JP2013199370A - Sheet feeding unit of printing machine, printing machine and sheet feeding method of printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding unit of a printing machine, the printing machine and a sheet feeding method of the printing machine which can prevent the occurrence of troubles such as displacement and skew of a sheet delivered from an accumulating unit to a feeder board, and which can reduce load of an operator and obtain satisfactory print quality.SOLUTION: Sheet feeding sections 10 and 10a of a printing machine includes: an accumulating unit 12 in which sheets are accumulated in a stacked state; a feeder board 14 to which the sheets are delivered from the accumulating unit 12; and a sheet delivering mechanism 18 which delivers the sheets from the accumulating unit 12 to the feeder board 14. An adsorption mechanism 29 which adsorbs the sheets delivered from the accumulating unit 12 to the feeder boarder 14 by the sheet delivering mechanism 18 is provided at the feeder board 14.

Description

  The present invention relates to a paper feeding unit of a printing machine, a printing machine, and a paper feeding method of the printing machine.

  As the sheet-fed printing machine, a stream feeder method is adopted in which stacked sheets are separated one by one in order from the top and continuously conveyed (see, for example, Patent Documents 1 and 2). As a conventional sheet-fed printing press, one having a configuration as shown in FIG. 1 is generally used. As shown in FIG. 1, the sheet-fed printing press includes a paper feed unit (feeder unit) 40, a printing unit unit 50, and a paper discharge unit (delivery unit) 60. In such a sheet-fed printing press, paper is supplied from the paper supply unit 40 to the printing unit unit 50, printing is performed on the paper by the printing unit unit 50, and the paper printed by the printing unit unit 50 is sent to the paper discharge unit 60. The paper is conveyed and stacked on the paper discharge unit 60.

  In the paper feed unit 40, the paper is stacked in a stacked state on the feeder pile board (stacking unit) 12, and the paper is sent from the feeder pile board 12 to the feeder board 14. Further, the paper feeding unit 40 is provided with a soccer unit 16, and the soccer unit 16 separates the sheets one by one. The paper feeding unit 40 is provided with a paper feeding mechanism 18 that feeds paper from the feeder pile board 12 to the feeder board 14.

  The printing unit section 50 is provided with an inking section 51 provided with an ink fountain 51a, a dampening water (dampening) section 52, a plate cylinder 53, a bracket cylinder 54, an impression cylinder 55, a paper transfer cylinder 56, and the like. Yes. The printing unit section 50 is also provided with a bracket automatic cleaning device 57 that automatically cleans the bracket cylinder 54 and a pressure cylinder automatic cleaning device 58 that automatically cleans the impression cylinder 55.

  The paper discharge unit 60 includes a paper discharge drum 61, a delivery chain 62 that transports paper with claws, a delivery pile board 63 on which the paper transported by the delivery chain 62 is stacked, and a powder spray device 64. Is provided. The delivery bail board 63 is provided with a paper unloading fan 65 and a paper alignment plate (jogger) 66. The paper discharge unit 60 is provided with a paper discharge unit operation panel 67.

  As the paper feeding unit 40, there are a universal feeder method (front separation method) and a stream feeder method (rear separation method). In the universal feeder system, the sheets do not overlap on the feeder board 14 and the sheets are conveyed to the printing unit 50 one by one. On the other hand, in the stream feeder method, the paper is sent to the feeder board 14 in a state where several sheets are stacked while being shifted by about 20 cm. Since such a stream feeder system can feed paper at high speed, this system is adopted in high-speed machines and large-sized machines.

  The configuration of the stream feeder type paper feed unit 40 in a conventional printing press will be described with reference to FIGS. FIG. 7 is a top view showing a configuration of a paper feeding unit of a conventional sheet-fed printing press, and FIG. 8 is a side view showing a configuration of a feeder board and the like in the paper feeding unit shown in FIG. 7 and 8, the bill feeding direction, that is, the bill feeding direction from the feeder pile board 12 to the feeder board 14 is indicated by arrows. In FIG. 8, the paper is indicated by reference symbol P.

  As shown in FIG. 7, the feeder pile board 12 and the feeder board 14 are continuously installed in the paper feeding unit 40, and the sheets stacked on the feeder pile board 12 are fed by the sheet feeding mechanism 18 shown in FIG. 1. It is sent out to the feeder board 14 along the arrow direction of FIG.

  As shown in FIG. 7, the feeder board 14 is provided with a paper feeding belt 71 for conveying the paper in the paper feeding direction on the feeder board 14. Further, as shown in FIGS. 7 and 8, a paper pressing roller 72 that presses the paper conveyed by the paper feeding belt 71 from above is provided apart from the paper feeding belt 71. Further, a paper presser wheel 73, a paper presser bar 74, a paper presser ball 75, and a paper presser plate 76 for pressing the paper transported by the paper feed belt 71 from above are separated upward from the feeder board 14, respectively. Is provided. Further, the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 collides with the front edge of the feeder board 14 in the sheet feeding direction (the upper edge of the feeder board 14 in FIG. 7). A plurality of front pads 78 for stopping the paper are provided. The front pad 78 is swingable as shown by an arrow in FIG. 8, and is fed from the feeder pile board 12 to the feeder board 14 when the front pad 78 is in a standing state as shown in FIG. The received paper collides with the front pad 78 and stops.

  In addition, as shown in FIG. 7, a machine that detects this when two sheets of paper are overlapped and fed to the feeder board 14 by the paper feeding mechanism 18 between the feeder pile board 12 and the feeder board 14. A double-type detector 81 is provided. Further, a pile upper surface detector 82 for detecting the upper surface of the paper stacked on the feeder pile board 12 is provided above the feeder pile board 12. In the vicinity of each front pad 78, a register detector 83 that detects the registration of the paper that collided with the front pad 78 is provided. In addition, a photoelectric two-sheet detector 85 is provided at the front edge of the feeder board 14 in the sheet feeding direction to detect when two sheets are overlapped and fed to the feeder board 14 by the sheet feeding mechanism 18. It has been. An electrostatic double sheet detector 86 is provided on the feeder board 14 for detecting when two sheets are overlapped and fed to the feeder board 14 by the sheet feeding mechanism 18. Further, an overshoot detector 87 for detecting whether or not the sheet fed from the feeder pile board 12 to the feeder board 14 has gone too far is provided at a location downstream of the front edge of the feeder board 14 in the sheet feeding direction. It has been.

  FIG. 8 is a side view showing the configuration of the feeder board 14 and the like in the paper feeding unit shown in FIG. As shown in FIG. 8, the sheet sent from the feeder pile board 12 to the feeder board 14 collides with the front pad 78 and is temporarily stopped, and then delivered to the impression cylinder 90. More specifically, a claw 90 a is formed on the outer peripheral surface of the impression cylinder 90, and the paper once stopped by the front pad 78 on the feeder board 14 is gripped by the claw 90 a and rotates the impression cylinder 90. It is further conveyed along. As shown in FIG. 8, the impression cylinder 90 is provided with a motor 92 that drives the impression cylinder 90, and a rotary encoder 94 that detects the rotational phase of the motor 92 is installed in the motor 92. When the rotary encoder 94 detects that the rotation phase of the motor 92 has reached a predetermined phase, the front support 78 rises from a state where it has fallen. In this way, the paper sent from the feeder pile board 12 to the feeder board 14 collides with the front pad 78 in the standing position and stops, and then the claw 90a reaches the position of the front edge of the feeder board 14. At this time, the front cover 78 falls and the paper stopped by the front support 78 is gripped by the claw 90a, and the paper is further conveyed along the rotation of the impression cylinder 90.

  In the conventional paper feeding unit 40 as shown in FIGS. 7 and 8, regarding the detection of paper misalignment, a front pad 78 serving as a stopper in the traveling direction of the paper fed from the feeder pile board 12 to the feeder board 14 is used. The sheet deviation is detected by detecting the presence of the sheet by a light reflection type or light transmission type photoelectric sensor provided in a lateral pad (not shown) for positioning the sheet in the horizontal direction. . However, as the speed of the printing press increases, the timing at which the paper is sent from the feeder pile board 12 to the feeder board 14 varies, and the speed at which the paper hits the front cover 78 and the side cover increases. Bounces after hitting the front cover 78 or the like, and as a result, a paper misalignment may occur after the photoelectric sensor detects the presence of the paper. As a result, the quality of the printed matter is deteriorated due to the paper misalignment in the front pad 78 and the lateral pad.

  Further, as the speed of the printing press increases, the timing at which the paper is sent from the feeder pile board 12 to the feeder board 14 varies, so that the paper sent to the feeder board 14 is delayed or advanced, or the paper feed direction ( Skew occurs in the vertical direction in FIG. In a normal printing machine, when a sheet is sent from the feeder pile board 12 to the feeder board 14 in such a state, an abnormality is detected when the sheet reaches the front pad 78 and the sheet feeding unit 40 is stopped (feeder). Stop) function is working. However, when a feeder stop occurs, it is necessary for the worker to perform correction work each time, which causes a problem that not only the load increases for the worker but also the operating rate of the printing press decreases.

  For such a problem, Patent Document 3 describes a method of detecting the amount of paper misalignment of paper sent to a feeder board, but does not describe any device for preventing paper misalignment itself. . For this reason, conventionally, it has been necessary to reduce the sheet conveyance speed or to adjust the position of the rollers installed above the feeder board, the pressing pressure, etc.

