Hot wire cutting device and use of a hot wire cutting device for cutting foam

Abstract

The invention relates to a hot-wire cutting device for thermally cutting a workpiece made of a foam, in particular XPS and / or polystyrene foam, comprising an electrically heated cutting wire (131) and a workpiece holder (105, 305) for receiving the workpiece. A contour cut in the workpiece can be performed by means of a guided movement of the electrically heated cutting wire relative to the workpiece holder, thereby locally melting the workpiece. The first and second cutting wire holders are mounted on respective first swivel arms (119), and each first swivel arm is associated with a respective second swivel arm (117). A projection device for projecting a desired cutting direction (181) onto the workpiece is associated with the first and / or second cutting wire holder.The projection device comprises a laser pointer, a line projection, a shape projection, and / or a stencil projection, wherein a light point, a light line, a light shape, and / or stencil illumination can be projected onto the workpiece. The use of a mechanical stencil is also provided for. Furthermore, the invention relates to the use of the hot wire cutting device.

Description

[0001] The invention relates to a hot-wire cutting device for thermally cutting a workpiece made of a foam, in particular of an XPS, a plastic rigid foam and / or of a polystyrene foam, with an electrically heatable cutting wire tensioned in a first cutting wire holder and a second cutting wire holder along a cutting wire alignment and a workpiece holder for receiving the workpiece, wherein a contour cut can be carried out in the workpiece by means of a guided movement of the electrically heated cutting wire relative to the workpiece holder by means of a local melting of the workpiece, the first cutting wire holder and the second cutting wire holder are received on a respective first pivot arm and a respective second pivot arm is assigned to the respective first pivot arm,the respective first pivot arm is connected to the respective second pivot arm by means of a respective first pivot joint with a respective first pivot axis arranged substantially parallel to the cutting wire alignment, and the respective second pivot arm is connected to the tool holder by means of a respective second pivot joint with a respective second pivot axis arranged substantially parallel to the cutting wire alignment, such that by pivoting the respective first pivot arm and / or the respective second pivot arm about the respective pivot axis, guiding the cutting wire in a cutting direction arranged substantially orthogonal to the cutting wire alignment is possible. The invention further relates to the use of such a hot wire cutting device for cutting foam.

[0002] Known hot wire cutting devices, which are used for thermal cutting of extruded polystyrene (XPS) or polystyrene foam, for example, are equipped with a complex CNC control, can only be used stationary or are complicated in design.

[0003] Hot wire cutting devices are also known which can be carried by a person, but their use is limited to cutting, for example, polystyrene with a vertical, straight cut and which are difficult to transport.

[0004] The generic document DE 20305495 U1 discloses a cutting device for plastic sheets, which has pivoting arms and a coupling between two pivoting arm assemblies. Guides are used to guide the respective pivoting arm assemblies for contour cuts.

[0005] DE 10 2009 052 652 A1 describes a mobile cutting device. Pivoting arms and a bracket are used to guide a cutting wire.

[0006] DE 29800994 U1 relates to a cutting device for thermally cuttable material. A heating wire can be guided along templates to cut the material.

[0007] DE 20 2007 005 800 U1 discloses a hot-wire cutting device. A heating wire can be guided in a linear guide.

[0008] DE 20 2011 100 625 U1 relates to a portable cutting device. A cutting wire is guided in templates. The material to be cut is placed on a base plate. Shape templates for guided cuts are also disclosed.

[0009] The object of the invention is to improve the state of the art.

[0010] The object is achieved by a hot-wire cutting device, in particular made of an XPS, a plastic rigid foam and / or a polystyrene foam, according to claim 1.

[0011] By arranging the first cutting wire holder and the second cutting wire holder on a respective first pivot arm and a second pivot arm coupled thereto, pivoting the respective first pivot arm and / or the respective second pivot arm about the respective pivot axis enables the cutting wire to be guided in a cutting direction substantially orthogonal to the cutting wire orientation. This creates a defined yet easily adjustable guide for the cutting wire, which easily enables processing, for example, a piece of foam or rigid plastic foam held on the workpiece holder.

