EP1787772A1 - Verfahren und vorrichtung zum abschneiden eines streifenförmigen papierglieds und steuerung der vorrichtung - Google Patents

Verfahren und vorrichtung zum abschneiden eines streifenförmigen papierglieds und steuerung der vorrichtung Download PDF

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Publication number
EP1787772A1
EP1787772A1 EP05736741A EP05736741A EP1787772A1 EP 1787772 A1 EP1787772 A1 EP 1787772A1 EP 05736741 A EP05736741 A EP 05736741A EP 05736741 A EP05736741 A EP 05736741A EP 1787772 A1 EP1787772 A1 EP 1787772A1
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EP
European Patent Office
Prior art keywords
knife
following
cut
gear
driving motor
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
EP05736741A
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English (en)
French (fr)
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EP1787772A4 (de
EP1787772B1 (de
Inventor
Hiroshi <MITSUBISHI HEAVY IND. LTD. ISHIBUCHI
Satoshi Mitsubishi Heavy Industries Ltd. MATSUDA
Kuniaki Ryomei Engineering Co. Ltd. WAKUSAWA
Katsuaki Ryomei Engineering Co. Ltd. TAKASAKI
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.)
Mitsubishi Heavy Industries Machinery Systems Co Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Mitsubishi Heavy Industries Printing and Packaging Machinery Ltd
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Application filed by Mitsubishi Heavy Industries Ltd, Mitsubishi Heavy Industries Printing and Packaging Machinery Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP1787772A1 publication Critical patent/EP1787772A1/de
Publication of EP1787772A4 publication Critical patent/EP1787772A4/de
Application granted granted Critical
Publication of EP1787772B1 publication Critical patent/EP1787772B1/de
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    • 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
    • B26D1/56—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/62—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder
    • B26D1/626—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder for thin material, e.g. for sheets, strips 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
    • 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
    • B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed

Definitions

  • the present invention relates to a cut off method and apparatus for band-like paper, such as a corrugated fiberboard web, and a control apparatus for the same in a corrugating machine which manufactures corrugated fiberboard sheets, etc.
  • the cut off apparatus includes: an upper knife cylinder 53 to which an upper knife 55 and split gears 8a and 8b are attached; a lower knife cylinder 54 to which a lower knife 56, which cuts a corrugated fiberboard web in cooperation with the upper knife 55, and a lower gear 9 which has a meshing engagement with the split gears 8a and 8b are attached; a main drive motor 51 and an auxiliary drive motor 50 which rotationally drive the knife cylinders 53 and 54; and a controller 52 which controls the drive motors 51 and 50.
  • the controller 52 in the above patent document 1 only performs torque control in such a manner that a pressing force is generated so that the upper knife 55 is pressed against the lower knife 56.
  • the rated power capacities (size) of the upper motor and the lower motor are different, so that the number of types of components including a control device is increased.
  • a cut off method for a cut off apparatus as set forth in claim 1 is characterized in that which apparatus includes: a preceding knife cylinder on whose peripheral surface a preceding helical knife is provided; a following knife cylinder on whose peripheral surface a following helical knife, which cuts off band-like paper in cooperation with the preceding knife, is provided; a preceding knife driving motor which rotationally drives the preceding knife cylinder; a following knife driving motor which rotationally drives the following knife cylinder; and a cut off control device which individually controls the preceding knife driving motor and the following knife driving motor, wherein the method comprises: giving, when the band-like paper is cut, the preceding knife and the following knife a specified amount of torque in the direction in which the preceding knife and the following knife are pressed against each other, by means of the preceding knife driving motor and the following knife driving motor.
  • a cut off method as set forth in claim 2 is characterized in that the value of the torque given by means of the preceding knife driving motor is the same as the value of the torque given by means of the following knife driving motor.
  • a cut off control device for band-like paper as set forth in claim 3, which device controls a preceding knife driving motor for rotationally driving a preceding knife cylinder on whose peripheral surface a preceding helical knife is provided and also a following knife driving motor for rotationally driving a following knife cylinder on whose peripheral surface a following helical knife is provided, is characterized in that the device comprises: a speed pattern generator, to which a paper feeding speed of the band-like paper and the sheet length to be cut off is input, for generating rotational speed patterns of the preceding knife driving motor and the following knife driving motor based on the input paper feeding speed and the input sheet length to be cut off and for outputting a speed instruction value; a comparator which compares the speed instruction value from the speed pattern generator with a detected speed of the preceding knife driving motor or the following knife
  • a cut off control device as set forth in claim 4 is characterized in that, in the device as set forth in claim 3, the cutting torque computed by the cutting torque computing unit has a cutting torque value necessary for cutting off the band-like paper, the cutting torque value being based on the basis weight and the paper feeding speed input.
  • a cut off control device as set forth in claim 5 is characterized in that, in the device as set forth in claim 3 or claim 4, the cutting torque computed by the cutting torque computing unit is large enough to resist a cut-off reactive force added from the band-like paper to the preceding and following knives, and also to give an appropriate contact force to the preceding and following knives.
  • a cut off control device as set forth in claim 6 is characterized in that, in the device as set forth in any one of claim 3 through claim 5, the to-be-given torque pattern generated by the to-be-given torque pattern generator is a pattern having a rectangular shape, a trapezoidal shape, or a polygonal shape.
  • a cut off control device as set forth in claim 7 is characterized in that, in the device as set forth in any one of claim 3 through claim 6, the to-be-given torque pattern generator changes the pattern of the to-be-given torque depending on the paper feeding speed.
  • a cut off control device as set forth in claim 8 is characterized in that, in the device as set forth in any one of claim 3 through claim 7, the to-be-given torque pattern generator generates an identical to-be-given torque pattern for the preceding knife driving motor and the following knife driving motor.
  • a cut off control device as set forth in claim 9 is characterized in that, in the device as set forth in any one of claim 3 through claim 8, the cut off control device is connected to a production management device including an input unit for inputting thereto the basis weight of the band-like paper and the sheet length to be cut off, which production management system (i) outputs the basis weight of the band-like paper to the cutting torque computing unit, and (ii) computes the rotation speeds of the preceding and following knife cylinders based on the basis weight of the band-like paper and the sheet length to be cut off, and (iii) outputs the resultantly obtained rotation speed to the speed pattern generator.
  • a production management device including an input unit for inputting thereto the basis weight of the band-like paper and the sheet length to be cut off, which production management system (i) outputs the basis weight of the band-like paper to the cutting torque computing unit, and (ii) computes the rotation speeds of the preceding and following knife cylinders based on the basis weight of the band-like paper and the sheet length
  • a cut off apparatus for cutting off band-like paper is characterized in that the apparatus comprises: a preceding knife cylinder on whose peripheral surface a preceding helical knife is provided; a following knife cylinder on whose peripheral surface a following helical knife, which cuts off band-like paper in cooperation with the preceding knife, is provided; a preceding gear attached at one of the opposite ends of the rotation axis of the preceding knife cylinder; a following gear attached at one of the opposite ends of the rotation axis of the following knife cylinder; a preceding drive gear which has a meshing engagement with the preceding gear; a following drive gear which has a meshing engagement with the following gear; a preceding knife driving motor which rotationally drives the preceding drive gear; a following knife driving motor which rotationally drives the following drive gear, the following knife driving motor having the same rated capacity as that of the preceding knife driving motor; and a cut off control device which individually controls the preceding knife driving motor and the following knife driving motor.
  • a cut off apparatus as set forth in claim 11 is characterized in that, in the apparatus as set forth in claim 10, at least either one of the preceding gear and the following gear has one or more teeth shaped so that the preceding gear and the following gear do not come into contact with each other, the one or more teeth being provided at a portion of the gear relating to a cut off operation performed by the preceding and following knives in cooperation with each other.
  • a cut off apparatus as set forth in claim 12 is characterized in that, in the apparatus as set forth in claim 10, a part of at least either one of the preceding gear and the following gear has no teeth so that the preceding gear and the following gear do not come into contact with each other, the part with no teeth being provided at a portion of the gear relating to a cut off operation performed by the preceding and following knives in cooperation with each other.
  • a cut off apparatus as set forth in claim 13 is characterized in that, in the apparatus as set forth in claim 10, wherein at least either one of the preceding gear and the following gear has one or more teeth shaped so that the preceding gear and the following gear do not come into contact with each other after passing a specified distance from initiation of a cut off operation, the one or more teeth being provided at a portion of the gear relating to the cut off operation performed by the preceding and following knives in cooperation with each other.
  • a cut off apparatus as set forth in claim 14 is characterized in that, in the apparatus as set forth in claim 10, a part of at least either one of the preceding gear and the following gear has no teeth so that the preceding gear and the following gear do not come into contact with each other after passing a specified distance from initiation of a cut off operation, the part without teeth being provided at a portion of the gear relating to the cut off operation performed by the preceding and following knives in cooperation with each other.
  • a cut off apparatus as set forth in claim 15 is characterized in that, in the apparatus as set forth in any one of claim 10 through claim 14, the preceding and following knife cylinders are cylindrical members made of carbon fiber reinforced plastic.
