WO2017006198A1 - Rotary cutting device, particularly for cutting tobacco - Google Patents

Rotary cutting device, particularly for cutting tobacco Download PDF

Info

Publication number
WO2017006198A1
WO2017006198A1 PCT/IB2016/053608 IB2016053608W WO2017006198A1 WO 2017006198 A1 WO2017006198 A1 WO 2017006198A1 IB 2016053608 W IB2016053608 W IB 2016053608W WO 2017006198 A1 WO2017006198 A1 WO 2017006198A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
cutting device
rotary cutting
fixed
motor
Prior art date
Application number
PCT/IB2016/053608
Other languages
French (fr)
Inventor
Mario Martin
Original Assignee
Comas Costruzioni Macchine Speciali S.P.A.
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 Comas Costruzioni Macchine Speciali S.P.A. filed Critical Comas Costruzioni Macchine Speciali S.P.A.
Publication of WO2017006198A1 publication Critical patent/WO2017006198A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C1/00—Elements of cigar manufacture
    • A24C1/16—Treating bunches
    • A24C1/24—Cutting bunches to length
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B7/00—Cutting tobacco
    • A24B7/04—Cutting tobacco by machines with revolving knives
    • A24B7/08—Cutting tobacco by machines with revolving knives with several knives which act one after the other
    • A24B7/12—Cutting tobacco by machines with revolving knives with several knives which act one after the other with cutter axes transverse to the feeding direction

Definitions

  • Rotary cutting device particularly for cutting tobacco
  • the present invention relates to a rotary cutting device, particularly for cutting tobacco. More specifically, the invention proposes a rotary cutting device of the type comprising: a bearing structure which is stationary in operation,
  • a cutting assembly mounted around said shaft and rotatable therewith, and including a plurality of peripheral longitudinal blades, designed to penetrate a block of tobacco fed towards the cutting assembly;
  • Rotary cutting devices of this type are known, for example, from European patent applications EP 0 293 384 Bl and EP 0 584 524 Bl in the name of the present applicant.
  • the drive means coupled to the shaft typically comprise a pulley which is coupled via a transmission belt to the rotor of an electric motor, positioned transversely offset and substantially parallel to said shaft.
  • One object of the present invention is to provide a rotary cutting device which can overcome the aforementioned drawbacks of the prior art devices.
  • the drive means comprise a slip ring motor, including an outer stator, fixed to said bearing structure and an annular inner rotor, fixed coaxially to an end of the aforesaid shaft.
  • this slip ring motor is a multi-phase asynchronous torque motor.
  • the device according to the invention is structurally simpler and considerably less cumbersome than the prior art devices. Furthermore, it is much less noisy in operation.
  • Figure 1 is a view in axial section of a rotary cutting device according to the present invention.
  • Figure 2 is a partial view which shows, on an enlarged scale, part of the device illustrated in Figure 1.
  • the number 1 indicates the whole of a rotary cutting device according to the invention, particularly for cutting tobacco.
  • This device 1 comprises a bearing structure 2 which is stationary in operation.
  • the device 1 further comprises a shaft, indicated as a whole by 3, supported rotatably about an axis A-A, which is preferably horizontal.
  • the shaft 3 comprises an intermediate cylindrical body 3a and two end heads 3b and 3c rotatable in respective bearing supports 4, 5 mounted in the bearing structure 2.
  • the device 1 further comprises a cutting assembly indicated as a whole by 6, mounted around the intermediate body 3a of the shaft 3, and rotatable therewith about the axis A-A.
  • the cutting assembly 6 includes a plurality of peripheral longitudinal blades 7, designed to penetrate a block of tobacco fed towards the cutting assembly 6 through an opening 8 formed in the bearing structure 2.
  • the electric motor 12 further comprises an outer stator 13, made from a stack of plates and equipped with windings 14. This stator is fixed to the bearing structure 2.
  • the rotor 1 1 of the slip ring motor 12 also has an annular configuration, and extends around the hub 9 fixed to the end 3 b of the shaft 3.
  • the electric motor 12 is what is known as an AC "torque motor" of the multi-phase asynchronous type.
  • a shaped, essentially disc-like, cover 15 encloses the end of the motor 12 which faces in the opposite direction to the cutting assembly 6.
  • the solution according to the present invention can also be implemented in pre-existing cutting devices, by installing a slip ring motor such as that shown in the drawings, in place of the pulley round which runs the transmission belt coupling the shaft of the cutting assembly to an electric driving motor.
  • the rotary cutting device according to the present invention has a very simple configuration, considerably reduced overall dimensions, and simpler maintenance, since there is no need for the periodic replacement of a transmission belt. It also has a very low operating noise level.

