EP0345270B1 - Play-free bearing installation for guide drums in printers or photocopiers - Google Patents

Play-free bearing installation for guide drums in printers or photocopiers Download PDF

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Publication number
EP0345270B1
EP0345270B1 EP88901025A EP88901025A EP0345270B1 EP 0345270 B1 EP0345270 B1 EP 0345270B1 EP 88901025 A EP88901025 A EP 88901025A EP 88901025 A EP88901025 A EP 88901025A EP 0345270 B1 EP0345270 B1 EP 0345270B1
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EP
European Patent Office
Prior art keywords
drum
drive shaft
receiving flange
bearing
flange
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.)
Expired - Lifetime
Application number
EP88901025A
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German (de)
French (fr)
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EP0345270A1 (en
Inventor
Siegfried Schreyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Wincor Nixdorf International GmbH
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Publication of EP0345270A1 publication Critical patent/EP0345270A1/en
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Publication of EP0345270B1 publication Critical patent/EP0345270B1/en
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    • 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
    • G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/751—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to drum

Definitions

  • the invention relates to a device for the detachable fastening of a drum designed as an intermediate carrier of a non-mechanical printing or copying device according to the preamble of patent claim 1.
  • Such a device is known from DE-OS 27 17 055.
  • the photoconductor drum has turned-out cylindrical projections on both ends, which cooperate with corresponding approaches of drum-receiving flanges arranged on the drive shaft.
  • One drum mounting flange is firmly connected to the drive shaft, the other can be detachably pushed onto the drive shaft via a through hole.
  • a clamping device which is screwed to the drive shaft, resiliently presses the releasable drum mounting flange against the drum and the latter against the stationary drum mounting flange.
  • the concentricity of the photoconductor drum that can be achieved with such a device depends on the difference in play between the drum mounting flanges and the inside diameter of the photoconductor drum, on the difference in play between the through-hole of the detachable drum mounting flange and the drive shaft and also on the actual concentricity of the drive shaft.
  • the object of the invention is to design a device of the type mentioned in such a way that a high concentricity is achieved despite the easy interchangeability of the drum-shaped intermediate carrier. Damage and impairment of the surface of the drum-shaped intermediate carrier should be avoided.
  • the first drum receiving flange is connected to the drive shaft via ribs which are designed as precentering elements for the drum and extend along the inner wall of the drum.
  • the ribs pass through the replaceable drum mounting flange at the openings provided, so that the drum can be easily replaced when the drum mounting flange is removed.
  • the drum can be placed on the rib-shaped precentering elements without damaging the surface.
  • the fine centering is then carried out by screwing in the tensioning device and tensioning the drum between the drum mounting flanges.
  • the drive shaft is supported at both ends, namely at one end via a bearing which is fixedly associated with the housing and at the other end via a removable bearing.
  • the bearing is advantageously arranged on the inside of a bearing plate that can be screwed to the housing, the bearing plate being designed in such a way that it completely covers the access area for the drum in a dust-free and contact-safe manner when installed.
