EP1088258A1 - Fixing station for fixing toner images on a supporting material with a mobile covering device - Google Patents
Fixing station for fixing toner images on a supporting material with a mobile covering deviceInfo
- Publication number
- EP1088258A1 EP1088258A1 EP99929252A EP99929252A EP1088258A1 EP 1088258 A1 EP1088258 A1 EP 1088258A1 EP 99929252 A EP99929252 A EP 99929252A EP 99929252 A EP99929252 A EP 99929252A EP 1088258 A1 EP1088258 A1 EP 1088258A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- station according
- fixing station
- carrier material
- fixing
- heat radiation
- 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
- 239000000463 material Substances 0.000 title abstract description 10
- 230000005855 radiation Effects 0.000 claims abstract description 84
- 239000012876 carrier material Substances 0.000 claims description 53
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000007639 printing Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 238000013016 damping Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000013021 overheating Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
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
- G03G15/2007—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using radiant heat, e.g. infrared lamps, microwave heaters
Definitions
- Fixing station for fixing toner images on a carrier material with a movable cover device
- the invention relates to a fixing station for fixing toner images on a carrier material, with a heating device with at least one heat radiation source which emits radiation in the direction of the carrier material, and with a covering device with which an undesired striking of radiation on the carrier material can be prevented.
- the toner image transferred from an intermediate carrier, generally a photoconductor, to the carrier material, generally paper, must be fixed, ie it must be bonded to the carrier material in a wipe and abrasion-resistant manner.
- Heat-pressure fixation is usually used in electrophotography today. If the substrate is not preheated, for example using a heating saddle, the processing speed is limited to approx. 0.5 m / s to 0.7 m / s.
- duplex printing in which the front and the back of a carrier material is printed, the fixing process is relatively difficult because both sides are covered with toner images that can still be blurred.
- a high fixing quality with simultaneous fixing of the front and the back of the carrier material can only be achieved with relatively soft fixing rollers, such as silicone rollers. These fuser rollers have a short lifespan and are inefficient. Such soft fuser rollers are therefore only used for printers with a relatively low print volume. Since soft fixing rollers are used on both sides of the carrier material, guiding the carrier material is problematic. Such fixing rollers are therefore not suitable for the processing of continuous paper. For the reasons mentioned, it is desirable to fix toner images as contactlessly as possible, it being possible to use a relatively broad spectrum of carrier material. Another goal of contactless fixation is to achieve a high fixation quality without blurring effects.
- a contactless fixing method is known in which the toner material is softened with the aid of a solvent so that it binds better to the fibers of the carrier material.
- the toner material is softened with the aid of a solvent so that it binds better to the fibers of the carrier material.
- it can happen that the color pigments are dissolved to different degrees, which can lead to color-dependent smearing of the toner images.
- the known environmental problems arise when using solvents.
- flash fixation Another known contactless fixing method is the so-called flash fixation, in which the toner is fixed on the carrier material with the help of high-energy light pulses.
- the wavelength of the radiation is usually in the visible to ultraviolet range of the spectrum. Since the different color toners absorb to different extents in this wavelength range, flash fixation is not suitable for multi-color printing.
- the fuser is used for an electrostatic printer to fix toner on paper.
- the covering device serves to prevent the impingement of radiation during a warm-up phase or during a standstill of the carrier material.
- the active surfaces of the heat radiation source that emit heat radiation face away from the carrier material.
- the covering device surrounds the heat radiation source, so that the warm-up phase is shortened.
- the heat radiation source is facing the carrier material and radiation can impinge unhindered on the germaterial Trä ⁇ .
- the heating device contains a heat radiation source, as a result of which the fixing process takes place without contact. Problems associated with guiding and pressurizing fuser rollers are thus avoided.
- a heat radiation source has the disadvantage that the heating and cooling of the carrier material is associated with a relatively high time constant, which can cause problems when printing starts, when the carrier material is at a standstill or when intermittent printing occurs.
- a covering device is proposed which can be moved into the beam path between the radiation source and the carrier material. With the aid of this covering device, defined exposure times for achieving an optimal fixation can be achieved even with frequent starting and stopping of the movement of the carrier material. Due to the contactless heating of the carrier material, high color reproducibility and uniformity in fixing the toner image can be achieved.
