EP2041706B1 - Procédé et dispositif pour identifier les extrémités d'objets mobiles - Google Patents

Procédé et dispositif pour identifier les extrémités d'objets mobiles Download PDF

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Publication number
EP2041706B1
EP2041706B1 EP07790103A EP07790103A EP2041706B1 EP 2041706 B1 EP2041706 B1 EP 2041706B1 EP 07790103 A EP07790103 A EP 07790103A EP 07790103 A EP07790103 A EP 07790103A EP 2041706 B1 EP2041706 B1 EP 2041706B1
Authority
EP
European Patent Office
Prior art keywords
feed surface
objects
sensor
height
feed
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.)
Not-in-force
Application number
EP07790103A
Other languages
German (de)
English (en)
Other versions
EP2041706A1 (fr
Inventor
Federico Giudiceandrea
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.)
Microtec SRL
Original Assignee
Microtec SRL
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 Microtec SRL filed Critical Microtec SRL
Publication of EP2041706A1 publication Critical patent/EP2041706A1/fr
Application granted granted Critical
Publication of EP2041706B1 publication Critical patent/EP2041706B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M7/00—Counting of objects carried by a conveyor
    • G06M7/02—Counting of objects carried by a conveyor wherein objects ahead of the sensing element are separated to produce a distinct gap between successive objects
    • G06M7/04—Counting of piece goods, e.g. of boxes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M7/00—Counting of objects carried by a conveyor
    • G06M7/08—Counting of objects carried by a conveyor wherein the direction of movement of the objects is changed at the station where they are sensed

Definitions

  • the present invention relates to a method and a device for identifying the ends of moving objects.
  • the present invention relates to a method and a device for identifying the ends of moving objects which can be applied particularly in the woodworking sector, but which can also be used in any other sector.
  • the objects transported have a regular shape and are all substantially the same as one another, as is the case when transporting wooden planks in sawmills, it is impossible to distinguish between two objects positioned one after the other transported with their ends in contact with one another.
  • the objects must be transported so that they are spaced, to identify, for example with proximity sensors, the end of one object and the start of the next object.
  • the main technical purpose of the present invention is to propose a method and a device for identifying the ends of moving objects which is free of the above-mentioned disadvantages.
  • the present invention has for an aim to provide a method and a device for identifying the ends of moving objects which are transported with their ends in contact with one another.
  • the present invention also has for an aim to propose a method and a device for identifying the ends of moving objects which maximises the flow of objects transported in the unit of time.
  • the numeral 1 denotes as a whole a device for identifying the ends of moving objects.
  • the device 1 comprises a first feed surface 2, substantially horizontal, on which objects 100 to be transported along a direction of transport T are fed.
  • the objects 100 are unmachined or semifinished sawmill products, such as wooden planks, panels and the like.
  • the objects 100 are fed to the first feed surface 2 with their ends in contact with one another, that is to say drawn near and in contact with one another.
  • the objects 100 may be transported along the first feed surface 2 either by pushing the last of the objects fed, which, in turn, pushes the objects already fed, thanks to the fact that the objects 100 have their ends in contact with one another, or using suitable movement means associated with the first feed surface.
  • the first feed surface 2 may not need any movement means to feed the objects 100, making it simple and economical to produce and install.
  • the first feed surface 2 may comprise a plurality of idle rollers having an axis of rotation perpendicular to the direction of transport T, so that the objects 100 can run on them without meeting too much resistance.
  • the idle rollers of the first feed surface 2 may be substituted by any other passive device, that is to say a device that does not require movement means, able to reduce the sliding friction of the objects 100 on the feed surface.
  • the device 1 also comprises a second feed surface 3, substantially horizontal, for transporting objects 100 arriving from the first feed surface 2.
  • the second feed surface 3 is adjacent to the first feed surface 2, in particular it begins substantially where the first feed surface 2 finishes.
  • the second feed surface 3 may also have idle rollers similar to or the same as the idle rollers described with reference to the first feed surface 2, since the second feed surface 3 may also not need any movement element to feed the objects 100. In any case, the second feed surface 3 may also be equipped with suitable object 100 movement means.
  • the second feed surface 3 is preferably positioned at a height lower than the first feed surface 2, so that the objects 100 pass from the first feed surface 2 to the second feed surface 3 by simply dropping down.
  • the height of the step 5 is preferably less than the height of the objects 100 transported. In other words, when the objects 100 are positioned on the second feed surface 3 they extend at least partly beyond the step 5, reaching a height greater than the height of the first feed surface 2. This solution is in particular used if there are no object movement means associated with the second movement surface 3.
  • the device 1 also comprises a sensor 6 operatively associated with the transition zone (step 5) between the first and second feed surfaces 2, 3 for at least one end of each object 100.
  • the sensor 6 is immediately downstream of the step 5, relative to the direction of transport T, so as to detect the objects 100 as soon as they pass from the first to the second conveyor.
  • the operating part of the sensor 6 does not extend beyond the height of the step 5, so that it does not intercept objects 100 projecting beyond the first feed surface 2 and still at the same height as said surface.
  • the senor 6 is an optical sensor, for example a photocell or a proximity sensor.
  • the senor 6 may be a mechanical sensor, for example a feeler or a switch which is pressed by an object 100 as it passes onto the second feed surface 3 and released once said transfer is complete.
  • the sensor can detect the rear end (with reference to the direction of feed) of each object 100 which has just passed onto the second feed surface 3, according to the methods indicated below.
  • the senor 6 is instead positioned, again immediately downstream of the step 5, but at a height greater than the height of the objects 100 positioned on the second feed surface 3, yet lower than the height of the objects 100 positioned on the first feed surface 2. In this way, the sensor 6 can detect the front end of each object 100 about to pass from the first to the second feed surface 2, 3.
  • the method involves feeding a plurality of objects (100) placed with their ends in contact with one another along a path and creating a misalignment between two objects (100) fed along the path in order to at least partly expose the ends of the objects (100).
  • the misalignment may be created vertically by means of a difference in height 4, as described above, or transversally (in the latter case the situation corresponds to that described but is rotated through 90° about the direction of feed).
  • the method disclosed involves a further step of detecting the end of at least one of the objects (100) positioned at the misalignment zone.
  • the method involves feeding a plurality of objects 100, with their ends in contact with one another, along the first feed surface 2.
  • the objects 100 are arranged in a single row and may be moved by pushing the upstream object of said row, relative to the direction of transport T.
  • the objects 100 proceed along the first feed surface 2 in the direction of transport T until each object in the row reaches the difference in height 4 which connects the first and second feed surfaces 2, 3.
  • the object projects cantilever-style beyond the difference in height 4, supported by the first feed surface 2 by means of the portion of object still resting on it.
  • This step is illustrated in Figure 4 by the object 100 seen on the left.
  • the sensor 6 can usually also detect the presence of the object 100 which is passing onto the second feed surface 3, without this compromising the desired result, as described in more detail below.
  • the second end 100b of the object also drops onto the second feed surface 3.
  • the sensor 6 therefore detects the presence of an object 100 on the second feed surface 3.
  • the object gradually uncovers the sensor 6, without another object 100 covering the sensor.
  • the object positioned immediately upstream of the object just transferred to the second feed surface 3 projects cantilever-style from the step 5.
  • the object 100 positioned on the first feed surface 2 can push the object positioned on the second feed surface 3 along a first portion 100c of the second end 100b of the latter, as illustrated in Figure 4 .
  • the end portion 100d complementing the end portion 100c of the object 100 positioned on the second feed surface 3 uncovers the sensor 6, which provides an accurate indication of the end of the object 100.
  • the senor 6 is positioned above the objects 100 positioned on the second feed surface 3. In this case, when an object 100 drops onto the second feed surface 3 (position of the objects 100 corresponding to that in Figure 3 ), it uncovers the sensor which is therefore able to detect the start of the object which is about to pass from the first to the second feed surface 2, 3, as soon as it is fed forward (reaching the position in Figure 3 ).
  • the position of the sensor 6 along the direction of transport T depends on the length of the objects 100 to be transported, in particular, the shorter said objects, the closer to the step 6 the sensor 6 must be positioned.
  • the invention achieves the preset aims.
  • the device and method disclosed guarantee identification of the ends of moving objects which are transported with their ends in contact with one another.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Conveyors (AREA)
  • Radar Systems Or Details Thereof (AREA)

Claims (16)

