EP3616863A1 - Punching device - Google Patents

Abstract

The invention relates to a punching device for punching holes in bitumen sheets. The punching device comprises a stamp (2) with a cutting tool (22), a die (3), a base plate (4) and a holder (5). The die (3) is arranged in the base plate (4). The stamp (2) is mounted in the punching direction (50) and can be moved back and forth in the holder (5) above the die (3). The punching device (1) has a spacer dome (6). The spacer dome (6) is arranged at a distance (dl) from the die (3) on the base plate (4). The spacer dome (6) protrudes from the base plate (4) on a side (7) facing the holder (5). The shape of the spacer mandrel (6) corresponds to the shape of the stamp (2).

Description

The invention relates to a punching device for punching holes in connecting sheets, in particular bitumen sheets, for sealing flat roofs according to the preamble of claim 1.

Sealing membranes, for example in the form of plastic, elastomer or bitumen membranes, are used to seal flat roofs. If these so-called connecting tracks are connected to rising components, such as walls, they must be permanently secured against slipping. The upper edge area of a wall-side connection of such a connecting track is usually mechanically secured. One possibility of mechanical securing is to make holes in the connecting track and to fasten the connecting track to the rising component by means of fastening means inserted through the holes. Such holes are made in the prior art with a hammer and punch in the connecting track. The hole edges of the holes thus produced do not have a smooth cut edge. Before the holes are made, the desired position on the connecting track for the holes must be precisely determined and marked by measuring. This can lead to measurement errors. Typically, several holes should be introduced into the connecting track at regular intervals from one another, so that measuring and marking the positions of the holes is time-consuming.

The invention has for its object to provide a punching device with which holes in connecting tracks with smooth hole edges can be introduced quickly and easily at the desired positions.

This object is achieved by a punching device with the feature of claim 1.

The invention provides that the punching device has a punch with a cutting tool, a die, a base plate and a holder, the die being arranged in the base plate and the punch being mounted in the holder above the die so that it can be moved back and forth in a punching direction . This enables holes with a smooth edge to be made quickly and easily in a connecting track. The punching device is advantageously designed so that it can be operated with work gloves. In particular, the stamp can be moved back and forth in the holder with work gloves in the punching direction.

Furthermore, the punching device according to the invention has a spacing mandrel which is arranged at a distance from the die on the base plate, which projects on the side facing the holder on the base plate, and whose shape corresponds to the shape of the stamp.

In this context, "correspond" means that the spacer mandrel can be at least partially inserted into a hole that has been punched with the stamp in a plastic, elastomer or bitumen sheet, which is referred to below as the connecting sheet. The spacer mandrel can be threaded at least partially or entirely into the hole punched by the punch.

As a result, a further hole can be made in the connecting track at the distance at which the spacing mandrel to the die is arranged on the base plate by punching by means of the stamp. This further hole has to the hole made first the same distance as the distance mandrel to the stamp. As a result, two holes can be made in a connecting path at a predetermined distance from one another. The connecting track only has to be placed on the spacer with an already punched hole. In this way, a plurality of holes can also be made in the connecting track, wherein successively made holes are each at the same distance from the previously made hole.

The stamp has a largest stamp cross-sectional area with a largest stamp outer contour in the region of its cutting tool perpendicular to the punching direction. The so-called largest stamp cross-sectional area is the one with the largest stamp outer contour. The largest stamp cross-sectional area is not necessarily the stamp cross-sectional area with the largest area. In a projection in the punching direction, the largest outer stamp contour of the largest stamp cross-sectional area overlaps at least in the region of the cutting tool, all other outer stamp contours of stamp cross-sectional surfaces perpendicular to the punching direction in the region of the cutting tool. The “area of the cutting tool” denotes the area of the stamp over which the cutting tool extends in the punching direction. The largest stamp outer contour is always in the area of the cutting tool. The spacer mandrel has a largest mandrel cross-sectional area with a largest mandrel outer contour perpendicular to the punching direction. The largest cross-sectional area of the mandrel is the one with the largest outer contour of the mandrel. The largest arbor cross-sectional area is not necessarily the arbor cross-sectional area with the largest area. In a projection in the punching direction, the largest outside mandrel contour overlaps all other outside mandrel contours of mandrel cross-sectional areas of cuts perpendicular to the punching direction through the spacer mandrel. In an advantageous further development of the invention, the largest outer mandrel contour corresponds to the largest outer stamp contour. In this context, the word "correspond" means that the spacer mandrel can be completely inserted into a hole previously punched by the stamp. The spacer mandrel can thus be inserted through a hole punched by the stamp in such a way that the connecting track lies against the base plate at least in the area around the spacer mandrel. The The spacer then only protrudes from the connecting track on one side of the connecting track. The fact that the largest mandrel outer contour corresponds to the largest stamp outer contour enables the connecting track to be positioned precisely on the base plate.

