JPH0289739A - Paper feeding device for office equipment - Google Patents

Abstract

PURPOSE:To display high paper separating performance by fixing a friction member being in contact with a paper separating roller at a spring member and holding the one end of this spring member at the holding part of a holder and the other end at the holding part of a pressing arm. CONSTITUTION:A friction member 29 being in contact with a paper separating roller 13 is fixed at a spring member 25, and the one end of this spring member 25 is held at the holding part 18 of a holder 15 and the other end at the holding member 28 of a pressing arm 20. Accordingly, the whole friction member 29 is pressed to the peripheral surface of the paper separating roller 13, so that the pressing force of the center part of the friction member 29 becomes also large, resulting in effective action upon paper separation. Paper separating performance is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device for office equipment such as facsimiles and copying machines.

Conventional technology Conventionally, a paper feed device for office equipment that separates a large number of sheets of paper one by one is composed of a paper separation roller and a friction plate that is pressed against the paper separation roller. In order to increase this, for example, as described in Japanese Utility Model Publication No. 61-24512, a friction plate is pressed against a paper separating roller at two different points by a first pressing member and a second pressing member.

That is, as shown in FIG. 5, a paper separation roller 2 is disposed at the end of the paper feed table 1, and a friction piece 3 made of a rubber material or the like is bonded to the outer periphery of the paper separation roller 2. . The tip of this friction piece 3 is pressed against the paper separation roller 2 by a first pressing member 5 formed by a pressing plate 4, and the base side of the friction piece 3 is connected to a pressure adjusting screw 7 screwed into the chassis 6. It is pressed against the paper separation roller 2 by a second pressing member 9 formed by a spring 8 .

Then, a large number of stacked sheets of paper placed on the paper feed tray 1 are inserted along the outer circumference of the paper separation roller 2, and are separated into one sheet between the outer circumference of the paper separation roller 2 and the friction piece 3. separated and sent out. That is, the sheets other than those located at the lowest position sequentially come into contact with the friction piece 3 and are stopped from being fed, and only the sheets located at the lowest position are fed out. Therefore, the frictional force between the friction piece 3 and the paper is greater than the frictional force between the papers, and is smaller than the frictional force between the paper separation roller 2 and the paper.

Problem to be Solved by the Invention Since the friction piece 3 is in contact with the outer peripheral surface of the paper separating roller 2 between the first pressing member 5 and the second pressing member 9, the contact area seems to be large. However, the external force acts only at the two points where the first pressing member 5 and the second pressing member 9 are located, and the paper separation function at the intermediate portion is low.

Therefore, in reality, paper separation is only performed at two locations, and the performance of separating overlapping sheets is weak between the first pressing member 5 and the second pressing member 9. However, the overall separation performance is not necessarily satisfactory.

Means for Solving the Problems A paper separation roller connected to and driven by a drive unit, an elastic thin plate-shaped spring member curved along a part of the outer periphery of the paper separation roller, and a spring member of the spring member. a friction member fixed to the inner surface and pressed against the outer periphery of the paper separation roller;
a holder that is biased in the direction of the paper separation roller and is rotatably attached to the support shaft and includes a holding portion that holds the tip of the spring member; a pressing arm having a retaining member attached thereto and retaining the rear end of the spring member.

The friction member that comes into contact with the working paper separation roller is fixed to a spring member, and this spring member has one end held by the holding part of the holder and the other end held by the holding member of the pressing arm. The entire member is pressed against the outer circumferential surface of the paper separation roller, and as a result, since the pressing force at the center of the friction member is large, it acts effectively for paper separation, improving paper separation performance.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 3. First, a paper feed table 12 that holds a large number of stacked sheets of paper 11 is provided, and at the tip of this paper feed table 12, a paper separation roller 13 driven by a drive unit (not shown) rotates with a horizontal axis. It is set up so that it can move freely.

Further, a support shaft 14 fixed to a fixed portion such as a chassis (not shown) is provided, and a holder 15 is rotatably attached to this support shaft 14. This holder 15 is biased downward by a compression spring 17 disposed between it and a fixing part 16, and a holding part 1 cut out in a figure 7 shape is formed on the lower surface of the tip of the holder 15.
8 is formed. Further, a pressing arm 20 rotatably attached to a support shaft 19 is provided at the intermediate portion of the holder 15 . An extending portion 21 extending rearward is formed on the upper surface of the pressing arm 20, and a compression spring 22 is provided between the extending portion 21 and the holder 15, so that the pressing arm 20 is Forced clockwise. Further, a pipe 24 serving as a holding member having a slit-shaped opening 23 is fixed to the lower end of the pressing arm 20 in a hanging manner.

Next, an elastic thin plate-shaped spring member 25 made of a steel plate or the like is provided.
is provided. At one edge of this spring member 25, holding pieces 26 are provided which are alternately bent into arc shapes in different directions.
are formed, and stopper pieces 27 are formed on the other edge, which are alternately bent at right angles in different directions. The chip 2 is brought into contact with the stopper piece 27 and is engaged with the holding portion 18 on the front and back sides of the spring member 25.
8 are integrally fixed by screws or the like (not shown).

A plate-shaped friction member 29 made of an elastic member such as rubber is fixed to the inner surface of the spring member 25 formed in this manner by means of adhesive or the like, thereby forming an elastic friction plate 30.

The elastic friction plate 30 formed in this manner is fixed by inserting the holding support piece 26 of the spring member 25 into the pipe 24 and inserting the fixing shaft 31 from the axial direction. . Further, the tip 28 is engaged with the 7-shaped holding portion 18 of the holder 15.

In such a configuration, the paper separation roller 13 is rotationally driven in the direction of the arrow in FIG. drawn out. When the position where the friction member 29 is located is reached, the stacked sheets of paper 11 are separated into one sheet and sent out.

Thus, the tip 28 formed on one edge of the spring member 25 holding the friction member 29 engages with the holding portion 18 of the holder 15, and this portion receives a downward force. Further, the other edge of the spring member 25 is held by the pipe 24, and the pressing arm 2o is held by the pipe 24.
4 is urged in a direction opposite to the feeding direction of the paper 11. Since the external force is applied to the spring member 25 in this way, the contact state of the friction member 29 with the outer periphery of the paper separation roller 13 is such that the pressing force effectively acts over the entire area from the center to the edge. . Therefore, the paper 1
1, but even if complete separation is not possible at that position, the range of contact between the paper separation roller 13 and the friction member 29 is large, and the friction member 29 covers the entire contact range. is effectively pressed against the paper separation roller 13, so that the paper 11 can be separated within any range of the friction member 29. In other words, since the paper separation function is provided over the entire length of the friction member 29, even if the paper sheets 11 are fed overlapped, the paper 11 is separated into one sheet while being fed within the range of the friction member 29. It is.

When such a separation action is performed, the pressure at the entrance to the contact portion of the friction member 29 is regulated by the force of the compression spring 22 urging the pressing arm 20, and
Since the pressing force of the friction member 29 itself against the paper separation roller 13 is regulated by the force of the compression spring 17 that presses the holder 15, it is easy to set the force relationship of each part necessary for paper separation.

In addition, a large number of sheets of paper are connected to the friction member 29 and the paper separation roller 1.
3, the pressing arm 20 rotates against the pressing force of the compression spring 22 and releases the friction member 29, so that the paper 11 does not jam. Even in such a case, the tip side of the friction member 29 is pressed against the paper separation roller 13 by receiving the force from the holder 15, so that
There is no risk that the paper separation function will deteriorate.

Effects of the Invention As described above, the present invention comprises a paper separation roller that is connected to a drive unit and driven, an elastic thin plate-like spring member that curves along a part of the outer periphery of the paper separation roller, and a friction member fixed to the inner surface of the spring member and pressed against the outer periphery of the paper separation roller; and a friction member that is biased toward the paper separation roller and rotatably attached to the support shaft and holds the tip of the spring member. Since the holder is provided with a holding portion and the pressing arm is provided with a holding member that is biased in one direction, is rotatably attached to the holder, and holds the rear end of the spring member, the paper separation roller The friction member that comes into contact with
It is fixed to a spring member, and one end of this spring member is held by the holding part of the holder, and the other end is held by the holding member of the pressing arm, so that the entire friction member is attached to the outer peripheral surface of the paper separation roller. As a result, since the pressing force at the center of the friction member is large, it acts effectively for paper separation, and has the effect that high paper separation performance can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, FIG. 2 is a perspective view of a part thereof, FIG. 3 is a side view showing a spring member in an expanded state and the mounting structure of one end thereof, and FIG. 4 is a side view showing an example of the present invention. A plan view of a spring member,
FIG. 5 is a side view showing a conventional example. 13...paper separation roller, 15...-holder, 18...
... Holding part, 20... Pressing arm, 25... Spring member, 28... Holding member, 29... Friction member - Atsushi Z diagram

Claims (1)

[Claims] A paper separation roller connected to and driven by a drive unit, an elastic thin plate-shaped spring member that curves along a part of the outer periphery of the paper separation roller, and a sheet separation roller fixed to the inner surface of the spring member to separate the paper. a friction member pressed against the outer periphery of the roller;
a holder that is biased in the direction of the paper separation roller and is rotatably attached to the support shaft and includes a holding portion that holds the tip of the spring member; A paper feeding device for office equipment, comprising a pressing arm having a holding member attached thereto to hold the rear end of the spring member.