GB2077173A - Improvements in and relating to punching machines - Google Patents

Improvements in and relating to punching machines Download PDF

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Publication number
GB2077173A
GB2077173A GB8008150A GB8008150A GB2077173A GB 2077173 A GB2077173 A GB 2077173A GB 8008150 A GB8008150 A GB 8008150A GB 8008150 A GB8008150 A GB 8008150A GB 2077173 A GB2077173 A GB 2077173A
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GB
United Kingdom
Prior art keywords
holder
punch
frame
die
assembly
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.)
Withdrawn
Application number
GB8008150A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PRODUCTO MACHINE TOOLS EUROP L
Original Assignee
PRODUCTO MACHINE TOOLS EUROP L
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PRODUCTO MACHINE TOOLS EUROP L filed Critical PRODUCTO MACHINE TOOLS EUROP L
Priority to GB8008150A priority Critical patent/GB2077173A/en
Publication of GB2077173A publication Critical patent/GB2077173A/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/14Particular arrangements for handling and holding in place complete dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/04Movable or exchangeable mountings for tools

Abstract

The punching machine comprises a frame (1) having generally parallel upper and lower generally horizontally extending limbs (2, 3) forming a generally C-shaped frame. Adjacent the free ends, the limbs (2, 3) carry respectively a holder (4) for a punch assembly (5) and a holder (6) for a die assembly (7) which in operative position are axially aligned. At least the punch assembly holder (4) is linearly movable, preferably in the direction of extent of the upper limb (2) outwardly, to allow access to the punch assembly therein. The punch assembly holder (4) may also be movable inwardly of the limb to enable access to a fixed die assembly (7) in the die assembly holder (6). Alternatively the die assembly holder (6) may also be linearly movable to provide access to a die assembly therein. Each of the holders (4, 6) may be adapted to receive two or more punch and die assemblies respectively, each of which can be moved into the operative position beneath a ram (8). <IMAGE>