The largest cross-sectional area of the mandrel and the largest cross-sectional area of the punch with an imaginary overlay of the two cross-sectional areas can advantageously be arranged in one plane such that the largest outside contour of the punch completely overlaps the largest outside contour of the mandrel. This ensures that the spacer mandrel fits into a hole previously punched by the punch in a connecting track.

The largest outer mandrel contour and the largest outer stamp contour advantageously have the same shape. As a result, the spacer mandrel can be arranged in a hole punched by the punch in such a way that the largest mandrel outer contour lies completely against the edge of the hole. As a result, the connecting track cannot be moved in this position in a plane perpendicular to the punching direction, and the distance from the next hole to be punched by means of the punch and the die to the hole through which the spacer pin is inserted is precisely defined.

The mandrel outer contours of mandrel cross-sectional areas of the spacer mandrel advantageously correspond to the largest mandrel outer contour over at least 80% of a vertical extension of the spacer mandrel extending in the punching direction. As a result, the spacer mandrel with its outer contour can rest over a large area on the edge of an already punched hole. As a result, an exact definition of the distance of a hole to be punched in this position is established in a simple manner.

The outer stamp contours of stamp cross-sectional areas of the stamp expediently correspond to the largest outer stamp contour of at least 80% of an elevation of the stamp extending in the punching direction. This makes the stamp easy to manufacture and can be safely guided through a punched hole.

The largest stamp outer contour is expediently circular. This makes the stamp easy to manufacture, particularly in the area of its cutting tool. In addition, little force is required when punching the holes, since the ratio between the length of the cutting line and the punched area is as small as possible.

The largest outer mandrel contour is expediently circular.

In an advantageous development of the invention, the distance between the spacer mandrel and the die is adjustable. As a result, holes can be made at different distances in one or different connecting tracks.

The base plate advantageously has an at least partially flat surface on its side facing the holder, which lies in a surface plane. As a result, a connecting track can be drawn over the base plate with little resistance. This makes it easy to make several holes in a row in one and the same connecting track.

In an advantageous development of the invention, a stop element is arranged on the side of the base plate facing the holder at a distance from the die and at a distance from the spacer mandrel.

The distance between the die and the spacer mandrel is measured in a distance direction in the surface plane. A stop direction runs perpendicular to the distance direction in the surface plane. The stop element advantageously forms a stop for an object to be punched in the stop direction. As a result, holes can be made in a connecting track at regular intervals, which are at a constant distance from a straight edge of the connecting track. The distance to the straight edge does not have to be measured and marked.

It is sufficient for the straight edge of the connecting track to lie against the stop, while the spacing mandrel is inserted through an already punched hole. As a result, a hole to be punched can be introduced into the connecting track at precise and simply defined distances from an already punched hole and at the same time to an edge of the connecting track.

The stop element advantageously extends parallel to the distance direction over at least one third of the longitudinal extent of the punching device measured in the distance direction. As a result, holes can be introduced into the connecting track at a predetermined distance from a straight edge of a connecting track even without the spacing mandrel being in an already punched hole. The predetermined distance of the holes from a straight edge is determined by the distance between the stop element and the punch measured in the stop direction.

In an advantageous development of the invention, the distance between the stop element and the die, measured in the stop direction, is adjustable. As a result, holes can be introduced into a connecting track at different distances from an edge of a connecting track.

The punching device expediently comprises a further stop element which is designed analogously to the stop element. As a result, a connecting track, for example with its straight edge, can rest against the stop element and the further stop element over at least two thirds of the longitudinal extent of the punching device measured in the distance direction. This enables precise alignment of the connecting track in the punching device.

The base plate advantageously has a base plate hole which completely penetrates the base plate in the punching direction. The die expediently has a die hole which completely penetrates the die in the punching direction. Advantageously overlap the base plate hole and the die hole each other. As a result, punching waste can fall out of the punching device through the die hole and the base plate hole and be collected below the punching device.

The punching device expediently comprises a measuring scale. The measuring scale extends in particular in the distance direction. In this way, for example, the distance of a first hole to be punched from an edge of a connecting track can be determined. The measuring scale can also be used to set a certain distance between the distance mandrel and the stamp.

