JPS6016376Y2 - Holder structure of detachable presser foot for sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a holder in a detachable presser foot for a sewing machine, in which a presser foot piece and a holder are detachably attached, and the holder has a ruler bar attachment portion.

Conventionally, the presser foot piece and holder were not detachably attached, and
In a holder for a removable presser foot for a sewing machine that has a ruler bar attachment part on the holder, a recess 2 is provided in the lower half of the rear part of the holder 1, as shown in FIG.
A tongue piece 4 formed on a lever 3 made of an elastic resin material is attached to the lower end of the lever 3 by a pin 5 whose both ends are fitted to both side walls 2b of the recess 2 so as to press the tongue piece 4 into contact with the lever 3. The base end of the cotton material 6 is fitted into the integrally formed cotton material attachment part 3a, and the cotton material 6 is inserted into the through hole 7 formed at the bottom of the holder 1 that penetrates in the front-rear direction, and the tip thereof is attached to the holder. A ruler rod mounting member that can freely move in and out of a fitting groove 8 that fits into a shaft provided in a cloth presser (not shown) formed on the front lower surface of the holder 1, and that passes through the upper rear part of the holder 1 in the left and right direction. Fitting hole 9
Then, a ruler rod attachment member 1o having a ruler rod attachment hole 10a penetrating in the left-right direction was fitted into the insertion hole 9.

Therefore, this conventional structure requires a pin 5 for attaching the lever 3, and in order to attach the pin 5 to the holder 1, a hole must be machined in the holder 1. This work is difficult because jigs and tools must be used to press-fit the pin 5 into the hole, and the work of installing the lever and the work of installing the ruler bar mounting member are performed separately. in order to have to
There is a problem in that the assembly requires time.

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide a holder for a removable presser foot for sewing machines that has a small number of parts, a simple structure, and is easy to assemble. It is something to do.

For this reason, in the present invention, the structure of the holder includes a cotton material attachment part into which the base end of the cotton material is fitted, and a part of the lever that operates the cotton material.
The ruler bar attachment part is integrally molded from a resilient resin material, and tapered locking protrusions are formed on the rear of both sides of the ruler bar attachment part, and the back surface of the holder body is An engaging stepped portion is provided which is open from the lower surface to the upper surface and is engaged with both edges of the lower end of the ruler rod attachment portion above the inner wall surface of both side walls of the holder main body, and a ruler is provided above the engaged stepped portion. A window for attaching the rod is opened, and the protrusion is locked at the rear edge of the window.

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

Reference numeral A denotes a detachable presser foot for a sewing machine, which is composed of a holder a attached to the sewing machine main body (not shown) and a cloth presser foot piece that can be attached to and detached from the holder a.

The holder a includes a holder main body 11, a cotton material 12 attached to the holder main body 11, and a base end 12a of the cotton material 12.
It is comprised of a cotton material attachment part 13 into which the cotton material 12 is fitted, a lever portion 14 which operates the advance and retreat of the cotton material 12, and a ruler rod attachment part 15 to which a ruler rod (not shown) is attached.

The cotton mounting portion 13, the lever portion 14, and the ruler rod mounting portion 15 are integrally molded from a resilient resin material, and are formed in the rear half of the holder body 11, with the back surface extending from the top surface to the bottom surface. It is adapted to be fitted and locked into a fitting portion 16 which has an open cross-sectional shape.

That is, the lower surface of the ruler rod attachment part 15 is formed with a substantially doglegged leg part 17, and the tip of the leg part 17 is formed with a thin hinge part 18, which has a substantially triangular shape. The protrusion 14a of the lever portion 14 is connected to the protrusion 14a.

A cotton attachment part 13 is continuously formed at the lower end of the lever part 14, and a thin hinge part 19 is formed at the connecting part. gender is given.

The base end 12a of the cotton material 12 is fitted to the tip of the cotton material attachment part 13.

Further, a tongue-shaped piece 21 that engages with a stopper piece 20 protruding from the lower end of the front wall 16a of the fitting part 16 of the holder main body 11 is integrally provided at the upper part of the base end of the cotton material attachment part 13. It is formed as follows.

The ruler rod mounting portion 15 has a ruler rod insertion hole 22 penetrating in the left-right direction and a play hole 23 below the ruler rod insertion hole 22, and a thin plate piece 24 is formed between the ruler rod insertion hole 22 and the play hole 23. It is designed to support a ruler rod (not shown).

Further, at the rear of both side surfaces of the ruler rod attachment portion 15, locking protrusions 25 are formed which are tapered in width from the front to the rear so that the rear ends protrude from the side surfaces. .

