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Browse Prior Art Database

Linear Rotary Actuator and Transducer for Stick Printer

IP.com Disclosure Number: IPCOM000079539D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR

Abstract

The reference numeral 10 designates a linear stepper actuator and the numeral 12 a rotary stepper actuator, for providing the necessary linear and angular motion for a stick printer.

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Linear Rotary Actuator and Transducer for Stick Printer

The reference numeral 10 designates a linear stepper actuator and the numeral 12 a rotary stepper actuator, for providing the necessary linear and angular motion for a stick printer.

The linear actuator 10 has a cylindrical permanent-magnet armature 14 on a shaft 16, the armature being provided with a plurality of spaced rings 18 which cooperate with rings 20 on stator poles 22 having axially displaced windings, which may be selectively energized to move the shaft axially. The rotary stepper actuator or motor 12 on the same shaft has a cylindrical permanent magnet rotor 24 having axial ribs or teeth 26, which cooperate with teeth 28 on stator poles 30 to provide rotary stepping action of the shaft 16. The stator poles are axially long enough to maintain the rotors in the stator fields throughout their axial movement

A transducer 32 is provided for cooperating with a projection 34 on the shaft 16 for detecting the "home" position for both linear and angular motion. The respective axial and angular positions may be tracked from this position by electronic means. If the "home" character is placed on the top ring of characters on the stick, the rotor will be in its lowest position when the home position is detected. Hence, all that is required at the start is to rotate the motor slowly. Gravity will promptly bring it to the lowest position and then the transducer detects and causes it to stop in the home positio...