US2276579A

US2276579A - Spring coiling machine

Info

Publication number: US2276579A
Application number: US354028A
Authority: US
Inventors: Elmer W Halvorsen; Charles R Bergevin
Original assignee: Torrington Manufacturing Co
Current assignee: Madison Management Group Inc
Priority date: 1940-08-24
Filing date: 1940-08-24
Publication date: 1942-03-17
Anticipated expiration: 1959-03-17

Description

March 17, 1942. E. w. HALVQRSEN ETAL" 2,

' SPRING 001mm MACHINE' .Filed Aug. 424, 1940 3 Sheets-sheet 1 March 1942- E. w. HALVORSEN ETAL 7 SPRING COILING' MACHINE Filed Aug. 24, 1940 s Sheets-Sheet 2 E ma/1M Z/a lrorsq'iz Lkarles JEDer ewra Ma r ch 17, 1942. E W, HALVORSEN ETAL 2,276,579

SPRING COILING MACHINE Filed Au 24, 1940 s Sheets-Sheet z Patented Mar. 17,3942

s'ra'ras PATENT bit-ricsrnmo comma momma Elmer W. Halvorscn Charles Ra Bergevin,

Torrington, Comm, assignors to The Torrington Manufacturing Company,

Torrington,

Conm, a corporation of Connecticut ap u'eeaen August 24, 1940, Serial No. 354,028

(Cl. 1-40'i8) I 14 Claims.

The present invention relates to spring coiling machines of the type adapted to intermittently feed predetermined lengths of wire for coiling into springs of different forms, completed springs being severed in the intervals between successive operations of the feeding devices.

Spring coiling machines of this character are known as universal coilers, by reason of their The object of the present invention is to provide an improved mechanism in the form of conveniently installed attachments, whereby a machine of the type disclosed in the above-noted patent can be rendered capable of producing not only tension or compression springs of various forms, but also what are known in the trade as torsion springs. Torsion springs are characterized by the provision of uncoiled ends extending at an angle to the spring axis for attachment of the spring as desired, and the present invention contemplates automatic control of the coiling tools of the machine, whereby extended ends of predetermined length may be formed on springs having any desired number of convolutions, with out interrupting the feeding of the wire.

The above and'other advantageous features of the invention will hereinafter more fully appear from the following description, considered in connection with the accompanying drawings, in which Fig. 1 is a view in front elevation of a wire coiling machine embodying the invention.

Fig. 2 is a view in side elevation of the machine of Fig. l, as viewed from the left.

Fig. 3 is a view of the coiling tools. on an enlarged scale.

Fig. 4 is a sectional view along the line 8-0 of Fig. 3.

Fig. 5 is a fragmentary sectional view along the line 5-5 of Fig. 3.

Figs. 6 to 10 inclusive are diagrammatic views, a

In the drawings, the mechanism embodying the present invention is shown, for purposes of illustration, as being incorporated in a universal spring coiling machine, having the general capabilities of the machine disclosed in the aforementioned Patent No. 2,119,002, although it will be readily understood that the mechanisms for controlling the coiling tools to obtain the formation of torsion springs can be as well embodied in other spring coiling machines, such as so-called clutch-type coilers.

Referring to Figs. 1 and 2, the machine consists of spaced upright frame members I and 2 mount-' ed on, a suitable base 3, with the various wire feeding and coiling tools mounted on the front frame member I. and the several mechanisms.

for driving these tools located between the mem hers I and 2. The line of feed for the wire 4 is -indicated by the arrow in Fig. 1, the wire being fed through a preliminary guide 5 and cooperating pairs of feed rolls 6, 6 and I, I, which rolls project the wire for operation upon by the coiling tool, as hereinafter described. Wire guides 8 are provided between the feed rolls 6 and I, as well as between the feed rolls and coiling tools, and both the rolls and guides are provided with grooves of different sizes, so that a considerable range of wire diameters. may be handled by the machine.

