DE9014089U1 - Paper roll cutter - Google Patents

Description

Paper roll cutter

The subject of the present innovation is a paper roll cutter for drawing paper according to the generic term of claim 1.

It is known to integrate such a cutting device into a plotter; i.e. the cutting device is part of the plotter.

Such plotters work with paper formats of, for example, a width of 944 mm, with the paper being pulled endlessly from a main paper roll.

However, the majority of plotters do not have an integrated cutting device. This has the disadvantage that the paper must be cut at the correct angle before the plotting process, which is very difficult. So far, it is only known to make such an angled cut using a paper knife and a steel ruler or to cut with scissors. However, this has the disadvantage that in order to achieve an angled cut, the cutting length must first be measured on both sides in order to then mark the cutting edge and then carry out the cutting process. Despite this high level of work, it is often not possible to achieve an angled cut. However, achieving an angled cut is extremely important for the plotting process because the paper with its cut front edge must be placed on a marking line on the plotter in order to be fed into the plotter in the correct position during the drawing process. If the paper cut is not correct at the front edge of the paper, then the paper will be aligned at an angle on the plotter and will therefore also be fed in at an angle, which will destroy the edges of the paper. The paper will then be unusable.

The present innovation is therefore based on the task of designing a paper roll cutter of the type mentioned above in such a way that the paper can be cut at the right angle to the long edge.

To solve the problem, the innovation is characterized in that at least one main roller is rotatably mounted in a frame, from which main roller the paper is pulled through a sheet guide, wherein a cutting device is arranged on the lower edge of the sheet guide, which is held in the frame so as to be transversely displaceable at the right angle to the roller, and that a clamping device is arranged on the underside of the sheet guide, which extends at least over the entire width of the paper to be clamped.

The technical teaching provided achieves the essential advantage that the paper roll cutter according to claim 1 now makes it possible to cut the transverse edge of the paper at the correct angle in relation to the longitudinal edge. The paper is pulled off a main roll and first guided through a sheet guide, with the cutting device arranged on the lower edge of the sheet guide. It is important that the cutting device and its guide are arranged exactly parallel to the axis of the main roll so that the paper web can be cut at the correct angle.

In order to be able to carry out such a cut, it is also necessary that the paper is clamped across the entire width beyond the cutting device, i.e. below the sheet guide, in order to avoid any unacceptable displacement of the paper during the cutting process.

There are two different designs for the clamping device.

In a first embodiment, it is provided that a separate

Clamping device is arranged below the sheet guide, so that the cutting device is provided between the sheet guide and the clamping device.

In a second embodiment, it is provided that the sheet guide itself is designed as a clamping device and that the cutting device is arranged on the underside of this sheet guide.

Separate protection is claimed for both versions within the scope of the present innovation.

In a preferred embodiment of the present invention, it is provided that the clamping is not only carried out mechanically via a clamping jaw that extends over the entire width of the paper web, but that a magnetic clamp is also provided.

Such mechanical clamping jaws can have mechanical inaccuracies, which means that it is not guaranteed that the clamping is carried out evenly with the same pressure across the entire width of the paper web.

To remedy this disadvantage, an additional magnetic clamp is provided. This magnetic clamp essentially consists of individual disc-shaped magnets that are arranged at a distance from one another on the inside of the clamping jaw. Fixed screws are provided opposite the disc-shaped magnets, which are screwed into a stationary base plate.

If there are any inaccuracies in the clamping strip, the magnetic clamps (consisting of magnets and opposing fixed screws) still exert an even clamping pressure across the entire width of the paper.

In a further development of the present innovation,

It is provided that the clamping bracket required to move the clamping jaw is held magnetically in its open position and the closed position (clamping position) is designed to be self-clamping.

Furthermore, it is advantageous that the frame of the paper roll cutter according to the present innovation is formed from longitudinal profiles, which longitudinal profiles (according to their selected length) can accommodate any number of supply rolls.

In the preferred embodiment, a paper roll cutter accommodates, for example, two supply rolls and a main roll.

In other designs (depending on the frame height), three supply rolls, each with a main roller, can be held in the frame. Replacing them is very easy by pulling the respective supply roll with its shaft out of the bearing and inserting it in place of the main roller.

It is also preferred if the sheet guide and the clamping device are made of a transparent acrylic glass material, because then the paper path and the cutting process can be observed very well.

The present innovation will now be described in more detail using an example. The description and drawings reveal further advantages and features of the present innovation.

The subject matter of the present invention arises not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with each other. All information and features disclosed in the documents - including the summary, in particular the spatial design shown in the drawings - are claimed as essential to the invention insofar as they individually or in combination are superior to the state of the art.

- 8 of the technology are new.

In the following, the invention is explained in more detail using drawings that merely illustrate one embodiment. Further essential features and advantages of the invention are evident from the drawings and their description.

Show it:

Figure 1: the paper roll cutter in front view,

Figure 2: Section along line H-II in Figure 1.

