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Impact Line Printer for All-Point Printing

IP.com Disclosure Number: IPCOM000100914D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Lee, HC: AUTHOR [+3]

Abstract

Basically, a typical impact line printer consists of a hammer bank 2, a drive system for band 3, platen 5, a carriage to increment paper 7, and a drive mechanism for ribbon 6. It might also include ribbon shield 11. The hammer unit is comprised of as many single-wide hammers as print positions. Half as many two-wide hammers as print positions can be used, in which case each hammer occupies two print positions, left and right of the hammer center. Print band 3 carries character types at a pitch slightly larger than the hammer pitch to avoid shadow printing.

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Impact Line Printer for All-Point Printing

       Basically, a typical impact line printer consists of a
hammer bank 2, a drive system for band 3, platen 5, a carriage to
increment paper 7, and a drive mechanism for ribbon 6.  It might also
include ribbon shield 11.  The hammer unit is comprised of as many
single-wide hammers as print positions.  Half as many two-wide
hammers as print positions can be used, in which case each hammer
occupies two print positions, left and right of the hammer center.
Print band 3 carries character types at a pitch slightly larger than
the hammer pitch to avoid shadow printing.

      To make all-point printing possible for a single-wide hammer
printer, the printer is provided with the capability of firing two
adjacent hammers in unison, and the character pitch on the band is
increased in a like manner as the band used in a two-wide hammer
printer.  Also provided is an interposer 8 placed between hammer unit
1 and paper 7. Whenever a character is to be printed outside the
region of hammer width, two hammers covering the print position are
fired in unison.  Fig. 2 shows two hammers imprinting a character
between hammers.  This configuration can be used for miniprinting 15
characters per inch.

      The function of the interposer is to bridge the gap between
hammers when two hammers are used.  The interposer can be in the form
of elastomer sheets or metallic combs 10 with slits 9 (Fig. 3).  A
polyimide sheet of 5-mil thickn...