JPH0380629B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides a circular-pressure offset printing press, such as a letterpress or intaglio printing press, in which a blanket cylinder is pivotally supported on a printing press body frame to be fixed and rotatable.
This invention relates to a printing machine in which a plate surface plate and a printing material surface plate are reciprocatingly movable, and a blanket cylinder can idle.

<Prior art> In general, a circular pressure printing press is a letterpress flatbed printing machine in which the impression cylinder that holds and prints a sheet as a printing medium is fixed and rotary, and the plate surface plate and printing press surface are horizontally movable types. There is a chance. The impression cylinder of this printing machine holds the printing material in its mouth and supplies it to the printing position, and prints by transferring ink directly from the printing plate to the printing material, rather than the articulation transfer method in which printing is performed via a blanket cylinder. Ta.

In addition, in conventional circular pressure printing machines, the length of the surface plate and the length required for reciprocating sliding of the surface plate are determined at least according to the diameter of the impression cylinder. The size increased according to the diameter of the impression cylinder.

In particular, in order to improve printing accuracy, it is necessary to reduce the deflection of the blanket, but in order to reduce the deflection, the diameter of the blanket must be increased. However, this increases the phase difference between the print pixel end point and the print pixel start point, and the length of the mount is required to correspond to the phase difference, resulting in an increase in the length of the printing machine.

<Object of the Invention> The present invention provides a blanket cylinder that is fixed and rotatable, a plate surface plate and a printing material surface plate that are slidably movable with respect to the blanket cylinder, and the blanket cylinder has the standard fixed at a predetermined position. When printing, it is possible to idle in the forward and reverse directions, allowing multi-purpose printing without deteriorating the printing accuracy, and also specifying the length of the printing machine and the size of the blanket cylinder regardless of the size of the plate. To provide a new printing machine that can perform printing without deteriorating printing accuracy.

<Structure of the Invention> The present invention comprises a pedestal that slides on rails provided on both sides of the main body frame, a plate surface plate and a printing material surface plate that are arranged according to instructions on the pedestal, and rack gears provided on both sides of the pedestal. A blanket cylinder is provided which is equipped with a pinion gear that meshes with the printing plate and performs printing in circumferential contact with the plate surface plate and the printing material surface plate. A printing machine characterized in that a desired length of the gear at the positions opposite to each other at the positions where both outer ends are removed can be retracted away from the pinion gear and can be returned, and the printing machine is provided with a blanket on the circumferential surface, A pedestal that moves back and forth is equipped with a blanket cylinder that is rotatably supported by the main body frame and a rack gear that meshes with a pinion gear of the cylinder, and a plate surface plate and a printing material surface plate, and the rack gears on both sides of the pedestal are Equipped with retractable rack gears that can be disengaged at the same phase position,
This printing press is characterized by allowing the blanket cylinder to idle at that position.

If the present invention is explained in detail according to the drawings, the first
The figure is a side view of the printing press of the present invention, in which a blanket cylinder 1 pivotally supported on a main body side frame 12, a plate surface plate 3 arranged in this order, a printing material surface plate 6, and a mount 9 are mounted and guided. The rail 11, the main body frame 10 that fixes the rail 11, the rack gears 17 provided on both sides of the pedestal 9, the pinion gears 18 provided on both sides of the blanket body 1 and meshing with the rack gears 17, the rack gears 17 at both front and rear ends of the pedestal 9, and the plate setting. It consists of a retraction rack gear 32 provided at an opposing position between the platen 3 and the surface plate 6 of the printing material. driving gear 1
6 meshes with a rack gear 17 and is driven by a driving motor (pulse motor) 19. Idle gear 3
4 meshes with the pinion gear 18 of the blanket body 1 and is driven by a motor 35.

An embodiment of the printing machine of the present invention will be described with reference to FIG.

A blanket 2 made of silicon or the like is attached to the circumferential surface of a blanket cylinder 1, an intaglio plate 5 is attached to a plate plate 3, and a substrate 8 to be printed, such as a glass substrate, is attached to a plate plate 6. A squeegee 24 and a doctor 25, which are moved up and down by air cylinders 22 and 23, are provided on the upper side of the plate plate 3, and further,
Air cylinders 20, 2 are installed before and after the blanket body 1.
Ink wiping rollers 13 and 14 made of urethane are provided which circumferentially encircle and retract as shown in FIG. In addition, a hot air blower 15 is installed near the side surface of the blanket cylinder.
It is intended to provide

Furthermore, an adjustment device 4 for adjusting the height and horizontal state of the plate surface plate 3, and a device 7 for adjusting the printing material surface plate 6 in the same manner are fixed to the lower surface of the pedestal 9.

