JP5549486B2 - Label inspection system - Google Patents

Description

  The present invention relates to a technique for inspecting the number of labels stacked on a sheet such as a seal and a hologram.

  In order to inspect the number of labels stacked on paper such as stickers and holograms, for example, as disclosed in Patent Document 1, the paper is flowed and is laminated on the paper using a reflective or transmissive optical sensor. A widely used method is to detect the presence of a label and count the number of labels.

  When counting the number of labels stacked on paper using a reflective or transmissive optical sensor, if there is curling or flapping of the paper with the labels stacked, the output of the optical sensor that detects the label will be chattered, etc. As a result, an error occurs in the number of labels, and the number of labels cannot be guaranteed for each sheet in roll form.

  As disclosed in Japanese Patent Application Laid-Open No. 2004-228867, a paper on which a label is laminated is disclosed as a technique for normally detecting a label with a reflective or transmissive optical sensor even if the paper on which the label is laminated is curled or fluttered. A method of physically suppressing flapping of the paper on which the labels are stacked is conceivable within a range in which the members are pressed from the back side of the paper and the labels are optically detected.

Japanese Patent Laid-Open No. 9-259245 JP 2007-21744 A

  However, Patent Document 2 is an invention that focuses on improving the detection accuracy of marks printed on paper, and the invention disclosed in Patent Document 2 is applied to the inspection of the number of labels stacked on paper. As a result, the detection accuracy of labels stacked on paper can be improved. However, when checking the number of security-related labels, the optical sensor used for label detection malfunctions and the If even a slight error occurs in the number, the quality will be poor in terms of the number inspection. Therefore, it is necessary to detect the malfunction of the optical sensor that occurred during the number inspection of the label and improve the quality of the number inspection of the label. become.

  Therefore, the present invention can detect a malfunction of the sensor that occurred during the label count inspection in the apparatus for inspecting the count of the labels stacked on the paper by using a sensor such as an optical sensor, thereby improving the quality of the label count inspection. It is an object to provide an apparatus that can be improved.

  The first invention for solving the above-described problems is arranged so that a malfunction that is caused during the label count inspection can be detected, with a gap shorter than the length of the label in the flow direction in the flow direction. Monitoring the output signals of the first sensor and the second sensor that are turned on when the output signal is detected, and the first sensor and the second sensor when the label-laminated paper is flowing, When a behavior other than the signal pattern in which the output signal of the second sensor arranged on the downstream side is turned ON while the output signal of the first sensor arranged on the upstream side is ON, the first sensor A label number inspection apparatus comprising: a number inspection unit that determines that one or both of the first sensor and the second sensor malfunctions.

  Furthermore, the second invention is the label number inspection device according to the first invention, wherein the number inspection means detects the occurrence of a behavior other than the signal pattern so that the output signal of the first sensor is The first internal state in which the transition is set to ON when the output signal of the second sensor rises to ON, and the state transition to transition to OFF when the output signal of the second sensor rises to ON, and the output signal of the second sensor is ON When the output signal of the first sensor rises to ON, the state transition of the second internal state in which the state transition of transition to OFF is set when the output signal of the first sensor falls to OFF is held, and the first sensor And transition of the first internal state and the second internal state in accordance with respective state transitions based on the change in the signal of the second sensor, and the first internal state is the state of the first internal state Transition according to transition If you can not, it determines that the first sensor is determined to have a malfunction, when the second internal state can not transition depending on the state transition of the second internal state, the second sensor malfunctions.

  Furthermore, a third invention is the label number inspection apparatus according to the second invention, in order to detect a state in which both the output signals of the first sensor and the second sensor do not rise to ON. The number inspection means measures the time when the output signals of the first sensor and the second sensor are both OFF, and when the time reaches a first predetermined time, It is determined that both the second sensor and the second sensor have malfunctioned.

  Furthermore, a fourth invention is the label number inspection apparatus according to the third invention, wherein the first predetermined used for determining that both the first sensor and the second sensor have malfunctioned. In order to be able to automatically determine the time, the number inspection means measures the time when the output signals of the first sensor and the second sensor are both OFF a predetermined number of times. A value obtained by multiplying the average value by one or more coefficients is used as the first predetermined time.

