US933032A - Sewing-machine. - Google Patents

Sewing-machine. Download PDF

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US933032A
US933032A US50145609A US1909501456A US933032A US 933032 A US933032 A US 933032A US 50145609 A US50145609 A US 50145609A US 1909501456 A US1909501456 A US 1909501456A US 933032 A US933032 A US 933032A
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cam
needle
stud
shaft
arm
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Charles F Gray
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Singer Co
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Singer Co
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B19/00Programme-controlled sewing machines

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  • SEWING MACHINE SEWING MACHINE. urLxoA'rxox num Junn, noo.
  • SElVING-MACHINE CHARLES .F. GRAY, Sierra Madre, Cal., assigner to The Singer Manufacturing Company, a Corporation of New Jersey. Filed June 11, 1909. serial No. 501,456.
  • This invention relates to that class of stitching machines designed to produce both straight-away and zigzag stitching in a eontinaous seam ⁇ for closing shoe uppers, stitching patch pockets to garments and performing various operations upon overalls t l 1 l seems@ l page l 7162 SPECIFICATIONS OF PATENTS-AUGUST 31, 1909.
  • the present invention is not therefore directed broadly to needle-jogging mechanism capable of being changed at the will of the operator for producing either straight-away or zigzag stitching while the machine is in motion, nor is it addressed broadly to means for timing the changes between straight-away and zigzag stitching to any particular stitch of a series or succession of stitches or to any particular stage of a stitch-producing cycle; but it consists in certain specific devices for controlling the needle-jogging mechanism whereby the convenience and effectiveness of operation of machines of the class described are increased.
  • Figure I is a front side elevation of a machine embodying the present improvements
  • Fig. 2 a sectional plan view of the same taken partly through the axis of the main-shaft and partly through that of the cam-shaft and controlling rock-shaft.
  • Fig. 3 is a detail elevation of the needle ogging devices.
  • Fig. -t is a rear side elevation of the machine and Fig'. 5 a similar elevation showing the jog-controlling mechanism in a different position.
  • Figs. 6 and are rear face views of the controlling cam respectively in releasing and locking positions, and Figs. 8 and 9 are vertical sections through the same and the cam-shaft upon which they are mounted.
  • the machine is constructed with the usual bed-plate 1 with overhanging bracket-arm 2 upon the head 3 of which is disposed the horizontal fulcrum-stud t upon which is journaled the swinging needle-bar frame 5 provided in its lower portion with a transverse slot 6 to receive the headed guide-stud 7 upon the lower member of the head 3 of the bracket-arm.
  • the vertically reciprocating needle-bar 9 carrying the needle 10 and provided with the fixed collar 11 carrying a stud embraced by one end of the pitman 12 whose opposite end embraces a crank-pin upon the crank-plate 13 fixed upon the forward end of the mainshaft 14 which is journaled as usual in the bracket-arm and provided at its rearward end with the balance-wheel 15.
  • the needle 10 coperates with the rotary lock-stitch hook 16 mounted upon the transverse shaft 17 connected by suitable gearing with the longitudinal shaft, 18 mounted beneath the bed and driven by means of the belt 19 and sprocketwheels 20 froln the main-shaft 14:.
  • the camshaft carries the so-called triangular cam 24 which is embraced bythe parallel members 25 of a yoke 26 formed at the forward end of a. link-bar 27 pivotally connected at its rearward end by means of' the screw-pin 28 with a lug 29 upon the needle-frame 5.
  • the link-bar 27 receives vibratory movements upon its pivotal connection 28 from the actuating cam 24,but is free to move' endwise in relation to said cam.
  • the link-bar is provided adjacent its yoke 26 with a controlling stud 29 which is provided with suitable guiding means for determining its path of movement.
  • the guiding means comprises the swinging link 30, one end of which embraces the controllingr stud 29 of the linkbar 27 and the other end embraces a fulcrum-stud'3l carried by a lateral arm32 fixed upon the transverse rock-shaft 33 journaled in the rearward side of' the bracketarm parallel with the cam-shaft 23.
  • the rock-shaft is disposed slightly below and forwardly of the cam-shaft 23, and in such position that its axis is at substantially the same level, and preferably coincident with that of the controlling stud 29 when the linkbar 27 is in its extreme lower position.
  • the controlling rock-shaft 33 has fixed upon its rearward end the lateral crank-arm 34 forked at its outer end to embrace a pin 35 upon the forward end of a lever 36 fulcrumed upon the fixed stud 37 upon the bracket-arm and formed in its lower side with a socket 38 entered by the upper threaded end of a push-rod 39 provided with a SPECIFICATIONS or PATENTS-'AUGUST 31, 1909.
  • the fulcrum-stud 31 for the swinging link 30 is disposed upon an imaginary line joining the centers of the shaft 23 and pivotal screw-pin 28, so that the vibration of the' link-bar 27 carries the controlling stud 29 across such line at substantially right angles, and hence it receives no appreciable endwise motion through the guiding link 30; but when the arm 34 is drawn downwardly into the position represented in Fig. 5, the rocking of the shaft 33 carries the fulcrum-stud 31 above such imaginary line, whereby the link 30 is caused to swing across said line obliquely, thus producing an endwise movement of the link-bar 27 in addition. to its uniform side- Wise movement, this endwise movement being communicated to the swinging needleframe and producing jogging movements v of the needlein conjunction with its reciprocating movements.
