JP2012210993A - Paper feeder and printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeder capable of reliably arranging paper sheets in a conveying direction even when the paper sheets are stacked with deviation in the paper feeder, then, capable of appropriately feeding the paper sheets, and to provide a printing machine.SOLUTION: A screw member 62 is provided in a feeder head 60, rotatably, but not movably in an axial direction. The screw member 62 is screwed with an elevating block 61. The elevating block 61 is provided on the feeder head 60 such that it can move up and down, but it cannot rotate, and the elevating block 61 moves up and down with rotation of the screw member 62. A tension pulley 63 is secured to the elevating block 61. The tension pulley 63 is installed such that it can be attached to and detached from a rear chain 53.

Description

  The present invention relates to a paper feeding device that is mounted on a printing press and on which a pallet on which sheets are stacked is placed.

  A pallet on which sheets are stacked is placed on a sheet feeding device mounted on the printing press, and sheets are supplied from the sheet feeding device into the printing press via a feeder board. The sheets stacked on the sheet feeding device are supplied one by one from the upper end to the feeder board. In order to keep the upper end position of the sheet supplied to the feeder board at a constant height, the sheet feeding base of the sheet feeding device is gradually raised by winding up the lifting chain as the sheet decreases. It is configured as follows. Further, the paper feeding device is provided with a feeder head having a football that sucks and holds the uppermost sheet and supplies it to the feeder board. The feeder head is provided with a height position detecting piece so as to be swingable. In order to detect the upper end position of the sheet, the height position detection piece is configured to be able to abut on the upper surface of the rear end portion in the sheet transport direction from above the sheet. The height position detection piece is always urged downward by the feeder head, and generates a detection signal by swinging downward as the number of sheets decreases. Therefore, the hoisting amount of the lifting chain is controlled by this detection signal.

  Here, the placement of the sheets on the sheet feeding device is performed by carrying a pallet loaded with sheets by a hand lift or the like. A pallet loaded with sheets may be several hundred kilometers, and it is not easy to properly arrange sheets and place them on a sheet feeding device. For this reason, the sheet feeding table of the sheet feeding device on which the sheets are stacked is divided into an upper plate and a lower plate, and the upper plate is slid to the front side in the sheet conveying direction with respect to the lower plate. A technique is used in which the sheet is press-contacted to a front contact for positioning in the transport direction. For example, Patent Document 1 discloses such a sheet feeding device.

Japanese Utility Model Publication No. 6-37238

  According to the paper feeder disclosed in Patent Document 1, although the sheets can be aligned to some extent in the transport direction, there are cases where it is not possible to cope with them. FIG. 4A is a schematic side view of the sheet feeding device 100. The four bolts 102 installed on the sheet feeding table 101 are arranged in the sheet width direction (direction perpendicular to the transport direction). One end of the rear chain 103 provided in two places and the front chain 104 provided in two places in the width direction are fixed. The other ends of the rear chain 103 and the front chain 104 are linked to a motor (not shown), and the paper feed table 101 is configured to move up and down with four chains by forward and reverse driving of the motor.

  A pallet 105 on which sheets P are stacked is placed on the sheet feeding table 101. In FIG. 4A, the upper front end of the sheet P is in contact with the front guide (front pad) 106, but as shown in the figure, it is loaded in a wavy state before and after in the conveying direction. However, no matter how much the paper feed table 101 is slid forward, the sheet P at the center in the height direction is displaced rearward, and there is a problem that proper paper feeding cannot be performed.

  FIG. 4B is a schematic side view of the sheet feeding device 100. The rear portion of the sheet P is in a suspended state. This is a phenomenon that is likely to occur on the sheet P placed to print the back side of the sheet printed in the center from the front side in the transport direction. It becomes. In this case, since the rear portion of the sheet P hangs down, the above-described height position detection piece swings greatly downward to generate a detection signal, and the paper feed table 101 is raised more than necessary. Therefore, the upper end position of the sheet is not properly maintained, and a plurality of sheets P may be transported to the feeder board at once, and there is room for improvement.

  The present invention has been made to solve such a problem, and an object of the present invention is to reliably align sheets in the transport direction even if the sheets of the sheet feeding device are stacked in a shifted state. Therefore, it is an object of the present invention to provide a paper feeding device and a printing machine that can feed paper properly.

  In order to achieve the above object, the present invention stacks the sheets P so as to be able to move up and down, and tilts the sheets P forward in the conveying direction in the sheet feeding device 20 capable of feeding and conveying from the uppermost sheet P. Forward tilting means 57, 61, 62, 63 are provided.

  The sheet feeding device 20 according to the present invention includes a sheet feeding table 51 on which sheets P are stacked, and elevating means 53 and 54 that are provided in the front and rear direction of the sheet and hold the sheet feeding table 51 so as to be movable up and down. The forward tilting means 57, 61, 62, 63 are characterized in that the sheet P is tilted forward by changing the holding height of the front and back of the paper feed table 51 by the lifting means 53, 54. To do.

  Further, the sheet feeding device 20 according to the present invention is characterized in that the forward tilting means 57, 61, 62, 63 can adjust the forward tilt of the sheet P.

  Further, the printing machine according to the present invention includes a sheet feeder 20 according to claims 1 to 3, a feeder board 5 that conveys a sheet P fed from the sheet feeder 20, and the feeder board 5. A printing unit 30 for printing the conveyed sheet P and a paper discharge unit 40 for discharging the printed material Q printed by the printing unit 30 are provided.

  According to the present invention, it is possible to obtain a paper feeding device capable of reliably aligning sheets in the transport direction and performing appropriate paper feeding.

  In addition, it is possible to obtain a paper feeding device that can reliably arrange sheets in the transport direction and perform proper paper feeding with a simple configuration.

    In addition, it is possible to adjust the degree of alignment of the sheets P and to obtain a paper feeding device that can perform proper paper feeding.

  In addition, a printing press provided with the paper feeding device as described above can be obtained.

It is a figure which shows schematic structure of one Embodiment of the printing machine provided with the paper feeder which concerns on this invention. 1 is a schematic side view schematically showing a paper feeding device according to the present invention. It is a schematic side view which shows typically the paper feeder of the other Example which concerns on this invention. It is a schematic side view which shows the conventional paper feeder typically.

  Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an embodiment of a printing press provided with an ink supply device according to the present invention. In FIG. 1, parts having substantially the same configuration and action are denoted by the same reference numerals.

  The printing press shown in FIG. 1 includes a paper feeding device 20, a printing unit 30, and a paper discharge unit 40. The paper feeding device 20 can supply a sheet P (here, printing paper) to the printing unit 30 via the feeder board 5. The printing unit 30 can print the sheet P supplied from the paper feeding device 20, and includes a plurality of printing units (here, four printing units 30a to 30d). Further, the paper discharge unit 40 can discharge the printed matter Q printed by the printing unit 30. In this printing machine, the sheet P is supplied from the paper supply device 20 to the printing unit 30, and the supplied sheet P is printed by the printing units 30 a to 30 d in the printing unit 30, and then the printing is performed. The printed matter Q is discharged by the paper discharge unit 40.

  The paper feeding device 20 can store a plurality of sheets P, and includes a main feed roller 21 in the vicinity where the upper end of the stored sheets P is located. Then, the sheet P can be drawn one by one from the uppermost sheet P, and the drawn sheet P can be conveyed in the direction of the arrow Z toward the printing unit 30 via the feeder board 5. Thereby, the sheet P can be supplied to the printing unit 30. Details of the paper feeder 20 will be described later.

  Each of the printing units 30a to 30d of the printing unit 30 includes the plate cylinder 1, the rubber cylinder 2, and the impression cylinder 3 as a set of main components. 4a in the printing unit 30a is a paper feed cylinder, and 4 in the printing units 30b to 30d is a transfer cylinder.

  In each of the printing units 30a to 30d, a printing plate (not shown) is disposed on the plate cylinder 1. Ink and water are supplied to the plate from an ink roller group and a water supply device (not shown), and the ink is transferred to the rubber cylinder 2 according to the plate. The ink transferred to the rubber cylinder 2 is further transferred to the sheet P conveyed while being sandwiched between the rubber cylinder 2 and the impression cylinder 3. As a result, printing can be performed corresponding to the plates provided on the sheet P supplied from the sheet feeding device 20.

  Each of the printing units 30a to 30d prints a color print image on the sheet P with four printing inks of black (K), cyan (C), magenta (M), and yellow (Y). To do. Thus, in the printing unit 30, the sheet P is configured with a plurality of different basic colors (here, four colors of black (K), cyan (C), magenta (M), and yellow (Y)). A color print image is printed.

  The paper discharge unit 40 includes a transport unit 41 and a storage unit 42. In the paper discharge unit 40, the printed product Q conveyed by the impression cylinder 3 of the printing unit 30d is held at the leading end portion by a holding unit (not shown) of the conveyance unit 41, and on the substantially lower side surface of the conveyance unit 41 in the drawing. Then, it is conveyed to the accommodating portion 42. The storage unit 42 can store the printed material Q that has been transported by the transport unit 41.

  In FIG. 2, four bolts 52 planted on the paper feed tray 51 of the paper feeder 20 are provided with two rear chains 53 provided in two places in the sheet width direction (direction perpendicular to the transport direction). Similarly, one end of the front chain 54 provided at two places in the width direction is fixed. The rear chain 53 is connected to a motor (not shown) through sprockets 57 and 58, and the front chain 54 is connected to a motor (not shown) through a sprocket 58. Configured to move up and down with a chain.

  A pallet 55 on which sheets P are stacked is placed on the paper feed tray 51. In addition, a front guide 56 is provided in front of the sheet feeding table 51 in the conveyance direction, and the front end of the sheet P is brought into contact with the front guide 56 so that the sheet P is positioned in the conveyance direction. .

  The paper feeder 20 is provided with a feeder head 60 having a soccer (not shown) that sucks and holds the uppermost sheet on the paper feeder 51 and supplies it to the feeder board 5. The feeder head 60 is provided with a swingable height position detecting piece (not shown) that can be contacted from above the sheet P on the upper surface of the rear end of the sheet P in the transport direction. The height position detection piece is always urged downward by the feeder head 60, and generates a detection signal by swinging downward as the sheet P decreases. Therefore, the amount of winding of the chains 53 and 54 is controlled by this detection signal, and the upper end position of the sheet P is kept constant.

