JP4325854B2 - Theta for printing press - Google Patents

Description

  The present invention relates to a sectional drive type theta for printing presses. More specifically, a motor is installed in each of the infeed unit drive system, the cut unit drive system, the high-speed conveyance unit drive system, and the low-speed conveyance unit drive system. The present invention relates to a theta for a printing press that individually drives and controls each drive system.

  In general, a theta for a printing press includes an infeed portion having a plurality of draw rollers for taking in a web supplied at high speed from the printing press, and a cutting portion for cutting the web into sheets of a predetermined size with a cutter cylinder, A high-speed conveying means provided on the downstream side of the cutting section, a low-speed conveying means for conveying the cut paper sheets in a tiled state, a stack section for stacking the cut paper sheets conveyed, and the like. Here, the high-speed conveying means has, for example, a high-speed vacuum drum that is positioned above and rotates opposite to the low-speed conveying means, and peeling protrusions are arranged in parallel with the rotation axis on the outer periphery of the high-speed vacuum drum, The trailing edge of the cut sheet is pushed down by the peeling projection, and the cut sheet is transferred from the high-speed conveyance unit to the low-speed conveyance unit to be in a tiled state.

  Such a printing machine sheeter is usually installed on-line downstream of the rotary offset printing press and is operated synchronously with the printing press. In that case, in addition to the mechanical coupling method that obtains the rotational force from the output shaft of the printing press by the input shaft, the rotation of the main shaft (motor shaft or output shaft, etc.) of the printing press is detected by the encoder, and the electrical rotation is detected. There is a shaftless drive system that obtains rotational force by synchronously operating a theta drive motor based on a signal. The latter is simply a difference in which the former input shaft is removed and a single theta drive motor is installed instead. The theta drive system after the motor is the same as the mechanical coupling system. . That is, the infeed unit, the cut unit, the high-speed conveyance unit, and the low-speed conveyance unit each have a rotation transmission system such as a timing belt and gears interposed between the input shaft and the common theta drive motor, and each rotation transmission It is driven through the system.

In such a configuration (both mechanically coupled and shaftless drive), the cut part and other parts are coupled by a rotation transmission system, so various parts of the theta for the printing press other than the cut part. The resulting load fluctuation is directly transmitted to the cutter cylinder, which adversely affects the accuracy of the cut length. The load fluctuation occurs due to the following reasons, for example.
(1) Although the web is tensioned by the high-speed vacuum drum, the load decreases at the moment of cutting, and when the web tip is sucked by the high-speed vacuum drum after a while, the load for driving the high-speed vacuum drum increases. .
(2) When the separation projection presses the trailing edge of the cut sheet against the low-speed vacuum drum, an increase in load occurs in driving both the high-speed vacuum drum and the low-speed vacuum drum.
(3) With regard to the draw roller, the tension fluctuation between the printing press and the theta becomes the load fluctuation as it is.
In addition, the extension of the timing belt in the rotation transmission system between the cut portion and other portions, or the backlash and backlash of the gears also adversely affect the accuracy of the cut length.

  In normal printing work, actual printing is started at 200 to 300 rpm, registration and checking are performed at 300 to 400 rpm, and commercial operation is performed at 500 rpm or more. In recent years, with the further increase in the speed of the offset rotary printing press, the business operation is frequently performed at 800 to 1000 rpm. When the cut paper is transferred from the high-speed transport means to the low-speed transport means and the brake is applied to realize the tiled state, in the low speed range, if the paper is pushed in with the tip of the peeling protrusion without removing the rear end of the cut paper, The rear end falls into the suction range of the low-speed conveying means, and good braking is applied. However, as the operation speed increases, the cut sheet falls considerably ahead of the planned position even if it is pushed in by the peeling projection due to the inertia or braking time. Sometimes, the braking is not sufficiently performed, and the cut sheet may jump out to the stack portion at a high speed.

  In view of this, a structure has been proposed in which the handle is manually turned to adjust the position of the peeling protrusion according to the operating speed of the printing press (see Patent Document 1). However, the advancement amount of the peeling protrusion is not proportional to the rotational speed of the handle mechanically, the tension of the endless belt also changes, and stable adjustment is difficult and automation is difficult. Also, manual handle operation is very complicated and inconvenient and cannot be finely adjusted. Therefore, it is not possible to completely prevent the cut sheet from popping out when the rotation speed fluctuates.

