Patent GB-651968-A (GB)
Title: Coil winding machine
IPC: B21F3/04
Filed: 1947-07-31
Abstract: 651,968. Winding coils. GENERAL MOTORS CORPORATION. July 31, 1947, No. 20781 Convention date, July 26, 1940. [Class 120(ii) A coil-winding machine adapted to wind on an arbor coils of wire and layers of paper alternately, is provided with a pair of alternately actuable clutches to connect a prime mover to drive the arbor respectively in a primary drive at high speed and, for the paper winding, in a secondary drive at low speed. (1) Machine operation and control, General (Figs. 6, 68). - The arbor H is driven at high speed for the winding of wire thereon by the main driving pulley A, through a shaft B, clutch C, pulley D, belt E, pulley F and shaft G. This latter shaft also drives a revolution counter P and screws I, J, for traversing a nut K which reciprocates a rod M carrying guide wheels N for guiding the wires to the arbor H. During the winding of paper over each layer of wire, the arbor H is driven at slow speed through a speed reduction gear box Q, shaft R, gears S, T, a one-revolution clutch U, sprocket V, chain W, sprocket X, manually-controlled clutches Y, cam shaft Z, gears HH, LL, and clutch MM. The cam shaft Z, which may be manually operated at AA, drives, through bevel gears BB, a counter CC for the paper layers. The cam shaft Z also drives (1) a brake cam DD, which through a connection DD-1 controls a brake EE for resisting the rotation of the shaft FF upon which the paper supply roll is carried ; (2) shear cams GG for severing the paper wound on the arbor from the paper supply; (3) through the gears HH, II and a clutch JJ, a shaft KK which drives the feed roll for supplying paper to the arbor; (4) gears NN, OO for rotating at halfspeed a cam PP which, through connections PP1, PP2, shifts the nut K from screw I to screw J, or vice versa, and also slightly shifts the rod M longitudinally to ensure that the end turns of wire are not directly superposed. The disconnection of clutch C and the connection of the clutch U, in preparation for the winding of the paper, are brought about by the counter P which, through a control QQ opens clutch C after the required turns of wire have been wound and through a control RR brings into action a one-revolution clutch SS which connects a low speed shaft TT with a main control cam UU to rotate the same. This cam, through a connection VV, closes the clutch U so that the shaft Z is rotated (providing the hand clutch Y has been manually closed). Clutches JJ and MM are normally disengaged but as the gear HH begins to turn these clutches are engaged so that the shaft KK will rotate to feed paper to the arbor. As the arbor begins to wind paper thereon, the clutch JJ is automatically opened and after one revolution of the shaft Z, the clutch U is also automatically opened. After one revolution, the main cam UU, through a conriec- .tion UU2, will re-engage the clutch C for winding another layer of wire. When the required number of layers have been wound, the counter CC closes the switch a. to energize a solenoid b to move the starting lever f, pivoted at g, to non-operating position and through a connection i to open the main clutch C. Each strand of wire from its supply reel controls a mercury switch 928 so that whenever a wire breaks the clutch C is opened. The signal lamp s indicates the operation of the solenoid b. The severing of the paper from supply is effected by razor blades RB mounted on a rocker shaft RS controlled by mechanism BO which operates in conjunction with a blade-distant control mechanism BD, governing the amount by which the shaft RS has to move to effect severance, through connections BO1 and BD1. The blade-operating mechanism BO is controlled by a onerevolution clutch WW driven by sprockets VV1, VV3, and chain VV2 from the shaft .R. The clutch WW is closed automatically by a connection WW1 when the rod M is moved in one direction, the side edges of the paper being severed following each two wrappings of paper on the arbor. At the end of a wind, it is necessary that the operator moves a lever j which through a connection j1 will reset the device BD so that the shaft RS will move the maximum distance when the first severance of the next wind is necessary. This lever j through the connection j2 also controls the braking EE of the shaft FF. A pedal L is fitted to operate through mechanism l2 to prevent the closing of the clutch WW to prevent the motion of the cutting blades RB while the operator is setting-up by hand. Also the pedal l through a connection l1 opens the clutch Y, a latch k through connection k1, holding the pedal depressed, to prevent the slow drive to the arbor being operative until required. A pedal m permits severing of paper without the operation of the mechanism BO and a pedal n provides for moving a paper supply roll into unwinding position. In using the machine; coil-carrying tubes 980 are first positioned on the arbor H, a length of flexible braided