Patent Publication Number: US-2022234854-A1

Title: Conveyance control device and conveyance control method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2021-008830 filed in Japan on Jan. 22, 2021, the contents of which are incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a paper conveyance device for conveying paper ejected from an upstream paper processing device to a downstream paper processing device, and particularly relates to a conveyance control device and conveyance control method for controlling conveyance timing of paper. 
     2. Description of Related Art 
     Conventionally, a paper conveyance device is known for piling up one group of paper ejected from a printer and conveying the piled up paper bundle. For example, JP 2001-019261 A discloses a paper conveyance device provided with a paper piling unit for temporarily piling up paper ejected from a printer, wherein when paper sheets piled up in the paper piling unit reach a predetermined number to form a paper bundle, a dynamic belt is driven to eject the paper bundle from an ejection portion and convey it to a bookbinding machine to perform subsequent processing. 
     BRIEF SUMMARY 
     The paper conveyance device described in JP 2001-019261 A conveys a paper bundle to a bookbinding machine when paper sheets ejected from a printer are piled up to reach a predetermined number. Therefore, timing for conveyance depends on the printing speed of the printer, and it is necessary to adjust the timing of processing on the bookbinding machine side. Furthermore, because the processing speed of the bookbinding machine side depends on the printing speed of the printer, it is difficult to improve efficiency. 
     In light of the above, an object of the present disclosure is to provide a conveyance control device and a conveyance control method that can convey paper at an appropriate timing according to the processing cycle in a downstream paper processing device. 
     The first aspect of the present disclosure is a conveyance control device for controlling a paper conveyance request timing of a paper conveyance device for conveying paper ejected from a first paper processing device to a downstream second paper processing device, the conveyance control device including a conveyance request unit configured to transmit a conveyance request signal to the paper conveyance device at a conveyance request timing corresponding to a processing cycle of the second paper processing device, a passage information reception unit configured to receive a paper passage signal indicating that paper has been sent from the paper conveyance device, and a determination unit configured to determine whether there is a conveyance delay based on a reception timing of the paper passage signal, wherein the conveyance request unit is configured to transmit the conveyance request signal at the conveyance request timing corresponding to the next processing cycle when it is determined that a conveyance delay has not occurred, and the conveyance request unit is configured not to transmit the conveyance request signal at the conveyance request timing corresponding to the next processing cycle when it is determined that a conveyance delay has occurred. 
     The second aspect of the present disclosure is a conveyance control method for controlling a paper conveyance request timing of a paper conveyance device for conveying paper ejected from an upstream first paper processing device to a downstream second paper processing device, the method comprising transmitting a conveyance request signal to the paper conveyance device at a conveyance request timing corresponding to a processing cycle of the second paper processing device, receiving a paper passage signal indicating that paper has been sent from the paper conveyance device, determining whether there is a conveyance delay based on a reception timing of the paper passage signal, a step of transmitting the conveyance request signal at the conveyance request timing corresponding to the next processing cycle when it is determined that a conveyance delay has not occurred, and a step of not transmitting the conveyance request signal at the conveyance request timing corresponding to the next processing cycle when it is determined that a conveyance delay has occurred. 
     The third aspect of the present disclosure is a non-transitory computer readable storage medium storing a computer program for causing a computer to function as the conveyance control device. 
     The fourth aspect of the present disclosure is a paper processing device to which paper is supplied from a paper conveyance device, the paper processing device including the conveyance control device. 
     The fifth aspect of the present disclosure is a paper processing system including a paper conveyance device for conveying paper ejected from a first paper processing device, a second paper processing device to which paper is supplied from the paper conveyance device, and the conveyance control device. 
     The sixth aspect of the present disclosure is a paper conveyance device for conveying paper ejected from an upstream first paper processing device to a downstream second paper processing device, the paper conveyance device including a paper piling area where paper ejected from the first paper processing device is piled up, a sensor provided in a conveyance path for conveying paper from the paper piling area to the second paper processing device, the sensor detecting that the paper has passed, and a control device, wherein the control device conveys paper when a conveyance request signal is received, and the control device transmits a paper passage signal when passage of the paper is detected by the sensor. 
     According to the present disclosure, it is possible to bring about an effect of being able to convey paper at an appropriate timing according to a processing cycle in a downstream paper processing device. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a function block diagram illustrating an overall schematic configuration of the paper processing system according to one embodiment of the present disclosure. 
         FIG. 2  is a schematic side view of the paper conveyance device and the paper processing device downstream according to one embodiment of the present disclosure. 
         FIG. 3  is a schematic planar view of the paper conveyance device according to one embodiment of the present disclosure. 
         FIG. 4  is a diagram illustrating an example of a hardware configuration of the control device according to one embodiment of the present disclosure. 
         FIG. 5  is a function block diagram illustrating one example of a function realized by the conveyance control unit according to one embodiment of the present disclosure. 
         FIG. 6  is a diagram for describing the conveyance request timing according to one embodiment of the present disclosure. 
         FIG. 7  is a flowchart illustrating one example of a processing procedure performed by the conveyance control unit and control device of the paper conveyance device according to one embodiment of the present disclosure. 
         FIG. 8  is a flowchart illustrating one example of a paper feed control processing procedure performed by the paper feed control unit relating to one embodiment of the present disclosure. 
         FIG. 9  is a flowchart illustrating one example of a timing correction processing procedure performed by the timing correction unit according to one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     One embodiment of the conveyance control device, a conveyance control method, and a program according to the present disclosure is described below with reference to the drawings. 
       FIG. 1  is a function block diagram illustrating an overall schematic configuration of a paper processing system  10  according to one embodiment of the present disclosure. As illustrated in  FIG. 1 , the paper processing system  10  is provided with a paper conveyance device  100 , an upstream paper processing device (a first paper processing device)  101 , and a downstream paper processing device (a second paper processing device)  102 . The paper conveyance device  100 , for example, is linked to the paper processing device  101  and the paper processing device  102  as illustrated in  FIG. 2 , which will be described hereafter. 
     The paper processing device  101  performs predetermined processing on paper, and ejects paper that has been processed to the paper conveyance device  100 . Examples of the paper processing device  101  include a printer, an unwinder device having a cutting machine, and the like. 
     The paper conveyance device  100  temporarily piles up paper ejected from the paper processing device  101  and supplies the piled up paper sheets one at a time or at a predetermined number at a time to the downstream paper processing device  102 . The paper processing device  102  receives the supply of paper from the paper conveyance device  100 , performs predetermined processing on the paper, and ejects the processed paper. Examples of the paper processing device  102  include a rotating punching machine, a saddle stitching machine, a cutting device, and the like. For example, the paper processing device  102  is a device for continuously performing processing at predetermined cycles. 
