JPS61227057A - Printing press with automatic form-replacing device - Google Patents

Abstract

PURPOSE:To enable a form to be accurately clamped while retaining a predetermined positioned state, by providing a supporting mechanism for supporting the leading end of a form inserted into a form cylinder from a form-supplying part until the form is clamped. CONSTITUTION:At the time of replacing a form, when a form cylinder 2 is rotated so that an opening part 19 is located in correspondence with a stand-by position of a new form 1a, the leading end of the new form 1a is inserted into a divided part 16 of the cylinder 2. When the leading end of the new form 1a is clamped between a pair of rolls 20, 21 rotated in the direction for attracting in the leading end, the leading end is fed into a recessed part 22, and is positioned by the deep end surface of the recessed part 22. After positioning is finished, the new form 1a is accurately clamped by a clamp finger 24 while retaining the positioned state by being supported by the rolls 20, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing press such as a rotary press that supports a plate in a substantially cylindrical shape on the circumferential surface of a plate cylinder during rotation of the plate cylinder. The present invention relates to a printing press that includes an automatic plate change device that automatically changes plates and is provided with a support mechanism for supporting the leading edge of a plate supplied to a plate cylinder.

[Transmission] In a color printing press, the work of replacing the plate with a new plate after printing is frequently performed. In this printing press, the plate supported on the circumferential surface of the plate cylinder after printing is ejected from the plate cylinder, and a new plate is supported on the circumferential surface of the plate cylinder.

In the past, this type of plate changing work was done either automatically or manually, but in both cases, the tip of the plate fed to the plate cylinder was supported by a claw-shaped clamp member. This is done using the first clamp section.

It is clear that automatic version change work is preferable to manual work when considering the efficiency of the work that is intended to be done. However, JP-A-56-58
As described in No. 868, in the conventional automatic plate changing device, it is difficult to accurately clamp the tip of the plate supplied to the rotating plate cylinder with the clamp section. An important technical challenge was to ensure that the To accomplish this task, it is necessary to accurately position the plate during feeding. However, in the past, even when the plate is in a standby state or when being supplied, even if the plate is accurately positioned and fed, the plate may receive a shock when the plate is inserted, or the plate may be damaged until it is clamped by the clamp unit after insertion. Without something to support it, it became unstable and the plate could not be accurately clamped in place.

The present invention has been made to solve this problem, and is a printing machine that includes a support mechanism in an automatic plate changing device that can accurately clamp the leading edge of a plate supplied in a predetermined position while maintaining that position. The purpose is to provide

B. The present invention for fortune-telling includes a clamp part for clamping the tip of the inserted plate in the plate cylinder into which the tip of the plate is inserted from the plate supply part, and eliminates the impact at the time of insertion. However, it is a printing machine that has an automatic plate change device that supports the leading edge of the plate at least until it is clamped, and is equipped with a support mechanism that uses, for example, a pair of rolls or vacuum suction force.

The tip of the plate inserted into the plate cylinder from the working plate supply section is once supported by the support mechanism to eliminate the impact during insertion, and then
By performing the clamping operation by the clamp part, the plate is inserted in the correct position, and furthermore, the unstable state until the plate is clamped is eliminated, and the plate is accurately clamped in the positioned state. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figures 1 to 3 show a first embodiment in which the present invention is applied to a rotary press. Figure 1 is a side sectional view of the plate cylinder, and Figure 2 is a schematic diagram of the plate change 'Jff section during printing. side view, 3rd
Figures Ta) to Tfl are operation explanatory diagrams of the version change operation.

In Fig. 2, a plate cylinder 2 and an impression cylinder 3 supporting the plate 1 on the circumferential surface are shown.
The continuous paper 4 is conveyed in the direction of the arrow, and printing is performed by rotating the continuous paper 4 in opposite directions, which are the directions of the arrows. At predetermined positions around the plate cylinder 1, there are a plate supply section 5 for supplying the plate 1 to the plate cylinder 2, an ironing roll 6 for bringing the plate 1 into close contact with the circumferential surface of the plate cylinder 2, and ink in an ink storage section. A plurality of inking rolls 7 for applying a color to the plate surface, and a plate carrying-out section 8 for conveying the plate l discharged from the plate cylinder 2 after printing to an appropriate location are provided.

