JP2789576B2 - Conductive jig for plating printing rolls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive jig for plating a printing roll, and more particularly, to a conductive jig for a printing roll for holding a printing roll used for gravure printing during the plating process. It relates to improvement of jigs.

[0002]

2. Description of the Related Art In general, a printing roll used for gravure printing is obtained by degreasing the surface of a roll body made of an aluminum alloy, coating a resist film, baking and developing characters and images, etching, and then etching. The resist film is peeled off, subjected to electrolytic copper plating and electrolytic chromium plating, and used for printing. In particular, when the printing roll is plated, the conductive jig 2 for plating having an integral conductive shaft shown in FIG.
1 is used.

That is, this plating jig 21 is
A conductive shaft 1 for attaching a printing roll 2 to impart a polarity of a cathode is provided. To fix the printing roll 2 to the conductive shaft 1, first, a taper provided at both ends of the printing roll 2 is provided. Copper bosses 5a and 5b are fitted into the holes 4, and the conductive shaft 1 is inserted into the boss holes 14 of these bosses 5a and 5b.

[0004] Next, packing 6 is attached to both ends of the printing roll 2.
The shielding plates 7a and 7b made of, for example, vinyl chloride are passed through the conductive shaft 1 so as to face each other, and one of the shielding plates 7b is fixed on the conductive shaft 1 with screws 22 and the other shielding plate 7a is In order to press the inserted spring 23 toward the one shielding plate 7b, a spring pressing metal fitting 26 is attached via a vinyl chloride cylinder 24. In this case, a packing 27 is interposed between the vinyl chloride cylinder 24 and the shielding plate 7a, and a spring press fitting 26 is located outside the electrolytic cell 25 and is fixed to the conductive shaft 1 by a press screw 28. 29 regulates the conductive shaft 1 in the axial direction. In the drawing, reference numeral 30 denotes a copper foil, which is attached so that the conductive shaft 1 and the boss holes 14 of the bosses 5a and 5b are in close contact with each other. The printing roll 2 is moved to the anode 18 in the electrolytic tank 25 by the plating conductive jig 21 thus assembled.
The plating process is performed while the printing roll 2 is being rotated.

[0005]

However, in the above-described conductive jig for plating a printing roll, the conductive shaft 1 is a long rod (about 2 m), so that not only is it heavy but poor in workability, The contact surface between the boss hole 14 and the conductive shaft 1 is liable to be worn due to repeated attachment and detachment of the bosses 5a and 5b, causing poor contact and causing a fluctuation in the current value. There was a problem that had to be inserted in between. Further, even when the copper foil 30 was attached, the applied current value was limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can improve the assembling workability, does not cause a problem of poor contact, and therefore does not require insertion of a copper foil, and is capable of flowing a high current. It is an object of the present invention to provide a conductive jig for plating.

[0007]

In order to achieve the above object, a conductive jig for plating a printing roll according to the present invention is provided with a tapered hole whose diameter is increased outward at both ends of the printing roll.
In a conductive jig for plating of a printing roll having a conductive boss inserted into the tapered hole and a boss engaging with the tapered hole and shielding plates facing both ends of the printing roll, the conductive shaft is connected to the printing roll part. Is divided into a central shaft and first and second end shafts at both ends thereof. The first end shaft and the central shaft are connected to one shield plate via a shaft coupling, and the first shaft is connected to the central shaft. The first boss is mounted, the second boss is screwed onto the shaft end of the boss, the printing roll is sandwiched, and the other shielding plate is attached to the second boss via the second end shaft. It is characterized by.

In the present invention, the shielding plate may be a mere disk made of a synthetic resin. However, the shielding plate suppresses a current concentrated on the edge of the printing roll and forms a uniform coating on the end face. Preferably has a stepped portion facing away from the peripheral edge of the printing roll. Further, the shielding plate may be formed of a metal auxiliary cathode having a window hole formed in a portion facing the peripheral edge portion of the printing roll and having an insulating coating on the entire surface excluding the peripheral end surface. Good.

