EP0003051B1 - Verfahren zum Aufbau von Druckzylindern mit flexiblem, metallischem Zylindermantel und Kopiergerät mit einem derartigen Druckzylinder - Google Patents

Verfahren zum Aufbau von Druckzylindern mit flexiblem, metallischem Zylindermantel und Kopiergerät mit einem derartigen Druckzylinder Download PDF

Info

Publication number
EP0003051B1
EP0003051B1 EP19780101857 EP78101857A EP0003051B1 EP 0003051 B1 EP0003051 B1 EP 0003051B1 EP 19780101857 EP19780101857 EP 19780101857 EP 78101857 A EP78101857 A EP 78101857A EP 0003051 B1 EP0003051 B1 EP 0003051B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
interior
shaft
pressure
cylinder
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
Application number
EP19780101857
Other languages
English (en)
French (fr)
Other versions
EP0003051A1 (de
Inventor
Jacobus Gerardus Vertegaal
Lodewijk Anselrode
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.)
Stork Brabant BV
Original Assignee
Stork Brabant BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stork Brabant BV filed Critical Stork Brabant BV
Publication of EP0003051A1 publication Critical patent/EP0003051A1/de
Application granted granted Critical
Publication of EP0003051B1 publication Critical patent/EP0003051B1/de
Expired legal-status Critical Current

