EP0876638A1 - Trennmittelauftragsvorrichtung zum auftragen von trennmittel auf die oberfläche einer fixierwalze eines elektrografischen druck- oder kopiergerätes - Google Patents
Trennmittelauftragsvorrichtung zum auftragen von trennmittel auf die oberfläche einer fixierwalze eines elektrografischen druck- oder kopiergerätesInfo
- Publication number
- EP0876638A1 EP0876638A1 EP96930020A EP96930020A EP0876638A1 EP 0876638 A1 EP0876638 A1 EP 0876638A1 EP 96930020 A EP96930020 A EP 96930020A EP 96930020 A EP96930020 A EP 96930020A EP 0876638 A1 EP0876638 A1 EP 0876638A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- release agent
- fixing roller
- wick
- ubr
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/20—Details of the fixing device or porcess
- G03G2215/2093—Release agent handling devices
Definitions
- Release agent application device for applying release agent to the surface of a fixing roller of an electrographic printing or copying device
- the invention relates to a release agent application device.
- the separating agent application device applies separating liquid to the surface of a fixing roller of an electrographic printing or copying device which works according to the transfer printing principle.
- charge images are placed on an intermediate carrier, e.g. produced by a photoconductor drum, which are then colored with a developer mixture of a developer station on the basis of electrostatic or magnetic forces.
- the colored charge images are transferred to a recording medium in the form of single sheets or continuous paper in a transfer printing station and then thermally fixed.
- thermal fixing it is known from US-A-33 24 791 to use a fixing station with two rollers, between which the carrier of the toner image is moved. The one fixing roller facing the toner image is heated, the other presses the carrier with the toner image against the fixing roller. The toner is then melted down by heat and pressure.
- DE-C-39 42 147 discloses a separating agent application device for applying this separating liquid to the fixing roller, in which an application element consisting of felt is pressed against the fixing roller by a pressure element extending along the fixing roller.
- a metering tube is provided on the side of the application element facing away from the fixing roller Includes longitudinal openings. Release agent pumped into the dosing tube emerges from the openings and thus reaches the application element.
- a rotatable control wedge is contained in the metering tube. Depending on the position of this control wedge, more or fewer outlet openings can be closed, as a result of which release agent is only released to the area of the fixing roller that comes into contact with the recording medium.
- the position of the control wedge is always adjusted by a servomotor to the recording medium width worked out in the printing or copying machine.
- the release agent application device is exposed to high temperatures due to its direct contact and the heated fixing roller. These high temperatures lead to a particular load on the motor for adjusting the control wedge in the metering tube. This servomotor therefore often fails to work.
- the present invention has for its object to provide a release agent application device for applying release agent to the surface of a fixing roller of an electrographic printing or copying device, which reliably fills the film even under high thermal stress. Xierwalz can be used reliably without disturbing the print image and without contamination of the fixing station and neighboring units of the printing or copying machine.
- the solution according to the invention ensures reliable oiling of the fixing roller without disturbing the printed image and without contamination of the fixing station and neighboring units of the photocopier, even when subjected to high thermal loads. Adjustment mechanisms are completely dispensed with in the solution. Due to the interaction of the channel and wick, the required amount of release agent is always available along the fusing roller.
- the gutter contains a certain amount of liquid that is evenly distributed in the gutter due to gravity.
- the release agent can be fed to the channel continuously or at intervals on one side and removed on the other side. However, the channel is preferably closed at its ends.
- the wick dips into the gutter over its entire longitudinal extent.
- the wick absorbs the release agent from the channel by capillary action. This capillary action ensures that in areas in which a larger amount of release agent is released from the wick to the application element, a corresponding amount of the release agent is sucked up by the wick.
- Good capillary action and absorbency are achieved when using PTFE, polyaramide, polyemide and combinations of these materials. Due to the wick's good absorbency, it also serves as a release agent reservoir. Due to these storage effects, it is possible to react to fluctuating release agent requirements. In addition, an uneven supply of the release agent to the wick does not affect the quality of the release agent application on the fixing roller.
- the release agent is fed directly to the wick.
- a release agent metering tube extends along the wick over the usable width of the fixing roller. Release agent is released to the wick from outlet openings of this release agent metering tube. Excess release agent gets into the channel from the wick. This causes the wick to absorb the release agent more quickly.
- a distance between the release agent metering tube and the wick is preferably bridged by an elastic lip. This is coupled to the release agent metering tube in a liquid-tight manner and is inclined towards the channel. This lip ensures that all the separating agent emerging from the outlet openings is directed to the wick.
- the outlet openings are arranged accordingly above the coupling area between the release agent metering tube and the lip.
- the channel is part of the lower guide element.
- the upper guide element contains an undercut longitudinal groove into which a thickened long side of the wick can be drawn.
- the wick can thus be drawn into the longitudinal groove of the upper guide element from one side.
- the undercut of this longitudinal groove ensures a secure hold of the wick in the upper guide element. Since the wick dips into the groove on one side and is located in the longitudinal groove on the opposite side, it connects the lower and the upper guide element to one another.
- the channel closed on both sides has walls of different heights in their longitudinal extensions.
