JPH1085475A - Thread passing device for overlock sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evade the collision of a thread passing hook and a needle even when the stop position of the needle is vertically shifted, to prevent thread passing incapability, to improve working accuracy, to eliminate the complication of a mechanism and to prevent the increase of the number of parts and the increase of a cost. SOLUTION: In an overlock sewing machine provided with a needle bar 2 to which the plural needles 7 and 8 for which the positions of eye holes 9 and 10 are different in vertical and horizontal directions are disposed, a thread passing mechanism 100 is constituted of a straight reciprocating motion mechanism 160 to be moved back and forth along straight guides 11 and 12 disposed in a direction perpendicular to the axis of the needle bar 2 and the thread passing hook 18 for passing a thread to the plural needles 7 and 8 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine provided with a needle bar provided with a plurality of needles having different positions of needle holes in vertical and horizontal directions. The present invention relates to a threading device of an overlock sewing machine including a threading mechanism that moves to thread the plurality of needles through a threading hook.

[0002]

2. Description of the Related Art A conventional threading device for an overlock sewing machine (Japanese Patent Laid-Open No. 5-293284) is a swinging member which swings around a fulcrum shaft S disposed above a needle bar B as shown in FIG. The threading mechanism I is constituted by Y, and the position of the threading hook H is controlled in accordance with the positions of the needle holes of the plurality of needles N by the swing position of the swing member Y.

[0003]

In the conventional threading device of the overlock sewing machine, the plurality of needles N are controlled by the swinging position of the swinging member Y constituting the threading mechanism I around the fulcrum axis S. Since the position of the threading hook H is controlled in accordance with the position of the needle hole, when the stop position of the needle N shifts up and down, the threading mechanism I is tilted by an amount corresponding to the height of the needle. Position, the position of the threading hook H with respect to the needle hole is vertically shifted in accordance with the left-right direction. Therefore, when the both are overlapped and in the worst case, the threading hook H and the needle N collide, There was a problem that threading could not be performed.

In order to prevent the threading mechanism I from shifting in the left-right direction, it is necessary to take measures to increase the stop position accuracy of the needle N, or to narrow the usable swing range of the threading mechanism I. As a result, there is a problem that the machining accuracy is improved, the mechanism is complicated, the number of parts is increased, and the cost is increased.

Accordingly, the present inventor has proposed an overlock sewing machine having a needle bar provided with a plurality of needles having different positions of the needle holes in the vertical and horizontal directions, wherein a threading mechanism is provided at right angles to the axis of the needle bar. Focus on the technical idea of the present invention that the needle is threaded through the plurality of needles through the threading hook, and further research and development is repeated, even if the stop position of the needle is shifted up and down, A book that achieves the object of preventing collision between the threading hook and the needle, preventing inability to thread, eliminating the need for improving machining accuracy and complicating the mechanism, and preventing an increase in the number of parts and an increase in cost. The invention has been reached.

[0006]

According to a first aspect of the present invention, there is provided a threading device for an overlock sewing machine.
In an overlock sewing machine having a needle bar in which a plurality of needles having different positions of the needle holes in the vertical and horizontal directions are provided,
A threading mechanism is provided for moving in a direction perpendicular to the axis of the needle bar and threading the plurality of needles through a threading hook.

[0007] In the threading device for an overlock sewing machine according to the present invention (a second invention according to a second aspect), in the first invention, the threading mechanism is disposed in a direction perpendicular to the axis of the needle bar. And a reciprocating mechanism for reciprocating along the linear guide.

[0008] In the threading device for an overlock sewing machine according to the present invention (a third invention according to a third aspect), in the second invention, the threading mechanism includes a selection mechanism for selecting a position of the reciprocating mechanism. It is equipped.

[0009] In the threading device for an overlock sewing machine according to the present invention (a fourth invention according to a fourth aspect), in the third invention, the selection mechanism is a cam engagement mechanism and a cam engagement mechanism. And a swing lever for controlling the engagement, and is configured to select the position of the threading shaft on the linear guide.

[0010] In the threading device for an overlock sewing machine according to the present invention (fifth invention according to claim 5), in the fourth invention, one end of the threading shaft disposed vertically movable on the linear guide. And a threading body that moves up and down.

According to a sixth aspect of the present invention, in the threading device for an overlock sewing machine according to the fifth aspect, the thread for restricting a rotation range of the threading body around the threading shaft is provided. It is provided with a threading regulating member.

[0012] In the threading device for an overlock sewing machine according to the present invention (a seventh aspect of the present invention), in the sixth aspect of the present invention, the threading body is provided in a turning range in which the threading body is regulated by the threading regulating member. When rotated around the threading shaft, the threading hook enters the eye hole, so that a thread can be hooked.

