JPH0748231Y2 - Sewing machine thread guide - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a thread guide for a sewing machine, and more specifically, it is provided between a sewing machine balance and a sewing needle.
The present invention relates to a thread guide tool for a sewing machine that moves up and down together with a sewing needle.

[0002]

2. Description of the Related Art As shown in FIG. 5, between a balance 1 of a sewing machine M and a sewing needle N, unnecessary runout (oscillation) of a sewing thread (upper thread) is prevented, and the sewing thread at the time of forming a seam is prevented. A thread guide A of the sewing machine is provided so that the amount of delivery is appropriate.

As is well known, the sewing machine raises and lowers a sewing needle N, and by the raising and lowering movement of the sewing needle N, a thread loop is formed below a workpiece (not shown), and a rotary hook provided in a sewing machine table T is provided. Sewing thread (bottom thread) held by this thread loop and rotary hook by catching this thread loop (not shown)
A predetermined seam is formed by intersecting and.

When the sewing thread is undesirably moved (oscillated) due to the vertical movement of the sewing needle N in the formation of the seam by such a sewing machine, the sewing thread loop naturally formed below the workpiece is also swung (oscillated). Motion),
This causes a problem that the rotary hook cannot properly catch the yarn loop.

Further, when the amount of the sewing thread fed below the material to be sewn by the ascending / descending movement of the sewing needle N is too small,
Alternatively, if the amount is too large, inconvenience occurs.

[0006] That is, when the unwinding amount is small and the formed thread loop is small, the rotary hook does not reach the thread loop and cannot be caught, or the sewing thread is not properly caught by the hook point of the hook. This leads to inconveniences such as being stabbed and cutting the sewing thread.

When the amount of sewing thread to be fed out is large and the thread loop to be formed is large, the thread loop is tilted or falls down, which causes a problem that the rotary hook cannot properly capture the thread loop.

The thread guide of the sewing machine is provided to eliminate the above-mentioned inconvenience, and the thread guide A moves up and down together with the sewing needle N, as shown in FIG. Is fixed to the needle bar 2 which holds and is moved up and down by screws or the like.

As thread guides for such sewing machines, thread guides shown in FIGS. 6 to 8 have been proposed today.

The thread guide A of the sewing machine shown in FIG. 6 has two thread holes penetrating in the horizontal direction with respect to a plate body 4 which is provided on the fixed body 3 so as to extend vertically. The sewing thread is inserted into the hole as shown in the figure and used.

Further, the thread guide A of the sewing machine shown in FIG. 7 is provided with two projecting portions on the fixed body 3, and thread holes that are vertically and horizontally penetrated are formed in these two projecting portions. As shown, a sewing thread is inserted and used.

In the thread guide A of the sewing machine shown in FIG. 8, a projecting portion is provided at the lower end of the fixed body 3, a thread hole is formed vertically through the projecting portion, and a sewing thread is inserted into this thread hole. To use.

However, the thread guide A of each of the above-mentioned sewing machines
Has the following problems. Each thread guide tool A shown above
Since there are only one or two hooking points for hooking the sewing thread, the amount of slack in the thread at the threading point (thread hole) increases, and the thread slackens at this threading point, causing the thread to fall below the sewing needle. This causes the inconvenience of swinging the yarn loop formed on the.

Further, in particular, the thread guide A of the sewing machine shown in FIG.
In the above, since the sewing thread is greatly bent at the two thread holes, when the sewing thread is pulled up by the balance 1 of the sewing machine, a high resistance is generated in the sewing thread, which may cause a failure in pulling up the thread.

On the other hand, in addition to the disadvantages described above, the size of the loop of the sewing thread used for sewing varies depending on the slippery thread, the thread having a large friction resistance, the thread having irregularities, etc. It was not possible to correspond to the sewing thread of.

Further, in this thread guiding tool, it is necessary to carry out a thread hooking operation in which the sewing thread is passed through the thread hole having a small shape once or a plurality of times. These operations are located below the sewing machine head. For thread guide A (see Fig. 5),
The unnatural posture with the back bent greatly complicates the time-consuming work and reduces the work efficiency.

[0017]

A thread guiding tool for a sewing machine according to the present invention has been made to solve the above-mentioned conventional problems. The thread guiding tool for the sewing machine is provided on a needle bar or a sewing needle of the sewing machine. A fixed member that moves up and down together with a sewing needle, a long groove that extends in the vertical direction on the fixed member, and is cut out so as to form a thread winding rod capable of winding a sewing thread by the end of the fixed member; and the long groove. In order to solve the above-mentioned conventional problems, at least one threading hole through which a sewing thread is inserted is provided in the lower part of the above.

[0018]

The thread guide of the sewing machine according to the present invention allows the sewing thread to pass through the longitudinal groove formed in the longitudinal direction of the fixing member that moves up and down together with the sewing needle of the sewing machine and the threading hole provided below the longitudinal groove. To do.

When the sewing thread is set, the elongated hole extending in the longitudinal direction facilitates and quick insertion of the sewing thread.

Then, depending on the kind of the sewing thread, the sewing thread is wound around the thread winding rod or not wound,
When the sewing needle is lowered, the slack and the slack of the thread are suppressed, and when the sewing needle is raised, the thread is pulled up well, and stitches without skipping or thread breakage can be obtained.

[0021]

Embodiments of the present invention will be described with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals, and the duplicated description will be omitted. FIG. 1 is a view showing an embodiment of a thread guide tool for a sewing machine according to the present invention.

