KR20030014564A - Looper driving device of sewing machine - Google Patents

Abstract

PURPOSE: To provide a looper driving mechanism for a multithread chain stitch sewing machine, etc., by which stable stitches are obtained for a long term with excellent durability. CONSTITUTION: The mechanism includes a looper rod supported so as to be slidable in an axis direction and also rockable around an axis, a rocking arm which is horizontally rocked in connection with the rotation of a main shaft, a pair of holders attached to the looper rod in a state where they hold the end of the rocking arm so as to be slidable and a looper rod guide for rocking and driving the looper rod around the axis in connection with the rotation of the main shaft. Then a looper attached to the looper rod is moved in a prescribed oblong orbit by the synthetic motion of the rocking of the rocking arm with the rocking of the looper guide in the louver driving mechanism for the sewing machine. A pair of washers are held between the upper end of the rocking arm and the holders and, then, the washers are made to be rotatable around the shaft center of the looper rod.

Description

LOOPER DRIVING DEVICE OF SEWING MACHINE

The present invention relates to a looper driving mechanism of a sewing machine that operates in accordance with the up and down movement of a needle, such as a double-circle rod sewing machine or a sewing machine sewing machine.

Conventionally, in such a sewing machine, as shown in Fig. 5, the one-way rotational movement of the spherical crank portion 33a along the axis of the main shaft 33 that rotates in accordance with the up and down movement of the needle 30 is performed. Through the woofer rod 35 and the woofer crank 34, it converts to the rocking motion of the rocking arm 37 mounted on the looper vibrating shaft 36 and the woofer vibrating shaft 36.

The upper cylindrical portion 37a of the swinging arm 37 is fitted by the left holder 38 and the right holder 39 to both sides of the swinging arm upper cylindrical portion 37a such that there is no gap, and both holders 38 ) And 39 are inserted and fixed to the looper rod 32.

The swinging motion of the swinging arm 37 is converted from the swinging arm upper cylinder portion 37a to the axial reciprocating motion of the looper rod 32 via the left holder 38 and the right holder 39. . For this reason, the looper 31 mounted on one end of the looper rod 32 via the looper stand 31a is reciprocated in the axial direction of the looper rod 32.

On the other hand, as shown in FIG. 6, the one-way rotational movement of the eccentric wheel 43 detachably supported by the axis line of the main shaft 33 is the rocking motion of the looper rod guide 40 via the front-back rod 42. As shown in FIG. Is converted to.

The looper rod guide 40 is provided with a tapered long hole 40a. The looper rod is formed by the fitting member 41 inserted into the tapered long hole 40a and the left holder 38 which is protected by holding the fitting member 41 and inserted into the looper rod 32. The guide 40 and the looper rod 32 are connected.

The front and rear rods 42 are connected to the protrusion 44 of the looper rod guide 40. Accordingly, the looper 31 fixed to the outside of the shaft core at one end of the looper rod 32 performs the rocking motion of the shaft center rotation of the looper rod 32.

In the above configuration, the looper 31 performs the elliptical orbital motion as shown in FIG. 8 by the combined motion of the reciprocating motion in the axial direction of the looper rod 32 and the rocking motion of the axial rotation. In cooperation with the needle 30 to move downward, stitching, such as a double ring, is formed.

However, in the above conventional configuration, since the contact portions of the swing arm upper cylinder portion 37a, the left holder 38, and the right holder 39 are in contact with each other by a line, the operation of the above-described looper at high speed is performed. In the contact portion, the swing arm upper cylindrical portion 37a, the left holder 38, and the right holder are formed by the inertia forces generated by the looper rod 32, the left holder 38, the right holder 39, and the like. A large load is applied to either side of 39.

The load applied to the contact portion is particularly large at the left and right ends of the elliptical orbit shown in Fig. 8, and when the sewing machine is operated for a long time at high speed rotation, the tapping friction force generated at the contact portion is locally large. Then, the left holder 38 and the right holder 39 are locally rubbed, so that a gap is generated between the holder and the swing arm upper cylinder portion 37a as shown in FIG.

When the gap is generated, a problem arises in the trajectory of the looper 31 shown in Fig. 8, so that the up-and-down movement of the looper 31 and the needle 30 collapses, causing sewing failure. This has been a major obstacle to the advancement of sewing speed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and greatly reduces the friction generated at the contact portion between the pair of holders fixed to the looper rod and one end of the swinging arm, thereby making it difficult to generate a gap therebetween. It is therefore an object of the present invention to provide a looper driving mechanism of a sewing machine that can stably sew for a long time and can operate the sewing machine at a higher speed.

1 is a perspective view showing one embodiment of a looper driving mechanism according to the present invention;

FIG. 2 is a cross sectional view of FIG. 1

Figure 3 is a side cross-sectional view of Figure 1

Figure 4 is an exploded perspective view of the main part of Figure 1

Fig. 5 is a diagram corresponding to Fig. 2 showing a conventional example.

