JPH0817866B2 - Empty ring extractor for overlock sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an overlock sewing machine having a plurality of needles, which is connected to an end portion of a work cloth and extends between a plurality of needle plate claws. The present invention relates to an empty ring withdrawing device for withdrawing an empty thread ring to be formed from the needle plate claw.

(Prior Art) Generally, in an overlock sewing machine, an empty thread ring (hereinafter referred to as an empty ring) is formed between the end of the work cloth that has been sewn and the needle plate claw. It is necessary to cut the work cloth and pull the empty ring connected to the needle and the looper into the stitch in the next sewing (back tack). This work is usually performed as follows. First,
While pulling out the empty ring formed on the needle plate claw that is continuous with the end of the work cloth from the needle plate claw and passing the empty ring through the needle drop hole,
The work cloth is turned to the front and the hollow ring is stretched and held by a hollow ring retainer provided in front of the needle drop point, and the stretched blank ring is cut. At this time, the empty ring connected from the needle and the looper is held in a stretched state between the needle drop hole and the empty ring retainer. By placing the work cloth on the empty ring and starting sewing, the empty ring residual thread is pulled into the stitch when the next work cloth is sewn.

(Problems to be solved by the invention) However, since the work of pulling out the empty ring formed on the needle plate claw from the needle plate claw and passing it through the needle drop hole has conventionally been performed manually, the needle plate claw and needle The work was very troublesome because of the small holes.

Configuration of the Invention (Means for Solving the Problems) This invention solves the above problems and easily and automatically performs the empty ring withdrawing work. A plurality of needle drop holes which are formed on one side of the needle plate so as to correspond to the respective needles and which extend in the cloth feed direction and open toward the same direction, and a plurality of needle plate adjacent to the respective needle drop holes. In an overlock sewing machine that includes a claw and a thread ring is formed between the needle plate claws with sewing,
An extractor that is arranged near the needle plate claw and is movable in the cloth feed direction, and with the movement of the extractor, it moves in each needle drop hole to extract an empty thread ring between the needle plate claws. Department,
A guide slope is provided in the extraction portion and guides the extracted empty thread ring to one needle drop hole.

(Operation) Therefore, according to the empty ring extracting device of the present invention, the extracting body provided in the vicinity of the needle plate claw moves in the cloth feeding direction along the needle plate claw so that the extracting part moves in the needle drop hole. The empty thread ring formed on the needle plate claw is reliably pulled out. Then, the extracted empty thread ring is brought closer to one needle drop hole side by the guide slope provided in the extraction portion. Then, when the work cloth is turned toward you (worker side) while stretching out the extracted empty ring, the empty ring is guided along the guide slope of the extraction body to the front of the specified needle drop hole, and the extraction body is further retracted. Along with this, the needle is guided deep into the hole.

(Embodiment) An embodiment in which the present invention is embodied in a two-needle overlock sewing machine will be described below with reference to FIGS.

As shown in FIG. 1, a machine frame (not shown) of an overlock sewing machine is provided with two needles 1a and 1b capable of moving up and down. A cloth support plate 2 whose upper surface is a work cloth support surface is attached to the machine frame, and a needle plate 3 is attached to one side thereof. On the needle plate 3, first and second needle plate claws 4 and 5 extending in the cloth feeding direction are formed in parallel, and the first needle plate claw 4 is formed.
Between the side portions of the needle plate and the needle plate claws 4 and 5, the first and second needle drop holes 6 and 7 extending in the cloth feed direction and opened in the same direction as the needles 1a and 1b, respectively. Are formed.

As shown in FIGS. 1 and 2, a base 8 is fixed to the machine frame on the cloth feeding side of the needle plate 3, and the upper surface of the base 8 is arranged substantially flush with the work cloth supporting surface. An empty ring pressing plate 10 located on the upper surface of the base 8 is screwed and fixed to the tip of the bolt 9 inserted from the back surface side of the base 8, and is urged downward by a spring 11. An empty ring retainer 12 is constituted by the empty ring pressing plate 10, the base 8 and the like. The base 8
A cutter blade 14 for cutting the empty ring 13 is screwed inside
It is fixed by 15. Reference numeral 14a indicates the cutting edge of the cutter blade 14. Further, the base 8 and the pressing plate 10 are notched obliquely at the opposite end portions on the front side and the left side in FIG. 1, respectively, and an empty ring introducing groove 16 is formed.

As shown in FIGS. 1 and 3, a rotary solenoid 17 is arranged in a machine frame (not shown) near the needle plate 3, and a connecting lever 19 is attached to a drive shaft 18 thereof. . A pull-out body 21 extending in the cloth feed direction is supported at the base end of the lower surface of the needle plate 3 at the base end of the connecting pin 20 at the tip of the connecting lever 19, and the middle portion is guided by guide means (not shown), There is formed a pair of first and second extraction portions 22 and 23 which are fitted into the needle drop holes 6 and 7 from below. Then, normally, the rotary solenoid 17 is demagnetized so that the extraction body 21 is arranged on the cloth feeding side, and when the pedal (not shown) is stepped on backward, the rotary solenoid 17 is excited and the extraction body 21 is moved to the cloth feeding side. It Further, as shown in FIGS. 5A to 5C, empty rings 13 are respectively provided from the first needle drop holes 6 on the surfaces of the first and second extraction portions 22 and 23 on the cloth delivery side. Guide slopes 22a, 23a for guiding to the second needle drop hole 7 are formed. The guide slopes 22a and 23a are formed so as to extend from the upper side to the lower left side in FIG.

