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Browse Prior Art Database

Check Spring Compression in a Daisy Wheel Cartridge

IP.com Disclosure Number: IPCOM000035009D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Ashcraft, G: AUTHOR [+5]

Abstract

This article describes a mechanism to verify that only one flat parabolic shaped spring is present in a daisy wheel. The check mechanism disclosed herein will verify that only one spring is present in the daisy print wheel enclosed cartridge. Without this mechanism, it would be impossible to check for this function because the cartridge is fully assembled and this spring is not visible. (Image Omitted) With one spring present, it will put the proper tension on the print wheel when in operation in a typewriter. In the spring-loading station, two springs may be loaded into the print wheel cartridge without detection. This is caused by a malfunction of the spring-feeding and -loading device. If this occurs, extra compression is added to print wheel when it is engaged to the typewriter drive motor.

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Check Spring Compression in a Daisy Wheel Cartridge

This article describes a mechanism to verify that only one flat parabolic shaped spring is present in a daisy wheel. The check mechanism disclosed herein will verify that only one spring is present in the daisy print wheel enclosed cartridge. Without this mechanism, it would be impossible to check for this function because the cartridge is fully assembled and this spring is not visible.

(Image Omitted)

With one spring present, it will put the proper tension on the print wheel when in operation in a typewriter. In the spring-loading station, two springs may be loaded into the print wheel cartridge without detection. This is caused by a malfunction of the spring-feeding and -loading device. If this occurs, extra compression is added to print wheel when it is engaged to the typewriter drive motor. This is unacceptable and, therefore, the cartridge must be rejected and avoid being loaded into the print wheel carton. This mechanism is a stand-alone unit mounted to the automatic daisy print wheel cartridge assembly machine. It consists of the following:

(Image Omitted)

A. Support stand

B. Actuating cylinder

C. Electrical force gage equipped with load cell

D. Controller

E. Precision solid dovetail slide that houses the

force gage

F. Sense plunger Fig. 1 is a front view, Fig. 2 a side view and Fig. 3 a top view of the mechanism of this disclosure. In operation, the assembly machine fixture which nests the cartridge is a...