JPH0275553A - Device for compensating diagonal advance of paper sheet - Google Patents

Abstract

PURPOSE:To compensate a diagonal advance of a paper sheet by computing the quantity of the diagonal advance of the paper sheet based on a signal from passage senses to detect the passage of the paper sheet, and changing a distance between the axes of transfer rollers for one side or both sides corresponding to the quantity of the diagonal advance. CONSTITUTION:A diagonal advance of a paper sheet 4 passing a transfer way 3 is detected as a difference between passage times at passage sensors 17, 18. A computation and controlling circuit 21 computes the quantity of the diagonal advance based on this time difference, and the result is collated to compensation data in a compensation data memorizing part 22 to obtain a proper compensation quantity. A stepping motor 13 is driven through a motor drive circuit 23 corresponding to the obtained compensation quantity to rotate an eccentric cam 14 to change the distance between the axes of a drive roller 5 and a follower transfer roller 6. By changing the distance between the axes, pressure of the transfer rollers at the right and left, therefore a transfer quantity, can be changed, thereby the diagonal line of the paper sheet 4 can be compensated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper sheet skew correction device for automatically correcting the bank of paper sheets such as banknotes.

[Conventional technology]

In the skew correction device for paper sheets, for example,
As described in Japanese Patent No. 48344, when skew is detected, one side is stopped to correct the skew. but,
No consideration was given to accurately correcting these according to the amount of skew.

[Problem to be solved by the invention]

In the conventional example described above, since one side is stopped when skew is detected, it is insufficient to perform accurate correction according to the amount of skew, and reading errors due to skew at the next stage may occur.
Or, it was not sufficient to deal with jams of paper sheets.

SUMMARY OF THE INVENTION An object of the present invention is to provide a skew correction device for paper sheets that performs accurate correction according to the amount of skew.

[Means to solve the problem]

The above objective is achieved by calculating the amount of skew based on the signal from a sensor that detects the passage of paper sheets, and by providing a means for automatically changing the distance between the axes of one or both of the conveying rollers according to the amount of skew. be done.

[Effect]

An arithmetic circuit quantitatively calculates the amount of skew of the paper sheet based on the passing time of two or more sensors that detect the passage of the paper sheet, the distance at which the sensor is placed, and the transport speed of the paper sheet, and calculates the calculation result. is compared with the skew correction data, the correction amount is transmitted to a means for automatically changing the distance between the axes of the conveyance roller, an appropriate distance between the axes is set for correction, and the left and right suppression of the conveyance roller is changed. The skew is corrected by changing the amount of left and right conveyance of the conveyance rollers.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a schematic diagram of a paper sheet skew correction device according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG. 1. FIG. 3 is a view taken along arrow B in FIG.

A drive conveyance roller 5 for conveying paper sheets 4 such as banknotes is provided in a conveyance path 3 composed of a guide 1 and a guide 2.
A driven conveyance roller 6 is arranged opposite to the driving conveyance roller 5. The drive conveyance roller 5 is driven by a drive source such as a motor (not shown) via a belt or the like. The driven conveyance roller 6 has bearings 9 and 1 at both ends thereof connected to indicators 7 and 8, respectively.
Supported through 0. The supports 7 and 8 are supported by a common support shaft 11, and a spring 12 applies pressure to the driving conveyance roller 5. The support body 7 is locked by an eccentric cam 14 connected to a stepping motor 13 so as to apply appropriate pressure. Further, a sensor plate 15 for detecting a localization value is fixed to the rotating shaft of the stepping motor 13, and a U-shaped position detection sensor 16 for detecting a slit in the sensor plate 15 is located on the side of the sensor plate 15. It is located in On the conveyance path 3, passage sensors 17 and 18 for detecting the passage of paper sheets 4 are arranged in parallel with the driving conveyance roller 5 and the driven conveyance roller 6. It is connected to the. The arithmetic control circuit 21 is connected to a skew supplementary data storage section 22 that stores skew correction data, and is connected to a motor drive circuit 2.
3. Connected to stepping data via signal line 24.

Next, the operation of the sheet skew correction device having the above configuration will be explained.

The eccentric cam 14 has a sensor plate 15 and a fixed position detection sensor 16.
It is held in a fixed position by a stepping motor 13. Paper sheets 4 are conveyed from the previous stage and driven by the driving conveyance roller 5
Passing sensors 17 and 18 pass between the and driven conveyance rollers 6.
The zero passing sensors 17 and 18 transmit the passing time of the paper sheet 4 to the arithmetic control circuit 21 via the signal line 19 and the sensor drive circuit 20. If there is skew at this time, a difference will occur between the passing times of the passing sensors 17 and 18. The arithmetic control circuit 21 quantitatively calculates the amount of skew from this time difference, the distance between the passing sensors 17 and 18, and the transport speed of the sheet 4. This result is compared with the correction data in the skew correction data storage section 22 to calculate how much the distance between the axes of the driving conveyance roller 5 and the driven conveyance roller 6 should be increased or decreased. The stepping motor 13 is driven and the eccentric cam 14 rotates the support body 7 about the support shaft 11 to change the distance between the shafts. For example, as shown in Figure 2, paper sheets 4
If the right side is moving forward in the direction of travel, the stepping motor 13 is rotated in the direction to reduce the distance between the axes by the number of steps corresponding to the amount of skew, and the suppression on the left side is increased to increase the amount of conveyance on the left side. Correct skew. If the paper sheet 4 is being conveyed with the left side advancing in the direction of travel, the stepping motor 13 is rotated in a direction that increases the distance between the axes, lowering the pressure on the left side, and reducing the amount of conveyance on the left side. Correct the line. After the correction is completed, the stepping motor B returns to the normal position and waits for the next sheet to pass.In this way, accurate skew correction can be performed.

Component Application 1 As an alternative, the driving conveyor roller 5 and the driven conveyor roller 6 may be conveyors such as belts.

Further, instead of driving the driving conveyance roller 5 and the driven conveyance roller 6, one or both may be fixed and act as a brake. In this case, the increase/decrease in the distance between the axes is opposite to that in the previous embodiment.

【Effect of the invention〕

With the configuration as described above, the following effects can be obtained in the present invention.

1. Since the correction amount is set according to the amount of skew, skew can be corrected accurately.

2. Since it is accurate and can be corrected, it is possible to prevent reading errors and paper jams in the next stage, improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a skew correction device for paper sheets showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a view taken in the direction of arrow B in FIG. 1. It is. 5... Drive conveyance roller, 6... Driven conveyance roller, 13... Stepping motor, 14... Eccentric cam, 17.18... Passage sensor, 20... Sensor drive circuit, 21...・Arithmetic control circuit, 23...
・Motor drive circuit.

Claims (1)

[Claims] 1. In a paper sheet transport path that has a transport roller for transporting paper sheets and two or more sensors that detect the passage of the transported paper sheets, the amount of skew is determined by the signal from the sensor. What is claimed is: 1. A skew correction device for paper sheets, comprising: an arithmetic circuit for calculating the amount of skew; and means for changing the distance between the axes of one or both of the conveying rollers in accordance with the amount of skew.