EP0295170B1 - Vorrichtung zum Entstapeln von verhältnismässig flachen Gegenständen, wie Briefen oder Postumschlägen - Google Patents

Vorrichtung zum Entstapeln von verhältnismässig flachen Gegenständen, wie Briefen oder Postumschlägen Download PDF

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Publication number
EP0295170B1
EP0295170B1 EP88401308A EP88401308A EP0295170B1 EP 0295170 B1 EP0295170 B1 EP 0295170B1 EP 88401308 A EP88401308 A EP 88401308A EP 88401308 A EP88401308 A EP 88401308A EP 0295170 B1 EP0295170 B1 EP 0295170B1
Authority
EP
European Patent Office
Prior art keywords
conveyor
objects
grasping means
stack
grasping
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
EP88401308A
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English (en)
French (fr)
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EP0295170A1 (de
Inventor
Jean-Pierre Volat
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.)
Bertin Technologies SAS
Original Assignee
Bertin et Cie SA
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 Bertin et Cie SA filed Critical Bertin et Cie SA
Priority to AT88401308T priority Critical patent/ATE70249T1/de
Publication of EP0295170A1 publication Critical patent/EP0295170A1/de
Application granted granted Critical
Publication of EP0295170B1 publication Critical patent/EP0295170B1/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
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C1/00—Measures preceding sorting according to destination
    • B07C1/02—Forming articles into a stream; Arranging articles in a stream, e.g. spacing, orientating
    • B07C1/025—Devices for the temporary stacking of objects provided with a stacking and destacking device (interstack device)
    • 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

