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Multi-Function Impact Detector for Impact Printers

IP.com Disclosure Number: IPCOM000044141D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hindermeyer, E: AUTHOR

Abstract

When a print hammer 1 impacts record carrier 2, the latter is forced against ribbon 3, while print band 4 (made, for example, of steel) is forced against tongue 5 of a comblike platen (Figs. 1 and 2). Thus, tongue 5 is subject to elastic deformation which is transformed by an attached strain gauge 6 into an electrical signal SG. The magnitude of SG, which is proportional to the elastic deformation of the tongue, indicates the impact force. To minimize inaccuracies when the hammer obliquely impacts the record carrier, the value R of the tongue impact area must be kept to a minimum. The time elapsing between the time at which the firing of the print hammer starts and signal SG occurs is the hammer flight time.

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Multi-Function Impact Detector for Impact Printers

When a print hammer 1 impacts record carrier 2, the latter is forced against ribbon 3, while print band 4 (made, for example, of steel) is forced against tongue 5 of a comblike platen (Figs. 1 and 2). Thus, tongue 5 is subject to elastic deformation which is transformed by an attached strain gauge 6 into an electrical signal SG. The magnitude of SG, which is proportional to the elastic deformation of the tongue, indicates the impact force. To minimize inaccuracies when the hammer obliquely impacts the record carrier, the value R of the tongue impact area must be kept to a minimum. The time elapsing between the time at which the firing of the print hammer starts and signal SG occurs is the hammer flight time. Multi-ply paper has better attenuation characteristics than normal paper, and the influence it exerts on the magnitude and the time curve of SG can be empirically determined. As a result, the paper thickness can be automatically measured. The tongue's susceptibility to elastic deformation in the vertical plane permits monitoring any vertical registration of the type carrier or print band. The width of the tongue may be such that it may be associated with several adjacent print hammers. To prevent the various tongues used from influencing each other, a bridge circuit is provided, by means of which every other tongue is connected in parallel. The bridge circuit also serves to suppress impact measurements if two...