Fig. 6 is an equivalent view of Fig. 3 showing a conventional example.

7 is a schematic diagram showing a wear state after a long time operation in the conventional example;

8 shows the trajectory of the looper;

※ Explanation of code about main part in drawing

1: needle 3: looper

9: rocking arm 9a: rocking arm upper portion

10: looper rod 11: left holder 12: right holder

13 left support ring 14 right support ring 15 fitting member

16: Looper Rod Guide 16a: Tapered Long Hole 18: Front and Rear Rod

The looper driving mechanism according to the present invention is capable of sliding and moving in the axial direction parallel to the main axis of the sewing machine, and a looper rod supported by the swing of the axial rotation, and interlocked with the rotation of the main shaft. And a pair of holders attached to the looper rod coupled to the swinging arm while the swinging arm swinging from side to side and the tip of the swinging arm are in contact with the left and right sides so as to be in contact with each other, and the pivoting of the looper rod is possible. And a looper rod guide for oscillating the looper rod in axial rotation in association with the rotation of the lower shaft, which is supported by the lower shaft. By the combined movement of the rotation of the shaft by the guide, the looper attached to one end of the looper rod is applied to the looper driving mechanism of the sewing machine in which the predetermined elliptical orbital motion is performed. Come on.

A pair of support rings is inserted between the upper end of the swinging arm and the holder, and the pair of support rings are rotatable by the axial rotation of the looper rod.

Moreover, it is preferable to make a pair of support ring concentric, and to protrude the hole for a looper rod insertion in the center.

According to the present invention, a pair of supports sandwiched between an upper end of the swinging arm and the pair of holders when the looper rod having one end fixed to the looper are swinged in the axial direction and in the axial rotation direction. The ring arbitrarily performs a rotational movement of the axial rotation.

For this reason, the contact position of the support ring which contacts the edge part of the said rocking arm is not limited, As a result, the friction which arises in a support ring is distributed to the whole contact surface.

Example

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated based on drawing which showed the Example.

1 is a perspective view showing the structure of a looper driving mechanism of a sewing machine according to the present invention.

The looper 3 which performs sewing by the action of the needle 1 is attached to one end of the looper rod 10 via the looper stand 20. The looper rod 10 is substantially orthogonal to each of the up and down movement direction of the needle 1 and the conveying direction F of the forge and is disposed in parallel with the main shaft 5, and is fixed to the sewing machine body (not shown). The bush 21 and the bush 22 are fitted to be slidably movable in the axial direction.

The looper rod guide 16 is freely fitted with swings in portions of the bush 21 and the bush 22 with small diameters, and is supported so as not to shift in the longitudinal direction. The looper rod guide 16 has a tapered long hole 16a, and the fitting member 15 is fitted to the tapered long hole 16a.

In addition, the fitting member 15 slides in the longitudinal direction of the genital tapered long hole 16a. The protrusion 15a provided in the fitting member 15 is protected by the left holder 11 fixed to the looper rod 10.

As described above, since the looper rod 10 and the fitting member 15 are coupled through the left holder 11, when the looper rod 10 is slid in the axial direction, the fitting member 15 is moved. Moves along the tapered long hole 16a of the looper rod guide 16.

In addition, when the looper rod guide 16 is rocked by the axial rotation of the looper rod 10, the looper rod 10 is rocked in the axial rotation through the fitting member 15.

Next, the mechanism part for driving the looper 3 and the looper rod 10 is demonstrated.

First, FIG. 2 is explained about the drive mechanism part of the looper rod 10 in the axial direction.

The spherical eccentric portion 5a of the main shaft 5 and the looper crank 8 having one end fixed to the looper vibrating shaft 7 are connected by a looper rod 6. The looper vibration shaft 7 extends in a direction orthogonal to the main shaft 5. And this drive mechanism part transmits the axial rotation rocking motion to the looper vibration shaft 7 by the rotation of the main shaft 5.

The swinging arm 9 is fixed to the looper vibration shaft 7, and the swinging arm upper end 9a forms a cylindrical ring. The left holder 11 and the right holder 12 sandwich the swing arm upper end portion 9a without gaps through the left support ring 13 and the right support ring 14, and have a screw 11a and a screw 12a. Is attached to the looper rod 10. The left and right support rings 13 and 14 have a concentric shape and are rotatably fitted in the axial rotation of the looper rod 10.

When the rocking arm 9 swings according to the rocking motion of the looper vibrating shaft 7, the rocking arm upper end 9a is pressed against the contact surface of the left support ring 13 or the right support ring 14. For this reason, the rocking motion of the rocking arm 9 is transmitted to the left holder 11 or the right holder 12, and is converted into the reciprocating motion of the looper rod 10 in the axial direction.

Next, the drive mechanism part for rocking the looper rod 10 by axial rotation is demonstrated based on FIG.

