JPS58201653A - Rotary printing machine - Google Patents

Abstract

PURPOSE:To enable to conduct intermittent printing such as naming printing on a rotary printing machine without any irregularity in printed images, by a method wherein a drive source for a form cylinder and a drive source for feeding a material to be printed are provided in separate systems, and the material to be printed is fed at an arbitrary speed while a printing plate fitted onto the form cylinder is not opposed to an impression cylinder. CONSTITUTION:A (main) motor 43 for constantly driving a form cylinder 35 to rotate and a drive source, for example, a stepping motor 51, for a feeding cylinder 29 for feeding the material to be printed between the form cylinder 35 and an impression cylinder 28 are separately provided, and the material to be printed is fed at a velocity (a high velocity, a low velocity or stoppage) different from the circumferential velocity (printing speed) of the form cylinder 35 while the printing plate fitted to the cylinder 35 is not opposed to the cylinder 28, whereby printing pitch is varied. Since the form cylinder 35 is continuously rotated, irregularity in printed images can be prevented from being generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary printing press capable of performing intermittent printing such as master printing.

Conventionally, master printing has generally been sheet-fed printing, and there are various problems when using rotary presses, so the use of rotary presses has been limited to special cases. In other words, in the case of a rotary printing press, the amount of material to be printed is determined by the circumferential speed of the pressure roll that comes into contact with the plate roll, so it can only be used for machines with a constant printing pitch. In order to change the pitch, plate rolls, etc. of different diameters must be used. Therefore, rotary printing presses lack versatility and have the disadvantage of being troublesome to replace, so rotary printing presses are only used when printing at a constant pitch or when it is acceptable to replace plate rolls.

It is also possible to vary the printing pitch by intermittently driving the plate roll, but in this case, printing unevenness occurs due to ink drying when the printing plate is stopped, which is not practical.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary printing press that does not require plate roll replacement work and is capable of performing master printing without uneven printing.

In the present invention, a printing material drive source for transporting printing material inserted between a printing roll and a pressure roll is provided as a separate system from a driving source for the printing roll, and the printing material driving source is used to transfer the printing material to the printing material roll. Printing is performed by utilizing the time when the attached plate is not facing the pressure roll to feed the printing material at a speed different from the speed at which the printing material is transported by the plate roll, for example, by feeding the plate roll at high or low speed, or by stopping the plate roll. While the pitch is different,
The plate roll is rotated continuously to prevent uneven printing, thereby achieving the above objective.

Hereinafter, a structure in which an embodiment of the present invention is combined with a plastic film bag making machine will be described with reference to the drawings.

In FIG. 1, a feed roll unit 70 is attached to one side of the printing press frame 11, and this unit 7
0 is equipped with a pair of upper and lower rolls 71 and 72 whose interval can be adjusted, and the lower roll 72 is driven by a motor (not shown), and a plastic film original fabric 100 as a printing medium is placed on an original fabric table 75. can be played out sequentially.

This original film is constructed by rolling a cylindrical plastic film formed by an inflation method or the like and crushing it along the longitudinal direction into a belt shape.

At the top of the frame 11, the first . A second free roll 12.13 is rotatably supported, and
Two first and second dancer rolls 15, 16 are rotatably supported via the swing arm 14, and the strip-shaped plastic film 101 fed out from the feeding roll unit 70 is transferred to the first free roll 12. The first dancer roll 15, the free roll 13 of tIPJ2, and the second dancer roll 16 are rotated in this order and then sent upward t7. The positions of these dancer rolls 15 and 16 are determined by controlling the rotational speed of the main motor, which will be described later, by a variable resistor 18 (see FIG. 2), which serves as angle detection means and is provided on the fulcrum shaft 17 of the swing arm 14. From K, it is made to fall within a predetermined range.

On the frame 11, pillars 19 made of four round bars etc. are erected, and between these pillars 19, the two front and rear pillars 19 on the right side in FIG. It is installed so that its vertical position can be adjusted. This detector'll520Fi mounting base 2], a detector body 22 mounted on this mounting base 21 and consisting of a light emitting element, a reflected light receiving element, etc., and a third free roll rotatably supported on the mounting base 21. 23, and serves as a trap for detecting printing position marks previously formed on the plastic film 101 at the printing location.

An upper frame 25 is mounted on the support column 19, and a fourth frame 25 is mounted on the right side of the frame 25. A fifth free roll 26,27 is rotatably supported. Further, on the left side of the frame 25, as shown in an enlarged view in FIG. 3, a pressure roll 28 is rotatably supported.
A feed roll 29 is supported to rotate freely and move freely in a direction approaching the pressure roll 28, and furthermore, this feed roll 29
A tension coil spring 3 is installed between the support shaft 30 and the frame 25.
1 is stretched so that the feed roll 29 contacts the pressure roll 28 with a predetermined pressing force. As shown in 1 above, the pressure roll 2B is made of a hard roll such as a gold IAO roll, and the feed roll 29 is made of an elastic roll such as an im roll. Furthermore, the plastic film 101 that has been passed around the second dancer roll [6] is transferred to the third free roll 23, the free roll 26 of @4, the feed roll 29. It is wound around a pressure roll 28 and a fifth free roll 27.