  Furthermore, a fifth invention is the label quantity inspection device according to any one of the second to fourth inventions, wherein the quantity inspection means includes the first sensor and the second sensor. In order to detect a state in which both of the output signals of the first sensor and the second sensor do not fall OFF, the time when the output signals of the first sensor and the second sensor are both ON is measured, When the predetermined time of 2 is reached, a process of determining that both the first sensor and the second sensor have malfunctioned is executed.

  Further, a sixth invention is the label number inspection apparatus according to the fifth invention, wherein the second predetermined used for determining that both the first sensor and the second sensor have malfunctioned. The time when the output signals of the first sensor and the second sensor are both ON is measured a predetermined number of times so that the time can be automatically determined, and the average value of the measured time is 1 or more. A value obtained by multiplying the coefficient is used as the second predetermined time.

  Further, a seventh invention is the label number inspection device according to any one of the second to sixth inventions, wherein the number inspection means counts the number of labels. When the internal state of 1 falls to OFF, the counter used for label count inspection is incremented, then a code indicating normality is given, the incremented counter value is stored, and the first sensor Alternatively, when it is determined that any one of the second sensors has malfunctioned, after the counter is incremented, a code corresponding to the determined malfunction is assigned, and a process of storing the incremented counter value is executed.

  Furthermore, an eighth invention is the label number inspection device according to any one of the second to seventh inventions, wherein the number inspection means cancels chattering caused by paper flapping. In addition, for each output signal of the first sensor and the second sensor, the time after the output signal is turned on is measured, and when the time reaches a third predetermined time, the output signal is turned on. A process for determining that it has started is executed.

  Further, the ninth invention is the label number inspection device according to the eighth invention, wherein a third predetermined time used for canceling chattering caused by paper flapping can be automatically determined. For each output signal of the first sensor and the second sensor, the time after the output signal is turned on is measured a predetermined number of times, and the average value of the measured times is multiplied by a coefficient less than 1. This is used as the third predetermined time.

  Furthermore, a tenth invention is the label quantity inspection device according to any one of the first invention to the ninth invention, wherein the flow of separate paper is prevented in order to prevent mixing of labels printed with defective marks. A third sensor for detecting a defective mark printed on a label is arranged upstream of the first sensor in the direction, and when the third sensor detects the defective mark, a number inspection process is performed. Execute the process to be interrupted.

  As described above, according to the present invention described above, in a device for inspecting the number of labels stacked on a sheet using a sensor such as an optical sensor, it is possible to detect a malfunction of the sensor that occurred during the inspection of the number of labels. It is possible to provide an apparatus capable of improving the quality of the number inspection.

The figure explaining the structure of the label number inspection apparatus 1. FIG. The figure explaining arrangement | positioning of a 1st sensor, a 2nd sensor, and a 3rd sensor. The figure explaining the state transition of the 1st internal state and the 2nd internal state. The figure explaining the case where the output signal of the 1st sensor does not rise to ON. The figure explaining the case where the output signal of a 2nd sensor does not rise to ON. The figure explaining the case where the output signal of the 1st sensor does not fall off. The figure explaining the case where the output signal of a 2nd sensor does not fall to OFF. The figure explaining the case where the output signal of both the 1st sensor and the 2nd sensor does not rise to ON. The figure explaining the case where the output signal of both the 1st sensor and the 2nd sensor does not fall off, and cannot be cut. The figure explaining the state when chattering generate | occur | produces in the output signal of a 1st sensor.

  From this, the embodiments of the present invention will be described to the extent that those skilled in the art of the present invention can understand the contents of the present invention and implement the present invention.

