JPH11300930A - Plate stretching device in printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to largely change tension to a press plate by a small operational stroke and to easily and rapidly adjust the tension to the press plate. SOLUTION: A non-gripper end side clamp base 13 is energized in the arrow mark 91 direction by means of a spring to pull the non-gripper end side end part 10b of a printing plate 10 and to bring the printing plate 10 into close contact with the outer peripheral face of a plate cylinder 60. The holding bottom side clamp base 13 is also energized in the arrow mark 92 direction by means of a returning spring 3 and energizing force of the returning spring 3 can be adjusted by rotating operation of an operational bolt 6. When the energizing force of the returning spring is largely adjusted, energizing of the non-gripper end side clamp base 13 in the arrow mark 91 direction is offset to pull the printing plate 10 by a weak tension. In addition, when the energizing force of the returning spring is a little adjusted, the non-gripper end side clamp base 13 is moved strongly in the arrow mark 91 direction to pull the printing plate 10 by a strong tension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate setting device for a printing press, and more particularly, to a plate in which a plate is brought into close contact with the outer peripheral surface of a plate cylinder by moving a clamp portion which holds an end of the plate. It relates to a tensioning device.

[0002]

2. Description of the Related Art As shown in FIG. 9, a printing plate 10 is wound around an outer peripheral surface of a plate cylinder 60 used for offset printing, and ink and dampening water are supplied to the printing plate 10 to perform printing. It is. A notch 61 is formed in the plate cylinder 60. A notch-side clamp base 62 and a notch-side clamp base 63 are provided in the notch 61.

[0006] A clamp 64 on the grip side is located on the clamp base 62 on the grip side.
Between the gripper side clamp 64 and the gripper side end 1 of the printing plate 10
0a is sandwiched and fixed. A tail-side clamp 65 is located on the tail-side clamp base 63. The tail-side side of the printing plate 10 is located between the tail-side clamp base 63 and the tail-side clamp 65. The end 10b is sandwiched and fixed.

Here, it is necessary to bring the printing plate 10 into close contact with the outer peripheral surface of the plate cylinder 60 in order to perform proper printing. In this case, usually, the tail-side clamp base 63 and the tail-side clamp 65 are moved in the pulling direction (the direction of the arrow 91), and the printing plate 10 is pulled to be in close contact with the outer peripheral surface of the plate cylinder 60.

As a prior art of such a plate setting apparatus, there is a plate cylinder mechanism of a printing press described in Japanese Patent Publication No. 4-70145. FIG. 10A shows a state in which tension is not applied to the printing plate 10 and the plate 10 is not in close contact with the outer peripheral surface of the plate cylinder 60, and FIG. 2 shows a state in which it is in close contact with.

[0006] The plate cylinder 60
A plurality of springs 70 are provided in the axial direction of the clamp base 63.
Are urged in the direction of arrow 91. A spring adjusting bolt 71 is in contact with each spring 70. The spring adjusting bolt 71 is screwed into and penetrates the tail-side clamp base 63, and adjusts the resilience of the spring 70 by rotating.

A protrusion 74 is formed below the tail-side clamp base 63. A circular crankshaft is provided between the protrusion 74 and a step 78 formed in the notch 61 of the plate cylinder 60. 76 is located. This circular crankshaft 76
Has a notched plane 77. When tension is applied to the printing plate 10 from the state shown in FIG. 10A, the notched plane 77 is made to face the projection 74 by rotating the circular crank shaft 76. As a result, the tail-side clamp base 63 moves in the pulling direction (the direction of the arrow 91).

[0008] That is, the clamp base 63 on the tail side of the tail is always set to the arrow 91 by the elastic force of the plurality of springs 70.
The clamp base 63 moves to just before contacting the notch plane 77, so that the printing plate 10
Is pulled and adheres to the outer peripheral surface of the plate cylinder 60 as shown in FIG. 10B. As described above, tension is applied to the printing plate 10 to bring the printing plate 10 into close contact with the outer peripheral surface of the plate cylinder 60.

[0009]

The above-mentioned conventional plate setting apparatus has the following problems. The printing plate 10 is made of various materials such as aluminum, resin, paper and the like. When the printing plate 10 is brought into close contact with the outer peripheral surface of the plate cylinder 60, the tension applied to the printing plate 10 needs to be adjusted according to the material. is there. For example, a metal PS plate (presensitized offset plate) needs to be pulled with strong tension, and a paper plate needs to be pulled with weak tension.

[0010] In the prior art shown in FIG. 10, the tail end side clamp base 63 is moved in the direction of arrow 91 by rotating the circular crankshaft 76. Then, in this conventional technique, the spring force of the spring 70 is adjusted by the spring adjustment bolt 71.

