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Snap on Coupling Between Daisy Print Wheel and Drive Shaft

IP.com Disclosure Number: IPCOM000051902D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Feinstein, P: AUTHOR

Abstract

Daisy wheel printers employ traditional daisy wheels, as shown in the figure, wherein fingers 10 extending from central hub portion 11 contain the characters 12 to be printed. In mounting these print wheels on the drive shaft, it is desirable to obtain automatic coupling with the shaft without the need for any manual intervention by the operator. Present print wheel structure provides for such a simple coupling. This coupling eliminates any misregistration which might occur between the daisy print wheel and impact printer hammers due to a floppy coupling between the print wheel and the drive shaft.

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Snap on Coupling Between Daisy Print Wheel and Drive Shaft

Daisy wheel printers employ traditional daisy wheels, as shown in the figure, wherein fingers 10 extending from central hub portion 11 contain the characters 12 to be printed. In mounting these print wheels on the drive shaft, it is desirable to obtain automatic coupling with the shaft without the need for any manual intervention by the operator. Present print wheel structure provides for such a simple coupling. This coupling eliminates any misregistration which might occur between the daisy print wheel and impact printer hammers due to a floppy coupling between the print wheel and the drive shaft.

The coupling consists of three elastic tabs 13 which grip the selection motor shaft due to a controlled interference fit. These tabs eliminate misregistration due to clearance required previously and result in acoustic benefits due to elimination of slop between the wheel and the selection motor shaft. The elastic action of the three tabs also limits the force required to seat the wheel against the mounting hub on the three mounting pads 14. This insures reliable loading of the print wheel into the printer. Three back-up pads 15 are also provided to prevent loss of concentricity due to action of the elastic tabs. The back-up pads are a tight slip fit on the selection motor shaft.

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