Browse Prior Art Database

Paper Feed Mechanism for Computer Printer

IP.com Disclosure Number: IPCOM000099857D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Bast, CA: AUTHOR [+2]

Abstract

Disclosed is a printer continuous form feed mechanism with improved reverse feed capability. This is accomplished by means of a positive reverse drive system which disengages during forward forms feeding to reduce drag and wear.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Paper Feed Mechanism for Computer Printer

       Disclosed is a printer continuous form feed mechanism
with improved reverse feed capability.  This is accomplished by means
of a positive reverse drive system which disengages during forward
forms feeding to reduce drag and wear.

      Figs. 1 and 2 show standard views of this mechanism. Forms 1
pass between reverse idler rollers 8 and reverse drive rollers 3
between drag fingers 4 and bar 5 between platen 6 and print mechanism
7 and through tractor 8.

      To feed forms 1 forward (up), motor 9 turns counter-clockwise,
causing belt 10 to drive tractor shaft 11 and lower drive shaft 12
counter-clockwise.  Tractors 8 pull forms 1 past drag fingers 4 and
print mechanism 7.  Reverse drive rollers 3, affixed to reverse drive
shaft 13, do not rotate at this time because one-way clutch 14,
connecting lower drive shaft 12 to reverse drive shaft 13, transmits
torque only in the clockwise direction.  Also, since the
circumference of each reverse drive roller 3 is interrupted, forms 1
are not pinched between reverse drive rollers 3 and reverse idler
rollers 2.  Thus, the reverse drive mechanism adds minimum drag to
forms 1.  Reverse drive rollers 3 are held in proper orientation by
detent spring 15, engaging detent wheel 16 which is affixed to
reverse drive shaft 13.

      To feed forms 1 in reverse (down), motor 9 turns clockwise,
causing belt 10 to drive tractor shaft 11 and lower drive shaft 12
clockwise. ...