EP1159741A2 - Einrichtung zum übertragen eines tonerbildes von einem tonerträgerband auf ein trägermaterial unter beibehaltung einer konstanten bandspannung - Google Patents
Einrichtung zum übertragen eines tonerbildes von einem tonerträgerband auf ein trägermaterial unter beibehaltung einer konstanten bandspannungInfo
- Publication number
- EP1159741A2 EP1159741A2 EP00916924A EP00916924A EP1159741A2 EP 1159741 A2 EP1159741 A2 EP 1159741A2 EP 00916924 A EP00916924 A EP 00916924A EP 00916924 A EP00916924 A EP 00916924A EP 1159741 A2 EP1159741 A2 EP 1159741A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- transfer
- rollers
- toner
- rotation
- 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
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
Definitions
- the invention relates to a device for transferring at least one toner image from a toner carrier tape to a carrier material, wherein the toner carrier tape carries the toner image to be transferred and has a predetermined band tension, and wherein the toner carrier band is arranged in the transfer printing area in a first operating state near the carrier material transfer the toner image, and is arranged in a second operating state in the transfer printing area by a predetermined distance from the carrier material in order to prevent transfer of the toner image.
- WO 98/39691 a printing or copying device for performance-adapted monochrome and / or colored printing on one or both sides of a recording medium.
- the device uses a transfer belt on which toner images of different colors are superimposed on one another in a first operating state. The total toner image thus created by superimposition is then transferred to the recording medium.
- the toner carrier tape is removed from the carrier material, as a result of which transmission of the partial toner images is prevented.
- the transfer belt is arranged near the recording medium in order to transfer the total toner image.
- the transfer belt at the transfer printing point is therefore interrupted by the carrier Removed material and moved back to the carrier material during further printing.
- this back and forth movement must be smooth, since otherwise a simultaneous transfer printing between a photoconductor belt and the transfer belt for transferring a toner image is impaired, for example the toner image is blurred.
- Conventional devices with belt tensioners do not achieve the required smoothness; rather, there are changes in the belt tension in the toner carrier tape, which lead to a lower print quality.
- a roller that can be pivoted via a mechanism serves to selectively bring a transfer belt into contact with a photoconductor drum.
- DE-A-41 39 409 describes a further imaging device with an electrostatic transfer printing device.
- a conveyor belt guided over at least two rollers guides a print medium past a photoconductor drum.
- a latent print image is transferred from the photoconductor drum to the print medium.
- the belt tension in the toner carrier belt becomes the same in both the first and the second operating state kept large. In this way, there is no change in length in the toner carrier tape and tape tension peaks are also avoided. If a toner image is re-printed onto the toner carrier belt at the same time in a second transfer printing area, the ambient conditions in this transfer printing area remain constant due to the constant tape tension and a high print quality can be achieved.
- the belt tension in the toner carrier belt is advantageously of the same magnitude even in the transition phase from the first operating state to the second operating state and vice versa. This means that the transport movement of the belt can also be maintained during this transition phase, without there being any fear of a loss of quality when a toner image is simultaneously transferred onto the toner carrier belt.
- a transfer belt is preferably provided as the toner carrier belt, onto which a toner image is transferred in a transfer printing process by a toner image forming device, for example a photoconductor drum or a photoconductor belt.
- a toner image forming device for example a photoconductor drum or a photoconductor belt.
- the toner carrier tape can also be a photoconductor tape on which a toner image is generated for the first time.
- FIG. 1 shows a coupling lever movement mechanism in a schematic illustration
- FIG. 2 shows the coupling lever movement mechanism in a simplified perspective illustration
- FIG. 3 shows a movement mechanism with control cams
- FIG. 4 shows the control cams according to FIG. 3 in a different movement phase
- FIG. 1 shows a first embodiment of the invention in a simplified schematic representation.
- a toner carrier tape designed as a transfer tape 10 is guided around rollers of a tape drive, which is generally designated by 12.
- a tape drive which is generally designated by 12.
- FIG. 1 only a part of the tape drive 12 and the transfer tape 10 is drawn.
- Transfer belt 10 is guided around a roller device 13 with a single transfer roller 14, the axis of rotation 16 of which with the aid of a longitudinal guide 18 and a drive device 20 can perform reciprocating movements approximately perpendicular to a carrier material 22, generally single sheets or band material made of paper.
