EP2114771B1 - Rotary seamer - Google Patents
Rotary seamer Download PDFInfo
- Publication number
- EP2114771B1 EP2114771B1 EP08719485A EP08719485A EP2114771B1 EP 2114771 B1 EP2114771 B1 EP 2114771B1 EP 08719485 A EP08719485 A EP 08719485A EP 08719485 A EP08719485 A EP 08719485A EP 2114771 B1 EP2114771 B1 EP 2114771B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- seaming
- cavity
- seamer
- block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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- 238000004826 seaming Methods 0.000 claims abstract description 85
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 238000011161 development Methods 0.000 claims abstract description 6
- 230000008030 elimination Effects 0.000 claims description 4
- 238000003379 elimination reaction Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
- B65B59/04—Machines constructed with readily-detachable units or assemblies, e.g. to facilitate maintenance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
- B65B7/2842—Securing closures on containers
- B65B7/285—Securing closures on containers by deformation of the closure
Definitions
- the present invention relates to a rotary seamer.
- a seamer is a machine that enables to apply a lid to a container to close it hermetically, connecting the edge of the lid to the edge of the container by folding them one onto the other.
- Such containers have cylindrical geometry, e.g. they are constituted by cans.
- seaming is achieved by setting the container in rotation around its own axis, in a seaming station in which the container interacts with an appropriately shaped idle pivot, i.e. shaped such as to cause said folding of the edges of the container and of the corresponding lid.
- the seaming station is pivotally associated to a seaming turret, also called carrousel because it rotates around its own axis.
- the seamer comprises a plurality of seaming blocks, each provided, according to the seamer model, with one or two idle pivots and connected to a shaft hinged on the seaming turret.
- each idle pivot is made to interact (one at a time) with the container. More specifically, once the container and the lid are integral with the seaming site (through the action of a mandrel and the vertical thrust of a piston), the seaming operation starts. Following the profile of a cam, a lever causes said shaft to rotate on its own axis in such a way as to make first an idle pivot and then the other one approach the container; during these approaching motions, the sheet metal of container and lid are first rolled together, then crushed obtained a hermetic seal between the interior of the can and the external environment.
- US 5358369 discloses a rotary seamer according to the preamble of claim 1.
- the present invention relates, in particular, to the manner of connection of the seaming block to the shaft.
- the technical solution of the invention relates to some fundamental components of the seaming turret, such as the seaming block and the shaft whereon the seaming block must be mounted.
- the idle pivots mounted on the seaming block are the tools whereon most of the seaming result depends, so it is of fundamental importance that the mechanism that makes them work is as rigid and free of play as possible.
- the seaming block moves in an alternating rotation to make first one idle pivot work and then the other one and the work load thus produces an alternating torque
- the seaming block loses stiffness because both solutions in practice allow a certain play in the direction of rotation of the seaming block relative to the axis of the shaft.
- the play is due to the conicity, which is not sufficient to lock the two components together, and to the clearance required for mounting the tongue; in the second case, the play is the required one to mount the groove in its seat.
- the seaming block defines a cavity with longitudinal development, complementarily shaped relative to an end of the shaft with square cross section, in order to be coupled thereto by inserting the shaft into the cavity; in these cases, means are used to anchor the seaming block to the shaft transversely, which act in a predetermined, transverse direction such as to create at least one contact surface between shaft and cavity
- An object of the present invention is to eliminate the aforesaid drawbacks and to make available a seamer in which the mounting of the seaming blocks on the respective shafts is fast and particularly strong and precise.
- the shaft and the cavities are so shaped that said contact surface has at least one oblique portion relative to the direction in which said means act.
- the seamer is also provided, originally, with means for eliminating the plays linked to the construction tolerances of the seaming block and of the shaft.
- Said means comprise, in particular,
- the reference number 1 designates a seamer according to the present invention, whereof is shown, in particular, a portion of a seaming turret 2 rotating around its own axis 3.
