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Aug. 27,1946. I ' w_ MYERS 4‘ I ' 2,406,623 WORK-GUIDING MECHANISM FOR SEWING MACHINES Filed Dec. 30, 1943 ZYSheetS-Sheet 1 51° 64 v60 ‘32/ clljalzfercyfem i 3 5253.51‘ Aug. 27, 1946. - w, MYERS’ ' 2,406,623 rWOBK-(“JIDING’v MECHANISM FOR SEWING MACHINES Filed Dec. 30, 1945 2 Sheets-Sheet .2 l l I ,J. J2- ‘ r ‘I v l 7- ‘ ' ?an/bum I‘ CZZJa/ter 972679416‘ m¢¢azm Patented Aug. 27, 1946 a 2,406,623 UNITED. STATES PATENT OFFICE» ‘WORK-GUIDING MECHANISM FOR SEWQING MACHINES _ . . Walter Myers, Stratford, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J ., a corporation of New Jersey Application December 30, 1943, ‘Serial (No. 516,158 15 Claims. (01. 112-2) ~ 1 . chines for spiral stitching purposes, such as spirally stitching the brims of sailors’ hats. The invention has for an object to provide a work-shifting mechanism assembly unit with ‘which sewing machine units may be conveniently or interchangeably associated. Another object of this invention is to provide means facilitating accurate repositioning of a traveling work-guide, as for example in the event of thread breakage in spiral stitching operations. Other and more speci?c objects of the invention will be apparent from the following description and‘claims. - ‘ . I g . 2. , . turally substantially the same as disclosed in the U. S. Patent of S. ‘ZOhis,'N0. 2,267,581, Dec. 23, 1941;, it‘will be understood from‘the following de scription that other kinds" and varieties of stitch This invention relates to work-guiding mech-. anisms employed in connection with sewing ma forming‘and ‘work-feeding mechanisms could be employed'witho'ut departing ‘from ‘the spirit and scope of the'present invention. ' ‘ ‘ ‘ ' ’ ' ' ‘ As more fully shown and described in said prior Patent No. 2,267,581; the sewing machine illus trated has a; vertically re'ciprocatory needle “land a complemental loop-taker I5; said loop-taker be ing “rotated'by suitable connections ‘(not shown) - with a bed-shaft 16 disposed at the underside and extending horizontally lengthwise of the bed-plate The bed-shaft‘l? is "rotatably'journaled in a‘ballebearing I‘! supported by'the' bed-plate Ill 15 II). The invention comprises the devices, combina and, adjacent said ball-bearing‘l'l, a peripherally ' tions and arrangements of parts hereinafter de .grooved pulley i8 is secured bya screw 19‘ upon scribed in connection with the accompanying the end of ‘the bed-shaft l6 which is disposed drawings, which illustrate a preferred embodi 20 below the bracket-arm standard ll. -Engaging ment of the invention and in which: Fig. 1 is a perspectiveview of a sewinginachine unit supported by a base-unit which contains the improved work-guiding mechanism. Fig.’ 2 repre sents a vertical section of the work-guide carrier taken lengthwise of the guide-carrier adjusting 25 spindle. ‘Fig. 3 represents a fragmentary vertical section of the guide-carrier, taken substantially on the line 3-—3 of Fig. 2 and showing‘ a portion of a modi?ed lead-screw.‘ Fig. 4 is a top-plan view the pulley I8 is a clip-belt-ZO by means of which the bed-shaft 1-6 is rotated once for each complete reciprocation of the needle I 4. ' - » ' ' The work is advanced across the bed-plate It] by a‘ conventional feed-dog 2| which operates through a work-supporting throat-plate 22 and is opposed in its work-engaging movements by a spring-depressed presser-foot 23. ~ " ~ ' The sewing machine above generally described of the work-guide with the top plate of the work 30 is removably supported upon a base-unit having a frame including a hollow pedestal 24 and a guide removed and showing a portion of the lead trough-shaped‘arm 25 extending laterally from screw. Fig. 5 represents horizontal sections taken the upper portion of the base 24 andfree at its at different levels of the right'hand' end portion outer end. The arm 25 of the base-unit and the ofthe base-unit pedestal; the sections being taken in substantially the horizontal planescontaining :35 sewing machine bed-plate l0, together provide a free work-arm adapted to accommodate endless the axes of rotation of the respective shafts shown. Fig. 6 represents a vertical section of the intermediate shaft driving worm and taken on works" Secured by screws ZBupon > the front .\ face -. of the substantially the line B—6 of Fig. 5. Fig. 7 repre sents a vertical section of the work-guide and its carrier, the section being taken' in substantially bearing bosses 28 - and 29 having horizontally the vertical plane containing the rotation-axis of pedestal 24 is a bracket 21 formed with spaced alined apertures 30 and 3|. Rotatably journaled in, the bearing-apertures30,;3| of the bracket 2'! is a horizontally disposed shaft 32 extending lengthwise of the base-unitarm- 25 and having the lead-screw. Fig. 8 represents a verticalsec tion of’a portion of the base-unit pedestal and of the sewing machine bed-plate, the section be 45 one end portion thereof in the region'of the free end of the work-arm freely suspended.’ The shaft ing taken in substantially the vertical plane con taining the axis of rotation of the intermediate 32 is held against endwise-movement in the bear ing-bossesZB and 29 by suitable collars 33. The shaft which engages the lead-screw shaft. suspended portion of the shaft 32 is provided with The sewing machine unit illustrated in Fig. 1 of the drawings'has a bed-plate [0, from one end of which rises the hollow standard H of a bracket-arm ' l2 which terminates in a head l3 and overhangs the bed-plate Ill- .While the stitch forming and work-feeding mechanism of the a spiral thread 34' of slow lead to form a lead screw; the spiralthread 34 extending from the free end of the shaft 32 and preferably terminat ing'short of the bracket-boss 28. Adjustably se cured upon the shaft 32, between the lead-screw sewing machine shown in theidrawings is struc~ 55 thread'thereof and the bracket-boss 28, is a stop 2,406,623 3 collar 35, of which the function will be hereinafter described. The end of the lead-screw shaft 32 opposite to the threaded end thereof is provided within the bracket-boss 29 with a worm-gear 36. hi driving pinion 63 functions as a follower-nut which is complemental to the lead-screw thread 34 in ef fecting feeding of the carrier 53 lengthwise of the shaft 32 during rotation of said shaft 32. However, the spindle 62 may be readily rotated by manual manipulation of the nut 66 when the engagement with the under side of the worm shaft is stationary, to attain accurately any gear 36 is a worm 37 carried by the forward end desired position of the carrier 53 upon the shaft of an intermediate shaft 38 disposed horizontally 32. As the lead-screw end portion of the shaft transverse to the shaft 32 and extending into an opening 39 provided in the bracket~boss 29. The 10 32 is free of the supporting base 24, the carrier ‘55 may be conveniently applied to and removed intermediate shaft 33 is journaled eccentrically in from the shaft 32 endwise thereof. a bearing-bushing '40 secured by a screw 4! for Any suitable form of Work-guide may be asso~ turning adjustment in an internal bearing-lug 42 ciated with the carrier 53. The tubular work of the pedestal 24. This construction not only provides for convenient assembly of the shafts 32 .15 guide illustrated in Figs. 1, 4 and '7 of the draw ings comprises adjacent bottom-plates 519i and ‘ill and 38 in the proper intermeshing relation of the individually secured for adjustment relative to worm-gear 36 and worm 31, but also facilitates each other upon the carrier 53 by pairs of screws replacement of the lead-screw-shaft 32. , ii and. 72 passing freely through elongated coun Secured upon the rearward. end of the interme diate shaft 38, by a screw 43, is a worm-gear 44 20 tersunk slots '53 and ‘i4 provided in and extend ing transversely of the respective plates. The engaged by a driving worm 45, disposed above the plates 59 and ‘ill have segmentally curved side worm-gear. 44 and rotatably journaled upon a ?xed stud 43. As illustrated in Figs. 5 and 6 - edges, and the relatively remote curved side edges of the respective plates are bent upwardly and of the drawings, the stud 45 is secured bv a screw v4‘! in a wall of the pedestal 24 to extend inwardly 25 backwardly to form ?anges overhanging the plates, thereby to provide spaced and opposed from said wall in substantial axial alinement with edge-guides ‘l5 and it. Detachably supported by the bed-shaft E6 of the sewing machine and in parallel relation to the lead-screw shaft 32. At the overhanging side'flanges of the plates 59 and 73, in spaced relation to said plates, is a top its inner end, the worm 45 has a driven-member in the form of a ?ange 48 provided with a crank 30 plate 'l'l having'its front edge portion bent back upon itself to form a loop 18 entered by the front pin 49. ' ends of said ?anges. 