- the drive device 20 contains, for example, a switching eccentric 24, the rotation of which causes the axis of rotation 16 to move back and forth in the direction of the arrow P1.
- the tape drive 12 includes two stationary rolls 26, '28, whose axes of rotation 30, 32 are anchored fixedly on the frame of the tape drive 12th Between the transfer roller 16 and the stationary rollers 26, 28 there are compensating rollers 34, 36, the axes of rotation 38, 40 of which can be moved and can be moved, for example, in the direction of the arrows P2 and P3.
- a movable cleaning roller 42 is arranged between the transfer roller 14 and the compensating roller 34, the axis of rotation 44 of which is rotated by a further drive device 46 with a switching eccentric in the direction of the arrow P4. and is movable. During this reciprocating movement, the portable cleaning roller 42 is brought into or out of engagement with a cleaning roller 48 with the transfer belt 10. This cleaning roller 48 serves to remove residual toner material which is still present on the transfer belt 10 after the transfer printing.
- the axis of rotation 32 of the fixed roller 28 and the axis of rotation 40 of the movable roller 36 are rigid
- Coupling element 50 which can execute pivoting movements on the axes of rotation 32, 40, is connected to one another.
- This rigid coupling element 50 serves to keep the distance between the axes of rotation 32 and 40 constant in all operating phases.
- a rigid, pivotable coupling element 52 is arranged between the axis of rotation 40 of the movable roller 36 and the axis of rotation 16 of the transfer roller 14.
- a further rigid coupling element 54 is provided between the axis of rotation 16 of the transfer roller 14 and the axis of rotation 44 of the cleaning roller 42.
- the axis of rotation 44 of the cleaning roller 42 and the axis of rotation 38 of the movable roller 34 is connected via a coupling element 56.
- the axis of rotation 38 of the movable roller 34 is also connected to the axis of rotation 30 of the stationary roller 26 via a rigid, pivotable coupling element 58.
- the coupling elements 50, 52, 54, 56, 68 may have 'different length.
- An essential feature of the invention is that the diameter of the rollers 26, 28, 34, 36, 42 and 14 are the same size.
- the axes of rotation 16, 30, 32, 38, 40 and 44 are arranged parallel to one another and are perpendicular to the paper plane in FIG. 1.
- the transfer belt 10 is generally made of plastic material. As a result of, for example, changes in humidity or temperature, there may be a slight change in the length of the transfer belt 10, for example in the mm range. To compensate for this change in length, a separate the first tensioning roller (not shown) may be provided.
- the roller 28 can also take over the function of a tension roller and have a deflection of approximately 1 mm. Nevertheless, the roller 28 can then still be regarded as stationary, since this deflection at the transfer printing location or the transfer printing locations does not cause a change in location of the toner image points to be transferred with respect to the carrier material 22 or a photoconductor belt.
- Figure 1 explains.
- the transfer belt 10 is held in its immediate movement in the direction of the arrow PO in the immediate vicinity of the carrier material 22 or is in contact with this carrier material 22.
- toner images which are present on the transfer belt 10 in a relatively loose, not yet fixed form can be re-printed on the carrier material 22.
- a second operating state is set in which the transfer roller 14 is moved upward in the direction of the arrow P1.
- the transfer roller 14 is raised, the movement is transmitted to the movable rollers 34, 36 and 42 by means of the coupling elements 50, 52, 54, 56 and 58.
- the stationary rollers 26 and 28 do not move.
- the coupling elements 50, 52, 54, 56, 58 are, as mentioned, pivotably mounted on the axes of rotation 32, 40, 16, 44, 38, 30.
- the movable rollers 36, 42, 34 are mainly deflected in the direction of the arrows P2 and P3, since the cleaning roller 42 is locked and does not deflect in the direction of the arrow P4. Since the coupling levers 50, 52, 54, 56, 58 run exactly parallel to the corresponding sections of the transfer belt 10, and the diameters of the associated rollers 28, 36, 14, 42, 34, 26 are the same size, there is no change in length in the transfer belt 10 , regardless of how large is the stroke by which the transfer roller 14 is raised by the drive device 20. This means that the Belt tension in the transfer belt 10 is independent of this stroke and thus remains constant. A voltage peak or an additional force does not occur when the transfer roller 14 moves. The belt tension thus remains constant even in the transition phase between the two operating states of the transfer roller 14.