In addition, there is a transition period that covers a wide speed range from low-speed operation immediately after the start of operation to normal high-speed operation as the printing machine speeds up, and the cut sheet is stable and accurate for high-speed operation including that transition period. There is also a need for a device that can transport the machine.
JP-A-9-328251

  The problem to be solved by the present invention is that load fluctuations occurring in various places have an adverse effect on the cutting accuracy (cut position is out of order), and the separation protrusions on the trailing edge of the cut sheet according to the printing machine speed. It is difficult to automatically adjust the advance amount (advance amount) and it is difficult to cope with high-speed operation. It covers a wide speed range from low-speed operation immediately after operation start to normal high-speed operation, including the transition period. It is difficult to convey the cut sheet stably and accurately.

  The present invention relates to an infeed portion having a draw roller for taking in a web, a cut portion for cutting the web into sheets of a predetermined size with a rotary cutter cylinder, high-speed conveying means provided on the downstream side of the cut portion, and cutting A low-speed conveying means for conveying the cut sheets in a stacked state, and a stack unit for stacking the cut sheets. The high-speed conveying means has a high-speed vacuum drum that is positioned above and rotates opposite to the low-speed conveying means. The separation protrusions are arranged on the outer periphery of the high-speed vacuum drum in parallel with the rotation axis, and the rear end of the cut sheet is pushed down by the separation protrusions to transfer the cut sheet from the high-speed conveyance unit to the low-speed conveyance unit. In the theta for a printing press to be stacked, a motor is installed in each of the infeed unit drive system, the cut unit drive system, the high-speed conveyance unit drive system, and the low-speed conveyance unit drive system. The cut section drive system motor is controlled so as to rotate the cutter cylinder synchronously in response to the rotation signal of the printing press, and the other motors receive the rotation signal and have a relative relationship set in advance. It is a theta for a printing press that is controlled to rotate with a certain property.

Here, the high-speed vacuum drum of the high-speed conveying means rotates synchronously with the cutter cylinder when the cutter cylinder rotates at a constant speed ( when the cutter cylinder continues to rotate at a constant speed) , and when the cutter cylinder rotates at a variable speed. (When the rotational speed of the cutter cylinder is changing) Set the advance angle (the distance from the trailing edge of the cut sheet to the position where the separation protrusion hits the cut sheet (the amount of advance of the leading edge of the separation protrusion)) The speed is controlled by the high-speed conveying means drive system motor so that the amount is converted into the rotation phase of the vacuum drum . The speed of the draw roller of the infeed unit is controlled by the infeed unit drive system motor so as to have a predetermined pulling rate with respect to the web traveling speed.

  The theta for a printing press according to the present invention is a system in which an infeed unit drive system, a cut unit drive system, a high-speed conveyance unit drive system, and a low-speed conveyance unit drive system are each installed and driven individually. Even if load fluctuations occur at various locations, the cutting accuracy is not significantly transmitted to the cutting portion driving system, but is accurately controlled by the cutting portion driving system motor and the cutter cylinder rotates, so that the cutting accuracy is remarkably improved. In addition, the speed control of the high-speed conveying means drive system motor makes it easy to automatically adjust the advance amount (advance amount) of the peeling protrusion relative to the trailing edge of the cut sheet according to the printing machine speed. Yes. By controlling the speed of the in-feed unit drive system motor, the pulling rate with respect to the web traveling speed can be easily adjusted. In addition, the motor control of the infeed unit drive system, high-speed transfer means drive system, and low-speed transfer means drive system ensures stable operation over a wide speed range from low-speed operation immediately after operation to normal high-speed operation, including the transition period. In addition, the cut sheet can be accurately conveyed.

  Furthermore, the infeed part drive system, the cut part drive system, the high-speed transport means drive system, and the low-speed transport means drive system need only have a rotation transmission mechanism inside each drive system. Various devices and parts as control means, such as a gear box, a clutch, a torque limiter, and the like are not required, and the entire device can be reduced in weight and simplified. In addition, the degree of freedom of rotation control is improved, and the burden on the operator can be greatly reduced by program control.

  The printer theta is installed on-line downstream of the web offset press. In the present invention, for example, a high-precision rotation detection encoder is attached to the shaft of a rotary printing press, and an independent drive system is installed on each section of the printing press, and the rotation is controlled by receiving the signal from the rotation detection encoder. . In this way, the theta for the printing press is operated in synchronization with the rotary offset printing press. When the rotary printing press is controlled shaftless, the operation of the printing press sheeter can be controlled in synchronization with the rotary printing press by an electrical rotation signal that controls each printing unit motor. Therefore, the rotation signal of the printing press in the present invention includes a virtual rotation signal for controlling each printing unit motor in the printing press in addition to the actual rotation signal detected by the encoder of the rotation of the printing press shaft. It is.