     For example, the paper conveyance device  100  is provided with a control device  50 , the paper processing device  101  is provided with a control device  60 , and the paper processing device  102  is provided with a control device  70 . 
     The control devices  50 ,  60 , and  70 , for example, may be connected via a common communication network and be configured to mutually give and receive information. Note that the method of connection for communication and communication protocol are not particularly limited. That is, in the present embodiment, at least the control device  60  and the control device  70  may be connected so that a series of processes described hereafter can be realized. 
     The control device  70  of the paper processing device  102  is provided with, for example, a conveyance control unit (conveyance control device)  71 , a paper feed control unit  72 , a processing control unit  73 , and the like. Details of each of these control units will be described hereafter. 
     In the present embodiment, a case is given as an example wherein the control device  70  of the paper processing device  102  has the conveyance control unit  71  mounted thereon, but the present disclosure is not limited to this. For example, the conveyance control unit  71  may be separately disposed as an independent control device, may be mounted on an upper device such as the control device  70 , and may be mounted on the control device  50 . That is, the paper processing system  10  may have the overall function of the conveyance control unit  71 , and the specific device for realizing this function is not particularly limited. For example, the control device  70  may have a portion of the functions of the conveyance control unit  71 , and the control device  50  may have a portion of the functions of the conveyance control unit  71 . Details of various processes executed by the conveyance control unit  71  and the like will be described hereafter. 
     Furthermore, the paper processing system  10  does not necessarily have to have the paper processing device  101  on the upstream side. For example, it may be configured such that paper processed by the upstream paper processing device  101  is installed in the paper piling area  15  (see  FIG. 2 ) of the paper conveyance device  100  by a robot such as an automatic conveyance vehicle or a person. 
       FIG. 2  is a schematic side view of the paper conveyance device  100  and the paper processing device  102 , and  FIG. 3  is a schematic planar view of the paper conveyance device  100 .  FIG. 2  illustrates a case where a rotating punching machine is applied as an example of the paper processing device  102 . However, as described above, the paper processing device  102  is not limited to a rotating punching machine. 
     Furthermore, the configurations of the paper conveyance device  100  and the paper processing device  102  described below are examples, and the present disclosure is not limited to these examples. For example, alternative configurations can be used, and portions of these configurations can be modified or omitted. 
     As illustrated in  FIGS. 2 and 3 , the paper conveyance device  100  is provided with a first conveyance unit  5 . The first conveyance unit  5  conveys the paper sheets piled up in the paper piling area  15  to the paper processing device  102 . The first conveyance unit  5  is provided with, for example, a suction type belt conveyor (hereafter referred to as “conveyor”). As illustrated in  FIG. 3 , for example, the conveyor is provided with a driving roller  1 , an idle roller  2 , a plurality of endless conveyor belts  3  spanned between the driving roller  1  and the idle roller  2 , a conveyance driving unit  4 , and the like. 
     The driving roller  1  is provided with, for example, a rotating shaft and four first pulleys (not illustrated) arranged at mutual intervals in the axial direction of the rotating shaft. The first pulleys are rotatably and integrally attached to the rotating shaft. 
     The idle roller  2  is provided with, for example, a shaft parallel to the rotating shaft of the driving roller  1 , and four second pulleys (not illustrated) rotatable around the shaft. The second pulleys are arranged to oppose each of the four first pulleys. 
     Each conveyor belt  3  is spanned between the first pulleys of the driving roller  1  and the second pulleys of the idle roller  2 . Each conveyor belt  3  has a plurality of ventilation holes  3   a  provided at predetermined intervals over the entire length thereof. Note that, as illustrated in  FIG. 3 , the conveyor belt  3  may be configured by a plurality of belts, or may be configured by a single belt. 
     The conveyance driving unit  4 , for example, rotates the rotating shaft of the driving roller  1  at a fixed speed to move the conveyor belt  3  at a fixed speed. As a result, the paper arranged on the upper surface (paper conveying surface) of the conveyor belt  3  is conveyed toward the paper processing device  102  at a predetermined speed. The conveyance driving unit  4  is provided with, for example, a pulley  4   a  fixed to one end of the driving shaft of the driving roller  1 , a motor  4   b  having a driving shaft parallel to the driving roller  1 , a pulley  4   c  fixed to the driving shaft of the motor  4   b , and an endless belt  4   d  spanned between the pulley  4   a  and the pulley  4   c . For example, the number of revolutions of the motor  4   b  may be changed. By controlling the number of revolutions, it is possible to adjust the conveying speed of the first conveyance unit  5 . 
     A restraining plate (stopper)  14  is provided on the upper surface of the conveyor belt  3 , being provided along the width direction orthogonal to the longitudinal direction of the conveyor belt  3 . A restraining plate  14  may be provided corresponding to each of the conveyor belts  3 , or may be a single plate arranged so as to cross the entire conveying surface of the four conveyor belts  3 . The restraining plate  14  can be moved along the longitudinal direction of the conveyor belt  3 , and the arrangement position is changed depending on the size of the paper ejected from the paper conveyance device  100 . The restraining plate  14  is held by a restraining plate holding portion  14   a.    
     As illustrated in  FIG. 2 , a carry-in roller  13  is provided in the vicinity of the connecting portion with the paper processing device  101 . The carry-in roller  13  accepts paper discharged from the paper processing device  101 . The front end of the paper accepted by the carry-in roller  13  impacts the restraining plate  14 , and the paper is sequentially piled up in the paper piling area  15 . The paper piling area  15 , for example, is an area provided between the lower end of the carry-in roller  13  and the restraining plate  14 , and the size thereof changes depending on the arrangement of the restraining plate  14 ; that is, depending on the size of the paper. 
     In the paper conveyance device  100 , a first sensor  51  is provided downstream from the paper piling area  15 . The first sensor  51  detects that paper has passed a first paper detection position virtually set in the conveyance path of the paper in the first conveyance unit  5 . The first sensor  51  is installed, for example, on a position where it can be confirmed that the paper has been stably conveyed. 
     In the paper conveyance device  100 , a carry-out roller  16  is provided in the vicinity of the connecting portion with the paper processing device  102 . The carry-out roller  16  accepts paper conveyed on the upper surface of the conveyor belt  3  and ejects it to the paper processing device  102 . 
