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Energizing Circuit for an Air Socket

IP.com Disclosure Number: IPCOM000045879D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 34K

Publishing Venue

IBM

Related People

Baker, DE: AUTHOR [+3]

Abstract

In conventional module-handling equipment for automated testing, an air socket is employed to selectively clamp the module pins of the module under test into an electrical socket so as to enable the test to take place. Pneumatically actuated air sockets are susceptible to malfunctions of various types, causing significant down time for the module-handling equipment.

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Energizing Circuit for an Air Socket

In conventional module-handling equipment for automated testing, an air socket is employed to selectively clamp the module pins of the module under test into an electrical socket so as to enable the test to take place. Pneumatically actuated air sockets are susceptible to malfunctions of various types, causing significant down time for the module-handling equipment.

A circuit is displayed to electrically energize an air socket to improve the reliability of the socket's operation. The circuit features an automatic reset of the air socket into its open or module accepting state, when the power is turned on or when a timing shaft for the handler passes through zero degrees orientation. This results in an affirmative reset of the socket's operation, thereby precluding malfunctions due to poor synchronization between the socket and the module- advancing equipment.

The figure illustrates the invention. A timing shaft 1 rotates through an angle B at a constant angular velocity, and specific module-handling functions are triggered based upon the value of the angle B. In particular, when the timing shaft passes through zero degrees orientation, the air socket is reset to its open position and is available to accept the plugging in of a module. When the timing shaft rotates to its 27 degrees orientation, the air socket is clamped into its closed state, thereby mechanically clamping the pins of a module so as to make electrical contact and enable testing to be performed. When the timing shaft passes through its 47 degrees position, the air socket is once again opened, thereby releasing the pins of the module. encoding the angular orientation of the timing shaft 1 into a serial code. The output of the shaft encoder 2 is input to the serial/ parallel thumb wheel selector 13, which converts the serial shaft code into a parallel number having a units digit (U), a tens digit (T) and a hundreds digit
(H). The units digits, tens digits, and hundreds digits are selected by means of mechanical thumb wheels in the selector 13 so that three respective outputs are available. For example, U1, T1 and H1 are input to the AND gate 3 as the value of 27 degrees, U2, T2 and H2 are input to the AND gate 4 for the value of 47 degrees, and U3, T3 and H3 are input to the AND gate 8 as the value of zero degrees. Thus, the AND gate 3 is satisfied when the timing shaft has Theta equal to 27 degrees, the AND gate 4 is satisfied when the timing shaft has Theta equal to 47 degre...