JPH04292340A - Sheet delivery and separating mechanism - Google Patents

Abstract

PURPOSE:To provide a sheet delivery and separating mechanism which has high reliability on delivery and separation of sheets. CONSTITUTION:A sheet 1 delivery separating mechanism is provided with a separation repeating means comprising a pickup roller 11, a means to press sheets 1 against the pickup roller 11, a feed roller 12, and a gate roller 13. After the sheets 1 are brought into a state to be nipped between a hood roller 12 and a gate roller 13 by the pickup roller 11, a press force generated between the press means and the pickup roller 11 is reduced.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is applicable to banknote and statement slip dispensing devices built into automated teller machines used in financial institutions, etc., which require particularly high reliability in dispensing and separating paper sheets. The present invention relates to a paper sheet feeding and separating mechanism suitable for use in cases where paper sheets are fed and separated.

0002

[Prior Art] Conventional devices of this type include, for example,
A device as shown in FIG. 5 is known. Of these, Figure 5 (
The device shown in a) consists of a pickup roller 11, a feed roller 12, a gate roller 13, and a pressing means 14, and the stacked paper sheets 10 are pressed against the pressing means 14.
, press it against the pickup roller 11, feed out the upper paper sheet 1 with the pickup roller 11, and feed the paper sheet 1 on the top side with the pickup roller 11, and
2 and gate roller 13 to separate the paper sheets one by one.
It is configured so that it is sent out to a subsequent conveyance path. Furthermore, the device shown in FIG. 5(b) does not have a pickup roller, but instead is configured such that a feed roller 12 comes into contact with the stacked sheets and feeds out the top sheet 1. It is something that exists. Feed roller 1 mentioned above
2 and the gate roller 13 are usually provided with a predetermined clamping force by a spring 15 as shown in FIG. It is configured to separate the paper sheets 1 one by one and send them to the subsequent conveyance path. In this regard, for example, the description on pages 295 to 297 of "Information Sheet '87 Edition" (published by Shigyo Times Co., Ltd., March 15, 1986) may be helpful.

0003

[Problems to be Solved by the Invention] The above-mentioned prior art has the following problems. That is,
As shown in FIG. 3, if the friction coefficients of stacked paper sheets are μs1, μs2, ... in order, μs1>μs2
In this case, when the pick-up roller 11 applies a feeding force to the sheet 1, the two sheets 1 and 2 are held between the feed roller 12 and the gate roller 13. Here, if the clamping force between the feed roller 12 and the gate roller 13 is Fg, the friction coefficient between the feed roller 12 and the paper sheet 1 is μf, and the friction coefficient between the gate roller 13 and the paper sheet 2 is μg, μf>μg> If the relationship μs1 is established, the feed roller 12 and the gate roller 1 should be
However, due to the pressing force Fp between the pressing means 14 and the pickup roller 11 mentioned above, , the following extra force is applied to the paper sheet 2 because the relationship μs1>μs2 is established, and the resistance force applied to the paper sheet 2 (force to prevent it from being attached to the paper sheet 1) )R is R=(μg−μs1)Fg−(μs1−
μs2) Fp, and R<0, that is, a conveying force acts on the paper sheet 2 and the paper sheet 2 is fed out together with the paper sheet 1 (double feeding abnormality). In order to prevent this, it is conceivable to reduce the pressing force Fp between the above-mentioned pressing means 14 and the pickup roller 11. This method is not necessarily a good method because other problems occur, such as the sheet 1 slipping or the conveying direction becoming tilted before it is fed into the nipping section. On the contrary, the feed roller 12 and the gate roller 13
It is also possible to increase the clamping force Fg due to F
When g is increased, a large frictional force is applied to the feed roller 12 and the gate roller 13, causing a problem in that they are likely to wear out. The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in the conventional technology and satisfy the above-mentioned relationship of friction coefficients, that is, μf>μg>μs1. It prevents double feeding of paper sheets such as
It is an object of the present invention to provide a paper sheet feeding and separating mechanism that is capable of suppressing wear of a feed roller and a gate roller and has particularly high reliability in feeding and separating paper sheets.

0004

[Means for Solving the Problems] The above-mentioned object of the present invention is to provide a pickup roller that can abut on the upper surface of stacked paper sheets and feed out the abutted paper sheets; and a separating and feeding device consisting of a feed roller and a gate roller arranged opposite to each other to separate the paper sheets fed out by the pickup roller one by one and feed them to a subsequent conveyance path. In the paper sheet feeding and separating mechanism, the paper sheet feeding and separating mechanism has a means for detecting that the paper sheet being fed out by the pickup roller is sandwiched between the feed roller and the gate roller, and when there is an output from the detection means. This is achieved by a sheet feeding and separating mechanism characterized in that the pressing force between the pressing means and the pickup roller is controlled to be reduced or eliminated.

