EP2759374A2 - Device and method for grinding at least one separating blade fixed on a blade drum and driven rotating separating blade - Google Patents

Abstract

The device (10) has a sanding roll carrier (13) comprising sanding rolls (14, 14A) that are assigned to a sanding roll carrier swingable by a slewing mechanism (19). The sanding roll carrier is movably formed such that the sanding rolls are arranged transverse to sharpening axles and disengaged with a separation knife (12). A cleaning device (15) cleans a surface of the sanding rolls. A cleaning chamber (22) is formed to receive the sanding rolls. The cleaning chamber comprises an entrance terminal and an output terminal for cleaning mediums.

Description

The invention relates to a device, designed and arranged for grinding at least one arranged on a cutterhead, which is circumferentially drivable about a drum axis I within a device for separating tobacco from a tobacco cake, separating knife, comprising a Schleifwalzenträger with at least one grinding rollers, which around a Grinding axes II is driven in rotation, as well as means for cleaning the surface O each grinding roller.

Furthermore, the invention relates to a method for grinding at least one separating knife arranged on a cutterhead, which is driven circumferentially about a drum axis I within a device for separating tobacco from a tobacco cake, comprising the steps of: grinding each cutting knife with one about the grinding axis II rotatably driven, in engagement with the grinding knife to be ground cutting wheel, and cleaning the grinding roller with a standing in operative connection with the cleaning roller to be cleaned device for cleaning the surface O of the grinding roller.

Such devices and methods are used in the tobacco processing industry to grind severing blades of a tobacco cutter during the separation process. With the tobacco cutter or cutting blades of the tobacco cutter, a previously compacted, cut-resistant tobacco cake is cut into short tobacco fibers. For this purpose, a cutterhead has at least one cutting knife, but usually several cutting blades, which are distributed uniformly over the circumference of the cutterhead. By separating the tobacco fibers from the tobacco cake and possible foreign substances in the tobacco cake, the cutting blades are subject to wear. In addition to wear, there is also a considerable contamination by tobacco dust, tobacco sauces and the like. In particular, the tobacco sauces settle on the cutting edges of the cutting knife. In order to maintain the quality of the cut, the separating blades are guided past the drum axis I on the device for grinding during each rotation. The cutting blades form or describe by the rotation about the drum axis I a cutting circle. This cutting circle must be brought into coincidence with a grinding roller or its grinding circle. In other words, the cutting circle and the grinding circle described by the grinding roller must touch each other. In other words, the grinding circle crosses the cutting circle, so that each cutting knife is cyclically reground, namely preferably once each time the drum is revolved. By grinding the cutting blades shorten these. However, since the cutting circle should always have an identical radius, the cutting blades to compensate for the reduction in length are readjustable, such that the cutting blades always protrude by a constant amount over the circumference U of the blade drum.

For grinding the cutting blades, devices are known in which a grinding wheel or sanding roller grinds the cutting blades by the grinding wheel or sanding roller whose width is usually much smaller than the width of the cutting knife, known to be a factor of 10, from one side to the other side is moved back and forth. By traversing the grinding wheel / sanding roller over the entire width of the separating knife, individual points of the separating blade width are ground only sporadically. Furthermore, due to the wide traversing of the grinding wheel / sanding roller across the entire width, an uneven sanding pattern is produced, which has an adverse effect on the quality of the cut.

When separating the tobacco fibers from the tobacco cake not only the cutting blades but also the grinding wheel / sanding roller are exposed to considerable contamination by tobacco dust and in particular also tobacco sauces and the like. These contaminants settle on the grinding wheel / grinding roller, which is why the surface of the grinding wheel / grinding roller has to be reworked. The example of grinding rollers with a surface of cubic boron nitride (CBN), which need not be dressed for lack of relevant wear, the grinding rollers or their surfaces are cleaned or washed. For this purpose, the grinding rollers are charged with a cleaning medium. To perform the cleaning of the sanding rollers, they must be cleaned separately and shielded from the cutterhead within a device for cleaning. This cleaning process requires in particular because of the supply and removal of the cleaning medium and the shield to the cutterhead or the environment a considerable design and time. In any case, the grinding process for cleaning the grinding wheel / grinding roller must be interrupted for a long period of time. This can also lead to interruptions of the separation process.

