JP4175359B2 - Paper jam prevention method and apparatus for theta for printing press - Google Patents

Description

  The present invention particularly relates to a method and apparatus for preventing paper jamming of a spliced cut sheet that moves on a sheet feeding unit of a printing machine.

  A sheeter of a printing machine includes a conveyance unit that cuts a printing web supplied from the printing machine to a predetermined length and conveys a cut sheet (sheet) in a sheet state to a stack unit. As shown in FIG. 6, the transfer unit 100 includes a theta including a lower high-speed transfer unit 120, a lower low-speed transfer unit 140, and an upper high-speed transfer unit 160. In such a theta, the cut sheet sandwiched between the upper and lower high-speed conveying means is conveyed, delivered to the lower low-speed conveying means 140, and supplied to the stack unit. By disposing the lower low-speed conveying means 140 at the front stage of the stack unit 108, the cut sheet conveyed at high speed can be decelerated and the cut sheet can be prevented from colliding with the opposite wall of the stack unit 108 and being bent. .

  In the theta having the transport unit 100 having such a configuration, when the cut sheet is delivered from the upper high-speed transport unit 160 to the lower low-speed transport unit 140, the sheet is transported by the upper high-speed transport unit 160 using a rotating arm called a snubber 200. While hitting the cut paper edge (rear edge) of the cut paper and pressing it against the conveying surface of the lower low-speed conveying means 140, the cut paper is struck against a roller called a squaring roll 220 while braking the cut paper. A method of decelerating and delivering the cut sheet to the lower low speed conveying means 140 has been adopted.

  However, according to the above-described method, there is a problem that when the cut sheet is pressed against the lower low-speed conveying unit 140, a pressing mark remains on the cut sheet. On the other hand, when the pressing pressure is weakened so as not to leave a pressing mark on the cut paper, the cutting of the cut paper is not sufficient, and when the paper hits the squaring roll 220, it is bent or bent. There was a problem.

  In view of the above situation, the applicant of the present application attaches a brush to the snubber, presses the cut paper with this brush, and sets the brush surface long with respect to the conveyance direction of the cut paper with a weak press. It is proposed that sufficient braking can be applied even if there is, and this is disclosed in Patent Document 1 and Patent Document 2.

According to the theta having such a configuration, even when the pressing force of the cut paper by the snubber is increased, no pressing mark remains on the cut paper. Further, when the pressing area of the brush is widened, it is possible to apply sufficient braking to the cut sheet even with a weak pressing force. For this reason, when a cut sheet hits a squaring roll, it does not fold or bend.
Japanese Patent Laid-Open No. 10-109805 JP 2000-16665 A

  In the case of the theta disclosed in Patent Documents 1 and 2, when the transport speed of the cut paper is increased by improving the transport speed of the cut paper that has been printed and cut together with the recent increase in the print speed, the Patent Document 1, In order to give a sufficient braking force to the cut paper with the technique disclosed in No. 2, it is necessary to take measures such as making the brush surface considerably long. On the other hand, when the brush surface is lengthened with respect to the conveyance direction of the cut sheet, there is a problem that the pressing position is shifted forward when the thick cut sheet is pressed. In view of this, there is a high-speed transport theta which includes a blower unit for cut paper above the transport unit and a suction unit below the transport unit, and suppresses pressing traces of the cut paper.

  By the way, in a printing press that is in operation, when the number of winding paper being fed decreases, the web winding device (hereinafter referred to as the old roll) and the new winding paper (hereinafter referred to as the new roll) are bonded by the splicing device. A roll of paper is exchanged by using a paster. In the splicing operation, the tip of the new roll is bonded to the old roll being fed with double-sided tape. When the spliced roll is cut, an overlapping portion is generated between the rear end portion of the old roll and the front end portion of the new roll as shown in FIG. In addition to the cut paper 110a in which the leading end of the new roll is bonded to the old roll with double-sided tape, the overlapping portion includes one of the cut sheets 110b, 110c, and 110d of the new roll and old roll that are not bonded to each other with double-sided tape. It may occur more than a cut.

