DE3721861C2 - Method and device for producing a rectangular frame, in particular a window frame - Google Patents

Description

The invention relates to a method of manufacture len a rectangular frame, in particular a window frame, from a plastic profile, in which four plastic Mitred profile pieces cut to length and un ter use of interchangeable, the profile cross section appropriate supplements clamped in a welding machine and on all miter surfaces at the same time with heating and pressure are welded together and in which the emerging weld beads in a downstream plaster machine processed, as well as on a device for Execution of the procedure.

The manufacture of window frames or the like takes place until forth in such a way that the four parts of the frame from one Cut plastic profile in the specified length become. The length of each plastic profile piece is thereby by a predetermined dimension larger than the final dimension of the Frame, since the profile pieces against each other during the welding process be pressed. The individual, mitered Plastic profile pieces are successively made by hand inserted, aligned and inserted into the welding machine tense. About a welding mirror or a heating sword who which the plastic profiles then simultaneously on their go surfaces heated up to a predetermined temperature, which is so high that the miter surfaces are then un weld the formation of weld beads together.  

After the welding process, the window frame is attached to one Transfer roller conveyor and a cleaning machine leads. In the cleaning machine, the window frame is through Rotate 90 ° in succession at all four corners works, with the protruding weld beads in sight area to be removed. This known method has the Disadvantage that the removal of the individual plastic profile pieces from the cutting machine and the following one laying, aligning and clamping cumbersome and time-consuming bend is what affects the performance of the welding machine, however the cleaning machine is also adversely affected.

From DE-OS 28 05 985 is a welding machine to Her position of window, door frames or the like Plastic profiles known from a rack to the profiles to be welded and the welding unit serves. Also with this known welding machine become the individual, mitred art Fabric profile pieces inserted one by one, out judges and clamps what, as already explained above, is cumbersome and time consuming.

The invention is therefore based on the object, a Ver drive to produce a rectangular frame, esp special of a window frame, made of a plastic profile specify by which the delivery of the plastic profile pieces from the cutting machine to the welding machine including the alignment and clamping process significantly shortened and thus the output of a related device tion is increased.

To solve this problem, the invention Process suggested that the cut plastic Profiles each for a frame in an intermediate dish cher stored there individually by one in three levels Removed mobile gripper and in the specified position lungs depending on the frame size provided welding machine can be inserted. This procedure ren ensures that the plastic profile pieces after Not only quickly get the cut to the welding machine, but also aligned there and in no time be excited. This can improve the performance of sweat machine and plastering machine can be fully utilized.  

Further features of the method and a device to carry out the method are in claims 2 to 12 disclosed.

The invention is based on a in a drawing voltage illustrated embodiment explained in more detail.

In this embodiment, a device for producing a rectangular frame, for example a window frame, is shown in a highly simplified manner, which is formed from four plastic profile pieces 1-4 . The plastic profile pieces 1 , 2 and the plastic profile pieces 3 , 4 are of the same length and are each provided with a miter surface 5 at their ends. This plastic profile pieces 1-4 are separated from a finite profile strand 6 by means of a cutting machine 7 . Since the cutting machine 7 consists of two spaced apart, relatively mutually adjustable saw blades 8 , which extend at an angle of 45 ° to the profile strand 6 . The profile strand 6 is guided in the cutting machine 7 via a stop rail 9 , and each plastic profile piece 1-4 is individually produced or separated. The two saw blades 8 can be adjusted relative to one another either manually or via a special control program. The lengths of the individual plastic profile pieces 1-4 for a frame or the frame dimensions are entered into a control unit, in which the profile cross section of the frame can also be entered or saved, for example.

The four, each forming a frame, plastic profile pieces 1-4 are stored, for example by hand, in a special buffer 10 . For this transport, if necessary, a not shown, for example program-controlled gripper can be provided, which detects the cut plastic profile pieces 1-4 on the cutting machine, transports it to the intermediate storage 10 and stores it there.