Here, since the PS plate needs to be pulled with a strong tension and the paper plate needs to be pulled with a weak tension, for example, the movement stroke of the spring adjusting bolt 71 in the directions of arrows 91 and 92 is set to be large, and the spring 70 is set. What is necessary is just to be able to largely change the length of. If the length of the spring 70 can be largely changed, the resilience of the spring 70 can be largely changed, and it can be appropriately applied to a PS plate, a paper plate, or the like.

However, in general, the notch 61 of the plate cylinder 60
The space inside is small, and the stroke of the spring adjustment bolt 71 in the directions of the arrows 91 and 92 cannot be made large. For this reason, a large amount of change in the tension of the spring 70 cannot be secured, and an appropriate tension cannot be applied to the PS plate, paper plate, or the like.

[0013] That is, the spring 7
When 0 is used, when the paper plate is attached, even if the spring adjusting bolt 71 is loosened and moved in the direction of the arrow 92 to lower the tension of the spring 70, the tension is not sufficiently suppressed, and the tension is excessively strongly pulled. As a result, the paper plate is elongated.

On the other hand, if a material having a low tension is used as the spring 70, even if the tension of the spring 70 is increased by tightening the spring adjusting bolt 71 and moving it in the direction of the arrow 91 when mounting the PS plate, the tension will not increase. Weak, P
The S plate cannot be securely brought into close contact with the outer peripheral surface of the plate cylinder 60.

When adjusting the spring force of the spring 70 with the spring adjusting bolt 71, it is necessary to rotate the spring adjusting bolts 71 provided in the axial direction of the plate cylinder 60 one by one. For this reason, the printing plate 10
There is also a problem that it takes time and effort to adjust the tension according to the type of the tension.

Therefore, the present invention can greatly change the tension on the printing plate with a small operation stroke,
It is another object of the present invention to provide a plate tensioning device for a printing press capable of easily and quickly adjusting the tension of a printing plate.

[0017]

According to the first aspect of the present invention, the tension urging portion urges the second clamp portion in the tensioning direction, and the restricting urging portion urges the second clamp portion in the tensioning direction. 2. Press the clamp in the loosening direction. And
The adjusting unit adjusts the urging force of the restricting urging unit with respect to the second clamp unit.

That is, when the adjusting portion adjusts the biasing force of the limiting biasing portion to be small, the second clamp portion is relatively strongly biased in the pulling direction by the pulling biasing portion. On the other hand, when the adjusting portion adjusts the biasing force of the restricting biasing portion to be large, the biasing of the pulling biasing portion is canceled by the biasing of the limiting biasing portion, and the second clamp portion is compared with the pulling direction. It is energized weakly.

As described above, since the biasing force of the tension biasing portion is offset and suppressed by the biasing force of the restricting biasing portion, the biasing of the second clamp portion can be significantly suppressed with a small operation stroke of the adjusting portion. And the tension on the printing plate can be greatly changed.

According to a second aspect of the present invention, the restricting urging portion is a restricting spring portion formed by a spring, and the restricting spring portion is in contact with a contact surface of the second clamp portion. , And the abutment surface of the adjustment unit. Then, the biasing force of the limiting spring portion with respect to the second clamp portion is adjusted by the contact surface of the adjustment portion approaching or separating from the contact surface of the second clamp portion.

As described above, since the restricting spring portion constituted by the spring is used as the restricting urging portion, the second clamp portion can be surely urged in the loosening direction with a simple configuration. Further, by bringing the contact surface of the adjusting portion closer to or away from the contact surface of the second clamp portion, the second
Since the biasing force of the limiting spring portion with respect to the clamp portion is adjusted, the biasing force of the limiting spring portion can be reliably adjusted with a simple configuration.

According to the third aspect of the present invention, the limit spring portion is located between the contact surface of the second clamp portion and the cam surface of the cam of the cam adjustment portion. . Then, the cam surface approaches or separates from the contact surface of the second clamp unit according to the rotation operation of the rotation operation unit provided in the cam adjustment unit.

When the cam surface approaches or separates from the contact surface of the second clamp, the biasing force of the restricting spring with respect to the second clamp is adjusted. And the second
By adjusting the biasing force of the limit spring portion with respect to the clamp portion, the biasing force of the tension spring portion in the pulling direction of the second clamp portion is adjusted.

That is, when the cam surface of the cam provided in the cam adjusting portion is separated from the contact surface of the second clamp portion and the biasing force of the limit spring portion is adjusted to be small, the second clamp portion is controlled by the tension spring portion. It is biased relatively strongly in the pulling direction. On the other hand, when the cam surface is brought close to the contact surface of the second clamp portion and the biasing force of the limiting spring portion is adjusted to be large, the biasing force of the tension spring portion is canceled by the biasing force of the limiting spring portion, and the second The clamp is biased relatively weakly in the pulling direction.

