JP2003169983A - Looper thread filature device for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a looper thread filature device by which a looper thread filature can be easily returned to its reference position when the looper thread filature for adjusting the filature and tightening of looper thread is removed or displaced. <P>SOLUTION: The looper thread filature 3 is set in its optimum position under standard sewing conditions and is fixed to a rotating shaft 5 with screws 14. Then a notch 4a of a rotating member 4 is aligned with a notch 3a of the looper thread filature 3, and the rotating member 4 is fixed to the end 5a of the rotating shaft 5 with a screw 8. If the looper thread filature 3 is removed or displaced after that, it is returned to its reference position by adjusting the position of the looper thread filature 3 in such a way that the notch 3a of the looper thread filature 3 is aligned with the notch 4a of the rotating member 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a looper thread take-up device for controlling a looper thread guided to a looper which swings in synchronization with vertical movement of a sewing needle, such as a double chain stitch sewing machine.

[0002]

2. Description of the Related Art As a looper thread take-up device of this type, as disclosed in Japanese Patent Laid-Open No. 6-154456, a looper thread take-up is provided on a rotary shaft that rotates in synchronization with vertical movement of a sewing needle and swing of the looper. A configuration in which a (looper thread control cam) and a rotary member are inserted so as to be engageable with each other has been conventionally known. The looper thread take-up and the rotary member are fixed by the fixing member after being adjusted to the optimum mounting positions. Then, when the looper thread reel is removed for reasons such as winding of the looper thread, by engaging the engaging means of the rotating member with that of the looper thread reel,
The looper thread reel can be easily restored to the original mounting position.

[0003]

However, the optimum mounting position of the looper thread reel is different depending on the sewing conditions, particularly the expansion and contraction degree of the looper thread. Therefore, the manufacturer of the double-ring sewing machine uses the looper thread having a medium degree of expansion and contraction as a standard sewing condition, determines the attachment position (reference position) of the looper thread take-up, and then ships.

On the other hand, the sewn person adjusts the mounting position (adjustment position) of the looper thread reel according to each sewing condition. The adjustment to the adjustment position is generally performed using the above-mentioned reference position as a guide.

However, in the above-mentioned conventional technique, there is a problem that the reference position cannot be known once the looper thread reeling and rotating member is once moved from the reference position. For this reason, the sewer must spend a great deal of time to determine the adjustment position each time the sewing conditions change, greatly impairing work efficiency.

The present invention has been made in view of such circumstances, and even when the mounting position of the looper thread reel is changed or the looper thread reel is removed, the looper thread reel can be easily restored to the mounting reference position. An object is to provide a looper thread reeling device.

[0007]

The invention according to claim 1 of the present application is as follows.
A sewing needle that moves up and down, a looper that swings in synchronization with the vertical movement of the sewing needle, a rotary shaft that rotates in synchronization with the vertical movement of the sewing needle, and a looper that is rotatably fitted and inserted into the rotation shaft. A looper thread take-up device for a sewing machine, comprising a looper thread take-up for controlling a guided looper thread, comprising: a rotary member rotatably attached to the rotary shaft; and a fixing member fixing the rotary member. A signature is provided on each of the thread reel and the rotating member.

According to a second aspect of the present invention, in the looper thread winding device, a plurality of the rotating members are provided.

According to a third aspect of the present invention, in the looper thread reeling device, the rotary member is provided with a scale.

[0010]

According to the present invention, the reference position of the looper thread take-up is determined and fixed under the standard sewing condition, and then the rotary member is fixed by matching the mark of the rotary member with the mark of the looper thread take-up. As a result, even when the mounting position of the looper thread reel is changed or the looper thread reel is removed, it is possible to easily restore the looper thread reel to the reference position by the instruction of the sign of the rotating member. Further, if the rotary member is provided with a scale or a plurality of the rotary members are provided, not only the reference position but also the adjustment position can be easily restored.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a looper yarn winding device according to the present invention. The needle bar 15 is vertically movable on a sewing machine arm (not shown). The sewing needle 1 is attached to the needle bar 15 via a needle anchor 16. The looper bar 18 is swingably supported by a bush 19 fixed to a sewing machine bed (not shown). The looper 2 is attached to the looper bar 18 via a looper retainer 17. The vertical movement of the sewing needle 1 and the swinging of the looper 2 are performed in synchronization with each other, and the needle thread 11 and the looper thread 12 are engaged with each other to form a double chain stitch seam.

The rotating shaft 5 is supported by a bush 10 fixed to a sewing machine bed (not shown), and rotates around the shaft in synchronization with the vertical movement of the sewing needle 1 and the swing of the looper 2. The looper thread reel 3 is rotatably inserted in the rotary shaft 5 and is fixed by a screw 14. As shown in FIG. 2, the looper thread reel 3 is composed of an asymmetrical cam portion 3b and a cylindrical mounting portion 3c, and the mounting portion 3c is provided with a notch portion 3a serving as a seal. The rotating member 4 has a disc shape with a hole 4b formed in the center thereof, and a notch portion 4a serving as a mark is provided at an end edge thereof. The outer diameter of the rotating member 4 is substantially the same as that of the rotating shaft, and is fixed to the end surface 5a of the rotating shaft 5 with a screw 8.

