JPS62249690A - Bobbin yarn residual amount detector of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention sends a signal of the amount of remaining thread to a sewing person using a lockstitch sewing machine, a sewing machine using a lockstitch sewing machine, etc. before the thread on the bobbin completely runs out during sewing. It is related to the device.

Generally, when sewing with a lockstitch sewing machine, you can see the amount of needle thread remaining during sewing, but the bobbin thread is wound around a small bobbin and attached to the bottom of the sewing machine, and the remaining amount of bobbin thread is used to sew. I can't see inside.

Therefore, if you run out of thread while sewing the decorative stitches that appear on the surface of the sewn product, you will have to cut off all of the thread that has been sewn halfway and start sewing again from the beginning. If the sewing product has long dimensions, the sewing efficiency will be very poor. In leather products, vinyl products, etc., needle holes occur and defective sewn products occur. Also, needle thread breakage may occur.

The present invention has been made in order to solve the above-mentioned problems in sewing with conventional lockstitch sewing machines, and its purpose is to provide a peephole for the reflecting plate of the bobbin installed in the bobbin case attached to the hook of the sewing machine. The detector detects the reflector on the bobbin and sends the signal to the control circuit. When the control circuit receives the set number of signals, the bobbin thread shortage lamp lights up and the sewing machine At the same time as informing
This is an innovative bobbin thread remaining amount detection device for a sewing machine that can send a signal to the sewing machine that uses this sewing machine to stop the machine and prevent the occurrence of defective sewn products.

Hereinafter, the configuration of a bobbin thread remaining amount detecting device for a sewing machine embodying the present invention will be described in detail with reference to the drawings. The control device 1 can be mounted on the upper part of the sewing machine 8 in a position that does not adversely affect the sewing work and makes it easy to see the amount being sewn. The control device input electric wire 5 is connected to the transmission machine main power switch 4 of the sewing machine, and the detector 2 is attached to the hook 6 in a position where the peephole 9 of the reflector plate of the bobbin 8 placed in the bobbin cage 77 can be seen. .

Figure 2 shows a control device 1 with a built-in control circuit and display components.
It is. When the control circuit power switch 11 attached to the control device l is turned on, electricity flows through the control circuit, the control circuit lamp 12 lights up, the detector 2 is not in a detectable state, and the numeric display lamps 14 to 17 also light up. do. Attach the bobbin case 7 containing the bobbin 8 of the present invention wound with thread to the hook 6,
When the numbers displayed on the number display lamps 14 to 17 are set using the addition switch 18 or the subtraction switch 19 for each number, the machine becomes ready for sewing. The displayed number is the number of revolutions of the bobbin from when the detector 2 detects the reflector 10 attached to the bobbin 8 until the thread wound around the bobbin 8 runs out.

When sewing with Tetoron filament No. 60 thread, the number of times the reflective plate 10 attached to the bobbin 8 is detected is approximately 125 times, so the number displayed on the numerical display rande 14 can be adjusted by operating each addition switch 18 and subtraction switch 19. 5, the number displayed on the numeric display lamp 15 is 2, the number displayed on the numeric display lamp 16 is 1, and the number displayed on the numeric display lamp 17 is 0.

During sewing, when the detector 2 detects the reflective plate 10 attached to the bobbin 8, the bobbin thread remaining amount warning lamp 21 lights up, and from then on, the number display lamp 1 lights up as many times as the detector 2 detects the reflective plate 10.
The displayed number of 17 is subtracted from 4, and the number display lamp 1
When all the displayed numbers from 4 to 17 become O, the bobbin thread shortage lamp 22 lights up to send a signal to the sewing person and also to the sewing machine using this sewing machine. When the bobbin thread shortage lamp 22 lights up, by replacing the bobbin with a new one and pressing the set number return switch 13, the numbers from number display lamps 14 to 17 will return to the actual set number, and the bobbin thread remaining amount caution lamp 21 The topobin thread shortage lamp 22 goes out.

20 shows the detection sensitivity adjustment knob of the detector 2.

Figures 3 to 6 show the relationship between the detector 2 and the thread 23 wound around the bobbin 8 of the present invention, which is attached to the bobbin K-S 7. Figure 3 shows the bobbin with the thread wound and its state when replaced. The detector 2 cannot detect the reflective plate 10 attached to the grain bin 8 due to the interruption of the bobbin thread 23.

