Alignment pawl for film-carrier advance mechanism

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 pawl...

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Bibliographic Details
Main Author KEIZER; ALAN S
Format Patent
LanguageEnglish
Published 05.04.1977
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary: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.
Bibliography:Application Number: US19750637921