DE53701C - Overlock sewing machine with rotating needle - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 52: Sewing machines.

(York County, England).

Patented in the German Empire on August 27, 1889.

The present invention relates to a rotary needle sewing machine for manufacture an extravagant seam, in which the thread cylinder is given a length shift necessary to produce the seam will.

In the machines that have been used up to now, this movement is brought about by tooth gears, which are moved by the drive shaft; however, these machines work with great wear and tear and great noise, furthermore, they have the disadvantage that the worker in setting the thread cylinder Both hands are used in the initial position.

All these disadvantages are to be completely avoided and eliminated by the present innovation the performance of the machine can still be increased.

In the accompanying drawings is the sewing machine with the innovation in question shown, namely:

Fig. Ι a side view,

Figure 2 is an end view of the machine.

Fig. 3 shows the machine partly in outline, partly in section.

4 to 8 show the individual positions of the needle and the position of the thread while making the seam.

α is the machine plate, a ¹ the table on which the work ^{piece lies while sewing, α 2} the presser foot under which the work piece slides while sewing. The foot step a ³ is used to lift the presser foot , while the spring a ¹ presses it onto the work piece during sewing. The machine plate rests on the uprights a ^s , in which the drive shaft b ^s arranged under the machine at the same time with the. Pulley c ^{4 is} mounted. The shaft b ^{s is driven} by the fixed and loose pulley £> ⁴ and £ ⁵ . Above the machine plate there is a shaft η on which the individual machine parts are arranged, b is the stationary headstock with the needle track c, in which the frame d rotates. In the frame d , shafts ee with arms gg are mounted, which are influenced by the grooved disk h attached to the headstock. The shafts ee are also provided with arms ff which, during rotation , engage in the incisions a ^{h of} the needle α ⁴ and take the latter with them.

On the shaft η a sleeve j is attached, which in turn carries the pulley i , through which the movement from the shaft b ³ is transmitted to the frame d. A second sleeve is also arranged on the shaft η and carries a pulley k; This sleeve is firmly connected to the shaft η by a suitable device, so that when the pulley k rotates, the shaft η and the thread cylinder s connected to it rotate.

The worm wheel 0, which is arranged on the shaft η and engages in a gear ρ and rotates this continuously, is used to move the material further. This wheel ρ sits on a shaft q which is supported at right angles to the machine and which has wheel r at one end

carries over which the chain r ^{1 used} to move the fabric goes.

The device by which the thread cylinder is imparted the length shift required for sewing consists of a screw g \ which is connected to a line roller h ^l ; the latter is placed loosely on a bolt or pin i ¹ and is set in rotation by the cord roller j ^{1 of} the drive shaft b ^3. k ¹ is the part of a nut or a plate which engages in the thread of the screw g ¹ , is fastened to a holder u ^l and is held on the shaft η of the thread cylinder between the projection f ^l and the "ring f" ¹ .

The part k ¹ and its holder m ¹ are moved by the screw g ¹ in the direction of the arrow g · ² , FIGS. 1 and 3, and if desired communicates this movement to the thread cylinder; t is a rod that is moved in accordance with the thread cylinder s . It carries part of the tensioning mechanism λ ¹ , ο ¹ is a spring which fixes part k ¹ into the thread of screw g ¹ and allows it to be pulled out of the screw if this is necessary to move the thread cylinder forward . This setting of the thread cylinder in the initial or forward position is done by means of the handle b ¹ , which can easily be done with one hand, so that a worker can achieve more on a machine provided with the present invention than on one without this mechanism.

The mode of operation of the machine is as follows: When sewing begins, the thread cylinder is in the position shown in FIGS. 1 and 3; If the machine is now started, the needle with the thread cylinder rotates in the direction of the arrow indicated in FIG. 4 and the fabric is pierced once with each rotation of the needle and one turn is wound onto the thread cylinder. This is continued until the entire thread cylinder is covered with helical turns. During this time the fabric to be sewn is moved forward evenly and exactly as many stitches are formed as there are turns on the thread cylinder; however, they are still limp. With further rotation one lets the screw g ^{x act} on the plate k ¹ ; hereby the thread cylinder is withdrawn, that is, moved in the direction of the arrow x 1, and the front part of the thread c ³ , FIG. 7, is forced by the opposite movement of the sewing tool to slide off the cylinder onto the jagged leather s ¹ and also about this and between the leather and the fixed part χ pass. During the rotation of the cylinder, the thread c ^{3 is} subjected to a pull due to the friction between the leather s ¹ and the fixed part χ , and so a turn or a stitch is drawn with each turn. Any slack in the thread after it has been tightened is caught by the rotating cylinder and the leather and slides off again during the subsequent rotation of the cylinder and is tightened.

Claims (1)

Patent claim: An overlock sewing machine with a rotating needle, in which the rotating thread cylinder (s), which takes up the thread loops formed by the needle, is displaced in the direction required for the thread loops to slide off by the fact that the axis of rotation of the thread cylinder is controlled by a screw spindle (g ^l ) from mediating a. triggerable; Driver (k ^l ) experiences an axial displacement. In addition 3 sheets of drawings.