EP0877973A1 - 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
- EP0877973A1 EP0877973A1 EP96934383A EP96934383A EP0877973A1 EP 0877973 A1 EP0877973 A1 EP 0877973A1 EP 96934383 A EP96934383 A EP 96934383A EP 96934383 A EP96934383 A EP 96934383A EP 0877973 A1 EP0877973 A1 EP 0877973A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- release agent
- fixing roller
- application
- supply roll
- application element
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S118/00—Coating apparatus
- Y10S118/01—Anti-offset
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. a photoconductor drum, which is then colored with a developer mixture from a developer station due to 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 Contains longitudinal openings. Release agent pumped into the dosing tube emerges from the openings and thus reaches the application element.
- the application element picks up the release agent and transfers it to the surface of the fixing roller.
- the absorption capacity is determined by the material, the material thickness and the degree of contamination. Thick nonwovens are used as application elements. These can absorb a certain amount of dirt. With increasing pollution that becomes
- fleece allows less and less release agent to pass through to the fixing roller, so that in extreme cases it prevents the release agent from being fed to the fixing roller. For this reason, the fleece is renewed continuously or at intervals.
- a supply roll is provided in DE 38 42 147 on which the fleece is wound.
- a take-up roll winds up dirty fleece again.
- the transport speed of the fleece is determined by the constant rotation speed of the take-up roll.
- the transport speed of the fleece therefore increases with increasing diameter of the take-up roll.
- the cleaning effect of the fleece increases with the transport speed of the fleece.
- the transport speed of the fleece is therefore designed such that the lower speed at the beginning of the fleece is just sufficient to achieve a sufficient cleaning effect.
- the length of the fleece is relatively small due to its thickness and the associated spatial restrictions, the fleece's transport speed is so high towards the end of the fleece supply that it is too high to achieve a satisfactory cleaning effect. This requires frequent replacement of the fleece and thus short maintenance intervals.
- the present invention is therefore based on the object of a release agent application device for applying To design release agent on the surface of a fixing roller of an electronic printing or copying machine in such a way that the maintenance intervals are extended while the cleaning effect is constant and reliable.
- the application element is wound on a supply roll.
- a sensor is coupled to the supply roll, which detects the rotational speed, for example in the form of pulses. It outputs these impulses to a control unit, which in turn controls the speed of a motor that drives the take-up roll.
- the control unit therefore knows the rotational speeds of both rollers.
- the total length of the application element is also known.
- the control unit uses these variables to calculate the actual speed of the application element and compares it with a target speed.
- the control unit slows down or accelerates the engine speed in accordance with the comparison result, so that the result is a constant transport speed of the application element, which corresponds to the target speed.
- the control unit also determines the end of the application element.
- the end of the application element was designed so that it operated a switch as soon as it was removed from the supply roll. This caused the switch to be actuated to fail, so that the end of the application element came into contact with the surface of the fixing roller. With a corresponding design of the end, for example a strip was attached there, this could lead to the destruction of the fixing roller.
- the control unit recognizes the end of application elements. due to the standstill or the slowing down of the supply roll and then switches off the engine. In addition, a corresponding message can be output to the central control of the electrographic printing or copying device.
- 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 a clogging of the fleece by dirt can be prevented.
- the thin fleece enables fast and direct fixing roller filling.
- a particular advantage is the improved capillary action and absorbency. The transfer of the release agent to the fleece using the
- Figure 2 is a schematic representation of an application element with supply roll and means of transport
- FIG. 3 shows a basic illustration of a sensor unit for detecting the rotation of the supply roll.
- a release agent application device shown in FIG. device for applying release agent L to the surface of a fixing roller F.
- the basic illustration shows the fixing roller F, which rotates clockwise. The pressure roller of the fixing station and the record carrier guided between the two rollers are not shown. However, the device for applying release agent to the surface of the fixing roller F is shown.
- the application element V is a fleece which 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 transport direction of the application element V caused by the motor MO runs counter to the movement of the fixing roller F, so that the used application element V carries with it all impurities picked up by wiping off the surface of the fixing roller F and always has a sufficient area relatively fresh Application Element V is available.