The looper thread 12 is supplied from a looper thread feeder (not shown) and attached to the bracket 6 in the thread path 7.
And the cam guide 3 of the looper thread reel 3 through the thread guide 13.
It engages with b as shown in FIG. 1, and is guided to the looper 2.
When the rotary shaft 5 and the looper thread reel 3 fixed to this rotate in synchronization with the vertical movement of the sewing needle 1 and the swing of the looper 2, the looper thread is fed and tightened according to the shape of the cam portion 3b. By loosening the screw 14 and rotating the looper thread reel 3 around the axis of the rotary shaft, the amount and timing of feeding and tightening the looper thread described above can be optimally adjusted.

A method of determining the mounting reference position of the looper thread reel in the looper thread reeling device constructed as described above will be described below.

First, under the standard sewing conditions, the screw 1
4 is loosened and the looper thread reel 3 is rotated around the axis of the rotary shaft 5 to determine the optimum mounting position, and then the looper thread reel 3
Are fixed with screws 14. Next, the rotating member 4 is fixed with the screw 8 in a state where the screw 8 is loosened and the notch 3a and the notch 4a are aligned with each other.

After that, the sewn person determines the adjustment position by rotating the looper thread reel 3 with respect to the rotary shaft 5 in accordance with the sewing condition. However, since the rotary member 4 is fixed to the rotary shaft 5, the looper thread reel By fixing the looper thread reel 3 by aligning the notch portion 3a of 3 with the notch portion 4a of the rotating member 4, it is possible to easily return the looper thread reel 3 to the reference position. Further, the work of removing the looper thread reel 3 from the rotary shaft 5 can also be performed with the rotary member 4 fixed to the rotary shaft 5.

Further, as shown in FIG. 3, the rotating member 26 has a cylindrical shape having an inner hole diameter substantially equal to the outer diameter of the rotating shaft 25, and is rotatably inserted into the rotating shaft 25 and screwed. Two
It may be fixed at 8. In this case, even if the rotary shaft 25 is rotatably supported by bearings provided on the left and right of the looper thread reel 23, the registration mark provided on the rotary member 26 by the above-described reference positioning procedure. 26a indicates the reference position.

Further, a plurality of rotary members, for example, a rotary member 34 and a rotary member 36 as shown in FIG. 4, may be provided. The rotating member 34 is a member that indicates the reference position, as in the above-described embodiment. The rotating member 36 is a member for indicating the adjustment position. The sewn person adjusts the mounting position of the looper thread reel 33 according to the sewing conditions, fixes it with the screw 37, and then fixes the rotary member 36 with the screw 38 in a state where the mark 33b and the mark 36a are aligned. . Since the sign 36a of the rotary member 36 indicates the adjustment position by such a procedure, when the looper thread reel 33 is removed due to the looper thread winding or the like, the sign 33b of the looper thread reel 33 is marked on the rotary member 36. By attaching this so as to match with 36a, the looper thread reel 33 can be easily returned to the adjustment position.

Further, as shown in FIG. 5, if the rotary member 44 has a structure in which a scale 44b is provided in addition to the cutout portion 44a serving as a mark, the looper thread reel 43 attached to the adjustment position is removed. At this time, by recognizing the graduation portion of the graduation 44b corresponding to the notch portion 43a which is the mark, the sewn person can return the looper thread reel 43 to a position substantially equal to the original adjustment position.

In the present embodiment, the sign of the rotary member 4 is a notch, but the structure of the sign is not limited to this, and any structure can be used as long as it can be recognized as the sign. It may take the form.

[0021]

As described above, according to the present invention,
After the reference position of the looper thread take-up is determined and fixed under the standard sewing conditions, the looper thread take-up attachment position is fixed by fixing the rotary member by matching the mark of the rotary member with the mark of the looper thread take-up. Even when the looper thread reel is changed or the looper thread reel is removed, the looper thread reel can be easily restored to the reference position by the instruction of the registration mark of the rotating member.
Particularly, if a plurality of rotary members are provided or the rotary members are provided with scales, not only the reference position of the looper thread reel but also the restoration to the adjusted position can be easily performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a looper thread take-up device for a sewing machine according to claim 1 of the present application.

FIG. 2 is a perspective view showing a configuration of a main part of the embodiment according to claim 1 of the present application.

FIG. 3 is another embodiment of a rotating member.

FIG. 4 is a perspective view showing a configuration of a main part of an embodiment according to claim 2 of the present application.

FIG. 5 is a perspective view showing a configuration of a main part of an embodiment according to claim 3 of the present application.

[Explanation of symbols]

1 sewing needle 2 looper 3 looper thread reel 3a Notch 4 rotating members 4a Notch 5 rotation axes 8,14 screws 12 looper thread 44b scale

Claims (3)

[Claims] 1. A sewing needle that moves up and down, a looper that swings in synchronization with the up and down movement of the sewing needle, a rotating shaft that rotates in synchronization with the up and down movement of the sewing needle, and a rotatable shaft. In a looper thread winding device for a sewing machine, which includes a looper thread reel that controls a looper thread that is inserted and guided to a looper, a rotating member that is rotatably attached to the rotating shaft, and a fixing member that fixes the rotating member. A looper thread take-up device for a sewing machine, characterized in that a mark is provided on each of the looper thread take-up and the rotary member. 2. The looper thread take-up device for a sewing machine according to claim 1, wherein a plurality of the rotating members are provided. 3. The looper thread take-up device for a sewing machine according to claim 1, wherein the rotary member is provided with a scale.