DE29601840U1 - Grinding device - Google Patents

Description

Description

The invention relates to grinding devices for sharpening a circular blade of a cutting machine and to cutting machines for food, in particular for cold cuts such as sausage, ham, cheese or the like. The cutting machine comprises a circular blade for cutting the food to be cut, a carriage for supporting the material to be cut on a carriage table, the carriage being displaceable parallel to the plane of the circular blade along the cutting area of the circular blade, and a grinding device for sharpening the circular blade. The grinding device contains at least one grinding element, in particular a rotatably mounted grinding wheel and/or a rotatably mounted grinding cone for sharpening the circular blade. The grinding device can be attached to the carriage of the cutting machine in a predetermined position relative to the circular blade for the sharpening process.

Such cutting machines are used to cut food, especially cold cuts. When cutting, the item to be cut rests on the carriage table of the carriage, which moves in a guide mechanism, and is moved parallel to the plane of the circular knife along the cutting area of the circular knife. To ensure a clean and easy cut, the circular knife must be reground at regular intervals. To do this, the grinding device is attached to the carriage, the carriage is moved to the knife, the grinding element or elements grip the knife and sharpen it.

Various designs are known for attaching the grinding device to the carriage or generally to the cutting machine. The carriage tables of known cutting machines are generally fixed to the edge perpendicular to the plane of the circular blade and adjacent to the user.

by a front wall, which is designed in particular as a hand guard made of transparent plastic. It is now known to provide this hand guard with holes through which screws or threaded bolts for screwing the grinding device to the carriage pass. If these holes have a relatively small diameter, as is usual, dirt can collect in the holes so that the parts no longer meet hygienic requirements. Holes with a larger diameter would be easy to clean, but in this case it would be possible for the user of the cutting machine to, for example, put a finger through these holes if the grinding device is not attached to the cutting machine during the normal cutting process, so that the front wall adjacent to the user can no longer fulfill its function as hand protection.

It is also known from practice to provide the slide table with dovetail-shaped or similar grooves, into which the grinding device can be inserted and secured with a correspondingly designed foot. However, these grooves are also difficult to clean, so that dirt can collect in them. They also cause interference when placing the material to be cut on the slide table.

From DE-U 94 19 399 a grinding device of the type mentioned above is known, which uses a grinding strip that can be fixed to the carriage of the cutting machine to accommodate the grinding device. The grinding strip can preferably be fixed to the hand guard of the carriage using a locking screw. The grinding device shown is very complicated in its construction, and is therefore expensive to manufacture and difficult to mount on the carriage.

Known cutting machines of the type mentioned above generally have a guide wall for guiding the material to be cut, which is arranged at a short distance approximately parallel to the plane of the circular blade. The distance between the guide wall and the plane

The circular blade determines the thickness of the slices of the material to be cut during the cutting process, the so-called cutting thickness. The circular blade, the guide mechanism of the carriage and the guide wall are usually attached to a common base frame, and the distance of the guide wall to the plane of the circular blade can be adjusted using an adjustment knob in order to be able to change the cutting thickness of the slices of material cut off.

It is now also known to attach the grinding device to the guide wall using a clamping mechanism. However, compared to the carriage, which is usually very mechanically strong and stable and is guided in a very precise guide mechanism that is precisely aligned relative to the circular blade, the guide wall is not very stable mechanically and is generally not aligned exactly parallel to the circular blade plane. On the contrary, the guide wall is often deliberately arranged at an angle to the circular blade plane in order to prevent the material being cut from smearing on the guide wall. This method of attaching the grinding device must therefore lead to an imprecise, poor grinding result.

