JP2001190882A - Throat plate for interlock sewing machine of two/three needle type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensuring a good sewing with a simple style even in the case of an extremely soft type of a sewn product. SOLUTION: A thread guide slit 5 is covered with an edge stepped portion 6 on the side of throat plate except a thread passing gap 7 opened toward a lower side of a stitch tongue piece 3, viewed from the needle introduction direction. Advantageously, the portion 6 forming a sewn product support portion 9 on the side of upper surface has a ride-on slant surface 11 at a connection area of the slit 5 to a needle introduction hole 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a needle plate for a two-needle or three-needle interlock sewing machine for forming a chain stitch seam from three or four yarns. Alternatively, there are provided three needle introduction holes, and one stitch tongue piece each extending forward by forming a yarn guide slit along the longitudinal direction as viewed in the feeding direction from the two needle introduction holes as a starting point. Regarding the format.

[0002]

2. Description of the Related Art A stitch type 406 based on DIN 61400, for example, using the interlock sewing machine described above.
And 407 can be formed from three or four yarns. In this case, two or three upper threads on the upper side and one lower thread on the lower side are chained to form a chain stitch seam. This chain stitch seam
In particular, it is used for hem stitching and edge stitching of sewn products.
During sewing, a sewing needle is inserted through the needle introduction hole of the needle plate, the upper thread is guided as a loop through the sewing product, and then, through this loop, a loop of the lower thread is formed below the needle plate. Guided, whereby a chain is formed. This chain is pulled against the sewing product. The formed thread loop wraps around the stitch tongue and is removed from the stitch tongue during the sewing product feed. In this case, a loop can be formed and the loop can be slid off the stitch tongue by the thread guide slit between the stitch tongue and the actual needle plate. During sewing, the thread tension causes the loop to contract during sliding down from the stitch tongue, so that, in the case of soft materials in particular, the material area located above the thread guide slit is drawn into the thread guide slit or Since the folded edge seam and the like may be peeled off, such warpage or peeling of the sewn product portion may hinder seam formation.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved needle plate of the type mentioned at the outset, which can be sewn in a very simple manner, even in the case of extremely soft sewn products. To provide.

[0004]

In order to solve this problem, according to the structure of the present invention, the yarn guide slit, as viewed in the needle introduction direction, excludes a yarn passage gap that opens toward the lower side of the stitch tongue. , Is covered by the edge step on the needle plate side,
Advantageously, the edge step forming the sewn product support on the upper side has a raised slope in the area of connection of the thread guide slit to the needle introduction hole.

[0005]

According to the above construction, the edge step has a thread guide slit sufficiently closed when viewed in the needle introduction direction and has a sewn product supporting portion formed on the upper surface thereof. Seam formation is not hindered by folding, warping or edge peeling of the sewn product, supported by the downward pulling forces that occur during sewing. The remaining needle passage gap serves as the necessary space for removing the thread loop from the stitch tongue, which ensures a trouble-free and accurate sewing process. In order to allow the sewing product to slide along the edge step without any trouble, especially at the start of sewing, the edge step has a suitable climbing slope in the connection area of the thread guide slit to the needle introduction hole. . This prevents the sewing product from being caught on the edge step.

[0006] Advantageously, the edge plate is pre-manufactured as a unique step insert and can be inserted into the thread guide slit from below, so that the needle plate can be manufactured relatively easily. It is also possible to equip the needle plate with a corresponding edge later.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

A needle plate 1 for a two-needle interlock sewing machine (not shown in detail) for forming a chain stitch seam has two needle introduction holes 2 and a starting point between the needle introduction holes 2. And a stitch tongue 3 extending forward as viewed in the feed direction V. In this case, the stitch tongue 3 is manufactured as a unique insert and is inserted into the cutout 4 of the needle plate 1, so that a thread guide slit 5 is formed along the longitudinal direction of the stitch tongue 3.

The thread guide slit 5, viewed in the needle introduction direction, is covered by a needle plate-side edge step 6, except for a thread passage gap 7, which opens towards the underside of the stitch tongue. The edge step 6 is manufactured in advance as a unique step-shaped insert 8 and is fitted into the thread guide slit 5 from below.
The upper side of the edge step 6 forms a sewn product support 9.
The sewn product support portion 9 is shifted to a rising slope 11 at a connection area 10 of the thread guide slit 5 to the needle introduction hole 2.

Due to the simple construction of the step 6, a support is formed in the area of the thread guide slit 5 for the sewing product to be sewn, as schematically shown in FIG. , Which prevents a particularly soft sewing product from being drawn into the thread guide slit 5. When sewing with two needles N, the upper two upper threads F and the lower one lower thread G are chained to form a chain stitch seam. In this case, since the chain portion is pulled toward the sewing product, a downward pulling force acts on the sewing product. However, the edge step 6 prevents significant warping and edge peeling, and a satisfactory chain stitch seam is sewn or formed.

[Brief description of the drawings]

FIG. 1 is a plan view of a needle plate according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a longitudinal sectional view taken along line III-III in FIG.

FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is an enlarged cross-sectional view taken along the line VV of FIG. 1;

[Explanation of symbols]

1 Needle plate, 2 Needle introduction hole, 3 Stitch tongue, 4
Notch, 5 thread guide slit, 6 edge step, 7
Thread passing gap, 8 stepped insert, 9 sewing product support, 10 connection area, 11 climbing slope, F upper thread, G lower thread, N needle, V feed direction

Claims (2)

[Claims] 1. A needle plate (1) for a two-needle or three-needle interlock sewing machine for forming a chain stitch seam from three or four yarns, comprising two or three needles. A thread guide slit (5) is formed along the longitudinal direction as viewed in the feed direction (V) from the needle introduction hole (2) and the two needle introduction holes (2) as starting points, and each extends one forward. In the type provided with a stitch tongue (3), the thread guide slit (5) viewed in the needle introduction direction has a thread passing gap (7) that opens toward the lower side of the stitch tongue (3). ) Except for the needle plate side edge step (6), which advantageously forms a sewn product support (9) on the top side. In the connection area (10) of the yarn guide slit (5) to 2), there is a climbing slope (11). And wherein, two-needle type or three hands type needle plate for interlock sewing machine. 2. The step insert (8) having a unique edge step (6).
The needle plate according to claim 1, wherein the needle plate is manufactured in advance and can be inserted into the thread guide slit (5) from below.