US2678171A - Coil winding machine - Google Patents

Description

J. H. G. CRITCH COIL WINDING MACHINE May11`, 1954 Filed March 5, 1952 2 Sheets-Sheet l a 2 G. F

May 11, 1954 J. H. G. cRlTcH con. WINDING MACHINE 2 Sheets-Sheet 2 Filed March 5, 1952 [NVE/V70@ J.H.G.CRITC H W N m ATTORNEY Patented May 11, 1954 .tTENT oEFlcE COIL WINDING MACHINE John Henry George Critch, London, England, assignor to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Application March 5, 1952, Serial No. 274,939

y 2 Claims. 1

The present invention relates to coil winding machines and more particularly to machines for winding wire coils on toroidal formers or cores.

According to the invention there is provided a machine for the application of wire or the like to toroidal cores on formers comprising a circular metal ring broken only at one point and capable of distortion about the break to permit access to a cavity in the ring and to permit a toroidal core or former to be threaded on the ring, said cavity having an aperture associated therewith through which wire or the like is delivered from a bobbin located therein.

This and further features of the invention will now be particularly described with reference to the accompanying drawings in which:

Fig. l shows a shuttle ring dellected at its joint to permit the introduction of a core or former about `the ring `and the insertion of the wire supply bobbin in the ring.

Fig. 2 shows, to a larger scale, one view of the unloaded bobbin located in the shuttle ring;

Fig. 2A shows another view of theunloaded bobbin located in the shuttle ring;

Fig. 3 shows diagrammatically the shuttle ring f.

applying wire to a core: the turn being applied is shown at varying instants in one revolution of the shuttle ring.

Fig. 4 is a section of the arrangement shown in Fig. 3.

Fig. 5 is a simplified side view of the machine.

Fig. 6 shows a front view of the shuttle ring driving mechanism from which the coil traversing mechanism has been removed for the sake of clarity.

The` parts of the embodiment as shown will iirstly be described individually and the way in which they are mutually associated will become clear later.

A shuttle ring l, Fig. .1, of circular cross-section is cut through (radially) at one point. ln one of the (circular) faces thus provided, a cylindrical cavity V3 is drilled and subtends, in the direction of the centre of the ring, a slot Il, see

particularly Fig. 2, and Fig. 2A, which may eX- bobbin pivot and is arranged, by being compressed between the locating stud and the upper bobbin ange 9A or between the lower bobbin flange 9B and the bottom of the cavity 3, to retard the rotation of the bobbin and so apply a tension to the wire being fed off it. Suitably selected springs will give the required tensions for different wire gauges.

The shuttle ring is supported on three or more rollers l5A, |53, |5C Fig. 5 of which at least one 5A is capable of being driven to drive in turn, either by friction or by more positive means such as rack and pinion the said shuttle ring. One or more of these rollers may be temporarily removable to facilitate the opening of the shuttle ring.

The winding former or core 2, Fig. 3 is held in a clamp I6 which can be rotated continuously or in discrete steps about the shuttle ring through a total angle of at least 180 degrees. The auto* matic traversing of the former is driven by means of the worm 2| which is situated on shaft 32, said shaft being common to a pair of large bevel gears 26 and 2l one or other of which drives in turn bevel gear 28 which extends the means of driving to roller 15A via bevel gears 29 and 3G. The clamp may be rotated about the shuttle ring independently of the worm-wheel. This condition is provided for by disengagement from the worm-wheel 2D of a locking pawl il which is normally kept in engagement by the pressure of a spring I8. The disengagement of this pawl permits the clamp to be rotated inden pendently of the worm-wheel and to be reloched in any position.

A manually operated version of the machine Figs. 5 and 6 may be driven by means of cranking handle 23. The cranking handle is connected to spindle 32 Fig. 6 which carries two bevel gears 25, 2l and the worm 2l. The worm `rotates the core about the shuttle ring in the manner already described. The two bevel gears are part of a reversing gearbox driving the shuttle ring in both directions of rotation and well known. The shuttle ring is shown driven by roller ISA which is secured to spindle Jil. Also secured to spindle 3l is one of a pair of bevel gears 29 and 30, 29 being connected to bevel gear 28 which is part of the reversing gearn box. The shuttle ring reversing facility is under control of the knob 24.

Since the feed-01T aperture 4 is on the inner periphery of thering the wire will be applied virtually in a radial manner to the core or former andthis is generally desirable in toroidal coils.

Vthe core, two guide plates I3, I4, Figs. 3 and 4 are tted to the machine to produce a passageway through which the wire passes.

