JPS6243496Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a knee operating device for a sewing machine.

BACKGROUND ART Conventionally, in sewing machines, knee operating devices have been used for various purposes such as raising and lowering the presser foot, changing the feed amount during sewing, and changing the needle stop position.

Generally, as shown in FIG. 9, the knee operating device has a support leg B protruding from the lower surface of an oil pan A attached to a sewing machine table.
A support shaft c is rotatably supported around a horizontal axis, and a rod e is attached to this support shaft c via a mounting body d.
was fixed, and a knee rest g was fixed to this rod e via a mounting body f.

Therefore, when the knee rest g is operated by the worker's knee, the central part of the knee rest g moves along the locus A-A, which is a circular arc centered on the support axis c; The worker's knee part, which is opposite to the center part of the knee pad g, follows an approximate trajectory B- with the foot as the center.
It moves along a large circular arc as shown by line B. Therefore, when the knee pad g is operated, there is a difference of distance h between the two trajectories, and a relative movement occurs between the worker's knee and the knee pad g by the amount of the difference, and the worker's knee This may cause discomfort to the worker, damage the worker's pants and knee pads due to continuous work over a long period of time, or even cause defects such as scratches or breaks on the worker's own knee. Ta.

Purpose Therefore, the present invention aims to provide a knee operating device for a sewing machine that does not cause relative movement between the worker's knee and the knee pad when the worker operates the knee pad. be.

Solution This purpose is to rotatably support a rod on a support attached to a sewing machine table, to slidably support a sliding body on this rod, to attach a knee rest to the sliding body, and to attach a knee rest to the sliding body. This is accomplished by allowing relative movement between the rod and the slide when the rest is operated.

First Embodiment In FIGS. 1 to 3, an oil pan 1 of a known type is attached to a sewing machine table (not shown), and a sewing machine head (not shown) is mounted on the oil pan 1. It is placed there.

A presser foot 2 is supported on the frame of the sewing machine head so as to be movable up and down, a presser foot holder 3 is fixed to the intermediate portion, and a cloth presser foot 4 is attached to the lower end. A downward pressing force is applied to the presser bar 2 by a cloth presser spring 6 located between the presser bar holder 3 and a presser foot pressure adjusting screw 5 screwed into the frame. Reference numeral 7 denotes a first bell crank lever whose intermediate portion is rotatably supported by the frame, one arm 7a facing below the presser bar holder 3, and the other arm 7b connected to the second bell crank lever via a connecting rod 8. The bell crank lever 9 is connected to one arm 9a of the bell crank lever 9. The middle portion of the second bell crank lever 9 is also rotatably supported by the frame, and the upper end of the knee raising bar is connected to the other arm 9b. Reference numeral 11 denotes a push rod supported by the oil pan 1 so as to be movable up and down, and the enlarged diameter portion at the upper end faces the lower end of the knee raiser rod 10.

The support shaft 12 is a support shaft that is rotatably supported around a horizontal axis with respect to the support leg 1a installed on the oil pan 1, and the middle portion of the actuating lever 14 is fixed to one end by a set screw 13. At the same time, a mounting body 15 is fixed to the other end by a set screw 16.
One arm of the operating lever 14 is connected to the push rod 1.
When the support shaft 12 is rotated counterclockwise in FIG.
Move 1 upward. Further, both arm portions of the operating lever 14 are provided with stopper screws 17 and 1, respectively.
8 is screwed in so as to be adjustable up and down, and engages with the lower surface of the oil pan 1 to set the clockwise and counterclockwise rotation amounts of the operating lever 14 and the support shaft 12 to appropriate amounts. A coil spring 19 is wound around the support shaft 12 and is locked between the operating lever 14 and the lower surface of the oil pan 1, and normally rotates the support shaft 12 counterclockwise in FIG. energizes the knee pad, which will be described later, to its inactive position. The rod, which is bent into an L-shape, consists of an arm 20a extending in the left-right direction and an arm 20b extending in the vertical direction, which is slidably inserted into the mounting body 15 and fixed by a set screw 21. . A collar 22 is inserted into the arm portion 20b of the rod 20 and fixed with a set screw 23.

