EP0205880A2 - Dispositif d'aplanissement du bord avant d'une feuille dans le dispositif d'alimentation d'une rotative en feuilles - Google Patents

Dispositif d'aplanissement du bord avant d'une feuille dans le dispositif d'alimentation d'une rotative en feuilles Download PDF

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Publication number
EP0205880A2
EP0205880A2 EP86106491A EP86106491A EP0205880A2 EP 0205880 A2 EP0205880 A2 EP 0205880A2 EP 86106491 A EP86106491 A EP 86106491A EP 86106491 A EP86106491 A EP 86106491A EP 0205880 A2 EP0205880 A2 EP 0205880A2
Authority
EP
European Patent Office
Prior art keywords
sheet
bar
grippers
smoothing device
contact plate
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.)
Withdrawn
Application number
EP86106491A
Other languages
German (de)
English (en)
Other versions
EP0205880A3 (fr
Inventor
Hermann Fischer
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.)
Manroland AG
Original Assignee
MAN Roland 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
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0205880A2 publication Critical patent/EP0205880A2/fr
Publication of EP0205880A3 publication Critical patent/EP0205880A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/36—Article guides or smoothers, e.g. movable in operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/04—Grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/12—Adjusting leading edges, e.g. front stops

Definitions

  • the invention relates to a sheet smoothing device for the gripper edge of a sheet on the sheet system of a rotary printing press with a contact plate and front marks arranged in front of the pre-grippers.
  • the quality of the print on sheets is often unsatisfactory. The reason for this also lies in the sheet feeder device. If a sheet is not in the fully stretched state on the system, ie on the front marks, it is grasped by the pre-grippers on the gripper edge in the wavy state and fed to the first printing unit. The sheet is rolled out, stretched and possibly also compressed between the printing unit cylinders. This can lead to duplication. If, for example, one sheet lies flat on the sheet feeder and the next sheet lies curled, this inevitably leads to different sheet behavior in the individual printing units.
  • the object of the invention is to provide a sheet stretching device on the contact sheet of a sheet feeder device, which is structurally simple, and with which it is possible to smooth out ripples from the sheet leading edge, the so-called “gripper edge", before it is detected by the gripper, and with which it is also easier to separate the sheet to be fed into the machine or into the first printing unit from the sheet below it which is subsequently fed.
  • the sheet smoothing device can be used in conventional sheet feeders.
  • the drawings show a sheet 1 on which the sheets 2 to be fed to the printing press are fed.
  • a bar 3 which can be moved up and down is arranged transversely to the feed direction above the contact plate 1 or the sheet 2 fed thereon, with the aid of which the sheet smoothing is to be effected.
  • This bar preferably has 3 holes 4 for the frequently used photodiodes (not shown) for arc monitoring.
  • 3 recesses 5 and 6 are provided in the bar.
  • the beam 3 is fastened on at least one side with a lifting part 7 which can be moved up and down.
  • the lifting part 7 is urged by a compression spring 8, which is supported on one side of the support plate 9 which is connected to the machine side wall 10, in the direction of the contact plate 1 or in the direction of the sheet 2 located on the contact plate 1.
  • the lifter part 7 is raised by a curve and a control roller 11 against the pressure of the spring 9, i.e. moved up.
  • a so-called single-turn shaft 12, which is only indicated in FIG. 1, can be used for this control.
  • guide rollers 13, 14 are arranged on the lifter part 7, which in a corresponding groove (not shown) of a guide part 15, which is also on the side wall 10 is attached, run up and down.
  • the recesses 5, 6 in the bar 3 are each provided at the locations in which grippers, preferably pre-grippers 16 for taking over the sheet and introducing it into the first printing unit, and front marks 17 are positioned. This makes it possible to position the bar 3 as close as possible to the leading edge of the sheet above the contact plate 1, which improves its effectiveness.
  • the beam 3 is preferably provided with roundings 19, which favors the sheet entry.
  • waves are swept out of the gripper edge or the front area of the sheet 2, so that it lies flat on the contact sheet 2.
  • the grippers 16 can safely take them over in an extended state.
  • the bar 3 is lifted up by a corresponding control of the lifting part 7.
  • the front marks 7 were pivoted away in the usual way before the sheet 2 was pulled off.
  • the sheet to be removed is left with enough evasive means so that it can be easily separated from the sheet subsequently fed in a shingled manner. This also eliminates the risk of the subsequent sheet below being pulled upwards in part or over the entire width. This would adversely affect the flatness of the newly arriving sheet at its leading edge.
  • An advantage of the invention is that the degree of freedom in height is restricted for the entire width of the sheet. It is therefore not the case that the sheets are only partially pressed down, as is sometimes the case with the known devices, rather the sheet is pressed down uniformly over its entire width and rid of ripples. Furthermore, by means of the sheet smoothing device according to the invention, undesired lateral movement of the sheet can be avoided, which could impair or nullify the side contact (draw mark register).
  • the gripper edge can thus be kept flat before and after it is aligned, and an even sheet entry into the printing press is ensured. This helps to improve the quality of the print with regard to doubling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP86106491A 1985-06-15 1986-05-13 Dispositif d'aplanissement du bord avant d'une feuille dans le dispositif d'alimentation d'une rotative en feuilles Withdrawn EP0205880A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3521590 1985-06-15
DE3521590A DE3521590C1 (de) 1985-06-15 1985-06-15 Bogenglaetteinrichtung fuer die Greiferkante eines Bogens an der Bogenanlage einer Bogenrotationsdruckmaschine