  1. Procédé permettant l'identification des extrémités d'objets mobiles, comprenant les phases suivantes:
    acheminement d'une pluralité d'objets (100) placés de telle sorte que leurs extrémités soient au contact l'une avec l'autre sur un parcours;
    création d'un désalignement entre deux objets (100) acheminés sur le parcours de façon à exposer au moins partiellement les extrémités des objets désalignés(100);
    détection de l'extrémité d'au moins l'un des objets (100) présents dans la zone de désalignement, au moyen d'un capteur (6) présent dans la zone de désalignement ;
    caractérisé en ce que
    ladite phase de création d'un désalignement est obtenue en créant une différence de hauteur (4) sur le parcours et comprenant une phase consistant à faire passer chaque objet (100) d'une première surface d'alimentation substantiellement horizontale (2) à une seconde surface d'alimentation substantiellement horizontale (3) placée à une hauteur différente;
    ladite phase de détection implique que le capteur (6) détecte l'extrémité arrière de l'objet (100) qui vient juste de passer sur la seconde surface d'alimentation (3).
  2. Procédé selon la revendication 1, dans lequel la phase de création du désalignement comprend une phase consistant à faire passer chaque objet (100) de la première surface d'alimentation (2) à une seconde surface d'alimentation (3) placée plus bas.
  3. Procédé selon la revendication 2, dans lequel la phase d'alimentation des objet (100) vers la seconde phase d'alimentation (3) comprend une phase consistant à faire passer un objet (100) à la fois de la première surface d'alimentation (2) sur la seconde surface d'alimentation (3).
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel la phase de création du désalignement est effectuée de façon à garder l'objet (100) situé en amont, par rapport au parcours d'alimentation, au contact de la première extrémité (100c) de l'objet situé en aval (100).
  5. Procédé selon la revendication 4, dans lequel la phase de détection comprend la détection d'une seconde extrémité (lOOd), séparée de la première extrémité (100c), de l'objet situé en aval (100).
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel chaque objet (100) est poussé par l'objet immédiatement précédent.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'objet est détecté de façon optique.
  8. Procédé selon l'une quelconque des revendications 1 to 7, dans lequel l'objet est détecté de façon mécanique.
  9. Dispositif permettant l'identification des extrémités d'objets mobiles, comprenant:
    une première surface d'alimentation substantiellement horizontale (2) destinée au transport des objets (100) placés l'un après l'autres de telle sorte que leurs extrémités se trouvent au contact l'une de l'autre;
    une seconde surface d'alimentation substantiellement horizontale (3)destinée au transport des objets (100) placés l'un après l'autre en provenance de la première surface d'alimentation (2); ladite seconde surface d'alimentation (3) étant adjacente à la première surface d'alimentation (2); et
    un capteur (6) ;
    caractérisé en ce que
    il existe une différence de hauteur (4) entre la première surface d'alimentation (2) et la seconde surface d'alimentation (3); et
    ledit capteur (6) est associé dans son fonctionnement avec la différence de hauteur (4) et qu'il peut détecter l'extrémité arrière de l'objet (100) qui vient de passer sur la seconde surface d'alimentation (3).
  10. Dispositif selon la revendication 9, dans lequel la seconde surface d'alimentation (3) est placée plus bas que la première surface d'alimentation (2).
  11. Dispositif selon la revendication 10, dans lequel la différence de hauteur (4) est inférieure à la hauteur des objets (100) à transporter.
  12. Dispositif selon l'une quelconque des revendications 9 à 11, dans lequel le capteur (6) est placé immédiatement en aval de la différence de hauteur (4) à une hauteur inférieure à celle de la première surface d'alimentation (2) pour détecter uniquement les objets (100) transférés sur la seconde surface d'alimentation (3).
  13. Dispositif selon l'une quelconque des revendications 9 à 12, dans lequel le capteur (6) est optique.
  14. Dispositif selon l'une quelconque des revendications 9 à 12, dans lequel le capteur (6) est mécanique.
  15. Dispositif selon l'une quelconque des revendications 9 à 14, dans lequel la première et la seconde surfaces d'alimentation (2, 3) comprennent une pluralité de rouleaux fous sur lesquels les objets(100) peuvent avancer.
  16. Dispositif selon l'une quelconque des revendications 9 à 14, dans lequel au moins la première surface d'alimentation (2. 3) comprend des moyens de mouvement de l'objet (100).
EP07790103A 2006-07-19 2007-05-28 Procédé et dispositif pour identifier les extrémités d'objets mobiles Not-in-force EP2041706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000124A ITVR20060124A1 (it) 2006-07-19 2006-07-19 Metodo e dispositivo per identificare le estremita' di oggetti in movimento.
PCT/IT2007/000371 WO2008010249A1 (fr) 2006-07-19 2007-05-28 Procédé et dispositif pour identifier les extrémités d'objets mobiles

Publications (2)

Publication Number Publication Date
EP2041706A1 EP2041706A1 (fr) 2009-04-01
EP2041706B1 true EP2041706B1 (fr) 2009-10-28

Family

ID=38543747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07790103A Not-in-force EP2041706B1 (fr) 2006-07-19 2007-05-28 Procédé et dispositif pour identifier les extrémités d'objets mobiles

Country Status (5)

Country Link
EP (1) EP2041706B1 (fr)
AT (1) ATE447214T1 (fr)
DE (1) DE602007003029D1 (fr)
IT (1) ITVR20060124A1 (fr)
WO (1) WO2008010249A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH544972A (de) * 1971-11-11 1973-11-30 Sig Schweiz Industrieges Vorrichtung zum Überwachen von Gegenständen
US5072099A (en) * 1989-08-31 1991-12-10 Fischer-Flack, Inc. Container counting apparatus

Also Published As

Publication number Publication date
WO2008010249A1 (fr) 2008-01-24
EP2041706A1 (fr) 2009-04-01
ITVR20060124A1 (it) 2008-01-20
ATE447214T1 (de) 2009-11-15
DE602007003029D1 (de) 2009-12-10

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