Patent Grant
10239109
Field of the Invention
The disclosed and claimed concept relates to an alignment assembly for a forming machine and, more specifically to an alignment assembly that repositions a shell from an initial alignment position to an intermediate alignment position between an upper tooling assembly and a lower tooling assembly.
Background Information
Metallic containers (e.g., cans) for holding products such as, for example, liquids, beverages, or food products, are typically provided with an easy open can end on which an opening mechanism, such as a pull tab, is attached (e.g., without limitation, riveted) to a tear strip or severable panel. Typically, the tear strip is defined by a scoreline in the exterior surface (e.g., public side) of the can end. The pull tab is structured to be lifted, pulled, and/or rotated to sever the scoreline and deflect the tear strip, thereby creating an opening for dispensing the contents of the can.
When the can end is made, it originates as a can end shell, which is formed from a sheet metal product (e.g., without limitation, sheet aluminum; sheet steel). The shell is then conveyed to a conversion press, which has a number of successive tool stations. As the shell advances from one tool station to the next, conversion operations such as, for example and without limitation, rivet forming, paneling, scoring, embossing, tab securing and tab staking, are performed until the shell is fully converted into the desired can end and is discharged from the press. Typically, each tool station of the conversion press includes an upper tool member, which is structured to be advanced towards a lower tool member upon actuation of a press ram. The shell is received between the upper and lower tool members. Thus, as the upper tool member engages the shell, the upper and/or lower tool members respectively act upon the public (e.g., exterior side) and/or product (e.g., interior side, which faces the can body) sides of the shell, in order to perform a number of the aforementioned conversion operations. Upon completion of a given operation, the press ram retracts the upper tool member and the partially converted shell is moved to the next successive tool station, or the tooling assembly is changed within the same station, to perform the next conversion operation.
More specifically, a press assembly includes an operating mechanism, a transfer belt, and a tooling assembly. The tooling assembly includes an upper tooling assembly and a lower tooling assembly. In an exemplary embodiment, at each station the upper tooling assembly includes a forming construct such as, but not limited to, a punch. Similarly, at each station the lower tooling assembly includes a cooperative forming construct such as, but not limited to, a die. The shells are moved intermittently, or as used herein, “indexed,” through the tooling assembly thereby stopping at each station. That is, the operating mechanism is structured to operatively engage the transfer belt and the tooling assembly, essentially, alternately. Such an apparatus is disclosed in U.S. Pat. No. 4,903,521.
The transfer belt is structured to index a number of shells through the tooling assembly. In an exemplary embodiment, the transfer belt includes a number of apertures into which a blank is deposited. As noted above, the upper tooling assembly and the lower tooling assembly are structured to move between a first position, wherein the upper tooling assembly and the lower tooling assembly are spaced, and a second position wherein the upper tooling assembly and the lower tooling assembly are disposed immediately adjacent each other. It is common for one tooling assembly to be stationary and for the other tooling assembly to move. In an exemplary embodiment, and as used herein, the upper tooling assembly is described as the tooling assembly that moves while the lower tooling assembly is described as the stationary tooling assembly. When the upper tooling assembly and the lower tooling assembly are not in the second position, the operating mechanism operatively engages the transfer belt to move each shell to the next station. The transfer belt positions each shell in an initial alignment position at a station between the upper tooling assembly and the lower tooling assembly. When the shells are in the initial alignment position at a station between the upper tooling assembly and the lower tooling assembly, the operating mechanism operatively engages the upper tooling assembly and moves the upper tooling assembly to the second position. During this operation, the forming operations as described above occur.
Part of the forming operations may include moving the shell to a final alignment position. That is, a shell in the initial alignment position is often not properly aligned with the forming constructs of the station. Accordingly, the tooling assembly, and more specifically each station, may include a final alignment assembly that is structured to position the shell in the final alignment position. In an exemplary embodiment, a final alignment assembly includes an angled surface on the upper tooling assembly. As the upper tooling assembly moves toward the second position, the angled surface on the upper tooling assembly operatively engages the shell and moves the shell to the final alignment position. Once the shell is in the final alignment position, the forming constructs engage the shell and perform the forming operation(s) of the station.