'The right hand edge por The bed-shaft pulley it of the sewing machine tion of the top-plate ‘H is provided at the upper has an internal hub l3". Secured by a screw 53 side thereof with a supporting and. locating block upon the pulley-hub I8’ is a recessed driver ‘it which is recessed to receive the ?ange of the member in the form of a collar 5! provided with a crank-pin 52 disposed to engage the crank-pin 49 of the worm 45, thereby to rotate said worm 45 with the bed-shaft I6. The described driving bottom-plate ‘ill, thereby to support and to lo cate the right hand edge of the top-plate T! in spaced relation to the edge-guide '15. By this means, increased clearance is provided within arrangement for the worm 45 provides for ready removal of the sewing machine unit from the 40 the work-guide at the right hand side thereof, base-unit’ and permitsrof convenient association of a sewing machine unit or different sewing ma for work having a rib at one edge as in sailors’ hat brims. ' ' ' ' ' ' The described Work-guide merely rests upon the bed-plate ill of the sewing machine; the con Slidably supported upon the threaded free end portion of the lead-screw shaft 32, for travel 45 nection between the workéguide carrier 53 and the lead-screw shaft 32 permitting pivotal move lengthwise of said shaft and, therefore, cross 'ment of the carrieri53 upon‘said shaft. ‘This wise of the line of feed of the sewing machine, construction’ therefore provides for readily is a work-guide carrier 53 having a lead-screw swinging the work-guide forwardly about the shaft receiving aperture 54, Extending forward chine units with the base-unit. _ ly from one end of the carrier 53 is a boss 55 50 shaft 32 into an out of the way‘positi'on. having an aperture 56 extending transversely of the aperture 54 and connected therewith by a follower-clearance opening 51. Secured inv the carrier-boss 55 by a screw 53, for turning ad ’ ’ While'o-bviously capable of other uses, the pres ent improvement is particularly well adapted for spirally s-titching'the brims of‘ sailors’ hats. "The brim to be‘ stitched ispassedthrough the work justment, is a bearing-bushing 53 formed with a 55 guide and is directed by the edge-guide 'Hi'thereof during the feeding of the brim by the ‘feed-dog ?ange 60 in engagement with the front end of 22 across the bed-plate Ill. ' In the operation of thecarrier-boss 55. The bearing-bushing 59 is eccentrically provided with a, bearing-aperture ' the sewing machine, the‘work is fed past the stitch-forming mechanism, across the bed-plate Rotatably journaledin the bearing-aperture 6! 60 ill, by the feed-dog 21 and ‘is at the same time progressively shifted sidewise to the right by the of the bushing59is a spindle 62 extending hori rotating lead-screw '32. ’ ' zontally transversely of the shaft 32 vand pro In‘ its sidewise travel, the work-guide? carrier vided .at its rearward end with a cylindrical head 53 ultimately engages'the stop-‘collar 35 and is 63 held in frictional engagement with the inner end of the bushing 59. The spindle-head 63 com 65 thereby arrested in a location' of the work-guide predetermined by the setting of the stop-collar prises a pinion having teeth 54 formed to mesh 35. This is permitted in the int'ermeshing rela with the lead-screw thread 34 of the shaft 32. tion of the spindle '33‘ and'the lead-screw thread Securedbv a screw 65v upon the forward end of 34, by reason of the vfact that the positive stop the spindle E2 is a knurled nut 55 having an axial cavity 61. Housed'in the nut-cavity 6? is 70 ping of the carrier 53 by ‘the collar 35rserves to overcome the rotation-‘restraining friction. im a coil-spring 68 interposed between the nut 66 posed by the spring '58 upon the pinion 63, there; and the bushing 53 and functioning to restrain by inducing the spindle 62 to rotate idly in the the spindle 62 against rotation during stitching operations of the sewing machine. When the spindle 62 is thus restrained against rotation, the 75 In ‘the modified‘ form of construction" illus carrier 53. " ' ' ' ‘_ 4 h “ ’ ‘2,406,623 5 said lead-screw, and operative connections’for rotating said intermediate shaft from said driver trated inFig, 3 ‘of thedrawings, a, substitute rotary shaft 32' having‘ a spiral lead-screw thread 34' is provided with a circumferential groove 80 at a location in the length of the shaft which corresponds, substantially to the position of the left hand end of the stop-collar 35 above de scribed; In this form of construction, the pinion member. 7 - T 4. A spiral stitching mechanism comprising, in combination, a base-unit including a supporting pedestalhaving a lateral arm free at one end, a, lead-screw rotatably supported by said base 'unit and extending lengthwise of said arm, a work-guide operatively connected to said lead 10 screw to derive lateral movements therefrom the carrier to rest. , , , 7, upon rotation of the lead-screw, a sewing machine Having thus set forth the nature of the inven-' 63 rides off thelead-screw thread 34,’ in the travel of the WQrk-guidecarrier 53, thereby bringing tion, what Iclaim herein is: ,. unit removably supported upon said base-unit , ,1, A spiral stitching mechanism comprising, in combination, a base-unit including a supporting and having a frame including a bed-plate and a bracketearm overhanging the bed-plate, said sew pedestal'having' a lateral arm free at one end, a 15 ing machine unit containingv stitch-forming and lead-screw rotatably supported by said base-unit