JPS6017548B2 - Sewing machine presser foot device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a presser foot device for a sewing machine, and particularly to a device that performs sewing while moving a presser foot holding a sewing cloth by a certain amount in a preset direction.

Generally, a sewing machine is equipped with a presser foot device to hold the sewing cloth and perform sewing, and the presser foot device of the sewing machine performs sewing while moving the presser foot holding the sewing cloth by a certain amount in a preset direction. A well-known device is a device in which a presser foot provided at the tip of a presser table is constantly urged downward by a spring, and when the presser foot is to be raised, the presser foot is raised by a cam or the like against the biasing force of the spring.

However, in the secondary presser foot device, the drag force against the spring of the presser foot is received by a presser foot with low rigidity, so when raising or lowering the presser foot, the presser foot has to be manipulated, and the sewing of the presser foot is affected. There was a drawback that good adhesion to cloth could not be obtained.

In addition, the presser foot installed at the tip of the presser foot is constantly urged downward with a strong pressing force of several k9 by a spring.
There was a drawback that the pressing force of the presser foot could not be adjusted.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a presser foot device for a sewing machine that can improve the adhesion of the presser foot to the sewing cloth and adjust the pressing force of the presser foot. Our goal is to provide the following.

In order to achieve the above object, the present invention provides a sewing machine that performs sewing by moving a cloth holding device holding a sewing cloth in parallel to the bed surface. a presser foot provided on the surface; a cloth presser foot that is attached to the tip of the presser foot so as to be slidable in the vertical direction and clamps the sewing cloth; a presser foot arm that is attached to the presser foot and slides the cloth presser foot in the vertical direction; A presser body is attached to the sewing machine arm so as to be movable in the vertical direction, and has a sliding part at the lower end having a width corresponding to the plane of movement of the presser foot, and a presser body is attached to the presser foot arm so as to be movable in the vertical direction. A presser foot shaft that engages with the presser foot and whose upper end moves against the sliding portion of the presser foot, and a presser foot shaft that is attached to a sewing machine arm and presses the presser foot downward to press the presser foot toward the bed surface. It is characterized in that it includes a solenoid that biases the presser foot, and an elastic body that is provided on the presser foot and constantly biases the presser foot upward.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment of the cloth feeding device for a sewing machine according to the present invention. A solenoid 18 is fixed to press and bias the solenoid 18 toward the plunger 16, and the solenoid 18 is composed of a plunger portion 20 and a link 24 rotatably connected to one end of the plunger portion 20 with a pin 22. . One end of the link 24 is rotatably connected to one end of a lever 28 by a pin 26, and the above-mentioned bar 28 is rotatably connected to the sewing machine arm--shaft 3 fixed to the shaft. A presser body 32, which will be described later, moves in the vertical direction. A shaft portion 32a of the presser foot 32 is provided on the bearing portion 10a of the lower part of the sewing machine arm 10 so as to be movable in the vertical direction, and one end of the shaft portion 32a is pivoted to one end of the lever 28 with a pin 34 so as to be freely rotatable. has been done.

A locking pin 36 is screwed to the lower part of the sewing machine arm 10, and the tip of the locking pin 36 is connected to the presser foot 32.
The sliding portion 32 of the presser foot 32 is configured to move vertically.
b, and the locking pin 36 is inserted into the presser body 32.
The presser body 32 is locked so that it does not rotate about the shaft portion 32a. On the other hand, a cloth holding device 37 is provided on the bed surface 16 in order to perform sewing by holding the sewing cloth and moving it parallel to the bed surface 16.The device 37 is constructed as follows. . That is, a cloth presser foot 14 that holds the sewing cloth is attached to the tip of the presser foot 38 so as to be slidable in the vertical direction. Further, the presser foot 38 is provided with the presser foot 14.
A presser arm 40 is provided to move the presser in the vertical direction, and the presser arm 40 is connected to a shaft 42 fixed to the presser base 38
It is constantly pressed upward by a spring 44 attached to. The presser body 32 is located at the center of the presser stand 38.
In order to transmit the vertical movement of the presser arm 40 to the presser arm 40, a presser shaft 46 is penetrated so as to be movable in the vertical direction.