Such press assemblies have a disadvantage in that a shell in the initial alignment position may be too misaligned to be placed in the final alignment position by known tooling assembly assemblies. By way of example, as the shell is converted from an initial generally planar shape to the final shape, the area of the shell may diminish. That is, a shell begins, in many instances, as a planar member. To accommodate the initial configuration of the shell, the apertures in the transfer belt must have a shape that corresponds to the shape of the planar shell. That is, the size and shape of the apertures in the transfer belt substantially correspond to the size and shape of the initial size and shape of the shell. Forming operations on the shell, such as, but not limited to, forming a curled perimeter on the shell, cause the size and the shape of the shell to change and often results in the shell having a smaller area. Moreover, the indexing, i.e., rapidly starting and stopping the transfer belt, cause a shell to move within the transfer belt apertures. That is, the shells may be displaced forwardly, rearwardly, laterally, or askew, i.e., angularly offset, in the transfer belt apertures.
There is, therefore, a need for an alignment assembly that repositions a shell from an initial alignment position to an intermediate alignment position between an upper tooling assembly and a lower tooling assembly. There is a further need for an alignment assembly that may be incorporated into existing press assemblies.
These needs, and others, are met by at least one embodiment of this invention which provides an alignment assembly for a press assembly including a number of alignment elements. The alignment elements include a number of moving alignment elements. The moving alignment elements are coupled to an upper tooling assembly that move between a first and second position. As the upper tooling assembly moves, the moving alignment elements move between a first position and a second position corresponding to the upper tooling assembly first position and a second position. The moving alignment elements are structured to move the shell from the initial alignment position to an intermediate alignment position. Thus, as the upper tooling assembly moves from the first position to the second position, the moving alignment elements contact a shell and move the shell from an initial alignment position to an intermediate alignment position.
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:
For purposes of illustration, embodiments of the disclosed concept will be described as applied to cans and/or can ends for food, although it will become apparent that they could also be used with other containers such as, for example and without limitation, cans for liquids such, but not limited to, beer and beverages. 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 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 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, food cans, as well as beverage cans, such as beer and soda cans.
As used herein, the singular form of “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise.
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” is one element of a coupling assembly. That is, a coupling assembly includes at least two components, or coupling components, that are structured to be coupled together. It is understood that the elements of a coupling assembly are compatible with each other. For example, in a coupling assembly, if one coupling element is a snap socket, the other coupling element is a snap plug. A “coupling” or “coupling component” includes a passage through which another element, such as but not limited to, a fastener passes.
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. It is noted that moving parts may be “directly coupled” when in one position, but may not be “directly coupled” when in another position. 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.
As used herein, the phrase “removably coupled” means that one component is coupled with another component in an essentially temporary and selectable 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 coupling assemblies 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 coupling assembly” is one that requires the removal of one or more other components prior to accessing the coupling assembly wherein the “other component” is not an access device such as, but not limited to, a door. By way of a further example, a clutch in an automobile is selectively coupled to the engine and the transmission, but is not a “removable coupling” in that the clutch is encased in a housing and cannot easily be accessed. Further, to be “removably coupled,” no coupling assemblies linking the two elements can be a “difficult to access coupling assembly.” That is, two elements coupled by many easy to access couplings and a single “difficult to access” fastener are not “removable coupled.”
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, the statement that two or more parts or components “engage” one another shall mean that the parts exert a force against one another either directly or through one or more intermediate parts or components.
As used herein, the word “unitary” means a component 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, “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.
As used herein, the term “number” shall mean one or an integer greater than one (i.e., a plurality).
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, “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, “progressively advance” or “index” means that a feeder device, conveyor, or other construct used to move work pieces moves a work piece forward a predetermined distance during each cycle of a press. That is, during an “indexing” motion, the conveyor is in motion for a time and is stationary for a time. Stated alternately, during an “indexing” motion there is a motion state and a stationary state of the conveyor.
As used herein, a “path of travel” of an element includes the space an element moves through when in motion. Thus, as used herein, any element that moves inherently has a path of travel.
As used herein, “translate” means to move relative to another element while maintaining the same orientation relative to a distant point.
As used herein, “shell” means a metal work piece that is being formed. The “shell” is formed by stations in the press assembly and, as such, it is understood that the “shell” changes size and shape until a final processing step at which the “shell” becomes a product. In an exemplary embodiment, the “shell” is a generally planar construct that is processed to become a “can end” upon a final processing step. This exemplary “shell” has various forming operations performed thereto that create, among other features, a curled edge that is used to couple the lid to a container body. It is understood, however, that a “shell” may be any type of metal work piece including containers and can bodies.
As used herein, “can end” refers to the lid or closure that is structured to be coupled to a can, in order to seal the can.
In an exemplary embodiment, and as shown in
The transfer belt 14 is a belt disposed in a conveyor configuration, i.e., a loop, and, as shown in
The operating mechanism 12 includes a number of drive assemblies (not shown) that are linked mechanically or electronically, or both, with one drive assembly operatively engaging the upper tooling assembly 18 and another drive assembly operatively engaging the transfer belt 14. The operating mechanism 12 is structured to move the upper tooling assembly between the first and second positions and to move the transfer belt 14 as described above. It is understood that the operating mechanism 12 provides a repetitive motion to the other elements. Each time the upper tooling assembly 18 reciprocates, the press assembly 10 completes one cycle. Further, as described above, during each cycle, the transfer belt 14 indexes forward but is not moving as the upper tooling assembly 18 moves into the second position. In this configuration, the press assembly 10 progressively forms a shell 1 into a can end 2.
While it is understood that a tooling assembly 16 includes multiple stations, the following description does not require details of the various stations. Accordingly, the following discussion relates to a single station including an upper cap 22 coupled to the upper tooling assembly 18, and, a die 24 coupled to the lower tooling assembly 20. As discussed above, the upper tooling assembly 18, and therefore the upper cap 22, are operatively engaged by the operating mechanism 12 and reciprocate between an upper, first position, wherein the upper cap 22 is spaced from the die 24, and a lower, second position, wherein the upper cap 22 is immediately adjacent the die 24. It is further understood that the station shown performs forming operations on a shell 1 that has been partially formed by prior stations so that the shape and size of the shell 1 is effectively reduced relative to the shape and size of the transfer belt aperture 30.
That is, it is understood that the size and shape of a shell 1 changes as the shell 1 is formed into a can end 2. Generally, the size and shape of a shell 1 becomes smaller as portions thereof are formed into shapes such as, but not limited to, an edge curl. That is, in an exemplary embodiment, the shell 1 is initially a substantially planar member that is fed on to the transfer belt 14 by a feeder device (not shown) or cut from a sheet of metal by a cutting station (not shown) while the sheet is disposed over the transfer belt 14. When the shell 1 is initially disposed in a transfer belt aperture 30, the size and shape of the shell 1 and the a transfer belt aperture 30 substantially correspond to each other. Thus, as the transfer belt 14 moves the shell 1 to the first station, the shell 1 is placed in a final alignment position by the transfer belt 14. That is, the transfer belt 14 is structured to move in a manner whereby the shell 1 is disposed in a desired location between the upper tooling assembly 18 and the lower tooling assembly 20. That is, as used herein, the “final alignment position” is the desired position for the shell 1 as forming operations occur within a station. The upper forming construct 21 of the upper tooling assembly 18, in the exemplary embodiment a upper cap 22, includes an angled surface 26. The upper tooling assembly angled surface 26 is disposed at a location so that, as the upper tooling assembly moves into the second position, the upper tooling assembly angled surface 26 operatively engages the shell 1 and moves the shell 1 from an intermediate alignment position (described below) to the final alignment position.
