US2571078A

US2571078A - Apparatus for feeding, severing, stripping, and bending hooked wire leads

Info

Publication number: US2571078A
Application number: US42835A
Authority: US
Inventors: Vollmer John
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-08-06
Filing date: 1948-08-06
Publication date: 1951-10-09
Anticipated expiration: 1968-10-09

Description

2,571,078 AND APPARATUS FOR FEEDING, SEVERING, STRIPPING,

BENDING HOOKED WIRE LEADS 7 Sheets-Sheet 1 Filed Au A 5, 194a J. VOLLMER 2,571,078 APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND

' BENDING HOOKED WIRE LEADS 7 Sheets-Sheet 2 Oct. '9 1951 Filed Aug. 6, 194a 3nnentor fly4 1 A (Ittomegs Oct. 9, 1951 12,571,078

J. VOLLMER APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND

V BENDING HOOKED WIRE LEADS Filed Aug. 6, 1948 7 Sheets-Sheet 5 l I I Bnventor J. VOLLMER APPARATUS FOR FEEDING, 'SEVERING, STRIPPING,- BENDING HOOKED WIRE LEADS Oct. 9, 1951 Filed Aug. 6 .1948

7 Shee ts-Sheet 4 3nventor 8 7 0 1 7 2D N A m b I P. P. u s w w E L RE Em. MW um ow V Filed Aug. 6, 19 18 '7 Sheets-Sheet 5 Oct. 9, 1951 2,571,078

' J. VOLLMER APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND- BENDING HOOKED WIRE LEADS Filed Aug. 6, 1948 7 Sheets-Sheet 7 m6 I46 I 3nventot Patented Oct. 9, 1951 HE!) STATES PATENT ()FF-ICE APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND BENDING HOOKED WIRE LEADS 19 Claims.

This invention relates to a device for bendin anend of a wire lead for electrical devices, and more particularly to a device operating with and as a part of a machin which automatically cuts these leads to length and strips a certain amount of insulation from the opposite ends of the cut lengths in preparation for making the electrical connections of these leads in electrical devices, such, for example, as electricaldry shavers and other electrical devices.

It has for an object to provide a device which will operate automatically with the lead cutting and stripping device to bend one end of the stripped wire or lead to form a hook, or a complete loop or eye, to facilitate making the electrical connection of the leads in these electrical devices, and to do this bending automatically in conjunction with and operated by and as a part of the cutting-off and stripping machine, so that as the leads leave this machine they are complete and ready for assembling and connecting them in the electrical device.

A further object is to provide a device of this character which may be assembled and applied to lead wire cutting and stripping machines already installed, and which will use motions and operations of this machine as a part of the operation of bending one end of the stripped lead.

With the foregoing and other objects in view,

I have devised the construction illustrated in the accompanying drawings forming a part of this specification. It is, however, to be understood the invention is not limited to the specific details of construction and arrangement shown, but may embody various changes and modifications within the scope of the invention.

In these drawings:

Fig. 1 is a front elevation of the machine with parts broken away to more clearly show the construction;

Fig. 2 is a sectional view along line 22 of Fig. 1 showing a top plan view of a cam for controlling the opening and closing of the wire feed fingers and connected parts;

Fig. 3 is a partial section and partial side elevation showing the wire feed fingers;

Fig. 3a shows these fingers in dotted lines in closed position;

Fig. 4 is a front elevation of the feed mechanism on a larger scale than Fig. 1 showing it in another position from that of Fig. 1, various associated parts being shown in section, this section being substantially on line 4-? of Fig. 5;

Fig. 5 is a top plan view of the lead wire cuttin ofi and stripping mechanism;

Fig. 5a is a face view of a pair of the stripping knives in the closed position;

Fig. 5b is a similar view showing the knives in the open or separated position;

Fig. 6 is a rear elevation of the main portions of the machine with therear wall of the base frame or housing broken away to show the various cams and associated elements;

Fig. 7 is an elevational view looking from the right of Fig. 6 showing part of an operatin shaft;

Fig. 8 is a top plan view of the feed cam;

Fig. 9 is a top plan view of the stripping cam and associated parts, a portion of the housing being shown in section;

Fig. 10 is a detail elevation of the mounting connection of certain of the parts looking from the right of Fig. 9;

Fig. 11 is a top plan view of the bending device showing how it is applied to the machine frame;

Fig. 12 is a top plan View of a form-of bending device for bending a hook in the end of the lead wire, showing the jaws open, but after some movement from the full open position;

Fig. 13 is a view of the front ends of the jaws showing them in the next position;

Fig. 14 is a similar view showing the jaws in the closed position;

Fig. 15 shows the jaws again open at the end of the cycle, just before removal of the bent lead wire;

