JP2003145707A - Newspaper offset rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a newspaper offset rotary press capable of altering and moving the standard position of the printing plate mounted on an equal-size plate cylinder, which has no allowance for a space for incorporating a complicated register adjusting device. SOLUTION: The newspaper offset rotary press is equipped with the printing plate 1, which is mounted in the slit groove 7a axially formed to the plate cylinder 7 having four-page width in one page peripheral length and has notches 2 becoming standard positions provided at the position near to the side end edges thereof, and a register adjusting rod arranged in the slit groove 7a so as to be movable axially and having the locking projections 6a locked with the notches 2 of the printing plate 1 provided to the leading end thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a newspaper offset rotary press using a web.

[0002]

2. Description of the Related Art In multicolor printing using an offset rotary printing machine, it is a condition for obtaining clear and good printing that there is no image shift on the printing surface.

However, the multicolor printing has the following problems. In the case of web-fed rotary printing presses, where there is a tendency toward a tower unit for multicolor printing, the width of the web is related to the properties of the web itself and the dampening water absorption during printing. Then, a so-called fan-out phenomenon occurs. The fan-out phenomenon is a phenomenon in which a sheet of paper running along the center of the machine stretches slightly in the lateral direction when passing through the blanket cylinder. Due to this fan-out phenomenon, the pattern on the printing surface is printed with a shift toward the center of the running paper for each color. In addition to these factors, the cause of misregistration is various, such as changes in various conditions during printing, plate making errors, machine manufacturing errors, and plate mounting errors. FIG. 7 is an explanatory diagram of setting a reference position of a conventional printing plate. Here, the description will be made assuming that the printing plate has a length of 1 page and a width of 2 pages and the plate cylinder has a circumference of 1 page and a width of 4 pages.

(1) A PS plate (Pre-Sensitize), which is a printing plate in which a photosensitive material is previously coated on a support.
ed Plate), forming a ○ -shaped positioning hole 2a and a □ -shaped positioning hole 2b in the raw printing plate 1 on which the contents of the newspaper have not been printed, and at the center of the 1 page width of the 2 page width Forming two notches 2c serving as a reference and two notches 2d for positioning the printing plate relative to the ground side. Notches 2c and 2d and positioning hole 2
A and 2b are created by a device such as a plate puncher (see FIG. 7A).

(2) Similarly, on the negative film 3 on which the newspaper surface is copied, the ○ -shaped positioning holes 2a and □ are located at the same positions as the ○ -shaped positioning holes 2a and □ -shaped positioning holes 2b of the printing plate.
A positioning hole 2b having a shape is formed. ○ shaped positioning hole 2a
The plate 1 and the film 3 are aligned with each other on the basis of the □ -shaped positioning holes 2b, and baked to complete the plate (see FIG. 7C).

(3) Next, in order to mount the completed printing plate 1 on the plate cylinder, plate bending is performed on the edge side and the edge side of the plate (see FIG. 7 (d)).

FIG. 8 is a view showing a state in which the printing plate is mounted on the plate cylinder. For mounting the printing plate 1 on the plate cylinder 7, see FIG.
As shown in (b), the gripper side and the gripper end side are inserted and attached to the slit groove 7a of the plate cylinder 7.

A four-page width plate cylinder is used to drive a two-page width drive side.
When considered separately on the operation side, two register pins (positioning block) 10 fixedly provided on each side
4 notches 2 provided in (1) on a and 10b
C and 2d are fitted and a reference position is taken out. Regarding the four notches 2c and 2d, the notch 2c on the left side of the plate 1 is used as a reference position. The notch of the plate having a width of 2 pages is provided with a notch for taking a reference position at the center facing the top and bottom for each page width, and either the left side or the right side is used as a reference depending on the convenience of use. Either the left or right register pin is the reference. Standard cutout 2
c is on the left side here, but the width of the notch 2c serving as a reference is set to be substantially the same as the width of the register pin 10a provided on the plate cylinder 7, and is fitted tightly to the reference position. Is taken. The notch 2d for plate positioning on one side is different from the notch 10a serving as a reference,
Register pin 10b that does not serve as a register pin reference
It is provided with a wide width in which is fitted.

