US 4,521,931 AGranted

Method for threading filaments on rollers of oxidizing furnace and apparatus therefor

AssigneeToray Industries, Inc.

InventorsKosuke Katsuki, Youiti Nishioka, Susumu Nomura

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Abstract

A method and apparatus for threading acrylic filaments on rollers of an oxidizing furnace, wherein (a) the atmospheric temperature in the furnace is maintained at 180.degree. C. to the oxidizing temperature, (b) the tips of said filaments are fastened to a filament-fastening bar spanning a pair of chains which engage chain wheels provided at both ends of each roller freely rotatable against the roller, (c) the chains are moved, thereby said filament-fastening bar attached to the chains being moved from the entrance to the exit of the furnace and the filaments being threaded on the rollers, and (d) the moving speed of the chains is controlled with progress of heat-treating of the filaments so as to match the behavior of shrinkage and elongation of the filaments.

Claims17

Dependent claims

A method for threading acrylic filaments on one roller after another of an oxidizing furnace by moving said filaments from the entrance to the exit of said oxidizing furnace, said method comprising:

(a) maintaining an atmospheric temperature in said oxidizing furnace at 180.degree. C. to an oxidizing temperature;
(b) fastening the tips of said filaments to be threaded to a filament-fastening bar spanning a pair of right and left chains which engage chain wheels attached at the both ends of each roller freely rotatable against said roller and turn in a zigzag manner around one chain wheel after another from said entrance to said exit of said oxidizing furnace;
(c) moving, under said atmospheric temperature, said paired chains and said filament-fastening bar attached to said chains from said entrance to said exit of said oxidizing furnace and threading said filaments on the rollers while said filament-fastening bar turns successively around said rollers;
and
(d) controlling the moving speed of said chains with progress of heat-treating of the filaments so as to match the behavior of shrinkage and elongation of said filaments during the movement of said chains from said entrance to said exit of said oxidizing furnace.

2 more elements

An apparatus for threading acrylic filaments on rollers of an oxidizing furnace wherein there are a series of first rollers and a series of second rollers with a spacing to said first rollers, and on said first rollers and said second rollers are successively threaded said filaments which are partly embraced by said oxidizing furnace maintained at 180.degree. C. to an oxidizing treatment temperature, said apparatus comprising:

(a) a pair of chain wheels provided at the both ends of each of said rollers freely rotatable against said rollers;
(b) a pair of chains which engage successively said chain wheels at the both ends of each of said rollers and turn in a zigzag manner around one roller after another;
(c) a chain-drive means to move said chains from the entrance to the exit of said oxidizing furnace;
(d) limit switches located to match the shrinkage and elongation behavior of said filaments within said oxidizing furnace, said limit switches acting with progress of said chains;
(e) a working rod provided as one part of said chains and serving to manipulate said limit switches;
(f) a filament-fastening bar installed between said paired chains;
and
(g) a speed control means to adjust the speed of said chains driven by said chain-drive means according to the changing behavior of said filaments, based on signals issued from said limit switches worked by said working rod.

5 more elements

Dependencies are inferred from the claim text.