JP2014139097A - Sheet processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly determine presence or absence of a sheet at a predetermined position at a predetermined timing irrespective of a sheet feeding form.SOLUTION: A sheet processing device 20 includes: a sheet detector 100 that detects presence or absence of a sheet 1 at a predetermined position; a timing detector 101 that counts a sheet detection timing at which the sheet detector 100 detects presence or absence of the sheet 1; and a control unit 110 that determines, based on the result of detection by the sheet detector 100, whether transport of the sheet 1 is abnormal. When sheets are intermittently fed, at a timing at which the sheet 1 should be present at the predetermined position out of timings detected by the timing detector 101, the control unit 110 determines that presence of the sheet 1 is normal and absence of the sheet 1 is abnormal. At a timing at which the sheet 1 should not be present at the predetermined position out of the sheet detection timings, the control unit 110 determines that absence of the sheet 1 is normal and presence of the sheet is abnormal.

Description

  The present invention relates to a sheet processing apparatus in a printing press.

  The printing machine includes a paper supply unit as a supply unit that supplies paper as a sheet to be printed, a printing unit that performs printing on the supplied paper, and a paper discharge unit as a discharge unit that discharges the printed paper. Consists of. All of these operate at high speed, and the operation timing of other devices is measured based on the phase of the device in the printing unit as a reference, and the whole is interlocked.

  For example, when the cylinder that is driven to rotate by the power of the drive motor in the printing unit reaches a predetermined phase, the sucker device sucks only one sheet stacked on the sheet feeding unit in the sheet feeding unit and sends it to the feeder board. The swing device in the printing section performs an operation of transferring the sheet on the feeder board to the transfer cylinder in the printing section, and various operations in other devices. In this way, the cylinder of the printing unit and other devices are interlocked, and operations in various devices are repeated at the same cycle. Since the operation timings of various devices are matched, the risk of device damage, printing defects, and the like is reduced.

  However, there may be a malfunction such as two sheets of paper overlapped due to static electricity or the like being supplied at the same time, or paper not being supplied due to poor sucking by the sucker device. In such a case, if the printer continues to operate without being stopped, there is a risk of damage to the equipment due to double printing or blank printing. Therefore, in recent years, a sheet processing apparatus including an unauthorized supply detection device that confirms whether or not paper is being supplied accurately has been employed in a paper feeding unit in a printing press.

Japanese Patent No. 3913839 JP-A-2005-205630

  As a technique related to a sheet processing apparatus provided with an unauthorized supply detection device, for example, there is Patent Literature 1. This is because an ultrasonic sheet detection sensor and a photoelectric sheet detection sensor for detecting the presence / absence of a sheet are installed on the feeder board, and based on the detection result of the presence / absence of the sheet by the ultrasonic sheet detection sensor, It judges whether or not the detection result of the presence or absence of a sheet is appropriate, and warns the operator if there is a malfunction of the photoelectric sheet detection sensor. The sheet detection sensor as a sheet detector in the sheet processing apparatus It is a device that confirms suitability.

  According to this, it is detected by the sheet detection sensor whether there is a sheet conveyed from the paper feeding unit to the printing unit, and when there is no sheet, it is determined that the sheet supply is abnormal and the printing machine is stopped. . The two-sheet detection sensor detects whether or not the sheet conveyed from the sheet feeding unit to the printing unit is one sheet. If two or more sheets overlap, it is determined that the sheet supply is abnormal. And stop the press. Therefore, there is no possibility of sheet conveyance failure and damage to the device.

  However, the technique of Patent Document 1 is limited to a printing machine that continuously supplies (continuously supplies) sheets so that the case where one cylinder in the printing machine grips the sheet is repeated, and printing is performed from a paper feeding unit in the printing machine. There is a limitation on the sheet supply format to the department. An example of such a printing machine that is not continuously supplied is Patent Document 2. This is because the plate cylinder is formed in quadruple diameter with four printing surfaces, the rubber cylinder is formed in quadruple diameter with four printing surfaces, and the impression cylinder is formed in triple diameter with three printing surfaces. Printing press.

  According to this, since the impression cylinder has a triple diameter, the rubber cylinder and the plate cylinder have a quadruple diameter. Therefore, one printing surface of the impression cylinder is rotated by four revolutions of the impression cylinder. Touch one printing surface. Therefore, four types of printing with different colors and plates can be applied to one sheet.

  However, only one sheet has to be supplied in the paper feeding unit while the impression cylinder rotates four times in the printing unit. That is, it is a printing machine that intermittently supplies (intermittently supplies) a sheet so that one cylinder in the printing machine grips and does not grip the sheet.

  In such an intermittent supply printing machine, sheets are supplied at regular intervals. Therefore, in the case of intermittent supply, there may be a case where the sheet should be present at a predetermined timing when the sheet should be at a predetermined position in the case of continuous supply, and a case where it should not be. That is, even when there is no sheet at a predetermined position at a predetermined timing, there is a case where the operation of the printing press is not abnormal. When such a sheet should be absent, it is abnormal that the sheet is present. If the printing machine is continuously operated without being stopped, a paper jam or the like may occur and the device may be damaged. Therefore, a sheet processing apparatus such as that disclosed in Patent Document 1 cannot be employed in an intermittent supply printer such as that disclosed in Patent Document 2.

  SUMMARY An advantage of some aspects of the invention is that it is possible to correctly determine the presence or absence of a sheet at a predetermined position at a predetermined timing regardless of the sheet supply format.

