JPH11291459A - Gravure printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent irregularities at the time of printing from being generated and cut a required ink amount during printing and an ink amount to be discarded and thereby increasing the cleaning operation efficiency in setups and changeovers. SOLUTION: In a multiarm turret-type gravure printing machine equipped with a plurality of printing cylinders 3 in a freely rotatable manner, a printing unit is provided which comprises an ink roller 46 which can come into contact with the surfaces of the printing cylinders 3, an ink feed device which has a cascade for feeding ink near a spot where the ink roller 46 comes into contact with the printing cylinder 3, an ink feed means N which feeds the ink to the cascade in such a manner that the ink feed means N is separable from the printing cylinder 3 during rotating of the latter and a drive means which drives the ink roller 46.

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 roller of a type that oozes ink from pores on the surface is described, and an ink supply method of a type in which a plate cylinder is dipped using an ink pan is also described. Have been. In this case, in order to facilitate cleaning of the ink pan, a means such as attaching a film to the inside of the ink pan or processing the inside of the ink pan with Teflon has been adopted.

[0005]

However, the ink roller disclosed in the above publication has problems such as uneven printing and has been difficult to use. Furthermore, in the printing unit of the gravure printing machine disclosed in the above publication, there has been a demand for further reducing the procedure required for exchanging the plate cylinder and ink. In addition, especially when changing ink, it is necessary to wash the ink pan that supplies ink to the plate cylinder,
Weight of steel or stainless steel ink pan is 8kg
However, there is a problem that a great burden is imposed on a worker who performs replacement and cleaning. In addition, the ink remaining in the ink pan often cannot be reused immediately, and if this residual ink is mixed for reuse, the color of the ink becomes dirty, and this ink must be discarded. There is a problem, and when printing a large number of prints having a short print length, there is a problem that the amount of discarded ink may increase. Furthermore, when a film is stuck inside the ink pan or when the inside of the ink pan is processed with Teflon, there is a problem that the cost is increased accordingly.

The present invention has been made in view of the above circumstances, and aims to achieve the following objects. To prevent unevenness during printing. To reduce the amount of ink required for printing. Reducing the amount of ink to be discarded. Improve the work efficiency of cleaning in step change and reduce costs.

[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 with respect to each other. The ink supply device includes a doctor for scraping excess ink from the surface of the plate cylinder, an impression cylinder for pressing a film against the plate cylinder, and ink supply means for supplying ink to the ink supply device. However, the above problem has been solved by providing an ink roller pressed against the surface of the plate cylinder, and a cascade for supplying ink to an ink supply portion at a boundary between the ink roller and the plate cylinder. In the present invention, a technique is employed in which the ink is supplied under pressure by the ink supply means to the cascade, and furthermore, the ink supply portion at the boundary between the plate cylinder and the ink roller has an ink flow at both ends thereof. A technique in which a stopper is provided is used. Further, the present invention provides the cascade,
The ink supply means can circulate and supply ink from the ink receiver. Further, according to the present invention, an ink receiver for receiving ink is provided below the plate cylinder, and the ink receiver can be discarded when the plate cylinder is replaced. It is also possible to use a non-metallic material having a resistance to a solvent such as that described above, and a shape in which a plurality of sheets can be stacked.

[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 in FIG. 3, a washing position indicated by a reference character W, and an exchange position indicated by a reference character T. Of these, the printing position (upper position) P The plate cylinder 3 performs printing by pressing the film a by the impression cylinder 4 of the film running and drying unit 2, and a doctor 5 for scraping off excess ink from the plate cylinder 3 is provided on the plate cylinder 3 at the printing position P. Provided.

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 machining cylinder 43 is oscillated by a shaft 60 on each apparatus plate 42, as shown in FIG. While being supported, the swing plate 45 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.

The gear 48 is provided with connectable drive means K for rotatingly driving the plate cylinder 3 at the printing position and the ink roller 46 of the unit. The drive means K is, as shown in FIGS. 4 to 6, a drive arm 51 provided on the frame 6 so as to be swingable about a shaft 51A, and is connected to the drive arm 51 and the frame 6 so as to be swingable. Air cylinder 52
A gear 53 provided on the drive arm 51; and sprockets 53a, 53b, 54a, 54b, 54c, 5
4d and these sprockets 53a, 53b, 54a,
And a drive belt 55 wound around 54b, 54c, 54d. 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 a piston rod 52A.
Swings by the extension of the
3 transmits the rotational driving force from the meshing drive source.

As shown in FIGS. 3 to 5, the cascade 50 is formed in a pipe shape which is located above the ink roller 46 and extends over the entire length in the axial direction. The ink is supplied from above the ink supply portion (delta portion) D at the boundary between the plate cylinder 3 and the ink roller 46 from the slit 50a opened to the ink supply portion D side at the boundary. The slit 50a is shown in FIG.
As shown in (b), 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 an ink supply means N for supplying ink and a cleaning solvent to the cascade 50 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 pressurizes and supplies the ink to the cascade 50 at a pressure of about ² kg / cm ² (lower limit pressure) to 3 kg / cm ² (upper limit pressure) by a pump or the like, as shown in FIG. Then, the ink scraped off from the plate cylinder 3 by the doctor 5 is transferred from an ink receiver 62 described later to a cascade 5.
It can be circulated to zero. Further, the ink supply means N
Can switch and supply the ink and the cleaning solvent to the cascade 50 at the printing position P by switching means (not shown), and suction-remove the cleaning solvent from the ink receiver 62 at the printing position P. Cascade 50 of washing position W
Then, the cleaning solvent can be supplied under pressure, and the cleaning solvent is suctioned and removed from the ink receiver 62 at the cleaning position W.