  • a cut off apparatus as set forth in claim 16 is characterized in that the apparatus as set forth in any one of claim 10 through claim 15 comprises the cut off control apparatus as set forth in any one of claim 3 through claim 9.
  • a cut off apparatus for cutting off band-like paper as set froth in claim 17 is characterized in that the apparatus comprises: a preceding knife cylinder on whose peripheral surface a preceding helical knife is provided; a following knife cylinder on whose peripheral surface a following helical knife, which cuts off band-like paper in cooperation with the preceding knife, is provided; a preceding gear attached at one of the opposite ends of the rotation axis of the preceding knife cylinder; a following gear attached at one of the opposite ends of the rotation axis of the following knife cylinder; a preceding drive gear which has a meshing engagement with the preceding gear; a following drive gear which has a meshing engagement with the following gear; a preceding knife driving motor which rotationally drives the preceding drive gear; a following knife driving motor which rotationally drives the following drive gear; and a cut off control device which individually controls the preceding knife driving motor and the following knife driving motor, wherein at least either one of the preceding gear and the following gear has one or more teeth shaped so that the
  • a cut off apparatus for cutting off band-like paper as set forth in claim 18 is characterized in that the apparatus comprises: a preceding knife cylinder on whose peripheral surface a preceding helical knife is provided; a following knife cylinder on whose peripheral surface a following helical knife, which cuts off band-like paper in cooperation with the preceding knife, is provided; a preceding gear attached at one of the opposite ends of the rotation axis of the preceding knife cylinder; a following gear attached at one of the opposite ends of the rotation axis of the following knife cylinder; a preceding drive gear which has a meshing engagement with the preceding gear; a following drive gear which has a meshing engagement with the following gear; a preceding knife driving motor which rotationally drives the preceding drive gear; a following knife driving motor which rotationally drives the following drive gear; and a cut off control device which individually controls the preceding knife driving motor and the following knife driving motor, wherein a part of at least either one of the preceding gear and the following gear has no teeth so that the preceding
  • the preceding knife driving motor and the following knife driving motor are provided with a specified amount of torque in the direction of contact, so that band-like paper is accurately cut off.
  • the edges of the knives are made to come into contact with each other, and the cut off operation of the band-like paper is performed by the edge of one of the knives and the edge of the other knife coming into contact with each other.
  • the cutting load is reduced in the present invention.
  • the rigidity and GD 2 of the knife cylinders are reduced, so that the necessary capacity for each knife driving motor is considerably reduced. Furthermore, the band-like paper is cut under a condition where the edge of one of the knives and the edge of the other one of the knives come into contact with each other, so that edge adjustment can be approximately (easily) performed.
  • the following advantageous effects are guaranteed in addition to the effects realized by the invention as set forth in claim 1.
  • Torque applied by the preceding knife driving motor and the following knife driving motor is cancelled, while band-like paper is being cut.
  • paper feeding of the band-like paper is not influenced, so that it is possible to cut off the band-like paper with the utmost of accuracy.
  • the to-be-given torque pattern generator distributes cutting torque necessary for cutting off the band-like paper, thereby controlling the preceding knife driving motor or the following knife driving motor.
  • paper feeding of the band-like paper is not influenced, so that it is possible to cut off the band-like paper accurately.
  • the following advantageous effects are guaranteed in addition to the effects realized by the invention as set forth in claim 3.
  • the cutting torque can be changed in accordance with the basis weight and the paper feeding speed of the band-like paper.
  • the following advantageous effects are guaranteed in addition to the effects realized by the invention as set forth in claim 3 or claim 4, since a contact force is generated between the preceding knife and the following knife while the band-like paper is being cut, it is possible to suppress an edge gap between the preceding knife and the following knife.
  • the following advantageous effects are guaranteed in addition to the effects realized by any one of claim 3 through claim 5. It is possible to select an appropriate to-be-given torque pattern in accordance with the paper feeding speed. According to the invention as set forth in claim 7, the following advantageous effects are guaranteed in addition to the effects realized by any one of claim 3 through claim 6. It is possible to realize the optimum cutting of the band-like paper in accordance with the paper feeding speed, by using an even torque pattern when the rotation speed of the preceding knife driving motor and the following knife driving motor is low or intermediate, and by using a rectangular-shaped torque pattern when the rotation speed of the two knife driving motors is high.
  • the following advantageous effects are guaranteed in addition to the effects realized by any one of claim 3 through claim 7. Since the same torque pattern is given to the preceding knife driving motor and the following knife driving motor, the paper feeding of the band-like paper is not influenced while the band-like paper is being cut, so that the band-like paper can be cut off accurately. According to the invention as set forth in claim 9, the following advantageous effects are guaranteed in addition to the effects realized by any one of claim 3 through claim 8. It is possible for the production management device to change the basis weight of the band-like paper to be cut off and the sheet length to be cut off.
