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Self Contained Platen Motor

IP.com Disclosure Number: IPCOM000048647D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Anderson, TW: AUTHOR

Abstract

The motor and platen assembly in various printers is a relatively space consuming portion of the device. A condensed overall printer can advantageously incorporate a combined motor and platen as indicated in the figure.

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Self Contained Platen Motor

The motor and platen assembly in various printers is a relatively space consuming portion of the device. A condensed overall printer can advantageously incorporate a combined motor and platen as indicated in the figure.

In the figure, the horizontal cross-section of a schematic of the combined motor and platen assembly is shown. A framework 1 supports a hollow shaft 2 on which are mounted roller bearing sets 3 press fitted into the case or housing of a motor 4 having a rotor with pole pieces 5, which may be permanent magnets. Stator windings 6 supplied with power over suitable leads 7 are shown. The stator windings 6 can be affixed to an internal framework mounted rigidly on the hollow tube 2 since the stator windings and tube 2 do not move.

An outer covering 8 on the cylindrical body of the case 4 for the motor forms a platen surface.

In operation, the motor may be operated as a stepper motor with appropriate current pulses supplied over the leads 7 to the stator windings 6. This will cause the case of motor 4 to rotate on bearings 3 due to interaction between the pole pieces 5 and the stator windings 6. Thus, the drawing illustrates what is effectively an inside-out motor, with the outer casing of the motor rotating while the normal armature or inner portions are held fixed. This provides a motor- driven platen within the space normally occupied by the platen alone.

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