Patent Publication Number: US-10780714-B2

Title: Mandrel for printing necked cans

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part application and claims priority to U.S. patent application Ser. No. 15/381,165, filed Dec. 16, 2016, entitled MANDREL FOR PRINTING NECKED CANS. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The disclosed concept relates generally to machinery and, more particularly, to can decorator machines for decorating cans used in the food and beverage packaging industries. The disclosed concept also relates to mandrels and mandrel assemblies structured to support necked cans. 
     Background Information 
     High speed continuous motion machines for decorating cans, commonly referred to as can decorator machines or simply can decorators, are generally well known. A typical can decorator is disclosed in commonly assigned U.S. Pat. No. 5,337,659. It is understood that during the decorating process, the cans are “can bodies,” i.e., shells having a substantially cylindrical body with one closed end and one open end or, in some instances, two open ends. The can decorator includes an in-feed conveyor, which receives cans from a can supply (not shown) and directs them to arcuate cradles or pockets along the periphery of spaced parallel rings secured to a pocket wheel. The pocket wheel is fixedly secured to a continuously rotating mandrel carrier wheel or turret. The turret, in turn, is keyed to a continuously rotating horizontal drive shaft. Radial/horizontal spindles or mandrels, each being rotatable about its own axis, are mounted to the mandrel carrier wheel adjacent its periphery. Downstream from the in-feed conveyor, each mandrel is in closely spaced axial alignment with an individual pocket and undecorated cans are transferred from the pockets to the mandrels. Suction applied through an axial passage of the mandrel draws the can to a final seated position on the mandrel. 
     While mounted on, and rotating with, the mandrels, the cans are decorated by inking stations such as, but not limited to, inking stations including blankets or digital print heads. That is, the inking station(s) applies ink in a selected pattern while mandrels rotate the cans. Thereafter, and while still mounted on the mandrels, the outside of each decorated can is coated with a protective film of varnish applied by engagement with the periphery of an application roll in an over-varnish unit or digital print heads. Cans with decorations and protective coatings thereon are then transferred from the can decorator for further processing. 
     Generally, the can bodies and the mandrels are substantially cylindrical. The can bodies have a cross-sectional area that is slightly larger than the mandrel. In this manner, the can fits over the mandrel with the suction applied to the closed end of the can. It is noted that the open end of the can generally does not engage the mandrel. Such mandrels, however, are not structured to decorate can bodies that have been “necked.” That is, a “necked” can has been formed so that the end of the can about the open end has a smaller cross-sectional area relative to most other portions of the can. In this configuration, a cylindrical mandrel sized to pass through the necked open end of the can has a smaller cross-sectional area relative to most other portions of the can. In this configuration, the can is likely to wobble on the mandrel during the decorating process. This is a problem. 
     SUMMARY OF THE INVENTION 
     The disclosed and claimed concept provides a mandrel wherein a portion of the mandrel body outer surface is conical; i.e., flared outwardly. In this configuration, the can is drawn against the conical portion of the mandrel body outer surface while a generally cylindrical portion of the mandrel body extends into the can. Further, the space between the cylindrical portion of the mandrel body and the can is pressurized so as to resist deformations in the can during the decorating process. In an exemplary embodiment, the mandrel includes an elongated mandrel body with an outer surface, a proximal, first end, a proximal medial portion, a distal medial portion, and a distal, second end and having an axis of rotation. The mandrel body outer surface includes an elongated conical portion; the mandrel body outer surface conical portion is disposed adjacently about the mandrel body first end. The disclosed and claimed mandrel configuration solves the problem stated above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A full understanding of the invention can be gained from the following description of the preferred embodiments when read in conjunction with the accompanying drawings in which: 
         FIG. 1  is a side view of a can decorator. 
         FIG. 2  is a cross-sectional side view of a mandrel assembly with a necked can thereon. 
         FIG. 3  is an alternate cross-sectional side view of a mandrel assembly with a necked can thereon and with a fluid system manifold. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     It will be appreciated that the specific elements illustrated in the figures herein and described in the following specification are simply exemplary embodiments of the disclosed concept, which are provided as non-limiting examples solely for the purpose of illustration. Therefore, specific dimensions, orientations, assembly, number of components used, embodiment configurations and other physical characteristics related to the embodiments disclosed herein are not to be considered limiting on the scope of the disclosed concept. 