  • the preceding knife driving motor and the following knife driving motor since the rated capacities of the preceding knife driving motor and the following knife driving motor are the same, it is possible to employ the driving motors with the same capacity and also the power amplifiers with the same capacity. According to the present invention as set forth in claim 11 and claim 12, the following advantageous effects are guaranteed in addition to the effects realized by the invention as set forth in claim 10.
  • the preceding gear and the following gear When the preceding knife and the following knife are not in contact with each other, the preceding gear and the following gear have a meshing engagement with each other while the preceding knife driving motor and the following knife driving motor are operated in synchronism with each other, or are operated in acceleration or deceleration, so that synchronism is reliably guaranteed.
  • the preceding gear and the following gear do not have a meshing engagement, so that it is possible to control the preceding knife driving motor and the following knife driving motor separately. This realizes an appropriate cutting force.
  • FIG. 1 is a schematic front view of a cut off apparatus according to one preferred embodiment of the present invention
  • FIG. 2 is a section taken along the arrow line A-A of FIG. 1
  • FIG. 3 is a schematic side view showing the state of the upper and the lower gear at the time the upper and lower knives of the cut off apparatus of the present embodiment start a cut off operation
  • FIG. 4 is a schematic side view showing the state of the upper and the lower gear at the time the upper and lower knives of the cut off apparatus of the present embodiment complete the cut off operation
  • FIG. 5 is a control block diagram showing a cut off control device according to the present embodiment
  • FIG. 6(A) through FIG. 6 (E) are diagrams each showing a control pattern for each knife driving motor according to the present embodiment
  • FIG. 7 is a diagram showing another example of a pressure torque (to-be-given torque) pattern given by each knife driving motor according to the present invention.
  • FIG. 1 and FIG. 2 a description will be made of a construction of a cut off apparatus for cutting off band-like paper D such as a corrugated fiberboard web in a corrugating machine.
  • a cut off apparatus for cutting off band-like paper D such as a corrugated fiberboard web in a corrugating machine.
  • parallel rotational axes 6 and 7 are provided, passing through the frames 1 and 1 on both sides.
  • the rotational axes 6 and 7 are made of metal and have high rigidity.
  • the upper knife cylinder 2 and the lower knife cylinder 3 are made of a material, for example, CFRP (Carbon Fiber Reinforced Plastic: called carbon fiber for short), with high rigidity but with small GD 2 (rotational inertial force).
  • CFRP Carbon Fiber Reinforced Plastic
  • Such shapes and materials of the rotational axes 6 and 7 and the upper and lower knife cylinders 2 and 3 reduce GD 2 , thereby making it possible to realize rotation control superior in responsibility and rapidity.
  • the upper and lower knife cylinders 2 and 3 are made of a material with large GD 2 , and preload generated by the rotational inertial force and by a bend of one of the upper and lower knives provides a pressing force necessary for cutting off the band-like paper D.
  • torque given by the upper (preceding) knife driving motor 12 and the lower (following) knife driving motor 13 provides a cutting force in the present embodiment, so that the upper knife cylinder 2 and the lower knife cylinder 3 can be made of a material with small GD 2 (rotational inertial force).
  • reference character S designates the leading end (the cutting start point) of the upper and lower knives
  • reference character E designates the terminal end (the cutting end point) of the upper and lower knives.
  • the previous art employs a knife cylinder with high rigidity to apply preload to the edge of the knife for a cutting operation.
  • the upper knife 4 and the lower knife 5 engage in the direction in which the edge of the upper knife 4 and the edge of the lower knife 5 come into contact with each other, whereby the band-like paper D is cut, so that the preload is considerably reduced and adjustment of the edges of the knives can be roughly (easily) performed.
  • the rigidity of each knife cylinder 2 and 3 and their GD 2 are reduced.
  • the present art is capable of changing the cutting load (torque) depending upon the basis weight of the band-like paper D, so that the life-time of each knife 4 and 5 is increased.
  • FIG. 2 exaggerates the upper knife 4 and the lower knife 5 for purposes of illustration, and in an actual case, the diameters of the upper knife cylinder 2 and the lower knife cylinder 3 are significantly large.
  • a helical recess is provided on a part of each knife cylinder 2 and 3, and the upper knife 4 and the lower knife 5 are fitted into the recesses.
