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RESEARCH PAPERS

A Novel Continuous Alternate Motion Mechanism With Two Input Wheels

[+] Author and Article Information
Giuseppe Quaglia

Department of Mechanics, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italygiuseppe.quaglia@polito.it

Daniela Maffiodo

Department of Mechanics, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italydaniela.maffiodo@polito.it

Francesco Pescarmona

Department of Mechanics, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italyfrancesco.pescarmona@polito.it

J. Mech. Des 129(8), 858-864 (Jun 27, 2006) (7 pages) doi:10.1115/1.2735638 History: Received February 23, 2006; Revised June 27, 2006

This paper presents the design of a mechanism with the following specifications: continuous alternate motion, wide motion phases with constant angular velocity, parallel input and output shafts, and great strokes. Those specifications derive from a possible application in the textile field. The mechanism is composed of two star wheels properly coupled together: there are two counter-rotating input wheels, alternately coupling with slots first, then teeth at each side of the output wheel. As usual for star wheels, pins and slots handle the acceleration and deceleration phases, while the constant velocity phase is performed by coupling sectors of toothed gears. A proper design of pins and slots is performed, so that at the same time when a pin from one input wheel is releasing a slot, a pin from the other input wheel engages a slot on the other side of the output wheel, forcing the latter to an opposite motion. In this way the output wheel has a continuous and smooth alternate motion. By annihilating the arrest phases typical of star wheels, the proposed system eliminates the discontinuities in the acceleration diagram. The paper develops a complete parametrical analysis of the device, underlining the effect of the constraints on the shape of the motion laws with particular emphasis on the acceleration and deceleration phases. In this way the output wheel has a continuous and smooth alternate motion. With respect to an analogous mechanism realizing the same laws of motion, e.g., cams, this device is very compact and economical, also presenting parallel input and output shafts, and significantly reduces sliding and wear.

FIGURES IN THIS ARTICLE
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Copyright © 2007 by American Society of Mechanical Engineers
Topics: Motion , Wheels , Mechanisms , Design
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References

Figures

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Figure 1

Desired law of motion of the double star wheel mechanism

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Figure 2

Scheme and notations of the proposed mechanism

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Figure 3

Movement sequence of the mechanism

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Figure 4

Scheme of the mechanism and notations

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Figure 6

β′=dβ(α)∕dα

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Figure 7

β″=d2β(α)∕dα2

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Figure 9

Y′=dY(τ)∕dτ

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Figure 10

Y″=d2Y(τ)∕dτ2

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