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Soft Conductive Impact Bar

IP.com Disclosure Number: IPCOM000042944D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Emerick, AW: AUTHOR

Abstract

Hammer flight time for printers is measured when the hammer strikes a steel bar which closes an electrical circuit. A soft (urethane) impact bar with steel contacts provides electrical continuity at the time of impact while reducing hammer shock and breakage. The bar (Fig. 1) consists of a pair of hardened stainless steel combs 2 formed by a photo-chemical etch method. They are accurately positioned so they form an angle 7 between them and are then potted in urethane 4. The top surface 5 is ground to expose the tips of the combs 3. One comb becomes the positive and one the negative of the circuit (Fig. 2). The hammer provides the electrical patch when the hammer face area 6 hits the surface.

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Soft Conductive Impact Bar

Hammer flight time for printers is measured when the hammer strikes a steel bar which closes an electrical circuit. A soft (urethane) impact bar with steel contacts provides electrical continuity at the time of impact while reducing hammer shock and breakage. The bar (Fig. 1) consists of a pair of hardened stainless steel combs 2 formed by a photo-chemical etch method. They are accurately positioned so they form an angle 7 between them and are then potted in urethane 4. The top surface 5 is ground to expose the tips of the combs 3. One comb becomes the positive and one the negative of the circuit (Fig. 2). The hammer provides the electrical patch when the hammer face area 6 hits the surface.

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