US1526459A - Sewing-machine attachment - Google Patents

Description

Feb. 17. 1925. 1,526,459

F. M. CARD SEWING MACHINE ATTACHMENT Filed Oct. 6, 1922 711-! 5 1 a in 1 1 N I INVENTOR W1TNESSES= .3 fi'edcric M6192 Malaw I.

% BY WW l V ATTORNEY it Waterman Patented Feb. 17, 1925.

UNITED STATES FREDERIC M. CARD, OF BRIDGEPORT, CONNECTICUT. A SEEI EGNOH iiiil l FACTURING COMPANY, OF ELIZABETH. NEW JEBEEY, A. COEZPQBLAKHHNTLE JERSEY.

PATENT E ATTAHHMEITT.

Application filed October 6, 1922. Serial No.

To (dl whom it may (JOILCGWLZ Be it known that I, FREDERIC M. CARD, a citizen of the United States, residing at lhidueport, in the county of Fairfield and 5 State of Connecticut, have invented certain new and useful Improvements in Sewingliillachiue Attaclunents, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in work-severing mechanisms for sewing machines adapted to make the so-called open-work, spoke stitch and henistitch seams, whereby the cross-bars of the seams may be severed to produce what is known as picot-edginge VVork-severing mechanisms of this character are commonly termed picotcdging attachments.

Picot-edging' attachments of prior construction may be divided into two classes,

in one of which the lower or non-actuated blade is supported by a bracket sustained by the presser-bar of the sewing machine, as disclosed for instance in the United States patent to C. M. Aberorombie, No. 1,098,003,

May 26, 191.4, and in the other of which the min-actuated blade is secured upon the cloth-plate or throat-plate of the machine, as disclosed for instance in the United States patent to W. Hirk, No. 1,392.872, October 4t, 1921. During the feeding of the Work, the feed-dog is projected above the machine tl'iroat-plate, whereby the presser-bar is slightly lifted. Consequently, in the first class of device/sit is essential to provide means for preventing the work from being fed under the lower blade which in the natural course would follow the movements of the presser-bar. Avariety of devices have been employed'to this end, all of which complicate the construction and operation of the attachment. In constructions wherein the non-actuated blade is secured upon the machine throat-plate, a difficulty is imme diately apparent in the turning of sharp corners or curvesin the Work. Furthermore, when it is desired to change from picotedging to straight hemstitching, it is necessary to stop the machine and detach the parts to facilitate handling of the work and prevent severing thereof.

' The present invention has for its object to provide a picot-edging attachment of under various conditions oi titlfii'liiitui and capable of being at will shiltcdiuto an iueil tective position.

To the attainment oi the objct: invention. the cutting: lilo l are supported upon a fulcrum ml both blades and sustained. h adjustablv secured upon a rip'i overhanging arm of the machine. actuated blade is secured movement upon its pivotal operative and inoperative means of a shittingand seen operating in a cam-slot provi c blade-sup iorting bracket In i opt. tire position the cutting end oi? the blade is pret- W erably disposed in contact with the throat plate and in its inoperative portion end of the blade is shifted about is pivotal support into a. position above the ti-ea" face of the presser-ttoot. The blade is linked to the usual pierccr-ac "i innf rocleshai t for actuation thereh two blades being yieldingly inai" shearing relationship by a sprii against the head of a screw threaded the iulcui'm'stud tor the purpose oi. permit-- ting ready removal of the blades imresharpeuing purposes.

In the accompanying; drawings, Fig. i is a front end elevation oi? the heao portion oi an open-work stitching machine to which the present improved attacluncnt ha" u applied, the left presser-ttoot b l A. away to better illustratothe cut Fig. 2 is a rear side elevation oi? the machine W head. Fig. 3 is view oi the t: h from the side opposite to the." Fig. 1, with the riuht pro away. Fig. 4 is a top plan vie of the trininningr kuivcsillr 7 position with respect the p throat-plate. Fig. 5 is a d view of the blade supportine substantially on. the line {c- 7L (i is a detail tional view 01 the i actuating blade shittinp; and socu i screw, substantially on the line y 2 Fig. 3.

Referring to the drawin ts the improvement is shown embed commerically well known sewi adapted to make an open-work i machine includes a cloth-plate l, a 1' l pirsen plate 2, av feed-dog 3, together with the usual overhanging arm terminating in the head a. J ournaled in the overhanging arm is the usual rotary actuating shaft 5 carrying the crank-pin 6 connected by means of the link T with the needle-bar 8 mounted for vertical reciprocatory movements in the. head l. The needle-bar carries two needles, as 9, (only one of which is shown) arranged in a line transverse to the direction of seam-formation and each adapted to be laterally vib'ated by upwardly extending rods, as 10, (only one of which is slmwn). The rods 10 are adapted to be actuat "cl inthe usual manner in properly timed relation with respect to the movements oi the teeddog 3 to form an open-work seam. The needle-bar 8 also carries for endwise re ciprocation the front piercer ll having its usual function.