     In the paper conveyance device  100 , a sensor for detecting the passage of paper may be provided downstream from the carry-in roller  13 , for example, in the vicinity of the paper ejection portion of the carry-in roller  13 . This sensor is used, for example, to count the number of sheets of paper ejected from the paper processing device  101 . 
     Similarly, a sensor for detecting the passage of paper may be provided upstream from the carry-out roller  16 , for example, in the vicinity of the paper accepting portion of the carry-out roller  16 . This sensor is used, for example, to count the number of sheets of paper ejected from the paper conveyance device  100 . 
     The paper conveyance device  100  is provided with, for example, a suction switching unit  7 . The suction switching unit  7  is provided with, for example, a suction box  11  and a suction fan (intake source)  12  as illustrated in  FIG. 3 . 
     The suction box  11  is arranged between the upper portion and the lower portion of the conveyor belt  3 . The suction box  11  is provided with, for example, an intake hole  11   a  on the upper surface. Each intake hole  11   a  is arranged so as to oppose the upper portion of each conveyor belt  3 . Furthermore, as illustrated in  FIG. 2 , the suction box  11  is provided with a shutter  11   b  that opens and closes the intake hole  11   a . The opening and closing of the shutter  11   b  is controlled by a shutter driving unit (not illustrated). The shutter driving unit is configured by, for example, a lift mechanism attached to the shutter  11   b , a motor attached to the lift mechanism, or the like. 
     As illustrated in  FIG. 3 , the suction fan  12  is, for example, directly connected to the suction box  11 , and is configured to generate negative pressure within the suction box  11 . For example, during the operation of the paper conveyance device  100 , the suction fan  12  is continually running. 
     Furthermore, the shutter  11   b  is controlled so as to open and close at a predetermined timing. As a result, when the shutter  11   b  is open, the paper arranged so as to oppose the suction box  11  is sucked onto the conveying surface of the conveyor belt  3  via the ventilation holes  3   a  provided in the conveyor belt  3 . Furthermore, when the shutter  11   b  is closed, the paper is not sucked to the conveyor belt  3 . 
     Each unit of the paper conveyance device  100  described above is controlled by the control device  50  (see  FIG. 1 ). The control device  50  controls, for example, a roller driving unit (not illustrated) that drives the carry-in roller  13 , a conveyance driving unit  4  that drives the first conveyance unit  5  (see  FIG. 3 ), and a roller driving unit that drives the carry-out roller  16  (not illustrated). Furthermore, the control device  50  controls the suction switching unit  7 , for example, the fan driving of the shutter driving unit (not illustrated) and suction fan  12  that controls the opening and closing of the shutter  11   b  of the suction box  11 . 
     Furthermore, the control device  50  controls the conveyance of paper based on a conveyance request signal transmitted from the conveyance control unit  71  (see  FIG. 5 ) described hereafter. For example, the control device  50  conveys the paper after receiving the conveyance request signal. More specifically, the control device  50  opens the shutter  11   b  of the suction box  11  to attract the bottommost paper from among the piled up paper sheets to the conveying surface of the conveyor belt  3  and separate it from the remaining paper sheets, and the separated paper is conveyed to the paper processing device  102  by the first conveyance unit  5 . 
     According to the paper conveyance device  100  described above, while operating, paper is accepted by the carry-in roller  13  from the upstream paper processing device  101 , and the front end of the paper impacts the restraining plate  14  and is sequentially piled up on the paper piling area  15 . Furthermore, by opening the shutter  11   b  of the suction box  11 , the bottommost paper from among the piled up paper sheets is attracted to the conveying surface of the conveyor belt  3  by the suction box  11  and is separated from the other paper sheets. By driving the driving roller  1 , the bottommost paper is supplied to the downstream paper processing device  102  by the conveyor belt  3 . 
     Next, the paper processing device  102  will be described. The paper processing device  102  is a device for continuously processing in, for example, a predetermined cycle. As an example thereof, in the present embodiment, a rotating punching machine (rotary die cutter) that continuously performs punching processing will be described. Here, “punching processing” includes, for example, embossing processing, ribbing processing, perforation processing, and the like. 
     As illustrated in  FIG. 2 , the paper processing device  102 , which is a rotating punching machine is provided with, for example, a second conveyance unit  22  and a punching unit  24 . Further, the paper processing device  102  may be provided with a carry-in roller  21 , a paper positioning roller  23 , and the like. 
     The carry-in roller  21  accepts paper conveyed from the paper conveyance device  100 . For example, the carry-in roller  21  is provided in the vicinity of the connecting portion with the paper conveyance device  100 , and ejects the accepted paper to the second conveyance unit  22 . For example, a second sensor  52  for detecting the passage of paper is provided between the carry-in roller  21  and the second conveyance unit  22 . The second sensor  52  outputs a sensor detection signal to the control device  70  when, for example, the front end of the paper in the conveying direction is detected. Note that the second sensor  52  may be omitted as appropriate. 
     The second conveyance unit  22  conveys the paper accepted by the carry-in roller  21  to the punching unit  24 . The second conveyance unit  22  is provided with, for example, a suction type belt conveyor (hereafter referred to as “conveyor”). For example, the conveyor is provided with a driving roller  31 , an idle roller  32 , an endless conveyor belt  33  spanned between the driving roller  31  and the idle roller  32 , a conveyance driving unit  34 , and the like. The configuration of the driving roller  31  and the idle roller  32  is, for example, the same as that of the first conveyance unit  5  of the paper conveyance device  100  described above. 
     Similar to the conveyor belt  3  illustrated in  FIG. 3 , the conveyor belt  33  may be configured by a plurality of belts, or may be configured by a single belt. Moreover, similar to conveyor belt  3 , the conveyor belt  33  has a plurality of ventilation holes (not illustrated) provided at predetermined intervals over the entire length thereof. 
     The conveyance driving unit  34 , for example, rotates a rotating shaft of the driving roller  31  at a fixed speed to move the conveyor belt  33  at a fixed speed. As a result, the paper arranged on the conveyor belt  33  is conveyed to the downstream punching unit  24  described hereafter. The conveyance driving unit  34  is provided with, for example, a motor fixed to one end of the rotating shaft of the driving roller  31 . Furthermore, as illustrated in  FIG. 3 , the motor may be indirectly connected to the drive shaft of the driving roller via a pulley and a belt. For example, the number of revolutions of the motor may be changed. 
     Furthermore, the paper processing device  102  may include a suction switching unit (not illustrated) similar to the paper conveyance device  100 . 