Such a grinding device, which is disadvantageous in terms of achievable quality cut, which depends, inter alia, on the quality of grinding, and the handling is, for example, from EP 1 479 478 A2 known from the house of the applicant. The device described therein comprises a single abrasive body arranged in a housing which is reciprocated from side to side because of the smaller width of the grinding wheel for grinding the separating blade width, as compared to the separating blade width. To clean the grinding wheel, it is pivoted together with a housing permanently surrounding the grinding wheel from the grinding position into a position out of engagement with the separating knives. When the housing is disengaged from the abrasive body, the housing is completely closed to perform cleaning in a confined space. After cleaning, the entire unit is pivoted back to the grinding position after opening the cleaning chamber. This handling is very complex and structurally complex and because of the complex cleaning process leads to a longer interruption of the grinding process. The interruption can take up to 60sec. Incidentally, due to the wide traversing of the grinding wheel over the entire width of the separating knife, an uneven ground pattern is produced, which has an adverse effect on the quality of the cut.

The invention is therefore an object of the invention to provide a grinding device by means of a time and quality-optimized grinding of the cutting blade of a tobacco cutter is realized. The object continues to be to propose a corresponding method.

This object is achieved by a device having the features mentioned above in that the grinding roll carrier two grinding rollers are assigned, which are pivotable about a pivot axis III by means of a pivoting mechanism, wherein the grinding roll carrier is movable, such that the grinding rollers transverse to the grinding axis II in And in that the means for cleaning the surface O of the sanding rollers comprises a cleaning chamber adapted and arranged to receive one of the sanding rollers, the cleaning chamber having at least one access port and a cleaning fluid outlet port includes. The fact that two grinding rollers are provided, the interruption of the grinding process can be significantly shortened, since only in the swing phase no grinding is possible. Namely, one of the grinding rollers is in the grinding position while the other grinding roller is in the cleaning position. While one sanding roller grinds the separating blades, the other sanding roller is cleaned by the full width cleaning device. In other words, one of the grinding rollers, with the exception of the pivoting operation, can be brought into permanent sliding contact with the or each cutting blade to be ground, while the other grinding roller is permanently connected to the device for cleaning and vice versa. As a result, grinding is particularly effective in terms of time and quality. Due to the movability of the grinding roller carrier, the grinding rollers, which are each located in the grinding position, can be brought out of engagement with each separating knife in order to initiate the pivoting operation (in the direction of the arrow T ₁ ). The access port and the exit port for the cleaning medium ensure easy and quick cleaning of the entire sanding roller.

Advantageously, the grinding roller carrier is arranged on a linearly movable guide carriage, whereby the mobility of the grinding rollers for the procedure between engagement with a cutting knife and the disengaged position is particularly fast and precise executable.

According to the invention, the device is further developed in that the cleaning chamber is formed from two half-shell elements, which are used to form a On all sides closed receiving space for the respective grinding roller to be cleaned towards each other and away from each other are formed movable. In the open position of the half-shell elements, the cleaning chamber is adapted to receive a cleaning roller to be cleaned. In the closed position of the half-shell elements of the sealed off from the environment receiving space in which one of the grinding rollers is arranged, designed and set up for thorough and rapid cleaning of the grinding roller. The embodiment according to the invention provides an easy-to-handle and effective cleaning chamber in the cleaning position. The cleaning is because of the resulting tobacco dust and in particular the tobacco sauce and the like for the grinding result of particular importance, which is why the inventive device for cleaning contributes a special contribution to increasing the quality of the grinding result.

Advantageously, the means for cleaning the surface O of the grinding rollers comprises sealing means for sealingly closing the cleaning chamber. This ensures a grinding process protective cleaning of the grinding roller located in the cleaning chamber.

Expediently, a development of the device according to the invention has a cleaning chamber which comprises an inlet for water, a feed for steam and a feed for compressed air and a drain for the wastewater. The separate access ports for the supply of different cleaning media or cleaning media of different states of aggregation efficient and rapid cleaning is achieved. The cleaning cycles can therefore be carried out at closer intervals, which has a positive effect on the quality of the grinding rollers and thus the cutting knife.