  In addition, as a technique for dealing with delay, advance or skew of paper sent to the feeder board 14, the phase of the driving speed of the feeder board and the driving speed of the printing press as disclosed in Patent Document 5 is set for each paper. And a method of changing the speed of the conveying belt on the feeder board according to the size of the paper, as disclosed in Japanese Patent Application Laid-Open No. 2004-133620, are known. However, the conventional method cannot cope with a sheet that has suddenly entered a skew state or the like, and a feeder caused by delay or advance of the sheet sent to the feeder board 14 or skew. The problem of stop still remains.

Japanese Patent Laid-Open No. 2004-155509 JP 2002-173238 A Patent No. 3053707 JP 2008-6632 A JP 2009-34948 A JP 2003-48643 A

  The present invention has been made in consideration of the above points, and the paper fed from the stacking unit to the feeder board is stopped by sucking and stopping the paper fed from the stacking unit to the feeder board. About the paper feeding unit of the printing press, which can prevent the occurrence of troubles such as paper misalignment and skew, reduce the burden on the operator and improve the printing quality, It is an object of the present invention to provide a printing machine and a paper feeding method for the printing machine.

  The present invention is provided in the stacking unit in which sheets are stacked in a stacked state, a feeder board to which sheets are fed from the stacking unit, a sheet feeding mechanism for feeding sheets from the stacking unit to the feeder board, and the feeder board. And a suction mechanism for sucking paper fed from the stacking unit to the feeder board by the paper feed mechanism.

  According to such a paper feeding unit of the printing press, since the feeder board is provided with the suction mechanism, the paper sent from the stacking unit to the feeder board can be sucked and stopped by the suction mechanism. Thus, it is possible to prevent troubles such as sheet misalignment and skew feeding from the sheet fed from the stacking unit to the feeder board.

  In the paper feeding unit of the printing press according to the present invention, the suction mechanism may be an electrostatic suction device.

  In the paper feeding unit of the printing press according to the present invention, the suction mechanism is movably provided with respect to the feeder board, and the suction mechanism is fed from the stacking unit to the feeder board by the paper feeding mechanism. After the sucked paper is sucked, the suction mechanism may be moved with respect to the feeder board to correct the posture of the sucked paper.

  In the paper feeding unit of the printing machine according to the present invention, the front edge of the paper fed from the stacking unit to the feeder board by the paper feeding mechanism collides, and the paper feeding mechanism stops the paper. A sheet skew amount detecting means for detecting a skew amount, which is a degree of skew of the sheet sent from the stacking unit to the feeder board with respect to a feeding direction of the sheet, and the suction mechanism includes the suction mechanism, The posture of the sucked paper may be corrected based on the paper skew amount detected by the paper skew amount detecting means.

  At this time, the sheet skew amount detecting means also detects an advance amount or a delay amount in the sheet feeding direction of the sheet fed from the stacking unit to the feeder board by the sheet feeding mechanism. The suction mechanism may be configured to correct the posture of the sucked paper based on the paper skew amount detected by the paper skew amount detection means and the advance amount or delay amount.

  Further, the sheet skew amount detecting means may include an image pickup camera for picking up an image of the sheet fed from the stacking unit to the feeder board by the sheet feeding mechanism.

  In the paper feeding unit of the printing press according to the present invention, the front edge of the paper fed from the stacking unit to the feeder board by the paper feeding mechanism collides, and a front pad for stopping the paper and the vicinity of the front pad And a sheet detecting means for detecting the sheet before or at the moment when the front edge of the sheet fed from the stacking unit to the feeder board by the sheet feeding mechanism collides with the front pad. The adsorbing mechanism removes the paper before or when it collides with the front cover when the paper fed from the stacking unit to the feeder board by the paper feeding mechanism is detected by the paper detection means. It may be adsorbed.

  At this time, the paper detection means may include an optical sensor.

  The present invention provides a paper feeding unit of the printing machine as described above, a printing unit unit that performs printing on the paper fed by the paper feeding unit, and a paper discharge that discharges the paper printed by the printing unit unit. A printing machine.

  The present invention includes a step of stacking sheets in a stacking state on a stacking unit, a step of feeding sheets stacked on the stacking unit to a feeder board, and a suction mechanism provided on the feeder board from the stacking unit to the feeder. And a step of sucking the sheet fed to the board.

  According to such a paper feeding method of the printing press, the paper fed from the stacking unit to the feeder board can be sucked and stopped by the suction mechanism. It is possible to prevent troubles such as sheet misalignment and skew feeding of the fed sheet.

  In the paper feeding method of the printing press according to the present invention, the suction mechanism is provided movably with respect to the feeder board, and the suction mechanism sucks the paper fed from the stacking unit to the feeder board. Thereafter, the suction mechanism may be moved relative to the feeder board to correct the posture of the sucked paper.

