EP1560773A2 - Dispositif d'alimentation feuille par feuille pour imprimante - Google Patents

Dispositif d'alimentation feuille par feuille pour imprimante

Info

Publication number
EP1560773A2
EP1560773A2 EP03809334A EP03809334A EP1560773A2 EP 1560773 A2 EP1560773 A2 EP 1560773A2 EP 03809334 A EP03809334 A EP 03809334A EP 03809334 A EP03809334 A EP 03809334A EP 1560773 A2 EP1560773 A2 EP 1560773A2
Authority
EP
European Patent Office
Prior art keywords
sheet
single sheet
separating
stack
printer
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Withdrawn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
EP03809334A
Other languages
German (de)
English (en)
Inventor
Matthias Becke
Christian Fenner
Robert Heimbach
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
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 Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP1560773A2 publication Critical patent/EP1560773A2/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/48—Air blast acting on edges of, or under, 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing

Definitions

  • the invention relates to a single sheet feeder for a printer.
  • EP 1 090 859 A1 describes a single sheet feed device for a printer in which a sheet stack consisting of single sheets is received in a carrier and the single sheets are successively transported from a conveyor belt into the printer.
  • the feed device comprises a front nozzle which directs an air flow against the transport direction onto the sheet stack, a side nozzle which directs an air flow transversely to the transport direction onto the sheet stack, and a suction device which directs the uppermost single sheet separated by the air flows from the sheet stack towards the conveyor belt sucks. These air flows are timed to each other so that the top single sheet is separated as reliably as possible from the single sheets below and the latter are pressed onto the sheet stack.
  • a corresponding single sheet feeder is also known from EP 0 801 016 AI.
  • the operating times in which the front nozzle, the side nozzle and the suction device for separating the uppermost single sheet from the underlying single sheets work are set so that the time available for separating is used as completely as possible for the smallest single sheet format processed in the feeding device becomes.
  • the time in which at least one of the abovementioned components intended for separating the uppermost single sheet is in operation is essentially equal to the time available for separating the uppermost single sheet.
  • the smallest processed single sheet format designed timing of the front nozzle, the side nozzle and the suction device is also applied to single sheets with a larger format.
  • the timing is designed for the smallest single sheet format, a reliable separation of the top single sheet is not always guaranteed for larger formats, which leads to errors in the. Cut sheet feeder can come that. affect printing.
  • the object of the invention is to provide a single sheet feed device for a printer, which enables the most reliable separation of the uppermost single sheet from the individual sheets below for different single sheet formats.
  • a single sheet feed device for a printer comprising a carrier for receiving a sheet stack consisting of single sheets, a separating device for separating the uppermost single sheet from the sheet stack, a transport device for transporting the single sheet separated from the sheet stack into the printer and a controller for setting the operating time of the separating device, during which the separating device for separating the single sheet from the sheet stack is in operation, as a function of the single sheet dimension in the transport direction.
  • the single sheet size determined by the single sheet format in the transport direction it is possible to achieve a particularly effective separation of the uppermost single sheet from the single sheets below it for each single sheet format.
  • the time available for this separation which depends on the cut sheet dimension in the transport direction, can be fully used for each cut sheet format. This is especially the case with large single sheet formats an advantage, since experience has shown that separating them from the stack of sheets underneath is more difficult than is the case with smaller formats.
  • a method for controlling a single sheet feed device is provided.
  • FIG. 1 shows a side view of a single sheet feed device according to the invention
  • FIG. 2 is a top view of the single sheet
  • FIG. 3 shows a longitudinal section of part of the feed device shown in FIGS. 1 and 2,
  • FIG. 4 shows a perspective view of the part of the feed device shown in FIG. 3
  • FIGS. 5a and 5b are perspective views of a side nozzle
