US2849032A - Lamp filament mounting apparatus - Google Patents

Description

*limit Aug. 26, 1958 Filed Feb. 28, 1955 H. D. RowAN x-:TAL

LAMP FILAMENT MOUNTING APPARATUS 2 Sheets-Sheet 1 Inventors: Hartley D. Rowan. Edward C. De eorge, by M57? Their` A orney Aug. 26, 1958 H. D. RowAN ETAL LAMP PILAMENT MOUNTING APPARATUS 2 Sheets-Sheet 2 Filed Feb. 28, 1955 eGeorge,

Inventors Hartley D. Rowan. Maw

Their Attorney Edward C. D

United States Patent() 2,849,032 LAMP FELAMENT MUNTING APPARATUS Hartley D. Rowan, Cleveland, and Edward C. De George, Parma, Ohio, assignors to General Electric Company, a corporation of New York Application February 28, 1955, Serial No. 491,113 12 Claims. (C1. 140-71.6)

Our invention relates to apparatus for mounting lamp filaments and the like automatically, and more particularly to apparatus for mounting a relatively short length of filament wire between closely spaced leading-in wires of a miniature type lamp mount.

Apparatus for automatically mounting incandescent lamp filaments must be capable of performing the difficult task of feeding and handling the extremely fine wire of which the filaments are ordinarily made and, in the case of miniature lamps, must also be capable of mounting the extremely line wire within the restricted space limitations of such miniature type lamp mounts. In addition, the apparatus must cooperate in proper time relation with the other automatic means which are customarily provided on indexing type lamp mount-making machines for making and preparing a lamp mount in readiness for the mounting of a filament thereon.

One object of our invention, therefore, is to provide automatic apparatus for mounting fine filament wires on the leading-in vwires of lamp mounts and for performing the mounting operation at relatively high speed with the exactness of control and the freedom from damage to the filament such as is necessary to the production of high quality lamps at low cost.

Another object of our invention is to provide filament mounting apparatus which is adapted to perform the operations of advancing a length of filament wire, at the free end of a continuous supply thereof, into mounting relation to the leading-in wires of a lamp mount, fastening the said length of filament wire to the leading-in wires, shearing off the fastened length of filament wire from the supply thereof, and then recovering the loose end of the supply of filament wire, and to perform these operations by simple and practical means avoiding the intricate and complicated means and added fixtures of prior apparatus.

Still another object of our invention is to provide apparatus for mounting filaments upon pairs of leading-in wires o-f mounts periodically advanced to mounting relation to the said apparatus by a conveyor, and for mounting these filaments in a transverseposition with relation to the direction of movement of the conveyor. A filament mounting apparatus operating in such a manner enables the leading-in wire holding and working means of the mount making machine to be constructed so as to operate with the leading-in wires of the lamp mount positioned in a plane transverse to the path of movement of the mount-supporting conveyor. An additional advantage of such .an operating filament-mounting apparatus is that it can be simply added to a conventional form of mount-making machine of the general type disclosed in Patent No. 1,733,881, Illingworth, dated October 29, 1929, to permit the mounting of a second filament upon a mount after the first filament has been mounted thereon by the mount-making machine. In such conventional type mount-making machines, the leading-in wires of the lamp mount are supported in and retained by a head at the periphery of an indexing-turret, and the filament Ace mounting apparatus is arranged at one of a plurality of work stations occupied by the head in the course of its indexed advance by the turret.

In accordance with one aspect of the invention, a pair of filament wire feeding jaws located at one of the work stations of a mount-making machine are arranged to advance to and from the supply spool of filament wire, located inboard of the mount-carrying turret, to draw from the spool a length of filament wire sufcient to form a filament and locate the said wire length in a position such that it is directly opposite or above the leading-in wires of the lamp mount when the latter is positioned at the filament mounting station of the machine. The wire feeding jaws and the supply spool are then arranged to move downward in unison to drape the wire length constituting the filament over a forming pin so as to form it into hairpin shape and also position it in proper mounting relation to the leading-in wires of the mount which is then indexed to the filament mounting station of the machine to bring the inner ends of a pair of leading-in wires of the mount into engagement with the ends of the filament wire length. A pair of clamping jaws are then arranged to close against the contiguous ends of the filament and the leading-in wires to embed the filament ends in and fasten them to the leading-in wires, after which a knife severs the length of filament wire from the supply thereof to complete the filament mounting operation. According to a further aspect of our invention, the filament wire on the supply spool is drawn therefrom through an lassociated spring-loaded guide which is movable lengthwise of the filament wire therein and is arranged to be pushed back by the wire feeding jaws, upon advance of the latter, so as to expose the free end of the filament wire from the guide and enable the wire feeding jaws to move over and grip the said free end of the filament wire during the wire feeding operation. In accordance with still another aspect of the invention, the filament wire supply spool and the wire feeding jaws are arranged in an initial position above the level of the leading-in wires of the lamp mount on which the filament is to be mounted and in a plane transverse to the path of movement of the mount-carrying head so that a lowering movement of the wire feeding jaws in unison with the associated wire supply spool and the wire guide will operate to drape the filament wire over the forming pin and position the filament in mounting relation to the leading-in wires of the mount which is then indexed to the mounting station of the machine.

Further objects and advantages of our invention will appear from the following detailed description of a species thereof and from the accompanying drawings:

In the drawing, Fig. l is a side elevation, partly broken away, of filament mounting apparatus comprising our invention with the operating parts thereof shown in their initial operative position at the start of their cycle of operation.

Fig. 2 is an elevation, on a slightly larger scale than Fig. 1 of the front side of the lament mounting apparatus with the filament wire supply spool and associated parts omitted therefrom in order to more clearly illustrate the other parts of the apparatus.

Fig. 3 is a perspective view on an enlarged scale of a two-filament lamp mount of the type to which the filament mounting apparatus of our invention is applicable for mounting one of the filaments thereon.

Fig. 4 is a plan View of one of the mount supporting heads of the mount-making machine with an associated lamp mount and the filament wire supply and feeding means of the apparatus shown in dash-dot lines.

Fig. 5 is a fragmentary side elevation of the filament wire feeding and positioning means of the mounting apparatus with the wirefeeding jaws thereof `shown advanced to their filament wire pick-up position and with a lamp mount shown in position in one of the heads of the mount-making machine.

Figs. 6, 7 and 7 are progressive views corresponding to Fig. of the mounting apparatus and showing the successive operative steps performed thereby in mounting a filament upon a pair of leading-in wires of the lamp mount.

