Patent GB-730321-A (GB)
Title: Improvements in or relating to blank transfer mechanism for heading or upsetting machines
IPC: B21K27/04
Filed: 1953-02-06
Abstract: 730,321. Forging nuts and bolts. WATERBURY FARREL FOUNDRY & MACHINE CO. Feb. 6, 1953 [May 21, 1952], No. 3398/53. Class 83 (4). Blanks, transferring.-Blank transfer mechanism for a heading or upsetting machine, in particular a nut or bolt forming machine, having a number of parallel die stations 13-17, comprises gripping fingers 43, mounted on a reciprocating slide 28, means for rotating the fingers about an axis substantially at -right angles to the axes of the dies so as to reverse the blank during its transfer, and means for swinging the slide about an axis parallel to its reciprocating movement to enable the fingers during their rotation to clear the die stations. Two sets of rotatable fingers 43, Fig. 2, and two sets of non-rotatable fingers 33, which transfer the blank without reversal, are mounted on the common slide 28 which is reciprocated, transversely of the dies axes, by a pair of complementary cams 57, 58, Fig. 1, which effect positive movement to the slide in both directions through linkage 62, 66, 64, 70, 72, 76, 77, 78, 79, 80. An adjusting screw 74 on the link 72 varies the stroke of the slide, and nuts such as 90 limit the stroke in both directions. The slide is mounted on a dovetail portion 25, Fig. 4, of a carrier 24 pivoted on a spindle 23. The fingers 43 are secured to a slotted finger bar 42 pivoted at 41 to a holder 40 and held in an adjusted position by screws 44. The holder 42 is carried by a spindle 39, rotatable in a block 37 adjustably mounted on the slide 28 by adjusting screws 119 and clamping screws 121, Fig. 2. At its upper end the spindle 23 carries a pinion 45 meshing with a rack 47 mounted on the carrier 24 so that as the slide 28 reciprocates relative to the carrier the pinion 45 and hence the fingers 43 are rotated through 180 degrees to reverse the blank gripped thereby. The fingers 33 are pivoted at 32, Fig. 2, to a holder 30 adjustably mounted on the slide 28; these fingers have arms 34 which are pressed outwardly by spring-loaded plungers 35. For moving the fingers away from the face of the dies, the carrier 24 is rocked positively about the spindle 23, in timed relationship with the reciprocation of the slide, by a pair of cams 109, 110, Fig. 1, secured to the reciprocating crosshead 11 of the machine which carries the forging tools. These cams are complementary to each other for positively rocking the fingers in both directions through a rocker arm 103, on a shaft 104, and linkage 102, 99, 98, 94, 92. An adjusting screw 101 varies the extent of rocking movement. The spindle 23 is carried by a bracket 20, Fig. 4, pivoted on a spindle 21 carried by the common die block 12, and by releasing a clamp 50 the transfer mechanism may be swung through 90 degrees about the spindle 21 thus raising the fmgers to an accessible position above the dies. A lifting handle 124 is provided. In another embodiment the spindle 21 is omitted and the mechanism may be swung through 90 degrees about the spindle 23 which is carried by a bracket adjustably mounted, for movement in the direction of the die axis, on the die block 12.