JP2624512B2 - Overlock sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine, and more particularly, to a configuration for facilitating threading on a looper.

[Conventional technology]

Usually, the underlooper extends laterally below the sewing machine bed, and there are parts such as a needle plate around and directly above the sewing machine bed, so that threading on the underlooper is troublesome. In order to facilitate the thread hooking, Japanese Utility Model Laid-Open Publication No. Sho 59-188078 has conventionally provided an arm having a thread guide at the tip thereof so as to be able to be raised on a luer arm, and to move the arm below the sewing machine bed. There has been proposed a looper device in which a thread is hung on a thread guide in a state where the thread is folded, and a thread on the thread guide is delivered to a base end side of a looper when an arm is in an upright state.

In Japanese Utility Model Laid-Open Publication No. 61-77964, a turning lever having a looper formed at the tip is detachably connected to a looper arm by a knob, and when thread is hooked, the turning lever is turned from the looper arm by operating the knob. After being removed from the sewing machine, an overlock sewing machine has been proposed which is configured to rotate it sideways to expose a looper to an opening of the sewing machine frame.

[Problems to be solved by the invention]

However, according to the former conventional device, the thread hooking position is set substantially below the sewing machine bed, so that not only the inconvenience that the operator hooks the thread near the bottom surface while looking into the sewing machine bed, but also the arm If the sewing machine is started in a state where the sewing machine is forgotten to be returned to the standing position or moved to the inverted position due to carelessness or the like, there is also a problem that the seam cannot be formed beautifully due to slack of the thread.

In addition, in the latter conventional configuration, in addition to the operation of rotating and returning the rotating lever to the side and the operation of loosening and tightening the knob before and after the threading, it is necessary to perform the threading with one touch. He had not been able to hang.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide an overlock sewing machine that can perform threading on a looper with almost one-touch operation.

[Means for solving the problem]

In order to achieve this object, the overlock sewing machine of the present invention is provided with a thread guide portion for swinging integrally with the looper near the base end of the looper and guiding the thread to the thread insertion hole of the looper, A movable member provided so as to be swingable integrally with the looper and movable relative to the looper, a first position facing the thread insertion hole, and a second position facing the thread guide portion. And a yarn transferer that is provided at the tip of the moving member so as to be movable between the first position and the second position, and transfers the yarn to the yarn guide at the second position. And a member.

[Action]

When the yarn is hooked, first, the yarn is hooked on the yarn transfer member arranged at the first position, and then the yarn is inserted into the loop insertion hole of the looper. At this time, the yarn transfer member corresponds to the yarn insertion hole. Therefore, the threading to both can be continuously and rapidly performed. Next, when the yarn transfer member is moved to the second position and the yarn is hooked on the yarn guide portion, the yarn extends from the base end of the looper toward the yarn insertion hole by the yarn guide portion.
Therefore, the thread can be easily hooked on the looper by almost one-touch operation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a cloth presser 4 is mounted on an arm portion 2 of a sewing machine frame 1 via a presser bar 3 and two sewing needles 6 are vertically movable via a needle bar 5. Is provided. A needle thread (not shown) is supplied to the eye 6a of the sewing needle 6 via a thread tensioner (not shown) or the like.

Under the sewing machine frame 1, an under looper 11 and an over looper 16 are provided. The looper thread is supplied to the thread insertion holes 11a and 16a at the tips of the loopers 11 and 16 through a thread tensioner and a looper balance (not shown). By the cooperation of the upper and lower loopers 11 and 16 and the sewing machine needle 6, a chain stitch is formed on a work cloth (not shown) using a needle and a looper thread.

The lower front surface of the machine frame 1 excluding the front surface of the bed 10 is covered with a cover 13 so as to be openable and closable. Reference numeral 14 denotes a guide plate for guiding a piece of the work cloth cut by a cutting device (not shown), and is opened and closed integrally with the cover 13.

Next, the under looper 11 (hereinafter abbreviated as a looper) and its related configuration will be described in detail.

A looper arm 18 is swingably provided in a sewing machine frame 1 by a looper shaft 17 connected to a sewing machine main shaft (not shown), and a threading base 19 is fixed to a tip of the looper arm 18. The looper 11 is fixed to 19 by a screw 20 and a long hole 21 so that the looper 11 can be adjusted vertically and positioned below the bed surface. A thread guide groove 23 is formed in the front surface of the looper 11 along the longitudinal direction thereof, and the thread insertion hole 11a is formed at the tip of the groove 23.