     The punching unit  24  is provided with a processing roller  35  and a receiving roller  36 . The processing roller  35  is, for example, arranged in parallel with the driving roller  31 . The receiving roller  36  is provided so as to oppose the processing roller  35  with the conveying surface interposed therebetween. For example, the receiving roller  36  is arranged parallel to the processing roller  35  and the peripheral surface thereof is arranged at a fixed interval from the peripheral surface of the processing roller  35 . For example, a sheet-shaped blade  35   a  (see  FIG. 6 ) is mounted on the peripheral surface of the processing roller  35 . 
     The processing roller  35  is rotationally driven by the roller driving unit  37 . The roller driving unit  37  has, for example, a motor  42 . By controlling the revolutions of the motor  42  to be at a predetermined rotation speed, the processing roller  35  and the receiving roller  36  rotate in synchronization at equal speeds. 
     For example, the roller driving unit  37  is provided with a pulley  41  fixed to one end of the driving shaft of the receiving roller  36 , the motor  42  having a driving shaft parallel to the receiving roller  36 , a pulley  43  fixed to the driving shaft of the motor  42 , and an endless belt  44  spanned between the pulley  41  and the pulley  43 . By driving the motor  42 , the receiving roller  36  rotates at a constant speed. 
     Furthermore, an interlocking connection mechanism (not illustrated) is connected to the rotating shaft of the receiving roller  36 . As a result, the processing roller  35  is rotated in synchronization with the rotation of the receiving roller  36 . 
     Note that the configuration of the roller driving unit  37  is one example, and a well-known roller driving unit can be appropriately adopted. 
     A rotation position detection unit  45  is arranged between the receiving roller  36  and the motor  42 . A rotary encoder is one example of the rotation position detection unit  45 . An output pulse of the rotation position detection unit  45  is output to the control device  70  (see  FIG. 1 ). The control device  70  calculates, for example, the rotation position (0° to 360°) of a reference position P 0  virtually set in the processing roller  35  based on the output pulse from the rotation position detection unit  45 . 
     Furthermore, upstream from the processing roller  35  and the receiving roller  36 , the paper positioning roller  23  is provided that receives the paper from the second conveyance unit  22  and supplies the paper to the processing roller  35 . 
     Furthermore, a third sensor  53  for detecting the passage of paper is provided on a second paper detection position virtually set between the paper positioning roller  23  and the processing roller  35 . In other words, the paper detection position by the third sensor  53  is the second paper detection position. The third sensor  53 , for example, transmits a sensor detection signal to the control device  70  (see  FIG. 1 ) when detecting that the front end of the paper has passed. Furthermore, a flat support plate that supports the lower surface of the paper may be provided between the paper positioning roller  23  and the processing roller  35 . 
     During operation of the paper processing device  102 , the processing roller  35  and the receiving roller  36  are continuously rotationally driven by the roller driving unit  37  at a fixed speed. Further, the paper carried in from the paper conveyance device  100  via the carry-in roller  21  is conveyed toward the punching unit  24  by the second conveyance unit  22 . The paper that has been conveyed by the second conveyance unit  22  passes a gap in the paper positioning roller  23  and is conveyed to the punching unit  24 . In the punching unit  24 , the paper is punched by the blade  35   a  (see  FIG. 6 ) when passing between the processing roller  35  and the receiving roller  36 . The punched paper is conveyed by a third conveyance unit  25  provided downstream, and is piled up in a predetermined piling area (not illustrated). Note that for the configuration of the third conveyance unit  25 , for example, the same configuration as that of the second conveyance unit  22 , or a well-known configuration is adopted. 
     Each unit provided in the paper processing device  102  described above is controlled by the control device  70 . The control device  70 , for example, controls the roller driving unit (not illustrated) that drives the carry-in roller  21 , the conveyance driving unit  34 , the roller driving unit (not illustrated) that drives the paper positioning roller  23 , the roller driving unit  37  that drives the punching unit  24 , the conveyance driving unit (not illustrated) that drives the third conveyance unit  25 , and the like. More specifically, the roller driving unit (not illustrated) that drives the carry-in roller  21 , the conveyance driving unit  34 , the roller driving unit (not illustrated) that drives the paper positioning roller  23 , and the conveyance driving unit (not illustrated) that drives the third conveyance unit  25  are controlled by the paper feed control unit  72 . Furthermore, the roller driving unit  37  that drives the punching unit  24  is controlled by the processing control unit  73 . Furthermore, the conveyance control unit  71  supplies paper to the punching unit  24  at an appropriate timing in cooperation with the paper feed control unit  72 . 
     Furthermore, the sensor detection signals of the second sensor  52  and the third sensor  53  provided in the paper processing device  102  are input to the control device  70 . The conveyance control unit  71  and the paper feed control unit  72  of the control device  70  convey paper and feed paper based on these sensor detection signals. 
     Next, the conveyance control unit  71  that controls the timing for conveying the paper of the paper conveyance device  100  in the paper processing system  10  described above will be described. In the present embodiment, a case is given as an example wherein the conveyance control unit  71  is mounted in the control device  70 , but as described above, the present disclosure is not limited to this example. 
       FIG. 4  is a diagram illustrating an example of a hardware configuration of the control device  70  according to the present disclosure. As illustrated in  FIG. 4 , the control device  70  is provided with, for example, a CPU  81 , a storage unit  82  for storing a program executed by the CPU  81  and data or the like referenced by the program, a main memory  83  functioning as a work area when executing each program, a communication interface  84  for connecting to a network, an input device  85 , a display  86 , and the like. Each of these units is connected via, for example, a bus  88 . Examples of the storage unit  82  include magnetic disks such as hard disk drives (HDD), magneto-optical disks, semiconductor memories such as solid state drives (SSD), and the like. 
     As an example, a series of processes for realizing the various functions described below are stored in the storage unit  82  in the form of a program (for example, a conveyance control program, a paper feed control program, a processing control program, and the like), and the CPU  81  reads these programs in the main memory  83  and executes information processing and computational processing to realize the various functions. Note that programs may be adapted in the form of a program pre-installed in the storage unit  82 , a program provided being stored in another computer-readable storage medium, a program distributed via wired or wireless communication means, or the like. Examples of a computer-readable storage medium include a magnetic disk, a magneto-optical disk, CD-ROM, DVD-ROM, semiconductor memory, and the like. 
     Note that the control device  50  also has a similar configuration, and the various functions and processes described hereafter are realized by a processor such as a CPU reading a program stored in the storage unit to the main memory and executing computational processing. 
       FIG. 5  is a function block diagram illustrating one example of a function realized by the conveyance control unit  71  according to the present embodiment. 
