JPH11291443A - Gravure printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to improve the working efficiency in a stage changing and that in the cleaning after the finish of printing by a method wherein a plate cylinder is driven at its cleaning position and, at the same time, the cleaning of the plate cylinder and a cascade is carried out by supplying a cleaning solvent to the cascade. SOLUTION: By changing-over an ink dupply with the changing-over means of an ink supplying means N after the finish of one printing, a cleaning solvent is supplied to a cascade 50 at a printing position P so as to pre-clean a plate cylinder 3 and an ink roller 46 under driving state. By this pre-cleaning, the cylinder and sealing means of the ink supplying means N and a doctor are cleaned and, at the same time, the ink adhering to the plate cylinder 3 and the ink roller 46 is prevented from being dried during its movement to a cleaning position. As a result, a cleaning process can be carried out even during printing at the printing position and, at the same time, a cleaning is carried out by driving the ink roller 46 with a cleaning driving means, resulting in allowing to improve a cleaning capability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure printing machine, and more particularly to a technique suitable for use in a multi-arm turret type plate cylinder gravure printing machine capable of reducing working time.

[0002]

2. Description of the Related Art Gravure printing is usually performed using several colors, and printing is continuously performed by arranging printing units by the number of colors to be used and passing through a film.

When changing the printed matter, all the printing units must be stopped and the plate cylinder and the ink must be replaced. However, replacing the plate cylinder and the ink requires a considerable amount of time. Since it takes a long time to replace the unit, there is a problem that when multiple types of printing are performed with a short printing length, the printing efficiency is significantly reduced.

[0004] A "printing unit for a gravure printing machine" that solves this problem is disclosed in Japanese Patent Application Laid-Open No. Hei 9-141823. This publication describes a printing unit of a multi-arm turret type gravure printing machine in which a plurality of plate cylinders are provided so as to be able to print alternately. In the printing unit of this gravure printing machine, an ink supply roller of a type that oozes ink from pores on the surface is described, and an ink supply system of a type in which a plate cylinder is dipped using an ink pan may be used. Are listed.

[0005]

However, even in the printing unit of the gravure printing machine disclosed in the above-mentioned publication, there is a demand for further shortening the procedure required for step change. Further, the ink supply roller disclosed in the above publication has a problem that the internal structure of the ink supply roller is complicated, and it is difficult to clean the ink supply roller when it is attached to a printing press. In addition, in the ink supply method of the type of immersion, when replacing the plate cylinder, it is necessary to replace and wash the ink pan, and there is a problem that the amount of work is increased.In particular, in the replacement and cleaning of the ink pan, There is a problem that a steel or stainless steel ink pan weighs about 8 kg, which places a heavy burden on operators who perform replacement and cleaning.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve the work efficiency in step change and the work efficiency in cleaning after printing is completed.

[0007]

According to the present invention, a plurality of units each including a plate cylinder and an ink supply device for supplying ink to the plate cylinder are provided so as to be movable at least at a printing position and a washing position. An impression cylinder for pressing a film against the plate cylinder, a doctor for scraping excess ink from the surface of the plate cylinder for the unit at the printing position, and an ink and a cleaning solvent for the ink supply device. Ink supply means for switchably supplying ink to the plate cylinder, the ink supply device comprising: an ink roller pressed against the surface of the plate cylinder; and an ink supply portion at a boundary between the ink roller and the plate cylinder. A cascade for supplying a solvent for cleaning is provided. In the cleaning position, the plate cylinder is driven, and a cleaning solvent is supplied to the cascade to clean the plate cylinder and the cascade. It has solved the above problems by Ukoto. The present invention is applied to a technique in which the ink supply unit switchesably supplies ink and a cleaning solvent to a cascade of printing positions, and supplies a cleaning solvent to a cascade of cleaning positions. Further, in the present invention, the supply of the cleaning solvent at the cleaning position can be set in a range of 1 minute to 10 minutes. Further, in the present invention, a cleaning drive unit for rotating and driving the ink roller at the cleaning position may be provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gravure printing machine according to the present invention will be described below with reference to the drawings. 1 to 5, reference numeral 1 denotes a plate cylinder driving unit, 2 denotes a film running and drying unit, 3 denotes a plate cylinder, 4 denotes an impression cylinder, and 5 denotes a doctor.