  • the upper knife 4, the lower knife 5, the upper knife cylinder 2, the lower knife cylinder 3, the rotational axes 6 and 7 can be constructed in the following way. That is, each of the upper knife cylinder 2 and the lower knife cylinder 3 is a hollow cylindrical member made of carbon fiber reinforced plastic with disk-like lids at the opposite ends thereof (or formed in one piece).
  • rotational axes 6 and 7 made of metal are bonded or fixed with bolts and nuts, etc.
  • holders made of aluminum or iron or carbon fiber reinforced plastic are attached on the peripheral surface of the upper knife cylinder 2 and the lower knife cylinder 3, which have cylindrical shapes made of carbon fiber reinforced plastic.
  • the upper knife 4 and the lower knife 5 are mounted respectively in helical form with bolts and nuts, etc.
  • rotational axes 6 and 7 with metal lids can be fixed.
  • an upper (preceding) gear 8 including split gears 8a and 8b is attached on one end (the right part of FIG. 1) of the rotational axis 6, an upper (preceding) gear 8 including split gears 8a and 8b is attached.
  • the lower (following) gear 9 which has a meshing engagement with the upper gear 8 is attached.
  • Two split gears 8a and 8b are fixed to the rotational axis 6 slightly shifted from each other in the rotational direction, so that backlash in meshing engagement with the lower gear 9 while the upper knife 4 and the lower knife 5 are not in contact with each other is prevented.
  • the upper gear 8 can be formed as a single gear and the lower gear 9 can be formed by two split gears.
  • the upper gear 8 or the lower gear 9 is not necessarily formed by two gears, and each of the upper gear 8 and the lower gear 9 can be prepared as a single gear.
  • An upper (preceding) knife driving motor 12 is connected to the upper gear 8 via an upper (preceding) drive gear 10, which has a meshing engagement with the upper gear 8.
  • a lower (following) knife driving motor 13 is connected to the lower gear 9 via a lower (following) drive gear 11 which has a meshing engagement with the lower gear 9.
  • These knife driving motors 12 and 13 are torque motors with the same rated capacity and the same output power, and these motors 12 and 13 are individually controlled by a cut off control device 20. Either one (for example, the lower knife driving motor 13) of these motors 12 and 13 is attached with an encoder 14 which detects the rotational speed of the motor.
  • the upper gear 8 and the lower gear 9 have the following characteristic features.
  • the upper gear 8 and the lower gear 9 have a meshing engagement with each other without backlash in a range thereof in which the upper knife 4 and the lower knife 5 do not come into contact with each other.
  • a range from the cutting start point C to the cutting end point O
  • the cutting start point C and the cutting end point O depend on the width B of the band-like paper D. Accordingly, in a range from the leading end (cutting start point) S of the upper and lower knives to the terminal end (cutting end point) E of the upper and lower knives, shaded areas in FIG. 3 and FIG. 4 are cut. With this arrangement, it becomes possible for the upper knife driving motor 12 and the lower knife driving motor 13 to operate in synchronization with each other with reliability when the upper knife 4 and the lower knife 5 do not come into contact with each other.
  • the upper knife driving motor 12 and the lower knife driving motor 13 can be controlled separately, thereby providing an appropriate pressing force between the upper knife 4 and the lower knife 5, so that an optimum cutting force is realized for the band-like paper D.
  • each of the upper gear 8 and lower gear 9 is provided as a single gear, one of the opposite sides of the teeth of at least one of the upper gear 8 and the lower gear 9, which teeth are arranged in a range from the cutting start point C to the cutting end point O [or a range from the leading end (cutting start point) S to the terminal end (cutting end point) E of the upper and lower knives], should be cut.
  • at least either one of the upper gear 8 and the lower gear 9 can be formed so as not to have any teeth in a range from the cutting start point C to the cutting end point O.
  • the width of all the teeth of either one of the upper gear 8 and the lower gear 9 can be reduced.
  • the teeth of the upper gear 8 and the lower gear 9 in a range (specified distance) corresponding to a specified length (the lengths of the edges of the upper and lower knives in the axial direction) Q from the leading end S of the upper and lower knives should not be cut (or removed). That is, backlash is not provided for the upper gear 8 and the lower gear 9 in a range corresponding to the specified length Q from the leading end S of the upper and lower knives. In addition, backlash is provided in a range from the point after passing the specified length to the terminal end E of the upper and lower knives.
  • the specified length Q is significantly shorter than about 100 mm, there is a possibility that the inverse edge prevention effect cannot be exerted. Further, if the specified length is significantly longer than 200 mm, there is a possibility that cutting effect which should be realized by torque control is not exerted. Thus, the specified length Q preferably falls within a range of about 100 mm to 200 mm from the leading end of the upper and lower knives.
