US2462620A - Winding machine - Google Patents

Description

Feb. 22, 1249. J, ENGLAND I 2,462,620

WINDING 'MACHINE Filed May 4, 1945 Y 3 Sheets-Sheet l lllm "llllll' 85 INVENTOR.

f/IMES M f/vaLA/va Feb. 22, 1949 2 J. M. ENGLAND WINDING MACHINE Filed May '4, 1945 s Sheets-Sheet 2 A; V Y

IN VEN TOR.

' T R/VFV JAMES /W. fNGL/IND.

Feb. 22, 1949. Y ENGLAND 2,462,620

WINDING MACHINE fJ mW.

Patented Feb. 22, 1949 2,462,620 WINDING MACHINE James M. England, Lebanon,

Mo., assignor of onethird to David E. Owen and Edmond A. Gill,

both of Litchfield, 111.

Application May 4, 1945, Serial No. 591,964 15 Claims. (01. 242-13) This invention relates to a winding machine for winding conductor wires on an armature having open slots in its surface.

One of the objects of this invention is to produce an improved armature winding machine which is simple and compact in construction, easy to operate and efficient in winding.

Another object is to provide in a winding machine improved means for rotating an armature a predetermined number of turns.

Yet another object is to so construct the armature rotating means of a winding machine that the predetermined number of winding turns can be quickly varied at will.

Still another object is to produce a winding machine for an armature which will readily permit an odd number of windings to be placed in any one coil of a plurality of coils wound into conductor receiving slots.

A further object is to produce improved starting and stopping means for an armature rotating shaft of a winding machine.

A still further object is to produce a winding machine in which the conductors to be wound into slots of the armature may be quickly and efficiently placed in the armature slots in such manner that the resulting coils will have tight windings.

ther objects of the invention will become apparent from the following description taken in connection with the accompanying drawings in which:

Figure 1 is a front view of an armature winding machine embodying my invention;

Figure 2 is a top view of the machine as shown in Figure 1 with the exception of part of the belt driving means and the conductor feeding mechanism;

Figure 3 is an end view of the machine showing details of the armature turning and stopping mechanism, the mechanism being in the stopped condition;

Figure 4 is a rear view of the turning and stopping mechanism;

Figure 5 is another end view but showing the parts of the machine in positions assumed when the armature is being turned;

Figure 6 is a sectional view taken on the line as of Figure 2 but showing the parts in driving condition;

Figure 7 is a sectional view taken on the line 1-1 of Figure 4 showing the parts in driving condition;'

Figure 8 is a view showing details of part of the stopping mechanism;

Figure 9 is a top View of an armature and the guide block in which it is held during winding;

Figure 10 is a view of the armature and guide block as viewed on line Ill-l0 of Figure 9; and

Figures 11 and 12 are two views of the guide block per se.

Referring to the drawings in detail, the winding machine illustrated has a frame which is provided with legs 2. At the left end of the frame 4 there is provided a support member 3 having upstanding spaced portions 4 and 5 in which is journaled a driving shaft 6. The inner end of this shaft adjacent the upstanding portion 5 is provided with a plate I to which is secured a guide block 8 by means of bolts 9. On the shaft intermediate the upstanding portions 4 and 5 is a pulley H! for driving the shaft by means of a belt H and adjacent this pulley is a brake drum l2 for stopping the driving shaft. Cooperating with the brake drum is a brake band [3 having one end fixed to the support member 3 and the other end connected to an actuating rod 14 whereby the band may be applied and released.

The belt II for driving the drive shaft 6 through the pulley l0 may be driven from any suitable source of power, as by way of example, an electric motor l5 mounted upon the frame at the right end thereof together with pulleys l6 and I1, a belt I8 and an overhead shaft l9. This overhead shaft carries a pulley 20 for driving the belt II. The overhead shaft 19 is journaled in suitable hangers 2| which are mounted on any fixed support as a Wall or ceiling of a room in which the winding machine is placed or a support structure upstanding from the frame I.