     As illustrated in  FIG. 5 , the conveyance control unit  71  is provided with, for example, a conveyance request unit  93 , a passage information reception unit  94 , a determination unit  95 , and the like. Furthermore, the conveyance control unit  71  may be further provided with a storage unit  90 , a timing setting unit  91 , and a conveyance trigger generation unit  92 . Furthermore, the conveyance control unit  71  may be further provided with, for example, a conveyance delay notification unit  96 . Moreover, the conveyance control unit  71  may be further provided with a timing correction unit  97 . 
     The timing setting unit  91  sets the conveyance request timing corresponding to a processing cycle of the paper processing device  102 . For example, the timing setting unit  91  sets the conveyance request timing when starting operation of the paper processing system  10 . Furthermore, when there are changes in set values such as the paper size, the paper conveying speed, and the rotation speed of the processing roller, the conveyance request timing is set. The paper size, the paper conveying speed, the rotation speed of the processing roller, and the like are set by being input from, for example, the input device  85  (see  FIG. 4 ) provided in the control device  70 . Furthermore, it may be configured to receive from another control device (for example, a higher-level device) via a network. 
     As described above, the paper processing device  102  performs processing (punching) in a predetermined cycle during operation. Therefore, it is necessary to supply the paper to the processing roller  35  at an appropriate timing according to the processing cycle. The timing setting unit  91  sets the paper conveyance request timing according to such periodic and continuously performed processing. 
     The conveyance request timing will be described below with reference to  FIG. 6 . 
     As illustrated in  FIG. 6 , the blade  35   a  is attached on a predetermined range on the outer circumference of the processing roller  35  of the paper processing device  102 . Furthermore, a reference position P 0  is set on the processing roller  35 . This reference position P 0  is a virtual position set for convenience in order to synchronize with the conveyance request timing. 
     In the present embodiment, as an example, when the reference position P 0  reaches the lowest point S of the processing roller  35 , control is performed so that the front end of the paper reaches the lowest point S of the processing roller  35 . In the processing roller  35 , a distance d 1  between the reference position P 0  and a front end P 1  of the blade  35   a  is a distance corresponding to the processing start position on the paper. That is, it can be said that the reference position P 0  is a virtual position that is set each time according to the front end P 1  of the blade  35   a  and the processing start position of the paper. 
     The conveyance request timing can be found by calculation based on, for example, a distance L 1  between a lowest point S of the processing roller  35  and the installation position of the third sensor  53 , a distance L 2  between the third sensor  53  and the second sensor  52 , a distance L 3  between the second sensor  52  and the first sensor  51 , a rotation speed v 1  of the processing roller  35 , and a conveying speed v 2  of the paper. Note that the paper conveying speed of the paper conveyance device  100  and the paper conveying speed of the paper processing device  102  are set to the same speed. Note that the second sensor  52  can be omitted. In such a case, the distance from the third sensor  53  to the first sensor  51  (L 2 +L 3 ) may be used. 
     For example, the time t from when the paper passes the first sensor  51  to when it reaches the lowest point S of the processing roller  35  (hereinafter referred to as “conveyance time”) is expressed by the following formula. 
         t =( L 1+ L 2+ L 3)/ v 2  (1)
 
     Therefore, the conveyance request timing is set prior to the time t from the timing when the reference position P 0  of the processing roller  35  reaches the lowest point S of the processing roller  35 . In other words, the conveyance request timing is the timing at which the reference position P 0  reaches the rotation position P 2 , as shown in  FIG. 6 . 
     The distance d 2  between the reference position P 0  and the rotation position P 2  is expressed by the following formula (2). 
         d 2= v 1× t   (2)
 
     Here, the distances L 1  to L 3 , the rotation speed v 1 , and the paper conveying speed v 2  are values based on, for example, design values. Furthermore, in a system in which the rotation speed v 1  of the processing roller  35  and the paper conveying speed v 2  can be changed, the input set values corresponding to each time may be used. 
     The information of the conveyance request timing set by the timing setting unit  91  is stored in the storage unit  90 . For example, a determination condition for determining the conveyance request timing is stored in the storage unit  90 . Examples of the determination condition include information relating to the rotation position P 2  of the processing roller  35 . More specifically, the angle information of the rotation position P 2  with respect to the reference position P 0 , the distance d 2  from the reference position P 0  to the rotation position P 2 , the time information from when the reference position P 0  passes the lowest point S to when it reaches the rotation position P 2 , and the like are included. 
     In the present embodiment, a case is described below as an example wherein the rotation position of the rotation position P 2  is stored in the storage unit  90  as information of the conveyance request timing. Note that because the rotation position P 2  is a rotation position used for determining the conveyance request timing, it is hereinafter referred to as “conveyance determination position P 2 .” 
     The conveyance trigger generation unit  92  generates a trigger based on information of the conveyance request timing stored in the storage unit  90 . For example, the conveyance trigger generation unit  92  generates a conveyance trigger when the conveyance determination position P 2  and the reference position P 0  stored in the storage unit  90  match. For example, the conveyance trigger generation unit  92  calculates the rotation position (0° to 360°) of the reference position P 0  virtually set in the processing roller  35  based on the output pulse from the rotation position detection unit  45 . The conveyance trigger is generated when the rotation position of the reference position P 0  matches the conveyance determination position P 2 . 
     When the conveyance trigger is generated by the conveyance trigger generation unit  92 , the conveyance request unit  93  transmits a conveyance request signal to the control device  50  of the paper conveyance device  100 . More specifically, when a conveyance normal signal is input from the determination unit  95  described hereafter, the conveyance request unit  93  transmits the conveyance request signal at the next paper feed trigger. Meanwhile, when the conveyance delay signal is input from the determination unit  95 , the conveyance request unit  93  does not transmit the conveyance request signal at the next paper feed trigger; that is, the conveyance request unit  93  skips transmitting the conveyance request signal at this timing, and waits until the paper feed trigger occurs again. 
     The control device  50  of the paper conveyance device  100  feeds the paper after receiving the conveyance request signal. Specifically, the control device  50  opens the shutter  11   b  of the suction box  11 , and the bottommost paper from among the paper sheets piled up on the paper piling area  15  is separated from the other paper sheets. Accordingly, one sheet of separated paper is supplied to the paper processing device  102  by the conveyor belt  3 . 
     When the first sensor  51  detects the passage of paper in the paper conveyance device  100 , the first sensor  51  outputs a sensor detection signal to the control device  50 . The control device  50  transmits a paper passage signal to the control device  70  after receiving the sensor detection signal. 