One end of the front and rear rods 18 is rotatably connected to the eccentric wheel 19 fixed to the main shaft 5, and the other end thereof is connected to the protrusion 16b of the looper rod guide 16. This drive mechanism part transmits the oscillation motion of the axial center rotation of the looper rod 10 to the looper rod guide 16 via the eccentric wheel 19 and the front-rear rod 18 by rotation of the main shaft 5. As described above, the rocking motion of the looper rod guide 16 is transmitted to the looper rod 10 through the fitting member 15 and the left holder 11, and the looper rod 10 is rotated in axial rotation. Deliver oscillatory movements.

In the looper driving mechanism configured as described above, when the main shaft 5 is rotated by the drive source of the sewing machine, the looper rod 10 performs the axial reciprocating motion and performs the axial rotational swing motion.

As a result, the looper 3 attached to the outside of the shaft center at one end of the looper rod 10 has an elliptical orbit having a long axis in the axial direction of the looper rod 10, as indicated by reference numeral A of FIG. Perform the exercise. The movement of the looper 3 and the up and down movement of the needle 1 are made in synchronization, and by the action of the looper 3 and the needle 1, stitching of the double round bar is formed.

According to the embodiment of the present invention described above, according to the axial reciprocating motion of the looper rod 10, the looper rod 10 and the looper 3, the left holder 11, the right holder 12, etc. An inertia force occurs, and either the left support ring 13 or the right support ring 14 receives a load from the swing arm upper end 9a during the swing of the swing arm 9.

At this time, the support ring on the side not subjected to the load from the swing arm upper end portion 9a corresponds to the swing motion of the axial rotation of the looper rod 10, and swings the left holder 11 to the right holder 12. It rotates by axial rotation of the looper rod 10 in synchronization with.

On the other hand, the support ring on the side receiving the load from the swing arm upper end portion 9a restricts the rotational movement of the shaft center rotation. As a result, the left support ring 13 and the right support ring 14 perform an intermittent rotational motion on the rotation of the looper rod 10 independently of the left holder 11 and the right holder 12. .

By the rotational movement of the left support ring 13 and the right support ring 14, the contact position of the left support ring 13 and the right support ring 14 in contact with the swing arm upper end 9a is not limited. . Therefore, the friction of the left support ring 13 and the right support ring 14 produced by the load received from the swinging arm upper end 9a is dispersed throughout the respective contact surfaces.

In addition, in this embodiment, when the left holder 11 and the right holder 12 are formed of a material such as aluminum alloy to reduce the weight, the inertial force generated in the left holder 11 and the right holder 12 is reduced. Therefore, the load which the left support ring 13 and the right support ring 14 receive from the swing arm upper end part 9a can be reduced.

In addition, in the present embodiment, as shown in Fig. 1, the looper rod 10 is inserted into the bush 21 and the bush 22 fixed to the sewing machine body (not shown) so as to be slidably moveable in the axial direction. Although supported, it may be configured to be unilaterally supported by the bush 21 only.

As described above, according to the present invention, the friction generated on the contact surface of the pair of support rings due to the load received from the end of the swinging arm is not locally large and is uniformly distributed throughout the contact portion, thereby improving durability. In addition, the increase in the spacing generated at the upper end of the swing arm and the contact portion of the pair of support rings can be suppressed for a long time.

As a result, the looper fixed to one end of the looper rod can perform a stable orbital movement over a long period of time, thereby making it possible to stably sew for a long period of time and to secure separability due to an increase in sewing speed. It may be.

Claims (2)

A sliding motion in the axial direction parallel to the main shaft 5 of the sewing machine is possible, and in addition to the looper rod 10 supported by the rotation of the axial rotation and the rotation of the main shaft 5 A pair of holders attached to the swinging arm (9) swinging from side to side and the looper rod (10) coupled to the swinging arm (9) while the front end of the swinging arm (9) is fitted with left and right sides in contact with each other. (11) and (12) and a looper rod guide for oscillating and driving the looper rod 10 in axial rotation in conjunction with rotation of the lower shaft which is pivotally supported by the shaft center rotation of the looper rod 10. (16), by the combined movement of the axial reciprocation of the looper rod (10) by oscillation of the swinging arm (9) and the oscillation of axial rotation by the looper rod guide (16). The looper driving of the sewing machine in which the looper 3 mounted at one end of the looper rod 10 performs the movement of a predetermined elliptical orbit. In the sphere, A pair of support rings 13 and 14 are inserted between the upper end portion 9a of the swinging arm 9 and the holders 11 and 12, and the pair of support rings 13 and ( Looper drive mechanism of the sewing machine, characterized in that 14) rotatable by the axial rotation of the looper rod (10) The method of claim 1, The pair of support rings 13 and 14 are concentric in shape, and the looper drive mechanism of the sewing machine is characterized by protruding a hole for inserting the looper rod in the center thereof.