DE102016102240A1 - Device for connecting profile pieces - Google Patents

Abstract

A device (2, 2 ', 2' ') is described for connecting at least two profile pieces (72, 80) made of plastic, with - at least one clamping element (8) movable in a first joining direction (x) for clamping a first profile piece (72 ), - a heating element (82) having at least one heating surface (84, 86) which is engageable with at least one joining side (74) of at least one of the profile pieces (72, 80) to at least one of the profile pieces (72, 80) on its joining side (74) before joining with the other profile piece (72, 80), and - at least one inner corner tool (24) for machining an inner corner (90) of at least one of the profile pieces (72, 80), wherein the at least an inner corner tool (24, 26) has a pressure piece (54), wherein the pressure piece (54) is movable in a first displacement direction (z) for machining the inner corner (90), which has an angle (α) to a first profile longitudinal direction (b). zwisc hen 0 ° and 45 °.

Description

The invention relates to a device for connecting two profile pieces made of plastic. The device has at least one clamping element movable in a first joining direction for clamping a first profile piece.

Devices of the type mentioned are used in particular for welding PVC profile bars to window frames or door frames. For this purpose, the profile bars are cut to length before welding to the required length and, if necessary, mitred to connect the profile pieces then to the cut surfaces, ie at the miter cutting surfaces by welding.

The actual welding of the profile pieces is carried out by melting and then joining the connecting surfaces of the profile bar ends. For this purpose, the profile pieces to be welded are first placed in a corresponding device and positioned by means of stops and guides. Then, the connecting surfaces for the so-called Angleich- and Anwärmprozess be pressed in a joining direction against the heating surface of the heating element, wherein material is melted at the connecting surface, ie in the welding area. After heating, the switching and joining follows, with the heating element removed between the profile pieces. Finally, the profile pieces with the melted connection surfaces, so the molten weld area in the joining direction towards each other, ie pressed against each other, wherein the still hot, thermoplastic material of the two profile bar ends connects such that a stable welded joint is formed. Such an approach is, for example, in the introductory DE 10 2012 112 533 A1 mentioned.

In the DE 10 2012 112 533 A1 Parallel thrust and diagonal thrust are also mentioned. In the parallel thrust method, the mitred or connecting surfaces move during the melting process from both sides evenly to the heating surfaces of the centrally fixed heating element, wherein the movement of the profile pieces, for example, in opposite directions and perpendicular to the miter cutting surfaces or perpendicular to the longitudinal axis of the profile piece. On the other hand, in the diagonal pushing method, one of the profile pieces is fixedly positioned while both the other profile piece and the heating element are moved in the longitudinal direction of the fixed profile piece.

The joint partners themselves are so-called erosion longer than the later finished dimension of the connected elements. Part of this burn-off is melted off the heating element, another part is joined (compressed) in a next step. This ratio of melting and compression of the burnup is variable. The burnup itself can be different.

During the actual Abschmelzprozesses the PVC begins to flow and deforms, here, the melt moves inward in the profile chambers and outward on the viewing surfaces of the PVC profile. In order to control this flow and deformation outwards, that is to say on the visible surfaces, the profile is provided with delimiting elements, such as e.g. Boundaries narrowed (limited). However, this limiting element is known manner in the welding process itself immovably connected to the profile carriers. Although the boundary elements themselves can be adjusted tightly, they do not come into contact with the profile stop and the heating element, so there is always a defined gap into which the melt can flow. This outwardly pressed melt solidifies in the subsequent joining process, so that forms a weld bead. After a certain cooling time, this welding bead must be removed in subsequent machines (plastering machines). This can be done in several ways, such as grooving or flushing off.

However, the removal of the weld bead is very time-consuming and costly in a manual procedure but also by mechanical means.

