Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1997 Volume 160 Pages Cover1-
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_Cover1

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[title in Japanese]

Article type: Cover
1997 Volume 160 Pages Cover2-
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_Cover2

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Stick-Slip Motion of Micromechanisms

Tetsuya SUZUKI, Tatsuya KIMURA, Kiyoshi ITAO

Article type: Article
1997 Volume 160 Pages 1-10
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_1

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This paper studies on the stick-slip motion of micromechanisms which is one of the most important issues in their microdynamics design since it deteriorates the motion control accuracy of micromechanism applications such as optical fiber alignment and magnetic head positioning. First, stick-slip motion of micromechanisms is observed clearly in micro wire insertion motion and brush actuator driving mechanism motion. Next, on the basis of our another reserch of cantilever dynamics, approximate formula that predicts critical condition for the stick-slip of a cantilever is derived in the cantilever of small damping.ζ<<1. The experimental apparatus is consisted of a cantilever, a laser displacement sensor and an extremely slow turn table with a linear velocity between 0.005 and 0.5 mm/s. The experimental results of vibration frequency and critical velocity agreed well with theoretical results. Moreover, the relationship between the cantilever size and the critical velocity is studied based on our theory. It is predicted that there exits a cantilever size which minimizes stick-slip appearance region.

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Development of a Digital Watch with an Evaluation System of Punching in Fighting Techniques

Haruo ONO, Masakatsu YAMAGISHI

Article type: Article
1997 Volume 160 Pages 11-18
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_11

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The intensity of punching can be quantified by the peak value of impact force and impulse. The peak value of impact force is depended on mass, velocity and shock absorbing characteristic of two objects. This study aimed to develop a new amusement watch which evaluates the intensity of punching by measuring the acceleration of wrist position and presumes the velocity of punching.

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Magnetic Field Analysis of Stepping Motor

Hiroyuki KOJIMA, Hirokazu SEKINO

Article type: Article
1997 Volume 160 Pages 19-27
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_19

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Recently, the development schedule for new products has been reduced, and it has become necessary to determine design parameters by analysis techniques as much as possible without performing experiments. Until now, especially in the case of motors, evaluation by experiment was more principal than that by analysis, and experiments were repeated until the required functions of a motor were obtained. However, by making a magnetic field analysis of a motor, the magnetic characteristics can be directly understood, and reduction of time needed for development can be expected, because design and development using highly accurate parameters will be possible.Accordingly, two and three dimensional magneto-static analyses were made, because their validity was confirmed as a result of examining the applied methods including cogging torque analysis, analysis of static equilibrium placement and magnetic flux leakage analysis.

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Development of a Precision Oil Jet Supplier for Lubricant

Tomosi KANEKO, Takayuki UCHIDA, Kouichi NAKAYAMA

Article type: Article
1997 Volume 160 Pages 28-37
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_28

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For watch manufacturing, lubricants supply is one of the foremost requirements to obtain the quality. But lubricants supply for watch movements has some problems, because the parts size for watches is very small, and the accuracy and the stability of lubricant volumes are required. We developed a precision oil supplier which can eject lubricants by piezoelectric material. It can supply the lubricants without the contact of nozzle and movements by ejecting drops. The minimum quantity of the lubricant we have achieved is 0.001(mm^3). Lubricant with viscosity approximately 100 times higher than that of the ink for inkjet printers can be ejected by the noncontact precision ejecting. The development of the oil jet precision injector for watch lubricants is described in this paper.

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Development of SEIKO PULSE GRAFH(Part of the Sensor)

Yutaka KONDO, Katsuyuki HONDA, Keisuke TSUBATA

Article type: Article
1997 Volume 160 Pages 38-48
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_38

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We developed the SEIKO PULSE GRAPH which is a pulse rate training tool for runners. In pulse rate training, the strength controlled by the pulse rate instead of the speed. The PULSE GRAPH helps the training by measuring pulse rate all the time. Organization of PULSE GRAPH and the new technology for measuring pulse rate are explained as follows: The blue sensor catches pulse waves in a high S/N ratio. Although pulse waves have motional noise caused by running, a twin FFT system separates the pulse signal from the motional noise. In the present paper the sensor part is described mainly.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

Article type: Article
1997 Volume 160 Pages 49-66
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_49

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[title in Japanese]

Article type: Index
1997 Volume 160 Pages 68-73
Published: March 20, 1997
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.160.0_68

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