JPS62114591A - Decorative needle thread looper 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 reciprocates the front side of sewing machine needles arranged in parallel in the horizontal direction to hook decorative thread extending from the seam forming area and feed it out in a direction crossing the sewing direction. The present invention relates to a looper for a top cover thread of a top stitch sewing machine that sews onto the upper surface of a cloth using needle thread to form interlock stitches.

PRIOR ART This type of top thread looper is usually composed of an arc-shaped piece that makes a reciprocating circular arc movement from side to side with the hand i'6i of the sewing machine needle around a vertical axis supported parallel to the needle bar. There was a hook attached to the sewing machine, and when the looper moved forward when the sewing machine was driven, the decorative thread extending diagonally upward to the right from the seam forming area was caught with the hook and pulled to the left until it reached the left end. In the case of a two-needle sewing machine, the needle moves inside the loop of the decorative thread that is caught on the hook and is bent, and the right needle descends on the front side of the loop, and when the looper moves back, the decorative thread is released from the hook. The released decorative thread is pushed down by the right needle thread so that it can be sewn onto the fabric. As mentioned above, the louver for the decorative thread needs to have the function of hooking and pulling the decorative thread, as well as allowing the hooked decorative thread to be released smoothly when necessary. The seed looper is equipped with a hook as described above, but if the decorative thread is thick or loose due to loose thread, it will not engage the hook properly and the hook will be damaged, and the presser foot may be damaged. When the stitch or needle bar rises and the decorative thread moves backward or becomes loose, it comes off the hook, causing skipped stitches and the problem of not being able to obtain beautiful decorative stitches. To solve this problem, Japanese Patent Publication No. 54-9112 proposes that the hook be inserted from the inside of the arc.
In other words, it has been proposed to protrude toward the needle side and provide a cut groove in the horizontal direction between the looper and the main body, but even this was not sufficient to solve the above-mentioned problems. .

Problems to be Solved by the Invention It is an object of the present invention to solve the above-mentioned problems and to provide a looper for top stitching of a decorative stitch sewing machine that can produce beautiful decorative stitches without skipped stitches.

A means for solving the problem, that is, the present invention, involves reciprocating the front side of the sewing machine needle, hooking the decorative thread extending from the seam forming area, feeding it out in a direction crossing the sewing direction, and sewing it onto the upper surface of the fabric with the needle thread. In a top decorative complement corner louver of a decorative stitch sewing machine that forms interlock stitches by using a louver, a folded piece is provided at an appropriate position on the upper surface of the louver body and extends toward the base end of the looper with an appropriate gap between the body and the free end of the folded piece. The louver is further characterized in that a hook is formed which is folded downward and toward the tip of the louver body.

Here, the folded piece may be bent, for example, in an inverted shape, rising from a proper position of the louver body and extending parallel to the body, or extending at an angle from the louver body, or formed in an arch shape. .

Further, the direction in which the hook faces does not necessarily have to be aligned with the tip of the louver body, but may be directed slightly toward the needle bar side, for example.

An interlock stitch sewing machine with two to four needles is usually used as a decorative stitch sewing machine.

The figure shows an example in which the looper for top stitching according to the present invention is installed in a two-needle interlock stitch sewing machine. fixed,
The thread passes through a thread hole 3 in a thread guide 2 that moves up and down with the needle bar 1, passes through a long hole 5 in a decorative thread guide 4 supported by a sewing machine arm, and reaches the bottom of a presser foot 6. Louper 7 for top-dressed rice
is attached to a holder 9 fixed to the vertical shaft 8, and its lower part is bent horizontally so that the front side of the needle bar is curved in an arc toward the needle bar side, and the needle moves in conjunction with the vertical movement of the needle bar 1. 10. It is designed to make a reciprocating circular arc movement on the near side of 11. A folding piece 12, which is formed by bending a wire, is protrudingly provided at a suitable position on the upper surface (the figure shows an example where it is provided near the tip, but it may be provided at a position away from the tip). As shown in FIG. 1, the piece 12 has a rising portion a that rises from the louver main body, and an intermediate portion that extends rearward with an appropriate distance from the louver main body, and a free end thereof that extends downward and downward from the louver main body. and a hook portion C bent toward the tip of the louver, so that the decorative thread T can freely enter and exit the approximately C-shaped space surrounded by these through the gap between the hook tip and the louver body. The decorative thread T introduced into the space is prevented from coming off upward by the intermediate portion or the hook portion C.

