Optical element actuating device for phototypesetter

Details Optical element actuating device for phototypesetter Optical element actuating device for phototypesetter

B - Operations, Transporting

41

B

95/16

B41B 21/20 (2006.01)

Patent

CA 1099975

ABSTRACT OF THE DISCLOSURE A phototypesetter is disclosed having a stepping motor which actuates an escapement carriage coupled to an elongated carriage driving member. A projection lens carriage and a collimating lens carriage are selectively electromagnetically coupled to the elongated driving member, thereby to project images of varying character sizes through a focusing lens coupled to the escapement carriage, which sequentially projects focused character images across a photosensitive film on a line by line basis. A track select mirror is also selectively electromagnetically coupled to the elongated driving member for selectively projecting one of a plurality of tracks bearing characters of differing fonts carried by a rotatable font carrier element. A group of custom- ized lens carriage positioning control codes and customized sizing codes, unique for equine phototypesetter as a function of lens parameter variations, are stored within a size dictionary and a particular set, associated with the character size being typeset is read out of the dictionary and is employed to control the customized positioning of the lens carriages and image (film) positioning stepping motors. A novel technique is also disclosed whereby a customized group of the above-mentioned codes is rapidly and easily generated by an iterative image inspection process for each particular phototypesetter during manufacture.

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