  • the cam 24 is provided with outer and inner concentric portions or dwells a and b each covering an arc of substantially a quarter circumference, the extremities of these portions being joined by 'inclined actuating portions c and d.
  • the engagement of the concentric portions a and Z) with the embracing members 25 of the yoke 26 serves to retain the link-bar immovably in upper or lower position while the needle descends through the work and emerges therefrom, while the eccentric or live portions c and d accomplish the throw of the link-bar in one or ⁇ the other direction while the needle is out of the goods.
  • the movement of the link-bar to eXtreme lower position causes the link to overlie the fulcrum carrying arm 32, and their extremities to lie in substantially the same line, whereby the endwise position of the link-bar and hence the position of the needle is caused upon each alternate stitch to assume initial relation, regardless of the position of the arm 32 and the fulcrum-stud carried thereby.
  • the rear side vof the bracket-arm is shown provided with the spaced lugs and 46 in each of which is inserted a stop-screw 47 with lock-nut 48, the points of the upper and lower stop-screws being adapted to engage the upper and lower edges, respectively, of the spring-pressed lever 36 to limit respectively its upper or initial position and its lower or jog-stitch position, the range of movement of this lever determining that of the arm 34 of the rockshaft 33, and hence of the arm 32 and fulcrum-pin 31 carried thereby.
  • the rearward end of the cam-shaft 23 is formed with a cylindrical socket 49 within which is slidingly fitted the shank 50 of a controlling' cam-disk 51 having upon its inner or forward face two screw-pins 52 whose heads 53 are normally seated upon the bottoms of countersink holes 54 in a thrustcollar 55 secured upon the rearward end of the shaft 23 by means of set-screws 5G.
  • a spring 57 is interposed between the inner end of the shank 50 of the cam disk and the inner end of the socket 49, whereby the camdisk is yieldingly pressed into its extreme rearward position, which is determined by the heads of the stop-screws 52.
  • the outer or rearward face of the cam-disk 51 is shown provided with a diametrical groove or recess 5S having abrupt segmental side-walls concentric with the axis of motion of the cam-disk to form stop-shoulders 58a and laterally and outwardly inclined ends 53b ar- Pea f Ll vSPECIFICATIONS 0F PATENTS-AUGUST 31, 1909.
  • the lever arm 34 carries upon its front facea stud G0 which, in the normal elevated position ot' the arm 34, is disposed substantially" concentric with the cam-disk 51, and extends within the transverse groove or recess 58 therein.
  • the cam-disk 51 is so set upon the shaft 23 in relation to the actuating cam 24 that when the yoke 26 first reacliesthe limit of its extreme upper ⁇ or lower throw, and the needle is rising and its point is a little above the work, he groove 58 is substantially vertical, so as to permit the descent of the locking stud (50 from normal concentric position with the crank-arm 34, but as the cam-shaftl continues to rotate and the needle rises to itshighest position, the groove 58 is brought into varying' angular relations with the circular path of movement ,of the stud (30 upon the crank-arm 34, and serves to restrain the movement-of the latter' by one of its segmental stop-shoulders 58a 'until the cam-disk has made substantially a semi-rotation, and the transverse groove 58 again assumes substantially a vertical position as the yoke 2G attains its opposite extreme position, and the point of the needle is again above the work and rising to extreme elevated position, when the stud G0 is again
  • the reieaseof the treadlerod 44 permits the spring 42 to' press the levers 36 and 34 upwardly with the stud G0 resting against the periphery of the camdisk 51 until one ot' the beveled portions 59 of the disk encounters the stud 60, when the latter is permitted to ride up the same, thereby forcing aside the cam-disk until it enters the recess 58 and returns to normal position therein, when the cam-disk reassumes normal operative position, and the lever 34 is again intermittingly confined in initial straight-stitching position.
  • controlling or locking cam4 51 and its action upon the operating lever 34, is such that said lever is free to be manually operated through the treadle-rod 44 whenever the needle is raised above the work, regardless of its lateral position and that of the needletrame through which it receives its sidewise or jogging movements.
  • the actuation of the controlling lever 34 to shift the movable fulcrum 31 of the swinging link 30 may be properly effected at any time during the stitch-producing cycle while the link-bar 27 is in its lower position, corresponding with the straightaway stitching or depth-stitch position of the needle, as in such position of the linkbar 2T the ulcrum-pin 31 can move upon its carrying arm 32 only in a path concentric with the controlling stud 29.
  • the posit-ion of the lever 34 may be changed at any time while the point of the needle is above the work on either the depth stitch or edge stitch cycle without injuring the work or endangering the @Oss SPECIFICATIONS OF PATENTS'-AUoUs/r 31, 1909. 7165 breakage of the needle. It will therefore be apparent that only one side of the cam-disk 51 is essential to insure against the change between straight-away and zigzag stitching, and this is the side provided with the shoulder 58a and the corresponding external peripheral shoulder occupying a position at the lower ⁇ side of the groove 5S during the time when the link-bar 27 is in its upper position and the needle is in the work.
