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Alphanumeric or Braille characters are imprinted serially on a continuous form by a pendulum-supported, continuously rotating print wheel.
English (United States)
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Serial Printing Or Embossing Device
Alphanumeric or Braille characters are imprinted serially on a continuous
form by a pendulum-supported, continuously rotating print wheel.
Print wheel 1 (Fig. 1) is carried by a pendulum-type arm 2 that is supported
within bearings on a carrier (not shown) slidably mounted on a drive shaft 3.
Wheel 1 is biased by spring 4 into lateral contact with cam 5. Shaft 3, through
hubs 6, 7 and a belt 8, continuously rotates wheel 1. A timing mark T on wheel
1 is sensed by a photosensor (not shown) to generate timing signals to insure
synchronization and assure that cam 5 will be rotated one cycle clockwise at the
appropriate time by suitable means (not shown) to print the particular character
selected. Arm 2 is rocked counterclockwise by cam 5 about shaft 3 to swing
wheel 1 into contact with a paper sheet 9 and drive the latter against a suitable
platen or die 10. Sheet 9 is incremented a line at a time upward, as viewed in
Fig. 1, as printing of each line is completed.
Note that arm 2, which is slidably mounted on shaft 3, is recessed at 11 to
provide an edge 2a (see top plan view, Fig. 2) that engages one of the teeth on
an escapement rack 12 that is adjacent the arm. Arm 2 is spring-biased by a
negator spring 13 or the like so as to increment one tooth rightward, as viewed in
Fig. 2, each time cam 5 operatively drives the print wheel 1 into contact with
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