Browse Prior Art Database

Uniform Pressure Printer

IP.com Disclosure Number: IPCOM000097988D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Scott, GL: AUTHOR

Abstract

A plurality of type slugs 10 is slidably mounted in grooves in front and rear guide plates 11 and 12 of a movable type carrier 13. Coil springs 14, compressed by slugs 10 and front guide plate 12, bias slugs 10 to retracted position.

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Uniform Pressure Printer

A plurality of type slugs 10 is slidably mounted in grooves in front and rear guide plates 11 and 12 of a movable type carrier 13. Coil springs 14, compressed by slugs 10 and front guide plate 12, bias slugs 10 to retracted position.

Print hammers 15, arranged in a row parallel to the path of travel of the type slugs, operate when magnets 16 are energized to drive slugs 10 forward against ribbon 17, print medium 18 and platen 19. Springs 20 bias the hammers 15 to retracted position, free of contact with slugs 10, when magnets 16 are de- energized. A stop bar 21 limits the stroke of hammers 15.

Each magnet 16 is designed to operate hammers 15 to deliver the same force blow, to slugs 10. However, the force with which slugs 10 strike platen 19 varies in accordance with the print surface area of the characters on the slugs. Imprint pressure is maintained uniform by matching the spring rate of springs 14 and the type font surface area. The spring rate of springs 14 is inversely proportional to the type font surface area, i.e., the greater the surface area of the type font, the lower the spring rate of coils 14.

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