Links

Images

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
    • G03G15/75—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 is concerned generally with printing apparatus which include cylinders for transferring of pigment to a substrate using electrostatic techniques.
  • the invention is advantageously utilizable in the printing of multicolor images on substrates' which are either in long strip form or in the form of sheets of paper, fabric and the like.
  • Multicolor printing by conventional presses is a complex process from the point of making the color separations, forming the cylinders, operating the presses, providing the pigment or inks for the separate cylinders or other plates, etc.
  • photo- electrostatic imaging is effected by charging the surface of a photoconductive coating in darkness, exposing the same to a light image, then toning the latent image with fine particles either in powder form or suspended in a solvent.
  • the toned or developed image can either be transferred to a receptor or it can be fused in place directly onto the electrophotographic member of which the photoconductive coating is a part.
  • One of the coatings which has been evolved recently is a high gain, high resolution, easily charged, fully dischargeable, wholly inorganic, microcrystalline photoconductive - material which has especially the property that it is rugged and extremely flexible when coated onto a thin flexible substrate.
  • the material is disclosed in U.S. Patent 4.025.339.
  • This coating is advantageous in addition to being flexible in that it can be imaged quickly in a high speed press and discharged readily by amient light so that, as will be explained, it can be provided with an image of toner that is insulating and thereafter charged to apply a charge to the insulating toner while permitting the charge on the untoned areas to be dissipated in light. Secondary toner then can be adhered to the primary toned image and transferred to a substrate.
  • Thin-walled metal sleeves of electrodeposited nickel, copper, iron or other metal have been used in the fabric and other substrate printing field with success.
  • Sleeves of plated metal may be used, such as for example, tin, chromium or other metals as nickel. These sleeves are a fraction of a millimeter thick and can be several meters long and as much as a third of a meter in diameter. They are seamless and are readily supported in printing machines.
  • sleeve is disclosed in U.S. Patent 2.287.122. Such sleeve is foraminous in order to enable ink or other pigment to be expressed by doctor means through the walls of the cylinders onto the passing substrate.
  • the walls are provided with suitable designs in the surface blocking certain of the holes and leaving others open.
  • these sleeves are sputtered with coatings of the photoconductive material which has been mentioned and are imperforate.
  • An important advantage of this type of sleeve is that it is light in weight, it is quite strong and is collapsible so that packing and shipping the same is economical.
  • the sleeves In using the sleeves, they must be mounted in cylindrical form on the printing press to receive and transfer the pigment, and must be supported on their interiors by using some readily installed or removed device to maintain the sleeves in rigid cylindrical form during use.
  • each of the ends of the sleeve is respectively clamped against the interior of a cylindrical surface for forming said ends into circles.
  • the invention also provides the mounting method according to claim 1, characterized in that the sleeve is unsupported along the remaining length between the ends of said sleeve.
  • the invention provides a printing press employing the said sleeve mounting and comprising
  • the invention provides the printing press further including the apparatus characterized in that the axially extending spacer means comprise an elongate rigid cylinder whose outer diameter is less than the inner diameter of the sleeve which is adapted to be supported by the apparatus whereby there will be a cylindrical space defined between the outer surface of the rigid cylinder and the inner surface of the sleeve when it is installed, the said pressure being supplied into said cylindrical space and the sleeve thereby being mechanically unsupported throughout its major length during use; and also the apparatus, characterized in that said means for applying pressure include means for introducing fluid under pressure in the framework and transmitting the pressure to said cylindrical space when the sleeve is installed in place.
  • Figure 1 there is illustrated in perspective view the type of cylinder 10 which is used with the invention, the same being based upon a sleeve 12 which has been formed by electrodeposition out of nickel, copper or the like, being quite thin - of the order of a small fraction of a millimeter and hence flexible or may comprise a naked sleeve plated with such metals as tin chromium or thus.
  • the resulting product is normally cylindrical and likewise, in sputtering the coating 14 the configuration of the sleeve 12 will be maintained in cylindrical form. It is possible for the sputtering to be carried on with the metal sleeve 12 forming the substrate for the coating in an oval configuration.
  • the sleeve 10 In the mounting of the sleeve or cylinder 10, it will invariably be in a cylindrical configuration for high speed printing presses, especially multicolor presses. Nonetheless the sleeve 10 is to some extent collapsible without damage to either the substrate of metal or the coating of microcrystalline photoconductive material.
  • the metal substrate comprising the sleeve 12 is stiff enough to handle, for example in a size which has a length of about two metres and a diameter which is about a sixth of a meter without axial collapsing or wrinkling, but can be readily compressed or collapsed laterally along its entire length to enable it to be shaped for example into oval form as shown in Figure 1.
  • FIG. 3 illustrates the environment in which the sleeve 10 is intended to be used.
  • a printing press 16 is shown, this being of a type which is intended to apply two colors of ink or dye carried in the fountains 18 and 20 in registration on a long strip-like substrate 22 of paper or the like.
  • the substrate 22 is guided by means of the rolls 24, 26, 28 and 30 to pass around a back-up roll 32 against which the printing will occur.
  • Two cylinders of the type described are shown at 10 and 10"'.
  • the direction of rotation of the drum 32 is indicated by the arrows 34, the direction of each of the cylinders 10 and 101/1 being indicated by arrows marked on the cylinders.
  • the cylinders 10 and 10 1/1 will be presumed to have images carried on their outer surfaces as primary toned images. These can be applied while the cylinders 10 and 10111 are off the apparatus 16 and the cylinders thereafter installed in the apparatus.
  • the cylinders are charged by suitable corona means at 36 and 38, the charging occurring in light so that the charges on the photoconductive coatings are immediately'dissipated leaving only the charges on the primary toner.
  • the type of toner chosen is one which is insulating when developed, that is, fused.
  • the fountains 18 and 20 contain the ink or dye which comprises the secondary toner.
  • the polarity of the particles of the secondary toner is established as the opposite of that of the charge on the primary toner. This can be done electrophoretically or by triboelectric techniques.
  • Electrical bias can be used to assist in this transfer. Transfer will be done in registration.
  • the printing cycle is repeated.
  • remaining secondary toner may be removed from the surfaces of the cylinders 10 and 10"' by suitable solvents or mechanical means at stations 40 and 42, with suitable solvents and/or mechanical means which do not affect the primary toner.
  • the cylinders 10 and 10"' could be provided with developed toned images and treated with suitable reagents or chemicals to render the toned' surfaces hydrophobic and the untoned surfaces hydrophyllic to enable the cylinders to be used as printing cylinders with greasy ink in watered offset printing presses.
  • suitable reagents or chemicals to render the toned' surfaces hydrophobic and the untoned surfaces hydrophyllic to enable the cylinders to be used as printing cylinders with greasy ink in watered offset printing presses.
  • the use of the cylinders in the type of printing apparatus operating by means of electrostatic techniques is preferred.
  • the cylinder 10 is required to be perfectly cylindrical and relatively rigid during its use and with its mounting or support, should be easily installed and removed from the printing press on which it is to be used. Likewise, it is required to be easily installed and removed from the mounting which carries it.
  • FIG 4 there is illustrated (in section) a form of mounting upon which the cylinder 10 is arranged for use in a printing press.