  A sheet processing apparatus according to a first invention for solving the above-described problems is a sheet processing apparatus including a conveyance unit that conveys a sheet, and a supply unit that can continuously supply and intermittently supply the sheet to the conveyance unit. , A supply type detection unit for detecting whether the sheet supply type in the supply unit is continuous supply or intermittent supply, a sheet detector for detecting the presence or absence of a sheet at a predetermined position, and a sheet by the sheet detector A timing detector for measuring the sheet detection timing for detecting the presence or absence of the sheet, and a control unit for determining a sheet conveyance abnormality based on the detection result of the sheet detector detected at the sheet detection timing by the timing detector. When the control unit detects that the sheet supply format is continuous supply by the supply format detection unit, the timing detector At each timing of the sheet detection timing to be issued, it is determined that the presence of the sheet at the predetermined position is normal and the absence of the sheet is abnormal as the detection result of the sheet detector, and the sheet is detected by the supply type detection unit. When it is detected that the supply format is intermittent supply, the sheet detector detects that the sheet is present at the predetermined position of the sheet detection timing detected by the timing detector. When the sheet detection timing detected by the timing detector should not be present at the predetermined position, the sheet detector detects the sheet as a result of detection by the sheet detector. It is judged that the absence is normal and the presence of the sheet is abnormal

A sheet processing apparatus according to a second invention for solving the above-mentioned problems is the sheet processing apparatus according to the first invention, wherein a gripping section capable of gripping the transported sheet is provided downstream of the transport section in the transport direction of the sheet. In the case where one or more cylinders are provided and the sheets are continuously supplied, the sheets are continuously supplied so that the gripping section in the cylinder continuously holds the sheets, and the sheets are supplied intermittently. In the case, the sheet is intermittently supplied so that the gripping portion in the cylinder grips the sheet intermittently.
For example, when a gripper having one gripper device in the circumferential direction is used as a torso, in the continuous supply, the case where one gripper device provided in the circumferential direction of the barrel grips the sheet is repeated. In this way, one sheet is continuously supplied for each cycle of the cylinder, and in the intermittent supply, the case where one gripping claw device provided in the circumferential direction of the cylinder grips the sheet and the case where the sheet is not gripped are repeated. One sheet is intermittently supplied for every plurality of cycles of the cylinder.
In addition, when a gripper having a plurality of gripping claw devices in the circumferential direction is used as the torso, each gripping claw device among the plurality of gripping claw devices provided in the circumferential direction of the barrel in the continuous supply has a sheet. A plurality of sheets are continuously supplied during one cycle of the cylinder so as to grip, and in the intermittent supply, some of the plurality of holding claw devices provided in the circumferential direction of the cylinder grip the sheet. In order to prevent other gripper devices from gripping the sheet, one or more sheets less than the plurality of sheets are intermittently supplied during one cycle of the cylinder.

  A sheet processing apparatus according to a third invention for solving the above-mentioned problems is characterized in that the sheet processing apparatus according to the first or second invention is provided with a display unit for displaying that a conveyance abnormality has occurred.

  According to the sheet processing apparatus of the first invention, in the case where the sheets are continuously supplied, it is normal that the sheet is present at a predetermined position at each timing of the sheet detection timing, and it is abnormal that there is no sheet. In the case where the sheet is intermittently supplied, at the timing at which the sheet should be at a predetermined position among the sheet detection timings, it is assumed that the sheet is present at the predetermined position as normal and the absence of the sheet is abnormal. At a timing at which a sheet should not be in a predetermined position, it is normal that there is no sheet at a predetermined position, and it is abnormal that there is a sheet. It is possible to correctly determine whether the presence or absence of the sheet at the position is normal or abnormal. In addition, when detecting the presence or absence of a sheet at a predetermined position, control according to the supply format of continuous supply or intermittent supply of sheets is performed, so that the sheet at a predetermined position is detected at the same sheet detection timing regardless of the sheet supply format. Presence / absence can be determined correctly. That is, in the continuous supply and the intermittent supply, it is possible to detect the sheet conveyance abnormality at the sheet detection timing of the same cycle without changing the setting of the timing detector.

  According to the sheet processing apparatus according to the second aspect of the present invention, a drum having one or more gripping portions capable of gripping the transported sheet is provided on the downstream side in the transport direction of the sheet in the transport portion, and the sheets are continuously supplied. In some cases, the sheet is continuously supplied so that the case where the holding unit in the cylinder holds the sheet is repeated, and when the sheet is intermittently supplied, the case where the cylinder holds the sheet and the case where the sheet does not hold are repeated. Thus, the sheet can be supplied intermittently, so that it can be employed in various printing machines, for example. When used in a printing press, it is possible to correctly determine abnormal sheet conveyance regardless of the sheet supply format. In this apparatus, the sheet can be prevented from clogging or empty printing. In addition, the cylinder installed downstream of the sheet processing apparatus and the sheet conveyance direction, and the cylinder installed downstream of the sheet processing apparatus and the sheet conveyance direction before causing other sheets to be clogged or blank printed In addition, by controlling other equipment linked to the cylinder, the sheet processing apparatus and the cylinder installed downstream in the sheet conveyance direction and other equipment linked to the cylinder are clogged, and the sheet is removed and the damage is confirmed. In addition, since no repair or the like occurs, the operating efficiency of the printing press can be improved.

  According to the sheet processing apparatus of the third invention, when the sheet processing apparatus is controlled and the result of the control content is displayed on the display unit, the worker can know about the control of the sheet processing apparatus. It is possible to respond quickly and improve the operating efficiency of the sheet processing apparatus and the like. Further, if details about the control contents of the sheet processing apparatus are displayed on the display unit, the worker can respond more quickly, so that the operating efficiency of the sheet processing apparatus and the like can be further improved. .