  • FIG. 3 and FIG. 4 are schematic views, in which the upper knife 4 and the lower knife 5 are separated from each other.
  • the upper knife 4 and the lower knife 5 are provided in the vicinity of the teeth of the upper gear 8 and the lower gear 9 as shown in FIG. 2, and the edges of the upper knife 4 and the lower knife 5 are arranged so as to come into contact with each other.
  • the cut off apparatus shown in FIG. 1 and FIG. 2 has the upper knife 4 with a vertical edge and the lower knife 5 with a horizontal edge.
  • the present invention should by no means be limited to this, and the vertical and horizontal edges can be exchanged. Further, both of the knives can have vertical edges or horizontal edges.
  • FIG. 5 FIG. 6(A) through FIG. 6(E), and FIG. 7, a description will be made of a cut off control device 20 which cuts off band-like paper, such as a corrugated fiberboard web, in a corrugating machine which manufactures corrugated fiberboard sheets or the like according to the present embodiment.
  • the corrugating machine which manufactures corrugated fiberboard sheets, etc. has a production management device 40 that manages and controls the production of the whole corrugating machine.
  • the production management device 40 includes: a keyboard (input unit) for inputting therethrough the basis weight (or material, thickness, width, etc.) of band-like paper D such as a corrugated fiberboard sheet, the length L of a sheet to be cut off, the paper feeding speed Vs (or the number of sheets to be cut off per unit time); a display; a memory which records various types of data; and a Central Processing Unit (CPU).
  • a keyboard input unit
  • Vs paper feeding speed
  • CPU Central Processing Unit
  • a non-illustrated paper feeding device which feeds band-like paper D, such as a corrugate fiberboard web, to the cut off apparatus is provided with a paper feed control device 41.
  • the paper feed control device 41 controls the paper feeding speed in which the band-like paper D is fed.
  • the cut off apparatus is provided with a cut off control device 20, which includes: an instruction value computing unit 21 for generating various types of patterns; an upper (preceding) knife speed control unit 30 for controlling drive current applied to the upper knife driving motor 12; and a lower (following) knife speed control unit 35 for controlling drive current applied to the lower knife driving motor 13.
  • the production management device 40 sends the paper feeding speed Vs, the sheet length L to be cut off, and the basis weight W, to the cut off control device 20.
  • the instruction value computing unit 21 includes: a speed pattern generator 24 for generating speed patterns; a to-be-given torque pattern generator 25 for generating a torque pattern for cutting off band-like paper D; and a cutting torque computing unit 23 for computing necessary torque for a cut off operation.
  • the speed pattern generator 24 receives the paper feed speed Vs and the sheet length to be cut off for band-like paper D from the production management device 40, and generates a speed pattern shown in FIG. 6(A).
  • start time t1 of joining between the upper knife 4 and the lower knife 5 start time tc of a cutting operation, completion time to of a cutting operation, time t2 at which joining is completed and deceleration is started, time t3 at which deceleration is completed and standby is started, time t4 at which one cycle is completed, are computed for one cycle. Further, the speeds in a speed-up step (t0 through t1), a knife joining step (t1 through t2), a speed-down step (t2 through t3), a standby step (t3 through t4), are also computed.
  • the speed can be zero. Further, in cases where the paper feeding speed Vs is large and the sheet length to be cut off is long, the speed can be greater in the standby time (t3 through t4) than in the cutting time (time between tc and to). In this manner, the speed pattern shown in FIG. 6(A) is generated, and the generated speed pattern is stored in an unillustrated storage device. Further, the cutting start time tc and the cutting completion time to are sent to the to-be-given torque pattern generator 25.
  • the position computing unit 22 receives the detection speed St detected by an encoder 14 attached to the lower knife driving motor 13.
  • the detection speed St is integrated, whereby the current position Pt of the upper knife 4 and the lower knife 5 and elapsed time t elapsed from the start time t0 of one cycle is calculated.
  • the speedpattern generator 24 computes the speed instruction value Vt at the elapsed time t based on the recorded speed pattern. This calculated speed instruction value Vt is sent to the comparator 31.
  • the cutting torque computing unit 23 receives the paper feeding speed Vs and the basis weight of the band-like paper D from the production management device 40, and computes cutting torque (Txa + Txb) necessary for cutting the band-like paper D having the basis weight W at the paper feeding speed Vs by means of the upper knife driving motor 12 and the lower knife driving motor 13.
  • the cutting torque (Txa + Txb) is changed with change in the paper feeding speed Vs and in the width B of the band-like paper.