  • the mounting device 44 basically comprises a device in which the cylinder is suspended in cylindrical configuration and is kept inflated by means of a fluid such as oil or air or the like pumped into the interior of the cylinder 10 and maintained at a low pressure. It has been found that the cylinders 10 can be kept quite rigid and maintain their cylindrical configuration by means of pressures only slightly greater than atmospheric, say of the order of .5 to .7 of an atmosphere greater than ambient. This is considered a surprising result.
  • the cylinder ends must be tightly gripped in cylindrical configuration to prevent wrinkles and bulges.
  • the mounting device is basically formed of two stub shafts 46 and 48, shaft 48 being solid and shaft 46 being hollow.
  • a flanged disc 50 has an inwardly directed annular cup-like flange 52 whose interior diameter is very closely the outer diameter of the sleeve 10.
  • a hub 54 mounts the web 51 of the disc 50 on the hollow shaft 46 non-rotatively, the center of the shaft 46 having a through bore 56 whose inner end may be plugged at 58 but which is provided with a lateral opening at 60 that connects with a radial passageway 62 passing through the hub 54 but located axially interior of the web 51 of the disc 50, the web 51 being imperforate.
  • the interior end of the shaft 46 also has a large washer 64 secured thereto as by welding, the washer 64 supporting an elongate rigid metal cylinder 66 and being secured thereto, also by welding, for example.
  • This cylinder is included in the term axially extending spacer means as employed hereinafter.
  • a second disc 70 has a central hub 72 that may be secured to the shaft 48 permanently or non-rotatable relative thereto but held in place by a nut such as 74.
  • the body 76 of the disc is imperforate and has an inwardly directed cup-like annular flange 78 at its outer periphery having the same interior diameter as the flange 52.
  • Suitable packing is provided at 80 and 82 serving to prevent the leaking of fluid outwardly of the discs 50 and 70.
  • the disc 50 is held in place by the nut 81 engaging over the threaded end 83 of the shaft 46.
  • a sleeve 10 is shaped into a cylinder and fitted into the interior of the flange 78 and cemented in place with a suitable adhesive, primarily to render the telescoping connection fluid tight.
  • the flange 50 is not in place at this time.
  • the disc 50 is moved telescopically over the left hand end of the sleeve 10 and again the connection is effected with a coating of adhesive in place to provide a second fluid tight connection.
  • the adhesive has set, the entire assembly is installed in a printing press such as the apparatus 16 and a fluid such as air, hydraulic fluid or the like is admitted into the bore 56 through a suitable fitting attached to the left hand end of the shaft 46.
  • a suitable fitting attached to the left hand end of the shaft 46.
  • This fitting is required to maintain the connection fluid tight while rotating, there being many such fittings known in the art.
  • Such a fitting is indicated at 57, connected by line 59 to the fluid source 61.
  • the fluid is carried in the annular space between the central cylinder 66 and the sleeve 10 and it serves to maintain the sleeve 10 fully inflated and rigid during use.
  • the presence of the inner sleeve enables a very small amount of fluid to be used to maintain the rigidity of the sleeve 10, and in the case of air or other gas being the fluid, the amount of pressure needed to maintain the inflated condition is lower than it would be if the shaft extended fully through the device and there was no cylinder 66.
  • the cylinder 66 functions to maintain the spacing between the discs 50 and 70 and to keep the shafts 46 and 48 in alignment and rotating together.
  • the entire assembly is included in the term "framework" is used.
  • the internal pressure needed for keeping the cylinders inflated on a printing press is so low that readily available air pressure form commercial sources commonly provided in shops and factories will suffice. Further, since the method of transfer of ink to the substrate requires no mechanical pressure in the preferred structure in which the cylinders will be used, mechanical tension alone will be adequate to maintain the cylinders in their normal configuration in many instances.
  • FIG. 5 Two other forms of the invention are illustrated, respectively in Figures 5 and 6, but the principals of construction and operation are basically the same for all of the cylinder supporting devices including that of Figure 4.
  • Each has means for clamping or seizing the ends of the cylinder 10 in a fluid tight connection while shaping the same to form the cylindrical configuration, each has means for admitting a fluid to the interior of the cylinder to inflate it if required but at least to maintain it in rigid cylindrical configuration, and each has means for mounting the device onto a printing press.
  • the mounting devices 90 of Figure 5 differs primarily from that of Figure 4 in that the ends of the cylinder are held in place by pneumatic or hydraulic expandable cushions.
  • the right hand shaft 93 has a single bore 96 which connects to one or more radial passageways 98 in the washer end 100 of the cylinder 94 leading to the interior of an inflatable elastomeric cushion 102 clamped to the end of the cylinder 94 by suitable bands 104.
  • the securement can be effected by room temperature vulcanizing adhesive or other adhesive.
  • a similar cushion 106 shown in deflated condition is provided on the left hand end of the cylinder 94, since this end is shown in condition while it is being assembled.
  • the shaft 92 differs from the shaft 93 and that of Figure 4 in that it has concentric passageways, there being a central bore or pipe 108 and a large telescoping second bore 110, these being located within one another and being independent of one another.
  • the central passageway formed by the bore 108 is connected through a fitting 112 by way of a short length of conduit 114 through the interior of the cylinder 94 to a lateral opening 116 to which it is connected by a suitable fitting 118.
  • the outer bore 110 connects to one or more radial passageways 120 leading to the interior of the cushion 106.
  • Assembly is effected by moving the end cup- shaped discs 122 and 124 into telescoping engagement with the cylinder 10 taking up on the nuts 126 and 128, introducing a first fluid into the bores 96 and 108 to inflate the cushions 104 and 106 to clamp the sleeve 10 in place and thereafter introducing a second fluid into the interior pipe 108 to maintain the sleeve 10 as a rigid cylinder.
  • the second fluid is held between the inner cylinder 94 and the interior of the sleeve 10. Shaft packing is not deemed necessary in the device 90.
  • FIG. 6 there is illustrated a device 140 which utilizes an elastomeric boot of cylindrical configuration to maintain the sleeve 10 rigid so that no fluid will be engaged against the interior of the sleeve and so that it is not essential that the engagement of the sleeve 10 in the end discs be fluid tight.
  • this device there is again an inner rigid cylinder 142 connected with a pair of end stub shafts 144 and 146 upon which there are engaged the discs 148 and 150 by means of the nuts 152 and 154, respectively.
  • the cylinder 142 On the exterior of the cylinder 142 there is mounted an elongate elastomeric sleeve-like boot 156 whose ends are tight clamped to the exterior of the cylinder 142 by any suitable means such as the annular band 158 and 160.
  • the hollow bore 162 of the shaft 146 terminates axially within the cylinder 142 at 164 at which point it is connected by way of the conduits 166 connected at 168 to openings in the side wall of the cylinder 142, as for example at 170. Accordingly passage for fluid from the exterior of the cylinder 142 is provided by way of the bore 162 to the chamber 172 formed on the interior of the boot 156 and the outer surface of the cylinder 142.
  • the assembly of the device 140 and the method of inflation are easily effected since everything may be in place at one end, say the right hand end, the sleeve 10 slipped in place into the cup of the disc 150 while no fluid is present, the second disc 148 telescopically engaged over the left hand end of the sleeve, the nut 152 screwed home and fluid applied. This inflates the boot 156 and rigidifies the sleeve 10. This will form a rather firm base for the sleeve 10 during use.
  • a modified embodiment of the invention is designated generally by reference character 300 and comprises a central hollow shaft 312 of metal having a plurality of lateral passageways 313 for air.
  • Other fluids may be used, but for convenience only air will be referred to hereinafter because it is most convenient to use the same in printing establishments.
  • the ends of the central shaft 312 are closed off by plugs 314 and 316 to which the shaft is welded as indicated at 318 and 320, respectively.
  • a flanged disc is connected to each of these plugs by suitable means, the disc 322 being shown on the left and the disc 324 on the right.