Conventionally, as described above, a standard for accurately mounting the printing plate on the plate cylinder is provided, and in the case of overprinting in single color or multicolor printing, an accuracy of several tens of microns is required. , The reference position is important. Therefore, by utilizing a pin hole opened in the central portion of the top and bottom of the printing plate, it is fitted into a register pin (positioning block) of the plate cylinder to provide a reference position. In this way, in the newspaper platemaking process,
A consistent pin system is adopted (pin register system). Further, usually, the register pin attached to the plate cylinder is fixed, and the register misalignment is adjusted by moving the plate cylinder itself.

Therefore, as a method for adjusting the misregistration at the plate cylinder level, a method of adjusting the positions of the plate cylinder and the printing plate mounted on the plate cylinder to eliminate the image misregistration has been conventionally used. The specific method is disclosed in JP-A-62-1
No. 156954, Japanese Patent Laid-Open No. 7-241976,
It is described in JP-A-8-192507. For example, in Japanese Patent Laid-Open No. 62-156954, the register plate can be moved in the axial direction by a lateral register adjusting device to change the reference position for plate attachment. In other words, a device for moving the register pin in the axial direction or the like by an amount of misregistration is incorporated in advance for adjustment.

[0011]

However, in the plate cylinder of a rotary printing press, by narrowing the mounting groove gap of the printing plate to about half, the narrow gap for reducing the vibration at the time of printing is progressing. Incorporating the device for the inside of the plate cylinder complicates the entire structure including the processing, and obstacles in terms of cost and maintenance cannot be ignored. In particular, when the groove of the plate cylinder is a slit groove type, that is, when there is no winding device etc. and only the groove for inserting and mounting both ends of the printing plate is provided in the axial direction of the plate cylinder, further installation Becomes difficult (Fig. 8
(See (b)).

Further, in order to realize space saving of the rotary press itself, when the plate cylinder of the rotary printing machine is a 1 × cylinder (about half the diameter of the 2 × cylinder), the conventional 1 × cylinder has There is not enough room to install a complex register adjustment device, and its installation is difficult.

Further, regarding the reference position for accurately mounting the printing plate, here, the printing plate having a length of 1 page and a width of 2 pages is arranged on the left and right sides (on the drive side. (Operating side) Two sheets are attached, but according to the concept of the conventional plate attachment standard, in the case of the left and right conventional plate attached to the plate cylinder, the reference is inevitably the left and right of the two notches of the plate. It is necessary to decide on either one (for example, when the drive side printing plate is based on the left cutout, the operating side printing plate is also operated based on the left cutout). In the present situation), when the adjusting device is provided, it has to be provided so as to extend to a position apart from the end face of the plate cylinder. This is a factor that complicates the device, as is apparent from the publications disclosed above.

In view of the above, the present invention provides a newspaper offset rotary press capable of changing the reference position of a printing plate mounted on a 1x plate cylinder with no space for incorporating a complicated register adjusting device by a simple mechanism. Is provided.

[0015]

According to the present invention, a newspaper offset rotary press is mounted in a slit groove formed in an axial direction on a plate cylinder having a perimeter of one page and a width of four pages, and a notch is used as a printing plate. A plate provided near the side edge of the plate, and a locking projection at the tip that is arranged in the slit groove so as to be movable in the axial direction and that locks in the notch of the plate at the reference position. It is characterized by having an adjusting rod for register adjustment.

Further, according to the present invention, in a newspaper offset rotary press, a slit is formed in the axial direction of a plate cylinder having a perimeter of one page and a width of four pages, and notches are provided at four corners of the printing plate. Plate, and an adjusting rod for register adjustment, which is arranged in the slit groove so as to be movable in the axial direction and has a contact surface with which a notch of the plate comes into contact at a reference position. .

The adjusting rods are provided on the operating side and the driving side of the plate cylinder to adjust the reference position of each printing plate.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 In this embodiment, the reference position of the printing plate itself is set as close to the end face of the plate cylinder as possible, that is, at a position close to the side edge of the printing plate. The length of the movable adjustment member can be shortened.

