Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Prong operable intermittently to prevent longitudinal...
Patent
1975-12-05
1977-04-05
Schacher, Richard A.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Prong operable intermittently to prevent longitudinal...
226 67, 226114, 226143, 226147, B65H 1740
Patent
active
040157636
ABSTRACT:
A hitch feed assembly for automatically aligning individual lead frames at a bonding site in both the longitudinal and lateral directions is disclosed. The alignment is attained as a result of the cooperation between a plurality of chamfered pawls and the sprocket holes in the film-carrier. The pawls are chamfered along three sides in order to attain alignment in both the longitudinal and lateral directions. Significantly, the pawls come into operational contact with the sprocket holes while the lead frame film-carrier is under minimal tension so that the pressure exerted on the edges of the sprocket holes by the pawls will be minimal, thereby avoiding any deformation in the shape of the sprocket holes.
REFERENCES:
patent: 1144414 (1915-06-01), Holmes
patent: 1984143 (1934-12-01), Kraft
patent: 3836060 (1974-09-01), Steinberger
patent: 3900257 (1975-08-01), Wooley
Schacher Richard A,.
The Jade Corporation
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