Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1986 Volume 118 Pages Cover1-
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_Cover1

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[title in Japanese]

Article type: Cover
1986 Volume 118 Pages Cover2-
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_Cover2

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Dynamic Measurement of watch Mechanism by Means of Laser Doppler Effect

Jia-zi SUN, Hui-He QUI

Article type: Article
1986 Volume 118 Pages 1-13
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_1

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Observation of Longitudinal Impact Forces

Genrokuro NISHIMURA, Tatsuo NARABAYASHI

Article type: Article
1986 Volume 118 Pages 14-22
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_14

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Impact forces produced by londitudinal collisions of elastic bars are observed with the aid of piezoelectric pickups. According to elementary theories for londitudinal waves, the impact force has rectangular wave form with sharp rise and descent. In order to obtain experimentally the impact force which has the same rectangular form as the theoretical One, most important is the precise alignment of the two colliding bars. Miss alignment of less than 0.003 rad is obtained with precise dpparatus and careful adjustment, and nearly rectangular forms of impact forces are observed. Two specimen bars, mounted on steel rail and ball guides, are supported horizontally.

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Shock Absorbing Characteristics of High Polimers

Takeshi IKEDA, Koichi OZAKI, Yasuo JINBO

Article type: Article
1986 Volume 118 Pages 23-39
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_23

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Shock absorbing characteristics of high polimers such as vinyl chloride, polybutylene terephthalate, cellulose acetate, and polyester elastomers are studied. A wooden hamIner strikes a steel anvil. At the top of the hammer a small steel ball is installed and this steel ball collides the steel anvil. An impact force at the colliding instant is measured with a piezoelectric pickup and impact acceleration is also measured with an accelerometer. Then a polymer sheet is placed on the steel anvil and the hammer strikes the sheet on the anvil. The impact force and impact acceleration in this case become less than the ones without polymer sheet. At the best condition the force is found to become 8 % of the one without polymer.

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Time Keeping Device Used in Diving Operation

Minoru YAMADA

Article type: Article
1986 Volume 118 Pages 40-49
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_40

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To avoid decompression sickness, a diver who conducts diving operations must control his diving time on the basis of the decompression table. In this respect, a diver's watch plays an important role. The rotary bezel, which is peculiar to the diver's watch, was born under such circumstances. Some rotary bezels carry even a table of no-decompression time limits. In an attempt to make it multifunctional, a diver's watch with a depth meter has been developed. The newly developed one is equipped with a depth meter comprising a semiconductor pressure sensor. Compared with conventional depth meters, the new model has been proved to have improved accuracy and additional useful functions. Recently, it became popular in the sport diving to measure the diving time with a water-pressurd operated stopwatch and to make measurements of surface intervals and frequency of diving. Furthermore, there is a specific time keeping device being developed and marketed for diVers, which indicate by means of a built-in computer the decompression data based on the paramdters of the diving depth and diving time. In such a manner, time keeping devices used for sports diving or diving operations are differentiating into various types such as diver's watches, water proof stopwatches operated by water pressures, and decompression data indicators.

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[title in Japanese]

[in Japanese], [in Japanese]

Article type: Article
1986 Volume 118 Pages 50-55
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_50

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[title in Japanese]

[in Japanese], [in Japanese]

Article type: Article
1986 Volume 118 Pages 56-61
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_56

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[title in Japanese]

[in Japanese]

Article type: Article
1986 Volume 118 Pages 62-64
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_62

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[title in Japanese]

[in Japanese]

Article type: Article
1986 Volume 118 Pages 65-67
Published: September 20, 1986
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.118.0_65

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