A plate roll 35, an anilox roll 36, and an ink roll 37 are rotatably supported by the left front and rear columns 19 from above via bearing boxes 32, 33, and 34, respectively. The distance between each of the rolls 35, 36, 37 and between the plate roll 35 and the pressure roll 28 is the same as that between each bearing box 32, 33° 34 and between the bearing box 32 and the upper frame 25.
Each interval can be adjusted by interval adjustment means 38 provided between the two without affecting other intervals. Each of the interval adjustment means 38 is connected to each bearing box 3.
2 m long fixing nuts 39.40 with opposite threads fixed to the opposing surfaces of 2, 33, and 34 and the opposing surface of the upper frame 25, respectively; and ζ' with screw shaft 41
and a nut 42 that is fixed to the center of the screw shaft 41 and rotates the screw shaft 41, and by turning this nut 42, the upper and lower fixing nuts (39, 40) can be moved toward or away from each other at the same time. , and each interval can be adjusted from this K. In addition, the screw shaft 4
The protruding parts from the fixing nuts (1) 39 and 40 are underholes 25A provided in the upper frame 25 and each bearing box 32, 33, and 34, respectively.

32A, 33A, and 34A.

A main motor 43 with an inverter as a plate roll drive source is attached to the left side of the upper frame 25 in FIG. A second gear 46 is connected to one end of the central shaft 28A of the roll 28 (see W@ in Fig. 3) via a one-way clutch 45 (see fIfI in Fig. 2) as an interlocking and connecting means, and the center of the plate roll 35. tR3 gear 47 fixed to one end of shaft 35A, anilox roll 36
A fourth gear 48 fixed to one end of the central shaft 36A of the ink roll 37 and a fifth gear 49 fixed to one end of the central shaft 37A of the ink roll 37 are sequentially meshed with each other.
．． 35, 36, and 37 rotate at a predetermined rotation ratio. At this time, the one-way clutch 45 is configured to allow rotation of the pressure roll 28 by the second gear 46 as well as rotation in the speed increasing direction. In addition, the outer circumferential length of the pressure roll 28 and the pitch circumferential length of the second gear 46, similarly, the circumferential length including the outer surface of the plate roll 350 and the third gear 47.
The pitch circumferential length of the anilox roll 36 and the pitch circumferential length of the fourth gear 48 are made equal to each other.

At the other end of the central axis 28A of the pressure roll 28? -1. A stepping motor 51 with both shafts is connected at one end of its output shaft, and a coupling 5 is connected to the other end of the output shaft of the motor 51.
2, a rotary encoder 53 as a means for detecting the feeding amount of the printed material is connected to the rotary encoder 53.
The feeding amount of the plastic film 101 as the printing material can be detected. Further, a predetermined plate 54 made of rubber or the like can be fixed to the surface of the plate roll 35, and a rotary encoder as a rotation detecting means is connected to the other end of the central axis 35A of the plate roll 35 via a coupling 55. 56 are connected. This rotary encoder 56 is connected to the plate 54 fixed to the plate roll 35.
It is possible to detect how much snow is currently on the stepping motor 51, and the signal from the rotary encoder 56 is used to generate reference pulses for driving and stopping the rotation of the stepping motor 51, as well as the speed at the time of driving. ing. Furthermore, the ink reservoir 57 is supported by the column 19 in a state in which the lower part of the ink roll 37 is inserted in the lower part of the ink roll 37 .

A heat index 59 is attached to the upper frame 25 via a support leg 58, and a plurality of sheathed heaters 60 are arranged within the heat index 9 along the feeding direction of the plastic film 10. . Two blower boxes 61 are attached to the top of the heat exchanger 59, and a blower fan 62 is provided in each of these blower boxes 61, so that air can be sucked from above each blower box 61. This air is heated by a heater 60 and blown onto the printed surface of the film 101, so that the printed surface can be forcedly dried.

A bag making machine frame 81 is provided on the right side of the printing machine frame 11 in FIG. This frame 81 has
A dancer roll 83 is rotatably supported via a swing arm 82. The position of the dancer roll 83 is detected by an upper limit position detecting means 84 and a lower limit position detecting means 85 each consisting of a pair of light emitting elements and a light receiving element, and the dancer rolls 83 are fed out within a predetermined range. -Ruyuni)
70 motor speeds can be controlled.

