Imported: 13 Feb '17 | Published: 11 Oct '16
USPTO - Utility Patents
An apparatus for inserting or otherwise introducing objects such as fluid-containing capsules into filter rod material during filter rod manufacture comprises an object store and an object transfer mechanism having one or more reciprocating transfer units configured to receive objects from the object store and to output objects in ordered sequence.
This application is a National Stage Entry entitled to and hereby claims priority under 35 U.S.C. §§365 and 371 to corresponding PCT Application No. PCT/EP2010/052974, filed Mar. 9, 2010, which in turn claims priority to South African Application Serial No. ZA 2009/01679, filed Mar. 9, 2009. The entire contents of the aforementioned applications are herein expressly incorporated by reference.
This invention relates to an apparatus for introducing objects such as fluid-containing capsules into filter rod material during manufacture of smoking article filter rods.
It is known to provide a frangible capsule containing a flavourant, for example menthol, inside the filter of a smoking article such as a cigarette. By applying pressure to the outside of the filter, the smoker may break the capsule therein and release the flavourant. Thus, a smoker wishing to add flavour to the inhaled gaseous flow from the cigarette may do so by simply squeezing the filter.
In known filter rod making machines, capsules are incorporated into cigarette filter rods by supplying capsules from a capsule reservoir into the pockets of a delivery wheel which rotates and guides the capsules into a flow of filter tow. The tow containing the capsules is subsequently shaped into a rod, paper wrapped and cut into segments to form individual capsule-containing rod segments.
The present invention provides an alternative approach for inserting objects such as frangible capsules into filter rods.
The present invention provides an apparatus for introducing objects into filter rod material during filter rod manufacture, comprising an object store and an object transfer mechanism having one or more reciprocating transfer units configured to receive objects from the object store and to output objects in ordered sequence.
The apparatus may be in combination with a filter rod manufacturing machine configured to manufacture filter rods from the filter rod material. The one or more reciprocating transfer units may be configured to output objects in an ordered sequence such that each filter rod has a desired arrangement of one or more objects longitudinally disposed therein.
The object transfer mechanism may comprise, for example, two or four reciprocating transfer units configured to receive objects from the output store and to output objects in ordered sequence.
The apparatus may further comprise a combining member configured to combine the objects output by the transfer units and to output a combined sequence of objects for introduction into the filter rod material.
The apparatus may further comprise an object propulsion mechanism configured to propel objects from the object transfer mechanism such that the objects are introduced into the filter rod material.
A reciprocating transfer unit may receive objects in a first position and in a second position and may be configured such that objects received in the first position are output from the transfer unit when the transfer unit is in the second position; and such that objects received in the second position are output from the transfer unit when the transfer unit is in the first position.
The invention also provides a method for introducing objects into filter rod material during filter rod manufacture, comprising: receiving objects at one or more reciprocating transfer members, from an object store; and outputting objects from the one or more reciprocating transfer member in ordered sequence.
FIG. 1 shows part of a filter rod making machine 1. During operation of machine 1, filter rod material in the form of cellulose acetate tow is drawn from a source of tow (not shown) through a set of conveying rollers (not shown), and is compressed through stuffer jet 3 and through the tongue 4 of a garniture 5, where it is paper wrapped with a plugwrap (not shown) and subsequently cut into segments by a cutter (not shown) to form filter rods.
As shown in FIG. 1, filter rod making machine 1 includes a capsule insert mechanism 6 for inserting one or more frangible, fluid-containing capsules into each eventual filter rod produced by the machine 1.
Referring to FIGS. 2 and 2a, capsule insert mechanism 6 is connectable via tubing 7 to a capsule reservoir in the form of a feed unit 8 having a rotatable dish 9. Prior to, or during operation of the machine 1, capsules are loaded into the dish 9. In use, the dish 9 is rotated by a motor. Thus, centrifugal forces are exerted on the capsules which urges them towards the outer edge of dish 9, where they are received into and through the tubing 7 and into the insert mechanism 6.