FIG. 1 is a diagram showing the process of forming the printing plate of this embodiment.

(1) Four notches 2 for locking are formed with a puncher or the like on the printing plate 1 in which the content of the newspaper is not printed. It should be noted that a circle-shaped positioning hole and a square-shaped positioning hole may be formed for registering the printing plate and the film described in the prior art.

In this embodiment, the locking notches 2 at four locations are used.
Unlike the notch position of the conventional plate, the position of is provided on both the driving side and the operating side as close as possible to the end face of the plate cylinder, that is, at a position close to the side edge of the plate (Fig. 1 ( See a)).

(2) Similarly, a positioning hole 4 is formed in the negative film 3 on which the newspaper surface is shown. The plate 1 is positioned by the plate pins 5 at three positions, the negative film 3 is positioned by the positioning holes, and the negative film 3 is overlapped with the plate and baked to complete the plate 1 (see FIG. 1B).

(3) Next, in order to mount the completed printing plate 1 in the slit groove of the plate cylinder, plate bending is performed on the edge side and the edge side of the plate 1 (see FIG. 1 (c)). .

(4) The gripper side and the gripper end side of the printing plate 1 are mounted in the slit grooves 7a of the plate cylinder 7 (see FIG. 1 (d)).

FIG. 2A is a perspective view of the adjusting rod used in the present invention. In FIG. 2 (a), a locking projection 6a for locking the locking notch of the printing plate is formed at one end of the adjusting rod 6, and the other end has a scaled handle attached to the end of the plate cylinder. A screw 6b that is screwed to 8 is formed. The locking projections 6a correspond to the register pins described in the setting of the reference position of the conventional printing plate (FIG. 7).

As shown in FIGS. 2B and 2C, the adjusting rod 6 is disposed in the slit groove 7a formed in the axial direction of the plate cylinder 7 and is prevented from rotating in the slit groove 7a. By rotating the scaled handle 8 in the forward or reverse direction, it moves forward or backward along the slit groove 7a.

The adjusting rod 6 is moved by the amount of misalignment to position the locking projection 6a at the reference position. The misregistration amount is ± 1.5 mm in the case of the misregistration amount due to the fan-out, and the other misregistration amounts are adjusted by moving the adjustment member by the amount of misalignment by performing trial printing once. The widths of the four cutouts of the plate are substantially the same as the width of the register pin, that is, the locking projection 6a that serves as a reference for positioning, so that the plate is fitted so as not to move tightly.

After that, the plate 2 is mounted on the plate cylinder 7 by locking the notch 2 for locking the plate on the locking protrusion 6a. Since the locking notch 2 of the printing plate 1 is provided at a position near the edge of the plate cylinder, the adjustment rod 6 can be short.

In FIG. 1D, the cutout 2 formed in the printing plate 1 on the surface of the plate cylinder 7 after bending the plate is easy to understand, and the locking projection 6a is taken at the reference position.
The notch 2 of the printing plate 1 that is inserted obliquely into the slit groove 7a is the locking projection 6a whose reference position is taken.
Then, as shown in FIG. 2C, the slit groove 7a is fitted and mounted in the slit groove 7a.

Embodiment 2 In this embodiment, the reference position of the printing plate itself is provided at the four corners of the difference plan, so that the length of the adjustment member movable in the axial direction can be shortened.

FIG. 1 is a diagram showing the process of forming the printing plate of this embodiment.

(1) A rectangular notch 9 is formed by a puncher or the like in order to provide accurate positioning widths at the four corners of the printing plate (PS plate) 1 in which the contents of the newspaper are not printed (FIG. 3). (See (a)).

(2) Similarly, a positioning hole 4 is formed in the negative film 3 on which the newspaper surface is shown. The plate 1 is positioned by the plate pins 5 at three positions, the negative film 3 is positioned by the positioning holes, and the negative film 3 is stacked on the plate and baked to complete the plate 1 (see FIG. 3B).

(3) Next, in order to mount the completed printing plate 1 in the slit groove of the plate cylinder, plate bending is performed on the gripping side and the gripping edge side of the printing plate 1 (see FIG. 3 (c)). .

