JP2007204173A - Superposition detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superposition detection device capable of detecting trouble of paper feeding by determining whether or not paper sheets are conveyed in such a state that they are deviated and superposed relative to a paper sheet on an upstream side in a conveying direction by a predetermined amount in the conveying direction. <P>SOLUTION: The superposition detection device 2 provided on a printer 1 is provided with a papers detection sensor 9 for detecting whether or not the paper P passing through a predetermined position is one sheet, and is provided with a signal output part for outputting a superposition signal based on a detection result of the paper detection sensor 9. The superposition signal is a signal becoming the first state in a section where the paper sheets P are superposed and becoming the second state in a section where the paper sheets P are not superposed. The device is provided with a determination part 11 for determining that the paper sheets P are normally conveyed in such a state that they are deviated and superposed relative to the paper sheet P on an upstream side in the conveying direction by a predetermined amount in the conveying direction when the section of the first state of the superposition signal is equal to a predetermined reference section, and for determining that they are not conveyed in the normal state when the section is different from the predetermined reference section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a superimposition detection apparatus that can detect whether or not a single sheet is conveyed.

  Conventionally, a conveyance unit that continuously conveys sheets with a predetermined amount shifted in the conveyance direction with respect to a sheet upstream of the conveyance direction, and a sheet is supplied one by one from the conveyance unit. As a superposition detection device provided in a printing press provided with a printing unit that prints, a sheet detection sensor that detects whether or not a sheet to be conveyed is one sheet when passing a predetermined position; Based on the detection result, a superposition signal that is in a first state (for example, the H state) when the sheets are overlapped and is in a second state (for example, the L state) if the sheets are not overlapped is determined. A signal output unit that outputs every cycle, and when the superimposition signal is in the second state, the sheet is transported normally with a predetermined amount shifted in the transport direction with respect to the upstream sheet in the transport direction. If the superimposed signal is in the first state, it is carried in a normal state. Is known which comprises a a determination unit is not (see Patent Document 1).

  In such a superposition detection device, when the sheet to be conveyed passes through a predetermined position, the sheet detection sensor detects whether or not there is one sheet. Based on the detection result of the sheet detection sensor, the signal output unit outputs the superimposed signal at predetermined intervals.

  Here, for example, the superimposition signal is output at a predetermined cycle such as every timing when one sheet passes through a predetermined position. When the sheets are overlapped, the superposition signal is in the first state and overlapped. If not, the signal is in the second state.

  The output superimposed signal is input to the determination unit, and the determination unit determines that it is normally conveyed when in the second state, and conveys it in the normal state when it is in the first state. It is determined that it has not been done.

  As described above, the conventional superimposition detection device outputs a superimposition signal at each cycle in accordance with a predetermined cycle such as a timing when the sheet passing through a predetermined position is in a single sheet state, and the superimposition signal However, it is determined that the sheet is not conveyed in a normal state when it is the first state indicating that the sheets are overlapping. Thereby, a paper feeding trouble such as a case where a plurality of sheets are overlapped at a time from the transport unit to the printing unit is detected.

By the way, as a cause of paper feeding troubles in such a printing press, a plurality of sheets passing through a predetermined position as described above are transported in a state where a plurality of sheets are overlapped at a timing that should be one sheet. In addition to the above, there may be a case where the amount of deviation with respect to the sheet on the upstream side in the transport direction is larger or smaller than a predetermined amount. In such a case, a paper feeding problem may occur such that a plurality of sheets are supplied to the printing unit at a time, or sheets are not supplied to the printing unit.
JP-A-11-180595

  However, in the above conventional superimposition detection device, the superimposition signal is output only at the timing when the sheet passing through the predetermined position is in a single sheet state as described above. Therefore, even when the sheet is transported in a state where the sheet is transported in a state of being larger than or smaller than a predetermined amount with respect to the upstream sheet in the transport direction, the sheet is In the case of one sheet, the superimposed signal to be output is in the second state (for example, L state). If it does so, there exists a possibility that it may determine with the determination part being conveyed normally although it is not conveyed in a normal state.