- a pan 4 and a mandrel 5 which define a seaming site, to set a container 6 and a lid 7 in rotation around their own axis 8.
- the reference number 9 designates a seaming block provided with rotating idle pivots 10 (in particular a first and a second rotating pivot, but according to the seamer model there may be a single pivot per block and consequently the number of the blocks and of the pivots doubles).
- the seaming block 9 is anchored to a shaft 11 hinged on the seaming turret 2, such that it can rotate around its own axis 12.
- FIG. 2 shows an exploded perspective view of the shaft 11 and of the seaming block 9.
- the shaft 11 has a first end 13, hinged in the seaming turret 2, and a second end 14.
- the seaming block 9 internally defines a cavity 15 with longitudinal development, complementarily shaped relative to said second end 14 of the shaft 11 in such a way that it can be coupled thereto by inserting the shaft 11 into the cavity 15. Note that a certain play is provided between the cavity 15 and the second end 14 of the shaft 11, to facilitate the insertion of one into the other.
- said second end 14 of the shaft 11 and the cavity 15 preferably have constant section along a longitudinal axis (i.e. along the axis 12 of rotation of the shaft 11).
- the reference number 16 designates means for anchoring the seaming block 9 to the shaft 11.
- Said means are associated to the seaming block 9 in such a way as to act in a predetermined transverse direction 17 to create at least one contact surface between the shaft 11 and the cavity 15, oblique relative to the direction in which the means act.
- said means are associated to the seaming block 9 in such a way as to act in a said predetermined transverse direction 17 to create preferably two contact surfaces between the shaft 11 and the cavity 15, oblique relative to the direction in which the means act.
- Said second end 14 of the shaft 11, originally, has triangular prism shape.
- the second end 14 (and consequently the cavity 15 of the seaming block 9) may have different conformations.
- said second end 14 may have triangular or trapezoidal section.
- the conformation of the second end 14 is such that the locking means, acting on said second end 14 in said predetermined direction 17, determine a distribution of pressure on at least one surface (but preferably two surfaces) of contact between shaft 11 and cavity 15 not orthogonal to said predetermined direction.
- a first threaded thrusting element 18 engages in a through hole obtained in the seaming block 9, to place said cavity 15 in communication with the exterior. Said first thrusting element 18 is movable in said predetermined transverse direction 17.
- a screw 21 is coupled to the seaming block 9.
- said screw 21 is threaded with the same pitch as the first thrusting element 18 and it is movable in a cavity (substantially a through hole) obtained internally to the screw 18 itself with appropriate threading.
- first thrusting element 18 Inside the first thrusting element 18 is also housed a ball 22, positioned between one end of the screw 21 and the cavity 15, or the end 14 of the shaft 11.
- the ball 22 is free to move but not to exit said cavity internal to the first thrusting element 18, prevented by a special projection 23 (shown in figure 5 ).
- the ball 22 and the screw 21 constitute a second thrusting element.
- the end 14 of the shaft 11 (in particular its surface 19 orthogonal to said predetermined direction 17) defines a countersink 24, preferably having conical shape.
- Said countersink 24 is positioned such that, when the second end 14 of the shaft 11 is inserted in the cavity 15, an axis of symmetry of the countersink 24 is parallel to said predetermined direction 17, but at a predetermined distance therefrom, in order to produce a certain misalignment between said second thrusting element and the countersink 24.
- a pressure is created between the ball 22 and a surface of the countersink 24; this entails a relative displacement of the seaming block 9 relative to the shaft 11, in a plane orthogonal to said predetermined direction 17 (in particular vertically, because horizontally the cavity 15 and the end 14 centre themselves), tending towards an alignment of the axis of the second thrusting element (i.e. of said predetermined direction 17) relative to the axis of the countersink 24.
- the second thrusting element may also comprise a thrusting element movable between a position of non interference with the end 4 of the shaft 11 and a position in which it presses its own rounded end (e.g. with hemispherical shape) against the surface of the countersink 24.
