JP2008290790A - Paper feeder of sheet-fed printing press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent any printing trouble in advance by automatically detecting non-aligned paper sheets irrespective of the size of paper sheets. <P>SOLUTION: When each of a pair of outer and inner non-aligned paper sheet detection sensors 41, 43 detects a front end of a paper sheet reaching a mouth plate, the take-in of the detection signal of the pair of inner non-aligned paper sheet detection sensors 43 is canceled, and only the detection signal of the pair of outer non-aligned paper sheet detection sensors 41 is taken in. On the other hand, when the front end of the paper sheet reaching the mouth plate is not detected by the pair of outer non-aligned paper sheet detection sensors 41, but detected by the pair of inner non-aligned paper sheet detection sensors 43, the take-in of the signal is controlled by a control device 47 so that the take-in of the detection signal of the pair of outer non-aligned paper sheet detection sensors 41 is canceled, and only the detection signal of the pair of inner non-aligned paper sheet detection sensors 43 is taken in. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to measures against irregular paper in a sheet feeding device of a sheet-fed printing press.

  In Patent Document 1, a pair of first detection sensors arranged at intervals in a direction intersecting with the sheet conveyance direction, and 4 arranged at intervals in the same direction intersecting with the sheet conveyance direction. The second detection sensors are arranged in the vicinity of the front contact so as to be displaced in the sheet transport direction, and the first detection sensor detects the front edge of the sheet with a small bend, while the second detection sensor There is disclosed a sheet feeder for a sheet-fed printing machine that detects the leading edge of a sheet with a large bend.

The first detection sensor is composed of three sensors, and these three sensors are arranged so as to be displaced in the sheet transport direction. Then, the operator selects an arbitrary sensor from the three sensors according to the position adjustment in the sheet transport direction of the front sheet according to the size of the sheet, and the position-adjusted front sheet and selection are selected. The detection accuracy of the sensor is increased so that the position of the sensor is not changed.
Japanese Patent No. 3351621 (paragraphs 0011 to 0014, FIG. 1, FIG. 4 (b))

  However, in the above-mentioned Patent Document 1, since the operator manually selects the sensor, if the selection is forgotten, the position of the position-adjusted front contact and the sensor changes, and the detection accuracy of the sensor decreases. May cause printing problems.

  By the way, in the above-mentioned sheet-fed printing machine, when printing sheets of different sizes, if the sheet (irregular paper) in a twisted state is sent to the printing unit, the printed material becomes unusable. In order to detect sheets of different sizes, a pair of irregular paper detection sensors that are spaced apart from each other are fixedly placed on the mouth plate so that they are positioned on a straight line that intersects the sheet transport direction. When printing a sheet, the operator presses a key on the corresponding operation panel (monitor setting screen) so as to select the outside irregular paper detection sensor, while printing a smaller sheet. In this case, in general, the operator presses the key on the corresponding operation panel (monitor setting screen) so as to select the inside irregular paper detection sensor.

  In this case as well, as in Patent Document 1, the operator manually selects a sensor (key operation). For example, during the previous printing, the sensor is switched to the inner irregular paper detection sensor and printed on a small sheet. This time, when printing on large sheets, you must switch to the outside irregular paper detection sensor before starting work, but if you forget this change, print with the previous inner irregular sheet detection sensor as it is Will start. Uneven paper twist can be detected more accurately by detecting the edge than the center, so the inner irregular paper detection sensor located near the center is difficult to detect the twist of large sheets. , There is a possibility of missing the irregular paper, and there is a possibility of printing failure.

  On the other hand, when printing on a large sheet of paper by switching to the outside irregular paper detection sensor at the previous printing, this time when printing on a small sheet of paper, the inner irregular paper detection sensor before starting the work However, if you forget to switch to this, printing will start with the previous outside irregular paper detection sensor, and the outside irregular paper detection sensor will be in a position off the small sheet. Therefore, the sensor beam does not reach the sheet, and it is erroneously recognized that the sheet has not reached (feeder board jam or the like), resulting in a printing failure.

