JP4459279B2 - SLITTER APPARATUS HAVING SLITTER CUTTER MOVING DEVICE AND SLITTER CUTTER POSITIONING METHOD - Google Patents

Description

  The present invention relates to an expansion / contraction shaft type slitter device provided with a slitter blade moving device and a slitter blade positioning method in the slitter device.

  Conventionally, many slitters that cut a long metal plate or sheet in a longitudinal direction have spacers inserted between a plurality of blades to position each blade. A so-called expansion / contraction shaft type that expands / contracts a rotating shaft to which a slitter blade is fixed by pressure has been put into practical use. This expansion / contraction type slitter is advantageous in that it can easily change the position of each slitter blade in the width direction of the metal plate, and is expected as a slitter for use in a production line that requires automation.

  In the expansion / contraction axis type slitter, there is a tendency that it is difficult to accurately position each blade in the width direction as compared with the spacer type. Therefore, how to accurately position each blade is an issue. For example, Patent Document 1 discloses a configuration in which a rail is provided on an entrance side or an exit side of a slitter and a positioning device that slides on the rail is provided in an expansion / contraction shaft type slitter. Further, Patent Document 2 discloses a slitter blade positioning device in which an instruction means for instructing the position of each blade is moved in the axial direction by a driving means such as a servo motor. Here, the movement of the instruction means is performed by automatically calculating the movement amount by inputting data such as the cutting width.

JP-A-1-188217 JP-A-5-200620

  As described above, the slitter is increasingly required to be used in an automated line, and therefore, it is desirable that the slitter blade positioning operation is also automatically performed. On the other hand, the expansion / contraction shaft type slitter has a drawback that it is difficult to obtain the positioning accuracy of each cutter, although it is easy to move in the width direction (rotational axis direction) of each cutter.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an expansion / contraction axis type slitter device including a moving device capable of automatically and accurately positioning each slitter blade, and a slitter blade positioning method.

  In order to achieve the above object, the invention according to claim 1 is a rotary shaft that can be expanded and contracted in a radial direction by a fluid pressure, and is fixed to the rotary shaft by the diameter of the rotary shaft. At least one blade holder having a substantially rigid side surface; a slitter blade attached to each of the blade holders; and configured to be able to contact the side surface of the blade holder and perpendicular to the axis of the rotation shaft A holding device having a substantially rigid contact surface and capable of holding the side surface of the blade holder, and a moving device configured to move the holding plate in a direction parallel to the axis of the rotary shaft And a slitter device comprising:

  The invention according to claim 2 provides the slitter device according to claim 1, wherein the holding plate has an elastically deformable vacuum suction pad disposed on the contact surface of the holding plate. To do.

  The invention according to claim 3 is the slitter device according to claim 1 or 2, wherein the slitter device has a plurality of the blade holders and the holding plates, and a sweep space of at least one holding plate of the plurality of holding plates is A slitter device configured to prevent interference with a sweep space of a holding plate adjacent to the at least one holding plate is provided.

  According to a fourth aspect of the present invention, in the slitter device according to the third aspect, each of the side surfaces of the blade holder has a substantially annular shape, and each of the holding plates is a substantially quadrant of the annular shape. A slitter device configured to adsorb to a surface is provided.

  The invention according to claim 5 provides the slitter device according to any one of claims 1 to 4, further comprising a nozzle for supplying a lubricant to the surface of the rotating shaft.

  According to a sixth aspect of the present invention, there is provided a rotary shaft that can be expanded and contracted in the radial direction by fluid pressure, and a substantially rigid side surface that is fixed to the rotary shaft by the diameter of the rotary shaft and is perpendicular to the axis of the rotary shaft. An at least one blade holder; a slitter blade attached to each of the blade holders; A slitting device comprising: a holding plate capable of holding the side surface of the blade holder; and a moving device configured to move the holding plate in a direction parallel to the axis of the rotation shaft. A slitter cutter positioning method is provided, wherein the cutter holder is moved by the movable body while rotating a rotary shaft to which the cutter holder is to be fixed.

  The invention according to claim 7 provides the positioning method according to claim 6, further comprising supplying a lubricant to the surface of the rotary shaft during or before the blade holder is moved. To do.