FIG. 4 is a plan view of FIG. 3, in which rack gears 17 are provided on both sides of the pedestal 9 in the sliding direction.
Evacuation rack gears 32 are partially provided at positions corresponding to both the front and rear ends of the plate surface plate 3 and the printing material surface plate 6.
The retractable rack gear 3 adjacent to the rack gear 17
The sliding contact part 2 is a slide fitting type, and is moved up and down by an eccentric cam or air cylinder, etc.
The downward movement allows the blanket body 1 to be disengaged from the pinion gear 18.

In Fig. 4, squeegee 24, doctor 2
5. Frame 27 that supports the squeegee 24 and the air cylinder 22 that operates it; frame 2;
A doctor frame 29 that swings in a fitted state while being supported by a doctor frame 29, a guide rail 28 that guides the doctor frame 29, a cam follower 37 that is connected to the doctor frame 29 by a shaft and swings the frame 29, and is fitted with the cam follower 37. A fixed cylindrical cam 36, pinion gears 38 and 39 that rotate the cam follower 37, and a motor 40 that rotationally drives the pinion gear 39 are shown.

In addition, the blanket cylinder 1 is connected to the plate 3a and the printing material 6.
The mechanism for releasing the printing pressure on the blanket cylinder 1 and rotating it without removing the cylinder is carried out by installing an eccentric bearing 41 on one shaft side of the blanket cylinder 1, and repeatedly rotating it using an air cylinder 42 attached to the eccentric bearing 41. .

FIG. 4 is a front view of FIG. 3, and includes, for example, a plurality of plate surface plates 3 and printing material surface plates 6 in the printing width direction.
may be arranged.

The basic printing procedure in the above embodiment of the present invention can be described as follows: setting of printing material → inking on the plate (squeezing → doctoring) → ink transfer from the plate to the blanket → printing from the blanket to the work → printing This is done in the order in which printed materials are removed.

FIG. 5 is a control system block diagram of the printing press of the present invention, and FIG. 6 is a control system diagram of the same operating system, which is executed according to a computer program. First, the programmable sequencer is operated, and according to the program, the AC servo motor (pulse motor) 19 having a brake mechanism is started by the number of signal pulses from the motor numerical control device, and the pedestal 9 is placed directly below the blanket body 1.
After the evacuation rack gear 32 is moved by a predetermined amount until it is located, it is stopped, and according to the next program, for example, the evacuation rack gear 32 is lowered, and only the blanket cylinder 1 is rotated a predetermined amount by the motor 35 that can rotate forward and reverse. Idle to the phase position. Then, for example, the retractable rack gear is returned to its original position according to the program, and the blanket cylinder 1 is returned to its original position.
When the desired detector (photoelectric type or limit switch) detects the return of the evacuation rack gear 32, the servo motor 19 is started, and the frame 9 moves further forward to move the printing material surface plate 6. The blanket cylinder 1 is rolled upward by a predetermined amount according to the program, and the gantry 9 is moved to the position of the retraction rack gear 32 at a point C outside the outer end of the printing material surface plate 6. Then, according to the following program, the retraction rack gear 32 at point C is lowered, and the blanket cylinder 1 is rotated in the normal direction.
Alternatively, after idling in the reverse direction and setting the blanket cylinder 1 to the desired phase, the evacuation rack gear 32 is raised and returned, and the servo motor 19 is started with the number of pulses according to the program to return the pedestal 9 to its original position. , or to move it by a predetermined amount.

<Operation of the Invention> According to the present invention, the frame 9 can be slid back and forth with respect to the blanket cylinder 1 while being stopped once intermittently, and the blanket cylinder 1 can be moved once at the time of stopping. It is possible to idle.