  FIG. 1 is a diagram for explaining the configuration of a label number inspection apparatus 1 according to this embodiment. The label number inspection apparatus 1 according to the present embodiment detects the label 3 using an optical sensor while flowing a separate paper 3a on which a label 3 such as a sticker is pasted, and takes up each roll wound in a roll shape. As shown in FIG. 1, the label number inspection device 1 is an apparatus developed for the purpose of performing the number inspection of the label 3, and the label number inspection device 1 includes a first sensor 10 that is an optical sensor for detecting the label 3 and a first sensor 10. 2 and the number of labels 3 using the output signals of the first sensor 10 and the second sensor 11, and the number inspection for detecting the malfunction of the first sensor 10 and the second sensor 11. It comprises a PLC 12 (Programmable Logic Controller) functioning as a means. The PLC 12 displays a display 13 for displaying the number of labels 3 and a support for storing the number 3 results of labels 3. Bar 2 is connected.

  In addition, the label count inspection apparatus 1 of the present embodiment is provided with a third sensor 14 that is an optical sensor for detecting a defective mark printed on the label 3, and the third sensor 14 is also connected to the PLC 12. It is connected.

  FIG. 2 is a diagram for explaining the arrangement of the first sensor 10, the second sensor 11, and the third sensor 14. FIG. 2 (a) shows the imposition of the label 3 according to the present embodiment. 2 (b) shows the arrangement of the first sensor 10, the second sensor 11, and the third sensor 14.

  As shown in FIG. 2A, the imposition of the label 3 in the width direction perpendicular to the flow direction is one surface, and perforations are provided between the labels 3. Since the imposition of the label 3 in the width direction is a single imposition, as shown in FIG. 2B, the first sensor 10, the second sensor 11, and the third sensor are arranged in the width direction of the separate paper 3a. 14 is provided, and when the imposition of the label 3 in the width direction is multi-face imposition, the first sensor 10, the second sensor 11 and the third sensor 14 are multi-face imposition in the width direction of the separate paper 3a. A plurality are provided according to the number.

  In this embodiment, the reason why the label 3 is detected by using the first sensor 10 and the second sensor 11 is to detect a malfunction of the sensor that has occurred during the number inspection of the label 3. In order to be able to detect the malfunction of the sensor that occurred during the quantity inspection of the label 3, the flow direction of the label 3 of the first sensor 10 and the second sensor 11 as shown in FIG. The interval L1 is set to be shorter than the length L0 of the label 3 in the flow direction.

  While the first sensor 10 and the second sensor 11 set the interval in the flow direction of the label 3 to be shorter than the length of the label 3 in the flow direction, the first sensor 10 is detecting the label 3. In addition, the label 3 detected by the first sensor 10 can be detected by the second sensor 11, and if the first sensor 10 and the second sensor 11 do not malfunction, the flow direction of the separation paper 3a While the output signal of the first sensor 10 installed on the upstream side of the paper is ON, a signal pattern in which the output signal of the second sensor 11 installed on the downstream side in the flow direction of the separate paper 3a rises to ON is generated Will do.

  Therefore, the output signals of the first sensor 10 and the second sensor 11 when the sheet on which the label 3 is laminated are being flowed are monitored, and if a behavior other than the signal pattern occurs, the first sensor 10 and It can be determined that either or both of the second sensors 11 have malfunctioned.

  For example, if the second sensor 11 does not detect the label 3 even though the first sensor 10 detects the label 3, it can be determined that the second sensor 11 has malfunctioned. If the second sensor 11 detects the label 3 despite the fact that the label 3 is not detected by the sensor 10, it can be determined that the first sensor 10 has malfunctioned.

  It should be noted that the distance between the first sensor 10 and the second sensor 11 is adjusted so that the distance between the first sensor 10 and the second sensor 11 can be adjusted according to the length of the label 3 to be inspected in the flow direction. It is preferable to provide a mechanism for adjusting the label number inspection apparatus 1 in advance.

  The PLC 12 monitors the output signals of the first sensor 10 and the second sensor 11 when the separate sheet 3a on which the label 3 is laminated is flowing, and while the output signal of the first sensor 10 is ON. When a behavior other than the signal pattern in which the output signal of the second sensor 11 rises to ON occurs, it functions as a number inspection means that determines that one or both of the first sensor 10 and the second sensor 11 malfunctions. In the apparatus, a ladder for determining malfunction of the first sensor 10 and the second sensor 11 is incorporated in the PLC 12.

