Patent GB-390807-A (GB)
Title: Improvements in and relating to machines for making mounts for electric incandescentlamps and the like
IPC: H01K3/10
Filed: 1931-10-01
Abstract: 390,807. Making electric incandescent lamps. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.- (Assignees of Flaws, J. ; 1020, Caledonia Avenue, Cleveland Heights, Ohio, U.S.A.) Oct. 1, 1931, No. 27359. Convention date, Oct. 1, 1930. [Class 39 (ii).] In a machine for making filament mounts for electric incandescent lamps and the like a stem tube with leading-in wires sealed therein and protruding therefrom is provided with filament supports and a filament, the type of stem described in Specification 147,293, [Class 39 (ii), Electric lamps, Incandescent], being particularly adapted for this purpose. The stem 10 of the form shown in Fig. 5 is taken from position A, Fig. 1, of a stem-making machine and transferred to position 1 of the filament-mounting machine, whereupon it is carried along intermittently by a conveyer to positions 2, 3, 4, where the end of the arbor 12 is heated. At position 5 the arbor button is formed, and passing through an idle position 6 the stem goes to positions 7, 8, 9, where the wires are cut to length and their ends flattened, hooks are formed in the ends, and the wires are positioned by stretching. At position 11 the filament is fed, formed, and mounted, and the anchor wires are positioned and their ends wrapped about the filament. Position 12 is an idle one, and at position 13 the hooks in the ends of the leading-in wires supporting the filament are closed more tightly, and the first and third anchor wires are again positioned. The positions 14 .. 17 are idle ones, and at position 18 a conveyer removes the stem from the machine. The various operating mechanisms are disposed upon and around a table 18, Fig. 1, and are driven either by a cam shaft 17 or a parallel shaft mounted below the table and connected by a driving belt 19 to the shaft 17. The device for transferring the stem from the stem-making machine to position 1 of the filament-mounting machine comprises jaws 100, 101, Fig. 2, which grip the arbor 12, and an arm 102 formed with an opening to support the flare. The jaws 100, 101 are pivoted on pins 103, 104 and operated by levers 107, 108 which are normally held closed by a spring 109 connected between them, the opening of the jaws being effected by a wedge 110 on a sliding member 111. The grippers are mounted on a carrier which is pivotally connected to a rocking-arm 129 and reciprocates between rails 127, 128 arranged between the two machines, so that when in the end position adjacent to the stem-making machine a lever 115 is struck by a plate 114, thereby operating the slide 111 to open the grippers. The grippers are allowed to close upon the arbor, and in their other end position a roller 118 on the slide 111 strikes an abutment 116 on a rocking arm, causing the grippers to open and deliver the stem to the mounting machine. A stem which has failed to connect with an arbor is supported by the arm 102 and carried outwardly under the action of an arm 143 moving over a cam plate 144, and is struck by a rod 141 to knock it into a refuse bin. The series of receiving heads of the machine are supported on brackets and connected to one another by pins to form a bracket chain around the machine, the bottoms of the pins being provided with rollers 181, Fig. 5, which ride in a slot 182 in a track 183. Rollers 184, 185 on the brackets engage between the upper and lower faces of the track, the brackets being propelled and indexed along their path by a notched wheel 188, Fig. 6 (not shown), at the side of the track engaging the rollers 181. The notched wheel is mounted on a vertical shaft adapted to be rotated intermittently and registered by link mechanism controlled by cams on shafts 17, 20, Fig. 7 (not shown). The receiving- heads are provided with an upper jaw 150, Fig. 5, which grips the exhaust tube 11 against a stationary block, and a lower pair of jaws 157, 158 which grip the arbor 12, the closing of the jaws being effected normally by springs 154, 160 respectively. The jaws are opened at the loading position 1, Fig. 1, and unloading position 18 by an arm 156 on the bracket engaging pins 161, 162 respectively mounted in brackets on links 164, 167 connected to a lever 169 controlled by the cam shaft 17. The end of the arbor 12 is heated by burners 205, Fig. 1, as it is carried through positions 2, 3, 4, and at position 5 the button is formed and three filament-supporting wires 15 are inserted in the softened end, as shown in Fig. 17 (not shown), by mechanism of known type. The mechanism for flattening and trimming the leading-in wires, at position 7, is controlled by a vertical rod operated by a cam on the driving shaft and consists of a pair of plier-like pivoted jaws provided with hardened inserts and blades which press the ends of the wires upon a central member, the movement being imparted to the jaws by a toggle device operated by vertical movement of a rod. The lower