US2341347A - C clip forming machine - Google Patents

Description

Feb. 8, 1944. v A W B'ER HAL 4 2,341,347

"C" CLIP FORMING MACHINE Filed March 7, 1942 8 Sheets-Sheet 1 INVENTORS.

J n fi. W e7; BY Howard 144 14 62 zins.

V I vvM. A TTORNEY3.

Feb. 8, 1944. J. A. WEBER EIAL 8 Sheets-Sheet 2 INVENTORS, )1 I?- We Z2]: er award/I. 1442281116.

9' .xw-e TTORNEYS Feb. 8, 1944.

Filegl March 7, 1942 J. A; WEBER TAL 2,341,347

CLIP FORMING MACHINE 8 Sheets-Sheet 3 IN VENTORs.

9" A TTORZYVE 1 Feb. 8, 1544.

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"C" CLIP FORMING MACHINE A T TORNE 2S.

Feb. 8, 1944. A WEBER ET AL 2,341,347

"c" CLIP FORMING MACHINE Filed Marcfi 7, 1942 8 Sheets-Sheet 6 I Z l-l5 o 3- 2 X4 [N VENTOR T ORNE Y Feb. 8, 1944.

J. A. WEBER EI'AL "C" CLIP FORMING MACHINE Filed March 7, 1942 8 Sheets-Sheet 7 INVENTORJ. J 5 r! Weiezy i l E. BY #0 Ward 144 h z'ziz'ns: M, 9'

A TTOR EYa Feb. 8, 1944. J. A. WEBER EI'AL 2,341,347 v "c" C'LIP- FORMING MACHINE:

Filed March 7, '1942 8 Sheets-Sheet 8 'III III! 1, W

1?. 1449.5 elf.

E E: y #0164/4 144 Ma Zie'ns E 2 2:56am.

IN VEN T0196.-

Patented Feb. 8, 1944 C CLIP FORMING MACHINE John A. Weber, Detroit, and Howard Wilkins,

Warren, Mich., assignors to The Murray Corporation of America, Detroit, Mich., a corporation of Delaware Application March 7, 1942,.seria1 No. 433,726

9 Claims. (01. 140-3) Our invention relates to ring forming and clinching mechanism, and particularly to a device for cutting and forming rings from a strip of fiat stock and clinching the formed ring about a pair of members to be secured together.

Seat frames, particularly those for automotive use are usually made of border wire secured to each other, to braces and to the springs, by rings which are clinched thereover. The rings may be made of wire or may be formed from flat sheet stock. The rings were usually formed prior to clinching and hand tools were utilized for holding one of the rings and operated to clinch the ring over a pair of the frame elements.

The present invention pertains to a device for cutting and. forming a strip of metal into open rings and advancing the rings seriatim to a pair of jaws which are operated in synchronism with the cutting and forming mechanism. The formed ring is retained by the jaws and delivered over the pair of elements to be secured together after which the jaws are operated to clamp th rings thereabout. Each time the operator places the elements to be secured together in a position to be engaged by the jaws, a lever is tripped to have the jaws move together to clamp the ring over the elements. During this operation the strip of material is operated upon in the shearing and forming dies and after the jaws are lowered the endmost formed ring is disposed thereinto, severed from the strip and moved upward with the jaws in position to be clinched over the elements to be secured together.

Accordingly, the main objects of my invention are; to provide a device for advancing, shearing, and forming a strip of metal into open rings each time a ring is clinched about a pair of elements; to provide a device for progressively shearing a strip of material and forming open rings from the connected sheared sections which progressively advance to the clinching jaws which sever a ring from the strip as the jaws move into position to engage the elements to be secured together; to provide a device for forming and advancing rings from a strip of material which is driven by a motor and controlled by a clutch which, upon being released, clinches a ring about elements to be secured together and advances the strip to deliver a new ring to the clinching jaws and move the strip into position to be'operated on by the next adjacent set of dies; and in general, to provide a device for forming and clinching rings about elements to be secured together, which is simple in construction, positive in operation, and economical of manufacture.

