Title:
APPARATUS FOR MEASURING THE DRAFT OF A ROLLED STEEL
Document Type and Number:
WIPO Patent Application WO/1988/002669
Kind Code:
A1
Abstract:
An apparatus for finding the draft of a rolled steel by measuring the moving speed of magnetic marks attached by magnetization to the strips on the input and output sides of a rolling mill, wherein the rise of a signal is used as a timing for detecting the magnetic mark on the input side, the signal being obtained by the logical product of a detecting signal of the input side and a gate pulse that opens with a magnetic mark detecting signal of the output side and that closes after an optimum period of time has passed, and wherein the comparator level of a detector is automatically changed depending upon the magnitude of the magnetic mark that is stored, in order to improve the S/N of magnetic mark signals of the input side and to reduce the erroneous detection as much as possible.
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Inventors:
Yamaoka
Masayoshi, Tsutsui
Kiyomi, Inoue
Tadashi, Takahashi
Toyoki
Masayoshi, Tsutsui
Kiyomi, Inoue
Tadashi, Takahashi
Toyoki
Application Number:
PCT/JP1987/000794
Publication Date:
April 21, 1988
Filing Date:
October 16, 1987
Export Citation:
Assignee:
NIPPON STEEL CORPORATION YAMAOKA
Masayoshi, Tsutsui
Kiyomi, Inoue
Tadashi, Takahashi
Toyoki
Masayoshi, Tsutsui
Kiyomi, Inoue
Tadashi, Takahashi
Toyoki
International Classes:
B21C51/00; B21B38/00; G01B7/00; G01B7/04; (IPC1-7): B21B37/00; B21C51/00; G01B7/04
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