Fig. 16 is a side elevation looking from the right of Fig. 12;

Fig. 1'? is an end elevation looking toward the bottom of Fig. 12; v

Fig. 18 is a top plan view with the jaws removed;

Fig. 19 is a longitudinal section substantially on line |9-I9 of Fig. 12;

Fig. 20 is a transverse section substantially on line 20-2ll of Fig. 12;

Fig. 21 is a transverse section substantially on line 2 l2l of Fig. 13;

Fig. 22 is a plan view of a bent end of the lead wire showing the open or hooked end;

Fig. 23 is a similar view showing the closed or eyelet loop;

Fig. 24 is a view similar to Fig. 12 showing a plan view of a modified arrangement of jaws for bending a complete loop or eyelet in the stripped end of the lead wire and showing the jaws in the open position. It also shows the stripped end of the lead wire in position for the bending operation;

Fig. 25 is a longitudinal section substantially on line 2525 of Fig. 24;

Fig. 26 is a top plan view of the jaws of Fig. 24 showing the next position;

Fig. 27 shows these jaws in the next position, and

Fig. 28 shows the jaws in the next position with a looped lead wire.

The machine comprises a base I onwhich is mounted the machine frame or housing: 2. At the lower part of this frame is the main drive shaft 3 (Figs. 1 and 6) operated by any suitable means such, for example, as electric motor 4, and at the opposite end may be a hand wheel'5'to permit hand operation of the machine for setting up and adjusting purposes. On the shaft 3 is a worm 8 meshing with the worm wheel] secured on the upright cam shaft 8 for driving it, and secured on this shaft are the various operating cams comprising the feed cam 9, the cam In for.

shifting the wire grippin means for performing the stripping operations, the cam II for operating the cutting-off and stripping slides, and the cam I2 for controlling the opening and closing of the'gripping'fingers for the stripping and feeding operations. Cams I9 and I I are combined on one member I 3, cam IO'bein cut in the top of this member and the cam II in the under side thereof. Also mounted in the frame but located to one side of the shaft Bis an upright intermediate or pilot shaft I4 forming supports and pivots for certain of the arms and levers operated by cer tain of these cams.

The feed operating cam'9 (Figs. 6 and 8) includes a cam groove- I5 'in which runs'the roller I6 on a lever arm I! pivoted at I8 to a bracket E9 on themachine frame; and adjustably mounted on this-lever arm is a block 28 to which is pivotally connected a link 2| pivotally connected at 2Ia to a feed'arm 22' (Fig. 9) pivoted at 23 on an oifset=lever 24, pivoted at 25 to the bracket arm 29 mounted on the machine frame. The outer end" of thisoifset lever is pivotally connected-at 21 to a'link 2B'pivotedat 29 to an arm 30 of the bell crank lever 3| pivoted to turn freely on'the pilot shaft I 4, the other arm 32 carrying the roller 33 running in the cam slot 34 of "the cam'IO. On the front upper part of the machine is a horizontal guide 35 on which is mounted the head 36;(Fi'gs. 1 and 4) for longitudinal sliding movement; this head being adjustably connected at 38 through the rod or link 31 to the other end of the feed arm 22 for sliding this head 36 in certain timed relation by the action of cams 9 and 'I 0 "(Figs: 6, 8 and 9) as willbe -more fully described later. The arm 22 comprises two members 22a (Fig. arranged in a sort of V, and

48islidable on a square shaft 41 with the head arm carries a roller 51 running in a cam slot 58 in the finger control cam I2 (Figs. 1, 2 and 6).

Mounted on the front of the machine frame is the lead wire cutting and stripping device 59 (Figs. 1, 4 and 5). This comprises a bracket or base 60 in which is mounted a pair of slides 6| and 62 movable horizontally toward and from each .other and'carrying the lead wire cutting-off

knives

65 and 66, and stripping

knives

63 and 84,

.and 8! and 68, these knives being arranged in pairs opposed to each other as shown in Fig. 5, and with the

knives

63, 65 and 61 carried by the slide 62; and the

knives

64, 66 and 68 carried by the 1 slide. 6|. These knives have opposed V- shapedknife edge cutting ends, as shown in Figs. 5a and 5b, the edges 61a and 88a of

knives

81 and 68* only being shown in these figures. Slide 62 is operated by an arm 69 pivoted to turn on the shaft I4 and carrying a roller I8 running in a cam groove II in cam. II. The slide 62 is connectedztoslid-efifil :by a bar I2 having a rack I3 meshing withan intermediate pinion I4 meshing on:itsi opposite side-with a'rack I5 on the slide 6|, the pinionbeing on a shaft I6 mounted in the bracket 69. It will be understood with. this arrangement the slides BI and 62 are connected together to move simultaneously in opposite directions; so that when the slide 62 is moved inwardly toward the wire 49 by the cam operated arm 89, the slide 8| will be simultaneously shiftedtoward the wire from theopposite side. Similarly, when operated in the opposite direction they'will move awayfrom the wire simultaneously.