  Accordingly, the present invention has been made in view of the above-described conventional problems, and determines whether or not a sheet is conveyed in a state where it is deviated by a predetermined amount in the conveyance direction and overlapped with a sheet upstream of the conveyance direction. It is an object of the present invention to provide a superposition detection device that can detect a paper feed trouble.

  The present invention has been made to solve the above-described problems, and the superposition detection device according to the present invention is a state in which the sheets overlap each other by a predetermined amount in the transport direction with respect to the upstream sheet in the transport direction. Is a superposition detection device provided in a printing machine that is continuously transported with a sheet detection sensor that detects whether or not only one sheet passes through a predetermined position. A signal output unit that outputs a superimposition signal based on the detection result of the sensor is provided, and the superimposition signal is in a first state in a section where sheets are overlapped and is in a second state in a section where sheets are not overlapped. If the first state section of the superimposed signal is equal to the predetermined reference section, the sheet is normal with the sheet being shifted by a predetermined amount in the transport direction with respect to the upstream sheet in the transport direction. If it is different from the predetermined reference section Characterized in that it comprises a determination unit not to be transported in a normal state.

  In the superposition detection apparatus having the above configuration, when a sheet continuously conveyed in a state of being deviated by a predetermined amount in the conveyance direction and overlapping a sheet upstream of the conveyance direction passes through a predetermined position, The sheet detection sensor detects whether or not there is one sheet. Based on the detection result of the sheet detection sensor, the signal output unit is in the first state (for example, H state) in the section where the sheets are overlapped, and is second in the section where the sheets are not overlapped. A superimposed signal that is in a state (for example, L state) is output. Then, the superimposed signal output from the signal output unit is input to the determination unit.

  Here, the determination unit compares the first state section of the superimposed signal with a predetermined reference section, and if both sections are equal, the sheet is transported in the transport direction with respect to the upstream sheet in the transport direction. It is determined that the sheet is normally transported in a state where it is shifted by a predetermined amount, and if it is different, it is determined that the sheet is not transported in the normal state.

  In addition, the superimposition detection device according to the present invention is a superposition detection provided in a printing machine that is continuously transported in a state in which the sheet is overlapped with a certain amount of shift in the transport direction with respect to the upstream sheet in the transport direction. An apparatus comprising a sheet detection sensor that detects whether or not only one sheet passes through a predetermined position, and outputs a superimposed signal based on a detection result of the sheet detection sensor The superimposed signal is a signal that is in the first state in the section where the sheets are overlapped and is in the second state in the section where the sheets are not overlapped, and is a superimposed signal with respect to the printing reference of the printing press. When the switching timing between the first state and the second state is equal to a predetermined reference timing, the sheet is normal in a state where it overlaps the sheet in the transport direction by a predetermined amount with respect to the upstream sheet in the transport direction. It is determined that the Characterized in that it comprises a determination unit not to be transported in a normal state if the grayed different.

  In the superposition detection apparatus having the above configuration, when a sheet continuously conveyed in a state of being deviated by a predetermined amount in the conveyance direction and overlapping a sheet upstream of the conveyance direction passes through a predetermined position, The sheet detection sensor detects whether or not there is one sheet. Based on the detection result of the sheet detection sensor, the signal output unit is in the first state (for example, H state) in the section where the sheets are overlapped, and is second in the section where the sheets are not overlapped. A superimposed signal that is in a state (for example, L state) is output. Then, the superimposed signal output from the signal output unit is input to the determination unit.

  Here, the determination unit compares a timing at which the first state and the second state of the superimposed signal with respect to the printing reference of the printing machine are switched with a predetermined reference timing, and if both timings are equal, the sheet is conveyed. It is determined that the sheet is transported normally in a state where it is deviated by a predetermined amount in the transport direction with respect to the sheet on the upstream side in the transport direction, and it is determined that the sheet is not transported in the normal state if different.

  Thus, in the superimposition detection device according to claim 1 of the present invention, the first state in the section where the sheets are overlapped based on the detection result of whether or not the sheets are one sheet. In a section where the sheets do not overlap, a superposition signal that is in the second state is output. Then, by comparing the section in the first state of the output superimposed signal with a predetermined reference section, the transported sheet is shifted by a predetermined amount in the transport direction with respect to the upstream sheet in the transport direction. It is possible to determine whether or not the sheets are conveyed in an overlapped state, and it is possible to detect a paper feed trouble.

