JP5356782B2 - Double feed detection device, double feed detection method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting double feed with a function of performing correction in accordance with a detection medium to be used. <P>SOLUTION: This device for detecting double feed includes a light emitting means emitting light, a light receiving means detecting an amount of reception of the light by the light emitting means, a storage means for storing a first threshold value for determining the double feed and a second threshold value for determining the amount of receipt of the light without the double feed, a double feed determining means determining the double feed from the amount of receipt of the light by the light receiving means with the presence of the detection medium in reference to the first threshold value stored in the storage means, an average calculating means calculating the average of the amount of receipt of the light of the predetermined number of detection mediums when it is determined that there is no double feed by the double feed determining means, and a first light amount adjusting means adjusting the amount of the light emitted by the light emitting means when the average by the average calculating means exceeds the second threshold value stored in the storage means. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a double feed detection device, a double feed detection method, and a program that increase the double feed detection accuracy of a mark card reader installed in an installed automatic machine and a counter machine to cope with a difference in specifications of a mark card.

  Conventionally, multi-feed detection in a mark card reader mounted on an automatic machine and a counter machine is performed by multi-feeding, that is, the mark cards are overlapped and conveyed due to the difference in the amount of light transmitted from the light emitting sensor and transmitted through the mark card. Was detected.

  As a conventional technique related to double feed detection, for example, Patent Document 1 describes a technique that makes it possible to detect one sheet and two sheets by adjusting the amount of received light according to a stored table.

Further, Patent Document 2 discloses a technique for reading a plurality of locations on a single transport medium, detecting an abnormality of the apparatus or the medium, and determining whether or not the apparatus or medium is in a normal state. Yes.
JP 2000-172897 A Japanese Patent No. 3109774

  However, in Patent Documents 1 and 2, adjustment is performed by assuming that the conveyed medium is the same. That is, it does not have a correction function for differences in mark card specifications.

  However, in automatic machines and counter machines that have different specifications for each public stadium and handle many types of mark cards, the specifications of the mark cards differ from each other, resulting in a difference in the amount of transmitted light.

  Therefore, there is a possibility that erroneous detection may occur depending on the mark card to be used because sufficient double feed detection accuracy cannot be obtained.

  In addition, in order to increase double feed detection accuracy, the double feed detection level must be individually adjusted according to the mark card used in each stadium.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a multi-layer detection device having a function of performing correction in accordance with a detection medium to be used.

To solve the above problems, the double feed detection device of the present invention, a light emitting means for emitting light, light receiving means for detecting the quantity of light received by said light emitting means, by the light receiving unit when there is a test known medium When it is determined from the amount of received light that a double feed is determined by referring to a first threshold defined in advance for determining double feed, and the double feed determination means determines that double feed is not being performed. An average value calculating means for calculating an average value of the received light amount of the predetermined number of detection media, and an average value by the average value calculating means for determining the received light amount when the double feed is not performed when higher than the upper limit of the defined specified range to reduce the outgoing light amount of the light emitting means, and further comprising a, a first light quantity adjusting means for increasing the amount of light emission is lower than the lower limit of the prescribed range To do.

In the double feed detection method of the present invention, light is emitted by the light emitting means, the amount of light received by the light emitting means is detected by the light receiving means, and the double feed is determined from the amount of light received by the light receiving means when there is a detection medium. The predetermined number of times when the double feed is determined by the double feed determining means with reference to the first threshold value defined in advance and the multifeed determining means determines that the double feed is not performed. An average value of the received light amount of the detection medium is calculated by the average value calculating unit, and the first light amount adjusting unit is used in advance to determine the received light amount when the average value by the average value calculating unit is not double-fed. When it is higher than the upper limit of the specified range, the light emission amount of the light emitting means is decreased, and when it is lower than the lower limit of the specified range, the light emission amount is increased.

The program according to the present invention performs multiple feeding based on the process of emitting light by the light emitting means, the process of detecting the amount of light received by the light emitting means by the light receiving means, and the amount of light received by the light receiving means when there is a detection medium. A process for judging double feed by the double feed judging means with reference to a first threshold value defined in advance, and a predetermined time when it is judged by the double feed judging means that double feed is not made A process of calculating an average value of received light amounts of the plurality of detection media by an average value calculating unit, and an amount of received light when the average value by the average value calculating unit is not double-fed by a first light amount adjusting unit. The computer executes a process of decreasing the light emission amount of the light emitting means when it is higher than the upper limit of the predetermined range for determination, and increasing the light emission amount when lower than the lower limit of the predetermined range. That.

  According to the present invention, since the amount of transmitted light is corrected from the average value of the amount of light received from a plurality of detection media, it is possible to perform highly accurate double feed detection without being affected by the difference in specifications of the detection media.

  Next, the best mode for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of a double feed detection device according to an embodiment of the present invention. The double feed detection device includes a CPU 10, a memory 20, a D / A converter 30, an A / D converter 40, and a double feed detection sensor 50.

  The CPU 10 performs calculations using the memory 20 and controls the entire apparatus. The double feed detection sensor 50 includes a light emitting sensor 51 that emits light and a light receiving sensor 52 that receives light from the light emitting sensor 51.

