EP0526500A1 - Procede de controle de la qualite de la coupe par une machine a decouper du papier, du carton ou similaires, et machine a decouper. - Google Patents

Procede de controle de la qualite de la coupe par une machine a decouper du papier, du carton ou similaires, et machine a decouper.

Info

Publication number
EP0526500A1
EP0526500A1 EP91907951A EP91907951A EP0526500A1 EP 0526500 A1 EP0526500 A1 EP 0526500A1 EP 91907951 A EP91907951 A EP 91907951A EP 91907951 A EP91907951 A EP 91907951A EP 0526500 A1 EP0526500 A1 EP 0526500A1
Authority
EP
European Patent Office
Prior art keywords
cut
cutting
knife
stack
cutting 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
Application number
EP91907951A
Other languages
German (de)
English (en)
Other versions
EP0526500B1 (fr
Inventor
Claus Bokaemper
Arnold Heidenreich
Olaf Pfeiffer
Gerd Schmitz
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.)
WOHLENBERG VERTRIEBS- UND SERVICE GMBH
Original Assignee
AM WOHLENBERG GmbH
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 AM WOHLENBERG GmbH filed Critical AM WOHLENBERG GmbH
Publication of EP0526500A1 publication Critical patent/EP0526500A1/fr
Application granted granted Critical
Publication of EP0526500B1 publication Critical patent/EP0526500B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting

Definitions

  • the invention relates to a method for recording quality of a cutting machine for paper, cardboard or the like according to the preamble of claim 1.
  • paper, cardboard or the like is cut by cutting stacks of material to be cut by means of cutting machines, for example high-speed cutters or three-cutters with a smooth cut.
  • the cut quality essentially determines the quality and dimensional accuracy of the end product. If the cut quality is poor, the end product is usually no longer usable, which also means that all previous processing measures become obsolete and thus considerable damage occurs.
  • the cutting quality of a batch of material to be cut has been monitored from time to time by the operating personnel, and if the cutting quality has decreased, appropriate setting and maintenance measures have been carried out or maintenance measures have been carried out as a precaution at certain intervals or after a predetermined number of cuts.
  • the object of the invention is therefore to improve the method for recording the cutting quality of a cutting machine by automatically evaluating essential cutting parameters.
  • Cutting parameters which influence the course of the cut in various materials are the knife bevel angle, the knife sharpness, the insert height, the pressing pressure on the material to be cut 1, the fiber direction of the material to be cut and the cut length. Knife sharpness is a cutting parameter that changes in the course of processing cut material.
  • the sharpness of the knife steadily decreases due to wear, which both leads to an increase in the actuating force to be applied, which is necessary for severing the stack of cut material, and to a greater deflection of the cutting knife.
  • both the actuating force to be applied and the deflection form a criterion for the knife sharpness and can be automatically evaluated individually or in combination in order to assess the cutting quality.
  • the actuating force is preferably detected as an elongation or compression on an actuating rod.
  • the deflection can expediently be detected as a surface expansion on the surface of the cutting knife or the knife holder.
  • the value that occurs after touchdown and before cutting can be compared with a target value that depends on the stack height and the type of material to be cut.
  • the value measured at this point in time after compacting the stack of cut material represents the actuating force that must be applied to overcome the resistance to the cut material.
  • a sharp chisel knife taking into account the stack height and the type of material to be cut, there is a nominal resistance that corresponds to a tolerance Allowance to be used as setpoint. If the actual value deviates from the target value, this fact suggests an incorrect cutting parameter, in particular a diminishing knife sharpness.
  • a knife change signal is preferably triggered when the setpoint is exceeded.
  • This signal can indicate to the operating personnel optically or acoustically that a knife is due to be changed or can also stop the cutting machine if the knife change is not carried out after a warning time.
  • the temporal course of the value that occurs after touchdown can be compared with a target course that is dependent on the stack height and the type of material to be cut.
  • the course of the actuation force over time provides information about the elasticity of the visual tissue. Too high elasticity can lead to the cutting knife wedging or entrainment of the upper layers of the material to be cut, which can result in an oblique cut. If the time course of the value is shallower than the target course, the pressure on the stack of material to be cut is preferably increased or an application height reduction signal is triggered.
  • the elasticity of the material to be sliced can be changed automatically or manually to the value which ensures good cutting quality.
  • the value that occurs after touchdown and before cutting is compared with a target value that depends on the stack height and the type of material to be cut.
  • the pressing pressure on the stack of material to be cut can be reduced or, after the pressing pressure has been reduced, an insert height can be reduced. reduction signal or a knife change signal can be triggered after the height of use has been reduced.
  • the invention further relates to a cutting machine for paper, cardboard or the like according to the preamble of claim 10.
  • This object is achieved in a cutting machine according to the preamble of claim 10 by the measures specified in the characterizing part.
  • the invention makes use of the fact that the sharpness of the knife, as an essential cutting parameter, steadily decreases due to wear and both to increase the bringing actuating force, which is necessary for severing the cutting guide, as well as leading to a greater deflection of the cutting knife.
  • a size for assessing the cutting quality can be obtained by sensors which detect the actuating force to be applied or the deflection of the cutting knife or its knife holder.
  • An evaluation of the measured values of only one of the two sensors is sufficient.
  • the measured values of both sensors can also be evaluated together. In the latter case, an evaluation of further cutting parameters, such as knife bevel angle, insert height or pressing pressure on the stack of material to be cut, is then also made possible.
  • the actuation force sensor is arranged on an actuation rod.
  • the bending sensor is expediently arranged on the surface of the cutting knife or the knife holder, preferably in the central region of the cutting knife or the knife holder.
  • the sensors are designed as strain gauges.
  • Strain gauges have already proven to be very robust and reliable sensors, which also allow conclusions to be drawn about tensile or compressive forces via the material elongation.
  • the small size of strain gauges and their lack of impairment of the cutting function have proven particularly advantageous in the cutting machine according to the invention.
  • the detection and evaluation device is preferably connected to a signal transmitter.
  • a knife change signal can be triggered as soon as the value of the actuating force that occurs after touchdown and before severing exceeds a setpoint value that depends on the stack height and the type of material to be cut.
  • the knife change signal can be indicated optically and / or acoustically or even stop the cutting machine after a certain warning period.
  • the detection and evaluation device can be connected to a baling pressure control device.