It is also known to clamp the grinding device between the edge of the carriage facing the circular knife and the guide wall that is adjustable perpendicular to the circular knife plane. However, the disadvantages of attaching the grinding device to the guide wall mentioned above also apply here. Another disadvantage is that there is a considerable lever arm between the clamping point of the grinding device at the level of the carriage table and the grinding point at the level of the grinding element or elements, which can tilt the grinding device and thus lead to incorrect grinding.
35

The task is therefore to develop a grinding device and a cutting machine with a grinding device of the

The aim of the invention is to propose a grinding device of the type mentioned above, whereby the grinding device should allow an exact, precise grinding of the circular blade, should be inexpensive to manufacture and should be easy to attach to the carriage of the cutting machine. In a further development of the invention, it is particularly desirable that the new type of grinding device should also be suitable for use on existing cutting machines without these having to be structurally modified in the slightest. In a further development of the invention, the new type of grinding device should therefore be able to completely replace the known grinding devices with the disadvantages mentioned on already known and existing cutting machines without structural changes to the cutting machines.

According to the invention, the object is achieved by a grinding device and by a cutting machine in which the grinding device can be clamped for attachment to the slide table between at least one point on the edge of the slide on the one hand and at least one further point on the slide on the other hand.

The invention is based on the basic idea of using the fact that the carriage in its guide mechanism is usually in relation to its distance from the circular knife and its angle to the circular knife plane in order to mount the grinding device as precisely as possible in relation to the circular knife.

■ is guided and aligned extremely precisely and is generally mechanically very stable, while the other parts of the cutting device are generally less precisely aligned. By bracing the grinding device for attachment to the slide table between an edge of the slide on the one hand and at least one other point on the slide on the other hand, the already existing, precisely aligned and guided edge of the slide is used for mounting the grinding device, thus improving the precision of the grinding and reducing the number of special tools previously required for mounting the grinding device.

- 5 trained
fastening points or eliminates them completely.

It is preferable to use the edge of the carriage adjacent to the circular knife to attach the grinding device to the carriage table, as this is aligned and guided particularly precisely in relation to the circular knife and its small distance from the circular knife minimizes the lever arm between the attachment point of the grinding device and the point(s) of attack of the grinding element or elements on the circular knife.

It is also preferable to use at least two locations on the edge of the carriage for attaching the grinding device in order to increase the stability of the assembly and to further minimize the number of specially designed fastening points.

It is particularly preferred that the grinding device for attachment to the slide table can be clamped between at least two points on the edge of the slide adjacent to the circular blade on the one hand and at least one further point on the opposite edge on the other. In this way, the clamping direction extends exactly in the plane of the slide, which is generally designed to be very mechanically stable. The slide of known cutting machines can generally be pivoted about a horizontal axis running parallel to the plane of the circular blade, approximately along the edge of the slide facing away from the circular blade, in order to clean the slide, so that the attachment points of the new grinding device on the edges of the slide are easy to clean.

Contact with an edge of the carriage in the position of use of the grinding device can, for example, be achieved by the grinding device comprising at least one hook or a hook surface for contact with the edge of the carriage. According to a particularly preferred further development of the invention,

-S-

In the invention, which will be described in more detail using an exemplary embodiment, the grinding device comprises at least three hooks or at least one hook surface and at least one further hook or at least one further hook surface for contact with opposite edges of the carriage. In this case, the grinding device can then simply be clamped to opposite edges of the carriage by means of the hooks or hook surface(s), so that no specially designed fastening points on the carriage are necessary for attaching the grinding device. Such a further developed grinding device according to the invention, which is characterized by an elegant and simple construction, can therefore be used as a retrofit part on practically any existing cutting machine without any problems and without structural changes to the cutting machine. The grinding device preferably comprises at least one arm which is designed like a hook at the end and which is arranged essentially parallel to the carriage table in the position of use.
20

The arm can advantageously - particularly if the grinding device is offered as a retrofit part for use on existing cutting machines - be designed to be adjustable in length to adapt to the dimensions of the slide table of the respective cutting machine, for example by means of holes at suitably selected intervals for the passage of a screw connection link with the other components of the grinding device. To save space when the grinding device is not in use, the arm is preferably designed to be foldable, retractable or removable. In a further development of the invention, the hook at the end of the arm is designed to be movable for bracing the grinding device, for example by being designed as a pin which is mounted eccentrically in a corresponding receptacle on the arm.

