JPH0234867B2 - TEIKOCHORYOKUSENJOTAINOCHORYOKUCHOSEISOCHI - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a tension adjusting device for a low tensile strength filament, and more specifically, a tension adjusting device for a low tensile strength filament, such as an optical fiber, which has an allowable tension of at most 2 to 30 grams. The present invention relates to a tension adjustment device for a low tensile strength filament.

(Prior Art) The prior art will be explained with reference to FIG. The filament 1 sent out from the delivery section is passed around a fixed dancer pulley 2, a movable dancer pulley 3, and another fixed dancer pulley 2, and then passed through a winding drive motor 9.
The film is wound onto a winding bobbin 8 which is rotationally driven by the winding bobbin 8.

The dancer movable pulley 3 is rotatably attached to one end of a rotating lever 4 that is rotatably supported around a fulcrum 7, and on the opposite side with respect to the fulcrum 7, a balance weight 6 can slide on the rotating lever 4. Installed like this. A rotary voltage regulator 5 is attached to the fulcrum 7 and adjusts the drive voltage of the take-up drive motor 9 that drives the take-up bobbin 8 in proportion to the rotation angle of the rotary lever 4 .

For example, if the tension increases due to fluctuations on the winding bobbin 8 side, the dancer movable pulley 3 will rise and the rotating lever 4 will rotate counterclockwise. Therefore, if the rotary voltage regulator 5 is set to lower the voltage of the winding drive motor 9 and the rotational speed of the winding bobbin 8 when the rotary lever 4 rotates around this direction, In response to the rise of the dancer movable pulley 3, the tension T in the filament body 1 is immediately lowered.

Now, if the tension when the filament body 1 is wound onto the winding bobbin 8 is set to a magnitude T, a force of magnitude 2T must always act on the center of the dancer movable pulley 3. However, since the striatum 1 has a low tensile strength, this 2T is a small value, so the entire weight of the dancer movable pulley 3 cannot balance this low set tension. For this reason, there is usually a balance weight 6 on the opposite side of the fulcrum 7.
is attached, and as shown in Fig. 3, the clockwise moment of the rotating lever 4 is offset by the counterclockwise moment of the balance weight 6, and the dancer movable pulley 3 is adjusted so that a predetermined small value 2T acts on it. It will be done.

(Problem to be solved by the invention) However, no matter how lightweight the dancer movable pulley 3 is made, the presence of the balance weight 6 increases the moment of inertia around the fulcrum 7 for this system as a whole. As a result, when the rotating direction of the rotating lever 4 is reversed in the process of tension adjustment, a large torque proportional to this moment of inertia is generated, and therefore a large tension is generated in the filament 1 based on this torque, which is an inconvenience. It was hot. Even if the mass of the balance weight 6 is reduced and the distance from the fulcrum 7 is increased instead, the moment of inertia cannot be reduced because the value of the moment of inertia is proportional to the square of the distance from the fulcrum. be.

(Means for Solving the Problem) In order to achieve the above object, the present invention includes a dancer fixed pulley, and a dancer fixed pulley, which is provided with a variable distance and rotatable around a single fulcrum by a rotary lever. The dancer pulley device is composed of a dancer movable pulley whose tension is to be adjusted, and the filament body whose tension is to be adjusted is routed between the dancer fixed pulley and the dancer movable pulley, and the rotary lever is connected to the filament body. A constant torque imparting device is provided to rotate in a direction opposite to the rotation direction due to tension, and a drive voltage of a winding bobbin for winding the filament is adjusted in proportion to the rotation angle of the rotation lever. The configuration includes a rotary voltage regulator.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2.

Since the overall structure of the dancer pulley device is the same as that described in connection with the prior art in FIG. 3, the driving relationship of the dancer movable pulley 3 will be mainly explained in this embodiment.

A hollow cylindrical bearing sleeve 15 is fixed to the base 10, and a rotation shaft 14 is attached to the bearing sleeve 15.
are coaxially and rotatably supported. A lever holding clamp 13 is fixed to one end of the rotation shaft 14, and the rotation lever 12 is attached thereto so as to extend in a direction perpendicular to the rotation shaft 14.

A dancer movable pulley 1 is attached to the end of the rotating lever 12.
1 is provided rotatably around its own axis. It is desirable that this dancer movable pulley 11 be made of light material and as lightweight as possible.

A dancer gear 21 is fixed to the other end of the aforementioned rotating shaft 14, a driven pinion 22 meshes with the dancer gear 21, and a suitable rotary voltage regulator 23 is attached to the shaft of the driven pinion 22. .

On the other hand, the base 10 is provided with a mechanism in which a suitable drive motor 16 rotates a constant torque clutch 19 via a drive pulley 17 and a driven pulley 18. The pinion 20 meshes with the previously mentioned dancer gear 21 to rotationally drive it.