Referring to the drawings, the filament mounting apparatus of our invention is a completely self-contained unitary apparatus adapted to automatically mount a length of filament wire between the upright ends of a pair of leading-in wires of a lamp mount 1. The particular lamp mount 1 shown is of the type used in miniature buttseal type incandescent lamps, and in the particular case illustrated is provided with two separate filaments mounted dif-respective pairs of leading-in wires. The filament mounting apparatus of our invention is shown in the drawings as incorporated in a conventional mount-making machine of the general type disclosed in the above mentioned Illingworth Patent No. 1,733,881 and comprising an indexing turret 2 provided around its periphery with a plurality of mount-carrying heads 3. The filament mounting apparatus is located adjacent the path of travel of the mount-carrying heads 3 of the machine at Birre-of the work stations thereof, and in the particular instance shown is adapted to form and mount the second filament on the lamp mount 1 after the first lament has been mounted thereon at a previous work station of the machine. As shown in Fig. 3, the lamp mount 1 comprises a coiled filament 4 connected across a pair of leading-in wires 5 and 6 and a second hairpin-shaped straight wire filament 7 connected across a second pair of leadingin wires 8 and 9 so as to span the first filament 4. The four leading-in wires 5, 6, 8 and 9 of the mount 1 are joined together and held in insulated relation to each other, to form a unitary structure, by a vitreous or glass bead 10.

The filament mounting apparatus of our invention is designed to perform the operations necessary to form and mount the hairpin shaped filament 7 on the leadingin wires 8 and 9, and it performs these operations as the last step in the making of the lamp mount 1. The lamp mounts 1 are supported in the mount-carrying heads 3 of the machine in a position with the filament-carrying inner end portions of the leading-in wires extending more or less vertically upward from the glass bead 10 and with the pair of leading-in wires 5 and 6 lying in a plane tangent to the direction of movement thereof around the machine and with the other pair of leading-in wires 8 and 9 lying in a plane transverse to the said direction, or in other words radially of the turret 2. The positioning of the pair of leading-in wires 5, 6 in a plane tangent to the direction of advance movement of the heads 3, in the manner as the two leading-in wires of a single filament mount are customarily positioned during the manufacture thereof on conventional mount-making machines, therefore enables the operations required to mount the coiled filament 5 on the mount 1 to be performed by conventional mount-making apparatus such as disclosed, for example, in the previously mentioned Illingworth Patent 1,733,881. However, the positioning of the other pair of leading-in wires 8, 9 of the mount 1 in a plane at right angles to the plane of leading-in wires 5, 6 and disposed radially of the turret 2 necessitates the use of filament mounting apparatus of entirely different construction from that conventionally employed and, in addition, requires the use of a specially constructed mount-carrying head 3.

As shown in Fig. 4, the lamp mount 1 is supported in the head 3 through the gripping force of a pair of pivotable jaws 11 and 12 which engage and clamp the outer end portions of the leading-in wires 5, 6, 8 and 9, at points beneath the supporting glass bead 10, against the sides of a fixed separator jaw 13. The jaws 11, 12 and 13 extend more or less radially of the turret 2 and outwardly beyond the periphery thereof, and the outer ends or gripping faces of the jaws are disposed obliquely to the path A of travel or index movement of the head 3. The separator jaw 13 maintains the two leading-in wires of each pair thereof in predetermined spaced relation at all times. The outer or movable jaws 11, 12 are pivoted upon pins 14 extending from the turret 2 so as to be pivotably movable in a horizontal plane, and in each instance they grip two of the leading-in wires, i. e., one wire of each pair thereof. Thus, jaw 11 grips the two leading-in wires 5 and 8 while jaw 12 grips the other two leading-in wires 6 and 9. The oblique positioning of the jaws 11, 12 and 13 to the path of index movement of the head 3 thus adapts the head 3 to the supporting of the lamp mount 1 with one pair of leading-in wires 5 and 6 disposed in a plane tangent to the path A of index movement of the jaws and the other pair of leading-in wires 8 and 9 disposed in a plane transverse thereto. The movable jaws 11 and 12 each grip the two lead-in wires engaged thereby with equal pressure, the said jaws being provided for such purpose with face or gripping plates 15 arranged for independent pivotal movement about respective pivot pins 15' on the ends of the jaws 11 and 12. The face or gripping plates 15 are of U form adapting them to straddle the ends of the jaws l1 and 12 and giving them sufficient freedom of pivotal movement about the jaw ends to cause them to bear properly and uniformly against each of the two leading-in wires gripped thereby.

The cycle of operation of the filament mounting apparatus of our invention begins while the lamp mount 1 on which a filament 7 is to be mounted is still positioned at that work station of the machine immediately preceding the filament mounting station thereof and before index away from the latter station of the mount 1 which has just been provided with a filament 7. The mounting operation is initiated by the operation of filament forming and positioning mechanism F to withdraw, from a spool 16 of filament wire located inboard of the turret, a length of filament wire 7 approximately sufficient to form the filament 7 to be mounted on the lamp mount 1. The filament wire 7 is withdrawn from the spool by the advance and retractive movement of a pair of wire- feeding jaws 17 and 18 which are horizontally reciprocable in a direction radially of the turret, the jaws 17, 18 advancing to engage and grip the free end of the filament wire 7 extending from the supply spool 16 and then retracting to draw off the spool the required length of filament wire 7' for the lament 7. The supply spool 16 is pivotally mounted on the inner end of a support arm 19 which overlies the peripheral portion of the turret 2, the supply spool for such purpose being provided with pivot studs 26 at each side thereof which rest in bearing slots 21 in the support arm 19. The supply spool 16 and the wire feeding jaws 17, 18 are mounted in opposed relation to each other, and in their initial operative position, during which time the jaws 17, 18 operate to withdraw the filament wire from the spool, they are located at an elevation slightly above that of the mount 1 in the head 3, as shown in Fig. 5. The filament wire supply spool 16 as well as the wire feeding jaws 17 and 18 are mounted on a vertically reciprocable carriage 22 which is supported on a slide 23 vertically reciprocable in a guide bracket 24 upstanding from the base 25 of the mounting apparatus. The wire feeding jaws 17 and 18 are constituted by integral springcontractable arm extensions on a subslide 26 which is mounted for horizontal sliding movement, radially of the turret 2, within a main slide 27. The main slide 27 is also mounted for horizontal sliding movement, radially of the turret 2, within horizontal ways in the carriage 22.

In the operation of the filament wire feeding mechanism to withdraw a length of filament wire 7' from the supply spool 16 thereof, the wire feeding jaws 17, 18 are first advanced horizontally from their retracted position (as shown in Fig. l) to an advanced or wire pick-up position (Fig. 5) relative to the free end of the filament wire 7 which is located within a spring-loaded guide 28 through which the filament wire passes as it is withdrawn from the supply spool thereof. The wire feeding jaws 17, 18 are contracted to their closed or wire-gripping position by means of the engagement of cam surfaces 29, thereon with corresponding inclined cam portions 31, 32, respectively, provided on the main slide 27 at the forward end thereof. During the advance movement of the wire feeding jaws 17, 18 and the associated subslide 26 to their advanced or wire pick-up position, the subslide 26 and the main slide 27 are interlocked so as to move as a unit by means of the engagement of a spring-loaded locking pin 33 carried by the main slide within an aperture or pocket 34 in the subslide. In such interlocked position the main slide 27 is held in a position sufciently advanced relative to the subslide 26 to disengage the cam portions 31, 32 of the main slide from the cam surfaces 29, 30 of the jaws 17, 18, thereby enabling the jaws to spring apart to their uncontracted or open position for entry of the filament wire 7 therebetween. The locking pin 33 is normally urged downwardly into its locking position within the aperture 34 by means of a compression coil spring 35 interposed between the head of the locking pin and a bracket 36 mounted on the back end of the main slide 27.