In the figure, reference numeral 5 denotes a fixing member integrally formed with a fixing body 3 fixed to the needle bar 2 of the sewing machine. The fixing member 5 has a thin plate shape as shown in the drawing.

Reference numeral 6 denotes a long groove which is vertically cut in the fixing member 5. The long groove 6 is provided in the vicinity of the end of the fixing member 5, and the thread winding rod 7 is formed by the end of the fixing member 5. It is supposed to do.

Numeral 8 is a threading hole. This threading hole 8
Is provided below the slot 6. In the thread guide of the sewing machine shown in the figure, two threading holes 8 are provided.

2 to 4 are explanatory views showing an example of hooking a sewing thread and an operation of the sewing thread in the thread guide of the sewing machine shown in FIG. FIG. 7B is an explanatory view showing the time when the sewing needle is raised.

In FIG. 2, the sewing thread is hung so as to pass through the long groove 6 and the threading hole 8 (only below).

The thread hooking state shown in FIG. 2 is suitable for a sewing thread with a relatively small number of threads, and when the sewing needle N is lowered,
The sewing thread is made slack at the two positions of the long groove 6 and the threading hole 8 so as to eliminate the slack in the thread loop.

In FIG. 3, the sewing thread is hung so as to pass through the long groove 6 and the threading hole 8 (only below), and
It is hung so as to be wound around the spool pin 7.

The thread hooking state shown in FIG. 3 is suitable for a general sewing thread having a slightly large amount of thread irregularity, and when the sewing needle N descends, the sewing thread is provided at three positions, both sides of the long groove 6 and the threading hole 8. The slack is attached to the sewing needle N, especially in the long groove 6 portion away from the sewing needle N, and the thread slack is reduced as the sewing needle N is approached. I can.

In FIG. 4, the sewing thread is hung so as to pass through the long groove 6 and the threading hole 8 (both up and down), and
It is hung so as to be wound around the spool pin 7. The thread hooking state shown in FIG. 4 is suitable for a sewing thread having a sharp thread swell, and a plurality of thread slacks are provided as shown in the drawing, and the thread slack is reduced as the thread approaches the sewing needle N to make the sewing needle. It is possible to make the string violence below N small.

Further, when the sewing needle N is raised in the thread hooking state shown in FIGS. 2 to 4, as shown in FIGS. 2 (b) to 4 (b), the long thread 6 is not greatly bent. Can be brought into a substantially vertical state by contacting both ends in the longitudinal direction of the sewing machine, or the thread winding rod 7 can be spirally wound around the long groove 6 and the sewing thread can be pulled up without causing a large resistance. Etc. will not occur.

The long groove 6 formed in the vertical direction makes the sewing thread hooking operation easy and quick, and the working efficiency can be improved. Further, the thread guide of this sewing machine can be provided at a low cost because the long groove 6 may be formed in the fixing member 5 which largely projects and the manufacturing is relatively easy.

[0033]

As described above, the thread guide of the sewing machine according to the present invention extends the thread guide along a sewing needle in a vertical direction on a fixed member that moves up and down, and winds a sewing thread by the end of the fixed member. Since a long groove cut out so as to form a thread winding rod that can be wound and at least one thread passing hole through which a sewing thread is inserted are provided below the long groove, the thread guide of the sewing machine can be made inexpensive. In addition, the thread hooking operation of the sewing machine on the thread guide is easy and quick, and the work efficiency can be improved. Further, when the sewing needle is lowered, slackening or slackening of the thread is suppressed, and when the sewing needle is raised, the thread is pulled up well, so that a stable loop can be obtained and stitches without skipping or thread breakage can be obtained.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a thread guide tool for a sewing machine according to the present invention.

2A and 2B are explanatory diagrams showing a hooked state of a sewing thread with less thread irregularity in the thread guiding tool of the sewing machine shown in FIG. 1 and an operation at the time of sewing.

3A and 3B are explanatory views showing a hooking state of a sewing thread having a relatively large number of thread irregularities in the thread guiding tool of the sewing machine shown in FIG. 1 and an operation at the time of sewing.

4A and 4B are explanatory diagrams showing a hooking state of a sewing thread with a large number of thread irregularities and an operation at the time of sewing in the thread guiding tool of the sewing machine shown in FIG.

FIG. 5 is an external perspective view showing an installed state of a thread guide tool of the sewing machine.

FIG. 6 is an external perspective view showing a configuration state of a thread guide tool of a conventional sewing machine.

FIG. 7 is an external perspective view showing a configuration state of a thread guide tool of a conventional sewing machine.

FIG. 8 is an external perspective view showing a configuration state of a thread guide tool of a conventional sewing machine.

[Simple explanation of symbols]

 5 Fixing member 6 Long groove 7 Thread winding rod 8 Threading hole

Claims (1)

[Scope of utility model registration request] 1. A thread guide for a sewing machine, which is provided between a balance of a sewing machine and a sewing needle and moves up and down together with the sewing needle. The thread guide is provided on a needle bar or a sewing needle of the sewing machine and moves up and down together with the sewing needle. And a long groove that extends in the longitudinal direction of the fixing member and is cut so as to form a thread winding rod capable of winding the sewing thread with the end of the fixing member, and the sewing thread is inserted below the long groove. A thread guide tool for a sewing machine, comprising at least one threading hole.