Definitions

  • the invention relates to a device for unstacking relatively flat objects, such as letters or postal envelopes having variable lengths, widths and thicknesses.
  • the invention is applicable in particular in the field of mechanized or automated postal sorting.
  • Ordinary letters or postal envelopes can be processed by installations operating at a very high rate, in which stacks or rows of letters are brought to devices which extract the letters forming a pile one by one.
  • these known installations generally function correctly only if the letters or postal envelopes satisfy certain conditions of dimension and, in particular, of thickness.
  • Document US-A-4346876 discloses a device for unstacking flat objects which are taken one by one on a first conveyor and moved towards a second conveyor by means of suction cups carried by a movable table guided on along a crescent trajectory in the plane of the first conveyor, the suction cups being pivotally mounted around a transverse axis on this table in order to be able to correctly grasp objects tilted back on the first conveyor.
  • the subject of the invention is a device allowing the automatic unstacking of objects capable of having unusual dimensions and / or shapes.
  • the invention also relates to a device of this type, which can operate with relatively flat objects, such as letters or postal envelopes, which have dimensions and in particular very variable thicknesses within a determined range. .
  • the invention provides a device for unstacking flat objects, such as letters or postal envelopes having variable lengths, widths and thicknesses, comprising a first stack supply conveyor for said objects which are guided along a retaining wall against which they are applied by one of their edges, means for separating and picking up objects one by one at one end of the first conveyor to feed a second conveyor for transporting the objects one after the other the other in a direction perpendicular to that of the first conveyor, these means comprising on the one hand gripping means coming to be applied on the first object of the stack and on the other hand means for moving the gripping means relative to the first conveyor, characterized in that the object pickup means are carried by a carriage movable in a plane perpendicular to the direction of the first conveyor and are guided in displacement in this plane in a first direction perpendicular to those of the two aforementioned conveyors, to bring the object above the retaining wall and then in a second direction parallel to that of the second conveyor, to bring the object to the second conveyor.
  • the device comprises means for accelerating the displacement of the means for picking up objects in the aforementioned first direction which is preferably substantially vertical.
  • the acceleration is advantageously applied in the plane of the flat object, which thus withstands stress well without risk of deterioration.
  • This displacement which makes it possible to bring the object above the retaining and guiding wall of the stack, does not cause the following objects to be driven in the stack because it is carried out very quickly. Then, the movement of the object in the second direction can be done at normal speed, because any movement in this second direction of the objects in the stack is prevented by the retaining and guide wall.
  • the gripping means are connected to the aforementioned carriage by two parallel articulated arms, one of which carries a roller guided in a curved raceway.
  • this raceway which will determine the path of movement of the gripping means, as well as the speed of movement on this path.
  • the gripping means preferably comprise at least one suction cup mounted at the end of a tube guided in translation in a support and associated with a return spring urging it constantly towards the stack of objects.
  • the device preferably comprises two aforementioned suction cups, supplied by independent vacuum sources.
  • a device according to the invention having the aforementioned characteristics, is for example capable of removing objects one by one from a stack. dishes whose length varies from 140 to 350 mm, the height from 90 to 250 mm, the thickness from 0.6 to 20 mm, and the weight from 20 to 1000 g, at a rate that can vary between 4,000 and 10,000 objects per hour.
  • FIGS. 1 and 2 show the general arrangement of a device for unstacking relatively flat objects according to the invention.
  • This device first comprises a conveyor 10 for example of the type with toothed belts on which stacks or rows of relatively flat objects 12, such as letters or postal envelopes whose dimensions are outside current standards.
  • the stacks of objects are deposited on the conveyor 10, which is substantially horizontal, so that the objects 12 are placed on edge and lie in vertical planes substantially perpendicular to the direction of advance of the conveyor 10, designated by the arrow 14.
  • a toothed belt or belt forming part of the movement surface of the conveyor 10 comprises parallel separation plates 16, which are perpendicular to the direction 14 of movement of the conveyor.
  • Means for guiding and retaining the stacks of objects 12 placed on the conveyor 10 are provided along one side of this conveyor and consist for example of a substantially vertical wall 18 against which the stacks of objects 12 will be pushed when they are placed on the conveyor. At its front end 18 a, this side wall has a lower height, for example of the order of 30 mm. From this front end 18 a of the side wall leaves a second conveyor 20, intended to transfer each object 12 one by one in a direction 22 substantially horizontal perpendicular to the direction 14.
  • This conveyor 20 comprises a surface 24 for supporting the objects 12, which is at the level of the upper edge of the front end 18 a of the side wall 18, and means for moving the objects 12, comprising for example two parallel strips 26 and 28 whose drive rollers extend perpendicular to the surface 24.
  • each object 12 is thus clamped between the strands opposite the strips 26 and 28 and is moved in the direction of arrow 22.
  • the strip 28 facing the strip 26 passes for example on a roller biased by a spring, which allows it to move away from the strip 26 when an object passes 12 thicker.