  The invention according to claim 8 has a rotating shaft that can be expanded and contracted in a radial direction by fluid pressure, and a substantially rigid side surface that is fixed to the rotating shaft by the diameter of the rotating shaft and is perpendicular to the axis of the rotating shaft. The slitter blade in a slitter device, comprising: at least one blade holder; a slitter blade attached to each of the blade holders; and a moving device configured to move the blade holder in an axial direction of the rotation shaft. In the positioning method, the amount of movement of the blade holder by the moving device is corrected by using the amount of movement of the blade holder in the axial direction relative to the rotation axis of the blade holder due to the diameter increase of the rotation shaft measured in advance as a correction amount. Providing a positioning method.

  According to the present invention, the blade holder to which the slitter blade is attached can be accurately positioned in the axial direction without being inclined with respect to the rotation axis.

  By providing the vacuum suction pad on the contact surface of the holding plate, the holding plate can be more reliably attracted to the side surface of the blade holder.

  With the configuration in which the sweep space of a certain holding plate does not interfere with the sweep space of the holding plate adjacent to the holding plate, the interval between the adjacent blade holders can be reduced to one holding plate. Further, according to the present invention, as a specific example of such a configuration, a holding plate having a shape that is attracted to a substantially quadrant of a side surface of a substantially annular blade holder is provided.

  By supplying the lubricant to the surface of the rotating shaft, the friction coefficient between the blade holder and the rotating shaft can be reduced, and the blade holder can be moved with a smaller holding force.

  According to the present invention, there is provided a positioning method capable of accurately adjusting the position of the slitter blade and moving the blade holder with a smaller holding force by moving the blade holder while rotating the rotary shaft.

  By correcting the amount of movement of the blade holder with respect to the amount of movement of the blade holder relative to the rotation axis due to the diameter increase of the rotation axis measured in advance as a correction amount, the blade holder can be positioned more accurately on the rotation shaft.

  FIG. 1 is a diagram showing a preferred embodiment of a slitter device according to the present invention. The slitter device 10 includes an upper rotating shaft (upper arbor shaft) 14 and a lower rotating shaft (lower arbor shaft) 16 that are rotatably supported by the gantry 12 and are parallel to each other. The upper rotating shaft 14 has a plurality (12 in the illustrated example) of annular upper cutter holders 18 arranged in the axial direction, and each upper cutter holder 18 has an annular cutter or a round blade 20. Similarly, the lower rotating shaft 16 has a plurality of annular lower cutter holders 22 arranged in the axial direction, and each lower cutter holder 22 has an annular cutter or a round blade 24. The blade holder and the round blade are preferably made of a substantially rigid material such as metal, and can have the same configuration in the upper and lower sides. The “substantially rigid body” here is typically a metal and is made of a material that does not affect the positioning accuracy of the slitter blade although the amount of deformation is strictly elastically deformed with respect to the load. Point to.

  A workpiece 26 such as a thin steel plate to be cut by the slitter device 10 is inserted substantially horizontally between the vertical rotation shafts as shown in the front view of FIG. 1 and travels in the direction indicated by the arrow 28 in the side view. The workpiece being run is rotated by rotating the upper rotary shaft 14 and the lower rotary shaft 16 so that at least one of them approaches the other, whereby each pair of round blades 20 and 24 has a predetermined number of strips (up and down 12 in the illustrated example). Since there are a pair of round blades, it is cut into 11). The above configuration may be the same as the conventional one.

  As shown in the side view and the top view of FIG. 1, the slitter device 10 according to the present invention is a movement for moving each of the upper cutter holder 18 and the lower cutter holder 22 in the axial direction of the fixed rotating shaft. It has a device 30. The moving device 30 includes an upper linear guide 32 and a lower linear guide 34 provided in parallel to the upper rotary shaft 14 and the lower rotary shaft 16, and a drive source such as a servo motor on each of the upper linear guide 32 and the lower linear guide. One or more (four in the illustrated example) movable bodies, that is, an upper slider 36 and a lower slider 38 are movable (not shown) (see FIG. 2). In the front view of FIG. 1, the linear guides and sliders of the moving device described in the top view are not shown for the sake of clarity.

