EP0118948B1 - Apparatus for creasing fold lines in a sheet of cardboard - Google Patents
Apparatus for creasing fold lines in a sheet of cardboard Download PDFInfo
- Publication number
- EP0118948B1 EP0118948B1 EP84200282A EP84200282A EP0118948B1 EP 0118948 B1 EP0118948 B1 EP 0118948B1 EP 84200282 A EP84200282 A EP 84200282A EP 84200282 A EP84200282 A EP 84200282A EP 0118948 B1 EP0118948 B1 EP 0118948B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- creasing
- cardboard
- track
- support surface
- 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.)
- Expired
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/08—Creasing
- B31F1/10—Creasing by rotary tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/25—Surface scoring
- B31B50/256—Surface scoring using tools mounted on a drum
Definitions
- the invention relates to apparatus for creasing fold lines in a sheet of cardboard, comprising a support surface for the cardboard sheet and at least one creasing wheel having a tapered periphery for creasing a fold line in a front side of the cardboard sheet.
- Such an apparatus is disclosed by FR-A-1 246 239.
- This known apparatus comprises a horizontal table for supporting a cardboard sheet that is to be inserted through a horizontal slot at the end of the table in order to make one or more parallel folding lines by means of sets of creasing wheels, a pair of upper wheels being under spring tension, the lower wheel having a central rib and being driven so as to move the cardboard sheet between the wheels.
- the dimension of the cardboard sheet is limited, however, by the length of the horizontal slot, whereas there is no side-guidance for the moving sheet.
- Netherlands patent application No.8102950 shows a folded cardboard component in the form of a lid which covers the top of a stack of tinplate and has preformed creases.
- this lid is illustrated in Fig. 1 of the drawings accompanying the present application. Part of a sheet, unfolded but creased, is shown for this lid in Fig. 1a. After it has been folded by hand by an operative, it has the shape shown in perspective in Fig. 1 b ; the edges of the cardboard sheet are thus bent downward from the top of the lid to form the sides.
- the complete lid is shown (upside down) in Fig. ic. It can be seen that the four long fold lines parallel to the edges are formed in one side of the sheet while the short diagonal fold lines at each corner are formed in the other side.
- the object of the invention is to provide apparatus which can quickly and accurately make the required creases in a sheet of cardboard, e. g. for a lid or cover having top and downwardly extending sides, for which fold lines must be made in both sides of the sheet.
- the apparatus should within certain limits be able to make a large number of sizes of lids out of cardboard sheets of varying dimensions.
- the apparatus according to the invention is characterized by the support surface for the cardboard sheet being upright disposed, a conveyor for bringing the cardboard sheet in an upright position against the support surface, a resilient track adjacent the support surface, the creasing wheel being movable along said track, so as to form a creased fold line when the cardboard sheet is interposed between the creasing wheel and the track, a suction pad for engaging and picking up the cardboard sheet on the support surface and movable horizontally and vertically so as to bring the cardboard sheet into the desired position for creasing on the said track and rotatable so as to rotate the cardboard sheet in its plane in order that fold lines at angles to each other can be creased in the cardboard sheet, and creasing tongs arranged to engage the rear side of the cardboard sheet to form creases therein.
- the cardboard sheet By the feature of the suction pad which can be moved vertically and horizontally over the support surface, the cardboard sheet can be brought in the desired position where it overlaps the resilient track. As the suction pad is also rotatable, preferably stepwise through 90° steps, the cardboard sheet can be creased along four edges. By the feature of the creasing tongs arranged to operate on the other side of the cardboard sheet, a short diagonal fold line can be made in each corner of the cardboard sheet.
- the apparatus has measuring means including at least one contact sensor for determining the dimensions of the sheet and control means adapted to bring the said suction pad to the centre of the sheet as determined from the dimensions thereof, in order to pick up the sheet.
