AU682782B2 - Die set for sheet material - Google Patents

Description

1

AUSTRALIA

Patents Act COMPLETE SPECIFICATION

(ORIGINAL)

Application Number: Lodged: Class Int. Class Complete Specification Lodged: Accepted: Published: Priority Related Art: 0 0 0 0 000 0 *0o 0* C 0 *000 0 Applicant: STRAMIT CORPORATION LIMITED 005 010 195) of: 15th FLOOR 390 ST KILDA ROAD MELBOURNE VIC 3004

AUSTRALIA

Address for Service is: PHILLIPS ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street MELBOURNE 3000 AUSTRALIA Complete Specification for the invention entitled: DIE SET FOR SHEET MATERIAL Our Reference: IRN 384010 The following statement is a full description of this invention, including the best method of performing it known to applicant

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I I J DIE SET FOR SHEET MATERIAL This invention relates to a method and apparatus for impressing, embossing or piercing (herein collectively referred to as "configuring") sheet material, such as sheet metal. The method and apparatus of the invention is particularly concerned with configuring in a manner providing a repeated pattern along sheet material as it travel along a path.

To set the context for further description of the invention, one illustrative example of use of the invention is in the production of eaves guttering provided with a series of overflow openings spaced uniformly along its front wall.

Conventionally, methods of providing the openings in continuous sheet metal from which the guttering is to be formed suffer from the disadvantage of i0 "oil-canning". That is, as each opening is formed, surrounding metal is stretched 0 and due to this, the outer surface of the front wall of resultant guttering exhibits 0 0 0readily discernible stretch marks which detract from the overall appearance of the guttering.

One method for configuring sheet metal is by use of mating contoured rollers between which the material travels. One difficulty with this method is that S*0 the design of the contour of the rollers is complicated by radius effects and is not simply complementary to a pattern to result from configuring to be formed. Also, .0.0 machinery for handling the sheet material, and for shaping it with a required form 00 such as in forming gutter from continuous sheet material, is difficult to reverse as can be necessary from time to time to clear blockages. Additionally, this method can result in oil-canning effects.

Another method for configuring sheet material, in particular configuring by piercing, involves the use of a "flying punch" which has a die set which reciprocates along a path of travel for the sheet material. The die set, which may be hydraulically or pneumatically reciprocatable, is actuated to engage the sheet material at an upstream location, and travels with the material to a downstream location before disengaging the sheet material and returning to the upstream location. The flying punch mechanism is both noisy and complicated, while the timing of its reciprocation and actuation needs to be linked precisely to the speed

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of travel of the sheet material. This method also can give rise to the oil-canning effect.

The present invention is directed to providing an improved method and apparatus for configuring sheet metal.

In the present invention, the configuring of sheet material is achieved by providing two series of tools, with the tools of each series interconnected in an endless loop and movable around a guide means. The arrangement is such that, as each tool of each series moves around the respective loop, it moves along a substantially linear path length or run which is substantially parallel with and adjacent to a plane along which the sheet material is movable. Also, at least during movement along the linear path, the tools of each series are adjacent to a respective one of opposite surfaces of the sheet material, with each tool of one series in register with a tool of the other series to provide a co-operable set of tools operable to provide configuring of a region of the sheet material therebetween.

During movement of the tools along the linear path, successive sets .thereof are operable to provide configuring of the sheet material at successive regions of the sheet material.

One tool of each set includes a punch device having a punch and a housing or punch carrier in which the punch is movable, with the other tool of each set comprising a reaction member. In a convenient arrangement, each tool of one series comprises a punch device, and each tool of the other series comprises a reaction member. However, some tools of each set may comprise a punch device, with the others comprising reaction members, subject to one tool of each set being a punch device and the other being a reaction member. Also, it is preferable that there be an equal number of tools in each series, although this is not essential.

Depending on the form of configuring required for the sheet material, each reaction member may comprise a die which is co-operable with a punch. In this context, the form of the die can vary, again depending on the shape and nature of configuring required.

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4 In one form, the die may define a recess with which a punch is co-operable. In this form, the arrangement may be such as to form a depression or dimple of a required shape in a region of the surface of the sheet material engaged by the punch. Such depression or dimple is formed by deforming the sheet material into the recess of the die, to provide a raised formation at the other surface of the sheet material.

In another form, the die may define a depression or opening with which a punch is co-operable to sever the sheet material at the region therebetween. The arrangement may be such as to displace the region fully from the sheet material, so as to provide either an opening therein, or a cut-out at a side edge thereof, of a 0S.required shape. Alternatively, the arrangement may be such that the region is partially displaced from the sheet material at an opening therein or at a side edge, such that the displaced region provides a tab of a required configuration which projects from the surface of the sheet material engaged by the die but which remains attached thereto.

While each reaction member may comprise a die, this is not necessarily the case. Thus, in the alternative form, each reaction member may simply comprise a reaction block which defines a substantially planar surface by which it engages a surface of the sheet material. In such arrangement, the reaction member may be such as to resist the action of a punch such that the latter acts to deform a region of the sheet material at a surface it engages, such as to form in that surface a depression or dimple of a required shape.

While the preceding description distinguishes between a tool comprising a punch device, and a reaction tool comprising a die or a reaction block, each tool of a set may in part comprise a punch and a reaction tool. Thus, for example, the arrangement may be such as to provide a dimple or depression in each surface of the sheet material which is adjacent to a raised formation at each -;urface.