The abovementioned embodiments can be optimized according to the invention in that each grinding roller has a (grinding) width that is slightly larger than the (cutting) width of the separating blades. This means that each grinder roller engaged with the severing knife protrudes laterally beyond the severing knife, so that a nearly permanent grinding of the severing knife over the entire Width is done. This creates a uniform microsection to increase the quality of the cut. Another advantage of this embodiment is that it can be dispensed with a relative movement between the grinding roller and separating knife. As a result, all individual points (across the width) of the cutting blades are ground simultaneously and uniformly, which leads to a quality-optimized grinding. By the uniform grinding of the cutting blade, moreover, the life of the cutting blade can be increased, since the knife feed, so the Nachschieben the cutting blade, can be selected smaller. The term "minor" - based on the width of the sanding roller or the supernatant against the cutting blades - means that the sanding roller must survive only minimally on the cutting blade. Of course, a larger projection, so a clear survive, possible.

In a further embodiment of the invention, the drum axis I and the grinding axis II extend parallel and obliquely to one another. Due to the inclination or tilted position of the grinding roller to the cutterhead or vice versa, the deflection of the grinding roller or the curvature of the surface of the grinding roller can be compensated. This also improves the microsection. As mentioned, the grinding roller can laterally protrude significantly beyond the cutting knife. This is particularly important for the inclination of the sanding roller to the cutterhead, because then despite the inclination always a cut can be made over the entire width of the cutting blade.

The object is also achieved by a method with the steps mentioned above, that during grinding of the separating knife with the grinding roller located in the grinding position, a second grinding roller in the cleaning position within a cleaning chamber of the device for cleaning the surface O of the grinding wheels and with a Cleaning medium is cleaned, and that the grinding rollers are pivoted about a pivot axis III by means of a pivoting mechanism to pivot the just cleaned grinding roller from the cleaning position to the grinding position and the grinding roller currently in engagement with a separating knife from the grinding position to the cleaning position, and vice versa, one carrying the two sanding rollers Grinding roller carrier is moved transversely to the grinding axis II of the grinding rollers to bring the grinding wheel in each case in the grinding position for pivoting out of engagement and after pivoting again in grinding engagement with the cutting blades to be ground.

Advantageously, the grinding roller carrier is moved linearly with the grinding rollers by means of a guide carriage back and forth.

Preferably, the cleaning of the grinding rollers in the cleaning position by two half-shell elements, including the respective to be cleaned grinding roller to form a fully closed receiving space to each other to be moved, cleaning medium supplied to the cleaning chamber and discharged again, and the half-shell elements and after cleaning the grinding roller be moved away from each other again.

It is particularly advantageous if the cleaning roller to be cleaned is subjected to water and steam for cleaning in a receiving space of the cleaning chamber that is sealed off from the environment, and then dried with compressed air.

The method is inventively further developed in that a cutting knife is ground simultaneously by a grinding roller over the entire width M _B.

Further advantages resulting from the individual method steps have already been explained in connection with the device, for which reason reference is made to the corresponding statements in order to avoid repetition.

The method according to the invention can be carried out particularly advantageously with the device according to the invention as claimed in any one of claims 1 to 6, as explained above.

Fig. 1

eine schematische Darstellung einer Ausführungsform der erfindungsgemäßen Schleifvorrichtung mit einer geschlossenen Reinigungskammer in Seitenansicht,

Fig. 2

die Schleifvorrichtung gemäß Figur 1 in Draufsicht, wobei lediglich eine Hälfte der Schleifvorrichtung entlang der Symmetrieachse dargestellt ist,

Fig. 3

die Schleifvorrichtung gemäß Figur 1 mit einer geöffneten Reinigungskammer, und

Fig. 4

die Schleifvorrichtung gemäß Figur 3 in Draufsicht, wobei lediglich eine Hälfte der Schleifvorrichtung entlang der Symmetrieachse dargestellt ist.

Further expedient and / or advantageous features and development of the invention will become apparent from the dependent claims and the description. Especially preferred embodiments of the invention will be explained in more detail with reference to the accompanying drawings. In the drawing shows:

Fig. 1

a schematic representation of an embodiment of the grinding device according to the invention with a closed cleaning chamber in side view,

Fig. 2

the grinding device according to FIG. 1 in plan view, wherein only one half of the grinding device is shown along the axis of symmetry,

Fig. 3

the grinding device according to FIG. 1 with an open cleaning chamber, and

Fig. 4

the grinding device according to FIG. 3 in plan view, wherein only one half of the grinding device is shown along the axis of symmetry.

The invention will be described with reference to a device for grinding cutting knives of a tobacco cutter. Of course, the invention extends to all devices for grinding rotary driven knives. The invention can be directed both to a separate grinding device as a single component ("stand-alone device") as well as to a cutting device with such a grinding device.

