JPH0534636Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a needle thread receiver storage device for a sewing machine. Improved needle thread receiver that is auxiliary and installed in parallel with the thread take-up thread so that a sufficiently large loop is secured below, the loop is captured securely by the stitch forming device, and skipped stitches due to miscapture can be prevented. It is related to.

Prior Art For example, double chain stitch sewing machines are suitably used for special industrial sewing applications. This double chainstitch sewing machine basically lowers one or more sewing threads through which the needle thread is inserted and pierces the fabric to be processed.
Next, in the process of raising the sewing needle, a looper with a looper thread is passed through a loop formed below the work cloth, thereby sequentially forming circular stitches.

An example of this double chainstitch sewing machine is shown in FIG.
In the illustrated sewing machine, a thread take-up 14 that is driven vertically and reciprocally by a main shaft (not shown) is disposed on a sewing machine head 12 located at the tip of an upper arm 10, and thread is fed from a plurality of thread supply sources to this thread take-up. A needle thread 16 is inserted through the eye of one or more sewing needles 20 fixed to the lower end of the needle bar 18. During sewing, the sewing needle 20 descends and pierces the work cloth 24 on the throat plate 22, and then, in the process of rising, a loop 16 is formed on the back side of the work cloth as shown in FIG. 8b.
A looper 28 with a looper thread 26 enters at point a to perform chain stitching. During this sewing, the needle thread 1 inserted into each sewing needle 20 is
It functions to ensure that the required amount of yarn is extra for 6.

Problems to be Solved by the Invention When chain stitching is performed using the double chain stitch sewing machine exemplified above, needle threads with various properties are used depending on the properties of the object to be sewn. For example, when sewing lace rubber to an elastic part of shorts or the like, a needle thread with a high degree of elasticity, such as synthetic thread, is used. When synthetic yarn with high elongation is used as needle thread, as shown in Figure 8a,
This affects the size of the loop 16a formed below the work cloth 24 by piercing the sewing needle 20. That is, in the case of a needle thread 16 with a large elongation, the loop 16a formed by the rising of the sewing needle 20 stretches against the elasticity of the needle thread 16, so the loop 16a immediately contracts and becomes smaller. If the loop 16a is small in this way, the looper 28 cannot capture it, which causes so-called skipped stitches.

Therefore, as a countermeasure when using needle thread 16 with a large elongation, as shown in FIGS. 4 and 6,
A needle thread receiver 3 in which a wire is bent into a W ₂ shape is located close to the placement position of the thread take-up lever 14 in the sewing machine head 12.
A configuration is adopted in which two needle threads 0 are provided and the needle thread 16 is hooked to the needle thread receiver 30 in parallel with the thread take-up 14, thereby increasing the amount of needle thread 16 secured by the thread take-up 14. has been done. As described above, this needle thread receiver 30 is used only when the needle thread 16 is stretched to a large extent, and is not used during normal sewing and is placed in a standby state.

Therefore, the conventional needle thread receiver 30 is
The lower end 30a of the needle thread receiver 30 is inserted into a holding hole 32 vertically drilled at a predetermined position, and is fixed by a set screw 34 inserted horizontally into the sewing machine head 12. and needle thread receiver 3
When the needle thread receiver 30 is not used, the needle thread receiver 30 is rotated 180° relative to the thread take-up lever 14 and positioned at the rear, as shown in FIG. In addition, when using the set screw 3
4 is loosened and horizontally turned toward the front side, and after being positioned parallel to the balance 14 as shown in FIG. 6, the set screw 34 is tightened and fixed again. In this way, the needle thread receiver 30 is used depending on the properties of the needle thread 16, and when it is not normally used, it is rotated 180° with respect to the thread take-up lever 14 above the sewing machine head 12, as described above and shown in FIG. However, in this state, it gets in the way when rotating the presser foot adjustment screw 36, and also has the disadvantage that it spoils the external appearance.

Further, as shown in FIG. 7, when not in use, loosen the setscrew 34 and attach the needle thread receiver 30 to the sewing machine head 12.
There have also been proposals to remove it completely.
However, in this case, it is troublesome to always store the removed needle thread receiver 30 in a predetermined location, and there is also a risk that it will be lost the next time it is used, which is not preferable in terms of handling.

