JPH064876Y2 - Overlock sewing machine width adjustment device - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention arranges a lower knife supported by a lower knife holder in parallel with the cloth feeding direction, and cooperates with an upper knife that moves up and down with respect to the lower knife. In an overlock sewing machine equipped with a mechanism that cuts cloth by movement, the lower knife can be moved left and right in the direction orthogonal to the cloth feed direction due to its compact and simple structure, and the cloth cutting width is optimally ensured by simple operation The present invention relates to a cutting width adjusting device for an overlock sewing machine which can be adjusted to the above.

"Conventional technology" Conventionally, when overedging with an overlock sewing machine, it was necessary to change the cut width of the cloth depending on the type of sewing cloth, the number of cloths to be sewn, and the sewing method. For this reason, it was necessary to move and adjust both the lower knife and the upper knife to the optimum positions. The conventional general lower knife adjustment method involves the work of adjusting the lower knife holder shaft, which is fixed to the frame of the sewing machine with a set screw, to an appropriate position by loosening the set screw, and re-fixing it. There is a drawback that it is difficult to make adjustments in a short time unless the operator is a proper worker. Therefore, in order to solve the above problems, in recent years, the lower knife holder is supported through a plurality of axes parallel to the direction orthogonal to the cloth feed direction, and the rotating force of the knob is used to screw, gear, cam. A method and mechanism for moving and adjusting the lower knife holder to the left and right by using, for example, are proposed (Shokai 62-7887).
No. 5, No. 62-109073, Jiukai Sho 62).

"Technical problem to be solved" Not only is it required to adjust the position of the lower knife with high precision at all times, but it is also required to be able to withstand a considerable load applied each time of cutting. . With such high precision and delicate lower knife position setting and posture control,
It was a difficult technical task to satisfy the contradictory technical requirements of maintaining a firm posture once positioned. Therefore, conventionally, there are disadvantages that the number of components is inevitably increased and it takes time to assemble, resulting in high cost and a large space for the width adjusting device when assembled.

The present invention is intended to solve the above technical problems, and is different from the conventional lower knife holder and has a three-dimensional posture control function and has a highly accurate uniaxial moving mechanism built-in. While developing a knife holder, a lower knife stud, which is a fitting part having a fitting part for three-dimensionally fitting with the lower knife holder and a needle plate fitting part, is newly provided, and the lower knife holder shaft support part of the conventional sewing machine frame is provided. The other purpose is to abolish the lower knife holder moving mechanism part, aiming at downsizing and high accuracy at the same time.

Further, the third invention is that the lower knife holder shaft supporting portion projecting laterally as in the prior art, the frame projecting so as to hinder the threading by the operator, and the lower knife holder having another axis structure are moved and set. The bottom of the sewing machine frame, the leg is erected at the tip of the cylinder mounting shaft protruding from the bottom of the sewing machine frame, and the lower female stud with the lower female holder mounting part is formed on the upper part of the leg to form the lower female stud. A space was formed at the bottom to facilitate threading.

"Means for solving problems" The present invention arranges the lower knife supported by the lower knife holder in parallel with the cloth feeding direction, and cuts the cloth in cooperation with the upper knife that moves up and down with respect to the lower knife. The present invention relates to an improvement of a width adjustment device for an overlock sewing machine including a mechanism for performing the above.

The first invention that intends to receive utility model registration is that the lower knife holder is fitted and fitted to the lower knife holder mounting portion of the lower knife stud, the lower knife is mounted on the lower knife holder of the lower knife holder, and the adjustment knob is rotated. By doing so, the lower knife holder and the lower knife can be moved back and forth by an appropriate width in the direction orthogonal to the cloth feed direction.

The lower knife holder has a lower knife mount formed on the front surface so that the blade of the knife can be fitted upward along the needle plate surface, and in the cloth feed direction on the back side of the lower knife mount. A posture control surface that prevents rotation is formed, and a rattling prevention projection that protrudes in a direction intersecting with the posture control surface is provided on the ventral side of the lower knife mount, and a female screw is provided in a direction orthogonal to the cloth feed direction. The moving nut portion that has been drilled is provided so as to project, and an operating screw shaft having an adjusting knob at the tip is screwed into the female screw of the moving nut portion, and when the operating screw shaft is rotated by the adjusting knob. The lower knife holder is configured to be movable left and right in the axial direction of the operation screw shaft via the moving nut portion.