The belt H has such a length in relation to the diameters of the pulleys l9 and 20 and the distance between their centers, that it is normally slack and incapable of transmitting any power from the overhead shaft I9 to the driving shaft 6 of the winding machine. In order that power may be transmitted when desired, there is provided a tensioning idler pulley 22, the shaft 23 of which is carried on the end of an arm 24. This arm 24 is pivoted intermediate its ends .by means of a bearing sleeve 25 positioned on a shaft 26 arranged parallel with but rearwardly of the driving shaft 5 of the winding machine. The shaft 26 is journaled in suitable bearing projections 21 and 28 integral with the upstanding portions 4 and 5 of the support member 3 in which the driving shaft 6 is journaled. The arm 24 has a handle 29 for swinging the arm and the idler pulley towards the belt to tension said belt and condition it for power transmission. The lower end of the arm 24 below its pivotal mounting has connected thereto a spring 34 which extends beneath the driving shaft 6 and is connected to the forward side of the support 3. This spring normally swings the arm 24 and its idler pulley 22 away from the belt. Above its pivot the arm 24 has connected thereto by a slip joint the actuating rod M of the brake. When the arm is swinging away from the belt the brake will be applied by the spring 30. When the arm is moved to cause the idler pulley to tighten the belt the brake will be released. I

On the extreme outer end of the shaft 26 beyond the bearing projection 28 is rotatably mounted a ratchet wheel 3| having teeth 32.

Beyond this ratchet wheel and also rotatably mounted on the shaft 26 is a sleeve 33 to which iswelded a rod 34 at 'a point intermediate its ends. The rod 34 is of sufiicient length to extend to ajpointabove the ratchet wheel and to a considerable point. below the ratchet wheel as is clearly shoWn in Figures 3 and 5. The lower end of 'this rod 34 has pivotally connected thereto a pitman. 35 by means of a pivot pin 35. The other end of this pitman is pivoted on a crank pin 31 which is carried by a collar 38 secured to the outerend of the driving shaft 6 of the winding machine. the driving shaft and thus it is seen that when the;driving shaft is rotated the pitman will be so operated that the rod 34 will be given a rocking movement about the axis of the shaft 26 and the upper end thereof will be swung back and forth about the axis of the said shaft 26.

v The upper end of the rod 34 has pivotally mounted thereon a pusher member or dog 39, the free end of which is arranged to cooperate with the teethtZ of theratchet. A spring 40 is connected between the dog 39 and the rod to normally bias the dog into cooperative relationship with the ratchet wheel. The teeth of the ratchet are so spaced apart and the extent of swinging movement of the upper end of the arm to which the'fdog is pivoted has such a sweep back and forth that each rotation of the drive shaft 6 will cause the ratchet wheel to be given a notchedup rotation equal to the angle between teeth. In order that theratchet wheel can have no reverse movement when being notched-up, there is provided an arm 4| which has one end pivoted by a pin 42 to the top of the upstanding portion 4 of the support member 3. This arm extends in a rearward direction and alongside the topportion of the ratchet wheel. Intermediate the ends of the arm there is a pin 42 which projects laterally from the arm and is arranged to engage with the teeth of the ratchet wheel and prevent any reverse rotation of said wheel. A spring 43 is connected between this arm and theflbearing projection 28 to normally bias this arm downwardly so that the pin can be in the position to be engaged by a tooth. end of the arm 4| extends alongside of the dog 39 and beneath a pin 44 projecting laterally from said dog. This outer end of the arm and the pin are employed to control the operative 7 relationship of the dog with the ratchet wheel.

Thus as the arm is raised up to the position shown in Figure 3, the pin 44 will be engaged and the dog lifted to a position where it cannot engage a tooth to notch-up the ratchet wheel. Also when the arm 4| is raised to disengage the The outer The pin 31 is eccentric to the axis of dog the pin 42 will move to a position where it cannot be engaged by a ratchet wheel tooth so that reverse rotation of the ratchet wheel is no longer prevented.

