Electrode assembly having particular pressing plate and backplane board arrangement for facsimile machine

Claim 1

Electrostatic printing apparatus comprising a large-area support plate disposed horizontally and having a horizontal top surface and a vertical front surface, a stylus board having an edge, along which a plurality of styli are disposed, said stylus board being rigidly secured to said vertical front surface of said support plate, said stylus board being disposed vertically and its styli being disposed vertically, a backplane board disposed transverse to said stylus board and in contact therewith, said backplane board having a rear surface and also having a front surface on which a plurality of backplane electrodes are positioned in operative relationship with said styli, said stylus board and said backplane board being adapted to receive a sheet of message paper between them, a strip of resilient material disposed along said rear surface of said backplane board in alignment with said backplane electrodes, and means pressing on said strip of resilient material and causing said backplane board to bear against said stylus board, said means comprising an elongated plate bearing on said strip and said backplane board under the force of gravity.