JPS63209694A - Decorative yarn delivery mechanism of decorative stitch sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a decorative thread reeling mechanism for a decorative stitch sewing machine.
More specifically, in a decorative thread reeling mechanism that pays out and secures the amount of decorative thread required by the spreader when sewing a decorative kimono with a decorative stitch sewing machine, the thread reeling mechanism adjusts the thread reeling according to variable factors such as the quality of the decorative thread. This invention relates to a decorative thread reeling mechanism that has been improved so that even if the position of the decorative thread guide is adjusted to appropriately change the amount, the decorative thread guide and the decorative thread reel will not come into contact with each other.

BACKGROUND OF THE INVENTION Decorative stitching is known as a special sewing technique in the prior art, particularly by industrial sewing machines, and decorative stitching machines are suitably used for this purpose. This decorative stitch is a seam formed by passing the decorative thread between two or three upper threads using a spreader on the upper side of the workpiece fabric, and the bobbin thread using a looper on the lower side. For example, it is often used to tape the neck, cuffs, and hem of underwear.

In this decorative stitch sewing machine, when the decorative thread is passed between the above-mentioned plural needle threads using a spreader, it is necessary to feed out the required amount of decorative thread to the spreader, and the purpose of this is to A decorative thread reeling mechanism is provided for this purpose. - As shown by way of example in FIGS. 4 and 5, a corresponding number of needle threads 16 are placed on the upper arm 12 of the decorative stitch sewing machine 10 for two or three sewing needles 14;
An upper thread reel 18 that lets out the thread is pivotably supported around a pivot 20. A decorative thread reel 26 is fixed to the upper thread reel 18 for feeding out the decorative thread 24 toward a spreader 22 shown in FIG. 1, so that the upper thread reel 18 can swing together with the upper thread reel 18.

Further, the upper arm 12 is located near the pivot shaft 20, which is a common pivot point for the upper thread reel 18 and the decorative thread reel 26 described above.
A decorative thread guide 28 having a pair of two membrane-like opposing pieces 28a, 28a formed at its tips is rotatably fixed by an adjusting screw 30.

The decorative thread reel 26 faces between the facing pieces 28a, 28a of the decorative thread guide 28, and can swing together with the upper thread reel 18. When the decorative thread reel 26 swings downward, the spreader The amount of decorative thread 24 required for thread 22 can be fed out.

Problems to be Solved by the Invention As mentioned above, in the decorative thread reeling mechanism configured to pay out the decorative thread 24 by the amount of thread required by the spreader 22, the needle width of the sewing needle 14 may be changed or When using decorative thread, it is necessary to change the amount of thread fed to the spreader 22 as appropriate. In order to meet this request, the adjustment screw 30 is loosened and the decorative thread guide 28 is rotated to adjust the position of the opposing pieces 28a, 28a with respect to the arcuate locus drawn by the tip of the decorative thread reel 26. The thread reeling amount can be changed.

However, the pivot 20, which is the center of swing of the decorative thread reel 26,
It is positioned apart from the adjustment screw 30 which is the adjustment reference point of the decorative thread guide 28. Therefore, when the decorative thread guide 28 is rotated to adjust its position in order to change the thread reeling amount, depending on the extent of the rotation, the tip of the decorative thread reel 26 may be located between the opposing pieces 28a, 28a during the swinging. It becomes impossible to pass through.

As shown in FIG. 6, there was a drawback that interference contact occurred. Furthermore, in order to rotate the decorative thread guide 28, it is necessary to adjust other members in addition to the adjustment screw 30, so that the adjustment work is complicated.

OBJECTS OF THE INVENTION The present invention has been proposed in order to suitably solve the above-mentioned disadvantages inherent in the decorative thread reeling mechanism of the decorative stitch sewing machine. In the decorative thread reeling mechanism, when the position of the decorative thread guide is rotated and adjusted to change the thread reeling leaf appropriately, the decorative thread reel is always located between the two opposing pieces of the decorative thread guide,
It is an object of the present invention to provide an improved decorative thread reeling mechanism in which the two do not come into contact with each other and can be easily adjusted.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the desired objectives, the present invention provides a needle threader which is swingably supported on the upper arm and which feeds the needle thread toward the sewing needle. , a decorative thread guide provided to be able to swing integrally with the upper thread reel and for paying out the decorative thread toward the spreader, and a decorative thread guide fixed to the upper arm so as to be rotationally adjustable; Thread reeling is done by swinging between a pair of opposing pieces formed on the decorative thread guide.

The decorative stitch sewing machine is configured to be able to pay out a required amount of decorative thread to the spreader, and the decorative thread guide is configured to have a rotation center coincident with a pivot point of the decorative thread reel. Special Embodiments Featured Next, the decorative thread reeling mechanism of the decorative stitch sewing machine according to the present invention will be described below with reference to the accompanying drawings, using preferred embodiments. The basic configuration of the decorative thread reeling mechanism is the same as that described with reference to FIGS. 4 and 5, so the same members will be designated by the same reference numerals.

