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Low Work Wire Matrix Print Head

IP.com Disclosure Number: IPCOM000074379D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cowardin, RL: AUTHOR [+3]

Abstract

This description is directed to a multiple wire matrix printing head of unique design which utilizes a single solenoid operated hammer to reduce the total number of high-current solenoids used in prior multiple wire matrix printing heads.

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Low Work Wire Matrix Print Head

This description is directed to a multiple wire matrix printing head of unique design which utilizes a single solenoid operated hammer to reduce the total number of high-current solenoids used in prior multiple wire matrix printing heads.

Wire matrix printing heads of existing design utilize a highcurrent solenoid for each wire in the multiple wire head. According to the head design described herein, these high-current solenoids are replaced by relatively low-current set up solenoids. A single hammer with its own solenoid arranged on the opposite side of the paper supplies the printing force. The print wires are selectively set and the hammer solenoid is energized. The hammer force is sufficient to cause all print wires to overcome its magnetic force from the set up solenoids which causes the selected wires to protrude. This arrangement provides uniform dot printing regardless of the number of print wires selected. The print wire solenoid select currents are terminated early enough during the printing cycle to prevent reselection following restoration by the print hammer. Each print wire is provided with a return spring which prevents unselected wires from creeping into print position.

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