EP2346363B1 - Cutting apparatus - Google Patents
Cutting apparatus Download PDFInfo
- Publication number
- EP2346363B1 EP2346363B1 EP09785600.9A EP09785600A EP2346363B1 EP 2346363 B1 EP2346363 B1 EP 2346363B1 EP 09785600 A EP09785600 A EP 09785600A EP 2346363 B1 EP2346363 B1 EP 2346363B1
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- EP
- European Patent Office
- Prior art keywords
- cutting
- axis
- rotation
- drum
- grinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005520 cutting process Methods 0.000 title claims description 133
- 241000208125 Nicotiana Species 0.000 claims description 34
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 34
- 230000033001 locomotion Effects 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 description 11
- 235000019504 cigarettes Nutrition 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 235000013351 cheese Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
- B24B3/363—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of blades mounted on a turning drum
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B7/00—Cutting tobacco
- A24B7/04—Cutting tobacco by machines with revolving knives
- A24B7/08—Cutting tobacco by machines with revolving knives with several knives which act one after the other
- A24B7/12—Cutting tobacco by machines with revolving knives with several knives which act one after the other with cutter axes transverse to the feeding direction
Definitions
- the present invention relates to cutting apparatus and a method of cutting, particularly, but not exclusively to a cutting apparatus and method of cutting for cutting portions of a laminar product such as tobacco leaves.
- Tobacco leaves are processed for cigarette manufacture in a primary tobacco process.
- the laminate portions of the tobacco leaves are compressed and then cut in a cutting machine to create tobacco particles suitable for cigarette manufacturers.
- the width of cut is between 0.7 and 1.0mm.
- the length of the tobacco strands produced is highly variable, ranging from less than 1 mm to more than 200mm. The maximum length of particle depends on the sizes of the lamina portions being cut, and these ultimately depend on the dimensions of the leaves from which they came.
- WO85/104616 An example of a technique limiting the maximum length of strands of cut tobacco by the use of castellated or ribbed knives is described in WO85/104616 .
- the maximum length of tobacco strands is limited to the distance between the ribs, or alternatively, the pitch of the castellations of the knives.
- the maximum strand length would be limited to between 20 - 40 mm although other dimensions are feasible.
- the type of castellated or ribbed knife described in WO85/104616 can be expensive to produce due to the preparation and machining of the knives to the required shape or profile.
- GB 969601 describes a knife for a tobacco cutting machine that has a blade of high resistance to wear, e.g. tungsten carbide, whose cutting edge is an arc to which the faces of the blade are tangential and whose radius is at least one thousandth of an inch.
- the tobacco is fed by conveyers which have transverse ribs and converge at their forward ends towards a rectangular mouthpiece whose sides are formed as arcs of a circle. Extending across the mouthpiece is a cutter wheel carrying twelve equally spaced knives clamped between the interlocking parts of a holder secured to a flat on a wheel.
- GB 2143450 describes a method of grinding the elongated undulate cutting edge of a knife, which orbits along an endless path about a predetermined axis in a tobacco cutting machine, by means of a rotary grinding wheel.
- the wheel is movable relative to the orbiting knife and has a profile that is complementary to that of the cutting edge.
- the method comprises the steps of advancing the grinding wheel stepwise relative to the orbiting knife longitudinally of the cutting edge; and moving the profile of the grinding wheel into contact with different portions of the cutting edge between stepwise advances of the grinding wheel.
- the present invention allows the maximum length of the strands of cut tobacco to be limited as described above, but by employing standard plain knives combined with a special mode of operation of the cutting machine knife grinding system.
- a disadvantage of the use of ribbed or castellated knives is that a large proportion of the knife material has to be removed by expensive and accurate machining operations during the manufacture of the knives. This results in a cost for these consumable items which is several times the cost of the equivalent standard knives.
- the present invention provides a cutting apparatus comprising the features of claim 1.
- a controlled strand length cutting operation can be achieved with standard, non-profiled knife or knives.
- the knives used may be of a uniform thickness and do not need to be produced with an expensive machining operation. The overall cost of the apparatus is thus reduced and replacement parts more easily obtained.
