Browse Prior Art Database

Acoustically Improved Envelope Conditioning Fuser

IP.com Disclosure Number: IPCOM000120847D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 79K

Publishing Venue

IBM

Related People

Curry, SA: AUTHOR [+3]

Abstract

Disclosed is a device for controlling the roll closing velocity of an envelope conditioning fuser, resulting in improved acoustic levels.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Acoustically Improved Envelope Conditioning Fuser

      Disclosed is a device for controlling the roll closing
velocity of an envelope conditioning fuser, resulting in improved
acoustic levels.

      The envelope conditioning apparatus utilizes a linear solenoid
to open and close the fuser rolls.  Most of the noise produced by
this apparatus is generated on the opening stroke of the solenoid
which corresponds to the closing of the fuser rolls.  Attempts to
control this closure velocity by means of dashpots and various
current profiles to the solenoid have had limited success.
Tolerances on parameters, such as solenoid force, driver current,
fuser roll bias spring force, power supply voltage, and solenoid air
gap, result in significant variations in system dynamics and
acoustics.

      This invention involves coupling a mass to the moving parts of
the apparatus during the closure stroke of the fuser rolls to
decrease the closure velocity and thus reduce noise.  The energy
transferred to the coupled mass during the closure stroke is
dissipated during the interval between solenoid pulses.

      A specific embodiment of the invention is shown in the figure
and contained in this description.  Referring to the figure, an
inertia wheel 1 is connected to a shaft 2 which is supported by
bearings 3.  The shaft 2 passes through a one-way clutch 4 which is
attached to a bellcrank 5.  One end of link 6 is connected to bell
crank 5 by pin 7.  The bellcrank 5 is free to rotate relative to link
6.  The other end of link 6 is rigidly attached to the core 8 of
so...