JPS6034849A - Sticking method of printing seal on film base - Google Patents

Abstract

PURPOSE:To prevent the occurrence of color shear, by making it easy to index a position at which a printing seal is stuck on an endless belt of a film base of a belt-type multicolor printer, and by sticking the printing seal on the film base employed subsequently, on the basis of a print position employed previously as reference. CONSTITUTION:Rolled paper 50 is set on a plate cylinder 22 and a regulation cylinder 34 of a first belt-stretching mechanism 22 so as to form an endless paper belt. Then, a position at which a printing seal for a first color is set is indexed on the rolled paper 50 by a plotter 26. Meanwhile, a film base 48 for printing the first color is set round endlessly on a second belt-stretching mechanism 24. Then, by rotating the first belt- stretching mechanism 22, the indexed position for printing the first color, which is plotted on the rolled paper 50, is made to come to a position to which a projection is made through a half mirror 28. By this operation, the indexed position is transmitted through the mirror, and then is refracted and projected onto the film base 48. Since said indexed position serves as a reference position for sticking the seal for the first color, an operator sticks the seal 52 to this position and prints the first color on the rolled paper 50. Next, a second color pattern is printed on the basis of the print pattern of the first color.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a printing plate to a film base, and in particular to a method for attaching a printing plate to an endless belt of a film base used in a belt-type multicolor printing device. In addition to making it possible to easily index the printing plate, the printing plate can be attached to the film base used in the subsequent printing unit based on the printing plate attachment position on the film base used in the preceding printing unit. The present invention relates to a proposal in which it is possible to avoid color misregistration that tends to occur during multicolor printing by doing so.

As shown in FIG. 1, there is a belt-type printing press in which the printing length can be arbitrarily changed without being limited by the total circumferential dimension of the plate cylinder. In this printing machine, an endless belt 14 made of a flexible resin film is wound between a plate cylinder 1° and an adjustment cylinder 12 arranged to adjust the center distance with respect to the plate cylinder 10. Printing on the continuous sheet 2o is performed by the pressure action of the printing plate 16 attached to the endless belt 14 and the impression cylinder 18.

In the belt-type printing press, a printing plate is pasted onto a flexible film base to form a printing plate, but the printing plate must be accurately pasted onto a predetermined position on the film base. For this reason, conventionally, when attaching a printing plate to a film base, one person manually marks out the positions and adheres the printing plates one by one to the marked positions. However, this process relies on years of experience and intuition, and requires a long time for positioning, making it extremely inefficient and becoming a bottleneck that impedes efficiency during the printing preparation stage. Also, when performing multicolor printing, the first color and the second color, the second color and the third color...
・In order to prevent color misregistration, the printing plate mounting position in the following printing unit should be determined based on the printing plate mounting position in the preceding printing unit, but in the past, there was no correlation between them. The reality is that they are attached individually without any color, so there is a problem that color misregistration is likely to occur when printing in multiple colors.

The present invention aims to mechanize the process of attaching a printing plate to a film base, which previously relied on the operator's experience, thereby shortening the time required in the preparation stage before printing and improving work efficiency. This was proposed as a purpose.

In order to achieve the above object, the method of applying a printing plate to a film base according to the present invention is to attach a wrapping paper to a first belt winding mechanism consisting of a printing cylinder and an adjustment cylinder, and to set the printing plate placement position on the wrapping paper. The film base is indexed, and the film base is wound around a second belt winding mechanism which has the same dimensions as the first belt winding mechanism, is deviated at a predetermined angle with respect to the first belt winding mechanism, and is arranged so as to be able to approach and separate from the first belt winding mechanism. , the printing plate placement position indexed on the wrapping paper is projected onto the film base through a half mirror, and the printing plate is pasted at the indexed position projected on the film base, and then the first belt is wound. Mechanism and second bell 1~
The present invention is characterized in that printing is performed on the wrapping paper using a film base to which the printing plate is attached by placing the winding mechanism relatively close to the winding mechanism.