From the DE 20 2015 000 908 U Device for welding two plastic profiles consisting of two for the welding process in the pressing direction relative to each other movable clamping units is known. The clamping units each take a plastic profile between a lower and upper boundary plate with a mitred pressing edge. The device still has a welding mirror. The pressing edge is formed on a separate, located in a step-like recess of each boundary plate bar, wherein the bar is guided in the recess of the limiting plate perpendicular to the pressing edge. The pressing edge protrudes in the basic position of the bar beyond the front edge of the limiting plate, and is designed to be displaceable in the pressing direction against a force at the initiation of the welding process. The boundary plate is thus formed of a rigid sub-element and a movable only in the plane of the rigid sub-element part element, wherein the movable sub-elements is urged on pins against a spring force in the direction of the rigid sub-element is urged when the molten profile piece ends are pressed against each other. So could during welding a gap-free state be reached between the pressing edges of the strips. However, the strips protrude beyond the miter edge of the boundary plates only with a fixed, individually predetermined dimension, and this measure to be specified must correspond to the predetermined pressing path at the weld. In this respect, an individually produced boundary plate must be generated for each press. So an immense effort is inevitable even with regard to the storage of stock to be provided boundary plates, which can meet the individual welding task. Also, the immense cost of producing the individually produced boundary plate are not negligible.

Meanwhile, also foiled profiles are used for the production of window and door frames. Such films serve to give the window and door frames a different appearance. When joining appropriate profiles, the handling of the film is problematic. The necessary after the prior art post-processing of weld beads in the joining area, the thin films can be easily damaged. In particular, in automatic or semi-automatic machines can thus create an increased committee, which should be avoided for cost reasons.

Thus, the task of further developing devices of the type mentioned in such a way that a processing of sound framework with less waste is possible.

The object of the invention is to provide an improved method and an improved device for joining plastic profile pieces, wherein the outlet of the melt controllable and a shaping of the welding area in the connection itself can be influenced, so that a reworking can be omitted completely or at least partially ,

The object is achieved by a device having the features of claim 1. Further developments are the subject of the dependent claims.

Hereinafter, a device for connecting at least two profile pieces made of plastic will be described. The device has at least one clamping element movable in a first joining direction for clamping a first profile piece. Furthermore, a heating element is provided, which has a heating surface, which can be brought into contact with at least one joining side of at least one profile piece in order to melt the at least one profile piece on the joining side before joining with the other profile piece. Furthermore, the device has at least one inner corner tool for processing an inner corner of the profile pieces, wherein the inner corner tool has a pressure piece which is movable for machining the inner corner in a first displacement direction, which has an angle between 0 ° and 45 ° to a first profile longitudinal direction.

The profile pieces consist in particular predominantly of a thermoplastic material. Thermoplastics can be heated and deformed. In the heated state, two parts made of a thermoplastic material can be joined. The profile pieces can be foiled.

Instead of a clamping element, a plurality of clamping elements may be provided, in particular per corner two clamping elements that can hold two profile pieces that are to undergo a corner joint to produce, for example, a frame, in particular a window or door frame. The device may be designed such that four corners are produced simultaneously, in which case eight clamping elements are provided.

The heating element is often referred to as a heating mirror. The heating mirror may have one or two heated surfaces in order to melt both profile pieces at the same time. In the case of two heated surfaces, the heated surfaces are usually parallel to each other. The surfaces are usually flat. The heating element can be moved. The heating element can in particular be retracted and moved out between two associated clamping elements. As explained above, at least one of the profile pieces can be heated by the heating element above the melting temperature in order to be joined to the other profile piece.

The profile pieces are usually mitred. With standard corner angles of 90 ° between the profile pieces and with equally wide profile pieces, the miter angle is 45 ° degrees. Normally, the heating element is aligned parallel to the miter plane.

With the help of Inneneckwerkzeugs a resulting inside the joining of the profile pieces inner corner can be shaped or kept in shape. As described above, liquid plastic is displaced when joining. If the displacement is not controlled, a weld bead is produced, which must be removed on a visible side according to the prior art by parting blades. On surfaces where two profile pieces abut each other, it is also known to control the plastic flow through barriers.

By joining the profile pieces, the profile pieces are shortened by the erosion, so that changed the position of the clamping elements relative to the joining surface during joining, which requires that the control of the plastic flow in the inner corners of the plastic profiles is difficult. In addition, the profile pieces in these areas are often contoured complex.

If foiled profile pieces are used, welding seams can not be tapped because the foil would be tapped in this case.