[0012] The projection device enables a desired cutting direction to be projected, allowing, for example, freehand guidance of the cutting wire along the desired cutting direction based on the projection, so that the hot-wire cutting device according to the invention can also be used without templates. By eliminating templates, a particularly compact hot-wire cutting device can be provided. Such a projection device can also be attached to the handle and can support manual guidance in the form of a cutting indicator, allowing the cutting wire to be guided as precisely as possible along a line marked manually, for example, on the foam. This allows free-form shapes, in particular, to be designed particularly easily.

[0013] The following terms are explained in this context: A "hot wire cutting device" is designed in such a way that a cutting wire, heated for example by means of an electric current, is moved through a thermally meltable foam or rigid plastic foam, thereby making it possible to perform a so-called contour cut in the workpiece.

[0014] "Thermal cutting" of a workpiece describes in particular the passing through of a heated "cutting wire", for example a metallic wire which is heated by means of electrical voltage, so that the heated cutting wire melts the workpiece locally in the area of the cutting wire and thus enables "cutting", i.e. separating materials from one another.

[0015] A "workpiece" is formed, in particular, from a foam material, such as extruded polystyrene (XPS) or a comparable foam. The materials used have thermoplastic properties and / or are meltable, enabling cutting using a heated cutting wire. Such hot-wire cutting devices are also commonly known as "hot wire." A respective "cutting wire holder" serves to mechanically hold the cutting wire, which is then tensioned between the cutting wire holders along a "cutting wire alignment," i.e., a longitudinal alignment of the cutting wire.

[0016] A "workpiece holder," which can be configured, for example, as a table, mold holder, or mechanical support for a workpiece, serves to "hold" the workpiece, i.e., to position and / or fix the workpiece in the workpiece holder such that the position of the workpiece in the workpiece holder is known and, in particular, immutable. For example, such a workpiece holder can also include clamping devices, mechanical stops, or hold-down devices so that the workpiece is immovably held on the workpiece holder, especially during processing.

[0017] A "guided movement" of the electrically heated cutting wire refers to a movement that is particularly guided relative to the workpiece holder, which is carried out, for example, by an operator or semi-automatically along a desired cutting contour, so that in particular a defined position of the cutting wire relative to the workpiece holder and thus relative to the workpiece is ensured at all times.

[0018] The "local melting" of the workpiece takes place as described above, using the heat of the cutting wire, so that the result is a "contour cut", i.e. a separation along a correspondingly multi-dimensional, contour-guided cut in the workpiece.

[0019] A "pivoting arm" refers to a rigid arm or a rigid mechanical element that is movably arranged around a pivot point, namely a respective "pivoting joint," particularly in a defined pivoting plane. The arrangement of several coupled pivoting arms enables the cutting wire to be guided relative to the workpiece within the desired contours. Each pivoting joint is equipped with a respective "pivoting axis," i.e., a movement axis and / or rotation axis. In this context, it should be noted that "guiding" a cutting wire refers to the specific process of, for example, manually moving the cutting wire along the contour cut, i.e., specifically, describing a defined movement of the cutting wire.

[0020] In this context, "essentially orthogonal to the cutting wire alignment" refers to guiding the cutting wire within the degrees of freedom provided by the arrangement of the pivot arms, allowing, for example, the respective first pivot arms and respective second pivot arms to be interlaced to guide the cutting wire at an angle relative to, for example, a neutral cutting wire alignment. "Substantially" in this case encompasses deviations of up to +30 degrees to -30 degrees. The angle specifications refer to a full angle of 360 degrees.

[0021] In this context, a "projection device" is a device that enables the emission of light in such a way that a "desired cutting direction," for example, a specified contour, is visible to the operator on the workpiece. "Projecting" refers to the actual emission of light, thereby creating a desired cutting direction on the workpiece. The desired cutting direction is conceptually synonymous with a cutting position, a desired cutting position, a light signal, or a specific projection, and is intended to clarify that a specified contour is projected for the operator.

[0022] According to one embodiment, the desired cutting direction can be projected onto a workpiece side facing the respective cutting wire holder and / or onto the respective cutting wire holder by means of the projection device. This allows the desired cutting direction to be projected directly in the area where the cutting wire enters the workpiece on the respective side, allowing the operator to directly follow the desired cutting direction in the form of the projection.

[0023] A "workpiece side facing the respective cutting wire holder" is one of the two workpiece sides facing the cutting wire holder and thus also facing a respective end of the cutting wire. The "workpiece side" is synonymous with a corresponding workpiece contour and does not need to be geometrically known or defined.

