Imprinter apparatus with changeable cassette imprint roller structure

Imprinter apparatus for imprinting characters from a character imprint source member onto imprint recording sheet material such as document sheets or the like, comprising an imprinter means housing section including a casing having movable roller means for transversely rectilinearly traversing a path laterally spanning an imprint station and drive means for moving said roller means back and forth along said path, the roller means including a horizontally slidable carrier block member and a changeable cassette carried thereby having a changeable vertically slidable roller block member and a vertically elongated generally cylindrical imprinter roller rotatably carried by said roller block member, the drive means comprising a pair of spaced-apart rotatable sprockets and an endless drive chain trained about said sprockets, the drive chain having a spud projecting therefrom, a pair of vertically spaced guide track members engaging and slidably supporting said carrier block member to guide the carrier block member and roller block member carried threby along said path, the carrier block member having a slot receiving said spud therein for driving the carrier block member and roller block member and roller carried thereby back and forth through advance and return strokes spanning said imprint station as the spud moves with said drive chain between said sprockets, said carrier block member having roller block support means movable from an operative position for imprinting document sheets to a release portion for removal and replacement of the roller block member and roller carried thereby, and a carrier member hinged for movement about a pivot axis to said housing section adjacent the path traversed by the roller means at said imprint station, said carrier member having a recess for receiving the imprint source member therein and a pocket formation for the recording sheet material, the carrier being movable about said pivot axis between an open position exposing said recess and pocket formation for introduction and withdrawal of the source member and sheet material and a closed position locating the sheet material and source member at said imprint station, said roller upon movement of said carrier block member and roller block member and its roller through said advance stroke by said spud and drive chain pressing the sheet material by said roller against said source member to produce a character imprint thereon.