As shown in FIGS. 3 and 5, a projecting piece 24 is formed integrally with the left end of the threading base 19 near the base end of the looper 11,
A horizontal V-shaped thread guide hole 25 is provided therethrough. The upper end of the protruding piece 24 is bent forward and is joined to the front surface of the base end of the looper 11, and the upper end of the thread guide hole 25 located at this joint portion guides the looper thread LT to the thread insertion hole 11a. The deriving unit 26 is provided. The lower end of the thread guide hole 25 is an introduction portion 27 for introducing the looper thread LT from the balance side.

A guide rail 29 extending substantially along the looper 11 is fixed between a support piece 28 projecting from the right end of the threading base 19 and the projecting piece 24. A slider 30 as a moving member having a shorter length is supported on the guide rail 29 so as to be movable left and right.

At the left end of the slider 30, as shown in FIGS.
A letter-shaped hooking piece 32 is formed by bending, and on both upper and lower edges,
A bent piece 33 having a hook recess 34 for hooking the looper thread LT and an inclined edge 33a for guiding the looper thread LT is formed in the hook recess 34. Between each bent piece 33,
A rotating piece 36 for holding and releasing the looper thread LT in the retaining recess 34 is supported by a pin. A spring 37 for urging the rotating piece 36 in the opening direction is provided between the rotating piece 36 and the retaining piece 32.
Is engaged. At the right end of the slider 30, an operation unit 38 for moving the slider 30 is mounted.

The hooking piece 32 and the rotating piece 36 constitute a thread delivery member 39, and the thread delivery member 39 is operated together with the slider 30 on the guide rail 29 by operating the operation unit 38.
A first position facing the thread insertion hole 11a of the looper 11 as shown in FIGS. 3 and 4, and the thread guide hole 25 as shown in FIGS.
Is moved between the first position and the second position. In the first position, the turning piece 36 of the thread transfer member 39 is closed against the action of the spring 37 by engagement with the guide rail 29, and the looper thread LT is locked by the turning piece 36. It is held in the recess 34 and in the second position,
Is disengaged from the guide rail 29, and the rotating piece 36
The looper thread LT is released by the action of 37, and is transferred to the thread guide hole 25 via the rotating piece 36.

When the thread transfer member 39 is located at the first position, a part of the slider 30 abuts on the support piece 28 of the threading base 19, and the movement of the slider 30 to the right is restricted. You. The thread transfer member 39 is a guide rail.
The small holes 40 of the 29 and the projections 41 of the slider 30 are fitted and positioned at the second position. Further, the operation unit
An arrow 42 for supporting the operation direction is provided on a front surface of the thread 38, and an index of the threading base 19 at a second position of the thread transfer member 39.
There is provided a display 44 corresponding to 43. Shown in Figure 1
47 is a manually operated pulley.

 Next, the operation of the above configuration will be described.

FIG. 1 shows a stopped state of the sewing machine in which the looper 11 is disposed at the left swing end position. To thread the looper 11 in this state, first open the cover 13 and operate the pulley 47 to operate the looper arm 18.
Is rotated rightward to expose the operation unit 38 to the outside of the bed unit 10 through the thread insertion hole 11a of the looper 11, as shown in FIG. Subsequently, by pulling the slider 30 to the right while grasping the operation section 38, the thread transfer member 39 is disposed at the first position outside the bed section 10 where the thread is easily hooked, as shown in FIGS. Is done.

Next, the looper thread LT guided from the balance side is hooked from the left side of the thread transfer member 39 to the hooking recess 34 via the inclined edge 33a, and the tip is inserted into the thread insertion hole 11a of the looper 11. . In this case, since the yarn transfer member 39 is exposed to the outside and is located at a position not so low as compared with the bed surface, the yarn can be easily hooked on the yarn transfer member within the field of view of the operator. . Moreover, since the left side of the thread transfer member 39 is opened in a V-shape, unlike the case of threading through the hole, the middle part near the tip of the looper thread LT is easily hooked on the hook recess 34. be able to. Further, since the thread transfer member 39 at this position corresponds to almost directly below the thread insertion hole 11a of the looper 11, the looper thread LT that has exited from the hooking recess 34 can be easily guided to the thread insertion hole 11a.

In this threading state, subsequently, by operating the operation unit 38 to the left and moving the slider 30 to a position where the display 44 matches the index 43, as shown in FIGS. The thread transfer member 39 is disposed at the second position by fitting with the portion 41. Then, since the rotating piece 36 is disengaged from the guide rail 29, the tip of the rotating piece 36 is released and rotated by the action of the spring 37 to a position where it projects to the rear side of the projecting piece 24, and the looper thread LT is released from the hooking recess 34. Is done.

Then, when the sewing machine is started in this state, the looper thread LT separates from the thread transfer member 39 and is transferred between the introduction portion 27 and the lead-out portion 26 of the thread guide hole 25 due to the tension generated by the stitch formation. The thread reaches the thread insertion hole 11a along the thread guide groove 23 of the looper 11, and the thread hooking on the looper 11 is completed.

By threading as described above, the looper thread LT can be hooked onto the thread transfer member 39 and the threader can be threaded onto the looper 11 with good operability by almost one-touch operation of moving the slider 30 to the left. it can. Also, after the yarn is hooked, the looper yarn LT is hung between the introduction portion 27 and the lead-out portion 26 located at both ends of the horizontal V-shaped yarn guide hole 25 and is detached from the slider 30. Second thread transfer member 39
Looper thread even when moving from the position to the first position
There is no risk that the LT will come off the thread guide hole 25 and become loose, and a beautiful chain stitch without thread slack can be formed.

In the above-described embodiment, a spring is attached to the thread transfer member 39.
Although the turning piece 36 is provided, the turning piece 36 is automatically released by the thread tension at the time of forming the stitch. Therefore, even if the spring 37 is omitted, the same operation as described above can be obtained. Further, in the above description, the thread transfer member 39 is arranged at the second position during the operation of the sewing machine. However, since the looper thread LT does not come off the thread guide hole 25 after the thread is hooked for the above-described reason, the thread transfer member 39 The operation of the sewing machine with the 39 in the first position does not cause any trouble.

〔The invention's effect〕

As described above in detail, according to the present invention, the yarn transfer member is movably supported between the first position facing the yarn insertion hole and the second position facing the yarn guide, and the yarn is transferred. At the first position, the thread is hooked to the thread delivery member, and at the second position, the thread is delivered from the thread delivery member to the thread guide portion. It has an excellent effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of an overlock sewing machine showing one embodiment of the present invention, FIG. 2 is a front view of a thread hooking mechanism showing a thread hooking start state, and FIG. Front view of the thread hooking mechanism showing a state where the positions are arranged, FIG.
3 is a partially omitted top view of FIG. 3, FIG. 5 is a front view of a thread hooking mechanism showing a state where the thread transfer member is arranged at a second position, and FIG. 6 is a top view of FIG. . In the drawing, 1 is a sewing machine frame, 6 is a sewing needle, 11 is an under looper, 11a is a thread insertion hole, 18 is a looper arm, 2
5 is a thread guide hole, 30 is a slider, 39 is a thread transfer member, L
T is a looper thread.

Continuing from the front page (72) Inventor Shinsuke Nagasaka 9-35, Horitadori, Mizuho-ku, Nagoya-shi, Aichi Prefecture Inside Brother Industries, Ltd. (56) References JP-A-63-240895 (JP, A) JP-A-61-174582 (JP, U) JP-A-54-4158 (JP, U) JP-A-59-188078 (JP, U) Japanese Utility Model Showa 61-77964 (JP, U) Japanese Patent Publication No. 60-43995 (JP, B2) Japanese Utility Model Hei 6-25271 (JP, Y2)

Claims (1)

(57) [Claims] 1. A sewing machine needle (6) which can be moved up and down, and a looper which is formed at the upper end of a swingable looper arm (18) so as to extend in the lateral direction and has a thread insertion hole (11a) at the tip. 11), and the sewing needle (6) and the looper (1) are provided.
In the overlock sewing machine configured to form a chain stitch in cooperation with 1), a looper (11) is provided near a base end of the looper (11).
The thread insertion hole (11a)
A thread guide part (25) for guiding a thread (LT) to the looper (11), and a movable part provided so as to be swingable and movable with respect to the looper (11). A member (30), the moving member (30) being movable between a first position facing the yarn insertion hole (11a) and a second position facing the yarn guiding portion (25). And a yarn transfer member (39) for receiving the yarn (LT) at the first position and for transferring the yarn (LT) to the yarn guide portion (25) at the second position. Overlock sewing machine.