JPS5934464Y2 - Sewing machine drive control device - Google Patents

Description

[Detailed description of the invention] This invention relates to a drive control device for a sewing machine, and is particularly applicable to sewing machines in which the main shaft is directly connected to the motor via a belt, and the main shaft rotates in synchronization with the motor. After completing one rotation, the spindle is forcibly stopped against the power of the motor, and then the controller is released, and the spindle returns to a rotatable state, making it possible for the worker to make a single stitch. This invention relates to a drive control device for a sewing machine that allows sewing to be performed.

Conventionally, this type of drive control device includes a clutch mechanism interposed between the motor and the main shaft, but all of these conventional devices have complicated mechanisms and high manufacturing costs, and are not suitable for home-use machines. It was inappropriate.

Those with a clutch mechanism that were broken had the disadvantage that the main shaft would idle due to inertia even after the motor power was cut off, and the stopping position of the needle bar would therefore be inconsistent.

Examples of this invention will be described below with reference to the drawings.

A pulley 2 corresponding to a pulley of a motor is fixed to a main shaft 1 rotatably supported on a machine frame, and the main shaft 1 is provided to rotate in conjunction with the motor via a transmission belt.

The rotating body 3 fixed to the shaft end of the main shaft 10 protruding outside the machine frame has two cam parts 3 at different positions in the direction of its rotational axis.
a, form 3b.

One end of the link 5 is rotatably supported by a step screw 4 against the machine frame, and the other end of the link 5, which is arranged approximately horizontally, has two retaining parts 6a corresponding to the cam parts 3a and 3b of the rotating body 3 at the upper part. , 6b is rotatably supported by a step screw 7 at the middle of the stop lever 6.

A coil spring 8 is passed between the enclosed stop lever 6 and the machine frame, and the link 5 is normally pressed and held against the stopper 9 fixed to the machine frame, and in this state, one engaging portion of the stop lever 6 is 6
a is located within the rotation path of one cam portion 3a of the rotating body 3.

Furthermore, by movably locking the selection means 10 having the pin 10a corresponding to the lower part of the stop lever 6 from outside the □shin, the stop lever 6 is rotated by the elastic force of the coil spring 8, and one of the selection means 10 is locked by the elastic force of the coil spring 8. A position where the portion 6a enters the rotation path of one of the cam portions 3a of the rotating body 3, and a position where the engaging portion 6a rotates against the coil spring 8 and is separated from the rotation path of the cam portion 3a. It is set up so that it can be moved.

Note that one cam portion 3a of the rotating body 3 is connected to the stop lever 6.
The stop lever 6 is protruded in the radial direction so as to move against the coil spring 8 to a position where the engaging part 6b enters the rotation path of the cam part 3b in connection with engaging with the engaging part 6a of the cam part 3b. The other cam portion 3bH of the rotary body 3 is formed so that the stop lever 6 is pressed upward against the coil spring 8 and rotates counterclockwise around the step screw 7, and at this time. A blocking body IL11' is arranged to prevent clockwise rotation of the link 50 and counterclockwise rotation of the stop lever 6.
is fixedly arranged corresponding to the stop lever 6.

This invention has the above configuration, and its operation will be explained next.

Figure 2 shows the sewing machine when it is stopped, with the thread take-up raised to its highest position and the needle bar slightly lowered from its highest position.When the controller is depressed to drive the motor, the rotating body 3 rotates clockwise together with the main shaft 1. As shown in Fig. 3, the main shaft 1 is
Slightly before rotation, one cam portion 3a of the housing engages with one engaging portion 6a of the stop lever 6, and the stop lever 6 is pressed upward against the coil spring 8, thereby causing the rotating body 3 to rotate. When the other cam part 3a engages with the other engaging part 6b of the stop lever 6, the stop lever 6 is pressed diagonally upward and to the left against the coil spring 8 (Fig. When rotated in the forward direction, the stop lever 6 rotates counterclockwise around the step screw 7 against the coil spring 8, as shown in FIG.
After one engaging part 6a comes off from the cam part 3a, the blocking body 1
1' and moves slightly upward to block the blocking body 1.
1.