  The present invention has been made in view of this point, and an object of the present invention is to automatically detect irregular paper regardless of the size of the sheet and prevent printing troubles in advance.

  In order to achieve the above object, the present invention constantly monitors the sheet with the inside and outside irregular paper detection means, and uses the detection signal of the outside irregular paper detection means for the large size sheet, The detection signal of the inside irregular paper detection means is used for a small sheet of paper.

  More specifically, the present invention is directed to a sheet feeding device of a sheet-fed printing machine that continuously feeds a plurality of sheets one by one to a printing unit through a feeder board, and provides the following solution. I took it.

  In other words, the invention according to claim 1 is characterized in that a mouth plate disposed in a fixed manner so as to be continuous with the downstream end side of the feeder board, and a conveyance direction of the maximum width sheet used in the printing press. A pair of outside irregular paper detection means fixedly arranged on the above-mentioned mouth plate so as to correspond to the inside of both ends in the intersecting direction, and the conveyance direction of the smallest width sheet used in the printing machine Fixedly arranged on the mouth plate so as to correspond to the inside of both ends in the direction in which the paper is positioned and to be positioned on a straight line connecting the two outer irregular paper detection means inside the pair of outer irregular paper detection means. A pair of inner irregular paper detection means and a pair of outer and inner irregular paper detection means both detect the front end of the sheet that has reached the mouth plate, and at least a pair of outer irregular paper detection. While capturing the detection signal of the means, If the pair of outer irregular paper detection means does not detect the front edge of the sheet and the pair of inner irregular paper detection means detect both, the detection signal of the pair of outer irregular paper detection means is captured. And a control unit that controls the capture of the signals so as to cancel and capture only the detection signals of the pair of inside irregular paper detection units.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control means detects the front end of the sheet that has reached the mouth plate by each of the pair of outer and inner irregular paper detection means. In this case, the control is performed so that the detection signals of the pair of inside irregular paper detection means are also taken in.

  According to the first aspect of the present invention, when each of the pair of outer and inner irregular paper detecting means detects that the printing has started and the front edge of the sheet has reached the mouth plate through the feeder board, this sheet is detected. The control unit captures a detection signal of at least a pair of outer irregular paper detection units as if the sheet is a large size. On the other hand, when only the pair of inner irregular paper detection means detects that the front edge of the sheet has reached the mouth plate, the sheet is regarded as a small size, and the detection signal of the pair of outer irregular paper detection means The control unit captures only the detection signals of the pair of inner irregular paper detection units.

  As a result, since the edge of each sheet of different sizes is detected, the sheet can be accurately detected without detection error, and it can be detected reliably without missing any irregular paper that is twisted. Printing trouble can be prevented.

  In addition, since the control means automatically takes in the signals of the outside and inside irregular paper detection means, there is no troublesome forgetting to switch manually or forgetting to change.

  According to the invention of claim 2, when each of the pair of outer and inner irregular paper detecting means detects that the front end of the sheet has reached the mouth plate, the pair of outer irregular paper detecting means When the control means captures not only the detection signals but also the detection signals of the pair of inner irregular paper detection means, the center of a large sheet is damaged due to tearing etc. and cannot be detected by the outer irregular paper detection means It is preferable because it can detect that the paper is irregular.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 is a schematic configuration diagram of an offset sheet-fed printing press, where 1 is a feeder unit, 3 is a printing unit unit, and 5 is a paper discharge unit.

  The feeder section 1 is an area for automatically feeding sheets P one by one to the printing unit section 3, and includes a sheet feed tray 7 on which the sheets P are stacked, and a separator that feeds the sheets P one by one ( (Not shown), and a sheet feeding device 11 including a feeder board 9 and the like for conveying the sheet P fed by the separator to the printing unit 3.

  The printing unit section 3 is an area for printing the sheet P automatically fed from the feeder section 1, and includes an ink supply device 13, a transfer cylinder 15, and an impression cylinder 17 composed of a number of roller groups. 5 units of the printing unit 23 including the rubber cylinder 19 and the plate cylinder 21 as one unit are provided.

