EP0982104B1 - Method and apparatus for moving the circular cutter of a machine for cutting logs of paper and the like - Google Patents
Method and apparatus for moving the circular cutter of a machine for cutting logs of paper and the like Download PDFInfo
- Publication number
- EP0982104B1 EP0982104B1 EP19980830510 EP98830510A EP0982104B1 EP 0982104 B1 EP0982104 B1 EP 0982104B1 EP 19980830510 EP19980830510 EP 19980830510 EP 98830510 A EP98830510 A EP 98830510A EP 0982104 B1 EP0982104 B1 EP 0982104B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- saw
- support
- orbit
- rocking arm
- point
- 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.)
- Expired - Lifetime
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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
- 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
- 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
Definitions
- the present invention generally relates to paper converting machines, and more precisely it relates to a transversal cutting machine of the type having a rocking saw for logs of paper and the like for the production of rolls of toilet paper, all purpose and industrial rolls, stacks of napkins and the like.
- the invention relates to a method for driving a saw and causing it to follow a complex orbit.
- the invention relates to a drive apparatus of a saw that carries out such method.
- Transversal cutting machines are known for making rolls or stacks of paper, for example rolls of toilet paper, general purpose towels, napkins and the like, which are supplied with logs of paper wound upstream.
- one or more logs are placed on a bench for their stepped conveying. Then, the downstream ends of the logs pass in turn through a cutting off section and are held by a clamp device so that a rocking saw is driven through the paper for cutting off in succession the rolls or stacks. More precisely, before of each lowering motion of the saw onto the logs, the latter are pushed forward axially for a distance equal to the length of each final roll or stack. The logs are held only at the moment of the cut by means of a clamping device which allows their sliding in the stepped conveying as well.
- Means are provided for synchronising the stepped movement of the log and the moment in which the saw is raised between two consecutive cuts.
- most of machines are equipped with means for pushing the logs and means for rocking the saw support with independent motors, synchronised by programmable means.
- the existing machines have means for driving the saw that can be improved both inertially, and on the effectiveness of the cut and of the cutting time.
- additional complex means are provided, further to the components of the drive apparatus of the orbit.
- transversal cutting machine according to the present invention as defined in claim 1 comprising:
- the rocking frame comprises:
- the first rocking arm is made of two parts and means are provided for adjusting its length, whereby the orbit of the saw can be adjusted for recovering the wear of the saw.
- the length of the first rocking arm is adjustable for example by means of an electromechanical jack that adjusts the relative position of its parts.
- crank preferably, is made of two arms bent with respect to each other and integral to each other by means of a coupling that allows the adjustment of the angle thereof. In this way the adjustment of the angle changes the distance between the axes of the crank thus changing the cutting parameters.
- both the lengths of at least one of the two arms and the point of pivot of the first rocking arm at the drive shaft can be changed.
- the invention is also defined by a method according to claim 6.
- a transversal cutting machine comprises a base 1, capable of slidingly supporting a log of paper 2, for example toilet paper to cut off into rolls by means of a rocking saw 3, supported and driven by a drive apparatus 4 fixed to a frame 5.
- a base 1 capable of slidingly supporting a log of paper 2, for example toilet paper to cut off into rolls by means of a rocking saw 3, supported and driven by a drive apparatus 4 fixed to a frame 5.
- Saw 3 is shown in the position of top dead center of its orbit and, with dotted line, in the position of bottom dead center in which the saw has been completely driven into log 2. During the cut log 2 is held by a clamping device 6.
- the drive apparatus 4 for driving saw 3 comprises means for adjusting the orbit versus the wear of the saw after a sharpening and according to the different cutting conditions to which the machine must be adapted.
- the drive apparatus 4 comprises:
- the first rocking arm 14 is made of two parts 14a and 14b, which can slide with respect to each other operated by a electromechanical jack 18. In this way, the change of length can be carried out automatically after each sharpening step of saw 3 for compensating its reduction of diameter by adjusting the trajectory of the sharpened edge for continuing the cutting off of the logs into rolls.
