Patent GB-139238-A (GB)
Title: Machines for winding motor armatures
IPC: H02K15/09
Filed: 1918-11-22
Abstract: 139,238. Wood, L. E. Nov. 22, 1918. Coils, apparatus for making. - A machine for winding a slotted armature is entirely automatic in its action and comprises mechanism for moving a guide round the armature a correct number of times, for turning the armature round step-bystep as each pair of slots are wound, and for forming loops at intervals in the wire to serve as commutator connexions. The armature core 17, Figs. 1, 2, and 3, is supported by its shaft in vertically-adjustable bearings 15, 16 on a bed 12 mounted in a frame 11. The wire guide 67 is carried by a table 20 at the top of pillars 21 which are adapted to slide up and down in a horizontally movable carriage 18. The wire is first threaded through a hole in the guide 67 and secured, the carriage 18 and table 20 being adjusted until the guide is located at the point A. The belt 50 is moved simultaneously by the rod 47 from a loose pulley 25 to a fast pulley 27, causing a screw 24 to rotate and traverse the carriage 18 to the right, laying the wire in the top armature slot. When the guide 67 approaches the point B, an arm 64 on the carriage engages a stop 56 on a rod 54 to shift a belt 61 from a loose pulley 33 to a fast pulley 34 driving a shaft 31. The shaft 31 carries a pinion 30 engaging a vertical rack 28 fixed to the table 20, which is thus lowered to wind the wire over the end of the armature. A roller 73 riding over a cam 74 rocks a lever 70 and retracts the wire guide 67 in order to clear the armature shaft: the cam has an adjustable part 75 for varying the pitch of the wound coil. In its downward movement, the table 20 first strikes a stop 42a on a rod 40 to return the belt 50 to its loose pulley; at the end of the downward movement, it causes the return of the belt 61 to the loose pulley 33; it then, by engagement with a stop 41 on a rod 39, operates the rod 51 to move the belt 52 on to the pulleys 27, by which operation the table is moved to the left, laying wire in a bottom slot. The table next strides a stop 55 on a rod 53 and causes a beltshifter 60 to place a belt 59 on the pulley 34 so that the rack and pinion mechanism raises the table, the subsequent movements being controlled in a similar manner by the table striking stops 41a, 42, one complete turn of wire then being completed. The winding is continued for the number of turns required in a coil until the machine is temporarily stopped by counting- mechanism, which is shown at the left-hand side of Figs. 1 and 2, and which disengages a clutch 109 between the main power shaft 112 and the shaft 110 driving the winding-mechanism. A pivoted lever 88 carrying a pawl 89 is oscillated at the end of each completed armature turn by the belt-shifting rod 53, the throw of the pawl being adjusted so as to cause one complete revolution of a ratchet wheel 85 when the last turn of a coil has been wound. When the ratchet wheel completes its revolution, a single tooth 104 thereon shifts a four-toothed star-wheel 103, turning a double-ended cam 99 and allowing upward movement of an arm 96 which releases a cam 95 thereon from a catch 93 fixed to a shaft 78: the spring 94 of this catch draws down its lower end into a slot 87 in the ratchet-wheel hub 86 and also in front of the single step of a cam 81, which is positively driven by chain 84 &c. from the shaft 112. This drives round the shaft 78 and a cam 106 thereon releases a lever 107, a spring 111 then throwing out the clutch 109. Flat springs 105 bearing against a squared hub 100 of the cam 99 cause a rapid turning movement of the lastnamed. The armature is turned to present a fresh pair of slots to be wound by transmitting the rotary movement of the shaft 78 to a shaft 79 and thence by means of a cam 123 and adjustable pawl-lever 118, to a ratchet-wheel 117 on the armature shaft. The loop-forming mechanism comprises a pivoted hook 129 mounted on a post 127 and connected bv a link to a bell-crank lever having a roller 134 'bearing against an adjustable cam 135. The post 127 is adapted to slide on rails 125 and is drawn towards the armature by a weight 140 and cable 139; the other end of the cable may be wound upon a drum 138 driven from the shaft 79 through a clutch 141 which is controlled by a lever 143 and a grooved cam 144. The armature is held against rotation and the wire packed into the slots while forming the loops by adjustably-mounted heads 149, 151 at the extremities of pivoted rods 146.