The arm 4| is controlled by a short arm 45 which is fixed to the end of a shaft 46 journaled in brackets 41 and 48 which are fastened to the backend of the support'member 3. This shaft 45 intermediate its support brackets is provided with an inverted U-shaped arm 49 which extends upwardly behind the arm 24 on which the idler pulley 22 is journaled. The arm 24 is arranged to control the rotation of the shaft 46 and to accomplish this the rear side of the arm 24 has secured thereto a bracket 56 which, with the arm, forms a slot 5! in which the upper cross end of the U-shaped arm is received. With this arrangement it is seen that if the arm 24 and the pulley are moved in a direction away from the belt the shaft 46 will be rotated as will also the control arm 45v on its end. This will rotate the arm 45 in a clockwise direction, as viewed in Figure 7, and since this arm is beneath the arm 4| it will move said arm 4| upwardly and, as already noted, cause the dog 39 and control pin 42 to be lifted out of cooperation with the ratchet wheel. Thus it is seen that whenever the idler pulley is positioned to permit slackening of the belt so that the drive shaft 6 cannot rotate, there will be a freeing of the ratchet wheel. 7 On the other hand, when the arm 24 and the idler pulley are moved inwardly towards the belt to tighten the belt so that the shaft 5 can be driven, the dog 45 will be permitted to drop into cooperative relationship with the ratchetwheel, as will also the pin 42 on the 7 arm 4|.

7.5.1, tending from The projections 21 and 28 in which the shaft 25 is journaled have upstanding portions 52 and 53 in which is reciprocably mounted a rod 54. The rod has an end extending to a point closely adjacent the ratchet wheel which end 55 is beveled as best shown in Figure 8. A spring 56 surrounds the rod and is interposed between the upstanding portion 52 and a washer 5'! on the shaft to thus normally bias the rod to the position' where the beveled end will be adjacent the ratchet wheel. The rod 54 is positioned just rearwardly of the arm 24 which carries the idler pulley so that this rod can control the on and off position of the arm 24, that is, the positionwherein the idler pulley tightens the belt I I and the position where the idler pulley permits. the belt to be slack. ,The rod 54 has a lug 58 thereon which is so related to the arm 24 that it can move behind the arm under the action of the spring 58 whenever the idler pulley is tightened. This condition is shown in Figure 8, it being noted from the figure that when the lug 58 is positioned behind the arm 24 the beveled end of the rod 54 will be in its position closest to the ratchetwheel. If the rod 54 should be reciprocated in a direction away from the ratchet wheel and against the bias of the spring'fifi, the lug 58 will move from behind'the, arm 24 and permit this arm to swing rearwa'rdly under the action of its spring 35, thus placing the idler pulley in a position where the belt 'I I will be slack and the brake applied 'This position where the arm is released is show'nin dashed lines in Figure 8.

The movement of the rod 54 against the bias of the spring 56 is accomplished by means of a cam bolt 59 carried by the. ratchet wheel and exits inner surface. With this cam bolt on the ratchet wheel it is seen that when the atchct Wheel is moved to a position where the cam bolt can engage the beveled end of the rod it will move the rod away from the ratchet wheel and carry the lug 58 from behind the arm 24, thus releasing said arm and the idler pulley. When the arm 24 is released it will-become positioned behind the lug 58 and prevent the movement of the rod 54 back to its position where the beveled end is adjacent the ratchet wheel. When the arm 24 is released the ratchet wheel will be freed because of the upward movement of the control arm 4| as already indicated. When the ratchet wheel is freed it is desirable to return it to its beginning position so that it will be ready for another cycle of operation. This is accomplished by providing a weight 6i! on the ratchet wheel at a desired point which will be substantially diametrically opposite the tooth of the ratchet wheel which is to be first acted upon by the dog. In place of this return weight other means such as a spring can be employed. To stop reverse rotation of the ratchet wheel at a given place the wheel is provided with a pin 6| arranged to engage an arm 62 extending outwardly from the support member 3.

