Movable gripper for stretch film packaging machines

Details Movable gripper for stretch film packaging machines Movable gripper for stretch film packaging machines

2006-12-26

2006-12-26

Gerrity, Stephen F. (Department: 3721)

Package making

Apparatus for contraction of cover by stretching or shrinking

C053S441000, C053S228000

Reexamination Certificate

active

07152388

ABSTRACT:
An upper jaw of the gripper is provided posteriorly to a fulcrum shaft, with opposed portions for a double effect cooperation with an eccentric element keyed on the shaft which controls the orientation of the gripper. The opening and closure movement of the gripper, in an appropriate phase of the distributor (D) of the film, is ensured by the cooperation of a roller of an action lever of the fulcrum shaft with a cam-function lever, horizontally fulcrumed with one end of a support fixed to the frame of the machine and provided on the other end with a trigger and hook device which, when actuated by the roller, deactivates and allows the lifting of the lever via an elastic return device. Subsequent to the lifting, the gripper closes and grasps the film from the distributor. During the opposite displacement run of the gripper from the distributor, a cam fixed to the carriage with the gripper, co-operates with a lateral arm of the lever with the function of cam, and causes the lowering of the latter in the original position, with re-loading of the relative trigger and hook device.

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