and ‘extending lengthwise of said arm, a work guide operatively connected to said lead-screw to derive lateral movements therefrom upon rota tion of the lead-screw, a sewing machine unit re movably Supported upon said base-unit and hav ing a frame including a bed-plate anda bracket work-feeding mechanism including a rotary bed shaft disposed below said bed-plate and substan tially parallel to said lead-screw, a driver-mem ber carried by said bed-shaft for rotation there 20 with, a driven-member journaled upon said ped estal coaxially of , said bed-shaft and disposed for rotating engagement by said driver-member, arm overhanging the bed-plate, said sewing ma a bearing-bushing extending crosswise of ‘said chine unit containing stitch-forming and work lead-screw and supported by said pedestal for feeding mechanism including. a rotary driver member, a driven-member journaled upon said turning adjustment about its longitudinal axis, an intermediate shaft rotatably journaled eccentri pedestal coaxially of said driver-member and disposed for rotating engagement by said driver member, and operative connections with said tating gears connecting driven-member, inter driven-member for rotating said lead-screw’. 2. A spiral stitching mechanism comprising, in combinatioma base-‘unit including a supporting 5. A work-guiding base-unit support for sewing machines, comprising, a pedestal having a lateral cally in said bearing-bushing, and lead-screw ro mediate shaft and lead-screw. arm free at one end and adapted to support a pedestal having a lateral arm free at one end, a lead-screw rotatably supported by said base-unit and extending lengthwise of said arm, a work guide operatively connected to said lead-screw to derive lateral movements therefrom upon rotation sewing machine, a lead~screw shaft rotatably sup ported by said pedestal and extending lengthwise 35 of said arm, said shaft having a threaded free end of the lead-screw, a sewing machine unit remov ably supported upon said base-unit and having a frame including, a bed-plate and a bracket-arm all) overhanging the bed-plate, said sewing machine unit containing stich-forming and work-feeding mechanism including a rotary bed-shaft disposed below said bed-plate and substantially parallel to " portion of its length disposed in the region of the free end of said work-arm, a crank-member sup ported by said pedestal for rotation about an axis substantially parallel to the axis of rotation of said lead-screw shaft, an intermediate shaft ro tatably journaled in said pedestal and having gear connections with said crank-member and said lead-screw shaft, a work-guide carrier supported - bed-shaft and having a crank-pin, a driven-mem to travel lengthwise of said lead-screw shaft, and a follower-nut supported by said carrier and dis ing a frame including a bed-plate and a bracket restraining said pinion against rotation, thereby said lead-screw, a driver-member carried by said posed in carrier-propelling engagement with the ber journaled upon said pedestal coaxially of said thread of said lead-screw shaft. bed-shaft and having a crank-pin disposed for 6. In a work-guiding device for sewing ma engagement by said crank-pin of the driver-mem chines, a rotary shaft restrained against endwise I ber, an intermediate shaft rotatably journaled in 50 movement and provided with a lead-screw thread, said pedestal and extending crosswise of said lead a work-guide carrier adapted to be propelled end screw, worm and worm-gear connections between wise of said shaft, a pinion rotatably journaled in said driven-‘member and said intermediate shaft, said carrier and disposed in mesh with the lead and worm and worm-gear connections between screw thread of said shaft, and means for re said intermediate shaft and said lead-screw. straining said pinion against rotation, thereby to 3. IA. spiral stitching mechanism comprising, in convert said pinion into a follower-nut. combination, a base-unit including a supporting 7. In a work-guiding device’ for sewing ma pedestal having a lateral arm free at one end, a chines, a rotary shaft restrained against endwise lead-screw rotatably supported by said base-unit and extending lengthwise of said arm, a work 60 movement and provided with a lead-screw thread, a work-guide carrier adapted to be propelled end.. guide operatively connected to said lead-screw to wise of said shaft, a pinion rotatably journaled in derive lateral movements therefrom upon rota said carrier and disposed in mesh with the lead tion of the lead-screw, a sewing machine unit re screw thread of said shaft, and friction means for movably supported upon said base-unit and hav to convert said pinion into a follower-nut. arm overhanging the bed-plate, said sewing ma 8. In a work-guiding device for sewing ,ma chine unit containing stitch-forming and work chines, a rotary shaft restrained against endwise feeding mechanism, a rotary driver-member car movement and provided with a lead-screw thread, ried by the sewing machine mechanism, a bear ing-bushing extending crosswise of said lead TU a Work-guide carrier adapted to be propelled end screw and supported by said pedestal for turning wise of said shaft, a spindle rotatably journaled adjustment about its longitudinal axis, an inter in said carrier and extending cross-wise of said mediate shaft rotatably journaled eccentrically in said bearmg-bushing, Worm and worm-gear shaft, said spindle having a peripherally toothed head in mesh with the lead-screw thread of said connections between said intermediate shaft and 75 shaft, and means for restraining said‘ spindle 2,406,623 7 against‘rotation, thereby to convert vsaid head into a vfollower-nut. , ' ‘ lead-screw shaft ‘extending throughyone of the apertures of and 'slidably supporting saidcarrier, a spindle rotatably journaled in the other aper ture of said carrier, a pinion carried by one end of said spindle and disposed in mesh with the thread of said lead-screw,rmeans carried by the other end of said spindle and disposed externally of said carrier for manually rotating said pinion, carrier for turning adjustment about an axis and means for securing said spindle against rota transverse to the rotation-axis of said shaft, a spindle rotatably journaled eccentrically in said 10 tion, thereby to convert said pinion into a fol lower-nut. bushing and carrying a pinion in mesh with the 13. In a work-guiding device for sewing ma lead-screw thread of said shaft, and means» for chines, a rotary shaft restrained against endwise restraining said spindle against rotation, thereby movement and providedwith a lead-screw thread, to convert said pinion into a follower-nut. 10. In a work-guiding device, for sewing gma— 15 a work-guide carrier adapted to be propelled end wise of, said shaft, a pinion rotatably journaled chines, a rotary shaft restrained against endwise in said carrier and‘ disposed in mesh with the movement and provided with'a lead-screw thread, lead-screw thread of said shaft, manually oper a work-guide carrier adapted’to be propelled end abiermeans for rotating said pinion, and means wise of said shaft, a pinion in mesh with the lead for securing said pinion against rotation, thereby screw' thread of ‘said shaft and journaled in said to convert said pinion into a follower-nut. carrier for rotation about an axis transverse to 14. In a work-guiding device for sewing ma the rotation axis of said shaft, means providing chines, a rotary shaft restrained against endwise forsadjustment of said pinion toward and from movement and provided with a lead-screw thread, ‘ said shaft, and means for restraining said pinion a work-guide carrier adapted to be propelled end against rotation, thereby to convert said pinion 9. In a work-guiding device for sewing nia chines, a rotary shaft restrained against endwise movementand provided with a lead-screw thread, a work~guide carrier adapted to be propelled end wise of said shaft, a bushing journaled in said wise of said shaft, a pinion rotatably journaled intoafollower-nut. » r i 11. In a work-guiding device for sewing ma chines, a rotary shaft restrained against endwise movement and provided with alead-screw thread, a work-guide carrier adapted tobe propelled end wise of said shaft, a spindle journaled in said carrier for rotation about an axis transverse to the rotation-axis of said shaft, a pinion carried by said spindle and disposed in mesh with the lead-screw-thread of said shaft, a manually ro- ‘ tatable nut carried by said spindle for rotating said pinion, and spring means for frictionally securing said‘spindle against rotation in said car rier, thereby to convert saidpinion into a fol lower-nut. , 12. In awork-guiding device for sewing .ma chines, a rotary shaft restrained against endwise movement and provided with a lead-screw thread, a transversely apertured work-guide carrier, a in said carrier and disposed in mesh with the lead-screw thread of said shaft, yieldable means for securing said pinion against rotation, and means limiting the travel of said carrier in one direction. - .1 25. In a work-guiding device ‘for sewing ma chines, a rotary shaftrestrained against end wise movement and provided with a lead-screw thread, a work-guide carrier adapted to be pro pelled endwise of said shaft, a pinion rotatably journaled in said carrier and disposed in mesh with the lead-screwthread of said shaft, yield - able means for securing said pinion against rota tion, and a stop-member carried by said shaft and disposed in the path of movement in one direction of said carrier. , a Y WALTER MYERS.