- the fixing station is preferably used for a printing device or copying device with high printing performance, which works in duplex printing mode, wherein toner images of the front side and the back side of the carrier material are fixed simultaneously. In this mode, both sides of the Carrier material heaters and corresponding cover ⁇ devices provided.
- FIG. 1 schematically shows a longitudinal section through a fixing station with a covering device in the manner of a roller blind
- FIG. 2 shows a cross section through the fixing station according to FIG. 1,
- FIG. 3 shows a band-shaped covering device
- FIG. 4 shows a covering device in the manner of a roller blind with strip-shaped slats
- FIG. 5 shows the power supplied to the heating device over the switch-on time in the cold start and warm start operating modes
- FIG. 6 shows a diagram to illustrate the regulation of the heating power
- FIG. 7 the tabular assignment of the power supplied depending on the operating state
- FIG. 8 shows a block diagram of the power control for the heat radiation source
- FIG. 9 schematically shows the arrangement of two heating devices on both sides of the carrier material
- FIG. 10 shows the division of the heating device into different zones
- Figure 11 schematically the control of different
- FIG. 12 shows an exemplary embodiment of a safety device with a spring accumulator
- FIG. 13 shows a status table for normal operation and when a fault occurs
- FIG. 14 shows a safety device with a locking element
- FIG. 15 shows a similar exemplary embodiment with a gas pressure spring
- FIG. 16 shows a status table for normal operation and in the event of a fault
- FIG. 17 shows an exemplary embodiment for a traction device guide with two tension springs
- FIG. 18 shows a simple arrangement of the traction device guide
- FIG. 19 shows an exemplary embodiment for a combination of pawl and holding magnet
- FIG. 20 shows an embodiment of the locking with a linear movement of the pawl
- Figure 21 shows a locking device with a
- Figure 22 shows an embodiment with a pivot lever and moving tension spring.
- Figure 1 shows a longitudinal section through a fixing station according to the invention. This fuser is used in a high-performance printer that prints a paper web 10 on both sides. In the illustration according to FIG. 1, only the upper part of the fixing station is shown, with which the upper side of the carrier material is subjected to thermal energy for fixing toner images. An identical device (not shown) is provided on the underside of the paper web 10, with which toner images are fixed on the underside.
- the fixing station contains a heat radiation source 12 which is designed as a film radiator. Such a film radiator has strips 50 ⁇ m thick, which assume a temperature of ⁇ 800 ° C when current is applied.
- foil heater has a low heat capacity and can therefore be heated up quickly and cools down just as quickly.
- Other heat radiation sources that can be used are a ceramic surface heater in which the heating coil is embedded in ceramic material. Quartz radiation sources in which the filament is installed in quartz tubes can also be used.
- Insulation 14 is provided around the heat radiation source 12 and has an opening at the bottom for the exit of the heat radiation.
- a cover device 16 is arranged between the heat radiation source 12 and the paper web 10 and can be moved into the beam path between the radiation source 12 and the paper web 10.
- the covering device 16 contains strip-shaped slats, which are assembled in the manner of a roller blind 16.
- the covering device 16 is flexible when viewed in the direction of movement of the paper web 10 and can be deflected at deflection rollers 18.
- One of the deflection rollers 18, for example the one shown at the bottom right in FIG. 1, is driven by a drive.
- the strip-shaped slats, which form the roller blind 16 are stretched between two rotating toothed belts 20 (only one toothed belt 20 can be seen in FIG. 1).
- the roller blind 16 By moving forward or backward supply of the toothed belt 20, the roller blind 16 can be moved into the beam path between the radiation source 12 and the paper web 10, so as to shield heat radiation from hitting the paper web 10.
- the length of the roller blind 16 is dimensioned such that in the closed state it covers the entire area of the heat radiation source 12 that emits radiation.
- two wire ropes or chains can also be used.
- the transport mechanism with toothed belt or wire rope drive is located on both sides outside the radiation area of the heat radiation source 12.
- the deflection device formed by the deflection rollers 18 is thus compact and requires little space.
- the covering device 16 is exposed to relatively large temperature differences. In the open state there is approximately room temperature - in the closed state the covering device 16 can reach a temperature of up to approximately 600 ° C. Due to the length changes due to the temperature differences, a tensioning device is provided on at least one deflection roller 18 (not shown). This tensioning device generates a constant tension in the toothed belt 20, so that the roller blind 16 is also tensioned.