Purpose of the invention The present invention was proposed in order to suitably solve the drawbacks inherent in the needle thread receiver of the double chainstitch sewing machine cited as an example. When the sewing machine is not in use, it is stored in the recess in the sewing machine head, and only protrudes outside the machine frame when it is in use, giving it a streamlined appearance and allowing the needle thread to be accessed when necessary. The purpose is to eliminate the inconvenience of not being able to find a receiver.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the intended purpose, the present invention provides a seam forming device including a sewing needle through which needle thread is inserted, a seam forming device for forming a seam, and a sewing machine head. A thread take-up is provided on the sewing machine head to ensure the required amount of thread for the needle thread, and a needle thread take-up is provided on the head of the sewing machine in close proximity to the thread take-up to provide an auxiliary needle thread in addition to the thread take-up when using needle thread with a large elongation. In a sewing machine equipped with a needle thread receiver that secures the amount of thread required for stitch formation by threading, a recess is formed in the sewing machine head, and the needle thread receiver is inserted from the recess to the outside of the machine frame. The needle thread receiver is provided so as to be retractable into the recess, and when the needle thread receiver is in use, the needle thread receiver can be projected from the recessed portion, and when the needle thread receiver is not in use, the needle thread receiver can be stored in the recessed portion. Features.

Embodiments Next, a preferred embodiment of the needle thread receiver storage device for a sewing machine according to the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 3, the basic configuration in which two needle thread receivers 30, 30 are disposed close to the location of the thread take-up lever 14 in the sewing machine head 12 is shown in FIG. The structure is similar to the conventional structure shown in FIG.

In the present invention, a recessed portion 38 is formed in contact with the area where the thread take-up lever 14 is disposed in the sewing machine head 12, and two needle thread receivers 30,
30 is erected so as to be horizontally pivotable. That is, the recessed portion 38 is an elongated stepped groove formed on the top surface of the sewing machine head 12 so as to be located slightly in front of the position where the top portion 18a of the needle bar 18 protrudes. As shown in FIG. 1a, 38 is open at the front side of the upper part of the sewing machine head 12. Further, the dimensions of the recessed portion 38 in the front-back and left-right directions in the planar state shown in FIG. 3 are set to such a size that the needle thread receivers 30, 30, which will be described later, can be stored with their warp when not in use. A thread take-up 14 connected to the top portion 18a of the needle bar is located above the recessed portion 38 and extends horizontally.

In addition, the double needle thread receivers 30, 30 can hold wires of the required diameter.
In the holding holes 32, 32, which are made of a member bent into a _W2 shape, and which are bored perpendicularly to the recessed part 38,
The lower end portion 30a of the needle thread receiver 30 is inserted through the needle thread receiver 30 so as to be rotatable and movable up and down. Furthermore, sewing machine head 1
A screw storage hole 42 is horizontally drilled at a predetermined position on the front side surface of the needle thread receiver 30 , and a set screw 34 facing into the screw storage hole 42 is used to secure the needle thread receiver 30 .
The lower end portion 30a of is adapted to be fixed in a manner that allows it to be tightened and loosened. Note that the holding holes 32, 32, through which the double needle thread receivers 30, 30 are inserted and held, are formed at the third
As shown in the plan view of the figure, the positions are set on both sides of the balance 14 extending directly above the recessed portion 38 so as to be slightly displaced back and forth.

Next, the actual use of the needle and thread receiving box device for a sewing machine according to the present invention constructed as described above will be explained. As mentioned above, the double needle thread receivers 30, 30 are connected to the vertical holding holes 32, 32 formed in the recessed portion 38.
It is inserted inside and can be rotated and raised and lowered. In the normal non-use state, as shown in Fig. 2a and b, the two needle thread receivers 30 and 3
0 are lowered to the maximum extent through the holding holes 32, 32, and are housed side by side in the recessed portion 38.