  • FIG. 6 time diagrams for the time control of the feed device
  • Figure 7 is a diagram showing the relationship
  • FIG. 1 and 2 show a single sheet feed device 10 for a printer, not shown.
  • the feed device 10 serves to pull the single sheets one after the other from a sheet stack 12 consisting of single sheets, which is arranged in a carrier 14 designed as a drawer, and to feed them to the printer.
  • the feed device comprises the carrier 14 and a suction belt conveyor 16 which is arranged above the carrier 1 and thus above the single sheet stack 12 accommodated in the carrier 1.
  • the suction belt conveyor 16 comprises a suction box 18 and an endless conveyor belt 20 surrounding it.
  • the bottom of the suction box 18 and the conveyor belt 20 are each provided with holes, not shown, which are arranged in a regular pattern. At the points where the holes of the suction box 18 and those of the conveyor belt 20 overlap, air passages are formed through which an upward air flow can be generated, as indicated in FIG. 1 by the arrows between the suction belt conveyor 16 and the carrier 14 is.
  • This air flow is generated by a first blower 22, the inlet side of which via an intake line 24
  • Suction box 18 is connected.
  • the single sheet sucked by the sheet stack 12 is then passed through the conveyor belt 20 is pulled from the sheet stack 12.
  • the entry of the peeled single sheet into a transpnrtspa.lt, not shown, arranged in the output path is detected by a light barrier, not shown, on which the conveyor belt 20 is stopped.
  • the single sheet, which at this point is already at least partially in the printer, is then transported further in this by a transport device, not shown, and printed by a printing unit.
  • the feed device 10 further comprises a second fan 28 which is connected to an outlet line 30, the outlet opening of which is laterally, i.e. transversely to the transport direction of the single sheets, is directed onto the sheet stack 12 received in the carrier 14.
  • the orientation of the air flow generated by the second fan 28 is determined by a side nozzle 32 arranged at the outlet end of the outlet line 30, which is shown in more detail in FIGS. 5a and 5b.
  • the second fan 28 serves to blow air through the outlet line 30 onto the sheet stack 12.
  • the air flow generated by the second fan 28 fans out the upper single sheets somewhat and presses the uppermost single sheet upward towards the suction belt conveyor 16. The air flow thus forms a flow nucleus for blowing air between the single sheets 12 in order to separate them.
  • the feed device 10 further comprises a third fan 33 which is connected to an outlet line 34. At this outlet end there is a front nozzle 36 shown in FIG. 4, which directs an air flow from the front, ie against the transport direction, onto the upper single sheets. tet.
  • This air flow supports the detachment of the uppermost single sheet from the sheet stack 12 by creating an overpressure between the uppermost single sheet and the rest of the sheet stack 12. This overpressure presses those single sheets, which are located below the uppermost single sheet, firmly onto the sheet stack 12. This can prevent these single sheets from detaching from the sheet stack 12.
  • the side nozzle 32 is shown in perspective in FIGS. 5a and 5b.
  • the side nozzle 32 has the function of dividing the air flow hitting the sheet stack 12 laterally into a plurality of air flows which have different flow characteristics. In their interaction, these air streams with their own flow characteristics ensure that the uppermost single sheet is reliably detached from the sheet stack 12.
  • the side nozzle 32 is designed as an insert which is inserted into the outlet opening of the outlet line 30.
  • the side nozzle 32 comprises a plurality of nozzle parts 38 to 48, the function of which is described in detail in EP 1 090 859 A1 on page 2, line 26 to page 3, line 4.
  • Figure 3 shows part of the feed device 10 in a section along the transport direction.
  • Figure 4 shows this part in a perspective view.
  • the front nozzle 36 blows a stream of air 50 from the front onto the cut sheets 12 to bring air between the cut sheet sucked against the conveyor belt 20 and the cut sheet below it, thereby pressing the cut sheet stack 12.
  • the front nozzle 36 has a slot-shaped opening 37, the central part 37 'of which is wider than parts 37''lying on both sides of this part 37', as shown in FIG.
  • the air flow 50 is thus larger in the middle than on its sides, as a result of which a suitable pressure is built up below the uppermost single sheet.
  • two pivotable light barrier levers 52 are provided which rest on the upper surface of the uppermost single sheet.
  • One of the light barrier levers 52 cooperates with a light barrier, not shown, in order to detect a drop in the sensing level of the individual sheets 12 in the carrier 14 below a predetermined sensing level value, which is determined, for example, by a predetermined number of single sheets.
  • the other light barrier lever 52 interacts with a further light barrier, not shown, in order to detect an end of operation in which there is no longer a single sheet in the carrier 14.
  • a recess is formed in a support surface (not shown) of the carrier 14, into which this light barrier lever 52 falls, as it were, when the last single sheet has been removed from the carrier 14.
  • the timing of the feed device 10 is described below with reference to FIGS. 6 and 7 in order to separate the uppermost single sheet from the sheet stack 12 arranged in the carrier 14 and to convey it into the printer.
  • the following components of the feed device 10 are responsible for separating the uppermost single sheet: the first blower 22, which in combination with the solenoid valve 26 sucks the uppermost single sheet via the suction line 24 to the suction belt conveyor 16, the second blower 28, which via the The outlet line 30 and the side nozzle 32 direct an air flow transversely to the transport direction onto the sheet stack 12, and the third blower 33, which directs an air flow against the transport direction onto the sheet stack 12 via the outlet line 34 and the front nozzle 36.
  • the components mentioned form a separating device, the operating time during which the separating device for separating the uppermost single sheet from the stack is in operation by a separating control (not shown) depending on the individual sheet dimension is set in the transport direction.
  • the operating time of the separation device is determined by the operating times of its components mentioned above.
  • the cut sheet dimension in the transport direction which is taken into account in the time control, and which is determined by the cut sheet format, is made available to the separation control in the present exemplary embodiment by means of a corresponding user input.
  • This input takes place, for example, via a control panel provided on the printer or the feed device 10.
  • the dimensional information is then fed to the separation controller, which may be located in the feeder 10 itself or in the printer.
  • the single sheet dimension can also be provided in the feed device 10 itself, that is to say without corresponding user input. In this case, appropriate sensors are to be provided in the feed device, which automatically detect the single sheet dimension.
  • FIG. 6 shows two time diagrams which are intended to illustrate the timing of the feed device 10 according to the invention.
  • the single sheets have a dimension in the transport direction, i.e. a sheet length that corresponds to a long format.
  • the upper time diagram shows the time control as it was previously, i. H. without taking into account the sheet size in the direction of transport.
  • the timing is the same as that used for single sheets with short format.
  • the lower time diagram shows the time control of the feed device 10 taking into account the individual sheet dimension.
  • the time diagrams shown in FIG. 6 each show the time-dependent operating states of the side nozzle 32 (line A), the front nozzle 36 (line B), the suction box 18 (line C) and the conveyor belt 20 from bottom to top (Line D).
  • the top line E. indicates the state in which the top single sheet is in the carrier 14.
  • the high level of the time course indicates a state in which the top single sheet is still at least partially in the carrier 14, but is already in a translational movement leading into the printer.
  • the low level of this time course indicates that there is currently no single sheet in the carrier 14 in the above-mentioned translation movement.
  • a process cycle of the feed device 10 is limited by the two times TZA and TZE defined by the vertical lines.
  • TZA specifies a point in time at which the separation control receives a cycle start signal from a main control, not shown, provided in the printer.
  • TZE indicates a point in time at which the disconnection control receives an end of cycle signal from the main control.
  • the side nozzle 32 begins to direct an air flow onto the sheet stack 12 transversely to the transport direction.
  • the front nozzle 36 begins to direct an air flow against the transport direction onto the sheet stack 12.
  • the second blower 22 and the suction box 18 begin to suck the top single sheet toward the conveyor belt 20.
  • the air flow from the side nozzle 32 ends at the time T4. The same applies to the air flow coming from the front nozzle 36 at a later time T5.