Another object of the present invention is to improve the efficiency of the work of attaching a printing plate to a film base and to prevent color shift during multicolor printing.

In order to achieve this object, a method for applying a printing plate to a film base according to another invention of the present application is to attach a wrapping paper to a first belt winding mechanism consisting of a plate cylinder and an adjustment cylinder, and to apply a first color onto the wrapping paper. The printing plate placement position for printing is determined, and the first
A second member having the same dimensions as the belt winding mechanism, being deviated at a predetermined angle with respect to the belt winding mechanism, and disposed so as to be able to approach and separate from the belt winding mechanism.
A film base for printing the first color is wound around the belt winding mechanism, and a printing plate placement position for the first color determined on the wrapping paper is projected onto the film base through a half mirror. A printing plate is affixed to the indexed position projected on the film base, and then the first belt winding mechanism and the second belt winding mechanism are brought relatively close to each other, and the film base to which the printing plate is affixed is used to wrap the paper. The first color is printed on the paper, the printing plate placement position for the second color is determined on the paper based on the printing pattern of the first color applied to the paper, and the second belt winding mechanism A new film base for printing the second color is installed on the holder, and the printing plate placement position for the second color determined on the paper roll is projected onto the film base through a half mirror. It is characterized by pasting a printing plate at the indexed position projected on the base.

Next, a method for applying a printing plate to a film base according to the present invention will be described with reference to the accompanying drawings, using preferred embodiments. FIG. 2 is a perspective view showing a schematic configuration of a printing plate pasting apparatus for carrying out the method according to the present invention, and in the illustrated embodiment, the apparatus includes a first belt winding mechanism 22;
．． 2nd belt winding machine @24. Plotter 26. The half mirror 28 and the inking mechanism 30 are basically constructed. That is, the first belt winding mechanism 22
432 and an adjustment cylinder 34 disposed horizontally so as to be able to variably adjust the distance between the axes.
The belt winding mechanism 24 has the same configuration and dimensions as the second belt winding mechanism 22, and has a
It is arranged offset by 0° and is composed of a plate cylinder 36 and an adjustment cylinder 38. As shown in FIG. 3, the first belt winding mechanism 22 is swung in the direction of the second belt winding mechanism 24 by an appropriate mechanism so that the plate cylinder 32 can be brought close to and separated from the plate cylinder 36. There is. This movement is relative, and the structure may be such that the second belt winding mechanism 24 swings toward the first belt winding mechanism 22, contrary to the illustrated embodiment. Note that there is a straight line connecting the axes of the plate cylinder 32 and the adjustment cylinder 34 of the first belt winding mechanism 22, and
The straight lines connecting the respective axes of the plate cylinder 36 and the adjustment cylinder 34 of the belt winding mechanism 24 are set to intersect each other at right angles as shown in FIG. The mechanism 24 is arranged vertically as shown)
, and the plate cylinder 32 and the plate cylinder 36 are positioned opposite to each other without contacting each other. In addition, the two belt winding mechanisms 2
2.24 are rotated synchronously and at a constant speed in the same direction by a common drive source (not shown).

In the plotter shown by reference numeral 26 in FIG. 2, the pen tip supported by a suitable guide rail reciprocates in the It is something to do. This plotter 26 moves only in the X direction as described above, but by driving the first belt winding mechanism 22, the paper roll (
(described later) moves in the Y direction, so the plotter 2
By combining the movement of 6 in the X direction and the movement of the wrapping paper in the Y direction, it is possible to move freely to any location. Therefore, by giving control commands from the computer to the drive motors of the plotter 26 and the first belt winding mechanism 22, accurate indexing of the printing plate placement position can be performed.

