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Safety Interlock with Delay Function for Wire Dot Printer

IP.com Disclosure Number: IPCOM000110563D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 3 page(s) / 74K

Publishing Venue

IBM

Related People

Hashizume, S: AUTHOR [+2]

Abstract

Disclosed is a technique for safety interlocks with delay function so that a current print job is completed during the delay time. A current print job is defined as one line printing from the current printing position. This algorithm provides easy recovery for printing when the job needs to be continued after the condition of interlock is cancelled.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Safety Interlock with Delay Function for Wire Dot Printer

       Disclosed is a technique for safety interlocks with delay
function so that a current print job is completed during the delay
time.  A current print job is defined as one line printing from the
current printing position.  This algorithm provides easy recovery for
printing when the job needs to be continued after the condition of
interlock is cancelled.

      With fastening the safety standard and speeding up the
printing, the movement of a print head is recently regarded as
dangerous.  Wire dot printers have the upper cover which users can
open for the change of ink ribbon.  Users are in danger of touching
the print head while moving at high speed.  Thus, safety interlocks
are necessary to remove this mechanical hazard in printers.

      Stopping of printing immediately in the midst of one line makes
recovery difficult.  Also when a user opens the cover in the midst of
one line, the user cannot touch the moving print head if printing to
the end of line is continued because the high speed printer prints
one line so fast.  Thus, interlocks need not work immediately.  The
delay method is designed to maintain the software performance.

      The delay time must satisfy the following requirements:
      (1) A current print job must be completed before activating the
safety interlock mechanism.
      (2) Safety interlocks work before users can touch dangerous
parts - the moving pr...