Reference numeral 24 denotes a movable body manufactured by press working an iron plate, which includes a disk-shaped portion 24a and a pair of bent portions 24b and 24c formed by cutting and raising the disk-shaped portion 24a.
Furthermore, a pair of through holes 24d and 24e are formed in the bent portions 24b and 24c to be inserted into the arm portion 20b of the rod 20 so as to be movable in the vertical direction. As is clear from FIG. 3, the width of the through holes 24d and 24e is approximately equal to the diameter of the rod 20 in the C-C direction, and is longer than the diameter in the D-D direction. However, in the DD direction, as is clear from FIG. 2, the right ends of the pair of through holes 24d and 24e are located on the same vertical axis, and the left ends are different. Regarding the left end, the upper through hole 24d is formed to be located further to the left, in other words, to be a longer elongated hole. The coil spring 25 is located around the arm portion 20b of the rod 20 and stretched between the collar 22 and the bent portion 24b.

The knee pad 26 is made of an elastic soft material such as sponge or rubber, and is formed to have the cross-sectional shape shown in the figure. ing.

Since the first embodiment has the above configuration,
Now, when the knee pad 26 is operated to the right by the worker's knee, the rod 20 is moved counterclockwise in FIGS. As a result, the operating lever 14 is rotated to push up the push rod 11 and the knee raiser rod 10, and the first bell crank lever 7 is activated via the second bell crank lever 9 and the connecting rod 8. It is rotated clockwise in FIG. 1, and the presser foot 2 and presser foot 3 are raised against the action of the presser spring 6. To describe in more detail the movement of the knee pad 26 and the like at this time, when the knee pad 26 is pressed to the right by the worker's knee, first, the moving body 2
The left end of the through hole 24e of the bent portion 24c of No. 4 engages with the arm portion 20b of the rod 20. Since the knee rest 26 is still moved to the right, the knee rest 26 and moving body 24 are rotated clockwise by the gap between the through hole 24d and the rod 20 using the left end of the through hole 24e as a fulcrum. During this movement, the knee pad 26 is operated together with the rod 20 toward the operating position shown by the two-dot chain line in FIG. Rotating the knee pad 26 relative to the rod 20 is effective in maintaining a natural contact between the worker's knee and the knee pad 26 at all times.

Furthermore, during its operation, the knee rest 26 remains in contact with the worker's knee without any relative movement occurring between the two. The reason for this is that when the knee rest 26 is operated, a relative movement occurs between the movable body 24 and the rod 20 against the action of the coil spring 25.

Embodiments 2 to 4 (see FIGS. 4 to 8) These embodiments show only modifications of the portions of the first embodiment corresponding to FIG. Regarding the operating system, the explanation of the first embodiment will be referred to. Also, in FIGS. 4 to 8 showing the second to fourth embodiments, the same reference numerals are given to the same parts as in the first embodiment for explanation of the rod for the knee pad and its support structure. I will use Shiso's explanation.

The second embodiment will be described with reference to FIGS. 4 to 6. Reference numeral 31 denotes a support manufactured by pressing an iron plate, and has three bent portions 31a, 31b, and 31c. and two connecting parts 31
d, 34e, and these three bent parts 31
a, 31b, and 31c are the arm portions 20 of the rod 20;
b and is fixed onto the rod 20 by a set screw 32 screwed into the connecting portion 31d. A movable body 33 is slidably fitted onto the rod 20 between the bent portions 31b and 31c of the support body 31, and is normally urged downward by a coil spring 34. Further, as is clear from FIG. 6, the portion of the movable body 33 that faces the connecting portion 31e is formed with a gap between flat surfaces 35 that are substantially parallel to the plane of the connecting portion 31e. This serves to limit the rotation of the knee rest about the rod 20, which will be described later, to a certain range in any direction.

The support shaft 36 is inserted into the movable body 33 and fixed by a set screw 37. The rotating plate 38 is
It is formed by pressing a metal plate and consists of a disc-shaped part 38a and a pair of bent parts 38b cut and raised from the disc-shaped part 38. It is rotatably supported by both ends. Reference numeral 39 has exactly the same configuration as the knee rest 26 of the first embodiment, and is attached to cover the disk-shaped portion 38a.

Also in this second embodiment, when the knee rest 39 is operated, the knee rest 39 is moved around the support shaft 36 and the movable body 33 and the rod 20 are moved.
There is no relative movement between the worker's knee and the knee pad 39. Next, a third embodiment will be described with reference to FIG. 7. A movable body 41 is slidably fitted into the rod 20. The support body 42 is formed by pressing a metal plate, and consists of a disk-shaped portion 42a and a circular protrusion 42b that projects from the disk-shaped portion 42a. A through hole 42c is formed in 42b. The stepped screw 43 passes through the through hole 42c.
is screwed into the movable body 41. Of course, the diameter of the head of the step screw 43 is set larger than the diameter of the through hole 42c, thereby preventing the support body 42 from coming off. Moreover, the support body 42
The disk-shaped portion 42a is covered with a knee pad 44 having the same configuration as in the first embodiment. A coil spring 45 is disposed so as to surround the circular protrusion 42b and the movable body 41, and is stretched between the rod 20 and the disc-shaped portion 42a of the support body 42. This coil spring 45 is connected to the moving body 4
1 from coming off the rod 20.

In this third embodiment as well, when the knee rest 44 is operated, relative movement occurs between the movable body 41 and the rod 20 against the action of the coil spring 45, and the same function as in the previous embodiment is achieved.

Finally, a fourth embodiment will be described with reference to FIG. 8. A movable body 51 is slidably supported on the rod 20, and a support shaft 52
A support plate 53 is rotatably supported through the support plate 53, and a knee pad 54 is covered with the support plate 53. 55
is a coil spring disposed around the rod 20, the lower end of which is wound and fixed around the rod 20, and the upper end engaged with the lower end of the movable body 41 to urge the movable body 51 upward.

Also in this fourth embodiment, when the knee rest 54 is operated, rotation of the knee rest 54 and relative movement between the movable body 51 and the rod 20 occur.

Effects As detailed above, in the present invention, the upper end of a rod is rotatably supported around a horizontal axis on a support attached to a sewing machine table, and a movable body can be moved vertically on the rod. At the same time, the knee pad is attached to the movable body, and when the knee pad is operated, relative movement between the rod and the movable body is allowed, so the contact between the worker's knee and the knee pad is reduced. There is no relative movement between them,
The above-mentioned conventional deficiencies can be further improved.

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment; Figure 1 is an overall mechanical diagram, Figure 2 is an enlarged front view of the knee operating section showing the main parts in cross section, and Figure 3 is a front view showing the main parts in cross section. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2; 4 to 6 show the second embodiment, in which FIG. 4 is a front view equivalent to FIG. 2, FIG. 5 is a partial side view seen from the direction of line 5-5 in FIG. FIG. 6 is a sectional view taken along line 6-6 in FIG. 4. FIG. 7 is a drawing equivalent to FIG. 2 showing the third embodiment, and FIG. 8 is a drawing equivalent to FIG. 2 showing the fourth embodiment. FIG. 9 is an explanatory diagram showing the prior art. In the figure, 1 is the oil pan, 2 is the presser foot, 4 is the cloth presser foot, 6 is the cloth presser spring, 7 is the first bell crank lever, 8 is the connecting rod, 9 is the second bell crank lever, and 10 is the Knee raising bar, 12 is a support shaft, 14 is an operating lever, 15 is a mounting body, 19 is a coil spring,
20 is a rod, 22 is a collar, 24 is a moving object, 2
5 is a coil spring, 26 is a knee rest, 31 is a support body, 33 is a movable body, 34 is a coil spring, 36 is a support shaft, 38 is a rotating plate, 39 is a knee rest, 41 is a movable body, 42 is a support body , 44 is a knee rest, 45 is a coil spring, 51 is a moving body, 52 is a support shaft, 53 is a support plate, and 54 is a knee rest.

Claims (1)

[Claims for Utility Model Registration] A rod whose upper end is rotatably supported around a horizontal axis with respect to a support attached to a sewing machine table, and at least a portion of which extends vertically; A movable body movably inserted and supported, a knee rest attached to the movable body, and a biasing means that acts on the rod and biases the knee rest toward an inactive position, the knee rest comprising: A knee operation device for a sewing machine, characterized in that when the rod is operated by a worker's knee against the action of the urging means, relative movement between the rod and the movable body is allowed.