  • the drum-shaped intermediate carrier the so-called photoconductor drum 10
  • the drum-shaped intermediate carrier is in a housing carrier 11 of the device in a printing device, which is not shown in detail here and works according to the principle of electrophotography rotatably mounted and is motor-driven via a pulley 12 and a drive shaft 13.
  • a first drum mounting flange 14 is fastened on the drive shaft 13 and firmly connected to it.
  • the first drum receiving flange 14 has ribs 15 which serve as precentering elements for the photoconductor drum and which extend beyond the width of the photoconductor drum 10.
  • the first drum receiving flange has a conical projection 16 which cooperates with a corresponding conical projection 17 of the photoconductor drum 10.
  • a counter-bearing to the first drum mounting flange is a second drum mounting flange 18 which is detachably connected to the drive shaft 13 and which also has a conical extension 19 which in turn interacts with a corresponding conical extension 20 of the other end of the photoconductor drum 10.
  • the second drum receptacle flange 18 has a through hole 21 and is supported on corresponding projections 24 of the drive shaft 13 via an annular sleeve 22 and a pressure ring 23.
  • ring clamping disks 25 are arranged, which can be spread over the pressure ring 23 and thus center the through hole 21 of the second drum mounting flange 18 on the drive shaft 13.
  • a tensioning device is provided which has a handwheel 26 which can be screwed onto the drive shaft 13.
  • the handwheel 26 is secured via a ring on the second drum mounting flange and is supported on the second drum mounting flange 18 via a compression spring 27.
  • An attachment piece 28 presses against the pressure ring 23 when it is screwed in.
  • the drive shaft itself and thus the drum mounting flange is on the one hand via a fixed bearing made up of two bearing elements 29 and 30 and on the other hand via a detachable counter bearing 31 stored in the housing support 11.
  • the counter bearing 31 consists of a bearing plate 34 which can be releasably connected to the housing support 11 by means of knurled screws 32 and centering pins 33 and which has a ball bearing 35 on the inside for mounting the drive shaft 13.
  • Installation of the photoconductor drum 10 is accomplished as follows, starting from the functional position shown in FIG. 3 with the end plate 34 removed. First, the photoconductor drum 10 is pushed onto the ribs 15, which serve as pre-centering elements and which protrude into the area of the housing support 11. Then the second drum mounting flange is attached and the tensioning device is screwed to the handwheel 26. The compression spring 27 presses the photoconductor drum 10 with the conical projections 19 and 20 against the conical projections 16 and 17 of the first drum receiving flange via the second drum receiving flange 18.
  • the force on the pressure ring 23 increases, which compresses the ring tensioning disks 25, whereby a positive and non-positive connection between the drive shaft 13 and the second drum receiving flange 18 is achieved.
  • the maximum of the positive or non-positive connection is reached when the tensioning device is turned to the stop with the handwheel 26.
  • the force of the compression spring 27 also results in a positive and non-positive connection via the conical projections 16, 17, 19, 20 of the first and second drum receiving flanges and the photoconductor drum 10 between the photoconductor drum 10 and the drum receiving flanges.
  • the spreading device consists of annular clamping disks 25 which are located directly on the through bore 21 of the second drum receiving flange 18 and the drive shaft 13 support.
  • annular clamping disks 25 which are located directly on the through bore 21 of the second drum receiving flange 18 and the drive shaft 13 support.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Abstract

