JPS592033Y2 - Duplicate feed detection device in paper sheet processing machines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double feed detection device in a paper sheet processing machine.

Like a dispensing machine for banknotes and other paper sheets, it takes out paper sheets one by one from a paper sheet storage section stored in a predetermined location, transports them, counts the predetermined number of sheets, and then throws them out. In this case, it is necessary to detect when two sheets are taken out from the storage section and transported, and to reject the sheets that are being fed with priority or to stop the machine.

However, although various overlapping feed detection devices for paper sheet processing machines as described above have been proposed and put into practical use,
In general, in conventional rollers, one of the rollers that pinches the passing paper sheet is provided with a spring bias against the other roller so that it can be freely moved toward and away from the other roller.
The microswitch is configured to detect when one roller is excessively separated from the other roller when sheets are fed in a state in which more than one sheet is overlapped.

However, the above-mentioned conventional apparatus has a particular problem in the case of thin paper sheets (for example, paper sheets) because the difference between the thickness of two sheets and the thickness of one sheet is very small.

For example, if the thickness of one paper sheet is in the range of 0.07 to 0.12 m/m, the thickness of two sheets is in the range of 0.14 to 0°2.
4m/m, and the minimum thickness of the two sheets (0.14m/m
) and the maximum thickness of one sheet (0.12m/m) 0.0
A change of 2m/m must be detected.

When detecting such minute differences using a microswitch, the vibrations transmitted to the contacts have a large effect.

In other words, during normal overlap feed detection, the switch contact is turned ON when the leading edge of the paper sheet type section enters between the rollers, and the switch contact is kept in the ON state until the overlap section passes between the rollers. During this period, a constant ON signal waveform is output.

However, as the overlapping paper sheets pass between the rollers, mechanical vibrations or the like transmitted to the switch contacts cause the contacts to be turned off instantaneously, causing waveform breaks in the output waveform of the microswitch.

Therefore, in the post-processing circuit that receives the detection signal from the double-feed detection device, performs post-processing, and outputs a reject signal or machine stop signal, for example, the post-processing circuit receives the detection signal of the double-feed detection device and outputs a reject signal or machine stop signal. If a reject signal or machine stop signal is output when a signal with a broken waveform is received, it will be determined that the paper is being fed normally, and as a result, it will not be possible to determine whether two sheets are being fed in an overlapped manner. Become.

For this reason, a very short waveform is set so that even if a waveform break occurs, it can be determined that two sheets overlap, and when a signal of that waveform is received, a cut signal or a machine stop signal is output. There is.

However, the timing at which waveform breaks occur is irregular, and if waveform breaks occur repeatedly at intervals shorter than the set waveform, it is still impossible to determine whether two sheets overlap.

In addition, not only when overlapping paper sheets enter and exit between the rollers, but also when a single sheet enters and exits, one roller moves excessively relative to the other roller due to inertia. In the post-processing circuit, this chattering affects the post-processing, so it is necessary to have a circuit configuration that can eliminate the chattering.

Furthermore, when detecting the above-mentioned slight difference using a microswitch, the hysteresis of the microswitch contact (from OFF to OFF)
The switching position to N is different from the switching position from ON to OFF, and it is difficult to determine the thickness of the paper sheet to be detected and set.

For example, its dimensions are 0.14 m/m (thickness range for 2 sheets 0.
14 to 0.24 m/m), the position where the switch contact changes from OFF to ON is also 0.14 m/m.
If the hysteresis is 0.02m/m, the switch contact O
The switching position from N to OFF is 0.12 m/m.

By the way, if the tip of a sheet of paper with a thickness of 0.12 m/m enters between the rollers, and one of the rollers momentarily drops to zero due to inertia.
．． When the roller moves away from other rollers by 14 m/m or more, the switch contact is turned ON.

One roller immediately returns to the sheet surface and comes into contact with the sheet surface, and the gap between it and the other roller is maintained at 0.12 m/m, but the switch contact changes from ON to OFF. Since the switching position is 0.12 m/m, the contact may remain ON and not switch.

When the ON state of the contact continues for a certain period of time and the waveform of the ON signal overlaps two sheets and reaches a length that can be treated as a paper sheet, the post-processing circuit that receives the waveform signal and performs post-processing processes it. A reject signal or a machine stop signal is output even though the machine is passing the machine.

As mentioned above, in conventional overlapping feed detection devices, a signal waveform with a length corresponding to the overlapping length of overlapping paper sheets is not output from the microswitch, and the post-processing circuit also outputs a reject signal or machine stop signal. It is difficult to perform post-processing for forming, and it is necessary to eliminate chattering in the post-processing method, and there are restrictions on the post-processing method, resulting in a lack of stability, for example when rejecting overlapping paper sheets, etc. This results in having to reject more paper sheets than necessary, which unavoidably degrades the paper processing function.

