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QUADRUPLE SIX-SLOT GENEVA WHEEL MECHANISM

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Pin wheel 1 rotates about fixed axis A and carries pin a which consecutively engages straight radial slots d of four identical and symmetrically located Geneva wheels 2, 3, 4 and 5. Geneva wheels 2, 3, 4 and 5 rotate about fixed axes B, C, E and D, and their slots d are located symmetrically at angles of 60° between the axes of adjacent slots. Pin wheel 1 has concentric locking surface b which engages concave locking surfaces e of the corresponding Geneva wheels to prevent their unintentional rotation during their idle periods. When pin wheel 1 rotates continuously at uniform velocity, each Geneva wheel rotates intermittently at nonuniform velocity with six rotation periods tᵣ and six idle periods tᵢ. The time of one revolution of pin wheel 1 for each Geneva wheel is T=tᵣ+tᵢ. The angles of rotation of pin wheel 1 corresponding to an idle and to a rotation period of each Geneva wneel are ϕᵢ= 240° and ϕᵣ= 120°. The angle of rotation of each Geneva wheel to each revolution of pin wheel 1 is ϕ_G=60°. The rotation and idle factors for each Geneva wheel are p=tᵣ/T=0.3333 and q=tᵢ/T=0.6667. The working time coefficient for each Geneva wheel is k=p/q=0.5. Geneva wheels 2, 3, 4 and 5 rotate in the direction opposite to that of pin wheel 1. During the rotation period of each Geneva wheel, the other three Geneva wheels have idle periods.
$2638$PG,GW$

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Documents: Gear mechanisms  [Streambook]
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