US 4,400,102 AGranted

Multi-color print head

AssigneeCentronics Data Computer Corp.

InventorsJohn Shiurila, Richard A. Williams

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Abstract

A dot matrix impact printer for printing a plurality of colors substantially simultaneously. A print head is comprised of three spaced substantially parallel columns of print wires, each column containing an equal number of print wires. Separate independent ink supply sources are provided immediately adjacent the print head, and ink delivery means carry the ink from an associated supply source to the printing tips of the print wires in an associated column. Each of the ink supply containers contain an ink of a different color. The colors may, for example, be the three primary colors. The ink delivery means incorporate capillary means for delivering ink from the ink supply container to the printing tips by capillary action. Printing dots of different colors in either a partially or a substantially overlapping fashion enables any color to be created from the three primary colors. The ink delivery means may deliver ink to the print wires at a location inwardly from the printing tips or may deliver the ink directly to the printing tips. The technique of ink delivery may also be utilized in shuttle printers of the dot matrix type.

Claims3

Dependent claims

Apparatus for color printing comprising:

at least first and second reciprocating print elements;
first and second ink supply containers each containing ink of different colors;
first and second elongated capillary means, each having a first end extending into said ink supply container and a second end positioned to engage an associated one of said printing members, whereby ink is delivered to the printing face of the first and second printing elements by their associated capillary members to effect printing by transfer of ink from the printing face to a print receiving medium when the printing faces impact the print receiving medium, said printing elements being capable of being operated simultaneously;
each said capillary means comprising:
a first capillary member, having a tapered upper edge, provided in its associated ink container, and
a second capillary member engaging at least a portion of said first capillary member and positioned to wipingly engage its associated printing member;
means for normally biasing all of said containers in a first direction;
handle operated means for simultaneously urging all of said containers in a second direction opposite said first direction, to control the size of the area of engagement between said engaging capillary members.

5 more elements

Dependencies are inferred from the claim text.