Patent Publication Number: US-2022219931-A1

Title: Apparatus for handling and collecting a plurality of substantially bi-dimensional objects

Description:
FIELD OF THE INVENTION 
     The present invention relates to the field of the handling of bi-dimensional objects, such as closed shape objects that are cut from a bi-dimensional layer, e.g. paper or fabric. 
     BACKGROUND OF THE INVENTION 
     It is known that similar objects are conveyed on the upper surface of a conveyor, where typically a cutting operation occurs, at the end of which these elements are deposited in a collecting device. Without any further intervention, the objects (due their low thickness and weight) would be deposited one onto the other in a substantially random manner, and they may also fold after being released from the conveyor. 
     This is not helpful for subsequent operation on the objects, in particular if the objects are pieces of fabric that subsequently undergo further process for example sewing process to form a garment or a clothing article. It is thus known to provide a human intervention at the end of the conveyor, in order to manually remove the objects from the conveyor and to place them in a correct position in a relevant collecting area. This is clearly an expensive, uncomfortable and inaccurate operation. 
     It is thus an object of the present invention to provide a solution to the above-mentioned problem. 
     It is in particular an object of the present invention to provide a solution that provides a precise and accurate positioning of the bi-dimensional objects. 
     It is another object of the present invention to provide the above-mentioned solution in a manner that can be implemented also in existing machines. 
     It is also an object of the present invention to provide a machine (or system) for cutting bi-dimensional objects from layers, allowing a precise and accurate positioning of the obtained bi-dimensional objects. 
     SUMMARY OF THE INVENTION 
     These and other objects are achieved by the present solution according to one or more of the enclosed claims. 
     Objects of the present invention are in particular a handling and collecting apparatus, a machine, a process for handling and collecting a plurality of bi-dimensional objects, a process for cutting a plurality of bi-dimensional objects from a layer, according to claims  1 ,  8 ,  14  and  15  respectively. Preferred aspects are recited in the other dependent claims. 
     According to an aspect, a handling and collecting apparatus for handling and collecting a plurality of substantially bi-dimensional objects, preferably made of fabric or paper, comprises: a conveyor, arranged to receive the bi-dimensional object from a source, and configured to provide a holding force to draw and hold the bi-dimensional objects from above in use condition; a disengagement device, configured to temporarily oppose the holding force on at least a portion of the conveyor, to disengage the bi-dimensional objects from the conveyor, causing the fall of the bi-dimensional objects towards a collecting area. 
     It has to be noted that the expression “provide a holding force to draw and hold the bi-dimensional objects from above” is used here to indicate that the bi-dimensional objects are not supported from below (e.g. they are not arranged on the upper surface of a conveyor). The expression is therefore herein used to indicate a drawing and holding force that is able to drawn and retain the bi-dimensional objects in opposition to the gravity force, e.g. against and below a lower surface of the conveyor that is facing the ground or a reference plane towards which the bi-dimensional objects would fall in absence of the holding force. In other words, according to the invention the bi-dimensional objects are not supported on the upper surface of conveyor, while they are drawn and hold to a surface of the conveyor facing the ground so that they are transported in a suspended condition, i.e. without support elements acting from below the bi-dimensional object. 
     In particular, the disengagement device is typically configured to substantially nullify the holding force, or in any case to reduce it, so that the bi-dimensional object falls by gravity. In other words, the term “oppose the holding force” is used herein to indicate that disengagement device causes the holding force to no longer act (or act in a reduced manner, for example by reducing the magnitude of the holding force) on at least portion of the conveyor. 
     It has been verified that, thanks to the claimed solution, the pattern of the falling of the bi-dimensional objects is substantially constant, i.e. it is repeated in substantially the same manner for subsequent bi-dimensional objects that are handled by an apparatus according to the present invention. 
     As a result, the bi-dimensional objects can be evenly collected (typically stacked) in a relevant collecting area. 
     As mentioned, the conveyor is provided with one or more elements (device) providing said holding force to draw and hold the bi-dimensional objects from above in use condition. 
     According to an aspect, the conveyor is provided with vacuum elements (aspiration elements) configured to suck air from the environment against the conveyor, thus providing the holding force so as to draw the bi-dimensional objects against the conveyor. 
     According to an aspect, the conveyor is provided with a belt, preferably a belt with one or more holes or apertures, more preferably a foraminous belt. 
     According to an aspect, the disengagement device comprises a movable element, movable between at least a first position and a second position, wherein in the second position the movable element opposes the holding force. 
     In the first position, the interaction between the holding force and the disengagement device is substantially null, or minimum, i.e. the operation of the holding force is substantially not affected by the disengagement device. When the disengagement device is in the first position, the bi-dimensional objects are thus held by the holding force against the conveyor. 
     When the disengagement device is in the second position, there is an interaction between the holding force and the disengagement device so that, on at least a portion of the conveyor, the holding force is no longer applied (or it is applied in a low manner, reduced with respect to when the disengagement device was in the first position), so that the bi-dimensional objects that are placed at such a portion of the conveyor, are released by the conveyor due to gravity, and fall towards a relevant collecting area. 
     In particular, in case of vacuum elements, in the second position the disengagement device may be placed in a position that substantially interrupts the air flow at a certain area of the conveyor. 
     According to possible embodiments, the disengagement device comprises a movable element that is provided with one or more holes (or apertures). According to an aspect, the movable element is configured as a shutter intended to a selectively open/close at least a portion of a hole or opening or passage for said air flow. Said at least one hole or opening or passage for said air flow can be provided on second element (for example a plate) cooperating with said movable element, and provided with one or more holes (or apertures). 
     According to an aspect, the movable element is movable with respect to a plate provided with one or more holes (or apertures), so that in the first position, the holes of the movable element are at least partially aligned with respect to the holes of the plate, allowing air to pass through both the holes of the movable element and of the plate, while in the second position, the holes of the movable element and of the plate are at least partially (or completely) misaligned, preventing air from passing through the holes, or allowing the passage of an amount of air that is less than the one of the first position. 
     In a possible embodiment, the movable element is movable in a slidable manner, so that it is movable between a retracted condition and an extracted condition (corresponding to the above mentioned first and second positions). 
     According to an aspect, the movable element is arranged so that, in use condition, the belt is interposed between the bi-dimensional objects and the movable element. 
     The disengagement device thus does not touch the bi-dimensional objects, that may be damaged (or at least moved and/or folded in a random, and thus undesired, manner) by such a contact. 
     An aspect of the present invention also relates to a machine (or system) for processing bi-dimensional objects comprising: a machine conveyor for moving a layer of material preferably along a substantially horizontal direction; a handling and collecting apparatus according to any of the preceding aspects, wherein the above-mentioned source of the bi-dimensional objects is the machine conveyor. 
     According to possible embodiments, the machine further comprises a cutting device, configured to carry out a cut along a plurality of different path (preferably closed path) in the layer, so as to divide the layer into a plurality of bi-dimensional objects and a waste layer surrounding the bi-dimensional objects. Possibly, the machine is also provided with a waste collecting apparatus, for separating the waste layer from the bi-dimensional objects and preferably for also removing the waste layer from the machine conveyor. 
     According to possible embodiments, the machine conveyor comprises a machine belt and a machine vacuum element configured to suck air from the environment against the belt, so as to draw the bi-dimensional objects against the machine belt. 
     According to possible embodiments, in plant view, considering the use condition, a portion of the machine conveyor overlaps a portion of the conveyor of the handling and collecting apparatus. 
     According to possible embodiments, the cutting device is a laser cutting device. 
     According to possible embodiments, the cutting device is movable along at least one, preferably two different directions that are substantially perpendicular with respect to a vertical line, considering the use condition. In other words, the cutting device is movable along two different directions, e.g. in a plane that is preferably parallel with respect to the plane of the machine conveyor on which the bi-dimensional objects are transported. 
     An aspect of the present invention relates to a process for handling and collecting a plurality of bi-dimensional objects comprising the steps of: i. moving the bi-dimensional objects from a source to a conveyor, the conveyor holding the bi-dimensional objects from above via a holding force; ii. opposing the holding force on at least a portion of the conveyor to disengage the bi-dimensional objects from the conveyor, causing the fall of the bi-dimensional objects. 
     Such a process can be implemented in a process for cutting a plurality of bi-dimensional objects from a layer, that comprises the steps of: a. cutting the layer along a plurality of different path (preferably closed path), so as to divide the layer into a plurality of bi-dimensional objects and a waste layer surrounding the bi-dimensional objects; b. separating the waste layer from the bi-dimensional objects and removing the waste layer from the machine conveyor; c. performing steps i-ii of the above discussed process. 
     According to possible embodiments, the layer is a fabric, and preferably the bi-dimensional objects are cut along patterns for garments. 
     According to possible embodiments, the layer is paper or cardboard and preferably the bi-dimensional objects are blanks. 
    
    
     
       DESCRIPTION OF THE FIGURES 
       One or more embodiments of the present invention are now described in greater detail with reference to the accompanying drawings provided by way of non-limiting example, wherein: 
         FIG. 1  is a schematic lateral view of a handling apparatus, arranged in a machine for processing bi-dimensional objects comprising, according to a possible embodiment of the present invention. A top view of a detail of  FIG. 1  is visible in the dotted rectangle; 
         FIG. 2  is a perspective view of a disengagement device of an embodiment of the present invention, in the first position; 
         FIG. 3  is a perspective view of the disengagement device of  FIG. 2 , in the second position; 
         FIG. 4  is a schematic perspective view of a possible embodiment of a handling apparatus, arranged in a machine for processing bi-dimensional objects, according to a possible embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     With reference to figure, a handling and collecting apparatus  1  (from now on also “handling apparatus  1 ”) for handling and collecting a plurality of substantially bi-dimensional objects  100  (from now on also “objects  100 ”) comprises a conveyor  2 , arranged to receive the objects  100  from a source (e.g. the machine conveyor  11  of a machine (or system)  10 , better discussed later), and configured to provide a holding force F to draw and hold the bi-dimensional objects  100  from above in use condition. The objects  100  are substantially bi-dimensional, so that they have a reduced thickness with respect to the other dimensions. 
     As an example, the objects  100  can be pieces of a fabric, e.g. pieces cut along patterns for garments or clothing article. As a further example, the bi-dimensional objects can be paper or cardboard blanks that may be subsequently folded to obtain three-dimensional objects (e.g. bags or containers). 
     According to an aspect, the conveyor  2  is provided with a surface (preferably the surface of a belt  2   a ) where the bi-dimensional objects are drawn and hold by the holding force. The conveyor surface (or conveyor belt) is preferably horizontal, or substantially horizontal, with respect to the ground or with respect to a reference plane on which the handling apparatus is arranged, or with respect to a plane on which the bi-dimensional objects have to be collected. 
     The conveyor  2  can be any conveyor element known in the art that is configured to move the objects  100 , typically along a substantially horizontal direction. Preferably, the conveyor comprises an endless belt  2   a , that is continuously moved along a closed path. The conveyor  2  is typically arranged to hold the objects  100  from above, i.e. it is arranged so that, during use, the objects  100  are drawn and hold to the conveyor  2  in opposition to the gravity force, e.g. against and below the lower surface of the conveyor (such as for example the endless belt  2   a  of the conveyor). As mentioned, this is obtained via a holding force F, that draws the objects  100  against the conveyor  2  so that they cannot fall under the gravity force. 
     The holding force F is typically a distributed force, i.e. a force that acts on an area, instead of on a single application point. Preferably, the holding force F is provided by one or more vacuum elements (aspiration elements)  3 . As an example, a vacuum element  3  can comprise one or more blowers (not shown in detail) that cause a flow of air directed upwards. As a result, a depression is caused under the vacuum elements, that draws the objects  100  against the conveyor  2 . 
     Other kinds of vacuum elements, e.g. aspirators or similar means, can be used to draw the objects against the conveyor  2 . 
     It is noted that, for simplicity, elements  3  are called “vacuum” (or aspiration) elements. 
     It is however clear that those elements do not need to create vacuum at the conveyor  2 , as a generic depression may be enough to attract the objects  100  against the conveyor  2 . 
     Typically, when vacuum elements  3  are used, belt  2   a  is provided with one or more holes or apertures, preferably a plurality of holes or apertures, more preferably the belt is a foraminous or porous belt  2   a , i.e. a belt having pores (or holes of small dimension) through which air can pass. In general, the conveyor  2  (and typically the belt  2   a ) is configured so that the depression caused by the vacuum elements  3  reaches the area below the conveyor  2 , i.e. the area where the objects  100  arrive from the relevant source. 
     In different embodiments, not shown in detail, other means for generating a holding force F may be used, e.g. magnetic elements, electrostatic elements, etc. 
     In general, the conveyor  2  is provided with means capable of generating a holding force F that draws the objects  100  against the conveyor  2  itself. The means providing the holding force F typically do not touch (are not in contact with) the objects  100 . 
