EP0534245B1 - Verfahren und Vorrichtung zum Vereinzeln von blattförmigen Aufzeichnungsträgern - Google Patents

Verfahren und Vorrichtung zum Vereinzeln von blattförmigen Aufzeichnungsträgern Download PDF

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Publication number
EP0534245B1
EP0534245B1 EP92115550A EP92115550A EP0534245B1 EP 0534245 B1 EP0534245 B1 EP 0534245B1 EP 92115550 A EP92115550 A EP 92115550A EP 92115550 A EP92115550 A EP 92115550A EP 0534245 B1 EP0534245 B1 EP 0534245B1
Authority
EP
European Patent Office
Prior art keywords
separating roller
pile
sheet
slope
recording media
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.)
Expired - Lifetime
Application number
EP92115550A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0534245A1 (de
Inventor
Friedhelm Steinhilber
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.)
BDT Buero und Datentechnik GmbH and Co KG
Original Assignee
BDT Buero und Datentechnik 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 BDT Buero und Datentechnik GmbH and Co KG filed Critical BDT Buero und Datentechnik GmbH and Co KG
Publication of EP0534245A1 publication Critical patent/EP0534245A1/de
Application granted granted Critical
Publication of EP0534245B1 publication Critical patent/EP0534245B1/de
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
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0669—Driving devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/113—Front, i.e. portion adjacent to the feeding / delivering side
    • B65H2405/1136—Front, i.e. portion adjacent to the feeding / delivering side inclined, i.e. forming an angle different from 90 with the bottom