  • the particular form of the cam 51 is not thus material so long as it 'is provided with the inner and outer stop-shoulders and adjacent iuclines or cani portions for engaging respectively the sides and end of the stud (50 carried by the controlling lever 34; while it is equally immaterial which of these ⁇ interengaging parts is made Capable of yielding trans ⁇ versely'of the direction ot' operative movement of the'cam-disk, so long as they are adapted for relative yielding moveuunt whereby the one may thrust aside the other to permit the free movement of the lever I-l-lcrosswise of the direction ot' operative movement of the cam-disk after the stud (Si) has completed its normal period of engagement with the respective 'stop-shoulder ot' the cam member.
  • a locking 'plate 61 is mountedlat one end upon the fulcrum-stud 3T and is provided intermediate its ends with a transverse slot (S)- entered by the'e-lamp-screw G3 tapped into the lever 36.
  • the swinging member 5 in which is journaled the reciprocating needle-bar as a needle-frame but it is to be understood that by the term needle-frame is intended any equivalent sidewise moving member so connected with the needle as to communicate thereto its sidewise orjogging movements.
  • the needle has in some instances been carried by the needle-bar journaled in Y a laterally swinging needle-frame, as in the present construction, and in other cases the needle has been directly carried by a sidewise movable frame or carrier mounted upon a rectilinearly reciprocating needle-bar not partaking of the sidewise or jogging movements of such frame or carrier.
  • the nature of the connection between the jogging mechanism and the needle is not material, it is to be understood that this improvement is equally adapted to either of these prior forms of construction.
  • the combination with stitch-forming mechanism “comprising a reciprocating needle, a cooperating looptaker and actuating means for saidneedle and loop-taker, continuously acting means for imparting lateral jogging movements to said needle, and a controller acting on the needle-jogging means whereby the effective action of the needle-jogging means may be neutralized, of interengaging parts comprising a cam-member carried by a moving part of the machine and comprising a stopshoulder and an adjacent relatively inclined cam-portion, and a stud'movable with said controller relatively to said cam-member and adapted for positive engagement with said stop-shoulder and yielding engagement with the adjacent cam-portion of the cam-member, one of said inter-engaging parts being mounted to yield transversely of the directions of normal movement of both so as to permit one to freely pass the other under the. action of said inclined cam portion of the cam-member with the stud.
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker and actuating means for said needle and loop-taker, continuously acting ⁇ means for imparting lateral jogging movements to said needle, and a controller acting on the needle-jogging means whereby the effective action of the needle-jogging means may be neutralized, of a cam-member yieldingly mounted upon a moving part of the machine and comprising a stop-shoulder and an adjacent relatively inclined cam-portion, and a stud movable with said controller relatively to said cam member and adapted for engagement with said stop-shoulder and adjacent cam-portion of the cam-member.
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, continuously acting means including a rotary actuating cam for imparting lateral jogging movements to said needle, and a controller acting on the needle jogging means whereby the effective action of the needle-jogging means may be neutralized, of a rotary cam-member movable with and circularly adjustable in relation to said page, Ca
  • actuating cam and comprising a stop-shoul- 'i of said cam, a second axially yielding cam der and an adjacent relatively inclined camportion, and a stud movable with said controller relatively to said cam-member and adapted for positive engagement with said stop-shoulder and yielding engagement with the adjacent cam-portion of the cam-member.
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a coperating looptaker and actuating means for said needle and loop-taker, continuously acting means including arotary actuating cam for imparting lateral jogging movements to said needle, and a controller acting on the needlejogging means whereby the effective action of the needle-jogging means may be neutralized, of an axially yielding rotary cammember movable with and circular-ly adjustable in relation to said actuating cam and comprising a stop-shoulder and an adjacent relatively inclined cam-portion, and a stud movable with said controller relatively to said cam-member and adapted for engagement with said stop-shoulder and adjacent cam-portion of the cam-member.
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker and actuating means for said needle and loop-taker, continuously acting means for imparting lateral jogging movements to said needle, and a controller including a vibratory lever acting on the needle-jogging means whereby the effective action ot' the needle-jogging means may be neutralized, of a cam-member yieldingly mounted upon a moving part of the machine and comprising a -stop-shoulder and an adjacent relatively inclined cam-portion, and a'stud carried by said vibratory lever and adapted for engagement with said stop-shoulder and adjacent cam-portion of the Cain-member.