1 is an overall schematic diagram illustrating a sheet printing machine including a sheet processing apparatus according to Embodiment 1. FIG. FIG. 6 is an explanatory diagram illustrating a continuous supply state of sheets in the sheet processing apparatus according to the first embodiment. 6 is an explanatory diagram illustrating an intermittent supply state of sheets in the sheet processing apparatus according to Embodiment 1. FIG. 6 is an explanatory diagram illustrating an intermittent supply state of sheets in the sheet processing apparatus according to Embodiment 1. FIG. FIG. 3 is a control block diagram in the sheet processing apparatus according to the first embodiment. 6 is a control flowchart in the sheet processing apparatus according to the first embodiment.

  Hereinafter, embodiments of a sheet processing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the sheet processing apparatus according to the present invention is employed in a sheet printer that performs digital printing. Needless to say, the present invention is not limited to the following examples, and various modifications can be made without departing from the spirit of the present invention.

  The configuration of the sheet printer according to the present embodiment will be described with reference to FIG.

  Sheets 1 to be printed are stacked on a sheet feeding table 21, and a sucker device 22 is installed above them. The sucker device 22 has a mechanism for sucking up the sheets 1 on the sheet feeding table 21 one by one and sending them to the feeder board 23. The feeder board 23 on which the sheet 1 fed by the sucker device 22 is placed and conveyed to the vicinity of the printing unit is downstream of the uppermost part of the sheet 1 loaded on the sheet feed table 21 (left side in FIG. 1). It is installed close to. The feeder board 23 is provided with a front pad 23a and a register device (not shown). The sheet 1 is positioned at a predetermined position by the front pad 23a and a registration device (not shown) such that the sheet 1 is prevented from being conveyed by the front pad 23a protruding on the upper surface (front surface) of the feeder board 23.

  Further, on the other end side of the feeder board 23, a sheet detection sensor 100 (see FIGS. 2 to 3B) for detecting the presence or absence of the sheet 1 positioned at a predetermined position on the feeder board 23 by the front pad 23a and the registering device. is set up. In this embodiment, as the sheet detection sensor 100, a reflective photoelectric sensor that detects the presence or absence of a detection object by receiving light reflected by the projected light on the detection object is employed. Of course, a transmissive photoelectric sensor or an ultrasonic sensor may be adopted as long as it can detect the presence or absence of a detection target.

  The sheet detection sensor 100 will be described later so as to detect the presence / absence of the sheet 1 at the sheet detection timing for detecting the presence / absence of the sheet 1 obtained by a timing detection encoder 101 (see FIG. 4) as a timing detector described later. It is controlled by the control unit 110.

  In the vicinity of the other end of the feeder board 23, it is a single diameter having a set of gripping claw devices 31a which are gripping portions for detachably gripping the upstream end portion (one end portion) of the sheet 1 in the conveyance direction. A first transfer drum 31 is installed. A swing device 24 is provided between the feeder board 23 and the first transfer cylinder 31 for transferring the sheet 1 on the feeder board 23 to the first transfer cylinder 31. The swing device 24 has a swing claw (not shown) that detachably grips an upstream end (one end) of the sheet 1 positioned in a predetermined position on the feeder board 23 in the conveyance direction.

  The feeder board 23 is provided with a front contact driving device 124 made of an air cylinder or the like (not shown) for bringing the front contact 23 a into the lower surface of the feeder board 23. The front pad 23 a falls down on the lower surface (back surface) of the feeder board 23 by the front pad driving device 124 after positioning the seat 1. As a result, the sheet 1 is not blocked by the front pad 23 a and is conveyed to the first transfer drum 31 by the swing device 24.

  The first transfer cylinder 31 is a printing cylinder 32 having a triple diameter having three sets of gripping claw devices 32a that are detachably gripping an upstream end (one end) of the sheet 1 in the conveyance direction. Are installed facing each other. The drive motor 120 (see FIG. 4) of the printing cylinder 32 is provided with a timing detection encoder 101 (see FIG. 4) that detects the phase of the printing cylinder 32.

  An inkjet digital printing device 33 is installed on the downstream side in the rotational direction (the conveyance direction of the sheet 1) from the position where the printing cylinder 32 is in contact with the first transfer cylinder 31 so as to face the outer peripheral surface of the printing cylinder 32. ing. The digital printing apparatus 33 can digitally print a plurality of colors (four colors in this embodiment) on the outer surface of the sheet 1 held on the outer peripheral surface of the printing cylinder 32 by an inkjet method. ing.

  An ink drying device 34 is installed on the downstream side in the rotation direction (the conveyance direction of the sheet 1) of the printing cylinder 32 from the position facing the digital printing apparatus 33 so as to face the outer peripheral surface of the printing cylinder 32. The ink drying device 34 can dry ink digitally printed on the outer surface of the sheet 1 held on the outer peripheral surface of the printing cylinder 32.

  An upstream end (one end) in the transport direction of the sheet 1 is detachably gripped downstream of the printing cylinder 32 in the rotation direction (the transport direction of the sheet 1) from the position facing the ink drying device 34. A second transfer cylinder 35 having a single diameter and having a pair of gripping claw devices 35a that are gripping portions to be held is installed in contact with each other. The second transfer drum 35 has a single diameter having a pair of gripping claw devices 36a which are gripping portions for detachably gripping the upstream end portion (one end portion) of the sheet 1 in the conveyance direction. Three transfer drums 36 are installed in contact with each other.

  The third transfer drum 36 is a paper having a single diameter having a pair of gripping claw devices 41a which are detachable grips for the upstream end (one end) of the sheet 1 in the transport direction. A take-up drum 41 is installed in contact. The paper take-up cylinder 41 communicates with the upstream side in the traveling direction of the discharge belt 42 that receives and conveys the sheet 1 from the paper take-up cylinder 41 (the conveyance direction of the sheet 1). The downstream side of the discharge belt 42 in the traveling direction (the conveyance direction of the sheet 1) is located on the sheet discharge table 43 on which the sheets 1 are stacked.

