US1825634A - Sewing machine - Google Patents

Description

20, 1929 2 Sheets-Sheet l W. MYERS SEWING MACHINE Filed Dec.

Sept.. 29, 1931.

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Sept. 29, 1931.

the zigzag-stitches with respect to the direcof the sewing machine fittings, said Vbead- "i" l less frequency vthan the endwise yreciproca- 'bead-chain in the raised position of the feed- Patented Sept. 29, 1931 UNITED STATES PATENT orifice WALTER MYER-S, 0F BRIDGEPORT, CONNECTICUT', ASSIGNOR TOTHE SINGER MAN'U- FACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION lOIE -NEW JERSEY v SEWING MACHINE Appiicauon filed December zo, 1929. e seriai No. 415,449. i l i This linvention relates to improvements in tions of the needle. Thesewing machine is work-guiding and -feeding devices for seivprovided with guiding means for directing ing machines and has for its object to provide an edge of the body-materiall and: a beadsimple and efficient means for attaching beadchain in juxtaposed relation within lthe range chains and equivalent articles to body-maof lateral vibration of the needle. The feed- El' terials for purposes of ornamentation or reining mechanism includes a feed-dog engaging forcement. the bead-chain substantially at or rearwardly As commonly constructed. the beads and of the needle and which feeds the chain-beads bead-,Conecting links of a bead-cliaiii are relaslightly faster than the advancing movement tively movable to alimited extent in a direcofthe body-material, thereby slightly crowd- Y* tion lengthwise of the chain. It has been a ing the chain-beads together for the purpose prior practice to attach a bead-chain along of rendering thechain extensibleand capable the edge of a body-material by means of a of adapting itself to curved body-material y zigzag-stitch sewing machine, with the inmargins. i m ll-f tended object of 'having the zigzag-stitches Bearing upon the body-material adjacent "f successively formed across the chain-links the needle is a presser-member which is yieldbetween successive beads of the chain. Howingly mounted independently of an auxiliary ever, because of the relatively movable charpresser-member yieldingly engaging the A acter of the chain-beads and the inclination of chain-beads. 'In the preferred embodiment tion of the chain-length, it has heretofore chain feeding means' and auxiliary presserproven practically impossible to attach beadmember are so constructed as to clamp the chains to body-materials, under commercial bead-chain upon the work-'support between Y conditions of high speed of operation of the advancing movements ofthe bead-chaim'the e machine, without frequently skipping a beadpresser-memberbeing lifted clear of the porif* link and thereby marring the appearance and tion Of the bead-chain in advance of the needle impairing the strength of the product. each time that a beadV of said chain is ad- According to the present invention, a beadvanced by the feedlng mechanism. In order chain is secured to a body-material margin to Aprevent crushing of the chain-beads'be- Sii by pairs of substantially parallel Stitches tWeeIl the fededog and the end Wall 0f the crossing each of the chain-links between sucfeed-Slot 111 the thrOat-plate there is provided cessive chain-beads, said-pairs of stitches be- 2L Chalnjguard'whlch in a preferred embodiing substantially normal to the length of the ment COInpIises a spring-plate secured upon chain and joined by connecting stitches an- 'thethI'Oat-plate in position to partially enter ,W chored in the body-material. This attachthe throat-plate feed-slot andy'ieldingly bear j ine' seam provides for freedom of movement upon the feed-dog beyond its rearward tooth. of the chain-beads toan extent necessary to In the accompanying drawings, Fig. 1 is obviate ldistortion of a curved body-material a longitudinal section, partly in front' eleva'- margin to which the chain is attached and tion, of a sewing machine containing a" pre- 40 also greatly simplifies the problem of preferred embodiment of the present improveventing the undesirable skipping ofany of ment. Fig. 2' is a bottom plan view of the the bead-links. machine. Fig. 3 is a top-plan view of the In order to attach bead-chains to body-maportion of the sewing machine cloth-plate terials in the present improved manner, there surrounding the stitching point, including a "i5 is preferablvemployeda sewing machine havtop-plan view of the auxiliaryrpresser and a ing stitch-forming mechanism including an portion of the work. Fig. llis a sectional view endwise reciprocatory and laterally vibrasubstantially on the linea-4 of 3, illustory needle and a feeding mechanism imtrating the clearance between the auxiliary parting advancing movements to the work of presser and the unstitched portion of the wr dog. Fig. 5 is a perspective view of the feeddog. Fig. 6 is a perspective view of the front part of the throat-plate. Fig. 7 is a perspective View, partly in section, of a fragment of the product. Fig. 8 is a view in elevation and partly in section of the supporting means for the spring which yielding'ly maintains the needle-vibrating bar in Contact with its act-uating cam.