     Here, it is preferable that the first sensor  51  outputs a sensor detection signal when the front end of the paper is detected. This is because, for example, when trying to detect the back end of the paper, the time from when the front end passes to when the back end is detected changes when the size of the paper changes, which complicates the computational processing. Furthermore, because the reference position P 0  on the processing roller  35  is also set according to the front end of the paper, it is preferable to detect the front end of the paper to simplify the computational processing. Note that the same applies to the second sensor  52  and the third sensor  53 . 
     The passage information reception unit  94  of the conveyance control unit  71  receives a paper passage signal. 
     The determination unit  95  determines whether there is a conveyance delay based on the reception timing of the paper passage signal. For example, the determination unit  95  determines whether a conveyance delay has occurred depending on whether the paper passage signal is received within a predetermined period after the conveyance request signal is transmitted by the conveyance request unit  93 . 
     For example, the predetermined period is set based on the time required from when the conveyance control unit  71  transmits the conveyance request signal until the paper conveyance device  100  conveys the paper in accordance with the conveyance request signal and the paper passes the installation position of the first sensor  51 , and the adjustment time determined based on the mechanical properties of the paper positioning roller  23 . For example, even if there is a slight deviation (error) in the conveyance timing in the paper conveyance device  100 , as long as the time deviation is within a range that can be adjusted by the paper positioning roller  23 , the rotation speed of the paper positioning roller  23  can be adjusted (including stopping rotation) to supply the paper to the processing roller  35  at an appropriate supply timing. However, if there is a conveyance timing deviation that exceeds a range that can be adjusted by the paper positioning roller  23 , this time deviation cannot be absorbed by the paper positioning roller  23 , so paper feeding must be stopped for one processing cycle and paper feeding must be started in the next processing cycle. The “predetermined period” corresponds to a time range of the paper conveyance timing that can be adjusted by the paper positioning roller  23  in this manner. The “predetermined period” is set in consideration of, for example, the acceleration/deceleration range of the driving motor that drives the paper positioning roller  23 , the paper supply speed at which the paper positioning roller  23  can reliably grip (hold) the paper, and the like. 
     The determination unit  95  outputs a conveyance normal signal when, for example, the paper passage signal is received within the predetermined period after the conveyance request signal is transmitted. Meanwhile, the conveyance delay signal is output when the paper passage signal is not received within the predetermined period. The conveyance normal signal is output to, for example, the conveyance request unit  93 . Furthermore, the conveyance delay signal is, for example, output to the conveyance request unit  93  and the conveyance delay notification unit  96 . 
     When the conveyance delay signal is input, the conveyance delay notification unit  96  outputs the conveyance delay signal to the paper feed control unit  72 . When the conveyance delay signal is input, the paper feed control unit  72  temporarily stops the paper positioning roller  23  and adjusts the timing of paper feeding to the processing roller  35 . The control performed by the paper feed control unit  72  will be described later. 
     The timing correction unit  97  corrects the conveyance request timing information stored in the storage unit  90 . For example, the conveyance request timing set by the timing setting unit  91  described above is a theoretical value obtained via computation. However, during actual operation, the paper feeding time by the first conveyance unit  5 , the time required to take out one sheet from the paper piling area  15  and move it, and the time from when the paper conveying begins to when the lowest point S of the processing roller  35  is reached may deviate from the theoretical value due to various errors such as conveying speed by the first conveyance unit  5  and the second conveyance unit  22 . Similarly, the rotation speed of the processing roller  35  may change due to deviations due to the vertical movement of the processing roller. The timing correction unit  97  is provided to correct such deviations. Note that the details of the correction method by the timing correction unit  97  will be described later. 
     Next, various processes performed by the conveyance control unit  71  described above will be described with reference to drawings. 
       FIG. 7  is a flowchart illustrating one example of a processing procedure executed by the conveyance control unit  71  and control device  50  of the paper conveyance device  100 . The series of processes executed in the conveyance control unit  71  described hereafter are stored in the storage unit  82  (see  FIG. 4 ) in the form of a program (for example, a conveyance control program and the like) and realized by the CPU (processor)  81  reading this program in the main memory  83  and executing information processing and computational processing. Moreover, the same applies to the control device  50 . 
     First, during operation, the conveyance control unit  71  generates a conveyance trigger at the conveyance request timing according to the processing cycle (SA 1 ), and transmits the conveyance request signal to the control device  50  of the paper conveyance device  100  at the timing when the conveyance trigger occurs. (SA 2 ). The control device  50  receives the conveyance request signal (SA 3 ) and then conveys the paper (SA 4 ). When the passage of the paper is detected by the first sensor  51  (SA 5 ), the control device  50  transmits the paper passage signal to the conveyance control unit  71  (SA 6 ). 
     Upon receiving the paper passage signal (SA 7 ), the conveyance control unit  71  determines whether a conveyance delay has occurred. For example, after the conveyance request signal is transmitted, it is determined whether the paper passage signal has been received within the predetermined period (SA 8 ). As a result, when the paper passage signal is received within the predetermined period, it is determined that there is no conveyance delay (SA 8 : NO), and the process returns to step SA 1 . As a result, the conveyance request signal is transmitted to the control device  50  of the paper conveyance device  100  at the timing when the next conveyance trigger occurs (SA 1 , SA 2 ). 
     Meanwhile, in step SA 8 , for example, when the paper passage signal is not received within the predetermined period, it is determined that there is a conveyance delay (SA 8 : YES), and the conveyance delay signal is output to the paper feed control unit  72  (SA 9 ). As a result, as will be described hereafter, in the paper feed control unit  72  of the control device  70 , processing is performed to adjust the timing of the paper in which the conveyance delay has occurred. 
     Subsequently, when the conveyance trigger occurs (SA 10 ), the process returns to step SA 1  without transmitting the conveyance request signal (SA 11 ) at this conveyance trigger. 
     In this manner, when it is determined in step SA 8  that a conveyance delay has occurred, the conveyance request signal is not transmitted when the next conveyance trigger is generated, in other words, the transmission of the conveyance request signal is skipped, and it will be in a standby state until the next conveyance trigger occurs. As a result, it is possible to prevent a plurality of sheets from accumulating in the paper processing device  102  due to the next sheet being conveyed even though a conveyance delay has occurred. 
     Furthermore, when the paper accumulates in this manner, a larger than necessary supply of paper to the processing roller  35  must be prevented. Therefore, by controlling as in the present embodiment, it is possible to promptly start paper feeding without stopping paper feeding more than necessary. As a result, it is possible to suppress decreases in processing efficiency. 
