JPH02231370A - Tension control method and break detecting method for delivered fine wire - Google Patents

Abstract

PURPOSE:To give tension to a fine wire very inexpensively by mounting to a delivery side flange of a bobbin in the peripheral direction an elastic cord giving by its flection the tension to the fine wire delivered while it is brought into contact with the elastic cord. CONSTITUTION:For instance, when two or more fine wires (a) are delivered to a collector, in each bobbin of the fine wire (a), it is delivered while turning around a flange 10 as shown by full-line chain-line, and the fine wire, as it turns around, comes into contact with and separates from elastic cords 12 provided in the flange 10 in the radial direction. At the time of these contact and separation, the elastic cord 12 is flexed as shown by the chain-line, so that the fine wire (a) is given fixed tension by elastic force of the elastic cord 12. By the constitution thus giving the tension to the fine wire (a) by the elastic cord 12, a device can be formed inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tension controlled IB method for feeding out a fine wire and a wire breakage detection method thereof.

[Prior art and its problems] When feeding a filament to a collection machine, etc., various types of slip force Sopring are used to control the feeding tension. However, since the tensile strength of the thin wire is small, control of the feeding tension of the thin wire requires highly accurate control and is therefore expensive.

In addition, wire breakage detection is carried out by attaching something like a rotary encoder to the guide roller shaft of the wire being fed out, generating pulses coaxially with the guide roller shaft, and monitoring these pulses electrically. However, in these methods, the equipment is expensive, and tension control and wire breakage detection are separate devices. The present invention has been made with the above points in mind, and an object of the present invention is to provide a method that can perform tension control and disconnection detection at extremely low cost, and can perform both with one device. [Means for Solving the Problems] In order to achieve the above object, in the tension control method according to the first invention, when a thin wire is fed out from the bobbin in the axial direction of the bobbin to a collecting machine or the like, On the feeding side flange,
Elastic strings extending in the radial direction were attached at required intervals in the circumferential direction, and the thin wire was fed out while being in contact with the elastic strings, so that tension was applied to the thin wire by the bending of the elastic strings.
The above-mentioned required spacing is determined as appropriate through experiments, etc., based on the tension applied by contact. Further, in the disconnection detection method according to the second invention, at least one of the elastic strings is made conductive, and a constant DC voltage is applied between the conductive elastic string and the m-wire to be paid out, A break in the thin wire was detected by the pulse generated when the thin wire came into contact with and separated from the conductive elastic string. Here, it is sufficient that there is at least one conductive elastic string, and if there is more than one, they should be spaced appropriately. This interval is also set appropriately, taking into account the pulse generation interval depending on the feeding speed. [Function] The present invention is constructed as described above, and the thin wire is fed out while going around the flange, and comes into contact with and separates from the elastic string as it goes around the flange. During this contact and separation, the elastic string is flexed, so that a constant tension is applied to the thin wire due to the elasticity of the elastic string. In addition, when a thin wire comes into contact with a conductive elastic string, a pulse signal is generated, and if this occurs at regular intervals, it means that the thin wire is being fed out normally, and if it no longer occurs, the thin wire is broken. That is, a disconnection is detected based on the presence or absence of a generated pulse.

〔Example〕

As shown in FIG. 1, a conductive metal boss 11 is fitted into one flange 10 of a plastic bobbin B.
Radial elastic strings 12 are attached to the boss 11 at required intervals in the circumferential direction. The elastic Mi 12 is made of nylon strings except for two 12a, 12a at symmetrical positions, and the other parts 128 are conductive elastic strings made of carbon fiber. As shown in FIG. 3, between the boss 11 and the winding drum surface of the bobbin B, a DC power source E, a pulse detector (short circuit detector) 13
When the thin wire a is wound around the winding rod, since the thin wire a is a bare wire, the pulse detector 13
Thin wire a is electrically connected to . Therefore, when the thin wire a contacts the conductive elastic string 12a, the pulse is detected 113 1
3 is shorted, which is detected as a pulse,
This detection signal t is input to the controller 14. This embodiment is constructed as described above, and its operation will be explained next. As shown in FIG. 4, for example, when feeding out a plurality of thin wires a to a collector (not shown), an embodiment is constructed on each pobbin B of the thin wires a, and the thin wire a is drawn from each pobbin B set upright. Bring it out. Each of the thin wires a is fed out while going around the flange 10 as shown in the solid line in FIG. During this contact/separation, the elastic string 12 is bent as shown by the chain line in Figure 1, so the elastic string 12
A constant tension is applied to the fine cotton a due to its elasticity. Furthermore, when the thin wire a comes into contact with the conductive elastic string 12a, a pulse signal L is generated, and if this generation occurs at regular intervals, the controller 14 determines that the thin wire a is being fed out normally, and the pulse signal L is no longer generated. If it is determined that thin wire a is broken, it will sound an alarm and stop the entire feeding operation (collecting machine). [Effects of the Invention] The present invention is constructed as described above, and since tension is applied to the thin wire using the elastic cord, it is inexpensive. In addition, if the elastic string is configured to be conductive, it is possible to both apply tension and detect disconnection.

[Brief explanation of the drawing]

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

Claims (2)

[Claims] (1) When feeding thin wire from a bobbin in the axial direction on a collecting machine, etc., radial elastic strings are attached to the feeding side flange of the bobbin at required intervals in the circumferential direction, and the thin wire is attached to the elastic strings. A method for controlling the tension of a thin wire being fed out, the method comprising feeding the thin wire while making contact with the thin wire and applying tension to the thin wire by bending an elastic string. (2) At least one of the elastic strings according to claim (1) is conductive, and a constant DC voltage is applied between the conductive elastic string and the thin wire to be fed out, and the thin wire and the conductive elastic string are connected to each other. A method for detecting a break in a thin wire fed out, characterized in that a break in the thin wire is detected by a pulse generated by contact separation.