JP2017081707A - Sheet feeding part for sheet-fed printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding part of a sheet-fed printer that can correct skew of a print sheet fed to a front lay device to transport the print sheet accurately in a sheet-fed printer.SOLUTION: The sheet feeding part of a sheet-fed printer includes: measuring devices 14a, 14b for grasping skew relative to a transportation direction of the print sheet 1; and suction belts 11a, 11b for changing the transportation direction of the print sheet 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheet feeding unit of a sheet-fed printing machine that corrects skew of a printing sheet sent from a feeder board to a front-applying device in a sheet-fed printing machine and can accurately convey the printing sheet.

  A printing apparatus of a sheet-fed printing press includes a paper feeding unit, a printing unit, and a paper discharge unit. The printing sheets stacked on the sheet feeding table of the sheet feeding unit are supplied to the printing unit by the sheet feeding device, and after the predetermined printing is performed by the printing unit, the printing sheets are supplied to the sheet discharging unit. Printing paper is stacked on top of each other.

  Among them, the sheet feeding device and sheet feeding method of the sheet feeding machine sheet feeding unit will be described in detail. As shown in FIG. 4, the printing sheets 1 stacked on the sheet feeding table 13 are fed. The separator device 2 constituting the device is picked up one by one by air from the top in order, and the printing paper 1 is continuously fed to the paper feed roller 3.

  The paper feed roller is composed of a feed roller 12 that is rotationally driven and a paper feed roller 3 that contacts and separates from the feed roller 12 at a timing. When the printing paper 1 is supplied to the feed roller 12, the paper feeding roller 3 descends in synchronization with the printing paper 1, the printing paper 1 is pressed against the feed roller 12, and the printing paper 1 is fed at the peripheral speed of the feed roller 12. Sent out.

  The feeder board 4 is supplied with the succeeding printing paper 1 partially stacked below the preceding printing paper 1. On the feeder board 4, the printing paper 1 is conveyed in the direction of the printing unit by the conveyance belt 6, and the leading end portion of the printing paper 1 is positioned by abutting against the front application device 7. Further, as shown in FIG. 5, 3 mm to 5 mm is drawn in the direction perpendicular to the conveyance direction by one of the pair of horizontal needle devices 8 provided in the direction perpendicular to the conveyance direction (the printing paper is drawn in). Amount x), the printing paper 1 is positioned in the width direction by contacting the horizontal needle device 8. Thereafter, the printing paper is picked up by a swing gripper (not shown) and conveyed to a printing unit (not shown).

  On the other hand, printing paper skewed by the end of the printing paper being caught in a slight gap or groove such as a joint on the feeder board, such as the gap y on the feeder board in FIG. As in the case of the sheet 9, there is a case in which a deviation amount z in the conveyance direction of the printing paper of about 1 mm occurs in the vicinity of the front application device 7, and the printing paper may not contact the front application device 7. In such a state, an abnormal paper feeding state in which the printing paper is not in contact with the front application device is entered, and the paper feeding device stops. Once the paper feeder stops, there is a problem that the worker needs to perform correction work each time, which not only increases the load for the worker but also reduces the operating rate of the printing press. .

  To deal with such problems, a technique for changing the speed of the conveyor belt on the feeder board according to the size of the printing paper is known as a technique for dealing with delay, advancement, or skew of the printing paper sent to the feeder board. (See Patent Document 1).

  For example, the printing paper sent from the paper feed tray to the feeder board is sucked and stopped by the suction mechanism 16 as shown in FIG. A paper feeding unit and a paper feeding method of a printing press are known (see Patent Document 2).

  However, the method of Patent Document 1 has a problem that it cannot cope with printing paper that is suddenly skewed.

  Further, in the method of Patent Document 2, it is necessary for an operator to correct the skewed printing paper only by sucking the printing paper by the suction mechanism 16 and stopping it. Further, if the suction mechanism 16 can be rotated, a paper deviation that is a delay or advance in the conveyance direction of the printing paper can be corrected, but a deviation in a direction orthogonal to the conveyance direction cannot be corrected. In addition, there is a problem that the paper feeding device stops due to an abnormal paper feeding state such as the printing paper 10 newly skewed in the horizontal needle device 8 climbs.

JP 2003-48643 A JP 2013-199370 A

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problem, and an oblique belt with respect to the conveyance direction of the printing paper generated in the vicinity of the front application device is provided, and an adsorption belt that changes the conveyance direction of the printing paper is provided. The sheet feeding unit of a sheet-fed printing press that can accurately convey the printing paper is provided.

  As a result of intensive studies in view of the above, the present inventor has invented the sheet feeding unit of the sheet-fed printing press of the present invention.

  That is, the present invention relates to a measurement apparatus for grasping skew with respect to the conveyance direction of the printing paper in a sheet-fed printing press including a paper feeding unit including a paper feeding device that continuously conveys the supplied printing paper, This is a sheet feeding unit of a sheet-fed printing press provided with a suction belt that changes the conveyance direction of printing paper.

  By calculating the skew with respect to the conveyance direction of the printing paper with a measuring device and correcting it with a suction belt that changes the conveyance direction of the printing paper, the printing paper can be conveyed with higher accuracy than in the prior art, and correction work by the operator can be performed. There is no need to do this, and the operating rate of the printing press can be improved.

