JPS6215030Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to a presser foot device for a sewing machine.

PRIOR ART As a conventional presser foot device for a sewing machine, a support member is removably fixed to a presser bar, and the support member is The presser foot is rotatably attached, and the intermediate winding part of the torsion spring is fitted to the pin protruding from the side surface of the support member, and both ends of the torsion spring are attached to the front surface of the support member and the upper surface of the front end of the presser foot. Some are configured to lock and apply downward rotational force to the front end of the presser foot.

However, in this conventional presser foot device,
The torsion spring is attached to the side surface of the support member, one end of which extends toward the front of the support member, and the other end of which extends forward along the top surface of the presser foot. The process is complicated and not only spoils the overall appearance of the presser foot device, but also has the drawback that the torsion spring itself requires a large amount of material.

Purpose of the invention This invention solves the above-mentioned defects in the conventional presser foot device, makes the structure of the spring part for rotationally biasing the presser foot compact, and maintains a good appearance of the entire device. To provide a novel presser foot device for a sewing machine which can reduce the amount of material used for the spring itself.

Structure of the Device In order to achieve the above object, in this device, a support member is removably attached to a presser bar, a presser foot is rotatably attached to the support member, and the attachment portion of the presser foot is A spring is provided, one end of which is fixed to the upper surface of the rear presser foot, the winding part is positioned rearward from the one end, and the other end extends upward, and the other end of the spring is slidable on the front side. A removably engageable engagement body is disposed on the support member.

Embodiment Hereinafter, an embodiment of this invention will be described with reference to the drawings. In the drawing, reference numeral 1 indicates a presser bar of a sewing machine, and a support member 3 is detachably fixed to the lower end of the presser bar by a screw 2. As shown in FIG. 2, a guide hole 5 extending in the front-rear direction is formed in the lower surface of the front end of the support member 3 near the rear of a groove 4 that opens downward. An operating lever 7 is rotatably attached to the rear part of the support member 3 by a pin 6, and an operating button 8 is provided at one end of the operating lever 7, and the other end is inserted through the guide hole 5 to the lower part of the concave groove 4. An opening/closing rod 9 is attached which extends to open and close the lower opening of the groove 4. By the action of a coiled spring 10 provided on the operating lever 7, the opening/closing rod 9 is always biased and held in the closed position of the groove 4 shown by a solid line in FIG.

The presser foot 11 has a mounting shaft 13 as a mounting portion installed between a pair of support pieces 12 formed at the rear of the upper surface, and this mounting shaft 13 is inserted into the groove 4 of the support member 3.
The support member 3 is rotatably attached to the support member 3 while being engaged with the support member 3. Further, as shown by the chain line in FIG. 2, this presser foot 11 is operated when the opening/closing rod 9 is moved to the open position of the concave groove 4 based on the rotation of the operating lever 7.
By engaging and disengaging the mounting shaft 13 in the groove 4, it can be easily attached to and detached from the support member 3.

A presser foot 11 is located behind the mounting shaft 13.
A spring 15 is fixed to one side of the upper surface of the spring 15 by a screw 14 at an annular fixing portion 16 at one end thereof. The spring 15 is positioned rearward of this fixed part 16.
A winding part 17 formed by winding a wire twice is formed in the middle of the winding part 17, and the other end of a spring 15 extending upward from the winding part 17 is formed by bending a wire into a substantially inverted U-shape when viewed from the front. An engaging portion 18 is formed.

On the other hand, an engagement pin 19 as an engagement body is provided protruding from one side of the support member 3. With the presser foot 11 attached to the support member 3, this engagement pin 19 is slidably engaged with the engagement portion 18 of the spring 15 on the front side, and the action of the spring 15 causes the presser foot to The front end of the sewing machine 11 is rotated downwardly, so that presser foot pressure is applied to the workpiece cloth being transferred along the workpiece support surface on the upper surface of the sewing machine bed 20 and throat plate 21.

In addition, 22 is a cover for a cutter which is formed to protrude upwardly near the front end of one side of the presser foot 11;
is a tongue piece attached to the presser foot 11 by a screw 24 at the rear thereof, and a small tongue piece 25 provided on the throat plate 21 or the throat plate 21 as necessary.
It is adapted to cooperate with a tongue (not shown) exposed above to form a wrap or overedge stitch.

As described above, in this embodiment, the spring 15
The fixed part 16 at one end, the winding part 17 in the middle, and the engaging part 18 at the other end form a substantially L-shaped side surface. At 18, the spring 15 is engaged with the engagement pin 19 on the support member 3 to apply downward rotational force to the front end of the presser foot 11, so that both ends of the spring 15 are engaged with the engagement pin 19 on the support member 3. The structure of the spring 15 portion is compact, and the length of the spring 15 is shortened, so that material can be saved.

Note that this invention is not limited to the above-mentioned embodiments; for example, the presser foot 11 may be attached to the support member 3 so that it can only be rotated without being removable. It is also possible to change it arbitrarily and make it concrete.

Effects of the invention As detailed above, this invention consists of a support member that is removably fixed to the presser bar, a presser foot that is rotatably attached to the support member, and a a spring, one end of which is fixed to the upper surface of the presser foot, the winding portion of which is positioned rearward from the one end, and the other end of which extends upward; The other end of the spring is provided with an engaging body that slidably engages on the front side so that the front end of the presser foot is biased to rotate downward. The structure of the spring portion is made compact, and the appearance of the entire device can be kept good, and the material used for the spring itself can be reduced, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a presser foot device of a sewing machine embodying this invention, Fig. 2 is a cutaway side view, Fig. 3 is a plan view of the presser foot device, and Fig. 4 is a presser foot. FIG. DESCRIPTION OF SYMBOLS 1... Presser bar, 3... Support member, 11... Presser foot, 13... Mounting shaft as a mounting part, 15... Spring, 16... Fixed part at one end, 17... Middle winding part, 18... Engaging portion at the other end, 19... Engaging pin as an engaging body.

Claims (1)

[Claims for Utility Model Registration] 1. Support member 3 detachably attached to presser bar 1
and a presser foot 11 rotatably attached to the support member 3, one end of which is fixed to the upper surface of the presser foot 11 rearward of the attachment portion 13 of the presser foot 11, and the winding portion 17 is fixed to the upper surface of the presser foot 11 rearwardly from the attachment portion 13 of the presser foot 11. a spring 15 disposed on the support member 3 and having the other end extending upward;
A presser foot device for a sewing machine comprising an engaging body 19 that slidably engages with the other end of a spring 15 on the front side so that the front end of the presser foot 11 is rotated downwardly by the action of . 2. The presser foot device for a sewing machine according to claim 1, wherein the presser foot 11 is detachably attached to the support member 3.