  Further, in the superposition detection device according to claim 2 of the present invention, the sheet is in the first state in the section where the sheets are overlapped based on the detection result of whether or not the sheets are one sheet. In a section in which the leaf sheets do not overlap, a superposition signal that is in the second state is output. Then, by comparing the timing at which the first state and the second state of the superimposed signal with respect to the printing reference of the printing machine are switched with a predetermined reference timing, the sheet to be conveyed is changed to the sheet on the upstream side in the conveying direction. On the other hand, it is possible to determine whether or not the sheets are transported in a state where they are shifted by a predetermined amount in the transport direction, and it is possible to detect a paper feed trouble.

Hereinafter, an embodiment (first embodiment) of a superposition detection apparatus according to the present invention will be described with reference to the drawings.
FIG. 1 shows a printing press 1 provided with a superposition detection device 2 in the present embodiment. The printing machine 1 includes a printing unit 3 that performs printing, and a transport unit 4 that transports sheets to the printing unit 3 one by one. The transport unit 4 has a feeder board 5 that transports the sheets P sequentially sent out from a lifting table (not shown) to the downstream side, and the leading end of the sheet P transported by the feeder board 5 comes into contact with the sheet P. And a swing claw 8 for picking up the leading end of the sheet P with the adjusted posture and feeding the sheet P to the sheet feed cylinder 7 of the printing unit 3.

  In a normal state, the sheet P sent out from the lifting table is continuously conveyed on the feeder board 5 in a state where it is deviated by a predetermined amount and overlapped with the sheet P on the upstream side in the conveying direction. In other words, in a normal transport state, the preceding sheet P is transported in a state where it overlaps the succeeding sheet P by a predetermined amount in the transport direction. Here, the predetermined amount is called a stream pitch, and indicates a distance between the leading edge of the preceding sheet P and the leading edge of the succeeding sheet P, and can be set to, for example, about 180 mm. .

  Then, the preceding sheet P is brought into contact with the front pad 6 so that the posture is adjusted, the leading end is picked by the swing claw 8, and is drawn out to the downstream side faster than the conveying speed. Supplied one by one.

  The superposition detection device 2 provided in the printing machine 1 includes a sheet detection sensor 9 that detects whether or not there is one sheet P that passes through a predetermined position, and detection by the sheet detection sensor 9. Based on the result, the amplifier 10 as a signal output unit that outputs a superimposition signal is compared with the superimposition signal and a predetermined reference section. In a predetermined case, the sheet P is changed to the sheet P upstream in the transport direction. On the other hand, it includes a determination unit 11 that determines that the sheet is normally transported in a state where it is shifted by a predetermined amount in the transport direction and is not transported in a normal state otherwise.

  A pair of sheet detection sensors 9 is provided between the feeder board 5 and the front pad 6 so that the sheet P in the middle of conveyance passes through the pair of sheets. The sheet detection sensor 9 irradiates the sheet P with light and detects the overlapping state of the sheets P based on the difference in transmitted light. Such as an ultrasonic sensor that detects the overlapping state of sheets P by irradiation and the presence or absence of an air layer (if two or more sheets P overlap, an air layer is generated between the sheets P). A known sensor can be employed.

  Here, as described above, in the normal conveyance state, the preceding sheet P is continuously conveyed in a state where it is deviated by a predetermined amount and overlapped with the subsequent sheet P. It passes continuously between the sheet detection sensors 9 without interruption. That is, when the sheets P are conveyed in a normal overlapping state, between the upper and lower sheet detection sensors 9, there are a state where the sheets P are overlapped and a state where they are one sheet. Pass alternately with a certain period. Therefore, the detection result in the normal conveyance state is a result in which a section indicating that two sheets P are overlapped and a section indicating that the sheets P are alternately appear alternately at a constant period.