Printing in an offset rotary printing press is performed, for example, by the following general procedure, and the web is supplied to a subsequent printing press sheeter.
(1) The winding paper mounted on the paper feeding unit is sent to the printing unit while being given an appropriate tension, and is usually printed on both sides simultaneously.
(2) Next, it is sent to the drying section, the printing paper surface is heated, and the ink is dried.
(3) Thereafter, by passing through the cooling section, the paper surface temperature is lowered and ink setting is promoted.
(4) The slipperiness of the paper surface is improved by a silicon applicator and the like, and generation of static electricity is prevented, and a constant tension is applied by a drag roller.
(5) When the product form is folded, it passes through the folding machine. When the product form is sheeted, the web is usually passed by the first free roller at the entrance of the theta for the printing press through the pass roll from the upper part of the folding machine. Is introduced.

  In the sheeter for printing presses, the web is taken in by the infeed unit, the web is cut into sheets of a predetermined size by the cutter cylinder of the cutting unit, and the cut paper is conveyed in a tiled state by the high-speed conveying means and the low-speed conveying means, and stacked. Stack the cut papers in each section. In the present invention, a motor is installed in each of the in-feed unit drive system, the cut unit drive system, the high-speed transport unit drive system, and the low-speed transport unit drive system, and is individually driven. The cut section drive system motor is controlled to rotate the cutter cylinder synchronously in response to the rotation signal of the printing press, and the other motors are controlled to rotate with the predetermined relative relationship in response to the rotation signal. Is done.

  FIG. 1 shows the overall configuration of an embodiment of a theta for a printing press. The printing machine sheeter includes an infeed unit 11 that takes in a web 10 supplied at high speed from an offset rotary printing press (not shown), a cut unit 12 that cuts the web 10 into sheets of a predetermined size, A high-speed conveying means 13 provided on the downstream side of the cutting portion 12, a low-speed conveying means 14 for conveying the cut cut paper in a tiled state, and a stack portion 16 for stacking the cut paper 15, are entirely covered with a cover 17. Covered. Details of the high-speed transfer means 13 and the low-speed transfer means 14 are shown in FIG.

  The infeed unit 11 includes a web take-in mechanism including a plurality of free rollers 21a and 21b, draw rollers 22a and 22b, nip rollers 23a and 23b, various sensors, and the like, and the web 10 discharged from the rotary printing machine at a high speed. This is the part that feeds the cut part 12 appropriately. The cutting part 12 has a lower fixed blade 25 and a rotary blade 27 mounted on the upper cutter cylinder 26, and cuts the web 10 into sheets of a predetermined size by rotating at the same speed as the rotary printing press. It is a part to do. The high-speed conveyance means 13 includes a first air blow 28, an upper first vacuum drum 29, an upper second vacuum drum 30, a second air blow 31, and the like, and cuts at the cut portion 12 by conveying the web 10 in a tension state. This is a part that improves accuracy. Further, the low-speed conveying means 14 has a structure in which a vacuum belt 34 is stretched between a front pulley 32a, a tension pulley 32b, and a rear vacuum drum 33, and a vacuum box 35 is installed on the inner upper portion of the vacuum belt 34 (FIG. 2). reference).

  The upper second vacuum drum 30, which is a high-speed vacuum drum, is located just above the vacuum drum 33 of the low-speed conveying means 14, and a peeling projection (snapper; in this embodiment, a rigid brush made of nylon or the like) 36 is provided on the outer peripheral surface. Arranged in parallel with the central axis, the rear end of the cut sheet is pushed down by the peeling projection 36 so that the cut sheet is transferred from the high-speed conveying unit 13 to the low-speed conveying unit 14. As a result, the speed of the cut sheet is reduced to about 1/10 to 1/20 of the web line speed. The cut papers pressed by the peeling projections 36 largely overlap each other and become a tiled state, and about 40 mm on the rear end side of the cut paper is adsorbed by the vacuum drum 33 and the vacuum belt 34, while the upper surface of the front end of the cut paper is The air is pulled by the Coanda effect by the second air blow 31 and sequentially conveyed to the next stack unit 16.

  The stack unit 16 includes two bar-shaped paper guides 40 erected at the entrance, two exit joggers 41 positioned opposite to both the paper guides 40 at the exit, and the flow direction of the cut sheet A pair of variable-width-type side joggers 42 located on the left and right sides of the sheet are provided, and the cut sheets entering the stack unit 16 are aligned and stacked on the pallet 43 positioned below. The cut paper 15 can be moved up and down by a pallet lifting mechanism. A gripper mechanism 44, a temporary stacking fork mechanism 45, and the like are provided in the vicinity of the stack portion 16 so that the main pile (stacked cut sheets) can be taken out. When the main pile is taken out, the gripper moves forward to grasp and support the trailing edge of several tens of sheets, insert the temporary stacking fork into the gap created below it, and release the gripper to stack the cut sheet on the temporary stacking fork. In that state, take out the main pile. Next, a new pallet is installed and raised to approach the temporary loading fork, and the temporary loading fork is pulled out. By using the gripper in this way, it is possible to eliminate the operation of processing the waste paper for extrusion in the high rotation range, which requires extremely skill, and to eliminate the waste paper.

  The theta for a printing press according to the present invention is electrically coupled to a rotary printing press in a shaftless manner, and is connected to an infeed unit drive system, a cut unit drive system, a high-speed conveyance unit drive system, and a low-speed conveyance unit drive system, respectively. The motor is individually installed and is configured to be completely independently driven. As shown in FIG. 3, various rollers, cutter cylinders, drums, and the like, which are constituent elements of each part, are rotatably supported by bearings 19 on frames 18a and 18b on both sides.

  The infeed unit drive system is coupled to the shaft of the first draw roller 22a via the coupling 70 with the infeed unit drive system motor 71, and the timing of the shaft of the first draw roller 22a and the axis of the second draw roller 22b, respectively. The pulleys 72a and 72b are provided and the timing belt 73a is stretched over. The first draw roller 22a is directly driven by an infeed unit drive system motor 71, and the second draw roller 22b is driven by a timing belt 73a. Here, the diameter of the second draw roller 22b is set to be slightly larger than the diameter of the first draw roller 22a. Therefore, the second draw roller 22b is slightly rounder than the first draw roller 22a even at the same rotational speed. The speed is great. In this way, the first draw roller 22a and the second draw roller 22b are freely adjusted by the infeed unit drive system motor 71 so as to achieve a desired draw ratio as a whole while maintaining a constant draw ratio relationship. The

  The cut portion drive system has a configuration in which a cut portion drive system motor 74 is coupled to the shaft of the cutter cylinder 26 via a coupling 70. The cutter cylinder 26 is directly connected and driven by the cut portion drive system motor 74, and rotates completely in synchronization with the rotation of the rotary printing press. In this way, in the cutting part, the cutter cylinder 26 is driven completely independently and independently, so that load fluctuations in other parts are not transmitted and there is no possibility that the cutting accuracy is deteriorated.

  The high-speed conveying means driving system is coupled to the shaft of the second vacuum drum 30 with a high-speed conveying means driving system motor 75 via a coupling 70, and the timing is applied to the axis of the second vacuum drum 30 and the axis of the first vacuum drum 29, respectively. Pulleys 72c and 72d are provided, and a timing belt 73b is stretched over. The second vacuum drum 30 is directly driven by a high-speed conveying means drive system motor 75, and the first vacuum drum 29 is driven by a timing belt at a constant speed increase rate. As described above, the second vacuum drum 30 is directly driven by the high-speed conveying means driving system motor 75, so that the advance angle control of the peeling projection 36 can be performed by a setting program for the high-speed conveying means driving system motor 75. Responses to speed changes can be made smoothly and paper jams are less likely to occur.

  The low-speed conveying means drive system has a configuration in which a low-speed conveying means drive system motor 76 is coupled to the shaft of the low-speed vacuum drum 33 via a coupling 70. The low-speed conveying means drive system motor 76 controls the rotation speed of the low-speed vacuum drum 33. Can be controlled directly. Note that the vacuum belt 34 wound around the low-speed vacuum drum 33 is also driven at the same speed.

