EP3311965A1 - Cutting-off machine for the cutting of logs of sheet material and relative cutting method - Google Patents
Cutting-off machine for the cutting of logs of sheet material and relative cutting method Download PDFInfo
- Publication number
- EP3311965A1 EP3311965A1 EP17195028.0A EP17195028A EP3311965A1 EP 3311965 A1 EP3311965 A1 EP 3311965A1 EP 17195028 A EP17195028 A EP 17195028A EP 3311965 A1 EP3311965 A1 EP 3311965A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- logs
- blade
- blades
- machine
- 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
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 7
- 238000002604 ultrasonography Methods 0.000 claims description 13
- 238000013021 overheating Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- B26D1/14—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 circular cutting member, e.g. disc cutter
- B26D1/157—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 circular cutting member, e.g. disc cutter rotating about a movable axis
- B26D1/16—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 circular cutting member, e.g. disc cutter rotating about a movable axis mounted on a movable arm or the like
-
- 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
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/16—Cutting rods or tubes transversely
-
- 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
- B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
-
- 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
- B26D2210/00—Machines or methods used for cutting special materials
- B26D2210/11—Machines or methods used for cutting special materials for cutting web rolls
Definitions
- the present invention relates in general to the production of rolls of sheet material and more particularly to a cutting-off machine and a method for the cutting of logs or sticks of sheet material, in particular paper.
- Cutting of the logs for forming rolls of smaller length is carried out with special cutting-off machines which have one or more metal or ceramic blades, of the disc type, which are made to rotate in an orbit around an axis in a cutting plane transverse to the direction of feeding of the log, or of the belt type, which are cyclically lowered onto the log to be cut.
- Another type of cutting-off machine provides for a series of fixed flat blades against which the logs are driven in a direction perpendicular to their axes, so as to be "sliced".
- a problem which reduces, even drastically, productivity of the cutting-off machines is overheating and the consequent deformation of the cutting blade. Since the cutting blade (in the case of belt disc blades) for performing the cutting of the log has to have a high rotation speed, during cutting, between the surface of the blade and that of the log to be cut, a high friction is generated which causes excessive overheating of the blade. Having reached a limit temperature, variable in accordance with the material and the shape of the disc of the blade, a relaxation and thermal expansion of the material of the disc occur which lead to deformation of the same disc.
- This deformation is due to the residual tensions induced in the disc of the blade in the phase of manufacture to make its surface take on the required planarity.
- Cutting-off machines are therefore equipped with systems aiming to lower the temperature of the blade or to control deformation thereof, as occurs in the patent EP 1609570 B1 of the same Applicant, or to ascertain the quality of the cut.
- Yet another object of the invention is that of providing a cutting-off machine of any one of the known types, which requires minimum modifications to achieve the abovementioned results.
- Substantially the cutting-off machine for the cutting of logs of sheet material comprises at least one cutting blade placed on a plane perpendicular to the axis of the logs, in order to perform transverse cuts over the same and produce rolls of smaller length with respect to the logs, said at least one cutting blade being associated with an ultrasonic device apt to generate a vibrating force on the blade.
- the ultrasonic converter 22 converts the electrical energy with frequency coming from the generator 20 into mechanical vibrations with high frequency, which are transferred to the sonotrode 23, which transmits the vibratory energy to the blade 11.
- FIGS 3 and 4 in which the same reference numerals introduced previously are used, illustrate an embodiment of the cutting-off machine wholly similar to that of Figures 1 and 2 .
- the cutting-off machine comprises two rectilinear flat blades 11 placed in diametrically opposed positions on a rotating support 12.
- the sonotrodes 23 are placed at the base of the blades 11.
- a plurality of lower drive belts 30 are provided, and a corresponding plurality of opposite upper drive belts 31, placed between the plurality of blades 11.
- a plurality of ultrasounds generators 20 are provided, connected by means of respective cables 21 to corresponding ultrasonic converters 22 and sonotrodes 23 placed at the bases of the respective blades 11.
Abstract
Description
- The present invention relates in general to the production of rolls of sheet material and more particularly to a cutting-off machine and a method for the cutting of logs or sticks of sheet material, in particular paper.
- Traditionally the manufacture of rolls of materials in sheet form, such as toilet paper, tissue paper, kitchen paper and similar products requires a plurality of process stages, comprising the unwinding of the sheet material from a roll of large diameter and rewinding, possibly on a core, to form logs or sticks of smaller diameter, cutting of the logs into rolls of the required length, on the basis of their end use, and packaging of the rolls.
