JP3028404B2 - Printing plate quick clamping device for plate cylinders for rotary presses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate quick clamping device for a plate cylinder for a rotary press.

[0002]

2. Description of the Related Art For example, as a plate clamping device for an offset rotary press, a plate quick clamping device in which the edge of the plate is hooked by a hook-shaped hook member to easily clamp the plate is used. It is commonly used because of its simplicity.

This conventional plate quick clamping device is shown in FIG. 1, in which a hook bar d formed by a leaf spring into a hook shape is attached to a clamp bar c inserted into a slot b of a plate cylinder a. Is fixed, and the gripping end g of the printing plate f inserted from the groove e is hooked on the hooking member d, and then the clamp bar c is rotated in the gripping direction (left rotating direction in the drawing) by a toggle mechanism. It can be clamped.

[0004] In this conventional plate quick clamping device, the relationship between the rotation direction of the plate cylinder a and the holding direction of the clamp bar c is determined, and the rotation direction of the plate cylinder a is set to the right in FIG. In the case of rotation, the gripping direction of the clamp bar c is counterclockwise rotation, and the printing plate f is always rotated with the gripping side h as the head (the head in the rotation direction).

[0005]

As described above, in the above-mentioned conventional plate quick clamping device, the holding direction is determined by the rotation direction of the plate cylinder a, and the plate cylinder a can be used in reverse. Did not.

[0006] This is a structure in which the edge g of the printing plate f is simply bent and the edge of the plate f is hooked on the hook member d. The printing plate f is a thin aluminum plate having a thickness of 0.2 to 0.24 mm (P
When the (S plate) is used, the bent portion of the holding edge g of the printing plate f loses the pulling force of the printing plate f at the time of printing and cannot be clamped. As a result, the holding portion of the printing plate f There is a danger that the print quality will rise and the print quality will deteriorate, and in severe cases, the printing plate will break, or the printing plate will fall off during printing.

For this reason, conventionally, in the case of a reversing plate cylinder, a clamp-up type clamping device having a clamping groove in a clamping bar or a plate quick clamping device in which the gripping direction is reversed must be used. It has not been possible to use a common plate cylinder for a front-back double-sided printing press in which printing is performed by mixing a plate cylinder that rotates forward and a plate cylinder that reverses rotation.

FIG. 2 shows a front-and-back double-sided printing machine having one back-printing reverse rotation unit A and a plurality of front-printing normal rotation units B ₁ , B ₂ , and B ₃ . rotary printing paper D is reverse printing in the plate cylinder a ₁ to reverse the this by reversing the reverse printing reversing unit a, then reversed to enter the table printing forward unit _{B 1, B 2, B 3} , wherein each unit The multicolor printing is performed on the surface of the rotary paper D by the plate cylinders a ₂ , a ₃ , and a _{4 that} rotate normally.

[0009] In the case of such a both sides printing machine, since the conventional printing plate quick clamping device can not be used on the plate cylinder a ₁ in the reverse printing reversing unit A for the reasons described above, the plate cylinder a of the unit A ₁ to other units B ₁ ,
The plate cylinders a ₂ , a ₃ , and a _{4 of} B ₂ and B ₃ could not be shared, and there was a problem in cost.

The present invention has been made in consideration of the above, and can be used irrespective of the rotation direction of the plate cylinder. Therefore, the present invention can be applied to a rotary press in which a forwardly rotating plate cylinder and a reversely rotating plate cylinder are mixed. An object of the present invention is to provide a printing plate quick clamping device for a plate cylinder for a rotary press in which each plate cylinder can be used in common with respect to the apparatus.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a printing plate quick clamping device for a plate cylinder for a rotary press according to the present invention is provided with a shaft in a slot provided in the axial direction near the surface of the plate cylinder. Insert a clamp bar with a hooking member protruding on the right-angled side surface, hook the gripping edge of the printing plate with the gripping side hooked on one edge of the slot into the hooking member of the clamp bar, and In a printing plate quick clamping device for a rotary press plate cylinder in which a clamp bar is rotationally fixed in a direction in which the holding butt is pulled in, the gripping side of the printing plate holds each shape on both sides of the groove of the slot. Shape
A hook member projecting from the clamp bar is formed in a T-shaped cross section having projecting pieces projecting to both sides in the rotation direction of the plate cylinder, and a clamp arm fixed to an end of the clamp bar and a plate cylinder side are clamped. A toggle rod with one end connected to the arm,
A support member to which the toggle rod is slidably fitted and supported on the plate cylinder side; and a toggle spring interposed between the toggle rod and the support member to cause the toggle rod to perform a toggle action on the support member. And a stopper for restricting the rotation posture on both sides in the rotation direction of the clamp arm by the toggle mechanism during rotation of the clamp arm.
Approximately both sides in the diameter direction with respect to the core, and the tip is a member on the plate cylinder side
At the same time, make the protrusion length to the shaft member side variable
The configuration is provided .