  • the conveyor belt 20 begins to rotate, as a result of which the uppermost single sheet in the carrier 14, which has already been partially sucked towards the conveyor belt 20, begins its translational movement leading into the printer, as can be seen from the uppermost time profile E of the time diagram.
  • the suction of the uppermost single sheet directed onto the conveyor belt 20 is ended.
  • the conveyor belt 20 is stopped at a time TLS.
  • the single sheet separated from the sheet stack 12 and partially transported from the carrier 14 reaches a light barrier, not shown, which is arranged near a pair of transport rollers arranged in the printer.
  • This pair of transport rollers forms the input part of a feed device provided in the printer, which ensures the transport of the single sheet in the printer.
  • the transport device provided in the printer takes over the transport of the single sheet, so that the conveyor belt 20 can be switched off.
  • the part of the single sheet still present in the carrier 14 at the time TLS is then conveyed into the printer by the above-mentioned transport device.
  • the lower time diagram according to FIG. 6 shows the time control of the feed device 10 taking into account the individual sheet dimension.
  • an additional time interval .DELTA.T (x) is defined by which the operating times of the side nozzle 32, the front nozzle 36 and the suction box 18 are extended.
  • this additional time interval ⁇ T (x) is dimensioned such that the operating time of the side nozzle 32 begins at the time T ZA . This means that under the given conditions stands for the side nozzle 32 available operating time is fully utilized. Comparing the upper time diagram in FIG.
  • the operating times of the side nozzle 32, the front nozzle 36 and the suction box 18 each consist of a base time interval which is independent of the cut sheet size and an additional time interval which is dependent on the cut sheet size.
  • the base time interval corresponds to the time interval between the times T4 and Tl, T5 and T2 or T7 and T3.
  • the additional time interval is given by ⁇ T (x).
  • the time intervals dependent on the single sheet dimension are obtained, which are given by the time intervals of the times T4 and T1 ⁇ , T5 and T2 ⁇ or T7 and T3 ⁇ .
  • the printer can be operated in two operating modes.
  • a first operating mode hereinafter referred to as simplex operating mode
  • the single sheets fed to the printer are printed on one side.
  • a second operating mode hereinafter referred to as duplex mode
  • the printer prints the single sheets fed to it by the feed device 10 on both sides.
  • the processing speed at which the single sheets are printed in the printer is 158 single sheets per minute in the simplex mode and 79 single sheets per minute in the duplex mode.
  • the control of the The side nozzle 32, the front nozzle 36 and the suction chamber 18 separating device depends on the operating mode in which the printer is currently operated.
  • the base time intervals of the side nozzle 32, the front nozzle 36 and the suction chamber 18 and the additional time interval ⁇ T (x) are set individually for each of the two operating modes.
  • Table 1 shows the base time intervals for the simplex mode and Table 2 for the duplex mode specified.
  • intervals which are the same for the additional time intervals of the side nozzle 32, the front nozzle 36 and the suction box 18 in the present exemplary embodiment, are calculated for the two operating modes according to the following formulas
  • X denotes the single sheet dimension in the transport direction, i.e. the sheet length.
  • the constants cl and c2 are set to 1 in the present exemplary embodiment.
  • FIG. 7 shows a diagram which shows the relationship between the size of the single sheet and a size referred to below as the separation time, which is derived from the time ZE- ZA required for a process cycle and is reduced by the time required for the transport of the single sheet.
  • the lower characteristic labeled I indicates the separation time for the simplex mode and the upper characteristic labeled II the separation time for the duplex mode.
  • the diagram according to FIG. 6 shows the additional time intervals ⁇ T (x) for the two operating modes with a single sheet dimension x of 310 mm. With the single sheet dimensions of 226 mm, the two characteristic curves I and II change suddenly.
  • 36 have the base ⁇ time intervals .DELTA.T (x) of the side nozzle 32, the front nozzle and the suction box 18 equal interval length.
  • This has the advantage of a particularly simple timing of the separating device formed by the components mentioned.
  • it is also possible to individually set the interval length for the individual components.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