  The paper discharge unit 5 is an area for transporting and aligning the sheets P printed by the printing unit unit 3, and transports the printed sheets P with a chain gripper (not shown) and transports them downstream. A paper discharge device 31 including a chain 25, a drying device 27 that dries the ink of the printed sheet P during conveyance, and a paper discharge tray 29 on which the printed sheet P conveyed by the conveyance chain 25 is stacked. It has.

  Then, a large number of sheets P stacked on the sheet feeding table 7 of the feeder unit 1 are successively fed to the feeder board 9 one by one by the separator, and the fed sheet P is further fed to the feeder board 9. Then, the paper is sent to each printing unit 23 of the printing unit unit 3, printed while delivering the sheet P between the printing units 23, and stacked on the paper discharge tray 29 of the paper discharge unit 5.

  On the downstream end side of the feeder board 9, as shown in FIG. 3, the mouth plate 33 is disposed so as to be continuous and fixed, and on the front side (downstream end side) of the mouth plate 33, A plurality of front pads 35 are arranged close to each other at intervals along the width direction of the sheet P so that they can be withdrawn and withdrawn. Then, the front end of the sheet P conveyed by the feeder board 9 is stopped by the front pad 35 and the front side portion thereof is aligned at a proper position so as not to be tilted on the mouth plate 33. Positioning in the front-rear direction is performed.

  In addition, a plurality of swing claws (grippers) 37 (see FIG. 4) are arranged between the adjacent front pads 35 so as to be able to be alternately withdrawn from and retracted from the front pads 35. A paper feed drum 39 is disposed between the pressure drum 17 and the swing claw 37 (see FIG. 4). The sheet P positioned by the front pad 35 is gripped by the swing claw 37, transferred to the paper feed drum 39, and supplied to the printing unit unit 3. The mouth plate 33, the front pad 35, the swing claw 37, and the paper feed drum 39 are also constituent elements of the paper feed device 11.

  On the front side of the mouth plate 33, as shown in FIG. 3, a pair of outer irregular paper detection sensors 41 as outer irregular paper detection means are provided in the conveying direction of the maximum width sheet P used in the printing press. It is fixedly arranged with an interval so as to correspond to the inside of both ends in the intersecting direction. Further, on the front side of the mouth plate 33, an inner irregular paper detection sensor 43 as a pair of inner irregular paper detection means is provided in both ends in the direction intersecting the conveyance direction of the minimum width sheet P used in the printing press. The paper is fixedly arranged at an interval so as to correspond to the side and to be positioned on a straight line connecting the two outside irregular paper detection sensors 41 inside the pair of outside irregular paper detection sensors 41.

  As shown in FIG. 1, the outer irregular paper detection sensor 41 and the inner irregular paper detection sensor 43 are connected to a control device 47 including a CPU as a control unit via an interface board 45. In addition, the drive units of the feeder unit 1, the printing unit unit 3, and the paper discharge unit 5 of the printing press are also connected to the control device 47 via the interface board 45. FIG. 1 shows a feeder driving device 49 which is a driving unit of the feeder unit 1. These drive units are driven and controlled according to a program built in the control device 47.

  The present invention is characterized by the drive control of the feeder drive device 49. Specifically, when each of the pair of outer and inner irregular paper detection sensors 41 and 43 detects the front end of the sheet P that has reached the mouth plate 33, the control device 47 sets the pair of inner irregular paper. The capture of the detection signal of the detection sensor 43 is canceled and the capture of the signal is controlled so that only the detection signal of the pair of outside irregular paper detection sensors 41 is captured, and the currently used sheet P has a large size Recognize that. On the other hand, if the pair of outer irregular paper detection sensors 41 does not detect the front end of the sheet P reaching the mouth plate 33 and the pair of inner irregular paper detection sensors 43 detect both, the control is performed. The apparatus 47 controls the capture of the signals so as to cancel the capture of the detection signals of the pair of outer irregular paper detection sensors 41 and capture only the detection signals of the pair of inner irregular paper detection sensors 43. Recognizing that the sheet P is small in size. For example, the inner irregular paper detection sensor 43 is selected in the case of a sheet P having an A3 size or smaller, and the outer irregular paper detection sensor 41 is selected in the case of a sheet P having a size larger than the A3 size.

  A specific example of the switching control of the outer irregular paper detection sensor 41 and the inner irregular paper detection sensor 43 will be described below with reference to FIG.

  1 and 2, OPS means the operation side (operation side: left side in FIG. 3), and NOPS means the anti-operation side (counter operation side: right side in FIG. 3).

  The operator inputs information necessary for printing by operating the keys on the operation panel (monitor setting screen). The controller 47 recognizes this input, outputs a drive control signal to each drive unit, activates each drive unit, and starts printing.

  When operating the keys on the operation panel, the operator presses the paper feed button on the operation panel. Then, the sheets P are continuously fed from the feeder unit 1 to the printing unit unit 3 one by one. It is determined whether or not paper feeding is in progress depending on whether or not this paper feed button is pressed (step S1). The sheet P conveyed on the feeder board 9 passes over the mouth plate 33, and each of the pair of outer irregular paper detection sensors 41 and the inner irregular sheet detection sensor 43 detects the sheet P, and this detection signal Is input to the control device 47.

  If the determination in step S1 is YES during feeding, it is determined whether or not it is the first sheet P (step S2). If this determination is YES, a pair of outer irregularities are determined. It is determined whether or not both the paper detection sensors 41 have detected the sheet P (step S3). If this determination is YES, the controller 47 determines that the currently fed sheet P is the size. It recognizes that the paper is large and is normally fed, and switches the irregular paper detection sensor from the inside to the outside (step S4). That is, taking in the detection signals of the pair of inner irregular paper detection sensors 43 is canceled, and only the detection signals of the pair of outer irregular paper detection sensors 41 are taken in, and the paper feeding state is continuously monitored.

  If the determination in step S3 is NO, it is determined whether or not only the outer irregular paper detection sensor 41 on the operation side (OPS) has detected the sheet P (step S5). In this case, the control device 47 considers that an irregular paper jam has occurred on the outer anti-operation side (NOPS) due to the twist of the sheet P (step S6), and stops the feeder driving device 49, Alternatively, the irregular paper is removed from the regular conveyance route and discharged to a separate paper stack.

  If the determination in step S5 is NO, the process proceeds to step S7, where it is determined whether or not only the non-operation side (NOPS) outside irregular paper detection sensor 41 is detecting the sheet P, If this determination is YES, the control device 47 regards that an irregular paper jam has occurred due to the twist of the sheet P on the outer operation side (OPS) (step S8), and stops the feeder driving device 49. Alternatively, the irregular paper is removed from the regular conveyance route and discharged onto a separate paper stack.

  If the determination in step S7 is NO, it is determined whether both of the pair of inner irregular paper detection sensors 43 have detected the sheet P (step S9). If this determination is YES, control is performed. The apparatus 47 recognizes that the currently fed sheet P is small in size and is normally fed, and switches the irregular paper detection sensor from the outside to the inside (step S10). That is, the detection of the detection signals of the pair of outer irregular paper detection sensors 41 is canceled, only the detection signal of the pair of inner irregular paper detection sensors 43 is acquired, and the paper feeding state is continuously monitored.

  If the determination in step S9 is NO, it is determined whether only the operation side (OPS) inner irregular paper detection sensor 43 has detected the sheet P (step S11), and this determination is YES. In this case, the control device 47 considers that an irregular paper jam has occurred on the inner anti-operation side (NOPS) due to the twist of the sheet P or the like (step S12), and stops the feeder driving device 49, Alternatively, the irregular paper is removed from the regular conveyance route and discharged to a separate paper stack.

  If the determination in step S11 is NO, the process proceeds to step S13, where it is determined whether or not only the non-operation side (NOPS) inner irregular paper detection sensor 43 has detected the sheet P, If this determination is YES, the control device 47 regards that an irregular paper jam has occurred due to the twist of the sheet P on the inner operation side (OPS) (step S14), and stops the feeder driving device 49. Alternatively, the irregular paper is removed from the regular conveyance route and discharged onto a separate paper stack.

  If the determination in step S13 is NO, the sheet P is jammed and not fed to the feeder board 9, and the control device 47 regards it as a feeder board jam and stops the feeder driving device 49. (Step S15).

  Thus, in this embodiment, when the pair of outer irregular paper detection sensors 41 detects the front end of the sheet P that has reached the mouth plate 33 via the feeder board 9, the large-sized sheet P is fed. For example, when the control device 47 captures only the detection signals of the pair of outer irregular paper detection sensors 41, while only the pair of inner irregular paper detection sensors 43 detects the front end of the sheet P, the small-size sheet is detected. Assuming that P has been fed, the detection signal of the pair of outside irregular paper detection sensors 41 is canceled, and the control device 47 captures only the detection signal of the pair of inside irregular paper detection sensors 43.

  In this way, since each end of the sheet P having a different size is detected, the sheet P can be detected with high accuracy without making a detection error, and an irregularity in which twist or the like occurs. It is possible to provide a sound printed matter without failing to overlook the paper.

  In addition, since the control device 47 automatically controls the capture of the signals of the outer and inner irregular paper detection sensors 41 and 43, troublesome manual switching or forgetting to switch by the operator can be solved.

  In this embodiment, when the pair of outer and inner irregular paper detection sensors 41 and 43 detect the sheet P, the acquisition of the detection signals of the pair of inner irregular paper detection sensors 43 is canceled and the pair The control device 47 captures only the detection signal of the outer side irregular paper detection sensor 41 of the outer side, but the detection signal of the pair of inner side irregular paper detection sensors 43 as well as the detection signal of the pair of outer side irregular paper detection sensors 41 is also received. It is also possible for the control device 47 to take in. In this case, there is a merit that it is possible to detect that the sheet P is irregular when the center of the sheet P is broken due to tearing or the like and cannot be detected by the outer irregular sheet detection sensor 41.

  The present invention is useful when detecting an irregular paper jam in a sheet-fed printing press.

FIG. 4 is a control block diagram of a paper feeding device. It is a flowchart explaining switching control of an irregular paper detection sensor. It is a top view of a feeder part. It is a schematic block diagram of a sheet-fed printing press.

Explanation of symbols

3 Printing unit 9 Feeder board 11 Paper feeder 33 Port plate 41 Outside irregular paper detection sensor (outside irregular paper detection means)
43 Inner irregular paper detection sensor (inner irregular paper detection means)
47 Control device (control means)
P sheet of paper

Claims (2)

A sheet feeding device for a sheet-fed printing machine that continuously feeds a plurality of sheets one by one to a printing unit through a feeder board,
A mouth plate which is fixed and arranged close to the downstream end of the feeder board so as to be continuous;
A pair of outer irregular paper detection means fixedly arranged on the mouth plate at an interval so as to correspond to both ends in the direction intersecting the conveyance direction of the maximum width sheet used in the printing press;
The outer side irregular paper detection means is connected to the inside of the pair of outer irregular paper detection means so as to correspond to the inside of both ends in the direction intersecting the conveyance direction of the smallest width sheet used in the printing press. A pair of inner irregular paper detection means fixedly arranged on the mouth plate with an interval so as to be positioned on a straight line;
When each of the pair of outer and inner irregular paper detection means detects the front end of the sheet that has reached the mouth plate, at least the detection signal of the pair of outer irregular paper detection means is taken in, while the mouth plate When the pair of outer irregular paper detection means does not detect the front edge of the sheet that has reached the position, and the pair of inner irregular paper detection means detect both, the detection signal of the pair of outer irregular paper detection means And a control means for controlling the taking-in of the signal so as to cancel the take-in and to take in only the detection signal of the pair of inside irregular paper detecting means.   When the pair of outer and inner irregular paper detection means both detect the front end of the sheet that has reached the mouth plate, the control means includes a detection signal of the pair of inner irregular paper detection means. 2. A sheet feeding device for a sheet-fed printing press according to claim 1, wherein the feeding is controlled.

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