Apparatus and method for making slotted rod for optical cable
AssigneeSumitomo Electric Industries, Ltd.
InventorsShigeru Suemori, Takehiko Okada, Shigeki Yasui
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Abstract
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.
Claims3
A method of making a slotted rod for an optical cable, said method comprising the steps of:
- introducing into an extruder a tension member, said extruder having a head portion with a space into which a molten resin is injected in a state where said tension member penetrates therethrough, and providing a rotatable die at a resin extruding orifice of said head portion;
- and
- rotating said rotatable die, during when the resin covering said tension member is being extruded from said head portion, about a moving direction of said tension member such that said die alternately reverses the rotational direction thereof for every predetermined reversing pitch of said tension member and twisting said tension member alternately in rotational directions opposite to the rotational directions of said rotatable die in synchronization with the rotation of said rotatable die.
Dependencies are inferred from the claim text.