US1339243A - Sewing-machine - Google Patents

Description

K. VESELY.

SEWING MACHINE.

APPLICATION FILED 1U.LY10,19I 9,

1,339,243. Patented May 4, 1920.

2 SHEETSSHEET I.

mfgVENTOR. k

K. VESELY.

SEWING MACHINE} APPLICATION men JULY 10, I919.

1,339,243. Patented -May4, 1920.

2 SHEETS-SHEET 2- ,1 J .2 l

INVENTOR KAREL VESELY, or TYNICE, NEAR sAzAvoU, czEoHos ovAKIA,

SEWING-MACHINE.

I Specificationof Letters Patent.

Patented May 4, 1920.

Application filed Ju1y.10, 1919. Serial No. 309,913.

To all whom it may concern Beit known that I, KAREL VEsELfla citizen of the Czechoslovak Republic, and residing at Tynice, near Sazavou, Czechoslovakia, have invented certain new and-useful Improvements in Sewing-Machines, of which the following is a specification.

The present invention has reference to certain new and useful improvementsin sewing machines. and relates more particularly to double lock stitch machines, and; its object is to simplify and improve the construction and operation of machines ofthis type, which is accomplished by arranging the shuttle unit above the work plate within a case securedto the presser foot bar and-- by positioning the needle bar with its actuating mechanism below the work plate and imparting to the needle bar a peculiar pendulum or rocking movement, whichipermits the needle to cast the needle loop-caught by the shuttle point in the manner requisite for forming the double lock stitch.

In order to make my invention more readily understood I will now describe it in connection with the accompanying, more or less diagrammatic drawings, in which Figure 1 is a side elevation and Fig. 2 a rear View, both partly in section.

The shuttle of the shape shown and denoted by the reference numeral 1 is housed within the cup-shaped case 2 secured to the cranked-out presser foot bar 3. The case as well as the shuttle are relatively stationarily arranged on the presser bar. The driving shaft 5 is journaled in the frame bearing 6 and 7 denotes the frame portion in which a pin 8 is adjustably secured and supported. To the driving shaft 5 is keyed a crank arm 11 whose pin 12 is pivotally secured to the rigid frame 12, 13, 14L. The pin 13 is linked to a connecting rod 15, the other end of which is pivotally secured to the machine frame, as at 10. The pin 12 moves through a complete circle, as indicated by a dotted line in Fig. 2, in the direction of the arrowo. To the pin 13 is imparted a reciprocation in the arc of a circle d, which causes the pin 14 to execute the closed double-loop curve 16 with one node, the direction of travel being indicated by arrow The pin 14: is fulcrumed on the needle bar 17, which latter is guided in sleeves 18 and 19. These guide sleeves form part of bracket arm 20 (Fig, 1) which isrockingly suspended by the shaft 21 journaled in the plane of theneedle plate of the mach-inc. The needle bar, thus,is forced to join in the rocking movement of the arm 20, so that the needle always traverses the needle plate and the work at one and the same. point, the stitch forming point, the needle point in each cycle moving through the treble-loop curve 23 (Fig. 2) having two nodal points, the lower one of which coincides with the. stitch forming. .point.

The operation of the described mechanisms is the following zeThe needle pierces;

the Work invertical' direction, ascends toward the, left as indicated by the arrow 0' to. the highest point of its travel, next recedes slightly which forms the needle loop, and'ithen moves over toward the right. The

loop is now caught-up by the point of the.

shuttle 1, is then looped around and. down the shuttle by. the needleain itsfurther descent, which completeslthe double lockstitch formation.

The needle thread 28 passes from the bobbin over a tension member 24, through the eye 25 on the needle bar, then through the eye 26 .on the rock arm 20, thence through eye 27 on the needle bar, and finally up the latter to the needle eye. Thus, the thread is tensioned or taken up only after the needle'has droppedbelow the stitch plate.

The work is fed forward in well known manner by means of the feeder plate or dog 22 secured to the feed bar 29, the one end of which is guided on a crosspin 30, and whose other end is pivotally connected by means of a pin 31 journaled in the fixed frame bearing 32 (Fig. 1) to the connecting rod 33. This latter rigidly extends from an eccentric 34 driven by the main driving shaft 5 and rocks about the fulcrum pin 8, which can be adjusted within that portion of the machine frame 7 and slot 7 in the connecting rod 33 and said pin can be locked in the desired fulcrum position; the extent of the stitches can therefore be readily altered thereby.

What I claim is 1. In a sewing machine, in combination with the machine frame including the Work plate, stitch forming mechanism, comprising a presser bar, a case near the lower extremity thereof, a shuttle in said case, said parts all arranged above said work plate, and a needle actuating mechanism arranged below said work plate, the needle reci rocating through said work plate in timec cooperation with said shuttle.

2. In a sewing machine, in combination with the machine frame including a work plate, shuttle means arranged above said Work plate, and needle actuating means below said work plate, comprising actuating mechanism for reciprocating the needle in cooperation with said shuttle means, and for, rocking it simultaneously in such man nor that its point moves through a compound curve having two nodal points, the one of which coincides with. the stitch forming point.

3. In a sewing machine, in combination with the machine frame including the main drive and a work plate, a presser bar, a shut tle unit thereon; a needle actuating mechanism located below said work plate and comprising a needle bar, a needle in the upper end thereof adapted to cooperate with said shuttle unit, a bracket member rockingly journaled at its upper end in the plane of said work plate, guide sleeves extending from said bracket member and designed to" slidably receive said needle bar, a triangular frame, one apex of which is fulcrumed on said needle bar intermediate 'sald guide sleeves, a crank arm'operated through said main drive and jointed to the second apex of said triangular frame, and a link respectively pivoted to the third apex of said triangular frame and the machine frame, the

. parts being so constructed and cooperating with the machine frame including a'work plate, a shuttle unit abovesaid work plate, a needle and needle bar below said work plate, actuating mechanism therefor imparting to the needle bar a rocking movement, which causes it to execute a closed doubleloop curve with one node, and take-up means for drawing-up the needle thread only after the needle has descended below said work plate, comprising three thread eyes, two of which are located on said needle bar and the third on said bracket member, the thread beingguided first through one of said needle bar eyes, then through the bracket member eye, and finally through the second needle bar eye. I

KAREL vEsELY.

Witnesses: I

J AN B. VOJAEELY, B. I. PEOK.

Images