EP1703810A1 - Scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials - Google Patents

Scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials

Info

Publication number
EP1703810A1
EP1703810A1 EP04820460A EP04820460A EP1703810A1 EP 1703810 A1 EP1703810 A1 EP 1703810A1 EP 04820460 A EP04820460 A EP 04820460A EP 04820460 A EP04820460 A EP 04820460A EP 1703810 A1 EP1703810 A1 EP 1703810A1
Authority
EP
European Patent Office
Prior art keywords
scraper
cutter drum
cutting
shaft
scraper according
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.)
Granted
Application number
EP04820460A
Other languages
German (de)
French (fr)
Other versions
EP1703810B1 (en
Inventor
Wojciech Jerzy Chojnacki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Tobacco Machinery Poland Sp zoo
Original Assignee
International Tobacco Machinery Poland Sp zoo
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Tobacco Machinery Poland Sp zoo filed Critical International Tobacco Machinery Poland Sp zoo
Priority to PL04820460T priority Critical patent/PL1703810T3/en
Publication of EP1703810A1 publication Critical patent/EP1703810A1/en
Application granted granted Critical
Publication of EP1703810B1 publication Critical patent/EP1703810B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/088—Means for treating work or cutting member to facilitate cutting by cleaning or lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
    • B26D1/36—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and rotating continuously in one direction during cutting, e.g. mounted on a rotary cylinder