- the tensioning device can be implemented, for example, by a belt tensioner with a permanently acting spring tension.
- the deflection rollers 18 are arranged axially adjustable.
- FIG. 2 shows a cross section of the arrangement according to FIG. 1, the roller blind 16 being in the closed state.
- the deflection rollers 18 are covered with the rotating toothed belt 20.
- the timing belt 20 on the right side has been omitted.
- Figure 3 shows an embodiment of the cover device, which is realized as a flexible band.
- FIG. 4 shows the strip-shaped slats which form the roller blind 16 in their entirety.
- the individual fins are made of high temperature resistant material, e.g. Steel sheet with a typical thickness of 0.1 to 0.3 mm.
- Materials in the form of ribbons or plates or fabrics with low heat conduction, such as e.g. Glass fibers, silicate fibers or Kermaik fiber paper are used, which guarantee the lowest possible thermal load on the paper web 10 in the closed state.
- the slats can be applied to a temperature-resistant, tear-resistant support grid.
- the aforementioned fiber products can also be used together with metals; the fiber products are then used for additional thermal insulation.
- the lamellae can be made of relatively inflexible material, for example ceramic or hollow steel profiles.
- Such hollow profiles which in turn can be composed of U-profiles, are preferably flushed with air for cooling.
- the movement of the covering device depends on the operating state of the paper web 10.
- the covering devices 16 shown in FIGS. 1 to 4 are flexible. In an alternative embodiment, however, it is also possible to use a rigid plate which, if necessary, can be moved into the beam path between the heat radiation source 12 and the carrier material 10 by a drive mechanism.
- the heat radiation source 12 has a preferred radiation temperature in the range from 500 ° C. to 800 ° C. Their maximum intensity of radiation is at a wavelength> 2 ⁇ m.
- start / stop processes for a variety of reasons, in which the paper transport has to be stopped for a certain time; for example in the event of an interruption in the electronic data flow, in the case of necessary cleaning processes in the printing unit or in the case of special paper transport movements.
- the heat radiation sources used have a relatively high time constant during heating, the paper web 10 has to be transported for a relatively long time until the fixing station is ready for use again in order to fix high quality toner images.
- Figure 5 shows a diagram of the typical heating behavior of a paper web in the steady state, i.e. a heat radiation source is operated continuously with nominal power NL, which results in a maximum paper temperature Tm, which is specified as 100%.
- This maximum paper temperature Tm is only reached after a time of 8 minutes.
- the paper temperature is then typically 180 ° C.
- the toner is only fixed above a fixing limit at a fixing temperature Tf. It is typically 80% of the maximum temperature Tm.
- the time to reach the fixation limit is typically 1 to 3 minutes if heating is started from room temperature.
- Such an operating state is referred to as a cold start. Such a time, except when the printer is switched on, is not acceptable for fast printing.
- FIG. 5 shows a curve labeled warm start, in which the energy supplied to the heat radiation source is set such that the paper heats up to approximately 45% of the achievable final temperature. If the fuser is to stop normal operation, the heat radiation Source source operated with nominal power NL, the fixing limit with fixing temperature Tf is reached within 10 seconds. At the same time, the power with which the heat radiation source is controlled in phases in which printing is not carried out is significantly reduced. For example, this power is only 40% of the nominal power NL.
- the heat radiation source is operated at nominal power NL until the fixation limit is reached. After reaching the fusing limit, the output is adjusted so that the temperature of the paper at the end of the fusing station, i.e. in areas of the paper that leave the fusing station is slightly above the fusing temperature Tf.
- This type of control to the initial paper temperature makes you largely independent of the material used, in particular this procedure is independent of the paper weight.
- Figure 6 shows in a diagram similar to that of Figure 5, the paper temperature over time. Due to the preheating, the fixation limit is quickly exceeded. The control then ensures that the paper temperature is slightly above the fusing limit when leaving the fusing station.
- Figure 7 shows the selected power for the heat radiation source depending on the operating state.
- the power supplied to the heat radiation source is approximately 80% of the nominal power NL.
- the output is about 60 to 80% of the nominal output NL.
- the output is 30 to 60% of the nominal output NL.