Other objects and features of novelty of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawings, wherein:

Figure 1 is a broken perspective view of a table having a' device embodying features of my invention supported thereby;

Figure-2 is an enlarged perspective view of the table and machine illustrated in Fig. 1, with parts broken away;

Figure 3 is a view of a pair of border wires which have been secured together by the device illustrated in Fig. 2;

Fig. 4 is an enlarged view, in elevation, of the device illustrated in Fig. 2;

Fig. 5 is a view in elevation of a holder for the roll of material to be fed into the device;

Fig. 6 is a sectional view of the structure illustrated in Fig. 5, taken on the line 6-6 thereof;

Fig. '7 is an enlarged sectional view of the struc ture illustrated in Fig. 5, taken on the line 'l-l thereof;

Fig. 8 is an enlarged end view of the structure illustrated in Fig. 4, as viewed from the point 8 thereof;

Fig. 9 is an enlarged sectional view of the structure illustrated in Fig. 8, taken on the line 9-9 thereof, with the strip of material in clamped position;

Fig. 10 is a view of the clamping rolls illustrated in Fig. 9 with the strip of material in released position;

Fig. 11 is an enlarged sectional view of the structure illustrated in Fig. 4, taken on the line I ll I thereof;

Fig. 12 is an enlarged sectional view of the structure illustrated in Fig. 4, taken on the line l2 --l 2 thereof Fig. 13- is an enlarged sectional view of the structure illustrated in Fig. 11, taken on the line 13-13 thereof;

Fig. 14 is an enlarged perspective view of the strip of material showing the operations performed thereon by the shearing and forming dies of the device;

Fig. 15 is a sectional view of the structure illustrated in Fig. 13, taken on the line l5-l 5 thereof;

Fig. 16 is an enlarged sectional view of the structure illustrated in Fig. 4, taken on the line 16-45 thereof Fig. 17 is an enlarged sectional view of the structure illustrated in Fig. 4, taken on the line ll--l1 thereof;

Fig. 18 is a sectional view of the structure illustrated in Fig. 17, taken on the line |8l 3 thereof;

Fig. 19 is a broken sectional View of the structure illustrated in Fig. 4, taken on the line l9-I 9 thereof; and

Fig. 20 is a sectional view of the structure illustrated in Fig. 17, taken on the line 2lI29 thereof.

The forming andclinching device embodies a mechanism 2| which is supported on a table 22 having an opening 23 therein through which the clinching jaws 24 project when in position to clinch a band 25 about a pair of border wires 25- 1 and 21, as illustrated in Fig. 3. The wires are of the conventional type employed at the edge of a seat cushion, with the wire having an offset portion 28 which engages the wire 21 and which is encompassed by the band 25 when clinched thereabout. Brackets 29 arespaced on the machine for supporting a plurality of the wires 25 and 2?.

The device 2! embodies a pulley 3|.havi'n'g a pair of V-groo'ves for the-reception of. a pair: of driving belts A motor 3|!- is employed for driving the pulley 3! continuously: in'rotation. A clutch mechanism33 is employed forconnecting and disconnecting the drive 'from thepulley SE to the mechanism of the device 2!. A gripping mechanism 34 for the strip of material 35pmgressively feeds the strip through the device. The'strip is progressively advanced to the-shearing and forming dies of the mechanism38. The endmost formed band on the stripis advanced to the jaws 2 4' of the clinching mechanism 3? when it is severed from the strip and clinched about the elements 26 and 21to'b'e secured together.

In Figs. 5. 6, and '7, we have illustrated'a supporting device 38-for theroll' 39 of the strip material 35. The roll is supported'cn apair of rollers 4'11 and 42 with another roller. 43".positioned'to prevent the rollof material from moving from the'rollers 4i and 42 when the strip35 is advanced in the device 2!. A plurality of pairs of brackets 44 support a pair of vertical rollers 45 foriguidin'g the roll of material 39 between side walls 45. The rollers 41, 42, and 43' are mounted on a pair of bearings 41 which may be lubricated through a supporting shaft 48.

The strip of material 35'is fed into a pair of knurled rollers 49 and of the gripping mechanism 34 mounted on shafts 52 and 58; respectively. The shaft 52 is mounted in a bracket .54 while the shaft 53 is mounted in brackets 55 which are slidably secured within the bracket 54 for vertical movement against the bias of a pair of springs 55. The tension in the spr-ing 58 is adjusted by a pair of studs secured in the bosses 5?. A bifurcated bracket 58 is pivotally mounted on the shaft 53, each bifurcated end being provided with a cam 59 by which the shaft 53 is moved from the shaft 52, as illustrated in Fig. 10. This permits the strip of material 35 to be in serted between rollers 49 and 53 where it is guided by the heads'of bolts 55 disposed on theinner faces of the bracket 54.

