Printhead Assembly With Guide Bar
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
The drawings show a thermal printer with lift-off correction, such as described in U.S. Patent 4,384,797, in which guide bar 1 is brought forward to accomplish correction. Nip rolls 3 and 5 feed ribbon 7 from a location past the printhead 9. Ribbon 7 is free to be pulled from a supply roll (not shown) on the opposite side of the print station. Guide bar 1 is spring-mounted on arm 11 to be held back (Fig. 2) by solenoid-controlled interposer 13 during printing. At the start of an erasure operation, guide bar 1 encounters platen 15 slightly before the end of printhead 9 encounters platen 15, thereby avoiding a stretching of ribbon which would occur if printhead 9 trapped the ribbon prior to movement of the guide bar 1.