EP0771749A1 - Device for controlling and adjusting ream pile heights in machines for selecting large loose reams - Google Patents

Device for controlling and adjusting ream pile heights in machines for selecting large loose reams Download PDF

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Publication number
EP0771749A1
EP0771749A1 EP96830539A EP96830539A EP0771749A1 EP 0771749 A1 EP0771749 A1 EP 0771749A1 EP 96830539 A EP96830539 A EP 96830539A EP 96830539 A EP96830539 A EP 96830539A EP 0771749 A1 EP0771749 A1 EP 0771749A1
Authority
EP
European Patent Office
Prior art keywords
blade
pack
height
control
ream
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Withdrawn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
EP96830539A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ivo Balestra
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.)
Wrapmatic SpA
Original Assignee
Wrapmatic SpA
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 Wrapmatic SpA filed Critical Wrapmatic SpA
Publication of EP0771749A1 publication Critical patent/EP0771749A1/en
Withdrawn legal-status Critical Current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
    • B65H3/00—Separating articles from piles
    • B65H3/32—Separating articles from piles by elements, e.g. fingers, plates, rollers, inserted or traversed between articles to be separated and remainder of the pile
    • B65H3/322—Separating articles from piles by elements, e.g. fingers, plates, rollers, inserted or traversed between articles to be separated and remainder of the pile for separating a part of the pile, i.e. several articles at once
    • B65H3/325—Separating articles from piles by elements, e.g. fingers, plates, rollers, inserted or traversed between articles to be separated and remainder of the pile for separating a part of the pile, i.e. several articles at once the pile being pre-marked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/422—Handling piles, sets or stacks of articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/15—Height, e.g. of stack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/20—Actuating means angular
    • B65H2555/24—Servomotors

Definitions

  • the present invention relates to a device for size control and adjustment in machines for selection of large loose reams.
  • the sheets to be fed to the packaging machines, coming from the shearing machine, are stacked on a pallet; then, this pallet is placed on an elevator, which automatically raises it toward a packs forming station.
  • the machine that prepares the sheet packs, from which the reams are formed counts the sheets and puts a sign between one sheet and the next one in order to define a ream in relation to the predetermined number of sheets; the sign is nothing but a small piece of paper or something like that, usually sparkling, that protrudes from the sheet pack.
  • the reams are selected by automatic machines, see e.g. US Patent No. 5.244.340 and Patent Application No. IT-B094A 000371, both of the same Applicant, that select the reams by a sensor unit which checks the flatness of the free surface of a sheet pack, and which moves vertically.
  • the unit supports and operates a blade that defines the ream thickness by its vertical adjustment with respect to the unit.
  • This blade can both move horizontally away from and toward the ream until it penetrates therein, and rotate so as to obtain a gap between the pre-selected ream and the pack sufficient to allow transfer means to penetrate the same ream.
  • These transfer means include a servomechanism equipped with a couple of horizontal blades, arranged parallel to each other and near the edge of the sheet pack.
  • These blades are supported by a carriage, sliding on a horizontal guide so that they can slide parallel to a longitudinal dimension of the sheet pack and penetrate therein.
  • the blades can be adjusted vertically.
  • the ream size is still to be changed manually by an operator, who must raise and lower the blade with respect to the sensor unit by releasing and then locking the blade to its support.
  • the distance between blade and head is adjusted at a constant value (for a unique size, obviously) and does not take into consideration other variable parameters, such as the ream thickness, that changes in relation to the different position of the sheets in the pack.
  • the thickness of a ream selected at the top of the pack is different from the height of a ream, having the same number of sheets, situated on the bottom of the pack. This is due to the fact that in the bottom ream less air is trapped between one sheet and another, because of the weight of the rest of the pack placed thereover.
  • the Applicant has designed and set up a device for controlling and adjusting the blade position during the size change over.
  • This device can be applied to the above mentioned machines for selection of large loose reams and allows a rapid, automatic and precise change of the blade vertical position in relation to the new size of reams to be selected, with or without references or signs.
  • the Applicant has also conceived and defined, through practical tests and experiments, an algorithm that take into consideration also variables connected with different vertical positions of the sheet ream in the pack, with a corresponding correction of the blade vertical position executed in real time.
  • the subject device allows to control and adjust ream size in machines for selection of large loose reams 1, formed from a pack 2 of stacked sheets.
  • This pack 2 rests on a table 3 which moves in two opposite directions along a vertical axis Z and is situated upstream of a station 4 for packaging reams separated from the pack 2.
  • the table 3 may include a driving system, equipped with a couple of close-loop chains 21 mounted on respective couples of sprockets 22a and 22b.
  • the working runs of the chains support, in a cantilevered fashion, the movable table 3, that carries a pallet B and the respective sheet pack 2.
  • Figure 2 shows means 5 for moving a ream 1 selected by selection means 6, toward the above mentioned packaging station 4.
  • the moving means 5 (represented only schematically and by a broken line, since they are of known type and do not strictly form part of the present invention) include plates 23 supported by a cross piece 24 that moves away from and toward the packaging station 4.
  • the selection means 6 include a unit 7 which goes in abutment onto the free surface of the pack 2 and supports a blade 8 for defining the height of the ream 1.
  • the blade 8 moves along with the unit 7 near an edge 2a of the pack 2 and also along a path parallel to the free surface of the sheet pack 2.
  • the vertical position of the blade 8 can be adjusted by the control unit 7 in two vertical directions to set a predetermined distance, indicated with Hc, which substantially defines the height Hr of the ream to be selected.
  • the blade 8 is adjusted by drive means 9 which are connected to the same blade and situated on the control unit 7.
  • the drive means 9 move the blade 8 in two opposite directions (see Arrow F of Fig. 2) so as to change the height of the blade with respect to the control unit 7.
  • the drive means 9 define the above mentioned, predetermined theoretical height Hc of the ream 1 to be selected.
  • These drive means 9 may include e.g. a motor 17, such as a step motor or another similar one, supported by a vertical rod schematically shown at 18 and connected with the control unit 7.
  • the motor 17 drives a threaded rod 19 set in screw engagement with a threaded bushing 20, with which the blade 8 is made integral.
  • the blade 8 can change its height in two opposite directions since this mechanism provides movement therefor.
  • the motor is fixed to the lower surface of the blade, in the region of the blade rear border, and the threaded rod extends upwards and pass through a threaded bushing made integral with the support unit 7.
  • the threaded rod turns and moves the blade, along with the motor, vertically due to its screw engagement with the bushing.
  • a handwheel is keyed to the upper end of the threaded rod so that the blade may also be moved manually during size change over.
  • Means 10 for detecting one or more values of the sheet pack 2 height act on the motor 17 and change the blade 8 position with respect to the control unit 7 in relation to the ream 1 real height Hr.
  • these detecting means 10 check, in real time, the change of the sheet pack 2 height, as this pack gets thinner and thinner due to separation of the reams brought to the packaging station 4.
