JPH0217579Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) The invention is a sewing needle that allows easy threading.
It relates to needles such as sewing machine needles and woolen needles.

(Prior Art) Generally, a sewing needle is a short rod made of thin steel, one end of which is sharpened for piercing cloth, and the other end of which has a needle hole for threading thread. When threading the thread through the needle hole, it is necessary to thread the thread through the small diameter needle hole without fraying the tip of the thread, and it is difficult to thread the thread through the needle hole in one go unless you are a skilled person, especially if you have poor eyesight. For some people, threading is a bigger job than actual needlework, which is one reason why they avoid sewing. For this reason, as disclosed in, for example, Japanese Utility Model Publication No. 55-1571,
Sometimes threading is done using a threader with a thin wire loop. Further, Japanese Utility Model Application Publication No. 58-88981 proposes a needle at least partially made of a shape memory alloy.

(Problem that the invention aims to solve) Even if the former conventional threader is used, the needle hole is originally small in diameter, so although it can help to some extent, it is still difficult, and the threader is expensive and difficult to handle. Not only is it troublesome, but it also has the problem of being more time-consuming because it basically has to be prepared separately from the needle. Furthermore, in the latter conventional technique, threading was difficult because the needle hole itself was small in diameter.

The present invention was developed based on the above-mentioned problems, and an object of the present invention is to provide a needle that is integrated with the needle and allows easy threading of the thread.

[Structure of the invention] (Means for solving the problem) The present invention has a needle hole, and the diameter of the needle hole becomes small at a low-temperature transformation temperature set to room temperature, and the diameter of the needle hole decreases at a high-temperature transformation temperature. A shape memory alloy that has a shape memory that increases the diameter is connected to the needle body.

(Function) When threading thread through a needle hole, the shape memory alloy is heated to increase the diameter of the needle hole, making it easier to pass the thread through. During sewing, the shape memory alloy cools down to room temperature and the diameter of the needle hole becomes smaller.
You can now sew as usual.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. Reference numeral 1 denotes a needle body intended for sewing needles, which is formed by sharpening one end of a steel rod. 2 is a shape memory alloy formed separately and fixed to the other end of the needle body 1. This shape memory alloy 2 is an alloy that once memorizes a certain shape and returns to its original shape when the set temperature is reached, including nickel-titanium (Ni-Ti) alloy, copper-zinc alloy, etc. - Aluminum (Cu-Zn-Al) alloy, gold-cadmium (Au-Cd) alloy, etc. are used, and this shape memory alloy 2 has a low-temperature transformation temperature that is lowered to room temperature as shown in Figure 1A. The shape memory alloy 2 has a shape memory to form a needle hole 4 having a diameter similar to that of the needle body 1 and having a small diameter through which the thread 3 can be inserted, and as shown in FIG. 1B. The high-temperature side transformation temperature is set to a high temperature, for example, about 50 to 100°C, and the shape is memorized to form a needle hole 5 with a large diameter that allows the thread 3 to pass through easily.

The operation of the present invention configured as above will be explained.

To thread the thread 3 through the needle, the shape memory alloy 2 connected to the needle body 1 is immersed in hot water at a temperature of about 50 to 100°C to warm it. As a result, shape memory alloy 2
When the temperature reaches the high-temperature transformation temperature, the shape memory alloy 2 senses the temperature and a needle hole 5 with a large diameter is formed. This needle hole 5 can have a diameter larger than the thickness, that is, the outer diameter, of the needle body 1, and the needle body 1 is taken out of the hot water and the thread 3 is passed through this large diameter needle hole 5. Therefore, threading the thread 3 can be performed very easily.

Then, when the temperature of the shape memory alloy 2 taken out from the hot water decreases to room temperature, the shape memory alloy 2 senses the temperature, and as a result, the shape memory alloy 2 becomes as thick as the needle body 1, and The diameter of the needle hole 4 is large enough to allow the normal thread 3 to be inserted therethrough, and sewing can be performed in this state. in this way,
When threading the thread 3 through the needle body 1, the shape memory alloy 2 is soaked in hot water and warmed to enlarge the needle hole 5 to make it easier to pass the thread 3 through.When sewing, the shape memory alloy 2 is heated until it returns to room temperature. Since the needle hole 4 returns to a normal needle hole that allows the thread 3 to move, there is no problem with sewing. Therefore, the needle itself also serves as a threader and the needle hole 5 becomes larger.
Even people with poor eyesight can easily thread the thread, making it extremely convenient. Further, as long as there is a heat source, no other accessories are required, and the device is easy to handle. In addition to immersing the shape memory alloy 2 in hot water, there are various methods for heating the shape memory alloy 2, such as blowing hot air with a hair dryer or bringing a heating element into contact with it. Further, since the needle body 1 is made of steel, a strong adhesive has been developed and can be used to join the needle body 1 and the shape memory alloy 2. Furthermore, as long as the material of the shape memory alloy 2 is capable of forming a needle, the needle body 1 and the shape memory alloy 2 can be integrally formed. Furthermore, by setting the low-temperature side transformation temperature to room temperature, the needle hole 4 naturally becomes smaller in diameter during sewing, making it easier to use.

FIG. 2 shows a second embodiment of the present invention, in which when the needle body 1 and the shape memory alloy 2 are bonded with adhesive, the bond can be made stronger by bonding their oblique bonding surfaces 6. . Furthermore, if the bonding surfaces 6 are provided with recesses and recesses that fit into each other, the bonding can be made even stronger.

FIG. 3 shows a third embodiment of the present invention. In the case of a sewing machine needle and a target needle body 1, since the base end is fitted into the sewing machine, a needle hole 4 is formed in the middle part of the needle body 1. , 5 is provided. Since it is difficult to remove the needle body 1 from the sewing machine each time the thread 3 is threaded, in this case, the sewing machine is equipped with a special heating element, and when the thread 3 is threaded, the heating element is applied to the shape memory alloy 2. A needle hole 5 with a large diameter is obtained as shown in FIG. 3B, and a normal needle hole 4 with a small diameter is obtained as shown in FIG. 3A.

Although the embodiments of the present invention have been described in detail above, they can be modified as appropriate within the scope of the gist of the present invention. For example, the high-temperature transformation temperature of shape memory alloy 2 is set to 50 to 100.
℃, but the temperature is not limited to this as long as it can be easily applied to the needle at home. Further, the shape and size of the large-diameter needle hole 5 can be modified in various ways as long as the thread 3 can be easily passed therethrough.

[Effects of the invention] As detailed above, the invention has a needle hole, and the diameter of the needle hole becomes small at the low-temperature transformation temperature set to room temperature, and the diameter becomes large at the high-temperature transformation temperature. By providing a shape memory alloy that has a shape memory such that the needle body has a shape memory, it is possible to provide a needle that is integrally provided with the needle and allows easy threading of the thread.

[Brief explanation of the drawing]

Fig. 1 shows the first embodiment, Fig. 1A is a perspective view during normal operation, Fig. 1B is a perspective view during threading,
FIG. 2 is a perspective view showing the second embodiment, and FIG. 3 is a perspective view showing the third embodiment.
An example is shown, and FIG. 3A is a front view during normal operation, and FIG. 3B is a front view during threading. 1... Needle body, 2... Shape memory alloy, 4... Small diameter needle hole, 5... Large diameter needle hole.

Claims (1)

[Scope of utility model registration request] A shape memory alloy is connected to the needle body, which has a needle hole and has a shape memory such that the needle hole becomes small in diameter at a low-temperature transformation temperature set to room temperature and becomes large in diameter at a high-temperature transformation temperature. A needle that is characterized by: