JPH0572237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Purpose of the Invention (Field of Industrial Application) The present invention is directed to an overlock sewing machine in which an empty yarn ring formed on a throat plate pawl connected to an end of a workpiece cloth is attached to the needle plate of the overlock sewing machine. This invention relates to an empty ring extracting device for extracting an empty ring from a 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 throat plate pawl. It is necessary to cut the work cloth and sew the empty ring connected to the needle and looper into the seam in the next sewing process (back-tuck). This work is usually performed as follows. First, pull out the hollow ring formed on the throat plate claw connected to the end of the work cloth from the throat plate claw, pass the hollow ring through the needle drop hole, and turn the work cloth towards you to stretch the hollow ring. The hollow ring is held in a hollow ring holder provided in front of the needle drop point, and the stretched hollow ring is cut. At this time, the hollow ring connected from the needle and the looper is held in a stretched state between the needle drop hole and the hollow ring holder. By placing the work cloth on top of this empty ring and starting sewing, the remaining yarn of the empty ring is sewn into the seam when sewing the next work cloth.

(Problem to be solved by the invention) However, since the work of extracting the empty ring formed on the throat plate claw from the throat plate claw has traditionally been done manually, it is also common that the throat plate claw is small. The work was extremely tedious.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems and easily and automatically perform the work of extracting the empty ring, the present invention provides a needle that moves up and down and a needle that corresponds to the needle. A needle hole is formed on one side of the throat plate and extends in the fabric feeding direction and opens toward the same direction, and a needle hole adjacent to the needle hole is provided. In an overlock sewing machine in which a thread ring is formed on the needle plate, there is provided a needle near the throat plate claw that is movable along the direction in which the thread extends, and that moves in the fabric feeding direction to pull out an empty thread ring on the throat plate claw. The structure is such that a pull-out body is provided.

(Function) Therefore, the hollow ring extracting device of the present invention removes the hollow ring formed on the throat plate claw by moving the extractor body provided near the throat plate claw in the cloth feeding direction along the throat plate claw. The ring is removed.

(Example) An example in which the present invention is embodied in a two-needle overlock sewing machine will be described below with reference to FIGS. 1 to 6.

As shown in FIG. 1, two needles 1a and 1b are provided on a frame (not shown) of an overlock sewing machine so as to be movable 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 throat plate 3 is attached to one side of the cloth support plate 2. The throat plate 3 has first and second throat plate claws 4 extending in the cloth feeding direction,
5 are formed in parallel, and at the side of the first throat plate claw 4 and between both throat plate claws 4 and 5, needles extending in the cloth feeding direction and in the same direction correspond to the needles 1a and 1b, respectively. First and second needle holes 6, 7 are formed which are open to the needle hole.

As shown in FIGS. 1 and 2, a base 8 is fixed to the machine frame on the cloth feeding side of the throat plate 3.
Its upper surface is disposed approximately on the same plane as the work cloth support surface. An empty ring presser plate 10 located on the upper surface of the base 8 is screwed and fixed to the tip of a bolt 9 inserted from the back side of the base 8, and is urged downward by a spring 11. The ring holding plate 10, the base 8, and the like constitute a ring holder 12. A cutter blade 14 for cutting the hollow ring 13 is fixed inside the base 8 with a screw 15.
14a indicates the cutting edge of this cutter blade 14. Further, the base 8 and the presser plate 10 each have a first
The opposing ends on the front and left sides of the figure are obliquely cut out to form an empty ring introducing groove 16.

As shown in FIGS. 1 and 3, a rotary solenoid 1 is mounted on the machine frame (not shown) near the throat plate 3.
7 is arranged, and the drive shaft 18 is provided with a connecting lever 1.
9 is attached. On the connecting pin 20 at the tip of the connecting lever 19, a pull-out body 21 extending in the cloth feeding direction on the lower surface of the needle plate 3 is supported at its base end, and the intermediate portion is guided by a guide means (not shown), and the tip The two needle holes 6 and 7 are
A pair of first and second extraction portions 22 and 23 are formed to be fitted from below. Then, normally, the rotary solenoid 17 is demagnetized and the extraction body 21 is placed on the cloth feeding side, and
When a pedal (not shown) is depressed, the rotary solenoid 17 is energized and the extracting body 21 is moved toward the cloth feeding side. Moreover, as shown in FIGS. 5a to 5c, the first and second extraction parts 22, 2
Guide slopes 22a and 23a for guiding the hollow ring 13 from the first needle hole 6 to the second needle hole 7 are formed on the cloth feeding side surface of 3, respectively.
The guide slopes 22a, 23a are formed to extend from the top to the bottom left in FIG.

Note that 24 shown in FIG. 1 and the like is an opening through which a feed dog (not shown) comes and goes.

Next, the operation of the empty ring extraction device constructed as above will be explained.

Now, during sewing, as shown in FIGS. 1 and 3, the rotary solenoid 17 is in a demagnetized state and the pull-out body 21 is placed on the front side by the action of its return spring, and the first and second The extraction parts 22 and 23 are located at the back (on the operator's side) of the first and second needle drop holes 6 and 7, respectively. At this time, the first and second extraction parts 22, 23
The needles 1a and 1b are moved up and down in front of the needles 1a and 1b to prevent them from colliding with each other. When the sewing is finished, as shown in FIG. 4, a series of hollow rings 13 are formed at the end of the work cloth C, one end of which is wrapped between the first and second throat plate claws 4 and 5. . When the pedal is pressed backward, the presser foot (not shown) is raised and the rotary solenoid 17 is energized. Therefore, as shown in FIG. , 7 along its two needle holes 6,
Move to the cloth feeding side opening of 7, and press the throat plate claw 4,
The empty ring 13 wrapped around the cloth 5 is pushed out to the cloth feeding side.

After that, when the work cloth C is pulled toward the front side (worker's side) and the empty ring is stretched, the empty ring is guided by the guide slope 22a of the first extraction part 22 and the opening of the second needle drop hole 7. position near the area. In this state, release the pedal and press the rotary solenoid 1.
When the operation of 7 is turned off, the extracting body 21 retreats to the cloth feeding side. By further pulling the work cloth C toward the front side when the extractor body 21 retreats, the empty ring is positioned at the front side of the needle drop hole 7 and biased toward the second throat plate claw 5 side. This action is due to the action of the guide slope 23a of the second extraction portion 23. As described above, the empty ring 13 can be pulled out from both needle plate claws 3 and 4 without requiring any manual work by simply depressing the pedal.

When the hollow ring 13 is drawn into the hollow ring holder 12 through the groove 16 in the stretched state, the hollow ring 13 is cut by the cutter blade 14 and separated from the work cloth C, and the needle and looper The empty ring remaining threads connected from the empty ring are stretched and held in the empty ring holder 12 in a state like a single thread. If the next work cloth is sewn in this state, the remaining threads of the empty loop will be sewn into the seams of the next work cloth.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can also be embodied in the following manner.

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

(2) The pedal and the pull-out body 21 are connected by a wire so that the pull-out body 21 can be moved by human power.

(3) A timer is set at the same time as the extraction body 21 is moved in the extraction direction, and the extraction body 21 is moved back when the time is up.

(4) Embodying this invention in an overlock sewing machine having one needle or three or more needles.

(5) Other arbitrary changes may be made to the shape, structure, etc. of each part without departing from the spirit of this invention.

Effects of the Invention As detailed above, according to the present invention, the excellent effect of easily and reliably extracting the hollow ring formed on the throat plate claw connected to the end of the work cloth is achieved. play.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment embodying this invention, Fig. 2 is a front view showing an empty ring retainer, and Fig. 3 is a front view showing an empty ring retainer.
The figure is a longitudinal cross-sectional view of the main part, Fig. 4 is a plan view showing the completed state of sewing, Figs. It is. Needles...1a, 1b, Throat plate...3, First throat plate claw...4, Second throat plate claw...5, First needle hole...
6. Second needle hole...7. Empty ring holder...12.
Empty ring...13, extracted body...21.

Claims (1)

[Claims] 1. Hands 1a, 1b that are moved up and down;
Needle drop holes 6 and 7 are formed on one side of the throat plate 3 to correspond to the needle drop holes 6 and 7 and extend in the cloth feeding direction and open when facing in the same direction, and the throat plate adjacent to the needle drop holes 6 and 7 In an overlock sewing machine which is equipped with claws 4 and 5, and in which a thread ring 13 is formed on the throat plate claws 4 and 5 during sewing, an overlock sewing machine is provided near the throat plate claws 4 and 5 along the direction in which they extend. An empty ring extraction device for an overlock sewing machine, characterized in that an extraction body 21 is movable and is adapted to extract empty yarn rings 13 on throat plate claws 4 and 5 by moving in the cloth feeding direction.