In this state, the engaging portion 6b remains in the rotational path of the cam portion 3b, and the rotating body 3, that is, the main shaft 10, is prevented from rotating 10 times.

This state is maintained as long as the controller is depressed, and when the controller is released from the state shown in Figure 5, the power to the motor is cut off and the main shaft 1 can rotate freely. Due to the elastic force of the coil spring 8, the stop lever 6 slightly pushes back the rotating body 3, returning it to the state shown in FIG.

Thereafter, in the same manner, each time the controller is depressed, the main shaft rotates once and stops, and one stitch is formed as desired by the worker.

Next, when the selection means 10 is operated to move the pin 10a to the right in FIG. 6a, 6
b is the cam portion 3a of the rotating body 3;

3b, so when the controller is depressed, the main shaft 1 rotates continuously and a normal continuous stitch is formed.

As described above, this invention consists of a rotating body that is fixed to the main shaft and has two cam parts at different positions in the rotation direction, two retaining parts corresponding to each cam part of the rotating body, and one engaging part. A stop lever is configured such that in response to the engagement of the other cam part of the rotating body, the other engaging part enters into the rotation path of the other cam part of the rotating body, and the other engaging part of the stop lever. A structure comprising: a blocking body fixed to the machine frame so as to restrain movement of the stop lever and prevent rotation of the rotating body in relation to engagement between the joint part and the other cam part of the rotating body; Because of this, the mechanism is simple and the stopping operation is reliable, and the manufacturing cost can be reduced.

The main shaft is stopped mechanically and forcibly against the rotational force of the motor by the engagement of the stopped lever and the rotating body, so the stopping position of the needle bar is constant, and the needle bar is rotated... Since there is no need to correct the stopping position of the needle bar each time, the operation is simple and work efficiency is improved.

In the above embodiment of this invention, the stop lever is rotatably supported on the free end of a link that can swing around a fixed axis, but it can also be moved, for example, by sliding up and down with respect to the machine frame. Even if the above-mentioned stop lever is rotatably supported by a square piece that can be rotated, and the other components are constructed in the same manner as in the above-mentioned embodiment, the same effect as described above can be obtained.

In the above embodiment of this invention, the two cam parts of the rotating body are formed at different positions in the direction of the rotation center axis, but it is possible to form the two cam parts on the same circumference at different positions in the rotation direction. However, the same effect as described above can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The first part is a perspective view of the main parts, and FIGS. 2 to 5 are action explanatory views. In the figure, 1 is a main shaft, 3 is a rotating body, 6 is a stopper, and 11, 11' is a blocking body.

Claims (1)

[Claims for Utility Model Registration] A main shaft 1 supported on a machine frame and rotating in conjunction with a motor, an operating means that can be manually operated to stop driving the sewing machine motor, and an operating means fixed to the main shaft and configured to control the direction of rotation of the main shaft. A rotating body 3 that has two cam parts 3a and 3b integrally formed at two different positions in the axial direction, and a link 5 that can swing around a fixed axis parallel to the main shaft.
and a stop lever 6 which integrally forms two engaging parts 6at6b corresponding to the cam part of the rotating body and is rotatably supported on the free end of the link; enters the rotation path of one cam part, and the other engaging part is separated from the rotation path of the other cam part, and one engaging part engages with the other cam part by the drive of the motor. The two engaging parts move forward in one direction in the direction of separation, and the other retaining part enters the rotation path of the other cam part, and the other engaging part engages with the other cam part and moves further. an elastic body 8 having an elastic force that allows one of the retaining parts to move out of the rotational path of one of the cam parts when the motor moves, and returns it to its original position when the motor is stopped; A drive control device for a sewing machine, comprising a blocking body IL11' fixed to a machine frame so that one retaining part blocks forward movement of a stop lever due to a stop lever at a position separated from one cam part.