Non-repeat doctor blade drive
AssigneeMotter Printing Press Co.
InventorRalph A. Yessler, II
Life of this patent
Estimating the term…
Abstract
A drive for the doctor blade of a gravure type printing press oscillates the doctor blade in a non-repeating motion. A doctor slide is coupled to the doctor blade, and oscillated on the frame by a first piston-cylinder unit. A pneumatic valve slide is driven back and forth on the frame by a second piston cylinder unit, between a first pair of end stops mounted on the doctor slide and between a second pair of end stops mounted on the frame. Upon engagement of the end stops on the doctor slide, the valve slide provides a pressure signal to reverse the direction of motion of the doctor slide. Upon engagement of the end stops on the frame, the valve slide provides a pressure signal to reverse its own direction of motion on the frame.
Claims26
In a printing press having a frame, a printing cylinder, a press drive, and a doctor blade engaging a surface of said cylinder and longitudinally displaceable along said cylinder, a drive for oscillating said doctor blade along said cylinder in a non-repeat motion comprising:
- (a) a doctor slide coupled to said doctor blade and mounted on said frame to be moveable in said longitudinal direction;
- (b) first drive means arranged between said doctor slide and said frame for moving said doctor slide back and forth in said longitudinal direction;
- (c) reference indicia means comprising first reference indicia, second reference indicia, and means for moving one of said reference indicia back and forth relative to the other;
- (d) a control member;
- (e) second drive means for moving said control member back and forth relative to said reference indicia;
- (f) means for actuating said first drive means including a first control means independent of said press drive and responsive to the position of said control member relative to one of said first reference indicia and said second reference indicia for controlling the actuation of said first drive means for reversing the direction of movement of said doctor slide;
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- (g) second control means responsive to the position of said control member relative to the other of said first reference indicia and said second reference indicia for actuating said second drive means for reversing the direction of movement of said control member.
A drive for oscillating the doctor blade of a gravure type printing press having a press drive in a non-repeat motion comprising:
- (a) a frame;
- (b) a doctor slide mounted on said frame to be moveable in a longitudinal direction, wherein said doctor slide is adapted to support a doctor blade thereon;
- (c) first drive means arranged between said doctor slide and said frame for moving said doctor slide back and forth in said longitudinal direction;
- (d) reference indicia means comprising first reference indicia, second reference indicia, and means for moving one of said reference indicia back and forth relative to the other;
- (e) a control member;
- (f) second drive means for moving said control member back and forth relative to said reference indicia;
- (g) means for actuating said first drive means including a first control means independent of said press drive and responsive to the position of said control member relative to one of said first reference indicia and said second reference indicia for controlling the actuation of said first drive means for reversing the direction of movement of said doctor slide;
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- (h) second control means responsive to the position of said control member relative to the other of said first reference indicia and said second reference indicia for actuating said second drive means for reversing the direction of movement of said control member.
A method of operating a printing press having a frame, a press drive, a printing cylinder mounted to said frame, a press drive, a doctor blade, and a doctor slide supporting said doctor blade and mounted on said frame for moving said doctor blade in a longitudinal direction relative to said cylinder, comprising the steps of:
- (a) establishing a first pair of spaced reference indicia;
- (b) establishing a second pair of spaced reference indicia;
- (c) locating a control indicia means between the reference indicia of said first pair and between the reference indicia of said second pair for moving between the reference indicia of each respective pair;
- (d) moving simultaneously said doctor slide in said longitudinal direction relative to said frame, said first reference indicia relative to said second reference indicia, and said control indicia means relative to said reference indicia wherein the movement of said doctor slide and said indicia is independent of said press drive;
- (e) reversing the direction of movement of said control indicia means upon each engagement of said control indicia means and a reference indicia of one of said first pair and said second pair;
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- (f) reversing the direction of movement of said doctor slide upon each engagement of said control indicia means and a reference indicia of the other of said first pair and said second pair.
Dependencies are inferred from the claim text.