EP0755887A2 - Procédé et dispositif pour freiner pneumatiquement des feuilles dans le dispositif de décharge d'une machine rotative d'impression de feuilles - Google Patents

Procédé et dispositif pour freiner pneumatiquement des feuilles dans le dispositif de décharge d'une machine rotative d'impression de feuilles Download PDF

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Publication number
EP0755887A2
EP0755887A2 EP96110376A EP96110376A EP0755887A2 EP 0755887 A2 EP0755887 A2 EP 0755887A2 EP 96110376 A EP96110376 A EP 96110376A EP 96110376 A EP96110376 A EP 96110376A EP 0755887 A2 EP0755887 A2 EP 0755887A2
Authority
EP
European Patent Office
Prior art keywords
sheet
braking
blowing
air
air flow
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
EP96110376A
Other languages
German (de)
English (en)
Other versions
EP0755887B1 (fr
EP0755887A3 (fr
Inventor
Günter Stephan
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
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0755887A2 publication Critical patent/EP0755887A2/fr
Publication of EP0755887A3 publication Critical patent/EP0755887A3/fr
Application granted granted Critical
Publication of EP0755887B1 publication Critical patent/EP0755887B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68—Reducing the speed of articles as they advance
    • B65H29/686—Pneumatic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a method and to a device for pneumatic sheet braking in the delivery of a sheet-fed rotary printing machine by means of blown air, which is opposite to the sheet transport direction.
  • This air flow which opposes the arc movement, creates a negative pressure on the rear edge of the blow bar in the direction of the sheet travel, through which the sheet is sucked in and thereby braked due to the resulting frictional forces.
  • the entire width of the sheet comes into contact with the blow bar, or in individual zones, so that there are slight signs of smearing, especially in the perfecting.
  • a guide plate bent downward in the shape of a horn with cut-out tongues adjoins the blow bar in the opposite direction to the sheet running. The blowing air directed from the blow nozzles of the blow bar under the bend flows over the curved surface and hugs the bend by negative pressure on the guide tongues.
  • the invention has for its object to provide a solution for a non-contact braking of a sheet carried on the braking path by an air stream in the delivery of a sheet-fed rotary printing press for high-quality printed products, in order to avoid smearing, especially in perfecting, when braking the sheet.
  • the effect of the method according to the invention is not based on friction of the sheet to be braked, but on shear stresses in the air flow carrying the sheet without contact.
  • the braking force results from the product of the shear stress resulting at the interface in the air flow and the area acted upon by this air flow.
  • the air flow is formed between a baffle and the bend. The pre-pressure of the air flow is converted into kinetic energy and the air flow spreads evenly to form a full-surface film flow under the arch.
  • the method according to the invention can be used in a particular manner in the case of an essentially contact-free sheet transport of the sheet in the delivery on an air flow carrying the sheet, this air flow being directed in the transport direction of the sheet.
  • both the air flow carrying the sheet and directed in the transport direction of the sheet and the air flow opposite to the sheet transport direction become for braking the sheet in front of the actual braking track for the sheet in a controlled downward direction.
  • the downward-derived air flow can optionally be returned to the blowing nozzles of one or the other air flow via control devices.
  • a device in which a blowing nozzle strip directed against the sheet transport direction has a rounded cross-sectional profile at least on its rear edge and blowing nozzles still in the region of these roundings.
  • a channel is arranged for discharging the air flows directed against one another.
  • the air volume and the air pressure can be adjustable to regulate the air flow for braking the sheet. Further control options are provided by adjustable blow nozzles with an adjustable throttle point and nozzle openings that are adjustable in the direction.
  • the drawing shows schematic representations for explaining the method according to the invention and for designing a device for carrying out such a method.
  • FIG. 1 shows a sheet delivery, in which sheet grippers 1 of a gripper system 3 arranged on revolving conveyor chains 2 grasp the sheet 4 at its front edge in the transport direction and lead from the last printing unit of a sheet-fed rotary printing press to delivery stack 5. Immediately before the delivery stack 5, the braking of the sheet arriving at high speed 4 begins. Blowing air directed against the transport direction of the sheet 4 is blown under the blow gripper by means of a blowing nozzle strip 6 which extends over the sheet width and has a rounded cross section and on its upper side 1 of the gripper systems 3 blown sheet blown.
