JP3554303B2 - Plate cylinder of newspaper offset rotary press - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plate cylinder for mounting a printing plate, which is arranged in a printing section of a newspaper offset rotary press.
[0002]
[Prior art]
Generally, a plate cylinder in a newspaper offset rotary press is a cylinder for mounting a printing plate, and is equipped with a mechanism for fixing the printing plate in a fixed position. In addition, the ink comes in contact with an ink setting roller, a water setting roller, etc., receives the ink and the dampening solution on the plate surface, transfers the ink to a blanket cylinder equipped with a rubber blanket, and prints by passing the traveling paper.
[0003]
The size of the printing plate used for newspaper printing is 2 page length × 2 page width (2L2W), 2 page length × 1 page width (2L1W), 1 page length × 1 page width (1L1W). Many page lengths are used. The plate cylinder in this newspaper offset rotary press is usually a two-page cylinder and a four-page width, and is called a double plate cylinder, which is well known (hereinafter, referred to as a "double cylinder"). Incidentally, the double cylinder is usually used by mounting two printing plates having a length of two pages and a width of two pages.
[0004]
FIG. 4 shows a conventional double body having a divided structure (shell structure) as a means for register adjustment. The divided structure includes a drive-side plate cylinder 1a and an operation-side plate cylinder 1b, each of which is provided with a register adjustment device 9 in the top-to-bottom direction (circumferential direction) and in the left-right direction. The main purpose is to correct the misregistration at the time of printing for the reason of the divided structure. The causes of the misregistration are various, such as changes in various conditions at the time of printing, errors in plate making, errors in machine production, and errors in plate mounting. Of course, register registration can be adjusted to some extent by moving the plate cylinder to the top and bottom and right and left without using a divided structure. However, in view of the trend toward multi-color printing in recent years, as one means for performing more accurate register adjustment, a form in which the divided left and right plate cylinders are separately adjusted is adopted. Furthermore, regarding this register adjustment, the operator conventionally visually judges the amount of print registration deviation, and corrects the misalignment of the plate cylinder in the top and bottom direction and the left and right direction with the operation button. There is also an automatic register adjustment device for reading register marks printed on a web and automatically performing top and bottom left and right register adjustments in accordance with the amount of register deviation based on the register marks, which are well known.
[0005]
This is the reason why the plate cylinder is doubled in a normal offset rotary press. However, the press cylinder of the rotary press is in contact with a blanket cylinder or a rubber roller during operation, and a strong transfer pressure for transfer by these is used. This is because, in order to perform high-speed rotation while being pressed by the pressure and perform normal printing in the rotation, the rigidity of the plate cylinder itself that can withstand them is required.
[0006]
[Problems to be solved by the invention]
However, when the cylinder is doubled, the rotary press itself becomes large due to its large diameter, and the rotary press itself for performing multicolor printing tends to be a tower unit. Is difficult.
[0007]
In addition, if the cylinder is doubled, the printing plate must be two pages long, and there is a problem in the production of the plate cylinder that the cost such as the material cost and the man-hour for processing the same increases. . Further, since the double body increases the machine weight, the power consumption for driving the double body is not ridiculous.
[0008]
In order to solve the above-mentioned problem, it is possible to reduce the diameter of the plate cylinder to half the diameter of the double cylinder by using a plate cylinder having a circumference of one page and a width of four pages (hereinafter, referred to as a "one cylinder"). Conceivable. However, making the diameter twice as large as that of the double cylinder means that the plate cylinder of a rotary press comes into contact with a blanket cylinder or rubber roller during operation and rotates at a high speed while being pressed by a strong force. In addition to the rigidity of the plate cylinder itself for performing normal printing in the medium, a phenomenon such as the plate cylinder body being bent (warped) occurs, and it is difficult to obtain a stable transfer pressure. In particular, in the case of a divided structure for register adjustment as employed in a conventional double cylinder, the structure of the plate cylinder main body becomes brittle, so that the phenomenon (bending, etc.) is further remarkable. It becomes something.
[0009]
Further, in addition to the bending of the plate cylinder main body, a mechanism portion for mounting the plate and blanket of the plate cylinder and the blanket cylinder, that is, a so-called non-printing area (gap) faces each other, and a phenomenon that occurs when the transfer pressure is temporarily released ( Jumping), and further increases the instability of the transfer pressure. Eventually, the possibility of damage to the plate cylinder itself must be introduced.
[0010]
Accordingly, the present invention solves the problems of the single-printing cylinder, and makes it possible to apply a single-page cylinder having a one-page circumferential length and a four-page width to the plate cylinder of a rotary press. The present invention provides a plate cylinder of a newspaper offset rotary press capable of reducing the size and space of the press.