Referring to the drawings, the sewingmachine frame comprises a bed-plate l, of which the upper side serves as a cloth-plate, and a hollow standard 2 of a tubular bracketarm 3, terminating in a head 4.

Journaled in suitable bearings provided in the bracket-arm 3 is a rotary mainor actuating-shaft 5, carrying at itsouter end a combined belt-pulley and balance-wheel 6, and at its opposite end a crank-dise 7 connected in the usual manner by means of a. link 8 with a pin 9 projecting from a collar 10 secured upon a needle-bar 11 carrying a needle 12. The needle-bar 11 is journaled for endwise, substantially vertically reciprocatory movements in suitable bearings provided in a swinging frame 13 pivotally supported at its upper end by a fulcrum-stud 14 upon the head 4.

The swinging frame 13 is pivotally `connected with one end of a vibratorv-bar 15, of which the opposite end has an offset arm 16 resting upon av cam 17. The cam 17 is carried by a. short shaft 18, journaled in the bracketarm 3 transversely of the main-shaft 5 yand deriving one rotation from said main-shaft 5 to every three rotations of the latter by suitable gear-connections therewith. The arm 16 of the vibratory-bar 15 is yieldingly maintained Vin contact with the cam 17 by means of a spring 19 coiled about a vertically directed rod 20 of which the lower end has a fork 21 straddling .the bar 15 and connected therewith by means of a pivot-bolt 22. The @ring 19 is interposed between the fork 21 of the rod 2O anda bearing-washer 23 having n rounded upper end engaging the similarly shaped lower end of a bushing 24. adiustably threaded into an aperture in the bracketarm 3 and secured by a nut 25. The upper end of the rod 20 is tapered and has sufficient clearance within the bushing 24 to provide for the relatively short, lateral vibrations -imparted to the lower end of the rod by the needle-vibrating movements of the vibratorylmr 15, it being understood that the rounded washer 23 is free to rock in its seat in the bushing 2,4.

It is apparent that the cam 17 imparts lateral vibratory movements to the bar 15 about its pivotal connection with the swinging frame 13. These lateral movements of the bu* 15 are in part converted. in a well known manner, into endwise reciprocatory movements by pivotally connecting said bar 15 with one end of a link 26 of which the opposite end has a. pivotal support 27 constituting a fulcrum for the vibratory-bar 15 as disclosed, for instance, in the patent to C. F. Gray, No. 933,032, dated Aug. 31, 1909.

Cooperating with the needle 12 in the format-ion of lock-stitches is .a loop-taker 29 carried by a rotary shaft 30, journaled beneath the cloth-plate and disposed transversely of the path of needle-vibration. The loop-taker shaft 30 carries a bevel-gear 31 in mesh with a similar gear 32 upon one end of a loop-taker actuating shaft 33 of which the opposite end carries a pulley 34 connected by a cleated belt 35 with a driving pulley 36 iixed upon the main-shaft 5.