- the output is less than 30% of the nominal output NL.
- the power supplied is 100% of the nominal power NL.
- Figure 8 shows schematically in a block diagram the control of the heat radiation source, which has different power levels 1 ... N. These performance levels depend on the specified operating states 1 ... N of the printer.
- the temperature of the paper web at the exit of the fusing station serves as the control variable.
- FIG. 9 schematically shows an arrangement for a fixing station, as is used in duplex printing.
- the paper web 10 is irradiated by an upper heat radiation source 12a and by a lower heat radiation source 12b in order to fix toner images on both sides of the paper web 10.
- Each heat radiation source contains several zones ZI to Z6 (see FIG. 10), each of which can be controlled separately.
- the various zones ZI to Z6 are implemented using heating foils, the connections of which are led out separately.
- a fusing station must be able to process paper webs of different widths. For a high fixing quality, it is necessary that the irradiance is relatively uniform over the entire width of the paper web, so that a uniform temperature is established. In the case of a heat radiation source, the radiation intensity drops towards the edge. On the other hand, in the arrangement according to FIGS. 1 and 2 and in opposing heating zones without a paper web, overheating can occur since no thermal energy is dissipated through the paper web. In such a case, overheating can occur at the edge of the paper web, which results in poor quality.
- zones ZI to Z4 in which the paper web 10 faces these zones, are combined. Each opposite zone is then controlled with the same heating output. If the format width increases, individual zones, for example zone Z5 or zones Z5 and Z6, are switched on.
- FIG. 11 shows a circuit arrangement for controlling the different zones ZI to Z6 of the heat radiation sources 12a, 12b.
- opposing zones ZI to Z6 are connected in parallel.
- the energy supply can take place by means of a pulse packet control or a phase control.
- zones ZI to Z6 are supplied with a number of current pulses per unit of time depending on the power to be set.
- a regulation of the temperature is outlined in FIG.
- a temperature tensor 20 detects the surface temperature of the paper web 10, which extends along the zones ZI to Z4.
- the signal from the sensor 20 reaches a control unit 22 which supplies the combined zones ZI, Z2, Z3 and Z4 with current in such a way that a constant temperature is established.
- a second sensor 24 detects the temperature in an area in which no paper web 10 faces zones Z5, Z6.
- the signal from the sensor 24 is fed to a controller 26 which supplies the combined zones Z5, Z6 with electrical energy such that a lower temperature is reached in these zones Z5, Z6 provides as in the zones ZI to Z4, which emit radiation energy on the paper web 10. In this way, overheating is avoided in the edge region of the paper web 10 and a uniform temperature profile is nevertheless achieved over the width of the paper web 10.
- a switching device U with several switches Ul to U6 determines how the different zones ZI to Z6 are combined. Depending on the width of the paper web 10, a switch is made between the positions shown, so that the respective zone ZI to Z6 is controlled either by the controller 22 or by the controller 26.
- the switches U1 to U6 can be set, for example, using suitable operating state software. In this way, the entire fusing station with two heat radiation sources 12a, 12b divided into zones can be controlled by two control loops. A further simplification is obtained if there is direct control of the heating power supplied in the area without paper web 10. The sensor 24 can then be omitted.
- the heat radiation sources used are relatively slow, so that if the carrier material stops and the energy supply to the heat radiation source is switched off, the carrier material can nevertheless overheat. This overheating can be so severe that the carrier material, for example paper, ignites. It must therefore be ensured that the cover device still functions reliably even if the drive motor fails, for example in the event of a power failure, in order to rule out a dangerous situation.
- An embodiment of the invention is characterized in that the cover device is connected to a safety device that contains an energy store, and that if the drive for the cover device fails, energy is withdrawn from the energy store with which the cover device through the safety device device is moved into the beam path between the radiation source and the carrier material.
- An electrical, pneumatic, magnetic or mechanical memory can be used as the energy store. Mechanical spring energy is preferably stored in the energy store, ie it contains a linear spring, a torsion spring or a gas pressure spring.
- FIG. 1 A simple exemplary embodiment for a safety device is shown in FIG.
- the entire fixing station 30 contains two heating devices 32a and 32b, which heat the paper web 10 on both sides.
- the respective covering devices 16a, 16b are moved by toothed belts 20a, 20b.