The cutting tool is advantageously made of hard metal. This makes it possible, in particular, to punch holes in connection sheets from bitumen. It is also possible to punch holes in bitumen-coated connecting sheets made of bitumen using the carbide cutting tool.

In an advantageous development of the invention, the cutting tool is held interchangeably on a base body of the stamp. As a result, the cutting tool can be replaced quickly and easily with a new one in the event of wear. The die is expediently held interchangeably in the base plate. This means that the die can be replaced quickly and easily with a new one if it wears out.

The base plate expediently consists of aluminum and / or sheet steel. This makes the punching device light and can be carried comfortably. Furthermore, the punching device is weather-resistant.

Fig. 1

eine perspektivische Darstellung einer Stanzvorrichtung,

Fig. 2

eine perspektivische Darstellung einer Anschlussbahn,

Fig. 2a

eine perspektivische Darstellung einer Matrize,

Fig. 3

eine Seitenansicht der Anschlussbahn aus Fig. 2,

Fig. 4

eine Draufsicht in Stanzrichtung auf die Stanzvorrichtung aus Fig. 1,

Fig. 4a

eine perspektivische Darstellung eines Abstandsdorns,

Fig. 5

eine Seitenansicht in Abstandsrichtung auf die Stanzvorrichtung aus Fig. 1,

Fig. 6

eine schematische Seitenansicht eines Stempels der Stanzvorrichtung aus Fig. 1 in Anschlagsrichtung,

Fig. 7

einen Schnitt entlang der Linie VII-VII in Fig. 6,

Fig. 7a

eine perspektivische Darstellung des Grundkörpers des Stempels aus Fig. 6,

Fig. 8

eine schematische Seitenansicht des Abstandsdorns der Stanzvorrichtung aus Fig. 1 in Anschlagsrichtung,

Fig. 9

einen Schnitt entlang der Linie IX-IX in Fig. 8.

An embodiment of the invention is explained below with reference to the drawing. Show it:

Fig. 1

a perspective view of a punching device,

Fig. 2

a perspective view of a connecting track,

Fig. 2a

a perspective view of a die,

Fig. 3

a side view of the connecting track Fig. 2 .

Fig. 4

a plan view in the punching direction of the punching device Fig. 1 .

Fig. 4a

a perspective view of a spacer mandrel,

Fig. 5

a side view in the direction of distance from the punching device Fig. 1 .

Fig. 6

is a schematic side view of a stamp of the punching device Fig. 1 in the direction of attack,

Fig. 7

a section along the line VII-VII in Fig. 6 .

Fig. 7a

a perspective view of the base body of the stamp Fig. 6 .

Fig. 8

a schematic side view of the spacer mandrel of the punching device Fig. 1 in the direction of attack,

Fig. 9

a section along the line IX-IX in Fig. 8 ,

Fig. 1 shows a perspective view of a punching device 1. The punching device 1 is provided for punching holes in sealing sheets for flat roofs. These sealing sheets are referred to below as connecting sheets. Such a connecting track 31 is in Fig. 2 shown in perspective. In the Fig. 1 shown punching device is particularly for punching in Fig. 2 holes 32 shown provided in connecting tracks 31 made of bitumen. With the punching device 1, holes can also be punched in connecting strips made of elastomer or plastic.

In the Fig. 1 The punching device 1 shown comprises a punch 2, a die 3 (in Fig. 2a shown), a base plate 4 and a holder 5. The holder 5 is attached to the base plate 4 on one side 7 of the base plate 4. The side 7 of the base plate 4 faces the holder 5. The stamp 2 is mounted in the punching device 5 so that it can move back and forth in a punching direction 50. The base plate 4 has a base plate hole (not shown) which penetrates the base plate 4 completely in the punching direction 50. The base plate hole is arranged in the punching direction 50 below the stamp 2. The die 3 is fastened in the base plate 4 between the stamp 2 and the base plate hole. The die 3 is held interchangeably in the base plate 4. The die 3 is in the Fig. 1 shown die holder 38 held. The die holder 38 is fastened to the base plate 4 by means of screws. As in Fig. 2a shown, the die 3 has a die hole 39 which completely penetrates the die 3 in the punching direction 50. A die cutting edge 40 is arranged along the circumference of the die hole 39. The die hole 39 of the die 3 is arranged in the punching direction 50 above the base plate hole of the base plate 4. As in Fig. 5 shown, a distance d4 measured in the punching direction 50 is formed between the base plate 4 and the holder 5 in the region of the stamp 2. In the Fig. 2 The connecting track 31 shown has a thickness which is smaller than the distance d4 between the holder 5 and the base plate 4.