The device 10 shown in the drawing is designed and arranged for grinding at least one separating knife 12 arranged on a knife drum 11, which can be driven in rotation around a drum axis I within a device for separating tobacco from a tobacco cake. The apparatus 10 comprises a grinding roll carrier 13 with at least one grinding roller 14 which can be driven to rotate about a grinding axis II, and a device 15 for cleaning the surface O of each grinding roller 14. The cutterhead 11 can be equipped with a separating knife 12. Preferably, however, several, for example, eight cutting blades 12 are evenly distributed over the circumference. The separating blades 12 protrude beyond the peripheral surface U of the cutterhead 11. The knife drum 11 can be driven in rotation about the drum axis I by drive means, not shown. Thereby all describe separating knife 12 has a cutting circle S _K, which is always, regardless of the wear of the cutting knife 12 has the same diameter. To ensure this, the cutting blades 12 are adjustable. Optionally, the separating knife advance is clocked or - preferably - formed continuously.

Each grinding roller 14 is - in contrast to a grinding wheel - an abrasive body with a width S _B , wherein the width S _B corresponds to at least half the width M _{B of} the cutting knife 12 to be ground. Each grinding roller 14 is driven by means not shown drive means rotating about the grinding axis II. As a result, the peripheral surface or its surface O of the grinding roller 14 describes a grinding circle. In the invention, the abrasive roller 14 is at least in the surface coating of cubic boron nitride (CBN), which can be cleaned by the means 15 for cleaning the surface O of the grinding roller 14.

This device 10 according to the invention is characterized in that the grinding roll carrier 13, two grinding rollers 14, 14A are assigned, which are pivotable about a pivot axis III by means of a pivot mechanism 19 (see arrow T ₄ ). The grinding roll carrier 13 is designed to be movable, such that the grinding rolls 14, 14A are transversely (see arrow direction T ₁ ) to the grinding axis II in grinding engagement and out of engagement with the cutting blade 12 to be ground, and that the means 15 for cleaning the surface O of Grinding rollers 14 comprises a cleaning chamber 22, which is designed and adapted to receive one of the grinding rollers 14, 14A, wherein the cleaning chamber 22 comprises at least one access port and a discharge port for the cleaning medium.

With the pivoting mechanism 19, which will be described later, a grinding roller 14 is held in the grinding position while the other grinding roller 14A is held in the cleaning position (see, for example, FIG FIG. 1 ). By the pivoting mechanism 19, the previously located in grinding position grinding roller 14 in the cleaning position and the previously located in the cleaning position grinding roller 14 A in the grinding position (see, eg FIG. 3 ) and vice versa. For this purpose, the grinding rollers 14, 14A by means of the pivot mechanism preferably about 180 ° about a pivot axis III pivotally (see arrow T ₄ ).

The features and developments described below represent individually or in combination with each other preferred embodiments. It is expressly understood that features that are summarized in the claims and / or the description or described in a common embodiment, also functionally independent the can further develop device 10 described above.

The grinding roll carrier 13 with the two grinding rolls 14, 14A is preferably arranged on a linearly movable guide slide 16. In the embodiment according to the Figures 1 and 2 the other grinding roller 14A is in cleaning position in operative connection with the device 15 for cleaning the surface O of each grinding roller 14, 14A, namely within the cleaning chamber 22. The cleaning chamber 22, which consists of two Half-shell elements 23, 24 may be formed is closed. In the closed position of the half-shell elements 23, 24, a receiving space 25 closed on all sides is formed, in which the grinding roller 14 or 14A to be cleaned is held. To carry out a change of position of the two sanding rollers 14, 14A, the cleaning chamber 22 can be opened. The half-shell elements 23, 24 are preferably designed towards one another and movable away from one another. The opening and closing can be done by swiveling elements. In the described embodiment, both half-shell elements 23, 24 are movable in a linear direction vertical to the grinding axis II (see arrow direction T ₃ ). In other embodiments, only one half-shell element 23 or 24 may be movable relative to the other half-shell element 24 or 23. An open position of the half-shell elements 23, 24 is the FIG. 3 refer to.

