JPH0452647Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a paper sheet counting device, and in particular, it feeds paper sheets into a paper receiving section without remaining in the conveyance path by the action of a one-way clutch and a flywheel provided on a tension roller. The present invention relates to a paper sheet counting device for accurately measuring the length of paper sheets regardless of fluctuations in feeding speed.

In conventionally used devices of this kind, the length of a paper sheet is measured by measuring the time it takes for the paper sheet to pass through a detection section.

However, in the conventional configuration as described above, a change in the sheet conveyance time due to a change in the circumferential speed of the delivery roller is detected as a change in the length of the sheet, and the actual length of the sheet and the detected This would result in errors between the measured numerical data and the accurate measurement of the length of the paper sheet.

That is, the rotation of the drive motor for rotationally driving the feed roller is as shown in FIG.
Since it takes time for the rotation speed of the drive motor to rise to the specified value after the power switch is turned on, and until it stops when the power switch is turned off, paper sheets passing through the detection unit during this period A and B are The length was measured as being longer than the actual value.
Therefore, in conventional sheet counting devices, a clutch and an electromagnetic brake are disposed between the drive motor and the feed roller, and the clutch is kept off until the motor rotation reaches a specified value at startup. When the rotation of the drive motor reaches a specified value, the clutch is held in the on state and the rotation of the drive motor is transmitted to the feed roller. Furthermore, when stopping the feed roller, the clutch is turned off and the electromagnetic brake is used to suddenly stop the feed roller, so the time that is actually used from the time the drive motor starts until it stops is used. is C
It was extremely wasteful as it was limited to the range indicated by .
In addition, in such a conventional paper sheet counting device, when the feed roller is stopped, the feed roller and the tension roller, which are connected by the transmission body, are simultaneously stopped, and the paper fed by the feed roller is There have been problems in that leaves may remain in the conveyance path between the tension rollers or on the tension rollers, leading to errors in counting or hindering the start of new counting. Furthermore, in this type of paper sheet counting device, the objects to be counted are paper sheets such as banknotes, and because they are transported at high speed, a large amount of paper dust becomes statically charged and becomes suspended in the air during operation. However, due to the infiltration and adhesion to the pressure contact surface of the clutch, the pressure contact surface slips, resulting in incomplete clutch operation. Therefore, a dust-proof structure for the clutch is required, and a structure such as a partition wall between the clutch and the conveyance path, where the most floating paper dust is present, is required, resulting in an increase in the outer diameter of the device. In addition, if the rotation speed drops below the specified value for some reason after the drive motor starts rotating at a constant speed,
The length of the paper leaf was detected as being longer than the actual value.

The present invention was developed to eliminate these drawbacks, and is a method for counting paper sheets with a small outer diameter that does not require a normal clutch and does not leave any paper sheets in the conveyance path when stopped. It is an object of the present invention to provide a paper sheet counting device capable of accurately measuring the length of paper sheets without being affected by speed fluctuations in a driving means or slips between the paper sheets and a roller.

In order to achieve such an objective, the present invention has a cylindrical delivery roller that is provided rotatably, a pinch roller that rotates in conjunction with this delivery roller, and a rotation drive means for the delivery roller. a first tensioning roller driven through the body; a flywheel connected to the shaft of the first tensioning roller; and a feed roller or a flywheel connected to the shaft of the first tensioning roller in the direction of rotation for conveying the paper sheets. a one-way clutch that is free in the opposite direction and locked in the opposite direction; a second tension roller that rotates in conjunction with the first tension roller;
and a paper sheet detection unit disposed in the paper sheet conveyance path in proximity to the second tension roller, and a pulse generator coupled to the shaft of the second tension roller, and the paper sheet detection unit is provided with a paper sheet detection unit disposed in the paper sheet conveyance path in proximity to the second tension roller, and a pulse generator connected to the shaft of the second tension roller. The length of the paper sheet is measured by the number of pulses output from the pulse generator while the paper sheet is fed out while being held between the first and second tension rollers and passes through the paper sheet detection section. It was designed to do so.

Even if the feed roller stops, the first tension roller shaft and its roller rotate due to the inertia of the flywheel, and the second tension roller to be joined is also driven, so that it is held between the first and second tension rollers. The paper leaf that has been sent out will definitely be sent out. Also, there is no need to provide a normal clutch,
Furthermore, since the brake can be omitted, the entire device can be made extremely compact and compact. The second tension roller normally rotates in conjunction with the first tension roller, but when holding paper sheets between the first tension roller and the first tension roller, the second tension roller is connected to the first tension roller through the paper sheets. Since it will be driven,
There is no slip between the second tension roller and the paper sheet, and the pulse generator provided on the shaft of the second tension roller generates pulses according to the rotation of the shaft, that is, the number of rotations or the rotation angle of the roller. Therefore, when measuring the length of a paper sheet using this number of pulses, it is necessary to accurately measure the length of the paper sheet without considering speed fluctuations in the drive means, such as a decrease in the rotational speed of the drive motor. can do.