  • the means for unstacking or picking up objects 12 one by one are generally designated by the reference 30 and are located at the front end of the conveyor 10, substantially at the start of the second conveyor 20.
  • These means 30, shown in more detail in FIG. 3, comprise a set of two suction cups 32 mounted in a support 34 connected by two articulated parallel arms 36 to a carriage 38 movable in reciprocating rectilinear movement parallel to the direction of movement of the second conveyor 20
  • the carriage 38 is guided in rectilinear movement by conventional means not shown and is connected for example by a connecting rod to a crankshaft.
  • One of the articulated arms 36 is equipped with a roller or roller 40 guided in a raceway 42 comprising a first part 42 a oblique making a small angle with a direction perpendicular to the directions 14 and 22 above, and a second part 42b parallel to the direction 22 of movement of the second conveyor 20.
  • the suction cups 32 are connected, under the control of a solenoid valve, to two sources of vacuum which are independent of each other.
  • an object 12 is brought by the first conveyor 10 onto the suction cups 32, its surface sticks to at least one of these suction cups.
  • the movement of the carriage in the direction indicated by the arrow 44 in FIG. 3 results firstly in a displacement of the support 34 in the direction indicated by the arrows 46 in a substantially vertical direction, this displacement being able to be very rapid when the first part 42 a of the raceway 42 forms an angle close to 90 ° with the second part 42b of this raceway, then by a displacement of the support 34 and of the object 12 in the direction indicated by the arrow 48.
  • the object 12 is thus very quickly removed from the stack of objects on the conveyor 10, then is moved in the direction indicated by the arrow 48 until it is taken up by the second conveyor 20.
  • the second phase of movement, in the direction of arrow 48, allows the retaining wall 18 a to pass through the object 12 carried by the suction cups 32 and takes place at a slower speed, substantially equal to that of movement of the carriage 38.
  • the following objects in the stack cannot be driven in this direction, since they are retained by the wall 18a.
  • Regulation and safety means are also provided at the junction between the two conveyors. These means comprise for example two flaps 50 and 52, arranged across the first conveyor 10 and whose upper edges are articulated around the same axis 54 parallel to the aforementioned direction 22. These flaps 50 and 52 are interposed between the stacks of objects 12 carried by the conveyor 10 and the means 30 for picking up the objects one by one.
  • the flap 50 therefore comprises a cutout 56 having the shape shown in FIG. 4, which allows the passage and movement of the suction cups 32 of the means 30, while the flap 52 comprises a cutout 58 allowing the passage of the separation plates 16 of the conveyor 10
  • Their operation is as follows:
  • the flap 52 serves only as a safety device and controls the stopping of the device when it has been moved over a predetermined distance.
  • the flaps 50 and 52 thus guarantee the safety of an operator who can sometimes have to engage his hand in the vicinity of the object gripping means.
  • FIG. 5 shows in detail a preferred embodiment of the object pickup means.
  • each suction cup 32 is mounted at the end of a tube 60 which ends at its opposite end by a cylindrical rod 64 of smaller diameter.
  • the tube 60 and the rod 64 are guided in reciprocating rectilinear movement in the support 34 by means of ball bushings 66, to reduce friction.
  • the free end of the cylindrical rod 64 is associated with a piston 68 mounted in a cylindrical chamber 70 of the support 34 and associated with a compression spring 72 so that, when the chamber 70 is supplied with gas under pressure, the piston 68 is moved to the right and compresses its spring 72 and, when the chamber 70 is exhausted, the spring 72 brings the piston to the left end of the chamber 70.
  • the cylindrical rod 64 is mounted free in translation by relative to the piston 68 through an opening in the bottom thereof and comprises a head 74 with a diameter greater than this opening, forming a retaining member.
  • the tube 60 is also associated with a compression spring 76, urging it permanently to the right in FIG. 5 and therefore having an action opposite to that of the spring 72, with a weaker force.
  • the junction between the cylindrical rod 64 and the tube 60 is located in a chamber 78 formed in the support 34 and connected to a source of vacuum. Radial orifices formed through the wall of the tube 60 allow communication between the interior of the tube and the chamber 78.
  • a solenoid valve controls the supply of chamber 70 with pressurized gas. Simultaneously, this solenoid valve also controls the supply of the chamber 78 with vacuum.
  • the piston 68 is then moved to the right in FIG. 5 by compressing its spring 72, and the rod 64 and the tube 60 carrying the suction cup 62 are returned to their extreme right position, by relaxation of the spring 76.
  • the vacuum prevailing in the chamber 78 results in continuous suction inside the suction cup 32 and the tube 60.
  • a vacuum is created inside the tube 60 and in the chamber 78.
  • each object gripping means automatically adapts to the thickness of the object to be grasped, and that the following objects in the stack are not packed together when the first object in the stack is picked up.
  • the two suction cups 32 of the object pickup means 30 are independent of one another, both in terms of their position relative to their common support 34 and in terms of the suction or depression, which makes it possible to efficiently grasp objects with an irregular surface.
  • vent holes 80 are formed in the support 34 at the level of the ball bushings 66, on either side of the vacuum chamber 78. As the rod 64 and the tube 60 are not mounted with a very rigorous sealing at the crossing of the walls of the chamber 78, this avoids, by the presence of these vent holes 80, the suction of dust and other dirt inside the ball bushings.
  • each vacuum source is formed by an ejector 82, which is supplied by the same gas pressure as the chamber 70, controlled by an electro-valve 84.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
  • Credit Cards Or The Like (AREA)
  • Making Paper Articles (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)

Claims (9)

1. Vorrichtung zum Entnehmen verhältnismäßig flacher Gegenstände, wie Briefe oder Postumschläge mit veränderlichen Längen, Breiten und Dicken aus einem Stapel, die aufweist: einen ersten Förderer (10) zum Zuführen von Stapeln der Gegenstände (12), die entlang einer Rückhaltewand (18, 18a) geführt werden, gegen die sie über einen ihrer Ränder angelegt werden, Mittel (30) zum Trennen und Nehmen von Gegeständen nacheinander an einem Ende des ersten Förderers (10), um einen zweiten, die Gegenstände nacheinanderfolgend in eine zu jener des ersten Förderers senkrechte Richtung fördernden Förderer (20) zu beschicken, wobei die Mittel (30) einerseits Mittel (32) zum Nehmen, die sich an dem ersten Gegenstand des Stapels anlegen und andererseits Mittel (36, 38, 40, 42) aufweist, um die Mittel (32) zum Nehmen in Bezug auf den ersten Förderer zu verschieben, dadurch gekennzeichnet, daß die Mittel (32) zum Nehmen eines Gegenstands von einem Schlitten (38) getragen werden, der in einer zu der Richtung (14) des ersten Förderers (10) senkrechten Ebene verschoben werden kann, und die entsprechend einer Verschiebung in dieser Ebene in einer ersten zu den Richtungen der zwei Förderer senkrechten Richtung (46), um einen Gegenstand (12) über die Rückhaltewand (18a) zu befördern, sodann in einer zweiten, zu jener des zweiten Förderers (20) parallelen Richtung (48) geführt werden, um den Gegenstand (12) auf den zweiten Förderer zu befördern.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie Mittel (40, 42a) aufweist, um die Verschiebung der Mittel (32) zum Nehmen eines Gegenstands in die erste vorgenannte Richtung (46) zu beschleunigen.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Mittel (32) zum Nehmen in Bezug auf einen Träger (34) in eine Richtung beweglich sind, die parallel zu der Richtung (14) für das Vorwärtsbewegen der Stapel auf dem ersten Förderer (10) liegt.
4. Vorrichtung nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, daß die Mittel (32) zum Nehmen über zwei parallele Gelenkarme (36) mit dem Schlitten (38) verbunden sind, bei welchem einer eine Rolle (40) trägt, die in einer gekrümmten Rollbahn (42) geführt ist.
5. Vorrichtung nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, daß die Mittel zum Nehmen zumindest einen Sauger (32) aufweisen, der an dem Ende einer Röhre (60) angebracht ist, die entsprechend einer Translation in einem Träger (34) geführt ist und der mit einer Rückstellfeder (76) verbunden ist, die ihn ständig gegen den Stapel von Gegenständen drückt.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Träger (34) eine Kammer (78) aufweist, die mit einer Quelle für Unterdruck verbunden und von der den Sauger (32) tragenden Röhre (60) durchdrungen ist, wobei diese Röhre einen Teil (64) mit einem reduzierten Durchmesser aufweist, der sich innerhalb der Kammer (78) so erstreckt, daß sich durch die Schaffung des Unterdrucks in der Kammer (78), der Röhre (60) und dem Sauger (32) eine Verschiebung der Röhre (60) in eine zu jener der Wirkung der Rückstellfelder (76) entgegengesetzte Richtung ergibt und die Wirkung der Rückstellfeder annähernd im Gleichgewicht gehalten wird.
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Mittel zum Nehmen zwei Sauger (32) aufweisen, die von unabhängigen Quellen für Unterdruck gespeist werden.
8. Vorrichtung nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, daß sie Platten oder Klappen (50, 52) aufweist, die um eine, zu der Richtung für das Vorwärtsbewegen der Stapel senkrechte Achse (54) drehbar auf der Höhe der Mittel (30) zum Trennen und Nehmen von Gegenständen angebracht sind, um als Mittel für Regulierung einer Vorwärtsbewegung und für Sicherheit zu dienen.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß eine (50) der Klappen einen Ausschnitt (56) für einen Durchgang der Mittel (32) zum Nehmen eines Gegenstands aufweist.
EP88401308A 1987-05-27 1988-05-27 Vorrichtung zum Entstapeln von verhältnismässig flachen Gegenständen, wie Briefen oder Postumschlägen Expired - Lifetime EP0295170B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401308T ATE70249T1 (de) 1987-05-27 1988-05-27 Vorrichtung zum entstapeln von verhaeltnismaessig flachen gegenstaenden, wie briefen oder postumschlaegen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707527 1987-05-27
FR8707527A FR2615840B1 (fr) 1987-05-27 1987-05-27 Dispositif de depilage d'objets relativement plats, tels que des lettres ou des plis postaux

