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An ink ribbon testing device is employed to measure the forces required to remove measured portions of ink from an ink ribbon.
English (United States)
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Ink Ribbon Testing Device
An ink ribbon testing device is employed to measure the forces required to
remove measured portions of ink from an ink ribbon.
Ink ribbon 11 is mounted adjacent shutter window 13 and is exposed to
abrasive particles, such as silica sand, hurled from spinning wheel 15 when
shutter 17 is in the position depicted. Sand 19 loaded in hopper 21 flows with a
constant flow rate onto the spinning wheel 15. Spinning wheel 15 has radial veins
23 extending thereabout and is rotated at a constant velocity by motor 25. Since
wheel speed and sand flow rate are constant, the abrasive force applied to the
ink surface of ribbon 11 is controlled by the exposure time as effected by shutter 17. The ink removed by abrasion is measured by an optical scanning device,
such as an image analyzer, and correlated with the abrasive force required to
effect such ink removal.
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