JPS6021001Y2 - Sewing machine yarn feeding abnormality detection device - Google Patents

Description

[Detailed description of the invention] This invention is a yarn feeding abnormality detection device for a sewing machine, and more specifically, a device for detecting yarn feeding abnormalities such as yarn breaks, skipped stitches, knots, and snags in the yarn feeding during operation of industrial or domestic sewing machines. Alternatively, the present invention relates to a device that detects a change in the number of decorative threads in advance.

The purpose of this invention is to intensively detect and control yarn feeding abnormalities such as yarn breaks, knots, snags, and fluctuations in the number of decorative threads in advance when the sewing machine is operating, and to activate the stop circuit. It is an object of the present invention to provide a simple device that not only can be operated and reduce work loss, but also can be easily installed in any sewing machine.

An embodiment of this invention shown in the drawings will be described below.

In FIG. 1, 1 is a control panel, and 11.21 is the control panel 1.
A first detecting section for thread breakage and skipping consists of a piezoelectric element 12 that can be freely connected to the plug 2 via a plug 2, and a second detecting section for knotting consists of a light source 22 and a photoelectric element 23; A third detecting section 41 is a light source 42 and a photoelectric element 43, which are connectable to the control panel 1 via the plug 2. This is the fourth detection unit for changing the number of decorative threads.

In the first detection section 11, a piezoelectric element 12 equipped with a yarn feeding slide guide piece 13 such as a wire is connected to a composite output circuit 3 via a signal amplification circuit 14 and a comparator 15 (see FIG. and Figure 2).

The second detection unit 21 includes a light source 22 and a photoelectric element 23 made of a phototransistor, etc., which are connected to the composite output circuit through a signal amplification circuit 24, a comparator 25, and a one-shot multi-circuit 26. 3 (see Figure 2).

In the third detection section 31, a microswitch 32 equipped with a lever 33 is connected to the one-shot multi-circuit 26 via a one-shot multi-circuit 34 (see FIGS. 1 and 2).

16.27.35 is the first to third detection section 11.2
1. Anomaly detection lamps connected to 31 and 36 are the third
A cutter connected to the detection unit 31 is shown.

The fourth detection section 41 includes a light source 42 and a photoelectric element 43 made of a solar cell or the like, which are arranged in opposition to each other. (See Figure 3)
.

47 is an abnormality detection lamp connected to the fourth detection section 41, and 4.5 is the first, second, and fourth detection sections 11, 21.4.
1 is a light emitting diode and a sensitivity adjustment knob, and A is a sewing thread.

Next, the operation of the device according to this invention will be explained.

First, the first to fourth detection sections 11, 21, 31, and 41 are respectively attached to the sewing thread running path.

Then, in the first detection section 11, the sewing thread A is slidably hooked on the thread feeding slide guide piece 13, and in the second detection section 21, the sewing thread A is positioned between the light source 22 and the photoelectric element 23 ( (See Figure 4).

In the third detection section 31, the sewing thread A is slidably hooked onto the lever 33 of the microswitch 32.

Further, in the fourth detection section 41, a light source 42 and a photoelectric element 4
Place the required number of decorative threads between 3 and 3.

Thereafter, when the sewing machine is operated, the sewing thread A1 and the decorative thread start traveling along a required travel path.

Then, in the first detection unit 11, the vibration of the sewing thread A sliding on the thread feeding slide guide piece 13 is detected by the piezoelectric element 12.
Therefore, it is converted into an electric signal, that is, a signal is emitted from the piezoelectric element 12, indicating the normal running of the sewing thread A.

Conversely, when thread breakage or skipped stitches occur in the sewing thread A, the tension applied to the thread feeding slide guide piece 13 disappears and the piezoelectric element 1
The signal from No. 2 stops, and the abnormality detection lamp 16 lights up to notify the yarn feeding abnormality.

In the second detection unit 21 , the shadow of the running sewing thread A is projected onto the photoelectric element 23 .

At this time, the projection is small in the case of normal sewing thread A, but the projection becomes large when it is knotted, and this projection change is converted into an electrical signal by the photoelectric element 23 to detect an abnormality in the thread feeding. The detection lamp 27 is turned on.

In the third detection unit 31, when the sewing thread A is caught on the lever 33 of the microswitch 32, the tension applied to the lever 33 acts as a dog and operates the lever 33, and a signal is output from the contact point and an abnormality is detected. The lamp 35 is turned on to notify of an abnormality.

Furthermore, in the fourth detection unit 41 , the shadows of the required number of running decorative threads are projected onto the photoelectric element 43 .

At this time, if there is an increase or decrease in the number of running decorative threads,
This change is converted into an electrical signal by the photoelectric element 43, and the abnormality detection lamp 47 is turned on to notify the abnormality.

The eleventh to fourth detecting sections 11, 21, 31
．． 41 detects an abnormality in the running sewing thread A1 decorative thread, the operation of the sewing machine is stopped or the operator is notified by a buzzer and light.

Then take the necessary measures.

Note that in the above embodiment, the first and second detection units 11
．． 21 has four pieces, and each of the third and fourth detection parts 31 and 41 has one side block, but the present invention is not limited to this, and an appropriate number can be provided depending on the yarn feeding path. be.

Furthermore, it goes without saying that a known machine operation stop circuit may be connected to the composite output circuit 3 to stop the machine operation at the same time as abnormality in yarn feeding is detected.

According to this invention, as described above, the yarn feeding slide guide piece 1
A first detecting section 11 for yarn breakage/stitching consisting of a piezoelectric element 12 equipped with 3, a second detecting section 21 for tying date consisting of a light source 22 and a photoelectric element 23, and a microswitch 32 equipped with a lever 33. The first, second, and fourth detecting sections 1 each include a third detecting section 31 for hooking, and a fourth detecting section 41 for varying the number of decorative threads consisting of a light source 42 and a photoelectric element 43.
1.21.41 are connected to the same output circuit 3 via signal amplification circuits 14, 24.44 and comparators 15, 25.45, respectively, while the third detection section 31 is connected to the output circuit 3. This makes it possible to centrally control and quickly and reliably detect yarn feeding abnormalities such as thread breaks, knots, snags, and fluctuations in the number of decorative threads in advance when the sewing machine is operating. Not only can losses be reduced, but the quality of sewn products can be significantly improved.

Further, the structure is extremely compact and not only easy to manufacture, but also easy to install in any sewing machine.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is a perspective view, FIG. 2 is a block diagram showing the first to third detecting sections 11, 21, and 31, and FIG. 3 is a block diagram showing the fourth detecting section 41. FIG. 4 is a block diagram showing the state of use. FIG. 3...Composite output circuit, 11...First detection section, 12...Piezoelectric element, 13...Yam feeding slide guide piece, 14.24. 44... Signal amplification circuit, 15, 25. 45... Comparator, 21... Second detection section, 22, 42...
・Light source, 23.43...Photoelectric element, 31...
...Third detection section, 32...Micro switch, 33...Lever, 41...Fourth detection section, A...Sewing thread.

Claims (1)

[Scope of utility model registration request] A first detection section 11 for thread breakage and skipped stitches, which is formed by a piezoelectric element 12 equipped with a thread feeding slide guide piece 13, and a second detection section for knots, which is formed by disposing a light source 22 and a light source element 23 facing each other. 21 and a microswitch 32 with a lever 33
a third detection section 31 for hooking, and a fourth detection section 31 for decorative thread variable, consisting of a light source 42 and a light source element 43 disposed facing each other.
The first, second, third, and fourth detecting sections 11, 21, 31, and 41 are each a signal amplifying circuit 1.
4, 24, 44 and comparators 15, 25, 45, which are connected to the same output circuit 3 with or without intervening therebetween.