  An end (one end) on the upstream side in the conveyance direction of the sheet 1 is provided downstream of the position where the third transfer cylinder 36 is in contact with the paper drum 41 in the rotation direction (the conveyance direction of the sheet 1). A pre-reversing double cylinder 51 having a double diameter having a pair of gripping claw devices 51a that are detachably gripped gripping parts is installed in contact therewith. The pre-inversion double cylinder 51 is installed in the vicinity of the printing cylinder 32, and the sheet 1 on the pre-inversion double cylinder 51 is transferred to the printing cylinder 32 between the pre-inversion double cylinder 51 and the printing cylinder 32. A reversing swing device 52 is installed.

  In this embodiment, the sheet feeding base 21 and the sucker device 22 constitute a supply unit, the feeder board 23 and the swing device 24 constitute a conveyance unit, and the supply unit, the conveyance unit, and the like serve as sheet supply means. The sheet processing unit 20 as a processing apparatus is configured, and the first transfer cylinder 31, the printing cylinder 32, the digital printing apparatus 33, the ink drying apparatus 34, the second transfer cylinder 35, the third transfer cylinder 36, etc. are used as digital printing means. A digital printing unit 30 is configured, and a sheet discharging unit 40 as a sheet discharging unit as a discharging unit is configured by a paper removing cylinder 41, a discharging belt 42, a discharging table 43, and the like. 52 or the like constitutes a sheet reversing unit 50 which is a sheet reversing means, and includes a sheet processing unit 20, a digital printing unit 30, a sheet discharging unit 40, It constitutes a sheet printing machine 10 by over preparative reversing unit 50 or the like.

  In addition, the sheet printer 10 according to the present embodiment is provided with a display unit 121 for reporting an error to an operator or the like when an error such as an abnormal conveyance of the sheet 1 occurs, and conveying the sheet 1. Various mechanisms for stopping the above are provided. Note that when an error such as a conveyance error of the sheet 1 occurs, the display unit 121 for reporting the error to the worker or the like displays, for example, that the conveyance abnormality has occurred and notifies the worker or the like. There are monitors, alarm devices that can inform workers and the like by sounding a warning sound that a conveyance error has occurred.

  The sheet processing unit 20 is connected to the drive motor 120 via the feeder clutch 122 and is operated by the drive motor 120. Thus, even if the drive motor 120 is not stopped, the drive transmission of the drive motor 120 is cut off by disconnecting the feeder clutch 122, so that the operation of the sheet processing unit 20 can be stopped.

  The swing device 24 in the sheet processing unit 20 is detachably held by a cam by a swing claw opening / closing cam follower attaching / detaching device 123 including a cam (not shown) for opening and closing a swing claw (not shown) and an air cylinder (not shown). With no cam followers. When the sheet detection sensor 100 detects an error (such as conveyance abnormality), the swing claw opening / closing cam follower attaching / detaching device 123 retracts the cam follower (not shown) from the cam (not shown) and stops with the swing claw (not shown) opened. Thereby, since the swing device 24 cannot grip the sheet 1, the conveyance of the sheet 1 from the feeder board 23 to the first transfer drum 31 can be stopped.

  As described above, the feeder board 23 in the sheet processing unit 20 includes the front contact driving device 124 formed of an air cylinder or the like (not shown) for bringing the front contact 23a into the lower surface (back surface) of the feeder board 23. When the sheet detection sensor 100 detects an error (such as a conveyance error), the front contact driving device 124 stops with the front contact 23 a protruding from the upper surface (front surface) of the feeder board 23. Thereby, since conveyance of the sheet 1 is hindered by the front pad 23a, conveyance of the sheet 1 from the feeder board 23 to the first transfer cylinder 31 can be stopped.

  The operation of the sheet printer 10 according to this embodiment will be described with reference to FIG. The operation of the sheet printer 10 according to the present embodiment includes continuous supply single-sided printing and intermittent supply double-sided printing with different supply formats. The worker selects either single-sided printing or double-sided printing by the supply format detection unit 102 (see FIG. 4).

  In single-sided printing, printing is performed only on one side of the sheet 1 (the upper surface in a stacked state). Single-sided printing in the sheet printer 10 according to the present embodiment is performed by continuously supplying the sheet 1. The continuous supply is to continuously supply the sheet 1 so that the gripper device 32a in the printing cylinder 32 continuously holds the sheet 1, and the sheet 1 that can be held by the cylinder in the sheet printer 10 at a time. The maximum number of sheets (in this embodiment, three sheets because the printing cylinder 32 has a triple diameter) is continuously supplied during one period of the cylinder. That is, in the continuous supply, the case where the sheet 1 is supplied from the first transfer cylinder 31 and is gripped by the gripping claw device 32a of the printing cylinder 32 is repeated in the printing cylinder 32 provided with the three gripping claw devices 32a. The single-sided printing operation is as follows.

  When the sheets 1 on the sheet feeding table 21 are fed one by one onto the feeder board 23 by the sucker device 22 in the sheet processing unit 20, the sheet 1 is placed at a predetermined position on the feeder board 23 by the front pad 23a and a register device (not shown). Position to. When the front pad 23a falls on the lower surface of the feeder board 23 by the front pad driving device 124, the front pad 23a does not hinder the conveyance of the sheet 1, and the first transfer cylinder 31 is formed from above the feeder board 23 of the sheet 1 by the swing device 24. Can be transported to. The swing device 24 causes the first claw device 31a of the first transfer cylinder 31 in the sheet printing unit 30 to hold the first end of the sheet 1 in the conveyance direction upstream (end on one side) from above the feeder board 23. Deliver the sheet 1 to the trunk 31.

  An upstream end (one end) in the conveying direction is held by the gripping claw device 31a of the first transfer drum 31 and held on the outer peripheral surface of the first transfer drum 31. The portion (one end portion) is held on the outer peripheral surface of the printing cylinder 32 by being held and replaced by the holding claw device 32a of the printing cylinder 32.