Next, as shown in FIG. 2, a half mirror 28 is disposed at a predetermined angle parallel to each axis of the plate cylinders 32 and 36 of the first and second belt winding mechanisms. It is set up. More precisely, the half mirror 28 is installed at a position γ that intersects the straight line connecting the axis α of the plate cylinder 32 and the axis β of the plate cylinder 36 at an angle of 30°. shall be set at an angle such that they intersect. When the half mirror 28 is observed from vertically above, an arbitrary position on the plate cylinder 32 (strictly speaking, the wrapping paper) of the first belt winding mechanism 22 is located on the second belt winding mechanism 28.
The image is projected onto the plate cylinder 36 (more specifically, the film base, which will be described later).

Further, in FIG. 2, reference numeral 30 is an inking mechanism (b), which basically consists of an anilox roll 40 (in the case of fonoxographic printing), a doctor blade 42, and an ink roller 44. Only when the first belt winding mechanism 22 is brought close to the second belt winding mechanism 24 to print on a wrapping paper (described later), the printing plate (denoted t!) comes into contact with the printing plate, and printing is performed on the printing plate. I'm about to do some ink transfer.

Also shown in the figure is a lifter 46, which is configured to move up and down along a vertical guide post. Note that this lifter 46 uses the half mirror 28 to move the position of the printing plate indexed to the endless belt made of paper wrapped around the first belt winding mechanism 22 to the second belt winding mechanism 24 using the half mirror 28. The image is projected onto the film base 48, and a printing plate is attached to the projected area during the work; the operator is moved up and down as appropriate so that he or she can sit on the lifter 46 and look into it from directly above the half mirror 28. It is something.

By using the printing plate affixing apparatus configured as described above, the printing plate affixing method according to the present invention is carried out as follows. In FIG. 2, an endless paper belt is obtained by wrapping paper 50 of a predetermined width around the plate cylinder 32 and adjustment cylinder 34 of the first belt winding mechanism 22 (in this case, both circles of the first belt winding mechanism (The distance between the axis of the cylinder is adjusted so that the dimensions of the paper belt are the same as the endless belt of the film base wound around the belt-type printing machine), and the printing plate for the first color is set by the plotter 26. The placement position is determined on the wrapping paper 50 located on the plate cylinder 32.

That is, while moving the plotter 26 in the X direction,
The first belt winding mechanism 22 is driven to move the paper roll 50 forward and backward in the Y direction, and by combining these movements, a position on the first paper roll 50 that is retreated by a distance χ1 from the reference line P as shown in FIG. Place the first plate so that the tip of the long printing plate faces T.
Perform position indexing for ogling.

Further, a film base 48 for printing the first color (this is attached to the printing unit for the first color of the belt type printing machine) is endlessly wound around the second belt winding mechanism 24 . Then, the operator stands on the beam lifter 46, raises the lifter, looks directly above the half mirror 28, and rotates the first belt winding mechanism 22, so that the first The printing plate indexing position for coloring is brought to the incident projection position of the half mirror 28. As a result, the index position is set to half mirror 2.
8 and is refracted at an angle equal to the incident angle, and the second belt winding mechanism 24 (this is the first belt winding mechanism 2
The image is projected onto a film base 48 mounted on a film base 48 (which is driven at a constant speed synchronously with 2).

The index position projected onto the film base 48 becomes the reference position for attaching the printing plate for the first color, so the operator places the printing plate 52 at this position.

Attach using double-sided adhesive tape, for example.

After the printing plate 52 is affixed to the film base 48 wound around the second belt winding mechanism 24 in this way, the first belt winding mechanism 22 is swung to move the mechanism 22 to the second belt winding mechanism 24 as shown in FIG. 2 to the belt winding mechanism 24, and print the first color on the wrapping paper 50.

That is, the ink application is performed by bringing the anilox roll 40 of the mechanism 30 into contact with the printing plate 52 attached to the film base 48 to transfer the ink, and then transferring the ink to the first belt winding mechanism 22.
One roll of paper 50 is printed by pressing the plate J] [32 toward the plate cylinder 36 of the second belt winding mechanism 24.
is printed in the first color. The obtained first color printing pattern is as shown by diagonal lines in FIG.