Hereinafter, preferred embodiments of the paper sheet counting device according to the present invention will be described in detail with reference to the drawings.

In FIG. 2, the reference numeral 1 indicates a feed-out roller shaft having a feed-out roller 2 having a generally cylindrical shape as a whole. A second pulley 7 provided at an end of an output shaft 6 of a drive motor 5 is attached to an end of the first belt 4. Braking means consisting of an electromagnetic brake 8 is integrally attached to the center of the output shaft 6, and as the drive motor 5 rotates, the feed roller 2 and the feed roller shaft 1 are simultaneously rotated. , the respective pulleys 3 and 7, the first belt 4, and the feed-out roller shaft 1 constitute a rotation driving means 9 for the feed-out roller 2. It should be noted that the brake means 8 can be provided on any of the rotary drive means to obtain the same effect.

Further, a pinch roller 10 is connected to the feed roller 2, and a third pulley 12 connected to a second belt 11 as a transmission body is integrally provided at the other end of the feed roller shaft 1. , a fourth pulley 1 is attached to the other end of this second belt 11.
3 is provided. This fourth pulley 13 is provided with a first tension roller shaft 16 that integrally has a first tension roller 15 via a one-way clutch 14. A flywheel 17 is integrally attached thereto. Further, this one-way clutch 14 is not limited to the fourth pulley 13, but also the third
It may also be provided on the pulley 12. Note that the circumferential speed of the first tension roller 15 is preferably set to be the same as or slightly faster than the circumferential speed of the delivery roller 2.

Furthermore, a second tension roller 19 provided at one end of a second tension roller shaft 18 is connected to the first tension roller 15, and a known pulse generator such as a rotary pulse generator is connected to the other end of the second tension roller shaft 18. An encoder 20 is provided. The one-way clutch 14 is in a free state in the direction in which paper sheets are sent out, that is, in the counterclockwise direction (indicated by arrow a), and in the clockwise direction (indicated by arrow b).
Even if the brake means 8 is actuated and the feed roller 2 stops rotating, the flywheel 17 keeps the first and second tension rollers 15 and 19 in the direction of the arrow due to its inertia. Each can be rotated in the directions shown.

FIG. 3 schematically shows the overall configuration of the configuration shown in FIG.
The paper sheets 22 stacked on the paper feed section 21 are provided at the upper part of the paper feed section 21, and a separation roller 23 is joined to the guide plate 24, which has an approximately semi-cylindrical shape as a whole. It is set in. A sheet detecting section 28 consisting of a light source 26 and a light receiving element 27 is provided at the exit section 25 of the guide plate 24, and the pair of tension rollers 15 is provided in close proximity thereto.
and 19 are provided. The distance between the nipping point N ₂ of the tension rollers 15 and 19 and the nipping point N ₁ of the feed roller 2 and the pinch roller 10 is set to be equal to or slightly shorter than the length of the sheet. A paper receiver 30 having a receiver wheel 29 is disposed at an end of the guide plate 24.

In the above configuration, the case where the paper sheet counting device according to the present invention is operated is as follows.
First, by turning on a power switch (not shown), the drive motor 5 rotates, and the second pulley 7,
The feed roller 2 on the feed roller shaft 1 starts rotating in the direction of the arrow via the first belt 4 and the first pulley 3. Due to this rotation of the feed roller 2, the paper sheets 22 on the paper feed section 21 are separated by the separation roller 2 due to the frictional force between the peripheral surface of the feed roller 2 and the paper sheets.
The sheets are separated one by one and conveyed along the guide plate 24 to the sheet detecting section 28 while being pinched by the pinch rollers 10 . When the paper sheet detection section 28 detects the leading edge of the paper sheet 22, it emits a detection signal, and this signal is counted in the counter section in the control circuit, and at the same time, when it reaches the AND gate from the passage detection circuit, it is sent to the rotary encoder 20. After passing through the waveform shaping circuit, the signal is input to the length measuring circuit (comparator). Next, when the sheet detecting section 28 detects the trailing edge of the sheet, the passage detection circuit stops the signal to the AND gate, and the input of the signal from the rotary encoder 20 to the length measuring circuit is stopped. In the length measuring circuit, the length of the sheet 22 is compared with a preset value, and if there is an abnormality in the length of the sheet 22, an abnormality signal is sent to the control circuit. Based on this abnormality signal, the control circuit instructs the drive circuit to stop the drive motor 5 and operate the electromagnetic brake 8 (see FIG. 6). Note that the paper sheet detection unit 28 can be configured so that the abnormal signal is generated depending on the brightness and darkness of the paper sheet, deviation in position, and the like.

