Patent GB-533854-A (GB)
Title: Improvement in wire drawing machines
IPC: B21C1/12
Filed: 1939-09-18
Abstract: 533,854. Drawing wire. TRIGGS, W. W. (Morgan Construction Co.). Sept. 18, 1939, No. 26078. [Class 83 (iv)] A continuous wire drawing machine has a series of drums 10, 11, 12, 14, 15 with corresponding dies 16. The centre drum 12 is driven by worm gearing 24 from a motor driven side shaft 26 divided into sections corresponding to the drums and connected by flexible couplings 72. Drive to the worm 24 is through a friction clutch 74 that takes the place of a fluid coupling. The other drums are driven through worm-wheels 67 connected to pump casings 44 having three chambers containing pinions 52 and provided with suction parts 48 and delivery parts 49. The pinions mesh with gears 51 keyed on the drum shafts 28 which also support the pump casings by ball bearings 64, 65. The shafts 28 are mounted in ball bearings 31, 32 the latter being in chambers 40 connected with delivery ports and to pipes 84 leading outside the chamber in which the drums are mounted by casings 39 having flanges 35 resting on ledges 36. The drums 93 are mounted on dowels 113 in spiders 114 keyed to the shafts 28 and are held in place by caps 109 that provide for the circulation of cooling air from a fan 98 to the upper part of the chambers whence it passes as shown by the arrows on Fig. 3 escaping through openings 106, 107 across the wire coiled on the drums. Flanges 104, 105 coact to prevent undue leakage at the bases of the drums. Oil pressure in the pipes 84 is indicated by gauges 86 and controlled by valves 85 that are set to maintain a predetermined constant pressure so that the drums are driven under constant torque. The pump elements driving the later drums have a less axial height since these drums require less torque. The drums 10, 11 and 14 have manually operated shut off cocks 87 that close the oil discharge except for a small drilled hole. The oil passing the valves is returned at 90 over the gearing to the sump. The dies 16 are arranged alternately at low and high levels so that the wire passes as shown in Fig. 2 the coils on alternate drums being reversely arranged. Since most of the wear of the drums is caused by the first few turns of the on-coming wire, drums 11, 14 can be exchanged with the drums 10, 12 after wear has taken place and their useful life is doubled. In threading-up, the pointed wire is passed through the first die and coiled on the drum 10 the valve 87 being closed to provide the extra torque required at this time. When sufficient wire has been drawn, the motor 73 is stopped and the valve 87 opened and the wire is passed through the next die to the drum 11 and the operation is repeated. When drawing onto the third drum which is driven at constant speed the friction-clutch is disengaged and then reengaged slowly to prevent breaking of the wire. The drum 14 is brought into operation similarly to the first two drums. The final drum 15 does not have a valve 85 since this drum must always operate without back tension on the wire and the threading torque is consequently substantially the same as the running torque. In a modification Figs. 10 and 11 a two tier drum is employed which may replace the positively driven drum 12 to convert the five drum into a six drum machine. The worm wheel 67, Fig. 10, in addition to driving the pump casing 43 has a sleeve extension 121 on which a drum 126 is mounted. The central gear of the pump is keyed to the spindle 120, that passes through the sleeve 121 and carries the upper drum 137 that is of larger diameter than the lower drum proportionally to the extension of the wire. In this form an idle pulley is required the wire passing from the die 145. Fig. 11. directly to the drum 126 thence round the idle pulley 146 to the die 147 and drum 137 from which the wire passes direct to the die 16 and drum 14, Fig. 2.