Next, based on the printing pattern of the first color applied on the wrapping paper 50, the printing plate placement position for the second color is determined on the wrapping paper using the plotter 26. In other words, as shown in Fig. 5, the position for the second color is set so that the tip of the printing plate of length L faces a distance III Z (however, Z = 7J) from the tip of the actually printed pattern. Perform indexing. In the end, the tip of the printing plate for the second color is 2, which is χ behind the reference line P by ten stones.

In addition, in the belt winding mechanism 24, the film base 48 on which printing of the first color has been completed is removed, and a new film base 48 for printing the second color is installed (this is attached to the printing unit for the second color of the belt type printing machine). )
is wrapped and attached to the mechanism 24. Then, the printing plate placement position for the second color indexed on the wrapping paper 50 is brought to the incident projection position of the half mirror 28. In this state, the indexing position for the second color applied to the wrapping paper 50 is transmitted through the half mirror 28 to the film base 48 for second color printing attached to the second belt winding mechanism 24. Project. Then, the operator placed on the lifter 46 looks again from above the half mirror 28, aligns the tip of the printing plate 52 with the indexed position projected on the film base 48 for second color printing, Attach using double-sided adhesive tape as above. In this way, the printing plate is attached to the film base 48 for printing the second color based on the position determined from the printing pattern of the first color.
When multicolor printing is performed by applying the film base for color and second color to each printing unit of a belt-type printing machine,
There is no misalignment between the printing plates, and therefore clear multicolor printing without color misregistration is achieved.

In this embodiment, the method of applying a printing plate when performing two-color printing has been described, but it goes without saying that this method can be used in its entirety for multi-color printing of three or more colors. That is, when a printing plate is attached to a film base for printing the third color, the following procedure is further continued. Print plate 52 using the procedure described above.
When printing is performed again on the wrapping paper 50 using the film base 48 for second color printing on which is pasted, printing of the pattern shown with diagonal lines in FIG. 6 is obtained. Therefore, as shown in Fig. 6, the tip of the long printing plate faces a distance of 7J (X, = 'X,') from the tip of the pattern where the second color was actually printed. As in, the plotter 2
6, the position for the third color is determined. In the end, the tip of the printing plate for the third color is z- with respect to the reference line P.
tx, +z will be behind.

Next, the film base 48 for printing the second color is removed from the second belt winding mechanism 24, and a new film base 48 for printing the third color (this is attached to the printing unit for the third color of the rotary printing machine). The printing plate of the third color indexed on the wrapping paper 50 attached to the first belt wrapping mechanism 22 is attached by winding it endlessly. The third color printing film base 48l; is projected through the third color printing film base 48l; By pasting the printing plate 52 using this projection position as a reference, a film base 48 for third color printing is obtained. Thereafter, the same procedure is repeated to apply the fourth color, fifth color, and so on.

Film base 48 with a printing plate attached by the method described above
is attached to a belt-type multicolor printing machine as shown in FIG. For example, in the case of three-color printing, assuming that the reference point P of the belt of each film base is set at a fixed position, in the printing unit L11 for the first color, the plate) l
When the leading edge of the printing plate 52 (this T is located a distance behind the reference point P as described above) reaches the printing contact point of the printing cylinder 18a and the printing cylinder 18a, the printing unit U of the second color prints the plate. Distance m'x from the printing contacts of cylinder 10b and impression cylinder 18b.