wire 981 being stapled to each tube. The end of each length 981 is fitted inside the tube and positioned in a groove 984 in the arbor to form a driving "key" for the tube. The ends of the wires 917, Fig. 11, from supply are attached to the wires 981. The Specification sets forth in detail the hand operations necessary for winding on wire and paper at the beginning and end of the coilforming operation and the application of coatings of shellac thereto. (2) Detcdts:-(a) Primary drive to arbor and counter for winding and counting layers of wire (Figs. 7, 34, 39, 44.) - The pulley A and shaft B are driven from an electric motor by a belt 100. A friction disc fastened to a rotary member, splined at 118 to the shaft B, forms the clutch C which drives the face of the pulley D and hence through the belt E, the pulley F and shaft G. This shaft through a worm 250 drives a shaft 252 and hence, through a selectable gear train, a revolution pointer 283. The shaft G drives an aligned extension G1 which provides the driving socket for the arbor H which is supported at its other end in a bearing slidably mounted on a pedestal 138 and manipulated by a handle 140 which may be locked against movement by a spring-urged lever 143. To the shaft G is splined a double gear 151, 153 which may be slid axially by means of a handle 163 to mesh with gear trains driving gears 156, 157 and hence the wire traversing screws I, J, to provide a wire helix of open or close wind. The screws I, J, co-operate with half-nut members 168, 169 mounted upon a lever 170 rockable on a rod 171 by the cam PP. The rod 171 is furnished with a threaded portion with which engages a spring-urged lever and nut to prevent accidental movement of the rod 171 when reversal of traverse is being effected. The cam PP, which is rotated at half-speed by the secondary drive (see 2(b) below), oscillates a lever 192 and through resilient connections moves the lever 170 and engages the half-nuts 168, 169 with the appropriate screw I or J. The lever 192 through a rod also governs the locking operation of the nut and screwed portion of the rod 171. To the rod 171 is keyed a helical member which, through a ball and groove, effects a slight longitudinal movement of the traverse rod M, which is supported on .rollers to stagger the end turns of wire. After the winding of a predetermined number of turns of wire, an adjustable stud 290 on a plate 281 frictionally driven through a gear train from the shaft 252 contacts a lever 296 to disengage the clutch C to stop the primary drive to the arbor H. If the rod M moves too far in either direction, a bracket thereon moves one of two bell crank levers 311, Fig. 32, which, through a link and lever train, lifts the lever 296 to open the clutch C and stop the machine. Nuts 347. 348, which are adjustably locked to screwed rods 335, 336, are contacted by an extension on the lever 170 if and when the turn counter P should fail to open the clutch C. In such an event, a link 346 is rotated by the lever 170 to open clutch C. (b) Secondary drive to arbor for winding layers of paper (Figs. 7, 11, 20, 34). - The shaft B through worm and wormwheel gearing also drives the shaft R which drives the shaft section 359 carrying the gear wheel S meshing with wheel T to drive sprocket V through a one-revolution clutch U. The sprocket V drives shaft Z which extends parallel to the arbor H and carries gear HH meshing with gears II, LL. Gear LL is journalled on shaft G1, Fig. 44, and is connected thereto by the clutch MM, one part of which is splined to the shaft. The gear HH is provided with a cam which engages a roller to move a linkage maintaining clutch MM open all the time the primary drive to the arbor is operative. Another cam on the gear HH also opens the clutch MM to prevent rotation of the arbor H while the paper is being sheared. After one revolution the gear HH is stopped. The gear HH drives the shaft KK through a spring- pressed clutch JJ governed by a cam 385 on gear HH, the cam being arranged that the shaft KK will be rotated by shaft Z during about one-quarter revolution thereof. The shaft KK carries a roller 390, rubber-faced at 391, with which co-operates bosses on an idler roll 400, for feeding the strip of paper 392 from a roll 393. After three turns of naper have been wound, a spring-urged blade 413, operated by a cam on the shaft. Z, is moved to shear the paper against a stationary blade, thereafter the arbor winds up the length of paper between the arbor and shear blades ; the shaft 2 then coming to rest because of the opening of the clutch U. The cam PP is so operated that during the time the traverse lever 170 is moving between the traverse screws 1. J the paper is fed, severed and wound. The clutch U, which is under the control of the main cam UU, comprises a ratchet furnished with notches with which co-operates a pawl pivotally attached to a disc 456 on a shaft driven by the sprocket V. The pawl is engaged by a locking pawl to keep the clutch open, t