The paper roll cutter 1 according to Figures 1 and 2 consists essentially of a rectangular frame 2, which has two parallel longitudinal profiles 3, 4, which are connected to one another at the top and bottom via corresponding transverse profiles 5, 6.

The longitudinal profiles 3 have grooves on the inside that run in the longitudinal direction, into which roller bearings 8 engage, which are guided in the arrow directions 9 so that they can be moved and locked. It is important that the roller bearings 8 are moved in the arrow directions 9 in the grooves 7 of the longitudinal profile 3, 4 so that the main roller 39 and/or the supply roller 40 are mounted absolutely parallel. This adjustment of the roller bearings 8 is carried out and marked accordingly during production.

Furthermore, a cutting device 12 is arranged in the frame near the lower cross-section 5, as well as, according to Figure 2, a plank guide 43 and a clamping device 44 located underneath.

All parts are connected to one another and are attached to a bearing block 10, which in turn is guided and lockable in the grooves 7 of the longitudinal profiles 3,4.

Due to the factory-specified markings, the device can be delivered in a disassembled state and the corresponding settings are made based on the given markings on the grooves 7 in the area of the longitudinal profiles 3,4.

In this case, screws pass through the holes 11 in the bearing block 10 indicated in Figure 2 and are secured in the grooves 7 by means of slot clamps.

The paper 38 is pulled off a main roller 39, which has a bearing shaft 41, which has receiving cones 42 on the front side, which are connected to the roller bearings 8.

The paper 38 is pulled downwards from the main roller 39 in the direction of arrow 45 and enters the inlet funnel 16 of the sheet guide 43. The sheet guide 43 consists of two stationary, opposing plates, namely a base plate 13 and an opposing guide plate 14. The two plates form a guide gap 36 between them, which can be between 5/10 mm and 1 mm, for example.

The two plates 13,14 are attached to the bearing block 10.

At the same time, the bearing block 10 carries the cutting device 12. The cutting device 12 consists of a round-profile rod 26 extending over the entire width, which carries a square guide 27 via roller bearings (not shown in detail), which is guided on the rod 26 in a displaceable manner (to the plane of the drawing in Figure 2).

A handle 28 is attached to the top of the square guide 27 via an arm 29.

The knife 31 is attached to the underside of the square guide 27 via a knurled screw 30 and forms a front cutting edge 35.

which is located opposite a fixed cutting notch 37 which is formed in the front side of the base plate 13.

The paper is thus cut by the knife 31, which moves perpendicularly to the plane of the drawing in Figure 2, directly at the outlet of the guide gap 36.

It is important here that the rod 26 is further stabilized by an additional square-profiled strip 32, which is connected to the bearing block 10 via screws 34. This ensures that the rod 26 is exactly parallel to the shaft 41 of the main roller 39 in order to achieve an angled cut.

A clamping device 44 is arranged on the underside of the blade guide 43. The stationary clamping jaw is formed by the extension of the base plate 13 downwards, with an arm 18 being pivotably received in a pivot bearing 21 of the base plate 13.

The movable terminal block 15 is connected to the arm 18 with a screw 20.

The arms 18 are arranged on the sides of the frame 2 and they are connected to one another across the entire width by a clamping bracket 17.

Figure 2 shows two different clamping positions of the clamping device 44.

Beyond the pivot bearing 21, a further rod 22 is arranged, which also extends over the entire width of the paper, is the same length as the clamping bracket 17 and serves to stabilize the entire clamping bracket.

If the clamping bracket 17 is pivoted downwards in the direction of arrow 46 (e.g. over a pivoting angle of 30°), then the terminal block 15 is pushed with its inner side against the associated front of the base plate 13

pressed together and the paper in between is clamped.

In order to further improve the clamping, an additional magnetic clamp is provided. Disc-shaped magnets 19 are arranged at a distance from each other on the

Arranged inside of the terminal block 15 so that the outer surface of the respective magnet is flush with the clamping surface of the terminal block 15.

Opposite, screws 23 are screwed into the base plate 13, which are preferably designed as countersunk head screws.

The magnet 19 is therefore located exactly opposite the countersunk head of the respective screw 13.

If the clamping device 44 is now actuated in the direction of arrow 46, then not only does the clamping strip 15 rest against the front of the base plate 13 over its entire width, but in addition the magnets 19 are also attracted to the head of the screws 23 by magnetic holding force, which provides additional holding of the paper.

Even if the terminal block 15 is not exactly parallel to the clamping surface, the magnetic force of the magnets 19 is sufficient to achieve adequate clamping.

The clamping directly below the knife 31 is important in order to hold the paper on the one hand in the guide gap 36 and on the other hand in the clamping device 44 underneath in order to achieve the above-mentioned cut at the correct angle.

In another embodiment - not shown in detail in the drawing - it is provided that the blade guide 43 itself is designed as a clamping device. In this case, the front guide plate 14 would then be designed to be movable and clampable.

In addition, the clamping device 44 also has a magnetic opening holder. In this case, a square bar 24 is arranged on the back of the base plate 13, which extends over the entire width of the paper. Thanks to this bar 24, the entire arrangement is also stabilized without distortion.

On the top of the bar 24, disc-shaped magnets 25 are arranged parallel to one another at a distance from one another. As soon as the clamping device 44 is moved into the open position, the (magnetic) rod 22 is attracted to the magnets 25 underneath and the open position is thus fixed.

After clamping has been completed, the cutting device can now be put into operation; i.e. the handle 28 is grasped by hand and the square guide 27 with the knife 31 attached to it is guided along the clamped paper, whereby the cutting edge 35 cleanly cuts through the knife in the area of the opposite cutting notch 37.

This results in an absolutely correct angle cut because the rod 26 together with the stabilizing bar 32 are positioned exactly parallel to the shaft 41 of the main roller 39.

It is also intended that the shafts of the supply roll 40 are aligned at the correct angle so that when the main roll 39 is used up, the main roll does not need to be replaced, but the paper can be pulled directly downwards from the supply roll 40.

It is particularly advantageous if the base plate 13, the guide plate 14 and the clamping strip 15 are made of transparent acrylic glass in order to be able to easily observe the paper path and the cutting process.

DRAWING LEGEND

1 paper roll cutter

2 frames

3 Longitudinal profile

4 "

5 Cross section

6 "

7 grooves

8 roller bearings

9 Arrow direction

10 Bearing block

11 Bore

12 Cutting device

13 Base plate (rear)

14 Guide plate (front)

15 Terminal block 15'

16 inlet funnels

17 clamp bracket 17'

18 Arms 18'

19 Magnet

20 Screw

21 swivel bearing

22 rod

23 Screw

24 Bar

25 Magnet

26 rod

27 Square guide

28 Handle

29 Arm

30 Knurled screw

31 knives

32 Bar

34 Screw

35 cutting edge

36 Guide gap

37 Cutting notch

38 Paper

39 Main role

40 supply roll

41 Bearing shaft

42 Mounting cone

43 Sheet guide

44 Clamping device

45 Arrow direction

46 Arrow direction

Claims (9)

1. Paper roll separator for drawing papers, whereby these are pulled from a main roll and cut at right angles to the pulling direction, characterized in that at least one main roll (39) is rotatably mounted in a frame (2), whereby the paper is pulled through a sheet guide (43) and a cutting device (12) is arranged on the lower edge of the sheet guide (43), which is held in the frame (2) so as to be transversely displaceable at the right angle to the roll (39), and that a clamping device (44) is arranged on the underside of the sheet guide (43), which extends at least over the entire width of the paper to be clamped. Telephone: Telex: Facsimile / Fax: S Lindau (O 83 82) 5 43 74 (patent-d) +49-8382-78027 7 80 25 Telegram address: patri-lindau Bank accounts: Postal checking account Bayer. Vereinsbank Lindau (B) No. 1257 110 (bank code 735 200 74) Munich 414 848-808 Hypo-Bank Lindau (B) No. 66 70-326 843 (bank code 733 204 42) (bank code 700 10080) Volksbank Lir.dau (B) No. 51 222 000 (bank code 735 901 20) 2. Paper roll cutter according to claim 1, d a t i o n g e k e &eegr;&eegr;&zgr; e i c h &eegr; e t that the clamping device (44) is arranged as a separate device below the sheet guide (43), wherein the cutting device (12) is provided between the sheet guide (43) and the clamping device (44). 3. Paper roll cutter according to claim 1, characterized in that the sheet guide (43) itself is designed as a clamping device and that the cutting device (12) is arranged on the underside of the sheet guide. 4. Paper roll cutter according to claims 1 - 3, characterized in that the paper clamping is not only carried out mechanically via a clamping strip (15, 15') which extends over the entire width of the paper web, but that in addition a magnetic clamping is also provided via disc-shaped magnets (19). 5. Paper roll cutter according to claim 1, characterized in that the clamping arm (18, 18') of the clamping device (44) required for moving the clamping strip (15, 15') is held magnetically in its open position and that the closed position (clamping) is designed to be self-locking. 6. Paper roll cutter according to claim 1, characterized in that the frame (2) of the paper roll cutter (1) is formed by longitudinal and transverse profiles (3, 4, 5, 6), wherein any number of supply rolls (40) are arranged in the frame (2). 7. Paper roll cutter according to claims 1 -3, characterized in that the sheet guide (43) and the clamping device (44) are made of a transparent acrylic glass material. 8. Paper roll cutter according to claims 1 -3, characterized in that the sheet guide (43) consists of two stationary, opposing plates (13, 14) which form a guide gap (36) between them. 9. Paper roll cutter according to claims 1 - 3, characterized in that the clamping device (44) has a clamping strip (15) which is pivoted against the base plate by arms (18) mounted on a base plate (13) on pivot bearings (21), the arms (18) being connected to one another over the entire width via a clamping bracket (17) and via a rod (22).