- the first rocking arm 14, moreover, have portion 14a which comprises a plurality of linking housings 19 to the eccentric point 10a of drive shaft 10.
- portion 14a which comprises a plurality of linking housings 19 to the eccentric point 10a of drive shaft 10.
- crank mechanism 15 are variable, similarly to the change of length of first rocking arm 14, in order to adjust the orbit and then the cutting parameters.
- Circular saw 3 of the cutting off machine therefore, follows an orbit which is the composition of two plane motions, the former being given by the first rocking arm 14 to the first point 12a of support 12 and the latter being given by crank mechanism 15 to second point 12b of support 12.
- the former motion can be changed with continuity without stopping the machine for adjusting the trajectory of the sharpened edge of the saw after each sharpening thus allowing the continuation of the cut.
- Both motions moreover, can be changed stopping the machine for adjusting in a discrete way the orbit of saw 3 and the approaching speed between saw and log, as well as for adjusting the exit speed and the angle of the orbit of the saw throughout the log versus the different types and size of the material to cut.
Description
- The present invention generally relates to paper converting machines, and more precisely it relates to a transversal cutting machine of the type having a rocking saw for logs of paper and the like for the production of rolls of toilet paper, all purpose and industrial rolls, stacks of napkins and the like.
- In particular, the invention relates to a method for driving a saw and causing it to follow a complex orbit.
- Moreover, the invention relates to a drive apparatus of a saw that carries out such method.
- Transversal cutting machines are known for making rolls or stacks of paper, for example rolls of toilet paper, general purpose towels, napkins and the like, which are supplied with logs of paper wound upstream.
- In said machines one or more logs are placed on a bench for their stepped conveying. Then, the downstream ends of the logs pass in turn through a cutting off section and are held by a clamp device so that a rocking saw is driven through the paper for cutting off in succession the rolls or stacks. More precisely, before of each lowering motion of the saw onto the logs, the latter are pushed forward axially for a distance equal to the length of each final roll or stack. The logs are held only at the moment of the cut by means of a clamping device which allows their sliding in the stepped conveying as well.
- Means are provided for synchronising the stepped movement of the log and the moment in which the saw is raised between two consecutive cuts. In particular, most of machines are equipped with means for pushing the logs and means for rocking the saw support with independent motors, synchronised by programmable means.
- Many types of systems for driving the saw are known, the latter normally being a quickly rotating circular saw, whose axis of rotation has an oscillating or a reciprocating motion.
- Important parameters for the cut in case of a rocking saw are:
- the approaching speed of the saw onto the log;
- the exit speed of the saw from the log;
- the direction and the angle of the path that the saw follows when going through the log during the cutting step.
- In case of circular orbit, for adjusting the approaching or exit speed, the change of the arm of the orbit with a longer or shorter one is possible, but this way also the angle changes. This has the consequence that machines designed for being used at certain working conditions cannot work in a correct way if are adapted for working in substantially different conditions.
- For carrying out the sharpening of the saw, moreover, on some types of machine sharpening means are provided directly on board. The wear of the saw, in fact, is quick even if it varies versus the working conditions, whereby the life of the saw is normally comprised between several days and several weeks. Therefore, since the orbit of the saw must be adjusted quite often versus its wear after sharpening, this has the consequence of frequent stops of the machine for carrying out the adjustment.
- The existing machines, however, have means for driving the saw that can be improved both inertially, and on the effectiveness of the cut and of the cutting time. In particular, for the adjustment of the orbit of the saw after sharpening additional complex means are provided, further to the components of the drive apparatus of the orbit.
- It is an object of the present invention to provide a transversal cutting machine, of the type above described, in which the rocking saw is driven by a drive apparatus that allows to overcome the limits and the drawbacks of the existing machines and in particular allows the adjustment of the trajectory of the saw after a sharpening step in an easy and effective way.