  • These discs 322 and 324 are identical and their construction and functions will be explained in detail later.
  • the plugs 314 and 316 are generally cylindrical and that each of the discs 322 and 324 includes a hollow cylindrical hub shown at 326 and 328 which telescopically engages the respective plugs 314 and 316 on the exterior thereof, airtight connection being maintained by suitable packing such as O-rings 330.
  • the discs 322 and 324 include internal radial strengthening ribs 332 and 334 integral with the web or body of each disc, the latter being imperforate to retain the air pressure which is to be maintained on the interior of the device 300.
  • the structures at opposite ends of the shaft 312 are different. These represent embodiments of the invention capable of being used together or separately.
  • the structure at the left hand end may be used solely or duplicated at the right hand end; the structure at the right hand end may be used solely or duplicated at the left hand end; one of each structure may be used together at opposite ends.
  • the plug 314 has a cylindrical axial recess formed in its outer end at 336 and a coaxial socket 338 in the center of the recess 336 in which there is disposed a simple air valve 340 of the so-called Schraeder type which communicates by way of the passageway 342 with the interior 344 of the hollow shaft 312.
  • the shaft has the lateral passageways 313 by means of which the outer annular chamber 346 and the inner chamber 344 are in communication.
  • a thin metal sleeve 348 of electrodeposited nickel or the like with an outer photoconductive coating is adapted to be clamped into cylindrical configuration on the device 300 and maintained in inflated condition by air pressure. This is effected by introducing air under pressure by way of the valve 340 into the chamber 344.
  • the disc 322 has an inwardly directed radial flange 349 which is engaged over the axial end of the plug 314 and provided with perforations and threaded sockets to aid in the assembly of the device.
  • perforation in alignment with each of the ribs 322 thus providing six equally spaced perforations aligned with threaded sockets in the axial end of the plug 314.
  • One such perforation is indicated at 350 and a threaded socket at 352.
  • the centering flange member 356 has a central spigot 358 which is cylindrical on its exterior to fit into the recess 336 and is tapered on the interior as indicated at 360 and provided with a keyway at 362. There is also a radial flange portion 363 overlying the flange 349.
  • the member 356 has the aligned perforations in the flange portion 363 for the screw 354 but in addition has several other perforations 364 which are intended to be aligned with threaded sockets 366 formed in the flange 349 to receive other machine screws 368 that pass through the flange portion 363.
  • FIG 9 is an enlarged view of the outer section of the disc 322, there is an annular thickened rim 370 which has an interior (on the right hand face) axially extending annular seat or groove 372 formed fully around its circumference and coaxially centered.
  • annular thickened rim 370 which has an interior (on the right hand face) axially extending annular seat or groove 372 formed fully around its circumference and coaxially centered.
  • elastomeric ring 374 seated in the bottom (left hand end) of the groove 372, the ring 374 being provided with spaced passageways 376 aligned with perforations 378 provided in the rim 370 and opening to an external shallow furrow 380 provided on the exterior of the rim 370.
  • pressure ring 382 of cylindrical configuration which has a plurality of threaded studs 384 secured into its left hand axial end in spaced circumferential position to align with the passageways 376 and perforations 378.
  • the studs 384 extend through these passageways and perforations when the ring 382 is assembled to the disc 322 and are engaged by the nuts 386.
  • the assembly of the apparatus 300 with the sleeve 348 is effected, the sleeve 348 being easily slipped into place as the assembled disc 322, flange member 356 and ring 382, and properly positioned. Thereafter, taking up on the nuts 386 presses the ring 382 against the elastomeric ring 374 which expands in attempting to extrude out of the groove 372 thereby firmly clamping the sleeve 348 in place.
  • the same structure and procedure has been utilized in assembly of the right hand end of the device 300, it can be pumped up to a pressure of say about half an atmosphere through the use of the valve 340 and installed in the printing press.
  • the tapered socket 362 provides for centering and the keyway provides for positive driving of coupling of the device with suitable mechanical driving means associated with the printing press.
  • the right hand end of the device need not have a valve equivalent to the valve 340 but could have a blind end in the equivalent of the tapered socket 360 in the axial end of the plug 316. As a matter of fact, there need not be a second keyway at this location.
  • valve housing 390 set into the right hand plug 316 which has a port 392 leading to the chamber 344.
  • the movable valve 394 is seated at the right hand end of the chamber 396 by means of the 0- rings 398 against the axial intake port 400 and held there by a spring 402.
  • the spring 402 is of a strength to maintain any pressure which is in the chamber 344 and 346 if the device 300 is removed from a press in which it is installed.
  • the stem 404 of the valve member 406 pushes the valve 394 off its seat and holds the port 400 open.
  • the valve member 406 has a coaxial passageway and itself is slidable in the port 400, being kept air tight therein by suitable 0- rings. Its external face 410 has O-rings to enable it to make a frictional and air tight connection with a fitting that can supply external air pressure to the device 300.
  • the fitting is not shown in Figure 7 but is symbolized by the fitting 412 in Figure 10 as a rotary air connection.
  • the spring 402 keeps the valve member 406 in engagement with the fitting 412.
  • a printing press is shown diagrammatically having the device 300 installed therein, the structure being such as to utilize an external source of pressure.
  • the other device of the invention previously described may be utilized so long as they utilize an external source of pressure.
  • the device 300 is shown mounted on the frame 414 of a printing press 416, only a very small part of which is diagrammed.
  • the substrate in the form of a web of paper 418 is being guided through the press 416 and may pass over idler and drive rollers, an idler roller being indicated at 420 and a drive roller being indicated at 422, mounted to the frame 414.
  • the press drive 424 may be mechanical, electrical, pneumatic or a combination of these, suitably controlled as customary with modern printing presses.
  • the mechanical drive extending to the several rotary parts is indicated by the broken lines 426.
  • a pressure source is shown at 428 supplying pressure to the fitting 412 by way of the pressure regulator 430 and the air line 432 and 434.
  • the exact pressure within the sleeve 348 will be controlled by the pressure regulator 430 whose set value may be established manually as by a control 436 or may be varied automatically for certain purposes by way of the line 438.
  • the pressure switch 440 is sensitive to sudden changes in the pressure in the line 434, being connected to the line 434 by a conduit 442. A large hole suddenly occurring in the sleeve 348 or the bursting thereof will cause a sudden dropping of pressure in the chamber 346. The drop will be experienced by the line 434 and the regulator will attempt to equalize the pressure. This radical change sensed by the switch 440 can be made to operate the switch to turn off the press drive and prevent damage.
  • Slight air leaks in the chamber 346 can be taken care of by the regulator 430 as a routine matter.
  • the press 416 will normally have some form of transducer system (not shown) to indicate registration of multiple impressions and a signal from such system can be picked up and transmitted by a line, electrical or pneumatic, as shown at 444 to a sensor 446.
  • This sensor 446 may in turn provide a signal which operates a register adjusting device 448 which is nothing more than an automatic adjustment for the set point of the pressure regulator. It has been found that since the sleeve 448 is made out of metal that is very thin, it is capable of being inflated slightly beyond its normal diameter by a small amount, say a few thousandths of a millimeter. Registration can be affected by this means, to augment ordinary registration control means rather than to replace the same.
  • the pressure adjustment effected by the register adjust device 448 is applied to the pressure regulator 430 by way of the line 438.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rotary Presses (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Claims (27)