Definitions

  • the invention relates to a method for separating sheet-shaped recording media from a stack according to the preamble of claim 1 and an apparatus therefor according to the preamble of claim 3.
  • sheet-shaped recording media are kept in a stack and are occasionally removed from the stack and fed to the office machine for transferring the recording.
  • corner separators are generally used which rest on the two front corners of the top sheet of the stack and hold them in place.
  • a separating roller frictionally engages the uppermost sheet of the stack and pushes it against the corner separators, so that the sheet bulges, detaches from the sheets of the stack underneath and snaps over the corner separators. This type of separation can only be used with record carriers of lower rigidity.
  • the support surface on which the stack rests has a slope in the area of the top sheets of the stack.
  • the stack is pressed against a separating roller by a spring-loaded pressure plate, the uppermost sheets of the stack coming into the area of this slope, at which their front edges are fanned out, so that the top sheet can be pushed over the edge of the slope.
  • This type of separation is only suitable for recording media of sufficiently high rigidity. Leaves with less stiffness cannot be fanned upright because they bend too much.
  • a device which combines corner separators with a bevel for separating paper sheets and rigid envelopes.
  • the device is structurally complex and an adjustment of the corner separators is necessary when changing the recording medium.
  • the invention has for its object to provide a method and an apparatus for separating sheet-shaped recording media from a stack, which enable reliable isolation of recording media of different stiffness with little design effort, without the need to adjust the device.
  • this object is achieved by a method having the features of claim 1 and by a Device with the features of claim 3.
  • the stack of sheet-shaped recording media lies with its leading edge on a slope.
  • a separating roller lies against the stack and frictionally engages the recording medium sheets in order to push them against the incline.
  • the leading edge of the sheet fed in each case runs up at the bevel and is thereby lifted off the stack.
  • this sheet In order for the leading edge of the respectively advanced sheet to be pushed up on the bevel and lifted off the stack, this sheet must be bent between the front edge abutting the bevel and the line in which the separating roller lies on the sheet. In order that such a bending of the sheet is possible, there must be a sufficient distance between the bevel and the separating roller.
  • the greater the stiffness of the record carrier i.e. the greater the distance, i.e. the greater the resistance that the sheet offers against bending.
  • this distance between the slope and the separating roller automatically adjusts to the optimum value corresponding to the respective stiffness of the recording medium.
  • the separating roller is mounted in such a way that it can move freely away from the slope on the stack of recording media.
  • the separating roller first acts directly adjacent to the slope on the top sheet of the stack.
  • the separating roller is driven to frictionally engage this sheet to push against the slope, the front edge of the sheet can only run up the slope and be isolated if the sheet has only a low rigidity.
  • the sheet of a stiffer record carrier offers greater resistance to the bending and thus the running up of the leading edge at the slope.
  • the sheet is grasped and drawn in by the office machine after being pulled off the stack, the sheet takes the singling roller resting on the sheet with it into the starting position on the bevel due to its freely movable bearing. The device is thus again in its starting position for the next separation process.
  • the separating roller thus automatically adjusts itself to the distance from the slope, which is necessary in accordance with the rigidity of the recording medium, so that it is lifted off the stack at the slope and can be isolated.
  • the device can therefore reliably separate recording media of different stiffness, for example paper sheets of different thickness, cards, envelopes, etc., without any changes.
  • bevel should be understood to mean any inclined surface against which the uppermost sheet abuts at an acute angle, so that on the one hand a deflecting force component acts on the front edge of the sheet as it is pushed against this surface and on the other hand the friction of the front edge on this surface of the Counteracts distraction.
  • the slope can thus be an inclined flat surface, a curved surface or the partial lateral surface of a cylindrical roller, etc.
  • the freely movable mounting of the separating roller on the stack necessary for the separation according to the invention can be implemented in different ways.
  • the separating roller can be mounted in rocker arms so that it can move on the stack by pivoting these rocker arms. So that the separating roller can run on the flat stack, the pivoting movement of the separating roller must be sufficiently parallel to the stack surface, i.e. the rocker arms must be arranged as perpendicular as possible to the surface of the stack and the swing radius of the separating roller must be sufficiently large compared to its path of movement on the stack.
  • This version is therefore particularly suitable for those cases in which recording media are separated with not too great differences in stiffness, e.g. Sheets of paper of different thickness.
  • the separating roller is preferably guided in slide tracks that run parallel to the stacking surface. As a result, a sufficiently large movement distance of the singling roller parallel to the stack surface is possible for all stiffnesses of the recording media.
  • the separating roller is expediently guided in a position parallel to the inclined surface.
  • Such a forcibly parallel guidance can be achieved in the storage of the separating roller in rocker arms in that the rocker arms supporting the two ends of the separating roller are torsionally rigid, e.g. are connected to each other by a transverse axis.
  • the compulsory parallel guidance can be achieved in that the separating roller is rotatably seated on a continuous axis, on the two ends of which sprockets are rotatably attached, each of which engages in a toothing of the slide track.
  • the separation roller In order to facilitate the separation on the slope, it is advantageous if the separation roller always acts on the stack with the same contact pressure regardless of the height of the stack of recording media. This is only possible to a limited extent with a contact pressure by spring force, since the spring force changes with the deflection of the spring and thus the stack height. If the separating roller engages the stack of recording media from above, it is therefore preferred to allow the separating roller to engage the stack under its own weight, which does not change.
  • the separating roller is essentially in one vertically movable storage unit mounted so that it can freely follow the decreasing stack height and always only rests on the stack under its own weight and the weight of this storage unit. The weight of the separating roller and the bearing unit can be kept very small. This has a favorable effect on the separation, since a low weight means a low contact pressure of the separation roller, which in turn keeps the friction between the first and the second sheet of the stack opposing the separation low.
  • the separating roller engages the stack of recording media from below, the first lowermost sheet of the stack to which the separating roller engages always assumes the same position, so that the separating roller does not have to follow the stack height.
  • the pressure force of the separating roller against the stack can thus be set precisely regardless of the stack height. In this case, however, it is expedient to place a pressure plate on the stack which, even with the last sheets of the stack, still ensures the required minimum weight as a counter bearing for the separating roller.
  • the vertical movement of the bearing unit can also compensate for the arcuate curvature of the path of movement of the separating roller with respect to the plane of the stack, so that the separating roller is also exactly parallel to the plane of the stack in this case can move on this.
  • the device can also separate stacks that contain sheets of different stiffness, for example alternating sheets of paper or cards and envelopes. Since the separating roller returns to its initial position on the slope after each separating operation, it adjusts itself to the appropriate distance for each sheet in the stack. The return of the separating roller to the starting position can be supported by a return spring. If the stack in the device is in a position inclined to the horizontal, so that the movement path of the separating roller is also inclined, the return to the starting position can also be carried out by the weight of the separating roller. In these cases, a freewheel is preferably provided in the drive of the separating roller, which enables the separating roller to return freely on the stack independently of the drive connection under the effect of the restoring force.
  • the separating roller is preferably driven via a gearwheel gear which engages in a gearwheel seated on the separating roller. So that a reliable tooth engagement is ensured despite the movement of the separating roller, the last gear of the gear transmission, which meshes with the gear of the separating roller, is expediently mounted on a pivotable bearing lever which rotatably receives the axis of the separating roller. If the separating roller is mounted in rocker arms, this bearing lever can be one of these rocker arms.
  • the device for feeding recording media to a printer can be attached to or integrated into the printer, the stationary drive shaft preferably being in drive connection with the printer's platen roller, so that the drive and the control of the separation by the Platen control of the printer can be effected.
  • the device has a box-shaped housing in the form of an open plastic trough, on the essentially horizontal bottom 12 of which the stack of recording media 14 is received lying flat.
  • a slope 18 is inserted transversely into the housing and rises away from the base 12 and from the stack of the recording media 14 against the transverse wall of the housing.
  • the height of the bevel 18 is at least somewhat larger than the maximum intended height of the stack of the recording media 14.
  • a separating roller 20 lies on the stack and extends across the recording medium 14 parallel to the plane of the stack and parallel to the bevel 18.
  • the separating roller 20 consists of a tube 22, which is rotatably mounted on a continuous axis 26 and carries on its outer circumference friction rollers 24, which come into positive engagement with the recording media 14.
  • the two ends of the axis 26 of the separating roller 20 protruding from the tube 22 are each guided in a slide track 50 of a bearing unit 52, which has the shape of a vertical plate abutting the side wall 30 of the housing.
  • the guide tracks 50 run horizontally and thus parallel to the plane of the stack of recording media 14.
  • the separating roller 20 is guided via its axis 26 in the link tracks 50 in a horizontal plane parallel to the plane of the stack of the recording media 14, the engagement of the pinion 28 in the serrations 54 causes a positive guide, which ensures that the separating roller 20 at this movement always maintains a position parallel to the slope 18.
  • the bearing unit 52 has a continuous transverse axis 56 which is freely rotatably mounted in the plates abutting the side walls 30, the ends of which engage in link tracks 58 which are formed in the side walls 30.
  • the link tracks 58 run in the side walls 30 parallel to the inclination of the incline 18.
  • the bearing unit 52 with the separating roller 20 can be moved up and down vertically in the link tracks 58, the toothed pinions 60 meshing with the teeth 62 effecting a positive guidance which ensures that the separating roller 20 always maintains a position parallel to the surface of the stack of recording media 14.
  • a return spring 64 is fixed at one end to the axis 26 of the separating roller 20 and at the other end to a pin fixed to the housing and pulls the separating roller 20 against the end of the sliding track 50 closest to the bevel 18.
  • the singling roller 20 In the starting position shown in Figure 1, the singling roller 20 is below its own weight and Dead weight of the storage unit 52 on top of the stack of recording media 14, since the storage unit 52 is freely movable in the slide path 58.
  • the return spring 64 holds the separating roller 20 in the position closest to the bevel 18, in which the separating roller 20 engages the uppermost sheet of the stack directly at its front edge, with which this sheet lies against the bevel 18.
  • the separating roller 20 is now rotated counterclockwise (in the illustration in FIG. 1) by means of a drive (not shown).
  • the separating roller 20 If the record carriers 14 have a greater rigidity, the leading edge of the top sheet of the stack cannot be bent at the bevel 18 and the separating roller 20 is therefore unable to advance the top sheet from the stack. Due to the rotation of the separating roller 20 in the counterclockwise direction, the separating roller 20 with its friction rollers 24 thus rolls to the left on the uppermost sheet of the stack held by the bevel 18. This increases the distance of the separating roller 20 from the slope 18 and thus the free length of the top sheet between the bevel 18 and the line of contact of the separating roller 20, in which the sheet can bend. Depending on the stiffness of the recording medium 14, the singling roller 20 sooner or later reaches a distance from the bevel 18 during this movement to the left (in FIG.
  • the separating roller 20 with the bearing unit 52 moves downward in the guide tracks 58 due to its own weight, the separating roller 20 always with the same pressure determined by its own weight rests on the stack of recording media 14. Since the slide tracks 58 run parallel to the bevel 18, the spacing ratios of the separating roller 20 from the bevel 18 are also independent and constant from the height of the stack of the recording media 14. All sheets of the entire stack from the first to the last sheet are thus separated under exactly the same conditions.
  • the storage unit 52 is raised with the separating roller 20 so that the stack can be inserted and pushed against the bevel 18.
  • the separating roller 20 is pulled back by the return spring 64 into the end position facing the bevel 18 in the slide path 58, so that the starting position of FIG. 1 is taken up again when the separating roller 20 is placed on the newly inserted stack of recording media 14.
  • the device is driven by a gear transmission.
  • a first gearwheel with an axis fixed to the housing is preferably driven by the office machine, to which the recording media are fed.
  • this first gearwheel can engage a gearwheel seated on the axis of the platen roller of a printer, so that the device is driven via the platen roller control of the printer.
  • a first lever is pivotally mounted about the axis of the first gear. At the free end of the first lever, a bearing lever is articulated, the other end of which rotatably receives the axis of the separating roller 20.
  • the first gear meshes with an intermediate gear, which is in the pivot point of the both levers is mounted.
  • This intermediate gear drives a gear 48 via gears mounted on the bearing lever, which gear sits on the separating roller 20.
  • the gear mechanism can follow the movement of the separating roller 20 due to the arrangement of the gear mechanism on the levers which are connected to one another in an articulated manner.
  • the first lever is arranged essentially vertically, while the bearing lever runs essentially horizontally.
  • this allows a large range of motion for the separating roller 20 and, on the other hand, in particular the last gear of the gear mechanism engages the gear 48 of the separating roller 20 in a horizontal plane, so that the engagement pressure of this last gear does not affect the contact pressure of the separating roller 20 determined by its own weight increasingly weakens.
  • FIG. 1 Another embodiment of the invention is shown in FIG. 1
  • the stack of recording media 14 rests on a floor 12 which is fixed to the housing and which is inclined at an angle of approximately 45 ° to the horizontal.
  • the bevel 18 is arranged in front of the lower front edge of the base 12 at a distance so that an engagement gap 66 remains open between the front edge of the base 12 and the lower edge of the bevel 18.
  • the bevel 18 is inclined downward, pointing away from the perpendicular to the floor 12.
  • the separating roller 20 is arranged in the engagement gap 66 and bears against the first lowermost sheet of the stack of the recording media 14 from below.
  • the separating roller 20 is rotatable with its axis 26 in the free ends of bearing levers 68 arranged on both sides stored.
  • the bearing levers 68 are pivotally mounted about a drive shaft 70 fixed to the housing, a transverse axis connecting the two bearing levers 68 in a torsionally rigid manner, so that the bearing levers 68 can only be pivoted exactly parallel to one another.
  • the bearing levers 68 are arranged substantially perpendicular to the base 12 and thus to the stack of the recording media 14, the length of the bearing levers 68 and thus the radius of the pivoting movement of the singling roller 20 being large in relation to the pivoting path of the singling roller 20 in the engagement gap 66.
  • the path of movement of the separating roller 20 is thereby almost flat and parallel to the stack.
  • the remaining slight circular arc-shaped curvature of the movement path of the separating roller 20 is of no importance, since the stack of recording media 14 is not supported by the floor 12 in the area of the engagement gap 66 and therefore rests on the separating roller 20 and thereby compensates for the slight deviations from a flat movement path.
  • a pressure plate 72 lies on the stack of recording media 14, which is either placed freely or is pivotally mounted in the rear area in the side walls 30 of the housing .
  • the pressure plate 72 essentially determines the contact pressure of the stack against the separating roller 20, so that this contact pressure is largely independent of the stack height and is also maintained up to the last sheet of the stack.
  • the separating roller 20 is driven by a gear 74 which is mounted coaxially to the drive shaft 70 and engages in the gear 48 seated on the separating roller 20.
  • the gear 74 is driven by the office machine, not shown, to which the record carriers 14 are fed.
  • the singling roller 20 bears against the bevel 18, so that it comes into contact with the first lowermost sheet of the stack of the recording media 14 directly at its front edge which bears against the bevel 18. If the separating roller 20 is driven (counterclockwise in FIG. 4), it pushes the bottom sheet of the stack against the bevel 18. If the recording media have only a slight rigidity, the leading edge of the bottom sheet can move under the feed force of the separating roller 20 turn on the slope 18 so that it is lifted off the stack and is pushed down on the slope 18. The sheet can thus be removed from the stack and fed to the office machine.
  • the separating roller 20 rolls away from the bevel 18 on the bottom sheet. This increases the distance of the separating roller from the bevel 18 until the free length of the sheet between the bevel 18 and the separating roller 20 is sufficient for the sheet to adhere to the bevel 18 despite its rigidity turn and can be separated in the manner described above.
  • the separating roller 20 falls back into the starting position shown in FIG. 4, in which it lies against the bevel 18, due to its own weight. A freewheeling of the separating roller 20 decouples the drive. As soon as the separating roller 20 is now driven again, it automatically runs again into the position corresponding to the respective stiffness of the recording medium 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP92115550A 1991-09-24 1992-09-11 Verfahren und Vorrichtung zum Vereinzeln von blattförmigen Aufzeichnungsträgern Expired - Lifetime EP0534245B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4131726 1991-09-24
DE4131726A DE4131726A1 (de) 1991-09-24 1991-09-24 Verfahren und vorrichtung zum vereinzeln von blattfoermigen aufzeichnungstraegern