The bending device is indicated as a whole by thenumeral I1 (Figs. 1, 4, and 11 to 21) and is mounted by'a bracket 18 through an arm 19 on the frame 2 of the machine by any suitable means, such as thescrewsor bolts (Fig, 11). The bracket includes a forward horizontal guide arm 8| having on its front wall a T-rib 82 forming a slide and guide support for the base block 83 of the bending device, the inner edge of the block 83-being provided with a similarly shaped slot running. on the T-rib or guide. On the top of this block 83 are laterally spaced overhangingside flanges Hand 86 (Figs. 17, 18 and 20) forming guides for the opposite edges of a sliding -plate:8'l; provided at one end with an upstanding block orlug 88. This could be integral with theplate, or as in the structure shown, could be a separate member secured to the plate by any suitable means, such as the screws 89. Pivoted on thetopof the slide plate 81 is a pair of

levers

98 and 9| carrying at their forward ends bending

jaws

92 and 93 opposed to each other, the pivots being shown at 94.

Thebase 83 is provided with a pair of laterally spaced longitudinal slots 95 (Figs. 12, 18 and 21) the main portions of which are substantially parallel and each having at its forward end an inclined portion 99, these portions inclining outwardly in oppositedirections, as shown in Figs. 12 and 18. In these slots are operating pins or rollers 91 for the

levers

99 and 9| and the jaws carried thereby, and the underside of the base 831s provided with elongated recesses 98 following the

slots

95 and 96 to receivethe heads 99 0f these pins. These pins pass through openings 812) (Fig. 21) in the slide 81 large enough to permit the necessary lateral movement of the pins and areseated in openings I00 in the

levers

99 and 9|. The jaw 92 is a horizontally projecting rounded rib formed as part of block IGI which is'secured to the lever 98 by any suitable means, such as the block or'plate I02'fastened by the screws I03. The jaw 93 is formed as part of a similar block I04 held in a recess in the lever 9| by plate I05 secured by the screws I06. Jaw 93 comprises a horizontally projecting rib rounded on the rear or inner side toward the jaw 92, and the jaw 93 as shown in Figs. 12 and 15 is arranged with the ofiset side forwardly of the end of the jaw or rib 92 a distance equal to about the thickness of the stripped wire 40?).

Mounted for sliding movement in the lever 9i is a slide I07, this slide being mounted by means of a T-shaped rib I08 (Figs. 20 and 21) running in a similarly shaped groove in the side of the lever. It is normally held in the retracted position of Fig. 12 by means of a spring I09 seated at its opposite ends in recesses in the slide I01 and the block I04 of the jaw 93. This slide has an offset end or extension H in the form of a straight lug for a purpose presently to be described. The base 83 is provided with a longitudinal slot I I I in its top wall in which is mounted a key H2 extending through slot 81a in plate 8'! for operating the slide 101, this key having a lug M3 on its upper edge seating in a notch in the under side of slide i0'i. Stop pins H4 and H5 suitably spaced in this slot form limit stops for movement of the key H2 and the slide I01, and stop H5 acts as a means to retract slide I01 in case of failure of spring I09.

Movement of the block 83 on the guide 82 is determined by an adjustable stop formed by the end II6a of a bar II6 mounted on the front of the guide 82 and adjustable longitudinally thereon by a clamping screw II! in an elongated slot H8 in the stop. A spring [I9 (Fig. 1) connected to the lug or block 88 by having its ends passing through an opening I20 in the block and secured at its other end to the bracket 69 tends to shift this whole device to the left as viewed in Fig. 1, or downwardly as viewed in Fig. 12 for the reverse or return movements. The jaw block IOI is provided with a recess I2I in which is a release or stripper member I22 at the inner side of the jaw 92. It is mounted on a rod 123 slidable in the block I92 and is embraced by a spring I24 which tends to move it outwardly or downwardly as viewed in Fig. 12, and mounted on the base 83 is a stop I26 adapted to be engaged by the end of the rod I23 at the end of the outward or reverse movement of the slide plate 8'! to push this rod and the stripper I22 inwardly to release the bent wire from the jaw 92 at the end of the cycle, as will presently be described.

