Printing apparatus and method for preventing printing errors in

Details Printing apparatus and method for preventing printing errors in Printing apparatus and method for preventing printing errors in

1982-03-23

1983-08-16

Sewell, Paul T.

Typewriting machines

Including selection of type-face by...

Including error detection

318565, 400 54, 4001442, B41J 130, B41J 796

Patent

active

043988377

ABSTRACT:
A printing apparatus comprising a print wheel having a multiplicity type elements, and a detecting unit for detecting angular positions of the print wheel including its fixed home position. The apparatus further comprises a control unit which includes a first counter which stores data representative of an angular distance of a type element currently located at the printing position as measured from the home position, and a second counter which stores data representative of an angular position of a type element designated by a print signal. Both counters are operated as they receive position signals from the detecting unit. The control unit is so arranged that in the event of an unexpected rotation of a wheel driving rotary shaft which is not a result of the actuation of a wheel driving motor in response to the print signal, the print wheel is first reset to the home position before it is rotated to bring a designated type element to the printing position, whereby chances for printing errors due to such unexpected rotation are eliminated. A method for controlling to prevent the printing errors is also disclosed.

REFERENCES:
patent: 4143980 (1979-03-01), Giebler et al.
patent: 4178108 (1979-12-01), Kane
patent: 4279523 (1981-07-01), Ringle
patent: 4291620 (1981-09-01), Yamasaki et al.

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