EP3354428B1 - Cutting machine with two hot wires - Google Patents

Description

Technical area

The field of the invention is that of hot wire cutting machines used in particular on construction sites of buildings to cut polystyrene insulation panels.

Prior art

A hot-wire cutting machine is known from the patent document DE202013005772 .

This hot-wire cutting machine comprises a frame for carrying a cutting board, a cutting-bar fixed to the frame and having two opposite parallel sides between which the cutting wire is stretched and a cable-and-pulley operating mechanism. interior of the arch to move the tensioned wire along a certain cutting direction perpendicular to the frame.

The hoop can be pivotally attached to the frame to make different bevel cuts.

Presentation of the invention

The object of the invention is to improve such a hot-wire cutting machine to easily make more different cuts.

For this purpose, the subject of the invention is a hot-wire cutting machine comprising a frame which extends in a plane for flattening a panel to be cut, a cutting structure fixed to the frame and on which the wire is stretched. cutter, characterized in that the cutting structure is a four-sided frame between which are stretched two cross-cutting threads, and in that this frame is fixed inside the frame in two attachment points offset on a line which passes through the frame.

• les points de fixation peuvent être des pivots déportés sur lequel le cadre est monté rotatif à l'intérieur du châssis ;
• le cadre peut être un cadre rectangle avec deux petits côtés parallèles entre lesquels est tendu un premier fil de coupe qui s'étend parallèlement au plan du châssis et deux grands côtés parallèles entre lesquels est tendu un second fil de coupe qui s'étend à travers le plan du châssis ;
• un mécanisme d'actionnement, par exemple à câbles et poulies, peut être prévu à l'intérieur du cadre pour déplacer lesdits premier et second fils de coupe selon deux directions de coupe orthogonales ;
• le châssis peut comporter un piètement escamotable formant un chevalet ou encore des crochets de suspension.

The hot-wire cutting machine according to the invention may have the following particularities:

• the fixing points may be remote pivots on which the frame is rotatably mounted inside the frame;
• the frame can be a rectangle frame with two small parallel sides between which is stretched a first cutting wire which extends parallel to the plane of the frame and two large parallel sides between which is stretched a second cutting wire which extends through the plan of the chassis;
• an actuating mechanism, for example with cables and pulleys, can be provided inside the frame for moving said first and second cutting wires in two orthogonal cutting directions;
• the frame may comprise a retractable base forming an easel or suspension hooks.

With the arrangement according to the invention, it is possible to easily produce, without removing the panel of the frame, several cuts, in particular U-shaped cuts, in the three dimensions (thickness, width, length) of the panel.

In particular, with the second cutting wire which is stretched between the two large parallel sides of the frame of the cutting structure, it is possible to make along the length of a polystyrene insulation panel 250 cm long by 120 cm wide. , a U-shaped cutout over more than 120 cm in length.

Brief description of the drawings

• la figure 1 est une vue schématique de la machine de découpe à double fil chaud selon l'invention ;
• la figure 2 est une vue schématique de la machine de découpe selon l'invention avec un panneau découpé dans l'épaisseur et dans la largeur du panneau ;
• la figure 3 est une vue schématique de la machine de découpe selon l'invention avec un panneau découpé en biais dans la longueur du panneau ;
• la figure 4 illustre partiellement le mécanisme d'actionnement des deux fils chauds selon deux directions orthogonales ;
• la figure 5 illustre la machine de découpe selon l'invention en position repliée.

The present invention will be better understood and other advantages will appear on reading the detailed description of an embodiment taken by way of non-limiting example and illustrated by the appended drawings, in which:

• the figure 1 is a schematic view of the hot double wire cutting machine according to the invention;
• the figure 2 is a schematic view of the cutting machine according to the invention with a panel cut in the thickness and in the width of the panel;
• the figure 3 is a schematic view of the cutting machine according to the invention with a panel cut at an angle in the length of the panel;
• the figure 4 partially illustrates the actuation mechanism of the two hot wires in two orthogonal directions;
• the figure 5 illustrates the cutting machine according to the invention in the folded position.

Description of the embodiments

On the figure 1 , the hot double wire cutting machine according to the invention comprises a frame 1 which extends in a plane to flatten a cutting board (not shown on the drawing). figure 1 ), for example a polystyrene insulation panel for the insulation of buildings.

The frame 1 is here a tubular frame for example made of aluminum forming a rectangular frame which is mounted on a retractable base 2 in the form of easel adjustable in height.

On the figure 1 , the frame is in an inclined position for work on scaffold for example.

The frame can also be provided with suspension hooks 3 (only one being clearly visible on the figure 1 ) to be suspended for example from the guard of a basket.

According to the invention, inside the frame 1 is fixed a cutting structure 4 forming a frame, in particular a rectangular frame, to carry two cutting son 5,6 which intersect.

The frame of the cutting structure is fixed inside the frame in two attachment points P1 and P2 offset on a line L which passes through the frame.

More particularly and as visible on the figure 1 , the fixing points P1, P2 between the two opposite small sides 1A, 1B of the frame and the two opposite small sides 4A, 4B of the cutting structure are offset on a line L which passes between the two opposite large sides 1C, 1D of the frame and the two opposite large sides 4C, 4D of the cutting structure.

These two attachment points P1, P2 are preferably offset pivot points to allow the frame of the cutting structure to occupy different angular positions relative to the plane of the frame so as to make bevel cuts in the panel or to retract completely the cutting structure inside the chassis frame.