(4) The gripping side and the gripping edge side of the printing plate 1 are mounted in the slit grooves 7a of the plate cylinder 7 (see FIG. 3 (d)).

FIG. 4A is a perspective view of the adjusting rod of the present invention. In FIG. 4, one end of the adjusting rod 6 is formed with a contact surface 6c for contacting a rectangular notch 9 formed in a corner of the printing plate 1, and the other end thereof is adjusted in the first embodiment shown in FIG. Like the rod 6, a screw 6b for moving the adjusting rod 6 is formed.

As shown in FIG. 4B, the adjusting rod 6 is arranged in the slit groove 7a formed in the axial direction of the plate cylinder 7 and is prevented from rotating in the slit groove 7a. Is rotated forward or backward to move forward or backward along the slit groove 7a.

The adjusting rod 6 is moved by the amount of misregistration to position the contact surface 6c at the reference position, and then the notch 9 formed at the corner of the plate 1 is pressed against the contact surface 6c and the plate 1 is pressed.
Is attached to the plate cylinder 7. The amount of deviation is adjusted in the same manner as in the first embodiment.

In FIG. 3 (d), the notch 9 formed on the plate 1 on the surface of the plate cylinder 7 after bending the plate is easy to understand on the contact surface 6c at the reference position. The expression is such that it is abutted and worn,
Actually, the printing plate 1 is inserted obliquely into the slit groove 7a.
The notch 9 is attached to the contact surface 6c at the reference position by abutting it in the slit groove 7a as shown in FIG. 4 (c).

Next, one page circumference used in the present invention is 4
The page width plate cylinder will be described.

The plate cylinder having a perimeter of one page and a width of four pages has a double structure in which the core portion of the driving-side plate cylinder extends into and fits into the hollow cylindrical portion of the operating-side plate cylinder. Structure in which parts are axially supported by intermediate bearings, structure by which axial bearings are axially supported by recesses formed at the opposite ends of the non-printing portions of the drive-side plate cylinder and operating-side plate cylinder, respectively A structure in which the plate cylinder and the operating side plate cylinder are axially supported by intermediate bearings on a plate cylinder supporting member supported between the operating side frame and the drive side frame, or a single non-divided plate cylinder, It is possible to adopt a structure in which a circumferential groove formed on the circumference of the middle portion of the body is axially supported by an intermediate bearing.

The plate cylinder has a non-printing area (non-printing area), and by using an intermediate non-printing portion of the plate cylinder to support it with an intermediate bearing, the plate cylinder having a perimeter of one page and a width of four pages. It is possible to supplement the rigidity and flexure that cannot be obtained by itself.

The register adjustment is performed by moving the adjusting rod in the axial direction arranged in the slit groove formed in the axial direction of the plate cylinder.

FIG. 5 shows the perimeter of one page used in the present invention.
It is a figure which shows one Example of the plate cylinder of page width.

The plate cylinder 7 of the printing section of the rotary press is the drive-side plate cylinder 11
a and the operating side plate cylinder 11b, each plate cylinder 11a, 11
b is one page perimeter, each of which is two pages wide, and one page perimeter is four pages wide.

The core portion 11c of the driving side plate cylinder 11a has a double structure in which the core portion 11c extends into and is fitted into the hollow cylindrical portion of the operation side plate cylinder 11b. The core portion 11c may be provided on one of the plate cylinders and the hollow cylindrical portion may be provided on the other. Ends of the driving side plate cylinder 11a and the operating side plate cylinder 1b respectively have bearings 16a of the driving side frame 16 and the operating side frame 17,
A register adjusting mechanism pivotally mounted on 17a and capable of performing register adjustments in the up-and-down (circumferential) direction and the left-right direction separately is equipped. In this embodiment, the adjusting rod of the register adjusting mechanism is used.
A blanket cylinder 12 is in contact with the plate cylinder 7.