1. Verfahren zum Befestigen einer langgestreckten, biegsamen, dünnwandigen Metallhülse auf einem Gestell zur Verwendung in einer Rotationsdruckmaschine, umfassend die Schritte, die darin bestehen, dass ein drehbares Gestell vorgesehen wird, das Mittel zum Verformen der Hülse zu einem Zylinder besitzt, dass die Hülse auf das Gestell aufgezogen und an den Enden dicht verschlossen wird, dass die Enden gegen eine axiale Bewegung festgeleft werden und dass die Innenwandung der Hülse derart mit Druckmitteldruck beaufschlagt wird, dass die Hülse unter der Wirkung eines an allen Stellen der Länge ihrer Innenwandung gleichen Innendrucks aufgeweitet wird, dadurch gekennzeichnet, dass die Enden der Hülse gegen die Innenseite je einer zylindrischen Fläche gespannt und dadurch zu Kreisen verformt werden.
2. Befestigungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Hülse in ihrer zwischen ihren Enden verbleibenden Länge abstützungsfrei ist.
3. Befestigungsverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Innenwandung der Hülse direkt mit dem Druckmitteldruck beaufschlagt wird.
4. Befestigungsverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Innenwandung der Hülse indirekt mit dem Druckmitteldruck beaufschlagt wird, indem ein aufweitbarer Körper in die Hülse eingeführt und unter Druck stehendes Druckmittel in den aufweitbaren Körper eingeführt und dadurch die Innenwandung der Hülse mit einem Druck beaufschlagt wird, der zum Starrmachen der Hülse genügt.
5. Druckvorrichtung mit einer Abstützung für eine als Einrichtung zum Übertragen von Druckfarbe dienende, undurchlöcherte, dünnwandige Metallhülse, die im abstützungsfreien Zustand biegsam und form bar ist, umfassend
A. ein langgestrecktes Gestell mit Wellenmitteln (46, 48; 92, 93; 144, 146; 312, 314, 316), deren entgegengesetzte Enden zum Verbinden des Gestells mit einer Druckmaschine zum Drehen des Gestells geeignet sind, mit an je einem Ende des Gestells vorgesehenen Scheiben (50, 70; 122, 124; 148, 150; 322, 324), die mit je einem der Wellenenden verbunden sind und die mit je einem Ende einer dünnwandigen Metallhülse (10; 348) kuppelbar sind, die dadurch Kreisform erhält, und mit einem sich zwischen den Wellenenden axial erstreckenden Abstandhalter (66; 94; 142; 312), der die Scheiben in einem festen Abstand voneinander hält und diesen Abstand im Gebrauch der Vorrichtung aufrechterhält.
B. wobei der sich axial erstreckende Abstandhalter eine solche Länge hat, dass er im Zusammenwirken mit den Scheiben die Hülse zu einem Zylinder verformt, und
C. Mittel (56, 60, 62; 108; 114, 116, 118; 162, 166; 406, 392, 344, 313) zum Beaufschlagen der Innenwandung der Hülse mit einem an allen Stellen der gesamten Fläche der Hülse zwischen den genannten Enden gleichen Druck, um im Gebrauch der Vorrichtung die zylindrische Form der Hülse aufrechtzuerhalten,

