JPS62186893A - Method and apparatus for detecting residual yarn of bobbin 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 [Field of Industrial Application] The present invention relates to a method and a device for equipping a bobbin of a sewing machine with a sensing device and detecting the amount of thread remaining on the bobbin thread by the detection of the sensing device. be.

``Prior art'' Conventionally, the bobbin thread remaining amount detection means for this type of sewing machine was developed in the 1970s.
As disclosed in Japanese Patent Publication No. 9-8696, Japanese Patent Publication No. 59-41813, etc., in both cases, the only option is to detect when a considerable amount of bobbin thread remains, and to replace the bobbin when a considerable amount of thread remains. It was uneconomical.

``Problem to be solved by the invention'' As mentioned above, conventionally, the bobbin is replaced with the next bobbin with a considerable amount of thread remaining, and then the next sewing starts. As mentioned above, the bobbin has a considerable amount of remaining yarn, which results in unnecessary consumption of the yarn, resulting in a huge economic loss. The present invention aims to eliminate such waste of yarn, and this is an object of the present invention.

"Means for Solving the Problem" The present invention is intended to achieve the above-mentioned object, and a sensing device is interposed in the bobbin, and based on the thickness of the remaining thread in the inner thread winding part of the bobbin, the exposure of the thread winding part, etc. It is possible to know the amount of thread remaining or the state in which the bobbin winding part is exposed due to a very small amount of thread remaining, and in the case of sensing rod detection, confirm that the sensing rod has been removed from the hook. This allows the sewing machine to rotate and also allows the positioning of the sensing rod to be checked at the same time, making every effort possible to detect the amount of thread remaining.

``Embodiments and Effects'' Now, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, which show an example of implementing the present invention.

1 is a bobbin, the thread 2 is inserted into the bobbin case 3 in a twisted state, and the hook shaft 1 is moved by the transmission from the sewing machine drive source.
6 and rotates in synchronization with the sewing machine. 2 is a thread, and 3 is a bobbin case. 4 is a throat plate, and 5 is a sensing rod, which detects the remaining amount of thread 2 using the electric circuit shown in FIG. 3 and the timing chart shown in FIG. 6 is a sensing rod guide plate with a sensing rod insertion hole provided at its tip.

7 is an insulating plate, 8 is a block (top), 9 is a current-carrying wire for sending current between the electrodes to the sensing rod 5, 10 is a lever, and a fulcrum 22
The sensing rod 5 is moved in the direction of arrow A using an electric signal as the center. 11 is a block (bottom), and 12 is a drive cylinder, which serves to operate the lever 10 with an electric signal. 13
is a position confirmation switch, which serves to confirm whether the sensing rod 5 is inserted into the bobbin case 3 or not, and to measure work safety. 14 is the position confirmation switch line, 15
The hook shaft 16 is held by the hook base. 16 is the hook shaft, 1
7 is a sensing rod insertion hole, 18 is a set screw for lever 10, 19
2 is a moving lever fulcrum plate, and 20 is an adjustment nut, which is provided so that the drive cylinder 12 can be adjusted.

21 is a cylinder shaft, and 22 is a fulcrum for swinging the lever shaft 10. Furthermore, in FIG. 3, 23 is a reset, 24 is a start switch, 25 is a position confirmation switch,
26 is an l-cycle end switch, 27 is a bobbin exchange signal, 28 is a solenoid valve for the sensing rod drive cylinder, 29 is a one-shot multivibrator, and 130 indicates the rotation of the sewing machine.

``Effects of the Invention'' As described above, the present invention provides a detection device in the bobbin, detects the amount of remaining yarn by measuring the thickness of the wound yarn, and furthermore, detects the amount of yarn remaining in the bobbin when there is no yarn in the winding part of the bobbin. By detecting this point and knowing that there is a very small amount of thread remaining, we can replace the bobbin, so we can reduce the waste of thread left on the bobbin to a minimum, and save time every month. It has a significant economic effect.

[Brief explanation of drawings]

The attached drawings show an example of the implementation of the present invention, and FIG. 1 is a front view of the device, FIG. 2 is a perspective view thereof, FIG. 3 is an electric circuit diagram related to the device, and FIG. 4 is a timing diagram of the device. It is a chart diagram. 1--Bobbin, 2--system, 3-bobbin case, 4-throat plate, 5--sensing rod, 6--sensing rod guide plate, 7--insulating plate, 8--block (top), 9- live wire, 10-1.
Lever, 11-Block (lower), 12-Drive cylinder-113-Position confirmation switch, 14-Position confirmation switch cord, 15-Kick base, 16-Kick shaft, 17-Sensing rod insertion hole, 18-Lever stop Screw, 19--Moving lever fulcrum plate, 20--111 adjustment nut, 21...
Cylinder axis, 22... - fulcrum, arrow A - sensing rod movement direction, 23 - reset, 24... start switch,
25--Position confirmation switch, 26--1 cycle end switch, 27--Bobbin replacement signal, 28--Sensing rod drive cylinder solenoid valve, 29-One-shot multivibrator-130--Sewing machine rotation. Applicant Yamato Sewing Machine Manufacturing Co., Ltd. (and 2 others) Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A method for detecting remaining thread on a bobbin for a sewing machine, which comprises detecting and reporting a state when the thread winding portion of the bobbin is exposed. 2. A bobbin remaining thread detection device for a sewing machine, characterized in that an energized sensing rod that can move forward and backward is inserted into the bobbin and is placed opposite to the thread winding section of the bobbin. 3. A bobbin remaining thread detection device for a sewing machine, characterized in that a photoelectric device is interposed between the inner surface of the bobbin case and the thread winding portion of the bobbin. 4. A switch is installed on the energized sensing rod that allows it to move forward and backward.
The sensing rod is activated when the sewing machine is stopped, and when it comes into contact with the thread wound on the bobbin or the exposed surface of the bobbin, the sensing rod stops moving forward and backward, and the tip of the sensing rod A bobbin remaining thread detection device for a sewing machine, characterized in that the remaining amount of bobbin thread can be detected by reading the position.