US1830126A

US1830126A - Zigzag-stitch sewing machine

Info

Publication number: US1830126A
Application number: US483828A
Authority: US
Inventors: Myers Walter
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1930-09-23
Filing date: 1930-09-23
Publication date: 1931-11-03
Anticipated expiration: 1948-11-03
Also published as: GB360231A; DE551127C

Description

Nov. 3, 1931. w. MYERS 1,

ZIGZAG STITCH SEWING MACHINE Filed Sept. 23. 1930 3 Sheets-Sheet 1 swan/Mic:

"ZZZ/er @613 3% 3, 1931. w. MYERS 5 7 ZIGZAG STITCH SEWING MACHINE Filed Sept. 23, 1930 3 Sheets-Sheet 2 gwomtow Wall er M ens Nov. 3, 1931. w. MYERS ZIGZAG S TITCH SEWING MACHINE s Sheets-Sheet 3 Filed .Sept. 25, 1930 gwumtoc Walla er @8719 Patented Nov. 3, 1931 UNITED s'm'ras PATENT OFFICE WALTER MYERS, OF BRIDGEPORLT, CONNECTICUT, .ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, 01 ELIZABETH, NEW JERSEY, .A. CORPORATION 01 NEW JERSEY ZIGZAG-STITCH SEWING MACHINE Application filed September 23, 1980. Serial No. 483,528.

This invention relatesto improvements in zigzag stitch sewing machines of the type having an endwise reciprocatory needle capable of lateral vibratory movements with respect to a zero or neutral path of non-vibration of the needle.

The primary object of the present invention is to provide convenient means for quickly and accurately changing the zero or neutral path of non-vibration of the needle from one position to another and more particularly for changing the zero or neutral needle-path from a position in the central line of the zigzag stitches to a position at one side of the zigzag stitches, and vice versa.

A further object of the invention is to pro vide improved means for maintaining constant the extreme range of needle vibration in a predetermined field when changing the position of the zero path of the needle.

The foregoing and other objects and advantages in view, together with means whereby the same may be carried into effect, will best be understood from the following description of a preferred embodiment thereof illustrated in the accompanying drawings, 1n which: I I

Fig. 1 is a longitudinal sectional View, partly in front elevation, of a sewing machine having the improved needle-path controlling means. Fig. 2 is a detail view from the face-plate side of the upper portion of the machine bracket-arm head. Fig. 3 is a sectional view substantially on the line 3-3 of Fig. 1. Fig. 4 illustrates the needle-path and needle-throw controlling members, enlarged to full size as viewed from the left in Fig. 1, with the needle-path controlling member in the osition determining the zero or neutral path of the needle at one side of the zigzag stitches, and with the needle-throw controlling member shown in full lines in the position determining non-vibration of the needle, the dotted line position of the needlethrow controlling member being that wherein the needle has its maximum lateral throw. Fig. 5 is a view similar to Fig. 4, but with the needle-path controlling member in the position determining the zero or neutral path of the needle at the center of the zigzag stitches and the needle-throw controlling member in the full and dotted line positions which respectively determine non-vibration and maximum vibration of the needle. Fig. 6 is an enlarged sectional view substantially on the line 66 of Fig. 1. Figs. 7 and 8 are diagrammatic views illustrating the operation of the needlevibratin connections according to the positions 0% the controlling members as illustrated in Figs. 4 and 5, respectively. Fig. 9 illustrates the seams produced in the positions of the parts corresponding to Figs. 7 and 8.

The present invention is in the nature of an improvement in the embroidering machine forming the subject of the U. S. patent ap plication Serial No. 318,174, filed Nov. 9, 1928, by George M. Eames, but it will be obvious that the invention is readily adaptable for use with other needle vibrating mechanisms, as for instance that disclosed in the Eames et al. U. S. Patent No. 1,196,534, Aug. 29, 191

Referring to the drawings, the sewing machine comprises a cloth-plate 1, from which rises the hollow standard 2 of a tubular, overhanging bracket-arm 3, which terminates at its free end in a head 4. The front side of the bracket-arm standard 2 is formed with an opening closed by a detachable cover-plate 5 to provide for ready access to the mechanism within the bracket-arm, the top of the bracket-arm and the free end thereof being as usual, provided with the cover-plate 6 and the face-plate 7.