- the two toothed belts 20a, 20b are driven via drive wheels and axles by a belt or chain 34 which is placed around a drive shaft 36.
- a motor (not shown) acts on the drive shaft 36.
- a magnetic coupling (not shown) is connected between the drive shaft 36 and the motor, which decouples the motor shaft if the motor fails.
- a wire cable 38 is also connected to the drive shaft 36 as a traction means, which in turn is connected to a linear spring 40.
- FIGS. 14 and 15 show a further exemplary embodiment in which a locking device is used.
- this locking device it is achieved that the spring accumulator is not tensioned or relaxed with every movement of the cover device.
- the spring accumulator once loaded, is locked in the opened state. This lock is released in the event of danger.
- FIG. 14 shows a further development of the exemplary embodiment according to FIG. 13.
- the same parts are labeled identically.
- the spring 40 is connected to the drive shaft 36 via the traction means 38, for example a wire rope, a chain or a toothed belt.
- a traction means tensioner 44 is provided which, under spring load, tensions the traction means 38 during normal operation when the covering device 16a, 16b is moved back and forth.
- a pawl 46 engages in a pawl 48.
- the pawl 46 is actuated by an electrical holding magnet 50.
- a damper 52 is connected, which dampens the spring movement.
- the spring 40 When the safety device is in operation, the spring 40 is initially wound up once with the aid of the drive shaft 36 and the traction means 38, if necessary at a reduced engine speed.
- the electrical holding magnet 50 holds the pawl 46 in the state shown when the operating voltage is present.
- the locking hook 48 engages in the pawl 46.
- the stroke of the spring 40 is matched to the movement of the covering devices 16a, 16b.
- the motor In the event of a fault, the motor is automatically decoupled by the magnetic coupling so that it does not hinder further movement by the safety device. If there is no Operating voltage switches off the electrical holding magnet 50 and releases the pawl 46. Due to the spring energy stored in the spring 40, the drive shaft 36 is moved in order to bring the covering devices 16a, 16b into the closed state.
- the damper 52 is connected directly in parallel with the spring 40. This dampens the closing movement evenly over the entire actuation path. This damping is necessary in particular so that the safety device does not cause a hard blow even when the cover device 16a, 16b is half open.
- a gas pressure spring is advantageously used, which represents a combination of spring accumulator and damping.
- Another advantage of using gas pressure springs is that there is no sudden failure. While normal mechanical springs can suddenly fail due to breakage even when correctly designed, a gas pressure spring gradually loses internal pressure towards the end of its service life due to wear on the seals. By checking the force required for winding or locking, the gas pressure spring can be used until shortly before a minimum internal pressure is reached and then a necessary replacement can be displayed on the control panel on the printer.
- FIG. 15 shows an embodiment using a gas pressure spring 54.
- the movable end of the gas pressure spring 54 is connected to a deflection roller 56, via which the traction means 38 is deflected.
- the covering device 16 is closed and the gas pressure spring 54 is relaxed.
- a rope is provided as the traction means 38, which is wound onto the drive shaft 36.
- the drive power of the motor only has to be designed for the normal actuation of the covering devices 16a, 16b, since the gas pressure spring 54 only has to be tensioned rarely and therefore a reduced winding speed is possible.
- FIG. 16 shows a status table for normal operation and when a fault occurs when using a lockable safety retraction.
- FIG. 17 shows an example of a traction device guide with two tension springs 60, 62 which act on the ends of the traction device 38.
- FIG. 17 shows the states "gas pressure spring 54 relaxed” and “cover closed”, i.e. before opening the gas pressure spring 54 or after actuation of the gas pressure spring 54 in the event of a fault.
- the entire traction means 38 is moved back and forth between the two stops 63, 64 when the cover devices 16a, 16b are actuated.
- the stop 63 defines the position "cover open”; the stop 64 defines the position "cover closed”.
- the stops shown also form the end stops for the movement of the covering devices 16a, 16b via the positive connection to the covering devices 16a, 16b.
- FIG. 18 shows a further simplification of the arrangement of the traction means 38.
- only one spring 70 with stops (where are they in the figure?) Is provided.
- the spring 70 is moved back and forth between the stops when the gas pressure spring 54 is pulled up with the traction means 38.