As the shell 1 is further formed, the shape and size of the shell 1 is effectively reduced relative to the shape and size of the transfer belt aperture 30 in which it is disposed. When the shell is in this configuration, movement of the transfer belt 14 causes the shell 1 to move within the transfer belt aperture 30. That is, the shell 1 may be displaced, relative to the final alignment position, forwardly, rearwardly, laterally, or askew, i.e., angularly offset, in the transfer belt aperture 30. As used herein, and when the shell 1 has a reduced shape and size relative to the associated transfer belt aperture 30, the position of a shell 1 following movement of the transfer belt 14 is the “initial alignment position.” That is, the “initial alignment position” is not the desired position for the shell as forming operations occur within a station. Further, as used herein, the “initial alignment position” is a position wherein the shell 1 is offset, or otherwise misaligned with the tooling assembly 16 so that an upper tooling angled surface 26 (discussed below and which is an alignment surface) cannot position the shell 1 in the final alignment position. Accordingly, the transfer belt 14 stops moving, i.e., the transfer belt 14 is in the stationary state of the indexing motion, and positions the shells 1 in an initial alignment position.
As shown in
The alignment assembly 60, in an exemplary embodiment, includes elements on the transfer belt 14, the upper tooling 18 and the lower tooling 20. As shown, the alignment assembly 60 includes number of alignment elements 62. In this exemplary embodiment, the number of alignment elements 62 include a number of moving alignment elements 70, a number of alignment recesses 90, and a number of alignment cavities 110. As used herein, an “alignment element” is a construct that moves a shell 1 from an initial alignment position to an intermediate alignment position, or, elements that are structured to assist or allow other elements to move a shell 1 from an initial alignment position to an intermediate alignment position. That is, as used herein, a recess on a belt aperture 30 that serves a purpose other than allowing a moving alignment element to pass is not an “alignment recess.” Similarly, moving element and an associated cavity, for example a rod on a moving die 24 and a cavity on a stationary die, that are structured to align the dies, but that do not directly move a shell 1, i.e., wherein the rods do not directly contact the shell, from an initial alignment position to an intermediate alignment position, are not “alignment elements,” as used herein.
As shown in
Each moving alignment element body second end 76, in an exemplary embodiment, includes an angled surface 80, as shown in
That is, in an exemplary embodiment, the number of moving alignment elements 70 includes a plurality of moving alignment elements 70. As shown in
In an exemplary embodiment, the plurality of moving alignment elements 70 includes a first moving alignment element 70A, a second moving alignment element 70B, a third moving alignment element 70C, a fourth moving alignment element 70D, a fifth moving alignment element 70E, and a sixth moving alignment element 70F. For descriptive purposes, and as used herein, the number of alignment elements 62, such as the number of moving alignment elements 70 described in this paragraph, are described in relation to a shell 1 as if the shell 1 were at the station of the tooling assembly 16 including the alignment assembly 60; it is understood that such a description is for reference only and that a shell 1 does not have to be in the press assembly 10 for the number of alignment elements 62 to be in the identified locations. The first moving alignment element 70A and the second moving alignment element 70B are disposed generally opposite each other and on opposite sides of the shell first axis 8. As shown, and as used herein, “generally opposite” does not require the elements to be directly opposite and the elements may be slightly offset from each other. Further, the third moving alignment element 70C and the fourth moving alignment element 70D are disposed generally opposite each other and on opposite sides of the shell second axis 9. Further, the fifth moving alignment element 70E and the sixth moving alignment element 70F are also disposed generally opposite each other and on opposite sides of the shell second axis 9. Moreover, the third moving alignment element 70C and the fifth moving alignment element 70E are disposed in an anti-twist configuration. Similarly, the fourth moving alignment element 70D and the sixth moving alignment element 70F are disposed in an anti-twist configuration. As used herein, an “anti-twist configuration” means that alignment elements are disposed on the same general side of a shell having a generally straight edge and which are spaced at least 0.5 inch apart.
In this configuration, and when a shell 1 is between the forming constructs having the alignment assembly 60, the moving alignment elements 70 are disposed on all sides of the generally rectangular shell of the present exemplary embodiment. Thus, as discussed above, when a shell 1 is in the initial alignment position, at least one moving alignment element body second end angled surface 80 is disposed directly above the perimeter of the shell 1.