- The, or each knife may be configured to be to be fed in a direction away from the axis of rotation of the cutting drum and towards the cutting position at the mouth, with this arrangement the knives are moved towards the cutting position and can advantageously make repeatable, reliable cuts at the material to be cut.
- the grinder may be configured to be rotated about an axis arranged substantially parallel to the axis of rotation of the cutting drum at the cutting position allowing the grinder ease of access to the knives to be ground and such that the cutting edge is arranged to lie on an imaginary cylindrical surface.
- the cutting apparatus may comprise a clamp assembly for compressing the material to be cut at the cutting position. By this arrangement the material to be cut can be presented at the cutting edge in an extruded and compressed manner and with a substantially uniform composition.
- the cutting apparatus comprises a control assembly configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum.
- the control assembly is configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum in a series of one or more discrete movements, such that the grinder moves in a substantially castellated motion.
- control assembly is configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum and is configured to control the movement in a direction substantially parallel to the axis of rotation of the cutting drum, wherein the speed of movement the grinder in the direction substantially perpendicular to the axis or rotation of the cutting drum is faster than the speed of movement of the grinder in the direction substantially parallel to the axis of rotation of the cutting apparatus.
- This configuration is found to be particularly useful for grinding a knife with a castellated profile.
- the control assembly may comprise a pivoted arm and a geared stepper. The control assembly may adjust the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum in the range from 0.2mm to 2.5mm and is found to be particularly useful for cutting controlled length sections of a material.
- the cutting edges of the at least one knife may be arranged such that the cutting edges correspond to the mouth. It is preferable to provide the mouth parts with a profile corresponding to the profile of the knives, so that the minimum clearance between the knives and the mouth parts is maintained at all points across the cutting width.
- the present invention provides a method of manufacture of controlled strand length tobacco, configured with the aforementioned cutting apparatus. Also discloses is a method of manufacture for controlled strand length tobacco, comprising the steps of:
- the step of moving the grinder may comprise the step of moving the grinder in a series of one or more discrete movements in a direction substantially parallel to the axis of rotation of the cutting drum and in a direction substantially perpendicular to the axis of rotation of the cutting drum, thereby grinding the cutting edge with a castellated profile.
- the step of moving the grinder may comprise the step of moving the grinder in a series of one or more gradual movements in a direction substantially parallel to the axis of rotation of the cutting drum and in a direction substantially perpendicular to the axis of rotation of the cutting drum, thereby grinding the cutting edge with an undulating profile.
- the method may comprise a step of compressing the extruded tobacco material at the jaw assembly.
- a first longitudinal dimension and a second longitudinal dimension are described.
- a first longitudinal dimension is a dimension measured substantially along the axis of rotation of the cutting drum and hereinafter referred to also as length (of, for example, cut strands) and width (of, for example, cutting drum).
- the length of the cut strands of tobacco is therefore a measurement of the dimension of the strand substantially in the direction of the axis of rotation of the cutting drum.
- the width of the cutting drum is therefore a measurement of the dimension of the cutting drum substantially in the direction parallel to its axis of rotation, and the width of the mouth is therefore a measurement of the dimension of the mouth opening in a direction substantially parallel to the axis of rotation of the cutting drum.
- movement in a transverse direction we mean in a direction substantially parallel to the axis of rotation of the cutting drum and thus along a length dimension.
- a second longitudinal dimension is a dimension measured substantially perpendicular to the axis of rotation of the cutting drum hereinafter referred to also as width or depth or thickness.
- the width or depth of a cut is therefore the dimension of a cut in the plane substantially perpendicular to the axis of rotation of the cutting drum.
- the width or thickness of a cut strand of tobacco is therefore the dimension of a cut strand measured in the plane substantially perpendicular to the axis of rotation of the cutting drum.
- a profile we mean the cutting edge on a knife blade and impinging on a material to be cut, a profile may also be the shape of the ground surface produced at a knife tip by the action of a grinder.
- discrete we mean a change, substantially a step change, in a parameter, for example, a dimension, a state or an operation condition.
- the cutting apparatus comprises a vibrating feeder 1, monitor 2 and two converging feed bands 3, 4 which compress and convey the incoming low density tobacco lamina through the mouth 5 towards the cutting drum 6.