In this embodiment, a plurality of printing units are arranged in a row on the gravure printing machine, and a plate cylinder driving unit 1 is provided below the printing units as shown in FIG.
A film running and drying section 2 is provided on the plate cylinder driving section 1, and three plate cylinders 3, 3 and 3 are provided below the film running and drying section 2. The three plate cylinders 3 are arranged at a printing position indicated by a reference symbol P, a cleaning position indicated by a reference character W, and an exchange position indicated by a reference character T. Is the film running drying section 2
The film a is pressed by the impression cylinder 4 to perform printing, and the plate cylinder 3 at the printing position P is provided with a doctor 5 for scraping off excess ink from the plate cylinder 3.

FIG. 2 is a front view showing the details of the plate cylinder driving unit 1. In the plate cylinder driving unit 1, bearing cylinders 8, 8 face each other on the upright walls 7, 7 on both sides of the frame 6. Index drive shafts 9, 9 are rotatably supported on the bearing sleeves 8, 8, respectively, and index rotation plates 10, 10 are fixed to the ends thereof. Indexing rotary plate 10, 1
0, three support cylinders 11, 11, 11 at 120 ° intervals.
Are rotatably supported. A plate cylinder drive shaft 12 having a tapered portion 13 at the tip is rotatably and axially slidably fitted in each support cylinder 11, and a total of three plate cylinder drive shafts 12, 12 are opposed by a pair of plate cylinder drive shafts 12, 12. Each of the cylinders 3 is supported, and an assembling cylinder 15 for attaching and detaching the plate cylinder 3 by moving the plate cylinder drive shaft 12 forward and backward is attached to each support cylinder 11.

Each indexing rotary plate 10 has three intermediate gears 1
6 are rotatably supported. These intermediate gears 16 are composed of a sun gear 17 fixed to the tip of the bearing tube 8 and a support tube 11.
As shown in FIG. 1, the planetary gear 18 is fixedly engaged with the planetary gear 18. The intermediate gear 16 and the sun gear 17
And the planetary gear 18 have the same number of teeth.

Each indexing rotary plate 10 has the indexing rotary plate 1
An indexing rotation motor 19 for rotating 0 and 10 is connected. A chain 23 is wound around a sprocket 20 fixed to an output shaft of the indexing rotation motor 19 and a sprocket 22 fixed to an input shaft of a speed reducer 21. And a sprocket 27 fixed to an output shaft of the speed reducer 21.
Then, the chain 29 is wound around the sprocket 28 fixed to the connecting shaft 30. A chain 25 is fixed to the sprocket 24 fixed to the left side of the connecting shaft 30 in FIG.
Is wound. At the same time, the chain 32 is wound around a sprocket 31 fixed to the right side of the connecting shaft 30 and a sprocket 33 fixed to the indexing rotary shaft 9 above the sprocket 31. For this reason, when the indexing rotary plate 10 on the left side rotates by 120 ° by the driving of the indexing rotation motor 19, the indexing rotary plate 10 on the right side also rotates by the same angle. 1 to 3
As shown in FIG. 5, when the upper plate cylinder 3 comes directly above, the positioning pin (not shown) provided on the frame 6 is moved to the indexing rotary plate 1.
The indexing plates 10 and 10 on both sides are fitted into positioning holes (not shown) provided at the position 0, and the plate cylinder 3 is also fixed at that position.

As shown in FIG. 2, a drive source 34 for transmitting rotation power in conjunction with another printing unit is provided at the upper left of the frame 6, and its output shaft 35 has a sliding shaft. 36 is fitted with a spline, and at the tip of the sliding shaft 36,
The internal gear 37 is fixed. The sliding shaft 36 is connected to an arm 4 fixed to a piston rod 40 of a working cylinder 39.
When driven forward, the internal gear 37 at the leading end meshes concentrically with the external gear 38 fixed to the rear end of the plate cylinder driving shaft 12, and raises the rotating force of the drive source 34 upward. The position is transmitted to the plate cylinder 3.

An apparatus plate 42 is fixed to the leading end of the support cylinder 11 of each plate cylinder drive shaft 12, and a pressing means (work cylinder) 43 is attached to each apparatus plate 42 as shown in FIG.
The rocking plate 4 is swingably supported by
5 is swingably supported by the shaft 61.