The advance and retractive movement of the interlocked slides 26 and 27 and the associated wire- feeding jaws 17, 18 is effected by a vertically extending operating lever 37 which engages at its upper end with a roller 38 provided on the subslide 26 at the outer or rear end thereof. The operating lever 37 is pivoted at its lower end on a pivot pin 39 mounted in a bracket 40 extending from the base 25 of the mounting apparatus. Intermediate its ends, the operating lever 37 is provided with a cam follower roller 41 which rides within a cam groove 42 in a drum cam 43 mounted on an auxiliary or cam shaft 4 44 of the mounting apparatus. The advance and retractive movement of the subslide 26 and associated wirefeeding jaws 17, 18 occurs in timed relation to the dwell of each mount-carrying head 3 at the work station at which the filament mounting apparatus is located, and it is controlled by independent operating means disposed within the base 25 of the mounting apparatus and actuated from the main driving means or shaft (not shown) of the mount making machine in a manner corresponding to that of the other mount making mechanisms (also not shown) at the other work stations about the turret 2, as disclosed in the aforesaid Illingworth patent. In the present instance, the main driving means of the mount making machine rotates a main shaft 45, journalled within the base 25, at a constant rotational speed. The main shaft 45 in turn drives the auxiliary or cam shaft 44 through a train of intermeshed gears 46, 47 and 48 mounted, respectively, on the main shaft 45, a stub shaft 49 journalled in the base 25, and the auxiliary or cam shaft 44.

During the last portion of the advance movement of the wire feeding jaws 17, 18, they engage the front end face 50 of the spring-loaded filament wire guide 28 and then push the latter back along the unreeled length of lila-ment wire 7 passing through the wire-receiving opening of the guide so as to uncover or expose the free end of the unreeled filament wire 7' which .at this time is recessed backwardly from the front end face 50 of the guide. The exposed free end of the unreeled filament wire 7l is thereby positioned between the separated wire feeding jaws 17, 18 so as to be gripped thereby upon subsequent closure of the jaws. The guide 28 is supported in a slide block 51 in a position with its wire-receiving aperture centrally aligned with the opening between the separated wire feeding jaws 17, 18. The slide block 51 is horizontally slidable, in a direction radially of the turret 2, within a closely fitting slot or slide ways 52 in the arm 19 of the carriage 22, and it is provided with a horizontally extending guide pin 53 which projects from the front and rear edges of the guide block into corresponding openings 54, 55 in the arm 19 to thereby confine the sliding movement of the guide block to a horizontal direction and prevent the guide block from dropping out of the slot 52. The filament wire guide 28 and its associated support block 51 are pushed back by the advancing wire feeding jaws 17, 18 -against the pressure of a coil spring 56 mounted on the guide pin 53 and compressed between the rear edge of the support block 51 and the rear end wall of the slot 52 in the arm 19.

During the backward displacement of the guide 28 by the advancing jaws 17, 18, the filament wire 7' within the guide is prevented from being moved back along with the guide by a friction brake comprising a pair of opposed friction blocks 57, 58 (Fig. 4) between which the filament wire 7' passes as it is withdrawn from the supply spool 16. The friction blocks 57, 58, one of which (i. e. block 58) is spring pressed toward the other block 57 by a compression coil spring 59, are mounted in a depending arm portion 60 on the support arm 19. The operation of the friction brake blocks 57, 58 to hold the filament wire 7 against backward movement is assisted by the frictional engagement of a leaf spring 61 with the top side or edge of the supply spool 16. The leaf spring 61, which is fastened to the top surface of the arm 19, also serves to prevent overrunning of the spool 16 during the pulling of the wire therefrom by the jaws 17, 18, and to maintain the supply speed 16 in place on the arm 19 by holding the pivot studs 20 of the supply spool down at the bottom of the -stud-receiving slots in the arm 19.

Near the end of the advance movement of the interlocked subslide 26 and main slide 27 the locking pin 33 carried by the main slide 27 s disengaged from the pinreceiving aperture 34 in the subslide 26, thereby freeing the subslide for a slight additional amount of advance movement relative to the main slide 27 sufficient to cause the inclined cam surfaces 29, 30 on the wire feeding jaws 17, 18 to engage the cam portions 31, 32 of the main slide 27 so as t-o contract the jaws 17, 18 to their closed position to thereby grip the free end of the filament wire 7 positioned between the said jaws. The lifting of the locking pin 33 to disengage it from within the aperture 34 in the subslide 26 is effected by the engagement of the upright arm 62 of a bell crank lever 63, pivoted at 64 on the main slide 27, with a stop pin or screw 65 on the carriage 22, thereby causing the lever 63 to pivot and swing its horizontal arm 66 upwardly into engagement with the head 67 of the locking pin 33 so as to lift the latter out of the pin-receiving aperture 34. As soon as the locking pin 33 is lifted clear of the aperture 34 by the lever 63, the main slide 27 is then locked against further advance movement and the subslide 26 advanced a slight additional amount relative to the locked main slide, to effect the closing of the jaws 17 and 18, by the force of a pair of coil springs 68, 69 compressed between shoulders 70 and 71 on the main and subslides 27 and 26. During this slight additional advance movement of the subslide 26, the main slide 27 is locked against further advance movement by the locking of the lever 63 against additional pivotal movement by the stop pin 65, such locking action resulting from the binding of the locking pin 33 in the yoked end 72 of the lever arm 66. To permit the additional advance movement of the subslide 26 relative to the main slide 27 by the force of the springs 68, 69, sufficient clearance or lost motion is provided in the pivotal connection between the operating lever 37 and the roller 38 on the subslide. Thus, as shown in Fig. 5, the narrow upper end or slot portion 73 of the roller-receiving recess 74 in the face of the upper head end 75 of the 'operating lever 37, within which slot portion 73 the roller 38 is located at this time, is made suiciently wide to allow the roller 38 and the associated subslide 26 to be `advanced the necessary distance byvspririgs-68', 69 to effect the closure of the wire feeding jaws 17, 18.

Immediately following the completion of the advance movement of the wire-feeding jaws 17, 18 to their fully advanced position (Fig. to effect the closure thereof and the gripping thereby of the free end of the filament wire 7 passing through the guide 28, the jaws 17, 18 are returned to their retracted position as shown in Fig. 6, through the operation of the operating lever 37 acting on the subslide 26, to withdraw a length of filament wire 7 from the supply spool 16 for the formation thereof into a filament 7 to be mounted on the lamp mount 1. During this return movement of the subslide 26 and associated jaws 17, 18, the coil springs 68, 69 maintain the subslide and main slide 27 in the same relative position to each other as they have when the subslide 26 is in its fully advanced position, thereby maintaining the wirefeeding jaws 17, 18 in their closed wire-gripping position. In their retracted position as shown in Fig. 6, the wirefeedng jaws 17, 18 are located some distance to the outward sideof the mount-engaging jaw plates of the mount-carrying heads 3. Simultaneously with the return of the wire-feeding jaws 17, 18 to their fully retracted position, the wire guiding die or guide 28 is returned, by the action of the coil-spring 56, to its normal advanced position as shown in Fig. 6, as determined by the engagement of the guide-carrying support block 51 with the front end of the slot 52 in the support arm 19. In the said fully advanced position of the wire guide 28, its front face 50 is positioned in a vertical plane located a slight distance (of the order of a few thousandths of an inch) inwardly of the turret 2 relative to the position occupied by the upper or filament-connecting end of the inwardmost leading-in wire 9 of the mount 1 when positioned at the filament mounting station, in order to thereby clear the said upper end of such leading-in wire 9 when the guide 28 is subsequently in its lowered filamentmounting position and then raised (at the conclusion of the filament mounting operation) from its lowered filament-mounting position (Fig. 8) to its upper or filament wire feeding position (Fig. 5).