As shown in FIGS. 1 and 2, the upper arm 1 of the sewing machine
A thread take-up lever 32 having the shape shown in the figure is fixed to a pivot shaft 20 rotatably provided on the shaft 20, and the needle thread take-up 18 and the decorative thread take-up 26 are attached to the thread take-up lever 32 by bolts 34 and 34.
The levers 32 and 32 are commonly fixed together so that both members can integrally perform the required rocking motion together with the lever 32. At the tip of this decorative thread reel 26, there is an operating piece 26a facing between surface facing pieces 28a, 28a of a decorative thread guide 28, which will be described later.
are integrally formed. Further, the shape of the actuating piece 26a is dimensioned to have a degree of curvature that matches the arc drawn when the decorative thread reel 26 swings about the pivot shaft 20.

At the location where the pivot shaft 20 is disposed in the upper arm 12, there is a third
As shown in the figure, a circular boss 36 with a required diameter and whose center coincides with the pivot 20 is provided in a protruding manner.

A circular opening 2 is bored at the base of the decorative thread guide 28.
8b into this boss 36, the decorative thread guide 28 can rotate independently of the decorative thread reel 26 with its pivot point aligned with the pivot center of the decorative thread reel 26. freely supported. This decorative thread guide 2
8 is provided with a concentric arc-shaped through hole 38 centered on the pivot shaft 20, as shown in FIG. It can be fixed at any desired position.

Also, a pair of opposing pieces 28 formed at the tip of the decorative thread guide 28
The dimension L1 between the midpoint of 28a and the center of rotation of the ornamental thread guide 28 is set in advance to match the radial dimension D0 of the curved actuating piece 26a of the ornamental thread reel 26 about the axis 20. It is.

Therefore, the actuating piece 26a of the decorative thread reel 26 is the face-facing piece 28a of the decorative thread guide 28, as shown in FIG.

It faces the middle position of 28a.

According to the decorative thread reeling mechanism according to the present embodiment configured as described above, when it is necessary to change the thread payout amount appropriately depending on the degree of expansion and contraction of the decorative thread 24, the needle width of the sewing needle 14, etc., the decorative thread guide 28 Loosen the bolt 40 and rotate the decorative thread guide 28 to adjust the relative position of the decorative thread reel 26 with respect to the operating piece 26a.

All you have to do is tighten the bolt 40 again.

At this time, as described above, since the center of rotation of the decorative thread guide 28 coincides with the center of swing of the decorative thread reel 26, the decorative thread guide 28 is adjusted to rotate along the arc locus drawn by the actuating piece 26a. Therefore, when the actuating piece 26a swings, it always passes between the surface-facing pieces 28a, 28a, and there is no contact interference between the two pieces.

Effects of the Invention As described above, in the decorative thread reeling mechanism of the decorative stitch sewing machine according to the present invention, the center of rotation of the decorative thread guide constituting the decorative thread reeling mechanism is made to coincide with the center of oscillation of the decorative thread reel, so that the decorative thread reel does not oscillate. When moving, the tip always passes through the middle of the surface facing piece of the ornamental thread guide, which has the advantage that the two members do not come into contact with each other and can smoothly adjust the thread payout amount. Also, to adjust the rotation of the decorative thread guide,
Loosening and tightening a single bolt only requires operation.
This simplifies and speeds up work.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the general overall configuration of a decorative thread reeling mechanism according to a preferred embodiment of the present invention, FIG. 2 is a front view of the decorative thread reeling mechanism shown in FIG. 1, and FIG. FIG. 4 is a schematic perspective view of a decorative stitch sewing machine equipped with a decorative thread reeling mechanism according to the prior art, and FIG.
FIG. 6 is a front view of the decorative thread reeling mechanism shown in the figure, and FIG. 6 is a front view showing a state in which the decorative thread reeling mechanism contacts and interferes with the decorative thread guide in the decorative thread reeling mechanism shown in FIG. 12... Upper arm 14... Sewing needle 16... Upper thread 18... Needle thread reel 22... Spreader 24... Decorative thread 26... Decorative thread reel 26a.
... Actuating piece 28... Decorative thread guide 28a... Opposing piece Patent applicant Brother Industries, Ltd. Applicant's agent Patent attorney Yoshiki Sanmizu: , (. \, -゛・Tsuba FIG, 1 FIG, 3, / Ichiriki 1- FIG, 4 Sho FIG, 5 FIG, 6

Claims (1)

[Scope of Claims] [1] A needle thread take-up (18) that is pivotably supported on the upper arm (12) and feeds out the needle thread (16) toward the sewing needle (14).
), and is provided so as to be able to swing together with the upper thread reel (18), and the decorative thread (24) is moved toward the spreader (22).
and a decorative thread guide (28) rotatably fixed to the upper arm (12).
The decorative stitch is configured to be able to pay out the required amount of decorative thread (24) to the spreader (22) by swinging between a pair of opposing pieces (28a, 28a) formed on the spreader (22). A decorative thread reeling mechanism for a decorative stitch sewing machine, characterized in that the center of rotation of the decorative thread guide (28) is configured to coincide with a swing pivot point of the decorative thread reel (26). [2] An actuation piece (26a) is formed at the tip of the decorative thread reel (26), and the actuation piece (26a) has a curved shape that corresponds to an arc drawn around the pivot point.
26a) is configured to swing between the pair of opposing pieces (28a, 28a) formed on the decorative thread guide (28). .