Browse Prior Art Database

Incremental Linear Drive Mechanism

IP.com Disclosure Number: IPCOM000083590D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Foytlin, LF: AUTHOR

Abstract

The figure illustrates a precision linear incremental drive apparatus suited for driving a movable carriage or platform, on which are carried test devices for testing key-actuator mechanisms or other devices arranged in a row at precise incremental spacings, such as on a keyboard. The device is utilized to provide a stepwise motion of the carriage carrying the test mechanism and to also provide an appropriate dwell during which testing of the key actuators takes place, followed by another incremental movement to the next key position, etc.

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Incremental Linear Drive Mechanism

The figure illustrates a precision linear incremental drive apparatus suited for driving a movable carriage or platform, on which are carried test devices for testing key-actuator mechanisms or other devices arranged in a row at precise incremental spacings, such as on a keyboard. The device is utilized to provide a stepwise motion of the carriage carrying the test mechanism and to also provide an appropriate dwell during which testing of the key actuators takes place, followed by another incremental movement to the next key position, etc.

In the figure, a fixed, toothed rack 1 is anchored to the bed of the test bench or stand. Rack 1 is provided with a plurality of teeth 2 arranged at a precisely fixed pitch P. The carriage or mounting platform for the test instruments is not shown, but the carriage is equipped with a continuously rotating drive motor having an output shaft attached to disk 3.

Disk 3 has attached to it a freely pivoted arm or pawl 4 pivoted by a bearing pivot 5. A fixed pin 6 adjacent the perimeter of the disk 3 serves to keep pawl 4 from riding beyond the vertical center line of disk 3. Pin 6 is affixed to the carriage, not shown.

As is illustrated in various stages of progression, disk 3 rotates in a clockwise direction and lowers the pivot point 5 and pawl 4 until the end of pawl 4 engages a tooth 2 on rack 1. At this point, as disk 3 continues to rotate, a resultant force in the horizontal direction is prod...