The punching device 1 has a spacing mandrel 6. The spacer mandrel 6 is in one Fig. 4 distance d1 to die 3 shown on the base plate. As in Fig. 1 As shown, the spacing mandrel 6 protrudes on the side 7 facing the holder 5 via a flat surface 18 of the base plate 4 formed on the side 7. The shape of the spacer mandrel 6 corresponds to the shape of the stamp 2.

Um, as in Fig. 3 shown to introduce a first hole 32 and a second hole 33 at a certain distance d5 from one another into the connecting track 31, the connecting track 31 is between the in Fig. 1 shown stamp 2 and the die 3 placed. The distance d5 between the first hole 32 and the second hole 33 is measured between the centers of gravity of the surfaces delimited by the holes 32, 33. In the exemplary embodiment, the areas delimited by the holes correspond to circles and the centers of gravity correspond to the centers of the circles.

Subsequent to the placement of the connecting track 31, the stamp 2 is pressed down in the punching direction 50 and the first hole 32 is punched into the connecting track 31. Then the punch 2 is moved out of the punched first hole 32 of the connecting track 31 against the punching direction 50 and the connecting track 31 is placed on the punching device 1 such that the spacing mandrel 6 is inserted into the already punched first hole 32 and the connecting track 31 between the Bracket 5 and the die 3 is placed. Then in Fig. 3 illustrated second hole 33 are punched in the connecting track 31 by pressing the punch 2 again in the punching direction 50. The first punched hole 32 can be placed on the spacer 6 because the shape of the spacer 6 corresponds to the shape of the stamp 2. In this case, it can be provided that only a part of the spacer mandrel penetrates into the hole already danced in the connecting track. In the exemplary embodiment, however, the shape of the spacer mandrel 6 corresponds to the shape of the stamp 2 in such a way that the spacer mandrel 6 can be inserted into the hole 32 that has already been punched in such a way that the connecting track 31 also lies in the area of the base plate 4 directly adjacent to the spacer mandrel 6 on the level Surface 18 of the base plate 4 abuts.

As in Fig. 4 shown, the base plate 4 has an elongated hole 24. The elongated hole 24 completely penetrates the base plate 4 in the punching direction 50. The longitudinal direction of the elongated hole 24 extends in a distance direction 60. The distance direction 60 runs perpendicular to the punching direction 50. The distance d1 between the distance mandrel 6 and the die 3 is measured in the distance direction 60. The spacer 6 is in Distance direction 60 and against the distance direction 60 in the slot 24 to and fro. As a result, the distance d1 between the spacer mandrel 6 and the die 3 can be adjusted. The spacer mandrel 6 can be clamped in the slot 24 using a screw, not shown. In the exemplary embodiment, the spacer mandrel 6 is clamped by means of a hexagon screw. The hexagon screw is secured against rotation in a groove on a side of the base plate 4 opposite the side 7 and facing away from the holder 5. As in Fig. 4a illustrated, the spacing mandrel 6 has a circumferential knurl 42 on its circumferential surface. This allows the spacer 6 without tools on the in Fig. 1 screw, not shown, are screwed tight.

When viewed in the punching direction 50 on the side 7 of the base plate 4, the spacing mandrel can be arranged both on one side of the holder 5 and on the other side of the holder 5. As a result, the punching device 1 can be designed for both left-handers and right-handers.

As in Fig. 4 a stop element 19 is arranged on the side 7 of the base plate 4 facing the holder 5 at a distance d2 from the die 3 and at a distance d3 from the distance mandrel 6. In the exemplary embodiment, the size of the distance d2 between the stop element 19 and the die 3 corresponds to the size of the distance d3 between the stop element 19 and the spacer mandrel 6. The stop element 19 is a component of the punching device 1 that is separate from the spacer mandrel 6. The distance d2 between the Die 3 and the stop element 19 and the distance d3 between the spacing mandrel 6 and the stop element 19 are measured in a stop direction 70. The stop direction 70 runs perpendicular to the distance direction 60 and perpendicular to the punching direction 50. As in FIG Fig. 5 illustrated, the flat surface 18 of the base plate 14 extends on the side 7 of the base plate 4 facing the holder 5 in a surface plane E. It can be provided that the base plate on its side facing the holder has a surface which is only at least partially flat is trained. In the embodiment the flat surface extends over the entire side 7 of the base plate 4 facing the holder Fig. 4 Distance direction 60 shown runs in the in Fig. 5 Surface plane E shown. Correspondingly, the distance d1 between the die 3 and the spacer mandrel 6 is also measured in the surface plane E in the distance direction 60. The surface plane E intersects the die 3 and the spacer mandrel 6, whereby a die cut surface with an outer die contour and a mandrel cut surface with an outer mandrel contour are defined. The distance d1 between the spacer mandrel 6 and the die 3 is measured from a center of gravity of an area delimited by the outer mandrel contour to a center of gravity of an area delimited by the outer die contour. In the exemplary embodiment, the area delimited by the outer mandrel contour and the area delimited by the outer die contour are essentially circular. The centers of gravity consequently correspond to the centers of the assigned circles.