  FIG. 4 is a block diagram of the entire drive system. Here, an electric pulse signal is received from a high-resolution rotation detection encoder 79 attached to the main shaft of the rotary printing press, and the operation is basically performed by real master control synchronized with the electric pulse signal. The rotation detection encoder 79 is preferably a high-resolution product such as 1.68 million pulses / rotation, and is connected directly to the drive motor shaft of the rotary printing press or directly after the output shaft, so that twist, delay, etc. It is desirable to take out no signal. The blocks of the cut unit drive system 80a, the infeed unit drive system 80b, the high speed transport unit drive system 80c, and the low speed transport unit drive system 80d are linked by direct data transmission by optical communication using the optical transceiver 81. . Use of optical communication prevents noise and enables high-speed and high-reliability data transmission. The pulse signal from the rotation detection encoder 79 compensates for dead time, and then transmits a phase command to each drive system based on the compensation, and each drive system issues an angle command based on the phase command.

  Each drive system is configured such that an angle setting (S), a speed setting (V), and an acceleration / deceleration torque (a) can be programmed as required, whereby a position controller 82, a speed controller 83, and a torque controller are configured. 84, and the current controller 85 controls the drive current to each drive system motor 71, 74, 75, 76. For example, an inverter dedicated induction motor is used as each drive system motor. The rotation of the motor is detected by the encoder 87 and feedback controlled. Although a servo motor can be used, it is generally expensive, and an inverter-only induction motor is preferable for high output. Here, the cut unit drive system 80a is mainly used, and the other infeed unit drive system 80b, high-speed transfer unit drive system 80c, and low-speed transfer unit drive system 80d are subordinate, but the basic configuration is the same.

  In the cutting section 12, the cutter cylinder 26 is controlled to rotate in complete synchronization with the rotary printing press by a cutting section drive system motor 74 directly connected thereto, and cuts the web to a specified length.

  In the infeed unit 11, the first free roller 21a and the second free roller 21b are guide rollers located at the theta entrance and extending to the first draw roller 22a and the second draw roller 22b. A tension meter 90 and a tension detection roller 91 are provided in the middle to detect the tension applied to the web 10. The nip pressure between the first nip roller 23a and the second nip roller 23b is controlled by an electropneumatic regulator or the like according to the detected web tension. Here, the nip rollers 23a and 23b hold the web 10 against the draw rollers 22a and 22b, and increase the draw effect.

  The first draw roller 22a and the second draw roller 22b are given a rotational force by the infeed section drive system motor 71, and the circumferential speed is slightly increased from the line speed of the web 10, but actually Since the web speed does not increase and slips between the draw rollers 22a and 22b and the web 10, the web speed is constant but tension is applied to the web. The speed increase rate, that is, the tension required, depends on conditions such as paper quality, paper weighing, and the distance between the printing press sheeter and the rotary printing press. For example, the pulling rate (speed increasing rate) of the second draw roller 22b with respect to the first draw roller 22a is set to about + 0.2% (this is determined by the diameter ratio of the first draw roller 22a and the second draw roller 22b). The pulling rate (speed increasing rate) of the first draw roller 22a with respect to the line is selected to be about + 0.2% (this can be adjusted by controlling the number of revolutions of the infeed unit drive system motor 71). Therefore, if the number of rotations of the infeed unit drive system motor 71 is increased or decreased as necessary, the pulling rate can be freely and easily adjusted over a wide range. In this way, by controlling the rotation of the in-feed unit drive system motor 71 and adjusting the web pulling speed so as to obtain a specified pull rate, the web tension is maintained at a set value and is stable. The web running operation can be performed. In addition, since the pulling rate of the second draw roller 22b is slightly larger than the first draw roller 22a, a tension is applied to the compensator roller 92 between the two, and the web during this time does not sag, The cutting accuracy can be improved.

  In the high-speed conveying means 13, the first air blow 28 is provided at a position about 3 mm directly below the web or cut sheet on the downstream side of the fixed blade 25 of the cut portion 12, and is provided substantially horizontally. The length with respect to the cut sheet flow direction is set to approximately the middle position between the upper first vacuum drum 29 and the upper second vacuum drum 30. A plurality of air outlets 48 are provided on the upper surface of the air blow in the flow direction of the web, and air is blown from a blower (not shown) through a duct, and is flattened from the air outlets 48 toward the lower surface of the cut sheet. Blows out high speed airflow. Due to the Coanda effect of this high-speed air flow, the cutter cylinder 26 conveys the web tip in the downstream direction while attracting the leading end of the web that tends to rise in the rotational direction to the first air blow 28.

  The second air blow 31 is on the upper side of the cut sheet on the downstream side of the upper second vacuum drum 30, and the leading end thereof extends to substantially the center of the stack portion (see FIG. 1). The air outlet 49 has a large number of upstream portions to increase the suction effect of the leading edge of the cut paper, and a few intermediate portions and a large number of downstream portions (only the portion about 40 mm from the leading edge of the cut paper (cut) Since the paper is piled up by a low-speed conveyance means, the suction conveyance effect can be improved.