- each feed band 3, 4 is in the form of a conveyor belt provided with compression weighting features.
- the feed bands 3, 4 form a jaw assembly of the mouth 5 and together define a plenum through which the tobacco lamina passes and is compressed.
- the cutting drum 6 is supported between bearings and is driven by a motor (not shown) such that the drum rotates at a speed between 200 and 600 rpm.
- the cutting drum 6 can be fitted with 8 or 10 knives 12 equally disposed around its circumference, although other numbers of knives 12 may be used.
- Fig 2 shows the cutting drum in more detail.
- the knives 12 are flat pieces of alloy steel approximately 1-1.5 mm thick, extending over the full width of the mouth 5.
- the cutting drum 6 is located adjacent the mouth 5, through which a compressed 'cheese' or 'cake' of tobacco is extruded against the rotating cutting drum 6.
- the cutting drum 6 is positioned such that the axis of rotation of the cutting drum 6 is substantially parallel to the mouth 5.
- the knives are fed outwards from a cutting drum by small amounts at frequent intervals.
- a grinder in the form of a rotating grindstone continually traverses across the width of the cutting drum, sharpening the knives and maintaining a sharp bevelled profile on the knives.
- the movement of the grindstone ensures that the radius of the knife tips from the mouth and from the centre of the cutting drum remains constant.
- the grindstone is fed radially, in other words in a radial direction, towards the axis of the cutting drum, and its contact position is kept constant by the action of a fixed diamond which 'dresses' the stone as it passes over it at one end of its stroke.
- the speed of conveyor belts or feed bands is controlled in a ratio to the speed of the drum so as to produce the required width of cut.
- the grinder takes the form of a grindstone wheel 7 mounted on an axis parallel to the axis of the cutting drum 6.
- the grindstone assembly is arranged so that it can be accurately positioned closer to, or further away from, the periphery or outer circumference of the cutting drum 6.
- the grindstone 7 is driven by a motor and can be rotated.
- the grindstone 7 and its motor are carried on a pivoted arm 15.
- the pivoted arm, and thus the grindstone and motor are raised or lowered by means of a geared stepper motor 16 and screw 17.
- the grindstone assembly is mounted on location apparatus for movement in the transverse direction, in a direction parallel to the axis of rotation of the cutting drum 6.
- the location apparatus is a traversing trolley 13 supported by linear bearings 14 so that it can move across the width of the cutting drum 6.
- the position of the grindstone 7 is determined by a leadscrew driven by a motor and provided with positioning apparatus such as a position encoder.
- the grinder is controlled as follows, with the motions as shown in Figure 4 .
- the grindstone 7 makes one or more traverses of the cutting drum 6, to establish the outer periphery of the knives 12.
- the grindstone 7 then makes one or more 'plunging' traverses, during which it is moved by a controlled distance towards the centre of the drum at predetermined positions across the traverse.
- These plunging movements in the radial direction may be abrupt, in which case a castellated effect is produced, or alternatively more gradual, in which case a wavy or undulating effect is produced.
- the depth of the plunge movement is equal to or greater than the width (or depth) of the cut dimension.
- the width (or depth) of the cut dimension In order to ensure that the individual strands will be fully cut through at the edges of the castellations or undulating shaped portions, and the strand lengths will be limited to the desired maximum. If the plunge movement in the radial direction is significantly less than the width (or depth) of the cut dimension then the strands may not be fully cut through at the edges of the castellations.
- the shape of the ground surface of the knife tip is shown in Figure 5 and Figure 6 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Tobacco Products (AREA)
Description
- The present invention relates to cutting apparatus and a method of cutting, particularly, but not exclusively to a cutting apparatus and method of cutting for cutting portions of a laminar product such as tobacco leaves.
- Tobacco leaves are processed for cigarette manufacture in a primary tobacco process. The laminate portions of the tobacco leaves are compressed and then cut in a cutting machine to create tobacco particles suitable for cigarette manufacturers. In a typical cutting process, the width of cut is between 0.7 and 1.0mm. The length of the tobacco strands produced is highly variable, ranging from less than 1 mm to more than 200mm. The maximum length of particle depends on the sizes of the lamina portions being cut, and these ultimately depend on the dimensions of the leaves from which they came.