The guide block. 8 which is on the inner end of the drive shaft 6 of the winding machine is arranged to receive the armature to be wound so that the drive shaft can rotate the armature. As best shown in Figures 9, 10, 11 and 12, block 8 has a semi-cylindrical recess 63 which is of a size to receive the armature 64 which is to be wound. The armature is held in the recess of the guide block by a rotatable spring biased plunger 65 having a curved head 66 for engaging the armature on the side opposite the guide block. The plunger 65 is reciprocal in a holder 61 mounted on the top of the frame l. A fairly strong spring 68 acts on the plunger to bias it in the direction toward the armature. The plunger is arranged to be controlled by a lever 69 pivoted to the holder 61. The intermediate portion of this handle is connected by a rod IE! to the outer end of the plunger, the connection being made through a sleeve H on the rod for receiving the end of the plunger and a pin E2 on the plunger. With this arrangement the plunger can be reciprocated, yet the plunger is allowed to rotate whenever the armature is rotated.

The guide block is formed with curved guide surfaces 73 on opposed sides for guiding the conductor wires 14 and i5 into the desired armature slots during winding. These conductor wires are connectable to the armature by means of a suitable cap l6 mounted on the end of the armature shaft H. The wires are fed to the armature over sets of pulleys i8 and 19 (see Figures 1 and 3) from the supply reels 80 and 81. The sets of pulleys are mounted on the front side of the frame I and each comprises an upper pulley B2 and a lower pulley 83, both mounted upon a suitable bracket 84. One wire, for example the wire it, comes from the feed reel 8| and passes over the upper pulley of the set 79 and. the lower pulley of the set 18 after which, due to the position of the lower pulley, it will be properly fed to the desired armature slot as the armature is rotated by the shaft 6. The other wire '55 coming from the feed reel 80 passes over the lower pulley of the set 19 and the upper pulley of the set it and then to the armature slot. Each pulley is provided with a brake 85 which is arranged to be controlled by a nob 86. By braking the pulleys the proper tension can be maintained on the wires being wound merely by adjusting the intensity of each brake.

Referring to the operation of the improved winding machine, the armature to be Wound is first mounted in the guide block as shown in Figures 1, 9 and 10. The position of the armature is such that the slots into which th wires are to be wound are adjacent the guide surfaces 13 of the guide block. The armature shown has axial slots and the block is formed for such an armature. A different block would be provided if the slots were angularly related to the armature axis. The wires to be wound are then attached to the armature shaft by means of the cap 16 as best illustrated in Figures 9 and 10. When the winding machine is idle it will be in the position shown in Figure 3. Under such conditions the idler pulley will be away from the belt H and the belt in slack condition, therefore no power will be transmitted from the motor to the driving shaft 6. The ratchet wheel will have such a position that the stop pin 6| is in engagement with the stop arm 62, having been placed in such position by the weight 69. This will condition the ratchet wheel so that the cam bolt 59 carried by the ratchet wheel will be the desired distance from the beveled end 55 of the reciprocable rod 54. In the particular machine shown this distance is five teeth of the ratchet wheel since it is desired to give the armature five turns in winding the conductor wires thereon. If it is desired to give the armature more turns (as for example '7) the cam bolt 59 will be placed a greater distance from the beveled end of the reciprocable rod. This is accomplished by merely moving the cam bolt from the hole of the ratchet wheel in which it is shown to the hole 81 which is, by way of example, seven teeth from the beveled end of the rod 54.

With the wires in place and ready for winding the five turns can be placed thereon by merely grasping the handle 29 and pulling the arm 24 and the idler pulley forwardly. This will cause the brake to be released and idler pulley to tighten the belt ll so that power will be transmitted to the driving shaft 6 and thus rotate this shaft and the armature. The pulling forward of the arm 24 will move this arm out from behind the lug 58 on the rod 54, thus freeing the rod for movement towards the ratchet wheel under the action of the spring 56. The lug 58 will now move behind the arm 24, as shown in Figure 8, and thus hold the arm in the position where the idler pulley will maintain the driving belt tightened. The movement of the rod 54 towards the ratchet wheel will place the cam end 55 in position to be engaged by the cam bolt 59. Also simultaneously with the tightening of the belt the U-shaped arm 49 will be swung forwardly, thus rotating the shaft 46 and permit the lowering of the dog 39 into engagement with the ratchet wheel by the lowering of the arm 4!. The control pin 42 will also be positioned to prevent reverse rotation of the ratchet wheel.