The alignment recesses 90 are recesses disposed about the perimeter of each transfer belt aperture 30. As used herein, the alignment recesses 90 are not part of the perimeter of each transfer belt aperture 30; that is, the perimeter of each transfer belt aperture 30 is a substantially regular shape, e.g., circle, square, rectangle, obround, rounded square or rounded rectangle, and does not include the alignment recesses 90. Each alignment recess 90 is disposed in the path of an associated moving alignment element 70. Thus, in the exemplary embodiment described herein, there are a first alignment recess 90A, a second alignment recess 90B, a third alignment recess 90C, a fourth alignment recess 90D, a fifth alignment recess 90E, and a sixth alignment recess 90F. Each alignment recess 90 is structured to allow the associated moving alignment element 70 to pass through the transfer belt 14 as the upper tooling assembly moves into the second position. Further, each angled surface lower end 82 is disposed only over an alignment recess 90. That is, each angled surface lower end 82 path of travel extend only through an alignment recess 90. In this configuration, and when a shell's 1 initial alignment position positions the shell 1 against the perimeter of each transfer belt aperture 30, a moving alignment element 70 moving from the first position to the second position will not contact the shell 1. That is, the shell 1, even when partially formed will always stay within the perimeter of a transfer belt aperture 30. Thus, as the angled surface lower end 82 passes through an alignment recess 90, and as the alignment recess 90 is outside the perimeter of a transfer belt aperture 30, the angled surface lower end 82 path of travel will never be through a shell 1.
The number of alignment cavities 110 are cavities in the lower forming construct 23, in the exemplary embodiment, in die 24. Each alignment cavity 110 is disposed in the path of an associated moving alignment element 70. Thus, in the exemplary embodiment described herein, there are a first alignment cavity 110A, a second alignment cavity 110B, a third alignment cavity 110C, a fourth alignment cavity 110D, a fifth alignment cavity 110E, and a sixth alignment cavity 110F. Each alignment cavity 110 is sized and shaped to loosely correspond to the associated moving alignment element 70.
It is noted that, in an exemplary embodiment, each of the number of alignment elements 62 are disposed in positions corresponding to the moving alignment elements 70. That is, for a generally rectangular shell 1, there is a first alignment element 62A, a second alignment element 62B, a third alignment element 62C, a fourth alignment element 62D, a fifth alignment element 62E, and a sixth alignment element 62F. As noted above and for descriptive purposes, and as used herein, the number of alignment elements 62, such as the number of alignment elements 62 described in this paragraph, are described in relation to a shell 1 as if the shell 1 were at the station of the tooling assembly 16 including the alignment assembly 60; it is understood that such a description is for reference only and that a shell 1 does not have to be in the press assembly 10 for the number of alignment elements 62 to be in the identified locations. The first alignment element 62A and the second alignment element 62B are disposed generally opposite each other and on opposite sides of the shell first axis 8. Further, the third alignment element 62C and the fourth alignment element 62D are disposed generally opposite each other and on opposite sides of the shell second axis 9. Further, the fifth alignment element 62E and the sixth alignment element 62F are also disposed generally opposite each other and on opposite sides of the shell second axis 9.
In operation, as shown in
As the upper tooling assembly 18 moves into the second position, the angled surface lower end 82 of each moving alignment element 70 moves into an associated alignment recess 90, as shown in
In an exemplary embodiment, the upper tooling assembly angled surface 26 is at a first elevation. The angled surface lower end 82 is at a second elevation. The angled surface upper end 84 is at a third elevation. The third elevation generally corresponds to the first elevation. In this configuration, and with the motions described above, the shell is in the intermediate alignment position only for a moment. That is, the operative engagement of the shell 1, i.e., the movement of the shell 1, is substantially continuous.
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.
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| Entry |
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| Number | Date | Country | |
|---|---|---|---|
| 20170252793 A1 | Sep 2017 | US |