  According to the paper feeding unit, the printing machine, and the paper feeding method of the printing machine according to the present invention, it is possible to prevent the occurrence of troubles such as paper misalignment and skew in the paper fed from the stacking unit to the feeder board. In addition, the burden on the operator can be reduced and the printing quality can be improved.

It is a block diagram which shows the schematic structure of a sheet-fed printing press. It is a top view which shows the structure of the paper feed part of the sheet-fed printing press by embodiment of this invention. FIG. 3 is a side view illustrating a configuration of a feeder board and the like in the paper feeding unit illustrated in FIG. 2. It is a top view which shows the method of correcting the attitude | position of the paper attracted | sucked to the said electrostatic attraction apparatus with the electrostatic attraction apparatus provided in the paper feed part shown in FIG. It is a top view which shows the other structure of the paper feed part of the sheet-fed printing press by embodiment of this invention. FIG. 6 is a side view illustrating a configuration of a feeder board and the like in the sheet feeding unit illustrated in FIG. 5. It is a top view which shows the structure of the paper feed part of the conventional sheet-fed printing press. FIG. 8 is a side view illustrating a configuration of a feeder board and the like in the sheet feeding unit illustrated in FIG. 7.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 2 to 4 are views showing a sheet feeding unit of the sheet-fed printing press according to the present embodiment. Among these, FIG. 2 is a top view showing a configuration of a sheet feeding unit of the sheet-fed printing press according to the present embodiment, and FIG. 3 is a side view showing a configuration of a feeder board and the like in the sheet feeding unit shown in FIG. It is. FIG. 4 is a top view showing a method of correcting the posture of the paper adsorbed on the electrostatic adsorption device by the electrostatic adsorption device provided in the paper feeding unit shown in FIG. 2 to 4, the bill feeding direction, that is, the bill feeding direction from the feeder pile board 12 to the feeder board 14 is indicated by arrows. 3 and 4, the paper is indicated by the reference symbol P.

  The paper supply unit 10 according to the present embodiment is used in a sheet-fed printing machine as shown in FIG. In the present embodiment, a stream feeder type paper feeding unit 10 is used in which paper is fed to the feeder board 14 in a state where several sheets are stacked while being shifted by about 20 cm.

  The structure of the sheet feeder 10 of the stream feeder system in this embodiment will be described with reference to FIGS. As shown in FIG. 2, a feeder pile board 12 and a feeder board 14 are continuously installed in the sheet feeding unit 10, and sheets stacked on the feeder pile board 12 are fed along the arrow direction of FIG. 2. To be sent to.

  As shown in FIG. 2, the feeder board 14 is provided with a paper feeding belt 21 for conveying paper in the paper feeding direction on the feeder board 14. As shown in FIGS. 2 and 3, a paper pressing roller 22 that presses the paper conveyed by the paper feeding belt 21 from above is provided away from the paper feeding belt 21. Further, a paper presser wheel 23, a paper presser bar 24, a paper presser ball 25, and a paper presser plate 26 for pressing the paper transported by the paper feed belt 21 from above are separated upward from the feeder board 14, respectively. Is provided. Further, the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 collides with the front edge of the feeder board 14 in the sheet feeding direction (the upper edge of the feeder board 14 in FIG. 2). A plurality of front pads 28 for stopping the paper are provided. The front pad 28 is swingable as shown by the arrow in FIG. 3, and is fed from the feeder pile board 12 to the feeder board 14 when the front pad 28 is in the standing position as shown in FIG. The received paper collides with the front pad 28 and stops.

  Further, as shown in FIG. 2, the feeder board 14 has an electrostatic adsorption device that adsorbs the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 (see FIG. 1) by electrostatic adsorption force. 29 is provided as an adsorption mechanism. The electrostatic adsorption device 29 is provided in the vicinity of the front end edge (upper end edge in FIG. 2) of the feeder board 14 in the sheet feeding direction. The electrostatic adsorption device 29 is provided so as to be movable with respect to the feeder board 14. The electrostatic adsorption device 29 adsorbs the sheet fed from the feeder pile board 12 to the feeder board 14, and then As the electroadsorption device 29 moves relative to the feeder board 14, the posture of the adsorbed paper is corrected. Specifically, the electrostatic adsorption device 29 slides back and forth on the feeder board 14 along the paper feeding direction (vertical direction in FIG. 2), or rotates with respect to the feeder board 14 about the center thereof. It has come to do.