     Next, the process executed by the paper feed control unit  72  during the operation of the paper processing system  10  will be described. The series of processes described hereafter are stored in the storage unit  82  (see  FIG. 4 ) provided in the control device  70  in the form of a program (for example, a paper feed control program and the like), this program is read into the main memory  83  by the CPU  81 , and various functions are realized by executing information processing and computational processing. 
       FIG. 8  is a flowchart illustrating one example of a paper feed control processing procedure performed by the paper feed control unit  72 . 
     First, when paper is detected by the third sensor  53  (SB 1 : YES), it is determined whether the conveyance delay signal is input (SB 2 ). Specifically, it is determined whether the conveyance delay signal has been input between the previous paper detection by the third sensor  53  and the current paper detection. 
     As a result, when the conveyance delay signal is not input (SB 2 : NO), the paper is supplied to the processing roller  35  by the paper positioning roller  23  (SB 3 ), and the process returns to step SB 1 . 
     Meanwhile, when the conveyance delay signal is input (SB 2 : YES), the paper positioning roller  23  is stopped and the supplying of paper is temporarily stopped (SB 4 ). That is, when the conveyance delay signal is input, it can be seen that the paper detected by the third sensor  53  indicates the conveyance delay occurring in the paper conveyance device  100 . If such paper is supplied as is to the processing roller  35 , a positional deviation exceeding the error range will occur, resulting in a defective product. Therefore, in this case, the feeding of paper is temporarily stopped, and a standby mode is entered until the next paper feed timing. 
     Note that the “paper feed timing” is determined based on the rotation speed of the processing roller  35 , the distance L 1  between the processing roller  35  and the third sensor  53 , the rotation speed of the paper positioning roller  23 , and the like. Note that the timing may be determined according to the “conveyance request timing” setting method described above. 
     Subsequently, when the reference position P 0  (see  FIG. 6 ) of the processing roller  35  approaches the lowest point S and the next paper feed timing is reached, the paper feed control unit  72  restarts the rotation of the paper positioning roller  23  to supply paper to the processing roller  35  (SB 5 ), and the process returns to step SB 1 . 
     In this manner, when a paper conveyance delay occurs in the paper conveyance device  100 , a conveyance delay signal notifying the occurrence of a conveyance delay is output from the conveyance control unit  71  to the paper feed control unit  72 . As a result, the paper feed control unit  72  can adjust the supply timing of the paper in which the conveyance delay has occurred. That is, when a conveyance delay occurs, the paper positioning roller  23  is temporarily stopped to skip one processing cycle and enter a standby state, and the paper is supplied at the appropriate paper feed timing in the next processing cycle. As a result, even if a conveyance delay occurs, the front edge of the paper can be aligned with the reference position P 0 , and punching can be performed at an appropriate position. 
     Furthermore, in this manner, when one cycle of processing is skipped in the paper processing device  102  and the standby state is entered to match the timing, the conveying of paper is similarly held at standby in the paper conveyance device  100  (SA 10  and SA 11  in  FIG. 7 ). As a result, the paper feeding in the paper processing device  102  and the conveying in the paper conveyance device  100  can be linked, and a plurality of paper sheets can be prevented from accumulating in the paper processing device  102 . 
     Next, a method for correcting the conveyance request timing using the timing correction unit  97  (see  FIG. 6 ) will be described with reference to  FIG. 9 .  FIG. 9  is a flowchart illustrating one example of a timing correction processing procedure performed by the timing correction unit  97 . 
     The timing for correcting the conveyance request timing is not particularly limited, but examples include immediately after the conveyance request timing is set by the timing setting unit  91 , at a predetermined time interval, when a processing deviation amount exceeds a certain value, and the like. Furthermore, correction of the conveyance request timing by the timing correction unit  97  is performed when the paper processing system  10  is in operation; that is, when processing is being performed by the processing roller  35 . 
     For example, as illustrated in  FIG. 7 , the conveyance request signal is transmitted to the control device  50  based on the current conveyance request timing stored in the storage unit  90 , paper feeding is performed, and when the first sensor  51  detects the passage of paper, the paper passage signal is transmitted from the control device  50 . 
     When this paper is conveyed from the paper conveyance device  100  to the paper processing device  102  and detected by the third sensor  53  (SC 1 ), the timing correction unit  97  estimates the rotation position of the reference position P 0  when the front edge of the paper reaches the lowest point S of the processing roller  35  based on the timing of detection by the third sensor  53  (SC 2 ) This estimated position can be found by calculation based on the rotation position of the reference position P 0  in the processing roller  35  when the paper is detected by the third sensor  53 , the distance L 1  between the third sensor  53  and the lowest point S of the processing roller  35 , the rotation speed v 1  of the processing roller  35 , and the conveying speed v 2  of the paper. 
     Subsequently, the timing correction unit  97  calculates the difference X between the estimated rotation position of the reference position P 0  and the lowest point S of the processing roller  35  (SC 3 ). Next, the current conveyance determination position P 2 ; that is, the conveyance determination position P 2  stored in the storage unit  90 , is corrected by using a difference X (SC 4 ). Specifically, when the rotation position of the estimated reference position P 0  is ahead of the lowest point S, the conveyance determination position P 2  is corrected by the difference X in the direction approaching the lowest point S. As a result, the conveyance request timing of the conveyance request signal can be delayed by a time corresponding to the difference X. Meanwhile, when the estimated rotation position of the reference position P 0  is after the lowest point S, the conveyance determination position P 2  is corrected by the difference X in the direction going away from the lowest point S. As a result, the conveyance request timing of the conveyance request signal can be expedited by a time corresponding to the difference X. 
     By correcting the conveyance determination position P 2  in this manner, the deviation between the front edge of the paper and the reference position P 0  of the processing roller  35  can be reduced, and processing position deviation can be suppressed within a predetermined error range. 
     When the conveyance determination position P 2  is corrected, the timing correction unit  97  stores the corrected conveyance determination position P 2  in the storage unit  90  (SC 5 ). As a result, the conveyance determination position P 2  stored in the storage unit  90  is updated to the corrected conveyance determination position P 2 , and thereafter, the conveyance trigger is generated based on the updated conveyance determination position P 2 . 
     As described above, the following effects are brought about according to the conveyance control device, conveyance control method, and program according to the present embodiment. 
     For example, the conveyance control unit (conveyance control device)  71  according to the present embodiment is provided with the conveyance request unit  93  for transmitting a conveyance request signal to the paper conveyance device  100  at a conveyance request timing corresponding to the processing cycle of the paper processing device  102 , the passage information reception unit  94  for receiving a paper passage signal indicating that paper has been sent out from the paper conveyance device  100 , and the determination unit  95  for determining the presence of a conveyance delay based on the reception timing of the paper passage signal. 
