Patent Grant
11819050
Cigarette producing machinery is quite complex and costly. The pre-processed filler material is measured out with a metering device. The key component in a metering device is the metering drum, also known as a “picker roller”. Currently, metering drums are constructed with a multitude of needles or blades arranged on the outer perimeter of the metering drum. This design is more suitable for processing long fiber filler material rather than smaller particles including dust. The metering device should also be easy to clean because certain filler material, such as cannabis-based products and some tobacco blends, can be quite sticky. The metering drum often requires the most attention when cleaning, but needles or sharp blades on the perimeter can prove to be quite difficult to contend with and also hazardous for the operator. In addition, the stickier the filler material, the more frequent cleaning is necessary. It can take considerable time to clean the machine parts that are soiled from the sticky material (metering rollers, garniture format parts, etc.). Unfortunately, these components in current cigarette machines are not designed for quick access or removal.
Cigarette producing machinery commonly operates by forming a continuous cigarette rod which is cut into discrete lengths. It involves intricate mechanisms such as, for example, a vacuum conveyor with a trimmer to produce cigarettes with high weight accuracy. Such complex and expensive technology is typically not cost effective for use with lower priced cigarette production machines. On the other hand, there is still a need to produce cigarette rods of a fairly consistent weight. Pre-processed tobacco, hemp, and marijuana, referred to herein as “filler material,” is fed through machinery that employs multi-stage rollers and separators. The filler material is then dispensed onto a conveying device. In order to create an even and precise path of filler material, the filler material will adhere to the conveyor by the means of a vacuum and will be precisely trimmed by a rotating knife to uniform layer thickness as it moves along.
The trimmed filler material forms a strand, which will be subsequently released from the vacuum conveyor to be pre-formed into a cylindrical shape and wrapped into a cigarette paper. The result is a round and continuous rod. This “endless” rod will be cut to a specific length in subsequent steps.
State of the art cigarette producing machinery uses parts designed to preform tobacco into a cylindrical shape, wrap the formed tobacco within a roll of cigarette paper, and glue the overlapping seam so an “endless cigarette rod” is continuously produced. These parts are arranged in-line and fixed to a machine bed or frame. These parts are also known as “garniture format parts”. The garniture format parts can be adjusted to improve the cigarette rod appearance. To produce a different cigarette rod diameter, the garniture parts may be replaced with a different set of parts. This is known as a format “change-over”, and this procedure requires the machine to stop, power down, and remain powered down until the format change is completed. In addition, the format parts involved in such a “change-over” take time to disassemble and reassemble in the machinery. The individual parts must be unbolted from the machine bed or frame and new parts have to be individually bolted back to the machine frame. Most likely, some adjustment will also need to be done to ensure that the replacement parts are performing correctly. This is a time consuming procedure during which the machine is not producing.
As mentioned, it is not unusual for the garniture format parts to also require periodic cleaning because of the sticky nature of the tobacco blends or cannabis products. Some of the format parts, such as, for example, the rod forming tongue, have direct contact with the sticky material, which tends to adhere to the parts and accumulate to a point where a thorough cleaning is necessary to continue operation. In this case, the soiled garniture format parts must be removed and cleaned, which tends to be more time-consuming and results in longer downtime.
The current technology in tobacco cigarette machinery requires two motors, one for driving the cigarette rod cutter head and another for driving the acceleration wheel. This often increases the size of the machines and increases cost, which can make them unfeasible or at least less desirable for manufacturing lower cost cigarette products.
Current cigarette manufacturing machines also typically use a High-Speed Steel (HSS) knife with either a motorized grinding disk or spring loaded grinding stones to keep the HSS knife sharp. This arrangement also increases costs, due to the addition of a sharpener and reduces space around the HSS knife.
Existing spline shaft style Ledge Tubes have only rough adjustment points. This can result in loss of quality and consistency in the cigarette quality when operated at speeds above 100 cigarettes per minute (CPM).
Embodiments of the subject invention address the problems discussed above by providing improved cigarette manufacturing machinery with components that are easy to disassemble and clean, as well as an improved design that requires a single motor for rod cutting operation. Specifically, embodiments of the subject invention utilize simple and multiple metering drums, quick change garniture parts, and a single motor that operate with a spline shaft to drive both the cutting knife and the accelerating wheel.