  • a blowing nozzle strip 6 which extends over the sheet width and has a rounded cross section and on its upper side 1 of the gripper systems 3 blown sheet blown.
  • FIG. 2 shows a diagram of the formation of the speed distribution in the sheet transport direction that causes the shear stresses opposing air flow, the sheet is carried contact-free on a transport level with a distance above the guide level determined by mechanical installations.
  • the shear stresses developing in the air flow counteract the kinetic energy of the bow, so that the bow is braked continuously. It is advisable not to slow the sheet down to a standstill, but only to a residual speed that still allows good sheet placement on the delivery stack.
  • FIG. 3 shows that the braking air blown under the arch for the purpose of braking the arch 4 is diverted downward at the beginning of the braking section and can be blown again as braking air under the arch via a control element 7.
  • FIGS. 3 and 4 show the formation of a braking section for the sheet following a contact-free sheet guide through blown air which is blown under the sheet 4 in the direction of sheet transport.
  • the two encountered air streams one of which is directed towards the sheet in the transport direction of the sheet and one is directed against the sheet conveying direction for braking the sheet, are derived downward via a channel 8 and, if necessary, again via the control element 7 as brake air among the Blown sheet 4.
  • the outflow direction of the blow nozzles in the blow bar 6 is shown schematically in FIG. 4 in two alternative embodiments.
  • FIG. 5 An embodiment of the structural design of the blow nozzle bar 6 is shown in Figures 5 and 6.
  • the cross section in FIG. 5 shows a blower nozzle strip 6 formed from sheet metal with a connecting piece 10 for the Blowing air.
  • both the front edge and the rear edge of the blow nozzle bar 6 are rounded.
  • the blowing air exits against the conveying direction of the sheet 4 through blowing nozzles 9, which are formed by tongue-shaped incisions 11 on the top of the blowing nozzle strip 6.
  • Such incisions 11 are also located in the area of the rounding of the blow nozzle strip 6, in order in this way to avoid the formation of a vacuum under the arch 4.
  • the rear edge of the sheet 4 lowers onto the main stack 5 in the delivery.
  • FIG. 7 Blowing air is blown from the blowing nozzles 9 of the blowing nozzle strip 6 in the area of the braking section against the transport direction of the sheet, under the sheet 4 initially held by the gripper system 3 on its front edge, as a result of which the sheet 4 is tightened and stretched. Shear stresses form under the arch 4, as shown in FIG. 2, by means of which the arch 4 is braked after its release by the gripper system.
  • the sheet 4 is transported in a contact-free manner on the air flow for braking the sheet 4.
  • the sheet transport takes place before the braking section on an air flow which is directed in the conveying direction of the sheet.
  • This air flow carrying the sheet 4 and the air flow directed against it for pneumatic sheet braking are derived downward immediately before the braking section for the sheet 4.
  • the possible return of the derived air flow was explained in relation to FIG. 3.
  • FIG. 8 illustrates the shingled sheet transport to the delivery stack 5. While the rear end of a sheet 4 already released by the gripper system 3 shows the shear stresses caused by surface friction Brake air is exposed, a subsequent sheet 4 is still held by the gripper system 3 and carried by the air flow directed in the conveying direction. Only when the rear end of the former sheet 4 has cleared the channel 8 for discharging the air for sheet conveying and the brake air for braking the sheet, do shear stresses also form under the second sheet for braking the sheet. In this way, a completely non-contacting shingling takes place with the aid of the levitation guide upstream of the braking section, which also saves time for braking the arch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Discharge By Other Means (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP96110376A 1995-07-27 1996-06-27 Procédé et dispositif pour freiner pneumatiquement des feuilles dans le dispositif de décharge d'une machine rotative d'impression de feuilles Expired - Lifetime EP0755887B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19527441 1995-07-27
DE19527441A DE19527441C2 (de) 1995-07-27 1995-07-27 Verfahren und Vorrichtung zum pneumatischen Bogenabbremsen im Ausleger einer Bogenrotationsdruckmaschine

Publications (3)

Publication Number Publication Date
EP0755887A2 true EP0755887A2 (fr) 1997-01-29
EP0755887A3 EP0755887A3 (fr) 1997-10-15
EP0755887B1 EP0755887B1 (fr) 2002-01-30

Family

ID=7767923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110376A Expired - Lifetime EP0755887B1 (fr) 1995-07-27 1996-06-27 Procédé et dispositif pour freiner pneumatiquement des feuilles dans le dispositif de décharge d'une machine rotative d'impression de feuilles

Country Status (7)

Country Link
US (1) US5718176A (fr)
EP (1) EP0755887B1 (fr)
JP (1) JP3676503B2 (fr)
CN (1) CN1144187A (fr)
AT (1) ATE212601T1 (fr)
CA (1) CA2180061A1 (fr)
DE (2) DE19527441C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3533738A3 (fr) * 2018-02-28 2019-09-11 Müller Martini Holding AG Frein à feuille d'impression

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10129886A (ja) * 1996-10-15 1998-05-19 Heidelberger Druckmas Ag 枚葉紙処理機械の自動給紙機における枚葉紙用紙差し板
DE19914177A1 (de) * 1999-03-29 2000-10-05 Heidelberger Druckmasch Ag Ausleger einer Bogen verarbeitenden Druckmaschine
DE10049809B4 (de) * 1999-10-28 2014-02-13 Heidelberger Druckmaschinen Ag Leitvorrichtung für einen flächenhaften Bedruckstoff
DE10043807B4 (de) * 1999-12-17 2009-05-07 Heidelberger Druckmaschinen Ag Ausleger einer flächige Bedruckstoffe verarbeitenden Maschine
DE10133633A1 (de) * 2000-08-31 2002-03-14 Heidelberger Druckmasch Ag Leit-und Tragelemente mit gedrosselter Blasluft
US7513499B2 (en) 2004-05-04 2009-04-07 Heidelberger Druckmaschinen Ag Sheet brake using a partitioned blower nozzle array
US8454665B2 (en) * 2005-09-16 2013-06-04 Christopher G. Sidebotham Multi-purpose bone plate system
DE102008010985A1 (de) * 2008-02-25 2009-08-27 Heidelberger Druckmaschinen Ag Bogenbremseinrichtung
US7913999B2 (en) * 2008-06-12 2011-03-29 Xerox Corporation Resilient belt sheet compiler with mixed sheet length mode
BR102015024454A2 (pt) 2014-10-01 2016-05-24 Mueller Martini Holding Ag freio extrator transversal para folha de impressão
JP6694255B2 (ja) * 2014-10-01 2020-05-13 ミュラー・マルティニ・ホルディング・アクチエンゲゼルシヤフト 印刷用紙ブレーキ
US11214453B2 (en) * 2018-07-23 2022-01-04 Hewlett-Packard Development Company, L.P. Media transfer
CN111605764B (zh) * 2020-06-04 2021-10-29 青岛欣欣向荣智能设备有限公司 气流穿带打包机及其打包方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081082A (en) * 1958-12-15 1963-03-12 Linotype Machinery Ltd Sheet control for printing machines
US3437335A (en) * 1967-06-16 1969-04-08 Sperry Rand Corp Fluid document transporter
US3503607A (en) * 1967-12-27 1970-03-31 Sperry Rand Corp Pneumatic document stacking device
DE2135105B1 (de) * 1971-07-14 1972-11-09 Roland Offsetmaschf Bogenauslegevorrichtung an Rotationsdruckmaschinen
DE2358206C3 (de) * 1973-11-22 1979-10-04 Roland Offsetmaschinenfabrik Faber & Schleicher Ag, 6050 Offenbach Vorrichtung an Druckmaschinen zum Transport von Bogen
JPS5269186A (en) * 1975-12-08 1977-06-08 Hitachi Ltd Air conveyor
DE2720674A1 (de) * 1977-05-07 1978-11-09 Maschf Augsburg Nuernberg Ag Bogenauslegevorrichtung fuer eine rotations-druckmaschine
DE3113750A1 (de) * 1981-04-04 1982-10-14 Heidelberger Druckmaschinen Ag, 6900 Heidelberg "bogenausleger fuer rotationsdruckmaschinen mit an endlosen ketten umlaufenden greiferbruecken"
DD251964A1 (de) * 1986-08-04 1987-12-02 Polygraph Leipzig Bogenleiteinrichtung in auslegern von druckmaschinen
US4993882A (en) * 1986-12-22 1991-02-19 Shimizu Construction Co., Ltd. Waste collection method
DE3841909A1 (de) * 1988-04-02 1989-10-19 Hilmar Vits Verfahren und vorrichtung zum schwebenden fuehren von bogen- oder bahnfoermigem material ueber eine foerderstrecke, insbesondere eine gekruemmte foerderstrecke

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3533738A3 (fr) * 2018-02-28 2019-09-11 Müller Martini Holding AG Frein à feuille d'impression
US10934119B2 (en) 2018-02-28 2021-03-02 Mueller Martini Holding Ag Printing sheet brake

Also Published As

Publication number Publication date
US5718176A (en) 1998-02-17
ATE212601T1 (de) 2002-02-15
JP3676503B2 (ja) 2005-07-27
JPH0940260A (ja) 1997-02-10
DE19527441A1 (de) 1997-02-06
DE19527441C2 (de) 1998-01-29
DE59608664D1 (de) 2002-03-14
EP0755887B1 (fr) 2002-01-30
CN1144187A (zh) 1997-03-05
CA2180061A1 (fr) 1997-01-28
EP0755887A3 (fr) 1997-10-15

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