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Drop Time Qualification for Solenoids

IP.com Disclosure Number: IPCOM000046444D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Compton, JI: AUTHOR [+3]

Abstract

For a solenoid to function properly in an environment such as a typewriter, it is necessary to be picked and, upon release, be returned to its unpicked position in time for the next cycle. In the event that the solenoid has not returned to its unpicked position in time for the next machine cycle, a malfunction will occur. Empirical times may be established by analyzing known good solenoids of the type being tested and a time for picking and restoring of the solenoids may be established. Should the time period exceed the empirically determined pick time, then the solenoid is not functioning in its appropriate manner and may be detected as a bad or malfunctioning solenoid.

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Drop Time Qualification for Solenoids

For a solenoid to function properly in an environment such as a typewriter, it is necessary to be picked and, upon release, be returned to its unpicked position in time for the next cycle. In the event that the solenoid has not returned to its unpicked position in time for the next machine cycle, a malfunction will occur. Empirical times may be established by analyzing known good solenoids of the type being tested and a time for picking and restoring of the solenoids may be established. Should the time period exceed the empirically determined pick time, then the solenoid is not functioning in its appropriate manner and may be detected as a bad or malfunctioning solenoid. The technique for measuring the drop time as an indication of proper function is one of cycling the solenoid repeatedly at a frequency corresponding to the minimum value for the pick time. Thus, when the solenoid is picked and released, it only has time to actually pick and then return to its unpicked position before the next pick command occurs. By monitoring the current wave form of the electromagnetic coil, anomolies may be detected indicating that the solenoid has not released and returned to its unpicked condition and would thereby indicate that the solenoid is either jammed or is causing to hang due to mechanical binds or residual magnetism within the solenoid plunger.

If any of these conditions exist and the solenoid does not respond within the prescri...