  Here, the case where the sheets P are conveyed in a normal overlapping state will be further described. When the sheet P is conveyed on the feeder board 5, the leading end of the leading sheet P passes between the sheet detecting sensors 9 and contacts the front pad 6. The movement of P in the transport direction stops. At this time, there is one sheet between the sheet detection sensors 9. Here, the posture of the leading sheet P is adjusted by the front pad 6.

  Thereafter, the leading edge of the leading sheet P is gripped by the gripper 81 of the swing claw 8, but the leading edge of the leading sheet P is stopped after the feeding of the leading sheet P in the conveying direction is stopped. The subsequent sheet P continues to be conveyed by the feeder board 5 until the sheet is fed by the gripper 81, and the leading end of the second sheet P is the sheet detection sensor 9. Pass between. From this time, there are two sheets between the sheet detection sensors 9. That is, after the leading edge of the second sheet P reaches between the upper and lower sheet detection sensors 9, the rear end of the first sheet P is the upper and lower sheet detection sensors 9. Until it passes, the sheet P is in a state of two sheets between the upper and lower sheet detection sensors 9.

  Thereafter, the leading edge of the leading sheet P is held by the gripper 81, pulled out at a speed higher than the transport speed, and sent to the paper feed cylinder 7. At this time, when the rear end portion of the leading sheet P passes between the sheet detection sensors 9, at that time, the two sheets end between the sheet detection sensors 9, and one sheet again. It becomes the state of.

  Thereafter, the second sheet P becomes the first sheet P described above, and is sequentially conveyed and fed in the above-described procedure.

  As described above, when the sheets P are conveyed in a normal overlapping state, the preceding sheet P overlaps with a subsequent sheet P by a predetermined amount (for example, a stream pitch). Therefore, between the sheet detection sensors 9, one state and two states appear alternately at a constant cycle. That is, the time length when the sheet detection sensor 9 detects that the sheet P is in the state of one sheet and the time length when it is detected as the state of two sheets are respectively constant lengths. It becomes. Accordingly, the detection result in the normal conveyance state is that a section (width) indicating that a plurality of sheets P overlap each other and a section (width) indicating that the sheets are one sheet are alternately arranged at a constant cycle. The result will appear.

  The amplifier 10 outputs a superimposed signal based on the detection result of the sheet detection sensor 9. This superposition signal is a signal that is in the first state (H state) in the section where the sheets P overlap, and is in the second state (L state) in the section where the sheets P do not overlap. Specifically, the superimposition signal is in the first state in a section indicating that a plurality of sheets P as a detection result of the sheet detection sensor 9 are overlapped, and is second in a section indicating one sheet. It is a signal that becomes a state.

  Here, the detection result in the normal conveyance state is a result in which a section indicating that two sheets P overlap each other and a section indicating one sheet of paper P appear alternately at a constant cycle. The superimposed signal output at 10 is a signal having a waveform in which the first state and the second state are alternately continued at a constant period. That is, the superimposed signal in the case of the normal conveyance state results in that the first state section (width) and the second state section (width) appear alternately at a constant period. In the present embodiment, the amplifier 10 constitutes a CPU together with a determination unit 11 and a storage unit 12 which will be described later. However, the amplifier 10 is externally connected or incorporated in the sheet detection sensor 9. It may be.

  When the section of the first state of the superimposed signal transmitted from the amplifier 10 is equal to the predetermined reference section, the determination unit 11 moves the sheet P in the transport direction with respect to the sheet P upstream in the transport direction. It is determined that the sheet is normally transported in a state where it is deviated by a predetermined amount, and when it is different from the predetermined reference section, it is determined that the sheet is not transported in a normal state.

  Here, the predetermined reference section indicates the overlapping state of the sheets P when the sheets P are normally conveyed, and the number of superimposed signals when the sheets P are conveyed in a normal overlapping state. A section in one state or a section in the second state. Specifically, the predetermined reference section refers to the sheet P to be transported in a state where it is deviated by a predetermined amount (stream pitch) and overlapped with the sheet P upstream in the transport direction. When the sheet detection sensor 9 passes the sheet detection sensor 9), it is detected that the sheet detection sensor 9 detects that the sheet P is one sheet or that two sheets overlap each other. It can be a length of time. Alternatively, the amount of deviation of the sheet P from the sheet P on the upstream side in the transport direction, that is, the stream pitch can be used. The predetermined reference section is stored in the storage unit 12 constituting the CPU by, for example, an operator input or by storing the section when the first and second sheets pass as a reference.