A bag making unit 86 is mounted on the bag making machine frame 81, and inside the bag making unit 86 there is a pinch roll 87 that feeds a plastic film 101 by a predetermined amount, and a pinch roll 87 that heat-welds the plastic film 101 to form a bag. A pair of seal heaters 88 forming the bottom and a plastic film 101 are cut near the heat welded part to make each bag 1.
02 cutter 89 is housed therein. The plastic film 101 sent out from the fifth free roll 27 of the upper frame 25 is wound around a dancer roll 83, then taken up by a bin fC'-A/87, and sent one bag at a time. It looks like this.

Furthermore, a storage box 90 for receiving the bags 102 cut by the cutter 89 is attached to the right side of the bag making machine frame 81.

Next, the operation of this embodiment will be explained.

Plastic film 1 (1
1, the free rolls 12, 13° dancer rolls 15, 16, and free rolls 23° 27 of the printing press are passed through the feed roll 29 and pressure roll 28, and then passed through the free roll 27 to the bag making machine. He is sent to the side. At this time, since the center shaft 28A of the pressure roll 28 is connected to the output shaft of the main motor 43 via the one-way clutch 45,
Plastic film 1n lid, May 7Mo-74
The plate roll 35, anilox roll 36, and ink roll 37 are also connected to the main motor 43 via gears 44, 46 to 49, so that they can be fed at a predetermined speed. is being rotated at a speed of In addition, the feed amount of this plastic film 101, that is, the rotation speed of the pressure roll 28, and the plate roll 35
The rotation speed is determined by rotary encoders 53 and 5, respectively.
6 has been detected.

In such a situation, if the trailing edge side of the plate 54 attached to the plate roll 35 deviates from the position facing the pressure roll 28, that is, the printing position, when the plate 54 is rotated, this deviation causes the rotary rotation of the plate roll 54 to move. It is detected from the grid signal of the encoder 56, etc., and this detection signal is seen in the drive circuit of the stepping motor 51, and the motor 51 is started. This stepping motor 51 is operated using a signal from a rotary encoder 56 as a reference signal (clock), and its rotation speed is controlled by the main motor 43 and the pressure roll 28 via the second gears 44 and 46.
The rotation speed has been increased. Therefore, when the stepping motor 51 is driven, the pressure roll 28 is driven by the main motor 43 by the action of the one-way clutch 45 at a predetermined high speed, for example, about 2 to 5 times faster than when the plate 54 is in contact. The plastic film 101 is also fed at a high speed.During this high speed transfer,
When the print position mark previously formed on the plastic film 101 is detected by the print position mark detection mechanism 20, the stepping motor 51 is stopped, and the pressure roll 28 is again driven by the main motor 43. . When the stepping motor 51 is stopped, the leading edge of the printing plate 54 is substantially opposed to the pressure roll 28, and printing can be started.

When the stepping motor 51 is stopped and the pressure roll 28 is driven by the main motor 43, the plate 54
and pressure roll 28 are opposed to each other and simultaneously rotate at the same speed in opposite directions. Titration printing is performed using the ink supplied to the plate 54 via the printing ink roll 37 and the printing roll 36, and after printing is completed, the plastic film 10] [stepping motor 5]
1, it is sent at high speed.

On the other hand, the printed plastic film [0] is dried by the hot air blown from the heat index 59 by the action of the blower fan 62, and then transferred to the bag making machine via the fifth 71 roll 27. and is sent out. Printed plastic film 10 sent to this bag making machine side
1 is taken up by a pinch roll 87 via a dancer roll 83, and is intermittently fed by a predetermined length, and when this feeding stops, K
The seal heater 88 and the cutter 89 are operated each time one mouth is opened to seal and cut the bottom of the bag, and the bag 102 thus formed is stored in the opened storage box 90. At this time, the timing of the intermittent feeding by the pinch roll 87 is determined by signals from the plate roll, the O-tary encoder 56 of 35, or the printing alignment mark detector 20.

Thereafter, by repeating the same operations, master pitch printing and bag making are successively performed. During this operation, the movement above the dancer roll 83 of the bag making machine beyond the lower limit position detection means 84.
This can be done by changing the feeding speed of the feeding roll unit 70 of 0, and the dancer roll 15.16 of the printing press.
The main motor 4 moves up and down due to changes in the resistance value of the variable resistor 18 attached to the fulcrum shaft 17 of the swing arm 14.
This is done smoothly by operating the inverter 3 or the like to adjust the rotational speed of the main motor 43.

According to this embodiment as described above, the plate 54 of the plate roll 35
The plastic film 101, which is the printing target, is used when the film is not facing the pressure roll 28, that is, during non-printing.
The stepping motor 5J was designed to send at high speed.
The printing pitch can be freely set by appropriately setting the number of rotations of the plate roll 35, and the troublesome operation of changing plate rolls 35 is often not necessary. Furthermore, since the plate roll 35 is continuously rotated, uneven printing due to ink drying does not occur. Furthermore, the bag making machine and the printing machine can be easily combined by simply reattaching the feeding 10-ru unit 70 of a general bag making machine to the printing press frame 11. In addition, since high-speed feeding of the plastic film 101 requires only the pressure roll 28 to be rotated, a quick response can be achieved.