  The sheet 1 held on the outer peripheral surface of the printing cylinder 32 by gripping the upstream end (one direction end) in the conveying direction by the gripping claw device 32 a of the printing cylinder 32 is placed on the outer surface ( One side) is digitally printed in batch with a plurality of colors (four colors in this embodiment) by an ink jet method, and after the ink on the outer side (one side) is dried by the ink drying device 34, the upstream side in the transport direction The side end (one side end) is replaced with a gripping claw device 35 a of the second transfer drum 35.

  The sheet 1 held on the outer peripheral surface of the second transfer drum 35 with the end (one end) on the upstream side in the transfer direction being held by the holding claw device 35a of the second transfer drum 35 is upstream of the transfer direction. The side end (one end) is gripped by the gripping claw device 36a of the third transfer drum 36 and replaced.

  The sheet 1 held on the outer peripheral surface of the third transfer drum 36 with the end (one end) on the upstream side in the transfer direction being held by the holding claw device 36a of the third transfer drum 36 is upstream of the transfer direction. The side end (one side end) is held by the gripping claw device 41a of the paper take-up drum 41 and held and held on the outer peripheral surface of the paper take-up drum 41.

  The sheet 1 held on the outer peripheral surface of the paper take-up drum 41 with the end (one end) on the upstream side in the conveying direction held by the gripping claw device 41a of the paper take-up drum 41 is transferred to the discharge belt 42. The paper is discharged onto the paper discharge tray 43. As described above, single-sided printing of the sheet 1 is performed in the sheet printer 10 according to the present embodiment.

  In double-sided printing, printing is performed on both sides of the sheet 1. Double-sided printing in the sheet printer 10 according to the present embodiment is performed by intermittently supplying the sheet 1. The intermittent supply is to supply the sheet 1 intermittently so that the gripper device 32a in the printing cylinder 32 intermittently holds the sheet 1, and the sheet 1 in which the cylinder in the sheet printer 10 can be held at a time. Less than the maximum number of sheets (in this embodiment, three because the printing cylinder 32 has a triple diameter), the number of sheets is intermittent (in this embodiment, one for continuous supply). This means that it is supplied to the stack. That is, in the intermittent supply, in the printing cylinder 32 provided with the three gripping nail devices 32a, the sheet 1 is supplied from the first transfer cylinder 31 and is gripped by the gripping nail device 32a of the printing cylinder 32, and the sheet 1 Is repeated without being supplied from the first transfer cylinder 31 (without being conveyed from the first transfer cylinder 31) and held by the gripper device 32a of the printing cylinder 32. The operation of duplex printing is as follows.

  When the sheets 1 on the sheet feeding table 21 are fed one by one onto the feeder board 23 by the sucker device 22 in the sheet processing unit 20, the sheet 1 is placed at a predetermined position on the feeder board 23 by the front pad 23a and a register device (not shown). Position to. When the front pad 23a falls on the lower surface of the feeder board 23 by the front pad driving device 124, the front pad 23a does not hinder the conveyance of the sheet 1, and the first transfer cylinder 31 is formed from above the feeder board 23 of the sheet 1 by the swing device 24. Can be transported to. The swing device 24 causes the first claw device 31a of the first transfer cylinder 31 in the sheet printing unit 30 to hold the first end of the sheet 1 in the conveyance direction upstream (end on one side) from above the feeder board 23. Deliver the sheet 1 to the trunk 31.

  An upstream end (one end) in the conveying direction is held by the gripping claw device 31a of the first transfer drum 31 and held on the outer peripheral surface of the first transfer drum 31. The portion (one end portion) is held on the outer peripheral surface of the printing cylinder 32 by being held and replaced by the holding claw device 32a of the printing cylinder 32.

  The sheet 1 held on the outer peripheral surface of the printing cylinder 32 with the end (one end) on the upstream side in the conveying direction held by the gripping claw device 32a of the printing cylinder 32 is transferred to the outer surface by the digital printing apparatus 33. (One side) is digitally printed in batch with a plurality of colors (four colors in this embodiment) by an ink jet method, and after the ink on the outer side (one side) is dried by the ink drying device 34, the transport direction The upstream end portion (one end portion) is replaced with a holding claw device 35 a of the second transfer drum 35.

  The sheet 1 held on the outer peripheral surface of the second transfer drum 35 with the end (one end) on the upstream side in the transfer direction being held by the holding claw device 35a of the second transfer drum 35 is upstream of the transfer direction. The side end (one end) is gripped by the gripping claw device 36a of the third transfer drum 36 and replaced.

  The sheet 1 held on the outer peripheral surface of the third transfer drum 36 by holding the end (one end) on the upstream side in the conveying direction by the holding claw device 36a of the third transfer drum 36 is Passing through the contact position between the transfer cylinder 36 and the paper take-up cylinder 41 as it is, the end on the upstream side in the conveying direction (the end on the one side) is the gripping claw device 51a of the double cylinder 51 before reversing in the sheet reversing unit 50. Is held and replaced.

  The sheet 1 held on the outer circumferential surface of the pre-reversal double cylinder 51 by gripping the upstream end (one end) of the conveyance direction upstream cylinder 51 by the holding claw device 51a of the pre-reverse double cylinder 51 When the end (the other end) reaches the vicinity of the contact position between the pre-reverse double cylinder 51 and the printing cylinder 32, the reverse swing device 52 moves downstream of the sheet 1 in the conveying direction of the sheet nail device 32 a of the printing cylinder 32. The sheet is transferred so as to hold the end portion on the side (the end portion on the other side), and the double cylinder 51 before reversal releases the sheet 1 from being held by the holding claw device 51a.

