US1871349A - Adjustable holder for coil-winding dies - Google Patents

Description

Aug. 9, 1932. I s, w s N I 1,871,349 v ADJUSTABLE HOLDER FOR COIL WINDING DIES Filed Dec. 27, 1927 2 Sheets-Sheet 1 Z7 PIE 6 'E1E.6. Z7 m. '7. 25

'27 INVENTOR STE/v M/IDaTE/V I T w Y I ATTORNEY Ag. 9, 1932. a WADSTEN 1,871,349

ADJUSTABLE HOLDER FOR COIL W INDING DIES 'Filed Dec. 27, 1927 2 Sheets-Sheet 2 I T a 5 4 I film e5 W m r 6/ I G6 v 5 I 9 36 I 4614i 60 5 g i I 6? I w l 4 45 62 /,//W/// 5511. FIE-HO. m.12.

INVENTOR STE/v Moe TEN ATTORNEY Patented Aug. 9, 1932 STEN WADSTEN, OF IBLOOMFIELD, NEW JERSEY, ASSIGNOR TO W'ESTINGHOUSE LAMP COMPANY, A CORPORATION OF PENNSYLVANIA ADJUSTABLE HOLDER FOR COIL-WINDIN G DIES Application filed December 27, 192?. SerialNo. 242,715;

The present invention relates to-an improvement in coil-winding machines such as shown and described in the patent to J. W.

Ekstedt, 1,670,499 granted May 22, 1928 andassigned to the same assignee as is the present application.

In the above mentioned patent, a machine is shown for coiling fine hair-like wire to helical form in the absence of a mandrel and particularly for the production of such coiled wire to serve as filaments for incandescent electric lamps. The machine shown comprises mechanism for moving a wire through a given path when tangentially engaged by a pair of oppositely disposed driving rollers which drive the wire endwise into a cavity die from which the wire issues in the form of a continuous helix. Means are also provided for cutting the helix into sections of proper lengths to constitute filaments for incandescent electric lamps.

The die is so arranged that the cavity is positioned to-reccive the wire from the driving rollers, the bottom of the cavity beinginclined or grooved so that the wire is bent into a succession of coils which'pass over a lip or separator member at the edge of the die. The helix or successive turns of the coil which issue from the die are consequently spaced a given distance apart, and a helix is, therefore, provit ed of a certain diameter and pitch depending uponthe dimensions of the spacer member and the radius of curvature of the:

effective surface ofthe cavity as well as the position of the die with respect to the driving rollers.

In the manufacture ofrcoiled filamentary bodies which serve as electrical resistance elements when used as lamp filaments,-it is essen-. tial to exerciseextreme accuracy in the formation or" the coils, since each filament or coiled section must be made in accordance with specified dimensions so that each coiled section will have a length of:wire therein equal to the succeeding coiled section. Fur thermore, the diameter of the coil aswell as the spacing or pitch of the turns of the coil must be uniform.

The dimensions of the diameter and the proportions of the coiled sections vary for lamps of different Wattage, and the data relating to such dimensions and proportions are known as the rating so that a coiled section for a givenrating must be made in accordance witha predetermined set of dimensions. For example, a filament for a watt, 115 voltlamp must contain a length of'wire of 517 mm., it must have a coil diameter of .0108 inches and the coiled section must contain 398 turns per inch. The diameter of the wire also varies in filaments of different wattage lamps .and the diameter of the wire of a coiled filament for a 60 watt lamp is preferably .0018? inches.

It will be obvious that in order to produce a.

such as a diamond. A diamond die, although I having indefinite life, is difficult to produce, and owing to variations in the properties of'a diamond, it is very often brittle to the extent that portions of the coil-winding lip are broken off rendering the die inoperative for the purpose intended.

7 As set' forth in the saidpatent, the coil Winding die may-be constructed from hard-- ened steel, but inasmuch as the wire passing over the die results in excessive wear, it is necessary to replace the steel die at shorter intervals than is necessary with a diamond die. Ordinarily the replacementof'one die for another would ofier a considerable disadvantage since when applying a die into position for the winding of'a coiled filament it is necessary to adjust the die in several planes until the cavity is accurately located in such position that the diameter and pitch of the coil produced will be in accordance with the data supplied for the rating of the particular lamp for which thefilament is to be used.

