KR20050062652A - Sharpening umit and cutting machine comprising at least one blade and said sharpening unit - Google Patents

Abstract

The sharpening unit (50) comprises a grinding wheel unit (80) with at least two grinding wheels (51, 53) opposed to act on two sides defining a cutting bevel of the blade (19). The grinding wheel unit is provided with at least a degree of freedom to center the grinding wheels (51, 53) in respect of a lying surface of the portion of the cutting bevel of the blade (19) on which said grinding wheels act.

Description

SHARPENING UMIT AND CUTTING MACHINE COMPRISING AT LEAST ONE BLADE AND SAID SHARPENING UNIT}

The present invention relates to a cutter for cutting logs and the like of web material for long length products and in particular for small rolled products for packaging and sale.

More specifically, the present invention relates to a cutter having at least one cutter blade and at least one sharpening unit associated with the cutter blade.

The invention also relates to sharpening units for cutters or for other machines with blades which are constant or periodically sharpened.

In the paper conversion industry, logs or rolls of substantial shaft length are produced by winding a predetermined amount of paper, such as tissue paper, followed by small rolls of toilet tissue, kitchen towels and the like. For this purpose, the logs are cut at right angles to their axes, divided into a plurality of small rolls of suitable length, and then packaged for distribution and sale. The logs are cut by a special "cutting" machine, with one or more cutting blades and one or more sharpening units per blade.

Similar necessities have been found in other technical areas, particularly in the logs of web material windings, where long products need to be cut into smaller parts.

US-A-3,213,731 discloses a cutter for a log of web material, wherein the disk-shaped blade has a main axis parallel to the direction of supply of the log to be cut, which is supplied along a supply passage toward the cutting area. Rotate the shaft supported by the rotating unit in turn.

Although two disc shaped cutter blades are provided, similar cutters are disclosed in US-RE-30,509. In this case, the axis of rotation of each disk-shaped blade is parallel to the axis of the log to be cut, but is oblique with respect to the main axis of rotation of the unit carrying the blade, but is parallel to the direction of supply of the log to be cut. It obtains the constituents of blade movement, and can proceed in continuous movement at a constant speed. The sharpening unit with two sharpening abrasive wheels for each blade periodically makes each blade lose its cut edge.

EP-A-507750 discloses a cutter, wherein the rotary unit carrying the disk-shaped blades alternately has a transducer movement so that the log to be cut is moved forward in a continuous movement. The feed rate of the log is variable and not constant, and a series of advantages are obtained in terms of mechanical stress, reduction in overall dimensions and adaptability. Even in this case, the sharpening unit is provided with two polishing wheels to recover the cutting edge of the blade.

EP-A-609668 discloses a cutter having a rotating unit which carries two disk-shaped blades which rotate at respective axes parallel to the log to be cut but which are oblique with respect to the rotating axis of the rotating unit. Logs are supplied at variable speeds such as those disclosed in EP-A-550750 to obtain the same flexibility advantage.

EP-A-055190 discloses a cutter with a spiral cutting blade and a sharpening unit with two abrasive wheels.

US-A-5,038,647 discloses a cutter using brand blades, particularly those suitable for cutting rolls with large diameters, rather than disc shaped blades. Two sharpening units with different functions are combined with the blades. The first sharpening unit with motorized polishing wheels forms and sharpens the main bevel of the blade, while the second unit with idle grinding wheels sharpens the counter bevel or second bevel.

WO-A-0136151 discloses a sharpening unit for a blade of a cutter having a tool for polishing an abrasive wheel.

In the prior art, abrasive wheels will be sharpened in order to offset a decrease in diameter (in the case of a disc or spiral) or width (in the case of a bandblade) due to wear caused by repeating the sharpening operation. The polishing wheel is carried by the polishing wheel unit moving gradually toward the blade.

Movement toward the blade is normally set by the operator as a function of the sharpening number performed on the blade. In other words, the polishing wheel unit moves toward the blade by a predetermined degree after a predetermined number of sharpening operations, which is expected to correspond to a decrease in wear and a constant dimension of the blade. Movement towards the blade is calculated and contact is always ensured by sufficient pressure of the abrasive wheel against the blade, even if there is more wear than expected by accident. This is often more pressing than the wear wheel's need for the blade and as a result also the blade wears excessively. In contrast, insufficient sharpening can be pressed by means of abrasive wheels and blades that do not move sufficiently close together. In this case, sharpening is not performed efficiently.

