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1. (WO2018038154) SEAL STRUCTURE FOR OPTICAL FIBER DRAWING FURNACE, PRODUCTION METHOD FOR OPTICAL FIBER

Pub. No.:    WO/2018/038154    International Application No.:    PCT/JP2017/030102
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Thu Aug 24 01:59:59 CEST 2017
IPC: C03B 37/029
G02B 6/02
Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD.
住友電気工業株式会社
Inventors: OKAZAKI Iwao
岡崎 巌
YAMAZAKI Takashi
山崎 卓
YOSHIMURA Fumio
吉村 文雄
Title: SEAL STRUCTURE FOR OPTICAL FIBER DRAWING FURNACE, PRODUCTION METHOD FOR OPTICAL FIBER
Abstract:
A seal structure for an optical fiber drawing furnace, the seal structure being for sealing a gap between an upper-end opening part of the optical fiber drawing furnace and an optical-fiber glass base material that is inserted from the upper-end opening part. The seal structure comprises: a plurality of blade members that are provided so as to contact a circumferential-direction side surface of the optical-fiber glass base material; a guide member that houses the blade members and that movably supports the blade members; a push-pull action mechanism that moves the blade members in the radial direction of the optical-fiber glass base material; and a motion detection mechanism that detects when the motion of the push-pull action mechanism is complete.