Of course, there are also a large number of other

—π—

Possibilities for bracing the grinding device according to the invention are conceivable. For example, the hook can have a threaded hole through which a screw is guided, which presses on the corresponding edge of the carriage to brace the grinding device. It is also conceivable, for example, that the grinding device has contact with the edge of the carriage adjacent to the circular knife by means of two hooks and an arm of the grinding device rests on the carriage table at a third point, with the grinding device pressing itself against the guide wall with a spring-loaded roller and the pressure of the roller pressing the grinding device onto the carriage table at the third point and bracing it between the edge of the carriage on the one hand and the point on the carriage table on the other.

Another possible embodiment is, for example, to design the grinding device with two hooks on the one hand, which are in contact with the edge of the slide adjacent to the circular knife, and on the other hand to provide a fastening option in a recess in the slide table or on a pin on the slide table or the like for bracing. This latter option is not preferred, however, since the necessary recess in the slide table or the pin on the slide table can in turn lead to the accumulation of dirt.

■ If the slide table is closed off, as usual, at its edge perpendicular to the plane of the circular knife and adjacent to the user by a front wall, which can be designed in particular as a hand guard made of transparent plastic, then in order to further increase the stability and accuracy of the attachment of the grinding device, it is preferably provided that the grinding device can be brought completely or preferably partially into contact with this front wall. In this way, the grinding device can be aligned even more precisely with the plane of the circular knife in order to further increase the grinding accuracy.

If the slide table is closed not only by a front wall but also by a rear wall on the edge opposite the front wall, the length of the grinding device in the direction parallel to the plane of the circular knife in the position of use is preferably designed to match the distance between the front and rear walls, i.e. to the length of the slide table. In this way, the position of the grinding element or elements in the position of use relative to the slide is precisely specified not only in the transverse direction, i.e. in the direction transverse to the plane of the circular knife, but also in the longitudinal direction of the circular knife, so that operating errors when attaching the grinding device or when sharpening the circular knife using the grinding device are almost completely ruled out.

This can be achieved structurally, for example, by the grinding device comprising a protective plate made of transparent material, in particular transparent plastic, which is arranged parallel to the plane of the circular blade in the position of use and whose longitudinal extension at its lower edge corresponds at least approximately to the length of the slide table. The protective plate also ensures that the user's fingers or hand cannot reach the area of the circular blade or the grinding elements during the regrinding process, since these areas are covered by the protective plate, which is preferably transparent.

Further advantageous embodiments of the invention are the subject of the dependent claims.

The invention is explained in more detail below using a particularly preferred embodiment of the invention. In the accompanying drawings:
35

Fig. 1 is a side view of the embodiment of a cutting machine according to the invention from one direction

transversely to the circular blade plane from the side of the guide wall facing away from the carriage, whereby the embodiment of the grinding device according to the invention is not mounted on the cutting machine; 5

Fig. 2 is a side view corresponding to Fig. 1, but now showing the embodiment of the grinding device in the assembled state; for clarity, the guide wall and parts of the circular blade are not shown;

Fig. 3 is a plan view of the embodiment of Figs. 1 and 2, again with the guide wall not shown;
15

Fig. 4 a side view of the embodiment of the grinding device in the direction of view parallel to the plane of the circular blade in the direction of the front wall and

Fig. 5 is a partial side view of the embodiment of the grinding device in the direction of Figs. 1 and 2.

Fig. 1 shows schematically a particularly preferred embodiment of a cutting machine 30 according to the invention. A circular knife 31, which is driven by a motor 32, is protected over a large part of its circumference by a circular protective

• sheet metal 3 8 covered to prevent possible injuries when touching the circular blade 31. The material to be cut can be placed on the carriage table 41 of a carriage 40, which can be moved very precisely on a guide mechanism 3 9 at a small, defined distance parallel to the plane of the circular blade 31 along the cutting area of the circular blade 31. The material to be cut is secured on the carriage table 41 by means of a material holder 37. The material holder 37 5 is attached to a round rod 50 serving as a pivot axis on a rear wall 53 facing away from the user and closing off the carriage table 41 in this direction. For use

A handle 51 is provided on the cutting material holder 37 for pivoting it.

The cutting thickness of the cutting machine 30, i.e. the thickness of the slices of the material to be cut off during the cutting process, is determined by the distance of a guide wall 33 from the plane of the circular blade 31. This distance can be changed in a known manner by moving the guide wall 33 perpendicular to the plane of the circular blade 31 using an adjusting knob 36. The guide wall 33 serves as a stop plate for the material to be cut. Since in the view of Fig. 1 the material holder 37 and large parts of the carriage 40 are covered by the guide wall 33 and the circular blade 31, these covered parts are shown in dashed lines.

The end of the slide table 41 facing the user is formed by a front wall 52, which is designed as a hand guard 54 made of transparent plastic. The slide 40 can be pivoted on its guide mechanism about a horizontal axis located near the edge 44 for cleaning.

The described parts of the cutting machine 3 0 are arranged on a base frame 34 which rests on feet 35.

Fig. 2 shows the view of Fig. 1, but the cutting material holder 37 has been removed and instead the embodiment 1 of the grinding device according to the invention has been attached to the cutting machine 30. For clarity, the guide wall 33 and parts of the circular blade 31 and the round protective plate 38 are not shown.

The grinding device 1 comprises a fastening structure 5 made of metal or plastic. Two grinding wheels 3, 4, each serving as a grinding element 2, are rotatably mounted in bearings 6 in the fastening structure 5. While the lower grinding wheel 4, arranged at an angle to the plane of the circular knife 31, is used for the actual sharpening of the

9 α 9 **··

- 11 -

circular knife 31, the upper grinding wheel 3, which is arranged approximately parallel to the cutting phase of the circular knife 31, merely pulls off the circular knife 31 sharpened by the grinding wheel 4 for deburring and to achieve the desired knife shape.

Furthermore, a protective plate 11 made of transparent plastic is mounted on the fastening structure 5 by means of screw connections 15. The length of the protective plate 11 in the direction of the plane of the circular blade 31 corresponds at its lower edge 14 together with a projection of the fastening structure 5, which can be seen in particular in Figure 5, to the distance of the front wall 52 from the rear wall 53, i.e. the longitudinal extent of the slide table 41. In this way, the grinding device 1 can only be attached to the slide table 41 in a precisely defined transverse and longitudinal position, which in turn precisely determines the position of the grinding elements 3 and 4 in relation to the slide 40 and thus ensures increased grinding accuracy and depth. At the same time, the protective plate 11 serves to protect the user from accidentally touching the circular blade 31 or the grinding wheels 4 with fingers or hands during the grinding process.

Also part of the fastening structure 5 is an arm 7 which is pivotably connected to a joint 16 and which, in the position shown in the figures,

3 to 5, the arm 7 is arranged essentially transversely to the plane of the circular knife 31 and parallel to the carriage table 41 across it. The joint connection 16 allows the arm 7 to be folded in when the grinding device 1 is not in use, so that the grinding device 1 takes up less storage space when it is stored between sharpening operations.

The grinding device 1 rests on the slide table 41. In order not to have to grind the entire underside of the fastening structure 5 in accordance with the high precision of the manufacture of the slide table 41, the grinding device

device 1 rests only on three support cams 17 on the slide table 41. Of course, a corresponding surface grinding of the underside of the fastening structure 5 would also be possible.
5

The edge 42 of the carriage 40 adjacent to the circular knife 31 is gripped at two points 46, 47 by two hooks 8, 9 of the fastening structure 5, which are in contact with the edge 42 at these two points 46, 47 (cf. Fig. 3, 4, 5).