La présente invention concerne un dispositif d'alimentation feuille par feuille (10) destiné à une imprimante, comprenant un support (14) qui sert à prendre en charge une pile de feuilles (12) composée de feuilles individuelles, un dispositif de séparation (22 à 36) qui sert à séparer la feuille du dessus de la pile de feuilles (12), un dispositif de transport (20) qui sert à acheminer la feuille séparée de la pile de feuilles (12) vers l'intérieur de l'imprimante et une commande de séparation qui sert à régler le temps de fonctionnement du dispositif de séparation (22 à 36), au cours du fonctionnement du dispositif de séparation (22 à 36) qui sert à séparer la feuille de la pile de feuilles (12), en fonction de la dimension des feuilles dans la direction de transport.
EP03809334A 2002-10-28 2003-10-27 Dispositif d'alimentation feuille par feuille pour imprimante Withdrawn EP1560773A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2002150146 DE10250146A1 (de) 2002-10-28 2002-10-28 Einzelblatt-Zuführvorrichtung für einen Drucker
DE10250146 2002-10-28
PCT/EP2003/011908 WO2004037693A2 (fr) 2002-10-28 2003-10-27 Dispositif d'alimentation feuille par feuille pour imprimante

Publications (1)

Publication Number Publication Date
EP1560773A2 true EP1560773A2 (fr) 2005-08-10

Family

ID=32103103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03809334A Withdrawn EP1560773A2 (fr) 2002-10-28 2003-10-27 Dispositif d'alimentation feuille par feuille pour imprimante

Country Status (3)

Country Link
EP (1) EP1560773A2 (fr)
DE (1) DE10250146A1 (fr)
WO (1) WO2004037693A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10315648A1 (de) * 2003-04-04 2004-10-14 Heidelberger Druckmaschinen Ag Vorrichtung zum blattweisen Zuführen von blattförmigen Bedruckstoffen von einem Stapel zu einem Transportpfadeingang

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761077A (en) * 1971-09-23 1973-09-25 Polygraph Leipzig Blast air control device
EP0470951A1 (fr) * 1989-03-17 1992-02-19 Guy Martin Dispositif de prise de feuilles planes avec deramage a flux d'air turbulent
JP2533957B2 (ja) * 1990-03-20 1996-09-11 シャープ株式会社 重送防止機能付きシ―ト給送装置
US5344133A (en) * 1993-02-25 1994-09-06 Eastman Kodak Company Vacuum belt feeder having a positive air pressure separator and method of using a vacuum belt feeder
JP3080828B2 (ja) * 1994-01-14 2000-08-28 京セラミタ株式会社 用紙送り装置
DE19514746C2 (de) * 1995-04-21 2000-11-02 Roland Man Druckmasch Einrichtung zum Regeln des Blasluftbedarfs von Blasluftverbrauchern
US5707056A (en) * 1995-09-28 1998-01-13 Xerox Corporation Variable ratio feedhead plenum
NL1002819C2 (nl) * 1996-04-09 1997-10-14 Oce Tech Bv Inrichting voor het losmaken en afvoeren van het bovenste vel van een stapel.
DE19714204C2 (de) * 1997-04-07 2000-08-31 Roland Man Druckmasch Vorrichtung zur Regelung der Blasluft an einem Bogenanleger
NL1013218C2 (nl) * 1999-10-05 2001-04-06 Ocu Technologies B V Inrichting voor het ÚÚn voor ÚÚn afvoeren van vellen vanaf de bovenkant van een stapel vellen.
US6554269B1 (en) * 2000-10-14 2003-04-29 Heidelberger Druckmashinen Ag Airknife and vacuum control changes to improve sheet acquisition for a vacuum corrugated feed supply

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004037693A3 *

Also Published As

Publication number Publication date
DE10250146A1 (de) 2004-05-13
WO2004037693A2 (fr) 2004-05-06
WO2004037693A3 (fr) 2004-06-24

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