The operation is as follows:

We will assume that the insulated wire 49 (Figs. 1, 4 and 5) has been drawn from the supply spool or reel I26 and a lead of proper length has been cut off and bent and discharged from the machine. The end of the wire is then against the cut-off

knives

65 and 66 of Fig. 5. The finger grips 43 are to the left of these knives, as indicated in dotted lines 43a (Fig. 4) and it will be seen that in this position, as shown in Fig. 5, the forward end portion 490 of the insulation is between the cut-off

knives

65 and 66 and the

stripper knives

63, 64. The

stripper knives

63, 64 and 61, 58 are set so as to move just far enough to cut through the insulation but not to cut the metal wire, as shown in Fig. 5a. The cam I2 by operating the square shaft 41 clamps these fingers 43 onto the wire so as to grip it. Now the cam I9 shifts the offset lever 24 (Fig. 9) through the bell crank 31 by swinging the arm 32 inwardly as viewed in Fig. 9, which thus throws the pivot 23 of the feed arm 22 outwardly or to the right as viewed in Fig.9. This swings this arm 22 about the con.-

nection 2Ia which is a pivotal connection to the link 2I which is now stationary, and thus swings the free end of the lever arm 22 to the left as viewed in Fig. 9. This action, through the rod 37, shifts the head 36 and the fingers 43 a short distance to the left from the dotted position 43a to the dotted line position 43b Fig. 4. This movement carries the wire 40 with the fingers 43 stripping the length 400 of the insulation from the end of the wire, which is the short end of this wire.

At this time feed cam 9 operates the feed arm 22 to the right, as viewed in Figs. 1 and 4, and the cam II through the arm 69 shifts the blocks BI and 62 outwardly to separate the cutter and stripper blades, which permits the fingers 43 gripping the wire 40 to pass to the right between these blades to the full line position 430 of Fig. 4. This action of the gripping fingers, of course, carries with them the wire with the stripped end 40b, and now the cam II shifts the blocks 6|, 62 in the opposite direction to close the stripping and cut-off blades to the position of Fig. 5. In this action the cut-off

blades

65, 66 cut off the length of lead wire 46a, the

blades

63 and 64 cut the insulation to the left of these blades, as above described, while the

blades

61 and 68 cut the insulation at the proper distance to be stripped from the rear end of the cut off length 40a, this length being shown at 40d. After this action the cam I0 shifts the offset lever 24 (Fig. 9) to the left about its pivot 25 Or toward the front of the machine, swinging the pivot 23 to the left as viewed in Fig. 9, thereby swinging the free end of the arm 22 to the right (link 2| and pivot 2Ia being stationary) and through the rod 31 shifts the head 36 and the fingers 43' to the right to the dotted line position 43d in Fig. 4. This will strip the insulation 4001 (Fig. 5) from the rear end of the cut-off lead 40a.

At the beginning of this stripping action the forward stripping end 20b is in position to be formed between the jaws 92, 93 (Fig. 12). As the head 36 carrying the gripping fingers 43 moves forwardly for this stripping action, a stop lug or arm I21 (Figs. 1, 4, 12, 16 and 19) hits the head or lug 88 of the bending device, as shown in Fig. 4, and therefore carries this lug and the slide plate 81 and the bending jaws carried by this plate along with it to the dotted line position 88a. This is also the position of Figs. 14 and 19. Movement of the base 83 is prevented by the adjustable stop member H6, and this stop member can be adjusted to position the base 83 and therefore the bending device at the proper position to start this movement of plate 81 at the proper time with the' head 36. As previously stated, when this movement of the plate 6'! starts, the stripped end 40b of the insulated cut-off lead 40a is inserted between the bending

jaws

92 and 93, and as the plate 61 together with these jaws now moves forwardly at the same speed as the head 36 and the fingers 43 carrying this cut-off strip 40a, it remains in this relative position with respect to these jaws. During the first part of this forward movement, the rollers or pins 91 move along the inclined portions 96 of the slots 95 and by swinging the levers and 9I, move the

jaws

92 and 93 inwardly toward each other against the opposite sides of the stripped wire 4% to the position of Fig. 13. It will be seen that in this position the jaw 93 has bent the free end of the wire around the edge of the jaw 92 through an angle of about 90, and the insulation on the lead 40a-hasbeen gripped by the inner side-

surfaces

92a and 93a (see Fig. 12) of thejaws soas to hold. the wire in proper position in the. jaws.