Between the end portions of the non-printing portion where the driving side plate cylinder 11a and the operating side plate cylinder 11b face each other, the core portion 11 is arranged in the circumferential direction.
A circumferential groove 11d reaching c is formed, and the core portion 11c of the driving side plate cylinder 11a is axially supported by the intermediate bearing 13. Intermediate bearing 13
Is supported by a bearing blanket 4 of a frame stay 5 fixed between the drive side frame 16 and the operation side frame 17. A radial bearing is used as the bearing 13 to support the load of the plate cylinder 11 in the rotational direction.
Since the axial direction of 1 is not restricted, the plate cylinder 11 can also be moved in the axial direction.

As described above, in the present embodiment, by supporting the non-printing portion in the middle portion of the 1x plate cylinder 7 having the perimeter of one page and the width of four pages by the intermediate bearing 13, the normal printing is performed. The rigidity can be secured.

FIG. 6 is a diagram showing various other embodiments of the present invention. The same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6 (a), in this embodiment, in the concave portions 11e formed at the opposite ends of the non-printing portions of the driving side plate cylinder 11a and the operating side plate cylinder 11b, respectively, the plate is formed. Torso 1
In this embodiment, the intermediate portion of No. 1 is supported by the intermediate bearing 13. Since the non-printing portions of the driving-side plate cylinder 1a and the operating-side plate cylinder 1b are rotatably supported by the intermediate bearing 13, the rigidity necessary for the 1-time plate cylinder 7 having the perimeter of one page and the width of four pages can be obtained.

As shown in FIG. 6B, in this embodiment, the drive side plate cylinder 11a and the operation side plate cylinder 11b are the operation side frame 1.
6 is an embodiment in which the plate cylinder supporting member 8 supported between the plate 6 and the drive side frame 7 is pivotally supported. The drive side plate cylinder 11a is pivotally supported by an intermediate bearing 13 of the plate cylinder 11 and an end bearing 13a. Is
The operation side plate cylinder 11b is pivotally supported by the intermediate bearing 13 and the end bearing 13b.

Since the plate cylinder support member 18 on which the driving side plate cylinder 11a and the operating side plate cylinder 11b are mounted is pivotally supported by the intermediate bearing 13, it is necessary for the 1 × plate cylinder 7 having a perimeter of one page and a width of four pages. Rigidity can be obtained.

As shown in FIG. 6 (c), this embodiment is an embodiment in which the core portion 11c of the first embodiment is shortened, and the core portion 11c of the driving side plate cylinder 11a is hollow in the operating side plate cylinder 11b. It has a double structure that fits in the cylindrical part while extending part way. By supporting the core portion 11c by the intermediate bearing 13, the rigidity required for the plate cylinder 7 having a perimeter of one page and a width of four pages can be obtained. Further, by shortening the core portion 11c of the driving side plate cylinder 11a, there is an advantage that the processing is easy and the cost is low.

In this embodiment, as shown in FIG. 6D, a plate cylinder 7 having an undivided one-page perimeter and a four-page width is provided on the circumference of the non-printing part in the middle part of the plate cylinder 7. A circumferential groove 11d is formed so that the intermediate bearing 13 axially supports the intermediate portion of the plate cylinder 7. In this embodiment, the non-divided 1-page perimeter and 4-page width 1 × plate cylinder 1 and the intermediate bearing 3 pivotally support the required rigidity with a simple structure.

[0055]

According to the present invention, by setting the position of the reference notch or the like for taking the reference position of the printing plate itself as close to the end face of the plate cylinder as possible, the adjustment device itself It can be simplified. That is, the length of the adjusting member for supporting the register pin that can move in the axial direction can be short. This eliminates the need to consider the strength of the adjusting member, so that a plate-shaped adjusting member can be formed that matches the width of the slit groove for mounting the printing plate.
In addition, it is not necessary to process the inside of the groove, and there is no need to make a complicated structure, so it is possible to install even on a 1x plate cylinder with 1 page perimeter and 4 page width that does not have the space to install another device. Become.

Further, in the case of a conventional plate having a length of 1 page and a width of 2 pages, out of the notches for the positioning reference at four locations, two useless notches that do not serve as the reference are generated. In the case of a notch or a system which is the standard of the printing plate in the invention, it is possible to use all four positions as a standard, and it is close to the end face of the plate cylinder even if it is attached to either the operating side or the drive side of the plate cylinder. Effective register adjustment is possible at only one place. Of course, it is possible to use not only the 1 × cylinder but also the 2 × cylinder.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a process of forming a printing plate according to the present invention.