  Further, “not being transported in a normal state” means that the preceding sheet P is transported in a state where it does not deviate from the succeeding sheet P by a predetermined amount. It means a state in which the sheets are transported while being shifted more or less.

  In addition, the superposition detection device 2 receives a stop signal from the determination unit 11 and stops the feeder board 5 when the determination unit 11 determines that the conveyance state is not normal, and the determination unit 11 And a notification lamp that lights or flashes in response to a notification signal from the determination unit 11 when it is determined that the conveyance state is not normal. As the notification lamp, for example, an LED or the like can be used, and the notification lamp may be configured to notify when the color changes other than lighting and blinking.

Next, a control method of the superposition detection device 2 in the present embodiment will be described with reference to the flowchart shown in FIG.
First, the printing machine 1 is activated to print the sheet P. Then, each part such as the swing claw 8 is operated so as to synchronize with the rotation of the paper feed cylinder 7, and the sheet P is sent out from the lifting table and conveyed by the feeder board 5. When the sheet P is conveyed on the feeder board 5, the sheet detection sensor 9 overlaps whether or not there is one sheet P passing between the upper and lower sheet detection sensors 9. And the detection result is transmitted to the amplifier 10 (step S1).

  The amplifier 10 that has received the detection result is in the first state (H state) in the section where the sheets P overlap, and in the second state (L in the section where the sheets P do not overlap, based on the detection result. State) is output and transmitted to the determination unit 11 (step S2).

  The determination unit 11 that has received the superposition signal receives a plurality of sheet P that passes between the upper and lower sheet detection sensors 9 in a normal overlapping state (in this embodiment, the normal section is stored in the storage unit 12). Read the length of time that is detected as overlapping, that is, the length of the first state section of the superimposed signal in a normal transport state, and compare the first state section of the superimposed signal with the reference section (Step S3). As a reference section, the length of time that is detected as one sheet P passing between the upper and lower sheet detection sensors 9 in a normal overlapping state, that is, in a normal conveyance state When the length of the second state section of the superimposed signal is employed, the determination unit 11 compares the second state section of the superimposed signal with the reference section.

  Here, when both sections are equal, the determination unit 11 determines that the transport is performed in a normal state, and subsequently compares the section in the first state of the superimposed signal with the reference section. On the other hand, when both sections are different, it is determined that the sheet is not conveyed in a normal state (step S4).

  When it is determined that it is not transported in a normal state (when the section of the first state of the superimposition signal is longer or shorter than the reference section), the determination unit 11 receives the stop signal and the notification signal. (Step S5, Step S6), the feeder stop solenoid SOL that has received the stop signal stops the feeder board 5 to stop the conveyance of the sheet P (Step S7), and the notification lamp that has received the notification signal Lights up or blinks to inform the operator (step S8).

  In this way, the determination unit 11 determines whether or not the conveyed sheet P is being conveyed in a normal overlapping state by comparing the section in the first state of the superimposed signal with the reference period. As a result, paper feed trouble can be detected.

  Subsequently, another embodiment (second embodiment) of the superposition detection device 2 according to the present invention will be described. In addition, in this embodiment, the same code | symbol is attached | subjected about the structure similar to 1st embodiment, and description is abbreviate | omitted. The superposition detection apparatus 2 according to the present embodiment includes a sheet detection sensor 9, an amplifier 10, a determination unit 11, a storage unit 12 in which reference timing is stored, a feeder stop solenoid SOL, and a notification lamp, and further includes printing. An encoder 13 that outputs a rotation signal as a printing reference of the machine 1 is provided.

  The encoder 13 outputs a rotation signal as a printing reference for the printing press 1. Specifically, the encoder 13 outputs a rotation signal based on the rotation of the paper feed cylinder 7. For example, the encoder 13 outputs a signal that is in the H state every time the sheet feed cylinder 7 becomes 0 degrees. That is, the rotation signal is a signal that is in the H state at regular intervals based on the detection result of the rotation angle of the paper feed cylinder 7.