It will be seen from Fig. 13 that in this position the free end of the stripped portion 40b is in alignment with the offset lug or extension I I on the slide I01. At this point the key I I2. (Fig. 19) engages the stop II4', which therefore prevents further movement of. the'slide I 01 fore wardly with the plate 81 and the bending. jaws. As the plate 81 and the jaws continue to. move forwardly, the motion of key I I2 and the slide I0! is therefore'stopped and continued movement'of the jaws 'withthe wire carries them to theposition of Fig. 14. As it moves to this position the free end of the wire hits the end of the extension H0 and it is bent'to the hooked position of Fig. 14. This completes the bending, of the hook in the stripped end ofthe wire and is theposition of Figs. 14 and 19. This movement also, as previously indicated, completes the stripping of the portion of insulation 40dfrom the rear or left hand end of the cut-off lead 40a. Cam I2: now opensthe feed jaws 39 and feed cam'9 operates to swing the free end of the feed arm 22 to the left or in the return direction and the spring II9 (Fig. 1) moves the. slide 8! and the bending jaws backwardly or to the left, until at the end of this movement the end of the stripper rod I23'hits the stop I25 pushing the stripper I22- forwardly, as shown in Fig. 15, to release the bent endof the wire from the jaw 92." In moving to this position the pins or rollers 91 have moved back into the inclined slots 96 and have opened the jaws for the. next operation. This releases the bent cut-off lead from the jaws, and as at this time the cam I2 has operated the square rod 41 toopenthe clamping fingers 43, as shown in dotted lines at 43e (Fig. 3), the cut and stripped lead with the bent end drops from the machine. Continued movement to the left of the head 36- under action of'the feed cam 9 and the feed arm 22, and with these fingers 43 in the open position, carries them between the cut-off and stripping knives63to 68 to the dottedv line position 43a of Fig. 4, in preparation'for the next feeding and stripping operation, after which the cycle is repeated. The fingers are closed onto the wire 40, it is shifted to the left to strip the forward end 400, and then it is fed forwardly for the cutting-off, stripping and bending actions, as described.

Briefly then, the operation is: the fingers grip the wire, shift it a short distance to the left to strip the forward or short end, then these gripping fingers are advanced through the open knives to feed the wire the proper length'required. Then the knives close to cut off this length and at this time the forward end which has already been stripped has been inserted between the bending jaws, but movement of the bending device at thispoint has not started; Then further movement of the head 36 with the gripping fingers advances the cut off wire for the stripping of the rear end of this cut off lead and at the same time moves the jaws of the bending device forwardly with the head 36 and the cut off wire, which movement operates the jaws to bend the forward stripped end" of the .wire to form the hooked end 40f, as shown in Fig. 22. Then the-head 36 and associated parts are shifted to the left or in the reverse direction, permitting the bending jaws to be shifted to the normal and open position by the spring I I9; releasing the bent and cutoff lead andmov ing the parts to positions for starting the cycle '8 all over again- Feedjaws 39 are opened attho beginning of the left hand or. reverse motion and the hooked lead is ejected when the jawsof the bending device are opened.

In the form of the device of Figs. 12 to 21, the end of the wire is bent to a hook shape, as shown in Fig. 22. However; it may be desirable to bend it'to a complete loop or eyelet, as indicated at 409 (Fig. 23). A bending device modified to securethis result is shown in Figs. 24 to 28. In this device the base I28 corresponds to the base 83 of the devices of Figs. 12 to 21, and has similar overhanging side flanges I29 forming guides for the opposite edges of the movable sliding plate I30 corresponding to plate 81 of the first form. Secured to the forwardend of this plate is the same upstanding operating lug or head 88 for shifting this plate and'the jaws during the bending operation. Pivotally mounted on the plate I30 by the pivots I3I are the levers I32 and I33 carrying at their free ends the bending jaws I34 and I35, these jaws both being concave jaws, as shown in Fig. 24, and substantially semi-circular in shape, although the jaw I35 is provided with a recess I38 extending inwardly-from the end to about half the concave portion on the level with and to receive the lead wire 46a being bent. Between the'two jaws I34-and I35 is a slidable pin I3'I about which the stripped end of the wire is bent to form the loop or eyelet. This is slidable vertically in an opening in the plate or slide I30, and when the jaws are open it is in the lower or retracted position below the jaws I34 and I35, as shown in full lines in Fig.

" 25, it being shifted to and normally held in this position byspring I38. It is shifted to its upper or dotted line position with its upper end between the'jaws I34 and I35 during thebending operation by sliding its head I3Ia on the inclined cam surface I39 formed in the base I28. This base is also provided with two longitudinal slots for operating the'bending jaws. The roller orpin I40 in the lever I32 projects into a slot in the base I28 comprising a straight longitudinal portion MI and at its forward end an inwardly inclined portion I42. A roller or pin I43 in the lever I33-runs in aslot in the base I28 comprising a longitudinal straight portion I44 and a rearwardly and outwardly inclined forward. end portion I45. Also mounted in the lever I33 is a slide I46 having a T-rib I 41 running in a similarly shaped guide I48 on the inner edge of the lever I33. This slide may move longitudinally of lever I 33 and is notched at its rearward end portion as indicated at I49 to provide a reduced offset end or extension I50 similar. to the extension IIO of the first form, except that it is considerably longer and is provided with av rectangular opening I5I. This slide I48 is operated by a-key I52 running in a longitudinal groove I53 in the base block I28 and it operates between two stop pins I54- and I55 projecting into this groove. A'lug I56 on the upper'edge of this key seats in a similar recessin the under side of the slide 46 for operating it.