Following the withdrawal of the filament wire 7 from the supply spool 16 by the retraction of the wire-feeding jaws 17, 18, the portion of the filament wire 7 between the jaws 17, 18 and the wire guide 28 is then formed or bent to an inverted V or hairpin shape and located in proper mounting position relative to the position to be occupied by the leading-in wires 8, 9 of the lamp mount 1 (upon subsequent index to the mounting station) so as t to extend over or bridge the coiled filament 4 previously mounted `on the leading-in wire 5, 6 of the lamp mount. The filament wire forming and positioning operations are both performed by a downward movement in unison of the wire-holding elements of the apparatus (i. e., the wire-holding jaws 17, 18 and the guide 28 and spool 16) which act to carry and bend the filament wire 7 down over a stationary forming member or pin 76 extending from a support arin 77 mounted on a stationary part of the machine. The downward movement in unison of the jaws 17, 18 and the wire guide 28 and the spool 16 is produced by a downward sliding movement of the entire carriage 22 in its guide bracket 24. The lowering of the carriage 22 is effected by a box cam 78 mounted on the auxiliary cani shaft 44 and having a cam groove within which rides a roller 79 mounted on the lower end of the carriage support slide 23. The stationary forming pin 76 extends tangentially of the path of movement of the mount 1 in the head 3, and it is disposed the proper height above the head 3 and intersects the vertical center line of the mount 1 at the filament mounting station so as to be at the exact location of the peak of the inverted V filament 7 when positioned for mounting on the leading-in wires 8, 9 of the lamp mount 1 at the filament mounting station. The forming pin 76 is supported at one end onlyon the support bracket 77 and it projects approximatelyhorizontally 4therefrom in the direction of advance movement of the lamp mount 1 by the mountcarrying head 3 so as to permit unhindered removal or movement of the mounted filament 7 off the forming pin during the ensuing index movement of the mount 1 away from the filament mounting station. To assure the free movement of the filament 7 off the forming pin 76 so as to prevent distortion of the filament, the forming pin is declined or tilted downwardly at a slight angle, for example a degree or two, in the direction of advance movement of the head 3. As shown in Fig. 8, the downward movement in unison of the wire-feeding jaws 17, 18 and the wire guide 28 carries them to positions below that of the upper ends of the leading-in wires 8, 9 of the mount 1 in the head 3 such as to locate the immediately adjacent portions of that part of the filament wire 7' extending between the jaws 17, 18 and guide 28, across and in proper mounting relation to the outwardly fiaring or angled upper ends of the leading-in wires 8, 9 of the mount 1 when the latter is subsequently indexed to the filament mounting station.

At the `outset of the downward movement of the carriage 22 to bend the straight filament wire 7 down over the forming pin 76, the wire-feeding jaws 17, 18 are in their retracted position as shown in Figs. 6 and 7. In such retracted position of the wire-feeding jaws 17, 18, the portion of the n`lament wire 7 extending from the jaws 17, 18 to a point directly over the forming pin 76 is of a length sufficient to form one of the legs of the final formed V filament 7. Accordingly, to prevent any appreciable movement or wiping of the filament wire 7' across the forming pin 76 after the initial engagement of the wire 7 with the forming pin and during the ensuing bending of the wire therearound, the wire-feeding jaws 17, 18 and associated subslide 26 are advanced toward the wire guide 28, following the initial engagement of the filament wire 7' with and during its bending around the forming pin 76, through the required distance and at the necessary rate to maintain the mouth opening of the closed jaws 17, 18 at a fixed distance from the nearest wire-engaging surface of the forming pin 76. This advance movement of the feed jaws 17, 18 during the filament wire bending operation is effected by the engagement of a roller 80 on the rear end of the main slide 27 with an inclined cam track or groove 81 into which the roller 80 is carried during the downward movement of the carriage 22. The inclined cam groove 81 is formed in a stationary plate cam 82 mounted on and upstanding from the base 25 of the filament mounting apparatus. During the downward movement of the carriage 22 to bend the filament wire 7 around the forming pin 76, the roller 38 on the subslide 26 is carried down into the widened lower part 83 ofthe roller-receiving recess 74 in the head portion 75 of the operating lever 37, thereby allowing the roller 38 and associated subslide 26 to be advanced along with the main slide 27 toward the guide 28 during the bending of the filament wire around the forming pin.

Due to the force of the spring 56, the wire-feeding guide 28remains in its fully advanced position, as shown in Figs. 6-8, during the full extent of downward movement of the carriage 22 to bend the filament wire 7' over the forming pin 76. Since, as mentioned previously, tlie front face of the guide 28, when in the said fully advanced position, is disposed in a vertical plane located only a slight distance (i. e., a few thousandths of an inch) inwardly of the turret from the upper end of the leading-in wire 9 of the lamp mount 1 when positioned at the filament mounting station, the length therefore of that portion of the straight filament wire 7' extending from the guide 28 to a point directly above the forming pin '76 is considerably shorter than the length of filament wire required to form the .corresponding leg of the final formed inverted V yfilament 7. Accordingly, an Aadditional amount of filament wire 7 is required to for-m the leg of the V filament between the forming pin 76 and the guide 28. This additional amount of wire 7 is supplied by the withdrawal of additional filament wire from the supply spool 16, the tension in the portion of the filament wire 7 being bent over the forming pin 76 serving to automatically pull the necessary additional amount of filament wire off the supply spool 16 and through the guide 28 during the bending operation.

Concurrently with the downward movement of the carriage 22 to form the inverted V-shaped filament 7 and locate it in position for mounting on the leading-in wires 8, 9 of the lamp mount 1, the turret 2 is indexed to carry the said lamp mount 1 to the filament mounting station. The index of the turret 2 is so timed, however, relative to the operations of the filament forming apparatus as to advance the previously formed lamp mount away from the filament mounting station before the filament wire 7 engages the forming pin 76, thereby preventing interference with the movement of the previously mounted filament 7 off the forming pin 76, and in addition assure the arrival of the succeeding lamp mount 1 at the filament mounting station only after the inverted V-shaped filament 7 has been formed and is already in mounting position at the filament mounting station.l As a result, the leading-in wires 8, 9 of the succeeding lamp mount 1 are brought up against the ends of the inverted V-shaped filament 7 held in the jaws 17, 18 and guide 28 in position for clamping to the said leading-in wires. Such a manner of operation assures against the possibility, such as might occur if the filament 7 were formed and located in mounting position after the index of the mount 1 to the filament mounting station, of the filament wire-feeding jaws 17, 18 or the guide 28 striking against the ends of and distorting the leading-in wires 8, 9 of the mount should they initially be slightly out of alignment or position.