  The moving device 30 has the same number of upper holder holders 40 and lower holder holders 42 as the upper cutter holder 18 and the lower cutter holder 20, respectively. Although the details will be described later, each holder holding portion has a function of abutting on and adsorbing to the side surface (surface perpendicular to the rotation axis) of each blade holder and moving each blade holder in the rotation axis direction, that is, a positioning function. Have. The number of holder holders is preferably the same as the number of blade holders in terms of shortening the time required for positioning the blade holder, etc., but if the distance between the blades is short, the sliders may interfere with each other. Since it is possible, one holder holding part can also be made to move a plurality of blade holders. In the illustrated example, one holder holding unit is configured to move three blade holders. Preferably, the number of sliders is 1/3 to 1/4 of the number of blade holders.

  As shown in the top view of FIG. 1, each holder holding portion is provided with a holding plate 44 having a contact surface configured to be able to contact the side surface of each blade holder, and the holding plate 44 is fixed at a position in the rotational axis direction. And fixing means 46 for the purpose. Specifically, the fixing means 46 is a hand lock mechanism that can be fixed to a bar 48 that is provided on the gantry 12 and extends parallel to the axial direction of the rotating shaft, while the upper slider 36 and the lower slider 38 are attached to the holding plate 44. Engaging means such as a lock pin that engages and moves the holding plate 44 in a direction parallel to the rotation axis direction is provided.

  FIG. 2 is an enlarged view of the vicinity of the blade holder holding portions 40 and 42. Since the lower holder holding part 42 may have the same configuration as that of the upper holder holding part 36, only the upper holder holding part 36 will be described. 2, the holder holding portions 40a and 40b for positioning the two adjacent blade holders 18a and 18b in the upper blade holder 18 of FIG. 1 will be described.

  The holder holding portions 40a and 40b are configured to be movable along a guide rail 49 parallel to the upper rotating shaft 14, and can be fixed on the guide rail 49 by hand locks 46a and 46b, respectively. The slider 36 has engagement means 47a and 47b such as lock pins that engage with the holding plate 44a or 44b, and can move the holding plate 44a or 44b in the direction of the rotation axis.

  As described above, the side surface 50a of the blade holder 18a is configured to be perpendicular to the axis of the upper rotating shaft 14 (see FIG. 1), and the holding plate 44a of the upper holder holding portion 36a is also configured to be perpendicular to the axis of the rotating shaft. The contact surface 52a is formed (see FIG. 3A). Further, at least the side surface 50a of the blade holder 18a is made of a substantially rigid body such as metal, and the holding plate 44a is also made of at least the contact surface 52a of a substantially rigid body such as metal. Therefore, the contact surface 52a contacts the side surface 50a of the blade holder by contact between substantially rigid bodies, for example, by metal touch. A concave portion 54a is formed on the contact surface 52a of the holding plate 44a, and the concave portion 54a generates a suction force by a vacuum means (not shown) through a flow path 56a formed in the holding plate 44a. In addition, although the recessed part 54a in the example of illustration has a groove shape extended over about 1/4 of the circumference centering on the rotating shaft center, as long as it can suck and hold a blade holder, what kind of shape may be sufficient as it. Therefore, the contact surface 52a of the holding plate 44a that is in contact with the side surface 50a of the blade holder 18a by metal touch can suck and hold the blade holder 18a. In this state, the upper slider 36 holds the holding plate 44a in the axial direction. The blade holder 18a can be moved at the same time. Here, since the contact surface 52a is perpendicular to the rotation axis, the side surface 50a of the blade holder that is metal touching the contact surface 52a is also held perpendicular to the rotation axis. Therefore, even if the blade holder is relatively thin, it is not held by the holding member while being inclined with respect to the rotation axis.

  The blade holder 18b and the holder holding portion 36b have the same configuration, and the same components are shown by changing the end of the reference symbol from a to b in FIG.

  In order to more securely hold the blade holder by the contact surface 52a of the holding plate 44a, as shown in FIG. 3 (a), the recess 54a formed in the holding plate 44a is made of an elastic body such as rubber. It is preferable to arrange the suction pad 58a. The suction pad 58a is configured to generate a suction force by evacuating from a through hole 62a provided in the upper portion 60a. The bottom outer peripheral portion 64a of the suction pad 58a forms substantially the same surface as the contact surface 50a, or preferably slightly protrudes (for example, about 0.5 to 1 millimeter) from the contact surface 50a as illustrated. . This protrusion distance is such that when the cutter holder is moved, the bottom outer peripheral portion 64a is surely brought into contact with the side surface 50a of the cutter holder 18a (see FIG. 3B) and generates an adsorption force sufficient for the movement of the cutter holder. On the other hand, the distance is set such that the bottom outer peripheral portion 64a of the suction pad 58a is elastically deformed and does not hinder the metal touch between the holding plate 44a and the side surface 50a of the blade holder 18a.