As shown in FIGS. 3 to 6, the swing plate 45 has an ink roller 46 that can be pressed against the surface of the plate cylinder 3, and an ink supply at a boundary between the ink roller 46 and the plate cylinder 3. A cascade 50 for supplying ink to part D;
A gear 47 coaxial with the shaft 61, a gear 48 fixed coaxially with the ink roller 46, and these gears 47, 48
Is mounted, and the piston rod 44 of the air cylinder 43 is rotatably connected. The swing plate 45 swings due to the contraction of the piston rod 44, and the ink roller 46 supported by the swing plate 45 is pressed against the plate cylinder 3. Here, in the present invention, pressing the ink roller 46 against the plate cylinder 3 means that the ink roller 46 and the plate cylinder 3 come close to a state where they can be contacted via ink.

A driving means K for rotating the plate cylinder 3 at the printing position P and the ink roller 46 of the unit is provided on the gear 48.
Are provided so as to be connectable. As shown in FIGS. 4 to 6, the driving means K includes a driving arm 51 provided on the frame 6 so as to be swingable about a shaft 51A.
Air cylinder 5 swingably connected to frame 6
2, a gear 53 provided on the drive arm 51, sprockets 53a, 53b, 54a, 54b, 54c,
54d and these sprockets 53a, 53b, 54
a, drive belt 5 wound around 54b, 54c, 54d
And 5. The sprocket 53a is fixed coaxially with the gear 53, and the sprocket 53b is connected to a drive source (not shown). The drive arm 51 includes the piston rod 5
By swinging by the extension of 2A, the gear 53 meshes with the gear 48 of the swing plate 45 to transmit the rotational driving force from the driving source.

As shown in FIGS. 3 to 5, the cascade 50 is in the form of a pipe which is located above the ink roller 46 and extends the entire length in the axial direction thereof.
The ink supply portion (delta portion) D at the boundary between the plate cylinder 3 and the ink roller 46 is provided from the slit 50a which is attached to the tip of the printer and opens at the ink supply portion D at the boundary between the ink roller 46 and the plate cylinder 3. Supply ink from above. The slit 50a is, as shown in FIG.
The ink roller 46 is opened over the entire length in the axial direction. The delta portion D formed above the contact portion between the ink roller 46 and the plate cylinder 3 is provided with stoppers 46A, 46A at both ends thereof for suppressing the outflow of ink. The ink roller 46, the cascade 50, and the stopper 46A constitute an ink supply device.

The cascade 50 is connected to ink supply means N for supplying ink to the cascade 50 at the printing position P and the washing position W so as to be separable when the plate cylinder 3 is replaced. As shown in FIG. 6, the ink supply means N has a cylinder N1 which is an ink supply pipe, and a sealing means N2 which can be attached and detached by moving the cylinder N1 forward and backward. The ink supply means N is connected to a cascade 5 by a pump or the like.
2 kg / cm ² (lower limit pressure) to 3 kg / cm with respect to 0
Ink can be supplied under pressure at about ² (upper limit pressure) and, as shown in FIG. 3, the ink scraped off from the plate cylinder 3 by the doctor 5 can be circulated and supplied to the cascade 50 from an ink receiver 62 described later. It is. Further, the ink supply unit N enables the ink and the cleaning solvent to be switched and supplied to the cascade 50 of the printing position P by a switching unit (not shown), and also supplies the cleaning solvent from the ink receiver 62 at the printing position P. Aspirating and removing, and a cleaning solvent can be supplied under pressure to the cascade 50 of the cleaning position W,
The solvent for cleaning is removed from the ink receiver 62 at the cleaning position W by suction.

As shown in FIGS. 3 and 4, a plurality of ink receivers 62 for receiving ink dropped from the plate cylinder 3, the doctor 5 and the like are stacked below the plate cylinder 3 of the apparatus plate 42. It is provided. This ink receiver 62 is different from an ink pan that stores ink and supplies it to the plate cylinder. The ink receiver 6
Reference numeral 2 denotes a non-metallic material, such as polyethylene, polyolefin (polypropylene), or epoxy resin, which is resistant to an ink solvent (ethyl acetate) and has a shape capable of stacking a plurality of sheets. Discard the sheets.