Landscapes

  • Manufacture Of Tobacco Products (AREA)

Abstract

The rotary cutting device (1) comprises a stationary bearing structure (2), a shaft (3) rotatable about an axis (A-A), a cutting assembly (6) mounted around the shaft (3) and rotatable therewith, and including a plurality of peripheral longitudinal blades (7), designed to penetrate a block of tobacco fed towards the cutting assembly (6), and a drive unit coupled to one end (3b) of the shaft (3) and capable of causing the-shaft to rotate about said axis (A-A). The drive unit comprises a slip ring motor (12), including an outer stator (13, 14), fixed to the bearing structure (2), and an annular inner rotor (11), fixed coaxially to an end (3b) of the shaft (3).

Description

Rotary cutting device, particularly for cutting tobacco
The present invention relates to a rotary cutting device, particularly for cutting tobacco. More specifically, the invention proposes a rotary cutting device of the type comprising: a bearing structure which is stationary in operation,
a shaft supported in this structure so as to be rotatable about an axis,
a cutting assembly mounted around said shaft and rotatable therewith, and including a plurality of peripheral longitudinal blades, designed to penetrate a block of tobacco fed towards the cutting assembly; and
drive means coupled to one end of said shaft and capable of causing the shaft to rotate about said axis.
Rotary cutting devices of this type are known, for example, from European patent applications EP 0 293 384 Bl and EP 0 584 524 Bl in the name of the present applicant.
In rotary cutting devices of the aforementioned type made up to the present time, the drive means coupled to the shaft typically comprise a pulley which is coupled via a transmission belt to the rotor of an electric motor, positioned transversely offset and substantially parallel to said shaft.
This solution is relatively complicated, requiring a variety of components, and is rather cumbersome. One object of the present invention is to provide a rotary cutting device which can overcome the aforementioned drawbacks of the prior art devices.
These and other objects are achieved according to the invention with a rotary cutting device of the type specified above, characterized in that the drive means comprise a slip ring motor, including an outer stator, fixed to said bearing structure and an annular inner rotor, fixed coaxially to an end of the aforesaid shaft. Conveniently, this slip ring motor is a multi-phase asynchronous torque motor.
The device according to the invention is structurally simpler and considerably less cumbersome than the prior art devices. Furthermore, it is much less noisy in operation.
Further characteristics and advantages of the invention will be apparent from the following detailed description, provided purely by way of non-limiting example, with reference to the attached drawings, in which:
Figure 1 is a view in axial section of a rotary cutting device according to the present invention; and
Figure 2 is a partial view which shows, on an enlarged scale, part of the device illustrated in Figure 1.
In Figure 1 , the number 1 indicates the whole of a rotary cutting device according to the invention, particularly for cutting tobacco. This device 1 comprises a bearing structure 2 which is stationary in operation.
The device 1 further comprises a shaft, indicated as a whole by 3, supported rotatably about an axis A-A, which is preferably horizontal.
In the illustrated exemplary embodiment, the shaft 3 comprises an intermediate cylindrical body 3a and two end heads 3b and 3c rotatable in respective bearing supports 4, 5 mounted in the bearing structure 2. The device 1 further comprises a cutting assembly indicated as a whole by 6, mounted around the intermediate body 3a of the shaft 3, and rotatable therewith about the axis A-A.
In a known way, the cutting assembly 6 includes a plurality of peripheral longitudinal blades 7, designed to penetrate a block of tobacco fed towards the cutting assembly 6 through an opening 8 formed in the bearing structure 2.
In the illustrated exemplary embodiment (see, in particular, Figure 2), at the end or head 3b of the shaft 3 there is fixed a hub 9, forming a shaped transverse flange 10 which projects radially and is fixed directly to the rotor 1 1 of a slip ring motor indicated as a whole by 12.
The electric motor 12 further comprises an outer stator 13, made from a stack of plates and equipped with windings 14. This stator is fixed to the bearing structure 2.
The rotor 1 1 of the slip ring motor 12 also has an annular configuration, and extends around the hub 9 fixed to the end 3 b of the shaft 3. Conveniently, the electric motor 12 is what is known as an AC "torque motor" of the multi-phase asynchronous type.
A shaped, essentially disc-like, cover 15 encloses the end of the motor 12 which faces in the opposite direction to the cutting assembly 6.
The solution according to the present invention can also be implemented in pre-existing cutting devices, by installing a slip ring motor such as that shown in the drawings, in place of the pulley round which runs the transmission belt coupling the shaft of the cutting assembly to an electric driving motor.
The rotary cutting device according to the present invention has a very simple configuration, considerably reduced overall dimensions, and simpler maintenance, since there is no need for the periodic replacement of a transmission belt. It also has a very low operating noise level.
Clearly, provided that the principle of the invention is retained, the forms of application and the details of construction can be varied widely from what has been described and illustrated purely by way of non-limiting example, without thereby departing from the scope of the invention as defined in the attached claims.

