JP4935237B2 - Intermittent blower - Google Patents

Description

The present invention relates to an apparatus for preventing quality defects such as plate fog by drying excess ink on a plate cylinder surface in a gravure printing machine.

  In gravure printing, a gravure roll whose surface is engraved with unevenness is dipped in the ink liquid layer, the ink adhering to the convex part is scraped off with a doctor blade, and the ink remaining in the concave part is supported This is a printing method for transferring to (in the case of direct gravure). Therefore, in order to print on the entire surface of the support, the uneven pattern is very fine and is a series of small dots, but it looks as if the entire surface was smooth roll coated by the preparation of printing ink and engraving method A uniform surface finish can be obtained. The application amount is adjusted depending on the shape, depth, mesh, solid content concentration of the ink, and the like of the gravure cell. The doctor blade is made of a hardened steel plate and is elastic with a thickness of 0.2 to 0.3 mm. It reciprocates from side to side to maintain uniform pressure on the gravure roll while maintaining uniform edge wear ( ± 10 mm).

  The ink ribbon for sublimation transfer according to the present invention is printed by separately printing each color of cyan, magenta, yellow, black and protective layer in each printing unit of the gravure printing machine by the gravure printing method. It is made by. That is, in each printing unit, the pattern of each color rectangular pattern is engraved as an image line part in an approximately quarter area of the cylinder, and the image line part is printed on the film substrate, and the other three-quarters are printed. The area has a pattern configuration in which ink is not applied as a non-image portion and only the fixed positions of the respective colors are printed sequentially in each printing unit. Hereinafter, such pattern printing is referred to as sequential printing. Therefore, as shown in FIG. 5, the image line portion of the gravure plate (hereinafter referred to as “plate cylinder”) handled this time has one side of the rectangular portion parallel to the plate cylinder axis.

  By the way, in the case of gravure printing, since the doctoring is performed on the plate to which the ink is attached, the ink should not be scraped off in the non-image area, but the printing speed is high. As a result, the ink slips through a slight gap between the plate surface and the doctor blade, and an extremely thin ink film remains on the non-image area of the plate. A defect in which this ultra-thin film of ink is transferred to a base material of a color to which the ink should not be transferred is called “plate fog”.

  When printing ink ribbon for sublimation heat transfer, the thickness of the ink in the image area is usually about 10 to 100 μm, while the ink film thickness remaining in the non-image area is 0.1 to 1 μm. When another ink is overcoated with another printing unit, it becomes a so-called ink contamination state, which causes defective products such as color density unevenness of specific colors when it is thermally transferred to photographic paper in the subsequent process. It is. Experience has shown that “plate fog”, which causes this density unevenness, is not a problem unless residual ink is transferred from the plate surface to the film substrate.

  Therefore, in the prior art, “plate fog” was prevented by using a method of blowing and drying the ultrathin film ink remaining on the plate surface (see JP-A-63-227341). According to the publication, when air drying is performed on the image area, when the plate depth is shallow, the solid content of the ink is high, and the solvent evaporation rate is high, the plate is “clogged” (cell Ink accumulates in the inside of the cell, and a cell is a hole in which the plate surface is sculpted), so that intermittent blown air that synchronizes the rotation of the plate and the blown air timing is blown only to the non-image area. Is going. In addition, since new ink does not enter the cell in the “clogged” plate, naturally, it is not transferred to the film base material, resulting in poor printing.

  Constituent elements of the plate fog prevention device using this intermittent blast are composed of a blower, a solenoid valve, a blower pipe, a blower nozzle, and a pattern detector. As an operation principle, first, air generated by the blower is blown intermittently by a solenoid valve based on a signal coming from the pattern detection unit, and the air is sent to the blower pipe and blown in the axial direction of the plate cylinder. This is a mechanism in which air is intermittently blown to the plate surface from a considerable number of blowing nozzles attached to the pipe. Therefore, by design, the air from the nozzle should be blown in the non-image portion (non-picture portion) region, and the air blow should stop in the image portion (picture portion).

See JP-A-63-227341

  However, when the printing speed has been increased, the timing of discharging and discharging air from the nozzle to the solenoid valve has begun to be delayed due to the effects of air inertia resistance and compressibility. During high-speed rotation of the plate cylinder, air blowing stopped at the boundary at the beginning of the image area, and air blowing started at the later boundary. In other words, a phenomenon has occurred in which air is not blown to an image line portion where air should not be blown or air is not blown to a non-image line portion where air should be blown.

Originally, while the plate cylinder is rotating, air must stop at the boundary of the image line that comes first, and air must be discharged at the position of the subsequent boundary. When this happens, this phenomenon occurs. Therefore, since air is blown to the image area, the above-described “clogging” of the plate occurs, and air is not blown to a part of the non-image area, which causes “plate fogging”. Decided to do.

As a result of various studies to solve the above problem, the present inventor is a device that blows a certain amount of air to a certain place on the circumferential surface of the plate cylinder of the printing press, and is sent from the blower An air switching valve capable of opening and closing air and a plate surface blowing unit are provided, and the plate surface blowing unit is rotated by a transmission directly connected to a motor, and the closed inner rotating cylinder into which the air is blown, and the inner rotation The cylindrical body has a slit that allows air to escape in parallel to the rotation axis of the inner rotating cylinder, and the outer rotating cylinder has a closed outer fixing that holds the inner rotating cylinder. A cylindrical body, the outer fixed cylindrical body is fixed to a frame of a printing press, and slits are formed on the circumferential surface of the outer fixed cylindrical body, and are parallel to each other; Intermittent feeding characterized by The wind device has been found and the present invention has been achieved.

Furthermore, in order to blow out the air in a timely manner, the inventor is in the intermittent air blower, and the intermittent air blow control for the plate surface air blower is performed by detecting an image line provided at an end portion of the rotary shaft of the plate cylinder. And a control unit that can synchronize the printing speed of the printing press and the rotational peripheral speed of the inner rotating cylindrical body by sending the signal of the image line unit detected from the image line detection unit to the control unit of the motor. Further, the control unit can also control the air switching valve so that air can be blown out at a position where the slit position of the inner rotating cylindrical body overlaps with the slit position of the outer fixed cylindrical body by the signal. The intermittent air blower according to claim 1 is found, and the present invention has been completed.

That is, the present invention is a device for blowing a certain amount of air to a certain place on the circumferential surface of a plate cylinder of a printing press, and is an air switching valve and a plate surface blowing section capable of opening and closing air blown from a blower The plate surface air blower is rotated by a transmission directly connected to a motor, and a closed inner rotating cylindrical body into which the air is blown, and a slit for releasing air on the circumferential surface of the inner rotating cylindrical body. The outer rotating cylinder has a closed outer fixed cylinder that holds the inner rotating cylinder outside the inner rotating cylinder, and the outer fixed cylinder is parallel to the rotation axis of the inner rotating cylinder. become fixed to the frame of the printing machine, also the circumferential surface of the outer stationary cylinder is slit formed, and it is in parallel relation to each other, further, in order to blow out the air timely, the printing plate Intermittent air blow control to the wind section, sending the plate and streaked detecting portion provided at an end portion of the rotary shaft of the cylinder, a signal of the image area detected from該画ray detector to the control unit of the motor The control unit that can synchronize the printing speed of the printing press and the rotational peripheral speed of the inner rotating cylinder, and further, the position of the slit of the inner rotating cylinder overlaps the position of the slit of the outer fixed cylinder by the signal. The present invention relates to an intermittent air blower characterized by comprising the control unit that can also control an air switching valve so that air can be blown out at a position.

As described above, according to the intermittent air blower of the present invention, air is blown out on the boundary line between the image line part and the non-image line part on the rotating plate cylinder surface, and the boundary between the non-image line part and the image line part. The air can now be accurately blown on the wire. Therefore, printing defects such as “clogging” that has conventionally been caused by blowing air to the image area and “plate fog” that has been caused by the delay in blowing air to the non-image area can be reliably resolved. I was able to do it.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a printing configuration of a gravure printing machine, in which a plate cylinder 1 and an impression cylinder 2 are pressed against each other, and printing is performed by passing a printed product 3 between the cylinders. In FIG. 1, the plate cylinder 1 is immersed in the ink 5 immersed in the ink pan 4, and after the ink 5 is transferred to the plate surface 28, the plate surface is rotated in the clockwise direction in the figure. After the ink other than the ink in the cells of the plate surface 28 is scraped off by the doctor blade 6 abutted on the plate 28, the non-imaged portion 27 receives air by the plate surface blowing unit 7 of the intermittent blower of the present invention. The slight ink left behind by the blade is dried, and the image line portion 26 is not blown, but the plate cylinder surface enters the impression cylinder, and only the ink in the cell is transferred to the printed matter 3.

FIG. 2 is a cross-sectional view of the plate surface air blowing unit 7 and shows a configuration in which the inner rotating cylinder 9 is accommodated in the outer fixed cylinder 8. An air blowing slit portion 12 is provided in a part of the outer fixed cylindrical body 8 and is parallel to the outer fixed cylindrical axis, and the length of the slit is substantially the same as the cylinder width. The width of the slit may be around 5 mm. A solid line portion of the inner rotating cylindrical body 9 is an air shielding portion 10, and a dotted line portion indicates an air blowing portion (mesh shape) 11. The length of the shielding part 10 and the blowing part 11 in the circumferential direction is approximately 1: 3. This ratio corresponds to the ratio of the lengths of the image line portion 26 and the non-image line portion 27 in the circumferential direction of the plate cylinder being approximately 1 to 3, and the shielding portion shields the air blowout to the image line portion. Have a role.

FIG. 3 is a perspective view of the inner rotating cylinder 9. Three-quarters of the surface of the cylindrical body that corresponds to the body has a mesh shape, which corresponds to the air blowing portion 11 blown into the cylindrical body, and the remaining one-fourth area is the air shielding portion 10. It corresponds to.

FIG. 4 is a perspective view of the outer fixed cylindrical body 8. An air blowing slit portion 12 is provided on the body surface of the outer fixed cylindrical body, the direction is parallel to the cylindrical axis, and the length is substantially the same as the cylinder width.
In addition, the left side surface 23 and the right side surface 24 of the outer fixed cylindrical body form wall surfaces so that the air blown in does not leak out, but air is introduced into a part of the left side surface (or the right side surface). A drive shaft penetrating opening 22 for driving the nozzle opening 21 and the inner rotating cylindrical body is disposed.

FIG. 5 is a perspective view showing a related position when the intermittent blower for preventing plate fogging according to the present invention is mounted near the plate cylinder. An image line detection unit 13 is installed in the chuck portion of the plate cylinder 1. The image line detection unit 13 causes the A detection unit 14 and the B detection unit 15 to slide alternately to have a length on the circumference of the image line unit 26. Thus, the detection unit 13 can be set regardless of the circumference of the plate cylinder 1.

The plate surface blowing section 7 is located between the doctor blade 6 and the impression cylinder 2 (see FIG. 1), and includes an air blowing pipe 18 and an air blowing nozzle (slit section) 12 that opens to the entire width of the printing cylinder 1 at its tip. Is formed. An air switching valve 17 is attached to the air blower pipe 18, and the switching valve 17 is opened and closed by a signal from the sensor 16. The sensor 16 may be of any type such as a photoelectric type or a proximity type, and the opening and closing of the switching valve 17 is controlled by a signal 16 from the image line detection unit 13. That is, the switching valve is closed by the signal (determined by the length of the width formed by the A detection unit 14 and the B detection unit 15) that detects the position of the image line portion, the blowing is stopped, and the switching valve 17 is used during the other periods. And air is blown to the air blowing nozzle 12.

The plate surface blowing section 7 is formed by an outer fixed cylindrical body 8 and an inner rotating cylindrical body 9, and a transmission 19 in which the rotation shaft of the inner rotating cylindrical body 9 is disposed outside the outer fixed cylindrical body 8. The transmission 19 is driven by a dedicated motor 20. The rotation control of the motor 20 is performed by taking in the signal of the sensor 16 that detects the position of the image portion 26. That is, if the printing speed increases, the number of rotations of the plate cylinder 1 increases, and the number of times of detecting the position of the image line portion 26 increases. Therefore, the position detection signal of the image line portion 26 is taken in and the inner rotary cylinder 9 is driven. The number of rotations of the motor 20 can be increased proportionally.

That is, according to the present invention, if the rotation speed of the plate cylinder is increased, the opening / closing time of the air switching valve is shortened, and at the same time, the rotation speed of the inner rotating cylinder is increased, and the width of the slit of the inner rotating cylinder is constant. Therefore, it can be seen that the air blowing time and the air blowing stop time are also shortened, and that the time of the non-image portion and the image portion passing under the slit of the outer fixed cylindrical body is also shortened.

In this way, when air is blown intermittently on the plate surface, the air itself is opened and closed using a switching valve or the like, and at the same time, physical opening and closing at the blow-off end portion is performed at the same time, and the initial accurate blowing effect can be obtained. It was.

It is sectional drawing of the printing unit of a gravure printing machine, and it turns out that the position of the ventilation part 7 of this invention exists between the doctor blade 6 and the impression cylinder 2. FIG. FIG. 6 is a cross-sectional view of the plate surface blowing unit 7, and an inner rotating cylinder 9 is provided in an outer fixed cylinder 8. It is also a relationship diagram between the slit 12 of the outer fixed cylindrical body and the slit 11 (dotted line portion, mesh shape) of the inner rotating cylindrical body. It is a perspective view of the inner side rotating cylindrical body 9, and it can be seen that the area of the air blowing portion 11 is substantially three times that of the air shielding portion 10 that stops air blowing. 3 is a perspective view of an outer fixed cylindrical body 8. FIG. The parts other than the air blowing slit portion 12 which is a blower port are used in a sealed state. It is the perspective view which attached the intermittent air blower to plate cylinder 1 vicinity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Pressure cylinder 3 Printed material 4 Ink pan 5 Ink 6 Doctor blade 7 Plate surface ventilation part 8 Outer fixed cylindrical body 9 Inner rotation cylindrical body 10 Air shielding part 11 Air blowing part (mesh shape)
DESCRIPTION OF SYMBOLS 12 Air blowing slit part 13 Image | line part detection part 14 A detection part 15 B detection part 16 Sensor 17 Air switching valve 18 Blower pipe 19 Transmission 20 Motor 21 Air nozzle opening part 22 Drive shaft penetration opening part 23 Outer fixed cylinder Left side 24 Outer fixed cylinder right side 25 Blower 26 Drawing part 27 Non-drawing part 28 Plate surface

Claims (2)

A device for blowing a certain amount of air to a certain place on the circumferential surface of a plate cylinder of a printing press , comprising an air switching valve capable of opening and closing air blown from a blower and a plate surface blowing section, the plate surface The blower unit is rotated by a transmission directly connected to a motor, and the closed inner rotating cylinder body into which the air is blown, and a slit for releasing air on the circumferential surface of the inner rotating cylinder body are provided on the inner rotating cylinder body. The outer rotating cylinder has a closed outer fixed cylinder that holds the inner rotating cylinder, and the outer fixed cylinder is fixed to the frame of the printing press. In addition, the intermittent air blower is characterized in that slits are also formed on the circumferential surface of the outer fixed cylindrical body and are parallel to each other. In the intermittent air blower, the intermittent air flow control for the plate surface air blower is performed by an image line detection unit provided at an end of a rotation shaft of the plate cylinder, and an image line unit detected from the image line detection unit. By sending a signal to the control unit of the motor, the control unit that can synchronize the printing speed of the printing press and the rotational peripheral speed of the inner rotating cylinder, and further, the position of the slit of the inner rotating cylinder is determined by the signal. The intermittent blower according to claim 1, further comprising: the control unit that can also control the air switching valve so that air can be blown out at a position overlapping the position of the slit of the outer fixed cylindrical body.

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