  • a sewing machine comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needleframe, a rotary cam-shaft, means for imparting to said cam-shaft a single rotation for each two complete reciprocations of the needle, an actuating cam on the camshaft, a link-bar pivotally connected at one end with the needle-frame and deriving swinging movements from said cam, a controlling st-ud upon said link-bar, a rock-shaft parallel with said cam-shaft and disposed in substantial alinement with the said controlling stud in one of the extreme positions of said link-bar, guiding means for said controlling stud connected to said rock-shaft and adapted to determine the direction of movement of the link-bar under the action upon said cam-shaft provided with a radial groove having abruptly shouldered sidewalls and reversely inclined end merging into the side face of the cam-member, an arm upon said rock
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, continuously act-ing means for imparting jogging movements to said needleframe, andmeans connected with said needle-frame jogging means whereby the effective action of the-needle-frame jogging means may be neutralized; and comprising a ⁇ rock-lever, a rotary cam-disk 'formed with a radial groove having an outwardly and laterally beveled end portion and convergent bevel upon the periphery, said beveled portions of the cam-disk being arranged at an inclination to the axis of movement of the latter, means for imparting to said cam one rotation for each complete to-and-fro jogging movement of the needle-frame, a stud mounted upon said rock-lever to enter said cam-groove and yieldingly engage its outwardly inclined end
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, continuously acting means for imparting jogging movements to said needle-frame, and means connected with said needle-frame jogging means whereby the effective action of the needle-frame jogging means may be neutralized; and comprising a rock-lever, a rotary axially-yielding camdisk formed with a diametrical groove with outwardly and laterally beveled end portions and convergent bevels upon the periphery ⁇ said beveled portions of the eamdisk being arranged at an inclination to the axis of movement of the latter ⁇ means for imparting to said cam one rotation for each complete to-and-fro jogging movement of the needle-frame, a stud mounted upon said rock-lever to enter said cam-groove, and means for shifting said rock-lever
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, an endwise movable link-bar pivotally connected at one end with the @enfle-t 3i Fidi needle-frame ⁇ means for impart-ing to said link-bar uniformlateral movements about its pivot of which one in each direction is e'ected for every complete reciprocation of the needle, guiding means to determine the direction of movement of said link-bar under the action of its swinging means, a. controlling rock-shaft by which said guiding means are carried, an arm fixed upon said rock-shaft and provided with means for moving it, and an adjustable stop for determining the throw of the rock-shaft arm.
  • the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, a rotary cam-shaft, means for imparting to said cam-shaft a single rotation for each two complete reciprocations of the needle, a cam on the cam-shaft, a linkbar pivotally connected at one end with the needle-frame and having at its opposite end a. yoke embracing said cam, a swinging link pivotally connected to said link-har near said yoke, a rock-shaft parallelwith said cam-shaft.

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Description

C. F. GRAY.
SEWING MACHINE. urLxoA'rxox num Junn, noo.
Patented Aug. 31, 1909.
i @Riffs-SHEET l.
CO'IIG. Illlllltl'llll.
. gaat@ enne? i @55,03@ @agit 933,032. SElVING-MACHINE. CHARLES .F. GRAY, Sierra Madre, Cal., assigner to The Singer Manufacturing Company, a Corporation of New Jersey. Filed June 11, 1909. serial No. 501,456.
T o (LIZ whom it may concern:
Be it known that I, CHARLES F. GRAY, a citizen of the United States, residing at Sierra Madre, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the aceon'ipz-inying drawings.
This invention relates to that class of stitching machines designed to produce both straight-away and zigzag stitching in a eontinaous seam` for closing shoe uppers, stitching patch pockets to garments and performing various operations upon overalls t l 1 l seems@ l page l 7162 SPECIFICATIONS OF PATENTS-AUGUST 31, 1909.
and other articles of clothing to which this class of combination seam is particularly applicable. Y
As shown and described inthe United States patents to Thomas IV. Morrison, No. 216,289, dated J une 10, 1879, and Thomas F. Hart and George S. Hill, No. 406,277, dated July 2, 1889, it has long been. common to construct sewing machines for producing combined straight-away and zigzag seams by the use of a jogging needle with controlling means for throwing into and out of operation the needle-jogging means, devices being employed for preventing the change between straight-away and zigzag stitching excepting upon a particular stitch of a series or succession of stitches and at astage of the stitch-producing cycle in which the point ofthe needle was out of the work; so that the straight-away stitching would be invariably produced in alinement with the same one of the extreme needle punctures of the zigzag stitching, and the change from one to the other kind of stitching would be accomplished at a time when the work could not be injured or the needle broken by lateral movement of the needle while in the fabric. The present invention is not therefore directed broadly to needle-jogging mechanism capable of being changed at the will of the operator for producing either straight-away or zigzag stitching while the machine is in motion, nor is it addressed broadly to means for timing the changes between straight-away and zigzag stitching to any particular stitch of a series or succession of stitches or to any particular stage of a stitch-producing cycle; but it consists in certain specific devices for controlling the needle-jogging mechanism whereby the convenience and effectiveness of operation of machines of the class described are increased. In the accompanying drawings, Figure I is a front side elevation of a machine embodying the present improvements, and Fig. 2 a sectional plan view of the same taken partly through the axis of the main-shaft and partly through that of the cam-shaft and controlling rock-shaft. Fig. 3 is a detail elevation of the needle ogging devices. Fig. -t is a rear side elevation of the machine and Fig'. 5 a similar elevation showing the jog-controlling mechanism in a different position. Figs. 6 and are rear face views of the controlling cam respectively in releasing and locking positions, and Figs. 8 and 9 are vertical sections through the same and the cam-shaft upon which they are mounted.
The machine is constructed with the usual bed-plate 1 with overhanging bracket-arm 2 upon the head 3 of which is disposed the horizontal fulcrum-stud t upon which is journaled the swinging needle-bar frame 5 provided in its lower portion with a transverse slot 6 to receive the headed guide-stud 7 upon the lower member of the head 3 of the bracket-arm. In the lateral bearing members 8 of the needle-bar fra-me 5 is journaled the vertically reciprocating needle-bar 9 carrying the needle 10 and provided with the fixed collar 11 carrying a stud embraced by one end of the pitman 12 whose opposite end embraces a crank-pin upon the crank-plate 13 fixed upon the forward end of the mainshaft 14 which is journaled as usual in the bracket-arm and provided at its rearward end with the balance-wheel 15.`
As herein represented the needle 10 coperates with the rotary lock-stitch hook 16 mounted upon the transverse shaft 17 connected by suitable gearing with the longitudinal shaft, 18 mounted beneath the bed and driven by means of the belt 19 and sprocketwheels 20 froln the main-shaft 14:.