  As a result, the end portion (the other end portion) of the sheet 1 that has been positioned on the downstream side in the transport direction is newly positioned on the upstream side in the transport direction by the reverse swing device 52. That is, the end portion (one end portion) located on the upstream side in the transport direction and the end portion (end portion on the other side) located on the downstream side in the transport direction are reversed, and the pre-reverse double cylinder The front and back surfaces are reversed by being held on the outer peripheral surface of the printing cylinder 32 so that the outer surface (one surface) when it is held on the outer peripheral surface of 51 is positioned on the outer side as it is (conventional technology). Therefore, a detailed description of the reversing mechanism is omitted).

  In this way, the sheet 1 in which the end portion (the other end portion) newly positioned on the upstream side in the conveyance direction is held by the gripping claw device 32a of the printing cylinder 32 is held on the outer peripheral surface of the printing cylinder 32. .

  At this time, the end (one end) on the upstream side in the transport direction from the outer peripheral surface of the first transfer cylinder 31 is held by the gripper device 32a of the printing cylinder 32 and held on the outer peripheral surface of the printing cylinder 32. The sheet 1 and the reverse swing device 52 grip the end (the other end) on the downstream side in the transport direction from the outer peripheral surface of the pre-reverse double cylinder 51 by the gripping claw device 32a of the print cylinder 32, and the outer periphery of the print cylinder 32 The sheets 1 held on the surface are alternately held on the outer peripheral surface of the printing cylinder 32 in the transport direction. Therefore, in the double-sided printing by the sheet printer 10 according to the present embodiment, the sheet processing apparatus 20 needs to perform the intermittent supply of the sheet 1 as described above.

  The sheet 1, which is held on the outer peripheral surface of the printing cylinder 32 with the end (the other end) on the upstream side in the conveying direction held by the gripping claw device 32 a of the printing cylinder 32, The other side is digitally printed in batch with a plurality of colors (four colors in this embodiment) by an ink jet method, and after the ink on the outer side (the other side) is dried by the ink drying device 34, the transport direction The upstream end portion (the other end portion) is replaced with the holding claw device 35 a of the second transfer drum 35.

  The sheet 1 held on the outer peripheral surface of the second transfer drum 35 with the end (the other end) on the upstream side in the transfer direction being held by the holding claw device 35a of the second transfer drum 35 is upstream of the transfer direction. The side end portion (the other end portion) is gripped by the gripping claw device 36a of the third transfer drum 36 and replaced.

  The sheet 1 held on the outer peripheral surface of the third transfer drum 36 with the end (the other end) on the upstream side in the transfer direction being held by the holding claw device 36a of the third transfer drum 36 is upstream of the transfer direction. The side end portion (the other end portion) is held by the gripping claw device 41 a of the paper take-up drum 41 and held on the outer peripheral surface of the paper take-up drum 41.

  The sheet 1 held on the outer peripheral surface of the paper take-up drum 41 with the end on the upstream side in the transport direction (the other end) held by the gripping claw device 41a of the paper take-up drum 41 is delivered to the discharge belt 42. The paper is discharged onto the paper discharge tray 43. As described above, double-sided printing of the sheet 1 is performed in the sheet printer 10 according to the present embodiment.

  Control in the sheet printer 10 according to the present embodiment will be described with reference to FIGS. 4 and 5.

  As shown in FIG. 4, in the sheet printer 10 according to the present embodiment, the sheet detection sensor 100 at a predetermined position at a predetermined position based on detection signals from the timing detection encoder 101 and the supply format detection unit 102. The presence or absence of the sheet 1 is detected, and the control unit 110 controls the operation of the feeder clutch 122, the front drive device 124, the swinging claw opening / closing cam follower attaching / detaching device 123, the drive motor 120, and the display unit according to the detection result. An error display in 121, that is, a display of occurrence of a conveyance abnormality is performed.

  The flow of control in single-sided printing, which is continuous supply, is as follows.

  As shown in FIG. 5, in step S <b> 1, the control unit 110 determines whether the supply format is continuous supply for single-sided printing or intermittent supply for double-sided printing based on the detection result of the supply format detection unit 102. In the sheet printer 10 according to the present embodiment, the worker selects either single-sided printing or double-sided printing in the supply format detection unit 102.

  In step S1, if the control unit 110 determines that the supply format is continuous supply (N) based on the detection result of the supply format detection unit 102, the control unit 110 prints based on the detection result of the timing detection encoder 101 in step S2. It is determined whether the phase of the cylinder 32 is a predetermined phase (a phase with a sheet). In the sheet printer 10 according to the present embodiment, the phase of the printing cylinder 32 is detected by the timing detection encoder 101 provided on the printing cylinder 32, and the control unit 110 compares the phase with a predetermined phase (sheet phase).

  On the other hand, when the control unit 110 determines in step S1 that the supply format is intermittent supply (Y) based on the detection result of the supply format detection unit 102, the process proceeds to step S5. The flow of control in double-sided printing that is intermittent supply will be described later.

  In step S <b> 2, the phase of the printing cylinder 32 is a predetermined phase (sheet phase) based on the detection result of the timing detection encoder 101 by the control unit 110, that is, a predetermined timing (sheet detection timing) that the sheet 1 should be. If it is determined (Y), in step S3, as shown in FIG. 2, the control unit 110 causes the sheet detection sensor 100 to detect the presence or absence of the sheet 1, and determines the detection result of the sheet detection sensor 100.

  If the control unit 110 determines in step S3 that the sheet 1 is surely present (Y) based on the detection result of the sheet detection sensor 100, the flow of the sheet 1 is normal, and the process returns to step S2.