As soon as the lamp mount 1 arrives at the filament mounting station, the ends of the inverted V-shaped portion of the filament wire 7 are fastened or clamped to the upper ends of the leading-in wires 8, 9 of the mount, after which the filament wire is then severed at a point between the guide 28 and the adjacent connection of the filament wire to the leading-in wire 9 of the mount. The fastening or clamping of the filament wire 7', to the leading-in wires 8, 9 and the severing of the filament wire are performed by clamping and severing means C located above the filament wire forming and positioning means F and vertically reciprocable between a raised inoperative position and a lowered clamping and severing position. The clamping and severing means C is mounted on a bracket 85 upstanding from the base 25 of the filament mounting apparatus and straddling the filament wire forming and positioning means F. The clamping means fastens the filament wire 7' to the leading in wires 8, 9 by embedding the filament wire into the softer copper-coated iron (Dumet) wire of which the leading-in wires 8, 9 are composed. The clamping of the filament wire 7 to the leading-in wires 8, 9 is effected by a pair of normally separated U-shaped clamping jaws 86 which are closed against opposite sides of the upper ends of the two leading-in wires 8, 9 and the adjacent ends of the V-shaped filament wire portion 7' lying thereacross. The clamping jaws 86 are U-shaped (Fig. 4) so as to straddle the other pair of leading-in wires 5, 6 of the mount without touching or distorting them when the said jaws are in their closed wire-clamping position. In addition, the clamping jaws 86 are of a size small enough to pass freely between the wire-feeding jaws 17, 18 and the guide 28 (Fig. 8), when the jaws 86 are in their closed wire-clamping position, in order to thereby assure the positive clamping engagement thereof with, and thus the clamping of the upper ends of the leading-in wires 8, 9 to the portions of the filament wire 7 lying thereacross.

The clamping jaws 86 are mounted on the lower ends CFI of a pair of vertically arranged jaw arms or levers 87, 88 which are pivotally mounted on pivot pins 89, extending from the front face of a vertically reciprocable main slide 90, so as to pivot in a vertical plane. The main slide 90 is mounted for vertical reciprocating movement in a vertical guideway 91 on the support bracket 85, and it is continuously urged downwardly by the tension or contraction force of a pair of tension coil springs 92, 92 fastened at their opposite ends to and tensioned between spring posts 93, 94 mounted, respectively, on the main slide 90 and on the guideway portion 91 of the bracket 85. The main slide 90 is provided with a vertical guideway 95 in its front face within which a subslide 96 is vertically reciprocable and held by a cover plate 9'7 fastened to the main slide. The subslide 96 is provided with. a vertically elongated island or stop-lug 98 on its front face which extends into and is vertically movable within a vertically elongated slot 99 formed in the cover plate 97. The clamping jaws 86 and associated jaw arms 87 and 88 are normally maintained in a raised inoperative position entirely above the filament wire forming and positioning means F, so as to be clear of the lamp mount 1 in the heads 3 during the index movement thereof, by the upward pull on the subslide 96 of the piston rod 100 of a two-way acting air cylinder 101, which upward pull is transmitted to the main slide 90 through the engagement of the island projection 98 with the upper end 102 of the slot 99. The air cylinder 101 is mounted on the upper end of the support bracket 85, and the piston rod 100 is connected to the upper end of the subslide 96. The upward pulling force of the piston rod 100 on the subslide 96 holds the said subslide and the main slide 90 in their upper limiting position against the downward pull of the tension coil springs 92 on the main slide.

The jaw arms 87, 88 are provided at their upper ends with cam follower rollers 103 which are adapted to engage and ride on a wedge cam 104 fastened to the island projection 98 on the subslide 96. The cam follower rollers 103 are held in engagement with the wedge cam 104 at all times by the contractive force of a. coil spring 105 vconnected and tensioned between spring posts 106 on the upper portions of the jaw arms 87, 88. In the upper or inoperative position of the clamping and severing means C, as well as during the lowering thereof to its operative clamping position, the clamping jaws 86 are held in an open inoperative position by the spring 105, with the cam follower rollers 103 in engagement with the narrow lower end or low portion 107 of the wedge cam 104.

The operation of the filament wire clamping and severing means C is effected by the downward stroke of the piston rod 100 of the air cylinder 101 which acts to lower the clamping and severing means C from its raised inoperative position (Figs. l and 2) to its lowered operative position wherein the filament clamping jaws 86 are disposed in the proper elevational position for engaging and clamping together the upper ends of the lead-in wires 8, 9 and the ends of the filament wire 7 lying thereacross, when the jaw arms 87, 88 are subsequently pivoted so as to close the jaws 86. The operation of the air cylinder 101 is controlled by a valve 108 (Fig. 1) mounted on the hase 25 of the filament mounting apparatus and operated by a cam 189 which is mounted on the main drive shaft 4S and engages the reciprocable operating member 110 of the valve 108. During the downward stroke of the piston rod 100 and the associated subslide 96, the main slide 90 is moved down in unison with the subslide through the combined action of the tension coil springs 92 and a yieldable interlock which is provided between the two slides and which consists of a spring-loaded locking pin 111 reciprocable within the main slide 90 and having a rounded end fitting into a conically shaped pinreceiving recess or notch 112 in the subslide 96. A compression coil spring 113 located behind the locking pin 111 holds the pin within the recess 112 so as to lock the two slides 90 and 96 together against vertical displacement relative to one another except when excessive force is applied to the two slides tending to displace them vertically. Under such excessive force conditions, the locking pin 111 will be pushed back out of the recess 112 by virtue of the rounded end of the pin and the conical shape of the recess, thereby allowing the two slides 90 and 96 to be displaced vertically relative to one another.

The downward movement of the main slide 90 along with the subslide 96, on the downward stroke of the piston rod 100, continues until a stop shoulder or ear 114 on the main slide 90 strikes against the end of a stop screw 115 mounted on a block 116 on the front face of the guideway portion 91 of the support bracket 85. The engagement of the stop shoulder 114 with the stop screw 115 thus locates the main slide 90 and the associated clamping jaws 86 in their lowered or operative clamping position. The continued downward movement of the piston rod 100 and associated subslide 96, after the stoppage of the main slide 90 in its lowermost position by the interengaged stops 114, 115, then forces the locking pin 111 out of the recess 112 and effects a further independent downward movement or displacement of the subslide 96 relative to the main slide 90. During this independent downward movement of the subslide 96 relative to the main slide 90, the cam-engaging rollers 103 on the jaw arms S7, 88 ride up the inclined rise or wedge portions 17 of the cam 104 and onto the wide upper end or high portion 118 thereof, thereby pivoting the jaw arms S7, 88 and the clamping jaws S6 to their closed position against the upperv ends of the leading-in wires S, 9 and the filament wire 7 lying thereacross and effecting the clamping together of the leading-in wires and the filament wire.