FIG. 4 shows the state when all the threads of the large thread winding part 25 wound around the bobbin 8 of the present invention are used.
The reflection plate 10 cannot yet be detected due to the interruption of the light.

FIG. 5 shows the thread of the small thread winding section 24 wound around the bobbin 8 of the present invention.
This is a state in which the reflector 10 is used to a point where it can be seen, and the detector 2 can detect the reflector 10.

When the detector 2 detects the reflector 10, the bobbin 71-i remaining amount warning lamp 21 lights up, and the numeric display lamp 14 changes to 1.
The number 7 is subtracted.

Figure 6 shows the state when the numbers in the number display lamps 14 to 17 are all 0 and the bobbin thread shortage lamp 22 is lit. Set the number 17.

Figures 7 and 8 show a bobbin 8 of the present invention with a reflecting plate 10 attached thereto, which has a small thread winding part 24 and a large thread winding part 25. There is a peephole 9t. When winding thread around this bobbin 8, the thread is wound around the small thread winding section 24 first. By providing this small pin winding portion, the present invention can provide a device with less error in the detector and superior detection accuracy.

FIG. 9 shows the bobbin 8 of the present invention installed at the bobbin rotation speed 7,
The reflector 10 attached to the bobbin can be seen through the peephole 9.

As described in detail above, the present invention includes a control device l having a built-in control circuit and a display device, a detector 2, a bobbin 8 having a small bobbin winding 24, a large bobbin winding section 25, and a reflecting plate 10. It is made up of.

When the thread wound on the large thread winding section 25 and the thread wound on the small thread winding section 24 are used halfway, the bobbin thread remaining amount warning lamp 21
When the detector 2 detects the reflector 10 by the number set in the numerical display lamps 14 to 17, the bobbin thread shortage lamp 22 is turned on and a signal is sent to the sewing person. This device also sends a signal to the sewing machine to prevent the occurrence of defective sewn products.

By inventing the bobbin 8 that has a small thread winding section 24 and a large thread winding section 25, when changing the thread used during sewing, even if the bobbin is replaced with a bobbin that uses thread halfway, the reflective plate can be blocked in the small thread winding section. If there is enough thread left to do so, accurate detection is possible. Furthermore, since the present invention is an invention in which control is performed by counting the number of detections after the detection of the reflector begins, the remaining amount of bobbin thread can be adjusted according to the sewing length of the sewn product, so that the bobbin thread shortage lamp 22 lights up during sewing. However, by setting the numbers from 14 to 17 in the number display lamps so that the length of thread remains that can be sewn to the end, it is possible to prevent the occurrence of defective sewn products.

In addition, the present invention is not limited to the bobbin 8 having the small thread winding part and the large thread winding part of the above embodiment, but also a generally used bobbin by attaching a reflecting plate to the bobbin 8, so that the bobbin of the present invention can be made to have a smaller winding than when the bobbin of the present invention is used. Although the detection accuracy is poor, it can be used in the device of the present invention without any problems.

As described in detail above, the present invention is a unique device that is extremely superior in improving the quality and efficiency of sewn products.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the device 1 of the present invention when it is installed on a sewing machine.
FIG. 2 is a perspective view of the control device, and FIGS. 3 to 6 are front views showing the relationship between the amount of bobbin thread remaining during sewing and the detector.
Fig. 7 is a left side view and a front view of the bobbin of the present invention, Fig. 8 is a perspective view of the bobbin of the present invention, and Fig. 9 is a front view of the bobbin of the present invention inserted into the bobbin case and the reflecting plate of the bobbin visible. be. 1......Control device 8...Bobbin 10...Reflector plate

Claims (1)

[Claims] It has a small thread winding part on one side and a large thread winding part on the other side,
A reflective plate is provided on the side plate of the large spool, and the outer diameter of the separating plate between the small spool and the large spool is slightly smaller than the outer diameter of the side plates of the small spool and the large spool. When sewing a bobbin with a reflective plate peephole, when all the thread from the medium-large spool is used and the thread from the small spool is used halfway, the detector installed under the sewing machine detects the bobbin's reflective plate. The sewing machine detects the reflector through the peephole, and when the number of detections reaches the number of detections set in advance on the numerical display lamp, the bobbin thread shortage lamp lights up and also sends a signal to stop the sewing machine. Bobbin thread remaining amount detection device.