JPS6063085A - Presser for 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] The needle threading the upper thread of the sewing machine descends, becomes entangled with the bobbin thread, and rises, and the knot between the upper thread and bobbin thread is tightened by the rising upper thread, but in the meantime, 1. The fabric that has curled downwards is transferred to the rear of the presser foot.

Therefore, between knot 7 and knot ', that is, if the first stitch is short, the distance between one side and the height m is approximately equal to the length 1 of the first stitch, as shown in Figure 6 (a). Scrape off the back side of the presser foot A from the rear side of the needle droplet l in an amount equal to the hypotenuse of the right triangle.

In addition, if the first stitch is long, similarly, as shown in Figure 6 (b), a right triangle with length L and height M /7-1 ki
:nt-1i + / /l+ :L″ffl I
tn Inscription: TI 7th I JIB j 6 Cut the front side of A slightly longer than above.

If you use the presser foot shown in Figure 6 (a) for long stitches, the upper thread will rise and pull the knot with the bobbin thread.
When tightening, the knot goes into the back side of presser foot A, so it cannot be tightened.

In addition, when the presser foot shown in Fig. 6 (b) is used in the case of short stitch 1, when the upper thread rises and tightens the knot υH with the lower thread, the knot river J that reaches the middle of distance #L will move upward. It is pulled up and causes the cloth to shrink.

Conventionally, when the stitches are short, the presser foot shown in Figure 6 (A) is used, and when the stitches are long, the presser foot shown in Figure 6 (A) is used.
Using the presser foot shown in ``1'', when the knot of the lower thread moves near the vertex of the right triangle cross section formed on the front side of presser foot A, tie the knot with the old thread shown in ``1''. I give up.

In this way, in the past, it was necessary to prepare a plurality of different presser feet depending on the length of the seam, which resulted in a large number of parts and was cumbersome.The present invention improves this and makes it possible to The N purpose is to tighten the thread using one example of a presser foot.

The present invention will be described with reference to the embodiment shown in FIGS. 1 to 5. A groove 2 is formed on the back side of the presser foot A following the rear edge of the split hole 1, and a valve plate 3 is fitted into the groove 2. do. In this way, the back side of the presser foot A and the surface of the valve plate 3 become on the same plane.

The front half of the valve plate 3 is formed slightly deeper so that it can move up and down within the groove 2, and an air IIJI 2a is provided between the valve plate and the back side of the presser foot A. The front side of the valve plate 3 rises along the rear edge of the split hole l, and its two wheels are bent rearward, and the bent portion 3a engages with the upper surface of the presser foot A.

Reference numeral 4 denotes a set screw that fixes the bent portion of the rear end of the valve plate 3 that rises by 1" to the presser foot A.

Reference numeral 5 indicates a connecting pin between the holder H and the presser foot A, and 6 indicates a fabric to be machine-sewn on top of the holder H, which is intermittently transferred in the direction of the arrow. Reference numeral 7 denotes a needle plate on which a cloth 6 is placed, and a needle hole 8 is bored in the side plate 7 to communicate with the needle drop hole 1 through the cloth.

In the present invention, the valve plate 3 is attached from the rear edge of the split hole l to the back side of the presser foot A, and a space 2a is formed between the front half of the valve plate 3 and the back side of the presser foot. ), the button through which the upper thread is threaded descends, becomes entangled with the lower thread, and rises, while the fabrics 6.6 stacked one above the other are transferred to the rear of the presser foot A. And the intertwined knot I between the upper thread and lower thread
``a'' can be tightened because the rising upper thread pushes the front of the valve plate 3 upward toward the space 2a by a height m.

In addition, if the seam is long between the knots, that is, if the stitch is long, as shown in Fig. 5, the bobbin thread moving up or the front of the valve plate 3 should be pushed upward by a height M toward the space 2a. , the knot can be tightened.

In this way, according to the present invention, regardless of whether the seam is short or long, the front of the valve plate 3 resists its elasticity and rises lower or higher to tighten the knot a. This has the effect of tightening knots a in various long and short seams using the presser foot.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2 is a perspective view of the back side of the presser foot, Fig. 3 is a vertical side view of the presser foot of the present invention, and Fig. 4 is an exploded perspective view of an embodiment of the present invention. FIG. 5 is a vertical side view showing the effect of the present invention on the padding seam, and FIG.
The figure shows a conventional presser foot, where A is used for short seams and the opening is a partially longitudinal side view of the presser foot used for long seams. A is the presser foot, ■ is the needle hole, 2 is the concave groove, 3 is the valve plate, and 4 is the set screw. Agent Tetsube Maki (and 2 others)

Claims (1)

[Claims] A presser foot for a sewing machine, in which a valve plate is attached from the rear edge of the needle hole to the back side of the presser foot A, and a space is formed between the front half of the valve plate and the back side of the presser foot.