- the translation of the relatively short stroke of the gas pressure spring 54 to the actuation path for the covering device 16a, 16b takes place via the diameter ratio of the drive wheels 72 and 36.
- a gas pressure spring 54 with a relatively short stroke additional installation space is saved. Due to the symmetrical guidance of the traction means, for example a chain, it is possible to guide the deflection roller 56, which is moved by the gas pressure spring 54, almost free of lateral forces.
- FIG. 19 shows the construction of a locking mechanism in combination with the gas pressure spring 54.
- the deflecting roller 56 has a transverse bolt 74 which is guided in a longitudinal guide 76.
- the cross bolt 74 engages in a recess 78 of the pawl 46.
- the pawl 46 has a further recess 80 into which a locking pin 82 of the holding magnet 50 engages.
- the pawl 46 can be rotated about the axis of rotation 84.
- the holding magnet 50 is supplied with operating voltage, the pawl 46 holds the cross bolt 74.
- the gas pressure spring 54 remains in its tensioned state.
- the holding magnet 50 releases the locking pin 82, so that the pawl 46 can rotate about the axis of rotation 84.
- the cross pin 74 is released from the recess 78 and the deflection roller 56 moves to the right in FIG. 19 and drives the traction means.
- FIG. 20 shows another embodiment of the locking, the pawl 46 executing a linear, vertical movement along elongated holes 86.
- the recesses 80, 78 contain guide bevels 88, 90 which, in the locked state, define the balance of forces.
- FIG. 21 shows a further exemplary embodiment of the locking device with a pivot lever 94 which contains an elongated hole guide 96.
- the holding magnet 50 holds the pivot lever 94, to which an anchor plate 92 is attached.
- the cross bolt 74 of the deflection roller 56 in this case a deflection pinion, is guided both in the longitudinal guide 76 and in the elongated hole guide 96.
- the pivot lever 94 rotates upwards until the elongated hole guide 96 and the longitudinal guide 76 overlap.
- the cross bolt 74 can then in both guides 76, 96 move.
- the electrical holding magnet 50 requires only a very small holding force.
- FIG. 22 shows an exemplary embodiment of a safety device with locking by means of a swivel lever 94.
- a chain is provided as the traction means 38, which chain is placed over the pinion on the drive shaft 36.
- a chain tension spring 100 with damping elements 102 is moved between two end stops 104.
- the lever ratio of the holding magnet 50 to the gas spring 54 is determined by the ratio of the distance a between the pivot lever pivot point 106 and the axis 108 of the gas pressure spring 54 to the distance b between the pivot lever pivot point 106 and the axis 110 of the holding magnet 50.
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 |
---|---|---|---|
DE19827210 | 1998-06-18 | ||
DE19827210A DE19827210C1 (en) | 1998-06-18 | 1998-06-18 | Fixing station for fixing toner images on a carrier material with a movable cover device |
PCT/EP1999/004191 WO1999066372A1 (en) | 1998-06-18 | 1999-06-17 | Fixing station for fixing toner images on a supporting material with a mobile covering device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1088258A1 true EP1088258A1 (en) | 2001-04-04 |
EP1088258B1 EP1088258B1 (en) | 2003-11-19 |
Family
ID=7871313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99929252A Expired - Lifetime EP1088258B1 (en) | 1998-06-18 | 1999-06-17 | Fixing station for fixing toner images on a supporting material with a mobile covering device |
Country Status (4)
Country | Link |
---|---|
US (1) | US6449458B1 (en) |
EP (1) | EP1088258B1 (en) |
DE (2) | DE19827210C1 (en) |
WO (1) | WO1999066372A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10037464A1 (en) | 2000-08-01 | 2002-03-07 | Oce Printing Systems Gmbh | Apparatus and method for fixing a toner image using a directional stream of solvent vapor |
DE10038896B4 (en) * | 2000-08-09 | 2004-09-30 | Advanced Photonics Technologies Ag | Method and device for the thermal fixing of laser prints |
DE10064561A1 (en) * | 2000-12-22 | 2002-06-27 | Nexpress Solutions Llc | Fixing device for fixing toner material |
