Journal of the Horological Institute of Japan

Journal of the Horological Institute of Japan

Online ISSN : 2432-1915
Print ISSN : 0029-0416
ISSN-L : 0029-0416

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Volume 54

Displaying 1-8 of 8 articles from this issue

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[title in Japanese]

Article type: Cover
1970 Volume 54 Pages Cover1-
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_Cover1

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[title in Japanese]

Article type: Cover
1970 Volume 54 Pages Cover2-
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_Cover2

JOURNAL FREE ACCESS

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Impact Test for Wrist Watches

H. ISEKI, T. KATO

Article type: Article
1970 Volume 54 Pages 1-13
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_1

JOURNAL FREE ACCESS

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The mothod of impact test and the standard for shock resistant wrist watches are under investigation in ISO/TC114 WGI. Problems which proposed through their examination are, for example, difference between impact obtained by pendulum impact test and by free-fall test, material of the sabot, proper height of hammer, etc. Now, we report herewith the results of our various tests, which has been carried out to get the data for the above examination.

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Characteristics of Tuning Fork with Dynamic Damper

Akio Ishizaka, Tomio Kotaki

Article type: Article
1970 Volume 54 Pages 14-30
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_14

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The experimental research about the characteristics of the tuning fork with a so-colled Frahm type dynamic damper a ttached to its supported point is reported. The experimental results say that the tuning fork with the dynamic damper can be modelized to a linear system of two-degree-of-freedom. Accordingly, the supported point of the tuning fork becomes a still point independent of the natural frequency f_l of the system which consists of the mass m_l of the tuning fork and of the spring constant k_1 of the support, when the natural frequency f of the tuning fork is equal to the natural frequency f_2 of the dynamic damper. The most significant. characteristics are as follows: (1) Because of no energy loss from the support, the Q-factor of the tuning fork with the dynamic damper becomes very high compared with of the tuning fork without damper. (2) The intensity of sound issued from the box, in which the tuning fork is set, is reduced extremely by the use of the dynamic damper.

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[title in Japanese]

[in Japanese]

Article type: Article
1970 Volume 54 Pages 31-47
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_31

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[title in Japanese]

[in Japanese]

Article type: Article
1970 Volume 54 Pages 48-64
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_48

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[title in Japanese]

[in Japanese]

Article type: Article
1970 Volume 54 Pages 65-71
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_65

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[title in Japanese]

Article type: Bibliography
1970 Volume 54 Pages 72-
Published: June 25, 1970
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.54.0_72

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