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Electronic Control Of Print Impact In Single Element Typewriters Disclosure Number: IPCOM000066524D
Original Publication Date: 1979-Mar-01
Included in the Prior Art Database: 2005-Feb-20

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Schaefer, JO [+details]


In single-element typewriters, print impact is a function of a fixed mass element impacting at one of several selectable print velocities. Because of variations in machine loading, a given selected velocity may vary as much as y 15 percent. In the best machines, a maximum of three selectable velocities are available, these representing the minimum number of velocities that may be employed to provide high quality print over the wide range of character sizes used. However, at best the system is a compromise with many characters striking too hard, while others have too little impact force. Ideally, a specific impact velocity should be assigned to each character in the font. In this manner, side printing and noise would be reduced while print quality would be optimized.