After the strip 35 has been inserted in the rolls. as illustrated in Fig. manipulation of the racket 58 releases the cams 59 from engagement with the faces 69 of the roller 49 which permits the springs 55 to move the brackets 55 upwardly to have the'rollers 49 and 5| securely engage the strip. A pair of pinion gears 68 are secured on the ends of the shafts 52 and 53 in mesh with each other to place the shafts 52 and 53 and the rollers 49 and 5| in driving relation with each other. A plurality of ratchet teeth 63 are provided on each end of the roller 49 in position to be engaged by fingers 64 which are mounted for vertical operation in a slot in the bracket 54. The fingers 64 are secured to a slide 65 by pins 68 on which the fingers 54 are tiltable. The slide 65 has a roller 61 secured on the end by a pin 68 which projects frontwardly thereof. The roller operates in a cam slot 69 in a cam pulley 1 I During rotation of the pulley H the slide 65 is moved downwardly and upwardly to move the lingers 94 out of engagement with one of the ratchetteeth 83. and pivoted forwardly about the I pivot 99 into a position to engage the next adjacent teeth on the roller 49. A spring-pressed ball 72 inthe body of the fingers 54 engages a sloping surface on pins 13 which urge the fingers 64 forwardly in position to engage the ratchet teeth. When the slide is moved upwardly, the fingers 84, being limited in forward movement by the stop 74, engage the next adjacent ratchet'tooth of the roller 49 and rotate the roller 49 an amount which advances the strip 35 an amount required to make one of the ring bands. Thus for each revolution of the shaft of the device the strip .35 is advanced an amount equal to that requiredto make one of the bands, and it is during the time of this operation that the jaws 24 are operated to clinch a band and to moveinto a position to receive a band which has been completed during the clinching operation.

The shearing and forming mechanism 38 embodies a housing 15 having a slot'18 through which the strip of material 35 is introduced. The strip is first advanced to a. set of shearing. dies 11 comprising a pair of spaced shearing blades 18' and a pair of spaced slots 19in the die blocks 8t and 82, respectively. Whenthe device is operated a pair ofspaced aligned slots 83 areshearedby, the blades 18 in the strip 35 as illustrated in Fig. 14.

A set of die blocks 84 and'85 are mounted adjacent to the die blocks 9|- and 82 for the purpose of bending up the corner 86 of the band; as illustrated in Fig. 11. A set of die blocks'8l and 88 are mounted adjacent to the die blocks 84 and 85 for the purpose of rolling up the flanges B9 and 9! on'the band which is the shape of the band when delivered'to the jaws 24 of the clinching device 31. The die elements 82, 85, and 88 are mounted in the upper'portion 92 of thehousing while the mating die portions 8|, 84, and 81 are mounted in a slide 93 disposed within the housing. The slide 93 is provided with a boss 94, as illustrated in Fig. 11, to which an arm 95 of an eccentric 95 is adjustablyconnected.

It will be noted from Fig. 14.that a pair. of aligned slots 83 are cutin the strip 35 at the same time that one of the bandportions has the end 85 bent upwardly thereon. The slotting of one portion and the bending of the end 86 on another portion occur at the same time thatan adjacent portion has the flanges 89 and 9| 'bent upwardly thereon. The strip 35 is continuously advanced to the die sets and progressively operated upon to completely formta band 99 as illustrated in Fig. 14. The-strip is continuously advanced until the endmost formed band 99 projects from the slot 89 at the opposite end'of the-housing from the slot 15 and is disposed within the jaws 24 of the clinchingdevice 31 when the jaws are retracted and aligned with the slot. Upon the upward movement of the clinching device 31, the web 18 between the slots 83 is sheared by the shearing edge 91 so that a severed band V9!] is supported within the jaws whenthe jaws projectfrom the top of the table 22, as illustrated inFig.1.

