fulcrum, thereby solving the above problem. This is to solve the problem.

(e) Effect Since the present invention has the above-mentioned structure, even if the friction plate or paper feed roller is tilted when attached, this tilt is absorbed, and therefore the friction plate can evenly cover the paper feed roller surface. It will come into contact with pressure.

(F) Embodiment FIG. 2 is a side view showing an embodiment of the present invention, FIG. 1 is a plan view of the embodiment shown in FIG. 2, viewed from the direction of arrow A.
FIG. 3 is an exploded perspective view showing each component in this embodiment. Although not shown in FIGS. 1 to 3, in this embodiment as well as in the conventional example shown in FIG. 4, the fed paper is transported to the discharge port 7 by two pairs of transport rollers 5 and 6. Ru.

In each figure, reference numeral 8 denotes a rubber paper feed roller which is rotatably driven by a drive source such as a motor and has a large friction coefficient and elasticity; 9 a slightly hard rubber friction plate with a smaller friction coefficient than the paper feed roller 8; and 10 11 is a plate-shaped metal bracket for attaching the friction plate 9 to the main body 4 of the apparatus; 12 is a plate spring between the bracket 11 and the friction plate 9; A metal flat plate holder to be inserted, 13 is a backing plate, 14 and 15 are E-rings 1
Groove 14 for inserting 6, 17, 18, 19
a, 14b, 15a, 15b are formed, respectively, and flanges 14c, 15c are formed at the top of the pins, and insertion holes for inserting the pins 14, 15 are formed in each part, respectively.

The bracket 11 has a portion facing the center line of the friction plate 9 in the direction perpendicular to the roller axis of the paper feed roller 8 in the assembled state as shown in FIG. 2, that is, in the direction in which the paper is fed. , a protrusion 20 protruding toward the back surface of the friction plate 9 is integrally formed, and the insertion holes 21 and 22 for inserting the pins 14 and 15, respectively, are smaller than the diameter of the pins 14 and 15. It is slightly larger, for example, by 0.5 mm.

Therefore, the pins 14 and 15 are sequentially inserted into the insertion holes of the bracket 11, holder 12, leaf spring 10, friction plate 9, and backing plate 13, and the groove 14 of the pin 14
E-rings 16 and 18 are attached to a and 14b, respectively, and E-rings 1 and 1 are attached to grooves 15a and 15b of the pin 15, respectively.
7 and 19, the holder 12 and the backing plate 13 are joined together, and this combined body is suspended from the bracket 11 with a pin.

Further, the bracket 11 is further provided with holes 24 and 25 for inserting the support shaft 23.
The bracket 11 is attached to the apparatus main body 4 by passing the support shaft 23 through this hole and extending the support shaft 23 between the chassis 26 and 27 of the apparatus main body 4.

Incidentally, the apparatus main body 4 has a base section 2 on which the paper feed roller 8 is attached, as in the conventional example shown in FIG.
8 and a lid body part 29, the lid body part 29
has a structure that can be rotated around a shaft 30, and therefore, when the lid portion 29 is opened in the direction of arrow B, the bracket 11 is in a state that it can be rotated around the support shaft 23.

Since a spring 31 that biases the bracket 11 from the back side toward the paper feed roller is fixed to the chassis of the lid body 29 of the apparatus main body 4, when the lid body 29 is closed in the direction of arrow C, the second As shown in the figure,
The friction plate 9 comes into pressure contact with the paper feed roller 8,
Furthermore, pressure is applied to the friction plate 9 only on the center line in the paper feeding direction by the protrusion 20 of the bracket 11. Further, the friction plate 9 is arranged at a predetermined inclination angle with respect to the sheet insertion direction, and this angle is preferably about 10° to 40°. Here, the insertion holes 21 and 22 of the bracket 11 are set to be slightly larger than the diameters of the pins 14 and 15 as described above, and both pins have a diameter that is slightly larger than the diameter of the flange 14.
c, 15c to the first E-ring grooves 14a, 15a
The distance between the height of the protrusion 20 and the bracket 1
Since the distance is set longer than the sum of the plate thickness of 1, the friction plate 9, leaf spring 10, and holder 12
is in a state where it can swing around the protrusion 20 as a fulcrum.

Therefore, even if the friction plate 9 and paper feed roller 8 are not installed completely parallel and are slightly tilted, by swinging around the center line of the friction plate 9 as a fulcrum,
By absorbing this inclination, the entire surface of the friction plate 9 comes into uniform pressure contact with the surface of the paper feed roller 8.

Therefore, uneven contact of the friction plate 9 is prevented, and the paper is correctly fed parallel to the paper feed roller 8 during paper feeding.

(g) Effects of the invention According to the invention, the inclination of the friction plate and paper feed roller can be absorbed with a simple structure, and skewing of paper can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a side view showing this embodiment, Fig. 3 is an exploded perspective view showing this embodiment, and Fig. 4 is a conventional automatic paper feeder. FIG. 8...Paper feed roller, 9...Friction plate, 11...Bracket, 12...Holder, 14, 15...Pin, 20...Protrusion, 23...Support shaft.

Claims (1)

[Scope of utility model registration request] a paper feed roller that is rotationally driven to feed the paper;
In the automatic paper feeding device, which comprises a friction plate that is in pressure contact with the paper feeding roller and is arranged at a predetermined angle of inclination with respect to the paper insertion direction, the automatic paper feeding device separates and feeds a plurality of stacked papers one by one. The friction plate is attached to the main body of the apparatus via an attachment plate, and the attachment plate has a protrusion formed at a portion facing the center line of the friction plate in the sheet feeding direction, and the friction plate is attached to the attachment plate using the protrusion as a fulcrum. An automatic paper feeder characterized in that a plate is swingably attached to the mounting plate.