Definitions

  • Scraper for cleaning surfaces around revolving knives in a cutter drum " for cutting/comminuting organic plant materials, particularly tobacco materials
  • This invention relates lo a scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials.
  • a knife or a plurality of knives is mounted on the circumferential surface of a rotary cutter drum of a cutting machine, as presented in previous applications to ITM Tru Lid.
  • the materials are wetted so that moisture content is appropriate for the organic plant material type and the type of the process/treatment being carried out.
  • the organic plant materials, particularly tobacco materials may be subjected to liquids of much higher density and viscosity than those of water, remaining partially on external surfaces of the processed particles.
  • the compressing force is applied, keeping the continuously fed material within the cutting zone, as well as the cutting/comminuting forces are applied. Mainly under these forces some of viscous liquids are squeezed out from a portion of the plant material, the liquids, when mixed with particles of the organic plant material dust, particularly tobacco, tending do settle in the nearest neighbourhood of the cutting/comminuting knives.
  • the settling process of the combination of the al>ove mentioned liquids and the dust as tiny particles causes building up a layer which hardens when drying and adversely affects the subsequent cutting/comminuting process.
  • the scraper for cleaning surfaces around revolving knives in a culler drum for culling/comminuling organic plant materials, particularly tobacco materials is characterised in that the scraper is mounted in a holder of the rotary shaft of the scraper coupled with the cutter drum shaft, the shaft of the scraper and the cutter drum having a common drive.
  • ratios of the thickness T of the material of the scraper to its working length L satisfy the relationship: — > e , where e is the base of the natural logarithm.
  • the dependency: L ⁇ ' XJD is satisfied between the diameter D of the cutter drum of the cutting machine and the working length L of the scraper.
  • the cutter drum shaft is coupled with the rotary shaft of the scraper via an assembly of tensioners with a driving tension member, which, preferably, has a form of a toothed belt.
  • the scraper is located on the side of the cutter drum opposite relative to the cutting/comminution zone.
  • the holder is mounted on the rotary -shaft at two points.
  • the holder is mounted on the rotary -shaft at three points.
  • Kn denotes the number of the cutting/comminuting knives on the circumference of the drum and No is an arbitrary odd natural number.
  • the above mentioned dependency is 16:3, 16:5 or 16:7 so that the scraper removes the buildup from every successive odd knife, starting from the beginning, for example every 3 rd , every 5 th etc.
  • the rotational speed of the shaft is synchronised with the rotational speed of the cutter drum with the ratio for which the revolving cleaning edge of the scraper contacts every odd in succession blade of the cutting/comminuting knife.
  • Fig. 1 is a side view of the scraper according to the present invention, with the shaft being coupled with the cutter drum;
  • Fig. 2 shows the device from Figure 1 in a perspective view
  • Fig. 3 shows the configuration of the scraper relative to the cleaned knife during the cleaning operation
  • Fig. 4 shows geometrical parameters of the scraper according to the invention.
  • FIG. 5 shows deflection of the scraper according to the invention.
  • Figures 1 and 2 show the rotary shaft 4 equipped with the scraper 3, the rotational speed of which is synchronised with (he rotational speed of the cutler drum 1 with the ratio for which the revolving cleaning edge of the scraper 3 contacts every odd in succession blade of the cutting/comminuting knife 5.
  • the rotational motion of the scraper 3 is transferred from the shaft of the revolving cutter drum 1 via the driving tension member 2 in a form of a belt or a chain, preferable a toothed belt/chain, via an assembly of tensioners
  • Kn denotes the number of the No cutting/comminuting knives 5 on the circumference of the cutter drum 1 and No is an arbitrary odd natural number.
  • n is 16:3, 16:5 or 16:7 so that the scraper 3 removes the buildup from every successive odd knife 5, starting from the beginning, for example every 3 rd , every 5 th etc.
  • the rotary scraper 3 is characteristically configured relative to the cutter drum 1 and its dimensions are beneficially selected so that the rotary tip of the scraper 3 dives into the contour of the trajectory defined by the knives 5 of the cutter drum
  • main parameters determining the optimal depth of the penetration into the area external relative to the upper surface of the knife 5 and the external pressing plate 8, are ratios of the working length L of the scraper 3 to the diameter D of the cutter drum 1.
  • the scraper 3 is placed on the side of the cutter drum 1 opposite relative to the cutting/comminution zone.
  • the geometrical parameters of the scraper 3 arc presented in Fig. 4 and they show preferable proportions of the thickness T of the material of the scraper 3 to its working length L.
  • the dimensions satisfy the relationship: — e , where e is the base of the natural logarithm.
  • the proportion is connected with the functional feature of the scraper 3, the feature being advantageous vibrations of the material of the scraper 3 during its operation.
  • the thickness T of the scraper 3 depends on the material the scraper is made from and on the strength parameters of the material, including rigidity against bending forces and stresses generated due to the operation of the scraper 3 (cyclical interaction with the buildup and its removal) and so occurring deflections d, as shown in Fig. 5. Additionally, in order to obtain the above mentioned results it is preferable to preserve the following dependency: L ⁇ AfD between the diameter D of the cutter drum 1 of the cutting machine and the working length L of the scraper 3.
  • the objective of the manner the scraper 3 is mounted, the objective of the type of the material it is made from as well as the objective of the selection of its dimensional proportions is the mechanical removal (scraping) of the buildup which is a mixing of liquids from the cut/comminuted tobacco material with possible admixture of tobacco particles.
  • One way of achieving this objective is mounting the scraper 3 in the holder 9 of the rotary shaft 4 such that the vibrations of the material of the scraper 3 are obtained and maintained in the preferable range.
  • the scraper 3 is mounted at two points, preferably at three points.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Tobacco Products (AREA)
  • Harvester Elements (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The disclosed scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials, is characterised in that it is mounted in a holder (2) of a rotary shaft (4) coupled with the shaft of the cutter drum (1), the shaft (4) of the scraper (3) and the drum (1) having a common drive. Employing the scraper according to the invention allows for continuous, simple, convenient and reliable removal of the buildup from the blade zone of the cutting/comminuting knife.

