SPRING LINKAGE MATCHING SOLENOID FORCE CHARACTERISTICS TO LOAD REQUIREMENTS
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Conventional electrical solenoids typically have a non-uniform output force varying with the solenoid plunger stroke position. They typically provide a minimum force initially at the start of the solenoid plunger travel, and an increasing force as the solenoid plunger is increasingly retracted. This is opposite to many load require-ments, for example, air valves in the pneumatic sheet separator system of a copier document feeder, which have a maximum load requirement (maximum force resistance) initially, e.g., in opening a closed valve.