As the shaft 6 is rotated by the belt the pitman 35 will cause a rocking of the rod 34 and through the dog 39 notch forward the ratchet wheel and cause it to have periodic limited rotations in the direction of the arrow of Figure 5. For each rotation of the driving shaft 6 the ratchet wheel will be turned a distance between two teeth. As the ratchet wheel is turned the cam bolt will be moved towards the beveled end of the rod 54 and when the shaft 6 has made the five desired rotations the ratchet wheel will have been notchedup five teeth and the cam bolt brought into engagement with the beveled end 55 of the rod 54. When this occurs the cam bolt will push the rod 54 away from the ratchet wheel and will remove the lug 58 from behind the arm 24. The arm, therefore, will no longer be held in a position where the idler pulley will place the belt under tension since it will be thrown rearwardly under the action of the spring 30. When this occurs the belt will become slack and the brake l3 will be applied to the brake drum carried by the driving shaft to thereby stop the driving shaft 6. When the arm 24 moves rearwardly the shaft 46 will also be rotated and the control arm 4| and the dog 39 will be lifted up thus freeing the ratchet Wheel. With the ratchet wheel now free the weight 60 will become efiective to cause a reverse rotation of the ratchet wheel to its starting position determined by the pin 6| and the arm 62.

The machine is now set for a new cycle of rotations so that the armature can be moved with another coil. This next coil is wound after the wires have been cut off from the previously wound coil and then again connected to the cap on the end of the armature shaft. The slots into which the next coil is to be wound are properly positioned with respect to the guide block by releasing the plunger through operation of the arm 69 and then turning the armature to the desired position after which it is again clamped. The new coil is then wound with its five turns by merely pulling forward on the arm 24 to lock it in position to tighten the belt. After five rotations of the armature the idler pulley will be released, the driving shaft 6 stopped and the ratchet again freed to return to 'its beginning position, all as previously described in detail.

If it is desired to make seven windings on the armature this can be done by merely setting the cam bolt in the hole 81. Other holes can be placed in the ratchet wheel as desiredin order to obtain any number of revolutions of the armature as will be obvious.

If in winding the armature it is desired to place an odd number of turns in each coil, this can be easily accomplished with the winding machine described. For example, if it is desired to have eleven turns to each coil the first ten turns are wound on the coil by operating the machine in the manner already described. To place the eleventh turn on the coil one of the wires is cut and then the head 8 rotated 'by hand one turn to thus cause the uncut wire to be given an extra turn. This will produce the eleven turns for the coil. In placing this extra turn on the coil the original setting of the machine will not be disturbed since during the single extra rotation of the armature it will not be necessary to start the cycle into operation. If the brake should interfere with the single rotation of the armature by hand the brake can be slightly released by pulling forward slightly on the arm 24, but not a sufiicient distance to tighten the belt or to lower the control arm and the dog. Generally the armature can be rotated by hand Without releasingthe brake as this brake does not need to be applied with any great intensity. Its main function is to apply such a braking force as to stop the rotation of the armature under its own momentum at the time the belt is slackened. Being aware of the possibilities of modifications in the particular winding'machine structure shown byway of example without departing from the fundamental principles of my invention, I do not intend that the scope of the invention be limited except in accordance with the appended claims.

What is claimed is:

1. In an armature winding machine, armature holding means, means for rotating the holding means including belt driving means and a movable member having positions for tightening the belt and connecting driving power to the holding means and for loosening the belt and disconnecting driving power from the holding means, means operable independently of manual effect for maintaining the movable member in the belt tightening position when so placed, and means for automatically releasing the maintaining means so that the movable member can move to the belt loosening position when the armature holding means'has been rotated a predetermined number of turns.

