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Described herein is a print wire actuator tester which permits analysis of the basic actuator parameters, such as impact force, flight time, cycle time and coil current.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
76% of the total text.
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Print Wire Actuator Tester
Described herein is a print wire actuator tester which permits analysis of the
basic actuator parameters, such as impact force, flight time, cycle time and coil
Referring to Fig. 1, the print wire actuator 10 is clamped into the test fixture 12. The stroke for which the actuator 10 is to be tested is set by the handwheel
14 and dial 16. When a current pulse is applied to the coil 18, the armature 20
and attached print wire 22 move to the right and impact the anvil 23 and flight
time transducer 24, producing a signal of the impact force and the flight time.
When the armature 20 returns to its initial position, an impact is transmitted to the
cycle time transducer 26 giving the cycle time. The motion detector 28 converts
the motion of the print wire tip into an electrical signal.
By appropriately connecting the signals through an oscilloscope, the above-
noted five parameters can be recorded and, by further using a graphics terminal,
the parameters can be printed out together with a graph representing the
actuator performance. It should be noted that the magnitude and shape of the
coil current pulse may be sensed by a current probe, not shown in Fig. 1.
During the design and manufacturing of print wire actuator 10, it is
advantageous to know the motion of wire 22. To do this, a non-contacting
detector scheme must be used in order not to alter the motion of the lightweight
armature 20 and wire 22. An optical device, shown in Fig....