- It is another object of the present invention to provide a transversal cutting machine in which it is possible to adjust the approaching speed and the exit speed of the saw with respect to the log, thus obtaining better cutting quality of the log core even at higher speed for each different type of product to cut off.
- It is a further object of the invention to provide a method for driving the saw that allows the adjustment of the orbit thereof at the choice of the user.
- These and other objects are achieved by the transversal cutting machine according to the present invention as defined in
claim 1 comprising: - a circular saw;
- a support which pivotally holds the saw along with means of transmission to the saw of the rotational motion;
- a drive apparatus for driving the support that lowers cyclically the saw onto the logs and cuts them off into rolls;
- a drive shaft that carries the drive apparatus.
- Preferably, the rocking frame comprises:
- a first rocking arm having ends pivoted respectively at a first point of the support and at a first eccentric point of the drive shaft;
- a crank mechanism comprising a second rocking arm, pivoted at a second point of the support, and a crank, pivoted at a second eccentric point of the drive shaft.
- Preferably, the first rocking arm is made of two parts and means are provided for adjusting its length, whereby the orbit of the saw can be adjusted for recovering the wear of the saw.
- The length of the first rocking arm is adjustable for example by means of an electromechanical jack that adjusts the relative position of its parts.
- Also the crank, preferably, is made of two arms bent with respect to each other and integral to each other by means of a coupling that allows the adjustment of the angle thereof. In this way the adjustment of the angle changes the distance between the axes of the crank thus changing the cutting parameters. Advantageously, also both the lengths of at least one of the two arms and the point of pivot of the first rocking arm at the drive shaft can be changed.
- The invention is also defined by a method according to claim 6.
- Further characteristics and/or advantages of the present invention will be made clearer with the following, but not limitative, exemplifying description of several exemplifying embodiments thereof, with reference to the attached drawings wherein:
- figure 1 shows a cross sectional view of a transversal cutting machine according to the present invention with detail of the drive apparatus of the saw;
- figure 2 shows a longitudinal sectional view of the drive apparatus of figure 1.
- figures from 3 to 6 show four different positions of the drive apparatus of figure 1 and of the saw with respect to the log to cut.
- With reference to figure 1, a transversal cutting machine according to the present invention comprises a
base 1, capable of slidingly supporting a log ofpaper 2, for example toilet paper to cut off into rolls by means of arocking saw 3, supported and driven by adrive apparatus 4 fixed to aframe 5. For a clearer comprehension of figure 1 the view of the front wall offrame 5 has been omitted. -
Saw 3 is shown in the position of top dead center of its orbit and, with dotted line, in the position of bottom dead center in which the saw has been completely driven intolog 2. During thecut log 2 is held by a clamping device 6. - According to the invention, the
drive apparatus 4 for drivingsaw 3 comprises means for adjusting the orbit versus the wear of the saw after a sharpening and according to the different cutting conditions to which the machine must be adapted. - In particular, the
drive apparatus 4 comprises: - a
drive shaft 10 operated by means of a motor and a transmission linkage 9 (fig. 2); - a
support 12 withbeams 13 which pivotally support thesaw 3 and atransmission linkage 11 of the rotational motion (fig. 2); - a first rocking
arm 14 having adjustable length with ends pivoted respectively in afirst point 12a of the support and in a firsteccentric point 10a of thedrive shaft 10; - a
crank mechanism 15 comprising asecond rocking arm 16 and acrank 17 formed by twolevers crank 17 is pivoted at asecond point 12b of thesupport 12, whilst thesecond rocking arm 16 is pivoted at asecond point 10b of thedrive shaft 10, thepoints points first rocking arm 14. - The first rocking
arm 14 is made of twoparts electromechanical jack 18. In this way, the change of length can be carried out automatically after each sharpening step ofsaw 3 for compensating its reduction of diameter by adjusting the trajectory of the sharpened edge for continuing the cutting off of the logs into rolls. - The
first rocking arm 14, moreover, haveportion 14a which comprises a plurality of linkinghousings 19 to theeccentric point 10a ofdrive shaft 10. In this way, the length of rockingarm 14, further to being automatically subject to small differences after each sharpening step, can be changed in a discrete way for adjusting the orbit of the saw to new cutting parameters. - Further adjustments of the orbit of the
saw 3 can be obtained changing the angle betweenlevers lever crank mechanism 15 are variable, similarly to the change of length of first rockingarm 14, in order to adjust the orbit and then the cutting parameters. - It is also possible to displace
eccentric point 10b ofdrive shaft 10 thus allowing further differences of orbit. - Circular saw 3 of the cutting off machine, therefore, follows an orbit which is the composition of two plane motions, the former being given by the
first rocking arm 14 to thefirst point 12a ofsupport 12 and the latter being given bycrank mechanism 15 tosecond point 12b ofsupport 12. - The former motion can be changed with continuity without stopping the machine for adjusting the trajectory of the sharpened edge of the saw after each sharpening thus allowing the continuation of the cut. Both motions, moreover, can be changed stopping the machine for adjusting in a discrete way the orbit of
saw 3 and the approaching speed between saw and log, as well as for adjusting the exit speed and the angle of the orbit of the saw throughout the log versus the different types and size of the material to cut. - Therefore, different cutting conditions can be obtained with improved quality of the final product and higher top speed than the transversal existing cutting machines.
- The foregoing description of a specific embodiment will so fully reveal the invention,which is defined by the claims, according to the conceptual point of view, so that others, by applying current knowledge, will be able to modify and/or adapt for various applications such an embodiment without further research and without parting from the invention. The means and the materials to realise the different functions described herein could have a different nature without, for this reason, departing from the field of the invention.
Claims (8)
- Transversal cutting machine of logs of paper and the like, comprisinga saw (3),a support (12) that pivotally carries said saw (3) along with transmission linkages of the rotational motion to said saw (3),a drive apparatus for driving said support (12) that lowers cyclically said saw (3) onto said logs (2) cutting them off into portions,
- Transversal cutting machine according to claim 1, wherein said drive apparatus comprises:a drive shaft (10);a first rocking arm (14) having ends pivoted respectively at a first point (12a) of said support (12) and at a first eccentric point (10a) of said drive shaft (10);a crank mechanism (15) comprising a crank (17), pivoted at a second point (12b) of the support (12), and a second rocking arm (16), pivoted at a second point (10b) of said drive shaft (10).
- Transversal cutting machine according to claim 2, wherein said first rocking arm (14) is made of at least two parts (14a, 14b) integral to each other, means being provided for allowing said parts to slide or to be locked with respect to each other for the change of length of said first rocking arm (14).
- Transversal cutting machine according to claim 3, wherein said means that allow said parts (14a, 14b) of said first rocking arm (14) to slide or to be locked with respect to each other comprise an electromechanical jack (18) which carries out said change of length after each sharpening of said saw (3) for compensating its reduction of diameter.
- Transversal cutting machine according to claim 2 wherein said crank (17) of said crank mechanism (15) is formed by two levers (17a, 17b) bent with respect to each other, means being provided for adjusting the angle between said levers, whereby the length of said crank is adjustable.
- Method for cutting off logs of paper and the like into portions, comprising the steps of:disposition of a saw rotating on a support;rocking of said support according to a orbit, said orbit passing through said log to cut off
- Method for cutting off according to claim 6, wherein the stroke given to said distinct points is adjustable and said orbit is changeable after each sharpening of said saw.
- Method for cutting off according to claim 6, wherein the stroke of a first and a second point of said support is given respectively by means of a first rocking arm having adjustable length and a crank mechanism having variable shape.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69814853T DE69814853T2 (en) | 1998-08-21 | 1998-08-21 | Method and device for moving the circular knife of a machine for cutting paper rolls or the like |
EP19980830510 EP0982104B1 (en) | 1998-08-21 | 1998-08-21 | Method and apparatus for moving the circular cutter of a machine for cutting logs of paper and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19980830510 EP0982104B1 (en) | 1998-08-21 | 1998-08-21 | Method and apparatus for moving the circular cutter of a machine for cutting logs of paper and the like |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0982104A2 EP0982104A2 (en) | 2000-03-01 |
EP0982104A3 EP0982104A3 (en) | 2000-03-15 |
EP0982104B1 true EP0982104B1 (en) | 2003-05-21 |
Family
ID=8236768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980830510 Expired - Lifetime EP0982104B1 (en) | 1998-08-21 | 1998-08-21 | Method and apparatus for moving the circular cutter of a machine for cutting logs of paper and the like |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0982104B1 (en) |
DE (1) | DE69814853T2 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI981573A1 (en) * | 1998-07-09 | 2000-01-09 | Italconverting Srl | CUTTING DEVICE OF ROLLS OF SHEET MATERIAL |
CN100506449C (en) | 2003-06-05 | 2009-07-01 | 托德·R·莫里森 | Roll cutting apparatus |
EP1970175B1 (en) * | 2004-03-31 | 2014-01-15 | M T C - Macchine Trasformazione Carta S.r.l. | Clamping method for transversal cutting machines of logs of paper |
ITFI20060338A1 (en) | 2006-12-27 | 2008-06-28 | Futura Spa | DEVICE AND METHOD FOR THE COOLING OF LOGS CUTTING MEANS IN CUTTING MACHINES. |
ITRN20120058A1 (en) * | 2012-12-20 | 2014-06-21 | Sica Spa | APPARATUS AND METHOD OF CUTTING TUBES IN THERMOPLASTIC MATERIAL. |
CN103640041B (en) | 2013-09-09 | 2016-02-10 | 宇宙纸巾技术有限公司 | Dise knife cutter sweep |
CN104002324B (en) * | 2014-01-13 | 2016-08-17 | 浙江鼎业机械设备有限公司 | A kind of sanitary paper towel cutting machine |
PL2921268T3 (en) * | 2014-03-19 | 2017-06-30 | Universal Tissue Technology S.R.L. | Log saw machine |
CN104044168B (en) * | 2014-06-20 | 2016-03-09 | 浙江鹤翔印刷机械有限公司 | Paper web breaker |
CN107394560A (en) * | 2017-06-19 | 2017-11-24 | 昆山思柯马自动化设备有限公司 | The quick cutting mechanism of plug wire terminal |
CN109227662A (en) * | 2018-09-24 | 2019-01-18 | 安徽秋华建筑工程有限公司 | A kind of rock-wool heat insulation plate with can uniform stripping and slicing cutter device |
CN117565125B (en) * | 2024-01-15 | 2024-03-12 | 烟台誉衡管业有限公司 | MPP power tube cutting device for power construction and use method thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2855733A (en) * | 1956-12-28 | 1958-10-14 | American Chain & Cable Co | Abrasive cutting wheel method |
US3540338A (en) * | 1968-11-21 | 1970-11-17 | James Mcewan Inc | Cutoff machine |
DE2012361C2 (en) * | 1970-03-16 | 1972-01-13 | Hobema Maschinenfabrik Hermann H. Raths, 4000 Düsseldorf | Circular knife cutting machine |
-
1998
- 1998-08-21 DE DE69814853T patent/DE69814853T2/en not_active Expired - Fee Related
- 1998-08-21 EP EP19980830510 patent/EP0982104B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0982104A2 (en) | 2000-03-01 |
DE69814853T2 (en) | 2004-05-06 |
EP0982104A3 (en) | 2000-03-15 |
DE69814853D1 (en) | 2003-06-26 |
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