Suitably journaled in the bracket-arm 3 is the main actuating shaft 8, carrying at one end the combined balance-wheel and belt-pulley 9. At its opposite end, the shaft 8 carries a crank-disk 10, in which is secured a crank-pin 11 connected by means of a link 12 with a pin 13 extending laterally from a collar 14 rigidly clamped upon a needle-bar 15. The needle-bar 15 is journaled for endwise reciprocation in vertically alined apertures provided in spaced bearing lugs 16 and 17 of a vibratory frame 18, journaled at its upper end upon a'fulcrum-pin 19 for swinging movements in directions substantially transverse to the axis of rotation of the shaft 8, i. e., substantially transverse to the longitudinal direction of the cloth-plate 1. The fulcrum-pin 19 has a reduced extension 20 which is eccentric to the journal-axis of the frame 18 and is adjustably secured within a split bushing 21 in an aperture in the head 4, by means of a screw 22. At its lower end, the needle-bar 15 carries a needle 23.

Journaled for vertically directed movements in the head 4 is a tubular presser-bar 24, carrying at its lower end a presser-foot 25 opposed to a throat-plate 26. The throatplate 26 has the usual needle-slot 27 and is secured upon the clothlate 1 in the manner more fully disclosed in the before mentioned patent application Serial No. 318,174, to which reference may also be had for details of construction of the presser-foot mechanism.

Fixed upon the main shaft 8 is a bevelwear 28 in mesh with a similar gear 29 of one half the size of its driving gear and carried by the upper end of a vertically-disposed connecting shaft 30. The shaft 30 is journaled in suitable bearings provided within the standard 2 and carries at its lower end a bevel-gear 31 driving a similar gear 32 upon one end of a loop-taker shaft 33 'ournaled in suitable bearln lugs below t e clothplate 1. The sha t 33 carries a loop-taker 34, which in the present case is of the rotaryhock type and may be of any suitable construction.

For the purpose of laterally vibrating the needle, the inner face of the needle-bar frame bearing-lug 17 is grooved to receive a slideblock 35 suitably secured upon a crank-arm 36 upon the forward end of a rock-shaft 37 disposed below and substantially parallel to the main-shaft 8. Clamped by a screw 38 upon the rearward end of the rock-shaft 37 is the split hub 39 of a crank-arm 40 pivotally connected with the upper end of a link 41 of which the lower end is joined in like manner to one arm of a two-armed lever 42. The lever 42 is journaled between its ends upon a fulcrum-pin 43 suitably secured in the standard 2 and has its other arm. pivotally connected with the lower end of a itmanbar 44 Cprovided at its upper end wit a fork 45 stra dling a triangular cam 46. The cam 46 is carried by a gear-wheel 47 driven by a pinion 48 suitably fixed upon the main-shaft 8, the gear-wheel 47 being journaled upon the reduced end of a fulcrum-shaft 49 supported by the standard 2.

Directly below its fork, the itman-bar 44 carries a pivot-pin 50 secured y a screw 51 to project beyond opposite sides of said pitman-bar. Connected with said pivot-pin 50 is a bifurcated link 52 of which the lower end is apertured to receive a pivot-b0lt 53, secured upon the free end of a depending crank-arm 54 to thereby constitute the fulcrum of the pitman-bar 44. The crank-arm 54 is secured within the standard 2, upon a short shaft 55, disposed substantially parallel to the rock-shaft 37 and journaled for rocking movements in a suitable aperture provided in a bushing 56 eccentrically of the circular periphery of said bushing. The bushing 56 is rotatably adjustable in a suitably apertured boss 57 upon the standard 2, to thereby change the position of the axis of the crank-arm shaft 55, and said bushing may be fixed in any circularly adjusted position by means of a screw 58 threaded into the boss 57 to bear upon a contact-piece 59 in engagement with the circular periphery of the bushing.

The bushing 56 projects be 0nd the outer side of the boss 57 and secure thereupon, b set-screws 60. is the hub of a needle-zero-path controlling arm 62 having at its free end a boss 63 overhanging the machine-frame boss 57. The boss 63 is provided with a bushing 64 apertured to receive a shouldered plunger or latch-pin 66 having a knurled head 67, which is urged to engage the outer face of the boss 63 by a sprin 68 coiled about the latchpin 66. The maciineframe boss 57 is pro vided with a pair of keeper-sockets 69 and 70 positioned to alternately receive the latchpin 66 when the arm 62 is swung to circularly adjust the bushing 56, it being understood that the bushing securing screw 58 is normally backed off to free the bushing.