The loops in which the tools of each series are movable may be substantially parallel. In a first arrangement, each loop is substantially perpendicular to a plane along which the sheet material is to be moved. In a second arrangement, each loop is substantially parallel to that plane. However, in each case, the tools of each set are co-operable in a direction which is RNC:SPECI, DOC substantially perpendicular to the plane; that is, laterally of the loops in the first arrangement and axially of the loops in the second arrangement. The term "axially" is used here as if the loops were somewhat circular rather than, as required, as having a substantially linear portion along which the tools of each set are co-operable.

In use of the invention, the tools of at least one series can be movable around their loop by the action of suitable drive means. In that case, movement of the sheet material preferably is solely in response to its engagement by the tools of successive sets. However, the converse arrangement is preferred. That is, after achieving engagement of the sheet material by the tools of at least one set, movement of the tools of each series around its loop preferably is achieved by movement of the sheet material along its path of movement. For this latter arrangement, it is preferable that the sheet material be drawn through an installation including the two series of tools, such as under the action of

S

downstream apparatus. The sheet material may, for example, comprise strip material, such as received from a supply roll. The apparatus may, for example, be a roll forming device for producing guttering or the like from the strip material after drawing the material through the installation. However, for each of these alternative drive arrangements, it is highly desirable for the tools of one set to continue to provide sufficient engagement with the sheet material, to provide a driving connection therebetween, until the sheet material is similarly engaged by S•the tools of at least one following set.

Where, as detailed above, the loops of each series of tools are substantially parallel to a plane along which the sheet material is to be moved, the tools of each set may be secured in assembly. This is a highly beneficial arrangement, since it facilitates accurate retention of registry between the tools of each set. Also, it enables a simplified arrangement for interconnecting the tools of each series in a respective loop.

A variety of arrangements are possible to interconnecting successive tools for each series. Thus, the interconnection may be by securing the tools to a common endless chain or belt for each series, with the chain or belt passing around a common pair of rotatable wheels or pulleys with which it drivingly

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6 engages. Alternatively, there may be a respective chain or belt and pair of wheels or pulleys for each series. Instead of a chain or belt, or a respective chain or t, the tools may be mounted on an endless series of pivotally interconnected rigid or flexible links which pass around a pair or respective pair of wheels or pulleys. In a further alternative, successive tools may be interconnected by a length of chain or by such link so as together therewith to form an endless loop.

In the latter case, in particular, a guideway means can be used to guide the tools of each series in their movement, with the tools carrying rollers or the like by which they engage the guideway means for movement therearound.

Particularly when, as described above, the tools of each set are secured in assembly, successive sets can be directly pivotally interconnected to provide the respective loops. As will be evident, this arrangement necessitates the same number of tools in each series, with each loop substantially parallel to a plane along which the sheet material is movable. Also, the series are axially adjacent in the sense that axially is used above, with each loop having a common form.

Considering the loop as having laterally spaced inner and outer peripheries, successive sets of tools preferably are pivotally interconnected adjacent to the inner periphery, such as by a respective pivot pin which has its axial extent substantially perpendicular to that plane. Each pivot pin may carry at least one roller which is constrained by a track which follows the common form of each loop "and which defines at least part of the guide means around which the loops are movable.

The tools of each set may be co-operable to provide required configuring of the sheet material by a variety of arrangements, depending in part on the nature of the sheet material. The sheet material may, for example, be of a plastics material or of a metal, cardboard, paperboard, Kraft paper or the like.

Thus, the relative ease with which it can be configured can vary substantially.

However where, as is preferred, the tools are movable in response to movement of the sheet material, the material of which it is comprised and its thickness necessitates that the sheet material has sufficient strength for this.

Particularly where the sheet material is of a metal or plastics material providing resistance to configuring, co-operation between the tools of each set to

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7 provide configuring can bt, provided by a cam action. Thus, the invention can include provision of cam means which engages the punch of each set of tools so as to move the punch to provide th3 configuring. Where each tool of one series includes a punch, the cam means may comprise a cam track which is engaged by the punch of successive tools of that series as they are moved along the linear path length, such as to progressively move the punch from a retracted position to an advanced position, in the course of movement along a part of that path length for which the tools of each set are to engage the sheet material. Where some of each series of tools include a punch, the cam means may comprise a respective such cam track for each series.

At least for each tool including a punch, the tool preferably is supported, at 0least during movement along the linear length of its loop, so as to position its oo.

housing or punch carrier in a constant relationship to a plane along which the sheet material is movable. The arrangement preferably is such that only the punch of each such tool (and any such ancillary fittings on the punch) is movable for the purpose of providing configuring, ie. that the punch moves relative to its housing. For this purpose, the housing or punch carrier can be guided by the guide means in such constant relationship. In one arrangement, the guide means can comprise a guide member such as a plate on which at least one roller mounted on the housing or punch carrier is engaged.

The punch of each punch device also may engage a guide member, such as a plate or track, by at least one roller mounted thereon, so as to cause movement of the punch from it advanced configuring position when the device is at a downstream part of the linear path. Such plate or track may be continuous around the or each loop and shaped along the linear path to enable each punch to move to its advanced position during movement of its device along an upstream part of that linear path. However, the plate or track may be discontinuous along the linear path, such as to enable movement of each punch to its advanced position, in response to cam means, without the need for shaping of the plate or track to allow for that movement.

