US1369855A - Method of and apparatus for winding transformer-coils - Google Patents

Description

w. H. THWAITVESY.

METHOD OF A ND APPARATUS FOR WINDING TRANSFORMER COILS.

APPLICATION FILED NOV. 22,1919.

Patented Mar. 1, 1921,

. 7 7 2 SHEETS-SHEET I.

gnoc/W l3 F 3 WILLIANHTWA\TES W. H. THWAITES- METHOD OF AND APPARATUS FOR WINDING TRANSFORMER COILYS. APPLICATION FILED NOV. 22, 1919. I 1,369,855, V Patented Mar. 1, 1921.

2 SHEETS-SHEET WILUAM HTrMAITs UNITED STATES PATENT. OFFICE.

'IHWAI'IES, OF GRAND RAPIDS, MICHIGAN, ASSIGNOB TO THWAITES X-RAY COMPANY, OF IGAN.

GRAND RAPIDS, MICHIGAN, A CORPORATION 01 MICE- To all whom it may concem:

Be it known that I, WILLIAM H. THWAITEB, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Methods of and Apparatus for Winding Transformer-Coils; and-I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relatesto a method of and apparatus for winding transformer coils. The transformer coil which is to be produced is of very short length and a plurality of the same are used in making'transformers for X-ray apparatus. The method of winding which I have devised permits the winding many thousands of turns of fine wire in a narrow space so that, a flat transformer coil is made and at the same time the wires are interlaced and bound together by a fabric thread which is twisted around the wire of the coil during the process of winding, this holding the turns of wire against displacement with respect to each other and furnishing a body which is capable of ab sorbing melted rosin or the like which, when hardened, leaves the coil secure against any disassociation of the wires which might per-' mit breakage in the.secondary circuit of the transformer of which the coil forms a part. Coils made by my method and with the apparatus which I have devised to carry out the method may be produced rapidly and perfectly without -the necessity of using skilled labor in any respect;

For an understandingof the invention reference may be had to the following de: scription taken in connection with the accompanying drawings, in which;

Figure-Lisafront elevation of an apparatus for winding the coils using my method of automatically winding a fabric thread continuously around the length of wire which makes up the coil. I

Fig.'2 is-a substantially central vertical section therethrough. C

Fig. 3 is a fragmentary taken above the thread. I V

Specification of Letters Patent.

Application flledNovember 22, 1919. Serial No. 339,822.

horizontal section guides forthe wire and- Fig. 4 is a horizontal section taken in a plane immediately above the drivlng motor Figs. 6 and .7 are, respectively, end and side elevation of the completed coil; and

F 1g. 8 is a fragmentary enlarged view showing the wires of the coil separated and lllustrating the intertwining! of the fabric threads.

Like reference characters refer to like parts in the different views of the drawings. In the construction of the apparatus which I have devised for carrying out the method, a supporting frame is made includmg two parallel vertical sides 1- connected at their lower and upper ends by cross pieces 2 and 3 and at a point between said ends by a cross piece or platform 4. A support 5 is attached toandextends upwardly from the upper cross piece or platform 3 from which a spool 7 is loosely mounted, the same carrylng a quantlty of wire 8 which is used in 'maklng the coil. This wire is very small in diameter and carries insulation throughout its entire length. In order to restrain the spool. from too free unwinding a flexible strap 9 is led over the spool and has a weight 10 attached to its free end the opposite end being secured to the platform 3. I have shown two of the spools with associated mechanism belowthe same so that two coils may be simultaneously wound, but it is apparent that the number maybe increased or that but one coil may be wound at a time as desired.

The wire 8 passes downwardly through an opening in the platform 3 and through the hollow conical core 11 on which the thread 12 used is wound in the usual manner. The core is secured to and depends from the platform 3. The wire with the" thread passes downwardly through a guide- 13 which is made as an eye in a length of wire 14 disposed horizontally between and connected at its ends to the sides 1 of the frame of the machine. In the present structure two of these eyes are formed for the two coils to be made. The wire leads down Patented Mar. 1, 1921. v

to and between two disks 15 secured on a shaft 16 which is detachably mounted in notches made in blocks 17 attached on the inner sides of the sides 1 of the frame and a vertical intermediate support 18 disposed between the lower and intermediate cross members 2 and 4'as shown. The wire and thread are wound around a core ring 19 which is disposed between the two disks 15.

