JP2749170B2 - Separation mechanism of media issuing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a medium separation mechanism in a medium issuing device, and more particularly to a high performance and small size separation performance.

[Conventional technology]

As a conventional separating mechanism, there has been a method in which a friction roller is pressed against the lowermost medium in a hopper and rotated one by one, as shown in JP-A-55-156140. In this method, if the friction coefficient of the friction roller is increased, good performance of the medium itself can be obtained,
In an apparatus in which this kind of hopper is continuously connected and the medium taken out of another hopper passes through this friction roller portion, the medium taken out of the other hopper enters later, so Of medium, and it is easy to cause double feed. In order to prevent this, it is necessary to separately provide a draw-out roller and to return the stacking medium to its original position and remove it from the friction roller after drawing out one sheet. As another method, it is necessary to form a separate transport route without allowing the medium taken out from another hopper to pass through the friction roller portion.

Both of these methods have the drawback that the structure of the mechanism is complicated and large.

[Problems to be solved by the invention]

The above-described prior art can secure high reliability as the separation performance, but has difficulty in realizing the small size of the apparatus. An object of the present invention is to provide a separation mechanism that can satisfy the high reliability of the separation performance and can be downsized.

[Means for solving the problem]

In order to achieve the above object, 1) prevention of double feed In order to transport only the bottom medium by the separation roller,
Plural when the friction coefficient mu _R of the medium and the separation roller, but are higher than the frictional coefficient mu _P between media, mu _P is or have raised or extremely mu portion _P is smaller part due to variations May be extracted at the same time. Because of this,
Provide a high coefficient of friction surface on the slope of the separation gate, and when more than one medium rushes into this surface, the medium other than the bottom receives frictional resistance and brakes and stops, so that only the bottom medium is discharged . For this purpose, a slope having a predetermined height is provided in front of the separation gate so that the lowermost medium is guided so as to hit the high friction coefficient surface of the slope of the gate.

Further, in the above, since μ _P is very high or the dispersion is very large, it cannot be separated into one piece on the separation gate slope, and when two pieces try to pass through the gate, the high friction coefficient surface on the lower surface of the gate becomes large. And only the upper medium is stopped by receiving a large frictional resistance between the members (for example, rollers) facing thereto and having a low coefficient of friction, and only the lower medium can be drawn out.

As described above, the two-stage double feed prevention mechanism ensures that 1
Separation of only one sheet can be performed.

2) Prevention of scratching and curling of the medium 1) In order to prevent double feeding, it is desirable that the friction coefficient of the slope of the separation gate is high, but if it is too high, the frictional resistance becomes too large and the medium is damaged or turned. There is a risk of occurring. Further, since the medium above the medium to be unwound hits the slope of the separation gate more than once, it is repeatedly scratched. For this reason, a position where a medium other than the lowermost medium hits the slope of the separation gate is set as a surface having a small friction coefficient, so that the position is smoothed as a "hit", thereby preventing turning over.

(Operation)

The high coefficient of friction surface of the separation gate slope applies a frictional resistance to the head of the medium because only the lowermost medium of the extracted medium is sent to the lower surface of the gate.

The slope in front of the separation gate guides the medium such that when the leading portion of the extracted medium reaches the gate slope, it strikes the high friction coefficient surface of the slope. Also, the medium above the lowermost medium to be extracted guides the medium so as to hit the low friction coefficient surface of the slope.

The low coefficient of friction surface of the separation gate slope provides a smooth surface so that the media above the bottom bottom repeatedly hits the separation gate slope without damaging or turning over the bond. The material on the lower surface of the separation gate is made of a material with a low coefficient of friction and is pressed with pressure, so when two media overlap and enter, the upper medium stops due to the difference in friction coefficient with the lower surface of the separation gate, and the lower medium stops. Is separated and transported.

As described above, only the lowermost medium can be separated, and the upper medium can be prevented from being damaged.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a side view of a hopper section of the medium issuing apparatus of the present invention. Each hopper 8a to 8c is a medium stored for each hopper.
Roller 3a for forming 4a to 4c one by one from below
3c, and weights 5a to 5c for pressing the mediums 4a to 4c against the drawing rollers 3a to 3c and also generating a necessary conveying force at the time of drawing. Separation gates 1a to 1c for separating the ejected medium into one sheet, pressing rollers 7a to 7c pressed against the separation gates 1a to 1c at a constant pressure, and before the separation gates 1a to 1c. Slope 2a ~ 2c for transporting the ejected medium to the predetermined position on the separation gate slope
It has.

The general operation at the time of medium issuance will be described below. A case where a medium is issued from the hopper 8a will be described as an example.

When the draw-out roller 3a rotates in the direction of arrow A using a motor (not shown) as a drive source, the medium deposited on the hopper 8a
The lowermost medium 41 of 4a is transported in the direction of separation gate 1a. Here, compared to the friction coefficient mu _P between the medium of the medium 4a, feeding rollers 3a and since the friction coefficient mu _R of the medium are selected the material of the roller 3a and feeding to be larger, the bottom medium 41 is most is conveyed, upper medium other than the lowermost medium 41 under the influence of mu _P (to be described later 42, 43) more or less is transported to the isolation gate 1a direction. In general, μ _P = 0.3 to 0.5, μ
_R = about 1 to 1.3, and the drawing roller 3a uses natural rubber or the like. Medium 41-43 conveyed to separation gate 1a
Is separated by the separation gate 1a and the pressing roller 7a in accordance with the principle described later in detail, and is transported by the transport roller 6a to the next hopper 8b below the deposition medium 4b. The medium 41 conveyed to the hopper 8b is sent to the hopper 8c in the same manner as described above in the hopper 8b. The same operation is performed in the hopper 8c, and the operation of extracting the predetermined medium from the hopper is completed. In this series of operations, what is necessary for the separation performance is that there is no simultaneous feeding of a plurality of media (hereinafter referred to as W feed), and the issuing medium is not damaged or turned up by the separating mechanism (this Mistake out:
It leads to a non-pick).