DE10213498C1 (en) * | 2002-03-26 | 2003-04-24 | Oce Printing Systems Gmbh | Safety device for cover movable between recording medium, heat radiator in fixing station of electrophotographic printer or copier has gas pressure spring in guide channel next to pulley |
DE10328858B3 (en) | 2003-06-26 | 2004-08-05 | OCé PRINTING SYSTEMS GMBH | Toner image fixing station for electrophotographic copier or printer using heating module with controlled detonation elements |
DE10333106B4 (en) * | 2003-07-21 | 2006-10-26 | OCé PRINTING SYSTEMS GMBH | Safety device for preventing the spread of fire from a fixing chamber of a fuser in an electrographic printer or copier |
DE10338516B3 (en) * | 2003-08-21 | 2005-04-28 | Oce Printing Systems Gmbh | Fuser and method for uniformly fixing toner images on a substrate by means of a movable cover |
DE102004040777B4 (en) * | 2004-08-23 | 2008-09-25 | OCé PRINTING SYSTEMS GMBH | Method for determining the heat power requirement to be applied by a heat source of a fixing station for fixing toner images on a printing substrate in the case of an electrographic printing or copying device |
DE102006035829A1 (en) | 2006-08-01 | 2008-02-21 | OCé PRINTING SYSTEMS GMBH | Apparatus and method for detecting a fire in a fuser unit of a printer or copier |
DE102007002817B4 (en) | 2007-01-18 | 2011-06-01 | OCé PRINTING SYSTEMS GMBH | Device for detecting a fire in a fixing module of an electrographic printing or copying device |
EP2276634B1 (en) * | 2008-04-18 | 2012-03-21 | Hewlett-Packard Development Company, L.P. | Printing device and control method |
US7742733B2 (en) * | 2008-06-27 | 2010-06-22 | Xerox Corporation | Fuser assemblies, xerographic apparatuses and methods of fusing toner on media |
DE102008063955B4 (en) | 2008-12-19 | 2012-02-23 | OCé PRINTING SYSTEMS GMBH | Method for controlling and controlling an endless belt in a printer or copier while pivoting the belt |
DE102009034227A1 (en) | 2009-07-22 | 2011-01-27 | OCé PRINTING SYSTEMS GMBH | Method and device for controlling a property of a printed image printed on a carrier material |
US8422930B2 (en) * | 2010-03-25 | 2013-04-16 | Eastman Kodak Company | Safe radiant toner heating apparatus with membrane |
TWI505942B (en) * | 2011-12-16 | 2015-11-01 | Kinpo Elect Inc | Multifunction printer |
JP7331503B2 (en) * | 2019-07-02 | 2023-08-23 | 富士フイルムビジネスイノベーション株式会社 | image forming device |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5217028A (en) | 1975-07-30 | 1977-02-08 | Konishiroku Photo Ind Co Ltd | Fixing device for the copying machine |
JPS5354034A (en) * | 1976-10-27 | 1978-05-17 | Fujitsu Ltd | Heat fixing unit |
DE2701862C3 (en) * | 1977-01-18 | 1981-05-14 | Tokyo Shibaura Electric Co., Ltd., Kawasaki, Kanagawa | Electrically controlled fire protection device for the fixing device of an electro-photographic copier |
JPS53109632A (en) * | 1977-03-07 | 1978-09-25 | Mitsubishi Electric Corp | Fixing method of electrostatic latent image |
JPS5627183A (en) * | 1979-08-10 | 1981-03-16 | Ricoh Co Ltd | Safety device in radiant fixing unit of copying |
JPS6014268A (en) * | 1983-07-05 | 1985-01-24 | Ricoh Co Ltd | Fixing device |
JPS6255685A (en) * | 1985-09-04 | 1987-03-11 | Olympus Optical Co Ltd | Fixing device |
JPH0534307A (en) * | 1991-08-02 | 1993-02-09 | Fujikura Ltd | Oxygen sensor |
JPH063984A (en) * | 1992-06-23 | 1994-01-14 | Toray Ind Inc | Fixing unit |
EP0629930B1 (en) * | 1993-06-18 | 1998-05-27 | Xeikon Nv | Electrostatographic printer with image-fixing station |
JPH0934307A (en) * | 1995-07-21 | 1997-02-07 | Hitachi Koki Co Ltd | Fixing device |
JPH1039663A (en) * | 1996-07-26 | 1998-02-13 | Matsushita Electric Ind Co Ltd | Image forming device |
JP3384707B2 (en) * | 1997-03-19 | 2003-03-10 | 富士通株式会社 | Image forming device |
-
1998
- 1998-06-18 DE DE19827210A patent/DE19827210C1/en not_active Expired - Fee Related
-
1999
- 1999-06-17 WO PCT/EP1999/004191 patent/WO1999066372A1/en active IP Right Grant
- 1999-06-17 DE DE59907807T patent/DE59907807D1/en not_active Expired - Lifetime
- 1999-06-17 US US09/719,939 patent/US6449458B1/en not_active Expired - Fee Related
- 1999-06-17 EP EP99929252A patent/EP1088258B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9966372A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19827210C1 (en) | 1999-12-16 |
DE59907807D1 (en) | 2003-12-24 |
EP1088258B1 (en) | 2003-11-19 |
WO1999066372A1 (en) | 1999-12-23 |
US6449458B1 (en) | 2002-09-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1088258B1 (en) | Fixing station for fixing toner images on a supporting material with a mobile covering device | |
DE69504395T2 (en) | Printing machine for simultaneous two-sided printing | |
EP1217458B1 (en) | Method for controlling gloss of a toner image and digital image forming apparatus | |
DE3421925C2 (en) | ||
DE3838021A1 (en) | DUPLEX REPRODUCTION DEVICE | |
DE3811414A1 (en) | FIXING DEVICE FOR TONER IMAGES | |
DE10064552A1 (en) | Method and machine for printing and / or coating a substrate | |
DE69013804T2 (en) | Imaging device. | |
DE10139775B4 (en) | Printer for applying a print image to an endless web | |
EP1429910B1 (en) | Method and device for producing an intermediate supporting strip by welding and involving a subsequent heat treatment | |
DE3424778A1 (en) | PRINTING DEVICE | |
DE10064561A1 (en) | Fixing device for fixing toner material | |
DE19811031A1 (en) | Method of producing a print, especially a multicolor proof, using laser-induced thermal transfer | |
EP1217463B1 (en) | Digital printing or copying machine including a fixing device | |
DE19827211C1 (en) | Image fixing station for electrographic printer, copier | |
EP0551288B1 (en) | Thermo-fixing station with belt conveyor | |
DE20121616U1 (en) | Feeding device of an endless web for a printing or copying system with a modular structure and monitoring device | |
EP0871928A2 (en) | Arrangement for turning or displacing a web of continuous recording material | |
EP0772529B1 (en) | Transfer printing station for treating in parallel two recording medium webs | |
WO1994009410A1 (en) | Thermofixing arrangement for printing or copying machines with a low temperature preheating saddle | |
EP0771436B1 (en) | Multi-functional printing device for printing strip substrates | |
EP0514377B1 (en) | Transport device for recording media in printers and photocopiers | |
DE10143988A1 (en) | Digital printing or copying machine | |
DE19719118B4 (en) | Electrophotographic device system | |
DE102009024912B4 (en) | Method for changing the temperature of a substrate web in a printer or copier |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20010111 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
RTI1 | Title (correction) |
Free format text: FIXING STATION FOR FIXING TONER IMAGES ON A SUPPORTING MATERIAL WITH A MOBILE COVERING DEVICE |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 59907807 Country of ref document: DE Date of ref document: 20031224 Kind code of ref document: P |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20040209 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040630 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20040820 |
|
BERE | Be: lapsed |
Owner name: *OCE PRINTING SYSTEMS G.M.B.H. Effective date: 20040630 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20090618 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20090528 Year of fee payment: 11 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20100617 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20110228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100617 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 59907807 Country of ref document: DE Representative=s name: PATENTANWAELTE SCHAUMBURG, THOENES, THURN, LAN, DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 59907807 Country of ref document: DE Representative=s name: PATENTANWAELTE SCHAUMBURG, THOENES, THURN, LAN, DE Effective date: 20130820 Ref country code: DE Ref legal event code: R081 Ref document number: 59907807 Country of ref document: DE Owner name: OCE PRINTING SYSTEMS GMBH & CO. KG, DE Free format text: FORMER OWNER: OCE PRINTING SYSTEMS GMBH, 85586 POING, DE Effective date: 20130820 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20130830 Year of fee payment: 15 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59907807 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59907807 Country of ref document: DE Effective date: 20150101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150101 |