JPS5920218Y2 - Sewing machine cloth slippage prevention device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a fabric slippage prevention device for a sewing machine.

Conventionally, various cloth slippage prevention devices have been provided in order to prevent cloth slippage, and one example is the Japanese Patent Publication No. 37-17
There is a technique disclosed in Japanese Patent No. 182.

However, in this technique, if the urging force of one of the two pressing springs becomes different from that of the other, the workpiece cloth will be tilted and the zigzag stitch will not work properly.

Furthermore, since it is not possible to appropriately change the biasing force of the push spring, it is not possible to bias the fabric to be processed against the presser foot in response to changes in fabric thickness.

The purpose of the present invention is to provide a device for preventing cloth slipping of a sewing machine that eliminates the above-mentioned problems. The single member is engaged so as to be biased upward to press the workpiece cloth against the presser foot, and the rod is appropriately rotated to apply the biasing force of the coil spring to the single member. The reason is that it is structured so that it can be changed.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 5, a needle plate 13 in which a needle hole 12 is formed is attached to the left side of a bed 11 of a sewing machine 10, and a needle plate 13 having a needle hole 12 formed therein is mounted on the needle plate 13 extending from an arm (when shown). A presser foot 16 attached to the presser bar 14 with screws 15 is located.

A concave portion 17 is carved in the bed 11 so as to be located in front of the needle plate 13 (on the right side in FIG. 1, and on the bottom side in FIG. 2). A mounting plate 18 is fitted.

Thus, a window 19 is formed in the mounting plate 18, and a pair of protrusions 20 and 21 protrude downward.
2 extends from the bottom to the top of the mounting plate 18 fitted into the window 19.

That is, as shown in FIG. 5, the tongue piece 22 has a cylindrical part 23, 24 at one end, a tongue part 25 at the other end, and a slightly inclined connecting part 26 at the middle part. The cylindrical parts 23 and 24 located between the protruding parts 20 and 21 are connected to the rod 27.
is rotatably supported.

Therefore, one end 27 a and the other end 27 of the rod 27
b are through holes 28.b formed in the projections 20.21, respectively.
29, one end 27a of the rod 27 is fixed to the protrusion 20 and the protrusion 21, respectively, with a screw 30 and the other end 27b of the rod 27 with a screw (as shown).

However, if you loosen the screw 30 and the screw (as shown),
The rod 27 is rotatable.

The rod 27 is prevented from moving in the axial direction by snap rings 31 and 32, and a groove 27C is cut in the radial direction on one end surface.

Further, the tongue portion 25 of the tongue piece 22 is connected to the curved upward portion 1 of the presser foot 16.
6a, and to achieve this, the tongue piece 22 is urged upward by a coil spring 33.

That is, the coil spring 33 is connected to the cylindrical portion 2 of the tongue piece 22.
3.24, one end 33a is fixed to the rod 27, and the other end 33b engages with the lower surface of the connecting part 26 of the tongue piece 22. There is.

As mentioned above, the tongue part of the tongue piece is biased upward with a uniform force by the coil spring, so the tongue part can press the workpiece fabric against the curved part of the presser foot with a uniform force. can.

Therefore, there is no possibility that the workpiece cloth will be tilted and the zigzag stitch will not work properly.

In addition, by loosening the screws fixing one end and the other end of the rod to the downward protrusion of the mounting plate, slightly rotating the rod, and tightening the screws again, the biasing force on the tongue of the coil spring can be applied. can be changed appropriately, so that the fabric to be processed can be pressed against the warped portion of the presser foot according to its thickness, which is of great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an embodiment of the fabric slippage prevention device for a sewing machine according to the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG.
(The presser foot is not shown), Figure 3 is the same as Figure 1ll-I.
FIG. 4 is a detailed sectional view taken along line II, FIG. 4 is a sectional view taken along line IV--IV in FIG. 3, and FIG. 5 is a perspective view of the tongue piece. 11...Bed, 16...Presser foot, 1
6 a...Curved portion, 17...Concave portion, 18...Mounting plate, 19...Window, 2
0, 21... A pair of downward protrusions, 22...
... tongue piece, 27 ... rod, 30 ...
Screw means, 33...spring.

Claims (1)

[Scope of utility model registration request] A concave portion carved into the bed and extending from the front toward the throat plate;
a mounting plate having a window and a pair of downward protrusions formed therein and fitted into the recess; a rod having one end and the other end rotatably supported by the l pair of downward protrusions, respectively; screw means for fixing one end and the other end of the rod to the pair of downward protrusions; a screw means extending upward from the lower side of the taking plate through the window; furthermore, a tongue piece at the other end is rotatably supported on the presser foot, and a tongue piece at the other end is located below the curved up part of the presser foot, and one end disposed on the outer periphery of the rod is fixed to the rod. A cloth slippage prevention device for a sewing machine, characterized in that the other end comprises a coil spring that biases the tongue piece upward.