It is a top view which shows the paper feed part concerning one Embodiment of this invention. It is a side view of the paper feed unit according to an embodiment of the present invention. It is a top view which shows the behavior of the printing paper concerning one Embodiment of this invention. FIG. 6 is a side view illustrating the behavior of printing paper in a paper feeding unit. FIG. 6 is a plan view illustrating the behavior of printing paper in a paper feeding unit. It is a top view which shows the aspect of the printing paper which skewed newly in the front application apparatus vicinity. It is a top view which shows the aspect which the printing paper which skewed newly generate | occur | produced in the vicinity of the front application apparatus got on the horizontal needle apparatus.

  Hereinafter, the sheet feeding unit of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a paper feed unit according to an embodiment of the present invention. In the upper part between the feeder board 4 and the front-applying device 7, a measuring device 5 is installed to grasp the skew of the printing paper newly induced in the vicinity of the front-applying device. Further, suction belts 11a and 11b for changing and adjusting the position of the printing paper in the direction orthogonal to the transport direction are installed between the feeder board and the front-applying device.

  When the installation positions of the measuring device 5 and the suction belts 11a and 11b are viewed from the side, an aspect as shown in FIG. 2 is obtained. In conjunction with FIG. 1, the suction belts 11 a and 11 b include photoelectric tube sensors 14 a and 14 b for detecting the leading end of the printing paper, air suction devices 15 a and 15 b (not shown) using fans, a belt driven by a motor, It is composed of When the phototube sensor detects that the leading edge of the printing paper has reached the belt, the air suction device is operated and the printing paper is sucked and conveyed to the belt. Either one of the suction belts 11a and 11b operates to change the conveyance direction of the printing paper. The suction device is not limited to the air suction device as long as the device can be easily operated and stopped even during high-speed printing, and the suction force and the suction force can be easily adjusted.

  The manner in which the skew of the printing paper is corrected will be specifically described with reference to the plan view of FIG. 3 showing the behavior of the printing paper of the paper feeding unit according to the embodiment of the present invention. The measuring device 5 includes a CCD camera provided in a pair on the printing machine operation side and the driving side in a direction perpendicular to the conveyance direction of the printing paper, and an arithmetic device for calculating the skew amount of the printing paper measured by the CCD camera ( (Not shown). When the printing paper 9 is sent from the feeder board 4 to the front application device 7, the CCD camera determines the distance from the front application device 7 on the printing press operation side and the driving side to the end of the printing paper 9 in the conveying direction. taking measurement. Next, the arithmetic unit subtracts the measured value obtained from the CCD camera on the printing press drive side from the measured value obtained from the CCD camera on the printing press operation side, thereby conveying the printing paper as the skew amount of the printing paper. A direction shift amount z is calculated.

  When the value is a positive number, the printing paper 9 is delayed on the printing press operation side with respect to the conveyance direction, and when the value is a negative number, the printing paper 9 is delayed on the printing press drive side with respect to the conveyance direction. Yes. That is, when the value of the deviation amount z is a positive number, the belt of the suction belt 11a corrects the skew of the printing paper by sucking and conveying the belt in the conveyance direction of the printing paper by the amount of the deviation amount z. When the value of z is a negative number, the belt of the suction belt 11b corrects the skew of the printing paper by sucking and conveying the belt in the conveying direction of the printing paper by the amount of deviation z.

  For example, the skewed printing paper 9 has a positive value for the shift amount z because the printing press operation side is delayed with respect to the transport direction. Therefore, when the photoelectric tube sensor 14a detects that the leading end portion of the printing paper 9 has reached the suction belt 11a, the suction belt 11a is sucked and conveyed in the printing paper conveyance direction by the amount z of the deviation, and the printing paper The skew is corrected.

  By using the means described so far, the printing paper conveyed to the vicinity of the front application device 7 as shown in FIG. 3 abuts on the front application device 7 without skew and can be positioned with high accuracy. Further, by pulling 3 mm to 5 mm in a direction perpendicular to the conveying direction by the horizontal needle device 8 and coming into contact with the horizontal needle device 8, it is possible to accurately position the printing paper in the width direction.

  Since the sheet-fed printing press uses printing paper of various sizes, it is preferable that the measuring device 5 and the suction belts 11a and 11b can be moved to arbitrary positions.

1 Printing paper 2 Separator device 3 Feed roller 4 Feeder board 5 Measuring device (CCD camera)
6 Conveying belt 7 Front application device 8 Horizontal needle device 9 Skewed printing paper 10 Printing paper 11a, 11b newly skewed Adsorption belt 12 Feed roller 13 Paper feed bases 14a, 14b Photoelectric tube sensors 15a, 15b Air suction device 16 Adsorption mechanism x Amount of printing paper drawn y Gap on feeder board z Amount of deviation in printing paper conveyance direction

Claims (1)

  In a sheet-fed printing press having a paper feeding unit including a paper feeding device that continuously feeds supplied printing paper, a measuring device that grasps skew with respect to the printing paper feeding direction, and a printing paper feeding direction. Feeder of sheet-fed printing press equipped with variable suction belt.