Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15
Skeleton bobbins for magnetic windings afford more efficient use of limited space while still permitting required clearance and heat transfer. In Fig. 1, a molded skeleton bobbin 1, on which a magnetic winding (not shown) is wound, is supported on the lower portion 2 of a fixed stator 3. This assembly is later combined with a pivotally mounted print hammer. The bobbin is an integral unit preferably molded of a dimensionally and thermally stable polymer, but may be die cast of aluminum. It has base 4 in which control pins 5 are embedded, end retaining flanges 6 and 7, and winding rails 8 on which the coil is wound. Positional stability on stator portion 2 is obtained by the formation of guidance slot 9 to fit along the bottom of stator portion 2 and slots 10 to engage the bottom of the upper portion of stator 3.