GB2266487A - Apparatus for maintaining the adjustment between two knives of a rotary cutter - Google Patents

Apparatus for maintaining the adjustment between two knives of a rotary cutter Download PDF

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Publication number
GB2266487A
GB2266487A GB9308889A GB9308889A GB2266487A GB 2266487 A GB2266487 A GB 2266487A GB 9308889 A GB9308889 A GB 9308889A GB 9308889 A GB9308889 A GB 9308889A GB 2266487 A GB2266487 A GB 2266487A
Authority
GB
United Kingdom
Prior art keywords
cutting
knife
adjusting
sensors
zone
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
GB9308889A
Other versions
GB2266487B (en
GB9308889D0 (en
Inventor
Markus Gerstenberger
Peter Gamperling
Uwe Tessmann
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of GB9308889D0 publication Critical patent/GB9308889D0/en
Publication of GB2266487A publication Critical patent/GB2266487A/en
Application granted granted Critical
Publication of GB2266487B publication Critical patent/GB2266487B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • B26D7/265—Journals, bearings or supports for positioning rollers or cylinders relatively to each other
    • 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
    • B26D1/25—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 non-circular cutting member
    • B26D1/34—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 non-circular cutting member moving about an axis parallel to the line of cut
    • B26D1/38—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 non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member
    • B26D1/385—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 non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member 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
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Cutting Devices (AREA)
  • Nonmetal Cutting Devices (AREA)

Abstract

An apparatus for maintaining the adjustment between two knives of a rotary cutter having one knife 3 held on a rotating cylinder 1 cooperating with a stationary knife 5 being held in a holder 6. The stationary knife holder 6 is transposed with respect to the rotation axis 2 of the rotating cylinder i and is supported on a cross-member 9 through the intermediary of two sensors 7, 8. An instantaneous cutting force is computed in an evaluation unit 10 from the signals of the sensors 7, 8. Stationary knife 5 can be adjusted by means of actuating elements 6b. The knife holder may be divided into a plurality of cutting zones for individual adjustment. <IMAGE>