A washer 48 is fixed to the upper part of the presser foot shaft 46, and the presser foot 38 is configured to be able to move in the horizontal direction by sliding this washer 48 and the sliding portion 32b of the presser foot 32. . On the other hand, a spring presser 50 is attached to the lower part of the presser shaft 46 with a pin 48, and the spring presser 50 presses the presser arm 40 downward by the suction action of the solenoid 18. At the bottom of the presser foot 38, there is a presser foot lower plate 52 that cooperates with the presser foot 14 to clamp the sewing cloth.
is fixed by a fixing screw 54. In order to move the cloth holding machine 37 having the presser foot 14 described above in the X-axis and Y-axis directions, an x-axis cloth feeding device 58,
A y-axis cloth feed device 60 is provided in the sewing machine arm 10, and each cloth feed device 58, 60 is configured as follows.

That is, as shown in FIG.
A pulley 66 is connected to the fixed x-axis driving pulse motor 62 via a coupling 64, and a pulley 66 is connected to the pulse motor 62 at a constant distance from the pulley 66.
A toothed belt 70 is placed between the pulley 66 and the pulley 66 .

On the toothed belt 70, an x track rail portion 72 is provided for moving the cloth holding device 37 having the aforementioned presser foot 14 in the x axis direction. This x separation rail portion 72 is attached via a bearing (not shown) to a V-shaped groove 76a of the x-mari test rail 76 fixed to the bed 56 with a fixing screw 74 and the x-axis fixing rail 76. It is comprised of a movable plate 80 fixed on the toothed belt 70 with a fixing fitting 78 and movable in the x-axis direction. On the other hand, the Y-mari cloth feeding device 60 is configured as follows.

That is, a pulley 86 is connected via a coupling 84 to a Y-axis drive pulse motor 82 which is fixed perpendicularly to the X-axis drive pulse motor 62 on one side of the sewing machine arm. A toothed belt 90 is stretched between the boley 88 and the pulley 86 which are arranged at a constant interval.

A belt stand 94 is fixed to the lower part of the toothed belt 90 with a fixing metal fitting 92, and a transmission shaft 98 is fixed to this belt stand 94 with a fixing screw 96. Transmission shaft 98
A shaft 102 fixed to a bearing 100 is attached to the tip of the bearing 100 so as to be movable in the X-axis direction.
is fixed. Further, a circular axis rail section 104 is provided on the upper part of the X-axis rail section 72 so as to be perpendicular to the rail section 72, and the rail section 104 is connected to the movable plate 8 of the X-axis rail section 72.
A Y-axis fixing rail 108 fixed with a fixing screw 106 perpendicular to the Y-axis fixing rail 108 and a V-shaped groove 106 of the Y-axis fixing rail 108.
A movable plate 110 is attached to a via a bearing. Movable plate 1 of Y-axis rail section 104
A cloth holding device 37 having the cloth presser foot 14 is fixed on the cloth holding device 10 with a fixing screw 54, and the cloth holding device 37 is moved in each axis direction by the above-mentioned X-axis and Y-axis cloth feeding devices 58 and 60. The sewing machine 110 has a needle 112, and works in cooperation with a needle bar 114 which is fixed to a sewing machine arm so as to be movable in the vertical direction to sew the product.

The presser foot device for a sewing machine according to the present invention has the above configuration, and its operation will be explained below.

When starting sewing work, first place the sewing cloth under the presser foot 14, and then suck the solenoid 18 against the biasing force of the spring 44. Since it is pressed downward, presser arm 4 and axis 4
It is rotated downward using 2 as a fulcrum.

Therefore, the presser foot 14 is pressed downward by the rotation of the presser arm 40, so that the sewing cloth is held between the presser foot 14 and the lower presser 52. In this case, the resistance force of the presser foot 14 against the spring 44 is received by the highly rigid sewing machine arm 10 via the presser foot 32, and as seen in the conventional device, the presser foot 38 moves up and down as the presser foot 14 is raised and lowered. There is no force at all to raise or lower the tip of the
The presser foot 38 does not fall off, and the adhesion of the presser foot 22 to the sewing cloth can be maintained well. The pressing force of the presser foot 14 can be easily adjusted by adjusting the current value supplied to the solenoid 18 and changing the suction force of the plunger portion 20.

The pressing force of the presser foot 14 can also be adjusted using the solenoid mounting plate 12.
This can also be done by changing the mounting position of the solenoid 18 and changing the gap between the plunger portion 20 of the solenoid 18 and the bottom portion 18a of the solenoid 18. Next, the cloth holding device 37 is moved in each axis direction from the X-axis and Y-axis cloth feeding devices 58, 601 according to drive information stored in a storage element (not shown), and the needle comb 114 having the needle 112 is moved. The sewing cloth is sewn by driving the sewing machine in the vertical direction.

After sewing is completed, the power supply to the solenoid 18 is stopped to release the suction action of the solenoid 18, and the presser foot arm 40 is rotated upward by the biasing force of the spring 44, so that the presser foot 14 is moved upwardly. It is pushed up and the sewing cloth can be taken out. In this way, when pushing the presser foot upwards, all you need to do is turn off the power to the solenoid.
It is easy to operate, and since there is no need to provide a separate solenoid for pushing up the presser foot, power consumption can be reduced. As described above, according to the present invention, the resistance force against the spring of the presser foot is received by the highly rigid sewing machine arm, so that the presser foot can maintain good adhesion to the sewing fabric without having to manipulate the presser foot. can be kept.

Further, according to the present invention, the pressing force of the presser foot can be easily adjusted by adjusting the current applied to the solenoid or changing the fixing position of the solenoid.

Further, the operation of raising the presser foot can be performed by stopping the energization to the solenoid and using the biasing force of the spring, so the operation is simple and power consumption can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutout explanatory diagram showing a preferred embodiment of the presser foot device for a sewing machine according to the present invention, and FIG. 2 is a diagram showing the X-axis and Y-axis of the presser foot device for a sewing machine according to the present invention. FIG. 2 is a configuration diagram of a cloth feeding device.

The same members in each figure are given the same reference numerals: 10 is the sewing machine arm, 14 is the cloth presser foot, 16 is the bed surface, 18 is the solenoid, 32 is the presser foot, 37 is the cloth holding device, and 38 is the presser foot. , 4
0 is a presser arm, 44 is a spring, and 46 is a presser shaft. No. 14 Book 2

Claims (1)

[Claims] 1. In a sewing machine that performs sewing by moving a cloth holding device that holds the sewing cloth in parallel to the bed surface, a presser foot and a presser foot are provided on the bed surface so as to be able to move in two axes parallel to the bed surface. A presser foot that is attached to the tip of the presser foot so as to be slidable in the vertical direction and clamps the sewing cloth; a presser foot arm that is attached to the presser foot base and that slides the presser foot in the vertical direction; and a presser foot that is attached to the sewing machine arm so as to be movable in the vertical direction. , a presser body having a sliding portion having a width corresponding to the moving plane of the presser foot at the lower end; a presser foot that penetrates the presser foot so as to be movable in the vertical direction, the lower end engages with the presser arm, and the upper end slides on the presser foot; a presser foot shaft that slides on the presser foot; a solenoid that is attached to the sewing machine arm and presses the presser foot downward to press the presser foot toward the bed surface; A presser foot device for a sewing machine, comprising: an elastic body that constantly urges the presser foot upward.