EP0475535A1 - Device for transporting paper, such as in the shape of sheets, in printing presses, bookbinding machines and such like - Google Patents

Device for transporting paper, such as in the shape of sheets, in printing presses, bookbinding machines and such like Download PDF

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Publication number
EP0475535A1
EP0475535A1 EP91202352A EP91202352A EP0475535A1 EP 0475535 A1 EP0475535 A1 EP 0475535A1 EP 91202352 A EP91202352 A EP 91202352A EP 91202352 A EP91202352 A EP 91202352A EP 0475535 A1 EP0475535 A1 EP 0475535A1
Authority
EP
European Patent Office
Prior art keywords
shape
air
sheets
roots
blower
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
EP91202352A
Other languages
German (de)
French (fr)
Other versions
EP0475535B1 (en
Inventor
Bernard Westera
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.)
WESTERA BEHEER BV
Original Assignee
WESTERA BEHEER 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
Family has litigation
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Application filed by WESTERA BEHEER BV filed Critical WESTERA BEHEER BV
Publication of EP0475535A1 publication Critical patent/EP0475535A1/en
Application granted granted Critical
Publication of EP0475535B1 publication Critical patent/EP0475535B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0891—Generating or controlling the depression
    • 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
    • B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device

Definitions

  • the invention relates to a device for transporting paper, such as for example in the shape of sheets, in printing presses, bookbinding machines and such like, which device comprises members provided with openings through which air can be sucked in or blown out, which openings can be connected to means for bringing the air under underpressure and overpressure respectively.
  • members are employed for example for blowing the sheets from each other or taking them up with vacuum suction members or with similar members.
  • the known means for generating underpressure and overpressure are represented by steel-lamellae pumps, with which on one hand air is sucked, so underpressure is generated, and which on the other hand bring the sucked air under overpressure, so that this air can be supplied to blow-out openings.
  • the pumps generate heat, which is to be removed and by which the moved air is heated, so that in many cases it is necessary to bring the air back to the correct relative degree of humidity again by means of steam humidifiers.
  • the invention seeks to remove these difficulties and to that end provides for, that the means for bringing the air under underpressure and overpressure is in the shape of a Roots-blower, which is driven with an adjustable speed, dependent on its charge.
  • Roots-blower is directly driven by an electric motor, in which the speed of the electric motor can be adjusted between 750 and 3000 rev./min.
  • each machine will preferably be provided with a lamellae pump of its own for preventing installation of many pipelines
  • it can be provided for that several machines are connected to one single Roots-blower through a pipe system and that a remote controlled cut off valve has been mounted in each branch of the pipe system to a machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

Device for transporting paper, such as in the shape of sheets, in printing presses, bookbinding machines and such like, which device comprises members provided with openings through which air can be connected to means for bringing the air under underpressure and overpressure respectively, in which the means for bringing air under underpressure and overpressure is in the shape of a Roots-blower, which is driven with an adjustable speed, dependent on its charge.

Description

  • The invention relates to a device for transporting paper, such as for example in the shape of sheets, in printing presses, bookbinding machines and such like, which device comprises members provided with openings through which air can be sucked in or blown out, which openings can be connected to means for bringing the air under underpressure and overpressure respectively.
  • In processing sheets of paper and cartonboard such as for example in printing presses, folding, cutting, wire-stitching machines and gang punches, members are employed for example for blowing the sheets from each other or taking them up with vacuum suction members or with similar members.
  • The known means for generating underpressure and overpressure are represented by steel-lamellae pumps, with which on one hand air is sucked, so underpressure is generated, and which on the other hand bring the sucked air under overpressure, so that this air can be supplied to blow-out openings.
  • With this known use of lamellae pumps the difficulty arises, that when at a certain moment a large number of suction openings have to become operative, a considerable fluctuation in the generated underpressure will occur, while the same will be the case in the generated overpressure, so that suddenly more air than perhaps desired will flow out of the blow-out openings possibly in use.
  • Further, the pumps generate heat, which is to be removed and by which the moved air is heated, so that in many cases it is necessary to bring the air back to the correct relative degree of humidity again by means of steam humidifiers.
  • Finally, the known pumps produce much noise and traces of oil could end up in the removed air which is supplied to the blowing openings, and they could cause problems.
  • Neither can the afore-mentioned difficulties be removed by replacing the lamellae pumps with compressors.
  • The invention seeks to remove these difficulties and to that end provides for, that the means for bringing the air under underpressure and overpressure is in the shape of a Roots-blower, which is driven with an adjustable speed, dependent on its charge.
  • It has been found that in this way the underpressure generated at the openings can substantially kept constant, while this is also the case for the overpressure.
  • According to a further development of the invention it is provided for, that the Roots-blower is directly driven by an electric motor, in which the speed of the electric motor can be adjusted between 750 and 3000 rev./min.
  • At the minimum speed the removed amount of air will in most cases meet the requirements. However, since a further reduction of speed can not be attained economically, means can be present for blowing off the air modulatingly or for supplying this when the capacity required by the device is below that which is produced at the lowest speed of the electric motor.
  • Whereas with known devices each machine will preferably be provided with a lamellae pump of its own for preventing installation of many pipelines, according to the invention it can be provided for, that several machines are connected to one single Roots-blower through a pipe system and that a remote controlled cut off valve has been mounted in each branch of the pipe system to a machine.
  • It has been found that in this way the number of necessary Roots-blowers can be reduced without the operation of the device being influenced adversely.

Claims (4)

  1. Device for transporting paper, such as in the shape of sheets, in printing presses, bookbinding machines and such like, which device comprises members which are provided with openings through which air can be sucked in or blown out, which openings can be connected to means for bringing the air under underpressure and overpressure respectively, characterized in that the means for bringing the air under underpressure and overpressure is in the shape of a Roots-blower, which is driven with an adjustable speed, dependent on its charge.
  2. Device according to claim 1, characterized in that the Roots-blower is directly driven by an electric motor, at which the speed of the electric motor can be adjusted between 750 and 3000 rev./min.
  3. Device according to claim 1 or 2, characterized in that means are present for blowing off air modulatingly or for supplying this when the capacity required by the device is below that which is produced at the lowest speed of the electric motor.
  4. Device according to one of the preceding claims, characterized in that several machines are connected to one single Roots-blower through a pipe system and that a remote controlled cut off valve is mounted in each branch of the pipe system to a machine.
EP91202352A 1990-09-14 1991-09-16 Device for transporting paper, such as in the shape of sheets, in printing presses, bookbinding machines and such like Revoked EP0475535B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9002027 1990-09-14
NL9002027A NL9002027A (en) 1990-09-14 1990-09-14 Apparatus for the transport of paper, such as in the form of sheets, in presses, bookbinding machines and the like.

Publications (2)

Publication Number Publication Date
EP0475535A1 true EP0475535A1 (en) 1992-03-18
EP0475535B1 EP0475535B1 (en) 1995-02-15

Family

ID=19857681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91202352A Revoked EP0475535B1 (en) 1990-09-14 1991-09-16 Device for transporting paper, such as in the shape of sheets, in printing presses, bookbinding machines and such like

Country Status (5)

Country Link
EP (1) EP0475535B1 (en)
AT (1) ATE118453T1 (en)
DE (1) DE69107379T2 (en)
DK (1) DK0475535T3 (en)
NL (1) NL9002027A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6439865B1 (en) 1998-04-30 2002-08-27 Werner Rietschle Gmbh & Co. Kg Vacuum pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764407A (en) * 1951-10-03 1956-09-25 Roland Offsetmaschf Device for controlling the air in machines working with suction
US2967054A (en) * 1958-05-22 1961-01-03 Mergenthaler Linotype Gmbh Vacuum and pressure control valve for printing presses
DE1239326B (en) * 1965-06-18 1967-04-27 Mabeg Maschb G M B H System for generating blown and suction air on sheet processing machines
GB1135747A (en) * 1967-02-08 1968-12-04 Mabeg Maschinenbau Gmbh Nachf A device for controlling the suction air supply and the pressure air supply for a sheet processing machine
DE1761488A1 (en) * 1968-05-25 1971-07-01 Polygraph Leipzig Sheet separating and separating device
DE2637073A1 (en) * 1976-08-18 1978-02-23 Oppenweiler Binder & Co Maschb Sheet positioner for folding machines - has suction equipment for sheets connected to injector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764407A (en) * 1951-10-03 1956-09-25 Roland Offsetmaschf Device for controlling the air in machines working with suction
US2967054A (en) * 1958-05-22 1961-01-03 Mergenthaler Linotype Gmbh Vacuum and pressure control valve for printing presses
DE1239326B (en) * 1965-06-18 1967-04-27 Mabeg Maschb G M B H System for generating blown and suction air on sheet processing machines
GB1135747A (en) * 1967-02-08 1968-12-04 Mabeg Maschinenbau Gmbh Nachf A device for controlling the suction air supply and the pressure air supply for a sheet processing machine
DE1761488A1 (en) * 1968-05-25 1971-07-01 Polygraph Leipzig Sheet separating and separating device
DE2637073A1 (en) * 1976-08-18 1978-02-23 Oppenweiler Binder & Co Maschb Sheet positioner for folding machines - has suction equipment for sheets connected to injector

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN. vol. 29, no. 8, January 1987, NEW YORK US pages 3599 - 3600; 'document feeder air system' *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 238 (M-508)(2294) 16 August 1986 & JP-A-61 069 657 ( KONISHIROK PHOTO IND CO LTD ) 10 April 1986 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6439865B1 (en) 1998-04-30 2002-08-27 Werner Rietschle Gmbh & Co. Kg Vacuum pump

Also Published As

Publication number Publication date
EP0475535B1 (en) 1995-02-15
ATE118453T1 (en) 1995-03-15
NL9002027A (en) 1992-04-01
DE69107379D1 (en) 1995-03-23
DK0475535T3 (en) 1995-02-15
DE69107379T2 (en) 1996-09-05

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