  • the value of cutting torque (Txa + Txb) should be large enough to resist a cut-off reactive force added from the band-like paper D to the upper and lower knives 4 and 5, and also to give an appropriate contact force to the upper and lower knives 4 and 5.
  • This contact force is preferably 100 kgf to 300 kgf in the horizontal direction.
  • the computed cutting torque (Txa + Txb) is sent to the to-be-given torque pattern generator 25.
  • the to-be-given torque pattern generator 25 generates a to-be-given torque pattern shown in FIG. 6 (C) based on the cutting torque (Txa + Txb), necessary for a cutting operation, sent from the cutting torque computing unit 23, the cutting start time tc, and the cutting completion time to, and stores the generated torque pattern in an unillustrated storage device.
  • the cutting torque Txa necessary for the upper knife driving motor 12 and the cutting torque Txa necessary for the lower knife driving motor 13 have the same rectangular shape.
  • the above to-be-given torque pattern can have a trapezoidal shape with increase from t1 to tc and decrease from to to t2.
  • the cutting torques Txa and Txb can start to be given before the joining start time t1 (for example, immediately before the upper and lower knives come into contact with each other).
  • backlash is not provided for the upper gear 8 and the lower gear 9 in a range corresponding to a specified length Q from the leading end S of the upper and lower knives, and backlash is provided in a range after passing the specified length Q to the terminal end E of the upper and lower knives.
  • the cutting torque Txa and Txb are applied before the joining start time t1, whereby inverse edges can be reliably prevented at the initiation of a cutting operation.
  • the cutting torque Txa and the cutting torque Txb have the same absolute value (that is, torque pattern given to the upper knife driving motor 12 and the lower knife driving motor 13 have an identical shape and are of opposite signs). This makes it possible to accurately cut the band-like paper D, with no effect on the paper feeding of the band-like paper D at the time the paper D is cut.
  • the absolute values of torque need not always be equal, and one of the cutting torques Txa and Txb of the upper knife driving motor 12 and the lower knife driving motor 13 can be larger within a range allowed by the rate capacity of the upper knife driving motor 12 and the lower knife driving motor 13.
  • the meaning of the rate capacity of each torque motor of the present embodiment includes not only a permissible successive fixed power capacity but also a permissible short time overload power capacity.
  • the torque pattern with a rectangular shape in FIG. 6 (C) is for a case where the cutting speed (paper feeding speed Vs) is low or intermediate, and the torque is constant in all the range of the speed.
  • the torque pattern shown in FIG. 7 can be employed. If the cutting speed is high, the lower knife 5 is given a cutting torque of 1.25 ⁇ Txa (this is referred to as initial-period high cutting torque) which is 1.25 times as large as the torque necessary at the time Tc of initiation of a cutting operation as shown in FIG. 7. After that, the cutting torque is decreased to 0.6 times as large as the cutting torque 0.6Txa (this is referred to as middle-period low cutting torque).
  • FIG. 7 shows a torque pattern for the lower knife driving motor 13.
  • the upper knife driving motor 12 has a torque pattern which has the same shape but is inverse in sign.
  • a to-be-given torque pattern other arbitrary shapes than the above rectangular shape or the above shape with projections and depressions are available.
  • the initial-period high cutting torque is 1.1- to 1.5-times cutting torque (1.1 ⁇ Txa to 1.5 ⁇ Txa).
  • the middle-period low cutting torque is 0.6-times to 0.9-times cutting torque (0.6 ⁇ Txa to 0.9.Txa).
  • the terminal-period normal cutting torque is 0.9-times to 1.1-times cutting torque (0.9 ⁇ Txa to 1.1 ⁇ Txa).
  • the comparator 31 receives the speed instruction value Vt sent from the speed pattern generator 24 and the detection speed St sent from the encoder 14 and compares these values.
  • the speed deviation Vt-St which is to be increased or decreased, as an operation result, is sent to an instruction torque computing unit 32.
  • the instruction torque computing unit 32 receives the speed Vt-St to be increased or decreased, sent from the comparator 31, and computes a rotational torque instruction value Tt to be output to the upper knife driving motor 12 and the lower knife driving motor 13.
  • the computed rotational torque instruction value Tt is output to the torque subtractor 33 and the torque adder 36.
  • the output pattern of the rotational torque instruction value Tt is such as that shown in FIG. 6 (C). In this manner, the comparator 31 and the instruction torque computing unit 32 perform feedback control.
  • the torque subtractor 33 receives the rotational torque instruction value Tt sent from the instruction torque computing unit 32 and the to-be-given torque instruction value Txbt sent from the to-be-given torque pattern generator 25, performs a subtraction therebetween, and sends the output torque instruction value Tt-Txbt to be output by the upper knife driving motor 12 to the upper (preceding) power amplifier 34.