One of the guide plates backing plate I3- is rigidly `fixed to the main body I the machine and one surface provides a plane which is offset from the centre line of the shuttle ring by an amount equal to one half the overall diameter of the wire being used. This arrangement is shown exaggerated in Fig. 4. The other plate, i. e. the loop controlling plate I4 is spring loaded and when there is no wire between the plates, is pressed lightly against the face of the backing plate I3. The working face of the backing plate may be covered with some material e. g. baize or velvet. Means (not shown) are provided to tilt the loop controlling plate about an axis vertical and in a plane substantially parallel to the loop controlling plate. This is to ensure that the loop of wire, while entering the back of the loop controlling device unoler nogreat pressure is progressivelyV squeezed tighter between the plates I3 and Irl as the wire. loop reduces insize and thus Y ensures that the loop of Wire is rmly controlled right up to the instant at which it falls clear of the plates I3 and I4 and is pulled down on to the coil former. During winding the wire in moving through the passageway forces the loop controlling plate away f rom the backing plate and the lighty tension holds the wire in the desired plane during the formation of the loop. This tension also serves to maintain the turn just previously applied to the core or former in position While the formation and application of the ,sub--V` sequent turn is carried out. By this means a turn applied to the former is constantly under Ytension until the next turn is applied thus obiwhich need to Vbe moved to permit the opening of the shuttle ring I are pulled away in welllniown manner and the joint is opened. The core or formerV 2 is Vthreaded overthe said ring, in-

serted in the clamp IS and centralised about the bobbin by pulling the loose end projecting through the shuttle ring slot d. This is necessary for the formation of the iirst turn and also checks the bobbin for free rotation. The loop controlling plate- Ill is swung into its operating position.V To bring the core or former into the desired' position for the commencement of winding, the pawl I? is disengaged and the clamp swung and relockedfto the worm-wheel where required.

By turning the cranking handle 23. the ring willrotate,y being driven via the two sets of bevel gearing 21, 2BV and 29, Sil the spindle 3.1I andl roller A, and each. time the bobbin. passes through tlie core or former aturn of: wire will be applied 4 to it. At the same time the core or former is traversed about the ring by distributing the winding evenly. f

One cycle of the shuttle ring will now be described in detail with reference to Fig. 2. It is first assumed that the position of the bobbin is just above the top surface of the coil former and that no wire has yet passed through the eyeoi the former. Viewing the machine so that the ring is seen in side elevation with the core clamp to the left-hand side, the ring will be assumed to rotate in an anticlockwise direction. Y

As the cranking handle is turned the bobbin will pass downwards through the eye of the core taking the trailing end of the wire with it. This end may be anchored about the clamp or held by hand until several turns have been'applied when it may be allowed to go free. Further rotation will cause the bobbin to arrive at a point roughly diametrically opposite the core clamp. The wire then stretches across the full diameter of the ring and lies, lightly clamped, between the backing and controlling plates I3 and il in position AA'. The rotation of the shuttle ring continues and the bobbin passes through'points B', C', and D', during which a loop is formed and is progressively decreased. During this process the part or the locp stretching back to the core or former is kept taut by the backing and controlling plates.

The rotation further continues until positions and GG are passed and the loop is about to be drawn about the fore. During the whole of this time the loop is held by the two plates it 'andrifL and only as the loop goes from position G to positionrH Where it is being drawn down tightly on to the core is the tensionon the loop momentarily relaxed and the loop is immediately tightened on the core. By this time Vthe bobbin has reached point H and when it travels tov A' a short additional length of wire is automatically withdrawn from the bobbin. Y The cycle is repeated until the desired number of turns is applied. Any well-lanown mechanical counting device may be coupledy to the machine to count'the number of turns automatically.

When the desired number of turns has been applied, the wire from the bobbin islbroken oi Yand the end of the coil secured. The roller or rollers iare once more moved'and the upper part of the shuttle ring deiiected toipermit the removal of the coil after it has been released from the clamp.

One half ofthe coil has now been wound and the other half is wound in an exactly similar Y manner by replacing the former with the wound portion under the clamp.v 'A near-exhausted bobbin may be replaced by a fullyV charged one Y described above in connection with specic embodiments particular modiiications thereof,

it is to be clearly understood that this descrip- Y unitary ring, a bobbin, said ring having a cavity therein adapted to receive said bobbin, said ring having a single break therein at said cavity and being of resilient material adapted to be spread at the break to enable slipping the core on to the ring and to enable the bobbin to be inserted into and Withdrawn from said cavity, said ring having sufficient resilience to return to its normal shape upon release of tension thereon.

2. In a machine for winding toroidal coils on a hollow coil core, a revolving shuttle in the form of a unitary ring having a cavity therein adapted to receive a bobbin, said ring having a single References Cited in the ille of this patent UNITED STATES PATENTS Name Date Potter Oct. 19, 1926 Number

Images