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Rotary Adjustment Mechanism for a Selection Step Motor

IP.com Disclosure Number: IPCOM000043529D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Okcuoglu, SA: AUTHOR [+2]

Abstract

A step motor 1 is mounted within a motor mount 2, which is supported on a carriage in a fixed position. The motor 1 has a print wheel 3 mounted on its shaft 4 so as to position a character on one of the elements of the print wheel 3 for engaging a platen when a print hammer 5, which is mounted on the upper end of the motor mount 2, is energized. An adjustment bracket 6 is attached to the motor 1 by a screw 7. The motor mount 2 has an arcuate hole 8 to enable a locking screw 9 to extend therethrough into a hole in the adjustment bracket 6. When the locking screw 9 is tightened, the adjustment bracket 6 is locked in place on the motor mount 2 to lock the motor 1 against rotation relative to the motor mount 2.

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Rotary Adjustment Mechanism for a Selection Step Motor

A step motor 1 is mounted within a motor mount 2, which is supported on a carriage in a fixed position. The motor 1 has a print wheel 3 mounted on its shaft 4 so as to position a character on one of the elements of the print wheel 3 for engaging a platen when a print hammer 5, which is mounted on the upper end of the motor mount 2, is energized. An adjustment bracket 6 is attached to the motor 1 by a screw 7. The motor mount 2 has an arcuate hole 8 to enable a locking screw 9 to extend therethrough into a hole in the adjustment bracket 6. When the locking screw 9 is tightened, the adjustment bracket 6 is locked in place on the motor mount 2 to lock the motor 1 against rotation relative to the motor mount 2. When the locking screw 9 is released, the adjustment bracket 6 is rotatable within the limits of the arcuate hole 8 to allow rotation of the motor 1 relative to the motor mount 2. The adjustment bracket 6 has a slot 10 in its upper end to receive a rotary adjustment screw 11, which extends into a threaded hole 12 in the motor mount 2. To maintain proper alignment of the print wheel 3 when the print hammer 5 is fired, rotary adjustment of the motor 1 is necessary during the initial set up. This compensates for part tolerances and hysteresis of the motor 1. To adjust the position of the motor 1 within the motor mount 2, the locking screw 9 is loosened. Rotation of the rotary adjustment screw 11 away from the...