dadurch gekennzeichnet, dass die beiden Enden der Hülse gegen das Innere je einer zylindrischen Fläche gespannt und dadurch zu Kreisen verformt werden.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die sich axial erstreckenden Abstandhaltemittel einen Langgestreckten, starren Zylinder (66; 94; 142; 312) umfassen, dessen Außendurchmesser kleiner ist als der Innendurchmesser der in der Vorrichtung abstützbaren Hülse (10; 348), so dass zwischen der Außenfläche des starren Zylinders und der Innenwandung der eingesetzten Hülse ein zylindrischer Raum (172; 346) vorhanden ist, der mit dem genannten Druck beaufschlagt wird, und die Hülse im Gebrauch auf dem größten Teil ihrer Länge mechanisch unabgestützt ist.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Mittel (56, 60, 62; 108; 114, 116, 118; 162, 166; 406, 392, 344, 313) zum Druckbeaufschlagen Mittel zum Einleiten von unter Druck stehendem Druckmittel in das Gestell und zum Übertragen des Druckes in den zylindrischen Raum (172; 346) bei eingesetzter Hülse (10; 348) umfassen.
8. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Mittel (56, 60, 62; 108; 114, 116, 118; 162, 166; 406, 392, 344, 313) zum Druckeinleiten mindestens einen die Wellenmittel (44, 48; 92, 93; 144, 146, 312, 314, 316) durchsetzenden Kanal (56; 108; 162; 408) und zwischen dem Kanal und dem Innenraum der Hülse (10; 348) vorgesehene Verbindungsleitungsmittel zum Druckbeaufschlagen der Innenwandung der Hülse umfassen.
9. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Mittel (56, 60, 62; 108; 114, 116, 118; 162, 166; 406, 392, 344, 313) zum Druckeinleiten mindestens einen die Wellenmittel durchsetzenden Kanal (408) und Mittel (59; 430, 432, 434) zum Herstellen einer Verbindung zwischen dem Kanal und einer externen Quelle (61; 428) von unter Druck stehendem Druckmittel umfassen.
10. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass mit dem starren Zylinder (142) eine allgemein zylindrische, aufweitbare Hülle (156) dicht verbunden ist und dass die Mittel (162, 166) zum Druckbeaufschlagen eine Leitung zum Einleiten von Druckmittel in das Innere der Hülle umfassen, um diese bis zum Angriff an der Innenwandung der Hülse (10) auszudehnen.
11. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Zylinder (94) an seinen entgegengesetzten Enden mit je einem Polster (104, 106) versehen ist, die bis zum Angriff an den Enden der Hülse (10) aufweitbar sind, um die Hülsenenden zwischen dem starren Zylinder und der Welle (92, 93) dicht abzuschließen und einzuspannen, und dass die Welle (92, 93) eine erste Kanalanordnung (96, 98) zum Einleiten eines ersten unter Druck stehenden Druckmittels in das Innere der Polster besitzt.
12. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass in dem Gestell eine aufweitbare Hülle (156) koaxial angeordnet und im Innern der Hülse (10) teleskopartig vorgesehen und an ihren Enden dicht verschlossen ist und dass eine Einrichtung (162, 166) vorgesehen ist, die zum Einleiten des Druckmittels ins Innere der Hülle dient, um diese gegen die Innenwandung der Hülse aufzuweiten.
13. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Welle von mindestens einem mit ihr koaxialen Kanal (56; 108; 1062; 392) durchsetzt ist, dessen inneres Ende sich im Innenraum der Hülse (10, 348) under dessen äußeres Ende sich am einen Ende der Wellenmittel befindet, dass die Hülsenenden hermetisch gekuppelt sind und dass eine Einrichtung zum Zuführen von unter Druck stehendem Druckmittel von der Außenseite des Gestells zu einem Ende der Wellenmittel und in den Kanal vorgesehen ist.
14. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Enden des Zylinders (66) mit sie abschließenden Ringscheiben (64, 68) versehen sind, mit denen die Wellenmittel (46, 48) koaxial sind dass die Scheiben (50, 70) auf den Wellenmitteln montiert sind und dass das Druckmittel auf der Außenseite des Zylinders an diesem vorbeigeführt wird.
15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass die Scheiben (50, 70) axial einwärtsgerichtete Ringflansche (52, 78) besitzen und die Hülse (10) auf der Innensiete der Flansche befestigbar ist.
16. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass die Welle (92, 93) von den ersten Kanalmitteln (96, 98) unabhängige, zweite Kanalmittel (108, 114, 116, 118) besitzt, über die bei eingesetzter Hülse (10) zu deren Aufweiten ein zweites unter Druck stehendes Druckmittel in den Ringraum eingeleitet werden kann.
17. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass eine Einrichtung zur drehbaren Lagerung der Vorrichtung vorgesehen ist, ferner eine externe Quelle (61; 428) eines unter Druck stehenden Druckmittels und eine Einrichtung (57) zum Herstellen einer drehbaren Druckmittelkupplung zwischen der externen Quelle des unter Druck stehenden Druckmittels und dem genannten Innenraum zu dessen Beaufschlagung mit Druckmitteldruck während einer Drehung.
18. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das langgestreckte Gestell einen starren hohlen Zylinder (66) umfaßt, der an seinen Enden ihn abschließende Ringscheiben (64, 68) besitzt, dass die Enden (44, 48) der Wellenmittel mit je einer der Ringscheiben verbunden sind und sich von dem Zylinder axial auswärts erstrecken, dass an den Wellenenden eine Kupplung zur drehbaren Verbindung mit der Druckmaschine vorgesehen ist, dass das Gestell an beiden Enden des Zylinders je eine Scheibe (50, 70) besitzt, die mit je einer der Wellen verbunden und mit dem Gestell drehbar sind, dass jede der Scheiben an ihrem Umfang einen sich axial erstreckenden, relativ kurzen Ringflansch (52, 78) besitzt, dass die Flansche und die Sheiben zueinander hin offene, topfartige Gebilde darstellen, deren Innendurchmesser größer ist als der Außendurchmesser des Zylinders, dass mindestens eine der Scheiben relativ zur der andern axialbewegbar und in einer vorherbestimmten Axialstellung festlegbar ist, dass die topfartigen Gebilde mit je einem Ende der Hülse (10) kuppelbar sind, um dieses zu einem Kreis zu verformen, so dass bei in Stellung befindlicher Hülse die Stellung der bewegbaren Scheibe relativ zur der anderen Scheibe und zu dem Zylinder festgelegt ist und die Hülse einen den ersten Zylinder koaxial umgebenden, zweiten Hohlzylinder bildet, dass eine Quelle (61) eines unter Druck stehenden Druckmittels vorgesehen ist und dass mindestens ein Ende der Wellenmittel einen Kanal besitzt, der axial auswärts von den Zylindern von den Wellenmitteln zu einem zwischen den Zylindern befindlichen Raum führt.
19. Vorrichtung nach Anspruch 18, dadurch gekennzeichnet, dass bei derart befestigter und gekuppelter Hülse (10) ein die Welle (46) durchsetzender Kanal (56), eine externe Quelle (61) eines unter Druck stehenden Druckmittels und eine Verbindung zwischen der genannten Quelle und dem Kanal intern mit dem Innenraum der Hülse in Verbindung stehen.
20. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass jede Scheibe (50, 70; 122, 124; 148, 150; 322, 324) an ihren Enden dicht befestigt und mit je einem Ende der Hülse (10; 348) gekuppelt ist und dass bei derart gekuppelter Hülse zwischen deren Enden Keine mechanische Abstützung für de Hülse vorgesehen ist.
21. Vorrichtung nach einem der Ansprüche 5 bis 20, dadurch gekennzeichnet, dass die Enden der dünnwandigen Metallhülse (10; 348) im gestreckten Zustand derselben mit den Scheiben (50, 70; 122, 124; 148, 150; 322, 324) verklebt sind.
22. Vorrichtung nach einem der Ansprüche 5 bis 21, dadurch gekennzeichnet, dass die Hülse (10; 348) außen mit einem aus einem dünnen Film bestehenden Überzug aus einem mikrokristallinen, flexiblen photoleitenden Material versehen ist.
23. Vorrichtung zum Abstützen einer undurchlöcherten, dünnwandigen Metallhülse, die im unabgestützten Zustand flexibel und faltbar ist, zur Verwendung als Druckfarbenübertragungseinrichtung in einer Druckmaschine oder dergleichen, gekennzeichnet durch:
A. eine langgestreckte Hohlwelle (312), die an entgegengesetzten Enden je einen Stöpsel (314, 316) besitzt und deren Wand zwischen den Enden der Welle von Querkanälen (313) durchsetzt ist,
B. wobei jeder der Stöpsel eine Einrichtung besitzt, die es ermöglicht, dass die Vorrichtung herausnehmbar mit einer Druckmaschine gekuppelt und von deren Antrieb um eine von der Achse der Hohlwelle bestimmten Achse gedreht wird,
C. mit je einem der Stöpsel verbundene, mit det Welle koaxiale, undurchlöcherte Scheiben (322, 324), von denen jede auf ihrer Fläche radial einwärts von ihrem Außenrand mit einer Umfangsnut (372) ausgebildet ist, deren Durchmesser beträchtlich größer ist als der Außendurchmesser der Hohlwelle, wobei die Nuten einander axial zugekehrt sind und Sitze für die Enden der dünnwandigen Metallhülse (348) bilden, die in die Nuten einsetzbar ist und sich zwischen den Scheiben im Abstand auswärts von der Hohlwelle erstreckt,
D. in je einer der Nuten angeordnete, elastomere O-Ringe (374) und in je eine der Nuten axialbewegbare Halteringe (382), die an den O-Ringen angreifen und sie in die Nuten drücken können, um die Enden der dünnwandigen Hülse in den entsprechenden Nuten einzuspannen und zu mit der Welle koaxialen Kreisen zu verformen,
E. wobei die Vorrichtung eine Abstützung der derart eingesetzten Hülse zwischen deren eingespannten Enden nur durch Druckmitteldruck ermöglicht,
F. Mittel zum Festlegen (384, 386) der Halteringe in ihrer Spannstellung und
G. ein in wenigstens einem der Stöpsel vorgesehenes Ventil (406) zum Einlassen von unter Druck stehendem Druckmittel in den Innenraum der in der angegebenen Weise in der Vorrichtung befestigten Hülse, wobei das Ventil zum Halten des Druckmitteldrucks in der Vorrichtung geeignet ist.
24. Vorrichtung nach Anspruch 23, dadurch gekennzeichnet, dass das Ventile (406) geöffnet werden kann, um bei in einer Druckmaschine montierter und rotierender Vorrichtung diese mit einer externen Druckwelle zu verbinden.
25. Vorrichtung nach Anspruch 24, dadurch gekennzeichnet, dass das Ventile (406) so eingerichtet ist, dass es beim Herausnehmen der Vorrichtung aus der Druckmaschine schließt, aber den Druck hält.
26. Vorrichtung nach Anspruch 25, dadurch gekennzeichnet, dass die Mittel zum Festlegen der Halteringe Schrauben (384, 386) umfassen, welche die Scheiben (322, 324) von deren Außenflächen her durchsetzen und im Innern der Nuten (372) an den Klemmringen (382) angreifen.
27. Vorrichtung nach Anspruch 26, dadurch gekennzeichnet, dass die Einrichtung zum Kuppeln der Vorrichtung mit einer Druckmaschine in je einem der Stöpsel (314, 316) ausgebildete und mit der Welle koaxiale verjüngte Aufnahmen (360) besitzt, von denen mindestens eine mit Keilmitteln (362) versehen ist und die mit der Druckmaschine verbundene Steckerteile aufnehmen können, wobei mindestens die mit Keilmitteln versehene Aufnahme einen drehbaren Steckerteil aufnehmen kann.
EP19780101857 1977-12-27 1978-12-27 Verfahren zum Aufbau von Druckzylindern mit flexiblem, metallischem Zylindermantel und Kopiergerät mit einem derartigen Druckzylinder Expired EP0003051B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86433277A 1977-12-27 1977-12-27
US864332 1977-12-27

