JPH0534633Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a cloth guide device for an overlock sewing machine, and more particularly to a cloth guide device for performing decorative stitches in the center of a cloth.

(Prior art) The fabric guide device of an overlock sewing machine guides the edge of the fabric appropriately when overlocking the edge of the fabric, which has been previously cut to a predetermined size, while cutting off a slight trimming allowance. For this purpose, it has been devised to provide a cloth guide device for guiding the edge of the cloth in front of the presser foot. In the conventional cloth guide device, the edge of the cloth is guided to the cloth guide to perform hem stitching, and the trimming distance is adjusted by moving the cloth guide piece in a direction perpendicular to the feeding direction.

(Problems to be Solved by the Invention) In addition to the above-mentioned overlock stitch, the overlock sewing machine has a sewing method in which a decorative stitch is applied to the center of the cloth as shown in FIG. As shown in FIG. 8, the decorative thread can be sewn into the center of the cloth by folding the cloth and performing overedge stitching without cutting the edges of the cloth, and then opening the cloth after sewing. In this case, the edge of the fabric must be sewn without being cut, and in the past, the position of the fabric guide was moved closer to the needle than the cutting line, and the movable blade was then moved to a position where it would not cut the fabric. Therefore, as mentioned above, when there is no trimming allowance or for decorative stitching in the center of the cloth, preparations are complicated, and a mechanism for that purpose must be provided.

(Means for solving the problem) A plate-shaped attachment part placed on the throat plate on the cloth feeding side of the presser foot of an overlock sewing machine and its rising part, and its rising surface on the right side of the cloth feeding side. A cloth guide surface arranged at a position closer to the needle than the cloth cutting surface and extending to just before the presser foot, and a positioning section that is a downward folded surface of the cloth guide surface and abuts against the side surface of the throat plate. , an extension of the positioning part in the feeding direction, which avoids the presser foot and is bent toward the needle just before the movable blade, and is arranged between the presser foot and the movable blade, and is a cutting line where the movable blade and the fixed blade touch; A guide ruler is provided with a movable blade cover that extends within a range not exceeding . To attach the guide ruler to the machine frame, a conical convex portion is formed on the mounting portion to fit a conical groove for accommodating a countersunk screw formed on the throat plate.

(Operation) To install the guide ruler, remove the countersunk screw that fixes the throat plate, align the conical convex part of the guide ruler with the conical groove of the throat plate, and touch the positioning part of the guide ruler to the right side of the throat plate. Then, fix the guide ruler and throat plate integrally to the machine frame with countersunk screws.

Due to this positioning and fixing, the cloth guide surface of the guide ruler is placed closer to the needle side than the cutting surface of the movable blade, and the movable blade cover at the tip of the guide ruler is placed just in front of the movable blade, and is fixed to the movable blade. Prevents cloth from entering between the blades.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

1 to 7, a needle 2 supported by a sewing machine frame 1 and moving up and down, a looper 3 that cooperates with the needle to form a stitch, and a looper 3 that is supported on a bed surface 4 of the sewing machine frame 1. The throat plate 5 forms a conical countersunk groove 5a so as to be substantially flush with the bed surface, and is fixed by a countersunk screw 9 having a shape matching the conical countersunk groove 5a.

A feed dog (not shown) that protrudes and retracts from a groove provided in the throat plate 5 and a presser foot 6 work together to feed the cloth.

The sewing machine frame 1 is arranged so that the cutting blade is located on the right side of the cloth feeding side of the needle drop point on the throat plate 5.
A fixed blade 7 is fixed to. A movable blade 8 is in pressure contact with the fixed blade 7, and is moved up and down by a driving means (not shown) of the sewing machine, so that it can cut the edge of the work cloth in cooperation with the fixed blade 7. It is composed of A safety cover portion 6a is formed on the presser foot 6 to prevent fingers or the like from entering between the movable blade and the fixed blade 7.

The guide ruler 10 includes a flat mounting part 11 disposed on the throat plate 5, a fabric guide part 12 which is a rising part of the mounting part 11, a positioning part 13 which is a folded part of the rising part, and an extension of the positioning part. The portion 13a has a shape that avoids the cloth presser foot 6, and has a movable blade cover portion 14 bent at its tip to prevent the cloth from entering between the movable blade 8 and the fixed blade 7. The mounting portion 11 is formed with a conical convex portion 11a and a conical countersunk groove 11b so as to match the conical countersunk groove 5a of the needle plate 5.

The guide ruler 10 is attached as follows. The countersunk screw 9 fixing the throat plate 5
loosen. As shown in FIG. 6, the conical convex portion 11a of the mounting portion 11 of the guide ruler 10 is aligned with the conical countersunk groove 5a of the needle plate 5, and the positioning portion 13
is in contact with the right side surface 5b of the cloth feeding side of the throat plate 5, and the countersunk screw 9 is aligned with the conical countersunk groove 11b of the mounting portion 11, and the guide ruler is attached to the sewing machine frame 1. 10 and the throat plate 5 are integrally fixed.