- a ball 22 made of thermally hardened stainless steel is used, which is thrust out of its seat in such a way that relative to the countersink 24 there is no relative sliding of the surface but only a thrust.
- the threaded element i.e. the screw 21
- the threaded element can thus be made of stainless steel, with the ability to resist corrosion.
- the present invention also makes available a method for mounting the seaming block 9 in the shaft 11.
- a first step (shown in figures 3 and 4 ) the seaming block 9 is applied to the shaft 11.
- a second step (shown in figures 6 and 7 ) enables to obtain an elimination of the plays, as follows.
- the ball 22 is thrust against the second end 14 of the shaft 11 at the countersink 24.
- a dual effect is produced: in the first place, the seaming block 9 is made to adhere to the shaft 11, eliminating horizontal play, then the seaming block 9 is thrust to abut against the shaft 11 eliminating vertical play.
- a third step (shown in figures 8 and 9 ) enables to obtain a locking of the seaming block, as follows.
- stiffness is provided to the system by tightening the first thrusting element 18 (which is preferably a threaded element).
- the second thrusting element i.e. the screw 21
- first thrusting element 18 moving it towards the seaming block 9 and pressing it against it, in particular on a surface of the seaming block 9 orthogonal to the direction of advance of the first thrusting element 18 (i.e. said predetermined transverse direction).
- the pitch of the inner and outer threads of both thrusting elements must be equal, in order not to alter the position of the second thrusting element that eliminated play.
- rollers In the first place, maintenance times are considerably reduced; the result of eliminating mounting plays makes it possible to maintain unaltered the adjustments of the idle pivots 10, hereafter called rollers.
- Adjusting the rollers means their positioning relative to the mandrel 5 obtained acting on appropriate adjusting screws (not shown because they are not part of the present invention). Adjustment of the rollers 10 is achieved by attempts and it consists of a major part of the time required to set up the machine; obviously, the more rollers need to be adjusted, the longer the time required to do so, so eliminating this activity translates into an economic advantage.
- the particular conformation of the second end 14 of the shaft 11 and of the cavity 15 also entails that the step of associating the seaming block 9 to the shaft 11 occurs in a univocal angular position of the seaming block 9 relative to the shaft 11, even though the execution of said step of associating is particularly rapid.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pivots And Pivotal Connections (AREA)
- Sewing Machines And Sewing (AREA)
- Supercharger (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Valve Device For Special Equipments (AREA)
- Clamps And Clips (AREA)
- Centrifugal Separators (AREA)
Abstract
Description
- The present invention relates to a rotary seamer.
- A seamer is a machine that enables to apply a lid to a container to close it hermetically, connecting the edge of the lid to the edge of the container by folding them one onto the other.
- Such containers have cylindrical geometry, e.g. they are constituted by cans.
- In practice, seaming is achieved by setting the container in rotation around its own axis, in a seaming station in which the container interacts with an appropriately shaped idle pivot, i.e. shaped such as to cause said folding of the edges of the container and of the corresponding lid.
- The seaming station is pivotally associated to a seaming turret, also called carrousel because it rotates around its own axis.
- According to the prior art in the field of seamers, during the seaming operation the container (rotating in the seaming station) interacts with a first and with a second idle pivot, in succession.
- For this purpose, the seamer comprises a plurality of seaming blocks, each provided, according to the seamer model, with one or two idle pivots and connected to a shaft hinged on the seaming turret.
- In this way, rotating said shaft first in one direction and then in the other, each idle pivot is made to interact (one at a time) with the container. More specifically, once the container and the lid are integral with the seaming site (through the action of a mandrel and the vertical thrust of a piston), the seaming operation starts. Following the profile of a cam, a lever causes said shaft to rotate on its own axis in such a way as to make first an idle pivot and then the other one approach the container; during these approaching motions, the sheet metal of container and lid are first rolled together, then crushed obtained a hermetic seal between the interior of the can and the external environment.