  When the timing at which the first state and the second state of the superimposed signal are switched with respect to the printing reference of the printing press 1 is equal to the predetermined reference timing, the determination unit 11 determines that the sheet P is the upstream sheet in the transport direction. It is determined that the sheet P is normally conveyed in a state where it is deviated by a predetermined amount in the conveyance direction and overlapped with the sheet P, and it is determined that the sheet P is not conveyed in a normal state when different from a predetermined reference timing.

  Here, the timing of switching between the first state and the second state refers to the time when the first state and the second state of the superimposed signal are switched with respect to the reference with reference to the rotation of the paper feed cylinder 7. Specifically, when the H state of the rotation signal from the encoder 13 is used as a reference, the superimposed signal is switched from the first state to the second state, or the second state is switched to the first state.

  On the other hand, as described above, when the sheets P are conveyed in a normal overlapping state, the preceding sheet P is shifted from the succeeding sheet P by a predetermined amount (for example, the stream pitch). Therefore, between the sheet detection sensors 9, one state and two states appear alternately at a constant cycle. Moreover, in general, the operation of the swing claw 8 is synchronized with the rotation of the paper feed cylinder 7, so that the sheets P are fed one by one in synchronization with the rotation of the paper feed cylinder 7. Therefore, when the sheets P are conveyed in a normal overlapping state, the timing at which the sheet P passing between the sheet detection sensors 9 switches from one to two, or The timing of switching from the two-sheet state to the one-sheet state is switched in synchronization with the rotation of the sheet feed cylinder 7.

  Here, the predetermined reference timing refers to the first state and the second state of the superimposed signal with respect to the reference with respect to the rotation of the sheet feeding cylinder 7 in the case of being conveyed in such a normal overlapping state. The time when the state changes. Specifically, when the predetermined reference timing is conveyed in a normal overlapping state, the superimposed signal is changed from the first state to the second state when the H state of the rotation signal from the encoder 13 is used as a reference. When switching, or when switching from the second state to the first state. Incidentally, the predetermined reference timing is stored in the storage unit 12 by, for example, an operator input or by storing the timing when the first and second sheets pass as a reference.

Next, the control method of the superposition detection apparatus 2 in this embodiment will be described with reference to the flowchart shown in FIG.
First, when the printing press 1 is operated to print the sheet P, the paper feed cylinder 7 rotates, and the respective parts such as the swing claw 8 and the feeder board 5 operate in synchronization with the rotation period. . For example, each part operates in synchronization with the rotation of the paper feed cylinder 7 so that one sheet of paper P is fed while the paper feed cylinder 7 rotates once. Thus, the sheet P is transported on the feeder board 5 in a state where the respective parts are operated in synchronization with the rotation of the paper feed cylinder 7. Then, the sheet detection sensor 9 detects an overlapping state as to whether or not there is one sheet P passing between the upper and lower sheet detection sensors 9 and transmits the detection result to the amplifier 10. (Step S11).

  The amplifier 10 that has received the detection result is in the first state (H state) in the section where the sheets P overlap, and in the second state (L in the section where the sheets P do not overlap, based on the detection result. State) is output and transmitted to the determination unit 11 (step S12).

  On the other hand, the encoder 13 transmits a rotation signal based on the rotation reference of the paper feed cylinder 7 to the determination unit 11 (step S12).

  The determination unit 11 that has received the superimposed signal transmitted from the amplifier 10 and the rotation signal transmitted from the encoder 13 measures the timing at which the first state and the second state of the superimposed signal with respect to the rotation signal are switched (step S13). . Then, the reference timing stored in the storage unit 12 (in this embodiment, the timing at which the first state and the second state of the superimposed signal with respect to the rotation signal in the normal conveyance state are switched) is read, and the measured timing and the reference timing Are compared (step S14). In addition, when the timing at which the second state and the first state of the superimposed signal with respect to the rotation signal in the normal conveyance state are switched as the reference timing is adopted, the determination unit 11 determines the second of the superimposed signal with respect to the rotation signal. The timing at which the state and the first state are switched is measured and compared with the reference timing.