  • the output torque instruction value Tt-Txbt has a pattern shown in FIG. 6(E).
  • the upper power amplifier 34 computes output current based on the output torque instruction value Tt-Txbt and gives the driving current to the upper knife driving motor 12.
  • the torque adder 36 receives the rotational torque instruction value Tt sent from the instruction torque computing unit 32 and the to-be-given torque instruction value Txat sent from the to-be-given torque pattern generator 25, and performs an addition therebetween, and sends the output torque instruction value Tt+Txat to be output by the lower knife driving motor 13 to the lower (following) power amplifier 37.
  • the output torque instruction value Tt-Txat has a pattern shown in FIG. 6(D).
  • the lower power amplifier 37 computes output current based on the output torque instruction value Tt+Txat and gives the driving current to the lower knife driving motor 13.
  • the upper (preceding) power amplifier 34 and the lower (following) power amplifier 37 amplify the torque instructions and generate actual output current to each servo motor.
  • the to-be-given torque instruction values Txat and Txbt are smaller than torque Ta, Tb, Tc, and Td necessary for motor acceleration or deceleration. It is unnecessary to increase the rated capacity of each motor by giving a cutting force to the upper knife driving motor 12 and the lower knife driving motor 13.
  • the upper power amplifier 34 and the lower power amplifier 37 can have the same rated capacity.
  • the upper knife driving motor 12 and the lower knife driving motor 13 operate in synchronism with each other.
  • the upper knife driving motor 12 applies force in the direction which makes the upper knife 4 move backward, that is, in the direction which pushes the lower knife 5.
  • the lower knife driving motor 13 applies force in the direction which makes the lower knife 5 move forward, that is, in the direction which pushes the upper knife 4.
  • torque is given to the upper knife 4 and the lower knife 5 in the direction in which these knives are pressed against each other, whereby a cutting force for cutting the band-like paper D is produced.
  • the to-be-given torque instruction values Txat and Txbt which are given to the upper knife driving motor 12 and the lower knife driving motor 13, respectively, are the same, torque given to the upper knife driving motor 12 and torque given to the lower knife driving motor 13 are cancelled.
  • force required to increase or decrease the paper feeding speed Vs is not caused, and hence the paper feeding speed is not influenced.
  • only force necessary for cutting is applied, so that accurate and correct cutting of the band-like paper D is realized.
  • the above position computing unit 22, cutting torque computing unit 23, speed pattern generator 24, to-be-given torque pattern generator 25, upper knife speed control unit 30, comparator 31, instruction torque computing unit 32, instruction torque subtractor 33, lower knife speed control unit 35, and instruction torque adder 36 are realized in the form of electrical circuits.
  • all of these can be realized as a computer program (or sequence)
  • the above computing unit, generator, controller, comparator, adder, and subtractor can be realized as a sub-program (or sub-sequence).
  • the present invention Since it is possible to accurately cut off band-like paper such as a corrugated fiberboard sheet, the present invention is considerably useful.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Details Of Cutting Devices (AREA)
EP05736741.9A 2004-09-08 2005-04-28 Vorrichtung zum abschneiden eines streifenförmigen papierglieds und steuerung der vorrichtung Expired - Fee Related EP1787772B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004260928 2004-09-08
PCT/JP2005/008184 WO2006027870A1 (ja) 2004-09-08 2005-04-28 帯状紙部材のカットオフ方法、装置及びその制御装置

Publications (3)

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EP1787772A1 true EP1787772A1 (de) 2007-05-23
EP1787772A4 EP1787772A4 (de) 2011-08-24
EP1787772B1 EP1787772B1 (de) 2013-07-24

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EP (1) EP1787772B1 (de)
JP (1) JP4264450B2 (de)
WO (1) WO2006027870A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19726993A1 (de) * 1997-06-25 1999-01-07 Jagenberg Papiertech Gmbh Messertrommel für Maschinen zum Querschneiden von Materialbahnen
JP2002284430A (ja) * 2001-03-26 2002-10-03 Mitsubishi Heavy Ind Ltd コルゲートマシンのカットオフ
JP3781996B2 (ja) * 2001-10-25 2006-06-07 日本リライアンス株式会社 ロータリシャーの制御装置および方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO2006027870A1 *

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JP4264450B2 (ja) 2009-05-20
JPWO2006027870A1 (ja) 2008-05-08
WO2006027870A1 (ja) 2006-03-16
EP1787772A4 (de) 2011-08-24
EP1787772B1 (de) 2013-07-24

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