US2003200A - Attachment for sewing machines - Google Patents

Description

May 28, l935.- J. D. KARLE 2,003,200

ATTACHMENT FOR SEWING MACHINES Filed Aug. 1, 1933 2 Sheets-Sheet 1 iiivkl/zill/i/m I sfohn D. flarie W4 m as: 43

Wmaw W May 28, 19.35. J D, KARLE 2,003,200

ATTACHMENT FOR SEWING MACHINES Filed Aug. 1, 1935 2 Sheets-Sheet 2 fihvweam John D. Karla Patented May 28, 1935 ATTACHMENT FOR SEWING MACHINES John D. Karle, Roselle Park, N. J., assignor t o The Singer 'Manufacturing Company, Elizabeth, N. J a corporation of New Jersey Application August 1, 1933, Serial No. 683,112'

12 Claims.

21 35 stitches.

I l In the drawingsz Figure 1 is a front elevation, showing a portion of a sewing machine with my improved attachment .fixed thereto.

Figure 2 is a view similar to Figure 1 showing the .position of the parts at the beginning of the left to right shifting movement of the presseroot. r Figure 3 is a rear elevation. I I Figure4 is a disassembled perspective view of the actuating mechanism. I

My improvedattachment is shown applied to awellknown Singer family type sewing machinevhavingthe usual spring-pressed presser- ;bar I, reciprocatory needle-bar 2, needle-clamp 13, and needle 5. v I v In its preferred embodiment the attachment icdtnprises a channel block 5 adapted to be securc'dfby the fastening screw 6 to the angular lower portion of the presser-bar Carried by the-block 5 is a-plate, designated generally as 1, having an. upstanding inclined arm 8 and a cross- .arm 9 formed with elongated apertures l0, and outwardlyflprojecting lips H which form a guiding' channel. Slidably held in the guiding channelby the screws I 2 is a bar |3 having a depending portion M to which is secured by means of the screw |5 a presser-foot l6 formed with an elongated needle-aperture 'IG'. Fulcrumed upon the upstanding arm 8 of the plate 1 by the studpm I! is a swinging member |8 having its lower "end |9 extending down between an eccentric stop .2Q,,,adjustably secured to the slide -bar l3 bythe screw: I, and the end of the knurled headed adjustable stop-screw 22 fitted into a threaded aperture in the lug 23 fixed upon the end of the slidebarL] The swinging memberlB has an opening 24; (Fig. 4) with inwardly extending projections 25 and 25'. adapted to embrace and engage a cam element 26 having a plurality of circumferentially spaced projections 21. Fixed to the cam-element 26 is a ratchet-Wheel 28, and the cam-element and-ratchet-wheel are rotatably mounted on the upstanding arm 8 of the plate 1 by means of a bearing-pin 29.

' 'Fivotall'y secured to the arm 8 by the pivot-pin 30is'alever 3| formed with a forwardly extendling arm32 and a rearwardly extending arm 33. The lever 3| isconstantly urged downwardly by a coiled spring 34 (Fig. 4), one of the ends of the spring acting against the arm 33 of the lever and the other end against the arm 8 of the plate.. A pawl 35 is pivotally secured to the lever 3| by the pivot-pin 36 and is spring-pressed in aclockwise direction by a spring 36' which reacts be- 5 tween the lever 3| and the pawl 35. V