FIG. 2A is a perspective view of an adjusting rod used in the present invention,
(B) is a diagram showing a state in which the printing plate of the present invention is mounted on a plate cylinder.

FIG. 3 is a diagram showing another embodiment of the process of forming the printing plate of the present invention.

FIG. 4 is a perspective view of an adjusting rod used in the present invention, and FIG. 4 (b) is a view showing a state in which the printing plate of the present invention is mounted on a plate cylinder.

FIG. 5 is a diagram showing an embodiment of a plate cylinder having a perimeter of one page and a width of four pages used in the present invention.

FIG. 6 is a view showing another embodiment of a plate cylinder having a perimeter of one page and a width of four pages used in the present invention.

FIG. 7 is a diagram showing a process of forming a conventional printing plate.

FIG. 8 is a diagram showing a state in which a conventional printing plate is mounted on a plate cylinder.

[Explanation of symbols]

1: Plate 2: Locking notch 2a: ○ -shaped positioning hole 2b: □ -shaped positioning hole 2c: Reference notch 2d: Plate positioning notch 3: Negative film 4: Positioning hole 5 : Plate pin 6: Adjustment bar 6
a: Locking protrusion 6b: Screw 6c: Contact surface 7: Plate cylinder
7a: Slit groove 8: Handle 9: Notch 10a, 1
0b: Register pin (positioning block) 11a:
Drive side plate cylinder 11b: Operation side plate cylinder 11c: Core part 11
d: circumferential groove 11e: recess 12: blanket cylinder 1
3: Intermediate bearing 13a, 13b: Bearing 14: Bearing blanket 15: Frame stay 16: Operation side frame 16a: Bearing 17: Drive side frame 17a:
Bearing 18: Plate cylinder support member

Claims (7)

[Claims] 1. A newspaper offset rotary press is mounted in a slit groove formed in an axial direction on a plate cylinder having a perimeter of one page and a width of four pages, and a notch is provided at a position near a side edge of a printing plate. A plate provided and an adjusting rod for register adjustment, which is arranged in the slit groove so as to be movable in the axial direction and has a locking projection at a tip portion that locks in the notch of the plate at a reference position. A newspaper offset press featuring the features. 2. A printing plate in which a newspaper offset rotary press is mounted in a slit groove formed in the axial direction in a plate cylinder having a perimeter of one page and a width of four pages, and notches are provided at four corners of the plate. A newspaper offset rotary press, comprising: an adjusting rod arranged in the slit groove so as to be movable in the axial direction and having a contact surface with which a notch of the printing plate abuts at a reference position. . 3. The plate cylinder is a 1 × plate cylinder having a perimeter of one page and a width of four pages, and a non-printing portion in the middle of the plate cylinder is pivotally supported by an intermediate bearing. The newspaper offset press described. 4. A plate cylinder comprising a drive-side plate cylinder and an operating-side plate cylinder, and a double structure in which a core portion of one plate cylinder extends into and fits into a hollow cylindrical portion of the other plate cylinder. The newspaper offset rotary press according to claim 1 or 2, wherein the core portion of the intermediate portion is axially supported by an intermediate bearing. 5. The plate cylinder is pivotally supported by an intermediate bearing in recesses formed at opposite ends of the non-printing portions of the drive-side plate cylinder and the operating-side plate cylinder, respectively. The newspaper offset rotary press of paragraph 1 or 2. 6. The plate cylinder is supported by a plate cylinder support member in which the drive side plate cylinder and the operation side plate cylinder are supported between the operation side frame and the drive side frame, and the plate cylinder support member is a shaft by an intermediate bearing. The newspaper offset rotary press according to claim 1 or 2, which is supported. 7. The plate cylinder comprises one non-divided plate cylinder,
The newspaper offset rotary press according to claim 1 or 2, wherein the newspaper offset rotary press is axially supported by an intermediate bearing in a circumferential groove formed in the circumference of the non-printing portion in the middle portion of the plate cylinder.