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OPTIMUM HAMMER TIMING

IP.com Disclosure Number: IPCOM000023890D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 399K

Publishing Venue

Xerox Disclosure Journal

Abstract

A concept is disclosed regarding means for decreasing the length of the delay between a print-hammercycle and the start of print wheel motion for the next print cycle. The standard practice is to use one delay time set to encompass the worst case delay time of the print-hammercycle time for the lowest hammer energy level of the various energy levels used during printing.

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XEROX DISCLOSURE JOURNAL

OPTIMUM HAMMER TIMING ProposedDavid R. Deetz Classification

U.S. CL lO1/93C

mt. CL B41j

20T~ME I

22 2/'~0 23

PIG. 3

A concept is disclosed regarding means for decreasing the length of the delay between a print~hammercycle and the start of print wheel motion for the next print cycle.

The standard practice is to use one delay time set to encompass the worst case delay time of the print~hammercycle time for the lowest hammer energy level of the various energy levels used during printing.

The present concept discloses the provision of means for detecting when the print hammer ceases to contact the print element during the return or rebound of the print hammer after the printing of the character occurs. This detection can be used to shorten the delay time between print cycles and will improve the speed of printing.

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Volume 4 Number 2 March/April 1979 155

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OPTIMUM HAMMER TIMING (ConVd)

With reference to Figure 1, various excursions of the print hammer are plotted with position versus time, Plot 10 depicts the print hammer excursion for the highest energy level used for printing with plot 13 depicting that for the lowest energy level. Plots 11 and 12 depict various intermediate energy levels used during printing~ Line 14 depicts the point at which the print hammer separates from contact with the print element on the return or rebound strokes

Figure 2 depicts the period of delay between the times for energizing the print element drive and the hammer drive for the printing of succeeding characters according to the standard practice. Start time 18 depicts th...