  In the present embodiment, the PLC 12 has two states of ON and OFF, and each of the first internal state and the second internal state in which different state transitions are set flows the sheet on which the label 3 is laminated. The output signal of the second sensor 11 is turned ON while the output signal of the first sensor 10 is ON by making transition according to the output signals of the first sensor 10 and the second sensor 11 Confirm that a behavior other than the rising signal pattern has occurred. Each internal state is realized by using a relay on the ladder.

  FIG. 3 is a diagram illustrating state transitions of the first internal state and the second internal state according to the present embodiment, and FIG. 3A is a state transition of the first internal state and the second internal state. FIG. 3B is a time chart of the output signals of the first sensor 10 and the second sensor 11, and the first internal state and the second internal state.

  As shown in FIG. 3A, each of the first internal state and the second internal state according to the present embodiment has two states, ON and OFF, and the first internal state according to the present embodiment. The second internal state transitions using the two output signals of the first sensor 10 and the second sensor 11, respectively.

  The event when the first internal state according to the present embodiment transitions from OFF to ON is the rise of the output signal of the first sensor 10, and the event when the first internal state transitions from ON to OFF is , The output signal of the second sensor 11 rises.

  Also, the event when the second internal state according to the present embodiment transitions from OFF to ON is the rise of the output signal of the second sensor 11 and the second internal state transitions from ON to OFF. The event is a fall of the output signal of the first sensor 10.

  The first sensor 10 is disposed upstream of the second sensor 11 in the flow direction of the separate paper 3a, and the interval in the flow direction of the labels 3 of the first sensor 10 and the second sensor 11 is as follows. Since the label 3 is set to be shorter than the length in the flow direction, the first sensor 10 and the second sensor 11 have no malfunction as shown in the time chart of FIG. While the output signal of the sensor 10 is ON, a signal pattern in which the output signal of the second sensor 11 rises to ON is generated.

  Further, if a signal pattern in which the output signal of the second sensor 11 rises to ON while the output signal of the first sensor 10 is ON is generated, as described below, The internal state and the second internal state transition according to the state transition set for each.

  As shown in FIG. 3B, in the signal pattern in which the output signal of the second sensor 11 rises to ON while the output signal of the first sensor 10 is ON, first, Since the first sensor 10 detects the label 3 and the output signal of the first sensor 10 rises to ON, the first internal state transitions from OFF to ON (time T1 in FIG. 3).

  Since the second sensor 11 is installed downstream of the first sensor 10 in the flow direction of the separate paper 3a, the second sensor 11 detects the label 3 detected by the first sensor 10. When the output signal of the second sensor 11 rises to ON, the first internal state transitions from ON to OFF (time T2 in FIG. 3).

  Furthermore, when the output signal of the second sensor 11 rises to ON, the first internal state changes from ON to OFF, and at the same time, the second internal state changes from OFF to ON (time T2 in FIG. 3). ) When the first sensor 10 no longer detects the label 3 and the output signal of the first sensor 10 falls to OFF, the second internal state transitions from ON to OFF (time T3 in FIG. 3).

  When a malfunction occurs in either the first sensor 10 or the second sensor 11, a signal that causes the output signal of the second sensor 11 to rise to ON while the output signal of the first sensor 10 is ON. Since the behavior other than the pattern occurs and the first internal state or the second internal state cannot change the state set to each, the PLC 12 changes the output signals of the first sensor 10 and the second sensor 11. Based on the state transition diagram shown in FIG. 3A, a process for transitioning the first internal state and the second internal state according to the state transition of FIG. It is determined that either the first sensor 10 or the second sensor 11 has malfunctioned, depending on the internal state that could not be changed.

  From here, the PLC 12 detects the first sensor 10 and the second internal state from the state transition of the first internal state and the second internal state while showing a case of malfunction of the first sensor 10 and the second sensor 11. The contents for determining malfunction of the sensor 11 will be described.

  FIG. 4 is a diagram illustrating a case where the output signal of the first sensor 10 does not rise to ON. When the output signal of the first sensor 10 does not rise to ON, it can be determined from the first internal state that the first sensor 10 has malfunctioned.

