Patent GB-445315-A (GB)
Title: Improvements in or relating to metal spool making machines
IPC: B21D53/26
Filed: 1935-01-12
Abstract: 445,315. Making metal spools. KODAK, Ltd., Kingsway, London.-(Eastman Kodak Co. ; Kodak Park, Rochester. New York, U.S.A.) Jan. 12, 1935, No. 1155. [Classes 83 (ii) and 83 (iv)] [See also Group XXX] Welding ; punching ; embossing ; cupping.- In a machine for joining a pair of metal flanges to a core to form a metal spool such as a photographic film spool the flange blanks are supported on an intermittently rotated carrier whilst a number of operations are performed thereon, the cores are supported on a second carrier rotated in synchronism with the first, and the flanges are united to the ends of the core at the place of intersection of the paths of the two carriers. In a machine which welds the flanges to the core, means are provided for dishing the flanges, for forming spotwelding projections thereon, for forming rectangular slots in the centre of the flange and for embossing characters thereon. The cores 129 are fed to a carrier 15 intermittently rotated by Geneva mechanism and driving through a chain 28 a pair of rotary disc carriers 18, 19 for the flanges. The carrier 15 is provided with pairs of fixed and spring-closed clamping jaws 121, 122, which receive the cores by a transfer mechanism from a hopper 127, Fig. 4. The hopper has a bottom plate 130, Fig. 13, reciprocated by an eccentric 133 on a shaft 134 driven by gearing 138, 139 from the main shaft. The lowest blank rests on a plate 140 at the bottom of the shoot 128 and is held thereon by a counterweighted pawl 142 normally held in the position shown by a spring-pressed pin 146. The transfer mechanism consists of a pair of sectors 149, 150 having spring - pressed pins 152 engaging the ends of the core. The sectors are oscillated by spur gear 156, 159, 163 from a rack 160 reciprocated by a cam on the main shaft. The jaws at this stage are held open by an arm 170 mounted on a shaft 171 carrying a hooked lever 172 connected to an adjustable link 174, the roller of which is held in contact with a cam 173 by a spring 178. The core has a long narrow slot 179, Fig. 15, at the edges of the sheet from which the core is rolled and diametrically opposite thereto a wider and shorter slot 180. In order that the core may be secured in a definite angular position in the jaws, the core is rotated by a knurled head 182 on a spindle 184 until pins 126 on the movable jaw pass through the slot 179. The spindle 184, Fig. 4, which is provided with a spring pressed stripper 195, is rotated by gearing 186, 139, 138 and is moved axially by a cam 194 on the main shaft. When the jaws close, they are firmly pressed on the core during further rotation of the carrier by a fixed cam 229 engaging a spring-pressed roller 234 connected to the carrier and movable jaw by links 230, 232. The flange blanks 67 in the form of perforated discs are fed by camoperated slides from the bottom of feed tubes into shoots preferably of non-magnetic material, the lowest blanks resting on holders 86, Fig. 6, between collars 87 and spring-pressed pawls 88. Plungers 74, 75 with locating pins 106 are then reciprocated in opposite directions by a crank mechanism 80-84, Fig. 2, from a cam 85 so that the flanges pass into the carriers, being stripped from the plungers by the pawls 88. Spring-pressed guard sleeves 93 are arranged between the carriers. Each carrier contains a number of clamps 20, which consist of rings 97, Fig. 7, having a number of pins 99 moved radially by a spring 103. The pins have two teeth 100, 101 with one side inclined, the slope on the tooth 101 being steeper than on the tooth 100. The carriers are slidably mounted on a sleeve 21, Fig. 2, so that they may be pushed against adjustable stops 50, 51 with the flanges engaging a fixed die 107. This is effected by links 44 engaging spring-pressed studs 42 and connected by links 41 to the slides 38, 47, which carry the movable dies 110. The dies are adjustable by wedges 111 on the slides, which are reciprocated by toggle mechanism 55, 57, 60, 59, from cams 63. One or more sets of dies may be provided. As shown in Fig. 12, the first set of dies 114 is provided with fins 117 for forming the slots in the flanges and with embossed characters 118 and the second set 115 dish the flanges and have projections 120 for forming the spot projections. The cuttings are removed from the die 107 by negative pressure. At the assembly station, Fig. 1, the jaws 121, 122 are held in alignment with the flange clamps by bell-crank levers 202, 201, which have teeth 206, 203 respectively engaging a notch 198 in the jaw 121 and notches 199 in one of the carriers 18, 19. These levers, which are controlled by a spring 204 and are adjustable with respect to each other by a pin 215 are controlled by a cam 210 through links 207, 211 and a spring-pressed adjustable rod 212. The levers 201, 202 may be mounted on an adjustable eccentric sleeve 200<1>. Welding is then effected by a pair of electrodes 217, 220, Fig. 2, which have locating pins and push the flanges out of the carriers and weld them to the ends of the cores. The electrodes are reciprocated in opposite directions by a cam-and-lever mechanism 219, 224, 223, 221, 222. At the delivery station a pair of pins 241, Fig. 8, on slidable arms 240 engage the ends of the finished spool and are rotated to remove the spools from the jaws, which are finally opened by an arm 267, Fig. 1, mounted on a shaft 268 carrying a hooked arm 269 connected to an adjustable rod 272 pivoted to a link 271 and engaging a cam 274 against which it is held by the other end of the spring 178, which is connected to the hooked arm 172. The arms 240 are normally closed by a spring 242 but are opened so as to release the spool by a cam 250, lever 251 and reciprocating spindle 248 engaging a yoke 246 connected by rods 247 to the outer arm 240. The arms 240 are connected together by links 244, 245. The shaft 237 is oscillated by a cam 255 through links, one of which is adjustable and spring- pressed, and a gear sector 256 and pinion 257. The shaft 237 has a plate carrying adjustable stops to limit the motion thereof. The jaws 121, 122 are held open during their travel from the delivery station to the core feed station by a rail 276.