  As shown in FIG. 3B, the suction pad 58a may have a protrusion 66a that can come into contact with the side surface 50a of the blade holder 18a, for example, in the vicinity of the approximate center thereof. Since the protrusion 66a substantially reduces the region where the suction force is generated (the region surrounded by the bottom outer peripheral portion 64a of the suction pad 58a), higher suction can be achieved if the vacuum means (not shown) has the same degree of vacuum. Can generate power.

  In the example of FIG. 2, three suction pads 58a having a substantially track shape are arranged, but any shape and number may be used as long as they generate a desired suction force. For example, 4 to 8 circular suction pads can be arranged.

  As shown in FIG. 2, the holding plates 44 a and 44 b are configured to suck and hold the substantially quadrants of the side surfaces 50 a and 50 b of the blade holders 18 a and 18 b, respectively, and the sweep space (moving of one holding plate) The space that passes through is configured so as not to interfere with the sweep space of the other holding plate. Specifically, the side surface of the blade holder with which each holding plate abuts is a quadrant that is at a different position with respect to the rotation axis. This will be understood from the front view of FIG. With such a configuration, the holding plates 44a and 44b can be simultaneously located at the same position with respect to the rotation axis direction. Therefore, the blade holders 18a and 18b approach each other up to the thickness of one holding plate in this case. can do. This is advantageous when the workpiece has to be cut very narrowly (when adjacent blade holders have to be positioned in close proximity).

  Note that a holding means of a type that holds the side surface of the holder using an electromagnet can be used instead of the suction pad that uses the suction force by vacuum. However, when an electromagnet is used, wiring for that purpose must be provided in the holding plate, and the thickness may not be sufficiently reduced as compared with the vacuuming type described above. Further, when an electromagnet is used, the blade holder and the blade are magnetized, and there is a possibility that metal powder or the like generated by cutting the workpiece is attracted to the blade or the side surface of the holder. The metal powder adsorbed on the blade can hinder a good cutting operation, and the metal powder adsorbed on the side surface of the holder can hinder suction by the holding means. Therefore, the above-mentioned vacuum type is preferable as the holding means.

  Hereinafter, the positioning procedure of each blade holder using the above-described moving device will be described. First, the fluid pressure such as hydraulic pressure is not applied to the upper and lower rotary shafts, and the rotary shaft is reduced. In this state, each blade holder can be freely moved in the axial direction with respect to the rotation axis. Next, using the configuration described with reference to FIGS. 2 and 3, the holding plate 44a is brought into contact with the side surface 50a of the blade holder 18a, and the suction pad 58a is evacuated to suck and hold the blade holder 18a. .

  In this state, as schematically shown in FIG. 4, the blade holder 18a has an inner diameter that is somewhat larger than the outer diameter before the rotating shaft 14 is expanded. It is ready to move. Next, the slider 36 of the moving device 30 positions the holding plate 44a at a predetermined position in the rotation axis direction. Strictly speaking, only the upper part inside the blade holder 18a is the outer periphery of the upper part of the rotation shaft 14 as shown in FIG. Since it is in a so-called “one-sided” state in contact with the part, the movement is not always performed smoothly due to a phenomenon such as the blade holder tilting when moving in the axial direction by the moving device. Therefore, the movement of the blade holder by the moving device is preferably performed while rotating the rotating shaft. That is, when the rotary shaft is stopped, in order to move the blade holder, it is necessary to move to overcome the coefficient of static friction between the blade holder and the rotary shaft. It is only necessary to move to overcome the dynamic friction coefficient. Since it is obvious that the dynamic friction coefficient is lower than the static friction coefficient, the holder can be moved smoothly with a small adsorption force by moving the holder while rotating the rotating shaft.

