JPH0223244Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a presser foot for a sewing machine, and in particular to a presser foot suitable for use in sewing cloth that has stepped portions such as seams or pleats. Regarding.

Prior Art There are two types of presser feet: one that can tilt freely in the vertical direction and one that is fixed. For example, in an overlock sewing machine, there is one that is rotatably supported vertically on the sewing machine frame, and one that is tiltably supported on the free end of the presser foot, which is normally pressed downward by an elastic device. There are presser feet that are fixed at a tilt of
The latter type of presser foot is suitable for sewing stretchy fabrics such as stockinette, so a fixed type presser foot is usually used when sewing thin stockinette, etc., but for underwear etc., the side seam part is The stitching creates a stepped section, and if a fixed presser foot is used to sew over this step, it will cause a sewing jam, making it unsuitable for sewing the stepped section. Therefore, a tiltable presser foot is used to sew such items, and when it comes into contact with a stepped part, it tilts forward and upward as shown in Figure 4, and the presser foot goes over the part. As shown in the figure, the presser foot 1 is supported by the shaft support 2 in the middle, so when the front part rises, the rear part descends, and if the sewing speed increases, the rear part of the presser foot hits the top surface of the fabric, causing shocking contact. You will start to do this. This impactful contact is especially strong during high-speed sewing, such as with industrial sewing machines, and can damage or damage fabrics such as linen stockinette.

Problems to be Solved by the Invention This invention attempts to solve the above-mentioned problems by preventing the rear part of the presser foot from making impactful contact with the cloth during step sewing.

Means for Solving the Problems Therefore, the present invention provides a regulating member on either the presser foot or the presser foot, and an engaging portion that engages with the regulating member when the presser foot is tilted on the other side. This prevents the presser foot from rotating more than this, and also allows the mounting position of the regulating member to be adjusted, thereby making it possible to adjust the amount of rotation of the presser foot.

The regulating member and the engaging part in the present invention are as follows:
For example, a stopper is attached to the presser foot so that its front and back position can be adjusted, a regulation plate is fixed to the rear of the presser foot and comes into contact with the stopper when the presser foot is tilted forward by a certain amount, and a bracket is fixed to the presser foot. Examples include a regulating bar and a front part of a presser foot that are attached to the bracket so that their vertical positions can be adjusted.

The presser foot of this invention can be used not only for overlock sewing machines but also for lockstitch sewing machines and other various sewing machines, and can also be used for general fabrics with stepped sections, such as sewing seams and pleating. .

Embodiment Each of the figures shows a presser foot device for an overlock sewing machine. In Figures 1 and 2, 3 is pivotally supported on a sewing machine frame (not shown) so as to be rotatable vertically and horizontally. (not shown), a presser foot 5 is fixed to a shaft portion 4 at the free end, and the presser foot has a shaft support 2 extending horizontally at its lower end, and the shaft support 2 is held between a presser foot 1 that receives it from below and a leaf spring 8 that is fixed to the presser foot with a screw 7, whereby the presser foot 1 is supported rotatably around the pivot support 2. ing. A stopper 11 is also fixed to the side surface of the presser foot 3 together with an eccentric cam 9 by a screw 12, and the stopper 11 has an adjustment portion 13 that bends laterally.
The adjusting part 13 has a contact part 15 bent upward from the joint part 14 to the upper surface of the presser foot, and the adjusting part 13 engages with the circumferential surface of the eccentric cam 9, and when the eccentric cam 9 is rotated, the stopper 11 is The position is adjusted in the front and back direction along the presser foot 3 (for this reason, the stopper has a hole, not shown, through which the screw 12 passes, as a long hole in the front and back direction). On the other hand, presser foot 1
An L-shaped regulating plate 16 is fixed to the rear of the plate, and an arc-shaped groove 17 centered on the shaft support 2 is provided in the middle of the upwardly extending portion, and a guide screw 18 is inserted through the groove 17. The presser foot 1 is fixed to the base 3 and can be tilted about the shaft support 2 within the range of the groove 17. One side of the upper end of the regulating plate protruding from the presser foot 3 is cut off diagonally, and the stopper 11
It is adapted to be able to engage with the contact portion 15 of. In the figure, 19 is a throat plate, 21 is a differential feed dog, 22 is a main feed dog, and 23 is a needle.

Next, the function of the presser foot will be explained.

When the sewing machine is started after the cloth W is inserted and set under the presser foot in the usual manner, the cloth W is fed in the direction of the arrow in FIG. 2 by the main feed dog 22 and the differential feed dog 21, but the step When S reaches presser foot 1 and advances further, the front part of the presser foot is first pushed up,
Rotate the presser foot 1 around the pivot support 2 in the clockwise direction in FIG. As a result, the rear part of the presser foot lowers,
On the way, the regulation plate 16 engages with the contact portion 15 of the stopper 11, and as a result, further rotation of the presser foot 1 is restrained, and impactful contact of the rear part of the presser foot with the upper surface of the fabric is prevented. Ru. Step s crosses shaft support 2,
When the rear part of the presser foot is reached, the rear part of the presser foot is pushed up by the stepped portion, and the presser foot 1 is rotated counterclockwise about the shaft support 2. Accordingly, the regulating plate 16 is separated from the contact portion 15 of the stopper 11. In this manner, the stepped portion s passes under the presser foot as the fabric advances without causing any jams.

FIG. 3 shows another embodiment, in which a bracket 25 is fixed to the shaft portion 4 of the presser foot 3, a regulating rod 26 is slidably inserted in the vertical direction into the clamping portion at the free end of the bracket 25, and a set screw 27 is inserted. The lower end is positioned above the presser foot.

This presser foot is similar to the above-mentioned presser foot, and when the step s of the cloth W pushes up the front part of the presser foot and rotates the presser foot 1 clockwise, the lower end of the regulating bar comes into contact with the front part of the presser foot. Therefore, further rotation is restrained, and impactful contact with the fabric at the rear of the presser foot is prevented. Next, when the stepped portion moves to the rear part of the presser foot, the presser foot rotates counterclockwise, and the front part of the presser foot separates from the lower end of the regulating rod.

Effects of the invention As described above, the presser foot of this invention is constructed so that it does not rotate more than a certain amount, and the rear part of the presser foot does not hit the top surface of the fabric during step sewing, preventing impactful contact.
Therefore, excellent sewing can be performed without damaging or tearing the fabric.

Moreover, the amount of rotation of the presser foot can be adjusted according to the stepped portion and the thickness of the cloth by adjusting the mounting position of the regulating member.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the presser foot according to the present invention, Fig. 2 is a front view of the same, Fig. 3 is a perspective view of another embodiment, and Fig. 4 is a perspective view of the presser foot according to the present invention.
The figure shows a front view of a conventional example. 1... Presser foot, 2... Pivot support, 3... Presser foot,
5... Presser foot, 9... Eccentric cam, 11... Stopper, 13... Adjustment section, 15... Contact section, 16...
...Regulation plate, 25...Bracket, 26...Regulation rod.

Claims (1)

[Scope of utility model registration request] It is attached to a presser foot and supported so as to be pivotable around a horizontal axis, and is configured to tilt upward in the forward direction and climb over the step when the step reaches the front part of the presser foot during step sewing. In the presser foot of a sewing machine, either the presser foot or the presser foot is provided with a regulating member whose mounting position can be adjusted, and the other is provided with an engaging portion that engages with the regulating member when the presser foot is tilted. A sewing machine presser foot that regulates the amount of inclination of the front edge of the presser foot, and allows the maximum amount of inclination of the presser foot to be adjusted by changing the mounting position of the regulating member.