JPH0435342B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is a method for adjusting the relative positions of plates of several colors with respect to the plate cylinder, which is necessary for color printing, etc. in a printing press having a cylindrical plate cylinder. This relates to a device for

(Prior art) When using a printing machine with such a cylindrical plate cylinder, plate matching involves making a test print of the first plate on paper, checking the result, and then moving the plate on the plate cylinder. This determines the printing position of the drawing line on the paper. For the second and subsequent editions, the same process as for the first edition was carried out, and the printing position was matched to that of the first edition.

(Problems to be Solved by the Invention) In order to perform plate alignment in this manner, it is necessary to perform a test printing, which results in poor printing efficiency and high costs in the case of small quantity printing.

In addition, in the type in which the printing machine is stopped to move the plate, the condition of the printing plate changes greatly and there is a disadvantage that there is more wear and tear.

(Means for Solving the Problems) Therefore, the present invention aims to facilitate accurate plate alignment, eliminate the need for paperback, and improve printing efficiency. The gist is the structure.

That is, a support is provided on the plate cylinder so that printing is possible while the plate tensioning fitting having the position adjustment means, to which the plate is attached, is detachably fixed.

On the other hand, the surface plate is provided with a fixing device that can detachably fix the plate tensioning fitting to which the plate removed from the plate cylinder remains attached, and whose position can be adjusted freely by the position adjusting means. Furthermore, two reticle-equipped loubaixes having position adjustment means are provided to align with two positioning indicators such as cross marks on the plate attached to the surface plate.

(Function) The plate tensioning fitting with the first plate attached is attached to the support provided on the plate cylinder, and after adjusting and fixing the printing position on the paper on the plate cylinder with the position adjustment means, printing is performed. I do. After printing the first plate, the plate tensioning fitting with the plate removed from the plate cylinder still attached is fixed to the surface plate using a fixture.

The position adjusting means aligns the reticle of the two positionally adjustable loupes with the two indicators on the plate, respectively, and fixes the loupes. That is, at this time, the position of the reticle of the magnifying glass matches the index of the first edition.

Next, remove the first edition from the plate tensioning fittings,
Attach the second version and secure it to the fixture. The position is adjusted by the position adjustment means of the plate tensioning fitting so that the indicators on the plate correspond to the reticle of the fixed magnifying glass. After position adjustment, if the plate tensioning fitting to which the second plate is attached is fixed as it is to the support of the plate cylinder, the printing of the second plate matches the printing position of the first plate from the first sheet.

The third and subsequent versions can be aligned and printed in the same manner as the second version.

(Effects) The plate, which has been aligned while attached to the plate tensioning fitting, can be attached to the plate cylinder and printed, so there is no need to run through it as in the past, and printing efficiency is improved.

(Example) Below, an example will be described based on the drawings.
is a cylinder type plate cylinder, and the relief part has a U-shaped groove 3.
A position adjustment side support 2 having a shaft 5 and a tension adjustment side support 4 having a shaft 5 are erected facing each other.

Reference numeral 6 denotes a position adjustment side plate fitting, and two protruding bolts 7 pass through a shaft 8 that is detachably fitted into the U-shaped groove 3. 9 is a small diameter bolt with a head screwed onto one end of the shaft 8. Reference numeral 10 designates a set of position adjustment nuts, which are screwed onto the bolt 7 with the shaft 8 interposed therebetween.

11 is a tension adjustment side plate tensioning fitting, which is protruded from 2.
The main bolt 12 passes through the shaft 5 of the tension side support, and a tension adjustment nut 13 is screwed thereon.

The plate 14 is detachably attached to both plate tensioning fittings 6 and 11, and the position adjustment nut 10 of the position adjustment side plate tensioning fitting 6 allows the position of the plate 14 relative to the plate cylinder 1 to be adjusted by adjusting the tension adjustment side plate tensioning fitting 11. The tension can be adjusted by a tension adjustment nut 13.

15 is a surface plate, and the shaft 8 of the position adjustment side plate tensioning fitting 6
A pair of left and right front fixing devices 16 are fixedly attached thereto, each having a U-shaped groove with an open upper portion for detachably fixing.

Furthermore, a pair of left and right rear fixtures 17 are fixed to the rear side of the surface plate 15, each having a shaft 18 with a hole into which the bolt 12 of the tension adjustment side plate tensioning fitting 11 is loosely fitted. Further, a stopper 19 is fixed to the right side of the right front fixture 17.

Therefore, by fitting the shaft 8 of the position adjustment side plate tensioning fitting 6 into the U-shaped groove of the front fixture 16 and adjusting the bolt 9 by contacting the stopper 19, the position adjustment plate tensioning fitting can be adjusted in the left-right direction. positioning is possible. Further, by moving the position adjustment nut 10 back and forth, the position of the plate 14 in the front and back direction can be adjusted. Further, the tension can be adjusted by loosely fitting the bolt 12 of the tension adjustment side plate fitting 11 into the shaft 18 of the rear fixture 17 and moving the tension adjustment nut 13 back and forth.

Reference numeral 20 denotes rail legs, which are erected at both left and right ends of the front portion of the surface plate 15, and support the horizontal rails 21. Reference numeral 22 denotes a vertical rail, which is movable in the left and right directions using mounting fittings 23, and can be fixed at any position using a set screw 24.

Reference numeral 25 denotes a pair of loupes, each having a cross-shaped reticle. The vertical rails 22 are movable in the front and back directions using loupe mounting fittings 26, and can be fixed at any desired position using setscrews 27.

Note that if you draw the position of the paper on the surface plate, just by aligning the first version with this position, you can also align the printing position on the paper of the first version on the surface plate.
It is convenient because there is no need to thread through the sheets.

[Brief explanation of drawings]

FIG. 1 is a side view of the plate cylinder, and FIG. 2 is a plan view of the plate tensioning fitting with the plate attached placed on the surface plate. DESCRIPTION OF SYMBOLS 1... Plate cylinder, 2... Position adjustment side support, 4... Tension adjustment side support, 6... Position adjustment side plate tension fitting, 10...
Position adjustment nut, 11...Tension adjustment side plate tension fitting,
13...Tension adjustment nut, 14...plate, 15...surface plate,
21...horizontal rail, 22...vertical rail, 25...loupe.

Claims (1)

[Claims] 1. On the cylinder plate, a support that can be used to print while removably fixing the plate tensioning fittings with position adjustment means to which the plate is attached is erected, and on the surface plate, the plate that has been removed from the plate cylinder is placed. A fixing device is provided that can detachably fix the plate tensioning metal fittings with the plate attached, and the position can be adjusted freely by the position adjustment means, and also a fixing device for aligning two pieces such as cross marks on the plate attached to the surface plate. A plate alignment device for a printing press having a cylindrical plate cylinder provided with two magnifying glasses with reticle having position adjustment means for alignment with an index.