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Browse Prior Art Database

Toner Seal for Printer

IP.com Disclosure Number: IPCOM000101531D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Craft, JA: AUTHOR [+4]

Abstract

Disclosed is a single part lip seal for insuring that toner does not leak past the ends of the developer roll in an electrophotographic printer. This seal incorporates a spiral lip along the surface of the rotating developer roll. The effect of this spiral is to push the toner away from the ends of the developer roll leaving a clean area on each end.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 80% of the total text.

Toner Seal for Printer

       Disclosed is a single part lip seal for insuring that
toner does not leak past the ends of the developer roll in an
electrophotographic printer.  This seal incorporates a spiral lip
along the surface of the rotating developer roll. The effect of this
spiral is to push the toner away from the ends of the developer roll
leaving a clean area on each end.

      A difficult point to seal in a developer is the point where the
developer roll, doctor blade, and housing come together.  This seal
addresses the sealing between the doctor blade and the housing and
between the developer roll and the housing.

      The accompanying figure shows two "V" -shaped lips which
contact the developer roll on the doctor blade on one side of the "V"
and the developer housing on the other side of the "V".  The pressure
of the toner expands the "V" outward to provide the seal.  The top,
straight portion of the seal provides the seal between the doctor
blade and the housing, and the bottom, curved portion provides the
seal between the developer roll and the housing.  This integrated
seal provides a simple one-piece seal to effectively seal between
these various components which move relative to each other.

      The sealing is enhanced by making use of the rotation of the
developer roll.  Referring to the figure, the lip running against the
developer roll is seen to be short at the bottom but to become longer
as the straight portion is approache...