i The pair of jaws 24 are 'mounted on a pin 99 which extends from a vertically-moving slide 99 mounted on the face of the housing 15. The slide 99 is provided with a cam roller IOI which operates in a cam slot I02 in a cam pulley I03. The cam pulley I83 carries on the front" face thereof a pair of oppositely disposed cams I04 which engage rollers I05 on the ends of a pair of arms I06 which are pivoted on the jaws 24 by pins I01. Bosses I 08 are provided on each of the jaws through which eye bolts I09 project, the end of the bolt being secured by pins III to a projection II2 on the arms I06. Springs II3 are disposed over the eye-bolts between the projections 2 and the bosses I08, to provide resilient pressure for the ends of the jaws during a clinching operation. After the cams I04 have rotated substantially 70 degrees the rollers I05 are disengag'ed therefrom, thereby permitting the arms I06 to move inwardly and the jaws 24 to remain open for the remainder of the complete revolu tion of the cam pulley I03. After the jaws 24 have been moved inwardly and outwardly of each other by the cams I04 during the first 70 degree movement of the cam pulley I03, the cam track I02 operates on the roller IOI to move the slide 99 downwardly. This occurs in the arc of the track indicated by II 4. Thereafter the roller dwells in the arc portion II5 for substantially 90 degrees and it is during this dwell portion that the jaws 24 are aligned with the slot 80 to receive the formed band 90 on the end of the strip 35. The roller MI is operated in the track portion II6 to move the slide 99 upwardly back to the initial position as illustrated in Fig. 16. This projects the jaws 24 above the top of the table after shearing the endmost band 94 fro the strip on the shearing edge 91.

The clutch mechanism 33 comprises a plate I2I which is secured to the inner face of the pulley 3I by a plurality of screws I22. The plate has a plurality of projecting teeth I23 having sloping faces I24. The teeth of the plate I2I are presented toward a cylindrical clutch block I25 which is secured to the shaft I26 by a key I21. A plunger I28 is disposed parallel to the shaft I26 in an aperture I29 in the block, and is urged outwardly of the aperture by a spring I3I. The plunger I28 is provided with a projection I32 which operates in a slot I33 in the block. The projection I32 is provided with a sloping face I34 which is normally engaged by a sloping face I35 on a lever I36. The lever is pivoted at I31 on a bracket I38 which is supported or otherwise attached to a plate I39. The opposite end of the link from that containing the sloping face I35 is pivotally connected to a rod I4I, the opposite end of which is pivoted to a foot lever I42 contained within a housing I43 which is secured to the floor.

' A spring I44 encompasses the rod at the upper end thereof and provides a bias for tilting the pivoted end of the lever I35 upwardly to urge the opposite end of the lever against the block I25 in a position to engage the projection I32 of the plunger I20. The lower end of the spring is'abutted against a bifurcated plate I45 mounted on a cross brace I46 of the device. The lower end of the bracket I38 has a lever I41 secured thereto by a pivot I48 provided with a projecting arm I49 having a sloping face I5I. Adjacent to the pivot of the link a pair of notches I52 and I53 are provided in position to be engaged by a.

projection on a plunger I54 which is movable in an'aperture I55 in the bracket. A spring I55- urges the plunger out of the end of the aperture into a notch I52 or I53 and retains the lever I41 with the arm I49 disposed for engagement with the block I25 or away therefrom at the will of the operator.

When it is desired to clinch a band about the pair of wires the foot lever I 42 is moved downwardly tilting the lever I36 in a clockwise direction for releasing the projection I32 and permitting the plunger I28 to be urged outwardly by the spring I3I into engagement with a tooth I23. The block I25 is then free to rotate with the pulley 3I for one complete revolution within which time the link I36 moves back into engagement with the block I25 upon release of the lever I42l The projection I32 contacts the sloping face I35 of link I36 and withdraws the plunger I28 from engagement with the tooth I23 and interrupts the operation of the shaft I26.

' The complete revolution of the block occurs when the link I41 is moved downwardly from the block I23 so as to have the arm I49 out of position to engage the projection I32. When a half revolution of the shaft I28 is desired, themovement of the link I41 into the position illustrated in Fig. 17, places the arm in position to engage the projection I32 to move the plunger I28 out of engagement with a tooth I23. The link I 41 is only employed when the operator desires to interrupt the complete operating cycle of the device with the jaws 24 in position to receive a band 90.