  The rise of the output signal of the first sensor 10 is used as an event for transitioning the first internal state from OFF to ON, but when the output signal of the first sensor 10 does not rise to ON (time in FIG. 3). T4) Even if the output signal of the second sensor 11 rises (time T5 in FIG. 3), the first internal state does not transition to ON but remains OFF, and the first internal state changes from ON to OFF. Therefore, it can be determined that the first sensor 10 has malfunctioned.

  FIG. 5 is a diagram illustrating a case where the output signal of the second sensor 11 does not rise to ON. When the output signal of the second sensor 11 does not rise to ON, it can be determined from the second internal state that the output signal of the second sensor 11 has malfunctioned.

  The rise of the output signal of the second sensor 11 is used as an event for transitioning the second internal state from OFF to ON, but when the output signal of the second sensor 11 does not rise to ON (time in FIG. 5). T6) Even if the output signal of the first sensor 10 falls (time T7 in FIG. 5), the second internal state has not changed from ON to ON and remains OFF, and the second internal state has changed from ON. Since it cannot transition to OFF, it can be determined that the second sensor 11 has malfunctioned.

  FIG. 6 is a diagram illustrating a case where the output signal of the first sensor 10 does not fall off. When the output signal of the first sensor 10 does not fall off, it can be determined from the first internal state that the first sensor 10 has malfunctioned.

  The rise of the output signal of the first sensor 10 is used as an event for transitioning the first internal state from ON to OFF, but the output signal of the first sensor 10 does not fall to OFF (Time T8 in FIG. 6), the first internal state does not transition to ON but remains OFF, and even if the output signal of the second sensor 11 rises, the first internal state transitions from ON to OFF. Since this is not possible (time T9 in FIG. 6), it can be determined that the first sensor 10 has malfunctioned.

  FIG. 7 is a diagram illustrating a case where the output signal of the second sensor 11 does not fall off. When the output signal of the second sensor 11 does not fall off, it can be determined from the second internal state that the second sensor 11 has malfunctioned.

  The rise of the output signal of the second sensor 11 is used as an event for changing the state of the first internal state from ON to OFF and changing the state of the second internal state from OFF to ON. 11 does not fall OFF (time T10 in FIG. 7), the second internal state does not transition to ON and remains OFF, and the output signal of the first sensor 10 falls. However, since the second internal state cannot be changed from ON to OFF (time T11 in FIG. 7), it can be determined that the second sensor 11 has malfunctioned.

  In this way, the first sensor 10 and the second sensor 11 are made to transition between the first internal state and the second internal state in accordance with the output signals of the first sensor 10 and the second sensor 11. However, since it cannot be determined that both the first sensor 10 and the second sensor 11 have malfunctioned, the PLC 12 of the present embodiment uses a timer, A ladder that determines that both the first sensor 10 and the second sensor 11 have malfunctioned is incorporated.

  FIG. 8 is a diagram illustrating a case where the output signals of both the first sensor 10 and the second sensor 11 do not rise to ON. When the output signals of both the first sensor 10 and the second sensor 11 do not rise to ON, the output signals of both the first sensor 10 and the second sensor 11 as well as the first internal state and the second internal Since there are many cases where the state remains OFF (section K1 in FIG. 8), a timer that starts when the output signals of both the first sensor 10 and the second sensor 11 are not input is provided on the ladder. When the predetermined time is measured, it is determined that both the first sensor 10 and the second sensor 11 have malfunctioned.

  FIG. 9 is a diagram for explaining a case where the output signals of both the first sensor 10 and the second sensor 11 do not fall off and cannot be cut off. If both the first sensor 10 and the second sensor 11 do not fall off, the time when the output signals of both the first sensor 10 and the second sensor 11 are on is normal than when the time is normal. Since it becomes longer (section K2 in FIG. 9), a timer is provided on the ladder that starts when the output signals of both the first sensor 10 and the second sensor 11 are ON. When the timer measures a predetermined time, It is determined that both the first sensor 10 and the second sensor 11 have malfunctioned.