[0012]

[Operation] The gripping side of the printing plate is hooked on the edge on either side of the slot, and the gripping end is hooked on the hooking member of the clamp bar on either side in the rotation direction of the plate cylinder.
Thus, the printing plate can be mounted so that the mounting direction thereof is always the head by adjusting the mounting direction of the printing plate to the rotation direction of the plate cylinder. The rotation angle of the clamp bar in the clamping direction at this time is regulated by a stopper that regulates the rotation posture of the clamp arm by the toggle mechanism , and the tip of the clamp bar contacts the member on the plate cylinder side . Ru is stopped at the position. This stopping posture can be changed more by changing the length of protrusion of the stopper.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a plate cylinder, and reference numerals 2a and 2b denote bearers along both side ends of the plate cylinder 1. Reference numeral 3 denotes a groove provided in the axial direction near the surface of the plate cylinder 1. The cross-sectional shape of the groove 3 is such that a groove 4 opening on the surface of the plate cylinder 1 and a bottom portion facing the groove 4 are circular. It has a shape having a clamp bar receiving portion 5 and inverted tapered holding edges 6 a and 6 b symmetrical on both sides from both side surfaces of the clamp bar receiving portion 5 to the edge of the groove 4.

Reference numeral 7 denotes a clamp bar inserted into the slot 3. The clamp bar 7 is rotatably fitted to the clamp bar receiving portion 5 of the slot 3. Has a cutout circular shape having a cutout surface 8 by cutting out about 1/4. A hook member 9 having a T-shaped cross section is implanted in the notch 8.

Both ends of the clamp bar 7 are bearers 2
a, 2b, and clamp arms 10, 10 are fixed to the respective ends 7a, 7b. The clamp arm 10 is connected to the bearers 2a and 2b via a toggle type quick clamp operating device 11.

As shown in FIG. 5, the quick clamp operating device 11 includes arms 12 and 12 projecting from both sides of the clamp arm 10 in the direction perpendicular to the axis .
The toggle rod 13 is rotatably supported by a toggle rod 13 having one end rotatably connected to one arm 12 and a bracket 14a fixed to the bearers 2a and 2b.
3 comprises a support member 14 slidably fitted therein and a toggle spring 15 interposed in the axial direction between the support member 14 and the toggle rod 13.

The center of rotation of the clamp arm 10 is O ₁ , the connecting point of the toggle rod 13 is O ₂ , the support member 14
The center of rotation O ₂ when the O ₃ is, O ₁ and O ₃ bearers 2a beyond a straight line connecting the, to move radially outward and the inner diameter side of the 2b, the biasing force of the toggle spring 15, respectively The clamp arms 10 rotate in opposition to each other, and the postures in the respective rotation directions are determined by the arms 12 , 1 located on both sides in the rotation direction.
The stoppers 16a and 16b provided on the shaft 2 come into contact with the shaft member 17 so as to be shimmered.

Screws are used for the stoppers 16a and 16b, and the turning posture of the clamp arm 10 can be adjusted by changing the length of protrusion. And Each stopper 16a, 16 b are adapted to loosening is Tomera by pushing from the lateral direction at set screw 20, 20.

The toggle spring 15 of the clamp arm 10
Is performed by inserting a rod into a hole 10a provided in the boss portion of the clamp arm 10 in a direction perpendicular to the axis and rotating the rod.

FIGS. 6 to 9 show the state of use in the above configuration.
It will be explained in. 6 and 7 show the case where the plate cylinder 1 rotates forward (to the right). In this case, the printing plate 18 hooks its gripping side 18a on the gripping edge 6a on the downstream side in the rotation direction.
Further, the clamp arm 10 is rotated to the upstream side in the rotation direction of the plate cylinder 1 after the gripper 18b is hooked on the upstream side in the rotation direction of the plate cylinder 1 of the T-shaped hooking member of the clamp bar 7.

In this state, the printing plate 18 rotates with the gripping side 18a serving as a head, and no force acts on the gripping butt 18b. Are combined.

FIGS. 8 and 9 show the case where the plate cylinder 1 rotates in the reverse direction (to the left). In this case, the operation is the reverse of the above-mentioned normal rotation. It is hooked on the projection on the opposite side to the case of normal rotation.

In mounting the printing plate 18 in each of the above directions, the tension of the printing plate 18 is applied to the stoppers 16a, 16a.
It is adjusted by changing the maximum rotation angle of the clamp arm 10 at b.

