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MEANS AND METHOD FOR ENHANCING RIBBON LIFT

IP.com Disclosure Number: IPCOM000023381D
Original Publication Date: 1977-Aug-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 483K

Publishing Venue

Xerox Disclosure Journal

Abstract

Apparatus is disclosed to enable an impact printer employing a daisy wheel type print element and an ink ribbon, which is raised to an up or print position from a down or character viewing position, to print without loss of portions of the printed characters because of the occurrence of incomplete ribbon lift when and if the ribbon contacts the character slug during lifting of the ribbon, By controlling the direction of print wheel rotation during ribbon lift, any contact between the ribbon and the print wheel provides enhancement of the lifting of the ribbon. After the ribbon is in the up or print position, the print wheel is allowed to rotate in a direction which provides the shortest path of rotational travel to the next character to be printed.

This text was extracted from a PDF file.
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Page 1 of 2

XEROX DISCLOSURE JOURNAL

MEANS AND METHOD FOR ENHANCING Proposed Classification
RIBBON L~FT tJ,S. Cl. 197/151
bavid.Deetz mt. Cl.B4lj 33/14

~PRINTWHEELHOMlNG.5IGNAL c402 I

PRINT WHEEL 10~ DIRECTION STROBE 0

                           D Q 4/01 / 502 - PRINTWHE RIBBON urr 507 C ~ REVERSE

TIMING SIGN

        503 504 I ABSOLUTE PRINT 406

>WHEEL ADDRESS COUNTER

4/4 AND 4/2 I

   ABSOLUTE PRINT i>~WHEELPOSITION COMPARATOR

Apparatus is disclosed to enable an impact printer employing a
daisy wheel type print element and an ink ribbon, which is
raised to an up or print position from a down or character
viewing position, to print without loss of portions of the
printed characters because of the occurrence of incomplete
ribbon lift when and if the ribbon contacts the character slug
during lifting of the ribbon, By controlling the direction of
print wheel rotation during ribbon lift, any contact between
the ribbon and the print wheel provides enhancement of the
lifting of the ribbon. After the ribbon is in the up or print
position, the print wheel is allowed to rotate in a direction
which provides the shortest path of rotational travel to the
next character to be printed.

One embodiment which provides means and methods for enhancing
ribbon lift comprises a cross-coupled latch circuit 500 in
conjunction with an OR gate 510.

Volume 2 Number 4 July/August 1977 45

[This page contains 1 picture or other non-text object]

Page 2 of 2

MEANS AND METHOD FOR ENCHANCING RIBBON LIFT (Cont'd)

When the printer is initially energized, the print wheel
homing signal on line 402 is pulsed to a low ("0") logic level
resulting in the print wheel reverse signal on line 410 being
set to the low (Itot!) logic level which causes the print wheel
to rotate clockwise (cw) to its home position. With the
ribbon in the down position, the ribbon lift signal on line
501 is set at the low ("0") logic level resulting in a high
("1") logic level on line 507 and a low ("0") logic level on
line 506. The timing signal on line 503 is normally set at the
high logic level and is pulsed to the...