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Temporary Power Impulse to Realign Library Picker

IP.com Disclosure Number: IPCOM000123641D
Original Publication Date: 1999-Feb-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 1 page(s) / 77K

Publishing Venue

IBM

Related People

Bingham, RL: AUTHOR [+5]

Abstract

Removable media optical disks are typically dual-sided while optical disk drives typically can only read one side at a time. This necessitates flipping the optical media to the desired side, either the A or B side, before inserting it into the optical drive. Such flipping can be either done manually, for a standalone drive, or robotically, by a picker servicing an optical library. Some designs for the flipping of the optical disk by a robotic picker include a fixed datum, or stop, for aligning the picker at the completion of its flip to the operating plane of the optical drive and disk storage slots in the library.

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Temporary Power Impulse to Realign Library Picker

   Removable media optical disks are typically dual-sided
while optical disk drives typically can only read one side at a time.
This necessitates flipping the optical media to the desired side,
either the A or B side, before inserting it into the optical drive.
Such flipping can be either done manually, for a standalone drive, or
robotically, by a picker servicing an optical library.  Some designs
for the flipping of the optical disk by a robotic picker include a
fixed datum, or stop, for aligning the picker at the completion of
its flip to the operating plane of the optical drive and disk storage
slots in the library.

   During the usage of the picker, the picker can drift away
from this fixed datum and loose its orientation with respect to the
drive or cartridge storage slots.  When this happens, the picker will
then try to (a) retract disks from or (b) insert disks into the
drives or storage slots while (c) at an angle to those drives or
storage slots.  This out-of-plane angulation can result in a jamming
of the picker, at which point, I/O operations at the library level
cease and a service person may need to reset the library.

   Our preferred solution is (1) send a voltage impulse
to the flip motor of the picker before each insert or retract
operation, to reregister the picker against the desired fixed datum.
This reregistration would also be done whenever the library
encountered a picker problem, as a first means of self-repair.  (2)
If a picker problem was encountered which was not solved by this
attempt to reregister the picker against its fixed datum, we would
then try an impulse of higher voltage, longer duration, or both.  (3)
If the picker problem was still not repaired, we would advocate
repetitively flipping the optical di...