On the opposite edge 44 of the carriage 40, the end of the arm 7 carries a pin 13 which is arranged eccentrically in a corresponding receptacle 12 at the end of the arm 7. To clamp the grinding device 1 between the points 46 and 47 on the edge 42 on the one hand and the point 48 on the opposite edge 44 on the other hand, the pin 13 is rotated in its receptacle 12 so that it then presses against the edge 44 of the carriage 40 at the point 48 and acts as a third hook 10. In this way, the grinding device 1 can be clamped easily, quickly and safely on the carriage table 41 on the carriage 40. The construction of the grinding device 1 shown in Figures 2 to 4 is simple and elegant, it can be manufactured with little effort. The bracing between opposing edges 42, 44 of the carriage 40 via the arm 7 ensures an exact and precise alignment and guidance of the grinding wheels 3, 4 relative to the circular blade 31 and thus a high cutting precision, since the movable carriage 40 is aligned and guided relative to the circular blade 31 as precisely and accurately as possible in the factory on every cutting machine 30. The attachment points 46, 47 of the hooks 8, 9 can be easily reached for cleaning when the carriage 40 is pivoted.

Furthermore, it is clear that no specially designed fastening points are necessary on the carriage 40 for bracing the grinding device 1. This embodiment of the grinding device can therefore be used on practically any existing cutting machine, even as a replacement

for existing grinding devices. In order to adapt to the dimensions of the respective slide table, it can advantageously be provided that the arm 7 is adjustable in length, for example by means of holes arranged at suitably selected intervals for the passage of a screw connection member with the other components of the grinding device 1. As can be seen from the previous description, the grinding device according to the invention, in particular in its further development according to the exemplary embodiment, is superior to the known grinding devices in terms of the simplicity of its construction, the universality of its use, the achievable grinding quality and the ease of installation.

According to the state of the art, before a grinding device is put into operation on a cutting machine, the known grinding device is adapted to the existing angle and surface positions of the cutting machine in order to achieve optimal engagement between the grinding wheel intended for sharpening and the circular knife. This adaptation is necessary because the exact angular position of the carriage rear wall and the stop plate must be taken into account. After the grinding device has been adapted to the cutting machine in question, the grinding device in operation is given the same designation or number as the cutting machine, so that if several

■ cutting machines are present, the grinding device is not accidentally used to grind the circular blade of a cutting machine other than the one to which it has been adapted, 0

The grinding device according to the invention, of which an embodiment is shown, is, however, interchangeable, since the carriage edge 42 is exactly and always the same in every machine, in terms of the distance dimensions and in the angular position to the circular blade.

Claims (18)