FIGS. 3, 3a, 3b and 4 show the insert mechanism 6 in more detail. As shown insert mechanism 6 comprises a temporary object store in the form of a hopper 10, a combining member in the form of a manifold assembly 11, a capsule propulsion mechanism 12 and a capsule transfer mechanism comprising four transfer members in the form of reciprocating rods 13 which are driven by a rod driving mechanism 14.
In use, capsules are fed from feed unit 8 into vertical channels 15 in the hopper 10, where they are temporarily stored until being successively received into recesses in the reciprocating rods 13 and transported by the movement of the rods towards the manifold assembly 11.
The capsules are then successively propelled by capsule propulsion mechanism 12 from the rods 13 into manifold assembly 11, where they are combined into a single output tube. The capsules then pass through a tube entering a hole 4a in the tongue 4 of the garniture 5 and into the moving tow. The capsules are then carried by the tow through the garniture and in this way are incorporated into the eventual filter rods.
The capsules are output from the reciprocating rods in an ordered sequence, for example one by one at fixed intervals. In this way, the capsules are introduced into the tow in a controlled manner so that a desired number of capsules are inserted into each filter rod produced by the machine 1. For example, the rate of introduction of capsules into the tow may be such that 1, 2 or 4 capsules are inserted into each filter rod.
FIG. 5 shows the feed unit 8 in more detail. As shown, the feed unit 8 is supported by legs 17 and feet 18 and has a rim 19. Feed unit 8 includes a motor 20, for example a 40 W, 135 RPM motor, which is coupled to the dish 9 by a shaft, and a gearing mechanism (not shown) configured to rotate the dish 9 so that the capsules are centrifugally urged towards the rim 19. As shown, the rim 19 has four openings 21 around its inner perimeter which receive capsules from the rotating capsule pool in the dish 9. The openings 21 lead to four arcuate grooves 22 which guide the capsules into the tubing 7, where they fall under gravity into the hopper 10.
Preferably, the machine 1 includes a load unit (not shown) mounted on top of the dish 9, for automatically loading capsules into the feed unit 8. The load unit comprises a capsule-containing area and a capsule detection mechanism having a photosensor for optically detecting whether the feed unit is loaded to capacity or not. The load unit is configured to load capsules from the capsule-containing area to the dish 9 if the dish 9 is not loaded to capacity. If the dish is loaded to capacity, the load unit does not load capsules into the dish. Thus, the load unit is configured such that the dish 9 is kept filled with capsules, but not overloaded. In this way, as capsules leave the dish 9 and pass into the tubing, further capsules are added to the dish 9 by the load unit so that the amount of capsules in the dish 9 is kept at a desired level.
Alternatively, however, prior to, or during operation of the machine 1, capsules may be manually loaded into the dish 9.
FIGS. 6 and 7 show the hopper 10 in more detail. As shown, the hopper 10 has a back plate 23, a covering plate 24 having a supporting lip 25, a connector plate 26 and four ports, in the form of quick connectors 27, configured to receive the four tubes of the tubing 7. Referring to FIG. 7, quick connectors 27 are threaded into threaded holes in the connector plate 26 and the plates 23, 24, 26 are coupled together with thumb screws 28.
As shown in FIG. 7, back plate 23 has four grooves 29 extending longitudinally from top to bottom thereof and aligned with the threaded holes in the connector plate. The supporting lip 25 has four vertical cylindrical holes (not shown) aligned with the grooves 29. Thus, the quick connectors 27, the holes in the connector plate 26, the grooves 29 and the holes (not shown) in the supporting lip 25 are aligned and define the four channels 15 running longitudinally through the hopper 10.
Although the hopper 10 is described above as being connectable via tubing to a capsule reservoir in the form of a single feed unit 8, alternatively the capsule reservoir may comprise 2, 3, or 4 storage units such as the feed unit 8. That is, the hopper 10 may be connected to a plurality of separate feed units. For example, two of the quick connectors may be connected to a first feed unit and the other two quick connectors may be connected to a second feed unit. The first and second feed units may each have two openings, rather than the four openings 21 of the feed unit 8, each opening leading to a single tube which delivers capsules under gravity to one of the quick connectors 27 of the hopper 10. The first and second feed units may be loaded with capsules containing different fluids, for example different flavourants such as menthol, spearment or orange essence. Similarly, the hopper 10 may alternatively be connected to four separate feed units, each for instance containing a respective type of capsule.
FIGS. 8 to 11 shows the capsule transfer mechanism in more detail. As shown in FIG. 8, the capsule transfer mechanism comprises a housing 30 in which the reciprocating rods 13 are movably housed. The transfer mechanism further comprises a rod driving mechanism 14 configured to provide reciprocating horizontal motion to the rods 13 relative to the fixed housing 30.
Referring to FIGS. 8 and 9, rod driving mechanism 14 comprises four eccentric mechanisms 31, each eccentric mechanism being coupled to an axle 32 which in use is rotated by a motor 33. As shown, each eccentric mechanism has a circular collar 34 attached to a protruding part 35 which in turn is attached to a rod 13. In this way, the rod driving mechanism is configured such that rotation of the axle 32 by the motor 33 imparts reciprocating motion to the rods 13. Thus, the rate of rotation of the axle 32 controls the rate at which the rods 13 move back and forth.
Referring to FIGS. 9, 10 and 11 the reciprocating rods 13 have cut-away sections which define vertically aligned flat regions 13a, 13b on either side of each rod. As shown, a recess in the form of a vertical cylindrical hole 37 is formed from the upper flat region 13a to the lower flat region 13b of each rod 13.
Preferably the hole 37 is dimensioned so as to have capacity for only one capsule at any one time. However, the hole 37 may be dimensioned so as to have capacity for two, three or more capsules at any one time.
As shown, an air channel 38 in the form of further vertical cylindrical hole is formed through the cylindrical end part 13c of each rod 13. The air channel 38 forms part of the capsule propulsion mechanism described in more detail below.
As shown in FIGS. 8 to 10 the housing 30 has front and rear body parts 30a, 30b and top and bottom inserts 39a, 39b. The front and rear body parts 30a, 30b have cylindrical holes therethrough to slidably accommodate the front and end parts of the rods 13. As shown in FIGS. 10 and 11, in use the rods 13 move horizontally back and forth within the housing 30 and the flat regions 13a, 13b of the reciprocating rods 13 slide between the flat interior surfaces 40a, 40b of the inserts 39a, 39b.
As shown in FIG. 8-10, the top insert 39a has four vertical cylindrical holes 41 arranged to receive capsules from the channels 15 of the hopper 10. The lower insert 39b has four vertical cylindrical holes 42, offset from the holes 41 along the direction of the rods 13 and arranged to receive capsules from the rods 13.
The action of one of the reciprocating rods 13 will now be described. FIGS. 10 and 11 show cross sectional views of the insert mechanism 6. As shown, a column of capsules 43, one on top of the other, is contained in channel 15 of hopper 10. In FIG. 10, rod 13 is positioned in a load position in which the hole 37 in the rod 13 is aligned with a hole 41 in the upper insert 39a. Thus as shown, a capsule 43 from the capsule column falls under gravity into the hole 37 and onto the surface 40b of the lower insert 39b. This causes the column of capsules 43 in the hopper 10 to move vertically downwards and makes a space at the top of the column for a further capsule to be received from the feed unit 8.
