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Plastic-Backed Contact Strip for Flight-Time Determination in Impact Printers

IP.com Disclosure Number: IPCOM000047686D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Bruegmann, W: AUTHOR [+4]

Abstract

For determining the flight time of a print hammer 3, a contact strip 2 is placed on platen 4. When print hammer 3 hits contact strip 2, at least two line bars 5 of the contact strip are bridged by print hammer 3 for a signal flow. As the occurrence of this signal flow and the firing time of the print hammer are interrelated, the flight time is determined by these two factors. To compensate for the absence of a ribbon or record carrier (steel band in the case of steel band printers), contact strip 2 is backed with a deformable plastic strip 1. To prevent hammer breakdown at high impact speeds, plastic strip 1 has an E-shaped cross-section.

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Plastic-Backed Contact Strip for Flight-Time Determination in Impact Printers

For determining the flight time of a print hammer 3, a contact strip 2 is placed on platen 4. When print hammer 3 hits contact strip 2, at least two line bars 5 of the contact strip are bridged by print hammer 3 for a signal flow. As the occurrence of this signal flow and the firing time of the print hammer are interrelated, the flight time is determined by these two factors. To compensate for the absence of a ribbon or record carrier (steel band in the case of steel band printers), contact strip 2 is backed with a deformable plastic strip 1. To prevent hammer breakdown at high impact speeds, plastic strip 1 has an E-shaped cross-section. The outer sections 1-1 and 1-3 of the E are used for positioning, whereas the center section 1-2 is deformed upon being impacted by the hammer, thus expanding into the interstices of the E, viewed in the direction of the arrow.

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