The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1992
Filed:
May. 15, 1991
Martin Imlig, Oberarth, CH;
Andreas Steiger, Zug, CH;
Esec, SA, Cham, CH;
Abstract
A method and apparatus for transferring relatively thin, strip-like workpieces, such as metal leadframe strips to at least one processing or bonding station are proposed. The apparatus essentially comprises a transfer mechanism, a processing or bonding station, an electromotive drive, a first and a second group of electromagnetically, pneumatically or hydraulically operable clamping elements. The first group of the clamping elements is movable relative to the second group of clamping elements fixed to a main carrier of the transfer mechanism. In a first phase of the transfer and feed movement, the electromotive drive is controlled by means of reference geometry data given in dependence upon a particular leadframe and in a second phase of the feed movement by means of dynamic, opto-electronically measured reference data and pulses formed therefrom. The supply movement of the leadframe to the processing or bonding station takes place in a transfer direction (X') at an angle (.alpha.) displaced in a side and plane relative to the main carrier.