When the cut sheet 110 having such an overlapping portion is sent to a transport unit having a blowing unit and a suction unit, the lower sheet a of the cut sheet 110 transported at a high speed as shown in FIG. The upper paper b that is sucked and decelerated by the suction means 240 installed at 140 but not bonded to the lower paper a is indicated by an arrow e from above the lower low-speed conveying means toward the lower low-speed conveying means. The downward flow generating means 260 that ejects a simple gas is fed ahead of the lower paper a and is displaced from the lower paper a. The lower paper a is pressed by the suction means by the brush 222 attached to the snubber 220a and is sucked by the suction means to be braked, but the rear end portion of the upper paper b that has been fed forward (upstream with respect to the transport direction). , The same shall apply hereinafter). Then, the cut sheets are successively conveyed to the lower low-speed conveying unit by the high-speed conveying unit, and are sandwiched between the rolled up upper paper b and the lower paper a moving on the lower low-speed conveying unit. Jamming) occurs. This paper jam occurs at a location where the cut paper that has been subjected to the cutting process moves at a high speed and shifts to the lower low-speed transport means, so that the paper jam occurs instantaneously continuously. Once a paper jam occurs in this way, the theta for the printing press must be stopped, and it takes time for the operator to remove the cut paper from the conveying means, and the operation of the normal printing press is resumed. Had a problem of taking time for inspection and maintenance.
In order to improve the above-described conventional problems, an object of the present invention is to prevent paper jamming of a spliced cut paper conveyed by a printing machine sheeter.

Paper jam prevention method for a printing press for theta of the present invention, two were splicing between the old roll and the new roll to be conveyed at high speed by the transport unit of the printing machine theta with the upper high-speed transport means and lower slow conveying means held down to the lower low-speed conveying means by downflow generating means cut sheets of overlaid paper jam of the cut sheet is pressed against the suction means having a rear end portion of the cut sheet on the lower surface of the lower low-speed conveying means by snubber In the paper jam prevention method for a printing machine sheeter for preventing printing, a signal for paper splicing between webs is detected, and the transport speed of the cut paper transported by the upper high-speed transport means is changed from a high speed state to a low speed state. in the displacement position to move to, based on the detection signal, in accordance with the timing at which the cut sheet was paper splicing is transported, previously in rolling contact with the paper pressing roll to the tip portion of the cut sheet It is characterized in that presses said cut sheet of a predetermined number of back and forth around the cut sheet 2 ply that splicing the lower low-speed conveyor unit.

The sheet jam prevention device for a printing machine sheeter according to the present invention includes two sheets joined between an old roll and a new roll which are conveyed at high speed by a conveying section of a printing machine sheeter provided with an upper high-speed conveying means and a lower low-speed conveying means. held down to the lower low-speed conveying means by downflow generating means cut sheets of overlaid paper jam of the cut sheet is pressed against the suction means having a rear end portion of the cut sheet on the lower surface of the lower low-speed conveying means by snubber In a paper jam prevention apparatus for a printing machine sheeter for preventing printing, a signal detecting means for performing paper splicing between webs, and the cut which is downstream of the snubber and which is conveyed by the upper high-speed conveying means in the displacement position in which the transport speed of the paper is shifted from the high speed state to the low speed state, on the basis of the detection signal of said detecting means, in rolling contact with the paper pressing roller at the tip of the cut sheet that splicing It is characterized in that the cut sheet of a predetermined number of back and forth about the two-ply cut paper having serial web splicing with a, a paper pressing means for pressing the lower low-speed conveying means.
In this case, the paper pressing means is characterized in that a paper pressing roll that comes into contact with the cut paper can be brought into contact with or non-contacted with the cut paper surface that has been spliced by expansion and contraction of a cylinder rod.

  The paper pressing means is attached to a swing arm pivotally supported by a frame, faces the lower transport means, presses the swing arm, and presses the swing arm. A spring mechanism for bringing the presser roll into contact with the cut paper surface, and a cylinder mechanism for rotating the shaft around the swing arm to separate the paper presser roll from the cut paper are provided.