  The upper first vacuum drum 29 is positioned on the web or cut paper on the downstream side of the cut portion 12 and is composed of a rotating vacuum drum main body 50, a hollow fixed shaft 51, and the like. The vacuum drum main body 50 has a large number of suction holes 52 opened on the surface and penetrating to the inside. The web or cut paper is adsorbed through the suction hole of the vacuum drum main body 50 within the range of the vent hole 53 of the hollow fixed shaft 51 and both separators 54 by the operation of the exhaust fan. There is no suction from most suction holes that are not in communication with the vents. As will be described later, the output of the air exhauster is automatically and smoothly controlled in accordance with the speed of the printing press to ensure stable conveyance.

  The upper first vacuum drum 29 rotates at a peripheral speed that is about 2% faster than the line speed by a combination of the number of teeth of the timing pulleys 72c and 72d. The front end of the web that has passed through the cut portion 12 is sent to the downstream side while being adsorbed by the vacuum drum main body 50. At this time, since the peripheral speed of the upper first vacuum drum 29 is higher than the web line speed, the web is tensioned. Therefore, since the cut portion 12 cuts, the size of the cut sheet is always constant. In the cut sheet, the peripheral speed of the upper first vacuum drum 29 is faster than the web speed, so that the distance between the cut sheet and the web tip is little by little. This eliminates the interference between the cut sheet and the web at the cut sheet transfer position by the peeling projection 36 described later.

  Next, the upper second vacuum drum 30 is provided on the downstream side of the upper first vacuum drum 29 at a position within the cut sheet length from the fixed blade 25 of the cutting portion 12. In addition, the second vacuum drum 30 includes a vacuum drum main body 55, a peeling projection 36, a hollow fixed shaft 56, and the like. A number of suction holes 59 are opened on the surface of the vacuum drum main body 55 except for the position of attaching the separation protrusion, and penetrate to the inside. The opening edge of the suction hole 59 is chamfered to prevent the web or cut paper from being scratched or soiled during suction.

  The hollow fixed shaft 56 penetrates ten or more vent holes 60 in a straight line in the axial direction, and two grooves parallel to the axial direction are provided on both sides thereof. A separator 65 is accommodated in the groove via a wave spring 64. The web or the cut paper is adsorbed through the suction hole in the range between the vent hole 60 of the hollow fixed shaft 56 and both separators 65 by the operation of the exhaust fan. Suction from most suction holes that do not communicate with the vent holes does not occur. The output of the exhaust fan is automatically and smoothly controlled in accordance with the speed of the printing press, and stable conveyance is ensured.

  The upper second vacuum drum 30 is controlled by a high-speed conveying means drive system motor directly connected thereto, and rotates at a peripheral speed that is about 3% faster than the web line speed. The front end of the web that has passed through the cut portion 12 is sent to the downstream side while being adsorbed by the upper first vacuum drum 29, and then adsorbed by the upper second vacuum drum 30 and further cut by the cut portion 12 in a tension state. . The upper second vacuum drum 30 and the upper second vacuum drum 30 together with the intermediate tension at the upper first vacuum drum 29 are more reliably pulled as a whole, so that the cutting accuracy is ensured in a stable manner.

  At the exit side of the upper first vacuum drum 29 and the upper second vacuum drum 30, wrap-in preventing plates 47a and 47b are positioned, and the comb portion is inserted into a groove on the circumference of each vacuum drum, so that the leading end of the web in progress Is prevented from moving upward while being wound around the drum. In the conventional type, since the comb portion only protrudes horizontally, when the rotation increases, the leading edge of the cut paper often becomes dirty or damaged. In this embodiment, as shown in FIG. 8, each comb portion 98 of the entrainment prevention plate 47b is curved (curvature R1, R2, R3) along the circumferential direction and the peeling direction of the vacuum drum 30, Are connected with a smooth curve, and the cross section is also tapered or rounded so that the leading edge of the cut paper is smoothly peeled off. As a result, even if it is operated at high speed with thin paper, it will not be damaged or soiled, and paper jams can be prevented.