Upon the main-shaft 14 is fixed the angular gear-wheel 2l meshing with the larger angular gear 22 fixed upon the transverse cam-shaft 23 which is thus rotated at onehalf the speed of the main-shaft. The camshaft carries the so-called triangular cam 24 which is embraced bythe parallel members 25 of a yoke 26 formed at the forward end of a. link-bar 27 pivotally connected at its rearward end by means of' the screw-pin 28 with a lug 29 upon the needle-frame 5.
As will be observed, the link-bar 27 receives vibratory movements upon its pivotal connection 28 from the actuating cam 24,but is free to move' endwise in relation to said cam. In order that the sidewise actuation imparted by the cam may be partially converted into endwise movement, the link-bar is provided adjacent its yoke 26 with a controlling stud 29 which is provided with suitable guiding means for determining its path of movement.
As herein shown, the guiding means comprises the swinging link 30, one end of which embraces the controllingr stud 29 of the linkbar 27 and the other end embraces a fulcrum-stud'3l carried by a lateral arm32 fixed upon the transverse rock-shaft 33 journaled in the rearward side of' the bracketarm parallel with the cam-shaft 23. The rock-shaft is disposed slightly below and forwardly of the cam-shaft 23, and in such position that its axis is at substantially the same level, and preferably coincident with that of the controlling stud 29 when the linkbar 27 is in its extreme lower position.
The controlling rock-shaft 33 has fixed upon its rearward end the lateral crank-arm 34 forked at its outer end to embrace a pin 35 upon the forward end of a lever 36 fulcrumed upon the fixed stud 37 upon the bracket-arm and formed in its lower side with a socket 38 entered by the upper threaded end of a push-rod 39 provided with a SPECIFICATIONS or PATENTS-'AUGUST 31, 1909.
page 3 thrust-nut 40 between which and the guiding l out the production of consecutive stitches boss 41 of the bracket-arm is interposed a spring 42 by means of which the arm 36, and consequently the arm 34, is yieldingly maintained in raised position. The crank-arm 34 is provided with a lug 43 having an eye in which is hooked the upper end ofthe treadlerod 44, adapted 'for drawing such arm downwardly to rock the shaft 33 in opposition to the spring 42.
When the arm 34 is in its normal or upper position, as represented in Fig. 4, the fulcrum-stud 31 for the swinging link 30 is disposed upon an imaginary line joining the centers of the shaft 23 and pivotal screw-pin 28, so that the vibration of the' link-bar 27 carries the controlling stud 29 across such line at substantially right angles, and hence it receives no appreciable endwise motion through the guiding link 30; but when the arm 34 is drawn downwardly into the position represented in Fig. 5, the rocking of the shaft 33 carries the fulcrum-stud 31 above such imaginary line, whereby the link 30 is caused to swing across said line obliquely, thus producing an endwise movement of the link-bar 27 in addition. to its uniform side- Wise movement, this endwise movement being communicated to the swinging needleframe and producing jogging movements v of the needlein conjunction with its reciprocating movements.
As willbe observed, the cam 24 is provided with outer and inner concentric portions or dwells a and b each covering an arc of substantially a quarter circumference, the extremities of these portions being joined by 'inclined actuating portions c and d. As will be observed, the engagement of the concentric portions a and Z) with the embracing members 25 of the yoke 26 serves to retain the link-bar immovably in upper or lower position while the needle descends through the work and emerges therefrom, while the eccentric or live portions c and d accomplish the throw of the link-bar in one or` the other direction while the needle is out of the goods. In any case, according to the arrangement shown in the drawings, the movement of the link-bar to eXtreme lower position causes the link to overlie the fulcrum carrying arm 32, and their extremities to lie in substantially the same line, whereby the endwise position of the link-bar and hence the position of the needle is caused upon each alternate stitch to assume initial relation, regardless of the position of the arm 32 and the fulcrum-stud carried thereby. By this construction and arrangement of parts it will be seen that in the initial or neutral position of the fulcrum-stud 31 in which the link-bar 27 receives no appreciable endwise movement, the needle-bar is maintained in initial or straight-away stitching position throughand when the arm 32 is shifted to throw the fulcrum-stud 31 out of alinement with the cam-shaft and pivotal pin 28, the needleframe will still assume initial or straightaway stitching position when the link-bar is in its extreme lower position, but will be drawn inwardly into what may be termed edge-stitch position, when the -link-bar is thrown into upper extreme position. This is true regardless of the position in which the fulcrum-stud 31 is set for a given width of zigzag stitch or overseam, because the rockshaft 33 constituting the fulcrum of the arm 32 is in substantial alinement with the controlling stud 29 in one of its extremepositions, so that the fulcrum-stud 31 is always shifted in an arc concentric with such position of which the swinging link 30 forms a radius in the same extreme position of the link-bar 27. For this reason, when the linkbar is in the extreme lower position to which it is thrown by the cam 24, the rocking of the shaft 33 to shift the fnlcrum-carrying arm 32 produces no effect upon the position of the link-bar 27, as the members 30 and 32 overlie each other and the pivotal points of their ends remain substantially coincident in all positions of the fulerum-stud 31.