- Cutting of the logs for forming rolls of smaller length is carried out with special cutting-off machines which have one or more metal or ceramic blades, of the disc type, which are made to rotate in an orbit around an axis in a cutting plane transverse to the direction of feeding of the log, or of the belt type, which are cyclically lowered onto the log to be cut.
- The logs are made to move forwards, normally in several parallel channels, towards the cutting blade, pushed by special pushers of a drive chain transferred on transfer wheels.
- Another type of cutting-off machine provides for a series of fixed flat blades against which the logs are driven in a direction perpendicular to their axes, so as to be "sliced".
- A problem which reduces, even drastically, productivity of the cutting-off machines is overheating and the consequent deformation of the cutting blade.
Since the cutting blade (in the case of belt disc blades) for performing the cutting of the log has to have a high rotation speed, during cutting, between the surface of the blade and that of the log to be cut, a high friction is generated which causes excessive overheating of the blade. Having reached a limit temperature, variable in accordance with the material and the shape of the disc of the blade, a relaxation and thermal expansion of the material of the disc occur which lead to deformation of the same disc. - This deformation is due to the residual tensions induced in the disc of the blade in the phase of manufacture to make its surface take on the required planarity.
- Consequently, having achieved a limit deformation of the blade, cutting of the logs has to be interrupted to allow cooling thereof, otherwise the excessively hot blade could deform further, becoming damaged or even broken, without mentioning the poor quality of the cut which is produced.
- Cutting-off machines are therefore equipped with systems aiming to lower the temperature of the blade or to control deformation thereof, as occurs in the
patent EP 1609570 B1 of the same Applicant, or to ascertain the quality of the cut. -
US 3 468 203 describes an apparatus for cutting a strip of flexible material by means of a knife which is pushed elastically against the belt while the latter advances continuously in order to be wound on a spindle. In order to improve the cutting effect means are provided to vibrate the knife in the range of sonic or ultrasonic frequencies. - There is therefore the need for a cutting-off machine which overcomes the limits of known machines.
The object of the invention is in fact that of providing such a cutting-off machine which eliminates, or at least reduces, the disadvantages of the cutting-off machines of the prior art. - More particularly an object of the invention is that of providing a cutting-off machine which allows cuts to be made of high quality, avoiding overheating and deformation of the cutting blade.
- Another object of the invention is that of providing such a cutting-off machine wherein the cutting blade does not require frequent sharpening.
- Yet another object of the invention is that of providing a cutting-off machine of any one of the known types, which requires minimum modifications to achieve the abovementioned results.
- These and other objects of the invention are achieved by the cutting-off machine according to the invention which has the features of the appended independent claim 1.
- Advantageous embodiments of the invention are disclosed by the dependent claims.
- Substantially the cutting-off machine for the cutting of logs of sheet material according to the invention comprises at least one cutting blade placed on a plane perpendicular to the axis of the logs, in order to perform transverse cuts over the same and produce rolls of smaller length with respect to the logs, said at least one cutting blade being associated with an ultrasonic device apt to generate a vibrating force on the blade.
- Further features of the invention will be made clearer by the following detailed description, referred to its embodiments purely by way of a non-limiting example and illustrated in the accompanying drawings, in which:
-
Figures 1 and2 are respectively a front view and a side view of a cutting-off machine with rotating disc blade mounted on orbiting arm, provided with a system of ultrasounds according to the invention applied at the centre of the blade; -
Figures 3 and4 are respectively a perspective view and front view of a cutting-off machine similar to that of the preceding drawings, with the ultrasounds applied on the edge of the blade; -
Figure 5 is a schematic perspective view of a cutting-off machine with two flat blades mounted on a rotating support, with ultrasounds applied at the bases of the blades; -
Figs. 6 ,7 and8 are, respectively, a schematic perspective view, a front view and a side view of a cutting-off machine with multiple flat blades for "passing" cutting of the logs, with ultrasounds applied at the bases of the blades. - Referring to the accompanying drawings, and for the time being to
Figures 1 and2 , a cutting-off machine for logs in sheet material, in particular paper, is shown schematically, denoted overall byreference numeral 10. - The cutting-off
machine 10 is of the standard type, with rotatingdisc blade 11, mounted on an orbitingarm 12 so that the blade performs an orbit in a cutting plane perpendicular to the axis of the logs, denoted byreference numeral 13. - According to the embodiment of
Figures 1 and2 , thelogs 13 are made to move forwards in the direction of their axes in order to be taken under thecutting blade 11. Obviously, several cutting blades can be provided. - The drawings also show schematically a
sharpening assembly 14 apt to sharpen periodically, and on indication of special sensors, theblade 11 as the latter wears out, if manufactured for example in metal. However, for what is stated here below, with the systems adopted by the invention, the wear of the blade is considerably reduced. Moreover, if special blades are used, for example in titanium, thesharpening assembly 14 can be absent. - According to the invention the cutting-off
machine 10 is equipped with an ultrasonic device for causing theblade 11 to vibrate and improve the cut, eliminating the disadvantages illustrated previously. - The ultrasonic device, in the schematic form shown, comprises a generator of
ultrasounds 20, connected by means of acable 21, to anultrasonic converter 22, coupled to asonotrode 23. - The
ultrasonic converter 22 converts the electrical energy with frequency coming from thegenerator 20 into mechanical vibrations with high frequency, which are transferred to thesonotrode 23, which transmits the vibratory energy to theblade 11. - In the embodiment of
Figures 1 and2 thesonotrode 23 is mounted on the axis X of theblade 11, so that the ultrasounds are applied at the centre of the blade. - The provision of the ultrasounds, which make the blade vibrate, allows a very precise cut of the
logs 13 to be made, avoiding overheating of the blade thanks to the reduced cutting force required by the vibration of the blade. The logs are not therefore deformed by the compression. -
Figures 3 and4 , in which the same reference numerals introduced previously are used, illustrate an embodiment of the cutting-off machine wholly similar to that ofFigures 1 and2 . - The only difference is that in this case the
ultrasonic converter 22 and thesonotrode 23 are applied in proximity of the edge of the blade. Therefore, the vibratory force of the ultrasounds acts directly on the edge of the blade. - According to the embodiment of
Figure 5 , the cutting-off machine comprises two rectilinearflat blades 11 placed in diametrically opposed positions on a rotatingsupport 12. - In this case the
sonotrodes 23 are placed at the base of theblades 11. - According to the embodiment of
Figures 6 ,7 and8 a plurality of fixedflat blades 11 are provided, against which thelogs 13 are made to move forwards in a direction perpendicular to their axes, for a so-called "passing" cut. - For the transport of the logs a plurality of
lower drive belts 30 are provided, and a corresponding plurality of oppositeupper drive belts 31, placed between the plurality ofblades 11. - In
Figures 6 and8 , two logs moving forwards towards thecutting blades 11 are shown between the opposite series ofbelts rolls 15, withside trims 16. - In this case a plurality of
ultrasounds generators 20 are provided, connected by means ofrespective cables 21 to correspondingultrasonic converters 22 andsonotrodes 23 placed at the bases of therespective blades 11. - From what has been disclosed the advantages appear clear of the invention which, combining an ultrasonic device with a cutting-off machine of logs of sheet material of any known type, allows an extremely precise cut to be obtained, eliminating the disadvantages of the prior art linked to the overheating and deformation of the cutting blade.
- Naturally the invention is not limited to the particular embodiments previously described and illustrated in the accompanying drawings, but numerous detailed changes may be made thereto, within the reach of the person skilled in the art, without thereby departing from the scope of the invention itself as defined by the appended claims.
Claims (10)
- Cutting-off machine (10) for cutting logs (13) of sheet material, comprising at least one cutting blade (11) placed on a plane perpendicular to the axis of the logs (13), in order to perform transverse cuts over the same and produce rolls (15) of smaller length than the logs, characterised in that said at least one cutting blade (11) is a rotating blade, with which is associated a sonotrode (23) of an ultrasonic device apt to generate a vibrating force on the blade.
- Cutting-off machine according to claim 1, wherein said rotating blade (11) is a disc carried by an orbiting arm, and said sonotrode (23) is placed on the axis (X) of the disc blade (11).
- Cutting-off machine according to claim 1, wherein said rotating blade (11) is a disc carried by an orbiting arm (12), and said sonotrode (23) is placed in proximity to the edge of said disc blade (13).
- Cutting-off machine according to claim 1, wherein said rotating blade (11) is constituted by rectilinear flat blades (11) diametrically opposed, carried by a rotating support (12), and said sonotrode (23) is placed in correspondence to the base of the corresponding blade.
- Cutting-off machine according to claim 1, characterised in that said ultrasonic device comprises an ultrasonic generator (20) linked by means of a cable (21) to an ultrasonic converter (22) and to said sonotrode (23) placed on the blade (11).
- Cutting-off machine (10) for cutting logs (13) of sheet material, comprising a plurality of cutting blades (11) placed on planes perpendicular to the axis of the logs (13), in order to perform transverse cuts over the same and produce rolls (15) of smaller length with respect to the logs,
wherein said blades are rectilinear fixed flat blades (11) at whose bases are placed respective sonotrodes (23) of an ultrasonic device apt to generate a vibrating force on the blades, apt to perform a "passing" cut of the logs. - Method for cutting logs (13) of sheet material by means of a cutting-off machine having at least one cutting blade (11) placed on a plane perpendicular to the axis of the logs, consisting in carrying said at least one blade into contact with said logs, or vice versa said logs into contact with said at least one blade to perform transverse cuts over the logs and to produce rolls (15) of smaller length than the logs, characterised in that said at least one cutting blade (11) is a rotating blade and ultrasounds are applied thereon during the cutting operation.
- Method according to claim 7, wherein said rotating blade (11) is a disc carried by an orbiting arm (12) and said ultrasounds are applied on the axis (X) of the disc or in proximity of its edge.
- Method according to claim 7, wherein said at least one rotating cutting blade (11) is constituted by rectilinear flat blades diametrically opposed and said ultrasounds are applied at the base of the respective blade.
- Method for cutting logs (13) of sheet material by means of a cutting-off machine having a plurality of fixed cutting blades (11) placed on planes perpendicular to the axis of the logs, consisting in carrying said logs into contact with said blades to perform transverse cuts over the logs and to produce rolls (15) of smaller length with respect to the logs, wherein the logs are made to move forwards against said fixed blades in a perpendicular direction to their axes for a "passing" cut of the logs and ultrasounds are applied to the blades during the cutting.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102016000104428A IT201600104428A1 (en) | 2016-10-18 | 2016-10-18 | CUTTING MACHINE FOR CUTTING LOGS OF MATERIAL IN SHEET AND ITS CUTTING METHOD |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3311965A1 true EP3311965A1 (en) | 2018-04-25 |
EP3311965B1 EP3311965B1 (en) | 2019-05-01 |
Family
ID=57960749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17195028.0A Active EP3311965B1 (en) | 2016-10-18 | 2017-10-05 | Cutting-off machine for the cutting of logs of sheet material and relative cutting method |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3311965B1 (en) |
IT (1) | IT201600104428A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202000016024A1 (en) * | 2020-07-02 | 2022-01-02 | Paper Converting Machine Company S P A | METHOD OF CONTROLLING THE PROCESS OF SHARPENING A CUTTING BLADE IN A CUT-OFF MACHINE |
EP3944925A1 (en) * | 2020-07-29 | 2022-02-02 | Paper Converting Machine Company S.p.A | System for controlling the quality of products in output from a cutting machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3468203A (en) * | 1966-04-15 | 1969-09-23 | Etudes De Machines Speciales | Knives |
EP1075910A1 (en) * | 1999-08-10 | 2001-02-14 | Fort James France | Machine for cutting paper logs |
US20160114494A1 (en) * | 2013-05-13 | 2016-04-28 | A O Schallinox Gmbh | Method for cutting a process material under the application of ultrasonic energy as well as cutting device |
-
2016
- 2016-10-18 IT IT102016000104428A patent/IT201600104428A1/en unknown
-
2017
- 2017-10-05 EP EP17195028.0A patent/EP3311965B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3468203A (en) * | 1966-04-15 | 1969-09-23 | Etudes De Machines Speciales | Knives |
EP1075910A1 (en) * | 1999-08-10 | 2001-02-14 | Fort James France | Machine for cutting paper logs |
US20160114494A1 (en) * | 2013-05-13 | 2016-04-28 | A O Schallinox Gmbh | Method for cutting a process material under the application of ultrasonic energy as well as cutting device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202000016024A1 (en) * | 2020-07-02 | 2022-01-02 | Paper Converting Machine Company S P A | METHOD OF CONTROLLING THE PROCESS OF SHARPENING A CUTTING BLADE IN A CUT-OFF MACHINE |
WO2022002763A1 (en) * | 2020-07-02 | 2022-01-06 | Paper Converting Machine Company S.P.A. | Control method for controlling the process of sharpening of a cutting blade in a cutting machine |
EP3944925A1 (en) * | 2020-07-29 | 2022-02-02 | Paper Converting Machine Company S.p.A | System for controlling the quality of products in output from a cutting machine |
WO2022023345A1 (en) * | 2020-07-29 | 2022-02-03 | Paper Converting Machine Company S.P.A. | System for controlling the quality of products in output from a cutting machine |
Also Published As
Publication number | Publication date |
---|---|
EP3311965B1 (en) | 2019-05-01 |
IT201600104428A1 (en) | 2018-04-18 |
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