     Directional phrases used herein, such as, for example, clockwise, counterclockwise, left, right, top, bottom, upwards, downwards and derivatives thereof, relate to the orientation of the elements shown in the drawings and are not limiting upon the claims unless expressly recited therein. 
     As used herein, the singular form of “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. 
     As used herein, “structured to [verb]” means that the identified element or assembly has a structure that is shaped, sized, disposed, coupled and/or configured to perform the identified verb. For example, a member that is “structured to move” is movably coupled to another element and includes elements that cause the member to move or the member is otherwise configured to move in response to other elements or assemblies. As such, as used herein, “structured to [verb]” recites structure and not function. Further, as used herein, “structured to [verb]” means that the identified element or assembly is intended to, and is designed to, perform the identified verb. Thus, an element that is merely capable of performing the identified verb but which is not intended to, and is not designed to, perform the identified verb is not “structured to [verb].” 
     As used herein, “associated” means that the elements are part of the same assembly and/or operate together, or, act upon/with each other in some manner. For example, an automobile has four tires and four hub caps. While all the elements are coupled as part of the automobile, it is understood that each hubcap is “associated” with a specific tire. 
     As used herein, the statement that two or more parts or components are “coupled” shall mean that the parts are joined or operate together either directly or indirectly, i.e., through one or more intermediate parts or components, so long as a link occurs. As used herein, “directly coupled” means that two elements are directly in contact with each other. As used herein, “fixedly coupled” or “fixed” means that two components are coupled so as to move as one while maintaining a constant orientation relative to each other. Accordingly, when two elements are coupled, all portions of those elements are coupled. A description, however, of a specific portion of a first element being coupled to a second element, e.g., an axle first end being coupled to a first wheel, means that the specific portion of the first element is disposed closer to the second element than the other portions thereof. Further, an object resting on another object held in place only by gravity is not “coupled” to the lower object unless the upper object is otherwise maintained substantially in place. That is, for example, a book on a table is not coupled thereto, but a book glued to a table is coupled thereto. 
     As used herein, a “fastener” is a separate component structured to couple two or more elements. Thus, for example, a bolt is a “fastener” but a tongue-and-groove coupling is not a “fastener.” That is, the tongue-and-groove elements are part of the elements being coupled and are not a separate component. 
     As used herein, the phrase “removably coupled” or “temporarily coupled” means that one component is coupled with another component in an essentially temporary manner. That is, the two components are coupled in such a way that the joining or separation of the components is easy and would not damage the components. For example, two components secured to each other with a limited number of readily accessible fasteners, i.e., fasteners that are not difficult to access, are “removably coupled” whereas two components that are welded together or joined by difficult to access fasteners are not “removably coupled.” A “difficult to access fastener” is one that requires the removal of one or more other components prior to accessing the fastener wherein the “other component” is not an access device such as, but not limited to, a door. 
     As used herein, “temporarily disposed” means that a first element(s) or assembly (ies) is resting on a second element(s) or assembly(ies) in a manner that allows the first element/assembly to be moved without having to decouple or otherwise manipulate the first element. For example, a book simply resting on a table, i.e., the book is not glued or fastened to the table, is “temporarily disposed” on the table. 
     As used herein, “operatively coupled” means that a number of elements or assemblies, each of which is movable between a first position and a second position, or a first configuration and a second configuration, are coupled so that as the first element moves from one position/configuration to the other, the second element moves between positions/configurations as well. It is noted that a first element may be “operatively coupled” to another without the opposite being true. 
     As used herein, a “coupling assembly” includes two or more couplings or coupling components. The components of a coupling or coupling assembly are generally not part of the same element or other component. As such, the components of a “coupling assembly” may not be described at the same time in the following description. 
     As used herein, a “coupling” or “coupling component(s)” is one or more component(s) of a coupling assembly. That is, a coupling assembly includes at least two components that are structured to be coupled together. It is understood that the components of a coupling assembly are compatible with each other. For example, in a coupling assembly, if one coupling component is a snap socket, the other coupling component is a snap plug, or, if one coupling component is a bolt, then the other coupling component is a nut. 
     As used herein, “correspond” indicates that two structural components are sized and shaped to be similar to each other and may be coupled with a minimum amount of friction. Thus, an opening which “corresponds” to a member is sized slightly larger than the member so that the member may pass through the opening with a minimum amount of friction. This definition is modified if the two components are to fit “snugly” together. In that situation, the difference between the size of the components is even smaller whereby the amount of friction increases. If the element defining the opening and/or the component inserted into the opening are made from a deformable or compressible material, the opening may even be slightly smaller than the component being inserted into the opening. With regard to surfaces, shapes, and lines, two, or more, “corresponding” surfaces, shapes, or lines have generally the same size, shape, and contours. 
     As used herein, a “planar body” or “planar member” is a generally thin element including opposed, wide, generally parallel surfaces, i.e., the planar surfaces of the planar member, as well as a thinner edge surface extending between the wide parallel surfaces. That is, as used herein, it is inherent that a “planar” element has two opposed planar surfaces. The perimeter, and therefore the edge surface, may include generally straight portions, e.g., as on a rectangular planar member, or be curved, as on a disk, or have any other shape. 
     As used herein, a “path of travel” or “path,” when used in association with an element that moves, includes the space an element moves through when in motion. As such, any element that moves inherently has a “path of travel” or “path.” 
     As used herein, the statement that two or more parts or components “engage” one another shall mean that the elements exert a force or bias against one another either directly or through one or more intermediate elements or components. Further, as used herein with regard to moving parts, a moving part may “engage” another element during the motion from one position to another and/or may “engage” another element once in the described position. Thus, it is understood that the statements, “when element A moves to element A first position, element A engages element B,” and “when element A is in element A first position, element A engages element B” are equivalent statements and mean that element A either engages element B while moving to element A first position and/or element A either engages element B while in element A first position. 
     As used herein, “operatively engage” means “engage and move.” That is, “operatively engage” when used in relation to a first component that is structured to move a movable or rotatable second component means that the first component applies a force sufficient to cause the second component to move. For example, a screwdriver may be placed into contact with a screw. When no force is applied to the screwdriver, the screwdriver is merely “coupled” to the screw. If an axial force is applied to the screwdriver, the screwdriver is pressed against the screw and “engages” the screw. However, when a rotational force is applied to the screwdriver, the screwdriver “operatively engages” the screw and causes the screw to rotate. Further, with electronic components, “operatively engage” means that one component controls another component by a control signal or current. 
     As used herein, the word “unitary” means a component that is created as a single piece or unit. That is, a component that includes pieces that are created separately and then coupled together as a unit is not a “unitary” component or body. 
     As used herein, the term “number” shall mean one or an integer greater than one (i.e., a plurality). 
     As used herein, in the phrase “[x] moves between its first position and second position,” or, “[y] is structured to move [x] between its first position and second position,” “[x]” is the name of an element or assembly. Further, when [x] is an element or assembly that moves between a number of positions, the pronoun “its” means “[x],” i.e., the named element or assembly that precedes the pronoun “its.” 
     As used herein, “about” in a phrase such as “disposed about [an element, point or axis]” or “extend about [an element, point or axis]” or “[X] degrees about an [an element, point or axis],” means encircle, extend around, or measured around. When used in reference to a measurement or in a similar manner, “about” means “approximately,” i.e., in an approximate range relevant to the measurement as would be understood by one of ordinary skill in the art. 
     As used herein, a “radial side/surface” for a circular or cylindrical body is a side/surface that extends about, or encircles, the center thereof or a height line passing through the center thereof. As used herein, an “axial side/surface” for a circular or cylindrical body is a side that extends in a plane extending generally perpendicular to a height line passing through the center. That is, generally, for a cylindrical soup can, the “radial side/surface” is the generally circular sidewall and the “axial side(s)/surface(s)” are the top and bottom of the soup can. 
     As employed herein, the terms “can” and “container” are used substantially interchangeably to refer to any known or suitable container, which is structured to contain a substance (e.g., without limitation, liquid; food; any other suitable substance), and expressly includes, but is not limited to, beverage cans, such as beer and soda cans, as well as food cans. As used herein, a “necked can” is a can including a sidewall and one open end wherein the open end has a cross-sectional area that is less than the cross-sectional area of the other portions of the sidewall. It is noted that a can wherein a closed end of the can has a cross-sectional area that is less than the cross-sectional area of the other portions of the sidewall is not determinative of whether the can is a “necked can.” That is, the cross-sectional area of a closed can end is not relevant to that nature of a can as a “necked can.” 
     As used herein, “generally curvilinear” includes elements having multiple curved portions, combinations of curved portions and planar portions, and a plurality of planar portions or segments disposed at angles relative to each other thereby forming a curve. 
