Package making – With means responsive to a sensed condition – Of package and filled receptacle closing or opening
Patent
1996-05-20
1997-08-05
Culver, Horace M.
Package making
With means responsive to a sensed condition
Of package and filled receptacle closing or opening
53550, 533745, B65B 920, B65B 5130, B65B 5700
Patent
active
056530854
ABSTRACT:
The present invention is intended to effect proper sealing of a film by automatically adjusting the gripping pressure exerted by seal bars on the basis of a change in unsteady current flowing through the seal bars which grip the film. When the main shaft of a servomotor mounted on a frame is rotated forward and backward, the pair of seal bars opens and closes. When the seal bars press each other, the film is gripped under pressure by these seal bars and heat-sealed. Cushion means for elastically pressing the seal bars increases the gripping pressure of the pair of seal bars in proportion to an increase in the angle of rotation of the motor main shaft after the opposed surfaces of the seal bars have contacted each other. A controller decreases the sealer gripping pressure when the current is high and produces a large amount of heat in filaments stuck to the opposed surfaces of the seal bars but increases the sealer gripping pressure when the current is low and produces a smaller amount of heat in the filaments.
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Culver Horace M.
Ibaraki Seiki Machinery Company, Ltd.
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