JPH03108543A - Rotary press - Google Patents

Abstract

PURPOSE:To facilitate the registration of a plate by a method wherein a pinion engaging with a rack or a gear and a servo motor are provided on a shaft of a blanket cylinder, and an orbit for moving the blanket cylinder in forward and reverse printing directions is formed. CONSTITUTION:A rack 5 or gear having a tooth train in a forward paper feed direction is provided. A pinion 6 engaging with the rack 5 or gear with its axis in coincidence with the axis of a plate cylinder 1 and a servo motor 7 mounted on the side face of the pinion 6 for rotating the plate cylinder 1 independently are provided. A travel means is provided; this utilizes a second servo motor 8 which is directly connected to a pinion shaft for rotating the pinion 6 and moving the plate cylinder 1 in forward or reverse paper feed direction or a servo motor 8 which rotates the pinion 6 and moves the plate cylinder 1 along the tooth train of the rack 5 or gear in forward or reverse paper feed direction, a cylinder 13, a cam, a crank, or the like. In this manner, the registration of a plate can be conducted accurately, rapidly, and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary printing press that incorporates a new printing method in various types of rotary printing that perform continuous printing or intermittent printing.

(Prior art) There are two types of rotary printing: those in which the printing material (hereinafter simply referred to as paper to represent various printing materials) is continuously fed, and those in which it is fed intermittently. Suitable for printing, the printing presses are large and mainly used by large-scale companies. As shown in Figure 6, the printing press is a blanket cylinder (hereinafter referred to as "blanket cylinder") that transfers images from a plurality of plate cylinders or plate cylinders on the circumference of a large-diameter impression cylinder, as shown in Figure 6. To avoid complexity, there are two types in which a plate cylinder (hereinafter referred to simply as a plate cylinder) is arranged and the paper advances along the outer periphery of the impression cylinder, and another type in which a plate cylinder and an impression cylinder are arranged in a pair above and below, as shown in Fig. 7. There is a type in which the paper is placed in parallel at multiple locations on a straight line, and the paper is continuously moved in a straight line for printing.On the other hand, the type in which the paper is fed intermittently has a pair of upper and lower plate cylinders and an impression cylinder, as shown in Figure 7. The method shown in Fig. 8 is one in which printing cylinders are provided in parallel at multiple locations on a straight line, and the impression cylinder presses the paper against a plate cylinder that rotates at a fixed position when the paper that is being fed intermittently moves. As shown in FIG. 9, there is a method in which printing is performed by moving the plate cylinder over the paper while the paper is intermittently fed and stationary.

Furthermore, Japanese Patent Application Laid-open No. 16856/1983, which was invented by the present applicant, discloses a printer that can perform printing in both directions by rolling the plate cylinder back and forth in the direction in which the paper travels when the intermittent feeding of paper stops.

(Problem to be solved by the invention) In the case of continuous printing, the entire circumference of the plate cylinder is used as a plate, so a plate cylinder with a circumferential length that matches the size of the printing plate is used for each size of the printing plate. There is a problem in that it is necessary to prepare a large number of plate cylinders for each printing plate, and the plate cylinders are expensive.On the other hand, with the intermittent feeding method, the circumference of the plate cylinder does not have to match the size of the printing plate. Although there is no need to prepare a large number of plate cylinders, it is difficult to align the plates, and before printing can be performed normally, the machine must be stopped and the printing plate pasted on the plate cylinder must be repositioned to adjust its position. It is necessary to adjust the printing start position and repeat the trial many times, and in a method that prints while the paper is moved intermittently, the printing plate separates from the paper at the start and end of printing. In order to achieve this condition, it is necessary to leave a small margin of paper before and after printing, and this margin becomes the printing interval, which causes the interval to be too wide.
It is necessary to pull back the paper by the amount of space that is too wide each time,
It takes a lot of effort to adjust the movement of the plate cylinder and the timing of paper feed, and there is a lot of wasted time and wasted paper in preparatory work such as plate alignment and timing alignment before normal printing starts. The drawback is that the effective operating rate usually drops to about 50% due to the time required for such preparatory work, making it extremely uneconomical.

For this reason, small loft prints require large preparation costs, which increases the printing cost and makes the prints more expensive.At the same time, the profits of printers are also reduced.

This time-consuming preparation work is particularly problematic in high-mix, small-loft printing, and this has been a problem in the industry for many years.
No. 16856 also aims to solve this problem, but in this case too manual adjustment was required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the various conventional problems described above and to provide a rotary printing press that can perform continuous or intermittent rotary printing extremely accurately, quickly, and easily.