Description

Apparatus for adjusting a cutting knife for the cutting of webs of material The invention relates to an apparatus for adjusting a cutting knife for the cutting of webs of material, particularly for cross-cutting operations in processing machines positioned downline of a rotary printing press.
DE 29 22 164 C2 discloses a cross-cutter for the cutting of sheets of paper, cardboard or similar. Knives held on two rotating knife drums engage in pairs to perform the cut on each revolution of the drums. One of the pair-wise cooperating knives of a knife drum is mounted in the knife drum by clamping wedges and clamping bolts.
The exposed knife end that projects beyond the mounting point can be brought into engagement against the other knife by a multiplicity of adjacent drawing wedges that are disposed across the width of the knife. A disadvantage of said design is, firstly, that changes in knife adjustment are performed manually through operations on a multiplicity of bolts and drawing wedges. This results in lengthy set-up times whenever there is a change in the cutting conditions. A further disadvantage is the fact that there are no correction values whatsoever should it become necessary to adjust the engagement of the knives; consequently, the quality of the adjustment is left to the subjective discretion of the machine operator.
Proceeding from the prior art, the object of the present invention is to simplify the determination of the correct cutting-knife adjustment and to reduce the setup time required for that purpose.
The object of the invention is achieved by the following features: - a stationary knife holder is transposed with respect to the rotation axis of the rotating cylinder; - the stationary knife holder is supported on a cross-member through the intermediary of two sensors and - an instantaneous cutting force is computed in an evaluation unit from signals of the sensors.
In addition to lowering the noise level as well as reducing the excitation of vibrations as a result of the transposed arrangement of a knife holder with respect to a rotation axis, it is possible, with a minimal outlay on sensors, to determine the variations in the cutting force along the cut extending across the entire width of the knife. Merely required for this purpose are the signals of the sensors, which send signals to the evaluation unit whenever the location of the cut changes in the axial direction. In a further development of the invention, an apparatus for angle-of-rotation measurement is associated with the rotating cylinder.
In addition to the signals of the sensors, the evaluation unit may then also be supplied with information on the rotational position of the rotating cylinder, with this making it possible to associate the determined cutting force with the corresponding zone of the knife holder.
Furthermore, it is provided that the knife holder is divided into a plurality of cutting zones. Actuating elements are associated with the individual cutting zones, with the positions of individual regions of a bottom knife being variable zone by zone under remote control through the intermediary of said actuating elements. The remote control of the individual actuating elements - realized, for example, by separately energizable servomotors - allows selective control over a cutting zone. Corrections can be executed at the press of a button with the machine at creep speed, without there being a need for timeconsuming, manual adjustments.
In embodiments of the invention, it is provided that the sensors are in the form of force-measuring rings or similar. The use of such components as force sensors permits the signal characteristics to be adapted to specific requirements and allows low-cost manufacture of the apparatus according to the invention. If an apparatus for angle-of-rotation measurement is employed, from signals of the sensors and from a signal of the apparatus for angle-of-rotation measurement the evaluation unit determines the occurring cutting force zone by zone and indicates it on a display. In addition, from deviations of the zonally determined cutting force from zonal setpoint values for the cutting force correction values for the zonal actuating elements are indicated on the display.This makes it possible for the printer, starting from an initial approximate setting of the bottom knife, to proceed directly to the correct adjustment of the cutting knife, without there being any unnecessary set-up times and without any waste being printed with an incorrect adjustment of the cutting knife.
In another variant of the invention, without the use of an apparatus for angle-of-rotation measurement, from the change with respect to time of the signals of the sensors it is possible, by means of interpolation between signal edges, for a cutting force appropriate to the particular cutting zone to be determined in the evaluation unit and to be shown zone by zone on the display.
In the following, the invention is described in greater detail with reference to drawings, in which: Fig. 1 shows a rotating cylinder with associated knife holder of a bottom knife; and Fig. 2 shows an evaluation unit with downline display.
A rotating cylinder 1 holds on its circumference at least one top knife 3. The cylinder 1 rotates about its rotation axis 2. In order to determine the precise rotational position of the cylinder 1, one end face of the cylinder 1 may be provided with an apparatus for angle-of-rotation measurement 4. A cross-member 9 is attached below the cylinder 1. Resting on said crossmember and held by two sensors 7 and 8 is a knife holder 6, which holds a bottom knife 5. The knife holder 6 is transposed with respect to the rotation axis 2 of the cylinder 1, with the result that the cylinder 1 must rotate about the angle df for a complete cut encompassing the full width of the web of material.The transposition of the knife holder 6 in relation to the rotation axis 2 of the cylinder 1 results in a lowering of the noise level as well as in a reduction in the excitation of vibrations. The knife holder 6, in turn, is divided into cutting zones 6a, which are juxtaposed and extend over the axial .extent of the bottom knife 5.
Each cutting zone 6a is associated with an actuating element 6b, which, for example, may be in the form of an adjusting screw. These can -provided with fine threads - be moved within the respective cutting zone 6a and act on the sections of the bottom knife 5 corresponding to the respective cutting zones 6a. In order to provide remote control of the actuating elements 6b, the latter may optionally be connected, at their ends facing away from the knife holder 6, to shafts of servomotors; in this specific case, each of the actuating elements 6b may be associated with a servomotor, through the intermediary of which it is then possible to act on each cutting zone 6a in a manner free of side effects.
The sensors 7 and 8 can be seen below the knife holder 6. In the example shown in Fig. 1, said sensors 7 and 8 are in the form of force-measuring rings. It would, however, also be possible to employ strain gauges or other sensors for force measurement, the output signals from which can be sent to an evaluation unit. Visible below the sensors 7 and 8 is a cross-member 9, which is fixed on the machine and acts as a bearing point for the knife holder 6.
Fig. 2 shows an evaluation unit with downline display.
The signals from the apparatus for angle-of-rotation measurement 4, from the sensor A (identified here by 7) as well as from the sensor B (identified by 8) are sent to an evaluation unit 10. A display 11 downline of the evaluation unit 10 indicates the determined values zone by zone. As part of a presetting process, the evaluation unit 10 is supplied initially with data on the setpoint values of a cutting force for a specific grade of stock that is to be processed. This may be done on a job-specific or customer-specific basis, depending on the requirements. Following an initial approximate setting of the bottom knife 5, a cut is made by both knives. Since the knife holder 6 is transposed with respect to the rotation axis 2 of the cylinder 1, it is necessary, in order to perform a complete cut, for the cylinder 1 to rotate about the angle dg.
Consequently, a cutting force can be determined for each cutting zone 6a from the signals of the sensors 7 and 8.
Thanks to the signals from the apparatus for angle-ofrotation measurement 4, said cutting force can be associated precisely with a cutting zone 6a. When a complete cut is performed, it is thus possible to determine the complete variations in the cutting force from cutting zone I to cutting zone N. These zone-byzone variations in the cutting force can be indicated to the printer on the display 11. From a comparison between setpoint values and actual cutting-force values it is possible to determine deviations for each cutting zone 6a Said deviations are indicated to the printer via display 11 and are stored as correction values.
The printer can then approve the stored correction values from the printing-press control console or directly at the cross-cutter, with the result that, if provided, the appropriate servomotors are activated.
The cutting knives are now in correct adjustment, with the result that production may commence. The angle-ofrotation-sensitive measurement of the cutting force makes it possible to minimize the number of sensors required1 since it is not necessary for each of the cutting zones 6a to be provided with a separate sensor Outlined in the following is a further possible manner in which to determine the cutting force using the apparatus according to the invention.
If the apparatus for angle-of-rotation measurement 4 is not used, it is possible for the cutting force to be computed in the evaluation unit 10 from an evaluation of the edges of the signals from the sensors 7 and 8. From the change of the signal with respect to time, e.g. rise in zone 1, fall in zone N, it is possible for the cutting force in the respective cutting zone 6a to be determined by interpolation between the edges of the signals. The interpolated values for the cutting force may likewise be indicated zone by zone on the display 11. As previously mentioned, the deviations of the zonally determined cutting forces from the zonally selected setpoint values for the cutting forces can be determined and stored as correction values. In order to improve the adjustment of the cutting knife, it is possible for servomotors, if provided, to be energized with the correction values in order to move the actuating elements 69, thereby guaranteeing the correct mutual engagement of the knives in accordance with the selected setpoint values.
If the actuating elements 69 are engaged manually, it is possible for their correction values to be read off the display 11 zone by zone and for them to be implemented manually through the rotation of an adjusting screw.
It will of course be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention.

Claims (10)

CLAIMS:
1. Apparatus for adjusting a cutting knife for the cutting of webs of material, with one knife being held by a rotating cylinder and with another knife, co-operating with said one knife on the cylinder, being held in a stationary knife holder, wherein the stationary knife holder is transposed with respect to the rotation axis of the rotating cylinder and is supported on a cross-member through the intermediary of two sensors, and wherein an instantaneous cutting force is computed in an evaluation unit from the signals of the sensors.
2. Apparatus for adjusting a cutting knife according to claim 1 wherein an apparatus for angle-of-rotation measurement is associated with the rotating cylinder.
3. Apparatus for adjusting a cutting knife according to claim 1 or 2 wherein the stationary knife holder is divided into a plurality of cutting zones.
4. Apparatus for adjusting a cutting knife according to claim 3 wherein actuating elements are associated with the individual cutting zones, with the positions of individual regions of said another knife being variable zone-by-zone under remote control through the intermediary of said actuating elements.
5. Apparatus for adjusting a cutting knife according to claim 1, 2, 3 or 4 wherein the sensors are in the form of force-measuring rings.
6. Apparatus for adjusting a cutting knife according to any one of claims 1-4 wherein strain gauges are employed for the sensors.
7. Apparatus for adjusting a cutting knife according to claim 2 or any one of claims 3-6 when dependent on claim 2 wherein, from signals of the sensors and from a signal of the apparatus for angle-of-rotation measurement, the evaluation unit determines the occurring cutting force zoneby-zone and indicates it on a display.
8. Apparatus for adjusting a cutting knife according to claim 7 wherein, from deviations of the zonally determined cutting force from the zonal setpoint value for the cutting force, correction values for the zonal actuating elements are indicated on the display.
9. Apparatus for. adjusting a cutting knife according to claims 7 or 8 wherein, from the change with respect to time of the signals of the sensors, it is possible, by means of interpolation between signal edges, for a cutting force appropriate to the particular cutting zone to be determined in the evaluation unit and to be shown zone-by-zone on the display.
10. Apparatus for adjusting a cutting knife, substantially as hereinbefore described with reference to the accompanying drawings.
GB9308889A 1992-05-02 1993-04-29 Apparatus for adjusting a cutting knife for the cutting of webs of material Expired - Fee Related GB2266487B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924214675 DE4214675C2 (en) 1992-05-02 1992-05-02 Method and device for setting a cutting knife for separating material webs

