JPH022300Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a device for suctioning and removing thread waste and fabric waste generated during operation of an overlock sewing machine.

[Conventional technology]

Conventionally, devices for suctioning and removing thread waste and cloth waste have arranged separate suction bodies so that the suction ports are close to the respective waste generation areas, and two suction tubes connected to these suction bodies are used to remove waste. It is connected to the box and uses a vacuum pump to suck the air from which lint and fabric waste has been removed in the waste box.In particular, the lint suction port that sucks up lint is connected to the needle on the needle plate where lint is generated. It is placed close to the hole and behind the thread trimming knife that operates in relation to the main shaft.
A cloth suction port for sucking cloth scraps is arranged behind the well-known cloth cutting knife of the overlock sewing machine (see FIGS. 1, 3, and 4 for the arrangement position).

[Problem that the invention attempts to solve]

As mentioned above, the thread waste suction port is placed close to the needle hole, but since the feeding device, needle bar device, cloth guide plate, etc. of the overlock sewing machine are located in this area, the thread waste suction port is located close to the needle hole. The opening area of the
It has to be made extremely small compared to the opening area of the lint suction port, and for this reason, even if air is sucked in with a vacuum pump, the suction force at the lint suction port is not sufficient. Even if you suck the thread waste into the thread trimming scalpel located in front of the thread waste suction port and apply it to the blade of the scalpel, the tension of the thread due to suction is not sufficient and the thread becomes slack, so thread trimming is not necessary. In some cases, the movement was incomplete (Figure 4).

This invention was made in order to solve such conventional problems, and the purpose is to increase the suction force of the lint suction port by reducing or stopping the suction from the lint suction port when lint is generated. .

〔Example〕

Next, an embodiment of the present invention will be described based on FIGS. 1 and 2. Reference numeral 1 denotes an overlock sewing machine that performs overlock stitching, which is attached to a sewing machine table 2. A main shaft is rotated by a drive motor (not shown), and a feed dog is operated in conjunction with the rotation of the main shaft.
The needle, thread knife 3, and well-known fabric knife 4 (Figs. 3 and 4) move up and down. The thread knife 3 is disposed close to the needle hole 5 on the side of the overlock sewing machine perpendicular to the feeding direction. Reference numeral 6 denotes a cloth stand placed at the same height as the sewing machine table 1, and a light emitting element 7 placed close to the cloth stand 6 in parallel with the direction orthogonal to the needle hole 5 and the cloth feeding direction is attached to the cloth stand 6 so as to emit light upward. A light-receiving element 8 for detecting the light-receiving element 7 is mounted on the sewing machine frame so as to be vertically opposed to the light-emitting element 7. When the cloth is not detected by the light-emitting element 7 and the light-receiving element 8, that is, after the end of the cloth passes through the light-emitting element 7, empty loops (lint waste) connected to the cloth are generated, as will be described later. Naturally, this cloth detection means is used as a thread waste generation detection means, and its detection signal is processed as a thread waste generation signal.

Reference numeral 9 denotes a thread waste suction body which is attached to the fabric stand 6 with a thread waste suction port 10 opening laterally at one end disposed behind the thread knife 3 and its base end disposed at the rear in the cloth feeding direction. One end of the suction tube 11 is connected to.

Reference numeral 12 denotes a fabric waste suction body having a fabric waste suction port 13 at one end, which is disposed close to the sewing machine main body 1 side perpendicular to the feeding direction from the well-known fabric scalpel 4 attached to the overlock sewing machine 1. It is supported within the table 1 with a cloth suction port 13 opening upward, and one end of a suction tube 14 is connected to the base end of the sewing machine table 2 from below.

Reference numeral 15 denotes a waste box with the other ends of both suction tubes 11 and 14 connected to the upper end surface, and a porous filter material 16 is disposed within the sealed waste box parallel to the upper end surface.

Reference numeral 17 is a pump connecting pipe that opens one end below the filter/material 16;
and is connected to the vacuum pump 18 by passing through the upper end surface of the waste box.

19 is a rotary solenoid arranged on the upper end surface of the waste box 15;
An opening/closing valve 20 interlocked with the valve 9 is installed in the waste box 15 so as to close the suction pipe 14 connected to the cloth suction body 12 when energized and opens when the energization is deenergized.

The thread waste suction body 9 is formed into an elongated shape and is sandwiched between the needle bar drive mechanism, cloth presser mechanism, and cloth guide plate mounted on the overlock sewing machine, and the opening area of the thread waste suction port 10 that opens into this body is narrow. is formed in a small area according to the thread waste suction body 9. On the other hand, the opening area of the cloth suction port 13 is large so that it can be opened above the sewing machine table 2 without any restrictions on the opening surface area, and in order to suck up cloth scraps larger than thread scraps, There is a large difference in opening area compared to the lint suction port 10. Therefore, when air is simultaneously sucked from both suction ports 10 and 13 by the vacuum pump 18, the suction force is stronger at the cloth suction port 13, which has a larger opening area, and the suction force at the lint suction port 10, which has a smaller opening area, is become weak.