  According to the present invention configured as described above, based on the detection signal of the splicing, the overlapping portion of the splicing, that is, the overlapping portion of the overlapping portion is matched with the timing at which the two non-adhered cut sheets are conveyed. The upper sheet of the cut sheet can be pressed onto the conveying unit by the sheet pressing unit to prevent the upper sheet from being fed forward by the blower unit, and the deviation from the lower sheet can be suppressed. As a result, it is possible to effectively prevent a paper jam occurring between the upper paper and the lower paper without the upper paper that has been fed forward being greatly swollen by the snubber. Further, it is possible to extend the operation time of the printing press that has been lost due to the stoppage of the printing press due to a paper jam or the subsequent adjustment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a sheet jam prevention method and apparatus for a printing machine according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 3 is a schematic block diagram of the paper jam prevention device. As shown in the drawing, the printing web is conveyed from the splicing device 50 provided in the paper feeding unit of the printing web to the printing machine 60, and the printing web printed by the printing machine 60 is conveyed to the theta 70. Cut sheets cut by the theta 70 are stacked on a stack unit (not shown). The paper jam prevention device 80 is mainly composed of the paper pressing unit 10 and the control unit 42 attached to the transport unit of the theta 70.

FIG. 4 is a partially enlarged view of the conveyance unit of the theta for a printing press. As shown in the drawing, the lower low speed conveying means 12 of the theta conveying portion to which the paper jam prevention device according to the embodiment is attached is configured to include a snubber 90, a suction means 92, and a downward flow generating means 94.
The snubber 90 is a braking unit that peels off a sheet that is stuck to the upper high-speed conveyance unit 13 and delivers the sheet to the lower low-speed conveyance unit 12 and applies braking to the cut sheet. Brush fibers 90d are planted in the snubber 90. The brush fiber 90d is set to such a length that the brush tip presses the lower low-speed conveying means 12 when the snubber 90 is driven to rotate. The snubber 90 strikes the trailing edge of each cut sheet and presses it to the lower low-speed conveying means 12 in accordance with the cut sheet conveyance speed. By such an operation, the cut sheet can be delivered to the lower low-speed conveying means 12 and the cut sheet to be conveyed can be braked.

The suction means 92 is provided on the lower surface of the endless transport belt 12a constituting the transport surface of the lower low speed transport means 12, and a suction port 92a is provided at a position where the cut paper is pressed by the snubber 90. In general, an energy absorbing plate 93 is provided at the cut paper pressing position of the snubber 90 and is configured to receive the pressing force by the snubber 90. The suction unit 92 configured as described above sucks the gas from the suction port 92a, sucks the rear end portion of the cut sheet pressed against the lower low-speed transport unit 12 by the snubber 90, and brakes the cut sheet.
The downflow generation means 94 is provided downstream of the snubber 90, blows a gas such as air from the upper high-speed conveyance means 13 toward the lower low-speed conveyance means 12, and cuts the cut sheet conveyed to the lower low-speed conveyance means 12. It suppresses fluttering.

  FIG. 1 is a side view of the paper pressing unit according to the embodiment. FIG. 2 is a plan view of the paper pressing unit according to the embodiment. As shown in FIG. 1, the paper presser 10 which is the main component of the paper jam prevention device shifts from a high speed state where the cut paper 11 cut by the cutting portion becomes a displacement position of the transport speed of the transport means to a low speed state. The lower low-speed conveying means 12 is provided. Specifically, as shown in FIG. 4, it is provided on the downstream side of the downward flow generating means 94. Further, as shown in FIG. 2, a pair of shaft receivers 14 are formed on the upper surface of the lower low-speed transfer means 12 at both ends in the direction orthogonal to the lower low-speed transfer means. The shaft 16 is installed so as to pass perpendicularly to the direction. The shaft 16 is provided with a plurality of paper pressing means 10 with arbitrarily set intervals.

