JPS6020995Y2 - Presser foot for button hole sewing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a presser foot for a buttonhole sewing machine.

Conventionally, the presser foot main body of a cloth presser used for sewing button holes has a lug with a horizontal pin 2 for attaching the presser main body 1 to a mounting leg piece (not shown), as shown in Fig. 1. Only a needle hole 4 is made in the front of the piece 3, and there is a slight gap between the lower surface of the presser main body 1 and the fabric 6 in consideration of the case where a string 5 is inserted around the periphery of the button hole. Since it is designed to have a gap, stitches may be skipped during sewing.
As shown in Figure 3, when sewing two or three times around the button hole, the height increases by an amount of X, and there is a risk that the central protrusion on the lower surface of the presser foot body 1 may get caught there, causing a seam jam. .

The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a presser foot for a buttonhole sewing machine that can securely sew without skipping stitches or clogging stitches. This is the purpose.

The present invention will be described below with reference to illustrative embodiments.

Reference numeral A denotes a presser foot for a button hole, which is composed of a presser main body a and a presser frame, both of which are made of resin and have a bottom shape.

A horizontally long needle hole 13 is formed in the center of the front end of the presser main body a, and on both sides of the upper surface behind the needle hole 13,
Ear pieces 11, 11 extend from the approximate center of the presser main body a to the rear.
is erected, and a horizontal pin 12 for attaching to the mounting leg piece B is provided across the front end of the ear piece 11°11.

Passing between the rear edge of the needle hole 13 and the ears 11, 11 from approximately the middle of both side edges of the presser main body a and both side edges of the needle hole 13;
Further, along the inner edge of the ear piece 11.11, the ear piece 11,
A cutout groove 14.14 is formed which extends to approximately the rear end of the ear piece 11 and has an open front end, and an elastic piece 21 is formed between the ear piece 11.11 by the cutout groove 14,14. ,
A peripheral frame 22 is formed around the periphery of the needle drop hole 13, and elasticity is imparted to the peripheral frame 22.

Reference numeral 15 denotes a gauge protrusion protruding from the upper surface of one side edge of the surrounding frame 22, and 16 and 16 indicate a pair of recesses formed on the lower surface of the front and rear edges of the surrounding frame 22, which are used for buttons drilled into fabric, etc. This is for passing a string 5 interposed for centering around the periphery of the hole (not shown).

The presser frame has an elongated hole 23 formed in the center of the bottom surface thereof in correspondence with the button hole, through which the sewing machine needle passes, along the longitudinal direction, and the presser main body a is slidably provided on both sides in the longitudinal direction. A sliding portion 18°18 for fitting is formed.

A sliding protrusion 19° 19 is formed on the bottom surface where the slide portion 18. A projection 17.17 is formed.

Note that both side edges of the recesses 16, 16 formed on the lower surface of the peripheral frame 22 of the presser main body a and the tip of the central protrusion are flush with the tip of the cloth slip prevention protrusion, or are slightly flat. It is designed to stand out.

Further, the rear frame 24 of the presser frame has a bottom shaped separately from the presser frame, and after fitting the presser main body a into the presser frame,
An engagement hole 26 that is fitted into the rear edge of the presser frame, and a locking claw 25 that projects from the lower surface of the rear frame 24 is inserted into the rear edge of the presser frame.
Fixed by engaging with.

By molding the rear frame 24 separately in this way, the work of attaching the presser foot A can be facilitated.

Reference numerals 20 and 21 indicate strap hooking portions formed on the front and rear edges of the presser frame.

As described above, according to the present invention, the needle passes from approximately midway between both side edges of the presser foot body and both side edges of the needle droplet, between the rear edge of the needle droplet and the lug, and then to the inner edge of both lug. A cutout groove is formed along the edge of the lug to approximately the rear end thereof and has an open front end, and an elastic piece is formed between the lug pieces by the cutout groove, and the elastic piece is formed in the peripheral frame of the needle hole. I tried to give it elasticity, so
It can smoothly go over strings and sewing threads without creating a gap between the fabric and the area around the needle hole, so sewing can be performed reliably without skipping stitches or clogging stitches. .

[Brief explanation of drawings]

Fig. 1 is a plan view of the main body of a conventional presser foot for buttonholes, Fig. 2 is a plan view showing the sewing state when a string is interposed,
Fig. 3 is a front view showing the height relationship with the fabric as above, Fig. 4 is a perspective view of the presser foot for button holes according to the present invention, Fig. 5 is an exploded perspective view of the same as above, and Fig. 6 is the main body of the presser foot. Fig. 7 is an enlarged sectional view taken along line ■-I in Fig. 4, and Fig. 8 is a plan view taken along ■-I in Fig. 4.
■It is a line enlarged sectional view. A is the presser foot for button holes, a is the presser foot body, b is the presser frame,
13 is a needle hole, 14 is a notched groove, 21 is an elastic piece, and 22 is a surrounding frame.

Claims (1)

[Scope of utility model registration request] It is molded from a resin material, has a transversely long needle hole bored in the center of the front end, and has tabs erected on both sides of the rear of the needle hole, and is attached to the mounting leg piece at the front end of the tab. The presser main body has a horizontal pin installed therein, and a long hole corresponding to the button hole is bored in the center of the bottom along the longitudinal direction, and the presser main body is slidably fitted on both sides in the longitudinal direction. In a presser foot for a button hole, the presser foot is constructed of a presser foot frame having a slide portion formed therein, and the presser foot is formed from approximately the middle of both side edges of the presser foot body and both side edges of the needle droplet to the rear edge of the needle droplet and the lug. A notch groove is formed which extends along the inner edge of both ear pieces to approximately the rear end of the ear piece and has an open front end, and the elastic piece between the ear pieces is formed by the cut groove. A presser foot for a button hole sewing machine, characterized in that a frame surrounding the needle droplet is provided with elasticity.