Method and apparatus for preventing the overheat of a line feed

Details Method and apparatus for preventing the overheat of a line feed Method and apparatus for preventing the overheat of a line feed

1988-07-25

1989-11-28

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 28, 361 31, 361 78, 318603, 388912, 388934, 388811, H02H 600

Patent

active

048841625

ABSTRACT:
A method and apparatus prevents the overheating of a line feed motor used in a printer. First and second timers are respectively provided to measure first and second time intervals. The second time interval includes a cessation period in which the line feed motor is not driven to allow for heat dissipation of the line feed motor. At the end of the first time interval, a determination is made as to whether the number of line feed pulses during the first time interval exceeds a predetermined limit. If the number of line feed pulses does not exceed the predetermined limit, the first time is reactivated. If the number of line feed pulses does exceed the predetermined limit, then the second timer is activated to allow for heat dissipation of the line feed motor.

REFERENCES:
patent: 3860861 (1975-01-01), Gucker
patent: 4524368 (1985-06-01), Inui et al.
patent: 4541747 (1985-09-01), Imaizumi et al.
patent: 4611155 (1986-09-01), Kurakake
patent: 4638329 (1987-01-01), Nakayama et al.
patent: 4649401 (1987-03-01), Kojima et al.
patent: 4663734 (1987-05-01), Berry
patent: 4688051 (1987-08-01), Kawakami et al.

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