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Signal Ringing Reduction Device for PVF-2 Platen

IP.com Disclosure Number: IPCOM000041128D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Lee, SY: AUTHOR [+2]

Abstract

A printing platen is described in which an impact sensitive polymeric material is used to reduce signal ringing so that hammer flight time and impact force can be accurately sensed. (Image Omitted)

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This is the abbreviated version, containing approximately 100% of the total text.

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Signal Ringing Reduction Device for PVF-2 Platen

A printing platen is described in which an impact sensitive polymeric material is used to reduce signal ringing so that hammer flight time and impact force can be accurately sensed.

(Image Omitted)

The platen 1 includes two elongated sensing strips 2, 3 which are spaced apart on the platen 1. Each of the sensing strips comprises a conductive layer 4, a strip of impact sensitive polymeric material 5 such as polyvinylidene fluoride (PVF2), for example, a second conductive layer 6 and an impact strip 7.

The PVF2 material has piezo-electric properties so that a voltage Va is produced across the conductive strips 4, 6 when a print hammer 8 impacts the platen 1. The impact force is applied to strip 2 but not to strip 3 so that the PVF2 material 5 in strip 2 is under compression while the PVF2 material 5 for strip 3 is not under compression. After the impact force is removed, both strips 2 and 3 sense the same reaction force caused by the platen structure vibration.

The control circuit has the two strips connected opposite to each other, so that the resultant signal, at output terminals 9, will be cancelled, except those during the time when the hammer 8 contacts the platen 1.

Disclosed anonymously.

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