To obtain a play-free bearing installation for a guide drum (10) in a non-mechanical printer or photocopier, which at the same time permits easy replacement of the guide drum (10), the latter is guided by two seating flanges (14, 15) with conical necks (16). One seating flange (14) is integral with the drive shaft (13) of the film guide drum (10), the other (18) is removable. A tensioning device screwed on to the drive shaft (13) ensures the necessary locking by shape and force between the guide drum (10) and the seating flanges (14, 18). Expansion elements (25) between the drive shaft (13) and the removable seating flange (18) ensure shape and force locking between the said shaft and said flange and centre them. The drive shaft (13) has a bearing on either side, one of which (35) is removable and located on a plate (34) covering the area of access to the drum.

Description

Die Erfindung betrifft eine Einrichtung zum lösbaren Befestigen einer als Zwischenträger eines nichtmechanischen Druck- oder Kopiergerätes ausgebildeten Trommel gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a device for the detachable fastening of a drum designed as an intermediate carrier of a non-mechanical printing or copying device according to the preamble of patent claim 1.

Eine derartige Einrichtung ist aus der DE-OS 27 17 055 bekannt. Bei der dort beschriebenen Einrichtung weist die Fotoleitertrommel an beiden Enden ausgedrehte zylindrische Ansätze auf, die mit entsprechenden Ansätzen von auf der Antriebswelle angeordneten Trommelaufnahmeflanschen zusammenwirken. Ein Trommelaufnahmeflansch ist dabei fest mit der Antriebswelle verbunden, der andere lösbar über eine Durchgangsbohrung auf die Antriebswelle aufschiebbar. Eine Spannvorrichtung, die mit der Antriebswelle verschraubt wird, drückt den lösbaren Trommelaufnahmeflansch federnd gegen die Trommel und diese gegen den ortsfesten Trommelaufnahmeflansch.Such a device is known from DE-OS 27 17 055. In the device described there, the photoconductor drum has turned-out cylindrical projections on both ends, which cooperate with corresponding approaches of drum-receiving flanges arranged on the drive shaft. One drum mounting flange is firmly connected to the drive shaft, the other can be detachably pushed onto the drive shaft via a through hole. A clamping device, which is screwed to the drive shaft, resiliently presses the releasable drum mounting flange against the drum and the latter against the stationary drum mounting flange.

Die mit einer derartigen Einrichtung erreichbare Rundlaufgenauigkeit der Fotoleitertrommel ist abhängig von dem Differenzspiel zwischen den Trommelaufnahmeflanschen und dem Innendurchmesser der Fotoleitertrommel, von dem Differenzspiel zwischen Durchgangsbohrung des lösbaren Trommelaufnahmeflansches und Antriebswelle und weiters von der eigentlichen Rundlaufgenauigkeit der Antriebswelle.The concentricity of the photoconductor drum that can be achieved with such a device depends on the difference in play between the drum mounting flanges and the inside diameter of the photoconductor drum, on the difference in play between the through-hole of the detachable drum mounting flange and the drive shaft and also on the actual concentricity of the drive shaft.

Bei mit Zwischenträgern arbeitenden Druckgeräten wie elektrofotografischen Druckgeräten oder magnetischen Druckgeräten ist eine hohe Rundlaufgenauigkeit des trommelförmigen Zwischenträgers sehr wichtig hinsichtlich der Qualität des erzeugten Druckbildes. Dies insbesondere dann, wenn mit einer hohen Zeichenauflösung gedruckt werden soll. Werden außerdem zur Erzeugung von Mehrfarbendruck oder von Vorund Rückseitendruck mehrere Druckgeräte gekoppelt, so summieren sich die Rundlaufungenauigkeiten jeder am Druck beteiligten Druckeinrichtung.In the case of printing devices working with intermediate carriers, such as electrophotographic printing devices or magnetic printing devices, high concentricity of the drum-shaped intermediate carrier is very important with regard to the quality of the print image produced. This is especially the case if you want to print with a high character resolution. If several printing devices are also coupled to produce multi-color printing or front and back printing, add up the concentricity of each printing device involved in printing.

Aufgabe der Erfindung ist es, eine Einrichtung der eingangs genannten Art so auszugestalten, daß trotz leichter Austauschbarkeit des trommelförmigen Zwischenträgers eine hohe Rundlaufgenauigkeit erreicht wird. Eine Beschädigung und Beeinträchtigung der Oberfläche des trommelförmigen Zwischenträgers soll vermieden werden.The object of the invention is to design a device of the type mentioned in such a way that a high concentricity is achieved despite the easy interchangeability of the drum-shaped intermediate carrier. Damage and impairment of the surface of the drum-shaped intermediate carrier should be avoided.

Diese Aufgabe wird bei einer Einrichtung der eingangs genannten Art gemäß dem kennzeichnenden Teil des ersten Patentanspruches gelöst.This object is achieved in a device of the type mentioned at the outset according to the characterizing part of the first claim.

Vorteilhafte Ausführungsformen der Erfindung sind in den Abhängigen Ansprüchen gekennzeichnet.Advantageous embodiments of the invention are characterized in the dependent claims.

