Browse Prior Art Database

Print Hammer Actuator

IP.com Disclosure Number: IPCOM000101356D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 72K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

The described actuator is suitable for energizing high performance print hammers such as those which produce fully formed characters on engraved band printers.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Print Hammer Actuator

       The described actuator is suitable for energizing high
performance print hammers such as those which produce fully formed
characters on engraved band printers.

      This actuator uses an armature which has only a fraction of the
mass of conventionally designed armatures and is incorporated within
a compact design featuring high operating efficiency and low-cost
sheet- metal fabrication.

      The figures illustrate this actuator which is suitable for use
with print hammers having a pushrod to transfer energy from the
magnetic actuator to the print hammer.

      The actuator shown in Figs. 1 and 2 develops its force and
energy by the energization of a single coil 14 which is wound around
a pair of stator poles 11 comprising an "E" core structure.  This "E"
core is formed by combining two "C"-shaped sheet-metal cores 24, 25,
which form the stator poles 11, shown both in Figs. 2 and 4,
providing a relatively short magnetic flux path which passes through
sheet-metal armature 12.  Magnetic flux moves in the direction of the
arrows, as shown in Fig. 2, through the center leg of the "E" core,
around the outer legs, across the outer magnetic air gap, through the
armature and finally across the central magnetic air gap to the
central leg of the "E" core.

      Armature 12 is energized from its rest position (against bumper
16 to its actuated position (against stator pole 11).

      The armature tip 13 acts to propel both...