Selective sucker arm liftoff

Details Selective sucker arm liftoff Selective sucker arm liftoff

1991-03-14

1992-06-09

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Separators

271100, 271106, 271256, 271275, B65H 308

Patent

active

051200414

ABSTRACT:
In order to avoid striking and compacting signatures in a signature stack during a period of selective operational disablement of a gathering machine on a binding line, a system for selectively disabling and enabling operation of a sucker arm is provided. The system includes a cam operatively associated with a main drum for driven movement therewith and a cam follower arm operatively associated with the cam for driven movement thereby. The cam follower arm is interconnected to the sucker arm for imparting reciprocating movement to the sucker arm. The reciprocating movement normally traverses a path from the signature stack to the main drum and back again to feed signatures from the signature stack to the main drum for delivery to the binding line when the system enables operation of the sucker arm. The cam follower arm is interconnected to the sucker arm through a pushrod which extends to a crank mounted on a pivotal sucker tube for pivotal movement thereabout. The system is such that the sucker arm is mounted on the sucker tube whereby pivotal movement of the crank imparts reciprocating movement to the sucker arm. In order to accomplish the objectives of the invention, a mechanism is provided for varying the length of the pushrod on demand between a normal length and an extended length to alter the path of reciprocating movement to disable the sucker arm from its normally intended function.

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