Patent ID: 6109423
Filing Date: 2000-08-29
Classification: B21D

Abstract:
A feed stroke varying apparatus for a transfer feeder for use in a transfer press having a plurality of work stations in a press machine body, the transfer feeder having a plurality of cross bars arranged spaced apart from one another in a feed direction and operative to move two-dimensionally by a feed means and a lift means, and an attractive means carried by each of the cross bars for attractively holding a workpiece and movable therewith for transferring the workpiece into and from one of the work stations to another sequentially, the feed stroke varying apparatus comprising:a pair of lift beams adapted to be raised and lowered by said lift means;a plurality of cross bar carriers carried spaced apart from one another by said pair of lift beams in the feed direction and each constructed of a principal carrier and a subsidiary carrier both suspended from lower sides of said lift beams so as to be capable of reciprocating;a coupling means for interconnecting the principal carriers;a link member for connecting to said feed means one of said principal carriers which is located at a most upstream side thereof;a feed stroke changing means arranged between a said principal carrier and a said subsidiary carrier for changing a relative distance therebetween to alter a stroke of feed performed by said cross bars; anda control means for controlling an operation of said feed stroke changing means,each of said cross bars being detachably bridged across a pair of said subsidiary carriers opposed to each other,said feed means being adapted to reciprocate said cross bars in the feed direction,said feed stroke changing means being adapted to alter the feed stroke of said cross bars.