  It is also very effective to reduce the static friction coefficient or the dynamic friction coefficient by applying a lubricant between the rotary shaft and the inner periphery of the blade holder during or before the blade holder is moved. For example, as shown in FIG. 2, a lubricant supply nozzle 70a is provided in the vicinity of the tip of the holding plate 44a, and a lubricant such as lubricant oil can be supplied to the nozzle 70a from a lubricant supply source (not shown). Since it is difficult to positively inject the lubricant between the rotating shaft and the blade holder, the nozzle 70a is preferably configured to drop lubricating oil or the like onto the rotating shaft 14 as shown in FIG. . By installing a nozzle that drops lubricating oil at an appropriate interval in the width direction (rotating axis direction), and further rotating the rotating shaft, the lubricating oil diffuses on the rotating shaft due to the wettability and centrifugal force of the lubricating oil, As a result, the lubricating oil can be distributed to the inner diameter portion of the blade holder.

  By moving the blade holder while rotating the rotary shaft as described above, or by supplying a lubricant between the rotary shaft and the blade holder, the load applied to the holding plate during the movement of the blade holder can be further reduced. it can. Since the strength required for the holding plate may be low, the thickness of the holding plate can be reduced as a result. If the holding plate can be made thin, the blade interval can be set shorter.

  When the number of sliders is smaller than the number of blade holders as in the present embodiment, one slider sequentially positions the blade holders. Since the holding plate holding the blade holder that has been positioned is fixed to the guide rail by a hand lock mechanism (46a, 46b, etc. in FIG. 2), the holding plate and the holding plate are attracted and held after positioning. The blade holder does not move in the axial direction.

  When positioning of all the blade holders is completed, hydraulic fluid is injected into the vertical rotation shaft to expand the diameter of the rotation shaft, and each blade holder is fixed. Here, each blade holder moves in the radial direction of the rotating shaft, although slightly, as the rotating shaft expands. Therefore, for example, in the state of FIG. 3B, the side surface 50a of the blade holder 18a moves relative to the contact surface 52a of the holding plate 44a, but the side surface of the blade holder and the contact surface of the holding member rotate. Since it extends in the direction perpendicular to the axis, the moving direction of the holder relative to the holding member is also limited to the direction perpendicular to the rotation axis. Accordingly, the axial position of the blade holder once positioned does not shift due to the diameter increase of the rotary shaft. In the case of suction holding via a suction pad, a very strong suction force acts when the blade holder and the holding plate are about to move away from each other in the direction of the rotation axis (perpendicular to the contact surface). It is relatively easy to move in the direction perpendicular to the axis of rotation with respect to the plate. This tendency becomes more remarkable when the lubricant is supplied to the blade holder. Therefore, according to the present invention, since the position of the cutter holder once positioned can be accurately maintained in the rotational axis direction, the cutter holder can be moved in the direction perpendicular to the rotational axis along with the diameter expansion of the rotary shaft. Undesirable stress is prevented from being applied to the holding plate holding the holder.

  In a general expansion / contraction shaft type slitter, a liquid such as a hydraulic fluid is injected from one end of the rotation shaft to expand the diameter of the rotation shaft, and a holder provided with a cutter is fixed to the rotation shaft. Here, when injecting hydraulic fluid or the like from one end of the rotating shaft, the rotating shaft does not necessarily expand uniformly in the axial direction. For example, as exaggeratedly shown in FIG. 5, when hydraulic fluid is injected from the right end of the rotating shaft 14, the rotating shaft tends to increase in diameter from the injected right side. In this case, each blade holder 18 is pushed to the side opposite to the hydraulic fluid injection side in the process until the diameter expansion of the rotating shaft 14 is completed. As described above, even if the blade holder is accurately positioned before the diameter is increased, the axial position may be shifted during the process of expanding the rotation axis. In the above-described embodiment, the tool holder once positioned is fixed so as not to move in the direction of the rotation axis by the hand lock. However, when the diameter of the rotation axis is increased, a considerable force acts on the tool holder. Depending on the injection conditions of the hydraulic fluid and the structure of the rotating shaft, the axial position of the blade holder may be somewhat displaced when the rotating shaft is expanded.

