GB548366A - Improvements in or relating to header or upsetting machine - Google Patents

Abstract

548,366. Heading machines. WILCOX, R. L., and WATERBURY FARREL FOUNDRY & MACHINE CO. April 29, 1941, No. 5539. [Class 83 (iv)] The header slide 12 carries punch slides 18, 19 movable simultaneously at or near the end of the retracting stroke to change the punches that are in operative relation with the dies 14. The punch slides are guided by dovetail side gibs 17 and a central rectangular gib engages grooves in each slide. Downward movement is limited by bolts 54 with nuts 53 and upward movement by screw 52, and is imparted by a pair of back levers 42 linked one to each slide and acted on by pairs of spring plungers 45 carried by a cradle from the header slide and rocked by linkage 37, 36, 34, 31 from a cam 30. The link 31 is guided by a sliding engagement with a block 32 loose on the cam shaft. When the punch slides are arrested, the spring plungers allow a slight further movement of the cradle so that the levers 42 are held in their rocked positions by plungers acting on one side only nuts 49 maintaining the plungers acting on the other sides inoperative. The heading mechanism can be employed in various ways :-with two independent rod feeds to produce two blanks at each pair of strokes ; to produce trimmed heads of polygonal shape, a cylindrical head is produced in two blows by one slide, the blank is hammered to the second die in which the head is finished and ejected through the trimming die ; to produce blanks from oversize wire, the shank is extruded in the first die and the unextruded portion is upset in the second die ; blanks may be headed in three blows the second blow of the second slide effecting the trimming ; or heads requiring four blows may be produced.