Abstract: A printing device, including: a mechanical energy storage mechanism for storing mechanical energy; and a mechanical energy application mechanism for carrying a sheet and/or printing on the sheet, using the mechanical energy stored.

Abstract: A print head drive mechanism utilizing a lead screw is provided. In one embodiment, the print head drive mechanism comprises a lead screw that is coupled to the print head and extends through the threaded hub of a gear. The gear is driven by a stepper motor through a pinion. A support cylinder extends from one face of the gear and includes a tapered nose that seats within a recess in a brace. The thread pitch of the lead screw matches the jet spacing in the print head to minimize positional offsets due to component irregularities and misalignments. In another embodiment, the print head is coupled to at least one nut that is translated by a rotating lead screw, with the lead screw having a thread pitch that matches the jet spacing in the print head.

Abstract: An electronic typewriter has a reduced number of electrically-powered actuators and comprises a motor powering a differential motion transmission unit having first and second output members. Transmission control means powered by a solenoid moves a slider to engage stop members selectively with the first and second output members to permit the second and first output members respectively to rotate. The first output member drives the carriage transport mechanism. The second output member drives the character carrying element and also powers function devices, namely a correction device, through a motion switching mechanism controlled by a switch control mechanism including another solenoid. The typing ribbon feed is driven by reciprocation of the slider between its two states. The motor is mounted on the frame and drives the motion transmission unit on a carriage through a belt; it also drives a line spacing mechanism through a clutch operated by a further solenoid.

Abstract: Disclosed is a travelling control of printing head in which when a printing head is to be returned to its home position, the printing head is returned in a selected one of two modes, the first mode being such that a lead screw is reversely rotated upon completion of a desired printing operation to cause the printing head to return to its home position through a first guide groove provided for the forward travelling of the printing head and the second mode being such that the lead screw is rotated forward even after the completion of the desired printing operation and the guide groove is changed from the first one to a second one which is provided only for the return travelling of the printing head and which has a pitch larger than that of the first one so that the printing head can be quickly returned to its home position at a speed higher than that in the forward travelling.

Abstract: In a printer for desk calculators etc., return control means is disposed in order to control return means for resetting a carriage as well as a hammer to a starting position. When a type wheel has been shifted to a specified position in a carry direction and has opposed to the hammer at a specified rotational position, the return control means actuates the return means on the basis of a next carry operation.

Abstract: A thermal printer paper feeding mechanism having a reciprocable print head carrier. A paper feeding roller has a ratchet cross section with the ratchet teeth twisted along the length of the paper feed roller. The paper feed roller rotates for advancing paper to be printed on while the print head carrier returns to a start position after having printed a line.

Abstract: A printer for printing characters on paper supported adjacent a path along which a print head can be traversed. Two servo-motors are mounted adjacent the path and each connected to the head by a toothed belt. Control means connects the servo-motors in one of two modes: in the first, one servo-motor is energized to pull the head on a printing traverse while the other servo-motor is connected as a dynamic brake; and in the other, the other servo-motor is energized to pull the head on a fly-back traverse while the other servo-motor idles. To stop the head either in a printing traverse or at the end of a fly-back traverse, the mode of connection of the control means is reversed.

Abstract: A printer device using thermosensitive paper as a printing medium includes a thermal head for effecting printing on the printing medium, and means for moving the printing medium and the thermal head relative to each other. An electromagnetic plunger and a spring member for urging the thermal head against the printing medium are provided. The plunger serves to control the printing and, in addition, urges the thermal head against the printing medium with a predetermined pressure force, and the spring member is controlled during the relative movement between the thermal head and the printing medium along a print line on the medium, to urge the thermal head against the printing medium with a lower pressure force.