Method of controlling an ink ribbon moving speed in a dot line p

Details Method of controlling an ink ribbon moving speed in a dot line p Method of controlling an ink ribbon moving speed in a dot line p

1991-02-22

1992-10-20

Wiecking, David A.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400225, 400323, B41J 3336

Patent

active

051564742

ABSTRACT:
In a shuttle dot line printer including a hammer bank shuttling back and forth at a given speed in a direction to transverse a sheet of print paper while turning around at two opposite ends, and an endless ink ribbon uni-directionally moving through a space between the hammer bank and the sheet of print paper, the ink density of the characters printed when the hammer bank is moving in the direction opposite to the ink ribbon is lowered. To prevent such occurrence, the ink ribbon is moved at a low speed lower than a regular speed when the moving direction of the hammer bank is opposite to that of the ink ribbon. On the other hand, when the moving direction of the hammer bank is same as that of the ink ribbon, the ink ribbon is moved at the regular speed after a predetermined period of time has been expired when the hammer bank turns around at one end and starts moving in the same direction as the ink ribbon.

REFERENCES:
patent: 4286888 (1981-09-01), Bennett
patent: 4300847 (1981-11-01), Hoffman
patent: 4558963 (1985-12-01), Applegate
patent: 4728206 (1988-03-01), Mori
patent: 4850725 (1989-07-01), Walker
IBM Technical Disclosure Bulletin, vol. 29, #11, "Mechanical Ribbon Saver . . . ", Apr. 1987.
IBM Technical Disclosure Bulletin, vol. 30, #8, "Ribbon Feed Mechanism . . . ", Jan. 1988.

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