Next, the advance angle control of the peeling projection 36 in the upper second vacuum drum 30 will be described. In a low rotation range of about 0 to 100 rpm, as shown in FIG. 5, when the peeling projection 36 is pressed without removing the rearmost end portion of the cut paper, as the peeling projection 36 rotates, The end falls exactly into the suction range of the vacuum drum 33 of the low-speed conveying means 14 and is braked and moves at a low speed. FIG. 5A shows a state in which the leading end of the peeling projection 36 hits the cut sheet s (distance L ₁ from the trailing edge of the cut sheet), and B shows the upper second vacuum drum by the peeling projection 36 as the rotation proceeds. In the state in which the separation of the cut sheet s from the sheet 30 is almost completed and the rear end portion of the cut sheet s is transferred to the vacuum drum 33 of the low-speed conveying unit 14, C is further rotated to cut the cut sheet s to the low-speed conveying unit 14 The state of the transfer is completed. At that time, the leading edge of the next cut sheet s is adsorbed to the upper second vacuum drum 30.

However, under this condition, as the rotational speed increases, the trailing edge of the cut sheet falls forward from the inlet separator position in the suction range of the vacuum drum 33 due to the inertia and braking time. For this reason, sometimes the braking is not sufficiently effective, and the cut sheet may jump out to the stack portion at a high speed. Therefore, in a high rotation range (for example, about 800 rpm), as shown in FIG. 6, the position of the separation projection 36 is advanced relative to the cut sheet s, and the separation projection is located at a position considerably ahead of the rear end of the cut sheet. Make sure that the tip is pressed down. Then, with the rotation of the peeling projection 36, the trailing edge of the cut sheet s falls well into the suction range of the vacuum drum 33 of the low speed conveying means 14, and can be moved at a low speed with sufficient braking. 6A shows a state in which the leading end of the peeling projection 36 hits the cut paper s (distance L ₂ from the trailing edge of the cut paper), and B shows the upper second vacuum drum by the peeling projection 36 as the rotation proceeds. In the state in which the separation of the cut sheet s from the sheet 30 is almost completed and a part of the rear end portion of the cut sheet s is in contact with the vacuum drum 33 of the low-speed conveying unit 14, C further advances to the low-speed conveying unit 14. The state where the transfer of the cut sheet s is completed is shown. At that time, the leading edge of the next cut sheet s is about to be attracted to the upper second vacuum drum 30.

As can be seen from a comparison between FIG. 5 and FIG. 6, the distance L ₂ at high speed operation is longer than the distance L ₁ at low speed operation. That is, when the rear edge of the cut sheet is used as a reference, the position of the peeling protrusion during high speed operation is advanced (advance angle: the phase is advanced) than the position of the peeling protrusion during low speed operation. If the advancement amount of the peeling projection 36 is appropriately controlled in accordance with the rotation speed of the printing press, the trailing edge of the cut sheet falls into the suction range of the vacuum drum 33, and braking is applied to enable stable conveyance. FIG. 7 shows the relationship between the rotational speed of the printing press and the amount of advancement of the tip of the peeling protrusion. Both have a substantially linear relationship.

  The advance angle control for realizing such position control of the peeling projection is performed by a high-speed conveying means drive system. Since the peeling projection 36 is attached to the vacuum drum main body 55 of the upper second vacuum drum 30, the advancing / retreating of the peeling projection 36 relatively changes the rotation phase of the vacuum drum main body 55 relative to the cutter cylinder 26 (forward). Or retreat). However, the vacuum drum main body 55 originally rotates in the same phase as the cutter cylinder 26, and nevertheless, it is necessary to advance the peeling projection 36 with respect to the rear end of the cut sheet. It is important how the phase is advanced with respect to the cutter cylinder 26 during the rotation of the main body 55. In the present invention, by controlling the high-speed conveying means drive system motor 75 corresponding to the rotation of the cutter cylinder 26, the position (advance) change of the tip of the peeling protrusion with respect to the rotation speed of the printing press can be easily and electrically smoothed. In this way, effective braking and stable delivery of the cut sheet can be realized.

  The vacuum drum 33 in the low-speed conveying means 14 includes a vacuum drum main body 94 that rotates on the outer peripheral side, a hollow fixed shaft 95 that is positioned on the inside, and the like. The vacuum drum 33 is driven by being directly connected to the low-speed conveying means drive system motor 76, and is operated at about 1/15 of the web line speed. The vacuum drum main body 94 has a large number of suction holes 96 opened on the surface thereof, and the cut paper is adsorbed through the ventilation holes 97 of the hollow fixed shaft 95 and the suction holes of the vacuum drum within the range of both separators by the operation of the exhaust fan. . The output of the blower changes automatically and smoothly according to the speed of the printing press, ensuring stable conveyance.

