KR102392111B1 - Fixing and rotating jig for overlock sewing machine - Google Patents

Abstract

The present invention relates to a fixing and rotating jig for sewing objects for overlock sewing machine, which comprises: a jig body disposed adjacent to the sewing machine; a connecting part of a sewing machine motor power extending into the jig body and exposed on one side of the jig body; a timing bar having one end connected to the connection part of the sewing machine motor power and receiving the rotational force of the sewing machine motor to convert the same into linear reciprocating motion; a rotational force generating part connected to the other end of the timing bar to convert the linear reciprocating motion of the timing bar into rotational motion; a first rotational shaft mounted vertically on one side of the jig body to have a fixed center position and to receive rotational force from the rotational force generating part; a second rotational shaft disposed vertically on the other side of the jig body and rotating by receiving the rotational motion of the first rotational shaft; a power transmission means transmitting the rotational motion of the first rotational shaft to the second rotational shaft to rotate the second rotational shaft; a pressure plate fixed to a lower surface of the second rotating shaft and capable of rotation and vertical movement; a base disposed on an upper surface of the jig body and having a fixed center to be capable of rotation; and a first power part vertically moving the second rotational shaft up and down, wherein the rotational operation of the second rotational shaft proceeds in conjunction with the operation of a sewing machine needle.

Description

Fixing and rotating jig for overlock sewing machine {Fixing and rotating jig for overlock sewing machine}

The present invention relates to an overlock sewing machine jig, and more particularly, it proposes a new jig capable of uniformly and safely performing an overlock operation by rotating an object to be sewn while fixed.

Clothing and various fashion accessories are traditional fields that have been with human life, and are still continuously developing industries. In general, the garment manufacturing process proceeds with product planning and design, material purchase such as fabric, grading, podium, marking, and sewing preparation process, followed by the completion of sewing and processing. Although many processes are being automated in the garment manufacturing process, workers are still manually sewing using a sewing machine (sewing machine) in the sewing process.

Industrial sewing machines have various functions and types, and play an important role in processing and mass production of various fabrics such as clothes. With a sewing machine, you can quickly and accurately perform almost all hand-sewn methods, such as grooving, stitching, and slashing.

Overlock is a type of needle stitch that is sewn on one or more pieces of fabric as a stitching method. It is a stitch to finish the edges to prevent the fabric to be sewn from coming loose. It is used to finish the edges of handkerchiefs or scarves, and is also used for various embroidery and warp pens. Referring to FIG. 1 , for example, if two or three or more of the left round fabrics are overlapped and the edges are overlocked, one neat sewing product as shown on the right is completed. Compared to interlocks, unlike interlocks, which are mainly sewn closely on the visible external parts, overlocks are mainly used on the internal parts of invisible products and are characterized by a relatively wide finish.

Overlock stitching is possible to some extent by using a dedicated overlock sewing machine or by zigzag stitching on a general sewing machine. In both cases, the overlock target fabric is placed on the presser foot of the mode sewing machine, and the user moves the fabric in accordance with the vertical and linear motion of the sewing machine needle. . Even when using a dedicated overlock sewing machine, the operator must position the object to be sewn on the sewing machine needle and precisely adjust the position while moving the part to be finished overlock. In particular, overlocking a circular fabric, etc. is accompanied by greater difficulty compared to a straight fabric. More specifically, when performing an overlock operation using a sewing machine, the operator directly inserts a circular object to be sewn into the position of the sewing machine needle, and rotates the object to be sewn by hand during vertical movement of the sewing machine needle to perform the overlock operation. For example, in a state where a circular object to be sewn is loaded so that a part of the edge is placed at the lower position of the needle, the machine is operated manually or automatically while rotating the object to be sewn at a predetermined angle (ex. in the range of 90 to 180°) In this process, part of the edge of the object to be sewn is overlocked, and after stopping the sewing machine for a while, the same operation is repeated several times (ex. 2 to 4 times) for the rest of the edge of the object to be sewn, and finally one Overlock processing on the object to be sewn is completed.