- the cleaning roller 42 can be moved back and forth in the direction of the arrow P4 by the drive device 46.
- the coupling levers 58, 56 and 54 then perform compensating movements which ensure that the transfer belt does not become loose and thus the belt tension within the transfer belt 10 remains unchanged.
- the arrangement selected in FIG. 1 achieves several advantages.
- the arrangement of the coupling levers 50, 52, 54, 56, 58 ensures an exact assignment of the compensating rollers 36 and 34 to the transfer roller 14 at any time during the movement of the transfer roller 14. No mechanically complicated parts are required; the mechanism of action of the arrangement is clear.
- the coupling levers 50, 52, 54, 56, 58 take over the drive and the guidance of the compensating rollers 36, 34. Only the transfer roller 14 and the cleaning roller 42 have to be moved by their own drive.
- the coupling lever movement mechanism enables the inclusion of a further length-neutral pivoting movement at another point on the transfer belt 10, as shown by the example of the movable cleaning roller 42, which is driven separately by a drive 46.
- FIG. 2 shows a perspective illustration of the movement mechanism according to FIG. 1, the same parts being labeled identically.
- the coupling levers 54, 56 are combined to form a single coupling lever 55. It can be seen in FIG. 2 that the coupling lever is open are arranged on both sides of the rollers.
- the arrangement in FIG. 2 has corresponding coupling levers 50 ⁇ 52 ⁇ 55 x and 58 ⁇ arranged at the rear.
- FIG. 3 shows another embodiment in which control cams are used. Parts that correspond to previous exemplary embodiments are identified identically.
- the transfer belt 10 is moved in the direction of the arrow PO by the tape drive 12.
- the toner image applied to a photoconductor belt 62 is transferred to the transfer belt 10 at a first transfer printing point 60.
- the transfer belt 10 is deflected at a deflecting roller 64 and is guided past a first compensation roller 66 'which is movable in the drawn arrow.
- the transfer belt 10 then arrives in a second transfer printing area 68, in which the toner image located on the transfer belt 10 or the total color toner image collected is transferred to the carrier material 22.
- the roller device 13 is arranged in the transfer printing area 68 and can be moved back and forth in the direction perpendicular to the carrier material 22.
- the roller device 13 has two transfer rollers 70, 72 which can be moved in the direction of the arrows.
- the transfer belt 10 is then guided past a second compensation roller 74, which can be moved in the direction of the arrows shown.
- the tape drive 12 contains a second deflection roller 76, ah, the transfer belt 10 is deflected.
- the deflection rollers 70, 72 and the compensation rollers 66, 74 are driven by control cams 78, 80, as can be seen more precisely on the right in FIG. 3 with the aid of the control cam 78.
- the control cam 78 has an elliptical control surface 82 and is rotatable about an axis of rotation 84. In the state shown, the transfer roller 70 is deflected downward at most, while the compensation roller 66 is deflected upward to the left. When the control cam 78 rotates clockwise, the compensation roller 66 is moved due to the elliptical control surface 82 deflected to the right in Figure 3, while the transfer roller 70 moves upward with appropriate bias. If the compensation roller 66 were to be stationary, the two rollers would loosen when the transfer roller 70 moved upward
- control surface 82 of the control cam 78 is now curved so that the length difference resulting from the upward movement of the transfer roller 70 is exactly compensated for by the movement of the compensation roller 66 to the right.
- the resulting control surface 82 does not necessarily have to be elliptical, but can also take a different curve shape.
- Figure 4 shows the situation when the control cams 78, 80 have rotated 90 ° clockwise.
- the transfer roller 70 and the compensation roller 66 have moved from the position shown in broken lines on the right in FIG. 4 to the position shown in solid lines.
- Figure 4 on the left it can be seen that in the state shown the transfer belt 10 is lifted off the carrier material 22. In this state, a transfer of toner images to the carrier material 22 is prevented;
- the transfer belt 10 and the carrier material 22 can have different speeds, which is advantageous for starting the printing operation and for stopping the printing operation, since a relative speed can occur in these operating phases.
- the control surface 82 of the control cam 78 is preferably curved so that a length compensation for the transfer belt 10 is carried out so that the length difference of the transfer belt 10 due to the back and forth movement of the transfer belt 70, 72 and the compensation rollers 66, 74 in the entire phase of movement Transfer rollers 70, 72 is compensated. In this case, there are no changes in tape tension and changes in length in the transfer belt 10, so that transfer printing can continue at the transfer location 60 without blurring effects.
- the two control cams 78, 80 are rotated symmetrically, which also results in a symmetrical movement sequence and the two transfer rollers 70, 72 are pivoted in parallel.
- This embodiment according to Figures 3 and 4 can be modified in many ways.
- the control cams 78, 80 can be rotated asymmetrically, as a result of which different, asymmetrical swivel courses are achieved. For the actuation of the roller pair of transfer roller 70 and associated ones
- Compensation roller 66 and transfer roller of the roller pair 72 and compensating roll 74 may each have a common control cam 78 or 80 or it can also separate 'control cams are arranged on common or separate axes.
- FIG. 5 shows a further embodiment of the invention, in which spring-loaded tensioning rollers are used.
- the tape drive 12 which transports the transfer belt 10, has fixed deflecting rollers 90, 92, 94, two tensioning rollers 96, 98 and a reciprocating roller device 13 consisting of two transfer rollers 100, 102.
- the tensioning rollers 96 and 98 are each by means of swivel arms 104 , 106 pivotally attached to a rigid axis of rotation 108 at the end of a guide rod 110.
- the axes of rotation 112, 114 of the tensioning rollers 96, 98 are also pivotally mounted on coupling pins 116, 118 on a pivot 120, which is fastened to a sliding piece 122.
- the sliding piece 122 is movable along the guide rod 110.
- the roller device 13 with the two transfer rollers 100, 102 can likewise be moved along the guide rod 110.
- the guide rod is fixed rigidly with respect to the tape drive 12 at the upper end.
- a compression spring 124 creates a pretension on the sliding piece 122. If the roller device 13 is now moved upwards along the center line 126, a belt slack would occur in the case of fixed belt rollers 96, 98 Transfer ribbon 10 result.
- the compression spring 124 presses the sliding piece 122 downward along the guide rod 110, the coupling rods 116, 118 symmetrically moving the tensioning rollers 96, 98 outward along a circular path which is defined by the swivel arms 104, 106.
- the transfer ribbon does not stretch itself, the actual ribbon length cannot change. It follows from this that the individual image points on the transfer belt 10 move along the center line 126 and thus perpendicular to the carrier material 22 at the transfer printing point 68 '. This prevents blurring of a toner image. When swiveling and swiveling the roller device 13 against the carrier material 22, there can be no blurring of the printed image. In order to achieve symmetrical behavior, the two deflecting rollers 92, 94 must be arranged symmetrically to the center line 126. Due to the spring deflection, the belt tension in the pressure transfer belt 10 can be slightly different in both operating modes; however, it is ensured that the length of the transfer belt remains the same in both operating states with the roller device 13 pivoted in and out.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19910613 | 1999-03-10 | ||
DE19910613 | 1999-03-10 | ||
PCT/EP2000/002136 WO2000054266A2 (de) | 1999-03-10 | 2000-03-10 | Einrichtung zum übertragen eines tonerbildes von einem tonerträgerband auf ein trägermaterial unter beibehaltung einer konstanten bandspannung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1159741A2 true EP1159741A2 (de) | 2001-12-05 |
EP1159741B1 EP1159741B1 (de) | 2007-06-27 |
Family