In view of this, the present invention was devised for the purpose of providing a duplicate feed detection device that can solve the problems of the conventional devices described above. A driven rotary body is arranged oppositely to the conveyance body such that they can be moved toward and away from each other by applying force, and the driven rotary body is attached to the conveyance body in order to form a gate gap between the conveyance body and the driven rotary body that allows passage of one sheet of paper. A stop member is provided to restrict the approach position of the cartwheel body and to restrain the driven rotary body from rotating when the position is restricted, and when a gate gap is formed by the driven rotary body, the rotary body is prevented from rotating by the stop member. When two or more paper sheets are fed redundantly, the driven rotating body is pushed by the paper sheets and is released from the restriction of position and rotation by the stop member. The overlapping feed is detected by detecting the rotation of the detected object which is rotated and rotates in conjunction with the rotation of the driven rotary body using a detector.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

In the illustrated embodiment, the conveyance means for the paper sheets P taken out one by one from a paper sheet storage section (not shown) includes a pair of conveyor belts 1,
2, a driving rotary body 4 as a conveying body is provided on a pulley shaft 3 at one end of one conveyor belt 1, and the circumferential surface of the driven rotary body 5 is opposed to the circumferential surface of this driving rotary body 4. will be placed in

The driven rotary body 5 is rotatably attached to a support member 7 whose one end is swingably supported on the machine frame by a shaft 6, and is rotatably attached to the support member 7 by a shaft 8. Behind the free end of this support member 7, A pressure spring 11 stably supported by a screw 10 is brought into contact with a plate spring 9 having one end fixed, and urges the driven rotary body 5 in the direction of the drive rotary body 4 .

The tip end 10a of the screw 10 functions as a movement limiter so as to limit the deflection of the pressure spring 11 and deflect the leaf spring 9 when the support member 7 swings by a predetermined amount or more.

On the side surface of the driven rotary body 5, there are detected portions 12', 12' arranged in a row at a predetermined interval on the same circumference in order to detect the amount of rotation of the rotary body 5. A detected object 12 is provided, and constitutes a detection device 14 in cooperation with a detector 13, which will be described later.

In the illustrated embodiment, the detected portion 12 of the detected object 12
', 12'... consist of holes drilled in the axial direction, which are suitable for the configuration of the detector 13. The following configuration is adopted.

In this embodiment, the detector 13 is composed of a photosensor supported at the tip of the leaf spring 9, and
The detected portion 12' is located at the periphery of the detected portion 12'.

12'... is designed to emit a signal upon detection of passing, and is connected to a counting circuit in the post-processing circuit.

A stop member 15 is brought into contact with the peripheral surface of the driven rotor 5 on the drive rotor 4 side.

This stop member 15 is a roller-shaped member made of a material with a large coefficient of friction, and its intermediate portion is fixedly supported by one end of an adjusting member 17 that is pivotally supported on the machine frame by a shaft 16. An adjustment screw 18 screwed into the end comes into contact with a reference surface 19 provided on the machine frame, and the position of the stop member 15 can be finely adjusted by this adjustment screw 18.

In this way, the stop member 15 regulates the approaching position of the driven rotary body 5 with respect to the conveyance body, and when restricting the approach position, the stop member 15 prevents the rotation of the driven rotary body 5 and prevents a sheet of paper between the conveyance body and the driven rotary body 5. Gate spacing is designed to allow passage of leaves.

Next, the operation of the above embodiment will be explained.

First, in order to adjust the gap between the driving rotary body 4 and the driven rotary body 5, a sheet of paper P to be processed is placed between them, and the adjusting screw 18 is rotated to swing the adjusting member 17. , the stop member 15 is brought into contact with the circumferential surface of the driven rotating body 5.

Thereby, the gap between the driving rotor 4 and the driven rotor 5 is adjusted within the range of the thickness of one or more sheets and less than two sheets of paper to be processed.

After setting the gate gap in this way, when the paper sheets P taken out one by one from the paper sheet storage section (not shown) are sent between the conveyor belts 1 and 2 in the direction of the arrow in FIG. When there is only one paper sheet P, the driving rotary body 4 is rotated as shown in the second figure.
and the driven rotating body 5.

At this time, since the stop member 15 is in contact with the driven rotary body 5, it does not rotate, and it is considered that only one sheet has passed normally.