[0009]

According to the conductive jig for plating a printing roll of the present invention constructed as described above, the conductive shaft is divided into three parts, a central shaft and end shafts on both sides, so that it is light and easy to handle. Yes, workability can be improved. In addition, one end shaft and the center shaft are connected to one shield plate via a shaft joint, and one boss is attached to the center shaft, and the other boss is screwed to the shaft end to form a printing roll. As it is clamped, the sliding distance at the time of attachment and detachment is short for one boss mounted on the central shaft and it is difficult to wear, and the other boss part is screwed to the shaft end of the central shaft. Therefore, no contact failure occurs. Therefore, since a current value does not fluctuate, a high current can be supplied, and a plating process with a high current density can be performed, thereby shortening the processing time and improving the productivity.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a conductive jig for plating a printing roll.
In the figure, reference numeral 1 denotes a conductive shaft made of brass for mounting the printing roll 2, and the conductive shaft 1 has a central shaft 1a located at the printing roll 2 and first and second end shafts 1b and 1c at both ends thereof.
And is divided into: Flanges 3 that cover the openings are integrally provided at both ends of the printing roll 2, and tapered holes 4 whose diameters are increased outward are formed at the axial centers of the respective flanges 3. First and second bosses 5a and 5b made of copper are respectively engaged with the tapered holes 4 at the axial center portions of both ends of the printing roll 2. Outside these bosses 5a and 5b, ring-shaped portions are formed at both ends of the printing roll. The shield plates 7a and 7b opposed to each other with the rubber packing 6 interposed therebetween are arranged.

A central shaft 1a and one (first) end shaft 1b are connected to the one shielding plate 7a via a shaft coupling 8 made of stainless steel, and one (first) is connected to the central shaft 1a. 1
The boss 5a is mounted, and the other (second) boss 5b is screwed to the shaft end of the boss 5a, and the print roll 2 is held therebetween.

In this case, the shielding plates 7a and 7b are made of synthetic resin,
Preferably, it may be formed in a disc shape having a diameter larger than the outer diameter of the printing roll 2 by vinyl chloride (not shown), and as shown in FIG. A step portion 9 may be formed in the portion away from the peripheral edge of the end portion of the print roll 2. Shaft coupling 8
Is mounted on the outer surface axial portion of one of the shielding plates 7a with a countersunk screw 10. Both ends of the central shaft 1a and each end shaft 1b, 1c
Threaded portions 11a to 11d are engraved at one end of the shaft joint 8, respectively. The screw holes 11a and 11c of the central shaft 1a and the end shaft 1b are screwed into the shaft joint 8 in such a manner as to face each other on the same axis. 12a and 12b are formed. Although the screw holes 12a and 12b of the shaft coupling 8 are independent from each other in the illustrated example, they may be connected to each other, and the shaft coupling 8 may be a nut. Also, the shielding plate 7a has a screw portion 11a of the central shaft 1a.
Is formed, but the screw hole 12c may be a simple shaft hole. Furthermore, the shaft coupling 8
The screw portion 11c of the first end shaft 1b screwed to the other (second) end shaft 1 is not loosened by rotation during plating.
The threaded portion 11d of c may be a reverse thread, or may be a spline, a square shaft, or the like.

A pressing nut 13 for pressing the boss 5a from the side of the shielding plate 7a is screwed to the screw portion 11a of the central shaft 1a, but the pressing nut 13 may be a simple ring. The thickness of the presser nut 13 is as follows.
The compression thickness of the packing 6 provided between the shield plate 7a and the flange 3 of the printing roll 2 is set.

The one (first) boss 5a is formed with a boss hole 14 into which the center shaft 1a is slidably inserted, and the other (second) boss 5b is formed with the center shaft 1a and the second shaft. Are formed with screw holes 12d and 12e in which the screw portions 11b and 11d of the end shaft 1c are screwed to face each other on the same axis. In addition,
The screw holes 12d and 12e are independent of each other in the illustrated example, but may be connected. A handle hole 15 is formed in the outer surface of the second boss 5b so that a handle for rotating the second boss 5b is engaged (see FIG. 2).

A shaft hole 16 through which the end shaft 1c is inserted is formed in the other shield plate 7b, and the screw portion 11 of the end shaft 1c is formed.
A pressing nut 17 for pressing the shielding plate 7b toward the printing roll 2 is screwed to d. In FIG. 1, reference numeral 18 denotes an anode provided in the electrolytic cell.

Next, a method for assembling the conductive jig for plating the print roll 2 configured as described above will be described.
The packing 6 is attached to the inner surfaces of both shielding plates 7a and 7b in advance. First, the center shaft 1a to which the holding nut 13 is attached is screwed into the shaft coupling 8 attached to one of the shielding plates 7a with the countersunk screw 10 to be integrated. Next, a first boss 5a having a boss hole 14 is passed through the center shaft 1a, and further, a printing roll 2 is passed. Then, a second boss 5b having a handle hole 15 is attached to the shaft end of the center shaft 1a. Is engaged with the handle hole 15 and tightened. In this case, in order to prevent the second boss 5b having the handle hole 15 from being worn by sliding contact with the tapered hole 4 of the printing roll 2, tightening by the handle is stopped at an appropriate position, and the shaft joint 8 is turned. 1a is preferably screwed into the boss 5b until the packing 6 is compressed to the thickness of the holding nut 13. As a result, the printing roll 2 is pressed and nipped by the two bosses 5a and 5b fitted into the tapered holes 4 at both ends. Next, a presser nut 17 is attached to the second end shaft 1c, and the second end shaft 1c is screwed into a second boss 5b having a handle through the other shielding plate 7b. The shielding plate 7b is
Until it is compressed. Thereafter, the first end shaft 1b
Is attached to the shaft coupling 8 to complete the assembly. In addition,
If the center shaft 1a having the shielding plate 7a and the holding nut 13 attached to the shaft coupling 8 and the first end shaft 1b are assembled in advance, the attachment and detachment of the printing roll 2 can be performed in a short time.

According to the conductive jig for plating of the printing roll 2 configured as described above, the conductive shaft 1 is divided into three parts: the central shaft 1a and the first and second end shafts 1b and 1c on both sides. Therefore, it is light and easy to handle, and workability can be improved. Also, one end shaft 1b and the central shaft 1a are connected to one shielding plate 7a via a shaft coupling 8, and one boss 5a is mounted on the central shaft 1a and the other boss 5a is attached to the shaft end.
b is screwed together to hold the print roll 2,
One boss 5a attached to the central shaft 1a has a short sliding distance at the time of attachment and detachment and is hardly worn or damaged, and the other boss 5b is screwed to the shaft end of the central shaft 1a. No contact failure occurs. Therefore, since the current value does not fluctuate, a high current can be passed, and a plating process with a high current density can be performed, thereby shortening the processing time and improving the productivity. Further, when the shielding plates 7a and 7b are formed of synthetic resin and have a stepped portion 9 which is opposed to and separates from the peripheral edge of the printing roll 2, the shielding edge 7a, 7b may be provided at the edge 2a of the printing roll 2. The concentrated current is suppressed, and the edge portion 2a
Overplating can be prevented, and a uniform film can be formed.

The details of the shield plates 7a and 7b of the above embodiment are as follows: a metal plate having a window hole 19 formed in a portion facing the peripheral edge of the end portion of the print roll 2 as shown in FIGS. Preferably, the auxiliary cathode 20 may be made of stainless steel. In this case, the auxiliary cathode 20 is formed in a disk shape having a diameter substantially equal to the outer diameter of the end of the printing roll 2, and a plurality of window holes are left except for the peripheral edge corresponding to the edge 2 a of the printing roll 2. 19 are formed, and the peripheral end surface 20 is formed.
Masking 20b (insulating coating) with insulating paint is applied to both side surfaces where a is left and the entire inner peripheral surface of the window hole 19. Also,
The auxiliary cathode 20 is integrally provided with a shaft joint 8 for attaching the center shaft 1a and the end shaft 1b. According to the auxiliary cathode 20 having such a configuration, the end edge portion 2 of the printing roll 2 is provided.
The current concentrated on the edge a of the auxiliary roll 20 flows to the peripheral end surface 20a of the auxiliary cathode 20, and the current is supplied to the end surface of the printing roll 2 through the window hole 19, so that excessive plating of the edge portion 2a can be prevented, and a uniform film is formed on the end surface. be able to.

Next, a description will be given of a film formation test using the plating conductive jig of the present invention and a conventional plating conductive jig. In the above film formation test, a jig (FIG. 1) (Example 1) using a stainless steel auxiliary cathode 20 (FIG. 3) having a window hole 19 as shielding plates 7a and 7b, and a stainless steel auxiliary A jig in which the cathode 20 is replaced with synthetic resin shielding plates 7a and 7b having a stepped portion 9 (FIG. 5) (Example 2), and a jig in which the conductive shaft shown in FIG. (Comparative Example) was prepared and a film formation test was performed under the following conditions.

Test conditions: The electrolytic solution was copper sulfate 200 g / l.
(Liter), sulfuric acid 70 g / l, and hydrochloric acid 0.05 g / l. A bath composition of Nippon Kagaku Sangyo Co., Ltd. (trade name) is used to densify the plating layer on the surface and to give it a glitter. 2cc / l and RH2
00 (trade name) was added at 3 cc / l, and the bath temperature was set to 40 ° C. The printing roll 2 has a diameter of 200 mm and a length of 500 mm.
mm and completely immersed in the electrolyte to obtain a size of 400
The distance between the anode 18 made of a copper plate of × 500 mm and the anode 18 is 50 m.
m, and a cooling device was provided in the electrolytic cell.

When a test was conducted under the above conditions, Example 1 was obtained.
And 2, current densities of 20 A / dm ² and 25 A / dm ²
As a result of processing for 20 minutes and 16 minutes, respectively, a copper plating film of 110 μm was formed on the print roll plane portion, and the print roll edge portion 2a was 135 μm in Example 1 and 200 μm in Example 2, 1.2, 1.
It could be suppressed to about 8 times and the current value was stable.
On the other hand, in the comparative example, a test was performed by attaching the copper foil 30 to the gap between the conductive shaft 1 and the boss hole 14 of the boss 5a.
At current densities of 20 A / dm ² and 25 A / dm ² , the fluctuation of the current value was large, and the test was stopped 2 to 3 minutes after the test was started. In addition, the fluctuation of the current value is small, and 110
The maximum current density at which a copper plating film of μm could be formed was 10
At A / dm ² , the required time was 40 minutes.

[0023]

As described above, according to the present invention, the following effects can be obtained because of the configuration described above.

1) According to the conductive jig for plating a printing roll according to the first aspect, the conductive shaft is divided into three parts, a central shaft and both end shafts, so that it is light and easy to handle, and is easy to assemble. Workability can be improved.

One end shaft and the center shaft are connected to one shield plate via a shaft coupling, one boss is mounted on the center shaft, and the other boss is screwed onto the shaft end of the printing roll. So that the one boss attached to the central shaft has a short sliding distance when attaching and detaching, making it difficult to wear.
Since the other boss portion is screwed to the shaft end of the central shaft, no contact failure occurs, and therefore, the current value does not fluctuate. The plating process can be performed at a high density, thereby shortening the processing time and improving the productivity.

According to the second aspect of the present invention, the shielding plate is formed of a synthetic resin and has a stepped portion facing the peripheral edge of the end of the printing roll. Therefore, current concentrated on the edge of the end portion of the printing roll is suppressed, and excessive plating at the edge portion can be prevented.

According to the third aspect of the present invention, the shielding plate has a window hole formed in a portion facing the peripheral edge of the printing roll and leaves the peripheral end surface. Since the entire surface is composed of a metal auxiliary cathode coated with insulation, the current concentrated on the edge of the end of the print roll flows to the auxiliary cathode and current is supplied to the end of the print roll through the window hole, and the edge Can prevent excessive plating of parts,
A uniform film can be formed on the end face.

[Brief description of the drawings]

FIG. 1 is a sectional view of a conductive jig for plating a print roll according to an embodiment of the present invention.

FIG. 2 is a front view of a boss screwed to a shaft end of a center shaft in the present invention.

FIG. 3 is a perspective view of an auxiliary cathode configured as a shielding plate.

FIG. 4 is a cross-sectional view showing a mounting state of the auxiliary cathode.

FIG. 5 is a sectional view of another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional conductive jig for plating a printing roll in which a conductive shaft is formed of a single long rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive shaft 1a Central shaft 1b, 1c End shaft 2 Printing roll 4 Tapered hole 5a, 5b Boss 7a, 7b Shielding plate 8 Shaft coupling 9 Stepped portion 19 Window hole 20 Auxiliary cathode 20a Peripheral end surface 20b Insulation coating portion

Claims (3)

(57) [Claims] 1. A boss that engages with a tapered hole in a conductive shaft inserted into the tapered hole, and a shield that opposes both ends of the print roll. In a conductive jig for plating a printing roll having a plate mounted thereon, the conductive shaft is divided into a central shaft located at the printing roll portion and first and second end shafts at both ends thereof, and a first end is formed. The part shaft and the center shaft are connected to one of the shielding plates via a shaft coupling, and a first boss is mounted on the center shaft, and a second boss is screwed onto the shaft end to hold the printing roll, A conductive jig for plating a printing roll, wherein the other shielding plate is attached to the second boss via a second end shaft. 2. The plating for a printing roll according to claim 1, wherein the shielding plate is formed of a synthetic resin and has a stepped portion facing away from an edge of the printing roll. Conductive jig. 3. The shielding plate is formed of a metal auxiliary cathode having a window hole formed in a portion facing the peripheral edge portion of the printing roll and having an insulating coating on the entire surface excluding the peripheral end surface. The conductive jig for plating a print roll according to claim 1, wherein: