EP1565793A1 - Vorrichtung für das elektrische aufladen eines transportbandes bei kontakt zu einer klinge - Google Patents
Vorrichtung für das elektrische aufladen eines transportbandes bei kontakt zu einer klingeInfo
- Publication number
- EP1565793A1 EP1565793A1 EP03811348A EP03811348A EP1565793A1 EP 1565793 A1 EP1565793 A1 EP 1565793A1 EP 03811348 A EP03811348 A EP 03811348A EP 03811348 A EP03811348 A EP 03811348A EP 1565793 A1 EP1565793 A1 EP 1565793A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- contact element
- conveyor belt
- plastic film
- contact
- 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
- G03G15/167—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 at least one of the recording member or the transfer member being rotatable during the transfer
- G03G15/168—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 at least one of the recording member or the transfer member being rotatable during the transfer with means for conditioning the transfer element, e.g. cleaning
Definitions
- the present invention relates to a device and a method for electrically charging a conveyor belt for the transport of recording media in the transfer printing area of an electrophotographic printer or copier.
- the invention further relates to an associated blade-like contact element.
- transfer printing In electrophotographic printers or copiers, the transfer of a toner image from an intermediate carrier, for example a photoconductor drum or a photoconductor tape, to a recording medium is referred to as transfer printing.
- the section of the printer or copier at which the intermediate carrier and the recording medium are brought into contact with one another is referred to as the transfer printing area.
- the intermediate carrier e.g. the surface of a photoconductor drum and the recording medium at the same speed in the same direction, while the toner is transferred from the intermediate carrier to the recording medium.
- a good print image on the record carrier can only be achieved if there is even contact between the record carrier and the intermediate carrier in the transfer printing area.
- Record carriers and intermediate carriers can be reached with the aid of an electrostatically chargeable conveyor belt on which the record carrier is transported lying on and adhering to it through the transfer printing area with electrostatic forces.
- a device for transferring a toner image with the aid of an electrostatically chargeable conveyor belt is in the not previously published DE 102 47 368.4, which is incorporated by reference into the present description.
- the conveyor belt is charged with a charge whose sign is different from the sign of the charge on the toner image.
- This electrostatic charging of the conveyor belt has a dual function: on the one hand it causes an electrostatic attraction of the recording medium to the conveyor belt and thus a secure guidance of the recording medium in the transfer printing area, on the other hand it causes the transfer of the toner image from the intermediate medium to the recording medium.
- a corotron usually comprises one or more thin, gold-coated tungsten wires, the electrical potential of which is a few 1000 V compared to a grounded housing, so that the air surrounding the wires is ionized.
- corotrons have a number of serious disadvantages, for example ozone formation due to the high charging voltage and the relatively time-consuming changing of worn corotron wires.
- the corotron wires easily become dirty with dust, belt abrasion and toner particles, which leads to an irregular load distribution on the conveyor belt. Places with a lower conveyor belt load lead to a less complete transfer of the toner to the record carrier and thus to undesired brightening of the printed image.
- the cleaning of the corotron wires is not only complex, but also represents a considerable mechanical stress for them and shortens their service life.
- Contact rollers also have the disadvantage that they can easily become dirty and thus lead to irregular loading of the conveyor belt.
- the invention has for its object to provide a device and a method for loading the conveyor belt, which allow a uniform loading of the conveyor belt in the transfer area and require little maintenance.
- a device and a method in which a blade-like contact element is arranged transversely to the running direction of the conveyor belt, via which electrical charge is transferred to the conveyor belt, and in which the blade-like contact element is connected to a printer or
- Copier insertable and withdrawable from this support member is arranged.
- Such a blade-like contact element can be arranged directly in the transfer area, on the side of the conveyor belt facing away from the intermediate carrier, and thus ensures reliable, uniform charging of the conveyor belt in the transfer area. Since the conveyor belt constantly grinds along the blade-like contact element, it is constantly cleaned. Because the support element can be pulled out, the blade-like contact element is easily accessible for maintenance work.
- the blade-like contact is preferably Telement releasably attached to the support element so that it is easily replaceable as a wearing part.
- FIG. 1 shows a schematic illustration of the components of an electrophotographic printer or copier involved in the image generation
- Figure 2 is a perspective view of a paper transport unit for a printer or copier, in which the support element for the blade-like contact element is pulled out;
- Figure 3 is a perspective view of the paper transport unit of Figure 2, in which the support member is inserted;
- Figure 4 is a perspective view of the support member and the blade-like contact member; and Figure 5 is a perspective view of the support member and the blade-like contact element of Figure 4 from a different direction.
- FIG. 1 shows a photoconductor drum 10, the peripheral surface of which is coated with a photo semiconductor, for example arsenic triselenide (As 2 Se). Also shown in FIG. 1 is a charging corotron 12 for charging the photo semiconductor layer of the photoconductor drum 10, a character generator 14 for exposing the photo semiconductor layer to form a latent charge image thereon, and a developing unit 16 for developing the latent charge image with charged toner particles.
- a photoconductor drum 10 the peripheral surface of which is coated with a photo semiconductor, for example arsenic triselenide (As 2 Se).
- As 2 Se arsenic triselenide
- a paper transport unit 18 is also shown schematically by a dashed box.
- the paper transport unit 18 comprises a conveyor belt 20, which is guided around a first roller 22, a second roller 24, a tension roller 26 and an opening roller 28.
- the conveyor belt 20 is driven by the first roller 22 in the direction indicated by the arrow 30.
- the paper transport unit 18 comprises a device 32 for electrically charging the conveyor belt 20, which is shown only schematically in FIG. 1.
- the device 32 comprises a blade-like contact element 34 which is arranged transversely to the running direction of the conveyor belt 20 and abuts against it.
- the paper transport unit 18 comprises a cleaning unit 36 with a scraping bar 38 for scraping off
- Toner particles from the conveyor belt 20 and a toner collection container 40 for collecting the scraped-off toner Toner particles from the conveyor belt 20 and a toner collection container 40 for collecting the scraped-off toner.
- FIG. 1 shows a cleaning unit 42 for cleaning the photoconductor drum and a fixing unit 44 for fixing the toner image on the toner. More detailed explanations on the function of the listed elements of Figure 1 can be found in the above-mentioned, not previously published DE 102 47 368.4, and should not be repeated here.
- the conveyor belt 20 serves to transport a sheet of paper 46, likewise shown in FIG. 1, through the transfer printing area 48, in which the sheet of paper 46 is pressed onto the photoconductor drum 10.
- the conveyor belt 20 is charged by the device 32 with a charge that is opposite to the charge of the toner particles.
- the electrostatic charge of the conveyor belt 20 ensures that the sheet 46 is held securely on the conveyor belt and for the transfer of the toner particles from the photoconductor drum 10 to the sheet 46.
- the blade-like contact element 34 touches the conveyor belt 20 in the transfer printing area on the side facing away from the photoconductor drum 10 (the underside in the illustration in FIG. 1). This means that the electrical charge is transferred to the conveyor belt 20 exactly where it is needed. This is because when the toner is transferred from the photoconductor drum 10 to the sheet 46, an electric current flows from the conveyor belt 20 to the photoconductor drum 10. Since the contact blade 34 is arranged in the transfer area 48, this current does not have to flow in the longitudinal direction of the conveyor belt 20 to the transfer area 48.
- FIG. 2 the paper transport unit 18, which was shown only schematically in Figure 1, is shown in a perspective view.
- the conveyor belt 20 described in connection with FIG. 1, the first roller 22 (or its axis), the second roller 24, the tensioning roller 26 (or its axis), the opening roller 28 and the toner collecting container 40 can be seen the device 32 for electrically charging the conveyor belt 20 is shown.
- the device 32 comprises a support element 48 made of plastic, to which the blade-like contact element 34 is attached.
- the paper transport unit 18 has a receptacle 50 into which the support element 48 with the contact element 34 attached can be inserted.
- FIG. 3 shows the paper transport unit 18 with the carrying elements 48 pushed in.
- the carrying element 48 has an engagement section 52, on which it can be gripped when it is inserted into or pulled out of the paper transport unit 18.
- a latching hook 54 (see FIG. 2) is integrated in the engagement section 52, which is biased into a locked position in which it engages in a suitable groove 55 in the receptacle 50 when the carrying element 48 is fully inserted into the paper transport unit 18.
- the latching hook 54 can be lifted out of its locked position against the bias by actuating a release button 56, so that the carrying element 48 can be pulled out of the paper transport unit 18.
- Carrying element 48 is a first plug element 58 (Fig. 2, Fig, 3).
- a second plug element (not shown) is located in the printer, with which the first plug element 58 forms an electrical plug connection when the support element 48 is completely inserted into the paper transport unit 18 (and this in turn is inserted into the printer).
- the support member 48 and the blade-like contact element 34 are shown in the non-assembled state.
- the blade-like contact element comprises an angle plate with a first section 60 and a second section 62, which in the exemplary embodiment shown form an angle of approximately 90 ° with one another.
- the second section 62 of the blade-like contact element 34 has two bent sections
- a film 68 made of polyimide is glued to the first section 60 of the angle plate with a conductive adhesive.
- the film 68 has a thickness of 75 ⁇ m.
- the support element 48 has a substantially V-shaped cross section, which is formed from a base surface 70 and a rear wall 72.
- Blocks 74 are arranged on the base surface 70, which are spaced apart from the rear wall 72 and each form a groove 76 therewith.
- Such a groove 76 can be seen particularly well in FIG. 5, in which the carrying element 48 and the blade-like contact element 34 are shown from a different point of view.
- pressure pins 78 are spring-loaded, which are biased against the rear wall 72.
- a web 80 is arranged on the bottom surface 70, which forms a further groove 82 together with the rear wall 72.
- the groove 82 and the three grooves 76 form a receptacle into which the second section 62 of the blade-like contact element 34 can be inserted in a form-fitting manner.
- the two outer pressure pins 78 press on the second section 62 of the blade-like contact element 34 and hold it in position.
- the middle pressure pin 78 has a rounded tip and engages in the cutout 66 in the second section 62 of the blade-like contact element 34, wherein it exerts pressure on the lower edge of the cutout 66 in the illustration in FIG. 4 and thereby a force component on the blade-like contact element 34 exercises that pushes this into the recording.
- a guide section 86 engages on the blade-like contact element 34, if it is inserted into the receptacle of the support element 48.
- the guide section 86 and the notch 84 help to find the correct position when inserting the blade-like contact element 34 into the receptacle of the carrying element 48.
- the blade-like contact element 34 When inserting the blade-like contact element 34 into or removing it from the receptacle of the carrying element 48, the blade-like contact element can be gripped on the bent-over sections 64.
- the blade-like contact element 34 is a wearing part and can be exchanged easily and without the aid of tools in the manner described here. In particular, the exchange of the blade-like contact element is facilitated by the fact that the carrying element can simply be pulled out of the printer or copier (in the exemplary embodiment shown, from the paper transport unit 18 of such a unit) and inserted again.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10253698 | 2002-11-18 | ||
| DE10253698A DE10253698A1 (de) | 2002-11-18 | 2002-11-18 | Vorrichtung zum elektrischen Aufladen eines Transportbandes mit einem klingenartigen Kontaktelement |
| PCT/EP2003/011487 WO2004046830A1 (de) | 2002-11-18 | 2003-10-16 | Vorrichtung für das elektrische aufladen eines transportbandes bei kontakt zu einer klinge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1565793A1 true EP1565793A1 (de) | 2005-08-24 |
| EP1565793B1 EP1565793B1 (de) | 2008-12-31 |
Family
ID=32185814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03811348A Expired - Lifetime EP1565793B1 (de) | 2002-11-18 | 2003-10-16 | Vorrichtung für das elektrische aufladen eines transportbandes bei kontakt zu einer klinge |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7496322B2 (de) |
| EP (1) | EP1565793B1 (de) |
| DE (2) | DE10253698A1 (de) |
| WO (1) | WO2004046830A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004057999B4 (de) * | 2004-12-01 | 2007-02-15 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Umdrucken eines Tonerbildes aus elektrisch geladenen Tonerteilchen von einem Tonerbildträger auf ein Trägermaterial |
| DE102005024380B4 (de) | 2005-05-27 | 2007-05-16 | Oce Printing Systems Gmbh | Vorrichtung und Verfahren zum elektrischen Aufladen eines Transportbandes unter Verwendung einer Kontaktlippe aus einem Gummimaterial |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5353101A (en) * | 1990-01-24 | 1994-10-04 | Canon Kabushiki Kaisha | Charging member featuring a cut edge, and charging device employing same for use in a detachable process unit in an image forming apparatus |
| US5159392A (en) | 1990-04-23 | 1992-10-27 | Ricoh Company, Ltd. | Image forming apparatus for forming an image on one or both sides of a recording medium |
| US5461461A (en) * | 1992-01-22 | 1995-10-24 | Ricoh Company, Ltd. | Image transferring device and medium separating device for an image forming apparatus |
| JPH07248693A (ja) * | 1994-01-19 | 1995-09-26 | Ricoh Co Ltd | 画像形成装置 |
| JP3414565B2 (ja) * | 1994-12-27 | 2003-06-09 | セイコーエプソン株式会社 | 接触帯電装置 |
| JPH11161058A (ja) | 1997-11-28 | 1999-06-18 | Tokai Rubber Ind Ltd | 転写ブレード |
| JPH11219049A (ja) | 1998-01-30 | 1999-08-10 | Canon Inc | 画像形成装置 |
| JP2000321890A (ja) | 1999-05-10 | 2000-11-24 | Canon Inc | 画像形成装置 |
| JP2001175095A (ja) | 1999-12-14 | 2001-06-29 | Tokai Rubber Ind Ltd | 転写ブレード |
| JP2001337548A (ja) * | 2000-05-24 | 2001-12-07 | Canon Inc | 画像形成装置 |
| JP3780148B2 (ja) * | 2000-05-26 | 2006-05-31 | キヤノン株式会社 | 画像形成装置 |
| DE10247368B4 (de) | 2002-10-10 | 2004-12-02 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zur Übertragung eines Tonerbildes mit Hilfe eines elektrostatisch aufladbaren, Transportbandes |
| DE102005024380B4 (de) * | 2005-05-27 | 2007-05-16 | Oce Printing Systems Gmbh | Vorrichtung und Verfahren zum elektrischen Aufladen eines Transportbandes unter Verwendung einer Kontaktlippe aus einem Gummimaterial |
-
2002
- 2002-11-18 DE DE10253698A patent/DE10253698A1/de not_active Withdrawn
-
2003
- 2003-10-16 DE DE50311021T patent/DE50311021D1/de not_active Expired - Lifetime
- 2003-10-16 US US10/535,543 patent/US7496322B2/en not_active Expired - Fee Related
- 2003-10-16 WO PCT/EP2003/011487 patent/WO2004046830A1/de not_active Ceased
- 2003-10-16 EP EP03811348A patent/EP1565793B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004046830A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070041755A1 (en) | 2007-02-22 |
| US7496322B2 (en) | 2009-02-24 |
| EP1565793B1 (de) | 2008-12-31 |
| DE50311021D1 (de) | 2009-02-12 |
| WO2004046830A1 (de) | 2004-06-03 |
| DE10253698A1 (de) | 2004-05-27 |
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