Dadurch, daß zum Zentrieren des zweiten austauschbar ausgestalteten Trommelaufnahmeflansches auf der Antriebswelle zwischen der Antriebswelle und dem Trommelaufnahmeflansch sich beim Verschrauben der Spanneinrichtung mit der Antriebswelle verspreizende Spreizelemente angeordnet sinddie z.B. aus Spannscheiben bestehen können - wird der Trommelaufnahmeflansch exakt auf die Antriebswelle lagerluftfrei, zentriert. Durch die zusätzliche Maßnahme der konischen Ausbildung der Enden der Trommel und der Trommelaufnahmeflansche kann zwischen den Trommelaufnahmeflanschen und der Trommel ebenfalls kein Lagerspiel auftreten.Characterized in that for centering the second interchangeably designed drum receiving flange on the drive shaft between the drive shaft and the drum receiving flange are spreading elements arranged when screwing the tensioning device to the drive shaft, e.g. can consist of spring washers - the drum mounting flange is centered exactly on the drive shaft without clearance. Due to the additional measure of the conical design of the ends of the drum and the drum receiving flanges, no bearing play can occur between the drum receiving flanges and the drum.

Bei einer vorteilhaften Ausführungsform der Erfindung ist der erste Trommelaufnahmeflansch über als Vorzentrierelemente für die Trommel ausgebildete, sich entlang der Trommelinnenwand erstreckende Rippen mit der Antriebswelle verbunden. Die Rippen durchgreifen dabei den austauschbaren Trommelaufnahmeflansch an den vorgesehenen Öffnungen, so daß im abgenommenen Zustand des Trommelaufnahmeflansches ein leichtes Austauschen der Trommel möglich ist. Die Trommel kann dabei ohne daß es zu Beschädigungen der Oberfläche kommen kann, zunächst auf den rippenförmigen Vorzentrierelementen aufgesetzt werden. Die Feinzentrierung erfolgt dann durch Einschrauben der Spannvorrichtung und Verspannen der Trommel zwischen den Trommelaufnahmeflanschen.In an advantageous embodiment of the invention, the first drum receiving flange is connected to the drive shaft via ribs which are designed as precentering elements for the drum and extend along the inner wall of the drum. The ribs pass through the replaceable drum mounting flange at the openings provided, so that the drum can be easily replaced when the drum mounting flange is removed. The drum can be placed on the rib-shaped precentering elements without damaging the surface. The fine centering is then carried out by screwing in the tensioning device and tensioning the drum between the drum mounting flanges.

Bei einer weiteren Ausführungsform der Erfindung, die auch die Rundlaufungenauigkeit der Antriebswelle ausschaltet, ist die Antriebswelle an beiden Enden gelagert und zwar an einem Ende über ein dem Gehäuse ortsfest zugeordnetes Lager und an dem anderen Ende über ein abnehmbares Lager. Das Lager ist dabei in vorteilhafter Weise auf der Innenseite eines dem Gehäuse verschraubbaren Lagerschildes angeordnet, wobei das Lagerschild so ausgebildet ist, daß es den Zugangsbereich für die Trommel im eingebauten Zustand vollständig staubfrei und berührungssicher abdeckt.In a further embodiment of the invention, which also eliminates the concentricity of the drive shaft, the drive shaft is supported at both ends, namely at one end via a bearing which is fixedly associated with the housing and at the other end via a removable bearing. The bearing is advantageously arranged on the inside of a bearing plate that can be screwed to the housing, the bearing plate being designed in such a way that it completely covers the access area for the drum in a dust-free and contact-safe manner when installed.

Eine Ausführungsform der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden beispielsweise näher beschrieben. Es zeigen

  • FIG 1 eine Lagereinrichtung für eine Fotoleitertrommel in einer nach dem Prinzip der Elektrofotografie arbeitenden Druckeinrichtung im eingebauten Zustand der Fotoleitertrommel teilweise in Schnittdarstellung,
  • FIG 2 eine Schnittdarstellung der Lagereinrichtung im Bereich des lösbaren Trommelaufnahmeflansches im gespannten Zustand der Spannvorrichtung und
  • FIG 3 eine schematische Darstellung der Lagereinrichtung im entspannten Zustand der Spannvorrichtung.
An embodiment of the invention is shown in the drawings and is described in more detail below, for example. Show it
  • 1 shows a storage device for a photoconductor drum in a printing device which operates on the principle of electrophotography in the installed state of the photoconductor drum, partly in a sectional view,
  • 2 shows a sectional view of the bearing device in the region of the detachable drum mounting flange in the tensioned state of the tensioning device and
  • 3 shows a schematic representation of the bearing device in the relaxed state of the tensioning device.

In einer hier nicht im einzelnen dargestellten nach dem Prinzip der Elektrofotografie arbeitenden Druckeinrichtung ist der trommelförmige Zwischenträger, die sogenannte Fotoleitertrommel 10, in einem Gehäuseträger 11 des Gerätes drehbar gelagert und wird über eine Riemenscheibe 12 und eine Antriebswelle 13 motorisch angetrieben. Zur Lagerung der aus einem Hohlzylinder bestehenden Fotoleitertrommel 10, die an der Außenseite eine Fotoleiterschicht trägt, ist auf der Antriebswelle 13 und mit dieser fest verbunden, ein erster Trommelaufnahmeflansch 14 befestigt. Der erste Trommelaufnahmeflansch 14 weist Rippen 15 auf, die als Vorzentrierelemente für die Fotoleitertrommel dienen und die sich über die Breite der Fotoleitertrommel 10 hinaus erstrecken. Weiterhin weist der erste Trommelaufnahmeflansch einen konusförmigen Ansatz 16 auf, der mit einem entsprechenden konusförmigen Ansatz 17 der Fotoleitertrommel 10 zusammenarbeitet. Als Gegenlager zum ersten Trommelaufnahmeflansch dient ein lösbar mit der Antriebswelle 13 verbundener zweiter Trommelaufnahmeflansch 18, der ebenfalls einen konusförmigen Ansatz 19 aufweist, der wiederum mit einem entsprechenden konusförmigen Ansatz 20 des anderen Endes der Fotoleitertrommel 10 zusammenwirkt. Oer zweite Trommelaufnahmeflansch 18 weist eine Durchgangsbohrung 21 auf, und stützt sich über eine Ringhülse 22 und einen Druckring 23 auf entsprechenden Ansätzen 24 der Antriebswelle 13 ab. Zwischen der Ringhülse 22 und dem Druckring 23 sind Ringspannscheiben 25 angeordnet, die sich über den Druckring 23 verspreizen lassen und damit die Durchgangsbohrung 21 des zweiten Trommelaufnahmeflansches 18 auf die Antriebswelle 13 zentrieren. Zur lösbaren Befestigung des zweiten Trommelaufnahmeflansches ist eine Spannvorrichtung vorgesehen, die ein auf die Antriebswelle 13 aufschraubbares Handrad 26 aufweist. Das Handrad 26 ist über einen Ring auf dem zweiten Trommelaufnahmeflansch gesichert und stützt sich über eine Druckfeder 27 auf dem zweiten Trommelaufnahmeflansch 18 ab. Ein Ansatzstück 28 drückt beim Einschrauben gegen den Druckring 23.The drum-shaped intermediate carrier, the so-called photoconductor drum 10, is in a housing carrier 11 of the device in a printing device, which is not shown in detail here and works according to the principle of electrophotography rotatably mounted and is motor-driven via a pulley 12 and a drive shaft 13. To support the photoconductor drum 10, which consists of a hollow cylinder and has a photoconductor layer on the outside, a first drum mounting flange 14 is fastened on the drive shaft 13 and firmly connected to it. The first drum receiving flange 14 has ribs 15 which serve as precentering elements for the photoconductor drum and which extend beyond the width of the photoconductor drum 10. Furthermore, the first drum receiving flange has a conical projection 16 which cooperates with a corresponding conical projection 17 of the photoconductor drum 10. A counter-bearing to the first drum mounting flange is a second drum mounting flange 18 which is detachably connected to the drive shaft 13 and which also has a conical extension 19 which in turn interacts with a corresponding conical extension 20 of the other end of the photoconductor drum 10. The second drum receptacle flange 18 has a through hole 21 and is supported on corresponding projections 24 of the drive shaft 13 via an annular sleeve 22 and a pressure ring 23. Between the ring sleeve 22 and the pressure ring 23, ring clamping disks 25 are arranged, which can be spread over the pressure ring 23 and thus center the through hole 21 of the second drum mounting flange 18 on the drive shaft 13. For the releasable fastening of the second drum mounting flange, a tensioning device is provided which has a handwheel 26 which can be screwed onto the drive shaft 13. The handwheel 26 is secured via a ring on the second drum mounting flange and is supported on the second drum mounting flange 18 via a compression spring 27. An attachment piece 28 presses against the pressure ring 23 when it is screwed in.