  The D / A converter 30 adjusts the light emission sensor 51 and the light emission amount, the A / D converter 40 digitizes the light reception sensor 52 and the light reception amount, and the detected transmitted light amount is converted by the A / D converter 40. The CPU is notified.

  The mark card 60 passes between the light emitting sensor 51 and the light receiving sensor 52, and double feed is detected by the difference in the amount of transmitted light transmitted through the mark card 60.

  Note that the light emission amount is adjusted at the time of production and shipment, and the set value for the D / A converter 30 is stored in the memory.

  FIG. 2 is a functional block diagram of the double feed detection device according to the embodiment of the present invention. The double feed detection device includes a light amount detection unit 110, a double feed determination unit 120, a storage unit 130, an average value calculation unit 140, and a light amount adjustment unit 150.

  The light amount detection unit 110 detects the amount of light from the light emitting unit when the mark card is passing or without the mark card, and outputs the received light amount.

  The storage unit 130 stores a normal value when there is no mark card, a double feed determination, and a threshold value for one specified value. Note that the specified value for one sheet indicates an allowable range due to a difference in thickness of the mark card. In addition, the amount of light received when one sheet is conveyed is stored.

  The double feed determination unit 120 refers to the threshold for double feed determination stored in the storage unit 130 and determines whether the double feed is performed based on whether the amount of received light exceeds the threshold.

  The average value calculation unit 140 calculates an average value in the amount of received light when it is determined that one sheet is conveyed. At this time, an average value is calculated for a predetermined number of sheets.

  When the average value calculated by the average value calculation unit 140 exceeds the threshold value of the single sheet predetermined value stored in the storage unit 130, the light amount adjustment unit 150 falls within the threshold value of the single sheet predetermined value. The amount of emitted light is adjusted as follows.

  FIG. 3 is a diagram showing the amount of light received when the mark card is detected by the double feed detection sensor 50. The vertical axis represents the light reception level, and the horizontal axis represents time.

  The one-dot chain line is the threshold “card-less level” when there is no card to judge the normal amount of light received when the mark card does not cross the double feed detection sensor, and the thin line is the rule when there is one mark card The threshold value “one sheet specified range level” for determining the value “single sheet specified range level”, and the chain line indicates the threshold value “double feed detection level” for determining that two or more mark cards overlap. ", And the thick line indicates the amount of light received at that time.

  In the “no card level”, the amount of light received without a mark card is checked, and if the sensor is soiled by dust or the like, the amount of light emitted is increased and correction is performed.

  The “single specified range level” is used to determine the amount of light received by a single card that is not double-fed, and increases or decreases the amount of light emitted when the average value of the multiple received levels is outside the specified range. To make it within the specified range.

  The “double feed detection level” is a threshold value for detecting double feed. If the amount of received light is smaller than the “double feed detection level”, it is determined that two or more mark cards are overlapped and returned.

  In this way, corrections are made for differences in mark card specifications used in racetracks and the like, and a decrease in light reception level due to sensor contamination, and multifeed detection with high accuracy is always performed.

  FIG. 4 is a flowchart of the double feed detection device according to the embodiment of the present invention.

  When the power of the double feed detection device is turned on (step S11), the CPU sets the setting value adjusted at the time of production shipment and stored in the memory in the D / A converter (step S12).

  When a card is inserted into the apparatus (step S13), the card-free level is checked before the card is conveyed (step S14). At this time, it is determined whether or not the received light amount is below the cardless level (step S15). If the received light amount is below the cardless level, it is determined that the received light amount is decreased due to sensor contamination or the like. Then, the light emission amount is set in the D / A converter so as to be equal to or higher than the no card level (step S16). This completes the correction of the level decrease due to dirt or the like.

  If the amount of received light is equal to or greater than the no card level, the card is conveyed (step S17) and a double feed check is performed (step S18). At this time, it is determined whether the amount of received light is equal to or less than the double feed detection level (step S19). If the amount of received light is equal to or less than the double feed detection level, it is determined that the card is being double fed. The card is returned (step S20).

  On the other hand, if it is determined that the amount of received light is equal to or greater than the double feed detection level and the sheets are being conveyed one by one, it is determined whether or not the first sheet has been started after the operation is started (step S21). Stores the detected amount of received light and waits for the next card to be inserted.

In the detection of the second and subsequent sheets after the operation is started, an average value of the received light amounts detected so far is calculated, and it is determined whether or not the average value is within the specified range level of one sheet (step S22). If the average value is within the specified range level, it waits for the next card to be inserted with the same setting. On the other hand, if the average value does not fall within the specified range level, the amount of light emission is reduced to the D / A converter if it is higher than the upper limit of the range, and light is emitted to the D / A converter if it is lower than the lower limit of the range. It sets the light emission amount as the amount increases fall within specified range to wait for the next card is inserted (step S23).

  As for the average value, a prescribed number of average values is set in advance, and an average value for the prescribed number is calculated from a card inserted according to the setting. As a result, for example, it is possible to respond flexibly when a card is switched halfway.