     As used herein, a “contour” means the line or surface that defines an object. That is, for example, when viewed in cross-section, the surface of a three-dimensional object is reduced to two-dimensions; thus, a portion of a three-dimensional surface contour is represented by a two-dimensional line “contour.” 
     As used herein, a “perimeter portion” means the area at the outer edge of a defined area, surface, or contour. 
     As used herein, “generally” means “in a general manner” relevant to the term being modified as would be understood by one of ordinary skill in the art. 
     As used herein, “substantially” means “for the most part” relevant to the term being modified as would be understood by one of ordinary skill in the art. 
     As used herein, “at” means on and near relevant to the term being modified as would be understood by one of ordinary skill in the art. 
     An exemplary can decorator  10  for a can  1  is shown in  FIG. 1 . It is understood that can decorators which use mandrels may be in other configurations such as, but not limited to, the can decorator disclosed in U.S. Pat. No. 9,327,493. Further, as described below, the can  1  is assumed to be substantially circular. It is understood, however, that the can  1  and elements that interact with the can  1 , may have a shape other than substantially circular. Further, the can  1  is a “necked” can  1  as described above; that is, the can  1  has a sidewall  2  with a first cross-sectional area, a necked opening  3  with a smaller, second cross-sectional area, and a closed end  4  which, in an exemplary embodiment, is domed. 
     The can decorator  10  includes a can infeed  12 , a mandrel turret  14 , a plurality of ink stations  16 , a blanket wheel  18  having a plurality of blankets  20  disposed about the outer circumference, and a can transfer assembly  22 . Generally, the configuration of the mandrel turret  14  is not relevant to the present concept, but it is noted that the mandrel turret  14  includes a drive assembly structured to rotate each mandrel assembly  50  and/or mandrel  80 , discussed below. 
     Generally, each mandrel assembly  50  includes a mandrel shaft body  62  and a mandrel  80  disposed thereabout. The mandrel shaft body  62  and mandrel  80  are discussed in detail below. A number, or a plurality, of mandrel assemblies  50  are coupled to the mandrel turret  14 . The mandrel assemblies  50  are generally elongated and coupled at one end to the mandrel turret  14 . In the embodiment shown, each mandrel assembly  50 , and more specifically each mandrel shaft body  62  extends substantially parallel to the mandrel turret  14  axis of rotation  34 . It is noted that in other embodiment, such as the embodiment shown in U.S. Pat. No. 9,327,493, each mandrel assembly  50  extends generally radially relative to the mandrel turret  14  axis of rotation  34 . In the embodiment shown, the blanket wheel  18  is also structured to rotate on an axis  19  that extends substantially parallel to the mandrel turret axis of rotation  34 . The blankets  20  are disposed on the outer surface of the blanket wheel  18 . Thus, the blankets  20  are positioned to laterally, or radially, engage the mandrel assemblies  50 . As is known, each ink station  16  applies an ink to the blankets  20 , typically via an intermediate plate cylinder  36 . The ink stations  16  are disposed, generally, on the side of the blanket wheel axis of rotation  19  opposite the mandrel carrier  30 . A prespin assembly  38  (shown schematically) which typically comprises a plurality of belts  40  and guide wheels  42  is operatively coupled to the blanket wheel  18  and has a belt  40  structured to engage a mandrel  80  (described below) and spin the mandrel  80 . 
     In operation, a can  1  is disposed over the distal end of a mandrel assembly  50  at the can infeed  12 . As the mandrel carrier  30  rotates, the mandrel assembly  50  with the can  1  is moved toward the blanket wheel  18 . Prior to engaging the blanket  20 , the prespin assembly belt  40  engages the mandrel  80  and causes the mandrel  80  to spin about the mandrel assembly longitudinal axis. As the mandrel carrier  30  continues to rotate, the mandrel assembly  50  with the can  1  is moved into engagement with an inked blanket  20 , while spinning at a speed such that the can  1  rotates once during the engagement with the blanket  20 . This causes the ink on the blanket  20  to be transferred to the can  1 . The can transfer assembly  22  then removes the can  1  from the mandrel assembly  50  and transfers the can  1  to subsequent processing stations such as, but not limited to, a varnishing station and/or curing station  24 . 
     As shown in  FIG. 3 , a mandrel assembly  50  includes an elongated mandrel shaft assembly  60 , a mandrel  80 , and a fluid system  150 . Alternatively, and as used herein, the fluid system  150  is also identified as part of each mandrel shaft assembly  60  and is discussed below. Further, as the mandrel assemblies  50  are substantially similar, only one mandrel assembly  50  is described herein. 