  As shown in the drawing, the feeder head 60 bulges downward, the screw member 62 is rotatable, and is provided so as not to move in the axial direction. The screw member 62 is screwed to the lifting block 61. The lifting block 61 is provided on the feeder head 60 so as to be vertically movable and non-rotatable, and is vertically moved by the rotation of the screw member 62. A tension pulley 63 is fixed to the lifting block 61. The tension pulley 63 is installed so as to be able to contact and separate from the rear chain 53.

  The operation of this embodiment will be described. The operator places the pallet 50 on which the sheets P are stacked on the paper feed tray 51. Then, the screw member 62 is rotated, and the elevating block 61 and the tension pulley 63 are lowered. The lowered tension pulley 63 abuts and presses the rear chain 53 from above, and the rear chain 53 is in a state as indicated by a two-dot chain line in FIG. Then, the rear side of the paper feed tray 51 rises, and the paper feed tray 51 and the sheet P take a forward tilting posture that is tilted forward in the transport direction. Then, the sheet P comes into contact with the front guide 56, and the sheet P is positioned in the transport direction. This forward inclination can be arbitrarily adjusted by the rotation of the screw member 62. In FIG. 2, only the forward tilted state of the paper feed tray 51 is shown by a solid line.

  When printing is started in this state, the sheets P are conveyed one by one from the upper end of the sheet P onto the feeder board 5 by soccer (not shown) of the feeder head 60. The sheet P is properly fed by contacting the front guide 56. As shown in FIG. 4A, when the sheets P are stacked in a undulating state in the front-rear direction, even if the sheet feeding table 51 is tilted forward, the sheet P has its own weight. The sheet P below the center in the height direction does not immediately come into contact with the front guide 56. However, since the sheet P in the vicinity of the upper end does not have a large weight, the sheet P comes into contact with the front guide 56 due to the forward tilt of the sheet feed table 51, and can be fed properly when transported to the feeder board 5.

  When the sheet P is tilted forward, the paper feed table 51 may be tilted directly by another driving means. However, as in this embodiment, the rear chain 53 that is the lifting means is the forward tilting means. The configuration in which the paper feed platform 51 and the sheet P are tilted forward in conjunction with the operations of the elevating block 61, the screw member 62, and the tension pulley 63 has a simple configuration and the sheet P has a forward tilt and proper feeding. Paper can be made.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the summary of this invention. For example, in the embodiment shown in FIG. 2, the rear chain 53 is pressed by the tension pulley 63. However, as shown in FIG. It is good also as a structure which inclines P forward. In this case, as in the embodiment of FIG. 2, a lifting block that is screwed into the screw member 62 provided on the feeder head 60 and fixed to the sprocket 57 is required. In FIG. 3, the feeder head 60 and the lifting block 61 are not shown.

  In the above-described embodiment, the sheet feeding table 51 is tilted forward and the sheet P is positioned in the conveyance direction. However, the present invention is not limited to this. Alternatively, the sheet P may be tilted forward by raising only the rear side of the paper feed tray 51.

  Further, in the above-described embodiment, the sheet P is tilted forward by lifting the back of the sheet feed table 51. However, by lowering the front of the sheet feed table 51, the sheet P is tilted forward. It is also possible to make it.

  In the above-described embodiment, the sheet offset printing machine is used. However, the present invention is not limited to this, and a gravure printing machine or a flexographic printing machine may be used as long as the printing machine uses a sheet feeding device. It may be.

  The paper feeding device and the printing press according to the present invention are extremely useful in a paper feeding device and a printing press that feed and convey sheets.

  DESCRIPTION OF SYMBOLS 20 ... Paper feeder, 21 ... Main feed roller, 51 ... Paper feed stand, 52 ... Bolt, 53 ... Rear chain, 54 ... Front chain, 55 ... Pallet, 56 ... Front guide, 57 ... Sprocket, 58 ... Sprocket, 60 ... Feeder head, 61 ... Elevating block, 62 ... Screw member, 63 ... Tension pulley

Claims (4)

  A sheet feeding device capable of stacking sheets so as to be moved up and down, and feeding and conveying the sheets from the uppermost sheet, provided with forward tilting means for tilting the sheets forward in the conveying direction. .   The sheet feeding device includes a sheet feeding table on which sheets are stacked, and an elevating unit that is provided in the front and rear of the conveyance direction and holds the sheet feeding table so that the sheet can be moved up and down. The sheet feeding device according to claim 1, wherein the sheet is tilted forward by changing a holding height of the sheet feeding table before and after.   3. The sheet feeding device according to claim 1, wherein the forward tilting means is capable of adjusting a forward tilting state of the sheet.   The sheet feeding device according to claim 1, a feeder board that conveys a sheet fed from the sheet feeding device, a printing unit that prints a sheet conveyed from the feeder board, and the printing A printing machine comprising: a paper discharge unit that discharges a printed matter printed by the unit.

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