The feed rolls 0, I are mounted on shafts 9 in the frames 1 and 2, the shafts being geared together for synchronous rotation as indicated in Fig. 2. The machine is driven from any suitable source of power, such asa motor l0, connected by a belt H to a pulley i2, with the pulley i2 adapted to be connected to a shaft 83 by means of a suitable clutch mechanism Id. The shaft 83 extends into a housing I! containing change speed gearing of any type, through which rotation of the shaft 13 is converted into rotation of a drive shaft it, see Fig. 1.

The drive shaft It carries a pinion ii in mesh with a gear i 8 mounted on a shaft l9, and rota-- tion of the gear 18 is adapted to be converted into intermittent rotation of the feed roll shafts 0 by means of a crank connection for imparting an oscillatory movement to a segment 20. Teeth formed on the outer circumference of the segment 20 engage a pinion 2| loosely mounted on a shaft 22 parallelto the feed roll shafts 9, and rotation of the pinion 21 is impartedto the shaft 22 only in one direction of rotation, through a suitable ratcheting device 22, all as more fully set forth and described in the aforesaid Patent No. 2,119,002. I The shaft 22 extends through the cated in Fig. 7.

frame 2 and carries a gear 24 in mesh with a gear 25 carried by the lower feed roll shafts 9, see Fig. 2, with other gears, not shown, connecting the lower feed roll shaftsto the upper feed roll shafts. With all four feed roll shafts 9 thus driven in synchronism from the shaft 22, it follows that each complete oscillation of the segment is adapted to turn the feed rolls 6 and I through a predetermined number of revolutions, or partial revolutions, to feed a certain amount of wire for coiling, as determined by the setting of the adjustable crank connection between the gear l8 and segment 26 and the setting of the speed change gearing in the housing l5.

I'he gear I 8 carries a gear 26 of smaller diameter, which is in mesh with a gear 21 mounted on a cam shaft 28 extending between the frames I and 2, as shown in Fig. 2. The cam shaft 28 is thus driven continuously for operating the coiling tools, the cam shaft making one complete revolution during one complete oscillation of the segment 20. Since rotation of the pinion 2| is imparted to the shaft 22 in only one direction of movement, rolls 6 and I operate to feed the wire 4 during only substantially one-half of one complete revolution of the cam shaft 28, which is adapted to simultaneously control operation of the coiling tools in a manner next to be described.

As the wire 4 is gripped between the feed rolls 6 and I and is fed forward, it passes over or under an arbor 29, in accordance with the adjustment of the coiling tools to produce either a right or a left-hand spring. The arbor 29 is carried by a slide 36 movable laterally within a guide way 3| provided by a tool holder 32, for a purpose which will later appear. In the formation of a torsion spring with extended ends, as contemplated by the present invention, the wire 4 is fed past the arbor 29 and under or over a coiling abutment 33, in accordance with whether a right or left-hand spring is to be coiled. When a predetermined length of wire has thus been fed past the arbor 29, the coiling abutment is swung about a pivot 34 so as to deflect the previously fed end downwardly around the arbor, as indi- Continued rotation of the feed rolls 6 and with the coiling abutment 33 opposite the arbor 29, causes the coiling abutment to deflect the wire into a coil around the arbor and coiling continues until the desired length of coiled spring has been formed, as indicated in Fig. 8. The coiling abutment 33 is then swung upwadly back to its original position out of the line of wire feed, whereupon continued rotation of the feed rolls causes the entire spring with one extended end. to be projected laterally past the coiling abutment 33 until the desired length of wire has been fed to provide for the other extended spring end, as shown in Fig. 9.

After shifting of the coiled spring, the feed rolls stop, with the parts occupying the position of Fig. 10. Upward movement is then imparted to the arbor slide 36 within the guideway 3|,

entering into the formation of a torsion spring in accordance with the present invention, there will next be described in the order named (a) the coiling abutment control, to cause both straight feeding and coiling of the wire, (b) the coiling arbor control to provide for coiling and cutting of the wire, (0) the diameterand pitch controls for determining the form of the springs being coiled, and (d) operation of the coiling tools to produce torsion springs with straight ends.

