JPS5822237B2 - Function variable presser foot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cloth presser foot for a sewing machine, and its purpose is to smoothly feed the cloth at the beginning of sewing thick cloth, that is, to sew steps to upward step portions. To provide a cloth presser which is automatically converted into a free foot which allows wave-like movement after passing through a section, and allows sewing to be performed in the best condition from the beginning to the end of sewing.

Conventionally, a so-called free leg presser foot has been widely used in home sewing machines, in which the presser foot portion can move in a wave pattern to suit various conditions such as flat stitching and step stitching.

However, in recent years, the performance of home sewing machines has improved and it has become possible to sew considerably thicker fabrics.

As a result, when such thick cloth is sewn using the above-mentioned free leg gage, the undesirable results described above occur.

That is, FIG. 3 shows a situation in which a thick material is sewn using a conventional free leg foot, in which the presser foot 20' is used to press down the beginning of sewing of a thick cloth 10.
As can be seen in the figure, the bottom surface 25' of the holding part 20' is
has a large upward angle toward the front, and therefore, the feed dog 9 only scratches the edge of the fabric near the needle hole 28', making it difficult to apply an effective force for feeding the fabric, and the fabric is not fed. The back side of the machine was damaged by the feed dog, which was extremely inconvenient.

Therefore, the present invention was developed to eliminate such drawbacks, and as shown in the embodiment, it uses a fixed presser foot that is held in an almost horizontal state with the front side facing slightly upward at the beginning of sewing.
We have developed a presser foot that automatically changes its function from a fixed presser foot to a free foot with a movable presser foot after sewing a suitable distance.

The present invention will be described in detail below with reference to the drawings. Reference numeral 1 denotes a known holder, and 2 a cloth presser foot. The presser foot 20 of the cloth presser is provided with a needle hole 28 as shown in the first figure, and a pin 3 is provided on the upper surface. side walls 21 and 22 that horizontally support the second pin 4, and a bearing 23 that rotatably supports the second pin 4, each of which is disposed in a direction ζ perpendicular to the cloth feeding direction.

The movable pin 4 consists of a large diameter part 41 provided at the outer end and a sliding part 42 which is a small diameter part. The push button 6 is integrally fitted and fixed, and the coil spring 5 is inserted between the button and the outer wall 26 of the bearing.

The presser foot 2 is engaged with the vertical groove 11 of the holder 1 attached to the presser rod 1 via the fixing pin 3, and the holding spring 8
The movable pin 4 is held in a fixed state by inserting the large diameter part 41 into the hole 12 formed on the side surface of the holder 1, as shown in FIGS. 4 and 7. be done.

That is, the sliding part of the movable pin 4 is inserted into the bearing hole 24, and the coil spring 5 acts on the push button 6 as shown in FIG. It is stabilized by being pressed against it.

Therefore, when starting to sew thick materials, press the push button 6 against the coil spring 5 while lowering the presser foot 2 to insert the large diameter portion 41 into the lateral groove 12 as shown in the first figure and completely press the presser foot 2. When lowered, the bottom surface 25 of the presser foot under the needle hole 28 presses near the end of the thick cloth 10 as shown in the fourth figure, and the presser foot 20 is in an almost horizontal state with the front side of the sewing facing slightly upward, so the fixing pin 3 is A clockwise moment force acts on the movable pin 4 as a shaft, pressing the lower side of the large diameter portion 41 within the lateral groove 12.

Therefore, a large frictional force is generated in the axial direction of the large diameter portion 41, and the round diameter portion is stopped in the groove 12 against the action of the spring 5, and as a result, the valve foot 2 is held by the pins 3 and 4. It works as a fixed presser foot.

This state continues for a short time from the beginning of sewing, and the cloth feeding force acts effectively, and when the edge of the cloth passes near the fixing pin 3, the bottom surface 25 of the presser foot becomes almost horizontal, and the cloth 10 is evenly spread. It will be held down.

In this state, the moment force acting on the movable pin 4 disappears, and the large diameter portion 41 comes out of the groove 12 under the action of the spring 5 and automatically restores to the state shown in FIG. 6.

Therefore, the presser foot 2 is connected to the holder 1 only by the fixing pin 3, and from then on it functions as a free leg foot, and the movable angle is free when sewing downward rows as shown in Figure 5. That's what you get.

As described above, the present invention has a fixed function and a movable function, and when sewing thick materials, the fixed function is first set and sewing is started, and shortly after sewing begins, the leg foot is automatically converted to a free leg with a movable function. It is capable of performing sewing work under optimal conditions from the beginning of sewing to the end of sewing, and eliminates the drawbacks of conventional presser feet, and has a precision that cannot be obtained with conventional presser feet. It greatly contributes to improving the quality of life, and has extremely high practical value.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a presser foot according to an embodiment of the present invention, Fig. 2 is a perspective view of a holder that holds the presser foot shown in Fig. 1, Fig. 3 is a front view of a conventional presser foot in use, and Fig. 4 is a front view of the presser foot of this embodiment in a fixed function state, FIG. 5 is a front view of the presser foot of this embodiment in a movable function state, and FIG. 6 is a sectional side view of the presser foot of the present embodiment in a movable state.
FIG. 7 is a sectional side view of FIG. 4 in a fixed state. 1 is a holder, 2 is a presser foot, 4 is a pin, 5 is a spring, 1
1 is a presser bar, 12 is an engagement hole, and 28 is a pit hole.

Claims (1)

[Claims] 1. A holder fixed to a presser bar, a presser foot supported swingably at the lower end of the holder and having a hole formed therein, and a presser foot supported by the presser foot and constantly pressed outward by a spring. It consists of a pin inserted into the retaining hole and a retaining hole provided in the holder so that the inner end of the pin can be inserted. The fixed state with the presser foot is maintained, and when the presser foot moves to a horizontal position after sewing a few stitches, the pin is removed from the hole and the holder and presser foot automatically become swingable. Type presser foot.