On the other hand, the lower female stud has a needle plate mounting part on the upper end, and a lower female mounting base can be fitted to the lower part of the lower female stud. A lower female attachment base fitting groove having a posture-regulating sliding surface that can slide in the orthogonal direction and a backlash preventing protrusion are fitted, and the backlash preventing protrusion is slidable in a direction orthogonal to the cloth feeding direction. A lower knife holder mounting portion is formed that includes a receiving groove and a moving nut portion fitting guide portion that can be mounted so that the moving nut portion can slide in a direction orthogonal to the cloth feeding direction.

The second invention intended to receive the utility model registration is an improvement of the lower knife holder described in the first claim, so that the lower knife can be attached to the front side so that the blade part thereof can be attached upward along the needle plate surface. When the formed lower knife mount is formed, a posture control surface for preventing rotation in the cloth feed direction is formed on the back side of the lower knife mount, and a posture control surface is formed on the rear side of the lower knife mount. A nut for movement that has a play preventing protrusion protruding in a direction intersecting at a right angle, and a screw hole is formed on the ventral side of the lower female mounting portion in a direction orthogonal to the posture control surface and the play preventing protrusion. Part is projected, the operation screw shaft with the adjustment knob at the tip is screwed into the female screw of the movement nut part, and when the operation screw shaft is rotated by the adjustment knob, the movement nut part is inserted. The lower knife holder moves left and right in the axial direction of the operating screw shaft. By being configured such that a cutting width adjustment device overlock sewing machine according to claim.

The difference from the first claim is that the attitude control surface and the backlash preventing projection are simply in an intersecting state or projecting by specifying the intersecting direction at a right angle.

A third invention intended to receive a utility model registration is a lower knife in which a leg is planted at the tip of a cylinder mounting shaft protruding from the bottom of a sewing machine frame, and a lower knife holder mounting portion is provided above the leg. A cutting width adjusting device for an overlock sewing machine characterized in that a stud is provided and a lower knife holder is attached to the lower knife together with the lower knife so that the lower knife holder can be laterally moved by an appropriate width in a direction orthogonal to the cloth feed direction. is there.

The third invention is characterized mainly in that the planting type lower female stud is fixed to the cylinder mounting shaft projecting from the lower part of the sewing machine frame, and the lower female holder is concretely described in the first and second inventions. Needless to say, it is not necessary to limit the configuration to that.

[Example] FIG. 1 is a right perspective view of a lock sewing machine with a front cover and a cylinder opened, FIG. 2 is a plan view of a cutting width adjusting device of the lock sewing machine, and FIG. 4 is a right side view of the cutting width adjusting device, and FIG.
The figure is an exploded perspective view of each component of the cutting width adjusting device.

FIG. 1 is a right perspective view of a lock sewing machine in which a front cover A and a cylinder B are opened. In FIG. 1, reference numeral 1 denotes a sewing machine frame of an overlock sewing machine, which is a cylinder mounting shaft 2 protruding from a lower portion of the sewing machine frame 1. The lower female stud 4 is attached so that the leg 3 is planted at the tip. The lower female stud 4 has a lower female holder mounting portion 1 on the upper portion of its leg portion 3.
0 is configured, and the lower knife holder 5 and the lower knife holder mounting portion 10 of the lower knife stud 4 are fitted and mounted together with the lower knife 6 such that the lower knife holder 5 can move back and forth by an appropriate width in a direction orthogonal to the cloth feeding direction X. It is a cutting width adjusting device. In addition,
The upper knife 8 supported by the upper knife holder 7 is arranged above the lower knife 6 fixed to the lower knife holder 5.

By providing the lower female stud 4 instead of the conventional frame, the cylindrical cover of the free arm of the cylinder (cylinder B) can be downsized to 85% of the conventional size, and smaller free arm sewing is possible. Further, since the component for mounting the lower knife holder 5 is the upright type lower knife stud 4, the sewing machine frame and the multi-axis mechanism, which have hitherto been an obstacle during the threading work of the operator, are eliminated, and the threading is prevented. It's easier to do. In addition, frame processing has become easier and less costly, resulting in cost advantages.