The half-shell elements 23, 24, in addition to the movement from top to bottom and vice versa (arrow T ₃ ) also transversely to the grinding axis II on the grinding roll carrier 13 to and from this movable away (see arrow T ₂ ). Thus, the cleaning chamber 22 itself out of the cleaning position and again moved back. The individual movements according to the arrow directions T ₁ and / or T ₂ and / or T ₃ are also superimposed on each other. The device 15 for cleaning the surface O of the grinding rollers 14, 14A also includes sealing means 26 for sealingly closing the cleaning chamber 22. By way of example, a simple flat gasket is shown. The decisive factor, however, is that the housing forming the cleaning chamber 22 closes off or closes off the receiving space 25 from the surroundings so far that the grinding roller 14 or 14A located in the grinding position is protected from the cleaning medium.

Preferably, the cleaning chamber 22 comprises a feed 27 for a liquid medium, for example water with or without solvent, a feed 28 for a vaporous medium, for example water vapor, a supply 29 for compressed air and a discharge 30 for the wastewater. The inlets 27, 28 and feed 29 are preferably arranged in the upper half-shell element 23, while the drain 30 is preferably arranged in the lower half-shell element 24. The number, design, and arrangement of the access ports and output ports may vary.

The grinding axes II and the drum axis I can lie in a common horizontal plane. However, an axial offset is preferred. In the embodiment of the drawing, the grinding axis II lies in a plane by the amount a above the drum axis I. However, this amount a may vary in size. Due to the axial offset, the wedge angle of the separating knife 12 can be influenced at least to a small extent.

The grinding rollers 14, 14 A have a width S _B , which corresponds to at least half of the width M _{B of} the cutting blade 12. However, as long as the width S _B is smaller than the width M _B , the grinding rollers 14, 14 A are movable relative to the cutterhead 11 in order to be able to grind the separating blades 12 over their entire width M _B. The relative movement between the grinding rollers 14, 14A or at least the grinding roller 14 or 14A and cutting knife 12 in the grinding position can be achieved by an axial movement of the grinding roller 14 or 14A and / or the cutterhead 11 and / or the cutting knife 12 parallel to the drum axis I and of the grinding axis II in The longitudinal direction thereof are generated. Particularly preferably, the width S _{B of} each grinding roller 14, 14A is slightly greater than the width M _{B of} the separating blades 12. In other words, the grinding rollers 14, 14A project beyond the separating blade 12 on both sides.

The width M _{B of} the cutting blade 12 may for example be between 400mm and 600mm. Correspondingly, the sanding rolls 14, 14A have a width S _B of at least 200mm to 300mm and preferably also 400mm to 600mm, and more preferably plus a minimum overhang on both sides from a few mm to a larger overhang on both sides of a plurality mm.

The drum axis I and the grinding axes II can parallel and rectified (ie, lying in parallel planes), as in the embodiments of FIGS. 1 to 4 shown. The drum axis I and the grinding axes II can also be parallel and oblique to each other. In the latter example, the grinding rollers 14, 14A are tilted relative to each other at least in the grinding position and the cutterhead 11, so that the two axes I and II are parallel, but in different, intersecting planes.

The pivoting mechanism 19 for the two sanding rollers 14, 14A includes a drive means (not explicitly shown) for pivoting the sanding rollers 14. The pivoting mechanism 19 may comprise means for pivoting each sanding roller 14, 14A per se or synchronously pivoting both sanding rollers 14, 14A. The grinding rollers 14, 14A are optionally arranged on a common support 21, which is pivotable about the pivot axis III or circumferentially rotatable. The two grinding rollers 14, 14A can be driven by individual drives or by a common synchronous drive. The position of the grinding rollers 14, 14A on the carrier 21 may be stationary and provided at a fixed distance from each other. Optionally, however, the grinding rollers 14, 14A can also be designed to be adjustable relative to the carrier 21. The pivoting mechanism 19, like the guide carriage 16, may be supported and / or guided in the region of a housing wall 20 or the like.

The devices 10 described above are available as a single component, e.g. as retrofit kit or spare part, can be used. Optionally, however, these devices 10 are part of a cutting device 31, in particular a tobacco cutter, which in addition to the device 10 further comprises a rotatingly driven cutterhead 11 with at least one cutting knife 12.

The method according to the invention is described in more detail below: Each separating knife 12, which is arranged on a knife drum 11 driven in rotation about the drum axis I, is ground by a grinding roller 14, which is driven to rotate about the grinding axis II and engages with the separating knife 12 to be ground engaged. The grinding takes place when the grinding circle of the grinding roller 14 and the cutting circle S _{K of} the cutting blade 12 touch or intersect. In order to keep the cutting teeth constant, each grinding roller 14 is cleaned. For this purpose, the surface O of each grinding roller 14 is cleaned by means 15 for cleaning the surface O of the grinding roller 14.

This method is inventively characterized in that during grinding of the cutting knife 12 with the grinding roller 14 in the grinding position, a second grinding roller 14A in the cleaning position within a cleaning chamber 22 of the device 15 for cleaning the surface O of the grinding wheels 14, 14A and with a cleaning medium is cleaned (see, eg FIG. 1 ), and that the grinding rollers 14, 14A are pivoted about a pivot axis III by means of a pivoting mechanism 19 to move the just cleaned grinding roller 14A from the cleaning position to the grinding position and the grinding roller 14 just in engagement with each separating knife 12 from the grinding position to the cleaning position to swing (see eg FIG. 3 ) and vice versa, wherein a grinding roll carrier 13 carrying the two grinding rolls 14, 14A is moved transversely to the grinding axis II of the grinding rolls 14, 14A to disengage the respective grinding position grinding rolls 14 or 14A for pivoting and, after pivoting, to again engage with the grinding rolls To bring to grinding cutting blades 12.

The principle of the invention is based on the position of the grinding rollers 14, 14A according to the Figures 1 and 2 namely with the grinding roller 14 in the grinding position and the grinding roller 14A in the cleaning position. The grinding roller 14 grinds the or each cutting knife. In the event that the width _B S of the grinding roller 14 is less than the separating knife width M _B, a relative movement between the grinding roll located in grinding position 14, and generates the separating knife to be ground 12th For this purpose, the grinding roller 14 over the entire width M _{B of} the cutting blade 12 are moved back and forth. Alternatively, the knife drum 11 and / or the separating knife 12 itself can be moved longitudinally along the drum axis I. Because of the said width S _{B of} the grinding roller 14, which corresponds to at least half of the width M _{B of} the cutting blade 12, only small transverse movements are necessary. Incidentally, the fact that always at least half of the width M _{B of} the cutting blade 12 is ground simultaneously, achieved a fast grinding with a uniform grinding pattern. In the event that the width S _{B of} the grinding rollers 14 is equal to or greater than the width M _{B of} the cutting blade 12, can be dispensed with the relative movement between the grinding roller 14 and the separating knife 12. As a result, an even smoothened image is generated since all individual points of the severing blade width M _B are ground simultaneously and continuously.

As the grinding roller 14 grinds the separating blades 12, at the same time, the grinding roller 14A is cleaned. For this purpose, cleaning medium is supplied to the receiving space 25. Preferably, the sanding roller 14A is cleaned with water and steam and dried by compressed air. The wastewater is discharged. For a position change of the grinding rollers 14, 14A, the panning operation is prepared by first completely stopping the cleaning process by stopping the supply of liquid and vapor cleaning media to the abrasive roller 14A and drying it while (fouling ) Wastewater is drained. Once the grinding roller 14A is dried and the waste water is drained, the cleaning chamber 22 is opened, for example by moving the two half-shell elements 23, 24 away from each other in the direction of arrow T ₃ . As soon as the grinding roller 14A is completely released, the two grinding rollers 14, 14A are moved linearly by a guide carriage 16 transversely to the grinding axis II Knife drum 11 moves away until the grinding roller 14 is out of engagement with the or each cutting knife 12. Once the abrasive roll 14 is disengaged from the knife blades 12, the abrasive rolls 14, 14A are pivoted about the pivot axis III, preferably about 180 °, until the abrasive roll 14 is in the cleaning position and the abrasive roll 14A is in the grinding position. Then, both of the grinding rollers 14, 14A can be linearly moved toward the cutterhead 11 by the guide carriage 16 across the grinding axis II until engagement of the grinding roller 14A with each cutter knife 12 is established. At least partially superposed in time or subsequently, the two half-shell elements 23, 24 can be closed again by being moved toward one another in the direction of arrow T ₃ until the receiving space 25 is closed. Once the abrasive roller 14A to be cleaned is sealed off from the environment, cleaning media can be rinsed, pressed or otherwise fed into the receiving space 25 again.

The half-shell elements 23, 24 can also be moved transversely to the grinding axis II in the direction of the arrow T _{2 in} addition to the vertical movement along the direction of the arrow T ₃ , for example to completely release the grinding roller 14 or 14A to be cleaned or cleaned.