  Note that when the malfunction of both the first sensor 10 and the second sensor 11 is determined using a timer, the predetermined time used for determining the malfunction may be a static value, but the separation paper 3a Even when the transport speed or the size of the label 3 is changed, it is desirable to be able to automatically calculate a predetermined time used for determination of malfunction.

  For example, in the case where the output signals of both the first sensor 10 and the second sensor 11 are not input, the normal time when the output signals of both the first sensor 10 and the second sensor 11 are not input is determined. A value obtained by measuring a plurality of times and multiplying the average value of this time by one or more coefficient (for example, “2”) may be used as a predetermined time used for determining malfunction.

  So far, the contents of determining the malfunction of the first sensor 10 and the second sensor 11 have been described, but chattering in which the output signal of the sensor instantaneously switches to ON-OFF due to flapping of the separate paper 3a frequently occurs. Therefore, if the chattering is determined to be a malfunction of the sensor, the efficiency of the number inspection of the label 3 is extremely reduced. Therefore, the PLC 12 of this embodiment includes a ladder that cancels the chattering using a timer.

  FIG. 10 is a diagram for explaining a state when chattering occurs in the output signal of the first sensor 10. When chattering occurs in the output signal of the first sensor 10, the output signal of the first sensor 10 instantaneously switches to ON-OFF (section K3 in FIG. 10), so the output signal of the first sensor 10 is ON. A timer for measuring the time since the first time is provided, and when the timer measures a predetermined time, it is determined that the output signal of the first sensor 10 has risen. If it is longer than (section K4 in FIG. 10), chattering that occurs in the output signal of the first sensor 10 can be canceled. Note that chattering that occurs in the output signal of the second sensor 11 can also be canceled for the second sensor 11 by the method described above.

  Note that when chattering is canceled using a timer, the predetermined time used for chattering cancellation may be a static value, but this is a case where the transport speed of the separate paper 3a and the size of the label 3 are changed. However, it is desirable that the predetermined time used for canceling chattering can be automatically calculated.

  For example, when chattering generated in the output signal of the first sensor 10 is canceled, the normal time when the output signal of the first sensor 10 is turned on is measured a plurality of times, and the average value of this time is less than 1 A value obtained by multiplying the coefficient (for example, “0.5”) may be used as a predetermined time used for canceling chattering.

  As described above, the first internal state and the second internal state held by the PLC 12 are not only used for determining the malfunction of the first sensor 10 and the second sensor 11 but also for counting the number of labels 3. Can also be used.

  As described above, when a behavior other than the signal pattern in which the output signal of the second sensor 11 rises to ON while the output signal of the first sensor 10 is ON, the first sensor 10 and the second sensor 10 In order to determine that one or both of the sensors 11 malfunctions, the PLC 12 generates a signal pattern in which the output signal of the second sensor 11 rises to ON while the output signal of the first sensor 10 is ON. At this time, the counter used for counting the number of labels 3 is incremented, the counter value after the increment is displayed on the display 13, and the time value at this time and a code indicating normality are given to the counter value after the increment. Is stored, and the number inspection process for label 3 continues.

  Even when it is determined that one of the first sensor 10 and the second sensor 11 has malfunctioned, it is considered that at least one sensor has detected the label 3 normally. When it is determined that any one of the second sensors 11 has malfunctioned, the counter is incremented, and then the counter value after the increment is displayed on the display 13 and corresponds to the date and time at this time and the sensor determined to malfunction. A code is assigned to store the incremented counter value, and the label 3 count inspection process continues.

  When it is determined that both the first sensor 10 and the second sensor 11 have malfunctioned, the label 3 count inspection process is interrupted because it is considered that the label 3 is abnormal for any reason.

  The data related to the counter value stored in the PLC 12 is changed to the counter value stored in the PLC 12 when a predetermined operation (for example, an operation for initializing the counter value) is performed on the PLC 12. The related data is transmitted to the server 2 and stored in the server 2.

  Finally, the use of the third sensor 14 provided in the label number inspection apparatus 1 of the present embodiment will be described. The third sensor 14, which is an optical sensor for detecting a defective mark printed on the label 3, is also realized by using a light projecting / receiving optical sensor, and the defective label 3 is mixed into the winding. In order to prevent this, the label number inspection device 1 is provided.

