Abstract: A digital data recording and reproducing system comprises a data input part and a data output part. Input data is manipulated through a computer system unit. The computer system unit comprises at least one of: a data retention part to store the digital data, a personal identification part to verify whether a user operating the digital data recording and reproducing system is authorized or not, an access log recording part to record that the user has accessed the data retention part, a falsification detection part to detect whether data stored in the data retention part is falsified or not, and a history data recording part to record information on changes or corrections in the data retention part.

Abstract: A method of controlling data sending and receiving operations between two microprocessors, in which a second controlled-side microprocessor receives a selected signal which is one of a data sending request signal and a data receiving request signal from a first controlling-side microprocessor and the second microprocessor also receives a resultant select signal produced by a logical OR operation on both request signals and determines if the selected signal indicates a "receiving request" or a "sending request" at the same time that it responds to the resultant select signal, thereby executing the requested operation. Hence, even if the second microprocessor does not receive the resultant select signal and the sending/receiving signal at the same time, the second microprocessor can determine simultaneously with the receipt of the resultant select signal if it should send or receive the data, resulting in high-speed data processing.

Abstract: A dot print head includes an armature assembly constructed by providing an armature guide holding a plurality of armatures for swing motion in a cup-shaped housing having one open end, slidably guiding a plurality of print wires attached to the inner ends of the armatures by a wire guide, interposing armature return springs between the armatures and the armature guide, disposing an armature stopper in contact with the backsides of the armatures opposite to the front sides of the same facing the armature guide, and disposing stopper seats between the inner surface of the bottom wall of the housing and the inner surface of the armature stopper; and a yoke assembly joined and fastened to the armature assembly with fastening members.

Abstract: The present invention provides a compact dot matrix print head comprising a housing internally provided with print wires, electromagnets for driving the print wires, a printed wiring board having a diameter smaller than the outside diameter of the rear end of the housing, fixedly joined to the rear end of the housing and provided with wiring patterns connected to the coils of the electromagnets, connectors connected to the outer surface of the printed wiring board so that the conductors thereof are connected electrically to the wiring patterns, and flexible cables each having one end connected to the connector and the other end connected to a driving unit for driving the electromagnets.

Abstract: A dot print head comprising a yoke, a plurality of cores formed integrally with the yoke in an annular arrangement in the peripheral portion of the yoke, solenoid coils wound respectively around the cores, armatures fixedly provided respectively with styluses, an armature support supporting each armature at the middle portion thereof opposite to the corresponding core for swing motion, and an armature holding member disposed opposite to the yoke with a predetermined gap therebetween to hold the armatures on the armature support for swing motion. A plurality of joining parts are formed on the yoke on a line on which the cores are arranged, and a plurality of joining parts are formed on the armature holding member so as to be joined respectively to the connecting parts of the yoke in joining together the yoke and the armature holding member.