JPH0739668A - Looper drive - Google Patents

Abstract

(57) [Abstract] [Purpose] In a looper device, the rocker 12 and the looper stand 20 can be reliably connected to each other with excellent durability, and the rocker 12 and the looper stand 20 can be connected and disconnected. Can be operated easily. With the engagement body 32 engaged with the engagement hole 16, when the rocking body 12 rocks, the looper base 20 rocks through the engagement body 32. In addition, the engaging body 32 moves in the axial direction while rotating around the axis of the standing shaft to move the engaging body 2
When 0 is disengaged from the engagement hole 16, only the oscillating body 12 oscillates, the transmission of the looper base 20 is interrupted, and the oscillating motion is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a looper drive device, and more particularly to a looper drive device capable of interrupting the drive of the looper.

[0002]

2. Description of the Related Art Conventionally, as a looper drive device capable of cutting off the drive of the looper, a utility model Sho 58-2310.
The device described in the publication is known. The device includes an oscillating body having a shallow fitting groove and fixed to a drive shaft, a transmission body (a looper base) having a shallow fitting groove and rotatably provided with respect to the drive shaft, and each fitting groove. And a lock body provided on the drive shaft so as to be movable in the axial direction. Further, the looper is configured to be driven when the projecting piece engages with the fitting grooves of both the rocking body and the transmission body.

Further, the above-mentioned conventional device is provided with a male thread on the lock body and a female thread on the operation dial, and is configured to move the lock body in the axial direction by rotating the operation dial. .

[0004]

However, in the conventional device, the slender rod-like projecting piece engages with the shallow fitting groove to connect the rocking body and the transmitting body, so that the projecting body is struck by vibration of the sewing machine or the like. There is a problem that the piece is easily broken and the projecting piece is bent and easily comes off the fitting groove.

Further, in the conventional device, since the operation dial and the lock body are screwed together, the lock body is moved in order to connect or disconnect the rocking body and the transmission body. Has a problem that the operability is poor because the operation dial needs to be rotated many times.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to have excellent durability and to reliably connect an oscillating body and a looper base. It is an object of the present invention to provide a looper drive device having excellent operability in connecting and disconnecting a looper base with a looper base.

[0007]

In order to achieve this object, a looper drive device according to claim 1 of the present invention comprises a rocker connected to a drive shaft and constantly rocking, and a rocker having a looper and the rocker. The rocker base that is swingably supported in one direction, the engagement hole that is formed in either the rocking body or the looper base, and the swing hole that is formed narrower than the width of the engagement hole. An open portion formed so as to extend in the moving direction, and a standing shaft that is formed narrower than the width of the open portion and that is provided at the other of the oscillating body and the looper base so as to extend toward the engagement hole. And an engaging body that is formed to have a width substantially the same as the width of the engaging hole and that is provided on the standing shaft so as to be movable in the axial direction thereof.

The looper drive device according to a second aspect of the present invention includes a protruding pin formed on the upright shaft and the engaging body that is inclined with respect to the moving direction of the engaging body to guide the protruding pin. Further provided with a guide groove.

[0009]

In the looper drive device according to the first aspect of the present invention having the above-described structure, when the rocking body swings while the engaging body is engaged with the engaging hole, the looper stand swings through the engaging body. When the engaging body is moved and the engaging body is disengaged from the engaging hole, only the oscillating body oscillates, and the transmission of the looper base is interrupted to stop the oscillating movement.

Further, in the looper drive device according to the second aspect, when the engaging body rotates about the axis of the standing shaft, the engaging body moves in the axial direction to engage or disengage with the engaging hole.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a looper drive device of this embodiment, in which a drive shaft 10 is constructed to be rotated by a drive source (not shown). And the drive shaft 10
An oscillating body 12 is fixed to the oscillating body 12, and the oscillating body 12 is configured to oscillate as the drive shaft 10 rotates. Rocker 1
A circular engaging hole 16 for engaging with an engaging body 32, which will be described later, is formed in the hole 2. Further, the rocking body 12 is provided with an opening portion 18 that extends along the rocking direction of the rocking body 12 in order to open the upper portion of the engagement hole 16 to the outside.

A looper base 20 is swingably attached to the drive shaft 10. A looper shaft 22 is rotatably attached to the tip of the looper base 20, and the looper shaft 22 is configured to slide on a shaft base 24 rotatably provided on a sewing machine frame (not shown). Has been done. Further, a looper 26 is attached to the tip of the looper shaft 22. Then, when the looper 26 is driven, it is configured to cooperate with an unillustrated sewing needle to form an overlock stitch on the fabric.

At the rear end of the looper base 20, a rocker 12 is provided.
A standing shaft 28 is erected toward (see FIG. 3).
The diameter of the standing shaft 28 is smaller than the width of the open portion 18 of the rocking body 12. The standing shaft 28 is provided with a protruding pin 30 so as to be orthogonal to the axial direction of the standing shaft 28. In addition, a cylindrical engagement body 32, which is inserted into the engagement hole 16 and engaged with the upright shaft 28, is attached so as to be rotatable and movable in the axial direction. The engaging body 32 has a tapered tip end portion formed to have a diameter substantially the same as the width of the engaging hole 16 so that the engaging body 32 can be easily inserted into the engaging hole 16, and the opening portion is formed so as not to slip out from the opening portion 18. It has a diameter larger than the width of 18.

Further, the engaging body 32 is inserted into the engaging hole 16 and the engaging body 3
A guide groove 34 for guiding the projecting pin 30 is provided on the second member 2 so as to extend by an amount of about a quarter of the circumference of the engagement body 32 (see FIG. 4). The guide groove 34 includes an inclined portion 34a that is inclined with respect to the circumferential direction of the engaging body 32 and a horizontal portion 34b that is parallel to the circumferential direction. Furthermore,
An operation body 36 for operating the engagement body 32 is provided at the rear end portion of the engagement body 32. Therefore, when the operating body 36 is operated to rotate the engaging body 32, the projecting pin 30 is guided in the guide groove 34, whereby the engaging body 32 moves in the axial direction.

Further, a stopper pin 38 for preventing the engaging body 32 from coming off is provided at the tip of the standing shaft 28, and
The engagement body 32 is provided between the engagement body 32 and the retaining pin 38.
A spring 40 is provided for urging the spring toward the engagement hole 16.

Next, the operation of this embodiment will be described.

First, as shown in FIG. 1, when the sewing machine is driven while the engagement body 32 is engaged with the engagement hole 16, the drive shaft 10 rotates and the rocking body 12 rocks. Then, the rocking of the rocking body 12 is caused by the engagement body 32 engaged with the engagement hole 16.
Is transmitted to the erected shaft 28 and the looper table 20 via the looper, and the rocker 26 is driven by the swing of the looper table 20 to form an edge stitch.

Next, the operator operates the operating body 36 to move the operation shown in FIG.
When the engaging body 34 is rotated clockwise by 90 degrees as shown in FIG. 3, the action of the protruding pin 30 and the guide groove 34 causes the engaging body 3 to rotate.
4 comes out from the engaging hole 16 and comes off. Further, in this state, the protruding pin 30 has the horizontal portion 34 b of the guide groove 34.
Since the engaging member 32 is located at, the engaging member 32 is stable without moving to the engaging groove 16 by the urging force of the spring 40.

Even if the rocking body 12 is rocked by driving the sewing machine in this state, the open portion 18 slips through the standing shaft 28 as shown in FIG. 3, so that the rocking body 12 rocks. Not transmitted to. Therefore, the looper 26 is also not driven, and a double chain stitch without using the looper 26 is formed.

Further, in order to drive the looper 26, it is rotated counterclockwise by 90 degrees so that the engaging body 32 is engaged with the engaging hole 1.
6 may be fitted.

Thus, in this embodiment, the engaging body 3
Since the looper 26 can be driven or released by simply rotating the loop 2 by 90 degrees, the operation thereof is simple, and the structure is simple, and the tubular engagement body 32 is pushed into the engagement hole 18 and the looper 26 is pushed. Since the base and the rocking base 12 are connected, the durability is excellent and the connection can be surely performed.

[0023]

As is apparent from the above description, in the looper drive device of the present invention, the rocker and the looper base can be reliably connected to each other with excellent durability, and the rocker and the looper can be reliably connected. Excellent operability in connecting and disconnecting from the base.

[Brief description of drawings]

FIG. 1 is a perspective view showing a looper drive device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which an engagement body is rotated in the device.

FIG. 3 is a perspective view showing a state in which only an oscillating body is oscillated in the above apparatus.

FIG. 4 is an explanatory view showing a state in which a main part of the apparatus is disassembled.

[Explanation of symbols]

 12 rocker 16 engaging hole 18 open part 20 looper stand 26 looper 28 standing shaft 30 projecting pin 32 engaging body 34 guide groove

Claims (2)

[Claims] 1. A looper drive device for driving a looper, comprising: an oscillating body which is connected to a drive shaft and which oscillates at all times; and a looper base which has the looper and is oscillatably supported in the same direction as the oscillating body. An engaging hole formed in either one of the oscillating body and the looper base, and formed to be narrower than the width of the engaging hole and extending from the engaging hole in the oscillating direction. And a standing shaft that is formed narrower than the width of the opening and that is provided on the other of the rocking body and the looper base so as to extend toward the engaging hole, and the engaging hole. An engaging body that is formed to have a width substantially the same as that of the rocking body and is provided on the upright shaft so as to be movable in the axial direction thereof. The swing is transmitted to the looper base, and the engagement body Looper driving apparatus characterized by blocking its transmission in the state detached from Goana. 2. A projection pin formed on the upright shaft, and a guide groove formed on the engagement body so as to be inclined with respect to the moving direction of the engagement body to guide the projection pin, The looper drive device according to claim 1, wherein the engagement body moves in the axial direction of the engagement body when the engagement body rotates about the axis of the standing shaft.