Publications (3)

Publication Number Publication Date
GB9308889D0 GB9308889D0 (en) 1993-06-16
GB2266487A true GB2266487A (en) 1993-11-03
GB2266487B GB2266487B (en) 1995-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9308889A Expired - Fee Related GB2266487B (en) 1992-05-02 1993-04-29 Apparatus for adjusting a cutting knife for the cutting of webs of material

Country Status (4)

Country Link
JP (1) JP3436563B2 (en)
DE (1) DE4214675C2 (en)
FR (1) FR2690643B1 (en)
GB (1) GB2266487B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841132A1 (en) * 1996-11-06 1998-05-13 Maysun Co., Ltd. Contact pressure control method and device for rotary cutter
EP0945233A1 (en) * 1998-03-05 1999-09-29 G.D. S.p.A. Method and unit for processing sheet material
WO2001005562A1 (en) * 1999-07-16 2001-01-25 Rieter Automatik Gmbh Device and method for adjusting a cutting gap
WO2011012926A1 (en) * 2009-07-29 2011-02-03 Sidel S.P.A. Cutting unit for labelling machines
CN109109384A (en) * 2018-09-07 2019-01-01 浙江精益佰汇数字技术有限公司 A kind of efficient bag on roll cutting means
IT202000012493A1 (en) * 2020-05-27 2021-11-27 Gd Spa UNIT FOR CUTTING A TAPE OF WRAPPING MATERIAL

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JP2002001689A (en) * 2000-06-20 2002-01-08 Nippon Seiki Co Ltd Cutting device
NL1027733C2 (en) * 2004-12-13 2006-06-14 Vmi Epe Holland Cutting device.
DE102007058819A1 (en) * 2007-12-05 2009-06-10 Krones Ag Strip cutter especially label strips with roller rotating around rotation axis has force recording sensor coupled to cutting bar or element useful in label production technology lessens blade blunting and ensures longer tool life
DE102013114004B4 (en) * 2013-12-13 2018-06-14 Reduction Engineering Gmbh Wear-monitored granulation
CN104139416B (en) * 2014-07-01 2016-08-17 李秉江 Single flying knife infeed set-up

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841132A1 (en) * 1996-11-06 1998-05-13 Maysun Co., Ltd. Contact pressure control method and device for rotary cutter
US5974921A (en) * 1996-11-06 1999-11-02 Maysun Co., Ltd. Contact pressure control method and device for rotary cutter
EP0945233A1 (en) * 1998-03-05 1999-09-29 G.D. S.p.A. Method and unit for processing sheet material
US6161458A (en) * 1998-03-05 2000-12-19 G.D Societa Per Azioni Method and unit for processing sheet material
WO2001005562A1 (en) * 1999-07-16 2001-01-25 Rieter Automatik Gmbh Device and method for adjusting a cutting gap
US6575069B1 (en) 1999-07-16 2003-06-10 Reiter Automatik Gmbh Device and method for adjusting a cutting gap
WO2011012926A1 (en) * 2009-07-29 2011-02-03 Sidel S.P.A. Cutting unit for labelling machines
WO2011012333A1 (en) * 2009-07-29 2011-02-03 Sidel S.P.A. Cutting unit for labelling machines
CN102574601A (en) * 2009-07-29 2012-07-11 西得乐公开有限公司 Cutting unit for labelling machines
CN102574601B (en) * 2009-07-29 2014-08-27 西得乐公开有限公司 Cutting unit for labelling machines
CN109109384A (en) * 2018-09-07 2019-01-01 浙江精益佰汇数字技术有限公司 A kind of efficient bag on roll cutting means
IT202000012493A1 (en) * 2020-05-27 2021-11-27 Gd Spa UNIT FOR CUTTING A TAPE OF WRAPPING MATERIAL

Also Published As

Publication number Publication date
FR2690643B1 (en) 1995-05-05
DE4214675A1 (en) 1993-11-04
JP3436563B2 (en) 2003-08-11
FR2690643A1 (en) 1993-11-05
GB2266487B (en) 1995-06-21
JPH0631684A (en) 1994-02-08
GB9308889D0 (en) 1993-06-16
DE4214675C2 (en) 2001-03-08

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000429