Description

Scraper for cleaning surfaces around revolving knives in a cutter drum "for cutting/comminuting organic plant materials, particularly tobacco materials
This invention relates lo a scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials. A knife or a plurality of knives is mounted on the circumferential surface of a rotary cutter drum of a cutting machine, as presented in previous applications to ITM Poland Lid. During treatment of organic plant materials, particularly tobacco materials, the materials are wetted so that moisture content is appropriate for the organic plant material type and the type of the process/treatment being carried out. Additionally, the organic plant materials, particularly tobacco materials, may be subjected to liquids of much higher density and viscosity than those of water, remaining partially on external surfaces of the processed particles. During the cutting/comminuting process of wetted organic plant materials, particularly tobacco materials, the compressing force is applied, keeping the continuously fed material within the cutting zone, as well as the cutting/comminuting forces are applied. Mainly under these forces some of viscous liquids are squeezed out from a portion of the plant material, the liquids, when mixed with particles of the organic plant material dust, particularly tobacco, tending do settle in the nearest neighbourhood of the cutting/comminuting knives. The settling process of the combination of the al>ove mentioned liquids and the dust as tiny particles causes building up a layer which hardens when drying and adversely affects the subsequent cutting/comminuting process. Up to now the cleaning operation of surfaces surrounding the revolving knives in the cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials, was performed manually utilising various manual scrapers. In so far produced machines the removal of the buildup was carried out only after stopping the machine, this adversely affecting the quality of the cut/comminuted organic plant material. According to the invention, the scraper for cleaning surfaces around revolving knives in a culler drum for culling/comminuling organic plant materials, particularly tobacco materials, is characterised in that the scraper is mounted in a holder of the rotary shaft of the scraper coupled with the cutter drum shaft, the shaft of the scraper and the cutter drum having a common drive. Preferably, ratios of the thickness T of the material of the scraper to its working length L satisfy the relationship: — > e , where e is the base of the natural logarithm.
Preferably, the dependency: L≥'XJD is satisfied between the diameter D of the cutter drum of the cutting machine and the working length L of the scraper. The cutter drum shaft is coupled with the rotary shaft of the scraper via an assembly of tensioners with a driving tension member, which, preferably, has a form of a toothed belt. The scraper is located on the side of the cutter drum opposite relative to the cutting/comminution zone. Preferably, the holder is mounted on the rotary -shaft at two points. Preferably, the holder is mounted on the rotary -shaft at three points. The rotational speed n of the shaft of the scraper relative to the rotational speed of Kn the cutter drum of the cutting machine is selected according to the dependency: n = — , No where Kn denotes the number of the cutting/comminuting knives on the circumference of the drum and No is an arbitrary odd natural number. Preferably, the above mentioned dependency is 16:3, 16:5 or 16:7 so that the scraper removes the buildup from every successive odd knife, starting from the beginning, for example every 3rd, every 5th etc. The rotational speed of the shaft is synchronised with the rotational speed of the cutter drum with the ratio for which the revolving cleaning edge of the scraper contacts every odd in succession blade of the cutting/comminuting knife. The revolving scraper according to the invention allows for continuous removal of the forming buildup during operation of the cutting/comminuting machine for organic plant materials, particularly tobacco materials. Employing the inventive scraper allows for continuous, simple, convenient and reliable removal of the buildup from the blade zone of the cutting/comminuting knife. The working tip of the scraper dives into the contour of the trajectory defined by the knives of the drum so that the amount of the removed buildup is possibly maximal without any collision of the two rotating elements. The structure of the scraper allows for advantageous vibrations of the scraper material. The invention will now be described by way of example only with reference to the accompanying drawing, in which: Fig. 1 is a side view of the scraper according to the present invention, with the shaft being coupled with the cutter drum;