[0013]

According to the first aspect of the present invention, there is provided a threading device for an overlock sewing machine, comprising: a needle bar provided with a plurality of needles having different positions of needle holes in vertical and horizontal directions. In the sewing machine, since the threading mechanism moves in a direction perpendicular to the axis of the needle bar where the position in the vertical direction does not change and passes the plurality of needles through the threading hook, the needle stops. It is possible to avoid the collision between the threading hook and the needle due to the displacement, and to prevent the threading from being disabled.

In the threading device for an overlock sewing machine according to a second aspect of the present invention, in addition to the effects of the first aspect, the reciprocating mechanism constituting the threading mechanism is perpendicular to the axis of the needle bar. Reciprocating along the linear guides arranged in different directions, so there is no change in the vertical position, so that collision between the threading hook and the needle due to displacement of the needle stop position is avoided and threading is disabled. This eliminates the need for improving the processing accuracy and complicating the mechanism, thereby preventing an increase in the number of parts and an increase in cost.

[0015] In the threading device for an overlock sewing machine according to the third invention having the above-described structure, in addition to the operation and effect of the second invention, the selection mechanism constituting the threading mechanism can correspond to the plurality of needle positions. By selecting the position of the reciprocating mechanism, it is possible to select the plurality of needles.

A threading device for an overlock sewing machine according to a fourth aspect of the present invention having the above-described structure has the effect of the third aspect of the invention, and in addition to the effect of the third aspect, swinging of the swing lever constituting the selecting mechanism causes the cam engaging mechanism to swing. By controlling the engagement, a position on the linear guide of the threading shaft corresponding to the plurality of needle positions is selected, so that the plurality of needles can be reliably selected by a simple mechanism. This has the effect.

A threading device for an overlock sewing machine according to a fifth aspect of the present invention having the above-described structure has the same effects as the fourth aspect, and further comprises a threading shaft provided at one end of the threading shaft which is vertically movable on the linear guide. Since the provided threading body moves up and down, there is an effect that the threading to the needle hole is enabled.

In the threading device for an overlock sewing machine according to the sixth aspect of the present invention having the above structure, in addition to the functions and effects of the fifth aspect, the threading restricting member is configured to rotate the threading body about the threading axis. Since the range is regulated, there is an effect that the threading hook matches the needle through which the thread is passed.

A threading device for an overlock sewing machine according to a seventh aspect of the present invention, which has the above-described structure, has the same advantages as the sixth aspect, except that in the rotation range in which the threading body is regulated by the threading regulating member. When rotated around the threading shaft, the threading hook enters the eye hole to enter a threading state, and the threading body is raised to the upper storage position, so that threading is completed. An effect of surely threading is provided.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are described below.
This will be described with reference to the drawings.

(Embodiment) A threading device for an overlock sewing machine according to this embodiment comprises a plurality of needles 7 and 8 having different positions of eye holes 9 and 10 in the vertical and horizontal directions as shown in FIGS. In the overlock sewing machine provided with the needle bar 2 disposed, the threading mechanism 100 reciprocates along linear guides 11 and 12 disposed in a direction perpendicular to the axis of the needle bar. Constituted by a mechanism 160,
A threading hook 18 for threading the plurality of needles 7 and 8 is provided.

The needle bar 2 is provided with a needle bar holder 3 connected to an upper shaft (not shown) of the overlock sewing machine, and above and below the needle bar holder 3 at right angles to the axis of the needle bar 2. The upper and lower arms 1 are attached to the lower end, and the needle stopper 5 is attached to the lower end.

On the lower surface of the staple 5, there are first lengths having different lengths.
Sewing needle 7 and second sewing needle 8 are vertically fixed at intervals. A threading body 17 is provided substantially at the center of the needle bar 2.
The threading stopper 4 for determining the vertical stop position of the threading device is mounted.

The upper and lower arms 1 have a first guide shaft 11 and a second guide shaft 1 in a direction perpendicular to the axis of the needle bar 2.
2 is attached to the tip of the second guide shaft 12 by a swing pin 19 to form a selection knob 2 at the tip.
A selection lever 20 constituted by a swing lever provided with 2 is swingably arranged.

A threading bracket 13 is inserted and attached to the first and second guide shafts via a coil spring 25 so as to be slidable in the axial direction. A threading shaft 16 is attached to the threading bracket 13. It is slidably inserted in parallel with the needle bar 2.