The loop-taker actuating shaft 33 is rotatively journaled within a hollow., feed-lift rock-shaft 37, which is in turn journaled in spaced bearing-lugs, as 38, depending from the bed-plate 1. A crank-arm 39 clamped upon this rock-shaft 37 is connected by a vertically directed link 4() with a rock-lever 41 having a fulcrum 42 upon the bracket-arm 3. The rock-lever 41 has a laterally ofset free end vcarrying a roller 44 tracking a cam-groove 45 provided in the inner side of a cam-disk 46 fixed upon the transverse shaft 18. The action of the Cain-groove 45 is to impart only Yone complete rocking movement to the rock-lever 41, 43 during three complete rotations of the main-shaft 5.

The feed-lift rock-shaft 37 also carries a crank-arm 47 suitably engaging one end of a feed-bar 48 of which the opposite end is pivotally connected in the usual manner with a feed-advance rock-shaft A50 journaled in bearing-lugsA .as 51 depending from the bedplate 1. Suitably clamped upon the rockshaft 50 is a crank-arm 52 pivotally connected with the lower end of Aa pitman 53 having a strap 54 embracing an eccentric (not shown) adjustably secured upon the mainshaft 5 in .any suitable or well known manner. It will be understood from the foregoing description that while the feed-bar 48 receives substantially horizontal, forward and return movements for each complete reciprocation of the needle, it is Vraised into engagement with the work once only during three complete reciprocations of the needle.

Secured upon the feed-bar 48 is a feed-dog 55 having a row of workengaging teeth, as 56, disposed at one side of the needle-path, the two rear teeth 56 and 56" which have their work-advancing movement entirely rearward of the needle being widened to extend across the line of seam formation. The feed-dog tooth 56 is in part supported by a stay-bar 57 rising from the front end of the feed-dog 55, the upper side of the staybar being disposed below the level of the points of the teeth. The teeth of the feeddog 55 are intermittently projected through a slot 58 formed in a throat-plate 59 suitably secured upon the cloth-plate 1. Another slot inthe throat-plate affords clearance for the stay-bar 57 of the feed-dog, said throatplate having a needle-slot 6l elongated transversely of the line of seam formation and disposed between the throat-plate slots 58y and 60. Rising from tthe throat-plate directly in front of the needle-slot 61- is a guide-iin 62 of `which one side serves as an edge-guide for a body-material M and the opposite side as a guide for the beads B of a bead-chain. Rearward of the needle-slot 6l the throatplate is cut away to provide a clearance-slot 63 forthe widened feed- dog teeth 56, 56".

Projecting downwardly within the throatplate slot 63 and bearing upon `a ledge 64 upon the feed-dog rearward and below the tooth 56`is a bead-chain guard comprising in the present Vinstance a spring-plate 65 secured by a .screw 66 upon the throat-plate. The free end ofthe guard 65 rises and falls with the feed-dog of which the ledge 64 slidingly engages the guard. This construction prevents entrance of the bead-chain into the throat-plate slot 63 "and thereby serves to guard against crushing of the bead-chain between the end Yof the feed-.dog and the rear 'wall of the feed-slot in the throat-plate. While this guard device is useful in supporting the bead-chain while attaching to relatively flimsy materials, its primary purpose is to successfully initiate a stitching operationvinasmu'ch as the first b'eadof the chain is beyond the stitching point when engaged by the feed-dog and isV therefore unsupported by stitching.n y

' Opposed tothe row of feed-dog teeth 56 is a presser-roller 67 rotatively carried by an arm 68 extending forwardly from a bracketA 69 suitably secured upon the usual springdepressed presser-bar (not shown) 'journaled for endwise movements inthe bracket-arm head 4. This presser-roller yieldingly bears upon the margin of the body-material M, directed by the guide-fin 62, so that the bodymaterial edge crosses the throat-plate needleslot-61 within the range of lateral vibration of the needle.