ID=7900435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00916924A Expired - Lifetime EP1159741B1 (de) | 1999-03-10 | 2000-03-10 | Einrichtung zum übertragen eines tonerbildes von einem tonerträgerband auf ein trägermaterial unter beibehaltung einer konstanten bandspannung |
Country Status (5)
Country | Link |
---|---|
US (1) | US6606475B1 (de) |
EP (1) | EP1159741B1 (de) |
JP (1) | JP4430243B2 (de) |
DE (1) | DE50014443D1 (de) |
WO (1) | WO2000054266A2 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10160606B4 (de) | 2001-12-10 | 2006-02-02 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Führen eines bandförmigen endlosen Trägermaterials in einem elektrografischen Drucker oder Kopierer |
DE10338497B4 (de) | 2003-08-21 | 2005-09-29 | OCé PRINTING SYSTEMS GMBH | Verfahren und Anordnung zum Erzeugen von positionsgenauen Druckbildern auf einem Trägermaterial |
US7155144B2 (en) * | 2004-07-30 | 2006-12-26 | Xerox Corporation | Photoreceptor belt tensioner providing low variation in belt tension as a function of belt length |
US7590375B2 (en) * | 2005-09-13 | 2009-09-15 | Canon Kabushiki Kaisha | Image-forming apparatus having movable tensioner and electrode member that reduce toner scatter |
DE102006032703A1 (de) | 2006-07-14 | 2008-01-24 | OCé PRINTING SYSTEMS GMBH | Verfahren und Anordnung zum Erzeugen einer vorgegebenen Umlaufgeschwindigkeit eines endlosen bandförmigen Bildträgers |
JP4876956B2 (ja) * | 2007-02-19 | 2012-02-15 | セイコーエプソン株式会社 | 媒体処理装置 |
JP5009043B2 (ja) * | 2007-05-14 | 2012-08-22 | 株式会社リコー | 転写装置、画像形成装置 |
DE102008063955B4 (de) | 2008-12-19 | 2012-02-23 | OCé PRINTING SYSTEMS GMBH | Verfahren zum Steuern und Regeln eines endlosen Bandes in einem Drucker oder Kopierer beim Verschwenken des Bandes |
US10053317B2 (en) * | 2016-08-08 | 2018-08-21 | Ricoh Company, Ltd. | Contact-and-separation system, image forming apparatus, and contact-and-separation method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5258816A (en) * | 1990-01-26 | 1993-11-02 | Konica Corporation | Cleaning device for a color image forming apparatus |
JPH04204760A (ja) | 1990-11-30 | 1992-07-27 | Hitachi Koki Co Ltd | 電子写真式印刷装置 |
JP3172239B2 (ja) * | 1991-03-30 | 2001-06-04 | 株式会社リコー | 画像形成装置 |
JP3316685B2 (ja) * | 1991-08-26 | 2002-08-19 | 株式会社リコー | 多色画像形成装置 |
JPH06124049A (ja) * | 1992-08-28 | 1994-05-06 | Ricoh Co Ltd | 画像形成装置 |
US5565975A (en) * | 1994-06-10 | 1996-10-15 | Matsushita Electric Industrial Co., Ltd. | Color image forming apparatus and method having toner images transferred to a paper sheet |
US5828934A (en) | 1995-06-07 | 1998-10-27 | Konica Corporation | Driving device of developing units and toner replenishing units for use in image forming apparatus |
US5797077A (en) * | 1996-04-04 | 1998-08-18 | Fuji Xerox Co., Ltd. | Double-sided images forming apparatus and method using the same |
JPH1010889A (ja) * | 1996-06-20 | 1998-01-16 | Canon Inc | 画像形成装置 |
CN1115608C (zh) * | 1997-03-03 | 2003-07-23 | Oce印刷系统有限公司 | 能调节性能地进行印刷的印刷或复印装置及方法 |
US5983062A (en) * | 1997-04-18 | 1999-11-09 | Canon Kabushiki Kaisha | Image forming apparatus with shifting means to position image transfer unit |
KR200151066Y1 (ko) * | 1997-07-18 | 1999-07-15 | 윤종용 | 칼라 레이저 프린터 |
-
2000
- 2000-03-10 WO PCT/EP2000/002136 patent/WO2000054266A2/de active IP Right Grant
- 2000-03-10 EP EP00916924A patent/EP1159741B1/de not_active Expired - Lifetime
- 2000-03-10 DE DE50014443T patent/DE50014443D1/de not_active Expired - Lifetime
- 2000-03-10 US US09/936,099 patent/US6606475B1/en not_active Expired - Fee Related
- 2000-03-10 JP JP2000604411A patent/JP4430243B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0054266A3 * |
Also Published As
Publication number | Publication date |
---|---|
DE50014443D1 (de) | 2007-08-09 |
WO2000054266A3 (de) | 2000-12-28 |
WO2000054266A2 (de) | 2000-09-14 |
EP1159741B1 (de) | 2007-06-27 |
JP2002539484A (ja) | 2002-11-19 |
US6606475B1 (en) | 2003-08-12 |
JP4430243B2 (ja) | 2010-03-10 |
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