  As shown in FIG. 3, the electrostatic adsorption device 29 is provided with a motor 29a for driving the electrostatic adsorption device 29. The motor 29a causes the electrostatic adsorption device 29 to follow the paper feeding direction. Then, it slides back and forth on the feeder board 14 and rotates with respect to the feeder board 14 with its center as the central axis. In addition, an electrostatic chuck controller 29b is connected to the motor 29a, and electric power is supplied to the electrostatic chuck 29 by the electrostatic chuck controller 29b. Then, on / off of power supply to the electrostatic attraction device 29 by the electrostatic attraction device controller 29b is switched, and on / off of the attraction of paper by the electrostatic attraction device 29 is controlled. ing. The electrostatic chuck controller 29 also controls the drive of the motor 29a. Details of the operation of the electrostatic adsorption device 29 will be described later.

  As shown in FIG. 2, a machine that detects this when two sheets of paper are overlapped and fed to the feeder board 14 by the paper feed mechanism 18 between the feeder pile board 12 and the feeder board 14. A double-type detector 31 is provided. In addition, a pile upper surface detector 32 that detects the upper surface of the paper stacked on the feeder pile board 12 is provided above the feeder pile board 12. In addition, register detectors 33 that detect the registration of the paper that has collided with the front pads 28 are provided in the vicinity of the front pads 28. Further, a photoelectric double sheet detector 35 is provided at the front edge of the feeder board 14 in the sheet feeding direction to detect when two sheets are overlapped and fed to the feeder board 14 by the sheet feeding mechanism 18. It has been. An electrostatic double sheet detector 36 is provided on the feeder board 14 to detect when two sheets are overlapped and fed to the feeder board 14 by the sheet feeding mechanism 18. Further, an overshoot detector 37 for detecting whether or not the sheet fed from the feeder pile board 12 to the feeder board 14 has gone too far is provided at a position downstream of the front edge of the feeder board 14 in the sheet feeding direction. It has been.

  2 and 3, a pair of left and right imaging cameras 38 are spaced upward from the feeder board 14 in the vicinity of the rear edge (lower edge in FIG. 2) of the feeder board 14 in the paper feeding direction. Is provided. The imaging camera 38 captures an image of the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18. As shown in FIG. 3, imaging data from the imaging camera 38 is sent to the electrostatic chuck controller 29 b, and the electrostatic chuck controller 29 b is based on the imaging data sent from the imaging camera 38. Thus, the skew amount, which is the degree of skew with respect to the paper feeding direction (vertical direction in FIG. 2), is detected. The electrostatic chuck controller 29b also detects an advance amount or a delay amount in the paper feeding direction based on the imaging data sent from the imaging camera 38. Here, the advance amount or the delay amount in the paper feeding direction indicates a deviation of how much the actual paper is advanced or delayed from the original position of the paper sent from the feeder pile board 12 to the feeder board 14. Amount.

  FIG. 3 is a side view showing a configuration of the feeder board 14 and the like in the paper feeding unit shown in FIG. As shown in FIG. 3, the sheet sent from the feeder pile board 12 to the feeder board 14 collides with the front pad 28 and is temporarily stopped, and then delivered to the impression cylinder 90. More specifically, a claw 90 a is formed on the outer peripheral surface of the impression cylinder 90, and the paper once stopped by the front pad 28 on the feeder board 14 is gripped by the claw 90 a and rotates the impression cylinder 90. It is further conveyed along. As shown in FIG. 3, the impression cylinder 90 is provided with a motor 92 that drives the impression cylinder 90, and a rotary encoder 94 that detects the rotational phase of the motor 92 is installed in the motor 92. When the rotary encoder 94 detects that the rotational phase of the motor 92 has reached a predetermined phase, the front pad 28 rises from a state where it has fallen. In this way, the paper sent from the feeder pile board 12 to the feeder board 14 collides with the front pad 28 in the standing state and stops, and then the claw 90a reaches the position of the front edge of the feeder board 14. At this time, the front pad 28 is tilted and the paper stopped by the front pad 28 is gripped by the claw 90 a, and the paper is further conveyed along the rotation of the impression cylinder 90.

  In the paper feeding unit 10 of the present embodiment, the electrostatic adsorption device 29 electrostatically adsorbs the paper immediately after the paper sent from the feeder pile board 12 to the feeder board 14 collides with the front pad 28, and removes the paper. After the adsorption, the electrostatic adsorption device 29 moves relative to the feeder board 14 based on the skew amount of the paper detected by the electrostatic adsorption device controller 29b and the advance amount or the delay amount. The posture of the paper is corrected. The operation of the electrostatic adsorption device 29 will be described in detail with reference to FIG. FIG. 4 is a top view showing a method for correcting the posture of the paper adsorbed on the electrostatic adsorption device 29 by the electrostatic adsorption device 29.