When using a diamond die, the die remains in the machine for such a long period that the amount of labor and inconvenience involved in a change from one die to another is negligible. A steel die, although easier to produce, must be changed at comparatively short intervals, and the advantage given by the facility accompanying the production of the die is lost by the time and labor involved in replacing the same.

7 An object of the invention is to provide a means for forming a die adapted to cooperate with means for holding a die in a given coil winding position.

Another object of the invention is to, provide a die having a coil-winding cavity disposed in a predetermined relation to the axis of the die.

Other objects and advantages of the invention will be more fully understood from the following description.

In practicing the present invention, I first employ what may be termed a master steel female die blank and inone end thereof, a cavity is formed by means of any suitable high-speed rotary lapping wheel of the prop er size. This master steel female blank is then hardened and drawn .to proper temper sionis obviously equal in dimensions tothe.

cavity of the female hob. The master male die being thus produced may then be hardened and tempered. An unhardened die blank or rod may then be "forced against the end of the master male die until the die blanktakesa depressionor cavity from the master male die, thus the coil-windingcavity is formed in the dieblank and a coil-winding die is produced which may then be hardened for use in a coil? winding machine.

The method of forming the dieblank is, however, utilized to make it pos-' sible toalways produce the cavity inproper position for a coil-winding operation. This is accomplished by providing means for 10 eating a point or spot upon the die rod and in providing means in a holder of the coilwind-mg machine for engaging the said point or spot sothat each die rod will be held' in the coil-winding machine in a position as deter-' mined during the formation of the cavity. By reason ofthis method, the first coil-wind ing die produced may be inserted into the die holder of a machine andsecured'inth'e predetermined position. The die holder may then be adjusted until the die is-so positioned as to produce a helix of the proper pitch and diameter. The coil-winding 'oper atlon may then be continued until it is neces- Sary to substitute a new die.

cavity in the . sions 18 and 19. The extension 19may a forcescrew20 passing through a threaded aperture, and a retainer member 21 may be Inasmuch as the next die produced is provided with a point or predetermined spot to be engaged by means in the holder of the coil-winding machine, the said die will take exactly the same position as was occupied mined dimensions.

The invention will be more fully understood by reference 'to the accompanying drawingsin which:

Fig. 1 shows a portion of a. female hob for producing a master male die; I

r Fig. 2 is. airend View. of the hob shown in Fig. 1; 1

Fig. 3 is a fixture employed for forcing a master male blank against the-hob to produce the master male die, and alsofor forcing the master male die against-the die blank to produce the coil-winding die;

Fig. 4 is a sideelevational' view of the master male die; 7

Fig.5 is an end view Fig; J

. Fig. 6 is a cross-sectional view. of a portion ofthe fixture'shown in Fig. 3;

, Fig. 7*shows a die in the'form of a rod of the die shown in one end thereof; 1

Fig. 8 is an end view of the die shown in Fig. 7 I

Fig. 9 is a fragmentary perspective view of a coil-winding machine and shows a die holder as employed for supporting the die;

Fig. 10 is a detailed view of the die holder partly in section; a

Fig. 11 is a view of one end of the die holder shown in Fig. 10 ;and

having the die. cavity properly disposed at Fig. 12is a view of the opposite end of the die holder shown in Fig. 10. In practicing the present'invention, a hob 10 may be provided of any suitable material, preferably of steel which may be hardened and tempered to the proper degree. The hobmay be provided'with a tapered end 11 terminating in a surface 12' and any suitable high-speed rotary lapping wheel 13may be employed to produce 'a' slot 14:, in the surface 12. "The lapping wheel 13 may be of such dimension as to produce the cavity 14 of the proper depth length and width.

The female hob thus produced, may be hardened to serve for the making of a male hob or matrix 15. This is accomplished by providing a fixture 16 comprising a. member 17 formed to provide abutments or extenhave provided to receive ends of the hob 10 and a rod 22 from which the male hob is to be produced. The retainer member- 21 may have a flattened lower portion 23 for disposition on a surface 24 between the extensions 18 and 19 and guide members 25 may be provided to hold the retainer member from lateral movement. When the rod 22 and the female hob 10 are disposed in the retainer member, the set force screw 20 may be actuated to thrust the ends of the said hob and rod together, thus causing the metal of the rod 22 to flow into the cavity in the female hob, thereby producing a projection 26 which has the same dimensions as the interior wall of the cavity in the female hob. The male hob thus produced may then be hardened and used to produce a coil-winding cavity 27 in a die rod 28 in the same manner as described for producing the male hob.

