Browse Prior Art Database

Prioritized Timeout Multiplexer Control

IP.com Disclosure Number: IPCOM000047031D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Carrington, JE: AUTHOR [+2]

Abstract

A prioritized timeout multiplexer portion of a print control unit design for a high speed printer uses a single counter for timing out the operations of several functions of the print mechanism. The control includes logic for giving priority to the hammer check timeout operation in the event a hammer misfire error occurs during printing. As seen in Figs. 1 and 2, a multiplexed counter 10 operates to time out the print rate and keep it below a predetermined limit, a pseudo carriage print operation used in print and space suppress operations gives priority to a hammer check timeout operation in case of a hammer misfire during the timing out of the printing operations by counter 10.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Prioritized Timeout Multiplexer Control

A prioritized timeout multiplexer portion of a print control unit design for a high speed printer uses a single counter for timing out the operations of several functions of the print mechanism. The control includes logic for giving priority to the hammer check timeout operation in the event a hammer misfire error occurs during printing. As seen in Figs. 1 and 2, a multiplexed counter 10 operates to time out the print rate and keep it below a predetermined limit, a pseudo carriage print operation used in print and space suppress operations gives priority to a hammer check timeout operation in case of a hammer misfire during the timing out of the printing operations by counter 10. Print rate latch 11 and a 128-msec pulse signal gates high frequency clock pulses through AND circuits 12 and 13 to advance counter 10 when the print rate latch is set by Set Print Latch and Not Hammer Check Scan signals at T9 time when the hammer check latch 14 is not set. A signal generated by AND circuit 15 when counter 10 reaches count 2.3.6 resets rate latch 11, thereby raising a Not Print Rate signal on line 16 thereby gating the carriage go signal to activate paper feed controls (not shown), gating the generation of a print complete interrupt (not shown) and clearing counter 10. In the event of a printing operation not requiring the feeding of paper (print and space suppress), a pseudo carriage timeout signal is generated to facilitate hamme...