Gap adjusting device of an impact dot printer

Details Gap adjusting device of an impact dot printer Gap adjusting device of an impact dot printer

1997-05-27

1998-01-06

Hilten, John S.

Typewriting machines

Including adjustment for optimum printing plane

400 56, B41J 1120

Patent

active

057047219

ABSTRACT:
A gap adjusting device moves a print head vertically via a carriage shaft eccentrically supported by a displacement gear. The displacement gear is provided with a gap lever, which restricts rotational movement of a driving force transmission mechanism by abutting on a stop when a pulse motor drives the print head to move away from a platen. The pulse motor becomes out of phase, thereby defining the position as a reference position. The amount of rotation of the pulse motor is adjusted, starting from the reference position, thereby adjusting a vertical position of the print head. The reference position of the print head is established without the risk of causing damage to dot pins, by defining the initial condition of the pulse motor.

REFERENCES:
patent: 4652153 (1987-03-01), Kotsuzumi et al.
patent: 4906115 (1990-03-01), Bischof
patent: 5193918 (1993-03-01), Lohrmann et al.
patent: 5486063 (1996-01-01), Fox et al.
patent: 5529405 (1996-06-01), Breitenbach et al.

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