In the present invention, as shown in FIG. 5, the lower knife holder 5 is fitted and mounted on the lower knife holder mounting portion 10 of the lower knife stud 4, and the lower knife 6 is mounted on the lower knife mount 11 of the lower knife holder 5.
Is attached with a set screw 30. The lower knife holder 5 is formed with a uniaxial moving nut portion 12 protruding from the rear surface of the lower knife mount 11, and the moving nut portion 1 is formed.
An operating screw shaft 15 having an adjusting knob 14 at its tip is screwed into a female screw 13 penetrating in the axial center direction of 2. Therefore, when the adjusting knob 14 is rotated, the lower knife holder 5 together with the lower knife 6 is rotated. Can be moved left and right by an appropriate width in a direction (Y, reverse Y direction) orthogonal to the cloth feed direction (X direction). In this way, it is possible to move the lower knife 6 together with the lower knife holder 5 in the direction (Y, reverse Y direction) orthogonal to the cloth feed direction (X direction) by an appropriate width from side to side. It is a width adjustment device. Such a width adjustment device needs to satisfy the contradictory technical requirements of delicate posture control and firm fixation at the same time. However, the present invention, for this purpose, controls the lower knife holder 5 three-dimensionally. It is characterized in that it has a structure that allows it, and part of it has a built-in uniaxial movement adjustment mechanism, making it compact.

Further, as shown in FIGS. 2 to 5, the lower knife holder 5 has a lower knife 6 formed such that the blade of the lower knife 6 can be attached upward (in the reverse Z direction) along the needle plate 21. Although the mounting base 11 is provided, a posture control surface 16 for preventing the lower knife mounting base 11 from rotating in the cloth feeding direction (X direction) is formed on the back inclined surface of the lower knife mounting base 11. On the abdominal inclined surface of the lower knife mounting base 11, a trapezoidal vertical play preventing projection 17 is projected in a direction intersecting with the posture control surface 16. Further, on the back side of the lower knife mount 11, a moving nut portion 12 having a female screw 13 protruding in a direction (Y direction) orthogonal to the cloth feeding direction (X direction) is provided. An operating screw shaft 15 having an adjusting knob 14 at its tip is screwed into the female screw 13 of the moving nut portion 12, and when the operating screw shaft 15 is rotated by the adjusting knob 14, the operating screw shaft 15 is moved through the moving nut portion 12. The lower knife holder 5 is configured to be movable left and right in the axial direction (Y, reverse Y direction) of the operation screw shaft 15. It should be noted that the play preventing protrusion 1 that protrudes in a direction intersecting with the attitude control surface 16
It is desirable that the protruding directions of 7 are perpendicular to each other.

In this way, the posture control surface 1 is attached to the side surface of the lower knife holder 5.
6 and the rattling prevention projection 17 intersect each other in a V shape, and further, the posture control surface 16 and the rattling prevention projection 1 are provided on the back surface.
7 is characterized in that a moving nut portion 12 having a female screw 13 formed in a direction orthogonal to 7 is projected. That is,
In the present invention, since the lower knife holder 5 is configured to control the posture of the posture control surface 16, the backlash preventing protrusion 17 and the moving nut portion 12 in different dimension directions (three-dimensional directions), the lower knife holder 5 rotates, for example. Even if it is a simple uniaxial structure, there is no vertical or horizontal rattling even if there is a load when cutting the fabric, and it is desirable to be able to withstand it sufficiently.

Further, when the operation screw shaft 15 is screwed into the moving nut portion 12 of the lower knife holder 5 and the operation screw shaft 15 is rotated by the adjustment knob 14, the lower knife holder 5 is moved to the operation screw shaft 15 by the pitch of the screw. Another feature is that it is configured to move left and right in the axial direction (Y, reverse Y direction).

On the other hand, as shown in FIGS. 2 to 5, the lower female stud 4 is provided with a needle plate mounting portion 20 at its upper end, and a needle plate 21 is mounted through the needle plate mounting portion 20. ing. The lower knife holder mounting portion 10 is formed below the needle plate mounting portion 20. The lower knife holder mounting part 1
Reference numeral 0 includes a lower female mount fitting groove 23, a rattling prevention projection receiving groove 24, and a moving nut fitting guide portion 25. The lower knife mounting base fitting groove 23 can be fitted with the lower knife mounting base 11, and the attitude control surface 16 of the lower knife mounting base 11 abuts at the time of the fitting, and is orthogonal to the cloth feed direction (X direction). Is formed so as to have a posture regulating sliding surface 22 that is slidable in any direction, and the backlash preventing projection receiving groove 24 is on the opposite side of the posture regulating sliding surface 22 of the lower female attachment base fitting groove 23. A groove having a trapezoidal cross section is formed on the inner wall surface of the backlash prevention protrusion 17 so that the protrusion 17 can be slid in a direction orthogonal to the cloth feed direction (X direction). Further, the moving nut portion fitting guide portion 25 is formed wide so that the moving nut portion is fitted and slidable in a direction (Y direction) orthogonal to the cloth feeding direction (X direction). A fitting guide groove portion 26 and a guide cylinder portion 27 that rotatably and fixedly penetrates the operation screw shaft 15 to which the adjusting knob 14 is attached are formed on an extension line thereof.

