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Shaft Rotation Limit Shift Mechanism

IP.com Disclosure Number: IPCOM000077817D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Veals, ER: AUTHOR

Abstract

A mechanism is shown for limiting the extent of rotation of a driven shaft, to an angular displacement of greater than one but less than two complete revolutions.

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Shaft Rotation Limit Shift Mechanism

A mechanism is shown for limiting the extent of rotation of a driven shaft, to an angular displacement of greater than one but less than two complete revolutions.

The shaft 12 of Fig la which is driven by a reversible motor, is to have its extent of rotation limited to an angular displacement of greater than one but less than two complete revolutions. To impose such limitation, the shaft rotation limit switch mechanism shown in Figs. 1a and 1b is employed. The shaft 12 projects through the mounting plate 4, and supports the rotating drum 1. Two electric switches 2 and 3 with roller actuators, are mounted to the plate 4 along with the cam pivot 5. The cam 6, mounted on cam pivot 5, is maintained in its center position, shown in Fig. 1b, by a spring 7. The cam 6 is driven from its center position by the pin 8 mounted on the drum 1.

With the shaft 12 rotated in the clockwise direction to its furthermost extent, the cam 6 is rotated downwardly by the pin 8 in the drum 1, which rides on the top surface 9 of the cam 6. The electric switch 3 is contacted by the 6 (Fig. 2) and serves to reverse the existing direction of drive for the motor driving the shaft 12, thus effecting a limitation on the extent of rotation in the clockwise direction.

As the drum 1 rotates in a counterclockwise direction, the cam 6 returns to its center resting position and the drum 1 continues to rotate until the pin 8 strikes the bottom surface 10 of the cam 6, after the shaft has rotated through an angu...