JPH08328267A - Plate making device and plate material positioning mechanism - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a plate making device and a plate material positioning mechanism for color printing, in which color misregistration or the like caused by image misregistration does not occur during color printing. . A plate material provided with first and second positioning members and first and second biasing members, and positioned by the first and second positioning members and the first and second biasing members. An exposure unit that forms a latent image by exposure to light, a processing unit that performs a latent image formation process of the latent image formed by the exposure unit, and an arrangement positional relationship that is the same as that of the first and second positioning members. Third and fourth positioning members and third and fourth
Of the plate making printing machine when the plate material is attached to the plate making printing machine with respect to the plate material positioned by the third and fourth positioning members and the third and fourth biasing members. And a forming portion that forms a positioning portion on the printing material for positioning the mounting position of the printing material with the member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate making device for color printing and a plate material positioning mechanism. In recent years,
CTS (computerizd typesetting sy) for publications and newspapers
Stem: electronic editing typesetting system is remarkable, and plate making process consisting of exposure part and processing part-formation process to form positioning part on plate material for positioning mounting position of plate material in plate making press-plate making 2. Description of the Related Art A printing system including an offset printing process executed by a printing machine is used.

Along with this, the plate making process has been rationalized, and OPC
(Organic photo conductor) With the development of printing materials, it has become possible to directly expose and write on printing materials. On the other hand, the colorization of printing is advancing rapidly, and for this reason, the set position of each plate material (4 plates of red plate, blue plate, yellow plate and black plate) at the time of exposure in the plate making process, and It is required that the set position for winding each plate material on the four corresponding plate cylinders of the rotary press be highly accurate.

[0003]

2. Description of the Related Art A plate making process is carried out by a plate making apparatus as shown in FIG. 2 in which the following parts are connected by a conveyor.

The plate making apparatus comprises an exposure section, a processing section and a forming section. The exposed portion is a rectangular OPC plate material 1 having a predetermined size (for example, one having a photosensitive layer formed on the surface of an aluminum base plate having a thickness of about 0.3 mm, hereinafter referred to as a plate material).
Plate feeding unit 3 with hopper 2 for stacking and holding about 500 sheets
Then, the plate materials 1 provided with the optical unit 5a and the charger 5b and fed one by one from the plate feeding section 3 are positioned and fixed on the table 4, and exposed with a semiconductor laser to expose a latent image (static image) for each color. Exposure unit 6 for forming a latent image).

The processing section includes a developing section 7 for developing the plate material 1 exposed by the toner mixed in the liquid, a drying section 8 for drying the developed plate material 1, and a side edge portion of the plate material 1. An edge cleaning unit 9 for removing the adhered toner and a fixing unit 10 for heating and fixing the toner image on the plate material 1 whose side edges have been cleaned are provided.

The processing section further includes a cooling section 11 for air-cooling the fixed plate material 1 with a fan or the like, and a shower of strong alkali and weak alkali on the cooled plate material 1 to remove the photosensitive agent in the non-image area. An elution part 12 that dissolves and flows out, a gum part 13 that homogenizes the plate material 1 from which the photosensitizer in the non-image part has been removed by a desensitizing process (a process that prevents the adhesion of hand oil etc.), and a gum. And a drying unit 14 for drying and cooling the plate material 1 sent from the unit 13.

The red plate, the blue plate, the yellow plate and the black plate are generally made by the same plate making device described above. The forming part is a part for forming a positioning part on the plate material in order to position the mounting position of the plate material on the plate-making printing machine.

Each part of the plate making apparatus having the above-described structure is connected to the plate material 1.
Each plate is made by passing through and being processed. A positioning structure for setting the plate material 1 on the table 4 in the exposure unit 6 will be described below with reference to FIG.

The first positioning member, that is, the table 4 is brought into contact with two desired points on the selected long side of the rectangular plate material 1 (two points apart from each other so that they are close to the corners of the plate material 1, respectively). Two positioning pins 19a are arranged.

A second positioning member, that is, a positioning pin 19b, which abuts the selected short side of the plate material 1, is arranged on a straight line which is orthogonal to the straight line connecting the two positioning pins 19a. The distance b from the selected corner of the plate 1 to one positioning pin 19a is short, and the distance c to the other positioning pin 19a is large. In addition, the positioning pin 19 from the selected corner of the plate material 1
The distance a to b is almost half the length of the short side.