Description

SPECIFICATION Improvements in and relating to punching machines The present invention relates to improvements in punching machines and particularly but not exclusively single hole punching machines.
Single hole punching machines comprising a single die holder and a single punch holder for receiving cooperating punch and die assemblies are generally designed so that the punch and die assemblies can be removed and replaced by other assemblies which may be the same or for producing different holes.
To allow for removal of the assemblies, it is generally necessary for one of the holders to be first removed from its operative position to enable access to the assembly received therein and to the assembly left in the machine. Because of the requirement for exact registration within close tolerences of the punch and die assemblies when in operation, the removable holder has to be arranged so that it can be replaced in exactly the same position.
Heretofor this has been obtained by mounting the punch assembly holder for pivotal movement between an operative position and an inoperative position, in which the punch assembly can be removed. Generally the punch assembly holder is mounted on two pins arranged with their axes parallel and parallel to the operative axis of the punch and die assemblies, one of the pins being disengageable so that the punch holder can rotate about the other pin. However with this arrangement the pin providing the axis of pivot can become distorted leading to misalignment of the punch and die assemblies.
According to the present invention there is provided a punching machine comprising a frame supporting a punch holder and a die holder respectively for receiving punch and die assemblies, wherein the punch holder is mounted in the frame for linear movement between an operative position in which it is aligned with the die holder and an inoperative position in which a punch assembly mounted therein is accessible for removal.
Advantageously the frame comprises upper and lower parallel limbs connected to create a generally C-shaped frame, the punch holder being mounted adjacent the free end of the upper limb and the die holder being mounted adjacent the free end of the lower limb, the punch holder being movable in the direction of extent of the upper limb.
Preferably the punch holder is slidable outwardly of the upper limb to enable access to a punch assembly carried thereby and inwardly of the upper limb to enable access to a die assembly carried by the die holder.
The upper limb of the frame may comprise two generally vertical side members which are connected together to define a downwardly opening generally U-shaped channel in which the punch holder is received, guide means being provided on the facing surfaces of the side members on which the punch holder is guided in its movement between its operative and inoperative positions.
The guide means may comprise rails along which the punch holder slides.
Locking means may be provided which are operative to lock the punch holder in its operative position and the locking means may comprise means for locking the punch holder against movement both in the direction of movement of the punch holder between its operative and inoperative positions and against movement perpendicularly thereof.
Such locking means may comprise a pin mounted in the frame which is received in a lateral hole in the holder to maintain the position of a punch holder in the direction of movement thereof and which bears against the punch holder to force it against one of the frame side members which serves to define a registration surface for alignment of the punch and die assemblies.
The die assembly holder may be fixed to the frame, where the punch assembly holder is movable both to allow access to a punch assembly therein and to a die assembly in the die assembly holder, or may be linearly movable in the frame to allow access to a die assembly therein.
The invention will be more fully understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings.
In the drawings:~ Figure 1 is a side view of an embodiment of a punching machine according to the present invention; Figure 2 is a plan view of the machine of Fig. 1 showing ancillary equipment which may be provided; Figure 3 is a front elevation of the machine of Fig. 2; Figures 4 and 5 are part sectional views taken on the line IV-V of Fig. 1 and showing the punch assembly holder and die assembly holder in the frame of the machine of Fig. 1; Figure 6 is a scrap view showing a part of Fig. 4 in an alternative position; and Figure 7 is a vertical section on the line VII-VII of Figs. 4 and 5.
The punching machines shown in Fig. 1 of the drawings comprises a frame 1 having generally parallel upper and lower generally horizontally extending limbs 2,3 connected together to form a generally C-shaped frame.
Adjacent their free ends, the limbs 2,3 carry respectively a holder 4 for a punch assembly 5 and a holder 6 for a die assembly 7 which in their operative positions are axially aligned with a vertical axis. The upper limb 2 of the frame also carries a ram 8 axially aligned with the punch and die assemblies. In operation, a sheet to be punched is placed between the limbs of the frame and between the punch and die assemblies 5,7 and the ram is operated to move the punch against the die.
The frame 1 may, as shown in Figs. 2 and 3, be associated with a table 9, for example arranged with the frame 1 extending along one edge of the table 9, the table 9 being provided with means enabling duplication of a template by the machine. The duplication means comprises rails 10 extending parallel to the longitudinal direction of the limbs 2,3 and on which a carriage 11 is mounted for movement over a template mounted on the table.
