Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1967 Volume 43 Pages Cover1-
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_Cover1

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[title in Japanese]

Article type: Cover
1967 Volume 43 Pages Cover2-
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_Cover2

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 1-5
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_1

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An Analysis of the Magnetic Escapement : (II) Stability at synchronous speed

Akira Nikaido

Article type: Article
1967 Volume 43 Pages 6-34
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_6

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We have explained in our last paper (1) that the design parameters in the magnetic escapement could be evaluated. In this paper, another method in which adjustment cofficient, we term, obtained from the measurement of the static torque of the magnetic escapement can be used for analysis is described. and we oftained the following reaults: (1) We got the general static torque T of the magnetic escapement in the following form: T=-Σ^^n__<k=1>ok(γ).sin kzθo k(γ)=Ak_0+Ak_1 (γ-γ_0)+Ak_2(γ-γ_0)^2+・・・+Akn(γ-γ_0)^n Where. A^kj, γ, γ, ,z and θ are adjustment ooefficient, distance from the center of the magnetic wheel to that of the driving magnet, distance from the center of the magnetic wheel to that of medium path, numbers of the teeth and the rotating angle of the magnetic wheel in space. (2) The instantanous and mean torque at synchronous speed in idealized state are given in the simple expressions. (3) The problem of multiple. synchronous speeds and their modes are revealed. (4) It is diclosed that the problem of stability of the magnetic escapement at synchronous speed mathmatically leads to that of stability of solutions in variadle parameter systems. (5) Fluctuation of the load angle is simulated by analog computer and compared with the result oftained by high speed film.

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On the characteristics of a new mechanical resonator.

Hiromi Ueda, Hiromi Yosihda, Tsutomu Iesaka, Tsutomu Kojima

Article type: Article
1967 Volume 43 Pages 35-41
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_35

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A new mechanical resonator for time base has been developed. The resonator(50mm in length, 14mm in width and 0.6mm in thickness) is electrodynami cally drived at its resonant frequency(l00c.p.s). Obtai ned results are as follows:(1) The Q factor of the resonator changes with its amplitude, and depends whether in air or in vacuum. The highest value of the Q factor obtained experiment-ally is 6200. (2) initial aging is less than 3×10^-5 oer 24 days (3) The base fixing the resonator influences slightly on the resonant frequency. (4)Through the experimental reseaches, it is ascertained that this type of resomator is a highly efficient, paticularly, for the low frequency range.

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An added mass type tuning fork

Koichi Iwaki, Kohei Koizumi

Article type: Article
1967 Volume 43 Pages 42-51
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_42

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It is discussed in this report how to decrcase the vibrating stress at thc supporting point of a tuning fork which causes to leak the energy of vibration from the point. In the discussion, the relation of the added mass on each free end of the tuning fork to the stress vibration at the supporting point in the direction parallel to the tincs is considcred theoreticallyand the Possibility of the complate climination of the leakage at the supporting point is suggested. The result of the consideration is ascertained experimentally. The stress would be considered as invitable one in a tuning before, however, by the result of investgation, it is seen that such problem can be solved and higher Q tuning fork is easi1y obtaincd.

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 52-59
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_52

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 60-69
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_60

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TEST OF BATTERY-DRIVEN CLOCKS

Japan Watch & Clock Inspection Institute

Article type: Article
1967 Volume 43 Pages 70-84
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_70

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During the last decade or so, battery-driven clocks have come to be produced on a fairly large scale and have tended to be popularized chiefly for horne use. These clocks come in var ous different mechanisms, each of which has its own unique characteristics. But they can be divided largely into two groups-- the electromagnetic impulsion type and the electric self-winding type. Each of the two groups consists of the balance-wheel type, pendulum type and tuning-fork and reed-vibration type. With regard to various battery-driven clocks--boch foreign and domestic makes--available on the Japanese market today, we have conducted a short initial performance test and followed it up with a long-term test--lasting one year--for performance and, function. The data obtained from these tests Will be reported here in a summarized form.

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 85-89
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_85

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 90-
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_90

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 91-92
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_91

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 93-95
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_93

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 96-97
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_96

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[title in Japanese]

[in Japanese]

Article type: Article
1967 Volume 43 Pages 98-103
Published: September 10, 1967
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.43.0_98

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