The very last portion of the downward movement or overtravel of the subslide 96 relative to the main slide 90 following the closure of the clamping jaws 86 by the riding of the cam-engaging rollers 103 onto the widened upper end or high portion 118 of the cam 104, operates to actaute the severing means of the apparatus so as to sever the inverted V-shaped portion of the filament wire 7' (which is now clamped to the leading-in wires 8, 9 of the mount) from the remainder of the supply of filament wire 7 extending from the supply spool 16 thereof. The severing of the filament wire 7 is performed by a sharp edged knife 120 carried by the lower end of the lever 121 which is pivotally mounted on a pivot pin 122 on the front face of the jaw arm 87, for independent pivotal movement relative thereto in a vertical plane. As shown in Fig. 2, the lever 121 and the associated cutting knife 120 are normally held in a retracted pivotal position on the jaw arm 87, with the cutting edge 123 of the knife located a short distance back from the clamping faces of the clamping jaws 86, by the force of a torsion spring 124 mounted on a pin 12S on the jaw arm 87 and bearing at one end against the upper end of the lever 121 and at its other end against the spring post 106 on the jaw arm S7. The retracted pivotal position of the cutting knife 120 and the lever 121 on which it is mounted is determined by the engagement of the lever with a stop screw 126 mounted on the jaw arm 87 at the lower end thereof. The lever 121 is pivoted to carry the cutting knife 120 thereon against and through the filament wire 7 so as to sever it, by the engagement of the end of a screw 127 on the upper end of the lever 121 which the inclined cam surface 128 of a cam 129 mounted on the front face of the wedge cam 104, which engagement occurs during the very last portion of the overtravel of the subslide 96 and associated wedge cam 104 relative to the main slide 90 during the downward stroke of the piston rod 100. The cutting edge 123 of the cutting knife 120 is arranged to enter between the front face S of the wire guide and theleading-in wire 9 just below the upper end thereof, and as close as possible to the clamping jaws 86, when the lever 121 is pivoted to carry the cutting knife 120 against and through the filament wire 7', in

order to thereby assure the severing of the filament wire 'l' as close as practicable to the leading-in wire 9. To enable the cutting edge 123 of the knife 120 to thus enter between the leading-in wire 9 and the front face 50 of the guide 28, and in view of the very minute clearance space therebetween, the cutting knife is arranged to engage the front end face 50 of the guide 28 and push the latter back a slight distance away from the lamp mount 1. To this end, the front side of the cutting knife 120, extending back from the cutting edge 123 thereof, is beveled as indicated at 130 in Fig. 2, and the front end face 50 of the wire guide 28 is correspondingly beveled as indicated at 131 in Fig. 4. During the wirescvering swing movement of the cutting knife 120, the beveled surface 130 thereof strikes against the beveled front surface 131 of the gui-de 28 and, because of the angularity of these beveled surfaces to the plane of swing movement of the cutting knife, acts to push the wire guide 23 back the required distance to allow the cutting knife to pass between the leading-in wire 9 of the mount and the front end face 50 of the wire guide 28.

Following the completion of the filament wire mounting and severing operation, but while the clamping jaws 86 are still closed against the upper ends of the leadingin wires 8, 9 and the ends of the filament 7, the subslide 26 carrying the wire feeding jaws 17, 1S is retracted to open the jaws 17, 18 so as to release the grip thereof on the end of the filament 7 connected to the leading-in wire 8 of the lamp mount 1. The retractivc movement of the subslide 26 and the jaws 17, 18 to effeet the opening of the latter is performed while the clamping jaws E6 are still closed against the leadingin wires 8, 9, and the ends of the filament 7, in order to thereby prevent breakage of the filament wire, at the connection thereof to the leading-in wire 3, by the retractive movement of the jaws 17, 18. The retraction of the subslide 26 to open the wire-feeding jaws 17, 18 is effected through the actuation of the operating level' 37 by the earn 43 and through the engagement of the front wall of the widened recess 33 in the head 75 of the operating lever with the roller 33 on the subslide 25. inasmuch as the main slide 27 is locked against refractive movement at this time by the engagement of the roller 30 thereon within the inclined cam slot 81 of the stationary cam 32, the retraction of the subslide 26 by the operating lever 37 therefore serves to pull the inclined cam surfaces 29, 30 of the wire-feeding jaws 17, 1S back away from the inclined cam portions 31, 32 of the main slide 27, thereby allowing the Wire-feeding jaws 17, 18 to spring outward to their open position. In addition to effecting the opening of the wire-feeding jaws 17, 18 to release their grip on the end of the filament wire 7, the retraction of the subslide 26 pulls the wire-feeding jaws 17, 18 back. away from the end of the filament l connected to the leading-in wire 8 so as to be clear of the said filament end and also displaces the subslide 26 backwardly relative to the main slide 27 a sufficient distance to allow the locking pin 33 to drop down into the pocket 34 in the subslide, thereby locking the subslide 26 and main slide 27 in their original position relative lto ea-ch other with the wire-feeding jaws 17 18 in their open position.

As soon as the Wire-feeding jaws 17, 18 have thus been opened to release the end of the filament 7 and retracted so as to clear the said filament end. thc clamping and severing means C is then returned to its raised inoperative position to carry it clear of the lamp mount 1 and the filament forming mechanism F by the upward stroke of the piston rod 100 which is brought about by the actuation of the control valve 108 by cam 109 to supply compressed air to the lower end of the air cylinder while `venting the upper end thereof. Because of the downward pull of the springs 92 on the main slide 90 of the clamping and severing means C the rst por- 13 tion of' the upward movement of the piston rod 100 corresponding to the overtravel of the subslide 96 relative to the main slide 90 0n the immediately previous downstroke of the piston rod, is effective to raise the subslide 96 alone relative to the main slide '90, the latter meanwhile being held in its lowered position by the springs 92. This upward movement of the subslide 96 relative to the main slide 90 then operates to first withdraw the cam 129 from engagement with the stop screw 127 on the knife-carrying lever 121, thereby allowing the torsion spring 124 to swing the lever 121 and its associated cutter knife 120 back to their inoperative position as determined by the engagement of the lever 121 with the stop 126, and then to withdraw the widened or Wedge portion 117 of the cam 104 from engagement with the rollers 103 on the jaw arms 87, 88 so as to allow the spring 105 to swing the jaw arms 87, 88 and associated clamping jaws 86 to their open position. The continued upward movement of the subslide 96 by the piston rod litt), following the return of the cutting knife 120` and the clamping jaws 86 to their retracted o-r open position, causes the camsupporting island projection 98`on the subslide '96 to engage the upper end 102 of the slot 99 in the cover plate 97 of the main slide 90 and thus raise the main slide 90 along with the subslide until they reach their upper inoperative position as determined by the upward limiting position of the piston rod 106. At the time the projection- 98 on the subslide 96 reengages the end 102 of the slot 99 in the main slide 96, during the upward movement of the subslide 96 by the piston rod 100, the spring-loaded locking pin 111 is forced by the spring 113 back into the recess 112 in the subslide, thereby locking the subslide and the main slide against relative vertical displacement.