The tip of the printing plate 52 is located at the rear of the wall. Also the third
In the color printing unit 1, the plate cylinder 10c and the pressure 11F
The leading edge of the printing plate 52 is located a distance (X, +7J) behind the printing contact point of i18c. The distance between the printing contacts in each printing unit u, , u, , Lla (this is also the distance between the axes of each plate cylinder) is set to be equal to the dimensional length of the printing plate 52. Assuming χ,=X,=4=L, printing unit u+
When the printing of the first color is completed, the leading edge of the printing pattern of the first color on the continuous sheet 54 reaches the printing contact of the printing unit 1, where the printing of the second color is performed. At this time, in the printing unit 1, the printing plate 52 has arrived at a distance in front of the printing contact point.

When the printing of the second color in the printing unit 1 is completed, the leading edge of the printing pattern of the second color arrives at the printing contact of the printing unit i. At this time, the leading edge of the printing plate 52 in printing unit i also reaches and coincides with the printing contact point, so
Accurate color matching is achieved.

As explained in detail above, according to the method according to the present invention,
Pasting the printing plate onto the film base, which previously relied on the skill and intuition of the operator, can be automated in one step, reducing the time required for printing preparation and greatly increasing work efficiency. It is possible to achieve significant improvements.

Further, according to the method of the present invention, in a belt-type multicolor printing press, the printing plate mounting of the film base to be used in the preceding printing unit is based on the position, and the printing plate is attached to the film base to be used in the subsequent printing unit. Since the position of the printing plate is determined, there are many beneficial effects such as no color shift when performing multicolor printing as described above, and clear printing is achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a belt-type printing machine, FIG. 2 is a perspective view showing a schematic configuration of an apparatus for carrying out the method for applying a printing plate to a film base according to the present invention, and FIG. 4 to 6 are schematic diagrams showing a state in which the first and second belt winding mechanisms are relatively close to each other in the apparatus shown in FIG. FIG. 7 is an explanatory diagram showing the process of indexing the position of the printing plate, showing the plane of the first plate cylinder and the wrapping paper wrapped for adjustment; FIG. FIG. 2 is an explanatory diagram when printing is performed by being attached to a belt-type multicolor printing machine. Patent applicant Isowa Iron Works Co., Ltd.

Claims (2)

[Claims] (1) A wrapping paper is attached to a first belt winding mechanism consisting of a plate cylinder and an adjustment cylinder, and the printing plate placement position is indexed on this wrapping paper, and has the same dimensions as the first belt winding mechanism. The film base is wound around a second belt winding mechanism which is deviated at a predetermined angle with respect to the belt winding mechanism and is arranged so as to be able to approach and move away from the film base, and the printing plate placement position indexed on the wrapping paper is set as a half mirror.
is projected on the film base, and a printing plate is attached to the indexed position projected on the film base, and then the first belt winding mechanism and the second belt winding mechanism are brought relatively close to each other, and the printing plate is projected onto the film base. A method for applying a printing plate to a film base, characterized in that printing is performed on the wrapping paper using a film base to which a printing plate has been applied. (2) A wrapping paper is attached to a first belt winding mechanism consisting of a plate cylinder and an adjustment cylinder, and a printing plate placement position for printing the first color is determined on the wrapping paper, and the first belt winding mechanism A film base for printing the first color is wound around a second belt winding mechanism which has the same dimensions as the belt winding mechanism and is disposed at a predetermined angle with respect to the second belt winding mechanism so as to be able to approach and move away from the belt winding mechanism. The printed printing plate placement position for the first color is projected onto the film base through a half mirror, and the printing plate is pasted at the indexed position projected on the film base, and then the first belt winding mechanism and a second belt winding mechanism are placed relatively close together to print a first color on the wrapping paper using the film base to which the printing plate is attached, and a printing pattern of the first color applied to the wrapping paper is printed. As a reference, the printing plate placement position for the second color is determined on the paper roll, and a film base for printing the second color is newly attached to the second belt winding mechanism, and the position is indexed on the paper roll. The second color printing plate placement position is projected onto the film base through a half mirror, and the printing plate is pasted at the indexed position projected onto the film base. Method 7 is how to attach the stamp.