The printing machine of the present invention can be used, for example, as a dry offset printing machine when using letterpress or as an intaglio offset printing machine when using intaglio. The blanket cylinder can be rotated idly, and in order to prevent distortion of the elastic surface of the blanket during printing transfer, the blanket cylinder can have a considerably large diameter compared to the length of the gantry. Also, to explain an example of the program operation when printing on a printing material using the idle mechanism of the printing press of the present invention, two surface plates arranged in front and behind each have a plate 5 and a printing material 8. Fix it. With the blanket cylinder 1 in the removed state, the plate plate 3 is
After supplying ink to the plate 5, doctoring is performed when returning to the right direction in the drawing, the blanket cylinder 1 is inserted, and while moving in the same direction, it is rotated by a predetermined printing circumference. After transferring the ink from the plate to the two sides of the blanket, it is stopped. Next, the blanket cylinder 1 is removed, the direction of rotation is reversed, and the mount 9 is moved to the left. is stopped, the retraction rack gear 32 is lowered to release the mesh, and while only the blanket body 1 is idling in the clockwise rotation direction,
The blanket 2 to which the ink adheres is passed through the heating blower 15, the phase is set so as to align with the printing position on the printing medium 8, and the blanket 2 is stopped.
2 is raised to mesh with the pinion gear 18 of the blanket cylinder 1 and inserted into the cylinder, and the mount 9 is moved to the left to transfer the ink of the blanket 2 onto the printing material 8 for printing. During this time, the squeegee 24 is used to apply ink for the next printing onto the five surfaces of the plate. Next, the air cylinder 42 shown in FIG. After moving to the outside of the left end, the gear 32 is lowered to idle the blanket body 1 to the left, and while the urethane roller 14 is rotated in contact with the 2 surfaces of the blanket by the operation of the air cylinder 21,
Wipe off residual ink after printing. When the phase of the blanket 2 of the blanket cylinder 1 is adjusted to the same phase as that of the plate 5, the blanket cylinder 1 is stopped and the gear 32 is raised to mesh with the blanket cylinder 1. Next, after fixing the printing material 8 to be printed on the printing material surface plate 6, it is inserted into the body and placed on a mount 9.
is moved to the right to transfer the ink on the printing plate to the second surface of the blanket of the blanket cylinder 1. Sequentially,
Printing is performed by repeating the operations described above.

The above operations are an example of the printing program of the printing machine according to the present invention, and it is possible to perform various printing operations by changing the order of printing operations.

Further, this allows the printing machine length to be set regardless of the size of the blanket cylinder, and if necessary, it is also possible to provide the plate surface plate and the printing material surface plate close to each other.

<Effects of the Invention> Depending on the structure of the blanket cylinder, the printing press of the present invention can be applied to a circular pressure type convex plate printing machine or a concave plate printing machine, and a wide variety of printing operations are possible. It is possible to perform a reciprocating sliding operation by stopping the cylinder intermittently once in the middle, and once the blanket cylinder is stopped, it can be idled independently at a desired rotational speed regardless of the printing speed. It can change the printing phase, change the printing direction by repeatedly rotating forward and reverse, and perform overprinting, and is extremely effective for special printing such as precision printing. It is.

Further, this allows the printing machine length to be set regardless of the size of the blanket cylinder, and if necessary, it is also possible to provide the plate surface plate and the printing material surface plate close to each other.

As a result, an installation location can be easily secured and a large number of units can be installed.

Furthermore, it has become possible to improve pixel accuracy by independently increasing the diameter of the blanket cylinder.

[Brief explanation of drawings]

1 and 2 are side views of the printing press according to the invention, FIG. 3 is a plan view of the printing press according to the invention, FIG. 4 is a front view of the printing press according to the invention, and FIG. 5 is a control of the printing press according to the invention. System block diagram FIG. 6 is an example of an operation system control system diagram set in the control system of the printing press of the present invention.

Claims (1)

[Scope of Claims] 1. A reciprocating apparatus comprising: a blanket cylinder on its circumferential surface, which rotates while being pivotally supported by a main body frame; and a plate surface plate, a printing material surface plate, and a rack gear that meshes with pinion gears of the blanket cylinder. It consists of a movable pedestal, and includes retractable rack gears that can disengage the rack gears on both sides of the pedestal at the same phase position between the inner edges and both outer edges of the plate surface plate and the printing material surface plate. A printing machine characterized by a blanket cylinder that can idle. 2. The printing machine according to item 1, which includes a squeegee and a doctor that are supported by the main body frame and are moved up and down under predetermined control by an air cylinder toward the surface of the plate when the plate passes through the plate. 3. The printing machine according to claims 1 and 2, comprising urethane ink wiping rollers before and after the impression cylinder. 4. The printing machine according to items 1 to 3, which includes a hot air blower close to the peripheral surface of the impression cylinder. 5 Paragraphs 1 to 4 where the printing plate is letterpress or intaglio
Printing machine mentioned in section.