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I I 1 8 Further preferred forms of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a schematic side elevation of an installation according to a first embodiment of the invention; Figure 2 is a schematic end elevation of the installation of Figure 1; Figure 3 is a schematic plan view of an installation according to a second embodiment of the invention; Figure 4 is a schematic end elevation of the installation of Figure 3; Figure 5 is a top plan view of an installation according to a third embodiment of the invention; Figure 6 is a front elevation of the installation of Figure i o Figure 7 substantially comprises a horizontal sectional view taken on line VII VII of Figure 6; Figure 8 corresponds to Figure 7 but after removal of a component of the installation; Figure 9 is a sectional view of line IX IX of Figure 6; Figure 10 is a plan view of a tool set of the installation of Figure 5; and Figure 11 is a sectional view taken on line XI XI of Figure With reference to Figures 1 and 2, the installation 10 includes a first series of tools 12, of which eight are shown, linked together in an upper endless loop L by movable links 14. The links 14 may comprise chains, or rods which are o pivotally connected at each end to successive tools 12 of the series. The loop L comprising tools 12 and links 14 is disposed vertically and passes around two horizontally spaced rotatable wheels 16. The arrangement is such that, between wheels 16, loop L has a lower horizontally extending run R along with loop L is substantially linear. Wheels 16 are rotatable, anti-clockwise in the arrangement shown, such that loop L is advanced therearound in the same direction, such that successive tools 12 move along run R.

Below and in the same plane as loop L, there is a second loop L which passes around wheels 18 and comprises tools 20 and links 22. The links 22 of loop Ll may be similar to links 14 of loop L. There are eight tools 20 in loop L, and wheels 18 are rotatable clockwise such that tools 20 progress along a

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I 9 substantially linear upper run R' of loop substantially parallel to progression of tools 12 of loop L. As show, the arrangement is such that, as tools 12 move along run R and tools 20 move along run each tool 12 is in register with a tool to provide successive tool sets S. However, the tools of each set S are slightly spaced to enable horizontally disposed sheet material 24 which is to be configured to pass between loops L and as shown by arrow A. That is, sheet material 24 is able to move in the common direction of tool 12, 20 of each set S, along and between runs R, R.

Each tool 12 comprises a punch 26 and a punch carrier 28, with each carrier 28 defining a bore 28a in which its punch 26 is movable. Each tool 12 is retained in loop L by links 14 connecting to its carrier 28, while each carrier in the arrangement shown is of plate-like form with its bore 28a extending laterally with respect to loop L. Each punch 26 is movable in the bore 28a between a retracted position in which its outer, configuring end is within its bore 28a and an advanced position in which that end projects outwardly from its bore 28a.

Each tool 20 comprises a die which defines a bore 20a. The arrangement is such that for each set S, comprising a tool 12 and a tool 20, the punch of the tool 12 is received in the bore 20a of the tool 20 when the punch is in its o advanced position.

Movement of each punch 26 to its advanced position occurs as its tool 12 moves along run R, and is achieved by a stationary cam track 30. As shown, the cam track 30 is mounted within loop L, above and along the run R. The track is positioned to engage the inner end of successive punches 26, ie. the inner end with respect to loop L or the upper end during movement of tools 12 along run R.

Also, the track 30 is shaped so as to force successive punches 26 to move progressiveiy to their advanced position and then to allow each punch 26 to return progressively to its retracted position, in the course of movement of tools 12 along run R. This action of the track is facilitated by roller means 32 mounted on the inner end of each punch 26 and by which the punch 26 engages the track In operation with installation 10, cam track 30 initially is raised to an inoperative position relative to the operative position shown, to enable punches

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26 of the tools 12 disposed along run R to move, or to be moved, to their retracted position. The leading end of sheet material 24 then is advanced in the direction of arrow A so as to extend through installation 10. Cam track 30 then is returned to its operative position to engage the punches 26 to the tools 12 thereunder. The punch 26 of the left hand one of those tools 12 is moved partially towards its advanced position, while the punch 26 of the intermediate one of those tools 12 is moved substantially to its advanced position, such that its lower end is received in bore 20a of the tool 20 of its set S. In achieving this, the punch 26 of the intermediate tool 12 achieves configuring of sheet material 24, in this instance piercing of material 24 to form an opening 24a therethrough.

Following return of track 30 to its operative position, operation is initiated to .oo.

achieve similar configuring of sheet material 24 at intervals therealong. This may be achieved by drive to one of wheels 16 and one of wheels 18, for movement of loop L and its tools 12 around wheels 16 and opposite movement of loop L and its tools 20 around wheels 18, such that the tools 12, 20 of each of successive sets S are in register. Resultant engagement of the tools of successive set S with material 24, and progressive movement of successive punches 26 to their advanced position, achieves the required configuring of material 24 at intervals therealong, and its advancement in the direction of arrow A. However, it is preferred that sheet material 24 itself is moved in the direction of arrow A. This may be by it being drawn in that direction by downstream apparatus, such as S' forming apparatus which processes material 24 as required. The apparatus may for example form material 24 into a required transverse profile, such as to produce guttering or the like.

Where sheet material 24 itself is moved in the direction of arrow A, engagement by the tools of successive sets S with material 24 draws those tools along runs R, However, in this case, or where drive is to wheels 16, 18, it is required that the tools of at least one set S are engaged with material 24 at all stages. Thus, before material 24 is disengaged by the tools of one set S, it is engaged by the tools of at least the next set S sufficiently to maintain drive between material 24 and loops L, L'.

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I L I b e~Lle~~ 11 In the arrangement illustrated, punches 26 configure sheet material by piercing it to form openings 24a which are intermediate the lateral side edges of material 24. However, by moving the path for material 24 to one side, punches 26 could form successive notches along one side edge thereof Also, rather than form openings or notches, punches 26 could form dimples or recesses in the surface of material 24 which they engage, with or without corresponding projections at the other surface. In the latter regard, such projections can be achieved if too!s 20 have a bore 20a or a recess, or avoided if tools 20 have simply a flat surface by which they engage material 24.