2. In a armature winding machine, armature holding means, means for rotating the holding means including amovable member having positions for connecting driving power to and disconmeeting it from the holding means, means operable independently of manual ellort for maintaining themovable member in the connecting position when so placed, means comprising ratchet mechanism having a toothed member and a cooperating dog for automatically releasing the maintaining means so that the movable member can move to disconnecting position when the armature holding means has been rotated a predetermined number of turns, means comprising a rotatable shaft and arm separate from the dog for lifting the dog of the ratchet mechanism from the toothed member, and means for rotating the shaft by the movable member when it moves to disconnecting position.

3. In an armature winding machine, armature holding means, means for rotating the holding means comprising a manually movable member having positions for connecting driving power to and disconnecting it from the holding means, means operable independently of manual effort for maintaining the movable member in the connecting position when so placed by manual efiort and comprising a spring biased reciprocable rod having a part directly engaging the movable member when in connecting position, and means comprising a cam operable by the rotation of the holdingmeans for directly engaging another part of the reciprocable rod and moving the reciprocable rod in a longitudinal direction against the bias of the spring to a non-maintaining position when the armature holding means has been rotated a predetermined number of turns.

4. In an armature winding machine, armature holding means, means for rotating the holding means including a movable member having positions for connecting driving power to and disconnecting it from the holding means, means operable independently of manual efiort for maintaining the movable member in the connecting position when so placed and comprising a springbiased reciprocable rod, means including a ratchet mechanism for moving the reciprocable rod to a non-maintaining position when the armature holding means has been rotated a predetermined number of turns, and means for automatically disabling the ratchet mechanism comprising a rotatable shaft rotated by the movable member when it is released by its maintaining means.

5. In an armature winding machine, means for rotating an armature holding means, a member movable to one position for establishing the rotation and to another position for stopping the rotation, a ratchet wheel, a pivoted dog, means for operating the dog to cause rotation of the ratchet wheel through a predetermined angle in one direction for each rotation of the armature holding means, means for moving the member to its stopping position when the ratchet wheel has been given a predetermined rotative movement, and means comprising a swinging element actuated by the member when the member is moved to the said stopping position for lifting the pivoted dog from cooperation with the ratchet wheel.

6. In an armature winding machine, means for rotating an armature holding means, a member movable to one position for establishing the rotation and to another position for stopping the rotation, a ratchet wheel, a pivoted dog, means for operating the dog to cause rotation of the ratchet wheel through a predetermined angle in one direction for each rotation of the armature holding means, means for moving the member to its stopping position when the ratchet wheel has been given a predetermined rotative movement, means operable when the member is moved to the said stopping position for lifting the pivoted dog from cooperation with the ratchet wheel, and means for automatically returning the ratchet wheel to its starting position when the dog is lifted.

'7. In an armature winding machine, means for rotating an armature holding means, a member movable to one position for establishing the rotation and to another position for stopping rotation, a ratchet wheel, a pivoted dog, means for operating the dog to cause a rotation of the ratchet wheel through a predetermined angle in one direction for each rotation of the armature holding means, a pivoted element for preventing reverse rotation of the wheel, means for simultaneously lifting the pivoted dog and pivoted element to non-cooperative positions with respect to the wheel, and means for operating the last named means by the member when moved to a position stopping rotation of the armature holding means.

8. In an armature winding machine, a shaft for rotating an armature, means for rotating the shaft, a source of power, a member for connecting the source to the shaft and disconnecting it therefrom, a ratchet wheel, a pivoted arm, means for rocking said arm back and forth about its pivot by a single rotation of the shaft, means comprising a dog carried by the arm and cooperating with the wheel to rotate the wheel through the distance between two teeth for each rocking movement of the arm, and means comprising a reciprocable rod and cooperating cam means carried by the wheel for reciprocating the rod and so controlling the member as to cause it to move from a connecting position to a disconnecting position when the ratchet wheel is moved to a position resulting from a predetermined number of rotations of the shaft.

9. In an armature winding machine, a shaft for rotating an armature, means for rotating the shaft, a source of power, a member for connecting the source to the shaft and disconnecting it therefrom, a ratchet wheel, a pivoted arm, means for rocking said arm back and forth about its pivot by a single rotation of the shaft, means comprising a dog carried by the arm and cooperating with the wheel to rotate the wheel through the distance between two teeth for each rocking movement of the arm, means for controlling the member to cause it to move from a connecting position to a disconnecting position when the ratchet wheel is moved to a position by a predetermined number of rotations of the shaft, means for releasing the dog by the movement of the member to disconnecting position, and means for returning the ratchet wheel to its starting position when the dog is released.

10. In an armature winding machine, armature holding means, means comprising a slack belt capable of being tightened for rotating said armature holding means, a pivoted arm, an idler pulley carried by the arm and cooperating with the belt for tightening it, means for maintaining the arm in a position to tighten the belt, means for releasing the maintaining means when the armature holding means is rotated a predetermined number of turns and comprising a ratchet mechanism, a shaft rotatable by the arm when moved to belt tightening and loosening positions, and means for controlling the operativeness of the ratchet mechanism by the shaft, said ratchet mechanism being operable when the belt is tightened and inoperative when the belt is loosened.

11. In an armature winding machine, armature holding means, means comprising a slack belt capable of being tightened for rotating said armature holding means, a pivoted arm, an idler pulley carried by the arm and cooperating with the belt for tightening it to transmit power, a spring for releasing the idler pulley, a reciprocable rod, means carried by the rod for cooperating with the aim to hold it in a position where the idler pulley tightens the belt, and means operable when the armature holding means has been rotated a predetermined number of turns for reciprocating the rod from the holding position to a position where the means carried thereby permits release of the arm and idler pulley by the spring.

12. In an armature winding machine, armature holding means, means comprising a slack belt capable of being tightened for rotating said armature holding means, a pivoted arm, an idler pulley carried by the arm and cooperating with the belt for tightening it to transmit power, a spring for releasing the idler pulley, a reciprocable rod, means carried by the rod for cooperating with the arm to hold it in a position where the idler pulley tightens the belt, means operable when the armature holding means has been rotated a predetermined number of turns for reciprocating the rod from the holding position to a position where the means carried thereby permits release of the arm and idler pulley by the spring, a brake for the armature holding means, and means for so controlling the brake by the arm that it will be released when the belt is tightened and applied when the belt is permitted to be slack.

13. In an armature winding machine, an armature holding means, means for rotating the holding means comprising a belt, an idler pulley for tightening the belt to transmit power to rotate the holding means, a spring for biasing the pulley to a non-tightening position, means for maintaining the idler pulley in tightening position when so placed, means for releasing the maintaining means, a brake, and means operable for applying the brake by the pulley spring when the pulley is in non-tightening position and permitting the release of the brake when the pulley is moved to tightening position.

u. 14. .In an armature winding machine, armature holding means,- means for rotating the holding means comprising a belt, an idler pulley for tightening'the' belt to' transmit power to rotate the holding means, means for normally biasing the pulley to a non-tightening position, a brake for the holding means; means for releasing the brake when the idler pulley is positioned to tighten the belt and for applying said brake when the pulley permits looseningof the belt, means for holding the'idler pulley in ,a'belt tightening position, and means. for' automatically releasing the pulley holdingimeans when the armature holding means is rotated a predetermined numberof turns.

7.15;In'an' armature winding machine, armature holding means, means for rotating the holding means to wind conductor wire thereon and comprising a belt,'a-pivoted arm, an idler pulley carried by the arm' for cooperation with the belt to permit tightening and slackening thereof so as to permitdriving and stopping of the armature holding means, a spring for moving the arm and pulley to a belt slackened position, a brake 12 for the armature holding means, means for con-' trolling the brake by the arm so that the brake will beapplied by the spring when the idler pulley is in a belt slackening position and released when the idler pulley tightens the belt, means for holding the arm in a belt tightening position, and means for automatically releasing the holding means for the arm when the armature holding means has been given a rotation of a predetermined number of turns.

JAMES M. ENGLAND.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,375,745 Wood Apr. 26, 1921 1,609,929 Carter et al. Dec. 7, 1926 1,890,111 Eaton Dec. 6, 1932 1,987,190 Holmes Jan. 8, 1935 2,144,477 Abrams Jan. 17, 1939

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