In the illustrated embodiment, the intermediate store 10 has only three chambers, each of which advantageously accommodate the four plastic profile pieces 1-4 of a frame in a predetermined order. In addition to the webs 11 , which limit the individual chambers of the intermediate store 10 , special, not shown, adjustable stop pins can be provided in the chambers, which ensure that the individual plastic profile pieces 1-4 represent the position shown, in which the same a predetermined one Have a distance from each other. The base of the intermediate store is inclined in an advantageous manner, and a stop bar 12 is provided at the lowest point of the intermediate store 10 . The inclination of the base surface is intended to ensure that the plastic profile pieces 1-4 always rest against the stop bar 12 at one end. If necessary, the base of the intermediate storage 10 can be provided with rollers or balls which ensure a movement of the plastic profile pieces 1-4 in the direction of the stop bar 12 .

At a distance from the buffer 12 , a welding machine 13 is provided. This welding machine 13 has essentially four welding inserts 14 arranged in pairs at the corners of a rectangle, which are adapted to the profile cross section of the plastic profile 6 or the plastic profile pieces 1-4 . These welding shims 14 are in a known manner, not shown, individually or in pairs can be moved on guides and can, for example, be preset to the desired size of the frame via a program control. To the side of the welding machine is a bearing 15 , which can accommodate the differently profiled sets of welding shims 14 .

In this exemplary embodiment, a gripper 16 is assigned to the welding machine 13 and the intermediate storage 10 . The water gripper 16 is seen with interchangeable gripper plates which, on the one hand, the plastic profile pieces 1-4 and, on the other hand, the welding shims 14 are adaptable. In the illustrated embodiment, the gripper 16 is taken up by a piston rod of a vertical piston cylinder unit 17 , which in turn is attached to a carriage 18 . The carriage 18 is movable on a guide 19 , which in turn on wheels or the like. On two spaced rails 20 from each other who can move. Both the carriage 18 and the guide 19 are arranged to known, not shown travel drives.

The rails 20 are advantageously located above half of the buffer 10 and the welding machine 13 and, if necessary, can either be attached to a ceiling or supported on the floor by means of stands. As well as the opening and closing movement as well as the driving movement of the gripper 16 take place via a special control program. The frame size and / or the profile cross section are entered into a control unit. From the gripper 16 in the intermediate storage 10 Chen, each belonging to a frame, plastic profile pieces 1-4 are sequentially detected and precisely at the pre-specified locations of the preset welding machine 13 , for example on the welding shims 14 , filed. A special alignment of the individual plastic profile pieces 1-4 is not necessary. After all four plastic profile pieces are in the predetermined position of the welding machine 13 , - there is a gap between the individual plastic profile pieces 1-4 , heating blades 21 are inserted between the miter surfaces 5 of the adjacent plastic profile pieces 1-4 , which are the miter surfaces 5 so heat strongly that they can be welded together by pressure after removing the heating blades 21 .

The welded frame is, for example, on a Transport roller table, not shown, raised or abge lowers and from this to a cleaning material, not shown machine transported. Here the individual corners of the Frame after rotating it 90 °, processed one after the other and at least in the area of Visible areas of the sweat created during the welding process caterpillars exempt.

As already mentioned, the profile pieces 1-4 in the intermediate store 10 have a predetermined distance from one another. This distance is dimensioned so large that the gripper 16 can grasp the individual plastic profile pieces 1-4 without disturbing the adjacent plastic profile piece 1-4 . In the manufacture of a frame with a different cross section, the welding shims 14 of the welding machine 13 must be replaced. This is done in an advantageous manner also by means of the gripper 16 , the Grei ferplatten must be replaced beforehand. The gripper plates can be replaced via a special program control, the cross section of the frame being entered into a control unit. The movement of the Grei fers 16 for the replacement of the welding shims 14 is carried out via a control program. The required values are also entered into the control unit for this purpose. In this case, who initially removes the welding shims 14 located in the welding machine 13 , which are secured there, for example, by means of special clamping elements, and stored in the bearing 15 . At the same time, other welding supplements 14 are removed from the bearing 15 and inserted into the welding machine 13 .

