JPS63139594A - 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] [Field of Industrial Application] The present invention relates to a presser foot for a sewing machine, and particularly to one provided with an auxiliary presser foot that reliably presses the fabric around the needle drop point when sewing stepped sections of fabric. .

[Prior Art] Conventional presser feet for sewing machines are designed to prevent flapping of the fabric by making the needle holes of the needle plate and presser foot as small as possible in order to prevent skipped stitches at the stepped portions of the fabric.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, when sewing a stepped portion of cloth, the first half of the foot of the presser foot is on the stepped portion of the cloth, and the rear half is on the stepped portion of the cloth. When the foot of the presser foot is on the flat part, the middle part of the foot of the presser foot is away from the fabric and does not press the fabric, so when the needle holding the upper thread rises, the small part of the needle flaps and the thread reaches the specified size. Since the loops are not formed, the sweetfish tip of the pot cannot catch the loops, resulting in skipped stitches.

[Means for solving the problem] In order to eliminate the above-mentioned sticky defects, an auxiliary presser foot is provided at the foot of the presser foot, and when the foot of the presser foot crosses the stepped part of the fabric, the foot of the presser foot is The above-mentioned drawbacks have been eliminated by making the tip of the auxiliary presser foot protrude from the needle hole to press the cloth.

[Example code] The present invention will be explained below based on examples.

FIG. 1 is a perspective view of the foot 1 of the presser foot 1 according to the present invention.
In a, a needle drop hole 1b is formed in the middle part, and a holding part IC is provided protrudingly in front of the needle drop hole 1b on the upper surface of the front half.

Reference numeral 2 denotes a leaf spring serving as an auxiliary presser foot, the base of which is fixed to a pin 3 supported on the holding part IC of the presser foot 1, and the free end thereof is extended into the needle drop hole 1b' and bulged further downward. The curved part protrudes downward from the needle drop hole 1b of the presser foot 1, and when the presser foot 1 presses the fabric F against the throat plate 5, the curved part is in front of the needle drop point. The cloth F is pressed against the throat plate 5. When sewing a stepped part of the fabric F using the presser foot 1 with the above-described solid structure, the foot 1 of the presser foot 1 is sewn at the border between the flat part and the stepped part of the fabric F, as shown in Figure 2.
The front half of a presses the step part of the cloth F onto the throat plate 5, the middle part moves away from the cloth F, and the rear half presses the flat part of the cloth F onto the throat plate 5. In this state, when the needle 4, which holds the upper thread at its tip, passes through the needle drop hole 1b of the presser foot 1 and inserts the fabric F, when the needle 4 rises, the fabric F moves upward due to friction with the needle 4. However, the fabric F in front of the needle drop point is pulled due to the curved part of the auxiliary presser foot 2 that protrudes downward from the needle drop hole 1b of the presser foot 1.
is pressed onto the throat plate 5, and the needle thread held at the tip of the needle 4 is tightened by the fabric F as the needle 4 rises, forming a loop. The tip of the hook that holds the bobbin thread catches this loop of the upper thread,
The hook passes through the loop, the upper thread intersects with the lower thread, and the upper thread rises to form a knot with the lower thread, forming a seam.

The presser foot 1 that crosses the boundary between the flat part and the stepped part of the cloth F
While sewing the step part, the foot 1a of the presser foot 1 presses the fabric F against the needle plate 5, and at the same time, the curved part of the auxiliary presser foot 2 presses the fabric F in front of the needle drop point at the needle drop hole 1b of the presser foot 1. is pressed against the needle plate 5. At this time, the lower surface of the foot portion 1a of the presser foot 1 and the curved end portion of the auxiliary presser foot 2 are on the same plane.

After sewing the stepped portion of the cloth F, as the cloth F moves in the cloth feeding direction A, the rear half of the presser foot 1 presses the stepped portion of the cloth F, as shown in FIG. The front and middle parts of the foot portion 1a are separated from the upper surface of the fabric F, and the curved tip of the auxiliary presser foot 2 protrudes from the needle drop hole 1b of the presser foot 1 and presses the fabric F in front of the needle drop point. This allows the fabric F around the needle drop point to
When the needle 4, which has been lowered by sticking the fabric F under tension, rises, the needle thread is squeezed by the fabric F without being pulled upward, forming a loop, and the loop is passed through the hook. The tip of the needle catches it, the upper thread and lower thread intersect, and by pulling up the upper thread, a knot is created and a seam is formed.

After that, the flat part of the fabric F is sewn, but at this time presser foot 1
The foot portion 1a presses the fabric F onto the throat plate 5, and the curved end of the auxiliary presser foot 2 also presses the fabric F onto the throat plate 5, applying tension to the fabric F before the needle drop point and causing the needle 5 to move up and down. The movement forms a seam.

[Other Embodiments] In the above embodiments, an example of lock stitching is shown, but lock stitching has the same effect. The above embodiment uses a leaf spring as the auxiliary presser, but wire may also be used.
In addition, although the base of the auxiliary presser foot 2 was fixed to the pin 3, the base was made into a cylindrical shape to loosely fit into the bottle 3, and one end was fixed to the pin 3.
The same effect can be obtained by providing a coiled spring whose middle part is wound around the bottle 3 so as to be fixed to the holding part IC of the auxiliary presser 2 and press the upper surface of the auxiliary presser 2 downward at the other end. Further, in the above embodiment, the auxiliary presser foot 2 was provided so as to extend from the front half of the foot 1a of the presser foot 1 to the needle drop hole 1b, but the auxiliary presser 2 was provided at the rear half of the foot 1a of the presser foot 1. Alternatively, it may be provided so as to extend from the intermediate portion to the needle drop hole 1b.

Further, in the above embodiment, the curved portion of the auxiliary presser foot 2 presses the cloth in front of the needle drop point, but the curved portion may press the cloth behind the needle drop point.

[Effects of the Invention] As explained above, according to the present invention, by providing the auxiliary presser foot 2 on the foot portion 1a of the presser foot 1 to press the cloth F around the needle drop point onto the throat plate 5, Needle insertion and nail removal are very effective in preventing the fabric F from flapping and creating beautiful seams without skipped stitches.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 and FIG.
The figure is an explanatory diagram of the operation of the present invention. 1... Presser foot 2... Auxiliary presser foot 3... Bottle 4... Needle 5... Throat plate

Claims (1)

[Claims] The base end is supported by the foot of the presser foot, and the free end is extended into the needle hole of the presser foot so as to press the fabric around the needle drop point against the throat plate. 1. A presser foot for a sewing machine, comprising an auxiliary presser foot made of an elastic body whose free end protrudes and retracts from the lower end of the needle hole of the presser foot as the presser foot moves toward and away from the cloth.