RU2257433C1 - Sewing machine stretcher mechanism - Google Patents

Abstract

FIELD: sewing engineering, in particular, equipment for sewing machine with disk-type transporting parts.

SUBSTANCE: stretcher mechanism has contour follower composed of two rings connected with one another through pins so that outer ring may be offset relative to inner ring, followed by fixing of their relative position. Roller race for ball is provided on inner surface of race. Balancing load is adjustably fixed on one of pins. Torsion spring is positioned on spindle, with one end of spring being fixed on sewing machine stop and other end being fixed on finger with ball.

EFFECT: reduced power and inertial loads applied to main shaft of sewing machine and increased service life of stretcher mechanism.

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Description

The invention relates to sewing machinery, namely to sewing machines with disk conveyors.

Known sewing machine with disk conveyors (see US patent No. 4438711, D 05 B 15/00, D 05 B 27/10. 1984), containing a looper mechanism with a massive disk mounted on the main shaft of the sewing machine. At the end of the disk, a curved groove is made, in which a ball is installed with an opening in which a finger is located, mounted on an oscillating axis.

As a prototype, a sewing machine with disk conveyors was selected according to Russian patent No. 2202666, D 05 23/00, 35/00, 2003, in which the expander mechanism has a massive disk mounted on the main shaft. At the end of the disk, a groove is made in the form of a circle, the center of which is offset from the center of the disk. A ball is installed in the groove with a hole in which a finger is located, mounted on an axis that vibrates when the disk rotates.

The disadvantages of the known devices are:

- the large mass of the copier disk with an eccentric groove made of a whole piece of metal and rotating at a speed of 3000 rpm creates increased inertia in the sewing machine, which is undesirable in the machine for sewing gloves, because short seams are best done on a machine with low inertia of shaft rotation. This car should quickly accelerate and stop;

- the relatively short life of the ball, due to the fact that the ball is installed in the groove with a slight interference fit, so it is in contact with two tracks at two diametrically opposite points. When the disk rotates, the ball does not rotate, but glides along the tracks and this leads to its rapid wear;

- it is technologically difficult to make an exact groove with two tracks for the ball.

The problem to which the invention is directed, is to create a device with higher technical characteristics.

The technical result obtained by the implementation of the invention is to reduce the power and inertial loads on the main shaft of the sewing machine, to increase the service life of the mechanism, to increase the manufacturability of its manufacture.

The specified technical result is achieved in that in the mechanism of the expander of the sewing machine containing a copier mounted on the main shaft of the machine with a groove in the form of a circle made with an eccentricity relative to the axis of the main shaft, a ball with a finger fixed on an axis oscillating during rotation of the copier is new the fact that the copier is made in the form of two rings: an outer one with a raceway for a ball on the inner surface, and an inner ring interconnected by studs with the possibility of displacement of the outer ring relative Tel'nykh internal followed by fixing their mutual arrangement, with one of the pins is arranged to adjust the balance weight and the axle is installed a torsion spring, one end of which is fixed on the palm of the sewing machine, and the other - on the finger with the ball.

The above set of distinctive features in comparison with the prototype allows to reduce the inertia of rotation of the main shaft of the machine by reducing the mass of the disk, which ensures quick descent and stop of the machine - a necessary condition for sewing gloves;

- increase the life of the ball by replacing the sliding friction - rolling friction;

- change the eccentricity of the ball raceway, which allows you to change the amplitude of the oscillator expander. This is convenient when setting up prototypes;

- reduce vibration of the sewing machine due to the use of an adjustable balancing load in the disk;

- reduce technological difficulties associated with the manufacture of the disk.

Technical solutions with features distinguishing the claimed solution from the prototype are not known and do not follow explicitly from the prior art. This suggests that the claimed solution is "new" and has an "inventive step".

The essence of the proposed technical solution is illustrated by the drawing, where figure 1 shows the proposed mechanism of the expander; figure 2 is a full image of the mechanism of the expander in isometric projection.

The mechanism of the extender of the sewing machine consists of an outer ring 1 with a raceway "a" on the inner surface, and an inner ring 2 mounted on the main shaft 3 of the sewing machine, interconnected by studs 4. On the inner ring 2, the studs 4 are fixed with nuts 5. The outer ring 1 has the ability to offset relative to the inner ring 2 by a value of "b" (eccentricity), followed by fixing their relative position with nuts 6. On one of the studs 4 is located with the ability to move the balancing weight 7, which is intended Achen to eliminate the imbalance caused by the displacement of the outer ring 1 relative to the inner ring 2 by an amount of eccentricity "b". After adjustment, the load 7 is locked with nut 8. In the groove "a" of the outer ring 1, a ball 9 is installed with an opening in which the pin 10 of terminal 11 is located. Terminal 11 is fixed on the axis 12, which is mounted for rotation, by screw 13. On the same axis 12 a torsion spring 14 is installed, one end of which is fixed on the stop 15 and the other on the drum 10 with ball 9. The stop 15 is screwed into the body of the sewing machine (not shown in Fig. 1) and fixed with a nut 16. The inner ring 2 is fixed on the main shaft 3 screws 17. On the axis 12 (figure 2) is fixed to the gear sector 18, which engages the pinion shaft 19, the end of which is fixed, with the possibility of adjustment, the spreader 20.

The expander mechanism of the sewing machine operates as follows.

When starting the sewing machine, the main shaft 3 begins to rotate together with the inner ring 2 attached to it and the outer ring 1 connected by the pins 4. The ball 9, pressed by the spring 14 to the track “a” of the ring 1, starts to rotate on the finger 10, while remaining inside the track “a” of the ring 1. Since the track “a” of the ring 1 is offset relative to the inner ring 2 by the amount of eccentricity “b”, the finger 10 starts to oscillate in the vertical plane along with the terminal by the axis 12. The oscillations of the axis 12 around the center of rotation are transmitted through gear sector 18 on steam llelnuyu axis of the pinion 19, the end of which the spreader 20 is fixed.

Claims (1)

The mechanism of the extender of the sewing machine, comprising a copier mounted on the main shaft of the machine with a groove in the form of a circle made with an eccentricity relative to the axis of the main shaft, a ball with a finger fixed on an axis oscillating during rotation of the copier, characterized in that the copier is made in the form of two rings : outer with a raceway for the ball on the inner surface and the inner ring, interconnected by studs with the possibility of displacement of the outer ring relative to the inner one with subsequent fixation of their mutual location, while on one of the studs a balancing weight is located with the possibility of adjustment, and a torsion spring is installed on the axis, one end of which is fixed on the stop of the sewing machine and the other on the finger with a ball.

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