JPH049183A - Sewing machine presser foot device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a presser foot device for a sewing machine that is equipped with a plurality of presser feet and is capable of replacing the presser foot used depending on the sewing work.

[Prior Art] Conventionally, a plurality of presser feet are attached to the periphery of a presser foot support formed in a disc shape, and the center of the presser foot support is attached to a mounting member fixed to the tip of a presser bar. A presser foot device is known in which the presser foot support is rotated by a driving member such as a motor by rotatably pivoting, and the presser foot used in sewing work can be replaced (Japanese Patent Application Laid-open No. 62-
No. 204789).

[Problems to be Solved by the Invention] However, in the past, the drive member for rotating the presser foot support was attached to the main body of the presser foot device.
There was a problem in that the presser bar became heavy, and when the sewing machine was driven at high speed, the presser bar could not follow the vertical movement of the sewing machine needle, making it impossible to press the cloth properly. In addition, vibrations during sewing wear out the connecting parts between the drive device and the presser foot support, the electric wires that supply driving energy such as electricity to the drive device, and the life of the presser foot device is shortened. there were.

SUMMARY OF THE INVENTION Therefore, the present invention provides a cloth pressing device in which the presser foot can be replaced by rotationally driving the presser foot support by a driving member such as a motor, which can press the cloth well even when the sewing machine is running at high speed. In addition, this design is intended to prevent the connecting portion between the drive device and the presser foot support from being worn out due to vibrations during sewing.

[Means for Solving the Problems] That is, the present invention, which has been made to achieve the above object, comprises a presser bar that is attached to the arm of a sewing machine so as to be able to rise and fall; In a presser foot device for a sewing machine, which includes a presser foot support that can sequentially arrange a plurality of presser feet at presser foot positions, and a drive member that rotates the presser foot support, the drive member is connected to an arm of the sewing machine. The present invention is characterized in that it is attached to the presser foot support and further includes a driving force transmitting member that transmits the driving force of the driving member to the presser foot support when the presser bar is in the raised position. In the presser foot device of a sewing machine, the driving member is attached to the arm of the sewing machine, and the driving force of the driving member is transmitted through the power transmission member only when the presser foot is in the raised position, that is, when sewing is not performed. and transmits the information to the presser foot support.

This reduces the weight of the presser bar to which the presser foot support is attached, and also prevents vibrations generated in the presser bar during sewing from being directly transmitted to the drive member.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the arm 2 of the sewing machine 1 is provided with a presser foot 4 to which a cloth presser device 3 is attached, and a needle bar 6 to which a sewing machine needle 5 is attached, which can be raised and lowered. . The presser foot 4 is supported in the arm 2 so as to be movable up and down via a presser rod storage case 7 shown in FIG. At this time, the presser foot 8 provided on the presser foot device 3 is biased downward so as to press the work cloth placed on the bed 9 of the sewing machine 1 with a predetermined pressure.

As shown in FIG. 1, the presser foot device 3 includes a presser foot support 12 formed in a circular umbrella shape and having a plurality of protrusions 11 protruding from the outer wall for attaching the presser foot, and a presser foot support. The main part includes a mounting member 13 for rotatably supporting the presser foot 2 and for removably fixing the presser foot device 3 to the presser rod 4.

The attachment member 13 is formed in an umbrella shape like the presser foot support 12, and a hole 4 for fixing the presser foot support 2 is formed in the center thereof.

Further, a hole 15 having a larger diameter than the hole 14 is formed in the center of the presser foot support 12.
2 and the mounting member 13, and insert the step screw 16 into the hole 14.15.
The presser foot support 12 can be attached to the mounting member 13 by inserting the screw 16 through the screw 16 and tightening the nut 17.

On the other hand, the mounting member 13 has a plurality of protrusions 1 for attaching the presser foot by rotating the presser foot support 12, each of which is located on an extension line of the axis of the presser foot 4, and a presser foot 8 attached to the protrusion 11. A ball 19 is provided which fits into a recess formed in the presser foot support 12 when the presser foot is placed at the presser foot position. This ball 19 is connected to the nut [7] and the mounting member 1.
By the two leaf springs 20 and 21 fixed between 3 and 3,
The ball 19 is pressed against the presser foot support 12 side, and the ball 19 bites into the recess 18 due to this urging force, thereby firmly fixing the presser foot support 12.

As shown in FIG. 3, in this embodiment, the presser foot support 12
By attaching a different presser foot 8 to each protrusion 11 through a mounting screw 1au, the presser foot support 12 can be rotated to attach the presser foot used for sewing work. The foot 8 can be selected from three types of presser feet.

In addition, the outer leaf spring 2 of the two leaf springs 20 and 21 mentioned above
0 is the ball] From the presser position of 9, push it upwards,
It is formed larger than the inner leaf spring 21. On the other hand, on the arm 2 side, as shown in FIG. 2 or FIG.
An engaging protrusion 22 is fixed as a biasing force suppressing member that engages with the plate spring 20 to displace the leaf spring 20 in the direction of the arrow shown in FIG. Therefore, when the presser foot 3 is in the raised position,
That is, when the presser foot 8 does not perform the sewing operation from the cloth presser position, the urging force that urges the ball 19 toward the presser foot support 12 decreases, and the force of the ball 9 biting into the recess 18 decreases. As a result, the presser foot support 2 can be rotated with a small force.

Next, the presser foot support 1 is attached to the periphery of the presser foot support 1.
2 itself becomes a gear that rotates around the step screw 16,
Teeth 12a are formed, and when the presser bar 4 is in the raised position as shown in FIG. The presser foot support body] 2 can be rotated.

This gear 23 corresponds to the above-mentioned driving force transmission member, and receives the rotational force transmitted from the drive device 25 as a driving member attached to the arm 2 to presser foot support]
2 to rotate. The drive device 25 of this embodiment includes an air cylinder 27 that reciprocates a rod 26 using air pressure input from the outside, and a cam plate 28 that is rotated at a predetermined angle by the reciprocating movement of the rod 26. 2
By connecting the rotating shaft of 8 and the gear 23, the gear 2
It is designed to rotate 3.

As explained above, in this embodiment, the presser foot support 12
A drive device 25 for rotationally driving the presser foot support 12 is attached to the arm 2 side, and when the presser foot bar 4 is in the raised position, the drive device 25 and the presser foot support 12 are connected via the gear 23, and the presser foot support 12 is driven. The device 25 allows the presser foot support 12 to be driven in rotation. Therefore, according to this embodiment, the weight of the presser foot 4 can be reduced compared to the conventional device in which the drive device 25 is directly provided on the presser foot 4, and the presser foot can be used when the sewing machine is driven at high speed to perform sewing work. It becomes possible to perform the following effectively. Furthermore, during sewing when the presser foot bar 4 is placed in the lowered position, the drive device 25 and the presser foot support 2 are not separated.
Since the vibration from the presser bar 4 side is not transmitted to the drive device 25, this vibration is used to connect the drive device 25 and the presser foot support 12 and to supply air pressure to the drive device 25. It can prevent the phosphor from being worn out.

In this embodiment, the drive device 25 for rotating the presser foot support body 2 is composed of an air cylinder 27 and a cam plate 28, but a gear 23 is connected to the rotation shaft of the motor. The presser foot support 12 may be rotationally driven by the rotation.

[Effects of the Invention] As detailed above, according to the presser foot device for a sewing machine of the present invention, the weight of the presser foot bar can be reduced, and the presser foot can be used effectively when the sewing machine is driven at high speed to perform sewing work. It becomes possible to do so. In addition, during sewing, the drive member and presser foot support are separated (2) and vibrations from the presser bar side are not transmitted to the drive member, so energy is supplied to the connection between the drive member and presser foot support and to the drive member. It is possible to prevent the electric wires and the like used for this purpose from being worn out, and it is also possible to extend the life of the device.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing the configuration of a presser foot device according to an embodiment;
Figure 2 (a) is a front view of a sewing machine equipped with this presser foot device, Figure 2 (b) is a left side view of the same machine, and Figure 3 explains the presser foot attachment part of the presser foot support. The explanatory drawing, FIG. 4, is a partial sectional view showing the engaged state of the cloth presser device and the arm side member when the presser bar is in the raised position.

Claims (1)

[Scope of Claims] A presser foot that is attached to an arm of a sewing machine so as to be movable up and down, and a presser foot that is rotatably attached to the presser foot and that can be rotated to sequentially arrange a plurality of presser feet at the presser position. A presser foot device for a sewing machine, comprising: a support; and a drive member for rotating the presser foot support; the drive member is attached to an arm of the sewing machine; A presser foot device for a sewing machine, comprising a drive force transmitting member that transmits the drive force of the member to a presser foot support.