As indicated, the installation 10 of Figures 1 and 2 is schematic, while it can include further features, if required. Thus, a fixed support plate may be provided below run R to retain tools 20 in engagement with the lower surface of material 24. Additionally, around the inner periphery of loop L, there may be a guide track which engages with the roller means 32 of each punch 26 to assist in maintaining punches 26 in their retracted position where this is required.. The guide track may start at the downstream end of cam track 30, such that roller means 32 are received thereon, and extend parallel to loop L to the upstream end of the track 30. Alternatively, the guide track may extend within the full periphery of loop L, with a portion thereof along run R being parallel with, but below, cam track 30. Where the guide track does not extend along cam track 30, punches 26 may return to their retracted position by a spring provided in each tool, prior to being engaged by the guide track.

In general, the embodiment of Figures 3 and 4 readily will be understood from the description of installation 10 of Figures 1 and 2. Thus, in relation to the embodiment of Figures 3 and 4, the same reference numerals plus 100 are used, and description thereof principally is limited to matters of difference.

Installation 110 differs in large part as a consequence of loop L and loop L' being horizontally disposed. Thus, they are substantially parallel with, and adjacent to, a respective surface of sheet material 124. Again, loop L comprises one series of tools 112 interconnected by links 114 and extends around two wheels 116, with each tool 112 comprising a punch device. Also, loop LI

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a 12 comprises another series of tools 120 interconnected by links 122, while each tool 120 comprises a die.

Each wheel 116 is co-axial with a respective wheel 118 as a pair and rotatable on a common shaft 40 for each pair. The tool sets S project laterally outwardly from the loops L, while the tools 112, 120 of each set S are secured in assembly by a rigid bracket 42 therebetween. Also, a continuous support runner 44 is situated under the tools 120, to provide support for each set S around the full circumference of their movement around the axes of shafts 40. If required, roller means can be provided between tools 120 and runner 44.

Operation with installation 110 is similar to that detailed for installation However, in the case of installation 110, cam track 130 is above loop L, over its run R, rather than within loop L as in installation 10. Also, the movement of punches 126 and their co-operation with dies 120 is perpendicular to loops L, L, rather than parallel thereto as in installation Figures 5 to 11 show an installation having some of the characteristics of installation 110. In Figures 5 to 11, parts of installation 210 corresponding to parts of installation 110 have the same reference numeral, plus 100.

Installation 210 shown in Figures 5 to 11 is in accordance with a working prototype developed to punch a longitudinal series of apertures of a required configuration in steel strip sheet material. The steel strip is intended for production of guttering in which the apertures are to provide overflow openings in the front wall of the guttering. Drive for operation with installation 210 is by the steel strip being drawn therethrough by apparatus for forming the strip into guttering. In the drawings, the strip is depicted by numeral 224 where shown.

However, for ease of illustration, only the location of the inner edge of the strip 224 is depicted by line E-E in Figures 5, 7 and 8.

As shown most clearly in Figure 8, installation 210 has thirteen sets of tools 212, 220 providing die sets S, with successive sets S pivotally connected in an endless array. As in instailation 110 of Figures 3 and 4, the tools 212 comprise punch devices, each having a punch 226 and a punch carrier 228, in an upper loop L parallel with, and having a substantially linear run adjacent to the upper surface of, strip 224. Also, the tools 220 comprise dies each having an

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Ir ~er I L~a 13 opening 220a in register with the punch 226 of its set S, with tools 220 disposed in a lower loop L' parallel with, and having a substantially linear run adjacent to the lower surface of, strip 224.

As shown in Figures 8 to 11, each carrier 228 and each die tool 220 is of substantially rectangular form in plan -fiew. At its laterally inner, leading corner with respect to anti-clockwise movements of sets S as viewed in Figure 8, each carrier 228 has a cut-away 52 and, at its laterally inner trailing, corner, each carrier 228 has a boss 54. Also, each die tool 220 is oppositely formed at the corresponding corner, to provide a resultant boss 56 and cut-away 58. The boss 54 of each carrier 228 overlaps the boss 56 of the tool 220 of the next following set S. Successive sets S are secured in assembly by a respective substantially vertical pivot pin 60 inserted through the overlapping bosses. Each of the pins is secured by a circlip at its upper end, while the lower end carries a roller 62 for a purpose explained later herein.

WVith reference to Figures 5 and 6, installation 210 has a horizontally disposed, outer base plate 64 on which tool sets S are partly supported. At the laterally outer edge of each die tool 220, there is provided a pair of rollers which run on the upper surface of plate 64 to provide this support. Below the array of sets S and inwardly of rollers 65 there is an opening in plate 64 which is S. 20 defined by an inner peripheral edge 64a of plate 64. Edge 64a has the general shape of loops L, L' and pivot pins 60 project into the opening defined by the edge 64a.

Within the opening of plate 64, there is a horizontally disposed, central base plate 66. Support means (not shown) is provided to support the base plates 64 and 66 so that their upper surfaces are substantially co-planar. The periphery of plate 66 is substantially parallel to the loops L, L' for the tool sets S. Also, the periphery of plate 66 is spaced from the edge 64a of plate 64 to define an endless slot 67 therebetween. The lateral extent of tool sets S is such that they bridge slot 67. At the laterally inner edge of the die tool 220 of each set S, there is a respective roller 68 which rides on the upper surface of plate 66 adjacent to its periphery. Thus, each set S is in the form of a carriage, which is able to move

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14 around the loops L, L' for its tools 212, 220 by its rollers 65 riding on plate 64 and its roller 68 riding on plate 66.

