Characteristics of the Variable Lead Screw Mechanism with 3゜ Conic Frustum Meshing Elements
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概要
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This paper outlines the theoretical and experimental analyses of the kinematic and kinetostatic characteristics of a variable lead screw mechanism(VLSM)used in high-speed shuttleless weaving looms. The mechanism consists of a slider-crank submechanism equipped with four conic frustum meshing elements with a 3゜ conical alngle to drive the variable lead screw in an oscillating manner. The screw and meshing elements act as a spatial cam pair. The conjugate surface theory and coordinate transformation are applied to develop the theoretical models used to analyze the mechanism. The kinematic curve is synthesized using optimization techniques that minimize the dissipated power due to the friction between the screw and meshing elements. The power equation is applied to analyze the input power of the VLSM, and the generalized Lanchester balancer technique is used in the design of the counterweight to reduce the shaking force. Experimental instruments are used for measuring the characteristics of the mechanism, including the angular velocity of the crank, the motion(including angular displacement, velocity and acceleration)of the screw, the input power, and the shaking forces before and after adding the counter-weight. Using a specified constant speed or the measured state of motion of the crank, the VLSM is analyzed theoretically, and results are compared with the measured results. It is shown that the input power of the prototype proposed is about one-quarter less than that of a commercial product, and the shaking force of the mechanism can be reduced by 46% once the proposed counterweight is added.
- 一般社団法人日本機械学会の論文
- 1997-09-15
著者
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Chen Fei-ya
Department Of Mechanical Engineering National Cheng Kung University
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CHIOU Shen-Tarng
Department of Mechanical Engineering, National Cheng Kung University
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Chiou Shen-tarng
Department Of Mechanical Engineering National Cheng Kung University