In operation, this device goes through the same cycle and series of operations with the feeding head 36 of'the machine as the device of Figs. 12 to 21; that is, on the forward movement of the head 36 and the fingers 43 to feed the length of lead 40a to be cutoff, the stripped forward end 401) isinserted between the jaws I34 and I35,..as shown in Fig.1 24. At this point, which is the beginning'of the stripping'operatlonzfor the rear end 4011 of the cut on lead length, the-lug I21 on 'head 36 engages the head or block 88, and during this stripping movement of the cut off lead 400. it shifts the slide I30 to carry it along with this head 36, the same as described in connection with the device of Figs. 12 to 20. During the first part of this movement the cam I39 shifts pin I31 upwardly to the dotted line position of Fig. 25 and to its position betweenthe jaws I34 and I35. During the first part of this movement, as the roller or pin I40 of lever I32 is in the straight portion I4I of the slot in the base block I28, the jaw I34 does not move inwardly, but as roller or pin I43 of lever I33 is in the inclined portion of its operating slot, the jaw I35 is' shifted inwardly to the position of Fig. 26. During this movement the slide I46 retains its same position with respect to the lever I33 and the parts are now in the position of Fig. 26. During this movement the jaw I35 has bent the free end 40b of the wire through a right angle about the pin I31 with its free end in alignment with the end of the extension I50. At this point the forward end of the key I52 engages the stop I54 so that further movement of the slide I46 with the slide plate I30 is arrested. Therefore, as the plate I30 and the swinging jaws I34 and I35 carried by it continue to move forwardly, the slide I46 remains stationary and the pin I31 and jaw I35 are carried beyond the free end I50 of the slide to the position of Fig. 27. The jaw I35 and pin I31 are now opposite the opening II through the extension I50. In this movement the extension I50 has bent the free end of the wire another 90 about the pin I31, as indicated in Fig. 27. During this movement the roller or pin I43 is moving in the straight longitudinal slot I44 to maintain the jaw I35 stationary and hold the wire on the pin I31. Continued movement of the slide plate I30 forwardly now carries the roller or pin I40 of the lever I32 into the inclined portion I42 of its operating slot, and by camming action of this slot the free end of the lever is swung inwardly carrying the concave jaw I34 to the position of Fig. 28. During this movement the projecting concave jaw I34 is carried through the opening I5I in the extension I50 and completes the bending of the free end of the wire about the pin I31 to complete the closed loop or eyelet shown at 409 in Fig. 23. On reverse movement, or movement to the left, of the feed head 36, this operation is reversed, the slide plate-I30 with the parts carried thereby being shifted back to its normal position of Fig. 24 by the spring II9, the same as in the first form. During this movement, the rear end of the key I52 engages the stop I55 and shifts the slide I46 back to its position of Fig. 24. Also, at the end of this reverse movement the head of the pin I31 slides down the cam surface I39, permitting spring I38 to retract this pin out of the loop in the wire, thus releasing this wire and the cut off lead so that it drops from the machine and the device is ready to receive the stripped end of the next cut off lead, and the cycle is repeated. Other means could be used to operate this pin.

Thus it will be seen from the above that the movements and operations of the wire out 013 and stripping machine are employed to operate this bending device, this device really becoming a part of the cut off and stripping machine and operates as an integral part of it, and in definite timed and synchronized movement with the movements and operations of this machine, so that now the machine automatically performs the complete operations of cutting off the lead wire to length, stripping the insulation from pre determined portions of the opposite ends of the cut off length, and then bending the stripped lead at one end to a loop, either an open hooked loop or a closed loop or eyelet. The bending device, however, may be assembled as a distinct unit and applied to cut-off and stripping machines already installed, employing parts and motions of these machines for its operation.

The means described for operating the slides, levers and jaws of the bending device are one effective way of operating them, but it will be understood other operating means may be employed.

An additional advantage to the automatic operation of this device is that the ends of all 'of the leads are bent uniformly, greatly facilitating the assembly of the leads in the electrical devices. This is not true where the ends are bent by hand, as with hand operation there is considerable variation in the bent ends. Throughout the specification and claims where the term loop is employed it is intended to include either the open or hooked form of the loop or the closed loop, unless otherwise particularly stated.

