Claims
- 1. A quick release printing plate retaining apparatus for holding a printing plate on the surface of a plate cylinder comprising:
- a first fixed groove in the cylindrical surface of the plate cylinder and oriented parallel to the axis of the plate cylinder into which fits a lip bent on the edge of a printing plate;
- a segment of the cylindrical surface of the plate cylinder with a reduced radial dimension forming a depressed surface;
- a moveable retainer bar including a second groove, into which fits a lip bent on the edge of a printing plate, parallel to the first fixed groove, the moveable retainer bar located within the depressed surface of the plate cylinder;
- force producing means acting upon the moveable retainer bar to move it toward the first fixed groove and to maintain clearance space within the depressed surface on the side of the retainer bar away from the fixed groove;
- an actuator bar located within the depressed surface of plate cylinder between the moveable retainer bar and the fixed groove and oriented approximately parallel to the plate cylinder axis;
- at least two pair of wing means angularly oriented at complimentary angles to the axis of the plate cylinder and pivotably attached to the actuator bar, each pair having one wing means protruding toward the retainer bar and pivotably attached to it and another wing means protruding toward the first fixed groove and pivotably attached to a fixed surface; and
- actuating means capable of producing a force on the actuator bar in the direction parallel to the axis of the plate cylinder from the direction of the apex of the angles formed by the wing means.
- 2. The printing plate retaining apparatus of claim 1 wherein the actuating means is a pneumatic cylinder whose piston produces the force on the actuator bar, but which does not contact the actuator bar when not producing the force so as not to interfere with the rotation of the plate cylinder.
Parent Case Info
This is a division of application Ser. No. 877,239 filed Jun. 23, 1986, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3869985 |
Steinmetz |
Mar 1975 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
877239 |
Jun 1986 |
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