The gear 48 is provided with a washing driving means 70 for rotatingly driving the plate cylinder 3 at the washing position W and the ink roller 46 of the unit. The cleaning driving means 70
As shown in FIG. 7, a drive arm 71 provided on the frame 6 so as to be swingable about a shaft 71A, an air cylinder 72 swingably connected to the drive arm 71 and the frame 6, Gear 73 provided on drive arm 71
And sprockets 73a, 73b, 74a, 74b, 7
4c, 74d, and these sprockets 73a, 73b,
And a drive belt 75 wound around 74a, 74b, 74c, 74d. The sprocket 73a is fixed coaxially with the gear 73, and the sprocket 73b is connected to an air motor (not shown). The drive arm 71 swings due to the extension of the piston rod 72A, and the gear 73 meshes with the gear 48 of the swing plate 45 at the washing position W to transmit the rotational driving force from the air motor.

Next, a printing procedure according to the present embodiment will be described.

As shown by a chain line in FIG. 2, the slide shaft 36 is connected to the plate cylinder drive shaft 12 at the printing position P and is rotationally driven.
As shown in (2), the ink roller 46 is pressed against the plate cylinder 3 at the printing position by the air cylinder 43, and the drive arm 51 is driven by the air cylinder 52 to mesh with the gear 53 to drive the ink roller 46. At the same time, the cylinder N1 of the ink supply means N shown in FIG. 6 is connected to the sealing means N2, and ink is supplied from the ink supply means N to the cascade 50 at the printing position P. As shown in FIG. Roller 46 and plate cylinder 3
The ink is ejected to the delta portion D formed above the contact portion. In this delta portion D, ink is accumulated by stoppers 46A, 46A on both sides thereof. The ink adheres to the plate cylinder 3 at the printing position P, and the ink remaining on the concave surface without being scraped off by the doctor 5 adheres to the film a which is pressed against the plate cylinder 3 by the impression cylinder 4 and travels to perform printing. Is applied. The ink scraped off by the doctor 5 drops into the ink receiver 62 and is circulated to the ink supply means N.

When one printing operation is completed, the ink supply is switched by a switching means (not shown) of the ink supply means N, and a cleaning solvent (ethyl acetate) is supplied to the cascade 50 at the printing position P. 3 and ink roller 4
6 is pre-washed. By this pre-cleaning, the cylinder N1 and the sealing means N2 of the ink supply means N shown in FIG. 6 and the doctor 5 are cleaned, and the ink adhering to the plate cylinder 3 and the ink roller 46 moves to the cleaning position. Drying in between is prevented. Thereafter, the drive arm 51 is retracted outward by the air cylinder 52 as shown by a chain line in FIG. 4, and the impression cylinder 4 and the doctor 5 are retracted upward to connect the cylinder N1 of the ink supply means N from the sealing means N2. The rotation of the indexing rotation motor 19 causes the indexing rotary plate 10 to rotate 120 ° counterclockwise in FIG. 3, and the plate cylinder 3 at the printing position P to the cleaning position W and to the cleaning position W. The existing plate cylinder 3 moves to the exchange position T, and the new plate cylinder 3 attached at the exchange position T moves to the printing position P.

At this time, the connection of the cylinder N1 is changed from the old cascade 50 to the new cascade 50 at the printing position P and the cleaning position W.

Next, at the printing position P, the swinging plate 45 swings due to the contraction of the piston rod 44, and the ink roller 46 supported by the swinging plate 45 moves the new plate cylinder 3 shown in FIG. And the cascade 50 moves integrally with the ink roller 46. Then, printing is performed with a new plate cylinder 3 ′. During this time, the plate cylinder 3 at the cleaning position W shown in the lower left of FIG. While pressing against the plate cylinder 3 in the position,
The drive arm 71 is driven by the air cylinder 72 shown in FIG. 7 to engage the gear 73 to drive the ink roller 46. Then, a cleaning solvent is supplied to the cascade 50 at the cleaning position W, and the sealing means N2 of the ink supply means N,
While cleaning the inside of the cascade 50 and the vicinity of the slit 50a, the solvent is accumulated in the delta portion D, the plate cylinder 3 and the ink roller 46 are washed, and the ink and the solvent accumulated in the ink receiver 62 are sucked by the ink supply means N. And remove. The supply of the cleaning solvent to the cascade 50 by the ink supply means N at the cleaning position P is in the range of 1 minute to 10 minutes, preferably about 5 minutes.

In the lower right replacement position T in FIG. 3, the swing plate 45 swings due to the extension of the piston rod 44, and the ink roller 46 supported by the swing plate 45 is moved from the plate cylinder 3. At the same time, the plate cylinder drive shafts 12, 12 on both sides are retracted by the driving of the air cylinder 15 to remove the plate cylinder 3, and the new plate cylinder 3 mounted on the carriage b is raised to the mounting position, and the air cylinder 15 is driven. Then, the plate cylinder drive shafts 12 on both sides are advanced, and the tapered portion 13 at the front end is fitted into the tapered hole at the center of the plate cylinder 3, thereby fixing the plate cylinder 3 to be used for the next printing. A polishing step of polishing the cylinder 3 by a polishing means (not shown) to remove burrs on the plate cylinder 3 is performed.

In the meantime, the ink receiver 62 at the exchange position T can be detached so as not to hinder the attachment / detachment of the plate cylinder 3, and when one printing is completed, the uppermost one of the superposed ink receivers 62 is removed. Can be discarded.

When the plate cylinder 3 is replaced, the machine cylinder 4
The swinging plate 45 is tilted by the advance of the piston rod 44 of the third cylinder 3, and the ink roller 46 is separated from the plate cylinder 3.
When the replacement is completed, it returns to the original position.

The sun gear 17, the intermediate gear 16, the planetary gear 18, and the indexing rotary plate 10 constitute a differential gear mechanism, and the gears 16, 17, and 18 have the same number of teeth. Is rotated by the revolving angle in the reverse direction and rotates without changing the posture, and the ink receiver 62 does not tilt.

[0030]

According to the gravure printing machine of the present invention, a cleaning solvent is supplied to the cascade at the cleaning position and the plate cylinder is driven to clean the plate cylinder and the cascade. Above all, the cleaning process can be performed, and the cleaning is performed by driving the ink roller by the cleaning driving means, so that the cleaning capability is further improved, and the work efficiency in the step change can be improved. In addition, since the ink pan is not used, it is possible to improve the working efficiency in cleaning after printing is completed.

[Brief description of the drawings]

FIG. 1 is a side view showing a unit in an embodiment of a gravure printing machine according to the present invention.

FIG. 2 is a front view showing a plate cylinder driving unit in FIG.

FIG. 3 is an enlarged side view of the driving section shown in FIG. 1;

FIG. 4 is a side view of the vicinity of the ink roller of FIG. 3;

FIG. 5 is a side view of the vicinity of the cascade in FIG. 3;

FIG. 6 is a plan view near the cascade in FIG. 3;

FIG. 7 is a side view showing a cleaning driving unit.

[Explanation of symbols]

 N: Ink supply means K: Driving means P: Printing position W: Cleaning position T: Replacement position 3, 3 '... Plate cylinder 4: Impression cylinder 5: Doctor 6: Frame 9: Indexing drive shaft 10: Indexing rotary plate DESCRIPTION OF SYMBOLS 11 ... Support cylinder 12 ... Plate cylinder drive shaft 16 ... Intermediate gear 17 ... Sun gear 18 ... Planetary gear 19 ... Indexing rotation motor 34 ... Drive source 43 ... Pressing means (air cylinder) 45 ... Rocking plate 46 ... Ink roller 46A: stopper 50: cascade 61: shaft 62: ink receiver 70: cleaning driving means

Claims (4)

[Claims] 1. A plurality of units each including a plate cylinder and an ink supply device for supplying ink to the plate cylinder are provided so as to be movable at least at a printing position and a washing position, and a pressure for pressing a film against the plate cylinder is provided. A cylinder, a doctor for scraping excess ink from the surface of the plate cylinder with respect to the unit at the printing position, and an ink supply for switchably supplying ink and a cleaning solvent to the ink supply device. Means, the ink supply device, an ink roller pressed against the surface of the plate cylinder, a cascade for supplying ink and a solvent for cleaning to an ink supply portion at a boundary between the ink roller and the plate cylinder. In the cleaning position, the plate cylinder is driven and a cleaning solvent is supplied to the cascade to perform cleaning between the plate cylinder and the cascade. Labia printing machine. 2. The ink supply device according to claim 1, wherein the ink and the cleaning solvent are switchably supplied to a printing position cascade, and a cleaning solvent is supplied to the cleaning position cascade. The gravure printing press according to 1. 3. The gravure printing press according to claim 2, wherein the supply of the cleaning solvent at the cleaning position is in a range of 1 minute to 10 minutes. 4. The gravure printing press according to claim 1, further comprising a cleaning drive unit configured to rotationally drive the ink roller at the cleaning position.