In the conventional overlock operation like this, it is difficult to ensure that the overlock operation is performed only on the edge of the circular object to be sewn, unless it is an expert. In addition, there is a problem in that even skilled workers feel fatigue easily from continuous work in a situation in which the wrist and shoulder are strained during repeated overlock work, and dust is generated during overlocking of the object to be sewn. In addition, in the case of overlocking of circular objects to be sewn, the amount of overlocking of objects to be sewn for 8 hours per day for even skilled workers remains at the level of 200, and unskilled workers not only have a smaller amount of work but also the risk of safety accidents.

In the prior art, various techniques have been proposed to improve the function of an overlock sewing machine. For example, according to Patent Registration No. 10-0138920, when sewing thick fabric, a sewing machine having an auxiliary feed device for fabric that can sew uniformly so that the fabric does not have wrinkles by offsetting the difference in feed speed between the upper and lower parts of the fabric has been proposed, and according to Patent Registration No. 10-1107725, an overlock sewing machine having a structure that is easy to repair when a motor defect occurs has been proposed. In addition, according to No. 20-0364332 for the registration room, a sewing machine equipped with a server motor and a needle bar rotating device was proposed to significantly reduce operating noise and vibration compared to a device using an air cylinder. These prior arts improve workability by changing the function and structure of the sewing machine, but do not pay any technical attention to the improvement of the round-shaped to-be-sewn overlock work.

Therefore, there is an urgent need to develop a new device capable of automatically manufacturing a round overlock product and improving working efficiency and working stability.

The present invention has been devised under the technical background described above, and an object of the present invention is to provide an apparatus for automatically performing an overlock operation on a round-shaped object to be sewn with a conventional sewing machine.

Another object of the present invention is to provide a sewing machine auxiliary device capable of improving the overlock quality for a circular to-be-sewn even if the skilled person is not.

Another object of the present invention is to provide a new overlock sewing machine that does not damage the health of the operator even if the overlock operation is performed for a long time, greatly improves work efficiency, and has improved work stability.

In addition, other objects and technical features of the present invention will be presented in more detail in the following detailed description.

In order to achieve the above object, the present invention provides a jig body disposed adjacent to a sewing machine, a connection part of the sewing machine motor power extending inside the jig body and exposed on one side of the jig body, a connection part of the sewing machine motor power and one end are connected A timing bar that receives the rotational force of the sewing machine motor and converts it into a linear reciprocating motion, a rotational force generator connected to the other end of the timing bar to convert the linear reciprocating motion of the timing bar into a rotational motion, is vertically mounted on one side of the jig body A central position is fixed, a first rotational shaft receiving rotational force from the rotational force generating unit, a second rotational shaft that is vertically disposed on the other side of the jig body and rotates by receiving the rotational motion of the first rotational shaft, rotation of the first rotational shaft A power transmission means for transmitting an operation to a second rotation shaft to rotate the second rotation shaft, a pressure plate fixed to the lower surface of the second rotation shaft and capable of rotation and vertical movement, a base disposed on the upper surface of the jig body to have a fixed center and a rotatable base; It provides a fixing and rotating jig for fixing and rotating the object for an overlock sewing machine, comprising a first power unit for vertically moving the second rotation shaft up and down, wherein the rotation operation of the second rotation shaft is performed in conjunction with the sewing machine needle operation.

In the present invention, it is preferable that the rotational force generating unit has a reverse rotation preventing means to convert the linear reciprocating motion of the timing bar into an intermittent rotational motion.

In addition, in the present invention, the second rotating shaft may have a vertical moving rod built therein, and in this case, the second rotating shaft and the vertical moving rod rotate together by power transmission of the first rotating shaft, and power from the first power unit It is possible to control so that only the vertical moving rod moves in the vertical direction by receiving the .

The jig for an overlock sewing machine according to the present invention may further include a second power unit for horizontal movement of the second rotation shaft, and the start and end of the rotation operation of the rotation shaft, the start and end of the vertical vertical movement or horizontal movement of the rotation shaft It may further include a control circuit that can be controlled in conjunction with the operation of the sewing machine needle.