On the other hand, forward movement toward the positioning pin 19a
The plate 1 is pushed in the direction of the positioning pin 19a by performing a linear reciprocating reciprocating motion (for example, reciprocating by driving an air cylinder) and advancing to contact another long side of the plate 1,
A first urging member for positioning in the direction parallel to the short side, that is, two positioning pins 19c is attached to the table 4.

In addition, the forward movement toward the positioning pin 19b
A linear reciprocating motion of retreat (for example, a reciprocating motion by driving an air cylinder) is performed, and by advancing and contacting the other short side of the plate material 1, the plate material 1 is pushed toward the positioning pin 19b, and a direction parallel to the long side. The second urging member for positioning, that is, the positioning pin 19d is mounted on the table 4.

The above-mentioned positioning pins 19a, 19b, 19c, 19
d allows the table to descend below and rise vertically above. This makes it easy to carry the plate material 1 onto the table 4 from the previous step and to carry the plate material 1 from the table 4 to the next step.

The respective pins are arranged as described above, and the selected long side of the plate material 1 carried on the table 4 by the positioning pin 19c is brought into contact with the positioning pin 19a, and the positioning pin 19a is positioned.
At 19d, the selected short side of the plate material 1 is brought into contact with the positioning pin 19b to position the plate material 1 and then exposed by a semiconductor laser to form a latent image at a predetermined position on the plate material 1. are doing.

The forming unit includes a punching process performed by using a punching device and a bending process performed by using a bending device. In the punching process, the plate material 1 is positioned and set on the table, and then, as shown in FIG. 4, a positioning notch (not shown) is punched at each central portion of the opposite short sides of the plate material 1. At the same time, a positioning hole 15 is drilled on one short side in the vicinity of the positioning notch.

The positioning hole 15 is for setting the longitudinal position of the plate material 1 in the bending step, and the positioning notch is the position in the width direction of the plate material 1 in the bending step. It is for setting the straightness and.

The positioning hole 15 and the positioning notch are used for positioning when the plate material 1 is wound around the plate cylinder in a plate-making printing machine for performing offset printing. In the bending step, each of the opposite side edges on the short side is bent inward in a V shape.

The punched and bent plate materials 1 are stacked on a stacker (not shown). The plate materials 1 stacked on the stacker are taken out from the stacker, wound around the outer peripheral surface of the plate cylinder corresponding to the plate color of the plate-making printing machine (for example, rotary press), and fitted into the engaging grooves provided on the outer peripheral surface of the plate cylinder. The plate material 1 is wound around the plate cylinder by inserting and engaging the respective bent portions.

[0019]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention After plate making as described above,
The plate material is wound and mounted on the plate-making printing machine, but if the mounting position is displaced, color misregistration or the like occurs. Therefore, after the plate making process, the punching device punches the positioning hole and the positioning notch, but if the position of the positioning hole or the like deviates even slightly from the reference side of the plate material, it is formed in the exposed portion. It will be out of alignment with the image.

Therefore, in the case of printing images by superposing them a plurality of times as in color printing, there is a problem in that the images for each color are misaligned and appear as color misregistration. The present invention was created in view of these points,
An object of the present invention is to provide a plate making apparatus and a plate material positioning mechanism in which color misregistration due to image misregistration does not occur during color printing in which plates are overlapped a plurality of times.

[0021]

In order to achieve the above-mentioned object, a plate making apparatus of the present invention comprises a first positioning member,
The second positioning member, the first biasing member that biases the plate material in the direction toward the first positioning member, and the plate material
A second biasing member that biases in a direction different from the biasing direction of the biasing member toward the second positioning member, and the first and second positioning members and the second positioning member An exposure unit is provided for forming a latent image on the plate material positioned by the first and second biasing members by exposure.