Having thus set forth the nature of my invention, I claim:

1. In a machine for preparing electrical conductor leads comprising means for stripping the insulation from the free end portion of an insulated lead wire, means for feeding the wire forward a given amount to determine the length of the lead, means for cutting off the advanced lead to length, and means for advancing the cutoff lead longitudinally, bending jaws arranged to receive the stripped forward end of the wire as it is shifted to the cut off position by the feeding means, and means for operating the jaws during advancing movement of the cut off lead to bend a loop in the stripped end of the wire.

2. In a machine for preparing electrical conductor leads comprising means for stripping the insulation from the free end portion of an insulated lead wire, means for feeding the wire for ward a given amount to determine the length of the lead, means for cutting off the advanced lead to length, and forwardly movable means for advancing the cut off lead longitudinally, bending means arranged to receive the stripped forward end of the wire as it is fed forwardly and capable of bending a loop in said wire end, and means operated by forward movement of the lead advancing means for operating the bending means.

3. In a machine for preparing electrica] conductor leads comprising means for stripping the insulation from a free end portion of an insulated lead wire, and forwardly movable means 'for advancing the stripped wire longitudinally, bending means arranged to receive the stripped end of the wire as it is advanced by said means and capable of bending a loop in said wire end, and means operated by further forward movement of the wire advancing means for operating the bending means. i

4. In a machine for preparing electrical conductor leads, means for stripping the insulation from a free end portion of an insulated wire including a movable member, means for bending a loop in the stripped end of the wire including a base member, a slide slidable on the base member, a pair of laterally movable jaws on said slide capable of cooperating to bend the end of the wire, cooperating means on the base and slide to operate the jaws by movement of the slide, and

nleans operated by the movable member to shift the slide to operate the jaws to bend the wire.

"5. In a machine for preparing electrical conductor leads, means for stripping the insulation .froma free end portion of an insulated wire ineluding a movable member, means for bending 'basemember provided with cam means, a movableslide on said base, opposedjaws on the slide arranged to grip opposite sides of the wire to form the loop, means on the slide cooperating with the cam means to shift at least one jaw to grip the wire by movement of the slide, and means operable by said movable member to shift the slide.

7. In a machine for preparing electrical conductor leads, a base member, a movable slide mounted on said member, means on the slide for bending the stripped end portion of an insulated wire to form a loop comprising a pair of pivoted levers mounted on the slide, opposed bending jaws carried by said levers, said base being provided with cam slots, means carried by the slide running in the slots and connected with the levers for operation by movement of the slide to operate the levers to bend the wire through substantially a right angle about one jaw, a second slide mounted on one lever and provided with an extension at one end movable against said bent end to bend it further about the jaw, a. lost motion connection between the second slide and the base including a stop to limit movement of the second slide relative to the base, and means for shifting the first slide to operate the jaws-and the second slide.

8. In a machine for preparing electrical;conductor leads, a base member, a movable slide .mounted on said member, means on the slide forbending the stripped end portion of an insulated wire to form a loop comprising a pair of l opposed jaws pivoted to the slide to move toward and from each other, said base being provided with cam slots, means in the slots and connected with the jaws for operating them by movement of the slide to bend a wire about one jaw, a stripping member mounted on a rod slidable in the latter jaw and located in alignment with the bent loop, means for shifting the slide in one direction to close the jaws to bend the loop and to shift the slide in the reverse direction to open the jaws, and stop means to engage the rod at the end of the reverse movement to shift the stripping member to release the bent loop from the jaw.

9. In a machine for preparing electrical conductor leads, a base member, a movable slide .mounted on said member, means on the slide for bending the stripped end portion of an. insulated wire to form a loop including opposed laterally movable jaws, a slidablepin locatedbetween the jaws, cam means in the base, anoperativeconnecting means from the cam means to shift .one

'of the jaws to bend the wire to approximately a right angle around said pin, a second slide having .lost motion connectionwith 'the base and provided with an extension movable between the jaws to engage said bent end of thewire and bend it through approximately a further right angle about the pin, said extension being provided with an opening through it in alignment with the pin after the second bending operation, the other jaw being a concave jaw movable through said opening to bend the free end of the bent wire further about the pin, a second cam means in the base, an operative connection from the latter cam'means to the secondjaw, means for shifting the first slide to operate the jaws and second slide, and means for withdrawing the pin from the loop at the end of the bending operation.

'10. In a machine for preparing electrical conductor leads, meansfor stripping the insulation from the free forward end ,portionof an insulated lead wire, forwardly movable means for feeding the insulated wire forward a given amount to determine the length of the lead, means for cutting off the lead at a distance from said stripped end, meansforwardly of the feeding means for bending a loop in the stripped end of the wire arranged to receive said end on a forward movement of the wire by the feeding means, and means operated by further forward movement of the feeding means .for operating the bending means.

11. In a machinefor preparing electrical conductor leads, meansfor stripping the insulation from the free end portion of an insulated wire lead, forwardly movable means for feeding the insulated lead wire forward a given amount to determinethe length of the lead, means for .cutting off the lead to length, movable jaws capable of bending the stripped end of the wire between them to form a loop, means for operating the feeding means forwardly to insert the stripped end of the lead in said. jaws, and means operated by furtherforward movement of the feeding means to operatethe jaws to form the loop.

l'2.,.In.a machine for preparing electrical conductor leads, means operable by longitudinal movement of an insulated lead wire for strip- .ping a portion of .the insulation from the free end of the wire, forwardly movable means for feeding the insulated lead wire forwarda given amount to determine the length of the lead, means for cutting off the lead tolength, means for bending thestripped endportion of the lead into .ailoop, means for operating the feeding means to carry the stripped .end to the bending means, and means operated by further movement of the feeding means for operating the bending means.

13. In a machine for preparing electrical conductor leads. comprising means for stripping the insulation from the free end portion of .an insulated lead wire, forwardly movable. means for feeding the wire forward a given. amount to determine the length of thelead, means for cutting off the advancedjleadto length backwardly from the stripped end, and means for shifting the ,feeding meansto advance the out off lead longitudinally, means for bending aloop in the stripped end of the wire arranged to receive the stripped end as thecut off lead is advanced, and means operated by further movement of the leadadvancing .meansfor operating the bending means.

.14. .In amachinefor preparing electrical con- ..ductor leads, .means .'for holding and cutting a portion of the insulation at a free end portion of an insulated lead wire, longitudinally movable feeding means for shifting the wire backward to strip the cut insulation from the wire, means for bending a loop in the stripped end of the wire, said feeding means arranged to shift the wire forward to insert the stripped end in the bending means, means operated by forward movement of the feeding means for operating the bending means, and a main driving means for operating the stripping means and the operating means for the bending means.

15. In a machine for preparing electrical conductor leads, means for stripping the insulation from a free end portion of an insulated wire including a forwardly movable member, means for bending a loop in the stripped end of the wire, means movable with said member for feeding the wire forwardly and inserting the stripped end in the bending means, and means operated by further forward movement of said member for operating the bending means.

16. In a machine for preparing electrical conductor leads, means for stripping the insulation from a free end portion of an insulated wire including a forwardly movable member, means for bending a loop in the stripped end of the wire comprising movable jaws to grip opposite sides of the wire, means movable with said member for feeding the wire forwardly and inserting the stripped end into said jaws, and means operated by further forward movement of said movable member to operate said jaws to bend the wire.

17. In a machine for preparing electrical cn ductor leads, means for stripping the insulation from a free end portion of an insulated wire including a movable member, a base member, a movable slide mounted on said member, means mounted on the slide and movable therewith for bending the stripped end portion of an insulated wire to form a loop, cooperating means on the slide and base operated by movement of the slide on the base for operating said bending means, and means operable by said movable member for shifting the slide to operate the bending means.

18. In a machine for preparing electrical conductor leads, a base member, a movable slide mounted on said member, means mounted on the slide and movable therewith for bending the stripped end portion of an insulated wire to form a loop including opposed jaws at least one of which is movable, means for feeding the stripped end of a lead into a position between said jaws including a movable member, said base being provided with a cam slot, an operating means connected to the movable jaw and running in said slot, and means operable by the movable member for shifting the slide to operate the jaw through said operating means and slot.

19. In a machine for preparing electrical conductor leads, a base member, a movable slide mounted on said member, means on the slide for bending the stripped end portion of an insulated wire to form a loop comprising a pair of opposed jaws pivoted to the slide to move toward and from each other, means for feeding the stripped end of a lead into a position between the jaws including a movable member, said base being provided with cam slots, means in the slots and connected with the jaws for operating them by movement of the slide to bend a wire between them, and means operable by the movable member for shifting the slide to operate the jaws.

JOHN VOLLMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 155,657 Lewis Oct. 6, 1874 375,577 Short Dec. 27, 1987 383,084 Wilder May 15, 1888 418,512 Griswold Dec. 31, 1889 592,727 Frantz Oct. 26, 1897 1,262,334 Handke Apr. 9, 1918 1,304,780 Kepler May 27, 1919 1,581,105 DIncognito Apr. 20, 1926 1,733,294 Cross Oct. 29, 1929 1,787,658 Andren Jan. 6, 1931 1,828,413 Holmes Oct. 20, 1931 2,393,364 Goldfield Jan. 22, 1946 2,434,591 Schaefer Jan. 13, 1948 FOREIGN PATENTS Number Country Date I 28,387 Great Britain Dec. 24, 1903