  As shown in FIG. 4A, when the sheet is fed from the feeder pile board 12 to the feeder board 14 while being skewed with respect to the sheet feeding direction (left and right direction in FIG. 4), the sheet is picked up by the imaging camera 38. Image data is sent from the imaging camera 38 to the electrostatic chuck controller 29b, and the electrostatic chuck controller 29b sends out the paper based on the imaging data sent from the imaging camera 38. A skew amount that is a degree of skew with respect to the direction is detected. The electrostatic chuck controller 29b controls the motor 29a based on the detected skew amount, and rotates the electrostatic chuck 29 with respect to the feeder board 14 as shown in FIG. As a result, the sheet attracted by the electrostatic attracting device 29 also rotates integrally with the electrostatic attracting device 29, and the orientation of the sheet is corrected so as to follow the sheet feeding direction. In this way, the electrostatic adsorption device 29 is rotated by the electrostatic adsorption device 29 rotating relative to the feeder board 14 based on the skew amount of the paper detected by the electrostatic adsorption device controller 29b. Correct the orientation of the paper on the feeder board 14.

  Similarly, when the paper sent out from the feeder pile board 12 to the feeder board 14 has advanced or delayed from the original position of the paper in the paper feeding direction, the imaging camera 38 causes the paper to be fed. When the image is picked up, the electrostatic attraction device controller 29b detects the advance amount or the delay amount in the paper feed direction based on the image data sent from the image pickup camera 38. The electrostatic chuck controller 29b controls the motor 29a based on the detected advance amount or delay amount, and slides the electrostatic chuck device 29 along the sheet feeding direction with respect to the feeder board 14. As a result, the paper adsorbed by the electrostatic adsorption device 29 also slides integrally with the electrostatic adsorption device 29, and the position of the paper is corrected to the original position. In this way, the electrostatic adsorption device 29 causes the electrostatic adsorption device 29 to feed the paper to the feeder board 14 based on the advance amount or delay amount of the paper detected by the electrostatic adsorption device controller 29b. The posture of the adsorbed paper is corrected on the feeder board 14 by sliding along.

  Note that the correction of the skew of the sheet and the correction of the advance or delay in the sheet feeding direction as described above may be simultaneously performed by the electrostatic attraction device 29. Further, as the electrostatic attraction device 29 according to the modified example, a device that does not correct the advance or delay in the paper feeding direction but only corrects the skew state of the paper may be used. .

  As described above, according to the paper feeding unit 10 of the printing press of the present embodiment, the feeder board 14 is fed from the feeder pile board (stacking unit) 12 to the feeder board 14 by the paper feeding mechanism 18 (see FIG. 1). An electrostatic adsorption device 29 that adsorbs the collected paper is provided as an adsorption mechanism. By providing such an electrostatic adsorption device 29, the sheet fed from the feeder pile board 12 to the feeder board 14 can be adsorbed by the electrostatic adsorption device 29 and stopped. As a result, it is possible to prevent troubles such as sheet misalignment and skew of the sheet sent from the feeder pile board 12 to the feeder board 14.

  Further, in the paper feeding unit 10 of the printing press according to the present embodiment, the electrostatic adsorption device 29 is provided so as to be movable with respect to the feeder board 14, and the electrostatic adsorption device 29 is fed to the feeder by the paper feeding mechanism 18. After attracting the sheet sent from the pile board 12 to the feeder board 14, the electrostatic attracting device 29 moves relative to the feeder board 14 to correct the posture of the attracted sheet. More specifically, based on the image data of the sheet imaged by the imaging camera 38, the skew of the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 with respect to the feeding direction of the sheet. The amount of skew feeding is detected by the electrostatic chuck controller 29b, and the electrostatic chuck 29 determines the posture of the sucked paper based on the detected skew amount of the paper. The correction is made on the board 14. As a result, even when a sheet is fed from the feeder pile board 12 to the feeder board 14 while being skewed with respect to the sheet feeding direction, the orientation of the sheet can be corrected by the electrostatic suction device 29. become. In the present invention, the skew feeding amount detecting means for detecting the skew feeding amount in the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 by the electrostatic chuck controller 29b and the imaging camera 38. Is configured.

  Further, an advance amount or a delay amount in the sheet feeding direction of the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 is also detected by the controller 29b for electrostatic attraction device. The electrostatic adsorption device 29 corrects the attitude of the adsorbed paper on the feeder board 14 based on the detected advance or delay of the paper. Thus, even if the paper sent from the feeder pile board 12 to the feeder board 14 has advanced or delayed relative to the original position, the electrostatic adsorbing device 29 corrects the advance or delay of the paper. Will be able to.

  Note that the paper feeding unit and the paper feeding method of the printing press according to the present invention are not limited to the above-described modes, and various changes can be made.

  A modification of the paper feed unit of the printing machine according to the present invention will be described with reference to FIGS. FIG. 5 is a top view showing another configuration of the paper feed unit of the sheet-fed printing press according to the present embodiment, and FIG. 6 is a side view showing the configuration of a feeder board and the like in the paper feed unit shown in FIG. is there. 5 and 6, the bill feeding direction, that is, the bill feeding direction from the feeder pile board 12 to the feeder board 14 is indicated by an arrow. In FIG. 6, the paper is indicated by a reference symbol P.

