JP2521325B2 - Overlock sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine that forms an overlock seam while cutting an edge of a work cloth.

[Prior Art] As a conventional overedging machine of this type, one having a structure as disclosed in, for example, Japanese Patent Laid-Open No. 62-159693 is known. In this conventional configuration, a lower knife holder for holding the lower knife is provided so as to be movable in a direction orthogonal to the cloth feed direction, and by rotating the adjusting knob, the moving body and the engagement between the male screw and the female screw are performed. The lower knife holder has been moved so that the overedging width can be adjusted.
Further, a stitch support is movably supported on the movable body in a direction orthogonal to the cloth feeding direction, and the position of the stitch support can be finely adjusted by loosening the fixing screw in a state where the overedging width is adjusted and set. It has become.

[Problems to be Solved by the Invention] However, in this conventional configuration, the adjustment of movement of the lower knife holder for changing the overedging width and the fine adjustment movement of the stitch support must be performed by different operations. The operation is very troublesome and the stitch support is supported by the moving body of the lower knife holder, and the stitch support is moved integrally with the lower knife holder as the overed width is adjusted. Each time, it is necessary to finely adjust the position of the stitch support according to the type of work cloth and the like, which causes a problem that the fine adjustment operation becomes extremely complicated.

The present invention has been made in view of the problems existing in such a conventional technique, and its object is to adjust the movement of the lower knife holder holding the lower knife when changing the setting of the overedging width. And fine adjustment of the stitch support,
It is an object of the present invention to provide an overedge sewing machine which can be easily operated by operating one adjusting member.

Means for Solving the Problems In order to achieve the above object, in an overlock sewing machine according to the present invention, an end of a work cloth which is arranged on a cloth feeding side of a needle drop position and fed to a needle drop position. In order to hold the upper and lower knife and the lower knife to cut the edge,
A lower knife holder movably provided in a direction perpendicular to the cloth feeding direction, and a needle pointing from the vicinity of the needle drop position to the cloth sending side,
And a stitch support provided so as to be movable in a direction orthogonal to the cloth feed direction, one adjusting member that can be adjusted to adjust the overedging width, and the lower knife holder and the stitch based on the operation of the adjusting member. And a moving means for moving one of the support and the other continuously and gradually moving the other.

[Operation] In the overedging machine configured as described above, 1
By operating the two adjusting members, the lower knife holder and the stitch support are separately moved in a continuous or stepwise displacement amount, and the overedging width and the fine adjustment of the stitch support are simultaneously performed.

Hereinafter, an embodiment of an overlock sewing machine embodying the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the sewing machine body 1 includes an arm portion 2 and a bed portion 3. The needle bar 4 is provided on the arm portion 2, and the sewing needle 5 and the bed portion 3 attached to the lower end thereof.
Overlock stitches S are formed on the edge of the work cloth W in cooperation with a looper (not shown) provided therein. The upper knife 6 is provided on the bed portion 3 so as to be vertically movable on the cloth feeding side from the needle drop position, and by cooperation of the upper knife 6 and the lower knife 7 provided on the bed portion 3 in a stationary state, The edge of the work cloth W sent to the needle drop position is cut prior to sewing.

Therefore, the supporting and moving structure of the lower knife 7 will be described in detail. The lower knife holder 8 is attached to the bed portion 3 through a pair of support pins 9 so as to be movable in the direction orthogonal to the cloth feeding direction, and the right side surface thereof. The lower knife 7 is fixedly held by a screw 10. The compression spring 11 is interposed between the spring seat 12 at the tip of each support pin 9 and the bed 3.
The lower knife holder 8 is urged to move leftward in FIG.

The needle plate 13 is fixed on the bed portion 3 of the sewing machine main body 1, and a fixed stitch support 14 is provided near the needle drop position so as to be directed toward the cloth feeding side. The holding member 15 is movably mounted in the bed portion 3 through a pair of support pins 16 in a direction orthogonal to the cloth feeding direction so as to be located near the lower knife holder 8. The movable stitch support 17 for temporarily holding the overlock stitch S formed by the above-mentioned stitch support 14 with the fixed stitch support 14 is directed from the vicinity of the needle drop position to the cloth delivery side. Is provided. The compression spring 18 is interposed between the spring seat 19 at the tip of each support pin 16 and the bed portion 3, and the action of this compression spring 18 urges the holding member 15 to move leftward in FIG. ing.

One adjusting member 20 for adjusting the overedging width is a support shaft 21.
Thus, it is rotatably attached to the bed 3 of the sewing machine main body 1, and a scale 22 corresponding to the overhang width is provided on the outer periphery thereof. The first and second cam members 23 and 24 are integrally formed on both side surfaces of the adjusting member 20, the first cam member 23 is formed of an end cam, and the second cam member 24 is formed of a peripheral cam. . Further, in this embodiment, as shown in FIG. 6, the first cam member 23 has a continuous displacement amount,
The total displacement of the second cam member 24 is substantially the same as that of the first cam member 23, but has a stepwise displacement amount, and each stage corresponds to each scale 22.