Publications (2)

Publication Number Publication Date
EP0003051A1 EP0003051A1 (de) 1979-07-25
EP0003051B1 true EP0003051B1 (de) 1982-01-20

Family

ID=25343040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780101857 Expired EP0003051B1 (de) 1977-12-27 1978-12-27 Verfahren zum Aufbau von Druckzylindern mit flexiblem, metallischem Zylindermantel und Kopiergerät mit einem derartigen Druckzylinder

Country Status (5)

Country Link
EP (1) EP0003051B1 (de)
JP (1) JPS54130208A (de)
AU (1) AU528151B2 (de)
CA (1) CA1120327A (de)
DE (1) DE2861569D1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589230Y2 (ja) * 1979-11-26 1983-02-19 コニカ株式会社 記録体保持装置
DE3021050A1 (de) * 1980-06-04 1981-12-10 Hoechst Ag, 6000 Frankfurt Vorrichtung zum abtragen von entwicklerfluessigkeit von einem aufzeichnungsmaterial
JPS5782879A (en) * 1980-11-12 1982-05-24 Mita Ind Co Ltd Photosensitive drum of electrostatic copier
JPS5886584A (ja) * 1981-11-19 1983-05-24 Konishiroku Photo Ind Co Ltd ドラム状像担持体部材
JPS59156812U (ja) * 1983-04-06 1984-10-22 株式会社デンソー 自動車用空調装置の通風ダクト
JPS6175767A (ja) * 1984-09-14 1986-04-18 Nobuyuki Hirohata ロ−ル
DE3612004C1 (de) * 1986-04-09 1987-09-10 Triumph Adler Ag Schreibwalze fuer Schreib- oder aehnliche Maschinen
US5415961A (en) * 1992-09-29 1995-05-16 Xerox Corporation Flexible belt supported on rigid drum for electrophotographic imaging
GB2283457B (en) * 1993-07-30 1996-06-26 Bestplate Limited Printing apparatus
US5413810A (en) * 1994-01-03 1995-05-09 Xerox Corporation Fabricating electrostatographic imaging members
US5443785A (en) * 1994-01-03 1995-08-22 Xerox Corporation Method of treating seamless belt substrates and carriers therefor
US5709765A (en) * 1994-10-31 1998-01-20 Xerox Corporation Flexible belt system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986466A (en) * 1955-12-06 1961-05-30 Edward K Kaprelian Color electrophotography
NL291410A (de) * 1962-04-11
AT299266B (de) * 1967-07-26 1972-06-12 Johannes Zimmer Druckzylinder
US3695757A (en) * 1969-02-27 1972-10-03 Xerox Corp Xerographic plate
DE2021409C3 (de) * 1970-04-30 1980-04-10 Agfa-Gevaert Ag, 5090 Leverkusen Elektrostatisches Kopiergerät mit einer auswechselbaren Kopiertrommel
CH585352A5 (en) * 1976-04-20 1977-02-28 Ciba Geigy Ag Pressing or crushing roll for paper or textiles processing - comprising chamber for pressurised fluid between supporting core and flexible jacket

Also Published As

Publication number Publication date
CA1120327A (en) 1982-03-23
AU4313879A (en) 1979-07-05
EP0003051A1 (de) 1979-07-25
JPH0423271B2 (de) 1992-04-21
JPS54130208A (en) 1979-10-09
DE2861569D1 (en) 1982-03-04
AU528151B2 (en) 1983-04-14

Similar Documents

Publication Publication Date Title
EP0003051B1 (de) Verfahren zum Aufbau von Druckzylindern mit flexiblem, metallischem Zylindermantel und Kopiergerät mit einem derartigen Druckzylinder
US4656942A (en) Printing apparatus utilizing flexible metal sleeves as ink transfer means
US4217821A (en) Printing apparatus utilizing flexible metal sleeves as ink transfer means
JP4578718B2 (ja) 文書印刷機／複写機用の像転写ドラム
US5813336A (en) Printing unit with axially removable printing sleeves
US4651643A (en) Adaptors for use with printing cylinder mandrels
US5215013A (en) Printing blanket with noise attenuation
US5151737A (en) Photoconductive drum having expandable mount
US5072504A (en) Method for axially mounting and dismounting rigid sleeves onto, and from, cylinders
US2468400A (en) Porous printing cylinder
US4147312A (en) Gas-liquid hydraulic expandable chucks and shafts
US4272872A (en) Device for holding a thin-walled metal cylinder
US5402721A (en) Vacuum printing plate roller
JPH091774A (ja) 回転式印刷胴用同心二重版円筒
KR910004354A (ko) 두루마리용지 이송식 로타리 인쇄기
US3166013A (en) Expansible cylinder for rotary printing press
US20040079250A1 (en) Adapter sleeve, especially for printing presses
US3989202A (en) Apparatus for winding and unwinding a band
CA1116228A (en) Bearing arrangements
SU816393A3 (ru) Барабан к устройству дл сборки ифОРМОВАНи пОКРышЕК пНЕВМАТичЕСКиХ шиН
KR20100031657A (ko) 팽창식 벨트 맨드릴
US4111569A (en) Shell and shaft subassembly
US5062193A (en) Method for mounting and dismounting rigid sleeves onto and from a cylinder
US5046231A (en) Device for mounting and dismounting rigid expandable sleeves
US7171147B2 (en) Double-sleeved electrostatographic roller

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

AK Designated contracting states

Designated state(s): DE FR GB NL SE

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB NL SE

REF Corresponds to:

Ref document number: 2861569

Country of ref document: DE

Date of ref document: 19820304

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19921111

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19921113

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19921124

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19921231

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930830

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19931227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19931228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19931227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 78101857.7

Effective date: 19940710

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