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Low inertia in a high speed printer is provided by decoupling a low inertia print wheel from a high inertia drive motor during print impact.
English (United States)
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Low Inertia Daisy Wheel Printer
Low inertia in a high speed printer is provided by decoupling a low inertia
print wheel from a high inertia drive motor during print impact.
In known daisy wheel printers, a print wheel spins to a selected character,
stops for impact printing, and then spins again. The speed the wheel reaches
between characters, and hence the maximum print speed, is related to the inertia
of the drive motor and associated angular encoding system.
As shown in the drawing, a low inertia print wheel carries peripheral
characters which when impacted print via a ribbon on paper backed by a platen.
The drive motor is connected to the print wheel by a coupling which allows the
print wheel to stop for printing while the print motor continues to rotate.
Immediately after printing, the wheel and drive motor recouple. Thus, the print
speed is virtually independent of the inertia of the drive motor which may be high.
A magnetic actuator is shown having two movable arms, one of which
operates a print hammer and the other stops the wheel by contact for printing.
An optical encoder associated with the wheel may either be an integral part of
the wheel or an attached encoding disk.
The coupling may be a magnetic linkage, a flexible coupling wound up during
printing and then aiding acceleration of the wheel after printing, or a miniature
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