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Operating Two Print Wires with One Magnet

IP.com Disclosure Number: IPCOM000050597D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Herman, RL: AUTHOR

Abstract

Conventionally, in wire matrix printers each print wire is operated by an individual solenoid or electromagnet associated therewith. Thus, in a printhead having eight wires, eight magnets are required. Referring to the figure, a print head actuator mechanism is shown in which a single DC electromagnet is utilized to actuate two separate print wires. Thus, using eight electromagnets, sixteen individual print wires can be constructed into a wire matrix print head.

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Operating Two Print Wires with One Magnet

Conventionally, in wire matrix printers each print wire is operated by an individual solenoid or electromagnet associated therewith. Thus, in a printhead having eight wires, eight magnets are required. Referring to the figure, a print head actuator mechanism is shown in which a single DC electromagnet is utilized to actuate two separate print wires. Thus, using eight electromagnets, sixteen individual print wires can be constructed into a wire matrix print head.

Referring to the figure, if it is desired to actuate print wire 1, then the electromagnet is energized such that the polarity of the armature is south-north (south pole on the left). On the other hand, if it is desired to actuate wire 2, the electromagnet is energized so that the polarity of the armature is north-south (north pole on the left side). The polarity direction can easily be controlled by the direction of the electrical current introduced into the coil in such a manner that the positive side of the current is at the south pole.

As shown in the figure, each of the levers has a permanent magnet directed in opposite polarity affixed thereto and in alignment with the core of the electromagnet. Whenever the electromagnet is polarized such that a north pole of the permanent magnet and the south pole of the electromagnet are together, an attraction of the two magnets occurs, causing that lever to rotate and thrust the associated print wire forward. The rebound...