     When it is determined by the determination unit  95  that a conveyance delay has not occurred, the conveyance request unit  93  transmits the conveyance request signal at a conveyance request timing corresponding to the next processing cycle. Meanwhile, when it is determined by the determination unit  95  that a conveyance delay has occurred, the device stands by until the next conveyance request timing without transmitting the conveyance request signal in the conveyance request timing corresponding to the next processing cycle. 
     In this manner, when a paper conveyance delay does not occur in the paper conveyance device  100 , paper is conveyed at the next processing timing, and the paper can thereby be supplied at an appropriate timing according to the processing timing. As a result, continuous operation is possible without reducing the processing capacity of the paper processing device  102 . 
     Furthermore, by not conveying paper at the next processing timing when a paper conveyance delay has occurred in the paper conveyance device  100 , a plurality of sheets of paper can be prevented from accumulating in the paper processing device  102 , which does occur when the next paper is conveyed even though a conveyance delay has occurred. 
     Furthermore, when the paper accumulates in this manner, a larger than necessary supply of paper to the processing roller  35  must be prevented. Therefore, by controlling as in the present embodiment, it is possible to promptly start paper feeding without stopping paper feeding more than necessary. As a result, it is possible to suppress decreases in processing efficiency. 
     Furthermore, the conveyance control unit (conveyance control device)  71  according to the present embodiment is provided with the timing correction unit  97  for correcting the conveyance request timing. The timing correction unit  97  is provided in the paper processing device  102 , estimates the actual processing position with respect to the paper based on the timing when the paper passes the paper detection position provided further upstream than the punching unit  24  that performs processing, and corrects the conveyance request timing based on the amount of deviation between the estimated processing position and a preset reference processing position. 
     Because the conveyance request timing is corrected based on the processing position during actual operation in this manner, the conveyance request signal can be transmitted at an appropriate conveyance request timing according to the operation state. This makes it possible to suppress the position deviation in processing within a predetermined error range. 
     Note that instead of the estimated processing position, the conveyance request timing may be corrected based on the amount of deviation between the actual processing position with respect to the paper and the preset reference processing position. 
     Furthermore, according to the conveyance control unit (conveyance control device)  71  according to the present embodiment, when the paper passage signal is not received within the predetermined period, the conveyance delay notification unit  96  is provided to notify the conveyance delay signal to the paper feed control unit  72 . 
     As a result, the paper feed control unit  72  can be notified in advance that there is a conveyance delay. As a result, the paper feed control unit  72  can adjust the timing of the paper in which the conveyance delay occurred, and paper can be supplied to the punching unit  24  at the appropriate paper feed timing. 
     Furthermore, an example was given in the present embodiment wherein the control device  70  is provided with the function of the conveyance control unit  71 , but the present disclosure is not limited to this. The conveyance control unit  71  may be mounted on the control device  50 , and may also be mounted on an upper level control device of the control device  70 . Furthermore, the conveyance control unit  71  may exist as an independent control device. 
     As described above, when the conveyance control unit  71  is mounted on a device different from the control device  70 , for example, information mutually shared between each unit provided in the paper processing device  102  and the conveyance control unit  71  may be transmitted and received via a network (communication medium). For example, information to be transmitted and received includes the conveyance delay signal, the output pulse by the rotation position detection unit  45 , the rotation position of the processing roller calculated based on the output pulse, and the like. 
     The present disclosure has been described above using the embodiments, but the technical scope of the present disclosure is not limited to the scope described in the above embodiments. Various modifications or improvements can be made to the above embodiments without departing from the main points of the invention, and the modified or improved forms are also included in the technical scope of the present disclosure. Furthermore, the above embodiments may be combined as appropriate. 
     Furthermore, the flow of information provision processing described in the above embodiments is one example, and unnecessary steps may be deleted, new steps may be added, or the processing order may be changed within a range that does not deviate from the main points of the present disclosure. 
     For example, in the embodiments described above, the determination unit  95  determines whether a conveyance delay has occurred based on whether the paper passage signal is received within a predetermined period after the conveyance request signal is transmitted. However, the method for determining whether a conveyance delay has occurred is not limited to this example. For example, the rotation position of the reference position P 0  of the processing roller  35  when the paper passage signal is received may be acquired from the rotation position detection unit  45 , and whether a conveyance delay has occurred may be determined based on whether this rotation position is within a predetermined position range of the processing roller  35 . Here, the “predetermined position range” is, for example, a position range corresponding to the above “predetermined period,” and can be calculated by computing based on the conveyance determination position P 2  and the rotation speed of the processing roller  35 . 
     Furthermore, as described above, when determining whether a conveyance delay has occurred based on the rotation position of the reference position P 0  of the processing roller  35  when a paper passage signal has been received, the timing correction unit  97  may correct the “predetermined position range.” In this case, for example, the timing correction unit  97  temporarily stores the rotation position of the processing roller  35  when the paper passage signal has been received as a temporary paper passage determination position, and the stored temporary paper passage determination position may be corrected by the difference X. The “predetermined position range” is corrected by giving a margin of a predetermined range to the front and back centered around the corrected paper passage determination position. This predetermined range margin is a rotation position range corresponding to the predetermined period. 
     REFERENCE NUMERALS 
     
         
           1 : Driving roller 
           2 : Idle roller 
           3 : Conveyor belt 
           3   a : Ventilation hole 
           4 : Conveyance driving unit 
           5 : First conveyance unit 
           10 : Paper processing system 
           11   b : Shutter 
           14 : Restraining plate 
           15 : Paper piling area 
           22 : Second conveyance unit 
           23 : Paper positioning roller 
           24 : Punching unit 
           35 : Processing roller 
           35   a : Blade 
           36 : Receiving roller 
           37 : Roller driving unit 
           45 : Rotation position detection unit 
           50 : Control device 
           51 : First sensor 
           52 : Second sensor 
           53 : Third sensor 
           60 : Control device 
           70 : Control device 
           71 : Conveyance control unit (conveyance control device) 
           72 : Paper feed control unit 
           73 : Processing control unit 
           90 : Storage unit 
           91 : Timing setting unit 
           92 : Conveyance trigger generation unit 
           93 : Conveyance request unit 
           94 : Passage information reception unit 
           95 : Determination unit 
           96 : Conveyance delay notification unit 
           97 : Timing correction unit 
           100 : Paper conveyance device 
           101 : Paper processing device 
           102 : Paper processing device