[0024] According to a further embodiment, the projection device comprises a laser pointer, a line projection, a shape projection and / or a template projection, wherein a light point, a light line, a light shape and / or a template illumination can be projected onto the workpiece.

[0025] A "laser pointer" is a device for emitting a "point of light," i.e. a spatially limited light phenomenon on the workpiece, so that, for example, a starting point, an end point, or a punctual course of the desired cutting direction or the desired cutting contour can be displayed.

[0026] A "line projection", which projects a "light line", i.e. a spatially extended light phenomenon, is used, for example, to display the course of the desired contour so that an operator can plan steps and carry out movements in advance.

[0027] A "form projection," for example, projects "light shapes," i.e. complex structures made up of light points and lines.

[0028] A "stencil projection" is created, for example, by means of an illuminated stencil, so that a "stencil illumination", i.e. an inverse illumination to create the effect of a shadow with an equally illuminated shadow surface, can be created.

[0029] In order to ensure a specific geometric assignment of the projection device to the workpiece, the projection device is in particular mechanically fixed in the workpiece holder or the workpiece holder, wherein the projection device is in particular received in such a way that the projection of the desired cutting direction takes place essentially along the cutting wire alignment.

[0030] "Mechanically fixed" refers in particular to a mechanical attachment, for example, a form-fitting and / or force-fitting attachment of the projection device to the workpiece holder in such a way that relative movement due to conventional operating forces is impossible. The production device can be attached either to the workpiece holder, for example, by means of a clamp, or in the workpiece holder, for example, embedded in a table used to hold the workpiece.

[0031] Projecting the cutting direction "essentially along the cutting wire alignment" occurs with technically possible deviations, for example, at an angle of up to 45 degrees. This allows, for example, the illumination of a workpiece flank positioned vertically on a table used for workpiece support to be illuminated from the table at an angle of up to 45 degrees, allowing the operator to perceive the corresponding light contour on the workpiece. This allows the hot wire cutting device according to the invention to be designed particularly compactly.

[0032] The design with a first swivel arm and a second swivel arm, which are arranged, for example, on both sides of the workpiece holder and thus on both sides of the workpiece and form a swivel frame, makes it possible to carry out any prismatic, conical or similarly shaped shapes as a contour cut on the workpiece.

[0033] Using one or more templates, which are arranged, for example, on one or both sides of the workpiece, a corresponding guide contour can be created, which enables the first cutting wire holder and / or the second cutting wire holder to be guided along the respective template. This allows precise contour cuts to be created along the template. Alternatively, or in addition to this, linear guides or a linear guide for a corresponding axis can be used to make particularly straight cuts, for example.For this purpose, a template aligned substantially parallel to the cutting direction or a plurality of templates aligned substantially parallel to the cutting direction with a respective guide contour is or are assigned to the workpiece holder, wherein the respective cutting wire holder can be brought into contact with the respective template on the guide contour, so that when the respective cutting wire holder is in contact with the template, guiding the first cutting wire holder and / or the second cutting wire holder along the respective template is possible.

[0034] A "template" is, in particular, a mechanical template made of a flat material such as plywood, cardboard, or metal, which allows the "guide contour" in the template to be followed, i.e., a desired contour analogous to the contour cut. To do this, the respective cutting tool holder is brought into contact with the respective template on the guide contour, i.e., guided along the guide contour.

[0035] According to a further embodiment, a linear guide aligned substantially parallel to the cutting direction or a plurality of linear guides aligned substantially parallel to the cutting direction is or are assigned to the workpiece holder, wherein the respective linear guide or the respective linear guides can be brought into engagement with the respective cutting wire holder, so that when the respective cutting wire holder is in engagement with the linear guide or with the linear guides, guiding of the first cutting wire holder and / or the second cutting wire holder along a linear axis of the linear guide is possible.

[0036] This means that, for example, geometrically predefined shapes such as straight cuts can be carried out particularly reliably.

[0037] In this context, a "linear guide" refers to a mechanical, particularly form-fitting guide that provides linear, straight guidance of the respective cutting wire holder. For example, such a linear guide is a U-shaped or C-shaped rail that can engage a corresponding component of the respective cutting wire holder.In order to be able to combine the advantages of the projection device, templates and / or a linear guide or several linear guides, the projection device projects a first partial section of the desired cutting direction onto the workpiece, so that a second partial section of the desired cutting direction is carried out by guiding the respective cutting wire holder along the guide contour of a template and / or a third partial section of the desired cutting direction along the respective linear axis of the respective linear guide, so that a combined guiding of the cutting wire by means of a freehand guide based on the projected desired cutting direction, a template and / or a linear guide is possible.