Next, the control means of this embodiment will be explained based on the block diagram shown in FIG. 5. When the start switch of the sewing machine 1 is turned on, the sewing machine driving motor and the vacuum pump 18 are activated. Next, when the pedal switch is turned on, the sewing machine is driven and the needle moves up and down, and when there is cloth to be sewn, the cloth detector is turned on, the rotary solenoid 19 is turned off, and the cloth detector is turned on.
When the rotary solenoid 19 is turned OFF and turned ON, the cloth suction pipe 14 is closed.

The operation of this embodiment having the above configuration will be explained with reference to FIG. 6.

Turn on the start switch of sewing machine 1, and with suction being applied from both suction ports 10 and 13,
Place it on the cloth table 6 and turn on the pedal switch.
The light receiving element 8 detects the cloth A and issues a cloth detection signal, so the rotary solenoid 19 is turned off and the suction tube 14 is opened. The cloth scalpel 4 of the sewing machine 1 cuts the edge of the sewing cloth A in a straight line along the cutting line L, and moves the sewing cloth A in the feeding direction using the feed dog while cutting the edge using the needle and the looper. The cloth waste B cut by the cloth scalpel 4 is suctioned through the adjacent cloth suction port 13 and removed into the waste box 15 (FIG. 3).

Next, the overedge stitching is completed and sewing fabric A is placed at needle hole 5.
(FIG. 4), the needle thread and looper thread intertwine with each other to form an empty ring K. At this time, the light receiving element 8 detects that the cloth A has passed and issues a signal indicating that the cloth A is not above the needle hole 5, that is, an empty ring (lint waste) is generated, so the rotary solenoid 19 is turned ON and the cloth waste is removed. Since the side suction pipe 14 is closed by the on-off valve 20, air is suctioned only from the lint suction port 10, creating an attractive suction force. Therefore, the empty ring K constituted by the sewing thread is drawn to the thread waste suction port 10, and the empty ring K that is attached to the thread knife 3 is pulled by the thread waste suction port 10 and becomes tense, and the thread knife 3, and the cut empty ring K is sucked into the thread waste suction body 9 as thread waste and removed into the waste box 15. Then, even if the pedal switch continues to be turned on and empty loops K occur one after another, they are similarly sucked into the thread waste suction body 9 as thread waste while being cut by the thread knife 3.

Furthermore, in this state, when the next sewing cloth A is placed on the cloth table 6 and overlocking begins, the light receiving element 8 detects the sewing cloth A and turns off the rotary solenoid.
Therefore, by opening the cloth suction pipe 14 again, air is suctioned from the cloth suction port 13, and the cloth B cut by the cloth scalpel 4 is suctioned.

As the sewing progresses in sequence as described above, the above operations are repeated.

〔effect〕

The structure of the present invention works as described above. Conventionally, even if an empty ring occurs, the suction force is weak, so cutting with a thread scalpel may be defective. There were cases where the rings were stuck to each other without being cut, but this device can increase the suction power of these empty rings, making it possible to prevent such defects from occurring and improve the sewing machine. It is possible to continue sewing cloth one after another while the machine is running, and the work progresses smoothly, improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a perspective view showing the waste box in the same figure, Figures 3 and 4 are views showing the state in which sewing cloth A is being sewn, Figure 5 is a control block diagram, and Figure 6 is a table of the same operation. be. 1... Overlock sewing machine, 2... Sewing machine table, 3... Thread knife, 4... Cloth knife, 5... Needle hole, 6... Cloth stand, 7... Light emitting element, 8... Light receiving element, 9 ... Lint waste suction body, 10 ... Thread waste suction port, 1
1, 14... Suction pipe, 12... Cloth suction body, 13
...cloth suction port, 15...waste box, 16...filter material,
17...Pump connection pipe, 18...Vacuum pump.

Claims (1)

[Scope of Claim for Utility Model Registration] Thread waste and fabric waste generated during operation of an overlock sewing machine are suctioned separately by a fabric waste suction port and a thread waste suction port formed with a smaller area than the fabric waste suction port. The apparatus includes a suction adjustment means for reducing or stopping suction of cloth waste, a detection means for detecting generation of lint and generating a lint generation signal, and a means for receiving the lint generation signal. A swarf removal device for a sewing machine, comprising: a control means for controlling a suction adjustment means, the suction adjustment means being activated when thread waste is generated to reduce or stop the suction action of cloth waste.