[0005]

[Operation] In the paper sheet feeding and separating mechanism according to the present invention, as shown in FIG. By reducing or eliminating the pressing force between (μg-μs1)Fg>(μs1-μs
2) Fp, the above-mentioned resistance force R applied to the paper sheet 2 will not become R<0, and the above-mentioned double feeding abnormality will not occur. Further, by reducing the pressing force between the pressing means and the pickup roller, wear of the pickup roller can be suppressed. Furthermore, when Fp is made sufficiently smaller than Fg, the resistance force R becomes R>0 regardless of Fg. Therefore, even if Fg is lowered, paper sheets 1 and 2 can be separated, while paper sheets 1 and 2 can be separated.
This is possible by sending out only the feed roller and the gate roller, and the frictional force caused by the feed roller and gate roller is reduced, making it possible to suppress the wear of these rollers.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the main parts of a paper sheet feeding and separating mechanism according to an embodiment of the present invention. In the figure, symbols 11 to 14 indicate the same components as previously described. The feed roller 12 and the gate roller 13 are disposed to face each other, and their surfaces are lined with rubber to increase frictional resistance. Further, a part of the surface of the pickup roller 11 is also lined with rubber to increase frictional resistance. The pickup roller 11 and the feed roller 12 are the belt 1
It is configured to be driven by a motor 16 via a motor 5. Furthermore, a one-way clutch is inserted in the gate roller 13 so that it cannot rotate in the conveying direction.
It is configured to be able to come into contact with and separate from the feed roller 12 (see arrow A), and is normally pressed against the feed roller 12 by a spring 25 via a lever 21, which will be described later. The above-mentioned pressing means 14 is configured to press the stacked paper sheets 10 against the pickup roller 11 using a spring 17. Eccentric cams 23 and 24 are attached to the shaft ends of the pickup roller 11 and the feed roller 12, respectively, and a lever 21 having a roller 22 at one end is connected to springs 25 and 26 via pins 21a and 21b.
, so that they are pressed by the eccentric cams 23 and 24, respectively.

The operation of the sheet feeding and separating mechanism of this embodiment constructed as described above will be explained in detail below. Normally, among the stacked sheets 10, only the first sheet 1 is fed by the rubber part of the pickup roller 11 to the sandwiching part between the feed roller 12 and the gate roller 13, and the rotating feed Since the friction coefficient μf between the roller 12 and the paper sheet 1 is larger than the friction coefficient μg between the fixed gate roller 13 and the paper sheet 1, the paper sheet 1 is conveyed and It advances to the nipping point between the pair of transport rollers 31 and 32 of the stage. Here, as described above, when μs1>μs2, two sheets, ie, paper sheets 1 and 2, are fed between the feed roller 12 and the gate roller 13. However, in this case as well, while the two sheets 1 and 2 are fed between the feed roller 12 and the gate roller 13,
The aforementioned eccentric cams 23 and 24 rotate, and as shown in FIG.
The roller 22 provided at one end of the lever 21 moves the pressing means 14 backward through the stacked paper sheets 10 and reduces the pressing force between the pressing means 14 and the pickup roller 11. The conveying force to the paper sheet 2 based on the pressing force between the paper sheet 11 and the paper sheet 2 no longer acts on it. As a result, the feed roller 12 and the gate roller 1
3, the paper sheet 1 is held with a weaker clamping force than when it is fed out.
By separating the paper sheets 1 and 2, it becomes possible to send only the paper sheet 1 to the nipping point between the next pair of transport rollers 31 and 32. For example, the spring 17 that presses the pressing means 14 against the pickup roller 11 is set on the gate roller 13 so that the pressing force when the pickup roller 11 unwinds is 500 g.
The springs 25 that press the feed roller 12 are set so that the clamping force is 500 g or more during feeding, and the rubber parts of the pickup roller 11 and the feed roller 12 are set to have friction coefficients μp and μf with the paper sheets, respectively. is μp=
μf=1.4, and the rubber portion of the gate roller 13 is selected so that the coefficient of friction μg with paper sheets is about μg=1.0. By selecting in this manner, paper sheets with a friction coefficient μs between the sheets of μs<0.9 will not cause double feeding abnormality.

Furthermore, two sensors 34 are installed in the axial direction just before the nipping point of the next-stage conveyance rollers 31 and 32 so as to be able to detect the inclination of the sheet. When the sensor detects the leading edge of the paper sheet, the motor 3 is configured to start rotating the above-mentioned transport rollers 31 and 32.
5 is controlled. As a result, when the sheet conveyed to the nipping point between the conveyance rollers 31 and 32 is tilted, the leading edge of the sheet on the leading side stops at the entrance of the nipping roller, and the sheet on the lagging side Only the leading edge of the sheet advances, the inclination of the sheet is corrected, and the sheet is nipped by the next conveyance roller. More specifically, in the above-mentioned case, in order to correct the inclination of the paper sheet, it is necessary for "slip" to occur at the nip part between the feed roller 12 and the gate roller 13, but in this embodiment, "slip" must occur. As described above, the eccentric cams 23 and 24 rotate, and as shown in FIG. decreases, so
The above-mentioned "slip" is more likely to occur, making it easier to correct the inclination. In addition, the feed roller 12 and the gate roller 13
The reduction in the clamping force at the clamping portion also has the effect of reducing wear on the rubber.