As described above, since the biasing of the tension spring portion is offset and suppressed by the biasing of the limiting spring portion, the biasing of the second clamp portion can be significantly suppressed with a small operation stroke of the cam adjusting portion. It is possible to greatly change the tension on the printing plate.

Further, the second clamp portion is urged in the tension direction by the tension spring portion, and the second clamp portion is urged by the restriction spring portion.
The clamp is biased in the loosening direction. For this reason, it is possible to reliably bias the second clamp portion in the pulling direction and the loosening direction with a simple configuration.

Further, a cam adjusting section comprising a rotary operation section and a cam whose eccentric position is fixed to the center axis of the rotary operation section is used, and the cam surface is changed according to the rotation operation of the rotary operation section. , Are brought closer to or away from the contact surface of the second clamp portion. For this reason, the urging force of the limiting spring portion with respect to the second clamp portion can be reliably adjusted with a simple configuration by using a small rotation operation amount of the rotation operation portion.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Configuration of Main Part An embodiment of a plate-setting apparatus for a printing press according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a plate cylinder 60 provided with a plate tensioning device in the present embodiment. FIG. 2A is a sectional view taken in the direction of arrow II in FIG.
FIG. 2B is a sectional view taken along the line II-II shown in FIG. 3A and 3B are cross-sectional views taken along the line III-III shown in FIG.

FIGS. 4A and 4B show IX-IX shown in FIG. 3B.
5A is a cross-sectional view taken along a line IV-IV shown in FIG. 1, and FIG. 5B is a cross-sectional view taken along a VV direction shown in FIG. 1. 6A is a sectional view taken along the line VI-VI shown in FIG. 1, and FIG. 6B is a sectional view taken along the line VII-VII shown in FIG. FIG. 7 shows VIII-VIII shown in FIG.
It is arrow sectional drawing of the direction.

The plate cylinder 60 rotates around a plate cylinder shaft 60J shown in FIG. And this plate cylinder 60
Is formed with a notch 61, and the notch 61
Inside thereof, a tail-side clamp base 62 and a tail-side clamp base 13 are provided.

A grip 64 on the grip side is provided above the grip base 62 on the grip side. Then, the grip-side end 10a (first end) of the printing plate 10 is sandwiched and fixed between the tip side of the grip-side clamp 64 and the grip-side clamp base 62. The grip-side clamp base 62 and the grip-side clamp 64 are the first clamp portions in the present embodiment.

The clamping clamp 64 is provided with an opening / closing center bolt 64.
It swings in the directions of arrows 93 and 94 around J (see FIGS. 1 and 5A), and the tip of the clamp 64 on the grip side opens and closes. The grip 64 is always urged in the direction of arrow 94 by an opening spring 64K (see FIG. 2B).

The grip cam shaft 17 is in contact with the rear end of the grip 64 on the grip side. The gripping cam shaft 17 is used for the plate cylinder 6.
0 is arranged in the same direction as the plate cylinder axis 60J.
It is rotatably supported at zero. When the outer peripheral surface 17G of the gripper cam shaft 17 is in contact with the rear end of the gripper side clamp 64, the rear end of the gripper side clamp 64 is pushed up and the front end is closed in the arrow 93 direction. On the other hand, the camshaft 1
When the flat surface 17M of the abutment 7 is in contact with the rear end of the gripper clamp 64, the tip of the gripper clamp 64 is opened in the direction of arrow 94 under the bias of the opening spring 64K.

With the gripper side clamp 64 opened in the direction of arrow 94, the gripper side end 10a of the printing plate 10 is inserted between the gripper side clamp base 62 and the gripper side clamp 64 to hold the gripper. The gripper side clamp 64 is closed by rotating the cam shaft 17 for use. As a result, the grip-side end 10a of the printing plate 10 can be fixed by being sandwiched between the grip-side clamp base 62 and the grip-side clamp 64.

A tail-side clamp 15 is provided on the top of the tail-side clamp base 13, and the tail-side end 10b (second end) of the printing plate 10 wound around the outer peripheral surface of the plate cylinder 60. End) is clamped and fixed between the tail end clamp base 13 and the tail end clamp 15. The tail edge side clamp base 13 and the tail edge side clamp 15 are the second clamp portions in the present embodiment.

The tail-side clamp 15 extends into the notch 61 of the plate cylinder 60, and is swingably supported by the clamp shaft 15J (see FIG. 2B). An opening spring 15K is attached to the bolt 21 provided on the tail end side clamp 15 (FIGS. 3A, 3B, and 6).
A), the tip of the tail end clamp 15 is always urged in the direction of arrow 93 by the opening spring 15K.