  • the pressure on the stack of material to be cut can be increased automatically as soon as the actuating force is evaluated, the temporal course of the value of the actuating force occurring after placement has a flatter temporal course than a target value dependent on the stack height and the type of material to be cut ⁇ has run.
  • Such a course indicates a spring of an elastic material to be cut, which can be automatically removed by increasing the pressing pressure.
  • This measure can be successful if, when evaluating the deflection, the value of the deflection that occurs after touchdown and before severing exceeds a setpoint value that depends on the stack height and the type of material to be cut. The success of this measure can be seen from the fact that the measured deflection is then lower.
  • a detection height reduction signal can be triggered by the detection and evaluation device by means of the signal transmitter.
  • the use height of the following stacks of material to be cut can be reduced manually or automatically. If this has been the cause of excessive deflection, the deflection will then be less.
  • the detection and evaluation device can finally use the A knife change signal can be triggered by the signal generator. There then only remains a poor knife sharpness as an insufficient cutting parameter, which can be eliminated by changing the knife.
  • Fig. 1 is a diagram with a
  • FIG. 2 is a diagram with a
  • FIG. 3 is a plan view of an in one
  • Cutting knife and Fig. 4 shows a cross section through the
  • Fig. 1 shows a diagram with a cutting force, as it is in a cutting machine, e.g. one
  • the cutting process is triggered before the time A in FIG. 1. Within the period from the triggering time to the time A, the material to be cut is compacted by means of a pressing device.
  • the drive device of the cutting knife is then actuated.
  • the cutting knife then moves from its starting position towards the stack of material to be cut.
  • the knife chamfer touches the stack of material to be cut.
  • the material to be cut is now deformed and compacted in the area of the knife action.
  • the cutting force overcomes the resistance of the material to be cut and the actual cutting process beginning.
  • time D After cutting through the last layer, time D has been reached.
  • the increase in force in the area between the times D and E is caused by the penetration of the knife bevel into a cutting bar, which is made of soft material and is enclosed in the cutting base in the cutting area.
  • the maximum force at time E results from the depth of penetration of the knife chamfer into the cutting bar.
  • the cutting knife has reached its lower reversal point and returns to tent point G in its starting position. If the course of the cutting force is continuously recorded with an initially sharp cutting knife while the cutting parameters are otherwise the same, the cutting force gradually increases at time C. A value can now be determined at which the cut quality is just sufficient and this value can be used as a setpoint for later comparison measurements. Exceeding the setpoint then indicates insufficient knife sharpness and can be output as a knife change signal.
  • Another parameter can be read from the curve, namely the pressing force on the stack of material to be cut. If the pressing force is set correctly, this results in a pre-compression of the stack of material to be cut and consequently a curve shape between times B and C with a characteristic steep course. This curve shape can also be saved as a setpoint.
  • a deviation from this curve shape indicates springs of an elastic material to be cut.
  • a correction signal can be obtained by comparison with the target value, with which the pressing pressure on the stack of material to be cut is automatically increased or, if that is not an improvement yields, the bet size can be reduced automatically or manually.
  • FIG. 2 shows a diagram with a deflection curve.
  • the knife holder bend is shown, plotted over a cutting path related to an insert height of 100%.
  • Below the graphic is a table with cutting parameters for curves A to E.
  • a bend can be caused by supporting the knife holder or the cutting knife on the material to be cut. Since the material to be cut is highly compacted, the cutting knife gives way e.g. with waste cuts. In the case of separating cuts, however, there is less deviation due to the counterforce of the material to be cut in front of the cutting knife.
  • the deflection of the cutting knife or knife holder can, in addition to indicating defective knife sharpness, also control the pressing pressure on the stack of material to be cut or control the insert height. For this purpose, a setpoint for maximum deflection is determined in test series and the actual deflection is later compared with this setpoint during operation.
  • FIG. 3 shows a plan view of a cutting knife 12 located in a knife holder 10.
  • the cutting knife 12 with the knife holder 10 is part of a cutting cutter which imparts a vertical movement superimposed on it by a horizontal longitudinal movement during a cutting process.
  • An actuating rod 18, which is laterally connected to the knife holder, of an actuating device (not shown in more detail) specifies this movement.
  • An actuating force sensor 14 in the form of a strain gauge is arranged on the actuating rod 18. Electrical signals of the strain gauge are fed to a detection and evaluation device, not shown. With the actuating force sensor 14, the course of the cutting force, as it is exemplarily shown in FIG. 1, can be recorded via the expansion or compression of the actuating rod 18 and evaluated as explained above.
  • a bending sensor 16 is arranged on the cutting knife 12 or the knife holder 10. This bending sensor 16 detects the expansion or occurring on the surface of the cutting knife 12 or the knife holder 10 Upsetting the deflection of the cutting knife 12 or the knife holder 10. The bending sensor 16 is arranged in the central region of the cutting knife 12 or knife holder 10, where the deflection is greatest and the measurement accuracy is accordingly best.
  • the bending sensor 16 is also designed as a strain gauge and, like the actuating force sensor, is connected to the detection and evaluation device (not shown). With the bending sensor 16, the deflection, as it is exemplarily shown in FIG. 2, can be recorded and evaluated as explained above.
  • FIG. 4 shows a cross section through the representation according to FIG. 3 for the sake of completeness and reveals the local position of the bending sensor 16.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Making Paper Articles (AREA)
  • Paper (AREA)

