US514792A - tomsa - Google Patents

Description

(No Model.)

SHUTTLE AND NEEDLE OPERATING MECHANISM.

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No. 514,792. Patented Feb. 13, 1894.

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SHUTTLE AND NEEDLE OPERATING MECHANISM.

Patented Feb. 13, 1894.

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UNITED STATES ATENT FFICE.

vnoLAv- TOMSA, 0F PRAGUE, AUSTRIA-HUNGARY.

SHUTTLE AND NEEDLE OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 514,792, dated February 13, 1894.

Original'application filed June 20, 1892, Serial No. 437,302- Divided and this application filed April 5, 1893. Serial No. 469,202.

(No model.) Patented in England May 23, 1892, No. 9,785.

T0 at whom it may concern.-

Be it known that I, VAGL'AV TOMSA, of Prague, Kingdom of Bohemia, Austria-Hungary, have invented a new and useful Improvement in Shuttle and Needle Operating Mechanism for Sewing-Machines, (for which I have obtained British Patent No. 9,735 of May 23, 1892,) of which the following is a full, clear, and exact description.

My present application, which is a division of my application Serial No. 437,302, filed June 20, 1892, relates to improved mechanism for operating a double-pointed oscillating shuttle which is capable of making two stitches at each complete oscillation, and for operating the reciprocating needle in proper relation thereto.

The object of my improvements is to 0btainrapidity and efiiciency in operation, and simplicity in construction.

I will first describe my improvements with reference to the accompanying drawings, and

afterward more particularly point out the novelty in the annexed. claims.

In the said drawings:-Figure l is a longitudinal sectional view through the middle of my improved sewing machine. Figs. 2 to 6 inclusive, show several (lifierentforms of shuttles for myimproved machine. Fig. 7 is a detail view of the operating mechanism on the under side of the sewing machine table, shown ona smaller scale. Figs. 8 and 9 are detail views of the levers which transmit the movements from the drive shaft to the operative parts of the machine. Fig. 10 is an elevation of the operating levers showing them in their assembled position. detail sectional view of the needle-bar casing on a slightly larger scale. Fig. 12 is an end view thereof with the casing partly broken away.

In order to carry out my invention I use the same form of driving mechanism, described in my original application filed. June 20, 1892, Serial No. 437,302, in which application I have claimed the mechanism broadly as a mechanical movement. In place of the customary single driving shaft, I employ two shafts a and c, which move independently and are preferably supported in line with each other.

Fig. 11 is a and passes through a fixed bearing 9 near its other end and carries a face wheel or disk It which actuates the needle-bar k. The shaft (1 carries a cam disk D keyed upon it, which is embraced by the fork of a lever H, fulcrumed at P, Figs. 1 and 9, and carrying at its lower end a pin V'which engages with a slot in the lower end of atoothed sector lever Z (Fig. 10) which is fulcrumed at U. The latter lever gears with the above-mentioned pinion'e and when the shaft a is turned by means of the hand wheel, the cam D will oscillate the lever H, the oscillationof which will be transferred to the toothed sector, which in its turn revolves the pinion 6 forward and backward and thus imparts to the shaft can oscillatory motion. The disk h, following this motion, thereby raises and lowers the needlebar It as the pin 1 thereon projects into the undulating cam groove or slot m in the guidepiece Z. The guide-piece Zis centrally fastened to the needle-bar 7c and as the slot m in it is curved to the left as well as to the right (Fig. 12) the swinging of' pin 6 to the left and to the right, by the oscillation of the shaft 0, will produce an up-and-down movement of the needle-bar k, '5. e. during the swinging to the left one rise and fall, and during the swinging to the right another rise and fall of the needle-bar. The needle makes therefore two stitches and the feeder of course is correspondingly moved twice at each revolution of the hand wheel. The motion of the shuttle is also derived from that of the forked lever H (see Fig. 7), as the lower extremity of lever H engages in the forked end of the pivoted horizontal sector lever B, which gears with the pinion S keyed to the projecting stud of the shuttle carrier W which oscillates in the 5 IOO spectively with the tappets E, and F, for the purpose of transferring the motion of the fixed eccentric D to the loose eccentric O, and allow at each reversal of the shaft a, a short rest to the forked lever G. The lever G embraces and is operated by the loose eccentric O, and through suitable connections with the oscillating shaft 0 under the sewing table (see Fig. 7) actuates the feed plate B, and through it the presser bar B, as more clearly pointed out in my co-pending divisional application, Serial No. 482,768, filed August 8, 1893. By transferring the motion from the fixed eccentric D, (which operates the shuttle and needle) to the loose eccentric C (which operates the feeding mechanism) through the tappets E and F, the machine may be run in either direction without altering the nature of the work done, as the feeder does not act immediately on the reversal of the machine but waits for the needle and shuttle to make a complete stitch before operating. By this arrangement, the shuttle W, needle-bar 7c, and needle 10 are all operated in proper relation to each other.