  • the means 10 for detecting one or more values of the sheet pack 2 height are used.
  • These means 10 include a unit 11, for calculating and measuring the pack 2 height, constituted by e.g. an encoder connected for rotation to one of the above mentioned sprockets 22a or 22b.
  • Outlet of this encoder 11 is connected with a computer and processing unit 12, e.g. a PLC, which operates in real time to control the motor 17 so as to change the height of the blade 8 with respect to the control unit 7.
  • a computer and processing unit 12 e.g. a PLC, which operates in real time to control the motor 17 so as to change the height of the blade 8 with respect to the control unit 7.
  • the computer unit 12 is equipped with an algorithmic correction program AS, which can be linear, hyperbolic or other, depending on the type of the sheet pack selection and, consequently, on the correction to be made on the blade.
  • AS algorithmic correction program
  • this algorithmic system AS is linear and set up properly for this purpose in accordance with the type of conformation and structure of the sheets pack 2.
  • Fig. 5 shows the algorithm function plotted in a X-Y axes diagram, in which the pack 2 height is reported on the X-axis and the correction values ⁇ x result from the Y-axis.
  • the blade 8 is displaced to select a height resulting from either the sum Hr+ ⁇ x, when the blade enters upper part of the pack 2, or the subtraction Hr- ⁇ x, when the blade 8 enters the terminal part of the sheet pack 2.
  • H is the variable that is updated each time and sent to the computer unit 12 by the encoder 11 each time it is necessary to correct the blade 8 position.
  • the computer unit 12 If the computer unit 12 has this data in real time and constantly, it will makes the corrections as mentioned above and illustrated in Fig.5.
  • the PLC can calculate each time the value of the variable corresponding to the blade 8 movement constantly detected by the encoder 11, with respect to the previous position assumed with respect to the unit 7.
  • this value is set in relation with the value H in order to take into consideration the reduction of the pack 2 height.
  • the value Hr of the ream 1 to be selected is corrected, by introducing a correction value correlated with the change of the ream 1 thickness in relation to its vertical position in the pack 2.
  • the just explained solution may be used also for the selection, in which the sheets pack 2 is provided with a plurality of signs 13, regularly spaced apart and each inserted partly in the pack 2 and partly protruding from it.
  • control unit 7 is provided with a stationary vertical bar 14, which extends under the blade 8 and folds the sign 13 downward in direction of the edge 2a of the pack 2, as the same pack is raised by the movable table 3.
  • the detecting means 10 include a photocell 15, situated beside the blade 8 and coplanar therewith.
  • the photocell is connected directly with the motor 17, so as to perform possible changes of the blade 8 vertical position in relation to the position of the folded sign 13 front part, since also in this case the thickness of different reams 1 changes in relation to their position in the pack 2.
  • the detecting means 10 include only the said photocell 15, coplanar with the blade 8 and connected directly with the motor 17, so as to change the blade 8 vertical position in relation to the position of the print 16.
  • this device carries out control and adjustment operations in the following way, beginning from a situation, in which the movable table 3 is situated in the lowest point of the selection station, so as to make it possible for a pack 2 of sheets, without signs 13 or prints 16, to enter the same station.
  • the zero setting of the encoder 11 begins, due to the signal of a photocell 40 situated in the region of the raising table 3 in a wait position for the pack 2.
  • the photocell 25 is moved to the height D, just above the machine plane P, and the blade 8 is displaced to the theoretical height Hc of a ream 1, defined with respect to the control unit 7.
  • the table 3 is operated and raises the pack 2 (see arrow F1 of Fig. 1) until this latter is detected by the photocell 25, stopping the upward movement of the table 3.
  • the computer unit 12 calculates the actual size Hp of the pack, on the basis of the height H, that is known from the encoder 11.
  • the correction value for the blade 8 vertical position can be calculated by the computer unit 12, which has stored in its memory the other data (pallet height, machine plane distance, etc.).
  • the computer unit 12 activates the motor 17, which moves the blade 8 away from the unit 7 (see arrow F of Fig. 2). Afterwards, according to the procedure, the blade 8 begins to select the reams 1 moving horizontally into the sheets pack 2 (see arrow F2 of Figure 1 ) to penetrate therein.
  • the unit 12 corrects the blade 8 vertical position, so as to keep the selected reams 1 identical, until the pack 2 height is smaller or equal to the ream 1 height, i.e. Hp ⁇ Hr.
  • This situation is detected by the encoder 11 and provokes disablement of blade 8 operation meanwhile enabling downward movement for the raising table 3, so as to substitute the empty pallet B with a new pack 2 to be selected.
  • the blade 8 position is corrected directly by the photocell 15, which, reading the position of the signs 13 or of the prints 16, acts directly on the motor 17 to adjust the blade 8 position.
  • this device fully achieves the objects, by means of a simple and practical structure and a high level of selection reliability.
  • Small dimensions of the control elements unit permit to provide it with all the elements that allow to make selection with or without the signs, thus making the selection device adaptable to all necessities.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Packaging Of Special Articles (AREA)
EP96830539A 1995-10-31 1996-10-21 Device for controlling and adjusting ream pile heights in machines for selecting large loose reams Withdrawn EP0771749A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95BO000515A IT1280258B1 (it) 1995-10-31 1995-10-31 Dispositivo di controllo e regolazione di formati in apparecchiature di selezione di grandi risme sfuse.
ITBO950515 1995-10-31

Publications (1)

Publication Number Publication Date
EP0771749A1 true EP0771749A1 (en) 1997-05-07

Family

ID=11340884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96830539A Withdrawn EP0771749A1 (en) 1995-10-31 1996-10-21 Device for controlling and adjusting ream pile heights in machines for selecting large loose reams

Country Status (3)

Country Link
EP (1) EP0771749A1 (it)
JP (1) JPH09188427A (it)
IT (1) IT1280258B1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2786756A1 (fr) * 1998-12-03 2000-06-09 Canon Kk PROCEDE D'ETALONNAGE D'UN SYSTEME DE MESURE DE l'EPAISSEUR D'UNE FEUILLE OU PILE DE FEUILLES ET MACHINE DE TRAITEMENT DE FEUILLES METTANT EN OEUVRE LE PROCEDE
FR2786758A1 (fr) * 1998-12-03 2000-06-09 Canon Kk Procede de mesure de l'epaisseur d'une feuille ou pile de feuilles et machine de traitement de feuilles mettant en oeuvre ce procede
WO2001036310A1 (en) * 1999-11-16 2001-05-25 Fabio Perini S.P.A. A method for determining and verifying the number of sheets forming a ream of paper in a machine for selecting reams
WO2007051555A2 (de) * 2005-11-03 2007-05-10 Schneider Engineering Ag Steuerungsvorrichtung, vorrichtung zum fixieren eines stapels papierbogen und entstapelvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147319A2 (en) * 1983-12-21 1985-07-03 Kanzaki Paper Manufacturing Co., Ltd Method and apparatus for sequentially feeding sheet stacks
JPH05170354A (ja) * 1991-12-19 1993-07-09 Fuji Photo Film Co Ltd シート束検出方法
US5244340A (en) 1990-07-17 1993-09-14 Wrapmatic, S.P.A. Semiautomatic equipment for the separation of loose large size reams from a stack of single sheet
WO1995021785A1 (en) * 1994-02-10 1995-08-17 Alf Peter Nissen Method and device for dividing a stack of sheets into reams and feeding the reams into a wrapping machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147319A2 (en) * 1983-12-21 1985-07-03 Kanzaki Paper Manufacturing Co., Ltd Method and apparatus for sequentially feeding sheet stacks
US5244340A (en) 1990-07-17 1993-09-14 Wrapmatic, S.P.A. Semiautomatic equipment for the separation of loose large size reams from a stack of single sheet
JPH05170354A (ja) * 1991-12-19 1993-07-09 Fuji Photo Film Co Ltd シート束検出方法
WO1995021785A1 (en) * 1994-02-10 1995-08-17 Alf Peter Nissen Method and device for dividing a stack of sheets into reams and feeding the reams into a wrapping machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 580 (M - 1500) 21 October 1993 (1993-10-21) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2786756A1 (fr) * 1998-12-03 2000-06-09 Canon Kk PROCEDE D'ETALONNAGE D'UN SYSTEME DE MESURE DE l'EPAISSEUR D'UNE FEUILLE OU PILE DE FEUILLES ET MACHINE DE TRAITEMENT DE FEUILLES METTANT EN OEUVRE LE PROCEDE
FR2786758A1 (fr) * 1998-12-03 2000-06-09 Canon Kk Procede de mesure de l'epaisseur d'une feuille ou pile de feuilles et machine de traitement de feuilles mettant en oeuvre ce procede
WO2001036310A1 (en) * 1999-11-16 2001-05-25 Fabio Perini S.P.A. A method for determining and verifying the number of sheets forming a ream of paper in a machine for selecting reams
WO2007051555A2 (de) * 2005-11-03 2007-05-10 Schneider Engineering Ag Steuerungsvorrichtung, vorrichtung zum fixieren eines stapels papierbogen und entstapelvorrichtung
WO2007051555A3 (de) * 2005-11-03 2007-08-16 Schneider Eng Ag Steuerungsvorrichtung, vorrichtung zum fixieren eines stapels papierbogen und entstapelvorrichtung

Also Published As

Publication number Publication date
IT1280258B1 (it) 1998-01-05
ITBO950515A1 (it) 1997-05-01
ITBO950515A0 (it) 1995-10-31
JPH09188427A (ja) 1997-07-22

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