A contact bolt 23 is attached to the back side of the tail end clamp 15 (see FIGS. 2A and 2B).
The tail cam shaft 18 is in contact with the contact bolt 23. The cam shaft 18 for the tail end is a plate cylinder shaft 60 of the plate cylinder 60.
It is arranged in the same direction as J and is rotatably supported by the plate cylinder 60.

When the outer peripheral surface 18G of the tail cam shaft 18 is in contact with the contact bolt 23, the tail clamp 1
5 is pressed and the tip closes in the direction of arrow 94. On the other hand, when the flat surface 18M of the tail cam shaft 18 is in contact with the contact bolt 23, the tip of the tail clamp 15 is biased by the opening spring 15K and the tip of the arrow (See broken line in FIG. 2B).

After fixing the edge 10a of the printing plate 10 at the grip side between the grip clamp base 62 and the grip 64, the printing plate 10 is wound around the outer peripheral surface of the plate cylinder 60, and With the side clamp 15 opened in the direction of arrow 93, the tail end 10b of the plate 10 is inserted between the tail clamp base 13 and the tail clamp 15.

Then, the tail end cam shaft 18 is rotated to close the tail end clamp 15. Thereby, the printing plate 1
The tail end side 10b of the tail 0, the tail side clamp base 13
And clamp it with the back end clamp 15 and fix it.
0 can be attached to the plate cylinder 60.

The tail-side clamp 15 is provided movably in the directions of arrows 91 and 92 with respect to the plate cylinder 60. The direction of arrow 91 is the pulling direction in the present embodiment, and the direction of arrow 92 is the loosening direction in the present embodiment. When the tail end side clamp 15 moves, the clamp shaft 15
J, the tail end side clamp 15 and the tail end cam shaft 18 also move together.

As shown in FIG. 5A, a plate tension spring 2 as a tension urging portion or a tension spring portion is provided between the inner wall of the notch portion 61 of the plate cylinder 60 and the tail end clamp 15. I have. The tail-side clamp 15 is always urged in the direction of the arrow 91 by the plate tension spring 2. In the present embodiment, as shown in FIG.
Although ten plate tension springs 2 are provided in the direction of the plate cylinder shaft 60J, fewer or more plate springs may be provided.

A base space 13S is formed in the tail-side clamp base 13. And this base space 1
The plate setting cam shaft 16 is positioned so as to penetrate the 3S. The plate setting cam shaft 16 is a plate cylinder shaft 60J of the plate cylinder 60.
And is rotatably supported by the plate cylinder 60.

When the outer peripheral surface 16G of the cam shaft 16 is in contact with the inner wall of the base space 13S of the clamp base 13 on the tail side, the clamp base 13 on the tail side of the clamp is formed on the outer peripheral surface of the cam shaft 16 for plate tension. It is moved in the direction of arrow 92 by being pressed by 16G. On the other hand, when the recessed surface 16M of the plate setting cam shaft 16 is opposed to the inner wall of the base space 13S, the tip of the gripping rear clamp base 13 is biased by the plate setting spring 2 in the arrow 91 direction. Go to

As shown in FIG. 6A, the block 9 is fixed in the notch 61 of the plate cylinder 60 by the block fixing bolt 22. Block 9 is stationary with respect to plate cylinder 60. The block 9 is formed with a spring hole 3S extending in the directions of the arrows 91 and 92 and a cam hole 5S extending in a direction orthogonal to the directions of the arrows 91 and 92 (see FIGS. 3A and 3B). One end of the spring hole 3S is open toward the tail end side clamp base 13, and the other end communicates with the cam hole 5S.

As shown in FIGS. 3A and 3B, the return spring 3 and the intervening pin 4 are coaxially housed in the spring hole 3S in a connected state. The return spring 3 is extendable and contractable in the spring hole 3S of the block 9, and the interposition pin 4 is movable in the directions of arrows 91 and 92.

The return spring 3 and the intervening pin 4 are the limiting biasing portion or the limiting spring portion in the present embodiment.
In the present embodiment, the urging force of the return spring 3 is set to be weaker than the urging force of the plate tension spring 2.

The end of the return spring 3 is in contact with the tail end clamp 15. The contact portion of the return spring 3 is the contact surface of the tail end clamp 15. The contact surface of the tail-side clamp 15 with which the return spring 3 contacts is located on the opposite side of the surface of the tail-side clamp 15 with which the plate tension spring 2 contacts, and is positioned substantially parallel to the surface. I have.

