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An indicator signals an operator to add toner to a copier when the tone remains below a desired limit for a first period and stops the copier if the toner has not been added after an additional period.
English (United States)
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Toner Replenishment Indicator
An indicator signals an operator to add toner to a copier when the tone
remains below a desired limit for a first period and stops the copier if the toner
has not been added after an additional period.
If an operator prematurely attempts to add toner to a copier's reservoir
because the "add toner" indicator erroneously occurs, toner may spill inside the
copier. One case of incorrect premature toner low indication is an uneven level
of toner across the entire reservoir. Another is misadjusted toner low sensing
Regardless of how a toner low condition is sensed, i.e., photocell, switch,
etc., it is desirable to delay the occurrence of an "add toner" indication to avoid
spilling. For example, in the figure, a paddle rests on an arm mounted on a shaft
which rotates 360 Degrees each time toner is fed. As the toner level decreases,
the paddle drops and momentarily comes to rest on top of the toner until it is
returned to its static position by the shaft. The paddle follows the toner level in
this manner and eventually begins to operate a toner low sensing switch. A
counter (preset to n) is incremented by 1 each time the switch closes during a
toner feed operation. Activation of an "add toner" indicator is delayed until the
counter reaches n/2, thereby allowing toner to become depleted to a level that no
longer poses a spillage problem when the empty cartridge is removed. The
switch does not close during subsequent toner feeds foll...