  It is not necessary to check the level without a card each time. For example, the entire detection time can be reduced by configuring the cardless level to be performed every specified number of times.

  As another embodiment of the present invention, the basic configuration is as described above. However, by having a function implemented by an instruction from the upper side, setting is performed by an operator operation from the maintenance screen on the upper side, and the operation is performed. Sometimes it is possible to detect double feed with high accuracy from the beginning.

  According to the embodiment of the present invention, it is possible to correct the difference in transmitted light amount emitted from the light emitting sensor and transmitted through the mark card in consideration of the difference in transmitted light amount caused by the specification difference in each mark card. It is possible to detect double feeding of mark cards.

  Also, check the amount of transmitted light when there is no mark card during operation and when there is a mark card, and if it is out of the specified range, adjust the emitted light amount so that it is within the specified range. By correcting the difference in the amount of transmitted light due to different mark cards, it is possible to perform more accurate double feed detection.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments thereof, various modifications and changes can be made to these embodiments without departing from the broader spirit and scope of the invention as defined in the claims. is there.

It is a block diagram of the double feed detection apparatus which concerns on embodiment of this invention. It is a functional block diagram of the double feed detection device according to another embodiment of the present invention. It is an example of each threshold value and the amount of received light at the time of mark card detection. It is a flowchart figure of the double feed detection apparatus which concerns on embodiment of this invention.

Explanation of symbols

10 CPU
DESCRIPTION OF SYMBOLS 20 Memory 30 D / A converter 40 A / D converter 50 Double feed detection sensor 110 Light quantity detection part 120 Double feed judgment part 130 Storage part 140 Average value calculation part 150 Light quantity adjustment part

Claims (9)

A light emitting means for emitting light;
A light receiving means for detecting the amount of light received by the light emitting means ;
A light receiving amount by the light receiving unit when there is a test known medium, and double feed determining means for referring to the pre-defined first threshold value and for determining the double feeding determining double feed,
An average value calculating means for calculating an average value of the amount of light received by the predetermined number of the detection medium when it is determined that the double feeding is not performed by the double feeding determining means;
Average value by the average value calculating means reduces the outgoing light amount of the light emitting unit is higher than the upper limit of the predefined defined range to determine the amount of light received when not fed at, the prescribed range And a first light amount adjusting means for increasing the light emission amount when lower than a lower limit . If the previous SL received light amount by the light receiving means when no detection medium is lower than a predefined second threshold value for determining the normal amount of light received when there is no the detection medium, outgoing of the light emitting means The double feed detection device according to claim 1, further comprising: a second light amount adjustment unit that adjusts a light amount so as to be equal to or greater than the second threshold value . 3. The multifeed detection apparatus according to claim 2, wherein the second light amount adjusting means performs the adjustment every predetermined number of times.   Light is emitted by the light emitting means,
  The amount of light received by the light emitting means is detected by the light receiving means,
  From the amount of light received by the light receiving means when there is a detection medium, refer to a first threshold defined in advance for determining double feed by the double feed determination means,
  An average value calculation unit calculates an average value of received light amounts of the predetermined number of detection media when it is determined by the multifeed determination unit that double feeding is not performed,
  When the average value obtained by the average value calculating means is higher than the upper limit of a predetermined range for determining the amount of received light when the multi-feed is not performed by the first light amount adjusting means, the light emission amount of the light emitting means A double feed detection method for reducing the amount of light emission and increasing the amount of light emission when lower than the lower limit of the specified range. When the amount of light received by the light receiving unit when there is no detection medium is lower than a second threshold value that is defined in advance to determine the normal amount of light received when there is no detection medium, the second light amount adjustment unit The multifeed detection method according to claim 4, wherein the light emission amount of the light emitting means is adjusted to be equal to or greater than the second threshold. The multifeed detection method according to claim 5, wherein the second light amount adjusting unit performs the adjustment every predetermined number of times.   A process of emitting light by a light emitting means;
  A process of detecting the amount of light received by the light emitting means by the light receiving means;
  A process of determining double feed by the double feed determining means with reference to a first threshold value defined in advance for determining double feed from the amount of light received by the light receiving means when there is a detection medium;
  A process of calculating an average value of the amount of received light of the predetermined number of detection media when it is determined by the multifeed determining means that the multifeed is not performed, by an average value calculating means;
  When the average value obtained by the average value calculating means is higher than the upper limit of a predetermined range for determining the amount of received light when the multi-feed is not performed by the first light amount adjusting means, the light emission amount of the light emitting means A process of increasing the amount of luminescence when lower than the lower limit of the specified range,
  A program to be executed by a computer. When the amount of light received by the light receiving unit when there is no detection medium is lower than a second threshold value that is defined in advance to determine the normal amount of light received when there is no detection medium, the second light amount adjustment unit To adjust the light emission amount of the light emitting means to be equal to or greater than the second threshold,
  8. The program according to claim 7, which is executed by a computer. A process of performing the adjustment every predetermined number of times determined in advance by the second light quantity adjustment means.
The program according to claim 8, which is executed by a computer.

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