Die Antriebswelle selbst und damit die Trommelaufnahmeflansche ist einerseits über ein ortsfestes Lager aus zwei Lagerelementen 29 und 30, andererseits über ein lösbares Gegenlager 31 im Gehäuseträger 11 gelagert. Das Gegenlager 31 besteht dabei aus einem über Rändelschrauben 32 und Zentrierstifte 33 mit dem Gehäuseträger 11 läsbar verbindbaren Lagerschild 34, das auf der Innenseite ein Kugellager 35 zur Lagerung der Antriebswelle 13 aufweist.The drive shaft itself and thus the drum mounting flange is on the one hand via a fixed bearing made up of two bearing elements 29 and 30 and on the other hand via a detachable counter bearing 31 stored in the housing support 11. The counter bearing 31 consists of a bearing plate 34 which can be releasably connected to the housing support 11 by means of knurled screws 32 and centering pins 33 and which has a ball bearing 35 on the inside for mounting the drive shaft 13.

Ein Einbau der Fotoleitertrommel 10 wird ausgehend von der in der FIG 3 dargestellten Funktionslage bei abgenommenen Lagerschild 34 wie folgt bewerkstelligt. Zunächst wird die Fotoleitertrommel 10 auf die Rippen 15, die als Vorzentrierelemente dienen und die bis in den Bereich des Gehäuseträgers 11 hervorragen, aufgeschoben. Dann wird der zweite Trommelaufnahmeflansch aufgesetzt und die Spannvorrichtung mit dem Handrad 26 verschraubt. Die Druckfeder 27 drückt über den zweiten Trommelaufnahmeflansch 18 die Fotoleitertrommel 10 mit den konusförmigen Ansätzen 19 und 20 an die konusförmigen Ansätze 16 und 17 des ersten Trommelaufnahmeflansches. Durch weiteres Einschrauben der Spannvorrichtung erhöht sich die Kraft auf den Druckring 23, der die Ringspannscheiben 25 zusammendrückt, womit ein Form- und Kraftschluß zwischen Antriebswelle 13 und zweitem Trommelaufnahmeflansch 18 erreicht wird. Das Maximum des Form- bzw. Kraftschlusses wird dann erreicht, wenn die Spannvorrichtung mit dem Handrad 26 auf Anschlag gedreht ist. Durch die Kraft der Druckfeder 27 wird außerdem ein Form- und Kraftschluß über die konusförmigen Ansätze 16, 17, 19, 20 des ersten und zweiten Trommelaufnahmeflansches und der Fotoleitertrommel 10 zwischen der Fotoleitertrommel 10 und den Trommelaufnahmeflanschen erreicht. Nach Festschrauben des Handrades wird dann das Lagerschild 34 mit dem Kugellager 35 auf das Ende der Antriebswelle aufgeschoben und über die Rändelschrauben 32 bzw. die Zentrierstifte 33 entsprechend der Darstellung der FIG 2 fixiert.Installation of the photoconductor drum 10 is accomplished as follows, starting from the functional position shown in FIG. 3 with the end plate 34 removed. First, the photoconductor drum 10 is pushed onto the ribs 15, which serve as pre-centering elements and which protrude into the area of the housing support 11. Then the second drum mounting flange is attached and the tensioning device is screwed to the handwheel 26. The compression spring 27 presses the photoconductor drum 10 with the conical projections 19 and 20 against the conical projections 16 and 17 of the first drum receiving flange via the second drum receiving flange 18. By further screwing in the tensioning device, the force on the pressure ring 23 increases, which compresses the ring tensioning disks 25, whereby a positive and non-positive connection between the drive shaft 13 and the second drum receiving flange 18 is achieved. The maximum of the positive or non-positive connection is reached when the tensioning device is turned to the stop with the handwheel 26. The force of the compression spring 27 also results in a positive and non-positive connection via the conical projections 16, 17, 19, 20 of the first and second drum receiving flanges and the photoconductor drum 10 between the photoconductor drum 10 and the drum receiving flanges. After the handwheel has been screwed on, the end shield 34 with the ball bearing 35 is then pushed onto the end of the drive shaft and fixed by means of the knurled screws 32 or the centering pins 33 as shown in FIG. 2.

