Browse Prior Art Database

Mechanical Indexing and Detenting Mechanism

IP.com Disclosure Number: IPCOM000086237D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Frederick, JJ: AUTHOR [+3]

Abstract

This mechanism 1, Fig. 1, when coupled to a high-speed motor 2, provides both high-speed rotation and accurate (+ or - 30 sec) low-velocity indexing of a high-inertia load 12, such as a rotating disc. The mechanism provides a positive position detent through application of a force multiplying linkage, which is theoretically capable of applying an infinite force. Inertial loading on the parts 13 indexed is minimized by proper selection of linkage ratios which control indexing acceleration/deceleration.

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Mechanical Indexing and Detenting Mechanism

This mechanism 1, Fig. 1, when coupled to a high-speed motor 2, provides both high-speed rotation and accurate (+ or - 30 sec) low-velocity indexing of a high-inertia load 12, such as a rotating disc. The mechanism provides a positive position detent through application of a force multiplying linkage, which is theoretically capable of applying an infinite force. Inertial loading on the parts 13 indexed is minimized by proper selection of linkage ratios which control indexing acceleration/deceleration.

Indexing and detenting are accomplished as follows with respect to Fig. 2 which is a detail drawing of the mechanism 1. Double-acting air cylinder 5 moves the clevis 6 back and forth between points X and Y. Connecting links 7 cause pivot arms 8 to swing through arc Phi. In position X, rollers 9 are located in grooves of starwheel 3 which is rigidly connected to the motor shaft 11 and inertial load providing the locking function.

When rotating action of upper pivot arm 8 begins, pawl 10 engages one of the pins 4 on starwheel 3 causing the starwheel (and motor shaft) to rotate through one notch providing indexing.

With clevis 6 held at position Y, pivot arms 8 are held at the open position. Rollers 9 are out of starwheel notches. Shaft 11 is free to rotate at higher speeds.

Pneumatic circuitry provides alternate action of the cylinder 5 creating a stepping indexed and detented motion to the disc.

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