Operation Next, the process of letting out the top thread using the wooden louver will be explained based on FIGS. 2 to 5.

When looper 7 moves back to the right, presser foot 6 near the right dead center
Top decorative thread T extending diagonally between the bottom and the front position of the long hole 5
The outside of the hook part a of the folding piece 12 engages with the thread and pushes it in the same direction, and while reaching the right dead center, the top thread T is pushed down by the outside of the hook part (Fig. 2), and after reaching the tip. Beyond this,
When it enters the upper side of the space surrounded by the folding piece 12 and the louver body (Fig. 3), and moves forward to the left, the top thread T introduced into the upper side of the space as described above is hooked. It is hooked at part C and pulled to the left, and when the folded piece 12 crosses the point 10 and the looper 7 reaches the left dead center, the top thread T extending from the presser foot is hooked at hook part C (in the shape of A bent loop is formed.At this time, the thread guide 2 is located above together with the needle bar, and the top thread T is returned to the rear side of the elongated hole 5. l
O falls into the loop, and the right needle 11 falls outside the loop on the front side (Fig. 4). As the looper 7 moves back to the right, it is pushed down by the loose right needle thread N, and the hook part It comes off downward from C (Figure 5) and is sewn onto the fabric of the presser foot with needle thread.

Prior to this, the thread path 2 descends with the needle 10.11.
As a result, the upper decorative thread T is pushed out toward the front side, and the slack of the loop is absorbed while passing through the needle 10. Thereafter, the above-described operation is repeated.

As described above, in this looper 7, the top thread T enters the upper part of the space, so it is reliably caught on the hook part during the return movement.
Even if the upper decorative thread T is slightly loosened or the route is misaligned, the hook will not be damaged or the thread will not come off. Furthermore, even if the top thread T moves away from the rear helper in the elongated hole by raising the presser foot 6 while the top thread T has entered the space, the folding piece 12 The middle part is regulated by the hook part C, so it will not come off upwards.

Furthermore, when the looper 7 moves back to the right from the state shown in FIG. T can be smoothly removed from the looper without being hindered by the hook portion C.

Effects of the Invention As described above, according to the top thread looper of the present invention, the top thread can be reliably hooked by the hook part of the folded piece during forward movement, and moreover, it is caught on the hook part and attached to the core part. The engaged decorative thread does not come off even if the thread loosens or moves upward until it is pushed down by the needle thread, so that beautiful decorative stitches without skipped stitches can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view showing the function of its main parts, and FIGS. 2 to 5 are perspective views similarly showing the function. 1. Needle bar 2. Thread guide 4. Decorative thread guide 6.
Presser foot 7... Louver for top thread 8... Vertical axis 10
．． 11... Needle 12... Folded piece a... Rising part
b...Middle part C...Hook part T...Top thread NINZ...Needle thread Applicant Pegasus Sewing Machine Manufacturing Co., Ltd. Agent Patent Attorney Akira Sa Ue - Figure 1 Figure 4 ζsu 5 Procedural Ordinance Ichimasa (Spontaneous) December 17, 1985 Michibe Uga, Commissioner of the Patent Office 1. Indication of the case 1985 Patent Application No. 256451 2. Title of the invention Looper 3 for top stitching thread of a top stitch sewing machine Make amendments Relation to the patent case Pegasus Sewing Machine Manufacturing Co., Ltd. 5-7-2 Kaesu, Fukushima-ku, Osaka 553 Contents of the amendment Correct it as "C". 2. On the 7th page, line 2, "loose" is changed to "loose top thread T".

Claims (1)

[Claims] A decorative stitch sewing machine that reciprocates the front of the sewing machine's needle to hook the decorative thread extending from the seam forming area and feed it in a direction that intersects the sewing direction, and sews this onto the upper surface of the fabric using the needle thread to form an interlock stitch. In the looper for upper decorative thread, a folded piece 12 is provided at a suitable position on the upper surface of the looper body 7 and extends toward the base end of the looper with an appropriate gap between the folded piece 12 and the looper body. A looper for top thread that forms a hook c that is folded back toward the tip of the thread.