Coiling abutment control The coiling abutment 33 is carried by a holder 36 turnable on the pivot 34 that is mounted on a slide 31 forming part of the diameter control mechanism later described. As best shown in Fig. 3, the holder 36 is connected by a link 38 to a stud, 39 extending between the spaced arms 40 of a slide 4|, vertically movable between guides 42 mounted on the front of the frame I. The slide 4| provides a slot 43 through which passes a portion of the cam shaft 28 that extends through the frame I, and the shaft 28 has keyed thereto a hub 44, on which is mounted a pair of cams 45 and 46-. These

cams

45 and 46 are turnable on the hub 44 for purposes of adjustment, and are adapted to be clamped in position on the hub by means of a pressure ring 41 and a clamping plate 48 secured to the end face of the hub 44 by bolts 49.

The slide 4| carries a cam roll plate 50 which provides pairs of spaced lugs 5| and 52 on opposite sides of the cam shaft 28, anda cam roll 53 is adapted to be mounted on a stud 54 between either pair of lugs by means of a cap 55 and bolts 56 received in the lugs. The roll 53 can therefore be mounted on the plate 50 either above or below the cam shaft 28 for cooperation with the

cams

45 and 46, in accordance with whether a right or left-hand spring is being coiled. As shown in Figs. 3 and 4, the roll 53 is mounted below the

cams

45 and 46, so as to impart downward movement to the slide 4| as the roll 53 is engaged by the high points of the cams, this setting being for coiling a right-hand spring.

The roll 53 is yieldably maintained in engagement with the surfaces of the

cams

45 and 46 by means of springs 51 on opposite sides of the-slide 4|. One end of each spring is connected to a pin 58 projecting from a lug 59 provided at the lower end of the slide 4|, while its other end is connected to a fixed pin 60 carried by a guide 42. Therefore, the slide 4| is urged upwardly by the pull of the springs 51, to hold the roll 53 in engagement with the cams, so that turning movement of the coiling abutment holder 35 about its pivot 34 is entirely under the control of the

cams

45 and 46, through connection of the upper end 0f the slide 4| to the holderSE by the link 38.

With the parts occupying the position of Fig. 3. the slide 4| is at its extreme upper position, with the coiling abutment 33 positioned at an angle from the horizontal, so that its end is above the line of wire feed over the arbor 29. One complete revolution of the cam shaft 29 from the position shown, is adapted to first swing the coiling abutment 33 downwardly, so as to be opposite the arbor 29, as the high points of the

cams

45 and 46 engage the roll 53, after which continued rotation of the shaft 28 to complete one revolution, serves to swing the coiling abutment 33 back to its original position above the arbor 29, as the roll 53 engages the low points of the cams. While the overlapping

cams

45 and 46 function as a single element in one complete revolution of the cam shaft 28, each cam'is adjustable on the hub 44, independently of the other cam, so that the beginning and end of the downward movement of the coiling abutment 33 can be independently controlled for the purpose of varying the lengths of the straight ends of the springs that are coiled,

as will later appear. I

In setting up the coiling abutment control mechanism, adjustmentof the extreme positions of the coiling abutment 33 is obtained by relative movement between the cam roll plate 59 and the operating slide 4|. To this end, 'the plate 50 provides a lug 6| extending parallel to the lug 59 provided at the lower end of the slide ll, with a stud 62 carried by the lug 6| extending'freely through an opening 59a in the lug 59. A nut 63 threaded on the stud 62, provides means for drawing the plate lug 6| towards the slide lug 59, while a screw 64 threaded through the ing 59, provides means for moving the lugs apart. After making an adjustment of the cam roll plate 50 with respect to the slide 4|, by either the stud 62 or the screw 64, the parts are clamped together in adjusted position, by means of bolts 65 extending through slots 66 provided in the plate and threaded into the slide.

Coiling arbor control As previously pointed out, the arbor 29' is carried by a slide 30, movable freely up and down within a guideway 3| provided in a tool holder 32 mounted in the frame member I, as indicated at the broken away portion in Fig. 2. The lower end of the slide 30 rests on a rounded surface provided at the end of an actuator 61, receivedv 7 heads 69 are mounted on shafts l0, rotatably supported in parallel relation between the frames l and 2. The upper shaft carries a collar H, from which extends an arm I2 pivotally connected to a link I3, extending downwardly and connected at its lower end to an operating arm 14 under the control of a cam 15 on the shaft 28, all as more fully shown and described in the aforesaid Patent No. 2,119,002. Turning movement of the upper cutter shaft "I0 is imparted to the .lower shaft by means of arms I6 mounted on the shafts and connected by. a link l'l, so that the cutter heads 69 are adapted for synchronous turning movement, although in opposite directions, with respect to the coiling arbor 29.

The cam 15 controlling the movement of the cutter heads 69, is so designed that the heads are operated substantially in the 'middle of the dwell between successive operations of the feed rolls 6 and I, i. e., when the segment is making its return swing, with the ratcheting device 23 non-effective. Therefore, once during each revolution of the cam shaft 28, the lower head 69 will impart upward movement to the arbor slide 30 through the actuator 61, to thereby cause the upper edge of the arbor 29' to sever the wire as the arbor moves past the end face of the guide 35, which is carried by the tool holder 32 between the pair of guides 8 and the coiling abutment 33.

In order to maintain the position of the arbor. 23 and its slide 30 during the coiling operation, a stop 18 is provided in the form of a stud threaded into a bracket 19 mounted on the front by insure that the arbor 29 always returns to the. proper coiling position with reference to the guide 35, after a spring severing operation.

Diameter and pitch control I The slide 31 which pivotally supports the coiling abutment holder 36, is movable horizontally between guides 8!, so as to vary the distance be-- tween the end of the coiling abutment 33 and the arbor 29, when these tools are in coiling position. Back and forth movement is imparted to the slide 31 by means of an arm 82 connected to the slide 31 by a link 82a. The arm 82 is turnable with a shaft 83 extending through the frame i, and provided at its inner end with an operating arm 84, shown in dotted lines. As best shown in Fig. 2, and as fully set forth in the aforesaid Patent No. 2,119,002, the arm 84 is connected by a link 85,150 a lever 66, the turning movement of which is under the control of a cam 81 mountedon'the shaft 28. With the parts arranged as shown, each complete revolution of the cam 81 causes the coiling abutment and slide 31 to move backand forth with refersible to produce springs of varying contour, such as cone springs, barrel springs, or two-diameter springs, and by means of a hand wheel 88, it is possible to adjust the effective length of the link 85, to obtain close adjustment of the coiling point. Should it be desired to form a straight spring of uniform diameter, the wheel 88 is turned until the link 85 is of such length as to dispose the arm 86 out of contact with the cam 81. As a spring is formed of constant or variable diameter under the control of the coiling abutment 33, as described above, the pitch ofits convolutions is determined bya pitch tool 89, mounted on the tool holder 32. below the guide 35. This tool 89 bears on the wire after it leaves link 9| is connected to one arm of a bell crank lever 92, pivotally mounted at 93. The other arm of the lever 92 is connected by an adjustable link 94 tov a lever 95, pivotal movement of which is under the control of a cam 96 on the shaft 28. The form of the cam 96 thus determines the pitch of a spring being coiled, and close adjustments of the pitch tool 89 are obtainable by means of a hand wheel 91 for varying the effective length of the link 94, all as more fully set forth and described in the aforesaid Patent No. 2,119,002.

It is apparent then that the arbor 29 and coiling abutment 33 cooperate with the diameter and pitch control mechanisms of an existing machine, to produce springs of the desired form,

and the manner in which these tools are adapted to coil torsion springs with straight ends of predetermined length, in accordance with the present invention, will next be described.

