EP2176153A1 - Vorrichtung und verfahren zum abziehen einer bahn aus bedruckbarem trägermaterial - Google Patents
Vorrichtung und verfahren zum abziehen einer bahn aus bedruckbarem trägermaterialInfo
- Publication number
- EP2176153A1 EP2176153A1 EP08786943A EP08786943A EP2176153A1 EP 2176153 A1 EP2176153 A1 EP 2176153A1 EP 08786943 A EP08786943 A EP 08786943A EP 08786943 A EP08786943 A EP 08786943A EP 2176153 A1 EP2176153 A1 EP 2176153A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- drive roller
- coupling
- clutch
- roller
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/042—Sensing the length of a web loop
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/048—Registering, tensioning, smoothing or guiding webs longitudinally by positively actuated movable bars or rollers
Definitions
- the invention relates to a device for removing a web of carrier material in a printer or copier, wherein the web is guided between a drive roller and a pressure roller.
- the drive roller is driven by a motor.
- the invention relates to a method for removing a web.
- the present invention can be used in particular in electrographic printers and copiers, in which a tractor-less transport of the continuous web of carrier material takes place.
- the substrate is first provided with a toner image and the web is further conveyed to a fuser station.
- the web In the area between the transfer printing and the fixing, the web must not sag, but must be taut in a tension state, so that the not yet fixed toner image on the web does not come into contact with other parts of the device and is blurred.
- known loop drawers can be used which generate the web tension by the weight of a dancer roller, wherein fixing rollers hold the web in the downstream fixing station.
- the web is guided between a drive roller and a pressure roller.
- the drive roller is driven by an engine via an electrically controllable clutch.
- the clutch is driven so that the web is acted upon by the drive roller with a predetermined tensile force.
- the web tension can be adjusted to different values. Furthermore, the web tension can be adjusted during printing operation and even when the web is stationary so that no or only a minimal slip occurs.
- the motor itself can be operated to convey the web at a speed greater than the speed of the web in a printing operation. The reduction to the process Speed when printing or other values, for example, when the train is at a standstill, via the electrically controllable coupling, wherein the engine continues to rotate.
- FIG. 1 shows an embodiment of the invention is a schematic diagram in which a motor drives a drive roller via an electrically actuated clutch.
- a continuous web 10 of a printable carrier material between a drive roller 12 and a pressure roller 14 is guided.
- the surface of the drive roller 12 is made of metal.
- the pressure roller 14 comprises a plurality of spaced-apart cylinders made of heat-resistant plastic, preferably made of Teflon.
- the hulls are thus made of hard material, so that the web 10 is guided between the rollers 12, 14 with almost no wrap angle.
- the drive roller 12 and the pressure roller 14 are arranged in the transport direction Pl during normal printing operation in the immediate vicinity, just behind a fuser 16 containing a pair of fixing rollers 18, the toner images on the web 10 using pressure and temperature fix. In the case of a standstill of the web 10, the fixing roller pair 18 can be moved apart so that the web 10 is not exposed to high temperature and pressure.
- the drive roller 12 is driven by a motor 20, preferably a stepper motor, via an electrically controllable coupling 22.
- a clutch preferably a hysteresis clutch or a magnetic powder clutch can be used, wherein the coupling efficiency depends on the supplied current I of a controller 24 is continuously adjustable.
- the magnetic powder clutch is a friction clutch.
- a metal powder or metal gel In the gap between a drive pressure plate and an output pressure plate is a metal powder or metal gel.
- the electromagnet housed in a pressure plate magnetizes and stiffens the metal particles. As a result, a non-positive connection is achieved. By changing the supplied current, a firm connection or slip is generated. Without power, no forces are transmitted because the metal particles attach to the drive pressure plate by the centrifugal force.