On the upper surface of the block 9, an operation bolt 6 as a rotation operation part is attached. The cam 5 is attached to the operation bolt 6. The cam 5 is located in the cam hole 5S, and the eccentric position is supported by a rotation axis 6J that is a center axis of the operation bolt 6. The cam 5 and the operation bolt 6 are an adjusting unit or a cam adjusting unit in the present embodiment.

The end of the intervening pin 4 is in contact with the cam surface of the cam 5. By the bias of the return spring 3, the intervening pin 4 is constantly pressed against the cam surface of the cam 5. As shown in FIGS. 4A and 4B, the cam surface of the cam 5 is formed with two recesses facing each other, and when the operation bolt 6 is rotated, any one of the two recesses is interposed. The end of the pin 4 is inserted and positioned.

As described above, the return spring 3, the intervening pin 4, the operation bolt 6, and the cam 5 are incorporated in the block 9. In the present embodiment, this block 9
Although four are provided in the direction of the plate cylinder shaft 60J as shown in FIG. 1, fewer or more may be provided.

FIG. 4A corresponds to the states of FIGS. 3A, 3B, and 5A, and FIG. 4B shows the state in which the operation bolt 6 and the cam 5 are rotated by approximately 180 degrees from the state of FIG. 4A. When the cam 5 is in the state shown in FIG. 4A, the intervening pin 4 is pressed by the cam surface of the cam 5 and moves in the direction of the arrow 92. As a result, the return spring 3 is compressed, and the return spring 3 presses the tail end clamp base 13 to the arrow 92 in accordance with the compression.

On the other hand, when the cam 5 is positioned as shown in FIG. 4B, the intervening pin 4 moves in the direction of the arrow 91 and the return spring 3 expands. By this extension, the pressing of the return spring 3 to the arrow 92 with respect to the tail-side clamp base 13 is substantially released.

(2) Plate tensioning work (2-1) When pulling a printing plate with a weak tension The gripping side end 10a of the printing plate 10 is gripped by the gripping side clamp base 6.
2 and the clamp 64 on the side of the clamp, and the plate 10 is fixed by sandwiching the rear end 10b of the plate 10 between the clamp base 13 on the rear of the clamp and the clamp 15 on the rear of the clamp. The state is FIG. 3A. At this stage, the printing plate 10 is not in close contact with the outer peripheral surface of the plate cylinder 60, and the vicinity of the edge 10 b on the side of the edge of the plate 10 is raised from the outer peripheral surface of the plate cylinder 60.

If the printing plate 10 is not in close contact with the outer peripheral surface of the plate cylinder 60, proper printing cannot be performed. For this reason, the plate tensioning cam shaft 16 is rotated to move the tail edge side clamp base 13 and the tail edge side clamp 15 in the direction of the arrow 91, thereby pulling the printing plate 10 and closely contacting the outer peripheral surface of the plate cylinder 60. Let it.

By the way, the printing plate 10 includes aluminum, resin,
There are various materials such as paper, and the tension applied to the printing plate 10 when it is brought into close contact with the outer peripheral surface of the plate cylinder 60 needs to be adjusted according to the material. For example, a metal PS plate needs to be pulled with high tension, and a paper plate needs to be pulled with low tension.

Here, the printing plate 10 such as a paper plate is first placed on the plate cylinder 6.
The case where the printing plate 10 is attached to 0, that is, the case where the printing plate 10 is pulled with a weak tension will be described. In this case, the operating bolt 6 is operated in advance to position the cam 5 in the state shown in FIGS. 3A, 3B, and 4A. As a result, the intervening pin 4 is pressed by the cam surface of the cam 5 and moves in the direction of the arrow 92, and the return spring 3 is compressed.

In response to the compression of the return spring 3, the tail-side clamp base 13 is urged by an arrow 92. Then, in this state, the plate setting cam shaft 16 is rotated so that the concave surface 16M is opposed to the inner wall of the buttocks side clamp base 13. The rotation of the plate setting cam shaft 16 causes the tail end side clamp base 13 to move the outer peripheral surface 1 of the plate setting cam shaft 16.
The restriction by 6G was lifted and the plate tension spring 2 (Fig. 1,
It moves in the direction of arrow 91 under the bias of FIG. 5).

At this time, the tail-side clamp base 13 is urged in the direction of arrow 92 by the return spring 3. For this reason, the urging in the direction of arrow 91 by the plate tension spring 2 is offset by the urging of the return spring 3,
The urging force in the direction of arrow 91 is suppressed. Therefore, the printing plate 10 is pulled with a weak tension, and a suitable tension can be applied to the printing plate 10 such as a paper plate.