  The defect detection sensor is arranged upstream of the first sensor 10 so that the output signal of the third sensor 14 changes from OFF to ON when a defect mark indicating a defective product is detected. After the adjustment, the PLC 12 incorporates a ladder that stops the conveyance of the separate paper 3a when the output signal of the third sensor 14 changes from OFF to ON.

DESCRIPTION OF SYMBOLS 1 Label number inspection apparatus 10 1st sensor 11 2nd sensor 12 PLC
13 Display 14 Third sensor 2 Server 3 Label 3a Separate paper

Claims (10)

  A first sensor and a second sensor, which are arranged with an interval shorter than the length of the label in the flow direction and spaced in the flow direction, and the output signal when the label is detected, and the paper on which the label is stacked, The output signals of the first sensor and the second sensor during monitoring are monitored, and the output signal of the first sensor arranged on the upstream side is ON while the output signal of the first sensor arranged on the downstream side is ON. When a behavior other than the signal pattern in which the output signal of the sensor No. 2 rises to ON occurs, a number inspection unit is provided that determines that one or both of the first sensor and the second sensor malfunctions. Label quantity inspection device.   The number inspection means is set to the first state in which the state transition is set to transition to ON when the output signal of the first sensor rises to ON and transition to OFF when the output signal of the second sensor rises to ON. And the second state in which the state transition is set to transition to ON when the output signal of the second sensor rises to ON and transition to OFF when the output signal of the first sensor falls to OFF. Holding the state transition of the internal state of the first and second transitions of the first internal state and the second internal state according to the respective state transitions based on changes in the signals of the first sensor and the second sensor, If the first internal state cannot transition according to the state transition of the first internal state, it is determined that the first sensor has malfunctioned, and the second internal state follows the state transition of the second internal state. transition If you can not, and judging said second sensor malfunctions, the label membered inspection apparatus according to claim 1.   The number inspection means measures the time when the output signals of the first sensor and the second sensor are both OFF, and when the time reaches a first predetermined time, The label number inspection apparatus according to claim 2, wherein both the sensor and the second sensor are determined to malfunction.   The number inspection means measures a predetermined number of times when the output signals of the first sensor and the second sensor are both OFF, and multiplies the average value of the measured times by a coefficient of 1 or more. 4. The label number inspection apparatus according to claim 3, wherein a value is used as the first predetermined time.   The number inspection means measures the time when the output signals of the first sensor and the second sensor are both ON, and when the time reaches a second predetermined time, The label number inspection apparatus according to claim 2, wherein both the sensor and the second sensor are determined to malfunction.   The number inspection means measures a predetermined number of times when the output signals of the first sensor and the second sensor are both ON, and multiplies the average value of the measured times by a coefficient of 1 or more. 6. The label number inspection apparatus according to claim 5, wherein a value is used as the second predetermined time.   The number inspection means increments a counter used for the number inspection of the label when the first internal state falls to OFF, and then assigns a code indicating normality to obtain the value of the counter after the increment. Save the value of the counter after incrementing by adding a code corresponding to the determined malfunction after incrementing the counter when it is determined that either the first sensor or the second sensor malfunctioned The label number inspection device according to claim 2, wherein the label number inspection device is stored.   The number inspection means measures the time from when the output signal is turned ON for each output signal of the first sensor and the second sensor, and outputs the output when the time reaches a third predetermined time. The label number inspection apparatus according to any one of claims 2 to 7, wherein it is determined that the signal has risen to ON.   For each output signal of the first sensor and the second sensor, the number inspection means measures the time from when the output signal is turned on a predetermined number of times, and a coefficient less than 1 in the average value of the measured time 9. The label number inspection apparatus according to claim 8, wherein a value obtained by multiplying is used as the third predetermined time. A third sensor for detecting a defective mark printed on the label is disposed upstream of the first sensor in the flow direction of the separate paper, and the number of units when the third sensor detects the defective mark. 10. The label number inspection apparatus according to claim 1, wherein the inspection process is interrupted.

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