An arm 12 is mounted on the carriage and provided with grippers 13 for gripping a workpiece and with a stylus 14 to be located in register with a hole in the template to be punched in the workpiece, the stylus 14 conveniently being associated with a handle 15 provided with an operating device for causing operation of the ram.
The machine may also be provided with an arm 16 extending from the other side of the frame 1 and provided with adjustable stops 17, the arm 16 being mounted for movement in the longitudinal direction of the limbs of the frame.
As shown particularly with reference to Figs. 4 and 5, the frame 1 comprises two lateral C-shaped plates 1 8,1 9 which are fixed together, e.g. by bolting or welding, with the interposition of transverse members. At the free end of the upper limb 2, the plates 1 8,1 9 are interconnected by the cylinder of ram 8 to which the plates are bolted and which provides therewith a downwardly opening channel extending in the direction of length of the upper limb and in which the punch assembly holder 4 is received. The holder 4 is mounted for linear movement in the direction of length of the upper limb between an operative position in alignment with the ram 8 and inoperative positions in which access is provided to a punch assembly therein and in which access is provided to a die assembly in the die assembly holder 6.
As shown, the punch assembly holder 4 is mounted for lateral movement on guide rails 20 fixed to the facing surface of the plates 18,1 9. The holder 4 is provided with lateral channels 21 in which the rails are received. In the present embodiment, the rails extend rearwardly of the operative position of the holder so that the holder can be pushed rearwardly of the upper limb to expose the die assembly holder, and can also be pulled forwardly to expose the punch assembly therein.
The punch assembly holder 4 may have a suitable form depending on the type of punch assembly with which it is to be used. The punch assembly shown in Fig. 7 is similar to that described in copending Patent Application 7921 634 but it may have other, conventional, forms. As shown, the holder 4 carries on apertured plate 22 which is mounted by springs 23 on the holder and acts to return the punch assembly to its initial position.
In the operative position of the punch assembly holder, the holder must be fixed against movement in direction of extent of the rails and against movement transversely thereto, and must have a constant position to ensure accurate registration with the die assembly, after replacement of a punch assembly. To this end, in its operative position, the holder 4 is caused to laterally abut a reference surface by a locking member which bears on the holder. Conveniently this locking member also locates the holder positively against movement in the direction of extent of the rails. As shown a pin 24- is mounted in an opening 25 in frame plate 19. The pin is provided with a frusto-conical end 26 which is, in the operative position of the holder 4, received in a correspondingly shaped recess 27 in a bushing 28 provided in a bore 29 in the holder.As the pin is driven into the holder, the frusto-conical end 26 engages the recess 27 to center the holder accurately in the direction of movement of the holder and at the same time the pin bears against the walls of the recess 27 so that the holder 4 is pushed firmly against the other frame plate 18 which provides the reference surface. As shown, the pin is operated by a manually operable toggle linkage 30 with an overcenter action, against the bias of a spring 31 which is operative to withdraw the pin from the holder when the linkage 30 is moved to its inoperative position, as shown in Fig. 6.
The toggle linkage 30 acts on the pin 24 through an adjustable member 32, which is adjustable to vary the force exerted on the pin.
The holder 4 is provided with a handle 33 for facilitating movement thereof and with a protective transparent front plate 34. Detents (not shown) are provided to facilitate location and maintenance of the holder in its inoperative positions both forwardly and rearwardly of its operative position. The detents may take the form of spring loaded balls mounted in the rails and engageable in spherical recesses provided in the holder.
Since, in this embodiment, the punch assembly holder is movable to allow access both to a punch assembly mounted therein and to the die assembly, the die assembly holder 6 can be fixed in the frame. As shown the die assembly is fixed to a member 35 bridging the lower limbs of the frame plates 18, 19 and to which the frame plates are bolted. A die lifting mechanism 36 may be provided for assisting removal of the die assembly, the mechanism comprising a tubular member 37 which is slidable upwardly to abut the lower end of the die assembly and lift it out of the holder, the member 37 being moved by up SPECIFICATION Improvements in and relating to punching machines The present invention relates to improvements in punching machines and particularly but not exclusively single hole punching machines.
Single hole punching machines comprising a single die holder and a single punch holder for receiving cooperating punch and die assemblies are generally designed so that the punch and die assemblies can be removed and replaced by other assemblies which may be the same or for producing different holes.
To allow for removal of the assemblies, it is generally necessary for one of the holders to be first removed from its operative position to enable access to the assembly received therein and to the assembly left in the machine. Because of the requirement for exact registration within close tolerences of the punch and die assemblies when in operation, the removable holder has to be arranged so that it can be replaced in exactly the same position.
