Adaptive high speed serial printer
AssigneeFujitsu Limited
InventorsMasahisa Narita, Osamu Tomita
Life of this patent
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Abstract
The present invention relates to a serial printer comprising the mechanism for selecting one type by moving the mounted printing wheel and the carrier for moving said mechanism on the print sheet, has the object that the printing can be done at the maximum speed which is the optimum for the print wheel even in case any kind of printing wheel is mounted and is characterized in that the carrier shifting speed can be changed in accordance with the inertia of printing wheel and a shifting distance of printing wheel.
Claims11
An adaptive high speed serial printer operatively connected to an external source having a selection amount data, for printing on a record media, comprising:
- a platen for supporting the record media;
- a carrier for traversing back and forth along said platen;
- a printing wheel, selected from a plurality of printing wheels, mounted on said carrier, said printing wheel having a plurality of type elements;
- selecting means, mounted on said carrier, for moving a selected one of said plurality of type elements to a hammering position located in front of said platen by rotating said printing wheel;
- hammering means for impacting said selected one of said plurality of type elements with said platen;
- spacing means, coupled to said carrier, for correctly spacing said carrier along said platen at a spacing speed in dependence upon a command signal;
- and
- control means, operatively connected to receive the selection amount data from the external source, comprising:
- selecting control means for controlling the movement of said selecting means so as to rotate said selected one of said plurality of type elements to the hammering position between said hammering means and said platen in accordance with the selection amount data which indicates the distance from the present position of said selected one of said plurality of type elements to said hammering position;
- hammer control means, connected to said hammering means, for controlling the impact timing of said hammering means;
- signal generating means for generating a signal corresponding to the inertia of said printing wheel, selected from said plurality of printing wheels, mounted on said carrier;
- and
- carrier control means, operatively connected to said signal generating means, said spacing means and the external source, for generating the command signal for controlling the spacing speed of said carrier as it moves along said platen, the command signal being generated in accordance with the selection amount data and the signal corresponding to the inertia of said printing wheel.
A control circuit for an adaptive high-speed serial printer including a type wheel selected from a plurality of type wheels, each having an inertia and a plurality of type elements each of which has a corresponding selected speed data, hammering means, a carriage, and a transducer for generating an analog signal indicating a distance between the present position of the carriage and the object position of the carriage, the control circuit being operatively connectable to an external control system which provides a selection amount data, comprising:
- a position control circuit, operatively connected to the transducer and the carriage, for receiving the analog signal, for generating a position pulse signal, and for controlling a spacing speed of the carriage as it moves from the present position to the object position in dependence upon the inertia of the selected type wheel and the selection amount data;
- a hammer control circuit, operatively connected to said control system and the hammering means, for receiving the position pulse signal and activating the hammering means when the moving carriage is passing the object position;
- and
- a target speed setting circuit, operatively connected to said position control circuit, for receiving and storing the corresponding selected speed data for each of the plurality of type elements of the type wheel and for generating the spacing speed signal to said position control circuit to control the carriage as it moves from the present position to the object position, comprising:
- a register, operatively connected to the external control system, for storing the selection amount data from the external control system and outputting a selection amount data signal.
Dependencies are inferred from the claim text.