DE29808312U1 - Cutting knife - Google Patents

Description

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cpm GmbH - EK/jj
- 1/3 -

2 Utility model application

4 "Separator"

5 .

6 Description

8 Plastic profiles are manufactured as continuous products using the extrusion process. These

9 Continuous products must be cut to processable lengths.

10 saws are usually used. These saws have the disadvantage that a large

11 number of chips are generated that have to be disposed of and in addition a considerable

12 noise pollution. Recently, these saws have been replaced by devices for

13 chipless cutting. For chipless cutting, a knife is inserted into a frame

14, hydraulically or pneumatically driven and slowly cuts through the

15 profile. Particularly due to the slow separation speed, high forces are generated,

16 which are usually caught by a closed frame.
17

18 A corresponding device is shown in Figure 1. The piston or cylinder

19 (1) builds up the power for the knife (6) The knife is moved downwards and separates

20 thus the profile (11). The total force is distributed by the closed frame

21 the components (2) and (3) as well as the upper plate (4) and the lower plate (5)

22 recorded.
23

24 During the extrusion of the endless profiles (11) it may happen that the cutting edge of the

25 knife (6) is damaged by metal parts or other reasons and this

26 must be changed. The knife cannot usually be replaced in a simple form

27, as it is guided sideways. To change the blade,

28 Therefore, a folding device as shown in Figure 2 has been developed.

iGidrgsmarienhütte,

cpm GmbH - EK/jj

-2/3-

1 The entire frame is folded back around the pivot point (8).

2 only the position (9) needs to be unlocked. When the frame is completely

3 is folded, the knife can be pulled downwards out of its guides.

4 This system has the crucial disadvantage that it only works if very

5 thin profiles are used and if there is enough space to

6 Fold the unit backwards 2x1. This is usually not the case, as the separating unit

7 is completely encapsulated for reasons of accident prevention. This creates a considerable

8 Effort (remove blade downwards) when changing the blade. Usually this is

9 hardly possible when the system is running.
10

11 The inventive task is to construct a device in such a way that during the running

12 operation the knife can be changed. In addition, the advantage should be created

13 to provide more space for the extrusion start-up process.

15 The inventive solution to this problem is to extend the front side frame (2) around the

16 pivot point (9) to the outside. The existing frame with the

17 cylinder (1), the upper part (4) and the rear side part (3) in its previous

18 position. The side part (2) is locked in position (10) or can

19 can be released there. The side arm (2) can be completely pushed forward into the plane

20. The side arm (2) contains the guide for the knife. In the

21 folded back, the knife (6) can be moved sideways without any problems

22 without having to stop the extrusion line. The

23 Locking of the knife was in this case with a quick release device

24, so that without the aid of tools, the

25 Replacement of the knife can take place.

Claims (14)

j "" . &Sgr; i *··. ^: Gf<fr#sTmarienhütte, cpm GmbH - EK/jj -3/3- 2 Protection claims 3_ 1. Device for separating extruded hollow profiles made of thermoplastic 4 Material, in particular window and door frame profiles, where the material to be separated 5 profile is separated with HuTe a knife separator, thereby 6 characterized in that the force frame for applying the necessary 7 Cutting force is at least one-sidedly hinged in such a way that two or three 8 frame boundaries remain in place and in this unfolded state 9 the knife can be pulled out sideways (see picture 1) 10 2. Device according to claim 1, characterized in that in the 11 A guide for the knife is integrated in the side part (2). 12 3. Device according to claim 1, characterized in that 13 Unfolding at least one boundary of the force frame as a pivot point (12) (in 14 Figure 4) is located above the knife.