- 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 S1, S2, which are arranged in the region of the end faces of the guide elements ÜB, OB.
- the management elements ÜB, OB perform a further task.
- the wick D is in contact with the application element V, whereby the release agent L can be absorbed by the application element. This can then release the release agent L to the fixing roller F.
- the application element V is unrolled in a clockwise direction from a supply roll W, is guided along the fixing roller F and is wound up by a receptacle AV.
- the take-up roller AV is driven counterclockwise by a motor MO.
- the speed of rotation of the supply roll W is detected by a sensor H.
- the speed of the motor MO is determined by a control device CON.
- This control device CON is coupled to the sensor H and evaluates the information supplied by the sensor.
- the diameter of the take-up roller AV is correspondingly small, since, for example, there is only one position of the application element V on the take-up tube AVR of the take-up roller AV.
- a constant engine speed would lead to a constant speed of rotation of the receiving tube AVR Have consequence.
- the transport speed of the application element would increase.
- the diameter of the take-up reel AV increases, the diameter of the supply reel W decreases. The rotational speed of the supply reel W increases accordingly when the application element V is unwound, assuming a constant speed of the application element V.
- the control unit CON knows the rotational speed of the supply roll W on the basis of the information available from the sensor H.
- the control unit CON determines the rotational speed of the take-up roller AV itself, which is why this rotational speed is also known.
- the control unit compares the engine speed with the speed of the supply roll W and uses this to determine the extent to which the application element V has already been processed. From this, it calculates the diameter of the supply roll W.
- the actual speed of the application element V can be calculated from the diameter of the supply roll W and its speed.
- the actual speed of the application element V is compared with a target value. If the actual value deviates from the target value, the control unit CON adjusts the speed of the motor MO accordingly. If the motor MO is a stepper motor, the duration of this stepper motor MO is changed accordingly.
- a Hall sensor H is used to determine the rotational speed of the supply roll W.
- the Hall sensor H is arranged according to FIG. 3 on the front side of the supply roll W.
- the pin HSS penetrates coaxially into the axis WA of the supply roll W and is coupled to it so that the pin HSS transmits the rotary movement of the axis of the supply roll W to the disk HS.
- the A magnet HL is assigned to magnets HM located on the disc HS. It is located in the immediate vicinity of the magnet HM rotating around the pin HSS.
- a reliable function of the hall sensor HL can only be guaranteed if very narrow tolerances, for example +/- 0.2 millimeters, with regard to the distance to the magnets HM are maintained both in the radial and in the axial direction. These narrow tolerances are maintained in that the pin HSS protrudes from the surface of the disc HS by a defined length. This part of the HSS is located on the same side as the magnets HM.
- the pin HSS has an axial bore HB in this area, into which a pin HLS connected to the Hall sensor HL can be inserted.
- a mounting plate HP is attached to this pin HLS and is parallel to the surface of the disc HS carrying the magnets HM.
- the Hall sensor HL is arranged on the side of the plate HP facing the magnet HM.
- the plate HP is supported on a fixed angle HW, so that a rotational movement of the pin HSS coupled to the disc HS is not transmitted to the pin HLS coupled to the plate HP, and a fixed position of the Hall sensor HL in the radial direction is thus achieved.
- the construction of the sensor H can also take place in the opposite way.
- a magnet HM can be arranged on the plate HP. Accordingly, on the disc HS instead of the dimensions If HM a plurality of Hall sensors HL are arranged.
- a single magnet can be arranged on the disc HS and the plate HP can be made so large that a plurality of Hall sensors HL can be arranged in a fixed position thereon. The rotating magnet would then influence the plurality of Hall sensors HL on its way.
- the sensor H thus detects any movement of the supply roll W. Depending on the rotational speed, electrical pulses are transmitted to the control unit CON at certain time intervals. If the control unit CON receives no pulses from the sensor H in the time intervals known to it, although the motor MO drives the take-up roller AV, the control unit CON recognizes the end of the application element V. The control unit CON issues a corresponding message to the control of the printing or copying machine, so that a new roll with the application element V can be inserted into the machine.