When the paper sheets P are fed in two layers as shown in the third figure, the driven rotary body 5 is pushed to the left in the figure due to the excessive thickness of the paper sheets P, and the support member 7 that supports this is pushed to the left in the figure. It is swung counterclockwise about the shaft 6 against the pressure spring 11.

As a result, the driven rotary body 5 is separated from the stop member 15 and becomes in a state where it can rotate freely, and the rotation of the drive rotary body 4 is transmitted to the driven rotary body 5 via the paper sheet P due to friction with the paper sheet P. , it will be rotated in the direction of the arrow in FIG.

When the driven rotating body 5 rotates, the detector 13 of the detection device 14
detects the movement of the hole, which is the detected part 12' of the detected object 12, and the detection signal is counted by a counting circuit in the post-processing circuit, and the counted value is the rotation amount of the driven rotary body 5, that is, the two The count value signal corresponding to the overlapping length of the stacked paper sheets P is used for post-processing for forming a reject signal or a machine stop signal.

In the above action, when the thickness of two sheets of paper P is large, or when three or more sheets are fed at the same time, the amount of separation of the driven rotor 5 becomes large, but in this case, the driven rotation Since the support member 7 that supports the body 5 hits the tip 10a of the travel limit screw 10 screwed into the leaf spring 9, the leaf spring 9 is bent as a whole.
The positional relationship between the detector 13 and the detector 13 is always maintained in an appropriate state.

Note that the detected portion 12' of the detected object 12 provided on the side surface of the driven rotary body 5 may be formed by using a magnetic body in connection with the configuration of the detection device 14, in addition to the through hole, and may also be formed by using a magnetic material in conjunction with the configuration of the detection device 14. A member may be provided and the rotation may be detected by the reflected light.

As explained above, in the present invention, a driven rotating body of a conveying body such as a conveying belt or a conveying roller that is driven to convey paper sheets is arranged so as to be able to come into contact with and be separated from the conveying body by energizing, and A stop member is provided to form a gate gap with the rotating body that allows passage of one paper sheet, and the stop member regulates the approach position of the driven rotating body with respect to the conveying body,
In addition, the driven rotary body is restrained so as not to rotate when the rotation is restricted, so that when a gate gap is formed between the conveying body and the driven rotary body, the rotary body is prevented from rotating by the stop member and is fixed. constitutes a gate member,
When two or more paper sheets are fed in duplicate, the driven rotating body is pushed by the paper sheets and separates from the conveying body, and the position restriction and rotation restraint by the stop member are released and the driven rotation body rotates. In order to detect the rotation of the body, it is equipped with a detected object that rotates in conjunction with the rotation of the driven rotating body, and a detector that detects the detected part of this detected object, so that when duplicate sheets pass, There is no problem with signal waveform breakage or chattering, and the detector outputs a detection signal that corresponds to the length of the important part of the paper sheet, making it ideal for forming reject signals or machine stop signals. The post-processing circuit is also easy to perform post-processing, and the reliability of the device as a duplicate paper sheet detection device can be significantly increased. Various excellent effects can be obtained, such as easy setting of the range, requiring the minimum number of glue jets, and being able to operate the paper sheet processing machine with high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the double feed detection device in a paper sheet processing machine according to the present invention, FIG. 2 is a schematic front view in a normal feeding state, and FIG. 3 is a schematic front view in a double feed state. FIG. 1.2... Conveyor belt, 4... Driving rotating body, 5... Driven rotating body, 7... Supporting member, 9...・Plate spring, 10... screws,
11...Press spring, 12...Detected object, 12'...Detected part, 13...Detector, 14... Detection device, 15...stop member, 17...adjustment member, 18...
・No adjustment, P...Paper sheets.

Claims (1)

[Scope of utility model registration request] A conveyor such as a conveyor belt or a conveyor roller that is driven to convey paper sheets to be processed, and the conveyor is installed so that its circumferential surface faces the conveyor, and is energized in the direction of the conveyor so that it can come into contact with and separate from the conveyor. regulating the approach position of the driven rotating body with respect to the conveying body so as to form a gate gap between the supported driven rotating body, the conveying body and the driven rotating body that allows passage of one sheet;
and a stop member that restrains the driven rotor so that it cannot rotate at the time of regulation, and the driven rotor is pushed by two or more sheets fed into the gate gap, and the stop member regulates the position and rotates. When the restraint is released, the detected parts are rotated in conjunction with the rotation of the driven rotating body that is continuously rotated by the paper sheet, and the detected parts are provided at a predetermined radial position from the center of rotation at a predetermined interval in the direction of rotation. 1. A priority feed detection device for a paper processing machine, comprising: a detected object that has been rotated; and a detector that detects passage of the detected object when the detected object is rotated.