Double speed dot matrix printhead
AssigneeXerox Corporation
InventorJoseph Po-Wah Ku
Life of this patent
Estimating the term…
Abstract
A dot matrix printer including a single printhead having two columns of print wires, the wires in one column being used to print only odd numbered dot columns on a record member and the wires in the other column being used to print only even numbered dot columns on the record member. In one embodiment the wire columns are spaced apart a distance equal to an even number multiple of the space between two adjacent dot columns and the wires in each column are then energized alterntely as the printhead traverses the dot column positions. In another embodiment the wire columns are spaced apart an odd number multiple of the space between two adjacent dot columns and the wires in each column are then energized simultaneously as the printhead traverses the record member.
Claims7
A single, movable printhead for use in a high speed printer for printing a dot matrix of characters on a record member, the matrix including odd- and even-numbered columns of dots, a dot column being a series of dots aligned so that a straight line extending through the centerpoints of the dots is at a fixed angle to the direction of movement of the printhead, comprising:
- a. a first column of a predetermined number of means for printing only odd-numbered dot columns on the record member;
- and
- b. a second column of a predetermined number of means for printing only even-numbered dot columns of the record member, said second column being spaced from said first column by a predetermined distance equal to an odd multiple of the space between two adjacent dot columns, center-to-center.
Dependencies are inferred from the claim text.