Hitachi Koki Co., Ltd.

Toshiyuki Suzuki

Masami Iwama

Takeshi Taniguchi

Hiroyuki Takahashi

Rui Akiba

Kenichi Tetsu

Kohichi Yageta

Shota Kanno

Mitsuru Kawakami

Battery

Each of the rotors has a plurality of identification marks arranged on a circumference defined by the rotation axis on a surface thereof with angular intervals which are determined for each of the different rotors. The identification marks are detected with an identification mark detector such as a magnet detector. The rotational speed of the rotation axis is detected. The angular intervals are detected to identify the attached rotor. The rotating speeds are measured from the pulses at first detection of one of the identification marks and second detection of the one of identification marks after one rotation of the rotation axis. The time intervals of the identification marks between the first and second detection are measured. The angular intervals are calculated by integrating the measured rotating speeds with the time intervals, respectively.

Centrifugal separator with rotor identification

In a dot line printer having a plurality of print hammers which are arranged to print a plurality of dot lines simultaneously when a hammer bank on which the print hammers are mounted performs one scan from one extreme to another, the dot lines originally assigned to the print hammers for printing are changed provided that a particular print hammer is driven an undue number of times when the originally assigned positions of the print hammers are maintained in the subsequent scans of the hammer bank.

Dot line printer for preventing the overheating of printing elements by

To prevent effective print speed from being lowered, a counter is provided for each of a plurality of print hammers. A number of times a print hammer is driven during one print phase having a predetermined period of time is counted by the counter. The counted value is compared with a reference value, and when the counted value has reached the reference value during the print phase, driving of the print hammer is halted until the end of the print phase. A reference value is changed based on the number of times the print hammer is driven during a previous print phase immediately before the present print phase. The reference value represents an allowable number the print hammer can be driven during each of successive print phases.

Method and device for limiting a number of times each print hammer is

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Hitachinaka, Japan

Toshiyuki Suzuki