- The presence of long particles in the cut tobacco was traditionally thought to be advantageous, and was considered to be an indicator of product quality. However, it has been shown that long particles detract from the free- flowing nature of the product, and cause problems of process non-uniformity at all stages up to and including cigarette manufacture. To overcome these problems, various ways of limiting the maximum length of strands of cut tobacco have been devised. One characteristic of this controlled strand length cut tobacco is that it is much more free-flowing than conventionally cut material. This means that the product is more easily blended with other types of tobacco blend component during processing, and that a greater degree of process uniformity is achieved in drying processes, and in the application of flavours to the tobacco. It is also found that the variation of cigarette weights produced by cigarette making machines is significantly reduced when processing controlled strand length product.
- An example of a technique limiting the maximum length of strands of cut tobacco by the use of castellated or ribbed knives is described in
WO85/104616 WO85/104616 -
GB 969601 -
GB 2143450 - It is desirable to produce tobacco strands cut to a limited maximum length using an inexpensive apparatus and a simple and inexpensive process.
- The present invention allows the maximum length of the strands of cut tobacco to be limited as described above, but by employing standard plain knives combined with a special mode of operation of the cutting machine knife grinding system.
- A disadvantage of the use of ribbed or castellated knives is that a large proportion of the knife material has to be removed by expensive and accurate machining operations during the manufacture of the knives. This results in a cost for these consumable items which is several times the cost of the equivalent standard knives.
- According to a first aspect, the present invention provides a cutting apparatus comprising the features of claim 1.
- By providing a cutting apparatus with a grinder operating with a combination of movements in the directions substantially parallel and substantially perpendicular to the axis of rotation of the cutting drum a controlled strand length cutting operation can be achieved with standard, non-profiled knife or knives. The knives used may be of a uniform thickness and do not need to be produced with an expensive machining operation. The overall cost of the apparatus is thus reduced and replacement parts more easily obtained. The, or each knife, may be configured to be to be fed in a direction away from the axis of rotation of the cutting drum and towards the cutting position at the mouth, with this arrangement the knives are moved towards the cutting position and can advantageously make repeatable, reliable cuts at the material to be cut. There may be a plurality of knives, for example a number of knives in the range from 8 to 10.
- The grinder may be configured to be rotated about an axis arranged substantially parallel to the axis of rotation of the cutting drum at the cutting position allowing the grinder ease of access to the knives to be ground and such that the cutting edge is arranged to lie on an imaginary cylindrical surface. The cutting apparatus may comprise a clamp assembly for compressing the material to be cut at the cutting position. By this arrangement the material to be cut can be presented at the cutting edge in an extruded and compressed manner and with a substantially uniform composition.
- One or more conveyor bands or conveyor belts may form the jaw assembly. The cutting apparatus comprises a control assembly configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum. The control assembly is configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum in a series of one or more discrete movements, such that the grinder moves in a substantially castellated motion.
- These configurations of cutting apparatus and control assembly are found to be particularly useful in providing the knives with a non-standard profile.
- Preferably, the control assembly is configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum and is configured to control the movement in a direction substantially parallel to the axis of rotation of the cutting drum, wherein the speed of movement the grinder in the direction substantially perpendicular to the axis or rotation of the cutting drum is faster than the speed of movement of the grinder in the direction substantially parallel to the axis of rotation of the cutting apparatus. This configuration is found to be particularly useful for grinding a knife with a castellated profile. The control assembly may comprise a pivoted arm and a geared stepper. The control assembly may adjust the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum in the range from 0.2mm to 2.5mm and is found to be particularly useful for cutting controlled length sections of a material.
- Advantageously, the cutting edges of the at least one knife may be arranged such that the cutting edges correspond to the mouth. It is preferable to provide the mouth parts with a profile corresponding to the profile of the knives, so that the minimum clearance between the knives and the mouth parts is maintained at all points across the cutting width.