     Each mandrel shaft assembly  60  includes an elongated body  62 . Each mandrel shaft assembly body  62  (hereinafter, “mandrel shaft body”  62 ) includes an outer surface  64 , a proximal, first end  66 , and a distal, second end  68 . As used herein, an “end” of an elongated body means a length of the body at the identified “end” as opposed to just the axial face of the body. It is understood that the “proximal end” is the end coupled, or adjacent, to the mandrel turret  14 . The mandrel shaft body  62  also includes a medial portion (not numbered) which further includes a proximal medial portion and a distal medial portion (neither numbered). 
     In an exemplary embodiment, the mandrel shaft body  62  defines a central passage which is identified herein as a vacuum conduit  70 . The vacuum conduit  70  has a distal end  71  which, in an exemplary embodiment, is threaded. Further, the mandrel shaft body second end  68  includes a mounting  72 . As shown and in an exemplary embodiment, the mounting  72  is a toroidal collar  74  disposed about the vacuum conduit  70  and which has a smaller cross-sectional area than the mandrel shaft body  62 . 
     In one embodiment, the mandrel shaft body  62  is rotatably coupled to the mandrel turret  14 . In another embodiment, the mandrel  80 , described below, is rotatably disposed on the mandrel shaft body  62 . A drive assembly (not shown) is structured to, and does, rotate the mandrel  80  or the mandrel shaft body  62  about the longitudinal axis of the mandrel shaft body  62 . Thus, the mandrel assembly  50  has an axis of rotation  52  which is also the mandrel shaft body  62  axis of rotation or the mandrel  80  axis of rotation. 
     Each mandrel  80  includes a generally toroidal, elongated body  82 . Each mandrel body  82  includes an outer surface  84 , a proximal, first end  86 , proximal medial portion  88 , a distal medial portion  90 , a distal, second end  92  and defines a generally enclosed space  94 . Further, as discussed below, the mandrel body  82  rotate and, therefore, has an axis of rotation  96 . It is noted that the mandrel body axis of rotation  96  is substantially aligned with the longitudinal axis of the elongated mandrel body  82 . It is understood that the mandrel body proximal medial portion  88  and mandrel body distal medial portion  90  are disposed between the mandrel body first end  86  and the mandrel body second end  92  with a mandrel body midline separating the mandrel body proximal medial portion  88  and mandrel body distal medial portion  90 . It is understood that the “proximal end” is the end coupled, or adjacent, to the mandrel turret  14 . The mandrel body  82  is a generally toroidal body having both ends open. That is, generally, the mandrel body  82  is generally hollow and defines a passage. The mandrel body  82 , in an exemplary embodiment, includes an inwardly extending, toroidal mounting flange  83 . The mandrel body mounting flange  83  is structured to correspond to the mandrel shaft body mounting  72 . That is, the opening defined by the mandrel body mounting flange  83  corresponds to the mandrel shaft body mounting  72 . 
     The mandrel body outer surface  84  includes an elongated conical portion  100  and an elongated generally cylindrical portion  102 . As used herein, a surface with an “elongated conical portion” means a generally conical surface that has length that is more than a transition between tiers. That is, for example, U.S. Pat. No. 6,167,805  FIGS. 2 and 12  disclose tiered, tapered shafts with short conical portions between the tiers; such short conical transition portions are not, as used herein, an “elongated conical portion.” In an exemplary embodiment, the mandrel body outer surface conical portion  100  is flared. As used herein, a “flared” conical portion of an elongated body having a cylindrical portion means that the wide end of the “flared” conical portion has a greater cross-sectional area than the cylindrical portion of the elongated body. In an exemplary embodiment, the mandrel body outer surface conical portion  100  is disposed adjacently about at least one of the mandrel body first end  86  and the mandrel body proximal medial portion  88 . As used herein, “adjacently about” means generally encircling and near. That is, it is understood that the length of the mandrel body outer surface conical portion  100  is sized relative to the necked can being formed and the mandrel body outer surface conical portion  100 ; in exemplary embodiments (not shown) is disposed adjacently about one of, or a combination of, the mandrel body proximal medial portion  88 , the mandrel body distal medial portion  90  and the mandrel body distal, second end  92 . The mandrel body outer surface conical portion  100  defines a necked engagement surface  110  as well as a mandrel body necked engagement surface  110 ′. As used herein, a “necked engagement surface” is a surface that is structured to be, and is, engaged by the surface of a necked can  1 . That is, a surface that is structured to be, and is, engaged by the surface of a non-necked can, or a surface that is only capable of, but is not, engaged by the surface of a necked can, is not a “necked engagement surface” as used herein. As used herein, a “mandrel body necked engagement surface” means a surface of a mandrel body that is structured to be, and is, engaged by the inner surface about the opening of a necked can  1 . Thus, a “mandrel body necked engagement surface” means a surface that is coupled to the inner surface about the opening of a necked can  1 . That is, a surface of a mandrel body that is structured to be, and is, engaged by the surface of a non-necked can, or a surface that is only capable of, but is not, engaged by the surface of a necked can, is not a “mandrel body necked engagement surface” as used herein. Thus, as used herein, a structure such as, but not limited to, a tapered mandrel body that is structured to, or does, engage more than the opening of a tapered work piece such as, but not limited to, a tapered cup is not, as used herein, a “mandrel body necked engagement surface.” 
