Patent GB-687866-A (GB)
Title: Improvements in or relating to machines for drawing wire or the like
Inventor: MARTINEZ MARIO
IPC: B21C1/14
Filed: 1950-05-15
Abstract: 687,866. Drawing wire. BARRON & CROWTHER, Ltd. May 4, 1951 [May 15, 1950], No. 12104/50. Class 83 (iv). A multi-draw machine for drawing wire or the like comprises rotary means for drawing wire from a preceding die or the like and delivering it to a succeeding die or the like, the rotary means comprising a pair of coaxially disposed blocks in combination with a guide for leading wire from the first block of said pair to the second one, the said guide being rotatably mounted on a carrier which is itself rotatable about the axis of rotation of the blocks. A wire drawing machine comprises a number of double block assemblies on a bed 1, die stands 6 and a coiling unit 7, the wire 8 passing through a die stand to the lower block 3 of the next block assembly, over an associated guide pulley 4 rotatably mounted on a carrier ring 5 rotatable about the axis of the blocks, to the upper block 2 of the assembly, thence over pulleys 9 to the next die stand or coiler unit. The direction in which the wire is wound round each upper block is opposite to that in which it is wound round the associated lower block. The lower block 3 of each assembly is keyed to a spindle 12 driven through worm gearing by a motor 10. A hand wheel 42 permits the block 3 to be rotated by hand and also contains a ratchet device to prevent reverse rotation of the block. The carrier ring 5 is journalled on a sleeve 16 on the spindle and carries a brake drum 17 co-operating with spring-loaded adjustable brake shoes 18 in the lower block. The upper block 2 is journalled on a sleeve 20 on the spindle. Ducts 40, 151 permit water cooling of the assembly and lubrication of bearings respectively. During normal operation each lower block is positively rotated to draw wire, each upper block is rotated oppositely by tension in the wire being drawn therefrom and the carrier 5 rotates at a speed equal to half the algebraic sum of the speeds of the associated blocks. For varying the accumulation of wire on the blocks the drive to the lower block may be switched off or a two speed motor may be used. Automatic variation of the speed may be effected by the use of limit switches 29, 30, Fig. 7, actuated by a member 24 on a lead screw 23 rotated step by step by a finger 27 on the guide carrier, one limit switch switching, through a relay, the associated motor to " on " or " fast " and the other switching the motor to " off " or " slow ". In a modification, Fig. 6, the carrier 5 is coupled through an adjustable friction drive 32 to a spider 33 which is coupled through a number of pairs of planet wheels 36, 37 which engage gear wheels 38, 39, on the upper and lower blocks respectively. The gear ratio is such that the spider rotates at a speed slightly faster than half the algebraic sum of the speeds of the blocks, i.e. slightly faster than the carrier 5, and the friction coupling accommodates irregularities due to slipping wire &c. A single motor may drive all the blocks through clutches and gearing and the second block of each assembly may also be positively driven and have associated braking means. In the case where the winder unit comprises a double block assembly the second block is driven at a speed which causes wire to be collected at a faster rate than that at which it accumulates on the first block in order to allow time for periodic removal of the coiled wire. Specification 475,358 is referred to.