The plate supply unit 5 includes a pair of upper and lower delivery rolls 9.10 for feeding the new plate 1a to be supplied toward the plate cylinder 2, and a pair of upper and lower feed rolls 9.10 that lock the front and rear of the new plate 1a, respectively, to regulate the supply of the new plate 1a. It consists of a front stopper 11 and a rear stopper 12 that can be raised and lowered, and the new plate 1a is positioned in the width direction here. The feed roll 9 is connected to and rotationally driven by the same rotational drive source as the plate cylinder 2, and can move toward and away from the new plate 1a on the feed roll IO, and does not separate during printing in the illustrated state. However, when this comes into contact, a force is applied to the new plate 1a in the direction of the plate cylinder 2. Also,
During printing in the illustrated state, each of the stoppers 11, 12 is in a locked state, both facing down.

The squeezing roll 6 is configured to be rotatable and capable of moving toward and away from the circumferential surface of the plate cylinder 2. The pressure on the plate cylinder 2 is controlled so that the pressure is applied immediately before the opening of the plate cylinder 2, which will be described later, comes to a corresponding position, and the plate is separated immediately after the rear end of the plate 1 has passed. That is, the ironing roll 6 presses the entire new plate 1 supported on the circumferential surface of the plate cylinder 2 to bring it into close contact with the circumferential surface, while contacting the plate l after the ink has been applied. It is something that never happens. Therefore, since ink does not adhere to the ironing roll 6, the plate 1 to be pressed next is not stained.

The board unloading section 8 includes an unloading bell (13) that is circulated by an appropriate rotational drive system, and an old plate (1b) discharged from the plate cylinder 2.
It consists of a pair of upper and lower guide rolls 14 and 15 that are rotationally driven to guide the transport material (see FIG. 3) to the delivery belt 13. The rotational speed of each guide roll 14,15 is
The rotation speed of the plate cylinder 2 is set slightly higher than the rotation speed of the plate cylinder 2.
When the old plate 1b discharged from the plate is drawn in, the slack of the old plate 1b is absorbed by the above-mentioned speed difference. Further, a known torque limiter mechanism is provided at a suitable location in the rotational drive system (not shown) of the guide rolls 14 and 15, and this mechanism is activated when a tension exceeding a predetermined value is applied to the old plate 1b. The guide roll 14,1
5 and the rotational speed of the plate cylinder 2 are the same, and the old plate 1b is always discharged from the plate cylinder 2 with constant tension.

Next, the structure of the plate cylinder 2 will be explained in detail based on FIG.

The plate cylinder 2 has a removable dividing portion 16 having a semicylindrical cross section, and this dividing portion 16 is normally fixed by bolts 17 and 18. At the circumferential center of the divided portion 16 is an opening 19 into which the tip of the plate 1 (see FIG. 2) is inserted.
are provided to extend in the axial direction of the plate cylinder 2, and the vertical distance between the openings 19 is larger than the thickness of the plate 1, but is set to be narrow enough to prevent insertion of a finger.

Following this opening 19, a pair of upper and lower rubber rolls 20.21 are provided as a support mechanism for supporting the tip of the inserted plate 1.
is rotatably supported. These rolls 20.2
1 is connected to the same rotational drive source as the plate cylinder 2 so that it can be rotated in forward and reverse directions, and is controlled so that it rotates in the retracting direction when the plate 1 is inserted, and rotates in the feeding direction when the plate l is ejected. .

A recess 22 is formed next to the pair of rolls 20, 21 for vertically positioning the plate 1 fed into the plate cylinder 2. The tip of the plate 1 supported by the pair of rolls 20° 21 is brought into contact with the concave portion 22, eliminating rebound and displacement caused by impact, and accurate positioning, and the plate 1 once positioned is , and this state is maintained by the pair of rolls 20 and 21.

The recess 22 and the opening 19 communicate with each other, and the pair of rolls 20 and 21 are placed in this communication space.

Next, the clamp section will be explained. A plurality of clamp claws 24 each having an angular cross-section are screwed at predetermined intervals to a rotation shaft 23 arranged in the deep bone of the divided portion 16 in substantially parallel to the rotation axis of the roll 20. (However, only one clamp claw 24 is shown). The clamp claw 24 is for clamping the tip of the plate l that is supported by the pair of rolls 20 and 21 and pressed against the recess 9, and by the urging force of a spring (not shown), It is biased in the clamping direction (the direction of the state shown in the imaginary line). When the rotating shaft 23 is supported in a predetermined state against the biasing force, the clamp claw 24 becomes the state shown by the solid line, and the clamping operation is released.

Slightly above the opening 19 on the circumferential surface of the dividing part 16,
A plurality of suction ports 25 for sucking and supporting the rear end portion of the plate 1 are opened at predetermined intervals (however, only one is shown). Each intake port 25 communicates with a flow path 26 that communicates with a vacuum suction device (not shown), and the vacuum suction device applies a vacuum suction force to each intake port 25.

