JPS5817636B2 - How to attach a sewing machine needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for attaching a sewing machine needle, and more specifically, a method for attaching a sewing machine needle to a needle bar securely and, if necessary, arranging the needle in a constant direction with respect to the axial direction of the needle bar. This invention relates to an improvement in the needle holder of a sewing machine for attachment.

Attaching the sewing machine needle securely to the needle bar is a task that requires a surprising amount of skill.

As is well known, the distance between the sewing machine's cloth presser (or throat plate) and the lower end of the needle bar is short, and the only way to insert the needle into the needle holder is by feeling around, so installing the needle is a work in progress. There are surprisingly many accidents in which the needle is accidentally dropped into the hook (rotary shuttle), the needle tip hits a finger, or the needle tip is broken due to poor installation.

In addition, even if the installation direction is parallel to the needle bar axis, if the needle hole is not perpendicular to the upper thread feed direction, it may cause malfunctions such as poor stitches (such as skipped stitches or diagonal stitches) or thread breakage. Become.

However, in the case of household sewing machine needles, the upper mounting part (stem) of the needle has a semicircular semicircular cross section, and by fitting the flat part to the bottom of the groove carved in the needle holder, it is possible to avoid accidental errors. Although the product is designed to be difficult to install incorrectly, incorrect installation is often overlooked.
The problem was often blamed on the failure of the sewing machine itself.

This needle attachment problem is even more serious in industrial sewing machines.

Since the cross-section of the needle is circular, it is difficult to attach the needle accurately, and as the hands are moved at a speed that is incomparable to that used in home use, even minute attachment errors are likely to cause serious problems.

For this reason, especially in the case of a multi-needle sewing machine, a great deal of effort is required to accurately attach the needles.

One of the main objects of the present invention is to make it simple and easy for both beginners and experts to quickly and easily install a needle accurately.

Another object of the present invention is that the needle attachment eliminates the accident of dropping the needle during operation.

Still another object of the present invention is to prevent the needle from falling off even if the needle becomes loose during sewing operations.

Other objects and effects of the present invention will be apparent to those skilled in the art.

The present invention attempts to solve the above problem by providing hard magnetism to the needle seat portion of the needle seat bar of a sewing machine.

This concept has the advantage of being able to apply the best magnetic material to the most appropriate location.

The gist of the present invention is that the needle support of a needle bar in a sewing machine has hard magnetic properties, that is, permanent magnetic properties.

In order to realize the above concept, in the present invention, a thin plate of hard magnetic material is embedded in the groove bored on the bottom surface of the needle receiving groove, or a transparent hole or a blind hole is bored in the bottom surface of the needle receiving groove. A method is adopted in which a small piece of hard magnetic material is embedded inside.

According to these means, it is not necessary to make the entire needle support (needle bar) from a hard magnetic material, so the cost can be reduced, and furthermore, the most suitable material can be selected for the needle support itself, which is advantageous.

In particular, the method of fitting a small cylindrical rubber magnet into a hole passed through a needle holder is the most popular method, not only because it is easy to manufacture, but also because high-quality rubber magnets have recently appeared. Seems practical.

Hereinafter, one or two embodiments will be described in accordance with the above explanation.

For example, in the needle holder 1 of a sewing machine shown in FIG. 1, a thin plate 3 made of a hard magnetic material such as ferrite or alnico 5 is bonded to the bottom surface of the needle holder groove 2.

Therefore, as shown in FIG. 2, when a normal sewing machine needle 4 is inserted into the needle receiving groove 2, the suction force exerted by the thin plate 3 causes the stem portion 4' to accurately come into close contact with the bottom surface of the branch groove.

In addition, since the needle 4 does not fall off even when the screw 5 is loosened, there is no risk of accidentally dropping the needle into the inside of the machine or onto the floor during work when replacing or installing the needle.

The embodiment shown in FIG. 3 has a needle bar 1 of a different type from that shown in FIG.
This is an example in which a through hole 6 or a blind hole (not shown) is bored in the bottom surface of the needle receiving groove 2', and a small cylinder 7 made of a hard magnetic material such as a rubber magnet is embedded in the hole.

The needle 4, which is inserted into the groove 2' with the flat surface of the stem 4' facing inside, comes into close contact with the bottom surface of the groove 2' as in the case of FIG.

Incidentally, this method is the most practical as a means of embodying the invention.

Although typical embodiments of the invention have been described above, these are merely examples and do not mean a limitation on the conceptual scope of the invention.

For example, in addition to pasting or embedding a hard magnetic material, baking or coating of a magnetic material can also be performed as required.

With the above configuration, the present invention has effects such as simplifying and ensuring needle attachment and preventing the needle from falling off during attachment or during operation, and therefore has great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a situation in which the invention is implemented in a needle holder. 2 is a vertical sectional view of the needle holder shown in FIG. 1 with the needle attached; FIG. FIG. 3 is a vertical sectional view showing the same invention applied to another type of needle holder. The meanings of each symbol in the figure are as follows: Knee 1.1'...needle holder, 2,2'...needle holder groove, 3...fur light thin plate, 4...Sewing machine needle, 5...Fixing screw, 6...Through hole, 7...Small cylinder made of hard magnetic material.

Claims (1)

[Scope of Claims] 1. A method for attaching a sewing machine needle, which comprises embedding a thin plate or small column made of a hard magnetic material in a portion of the needle receiving groove of the sewing machine that comes into contact with the stem of the needle. 2. The method according to claim 1, wherein the hard magnetic material is a rubber magnet, and the magnet is inserted and embedded in a hole drilled in the needle bar in the needle receiving groove portion in the form of a small columnar body. .