Punch for film products having improved slug removal facility

Claim 1

In combination with a punch assembly for perforation of flexible film products with cooperatively arranged punch and die assemblies, and means for ejecting film slugs from said punch means; pneumatic punch drive means and control means for said punch drive means and said film slug-ejecting means: a. said punch assembly including frame means for retaining a reciprocating punch and a stationary die, a punch assembly including a punch member mounted on said frame means and including drive means for stroking said punch member in reciprocatory to-and-fro motion for extension and retraction thereof along a certain linear path; b. a die-assembly mounted on said frame means and having a punch-receiving bore formed therein; c. said pneumatic punch drive means comprising a double acting cylinder with a piston and ram operatively associated therewith, axially spaced port means for introducing compressed gaseous fluid into said cylinder including a first port for drivably extending and a second port for drivably retracting said piston and ram; d. said film slug-ejecting means comprising slug-ejection port means on said punch means for receiving compressed gaseous fluid and delivering said compressed gaseous fluid to the interior of said punch means for ejection of film slugs outwardly of said punch means; e. said control means comprising manifold means for receiving compressed gaseous fluid under pressure, first control valve means having an inlet coupled to said manifold means and having a pair of outlets alternately coupled to said inlet and including a normally open and a normally closed outlet with said normally open outlet having conduit means coupling said normally open outlet to said second cylinder port and with said normally closed outlet having conduit means coupling said normally closed outlet to said first cylinder port; f. second control valve means having an inlet coupled to said manifold means and having an outlet port intermittently coupled to said inlet port with conduit means coupling said outlet port to said slug-ejecting port means; and g. first control valve timing means for controllably actuating said first control valve means to simultaneously close said normally open outlet port and open said normally closed outlet port for ram extension; and h. second control valve timing means for controllably actuating said second control valve means to intermittently couple said second control valve means inlet port to said second control valve means outlet port.