US1573139A - Sewing machine - Google Patents

Description

Feb. 16 1926. 1,573,139

W. BRASE SEWING MACHINE Origix xal Filed Oct. 12. 1923 WWW Patented Feb. 16, 1926.

"UNITED m *r E-s WILH'ELM rnasn, or BERLIN, GERMANY.

SEWING MACHINE.

Original application filed October 12, 1923, Serial No.-G68,250. Divi ded'and this application filed April 7 To all whom, may concern:

Be it known that I, lVILrrnLi-I BRASE, a citizen of theGerman Republiqresidi i-g at Berlin, Prussia, Germany, have invented certain new and useful Improvements in Sewing ll lachines, of which the following IS a specification.

This application'is a division from the application Serial No. 668,250, filedQctober 12, 1923. a

This invention relates to a jacquard device for automatically"controlling the adjustment of the fabric feed or IIGGCllGCtl'l'l'lGl frame, according to predetermined patterns r in embroidery sewing-machines.

\Vith suchmachines, in order to reduce'as much as possible-the i'nertiaof the partsto be "displaced in the short period of time available and necessitating quick jerky adjustments, I provide, in accordance with this invention, a track or guide, which in itself is well-known in the sewing- 1nachine art, and which I arrz-inge 1n the 1acquard control mechanism, so thatit' will actuate cam operated lever, Whosej'l'ongitudinal displacement is transmitted to the needleguide frame or fabric feed, While the adjustment characters denote corresponding partsand.

in which the same is shown in connection with the needle guide frame, the application A of my invention to a fabrlc feed being substantially the same.

Fig. 1 is a somewhat diagrannnat-ic view of my device illustrating its cooperation with parts of an embroidery sewing machine and Fig. 2 is a section through the" bearing of the track or guide. 4

n denotes the embroidery needle of a se'wing-machine slidably guided in a rigid frame or, which at its rear is formed with a rack b. The. latter rests on a stationary sharp edge or tooth (Z, and is held in position thereon by a roller provided onthe end of a pin or finger c actuated a pressure "spring 0 Capable of alternately engaging and disengaging the rack b, is a dog 'or-"tooth r projecting from the freeend of one arm of we e, mile-e he Faun Qt Serial No. 24,767.

which is bifurcated, as at 22, engaging arm .9 has pivoted to it at 00 one end of a rod h. l The otherendof said rod is-bifurcated, as at 2, and engages around a constantly revolving cam' il, whereby the rod is rocked on its pivot a? in a vertical directlon 1n-a plane at a right; angle to that of the lever This rod carries a roller Z,

that engages a circularly curved groove or track a formed in a block 2', which is pivoted centrally in the stationary frame of the mac'h1ne,as at 4-, (Fig. 2'). From one end of said block, projects an arm 5, the free end of which is actuated by'two oppositely actmg springs fastened to the frame of the machine and which have the tendency normally to maintain the block 2" in a central or normal position "in which the roller Z will be moved in the groove 2', describing a circu 'lar path around the pivot .7: of the leverh, and consequently not displacing the latter. longitudinally, sothat in this casethe angular lever t, '9 remains at rest and no motion is transmitted to the rack Z) or frame a by the dog or tooth r. Pivotally connected at "6 and .7 t0 the ends of the block 1', are fingers m, m, which are vertically guided n stationary partsof the machine frame, as at mfl'and the upper ends of which are bent toward one another, leaving between them only a narrow slit m Suitably mounted in the machine frame, as at 8 abovethe bent-ends of the fingers -m,"1n ",'is a shaft 8 carrying an eccentric or ca-m u adapted to actuate a plunger 0, so as to reciprocateth'eIlatter vertically. Pivoted' to the lower end of the plunger, is a rod 0 suitably guided, as at p, and carrying on its free end a roller 9. A spring "10 connected tothe plunger o has the tentlency, to draw "the plunger laterally and f-m'a'i ntain it in contactwith a pattern chain ,g, which is suitably moun ed pajama fed d ea mz embers or S g" as to that the latter maintains its central or nontral position at which there is no motion transmitted to the needle guide fran ie. lVhen the plunger, by virtue of a correspondingly sized pattern link, is swung to one or the other side of its central position,

either to the left or right, indicatedby dotted lines, it will, when moved downwardly under the action of the eccentric a, be thrust against the corresponding finger m or m, as a result of which the track block a" will be tilted against the action of the springs around the pivot 4 into aslanting position relative to the normah'in' which the circularpath or track 2' of the roller Z carried by the rod will be eccentric relative to the pivot 00. In such position of the rack, the lever it will be caused, during its lateral swinging movements, while following the track a, to also and positively move loi'igitudinally. This longitudinal movement will betransmitted to the angu- .lar lever g, t, thereby causing the dog 1" on disengaging the rack b from the {stationary tooth (Z to move it either to the 'ight or left, according to the direction into which the track block It" has been, tilted;

The arrangement described has the advantage that whenemploying a corresponding pattern, the extent of movement imparted by the dog 1* to therack b or frame a can be adjusted, so that the length and direction of the stitches can be changed in various ways. This can be accomplished by providing an adjustable eccentric or cam or a plurality of eccentrics of different eecentricity or cams of different sizes and by causing their corresponding plungers to be. selectively controlled by the pattern chain q in the, above described manner to act on corresponding fingers m, m.

Another way of accomplishing this would be by providing the plunger with steps or ,making-it of staggered thicknesses, so that theindividualsteps thereof will act on the corresponding fingers m, m, depressing the same to different depths. 1 In such case, of course, the pattern chain members will have to be of greater variation than in the first case, in order to effect graduated displacements of the plunger to the right or left to bring its difierentfstepsinto range with the; fingers 422 m. It is also possible to have the pivot w bear in a longitudinal slot a the le e A n a la-tei a sa w iii:

able movement to the tooth 1" through the constantly uniform movement of the rod 71-.

ing do'g capable of alternately engaging and disengaging said rack, and means for dis placing said frame, including a constantly swinging lever operatively connected to said dog and an adjustable track in which said formed with a circularly curved track or guide groove, a constantly swinging lever positively guided in said groove and a jacquard controlled reciprocating inember capable of tilting the track into different positions, so as to vary the movements of said lever and dog and consequently the stitches.

3 In a sewing machine, a needle guide carrying frame, a stationary means for dis placeably supporting said frame, and means.

for displacing said frame to vary the stitches, said means including a constantly swinging member. a curved guide in which said member is displaceably guided, and a jacquard controlled plunger 7 capable of operat-ively engaging either side ofv said guide and tilt the latter so as to displace saidmember therein and consequently vary the displacement of said f 'ame.

.4. In a sewing machine, a needle guide displace said member therein and consequently vary the displacement of said frame I a sewing a ine a tie-id e grade carrying frame, a stationary means for disjacquard controlled cam operated plunger placeably supporting said frame, and means capable of operatively engaging either side for displacing said frame to vary the of said guide and tilt the latter so as to 10 stitches, said means including a constantly adjust said lever mechanism and thereby swinging lever mechanism, a spring actuvary the displacement of said frame.

ated curved guide in which said lever In testimony whereofI aflix my signature. mechanism is adjust-ably guided and a VVILHELM BRASE.

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