In addition, due to the strength of the polishing wheel unit, the pressure at which the two polishing wheels operate on the two sides of the blade is not the same, which is caused by unavoidable error in the position, tolerance and uneven wear with respect to the polishing wheel. will be.

The invention is better understood by the following description and the accompanying drawings which show non-limiting practical embodiments of the invention.

More specifically, in the drawings,

1 is a schematic side view of a cutter for cutting a roll of web material, having a rotating unit carrying a disk-shaped blade, to which a sharpening unit according to the present invention is applied;

FIG. 2 shows a front view and a partial sectional view of the sharpening unit in the first embodiment according to II-II in FIGS. 1 and 3;

3 is a view showing a side view and a partial sectional view taken by III-III in FIG. 2;

4 is a plan view taken by IV-IV in FIG.

5 is a partial side view of the sharpening unit in different embodiments

FIG. 6 is a plan view taken by VI-VI in FIG. 5; FIG.

FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 5. FIG.

Purpose and Summary of the Invention

It is an object of the present invention to provide a sharpening unit, which is not exclusive to a sharpening unit, in particular a cutter for cutting a long length product, but which makes it more efficient with respect to the sharpening unit of the prior art.

The present invention provides a cutter for cutting a product, in particular not exclusive to the logs of the web material, consisting of at least one particularly efficient sharpening unit, on the one hand which makes the blade precisely pointed and on the other hand abrasion to the blade. Limit it.

For this purpose, according to the first aspect of the present invention, there is provided a sharpening unit comprising at least two opposing polishing wheels and a polishing wheel running on two sides of a blade, wherein the polishing wheel unit is implemented by a polishing wheel. It provides a sharpening unit having a minimum degree of freedom so that the polishing wheel is centered with respect to the intersecting surface of the portion of the cutting edge of the blade. This balances and evens out the sharpening action performed on the two sides of the blade. Moreover, the polishing wheel has a movement toward the blade, recovering any reduction in the dimensions of the blade caused by abrasion, and by the self-centering of the polishing wheel, it is possible to more precisely control the pressure applied, the pressure and excessive Wear can be avoided.

The blade may be a blade in the form of a plate disk and may actually center with respect to the intersecting plane of the cutting edge. However, the blade may also have other shapes, for example, a spiral of the corresponding edge of the cutting edge. Can extend in a spiral. In this case, the centering of the two polishing wheels occurs with respect to the intersecting surface of the part of the cutting edge or with respect to the cutting bevel of the blade which the polishing wheel temporarily performs, and this surface is located at the position of the polishing wheel along the blade. Thus changes. In the case of a brand blade, the intersecting plane of the cutting edge is a plane parallel to the portion of the brand forming blade in which the area of the cutting edge is found to be sharp at the same time with respect to the grinding wheel coming to the center.

Another aspect of the invention relates to a cutter for cutting an elongated product, comprising: at least one passageway for the product to be cut; At least one device for supplying a product along the passage; At least one blade with a cutting movement to cut the product; At least one sharpening unit for the blade having a polishing wheel unit having at least two opposing polishing wheels acting on two sides of the blade. According to the invention, the machine is characterized in that it comprises at least a degree of freedom such that the polishing wheel unit, which is the cutting bevel of the blade on which the polishing wheel acts, centers the polishing wheel with respect to the intersecting surface of the portion of the cutting edge. Abrasion wheel unit with respect to the blade, if the latter dimension is slightly changed due to abrasion, for example, the wear can be restored by moving the polishing wheel towards the blade without also moving the polishing wheel unit. This fixed position can be taken. Nevertheless, typically, the sharpening unit has a system for moving the polishing wheel unit toward the blade along the direction of forward movement, in order to recover wear on the blade. In this case, the magnetic center of the abrasive wheel is particularly important and advantageous as onset of excessive sharpening pressurization, or conversely, insufficient pressurization and such conditions of insufficient sharpening are avoided.

According to a particular embodiment, the polishing wheel unit is also provided by degrees of freedom, which partly limits the polishing wheel with respect to the blade. For example, through the effect of a return spring and / or actuator which limits the degree of freedom of movement of the polishing wheel unit in accordance with this degree of freedom, a partially limited degree of freedom is intended as if limited movement is possible. For example, the polishing wheel unit is free to move in one direction, but the movement is limited in the other direction or the movement is contrasted by the return spring. This freedom of movement also allows the polishing wheel to contact the sharpened blade and prevents movement from the cutting edge.

According to an embodiment, this second degree of limitation or limited freedom is expressed by the fact that it is desirable for the polishing wheel unit to rotate or oscillate about the oscillation axis. In this way, it rotates about an oscillation axis which is generally disposed at an intermediate position between the transverse plane of the portion of the cutting edge at which the abrasive wheel acts as a circumference and the axis of rotation of the abrasive wheel. If the blades are not arranged in a plane but have cutting edges arranged on intersecting surfaces of different shapes, such as in the case of a helical blade, the oscillation axis may lie in a plane proximate to the intersecting surface of the portion of the cutting edge.

Polishing wheels are generally arranged with their respective axes of rotation obliquely. According to a preferred embodiment of the invention, the vibrating axis of the polishing wheel is advantageously located at the minimum distance between the rotating axes. In practice, the oscillation axis can be the axis of symmetry of the polishing wheel, ie arranged in a substantially symmetrical manner with respect to the oscillation axis. The movement of the polishing wheel unit with respect to the oscillation axis should be limited, and rather than the tendency to move to the non-operational position, the polishing wheel is effectively stressed to contact the blade that will be pointed. For this purpose, an elastic return element, an actuator element or other element or means for controlling the pressurization may be formed by pressing the blade with the polishing wheel. Therefore, in practice, the vibration of the polishing wheel unit represents more degrees of freedom in the movement of the polishing wheel unit, and this movement is not strictly completely free, but is limited so that the polishing wheel is effectively brought to the operating position relative to the blade. Occurs in the direction.

The oscillation axis of the polishing wheel unit is essentially parallel to the direction of supply of the polishing wheel unit with respect to the blade and is essentially orthogonal to the direction of supply of the product to be cut towards the blade.

According to another characteristic advantage of a possible embodiment of the invention, the polishing wheel unit is freely moved in parallel in the direction of parallel movement which is not parallel to the intersecting plane of the blade, centering the polishing wheel with respect to the intersecting plane. , The middle plane of the blade. The direction of translation is preferably essentially orthogonal to the transverse plane of the blade and is substantially substantially parallel to the direction of supply of the product to be cut. Therefore, the axis of vibration of the polishing wheel unit is advantageously orthogonal to the direction of parallel movement of the unit. Therefore, according to a preferred embodiment of the present invention, the polishing wheel unit has a first degree of freedom made up of facts capable of parallel movement in the direction of parallel movement and a second degree of freedom made up of facts capable of vibrating about the axis of vibration. And later movements are limited to the manners and reasons described above.

The machine according to the invention has at least one blade. In addition, a single sharpening unit or more than one sharpening unit may be connected to the blade or each blade. In this case, it is preferable that two or more sharpening units have different characteristics and functions. For example, the first unit powers the polishing wheel to sharpen the main bevel of the blade, and the second unit includes an idle grinding wheel to sharpen the counter bevel of the blade. The polishing wheels of the two units generally have different inclinations. One blade with two sharpening units for sharpening the bevel and counter bevel (or second bevel) is disclosed in US Pat. No. 5,038,647. In the case of a blade with a single sharpening unit, the motorized abrasive wheel or the process grinding wheel is motorized and drawn out in rotation by the frictional force with the blade.

Further advantageous features and embodiments of the present invention will be described in the appended claims, some embodiments of which are described below.

Detailed Description of the Preferred Embodiments of the Invention

1 is a view schematically showing a cutter according to the present invention. In this case, it is a cutter for a roll of paper or other winding web material, the cutting being carried out by a disk-shaped blade rotation that rotates about an axis, and is carried by an alternately rotating unit about the main axis of rotation. And parallel or nearly parallel to the direction of the feed of the roll to be cut. It is preferable that a sharpening unit of the type shown in Figs. 5 to 7 be applied to a machine of this type with a motorized polishing wheel. However, a sharpening unit having an idle grinding wheel of the type shown in Figs. 2 to 4 can be applied (when necessary to be combined or optional). In the following, the sharpening unit described with particular reference to FIGS. 2 to 7 may be applied to different machines, such as a cutter having a spiral blade or a band blade. Therefore, it should be understood that the machine shown in FIG. 1 should be purely intended as an example of a possible machine to which the sharpening unit according to the present invention can be applied.