Publications (2)

Publication Number Publication Date
EP0295170A1 EP0295170A1 (de) 1988-12-14
EP0295170B1 true EP0295170B1 (de) 1991-12-11

Family

ID=9351541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401308A Expired - Lifetime EP0295170B1 (de) 1987-05-27 1988-05-27 Vorrichtung zum Entstapeln von verhältnismässig flachen Gegenständen, wie Briefen oder Postumschlägen

Country Status (6)

Country Link
US (1) US4867430A (de)
EP (1) EP0295170B1 (de)
AT (1) ATE70249T1 (de)
DE (1) DE3866791D1 (de)
ES (1) ES2029049T3 (de)
FR (1) FR2615840B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1256935B (it) * 1992-08-10 1995-12-27 Vincenzo Priolo Dispositivo di smistamento singolo per oggetti postali.
IT1255541B (it) * 1992-10-09 1995-11-09 Alcatel Italia Dispositivo per singolarizzare articoli raggruppati in pile
IT1266198B1 (it) * 1994-08-12 1996-12-23 Finmeccanica Spa Dispositivo di smistamento singolo per oggetti postali
US6354583B1 (en) 1999-01-25 2002-03-12 Bell & Howell Mail And Messaging Technologies Company Sheet feeder apparatus and method with throughput control
US20030014376A1 (en) * 2001-07-13 2003-01-16 Dewitt Robert R. Method and apparatus for processing outgoing bulk mail
US7012210B2 (en) * 2002-08-09 2006-03-14 Lockheed Martin Corporation Singulation detection system for objects used in conjunction with a conveyor system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH340838A (de) * 1955-04-13 1959-09-15 Spiess Georg Ing Dr Vorrichtung zum Abheben und Zuführen des jeweils obersten Bogens eines Stapels in eine Bogen verarbeitende Maschine
US3146902A (en) * 1961-08-30 1964-09-01 Saxton V Voelker Envelope emptying and contents stacking machine
FR2123659A5 (de) * 1971-01-27 1972-09-15 Thomson Houston Hotchkis
US3885784A (en) * 1971-01-27 1975-05-27 Thomson Csf Document singling arrangement
CH518226A (de) * 1971-06-11 1972-01-31 Strausak Ag Einrichtung zur Einzelentnahme blattförmiger Gegenstände von einem Stapel
DE2249412C3 (de) * 1972-10-09 1975-06-19 Mabeg Maschinenbau Gmbh Nachf. Hense & Pleines Gmbh & Co, 6050 Offenbach Sauger am Saugkopf für Bogenanleger
US4189137A (en) * 1978-04-14 1980-02-19 The Mccall Pattern Company Vacuum pickup device
JPS567848A (en) * 1979-06-26 1981-01-27 Ricoh Co Ltd Sucking type paper feeder
US4346876A (en) * 1980-05-12 1982-08-31 Bell & Howell Company Vacuum document feeder
FR2576530B1 (fr) * 1985-01-30 1987-08-07 Hotchkiss Brandt Sogeme Separateur d'objets plats large spectre
DE3508736A1 (de) * 1985-03-12 1986-09-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Vorrichtung zum vereinzeln und zum transport des jeweils obersten blattes eines stapels von blaettern oder blattfoermigen gegenstaenden

Also Published As

Publication number Publication date
FR2615840A1 (fr) 1988-12-02
EP0295170A1 (de) 1988-12-14
FR2615840B1 (fr) 1990-06-08
US4867430A (en) 1989-09-19
DE3866791D1 (de) 1992-01-23
ATE70249T1 (de) 1991-12-15
ES2029049T3 (es) 1992-07-16

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