JPS6326149Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to an improvement of a bobbin for detecting the remaining amount of bobbin thread in a sewing machine.

[Application field of this invention]

The bobbin for detecting the remaining amount of bobbin thread can also be used for bobbins of industrial and domestic sewing machines.

[Prior art]

As a device for detecting the amount of bobbin thread remaining in conventional sewing machines,
There is a publication No. 56-42959. This device allows a movable flange to slide on the axial cylinder part of a fixed flange, and determines whether light emitted from a light emitting diode is received by a phototransistor on the surface of the movable flange.The configuration of the bobbin is as follows: , a cylindrical pipe protrudes from inside the movable flange.

[Problems with conventional technology and their technical analysis]

In this conventional bobbin thread remaining amount detection device, if the bobbin thread is initially wound around the cylindrical pipe projected inside the movable flange, the movable flange will move toward the fixed flange, and the operator will be warned. The amount of bobbin thread becomes too small, and the goal is to make sure to notify the user before the thread in the bobbin runs out.
Helps the sewing work proceed smoothly. ” may not be fully achieved. Therefore, when winding the bobbin thread around the bobbin, it has to be wound from the smallest diameter part, and the operator has to be careful in winding each bobbin one by one.

[Technical issues]

Therefore, the technical problem of the present invention is to integrally form a truncated cone portion toward the concave bobbin section on the inside of both flanges so that the bobbin winding start always fits into the concave bobbin section. .

[Technical means]

The technical means taken to solve the above technical problem is to integrally provide a truncated conical part on the inner side of both flanges of the bobbin, the truncated conical part being lowered toward the middle of the flanges, A concave groove portion is provided between the two truncated conical portions to ensure the final amount of the bobbin thread.

[Effect of technical means]

The technical means works as follows. That is, no matter where you start winding the bobbin thread onto the bobbin of the device of the present invention, the bobbin thread will slip from either the truncated conical portion 11 of the fixed flange 1 or the truncated conical portion 22 of the movable flange 2.
It falls into the concave groove 12 of the fixed flange and comes into close contact with it, and winding can be started from there. The bobbin thread is gradually wound, and the movable flange 2 is pushed by the wound bobbin thread and moves to a position where it is stopped by the retaining ring 3, and the thread is wound thereon (Fig. 5). From this state, the bobbin thread As the thread is consumed, as shown in FIG. 3, the bobbin thread remaining in the groove 12 of the fixed flange 1
If the movable flange 2 protrudes even slightly from the outer peripheral surface of the shaft cylindrical portion 13, the movable flange 2
The light emitted from the light emitting diode 17 inserted in the detection part 15 is reflected on the side surface of the movable flange 2 because it cannot slide on the shaft cylinder part 13 and is in a fixed position. The angle of reflection of the light emitted from the light emitting diode 17 is such that the position of the movable flange 2 can be confirmed at all times by being received by the phototransistor 18 inserted in the phototransistor 18. θ, FIG. 4 shows a case where a small amount of bobbin thread remains in the groove 12 provided in the fixed flange 1, and the movable flange 2 presses the axial cylinder portion 13 of the fixed flange 1 against the pressing spring (see FIG. (not shown), the reflection angle of the light emitted from the light emitting diode 17 inserted into the detection section 15 increases to θ', and the phototransistor 18 cannot receive the light and the remaining amount of the bobbin thread decreases. The system notifies the operator of the replacement.

[Special effects produced by the present invention]

The present invention produces the following unique effects. In other words, there is no need to pay much attention to the position at which to start winding the bobbin thread, and winding can be started automatically from any predetermined position, just like a conventional bobbin, and the remaining bobbin thread length is small. Since a certain amount of time is secured, when the notification is received in the middle of sewing, it is possible to know how much time is left to be sewn, and the sewing work can proceed smoothly. Furthermore, when used with a horizontal rotary hook equipped with an automatic bobbin winding device, the bobbin of the present invention can be even more effective because the bobbin winding start is always inserted into the groove.

〔Example〕

The fixed flange 1 has a flange portion 1 from one end,
A truncated conical portion 11, a concave groove 12, a shaft cylinder portion 13, and a retaining ring groove 14 into which the retaining ring 3 is fitted are arranged in a row, and the movable flange 2 has a flange portion 21 and an inclined portion 22. Furthermore, the movable flange 2 is slidably inserted onto the axial cylindrical portion 13 of the fixed flange 1, and then the retaining ring 3 is inserted into the retaining ring groove 14 provided at the tip of the axial cylindrical portion 13 of the fixed flange 1. The movable flange 2 is assembled so that it does not fall off. The tips of a light emitting diode 17 and a phototransistor 18 are integrally fitted in the detection unit 15 with an angle maintained at θ°, and the incident angle of the light emitted from the light emitting diode 17 and the side surface of the flange portion 21 of the movable flange 2 are set. The phototransistor 18 is mounted so that the reflection angle at which the phototransistor 18 receives light is the same. When the bobbin thread is sufficiently wound around the bobbin, the clearance between the side surface of the flange portion 21 of the movable flange 2 and the end surface of the shaft cylinder portion 13 of the fixed flange 1 is X.
When there is a shortage of bobbin thread and a notification is required, the dimension X increases to X'.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the assembled state of the bobbin of the present invention, Fig. 2 is a perspective view of the bobbin of the present invention assembled, and Fig. 3 is a vertical sectional view showing the assembled state of the bobbin of the present invention.
The figure is a vertical cross-sectional view showing a state in which the detection unit has determined that there is “lobbin thread remaining”, and FIG. The plan view and FIG. 5 are longitudinal cross-sectional views showing a state in which the bobbin thread is completely wound around the bobbin of the present invention. 1... Fixed flange, 2... Movable flange, 1
1, 22... truncated cone portion, 12... concave groove, 13...
Shaft cylinder part.

Claims (1)

[Scope of utility model registration request] One of the flanges at both ends of the bobbin is a movable flange that can slide along the axial cylinder portion of the bobbin, and the other flange at both ends of the bobbin is a fixed flange, so that the distance between the flanges can be varied. In the bobbin for detecting remaining amount, a truncated conical part is integrally provided on the inside of both flanges of the bobbin and is lowered toward the middle of the flanges, and a truncated conical part is integrally provided on the inner side of both flanges of the bobbin. A bobbin for detecting the remaining amount of bobbin thread for a sewing machine, characterized in that the bobbin is provided with a concave groove portion for ensuring the final amount of bobbin thread.