  5 and 6 is not provided with the imaging camera 38 and is provided with a paper detection sensor 39 instead of the paper supply unit 10 shown in FIGS. It differs only in the point, and the other structure is substantially the same as that of the sheet feeding unit 10 shown in FIGS. In the following description of the paper feeding unit 10a shown in FIGS. 5 and 6, the same reference numerals are given to the same parts as those of the paper feeding unit 10 shown in FIGS. 2 to 4, and the description thereof is omitted.

  As shown in FIGS. 5 and 6, a paper detection sensor 39 is provided in the vicinity of the front edge (upper edge in FIG. 5) in the paper feeding direction. The paper detection sensor 39 is composed of, for example, an optical sensor, and the paper detection sensor 39 applies the front edge of the paper sent from the feeder pile board 12 to the feeder board 14 by the paper delivery mechanism 18 to the front. 28 is detected before or at the moment of collision.

  Further, in the paper feeding unit 10a shown in FIGS. 5 and 6, as shown in FIG. 6, an electrostatic chuck controller 29c is connected to the electrostatic chuck 29, and this electrostatic chuck controller 29c. As a result, electric power is supplied to the electrostatic adsorption device 29. Then, on / off of power supply to the electrostatic attraction device 29 by the electrostatic attraction device controller 29c is switched, and on / off of the sheet suction by the electrostatic attraction device 29 is controlled. ing.

  5 and FIG. 6, the sheet detection sensor is used before or at the moment when the front edge of the sheet fed from the feeder pile board 12 to the feeder board 14 collides with the front pad 28 by the sheet feeding mechanism 18. This detection information is sent from the sheet detection sensor 39 to the electrostatic chuck controller 29c when detected by the sensor 39. Then, upon receiving the paper detection information from the paper detection sensor 39, the electrostatic suction device controller 29c switches the paper suction by the electrostatic suction device 29 from OFF to ON. In this way, the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 is attracted by the electrostatic suction device 29. In this way, the sheet can be stopped in a state where it collides with or approaches the front pad 28.

  After the sheet fed from the feeder pile board 12 to the feeder board 14 by the sheet feeding mechanism 18 is sucked by the electrostatic suction device 29, the claw 90 a of the impression cylinder 90 reaches the position of the front edge of the feeder board 14. By turning off the power supply to the electrostatic attraction device 29 by the electroadsorption device controller 29c, the electrostatic attraction device 29 does not attract the paper. When the claw 90 a of the impression cylinder 90 reaches the position of the front edge of the feeder board 14, the front pad 78 falls and the paper stopped by the electrostatic adsorption device 29 is grasped by the claw 90 a, and the impression cylinder 90 The sheet is further conveyed along the rotation.

  As described above, according to the paper feeding unit 10a shown in FIGS. 5 and 6, the paper fed from the feeder pile board 12 to the feeder board 14 by the paper feeding mechanism 18 collides with the front pad 28 or at the moment of the collision. A paper detection sensor 39 for detecting the paper is provided as a paper detection means in the vicinity of the front pad 28, and the electrostatic adsorption device 29 is a paper fed from the feeder pile board 12 to the feeder board 14 by the paper feed mechanism 18. Is detected by the sheet detection sensor 39, the sheet is sucked before or at the moment of collision with the front pad 28. As a result, it is possible to prevent the phenomenon that the speed at which the paper hits the front pad 28 increases and the paper bounces after hitting the front pad 28. As a result, it is possible to prevent a quality defect of the printed matter due to the paper misalignment due to the bounce after hitting the front pad 28.

  Further, as a paper feeding unit of a printing press according to a further modification, the imaging camera 38, the motor 29a, the electrostatic chuck controller 29b, etc. in the paper feeding unit 10 shown in FIGS. 2 to 4, and FIGS. It is also possible to use one provided with all of the paper detection sensors 39 and the like in the paper feeding unit 10a shown. In this case, the electrostatic attraction device 29 is configured to detect whether the paper fed from the feeder pile board 12 to the feeder board 14 by the paper feed mechanism 18 is detected by the paper detection sensor 39 before colliding with the front pad 28 or At the moment of collision, the sheet is sucked, and after the sheet is sucked, the electrostatic chucking device 29 moves with respect to the feeder board 14 so that the posture of the sucked sheet can be corrected.

  In the present invention, the suction mechanism that sucks the paper is not limited to the electrostatic suction device 29 that sucks the paper by the electrostatic suction force, and other vacuum suction devices such as a vacuum suction device that sucks the paper by vacuum suction. You may use the adsorption | suction apparatus of a structure. Further, the suction mechanism is not limited to the one provided movably with respect to the feeder board 14, and the suction mechanism may be provided on the feeder board 14 in a fixed position.