  On the other hand, if the control unit 110 determines that there is no sheet 1 (N) based on the detection result of the sheet detection sensor 100 in step S3, the flow of the sheet 1 is abnormal. Stop printing. That is, in step S4, the control unit 110 displays an error on the display unit 121, that is, the occurrence of a conveyance abnormality, disconnects the feeder clutch 122, stops driving transmission of the driving motor 120, stops the sheet processing unit 20, and swings. The claw opening / closing cam follower attaching / detaching device 123 is operated by an air cylinder or the like (not shown), the cam follower (not shown) is retracted from the cam (not shown), the swing claw (not shown) of the swing device 24 is released, and the holding of the seat 1 is stopped, and the front drive is performed. The apparatus 124 is operated by an air cylinder or the like (not shown) to prevent the front pad 23a from falling down and prevent the sheet 1 from being conveyed, so that the new sheet 1 is not conveyed from the feeder board 23 to the first transfer cylinder 31, Detection sensor 100 detects abnormality After all of the sheet 1 which has been transported by the transport direction downstream side of the first transfer cylinder 31 and the first transfer cylinder 31 is discharged after printing when to stop the driving motor 120.

  If it is determined in step S2 that the phase of the printing cylinder 32 is not the predetermined phase (phase with sheet), that is, it is not the predetermined timing (sheet detection timing) that the sheet 1 should be (N), step S2 Return to.

  Control of double-sided printing, which is intermittent supply, is as follows.

  As shown in FIG. 5, in step S <b> 1, the control unit 110 determines whether the supply format is continuous supply for single-sided printing or intermittent supply for double-sided printing based on the detection result of the supply format detection unit 102. In the sheet printer 10 according to the present embodiment, the worker selects either single-sided printing or double-sided printing in the supply format detection unit 102.

  If the control unit 110 determines in step 1 that the supply format is intermittent supply (Y) based on the detection result of the supply format detection unit 102, the control unit 110 prints based on the detection result of the timing detection encoder 101 in step S5. It is determined whether the phase of the cylinder 32 is a predetermined phase (sheet phase). In the sheet printer 10 according to the present embodiment, the timing detection encoder 101 provided in the printing cylinder 32 detects the phase of the printing cylinder 32, and the control unit 110 compares it with a predetermined phase (phase with sheet). .

  On the other hand, when the control unit 110 determines in step S1 that the supply format is continuous supply (N) based on the detection result of the supply format detection unit 102, the process proceeds to step S2. The flow of control in single-sided printing, which is continuous supply, is as described above.

  In step S <b> 5, the phase of the printing cylinder 32 is a predetermined phase (phase with sheet) based on the detection result of the timing detection encoder 101, that is, the timing at which the sheet 1 should be present in the sheet detection timing (Y In step S6, as shown in FIG. 3A, the control unit 110 causes the sheet detection sensor 100 to detect the presence or absence of the sheet 1 and determines the detection result of the sheet detection sensor 100.

  If the control unit 110 determines in step S6 that the sheet 1 is surely present (Y) based on the detection result of the sheet detection sensor 100, the flow of the sheet 1 is normal, and the process returns to step S5.

  When the control unit 110 determines that there is no sheet 1 (N) based on the detection result of the sheet detection sensor 100 in step S <b> 6, the flow of the sheet 1 is abnormal, so the control unit 110 performs printing in the sheet printer 10. Stop. That is, in step S7, the control unit 110 displays an error on the display unit 121, that is, the occurrence of a conveyance abnormality, and also disconnects the feeder clutch 122 to stop driving transmission of the driving motor 120, stops the sheet processing unit 20, and swings. The claw opening / closing cam follower attaching / detaching device 123 is operated by an air cylinder or the like (not shown), the cam follower (not shown) is retracted from the cam (not shown), the swing claw (not shown) of the swing device 24 is released, and the holding of the seat 1 is stopped, and the front drive is performed. The apparatus 124 is operated by an air cylinder or the like (not shown) to prevent the front pad 23a from falling down and prevent the sheet 1 from being conveyed, so that the new sheet 1 is not conveyed from the feeder board 23 to the first transfer cylinder 31, Detection sensor 100 detects abnormality After all of the sheet 1 which has been transported by the transport direction downstream side of the first transfer cylinder 31 and the first transfer cylinder 31 is discharged after printing when to stop the driving motor 120.

  In step S <b> 5, the phase of the printing cylinder 32 is not a predetermined phase (phase with sheet) based on the detection result of the timing detection encoder 101 in the step S <b> 5. In step S8, the control unit 110 determines whether the phase of the printing cylinder 32 is a predetermined phase (no sheet phase) based on the detection result of the timing detection encoder 101. In the sheet printing machine 10 according to the present embodiment, the timing detection encoder 101 provided on the printing cylinder 32 detects the phase of the printing cylinder 32, and the control unit 110 compares the phase with a predetermined phase (sheet non-phase). .

  In step S <b> 8, the control unit 110 determines that the phase of the printing cylinder 32 is a predetermined phase (sheet no phase) based on the detection result of the timing detection encoder 101, that is, the sheet 1 should not be present in the sheet detection timing. If it is determined that the timing is (Y), in step S9, as shown in FIG. 3B, the controller 110 causes the sheet detection sensor 100 to detect the presence or absence of the sheet 1, and the detection result of the sheet detection sensor 100 is detected. Judging.

  If the control unit 110 determines in step S9 that the sheet 1 is surely absent (N) based on the detection result of the sheet detection sensor 100, the flow of the sheet 1 is normal, and the process returns to step S5.

