JP2002274880A - Process and apparatus for adjusting turning pulley in optical fiber drawing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a turning pulley in an optical fiber drawing equipment. SOLUTION: In the process and apparatus for adjusting a turning pulley in the optical fiber drawing equipment, the running position of an optical fiber 1 on the turning pulley 2 is adjusted by rotating the turning pulley 2 around a virtual axis OP, provided that P is the contact with the vertical line in contact with the circumferencial surface of the pulley at the center in the width direction of a flat groove of the turning pulley 2, and O is the center in the width direction of the axis of rotation of the turning pulley 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for adjusting a direction changing pulley in an optical fiber drawing apparatus.

[0002]

2. Description of the Related Art First, the meaning of adjusting a direction change pulley in an optical fiber drawing apparatus will be described with reference to FIG. The optical fiber 1 drawn in a vertical direction from the base material is coated with the primary and secondary coatings twice, and the traveling direction is changed by the direction changing pulley 2 in the horizontal direction to the winding device.

Just as it is necessary for the optical fiber to be drawn in the vertical direction, this direction changing step is inevitable. This is because human life on the ground has a horizontal spread, and therefore both factory buildings and electric wire machines are horizontal, which spreads almost horizontally.

Now, a specific adjustment state will be described with reference to FIGS. 5 and 6 showing a conventional direction change pulley device. A pulley having a flat groove is used for the optical fiber 1 in order to avoid a situation in which the optical fiber is rotated and twisted while being pressed against the inner wall surface of the groove during the lateral movement in the groove. The groove is adjusted so as to pass through the center P substantially in the width direction of the direction changing pulley 2.

Conventionally, for this adjustment, an adjustment bolt 4 for mounting a bracket 4 for supporting the directional change pulley 2 is provided.
This is done by tightening either A or 4B.

[0006]

However, if the adjusting bolt 4B is tightened, for example, the direction changing pulley 2 will be entirely shown in FIG.
Tilt to the left, although the optical fiber 1 is certainly adjustable in the width direction of the center P ₁ of the inclined state of the turning pulleys 2, coating with the coating apparatus in the upward moving path line of the optical fiber 1 A disadvantage that adversely affects the process occurs.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to the first aspect is directed to a flat groove of a directional change pulley in an optical fiber drawing apparatus. At the center in the width direction, a contact point with a vertical line contacting the outer peripheral surface of the pulley is denoted by P, and a center point in the width direction of the rotation axis of the direction changing pulley is denoted by O, and the direction changing pulley is moved around an imaginary axis OP. The turning position of the optical fiber on the turning pulley is adjusted by rotating the pulley to adjust the turning pulley in the optical fiber drawing apparatus.

According to a second aspect of the present invention, there is provided an optical fiber drawing apparatus, wherein a direction changing pulley is provided by a supporting base and a rotating abutment of the virtual axis O.
An optical fiber which is supported so as to be rotatable only around P, and is configured to rotationally drive the support base around the virtual axis OP via a gear or projection provided on the support base. It is a direction change pulley adjustment device in a drawing device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concept of the method of the present invention will be described with reference to FIG. It is assumed that the traveling direction of the optical fiber 1 is changed from vertical to horizontal by the direction changing pulley 2. The rotation shaft 3 of the direction change pulley 2 is attached to a support base 5 via a bracket 4.

It is assumed that the optical fiber 1 running in the vertical direction at the center in the width direction of the direction changing pulley 2 is in contact with the outer peripheral surface of the pulley, and this contact point is P. Also, the center of the axis of the rotating shaft 3 in the pulley width direction is O.

Now, a straight line OP connecting the point O and the point P is considered as a virtual rotation axis, and the direction changing pulley 2 is
In this case, the position of the contact point P between the optical fiber 1 and the direction change pulley 2 does not move during the rotation adjustment, so that the conventional inconvenience is eliminated. This is the principle of the present invention.

As an actual device, a cylinder having a radius R with the axis OP as the central axis is imagined, and a part of the support base 5 is formed so as to match the arc-shaped wall surface 5A of the cylinder. It is sufficient that the table 5 is restrained and supported by the rotating support 6 so as to move only in the direction along the arc 5A.

FIGS. 2 and 3 show a specific embodiment of the present invention. That is, the support base 5 is a rotating support 6
Thus, it is restrained and supported in a sandwiched state so that it can rotate only in a direction along the arc-shaped wall surface 5A.

Thus, the worm 7 is engaged with the worm gear 51 provided on a part of the support base 5 as shown in the drawing, or the reference numeral 51 is used as an ordinary spur gear (not shown). The support base 5 may be rotationally driven by the motor M by meshing with another spur gear.

[0015]

According to the present invention, the angle of the diverting pulley with respect to the optical fiber is adjusted by setting the point of contact with a vertical line in contact with the outer peripheral surface of the pulley at the center in the width direction of the flat groove of the pulley as P, and Since the rotation is performed by rotating the deflecting pulley about the axis OP with the center point in the width direction of the rotation axis being O, the adjustment can be performed without changing the optical fiber pass line, and there is a concern that the coating process will be adversely affected. There are advantages such as not.

[Brief description of the drawings]

FIG. 1 is a sectional side view illustrating the principle of the method of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a schematic view for explaining the operation of a direction change pulley in an optical fiber drawing process.

FIG. 5 is a side view for explaining a conventional direction changing pulley adjusting method.

FIG. 6 is a front view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical fiber 2 Direction change pulley 3 Rotating shaft 4 Bracket 4A, 4B Adjustment bolt 5 Support base 51 Gear 52 Projection 5A Arc-shaped wall surface 6 Rotation support 7 Worm P Contact point between optical fiber and direction change pulley

Claims (2)

[Claims] 1. A contact point between a vertical line contacting the outer peripheral surface of a pulley at the center in the width direction of a flat groove of a direction changing pulley (2) in an optical fiber drawing apparatus is denoted by P, and rotation of the direction changing pulley (2). The running position of the optical fiber (1) on the direction change pulley (2) is determined by rotating the direction change pulley (2) about the virtual axis OP with the center point in the width direction of the axis being O. A method for adjusting a direction changing pulley in an optical fiber drawing apparatus, comprising adjusting. 2. A directional change pulley (2) in an optical fiber drawing apparatus is restrained and supported by its support base (5) and a rotation support (6) so as to be rotatable only around the virtual axis OP. An optical fiber configured to rotate the support base (5) about the virtual axis OP via a gear (51) or a projection (52) provided on the support base (5). Direction change pulley adjustment device in drawing equipment.