FIG. 4 shows another embodiment of the present invention. The difference from the previous embodiment is that the stacked paper sheets 10 are moved up and down by a step motor 48 and are pressed against a pickup roller 11. The pickup roller 11 is rotatably supported by a bracket 15 around the feed roller 12, and is supported by a spring 45.
The pickup roller 1 is applied to the paper sheets 10 stacked by
It is configured to apply a pressing force of 1. In addition,
Reference numerals 41 and 42 indicate optical sensors (hereinafter simply referred to as "sensors") for detecting the rotational position of the bracket 45. In the paper sheet feeding and separating mechanism shown in this embodiment, when the top sheet 1 of the stacked paper sheets 10 is fed out by the pickup roller 11, the pressing means 14 is lifted by the step motor 48, and the stacked paper sheet 1 is lifted. When the paper sheet 10 pushed up the pickup roller 11 and the sensor 42 detects the tip of the bracket 45, the step motor 48 is stopped. As a result, a predetermined pressing force is applied to the paper sheet 1, and the pickup roller 11
It becomes possible to feed out the paper sheet 1 by using the . When the paper sheet 1 is fed out by the pickup roller 11 and the leading edge of the paper sheet 1 is detected by the sensor 43, the step motor 48 is driven in reverse to lower the pressing means 14, and the sensor 41
stops when it detects the tip of the bracket. As a result, the stacked paper sheets 10 receive almost no pressing force from the pickup roller 11 (pressing means 14). Therefore, after the fed paper sheet 1 is sandwiched between the feed roller 12 and the gate roller 13, the pressing force exerted by the pickup roller 11 becomes zero or very small.
For the same reason as stated in the section of the above-mentioned embodiment, the effect of eliminating double feeding abnormalities can be obtained. According to the above embodiment, the relationship of the friction coefficients described above, that is, μf>μg>
It is possible to prevent double feeding of paper sheets that satisfy μs1, and it is also possible to suppress wear of the pickup roller, feed roller, and gate roller. It should be noted that the above-mentioned embodiments are merely examples of the present invention, and it goes without saying that the present invention should not be limited to these.

0010

Effects of the Invention As explained above in detail, according to the present invention, the above-mentioned relationship of friction coefficients, that is, μf>μ
For paper sheets that satisfy g>μs1, it is possible to prevent double feeding, and it is possible to keep the wear of the pickup roller, feed roller, and gate roller low, and it is possible to feed and separate paper sheets. This has the remarkable effect of providing a paper sheet feeding and separating mechanism that has particularly high reliability.

[0011]

[Brief explanation of drawings]

FIG. 1 is a sectional view showing essential parts of a paper sheet feeding and separating mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the embodiment shown in FIG. 1.

FIG. 3 is a diagram for explaining problems in the prior art.

FIG. 4 is a sectional view showing a main part of a paper sheet feeding and separating mechanism according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing the main parts of a conventional sheet feeding and separating mechanism.

FIG. 6 is a side view showing the main parts of a conventional sheet feeding and separating mechanism.

[Explanation of symbols]

1, 2, ... Paper leaves 10 Stacked paper sheets 11 Pick up roller 12 Feed roller 13 Gate roller 14 Pressing means 17, 25, 26, 33, 45 Spring 21 lever 22 Roller 23, 24 Eccentric cam 41-43 Sensor

Claims (2)

[Claims] 1. A pick-up roller that comes into contact with the upper surface of the stacked paper sheets and is capable of feeding out the paper sheets that have come into contact with the top surface of the stacked paper sheets;
a pressing means for pressing the paper sheets against the pickup roller; and a feed roller disposed facing each other for separating the paper sheets fed out by the pickup roller one by one and feeding them to a subsequent conveyance path. A paper sheet feeding and separating mechanism having a separating and feeding means consisting of a gate roller and a gate roller, further comprising a means for detecting that the paper sheet being fed out by the pickup roller is sandwiched between the feed roller and the gate roller; A paper sheet feeding and separating mechanism, characterized in that when there is an output from the detection means, control is performed so that the pressing force between the pressing means and the pickup roller is reduced or eliminated. 2. In addition to the control, when there is an output from the detection means, control is performed such that the pressing force between the feed roller and the gate roller is reduced or eliminated. The paper sheet feed and separation mechanism described.