The paper pressing means 10 is mainly composed of a paper pressing roll 18 that comes into contact with the cut paper, a spring mechanism 28 that makes the paper pressing roll 18 contact the cut paper surface, and a cylinder mechanism that separates the paper pressing roll 18 from the cut paper. It is said.
As shown in FIG. 1, the paper pressing roll 18 is attached to the tip of a swing arm 20 that is rotatably attached to the shaft 16. The swing arm 20 is formed by facing two flat plates, a fixed shaft 22 is attached to the tip, and a paper pressing roll 18 is attached so as to be rotatable forward and backward with the fixed shaft 22 as an axis. A stand 24 that is positioned outside the two flat plates and supports the spring mechanism 28 and the cylinder mechanism is fixed to the shaft 16.

  A plate 26 is attached to the upper portion of the stand 24, and a spring mechanism 28 for bringing the paper pressing roll 18 into contact with the cut paper is disposed between the plate 26 and the swing arm 20. The spring mechanism 28 includes a knob 30 screwed to the plate 26 and a rod 34 fitted to the knob 30 via a spring 32, and the rod 34 is pivotally attached to the swing arm 20. . A spring accommodation hole is installed inside the knob 30 from the lower end surface side, a spring 32 is inserted, and the rod 34 is inserted from the opening of the accommodation hole. A washer is formed at the insertion portion of the rod 34 so as to receive the spring 32, and the rod 34 presses the paper pressing roll 18 in the point-contact direction of the lower low-speed conveying means 12 by the pressing force of the spring 32. . The knob 30 is screwed to the plate 26 so that the pressing force can be arbitrarily adjusted according to the tightening condition.

  A stay shaft 36 is formed between the flat plates on the other end of the swing arm 20 having the fixed shaft 22 attached to the tip. An air cylinder 38 serving as a cylinder mechanism is attached to the end of the plate 26 opposite to the attachment side of the spring mechanism 28.

  The air cylinder 38 is arranged so that the cylinder rod 40 extends and contracts toward the stay shaft 36. The air cylinder 38 pushes down the stay shaft 36 when the cylinder rod 40 extends. When the stay shaft 36 formed at one end of the swinging arm 20 is pushed down, the paper presser formed at the other end of the swinging arm 20 rotates around the shaft 16 as shown in FIG. The roll 18 rises in a direction away from the lower low speed conveying means 12.

  On the other hand, when the cylinder rod 40 is contracted, the stay shaft 36 that is in contact with the tip of the head moves in a direction away from the lower low speed conveying means 12 by the spring mechanism 28 as shown in FIG. The head tip is separated from the stay shaft 36 and stops at a position having a predetermined gap from the swing arm 20.

  The clearance is within an adjustable range so that the cylinder rod 40 and the stay shaft 36 do not come into contact when the pressing force of the paper pressing roll 18 is adjusted by screwing the knob 30 of the spring mechanism 28. The cylinder means can be, for example, a linear actuator that can expand and contract in a linear direction.

  As described above, the paper pressing means has been described with the configuration including the paper pressing roll 18, the spring mechanism 28, and the cylinder mechanism. In addition to this, the cylinder rod is connected to the paper pressing roll, and the rod is expanded and contracted. It is also possible to adopt a configuration in which the paper pressing roll that is brought into contact with the cut paper can be brought into contact or non-contact with the cut paper surface that has been spliced.

  On the other hand, a controller 42 that controls expansion and contraction of the cylinder rod 40 is connected to the cylinder mechanism. As shown in FIG. 3, a detection signal is input to the control unit 42 from a sensor 52 that detects a signal that has been spliced by the splicing device 50. The control unit 42 is configured to send an expansion / contraction control signal for the air cylinder 38 to a plurality of connected air cylinders 38 based on the input detection signal.

The paper jam prevention device 80 configured as described above operates as described below.
A case where a normal cut paper 11 without a paper splicing part moves on the lower low-speed conveying means 12 will be described. As shown in FIG. 4, before the brush 90d of the snubber 90 presses the rear end of the cut paper 11 against the cut paper 11 that has been conveyed at high speed, the downward flow generating means 94 moves the front stage of the cut paper 11 in the conveyance direction. To the lower low speed conveying means 12 while feeding. When the cut paper 11 is hit from the upper high-speed conveying means 13 one by one by the brush 90d of the snubber 90 and the trailing edge of the cut paper is pressed against the suction port 92a, the suction means 92 is braked.

  The paper pressing roll 18 does not roll on the cut paper 11 moving on the lower low-speed conveying means 12, and as shown in FIG. 1 (1), the stay shaft 36 is pushed down by the extension of the cylinder rod 40 of the air cylinder 38 to swing. The paper pressing roller 18 installed at the other end of the arm 20 holds the position away from the cut paper 11 to be conveyed, that is, the non-contact state.

  Next, a description will be given of a case where cut sheets having overlapping portions joined together, that is, two sheets of uncut bonded sheets are conveyed on the lower low-speed conveying means 12. FIG. 5 is an explanatory diagram of a cut sheet having an overlapping portion that is conveyed on the lower low-speed conveying means.

  When the old rolls of the paper feeding unit are reduced and paper splicing is performed between the old roll and the new roll, the sensor 52 detects a signal for performing the paper splicing. The detection signal of the sensor 52 is input to the control unit 42, and the control unit 42 outputs a signal set based on the detection signal so as to press a predetermined number of cut sheets around the cut sheet that has been spliced. It is sent to the cylinder 38. In each air cylinder 38, based on the control signal, the cylinder rod 40 is contracted in accordance with the timing when the cut paper 11 having the overlapping portion is conveyed onto the lower low-speed conveying means 12, and the paper pressing roll 18 is moved to the lower low-speed conveying means. The cut paper 11 is pressed with a predetermined pressing force by the spring mechanism 28.

  Before the brush 90d of the snubber 90 presses the rear end of the cut paper 11 against the cut paper 11 having the overlapping portion that has been conveyed at high speed, the downward flow generating means 94 moves the front stage of the cut paper 11 in the conveyance direction. The lower low-speed conveying means 12 is held down while feeding. The top roll b and the bottom roll a are both pressed by the presser roll 18 of the paper holding means 10 (the downstream side in the transport direction, the same applies hereinafter), and only the upper roll b is not fed forward. Subsequently, the cut paper 11 is hit from the upper high-speed conveying means 13 one by one by the brush 90d of the snubber 90, and the rear end portion of the cut paper is pressed against the suction port 92a. The lower paper a is braked by the suction means 92. The rear end portion of the upper paper b is slightly swollen by the brush 90d. However, since the front end portion is pressed by the pressing roller 18, it does not wrinkle greatly. For this reason, the cut paper that is continuously supplied is not sandwiched between the upper paper b and the lower paper a of the cut paper having an overlapped portion, thereby causing a paper jam.

  After the cut paper 11 having the overlapping portion passes through the lower low speed conveying means 12, a non-contact signal is sent from the control unit 42 to the air cylinder 38, the cylinder rod 40 extends, and the paper press roll 18 moves to the lower low speed conveying means 12. It will separate from and will be in a noncontact state.

  According to such a paper jam prevention device, it is possible to press two sheets of cut sheets that are spliced together at a position where the conveyance speed is displaced, and prevent paper jamming by preventing the upper paper from curling up. Accordingly, the operation time required for the removal work due to the paper jam and the inspection / adjustment work after the removal can be eliminated, and the operation time of the printing press can be greatly prolonged.

The control signal of the control unit is set in advance, for example, based on the signal that detects the paper splicing, the time from the paper splicing device until the cut paper having the paper splicing unit passes through the lower low-speed conveying means. It is also possible to configure the interleaf presser so as to contact the cut paper.
In this embodiment, the spring mechanism is formed on the paper presser roll side and the air cylinder is installed on the other side of the arm. However, the air cylinder is formed on the paper presser roll side and the spring mechanism is installed on the other side of the arm. It can also be set as the structure to do.