Claims (12)

Device (10), designed and arranged for grinding at least one on a knife drum (11), which is circumferentially drivable about a drum axis I within a device (31) for separating tobacco from a tobacco cake, arranged separating knife (12) comprising a Schleifwalzenträger (13) with at least one grinding roller (14), which is drivable to rotate about a grinding axis II, and a device (15) for cleaning the surface O of each grinding roller (14), characterized in that the grinding roll carrier (13) has two grinding rollers (14 , 14A) pivotable about a pivot axis III by means of a pivoting mechanism (19), the grinding roll carrier (13) being movable such that the grinding rolls (14, 14A) are gripped and disengaged transverse to the grinding axis II the separating blade (12) to be ground, and in that the device (15) for cleaning the surface O of the grinding rollers (14, 14A) is a cleaner Compression chamber (22) adapted and adapted for receiving one of the grinding rollers (14, 14A), wherein the cleaning chamber (22) comprises at least one access port and a discharge port for a cleaning medium. Apparatus according to claim 1, characterized in that the grinding roll carrier (13) on a linearly movable guide carriage (16) is arranged. Apparatus according to claim 1 or 2, characterized in that the cleaning chamber (22) of two half-shell elements (23, 24) is formed, which for forming a mutually closed receiving space (25) for each to be cleaned grinding roller (14, 14A) toward each other and formed movable away from each other. Device according to one of claims 1 to 3, characterized in that the means (15) for cleaning the surface O of the grinding rollers (14, 14, 14A) comprises sealing means (26) for sealingly closing the cleaning chamber (22). Device according to one of claims 1 to 4, characterized in that the cleaning chamber (22) an inlet (27) for water, an inlet (28) for steam and an inlet (29) for compressed air and an outlet (30) for the wastewater includes. Device according to one of claims 1 to 5, characterized in that each grinding roller (14, 14A) has a (grinding) width S _B , which is slightly larger than the (cut) width M _{B of} the separating knife (12). Device according to one of claims 1 to 6, characterized in that the drum axis I and the grinding axes II parallel and oblique to each other. Method for grinding at least one separating knife (12) arranged on a cutterhead (11), which is driven around a drum axis I within a device (31) for separating tobacco from a tobacco cake, comprising the steps: - Grinding of each cutting knife (12) with a rotating about the grinding axis II driven, in engagement with the cutting knife to be ground (12) located grinding roller (14), and Cleaning the sanding roller (14) with a device (15) in operative connection with the sanding roller (14) to be cleaned for cleaning the surface O of the sanding roller (14),
characterized in that during grinding, the separating knife (12) with the grinding roller (14) in the grinding position, a second grinding roller (14A) in the cleaning position within a cleaning chamber (22) of the device (15) for cleaning the surface O of the grinding wheels (14) 14, 14A) and cleaned with a cleaning medium, and that the grinding rollers (14, 14A) are pivoted about a pivot axis III by means of a pivoting mechanism (19) pivoting the currently cleaned grinding roller (14A) from the cleaning position to the grinding position and the grinding roller (14) currently in engagement with a separating knife (12) from the grinding position to the cleaning position and vice versa, one of the two grinding rollers (14, 14A) supporting grinding roll carrier (13) is moved transversely to the grinding axis II of the grinding rollers (14, 14A) to disengage the respectively in grinding position grinding roller (14 or 14A) for pivoting and after pivoting again in grinding engagement with the cutting blades to be ground (12) bring to. A method according to claim 8, characterized in that the grinding roll carrier (13) with the grinding rollers (14, 14A) by means of a guide carriage (16) is moved linearly back and forth. A method according to claim 8 or 9, characterized in that the cleaning of the grinding rollers (14, 14A) takes place in the cleaning position by two half-shell elements (23, 24) including the respectively to be cleaned grinding roller (14 or 14A) to form a closed on all sides Receiving space (25) are moved toward each other, cleaning medium in the cleaning chamber (22) is fed and discharged again, and the half-shell elements (23, 24) and after cleaning the grinding roller (14 or 14A) again moved away from each other. Method according to one of claims 8 to 10, characterized in that the cleaning roller (14 or 14A) to be cleaned in a sealed relative to the environment receiving space (25) of the cleaning chamber (22) for cleaning with water and steam and then dried with compressed air , Method according to one of claims 8 to 11, characterized in that a separating knife (12) by a grinding roller (14 or 14A) over the entire width M _B is ground simultaneously.

Images