Printer having erasing mechanism for repeated erasure

Details Printer having erasing mechanism for repeated erasure Printer having erasing mechanism for repeated erasure

1993-06-28

1994-09-27

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Means for correcting typing errors

4001442, 4006971, B41J 29373

Patent

active

053502477

ABSTRACT:
A printer capable of completely erasing printed characters while reducing noise which may be generated during the erasure. After an erase key is manipulated and the holder member is moved to its erase position, a motor is energized and driven at a motor current level of I1 and I2 from a time t0 when the erasing operation starts. A print hammer strikes onto a printing paper through a type and a correction ribbon at a hammer speed of V1. Thereafter, motor current level of I3 is applied to the motor, so that the print hammer presses the printing paper at a contacting pressure of P1. In the subsequent erasure operation, the motor current level of I11 and I12, which are smaller than I1 and I2 in the first erasure are applied to the motor. Thus, the hammer speed when striking onto the printing paper by the hammer is lower than V1. Accordingly, contacting pressure of the print hammer onto the printing paper becomes P11, which is smaller than P1 of the first erasure.

REFERENCES:
patent: 4307971 (1981-12-01), Kane, III et al.
patent: 4572687 (1986-02-01), Croley et al.
patent: 4692045 (1987-09-01), Makita
patent: 5171094 (1992-12-01), Kawamura
patent: 5244289 (1993-09-01), Sasaki

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