The distance d2 between the contact element 19 and the die 3 from the contact element 19 to the center of gravity of the area delimited by the outer contour of the die is measured in an analogous manner. Likewise, the distance d2 between the contact element 19 and the spacer mandrel 6 from the contact element 19 to the center of gravity of the area delimited by the outer mandrel contour is measured.

The stop direction 70 likewise runs in the surface plane E. The stop direction 70 runs perpendicular to the distance direction 60. In the exemplary embodiment, the punching direction 50 is oriented perpendicular to the surface plane E. However, it can also be provided that the punching direction is not perpendicular to the surface plane. The stop element 19 forms a stop in the stop direction 70 for an object to be punched. A stop surface 25 of the stop element 19 extends perpendicular to the stop direction 70. The stop surface 25 of the stop element 19 extends over at least one third of a longitudinal extent l of the punching device 1 measured in the distance direction 60. The stop surface 25 runs parallel to the distance direction 60.

The distance d2 measured in the stop direction 70 between the stop element 19 and the die 3 is adjustable. The stop element 19 comprises a holding element 26. The holding element 26 extends in the stop direction 70. The holding element 26 has a hole 27. The hole 27 completely penetrates the holding element 26 in the direction perpendicular to the surface plane E. The holding element 26 is held on the side 7 of the base plate 4 by means of a bearing block 28. The bearing block 28 is fastened to the base plate 28. In the exemplary embodiment, a screw connection is used for this. The hole 27 is designed in the form of an elongated hole with locking projections. The longitudinal direction of the hole 27 designed as an elongated hole extends in the stop direction 70. The longitudinal direction of the hole 27 designed as an elongated hole extends perpendicular to the stop surface 25 of the stop element 19. As a result, the holding element 26 can be displaced in the stop direction 70 and fixed in accordance with the hole pattern formed by the latching projections become. This allows the distance d3 between the stop surface 25 and the die 3 to be set. No screw has to be loosened or tightened to move and fix the bearing block. In the Fig. 3 Connection path 31 shown has a longitudinal edge 34. The longitudinal edge 34 runs straight. Through the stop element 19, the holes 32 and 33 can be introduced into the connecting track 31 in a simple manner at the same distance d6 measured perpendicular to the longitudinal edge 34. For this purpose, the connecting track 31 is placed with its longitudinal edge 34 against the stop surface 25 of the stop element 19 when the first hole 32 is introduced. The longitudinal edge 34 then runs parallel to the stop surface 25 Fig. 3 shown distance d6 between the hole 32, 33 and the longitudinal edge 34 corresponds to that in Fig. 4 illustrated distance d3 between the spacer mandrel d6 and the stop element 19. In the exemplary embodiment, the distance d3 between the spacer mandrel 6 and the stop element 19 corresponds to the distance, measured in the stop direction 70, between the stop element 19 and the plunger 2 in the region of its in Fig. 6 shown cutting tool 22. The distance d6 between the longitudinal edge 34 and the hole 32, 33 is between the longitudinal edge 34th and a center of gravity of the area delimited by the hole 32, 33. In the exemplary embodiment, the area delimited by the hole 32, 33 corresponds to a circle and the center of gravity corresponds to the center of the circle.

When punching the second hole 33 of the connecting track 31, as described above, the spacing mandrel 6 is inserted through the first hole 32 in the connecting track 31 and, at the same time, the longitudinal edge 34 of the connecting track 31 is placed against the stop surface 25 of the connecting element 19. Again, the longitudinal edge 34 of the connecting track 31 then runs parallel to the stop surface 25 of the stop element 19. The second hole 33 then made in the connecting track 31 is then at the same distance d6 from the longitudinal edge 34 as the first hole 32 already made.

The punching device 1 comprises a further stop element 20. The stop element 20 is designed analogously to the stop element 19. Just like the stop element 19, the stop element 20 has the stop surface 25, the holding element 26 and the hole 27. The stop element 20 is also held on the base plate 4 by means of a bearing block 28. All statements made about the stop element 19 can be transferred to the further stop element 20. The stop element 19 is arranged in the distance direction 60 next to the further stop element 20. The bracket 5 is arranged between the stop element 19 and the further stop element 20.

As in Fig. 4 shown, the punching device 1 has a measuring scale 21. The measuring scale 21 extends in the direction of the distance 60. The position of the first hole 32, which is introduced into the connecting track 31, can be precisely determined by means of the measuring scale 21. As in Fig. 3 shown, the connecting track 31 has a transverse edge 35. The transverse edge 35 runs perpendicular to the longitudinal edge 34. The first hole 32 is arranged at a distance d7 from the transverse edge 35 measured perpendicular to the transverse edge 35. The distance d7 between the first hole 32 and the transverse edge 35 is between the center of gravity of the area delimited by the first hole 32 and the transverse edge 35 measured. In the exemplary embodiment, the area delimited by the hole corresponds to a circle and the center of gravity corresponds to the center of the circle.

The distance d7 between the transverse edge 35 and the first hole 32 is also in Fig. 4 drawn as a section of the measuring scale 21. When the first hole 32 is introduced into the connecting track 31, the connecting track 31 is placed on the base plate 4 of the punching device 1 in such a way that the transverse edge 35 of the connecting track 31 is located at the end of the measuring section of the measuring scale 21 that is remote from the die 3 Fig. 4 is marked with the distance d7. At the same time, the longitudinal edge 34 of the connecting track 31 bears at least on the further stop element 20.

Fig. 4 shows a stop measuring scale 43. The stop measuring scale 43 extends in the stop direction 70. The stop measuring scale serves to determine the distance d2 between the die 3 and the stop element 19. The distance d3 between the die 3 and the stop element 19 corresponds to the distance d6 between that in FIG Fig. 3 shown longitudinal edge 34 and the hole 32nd

Fig. 6 shows a schematic side view of the stamp 2. The stamp 2 comprises the cutting tool 22. Furthermore, the stamp 2 comprises a base body 23. The cutting tool 22 is held interchangeably on the base body 23 of the stamp 2. The stamp 2 is designed so that commercially available cutting tools from large series productions can be used. The cutting tool 22 in the exemplary embodiment is such a cutting tool. At its end opposite the cutting tool 22, the base body 23 has a connecting element 30. A toggle lever or a rack and pinion press can be connected to the stamp 2 on the connecting element 30. By means of the toggle lever or rack press, the stamp 2 in the in Fig. 1 bracket 5 shown can be moved back and forth with great pressure without great effort. The connecting element can also be provided for connecting a drive motor for the back and forth movements of the stamp.

The cutting tool 22 is made of hard metal. It can also be provided that the in Fig. 1 die 3 shown consists at least partially of hard metal. The base plate of the punching device can consist of aluminum and / or sheet steel. In the exemplary embodiment, the base plate 4 is an aluminum milled part. It can be provided that the base plate has openings to save weight.

As in Fig. 7 shown, the cutting tool 22 has essentially the shape of a cylinder. As in Fig. 6 shown, the cylinder has a cutting edge 29 at its one longitudinal end. It can be provided that the cutting edge for a drawing cut obliquely to the punching direction 50, ie obliquely to the in Fig. 5 shown level E, runs. This can be achieved by a beveled longitudinal end of the cylinder. In the exemplary embodiment, however, the cutting edge 29 runs essentially perpendicular to the punching direction 50. The cutting edge 29 is formed on the longitudinal end of the cutting tool 22, which is remote from the base body 23 of the punch 2. The cutting edge 29 runs around the punching direction 50 in the circumferential direction around the punching direction 50. As in Fig. 6 is shown, a largest diameter a1 of the cutting edge 29 measured perpendicular to the punching direction 50 is larger than a largest diameter a2 of the base body 23 measured perpendicular to the punching direction 50. However, it can also be provided that the largest diameter of the cutting edge and the largest diameter of the base body are the same are great.

Fig. 7 shows a section through the cutting tool 22 of the in Fig. 6 shown stamp 2 along the section line VII-VII. A cross-sectional area 12 of the stamp 2 is shown in FIG Fig. 7 shown hatched. The cross-sectional area 12 of the stamp 2 is assigned a stamp outer contour 13, which in Fig. 7 is shown in dashed lines. As in the Fig. 6 and 7 2, the punch 2 has a largest punch cross-sectional area 8 with a largest punch outer contour 9 with respect to the punching direction 50 in the area of its cutting tool 22 perpendicular to the punching direction 50. The largest stamp outer contour 9 is in Fig. 7 shown in dashed lines.