     Further, in the exemplary embodiment shown, the mandrel body outer surface cylindrical portion  102  is disposed adjacently about the mandrel body distal medial portion  90  and the mandrel body second end  92 . The mandrel body outer surface cylindrical portion  102  has a cross-sectional area that is smaller than the cross-sectional area of the can necked opening  3  and the can sidewall  2 . The mandrel body outer surface cylindrical portion  102  defines a non-engagement surface  112 . As used herein, a “non-engagement surface” means a surface that is structured so that a can  1  does not engage the surface. For example, as shown, a surface having a cross-sectional area that is substantially smaller than the cross-sectional area of the can sidewall  2  is a “non-engagement surface.” It is noted that as prior art cans are disposed over prior art mandrels, the mandrels must have a cross-sectional area that is smaller than the mandrel. The sidewalls of such prior art cans extend substantially parallel to the surface of the mandrels. Such prior art cans, however, have a cross-sectional area that is substantially similar, but slightly larger, than the prior art mandrels. Such prior art mandrels do not have, as used herein, a cross-sectional area that is “substantially smaller” than the prior art cans. 
     Each mandrel body  82  is disposed over and coupled, directly coupled, or rotatably coupled to an associated mandrel shaft body  62 . Stated alternately, each mandrel shaft body  62  is partially disposed in an associated mandrel body enclosed space  94 . Thus, each mandrel body  82  is structured to, and does, rotate about the mandrel assembly axis of rotation  52 . As shown, the mandrel assembly  50  also includes a mandrel retainer  56  which is a toroidal body including a wide portion and a narrow portion (neither numbered.) The mandrel retainer  56  narrow portion is threaded and sized to correspond to the threaded vacuum conduit distal end  71 . Thus, in an exemplary embodiment, the mandrel body  82  is disposed over the mandrel shaft body  62  with the mandrel body mounting flange  83  disposed on the mandrel shaft body mounting  72 . The mandrel retainer  56  is then threadably coupled to the threaded vacuum conduit distal end  71 . In this configuration, the mandrel body  82  is fixed to the mandrel shaft body  62 . It is understood that in this configuration, the mandrel shaft body  62  rotates relative to the mandrel turret  14 . Further, it is noted that the vacuum conduit  70  is in fluid communication with the passage defined by the mandrel retainer  56 . 
     Further, in an exemplary embodiment, the mandrel body  82  defines a number of pressure conduits  120 . Each pressure conduit  120  includes an inlet  122  and an outlet  124 . In an exemplary embodiment, each pressure conduit inlet  122  is disposed at the mandrel body first end  86  and each pressure conduit outlet  124  is disposed adjacent the mandrel body outer surface non-engagement surface  112 . 
