Printer apparatus with automatic gap adjusting mechanism

Details Printer apparatus with automatic gap adjusting mechanism Printer apparatus with automatic gap adjusting mechanism

1987-10-27

1989-03-14

Pearson, Charles

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400 59, 318696, B41J 1120

Patent

active

048120596

ABSTRACT:
A printer apparatus including a timer, for setting a period T1 when the print head moves forward toward a platen, and a period T2, which is longer than period T1, when the print head moves away from the platen. In response to an interrupt signal from the timer, a CPU supplies a signal, for changing over the exciting phase of the stepping motor, to a motor driving circuit. As a result, the motor driving circuit operates to speed up the rotation of the stepping motor when the print head moves forward, providing a low level of torque with which to move the print head toward the platen. On the other hand, the motor driving circuit operates to slow down the rotation of the stepping motor when the print head moves away from the platen, providing a high level of torque with which to move the print head away from the platen.

REFERENCES:
patent: 4203678 (1980-05-01), Nordstrom et al.
patent: 4340848 (1982-07-01), Hanagata et al.
patent: 4540927 (1985-09-01), Tanimoto
patent: 4652153 (1987-03-01), Kotsuzumi et al.
patent: 4676675 (1987-06-01), Suzuki et al.

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