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US 5358369 discloses a rotary seamer according to the preamble ofclaim 1. - This stated, note that the present invention relates, in particular, to the manner of connection of the seaming block to the shaft.
- Therefore, the technical solution of the invention relates to some fundamental components of the seaming turret, such as the seaming block and the shaft whereon the seaming block must be mounted.
- The idle pivots mounted on the seaming block are the tools whereon most of the seaming result depends, so it is of fundamental importance that the mechanism that makes them work is as rigid and free of play as possible.
- Moreover, it is important for the removal and mounting of the seaming blocks on the turret to be as rapid as possible, to speed machine maintenance operations.
- Currently, there are mainly two types of shaft ends for mounting the seaming block on the related shaft: the bevel one with disc shaped tongue and the grooved one.
- During the seaming operation, the seaming block moves in an alternating rotation to make first one idle pivot work and then the other one and the work load thus produces an alternating torque
- Stressed in this way, the seaming block loses stiffness because both solutions in practice allow a certain play in the direction of rotation of the seaming block relative to the axis of the shaft.
- In the first case, the play is due to the conicity, which is not sufficient to lock the two components together, and to the clearance required for mounting the tongue; in the second case, the play is the required one to mount the groove in its seat.
- In other technical solutions, the seaming block defines a cavity with longitudinal development, complementarily shaped relative to an end of the shaft with square cross section, in order to be coupled thereto by inserting the shaft into the cavity; in these cases, means are used to anchor the seaming block to the shaft transversely, which act in a predetermined, transverse direction such as to create at least one contact surface between shaft and cavity
- In any case, known solutions are disadvantageous because they require relatively long mounting times and they do not allow to reach high levels of precision and strength in the assembly.
- An object of the present invention is to eliminate the aforesaid drawbacks and to make available a seamer in which the mounting of the seaming blocks on the respective shafts is fast and particularly strong and precise.
- Said object is fully achieved by the seamer of the present invention, which is characterised by the content of
claim 1. - Advantageously, the shaft and the cavities are so shaped that said contact surface has at least one oblique portion relative to the direction in which said means act.
- The seamer is also provided, originally, with means for eliminating the plays linked to the construction tolerances of the seaming block and of the shaft. Said means comprise, in particular,
- a first thrusting element associated to said seaming block and movable in said predetermined transverse direction between a position of non interference with the shaft and a position of tightening, in which it presses on a surface of the shaft that is orthogonal to said transverse direction;
- a second thrusting element associated to said seaming block and movable in said predetermined transverse direction or parallel thereto between a position of non interference with the shaft and a working position, in which it presses one of its ends having rounded shape on a surface of a countersink defined by the shaft on said surface, orthogonal to said transverse direction.