Characterized in that the pressure piece is movable in a displacement direction, which has an angle between 0 ° and 45 ° relative to a first Profilstablängsrichtung, a resulting bead of liquid plastic can be transferred.

According to a first further refinement, the angle between the first displacement direction and profile longitudinal direction can be between 0 ° and 22.5 °, in particular between 10 ° and 22.5 °, in particular 22.5 °. In this way, the displacement direction is within a surface which is spanned by the first profile longitudinal direction and a lengthening of a miter edge. By using angles in the region of the bisecting line between the first profile longitudinal direction and an extension of a miter edge, a good compromise between available installation space for the pressure piece and Inneneckformung can be kept.

According to a further possible development it is provided that the pressure piece has a guide projection which protrudes beyond the remaining pressure piece in the first displacement direction.

It has been found that when using adapted to the contour of the profile pieces pressure pieces for Inneneckbearbeitung during the process of the pressure pieces relative to the profile pieces to compensate for the burn-up damage to the films may arise.

By using a guide projection, the contact surface between profile piece and pressure piece can be minimized, so that the risk of damage is reduced. The pressure piece can still come in the inner corner to rest with the profile pieces to be joined.

According to a possible further development, the guide projection can be designed such that it deflects a bead of liquid plastic inward on the inside corner in order to prevent the formation of a welding bead. For this purpose, the guide projection can be positioned such that it projects beyond the profile piece at the inner corner.

The pressure piece can be adapted to the contour of the profile pieces and exchangeable to allow the processing of several different profile pieces.

According to a further possible embodiment, the inner corner tool may comprise a guide, with which the pressure piece is guided, wherein the pressure piece is supported on the guide in the first displacement direction against at least one biasing element. Thus, the pressure piece can be moved by the biasing member relative to the biasing member. The biasing element may be, for example, a spring.

Alternatively to the biasing element may be provided according to another embodiment, an actuator which moves the pressure piece.

According to another possible embodiment it can be provided that the pressure piece is supported on the guide in the first displacement direction in the direction of the profile piece against at least one biasing element. In this way, a defined contact force to the profile piece is possible. By the mobility of the pressure piece in a direction perpendicular to the first joining direction unevenness and tolerances can be compensated.

In another further embodiment, the inner corner tool may have a bearing on which the pressure piece is pivotably mounted, wherein a pivot axis of the bearing extends perpendicular to a bearing surface of the clamping element. This allows a tolerance compensation when driving along the profile piece.

In particular, in the combination of the two aforementioned embodiments, the pressure piece can be pivoted defined against a biasing force, whereby the pressure piece to compensate for tolerances and at the same time can be performed exactly to the inner corner.

According to a further embodiment, the pressure piece can be slidably guided on the tensioning element. The clamping element may have a support on which the profile piece rests. The pressure piece can be guided on the support, whereby a complete contouring of the inner corner is possible.

In a further embodiment, the pressure piece may have a contact surface for engagement with the heating surface. Using the contact surface, the pressure piece can be kept at the same height as a front side of the profile piece and prevent deformation of the profile piece by heating.

According to a further embodiment, the clamping element may have a miter edge, wherein the contact surface of the pressure piece does not protrude beyond the miter edge. The miter edge of the clamping element can be parallel to the end face of the profile piece to be joined.

In another embodiment, a pressure piece stop may be provided for adjusting the stroke of the pressure piece around a bearing journal in the first displacement direction. Thus, the position of the pressure piece can be controlled relative to the profile piece. The stop can be adjustable in order to be able to set a suitable end position for the pressure piece for different profile piece contours.

In another further embodiment, a linear pressure piece stop can be set up such that the contact surface of the pressure piece in the stop position is in line with the miter edge. In particular, when the pressure piece stop abuts against the heating surface, the correct position can already be set.

Alternatively, it can be provided that the contact surface of the pressure piece protrudes beyond the miter edge in the first profile bar direction. This can be useful if a plastic bead is to be bent over.

In a further embodiment, it can be provided that the guide projection has a rounded contact contour. As a result, damage to the profile piece can be prevented.