- the dimensions of the surface of a stack of tinplate can vary from 500 to 1 000 mm, in steps of 1 mm. Efforts have been made to standardise the tin-plate dimensions, but even so the dimensions of the sheet of cardboard from which the lid, which is later to be placed on the stack of plate, is folded, are much easier to standardise. For example, it may be possible to achieve a limited number of fixed formats for the sheet, e. g. 10 ; the apparatus of the invention can be capable of rapid adjustment for all formats which occur, both of cardboard sheets and the lids formed from them.
- the pre-creasing of the fold lines in the cardboard sheet is achieved in the apparatus without removal of material ; thus a lid can be folded from the cardboard sheet without making notches at the corners and the creasing may be performed without significantly breaking or bruising the fibres of the cardboard.
- the apparatus of the drawings is particularly adapted for the production of the fold lines for the lid shown in Fig. 1, already described.
- the production of each crease in one side of the sheet of cardboard is achieved by means of the creasing wheel 24 shown in Fig. 2.
- the sheet 20 shown in this figure has a rectangular shape, and a crease 21 is made parallel to each of the sides.
- a resilient track of elastomeric material 22 is used as a blacking for the cardboard, e. g. hard rubber with a hardness of 60° to 70° shore, at 22.
- the creasing wheel 24 is mounted on a spindle 23, and has at its periphery a sharp edge 25 with a taper angle of about 30°.
- the creasing wheel is preferably made of a suitable plastics material, and, for example, has a diameter of 32 cm.
- the edge 25 has a rounding radius of 1 mm.
- the pressure exerted between the wheel 24 and the cardboard is preferably at least 100 kg, in the embodiment being about 200 kg, or even 250 kg.
- FIG. 3 the rubber track of underlayer 22 is again shown with the creasing wheel 24 having its rounded edge 25.
- Fig. 3b shows how deeply the creasing wheel presses into the track 22 taking the cardboard sheet with it and deforming it into a creased fold line (Fig. 3c). In this way the cardboard can be easily and tightly applied later to a stack of tin-plate sheets, the bent cardboard being shown by Fig. 3d.
- a diagonal corner crease line has to be made at each of the four corners of the cardboard sheet on the other side from the lines 21, to enable the cardboard sheet to be folded into a lid, as discussed above in connection with Fig. 1 b. This is done by the creasing tongs, described below.
- Fig. shows the horizontal conveyor which brings the sheet into position on the support surface or panel described below, and shows how a vertical sheet 20 of cardboard is propelled between the continuously driven toothed belt 40 and a set of rollers 41 and 42 which hold the cardboard sheet 20 against the toothed belt 40, until the sheet comes against a fixed stop 43 : at this point, either mechanically or using a photo-electric cell, it is arranged that the rollers 41 and 42 stop their pressing action, so that the sheet comes to rest. The rollers 41 and 42 retract to the position shown by the broken lines.
- the dimensions of the sheet of cardboard so inserted must now be determined, before the crease lines can be formed.
- the dimensions of the cardboard sheet may lie between 750 and 1260 mm and typically come in a total of 10 standardized formats.
- the cardboard typically also has a thickness of 2 mm or less and a weight of 800 to 1 000 g/m 2 .
- the apparatus has contact sensors which move to engage the sheet edges, to determine its size.
- the principle of operation of the apparatus is to displace the cardboard sheet in its own plane by picking it up at its centre-of-gravity using a suction pad such as a vacuum disc.
- a suction pad such as a vacuum disc.
- a vacuum disc is shown in Fig. 6, which illustrates how the sheet of cardboard 20 can be picked up by a flat vacuum disc 60 having an annular seal 61 of soft rubber and a central recess connected via a duct 62 to a vacuum source.
- This vacuum disc can, as shown schematically in Fig. 5, be moved over the cardboard sheet until it reaches the centre-of-gravity of this sheet, and can then be engaged with the cardboard sheet 20. These movements are controlled by the control means.
- the vacuum disc is therefore movable in a horizontal direction and also vertically, and can also be rotated around its axis, as shown in Fig. 5, in order to rotate the sheet which has been picked up by it.
- the illustrated apparatus thus requires only one creasing wheel for making four creases in a sheet of cardboard, and in operation the sheet is rotated by the suction pad in its own plane relative to this wheel so that the creases are formed in the correct places on the cardboard sheet.
