JPS60863Y2 - Threader for sewing machine looper - Google Patents

Description

[Detailed description of the invention] This invention relates to a threader for a louver, and in particular, the side surface of the tip of a needle-shaped body having a smaller diameter than the threading hole of the looper is formed into a smooth surface, and the smooth surfaces are opposed to each other. The bent portions are bent so as to overlap each other so that the entire diameter of the bent portions is smaller than the threading hole of the looper, and a thread holding portion is formed inside the bent tip, and a smooth surface is continuously pressed against the thread holding portion. and a thread insertion part that expands so that only the opposing smooth surfaces are separated for thread insertion were successively formed.

In general, threading thread through the looper of a sewing machine, particularly the lower looper, is considered to be troublesome due to the shape and location of the looper.

Various threaders have been provided that make it easy to thread the thread through the threading hole of the looper, but none of them can be said to be sufficient in terms of operability and functionality. .

In particular, the lower looper has a threading hole at its base and a threading hole at its tip, but all threaders can only thread the thread through the threading hole at the base. However, at present, threading into the threading hole at the point of the sword is still done using tweezers or the operator's fingers.

Therefore, it must be said that conventional threaders were completely incomplete, especially with regard to the lower looper, and users of sewing machines equipped with a lower looper are still not freed from the hassle of threading. It was also troublesome to maintain the accessories, such as the need to prepare tweezers and the like.

This invention solves such problems regarding conventional threading in a looper, and its purpose is to facilitate threading through the threading hole of the looper. In particular, it is possible to thread the thread continuously through the threading hole at the base of the lower looper and the threading hole at the tip of the blade using a single threader. The purpose is to provide a threader.

That is, in this invention, as in the illustrated embodiment, the side surface of the tip 5 of the needle-like body 4 having a smaller diameter than the threading holes 2 and 3 of the looper 1 is formed into a smooth surface 6, and the tip of the needle-like body 4 is formed into a smooth surface 6. The part 5 is bent so that the smooth surfaces 6 face each other and overlap each other, so that the diameter of this part as a whole is smaller than the threading holes 2 and 3, and a loop-shaped part is formed inside the bent tip part 7. Thread holding part 8
At the rear of the thread holding part 8, there is only a press-contact part 9 formed by the elastic force of the needle-like body 4 and the smooth surfaces 6, 6 that continuously face the press-contact part 9. The present invention relates to a threader for a looper of a sewing machine, which is configured with a thread insertion section 10 that is separated and expanded in sequence.

In this invention, various materials can be used for the needle-shaped body, but a wire such as stainless steel is most suitable.

The tip of such a needle-like body has a smaller diameter than the threading hole of the looper, and its side periphery is formed with a notched smooth surface to make it even thinner.

The tip portion is bent so that the smooth surfaces face each other and overlap.

A loop-shaped thread holding part is formed inside the bent tip part, and furthermore, behind this part, there is a pressure contact part where the smooth surface comes into pressure contact with the elasticity of the needle body, and a pressure contact part where the smooth surface is separated from the other part. Thread insertion portions that expand in this manner are sequentially formed.

The entire bent portion is configured to be smaller than the threading hole of the looper.

According to this threader, the tip of the needle-shaped body is inserted into the threading hole of the looper, and in this state, the thread is pushed through the thread insertion part, passes through the pressure contact part, and is held in the thread holding part.

Then, when the thread is removed from the threading hole of the looper, the thread is passed through the threading hole.

At this time, the threader has a needle-shaped body whose tip is smaller than the threading hole of the looper, and the overall diameter of the bent tip is smaller than the threading hole of the looper. 1. Since the thread insertion part has a thread insertion part that expands so that only the opposing smooth surfaces are separated from each other, it is extremely easy to insert the thread into the threading hole, remove it therefrom, and manipulate the thread.

Moreover, the structure is extremely simple since it is made by bending a needle-like body.

In particular, after passing the thread through the threading hole at the base of the lower looper, it can be inserted directly into the threading hole at the tip of the sword, which is extremely convenient.

Embodiment FIGS. 1 and 2 show the entire threading device of this invention.

The needle-like body indicated by 4 in the figure is made of a wire made of stainless steel or the like, and its entire diameter is smaller than that of the threading hole of the looper, and its rear portion is configured as a grip portion 11.

The grip part 11 has a roughly rectangular knob 1 made of synthetic resin.
2 is installed.

A thread cutting section 14 having the same diameter as the needle-shaped body 5 and having a thread cutting claw 13 at the tip is rotatably attached to the center of the knob 12.

This thread cutting part 14 is accommodated in a stepped part 15 formed on one surface of the knob 12, and is moved in the opposite direction from the needle-shaped body 4 by a locking protrusion 16 provided opposite to this stepped part 15. It is designed to be latched in an extended position.

Then, by removing the thread cutting part 14 from the locking projection 16 and turning it in the direction of the arrow in FIG. 2, it can be placed side by side with the needle-like body 4 and brought into a so-called folded state.

By forming the entire part into a concave shape instead of the step part 15 and the locking protrusion 16 opposite thereto, the thread cutting part 14 has the following features:
Can be rotated to both sides.

In FIGS. 1 and 2, reference numeral 17 indicates a pivot portion of the thread cutting portion 14.

As shown in FIGS. 3A and 3B, the tip 5 of the needle-like body 4 is configured to have a smaller diameter than the threading hole 2 of the looper.

The side surfaces thereof are cut into smooth surfaces 6, and are bent so that the smooth surfaces 6 face each other and overlap.

A loop-shaped thread holding section 8 for holding the thread is formed inside the bent tip 7.

The thread holding portion 8 is formed by further notching a portion of the smooth surface 6 corresponding to the bent tip portion 7 over a certain length.

At the rear of this thread holding part 8, as mentioned above, there is a pressure contact part 9 in which the smooth surfaces 6 that are not cut out parts are pressed together by the elasticity of the needle body 4 itself, and a pressure contact part 9 where the smooth surfaces 6 that are not cut out parts are pressed together by the elasticity of the needle body 4 itself, and the tip of the needle body 4. The opposing smooth surfaces 6 of the tip of the portion 5 that points rearward due to the bending and the starting portion of the cut-out portion are gradually spread apart. A thread insertion section 10 is formed.

Further, the outer surface of the rearwardly oriented free end of the thread insertion portion 10 is cut out 18 so as to point toward the core of the needle-like body 4 toward the rear.

This facilitates the insertion and removal of the looper into and from the threading hole.

Of course, the rearwardly directed free end of the thread insertion section 10 may be formed into a sharp point like a needle tip.

Figures 4 and 5 show the threader of this invention in the lower looper 1.
The method of use is shown step by step in an explanatory manner.

That is, the needle-shaped body 4 of the threader is inserted into the threading hole 2 formed at the base of the lower looper 1 with its tip 5 having the above-described configuration.

Then, with the tip portion 5 completely pushed out to the back of the lower looper 1, the lower looper thread t is moved from the position indicated by the two-dot chain line in the direction of the arrow and placed at the position indicated by the solid line.

Then, the lower looper thread t enters through the thread insertion part 10 formed at the tip 5 of the needle-like body 4, spreads out the pressure contact part 9, reaches the thread holding part 8, and is held there.

Next, as shown in FIG. 5A, when the tip 5 of the needle-like body 4 is retreated and removed from the threading hole 2, the lower looper thread t passes through the threading hole 2 in the form of a loop.

Then, as shown in FIG. 5B, while the lower louver thread t is hung on the thread holder 8, the tip 5 of the needle-shaped body 4 is inserted into the threading hole 3 at the tip of the needle.
When the lower louver thread t is fully inserted into the threading hole 3, the lower louver thread t is inserted into the threading hole 3 with the louver at 2°.

Next, as shown in No. 511fflC, when one side of the lower looper thread t is slightly pulled in the direction of the arrow, the loop portion becomes smaller and the lower looper thread t pushes open the pressure contact part 9 and passes through the thread insertion part. It's out of 10.

Although not shown, the tip 5 of the needle-shaped body 4 is pulled out from the threading hole 3 when it retreats, and only the lower looper thread t remains in the threading hole 3.

Finally, as shown in the fifth diagram, the thread cutting claw 13 of the thread cutting section 14
The loop portion is cut and pushed in the direction of the arrow to remove the yarn end from the threading hole 3.

As described above, according to this embodiment, threading the looper, especially the lower looper, can be carried out extremely easily and accurately, and the structure of the threader is simple. Of course, this looper threader can also be applied to threading through the threading hole of the upper looper.

[Brief explanation of drawings]

1 is a front view of the embodiment, FIG. 2 is a plan view thereof, FIG. 3A is a front view of the tip of the needle-shaped body, FIG.
The figure is a front view showing the initial state in which the threader of this invention is used in a looper, and FIGS. 5A to 5D are explanatory diagrams showing how to use the threader according to the operating order. In the figure, 1 is a looper, 2 and 3 are threading holes, 4 is a needle-shaped body, 5 is a tip, 6 is a smooth surface, 7 is a bent tip, 8 is a thread holding part, 9
10 is a pressure contact part, and 10 is a thread insertion part.

Claims (1)

[Scope of utility model registration request] The side surface of the tip of a needle-like body having a smaller diameter than the threading hole of the looper is formed into a smooth surface, and the tip of the needle-like body is bent so that the smooth surfaces face each other and overlap to determine the overall diameter of this part. The waist is configured to be smaller than the threading hole, and a loop-shaped thread holding part is formed inside the bent tip of the thread holding part, and a loop-shaped thread holding part is formed behind the thread holding part, and the thread holding part is biased by the elasticity of the needle-like body. A thread threader for a looper of a sewing machine, comprising a pressure contact part and a thread insertion part in which only the smooth surface facing the pressure contact part is spaced apart and widened.