JPH0244735B2 - KYUSHIKIKO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding mechanism that feeds cut sheets one by one.

[Prior Art] Conventionally, in this type of paper feeding mechanism, paper feeding pick rollers of various shapes have been proposed in order to prevent double feeding of paper, feeding errors, etc. Among these, compared to circular rollers, half-moon-shaped or fan-shaped pit crawlers, such as those described in JP-A-55-160613, feed the paper at the corners of the notches formed in the roller, so they do not require instantaneous feeding force. This has the advantage that the peelability from the second sheet of paper is excellent, and there is no slippage between the roller and the paper, making double feeding and poor feeding less likely to occur.

[Problem to be solved by the invention]

In this type of paper feeding mechanism, it is necessary to make the notch of the pick roller face the paper before starting the paper take-out operation. For this purpose, an electromagnetic clutch is provided between the pick roller and its drive motor to interrupt rotational transmission, and after one revolution of the roller, the roller is stopped at a position where the notch faces the paper. Therefore, this is a factor that increases costs and takes up space.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding mechanism that can maintain a pick roller at a stopped position with a simple mechanism.

[Means to solve the problem]

The paper feeding mechanism of the present invention includes a friction member that is always held at a certain distance above the top surface of a cut paper mounted on a paper holder, and a friction member that is provided at a position facing the friction member of a pick roller. When the notch faces the cut paper surface, it contacts the friction member, and when the other pick rollers are in rotational positions, the braking part and the pick roller, which are separated from each other, contact the paper feed roller to prevent the top layer of cut paper from peeling off. It is constructed of a driving means that drives the cut paper until it is engaged, and a one-way latch that transmits the driving force of the driving means to the pick roller.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the paper feeding mechanism of this embodiment is as follows:
Paper feed roller 8 provided with two rollers in contact with each other
, a paper pick crawler 1 (hereinafter referred to as a pick crawler) with a notch formed therein, a paper pick crawler shaft (hereinafter referred to as a pick crawler shaft 2) that supports this pick crawler 1 and transmits rotational force, and a paper that stacks and holds cut paper 5. A holder 7 and a spring member 6 that presses the cut paper against the pick roller 1 via the paper holder 7.
, a claw lever 3 for pressing the cut paper against the paper holder 7 in order to maintain the stacked state of the cut paper, and a friction member 4 provided on the claw lever 3.

The pick roller shaft 2 is driven clockwise in the figure from a drive source via a one-way clutch.
Therefore, when the drive source is stopped, the pick roller 1 freely rotates in the clockwise direction without resistance, but in the opposite direction, it is subjected to resistance sufficient to rotate the stopped drive source.

In the initial state (FIG. 1), which will be described later, the pawl lever 3 presses only the two corners of the cut paper in the feeding direction with a weak force similar to its own weight. Accordingly, when the cut paper is sent out in the feeding direction by the pick roller 1, only one cut paper in the uppermost layer is detached, and the remaining cut papers maintain this state.

The friction member 4 provided on the pawl lever 3 is always at a constant distance from the top of the stacked cut paper. This distance is shorter than the distance from the circular arc surface of the pick roller 1 to the side surface of the pick roller shaft 2, and longer than the distance from the notch surface of the pick roller 1 to the side surface of the pick roller shaft 2.

Therefore, when the notch surface of the pick roller 1 is facing the cut paper surface, the friction member 4 is in contact with the side surface of the pick roller shaft 2, and when the arc of the pick roller 1 is in contact with the cut paper surface, the friction member 4 is in contact with the side surface of the pick roller shaft 2.
is separated from the pick crawler shaft 2.

That is, in this embodiment, the pick roller shaft 2 is used as the above-mentioned braking section.

Referring to FIG. 2, the pick crawler 1 will be explained.

In the embodiment shown in FIG. 1, type A is introduced, but this embodiment is not limited to this type. In order to cause the friction member 4 to act as described above,
A part of the roller needs to be cut out, and a corner-shaped part is needed at both ends. B is another embodiment that meets this condition. In the following description, A will be used, and the left corner of the drawing will be referred to as the first corner, and the right corner will be referred to as the second corner.

Next, the operation of this embodiment will be explained with reference to FIG.

The paper feeding mechanism, which is waiting in the initial state shown in FIG. 1, rotates the pick roller 1 in the clockwise direction as the paper feeding operation starts. At this time, the friction member 4 provided on the pawl lever 3 contacts the pick roller shaft 2 and applies a brake, but this rotational drive is caused by the frictional force and the rotation is performed once.

The pick roller 1 rotates and presses its second corner against the uppermost cut sheet (hereinafter referred to as conveyed sheet) (i).
As the rotation continues, the second corner removes the conveyed paper from the pawl lever 3 with an instantaneous strong frictional force and pushes down the paper holder 7, resulting in the friction member 4 being removed from the pick crawler shaft 2. leave (ii) The conveyed paper is sent out as the pick crawler 1 rotates.
(iii). The conveyed paper then reaches the paper feed roller 8, but since the paper feed roller 8 is stopped at this point, the driving of the pick roller 1 causes the conveyed paper to slacken slightly. Due to this slack, the front edge of the conveyed paper is aligned between the two paper feed rollers 8.
(iv). When this state is reached, the paper feed roller 8 starts rotating, and at the same time the drive of the pick roller 1 is stopped, and the paper is transported by the paper feed roller 8 (v). The conveyed paper is pulled by the paper feed roller 8, but the pick roller 1 is in contact with the conveyed paper with a pressing force from a spring member, and because it is a one-way clutch,
Since the rotation in the conveying direction is also released from the resistance of the drive source, the pit crawler 1 is rotated by the friction of the conveyed paper (vi). When the conveyed paper is further fed and the pick roller 1 rotates accordingly, the pick roller 1 comes to a position where the first corner comes into contact with the conveyed paper and the notch faces the paper surface. Accompanying this, the claw lever 3 rises, and the friction member 4 contacts the pick roller shaft 2 to apply the brake (vii). The pick roller 1 stops rotating at a position where the frictional force between the conveyed paper and the pick roller 1 is balanced with the frictional force between the friction member 4 and the pick roller shaft 2. That is, the pick roller 1 maintains its initial state (FIG. 1), and the conveyed paper is conveyed by the paper feed roller 8.
The conveyance of one cut paper is completed.

[Effects of the Invention] As described above, the present invention has the effect of providing a paper feeding mechanism that is simple and can operate stably.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a paper feeding mechanism according to an embodiment of the present invention, FIG. 2 is a sectional view showing a paper pick roller,
FIG. 3 is a side view showing the paper feeding operation. 1... Paper pick roller, 2... Paper pick roller shaft, 3... Pawl lever, 4... Friction member, 5...
... cut paper, 6 ... spring member, 7 ... paper holder,
8...Paper feed roller.

Claims (1)

[Scope of Claims] 1. A paper holder on which cut paper is laminated and mounted, a pick roller having a notch that is pivotally supported above the paper holder, and the uppermost layer of cut paper mounted on the paper holder. and a pressing means for pressing the pick roller against the pick roller, and in the paper feed mechanism that feeds the cut paper one by one to the paper feed roller, the cut paper mounted on the paper holder is always placed at a certain distance above the top surface. a friction member held at a position opposite to the friction member of the pick roller, which contacts the friction member when the notch of the pick roller faces the cut paper surface; a braking unit that is separated from the pick roller at its rotational position; a driving means for driving the pick roller from peeling off the uppermost layer of cut paper until the cut paper engages with the paper feed roller; A paper feeding mechanism comprising a one-way clutch that transmits driving force to the pick roller.