Browse Prior Art Database

Energy Compensation for Dot Printers

IP.com Disclosure Number: IPCOM000050816D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR [+2]

Abstract

Impact energy-absorbing pads are fixed to the anvils of dot-forming elements. The pads have a thickness inversely proportional to the dot size of the dot-forming elements.

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Energy Compensation for Dot Printers

Impact energy-absorbing pads are fixed to the anvils of dot-forming elements. The pads have a thickness inversely proportional to the dot size of the dot-forming elements.

In Fig. 1, a dot-forming mechanism 10 for a dot printer comprises carrier portion 11 having flexible deflection members 12 with anvils 13 facing hammer blades 14 and dot elements 15 facing ink ribbon 16. During linear motion of the mechanism 10, blades 14 impact anvils 13 flexing the deflection members 12 to drive the dot elements 15 into ribbon 16 against a single or multiple layer form 17 backed by platen 18. The dot elements 15 may be of various sizes dependent on the type of printing desired. For that purpose, dot mechanism 10, which may be a bar or flexible band, is made to be interchangeable within the printer. Because blades 14 are operated at a fixed-impact energy level, sufficient for the largest dot size and the greatest number of parts form 17, damage to the ribbon 16 or form 17 is possible with the smallest dot element and/or single part forms.

Anvils 13 are constructed with an energy-absorbing layer whose properties vary as a function of the size of the dot elements 15.

Fig. 2 shows the anvils 13 with an energy-absorbing layer 19 molded onto the end facing the blades 14. In Fig. 3, the energy-absorbing layer is a cap 20 bonded to the metal base portion 21 of anvil 13.

In either case, layer 19 or cap 21 can be made of urethane whose thickness is...