[0011]
[Means for Solving the Problems]
Plate cylinder of the present invention, the plate cylinder is 1 times plate cylinder 4 page width per page circumference, the plate cylinder of a newspaper offset rotary press unprinted portion of the intermediate portion of the plate cylinder are pivotally supported by the intermediate bearing (1) The plate cylinder comprises a drive-side plate cylinder and an operation-side plate cylinder, and a core portion of one of the plate cylinders has a double structure extending and fitted into the hollow cylindrical portion of the other plate cylinder, (2) a concave portion formed at the opposite end of each of the non-printing portions of the drive-side plate cylinder and the operation-side plate cylinder, wherein the core portion of the intermediate portion of the plate cylinder is supported by an intermediate bearing; (3) The plate cylinder is composed of a drive-side plate cylinder and an operation-side plate cylinder, and an operation-side frame and a drive-side frame. And (4) the plate cylinder is composed of one undivided plate cylinder, and the plate cylinder is supported by a plate cylinder support member supported between the plate cylinder and the plate cylinder. And is supported by an intermediate bearing in a circumferential groove formed on the circumference of the non-printing portion of the intermediate portion.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, the plate cylinder has a non-printing area (non-printing area) by adopting the above configuration, and the present invention uses an intermediate non-printing portion of the plate cylinder to support the plate cylinder with an intermediate bearing. Rigidity and flexure that cannot be obtained only with a plate cylinder having a one-page circumferential length and a four-page width can be supplemented.
[0014]
The plate cylinder is provided with a plate clamping mechanism for attaching a printing plate and a register adjusting device for finely adjusting the top, bottom, left and right registrations, similarly to the conventional plate cylinder. The register adjusting device may be either manual or automatic.
[0015]
【Example】
Example 1
FIG. 1 is a view showing one embodiment of a plate cylinder according to the present invention.
[0016]
The plate cylinder 1 of the printing unit of the rotary press includes a drive-side plate cylinder 1a and an operation-side plate cylinder 1b. Each of the plate cylinders 1a and 1b has a circumference of one page, each having a width of two pages, and a circumference of four pages. It is formed on a 1-page width cylinder.
[0017]
A core portion 1c of the drive-side plate cylinder 1a has a double structure in which the core portion 1c extends and fits into the hollow cylindrical portion of the operation-side plate cylinder 1b. The core portion 1c can be provided on one of the plate cylinders, and the other can be provided with a hollow cylindrical portion. The respective ends of the drive-side plate cylinder 1a and the operation-side plate cylinder 1b are pivotally attached to bearings 6a, 7a of the drive-side frame 6 and the operation-side frame 7, respectively, to adjust registration in the top-to-bottom (circumferential) direction and the left-right direction. Equipped with a register adjustment mechanism that can be performed separately. The blanket cylinder 2 is in contact with the plate cylinder 1.
[0018]
A circumferential groove 1d is formed between the ends of the non-printing portions where the drive-side plate cylinder 1a and the operation-side plate cylinder 1b face each other, and extends in the circumferential direction to the core portion 1c. 1 c is supported by the intermediate bearing 3. The intermediate bearing 3 is supported by a bearing blanket 4 of a frame stay 5 fixed between the drive side frame 6 and the operation side frame 7. A radial bearing is used as the bearing 3 to support the load in the rotational direction of the plate cylinder 1, but the axial direction of the plate cylinder 1 is not restricted, so that the axial movement of the plate cylinder 1 can be performed.
[0019]
As described above, in the present embodiment, the rigidity for normal printing is ensured by supporting the non-printing portion of the intermediate portion of the single-printing cylinder 1 having a one-page circumferential length and a four-page width by the intermediate bearing 3. can do.
[0020]
Example 2
FIG. 2 is a diagram showing various other embodiments of the present invention. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
[0021]
As shown in FIG. 2A, in the present embodiment, in the concave portion 1e formed at the opposite end of each of the non-printing portions of the driving-side plate cylinder 1a and the operation-side plate cylinder 1b, This is an embodiment in which an intermediate portion is structured to be supported by an intermediate bearing 3. Since the non-printing portions of the drive-side plate cylinder 1a and the operation-side plate cylinder 1b are supported by the intermediate bearing 3, rigidity required for the single-plate cylinder 1 having a one-page circumferential length and a four-page width can be obtained.
[0022]
Example 3
In this embodiment, as shown in FIG. 2B, the drive-side plate cylinder 1a and the operation-side plate cylinder 1b are supported by a plate cylinder support member 8 which is supported between the operation-side frame 6 and the drive-side frame 7. In this embodiment, the drive-side plate cylinder 1a is supported by the intermediate bearing 3 and the end bearing 3a of the plate cylinder 1, and the operation-side plate cylinder 1b is supported by the intermediate bearing 3 and the end bearing 3b. Is done.
