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Browse Prior Art Database

Shift Scheme for a Daisy Wheel Printer

IP.com Disclosure Number: IPCOM000050862D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Quinn, PA: AUTHOR

Abstract

To use a stepper motor to position a print wheel where the number of steps accessible on the stepper motor is half of the necessary print wheel positions, the stepper motor 10 may be mounted such that it may be partially rotated by an amount of rotation equal to half of the angular step of the stepper motor. For example, if a print wheel has 96 print positions around its periphery and a stepper motor of 45 steps is utilized, by rotating the motor housing and thus the motor shaft 3.75 degrees, alternate characters may be selected on the periphery of the print wheel. The rotation of the motor 10 may be accomplished by rotationally supporting the motor 10 and attaching a shift armature 14 to the motor.

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Shift Scheme for a Daisy Wheel Printer

To use a stepper motor to position a print wheel where the number of steps accessible on the stepper motor is half of the necessary print wheel positions, the stepper motor 10 may be mounted such that it may be partially rotated by an amount of rotation equal to half of the angular step of the stepper motor. For example, if a print wheel has 96 print positions around its periphery and a stepper motor of 45 steps is utilized, by rotating the motor housing and thus the motor shaft 3.75 degrees, alternate characters may be selected on the periphery of the print wheel. The rotation of the motor 10 may be accomplished by rotationally supporting the motor 10 and attaching a shift armature 14 to the motor. The shift armature may be spring biased by spring 16 to hold the armature in a first position and may be attracted by solenoid 18 to an alternate position displaced by 3.75 degrees rotation.

Therefore, any actuation of the shift solenoid will effect an alternate character position selection for each of the rotational positions of the motor shaft of selection motor 10.

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