- This and other characteristics shall become more readily apparent from the following description of a preferred embodiment, illustrated purely by way of non limiting example in the accompanying drawing tables, in which:
-
figure 1 shows a partially sectioned front view of a seamer according to the present invention; -
figure 2 shows an exploded view of a detail of the seamer offigure 1 , i.e. a shaft and a seaming block; -
figure 3 shows a sectioned view, according to a transverse plane, of the detail offigure 2 ; -
figure 4 shows a sectioned view, according to a longitudinal plane, of the detail offigure 2 ; -
figure 5 shows an enlargement of the detail A offigure 4 ; -
figure 6 shows the detail offigure 3 , in a subsequent mounting step; -
figure 7 shows the detail offigure 4 , in a subsequent mounting step; -
figure 8 shows the detail offigure 3 , in an additional subsequent mounting step; -
figure 9 shows the detail offigure 4 , in an additional subsequent mounting step. - In
figure 1 , thereference number 1 designates a seamer according to the present invention, whereof is shown, in particular, a portion of aseaming turret 2 rotating around itsown axis 3. To theseaming turret 2 are pivotally associated apan 4 and a mandrel 5, which define a seaming site, to set acontainer 6 and alid 7 in rotation around theirown axis 8. Thereference number 9 designates a seaming block provided with rotating idle pivots 10 (in particular a first and a second rotating pivot, but according to the seamer model there may be a single pivot per block and consequently the number of the blocks and of the pivots doubles). Theseaming block 9 is anchored to ashaft 11 hinged on theseaming turret 2, such that it can rotate around itsown axis 12. -
Figure 2 shows an exploded perspective view of theshaft 11 and of theseaming block 9. Theshaft 11 has afirst end 13, hinged in theseaming turret 2, and asecond end 14. - The
seaming block 9 internally defines acavity 15 with longitudinal development, complementarily shaped relative to saidsecond end 14 of theshaft 11 in such a way that it can be coupled thereto by inserting theshaft 11 into thecavity 15. Note that a certain play is provided between thecavity 15 and thesecond end 14 of theshaft 11, to facilitate the insertion of one into the other. - Note that said
second end 14 of theshaft 11 and thecavity 15 preferably have constant section along a longitudinal axis (i.e. along theaxis 12 of rotation of the shaft 11). - In the figures, the
reference number 16 designates means for anchoring theseaming block 9 to theshaft 11. Said means are associated to theseaming block 9 in such a way as to act in a predeterminedtransverse direction 17 to create at least one contact surface between theshaft 11 and thecavity 15, oblique relative to the direction in which the means act. Note that said means are associated to theseaming block 9 in such a way as to act in a said predeterminedtransverse direction 17 to create preferably two contact surfaces between theshaft 11 and thecavity 15, oblique relative to the direction in which the means act. - Said
second end 14 of theshaft 11, originally, has triangular prism shape. - However, the second end 14 (and consequently the
cavity 15 of the seaming block 9) may have different conformations. For example, saidsecond end 14 may have triangular or trapezoidal section. In any case, the conformation of thesecond end 14 is such that the locking means, acting on saidsecond end 14 in saidpredetermined direction 17, determine a distribution of pressure on at least one surface (but preferably two surfaces) of contact betweenshaft 11 andcavity 15 not orthogonal to said predetermined direction. - Said means for anchoring the
seaming block 9 to theshaft 11 are obtained, in the preferred embodiment illustrated herein, in the manner described hereafter. - A first threaded
thrusting element 18 engages in a through hole obtained in theseaming block 9, to place saidcavity 15 in communication with the exterior. Saidfirst thrusting element 18 is movable in said predeterminedtransverse direction 17. - When the
second end 14 of theshaft 11 is inserted into thecavity 15, operating thefirst thrusting element 18 on asurface 19 of saidend 14 orthogonal to saidpredetermined direction 17, a pressure is created in acontact surface 20 between theend 14 and the cavity 15 (as shown infigure 8 ). - A
screw 21 is coupled to theseaming block 9. Preferably, saidscrew 21 is threaded with the same pitch as thefirst thrusting element 18 and it is movable in a cavity (substantially a through hole) obtained internally to thescrew 18 itself with appropriate threading. - Inside the first thrusting
element 18 is also housed aball 22, positioned between one end of thescrew 21 and thecavity 15, or theend 14 of theshaft 11. Theball 22 is free to move but not to exit said cavity internal to the first thrustingelement 18, prevented by a special projection 23 (shown infigure 5 ). Theball 22 and thescrew 21 constitute a second thrusting element. - Moreover, the
end 14 of the shaft 11 (in particular itssurface 19 orthogonal to said predetermined direction 17) defines acountersink 24, preferably having conical shape. Saidcountersink 24 is positioned such that, when thesecond end 14 of theshaft 11 is inserted in thecavity 15, an axis of symmetry of thecountersink 24 is parallel to saidpredetermined direction 17, but at a predetermined distance therefrom, in order to produce a certain misalignment between said second thrusting element and thecountersink 24. - Operating the second thrusting element, i.e. operating the screw, a pressure is created between the
ball 22 and a surface of thecountersink 24; this entails a relative displacement of the seamingblock 9 relative to theshaft 11, in a plane orthogonal to said predetermined direction 17 (in particular vertically, because horizontally thecavity 15 and theend 14 centre themselves), tending towards an alignment of the axis of the second thrusting element (i.e. of said predetermined direction 17) relative to the axis of thecountersink 24. - It is thereby possible to obtain, originally, an elimination of the plays due to construction tolerances.
- Note that the second thrusting element, alternatively to the preferred embodiment illustrated (which provides the
screw 21 and the ball 22), may also comprise a thrusting element movable between a position of non interference with theend 4 of theshaft 11 and a position in which it presses its own rounded end (e.g. with hemispherical shape) against the surface of thecountersink 24. - However, it should be noted that the technical solutions providing for the use of the
ball 22 presents some disadvantages. - To obtain the elimination of the plays, superficial pressures must be exerted, so the pressing element must be sufficiently hard not to be deformed. It is not possible to use a threaded element with spherical head made of thermally hardened steel because it would corrode, being exposed to the outside environment. The same element made of stainless steel cannot be used, because it would seize together with the pivot because of the sliding of the spherical surface on the conical surface of the
countersink 24 during the screwing operation; moreover, a stainless steel screw stressed to the load necessary to eliminate play would be deformed in the pressure area, to the point that it could not longer be extracted. - On the contrary, in the preferred embodiment a
ball 22 made of thermally hardened stainless steel is used, which is thrust out of its seat in such a way that relative to thecountersink 24 there is no relative sliding of the surface but only a thrust. In this way, the threaded element (i.e. the screw 21) can thus be made of stainless steel, with the ability to resist corrosion. - The present invention also makes available a method for mounting the seaming
block 9 in theshaft 11. - Said mounting method is described in detail hereafter.
- In a first step (shown in
figures 3 and 4 ) the seamingblock 9 is applied to theshaft 11. - The seaming
block 9, whereon are mounted the threadedelement ball 22, is applied to thesecond end 14 of theshaft 11, preferably with triangular prism shape. - A second step (shown in
figures 6 and 7 ) enables to obtain an elimination of the plays, as follows. - Acting on the
screw 21, theball 22 is thrust against thesecond end 14 of theshaft 11 at thecountersink 24. In this way, a dual effect is produced: in the first place, the seamingblock 9 is made to adhere to theshaft 11, eliminating horizontal play, then the seamingblock 9 is thrust to abut against theshaft 11 eliminating vertical play. - The
ball 22 then makes surfaces of the seamingblock 9 and of the shaft 11 (at the second end 14) that are opposite and face each other (having triangular profiles) adhere to each other and it produces a resulting vertical that thrusts the seamingblock 9 upwards to abut on theshaft 11. A third step (shown infigures 8 and 9 ) enables to obtain a locking of the seaming block, as follows. - Once plays are eliminated through the second step, stiffness is provided to the system by tightening the first thrusting element 18 (which is preferably a threaded element).
- Keeping still with a spanner the second thrusting element (i.e. the screw 21), one acts on the first thrusting
element 18, moving it towards the seamingblock 9 and pressing it against it, in particular on a surface of the seamingblock 9 orthogonal to the direction of advance of the first thrusting element 18 (i.e. said predetermined transverse direction). The pitch of the inner and outer threads of both thrusting elements must be equal, in order not to alter the position of the second thrusting element that eliminated play. - Therefore, the following invention presents the following advantages.