In a modification of the embodiment described, it is possible to preset the length of the individual plastic profile pieces contained 10 sample in the chambers of the latch 1-4 in manner known per se, or to measure and in dependence on the determined length of the welding machine. 13 The buffer 10 has the task of forming a buffer between the cutting machine 7 and the welding machine 13 and thus to compensate for the different cycle times.

In a modification of the embodiment, it is possible that the gripper 16 can also move over the cutting machine 7 and transport the plastic profile pieces 1-4 cut there to the intermediate storage device 10 and deposit them there. If necessary, however, a second or additional gripper can also be provided for this purpose, which can be moved on the rails 20 via a separate guide.

In the illustrated embodiment, the cutting machine 7 , the gripper 16 and the welding machine 13 and the downstream cleaning machine are each assigned a separate control, which can either be adjusted or programmed individually or, if necessary, provided with the necessary data by a central unit become. The central, the individual controls over ordered unit has the advantage that the data for the same or different frames only have to be entered once. Such an arrangement is advantageous if an already existing welding machine with downstream cleaning machine is supplemented by an upstream buffer 10 and a gripper.

With a complete or new device for manufacturing Rectangular frame is expedient se uses a central control system that controls each individual Controls parts of the device.

In a modification of the exemplary embodiment, it is also possible to arrange the cutting machine 7 and / or the intermediate store 10 in a position rotated by 90 ° to the welding machine 13 . However, this results in a longer extension of the device.

Claims (12)

1. A method for producing a rectangular frame, in particular a window frame, made of a plastic profile, in which four plastic profile pieces are cut to length using go tion and clamped in a welding machine using interchangeable inserts corresponding to the profile cross section and simultaneously on all miter surfaces with heating and Pressure are welded together and in which the resulting weld beads are machined in a downstream plastering machine, characterized in that the cut plastic profile pieces are each stored for a frame in a buffer store, where they are removed individually from a gripper that can be moved in three planes and into the predetermined positions the welding machine preset depending on the frame size. 2. The method according to claim 1, characterized, that the length of the cut plastic profile pieces a frame is scanned in the buffer and the movement depending on the determined length of the gripper is controlled. 3. The method according to claim 1, characterized, that the length of the plastic profile pieces of a frame saved when cropping and depending on the stored values the movement of the gripper is controlled. 4. The method according to claim 1, characterized, that the plastic profile pieces for a frame after tailored to a storable program and according to the The program controls the movement of the gripper.   5. Apparatus for producing a rectangular frame, in particular a window frame, from a plastic profile, in particular for carrying out the method according to at least one of claims 1 to 4 consisting of a cutting machine, a welding machine and a cleaning machine with a swivel table connected to the same via a transport roller table , characterized in that between the cutting machine ( 7 ) and the welding machine ( 13 ), a buffer ( 10 ) for the plastic profile pieces ( 1-4 ) at least two frames and a program-controlled, movable in three levels gripper ( 16 ) is arranged. 6. The device according to claim 5, characterized in that the intermediate memory ( 10 ) has an inclined base and at its deepest point a stop bar ( 12 ). 7. The device according to claim 6, characterized, that the base is provided with rollers or balls. 8. Device according to one of claims 1 to 7, characterized in that the gripper ( 16 ) on the piston rod of a verti cal piston cylinder unit ( 17 ) attached, the piston cylinder unit ( 17 ) on a on a guide ( 19 ) movable carriage ( 18th ) secured and the guide ( 19 ) can be moved transversely to the travel movement of the carriage ( 18 ). 9. The device according to claim 8, characterized, that the piston rod is assigned a rotary drive. 10. The device according to claim 8, characterized in that the guide ( 19 ) is movable at its ends on two rails ( 20 ). 11. The device according to claim 10, characterized in that the rails ( 20 ) over the welding machine ( 13 ) and the intermediate storage ( 10 ) extend. 12. The apparatus according to claim 10, characterized in that the rails ( 20 ) over the welding machine ( 13 ), the intermediate store ( 10 ) and the cutting machine ( 7 ) extend.