- the sheet is thus creased in four steps by successive stepwise rotations through 90°.
- a short diagonal fold line is also made in each corner of the sheet as far as the nearby intersection of the two long crease lines in the rear face of the sheet.
- This is done using a creasing tongs, which makes a fold at about 10° out of the plane of the sheet.
- the principle of operation of the creasing tongs is shown in Fig. 9.
- the creasing tongs has two jaws 90 and 91, which receive the cardboard sheet 20 and are hinged at the fixed pivot 92.
- the jaws are pulled together by-a a lever system 93, 94, 95, 96 which is operated by a piston-and-cylinder unit 97.
- the force applied to the sheet is preferably at least 1 000 kg and may be about 2 500 kg.
- the creasing tongs are preferably adjustable in this respect.
- the corner crease is in each case formed before the cardboard sheet is rotated to the next position, as described above.
- the apparatus is shown in full in Figs. 7 and 8, respectively in side and front elevation.
- the sheet of cardboard which is being creased is omitted for clarity.
- the support panel is slightly tilted back from the vertical as appears from Fig. 7, in order to allow the inserted cardboard to lie easily.
- the cardboard is moved by the horizontal conveyor as described above to a stop and then comes to rest.
- a plotting frame (not shown) forms the dimension determining means described above and is mounted over the support panel having two mutually orthogonal operational co-ordinates, as shown in Fig. 5.
- the rotatable vacuum disc 60 is shown and this can be moved both horizontally and vertically, and can also rotate about its own axis. All movements are controlled by the control means which takes the form of a microprocessor, not shown.
- the rotation of the vacuum disc 60 is always anticlockwise at a rate of 90° per second. Its vertical displacement occurs at a speed of 0.25 m/sec.
- the resilient track 22 is located at one edge of the somewhat tilted support panel.
- the creasing wheel 24 is mounted on a holder 80 which can be moved up and down by a carriage 81.
- the extremitites of the track 22 are bevelled, as may be seen at 26, 27, so that the creasing wheel 24 effects a crease in the cardboard sheet with more certainty (see Fig. 2 and Fig. 3b).
- the creasing tongs is indicated in Fig. 8 schematically by reference number 86.
- cardboard we mean also similar board materials, such as pasteboard.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Making Paper Articles (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Abstract
Description
- The invention relates to apparatus for creasing fold lines in a sheet of cardboard, comprising a support surface for the cardboard sheet and at least one creasing wheel having a tapered periphery for creasing a fold line in a front side of the cardboard sheet. Such an apparatus is disclosed by FR-A-1 246 239. This known apparatus comprises a horizontal table for supporting a cardboard sheet that is to be inserted through a horizontal slot at the end of the table in order to make one or more parallel folding lines by means of sets of creasing wheels, a pair of upper wheels being under spring tension, the lower wheel having a central rib and being driven so as to move the cardboard sheet between the wheels. The dimension of the cardboard sheet is limited, however, by the length of the horizontal slot, whereas there is no side-guidance for the moving sheet.
- In the packing of steel industry products, in particular stacks of tin-plate destined for export, it is desirable to make the packing as secure and compact as possible in order to assist in minimizing damage. Netherlands patent application No.8102950 shows a folded cardboard component in the form of a lid which covers the top of a stack of tinplate and has preformed creases. For convenience, this lid is illustrated in Fig. 1 of the drawings accompanying the present application. Part of a sheet, unfolded but creased, is shown for this lid in Fig. 1a. After it has been folded by hand by an operative, it has the shape shown in perspective in Fig. 1 b ; the edges of the cardboard sheet are thus bent downward from the top of the lid to form the sides. The complete lid is shown (upside down) in Fig. ic. It can be seen that the four long fold lines parallel to the edges are formed in one side of the sheet while the short diagonal fold lines at each corner are formed in the other side.
- The object of the invention is to provide apparatus which can quickly and accurately make the required creases in a sheet of cardboard, e. g. for a lid or cover having top and downwardly extending sides, for which fold lines must be made in both sides of the sheet.
- Preferably the apparatus should within certain limits be able to make a large number of sizes of lids out of cardboard sheets of varying dimensions.
- The apparatus according to the invention is characterized by the support surface for the cardboard sheet being upright disposed, a conveyor for bringing the cardboard sheet in an upright position against the support surface, a resilient track adjacent the support surface, the creasing wheel being movable along said track, so as to form a creased fold line when the cardboard sheet is interposed between the creasing wheel and the track, a suction pad for engaging and picking up the cardboard sheet on the support surface and movable horizontally and vertically so as to bring the cardboard sheet into the desired position for creasing on the said track and rotatable so as to rotate the cardboard sheet in its plane in order that fold lines at angles to each other can be creased in the cardboard sheet, and creasing tongs arranged to engage the rear side of the cardboard sheet to form creases therein.
- By the feature of the suction pad which can be moved vertically and horizontally over the support surface, the cardboard sheet can be brought in the desired position where it overlaps the resilient track. As the suction pad is also rotatable, preferably stepwise through 90° steps, the cardboard sheet can be creased along four edges. By the feature of the creasing tongs arranged to operate on the other side of the cardboard sheet, a short diagonal fold line can be made in each corner of the cardboard sheet.
- Preferably the apparatus has measuring means including at least one contact sensor for determining the dimensions of the sheet and control means adapted to bring the said suction pad to the centre of the sheet as determined from the dimensions thereof, in order to pick up the sheet.
- The dimensions of the surface of a stack of tinplate can vary from 500 to 1 000 mm, in steps of 1 mm. Efforts have been made to standardise the tin-plate dimensions, but even so the dimensions of the sheet of cardboard from which the lid, which is later to be placed on the stack of plate, is folded, are much easier to standardise. For example, it may be possible to achieve a limited number of fixed formats for the sheet, e. g. 10 ; the apparatus of the invention can be capable of rapid adjustment for all formats which occur, both of cardboard sheets and the lids formed from them.
- The pre-creasing of the fold lines in the cardboard sheet is achieved in the apparatus without removal of material ; thus a lid can be folded from the cardboard sheet without making notches at the corners and the creasing may be performed without significantly breaking or bruising the fibres of the cardboard.
- Other features of the apparatus are indicated in the sub-claims.
- A preferred embodiment of the invention, displaying further optional characteristics and advantages of the invention will be described below by way of non-limitative example with reference to the accompanying drawings.
- In the drawings :
- Figures 1a, 1b and 1c show a creased sheet and the lid which is to be made from it, and have been described above.
- Figure 2 shows the principle of the creasing wheel of the apparatus embodying the invention.
- Figure 3 shows schematically the creasing step and the result achieved.
- Figure 4 shows the principle of the horizontal transport of the cardboard sheet being carried into the apparatus by the conveyor.
- Figure 5 shows the principle of displacement of the sheet on the support surface.
- Figure 6 shows schematically the cross-section of the suction pad of the apparatus.
- Figure 7 is a general side elevation of the apparatus embodying the invention.
- Figure 8 is a front elevation of the apparatus embodying the invention.
- Figure 9 is a schematic drawing of the creasing tongs of the apparatus.
- The apparatus of the drawings is particularly adapted for the production of the fold lines for the lid shown in Fig. 1, already described. In the apparatus, the production of each crease in one side of the sheet of cardboard is achieved by means of the
creasing wheel 24 shown in Fig. 2. Thesheet 20 shown in this figure has a rectangular shape, and acrease 21 is made parallel to each of the sides. For this purpose a resilient track ofelastomeric material 22 is used as a blacking for the cardboard, e. g. hard rubber with a hardness of 60° to 70° shore, at 22. Thecreasing wheel 24 is mounted on aspindle 23, and has at its periphery asharp edge 25 with a taper angle of about 30°. The creasing wheel is preferably made of a suitable plastics material, and, for example, has a diameter of 32 cm. Theedge 25 has a rounding radius of 1 mm. The pressure exerted between thewheel 24 and the cardboard is preferably at least 100 kg, in the embodiment being about 200 kg, or even 250 kg. - In Fig. 3 the rubber track of
underlayer 22 is again shown with thecreasing wheel 24 having itsrounded edge 25. Fig. 3b shows how deeply the creasing wheel presses into thetrack 22 taking the cardboard sheet with it and deforming it into a creased fold line (Fig. 3c). In this way the cardboard can be easily and tightly applied later to a stack of tin-plate sheets, the bent cardboard being shown by Fig. 3d. - A diagonal corner crease line has to be made at each of the four corners of the cardboard sheet on the other side from the
lines 21, to enable the cardboard sheet to be folded into a lid, as discussed above in connection with Fig. 1 b. This is done by the creasing tongs, described below. - After thus describing the principles of the creasing of a cardboard sheet, the apparatus will now be described in more detail with reference to Figures 4 to 9. Fig. shows the horizontal conveyor which brings the sheet into position on the support surface or panel described below, and shows how a
vertical sheet 20 of cardboard is propelled between the continuously driventoothed belt 40 and a set ofrollers cardboard sheet 20 against thetoothed belt 40, until the sheet comes against a fixed stop 43 : at this point, either mechanically or using a photo-electric cell, it is arranged that therollers rollers - The dimensions of the sheet of cardboard so inserted must now be determined, before the crease lines can be formed. The dimensions of the cardboard sheet may lie between 750 and 1260 mm and typically come in a total of 10 standardized formats. The cardboard typically also has a thickness of 2 mm or less and a weight of 800 to 1 000 g/m2. When the dimensions of the cardboard sheet are determined and the dimensions of the plate to be packaged are known, the positions of the fold-lines and the width of the downwardly extending sides of the lid to be made are fixed. The apparatus has contact sensors which move to engage the sheet edges, to determine its size.
- Before the fold-lines are creased in the cardboard as shown in Fig. 2 and Fig. 3, the position of its centre is calculated by control means (not shown) from the output of the contact sensors. It must be assumed that this centre coincides with the centre-of-gravity of the sheet.
- The principle of operation of the apparatus is to displace the cardboard sheet in its own plane by picking it up at its centre-of-gravity using a suction pad such as a vacuum disc. Such a disc is shown in Fig. 6, which illustrates how the sheet of
cardboard 20 can be picked up by aflat vacuum disc 60 having anannular seal 61 of soft rubber and a central recess connected via aduct 62 to a vacuum source. This vacuum disc can, as shown schematically in Fig. 5, be moved over the cardboard sheet until it reaches the centre-of-gravity of this sheet, and can then be engaged with thecardboard sheet 20. These movements are controlled by the control means. The vacuum disc is therefore movable in a horizontal direction and also vertically, and can also be rotated around its axis, as shown in Fig. 5, in order to rotate the sheet which has been picked up by it. - The illustrated apparatus thus requires only one creasing wheel for making four creases in a sheet of cardboard, and in operation the sheet is rotated by the suction pad in its own plane relative to this wheel so that the creases are formed in the correct places on the cardboard sheet. The sheet is thus creased in four steps by successive stepwise rotations through 90°.
- As discussed previously, a short diagonal fold line is also made in each corner of the sheet as far as the nearby intersection of the two long crease lines in the rear face of the sheet. This is done using a creasing tongs, which makes a fold at about 10° out of the plane of the sheet. The principle of operation of the creasing tongs is shown in Fig. 9. The creasing tongs has two
jaws cardboard sheet 20 and are hinged at the fixedpivot 92. The jaws are pulled together by-a alever system cylinder unit 97. The force applied to the sheet is preferably at least 1 000 kg and may be about 2 500 kg. - Since the crease line formed by the creasing tongs does not always have to extend at 45° to the sheet edges, the creasing tongs are preferably adjustable in this respect. The corner crease is in each case formed before the cardboard sheet is rotated to the next position, as described above.
- The apparatus is shown in full in Figs. 7 and 8, respectively in side and front elevation. In these figures the sheet of cardboard which is being creased is omitted for clarity.