In the illustrated embodiment, the operation screw shaft 15 is attached to the guide tube portion 27.
A shaft collar 28 is fixed to the distal end side of the guide cylinder portion 27 and a retaining ring 29 is fixed to the proximal end side thereof so as to be rotatably fixed therethrough. Further, reference numeral 31 in the figure is a stopper for moving the lower knife holder 5 left and right in a direction (Y direction) orthogonal to the cloth feeding direction X, and is fixed to a proper position of the lower knife stud 4 by a set screw 32. Furthermore, 33 is a lower looper.

"Effects" In the present invention, the lower female stud is provided instead of the conventional frame, and the lower female holder is fitted and mounted in the lower female holder mounting portion, so that the cylindrical cover of the free arm of the cylinder is 85% smaller than the conventional cover. And smaller free arm sewing is possible. Further, since the lower female stud is used, the frame and the multi-axis mechanism, which have been an obstacle to the threading of the worker until now, are eliminated, and the threading is facilitated. In addition, frame processing has become simple and easy, and the cost can be reduced.

Further, the lower knife holder according to the present invention is provided with a lower knife mount formed so that the blade of the lower knife can be attached upward along the needle plate surface, and the lower knife mount is provided on the back side thereof in the cloth feeding direction. In addition to providing a posture control surface to prevent rotation to the back, a rattling prevention projection protruding in a direction intersecting with this posture control surface is provided on its abdomen, and a screw hole is drilled in a direction orthogonal to the cloth feeding direction. And a moving nut portion is provided, a screw hole of the moving nut portion is screwed with an operating screw shaft having an adjusting knob at the tip, and the operating screw shaft is rotated by the adjusting knob, The lower knife holder is configured to be movable left and right in the axial direction of the operation screw shaft via the moving nut portion.

That is, the lower knife holder is configured to control the attitude of the posture control surface, the backlash preventing protrusion, and the moving nut portion in different dimension directions (three-dimensional directions), while the lower knife holder has A lower knife having a posture-regulating sliding surface that can be fitted to the knife mounting base and that can be slid in the direction (Y direction) orthogonal to the cloth feed direction by contacting the posture control surface of the lower knife mounting base during the fitting. The mounting base fitting groove and the backlash prevention protrusion are fitted together, and the backlash prevention protrusion receiving groove is slidable in the direction (Y direction) orthogonal to the cloth feed direction, and the movement nut is set in the cloth feed direction. Orthogonal direction (Y direction)
A lower female holder mounting portion including a moving nut portion fitting guide portion that can be slidably mounted is formed in advance, and the lower female holder is fitted and mounted in the lower female stud mounting portion.

As described above, according to the present invention, the operation screw shaft with the adjusting knob attached is fitted to the moving nut portion of the lower knife holder so that the screw shaft is fitted to the moving nut portion fitting guide portion of the lower knife holder. The lower knife holder built-in method reduces the number of parts, making it more compact than the conventional multi-axis method. In addition, the lower knife holder has a simple uniaxial structure and does not rotate even if the number of parts is small and miniaturized, and there is no vertical or horizontal rattling even if there is a load when cutting the material. Furthermore, when the operation screw shaft is screwed into the moving nut portion of the lower knife holder and the operation screw shaft is rotated by the adjusting knob, the lower knife holder is highly accurate in the axial direction of the operation screw shaft by the pitch of the screw. Since it is made to move to the left and right, smooth and highly accurate position movement is made possible by a simple rotating operation of the adjustment knob, and it is possible to accurately adjust to the desired cutting width in a timely manner.