Incidentally, the timing of a series of operations for supplying and discharging the plate 1, which will be described later, by each of the above-mentioned components is controlled by a cam mechanism and a proximity switch (not shown).

Next, the version changing operation of this embodiment will be explained based on FIGS. 2 and 3.

In the printing state shown in FIG. 2, when a preset number of sheets have been printed, the zero plate cylinder 2, which receives a plate change command signal from a counter (not shown), rotates, and the opening 19 moves directly above. When the position is slightly past the position, the proximity switch that has received the command signal detects this and issues a detection signal, turning on the cam mechanism. When the plate cylinder 2 further rotates and the opening 19 reaches a position slightly past the bottom, the clamp claw 24 releases the clamp on the tip of the plate 1b due to the action of the cam mechanism, and the pair of rolls 20.2
1 rotates in the feeding direction. (See Fig. 3+8)) As a result, the leading edge of the plate 1b begins to separate from the plate cylinder 2, and the plate discharge operation is started.

The tip of the old plate 1b that has separated from the plate cylinder 2 is drawn into a pair of guide rolls 14.
3. J: will lead you to the third stage. On the other hand, when the opening 19 reaches a position slightly before the standby position of the new plate 1a due to the rotation of the plate cylinder 2, the pair of rolls 20, 21 reverses and rotates in the drawing direction.

When the opening 19 corresponds to the standby position of the new plate 1a, each stopper 11.12 releases the locked state, the feed roll 9 comes into contact with the new plate 1a, and the tip of the new plate 1a moves from the opening 19 to the plate cylinder. It is inserted into the dividing section 16 of No. 2. When the leading end of the new version 1a is held between a pair of rolls 20, 21 rotating in the retraction direction, it is fed into the recess 22 and positioned by its rear end surface. (See Figure 3)
When the positioning is completed, the feed roll 9 separates from the new plate 1a, and the new plate 1a is supported by the pair of rolls 20 and 21 in the above-mentioned rotating state, and the clamp displaced by the action of the cam mechanism remains in the positioning state. It is accurately clamped by the claws 24. After this clamping operation, the pair of rolls 20, 21 stop rotating. (Figure 3 (C
1) When the plate cylinder 2 rotates, the opening 19 opens the ironing roll 6.
When it reaches a position slightly in front of the corresponding position, the above-mentioned ironing roll 6
is pressed onto the plate cylinder 2. As a result, as the plate cylinder 2 rotates, the new plate 1a whose tip end is supported by the plate cylinder 2 is squeezed by the ironing roll 6 and is successively brought into close contact with the circumferential surface of the plate cylinder 2 (see Fig. 3). (See dl) When the plate cylinder 2 further rotates and the aforementioned proximity switch issues a second detection signal, the cam mechanisms controlling the feed roll 9, the pair of rolls 20, 21, and the clamp claws 24 are turned off. , and thereafter maintains the same state until a plate change command signal is issued.On the other hand, in the old plate 1b, when the rear end passes slightly below, the vacuum suction force acting on the intake port 25 is released.
It is completely separated from the plate cylinder 2.

Until this state of separation is reached, the old plate 1b is always guided onto the delivery belt 13 while being applied with a constant tension by the pair of guide rolls 14, 15, so that it does not sag.
You can print cleanly until the end, and there is no waste paper.

When the discharge of the old plate 1b is completed and the rear end of the new plate 1a is brought into close contact with the plate cylinder 2 by the ironing roll 6, the vacuum suction force is applied to the intake port 25 again, and the new plate 1a is supported on the plate cylinder 2 in a cylindrical shape. be done. Immediately before the opening 19 returns to its corresponding position, the squeezing roll 6 is separated from the plate cylinder 2. (See FIG. 3(e)) Next, a new plate 1a to be supplied next is brought from a stacker (not shown) and placed in a predetermined standby state in preparation for a new plate change operation. . (Refer to FIG. 3(f) and FIG. 2) According to the first embodiment described above, the plate cylinder 2 is provided with a removable divided portion 16, and the support mechanism for the plate 1 is all disposed within this divided portion 16. So,
This has the advantage that maintenance and management of the support mechanism becomes easier.

Next, a second embodiment of the present invention will be described based on FIG.

FIG. 4 is a schematic side sectional view of the plate cylinder, and the opening 32, which is opened at a predetermined angle with respect to the radial direction from the circumferential surface of the plate cylinder 31, has a vertical interval that is equal to that of the first embodiment. As in the example, version 1
Although the thickness is larger than that of the 100mm, the distance between them is so narrow that it is impossible to insert a finger into them. Then, the opening 32
A concave portion 33 communicating with the plate 33 positions the plate l inserted through the opening 32 in the vertical direction at its real end surface.

An intake port 35 is provided on the upper surface of the recess 33 and serves as a support mechanism that temporarily supports the tip of the plate 4 inserted from the opening 33.
A plurality of intake ports 35 are opened at predetermined intervals (however, only one is shown), and each intake port 35 communicates with a flow path 36 that communicates with a vacuum suction device (not shown). In addition, the recess 33
In order to forcibly discharge the tip of the plate 1 inserted from the opening 32 out of the plate cylinder 31, there are jet ports 36 at predetermined intervals on the bottom surface of the plate 1 for blowing air to the tip of the plate 1. There are multiple openings (however, only one is shown).

Each spout 36 communicates with a flow path 40 that communicates with a blower device (not shown).

The clamp portion that clamps the tip of the plate l inserted into the plate cylinder 31 from the opening 22 is formed in the same manner as in the first embodiment, except that the overall shape of the clamp claw 3 is formed in an arc shape. ing.

It should be noted that this embodiment has the same structure and operation as the first embodiment except for the above-mentioned structure, so the other explanations will be omitted.

In the second embodiment, the plate 1 inserted into the opening 32 from the plate supply section is positioned by the vacuum suction force acting on each suction port 34, eliminating bounce and displacement caused by impact at the time of insertion. In addition to being supported, it is clamped by the clamp claws 38 while maintaining the positioning state. Further, when the plate 1 is released from the plate cylinder 3I, the clamp is released, the vacuum suction force is released, and
Air is ejected from each ejection port 36.

In this way, in the second embodiment, each operation of temporarily supporting and discharging the plate 1 on the plate cylinder 31 is performed by air, so the first embodiment employs a pair of rolls 20 and 21 as a support mechanism. Compared to the example, there are advantages in that the support operation is easier and more reliable to control, the configuration is simplified, and the ejecting operation of the plate 1 is also more reliable.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the jet port 36 may be provided in the first embodiment, and the divided portion 1 may be provided in the plate cylinder 31 in the second embodiment.
6 may be provided. Furthermore, instead of or together with the dividing part 16, a lid may be provided at the portion where the support mechanism and clamp part of the plate cylinder 2.31 are arranged, thereby simplifying maintenance and management. Furthermore, clamp claw 2
4. The shape of the 3rd is not limited to the above-mentioned one and can be changed in various ways, and the control means for each component including the clamp claws 24 and 38 is not limited to the above-mentioned embodiments. . Furthermore, the printing paper used may be supplied not only as a continuous paper but also as a single piece of paper from a sheet feeding device or the like. In addition, the printing format of the present invention is not limited to letterpress printing, but may also be offset printing, in which case the paper relative to the plate cylinder is positioned via a blanket cylinder, but the blanket cylinder is connected to the plate cylinder. Alternatively, a plurality of plates may be prepared and arranged, and the selection may be performed by a plate cylinder switching device that sequentially switches the plate cylinders into contact with the plate cylinder at the same time as the plate change.

EFFECTS--As is clear from the above explanation, according to the present invention, by adopting the support mechanism, the impact when the plate is inserted into the plate cylinder from the plate supply section is eliminated. Since the plate is placed in an accurate position and the plate once positioned can be clamped while maintaining that state, the clamping operation can be performed accurately while rotating the plate cylinder in the automatic plate changer, and This method has many advantages, such as making it easier to control the operation of supplying and discharging a series of plates to and from the plate cylinder, and also being able to handle high-speed rotation of the plate cylinder.

[Brief explanation of the drawing]

The figures show a preferred embodiment when the present invention is applied to a rotary press, and FIG. 1 is a side sectional view of a plate cylinder showing the first embodiment,
The figure is a schematic side view of the plate changing device section with the plate cylinder in the printing standby state as a cross section, Figures 3(a) to (fl) are explanatory diagrams of the plate changing operation, and Figure 4 shows the second embodiment. It is a schematic side sectional view of the plate cylinder shown. 1, la, 1b --- plate 2.31... plate cylinder
19.32... Opening 20° 21... Roll 22.23... Recess 24.38... Clamp claw 34... Intake port 36... Outlet

Claims (1)

[Claims] A printing machine that performs printing by supporting a plate in a substantially cylindrical shape on the peripheral surface of a rotatable plate cylinder, the plate cylinder having an opening into which the tip of the plate is inserted, and the plate being inserted into this opening. A plate supply unit is provided, and the plate cylinder includes a clamp unit that clamps the tip of the plate inserted from the opening, and a support mechanism that supports the plate at least until the plate is clamped. , a printing press having an automatic plate change device.