In order to regulate the range of movement of the lever-arm 34, the rear side vof the bracket-arm is shown provided with the spaced lugs and 46 in each of which is inserted a stop-screw 47 with lock-nut 48, the points of the upper and lower stop-screws being adapted to engage the upper and lower edges, respectively, of the spring-pressed lever 36 to limit respectively its upper or initial position and its lower or jog-stitch position, the range of movement of this lever determining that of the arm 34 of the rockshaft 33, and hence of the arm 32 and fulcrum-pin 31 carried thereby.
The rearward end of the cam-shaft 23 is formed with a cylindrical socket 49 within which is slidingly fitted the shank 50 of a controlling' cam-disk 51 having upon its inner or forward face two screw-pins 52 whose heads 53 are normally seated upon the bottoms of countersink holes 54 in a thrustcollar 55 secured upon the rearward end of the shaft 23 by means of set-screws 5G. A spring 57 is interposed between the inner end of the shank 50 of the cam disk and the inner end of the socket 49, whereby the camdisk is yieldingly pressed into its extreme rearward position, which is determined by the heads of the stop-screws 52. The outer or rearward face of the cam-disk 51 is shown provided with a diametrical groove or recess 5S having abrupt segmental side-walls concentric with the axis of motion of the cam-disk to form stop-shoulders 58a and laterally and outwardly inclined ends 53b ar- Pea f Ll vSPECIFICATIONS 0F PATENTS-AUGUST 31, 1909.
ranged at an angle with the axis of motion of the cam-disk convergent with the beveled edge portions 5.9 of the cam-disk whose outer periphery is otherwise cylindrical so as to form externally of said recess segmental stop-shoulders circularly coextensive with the shoulders 58a, as indicated in Figs. 6, 7 and 9. The lever arm 34 carries upon its front facea stud G0 which, in the normal elevated position ot' the arm 34, is disposed substantially" concentric with the cam-disk 51, and extends within the transverse groove or recess 58 therein. The cam-disk 51 is so set upon the shaft 23 in relation to the actuating cam 24 that when the yoke 26 first reacliesthe limit of its extreme upper `or lower throw, and the needle is rising and its point is a little above the work, he groove 58 is substantially vertical, so as to permit the descent of the locking stud (50 from normal concentric position with the crank-arm 34, but as the cam-shaftl continues to rotate and the needle rises to itshighest position, the groove 58 is brought into varying' angular relations with the circular path of movement ,of the stud (30 upon the crank-arm 34, and serves to restrain the movement-of the latter' by one of its segmental stop-shoulders 58a 'until the cam-disk has made substantially a semi-rotation, and the transverse groove 58 again assumes substantially a vertical position as the yoke 2G attains its opposite extreme position, and the point of the needle is again above the work and rising to extreme elevated position, when the stud G0 is again free to move downwardly with its supporting arm r34 1n shifting the ulcrum-stud 31 for effecting the change between straightaway and zigzag stitching conditions` "S/Then the yielding cam 51 is in releasing position, as indicated in F ig. (5, the drawing down ot the lever-arm 34 causes the stud (-O in its descent to 4engage the inclined end portion 58 ot the groove 58, thereby causing the thrusting aside of the cam-disk in opposition to its spring 57, but the continued descent ot' the stud past the transverse cam-rib afforded by the convergently beveled portions 58b and 59 permits the cam to return under the action of the spring 57 into its normal position, the stop-shoulder afforded by the angular edge of the cam-disk locking the stud G() in its lower position and preventing the immediate return ofthe arm 34, to initial straight-away stitching position under the action of its returning spring 42.
The restraining and releasing action ofthe lever-arm 34 just described is obviously due to the construction and relation of t-he component parts of the yielding cam-disk 51 which rotates with the actuating cam 24 and g' the stud 60 constituting the follower therefor which has a segmental path of movement in a plane at right angles to the axis ot A movement of the cam-disk. Asthe path of movement of the stud 60 is thus substantially at right angles to the stop-shoulders afforded by the cylindrical walls 58a of the recess 58 and the cylindrical peripheral portion extending through a corresponding arc, it is evident that these parts have a positive engagement without producing any tendency to relative lateral movement transversely of their normal directions of movement; but as the end portions of the recess or depression 58 of the Cain-disk andthe convergent peripheral bevels 59 are inclined both to the axis of movement of the cam-disk and the path of movement of the stud 60 upon its Carrying arm 34, the engagement of the stud with the cam-shoulders 58b or 59 is of a yielding character, owing to the yielding relation of the cam-disk 51 to its supporting and actuating cam-shaft 23, whereby a relative lateral movement is produced bet-ween such interengaging parts in opposition to the action of the spring 57.