In other words, the present invention can satisfy the requirements of downsizing, high-accuracy posture control, sufficient fixation to withstand load, and high-accuracy position adjustment by simple operation at the same time.

[Brief description of drawings]

FIG. 1 is a right perspective view of a lock sewing machine with a front cover and a cylinder opened, FIG. 2 is a plan view of a width adjusting device for a lock sewing machine, and FIG. 3 is a front view in which a main part of the width adjusting device is cut away. FIG. 4 is a right side view of the cutting width adjusting device, and FIG.
The figure is an exploded perspective view of each component of the cutting width adjusting device. <Description of main symbols> 1 ... Sewing machine frame, 2 ... Cylinder mounting shaft, 4 ... Lower knife stud, 5 ... Lower knife holder, 6 ... Lower knife, 10 ... Lower knife holder mounting part, 11 ... Lower female mount, 12 ... Movement nut part, 13 ... female screw, 15 ... operation screw shaft, 16 ... posture control surface, 17 ... backlash preventing projection, 20 ... needle plate mount, 21 ...... Needle plate, 22 ...... Attitude control sliding surface, 23 ...... Lower female mounting base fitting groove, 24 ...... Attendance of backlash prevention projection, 25 ...... Move nut fitting guide section.

Claims (3)

[Scope of utility model registration request] 1. An overlock sewing machine having a mechanism in which a lower knife supported by a lower knife holder is arranged in parallel with a cloth feeding direction, and a cloth is cut in cooperation with an upper knife that moves up and down with respect to the lower knife. In the above, the lower knife holder forms a lower knife mount formed on the front surface so that the blade part of the knife can be attached upward along the needle plate surface, and at the back side of the lower knife mount, cloth feed is performed. A posture control surface that prevents rotation in the direction is formed, and a rattling prevention protrusion that protrudes in a direction intersecting the posture control surface is provided on the ventral side of the lower knife mount, and on the rear side of the lower knife mount, A moving nut part protruding from a female screw is projected in a direction orthogonal to the feeding direction, and an operating screw shaft with an adjusting knob is screwed into the female screw screw of the moving nut part. , When the operation screw shaft is rotated by the adjustment knob, it moves. The lower knife holder is configured to move left and right in the axial direction of the operating screw shaft via the nut for use.The lower knife stud has a needle plate mount at the upper end and a lower knife mount at the bottom. And a lower knife mounting base fitting groove having a posture regulating sliding surface that is slidable in a direction orthogonal to the cloth feed direction by contacting the posture control surface of the lower knife mounting base during the fitting. Fit the anti-rattle projections and mount them so that the anti-raft projection receiving groove that can slide in the direction orthogonal to the cloth feed direction and the moving nut part can slide in the direction orthogonal to the cloth feed direction. A lower knife holder mounting part consisting of a movable nut part fitting guide part is formed, and a lower knife holder is fitted and mounted in the lower knife holder mounting part of the lower knife stud. Attach the lower knife to the and adjust the knob. Cut width adjusting device overlock sewing machine is characterized in that so as to lateral movement by an appropriate width in the direction perpendicular to the cloth feed direction lower knife with lower knife holder by rolling operation. 2. The lower knife holder according to claim 1, wherein the lower knife holder has a lower knife mount formed on the front surface such that the blade of the lower knife holder can be fitted upward along the needle plate surface. A posture control surface that prevents rotation in the cloth feed direction is formed on the back side of the knife mount, and a rattling prevention projection that protrudes in the direction orthogonal to the posture control surface is formed on the rear side of the lower knife mount. Is formed on the belly side of the lower female mount, and a moving nut portion having a female screw drilled in a direction orthogonal to the posture control surface and the rattling prevention protrusion is provided in advance. When the operation screw shaft with the adjustment knob at the tip is screwed into the female screw of the part and the operation screw shaft is rotated by the adjustment knob, the lower female holder is moved in the axial direction of the operation screw shaft via the moving nut part. Overlock characterized by being configured to move left and right Shin of the cut-width adjustment device. 3. A lower female stud having a lower female holder mounting portion is provided on the leg of the cylinder mounting shaft projecting from the lower portion of the sewing machine frame, and a leg is erected at the tip of the leg. A cutting width adjusting device for an overlock sewing machine, characterized in that a lower knife holder is mounted together with the lower knife so as to be movable left and right by an appropriate width in a direction orthogonal to the cloth feeding direction.