[0038] This means, for example, that a cut intended for a contact surface on another component can be carried out particularly precisely and in a form-analogous manner using a linear guide and / or a template, while more complicated shapes or changing shapes are projected using the projection device in such a way that freehand guidance based on the projection is possible.

[0039] If the respective pivoting arms are mechanically coupled to one another by means of a respective coupling device, so that, for example, a closed pivoting frame is formed, parallel guidance of the cutting wire is possible, for example, for precisely prismatic workpiece shapes. For this purpose, the respective first pivoting arms and / or the respective second pivoting arms are mechanically coupled to one another by means of a coupling device, so that by means of a mechanically coupled pivoting of the first pivoting arms and / or by means of a mechanically coupled pivoting of the second pivoting arms about the respective pivot axis, the cutting wire can be guided in a cutting direction arranged essentially orthogonal to the cutting wire orientation.

[0040] In particular, a further compact hot wire cutting device can be provided, since, for example, by means of a correspondingly rigid coupling of the respective pivot arms to one another, a deviation of the first cutting wire holder from parallelism in relation to the second cutting wire holder can be avoided as best as possible.

[0041] According to one embodiment, the first pivot arms or the second pivot arms are synchronously coupled to one another by means of a synchronization device, so that by means of a synchronously coupled pivoting of the first pivot arms and / or by means of a synchronously coupled pivoting of the second pivot arms about the respective pivot axis, a parallel guidance of the cutting wire in a cutting direction arranged substantially orthogonal to the cutting wire alignment is possible. This makes it possible, for example, to completely dispense with a second projection device in relation to a first projection device to ensure parallelism.

[0042] A "synchronous device" is a mechanical coupling, for example through a particularly rigid coupling device and / or a cable guide, a gear arrangement or a similarly acting device, so that the respective swivel arms can move "synchronously" to each other, i.e. are guided geometrically parallel to each other.

[0043] The effective weight of the pivoting frame on the cutting wire can be reduced to zero by a lever mechanism and the corresponding counterweight. According to one embodiment, a compensating device can be mechanically assigned to the respective pivoting arm or arms, wherein the weight force of the respective pivoting arm, the respective cutting wire holder and / or the cutting wire is compensated by means of one or more spring elements of the compensating device. The compensating device has, in particular, a spring-loaded balancer, a gas pressure spring or several gas pressure springs and / or one or more leg springs, so that the compensation of the weight force enables essentially force-free movement of the cutting wire.

[0044] Alternatively, a soft coupling can be achieved using the coupling device, so that, for example, only a certain deviation from parallelism is permitted.

[0045] According to one embodiment, a cutting wire holder or the respective cutting wire holder is assigned a handle for manually guiding the cutting wire.

[0046] According to a further embodiment, a control device is assigned to the cutting wire, wherein by means of the control device a control and / or regulation of a temperature of the cutting wire can be set by means of a regulation of an electrical current supplied to the cutting wire, wherein the setting of the temperature on the control device is made possible in particular manually by an operator by means of a manual default value and / or by means of an automatic default value specified by a marking on the workpiece.

[0047] A "manual preset value" can be set by an operator using a potentiometer or switch, for example, whereby a number of manual preset values can be specified in order to be able to process common materials with the respective temperatures of the cutting wire, for example.Likewise, a marking on the workpiece, for example a barcode, a QR code or equivalent markings, can be provided, wherein an automated or semi-automated reading of an associated automatic default value takes place by scanning the corresponding marking using a scanning device assigned to the control device, so that the temperature of the cutting wire is set accordingly for the corresponding material, in particular to a temperature between 0° Celsius and 800° Celsius, so that with a temperature adapted to the respective material, emissions due to the melting of the material by means of the cutting wire are avoided as best as possible.

[0048] If the hot-wire cutting device, in particular the workpiece holder, is arranged on a table, with the table having foldable table legs, the hot-wire cutting device can be stored particularly compactly. In particular, the workpiece holder has a respective swivel arm holder, or a respective swivel arm holder is assigned to the workpiece holder, so that the swivel arm or swivel arms can be placed in a rest position in the respective swivel arm holder.