We have shown on the figure 1 , the rectangle frame 4 of the cutting structure with the two small parallel opposite sides 4A, 4B between which is stretched the first cutting wire 5 which extends parallel to the plane of the frame and the two large opposite sides parallel 4C, 4D between which is stretched the second cutting wire 6 which extends through the plane of the frame and which crosses the cutting wire 5 here at right angles without contact with it.

In practice the offset of the two pivot points P1, P2 is a few centimeters, for example 3 cm, from the long side 4D of the frame of the cutting structure so that the second cutting wire 6 completely through the plane of the frame.

The short sides 4A, 4B of the frame of the cutting structure have a length of about 50 cm to provide a cutting depth of about 40 cm while the long sides 4C, 4D of the frame of the cutting structure can have a length of about 150 cm to obtain a cutting length of 135 cm.

The rotation of the frame 4 of the cutting structure in the chassis frame is symbolized by the double arrow P on the figure 1 .

We also illustrated on the figure 1 , an angle 7 for holding in horizontal or inclined position the panel to be cut on the frame, this bracket 7 being mounted tilting in the plane of the frame to make cuts at an angle.

The reference 8 designates a protractor of the angle of inclination of the angle 7 in the plane of the frame.

As visible on the figure 1 , the angle 7 passes through the plane of the frame 4 of the cutting structure. It is sectioned opposite the line L offset of the pivot points P1, P2 to allow the passage of the second cutting wire 6 over the entire height of the frame 4 of the cutting structure.

On the figure 2 a polystyrene insulation board 9 is shown in the hot double wire cutting machine according to the invention.

In this figure, the angle 7 is horizontal and the panel 9 extends horizontally along its great length in the angle 7.

On the figure 2 there is illustrated a groove 10 which has been made across the width of the panel with the cutting wire 5 stretched substantially vertically.

To achieve this groove 10, the cutting wire 5 is moved from the front to the rear of the frame with the frame 4 of the cutting structure at 90 ° relative to the plane of the frame. Then the panel 9 is moved from right to left on the figure 2 while the cutting wire 5 is stationary in the cutting structure.

There is also illustrated a U-shaped cut 11 which has been made along the length of the panel with the cutting wire 6 stretched substantially horizontally.

To make this notch 11, the cutting wire 6 is moved up and down. Then the panel is moved from right to left on the figure 2 while the cutting wire 6 remains stationary. Finally the cutting wire 6 is moved upwards, the panel being stationary on the frame 1.

The figure 3 illustrates yet another U-shaped cut 12 made obliquely in the panel 9 with the cutting wire 6.

The frame 4 of the cutting structure is inclined here at 45 ° with respect to the plane of the frame 1.

The cutting wire 6 is positioned here at half height in the frame 4.

The panel 9 is moved from left to right on the figure 3 . Then the cutting wire 6 is moved from the bottom to the top, the panel 9 remaining stationary on the frame 1. Then finally the panel 9 is moved from the right to the left on the figure 3 , the cutting wire 6 remaining stationary in the frame 4.

On the figure 4 , there is illustrated a cable mechanism 12 and pulleys 13 for moving the cutting son 5 and 6 which intersect in the frame 4 of the cutting structure.

The cutting son 5 and 6 can be moved each with a slider such as 14 sliding on a slide bearing a millimeter mark.

The cutting wires 5 and 6 can be heated by an electric current flowing in a copper track 15 bonded inside the frame 4 which is profiled.

The electric current can be stored in a battery attached to the chassis.

The two cutting wires 5 and 6 intersect without contact between them. They move respectively in two parallel planes of the frame 4 separated by 1 cm between them for example.

The figure 5 illustrates the hot double wire cutting machine according to the invention in the folded position when the frame 4 of the cutting structure is retracted into the frame of the frame 1.

In this folded position, the cutting machine according to the invention is very compact.

It can be suspended vertically to the bodyguard of a shallow gondola.

This hot double wire cutting machine according to the invention is compact because the two cutting wires are movable in a single frame of the cutting structure. The double hot wire cutting machine according to the invention can be manufactured at low cost in welded metal tubes for example.

Claims (5)

1. A hot-wire cutter machine comprising a mount (1) that extends in a plane in order to carry flat a panel (9) for cutting, and a cutter structure (4) fastened to the mount and having the cutter wire tensioned thereon, the machine being characterized in that the cutter structure is a frame having four sides (4A, 4B, 4C, 4D) between which two crossed cutter wires (5, 6) are tensioned, and in that the frame is fastened inside the mount at two fastening points (P1, P2) that are offset on a line (L) that crosses the frame.
2. The hot-wire cutter machine according to claim 1, characterized in that the fastening points (P1, P2) are offset pivots on which the frame is mounted to turn inside the mount.
3. The hot-wire cutter machine according to any preceding claim, characterized in that the frame (4) is a rectangular frame having two mutually parallel short sides between which a first cutter wire (5) is tensioned that extends parallel to the plane of the mount, and two mutually parallel long sides between which a second cutter wire (6) is tensioned that extends across the plane of the mount.
4. The hot-wire cutter machine according to claim 3, characterized in that it includes an actuator mechanism inside the frame (4) for moving said first and second cutter wires (5, 6) in two orthogonal cutting directions.
5. The hot-wire cutter machine according to any preceding claim, characterized in that the mount includes a retractable stand (2) forming an easel, or indeed suspension hooks (3).

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