As in Fig. 6 shown, the stamp 2 has a height extension 17 extending in the punching direction 50. Stamp outer contours 13 of stamp cross-sectional areas 12 of the stamp 2 correspond to the largest stamp outer contour 13 over at least 60% of the height dimension 17. In other words, in relation to the exemplary embodiment, the outer diameter of the stamp 2, which is essentially cylindrical on the outside, is constant over at least 60% of its height dimension 17. In Fig. 7 the stamp outer contour 13 and the associated stamp cross-sectional area 12 of a stamp outer contour are shown, in which this is the case. In the exemplary embodiment, the cross-sectional area 12 of the stamp 2 corresponds to the largest stamp cross-sectional area 8. The stamp outer contour 13 corresponds to the largest stamp outer contour 9 in the exemplary embodiment.

In the exemplary embodiment, the largest stamp outer contour 9 is circular.

Fig. 7a shows a perspective view of the base body 23 of the stamp 2. The base body 23 has an internal thread 41 at its longitudinal end facing the cutting tool 22. This in Fig. 7 The cutting tool 22 shown is screwed into the internal thread 41.

Fig. 8 shows a schematic side view of the spacing mandrel 6 in the stop direction 70. Fig. 9 shows a section along the in Fig. 8 shown section line IX-IX. From the synopsis of 8 and 9 it follows that the spacing mandrel 6 essentially has the shape of a solid cylinder.

The spacer mandrel 6 has a largest mandrel cross-sectional area 10 with a largest mandrel outer contour 11 perpendicular to the punching direction 50. The largest cross-sectional area 10 of the mandrel corresponds to that in FIG Fig. 9 Cross-sectional area 14 of the spacing mandrel 6 shown. The largest mandrel outer contour 11 of the associated largest mandrel cross-sectional area 10 is in Fig. 9 shown in dashed lines. In the exemplary embodiment, the largest mandrel outer contour 11 is circular.

As in Fig. 8 illustrated, the spacing mandrel 6 has a height extension 16 extending in the punching direction 50. As seen from the synopsis of 8 and 9 results, mandrel outer contours 15 of mandrel cross-sectional areas 14 of the spacer mandrel 6 correspond to at least 80% of the height of the largest mandrel outer contour 11. It can also be provided that mandrel outer contours of mandrel cross-sectional areas of the spacer mandrel correspond to the largest mandrel outer contour over the entire height dimension. The mandrel cross-sectional areas 14 are each cross sections perpendicular to the punching direction 50 through the spacer mandrel 6. In Fig. 9 For example, a mandrel cross-sectional area 14 is drawn with an outer mandrel contour 15 which corresponds to the largest mandrel outer contour 11. With regard to the exemplary embodiment, it can be formulated that the diameter of the essentially fully cylindrical spacing mandrel 6 is constant over at least 80% of its height extension 16. It can also be provided that the diameter of the essentially fully cylindrical spacing mandrel is constant over its entire height extension.

In the exemplary embodiment, the in Fig. 7 shown largest stamp outer contour 9 with the in Fig. 9 largest mandrel outer contour shown 11. This means that the in Fig. 1 illustrated spacer 6 completely in a by means of in Fig. 6 shown cutting tool 22 of the punch 2 in the in Fig. 3 Connection path 31 shown introduced hole 32, 33 can be inserted. Three cases are possible. In the first case, the spacer can be inserted with play into the already punched hole in the connecting track. This is the case in the exemplary embodiment. As in Fig. 6 shown, the punch 2 has the largest diameter a1 in the region of the cutting tool 22. In Fig. 9 A largest diameter a3 of the spacing mandrel 6 measured perpendicular to the punching direction 50 is shown. The largest diameter a1 of the punch 2 is larger than the largest diameter a3 of the spacer mandrel 6. In the second case, the outer diameters of the spacer mandrel 6 and the punch 2 are in the region of it Cutting tool 22 the same size. Here, the largest mandrel outer contour 11 and the largest outer stamp contour 9 have the same shape. One in Fig. 8 The peripheral wall 36 of the spacing mandrel 6 shown is then in the arrangement of the in Fig. 2 shown hole 32 of the connecting track 31 on the spacer 6 straight on an inner wall 37 of the hole 32. In the third case there is a press fit. The largest stamp outer contour is then so large that with an imaginary overlay of the largest stamp cross-sectional area and the largest mandrel cross-sectional area in one plane, the two cross-sectional areas can be arranged such that the largest stamp outer contour completely encloses the largest mandrel outer contour. In order to insert the spacer mandrel into the already punched hole in the connecting track, the connecting mandrel must be pressed into the hole. The circumferential wall of the spacer mandrel then lies completely against the inner wall of the hole. The diameter of the spacer mandrel is larger than the diameter of the hole in the connecting track if there is no spacer mandrel in it. All three cases are covered by the statement that the shape of the spacing mandrel 6 corresponds to the shape of the stamp 2.