- a coupling half is equipped with a hysteresis coating. This hysteresis material acts much like permanent magnets, but can be reversed with little energy. If the rated torque of the clutch is exceeded, the clutch starts to slip. In this case, the hysteresis material absorbs energy from the drive system through the constant reversal of polarity by the passing permanent magnets and converts them into heat loss, which is released to the environment.
- a speed sensor 26 detects the rotation of the drive roller 12. Depending on the detected rotation, the control 24 sets the current I.
- the optimum torque Mo to be transmitted by the clutch 22 is determined.
- This value Mo is found by the following control algorithm.
- the engine 20 is operated.
- the electrical coupling 22 is supplied with a current I, which acts on the web 10 via the drive roller 12 with a maximum allowable withdrawal force. Accordingly, the take-off roll 12 rotates. With the aid of the rotation speed sensor 26, the rotation of the take-off roll 12 is detected. Based on the maximum allowable trigger force of the current I is reduced to the clutch 22 until the drive roller 12 is stationary. At the speed "zero", ie standstill of the web 10, the associated value Mo is held in. At this value Mo, there is no slippage between the drive roller 12 and the surface of the web 10, so that after the control process has subsided no printed image may be printed In this way, a blurring of the printed image is minimized while still maximizing the pull-off force.
- This procedure can also be performed with each stop of the printer or copier.
- a second operating condition relates to the acceleration of the web 10 to process speed at which the web is printed continuously.
- a torque Ms is set, which is greater than Mo, so that with an acceleration of the web 10, the inertia of the participating Components are overcome.
- the drive roller 12 is accelerated in this operating state to the process speed at which a continuous pressure on the web 10 takes place.
- Vb herein is the speed of the web 10 at process speed.
- Vd is an excess velocity that is about 2 to 3% of the velocity Vb.
- a third operating condition relates to the normal printing process.
- the torque transmitted from the clutch 22 to the drive roller 12 decreases from Ms to Md, where Md is the torque under normal pressure operation.
- the drive roller 12 then has the transport speed of the web 10, which corresponds to the speed when printing the web 10.
- the motor 20 is operated at maximum speed Vmax.
- a fourth mode of operation involves stopping the web 10 and retracting the web 10 against the transport direction P1. This retraction is required because subsequent printing of the web 10 can only occur when the web 10 has been accelerated back to process speed Vb. For this purpose, a certain advance is required, which makes the retraction of the web 10 by a predetermined distance necessary.
- the drive roller 12 must be braked until it has zero speed.
- the torque transmitted for this purpose corresponds to the aforementioned value Md.
- the motor 20 is shut down in accordance with a ramp-shaped stopping characteristic to the value Vs, which corresponds to the speed during stand-by operation, in which the printer is in operation. in order to start printing after receiving the print data.
- the retraction of the web 10 against the transport direction Pl takes place with a torque Mr, where Mr is much larger than Md.
- the drive roller 12 rotates in accordance with a retraction speed Vr.
- the motor 20 rotates at the standby speed Vs.
- a fifth operating state relates to the stoppage of the web 10.
- the torque 22 is set by the clutch 22 Mo.
- the speed of the drive roller 12 is controlled to zero and remains at this value for the duration of this operating state.
- the motor 20 assumes the speed Vs.
- a sixth operating state relates to a long standstill phase of the web 10.
- the clutch 22 transmits the torque Mo.
- the drive roller 12 has the speed zero.
- the engine 20 is controlled to zero speed. In the case of a stepper motor, a holding current is applied to it.
- a seventh operating state relates to a slow forward movement in the transport direction Pl of the web 10, for example to drive out the end section of the web 10 from the printer.
- the maximum permitted torque Mm is first set by the clutch 22 and then adjusted to Mo.
- the speed of the drive roller 12 is set at the predetermined forward speed.
- the motor 20 is operated at stand-by speed Vs.
- An eighth operating condition relates to the slow backward movement of the web 10.
- the torque is set by the clutch 22 Mr.
- the pressure roller 12 rotates at the predetermined reverse speed.