As described above, the urging force of the return spring 3 in the direction of the arrow 92 cancels the urging force of the plate tension spring 2 in the direction of the arrow 91, so that the small operation stroke of the cam 5 (the arrow 91 of the cam 5). Movement amount in 92 directions)
And the tail end clamp base 13 and the tail end clamp 1
5 can be greatly suppressed, and a printing plate 1 such as a paper plate can be used.
A weak tension suitable for zero can be applied.

(2-2) When the plate is pulled with a strong tension Next, a case where the plate 10 such as a PS plate is attached to the plate cylinder 60, that is, a case where the plate 10 is pulled with a strong tension will be described. In this case, the operating bolt 6 is operated in advance to position the cam 5 in the state shown in FIG. 4B. As a result, the intervening pin 4 moves in the direction of arrow 91, and the return spring 3 expands. In this embodiment, at this time, the return spring 3 is fully extended, and the tail end clamp base 13 is held.
Is set so that the bias of the return spring 3 is hardly applied.

In this state, the plate setting cam shaft 16 is rotated so that the concave surface 16M is opposed to the inner wall of the clamp base 13 on the tail side. The rotation of the plate-shaping cam shaft 16 causes the tail-side clamp base 13 to move the plate-shaping cam shaft 16.
Is released by the outer peripheral surface 16G, and moves in the direction of arrow 91 under the bias of the plate tension spring 2 (see FIGS. 1 and 5).

At this time, unlike the case where the cam 5 is in the state shown in FIG. 4A as described above, the urging force of the plate tension spring 2 against the tail edge side clamp base 13 is the urging force of the return spring 3. Not offset by. For this reason, the tail end clamp base 13 is strongly pressed in the direction of arrow 91 by receiving the urging force of the plate tension spring 2,
The edge 10b on the tail side of the printing plate 10 is pulled with strong tension.

As described above, the operating bolt 6 and the cam 5 are operated to release the urging force of the return spring 3 in the direction of the arrow 92 with respect to the clamp base 13 on the side of the tail, so that the small operation stroke (cam Arrow 9 of 5
(The amount of movement in the 1,92 directions), the bias of the tail-side clamp base 13 and the tail-side clamp 15 can be greatly increased, and a strong tension suitable for the printing plate 10 such as a PS plate can be obtained. Can be added.

While the grip base 13 moves in the direction of the arrow 91 to pull the grip end 10b of the plate 10, the block 9 provided with the return spring 3 is not shown. It is fixed to the plate cylinder 60 and does not move.

As a result, the return spring 3 is compressed by the movement of the tail end clamp base 13 in the direction of the arrow 91, and the biasing force of the return spring 3 slightly offsets the biasing force of the plate tension spring 2. However, the biasing force of the plate tension spring 2 and the return spring 3 may be set so that a strong tension suitable for pulling the printing plate 10 such as a PS plate is generated in the offset state. .

In the present embodiment, the amount of movement of the tail-side clamp base 13 in the direction of the arrow 91 during the plate-laying operation is as small as about 1 mm or less. For this reason, even if the tail end clamp base 13 moves in the arrow 91 direction,
The urging force of the return spring 3 set using the cam 5 hardly changes, and the tension on the printing plate 10 is not practically affected.

(3) Other Embodiments (3-1) As another embodiment of the plate applying apparatus for a printing press according to the present invention, a configuration as shown in FIG. 8A may be adopted. FIG. 8A shows a block 9 described with reference to FIGS.
It is a plane sectional view of a part. A block 9 shown in FIG. 8A is provided with a linear motion cam 25 as an adjustment unit or a cam adjustment unit instead of the cam 5 and the operation bolt 6 described above. Other configurations are the same as those described with reference to FIGS.

The translation cam 25 has a slope 25N, and is held in the block 9 so as to be movable in the directions of arrows 95 and 96. The end of the intervening pin 4 comes into contact with the slope 25N of the translation cam 25. In the state shown in FIG. 8A, the arrow 9
The end of the interposition pin 4 is in contact with a portion where the length of the translation cam 25 in the directions 1 and 92 is short.

For this reason, the intervening pin 4 is
Is moved in the direction of the arrow 91 under the urging of the return spring 3 with respect to the clamp base 13 on the side of the tail.
The biasing force in two directions is small. Therefore, when the plate-holding cam shaft 16 (see FIGS. 3A and 3B) is rotated to move the tail-side clamp base 13 in the direction of the arrow 91, the tail-side clamp base 13 is attached to the plate-spring spring 2 (see FIG. 5A). ), The plate 10 moves strongly in the direction of arrow 91, and the edge 10b at the tail end of the plate 10 is pulled with strong tension. Therefore, a strong tension suitable for the printing plate 10 such as a PS plate can be applied.

