Reluctance Force Print Actuator
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
A print actuator comprises an impact element 10 consisting of plural ferromagnetic elements 11 and an impact insert 12 encapsulated in a light weight bar 13 of non-magnetic material. Flexure links 14 and 15 support impact element 10 between upper and lower magnetic stators 16 and 17. As seen in the figure, upper stator 16 is an E-shaped electromagnet consisting of magnetic core 18 and winding 19 on center leg 20. The electromagnet is positioned opposite flexure links 14 and 15 because the greater flux in the gap closest to the electromagnet maintains tensile stresses in the flexure links to better control the magnet gaps. Lower stator 17 consists of magnetic core 21 with pole teeth 22 facing and aligned with pole teeth 23 of core 18 so as to form a plurality of magnetic operating gaps along the length of impact element 10.