(Means for Solving the Problems) To achieve the above object, the present invention provides a rotary printing press that performs continuous printing or intermittent printing, in which a rack or gear having teeth in the direction of paper advance is provided, and a plate cylinder a pinion that meshes with the rack or gear, with its axis aligned with the axis of the rack or gear, and attached to the side of the pinion;
A second servo motor is provided that rotates the plate cylinder independently, and a second servo motor that is directly connected to the pinion shaft rotates the pinion to move the plate cylinder in the paper advancing direction or in the opposite direction. Movement using a servo motor, cylinder, cam, crank, etc. that rotates the pinion and moves the plate cylinder in the direction in which the paper advances or in the opposite direction along the tooth row of the rack or gear. It is a rotary printing press equipped with means.

The above plate cylinder is equipped with an inking roller device, and the pinion, servo motor, and moving means provided on the plate cylinder constitute a printing unit.In the case of multicolor printing, this printing unit is used. Multicolor printing is performed by arranging the required number of colors in the paper traveling direction and winding the printing plates for each color around the respective plate cylinders.

(Function) The servo motor is driven to rotate the plate cylinder and perform inking and printing start positioning.

Next, printing begins, and in conventional continuous printing, where the entire circumference of the plate cylinder is a printing plate, a servo motor continuously rotates the plate cylinder in a fixed position in synchronization with the speed of paper movement. conduct.

In the present invention, continuous printing is possible even when the entire circumference of the plate cylinder is not filled with printing plates but only a portion of the circumference is covered with printing plates. In other words, printing is performed by operating a moving means to move the plate cylinder in the opposite direction of the paper moving at a constant speed, and using a servo motor to rotate the plate cylinder by the rotation angle necessary for printing in synchronization with the progress of the printing material. Immediately after that, the moving means is operated in the opposite direction (the direction in which the paper advances) to quickly move the plate cylinder by the required distance in the printed direction, and during this movement, the plate cylinder is continuously rotated to print the print. When the printing is completed and the printing start position of the plate cylinder coincides with the next printing start position, the next printing is performed in the same manner as described above, and continuous printing is performed by sequentially repeating this operation.

In this way, it is possible to perform continuous printing by attaching the printing plate to only a part of the outer periphery of the plate cylinder, which was previously impossible, without having to prepare multiple plate cylinders for each size of the conventional printing plate. One plate cylinder can be used for many types of printing plates of different sizes, allowing economical continuous printing.

Next, in the case of intermittent printing in which printing is performed while the paper is being moved intermittently, the paper begins to move and the plate cylinder At the same time as printing starts while being rotated by a servo motor,
Printing is performed while moving the plate cylinder in a direction opposite to the direction in which the paper travels, and when printing is completed, the moving means is operated in the opposite direction, that is, in the direction in which the paper travels, to return the plate cylinder to its original position.
During this return, the plate cylinder continues to rotate and inking is completed, and after exactly one rotation from the start of printing, the printing start position of the plate cylinder is
When the printing is completed and the position coincides with the next printing start position on the stopped paper, the paper starts moving in the same way as described above and the next printing is performed, and this operation is sequentially repeated to perform intermittent printing.

By doing this, the print end position and the next print start position can be made to almost match, so there is no need to pull back the paper every time as in the conventional method, and printing becomes easier.

Additionally, in the case of intermittent printing, in which the plate cylinder transfers over the paper when the paper stops moving intermittently, the plate cylinder is moved the required distance by a moving means, and the pinion is rolled along the rack or gear. The servo motor fixed to the pinion and the plate cylinder whose shaft is directly connected to the servo motor roll together to perform printing. Thus, after printing is completed, the moving means is operated in the opposite direction to return the plate cylinder to its original position, and at the same time, while the plate cylinder is returning, the servo motor rotates the plate cylinder to align the inking and printing positions of the plate cylinder. The next printing is started in the same manner as above when the printing start position of the printing cylinder coincides with the next printing starting position of the paper that moved by one printing and stopped during the printing cylinder return, Intermittent printing is performed repeatedly in sequence.

The above describes continuous printing when the entire circumference of the plate cylinder is a printing cylinder, continuous printing when only a part of the plate cylinder has a printing plate, which was previously impossible, and printing when paper moves intermittently. We have explained four types of printing methods: intermittent printing and intermittent printing when paper that moves intermittently is stopped. Taking advantage of the fact that it is possible to control the motors individually and select rotation or non-rotation, rotating only the plate cylinder to print while not printing on the other plate cylinders, For example, when printing labels, the first label is printed in blue, the second in yellow, and the third in red. This enables special printing that was previously considered impossible. (Example) The present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 is a diagram showing an example of a plate cylinder. On the axis of the plate cylinder (1), there is a pinion (6) that meshes with a rack (5) having a tooth row in the direction in which the printing material travels, and this pinion (6). ) and a second servo motor (7) as a means of movement.
A servo motor (8) is installed, and both ends of the servo motor (8) are connected to rails (9) (
9a) supporting member (10) (1
The second servo motor (8) is attached to a support member (10), and one support member (10a) rotatably supports one end of the shaft of the plate cylinder (1). .

The axial relationship is as shown in a partial cross section in Fig. 2.
1) and the shaft of the servo motor (7) are directly connected, and the shaft of the pinion (6) and the shaft of the second servo motor (8) are also directly connected.

FIG. 3 is a diagram showing a state similar to FIG. 1 when using the Planke gutter cylinder (2) for offset printing,
The blanket cylinder (2) is arranged in parallel with the outer periphery of the plate cylinder (1), and gears (3) and (4) with the same number of teeth are attached to one end of the plate cylinder (1) and the blanket cylinder (2), respectively. are engaged with each other, and the first
Similar to the plate cylinder (1) in the figure, a binion (6), a servo motor (7), and a second servo motor (8) are provided, and both ends thereof are supported by supports (10) (10a). The rotation of the blanket cylinder (2) causes the plate cylinder (1
) is transferred to the blanket cylinder (2), and this blanket cylinder (2) contacts the paper to print.

(11) is a roller with ink, which is installed parallel to the plate cylinder (1), and is located between the plate cylinder (1) and the ink roller (12) as shown in Fig. The outer periphery should be brought into contact with the ink roller (11) as shown in the phantom line after contacting the ink roller (12) and depositing ink on the outer periphery as shown by the solid line. The printing plate (1a) is made by bringing the plate into contact with the plate cylinder (1) and rotating the plate cylinder (1) by a predetermined rotation angle in the direction of the arrow by the servo motor (7) as shown in FIG.
Add ink to. Then, by rotating the plate cylinder in the opposite direction by the same rotation angle, the printing plate (1a) returns to its old position.

Multiple ink rollers (12) (3 in Figure 10)
The ink rollers (12) are rotated in order with their outer circumferences in contact with each other, and the ink is transferred from the upper ink roller to the lower ink roller in order, and then from the bottom ink roller (12) to the ink-containing roller (
11) to which the ink is transferred. In this way, the ink roller (
By transferring the ink to step 11), the ink can be applied uniformly to the entire circumference.

When using the second servo motor as a moving means as shown in FIGS. 1 to 3 explained above, the second servo motor (8) and servo motor (7) must be controlled using a computer (not shown). For example, various types of printing can be performed accurately, quickly, and easily.

Figures 4 and 5 show an example in which a cylinder (13) operated by air or hydraulic pressure is used as another means of movement in place of the second servo motor in Figure 1, and is perpendicular to the pinion shaft (6a). Insert the cylinder (13
), the tip of the cylinder iron (13a) is rotatably fitted loosely into the pinion shaft (6a), and the cylinder iron (13a) is reciprocated. ) along the rack (5) while rotating the plate cylinder (
1) is rotated via a servo motor (7).

In addition to this, a moving means using a cam, a crank, etc. is also conceivable, but illustration and description thereof will be omitted.

Next, Figures 6 to 9 are diagrams showing four types of conventional rotary printing methods, and Figure 6 shows a plurality of plate cylinders (1) on the circumference of a large-diameter impression cylinder (16). Fig. 7 shows a continuous printing method in which the printing plate (15) wraps around the outer periphery of the large-diameter impression cylinder (16), and the print cylinder (15) wraps around the outer periphery of the large-diameter impression cylinder (16). A continuous printing method is shown in which an impression cylinder (17) is provided for each plate cylinder (1) and an impression cylinder (17), and a paper roll (15) is pulled by a paper feed roller (18) and continuously moves straight between the plate cylinder (1) and the impression cylinder (17), 8th
The figure shows a plurality of sets of plate cylinders (1) and impression cylinders (17) arranged in parallel as in Fig. 7, and a paper (15) that is pulled by a paper feed roller (18) and moves straight. , moves intermittently only when printing, and during the movement, the impression cylinder (17) presses the paper (15) against the plate cylinder (1) and prints, and every - times printing, the retraction roller ( 19) shows an intermittent printing method in which printing is performed by pulling back and printing, and FIG. 9 shows each refraction section of the gill (15) that is bent and advances along a plurality of guide rollers (20) whose heights are changed. A plurality of arranged plate cylinders (1) are moved intermittently to a receiving plate (15).
This shows an intermittent printing method in which the paper rolls and prints on this paper (15) while the paper is stopped on the paper (21). In this case, when the paper (15) is bent and advanced, the guide roller (
There is an advantage that the meandering of the gill (15) can be adjusted by adjusting the inclination of the gill (15).

As shown in FIGS. 1 to 5, the plate cylinder of a rotary printing press that performs the rotary printing method shown in FIGS. 6 to 9 is equipped with a pinion (6), a servo motor (7), and a moving means. Second
In addition to attaching a servo motor (8) or a cylinder (13), etc., in the case of Fig. 6, the shaft center is aligned with the large diameter impression cylinder (16), and a cylinder with a diameter close to that of the large diameter impression cylinder (16) is installed. A large-diameter gear (not shown) is provided to mesh with the pinion (6), and in FIGS. The one that meshes with the pinion (6) is shown in Fig. 9.
A method of printing by rolling the plate cylinder (1) when the intermittent moving paper (15) is stopped will be specifically explained.

As shown in Figure 1O, the printing plate (1a) is inked by the ink roller (11), and the plate cylinder (1) is moved to the printing start position shown at position A by driving the servo motor (7). Match. Next, the moving means (here, the second servo motor (8)) is driven to move the pinion (6).
Via the servo motor (7) attached to the
This servo motor (7) and the plate cylinder (
The printing plate (1a) is created by moving the plate (1) on the girder (15) through the B position to the printing end position of C.
is transferred onto paper (15) and printing is performed. At this time, the support members (10) (10a) at both ends are connected to the rails (9) (9a).
At position C after printing, where the ink roller (11) and ink roller (12) are moved as a guide, the ink roller (11) and ink roller (12) are moved to the position shown in the imaginary line in Fig. 10, and as the plate cylinder (1) moves, the fulcrum (14) is moved. The center position is changed and ink is applied to the printing plate (1a) by driving the servo motor (7) in the same manner as described above. During this ink application, the girder (15) is moved by a predetermined distance in preparation for the next printing, and the plate cylinder (1) is reversely transferred from the C position to the B position to the A position on the girder (15). Printing is also performed on the return trip.

In this way, when the plate cylinder (1) rolls from the A position to the C position and from the C position to the A position by the second servo motor (8) (moving means), the plate cylinder (1) is moved by the servo motor (7).
Therefore, if the plate cylinder (1) is rotated in the opposite direction to the rotation speed at the same rotational speed as the rotation speed, a state is obtained in which the plate cylinder (1) moves but does not rotate and therefore no printing is performed.

A servo motor (7) controls the rotation and non-rotation of this plate cylinder (1).
By being able to freely control the printing speed, it becomes possible to perform special printing, which was previously considered impossible, as described in the section of the above-mentioned operation.

Next, a new printing method that does not require pulling back the overrun paper in the printing method shown in FIG. 8 in which printing is performed while the paper is moving intermittently will be explained by comparing the conventional method and the present invention based on FIG. 12.

In Fig. 12, (1) indicates the state at the start of printing (■) indicates the state at the time of completion of printing, and (I[[) indicates the state at the start of the next printing. Since the printing plate (1a) needs to be completely separated from the girder (15), the front end (a) of the planned printing position at the start of printing in (1)
) is a distance (S+) behind the position where printing actually starts, and the trailing edge (b') of the completed printing at the end of printing in (II) is a distance (S2) from the position where printing is actually completed.
Therefore, a blank space of (St+Sz) will occur between printings. In order to eliminate this blank space, in the conventional method, each print
) was pulled back by the pullback roller (19) in Figure 8 by a distance of approximately (SI+St), bringing point b' closer to point a, as shown in the state at the start of the next printing in (II[). be.

In this regard, in the case of the present invention, the plate cylinder (1) is moved to the impression cylinder (17) during printing.
) in the opposite direction of the paper (15) using a moving means such as a second servo motor (8) or a cylinder (13) to apply ink to the printing plate (1a) after printing of (II) is completed. When the print cylinder (1) completes one rotation and returns to the original printing start position, the paper is returned to its original position by the amount of movement in the reverse direction, and the leading edge (a) of the next scheduled printing position is moved. is brought closer to the trailing edge (b') of completed printing. In this case, the rotation of the servo motor (7) is adjusted to prevent the circumferential speed of the printing plate (1a) from changing due to the movement of the plate cylinder (1) during printing and becoming inconsistent with the moving speed of the paper. It is controlled to make them match.

According to the method of the present invention shown in FIG. 12, there is no need to pull back the paper (15) during intermittent printing.
15) is also eliminated. In this case, it will be the same as the linear continuous printing shown in Figure 7, and the printing plate (
1a) is not attached to the outer periphery of the plate cylinder (1) and has the printing plate (1a) only on a part of the outer periphery.
Continuous printing is possible by skillfully utilizing the movement of 1), and this also applies to the large-diameter impression cylinder type continuous printing method shown in FIG.

Therefore, if the method of the present invention shown in FIG. 12 is utilized, there is no need to prepare many plate cylinders (1) with different diameters in order to match the circumference length to printing plates (1a) of various sizes in continuous printing, and only one plate cylinder (1a) is used. This plate cylinder can be adapted to print plates of various sizes.

According to the above configuration, by assigning finely (for example, 1/100 mm) land numbers on the track formed by the rack (5) or gear and pinion (6), the servo motor can be controlled using a computer or controller. (7
) and the second servo motor (8) (moving means), accurate plate alignment can be quickly performed and various types of rotary printing can be easily performed.

(Effects of the Invention) According to the rotary printing press according to the present invention described above, a pinion that meshes with a rack or gear and a servo motor are provided on the axis of the plate cylinder or blanket cylinder, and a rack or gear that meshes with the pinion is provided. By forming a track for moving the plate cylinder or the blanket cylinder in the forward and reverse directions of the printing progress direction, and providing a moving means for moving the plate cylinder or the blanket cylinder in the forward and reverse directions along this track, 4. By skillfully combining this movement with the forward and reverse rotation of the plate cylinder or blanket cylinder by a servo motor,
Allocating print positions, which used to be time-consuming and troublesome,
In other words, plate matching can be done extremely easily,
Therefore, the preparatory work time is shortened, and the efficiency of high-mix, small-lot printing can be improved and advantageously carried out. In intermittent printing, there is no need to pull back the printing material after each printing, and part of the plate cylinder is Since it is possible to perform continuous printing by pasting only printing plates, it is no longer necessary to prepare many plate cylinders with different diameters in order to match the size of the printing plates in continuous printing, and it is possible to perform continuous printing economically. is obtained.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a plate cylinder in which a pinion, a servo motor, and another servo motor as a moving means are arranged on the axis of the plate cylinder, and Fig. 2 is a cross section of a part of Fig. 1. Figure 3 is a side view showing an example in which a pinion, a servo motor, and another servo motor serving as a moving means are arranged on the blanket cylinder in the same manner as in Figure 1, and Figure 4 is a side view of the blanket cylinder. FIG. 5 is a plan view showing an example in which a cylinder is used instead of the servo motor as the moving means shown in the figure. FIG. 5 is a view of FIG.
Figure 6 shows an overview of a large-diameter impression cylinder type continuous rotary printing method. Figure 7 shows an overview of a linear type continuous rotary printing method. Figure 8 shows an overview of a linear continuous rotary printing method. Figure 9 shows an overview of an intermittent printing method that prints when the printing medium is stationary. Figure 10 shows an overview of an intermittent printing method that prints when the printing medium is stationary. Figure 11 is a diagram illustrating a state in which printing is performed. Figure 11 is a diagram illustrating a state in which ink is applied to a printing plate on a plate cylinder. Figure 12 is a conventional intermittent printing method in which the substrate is pulled back after each printing. FIG. 3 is a diagram showing a comparison between this method and a printing method of the present invention which is an alternative to this method. ■... Plate cylinder 1a... Printing plate 2... Blanket cylinder 5... Rack 6... Pinion 7... Servo motor 8... Second servo motor (moving means) 13... Cylinder (moving means ) Figure 1O Figure 3 = L, -ii Invention method Figure 12 Conventional method

Claims (1)

[Scope of Claims] In a rotary printing press that performs continuous printing or intermittent printing, a rack or gear is provided that has teeth in the advancing direction of the printing material, and the axis is aligned with the axis of the plate cylinder or blanket cylinder. and the pinion that meshes with the rack or gear,
A servo motor is attached to the side of the pinion and rotates the plate cylinder or blanket cylinder independently, and the pinion is rotated to rotate the plate cylinder or blanket cylinder in the direction in which the printing material is traveling or in the opposite direction. A rotary printing press characterized by being provided with a moving means for moving in the advancing direction.