However, when using a needle thread 16 with a high elongation such as a synthetic thread, loosen the setscrew 34 and move each needle thread receiver 30 approximately toward the front side as shown in FIG.
It is turned horizontally by 90 degrees and extends parallel to both sides with the balance 14 in between. Next, the needle thread receiver 30 is raised by a required distance to adjust its height relative to the thread take-up 14, and after setting it at the required position, it is again tightened and fixed with the setscrew 34. After use, the needle thread receivers 30, 30 are housed in the recessed portion 38 by following the reverse procedure.

In addition, in this explanation, two needle thread receivers 30, 30
In both cases, the needle thread receiver 30 is extended toward the front side from the recessed portion 38 during use, but if the degree of elongation of the needle thread 16 is small, one needle
Alternatively, only the needle thread 16 may be extended, and the needle thread 16 may be threaded only on this part.

In the illustrated example, the needle thread receiver is rotated horizontally to extend toward the front side, but the needle thread receiver may also be moved up and down in the axial direction, or foldable so that it can be moved into and out of the recessed portion. The present invention also contemplates that it may be possible to do so.

Effects of the Invention As explained above, according to the needle and thread receiver storage device according to the present invention, there is no need to use a needle thread receiver when using ordinary needle thread. Store it in the recess at the position shown in . Therefore, it does not get in the way when operating the sewing machine, and a clean and aesthetically pleasing appearance can be obtained. In addition, when using a needle thread with a high elongation such as a synthetic thread, as shown in Figure 1, the needle thread receiver should be turned 90 degrees horizontally from the recessed part and extended toward the front side, and the required height should be By fixing the sewing needle in the raised state, it is possible to secure the amount of needle thread necessary for the sewing needle. Furthermore, since the needle thread receiver is not removed when not in use, there is no risk of the needle thread receiver being lost during the next use.

[Brief explanation of the drawing]

Fig. 1a is a perspective view of a main part showing a preferred embodiment of the needle thread receiver storage device for a sewing machine according to the present invention, Fig. 1b is a front view of the main part, and Fig. 2a is a
In the embodiment shown in the figure, a perspective view of the main part of the needle thread receiver shown in a state where it is housed in the recessed part, FIG. 2b is a front view of the main part, and FIG. 3 is a main part of the needle thread receiver shown in FIG. FIG. 4 is a perspective view showing a schematic configuration of a double chainstitch sewing machine according to the prior art, FIG.
FIG. 6 is a perspective view of the main part of the needle thread receiver corresponding to FIG. 5 in a state in which it is used, FIG. 7 is a side view showing a prior art needle thread receiver according to yet another embodiment, and FIG. Figures a and 8b are schematic explanatory diagrams showing a state in which a loop is formed in the needle thread. 12... Sewing machine head, 14... Balance, 16...
Needle thread, 16a...Loop, 20...Sewing needle, 26...
... Looper thread, 28 ... Looper, 30 ... Needle thread receiver, 34 ... Set screw, 38 ... Recessed portion.

Claims (1)

[Scope of Claim for Utility Model Registration] [1] A stitch forming device that includes a sewing needle 20 through which a needle thread 16 is inserted and forms stitches, and a sewing machine head 12
A thread take-up 14 is provided on the sewing machine head 12 to ensure the required amount of thread for the needle thread 16;
Needle thread 16 which is arranged close to 4 and has a large elongation.
In addition to the thread take-up lever 14, the sewing machine is equipped with a needle thread receiver 30, 30 for supplementary needle threading to ensure the amount of thread necessary for stitch formation, in which the sewing machine head 12 is provided with: A recessed portion 38 is formed, and the needle thread receiver 3 is inserted from this recessed portion 38.
0 and 30 are provided so as to be able to protrude and retract from the outside of the machine frame, and when the needle thread receivers 30 and 30 are used, the needle thread receivers 3
0 and 30 protrude from the recessed part 38, and the needle thread receivers 30 and 30 are configured to be housed in the recessed part 38 when the needle thread receivers 30 and 30 are not in use. Thread receiver storage device. [2] The needle thread receivers 30, 30 are connected to the recessed portion 38.
It is vertically installed so that it can be raised and lowered freely, and its height can be adjusted relative to the balance 14, and after it is set at the desired position, it is tightened and fixed with a set screw 34. A needle thread receiver storage device for a sewing machine according to claim 1 of the patent registration claim.