- the motor 20 is set to stand-by speed Vs.
- a multiplicity of operating states required for a printer or copier can be generated. Since the device operates with high accuracy, a maximum possible torque Mm can be set, whereby a high web tension for the peeling is achieved. In each operating state of the printer or copier, an ideal for this state
- Torque can be adjusted. As a result, a constant and almost identical web tension can be generated in each operating state.
- paper-specific web tension can be set freely by an operator, or it is possible to fall back on table values of the web tension.
Landscapes
- Handling Of Sheets (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007037653A DE102007037653A1 (de) | 2007-08-09 | 2007-08-09 | Vorrichtung und Verfahren zum Abziehen einer Bahn aus bedruckbarem Trägermaterial |
PCT/EP2008/060336 WO2009019287A1 (de) | 2007-08-09 | 2008-08-06 | Vorrichtung und verfahren zum abziehen einer bahn aus bedruckbarem trägermaterial |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2176153A1 true EP2176153A1 (de) | 2010-04-21 |
EP2176153B1 EP2176153B1 (de) | 2013-10-02 |
Family
ID=39951440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08786943.4A Not-in-force EP2176153B1 (de) | 2007-08-09 | 2008-08-06 | Vorrichtung und verfahren zum abziehen einer bahn aus bedruckbarem trägermaterial |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110020043A1 (de) |
EP (1) | EP2176153B1 (de) |
DE (1) | DE102007037653A1 (de) |
WO (1) | WO2009019287A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8770878B2 (en) * | 2011-02-08 | 2014-07-08 | Xerox Corporation | System and method for monitoring a web member and applying tension to the web member |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2211933A5 (de) * | 1972-12-21 | 1974-07-19 | Piccolo Christian | |
JPS4991650A (de) * | 1972-12-30 | 1974-09-02 | ||
US3912145A (en) * | 1974-03-04 | 1975-10-14 | Butler Automatic Inc | Web tension control system |
JPS5448247A (en) * | 1977-09-22 | 1979-04-16 | Canon Inc | Continuous paper conveyor |
JPS5964463A (ja) * | 1982-10-04 | 1984-04-12 | Matsushita Graphic Commun Syst Inc | 給紙装置 |
DE3313404A1 (de) * | 1983-04-13 | 1984-10-18 | Stahlkontor Weser Lenze GmbH & Co KG, 3251 Aerzen | Vorrichtung zum transport von warenbahnen |
JP2634671B2 (ja) * | 1989-06-26 | 1997-07-30 | 三菱電機株式会社 | プリンタ |
JPH075585A (ja) * | 1993-06-14 | 1995-01-10 | Fuji Photo Film Co Ltd | 写真プリンタのペーパー巻取装置 |
US5694636A (en) * | 1995-01-18 | 1997-12-02 | Noritsu Koki Co., Ltd. | Photograghic processing apparatus |
JPH08262898A (ja) * | 1995-03-25 | 1996-10-11 | Asahi Optical Co Ltd | 記録紙乾燥防止機構 |
JPH10198099A (ja) * | 1996-12-27 | 1998-07-31 | Ricoh Co Ltd | 画像形成装置 |
US6261013B1 (en) * | 1999-04-01 | 2001-07-17 | Eltron International, Inc. | Door mounted roll support |
-
2007
- 2007-08-09 DE DE102007037653A patent/DE102007037653A1/de not_active Withdrawn
-
2008
- 2008-08-06 US US12/671,999 patent/US20110020043A1/en not_active Abandoned
- 2008-08-06 EP EP08786943.4A patent/EP2176153B1/de not_active Not-in-force
- 2008-08-06 WO PCT/EP2008/060336 patent/WO2009019287A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009019287A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20110020043A1 (en) | 2011-01-27 |
WO2009019287A1 (de) | 2009-02-12 |
DE102007037653A1 (de) | 2009-02-19 |
EP2176153B1 (de) | 2013-10-02 |
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