  Here, when both timings are equal, the determination unit 11 determines that the sheet is being conveyed in a normal state, and compares the measured timing with the reference timing. On the other hand, when both timings are different, it is determined that the sheet is not conveyed in a normal state (step S15).

  When it is determined that the sheet is not conveyed in a normal state (when the measured timing is earlier or later than the reference timing), the determination unit 11 outputs a stop signal and a notification signal (step In step S16, step S17), the feeder stop solenoid SOL that has received the stop signal stops the feeder board 5 and stops the conveyance of the sheet P (step S18), and the notification lamp that has received the notification signal lights up or flashes. Inform the operator (step S19).

  In this way, the sheet P to be conveyed is conveyed in a normal overlapping state by comparing the reference timing with the timing at which the first state and the second state of the superimposed signal with respect to the rotation reference of the sheet feeding cylinder 7 are switched. It is possible to determine whether or not a paper feed has occurred, and as a result, a paper feed trouble can be detected.

  In the first embodiment and the second embodiment, the amplifier 10 as the signal output unit is configured to output a superimposed signal that is in two states of a first state (H state) and a second state (L state). However, the present invention is not limited to this, and it may be configured to output superimposed signals in three states. Specifically, when the number of sheets P passing between the upper and lower sheet detection sensors 9 is zero, the reference state (M state) is obtained, and when a plurality of sheets P overlap each other. Is in the first state (H state), and when the number of sheets P is one, the amplifier 10 can be configured to output a superimposed signal that is in the second state (L state). As a result, it is possible to detect a state in which the number of sheets P passing between the upper and lower sheet detection sensors 9 is zero, and it is possible to quickly find out the content of the paper feeding trouble.

1 is a partial schematic diagram illustrating a printing press including a superposition detection device according to a first embodiment of the present invention. The flowchart which shows the control method of the superimposition detection apparatus in 1st embodiment. The partial schematic diagram which shows the printing machine provided with the superimposition detection apparatus which concerns on 2nd embodiment of this invention. The flowchart which shows the control method of the superimposition detection apparatus in 2nd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Printing machine, 2 ... Overlay detection apparatus, 5 ... Feeder board, 7 ... Feeding cylinder, 8 ... Swing nail, 9 ... Sheet paper detection sensor, 10 ... Amplifier, 11 ... Determination part, 12 ... Memory | storage part, 13 ... Encoder, P ... sheet

Claims (2)

  A superposition detection device provided in a printing machine that is continuously transported in a state where a sheet is overlapped by a predetermined amount in the transport direction with respect to a sheet upstream of the transport direction, the sheet passing through a predetermined position A sheet detection sensor that detects whether or not the number of sheets is one, and a signal output unit that outputs a superimposed signal based on a detection result of the sheet detection sensor; Is a signal that is in the first state in the section where the sheets overlap and is in the second state in the section where the sheets do not overlap, and if the section in the first state of the superimposed signal is equal to the predetermined reference section, the sheet It is determined that the paper is normally transported in a state where it is shifted by a predetermined amount in the transport direction with respect to the upstream sheet in the transport direction, and is transported in a normal state when different from a predetermined reference section. A superimposition detection device comprising a determination unit that determines that there is no overlap .   A superposition detection device provided in a printing machine that is continuously transported in a state where a sheet is overlapped by a predetermined amount in the transport direction with respect to a sheet upstream of the transport direction, the sheet passing through a predetermined position A sheet detection sensor that detects whether or not the number of sheets is one, and a signal output unit that outputs a superimposed signal based on a detection result of the sheet detection sensor; The signal is in the first state in the section where the sheets overlap and is in the second state in the section where the sheets do not overlap, and the first state and the second state of the superimposed signal are switched with respect to the printing reference of the printing press. When the timing is equal to the predetermined reference timing, it is determined that the sheet is normally conveyed in a state where the sheet is shifted by a predetermined amount in the conveyance direction with respect to the upstream sheet in the conveyance direction. If it is different from the reference timing, Superimposing detecting apparatus comprising: a determination unit not to be.

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