Directly adjacent the hub of the arm 62, the bushing 56 terminates in a preferably integral segment-plate 71 provided with a segmental slot- 72 in which

spaced stops

73 and 74 are adjustably secured. Thecrank-shaft 55 extends outwardly beyond the segmentplate 71, and secured by screws 75 upon the projecting end of said shaft is the hub of an arm 77 having its free end offset to overhang the curved periphery of the segmentplate. Threaded into the offset portion of the arm 7 is a securing screw 78 whereby the arm may be fixed upon said segment-plate when so desired.

Dependent upon the nature of the seam to be produced, the arm 77 may be limited in its movement about the axis of the crankshaft 55 by the segment-

plate stops

73 and 74, which stops may of course be suitably ad justed upon the segment-plate for the required purpose. Additional means is, however, provided in the present machine'for limiting the movements of the arm 7 7 and to this end the hub 76 of said arm has oppositely extending

lugs

79 and 80 in which stop-

screws

81 and 82 are adjustably secured to alternately engage the overhanging bracket-arm 3 at spaced points thereof. Furthermore. the segment-plate 71 carries a fixed stop-screw 83 projecting from the periphery of said plate in the path of the offset portion of the arm 77 to limit movement of said arm in one direction, and movement in the opposite direction may be limited by a stop-screw 84 adjustably threaded into an car 85 extending laterally from the arm 62. All of the referred to stop elements come into use under different sewing conditions, as will now be described.

Should it be desired to cause the needle to vibrate laterally a greater or less extent entirely to one side of a fixed point, the zeropath controlling arm 62 is first positioned as illustrated in Figs. 1 and 4, i. e., with the latch-pin 66 entering the upper boss-socket 69. In this position of the zero-path controlling-arm 62, the vibration-amplitude controlling-arm 77 of the needle automatically assumes the position indicated in full lines in Fig. 4, with the stop-screw 81 in engagement with the machine bracket-arm 3, by reason of the weight of treadle connections which are in the present'case employed for control ling the amplitude of needle vibration. These treadle connections include a rock-arm 86, fulcrumed beneath the cloth-plate 1 and pivotally connected to the lower end of a twisted link 87 connected at its upper end with a lateral extension 88 of the crank-arm 54 which is rigid with the arm 77. It is of course obvious that a suitable spring might be employed to yieldingly urge the arm 77 to swing upwardly to cause said arm to normally occupy the position illustrated in Fig. 4 of the drawings, in which position of said arm 77 the needle reciprocates in a fixed path constituting the zero-path of the needle at one side of its extreme range of lateral vibration.

By referring to Fig. 7 of the drawings, which diagrammatically illustrates in full lines the needle-vibrating connections in a position corresponding to the controllingarm positions shown in full lines in Fig. 4, it will be observed that upon rotation of the cam 46, the forked pitman-

bar

44, 45 will be vibrated about the point a of pivotal connection of said bar with the lever 42 without perceptibly rocking said lever. This is due to the fact that the fulcrum point 53 of the link 52 is in alinement with the axis of the cam-shaft 49 and the pivot point (1, whereby the pivotal connection 50 of the link 52 with the pitman-bar vibrates from b to 0 in a substantially horizontal direction, consequently imparting no appreciable endwise movement to the pitman-bar 44. The needle-bar 15 therefore reciprocates successively in a fixed path illustrated by the dot-dash line n.

By now swinging the vibration-controlling arm 77 downwardly, as for instance its maximum extent determined by the engagement of the arm 77 with the segment-plate stop 83, the crank-shaft 55 will be rocked to carry the link fulcrum 53 to the point 53, Fig. 7. Rotation of the cam 46 will now cause vibration of the link 52 about the fixed point 53, whereby the pivotal connection 50 between the link 52 and the pitman bar 44 will be vibrated between I) and c. This resolves rying the pivot a to a and consequently rock mg the lever 42 which transmits its movement through link 41, crank-arm 40 and rockshaft 37 to the needle-bar frame. The movetirely to one side of the neutral oint b, Fig. 7, because said pivot-pin 50 is in alinement with the axis of the crank-arm 54 in one of the extremes of lateral movement of said pivot-pin 50, as indicated at 1). Therefore the resultant vibration of the needle-bar is evidently entirely at one side of the zero or neutral path of non-vibration of the needlebar represented by the dot-dash line 12, the maximum throw position of the needle-bar being indicated by the dotted line n. Accordingly zigzag stitches s, Fig. 9, will be produced and the width of the zigzag stitches is of course dependent upon the extent that the controlling arm 77 is swung downwardly from its upper or neutral position. When desired, the arm 77 may be secured by the screw 78 to the segment-plate 71 in any selected position of said arm to effect the successive production of zigzag stitches of the desired constant width. The described treadle-connections with the crank-arm 54 pro vide convenient means for controlling the width of the zigzag stitches during the operation of the machine, when the screw 78 is released from the segment-plate 71. By relative adjustment of the segment-plate stops 73, 74, the extent of swinging movement of the controlling-arm 77 may be determined between the limits defined by the stop-screw 81 and segment-plate stop 83.

Referring now more'particularly to Figs. 5 and 8 of the drawings, when it is desired to effect the production of zigzag stitches in which the zero-path of non-vibration of the needle is disposed centrally of the width of the zigzag stitches, the zero-path controlling arm 62 is swung downwardly into a position wherein the latch-pin 63 enters the keepersocket 70. Thisdownward movement of the arm 62 turns the bushing 56 and thereby bodily displaces the crank-shaft 55 about the axis of the bushing 56 from the position indicated in Fig. 7 to that indicated in Fig. 8. This adjustment not only causes a downward movement of the pitman-

bar

44, 45 but also carries the axis of the crank 54 laterally out of alinement with the pivot-pin 50. However, before the arm 62 reaches its lowered position, the stop-screw 84 carried by said arm engages the 'vibratiomcontrolling arm 77 and swings the latter slightly downwardly, thereby correspondingly rocking the crank-shaft 55 and displacing the link-fulcrum 53. to an extent such that said link-fulcrum 53 is in alinement with the axis of the rock-shaft 49 and the pivotal connection a of the pitman-bar with the ment of the pivot-pin 50 of the link 52 is enabout the fulcrum-point 53 in a substantially horizontal path at opposite sides of the point 6, i. e., between and (1. Consequently, no appreciable endwise movement is imparted to the pitman-bar 44 and the needle-bar reciprocates in a fixed path represented by the dotdash line a, Fig. 8.

By now swinging the vibration-controlling arm 77 downwardly, as for instance its maximum extent determined by the engagement of the stop-screw 82 with the machine bracket-arm, (see the dotted line position of the arm 77, Fig. the crank-shaft will be rocked to carry the link fulcrum 53 to the point 53', Fig. 8. Rotation of the cam 46 will now cause vibration of the link 52 about the fixed point 53', whereby the pivotal connection 50 between the link 52 and the pitman-bar 44 will be vibrated in the are e, f, i. e., in a general direction inclined to a hori zontal line and cross the neutral point I). The resulting endwise movements of the pitmanbar 44 shifts its pivotal connection a with the lever 42 between a and (1 Fig. 8 and thereby effects vibratory movements of the needle-bar 15 across the neutral path n and between a and n The resulting zigzag-stitch seam is illustrated by s, Fig. 9, it being of course evident that the width of the zigzag stitches is dependent upon the extent of downward movement of the arm 77.

It will be observed that the zero or neutral path it of the needle-bar, as shown in Fig. 7 of the drawings, corresponds with the path n of Fig. 8, which latter path is at one side of the zero or neutral path n. In other words, the field of maximum lateral vibration of the needle is constant for any predetermined adjustment of the controlling mechanism, and it is only the zero or neutral path n of the needle which is changed with respect to said field.

As the needle-bar frame 18 swings about its pivotal support 19, it follows that if the path 71 of the needle-bar is vertical in one zero position, said zero path n is necessarily inclined to the vertical in its other position. To compensate for this change in the direction of the zero paths of the needle-bar, the fulcrum axis of the needle-frame 18 may beshifted by adjustment of the eccentric fulcrumstud 19, 20. In order to conveniently and accurately adjust the fulcrum-stud 1-9, 20, the faceplate 7 is provided with an aperture 89 to apply a screw-driver or similar implement to the slotted head of said fulcrumstud. The face-plate is additionally provided with an aperture 90 for inspection of indicia upon the adjacent face of the fulcrum-stud head.

Having thus set forth the nature -0f--the invention, what I claim herein is 1. In a zigzag-stitch sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, a needle-zero-path controlling member shiftable from one predetermined position to another for changing the zero path of non-vibration of the needle-bar, a needle-vibration controlling member shiftable between positions determining zero and maximum vibration of the needle-bar, adjustable means defining the zero and maximumvibration positions of the needle-vibration controlling member, and an adjustably disposed sto -element comprising means for limiting t e movement of the needle-vibration controlling member at a point intermediate the maximum throw positions of said needle-vibration controlling member.

2. In a sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, means for reciprocating said needle-bar, a pitman-bar, means for laterally vibrating said pitman-bar, a link connected with said pitman-bar, a crank-arm pivotally connected with said link thereby providing a pitmanbar fulcrum shiftable 1n a direction crosswise of said pitman-bar into positions favorable for resolution of lateral movements of the pitman-bar into endwise reciprocations thereof, operative connections for transmitting the endwise movements of said pitmanbar to the needle-bar to impart the lateral vibratory movements thereto, a rotatively adjustable bushing, a pivotal support for said crank-arm upon said bushing eccentrically of the axis of rotation of the bushing, and means for rotatively adjusting said bushing from one predetermined point to another to thereby change the zero path of non-vibration of the needle.

3. In a sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, means for reciprocating said needle-bar, a pitman-bar, means for laterally vibrating said pitman-bar, a link connected with said pitman-bar, a crank-arm pivotally connected with said link thereby providing a pitmanbar fulcrum shiftable in a direction crosswise of said itman-bar into positions favorable for reso ution of lateral vibratory movements of the pitman-bar into endwise reciprocations thereof, operative connections for transmitting the endwise movements of said pitman-bar to the needle-bar to impart the lateral vibratory movements thereto, a rotatively adjustable bushing, a pivotal support for said-crank-arm upon said bushing eccentrically of the axis of rotation of the bushing, a needle-zero-path controlling member carried by said bushing, means for releasably latching said controlling member in positions determining spaced zero-paths of non-vibration of the needle-bar, and means for shift ing said crank-arm about its pivotal support with said link thereby providing a pitmanbar fulcrum shiftable in a direction crosswise of said itman-bar into positions favorable for reso ution of lateral vibratory movements of the pitman-bar into endwise reciprocations thereof, 0 erative connections for transmitting the en wise movements of said pitman-bar to the needle-bar to impart the lateral vibrator movements thereto, a rotatively adjusta le bushing, a pivotal support for said crank-arm upon said bushing eccentrically of the axis of rotation of the bushing, a needle-zero-path controlling member carried by said bushin means for releas ably latching said control ing member in posi ions determining spaced zero-paths of nonvibration of the needle-bar, a needle-vibration controlling member, and means effective upon shifting of the needle-zero-path controlling member for shifting said needle-v1- bration controlling member into neutral posit-ion.

5. In a sewing machine, an endwise recip roca-tory and laterally vibratory needle-bar, means for reciprocating said needle-bar, a pitman-bar, means for laterally vibrating said pitman-bar, a link connected with sai pitman-bar, a crank-arm pivotally connected with said link thereby providing a pitmanbar fulcrum shiftable in a direction crosswise of said pitman-bar into positions favorable for resolution of lateral vibratory movements of the pitman-bar into endwise reciprocations thereof, operative connections for transmitting the endwise movements of said pitman-bar to the needle-bar to impart the lateral vibratory movements thereto, a rotatively adjustablebushing, a pivotal sup port for said crank-arm upon said'bushing eccentrically of the axis of rotation of the bushing, a needle-ze'ro-path controlling member carried by said bushing, means forreleasably latching said controlling member in positions determining spaced zero-paths of non-vibration of the needle-bar, a needle-vibration con trolling member, adjustable means defining a neutral position of the needle-vibration controlling member, and means yieldingly urging said needle-vibration controlling member into its neutral position.

6. In a sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, means for reciprocating said needle-bar, a pitman-bar, means for laterally vibrating said pitman-bar, a link connected with said pitman-bar, a crank-arm pivotally connected with said link thereby providing a pitmanbar fulcrum shiftable in a direction cross wise of said pitman-bar into positions favorable for reso ution of lateral vibratory movements of the pitman-bar into endwise reciprocations thereof, 0 erative connections for transmitting the en wise movements of said pitman-bar to the needle-bar to impart the lateral vibratory movements thereto, a rotatively adjustable bushing, a pivotal support for said crank-arm upon said bushing eccentrically of the axis of rotation of the bushing, a needle-zero-path controlling member carried by said bushing, means for releasably latchin said controlling member in positions determining spaced zero-paths of non-vibration of the needle-bane needle-vibration controlling member, and adjustable means limiting the extent of shiftin movement of the needle-vibration controlhng member out of its neutral position.