The installation state of the guide ruler 10 is as shown in FIG. 2, and the guide surface A of the cloth guide section 12 is set at a position closer to the needle drop side than the cutting surface B formed by the movable blade 8 and the fixed blade. has been done. The positioning part 1
3 avoids the presser foot 6 and presses the throat plate 5.
It extends along the right side surface 5b of the movable blade and is bent between the movable blade 8 and the safety cover part 6a of the presser foot 6 to form a movable blade cover part 14. The tip of the cover part of the movable blade is connected to the movable blade 8.
In order to prevent cloth from entering the movable blade 8, the blade surface B of the movable blade 8 is set within a range that does not rise.

Next, the guide ruler 10 installed in this way
The case of applying decorative stitches to the center of the cloth using the sewing machine will be explained with reference to FIG. 8. For decorative stitching in overlock sewing machines, decorative threads are usually used for looper threads, which are easy to use.

In order to place the looper thread on the front side of the fabric and the needle thread on the back side of the fabric, stitches of stitch type 503 (one needle, two thread specifications) or stitch type 505 (one needle, three thread specifications) are used. It will be done. Here, a case will be described in which the stitch format 503 is used.

The fabric is folded in half at the area where decorative stitching is to be performed and brought into contact with the fabric guide 12 on the mounting portion 11 so as not to cut the edge of the fabric by the movable blade 8 to form a stitch of the stitch type 503. do. The stitches are formed as shown in FIG.
6b and further through the front side 16a, and the looper thread 17 is threaded from the front side 16a to the front side 16a, so after sewing is completed, by stretching the folded part as shown in Fig. 9, a decoration is made on the front side 16a of the fabric. A looper thread 17, which is a thread, is arranged, and a needle thread 1 is arranged on the back side of the fabric 16b.
5 is placed.

Note that this embodiment concerns the case of an overlock sewing machine with fixed overlock width specifications in which the position of the fixed blade 7 is set at a constant position, and therefore the mounting reference is set to the throat plate set screw and the right side of the throat plate. However, specifications in which the overlocking width can be adjusted can be accommodated by, for example, making the mounting portion coincide with the set screw portion of the fixed blade within the range that does not change the above-mentioned configuration.

(Effects) By attaching the guide ruler of the present invention as described above, when performing decorative stitching in the center of the cloth, it is possible to easily guide the cloth without removing or moving the movable blade. In addition, in the case where the overlock width is fixed, the guide ruler can be easily attached by positioning the guide ruler by bringing it into contact with the throat plate attachment portion and the outer shape of the throat plate.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is an external view of the guide ruler, FIG. 2 is an explanatory diagram of the cloth guide installed state,
Fig. 3 is a cross-sectional view of Fig. 2, Fig. 4 is an illustration of how the guide ruler is attached to the sewing machine, Fig. 5 is an illustration of the guide ruler attachment position, and Fig. 6 is an explanation of the engagement state of the attachment part. Figure 7 is an explanatory diagram of how to sew decorative stitches, Figure 8
The figure is an explanatory diagram of the state of seam formation, and FIG. 9 is an explanatory diagram of the seam formed in the center of the cloth, where 1 is the sewing machine frame, 4 is the bed surface, 5 is the throat plate, 6 is the presser foot, and 7 is an explanatory diagram of the seam formation state. 1 is a fixed blade, 8 is a movable blade, 11 is a mounting part, 12 is a cloth guide part, 13 is a positioning part, 6a is a safety cover, 1
4 is a cover portion of the movable blade, and 10 is a guide ruler.

Claims (1)

[Scope of utility model registration request] A throat plate is installed on the bed surface of the sewing machine frame so that it is almost flush with the bed surface, and a feeder that protrudes and retracts from a groove provided in the throat plate and works with the presser foot to feed the cloth. teeth, a fixed blade installed so that the cutting blade is located on the right side of the cloth feeding side of the needle drop point on the throat plate, and a driving means of the sewing machine in a state in which the cutting blade is in pressure contact with the right side of the fixed blade. and a movable blade that is moved up and down by a sewing machine, and as the sewing machine is driven, the fixed blade and the movable blade work together to cut the edge of the workpiece cloth and attach a hem to the edge of the cut workpiece cloth. In an overlock sewing machine that forms seams,
A plate-shaped attachment part disposed on the throat plate on the cloth feeding side of the presser foot, and a rising part of the attachment part on the right side of the cloth feeding side, the rising surface of which is closer to the needle side than the cloth cutting line. a cloth guide section that is set at a position; a positioning section that is a folded portion of the cloth guide section that abuts the right side surface of the throat plate; an extension section of the positioning section that is shaped to avoid the cloth presser; A guide ruler is provided which is an extension part and includes a cover part disposed immediately in front of the movable blade to prevent cloth from entering between the movable blade and the fixed blade, and the mounting part is configured to place the throat plate on the bed surface. A conical shape is formed that can be fitted into a conical groove for embedding a fixing screw, and the needle plate and cloth guide ruler can be integrally fixed to the bed via the conical groove by the screw. A cloth guide device for an overlock sewing machine, which is characterized by: