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Print Disc Attachment

IP.com Disclosure Number: IPCOM000085092D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

McCray, CM: AUTHOR

Abstract

Fig. 1 illustrates a cross-sectional view of a multifingered print element disc 1 mounted on the driving shaft 2 of a motor, not shown. The motor is a stop-start stepper motor type and it is therefore required to affix the print disc 1 rigidly to the driving shaft 2; and, since hammers strike the impact surfaces of the disc fingers and the force and imprint characteristics require accurate registration of the print fingers with the media to be printed upon, it is necessary that the print disc 1 and fingers be held in registration at a precisely fixed location relative to the media. This is provided in several ways.

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Print Disc Attachment

Fig. 1 illustrates a cross-sectional view of a multifingered print element disc 1 mounted on the driving shaft 2 of a motor, not shown. The motor is a stop-start stepper motor type and it is therefore required to affix the print disc 1 rigidly to the driving shaft 2; and, since hammers strike the impact surfaces of the disc fingers and the force and imprint characteristics require accurate registration of the print fingers with the media to be printed upon, it is necessary that the print disc 1 and fingers be held in registration at a precisely fixed location relative to the media. This is provided in several ways.

Surface 3 of a fixed hub 4 which is attached to shaft 2 serves as a locating surface in abutment with the back surface 5 of disc 1. A locating pin 6 affixed to hub 4 extends through the matching aperture in disc 1, so that torsional forces between the disc 1 and the driving shaft 2 will be resisted. A molded plastic, or similar material, hub 7 abuts against the opposite face of disc 1. The hub 7 and the disc 1 are locked together by a molded snap fit resilient cam and lock surface arrangement 8, as illustrated. Several similar snap fit lock assemblies may be incorporated in the design.

Resilient rubber O-ring 9 serves the dual function of providing a horizontal component of force directed to force the disc 1 against locating surface 3 and to hold the disc and hub assembly securely on shaft 2.

In operation, the disc 1 is grasped by the hub 7 and forced on to the shaft 2 where...