Browse Prior Art Database

Tray Presence Sensor for Loading and Unloading Apparatus

IP.com Disclosure Number: IPCOM000075145D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Livesey, AG: AUTHOR

Abstract

In testing semiconductor modules, the modules are unloaded from the channels of trays, conveyed to a tester and dependent on the results of the tests, sorted into categories for loading into the channels of other trays. Sensors are provided at the home unload and load positions in the unloading and loading apparatus to determine the presence of a tray in those positions.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

Tray Presence Sensor for Loading and Unloading Apparatus

In testing semiconductor modules, the modules are unloaded from the channels of trays, conveyed to a tester and dependent on the results of the tests, sorted into categories for loading into the channels of other trays. Sensors are provided at the home unload and load positions in the unloading and loading apparatus to determine the presence of a tray in those positions.

Views A and B show the unloader and loader, respectively, to be bilevel apparatus. In the unloader, trays 1, 2, 3 move in the direction of arrow 4 at a lower level 6 to be unloaded from the channels of the tray in a downward direction as indicated at 5. When fully unloaded, the tray is lifted upwardly to the upper level 7 such as the trays 8, 9, 10.

Similarly, in the loading apparatus, trays 11, 12, 13 move in the direction of arrow 14 along the upper level of the apparatus 16 to be loaded in the direction indicated at 15. When fully loaded, trays are dropped to the lower level 17 as indicated by the trays 18, 19, 20.

In both the unloading and loading apparatus, sensing devices 21, 22 are provided to detect when the trays are in the home positions, that is, the positions occupied by the trays 3 and 13. When in these positions, the unloading and loading of trays 3 and 13 occurs, respectively. Sensors 21, 22 make direct contact with trays 3 and 13 only when the trays are in the fully home position. The sensors operate within a closed-loop pne...