Multi-speed cooling fan for printing device

Details Multi-speed cooling fan for printing device Multi-speed cooling fan for printing device

1987-10-13

1989-06-27

Wright, Jr., Ernest T.

Typewriting machines

Miscellaneous

400679, B41J 2900

Patent

active

048424315

ABSTRACT:
A cooling fan control device for regulating the speed of a fan cooling a printing device. The control includes apparatus for determining whether a printing head and a paper feeder are to be driven, and when at least one of the printing head or paper feeder is to be driven, the cooling fan is driven at a high speed, while when neither the printing head nor the paper feeder is to be driven, the cooling fan is driven at a low speed. In a further aspect, the printing device sequentially adds the number of dots printed to a value previously stored in a memory and a subtracting device subtracts a predetermined value from the dot number newly stored in the memory every predetermined time. A comparison is made to determine whether the updated dot number stored in the memory is equal to or less than the reference value, and the cooling fan control operates in such a manner that if the updated dot number is more than the reference value, the cooling fan continues to be rotated at a fixed speed, while on the other hand, when the updated dot number is equal to or less than the reference value, the rotating speed is reduced or nullified.

REFERENCES:
patent: 4265337 (1981-05-01), Dammeyer
patent: 4496824 (1985-01-01), Kawai et al.
patent: 4540295 (1985-09-01), Okunishi et al.
patent: 4541747 (1985-09-01), Imaizumi et al.
patent: 4574226 (1986-03-01), Binder
patent: 4639650 (1987-01-01), Nakai
patent: 4664542 (1987-05-01), Tsugita

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