Yieldingly clamping the bead-chain B against the throat-plate, in the lowered position of thefeed-dog, is an auxiliary-presser 70 comprising a bent-plate pivotally 'supported l by 'pintle-'screws as 7l, secured in spaced brackets, as 72 rising from a segmentplate 73 detachably fastened upon the clothplate l. The end of the auxiliary-presser adjacent to the presser-roller 67 is undercut-to provide a shoulder 7 Ll-detining a chain guidewaybetween said shoulder and the guide-lin 62. The auxiliary-presser is extended beyond i' its fulcrum to provide convenient means for manually raising the beadfchain engaging end of said presseragainst the action of a spring 75 .interposed between the segmentplate 73 and the extended end of the auxiliary-presser. The work-engaging end of the auxiliary-presser has a needle-slot 76 infront of which the end'of said presser is partially cut away so as to be disposed in substantial Contact with the bead-chain side of the guidefin 62, thereby providing a closed guideway for the bead-chain which is automatically directed past the stitch-forming mechanism.

The operation of the machine will be apparent from the foregoing description. The beads B of the bead-chain are regularly con-Y structed so as to be movable to a limited eX- tent lengthwise of the chain-links L. An -edge of the body-material M and the beads B of the bead-chain are directed past the stitchforming mechanism by oppositesides of the guide-lin V62 and Ywhen the feed-dog rises, the inclined front side of the feed-dog tooth 56' engages a rbead B and slightly advances the bead before the actual feeding of the bodymaterial commences. lt will be understood that the bead B engaged between the teeth 56 and 567 is disposedrearwardly beyond the link L, connected with said bead and secured by stitching before said bead is en- `raged bv the feed-dog. In other words, the advanced bead is rearwardly beyond the stitching point and therefore the advancing or the unstitched portion of the chain is the result of a pulling Hactionvthereuponwhich is unhampered by any pressure upon theV unstitched portion of the chain by reason of the factv that the auxiliary-presser is slightly raised above the unstitched portion of the chain bythe bead -engaged by the feed-dog duringits feeding movement. By employingpressers yielding independently of each other in their engagement with the body-material and the bead-chain, the control of the work is unaffected by any difference between thethicknesses of the body-material and the size of the bead-chain.

During the stitching operation, the needle is vibrated to make a pair of stitches S, comprising lateral and return stitches, across eachl o f the chain-links L between successive feeding movements of the work. The needle path then remains fixed until the work is advanced and a stitch T is made in the bodyma l terial, after which the cycle is repeated.

Having thus set forth the nature of invention, what I claim herein is A 1. In a sewing machine for attaching a bead-chain to a body material, a work-'support, a reciprocatory and laterally vibrator-y needle, means for advancing the body-material and the bead-chain past the needle including a feed-dog projected through the work-support to engage the chain-beads rearwardvonly of the needle, and presser devices opposed to said work-support bearing upon the body material and bead-chain to yield independently of each other.

`2. In a sewing machine for attaching to a body-material a bead-chain having chainbeads movable a limited extent relative tothe the 'Ido

chain-links in a direction lengthwise of the bead-chain, stitch-forming mechanism including an endwise reciprocatory and laterally vibratory needle, means for feeding the body-material past the stitch-forming mechanism, and means for feeding the chain-beads relatively faster than the advancing movement of the body material.

3. In a sewing machine for attaching a bead-chain to a body-material, stitch-forming mechanism including an endwise reciprocatory and laterally vibratory needle, means for directing an edge of the body-material and the bead-chain in juxtaposed relation within the range of lateral vibration of the needle, and intermittently acting work-feeding means including a feed-dog having workfeeding movements of less frequency than the number of complete reciprocations of the needle.

4. In a sewing machine for attaching to a body-material a bead-chain having chainbeads movable a limited extent relative to the chain-links in al direction lengthwise of the bead-chain, stitchforming mechanism including an endwise reciprocatory and laterally vibratory needle, means for directing an edge of the body-material and the bead-chain in uxtaposed relation wi hin the range of lateral vibration of the needle, and an intermittently acting feed-dog 4conlined to effective work-feeding movements at every third reciprocation of the needle, said feed-dog acting to advance the chain-beads relatively faster than the body-material.

5. In a sewing machine for attaching to a body-material a bead-chain having chainbeads movable a limited extent relative to the chain-links in a direction lengthwise of the bead-chain, stitch-forming mechanism including an endwise reciprocatory and laterally vibratory needle, means for directing an edge of the body-material and the beadchain within the range of lateral vibration of the needle, and work-feeding means including a' feed-dog having spaced teeth disposed to successively receive therebetween the beads of the bead-chain, said feed-dog having a work-feeding movement of an extent determined according to the maximum spacing Vof the chain-beads, whereby the beads of the chain are initially engaged by the point of a feed-dog tooth and are advanced relatively to the feed-dog by an inclined side of said tooth during the further bead-engaging movement of the feed-dog.

6. In a sewing machine, a work-support, stitch-forming mechanism including an endwise rcciprocatory and laterally vibratory needle. a feed-dog intermittently projected through the work-support, an edge-guide disposed to direct an' edge of a body-material within the range of lateral vibration of the needle, a roller-presser opposed to the 'feeddog at the body-material side of the edgeguide, and an auxiliary-presser having n bead-chain guideway disposed to direct the bead-chain within the range of lateral vibration of the needle in juxtaposed relation with the edge of the body-material.

7. In a sewing machine, a work-support, stitch-forming mechanism including an endwise reciprocatory and laterally vibratory needle, a feed-dog intermittently projected through the work-support, an edge-guide disposed to direct an edge of a body-material within the range of lateral vibration of the needle, a presser Opposed to the feed-dog at the body-material side ef the edge-guide, an auxiliary-presser having a bead-chain guide- Way disposed to direct the bead-chain in juxtaposed relation with the edge of the body-material, supporting means upon said work-support for the auxiliary presser, and means for yieldingly urging said auxiliary presser in a direction toward the worksupport.

8. In a sewing machine having stitch-forming mechanism adapted to attach a beadchain to a body-material, a work-support, a

feeddog projected through the work-support and provided with two teeth conveniently spaced to receive therebetween during its feeding movement a portion of a bead of the bead-chain disposed upon t-he work-support in substantially the direction of seam formation, and a vpresser' yieldingly opposed to said eeddog and lifted clear of the bead-chain in advance of and by the interposed chainbead engaged by the feed-dog during the chain-advancing movement of said feed-dog.

9. In a sewing machine having stitchforming mechanism adapted to attach a beadchain to a body-material, a work-support, a feed-dog projected through the work-support and provided with two teeth conveniently spaced to receive therebetween during its feeding movement a portion of a bead of the bead-chain disposed upon the work-support in substantially the line of seam formation, a presser yieldingly opposed to said feed-dog and lifted clear o the bead-chain in advance of and by the interposed chain-bead engaged by the feed-dog during the chain-advancing movement of said feeddog, and means for feeding the body-material with an edge thereof in juxtaposed relation with the bead-chain.

10. In a sewing machine, an endwise reciprocatory and laterally vibratory needle, a work-support, means for guiding the edge of a body-material and a bead-chain past the stitch-forming mechanism in juxtaposed relation upon said work-support and within the range of the lateral vibration of the needle, work-feeding means including a feeddog engaging the chain-beads wccessively, and presser-devices opposed to said workteeding means comprising a presser yieldingly bearing upon the margin of the bodymaterial, and an auxiliary-presser yieldingly engaging the bead-chain.

l1. In a bead-chain sewing machine, stitchforming mechanism, a work-support including a throat-plate having a feed-dog slot, work-advancing means including a feed-dog operating through said slot, and a bead-chain guard closing said feed-slot between the rearward end of the feed-dog and the rearward end of said slot.

l2. In a bead-chain sewing machine, stitchforming mechanism, a work-support including a throat-plate having a feed-dog slot, work-advancing means including a feed-dog operating through said slot, and a bead-chain guard comprising a spring-plate closing the gap between the rearward end of the throatplate slot and the feed-dog yielding to the rlising and falling movements of said feedc og.

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

WALTER MYERS.

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