JPS64292B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a thin piece traveling monitoring device that monitors changes in the amount of light transmitted through a thin piece running between a light emitting part and a light receiving part, and monitors and detects the running of two or more thin pieces. Conventional technology Conventionally, in various devices that have a flake separation function that separates and conveys flakes one by one, separation is not performed completely and it is unavoidable that two or more flakes are transported at the same time. It was necessary to monitor. Conventionally, in a method that uses the amount of light transmitted between the light emitting part and the light receiving part for running monitoring, when one thin film is running, the amount of light received by the light receiving part is above a certain value, and when two films are running, the amount of light received by the light receiving part is below a certain value. This was done by adjusting the amount of light emitted by the light emitting part or by adjusting the light receiving sensitivity of the light receiving part. However, this method assumes that the amount of light transmitted through the traveling flake is constant, and if the thickness of the flake is undefined, or if the thickness is constant but the amount of light transmitted is indeterminate, the running state may change. Accurate monitoring is not possible;
It was necessary to readjust the light emitting section and the light receiving section every time the amount of light transmission changed. Purpose of the Invention The present invention was made in view of the above-mentioned drawbacks, and detects the amount of light received by the light receiving section, and determines whether or not there has been a change in the amount of light transmitted from the initial amount of light transmitted through the thin section. Monitor and if there is a change in the amount of light transmitted,
By determining that more than one sheet is traveling, there is no need to make adjustments each time, even when thin sheets with different amounts of light transmission are mixed together, or when processing thin sheets with different amounts of light transmission. The purpose of the present invention is to provide a thin section running monitoring device with a simple structure and extremely high accuracy. Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a top view of a magnetic ink character printing device (hereinafter referred to as MICR encoder) incorporating a flake monitoring device according to an embodiment of the present invention. In the figure, 1 is a hopper that supplies recording paper such as checks and bills, 2 is a MICR encoder section, 3 is a recording paper presser plate of the hopper, 4 is a recording paper such as checks and bills, and 5 is a recording paper supply of hopper 2. Rollers 6 and 7 are separation rollers that separate the recording sheets fed from the hopper 2 one by one. 6 is a running roller that rotates in the recording paper running direction, and 7 is a reversing roller that rotates at a low speed in the opposite direction to the running direction. It's Laura. 8a and 8b are conveyance rollers that convey the recording paper separated one by one by separation rollers 6 and 7 and conveyed to the encoder section; 9a and 9b are conveyance rollers 8;
constant speed rollers 10a, 1 that run the recording paper conveyed by a, 8b at a constant speed in synchronization with printing;
0b is a high-speed roller that discharges the printed recording paper to a stacker (not shown) at high speed, and 11 is a MICR type on a MICR type wheel located at the bottom of constant speed roller 9b (not shown), which drives a chip at the bottom of constant speed roller 9a (not shown). a hammer 12 for transferring the image from the magnetic ink on the corresponding ribbon 18 onto the recording paper;
12a and 12b are double feed sensors for checking the double feed of recording paper;
is a light emitting part, and 12b is a light receiving part. 13 is a magnetic ink ribbon cassette, 14 is a ribbon receiver, 15 is a take-up reel for winding up the recorded ribbon, 16
is a ribbon running roller for running the ribbon, 1
8 is a magnetic ink ribbon from a magnetic ink ribbon cassette 13. An outline of the operation of the MICR encoder having the above configuration will be explained below. A piece of paper 4 to be printed with magnetic ink (hereinafter referred to as MICR printing), such as a check or a bill, stored in the hopper 2 is pressed against a recording paper supply roller 5 by a recording paper pressing plate 3. In this state, the supply roller 5 on the nearest supply roller 5 side
The supply roller 5 is rotated in the direction of the arrow in order to perform MICR printing on the piece of paper pressed against the paper. As a result, the paper pieces pressed against the supply roller 5 are sent toward the separation rollers 6 and 7. When the paper reaches the positions of the separation rollers 6 and 7, only one piece of paper is separated by the running roller 6 and the reversing roller 7, and is sent toward the conveyance rollers 8a and 8b. A cross-sectional view of this separation roller in the AA direction is shown in FIG. As shown in Figure 2, the outer periphery of the running roller 6 that rotates in the running direction of the paper strip is arranged so that it slightly cuts into the cut groove 23 provided around the entire circumference of the reversing roller 7 that rotates at low speed in the opposite direction to the running direction. has been done. Here, 21 and 22 are shafts, and the separation rollers 6 and 7 are rotatably fitted into these shafts 21 and 22. The pieces of paper are pressed against the cut groove 23 and the outer periphery of the running roller 6, and are slightly embedded in the cut groove 23, so that even if two pieces of paper are in close contact with each other, they can be effectively separated by the reversing roller 7. . The paper pieces separated by the separation rollers 6 and 7 in this way are transported by the running roller 6 to the conveyance rollers 8a and 8.
Sent to b. Then, the conveyance roller 8a,
At step 8b, it is conveyed to constant speed rollers 9a and 9b. When the piece of paper is conveyed to the positions of constant speed rollers 9a and 9b, the paper piece is detected by a paper piece edge sensor (not shown), and the recording paper supply roller 5, running roller 6,
The conveyance rollers 8a and 8b are stopped, and the conveyance rollers 8
a and 8b are rotatable, and thereafter the paper pieces are run by constant speed rollers 9a and 9b. At this point, only the reversing roller 7 continues to rotate to prevent the next piece of paper from being erroneously conveyed. The traveling distance of the paper piece detected by the paper piece edge sensor described above is determined by the rotation angle of the constant speed roller 9a. This constant speed roller 9a is driven by a stepping motor (not shown), and its rotation amount is accurately controlled to determine the printing position. A piece of paper is run by constant speed rollers 9a, 9b,
When the MICR printing position and the printing type position of the type wheel (not shown) are in opposing positions, the hammer 11 is driven by the solenoid 19 so that the magnetic ink on the ribbon 18 is transferred to the piece of paper, and the chip (not shown) is ejected onto the piece of paper. magnetic ribbon 1 between the piece of paper and the type.
8 and printed letters are pressed against a piece of paper to correspond to the printed letters.
Perform MICR printing. Next, ribbon feed roller 1
6, the ribbon is wound up for one character, the type wheel is rotated to the position where the next printed type is facing the chip, and the paper piece is moved to the next position by constant speed rollers 9a and 9b.
It is sent to the MICR printing position. Then, the next MICR printing is performed in the same manner as described above. MICR printing is performed sequentially, and when the necessary MICR printing is completed, the constant speed roller 9b changes to the constant speed roller 9a.
Then, the high-speed roller 10b comes into pressure contact with the high-speed roller 10a and is discharged at high speed to a stacker (not shown). Here, the ribbon running state of the magnetic ink ribbon is determined by detecting the ribbon breakage, ribbon meandering, ribbon breakage, ribbon meandering, etc. This system monitors whether the amount of light transmitted deviates from a certain value due to ink peeling, etc., and prevents printing defects from occurring. Furthermore, if there is a double field or the like in the pieces of paper separated by the separation rollers 6 and 7, and two or more pieces of paper are conveyed, it is absolutely necessary to avoid MICR printing by mistake. Therefore, in order to monitor whether two or more pieces of paper have been conveyed, paper piece traveling sensors 12a, 12b are provided between the conveying rollers 8a, 8b and constant speed rollers 9a, 9b. This sensor section includes a light emitting section 12a and a light receiving section 12b.
The details of this paper traveling sensor are shown in FIG. Reference numeral 30 denotes a paper guide, and a light emitting element 33 is arranged at the rear of a hole 31 made in the paper guide 30. A hole 32 is made at the position of the paper guide opposite to the optical axis of this light emitting element 33, and a light receiving element is provided at the rear of the hole 31. A light emitting element 33 is arranged.
It is receiving more light. In this embodiment, a near-infrared light emitting diode is used as a light emitting element. FIG. 4 is a detailed circuit diagram of a determining section that determines the traveling state of a piece of paper based on the light reception signal from the light receiving element 34. In the figure, 33 and 34 correspond to the light emitting element 33 and the light receiving element 34 shown in FIG. 40 is an amplifier, 41 is a reference level generating section, 42 to 44 are comparators, 45 is a timer, 46 is a flip-flop F/F, and 50 is a determining section. The light emitted by the light emitting element 33 is transmitted to the light receiving element 3.
4, and a received light signal corresponding to the amount of received light is amplified by an amplifier 40, and then sent to comparators 1 to 3 and 4.
2 to 44 are input. Then, it is compared with the reference levels A to C generated by the reference level generating section 41. When there is no piece of paper between the light emitting element 33 and the light receiving element 34, the output level of the amplifier 40 is higher than the reference level A, and the outputs of the comparators 1 and 42 are in an on state. Next, when the piece of paper comes between both elements, the output level from the amplifier 40 decreases, and the reference level A
As a result, the outputs of the comparators 1 and 42 become off rather than on. Then, after the time set by the timer 45 has elapsed, the flip-flop 46 is set, and the determination unit 50
A D1 signal 47 is output. The timer 45 guarantees the time during which the output level of the light receiving element 34 becomes stable. Here, if the thickness of the piece of paper is thin, the output signal level of the amplifier 40 will be lower than the reference level A and the reference level B.
As described above, only the D1 signal 47 is output to the determination section 50. When the paper thickness of the piece of paper is thick, the output signal level of the amplifier 40 will be lower than the reference levels A and B and the reference level C.
As described above, the D1 signal and the D2 signal 48 are output to the determination section 50. If the pieces of paper are not completely separated by the aforementioned separation rollers 6 and 7, there is a possibility that two or more pieces of paper will be conveyed overlapping each other, but even in this case, the paper pieces will be separated by the action of the reversing roller 7. They are transported in a state where they are shifted, that is, in a state where they are slightly shifted. In this case, a change occurs in the input signal to the determination unit 50 at the time when the piece of paper arrives. If this changed state lasts only for a short period of time, it is assumed that the conveyance is normal, since it is not caused by overlapping paper pieces, but by a stamp being pasted on the paper pieces, or by the printing condition. However, if the state differs from the initial state for more than a certain period of time, it is assumed that two or more pieces of paper have been conveyed, printing on subsequent pieces of paper is stopped, and the operator is notified. The judgment control flowchart in the judgment unit 50 is shown in the fifth figure.
As shown in the figure. First, in step 100, the D1 signal 4 shown in FIG.
Monitor 7. The pieces of paper are the light emitting element 33 and the light receiving element 3
When the time reaches 4, the D1 signal 47 is set, and the process advances from step 100 to step 102. Next, it is checked whether the D2 signal 48 is set. This is to check whether the piece of paper is thick or not. If the D2 signal 48 is set, it is assumed that the paper is thick, and the D2 flag is set in step 104.
If the D2 signal 48 is not set, it is determined that the paper is thin, and the process proceeds to step 106. Step 10
At step 6, it is checked whether the D3 signal 49 is set, and if it is set, the process proceeds to step 114 and waits for timer A time to elapse. After the timer A time has elapsed, it is checked again in step 116 whether or not the D3 signal 49 is set, and if it is set, the paper is
The error processing from step 122 onward is executed assuming that the number of duplicates is more than one. If the D3 signal 49 is not set after the timer time has elapsed, it means that a stamp or the like was pasted on the piece of paper or that the D3 signal 49 was temporarily set for printing, so execute steps 106 onwards ( (Continue monitoring paper strips). If the D3 signal 49 is not set in step 106, it is checked in step 108 whether the D2 signal 48 is set. If the D2 signal 48 is set here, step 110 is performed.
Proceed to and check whether the D2 flag is set. This is to check whether the piece of paper is thick or not. If the D2 flag is set, it indicates that the piece of paper is thick, and the process advances to step 112. If the piece of paper is not paper thick, that is, if the D2 flag is not set, step 118 is executed.
Wait for the timer time to elapse, and if the D2 signal remains set after the timer A time elapses,
Step 11 since two or more pieces of paper are being conveyed.
Similarly to step 6, the error processing from step 112 onwards is executed. If the D2 signal 48 is reset after the timer A time has elapsed, it is assumed that two or more pieces of paper have not been conveyed, and the process proceeds to step 106 similar to step 116.
Return to and continue monitoring the paper strip. If the D2 signal 48 is not set in step 108, or if the D2 signal 48 is set but the D2 flag is also set, it is a normal state, and in step 112 it is determined whether the D1 signal 47 is set or not. If the D1 signal 47 is set, the piece of paper is connected to the light emitting element 33 and the light receiving element 3.
Since the vehicle is currently running between 4 and 4, the vehicle returns to station 106 and continues monitoring the pieces of paper. If the D1 signal 47 is in the reset state at step 112, the piece of paper is connected to the light emitting element 33 and the light receiving element 34.
Since the space has passed, the process returns to step 100 and waits for the piece of paper to be sent between the light emitting element 33 and the light receiving element 34 again. Three types of paper, No. 1; 0.09 mm, No. 2; 0.16 mm, No. 3; 0.19 mm, were used as paper pieces to form the light emitting element 33 and the light receiving element 34.
The change in the output voltage of the amplifier 40 was actually measured using a piece of paper by changing the distance 1 to 5.0 mm, 5.5 mm, and 6.0 mm, and the results shown in Table 1 below were obtained.

[Table] In addition, the output voltage of the amplifier 40 when two sheets of paper were combined was actually measured, and the results shown in Table 2 below were obtained.

[Table] From the above results, in this example, reference level A =
2.5V, B=1.4V, and C=0.8V. As mentioned above, paper strips are separated into two types depending on the amount of light transmitted due to differences in paper thickness, paper quality, etc., and the separation roller 6,
By using the function of 7, the overlapping pieces of paper are separated and run in a slightly misaligned manner,
In the discriminator 50, the first document that passes through is classified, and subsequent changes in the amount of penetration are monitored. If the change in light transmission is temporary, it is considered as a change in a single piece of paper, and if the change in light transmission is continuous, it is determined that two or more pieces of paper are running. However, before entering the printing state, paper conveyance error processing is performed. In this embodiment described above, the amount of light transmitted through the traveling paper strips is divided into three stages and the running of two or more pieces of paper is monitored. It can handle paper of various thicknesses in detail. In addition, the initial amount of light transmission is measured as an analog value, and this measurement value is used as a reference value to monitor whether the subsequent change in the amount of light transmission is within a certain range, and if the change exceeds a certain amount continues for a predetermined period of time. Of course, even if a running abnormality occurs in such a case, the same effects as in this embodiment can be obtained. Furthermore, although the explanation was given using a piece of paper as an example, if it has the property of transmitting light, the same effect can be achieved on plastic, polyethylene film, and other thin pieces by monitoring changes in the amount of light transmitted. It will be done. Effects As explained above, according to the present invention, the amount of light transmitted between the light emitting part and the light receiving part is monitored, and the amount of light transmitted through the first thin piece is compared with the amount of light transmitted thereafter.
By running two or more sheets when a change in the amount of light transmission is detected, it can be used even when thin pieces with different amounts of light transmission are mixed together, or when processing thin pieces with different amounts of light transmission. Therefore, there is no need to make adjustments each time, and a thin section running monitoring device with a simple structure and extremely high accuracy can be realized. In addition, by comparing the amount of transmitted light and running two or more sheets when the change in light amount continues for a certain period of time or more, a thin film running monitoring device can be realized that can effectively deal with printing unevenness and the like.

[Brief explanation of the drawing]

FIG. 1 is a top view of a magnetic ink printing device incorporating a flake monitoring device according to an embodiment of the present invention, FIG. 2 is a sectional view of a separation roller of the magnetic ink printing device, and FIG.
The figure shows the structure of the paper traveling sensor of this embodiment.
FIG. 4 is a detailed circuit diagram of the paper strip running monitoring unit of this embodiment.
FIG. 5 is a control flowchart of the determination section of the paper piece running monitoring section. In the figure, 6... traveling roller, 7... reversing roller, 9a, 9b... constant speed roller, 10a, 10
b...High speed roller, 12a...Paper running sensor light receiving element, 12b...Paper running sensor light emitting element, 1
3...Magnetic ink ribbon cassette, 17a, 17
b...Ribbon running sensor, 41...Reference level generation unit, 42-44...Comparator, 50...Discrimination unit.

Claims (1)

[Scope of Claims] 1. A light-emitting means, a light-receiving means for receiving light from the light-emitting means, which is disposed opposite to the light-emitting means via a flake running path, and an amount of light received by the light-receiving means. a first detection means for detecting flake travel when the amount of light is less than a predetermined light amount; a comparison means for comparing the light amount value received by the light receiving means with at least two threshold values held in advance; monitoring means for monitoring whether or not there is a change in the received light amount value inputted to the comparison means during detection compared to the comparison result between the received light amount value at the time of the initial detection of thin film running by the first detecting means and a threshold value; A thin piece running monitoring device, characterized in that the monitoring means determines that two or more thin pieces are running when the monitoring means detects a change in the comparison result of the comparing means. 2. The flake traveling monitoring device according to claim 1, wherein the monitoring means determines that two or more flakes are running when the change state of the comparison result of the comparing means continues for a predetermined period of time or more.