fig1 shows a first embodiment of a machine ( 1 ) for preparing beverages of the type according to the present invention , including an extraction device ( 3 ) adapted for processing single dose packages ( 2 ). in particular , fig1 represents an embodiment of a machine ( 1 ) that presents an opening disposition ( 5 ) and an actuation device ( 6 ) provided as separate elements and disposed successively upstream and in the supply path to an extraction device ( 3 ) adapted for extraction of single dose packages ( 2 ). moreover , both the opening disposition ( 5 ) and the actuation device ( 6 ) are provided as elements that can be actuated in rotation around a respective horizontal axis . as one can observe in fig2 , said single dose packages ( 2 ) are in this case configured as flexible pods provided in support ( 21 ) of single portions configured in form of strip or similar , and comprising a plurality of single dose portions ( 22 ) presenting at least two package walls ( 23 , 24 ) substantially hermetic to air . in particular , the plurality of single dose portions ( 22 ) is provided without passageways ( 25 ) in any of its package walls ( 23 , 24 ). said support ( 21 ) of single portions ( see fig1 ) is housed inside of a support package ( 4 ) that engages in a part of the machine ( 1 ) so that said support ( 21 ) of single portions can be displaced out of said support package ( 4 ) by means of an actuation device ( 6 ) so as to successively supply said single dose portions ( 22 ) to said extraction device ( 3 ). as one can better observe in detail p 01 , said actuation device ( 6 ) is provided as a rotation element , for example of pulley type , rotatable around a horizontal axis , and actuated so as to rotate said support ( 21 ) of single portions step - by - step and downwards , until a single dose portion ( 22 ) furthest downstream is physically separated and supplied under the action of the gravity force to said extraction device ( 3 ). fig1 further represents on a merely illustrative manner , an opening disposition ( 5 ) indicated as a disposition separate from the remanding and disposed in the path of said support ( 21 ) of single portions and upstream of said extraction device ( 3 ). according to a first inventive aspect , said opening disposition ( 5 ) is provided so that it can actuated in rotation around a substantially horizontal or vertical axis , as it shall explained in greater detail in two embodiments further below . fig3 represents a first embodiment of said opening disposition ( 5 ), represented schematically and disposed upstream of said extraction device ( 3 )— only partially represented and indicative of the relative position . in this case , it is a front view of the machine ( 1 ) for preparing beverages so that the axis of rotation of said opening disposition ( 5 ) develops along the depth direction of the machine ( 1 ). as one can observe , the opening disposition ( 5 ) is in this case provided — and adapted so as to provide at least one , preferentially a plurality of passageways ( 25 ) in both package walls ( 23 , 24 ) of said single dose portions ( 22 ). in particular , the opening disposition ( 5 ) comprises two opening parts ( 51 , 52 ) provided as cylindrical elements with a side perimeter surface presenting a plurality of opening protrusions ( 53 ) and arranged in direct opposition at such a distance that the passage of a single dose portion ( 22 ) in between shall produce said passageways ( 25 ). fig4 shows top views of the opening parts vistas ( 51 , 52 ) of an opening disposition ( 5 ) according to fig3 , so that one can observe in particular the distribution and form of respective opening protrusions ( 53 ). in the case of this embodiment both opening parts ( 51 , 52 ) present opening surfaces ( 54 ) each comprising a plurality of opening protrusions ( 53 ) distributed in a pattern on the opening surface ( 54 ) and disposed so as to interact with a respectively opposing package wall ( 23 , 24 ) of said package ( 2 ), or single dose portion ( 22 ), so that there results a respective passageway ( 25 ). according to a preferred embodiment , said opening protrusions ( 53 ) are disposed so as to interact with at least most part of at least one respective package wall ( 23 , 24 ) of said package ( 2 ), or single dose portion ( 22 ). moreover , the respective opening surfaces ( 54 ) present a characteristic dimension , in particular a width that corresponds at least to a respective characteristic dimension , in particular a width , of said packages ( 2 ). as illustrated , the opening protrusions ( 53 ) can be configured different , including with a different format and / or relative dimension , because the flow characteristics on the entry - side of the package ( 2 ), or single dose portion ( 22 ), that is on a first package wall ( 23 ), can be required to be different from the flow characteristics on the exit - side , that is on a second package wall ( 24 ). in particular , some of the opening protrusions ( 53 )— for example as those represented on a first opening part ( 51 )— can be provided so as to perforate at least one of the package walls ( 23 , 24 ), eventually one relating to the flow entry - side , whereas other opening protrusions ( 53 )— for example as those represented on a second opening part ( 52 )— can be provided so as to provoke the rupture and / or weakening of material zones previously provided on a package wall ( 23 , 24 ), eventually in one relating to the flow exit - side . fig5 shows a second embodiment of a machine ( 1 ) for preparing beverages according to the present invention , that presents an opening disposition ( 5 ) provided integrated on the actuation device ( 6 ) disposed upstream of said extraction device ( 3 )— only partially represented and as mere indication of its relative position . in this case , it is a side view of part of a machine ( 1 ) for preparing beverages so that the axis of rotation of said actuation device ( 6 ) develops transversally relative to the depth direction of the machine ( 1 ). as one can observe , said actuation device ( 6 ) is provided with an opening surface ( 54 ) on the exterior perimeter surface that operates as traction element of a strip - like support ( 21 ) of single portions , thereby displacing successive single dose portions ( 22 ) from a substantially horizontal direction upstream of the actuation device ( 6 ) to a substantially vertical direction downstream , before each single dose portion ( 22 ) falls under the action of the gravity force inside of a respective extraction device ( 3 ). said opening surface ( 54 ) presents a plurality of opening protrusions ( 53 ) adapted so as to interact with a first package wall ( 23 ) of the successive single dose portions ( 22 ) as the latter are displaced along part of the periphery of said actuation device ( 6 ). as it shall be readily understood by an expert in the field , said interaction between the opening protrusions ( 53 ) and a respective first package wall ( 23 ) contributes to improve the traction effect , that is the movement transmission by said actuation device ( 6 ), thereby enhancing the operation reliability of the machine ( 1 ) for preparing beverages . moreover , according to a preferred embodiment , it is further provided a back - pressure element ( 62 ) disposed so as to exert a back - pressure upon a second package wall ( 24 ) on the opposite side and as said single dose portion ( 22 ) is displaced through the space in - between relative to the actuation device ( 6 ), so as to reinforce the interaction of the opening protrusions ( 53 ) with said first package wall ( 23 ). according to a preferred embodiment , said actuation device ( 6 ) further comprises a second actuation part ( 62 ) provided at a distance and developing along part of the exterior perimeter of said first actuation part ( 61 ), thereby defining a space in - between both from which there results a back - pressure upon said packages ( 2 ) of the support ( 21 ) of single portions . as one can observe , said first actuation part ( 61 ) said actuation device ( 6 ) is provided with at least one actuation surface ( 63 ) that presents a plurality of opening protrusions ( 53 ) adapted for traction of a support ( 21 ) of single portions and for interaction with a respective package wall ( 23 ) so as to provide a plurality of passageways ( 25 ) thereupon . fig6 shows a third embodiment of a machine ( 1 ) for preparing beverages according to the present invention , that presents an opening disposition ( 5 ) provided integrated in said actuation device ( 6 ) disposed upstream of said extraction device ( 3 ), in a view similar to that of fig5 . as one can observe , said actuation device ( 6 ) presents a first actuation part ( 61 ) provided in form of circular drum so that it is actuated in rotation around a substantially horizontal axis and so that it comprises said opening disposition ( 5 ), in particular a plurality of opening protrusions ( 53 ) provided on a respective perimeter surface . as one can observe , said actuation device ( 6 ) in this case presents a plurality of collection zones ( 64 ) along its perimeter , provided as recesses relative to the actuation surface ( 63 ) and configured so as to engage in surface with the single dose portion ( 22 ) of said support ( 21 ) of single doses . in particular , said collection zones ( 64 ) comprise respective opening surfaces ( 54 ) that present a plurality of opening protrusions ( 53 ) adapted for traction of a support ( 21 ) of single portions and for interaction with a respective package wall ( 23 ) so as to provide a plurality of passageways ( 25 ) thereon . according to another preferred embodiment ( not represented ), said opening protrusions ( 54 ) are provided so that they can be displaced in a translation movement forward and backward , relative to a respective collection zone ( 64 ). in particular , such actuation disposition of the opening protrusions ( 54 ) can be carried out by means of rotation element of eccentric cross section and associated with said opening protrusions ( 54 ). said eccentric element is provided in the opening disposition ( 5 ) so as to actuate the opening protrusions ( 54 ), by means of its eccentric section part , in a generally outwards direction when a single dose portion ( 22 ) is collected in a respective collection zone ( 64 ), and by continuing the rotation movement , stopping their actuation with said eccentric section part , so that said opening protrusions ( 54 ) are withdrawn back relative to the surface of the collection zones ( 64 ). fig7 shows top views of said first actuation part ( 61 ) presenting an opening disposition ( 5 ) according to fig6 , so that there can be observed in particular the distribution and form of respective opening protrusions ( 53 ) ( on the left ) and a respective engagement with single dose portions ( 22 ) provided in a support ( 21 ) of single portions ( on the right ). as referred above , said actuation device ( 6 ) is provided with at least one actuation surface ( 63 ) along its perimeter that presents at least one collection zone ( 64 ) configured so as engage in surface with the single dose portion ( 22 ) of said support ( 21 ) of single portions . according to another preferred embodiment , the step of rotation of the actuation device ( 6 ) in each operation cycle , is carried out in a rotation extension that corresponds to the advance of successive single dose portions ( 22 ) by one position .