     The handling apparatus  1  is provided with a disengagement device  4 , configured to temporarily oppose (i.e. contrast) said holding force F on at least a portion of the conveyor  2 , to disengage the objects  100  from the conveyor  2 , causing the fall of the bi-dimensional objects  100  towards a collecting area  5 . 
     The disengagement device  4  preferably comprise a movable element  4   a , movable between a first position and a second position. In the second position (as e.g. the one shown in  FIG. 1 ), the disengagement device  4  opposes the holding force, i.e. causes the holding force to no longer act (or act in a reduced manner) on the conveyor  2 , and in particular on the objects  100  carried by the conveyor  2 . 
     Typically, such an opposition is limited to only a portion of the conveyor  2 . In other words, in preferred embodiment, when the disengagement device is in the second position, there are still areas of the conveyor  2  where the holding force F still draws the objects  100  against the conveyor  2 . This is exemplified in  FIG. 1 , where there is a portion of the conveyor  2  where the holding force is still present (i.e. where the arrows representing the holding force F are shown via a continuous line), and in another portion of the conveyor  2  the presence of the movable element  4   a  contrasts the holding force F (that, in such a portion, is shown via a dotted line), so that the holding force F is no longer capable of keeping the objects  100  attached to the conveyor  2 . 
     The portion of the conveyor  2  affected by the disengagement device  4  is typically downstream (considering the path of the objects  100 ) with respect to the portion of the conveyor  2  that is not affected by the disengagement device  4 . 
     In case of vacuum elements  3 , the movable element  4   a , in the second position, is preferably arranged so as to interrupt (or at least to limit) the flow of air below the movable element  4   a . The depression caused by the vacuum elements  3  thus is no longer present (or it is present in a reduced manner), so that it is no longer enough to maintain the objects  100  against the conveyor  2 , e.g. against the belt  2   a.    
     According to possible embodiments, as for example shown in  FIGS. 2 and 3 , the disengagement device  4  comprises a movable element  4   a , that is provided with one or more holes  4   b . The disengagement device comprises a fixed plate  4   c  (or in any case a plate  4   c  with respect to which the movable element  4   a  is movable), that is also provided with one or more holes  4   d  and that is arranged so that the movable element  4   a  and the plate  4   c  are superimposed one with respect to the other. In a preferred embodiment, as for example shown in the figures, the plate is arranged so that it is interposed between the movable element  4   a  and the conveyor  2 . In the first position, the holes  4   b  of the movable element are at least partially aligned with respect to (typically at least partially superimposed to) the holes  4   d  of the plate  4   c , so that air can pass through both the holes  4   b ,  4   d  of the movable element  4   a  and of the plate  4   c . As a result, a vacuum element  3  (not shown in  FIG. 2 ) can cause a depression under the conveyor  2 , e.g. by sucking air from the environment below the conveyor  2  via tube  4   f.    
     To achieve the above discussed second position, the movable element  4   a  can be moved, e.g. translated, so that the hole  4   b  of the movable element  4   a  are no more aligned with respect to the holes  4   d  of the plate  4   c , so that to prevent air from passing through both the holes  4   b ,  4   d  of the movable element  4   a  and of the plate  4   c . Alternatively, the movable element  4   a  may be moved in the second position so that the holes  4   b  and  4   d  are only partially aligned, allowing the passage of certain amount of air, that is inferior to the amount of air that can pass through holes  4   b ,  4   d  in the first position. As a result, in the second position, the holding force can be null, substantially null, or in any case reduced with respect to the first position. 
     With reference to  FIGS. 2 and 3 , the movable element can be moved from the first position (shown in  FIG. 2 ) along a direction (shown in  FIG. 2  by an arrow) until reaching a position where the holes  4   b ,  4   d  are no more aligned (i.e. they are no more superimposed), thus obtaining the above discussed second position, shown e.g. in  FIG. 3 . 
     In the shown embodiment, a plurality of holes  4   b ,  4   d . The term “hole” should be interpreted broadly, as a general opening passing through the movable element  4   a  or the plate  4   c . It may be the case that both the elements are provided with a single passing through opening, that may have also a non-circular section. In preferred embodiments, however, both the movable element  4   a  and the plate  4   c  are provided with a plurality of holes  4   b ,  4   d . The more the holes are (and smaller the diameter of the holes), faster the passage between the first position and the second position of the movable element can be. The diameter of the holes cannot however reduced too much, otherwise in the first position too little air may pass through the holes, preventing the presence of a holding force as above discussed. 
     As a result, the objects  100  that arrive at the portion of the conveyor  2  placed below the movable element  4   a  fall towards a collecting area  5 . 
     The collecting area may be e.g. placed inside a container  5   a , into which the objects  100  may be collected, e.g. stacked one onto the other. Alternatively, the collecting area  5  may be placed on a further conveyor  5   b  (as for example shown in  FIG. 4 ), onto which a certain number of objects  100  can be grouped, and subsequently moved towards another position. In a possible embodiment, the collecting area  5  may be placed on a conveyor  5   b  that moves the objects along a direction that is angled (e.g. substantially perpendicular) with respect to the movement of the objects on the conveyor  2 , as for example shown in  FIG. 4 . 
     In other possible embodiments, as the one schematically shown in  FIG. 1 , the movable element  4   a  is slidably movable between a retracted position (i.e. the first position) and an extracted position (i.e. the second position). Other kinds of movements, e.g. providing a movable element that is rotatable in a bayonet-like manner, are however possible. 
     The movable element  4   a  is preferably arranged so as not to touch the objects  100 . Preferably, the movable element  4   a  is arranged so that, in its second position, the belt  2   a  of the conveyor  2  is placed between the movable element  4   a  and the objects  100 . 
     The movable element  4   a  can be provided with different kinds of movement. 
     In general, in the first position of the movable element  4   a , the holding force F is not affected by the disengagement device  4 , or in any case is less affected by the disengagement device with respect to the second position. 
     The movement of the movable element is preferably quick enough to suddenly oppose the holding force F, in a manner allowing a quick detachment of the objects  100  from the conveyor. In preferred embodiments, the movable element is movable from the first position to the second position in less than 5 seconds, in more preferred embodiments in less than 3 seconds, in even more preferred embodiments in less than 1 second. 
     The quick movement of the movable elements allow the direction of the fall of the objects  100  to be substantially exclusively vertical, so that the fall of subsequent objects is substantially identical, without any (undesired) folding applied to the objects, that can be stacked one onto the other in a precise manner. 
     According to a possible aspect of the invention, the handling apparatus  1  is coupled to (or part of) a machine (system)  10  for processing the objects  100 . Possible embodiments of the machine  10  are for example shown in  FIGS. 1 and 4 . 
     In particular, the handling apparatus  1  may be coupled to (and become part of) a pre-existing machine  10 . 
     The machine  10  comprises a machine conveyor  11 , that acts as the source of objects  100  for the conveyor  2  of the handling apparatus  1 . 
     It is noted that, for easiness of description, when both the handling apparatus  1  and the machine  10  are provided with similar elements (e.g. conveyors  2  and  11 ), the element of the handling apparatus  1  will be referred as “element” while the element of the machine will be referred as “machine element”. As an example, when reference will be made simply to a “conveyor”, the conveyor  2  of the handling apparatus  1  is meant. On the contrary, the conveyor  11  of the machine  10  will be referred as “machine conveyor  11 ”. 
     The machine conveyor  11  is typically arranged so as to sustain (support) the objects  100  from below, i.e. so that the objects  100  lean on the machine conveyor  11 . The machine conveyor  11  is preferably arranged so that, when the objects  100  pass from the machine conveyor  11  to the conveyor  2 , they move substantially in a horizontal manner, limiting the lifting movement (i.e. the upward movement against gravity). 
     It has to be noted that in the schematic view of  FIG. 4  the conveyor  2  is arranged at a greater distance (i.e. at greater height from the machine conveyor  11 ) with respect to the embodiment shown schematically in  FIG. 1 . In  FIG. 4  the greater distance (height) of the conveyor  2  from the machine conveyor  11  is provided for clarity and illustrative reasons so that it is possible to show the objects  100  released and stacked on another in the collecting area  5  and in particular on the conveyor  5   b . In any case, as mentioned above, it has to be noted that the machine conveyor  11  (and in general the source of objects  100  to be handled) and the conveyor  2  are preferably arranged so that, when the objects  100  pass from the machine conveyor  11  to the conveyor  2 , they move substantially in a horizontal manner, i.e. by limiting the lifting movement (i.e. the upward movement against gravity) of the objects passing from the machine conveyor  11  to the conveyor  2 . 
     The objects  100  can be supported on the machine conveyor  11  (e.g. provided with a machine endless belt  11   a ) only under the action of the gravity force. It is however possible that, such as in the embodiment shown in  FIG. 1 , the conveyor  11  is configured to generate a machine holding force MF that draws the objects  100  against the machine conveyor  11 . As an example, machine vacuum elements  13  may be provided. 
     The machine  10  is typically provided with devices  12  performing one or more operations on the objects  100 . In preferred embodiments, the machine  10  is providing with a cutting device  12 , that is used to obtain the objects  100  from a continuous layer  150  of material. 
     In particular, the cutting device  12  is typically movable in two different direction, so as to follow a closed path (i.e. it is movable along the perimeter of a bi-dimensional closed shape). Preferably, the cutting device  12  is movable along a substantially horizontal plane. As a result, the cutting device can repetitively cut the perimeter of the objects  100  within the continuous layer  150 . The cutting device  12  is preferably a laser cutting device  12 , i.e. a cutting device using laser to carry out a cut into the continuous layer  100 . 
     After the cut (i.e. downstream the cut) the continuous layer  100  is thus divided into a plurality of objects  100 , that are surrounded by a waste layer  151 , i.e. the remaining part of the layer  150  that is outside the objects  100 , as e.g. schematically shown in the detail of  FIG. 1 . 
     A waste collecting device  14  can be placed downstream the cutting device  12 , to remove the waste layer  151  from the machine conveyor  11  (and thus also from the objects  100 ). As an example, the waste collecting device may comprise a bobbin around which the waste layer  151  is wound, not shown, or it can be collected in a container  151   a  as for example shown in  FIG. 4 . 
     It has to be noted that the waste collecting device  14 , can be arranged downstream the cutting device  12  and could provide the deviation of the waste layer  151  from above (as for example schematically shown in  FIG. 1 , or from below as for example shown in  FIG. 4 ), as a result, downstream the waste collecting device  14 , only the objects  100  continue to be moved towards the conveyor  2  of the handling and collecting apparatus  1 . More in detail, according to a possible embodiment, as for example shown in  FIG. 4 , the waste layer  151  is separated from the objects  100  at the end of the machine conveyor  11 , so that the waste layer  151  is transported below the collecting area  5  of the objects, such as for example below the conveyor  5   b  of the collecting area  5 , as for example shown in  FIG. 4 . 
     The handling apparatus  1  is preferably arranged so that, in plant view, the conveyor  2  and the machine conveyor  11  partially overlap. In other words, the handling apparatus  1  is preferably arranged so that there is at least one vertical plane P that, considering the operating condition, crosses both the conveyor  2  and the machine conveyor  11 . 
     During use, the handling apparatus  1  receives objects  100  from a source. 
     As mentioned, the source is preferably a machine conveyor  11  of a machine  10 . Different operations may be carried out on the objects  100  on the machine  10 . 
     In possible embodiments, such as the one shown in  FIGS. 1 and 4 , a continuous layer  150  of material is fed to the machine  10 , preferably the material is provided by a bobbin or reel (as for example shown in  FIG. 4 ). A cutting device  12  (only schematically shown in  FIG. 4 ) cuts the objects within the continuous layer  150 . The waste layer  151  is then removed from objects  100  and from the machine conveyor  11 , so that only the object  100  are moved forward on the machine conveyor  11 . 
     The objects  100  then reach the conveyor  2  of the handling apparatus  1 . 
     The holding force F keeps the objects  100  attached to the conveyor  2  while they are moved forward by the conveyor  2 . 
     Typically, the holding force F is also used to separate the objects from the source (e.g. from the machine conveyor  11 ). During such an operation, the objects continue their horizontal movement. It is however possible that the objects  100  are also raised, i.e. they are moved in an upward direction towards the conveyor  2 , typically by a minimum extent. 
     The conveyor  2  is placed on top the objects  100 , i.e. the objects  100  are drawn against the conveyor  2 , under the conveyor  2 . 
     The objects  100  are then moved along the conveyor  2 , until they reach a portion of the conveyor where the disengagement device is arranged to separate the objects  100  from the conveyor  2 , causing the objects  100  to fall from the conveyor  2 . 
     Typically, the disengagement device  4  comprise a movable element  4   a  that is alternatively moved between a first and a second position, so that in the second position the movable element cause the objects  100  to fall from the conveyor  2 . 
     Once the objects  100  fall from the conveyor  2 , they are collected, typically stacked one onto the other, in the collecting area  5 , e.g. in a container  5   a  (as for example in the embodiment of  FIG. 1 ) or on a further conveyor  5   b  (as for example shown in the embodiment of  FIG. 4 ).