As soon as the clamping and severing means C has been thus raised to its upper inoperative position so as to be clear of the filament wire feeding and positioning mechanism F, comprising the wire feeding jaws 17, 18, the wire guide 28 and the supply spool 16 which are all mounted on the carriage 22, the latter is raised to its upper or wire-feeding position by the action of the cam 73 on the roller 79 carried by the carriage support slide 23. During the upward movement of the carriage 22, the interlocked slides 26, 27 are moved backwardly to their original retracted position by `virtue of the backward inclination of the Cam slot 81 of cam 82 which causes the roller 80 riding therein to be moved backwardly when the carriage 22 is raised. Since the subslide 26 and main slide 27 move back in unison during the upward return movement of the carriage 22 by reason of the said slides being interlocked at such time by the locking pin 33, the roller 38 on the subslide 26 is therefore also carried backwardly so as to reenter and be positioned within the narrow upper end or slot portion 73 of the recess 74 in the head portion 75 of the operating lever 37. The return of the carriage 22 to its upper position completes the full cycle of operation of the filament mounting apparatus of the invention and thus places the parts thereof in position for the start of the next cycle of operation.

Although a preferred embodiment of our invention has been disclosed, it will be understood that the invention is not to be limited to the specific construction and arrangement of parts shown, but that they may be widely modified wtihin the spirit and scope of our invention as defined by the appended claims.

What we claimas new and desire to secure by Letters Patent of the United States is:

l. Apparatus for mounting a filament upon a pair of leading-in wires of a lamp mount, comprising a head for supporting the mount at a filament mounting station, filament forming mechanism at said station comprising filament wire supply means located to one side of said head and including wire-guiding means having a wire-receiving opening through which the filament wire extends from the.

said supply thereof, a pair of feed jaws located at the otherside of said head, means mounting said feed jaws for movement toward and away from said wire-guiding means to grip the end of the filament wire passing through said guiding means and withdraw a length of said wire from said supply means and dispose it across the head, a stationary forming pin at said station extending across said head in a direction normal to the path of movement of said feed jaw-s and located between the said path and said head, means mounting jaws and wire supply means for movement in unison toward said head to bend the Withdrawn filament wire around said forming pin into hairpin shape and arrange it in mounting position at said station relative to a mount when properly supported in a head at -said station, clamping and severing means located at said station and comprising clamping jaws, jaw-closing means coacting with said clamping jaws to close them so as to clamp the ends of the hairpin shaped portion of the filament wire to the ends of the leading-in wires of the mount at said station, a movable cutter knife, knife-actuating means coacting with said cutter-knife to actuate it so as to thereafter sever the portion of the lament wire connected to the leading-in wires from the remainder of the said supply thereof, operating means coacting with said feed jaws to open and retract them so as to release and clear the end of `the filament wire while the said clamping jaws are still closed against the ends of the leading-in wires and the ends of the filament wire portion connected thereto, and actuating means operatively connected with said filament forming mechanism, said operating means and with said ja -closing and knife-actuating means for actuating them in proper time relation.

2. Apparatus for mounting a filament upon a pair of leading-in wires of a lamp mount, comprising a carrier having a plurality of heads each arranged to support and advance a mount along a path of travel to a work station, filament forming and positioning mechanism at said station comprising a wire guiding die mounted on one side of said path of travel and having an opening for receiving the free end of a continuous supply of filament wire, feed jaws located on the other side of said path of travel opposite said die, means mounting said feed jaws for reciprocating movement toward and away from said die to grip the free end of the filament wire therein and pull a length thereof through said die and position said wire length across said path of travel, operating means coacting with said feed jaws to open and close them, a forming member located at said station in a position between a head at said station and the said die and feed jaws when in their initial wire-feeding position, means mounting said feed jaws and die for bodily movement toward the head to bend the said wire length around the said forming member into the final shape of the filament and to dispose the shaped wire length in position for mounting on a lamp mount when properly supported in a head at said station, fastening means at said station for attaching the ends of the said positioned wire length to the ends of the leading-in wires of a lamp mount at said station, cutting means located at said station for severing the said attached wire length from the remainder of the supply of filament wire at a point between the said guide and the adjacent leading-in wire of the mount, and actuating means connected with said filament forming and positioning means, said operating means and with said fastening and cutter means for actuating them in proper time relation.

3. Apparatus as specified in claim 2 and comprising, in addition, means for indexing said carrier -in proper time relation to the actuation of the said filament forming and positioning mechanism and the said fastening and cutter means by said actuating means so as to index a head at said work station away therefrom before the engagement of the said wire length with said vforming member and to carry the next succeeding head into position at said work station after the said wire length has been formed to its final filament shape and located in mounting position at said station by Mthe said filament forming and positioning mechanism.

4. Apparatus as specified in claim 2 and comprising, in addition, means for moving said feed jaws toward said die, during 'the said bodily movement of said filament forming and positioning mechanism toward said head, to maintain the wire-receiving mouth opening of said feed jaws at a uniform distance from the nearest wire-engaging surface of said forming member during the bending of the said wire length therearound.

5. Apparatus for mounting a filament upon a pair of leading-in wires of a lamp mount comprising a carrier having a plurality of heads each arranged to support and advance a mount along a path of travel to a work station, filament forming and positioning mechanism at said station comprising a wire-guiding die mounted on one side of said path of travel Vfor movement transversely thereof and away from a forward limiting position and having an opening for receiving the free end of a continuous supply of filament wire, slide 4means mounted on the other side of said path of travel and provided with normally open feed jaws disposed in opposed relation to said die, means mounting said slide means for reciprocating movement toward and away from said die, operating means coacting with said slide means and feed jaws to first advance said slide means toward said die to engage and displace it a slight distance backwardly from its said forward limiting position so as to expose the free end of the filament wire therein and position it between the open feed jaws on said slide means andthen close the said feed jaws so as to grip the free end of the filament wire located therebetween, and to then move said slide means back away from said die to draw a length'of filao ment wire therethrough and position it across said path of travel, means coacting with said die for returning it to its said forward limiting position, carriage means mounting said filament forming and positioning mechanism for bodily movement toward the head to dispose the said wire length in position for mounting on a lamp mount when properly supported in a head at said station, fastening means located at said station for attaching the ends of the said positioned wire length to the ends of the leading-in wires of the lamp mount, cutting means located at said station for severing the said attached wire length from the remainder of the supply of filament wire at a point between the said die and the adjacent leadingin wire of the mount, a movable member mounting said fastening and cutting means for reciprocating movement toward and away from an advanced operative position relative to said filament forming and positioning mechanism in which they are located in operative fastening and severing relation to the said positioned wire length, and actuating means operatively connected with said operating means and with said filament forming and positioning means, said slide means and movable member, and said fastening and cutting means for actuating them in proper time relation.

