Patent GB-1290909-A (GB)
IPC: B23P21/00
Filed: 1969-12-08
Abstract: 1290909 Assembling television tuners; welding by pressure MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 8 Dec 1969 [7 Dec 1968 (8)] 59895/69 Headings B3A and B3R Apparatus for the assembly of a shaft with members 1, 1<SP>1</SP>, comprises a jig 5 for holding the assembly, a device 6 for positioning the shaft transversely of the member, a device 7 for rotating the shaft in the member to the desired position and devices 9, 9<SP>1</SP> for securing the members and shaft together. Discs 1, 1<SP>1</SP> of a television tuner are placed on a jig 5 in supports (13), each of which is provided with a pair of magnets (19) and a reference pin (18) to locate the discs angularly by entering a hole b in each disc. Figs. 4-6 (not shown). Each time a pair of discs is placed in a jig, a signal is generated to rotate a turntable 4 one step and then to initiate a series of operations at work stations provided with devices 6-11. The device 6 comprises a shaft feed wherein a shaft 2 is fed from a shoot into a lateral transfer means 33 which aligns it with a push rod 34. The shaft is advanced by the push rod until it contacts an adjustable abutment (31) and a fork member of a locator (15) enters into a circumferential groove d in the shaft, Fig. 5. The locator prevents the shaft moving radially outwardly by centrifugal force as the turntable rotates. A shaft location means 7 is provided with a control head 50 and with a support rod 54 resiliently connected to a head pin 52, which is formed with a recess of the same shape as the end of the shaft 2. The head pin is advanced until it abuts the shaft end and the control head advances the support rod 54 its full travel. The rod and head pin are then rotated until the flat in the recess in the latter is aligned with the flat C of the shaft 2, whereupon the head pin slips over the end of the shaft and it is rotated until it is correctly angularly disposed in the discs 1, 1<SP>1</SP>, Fig. 2 (not shown). A shaft position detecting device 8 advances a head pin 68, which carries a feeler plate (69), Fig. 12 (not shown), and if the shaft 2 is correctly disposed, the feeler plate will move along the flat on the shaft 2 until it abuts its end. A signal is then transmitted to welding devices 9, 9<SP>1</SP> so that the discs will be welded to the shaft at the appropriate work stations. If the shaft is incorrectly disposed then the head pin will only move a shorter distance or if there is no shaft in the jig 5 then the pin will complete a full stroke. In either case the welding devices will not receive an electric signal. The devices 9, 9<SP>1</SP> are similar in construction and each secures one disc to the shaft. A jig 5 is brought under a bracket 76 and the piston-rod 78a of an actuating cylinder 78 lowers a frame 77 until a pair of welding tips 89, 90 are in alignment with the shaft 2. A cylinder 85 is then actuated moving the tip 90 until its holder abuts a stop 91 and when its reaction overcomes a spring 84, the tip 89 is moved. The tips contact the shaft with equal pressure on either side. The device 9 welds the disc 1<SP>1</SP> and after passing the jig through an inoperative station, the device 9<SP>1</SP> welds the disc 1 to the shaft. At the final station, an unloader 11 is actuated to lower clamping arms (111), (111<SP>1</SP>), Fig. 20 (not shown which resiliently close on the shaft 2. The arms are then moved to disengage the discs from the pins (18) and they are swung round so that the shaft and disc assembly lies over a shoot 12. The assembly is released and discharged from the apparatus.