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Biasing of a Solenoid Armature Through Control of Coil Current

IP.com Disclosure Number: IPCOM000061396D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Vitek, EJ: AUTHOR

Abstract

A tip of a solenoid armature is positioned against a solenoid adjustment screw on a print hammer body by a relatively small coil current prior to normal operating current being supplied to the coil to activate the print hammer body for printing so that a spring is not required to hold the tip of the solenoid armature against the solenoid adjustment screw on the print hammer body.

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Biasing of a Solenoid Armature Through Control of Coil Current

A tip of a solenoid armature is positioned against a solenoid adjustment screw on a print hammer body by a relatively small coil current prior to normal operating current being supplied to the coil to activate the print hammer body for printing so that a spring is not required to hold the tip of the solenoid armature against the solenoid adjustment screw on the print hammer body.

When a solenoid armature is to be activated to cause print- ing of a character by the armature moving a hammer print body, a relatively small staging current such as 0.25 amp is applied to a coil of the solenoid for a relatively short period of time such as 25 milliseconds as indicated at 1. This is prior to a normal operating current, indicated at 2, being applied to the coil to cause motion of the solenoid armature to move the print hammer body to its print position.

After the operating current is discontinued, smaller cur- rents, indicated at 3 and 4, may be applied for relatively short periods of time. These simulate characteristics of a spring when the solenoid armature is returning to its home position.

The application of the staging current at 1, prior to the normal operating current at 2, insures that the tip of the armature is against the print hammer body when the normal op- erating current is applied to the coil. However, the staging current at 1 is not sufficient to cause motion of the print hammer body.

The use o...