Conventional metering drums (also known as “picker rollers”) have sharp needles or blades attached to the outside of the drum perimeter for “picking-up” and processing long fiber tobacco, but which are not ideal for handling smaller pieces that may not be efficiently picked up the needles or blades.
Embodiments of the subject invention provide a cavity drum capable of handling and dispensing smaller particles eliminating the need for complex drums with sharp needles or blades. This can make the cavity drum easier and safer to handle and certain embodiments allow for a “quick change assembly”. The entire cavity drum unit can be removed for cleaning, maintenance, or replacement, and quickly re-installed, thus saving valuable production time.
In addition, removing a conventional metering drum for cleaning can be cumbersome because metering drums currently used in cigarette manufacturing machinery are rather large. The metering drum can often be too bulky and possibly too heavy to be safely handled by the operator, particularly because of the sharp needles or blades. The use of a single or multiple cavity drums in place of a conventional metering drum in a metering device solves this problem. In one embodiment, multiple, removable cavity drums are used. In one embodiment, a cavity drum has a diameter that can be smaller than a conventional metering drum and the improved design can make the removable cavity drum assembly easier to handle.
A typical cigarette manufacturing machine has lower channel parts mounted to a machine frame. The lower machine parts usually have a U-shaped channel by which a garniture belt is guided. The garniture belt is consequently shaped by the channel into a U-shape. Atop the U-shaped garniture belt rests a narrow strip of cigarette paper unwound from a roll (bobbin) in which the continuous line of tobacco, hemp, or other “filler material” is deposited. On top of the garniture belt, cigarette paper, and the filler is a set of individual upper format parts such as, for example, a rod forming tongue, pre-folding block, diameter control folding block, etc. that perform different operations in manufacturing a finished cigarette rod. The upper format parts can be bolted to the machine frame and “sandwich” the garniture belt, the cigarette paper, and the filler with the lower channel parts.
The garniture belt is typically an endless narrow conveyor belt, which conveys the continuous stream of filler material on top of the cigarette paper through the format parts. After the filler material is wrapped in a continuous length of cigarette paper—the garniture belt carries the continuous length of cigarette rod to a cutter head. It is important that the format parts be precisely positioned relative to the garniture belt, so that they are the proper distance and position to shape the cigarette paper and the filler material as it passes by on the garniture belt. In the event the garniture belt must be removed or the garniture format parts are changed for a different size in order to produce a different diameter cigarette rod, it is necessary to disassemble the individual format parts from the machine frame, which is a time-consuming operation.
One embodiment of the subject invention employs a modular garniture format parts bank. With this embodiment, the lower channel, which includes the lower format parts, is referred to as the “bank” to which all the upper format parts are securely connected, such as with bolts. The bank, the garniture belt, and the upper format parts can be configured as a removable modular unit. The garniture belt can be removed with the between the bank and the upper format parts by releasing a tension roller.
A “quick format parts replacement” option is a cost saving feature in any production environment. This option is even more beneficial in a high speed production environment, such as cigarette manufacturing where one machine is capable of producing about 16,000 cigarettes each minute. Having the ability to quickly remove garniture format parts is particularly advantageous for two reasons. First, when cigarette rods of different diameter are being manufactured, the operator can have one or more banks available with format parts already bolted thereto and properly adjusted to the different product sizes. The replacement of one format to another can be simpler and takes much less time. If it becomes necessary to clean the format parts, an identical bank with garniture format parts can be ready and available to quickly replace the set that needs to be cleaned.
Conventional cigarette manufacturing machinery has multiple moving parts involved in cutting the cigarette rod, typically driven with at least two motors.
Embodiments of the subject invention provide a cutter head designed to operate with one motor to drive the operations of the cigarette manufacturing machine. In one embodiment, a single motor drives a spline shaft and a cam disk. The spline shaft can rotate the cam disk to turn an acceleration wheel at a fixed ratio that matches the CPM (cigarette per minute) speed. The spline shaft can also rotate a cutting knife. An eccentric adjustment disk connects to a follower slot that can adjust the ledge tube movement based on the desired rod length precisely. The cutting system uses a single axis to drive both the knife cutter and the acceleration wheel. The simultaneous rotation and linear motion is achieved by a combination of spline shaft and cam adjustment disk. This eccentric adjustment disk enables precise and smooth product length change without exchanging parts.
The acceleration wheel can be driven by the same motor by rotation of the spline shaft. The speed of the acceleration wheel is proportional to the CPM production speed. It is not affected by the product length. Vacuum is applied through ports in the acceleration wheel to enhance the effect of the acceleration through sliding.
Carbide material can be used for the cutting knife. This eliminates the need for either passive or an active grinder. It saves footprint, reduces part and maintenance cost, and makes the assembly more economical.
It should be noted that this Brief Summary is provided to generally introduce the reader to one or more select concepts described below in the Detailed Disclosure in a simplified form. This Summary is not intended to identify key and/or required features of the claimed subject matter. Other aspects and further scope of applicability of the present invention will also become apparent from the detailed descriptions given herein. It should be understood, however, that the detailed descriptions, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent from such descriptions. The invention is defined by the claims below.
In order that a more precise understanding of the above recited invention can be obtained, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. The drawings presented herein may not be drawn to scale and any reference to dimensions in the drawings or the following description is specific to the embodiments disclosed. Any variations of these dimensions that will allow the subject invention to function for its intended purpose are considered to be within the scope of the subject invention. Thus, understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered as limiting in scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
Embodiments of the subject invention pertain to cigarette manufacturing machinery. More specifically, embodiments of the subject invention provide cavity drums that can be utilized in a metering device, a modular garniture format parts bank, and a cigarette rod cutter head that can be used with cigarette manufacturing machinery.
The following description will disclose that the subject invention is particularly useful in the field of cigarette manufacturing. A person with skill in the art will be able to recognize numerous other uses that would be applicable to the devices and methods of the subject invention. While the subject application describes, and many of the terms herein relate to, a use for cigarette manufacturing, other modifications apparent to a person with skill in the art and having benefit of the subject disclosure are contemplated to be within the scope of the present invention.
As used herein, terms indicating relative direction or orientation, including but not limited to “upper”, “lower”, “top”, “bottom”, “vertical”, “horizontal”, “outer”, “inner”, “front”, “back”, and the like, are intended to facilitate description of the present invention by indicating relative orientation or direction in usual use, and are not intended to limit the scope of the present invention in any way to such orientations or directions.
Also, as used herein, and unless otherwise specifically stated, the terms “operable communication,” “operable connection,” “operably connected,” “cooperatively engaged” and grammatical variations thereof mean that the particular elements are connected in such a way that they cooperate to achieve their intended function or functions. The “connection” or “engagement” may be direct, or indirect, physical or remote.
It is to be understood that the figures and descriptions of embodiments of the present invention have been simplified to illustrate elements that are relevant for a clear understanding of the invention, while eliminating, for purposes of clarity, other elements that may be well known. Those of ordinary skill in the art will recognize that other elements may be desirable and/or required in order to implement the present invention. However, because such elements are well known in the art, and because they do not facilitate a better understanding of the present invention, a discussion of such elements is not provided herein. As used in the specification and in the claims, the singular for “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise.
Reference will be made to the attached figures on which the same reference numerals are used throughout to indicate the same or similar components. With reference to the attached figures, which show certain embodiments of the subject invention, it can be seen that embodiments of the subject invention pertain to components of cigarette manufacturing machinery 10 for dispensing a filler material 12. The machinery can include a metering device 100 that can utilize one or more cavity drums 150, a modular garniture format parts bank 300 that can be removed intact from the cigarette manufacturing machinery, and a combination spline shaft 400 and bevel gear 450 that can be rotated by a single motor 500 to operate a cigarette cutter head 600 that includes a knife 650 that cuts a cigarette rod into individual cigarettes of the proper length and an acceleration wheel 700 that advances the cut cigarette exiting a ledger tube. Each of these general components can have one or more sub-components, which will be discussed in detail below.
The cigarette manufacturing machinery is used to form cylindrical shaped cigarettes. It can comprise separate components that perform different functions during the manufacturing process. The process can begin when an operator deposits a filler material 12, such as, for example, tobacco, hemp, marijuana, or similar types of material, through a fixed safety grid 101 and into the hopper 102 of a metering device 100, one example of which is shown in
A metering device 100 can have one or more cavity drums 150 arranged across the bottom of the chute. The filler material 12 inside the chute 107 covers the cavity drums 150. The filler material in the chute can be divided into smaller portions by the rotational operation of the one or more cavity drums 150. The cavity drums of embodiments of the subject invention have several advantages, including being smaller and lighter for easier handling, reducing the overall height of the metering device, and making it easier to deposit filler material from the hopper 102. One particular advantage of using more than one cavity drum of a smaller diameter is the ability to operate the cavity drums at a slower speed, allowing more of the filler material to nest and settle more effectively within the cavities 152 of the cavity drum and still maintain the optimal level or speed of operation.
In one embodiment, a cavity drum 150 is an elongated roller that has a plurality of elongated cavities 152 that extend along the length or axis 159 of the roller into which the filler material is deposited as the cavity drum is rotated.
As the cavity drums 150 rotate, the filler material passes between the cavity drums and one or more metering bars 160 positioned in proximity to the cavity drums. There can be a gap 161 between the rotating cavity drums and the stationary metering bar that controls the amount of filler material in the cavities 152. The gap can be adjustable.
The filler material 12 in the cavities 152 is rotated around, past the metering bars 160, to provide a predetermined amount of filler material in each cavity. When the cavities rotate towards the bottom of the metering device, the pre-determined amount of filler material then cascades down on top of an apron conveyor 109, as it leaves the cavities in the cavity drums. One example of this is shown in
Some tobacco, but mainly hemp, can have small flakes that can be “scooped” with cavities 152 of the cavity drum 150 embodiments more effectively than can be done with needles or blades of a conventional metering device, which are intended more for longer fibers found in traditional cigarettes. The cavities being more effective at scooping the finer particle and dust can result in being more effective at processing hemp/marijuana cigarettes, because they utilize more of the filler material and minimize waste.
It can be important that the filler material is properly nested inside the individual cavities and is cleanly released as the cavity drum rotates over the apron conveyor. Though, some filler materials tend to be stickier than others. Stickier filler materials will require frequent cleaning. In one embodiment, a cavity drum 150 is removable from the metering device, allowing for quick and easy cleaning. State of the art machinery typically does not incorporate easily removable components because tobacco blends are mostly not tacky or sticky, whereas cannabis plants can have a fair amount of sticky resin. The cleaning of soiled components can take some time, even a few hours in some cases. This can cause undesirable production downtime.
The cavity drums 150 can be in direct contact with the filler material. Advantageously, cavity drums of embodiments of the subject invention can be modular, in that they can be easily removed and replaced within the metering device. This can allow the cavity drums to be cleaned and/or replaced or as necessary and/or swapped with other cavity drums, with minimal down time in production.
