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Method for Making a Multiple Hammer Element

IP.com Disclosure Number: IPCOM000048932D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Hanna, DW: AUTHOR [+4]

Abstract

This article describes a one piece multiple position printer hammer element and its method manufacture. Each hammer element comprises a cantilever beam spring element in which the print energy is stored and an impactor blade which strikes or pushes a dot print element into inked ribbon and paper, thereby printing dots. The impactor blade may be more than one character wide and can print dots in any of several locations within a given character as a print element moves relative to the hammer element. In the specific structure illustrated, the print hammer element includes nine hammers, each three characters wide.

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Method for Making a Multiple Hammer Element

This article describes a one piece multiple position printer hammer element and its method manufacture. Each hammer element comprises a cantilever beam spring element in which the print energy is stored and an impactor blade which strikes or pushes a dot print element into inked ribbon and paper, thereby printing dots. The impactor blade may be more than one character wide and can print dots in any of several locations within a given character as a print element moves relative to the hammer element. In the specific structure illustrated, the print hammer element includes nine hammers, each three characters wide.

Fig. 1 shows how the basic shape of a single hammer element 10 is formed from the paddle-shaped end of a sheet metal beam 11. A U-shaped slot 12 is formed by shearing, etching, cutting or using EDM techniques. The material 13 outside the cut 12 is then bent over to form a projecting horizontal impactor blade 14 generally at a right angle to beam 11. The remaining tab 15 projecting vertically above impactor blade 14 provides good dynamic characteristics for the hammer. Tab 15 brings the center of percussion of the hammer near the line of action of the impactor 14, thereby preventing double striking.

Figs. 2 through 5 show various shapes for bent material 13 to control the distance the impactor blade extends from beam 11.

Fig. 6 shows a sequence of steps for manufacturing the multiple hammer element from a continuous sheet 20 of base metal. The...