Apparatus and method for sensing and holding an item

Details Apparatus and method for sensing and holding an item Apparatus and method for sensing and holding an item

1994-06-20

1995-11-28

Sniezek, Andrew L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

360 92, 414273, 414280, 901 40, 901 46, G11B 1568

Patent

active

054714451

ABSTRACT:
An automated storage and retrieval system includes an accessor device to magnetically hold a stored item while the item is transported within the system. To sense the presence of a magnetically attractable label on the item, the device generates a pulsed signal having a first strength. The reluctance of the magnetic field is compared with a base value; if the comparison indicates that a label is present, the device generates another pulsed signal having a greater strength to "lock" the item against the accessor. The device then generates another pulsed signal having a reduced strength to maintain and hold the item against the accessor during transportation. Less power is used and, therefore, less heat generated.

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