Abstract

Un procédé permet de contrôler la qualité de la coupe effectuée par une machine à découper du papier, du carton ou similaires. La machine à découper comprend une lame tranchante (12) en forme de coin retenue dans un porte-lame (10) qui permet de sectionner une pile de produits à découper. Afin d'améliorer le procédé par évaluation automatique de paramètres essentiels de la coupe, la force requise pour sectionner la pile de produits à découper à appliquer une fois que la lame tranchante est posée sur la pile de produits à découper et/ou la flexion s'exerçant sur la lame tranchante (12) ou sur le porte-lame (10) sont détectées et évaluées.
EP91907951A 1990-04-26 1991-04-24 Procede de controle de la qualite de la coupe par une machine a decouper du papier, du carton ou similaires, et machine a decouper Expired - Lifetime EP0526500B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4013906A DE4013906C2 (de) 1990-04-26 1990-04-26 Verfahren zur Schnittqualitätserfassung einer Schneidmaschine für Papier, Pappe oder dergleichen sowie Schneidmaschine
DE4013906 1990-04-26
PCT/DE1991/000355 WO1991016180A1 (fr) 1990-04-26 1991-04-24 Procede de controle de la qualite de la coupe par une machine a decouper du papier, du carton ou similaires, et machine a decouper

Publications (2)

Publication Number Publication Date
EP0526500A1 true EP0526500A1 (fr) 1993-02-10
EP0526500B1 EP0526500B1 (fr) 1995-09-13

Family

ID=6405472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91907951A Expired - Lifetime EP0526500B1 (fr) 1990-04-26 1991-04-24 Procede de controle de la qualite de la coupe par une machine a decouper du papier, du carton ou similaires, et machine a decouper

Country Status (5)

Country Link
EP (1) EP0526500B1 (fr)
JP (1) JPH05506190A (fr)
AT (1) ATE127718T1 (fr)
DE (2) DE4013906C2 (fr)
WO (1) WO1991016180A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19502300A1 (de) * 1995-01-26 1996-08-01 Mohr Adolf Maschf Vorrichtung zum Schneiden von blättrigem Gut
DE202009005394U1 (de) 2009-04-08 2009-07-02 Müller Martini Buchtechnologie GmbH Fliess-Schneider mit Vorrichtung zur Messung der Schnittkräfte beim Schneiden von Papier, Pappe o.dgl.
DE102009033717B4 (de) * 2009-07-13 2014-04-03 Hochschule für Technik und Wirtschaft Dresden Vorrichtung und Verfahren zur Bestimmung der Schärfe einer Schneidkante von Schneidwerkzeugen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54141472A (en) * 1978-04-26 1979-11-02 Fanuc Ltd System for detecting tool abrasion
US4331050A (en) * 1978-10-03 1982-05-25 Computerized Cutters Ltd. Control for paper cutting apparatus
ES498824A0 (es) * 1981-01-26 1983-05-01 Investronica Sa Sistema mejorado para corregir flexiones de la cuchilla en una maquina automatica de corte
US4564911A (en) * 1983-04-25 1986-01-14 Eaton Corporation Method of monitoring a cutting tool by recognizing a sensed deviation in a mathematically smoothed function of force
DE3532328A1 (de) * 1985-09-11 1987-03-19 Degussa Dehnungsmessstreifen
SE458965B (sv) * 1987-10-13 1989-05-22 Sandvik Ab Kraftgivare foer en verkygsmaskin jaemte en metod att avkaenna krafter som uppstaar vid bearbetning av ett arbetsstycke i en verktygsmaskin

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9116180A1 *

Also Published As

Publication number Publication date
DE59106485D1 (de) 1995-10-19
WO1991016180A1 (fr) 1991-10-31
DE4013906C2 (de) 1995-05-18
ATE127718T1 (de) 1995-09-15
DE4013906A1 (de) 1991-11-07
JPH05506190A (ja) 1993-09-16
EP0526500B1 (fr) 1995-09-13

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