In the present embodiment, the threading mechanism 1
00 is a selection mechanism 20 for selecting the position of the reciprocating mechanism.
0, comprising a cam engaging mechanism 21 and the swing lever 20 for controlling the engagement of the cam engaging mechanism 21;
The position of the threading shaft on the linear guides 11 and 12 is selected.

That is, the cam engaging mechanism 21 is provided with a cylindrical threading bracket 13 mounted on the threading shaft 16.
A protrusion 131 protruding from an outer wall at a lower end of the swing lever 20 and one end of the swing lever 20 so that the pitch in the horizontal direction of the eye holes 9 and 10 of the first and second needles 7 and 8 coincides with each other. It comprises a plurality of recesses 212 and 213 formed so as to cause a difference in the distance of the swing pin 19 from the axis.

The threading shaft 16 is provided with a threading body tightening screw 28.
A threading body 17 integrally formed with a threading hook 18 is fixed to the lower end, and the threading bracket 13 fixed to the upper end is provided with a threading regulating plate 14 for regulating the amount of rotation of the threading shaft 16. Are fixed by mounting screws 15.

A threading stopper pin 23 inserted and fixed to the threading shaft 16 is locked by the threading stopper 4 attached to a substantially central portion of the needle bar 2 to stop the threading body 17. Determine the position.

The threading shaft 16 has a threading regulating pin 2
4 is inserted and fixed, and engages with the threading regulating plate 14 to regulate the rotation range of the threading body 17, and regulates the rotation range of the threading body around the threading shaft 16. This constitutes a threading restricting member.

In the rotation range where the threading body 17 is regulated by the threading regulating member, the threading shaft 16
When rotated around, the threading hook 18 enters the eye holes 9 and 10 of the needles 7 and 8, so that the thread can be hooked.

The threading body 17 and the threading bracket 13
A return spring 26 is incorporated between them, and is configured to always urge the threading body 17 in a direction of being pulled upward.

The operation of the threading device for an overlock sewing machine according to this embodiment having the above-described configuration will be described below. Needle 7, which is set and controlled to stop within a certain range,
8, the first and second sewing needles 7 and 8 fixed to the needle bar 2 via the needle retainers 5 move the first and second eye holes 9 vertically and horizontally as described above. , 10 are assembled in different positions.

Therefore, the first and second eye holes 9, 1
When the thread is passed through the first eye, the thread is passed through each eye individually. To perform the threading through one eye, by operating the selection lever 20, the one eye is passed through the one eye to pass the thread. The position of the threading mechanism 100 is switched and fixed.

By operating the selection lever 20, the recesses 212 and 213 and the projection 1 constituting the switching cam mechanism 21 formed integrally with the selection lever 20 are formed.
The engagement relationship with the concave portion 212 is controlled.
Or, the cam lift 213 is set to generate the same amount of movement as the pitch of the eye holes 9 or 10 in the left-right direction, so that the cam lift 213 works with the projection 131 provided at the lower end of the threading bracket 13. The threading bracket 13 is moved left and right and fixed.

Due to the action of the coil spring 25, a load pressing the recesses 212 and 213 constituting the cam engaging mechanism 21 always acts on the threading bracket 13, so that the threading bracket 13 is prevented from loosening. And positioning.

After selecting a needle for threading by operating the selection lever 20, the threading body 17 is pulled down from the storage position to a position where the threading stopper 4 and the threading stopper pin 23 abut. By rotating the threading restricting plate 14 and the threading restricting pin 24 in a counterclockwise direction indicated by an arrow in FIG. 3 until the threading restricting pin 24 abuts, the threading hook 18 enters the eye hole for threading. Then, it is set in a state where the thread can be hooked.

In the above state, the thread is hooked on the threading hook 18, and the threading body 17 is moved in the clockwise direction opposite to the arrow in FIG. 3 until the threading regulating plate 14 and the threading regulating pin 24 come into contact with each other. When the user rotates the threading body 17 and releases his / her hand, the operation of the return spring 26 causes the threading body 17 to rotate.
Is returned to the upper storage position in FIG. 1, and the threading is completed.

The threading device for an overlock sewing machine according to the present embodiment having the above-described operation is provided by the needle bar 2 provided with a plurality of needles 7 and 8 having different positions of the needle holes in the vertical and horizontal directions.
In the overlock sewing machine provided with the needle, the threading mechanism 100 moves in a direction perpendicular to the axis of the needle bar where the position in the vertical direction does not change, and the plurality of needles 7 are moved through the threading hook 18. , 8, so that the collision between the threading hook and the needle due to the deviation of the stop position of the needle as in the conventional device can be avoided, and the threading cannot be disabled.

