Browse Prior Art Database

Two-Step Pressure-Controlled Paper-Feed Mechanism

IP.com Disclosure Number: IPCOM000100938D
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

Akino, T: AUTHOR [+3]

Abstract

Disclosed is a feed mechanism that is able to adjust the pressure between a pinch roller and a feed roller in accordance with the kind of paper to realize a stable feed of the paper.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 97% of the total text.

Two-Step Pressure-Controlled Paper-Feed Mechanism

       Disclosed is a feed mechanism that is able to adjust the
pressure between a pinch roller and a feed roller in accordance with
the kind of paper to realize a stable feed of the paper.

      Fig. 1 shows the structure of the paper feed mechanism. Links 2
and 3 transfer the motion of a cam 1 to a pinch roller unit 4.
The pinch roller unit 4 rotates according to the position of the cam
1, and pressure is generated between a feed roller 5 and a pinch
roller 6.

      Fig. 2 shows the structure of pinch roller unit 4. This unit
has two different types of springs, i.e., a coil spring 7 and a
torsion spring 8.  The combination of these two types of springs
makes it possible to realize the big difference of pressure force
while the movement caused by the cam is maintained small.

      This paper-feed mechanism has three modes: roller open mode,
low pressure mode and high pressure mode.  Fig. 3 shows the roller
open mode.  There is a gap between the pinch roller and feed roller.
Then, both the torsion spring and the coil spring do not operate.
Fig. 4 shows the low pressure mode, which is selected for a
continuous form.  The torsion spring operates, but the coil spring
does not operate.  Fig. 5 shows the high pressure mode, which is
selected for a cut form.  Both the torsion spring and the coil spring
operate.

      This feed mechanism makes it possible to feed the various
papers in a stable manner...