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US 4,542,998 AGranted
Character set printing means utilizing rolling pressure contact for printing
AssigneeNCR Corporation
InventorsMiroslav S. Osmera, Van-Minh Huynh, Trevor A. Calnek
Life of this patent
Estimating the term…
Abstract
A printing apparatus is provided which utilizes rolling pressure contact for printing, and includes a plurality of sets of serially arranged character elements mounted for movement on the external surface of a printing drum. Movement of the sets to place a desired character into printing position is accomplished by controlling the speed of a motor driving a pulley connected by cable to a given character set, relative to the speed of a motor driving the printing drum in rotational movement.
Claims15
A printer for recording data on a medium comprising:
- drum means rotatable about its longitudinal axis and having a printing position along a line on its surface defined by an intersection with the surface of a plane perpendicular to said axis;
- drive means for driving said drum means in rotational movement around its longitudinal axis;
- rotatable roller means positioned adjacent said drum means at said printing position and cooperating with said drum means to effect rolling contact pressure printing;
- a plurality of character sets mounted for movement on the outer surface of said drum means in either of two opposite directions, each character set comprising a plurality of individual character elements serially connected to each other;
- positioning means for moving each character set individually as the drum means rotates to place a predetermined character of each set at the printing position of the drum means, said positioning means for each character set including a cable which is connected to each character set, a pulley to which the cable is connected, and a positioning motor to drive each pulley;
- and
- means for controlling the operation of the positioning means whereby selected characters of each of the character sets are located at the drum means printing position to cooperate with said roller means to effect continuous printing as the drum means rotates,
- said means for controlling also including first velocity detecting means coupled to the drive means and second velocity detecting means coupled to the positioning motor, and control means coupled to the first and second velocity detecting means for controlling the relative speeds of the positioning motor and the drive means, whereby movement of the character sets with respect to the drum means is accomplished by changing the relative speeds of the positioning motors with respect to the drive means.
5 more elements
A printer for recording data on a medium comprising:
- rotatable print character support means having a printing position on the surface thereof;
- drive means for driving said support means in rotational movement;
- at least one character set mounted for movement with respect to the outer surface of said support means, said character set comprising a plurality of character elements;
- positioning means including a positioning motor operating at predetermined relative speeds with respect to the drive means for moving each character set individually as the support means rotates to place a predetermined character at the printing position of the support means;
- and
- means for controlling the operation of the positioning means.
3 more elements
A printer for recording data on a medium comprising:
- rotatable print character support means having a printing position on the surface thereof;
- drive means for driving said support means in rotational movement;
- at least one character set mounted for movement with respect to the outer surface of said support means, said character set comprising a plurality of character elements;
- positioning means including a positioning motor operating at predetermined relative speeds with respect to the drive means for moving each character set individually as the support means rotates to place a predetermined character at the printing position of the support means, said positioning means for each character set including a cable which is connected to each character set, and a pulley driven by the positioning motor and to which the cable is connected;
- and
- means for controlling the operation of the positioning means, including first velocity detecting means coupled to the drive means and second velocity detecting means coupled to the positioning motor, and control means coupled to the first and second velocity detecting means for controlling the relative speeds of the positioning motor and the drive means, whereby movement of the character sets with respect to the support means is accomplished by changing the relative speeds of the positioning motors with respect to the drive means.
3 more elements
Dependencies are inferred from the claim text.