SU662637A1 - Chain stitch sewing machine - Google Patents

Description

one

The invention relates to the manufacture of equipment for the garment industry and concerns a chain stitch sewing machine.

A chain stitch sewing machine is known, comprising kinematically associated mechanisms with a needle shaft, thread feeder, looper and a fabric engine having a gear rack lifting shaft and a slotted needle plate (I).

This machine has a multi-shaft system of shafts and gears to the actuators with the needle bar above the machine body, and switching from one stitch to another requires turning off the machine, which takes a long time.

In the proposed sewing machine, in order to simplify the design and expansion of technological capabilities, the looper is kinematically connected with the lifting shaft of the gear rack of the engine mechanism of the fabric, and the slot in the needle plate is made adjustable, in addition the looper has a crescent shape.

FIG. 1 shows a kinematic diagram of a sewing machine; in fig. 2 - crescent looper and its fastening; in fig. 3-6 - a series of consecutive positions of the looper in vrdm work; in fig. 7 shows section A-A in FIG. five; in fig. 8 - needle plate, top view; in fig. 9 the same, bottom view; in fig. 10 and I - type of seams; in fig. 12 - the interrelation of the looper and the rack….

The sewing machine comprises a needle mechanism connected to the main shaft 1, consisting of a crank 2, a crank mechanism 2, 3 and 4, a needle bar lever 5 and a needle 6, as well as a looper-shaped looper mechanism 7 and a fabric engine having a device for lifting the toothed rack 8, with the looper 7

mounted on the shaft 9 of the raising of the rack 8.

The raising of the rail 8 is effected from the eccentric 10 on the main shaft 1, the pngarny mechanism II and 12 to the shaft 9, on the left end of which there is a rocker arm 13

Claims (2)

(Fig. 12) with a movable holder 14, by means of which the lifting of the rack 8 is adjusted and secured with a screw 15. From the successively extended part 16 of the rocker arm 13, through link 17, movement is transmitted to the shaft 18 of the looper 7, with the shaft 18 being cantilevered in the bearing 19 using the locking screw 20 (Fig. 2). During one revolution of the main shaft 1, the rocker 13 makes one swing, gear rack 8 - one movement up and down, and looper 7 - turn to one and the other side. The longitudinal movement of the rack 8 comes from an eccentric 21 mounted on the main shaft 1, on which the rocker stone rotates, slides in the fork of the driver 22 and then the shaft-23, and the movement of the latter is transmitted to the rocker arm 24, to which the rack and arm 8 are hingedly attached. . When swinging the shaft 23 of the rack, the rack 8 moves forward and backward. The stroke of the rail depends on the degree of swing of the shaft 23. When the main shaft 1 rotates, the mechanism for raising and lowering the rack 8 and the needle bar mechanism are activated. When the shaft 9 is rocking, the looper 7 begins to move, turning a certain angle in one direction of the working stroke of the rack 8 and returning to the initial position in one turn of the shaft I. After the first puncture of the fabric (Fig. 3) at the moment the needle 6 comes out of the lowermost position of the needle loop 25 is captured by the nose 26 of the looper 7. At the time the needle bar system leaves the extreme upper position (Fig. 4), the looper 7 is in the leftmost position with the thread 25 loop on, while the fabric moves along arrow 27. Thus machine operation is carried out in the usual way, and then comes the formation of a chain stitch (Fig. 5). A second puncture of the tissue occurs with a needle 6 and a string 28 with an entrance to the first loop 25. Then, Il1a 6, continuing downward movement, and looper 7, moving, occupies the extreme right position. At this point (Fig. 6), the needle 25 with the help of the needle 6 is removed from the looper 7. The entire system returns to its original position. At subsequent revolutions of the shaft f, the cycle for the formation of a chain stitch (FIG. 10) is repeated. If it is necessary to transfer the sewing machine from a chain stitch operation (Fig. 10) to the lining of the snare (Fig. 11) in the needle plate 29, there is a fig 30 slot as the needle hole (Fig. 8 and 9). From the bottom of the needle hole 30, the screw 32 is fastened with a screw 31, which for adjusting the slot 30 has a lever 33 facing the window 34. To transfer the work to the silky lever 33, the lever 33 is moved to the extreme position from the needle 6, and the threaded thread is not removed from the needle and thread feeder, removed from the tension adjuster (not shown) of the machine. The movement of the fabric pulls off the relaxed thread of the looper from the looper 7 ahead of the needle 6. This happens when the looper 7 is idling in the opposite direction of movement of the fabric along arrow 27. At the same time, the needle 6 does not catch the type 25 loop on the next punctures, only a puncture trace remains on the fabric in the form of a loop-snares 35 (Fig. 11). FIG. 5 conventionally shown loop 25 in the formation of a chain stitch. If the machine is running along the line, instead of loop 25 there will be a loop 36 (Fig. 7). When converting the machine to work with a normal chain stitch, the lever 33 is moved so that it closes the figure notch 30, leaving only a circular hole for the passage of the needle. Claim 1. A chain stitch sewing machine comprising kinematically connected to the main shaft the mechanisms of a needle, thread feeder, looper and a fabric engine having a toothed rack and a needle plate with a slot, so as to simplify the design and expansion technological capabilities, the looper is kinematically connected with the shaft of raising of the gear rack of the mechanism of the fabric engine, and the slot in the needle plate is made adjustable. 2. The machine according to claim. It differs from the fact that the looper has a crescent shape. Sources of information taken into account during the examination 1. N. Malshikov and others. “Equipment of garment factories, 1% 8, p. 105, machine 222 cl., Produced by the Podolsk mechanical plant them. M. I. Kalinina. 18 27 20 silt i / / 51 r - M -gpp / l I X fUl.S 7, 31 31 29 Put.9 ..I2: G.Y2: I-.-T.-: 5 ---. FIG W L