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SPRING LINKAGE MATCHING SOLENOID FORCE CHARACTERISTICS TO LOAD REQUIREMENTS

IP.com Disclosure Number: IPCOM000024905D
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 98K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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XEROX DISCLOSURE JOURNAL

SPRING LINKAGE MATCHING SOLENOID FORCE CHARACTERISTICS TO LOAD REQUIREMENTS
Raymond E. Poehlein
Maximilian C. Hogenes

\ 1

Proposed Classification
U.S. C1. 271/11 Int. CI. B65h 5/08

FIG. I

6

FIG. 2

Volume 7 Number 5 September/October 1982 305

[This page contains 1 picture or other non-text object]

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SPRING LINKAGE MATCHING SOLENOID FORCE CHARACTERISTICS TO LOAD
REQUIREMENTS (Cont'd)

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.

Figures 1 and 2 illustrate two different spring couplings (2 and 4, respectively) connecting between the solenoid plunger 1 and the valve 3 to compensate for this difference between solenoid input force and load requirement. This allows a smaller, lower power, and/or less expensive solenoid to be used, and reduces a faster opening valve. The limited spring compression travel allows the solenoid plunger 1 to begin its travel initially (before the valve 3 is opened at all) with low resistance and then to apply both a hi...