High efficiency coil posts for print hammer actuators

Details High efficiency coil posts for print hammer actuators High efficiency coil posts for print hammer actuators

1987-08-31

1989-05-30

Sewell, Paul T.

Printing

Selective or progressive

Bed and platen machines

101 9348, 400121, 4001572, B41J 310

Patent

active

048339806

ABSTRACT:
Stored energy print hammer actuators (11) having high efficiency coil posts (19) are disclosed. The coil posts (19) include a cylindrical core (33) mounted on a pin (35). The cylindrical core (33) has high resistivity and, thus, minimizes eddy currents and the power losses created by eddy currents. The cylindrical core (33) also has low hysteresis loss. In one form, the core (33) is formed of layers of a high resistivity material shaped to prevent eddy currents from circulating about the circumference of the posts. Suitable shapes include discrete C-layers and continuous spiral layers. Preferably, the layers are coated with an electrical insulating material that prevents cross-lamination eddy current flow. In another form, the core is formed of a high resistivity homogenous material, such as a ferrite material or a magnetic powder and an adhesive binder.

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