- In the first place, maintenance times are considerably reduced; the result of eliminating mounting plays makes it possible to maintain unaltered the adjustments of the
idle pivots 10, hereafter called rollers. - Adjusting the rollers means their positioning relative to the mandrel 5 obtained acting on appropriate adjusting screws (not shown because they are not part of the present invention). Adjustment of the
rollers 10 is achieved by attempts and it consists of a major part of the time required to set up the machine; obviously, the more rollers need to be adjusted, the longer the time required to do so, so eliminating this activity translates into an economic advantage. - Moreover, the particular conformation of the
second end 14 of theshaft 11 and of thecavity 15, combined with the action of means pressing transversely in a predetermined direction, enables to obtain a particularly rapid and strong locking of the seamingblock 9 relative to theshaft 11. The particular conformation of thesecond end 14 of theshaft 11 and of thecavity 15 also entails that the step of associating the seamingblock 9 to theshaft 11 occurs in a univocal angular position of the seamingblock 9 relative to theshaft 11, even though the execution of said step of associating is particularly rapid.
Claims (12)
- A rotary seamer (1) comprising:- a rotating seaming turret (2);- a seaming station pivotally associated to the seaming turret (2) to set in rotation around its own axis (8) a container (6) to be seamed;- a shaft (11) having a first end (13) hinged in the seaming turret (2);- a seaming block (9) defining a cavity (15) with longitudinal development, complementarily shaped relative to a second end (14) of the shaft (11) in such a way that it can be coupled thereto by inserting the shaft (11) into the cavity (15), in order to rotate integrally with the shaft to interact with the container, seaming it;- means (16) for transversely anchoring the seaming block (9) to the shaft (11), acting in a predetermined transverse direction (17) such as to create at least one contact surface (20) between shaft (11) and cavity (15), said second end (14) of the shaft (11) and the cavity (15) being so shaped that said contact surface (20) has at least one oblique portion relative to the direction (17) in which said means (16) act,characterized in that said means (16) for anchoring transversely the seaming block (9) to the shaft (11) comprises:- a first thrust element (18) associated to said seaming block (9) and movable in said predetermined transverse direction (17) between a position of non interference with the shaft (11) and a position of tightening, in which it presses on a surface (19) of the shaft (14) that is orthogonal to said transverse direction (17);- a second thrusting element associated to said seaming block (9) and movable in said predetermined transverse direction (17) or parallel thereto between a position of non interference with the shaft (11) and a working position, in which it presses one of its ends having rounded shape on a surface of a countersink (24) defined by the shaft (11) on said surface (19) orthogonal to said transverse direction.
- Seamer as claimed in claim 1, wherein the second end (14) of the shaft (11) and the cavity (15) are so shaped that said contact surface (20) defines a first oblique portion and a second oblique portion, mutually opposite relative to the direction (17) in which said means act.
- Seamer as claimed in claim 2, wherein the direction (17) in which said means (16) act intersects a straight line defined by the intersection of said first and second oblique portion or of their extensions.
- Seamer as claimed in any of the claims 1 through 3, wherein said second end (14) of the shaft (11) and said cavity (15) have triangular or trapezoidal section.
- Seamer as claimed in claim 1, wherein said second end (14) of the shaft (11) and said cavity (15) define between them a predetermined play, to facilitate an insertion / extraction of the shaft into and out of the cavity.
- Seamer as claimed in claim 1, wherein said second end (14) of the shaft (11) and said cavity (15) have substantially constant section along their longitudinal development.
- Seamer as claimed in claim 1, wherein said second end (14) of the shaft (11) and said cavity (15) are so shaped as to require a predetermined relative angular position to enable said insertion of the shaft into the cavity.
- Seamer as claimed in claim 1, wherein said countersink (24) is cone shaped.
- Seamer as claimed in claim 8, wherein the direction in which the second thrusting element acts is parallel but positioned at a predetermined distance relative to an axis of symmetry of said countersink.
- Seamer as claimed in any of the preceding claims, wherein said thrusting element comprises:- a ball (22);- a threaded element (21) movable in said transverse direction and interacting with the ball to thrust it against the surface of said countersink (24), when the second thrusting element is in the working position.
