Journal of the Horological Institute of Japan
Online ISSN : 2432-1915
Print ISSN : 0029-0416
ISSN-L : 0029-0416
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Volume 126
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1988 Volume 126 Pages Cover1-
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_Cover1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1988 Volume 126 Pages Cover2-
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_Cover2
    JOURNAL FREE ACCESS
    Download PDF (30K)
  • Longitudinal Collision of two Acrylic Bars
    Tatsuo NARABAYASHI, Yasuo JIMBO
    Article type: Article
    1988 Volume 126 Pages 1-12
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_1
    JOURNAL FREE ACCESS
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    Longitudinal collisions of elastic bars are treated. One bar which is called free-free bar has two free ends. Another bar which called fixed-free bar has a fixed end and a free end. The free-free bar strikes thd free end of the fixed-free bar, and the impact force produced by this collision is analysed and observed. In order to make a fixed end, an acrylic bar is used and its end is fixed to a large steel block. As the elastic modulus of the steel is about 50 times as large as that of the acrylic, the movement of the fixed end of the adrylic bar can be made negligibly small compared with the elastic movement of other parts of the acrylic bar. When the free-free bar is shorter than the fixed-free bar, the impact force has a form consisting of two rectangles with an intermediate nonforce interval. When the free-free bar is longer than the fixed-free bar, the impact force has a form of a series of three rectangles and the height of the 2nd rectangle is twice as large as the lst and 3rd. The analyses and the experiments show fairly good agreements.
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  • Magnetic Field Analysis of Watch Stepping Motors
    Fumio KANNO, Satoshi TAKESHIMA
    Article type: Article
    1988 Volume 126 Pages 13-27
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_13
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    Stepping motors for watches rotate 180℃ every step and have a single static stability point. However, until present, it has not been shown that on what conditions the single static stability point be obtained. In connection with the shapes and sizes of permanent magnets and those of stators, we have studied the conditions for obtaining the static stability point by magnetic field analysis using the finite-element method and by confirmation experiment. In this article, we will report the result of our study.
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  • Development of Circuits for Automatic Generating Watch
    Motomu HAYAKAWA, Hiroshi YABE, Masahito YOSHINO
    Article type: Article
    1988 Volume 126 Pages 28-40
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_28
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    This paper concerns a new energy system for quartz watches which eliminates the necessity of battery exchange. We have published a technical paper of this study in the journal (No. 120, March 1987) of the Horological Institute of Japan. The principle, mechanism, and theoretical analysis of a new energy system which is called "Automatic Generating System" (AGS) were described in that paper. With this system, kinetic energy such as arm movement is transferred into electric energy. This energy is stored in the secondary electric power source.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1988 Volume 126 Pages 41-47
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_41
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  • [title in Japanese]
    Article type: Index
    1988 Volume 126 Pages 55-63
    Published: September 20, 1988
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.126.0_55
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