The pivot pins 60 providing correction between successive tool sets S depend into slot 67 such that the roller 62 of each bears against the periphery of central plate 66. Thus, plate 66 provides partial lateral constraint preventing laterally inward movement of sets S. To complete this constraint, by preventing laterally outward movement of sets S, at least during their movement along the linear runs of loops L, a respective guide bar 69 is secured in slot 67, adjacent to the periphery of plate 66, along each linear run. Thus, during movement of sets S along each linear run, they are constrained against lateral movement by capture of the rollers 62 between the periphery of plate 66 and one of guide bars 69.

The die tool 220 of each set S comprises a body 70 which defines a stepped bore 70a, and a hardened die 71 which is firmly secured in a larger S. 15 diameter upper part of bore 70a. Die 71 defines a die hole 71a, with which the vrking end of punch 226 of tool 212 is co-operable.

The die tool 220 of each set S has a horizontally disposed, stepped upper surface. The arrangement is such that a laterally inner part of that surface is raised slightly relative to a laterally outer part at which die 71 is located. The top S 20 surface of die 71 is flush with that outer top surface part. The punch body 228 of the tool 212 of each set S has a horizontally disposed lower surface by which it is supported on the raised top surface part of its tool 220. Thus, a narrow slot 72 which opens at the outer, leading and trailing sides of each set S is defined between its tools 212, 220. This slot 72 has a dimension between those tools such that strip 224 is able to pass therethrough in its movement in the direction of arrow A. Also, the step in the top surface of each tool 220 can provide a guide for a side edge of strip 224 received therein but, if so, sets the limit to which configuring of strip 224 can be located inwardly of that edge.

As in previous embodiments, the body 228 of each punch tool 212 defines a bore 228a through which its punch 226 is movable between a raised, retracted position and a lowered, advanced position. Additionally, each bore 228a is stepped and has a hardened insert 73 secured in the larger diameter lower

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portion thereof. The lower surface of insert 73 is flush with the bottom surface of body 228. Insert 73 defines a narrow aperture through which a reduced diameter working end portion 226c of punch 226 projects when the latter is in its advance position. Hardened insert 73 acts to resist lifting of material of strip 224 after punch portion 226a has pierced strip 224 and punch 226 is then being moved to its retracted position.

Above insert 73 bore 228a is lined by a sleeve 74 which projects from bore 228a, above body 228. Sleeve 74 has a peripheral flange 74a which rests on the top surface of body 228 and, as shown in Figure 10, sleeve 74 is secured in relation to bod- 228 by screws 75 inserted through the flange 74a. A top end portion of punch 226 projects above the top end of sleeve 74 and carries a pair of laterally spaced rollers 76 by which punch 226 is movable between its retracted

S

and advanced positions.

Mounted above central base plate 66, there is a horizontally disposed, 15 intermediate plate 77. Four posts 78 secured to plate 66 and plate 77 provide support for the latter. Each post 78 is of hexagonal section but has a threaded lower end which projects through plate 66 and is secured by a nut 79. Each post 78 also has a threaded upper end which projects through a hole in plate 77 and the latter is secured by an internally thread hexagonal section sleeve S. 20 Except at a section of the linear run along which strip 224 extends, where plate 77 is cut away to define a rectangular opening 81, plate 77 has an outer periphery 82 which is substantially parallel to the loops to L, L' The dimensions of plate 77 and the length of posts 78 are such that, as each set S moves around the loops L, the upper end of each punch 226 moves around periphery 82, with the laterally inner one of is rollers 76 riding of the upper surface of plate 77.

This arrangement serves to hold each punch 226 in its retracted position, except when, its inner roller 76 is moving across opening 81 in plate 77. As each inner roller 76 moves beyond opening 81, it again passes ono the upper surface of plate 77, and that surface has a ramp portion 77a which engages each roller 76 in turn, to lift it and its punch 226 away from the advanced position. Similarly the upper surface of plate 77 has a ramp portion 776 at the approach side to opening

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I I-- 16 81, to enable each punch 226 in turn to commence movement to its advanced position.

On sleeves 63, there is mounted a horizontally disposed, rectangular upper plate 83. Inserted through plate 83 to retain it in position, there is a respective bolt 83a engaged in a threaded upper end of each sleeve 80. Mounted on plate 83, there is secured a rectangular frame 84 which has a respective one of opposed sides extending substantially parallel to and above each linear run of loops L, The one of those sides of frame 84 which is above the run along which strip 224 extends comprises a parallel pair of laterally adjacent side plates 84a, 84a', while the other one comprises a single side plate 84b. Each of those i'o. side plates is joined by respective end plates 84c, which comprise the other pair V of parallel sides of frame 84 and are joined to plate 83.