- According to a second aspect, the present invention provides a method of manufacture of controlled strand length tobacco, configured with the aforementioned cutting apparatus. Also discloses is a method of manufacture for controlled strand length tobacco, comprising the steps of:
- delivering the tobacco material to be cut to a cutting position at a mouth defined by a jaw assembly;
- rotating a cutting drum having a cutting edge about an axis arranged substantially parallel to the mouth such that the cutting edge is arranged substantially perpendicular to the material to be cut; and
- bringing a grinder into contact with the cutting edge with a movement in a direction substantially parallel to the axis of rotation of the cutting drum and with a movement in a direction substantially perpendicular to the axis of rotation of the cutting drum, thereby grinding the cutting edge with a cutting profile.
- The step of moving the grinder may comprise the step of moving the grinder in a series of one or more discrete movements in a direction substantially parallel to the axis of rotation of the cutting drum and in a direction substantially perpendicular to the axis of rotation of the cutting drum, thereby grinding the cutting edge with a castellated profile.
- The step of moving the grinder may comprise the step of moving the grinder in a series of one or more gradual movements in a direction substantially parallel to the axis of rotation of the cutting drum and in a direction substantially perpendicular to the axis of rotation of the cutting drum, thereby grinding the cutting edge with an undulating profile.
- The method may comprise a step of compressing the extruded tobacco material at the jaw assembly.
- In the description of the preferred embodiment of the invention the following terms are used and are set out below.
- A first longitudinal dimension and a second longitudinal dimension are described. A first longitudinal dimension is a dimension measured substantially along the axis of rotation of the cutting drum and hereinafter referred to also as length (of, for example, cut strands) and width (of, for example, cutting drum). The length of the cut strands of tobacco is therefore a measurement of the dimension of the strand substantially in the direction of the axis of rotation of the cutting drum. The width of the cutting drum is therefore a measurement of the dimension of the cutting drum substantially in the direction parallel to its axis of rotation, and the width of the mouth is therefore a measurement of the dimension of the mouth opening in a direction substantially parallel to the axis of rotation of the cutting drum.
- By movement in a transverse direction we mean in a direction substantially parallel to the axis of rotation of the cutting drum and thus along a length dimension.
- A second longitudinal dimension is a dimension measured substantially perpendicular to the axis of rotation of the cutting drum hereinafter referred to also as width or depth or thickness. The width or depth of a cut is therefore the dimension of a cut in the plane substantially perpendicular to the axis of rotation of the cutting drum. The width or thickness of a cut strand of tobacco is therefore the dimension of a cut strand measured in the plane substantially perpendicular to the axis of rotation of the cutting drum.
- By movement in a radial direction we mean in a direction substantially perpendicular to the axis of rotation of the cutting drum. By profile we mean the cutting edge on a knife blade and impinging on a material to be cut, a profile may also be the shape of the ground surface produced at a knife tip by the action of a grinder. By discrete we mean a change, substantially a step change, in a parameter, for example, a dimension, a state or an operation condition.
- The present invention will now be described in more detail, by way of example only, with reference to the accompanying drawings, in which:
-
Figure 1 is a cross sectional view of a tobacco cutter of a conventional design suitable for adaptation to form the cutting apparatus of the present invention; -
Figure 2 is a side view of the cutting drum of the tobacco cutter ofFigure 1 , in further detail; -
Figure 3 is a side view of a portion of the cutting apparatus of the present invention; -
Figure 4 is a schematic view of the cutting apparatus of the present invention showing a range of movement the grinder; -
Figure 5 is a schematic view of the shape of the knife tip produced by the present invention; and -
Figure 6 is a side view of the knife tip ofFigure 5 . - A type of typical conventional tobacco cutter and the cutter adapted to form the cutting apparatus of the present invention will now be described with reference to the apparatus of
Figure 1 and Figure 2 . The cutting apparatus comprises a vibrating feeder 1, monitor 2 and two convergingfeed bands 3, 4 which compress and convey the incoming low density tobacco lamina through the mouth 5 towards the cuttingdrum 6. In the preferred embodiment eachfeed band 3, 4 is in the form of a conveyor belt provided with compression weighting features. Thefeed bands 3, 4 form a jaw assembly of the mouth 5 and together define a plenum through which the tobacco lamina passes and is compressed. - The cutting
drum 6 is supported between bearings and is driven by a motor (not shown) such that the drum rotates at a speed between 200 and 600 rpm. - The cutting
drum 6 can be fitted with 8 or 10knives 12 equally disposed around its circumference, although other numbers ofknives 12 may be used.Fig 2 shows the cutting drum in more detail. In the preferred embodiment theknives 12 are flat pieces of alloy steel approximately 1-1.5 mm thick, extending over the full width of the mouth 5. The cuttingdrum 6 is located adjacent the mouth 5, through which a compressed 'cheese' or 'cake' of tobacco is extruded against the rotating cuttingdrum 6. The cuttingdrum 6 is positioned such that the axis of rotation of the cuttingdrum 6 is substantially parallel to the mouth 5. The action of thesharp knives 12 passing from top to bottom, from a location above thefeed band 4 to a location below the feed band 3, of the extruded 'cheese' of material to be cut results in strands of tobacco being cut whose thickness is a function of the speed of extrusion relative to the rotational speed of the cuttingdrum 6. - In a conventional arrangement of a tobacco cutter, the knives are fed outwards from a cutting drum by small amounts at frequent intervals. A grinder in the form of a rotating grindstone continually traverses across the width of the cutting drum, sharpening the knives and maintaining a sharp bevelled profile on the knives. The movement of the grindstone ensures that the radius of the knife tips from the mouth and from the centre of the cutting drum remains constant. After a small number of traverses, the grindstone is fed radially, in other words in a radial direction, towards the axis of the cutting drum, and its contact position is kept constant by the action of a fixed diamond which 'dresses' the stone as it passes over it at one end of its stroke. The speed of conveyor belts or feed bands is controlled in a ratio to the speed of the drum so as to produce the required width of cut.
- The improvement to the operation of the conventional tobacco cutter of the present invention will now be described with reference to
Figures 1 and3 . In the preferred embodiment of the invention, the grinder takes the form of agrindstone wheel 7 mounted on an axis parallel to the axis of the cuttingdrum 6. The grindstone assembly is arranged so that it can be accurately positioned closer to, or further away from, the periphery or outer circumference of the cuttingdrum 6. Thegrindstone 7 is driven by a motor and can be rotated. Thegrindstone 7 and its motor are carried on a pivotedarm 15. The pivoted arm, and thus the grindstone and motor are raised or lowered by means of a gearedstepper motor 16 andscrew 17. The grindstone assembly is mounted on location apparatus for movement in the transverse direction, in a direction parallel to the axis of rotation of the cuttingdrum 6. In the preferred embodiment the location apparatus is a traversingtrolley 13 supported bylinear bearings 14 so that it can move across the width of the cuttingdrum 6. The position of thegrindstone 7 is determined by a leadscrew driven by a motor and provided with positioning apparatus such as a position encoder. - In order to achieve the desired castellated knife profile, the grinder is controlled as follows, with the motions as shown in
Figure 4 . - The
grindstone 7 makes one or more traverses of the cuttingdrum 6, to establish the outer periphery of theknives 12. - The
grindstone 7 then makes one or more 'plunging' traverses, during which it is moved by a controlled distance towards the centre of the drum at predetermined positions across the traverse. These plunging movements in the radial direction may be abrupt, in which case a castellated effect is produced, or alternatively more gradual, in which case a wavy or undulating effect is produced. - In the preferred embodiment, the depth of the plunge movement is equal to or greater than the width (or depth) of the cut dimension. In order to ensure that the individual strands will be fully cut through at the edges of the castellations or undulating shaped portions, and the strand lengths will be limited to the desired maximum. If the plunge movement in the radial direction is significantly less than the width (or depth) of the cut dimension then the strands may not be fully cut through at the edges of the castellations. The shape of the ground surface of the knife tip is shown in
Figure 5 and Figure 6 . - Various modifications may be made to the described embodiment without departing from the scope of the present invention. There may be a different number of knives and grinders. There may be more than one cutting drum and more than one apparatus for delivery of the material to be cut, for example there could be more than one conveyor or compressing line. In an alternative embodiment the orientation of the axis of rotation or the configuration of the grinding wheel could be set at an angle or along a different axis to that of the cutting drum. In addition other speeds of rotation of the cutting drum and the grinder wheel can be envisaged.