For the purpose of obtaining an accurate position of the cavity in each die rod pro duced, the die rods as well as the hob are provided with flattened portions 29 and 30 respectively, and set- screws 31 and 32 are provided to engage the flattened portions and thus hold the die rod and hob in proper relation during the formation of'the cavity. The set-screws do not, however, hold the hob and die rod against longitudinal movement for the formation of the cavity.

Furthermore, the die blank is provided with a four-sided taper as shown in Figs. 7 and 8 and the cavity 27 is so disposed as to be adjacent to one side of the end of the rod, thereby'permitting the edge 27 of the cavity to serve as a coil separating lip. It is obvious that if desirable, the cavity may be formed in any position on the end of the blank and the side of the blank ground down to provide a coil separating'lip. By means of the present method, the cavity may be made in exactly the same position on each die produced.

In addition to the operation of forming the cavity in the die rod, the retainer member 21 of the fixture 16 is provided with an aperture 33 so that after the cavity has been formed in the die rod the hob and die .rod may remain in fixed relation and a drill or other tool may be inserted through the aperture 33 to spot the die rod, forming adepression 34 to receive the end of a set-screw when the die rod is placed in a holder of a coil-winding machine, thus making it possible to accurately position each die rod in a manner to be presently described.

The coil-winding mechanism selected for use in connection with the above described apparatus is substantially the same as that disclosed in the above-mentioned patent, only such portion of the mechanism being shown as to clearly illustrate the present invention.

As shown in Fig. 9 the coil-winding mecha.

nism may comprise a pair of wire driving rollers 35 and 36, the roller 35 being mounted in an oscillatory bearing 37' pivoted at 38. The said roller 35 is provided witha shaft extending through a bearing 39. Whenthe roller 35 is disposed in operative relation to the roller 36, both rollers frictionally engage a wire 40 and the shaft of the roller 35 is so arranged as to be connected with mechanism for rotating the roller. The bottom roller 36 is provided with a shaft to efiect its rotation.

at 43to a spindle 44, the said spindle being disposed in a bearing 45 provided on-the body of the coil-winding machine. By reason or" the pivot 43 and the spindle 44, it is pos sible to move the casing 42 in a vertical and horizontal plane so as to adjustthe' die with relation to the wire driving rollers. -Inasmuch as the die 28 is supported by the holder, an adjustment of the latter causes an adjustment of the die.

tis essential, however, to provide a more accurate adjustment of the die, and for this purpose a sleeve 45 is fitted to a suitable bore 46 in the casing. The sleeve 45 is provided with a longitudinalpassage 47 to receive the die or die rod 28 and may be termed a die sleeve or collar. A setcrew 48 is provided to engage the notch or depression 34 in the die rod to hold the same in a predeterminedrelation to the sleeve. An adjustment of the die rod about its longitudinal axis may be obtained by a rotary movement of the sleeve 45. For this purpose, the sleeve is provided with a yoke 49 having a split head 50 and a clamping screw 51 may be provided to secure the yoke to the sleeve 45. Arms 52 and 53 of further adjustment of the die rod'is accomplished by providing a set-screw 57 which extends through a threaded aperture in the yoke 49 and abuts against the casing 42. Thus bya manipulation of the set-screw 57,

the sleeve and consequently the die may be moved toward or away from the wire driving rollers 35 and-36. For the purpose of clamps ing the sleeve in its final position, the casing 42 is split at 58 and a clamping screw 59 is provided.

" ment elements, the position of the holder 41 j ustment of the holder 41 and the said slide member may be screwed in position by setscrew 64. For the purpose of adjusting the control arm to regulate the position of the holder 41, set- screws 65, 66, 67 and 68 are provided. Set-screws 65 and 66 engage with the end 60 of the control arm to raise or lift the control arm and adjust the holder 41 vertically about the pivot 48. The set- screws 67 and 68 engage withopposite sides of'the end 60 of the control arm 54 to adjust theholder 41 laterally or in a horizontal plane, which adjustment is possible by reason of the spin dle 44 j ournaled in the bearing 45.

From the foregoing,it will be evident that coil-winding dies may be produced in a simple and accurate manner by first making the male hob 15. As shown in Fig. 6, when the die rod is in position andan aperture has been formed in the end of the die rod 28 by reason of the hob 15, the die rod'may be spotted through the aperture 33. The distance between the end of the die rod and the center of the'aperture '33 whichisindicated by a letter X, may be of any selected dimension; having once been determined,however, this dimension is maintained. The die rod,

after being spotted to produce the depression 34, is then applied to the sleeve 45 of the holder 41 and the set-screw 48 is screwed downwardly until the end of the screw'enters the depression 34, thus determining the dimension between the center of the depression and the end of the die rod, which dimension is indicated in Fig; by the letter Y.

After the die has been positioned in the holder, the holder is adjusted to proper relation with the driving rollers and 36, and the wire is then forced into the die from which it issues in a series. of successive coils to produce a helix.

The formation of the helix asabove mentioned, must be extremely accurate as to pitch and diameter so that if a coil isto be made for use in a given watt lamp certain rating data are supplied and the coiled wiremust be made to comply with the dimensions which are predetermined. In order toea-ccomplish By reason of the above-mentioned adjusts this, it is' not only necessary to provide a. die with a spacing lip, but to so adjust the die with relation to the path of movement of the wire that the exact diameter of the helix will be obtained and the exact pitch or spacing between the successive coils will be obtained. r

This operation isimportant and is clearly described in Patent Number 1,795,767 issued March 10, 1931, to John W. Ekstedt. r After the holder has been adjusted so that the die willlie in its proper relation to the wire-driving rollers and a coil of the proper proportions and dimensions is produced, the die may remain until such a number of coils have been produced as to cause a wear upon the die. A die'ma-y then be produced by the method as above described, and it is not necessary to make any further adjustments with respect to the holder but the new die may be applied ,tothe holder and by reason of the predetermined spot or depression 34, the said die may be quickly and accurately positioned in exactly the right relation to the path of movement of the, wire or the wire-driving rollers to produce a helix of exactly the same dimpnsions as produced by the die previously usec w A die'produced by the present apparatus has the advantage of being more durable. than "one produced byinerely cutting away the material to produce the cavity. twill be evident that by reason of the present device, the material which occupied the space of the cavity-is-forced away or compressed so that the surface or wall of the cavityis of greater density than the surrounding metal and more resistant to wear.

From the foregoing, it will be evident that the present apparatus makes it possibleto utilize a coil-winding die which need only be of a material suflic-iently hard to produce a reasonable number. of lamp filaments, since ,owing-to the present method, no material loss of time or inconvenience by the renewal of the die is encountered.

The present invention, therefore,-eliminates the necessity of providing a die of a material such as a diamond which requires expensive labor by skilled workmen for its production as well as a relatively long time interval-for its its production; The present apparatus,re-, duces the cost of manufacture offine coiled filamentary bodies by avoiding the use of an expensive tool subject to breakage, and fur- 1- thermore, provides a machine, in which a die may be made and applied after the first installation without any special or usual skill on the part of an operator. Althougha preferred apparatus is'shown and described herein, it is to. be understood that modifications may be made therein without departing from the spirit and scope of the invention as set forth in the appended claims.

embodiment of the 2.1.

What is claimed is:

1. In a coil-winding machine including a die and wire-driving means for moving a wire into said die, the combination with a die holder, a sleeve for supporting a die, and means for adjusting said sleeve relative to said holder to position said die in a given relation to said wire driving means.

2. In a coil-winding machine including a die and wire-driving means for moving a wire into said die, the combination with a die holder, a sleeve for supporting a die, and means for reciprocating said sleeve along its longitudinal axis and for rotating said sleeve about said axis.

3. In a coil-winding machine including a die and wire-driving means for moving a wire into said die, the combination with a die holder, a sleeve for supporting a die, means for reciprocating said sleeve along its longitudinal axis, and means for rotating said sleeve about said axis and means for adjusting said holder.

In testimony whereof, I have hereunto subscribed my name this 22nd day of December,

STEN WADSTEN.

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