According to another further embodiment, a second clamping element may be provided for a second profile piece, which is movable in a second joining direction, wherein the second joining direction is perpendicular to the first joining direction. Furthermore, at least one further inner corner tool for processing an inner corner of the profile pieces, wherein the Inneneckwerkzeug has a pressure piece which is movable relative to the second clamping element in the second joining direction of the second profile piece, wherein the pressure piece has a guide projection which is perpendicular to the first joining direction the pressure piece protrudes.

Alternatively, according to a further embodiment, a second clamping element is provided, which is fixed in the second joining direction. In this way, the number of necessary Akuatoren can be kept low.

In a further embodiment may be attached to the second clamping element, a pressure piece, which is designed and movable according to the previous pressure piece.

In another further embodiment, an inner corner tool and / or an upper inner corner tool can be attached to one or both of the clamping elements. As a result, the inner corner can be processed on two sides of the profile piece.

The embodiments listed above can be applied correspondingly to the second unit of clamping element and inner corner tool, so that a substantially functionally mirror-symmetrical arrangement is formed, which can edit the frame corner formed from the profile pieces from both sides.

Other objects, advantages, features and applications of the present invention will become apparent from the following description of an embodiment with reference to the drawings, wherein identical or equivalent elements are usually provided with the same reference numerals. All described and / or illustrated features alone or in any meaningful combination form the subject matter of the present invention, also independent of their summary in the claims and their dependency.

They show schematically:

1 a perspective view of a device according to a first embodiment for connecting two profile pieces,

2 a perspective view of a device according to a second embodiment for connecting two profile pieces,

3 the view 2 with partially hidden components,

4 the device off 2 from a viewing direction below a support plane,

5 a perspective view of a clamping element of the device 1 with inner corner tool and clamped profile piece,

6 a perspective view of the clamping element 4 from a different perspective with detail enlargement,

7 a top view of the device at the onset of melting,

8th a top view of the device at the end of melting,

9a a plan view of the device after removal of a heating mirror in a first variant,

9b a top view of the device after removal of a heating mirror in a second variant,

10 a top view of the device during the joining process,

11 an enlarged perspective view of a pressure piece,

12 a further embodiment of the device with two Inneneckwerkzeugen per profile piece and

13 an enlarged perspective view of the leadership of a pressure piece on a profile piece.

In the following embodiments, identical or equivalent components are provided with the same reference numerals for better readability.

1 a perspective view of a device 2 according to a first embodiment for connecting two profile pieces (not shown).

The device 2 has a first profile carrier 4 and a second profile carrier 6 on. The profile beams 4 . 6 are arranged at right angles to each other. The first profile beam 4 can be moved in a first joining direction x. The second profile beam 6 can be moved in a second joining direction y, wherein the first joining direction x and the second joining direction y are perpendicular to each other.

The first profile beam 4 has a first clamping element 8th for clamping a in 1 Not shown first profile piece. The second profile beam 6 has a second clamping element 10 for clamping a in 1 not shown second profile piece. For clamping the respective profile pieces have the profile support 4 . 6 each edition 12 . 14 as well as attacks 16 . 18 on. In addition, terminals may be provided, which are not shown here. The terms 12 . 14 each have a mitred edge 20 . 22 on, which in the present case are shown abutting one another.

The first profile beam 4 has a first inner corner tool 24 on. The Inneneckwerkzeug serves to form or ensure the shape of a mold inside corner of a frame corner produced by the two profile pieces. A corresponding second inner corner tool 26 is on the second profile carrier 6 intended. The inner corner tool 24 is only partially shown to show the underlying structure.

The interior corner tools 24 . 26 have guide housing 28 . 30 on which bolts 32 . 34 are fixed, on which plungers 36 are guided. The guide housing 28 . 30 are on the clamping elements 8th . 10 established. The guide housings provide linear pressure piece stops 37.1 . 37.2 represents.

The inner corner tool 24 belonging pressure piece is hidden, only the inner corner tool 26 associated pressure piece 36 is presented, layed out. The pressure piece 36 has an adapted to the contour of the profile piece to be machined contour to protect the inner corner from deformation by the joining process.