Fig. 2 shows the device from Figure 1 in a perspective view;
Fig. 3 shows the configuration of the scraper relative to the cleaned knife during the cleaning operation;
Fig. 4 shows geometrical parameters of the scraper according to the invention; and
Fig. 5 shows deflection of the scraper according to the invention. Figures 1 and 2 show the rotary shaft 4 equipped with the scraper 3, the rotational speed of which is synchronised with (he rotational speed of the cutler drum 1 with the ratio for which the revolving cleaning edge of the scraper 3 contacts every odd in succession blade of the cutting/comminuting knife 5. The rotational motion of the scraper 3 is transferred from the shaft of the revolving cutter drum 1 via the driving tension member 2 in a form of a belt or a chain, preferable a toothed belt/chain, via an assembly of tensioners
6, 7 to the shaft 4 of the scraper 3. The rotational speed n of the shaft 4 of the scraper 3 in relation to the rotational speed of the cutter drum 1 of the cutting machine is selected Kn according to the dependency: n = — , where Kn denotes the number of the No cutting/comminuting knives 5 on the circumference of the cutter drum 1 and No is an arbitrary odd natural number. Preferably, in the above mentioned dependency n is 16:3, 16:5 or 16:7 so that the scraper 3 removes the buildup from every successive odd knife 5, starting from the beginning, for example every 3rd, every 5th etc. Thus after several, for example after 3, 5 etc, revolutions, all the knives 5 and/or their surroundings will be subjected to the operation of the scraper 3. As shown in Fig. 3, the rotary scraper 3 is characteristically configured relative to the cutter drum 1 and its dimensions are beneficially selected so that the rotary tip of the scraper 3 dives into the contour of the trajectory defined by the knives 5 of the cutter drum
1 of the cutting machine so that the amount of the removed buildup is maximal without any collision of the two rotating elements. Preferably, main parameters determining the optimal depth of the penetration into the area external relative to the upper surface of the knife 5 and the external pressing plate 8, are ratios of the working length L of the scraper 3 to the diameter D of the cutter drum 1. Preferably, the scraper 3 is placed on the side of the cutter drum 1 opposite relative to the cutting/comminution zone. The geometrical parameters of the scraper 3 arc presented in Fig. 4 and they show preferable proportions of the thickness T of the material of the scraper 3 to its working length L. Preferably, the dimensions satisfy the relationship: — e , where e is the base of the natural logarithm. The proportion is connected with the functional feature of the scraper 3, the feature being advantageous vibrations of the material of the scraper 3 during its operation. The thickness T of the scraper 3 depends on the material the scraper is made from and on the strength parameters of the material, including rigidity against bending forces and stresses generated due to the operation of the scraper 3 (cyclical interaction with the buildup and its removal) and so occurring deflections d, as shown in Fig. 5. Additionally, in order to obtain the above mentioned results it is preferable to preserve the following dependency: L ≥ AfD between the diameter D of the cutter drum 1 of the cutting machine and the working length L of the scraper 3. The objective of the manner the scraper 3 is mounted, the objective of the type of the material it is made from as well as the objective of the selection of its dimensional proportions is the mechanical removal (scraping) of the buildup which is a mixing of liquids from the cut/comminuted tobacco material with possible admixture of tobacco particles. One way of achieving this objective is mounting the scraper 3 in the holder 9 of the rotary shaft 4 such that the vibrations of the material of the scraper 3 are obtained and maintained in the preferable range. In the presented solution the scraper 3 is mounted at two points, preferably at three points.