Claims

1. Rotary cutting device ( 1 ), particularly for cutting tobacco, comprising
a bearing structure (2) which is stationary in operation,
a shaft (3) supported in said structure (2) so as to be rotatable about an axis (A-A), a cutting assembly (6) mounted around said shaft (3) and rotatable therewith, and including a plurality of peripheral longitudinal blades (7), designed to penetrate a block of tobacco fed towards the cutting assembly (6), and
drive means coupled to one end (3b) of said shaft (3) and capable of causing the shaft to rotate about said axis (A-A);
the device (1 ) being characterized in that the drive means comprise a slip ring motor (12), including an outer stator (13, 14), fixed to said bearing structure (2), and an annular inner rotor (1 1), fixed coaxially to an end (3b) of said shaft (3).
2. Rotary cutting device according to Claim 1 , wherein said electric motor (12) is a multi-phase asynchronous torque motor.
3. Rotary cutting device according to any one of the preceding claims, wherein said slip ring motor is connected to the shaft (3) by means of a hub fixed to one end (3b) of said shaft (3) and forming a radially projecting flange (10) fixed to the rotor (1 1 ) of said motor (12).
4. Rotary cutting device, substantially as described and illustrated, and for the specified purposes, having a low operating noise level.
PCT/IB2016/053608 2015-06-18 2016-06-17 Rotary cutting device, particularly for cutting tobacco WO2017006198A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202015000025249 2015-06-18
ITUB2015U044766U ITUB201544766U1 (en) 2015-06-18 2015-06-18 ROTARY CUTTING EQUIPMENT, PARTICULARLY FOR TOUCHING THE TOBACCO.

Publications (1)

Publication Number Publication Date
WO2017006198A1 true WO2017006198A1 (en) 2017-01-12

Family

ID=57684593

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/053608 WO2017006198A1 (en) 2015-06-18 2016-06-17 Rotary cutting device, particularly for cutting tobacco

Country Status (2)

Country Link
IT (1) ITUB201544766U1 (en)
WO (1) WO2017006198A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112549093A (en) * 2020-11-25 2021-03-26 天津正丽科技有限公司 Automatic rotary cutting processing method for special-shaped diaphragm

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320898A (en) * 1940-12-23 1943-06-01 Richmond Maury Cigar bunch shaping machine and knife therefor
FR2320063A1 (en) * 1975-08-06 1977-03-04 Hauni Werke Koerber & Co Kg KNIFE FOR CUTTING ARTICLES IN THE SHAPE OF STICKS OR CONTINUOUS STICKS OF THE TOBACCO PROCESSING INDUSTRY
WO1987004905A1 (en) * 1986-02-13 1987-08-27 Comas S.R.L. Rotary cutting head, particularly for tobacco cutting machines
EP0584524A1 (en) * 1992-08-03 1994-03-02 COMAS S.p.A. A rotary cutter, particularly for shredding tobacco
DE102011106167A1 (en) * 2010-06-30 2012-01-05 Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. Machine for forming partial pieces made of hand-rolled tobaccos for manufacturing hand-rolled cigarettes, has metering unit testing whether weight of partial pieces corresponds to predetermined weight reference value

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320898A (en) * 1940-12-23 1943-06-01 Richmond Maury Cigar bunch shaping machine and knife therefor
FR2320063A1 (en) * 1975-08-06 1977-03-04 Hauni Werke Koerber & Co Kg KNIFE FOR CUTTING ARTICLES IN THE SHAPE OF STICKS OR CONTINUOUS STICKS OF THE TOBACCO PROCESSING INDUSTRY
WO1987004905A1 (en) * 1986-02-13 1987-08-27 Comas S.R.L. Rotary cutting head, particularly for tobacco cutting machines
EP0584524A1 (en) * 1992-08-03 1994-03-02 COMAS S.p.A. A rotary cutter, particularly for shredding tobacco
DE102011106167A1 (en) * 2010-06-30 2012-01-05 Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. Machine for forming partial pieces made of hand-rolled tobaccos for manufacturing hand-rolled cigarettes, has metering unit testing whether weight of partial pieces corresponds to predetermined weight reference value

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112549093A (en) * 2020-11-25 2021-03-26 天津正丽科技有限公司 Automatic rotary cutting processing method for special-shaped diaphragm

Also Published As

Publication number Publication date
ITUB201544766U1 (en) 2016-12-18

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