US1780609A - Machine for making spaced coiled filaments - Google Patents

Description

NOV. 4, 1930. s, w s 1,780,609

MACHINE FOR MAKING SPACED COILED FILAMENTS Filed July 26, 1928 s Sheets-Sheet, 1'

ATTORN EY Nov. 4, 1930. s W EN i 1,780,609

MACHINE FOR MAKING SPACED COILED EILAMENTS Filed July 26, 1928 j 3 Sheets-Sheet, 2

Illiii HIHIQIII'HH HM ll INVENTOR STE/v 1M4 0s TEN ATTORNEY NOV. 4, 1930. 5\[w 5 1,780,609

MACHINE FOR MAK NG SPACED COILED FILAMENTS Filed Jiily 26, 1928 3 Sheets-Sheet, 5

INVENTOR Y STEN WAD TEN ATTOR E Patented Nov. 4', 1930 (UNI EDfQsTATEs PATENT OFFICE sa nt:lwnnsrnngjonfnnoomrrnnn; NEW JERSEY, assrsnon To WEST NGHOUSE LAMP company, aconronarion or PENNSYLVANIA MIAGII-IINE FOR MAKING srAcEnooILEn FILAMENTS jApplication filed Ju1y'26,

electric lamps, to produce-the coiled body in? the absence of a-mandrel. A coiled body such: as a light source or lamp filament when produced WltllOllt the aid of a mandrelmay be 1 manufactured at a? lower cost and higher speed inasmuchas the operationof re1noving the mandrel is eliminated; v A machine for producing a coiled filament body, astor in stance a lamp filament,is shown anddescribed .29 in Patent 1,670399. The abovementioned copendingapplication, however, shows animproved form of coil Windingdiewhichmay be used in connection With the inachinedis closed inthesaid patent. 5 I V The coil Winding die, as set forth in the said copending application, isproduced by. providing a coiled Wire helically WOIlIlCl'llPOIl a mandrel and With the turns of the coil in contactingrelation so as to make What is termed 8 a closed coil. This coil is used as a primary embossing rn'atrixandiis suitably supported so that a pair of dieblanks,in the form of discs of relatively softmet'al, may be disposed With their edges or peripheries in contact with 7:35 opposite sides ofthe coil. The blanks may then be rotated in the presence of sufficient force, to compress them'upon the embossing matrix during a rollingmovement of the blanks over the-matrix, Which movement may tained in the blanks," i

Another or second embossing matrix may thenbe provided by Winding a wire upon a mandrel with the spaced'relation of the turns T49 continue until an initialdepressionis ob- .1 of the coil of a predetermined degree or pitch f in accordance with the desired pitch to be ob tained in the die 1 produced. and consequently in the coilproduced by means of the. die. Blanks vvith'the initial'depression therein I may then be rolled over thesecond embossing 192s. Serial'No. 295,536.

matrix in the presence of suflicient force to compress the blanks with an impression of the properlyspaced coil. The blanks maythen be h'ardenedand employed as coil Winding elements or dies in amandrelless coil Winding machine. y

In the manufacture of certain types of incandescent electric lamps, the light source or filament therefor is formed from a highly refractory Wire such as tungsten, coiled to helical form. Certain types of filaments are w ound in continuous helixes and severed to given lengths, each lengthbeing of such dimensions as to have the required resistance for a given type lamp. Filaments of this char- 'acter are usually secured to the leading-in conductors of the lamp by clamping or Welding directly to the coiled end of the sections.

When securing a completely coiled section to y a leading-in Wire, certain disadvantages arise in that the clamping or Welding operation may include more or less of the coiled sections thus changing the. effective filament length 1 and consequently changing'the resistance of the element to the end that the desired rating of the filament is altered. It 1s desirable, therefore, in certain cases, to produce a coiled section hav ng straight portions as terminals so that the Welding or clamping operation for securing the ends of thecoiled section tothe lead-in Wire is facilitated. When straight ends are provid ed as terminals for a filament, the weldingor clampingoperation, tosecure the filament to leading-in conductors, may be accomplished in a more uniform manner, thus mak-:' ing the mounting operation more accurate.

I-Iereto'fore, filament Wire hasbeen Wound to helical form so as to produce a seriesof sections elf-closely ound turns of Wire separated .by one or more turns of-greater pitch than the turns composingthe closely Wound sections, thus providing. relatively closely Wound sections of Wire terminating in uncoiled or comparatively straight portions. The above operation,fhowever, has previously been performed on What is known as a mandrel Wound coil inding machine and the spacing of the coils was accomplished by changing the relative movement of the mandrel and the degree of rate of winding.

It is an object of the present invention to ,rovide means for en ortin and mani ulating the above described coil winding die so as to produce aplurality of coiled sections of a given pitch separated by sections of a different or greater pitch.

Another object of the invention is to provide a machine for automatically winding coiled sections separated by uncoiled portions of wire. 7

Other objects and advantages of the invention will be more fully understood from the following description, together with the accompanying drawing, in which:

Figure 1 is a plan view of a portion of a coil winding machine showing the present coil winding die in operative relation thereto;

Figure 2 is a side view the mechanism shown in Figure 1;

Figure 3 shows a modified form of means for holding the die to produce spaced coils in accordance with the present invention;

Figure 4 is a side view of the oie and support shown in Figure 3;

Figure 5 is a top view of the port shown in Figure 3 Figure 6 is an enlarged view of a coil winding die in position to receive the wire from the driving roller; v

Figure 7 is a fragmentary view of the die shown in Figure 6 and illustrates different relative positions between the die and'the driving rollers; and

Figure 8 is a fragmentary side view of the die and supdie in position adjacent tothe driving rollers.-

. Although the present form of coil winding die may be associated ith various types of mechanismfor driving a wire, it isshown and described in connection with a coil winding machine ofthe character disclosed in the above mentioned patent, in which a pair of driving rollers 10 and 11 are provided to drive a wire 12 which may be received from a spool or any other suitable source not shown. The rollers 10 and 11 are rotated at high speed by suitable means, not shown, in the present drawing. The roller 10 is mountedin aplate 13 hinged at 14 in bearings 15 and 16 and the roller 11 is journaled in the frame of the machine. T he rollers 10 and 11 are provided with circumferential grooves 10 and 11,

each havin a denth sli htl 7 less than the diameter of the wire so as to frictionally engage the same when the plate 13 is inposition to dispose the roller 10 adjacent to the roller 11.

A rotation of the rollers 10 and 11 causes a movement of the wire 12 toward a die 17 more clearly shown in Figures 6 to 8, so that the wire engages with a groove 18 and issues from the die'in the form of a coil 19. When the driving rollers are continuously operated to drive the wire into the die, a continuous helix is produced.

For the purpose of intermittently terminating the coiling operation, means are provided for changing the relative posit-ion of the die and the rollers at intervals. This means may comprise a plunger 20 slidable o in a bearing 21. The die may be mounted on a pin22 at an upper end 23 ofthe plunger and maybe provided with aratchet wheel 24 engageable with dogs 25 and 26 pivoted on the bearing 21. Thevratchet mechanism is provided so that the die will be normally held in a given position and by means of an adjustment of the dogs the die may be rotated to position anew groove for a coil winding operation. The bearing'21 is mounted on a bracket 27 pivotally connected at 28 to a shaft 29 loosely fitted in a bearing 30. The bracket 27 is provided with an extension 31 having an arm 32 provided with a split collar 33 surrounding the plunger 20 to providea guide bearing.

The lower end 34 of the plunger 20 is pro vided with a swivel connection 35 having an arm 36 pivotally connected to one end of a lever 37 pivoted at 37, the opposite end of the lever being pivotally connected to an end 38 of a push rod 39. Thispush rod may be supported in bearings 40 and 41 and is providedwith a beveled lifter plate 42, an end of which is disposed beneath a projection 43 integral with the plate 13 so that a movement of the'lifter' plate 42 results in slightly elevating the plate 13, thus lifting the roller 10 from engagement with the wire 12 and terminating the movement of the wire toward the guide, t

The lifter plate 42 is provided with a slot 44 through which a pin 45 extends, the plate 42 being slidable along the push rod and adjustable by means of a set screw 46. Thus the lifter plate may be adjusted so as to lift the roller 10 exactly the :proper amount to release the wire without permittingthe wire to escape from between the grooves 10 and 11.

The mechanism for causing a movement of the lifter plate may comprise the cam 47 mounted on a shaft 48 and rotated in timed relation to the other mechanism by suitable connection, not shown. The cam 47 engages an abutment 49 secured to the push rod 39, a spring 50 serving-to normally maintain the abutment in contact with the cam. Thus a rotation of the shaft 48 will cause the push rodto move in the direction of the arrow X, thereby moving the plunger 20 downwardly carrying the die away from the rollers.

After a section'of, wire has been wound con taining the proper number of turns, the cam operates causing the push rod to function to remove the die a predetermined distance from the driving rollers. When the die has reached its lower position, the lifter plate operates to terminate the movement'of the wire and a continued rotation of the cam will permit the spring to bring the die back to its coil winding position and the lifter plate will cause the roller 10 to engage with the wire and the coil winding operation will be continued. It has been found that after a series of coils are woundand the coil winding operation is interrupted intermittently at given intervals by reason of theformation of the cam a plurality of coiled sections are produced, separated by sections of substantially straight wire or wire having a coil of an extremely large pitch.

It will be noted that when the lever 37 is'oscillated to cause areciprocal movement of the push rod, a slight rocking action is imparted to'the die 17 since thesupporting structure for the die is movable on shaft 29 in bearing 30. This rocking or sidewise move-' ment of the die tends to dislodge a coiled section or slightly bend the wire adjacent to the said section so that after the die has been lowered and then returned to its operating position the starting of a new section will be facilitated. After a number of coils have been formed or after each coil is made,

mechanism may be provided for cutting the wire intermediate the coiled sections.

The above described mechanism illustrated one means for interrupting the coil winding movement by a bodily movement of the die.

with respect to the driving rollers. In Figures 31:0 5, however, mechanism is provided wherein a die 17 is mounted on a spindle 51 carried at one end of a bracket plate 52. Secured to the die is a rigid Wheel 53 and adj acent to the rigid wheel and pivotally connected to the spindle 51 is a rocker arm 54.

A dog 55 is pivotally mounted on the rocker arm at 56 and held in contact with the teeth of the ratchet wheel 53 by a spring 57. An oscillation of the rocker arm 54 operates to cause an intermediate rotary movement of the die. Mechanism for rocking the arm 54 may comprise a cam 58 mounted on a shaft 59 driven through any suitable source of power, not shown. The cam 59 is engageable with a lug 60 on the arm 54 and a spring '61 normally maintains the lug contact with the cam. The arm 54 s provided wlth an extension 62 having a guide slot 63 to re-.

ceive a pin 64 extending from the bracket 52.

In operation the driving rollers 10 and 1 1 propel the wire 12 into a groove in the die 17 and after a predetermined number of coils have beenwound the cam member 58 permlts the spring 61 to act causing the lifter mechanism to move the die in the direction of the arrow Y, thus causing the coiled sections to move away from thepath of movement of the straight wire which continues to move into the die to produce another coiled section. It has been found that coiled sections separated by uncoiled sections or substantially straight portions, can be produced by a sudden displacement of the coil winding die and if this displacement occurs as in accordance with the present invention at pre determined intervals, a series of coiled sections will be produced separated by substantially straight portions. It is who understood that the number of coils in a section maybe varied and that the cam 58 may be changedor that the movement or stroke of isto be'understood that modifications may be made therein without departing from the spirit and scope of theappended claims.

Whatis claimed is:

' 1. A coil Windingv machine comprising means formoving a wire, mandrelless coil winding means and means for intermittently terminating the coiling operation to'produce uncoiled portions ofwire connectingcoiled portions;

2. A. coil winding machine comprising meansfor moving a wire, a coil winding .die

and means for intermittently causing a change in the relative positions of said means and die to. produce uncoiled portions of wire connecting coiled portions.

30A machine of the class given path,a wire coiling die in the path of movement of said wire tov produce a coiled section and means for causing a movement of said die to interrupt the coiling operation.

given path, a wire coiling die disposed to receive and coil said wire and means for changing the relative positions of said first coiled sections separated by uncoiled portions of wire.

5. A machine of the class described comprising means for driving a Wire through a given path, wire coiling means and means for causing a movement of said wire coiling means away from said wire driving means, means forterminating the movement of said wire, and means for moving said wire coiling means toward said wire driving means.

described comprising means for movmg a wire through a g '4. A- machine ofthe class described comprising. means for moving a wire through a In testimony whereof, I have hereunto subscribed my name this 25th day of'July, 1928.

i srnn wAns'rEN. i

n5 mentioned means and said die to produce

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