Apparatus for confirming the correct impression of printing char

Details Apparatus for confirming the correct impression of printing char Apparatus for confirming the correct impression of printing char

1976-06-22

1977-06-07

Coven, Edward M.

Textiles: fiber preparation

235153AS, 197 19, 101 9315, 197 82, B41J 104

Patent

active

040277640

ABSTRACT:
An apparatus for confirming the correct impression of printing characters wherein any of the characters arranged in at least one line circumferentially extending on the peripheral surface of a cylindrical printing drum is designated by controlling the operation of the printing drum to be brought to a prescribed printing position on the surface of the recording medium for printing and the printing drum can be moved in the axial direction, and which comprises a detector for detecting a circumferential angle defined by the position of the selected one of said linearly arranged characters with a point of referential angle provided on the rotating printing drum; a counter for counting signals denoting the steps of the rotation of said printing drum required for said selected character to take a desired printing position; and a comparison circuit for comparing a number of rotation steps required for the printing drum to return to the point of a referential angle after impression of one line of characters on a recording medium is brought to an end and a number of rotation steps required for the printing drum to run through a circumferential angle defined by the position of the terminal character of the respective lines impressed on the recording medium with the referential angle point, thereby finding an error, if any, occurring in impressing the respective lines on the recording medium.

REFERENCES:
patent: 3374873 (1968-03-01), Takenaka
patent: 3599772 (1971-08-01), Comstock
patent: 3630335 (1971-12-01), Chamness
patent: 3710912 (1973-01-01), Bretti et al.
patent: 3795300 (1974-03-01), Matsuzawa
patent: 3957151 (1976-05-01), Kashio

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