The holder main body 11 is made of a resin material that is harder than the resin material that integrally forms the ruler rod attachment portion 15 and the like, and the ruler rod attachment portion is provided above the inner wall surface of both side walls 16b of the fitting portion 16. An engagement step 26 is provided with which both lower edges 15a of the porthole 27 are engaged, and a ruler rod attachment preparation 27 is provided above the engagement step 26 and penetrates in the left-right direction. It is designed to lock the protrusion 25.

A fitting groove 29 is provided on the lower front side of the holder main body 11 to fit into a shaft 28 provided across the work clamp, and the fitting groove 29 passes through the rear surface of the holder main body 11. A through hole 30 for cotton material is provided.

To attach the ruler rod attachment part 15 etc. to the holder main body 11, the tip 12b of the cotton material 12 is inserted into the through hole 30, and the lower end edges 15a of the ruler rod attachment part 15 are connected to the engagement step part. 26 and push it in.

At this time, both side walls 16b of the fitting part 16 of the holder main body 11
are once pushed apart by the tapered surfaces 25a of the protrusions 25 formed on both sides of the ruler rod attachment part 15, but the protrusions 2
5 reaches the window 27, the both side walls 16b return to their original state due to their elasticity, the protrusion 25 is locked by the rear edge 27a of the porthole 27, and the tip 12b of the cotton material 12 is inserted into the fitting groove 29. stand out.

Also, at this point, the stepped portion 15b formed at the upper front end of the ruler rod attachment portion 15 is aligned with the fitting portion 1 of the holder main body 11.
The ruler bar attachment part 15 is engaged with a stopper part 16e formed on the upper surface of the ruler bar 6, and the ruler bar attachment part 15 is fixed by the stopper part 16c and the rear edge 27a of the window 27.

Thereby, by operating the lever part 14, the cotton material 12 is moved forward and backward, and the tip end 12b is moved into and out of the fitting groove 29, thereby making it possible to attach and detach the cloth presser.

The tongue-like piece 21 engaged with the stopper piece 20 is made of cotton material 12.
It has elasticity that urges the cloth presser shaft 28 upwardly and presses the shaft 28 of the cloth presser above the fitting groove 29.

Incidentally, in the above embodiment, the holder main body 11 is made of a hard resin material, but it may also be made of a mineral or the like.

In this case, the protrusions 2 formed on both sides of the ruler rod attachment part 15
5 can be retracted into both sides and return to its original state when it engages with the window 27.

As described above, according to the present invention, the cotton attachment part, the lever part, and the ruler rod attachment part are integrally molded from a resilient resin material, and are fitted into the fitting part of the holder main body. Therefore, there is no need for a locking bin to attach the lever as in the past.

Therefore, the drilling process for press-fitting the pin into the holder body is omitted.

In addition, since the ruler rod attachment part is fixed between the stopper part formed on the holder body and the rear edge of the window, assembly can be easily done by hand without the need for jigs or tools. Can be attached.

Furthermore, the stopper piece provided on the holder body has the effect that the amount of protrusion of the tip of the cotton material into the fitting groove can be determined.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a conventional holder structure, Fig. 2 is a perspective view showing a holder structure according to the present invention,
FIG. 3 is an exploded perspective view of the same as the above, and FIG. 4 is a side sectional view showing a state in which it is attached to a cloth presser. A is a detachable presser foot for a sewing machine, a is a holder, b is a cloth presser, 11 is a holder main body, 13 is a cotton material attachment part, 14 is a part of a lever, 15 is a ruler bar attachment part, 15b is a step part, 16 is a fitting part, 1.6e is a stopper part, 20 is a stopper piece, 2
1 is a tongue-like piece, 25 is a locking projection, 26 is a fitting step, 27
is a window.

Claims (1)

[Scope of utility model registration request] A removable presser foot for a sewing machine in which a cloth presser foot piece and a holder are detachably attached, and the holder has a ruler bar attachment part, and the cotton material attachment part fits the base end of the cotton material, and the cotton material is operated. The lever part and the ruler bar attachment part are integrally molded from a resilient resin material, and tapered locking protrusions are formed at the rear of both sides of the ruler bar attachment part. The back surface of one main body is open from the lower surface to the upper surface, and an engaging stepped portion is provided above the inner wall surface of both side walls of the holder main body, with which both edges of the lower end of the ruler rod attachment portion are engaged, and the engaging step is provided. 1. A holder structure for a removable presser foot for a sewing machine, characterized in that a window for attaching a ruler bar is provided above the section, and the protrusion is locked at the rear edge of the window section.