According to the present invention, it is possible to perform an automated overlock operation by simply attaching it to a commercial overlock sewing machine.

The jig for a sewing machine of the present invention can rotate a circular object to be sewn in association with the overlock operation of the needle of the sewing machine, and the intermittent rotation associated with the needle up and down operation can improve the quality of the overlock of the object to be sewn.

When the overlock sewing machine jig according to the present invention is used, a fast working speed is possible and the amount of overlock work per day can be greatly improved from 800 to 1000 or more.

In addition, even unskilled workers can perform overlock work and work in a certain shape and shape, so that the defect rate can be maintained at zero, and the overlock quality of the object to be sewn is uniformly improved while ensuring work safety.

1 is a photograph showing an example of an overlock finish for round cloth;
2 is a photograph showing a general overlock sewing machine in which a fixing and rotating jig to be sewn is not installed.
3 is a photograph showing an overlock sewing machine installed with a jig of the present invention;
4a and 4b are photos showing the components of the jig related to fixing and rotating the object to be sewn;
5 is a photograph showing a technical configuration for power transmission of the jig of the present invention;
6A and 6B are schematic diagrams illustrating power transmission and power conversion of the jig of the present invention;
7A and 7B are graphs showing the relationship between the needle operation speed and the jig rotation speed;
8a and 8b are photographs and schematic diagrams showing the vertical movement of the second rotating shaft and the lifting and lowering operation of the pressure plate;
9a to 9f are photos showing a state in which an overlock operation is performed on the object to be sewn by the jig operation of the present invention;
10 is a photograph of the object to be sewn worked with the overlock sewing machine equipped with the jig of the present invention;

The present invention relates to a new jig device or system mounted on an overlock sewing machine, and more specifically, to a jig for rotating an object to be sewn by interlocking with the needle operation speed of the overlock sewing machine.

The jig for an overlock sewing machine of the present invention is characterized in that the object to be sewn is fixed so as to be disposed near the sewing machine needle, and the object to be sewn fixed to the jig is rotated in conjunction with the vertical movement of the needle according to the operation of the sewing machine motor. The object to be sewn is circular fabric, leather, and other materials that can be sewn, and the center of the press plate of the jig is positioned to be spaced apart from the sewing machine needle by a predetermined distance and fixed at the point where the sewing machine needle moves up and down. The part to be sewn is rotated while the parts of the jig are rotated so that the edge of the sewing material is arranged. When the object to be sewn is overlocked by the operation of the sewing machine needle, the rotation of the jig stops. In particular, the present invention is characterized in that the intermittent rotation is performed in conjunction with the up-and-down motion of the needle when the object to be sewn rotates, which will be described later.

2 is a view showing a general overlock sewing machine in which a fixing and rotating jig to be sewn is not installed. A head is disposed on the upper part of the main body of the sewing machine, and a needle (needle) for performing an overlock operation with one side of the head spaced apart from the upper surface of the main body is mounted. A driving motor (not shown) is mounted on the lower part of the main body of the sewing machine, and a power transmission means such as a rubber ring is coupled to the motor shaft to transmit motor power to the driving shaft of one side of the sewing machine. A workbench (P) on which the object to be sewn is placed is provided where the head needle of the main body is located.

The present invention mounts a jig for fixing and rotating the object to be sewn on the work bench of a conventional overlock sewing machine. 3 shows an overlock sewing machine installed with a jig 100 according to a preferred embodiment of the present invention. Such a jig is fixed or detachably coupled to the sewing machine in full close contact with the sewing machine, the means for fixing the object to be sewn is arranged near the sewing machine needle, and the motor power is transferred by receiving the power transmitted from the motor of the sewing machine through the sewing machine. When involved in the operation of the jig, the rotation of the object fixing means of the jig is interlocked.

The fixing and rotating jig to be sewn for an overlock sewing machine of the present invention largely includes two power transmission mechanisms. First, a first power transmission mechanism that receives the sewing machine motor power and converts the rotational force into a linear reciprocating motion, and the first rotational shaft from the linear reciprocating motion generated by the first power transmission mechanism, and accordingly the second rotational shaft rotates equally It is composed of a second power transmission mechanism. Through this two-step power transmission mechanism, the sewing machine motor power is used as it is as a jig power, while the first rotary shaft rotates in a fixed state while the second rotary shaft rotates and horizontally moves at a predetermined angle around the first rotary shaft. it becomes possible Further, it becomes possible to switch the continuous rotational operation from the motor driving force to the intermittent rotational force.

4A and 4B show components of a jig capable of fixing and rotating an object to be sewn. The jig body 110 is disposed adjacent to the sewing machine and various parts for the jig operation are mounted or built-in. The connection part 120 of the sewing machine motor power extends into the jig body and is exposed on one side of the jig body. One end of the timing bar 130 , which is a key element of the first power transmission mechanism, is connected to the connecting part of the sewing machine motor power, and the other end of the timing bar is connected to the rotational force generating part 135 . The timing bar receives the rotational force of the sewing machine motor and converts it into a linear reciprocating motion, and the rotational force generating unit performs a function of converting the linear reciprocating motion of the timing bar into a rotational motion.

On one side of the jig body, the first rotation shaft 140 is vertically mounted, and on the other side of the jig body, the second rotation shaft 150 is vertically spaced apart from the first rotation shaft. The first rotation shaft has a fixed central position, and receives rotational force from the rotational force generator. The second rotating side is spaced apart from the upper surface of the jig body, and receives the rotational motion of the first rotating shaft. While the power transmitting means 160 is wound around the first and second rotation shafts, the rotational operation of the first rotational shaft is transferred to the second rotational shaft as it is, and the second rotational shaft rotates at the same speed as the rotational operation of the first rotational shaft. .

A pressure plate 154 is fixed to a lower portion of the second rotation shaft to enable rotation and vertical movement, and a base 156 is disposed on the upper surface of the jig body under the pressure plate. The base is rotatable with the center fixed to the jig body. While the object to be sewn is fixed between the pressure plate and the base in a charged state, the object to be sewn is rotated by the rotation of the pressure plate.

The second rotation shaft is capable of rotation of the shaft and horizontal movement of the shaft itself, and a portion of the shaft is vertically movable. To this end, a first power unit 170 for vertically moving the pressure plate is disposed on the upper portion of the second rotation shaft, and a second power unit 180 for horizontal movement of the second rotation shaft is disposed on one side of the upper part of the jig. The first power unit and the second power unit may use a cylinder or a linear motor, and both a hydraulic cylinder and a pneumatic cylinder may be used as the cylinder. In addition, although not shown, a control circuit unit for controlling each operation of the jig and interlocking the rotation of the rotation shaft of the jig with the operation of the needle according to the driving of the sewing machine motor may be further included.

5 shows a technical configuration for power transmission of the jig of the present invention. The first power transmission mechanism, the motor power connection unit 120 , the timing bar 130 , and the rotational force generator 135 are disposed on the lower side of the jig body, and the second power transmission mechanism, the first rotation shaft 140 , the power The transmission means 160 and the second rotation shaft 150 , and the pressure plate 155 and the base 156 are disposed on the upper side of the jig body. The first rotating shaft may be fixed to one side of the sewing machine body or to the rear of the jig body, and is positioned so as to be rotatable in a state in which a horizontal position and a vertical position are fixed.

The first support parts 112a and 120b are coupled to the outer peripheral surface of the first rotation shaft, and the second support parts 114a and 114b are coupled to one side of the first support part. The upper second support part 114a is connected to the upper first support part 112a to support the second rotation shaft, and the lower second support part 114b is connected to the lower first support part 112b to support the base.

The second rotating shaft has a vertical moving rod 152 built therein, the second rotating shaft and the vertical moving rod rotate together by power transmission of the first rotating shaft, and the second rotating shaft is vertical by receiving power from the first power unit. In a state where the position is fixed, only the vertical moving rod can be moved in the vertical direction.

The main configuration of the jig operation of the present invention will be sequentially described as follows. First, the first operation of pressing and fixing the object to be sewn by vertical movement of the second rotating shaft by the driving of the first power unit is performed, and through this operation, the object to be sewn can be charged or separated into the jig.

In addition, as the second operation in which the second rotation shaft is horizontally moved, the second rotation shaft can be moved in an arc shape at a predetermined angle around the first rotation shaft by, for example, changing the length of the cylinder shaft by the driving of the second power unit. there is. Through this horizontal movement, it is possible to move the second rotation shaft and the pressure plate and the base below it toward the sewing machine needle or return it to the contrary. Through this operation, the distance between the object to be sewn and the sewing machine needle is adjusted, and the object to be sewn can be moved to the needle position to perform an overlock operation, and the object to be sewn can be returned to the initial position after the operation is completed. In addition, through the length control of the cylinder shaft of the second power unit, it is possible to align the gap between the second rotary shaft and the sewing machine needle to match the size of the object to be sewn.

Next, in the third operation, with the object to be sewn fixed on the pressure plate below the second rotation shaft, the edge of the object to be sewn is rotated to be overlocked by the vertical operation of the sewing machine needle. In this case, the rotational operation of the second rotating shaft receives the driving force from the sewing machine motor and is interlocked with the sewing machine needle operation through the aforementioned first and second power transmission mechanisms. It is important that the rod rotates intermittently.

6A and 6B are schematic diagrams for explaining power transmission and power conversion of the jig of the present invention. Referring to FIG. 6A , rotation of one end of the timing bar 130 and linear reciprocating motion of the other end are shown. A linear motion mechanism 125 for converting the rotational operation of the motor power connection unit 120 is coupled to one end of the timing bar, for example, a crank mechanism, a cam structure, etc. are used to convert the rotational power of the sewing machine motor into a linear reciprocating motion. do. That is, during the first half rotation (R1) of the motor power connection part through the linear motion mechanism, the forward operation (L1) proceeds, and during the remaining second half rotation (R2), the timing bar proceeds the backward operation (L2) do.

In this case, the rotational force generating unit 135 connected to the other end of the timing bar has a built-in anti-reverse means, and rotates when the timing bar moves forward and stops when the timing bar moves backward. The rotational force generating unit coupled to the other end of the timing bar is a device capable of only one-way rotation because reverse rotation is prevented, and for example, a reverse rotation prevention bearing, a ratchet gear, a one-way rotation gear, a one-way coupling shaft, and the like may be used.

Power transmission through the timing bar leads to a rotational motion (the other end), a linear reciprocating motion (middle), and a one-way rotation (rotational force generator), and finally, an intermittent rotation is obtained. As a result, the rotational operation of the first rotational shaft 140 coaxially connected to the rotational force generating unit also rotates when the timing bar advances and performs an intermittent operation without rotation when the timing bar is restored. By changing the structure of the rotational force generator, it is also possible to design the rotational force generator and the first rotational shaft to maintain a stationary state when the timing bar advances, and to generate rotational motions of the rotational force generator and the first rotational shaft when the timing bar is returned.

A part such as a bearing may be inserted into the sewing machine motor power connection part 120 of one end of the timing bar to facilitate a rotational operation, and the linear motion mechanism 125 or the bearing may have a circular or elliptical structure. Compared to the circular structure, when the rotational operation is changed in various ways, the speed of the forward and backward processes of the timing bar can be changed. The speed of the saccade can also be changed.

The power transmission of the rotational force generator connected to the other end of the timing bar converts the linear motion of the timing bar into rotational motion, while generating the rotational force only in the forward motion (or backward motion) during the linear reciprocating motion of the timing bar, thereby causing intermittent rotational motion. And, this rotational motion is transmitted to the first rotational shaft 140, the power transmitting means 160, and the second rotational shaft 150 as it is, as shown in FIG. 6b.

The power transmission means is, for example, a timing belt or chain for transmitting the rotational motion of the first rotational shaft to the second rotational shaft while being wound around the first and second rotational shafts, and a gear for transmitting the rotational force of the first rotational shaft to the second rotational shaft A means such as a box may be used. When a timing belt is used, it is preferable that a gear groove is formed on the inner peripheral surface of the belt, and the gear groove is also formed on the outer peripheral surfaces of the first and second rotation shafts on which the timing belt is wound.

The intermittent rotational motion of the rotational force generating unit 135 is transmitted to the first rotational shaft 140 as it is and the intermittent rotation proceeds, and the rotation of the first rotational shaft causes an intermittent linear motion in the timing belt 160, which is a power transmission means, The intermittent linear motion of the timing belt again generates the intermittent rotational motion of the second rotating shaft. Through power transmission according to the intermittent one-way movement of the timing belt, the first rotational shaft and the second rotational shaft are linked to perform the same rotational operation. It becomes the same as the speed Vr1, and as a result, the rotational force generating unit controls the rotational speed Vg of the pressing plate 154 under the second rotational shaft. The power transmission mechanism determines the rotation speed of the object to be sewn rotated by the pressing plate. Through this power transmission, the driving of the sewing machine motor is simultaneously involved in the operation of the sewing machine needle and the rotation of the pressure plate (and object to be sewn) of the jig, and the timing operation of the pressure plate (and material to be sewn) becomes possible.

It is very important in terms of the overlock quality of the object that the rotation proceeds as a timing operation during the overlock operation of the object to be sewn by interlocking the pressure plate with the operation of the needle of the sewing machine. If the operation of the sewing machine needle, that is, the vertical movement speed and the rotation speed of the edge of the object to be sewn, is not in balance with each other, bending occurs in the overlock part and the quality of the finished product may be greatly reduced.

7A and 7B are graphs showing the relationship between the needle working speed and the jig rotation speed. When the initial speed change is simplified, the speed of the sewing machine needle can be expressed as in FIG. 7A, and the rotation speed of the second rotation shaft of the jig and the pressure plate is It can be represented by Figure 7b.

The speed Vs of the sewing machine needle is related to the number of stitches in the overlock, and when considering the vertical movement, the reciprocating vertical movement is performed at the speeds of Vs1 (rising), Vs2 (-Vs1, descending), Vs1 (rising), Vs2 (-Vs1, descending). will repeat In this case, the period of the vertical movement may be represented by Ts ( FIG. 7A ). In addition, the rotation speed Vg of the pressure plate (second rotation shaft) intermittently rotates in one direction to repeat at the speeds of Vg1 (rotation), Vg0 (stop), and Vg1 (rotation). In this case, the cycle of the intermittent rotation can be represented by Tg (FIG. 7b).

If the relationship between Vs and Vg is not kept constant, overlock finishing of the material to be sewn is impossible. That is, when the relationship Vs/Vg = a (a is a constant) is maintained, the edge of the object to be sewn is not distorted and a clean overlock is possible. In addition, the operating period Ts and Tg should also be maintained at a constant ratio. The jig of the present invention controls the power transmitted to the sewing machine needle and the power transmitted to the rotation of the pressure plate (rotation of the second rotation shaft) with the same motor (sewing machine motor) in order to make the ratio of Vs and Vg constant. As shown, intermittent rotation is generated through the power transmission mechanism, and as a result, it is possible to adjust the timing of the rotational operation of the object to be sewn rotated by being pressed by the jig.

In addition to the rotation of the pressure plate, it is important to fix the object to be sewn to the jig through vertical movement of the pressure plate. 8A and 8B are photographs and schematic diagrams showing the vertical movement of the second rotation shaft, and the vertical position of the vertical movement rod 152 inside the second rotation shaft 150 is changed by driving the first power unit 170, and the result The process of raising (154a) or descending (154b) of the pressure plate is shown. Inserting the object to be sewn in the elevated state of the pressing plate, and lowering the pressing plate again to fix the object to be sewn, the overlock operation proceeds.

9A to 9F show a state in which an overlock operation is performed on an object to be sewn by the operation of the jig of the present invention. In a state in which the first pressing plate is raised (FIG. 9a), after loading the object to be sewn, the pressing plate is lowered (FIG. 9b). Thereafter, the pressure plate is automatically (or manually) moved together with the second rotating shaft so that the edge of the object to be sewn is positioned under the needle of the sewing machine (FIG. 9c). In a state where the edge of the object to be sewn is positioned under the sewing needle, the sewing machine needle operates together with the rotation of the pressure plate, and the overlock is started (FIG. 9d), and the overlock is completed by one rotation of the object to be sewn (FIG. 9e). When the overlock is finished, the needle operation and rotation of the pressure plate stop, the pressure plate moves to the initial position, and the pressure plate rises (FIG. 9f)

This jig operation proceeds in the order of loading the material to be sewn, lowering the pressure plate, horizontal movement of the second rotation axis to the position of the needle, rotation & overlock of the pressure plate, and horizontal movement (return) of the second rotation axis. It may proceed in the order of horizontal movement of the second rotation axis, lowering of the pressure plate, rotation and overlock of the pressure plate, and horizontal movement of the second axis of rotation. In this jig operation and overlock process, the above-described control circuit unit appropriately controls the pressure plate raising and lowering operation, the jig male movement operation, and the rotation operation of the jig pressure plate (linked to the vertical operation of the sewing machine needle through the sewing machine motor drive), etc. If necessary, control buttons for starting and ending each step may be separately provided near the sewing machine.

10 is a photograph of an object to be sewn worked with the overlock sewing machine equipped with the jig of the present invention, and it can be seen that the upper and lower surfaces of the object to be sewn are cleanly overlocked. As a result of carrying out the overlock operation using the sewing machine jig of the present invention, the operation speed was improved, and the amount of work of 800 or more per day was shown for the circular patch-shaped object to be sewn, and even an unskilled person could easily perform the overlock operation. Overlock quality was improved uniformly, and it was possible to work in a certain shape and shape, and there were no defective products.

In the above, the present invention has been exemplarily described through preferred embodiments, but the present invention is not limited to such specific embodiments, and various forms within the technical spirit of the present invention, specifically, within the scope of the claims may be modified, changed, or improved.

100: jig for overlock sewing machine 110: jig body
112a, 120b: first support part 114a, 114b: second support part
120: motor power connection 125: linear motion mechanism
130: timing bar 135: rotational force generating unit
140: first axis of rotation 150: second axis of rotation
152: vertical moving rod 160: power transmission means
154: pressure plate 156: base
170: first power unit 180: second power unit

Claims (3)

The jig body disposed adjacent to the sewing machine,
A connection part of the sewing machine motor power extending into the jig body and exposed on one side of the jig body;
A timing bar having one end connected to the connecting part of the sewing machine motor power and converting the rotational force of the sewing machine motor into a linear reciprocating motion;
A rotational force generator connected to the other end of the timing bar to convert a linear reciprocating motion of the timing bar into a rotational motion;
A first rotational shaft that is vertically mounted on one side of the jig body to fix a central position, and receives rotational force from the rotational force generating unit;
a second rotational shaft which is vertically disposed on the other side of the jig body and rotates by receiving the rotational motion of the first rotational shaft;
Power transmission means for transmitting the rotational operation of the first rotational shaft to the second rotational shaft to rotate the second rotational shaft;
A pressure plate fixed to the lower surface of the second rotation shaft and capable of rotation and vertical movement;
It is disposed on the upper surface of the jig body, the center is fixed and the base is rotatable;
and a first power unit for vertically moving the second rotation shaft up and down,
The rotational operation of the second rotational shaft is characterized in that it proceeds in conjunction with the sewing machine needle operation.
A jig for fixing and rotating objects to be sewn for overlock sewing machines.
The method of claim 1,
The rotational force generating unit has a built-in reverse rotation prevention means to convert the linear reciprocating motion of the timing bar into an intermittent rotational motion.
The method of claim 1,
The second rotating shaft has a vertical moving rod built therein, the second rotating shaft and the vertical moving rod rotate together by power transmission of the first rotating shaft, and the vertical moving rod is moved in the vertical direction by receiving power from the first power unit A jig for fixing and rotating objects to be sewn for an overlock sewing machine, characterized in that.

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