Patent GB-381203-A (GB)
Title: Improvements in and relating to methods of and apparatus for uniting leading-in wires to the base pins of radio tubes and the like
IPC: H01J5/62
Filed: 1931-06-25
Abstract: 381,203. Making electric lamps &c. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Donovan, J. F. ; 1869, Chapman Avenue, East Cleveland, and Malloy, F. J. ; 10519, Kimberley Avenue, Cleveland, both in Ohio, U.S.A.) June 25, 1931, No. 18411. Convention date, June 25, 1930. [Classes 83 (ii) and 83 (iv).] Leading-in wires are united to the hollow base pins of radio tubes, incandescent electric lamps, &c. by presenting the assemblies in automatic rotation, with the leading-in wires projecting from the base pins, in succession to apparatus for trimming off the ends of the wires, and then to apparatus for inverting the assemblies from which they are transferred to apparatus for immersing the ends of the pins successively in a flux bath and in a molten solder bath. Dividing by a single blade ; grinding.-A series of articles are each mounted in an intermittently rotated carrier between a spring- pressed cup 31 and a fixed arm 32 with their leading-in wires 11 and base pins 12 uppermost, the jaws-29, 30 previously used in the basing operation being held open. The articles are located in their correct positions vertically relatively to a rotary disc knife 14 for trimming the wires and a grinding wheel 15 for grinding them flush with the ends of the pins by fingers 37, 38 carried by slides 41 reciprocated by forked levers 39<1> from a Y-shaped bracket 45 operated by a cam 47 on a shaft 16 driven from the basing machine by a link belt 18. The position of the slides is adjusted according to the size of the article by mounting the other end of the levers 39<1> in blocks 55 adjusted by screws 54 provided with indicators 58. The articles are positioned horizontally by levers 39, 40 which are normally pressed by springs to hold the articles against the arms 32, and are retracted by an adjustable rod 69 and lever 70 operated through a lever 98 and cam 101. The cutter disc 14 is mounted on the shaft of a motor 72 which is secured to a bracket 73 pivoted at 74, so that it may be lifted clear, on a bracket 75 oscillatable about a pivot 76, and the grinding wheel 15 is mounted on the shaft of a motor 82 secured to a bracket 83 pivoted at 84 on a bracket 85 oscillatable about a pivot 86. These brackets are simultaneously swung over the articles to effect the trimming operation by spring-controlled rods 86<1>, 871 through collars 91, 94 engaged by a cylindrical block 90 carried by the lever 70. Soldering.-When the articles reach the transfer position they are gripped by two pairs of rotatably mounted jaws 110-113 and by a spring- pressed rod on a transfer head 124, whereupon the cap 31 is pushed down by an arm 103- actuated by a rod 104 and camoperated lever 106. The jaws of the transfer head are operated by screws 117 on rotary blocks 114, 115, which are connected by thumb screws 120 to arms 118, 119 mounted on shafts 122, 123 carrying intermeshing pinions 125, 126. The pinion 125 is operated by a rack 127 on a spring-pressed rod 128 which is reciprocated in the transfer arm by an arm 132 on a shaft 135 oscillated by a cam 137 and lever 136. The transfer head is carried by a tube 141 which is rotatable in a tube 142 carried by a support 143 fixed on a shaft 145. The shaft 145 at this stage is turned by an arm 147 from a cam 149 to move the transfer arm over the soldering turret 140, whereupon the transfer head is inverted to place the articles with pins downward in the turret. The head 124 is turned by a camoperated lever 160 which reciprocates a rack 157 engaging a pinion 156 on the tube 141. The tubes 141, 142 are provided with cooperating stops 165, 166. The soldering turret is clamped to a tubular shaft 173, which is moved vertically through a collar 174 and cam-operated levers 194, 191 so as to dip the ends of the pins alternately into three flux baths and three solder baths. The turret is intermittently rotated by a cam 179 engaging a cam wheel 175 keyed to the shaft 173 and mounted in a bearing bracket 180. Prior to moving the turret downwardly the ends of the articles are engaged at positions over the flux baths by spring-pressed plungers 203 on brackets 200 adjustable by a screw 215 on a tube 206 secured to a core rod 207, which is moved vertically by a cam-operated lever. One of the brackets has an extension guided by a rod 202. The flux is contained in sponge rubber 219 in a lined hollow gear 220, which is rotated by a gear 223 on the turret. The solder baths 225 which are connected bv channels 229 to maintain the same level in each are heated by gas burners or electrically. Each bath has a scum remover which sweeps the scum into troughs 230 from which it travels to a refuse container. The scum removers, which are connected by bars 238, 239 and levers 240 and are operated by a cam 232, lever 235 and bar 237, consist of scrapers 244 carried by shafts 246, which are mounted in blocks 242 turning on pivots 241. The shafts 246 are provided with notched levers 247 which at one end of the stroke of the blocks engage screws 248 so as to lower the scrapers on to the surface of the solder. These levers are held in this position during the operative stroke by spring-pressed latches 249, which are tripped at the end of the stroke by screws 252 so as to release the levers 247. The levers are then pressed against stop screws 253 with the scrapers out of contact with the solder. The finished articles are removed from the turret by hand or by a hook 255 on an arm 256 operated by a cam 262 through arm 260 and bar 258.