Claims

Claims
1. A scraper for cleaning surfaces around revolving knives in a cutter drum for cutling/comminuting organic plant materials, particularly tobacco materials, characterised in that it is mounted in a holder (9) of a rotary shaft (4) coupled with the shaft of the cutter drum (1), the shaft (4) of the scraper (3) and the drum (1) having a common drive.
2. A scraper according to claim 1, characterised in that the proportions of the thickness (T) of the material of the scraper (3) to its working length (L) satisfy the relationship — ≥ e , where e is the base of the natural logarithm.
3. A scraper according to claim 1, characterised in that the diameter (D) of the cutter drum (I) of the cutting machine and the working length (LJ of the scraper (3) satisfy the dependency: L ≥ ^/D .
4. A scraper according lo claim 1, characterised in that the shaft of the cutter drum (1) is coupled with the rotary shaft (4) via an assembly of tensioners (6, 7) with a driving tension member (2).
5. A scraper according to claim 4, characterised in that the driving tension member (2) has a form of a toothed belt
6. A scraper according to claim 4, characterised in that the driving tension member (2) has a form of a toothed chain.
7. A scraper according to claim 1, characterised in that the scraper (3) is placed on the side of the cutter drum (1) opposite relative to the cutting/comminution zone.
8. A scraper according to claim 1, characterised in that the holder is mounted on the rotary shaft (4) at two points.
9. A scraper according to claim 1, characterised in that the holder (9) is mounted on the rotary shaft (4) at three points.
10. A scraper according to claim 1, characterised in that the rotational speed n of the shaft (4) of the scraper (3) relative to the rotational speed of the cutter drum (1) of the Kn cutting machine is selected according to the dependency: n — , where Kn denotes the No number of the cutting/comminuting knives (5) on the circumference of the cutter drum (T) and No is an arbitrary odd natural number.
11. A scraper according to claim 10, characterised in that the mentioned dependency is
16:3.
12. A scraper according to claim 10, characterised in that the mentioned dependency is 16:5.
13. A scraper according to claim 10, characterised in that the mentioned dependency is 16:7.
14. A scraper according to claim 1, characterised in that the rotational speed of the shaft (4) is synchronised with the rotational speed of the cutter drum (1) with the ratio for which the revolving cleaning edge of the scraper (3) contacts every odd in succession blade of the cutting/comminuting knife (5).
EP04820460A 2003-12-11 2004-12-06 Scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials Expired - Lifetime EP1703810B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04820460T PL1703810T3 (en) 2003-12-11 2004-12-06 Scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL364008A PL207090B1 (en) 2003-12-11 2003-12-11 Doctor blade for cleaning the surface of vegetable material, and particularly the tobacco, cutting/ disintegrating drum
PCT/EP2004/053291 WO2005058076A1 (en) 2003-12-11 2004-12-06 Scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials

Publications (2)

Publication Number Publication Date
EP1703810A1 true EP1703810A1 (en) 2006-09-27
EP1703810B1 EP1703810B1 (en) 2009-02-25

Family

ID=34699204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04820460A Expired - Lifetime EP1703810B1 (en) 2003-12-11 2004-12-06 Scraper for cleaning surfaces around revolving knives in a cutter drum for cutting/comminuting organic plant materials, particularly tobacco materials

Country Status (6)

Country Link
EP (1) EP1703810B1 (en)
AT (1) ATE423477T1 (en)
DE (1) DE602004019690D1 (en)
MY (1) MY158854A (en)
PL (2) PL207090B1 (en)
WO (1) WO2005058076A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113442207B (en) * 2021-05-21 2022-06-24 中国联合工程有限公司 Cleaning device and cleaning method for inner surface and outer surface of circular cutting edge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB423344A (en) * 1934-02-02 1935-01-30 Muller J C & Co Tobacco cutting machine
GB662790A (en) * 1949-03-24 1951-12-12 Robert Legg Ltd Improvements in or relating to machines for cutting leaf tobacco and similar materials
GB913164A (en) * 1958-10-03 1962-12-19 Valentine Pearce Harvey Improvements in knife cleaning devices for rotary tobacco cutting machines
GB913117A (en) * 1959-05-13 1962-12-19 Und Eisengiesserei A Heinen G Improvements in or relating to tobacco cutting machines
GB1089362A (en) * 1964-02-18 1967-11-01 Desmond Walter Molins Improvements concerning tobacco cutting machines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005058076A1 *

Also Published As

Publication number Publication date
PL207090B1 (en) 2010-10-29
DE602004019690D1 (en) 2009-04-09
WO2005058076A1 (en) 2005-06-30
EP1703810B1 (en) 2009-02-25
ATE423477T1 (en) 2009-03-15
MY158854A (en) 2016-11-15
PL364008A1 (en) 2005-06-13
PL1703810T3 (en) 2009-08-31

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