In one embodiment, a cavity drum 150 is constructed so as to be supported by a sidewall 50 and an opposite sidewall 55 of the metering device 100. The cavity drum can have an “operator end” 151 and an opposite “drive end” 153. In a further embodiment, the cavity drum 150 is removable, in a sideways manner, through an opening in the sidewall 50 of the metering device 100, and re-inserted therethrough after cleaning, an example of which is shown in
The design of the cavities of a cavity drum can depend upon the properties of the filler material. For example, the size of the cavities can directly depend on the size of the filler material particles. For another example, the surface roughness, surface treatment, and the material of which the cavity drum is fabricated can depend on the stickiness of the filler material. The perimeter 154 of the cavities in a cavity drum, seen in
Some filler material 12 can be too moist or sticky and can benefit from being “fluffed-up” once sitting above the cavity drums 150, which helps to break possible air-pockets and nest the filler material 12 correctly inside the cavities 152 of the cavity drums 150. Thus, the metering device 100 can include skirts 190,192 in the chute 107 above the cavity drums 150, as seen in
Once the filler material 12 has been spread onto the apron conveyor 109, as demonstrated in the example in
Embodiments of the subject invention utilize a modular garniture format parts bank 300 that can be removed and reattached as a unit to the frame 11 of the cigarette manufacturing machinery. The modular garniture format parts bank 300 can include upper format parts 310 that are operably attached to a lower format parts bank 315 and sandwich or entrap the garniture belt 305 therebetween. In one embodiment, the modular garniture format parts bank 300 is attached to the frame of the cigarette manufacturing machinery at a predetermined location and secured with bolts, screws, hand knobs, snapping locks, or other means known in the art. One example of this is shown in
The garniture belt 305 is rotated by operable attachment to a drive roller 350, a driven roller 355, and a tension roller 360, which each apply tension by taking up slack in the garniture belt, as shown in
The garniture belt can move the stream of filler material through the modular garniture format parts bank 300 to be wrapped in continuous cigarette paper and glued closed in a long cigarette rod. This long cigarette rod is moved towards a cutter head 600 where the cigarette rod is precisely cut into individual cigarettes by a knife 650. In conventional cigarette manufacturing machinery, one motor is employed to operate the knife that rotates and cuts the cigarette rod as it passes through a cutting slot 625 in a ledger tube 620 and a second motor is employed to turn an acceleration wheel 700 that advances the cigarette rod on a V-way bed 630 downstream and therefore out of the ledger tube 620. The knife can be adjusted with a knife adjustment bolt 670. A safety interlock 680 can be used with a protection hood. The safety interlock 680 is a safety switch attached to the guarding/protection hood, locking the protection hood and inhibiting or preventing it from being opened during operation. If the guarding were to be opened during operation, the safety interlock 680 can stop the motion of the knife or the entire machine on the spot to inhibit or prevent injuries.
Embodiments of the subject invention provide a simplified cutter head 600 that utilizes a single motor 500 operably attached to a spline shaft 400 that is engaged with a gear 450 at a first end 410 to the motor at or near the second end 420. The single motor can drive the spline shaft, which turns the bevel gears 450, which turns the acceleration wheel 700 at a fixed ratio that corresponds to the CPM speed. The same motor can also drive the eccentric cam adjustment disk 800 (which can also be referred to as “eccentric adjustment disk”). The cam adjustment disk connects to a follower slot that precisely adjusts the ledger tube 620 movement based on the desired cigarette length. The ledger tube 620 must be synchronized with the knife rotation, and this is why it moves in linear fashion with the knife. The knife passes through the slot in the ledger tube and cuts the cigarette rod in the process.
The cutter head 600, such as shown in
The discharge acceleration wheel 700 is driven by the bevel gear 450 rotated by the same motor 500 through the spline shaft 400. The speed of the discharge acceleration wheel is proportional to the production speed and is not affected by the product length. In an embodiment, vacuum is applied to the acceleration wheel, having a plurality of vacuum ports 725 via an acceleration wheel vacuum line 720, shown for example in
There can also be a knife cage 660 that controls linear motion of the knife. In one embodiment, the eccentric adjustment disk 800 has at least one fine adjustment slot 840 for adjustment of the position of the post, which adjusts the knife, relative to the cutting slot 625 position during rotation. This can provide more precise placement of the knife and inhibit breakage of the blade by hitting the ledger tube 620, through which the cigarette rod is passed for cutting. The fine adjustment slot(s) 840 can allow the eccentric adjustment disk 800 to be rotated thereby increasing or decreasing the rotation radius of ledger follower plate 830. With that, the linear motion (equal to two times the rotation radius) of the rotating knife cage 660 on the spline shaft 400 will be also increased or decreased. In a further embodiment, carbide material is used for the cutting knife. This can eliminate the need for either a passive grinder or an active grinder. This can provide a smaller footprint, reduce part and maintenance costs, and makes the assembly more economical.