7. In a sewing machine, an endwise reciprocatory and laterally vibratory needle-bar,

means' for reciprocating said needle-bar, a pitman-bar, means for laterally vibratin said pitman-bar, a link connected with sai pitman-bar, a crank-arm pivotally connected with said link thereb providing a pitmanbar fulcrum shiftable in a direction crosswise of said pitman-bar into ositions favorable for resolution of lateral vi ratory" movements of the pitman-bar into endwise reciprocations thereof, operatlve connections for transmitting the endwise movements of said pitmanbar to the needle-bar'to impart the lateral vibratory movements thereto, a rotatively adjustable bushing, a ivotal support for said crank-arm upon sai bushing eccentrically of the axis of rotation of the bushing, a needlezero-path controlling member carried by said bushing, means for releasably'latching said controlling member in positions determining spaced zero-paths of non-vibration of the needle-bar, a needle-vibration controlling member, and a plurality of selective stops adjustable independentl of each other for limiting the extent of shlfting movement of the needle-vibration controlling member out of its neutral position.

8. In a sewing machine, a reciprocatory needle-carryin bar, means for reciprocating said bar, a aterally movable needle-bar frame, a rock-shaft disposed substantially parallel with said actuating shaft, operative connections between the rock-shaft and said frame, a pitman-bar, means for laterally vibrating said pitman-bar, a link connected with said 'pitman-bar, a-crank-arm pivotally connected with said link thereby providing a pitman-bar fulcrum shiftable in a directlon crosswise of said pitman-bar into positions favorable for resolution of lateral movements of the pitman-bar into endwise reciprocations thereof, means acting to yieldingly urge said crank-arm into a neutral position of the pitman-bar fulcrum, operative connections with said pitman-bar for transmittingthe endwise movements thereof to said rock-shaft, a rotatively adjustable bushing, a rock-shaft journaled in said bushing eccentrically of the axis of rotation of the bushing, said rockshaft carrying said crank-arm, means for rotatively adjusting said bushing from one predetermined point to another to thereby change the zero path of non-vibration of the needle, and means for oscillating said rocks'haft to swing the crank-arm into another neutral osition of the pitman-bar fulcrum upon ad uStment of said bushing.

9. In a zigzag-stitch sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, a needle-zero-path controlling member shiftable into positions determining spaced zero ,paths of non-vibration of the needle-bar, a shiftable needlevibration controlling member having a neutral"position within the path of movement of said needlezero-path controlling member, and a stopelement determining said neutral position of the needle vibration controlling member.

10. In a zigzag-stitch sewing-machine, an endwise reciprocatory and laterally vibratory needle-bar, a needle-zero-path controlling member shiftable into positions determining spaced zero paths of non-vibration of the needle-bar, a shiftable needle-vibration controlling member having different neutral positions of non-vibration of the needle-bar corresponding to the zero positions of the needle-zero-path controlling member, said needle-vibration controlling member in one of its neutral positions being disposed in the path of movement of said needle-zero-path controlling member, and stop-elements determining said neutral positions of the needlevibration controlling member.

11. In a zigzag-stitch sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, a needle-zero-path controlling member shiftable into positions determining spaced zero paths of non-vibration of the needle-bar, a shiftable needle-vibration controlling member having a neutral position within the path of movement of said needle-i zero-path controlling member, and a sto element adjustably carried by one of sand members en ageable with the other member to shift said needle-vibration controlling member into a different neutral osition upon shifting of the needle-zero-pat controlling member.

12. In a zigzag-stitch sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, a needle-zero-path controlling member shiftable into positions determining spaced zero paths of non-vibration of the needle-bar, a shiftable needle-vibration controlling member normally occupying a neutral position of non-vibration of the needlebar in one of said zeropaths, adjustable means independent of the needle-zero-path controlling member for predetermining said neutral position of the needle-vibration controlling member, and means adjustably carried by one of said members engageable with the other member for predetermining another neutral position of the needle-vibration controlling member in the other position of the needle-zero-path controlling member.

13. In a zigzag-stitch sewing machine, an endwise reciprocatory and laterally vibratory needle-bar, a needle-zero-path controlling member shiftable from one predetermined position to another for changing the zero path of non-vibration of the needle-bar, a needle-vibration controlling member shiftable between positions determining zero and maximum vibration of the needle-bar, and difi'erent sto elements determining the opposite limits 0? movement of the needle-vibration controlling member in the different ositions of the needle-zero-path contro ling member.

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

WALTER MYERS.