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 |
---|---|---|---|
DE19602774 | 1996-01-26 | ||
DE19602774 | 1996-01-26 | ||
PCT/DE1996/001588 WO1997027518A1 (de) | 1996-01-26 | 1996-08-27 | Trennmittelauftragsvorrichtung zum auftragen von trennmittel auf die oberfläche einer fixierwalze eines elektrografischen druck- oder kopiergerätes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0877973A1 true EP0877973A1 (de) | 1998-11-18 |
EP0877973B1 EP0877973B1 (de) | 2001-07-18 |
Family
ID=7783748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96934383A Expired - Lifetime EP0877973B1 (de) | 1996-01-26 | 1996-08-27 | Trennmittelauftragsvorrichtung zum auftragen von trennmittel auf die oberfläche einer fixierwalze eines elektrografischen druck- oder kopiergerätes |
Country Status (5)
Country | Link |
---|---|
US (1) | US6070044A (de) |
EP (1) | EP0877973B1 (de) |
JP (1) | JP2000503419A (de) |
DE (1) | DE59607330D1 (de) |
WO (1) | WO1997027518A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6266496B1 (en) * | 2000-04-13 | 2001-07-24 | Lexmark International, Inc. | Constant displacement oil web system and method of operating the same |
US6347197B1 (en) * | 2000-10-20 | 2002-02-12 | Lexmark International, Inc. | Life determination in an oil web system |
US6445901B1 (en) * | 2001-01-23 | 2002-09-03 | Kenneth R. Rasch | Fuser release agent management system with driven supply reel |
US20050175379A1 (en) * | 2004-02-09 | 2005-08-11 | Berg Richard H. | Web oiler speed control |
JP5422920B2 (ja) * | 2008-05-23 | 2014-02-19 | セイコーエプソン株式会社 | 記録装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2104841B (en) * | 1981-07-10 | 1985-10-16 | Konishiroku Photo Ind | Method of fixing toner image and apparatus therefor |
US4569864A (en) * | 1983-06-30 | 1986-02-11 | Acumeter Laboratories, Inc. | Roll coating applicator and adhesive coatings and the like and process of coating |
JPS6146965A (ja) * | 1984-08-10 | 1986-03-07 | Hitachi Koki Co Ltd | 定着装置 |
JPS63276079A (ja) * | 1987-05-08 | 1988-11-14 | Canon Inc | 定着器の定着面クリ−ニング装置 |
JPH01214884A (ja) * | 1988-02-23 | 1989-08-29 | Minolta Camera Co Ltd | 複写機及びその定着ローラ用ウエブ |
JPH058900A (ja) * | 1991-06-06 | 1993-01-19 | Canon Inc | シート厚検出装置を有する画像形成装置 |
US5576821A (en) * | 1995-12-18 | 1996-11-19 | Xerox Corporation | Fuser release agent management (RAM) system having a non-continuous pattern agent roll |
US5836532A (en) * | 1996-12-05 | 1998-11-17 | E. I. Du Pont De Nemours And Company | System and method for on-line missing/gained filament detection |
-
1996
- 1996-08-27 DE DE59607330T patent/DE59607330D1/de not_active Expired - Lifetime
- 1996-08-27 US US09/117,319 patent/US6070044A/en not_active Expired - Lifetime
- 1996-08-27 WO PCT/DE1996/001588 patent/WO1997027518A1/de active IP Right Grant
- 1996-08-27 EP EP96934383A patent/EP0877973B1/de not_active Expired - Lifetime
- 1996-08-27 JP JP9526395A patent/JP2000503419A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9727518A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0877973B1 (de) | 2001-07-18 |
DE59607330D1 (de) | 2001-08-23 |
JP2000503419A (ja) | 2000-03-21 |
WO1997027518A1 (de) | 1997-07-31 |
US6070044A (en) | 2000-05-30 |
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