EP0761435A1 - Dispositif pour enrouler un support d'image flexible autour un cylindre de forme - Google Patents

Dispositif pour enrouler un support d'image flexible autour un cylindre de forme Download PDF

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Publication number
EP0761435A1
EP0761435A1 EP95116776A EP95116776A EP0761435A1 EP 0761435 A1 EP0761435 A1 EP 0761435A1 EP 95116776 A EP95116776 A EP 95116776A EP 95116776 A EP95116776 A EP 95116776A EP 0761435 A1 EP0761435 A1 EP 0761435A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
image carrier
printing form
form cylinder
printing
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
Application number
EP95116776A
Other languages
German (de)
English (en)
Other versions
EP0761435B1 (fr
Inventor
Gotthard Schmid
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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
Priority claimed from DE19536884A external-priority patent/DE19536884C1/de
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0761435A1 publication Critical patent/EP0761435A1/fr
Application granted granted Critical
Publication of EP0761435B1 publication Critical patent/EP0761435B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/125—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end on a curvilinear path, e.g. by winding on a roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/06—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching of endless or like continuously-fed coverings

Definitions

  • the invention relates to a device for wrapping a printing form cylinder with a flexible print image carrier, wherein a first winding spool for handling a print image carrier that can be pulled onto the outer surface of the printing form cylinder and a second winding spool for winding the printed image carrier mounted on the outer surface are provided in the interior of the printing form cylinder are and on the printing form cylinder in its outer surface a single opening to a pit is formed in its interior, in which the first and the second winding spool are arranged together and from which the printed image carrier can be wound from the first winding spool onto the outer surface and from this onto the second winding spool is.
  • a drum for a copying machine is known from the prior art, US Pat. No. 4,231,652, in the interior of which two coils - a supply and a take-up spool - are received, which transport a web-shaped semiconductor material.
  • the drum together with the winding coils stored in it can be removed from the storage in that levers opposite the end faces of the drum are positively connected to pins which can be pulled out of the end face bores of the drum and retracted into them.
  • the pins can be moved axially by means of the pivotable levers; after the pins have released the front holes, the drum rests on support pins attached to the side walls.
  • DE 43 03 872 A1 shows a printing device with a forme cylinder and a method for preparing for printing the forme cylinder.
  • the forme cylinder is divided into two segments which are connected to one another in a form-fitting manner.
  • the winding spools that accommodate the print image carrier are housed in the upper segment.
  • removal of the winding spools when the supply spool is exhausted is possible either through the end face of the forme cylinder or a complete disassembly of the upper segment is required.
  • removal of the segment accommodating the winding spool in the machine appears to be cumbersome and difficult to carry out; Removal of the winding spools through the end faces makes it necessary to remove the forme cylinder from the machine.
  • the object of the invention is to improve the serviceability of a printing form cylinder storing a spoolable print image carrier and to minimize the downtimes.
  • An advantage of the solution according to the invention is the fact that the printing form cylinder can remain in the installed state in the machine during maintenance work.
  • the rewinding mechanism including the winding shafts can be removed in a simple manner through the peripheral opening in the lateral surface. After they have been removed, the bearing part supporting the winding shafts can be removed from the cylinder interior in a simple manner, as a result of which the entire interior of the cylinder is freely accessible for maintenance work through the peripheral opening. This will make one Dismantling of the printing form cylinder is unnecessary. This fact further drastically reduces the risk of damage or misalignment of the imaging units placed close to the surface of the printing form cylinder. In contrast, a dismantling and subsequent assembly of the printing form cylinder would make it necessary to readjust the imaging units. This necessary, but undesirable downtime can now also be dispensed with.
  • the mounting part is arranged in the region of one of the end faces of the printing form cylinder.
  • the storage part supports the first and the second winding spool of the rewinding mechanism for the print image carrier in the interior of the printing form cylinder by the storage part.
  • the bearing part can be fastened to one of the cylinder end parts, the winding spools being received in the bearing part and on the other hand in this opposite cylinder end part.
  • the bearing part and the cylinder end part serving to receive the winding spool are provided with openings for receiving the winding spools.
  • integrated bearer rings are provided in the cylinder end parts of the printing form cylinder, the running surfaces of which extend next to the outer surface of the printing form cylinder.
  • a printing form cylinder 1 shows a printing form cylinder 1 with a circumferential opening 2 in its lateral surface 9.
  • a rewinding mechanism 4 is accommodated, which comprises winding spools 5 and 6.
  • winding spools 5 and 6 one of which holds a supply of the printed image carrier 3, while the other serves to receive the printed image carrier section which has been unwound from the lateral surface 9, that is to say used, the printed image carrier 3 is also transported again to the lateral surface 9 of the printing form cylinder 1 to be directly illustrated on it.
  • the imaging units themselves are not the subject of the present invention; they should only be mentioned to the extent that they are to be positioned correctly on the surface of the printing form cylinder 1 in order to ensure correct imaging of the print image carrier 3 located on the lateral surface 9. It is important to maintain the correct setting of the imaging units on the surface of the print image carrier 3 when carrying out maintenance work on the printing form cylinder 1.
  • a storage part 30 accommodates the winding spools 5 and 6 which serve to advance the print image carrier.
  • the printed image carrier 3 is guided over curves 7, 8 which delimit the channel opening 2 in the lateral surface 9.