The shaft I26, upon which the pulley 3| is rotatable, is supported on brackets I58 and I59 which extend from the web I60 from which the brackets I38 project. The web I 60 is attached to the supporting plate I39 which is secured to the housing 36 to form a unit construction. Projections from the housing form the pair of brackets IGI and I62 which also support the shaft 26. The pulley 3| rotates independently on the shaft I26 and drives the shaft when the plunger I28 is in engagement with a tooth I23 of the plate IN. The device is illustrated in Fig. 4 with the plunger I28 out of engagement with a tooth I23 and with the pulley 3| operating in rotation. The jaws 24 project above the table 22 in position to receive the elements 26 and 21 to be secured together. The cam plate 'II is in the posi-' tion illustrated in Figs. 8 and '9 with the roller 61 of the slide 65 in uppermost position. The cam plate I03 along with the cam elements I04 of the jaws 24 are in the position illustrated in Fig. 16. The eccentric element 96 for operating the dies 8I, 84 and 81, is in the position illustrated in Fig. 11. When the foot pedal I42 is operated and the plunger I28 moves in engagement with a tooth I23 the shaft I26 is rotated with the pulley 3I to first move the jaws into and out of engagement with each other to clinch the band about the elements 26 and 27. During this operation the eccentric 96 has moved up toward its maximum amount to have dies 8I, 84, and 81 perform the shearing and forming operations on the strip 35. The jaws are moved down in the next 45 degrees of shaft rotation and stay in this down position until the shaft has moved through 300 degrees. Between 90 and 240 degrees of movement of the shaft I26 the slide 65 moves down to move the ratchet fingers 64 into engagement with a ratchet tooth 63 of the roller 49 and the next 60 degree movement of the cam plate H moves the slide upwardly along with the raltchet fingers which rotate therolle-r 49 and therefore. the roller .5I anamount to advance the stripttthe length of the band .90 plus the amount of metal removed by the shearin die M. This advancement, moves the endmost link 90 as illustrated in Fig. 14 into the jaws 24 and thereafter the cam II dwells on the roller 61 and the jaws 24 are moved upwardly by the cam plate I03 to sever the web ID on the shearing edge 81 to release the band 50 from the strip. The eccentric 96Hcornpletes its 360 degree movement back to the position illustrated in Fig. 11. At this time theprojection I32 has moved up the sloping face I35 of the link I36 to move the plunger I28 out of engagement with a tooth I23 which thereby interrupts further rotation of the shaft I26 and completes the cycle of operation with a formed band disposed in the jaws 24 which again project through the aperture 23 of the table 22 in position to receive the next pair of border wires 26 and 21'.

When. the link I4! is moved into the position illustrated in Fig. 1'7 with the arm M9 in position to have the sloping surface IEI engage the projection I32, the plunger will be in position to interrupt the rotation of the shaft I26 at a half cycle of operation or 180 degree movement in rotation. In this position the advanced strip has been operated on by the die elements BI, 84 and 87 and the jaws have been lowered in position to receive th formed band at the end of the strip when the strip is again advanced, This permits. the operator to insert the end of a new strip 35 within the rolls 4B and SI, and removes the end of the prior roll which will then be unsupported within. the slot I95'of the housing 35. The end of the new strip progresses through the dies and advances to the jaws 24 in the next succeeding cycles of operation of the device. The loading of the machine has been simplified further by the use of the rollers 4| and 42 on which the roll of material is supported.

What is claimed is:

--1. In a device for forming and clinching bands about elements to be secured together, a shaft, cams on said shaft, a pulley rotatable on said shaft, a clutch for engaging said pulley for driving said shaft by said pulley for operating said cams, a clinching jaw, a set or dies for operating on a strip of material, means for advancing the strip of material to said dies and jaw, and means interconnecting said jaws, dies, and strip advancing means to said cams for severing a formed band from the strip operating the jaws to clinch a band and progressively form additional bands.

2. In a device for forming and clinching bands about elements to be secured together, a rotatable shaft, cams on said shaft, a pair of clinching jaws operated by one of said cams, a set of dies operated by another of said cams for forming a strip of material into connected U-shaped clips, means for advancing said strip of connected U-shaped clips to said dies and jaws operated by an additional cam on said shaft, and control means for rotating said shaft through 360 degrees for clinching a band, progressively forming additional bands and delivering a band to-the jaws which severs the band as the jaws are moved to clinching position.

3. A device for banding a pair of elements together including, in combination, a supporting table having an aperture therein, a device supported by said table and having a pair of jaws projectable through said aperture, means on said device for progressively forming C-shaped bands LII from a strip of material, means for retracting said jaws from said aperture in position to receive one of said bands after it is formed, and means for moving said jaws to sever the bandfrom the strip, to project the jaws from said aperture and for operating said jaws to clinch said formedband.

4. In a device for forming and clinching bands about elements to be secured together, a shaft, a plurality of cams on said shaft, a pair of jaws movable toward and away from each other by one cam and movable in reciprocation as a unit by another cam, a plurality of dies actuated by another of said cams which progressively operate on a strip of material, and strip advancing means actuated by another of said cams, said cams being so disposed as to first clinch a band about elements to be secured together, then advance the dies to shape bands on the strip :of material, next retract the jaws to a position .of alignment with the formed end of the strip -of material, next advance the strip to have the endmost formed band inserted in the jaws, and thereafter move the jaws upwardly to sever the band from the strip.

5. In a device for forming and clinching bands about elements to be secured together, a shaft, a plurality of cams on said shaft, a pair of jaws movable toward and away from each other by one cam and movable in reciprocation as a unit by another cam, a plurality of dies actuated by another of said cams which progressively operate on a strip of material, and strip advancing means actuated by another of said cams, said cams being so disposed as to first clinch a band about elements to be secured together, then advance the dies to shape bands on the strip of material, next retract the jaws to a position of alignment with the formed end of the strip of material, next advance the strip to have the endmost formed band inserted inthe jaws, thereafter move the jaws upwardly to sever the band from the strip, driving means for said shaft, clutch means for securing said driving means to said shaft, and means for disengaging said shaft from said driving means after a single revolution of said shaft.

6. In a device for forming and clinching bands about elements to be secured together, a shaft, a lurality of cams on said shaft, a pair of jaws movable toward and away from each other by one cam and movable in reciprocation as a unit by another cam, a plurality of dies actuated by another of said cams which progressively operate on a strip of material, and strip advancing means actuated by another of said cams, said cams being so disposed as to first clinch a band about elements to be secured together, then advance the dies to shape bands on the strip of material, next retract the jaws to a position of alignment with the formed end of the strip of material, next advance the strip to have the endmost formed band inserted in the jaws, thereafter move the jaws upwardly to sever the band from the strip, driving means for said shaft, clutch means for securing said driving means to said shaft, means for disengaging said shaft from said driving means after a single revolution of said shaft, and additional means for interrupting the rotation of saidshaft after rotating through substantially degrees.

7. In a device for forming and clinching bands about elements to be secured together, a shaft, means for supporting said shaft for rotation, a plurality of cams on said shaft, a pair of clinching jaws operable by one of said cams for moving the jaws together and by another of said cams for reciprocating the jaws to and from clinching position, a set of dies for shearing aligned slots in a strip of material, additional dies for forming flanges on the edges of said sheared portions, and means for connecting said die sets to a cam on said shaft, a pair of rollers, means connected to another of said cams for rotating said pair of rollers for advancing said strip through saiddies, means for rotating the shaft through 360 degrees to first operate the jaws for clinching a band about the element, for moving the dies for operation on said strip of material, for retracting the jaws into alignment with the strip, advancing the strip to deliver the endmost band to the jaws, and severing the band from the strip as the jaws are moved to their initial position.

8. In a device for forming and clinching bands about elements to be secured together, a shaft, means for supporting said shaft for rotation, a plurality of cams on said shaft, a pair of clinching jaws operable by one of said cams for moving the jaws together and by another of said cams for reciprocating the jaws to and from clinching position, a set of dies for shearing aligned slots in a strip of material, additional dies for forming flanges on the edges of said sheared portions, and means for connecting said die sets to a cam on said shaft, a pair of rollers, means connected to another of said cams for rotating said pair of rollers for advancing said strip through said dies, means for rotating the shaft through 360 degrees to first operate the jaws for clinching a band about the element, for moving the dies for Operation on said strip of material, for retracting the jaws into alignment with the strip, advancing the strip to deliver the endmost band to the jaws, and severing the band from the strip as the jaws are moved to their initial position, and means for separating said feed rolls to permit the insertion of a new strip of material therebetween.

9. In a device for forming and clinching bands about elements to be secured together, a shaft, means for supporting said shaft for rotation, a plurality of cams on said shaft, a pair of clinching jaws operable by one of said cams for moving the jaws together and by another of said cams for reciprocating the jaws to and from clinching position, a set of dies for shearing aligned slots in a strip of material, additional dies for forming flanges on the edges of said sheared portions, and means for connecting said die sets to a cam on said shaft, a pair of rollers, means connected to another of said cams for rotating said pair of rollers for advancing said strip through said dies, means for rotating the shaft through 360 degrees to first operate the jaws for clinching a band about the element, for moving the dies for operation on said strip of material, for retracting the jaws into alignment with the strip, advancing the strip to deliver the endmost band to the jaws, severing the band from the strip as the jaws are moved to their initial position, a pulley freely rotatable on said shaft, clutch means for engaging said pulley with the shaft, and means for releasing said clutch means at the end of a single rotation of the shaft.

JOHN A. WEBER. HOWARD W. WILKINS.

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