- 14 - Claims 1. Grinding device for sharpening a circular blade of a cutting machine for food, in particular for cold cuts such as sausage, ham, cheese or the like, The grinding device - at least one grinding element, in particular a rotatably mounted grinding wheel and/or a rotatably mounted grinding cone for sharpening the circular blade and - the grinding device for the sharpening process can be attached to a carriage of the cutting machine in a predetermined position relative to the circular knife, which serves to support the food to be cut on a carriage table and can be moved parallel to the plane of the circular knife along the cutting area of the circular knife, characterized in that - the grinding device (1) can be clamped for attachment to the carriage table (41) between at least one point (46) on an edge (42) of the carriage (40) on the one hand and at least one further point (48) on the carriage (40) on the other hand.
30 2. Grinding device according to claim 1, characterized in that the grinding device (1) can be clamped for attachment to the carriage table (41) between at least two points (46, 47) on an edge (42) of the carriage (40) on the one hand and at least one further point (48) on the carriage (40) on the other hand. 3. Grinding device according to claim 1 or 2, characterized in that the grinding device (1) can be clamped for attachment to the slide table (41) between at least one point (46, 47) on the edge (42) of the slide (40) adjacent to the circular blade (31) on the one hand and at least one further point (48) on the slide (40) on the other hand. 4. Grinding device according to claim 3, characterized in that the grinding device (1) can be clamped for attachment to the slide table (41) between at least one point (46, 47) on the edge (42) of the slide (40) adjacent to the circular blade (31) on the one hand and at least one further point (48) on the opposite edge (44) of the slide (40) on the other hand. 5. Grinding device according to claim 4 in conjunction with claim 2, characterized in that the grinding device (1) can be clamped for attachment to the slide table (41) between at least two points (46, 47) on the edge of the slide (40) adjacent to the circular knife (31) on the one hand and at least one further point (48) on the opposite edge (44) on the other hand. 6. Grinding device according to one or more of the preceding claims, characterized in that the grinding device (1) comprises at least one hook (8, 9, 10) or at least one hook surface for contact in the position of use with an edge (42, 44) of the carriage (40) at one of the locations (46, 47, 48). 7. Grinding device according to claim 6, characterized in that the grinding device (1) comprises at least two hooks (8, 9) or at least one hook surface for contact with an edge (42) of the carriage (40) at at least two of the locations (46, 47). 8. Grinding device according to claim 7, characterized in that the grinding device (1) comprises at least three hooks (8, 9, 10) or at least one hook surface and at least one further hook or at least one further hook surface for contact with opposite edges (42, 44) of the carriage (40) at the at least three locations (46, 47, 48). 9. Grinding device according to one or more of claims 6 to 8, characterized in that the grinding device (1) comprises at least one arm (7) which is designed in the form of a hook at the end and which, in the position of use, is arranged essentially parallel to the slide table (41). 10. Grinding device according to claim 9, characterized in that the arm (7) is adjustable in length to adapt to the dimensions of the carriage table (41), for example by means of holes provided at suitably selected intervals for the passage of a screw connection member with the remaining component(s) of the grinding device (1). 11. Grinding device according to claim 9 or 10, characterized in that the arm (7) is designed to be foldable, retractable or removable in order to save space when the grinding device (1) is not in use. . Grinding device according to one or more of claims 0 9 to 11, characterized in that the hook (10) at the end of the arm (7) is designed to be movable for bracing the grinding device (1). . Grinding device according to claim 12, characterized in that the hook (10) is designed as a pin (13) which is mounted eccentrically rotatably in a corresponding receptacle (12) on the arm (7). 14. Grinding device according to one or more of the preceding claims, characterized in that the slide table (41) is closed off at its edge (45) located perpendicular to the plane of the circular blade (31) and adjacent to the user by a front wall (52) which is designed in particular as a hand guard (54) made of transparent plastic, and that the grinding device (1) can be brought completely or partially into contact with the front wall (52). 15. Grinding device according to claim 14, characterized in that the slide table (41) is attached to the front wall (52) opposite edge (43) is closed off by a rear wall (53), and that the length of the grinding device (1) in the direction parallel to the plane of the circular knife (31) in the position of use is designed to match the distance between the front (52) and rear (53) walls, i.e. to the length of the slide table (41). 16. Grinding device according to claim 15, characterized in that the grinding device (1) comprises a protective plate (11) made of transparent material, in particular transparent plastic, which in the position of use is arranged parallel to the plane of the circular blade (31) and whose longitudinal extent at its lower edge (14) corresponds at least approximately to the distance between the front wall and the rear wall of the carriage (40), ie the length of the carriage table (41). 17. Cutting machine for food, especially for cold cuts such as sausage, ham, cheese or similar, The cutting machine a circular knife for cutting the food - 18 cutting goods, a carriage for supporting the material to be cut on a carriage table, whereby the carriage can be moved parallel to the plane of the circular knife along the cutting area of the circular knife, and a grinding device for sharpening the circular knife, wherein the grinding device - at least one grinding element, in particular a contains a rotatably mounted grinding wheel and/or a rotatably mounted grinding cone for sharpening the circular blade and for the sharpening process in a position specified in relation to the circular knife on the carriage of the Cutting machine can be attached, characterized in that - the grinding device (1) can be clamped for attachment to the carriage table (41) between at least one point (46) on an edge (42) of the carriage (40) on the one hand and at least one further point (48) on the carriage (40) on the other hand.
25 18. Cutting machine according to claim 17, characterized in that the cutting machine (3 0) or its grinding device (1) are developed according to one or more of claims 2 to .
30