It is a side view of the paper pressing means which concerns on embodiment. It is a top view of the paper pressing means concerning an embodiment. 1 shows a schematic block diagram of a paper jam prevention device. The partial enlarged view of the conveyance part of the theta for printers is shown. It is explanatory drawing of the cut sheet | seat which has an overlap part conveyed on a lower low speed conveyance means. It is explanatory drawing of the conveyance part of the conventional theta for printing presses. It is explanatory drawing of the cut paper which has an overlap part. It is explanatory drawing of the cut paper which has the overlap part conveyed on the conventional lower low-speed conveyance means.

Explanation of symbols

10 ......... Paper holding means, 11 ......... Cut paper, 12 ......... Lower low speed conveying means, 13 ......... Upper high speed conveying means, 14 ......... Shaft holder, 16 ......... Hinge shaft, 18 ... ... paper press roll, 20 ......... oscillating arm, 22 ......... fixed shaft, 24 ......... stand, 26 ......... plate, 28 ......... spring mechanism, 30 ......... knob, 32 ......... spring , 34 ......... Rod, 36 ......... Stay shaft, 38 ......... Air cylinder, 40 ......... Cylinder rod, 42 ......... Control unit, 50 ......... Paper splice device, 52 ......... Sensor, 60 ......... Printer, 70 ......... Theta, 80 ......... Paper press prevention device, 90 ......... Snubber, 92 ......... Suction means, 94 ......... Downflow generation means.

Claims (4)

The lower low speed conveying the two-ply cut paper having paper splicing between the old roll and the new roll to be conveyed at high speed by the conveying portion of the upper high-speed transport means and the printing machine theta having a lower low-speed conveying means by downflow generating means In the paper jam prevention method of the theta for a printing press that suppresses the paper jam of the cut paper pressed against the suction means provided on the lower surface of the lower low-speed conveying means by a snubber. Based on the detection signal, a signal is detected at the displacement of the cut paper transported by the upper high-speed transport means from the high-speed state to the low-speed state. at the moment that the cut sheet was piecing is carried, to back and forth around the cut sheet 2 ply that the paper splicing in rolling contact with the paper pressing roll to the tip portion of the cut sheet Paper jam prevention method of theta for a printing press, characterized in that presses said cut sheet of predetermined number of the lower low-speed conveying means. The lower low speed conveying the two-ply cut paper having paper splicing between the old roll and the new roll to be conveyed at high speed by the conveying portion of the upper high-speed transport means and the printing machine theta having a lower low-speed conveying means by downflow generating means In the paper jam prevention device of the theta for a printing press that holds the rear end portion of the cut paper against the suction means provided on the lower surface of the lower low-speed transport means by a snubber to prevent jamming of the cut paper.
Means for detecting a signal that has spliced between webs;
Based on the detection signal of the detection means, the paper is spliced at the position where the transport speed of the cut paper transported by the upper high-speed transport means shifts from the high speed state to the low speed state, downstream of the snubber. A paper presser that presses a predetermined number of the cut sheets back and forth around the two sheets of cut paper spliced by a paper pressing roller that is in rolling contact with the leading end of the cut paper to the lower low-speed transport unit;
An apparatus for preventing a paper jam in a theta for a printing press.   The printing press according to claim 2, wherein the paper pressing unit is configured such that a paper pressing roll that is in rolling contact with the cut paper can be brought into contact with or non-contacted with the cut paper surface that has been spliced by expansion and contraction of a cylinder rod. Paper theta jam prevention device. The paper pressing means is
A paper press roll attached to a swing arm pivotally supported by a frame, facing the lower conveying means, and in contact with the cut paper;
A spring mechanism that presses the swing arm to bring the paper pressing roll into contact with the cut paper surface;
A cylinder mechanism that rotates about the axis of the swing arm to separate the paper press roll from the cut paper;
The paper jam prevention device for a theta for a printing press according to claim 2, comprising:

Images