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.

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

As shown by a chain line in FIG. 2, the sliding shaft 36 is connected to the plate cylinder driving shaft 12 at the printing position P and is driven to rotate.
As shown in FIG. 6, the ink cylinder 46 is pressed against the plate cylinder 3 at the printing position P by the air cylinder 43,
The drive arm 51 is driven by the air cylinder 52 to engage the gear 53 to drive the ink roller 46. At the same time, ink is supplied to the cascade 50 at the printing position P from the ink supply means N in which the cylinder N1 is connected to the sealing means N2, and the cascade 50 contacts the ink roller 46 and the plate cylinder 3 as shown in FIG. Ink is ejected to the delta portion D formed on the upper side. In this delta portion D, ink is accumulated by stoppers 46A, 46A on both sides thereof. This ink adheres to the plate cylinder 3 at the printing position P, and the ink left on the concave surface without being scraped off by the doctor 5 is
Printing is performed by adhering to a film a which is pressed against the plate cylinder 3 by the impression cylinder 4 and travels. The ink scraped off by the doctor 5 drops into the ink receiver 62 and is circulated to the ink supply means N.

In the meantime, the plate cylinder 3 at the washing position W shown at the lower left of FIG. 3 and the ink roller 46 that comes into contact with the plate cylinder 3 are rotated at a low speed by the drive of a motor (not shown). The ink is supplied to clean the inside of the cascade 50 and the vicinity of the slit 50a, store the solvent in the delta portion D, wash the plate cylinder 3 and the ink roller 46, and remove the ink and the solvent stored in the ink receiver 62 (not shown). Discharge by pipe.

At the lower right replacement position T in FIG. 3, the plate cylinder drive shafts 12, 12 on both sides are retracted by the driving of the air cylinder 15, the plate cylinder 3 is removed, and the new plate placed on the carriage b. The cylinder 3 is lifted to the mounting position, and the plate cylinder drive shafts 12, 12 on both sides are advanced by driving the air-air cylinder 15, and the tapered portion 13 at the leading end is fitted in the center tapered hole of the plate cylinder 3 for the next printing. Fix the plate cylinder 3 to be used,
Further, a polishing step of polishing the new plate 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 is detachable so as not to hinder the attachment and 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.

When one printing is completed, the air cylinder 5
2, the drive arm 51 is retracted to the outside and the impression cylinder 4 and the doctor 5 are retracted upward as shown by the chain line in FIG. 3, the plate cylinder 3 at the printing position P is mounted at the cleaning position W, the plate cylinder 3 at the cleaning position W is mounted at the replacement position T, The plate cylinder 3 moves to the printing position P.

At this time, at the printing position P, the cylinder N
1 is reconnected from the old cascade 50 to the new cascade 50.

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.

[0029]

According to the gravure printing press of the present invention, the following effects can be obtained. (1) The cascade ejects ink to the ink supply portion at the boundary between the plate cylinder and the ink roll to supply a sufficient amount of ink to the plate cylinder, thereby preventing the occurrence of unevenness during printing. (2) Since the cascade supplies ink to the ink supply portion at the boundary between the plate cylinder and the ink roll, it is not necessary to use an ink pan for storing ink, and the amount of ink required for printing can be reduced. (3) Since the ink is circulated from the ink receiver to the cascade by the ink supply means, the amount of ink to be discarded can be reduced. (4) Since the ink receiver can be discarded, there is no need to clean the ink receiver. Further, since there is no need to process the inner surface of the ink receiver, the work efficiency of cleaning at the stage change is improved, and the cost is reduced. Can be planned.

[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;

[Explanation of symbols]

 N ... Ink supply means K ... Drive means P ... Printing position W ... Washing position T ... Replacement position 3 ... Plate cylinder 4 ... Impression cylinder 5 ... Doctor 6 ... Frame 9 ... Index drive shaft 10 ... Index rotating plate 11 ... Support Cylinder 12 ... Plate cylinder drive shaft 16 ... Intermediate gear 17 ... Sun gear 18 ... Planetary gear 19 ... Indexing motor 34 ... Driving source 46 ... Ink roller 46A ... Stopper 50 ... Cascade 62 ... Ink receiver

Claims (6)

[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 with respect to each other, and a surface of the plate cylinder with respect to a unit at a printing position. A doctor for scraping excess ink from the printing press, an impression cylinder for pressing a film against the plate cylinder, and ink supply means for supplying ink to the ink supply device, wherein the ink supply device presses against the plate cylinder surface. A gravure printing machine, comprising: a printing unit comprising: an ink roller to be used; and a cascade for supplying ink to an ink supply portion at a boundary between the ink roller and the plate cylinder. 2. The ink supply device according to claim 1, wherein the ink is supplied to the cascade by the ink supply unit under pressure.
A gravure printing machine as described. 3. The gravure printing machine according to claim 1, wherein stoppers are provided at both ends of the ink supply portion at the boundary between the plate cylinder and the ink roller to suppress the outflow of ink. 4. The printing apparatus according to claim 1, wherein an ink receiver for receiving ink is provided below the plate cylinder, and the ink receiver can be discarded when the plate cylinder is replaced. Or a gravure printing machine as described. 5. The gravure printing press according to claim 1, wherein the cascade can circulate and supply ink from the ink receiver by the ink supply unit. 6. The gravure printing machine according to claim 4, wherein the ink receiver is made of a nonmetal having resistance to a solvent such as an ink solvent and has a shape capable of superimposing a plurality of sheets.