6. Apparatus for mounting a filament upon a pair of leading-in wires of a lamp mount, comprising a carrier having a plurality of heads each arranged to support and advance a mount along a path of travel to a work station, filament forming and positioning mechanism at said station comprising a wire-guiding die mounted on one side of said path of travel for movement transversely thereof and away from a forward limiting position thcreadjacent7 said die having an opening for receiving the free end of a continuous supply of filament wire, spring means yieldingly holding said die against backward displacement from its said forward limiting position, slide means mounted on the other side of said path of travel and provided with normally open feed jaws disposed in opposed relation to said die, means mounting said slide means for reciprocating movement toward and away from said die, operating means coacting with said slide means to first advance the said slide means toward said die to cause the feed jaws thereof to engage and displace the die a slight distance backwardly from its said forward limiting position so as to expose the free end of the filament wire therein and position it between the open feed jaws and then close the said feed jaws so as to grip the free end of the filament wire located therebetween, and to then move said slide means back away from said die to draw a length of filament wire therethrough and position it across the said path of travel at the said work station, carriage means mounting said filament forming and positioning mechanism for bodily movement toward the head to dispose the said wire length in position for mounting on a lamp mount when properly supported in a head at said station, fastening means located at said station for attaching the ends of the said positioned wire length to the ends of the leading-in wires of the lamp mount, cutting means comprising a knife movable transversely of the said length of filament wire and engageable with the front end of said die to displace the latter a slight distance backwardly so as to permit passage of the knife between the front end of said die and the adjacent leading-in wire of the mount to sever the said wire length from the remainder of the supply of filament wire, a movable member mounting said fastening and cutting means for movement toward and away from an advanced operative position relative to said filament forming and positioning mechanism in which they are located in operative fastening and severing relation to the said positioned wire length, and actuating means operatively connected with the said operating means, the said filament forming and positioning means, and with said slide means and movable member and with said fastening and cutter means for actuating them in proper time relation.

7. Apparatus as specified in claim 5 and comprising, in addition, a friction brake engaging the filament wire at a point between the said supply thereof and the said die to prevent backward movement of the filament wire in the die during the backward -displacement -of the die by said slide means.

8. Apparatus for mounting a filament upon a pair of leading-in wires of a lamp mount, comprising a carrier having a plurality of heads each arranged to support a mount with its leading-in wires upstanding and to advance the mount along a path of travel to a work station, filament forming and positioning mechanism at said station comprising a vertically movable carriage located on one side of said path of travel and having an arm extending over the said path of travel, filament wire supply means mounted on said arm at the other side of said path of travel, a wire-guiding die mounted on said arm at the said other side of the path of travel for horizontal reciprocating movement transversely thereof, said die having a wire-receiving opening through which the filament wire extends from the saidr supply thereof, resilient means yieldingly holding said die against backward ydisplacement away from the said path of travel, feed jaws slidably mounted on said carriage in opposed relation to said die for horizontal reciprocating movement transversely of said path of travel and towards and away from said die, jaw operating means coacting with said feed jaws to first advance them toward said die to cause the feed jaws to engage and displace the die a slight distance backwardly so as to expose the free end of the filament wire therein and position it between the open feed jaws and then close'v the said'feed jaws so as ,to grip the free end of the filament wire located therebetween, and to then retract said feed jaws away from said die to draw a length of filament wire therethrough and position it across the said path of travel and above a head when properly positioned at the said work station,'a stationary forming pin located at said station and provided with support means at one end only and extending therefrom approximately horizontally and across and directly above a head at said station in the direction of advance movement of the heads to and from said station, carriage operating means coacting with the said carriage to move it downwardly to bend the said wire length over the said forming pin and into inverted V shape and to dispose the shaped wire length in position for mounting on a lamp mount when properly supported in a head at said station, fastening means located at said station and operable to attach the ends of said positioned wire length to the ends of the leading-in wires of the lamp mount, cutting means located at said station and operable to then sever the said attached wire length from the remainderof the supply of filament wire at a point between the said die and the adjacent leadingin wire of the mount, and actuating means operatively connected with said filament forming and positioning mechanism, said jaw operating means and with said carriage operating means and said fastening and cutter means for actuating them in proper time relation.

9. Apparatus as specied in claim 8 and comprising, in addition, means for indexing said carrier in proper time relation to the actuation of the said filament forming and positioning mechanism and the said fastening and cutter means by `said actuating means so as to index a head at said work station away therefrom before the engagement of the said wire length with said forming pin and to carry the next succeeding head into position at said work station after the said wire length has been formed to its nal filament shape and located in mounting position at said station by the said filament forming and positioning mechanism.

10. Apparatus as speciiied in claim 8 wherein the said cutting means comprises a knife movable transversely of the said length of filament wire and engageable with the front end of said die to displace the latter aslight distance backwardly so as to permit passage of the knife between the front end of said die and the adjacent leading-in wire of the mount to sever said wire.

l1. In combination, filament wire feeding mechanism including wire-feeding jaws and a wire-guiding die for supporting and locating a portion of the length of a supply of iilament wire extending through said die in position for mounting on the upper ends of the leading-in wires of a lamp mount supported in a head at a work station, and apparatus for clamping the said positioned portion of the filament wire to the leading-in wires of the mount and then severing the clamped portion of the lilament wire from the remainder of the supply thereof, said A apparatus comprising support means, a main slide vertically reciprocable on said support means and disposed above the head at said station, spring means normally urging said main slide downwardly, a subslide vertically reciprocable o-n said main slide, clamping means comprising a pair of vertically arranged jaw arms pivotally mounted on said main slide to pivot in a vertical plane and provided at their lower ends with opposed clamping jaws, cutting means comprising a vertically arranged lever pivotally mounted on said main slide to pivot in a vertical plane and provided at its lower end with a cutting knife, actuating means connected to said subslide to vertically reciprocate it through a predetermined stroke, stop means on said support means engageable with said main slide to limit the downward movement of said main slide to a distance less than the full downward stroke of said subslide by said actuating means and to locate the said clamping and cutting means in operative position relative to the ilament wire portion to be clamped and severed, abutment shoulders on said main and subslide engageable with each other on the upward stroke of said subslide to carry the main slide upwardly along with the said subslide, cam means on said subslide engageable with the upper ends of said jaw arms, during the downward overtravel movement of said subslide relative to the main slide, to pivot the jaw arms so as to close the clamping jaws thereof, and other cam means on said subslide engageable with the upper end of said lever, during the last portion of the downward over-travel movement of said subslide relative to said main slide, to pivot said lever so as to move the cutting knife thereon through its cutting stroke into engagement with and across the front face of said die to thereby sever the iilament wire extending therefrom.

12. Apparatus as specified in claim 11 wherein the said lever of said cutting means is pivotally mounted on one of said jaw arms for its said pivotal movement in a vertical plane and wherein resilient means are provided for yieidingly holding said lever in a retracted inoperative position with the cutting edge of its cutting knife located a slight distance backwardly of the clamping jaw face on said one jaw arm.

References Cited in the file of this patent UNITED STATES PATENTS 1,728,048 Flaws Sept. l0, 1929 2,085,578 Flaws .Tune 29, 1937 2,114,844 Krause Apr. 19, 1938 2,297,950 Flaws Oct. 6, 1942 2,327,033 Flaws n Aug. 17, 1943 2,667,189 Flaws Jan. 26, 1954

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