In dem beschriebenen Beispiel der FIG 2 und 3 besteht die Spreizeinrichtung aus Ringspannscheiben 25, die sich unmittelbar auf der Durchgangsbohrung 21 des zweiten Trommelaufnahmeflansches 18 und der Antriebswelle 13 abstützen. Es ist jedoch auch möglich - in hier nicht dargestellter Weise - zwischen den Ringspannscheiben 25 und der Durchgangsbohrung 21 eine HülseIn the example described in FIGS. 2 and 3, the spreading device consists of annular clamping disks 25 which are located directly on the through bore 21 of the second drum receiving flange 18 and the drive shaft 13 support. However, it is also possible - in a manner not shown here - between the annular clamping disks 25 and the through hole 21 a sleeve

anzuordnen bzw. eine Hülse zwischen Antriebswelle 13 und Ringspannscheiben um z.B. eine Verletzung der Oberfläche der Durchgangsbohrung bzw. der Antriebswelle 13 der Ringspannscheiben zu vermeiden. Weiterhin ist es möglich, anstelle der Druckfeder, Tellerfedern zu verwenden.to arrange or a sleeve between the drive shaft 13 and ring washers to e.g. to avoid damage to the surface of the through hole or the drive shaft 13 of the ring washers. It is also possible to use disc springs instead of the compression spring.

Claims (7)

1. Device for detachably mounting on a drive shaft (13) a drum (10), constructed as an intermediate image carrier of a non-mechanical printer or copier, by means of a drum bearing which has a first drum receiving flange (14) which is permanently arranged on the drive shaft (13) and which receives with its inner edge a free end of the drum (10), and a second drum receiving flange (18) which is centred on the drive shaft (13), is movable in the axial direction and receives with its inner edge the other free end of the drum (10), a clamping device (26, 27) pressing the second drum receiving flange (18) resiliently against the drum (10) by screwing to the drive shaft (13) and pressing said drum against the first drum receiving flange (14), characterised in that in order to centre the second receiving flange (18) on the drive shaft (13) spreader elements (25) which expand during screwing to the drive shaft (13) are arranged between the drive shaft (13) and the second drum receiving flange (18).
2. Device according to Claim 1, characterised in that the inner edge of the second drum receiving flange (18) and/or the free ends of the drum (10) are of conical construction.
3. Device according to one of Claims 1 or 2, characterised in that the spreader elements are constructed as annular strain washers (25).
4. Device according to one of Claims 1 or 3, characterised in that the clamping device has a pressure ring (23) which actuates the spreader elements (25) during screwing.
5. Device according to one of Claims 1 to 4, characterised in that the first drum receiving flange (14) is connected to the drive shaft via ribs (15) which are constructed as precentering elements for the drum (10) and extend along the inner wall of the drum.
6. Device according to one of Claims 1 to 5, characterised in that the drive shaft (13) is mounted in the housing (11) by means of a bearing (29, 30) fixed to the housing and a corresponding bearing (31) removable for the purpose of changing the drum (10).
7. Device according to Claim 6, characterised in that the corresponding bearing (31) is arranged on one side on an end shield (34) which can be detachably connected to the housing, in such a way that in the installed state the end shield (34) completely covers the access to the drum (10).
EP88901025A 1987-02-09 1988-01-28 Play-free bearing installation for guide drums in printers or photocopiers Expired - Lifetime EP0345270B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3703942 1987-02-09
DE19873703942 DE3703942A1 (en) 1987-02-09 1987-02-09 GAME-FREE STORAGE DEVICE FOR PHOTO LADDER DRUMING IN PRINT OR COPY DEVICES

