Typewriting machines – Means auxiliary to typewriting function – Indicator means
Patent
1978-11-20
1981-03-10
Crowder, Clifford D.
Typewriting machines
Means auxiliary to typewriting function
Indicator means
400282, 4005833, 271261, B41J 2500, B41J 2530
Patent
active
042550645
ABSTRACT:
In order to ensure correct registration of printing, a printing device is provided with a transducer arrangement which scans the printing platen to detect one of the edges of the stationary or, in the case of continuous feed stationery, pre-printed markings on the stationery. The scanning may take place in the vertical and/or horizontal directions according to the direction in which precise registration is desired. The transducer arrangement is provided with an associated light source and to avoid errors arising, e.g. from variations in ambient lighting level, the transducer arrangement comprises two sensors which are spaced apart in the direction of scanning and an associated circuit forms a difference signal from the outputs of the sensors, which is discriminated with respect to a predetermined threshold level to produce a signal representative of the edge or marking. In a second embodiment the sensors are spaced apart along a line which is inclined relative to the vertical and horizontal directions so that both vertical and horizontal registration may be achieved using only two sensors provided, of course, that vertical and horizontal movements of the stationery do not occur simultaneously.
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Smith, "Paper Edge Sensing," IBM Technical Disclosure Bulletin, vol. 20, No. 3, Aug. 1977, p. 904.
Crawford et al., "Tape-Presence Sensor," IBM Technical Disclosure Bulletin, vol. 20, No. 3, Aug. 1977, pp. 1198-1199.
Wipke, "Right Hand Margin Set and Print Inhibit," IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978, pp. 3996-3997.
A.E.S. Wordplex Limited
Crowder Clifford D.
Eslinger Lewis H.
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