Microchannel print head for electrographic printer

An electrographic printing method, comprising the steps of:

• a) supplying a magnetic developer to a print head;
• b) confining the developer at the print head with an array of microchannels to form a plurality of parallel lines of developer in the microchannels, the microchannels being at least 10 times longer and at least twice as deep as they are wide;
• and
• c) selectively transferring developer in an imagewise manner from the lines to a receiver.

Electrographic printing apparatus for forming a toner image on a recording medium, comprising:

• a) a magnetic brush having a magnetic core and an outer shell;
• b) a developer supply for supplying a magnetic developer powder to the magnetic brush;
• c) a print head adjacent the outer shell, the print head defining an array of microchannels for forming a plurality of parallel lines of developer in the microchannels, the microchannels being at least 10 times longer and at least twice as deep as they are wide, and including means for selectively transferring developer from the lines to a receiver;
• and
• d) a receiver electrode arranged in spaced relation to the array of microchannels to define a recording region through which the receiver can be moved.