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Research Papers

The Automatic Winding Device of a Mechanical Watch Movement and Its Application in Energy Harvesting

[+] Author and Article Information
Longhan Xie, Ho Ching, Ruxu Du

Institute of Precision Engineering, Chinese University of Hong Kong, Shatin, N. T., Hong Kong SAR

Carmen G. Menet

Schneeberger AG, Lineartechnik, St. Urbanstrasse 12, CH-4914 Roggwil, Switzerland

J. Mech. Des 131(7), 071005 (Jun 23, 2009) (7 pages) doi:10.1115/1.3151803 History: Received October 29, 2008; Revised May 06, 2009; Published June 23, 2009

Invented more than 200 years ago, the automatic winding device of mechanical watch movement is one of the most successful energy harvesting devices. It harvests the kinematical energy from body movements and drives the mechanical watch movement. According to literatures, however, few have studied its kinematics in detail. In this paper, the kinematical model of automatic winding device is developed. The model is a pendulum model with a set of gears that converts the bidirectional motion to unidirectional motion. The simulation shows that the efficiency of the device is about 46.3%. Experiment validations are also conducted, which confirm the simulation results. With some modifications, it can be used to drive various mobile electronic devices.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

The working of an automatic winding device (19)

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Figure 2

The CAD model of the automatic winding device, front view

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Figure 3

The CAD model of the automatic winding device, back view

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Figure 4

Illustration of the reversing mechanism

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Figure 5

Schematic of winding system when arm is swinging

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Figure 6

The force diagram of the system

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Figure 7

The gear train of the automatic winding device

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Figure 8

Reaction force of the mainspring as a function of the winding angle

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Figure 9

The angular displacement of the upper pendulum and the lower pendulum

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Figure 10

The angular velocity of the upper pendulum and the lower pendulum

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Figure 11

The angular acceleration of the upper pendulum and the lower pendulum

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Figure 12

The winding curves with different arm swing amplitudes; the period is 5.19 s

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Figure 13

The winding curves with different arm swing periods; the amplitude is 27 deg

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Figure 14

Total input energy in terms of time

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Figure 15

The system efficiency as a function of the swinging period (under a constant swinging amplitude)

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Figure 16

The setup for experimental testing

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Figure 17

Schematics of the proposed energy harvester

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