A printing plate 1 such as a paper plate using the configuration shown in FIG.
When attaching 0 to the plate cylinder 60, the translation cam 25 is moved in the direction of the arrow 95 from the state shown in FIG. 8A. Thus, the intervening pin 4 is pressed in the direction of the arrow 92 along the inclined surface 25N of the translation cam 25, and the return spring 3 is compressed.

In response to the compression of the return spring 3, the tail-side clamp base 13 is urged by an arrow 92. Then, in this state, the plate setting cam shaft 16 (see FIGS. 3A and 3B) is rotated, and the gripper side clamp base 13 is moved to the arrow 91.
When it is moved in the direction, the urging of the plate tension spring 2 in the direction of the arrow 91 is canceled by the urging of the return spring 3, and the urging force in the direction of the arrow 91 is suppressed. Therefore, the printing plate 10 is pulled with a weak tension, and a suitable tension can be applied to the printing plate 10 such as a paper plate.

(3-2) As still another embodiment of the plate setting apparatus for a printing press according to the present invention, a configuration as shown in FIG. 8B may be adopted. FIG. 8B is a plan side view of the block 9 described with reference to FIGS. 1 to 7. In the block 9 shown in FIG. 8B, a switching lever 26 is provided as an adjustment unit instead of the cam 5 and the operation bolt 6 described above. The switching lever 26 is supported by the block 9 so as to be swingable about a lever center axis 26J. Other configurations are the same as those described with reference to FIGS.

As shown in FIG. 8B, the switching lever 26
, The end of the intervening pin 4 is in contact. The portion in contact with the end of the interposed pin 4 is the point of action P of the switching lever 26.
2, the end of the switching lever 26 protruding from the upper surface of the block 9 is the power point P1. In the state shown in FIG. 8B,
The switching lever 26 swings in the direction of arrow 94 with the lever center axis 26J as a fulcrum, and the action point P2 moves in the direction away from the tail end clamp base 13 (in the direction of arrow 91).

Therefore, the intervening pin 4 is connected to the return spring 3
Is moved in the direction of the arrow 91 under the urging of the return spring 3 with respect to the clamp base 13 on the side of the tail.
The biasing force in two directions is small. Therefore, when the plate-holding cam shaft 16 (see FIGS. 3A and 3B) is rotated to move the tail-side clamp base 13 in the direction of the arrow 91, the tail-side clamp base 13 is attached to the plate-spring spring 2 (see FIG. 5A). ), The plate 10 moves strongly in the direction of arrow 91, and the edge 10b at the tail end of the plate 10 is pulled with strong tension. Therefore, a strong tension suitable for the printing plate 10 such as a PS plate can be applied.

A printing plate 1 such as a paper plate using the configuration shown in FIG.
When attaching 0 to the plate cylinder 60, the power point P1 of the switching lever 26 is moved in the direction of arrow 93 from the state shown in FIG. 8B. As a result, the switching lever 26 swings around the lever center axis 26J, and the action point P2 of the switching lever 26 moves in the direction approaching the tail end clamp base 13 (the direction of the arrow 92). Thereby, the intervening pin 4 is pressed and the return spring 3 is compressed.

In response to the compression of the return spring 3, the tail end clamp base 13 is urged in the direction of arrow 92. Then, in this state, the plate setting cam shaft 16 (FIG. 3A,
B), and the tail end side clamp base 13 is moved in the direction of arrow 91, the bias in the direction of arrow 91 by the plate tension spring 2 is offset by the bias of the return spring 3, and is moved in the direction of arrow 91. Is suppressed. Therefore, the printing plate 10 is pulled with a weak tension, and a suitable tension can be applied to the printing plate 10 such as a paper plate.

(3-3) The plate setting device for a printing press according to the present invention is not limited to the one described in the above embodiment. For example, in the above embodiment, the block 9 in which the return spring 3, the intervening pin 4, etc. are incorporated
It is fixed at 0 and immovable. However, the return spring 3, the intervening pin 4, the cam 5, the operation bolt 6 described with reference to FIGS. 1 to 7, the return spring 3, the intervening pin 4, the translation cam 25 described with reference to FIG. 8A, or FIG. The return spring 3, the intervening pin 4, and the switching lever 26 described on the basis of the above are provided in the tail-side clamp base 13, and are integrated with the tail-side clamp base 13 by arrows 9.
It may be moved in the 1,92 directions.

In this case, as in the above embodiment, the urging force of the return spring 3 with respect to the tail edge side clamp base 13 does not fluctuate due to the movement of the tail edge side clamp base 13. The biasing force can be kept constant.

In the above embodiment, the return spring 3 and the intervening pin 4 are exemplified as the restricting urging portions or the restricting spring portions. May be configured. Further, as the restriction urging unit and the tension urging unit, a mechanism that urges the second clamp unit in the loosening direction and the pulling direction using, for example, a fluid pressure may be adopted.

In the above-described embodiment, the cam 5 and the operation bolt 6, the translation cam 25, or the switching lever 26 have been exemplified as the adjusting portion. However, for example, a screw mechanism that moves in the pulling direction or the loosening direction by screwing is used. The biasing force of the limiting biasing portion or the limiting spring portion may be adjusted by adopting the provided one.

[Brief description of the drawings]

FIG. 1 is a plan view of a plate cylinder 60 provided with an embodiment of a plate stretching device for a printing press according to the present invention.

FIG. 2A is a sectional view taken in the direction of arrow II in FIG. 1;
FIG. 2B is a sectional view taken along the line II-II shown in FIG.

FIGS. 3A and 3B are sectional views taken along arrows III-III shown in FIG.

FIGS. 4A and 4B are cross-sectional views taken along arrows IX-IX shown in FIG. 3B.

5A is a cross-sectional view taken along the line IV-IV shown in FIG. 1, and FIG. 5B is a cross-sectional view taken along the VV direction shown in FIG.

6A is a sectional view taken along the line VI-VI shown in FIG. 1, and FIG. 6B is a sectional view taken along the line VII-VII shown in FIG.

FIG. 7 is a sectional view taken in the direction of arrows VIII-VIII shown in FIG.

FIG. 8A is a diagram showing another embodiment, and FIG.
B is a view showing still another embodiment, and is a side sectional view of a block 9.

FIG. 9 is a partial cross-sectional view schematically showing a conventional plate cylinder 60.

FIG. 10 is a partial sectional view showing a conventional plate cylinder 60.

[Explanation of symbols]

 2 ···· Plate tension spring 3 ··· Return spring 4 ··· Interposition pin 5 ··· Cam 6 ··· Operation bolt 6J ··· Rotation axis 10 · ··· Printing plate 10a ····························································· Side clamp 25 Linear cam 26 Switching lever 60 Plate cylinder 62 Clamp base clamp 64 Clamp clamp

Claims (3)

[Claims] A first clamp provided on the plate cylinder for fixing a first end of the printing plate; a first clamp provided on the plate cylinder; the first end fixed to the first clamp; The second of the printing plate wound around the outer peripheral surface of the plate cylinder
A second clamp portion for fixing an end portion, the second clamp portion being movable in a pulling direction in which the printing plate is in close contact with the outer peripheral surface of the plate cylinder, or in a loosening direction in which the printing plate is not in close contact with the outer peripheral surface of the plate cylinder.
A clamp portion, a pulling biasing portion for biasing the second clamp portion in the pulling direction, a limiting biasing portion for biasing the second clamp portion in the loosening direction, and adjusting a biasing force of the limiting biasing portion with respect to the second clamp portion. A plate-setting device for a printing press, comprising: an adjusting unit. 2. The plate setting device for a printing press according to claim 1, wherein the restricting urging portion is a restricting spring portion formed by a spring, and the restricting spring portion is a contact surface of the second clamp portion. When,
The contact surface of the adjustment portion is located between the contact surface of the adjustment portion and the contact surface of the adjustment portion approaches or separates from the contact surface of the second clamp portion. A plate setting device for a printing press, wherein the biasing force is adjusted. A first clamp portion provided on the plate cylinder for fixing a first end portion of the printing plate; a first clamp portion provided on the plate cylinder, the first end portion being fixed to the first clamp portion; The second of the printing plate wound around the outer peripheral surface of the plate cylinder
A second clamp portion for fixing an end portion, the second clamp portion being movable in a pulling direction in which the printing plate is in close contact with the outer peripheral surface of the plate cylinder, or in a loosening direction in which the printing plate is not in close contact with the outer peripheral surface of the plate cylinder.
A clamp portion, a tension spring portion for urging the second clamp portion in the tension direction, a limiting spring portion for urging the second clamp portion in the loosening direction and canceling the tension in the tension direction by the tension spring portion, the second clamp A cam adjustment unit configured to adjust the biasing force of the limiting spring unit with respect to the unit, the cam adjustment unit including a rotation operation unit and a cam whose eccentric position is fixed to a center axis of the rotation operation unit. The limit spring portion is located between the contact surface of the second clamp portion and the cam surface of the cam provided in the cam adjustment portion. The cam surface approaches or separates from the abutment surface of the second clamp portion, and the cam surface approaches or separates from the abutment surface of the second clamp portion. Force The press is adjusted, and the urging force of the tension spring in the pulling direction of the second clamp is adjusted by adjusting the urging force of the limiting spring with respect to the second clamp. Plate setting equipment.