- Seamer as claimed in claim 10, wherein the first thrusting element (18) defines internally a threaded cavity with a predetermined pitch and externally a thread having the same pitch, said first thrusting element (18) being inserted in a through hole drilled in the seaming block (9) and containing in said internal cavity the threaded element (21) and the ball (22) of the second thrusting element.
- Method for mounting a seaming block (9) on a shaft (11) having a first end (13) hinged in a seaming turret (22) of a seamer (1), said seaming block (9) defining a cavity (15) with longitudinal development shaped complementarily relative to a second end (14) of the shaft (11), characterised in that it comprises the following steps:- inserting the second end of the shaft (14) into the cavity (15) to couple the seaming block (9) to the shaft (11);- operating a second thrusting element associated to the seaming block (9) in a predetermined transverse direction (17) or parallel thereto, such as to press an end having round shape of the thrusting element on a surface of a countersink (24) defined by the shaft (11) on its own surface orthogonal to said transverse direction, in order to obtain the elimination of the plays;- operating anchoring means associated to the seaming block (9) and active on the shaft (11) in a predetermined transverse direction (17) such as to create two contact surfaces (20) between shaft (11) and cavity (15) that are oblique relative to the direction (17) in which the anchoring means act, said anchoring means comprising a first thrust element (18) associated to said seaming block (9) and movable in said predetermined transverse direction (17) between a position of non interference with the shaft (11) and a position of tightening, in which it presses on a surface (19) of the shaft (14) that is orthogonal to said transverse direction (17), in order to obtain a locking of the seaming block.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000009A ITPR20070009A1 (en) | 2007-03-01 | 2007-03-01 | ROTARY SEWER |
PCT/IB2008/050703 WO2008104940A1 (en) | 2007-03-01 | 2008-02-27 | Rotary seamer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2114771A1 EP2114771A1 (en) | 2009-11-11 |
EP2114771B1 true EP2114771B1 (en) | 2011-02-16 |
Family
ID=39495506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08719485A Not-in-force EP2114771B1 (en) | 2007-03-01 | 2008-02-27 | Rotary seamer |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100119335A1 (en) |
EP (1) | EP2114771B1 (en) |
AT (1) | ATE498549T1 (en) |
DE (1) | DE602008004991D1 (en) |
ES (1) | ES2361379T3 (en) |
IT (1) | ITPR20070009A1 (en) |
WO (1) | WO2008104940A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4086747A (en) * | 1977-05-05 | 1978-05-02 | Aluminum Company Of America | Headset device for a capping machine |
US5320469A (en) * | 1991-10-30 | 1994-06-14 | Mitsubishi Jukogyo Kabushiki Kaisha | Can seamer |
US7111484B2 (en) * | 2004-04-09 | 2006-09-26 | Lonero Vincent J | Plug-in lower tool |
-
2007
- 2007-03-01 IT IT000009A patent/ITPR20070009A1/en unknown
-
2008
- 2008-02-27 AT AT08719485T patent/ATE498549T1/en not_active IP Right Cessation
- 2008-02-27 WO PCT/IB2008/050703 patent/WO2008104940A1/en active Application Filing
- 2008-02-27 EP EP08719485A patent/EP2114771B1/en not_active Not-in-force
- 2008-02-27 DE DE602008004991T patent/DE602008004991D1/en active Active
- 2008-02-27 US US12/528,654 patent/US20100119335A1/en not_active Abandoned
- 2008-02-27 ES ES08719485T patent/ES2361379T3/en active Active
Also Published As
Publication number | Publication date |
---|---|
ITPR20070009A1 (en) | 2008-09-02 |
WO2008104940A1 (en) | 2008-09-04 |
US20100119335A1 (en) | 2010-05-13 |
ATE498549T1 (en) | 2011-03-15 |
DE602008004991D1 (en) | 2011-03-31 |
WO2008104940B1 (en) | 2008-11-13 |
ES2361379T3 (en) | 2011-06-16 |
EP2114771A1 (en) | 2009-11-11 |
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