RU47374U1 - MECHANISM OF THE NEEDLE OF THE SEWING MACHINE - Google Patents

Abstract

The utility model relates to the clothing industry and can be used in sewing machines for sewing dense textile materials such as leather, drap, tarpaulin, etc. The device allows to reduce the inertial load of the needle bar mechanism and the friction of the needle on stitched materials. For this, the right and left spiral grooves are made on the needle bar shaft, thrust bearings are installed on the top and bottom of the connecting link, and the needle also has a spiral groove, while the grooves on the needle bar shaft and the needle are made one revolution around its axis.

Description

The utility model relates to the clothing industry and can be used in sewing machines for sewing dense textile materials such as leather, drap, tarpaulin, etc.

A device for driving a needle bar of a sewing machine is known, comprising a tubular guide with a recess for limiting the amount of movement of the connecting rod, a latch mounted on the piston head of the connecting rod with the possibility of contact of the spring-loaded rod with the recess of the needle bar. On the needle bar, restrictive flanges are made [1].

The design drawback of the needle bar drive is the presence of large inertial loads at the time of puncture of dense textile materials.

The prototype is a needle bar mechanism of a 22-A class sewing machine containing a needle bar connected through a connecting link with a connecting rod located on a double pin in contact with the crank and a needle mounted on the end of the needle bar [2].

The disadvantage of this design is the presence of large inertial loads at the time of puncture of dense textile materials.

The technical result of the claimed utility model is to reduce the inertial loads on the needle bar mechanism and reduce the friction of the needle on stitched materials.

The specified technical result is achieved by the fact that in the needle bar mechanism of the sewing machine containing the needle bar connected through a connecting link with a connecting rod located on the double finger in contact with the crank, the needle installed on the end of the needle bar, according to the utility model, the right and left are made on the needle bar spiral grooves, thrust bearings are installed on the top and bottom of the connecting link, and the needle also has a spiral groove for threading, with grooves on the needle bar shaft and gle made one revolution around its axis.

The technical result is achieved due to the smooth reciprocating and rotational movement of the needle of the sewing machine during the piercing of dense textile materials.

Figure 1 shows a General view of the inventive device, and figure 2 diagram of the movement of the needle.

The mechanism of the needle bar of the sewing machine contains a sewing needle 1 of figure 1, with a cut spiral groove 2 and an eye 3, fixed to the shaft of the needle bar 4 using a clamp 5. On the shaft of the needle bar, relying on the protruding flanges 6, using two thrust

bearings 7, the connecting link is attached 8. The mechanism contains two spring-loaded protrusions 9, the right 10 and left 11 spiral grooves are made in bulk of the needle bar. The grooves 10 and 11 on the shaft of the needle bar 4, as well as the groove 2 on the needle are made one revolution around its axis.

The needle bar mechanism of the sewing machine operates as follows.

The needle 1, moving from position A to position B, (figure 2) moves forward. Having reached stitched materials (position B), the spring-loaded protrusion 9 enters the spiral groove of the groove 10 of the needle bar shaft 4 (Fig. 1). As a result, the shaft of the needle bar 4 receives a rotational movement, which is ensured by the thrust bearings 7, on which the connecting link is supported 8. In the area BC, the needle 1 together with the shaft of the needle bar 4 experiences a complex motion: translational along the trajectory and rotational around its axis through an angle of 360 ° . Section SD and DS (reverse) needle 1 passes forward (the condition necessary for the formation of a loop - inlet). The spring-loaded protrusion 9 emerges from the spiral groove of the groove 10 of the needle bar shaft 4. When rising from position C to position B, the needle 1 again experiences a complex movement: translational along the trajectory and rotational about its axis. On the plot VA, the needle 1 moves progressively.

The thread, passing along the groove 2, takes the form of a spatial curve, as a result of which coils of false twist are formed, which compensate for unwinding caused by the influence of the sharp edges of the groove 2 and the eye of the needle 3.

Sources of information taken into account

1. USSR Copyright Certificate No. 781235. Sewing machine needle bar drive device. Publ. 11.23.80., Cl. D 05 B 55/08.

2. Garbaruk V.P. Calculation and design of the main mechanisms of shuttle sewing machines. - "Mechanical Engineering", 1977.232 s.

Claims (1)

The mechanism of the needle bar of the sewing machine, comprising a needle bar connected through a connecting link with a connecting rod located on the double finger in contact with the crank and a needle mounted on the end of the needle bar, characterized in that the right and left spiral grooves are made on the needle bar shaft, above and below the connecting link thrust bearings are installed, and the needle also has a spiral groove, while the grooves on the needle bar shaft and on the needle are made one revolution around its axis.