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Duplex Printing With One Hammer Unit

IP.com Disclosure Number: IPCOM000100029D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Jensen, DF: AUTHOR [+3]

Abstract

This article describes a technique for printing on both sides of a sheet (duplex printing) on an impact printer. Furthermore, duplex printing is accomplished with one hammer unit in a printer configuration that maximizes throughput.

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This is the abbreviated version, containing approximately 52% of the total text.

Duplex Printing With One Hammer Unit

       This article describes a technique for printing on both
sides of a sheet (duplex printing) on an impact printer. Furthermore,
duplex printing is accomplished with one hammer unit in a printer
configuration that maximizes throughput.

      In a high speed line printer, printing is typically
accomplished when a print hammer 6 impacts the print medium 7 and
ribbon 4, (Fig.  3), pushing them against a high speed, moving print
band 1 (Fig. 1).  The hammer impact takes place at the precise time
that the desired character to be printed is in line with the hammer.
This describes the printing operation for a back printer.  In this
mode, the char acters 2 on the print band 1 appear as reversed image
characters on the print band.

      In order to accomplish duplex printing on a printer with a
strip ribbon, as in Fig. 2, a strip ribbon 8b is moved vertically
into the print line position 11, and ribbon 8a is moved down out of
the print line and below the hammer faces 10.  The print band 1 is
moved vertically such that the reversed character row 2 is in front
of hammer faces 10. The print band is shown in Fig. 1.  The entire
front of the sheet is printed one line at a time, from top to bottom.
 At the completion of the bottom row of printing, the paper medium or
sheet is moved in a high speed manner such that the top of this sheet
is again in front of the print line 11.  It is preferable that this
is done one-half of a line pitch below the top line of the front side
of the sheet, although thi...