In addition, in the above embodiment, the plastic film 1
Although the high-speed feeding of 01 was carried out by rotating the pressure roll 28, this may also be carried out by attaching a stepping roller to the feeding roll 29. In order to ensure that
A feed roll unit 91 may be provided upstream of the roll 28 to serve as a driving means for intermittent feeding of the printed material. At this time, when the feed roll unit 91 is used, it is not necessary to provide the one-way clutch 45 on the central axis 28A of the pressure roll 28, and the pressure roll 28 can be fed by sliding on the circumferential surface of the pressure roll 280. Additionally, the one-way clutch 45 can be configured with a clutch such as an electromagnetic clutch, and in this case, the pressure roll 28 can be fed at a speed lower than the rotational speed of the plate roll 35, and in extreme cases, it can be stopped. This makes it possible to set the printing pitch to be less than or equal to the circumferential pitch of the plate roll 35, and even to perform gapless printing. Further, the stepping motor 5 may be a controlled motor of another type, such as a motor.

It is best to replace the anilox roll 36 with a general doctor. Furthermore, each of the hollow holes 25 of the interval adjustment means 38
A, 32A, 33A, and 34A are suitable as screw holes that match the screws at both ends of each screw shaft 41, and in this case, each fixing nut) 39.40 can be used as a double lock nut, making the fixation more secure. Can be done.

Furthermore, although the present invention has been described in the above embodiments in combination with a bag-making machine, the present invention is not limited to this, and can be used as a stand-alone printing machine, and can also be used in combination with other machines. You can also Furthermore, the material to be printed is not limited to the cylindrical plastic film 101, but can also be applied to paper or other materials or shapes. Further, a microcomputer may be used to control the feed of the printing material, printing pitch, etc. In this case, the printing position mark detection mechanism 20 is not necessarily provided, but if provided, only the length is checked. becomes. In other words, since there is almost no cost in the length of one bag, the program for feeding the next bag is set based on the length data of the previous bag, and the stepping motor 51 is operated to reduce the cumulative error. can be eliminated. Therefore, alignment of the detection mechanism 20, etc. is not necessary. Furthermore, if there is no printing position mark on the plastic film 101, a microcomputer feeding length value may be input and the film may be fed by a fixed amount based on this set value.

As described above, according to the present invention, it is possible to provide a rotary printing press that does not cause uneven printing and can change the printing pitch with a simple operation.

[Brief explanation of drawings]

FIG. 1 is a front view showing a schematic configuration of an embodiment of the present invention combined with a bag making machine, FIG. 2 is a side view taken approximately along line nn in FIG. 1, and FIG. The enlarged cross-sectional view taken along the line 1-2 of the main part of the figure, FIG. 4, and FIG. 5 are schematic configuration diagrams showing other embodiments of the present invention. 11...Printing press frame, 28...Pressure roll, 29
... feeding roll, 35... plate roll, 37... ink roll, 38... spacing adjustment means, 43... main motor as plate roll drive source, 45... interlocking station cutting and [7 one-way clutches, 51... stepping motor as a driving source for inspection print, 54... plate,
56...Rotary encoder as rotation detection means,
91...Feed 0-le unit. Agent: Patent Attorney Minoru Kinoshita Figure 2, Figure 3, Figure 5, Figure 1

Claims (1)

[Scope of Claims] (1) Rotary printing, which includes a pressure roll facing a plate roll, inserts the printing material between the plate roll and the pressure roll, and prints sequentially as the plate roll rotates. In the machine, a drive source is provided to constantly rotate the plate roll, and when the plate attached to the plate roll is not opposed to the pressure roll, the substrate is driven at a speed different from that when the plate is opposed to the pressure roll. A rotary printing machine that is equipped with a driving source for printing materials. (2. In Claim 1, the pressure roll #
In addition to being connected to the driving source of the 'ip & o-roll, an interlocking connection means consisting of a one-way clutch, an electromagnetic clutch, etc. is provided in the middle of this connection, and a feed roll is pressed against the circumferential surface of this pressure roll. , Gah, either the pressure roll or the feed roll has a stepping motor on one side,
A rotary printing press characterized in that a rotation control motor is connected to a servo motor or the like as a printing material drive source. (3) Permissible scope of claims In paragraph 2, the rotation control motor is a stepping motor, and the reference torque for driving the stepping motor is set to rotation detection means for detecting the rotation of the plate roll. A rotary printing press characterized by a force-first mechanism.