JP2584761Y2 - Sewing machine thread tensioner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread tensioner of a sewing machine for applying a predetermined tension to a sewing thread, and more particularly to a thread tensioner of a sewing machine for appropriately applying a tension from a low tension to a high tension.

[0002]

2. Description of the Related Art Between a thread supply source (thread thread) of a sewing machine and a sewing needle, there is provided a thread tensioner for preventing swing of the sewing thread and applying a predetermined tension to the sewing thread. FIG. 3 is an exploded perspective view showing the configuration of the thread tensioner of the sewing machine. In the drawing, reference numeral 1 denotes a support rod, which has a split groove 1 at one end in the longitudinal direction.
b and a screw portion 1a.

[0003] Reference numeral 4 denotes a thread tension plate comprising two circular plates. The thread tension plate 4 is slidably supported by a support rod 1, and one circular plate (left side in the figure) supports the support rod 1. Abuts on the supporting member 5 to restrict movement. Reference numeral 3 denotes a thread tension presser plate, which has a through hole 3a inserted into the split groove 1b of the support rod 1, and is provided so as to be slidable only in the longitudinal direction of the support rod 1.

[0004] Reference numeral 2 denotes a knob. The knob 2 has a screw portion 2a that is screwed into the screw portion 1a of the support 1. The knob 2 is turned to the support rod 1 by rotating the knob portion 2. It is possible to advance and retreat.

[0005] The thread tension device of the sewing machine configured as described above sandwiches a sewing thread in a thread tension plate 4 as shown in FIG.
A predetermined tension can be applied to the sewing thread by the urging force of the spring body B against the thread tension plate 4. The tension on the sewing thread can be adjusted by rotating the knob 2 and changing the biasing force of the spring body B.

[0006]

However, the thread tension controller of the conventional sewing machine shown in FIG. 3 has the following problems. Since the thread tensioner of the sewing machine shown in FIG. 3 applies a tension to the sewing thread only by frictional resistance, the tension may not be stable when the tension is weak.

That is, when the urging force applied to the thread tension plate 4 is weak, even if the urging force is constant, the tension of the sewing thread easily changes due to the difference in the thickness of the sewing thread and the frictional resistance. A very low tension could not be given.

When the tension on the sewing thread is reduced,
The sewing thread oscillates in the thread tension plate 4 so as to follow the up-and-down movement of a well-known balance for tightening the stitches, so that the tension on the sewing thread becomes unstable.

On the other hand, when the urging force on the thread tension plate 4 is increased so as to increase the tension on the sewing thread, the sewing thread is released in a direction in which the urging force is relaxed, ie, in a direction away from the center of the thread tension plate 4, as shown in FIG. In this case, a predetermined tension is not obtained, or a sewing thread is detached from the thread tension plate 4 to cause a defective seam in a formed seam.

[0010]

SUMMARY OF THE INVENTION A thread tensioner of a sewing machine according to the present invention is made to solve the above-mentioned conventional problem, and is rotatable between a thread tension plate and a support rod by a support rod. The present invention aims to solve the above-mentioned conventional problems by providing a roller supported by a sewing machine, winding the sewing thread around the roller, and sandwiching the thread in a thread tension plate.

[0011]

In the thread tensioner of the sewing machine according to the present invention, a sewing thread is wound around a roller rotatably supported by a support rod, the sewing thread is sandwiched by a thread tension plate, and the sewing thread is fed while rotating the roller. To do. As a result, even when the urging force on the thread tension plate is weak, a constant low tension corresponding to the rotation resistance of the roller is applied to the sewing thread regardless of the type of the sewing thread, and the sewing thread tension in the thread tension plate due to the vertical movement of the balance of the sewing machine. To prevent rocking.

Further, it is possible to prevent the movement of the sewing thread in the thread tension dish and the detachment of the sewing thread from the thread tension dish when the attached force to the thread tension dish is strong.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The same parts as in the conventional example are denoted by the same reference numerals, and redundant description will be omitted. FIGS. 1 and 2 show an embodiment of the present invention.

In FIG. 1, A is a roller.
Is rotatably supported by a support rod 1 and a thread tension plate 4
Are supported by the rollers A so as to be able to move forward and backward. The roller A has a sewing thread insertion groove A1. The movement of the support bar 1 in the longitudinal direction is restricted by the thread tension presser plate 3 and the support 5.

The sewing thread is set on the thread tensioner of the sewing machine configured as described above so as to be wound around the roller A as shown in FIG. When the sewing machine is driven, the thread tensioner of the sewing machine sends the sewing thread while rotating the roller A by the movement of the sewing thread, and even when the urging force on the thread tension plate 4 is reduced, the rotation resistance of the roller A is reduced. A constant low tension can be applied to the sewing thread.

Further, the sewing thread engaged so as to be wound around does not largely swing in the thread tension plate 4 due to the vertical movement of the balance or the like even when the urging force on the thread tension plate 4 is weak. . On the other hand, even when the urging force on the thread tension plate 4 is increased, the sewing thread wound around the roller A does not move in the thread tension plate 4 (see FIG. 5) and comes off the thread tension plate 4. Not even.

[0017]

As described above, the thread tension device of the sewing machine according to the invention is provided with a roller rotatably supported by the support bar between the thread tension plate and the support bar, and the sewing thread is transferred to the roller. Since the thread is wound and sandwiched between the thread tension discs, even when the urging force of the thread tension disc is weakened to weaken the tension on the sewing thread, it is possible to apply a constant low tension to the sewing thread by the rotation resistance of the roller. It is possible to prevent the sewing thread from swinging in the thread tension plate due to the vertical movement of the balance of the sewing machine.

Further, it is possible to prevent the movement of the sewing thread in the thread tension dish when the urging force of the thread tension dish is increased so as to increase the tension on the sewing thread, and to prevent the detachment of the sewing thread from the thread tension dish. An appropriate seam can be formed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a thread tensioner of a sewing machine according to the present invention.

FIG. 2 is an explanatory view showing a setting state of a sewing thread of the thread tensioner of the sewing machine shown in FIG. 1;

FIG. 3 is an exploded perspective view showing a configuration state of a thread tensioner of a conventional sewing machine.

FIG. 4 is an explanatory diagram showing a state in which a sewing thread is set in a thread tensioner of the sewing machine of FIG. 3;

FIG. 5 is an explanatory view showing a state of movement of a sewing thread in the thread tension plate when the urging force on the thread tension plate is increased in the thread tension device of the sewing machine shown in FIG. 3;

[Explanation of symbols]

 A roller B spring body 1 support rod 2 knob 4 thread tension plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A support rod having a cylindrical shape, a knob which is screwed into a thread formed at one end of the support rod and whose position can be adjusted forward and backward, is slidably supported by the support rod, and sandwiches a sewing thread. A thread tension plate composed of two circular plates, and a spring body that has one end in contact with the knob portion and the other end in contact with one of the thread tension plates, and changes the urging force to the thread tension plate depending on the position of the knob portion. In the thread tensioner of the sewing machine provided, a roller rotatably supported by the support rod is provided between the thread tension plate and the support rod, and the sewing thread is wound around the roller,
A thread tension device of a sewing machine characterized by being sandwiched between thread tension plates.