DESCRIPTION OF SYMBOLS 10, 10a Paper feed part 12 Feeder pile board 14 Feeder board 16 Soccer part 18 Paper feed mechanism 21 Paper feed belt 22 Paper press roller 23 Paper press release water wheel 24 Paper press release 25 Paper press ball 26 Paper press plate 28 29 Electrostatic chuck 29a Motors 29b, 29c Electrostatic chuck controller 31 Mechanical double detector 32 Pile top detector 33 Register detector 35 Photoelectric double detector 36 Electrostatic double detector 37 Overshoot detection Device 38 imaging camera 39 paper detection sensor 40 paper feed unit 50 printing unit 51a ink fountain 51 inking unit 52 dampening unit 53 plate cylinder 54 bracket cylinder 55 impression cylinder 56 paper transfer cylinder 57 automatic bracket cleaning device 58 impression cylinder automatic Cleaning device 60 Paper discharge part 61 Paper discharge cylinder 62 Delivery chain 63 Delivery bail 64 Powder spray device 65 Paper unloading fan 66 Paper alignment plate 67 Paper discharge unit operation panel 71 Paper feed belt 72 Paper press roller 73 Paper press release water wheel 74 Paper press release 75 Paper press ball 76 Paper press plate 78 81 mechanical double detector 82 pile top detector 83 register detector 85 photoelectric double detector 86 electrostatic double detector 87 overshoot detector 90 impression cylinder 90a claw 92 motor 94 rotary encoder

Claims (11)

A stacking unit in which sheets are stacked in a stacked state;
A feeder board to which paper is fed from the stacking unit;
A paper feeding mechanism for feeding paper from the stacking unit to the feeder board;
An adsorption mechanism that is provided on the feeder board and adsorbs the sheet fed from the stacking unit to the feeder board by the sheet feeding mechanism;
The printer's paper feed unit.   The paper feeding unit of the printing press according to claim 1, wherein the suction mechanism is an electrostatic suction device. The suction mechanism is provided movably with respect to the feeder board,
The sucking mechanism corrects the posture of the sucked paper by sucking the paper fed from the stacking unit to the feeder board by the paper feeding mechanism and then moving the sucking mechanism relative to the feeder board. The paper feed unit of the printing press according to claim 1 or 2, wherein The front edge of the front edge of the paper sent from the stacking unit to the feeder board by the paper feeding mechanism collides, and stops the paper,
A sheet skew amount detecting means for detecting a skew amount which is a degree of skew in the sheet feeding direction from the stacking unit to the feeder board by the sheet feeding mechanism;
Further comprising
The paper feeding unit of a printing press according to claim 3, wherein the suction mechanism is configured to correct the posture of the sucked paper based on the skew feeding amount of the paper detected by the paper skew feeding amount detecting means. . The sheet skew feeding amount detecting means is configured to detect an advance amount or a delay amount in the sheet feeding direction in the sheet fed from the stacking unit to the feeder board by the sheet feeding mechanism.
5. The suction mechanism corrects the posture of the sucked sheet based on the skew amount of the sheet detected by the sheet skew amount detecting unit and the advance amount or the delay amount. Paper feed section of the printer.   The paper feed unit of the printing press according to claim 4 or 5, wherein the skew feeding amount detection unit includes an imaging camera that images the paper fed from the stacking unit to the feeder board by the paper feed mechanism. The front edge of the front edge of the paper sent from the stacking unit to the feeder board by the paper feeding mechanism collides, and stops the paper,
Paper detecting means provided in the vicinity of the front pad and detecting the paper before or at the moment when the front edge of the paper fed from the stacking unit to the feeder board by the paper feed mechanism collides with the front pad. When,
Further comprising
The suction mechanism sucks the paper before or when it collides with the front cover when the paper sent from the stacking unit to the feeder board by the paper feed mechanism is detected by the paper detection means. The paper feeding unit of the printing press according to claim 1, wherein   The paper feeding unit of a printing press according to claim 7, wherein the paper detection means includes an optical sensor. A paper feed unit of the printing press according to any one of claims 1 to 8,
A printing unit for printing on the paper fed by the paper feeding unit;
A paper discharge unit for discharging the paper printed by the printing unit;
A printing machine, comprising: A process of stacking sheets in a stacked state in the stacking unit;
Sending out the paper accumulated in the stacking unit to a feeder board;
A step of sucking paper fed from the stacking unit to the feeder board by a suction mechanism provided on the feeder board;
A paper feeding method for a printing press. The suction mechanism is provided movably with respect to the feeder board,
The suction mechanism is configured to correct the posture of the sucked paper by sucking the paper sent from the stacking unit to the feeder board and then moving the suction mechanism with respect to the feeder board. A paper feeding method for a printing press according to claim 10.

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