[0049] In a further aspect, the object is achieved by the use of a hot wire cutting device according to one of the previous embodiments for cutting foam, in particular for cutting plastic rigid foam, XPS and / or polystyrene foam, in particular expanded polystyrene (EPS).

[0050] A hot wire cutting device according to the invention can thus be used for cutting, for example, decorative strips or decorative profiles made of extruded polystyrene (XPS) and / or polystyrene foam, which is also known as "Styrofoam".

[0051] The invention will be explained in more detail below using exemplary embodiments. Figure 1 is a schematic representation of a cutting device in an isometric view, and Figure 2 is a schematic representation of a template for the cutting device of the Figure 1 in an isometric view.

[0052] A cutting device 101 has a table 103. The table 103 has a tabletop 105 and foldable table legs 107 attached to joints 109. On the bottom side, the table legs 107 each have a rubber foot 111.

[0053] A holding arm 115 is attached to a holder 113 at a rear edge 112, and specifically to the left and right sides of a Styrofoam workpiece 150 held on the table top 105, as viewed from an operator (not shown) standing at a front edge 114.

[0054] On both the left and right sides of the workpiece 150, a first pivot arm 117 is pivotally coupled to a joint 116 on the holding arm 115, and a pivot arm 119 is pivotally coupled to a further joint 118 attached to the pivot arm 117. At the free end of the pivot arm 119, a cutting wire 131 is received in a clamp integrated into a respective handle 133, which clamp is thereby tensioned between the left- and right-hand pivoting mechanisms of the respective pivot arms. The cutting wire 131 can be heated with electrical current; however, the corresponding arrangement is not shown for reasons of clarity. The arrangement (not shown) further comprises a control device by means of which a current flow to the cutting wire 131 can be adjusted. Thus, a temperature setting can be selected manually or, for example, by means of a barcode attached to the workpiece 150 using a scanner.To clean the cutting wire 131, it can be heated to maximum while not in contact with a workpiece, for example by pressing a switch button, and any remaining contaminants can thus be evaporated or burned.

[0055] In the end region of the respective pivot arms 119, the respective handle 133 is attached for manually guiding the cutting wire 131, so that the operator (not shown) can guide the cutting wire 131 on the left and right sides of the workpiece 150 by means of the respective handle 133.

[0056] A shaft 121 and, analogously, a shaft 123 are arranged between the respective joints 116 and, analogously, between the respective joints 118. The torsional rigidity of the respective shaft can thus be used to determine the extent to which the two pivot arm assemblies are synchronized in their movement or whether, for example, a certain degree of freedom of asynchrony is allowed for the movement of the respective clamping holder for the cutting wire 131 on both sides of the workpiece 150. The pivot arms can be held in a mechanically suspended state by means of a mechanical balancer or a leg spring in the joints (balancer not shown). In addition, the shafts 121 and 123 hold the respective pivot arms at a defined distance and thus also help to keep the cutting wire 131 under tension.

[0057] A projector 141 is also arranged on the tabletop 105, which projects a cutting contour 181 onto the workpiece 150 using a projection 142. In the example explained, the projection is designed as a light line contour. The operator can then guide the cutting wire 131 along the projected cutting contour 181 and thus cut off a corresponding shaped part of the workpiece 150 using the cutting wire 131.

[0058] Alternatively, a laser projector can be arranged on the table 103, the tabletop 105, the handle 133, or in the area of the pivot arm 119 or the shaft 123. This allows a laser spot to be projected onto the workpiece 150, which projects the position of the cutting wire onto the workpiece 150 in the form of a cutting indicator. In combination with the projector 131 and the projected cutting contour 181, the operator can cut very precisely. For this purpose, for example, the projection 142 and the aforementioned laser spot can be designed in different colors to enable differentiation.

[0059] Alternatively or additionally, a template 201 with a straight base surface 202 can be arranged on the tabletop 105 to the left and / or right of the workpiece 150 from the operator's perspective. The template 201 also has a contour 203, which corresponds, for example, to the desired cutting contour 181. By placing a part of the handle 133 on one or both sides of the workpiece 150, the cutting wire 131 can be securely guided along the contour 203, so that, for example, uniform repeat cuts can be performed on different workpieces on the tabletop 105. The template 201 can alternatively also have a straight edge or a straight section, or be replaced by a rod, so that precisely straight cuts can be performed.