. Secured to the back of the arm 8 ofthe plate 1 by the pivot-screw 31 is a finger-lever 38 formed with a cam surface 39 and a stop 40. As-viewed in Figure 3 when the finger-lever 38 is moved from the full line to the dotted line positionthe camsurface 39 engages the rearwardly extending arm 33 of the lever 3| and forces it upwardly. In 7 this position the forwardly extending arm 32 of the pawl carrying lever 3| is raised to a position above the range of the needle-bar clamp 3 so that the attachment'may berendered inactive at the will of the operator and withoutstopping the vsewing machine. I 7 j I Operation Assuming the needle-bar andneedle be in the position indicated in Figure 1, the needlebar moves upward in the usual manner, and during its upward movement the needle-clamp 3 I .ment 2% being fixed to the ratchet-wheel 28 is also moved one-eighth of a revolution. The rotation of. the cam-element Tilt-causes one of the circumferentially spaced 7 projections 21 to contact the inwardly extending projection 25 and forcethe swinging .member I 8 to swing clockwise 4o bout its pivot I]; this swinging movement causing the lower end IQ of the member N to :abut the adjustable eccentric stop 20 and shift-the slide-bar l3 and the presser-foot I3 to the left, laterally of thelineof feed. :The shifting of the presser-foot It occurs while the usual four-motion feed-dog 421s below the throat-plateQ43 and is completed just prior to the'point in the cycle when the feed-dog 42 contacts the work. After the feed-dog 42 has fed the work forward the needle descends, forming the stitch, andon the upstroke of the needle the needle-clamp3 again engages the arm 32 of the lever 3| and swings the arm upward which causes the pawl 35 to again advance the ratchet-wheel one step. This causes 56 one of the circumferentially spaced projections 2'! to contact the inwardly extending projection 25' and cam the swinging lever l8 counterclockwise about its pivot II; this swinging movement causing the lower end IQ of the swinging lever [B to act against the end 22' of the knurled headed screw 22 and shift the slide-bar I3 and presserfoot I6 to the right, the parts again assuming the positions, as indicated in Figure 1. From the foregoing it will be observed that in the rotation of the cam-element 26, its peripheral projections successively engage those of the swinging lever I8 to vibrate the same and thus reciprocate the slide-bar and presser-foot.

When it is desired to render the attachment inactive or ineffective to vibrate the presser-foot the finger-lever 38 is swung about its pivot. If the lever 3| is in the position shown in Figure 3 the upper portion of the cam surface 39 of the lever 38 moves under the rearwardly extending arm-33 andholds the lever 31 in this position, and when the lever 3| is down the cam-surface'39 engages the arm 33 and forces the lever upwardly. It will be observed that the finger-lever 38 is pivoted tothe arm 8 of the plate 1; thus remaining stationary when the machine and attachment are in operation. This construction permits the operator to shift the lever at will and during the operation'of the machine.

If the machine is being used to sew a straight seam it is obvious thatthe vibrating mechanism may be rendered operative to vibrate the presserfoot to produce a zigzag seam without stopping the machine and at the will of the operator. This is accomplished by simply shifting the lever 38 from the dotted-line to the full line position as shown in Figure 3. This feature makes it possible to render at anytime the vibrating mechanism for the work-reciprocating member or presser-foot either effective or ineifective to shift the presser-foot, thereby greatly enlarging the field of usefulness.

From the foregoingdes'cription considered in connection with the accompanying drawings, the construction, manner of operation and several advantages of my improved attachment will be clearly and fully understood. It is apparent that such a device has a wide variety of uses, and it will be understood that the form, construction and arrangement of the several elements employed may be varied. Therefore, the privilege is reserved of resorting to all such legitimate changes therein as may be fairly embodied within the spirit and scope of-the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:-

1. A sewing machine having, in combination, stitch-forming mechanism including a reciprocatory needle-bar, a needle carried thereby, a presser-bar, a frame fixed to said presser-bar, a

presser-foot, means actuated by said needle-bar for imparting a vibratory motion to said presserfoot in a right line relative to said frame, and means for rendering said last named means inactive to vibrate the presser-foot at the will of the operator and without'stopping the stitchforming mechanism.

2. In a sewing machine, stitch-forming mechanism including a reciprocatory needle-bar, a

needle :carried thereby, feeding mechanism for advancing the work past the needle, a presserfoot, mechanism including a pawl for vibrating said presser-foot, means actuated by the needlebar for operating said pawl, and means for moving said last'named means out of the path of movement of the needle-bar whereby said mechanism may be rendered inefiective.

3. In a sewing machine, a presser-bar, stitchforming mechanism including a reciprocatory needle-bar carrying a needle, work-feeding mechanism, a presser-foot, mechanism actuated by said needle-bar for vibrating said presser-foot, said mechanism including a lever adapted to be actuated by the needle-bar, a pawl carried by said lever, and means for moving said lever to a position out of range of the needle-bar.