Reference numeral 24 shown in FIG. 1 and the like is an opening for a feed dog (not shown) to project and retract.

Next, the operation of the air ring extracting device configured as described above will be described.

Now, during execution of sewing, as shown in FIGS. 1 and 3, the rotary solenoid 17 is in the demagnetized state, and the action of the return spring thereof causes the extraction body 21 to be arranged on the front side. The withdrawal portions 22 and 23 are located in the inner portions (worker side) of the first and second needle drop holes 6 and 7, respectively. At this time, the needles 1a and 1b are moved up and down on the work cloth feeding side with respect to the first and second unloading portions 22 and 23 to prevent mutual collision. When the sewing is completed, as shown in FIG. 4, an empty ring 13 is continuously formed at the end portion of the work cloth C, and one end thereof is wound between the first and second needle plate claws 4 and 5. When the pedal is stepped back, the work clamp (not shown) rises and the rotary solenoid 17 is excited. Therefore, as shown in FIGS. 5 (a) to 5 (c), the extraction body 21 is horizontally moved in the cloth feeding direction, and the first and second extraction portions 22 and 23 at the tips thereof are moved to the first and second positions. It moves along the needle drop holes 6 and 7 to the cloth feed-out side openings of both needle drop holes 6 and 7, and the empty ring 13 wound between the needle plate claws 4 and 5 is pushed out to the cloth feed side. At this time, the empty ring 13 is brought closer to the second needle drop hole 7 side by the action of the first and second extraction portions 22a and 23a.

After that, when the work cloth C is pulled to the front side (worker side) and the empty ring 13 is extended, the empty ring 13 is guided by the guide slope 22a of the first extraction portion 22 and the opening of the second needle drop hole 7 is performed. Positioned near the section. In that state, release the pedal and turn off the operation of the rotary solenoid 17.
21 retracts to the fabric feeding side. By further pulling the work cloth C toward the front when the extractor 21 is retracted, the empty ring 13 is positioned in the inner depth of the second needle drop hole 7. This action is due to the action of the guide slope 23a of the second extracting portion 23. At this time, the empty ring 13 is positioned on the second needle plate claw 5 side of the second needle drop hole 7. As described above, the empty ring 13 can be moved to the both needle plate claws without any manual work by simply depressing the pedal rearward.
The hollow ring 13 is pulled out from 3, 4, and then the hollow ring 13 is naturally guided into the needle drop hole 7 by simply rotating the work cloth toward the front while stretching the hollow ring 13.

Then, when the empty ring 13 is pulled into the holder from the groove 16 of the empty ring holder 12 in the stretched state, the empty ring 13 is cut by the cutter blade 14 and separated from the work cloth C, and the needle and the looper The empty ring residual yarn continuous from is stretched and held in the empty ring retainer 12 in a state like a single yarn.
If the next processed cloth is sewn in this state, the empty ring residual thread is surely sewn into the seam of the next processed thread.

The present invention is not limited to the above embodiment, but can be embodied in the following modes.

(1) Use other driving means such as a linear solenoid or an air cylinder as a means for driving the movement of the extraction body 21.

(2) The pedal and the extraction body 21 are connected by a wire so that the extraction body 21 can be moved manually.

(3) The extraction body 21 is moved in the extraction direction, and at the same time, a timer is set, and the extraction body 21 is returned and moved by the time up.

(4) In the above embodiment, the withdrawal portions 22 and 23 are provided in the needle drop holes 6 and 7, but the withdrawal portions are not provided in the needle drop holes into which the empty ring is introduced.

(5) Others The shape, configuration, etc. of each part may be arbitrarily changed without departing from the spirit of the present invention.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the empty ring formed on the needle plate claw that is continuous with the end of the work cloth is extracted,
It has an excellent effect that it can be easily and reliably guided to the needle drop hole.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment embodying the present invention,
2 is a front view showing the empty ring retainer, FIG. 3 is a longitudinal sectional view of an essential part, FIG. 4 is a plan view showing a sewing completed state, and FIG. 5 (a).
~ (C) is a plan view of a main part showing an empty ring extracting process, and Fig. 6 is a plan view showing the empty ring cutting. Needles 1a, 1b, needle plate 3, first needle plate claw 4, second needle plate claw 5,
First needle drop hole 6, second needle drop hole 7, empty ring retainer 12, empty ring
13, extraction body 21, extraction portion 22, guide slope 22a.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Masahiro Fukushima 9-35 Hotta-dori, Mizuho-ku, Nagoya, Aichi Prefecture Brother Industries, Ltd. (56) Reference JP-A-60-29183 (JP, A) JP Sho 63-79695 (JP, A) Actually opened Sho 62-39682 (JP, U)

Claims (1)

[Claims] 1. A plurality of needles (1a, 1b) that are vertically moved integrally.
And a plurality of needle drop holes (6, 6) formed on one side of the needle plate (3) so as to correspond to the respective needles (1a, 1b) and extending in the cloth feeding direction and opening toward the same direction. 7) and a plurality of needle plate claws (4,5) adjacent to each needle drop hole (6, 7), and a thread ring (13) is provided between the needle plate claws (4,5) during sewing. In the overlock sewing machine configured to be formed, the withdrawal body (21) disposed near the needle plate claws (4,5) and movable in the cloth feed direction, and the movement of the withdrawal body (21) , A pull-out portion (22) that moves in the needle drop hole (6) and pulls out the empty thread ring (13) between the needle plate claws (4,5), and a pull-out portion (22) that is provided and pulled out. The guide slope (22
a) An empty ring take-out device for an overlock sewing machine characterized by being provided with and.