Browse Prior Art Database

Reach Extension Control of Cartridge Picker

IP.com Disclosure Number: IPCOM000116785D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Gallo, FD: AUTHOR [+3]

Abstract

A method for reducing the length of the time-critical time-slice for controlling, in real-time, a cartridge picker within an automated library is disclosed. A portion of the gripper operation can be accomplished without real-time monitoring of the action thereby providing additional time-slices to other threads running within the automated library controller improving overall performance of the entire system while the gripper is simultaneously performing a portion of its operation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 74% of the total text.

Reach Extension Control of Cartridge Picker

      A method for reducing the length of the time-critical
time-slice for controlling, in real-time, a cartridge picker within
an automated library is disclosed.  A portion of the gripper
operation can be accomplished without real-time monitoring of the
action thereby providing additional time-slices to other threads
running within the automated library controller improving overall
performance of the entire system while the gripper is simultaneously
performing a portion of its operation.

      A tachometer is provided on the gripper motor providing a
binary counter that is used to determine the position of the gripper
during an extend operation.  The tachometer must be monitored in
real-time in order to guarantee that all tachometer pulses are sensed
resulting in knowing the position of the gripper.  A second sensor is
provided which changes state whenever the reach operation has
travelled a fixed distance.  Just prior to having exceeded this fixed
point, real-time operations must commence to begin monitoring the
tachometer in order to turn off the gripper's reach motor at the
required distance traveled.  All distance traveled prior to the fixed
point is not monitored.

      The Figure demonstrates, at the time the motor is turned on,
the gripper plate moves from position A to position B on an extend
operation.  After turning the motor on, the processor is available to
perform other non-gripper related tasks a...