Further, in the threading device for an overlock sewing machine according to the present embodiment, the linear guide in which the reciprocating mechanism 160 constituting the threading mechanism 100 is disposed in a direction perpendicular to the axis of the needle bar 2 is provided. Since it reciprocates along 11 and 12, there is no change in the vertical position, so that a collision between the threading hook 18 and the needles 7 and 8 due to a shift in the stop position of the needle is avoided and threading is disabled. As a result, there is no need to increase the processing accuracy of the threading mechanism 100 unlike the conventional apparatus, and it is not necessary to complicate the mechanism, and thus it is possible to reduce the number of parts and reduce the cost.

Further, in the threading device for an overlock sewing machine according to the present embodiment, the selection mechanism constituting the threading mechanism 100 selects a position of the reciprocating mechanism 160 corresponding to the plurality of needle positions. This has the effect of enabling selection of the plurality of hands.

In the threading device for an overlock sewing machine according to this embodiment, the engagement of the cam engagement mechanism 21 is controlled by the swing of the swing lever 20 constituting the selection mechanism, so that the plural Since the position of the threading shaft 16 on the linear guides 11 and 12 corresponding to the position of the needle is selected, there is an effect that the plurality of needles can be reliably selected by a simple mechanism.

Further, in the threading device for an overlock sewing machine according to the present embodiment, the threading body 17 disposed at one end of the threading shaft 16 disposed vertically movably on the linear guides 11 and 12 is provided. Since it moves up and down, there is an effect that it is possible to thread the needle holes 9 and 10.

In the threading device for an overlock sewing machine according to the present embodiment, the threading regulating plate 14 regulates the rotation range of the threading body 17 around the threading axis, so that the needle through which the thread passes There is an effect that the threading hook 18 is matched with 7, 9.

Further, in the threading device of the overlock sewing machine according to the present embodiment, when the threading body 17 is rotated around the threading shaft in the rotation range regulated by the threading regulating plate 14, When the threading hook 18 enters the holes 9 and 10, the threading state is established, and the threading body 17 is raised to the upper storage position, thereby completing the threading. It works.

The above-described embodiments are exemplifications for explanation, and the present invention is not limited to these embodiments. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

[Brief description of the drawings]

FIG. 1 is an oblique front view showing a threading device of an overlock sewing machine according to an embodiment of the present invention.

FIG. 2 is a side view showing the periphery of a threading mechanism of the embodiment.

FIG. 3 is a bottom view showing the movement of the threading mechanism during threading in the embodiment.

FIG. 4 is a top view showing the positions of a threading shaft and a threading stopper when a thread is selected to pass through the first sewing needle 7 in the embodiment.

FIG. 5 is a top view showing the positions of a threading shaft and a threading stopper when a thread is selected to pass through the second sewing needle 8 in the embodiment.

FIG. 6 is an oblique front view showing a conventional threading device for an overlock sewing machine.

[Explanation of symbols]

 7,8 needle 11,12 Linear guide 9,10 Eye hole 18 Threading hook 100 Threading mechanism 160 Linear reciprocating mechanism

Claims (7)

[Claims] 1. An overlock sewing machine provided with a needle bar provided with a plurality of needles having different positions of needle holes in the vertical and horizontal directions, wherein the needle is moved in a direction perpendicular to the axis of the needle bar. A threading device for an overlock sewing machine, comprising: a threading mechanism for threading the plurality of needles via hooks. 2. The over-over device according to claim 1, wherein the threading mechanism includes a reciprocating mechanism that reciprocates along a linear guide disposed in a direction perpendicular to the axis of the needle bar. Lock sewing machine threading device. 3. The threading device for an overlock sewing machine according to claim 2, wherein the threading mechanism includes a selection mechanism for selecting a position of the reciprocating mechanism. 4. The linear guide according to claim 3, wherein the selection mechanism includes a cam engagement mechanism and a swing lever for controlling engagement of the cam engagement mechanism, and adjusts a position of the threading shaft on the linear guide. A threading device for an overlock sewing machine, wherein the threading device is configured to be selected. 5. The overlock sewing machine according to claim 4, further comprising a threading member disposed at one end of the threading shaft, which is vertically movable on the linear guide, and moves up and down. Threading device. 6. The threading device for an overlock sewing machine according to claim 5, further comprising a threading regulating member that regulates a rotation range of the threading body around the threading shaft. 7. The threading hook according to claim 6, wherein when the threading body is rotated around the threading shaft in a rotation range regulated by the threading regulating member, the threading hook enters the eye hole. A threading device for an overlock sewing machine, comprising: