Abstract: To reduce the extremely high wear in steel belt printers, a revolving tape is arranged between the revolving steel belt and the platen.

Abstract: From the variables print hammer magnet voltage, print hammer magnet temperature, impact force, and a value derivable from the actual print time, a control voltage, which correspondingly delays an early trigger pulse by means of a variable delay element, is determined in an "open" control loop. The variables are analogously combined by adding, subtracting, and multiplying the analogue values, and by subsequently forming a weighted sum.

Abstract: Impact printing apparatus for recording at different character densities having an interposer unit movable between a plurality of print hammers and type chain to provide a translation function for the variable character-to-character distances required of the different character densities. During low density recording the interposer unit renders ineffective certain of the print hammers otherwise used for the higher density. A single type chain may be used with different interposer arrangements to obtain the various densities or type chains of different densities can be used.

Abstract: Print hammer actuating apparatus of the double lever type in which one lever is moved in response to an input force and carries a pivotally mounted second lever which provides the output force through either an "inertia" principle or "ratio" principle. The angular velocity of the first lever is multiplied through those principles to provide greater impact velocity at the output of the second lever without requiring an increase of the input energy.