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This publication describes a mode of operation wherein the coil of a no-work actuator may be driven so as to excite the natural frequency of impact between the spring-loaded armature and the paper.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
61% of the total text.
Page 1 of 2
Resonant Impact Printing
This publication describes a mode of operation wherein the coil of a no-work
actuator may be driven so as to excite the natural frequency of impact between
the spring-loaded armature and the paper.
This technique drastically reduces the effective cycle time of no-work actuators,
and simultaneously alleviates wear problems, without any alteration in
mechanical design. Resonant operation of a no-work actuator consists of driving
the buck-out coil of the actuator to excite the natural frequency of impact
between the spring-loaded armature and the paper. When properly
implemented, such excitation can achieve a rapid burst of impacts having
uniform strength, without the usual necessity of resealing the armature against
the pole-face after each impact. This greatly reduces the effective cycle time of
the actuator. As a side benefit, the number of collisions between the armature
and the pole-face is significantly decreased, thereby reducing wear. The
structure of a commercial actuator (i.e., described in U.S. Patent 4,136,978)
which can be used for resonant operation is shown in Fig. 1. When the buck-out
coil 10 is off, the armature 12 is held against the pole-face 14 by the coil's
permanent magnet, thereby storing energy in the flexures. When coil 10 is
pulsed, the magnet releases, allowing the armature 12 and wire to fly toward the
paper 16 against the platen 18. Fig. 2 illustrates the voltage input waveform to
coil 10 for implementing resonan...