  The vacuum box 35 as a whole has a box shape with an upper opening, and the upper opening is covered with a slit plate 93. The endless vacuum belt 34 is attached to the vacuum drum main body 94 so as not to be displaced and rotated, and the air exhauster is operated to perform suction from the vacuum box. The cut sheet is conveyed to the stack portion at a low speed while being sucked through the slit and the hole of the vacuum belt.

  The suction pressure of the vacuum drum 33 of the low-speed transport means 14 is about 20 kpa, which is higher than the suction pressures of the other vacuum drums 29 and 30. This is because the cut sheet conveyed at high speed is instantaneously decelerated to about 1/15. About 3/4 of the deceleration effect by catching the trailing edge of the cut sheet in the vacuum drum 33 is obtained by the direct contact of the trailing edge of the cut sheet with the vacuum drum 33. Also, the vacuum belt 34 catches the trailing edge of the cut sheet, decelerates it, and sucks it through the slit plate 93, so that the cut sheet can be stably conveyed while being tiled.

  Furthermore, in this embodiment, since the rotational speed of the rotary printing press is always detected using the high-precision rotation detection encoder 79, the signal is taken into the control circuit, and the output preset according to the rotational speed is sent to the blower and the exhaust. The fan can be commanded, and the output of the blower and exhaust fan can be automatically controlled over the entire rotation range under the optimum conditions commensurate with the rotational speed of the printing press. As a result, it is possible to prevent the occurrence of problems such as flapping of the cut sheet, generation of scratches, and popping out in the entire rotation range from the low speed range to the high speed range, and particularly the high speed stability is improved.

1 is an overall configuration diagram showing an embodiment of a theta for a printing press according to the present invention. Explanatory drawing of the high-speed conveyance means and low-speed conveyance means. The schematic block diagram of each drive system. The block diagram of the whole drive system. Explanatory drawing which shows the position of the protrusion for peeling at the time of low speed driving | operation. Explanatory drawing which shows the position of the protrusion for peeling at the time of high-speed driving | operation. The graph which shows the relationship of the protrusion tip advance amount with respect to printing machine rotation speed. Explanatory drawing of an entrainment prevention plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Web 11 Infeed part 12 Cut part 13 High speed conveyance means 14 Low speed conveyance means 16 Stack part 22a 1st draw roller 22b 2nd draw roller 26 Cutter cylinder 29 Upper 1st vacuum drum 30 Upper 2nd vacuum drum 33 Low speed vacuum drum 36 Separation protrusion 70 Coupling 71 In-feed section drive system motor 72a, 72b, 72c, 72d, 72e Timing pulley 73a, 73b Timing belt 74 Cut section drive system motor 75 High-speed transport means drive system motor 76 Low-speed transport means drive system motor

Claims (2)

An in-feed portion having a draw roller for taking in a web supplied from a printing press, a cut portion for cutting the web into sheets of a predetermined size with a rotating cutter cylinder, and a high-speed conveying means provided on the downstream side of the cut portion And a low-speed conveying means for conveying the cut cut sheets in a tiled state, and a stack portion for stacking the cut sheets, wherein the high-speed conveying means is opposed to the low-speed conveying means and is positioned above and rotates at a high speed vacuum. A separation protrusion is arranged on the outer periphery of the high-speed vacuum drum in parallel with the rotation axis, and the trailing edge of the cut sheet is pushed down by the separation protrusion to transfer the cut sheet from the high-speed conveyance unit to the low-speed conveyance unit. In the theta for a printing press that is transferred to a tiled state,
The infeed unit drive system, the cut unit drive system, the high-speed conveyance unit drive system, and the low-speed conveyance unit drive system are individually driven by a motor, and the cut unit drive system motor transmits the rotation signal of the printing press. In response, the cutter cylinder is controlled to rotate synchronously, and the other motors are controlled to rotate with a predetermined relative relationship in response to the rotation signal, and the high speed vacuum drum of the high speed conveying means is When the cutter cylinder rotates at a constant speed, it rotates synchronously with the cutter cylinder, and when the cutter cylinder rotational speed changes, a high-speed conveying means drive system motor is set so that the advance angle is set in advance. The theta for a printing machine, characterized in that the speed is controlled by the printer. Draw rollers of the infeed unit, the printing machine theta of claim 1 Symbol placement is speed controlled by the in-feed section drive system motor so as to have a predetermined pull rate against the web running speed.

Images