The paper sheet 22 that has passed through the paper sheet detection section 28 is held between the respective tension rollers 15 and 19 and sent to the paper receiving section 3.
It is accumulated to 0.

Next, in the case of batch counting, when the sheet detecting section 28 detects the leading edge of the last sheet of the set number of sheets and generates a detection signal, and when the comparator determines whether there is an abnormal sheet or conveyance abnormality. When an abnormal signal is generated, the control circuit stops the drive motor 5 and the electromagnetic brake 8 suddenly stops the output shaft 6, and at the same time the rotation of the feed roller 2 stops and the sheet 22 is fed from the paper feed section 21. It disappears. At the same time, the rotation of the fourth pulley 13 suddenly stops, but due to the one-way clutch 14 provided between the fourth pulley 13 and the tension roller shaft 16, the tension roller 15 is rotated by the inertia of the flywheel 17. Since the one-way clutch 14 rotates in the direction a (that is, the direction in which the one-way clutch 14 is free), the second tension roller 19 also rotates at the same time. The paper sheet 22 is fed into the paper receiving section 30.

Furthermore, the configuration shown in FIG. 4 shows another embodiment of the paper sheet counting device according to the present invention, in which an electromagnetic brake 8 as a braking means is attached to the feed-out roller shaft 1 of the feed-out roller 2, Since the other configurations and operations are the same as those of the above-described embodiment and can achieve exactly the same effects, the same reference numerals will be used and the explanation will be omitted.

The paper sheet counting device according to the present invention has the above-described structure and operation, and when the feed roller is suddenly stopped, subsequent paper sheets are prevented from entering the conveyance path, and the paper sheet counting device according to the present invention is prevented from entering the conveyance path. The final sheet of paper located at the outlet of the path is held between the first and second tension rollers by the action of the flywheel that rotates due to inertia through the use of a one-way clutch, and is fed into the paper receiving section. Leaves remaining in the conveyance path can be completely removed. The length of the paper sheet is determined by the number of pulses generated by the rotation of the roller shaft from a pulse generator provided at one end of the second tension roller shaft. Since the counting is performed until the sheet passes through the sheet detecting section disposed on the sheet conveyance path close to the second tension roller, the sheet is counted regardless of the sheet feeding speed.
It is possible to measure the length of a paper sheet with extremely high precision, and as shown in FIG. It is possible to precisely count the length of paper sheets.

[Brief explanation of the drawing]

Fig. 1 is a characteristic diagram showing the counting state with respect to the rotation time of the drive motor in a conventionally used device, Fig. 2 is a perspective view showing the main parts of the paper sheet counting device according to the present invention, and Fig. 3 is FIG. 4 is a side view showing the overall configuration of the sheet counting device according to the present invention, FIG. 4 is a side view showing another embodiment, and FIG. 5 is a diagram showing the rotation time of the drive motor in the sheet counting device according to the present invention A characteristic diagram showing the counting state, FIG. 6 is a block diagram of the paper sheet counting device of the present invention. 1 is the delivery roller shaft, 2 is the delivery roller,
3 is a first pulley, 4 is a first belt, 5 is a drive motor, 6 is an output shaft, 7 is a second pulley, 8 is an electromagnetic brake (braking means), 9 is a rotary drive means, 10
is the pinch roller, 11 is the second belt, and 12 is the third belt.
Pulley, 13 is a fourth pulley, 14 is a one-way clutch, 15 is a first tension roller, 16 is a first tension roller shaft, 17 is a flywheel, 18 is a second tension roller shaft, 19 is a second tension roller, 2
0 is a pulse generator, 21 is a paper feed section, 22 is a paper sheet,
23 is a separation roller, 24 is a guide plate, 25 is an exit section, 26 is a light source, 27 is a light receiving element, 28 is a paper sheet detection section, 29 is a receiving wheel, and 30 is a paper receiving section.

Claims (1)

[Scope of utility model registration request] a cylindrical delivery roller that is rotatably provided; a pinch roller that rotates in conjunction with the delivery roller; a first tension roller that is driven by a rotational drive means for the delivery roller via a transmission body; a flywheel connected to the shaft of the tension roller; and a one-way drive wheel connected to the shaft of the feed roller or the first tension roller, which is free in the direction of rotation in which paper sheets are conveyed and locked in the opposite direction. Clutch and the first
a second tensioning roller that rotates in conjunction with the tensioning roller; a paper sheet detection unit disposed in a paper sheet conveyance path in proximity to the first and second tensioning rollers; and an axis of the second tensioning roller. a pulse generator coupled to a pulse generator, and the sheet fed out by the feed roller is held between the first and second tension rollers and sent out, while passing through the sheet detecting section. A paper sheet counting device characterized in that the length of the paper sheet is measured by the number of pulses output from a pulse generator.