The rod 13 then moves away from the load position and thus transports the capsule in the hole 37 along the interior surface 40b of the bottom insert 39b until the rod 13 reaches the eject position shown in FIG. 11. As shown, in the eject position, hole 37 is aligned with a hole 42 in the bottom insert 39b. In this position, an airjet from capsule propulsion mechanism 12 propels the capsule 42 from the hole 37 through the hole 42 and into the manifold assembly 11. Once the capsule has been ejected, the driving mechanism moves the rod 13 back into the load position shown in FIG. 10 to receive the next capsule 43 from the column of capsules 43. The rod driving mechanism 14 is configured such that a full rotation of the axle 32 causes the rod 13 to move through the load and eject positions shown in FIGS. 10 and 11 respectively.
The foregoing description referred to the passage of capsules through one channel 15 of the hopper 10, into a recess in one of the rods 13 and into the manifold assembly 11. The same process applies in the same way to the other channels and rods shown in FIGS. 1-9.
The capsule propulsion mechanism 12 will now be described in more detail. As shown in FIGS. 8 to 11, capsule propulsion mechanism 12 comprises four quick connectors 43 for connection with cylinders of compressed air (not shown) and a series of air channels 38, 44. Air channels 44 are formed in the front and rear body parts 30a, 30b and the top insert 39a of the housing 30. Air channel 38 formed in the end part 13c of each rod 13. The air channels 38, 44 are configured such that when a rod is in the eject position, the air path from the corresponding quick connector 43 to the manifold assembly 11 is completed, thereby providing a pulse of air to blow the capsule into the output manifold 11.
Referring to FIG. 10, when rod 13 is the load position, the air path from quick connector 43 to the output manifold 11 is blocked by the rod 13. As shown, the air path is blocked by the end part 13c of rod 13 and is further blocked by the flat region of rod 13. Thus, in the load position no air is drawn from the air cylinder attached to quick connector 43. However, as shown in FIG. 11, when rod 13 is in the eject position, air from the cylinder may flow through channels 44, via channel 38 in rod 13 and through hole 37 in the rod and into the output manifold 11. Thus, a jet of air is drawn from the air cylinder. In this way, air pulses drawn from the air cylinders are automatically synchronised with the motion of the reciprocating rods. That is, when each rod moves into the eject position, a pulse of air is automatically supplied from the corresponding cylinder. However, when the rod is away from the load position, no air is supplied. Thus, compressed air is only supplied when it is needed.
It will be understood by those skilled in the art that the downward force of gravity may assist in transferring capsules into the output manifold 11 in addition to the action of the capsule propulsion mechanism 12. Alternatively, no propulsion mechanism may be employed and the capsules may drop into the output manifold 11 through the action of gravity alone.
Furthermore, propulsion means other than air may be used to propel the capsule into the outlet. Examples can include (but are not limited to) any compressed gas or liquid.
The rod driving mechanism 14 is configured such that the motion of the rods 13 is staggered relative to one another. Thus, only one of the rods 13 receives a capsule at any one time. In addition, the output manifold 11 receives a capsule from only one of the rods 13 at any one time.
Thus, receiving capsules into the rods comprises: receiving a first capsule into a first of the rods, then receiving a second capsule into a second of the rods, then receiving a third capsule into a third of the rods; then receiving a fourth capsule into a fourth of the rods.
Further, receiving capsules into the output manifold comprises: receiving a first capsule from a first of the rods, then receiving a second capsule from a second of the rods, then receiving a third capsule from a third of the rods; then receiving a fourth capsules from a fourth of the rods.
The coordination of the movement of the respective reciprocating rods ensures that capsules are ejected one at a time from each of the rods 13 into the output manifold 11 and thus one at a time into the tow. The configuration is beneficial as it allows for a high rate of capsule transfer, by virtue of the use of more than one transfer unit, and thus a short separation between the capsules in the eventual rod, whilst ensuring that there is a free flow of capsules into and through the output manifold.
FIG. 12 shows a sectional view of output manifold 11. As shown, output manifold assembly 11 comprises four capsule receiving tubes 45, one for each transfer unit. The tubes 45 may be formed by channels formed in the body of the output manifold 11, or may alternatively be, for example, plastic or rubber tubing housed inside the manifold 11. Each capsule receiving tube is arranged to receive capsules from only one of the rods 13. As shown, output manifold assembly further comprises two intermediate tubes 46 and an output tube 47. Each intermediate tube 46 is connected to two of the capsule receiving tubes 45 and to the output tube 47. Thus, capsules blown into the capsule receiving tube 45 are guided into the intermediate tube 46 and into the output tube 47. As shown in FIGS. 4 and 4a, the tubing 45, 46 and part of the output tube 47 is housed in a housing 48.
Preferably, one or more tubes (45, 46, 47) directly connect an output of a said reciprocating transfer unit to a point of insertion into the filter rod material. Tubes from an output of each transfer unit merge such that all capsules are output to the single point of insertion.
Preferably, the object store is configured to transfer objects to a reciprocating transfer unit in a direction transverse, i.e. having a component perpendicular, to an axis along which the reciprocating transfer unit reciprocates. Alternatively, or in addition, the apparatus is configured to output objects from a reciprocating transfer unit in a direction transverse, i.e. having a component perpendicular, to an axis along which the reciprocating transfer unit reciprocates. Preferably, the input and/or output directions are substantially perpendicular to the axis along which the reciprocating transfer unit reciprocates.
Preferably, the object propulsion mechanism (12) comprises a first port on a first side of the reciprocating transfer unit and a second port (42) on a second side of the reciprocating transfer unit. The second port is opposite the first port. The first and second ports are aligned with an object in a second, eject, position of the transfer unit. The object proportion mechanism is configured to propel fluid (e.g. air) through the first and second ports and the reciprocating transfer unit to propel the object.
Preferably, a hole (37) in the transfer unit inhibits movement of the object within the reciprocating transfer unit in both directions along an axis on which the reciprocating transfer unit is configured to reciprocate.
Referring to FIGS. 12 and 13, tongue 4 has a hole 4a for receiving capsules from the manifold assembly 11. As shown in FIG. 12, tongue 4 further comprises a curved guiding tube 50, which receives capsules from the output tube 47 and guides them into the center of the tow path.
Preferably the filter making machine manufactures “double length” filter rods suitable for manufacturing two cigarettes. As is well known in the art, in cigarette manufacture using such filter rods, each filter rod is longitudinally aligned with a pair of tobacco rods, wrapped with a tipping paper to join the rods to the filter and subsequently cut, thereby forming two cigarettes.
However, alternatively the filter rods manufactured by the machine may have any other length and may for example be “single length” filter rods suitable for attachment to a single tobacco rod with a tipping paper to form a cigarette. Alternatively, the filter rods may be triple or quadruple length filter rods. Alternatively, the filter rods manufactured by the filter making machine may be filter segments intended to form part of a multi-segment filter. Alternatively, the filter rods may be cut to form rod segments for use as part of multi-segment filters.
This machine 1 may be used to deliver capsules comprising two or more varieties of capsule from two or more separate feed units, e.g. one capsule variety containing menthol and one capsule variety containing spearmint or another flavourant such as orange essence. For example, a first variety of capsules may be loaded into a first feed unit connected by tubing to the insert mechanism 6 and a second variety of capsules may be loaded into a second feed unit, also connected by tubing to the insert unit 6. The reciprocating rods may be configured to alternately output capsules of the first and second varieties. The alternate output of the reciprocating rods may then be combined in the output manifold 11 so that capsules of the first and second varieties are alternately delivered into the tow and so that each eventual rod contains one capsule of the first variety and one capsule of the second variety, for example.
It will be apparent to those skilled in the art that variations of the insert mechanism 6 could insert any number of capsule varieties into the tow in any desired sequence. In this way, those skilled in the art will appreciate that variations of the filter rod machine 1 could be used to obtain filter rods containing any number of the same or different capsule varieties arranged in any desired sequence.