- the lower wall lies against the application element so that excess release agent is released to the application element. If the release liquid level exceeds the low wall, it flows in the direction of the application element and is picked up and transported away by it. There is thus a defined overflow which cannot lead to contamination of the fixing station and adjacent functional element of the printing or copying device by dripping the separating agent.
- the pressure body is spring-mounted. This springing ensures tolerance compensation of the rotating roller and thermal loads exposed to the release agent application device. Precise adjustment work is not necessary due to the spring of the pressure body towards the fixing roller.
- a fleece with a thickness between 0.2 and 0.3 mm serves as the application element.
- This fleece is much thinner than conventional fleece.
- Polyarmide, polyemide and Teflon or combinations thereof are preferably used as the nonwoven material.
- a longer length of the fleece can be wound up in a small space. If the maintenance intervals remain unchanged, an increased fleece speed can be achieved due to the increased fleece length. This ensures a higher quality of cleaning of the fixing roller, because clogging of the fleece by dirt can be prevented.
- the thin fleece enables quick and direct oiling of the fuser roller.
- a particular advantage is the improved capillary action and absorbency. The transfer of the release agent to the fleece using the
- FIG. 1 is a schematic sectional view of a release agent application device with fixing roller and
- FIG. 2 shows a perspective illustration of an upper guide means according to FIG. 1.
- a release agent application device shown in FIG. 1 for applying release agent L to the surface of a fixing roller F is assigned in a heat setting station.
- the basic illustration shows the fixing roller F, which rotates clockwise.
- the pressure roller of the fixing station and the recording medium guided between the two rollers are not shown.
- the device for applying release agent to the surface of the fixing roller F is shown.
- a fleece serving as the application element V has a thickness of 0.2 to 0.3 mm. It consists of polyarmide, polyemide or teflon.
- the application element V applies silicone oil or another suitable heat-resistant release agent in liquid form, preferably to the entire surface of the fixing roller F. In order to guarantee this, the application element V extends with its entire width over the entire axial length of the fixing roller F.
- the application element V is also applied to the fixing roller F in a predetermined circumferential area.
- the application element V In the operating state, the application element V is in constant contact with the surface of the fixing roller F.
- the application element V picks up dirt particles, such as toner particles or dust carried by the recording medium.
- the area of the application element V which is in contact with the fixing roller F is preferably renewed either continuously, slowly, but also in sections at intervals.
- the take-up roll is driven, for example, by a motor.
- the direction of transport of the application element caused by the motor runs counter to the movement of the fixing roller F, so that the used application element V carries all the contaminants picked up by wiping off the surface of the fixing roller F and there is always a sufficient area of relatively fresh application element V available stands.
- the circumferential area at which the application element V stands with the surface of the fixing roller F is defined by the distance between two guide elements OB, ÜB extending parallel to one another in the axial direction of the fixing roller F.
- These guide elements ÜB, OB are arranged vertically one above the other so that one can speak of an upper guide element OB and a lower guide element ÜB.
- the two guide elements OB, ÜB are pressed to the surface of the fixing roller F by springs SI, S2, which are arranged in the region of the end faces of the guide elements ÜB, OB.
- the arrangement of the springs SI, S2 and their direction of action can be recognized by arrows FS1, FS1 'in FIG. 2.
- the guide elements ÜB, OB each have a web ST1, ST2.
- This web ST1, ST2 is captively locked in the chassis of the fixing station.
- the form fit is designed so that on the one hand a sufficient local stability of the guide elements ÜB, OB is ensured and on the other hand there is sufficient play which allows the guide elements ÜB, OB to be pressed against the entire length of the guide elements by means of the springs SI, S2 Press the surface of the fuser roller F. This ensures that the application element V is pressed evenly against the surface of the fixing roller F, regardless of thermal and geometric tolerances.
- the oscillation of the guide elements ÜB, OB thus ensures an even distribution of the release agent L.
- a thickened longitudinal side LS of a wick D can be drawn into an undercut longitudinal groove LN which extends in the upper guide element OB.
- the wick preferably extends over the entire length of the guide elements ÜB, OB.
- the long side of the wick D opposite the thickened long side LS plunges into a channel UBR which extends longitudinally in the lower guide element ÜB.
- the channel UBR is open on the side facing the upper guide element OB.
- the longitudinal groove LN and the channel UBR run parallel to one another. Their vertical spacing from one another corresponds approximately to the width of the wick D.
- the wick D hangs from the upper guide element OB into the channel UBR of the lower guide element ÜB substantially without wave formation, similar to a suspended cloth.
- the arrangement of the longitudinal groove LN and the channel UBR is chosen so that the wick D touches the application element V over the entire longitudinal extent. This ensures that the application element V is supplied with release agent L, which is released by the wick D.
- the wick D receives the release agent L in two places. On the one hand, the wick D immersed in the groove sucks off the separating agent L there by capillary action.
- suitable wick materials such as PTFE, polyaramide and polyemide and their combinations, the capillary action and absorbency for the good distribution of the release agent L are supported.
- the good capillary action also ensures that a sufficient amount of this release agent is always available in areas along the longitudinal extent of the fixing roller F in which there is an increased consumption of release agent L.
- the channel UBR which is closed on both sides like a tub, supports the distribution effect of the release agent L.
- the release agent in the channel UBR can very quickly reach the areas with high release agent. flow, where it can be taken up by the wick D on a short way.
- the actual release agent is supplied through a release agent metering tube R.
- This release agent metering tube R extends in the axial direction of the fixing roller F in the vicinity of the side of the wick D facing away from the fixing roller F.
- a plurality of openings O are provided in defined distances in the tube wall facing the wick D. introduced, from which release agent L can escape.
- the release agent metering tube R is preferably closed at one end and receives release agent L on the open side via a feed system, for example made of a hose and a pump, which can only exit from the openings 0 in the direction of the wick.
- an elastic lip is glued to the surface of the release agent metering tube R in an area below the openings O.
- This elastic lip G bridges a distance between the separating agent metering tube R and the wick D over their entire longitudinal extent.
- the elastic lip G rests under tension with its free end on the wick D.
- the lip G is preferably inclined in the direction of the channel UBR, which ensures that the release agent L flows away quickly.
- the lower guide element UB which contains the channel UBR, is designed in such a way that the channel wall, which runs in the area of the support element V, is lower than the tube-side wall. Excess release agent L therefore does not flow on the pipe side, but instead flows off to application element V. The application element V receives the excess release agent L, through which it is transported away.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19602775 | 1996-01-26 | ||
DE19602775 | 1996-01-26 | ||
PCT/DE1996/001471 WO1997027517A1 (de) | 1996-01-26 | 1996-08-06 | Trennmittelauftragsvorrichtung zum auftragen von trennmittel auf die oberfläche einer fixierwalze eines elektrografischen druck- oder kopiergerätes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0876638A1 true EP0876638A1 (de) | 1998-11-11 |
EP0876638B1 EP0876638B1 (de) | 2001-11-07 |
Family
ID=7783749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96930020A Expired - Lifetime EP0876638B1 (de) | 1996-01-26 | 1996-08-06 | Trennmittelauftragsvorrichtung zum auftragen von trennmittel auf die oberfläche einer fixierwalze eines elektrografischen druck- oder kopiergerätes |
Country Status (4)
Country | Link |
---|---|
US (1) | US6072978A (de) |
EP (1) | EP0876638B1 (de) |
DE (1) | DE59608165D1 (de) |
WO (1) | WO1997027517A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8075129B2 (en) * | 2009-03-31 | 2011-12-13 | Xerox Corporation | System and method for optimizing printing throughput and print quality by evaluating image content |
JP5407620B2 (ja) * | 2009-07-15 | 2014-02-05 | 株式会社リコー | オイル塗布装置およびそれを備えた定着装置ならびに電子写真装置 |
US8317286B2 (en) * | 2010-03-09 | 2012-11-27 | Xerox Corporation | System and method for improving throughput for duplex printing operations in an indirect printing system |
US8317314B2 (en) * | 2010-03-09 | 2012-11-27 | Xerox Corporation | System and method for improving throughput for printing operations in an indirect printing system |
US8662657B2 (en) | 2011-04-08 | 2014-03-04 | Xerox Corporation | Print process for duplex printing with alternate imaging order |
US8882223B2 (en) | 2012-07-31 | 2014-11-11 | Xerox Corporation | Method of printing with a split image revolution |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3324791A (en) * | 1964-12-31 | 1967-06-13 | Xerox Corp | Xerographic roller fuser drive apparatus |
US3718116A (en) * | 1971-07-20 | 1973-02-27 | Xerox Corp | Oil dispensing apparatus |
US3859957A (en) * | 1973-10-23 | 1975-01-14 | Minnesota Mining & Mfg | Release fluid applicator |
DE2703382C3 (de) * | 1977-01-27 | 1979-07-19 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Vorrichtung zur Zuführung von Trennflüssigkeit zur Oberfläche einer Fixierwalze |
US5049944A (en) * | 1989-04-07 | 1991-09-17 | Xerox Corporation | Method and apparatus for controlling the application of a fuser release agent |
DE3941195A1 (de) * | 1989-12-13 | 1991-06-20 | Siemens Ag | Reinigungsvorrichtung fuer die fixierwalze eines elektrofotografischen druck- oder kopiergeraetes |
US5145525A (en) * | 1990-10-09 | 1992-09-08 | Xerox Corporation | Oil handling around a metering roll |
JPH10260604A (ja) * | 1997-03-19 | 1998-09-29 | Sharp Corp | 定着装置 |
-
1996
- 1996-08-06 US US09/117,317 patent/US6072978A/en not_active Expired - Lifetime
- 1996-08-06 WO PCT/DE1996/001471 patent/WO1997027517A1/de active IP Right Grant
- 1996-08-06 DE DE59608165T patent/DE59608165D1/de not_active Expired - Lifetime
- 1996-08-06 EP EP96930020A patent/EP0876638B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9727517A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0876638B1 (de) | 2001-11-07 |
WO1997027517A1 (de) | 1997-07-31 |
US6072978A (en) | 2000-06-06 |
DE59608165D1 (de) | 2001-12-13 |
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