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A moving coil actuator enables a print head to be moved to a varying operating position while held with a constant force.
English (United States)
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Moving Coil Print Head Actuator
A moving coil actuator enables a print head to be moved to a varying
operating position while held with a constant force.
Referring to Figs. 1 and 2, print head carrier 1 with printing elements 2 is
moved counterclockwise about pivot 3 by energizing coil 4 within the flux field of
permanent magnets 5. Print elements 2 are to be held against paper 6 on platen
7 by a constant force; however, component and assembly tolerances, and wear
cause the amount of rotation required of carrier 1 to vary. Lift-off of elements 2
occurs with current reversal in the coil, or by gravity if current terminates.
A constant force between print elements and paper over a range of carrier
travel is attained by maintaining a magnetic field of uniform flux density during
coil energization. Therefore, the pole face dimension of magnets 5 is greater in
the direction of coil travel than the corresponding dimension of the adjacent coil
faces. A constant current drive source is used to control the print element force.
The impact force of the print elements on the paper during engagement can
be controlled by applying a reverse coil current TR momentarily during the
forward motion of the carrier (Fig. 3). Varying reverse current timing, magnitude
and duration permit accurate force control.
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