The constant torque clutch 19 is, for example, a so-called hysteresis clutch, whose transmission torque can be adjusted to a desired constant value by adjusting the voltage from the outside.

In this invention, by the drive motor 16,
The direction of rotation of the dancer gear 21 via the constant torque clutch 19 is clockwise in FIG. is set in reverse.

Further, the setting torque of the constant torque clutch 19 is determined by the distance d from the center of the dancer movable pulley 11 to the rotation center of the rotation lever 12 (the center of the rotation shaft 14), and the setting tension of the filament body 1 as T. As, 2dT. In the claims, the constant torque applying device refers to the aforementioned drive motor 16, drive pulley 17, driven pulley 18, and constant torque clutch 1.
9. Drive pinion 20 and dancer gear 21;
This is a general term for devices that apply a constant torque of 2 dT to the rotating lever 12.

The above-mentioned distance d is set so that the torque value 2dT is approximately the middle value of the torque range that can be set by a normal constant torque clutch, taking into consideration the extremely small value of the tension T when the filament is an optical fiber. In, the first
It is best to select a fairly large size as shown in the figure.
Thus, the pivot lever 12 is a kind of torque magnifying lever for magnifying the small tension of the low tensile strength strand to a torque value that can be obtained with high precision by a conventional constant torque clutch.

Reference numeral 24 is a proximity switch for wire breakage detection, and when the wire body 1 is broken, the rotary lever 12 tilts significantly clockwise as shown by the broken line in FIG. This is a means of detecting and knowing the disconnection of the striatum 1.

Finally, to explain the voltage adjustment of the rotary voltage regulator 23, when the rotary lever 12 rotates clockwise in FIG. When the rotating lever 12 rotates counterclockwise in the direction of increasing the rotational speed of the drive motor to increase the tension of the filament 1, or vice versa, the rotational speed of the winding drive motor is similarly decreased and the tension of the filament 1 is increased. The direction is to reduce the tension.

From the above detailed description of the embodiments, the operation of the inventive device will be obvious. That is, if for some reason the tension of the filament body 1 becomes greater than the set value T, the dancer movable pulley 11 is pulled upward, and the rotating lever 12 is moved in the opposite direction by the constant torque applying device. It overcomes the applied counterbalancing torque and rotates counterclockwise. As a result, the dancer gear 21 rotates counterclockwise in FIG. 1, the drive voltage of the take-up drive motor is lowered, and the tension in the filament 1 is reduced, returning to the original set value T and returning to the balanced state. It will become.

(Effects of the Invention) In this invention, (i) since no balance weight is attached to the rotating lever that supports the dancer movable pulley, the moment of inertia of the entire system including the dancer movable pulley is reduced; (ii) A filament that does not apply excessive tension to the filament during the rotational movement of the rotation lever during tension adjustment, and can therefore be suitably used for a low tensile strength filament such as an optical fiber. The tension set on the body can be easily changed externally by changing the voltage of the constant torque clutch, so as in the conventional technology, the tension can be adjusted by stopping the operation of the device each time and moving the balance weight on the rotating lever. (iii) A configuration in which the tension in the striatum is expanded using a relatively long rotating lever to counteract a torque that is approximately in the middle of the torque range that can be set by an ordinary constant torque clutch. Therefore, there are effects such as accurate and stable tension control.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side sectional view, and FIG. 3 is a simplified front view showing the prior art. 11... Dancer movable pulley, 12... Rotating lever,
16... Drive motor, 17... Drive pulley, 18...
Driven pulley, 19... Constant torque clutch, 20...
Drive pinion, 21...dancer gear, 22...driven pinion, 23...rotary voltage regulator.

Claims (1)

[Claims] 1 A dancer fixed pulley, and a dancer movable pulley 1 which is rotatably provided around a single fulcrum by a rotary lever 12 and has a variable distance relative to the dancer fixed pulley.
1, and the filament body 1 whose tension is to be adjusted is a dancer pulley device which is passed around the dancer fixed pulley and the dancer movable pulley, and the rotation lever 12 is connected to the filament body 1. Constant torque applying devices 16, 17, 18, 19, 20, 2 provided to apply constant rotational force that is always set so as to rotate in the opposite direction to the rotation direction due to tension.
1, and in proportion to the rotation angle of the rotation lever 12,
and a rotary voltage regulator 23 that adjusts the drive voltage of a winding bobbin for winding the filament, and the distance d from the rotational fulcrum of the rotary lever 12 is determined by the winding of the filament. When the tension is T, the torque value is 2dT
is selected to have a value approximately in the middle of the torque range that can be set by the constant torque applying device, and furthermore, means capable of detecting breakage of the filamentous body due to an excessive inclination of the rotary lever 12. 24. A tension adjustment device for a low tensile strength filament, characterized in that a tension adjustment device is provided with a wire.