Then it is desired to change from the zigzag stitching position of the parts represented in Fig. 5, the reieaseof the treadlerod 44 permits the spring 42 to' press the levers 36 and 34 upwardly with the stud G0 resting against the periphery of the camdisk 51 until one ot' the beveled portions 59 of the disk encounters the stud 60, when the latter is permitted to ride up the same, thereby forcing aside the cam-disk until it enters the recess 58 and returns to normal position therein, when the cam-disk reassumes normal operative position, and the lever 34 is again intermittingly confined in initial straight-stitching position. It will be observed that the construction of the controlling or locking cam4 51, and its action upon the operating lever 34, is such that said lever is free to be manually operated through the treadle-rod 44 whenever the needle is raised above the work, regardless of its lateral position and that of the needletrame through which it receives its sidewise or jogging movements.
From the foregoing description, itwill be seen that the actuation of the controlling lever 34 to shift the movable fulcrum 31 of the swinging link 30 may be properly effected at any time during the stitch-producing cycle while the link-bar 27 is in its lower position, corresponding with the straightaway stitching or depth-stitch position of the needle, as in such position of the linkbar 2T the ulcrum-pin 31 can move upon its carrying arm 32 only in a path concentric with the controlling stud 29. It is equally evident that the posit-ion of the lever 34 may be changed at any time while the point of the needle is above the work on either the depth stitch or edge stitch cycle without injuring the work or endangering the @Oss SPECIFICATIONS OF PATENTS'-AUoUs/r 31, 1909. 7165 breakage of the needle. It will therefore be apparent that only one side of the cam-disk 51 is essential to insure against the change between straight-away and zigzag stitching, and this is the side provided with the shoulder 58a and the corresponding external peripheral shoulder occupying a position at the lower `side of the groove 5S during the time when the link-bar 27 is in its upper position and the needle is in the work. The particular form of the cam 51 is not thus material so long as it 'is provided with the inner and outer stop-shoulders and adjacent iuclines or cani portions for engaging respectively the sides and end of the stud (50 carried by the controlling lever 34; while it is equally immaterial which of these` interengaging parts is made Capable of yielding trans` versely'of the direction ot' operative movement of the'cam-disk, so long as they are adapted for relative yielding moveuunt whereby the one may thrust aside the other to permit the free movement of the lever I-l-lcrosswise of the direction ot' operative movement of the cam-disk after the stud (Si) has completed its normal period of engagement with the respective 'stop-shoulder ot' the cam member.
It is evident that, unless the lever 3a'- is rocked to change the position'of the fulcrumstud 31, the machine is adapted for producing plain stitching. In case it is desired to lock the parts in sach manner as to produce zigzag or oversean'i stitching only, it is merely necessary to depress the levers 3 and 3G and to lock them in this position. According to the present invention, a locking 'plate 61 is mountedlat one end upon the fulcrum-stud 3T and is provided intermediate its ends with a transverse slot (S)- entered by the'e-lamp-screw G3 tapped into the lever 36. The lever 36 having been shifted into jogging position as before def-:cribed` the .clamp-screw 63 is loosened and the tree end of the locking plate G1 is set in contact with the lug 45 or adjusting screw 47 and the clamp-screw retightened, by which means the lever 3G is prevented from rising under the action ot' its spring 42, as indicated in dotted lines in Fig. 5.
I have herein referred to the swinging member 5 in which is journaled the reciprocating needle-bar as a needle-frame but it is to be understood that by the term needle-frame is intended any equivalent sidewise moving member so connected with the needle as to communicate thereto its sidewise orjogging movements. In previous structures, 'the needle has in some instances been carried by the needle-bar journaled in Y a laterally swinging needle-frame, as in the present construction, and in other cases the needle has been directly carried by a sidewise movable frame or carrier mounted upon a rectilinearly reciprocating needle-bar not partaking of the sidewise or jogging movements of such frame or carrier. As, according to the presentinvention the nature of the connection between the jogging mechanism and the needle is not material, it is to be understood that this improvement is equally adapted to either of these prior forms of construction.
Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, the combination with stitch-forming mechanism "comprising a reciprocating needle, a cooperating looptaker and actuating means for saidneedle and loop-taker, continuously acting means for imparting lateral jogging movements to said needle, and a controller acting on the needle-jogging means whereby the effective action of the needle-jogging means may be neutralized, of interengaging parts comprising a cam-member carried by a moving part of the machine and comprising a stopshoulder and an adjacent relatively inclined cam-portion, and a stud'movable with said controller relatively to said cam-member and adapted for positive engagement with said stop-shoulder and yielding engagement with the adjacent cam-portion of the cam-member, one of said inter-engaging parts being mounted to yield transversely of the directions of normal movement of both so as to permit one to freely pass the other under the. action of said inclined cam portion of the cam-member with the stud.
2. In a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker and actuating means for said needle and loop-taker, continuously acting `means for imparting lateral jogging movements to said needle, and a controller acting on the needle-jogging means whereby the effective action of the needle-jogging means may be neutralized, of a cam-member yieldingly mounted upon a moving part of the machine and comprising a stop-shoulder and an adjacent relatively inclined cam-portion, and a stud movable with said controller relatively to said cam member and adapted for engagement with said stop-shoulder and adjacent cam-portion of the cam-member.
3. In a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, continuously acting means including a rotary actuating cam for imparting lateral jogging movements to said needle, and a controller acting on the needle jogging means whereby the effective action of the needle-jogging means may be neutralized, of a rotary cam-member movable with and circularly adjustable in relation to said page, Ca
7166 SPECIFICATIONS OF PATENTS-AUGUST 31, 1909.
actuating cam and comprising a stop-shoul- 'i of said cam, a second axially yielding cam der and an adjacent relatively inclined camportion, and a stud movable with said controller relatively to said cam-member and adapted for positive engagement with said stop-shoulder and yielding engagement with the adjacent cam-portion of the cam-member. A
4. In a `sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a coperating looptaker and actuating means for said needle and loop-taker, continuously acting means including arotary actuating cam for imparting lateral jogging movements to said needle, and a controller acting on the needlejogging means whereby the effective action of the needle-jogging means may be neutralized, of an axially yielding rotary cammember movable with and circular-ly adjustable in relation to said actuating cam and comprising a stop-shoulder and an adjacent relatively inclined cam-portion, and a stud movable with said controller relatively to said cam-member and adapted for engagement with said stop-shoulder and adjacent cam-portion of the cam-member.
5. In a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker and actuating means for said needle and loop-taker, continuously acting means for imparting lateral jogging movements to said needle, and a controller including a vibratory lever acting on the needle-jogging means whereby the effective action ot' the needle-jogging means may be neutralized, of a cam-member yieldingly mounted upon a moving part of the machine and comprising a -stop-shoulder and an adjacent relatively inclined cam-portion, and a'stud carried by said vibratory lever and adapted for engagement with said stop-shoulder and adjacent cam-portion of the Cain-member.
6.111 a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needleframe, a rotary cam-shaft, means for imparting to said cam-shaft a single rotation for each two complete reciprocations of the needle, an actuating cam on the camshaft, a link-bar pivotally connected at one end with the needle-frame and deriving swinging movements from said cam, a controlling st-ud upon said link-bar, a rock-shaft parallel with said cam-shaft and disposed in substantial alinement with the said controlling stud in one of the extreme positions of said link-bar, guiding means for said controlling stud connected to said rock-shaft and adapted to determine the direction of movement of the link-bar under the action upon said cam-shaft provided with a radial groove having abruptly shouldered sidewalls and reversely inclined end merging into the side face of the cam-member, an arm upon said rock-shaft, a stud upon said arm of the rock-shaft adapted to normally enter said groove in the second-named cam, and means for rocking said rock-shaft.
7. In a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, continuously act-ing means for imparting jogging movements to said needleframe, andmeans connected with said needle-frame jogging means whereby the effective action of the-needle-frame jogging means may be neutralized; and comprising a` rock-lever, a rotary cam-disk 'formed with a radial groove having an outwardly and laterally beveled end portion and convergent bevel upon the periphery, said beveled portions of the cam-disk being arranged at an inclination to the axis of movement of the latter, means for imparting to said cam one rotation for each complete to-and-fro jogging movement of the needle-frame, a stud mounted upon said rock-lever to enter said cam-groove and yieldingly engage its outwardly inclined end portion and peripheral bevel, and means for shifting said rocklever.
8. In a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, continuously acting means for imparting jogging movements to said needle-frame, and means connected with said needle-frame jogging means whereby the effective action of the needle-frame jogging means may be neutralized; and comprising a rock-lever, a rotary axially-yielding camdisk formed with a diametrical groove with outwardly and laterally beveled end portions and convergent bevels upon the periphery` said beveled portions of the eamdisk being arranged at an inclination to the axis of movement of the latter` means for imparting to said cam one rotation for each complete to-and-fro jogging movement of the needle-frame, a stud mounted upon said rock-lever to enter said cam-groove, and means for shifting said rock-lever.
S). In a sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, an endwise movable link-bar pivotally connected at one end with the @enfle-t 3i Fidi needle-frame` means for impart-ing to said link-bar uniformlateral movements about its pivot of which one in each direction is e'ected for every complete reciprocation of the needle, guiding means to determine the direction of movement of said link-bar under the action of its swinging means, a. controlling rock-shaft by which said guiding means are carried, an arm fixed upon said rock-shaft and provided with means for moving it, and an adjustable stop for determining the throw of the rock-shaft arm.
10. In a Sewing machine, the combination with stitch-forming mechanism comprising a reciprocating needle, a cooperating looptaker, and actuating means for said needle and loop-taker, of a laterally movable needle-frame, a rotary cam-shaft, means for imparting to said cam-shaft a single rotation for each two complete reciprocations of the needle, a cam on the cam-shaft, a linkbar pivotally connected at one end with the needle-frame and having at its opposite end a. yoke embracing said cam, a swinging link pivotally connected to said link-har near said yoke, a rock-shaft parallelwith said cam-shaft. and disposed in substantial alinementl with the pivotal connection of the swinging link to the link-har in one ot the latters extreme positions., an arm fixed upon said rock-shaft, a fulCrum-stud upon said arm for said swinging link, a second arm fixed upon said rock-shaft, means applied thereto for rocking said shaft, and adjustable stops wherebyv the range oi movement of the second-named rock-shaft arm in both directions may be limited.
In testimony whereof, l have signed my name to this specification, in the presence of two subscribing witnesses.
W itnesses:
,5. ll. Smrroun,
A. S. MEAD.
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