Sumitomo Electric Industries, Limited

Shigeru Suemori

Takehiko Okada

Yasushi Ito

Hiroki Ishikawa

Fumiaki Sato

Kazuhiro Hamada

Takashi Tanaka

Saburo Kawabata

Fumikazu Yoshizawa

Masakazu Watanabe

Masahiro Eguchi

Noboru Tokairin

Shigeki Yasui

Masahiko Ishikawa

Provided is a manufacturing method of an optical fiber ribbon for manufacturing an intermittent-connection-type optical fiber ribbon including a connection part and a non-connection part. The manufacturing method includes: a release agent applying process of intermittently applying a release agent for preventing optical fibers from being bonded to each other with a connection resin in a longitudinal direction of the optical fibers in a state where the optical fibers are arranged in parallel; and a connection resin applying process of allowing the optical fibers in the state of being arranged in parallel to pass through a die for applying the connection resin around the optical fibers after the release agent applying process, and of curing the connection resin.

Manufacturing method of optical fiber ribbon and manufacturing apparatus thereof

An apparatus for assembling an optical cable comprises a spacer paying-out portion , a stationary ribbon supply unit , a gathering portion and a taking-up portion . The spacer paying-out portion supplies a spacer having a spiral groove in the surface of a long spacer body from a supply reel while revolving around a line axis X-X. The stationary ribbon supply unit supplies a plurality of optical fiber ribbons . The gathering portion forms the optical fiber ribbons sent out of the stationary ribbon supply unit into a cable core by holding the optical fiber ribbons within the spiral groove of the spacer sent out of the spacer paying-out portion and running forward while rotating on its center axis. The taking-up portion winds the cable core on a taking-up reel while revolving around the line axis. A winding roller ( ) having an rotational direction identical to an rotational direction of the supply reel of the spacer and used for winding the spacer or the cable core is installed adjacently before and after the gathering portion whereby to revolve the winding roller around the line axis in synchronization with the revolution of the spacer paying-out portion . Accordingly, it is possible to prevent a twisting of the spacer in the gathering portion resulting from a winding habit of the spacer during a step of assembling cables.

Apparatus and method for assembling optical cable

The present invention relates to an extrusion coating apparatus having a structure which is capable of correctly forming and applying a coating layer with a desirable cross-sectional form even when thermal distortion occurs in its extrusion unit. This extrusion coating apparatus comprises an extrusion unit extruding a thermoplastic resin while heating the resin, a coating unit providing a coating layer of the thermoplastic resin from the extrusion unit around a linear body pulled at a predetermined tension, and various distortion-absorbing structures absorbing the distortion in the extrusion unit caused by heating the thermoplastic resin.

Extrusion coating apparatus

The present invention relates to an apparatus and method for making a slotted rod for an optical cable, which improves manufacturing efficiency, while alleviating the load applied to the apparatus. In the present invention, a rotatable die for forming a slot in a resin surface covering a tension member is rotated about the moving direction of the tension member such that the rotatable die alternately reverses its rotational direction for every predetermined reverse pitch of the tension member, and the tension member is alternately twisted in rotational directions opposite to the rotational directions of the rotatable die in synchronization with the rotation of the rotatable die.

Apparatus and method for making slotted rod for optical cable

In a method of manufacturing a self-support optical cable, a support wire and an optical cable body arranged in parallel are fed with each other; a sheath into an eight figure shape is extruded by an extruder to collectively coat the outer circumferences of the support wire and the optical cable body with the sheath, and thereafter, the self-support optical cable is cooled before hardening while the cable passes through a plurality of guide wheels so that an excess length is given to the optical cable body. In this method, the guide wheels are disposed in a cooling water tank in a manner so that a guide wheel contacting with one side of the self-support optical cable with the sheath in a softened state and another guide wheel contacting with the other side of the self-support optical cable with the sheath in a softened state are disposed alternately in the feed-out direction, said excess length is controlled based on the tension of the support wire, or the tension of said optical cable body at an inlet portion of said extruder is reduced by a tension reducing device.

Method of manufacturing a self-support optical cable

A tension control apparatus includes at least two guide rollers and at least one dancer roller disposed so as to be movable relative to said guide rollers, and applies a predetermined amount of tension to a linear body wound about the guide rollers and dancer roller. This apparatus has a tension control device for variably controlling the tension applied to the linear body by adjusting an angle between a vertical line and a line connecting respective rotational centers of the guide rollers and dancer roller.

Tension control apparatus

A method and apparatus for stranding tape-shaped optical fibers of the present invention strands a plurality of tape-shaped optical fibers each of which is constituted by a plurality of optical fibers arranged into a tape-shaped unit, wherein powder is applied onto at least one surface of each of said tape-shaped optical fibers in pathlines between supplying devices for supplying said tape-shaped optical fibers and a stranding die of said tape-shaped optical fibers.

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Osaka, Japan

Shigeru Suemori