Heretofor this has been obtained by mounting the punch assembly holder for pivotal movement between an operative position and an inoperative position, in which the punch assembly can be removed. Generally the punch assembly holder is mounted on two pins arranged with their axes parallel and parallel to the operative axis of the punch and die assemblies, one of the pins being disengageable so that the punch holder can rotate about the other pin. However with this arrangement the pin providing the axis of pivot can become distorted leading to misalignment of the punch and die assemblies.
According to the present invention there is provided a punching machine comprising a frame supporting a punch holder and a die holder respectively for receiving punch and die assemblies, wherein the punch holder is mounted in the frame for linear movement between an operative position in which it is aligned with the die holder and an inoperative position in which a punch assembly mounted therein is accessible for removal.
Advantageously the frame comprises upper and lower parallel limbs connected to create a generally C-shaped frame, the punch holder being mounted adjacent the free end of the upper limb and the die holder being mounted adjacent the free end of the lower limb, the punch holder being movable in the direction of extent of the upper limb.
Preferably the punch holder is slidable outwardly of the upper limb to enable access to a punch assembly carried thereby and inwardly of the upper limb to enable access to a die assembly carried by the die holder.
The upper limb of the frame may comprise two generally vertical side members which are connected together to define a downwardly opening generally U-shaped channel in which the punch holder is received, guide means being provided on the facing surfaces of the side members on which the punch holder is guided in its movement between its operative and inoperative positions.
The guide means may comprise rails along which the punch holder slides.
Locking means may be provided which are operative to lock the punch holder in its operative position and the locking means may comprise means for locking the punch holder against movement both in the direction of movement of the punch holder between its operative and inoperative positions and against movement perpendicularly thereof.
Such locking means may comprise a pin mounted in the frame which is received in a lateral hole in the holder to maintain the position of a punch holder in the direction of movement thereof and which bears against the punch holder to force it against one of the frame side members which serves to define a registration surface for alignment of the punch and die assemblies.
The die assembly holder may be fixed to the frame, where the punch assembly holder is movable both to allow access to a punch assembly therein and to a die assembly in the die assembly holder, or may be linearly movable in the frame to allow access to a die assembly therein.
The invention will be more fully understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings.
In the drawings:~ Figure 1 is a side view of an embodiment of a punching machine according to the present invention; Figure 2 is a plan view of the machine of Fig. 1 showing ancillary equipment which may be provided; Figure 3 is a front elevation of the machine of Fig. 2; Figures 4 and 5 are part sectional views taken on the line IV-V of Fig. 1 and showing the punch assembly holder and die assembly holder in the frame of the machine of Fig. 1; Figure 6 is a scrap view showing a part of Fig. 4 in an alternative position; and Figure 7 is a vertical section on the line VII-VII of Figs. 4 and 5.
The punching machines shown in Fig. 1 of the drawings comprises a frame 1 having generally parallel upper and lower generally horizontally extending limbs 2,3 connected together to form a generally C-shaped frame.
Adjacent their free ends, the limbs 2,3 carry respectively a holder 4 for a punch assembly 5 and a holder 6 for a die assembly 7 which in their operative positions are axially aligned with a vertical axis. The upper limb 2 of the frame also carries a ram 8 axially aligned with the punch and die assemblies. In operation, a sheet to be punched is placed between the limbs of the frame and between the punch and die assemblies 5,7 and the ram is operated to move the punch against the die.
The frame 1 may, as shown in Figs. 2 and 3, be associated with a table 9, for example arranged with the frame 1 extending along one edge of the table 9, the table 9 being provided with means enabling duplication of a template by the machine. The duplication means comprises rails 10 extending parallel to the longitudinal direction of the limbs 2,3 and on which a carriage 11 is mounted for movement over a template mounted on the table.
An arm 12 is mounted on the carriage and provided with grippers 13 for gripping a workpiece and with a stylus 14 to be located in register with a hole in the template to be punched in the workpiece, the stylus 14 conveniently being associated with a handle 15 provided with an operating device for causing operation of the ram.
The machine may also be provided with an arm 16 extending from the other side of the frame 1 and provided with adjustable stops 17, the arm 16 being mounted for movement in the longitudinal direction of the limbs of the frame.
As shown particularly with reference to Figs. 4 and 5, the frame 1 comprises two lateral C-shaped plates 18,19 which are fixed together, e.g. by bolting or welding, with the interposition of transverse members. At the free end of the upper limb 2, the plates 1 8,1 9 are interconnected by the cylinder of ram 8 to which the plates are bolted and which provides therewith a downwardly opening channel extending in the direction of length of the upper limb and in which the punch assembly holder 4 is received. The holder 4 is mounted for linear movement in the direction of length of the upper limb between an operative position in alignment with the ram 8 and inoperative positions in which access is provided to a punch assembly therein and in which access is provided to a die assembly in the die assembly holder 6.
As shown, the punch assembly holder 4 is mounted for lateral movement on guide rails 20 fixed to the facing surface of the plates 18,1 9. The holder 4 is provided with lateral channels 21 in which the rails are received. In the present embodiment, the rails extend rearwardly of the operative position of the holder so that the holder can be pushed rearwardly of the upper limb to expose the die assembly holder, and can also be pulled forwardly to expose the punch assembly therein.
The punch assembly holder 4 may have a suitable form depending on the type of punch assembly with which it is to be used. The punch assembly shown in Fig. 7 is similar to that described in copending Patent Application 7921634 but it may have other, conventional, forms. As shown, the holder 4 carries on apertured plate 22 which is mounted by springs 23 on the holder and acts to return the punch assembly to its initial position.
In the operative position of the punch assembly holder, the holder must be fixed against movement in direction of extent of the rails and against movement transversely thereto, and must have a constant position to ensure accurate registration with the die assembly, after replacement of a punch assembly. To this end, in its operative position, the holder 4 is caused to laterally abut a reference surface by a locking member which bears on the holder. Conveniently this locking member also locates the holder positively against movement in the direction of extent of the rails. As shown a pin 24 is mounted in an opening 25 in frame plate 19. The pin is provided with a frusto-conical end 26 which is, in the operative position of the holder 4, received in a correspondingly shaped recess 27 in a bushing 28 provided in a bore 29 in the holder.As the pin is driven into the holder, the frusto-conical end 26 engages the recess 27 to center the holder accurately in the direction of movement of the holder and at the same time the pin bears against the walls of the recess 27 so that the holder 4 is pushed firmly against the other frame plate 18 which provides the reference surface. As shown, the pin is operated by a manually operable toggle linkage 30 with an overcenter action, against the bias of a spring 31 which is operative to withdraw the pin from the holder when the linkage 30 is moved to its inoperative position, as shown in Fig. 6.
The toggle linkage 30 acts on the pin 24 through an adjustable member 32, which is adjustable to vary the force exerted on the pin.
The holder 4 is provided with a handle 33 for facilitating movement thereof and with a protective transparent front plate 34. Detents (not shown) are provided to facilitate location and maintenance of the holder in its inoperative positions both forwardly and rearwardly of its operative position. The detents may take the form of spring loaded balls mounted in the rails and engageable in spherical recesses provided in the holder.
Since, in this embodiment, the punch assembly holder is movable to allow access both to a punch assembly mounted therein and to the die assembly, the die assembly holder 6 can be fixed in the frame. As shown the die assembly is fixed to a member 35 bridging the lower limbs of the frame plates 18, 19 and to which the frame plates are bolted. A die lifting mechanism 36 may be provided for assisting removal of the die assembly, the mechanism comprising a tubular member 37 which is slidable upwardly to abut the lower end of the die assembly and lift it out of the holder, the member 37 being moved by up ward pivotal movement of a lever 38 mounted on the member 35 for pivotal movement about a horizontal axis.
It will be appreciated that the above described machine may be modified in a number of different ways. For example the punch holder can be mounted on the frame for linear movement in the direction of length of the upper frame limb in a different way, locking of the holder in its operative position may also be obtained in other ways. Additionally while, as described, the die assembly holder is fixed in the frame, the holder may be mounted for linear movement in the direction of length of the lower limb of the frame in a manner similar to the punch assembly holder and may be provided with a similar locking mechanism for locking it in its operative position.
While the invention has been described in terms of a single hole punching machine, it will be appreciated that the punch and die assembly holders may each be adapted to receive more than one punch and die assembly respectively and may be linearly movable not only to permit access to the punch and die assemblies received therein for removal purposes but also to locate different ones of the punch and die assemblies in the operative position in alignment with the ram. Additionally, in a more sophisticated version of the above described machine the or each movable holder may be associated with drive means for moving the holder and drive means may also be provided for operating the locking means.