Claims (11)
- A cutting apparatus comprising,
a mouth (5) defined by a jaw assembly (3,4) for delivering the material to be cut to a cutting position at the mouth;
a cutting drum (6) having;
at least one knife (12) the, or each, knife having a cutting edge,
the cutting drum (6) having drive means therefor and being rotatable about an axis arranged substantially parallel to the mouth such that the cutting edge of the at least one knife is arranged substantially perpendicular to the material to be cut; and
a cylindrical grinder (7) for removing material from the cutting edge of the at least one knife,
the cutting apparatus further comprising a control assembly for controlling the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum,
wherein the grinder is configured to be brought into contact with the cutting edge with a movement in a direction substantially parallel to the axis of rotation of the cutting drum, and
characterised in that the grinder, under the control of the control assembly, is configured to be brought into contact with the cutting edge in a direction substantially perpendicular to the axis of rotation of the cutting drum in a series of discrete, abrupt and plunging movements in a substantially castellated motion to produce a castellated profile. - A cutting apparatus as claimed in Claim 1, wherein the knives are configured to be fed in a direction away from the axis of rotation of the cutting drum and towards the cutting position at the mouth.
- A cutting apparatus as claimed in Claim 1 or Claim 2, wherein the grinder is configured to be rotated about an axis arranged substantially parallel to the axis of rotation of the cutting drum.
- A cutting apparatus as claimed in any one of Claim 1, Claim 2 or Claim 3, wherein material is removed from the or each knife such that the cutting surface is ground and the cutting edge is arranged to lie on an imaginary cylindrical surface.
- A cutting apparatus as claimed in any of Claims 1 to 4, further comprising a clamp assembly for compressing the material to be cut at the cutting position.
- A cutting apparatus as claimed in any of Claims 1 to 5, wherein the jaw assembly comprises at least two conveyor bands.
- A cutting apparatus as claimed in any preceding claim, wherein the control assembly is configured to control the movement of the grinder in a direction substantially perpendicular to the axis of rotation of the cutting drum and is configured to control the movement in a direction substantially parallel to the axis of rotation of the cutting drum, wherein the speed of movement of the grinder in the direction substantially perpendicular to the axis of rotation of the cutting drum is faster than the speed of movement of the grinder in the direction substantially parallel to the axis of rotation of the cutting drum.
- A cutting apparatus as claimed in Claim 7, wherein the control assembly comprises a pivoted arm (15) and a geared stepper motor (16).
- A cutting apparatus as claimed in Claim 7 or claim 8, wherein the control assembly is configured to adjust movement in a direction substantially perpendicular to the axis of rotation of the cutting drum in the range from 0.2mm to 2.5mm.
- A cutting apparatus as claimed in any of Claims 1 to 9, wherein the cutting edges of the at least one knife are arranged such that the cutting edges correspond to the mouth.
- A method of manufacture for controlled strand length tobacco, wherein the method comprises using the cutting apparatus of any preceding claim.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL09785600T PL2346363T3 (en) | 2008-09-09 | 2009-09-09 | Cutting apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0816491A GB0816491D0 (en) | 2008-09-09 | 2008-09-09 | Controlled strand length cutting of tobacco using uniform thickness knives |
PCT/GB2009/051144 WO2010029348A2 (en) | 2008-09-09 | 2009-09-09 | Cutting apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2346363A2 EP2346363A2 (en) | 2011-07-27 |
EP2346363B1 true EP2346363B1 (en) | 2018-02-28 |
Family
ID=39889072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09785600.9A Active EP2346363B1 (en) | 2008-09-09 | 2009-09-09 | Cutting apparatus |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2346363B1 (en) |
JP (1) | JP5801198B2 (en) |
CN (1) | CN102196735B (en) |
GB (1) | GB0816491D0 (en) |
HU (1) | HUE037314T2 (en) |
PL (1) | PL2346363T3 (en) |
WO (1) | WO2010029348A2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2473884A (en) * | 2009-09-29 | 2011-03-30 | Dickinson Legg Ltd | Cutting apparatus with knife grinder |
PL216509B1 (en) | 2010-11-03 | 2014-04-30 | Int Tobacco Machinery Poland | Retractable blade mounted on the drum of the tobacco cutter |
PL392927A1 (en) | 2010-11-10 | 2012-05-21 | International Tobacco Machinery Poland Spółka Z Ograniczoną Odpowiedzialnością | Method for preparing the pop knife mounted on a drum of the tobacco cutter for cutting tobacco fibers of defined length and the knife prepared using this method |
DE102017116778A1 (en) * | 2017-07-25 | 2019-01-31 | Hauni Maschinenbau Gmbh | Method for producing cut tobacco |
KR102102381B1 (en) * | 2018-05-31 | 2020-04-20 | (주)네스코바이오 | Re-grinding Apparatus for Cutter of Knife Roller |
KR102299248B1 (en) * | 2019-03-26 | 2021-09-07 | (주)네스코바이오 | Manufacturing Apparatus and Manufacturing Method for Cutter of Knife Roller |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB711446A (en) * | 1952-05-14 | 1954-06-30 | Kurt Koerber | Improvements in tobacco cutting machines |
DE1197795B (en) * | 1959-01-21 | 1965-07-29 | Amf Sasib Soc P Az Scipione In | Tobacco cutting machine |
GB969601A (en) * | 1959-09-25 | 1964-09-09 | George Smith | Improvements in or relating to tobacco-cutting machines |
JPS561176Y2 (en) * | 1976-09-17 | 1981-01-12 | ||
JPS5828265A (en) * | 1981-07-23 | 1983-02-19 | エイエムエフ・インコ−ポレ−テツド | Method and apparatus for cutting laminate material |
DE3344678A1 (en) * | 1982-12-23 | 1984-06-28 | Hauni-Werke Körber & Co KG, 2050 Hamburg | Tobacco cutter knife |
DE3403543A1 (en) * | 1983-07-16 | 1985-01-24 | Hauni-Werke Körber & Co KG, 2050 Hamburg | METHOD AND DEVICE FOR GRINDING A WAVE-SHAPED CUTTING PROFILE FOR CUTTING TOBACCO |
US4718198A (en) * | 1984-02-02 | 1988-01-12 | Hauni-Werke Korber & Co. Kg. | Apparatus for grinding cutting edges of knives in tobacco cutting machines |
IT1184339B (en) * | 1984-03-14 | 1987-10-28 | Hauni Werke Koerber & Co Kg | DEVICE FOR SHARPENING THE ROTARY KNIVES OF A TOBACCO CUTTER |
GB8409157D0 (en) * | 1984-04-09 | 1984-05-16 | Amf Inc | Knives in cutting machines |
DE10021614A1 (en) * | 2000-05-04 | 2001-11-08 | Hauni Maschinenbau Ag | Method and device for automatic regrinding of tobacco cutting knives |
GB0305607D0 (en) * | 2003-03-12 | 2003-04-16 | Garbuio Ltd | Tobacco cutting apparatus |
-
2008
- 2008-09-09 GB GB0816491A patent/GB0816491D0/en not_active Ceased
-
2009
- 2009-09-09 CN CN200980142145.2A patent/CN102196735B/en active Active
- 2009-09-09 PL PL09785600T patent/PL2346363T3/en unknown
- 2009-09-09 EP EP09785600.9A patent/EP2346363B1/en active Active
- 2009-09-09 JP JP2011525631A patent/JP5801198B2/en active Active
- 2009-09-09 WO PCT/GB2009/051144 patent/WO2010029348A2/en active Application Filing
- 2009-09-09 HU HUE09785600A patent/HUE037314T2/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP2346363A2 (en) | 2011-07-27 |
WO2010029348A3 (en) | 2010-07-15 |
CN102196735B (en) | 2015-04-01 |
GB0816491D0 (en) | 2008-10-15 |
JP5801198B2 (en) | 2015-10-28 |
JP2012501640A (en) | 2012-01-26 |
PL2346363T3 (en) | 2018-08-31 |
WO2010029348A2 (en) | 2010-03-18 |
CN102196735A (en) | 2011-09-21 |
HUE037314T2 (en) | 2018-08-28 |
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