According to the kind and thickness of the material, the shuttles are altered in shape, but theyare always constructed with points at both extremities, so that at each forward and backward movement they pass through a needle thread-loop and make a stitch. The bobbins are of ordinary construction. The needle is threaded in the usual way and the tools used with other machines can, with equal facility, also be used with this one.

In Figs. 2 to 6, the different forms of shuttles are shown, and will be understood without further explanation. The ordinary fiat bobbins a; are used in the forms of shuttles shown in Figs. 3, 4 and 5, while the long cylindrical bobbin 2 is used in the form of the shuttle shown in Fig. 6.

The operation of the machine will be clear from the above description.

Having thus described my invention, the following is What I claim as new therein and desire to secure by Letters Patent:

1. In a sewing machine, the combination of a rotary shaft, an oscillatory shaft, the needlebar and needle carried thereby and adapted to be reciprocated by said oscillatory shaft, an oscillatory shuttle, and suitable lever mechanism for oscillating said shuttle and for trans ferring motion from the rotary shaft to the oscillatory shaft, substantially as set forth.

2. In a sewing machine, the combination of a rotatable shaft, means for rotating said shaft, an oscillatory shaft supported in suitable bearings in line with the rotary shaft, a needle-bar adapted to be reciprocated by said oscillatory shaft, suitable lever mechanism for transferring motion from the rotary shaft to the oscillatory shaft, an oscillatory shuttle, and suitable means for operating the shuttle in proper conjunction with the needle-bar, substantially as set forth.

3. In a sewing machine, the combination of a rotatable shaft, means for rotating said shaft, an oscillatory shaft, the needle-bar reciprocated by said oscillatory shaft, a fixed cam mounted upon said rotatable shaft, a suitable pivoted lever engaging said cam and geared to and adapted to operate said oscillatory shaft, and an oscillatory shuttle also geared to said lever and adapted to be operated thereby, substantially as and for the purpose set forth.

4. In a sewing machine, the combination of a rotatable shaft a, means for rotating said shaft, an oscillatory shaft 0, a sleeve 1) secured to said shaft 0 and forming a journal for one end of the shaft a, suitable gearing between said shafts for transferring the 0scillatory motion to the shaft 0 from the rotary shaft a, a needle-bar adapted to be reciprocated by said oscillatory shaft, and an oscillating shuttle geared to the rotatable shaft and adapted to be operated in proper conjunction with the needle-bar, substantially as set forth.

5. In a sewing machine, the combination of the rotatable shaft a, supported in suitable bearings, means for rotating said shaft, the oscillatory shaft 0, the needle-bar adapted to be operated by said oscillatory shaft, the fixed eccentric F mounted on the shaft (1, the pivoted forked lever H engaging said eccentric, the pinion e keyed to the shaft 6, the pivoted sector lever Z engaging the pinion e, means of engagement between the lever 11 and lever Z, and a suitable oscillatory shuttle also geared to said lever II, substantially as and for the purpose set forth.

6. In a sewing machine, the combination of the rotatable shaft, means for rotating said shaft in either direction, fixed and loose eccentrics mounted upon said rotatable shaft and formed with tappets which are adapted to engage each other for transferring motion from the fixed to the loose eccentric, a reciprocating needle-bar, an oscillatory shuttle, a pivoted lever engaging the fixed eccentric and geared to and adapted to operate the needlebar and shuttle in proper conjunction, a feed plate, and a pivoted lever engaging said loose eccentric and geared to and adapted to operate the feed plate, whereby the shaft may be run for nearly a complete revolution when reversing, before the feed plate will be operated, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

VAOLAV TOMSA.

Witnesses:

TH. WALDAPFY, L. OFTHAIJOHN.

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