The first transmission lever 25 is rotatably mounted in the bed portion 3 by a support shaft 26, one end of which is engaged with the first cam member 23, and the other end of which supports one of the lower knife holders 8. The pin 9 is engaged. The second transmission lever 27 is rotatably mounted in the bed portion 3 by a support shaft 28, is engaged with the second cam member 24 at one end thereof, and is one support pin of the holding member 15 at the other end thereof. 16 is engaged. Then, with the cam members 23, 24 and the first and second transmission levers 25, 27, one of the lower knife holder 8 and the stitch support 17 is continuously moved based on the operation of the adjusting member 20. The moving means for moving the other stepwise is configured.

Now, in the overedging sewing machine configured as described above, the upper knife 6 and the lower knife 7 cooperate with each other to cut the edge of the work cloth W while the sewing needle 5 and the looper (not shown) cooperate with each other. Overedge seams S are formed. In this case, the lower knife 7 and the movable stitch tongue are moved through the first and second transmission levers 25 and 27 by the action of the first and second cam members 23 and 24 in accordance with the turning operation of the adjusting member 20. The support 17 is moved almost integrally in the direction orthogonal to the cloth feeding direction, and the overedging width can be adjusted. Also, at the time of this cloth edge cutting and seam formation,
The work cloth W is pressed by a cloth pressing body (not shown) and is extended toward the lower knife 7 side, and thereafter, when the work cloth W escapes from the cloth pressing body, the work cloth W contracts to the original length. The expansion and contraction rates of this work cloth W greatly differ depending on the type of work cloth W and the like. Therefore, when adjusting the overedging width, the lower knife 7
The relative position between the stitch support 17 and the stitch support 17 needs to be finely corrected according to the type of the work cloth W and the like.

Therefore, in the sewing machine of this embodiment, when the adjusting member 20 is rotated in accordance with the indication of the scale 22 corresponding to the overedging width and then the adjusting member 20 is rotated within the range of one scale, the first cam member is formed. By the action of 23, the lower knife holder 8 is slightly moved within the range of one scale in the direction orthogonal to the cloth feeding direction, but the second cam member 24 is constituted by the stepped cam portion corresponding to one scale. Therefore, the holding member 15 provided with the stitch support 17 is not moved within the first scale. Therefore, as a result, the relative position between the lower knife 7 and the stitch support 17 can easily be finely adjusted according to the type of work cloth.

It should be noted that the present invention is not limited to the configuration of the above-described embodiment, and, for example, two cam members are provided separately from the adjusting member, and each cam member is actuated via a rotating shaft or the like according to the operation of the adjusting member. Or the opposite of the above embodiment,
The amount of displacement of the first cam member is made stepwise and the amount of displacement of the second cam member is made continuous, etc., and the configuration of each part is arbitrarily changed within a range not departing from the spirit of the present invention. Can be converted.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, when the setting of the overedging width is changed, the lower knife holder holding the lower knife is moved and adjusted, and then, depending on the type of work cloth or the like. It is extremely easy to change the overedging width and finely adjust the relative positions of the lower knife holder and the stitch support by operating one adjusting member without the need for the troublesome operation of finely adjusting the stitch support. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an overedging machine embodying the present invention, FIG. 2 is an enlarged front sectional view showing the constitution of a lower knife holder and a stitch support, and FIG. 3 is the same constitution. FIG. 4 is a side sectional view, FIG. 4 is a partial plan view of the same, FIG. 5 is a plan view showing a state in which an overlock stitch is formed with respect to an edge of a work cloth, and FIG. 6 is a graph showing displacement amounts of two cam members. . 1 ... sewing machine body, 5 ... sewing needle, 6 ... upper knife, 7 ...
Lower knife, 8 Lower knife holder, 17 Stitch support,
20 ... Adjusting member, 23 ... First cam member, 24 ... Second cam member, 25 ... First transmission lever, 27 ... Second transmission lever.

Front page continuation (72) Inventor Shinsuke Nagasaka 9-35 Hotta-dori, Mizuho-ku, Nagoya, Aichi Brother Industry Co., Ltd. Within

Claims (1)

(57) [Claims] 1. The apparatus is disposed on a cloth feeding side from a needle drop position,
Upper knife (6) and lower knife (7) for cutting the edge of the work cloth (W) sent to the needle drop position, and orthogonal to the cloth feeding direction to hold the lower knife (7). Lower knife holder (8) movably provided in the direction
And a stitch support (17) which is provided from the vicinity of the needle drop position toward the cloth feeding side and is movable in a direction orthogonal to the cloth feeding direction, and an adjustable operation 1 for adjusting the overedging width. One adjusting member (20), and based on the operation of the adjusting member (20), one of the lower knife holder (8) and the stitch support (17) is continuously moved and the other is moved stepwise. Overedging machine characterized by having means (23, 24, 25, 27) for moving.