In the above embodiment, the adjustment of the maximum rotation angle of the clamp arm 10 is performed by the stoppers 16a and 16b provided on both sides in the rotation direction of the clamp arm 10. However, as shown in FIG. The stopper 19 may be fixed to the tip of the rod 13a so as to be adjustable in the length direction, and the maximum rotation angle of the clamp arm 10b in both directions may be set by setting the maximum length of the toggle rod 13a.

As described above, the hook member 9 is formed in a T-shaped cross-section and protrudes on both sides in the rotation direction of the plate cylinder 1. As shown in FIG. May be planted back to back. The clamp arms 10, 10 for rotating the clamp bar 7 are provided.
b and the quick clamp operating device 11 may be provided only on one side of the plate cylinder 1.

[0026]

According to the present invention, even if the rotation direction is changed in the same plate cylinder 1, the gripping side 18a of the printing plate 18, which is always hooked on the edge of the plate cylinder 1, is placed on the head side. In addition, the holding butt 18b , which is pulled by the clamp bar 7, can be set to the butt side.

Therefore, even in a rotary press in which a forward rotating plate cylinder and a reverse rotating plate cylinder are mixed, each plate cylinder can be shared by a plate cylinder using the same plate quick clamping device.

According to the invention, the length of protrusion of the stopper is also provided.
Change the posture of the clamp arm.
To determine the angle of rotation of the clamp bar in the winding direction
It can be performed. And the stopper is a clamp
Is provided on both sides in the diameter direction with respect to the rotation center of the arm.
By adjusting the length of each stopper,
This can be done individually on both sides with respect to the center of rotation of the system.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a conventional plate quick clamping device.

FIG. 2 is an explanatory diagram showing a front and back double-sided printing rotary offset press.

FIG. 3 is a cross-sectional view showing an embodiment of a main part of the plate quick clamping device according to the present invention.

FIG. 4 is a cross-sectional view showing a quick clamp operating device section of the printing plate quick clamp device.

FIG. 5 is a front view showing a quick clamp operating device section of the printing plate quick clamp device.

FIG. 6 is a cross-sectional view showing a clamped state when the plate cylinder rotates in the reverse direction.

FIG. 7 is a front view showing an operating state of the quick clamp operating device when the plate cylinder rotates in the reverse direction.

FIG. 8 is a sectional view showing a clamped state when the plate cylinder rotates forward.

FIG. 9 is a front view showing an operating state of the quick clamp operating device when the plate cylinder rotates forward.

FIG. 10 is a front view showing another embodiment of the quick clamp operating device.

FIG. 11 is a sectional view showing another embodiment of the hook member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plate cylinder, 2a, 2b ... Bearer, 3 ... Slot, 4 ... Groove, 5
... Clamp bar receiving parts, 6a, 6b ... Holding edges, 7
... Clamp bar, 9 ... Hooking member, 10, 10b ... Clamp arm, 11 ... Quick clamp operating device, 12 ...
Arm, 13, 13a: toggle rod, 14: support member, 14a: bracket, 15: toggle spring, 16a,
16b, 19: stopper, 17: shaft member, 18: printing plate.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-20607 (JP, A) JP-A-60-12441 (JP, U) JP-A-4-45736 (JP, U) JP-A-63 130229 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 27/12

Claims (1)

(57) [Claims] 1. A clamp bar having a hook member projecting from a side surface perpendicular to an axis is inserted into a groove provided in an axial direction near a surface of a plate cylinder, and a gripping side is hooked on one edge of the groove. A plate quick-clamping device for a plate cylinder for a rotary press, wherein a gripper of a printing plate is hooked on a hook member of the clamp bar, and the clamp bar is rotated and fixed in a direction in which the gripper is pulled in. In each of the above, the shape of each side of the groove of the slot is shaped so that the grip side of the printing plate is hooked, and a hook member projecting from the clamp bar is provided with a projecting piece projecting to both sides in the rotation direction of the plate cylinder. A clamp arm fixed to the end of the clamp bar and a plate cylinder side, a toggle rod having one end connected to the clamp arm, the toggle rod slidably fitted, and Support supported on the plate cylinder side Wood and concatenates the toggle rod against interposed has been supporting member with a toggle mechanism comprising a toggle spring toggles acts between the toggle rod and the support member, rotating opposite sides of the clamp arm by the toggle mechanism The stopper that regulates the rotation posture of the clamp arm
A member on the side of the plate cylinder, with the tip at approximately both sides in the diameter direction relative to the center.
And the length of protrusion to the shaft member side is variable.
Plate of a rotary machine plate cylinder, characterized in that provided Te quick clamping device.