Patent GB-324746-A (GB)
Title: Improvements in or relating to machines for wrapping bobbin electrodes of electric batteries
IPC: H01M4/10
Filed: 1928-11-21
Abstract: 324,746. White, A. E., (Abingdon Engineering Co., Inc.). Nov. 21, 1928. Electrodes.-A machine for wrapping up bobbin electrodes of electric batteries comprises devices having movements of translation relative to the bobbins for winding a cord round the bobbins. Means are also provided for folding wrappers on the bobbins and applying adhesive. The operations are carried out at five separate stations on the machine indicated by I, II, III, IV, V, in Fig. 1. At station I the thread is wound round the bobbin, the thread being cut off at a point e between the stations I and II. At station II the bobbin is rotated to wind up the severed end of the thread, and the end of the fabric wrapping is coated with an adhesive such as paraffin. At station III one end of the fabric is partly folded down, the folding being completed at the stations IV and V. Fig. 10 shows a bobbin as it is placed in the machine. It comprises a carbon electrode a' surrounded by depolarizer from which one end a<13> of the carbon rod projects. A fabric wrapper is placed loosely round the bobbin, the ends of the wrapper extending beyond the bobbin at each end as shown at a<4>, a‹. A number of bobbins are placed in carriers c, Fig. 1, on an endless chain c<1> which moves with a step-by-step motion through the machine which is provided with a power shaft i<2> driven through a chain i from a motor. 'The step-by-step motion is given to the chain c<1> by means of a Geneva wheel m actuated by a pin l<3> on an arm l<2> carried by a shaft l<1> which is rotated by gearing and shafting from the power shaft i<2> . The bobbins are placed in their carriers c with the projecting carbon rods abutting against a guide plate j<6>, Fig. 1. On arriving at station I the bobbin is gripped by devices d, D shown in detail in Fig. 3. These devices are operated by a cam d<3> which actuates a side d<5> connected to a lever d<8> attached to a sliding spindle d<1>. The latter when moved to the right makes contact with the end a<7> of the bobbin, Fig. 10. The spindle d' carries a member d<16> having internal cam surfaces which cause arms d<23> to clamp the end a<4> of the fabric against the spindle d<1>. A similar clamping device D<23> is provided for the other end of the fabric but the spindle does not extend to the end of the clamping jaws and the end a<5> of the fabric is consequently crumpled about the end a<13> of the carbon rod which is held in the jaws D<23>. When the jaws D<23> clamp the rod a<1> they also clamp against the rod the end of 11 thread B led from a reel supported above the machine. The two gripping devices d, D are then rotated while a thread-feeding device n travels across the machine to cause the thread to be wound round the bobbin. The rotation of the devices d, D is produced by the rotation of hollow spindles d<14>, D<14> bv means of gears d<24>, d<25>, D<24>, D<25> and shafts d<26>, D<26> connected by a coupcoupling d<27>. The shaft d<26> is rotated from the power shaft i<2> through gears i<4>, d'<2> the latter being loose on the shaft d<26> but capable of being connected thereto by a clutch d<28> which is operated by a rod d<35> actuated by a lever d<38> and a cam mechanism on the shaft r<1>. The cam mechanism is arranged so that the rod d<35> is retracted and the clutch placed in operative position while the spindles d <14> , D<14> make a predetermined number of revolutions. The thread-feeding device n is moved across the machine while the bobbin is being rotated, by a cam n<7>, Fig. 4, which actuates a rod n<8> connected to a lever n<6>. The latter operates a lever n<4>, Fig. 2, which reciprocates a slide n<3> carrying the thread-feeding device. The latter is thus given a movement which causes the thread to be wound on the bobbin in a form dependent on the form of the cam n<7>. Just before one complete rotation of the cam n<7> the rotation of the gripping devices d<23>, D<23> ceases, the spindles d<14>, D<14> are retracted and the bobbin is released. The remainder of the cam surface n<7> then causes the thread to move clear of the jaws ,!i3d the conveyer moves the bobbin to station II. Fig. 6 shows the thread-cutting device which is operated by the cam e<5>, Fig. 4, acting through links e<7> and a slide e<8> which carries a pin e<9>. As the slide e<8> moves downwards the pin e<9> strikes a lever e<10> which raises a plunger e<11>. The latter is provided with a slide e<12>, Fig. 6, having a jaw e<3> which raises the thread b<1> and clamps it against an upper jaw e<13>. Both jaws are then raised, bringing the thread against a knife edge c<20> which cuts the thread. As the thread is being cut the core of the bobbin is gripped by a device D<x>, Fig. 2, which is rotated by gears D<44> and causes the loose end of the thread to be wrapped round the end of the core by a wire brush f, Fig. 1. Simultaneously the outer surface of the portion a' of the fabric makes contact, with a roller o, Fig. 4, turning in a bath of adhesive o<1> such as molten paraffin. The next. movement of the bobbin carries it to the third station where one fold a<8> of the fabric, Fig. 11, is' made by a lever p, Fig. 2, rotated periodically about its pivot p<1> by a link p<2> which is reciprocated by a mechanism k. The bobbin is then moved to a further point and the unfolded portions of the fabric pass between inclined walls g<1> of a guide g which completes. the folding of the fabric over the bottom of the bobbin. The other end of the fabric a<14> is tamped inwardly against the end face of the bobbin by the device shown in Fig. 9. The core is held in jaws k<23> which are closed through a sliding mechanism k<G>. When the latter moves to the left as far as possible the slide k<18> together with sliding plates k<10> move as a unit thus sliding the jaws k<23> along the core and tamping the end a<14> of the fabric against the bobbin. Projecting corners on the fabrics are smoothed down bv a cam surface h<3>, Fig. 2, the bobbin being rotated bv a roller h. The rotation of the bobbin is used also for applying paraffin to the carbon core as. shown in Fig. 13, the melted paraffin being contained in a tank 14 and applied to the core by a brush 17 which is raised at intervals bv an arm 16 operated from a cam 25.