Publications (2)

Publication Number Publication Date
EP0205880A2 true EP0205880A2 (fr) 1986-12-30
EP0205880A3 EP0205880A3 (fr) 1987-11-11

Family

ID=6273432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106491A Withdrawn EP0205880A3 (fr) 1985-06-15 1986-05-13 Dispositif d'aplanissement du bord avant d'une feuille dans le dispositif d'alimentation d'une rotative en feuilles

Country Status (4)

Country Link
US (1) US4802663A (fr)
EP (1) EP0205880A3 (fr)
JP (1) JPS628942A (fr)
DE (1) DE3521590C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716085A1 (de) * 1987-05-14 1988-12-01 Roland Man Druckmasch Bogenglaetteinrichtung fuer die seitenkante eines bogens
DE4302129C2 (de) * 1993-01-27 2003-03-06 Heidelberger Druckmasch Ag Vorrichtung zum Fördern von Bogen von einer Druckmaschine zu einem Stapel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757388C (de) * 1938-05-24 1952-09-29 Wilfred George Lawson Bogenglattstreichvorrichtung fuer Zylinderschnellpressen
GB715266A (en) * 1950-10-31 1954-09-08 Headley Townsend Backhouse Improvements in or relating to sheet feeding machines
GB2067526A (en) * 1979-12-20 1981-07-30 Komori Printing Mach Incorrectly fed sheet detectors for use in sheet-fed presses

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899202A (en) * 1959-08-11 Rttorneys
US1984588A (en) * 1932-04-19 1934-12-18 Liebusch Max Sheet feeding apparatus
US3884461A (en) * 1974-04-22 1975-05-20 Telautograph Corp Facsimile drum feed
DE2713994C2 (de) * 1977-03-30 1983-01-27 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Bogenhaltevorrichtung einer Bogen- Rotations-Druckmaschine, welche den Druckbogen geringfügig zu verformen vermag
US4645195A (en) * 1985-07-03 1987-02-24 Eastman Kodak Company Sheet-registration and feeding apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757388C (de) * 1938-05-24 1952-09-29 Wilfred George Lawson Bogenglattstreichvorrichtung fuer Zylinderschnellpressen
GB715266A (en) * 1950-10-31 1954-09-08 Headley Townsend Backhouse Improvements in or relating to sheet feeding machines
GB2067526A (en) * 1979-12-20 1981-07-30 Komori Printing Mach Incorrectly fed sheet detectors for use in sheet-fed presses

Also Published As

Publication number Publication date
JPS628942A (ja) 1987-01-16
EP0205880A3 (fr) 1987-11-11
US4802663A (en) 1989-02-07
DE3521590C1 (de) 1986-08-21

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Inventor name: FISCHER, HERMANN