ends of the leading-in wires having been flattened and trimmed are brought to the hook-forming mechanism at position 8 of the conveyer. This mechanism is supported on a standard 250, Fig. 12, and controlled by a rod 251 actuated by the cam shaft 17. A cam 259 on the rod 251 is connected to a lever 262 by a telescopic link 257, 260, and moves a sliding member 265, Fig. 13 (not shown), towards hookforming dies, whereupon a second member slidable upon and resiliently coupled to the first member pushes the leading-in wires forwardly. The leading-in wires are held between the dies in the manner shown in Fig. 14, whereupon fingers 283, 284, which form the ends of a link system operated by rod 251 move inwardly and upwardly to wipe the ends of the leading-in wires around the hook-forming dies 278, 279. As the rod 251, Fig. 12, descends a roller 298 on a pivoted rod 295 rides over the cam 259 until it enters the recessed part of the latter, whereupon a tensioned spring 299 connected to the top of the rod pulls the rod inwardly about its pivot 296, and causes fingers 294 projecting forwardly from the top of the rod to push the hooks from the hook-forming dies. The stem is carried to position 9 where the leading-in wires are positioned accurately by setting-mechanism consisting of three pairs of jaws, namely a pair 308, 309, Fig. 18, which grip the wires just below the stem press, and two other sets both of which grip the end of a leading-in wire and pull it to straighten and set it. This mechanism is operated by a cam-driven rod 300, the stem being brought into position when the rod is at the top of its lift. As the rod 300 moves downwardly the jaws 308, 309 are closed by the straightening of the toggle system 310 .. 314, and as the lever 313 turns on its pin 316 it brings strips 317 against the leading-in wires. Similarly the lever 314 brings a slotted locating- strip 319 against the wires. The rod 300 continues to move down after the yoke 310 has reached its lowest position, and further movement is taken by a spring 321 in contact with a block 322 connected to each setting-jaw mechanism bv a bar 323. The bar 323 moves within a. slot 324 and operates the setting- mechanism only on the downward movement of the rod 300, when jaws 326, 327 and 326<1>, 327<1>, Fig. 19 (not shown), close upon the respective wires causing them to be stretched as a slide 325 moves downwardly. The stem is next carried to the filament-mounting position where the filament coils, completely prepared for mounting are placed manually in the feeding-mechanism, which positions and forms them. The lengths of filament coil are placed transversely across a rack consisting of spaced bars parallel to a plate 401, Fig. 20, beneath which a rocking-plate carrying pairs of vertical pins 404 is mounted, the movement of the plate being effected by a rocking-lever 416 provided with an extension 421 formed with an inclined slot engaging a roller projecting laterally from a bracket on the plate 405, whereby the plate is lifted. The pins 404 engage a filament to move it forwardly between guide-plates so that it slides down an inclined plate on to a horizontal support. The filament is caused to drop on to a slide 441, Fig. 22 (not shown), supporting a sliding block which moves forwardly and clamps the filament against a semicircular die. Before the filament is released its ends are seized by two pairs of jaws 502, Fig. 20, at the ends of arms mounted on a roller which is rotated by a vertically sliding rack and swings the filament, when released, through 180 into the mounting position 11 where its ends are lowered into open hooks in the ends of the leading-in wires, the correct positioning of the filament ends being ensured by a pin 581 on the end of an arm 583. The means for locating and bending the anchor support wires 15 is mounted on a bracket 601 which pivots on a shaft 606, and is held out of the path of travel of the stems until a stem is in the filament mounting position. A platform 604 at the top end of bracket 601 is provided with a series of bending and clamping dies 616 .. 619, Fig. 30, slidably mounted thereon, the die 616 being provided with a lateral pin 620, and the die 618 with oppositely directed lateral pins 621, 622, which extend over and at right-angles to the anchor support wires. The latter are moved downwardly by the lateral pins when the platform 604 is moved downwardly, and their ends are curled around the filament by a series of dies mounted on a lower platform 605, the final securing of the anchor wires being effected by weights which drop thereon, within the platform 604. The open hooks of the leading-in wires are finally closed about the ends of the filament by a pair of pivoted jaws which are mounted on the end of a vertically movable rod and at the upper portion of their movement are cammed outwardly and force the open hooks against stationary jaws. The mounting being completed the stem is moved to the next position where setting-jaws bend the filament supporting wires into their final shape before the stem