     In an exemplary embodiment, the mandrel assembly  50 , or as noted above, each mandrel shaft assembly  60 , includes a fluid system  150 , shown schematically. The fluid system  150  includes a control assembly  152 , a negative pressure generator  154 , a positive pressure generator  156 , a number of vacuum conduits  158 , a number of vacuum couplings  160 , and a number of pressure conduits  162 . In an exemplary embodiment, the fluid system  150  also includes a number of manifolds  164 . The negative pressure generator  154  is structured to, and does, generate a negative pressure in a fluid relative to the atmospheric pressure and which, as used herein, is identified as a “vacuum.” The positive pressure generator  156  is structured to, and does, generate a positive pressure in a fluid relative to the atmospheric pressure. The control assembly  152  is structured to, and does, actuate the fluid system negative pressure generator  154  and the fluid system positive pressure generator  156  in an overlapping manner. As used herein, an “overlapping manner” means that both the fluid system negative pressure generator  154  and the fluid system positive pressure generator  156  are generating a pressure at the same time and for more than a small instant. In an exemplary embodiment, the fluid system negative pressure generator  154  is actuated before the fluid system positive pressure generator  156 . Thus, the can  2  is held by a vacuum to the mandrel assembly  50  before the can is inflated. Further, the fuel system positive pressure generator  156  is, in an exemplary embodiment, maintained in an actuated state for longer than the fluid system negative pressure generator  154  so that the can  2  is ejected from the mandrel assembly  50 . 
     In an exemplary embodiment, the fluid system negative pressure generator  154  and the fluid system positive pressure generator  156  both generate a pressure for about the time a can  1  is disposed on the mandrel assembly  50 . 
     Each fluid system vacuum conduit  158  is in fluid communication with the fluid system negative pressure generator  154  and with the mandrel shaft body vacuum conduit  70 . As such, each mandrel shaft body vacuum conduit  70  is, as used herein, part of a fluid system vacuum conduit  158 . Each fluid system vacuum coupling  160  is in fluid communication with a mandrel shaft body vacuum conduit  70 . That is, each fluid system vacuum coupling  160  is disposed within an associated mandrel body second end  92 . Further, each fluid system vacuum coupling  160  is structured to be coupled to a can  1 . That is, in an exemplary embodiment, each fluid system vacuum coupling  160  includes a resilient, partially conical body, such as, but not limited to a suction cup  161 . Each fluid system vacuum coupling  160  is structured to engage a can end  4  when the can is disposed on a mandrel  80  and when a negative pressure is drawn via the fluid system negative pressure generator  154 . Thus, the fluid system  150  is structured to bias a can against the mandrel  80 . Stated alternately, the fluid system  150  is structured to bias a can necked opening  3  against the necked engagement surface  110 . 
     As shown in  FIG. 3 , a fluid system manifold  164  is disposed about each mandrel body first end  86 . Each fluid system manifold  164  is structured to be, and is, in fluid communication with the positive pressure generator  156 . Each fluid system manifold  164  is further structured to be, and is, in fluid communication with each mandrel body pressure conduit  120 . Thus, each mandrel body pressure conduit  120  is, as used herein, also part of a fluid system pressure conduits  162 . In this configuration, the fluid system  150  is structured to provide fluid at a positive pressure to each pressure conduit outlet  124 . 
     Thus, in operation, a can  1  is disposed on a mandrel  80  as described above. It is further noted that, in the configuration disclosed above, when the can  1  is disposed on a mandrel  80  there is a space, or plenum  180 , between the mandrel body outer surface cylindrical portion  102  (as well as some portions of the mandrel body outer surface conical portion  100 ) and the inner surface of the can  1 . Further, each pressure conduit outlet  124  is in fluid communication with the plenum  180 . 
     In an exemplary embodiment, the fluid system negative pressure generator  154  and the fluid system positive pressure generator  156  are actuated in an overlapping manner, with the fluid system negative pressure generator  154  actuated before the fluid system positive pressure generator  156 . Further, the fluid system negative pressure generator  154  generates a greater bias on the can  1  than the fluid system positive pressure generator  156 . In this configuration, the fluid system negative pressure generator  154  draws the can  1  against the mandrel  80  as described above, then the fluid system positive pressure generator  156  applies a positive pressure to the plenum  180 . As used herein, a can  1  having a positive pressure applied to the can sidewall  2  is “inflated.” Thus, the fluid system positive pressure generator  156  is structured to inflate the can  1 . The can  1  is both drawn against the mandrel  80  and inflated during the printing process. After the printing process, the fluid system negative pressure generator  154  and the fluid system positive pressure generator  156  are disengaged. The fluid system positive pressure generator  156  is, in an exemplary embodiment, re-actuated, or maintained in an actuated state longer then the fluid system negative pressure generator  154 , so as to eject the can  1  from the mandrel  80 . 
     While specific embodiments of the invention have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of invention which is to be given the full breadth of the claims appended and any and all equivalents thereof.