JPH0615388B2 - Wire breakage detection method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for detecting an elastic line of a drawn thin wire.

[Conventional technology and its problems]

Various slip couplings are used to control the feeding tension when the filament is fed to a collecting machine or the like. However, the control of the feeding tension of the thin wire is inevitably expensive because a high-precision control is required because the tensile strength of the thin wire is small.

Further, the wire breakage is detected by mounting a rotary encoder such as a rotary encoder on the guide roller shaft of the filament to be fed, generating a pulse by the rotation of the guide roller shaft, and electrically monitoring the pulse. In these methods, the device is expensive, and tension control and disconnection detection are separate devices.

The present invention has been made in consideration of the above points, and an object thereof is to provide a method capable of performing tension control and disconnection detection at an extremely low cost, and performing both of them with a single device.

[Means for Solving the Problems of the Invention]

In order to achieve the above-mentioned object, in the present invention, when a thin wire is paid out from a bobbin in an axial direction in a gathering machine or the like, a radial elastic cord is required in a circumferential direction on a payout side flange of the bobbin. Attached at intervals, one of these elastic cords is not connected to the optical transmission line, light is input from one end of the optical transmission line, light is received from the other end, and the broken line of the thin line is detected by the received light signal. is there.

The required interval is appropriately set through experiments or the like based on the tension applied by contact.

[Action]

The present invention is constructed as described above, and the drawn thin wire is drawn around the flange, and comes into contact with and separates from the elastic cord as the wire goes around. At the time of this contact / disengagement, since the elastic cord is bent, a constant tension is applied to the thin wire by the elastic force of the elastic cord.

Also, when a thin wire comes into contact with the elastic cord made of an optical transmission line, the elastic cord bends and the light reception signal is cut off.If the pulse generation occurs at regular intervals, it means that the thin wire is normally fed out and does not occur. For example, it becomes a thin wire break. That is,
Disconnection is detected by the presence or absence of generated pulse.

〔Example〕

As shown in FIG. 1, a boss 11 is fitted into one flange 10 of the plastic bobbin B, and elastic strings 12 in the radial direction are attached to the boss 11 at required circumferential intervals. The elastic cord 12 is made of nylon tex, except for one piece 12a, and itself 12a is an optical transmission line elastic cord made of an optical fiber.

As shown in FIGS. 2 and 3, the optical transmission line 12a penetrates the boss 11, the light emitting diode 13 faces one end thereof, and the light receiving element 14 faces the other end thereof. A controller 15 is connected to the light receiving element 14. The positions of the light receiving element 14 and the light emitting diode 13 are reversed (the light receiving element 14 is set to the boss 1
1 side, the light emitting diode 13 may be fixed side).

This embodiment is configured as described above, and its operation will be described below.

As shown in FIG. 4, for example, when feeding a plurality of thin wires a to an aggregator (not shown), each bobbin B of the thin wires a is provided with an embodiment, and each thin bobbin B is set up with a thin wire a. Pay out.

Each thin wire a that is drawn out is drawn around the flange 10 as shown by the solid line in FIG. 1 → the chain line, and comes into contact with and separates from the elastic cord 12 as it goes around. At the time of contact / disengagement, the elastic cord 12 is bent as shown by the chain line in FIG.
A constant tension is applied to the thin wire a by the elasticity of.

Further, when the thin wire a comes into contact with the elastic string 12a of the optical transmission line,
The elastic cord 12 bends, and the optical transmission line 12a and the light receiving element 1
If the light receiving signal t is cut off due to the deviation of the optical axis of 4 and the light receiving signal t is generated at a constant interval, the controller 15 determines that the thin line a is normally fed out. When it is judged that the wire is broken, an alarm is sounded and the entire feeding operation (collecting machine) is stopped.

Since no electrical action is applied to the thin wire a, for example, no voltage is applied, there is no concern about discharge or the like, and there is no risk of scratching the thin wire a.

〔The invention's effect〕

Since the present invention is configured as described above, both tension application and disconnection detection can be performed at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a bobbin of an embodiment of the wire breakage detection method of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 3 is a wire breakage detection block diagram of the same embodiment, and FIG. FIG. a ... fine wire, B ... bobbin, 10 ... flange, 11 ... boss, 12 ... elastic string, 12a ... optical transmission line elastic string, 13 ... light emitting diode, 14 ... light receiving element, 15 ... Controller.

Claims (1)

[Claims] 1. When a thin wire is paid out from a bobbin in an axial direction of a gathering machine or the like, elastic strings in the radial direction are attached to a payout side flange of the bobbin at required intervals in the circumferential direction. A method for detecting breakage of a thin wire, which is characterized in that one is not an optical transmission line, light is input from one end of the optical transmission line, light is received from the other end, and a break in the thin line is detected by the received light signal.