Claims (15)

Punching device for punching holes in connecting sheets for sealing flat roofs comprising: - a stamp (2) with a cutting tool (22), - a die (3), - A base plate (4) and - a holder (5), wherein the die is arranged in the base plate (4), the punch (2) being mounted to move back and forth in a punching direction (50) in the holder (5) above the die (3), the punching device (50) being one Spacer mandrel (6), the spacer mandrel (6) being arranged at a distance (d1) from the die (3) on the base plate (4), the spacer mandrel (6) being located on a side (7) facing the holder (5). protrudes over the base plate (4), and the shape of the spacer mandrel (6) corresponds to the shape of the stamp (2). Punching device according to claim 1,
characterized in that the punch (2) in the area of its cutting tool (22) perpendicular to the punching direction (50) has a largest punch cross-sectional area (8) with a largest punch outer contour (9), that the spacing mandrel (6) perpendicular to the punching direction (50) has the largest mandrel cross-sectional area (10) with a largest mandrel outer contour (11), and that the largest mandrel outer contour (11) corresponds to the largest outer stamp contour (9). Punching device according to claim 2,
characterized in that mandrel outer contours (15) of mandrel cross-sectional areas (14) of the spacer mandrel (6) correspond to the largest mandrel outer contour (11) over at least 80% of a height extension (16) of the spacer mandrel (6) extending in the punching direction (50). Punching device according to claim 2 or 3,
characterized in that stamp outer contours (13) of stamp cross-sectional areas (12) of the stamp (2) correspond to the largest stamp outer contour (13) over at least 60% of an elevation (17) of the stamp (2) extending in the punching direction (50). Punching device according to one of claims 2 to 4,
characterized in that the largest outer mandrel contour (11) and the largest outer stamp contour (9) have the same shape. Punching device according to one of claims 2 to 4,
characterized in that the largest cross-sectional area of the mandrel (10) and the largest cross-sectional area of the punch (8) with an imaginary overlay of the two cross-sectional areas (8, 10) can be arranged in one plane such that the largest external contour of the punch (9), the largest external contour of the mandrel (11) completely overlapped. Punching device according to one of claims 1 to 6,
characterized in that the distance between the spacer mandrel (6) and the die (3) is adjustable. Punching device according to one of claims 1 to 7,
characterized in that a stop element (19) is arranged on the side (7) of the base plate (4) facing the holder (5) at a distance (d2) from the die (3) and at a distance (d3) from the distance mandrel (6) is. Punching device according to claim 8,
characterized in that the base plate (4) on its side (7) facing the holder (5) has an at least partially flat surface (18) which lies in a surface plane (E) such that the distance (d1) between the die ( 3) and the spacer mandrel (6) in the surface plane (E) is measured in a spacing direction (60), and that the stop element (19) in a stop direction (70) which is perpendicular to the spacing direction (60) in the surface plane (E) runs, forms a stop for an object to be punched. Punching device according to claim 9,
characterized in that the stop element (19) extends over at least one third of the longitudinal extent (l) of the punching device (1) measured in the distance direction (60) parallel to the distance direction (60). Punching device according to one of claims 8 to 10,
characterized in that the distance (d2) measured in the stop direction (70) between the stop element (19) and the die (3) is adjustable. Punching device according to one of claims 8 to 11,
characterized in that the punching device (1) comprises a stop measuring scale (43) for determining the distance (d2) between the die (3) and the stop element (19), and in that the stop measuring scale (43) extends in the stop direction (70). Punching device according to one of claims 1 to 12,
characterized in that the punching device (1) comprises a measuring scale (21) and that the measuring scale (21) extends in the distance direction (60). Punching device according to one of claims 1 to 13,
characterized in that the cutting tool (22) is held interchangeably on a base body (23) of the stamp (2). Punching device according to one of claims 1 to 14,
characterized in that the die (3) is held interchangeably in the base plate (4).

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