4. A zigzag-stitching attachment for sewing machines having, in combination, a plate adapted to be secured to the presser-bar having an upstanding arm and a cross-arm formed with a channel, a slide-bar carrying a presser-foot fitted in said channel, a swinging member having its lower end in operative engagement with said slide-bar and fulcrumed on the upstanding arm of said plate, a cam for actuating said member, and means for actuating said cam, said last named means including a spring-biased lever pivoted to the upstanding arm of said plate, a pawl pivoted to said lever, and a ratchet-wheel fixed to said cam.

5. A zigzag-stitching attachment having in combination, a plate, a slide-bar mounted on said plate, a member pivoted to said plate and in operative engagement with said sliding-bar, a cam for actuating said member, a ratchet-wheel fixed to said cam, a lever also pivoted to said plate and formed with a needle-clamp engaging arm, a pawl pivoted to said lever in a position to actuate said cam, and means carried by said plate for moving and holding said lever in one extreme position of its range of operative movement.

6. A sewing machine having stitch-forming mechanism including a reciprocatory needle-bar, a pressure-bar, a frame fixed to said presser-bar, a work-vibrating member, mechanism actuated by the needle-bar and adapted to vibrate said member in a right line relative to said frame, and means for rendering said vibrating means operable at will during the operation of 'the stitchforming mechanism.

7. In combination with a sewing machine having a needle-bar and a presser-bar, a plate secured to said presser-bar, a slide-bar carrying a. presser-foot mounted on said plate, a swingable member pivoted to said plate and in operative engagement with said slide bar, a cam for actuating said member, a ratchet-wheel fixed to said cam, a spring-biased lever also pivoted to said plate, said lever being formed with an arm extending into the path of movement of said needle-bar, and a pawl carried by said lever for actuating said ratchet-wheel.

8. A zigzag-stitching attachment comprising a spring-biased operating lever adapted to be operated by. the reciprocatory needle-bar of a sewing machine, a work-engaging member, mechanism operated by said lever for vibrating said work-engaging member, and means for moving said lever out of range of the needle-bar,

whereby the vibrating mechanism may be rendered ineffective to vibrate the work-engaging member.

9. A zigzag-stitching attachment for sewing machines having a frame adapted to be secured to the presser-bar of .a sewing machine, a presserfoot, andmechanism for vibrating said presserfoot relative to saidframe, said mechanism including a ratchet-wheel, a cam actuated thereby and having .a. plurality of circumferentially spaced projectionsya swinging lever having an opening which receives said cam for actuation thereby, a lever pivoted to said frame and adapted to be actuated by the needle-bar of a sewing machine, and a pawl sustained by and movable with said lever for imparting a step-by-step movement to said ratchet-wheel.

10. A zigzag-stitching attachment for sewing machines having a frame adapted to be secured to the presser-bar of a sewing machine, a presserfoot, mechanism for vibrating said presser-foot relative to said frame, said mechanism including a ratchet-wheel, a cam actuated thereby and having a plurality of circumferentially spaced projections, a swinging lever having an opening which receives said cam for actuation thereby, a lever pivoted to said frame and adapted to be actuated by the needle-bar of a sewing machine, a pawl sustained by and movable with said lever for imparting a step-by-step movement to said ratchet-wheel, and means for rendering said vibrating means ineffective to shift the presser-foot.

11. A sewing machine having stitch-forming mechanism including a reciprocatory needle, a

presser-bar, and straightaway work-feeding mechanism'and a zigzag-stitching attachment comprising a frame, a presser-foot, mechanism including a pawl and ratchet actuated by the needle-bar for vibrating said presser-foot relative to said frame, and means located between said needle-bar and presser-foot for rendering said mechanism ineffective to vibrate the presserfoot at the will of the operator and without stopping the stitch-forming mechanism.

12. A sewing machine having stitch-forming mechanism including a reciprocatory needle, a

presser-bar, and straightaway work-feeding mechanism and a zigzag-stitching attachment comprising a frame, a. presser-foot, mechanism including a pawl and ratchet actuated by the needle-bar for vibrating said presser-foot relative to said frame, and means located between said needle-bar and presser-foot for rendering said mechanism effective to vibrate the presserfoot at the will of the operator and without stopping the stitch-forming mechanism.

JOHN D. KARLE.

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