The enlarged second embodiment of the separation mechanism, which is the main part of the present invention,
This will be described in detail below with reference to FIG.

FIG. 2 shows a state immediately after the medium 41 has been extracted from the hopper 8a. The separation gate 1a has an inclined portion of about 45 ° in a shape to allow the medium to be conveyed, and the upper portion 1a ₁
Is low, such as friction coefficient of the metal surface (mu ≒ 0.2 or less) plane, toward the bottom from the lower part, such as the coefficient of friction of the urethane rubber is composed of a high (mu ≒ 0.1) face 1a _2. A pressing roller 7a made of a material having a low friction coefficient (μ （0.2 or less) is pressed against the bottom surface at a predetermined pressure.

Further, the front of the isolation gate 1a, bottom medium 41, for guiding to reach the high coefficient of friction surface 1a ₂ of the isolation gate slope, there is a slope 2a having a certain angle.

As described above, when the draw-out roller 3a rotates, not only the lowermost medium 41 but also the media 42, 43,... On the lowermost medium 41 are pushed forward, and a plurality of sheets are conveyed toward the separation gate slope. Here, the bottom medium 41 is reliably reach the isolation gate 1a high coefficient of friction surface 1a ₂ of the slope, in the medium (drawings Examples of the number of sheets 4
4-46) is as to reach the low coefficient of friction surface 1a _1, is set the slope 2a height, inclination.

As a result, the medium 43 above the lowermost medium 41, the head portion to the high friction coefficient 1a ₂ slopes of the separation gate 1a abuts, and braked by the frictional resistance, the bottom medium 41 Is sent to the bottom surface of the separation gate 1a, and W feed is not performed.

Also, since the medium 44, 45, 46, etc. of the upper layer reaches the low friction coefficient surface, it does not receive a large frictional resistance,
If the top part hits the high friction coefficient surface many times,
No more turning over.

By the majority of the media, but is separated into one sheet by the slope of the isolation gate 1a, or the coefficient of friction mu _P is significantly higher among media, enters two sheets to the separation gate underside simultaneously when the variation is significantly greater There is a risk. The separation principle and operation in such a state will be described below with reference to FIG.

FIG. 3 shows that the lowermost medium 41 and the medium 42 thereon are simultaneously
This shows a state where it has entered the lower surface of the separation gate 1a. The two media 41 and 42 that have entered try to pass through the press contact roller 7a while pushing down the press contact roller 7a,
41 compared with the friction coefficient ▲ mu ^'R ▼ of, the friction coefficient mu _g of isolation gates lower surface of the high friction coefficient surface 1a ₂ and the medium 42 is large, the upper media 42 only the lowermost medium 41 stops in this section Separated and transported.

Instead of the pressing roller 7a, a member having an angle for receiving the medium, such as an arc or a slope, such as the roller 7a may be used.

As described above, the medium can be separated at two places, the inclined surface and the lower surface of the separation gate, so that the W feed can be prevented.

FIG. 4 is a perspective view of the separation gate of this embodiment, and FIG.
The figure shows an example of the low friction coefficient surface configuration of the separation gate slope.
The isolation gate underside 1a ₂ extend up slopes upward, in the upper part, an example of a case where achieve this pasted Teflon tape. Further, the entry portion 50 on the lower surface of the gate may be an arc.

〔The invention's effect〕

According to the present invention, the separation action can be performed in two stages, which has the effect of preventing W feed. In addition, since a part of the slope of the separation gate has a low coefficient of friction, it is repeatedly used many times. Even if the medium enters the slope of the gate, the medium is not damaged.

In addition, since it can be easily realized by a combination of conventional mechanical components, a small-sized device can be realized without increasing the size of the device.

[Brief description of the drawings]

FIG. 1 is a side view of a hopper showing an embodiment of the present invention, and FIG.
FIGS. 3 and 3 are side views of a separation mechanism showing one embodiment of the present invention, FIG. 4 is a perspective view showing a separation gate of one embodiment of the present invention, and FIG. 5 is another embodiment of the present invention. It is a perspective view which shows a separation gate. 1a to 1c: Separation gate, 1a ₁ ... Low friction coefficient surface of separation gate, 1a ₂ ... High friction coefficient surface of separation gate, 2a to 2c
Slope, 3a to 3c ... Roll-out roller, 4a to 4c ... Medium, 5a to 5c ... Weight, 6a to 6c ... Transport roller, 7a to
7c: Pressure roller, 8a to 8c: Hopper.

Claims (1)

(57) [Claims] A plurality of hoppers for accommodating a medium; a roller for extracting a lowermost medium; a weight for pressing the medium against the roller; and a hopper for extracting the medium. In a medium issuing apparatus comprising a separation gate for separating the medium into one sheet, the separation gate has a slope formed at a predetermined angle on the front side with respect to the medium conveyance direction, and a slope substantially parallel to the conveyance direction. The upper part of the slope has a low coefficient of friction surface, the other part below and the parallel surface part are both constituted by a high coefficient of friction surface, and the parallel surface has an angle for receiving the medium. A separation mechanism for a medium issuing device, characterized in that a member having a surface facing the separation gate is provided, and a slope is provided in front of the separation gate so that a lowermost medium enters a high friction coefficient surface of a slope of the separation gate.