  Therefore, in the present invention, this problem is solved by the following procedure regarding the movement of the blade holder by the slider described above. First, the misalignment direction and misalignment amount of each blade holder when the diameter of the rotating shaft is expanded are measured in advance. It has been found that this positional deviation direction and positional deviation amount can be highly reproducible if the conditions such as the hydraulic fluid injection speed are the same. Next, the position correction amount of each holder before diameter expansion is obtained based on this measurement result. And when performing the movement control of each blade holder by the above-mentioned moving device, the control considering the position correction amount is performed. Usually, an amount equal to the measured displacement amount is given in the direction opposite to the displacement direction. Thereby, each blade holder is accurately positioned at a desired position in a state after the diameter of the rotary shaft is expanded under the same conditions as in the measurement. Such a correction process can be automatically performed if the measurement result is obtained in advance, and is particularly useful for a slitter apparatus used for an automated line.

  Finally, the vacuum to the holding plate of the holder holding unit is shut off to invalidate the suction force, and the holding plate is moved away from the blade holder (right side in the example of FIG. 2).

It is a schematic block diagram of the slitter apparatus which concerns on embodiment of this invention. It is a figure which shows the detail of the moving apparatus of a blade holder. It is sectional drawing which follows the III-III line of FIG. It is the schematic which shows the state in which the cutter holder has hit | abutted on the rotating shaft of a diameter-reduced state. It is the schematic which shows a mode that a blade holder moves to an axial direction by the diameter expansion of a rotating shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Slitter apparatus 12 Base 14 Upper rotating shaft 16 Lower rotating shaft 18, 22 Blade holder 30 Moving device 32, 34 Linear guide 36, 38 Slider 40, 42 Holder holding part 44a Holding plate 50a Side surface 52a Contact surface 54a Recessed part 58a Adsorption pad

Claims (8)

A rotating shaft that can be expanded and contracted in the radial direction by fluid pressure;
At least one blade holder having a substantially rigid side surface that is fixed to the rotation shaft by an expansion of the rotation shaft and is perpendicular to the axis of the rotation shaft;
A slitter blade attached to each of the blade holders;
A holding plate configured to be capable of contacting the side surface of the blade holder and having a substantially rigid contact surface perpendicular to the axis of the rotary shaft, and capable of holding the side surface of the blade holder; and the holding plate; A moving device having a moving body configured to be movable in a direction parallel to the axis of the rotating shaft;
A slitter device comprising:   The slitter device according to claim 1, wherein the holding plate has an elastically deformable vacuum suction pad disposed on the contact surface of the holding plate.   A plurality of the blade holders and the holding plates are provided, and the sweep space of at least one holding plate of the plurality of holding plates is configured not to interfere with the sweep space of the holding plate adjacent to the at least one holding plate. The slitter device according to claim 1 or 2.   4. The slitter device according to claim 3, wherein each of the side surfaces of the blade holder has a substantially annular shape, and each of the holding plates is configured to be attracted to a substantially quadrant of the annular shape.   The slitter apparatus of any one of Claims 1-4 which further has a nozzle for supplying a lubricant to the surface of the said rotating shaft. A rotary shaft that can be expanded and contracted in a radial direction by fluid pressure, at least one blade holder that is fixed to the rotary shaft by expanding the rotary shaft and has a substantially rigid side surface perpendicular to the axis of the rotary shaft, and the blade A slitter blade attached to each of the holders, and a substantially rigid contact surface that is configured to be able to contact the side surface of the blade holder and is perpendicular to the axis of the rotating shaft, and the side surface of the blade holder is A holding plate that can be held, and a moving device that has a moving body configured to be able to move the holding plate in a direction parallel to the axis of the rotation shaft.
The positioning method, wherein the cutter holder is moved by the movable body while rotating a rotary shaft to which the cutter holder is to be fixed.   The positioning method according to claim 6, further comprising supplying a lubricant to a surface of the rotating shaft during or before the movement of the blade holder. A rotary shaft that can be expanded and contracted in a radial direction by fluid pressure, at least one blade holder that is fixed to the rotary shaft by expanding the rotary shaft and has a substantially rigid side surface perpendicular to the axis of the rotary shaft, and the blade A slitting tool attached to each of the holders, and a moving device configured to be able to move the tool holder in the axial direction of the rotating shaft, a slitting tool positioning method in a slitting device,
A positioning method including correcting a moving amount of the blade holder by the moving device as a correction amount based on a movement amount in the axial direction of the rotating shaft relative to the rotating shaft of the blade holder due to a diameter increase of the rotating shaft measured in advance. Method.

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