Publications (2)

Publication Number Publication Date
EP0534245A1 EP0534245A1 (de) 1993-03-31
EP0534245B1 true EP0534245B1 (de) 1994-12-14

Family

ID=6441339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115550A Expired - Lifetime EP0534245B1 (de) 1991-09-24 1992-09-11 Verfahren und Vorrichtung zum Vereinzeln von blattförmigen Aufzeichnungsträgern

Country Status (4)

Country Link
US (1) US5377969A (enrdf_load_stackoverflow)
EP (1) EP0534245B1 (enrdf_load_stackoverflow)
JP (1) JP2770208B2 (enrdf_load_stackoverflow)
DE (2) DE4131726A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7404553B2 (en) 2003-08-21 2008-07-29 Helmut Steinhilber Procedure and device for separation of sheets of a medium

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EP0775078B1 (en) * 1995-05-23 1999-09-22 Koninklijke Philips Electronics N.V. Apparatus for consecutively processing sheet-like record carriers
US5709381A (en) * 1996-11-22 1998-01-20 Hewlett-Packard Company Printer media tray with automatic skewing of stack of media
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US6454476B1 (en) 1999-04-14 2002-09-24 Hewlett-Packard Company Apparatus and method for picking and feeding print media sheets
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DE19950307C1 (de) * 1999-10-19 2001-02-01 Bdt Buero Datentech Gmbh Vorrichtung zum Vereinzeln von Blättern eines Aufzeichnungsträgers
US6371478B1 (en) 2000-04-18 2002-04-16 Hewlett-Packard Company Adaptive apparatus for improving media separation
US6463255B1 (en) * 2000-11-28 2002-10-08 Aetas Technology, Incorporated Sheet feeder, imaging system and method
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US20040046309A1 (en) * 2002-08-31 2004-03-11 Samsung Electronics Co., Ltd. Paper pick-up device of image forming apparatus
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US7152859B2 (en) * 2004-06-15 2006-12-26 Xerox Corporation Sheet separator
JP2006273474A (ja) * 2005-03-28 2006-10-12 Fuji Photo Film Co Ltd 平版印刷版の供給装置
DE102005056634B4 (de) * 2005-11-25 2010-07-22 Bdt Ag Blattvereinzelungssystem, Verfahren zum reibschlüssigen Separieren und Fördern von Blättern
DE102007018398A1 (de) 2007-04-17 2008-10-23 Bdt Ag Blattvereinzelungssystem, Blatthandhabungssystem und Verfahren zum reibschlüssigen Reparieren und Fördern von Blättern
JP4506996B2 (ja) * 2007-06-29 2010-07-21 ブラザー工業株式会社 給紙装置
JP4506997B2 (ja) * 2007-06-29 2010-07-21 ブラザー工業株式会社 給紙装置
JP5935990B2 (ja) * 2012-04-27 2016-06-15 セイコーエプソン株式会社 被記録媒体給送装置及び記録装置

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Publication number Priority date Publication date Assignee Title
US7404553B2 (en) 2003-08-21 2008-07-29 Helmut Steinhilber Procedure and device for separation of sheets of a medium

Also Published As

Publication number Publication date
US5377969A (en) 1995-01-03
JP2770208B2 (ja) 1998-06-25
EP0534245A1 (de) 1993-03-31
DE4131726A1 (de) 1993-03-25
DE59200972D1 (de) 1995-01-26
DE4131726C2 (enrdf_load_stackoverflow) 1993-08-26
JPH05213462A (ja) 1993-08-24

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