An adjustable cam bar 85 is mounted on plates 84a, 84a' The cam bar S extends along, but below side plates 84a, 84a'. Relative to the feed direction 15 shown by arrow A, for strip 224 passing through installation 210, an upstream end 0 of cam bar 85 is pivotally connected by a pin 86 through the lower end of a pair of brackets 87. The upper end of each bracket 87 is secured to a respective one of side plates 84a, 84a'. At its downstream end, cam bar 85 is pivotally connected by a pin 86a through the lower end of a pair of brackets 87a, while the upper end S. 20 of each bracket 87a is journalled on an eccentric sleeve 88 which extends through plates 84a, 84a' of frame 84. Axially in line with sleeve 88, there is a sleeve 88a in, and projecting laterally outwardly from, plate 84b of frame 84. A shaft 89 extends through and is secured in each of eccentric sleeve 88, and sleeve 88a and, at an end of shaft 89 which projects beyond sleeve 88a, there is secured one end of a lever arm 90. A handle 90a is secured to the other end of arm 90. The arrangement is such that with arm 90 in the position in solid lines in Figure 6, a lower cam surface 85a of cam bar 85 is inclined downwardly in the downstream direction from its end connected to pin 86 to its end secured to pin 86a, and bar 85 is in an active position as shown in Figure 6. However, arm 90 is rotatable about the axis of shaft 89 to the position partially shown by broken outline in Figure 6, in which the broken line semi-circle depicts resultant transversal of handle 90a. With such rotation of arm 90 aind hence, of shaft 89,

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I eccentric sleeve 88 acts to raise the downstream end of cam bar 85 and thereby position bar 85 in an inactive position in which its cam surface 85a is substantially horizontal.

The arrangement of installation 210 is such that each tool set S is able to move around its loops L, L

I

in an anti-clockwise direction as viewed in Figures 7 and 8. Throughout this movement, the rollers 65 of each set S ride on plate 64, while the roller 68 of each set S rides on plate 66 and the roller 62 of each pin between successive sets S rides on the periphery of plate 66. As each successive pair of sets S move along each run of loops L, the roller 62 of the pin 60 therebetween also rides along the surface of a respective one of guide bars 69.

Throughout a major part of the movement of each tool sets S around loops L, the laterally inner one of the rollers 76 of its punch 226 rides on plate 77.

This holds the punch 226 in its retracted position in which it is maintained, except 15 over that part of movement of each set around loops L' in which the inner roller 76 moves onto and beyond ramp 77b of plate 77 and until it moves onto and beyond ramp 77a of plate 77. During the latter part of movement of each set S, each of the rollers 76 of its punch 226 are engaged by the cam surface 85a of cam bar 85, assuming that bar 85 is in its active position.

20 The cam bar 85 is positioned and has a laterR; width such that its cam surface 85a can engage both rollers 76 of a punch 226. With cam bar 85 in its active position, its cam surface 85a engages the rollers 76 from the stage at which they are on or just beyond ramp 77b. The length of cam bar 85 is such that its cam surface 85a continues to engage the rollers 76 until just before the rollers 76 engage and ride up ramp 77a. That is, cam surface 85a engages the rollers 76 substantially throughout their traversal of opening 81 in plate 77. The inclination of cam surface 85a in the downstream direction is such that during such traversal of opening 81, each of successive pairs of rollers 76 and their punch 226 are forced downwardly such that the punch 226 is moved from its retracted position to its advanced position. With punch 226 in its advanced position, its lower portion 226a projects through its insert 73 and into the die tool 220 of its set S. The rollers then move beyond the downstream end of the cam

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18 surface 85a and are able to ride up the ramp 77a to return their punch 226 to its retracted position.

For configuring sheet material comprising strip 224, cam bar 85 initially is moved to its inactive position, by rotation of arm 90. Strip 224 then is advanced through installation 210 in direction A, after lifting the pair of rollers 76 and their punch 226 for each set S aligned with the opening 81 of plate 77. This lifting can be performed manually, or by a bar which is associated with cam bar 85 and which is raised or lowered with the latter. With the strip 224 so advanced, its leading end is engaged in apparatus by which it is able to be continuously drawn through installation 210. Cam bar 85 then is returned to its active position, again by rotation of arm In returning bar 85 to its active position, its cam surface 85a engages with the pair of rollers 76 of the punch 226 of each set S aligned with the opening 81.

This engagement forces at least one of those punches 226 to its advanced i. 15 position, with piercing of strip 224, and forces the or each other of those punches .226 towards that position. The strip 224 then can be drawn through installation 210 in direction A, with it being pierced by the punch 226 of successive sets S.

The arrangement is such that at least one punch 226 is sufficiently engaged with strip 224, during traversal of gap 81 of plate 77 by successive sets S, such that S 20 sets S are caused to move around loops L, Ll in response to the drawing of strip 0* *o 224.

In the illustrated embodiments, successive punches are driven so as to pierce holes of a desired shape into sheet material. In those embodiments, the spacing between successive regions of the sheet material at which resultant configuring is achieved is substantially uniform. However, it readily will be apparent that, while desirable for most applications, this need not be the case.

Thus, for example, there can be variation in the spacing between successive tool sets. Moreover, it will be apparent that the form of successive punches can be the same or different. Additionally, as previously indicated, the configuring can for example be in the nature of embossing, rather than by piercing, while in either case, it can be inter:, nediate of the edges or at an edge of the sheet material.

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19 For most applications, there is no need to drive the tool sets around their loops by a direct power drive acting directly on the tool sets, as the engagement between the tool sets and the travelling sheet material is able to drive the loop sets automatically at the same linear speed as the sheet material. This obviates the need for complex timing arrangements to synchronise the speed of the tool sets with the sheet material. Also, in most cases, the arrangement can be able to reverse, such as automatically, when the sheet material is reversed. This is desirable as the configuring will normally be only one of a number of successive operations performed on the sheet material, for example as part of a roll forming line, and it is sometimes necessary to be able to reverse the line to clear blockages. However, at least in the case of the embodiment of Figures 5 to 11, it will be appreciated that reversal necessitates movement of cam bar 85 to its inactive position and means for maintaining punches 226, retracted during movement from ramp 77a to ramp 77b.