Furthermore, those skilled in the art will appreciate that the output sequence of the reciprocating rods may be tailored so that capsules are delivered into the tow with any desired period between successive capsule deliveries and that the delivery period may be the same or different between pairs of successive capsules.
For example, as described above receiving capsules into the output manifold may comprise: receiving a first capsule from a first of the rods, then receiving a second capsule from a second of the rods, then receiving a third capsule from a third of the rods; then receiving a fourth capsules from a fourth of the rods. The rod driving mechanism 6 of the machine 1 could be configured so that there is a short delivery period between the delivery of the first capsule and the second, subsequent capsule and a longer delivery period between the delivery of the third capsule and the fourth capsule.
In this way, those skilled in the art will appreciate that variations of the filter rod machine 1 could be used to obtain filter rods in which the neighbouring capsules in the rod are separated by any desired separation, and that this separation may be the same or different for different neighbouring capsule pairs.
Each filter rod made by the machine 1 is preferably generally identical. However, those skilled in the art will appreciate that the machine 1 may alternatively make filter rods of different varieties in a desired sequence. For example, a filter containing two capsules of one variety and a filter containing two capsules of another variety may be alternately manufactured.
FIGS. 14-17 shows another capsule insert unit 51, which is another variation of the capsule insert unit 6. As shown in FIG. 14, insert unit 51 comprises a frame 52 having a feed unit 53 mounted thereon. The insert unit further comprises a hopper 54, a combining member in the form of a manifold assembly 55, a capsule propulsion mechanism 56 and a capsule transfer mechanism comprising two transfer members in the form of two reciprocating rods 57 which are driven by a rod driving mechanism 58.
The feed unit 53 operates in substantially the same way as the feed unit 8 and differs in that the rim has two opening rather than the four opening 21 of the feed unit 8. Feed unit 53 feeds the hopper 54 through a pair of tubes 53a.
The hopper 54 is similar to the hopper 10 of the insert mechanism 6. However, the hopper 54 has only two channels rather than four. The channels receives capsules from the tubing 53a and in use, a column of capsules, one on top of the other is formed in each channel.
The transfer mechanism of the insert unit 51 operates in a similar manner to the transfer mechanism of the insert unit 6. However, the insert unit 51 has two reciprocating rods 57 rather than four. The reciprocating rods 57 operate in a similar manner to the rods 13. In use, reciprocating rods 57 alternately receive capsules into recesses therein and transfer the capsules towards the manifold assembly 55. Manifold assembly 55 has a Y-shaped tube 55a which alternately receives capsules from the rods 57. The Y-shaped tube 55a has first and second capsule receiving tubes in the form of first and second branches 55b, one for each transfer unit. As shown, each branch 55b is connected to an output tube part 55c, thus defining the “Y” shape. In use, capsules received into one or the other of the branches 55a, 55b are combined into a single stream in the output tube part 55c and subsequently guided into the flow of tow.
Although the capsules are described above as being delivered into the tongue 4 of the garniture 5, the capsules could alternatively be delivered into the tow in another way. For example, the output tube 55c may be inserted into the stuffer jet 3, as shown in FIG. 18. As shown in FIG. 18, the capsules are fed into the stuffer jet together with two bands of tow drawn via a set of rollers. Preferably, the output tube extends through the stuffer jet and into the tow inlet of the garniture tongue. The capsules are thus brought into contact with the tow in the tongue and are subsequently carried by the tow through the garniture so as to be incorporated into the eventual filter rods.
FIGS. 19A-D illustrates a further variation of the capsule insert units 6, 51. As shown, the reciprocating rod 59 of FIGS. 8A-D differs from the reciprocating rod 13, 57 in that the rod 59 comprises two capsule-containing recesses 60a, 60b. Furthermore, there are two separate capsule propulsion mechanisms for each rod 59, each capsule propulsion mechanism comprising channels 68a, 68b and a hole 69a, 69b in the rod 59. Furthermore, the manifold assembly comprises two capsule receiving tubes 61a, 61b for each rod 59, rather than one.
