JP2591117Y2 - Sewing machine presser foot device - Google Patents

Description

[Detailed description of the invention]

[0001]

In this invention, a cloth placed on a needle plate is pressed in the vicinity of a needle drop position by a cloth pressing member biased by a spring, and the cloth pressing member is pressed against the spring. The present invention relates to a cloth presser that can be raised as needed.

[0002]

2. Description of the Related Art Conventionally, a sewing machine is provided with a cloth presser as shown in FIG. In the figure, reference numeral 1 denotes a presser bar which is held up and down by a presser bar metal Ma provided at the end of the sewing machine arm M1, and a lower end portion of which holds a cloth placed on the sewing machine bed M2 at a needle drop position. The cloth presser member 2 to be pressed in the vicinity is fixed. Reference numeral 3 denotes a holding spring. The presser spring 3 is interposed between a presser adjusting screw 4 provided at the upper end of the sewing machine arm M1 and the presser bar 1. The presser bar 1 is urged downward by the spring 3, and the cloth presser member 2 In this manner, the cloth is engaged with the feed dog to convey the cloth, and the cloth is prevented from fluttering due to the elevation of the sewing needle.

[0003] This type of presser foot device is usually provided with a presser lifting mechanism having the following structure.
Thereby, when setting or taking out the cloth, the cloth pressing member 2 can be raised as appropriate. In FIG. 4, reference numeral 5 denotes a knee rest lever (pressing operation lever) provided on the lower surface of the sewing machine bed, and when the worker presses the knee rest part 5 a with the knee, the horizontal axis 7 is attached via the mounting arm 6. Is rotated, and the rotation arm 8 is rotated upward with the rotation. When the knee rest lever 5 is released, the horizontal axis 7 returns to the initial position by the winding spring 9, and accordingly, the knee rest lever 5 and the rotating arm 8 also return to the initial positions. The lower end of a push-up rod 10 inserted into an oil pan MO disposed below the sewing machine table T is in contact with the upper surface of the rotating arm 8 so that the lower end of the push-up rod 10 moves up and down as the rotating arm 8 moves up and down. It has become.

On the other hand, an L-shaped rotating link 12 is rotatably supported by a support shaft 12a in the base of the sewing machine arm M1, and one end thereof is opposed to the lid 10a of the push-up rod 10. Connecting shaft 11 is connected. By raising and lowering the push-up bar 10 and raising and lowering the connecting shaft 11, the rotating link 12 rotates around the support shaft 12a.

[0005] In addition, the front of the sewing machine arm M1
A lifting link 14 having a character shape is rotatably mounted on a fulcrum shaft 14a. This raising link 1
One end of 4 is connected to the other end of the rotation link 12 by a horizontal bar 13, and rotates in conjunction with the rotation link 12. Further, a lifting plate 15 is mounted on the other end of the lifting link 14. The lifting plate 15 has a contact portion 15a facing a lower surface of a holding bar holding member (locking member) 1a provided at an upper end portion of the holding bar 1, and the lifting link 14 moves in the direction of arrow A. As a result, the contact portion 15a comes into contact with the lower surface of the presser bar holder 1a and pushes it up, and the presser bar 1 is raised against the presser spring 3.

As described above, in the press-up mechanism, by pushing and releasing the knee rest 5a of the knee rest lever 5, the push-up rod 10 and the connecting shaft 11 are raised and lowered, and
5 is operated to move the presser bar 1 up and down. Also, the knee rest lever 5 as described above is used.
In addition to the lifting operation by the knee rest 5a, the lifting mechanism shown in FIG.
6 can also be performed.
That is, the manual lever 16 is rotatably supported outside the sewing machine arm M <b> 1 by the rotating shaft 17, and by rotating the lever 16 in the C direction, the pressing lever fixed to the rotating shaft 17 is held. The raising cam 18 rotates in the same direction to press the end face of the lifting link 14, and rotates the link 14 in the A direction to raise the lifting plate 15.

[0007]

As described above, in the above-mentioned cloth presser, the presser bar 1 can be raised from the lowered position by the knee rest 5a of the knee rest lever 5 and the manual lever 16. However, when the presser bar 1 is raised, a sliding sound is generated between the presser bar 1 and the presser bar metal Ma, and a chattering sound is generated in the linking means, which gives a worker an unpleasant feeling. There was a problem. This noise is caused by (a) unevenness in contact between the two members due to the clearance formed between the presser bar 1 and the presser bar metal Ma and the moment generated in the presser bar, and the presser bar 1 and the presser bar metal The sliding frictional resistance generated between Ma and Ma becomes unstable, so that the presser bar does not rise smoothly and generates minute vibrations. Factors such as the fact that minute gaps are set and that the linking means in the linking means are long and that each member itself is also easily excited are generated.

Accordingly, the presser bar 1 or the presser bar metal Ma
Apply a large amount of lubricant to the presser bar 1 and presser bar metal M
If the sliding friction resistance between the sliding arm and the a is reduced, the above-described sliding noise can be prevented and the noise can be reduced, but the presser bar 1 is exposed from the sewing machine arm M1, Because it is located very close to the cloth, if a large amount of lubricant is applied to such a member, there is a risk that the cloth will be stained by the lubricant, and it is practically impossible to reduce noise using a lubricant. It was possible.

The present invention has been made in view of the above problems, and has as its object to provide a presser lifting device which can raise a cloth presser member without generating frictional noise.

[0010]

According to the present invention, a cloth holding member (2) which is slidably supported in a vertical direction by a sewing machine arm and presses a cloth to be sewn is provided at a lower end, and the elasticity of a pressing spring is always provided. a presser bar (1) in the lowered position by the force, the oil pan disposed below a sewing machine table, is movable up and down
A connecting shaft (11) having a free end in contact with the upper surface of the push-up bar (10), a presser-lifting operating lever (5) connected to the lower end of the push-up bar, and moving the push-up bar up and down; in conjunction with the action of the lever, to move upward from the lowered position to the presser bar (1), linkage means for connecting the connecting shaft and the presser bar (15,14,13,12)
And one end is rotatably supported by the sewing machine frame and the other end is
Pressure plate which always elastically pressed against the movable part of the serial connection means (2
0).

[0011]

In the present invention, since the pressure contact plate is always elastically pressed against the movable portion of the linking means for raising and lowering the presser bar holding member (locking member), the presser is interlocked with the operation of the presser lifting operation lever. Even if a minute vibration generated at the contact portion between the rod and the presser bar metal is transmitted to the linking means, the vibration is suppressed by the constantly light pressing force of the pressing plate, and the vibration noise in the linking means is reduced. Further, as a result of the reduction in the vibration in the linking means, the vibration generated between the presser bar and the presser bar metal interlocking with the linking means is also reduced, and the sliding friction noise generated here is greatly reduced. It does not give any discomfort.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. The same or corresponding parts as those of the above-described conventional technology are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 1, reference numeral 20 denotes a press-contact plate rotatably supported by a fulcrum shaft 21 in a sewing machine arm, and one surface of the press-contact plate can contact the upper end of the lifting link 14. Also, 2
Reference numeral 2 denotes a helical spring inserted through the fulcrum shaft 21, one end of which is locked to the sewing machine frame and the other end of which is locked to the press-contact plate 20. )
To give the biasing force. For this reason, one surface of the pressure contact plate 20 is always elastically pressed against the upper end of the lifting link 14. In addition, other configurations are the same as those shown in the above-described related art, and the overlapping description will be omitted.

As described above, in this embodiment, the pressure contact plate 20 is constantly pressed against the lifting link 14 (for example, 50 to 50).
100g is particularly good), so the knee rest lever 5
Even when the presser bar is raised by the knee pad 5a or the like, the frictional sliding noise generated between the presser bar and the presser bar metal and the vibration noise generated in the linking means can be significantly reduced. .

That is, also in this embodiment, a non-uniform sliding frictional force is generated between the presser bar 1 and the presser bar metal Ma due to the clearance between the two members and the moment generated in the presser bar. A minute gap is set in each connecting portion, and a slight vibration is applied to the lever 5 or 16 regardless of how smoothly the operator intends to operate the lever.
This is the same as the conventional one. However, in this embodiment, since the pressure contact plate 20 elastically abuts on the pulling link 14 which is one movable member of the linking means, and the elastic force prevents the fine vibration of the pulling link 14, it is connected to this. The vibrations of the other members (the lifting plate 15, the knee-raising horizontal bar 13, and the rotating link 12) are also suppressed, and the chattering of the vibration noise from the linking means is eliminated.

Further, since the vibration of the linking means is suppressed, the vibration of the pressing rod 1 interlocking with the linking means is also suppressed via the linking means, so that the pressing rod 1 and the pressing rod metal Ma are interposed. The generated sliding friction noise is also greatly reduced. Thus, in the actual work, the presser can be lifted with almost no sound, and the operator can comfortably perform the presser work without being bothered by unpleasant noise.

In the above embodiment, the case where the pressure contact plate 20 is brought into contact with the upper end portion of the lifting link 14 has been described as an example, but the pressure contact plate 20 is brought into contact with a portion other than the upper end portion. Also, the member to be brought into contact may be brought into contact with other members (lifting plate 15, knee-raising horizontal bar 13, rotating link 12) or the like constituting the linking means. Is not particularly limited to one.

In addition to the above embodiment, as shown in FIG.
The same effect can be obtained by pressing the pressing plate 20 against the protrusion 24 by punching the lifting link 14 with a press or the like as shown in FIG. .

Further, as a member for urging the pressure contact plate 20, a coil spring, a plate spring, or the like can be used, and an elastic member is used for the pressure contact plate itself, and this is used as a cantilever spring. The present invention is not particularly limited to the above embodiment.

[0019]

[Effects of the Invention] As described above, the presser foot device according to the present invention includes the movable portion of the linking means for raising the presser bar.
Since the press-contact plate is elastically pressed, the noise when the presser bar is raised can be greatly reduced, and the press-up operation can be performed comfortably.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a main part showing an embodiment of the present invention.

FIG. 2 is an enlarged front view of a main part showing another embodiment of the present invention.

FIG. 3 is an enlarged front view of a main part showing still another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional cloth presser.

[Explanation of symbols]

 M1 sewing machine arm M2 sewing machine bed 1 presser bar 2 cloth presser member 3 presser spring 5 knee rest lever (pressing operation lever) 12 rotation link 13 knee raising horizontal bar 14 pulling link 15 lifting plate 16 manual lever (pressing operation lever) 20 Pressure plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A presser bar, which is slidably supported by a sewing machine arm in a vertical direction, has a cloth presser member (2) at its lower end for pressing a cloth to be sewn, and is always at a lowered position by the elastic force of a presser spring. (1) a connecting shaft (11) having a free end abutting on the upper surface of a push-up bar (10) supported movably up and down on an oil pan disposed below the sewing machine table; , a presser foot lifting lever to perform vertical movement of the push-up rod (5), in conjunction with the action of the presser raising operation lever, to move upward from the lowered position to the presser bar (1), said press <br Linking means (15, 14, 1) for connecting the rod and the connecting shaft.
3, 12) and a pressure contact plate (20) one end of which is rotatably supported by the sewing machine frame and the other end of which is always elastically pressed against the movable portion of the linking means.
And a presser foot device for a sewing machine.