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Eighteen-Wire Serial Matrix Print Head

IP.com Disclosure Number: IPCOM000035343D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Hanna, DW: AUTHOR

Abstract

Disclosed is a design for an 18-wire dot matrix print head that uses all of the critical parts from an existing nine-wire design. The design also provides for the use of print wires of two different densities to compensate for a difference in wire length. In this way, the ballistic mass of the wires remains constant, and variations in wire dynamics are negated.

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Eighteen-Wire Serial Matrix Print Head

Disclosed is a design for an 18-wire dot matrix print head that uses all of the critical parts from an existing nine-wire design. The design also provides for the use of print wires of two different densities to compensate for a difference in wire length. In this way, the ballistic mass of the wires remains constant, and variations in wire dynamics are negated.

The 18-wire print head design is illustrated in the cross-sectional view of the figure. It consists of two banks of nine electromagnetic actuators that drive the print wires 1 through appropriate guides. The stator frames 2, armatures 3, focus plates 4, and coils 5 are identical to each other and to those of the present nine- wire design. This commonality of parts avoids the development and tooling cost and the risk that an all-new development would entail.

The use of two identical actuator banks is made possible by the use of curved wires and by offsetting the banks relative to each other by 20 degrees, or half the angular distance between actuators. These two means allow the print wires from the second bank of actuators to be routed around the actuator levers of the first bank.

The use of curved wires also has the advantage that they may be perpendicular to the paper where they pass through the nose wire guide 6. This ensures that dot placement is insensitive to variations in platen gap.

In order to have the same dynamic response from actuator to actuator it is important that all of the wires have the...