- The support panel is slightly tilted back from the vertical as appears from Fig. 7, in order to allow the inserted cardboard to lie easily. The cardboard is moved by the horizontal conveyor as described above to a stop and then comes to rest. A plotting frame (not shown) forms the dimension determining means described above and is mounted over the support panel having two mutually orthogonal operational co-ordinates, as shown in Fig. 5. The
rotatable vacuum disc 60 is shown and this can be moved both horizontally and vertically, and can also rotate about its own axis. All movements are controlled by the control means which takes the form of a microprocessor, not shown. The rotation of thevacuum disc 60 is always anticlockwise at a rate of 90° per second. Its vertical displacement occurs at a speed of 0.25 m/sec. - The
resilient track 22 is located at one edge of the somewhat tilted support panel. Thecreasing wheel 24 is mounted on aholder 80 which can be moved up and down by acarriage 81. The extremitites of thetrack 22 are bevelled, as may be seen at 26, 27, so that thecreasing wheel 24 effects a crease in the cardboard sheet with more certainty (see Fig. 2 and Fig. 3b). The creasing tongs is indicated in Fig. 8 schematically byreference number 86. - By the term cardboard •, we mean also similar board materials, such as pasteboard.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84200282T ATE20448T1 (en) | 1983-03-10 | 1984-03-01 | APPARATUS FOR CREATING FOLD LINES IN SHEETS OF CARDBOARD. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8300871 | 1983-03-10 | ||
NL8300871A NL8300871A (en) | 1983-03-10 | 1983-03-10 | MACHINE FOR SCRATCHING FOLDING LINES IN A SHEET OF CARDBOARD FOR LID. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0118948A1 EP0118948A1 (en) | 1984-09-19 |
EP0118948B1 true EP0118948B1 (en) | 1986-06-18 |
Family
ID=19841531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84200282A Expired EP0118948B1 (en) | 1983-03-10 | 1984-03-01 | Apparatus for creasing fold lines in a sheet of cardboard |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0118948B1 (en) |
AT (1) | ATE20448T1 (en) |
CA (1) | CA1224506A (en) |
DE (1) | DE3460236D1 (en) |
NL (1) | NL8300871A (en) |
NO (1) | NO840912L (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3527537C2 (en) * | 1985-08-01 | 1993-12-23 | Lasercomb Laser Kombinationssy | Machine for the production of sample cardboard boxes |
FR2778361B1 (en) * | 1998-05-07 | 2000-07-28 | Groupe Sramag | PROCESS AND DEVICE FOR SLOTTING A STRIP OR SHEET OF SEMI-RIGID MATERIAL, IN PARTICULAR PAPER-CARDBOARD, FOR FOLDING |
CN111645361A (en) * | 2020-05-20 | 2020-09-11 | 福州奔翔包装用品有限公司 | Indentation device for packing carton |
CN113665169A (en) * | 2021-09-01 | 2021-11-19 | 丰城市星泽科技有限公司 | Corrugated carton indentation device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB889692A (en) * | 1958-09-17 | 1962-02-21 | Vickers Armstrongs Ltd | Improvements in or relating to machines for forming fold lines in boards or sheets |
GB1267155A (en) * | 1970-02-18 | 1972-03-15 |
-
1983
- 1983-03-10 NL NL8300871A patent/NL8300871A/en not_active Application Discontinuation
-
1984
- 1984-03-01 EP EP84200282A patent/EP0118948B1/en not_active Expired
- 1984-03-01 DE DE8484200282T patent/DE3460236D1/en not_active Expired
- 1984-03-01 AT AT84200282T patent/ATE20448T1/en not_active IP Right Cessation
- 1984-03-09 NO NO840912A patent/NO840912L/en unknown
- 1984-03-09 CA CA000449255A patent/CA1224506A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0118948A1 (en) | 1984-09-19 |
CA1224506A (en) | 1987-07-21 |
DE3460236D1 (en) | 1986-07-24 |
ATE20448T1 (en) | 1986-07-15 |
NL8300871A (en) | 1984-10-01 |
NO840912L (en) | 1984-09-11 |
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