The pressure piece 36 has a guide projection 38 on, which is adapted to come with the corresponding profile piece to the plant. The leadership advantage 38 is designed so that it does not damage the profile piece and slides easily on the profile piece.

This is the leadership advantage 38 designed edge-free in the guide area, in particular rounded.

By the on the inner corner tool 24 blanked pressure piece is the structure of the guide to recognize. At the bolt 32 is a recording 40 arranged on which the pressure piece can be plugged. The pressure piece is by a bearing pin 42 fixed. The pressure piece 36 on the inner corner tool 26 is through a journal 44 fixed. The pressure pieces 36 are characterized by the respective journal 42 . 44 rotatable.

The pressure pieces 36 be through two bias springs 46 . 48 against the guide housing 28 . 30 are biased in the respective joining direction x and y respectively. The bias springs 46 . 48 each supported on the one hand on the guide housing 28 . 30 off and on the other hand at the reception 40 ,

At the reception 40 are still bias springs 50 . 52 arranged, which is the pressure piece of the first inner corner tool 24 perpendicular to the first joining direction x, ie in the second joining direction y, to bias the profile piece. In this way and by the respective storage of the pressure pieces 36 at the journal 42 . 44 can be a defined contact force of the pressure pieces 36 be created on the profile pieces while allowing a tolerance compensation.

The pressure pieces 36 are interchangeable, so that suitable pressure pieces can be used for different profile piece contours.

2 shows a perspective view of a device 2 ' according to a second embodiment for connecting two profile pieces (not shown).

In the illustrated embodiment, the guidance of the Inneneckwerkzeuge 24 . 26 solved differently than in the first embodiment. Instead of two guide housing on the support side of the profile pieces, the guide is substantially below the pads 12 . 14 executed.

In addition, the first inner corner tool 24 with a pressure piece 54 shown. The two pressure pieces have a mutually mirror-symmetrical contour and touch each other in the position shown with the guide projections 38 . 56 ,

3 shows the view 2 with partially hidden components. The first inner corner tool 24 is with stops 58.1 . 58.2 equipped to the swing stroke of the pressure piece 54 to limit. The attacks 58.1 . 58.2 are adjustable.

The guide of the pressure piece 54 is from a carriage 60.1 and a guide rail guided therein 60.2 accepted.

4 shows the device 2 ' out 2 from a viewing direction below a support plane.

The guide rails 60.2 . 62 are each by a biasing spring 64 . 66 supported.

The pressure pieces 36 . 54 are on trunnions 42 ' . 44 ' pivoted.

5 shows a perspective view of the first clamping element 8th the device 2 with first inner corner tool 24 and clamped first profile piece 72 ,

The first profile piece 72 has a first joining side 74 on, which is to be connected to a second profile piece. The process is in the 6 to 9 shown in more detail. The first joining site 74 is mitred and lies with the miter edge 22 at the same height. This can be achieved by a Einrichthilfe, for example, aligned in the direction of miter plate that a common stop for the miter edge 22 and the first joining side 74 forms.

The first inner corner tool 24 lies on the first profile piece 72 at. This system prevents melting of liquid plastic of the profile piece 72 out of shape.

The first inner corner tool 24 furthermore has a contact surface 76 for attachment to an in 5 Not shown heating surface. The contact surface 76 is in the present case flush with the first joining side 74 and the miter edge 22 ,

The profile piece 72 is further by the edition 12 and the stop 16 positioned.

6 shows a perspective view of the first clamping element 8th out 5 from another perspective with detail magnification.

The leadership advantage 56 serves to guide the pressure piece 54 on the first profile piece 72 ,

7 shows a plan view of the device 2 at the onset of melting.

Next to the first profile piece 72 is one in the second clamping element 10 held second profile piece 80 shown, which is also mitred. The second profile piece 80 has a second Profilstablängsrichtung c, which is substantially perpendicular to the first Profilstablängsrichtung b of the profile piece 72 stands. The first joining direction x is perpendicular to the first profile longitudinal direction b, the second joining direction y is perpendicular to the second profile longitudinal direction c.

In alternative embodiments, the joining directions may be parallel to the respective profile longitudinal directions.

Between the profile pieces 72 . 80 is a heating mirror 82 with heating surfaces 84 . 86 arranged, with the profile piece 72 and the pressure piece 54 at the heating surface 84 and the profile piece 80 and the pressure piece 36 at the heating surface 86 issue. The clamping elements 8th . 10 be in the direction of the heating mirror 82 biased.

8th shows a plan view of the device 2 at the end of melting.

The profile pieces 72 . 80 have shortened the burnup. This is done by feeding the clamping elements 8th . 10 on the heating mirror 82 compensated so that the profile pieces 72 . 80 continue on the heating mirror 82 issue. The bias springs 46 . 48 were compressed accordingly.

9a shows a plan view of the device 2 after removal of the heating mirror 82 in a first variant.

In this first variant are the plungers 36 . 54 flush with the joining sides 74 . 87 the profile pieces 72 . 80 aligned.

The pressure piece 54 has a displacement direction z, which is an angle α to the first profile longitudinal direction b of the profile bar 72 of about 22.5 °. In other embodiments, the angle α may be between 0 ° and 45 °, in particular between 0 ° and 22.5 °, in particular between 10 ° and 22.5 °, in particular 22.5 °. The pressure piece 36 has a displacement direction a, which is an angle to the second profile longitudinal direction c of the profile bar 80 of about 22.5 °.

The displacement directions z, a are each conditioned by a feed of the pressure pieces 54 . 36 in the direction of Profilstablängsrichtungen b, c and the force of the biasing elements 50 . 52 on the plungers 54 . 36 causes.

By the displacement directions z, a is a flipping a Schweißwulst to the profile bars 72 . 80 conditioned internally.

9b shows a plan view of the device 2 after removal of the heating mirror 82 in a second variant.

In this second variant, the pressure pieces are on the joining sides 74 . 87 into the respective joining directions x, y. As a result, the respective guide projections come 38 . 56 with the respective opposite Prüfilstücken 72 . 80 in contact and can there if necessary fold over plastic bulges inside.

10 shows a plan view of the device 2 during the joining process.

The pressure pieces 36 . 54 collide with each other and thereby become corresponding to a joining plane 88 pushed back. Through the guide projections 38 . 56 slide the pressure pieces 36 . 54 easy on the profile pieces 72 . 80 ,

The pressure pieces 36 . 54 Form a closed Inneneckkontur and thereby prevent deformation of a through the profile pieces 72 . 80 formed inner corner 90 ,

11 shows an enlarged perspective view of the pressure piece 54 ,

The leadership advantage 56 is in a direction transverse to the joining direction x and transverse to the displacement direction z.

12 shows a further embodiment of a device 2 '' with two inner corner tools 24 . 92 per profile piece 72 ,

13 shows an enlarged perspective view of the guide of a pressure piece 54 on the profile piece 72 ,

Through the leadership lead 56 there is a gap 94 between pressure piece 54 and profile piece 72 ,

LIST OF REFERENCE NUMBERS

2, 2 ', 2' '

contraption

4

first profile beam

6

second profile carrier

8th

first clamping element

10

second clamping element

12, 14

edition

16, 18

attack

20, 22

mitred

24

first inner corner tool

26

second inner corner tool

28, 30

guide housing

32, 34

bolt

36

Pressure piece

37.1, 37.2

linear pressure piece stop

38

guide projection

40

admission

42, 42 '44, 44'

pivot

46, 48

 biasing member

50, 52

 biasing member

54

Pressure piece

56

guide projection

58.1, 58.2

Pressure piece stop for pivoting

60.1

carriages

60.2

guide rail

62

guide rail

64, 66

biasing spring

72

first profile piece

74

first joining side

76

contact surface

80

second profile piece

82

heating mirror

84, 86

heating surface

87

second joining side

88

joining plane

90

inside corner

92

upper inner corner tool

94

gap

α

angle

a

second displacement direction

b

first profile longitudinal direction

c

second profile longitudinal direction

x

first joining direction

y

second joining direction

z

first displacement direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102012112533 A1 [0003, 0004]
• DE 202015000908 U [0008]

Claims (16)

