Journal of the Horological Institute of Japan
Online ISSN : 2432-1915
Print ISSN : 0029-0416
ISSN-L : 0029-0416
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Volume 111
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1984 Volume 111 Pages Cover1-
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_Cover1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1984 Volume 111 Pages Cover2-
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_Cover2
    JOURNAL FREE ACCESS
    Download PDF (120K)
  • Engineering Plastic Applied Analog Quartz Watch
    Tomio OTA, Yoshikazu TANIGUCHI
    Article type: Article
    1984 Volume 111 Pages 1-10
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_1
    JOURNAL FREE ACCESS
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    Using plastic instead of metal for the material of parts is effective to improve the productivity of watch movements. Thus, we tried to use the engineering plastic for watch parts as many as possible, and developed an analog quartz watch using the plastic for the main plate, the train wheel bridge, the circuit holder, the rotor, wheel No.5, and the minute wheel. This is marketed as Cal. Y12. The Y12 offers a better assembly yield and is superior to the former calibers in such qualities as durability and shock-resistance.
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  • Dependence of Motor Characteristics on Efficiency of P-M Stepping Motor for Timepiece
    Masao KASUGA, Tomio KOTAKI
    Article type: Article
    1984 Volume 111 Pages 11-28
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_11
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    The efficiency n of PM-stepping Motor is defined in this paper as n = πΩ/Wmin, where Wmin is the minimum input energy reguired for the ordinary step motion, π the rotor mean pass of the 2-pole PM-stepping motor driven by Wmin, and Ω the frictional load acting on the motor. The efficiency is calculated through the simulation in which the expressions corresponding to the differential equations (1)and (2) in the paper are used. Many sample motors are examined for the identity test between the motions obtained by the simulation and those by the stepping motors in practice. The results obtained are as follows : 1) When the torque ratio z is introduced as the ratio of frictional load to index torque amplitude, the optimum value of z is nearly equal to 3 from the points of view of the efficiency and the reliability of stepping motor. 2) The optimum setting angle of the rotor by the index torque is approximately 45 degrees from the same point of view as above. 3) The method of calculation to obtain the optimum frictional load of stepping motor is introduced.
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  • On the Method of Accuracy Indication for Quartz Watches and Clocks
    Toshiyuki TAKIZAWA
    Article type: Article
    1984 Volume 111 Pages 29-55
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_29
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    The works for drawing up standard on the accuracy indication for quartz watches and clocks are going on in Sub-Committee (SC11) of ISO/TC 114 (Horology). The purposes are to unify the method of the accuracy indication and the related test methods for the accuracy of quartz watches and clocks internationally and to prevent unreasonally overrated indications. Proposals for the establishment of this standard have been submitted to the SC11 from Japan (N10 for watches, N11 for clocks), from Germany (N12 for watclhes, N13 for clocks), and from Switzerland (N24 for watches ). The present paper gives the results of an experiment conducted at the JHII for examining and comparing these proposals in practice.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1984 Volume 111 Pages 56-67
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_56
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1984 Volume 111 Pages 68-82
    Published: December 20, 1984
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.111.0_68
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