  • FIG. 2 shows a printing form cylinder in a conventional design with spindle holders arranged on the end outside of the cylinder and removable in the axial direction.
  • spindle shafts 14 are received in the first spindle holder.
  • Each of the spindle shafts 14 is provided with a toothed segment 12, 13, by means of which the two winding spools 5, 6 for the printed image carrier 3 can be locked simultaneously. All that is required is the actuation of the first segment 12.
  • the spindle shafts 14 each hold compression springs 15 which are penetrated by a bolt 16.
  • the bolts 16 in turn have removable spindle heads 17, which in turn fix the ends of the winding coils 5 and 6.
  • a second spindle holder 18 is provided, which can also be removed from the printing form cylinder 1 only from the outside.
  • the second spindle holder 18 receives both a gear 19 and a ratchet wheel 20, which cooperates with a pawl 21, which in turn is biased by a spring 22.
  • FIG. 2 shows the parts of the rewinding mechanism 4.
  • the spindle holder 18 To replace the parts of the rewinding mechanism 4, the spindle holder 18 must be removed outside the machine. Parts 12 to 17 are can be removed through the peripheral opening 2 without removing the spindle holder 22.
  • the printing form cylinder 1 comprises a first cylinder end part 26 and a second cylinder end part 28, between which a middle piece 23 is screwed, which contains a peripheral opening 2.
  • a pin 27 or 29 is formed on each of the cylinder end parts 26 and 28, through which the printing form cylinder 1 is mounted in the machine.
  • a bearing part 30 is arranged on one of the cylinder end faces 26 or 28 - here on the second cylinder end part 28. This mounting part 30 is provided with openings which accommodate components of the rewinding mechanism 4 shown in more detail in FIG.
  • the bearing part 30 can be connected to the second cylinder end part 28, for example, via a screw connection 31. If the print image carrier supply on one of the winding spools 5, 6 is exhausted, these are moved away from the spindle heads 17 by rotating the toothed segments 12 and 13 and releasing the prestressing of the compression springs 15 and removed through the peripheral opening 2. In the event of service, the screw connection 31 between the bearing part 30 and the corresponding cylinder end part can then also be loosened through the peripheral opening 2; the bearing part 30, together with the components of the rewinding mechanism 4 accommodated thereon, can be removed from the inside of the printing form cylinder 1. In comparison, in the configuration shown in FIG. 2, it is necessary to dismantle the second spindle holder 18 from the outside, which necessitates removal of the printing form cylinder 1 from the machine.
  • the bearing part 30 can of course also be accommodated on the first cylinder end part 26, in which case this cylinder end part would then have to be designed in accordance with the second cylinder end part 28.
  • the cylindrical end parts 26 and 28 each have integrated bearer rings 32 and 34. This one-piece design does not result in a joint, so that there is no tolerance problem in the surface treatment of the running surfaces 33 or 35. It is therefore possible to finish grinding the first cylinder end part 26 together with the tread 35 when the surface is finished.
  • the second cylinder end part 28 is to be machined analogously.
  • the treads 33, 35 and all other precision outer diameters are finished after assembly of the parts 23, 27 and 29. This guarantees perfect concentricity of these diameters to one another.
  • FIG. 4 shows a further variant of a winding spool bearing.
  • the winding spool 5 is shown in a position for removing the supply roll, while the winding spool 6 is shown in the position which it also assumes in operation.
  • first cylinder end part 26 of the printing form cylinder 1 shells 44 are mounted in the area of the winding spools 5, 6, which are each fastened to the first cylinder end part 26 with a screw connection 45.
  • the pin 27 of the printing form cylinder 1 is mounted in the side wall of the machine, which is not shown here, however, so that access to the first cylinder part 26 from the outside is made very difficult by the machine side wall.
  • the shells 44 mentioned are each penetrated by sleeves 37.
  • a cone 42 On the sleeves 37 there is a cone 42, one roller bearing and one toothed segment 38 and 39, respectively.
  • two pins 47 provided with a stop each take a compression spring 48.
  • the pin 47 serves as an abutment for the compression spring 48, which brings the cone 42 into the removal position for the coil 5.
  • the pin 47 is guided in the bore in the cylinder part 26; its axial displaceability is limited by the stop on the pin 47.
  • toothed segment 38 and 39 there is a toothed segment 38 and 39 on each of the sleeves 37.
  • the toothing of the two toothed segments 38, 39 serves to simultaneously lock the two coils 5 and 6 in the same way.
  • the two toothed segments 38, 39 are moved axially away from the shell 44 during rotation via axial curves, so that the coils 5 and 6 are tensioned.
  • the two toothed segments 38, 39 can also be placed on the part 44 by the axial curves. As a result, the coils 5 and 6 are relaxed, so that the coils 5 and 6 can be removed from the interior of the cylinder.
  • each cone 42 is provided with an internal thread 51, so that the cone 42 can be easily removed from the sleeves 37 after the winding spools 5 and 6 have been removed. Then the flat sides of the two pins 47 are exposed so that they can be rotated by means of a tool to be inserted into the pin thread 49, so that the pin thread 49 and the pin 47 can be removed from the first cylinder part 26.
  • the position of the winding spool 6 in the operating state is shown on the basis of the lower winding spool 6, also shown in FIG.
  • the spring 48 holds the sleeve 37 on the pin 47 in a prestressed position and thus fixes the winding spool 6 in the axial direction.
  • the spring 48 is tensioned.
  • the axial displacement of the sleeves 37 always takes place together; the toothed segments 38, 39 never come out of engagement, for reasons of a simplified representation, the upper sleeve 37 for the coil 5 is shown in a relaxed position in FIG. 5 and the lower sleeve 37 for the coil 6 is shown in the operating state.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP95116776A 1995-09-09 1995-10-25 Dispositif pour enrouler un support d'image flexible autour un cylindre de forme Expired - Lifetime EP0761435B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19533442 1995-09-09
DE19533442 1995-09-09
DE19536884 1995-10-04
DE19536884A DE19536884C1 (de) 1995-09-09 1995-10-04 Vorrichtung zur Umwicklung eines Druckformzylinders mit einem flexiblen Druckbildträger

Publications (2)

Publication Number Publication Date
EP0761435A1 true EP0761435A1 (fr) 1997-03-12
EP0761435B1 EP0761435B1 (fr) 1999-03-31

Family

ID=26018436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116776A Expired - Lifetime EP0761435B1 (fr) 1995-09-09 1995-10-25 Dispositif pour enrouler un support d'image flexible autour un cylindre de forme

Country Status (2)

Country Link
EP (1) EP0761435B1 (fr)
AT (1) ATE178270T1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231652A (en) 1977-12-17 1980-11-04 Develop Kg Dr. Eisbein & Co. Drum for electrophotographic copier
DE4303872A1 (de) 1992-04-24 1993-10-28 Roland Man Druckmasch Druckvorrichtung mit einem Formzylinder und Verfahren zur Druckvorbereitung des Formzylinders
DE4329125C1 (de) * 1993-08-30 1995-01-05 Heidelberger Druckmasch Ag Einrichtung zum Erneuern einer Druckfolie auf der Mantelfläche eines Formzylinders
DE29503401U1 (de) * 1994-09-15 1995-04-20 MAN Roland Druckmaschinen AG, 63075 Offenbach Formzylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231652A (en) 1977-12-17 1980-11-04 Develop Kg Dr. Eisbein & Co. Drum for electrophotographic copier
DE4303872A1 (de) 1992-04-24 1993-10-28 Roland Man Druckmasch Druckvorrichtung mit einem Formzylinder und Verfahren zur Druckvorbereitung des Formzylinders
DE4329125C1 (de) * 1993-08-30 1995-01-05 Heidelberger Druckmasch Ag Einrichtung zum Erneuern einer Druckfolie auf der Mantelfläche eines Formzylinders
DE29503401U1 (de) * 1994-09-15 1995-04-20 MAN Roland Druckmaschinen AG, 63075 Offenbach Formzylinder

Also Published As

Publication number Publication date
ATE178270T1 (de) 1999-04-15
EP0761435B1 (fr) 1999-03-31

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