Also suitably journaled in the overhanging arm is the rock-shaft 12 adapted to he actuated from the shaft :3 and connected by means of an arm 13 with the pier: er-bar l-ljournaled for endwise movement in the head l. The piercer-bar carries the usual piercer 15 for cooperation with the. needles in the formation of an open-work seam. A spring-pressed presser-l ar 16 is mounted for endwise moven'ient in the head t and is provided at its lower end with left and right presser- leet 17 and 18. The presser-bar l6 is under the action of a coiled spring 19 interposed between an adjustable bushing 20 and a collar 21 secured upon the presserbar by means of a set-screw The collar 2i is provided with divergent litter-lugs 2-3 and Q l, the lug 23 being disposed in the path of movement of the hand liiterlcver Q5,acting upon said lug through the intermediary of the yielding wear-plate The lug 2% projects into a slot 27 provided in a guide-bar 28 secured for vertical adjust ment in suitable apertured lugs on the machine head by means of a screw 29. The interengagement of the lug 24- and the walls of the slot 27 prevents axial rotation cl the presser-bar and at the same time said lug is subject to the action of the usual kneerontrolled lever 30, of which the free end projects into the slot 27. I

In the present construction the guidebar 28 is lengthened to form a support. for the cutting blades of the picot-edging attaclnn ent. To this end there is clamped upon the lower end of the bar 28, a collar 31 by means of a screw 32. Adjustably secured upon the collar 31 by means of screws as is the laterally projecting shank of a depending bracket 35. The lower end of this bracket 35 is formed with an aperture 36 entered by a fulcruin-stiul ST and affording a pivotal-support for the cutting blades 38 and '39. These blades are maintained in shearing relationship by means of a coiled spring 40 interposed between the blade 39 and the head of a screw 4-1 threaded into the fulcrum-stud 37. The blade 38 is non-actuated in the severing action and in operative position its cutting end 4-2 is pretcrably disposed in contact with the throatplate 2, whereby the work to be severed is compelled to ride up on the blade. This position of the cutting blade is rigidly i'naintained in the following manner. The rear end of the blade 38 is provided with an elongated slot l3 entered by a pin 1%, pro-- jecting from the head of a bolt 46, enter" ing an elongated slot 47 provided in the bracket 35. The bolt l6 projects throu "b the slot L7 and threaded upon its outer end is a securing nut 48 between which and the bracket 35 is interposed a washer ll). lVhen the nut 48 is slightly loosened, the bolt li'; may be shifted by manipulation of the nut le, in both of the slots 4-3 and lit Inasmuch as the bracket 35 and consequently the slot it? is rigid, the shifting ol' the bolt to its extreme forward position depresses the end oi the blade 38 into contact with the threat plate, owing to the angular relationship of the slots l3 and 47. On the contrary, when the bolt &6 is shifted rearwardly, the cutting end d2 of the blade 38 is raised above the tread-surfaces of the presser-teet l7, 18. whereby the work is free to pass under said blade. The blade 38 is rigidly secured in both of these positions by tightening the out 418, it being apparent that by reason ol' the construction described only a very sli 'h. turn oi" the nut 48 is essential to permit shifting of the bolt. Furthermore, this shil'ing may occur at any time at the will of the operator without interfering with the operation of the machine. The described construction of pivotal support fo the blades 38, 39 permits ready detachment of the blades from the machine liOl resharpening or other purposes without interfering with the PIOSSOY-YEOO'L or other operative parts.

The movable blade 39 is provided at its forward end with a cutting edge 50 for coaction with the cutting edge 42 and is connected at its rearward end by means of apivot-screw 51 with a link 52, pi otally connectcd at its upper end to a collar secured upon the piercer rock-shaft 12 by means ot a screw 54. It is apparent that by means ol' this construction the cutting blade 39 will be actuated in unison with the piercer and that by reason of the disposition of the blades rearward of the needle-aperture in the throat-plate and in alinement with a vertical plane through said aperture, the cross-bars of the open-work seam will be severed to produce what is known as picot edging. The end 42 of the non-actuated blade is disposed directly in the rear of the needle-aperture and as only the point of this blade rests upon the throat-plate, it is clear that very sharp turns may be made without interfering with the picoting operation.

Having thus set forth the nature of the invention, what I claim herein is l. The combination in a sewing machine including a throat-plate having aneedle aperture, an overhanging arm, a presserfoot, and stitch-forming and feeding mechanism for making an open-work seam, of coacting blades having their cutting edges disposed rearwardly of the throat-plate ncedle-aperture and coacting in substantially a vertical plane through said needle-aperture, means upon said overhanging arm for rigidly supporting one of said blades, and means for actuating the other blade to sever the cross-bars of the open-work seam.

2. The combination in a sewing machine including a throat-plate having a needleaperture, an overhanging arm, a pressertloot, and stitch-forming and feeding mechanism for making an open-work seam. of coacting blades having their cutting edges disposed rearwardly of the throat-plate needle-aperture and coacting in substantiallv :1 vertical plane through said needle aperture, means upon said overhanging arm for rigidly supporting one of said blades, a pivotal support for the other blade, and means for actuating the pivotally supported blade to sever the cross-bars ot' the openwork seam.

3. The combination in a sewing machine including a throat-plate having a needleaperture, an overhanging arm, a presserfoot, and stitch-forming and feeding mechanism for making an open-work seam, of coacting blades having their cutting edges disposed rearwardly of the throat-plate needle-aperture and coacting in substantially a vertical plane through said needleaperture, means upon said overhanging arm tor rigidly supporting one of said blades in both operative and inoperative positions, a pivotal support for the other blade, and means for actuating the pivotally supported blade to sever the cross-bars of the openwork seam.

4;. The combination in a sewing machine including a throat-plate having a needle aperture, an overhanging arm, a presserfoot, and stitclrforming and feeding mechanism for making an open-work seam, of. coacting blades having their cutting edges disposed rearwardly of the throat-plate needle-aperture and coacting in substantially a vertical plane through said needleaperture. means upon said overhanging arm for rigidly supporting one of said blades, means for actuating the other blade to sever the cross-bars of the open-work seam, and means for at will rendering said movable blade ineflt'ective.

5. In a sewing machine, the combination with stitch-forming and feeding mechanism, and a throat-plate having a needleapertijire, ot work-severing mechanism comprising a stationary blade having its cut ting edge disposed in operative position rearwardly of said needle-aperture and in substantial alinement therewith in the direction of iced, a movable blade coact-ing with said stationary blade, means for actuating said movable blade, a bracket rigidly sustaining said stationary blade in op erative position, and means for at will shitting said stationary blade into and out of rigid operative position during the operation of the machine.

6. in a sewing machine, the combination with stitclvilorming and feeding mechanism, and a throat-plate having a needle-aperture, ott work-severing mechanism comprising a stationary blade ha \*ing its cutting edge dis posed in operative position rearwardly of said. needle-aperture and in substantial alinement therewith in the direction oi feed,

a pivotal support for said stationary blade above the work side of said throat-plate, means for securing the stationary blade against incidental movement upon its pivotal support during the operation of the machine, a movable blade disposed above the work site of? the throat-plate for coaction with the stationary blade in the severing ot the work, and means for actuating said movable blade.

7. In a sewing machine, the combination with stitch-forming and feeding mechanism, and a throat-plate having a needle-aperture, ot work-severing niecl'iaiiisu'i comprising a stationary blade having its cutting edge disposed in operative position rcarwardly oi said needle-aperture and in substantial alinement therewith in the direction ol feed, a pivotal support for said stationary blade, means For securing the stationary blade against incidental moven'ient upon its pivotal support during the operation of the machine and permitting the shifting at will of said stationary blade upon its pivotal supportinto operative and inoperative positions during the operation of the machine, a pivotally supported movable blade coacting with said stationary blade in the severing operation, and means :For actuating said nu *able blade.

8. In a sewing machine, the combination with stitch-forming and feeding mechanism,

and a throat-plate having a needleapertnre, of work-severing mechanism comprising coacting blades having their cutting edges disposed. in operative position rearwardly of said needle-aperture and in substantial alinement therewith in the direction of feed, a pivotal support common to both of said blades, means for rigidly securing one of said pivotally supported blades against incidental movement during the severing operation, and means for actuating the other of said blades ,upon its pivotal support.

9. In a sewing machine, the combination with stitch-forming and feeding mechanism, and a throatplate having a needle-aperture, of work-severing mechanism comprising coacting blades having their cutting edges disposed in operative position rearwardly of said needlea n:rture and in substantial alinement therewith in the direction of feed, a pivotal support common to both of said blades, means for rigidly securing one of said pivotall supported blades against incidental movement during the severing operation means for actuating the other of said blades upon its pivotal support, and means for yieldinglv maintaining said blades in shearing relationship.

10. In a sewing machine the combination with stitcli-l'orn'iing and feeding mechanism, and a throat-plate having a needle-aperture, of work-severing mechanism comprising (:0- -acting blades having their cutting edges disposed in operative position rearvardly of said needle-aperture and in substantial alinement therewith in the direction of feed, supporting and actuating means for said blades including a pivotal support common to both of said blades comprising a supporting bracket, a tubular fulcrum stud sustained by said bracket and entering fulcrum-apertures in said blades, a screw threaded into said tulcrunrstud, and yielding means for maintaining shearing relationship between said blades.

ll. A pieot-edging attachment for sewing machines comprising a supporting bracket provided with a cam-slot, a pair of cutting blades, a fulcrum-stud for said blades sustained by said bracket, means for maintaining said blades in shearing relationship, one of said blades being provided with a camslot adjacent to and inclined with respect to the supporting bracket cam-slot in the operative position of said blade, a securing bolt shittabl disposed in said cam-slots, and operative connections for actuating the other of said blades during the operation of the machine.

In testimony whereof I have signed my name to this specification.

FREDERIC M. CARD.

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