Device for connecting at least two profile pieces ( 72 . 80 ) made of plastic, with - at least one in a first joining direction (x) movable clamping element ( 8th ) for clamping a first profile piece ( 72 ), - a heating element ( 82 ), which has at least one heating surface ( 84 . 86 ) having at least one joining side ( 74 ) at least one of the profile pieces ( 72 . 80 ) is brought into contact to at least one of the profile pieces ( 72 . 80 ) on its joining side ( 74 ) before joining with the other profile piece ( 72 . 80 ), and - at least one inner corner tool ( 24 ) for editing an inner corner ( 90 ) at least one of the profile pieces ( 72 . 80 ), wherein the at least one inner corner tool ( 24 . 26 ) a pressure piece ( 54 ), characterized in that the pressure piece ( 54 ) for processing the inner corner ( 90 ) is movable in a first displacement direction (z) having an angle (α) between 0 ° and 45 ° with respect to a first profile longitudinal direction (b). Apparatus according to claim 1, characterized in that the angle (α) between 0 ° and 22.5 °, in particular between 10 ° and 22.5 °, in particular 22.5 °. Apparatus according to claim 1 or 2, characterized in that the pressure piece ( 54 ) a guiding projection ( 56 ) which in the first displacement direction (z) over the remaining pressure piece (z) 54 ) stands out. Device according to one of the preceding claims, characterized in that the inner corner tool ( 24 ) a guided tour ( 28 ), with which the pressure piece ( 54 ) is guided, wherein the pressure piece ( 54 ) at the leadership ( 28 ) in the first displacement direction (z) against at least one biasing element ( 46 ) is supported. Device according to one of the preceding claims, characterized in that the pressure piece ( 54 ) at the leadership ( 28 ) in the first displacement direction (z) in the direction of the first profile piece ( 72 ) against at least one biasing element ( 50 . 52 ) is supported. Device according to one of the preceding claims, characterized in that, the inner corner tool ( 24 ) a storage ( 42 ), on which the pressure piece ( 54 ) is pivotally mounted, wherein a pivot axis of the storage ( 42 ) perpendicular to a support surface ( 12 ) of the clamping element ( 8th ) runs. Device according to one of the preceding claims, characterized in that the pressure piece ( 54 ) on the clamping element ( 8th ) is guided in a sliding manner. Device according to one of the preceding claims, characterized in that the pressure piece ( 54 ) a contact surface ( 76 ) for contact with the heating surface ( 84 . 86 ) having. Device according to one of the preceding claims, characterized in that the clamping element ( 8th ) a miter edge ( 22 ), wherein the contact surface ( 76 ) of the pressure piece ( 54 ) not on the miter edge ( 22 protrudes). Device according to one of the preceding claims, characterized in that at least one pressure piece stop for pivoting ( 58.1 . 58.2 ) for adjusting the stroke of the pressure piece ( 54 ) about a journal ( 42 ' ) is provided in the first displacement direction (z). Device according to one of the preceding claims, wherein linear pressure piece stop ( 37.1 . 37.2 ) is arranged such that the contact surface ( 76 ) of the pressure piece ( 54 ) in stop position in a line with the miter edge ( 22 ) or that the contact surface of the pressure piece ( 54 ) over the miter edge ( 22 ) protrudes in the first profile bar direction (b). Device according to one of the preceding claims, characterized in that the guide projection ( 56 ) has a rounded contact contour. Device according to one of the preceding claims, characterized in that a second clamping element ( 10 ) is provided, which is movable in a second joining direction (y), wherein the second joining direction (y) is perpendicular to the first joining direction (x). Device according to one of claims 1 to 12, characterized in that a second clamping element ( 10 ) is provided, which is fixed in the second joining direction (y). Device according to claim 13 or 14, characterized in that on the second clamping element ( 10 ) a pressure piece ( 36 ) is mounted, which according to the pressure piece ( 54 ) of claims 1 to 11 executed and is movable. Device according to one of the preceding claims, characterized in that on one or both of the clamping elements ( 8th . 10 ) an inner corner tool ( 24 ) and / or an upper inner corner tool ( 92 ) is attached.

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