[0023]
Since the plate cylinder support member 8 on which the drive-side plate cylinder 1a and the operation-side plate cylinder 1b are mounted is supported by the intermediate bearing 3, the rigidity required for the single-plate cylinder 1 having a one-page circumferential length and a four-page width can be obtained. Can be
[0024]
Example 4
As shown in FIG. 2C, this embodiment is an embodiment in which the core portion 1c of the first embodiment is shortened, and the core portion 1c of the drive-side plate cylinder 1a is provided inside the hollow cylindrical portion of the operation-side plate cylinder 1b. It has a double structure that is extended halfway and fitted. By supporting the core portion 1c with the intermediate bearing 3, the rigidity required for the plate cylinder 1 having a one-page circumferential length and a four-page width can be obtained. Further, by shortening the core portion 1c of the drive-side plate cylinder 1a, there is an advantage that processing is facilitated and cost is not increased.
[0025]
Example 5
In the present embodiment, as shown in FIG. 3, a non-divided one-page circumferential length and a four-page-width plate cylinder 1 are formed, and a circumferential groove 1d is formed on the circumference of a non-printing portion in an intermediate portion of the plate cylinder 1. Further, the intermediate bearing 3 has a structure in which the intermediate portion of the plate cylinder 1 is pivotally supported. Register adjusting devices are provided at both ends of the plate cylinder 1.
[0026]
In the present embodiment, the required rigidity can be obtained with a simple structure by forming the unprinted one-page circumferential length and the four-page width single-plate cylinder 1 with the intermediate bearing 3 to support the middle.
[0027]
【The invention's effect】
According to the present invention, the number of printing plates is reduced to half that of the conventional double cylinder by using a one-page circumferential length and a four-page width, that is, a so-called single cylinder. As a result, when the number of printing plates is reduced by half, not only the plate-hanging operation but also the plate-making operation is reduced by half, and the operation is greatly reduced.
[0028]
In addition, the reduction in the diameter of the plate cylinder lowers the material cost, and further reduces the number of processing steps, thereby lowering the manufacturing cost, reducing the machine weight and reducing the power consumption required for operation. .
[0029]
Further, according to the present invention, by providing a bearing in the middle, the rigidity of the plate cylinder itself is supplemented, and a plate cylinder having a one-page circumferential length and a four-page width can be formed, and a divided structure can be obtained. Further, it is possible to reduce the size of the unit and to save space during installation.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of a plate cylinder according to the present invention.
FIG. 2 is a view showing another embodiment of a plate cylinder according to the present invention.
FIG. 3 is a view showing another embodiment of the plate cylinder according to the present invention.
FIG. 4 is an explanatory view of a conventional plate cylinder.
[Explanation of symbols]
1: plate cylinder 1a: drive-side plate cylinder 1b: operation-side plate cylinder 1c: core portion 1d: circumferential groove 1e: concave portion 2: blanket cylinder 3: intermediate bearings 3a, 3b: bearing 4: bearing blanket 5: frame stay 6 : Operation side frame 6a: bearing 7: drive side frame 7a: bearing 8: plate cylinder support member

Claims (4)

Plate cylinder is 1 times plate cylinder 4 page width per page circumference, non-printed portion of the intermediate portion of the plate cylinder is a plate cylinder of a newspaper offset rotary press, which is rotatably supported by the intermediate bearing,
The plate cylinder is composed of a drive-side plate cylinder and an operation-side plate cylinder, and the core of one plate cylinder has a double structure in which the core extends and fits into the hollow cylinder of the other plate cylinder. The plate cylinder of a newspaper offset rotary press, characterized in that the plate cylinder is supported by an intermediate bearing . A plate cylinder is a single-page cylinder having a one-page circumferential length and a four-page width, and a non-printing part in an intermediate portion of the plate cylinder is a plate cylinder of a newspaper offset rotary press supported by an intermediate bearing;
A plate for a newspaper offset rotary press, wherein the plate cylinder is supported by intermediate bearings in recesses formed at opposite ends of respective non-printing portions of the drive-side plate cylinder and the operation-side plate cylinder. Torso. A plate cylinder is a single-page cylinder having a one-page circumferential length and a four-page width, and a non-printing part in an intermediate portion of the plate cylinder is a plate cylinder of a newspaper offset rotary press supported by an intermediate bearing;
The plate cylinder is the drive-side plate cylinder and the operation-side plate cylinder is the operation-side frame and the drive-side frame. Wherein the plate cylinder support member is supported by a plate cylinder support member supported between the plate cylinder, and the plate cylinder support member is supported by an intermediate bearing . A plate cylinder is a single-page cylinder having a one-page circumferential length and a four-page width, and a non-printing part in an intermediate portion of the plate cylinder is a plate cylinder of a newspaper offset rotary press supported by an intermediate bearing;
Newspaper characterized in that the plate cylinder is composed of one undivided plate cylinder, and is supported by an intermediate bearing in a circumferential groove formed in the circumference of the non-printing portion in the middle of the plate cylinder. Plate cylinder for web offset press.

Images