The purpose of the variation shown in FIGS. 19A-D is that there is no need to ‘reset’ the reciprocating rod after each delivery of a capsule. Instead, each movement of the reciprocating rod corresponds to the delivery of a capsule, i.e. the efficiency of the delivery unit is increased.
In FIG. 19A the right hand recess 60a of the reciprocating 59 rod is aligned with the mouth 62a of the right hand capsule receiving tube 61a. Further, the rod 59 is positioned such that a jet of air may pass through the channels 68a, 69a to propel a capsule 63 from the recess 60a into the tube 61a. As shown, path of air through the channels 68b is blocked by the rod 59. Further, as shown the left hand recess 60b is aligned with the column of capsules 64 in the channel 65 and a capsule 66 has dropped into the recess 60b
The reciprocating rod is then moved leftwards so that the left hand recess 60b is aligned with the mouth of the left tube 61b and the right hand recess 60a is aligned with the column of capsules 64 in the channel 65. In this way, the capsule 66 is transferred to the mouth 62b of the left tube 61b. FIG. 19B shows this step in the instant before the capsule 66 held in the left hand recess 60b is propelled into the tube 61b and the bottommost capsule in the vertical column 64 falls into the right hand recess 60a. As shown, the rod 59 is positioned such that a jet of air may pass through the channels 68b, 69b to propel capsule 66 into tube 61b. As shown, the path of air through the channels 68a, 69a is blocked by the rod 59.
FIG. 19C shows the next step where the capsule 66 has been ejected from the left hand recess 60b under the influence of gravity and propulsion by compressed air and the bottommost capsule 67 in the channel falls into the right hand recess 60a.
The reciprocating rod then shifts rightwards to the position shown in FIG. 19D. As shown, in this position the right hand recess 60a is aligned with the mouth 62a of the right tube 61a and the left hand recess is aligned with the channel 65. This step is shown in the instant before the capsule 67 in the right hand recess is propelled into the outlet and before the bottommost capsule in the channel 65 falls into the left hand recess 60b. The next step in the operation of the delivery means is represented by FIG. 8A and so the process repeats itself.
Although FIGS. 19A-D show various stages in the operation of one reciprocating rod 59, it will be understood that the other reciprocating rods 59 may operate in a similar fashion.
The left and right tubes 61b, 61a corresponding to each rod 59 are converged into a single tube, which is subsequently converged with the corresponding tubes from the other transfer units and into a single output tube. Thus, capsules from any of the left or the right tubes 61b, 61a are guided into the single output tube and into the tow.
FIG. 20 illustrates examples of filter rods which can be manufactured by the machines and methods described herein.
FIG. 20(a) shows a filter rod 70 having a single capsule 71 therein. The filter rod 70 comprises a plug of tow 72, which is cylindrically wrapped by a plugwrap 73. The capsule 71 is disposed centrally within the rod 70 and is surrounded by the tow 72.
FIG. 20(b) shows a filter rod 74 having two capsules 75, 76 therein. The capsules 75, 76 may contain the same flavourant, or may alternatively contain different flavourants.
FIG. 20(c) shows a filter rod 77 having four capsules 78, 79, 80, 81 therein. The capsules 78, 79, 80, 81 may contain the same or different liquid flavourants.
FIG. 21 shows an example of a fluid-filled capsule in the form of breakable gelatin capsule 82. As shown, capsule 82 comprises an outer wall 83 of gelatin and an inner space 84 filled with a liquid flavourant such as menthol.
Although the description above relates to the introduction of fluid-containing capsules such as the capsule 82 into filter rod material during filter rod manufacture, those skilled in the art will appreciate that any object suitable for introduction into filter rods could be alternatively or in addition introduced into the filter rod material, for example pellets, strands, beads or any combination of pellets, strands, beads and capsules.
Many other modifications and variations will be evident to those skilled in the art, that fall within the scope of the following claims: