Electrophotographic apparatus cartridge for high speed printing

An apparatus, comprising:

• a cartridge having a first surface through which ink is discharged during a printing operation, the ink being discharged from said cartridge to a recordable medium, said cartridge being transported back and forth along a first line of motion;
• a reservoir being attached to said cartridge and containing the ink;
• a first print head being attached to said first surface and comprising a first plurality of nozzles forming at least two rows substantially perpendicular to said first line of motion, said at least two rows including at least a first row parallel to a second row, said first row of nozzles including a first bottom nozzle and a first top nozzle, all adjacent nozzles in said first row of said first plurality of nozzles being separated from each other by an equal distance, said first print head having a first printing height, said first printing height corresponding to a distance from said first bottom nozzle up to said first top nozzle measured in a direction substantially perpendicular to said first line of motion, said equal distance being measured in the direction substantially perpendicular to said first line of motion;
• a second print head being attached to said first surface and comprising a second plurality of nozzles forming at least one row, all adjacent nozzles in said at least one row of said second plurality of nozzles being separated from each other by said equal distance, said second print head having a second printing height, said at least one row of nozzles including a second bottom nozzle and a second top nozzle, said second printing height corresponding to a distance from said second bottom nozzle up to said second top nozzle measured in the direction substantially perpendicular to said first line of motion;
• a first supply pipe supplying the ink from said reservoir to said first print head;
• and
• a second supply pipe supplying the ink from said reservoir to said second print head, said first and second supply pipes being separately located;
• said first print head and said second print head being positioned with said at least two rows of said first plurality of nozzles being parallel to said at least one row of said second plurality of nozzles, said cartridge having a total printing height corresponding to a height from said second bottom nozzle up to said first top nozzle as measured in the direction perpendicular to said first line of motion with said first and second print heads being attached to said first surface, said total printing height being substantially equal to the sum of both said first printing height and said second printing height, said first bottom nozzle being separated from said second top nozzle by said equal distance as measured in the direction perpendicular to said first line of motion, said apparatus being for monochrome printing.

A cartridge for an electrophotographic apparatus, comprising:

• a body having a first surface through which an ink is discharged, the ink being discharged from said body to a recordable medium during a printing operation, said body being transported back and forth along a first line of motion during the printing operation;
• a reservoir being attached to said body and containing the ink;
• a first print head being attached to said first surface and comprising a first plurality of nozzles forming at least one row arranged to be substantially perpendicular to said first line of motion, said at least one row of said first plurality of nozzles forming a substantially straight line, said at least one row of said first plurality of nozzles including a first bottom nozzle in an lowest position of said first print head and a first top nozzle in a highest position of said first print head, all adjacent nozzles in said at least one row of said first plurality of nozzles being separated from each other by an equal distance, said first print head having a first printing height, said first printing height being measured from said first bottom nozzle directly to said first top nozzle;
• a second print head being attached to said first surface and comprising a second plurality of nozzles forming at least one row arranged to be substantially perpendicular to said first line of motion, said at least one row of said second plurality of nozzles forming a substantially straight line, said at least one row of said second plurality of nozzles including a second bottom nozzle in a lowest position of said second print head and a second top nozzle in a highest position of said second print head, all adjacent nozzles in said at least one row of said second plurality of nozzles being separated from each other by said equal distance, said second print head having a second printing height, said second printing height being measured from said second bottom nozzle directly to said second top nozzle;
• a first supply pipe supplying the ink from said reservoir to said first print head;
• and
• a second supply pipe supplying the ink from said reservoir to said second print head, said first and second supply pipes being separately located;
• said first print head and said second print head being positioned with said at least one row of said first plurality of nozzles being substantially parallel to said at least one row of said second plurality of nozzles, said cartridge having a total printing height corresponding to a height from said second bottom nozzle up to said first top nozzle as measured in a direction perpendicular to said first line of motion with said first and second print heads being attached to said first surface, said total printing height being substantially equal to the sum of both said first printing height and said second printing height, said first bottom nozzle being separated from said second top nozzle by said equal distance as measured in the direction perpendicular to said first line of motion.

A method, comprising:

• forming a cartridge having a first surface through which ink is discharged, the ink being discharged from said cartridge to a recordable medium during a printing operation, said cartridge being transported back and forth along a first line of motion;
• storing ink in an ink reservoir in said cartridge;
• attaching a first print head to said first surface of said cartridge, said first print head comprising a first plurality of nozzles forming at least one row substantially perpendicular to said first line of motion, said at least one row of said first plurality of nozzles forming a substantially straight line, said at least one row of said first plurality of nozzles including a first bottom nozzle in a lowest position of said first print head and a first top nozzle in a highest position of said first print head, all adjacent nozzles in said at least one row of said first plurality of nozzles being separated from each other by an equal distance, said first print head having a first printing height, said first printing height being measured from said first bottom nozzle to said first top nozzle in a direction perpendicular to said first line of motion;
• attaching a second print head to said first surface, said second print head comprising a second plurality of nozzles forming at least one row substantially perpendicular to said first line of motion, said at least one row of said second plurality of nozzles forming a substantially straight line, said at least one row of said second plurality of nozzles including a second bottom nozzle in a lowest position of said second print head and a second top nozzle in a highest position of said second print head, all adjacent nozzles in said at least one row of said second plurality of nozzles being separated from each other by said equal distance, said second print head having a second printing height, said second printing height being measured from said second bottom nozzle to said second top nozzle in the direction perpendicular to said first line of motion;
• arranging said first print head and said second print head on said first surface with said at least one row of said first plurality of nozzles being substantially parallel to said at least one row of said second plurality of nozzles, said cartridge having a total printing height corresponding to a height from said second bottom nozzle up to said first top nozzle as measured in the direction perpendicular to said first line of motion with said first and second print heads buffing attached to said first surface, said total printing height being substantially equal to the sum of both said first printing height and said second printing height, said first bottom nozzle being separated from said second top nozzle by said equal distance as measured in the direction perpendicular to said first line of motion;
• conveying the ink from said reservoir to said first print head through a first supply pipe;
• conveying the ink from said reservoir to said second print head through a second supply pipe;
• and
• ejecting the ink from said reservoir through said nozzles of said first print head to a recordable medium during the printing operation, and ejecting the ink from said reservoir through said nozzles of said second print head to the recordable medium during the printing operation.