Printing – Selective or progressive – Bed and platen machines
Patent
1977-12-22
1980-08-19
Coven, Edward M.
Printing
Selective or progressive
Bed and platen machines
400124, B41J 770
Patent
active
042178207
ABSTRACT:
In an apparatus for printing characters on film mounts or slides, a computer-controlled needle printer is provided for printing on the slides as they are moved continuously past the printer. Elastic guide members guide the slides past the printer without interference. The needles of the needle printer are individually triggered in accordance with character data keyboard entered into a programmable memory. A read-only memory contains character data that are transferred to the programmable memory in response to operation of the keyboard. An intermediate memory is included at the keyboard to invert the character data (first in-last out) when the slides are turned around and reentered into the printer for printing characters on the reverse side of the slides. The intermediate memory is responsive to a limit switch that sense the presence of a slot formed in one side of each slide. The intermediate memory is activated only when a slot in the side of a moving slide is detected indicating that the slide is reversed and inversion of the character data is called for. The apparatus may be programmed to store a large number of identification data to be printed on the slides successively or in some arbitrary, predetermined order. A display console including a cathode ray tube is provided to display the data to be printed on the slides so that the data can be edited before actual printing.
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