  On the other hand, if the control unit 110 determines in step S9 that the sheet 1 is present (Y) based on the detection result of the sheet detection sensor 100, the flow of the sheet 1 is abnormal, and thus the control unit 110 in the sheet printer 10 Stop printing. In other words, in step S10, the control unit 110 displays an error on the display unit 121, that is, an occurrence of conveyance abnormality, and also disconnects the feeder clutch 122 to stop driving transmission of the driving motor 120, stops the sheet processing unit 20, and swings. The claw opening / closing cam follower attaching / detaching device 123 is operated by an air cylinder or the like (not shown), the cam follower (not shown) is retracted from the cam (not shown), the swing claw (not shown) of the swing device 24 is released, and the holding of the seat 1 is stopped, and the front drive is performed. The apparatus 124 is operated by an air cylinder or the like (not shown) to prevent the front pad 23a from falling down and prevent the sheet 1 from being conveyed, so that the new sheet 1 is not conveyed from the feeder board 23 to the first transfer cylinder 31, The detection sensor 100 After the first transfer cylinder 31 and all sheets 1 have been transported by the transport direction downstream side of the first transfer cylinder 31 is discharged after printing when issued, to stop the driving motor 120.

  In step S <b> 8, the phase of the printing cylinder 32 is not a predetermined phase (sheet no phase) based on the detection result of the timing detection encoder 101, that is, the sheet 1 should not be present in the sheet detection timing. If it is determined that the timing is not (N), the process returns to step S5.

  In this way, in this embodiment, when detecting the presence or absence of the sheet 1 at a predetermined position, the control is performed according to the supply format of continuous supply or intermittent supply of the sheet 1, and therefore the same regardless of the supply format of the sheet 1. The presence or absence of the sheet 1 at a predetermined position can be correctly determined at the sheet detection timing. That is, in the continuous supply and the intermittent supply, it is possible to detect the conveyance abnormality of the sheet 1 at the sheet detection timing of the same cycle without changing the setting of the timing detection encoder 101 and the like.

In this embodiment, a printing cylinder 32 having three gripper devices 32a as gripping portions in the circumferential direction is used, and in the continuous supply, the three gripping device 32a provided in the circumferential direction of the printing cylinder 32 are used. Among these, three grips 1 are continuously fed during one cycle of the printing cylinder 32 so that each gripping device 32 a grips the sheet 1, and three grips provided in the circumferential direction of the printing cylinder 32 in intermittent feeding. One or two sheets 1 of the nail device 32a are held in one period of the printing cylinder 32 so that some gripper devices 32a grip the sheet 1 and other gripper devices 32a do not grip the sheet 1. It was supplied intermittently.
Of course, the present invention is not limited to this, and the printing cylinder 32 may have one or more gripper devices 32a as a gripping portion in the circumferential direction.
For example, a printing cylinder having one gripper device as a gripping portion in the circumferential direction is used, and in continuous feeding, the case where one gripping device provided in the circumferential direction of the printing cylinder grips a sheet is repeated. One sheet is continuously supplied for every period of the printing cylinder, and in the intermittent supply, one gripper device provided in the circumferential direction of the printing cylinder repeats the case of holding the sheet and the case of not holding the sheet. One sheet may be intermittently supplied every plural cycles of the printing cylinder.

DESCRIPTION OF SYMBOLS 1 Sheet 10 Sheet printing machine 20 Sheet processing unit 21 Feeding base 22 Sucker device 23 Feeder board 23a Front pad 24 Swing device 30 Digital printing unit 31 First transfer cylinder 31a First transfer cylinder holding claw device 32 Printing cylinder 32a Printing cylinder holding Nail device 33 Digital printing device 34 Ink drying device 35 Second transfer cylinder 35a Second transfer cylinder gripping device 36 Third transfer cylinder 36a Third transfer cylinder gripping device 40 Sheet discharge unit 41 Paper cylinder 41a Paper take-up cylinder gripping device 42 Discharge belt 43 Discharge stand 50 Sheet reversing unit 51 Pre-reversal double cylinder 51a Reverse-front double gripper claw device 52 Reverse swing device 100 Sheet detection sensor 101 Timing detection encoder 102 Supply type detection unit 110 control unit 120 drive motor 121 display unit 122 feeder Pitch 123 swing claw opening and closing cam followers detaching device 124 front lay drive

Claims (3)

A sheet processing apparatus comprising a conveyance unit that conveys a sheet, and a supply unit that can continuously and intermittently supply the sheet to the conveyance unit,
A supply type detection unit that detects whether the supply type of the sheet in the supply unit is continuous supply or intermittent supply; a sheet detector that detects the presence or absence of a sheet at a predetermined position; and a sheet detection by the sheet detector A timing detector for measuring the sheet detection timing for detecting presence or absence, and a control unit for determining a sheet conveyance abnormality based on a detection result of the sheet detector detected at the sheet detection timing by the timing detector. ,
The controller is
When the sheet supply format is detected by the supply format detection unit, the sheet is detected at the predetermined position as the detection result of the sheet detector at each timing of the sheet detection timing detected by the timing detector. Is judged to be normal, and the absence of a seat is considered abnormal.
When the sheet supply type is detected as intermittent supply by the supply type detection unit, the sheet detector detects the sheet at the predetermined position among the sheet detection timings detected by the timing detector. As a result, it is determined that the presence of a sheet is normal and the absence of a sheet is abnormal, and the sheet detection is performed at a timing at which the sheet should not be present at the predetermined position among the sheet detection timings detected by the timing detector. A sheet processing apparatus characterized in that it is determined that there is no sheet as normal and the presence of a sheet is abnormal as a detection result of the container. A cylinder having one or more gripping portions capable of gripping the transported sheet is provided on the downstream side in the transport direction of the sheet in the transporting portion,
In the case where the sheet is continuously supplied, the sheet is continuously supplied so that the grip portion in the cylinder continuously grips the sheet,
2. The sheet processing apparatus according to claim 1, wherein when the sheet is intermittently supplied, the sheet is intermittently supplied so that the gripping portion in the cylinder intermittently grips the sheet.   The sheet processing apparatus according to claim 1, further comprising a display unit that displays that a conveyance abnormality has occurred.

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