Further, the image forming apparatus further comprises a processing section for carrying out a processing for revealing the latent image formed by the exposure section. Further, the third and fourth positioning members arranged in the same positional positional relationship as the positional positional relationship of the first and second positioning members, and the plate material
And a third biasing member that biases the plate material in a direction toward the positioning member and a direction different from the direction in which the third biasing member biases the plate material and toward the fourth positioning member. And a fourth urging member, and attaches the plate material to the plate making printing machine with respect to the plate material positioned by the third and fourth positioning members and the third and fourth urging members. At this time, a forming portion is provided to form a positioning portion for positioning the mounting position of the plate material with the member of the plate-making printing machine.

According to the present invention, the reference long side and the reference short side are selected for the plate material, and the first positioning member (positioning pin 19a in the figure) and the reference short side are opposed to the reference long side in the exposure section. And a second positioning member (positioning pin 19b in the figure) is provided, and a first biasing member (shown by positioning pin 19c in the figure) for biasing the plate material in the direction of the first positioning member and a second positioning member A second urging member (indicated by a positioning pin 19d in the figure) for urging the plate material in the direction of the positioning member is provided.

In the forming portion, a third positioning member (positioning pin 20a in the figure) facing the reference long side and a fourth positioning member (positioning pin 20 in the figure) facing the reference short side.
b) is provided, and a third biasing member (shown by a positioning pin 20c in the figure) that biases the plate material toward the first positioning member and a fourth biasing member that biases the plate material toward the fourth positioning member are provided. Urging member (shown by the positioning pin 20d in the figure) is provided.

In the exposure section and the formation section, the positional relationship between the first and second positioning members and the third and fourth positioning members is made equal. Furthermore, the first and second
The urging member and the third and fourth urging members have the same relational arrangement position.

As a result, the image position from the reference long side and the reference short side formed on the plate material in the exposure section and the image position from the reference long side and the reference short side formed on the plate material in the forming section There is no deviation. Therefore, even when the images are printed by superimposing a plurality of times such as in color printing, color misregistration does not occur.

According to a second aspect of the present invention, there is provided a plate material positioning mechanism comprising a first positioning member, a second positioning member, and a first biasing member for biasing the plate material in a direction toward the first positioning member. A second urging member for urging the plate material in a direction different from the direction in which the first urging member urges and toward the second positioning member, and An exposure unit that forms a latent image on the plate material positioned by the second positioning member and the first and second biasing members by exposure; and a processing unit that performs the latent image formation process of the latent image formed by the exposure unit. A plate making apparatus comprising a forming unit that forms a positioning portion for positioning the plate material attachment position with a member of the plate making printer when the plate material is attached to the plate making printer. A positioning mechanism for the plate material in the forming section, the first and second positions A third, fourth positioning member are arranged in a position relationship same position relationship and fit member.

Further, a third urging member for urging the plate material toward the third positioning member, and a fourth urging member different from the urging direction of the plate member by the third urging member And a fourth biasing member that biases the positioning member toward the positioning member.

A plate material positioning mechanism according to a third aspect of the present invention includes a third positioning member, a fourth positioning member, and a third biasing member for biasing the plate material toward the third positioning member. A third biasing member that biases the plate material in a direction different from the biasing direction of the third biasing member and toward the fourth positioning member, When the plate material is mounted on the plate making printing machine, the plate material positioned by the positioning member of No. 4 and the third and fourth urging members is positioned with respect to the member of the plate making printing machine. Forming portion for forming a positioning portion for printing on the plate material, an exposure portion for forming a latent image on the printing material by exposing the printing material in a state where the printing material is positioned by the positioning mechanism, and a latent image formation process for the latent image formed by the exposure portion. In a plate making apparatus including a processing unit for performing A plate material of the positioning mechanism in, a third, first, second positioning member are arranged in a fourth position relation between the same position relationship with the positioning member.

The first urging member for urging the plate material toward the first positioning member, and the second urging member in a direction different from the urging direction of the plate material by the first urging member And a second urging member for urging in the direction toward the positioning member.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the drawings. The same reference numerals indicate the same objects throughout the drawings.

FIG. 1 is a plan view of a positioning structure in a punch device of the present invention, FIG. 2 is a side view of a plate making device to which the present invention is applied, and FIG. 3 is a plan view of a plate material positioning structure in an exposure section. It is a figure.

The plate making apparatus comprises an exposure section, a processing section and a forming section. As shown in FIG. 2, the exposure section is provided with a plate supply section 3, an optical unit 5a and a charger 5b, and positions the plate materials 1 sent from the plate supply section 3 one by one on a table 4. And an exposure unit 6 that forms a latent image (electrostatic latent image) for each color by fixing and exposing with a semiconductor laser.

The processing section includes a developing section 7 and the developed plate material 1.
A drying section 8 for drying the toner, an edge cleaning section 9 for removing the toner, a fixing section 10, a cooling section 11 for air cooling, an elution section 12 for dissolving and flowing out the photosensitive agent in the non-image area, and a non-image area. The gum part 13 for homogenizing the plate material 1 from which the photosensitizer has been removed by performing desensitizing treatment (treatment for preventing the adhesion of hand oil etc.)
And a drying section 14 for drying and cooling the plate material 1 sent from the gum section 13.

In the forming section, a positioning section is formed on the plate material for positioning the mounting position of the plate material in the plate-making printing machine. In the punching device used in the forming unit for punching the positioning holes for setting in the plate-making printing machine after plate-making the rectangular plate material 1, as shown in FIG.
Contacting two desired long sides (long sides used as a reference for positioning in the exposure unit) of the rectangular plate material 1 at desired two locations (two locations apart from each other as desired near the corners of the plate material 1) Three positioning members, that is, two positioning pins 20a are provided.

A fourth positioning member, that is, a positioning pin, which abuts the selected short side of the plate material 1 (the short side used as a positioning reference in the exposure section) on a straight line orthogonal to the line connecting the two positioning pins 20a. 20b is installed.

The distance b from the selected corner of the plate material 1 to one positioning pin 20a is the distance b to the first positioning member or positioning pin 19a arranged on the table 4 of the exposure section (shown in FIG. 3). And the distance c from the selected corner to the other positioning pin 20a is equal to the distance c to the positioning pin 19b arranged on the table 4 of the exposure section (shown in FIG. 3).

Further, the distance a from the selected corner of the plate material 1 to the positioning pin 20b is the distance a to the second positioning member or the positioning pin 19b arranged on the table 4 of the exposure section (shown in FIG. 3). Is equal to.

Further, the diameters of the positioning pins 20a, 20b are made equal to the diameters of the positioning pins 19a, 19b of the exposure section shown in FIG. On the other hand, a linear reciprocating motion of forward / backward movement (for example, reciprocating motion by driving an air cylinder) is performed toward the positioning pin 20a, and the forward movement is made to contact the other long side of the plate material 1 to move the plate material 1 to the positioning pin 20a. A third urging member, that is, two positioning pins 20c, which press in the direction of 20a and perform positioning in a direction parallel to the short side, is attached to the table 21.

In addition, forward movement toward the positioning pin 20b
A linear reciprocating motion of retreat (for example, a reciprocating motion by driving an air cylinder) is made to move forward and to abut against the other short side of the plate material 1, thereby pushing the plate material 1 toward the positioning pin 20b, in a direction parallel to the long side. A fourth urging member for positioning, that is, a positioning pin 20d is mounted on the table 21.

The structure and arrangement position of the positioning pins 20c, 20d are equal to the structure and arrangement position of the positioning pins 19c, 19d arranged on the table 4 of the exposure section shown in FIG.

The diameter of each of the positioning pins 20c and 20d is made equal to the diameter of the positioning pins 19c and 19d of the exposure section shown in FIG. The positioning pins 20a, 20b, 20c, 20d of the punching device are arranged so that they can be lowered below the table 21 and vertically raised above the table 21, so that the drying unit 14
It is made easy to carry the plate material 1 onto the table 21 from the table 21 and to carry the plate material 1 from the table 21 to the next bending step.

As described above, the positioning pins 20a, 20b, 20c and 20d are arranged on the table 21 of the punching device of the forming section, and the plate material 1 carried onto the table 21 by the positioning pins 20c.
The selected long side of is contacted with the positioning pin 20a, and the selected short side of the plate material 1 is positioned with the positioning pin 20d.
The plate material 1 is positioned by bringing it into contact with b, and then the positioning hole 15 and the positioning notch are punched.

As described above, the reference long side and the reference short side of the plate material are made the same in both the exposure unit 6 and the punching unit in the forming unit.
Moreover, since the positioning pins having the same arrangement positional relationship are adopted, there is no error in the setting position, and the positioning hole or the like is punched at a predetermined position with high accuracy.

Therefore, even if a plurality of plate materials of different colors are set on the corresponding plate cylinders of a plate-making printing machine (for example, a rotary press) and color printed, no positional deviation occurs between the plate materials. Color shift does not occur.

[0046]

Since the present invention is constituted as described above, it has the following effects.

For example, even in the case where a plurality of plates are overlapped and printed as in color printing, the images are the same, so that color misregistration does not occur.

[Brief description of drawings]

FIG. 1 is a plan view of a positioning structure in a punch device of the present invention.

FIG. 2 is a side view of a plate making apparatus to which the present invention is applied.

FIG. 3 is a plan view of a plate material positioning structure in an exposure unit.

FIG. 4 is a plan view of the plate material.

[Explanation of symbols]

1 plate material 2 hopper 3 plate feeding section 4,21 table 5a optical unit 5b charger 6 exposure section 7 developing section 8,14 drying section 9 edge cleaning section 10 fixing section 11 cooling section 12 elution section 13 gum section 15 positioning hole 19a, 19b, 19c, 19d Positioning pin 20a, 20b, 20c, 20d Positioning pin

Claims (3)

[Claims] 1. A first positioning member, a second positioning member, a first biasing member for biasing a plate material in a direction toward the first positioning member, and the plate material A second biasing member that biases in a direction different from the biasing direction of the biasing member toward the second positioning member, and the first and second positioning members are provided. And the first,
An exposure unit that forms a latent image on the plate material by exposure by a second biasing member, and a processing unit that performs a latent image formation process on the latent image formed by the exposure unit; Third positioning member arranged in the same positional positional relationship as that of the positioning member, and third biasing member for biasing the plate material in the direction toward the third positioning member. And a fourth biasing member that biases the plate material in a direction different from the direction in which the third biasing member biases toward the fourth positioning member. A member of the plate making printing machine when the plate material is attached to the plate making printing machine with respect to the plate material positioned by the third and fourth positioning members and the third and fourth biasing members, In which a positioning portion for positioning the mounting position of the plate material is formed between the plate material. A Department, plate making creating apparatus characterized by comprising comprises. 2. A first positioning member, a second positioning member, a first biasing member for biasing a plate material in a direction toward the first positioning member, and the plate material A second biasing member that biases in a direction different from the biasing direction of the biasing member toward the second positioning member, and the first and second positioning members are provided. And the first,
An exposure unit that forms a latent image on the plate material positioned by the second biasing member by exposure, a processing unit that performs the latent image formation process of the latent image formed by the exposure unit, and a plate-making printing of the plate material. And a forming portion for forming a positioning portion on the plate material for positioning the mounting position of the plate material with a member of the plate-making printing machine when the plate-making machine is mounted on the machine. The plate material positioning mechanism, the third and fourth positioning members arranged in the same positional relationship as the positional relationship of the first and second positioning members, and the plate material A third biasing member that biases the plate member in a direction toward the third positioning member, and a direction that is different from the direction in which the plate member is biased by the third biasing member and that faces the fourth positioning member. And a fourth urging member for urging the plate material. Positioning mechanism. 3. A third positioning member, a fourth positioning member, a third urging member for urging the plate material in a direction toward the third positioning member, and the plate material in the third position. A fourth urging member for urging the urging member in a direction different from the urging direction of the second urging member toward the fourth locating member, and the third and fourth locating members. And the third,
A positioning portion for positioning the plate material, which is positioned by the fourth urging member, at the mounting position of the plate material when the plate material is mounted on the platemaking printing machine. A forming section for forming a latent image on the plate material, an exposing section for forming a latent image on the plate material by exposing the plate material with a positioning mechanism, and a latent image revealing process for the latent image formed by the exposing section. A plate material positioning mechanism in the exposure unit in a plate making apparatus including a processing unit for performing, arranged in the same positional positional relationship as the positional positional relationship of the third and fourth positioning members. First and second positioning members, a first biasing member that biases the plate material in a direction toward the first positioning member, and the plate member is biased by the first biasing member. In a direction different from the direction and toward the second positioning member. A plate member positioning mechanism comprising a second urging member for urging.