JP2588464Y2 - Needle plate of overlock sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle plate of an overlock sewing machine.

[0002]

2. Description of the Related Art In an overlock sewing machine, winding an empty ring 2 into a stitch formed on the back surface of a cloth at the beginning of sewing is called "empty ring winding".

FIGS. 3 and 4 are top views showing the vicinity of a needle plate of a conventional overlock sewing machine. FIG. 3 shows a state where sewing is completed, and FIG. 4 shows a state immediately before the next sewing starts.

In these figures, a needle plate 6 fixed on a cloth base 4 has a middle claw 8 and an overlock claw 10. Behind the overlocking claw 10 in the cloth feeding direction of the sewing machine (above in FIGS. 3 and 4), there is provided a side cutter device 12 connected to an air suction / discharge device (not shown).
Inside, a side cutter knife 14 is provided. Further, an empty ring clamp mechanism including a cylinder 16, an empty ring clamp table 18, and an empty ring suction port 20 connected to an air suction device (not shown) is provided in front of the sewing machine in the cloth feeding direction (the lower part in FIGS. 3 and 4). ing.

[0005] The cloth W is held on the needle plate 6 by the cloth presser 22 during sewing, and the seam is formed while the side portion is cut by the knife 24.

After the sewing is completed, the hollow ring 2 emitted from the seam 26 of the cloth W is sucked into the side cutter device 12 by air suction from the side cutter device 12, and the side cutter knife 1
It is cut at 4.

After that, when the rotation of the sewing machine is stopped, as shown in FIG. 4, the air of the side cutter device 12 is fed backward, and the empty ring 2 in the side cutter device 12 is blown forward of the sewing machine, and the idle ring clamp mechanism is provided. Is sucked into the empty ring suction port 20 and further clamped by the empty ring clamp table 18 to be ready for the next sewing.

When the cloth for the next sewing is set and the sewing is started, the empty ring 2 is entangled in the seam formed on the back of the cloth at the start of sewing.

[0009]

When the air ring 2 in the side cutter device 12 moves forward (downward in FIGS. 3 and 4) of the sewing machine due to the reverse feeding of air, as shown in FIG.
It is blown off while drawing an arc around the claws 10. At this time, when the diameter of the empty ring 2 is large or the thickness of the empty ring 2 varies, the empty ring 2 is sewn with a needle thread when the empty ring 2 is entangled.
Cannot be pulled into the seam neatly, and it protrudes from the seam at the tip of the cloth to form a dumpling.

Accordingly, an object of the present invention is to provide a needle plate of an overlock sewing machine which does not catch on the inner claw 8 when the hollow ring is blown forward of the sewing machine even when the diameter of the hollow ring 2 is large. To provide.

[0011]

According to the present invention, to solve the above-mentioned object, according to the present invention, the other end of the hollow ring having an overhanging claw and a middle claw, one end of which is held by the middle claw, is blown forward of the sewing machine. A needle plate of an overlock sewing machine, wherein a protrusion protruding upward from the middle nail is provided behind the middle nail in such a manner as to be separated from the middle nail. .

[0012]

When the other end of the hollow ring, one end of which is held by the middle pawl, is blown forward of the sewing machine, the empty ring rides on the protrusion and is blown up once, so that it jumps over the middle pawl and moves forward. I do. Therefore, even when the thickness of the hollow ring varies, the hollow ring does not catch on the inner nail.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A needle plate of an overlock sewing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of a needle plate of an overlock sewing machine according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

In these figures, the needle plate 6 has elongated holes 28, 30 which allow a feed dog (not shown) to move up and down and to move back and forth.
, And an overlocking claw 10 and a middle claw 8 are formed around the needle drop. A projection 34 is formed in the space 32 behind the middle claw 8. As shown in FIG. 2, the protrusion 34 is provided so as to protrude above the inner claw 8.

The other parts of the overlock sewing machine to which the needle plate of this embodiment is attached can be the same as the conventional example shown in FIGS.

The other end of the hollow ring 2 whose one end is held at the tip of the overlocking claw 10 by blowing air from behind the sewing machine as shown in FIG. Is blown off in an arc shape in front of the sewing machine.
At this time, as shown in FIG. 2, the empty ring 2 rides on the protrusion 34 and is blown up once, so that it jumps over the inner claw 8 and moves forward of the sewing machine. Therefore, even when the thickness of the hollow ring 2 varies, the hollow ring 2 does not catch on the inner claw 8.

Although the needle plate of the overlock sewing machine of the present invention has been described based on one embodiment, the present invention is not limited to this embodiment and can be variously modified.

[0019]

According to the needle plate of the overlock sewing machine of the present invention, a projection is provided at the rear of the middle nail so as to be separated from the middle nail and project upward from the middle nail. When the other end of the held empty ring is blown off to the front of the sewing machine, the empty ring rides on the protrusion and is blown up once, so that it jumps over the middle claw and moves forward. Therefore, even when the thickness of the hollow ring varies, the hollow ring does not catch on the inner nail.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a needle plate of an overlock sewing machine according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a top view of a main part of an overlock sewing machine according to a conventional example, showing a state where sewing is completed.

FIG. 4 is a view similar to FIG. 3, showing a state immediately before the next sewing starts.

FIG. 5 is a top view showing a main part of a needle plate of a conventional overlock sewing machine.

[Explanation of symbols]

 2 Empty ring 4 Cloth base 6 Needle plate 8 Middle claw 10 Overlocking claw 12 Side cutter device 14 Side cutter knife 16 Cylinder 18 Empty ring clamp table 20 Empty ring suction port 22 Fabric holder 24 Female 26 Stitch 28, 30 Slot hole 32 Space Part 34 Projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A needle plate of an overlock sewing machine having an overlocking claw and a middle claw, and the other end of a hollow ring having one end held by the middle claw, is blown forward of the sewing machine. A needle plate for an overlock sewing machine, wherein a protrusion protruding above the inner claw is provided at a distance from the needle plate.