Claims (11)

1. A punching machine comprising a frame supporting a punch holder and a die holder respectively for receiving punch and die assemblies, wherein the punch holder is mounted in the frame for linear movement between an operative position in which it is aligned with the die holder and an inoperative position in which a punch assembly mounted therein is accessible for removal.
2. A punching machine according to Claim 1, wherein the frame comprises upper and lower generally parallel limbs connected to create a generally C-shaped frame, the punch holder being mounted adjacent the free end of the upper limb and the die holder being mounted adjacent the free end of the lower limb, the punch holder being movable linearly in the direction of extent of the upper limb.
3. A punching machine according to Claim 2, wherein the frame and punch holder are adapted such that the punch holder is movable outwardly of the upper limb to enable access to a punch assembly carried thereby.
4. A punching machine according to Claim 3, wherein the die assembly holder is fixed relative to the frame and the frame and punch assembly holder are adapted such that the punch assembly holder is movable inwardly of the upper limb of the frame to enable access to a die assembly carried by the die assembly holder.
5. A punching machine according to Claim 3, wherein the die assembly holder is mounted in the lower limb of the frame for linear movement between an operative position and an inoperative position in which a die assembly mounted therein is accessible for removal.
6. A punching machine according to any one of Claims 2 to 5, wherein the upper limb of the frame comprises two generally vertical side members which are connected together to define a downwardly opening generally Ushaped channel in which the punch holder is received, guide means being provided on the facing surfaces of the side members for guiding the punch holder in its movement between its operative and inoperative positions.
7. A punching machine according to Claim 6, wherein the guide means comprise rails along which the punch holder is slidable.
8. A punching machine according to any one of the preceeding claims, comprising locking means operative to lock the punch holder in its operative position, the locking means comprising means for locking the punch holder against movement in the direction of movement of the punch holder between its operative and inoperative positions and against movement perpendicular thereto.
9. A punching machine according to Claim 8, wherein the locking means comprise a pin mounted in the frame and which is receivable in a lateral aperture in the punch holder so as to maintain the position of the punch holder in the direction of movement thereof, and which bears against the punch holder to force it against a side member of the frame which serves to define a registration surface for alignment of the punch and die assemblies in the punch and die holders.
10. A punching machine according to any one of the preceeding claims, wherein the punch holder is adapted to receive at least two punch assemblies and the punch holder is movable to locate a respective one of the punch assemblies received therein in the operative position.
11. A punching machine substantially as herein described with reference to the accompanying drawings.
GB8008150A 1980-03-11 1980-03-11 Improvements in and relating to punching machines Withdrawn GB2077173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8008150A GB2077173A (en) 1980-03-11 1980-03-11 Improvements in and relating to punching machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8008150A GB2077173A (en) 1980-03-11 1980-03-11 Improvements in and relating to punching machines

Publications (1)

Publication Number Publication Date
GB2077173A true GB2077173A (en) 1981-12-16

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GB8008150A Withdrawn GB2077173A (en) 1980-03-11 1980-03-11 Improvements in and relating to punching machines

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148173A (en) * 1983-10-28 1985-05-30 Charles Henry Clews Copying device for shaping blanks in presses and tools for presses
EP0266626A2 (en) * 1986-11-04 1988-05-11 Firma Muhr und Bender Lower tool holder for a die or the like
GB2381770A (en) * 2001-11-09 2003-05-14 Tradewise Engineering Ltd Punching machine work piece holding and positioning means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148173A (en) * 1983-10-28 1985-05-30 Charles Henry Clews Copying device for shaping blanks in presses and tools for presses
EP0266626A2 (en) * 1986-11-04 1988-05-11 Firma Muhr und Bender Lower tool holder for a die or the like
EP0266626A3 (en) * 1986-11-04 1990-01-17 Firma Muhr und Bender Lower tool holder for a die or the like
GB2381770A (en) * 2001-11-09 2003-05-14 Tradewise Engineering Ltd Punching machine work piece holding and positioning means
GB2381770B (en) * 2001-11-09 2004-12-15 Tradewise Engineering Ltd Punching machine

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)