15 Further potential advantages of the arrangement of the invention are quietness, compared to the violent pneumatic or hydraulic actuation of a flying punch, and the fact that the punch and die shape correspond to the pattern to be punched.

The arrangement of Figures 1 and 2 can be further simplified by having the S. 20 tool sets S travel in a single, linked path parallel to the plane of the sheet material, such as shown in Figures 3 and 4. In this arrangement, the loops L, L' are located beside the edge of the sheet material. Each punch carrier 128 is coupled to its corresponding die 120 so that the tool sets S travel as a unit around logos L, Ll and overlap the edge of the sheet material 124. The tool set S is cantilevered so that the punch 126 and die 128 fit either side of the sheet material.

The horizontal arrangement of Figures 3 and 4, as well as that of Figures to 11, allows direct coupling of the tools of each set and, because only one loop path is needed, only two sets of guide wheels are needed in the arrangement of Figures 3 and 4.

While the invention is particularly well suited for impressing sheet material, it can have other applications. For example, the arrangement can be used for

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I -I embossing or piercing extruded materials, or the tools of each set S can be brought together to form a mould.

While particular embodiments of this invention have been described, it will be evident to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof.

The present embodiments described are therefore to be considered as illustrative and not restrictive, and all modifications which would be obvious to those skilled in the art are therefore intended to be embraced by the invention as defined by the following claims.

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Claims (27)

1. Apparatus for configuring of sheet material, comprising two series of tools in which the tools of each series are interconnected in an endless loop and movable around guide means; wherein the arrangement is such that, as each tool of each series moves around the respective loop, it moves along a substantially linear path length or run which is substantially parallel with and adjacent to a plane along which the sheet material is movable, and such that at least during movement along the linear path, the tools of each series are adjacent to a 10 respective one of opposite surfaces of the sheet material, with each tool of one I oo series in register with a tool of the other series to provide a co-operable set of V. tools operable to provide configuring of a region of the sheet material therebetween, whereby during movement of the tools along the linear path, successive sets of tools are operable to provide configuring of the sheet material at successive regions of the sheet material; and wherein one tool of each set includes a punch device having apunch and a housing or punch carrier in which the punch is moveable, with the other tool of each set comprising a reaction ***member.

2. Apparatus according to claim 1, wherein each tool of one series comprises S 20 a punch device, and each tool of the other series comprises a reaction member.

3. Apparatus according to claim 1, wherein each of some tools of each series comprises a punch device, with the others of each series comprising reaction members, subject to one tool of each set being a punch device and other being a reaction member.

4. Apparatus according to any one of claims 1 to 3, wherein there is an equal number of tools in each series. Apparatus according to any one of claims 1 to 4, wherein each reaction member comprises a die which is co-operable with the punch of its set,

6. Apparatus according to claim 5, wherein each die defines a recess with which the punch of its set is co-operable to form a depression or dimple of a required shape in a region of the surface of the sheet material engaged by the punch. RNC:SPECI.DOC ~PC sY 22

7. Apparatus according to claim 5, wherein each die defines a depression or opening with which the punch of its set is cc-operable to sever the sheet material at the region therebetween such as to displace the region at least partially from the sheet material. Apparatus according to any one of claims 1 to 5, wherein each reaction member comprises a reaction block which defines a substantially planar surface by which it engages a surface of the sheet material such as to resist the action of the punch of its set such that the punch acts to deform a region of the sheet material at a surface it engages. 10 9. Apparatus accordirg to any one of claims 1 to 8, wherein each tool of each i set in part comprises a punch and a reaction tool such as to provide a dimple or depression in each surface of the sheet material which is adjacent to a raised formation at each said surface. Apparatus according to any one of claim I to 9, wherein the loops in which 15 the tools of each series are movable are substantially parallel.

11. Apparatus according to claim 10, wherein each loop is substantially perpendicular to a plane along which the sheet material is movable, and the tools of each set are co-operable in a direction which is substantially perpendicular to said plane. S 20 12. Apparatus according to claim 10, wherein each loop is substantially parallel to a plane in which the sheet material is movable, and the tools of each set are co-operable in a direction which is substantially perpendicular to said plane.

13. Apparatus according to any one of claims 1 to 12, wherein the tools of at least one series are movable around their loop by the action of suitable drive means, and movement of the sheet material is in response to its engagement by and movement of the tools of successive sets.

14. Apparatus according to any one of claims 1 to 12, wherein after achieving engagement of the sheet material by the tools of at least one set, movement of the tools of each series around their loop is in response to movement of the sheet material along its path of movement. Apparatus according to claim 14, including means by which the sheet material is able to be drawn through the two series of tools. RNC:SPECI.DOC II 23

16. Apparatus according to claim 12, or to any one of claims 13 to 15, when appended to claim 12, wherein the tools of each set are secured in assembly.

17. Apparatus according to any one of claims I to 15, wherein the tools for each series are interconnected by being secured to a common endless chain or belt for each series, with the chain or belt passing around a common pair of rotatable wheels or pulleys with which it drivingly engages.

18. Apparatus arcording to any one of claims 1 to 15, wherein the tools of each series are interconnected by being secured to a respective endless chain, or pivotally interconnected series of links, which passes around a respective pair of pulleys or wheels. i' o

19. Apparatus according to any one of claims 1 to 15, wherein each of successive tools of each series are interconnected by a respective length of chain or a respective link. Apparatus according to claim 16, wherein successive sets are directly 15 pivotally interconnected to provide the respective loops.

21. Apparatus according to claim 20, wherein successive sets of tools are pivotally interconnected adjacent .o an inner periphery of the loops by a respective pivot pin which has its longitudinal extent substantially perpendicular to the plane along which the sheet material is movable. S 20 22. Apparatus according to claim 21, wherein each pivot pin carries at least *0o 0 o one roller which is constrained by a track which follows a common form of the loops and which defines at least part of the guide means around which the loops are movable.

23. Apparatus according to any one of claims 1 to 22, wherein co-operation between the tools of each set to provide configuring of the sheet material is provided by a cam action.

24. Apparatus according to claim 23, including cam means which engages the punch of each set of tools so as to move the punch to provide the configuring. Apparatus according to claim 24 as appended to claim 2, wherein the cam means comprises a cam track which is engaged by the punch of successive tools of the one series as they are moved along the linear path length, to progressively move each punch in turn from a retracted position to an advanced position, in the RNC:SPECI.DOC I 24 course of movement along a part of that path length for which the tools of each set are to engage the sheet material

26. Apparatus according to claim 24 as appended to ciaimn 3, wherein the cam means comprises a respective cam track for each series which is engaged by each punch of its series as they are moved along the linear path, to progressively move each punch of its series in turn from a retracted position to an advanced position, in the course of movement aiong a part of that path length for which the tools of each set are to engage the sheet material.

27. Apparatus according to any one of claims 1 to 26, wherein at least for each 10 tool including a punch is supported, at least during movement along the linear i o length of its loop, so as to position its housing or punch carrier in a constant relationship to a plane along with the sheet material is movable.

28. Apparatus according to claim 27, wherein each housing or punch carrier is guided by the guide means in such constant relationship. 15 29. Apparatus according to claim 28, wherein the guide means comprises a guide member such as a plate on which at least one roller mounted on the housing or punch carrier is engaged. Apparatus according to any one of claims 27 to 29, wherein the punch of each punch device engages a guide device, such as a plate or track, by at least S 20 one roller mounted on the punch, so as to cause movement of the punch from its advanced configuring position when the device is at a downstream part of the linear path.

31. Apparatus according to claim 30, wherein the guide device is continuous around a major part of the or each loop and shaped along the linear path to enable each punch to move to its advanced position during movement of its punch device along an upstream part of that linear path.

32. Apparatus according to claim 31, wherein the guide device is discontinuous along the linear path, to enable movement of each punch to its advanced position, in response to cam means.

33. A method for configuring of sheet material, wherein said sheet material disposed between two series of tools in which the tools of each series are interconnected in an endless loop and movable around guide means; such that, RNC:SPECI.DOC as each tool of each series moves around the respective loop, it moves along a substantially linear path length or run which is substantially parallel with and adjacent to a plane along which the sheet material is disposed, and such that at least during movement along the linear path, the tools of each series are adjacent to a respective one of opposite surfaces of the sheet material, with each tool of one series in register with a tool of the other series to provide a co-operable set of tools opetable to provide configuring of a region of the sheet material therebetween; wherein during movement of the tools along the linear path, the tools of successive sets of tools engage the sheet material and operate to provide o 10 configuring of the sheet material at successive regions of the sheet material; wherein one tool of each set includes a punch device having a punch and a housing or puncn carrier in which the punch is moveable, with the other tool of each set comprising a reaction member; and wherein said successive sets of a. a.° a a tools engaging the sheet material provide a driving engagement therebetween, 15 34. The method according to claim 33, wherein the engagement between the successive sets of tools and the sheet material provides configuring of the sheet material by piercing said material at regions therealong.

35. The method according to claim 33, wherein the engagement between the successive sets of tools and the sheet material provides configuring of the sheet a 20 material by em'Jossing said sheet material at intervals therealong. a°*36. The method according to any one of claims 33 to 35, wherein said sheet material is drawn along said plane and movement of the tools of each series around said loops is by the driving engagement between said successive sets of tools and the sheet material.

37. The method according to any one of claims 33 to 36, wherein said two series of tools form part of apparatus according to any one of claimrns 1 to 33.

38. A method according to claim 33, substantially as herein described with reference to any one of the embodiments of the accompanying drawings.

39. Configured sheet material when produced by the method of any one of claims 33 to 38. An article formed of sheet material according to claim 39. RNC:SPECI.DOC Y I- 26

41. Apparatus according to claim 1, substantially as herein described with reference to any one of the embodiments of the accompanying drawings. DATED: 30 August 1995 fees .00. so 0 STRAMJ CORPORATION LIMITED by PHILLIPS ORMONDE FITZPATRICK RNC:SPE'IDOC ABSTRACT The apparatus and a method for configuring of sheet material comprises or requires use of two series of tools in which the tools of each series are interconnected in an endless loop and movable around guide means. The arrangement is such that, as each tool of each series moves around the respective loop, it moves along a substantially linear path length or run which is substantially parallel with and adjacent to a plane along which the sheet material is movable. At least during movement along the linear path, the tools of each series are adjacent to a respective one of opposite surfaces of the sheet material, ,1 with each tool of one series in register with a tool of the other series to provide a co-operable set of tools operable to provide configuring of a region of the sheet material therebetween. During movement of the tools along the linear path, successive sets of tools are operable to provide configuring of the sheet material at successive regions of the sheet material. One tool of each set includes a 15 punch device having a punch and a housing or punch carrier in which the punch is moveable, with the other tool of each set comprising a reaction member. S. a a. a a RNC:SPECI.DOC I