Publications (2)

Publication Number Publication Date
EP0345270A1 EP0345270A1 (en) 1989-12-13
EP0345270B1 true EP0345270B1 (en) 1992-04-08

Family

ID=6320579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901025A Expired - Lifetime EP0345270B1 (en) 1987-02-09 1988-01-28 Play-free bearing installation for guide drums in printers or photocopiers

Country Status (5)

Country Link
US (1) US5038172A (en)
EP (1) EP0345270B1 (en)
JP (1) JPH02502130A (en)
DE (2) DE3703942A1 (en)
WO (1) WO1988005931A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5283619A (en) * 1991-12-20 1994-02-01 Canon Kabushiki Kaisha Developing apparatus and process cartridge having same
US5218405A (en) * 1992-06-29 1993-06-08 Xerox Corporation Photoreceptor drum runout control apparatus
JPH0627859A (en) * 1992-07-08 1994-02-04 Ricoh Co Ltd Electrophotographic device
DE4315274C1 (en) * 1993-05-07 1994-06-30 Siemens Nixdorf Inf Syst Securing of replaceable photosensitive drum in electrostatic copier
US5357321A (en) * 1994-01-04 1994-10-18 Xerox Corporation Drum supporting hub and drum assembly
JP3839932B2 (en) * 1996-09-26 2006-11-01 キヤノン株式会社 Process cartridge, electrophotographic image forming apparatus, electrophotographic photosensitive drum and coupling
DE19722460C1 (en) * 1997-05-28 1999-02-04 Windmoeller & Hoelscher Bearing a cylindrical roller
DE19922986B4 (en) 1999-05-19 2006-01-12 OCé PRINTING SYSTEMS GMBH Apparatus and method for holding a drum in a printer or copier
EP1868043B1 (en) * 2000-05-17 2009-08-26 Eastman Kodak Company Device for positioning a cylinder liner on a core
ATE353046T1 (en) * 2000-05-17 2007-02-15 Eastman Kodak Co INTERCHANGEABLE CYLINDER ELEMENTS ON ELECTROGRAPHIC PRINTING UNITS
JP5021332B2 (en) 2007-02-19 2012-09-05 株式会社リコー Electrophotographic printer
JP5263676B2 (en) * 2009-02-27 2013-08-14 株式会社リコー Photosensitive drum and image forming apparatus using the same
JP5483177B2 (en) * 2009-02-27 2014-05-07 株式会社リコー Photosensitive drum device and image forming apparatus using the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2021409C3 (en) * 1970-04-30 1980-04-10 Agfa-Gevaert Ag, 5090 Leverkusen Electrostatic copier with a replaceable copier drum
US3926515A (en) * 1972-07-31 1975-12-16 Ricoh Kk Photoreceptor changing apparatus for electrophotographic copying machines
DE2615617A1 (en) * 1976-04-09 1977-10-20 Agfa Gevaert Ag ELECTROSTATIC COPY DEVICE
US4120576A (en) * 1977-04-04 1978-10-17 Xerox Corporation Drum support apparatus
DE2717055A1 (en) * 1977-04-18 1978-10-19 Siemens Ag DEVICE FOR STORING A DRUM USED AS AN INTERMEDIATE CARRIER IN AN ELECTROSTATIC PRINCIPLE PRINTER OR COPY DEVICE
JPS5841517B2 (en) * 1980-12-09 1983-09-12 株式会社東芝 electronic copy machine
JPS5813559U (en) * 1981-07-17 1983-01-27 株式会社リコー Mounting structure of cylindrical photoreceptor

Also Published As

Publication number Publication date
WO1988005931A1 (en) 1988-08-11
DE3703942A1 (en) 1988-08-18
JPH02502130A (en) 1990-07-12
EP0345270A1 (en) 1989-12-13
DE3869953D1 (en) 1992-05-14
US5038172A (en) 1991-08-06

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