Operation of coiling tools Assuming that the parts occupy the position of Fig. 3, which is'just after a completed spring has been severed from the wire, it is evident that the coiling abutment 33 will remain in the raised position shown for at least one quarter of a revolution of the cam shaft 28 However, before the roll 53 on the coiling abutment operating slide 4| leaves the low portions of the

cams

45 and 43, the feed rolls 5 and I start to rotate as the the diagram of Fig. 11, which shows the epsegment 29 swings from the position of Fig. 1

to drive the rolls 6 and 1 through the ratcheting device 23. Therefore, the first part of the wire feed is straight over the arbor 29 and beneath the raised coiling abutment 33, until the advancing end of the wire' strikes the' inclined surface of the deflector 33a at the rear of the coiling abutment, as shown in Fig. 6.

After a predetermined length of wire has been fed straight, as determined by the setting of the front end cam 45, movement of the roll 53 as it rides on the high point of the cam, imparts downward movement of the slide 4!. 'This causes the coiling abutment 33 to swing downwardly about its pivot 34, into the position of Fig. '7, thereby bending the previously fed straight length of wire downwardly around the arbor 29. ,This

downward swing of the coiling abutment occurs.

very rapidly, due to the steep rise of the cam 45, so that the continuously moving wire, as fed by th rolls, has already started to coil around the arbor 29 under the pressure of the coiling abutment 33, by the time the straight end has been bent downwardly.

The coiling of the wire into a spring will continue, as shown in Fig. 8, while the coiling abutment 33 remains in a substantially horizontal position, during which time the roll 53 continues to ride on the high points of both

cams

45 and 49, which are concentric. However, before the segment 29 reaches the end of its feeding stroke, the roll 53 rides off of the high point of the rear end cam 46, thereby permitting the springs 51 to move the coiling abutment actuating slide 4| upwardly. Such movement swings the coiling abutment 33 back to its starting position,

whereupon the wir again feeds past the arbor 29, to shift the previously coiled body portion of the spring beneath the raised coiling abutment,

as shown in Fig. 9. The amount of wire that is fed straight depends upon the setting of the rear end cam 46 with relation to the wire feeding stroke of the segment 29.

After the coil has been shifted to the position of Fig. 9, the wire feed ceases, and all coiling tools remain at rest until the cutter cam 15 on the shaft 28 causes the cutter head 69 carrying the actuator 61 to move toward the tool holder 32. When this occurs, the slide 39 is moved upwardly to carry the arbor 29 past the end of the guid 35, thereby severing the wire to deliver a completed spring with straight ends, as shown in Fig. 10. The head 59 then turns back to its original position, followed by the slide 39 under the pull of the spring 89, thereby returning the arbor 29 to its coiling position, as the head 59 engages the stop 19.

The cutter cam I5 is so timed that the cutting of the wire occurs substantially midway in the return stroke of the segment 29, as indicated in proximate sequence of operations during one revolution of the cam shaft. Therefore, following the severance of a completed spring, there is ample time for the arbor 29 to return to its coiling position, before the rolls 6 and I start to feed the wire again, with the coiling abutment 33 still in its raised position. Such straight feeding initiates another cycle of operations, identical'with the operations described above, so that a torsion spring with straight ends of predetermined length will be produced for each complete revolution of the cam shaft, starting from the position shown in Fig. 3.

As previously pointed out, the

cams

45 and 45 are individually adjustable on the hub 44, after loosening the clamping plate 48 by easing up on the bolts 49. By such adjustment, the length of each straight spring end can be accurately controlled, it being evident the greater the length of the high part of the cams, the shorter will be the lengths of the spring ends under the control thereof. On th other hand, turning the cams in opposite directions to shorten the overall length of the high parts, as the cams overlap more, will increase the lengths of the spring ends. Obviously. one cam can be moved to shorten one spring end, while the other cam is moved to lengthen the other, so as to produce springs having straight ends of different lengths.

While the spring shown in Fig. 8 is indicated as being of uniform diameter, obviously control of the position of the coiling abutment carrying slide 31 under the control of the cam 81,,permits springs to be coiled of varying diameters, due to back and forth movement of the coiling abutment 33 while maintained in its coiling position. Similarly, variations of pitch can be obtained from the tool 99 underthe control of the cam 96, it being evident that the diameter and pitch control mechanisms will function in their usual manner, independently of the mechanism for producing torsion springs with straight ends.

While the parts are shown in Fig. 3 as being in position for the coiling of a right-hand spring,

left-hand springs can be coiled upon making a few simple adjustments in the mechanism. In order to control the coiling abutment 33 when forming left-hand springs, it is onlynecessary to shift the roll 53 and its holding cap 55 to the upper pair of lugs 52, and to connect the springs 51 to pins 58a provided at the upper end of the slide 4|. The springs 51 will then tend to pull the slide downwardly, so that the coiling tool will be swung below the arbor 29 when the roll 53 is on the low part of the

cams

45 and 46.

.In order to set the arbor 29 for the coiling of above the tool holder 32, so as to exert an upward pull on the slide 39 tending to hold it in yielding engagement with the actuator 51.

From the foregoing, it is apparent that by the present invention there is provided animproved mechanism which can be conveniently installed on an existing universal coiler, to render the machine capable of producing torsion springs with straight ends of predetermined lengths, without interrupting feeding of the wire. In this important respect th mechanism of the present invention differs from .the mechanism shown in our Patent No. 2,170,984, issued August 29,

the wire feed is in three separate with feed rolls capable of intermittent rotative movement. a coiling arbor and a coiling abutment capable of relative movement with respect to the coiling axis, of means for controlling the relative positions of said arbor and abutment to formwire as fed continuously by said rolls into a coiled spring with extended ends, and means to shift said arbor while said rolls are stationary, to cause severance of a completed spring.

2. In a spring coiling machine, the combination with rotary feed rolls, a coiling arbor, a coiling abutment tumable on an axis parallel to the axis of said arbor, and means for rotating said rolls to cause feeding of a length of wire past said arbor and abutment, of means for turning said abutment .on its axis. while said rolls are rotating to bend the previously fed straight length of wire around said arbor, and to cause the deflection of the wire being fed against said abutment and around said arbor into a coil.

3. In a spring coiling machine, the combination with rotary feed rolls, a coiling arbor, a coiling abutment tumable on an axis parallel to the axis of said arbor, and means for rotating said rolls to cause feeding of a length of wire past said arbor and abutment, of means for turning said abutment on its axis while said rolls are rotating. to bend the previously fed length of wire,

while deflecting the wire being fed against said abutment into a coil around said arbor, and means for turning said abutment back to its original position while said rolls continue to rotate, to cause the feeding of a second length of wire continuous with one end of said coil.

4. In a spring coiling machine, the combina-'- tion with rotary feed rolls, a coiling arbor, a coiling abutment tumable on an axis parallel to the axis of said arbor, and means for rotating said rolls to cause feeding of a length of wire past said arbor and abutment, of means for turning said abutment on its axis while said rolls are rotating to first cause deflection of said wire against said abutment and around said arbor into a coil, followed by the feeding of a second length of wire past said arbor and abutment, and means for moving said arbor, while said rolls are stationary, to cause the severance of a coiled spring with straight ends. 5. In a spring coiling machine, .the combination with rolls capable of intermittent rotative movement to feed wire, a coiling arbor movable with respect to the coiling axis, a guide interposed between said arbor and rolls, and an abutment adapted to deflect wire fed by said rolls into a coil around said arbor, of means for moving said arbor with respect to said guide while said rolls are stationary, to sever the coil of wire by cooperation between said 'arbor and guide.

6. In a spring coiling machine, the combination with rolls capable of intermittent rotative movement to feed wire, a coiling arbor, a guide interposed between said arbor and rolls, and an abutment adapted to deflect wire'fed by said rolls into a coil around said arbor, of means for controlling the position of said abutment while said rolls are rotating to either deflect wire fed by said rolls into a coil around said abutment, or

to permit its'unobstructed passage beyond said arbor, and means for moving said arbor with respect to said guide, whilesaid rolls are stationary, to cause the severance of wire-previously.

coiled and fed past the arbor.

7. In a spring coiling machine, the combination with feed rolls capable of intermittent rotative movement, a coiling arborand a coiling abutment, of means for controlling the relative positions of said abutment and arbor during rotative movement of said rolls to continuously cause the feeding of a predetermined length of wire past said arbor and said abutment, the flexure of said wire against said abutment into a coil of predetermined length, and finally, the feeding of a.

8. In a spring coiling machine, the combination with feed rolls capable of intermittent rotative- I movement,-a coiling arbor and a'coiling abutment, of means for controlling the relative posij tions of said abutment and arbor during rotative movement of said rolls to continuously cause the feeding of a predetermined length of wire past said arbor and said abutment, the flexure of said wire against said abutment into a coil of predetermined length, and finally, the feeding of a second predetermined length of wire past said arbor and abutment continuous with one end of said coil, and means for severing said coil from the wire stock in an interval between successive rotative movements of said rolls.

9. In a spring coiling machine, the combination with rolls capable of intermittent rotative movement for feeding wire, a-e0iling arbor and a coiling abutment, capable of relative movement with respect to the coiling axis of said arbor, of means for controlling the relative positions of said arbor and abutment during uninterrupted rotative movement of said rolls, to form wire as fed continuously bysaid rolls into .a spring wit adjacent coiled and uncoiled portions.

10. In a spring coiling machine, the combination with rolls capable of intermittent rotative movement for feeding wire, a coiling arbor and a coiling abutment, capable of relative movement with respect to the coiling axis of said arbor, of means for controlling the relative positions of said arbor and abutment during uninterrupted rotative movement of said rolls, to form wire as fed continuously by said rolls into a spring with a coiled portion having convolutions of variable diameter, and an adjacent uncoiled portion of predetermined length.

ll. In a spring coiling machine, the combination with rolls capable of intermittent rotative movement-for feeding wire, a coiling arbor and a coiling abutment, capable of relative movement with respect to the coiling axis of said arbor, of means for controlling the relative positions of said arbor and abutment during uninterrupted rotative movement of said rolls, to form wire as fed continuously by said rolls into 'a spring with a coiled portion of variable pitch and an adjacent uncoiled portion of predetermined length.

12. In a spring coiling machine, the combination with rolls capable of intermittent rotative movement for feeding wire, a coiling arbor and a coiling abutment, capable of relative movement with respect to the coiling axis of said arbor, of

means for controlling the relative positions of fed continuously by said rolls, into a. spring with a coiled portion "having convolutions of variable diameter and pitch, and an adjacent uncoiled portion of predetermined length.

13. In a spring coiling machine, the combination with rolls capable of intermittent rotative movement for feeding wire, a coiling arbor and "a coiling abutment, capable of relative movement with respect to the coiling axis of said arbor, 01' means for controlling the relative positions of said arbor and abutment during uninterrupted rotative movement of said rolls, to form wire as fed continuously by said rolls into a spring with adjacent coiled and uncoiledl portions, and

means for shifting said arbor with respect to the 16 coiling axis, to sever said spring from the wire stock while said rolls are stationary.

14. In a spring coiling machine, the combination with feed rolls capable of intermittent rotative movement, a coiling arbor and a coiling abutment, capable of relative movement with respect to the coiling axis of said arbor, and means for controlling the relative positions of said arbor and abutment to form wire as fed by' said rolls into a continuous spring with adjacent coiled and unooiled portions, of means for shifting' said arbor bodily while said rolls are stationary, to cause the severance of a completed spring.

- mm W. HALVORSEN.

CHARLES R. BERGEVIN.