[0060] A cutting device 301 with a table top 305 is equipped, analogously to the prescribed cutting device 101, with foldable table legs 307, which are attached to joints 309. Within the table top 305, a mechanical holder 304 is arranged directly next to a workpiece 350 held on the table 305, so that templates can be fixedly positioned analogously to the template 201. Furthermore, a projector 341 is embedded in the table top 305, which projects a projection 342 analogous to the projection 142 onto the workpiece 350, so that a cutting contour 381 is visible on the workpiece 350 and can be guided along the projected cutting contour 381 by means of a cutting wire (cutting wire arrangement not shown here).In particular, it is possible here on the cutting device 301 in combination with templates inserted into the holder 304 and the projected cutting contour 381, so that, for example, a straight contour of a template and a correspondingly more complicated shape can be cut using the projected cutting contour 381. List of reference symbols

[0061] 101Cutting device 103Table 105Table top 107Table leg 109Joint 111Foot 112Rear edge 113Holder 114Operator 115Holding arm 116Joint 117Pivot arm 118Joint 119Pivot arm 121Shaft 123Shaft 131Cutting wire 133Handle 141Projector 142Projection 150Workpiece 181Cutting contour 201Template 202Base area 203Contour 301Cutting device 304Holder 305Table top 309Joint 307Table leg 341Projector 342Projection 350Workpiece 381Cutting contour

Claims

1. Hot wire cutting device (101) for thermally cutting a workpiece (150) from a foam material, in particular from an XPS, a plastic rigid foam and / or from a polystyrene foam, with an electrically heatable cutting wire (131), tensioned between a first cutting wire receptacle (133) and a second cutting wire receptacle (133) along a cutting wire orientation, and a workpiece receptacle (105, 305) for receiving the workpiece (150), wherein a contour cut (181) can be made in the workpiece (150) by means of a guided movement of the electrically heated cutting wire (131) relative to the workpiece receptacle (105, 305), the first cutting wire receptacle (133) and the second cutting wire receptacle (133) are received on a respective first pivot arm (119) and the respective first pivot arm (119) is assigned a respective second pivot arm (117), the respective first pivot arm (119) is connected to the respective second pivot arm (117) by means of a respective first pivot joint (118) with a respective first pivot axis disposed substantially parallel to the cutting wire orientation and the respective second pivot arm (117) is connected to the workpiece receptacle (105, 305) by means of a respective second pivot joint (116) with a respective second pivot axis disposed substantially parallel to the cutting wire orientation, in such a way that, by pivoting the respective first pivot arm (119) and / or the respective second pivot arm (117) about the respective pivot axis, the cutting wire (131) can be guided in a cutting direction (181) disposed substantially orthogonal to the cutting wire orientation, characterised in that the first cutting wire receptacle (133), the cutting wire (131) and / or the second cutting wire receptacle (133) are assigned a projection means (141, 341) for projecting a desired cutting direction (181) onto the workpiece by means of an emission of light, so that the desired cutting direction is visible on the workpiece to an operator.

2. Hot wire cutting device according to claim 1, characterised in that the desired cutting direction (181, 381) can be projected by the projection means (141, 341) onto a workpiece side facing the desired cutting direction (181, 381) and / or onto the respective cutting wire receptacle (133) .

3. Hot wire cutting device according to claim 1 or 2, characterised in that the projection means (141, 341) has a laser pointer, a line projection, a shape projection and / or a template projection, wherein a light dot, a light line, a light shape and / or a template illumination can be projected onto the workpiece.

4. Hot wire cutting device according to any one of the preceding claims, characterised in that the projection means (141, 341) is fixed, in particular mechanically, on the workpiece receptacle (105, 305) or is received in the workpiece receptacle (105, 305), wherein the projection means (141, 341) is received in particular in such a way that the desired cutting direction (181, 381) is projected substantially along the cutting wire orientation.

5. Hot wire cutting device according to any one of the preceding claims, characterised in that the workpiece receptacle (105, 305) is assigned a template (201) oriented substantially parallel to the cutting direction (181) or a plurality of templates oriented substantially parallel to the cutting direction (181) with a respective guide contour (203), wherein the respective cutting wire receptacle (133) can be brought into engagement, with contact, with the respective template (201) at the guide contour (203), so that, when the respective cutting wire receptacle (133) is engaged with contact with the template (201), the first cutting wire receptacle (133) and / or the second cutting wire receptacle (133) can be guided along the respective template (201), and / or the workpiece receptacle (105, 305) is assigned a linear guide oriented substantially parallel to the cutting direction (181) or a plurality of linear guides oriented substantially parallel to the cutting direction, wherein the respective linear guide or the respective linear guides can be brought into engagement with the respective cutting wire receptacle (133), so that, when the respective cutting wire receptacle (133) is engaged with the linear guide or with the linear guides, the first cutting wire receptacle (133) and / or the second cutting wire receptacle (133) can be guided along a linear axis of the respective linear guide, wherein the projection device (141, 341) projects a first portion of the desired cutting direction (181, 381) onto the workpiece (150, 350), so that a second portion of the desired cutting direction (181, 381) is produced by guiding the respective cutting wire receptacle (133), is along the guide contour (203) of a template (201) and / or a third portion of the desired cutting direction is produced along the respective linear axis of the respective linear guide, so that a combined guidance of the cutting wire (131) is made possible by means of freehand guidance on the basis of the projected desired cutting direction (181, 381), a template (201) and / or a linear guide.

6. Hot wire cutting device according to any one of the preceding claims, characterised in that the respective first pivot arms (119) and / or the respective second pivot arms (117) are mechanically coupled to one another by a coupling means (121, 123), so that, by means of a mechanically coupled pivoting of the first pivot arms (119) and / or by means of a mechanically coupled pivoting of the second pivot arms (117) about the respective pivot axis, the cutting wire (131) can be guided in a cutting direction (181) disposed substantially orthogonal to the cutting wire orientation.

7. Hot wire cutting device according to any one of the preceding claims, characterised in that the first pivot arms (119) and / or the second pivot arms (117) are coupled to one another synchronously by a synchronisation means (121, 123), so that, by means of a synchronously coupled pivoting of the first pivot arms (119) and / or by means of a synchronously coupled pivoting of the second pivot arms (117) about the respective pivot axis, the cutting wire (131) can be guided in parallel in a cutting direction (181) disposed substantially orthogonal to the cutting wire orientation,8. Hot wire cutting device according to any one of the preceding claims, characterised in that the respective pivot arm (117, 119) or the respective pivot arms (117, 119) is / are mechanically assigned a compensation means, wherein, by means of a spring element or by means of a plurality of spring elements of the compensation means, the weight force of the respective pivot arm (117, 119), of the respective cutting wire receptacle (133) and / or of the cutting wire (131) is compensated, wherein the compensation means in particular has a spring-loaded balancer, a gas compression spring or a plurality of gas compression springs and / or a leg spring or a plurality of leg springs, so that a substantially force-free movement of the cutting wire (131) is made possible by means of the compensation of the weight force.

9. Hot wire cutting device according to any one of the preceding claims, characterised in that a cutting wire receptacle (133) or the respective cutting wire receptacle (133) is assigned a handle (133) for manually guiding the cutting wire (131).

10. Hot wire cutting device according to any one of the preceding claims, characterised in that the cutting wire (131) is assigned a control means, wherein an open-loop and / or closed-loop control of a temperature of the cutting wire (131) can be adjusted by the control means by controlling an electrical current supplied to the cutting wire (131), wherein the adjustment of the temperature at the control means can be implemented manually by an operator by means of a manual default value and / or by means of an automatic default value specified by a labelling on the workpiece.

11. Hot wire cutting device according to any one of the preceding claims, characterised in that the workpiece receptacle (105) is arranged on a table (103), wherein the table (103) has foldable table legs (107) in particular.

12. Hot wire cutting device according to any one of the preceding claims, characterised in that the workpiece receptacle (105) is assigned a respective pivot arm receptacle, wherein the respective pivot arms (117, 119) can be transferred into a rest position in such a way that the respective first pivot arm (119) and / or the respective second pivot arm (117) is arranged in the respective pivot arm receptacle in the rest position substantially parallel to a receptacle surface of the workpiece receptacle (105) and / or substantially parallel to a table surface of the table (105).

13. Use of a hot wire cutting device (101) according to any one of preceding claims 1 to 12 for cutting foam, in particular for cutting plastic rigid foam, XPS and / or polystyrene foam, in particular EPS.

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