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PERMANENT MAGNET LIFT ACTUATOR FOR DUAL RIBBON POSITIONING

IP.com Disclosure Number: IPCOM000024550D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 175K

Publishing Venue

Xerox Disclosure Journal

Abstract

A concept is disclosed whim provides low cost means to move CI. ribbon mounting plate in an impact printer to anyone of three lift positions in a smooth motion. With reference to Figure 1, an electromagnet 10 including three extended legs 12, 14 and 16 is positioned in operative re'1ationship to permanent magnet 18 and a high permeability return path bar 20. Coil 22 is positioned around leg 12 while coil 24 is positioned around leg 16. There is not any coil around leg 14. Positions are noted with respect to legs 12, 14 and ·16 as being positions A, Band C where permanent magnet 18 will be positioned depending upon the energizing of coils 22 and 24. Position A is obtained by energizing coils 22 and 24 such as to make leg 12 a south pole and leg 16 a north pole. Position B is obtained by energizing coils 22 and 24 such as to make both legs 12 and 16 north poles and making leg 14 a south pole. Position C is obtained by making leg 16 a south pole and leg 12 a north pole. If one would observe torque response curves (not shown), a high force is seen initially and reduces as the permanent magnet 18 approaches the desired position. This is inverse to the typical solenoid response, whim has low force at the start of travel and increases exponentially as it approaches its equilibrium position and therefore, a more useful characteristic for many applications, particularly motions resisted by springs because the highest force is generally required at the start of the motion.

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PERMANENT MAGNET LIFT ACTUATOR FOR DUAL RIBBON POSITIONING Barry C. Kockler Allan L. Saxinger

Proposed Classification U.S. Cl. ltOO/223 Int. Cl. Bltlj 33/1lt

A concept is disclosed whim provides low cost means to move CI. ribbon mounting plate in an impact printer to anyone of three lift positions in a smooth motion.

With reference to Figure 1, an electromagnet 10 including three extended legs 12, 14 and 16 is positioned in operative re'1ationship to permanent magnet 18 and a high permeability return path bar 20. Coil 22 is positioned around leg 12 while coil 24 is positioned around leg 16. There is not any coil around leg 14. Positions are noted with respect to legs 12, 14 and ·16 as being positions A, Band C where permanent magnet 18 will be positioned depending upon the energizing of coils 22 and 24. Position A is obtained by energizing coils 22 and 24 such as to make leg 12 a south pole and leg 16 a north pole. Position B is obtained by energizing coils 22 and 24 such as to make both legs 12 and 16 north poles and making leg 14 a south pole. Position C is obtained by making leg 16 a south pole and leg 12 a north pole. If one would observe torque response curves (not shown), a high force is seen initially and reduces as the permanent magnet 18 approaches the desired position. This is inverse to the typical solenoid response, whim has low force at the start of travel and increases exponentially as it approaches its equilibrium position and therefore, a more useful char...