JPH0659972B2 - Tension control for wire feeding and wire breakage detection method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for detecting a wire breakage while controlling the feeding tension of a 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, since the tension of the thin wire is small, the control of the feeding tension of the thin wire is inevitably expensive because high-precision control is required.

The disconnection is detected by attaching a rotary encoder such as a rotary encoder to the guide roller shaft of the wire to be drawn out, generating a pulse by the rotating shaft of the guide roller shaft, and electrically monitoring this pulse. However, 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]

In order to achieve the above object, in the present invention, when a conductive thin wire is paid out from a bobbin in an axial direction in a gathering machine or the like, a radial elastic string is circumferentially provided on a payout side flange of the bobbin. Attached at a required interval to the elastic cord, while feeding the thin wire while making contact with the elastic cord, the elastic cord is bent to apply tension to the thin wire, and at least one of the elastic cords is made conductive, and the elastic elastic cord is fed out. A constant DC voltage is applied between the thin wire and the thin wire, and an electric pulse is generated by the contact and separation of the thin wire and the conductive elastic cord, and the disconnection of the thin wire is detected by the presence or absence of this occurrence.

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

In addition, at least one conductive elastic string is sufficient,
When it is a feature, the interval is appropriate. This interval is also set appropriately in consideration of the pulse generation interval and the like depending on the delivery speed.

[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 / release, since the elastic cord is bent, a constant tension is applied to the disconnection due to the elastic force of the elastic cord.

Further, when the thin wire comes into contact with the conductive elastic string, a pulse signal is generated. If the generation is at a constant interval, the thin wire is normally fed out, and if it is not generated, the thin wire is broken. That is, the disconnection is detected by the presence or absence of the generated pulse.

〔Example〕

As shown in FIG. 1, a boss 11 made of a conductive metal is fitted into one flange 10 of the plastic bobbin B,
Radial elastic cords 12 are attached to the boss 11 at required circumferential intervals. Elastic string 12 is a pair of symmetrically placed one
Except for 2a and 12a, it is made of nylon tex, and the other 12a is a conductive elastic cord made of carbon fiber.

As shown in FIG. 3, a DC power source E and a pulse detector (short circuit detector) 13 are provided between the boss 11 and the bobbin B between the winding drum surfaces.
When the thin wire a is wound around the winding cylinder, the thin wire a is a bare wire, and therefore the pulse detector 13
The thin wire a is electrically connected to. Therefore, when the thin wire a comes into contact with the conductive elastic string 12a, both ends of the pulse detector 13 are short-circuited, which is detected as a pulse, and this detection signal t is input to the controller 14.

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 of the drawn thin lines a is drawn around the flange 10 as shown by the solid line → the chain line in FIG. 1, and comes into contact with or separates from the elastic cord 12 as it goes around. At the time of this contact / release, 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 conductive elastic string 12a, a pulse signal t is generated, and if the present invention has a constant interval, the controller 14 judges that the thin wire a is normally fed out and does not occur. For example, it is determined that the thin wire a is broken, an alarm is sounded, and the entire feeding operation (collecting machine) is stopped.

〔The invention's effect〕

Since the present invention is configured as described above, it is possible to perform both tension application to the drawn thin wire and detection of disconnection.

[Brief description of drawings]

FIG. 1 is a perspective view of a bobbin of an embodiment of a tension control and disconnection detection method according to the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, and FIG. 3 is a disconnection detection block diagram of the same embodiment. , FIG. 4 is an operation explanatory view. a ... fine wire, B ... bobbin, E ... DC power supply, 10 ... Flange, 11 ... Boss, 12 ... Elastic string, 12a ... Conductive elastic string, 13 ... Pulse detector, 14 ... Controller.

Claims (1)

[Claims] 1. When a conductive thin wire "a" is paid out from a bobbin B in an axial direction in a gathering machine or the like, elastic strings 12 in the radial direction of the bobbin B are provided on a payout side flange 10 at predetermined intervals in the circumferential direction. The elastic string 12 is attached and fed out while the thin line a is brought into contact with the elastic string 12, tension is applied to the thin line a by the bending of the elastic string 12, and at least one of the elastic strings a is made conductive. And a thin wire a
A constant DC voltage is applied between the thin wire a and the conductive elastic string 12, and an electric pulse is generated by the contact / separation of the thin wire a and the disconnection of the thin wire a according to the presence or absence of the present invention. A method for controlling the tension of a drawn thin wire and a wire breakage detection method.