" The shaft 16 is rapidly rotated through mechanism which will hereinafter appear and the wire 8 with the thread 12 around,1t is placed between the disks, the inner free end passing outwardly through a notch 15 in one of the disks. With the rotation of shaft 16 the wire 8 is drawn from the spool 7 under the tension imparted by the frlction brake 9, at the same time the thread multaneously operated by it. At one end of the shaft 23 a pulley 24 is fixed, an endless belt 25 passing around the same and a drive pulley 26 fixed on the motor shaft of a small electric motor 27 which is carried on the intermediate platform 4 of the frame. In th1s manner the shafts 16 are driven in the operation of winding the coils. 7

It is necessary that the wire and thread be i moved back .and forth between opposite disks 15 in order to secure the proper winding of the coil. To attain this the thread and wire for-a coil passes downwardly through guides 28 projecting forward from a slide bar 29 which is mounted on the upper side of the platform 4 and has a limited longitudinal movement thereon, longitudinal slots be;

in gmade through the bar 29 through which pins 30 pass servin as guides for the bar 1n its movements. he thread and wire ass from the guides 28 downwardly over s ort rods 31 and therefrom to the disks 15. To

operate the bar back and forth a lever. 32- is pivotally mounted at 33 between its-ends on and above the platform 4, its front end having pivotal connection w1th the bar 29 at one end. The rear end of the lever 32 carries a pin 34: which is received in a cam groove 35 in a drum 36 fixed to a shaft 3.7 mounted on one of the sides 1 and the intermediate vertical member 18 of the supporting frame. Rotation of the shaft 37 serves to turn lever 32 back and forth about its pivot and to give a limited reciprocatory mov'ementto the bar 29, this having the effect of moving the wire as it passes to the coil back and forth between the inner sides of the disks 15.

A pulley 38 is secured at one end of the shaft 37 and is driven by an endless belt 39 which passes around the same and also around asmaller driving pulley 40 secured at the end of the shaft 23 which is driven by the motor 27 as before described. The various pulleys are designed so as to give .the proper speed relations of the different shafts to each other.

The core thus wound is made up of an endless wire of very small diameter which has a fabric thread twisted around it for its full length. The threads crossing each other from one side to the other of the coil are interlaced andbound against each other and against the wire of the'coil making a solid mass which holds its form when taken from between the. disks. The coils need something of this character to hold the wires of the same together, particularly as the distance between the sides of the coils is small. After the coil has been made it may be dipped in melted rosin and the thread serves to absorb the same whereby, after the rosin has cooled and hardened, the coil is I solid and'firm against any accidental disarrangement or breakage of the wires therein. v

This method of winding transformer coils is very simple and effective. The apparatus needed is comparatively inexpensive and there is nothing that the operator need do except start a coil to winding and remove the coil from between the disks when it is Wound. Skil edlabor is not needed in anypart of the proceeding. The invention has proved of great utility in practice and is in continuous practical use.

- I claimz;

1. The herein described method of winding a transformer coil which consists in winding wire around a central core, simultaneously winding a fabric thread around the wire throughout the length of the same as it is wound on to the core, and moving the wire back and forth lengthwise of the core to evenly apply the same thereto, substantially as described.

2. An apparatus comprising a support, a central hollow core attached to and depending from the support, said core having a uantity of thread or the like wound around t e same, a spool on which a quantity of wire is wound mounted above the support, said wire passing downwardl through the central core for the threa and means around which both the wire and thread are wound to make 'a coil, the thread passing from'its core and turning around the wire automatically as it passes therefrom, substantially as and for the purpose described.

3. An apparatus comprising a support, a hollow core attached to and depending from the support, said core having a quantity of thread or -the likefwound around the same, a

. wire passing downwardly throu h the core,

means for supporting a uantity of said wire above the support, a s aft mounted be- 7 low the thread, spaced apart disks on the 1 around which both the wire and thread are shaft, a second core between the disks wound, and means to drive the shaft to wind both the wireand thread around said second corebetween the disks, substantially as described.

. 4. An apparatus containing the elements in combination claimed in claim 2 combined with means to automatically move the wire with the thread around it back'and forth between the inner sides of the disks, subis stantially as and for the purposes described.

i 5. An apparatus of the class described,-

comprising a supporting frame,having an upper cross member, a hollow core on which a uantity of thread or the like is wound attac ed to and depending from said upper cross member, a spool around which a quantity of wire is wound mounted above the cross member, the wire therefrom leading downwardly through the thread core, a shaft mounted at the lower portion of the support, spaced apart disks on the shaft, a

ring disposed between the disks, and means to rotate the shaft, both the wire and thread being led to and between the disks and "wound around the ring, substantially as described.

6. An apparatus of the character described containing the elements in combination defined in claim 5 combined with a bar mounted above the shaft for movement par- 'allel to the shaft, means to give said bar 40 limited reciprocatory movements, and a guide on said barthrough which the wireand thread pass, substantially as described. 1 7. An apparatus of the character described containing the elements in combination claimed in claim 5 combined with a tension device to act on the wire spool, said tension device consisting of a flexlble strap attached at one end to the upper cross member of the support and passing over the wire spool, and a weight connected to the free 'end of the strap, substantially as described.

8. An apparatus of the character described, comprising a supporting frame having upper and intermediate cross members, a hollow core around which a quantity of thread is wound attached to and depending from the upper cross member, a spool around which a quantity of wire is wound mounted above the upper cross member, said wire leading downwardly through, the thread core, a bar mounted on the intermediate cross member lengthwise thereof and adapted to have limited longitudinal movement, a lever pivotally mounted between its endson said intermediate cross member, and pivotally connected at its front end to the bar, a shaft mounted on the support, a drum having a cam groove therein, a pin atthe rear end of the lever extending into said

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