Certain filler material (e.g., primed hemp (e.g., milled to smaller particles so it can be processed in the machine)) includes a considerable amount of fine dust. Some cigarettes manufacturers prefer the dust to be included in the product while some prefer to sieve it out. In some embodiments, a belt scraper 200 can be employed with the apron conveyor 109 to separate most or all of the dust from the solid flakes. The dust is collected in a dust collection pane 182 beneath the apron conveyor 109 and such fine dust can be used in other non-cigarette products such as creams, soaps, etc. The scraper 200 can help to separate the dust from coarse particles, and the gap between the scraper 200 edge (e.g., edge of element 202) and the surface of the belt of the apron conveyer 109 can be adjustable.
In some cases the operation requires direct contact between the scraper strip 202 and the surface of the belt of the apron conveyer 109. The scraper strip 202 in certain embodiments can be configured to not wear off the belt. For example, the scraper strip 202, which contacts the filler material (and possibly the belt) can be made out of heavy weight paper (e.g., 200 grams per square meter (gsm) to 500 gsm, or about 200 gsm to 500 gsm). Such a paper strip may need to be replaced during the machine operation (e.g., about twice per 8-hour shift), so it can have a “quick change” tool-less feature for changing it out. The scraper assembly base 210 can include a bar 211 and two arms 212 and can be adjusted relative to the fixed surface of the belt of the apron conveyer 109. The arms 212 can be slotted for attachment to the chute 107 structure (e.g., via fasteners 201, which can be fastened to a connection structure 214; the fasteners 201 can be any suitable fastener, including but not limited to pins, screws, or bolts). The bar 211 can also include two pins 213 and one or more magnets 215. The scraper strip 202 can include holes 203 to match the location of the pins 213, such that the scraper strip 202 can hang on the pins 213.
The scraper strip 202 can be secured with a secondary strip 205 (e.g., a thin, flexible, metallic (magnetic) strip), which can also be equipped with two matching holes 206 for hanging on the pins 213. The secondary strip 205 can also have extra attachment to the bar 211 via the one or more magnets 215 (e.g., if the secondary strip 205 is magnetic). The secondary strip 205 hangs on the two pins 213, sandwiches the scraper strip 202 between itself and the bar 211 and makes sure that the edge of the scraper strip 202 stays in the desired location with respect to the surface of the belt of the apron conveyer 109 during operation.
In order to extend the life of the scraper strip 202, a second pair of holes 203 can optionally be included on the other side of the scraper strip 202; if the “working edge” of the scraper strip 202 becomes too moist, sticky, or wavy and therefore unusable, the operator can turn the scraper strip 202 upside down utilizing the second pair of holes 203 (e.g., by first removing the secondary strip 205, turning the scraper strip 202 upside down utilizing the second pair of holes 203, and then reattaching the secondary strip 205).
As mentioned, some producers want to include the dust from filler material inside the cigarette. Thus, in an embodiment, the apron conveyer 109 and scraper 200 can be omitted, and a funnel system can instead be included in the metering device 100, as shown in
The transitional term “comprising,” “comprises,” or “comprise” is inclusive or open-ended and does not exclude additional, unrecited elements or method steps. By contrast, the transitional phrase “consisting of” excludes any element, step, or ingredient not specified in the claim. The phrases “consisting” or “consists essentially of” indicate that the claim encompasses embodiments containing the specified materials or steps and those that do not materially affect the basic and novel characteristic(s) of the claim. Use of the term “comprising” contemplates other embodiments that “consist” or “consisting essentially of” the recited component(s). When the term “about” is used herein, in conjunction with a numerical value, it is understood that the value can be in a range of 95% of the value to 105% of the value, i.e. the value can be +/−5% of the stated value. For example, “about 1 kg” means from 0.95 kg to 1.05 kg.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application.
All patents, patent applications, provisional applications, and publications referred to or cited herein are incorporated by reference in their entirety, including all figures and tables, to the extent they are not inconsistent with the explicit teachings of this specification.
This application claims the benefit of U.S. Provisional Application Ser. No. 63/105,649, filed Oct. 26, 2020, the disclosure of which is hereby incorporated by reference in its entirety, including any figures, tables, and drawings.
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| Number | Date | Country |
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| 0016647 | Mar 2000 | WO |
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| Number | Date | Country | |
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| 20220125098 A1 | Apr 2022 | US |
| Number | Date | Country | |
|---|---|---|---|
| 63105649 | Oct 2020 | US |