In addition, the sharpening wheel of the unit shown in Figs. 2 to 4 may be a motorized polishing wheel, and conversely, the grinding wheel of the sharpening unit shown in Figs. 5 to 7 may be a process grinding wheel.

1 is a diagram schematically showing the cutter 1 (limited to its front portion). The machine has a supply passageway of the log to be cut (L), which is pressed by the pusher 3 which is immersed in the flexible chain element 5 or the like, and is driven against a drive wheel supported by the fixed structure 7. . Only one drive wheel 9 is shown in FIG. 1, while the other is the rear end of the cutting machine, not shown. Indeed, as known from the prior art, there may be more than one flexing element 5 in parallel for feeding several rows of logs L by parallel passages.

The flexure elements 5 which engage the various parallel feed channels of the logs can be motorized separately from each other to stagger the movement of the logs for each feed channel.

Reference numeral 11 denotes the cutting head generally by means of a support 13 carrying the rotating unit 17. The unit 17 rotates about the horizontal axis A-A parallel to the direction of the supply fL of the log L. As shown in FIG. In the illustrated example, the disk-shaped blade 19 is mounted on the rotating unit 17 and rotates about its own axis of the rotating shaft BB parallel to the axis AA and the direction of the supply fL of the log L. FIG. . Two or more disk-shaped blades 19 for rotating the axes of rotation distributed about the axes A-A are formed on the rotary unit 17. The rotating unit 17, which is a known method per se, has a selective parallelism parallel to the direction fL, or the blades 19 are formed individually by this movement and in this case with respect to the unit 17. Move in parallel. In either of these cases, logs can be supplied continuously rather than intermittently moving.

Reference numeral 21 denotes a motor for transmitting rotational movement to the rotation unit 17 by the belt 23. The second motor 25 is positioned on the support 13 of the rotating unit 17, and supplies the rotational movement by the belt 27 to the shaft driving the rotating disk-shaped blade 19 during rotation. . By means of the belt 31, the third motor 29 drives the guide wheel 9 of the continuous bending element 5 during rotation. As described above, as some parallel channels are formed for the supply of logs L, which are cut separately to form a small roll R, the guide wheel 9 is associated with each channel and has its own motor unit. 29 is suitably controlled like the angular position of the rotary unit 17. Reference numeral 35 denotes a program control unit which synchronizes toward the movement of the bending element 5 via the motor 29 having the angular position of the rotation unit 17 driven during rotation by the motor 21.

The sharpening unit 50 is disposed on the rotary unit 17 and makes the blade 19 sharp. The sharpening unit 50 has two polishing wheels 51 and 53 and acts on two sides of the cutting edge of the blade 19.

2 to 4 show a first embodiment of the sharpening unit 50. In this embodiment, an orbital abrasive wheel is used and is pulled in rotation through the effect of frictional forces acting during contact between each abrasive wheel and the blade 19. The sharpening unit 50 has a pair of plates 55 and 57 which are fixed to the rotary unit 17 (or another part of the cutting machine, for example a support frame of a band blade, if not having a rotary unit). A bar 59 with a circular portion between the two plates 55 and 57 extends to form a slide guide for the same number of bushings 61. The bushing is integrated with the carriage 63.

The carriage 63 is formed by the bar 59 along the arrow f63 in order to retain the abrasive wheel in the operating position, which sets off the reduction in the dimensions of the blade 19 due to the wear caused by sharpening. It moves along the guide and gradually moves about the axis BB of the blade 19.

The movement of the carriage 63 along the arrow f63 is controlled by a free wheel mechanism 65 which is fixed against a threaded bar 67 parallel to the guide bar 59. The nut screw 69 which integrates with the carriage 63 is engaged with the thread bar 67. The rotation of the free wheel mechanism 65 is controlled by a piston cylinder actuator 67 having a short stroke acting on the black kit 73 integrated with the free wheel mechanism 65. Reference numeral 75 denotes a return spring of the black key 73. Each stoke extending the actuator 71 causes the thread bar 67 to rotate by an angular step so that it moves forward by a controlled degree in the direction of the arrow f63 of the carriage 63.

The cantilever black kit 77 is integrated with the carriage 63 and supports a pair of guides that are essentially parallel to the axis BB of the blade 19 and essentially perpendicular to the direction of translation f63 of the carriage 63. do. The slide 81 supporting the polishing wheel unit 80 moves freely along the guide 79. The shaft 85 is idlely supported by a bearing 85 inside the slide (see in particular FIG. 2). The shaft 85 rotates freely on the axis C-C, parallel to the axis of the threaded bar 67, so that the carriage 63 and the sharpening wheel are parallel to the direction f63 in which the blade 19 moves relative to the blade 19.

Secured to the bottom of the shaft 85 is a plate 87 which is integrally fixed to the two blocks 89 supporting the polishing wheels 51 and 53. As particularly shown in FIG. 3 with respect to the polishing wheel 53, the polishing wheel is carried by a spindle 91 supported by a bearing 93 in the block 89. The rotation of the polishing wheel is produced by the frictional force between the sides of the blades 19 and them.

The plate 81 moves completely and freely along the direction of movement along the double arrow f81 parallel to the guide 79, and the plate 87 carried by the shaft 85 is connected to the pulling spring 95. Is elastically stressed at a predetermined angle position (defined by the stopper 88 schematically shown in FIG. 2), one end of which is fixed to the plate 87 side and the other of the slide 81. It is fixed at a suitable point (eg point 90 in FIG. 3). In addition, the spring 95 may be fixed to a fixed point with respect to the black kit 77. Coupling to the slide 87 is preferably such that in this case the stress of the spring does not attempt to form the curvature of the blade.

By this configuration, the polishing wheel unit 80 has a free path along the direction of the movement f81 and can be rotated by the fact that the plate 87 can be rotated by the existence of the degree of freedom (the pulling spring 95). Limited). The polishing wheels 51 and 53 integrated with the polishing wheel unit 80 are doubled so as to be centered with respect to either the transverse plane of the blade 19, the mid plane of the blade or the transverse plane of the cutting bevel. Formed by movement. Since the first movement is a movement along the guide 79 in a direction orthogonal to the intersecting plane of the blade, in the layout of the machine of FIG. 1, it is parallel to the direction fL of the supply of the product L to be cut. Since the second movement vibrates with respect to the axis C-C orthogonal to the axis B-B of the blade, the second movement vibrates in the supply direction of the product. As can be seen in particular in FIGS. 2 and 3, in the intermediate position between the two polishing wheels 51 and 53, the axis CC lies in the middle plane of the blade or in the transverse plane of the cutting edge of the blade. Is more common. More specifically, the axis C-C is a central position with respect to the axes A1-A1 and A2-A2 of the two polishing wheels 51 and 53.

Because of this configuration, the polishing wheel can be centered with respect to the blade 19 and the pressure acting on the blade is controlled to prevent excessive pressurization. In fact, when the polishing wheel unit 80 is moved, through the action of the free wheel mechanism 65, the polishing wheel 51, towards the axis BB of the blade 19 by the arrow f63, to a certain degree, accordingly. 53 reacts to the blade 19 fixed in the space between the polishing wheels. Since the movement of the slide 81 and the plate 87 along the guide 79 along the arrow f81 is free, this movement causes the polishing wheels 51 and 53 to always be centered with respect to the centerline plane of the blade. To be in the position. At the same time, the fact that the polishing wheel unit can rotate the polishing wheels 51 and 53 with respect to the axis CC is determined by the force of the pulling spring 95 by the two polishing wheels applying the same pressure to the blade. Means that.

As the draw spring 95 extends by a very short extent as a result of moderate vibration of the polishing wheel about the axis CC, the frictional force is essentially constant so that the pressure acting by the polishing wheel against the blade is the axis CC. Regardless of the degree of the angle of vibration to, it is essentially constant. Therefore, the forward movement step along the direction f63 approximates the radial wear of the blade 19 so that the polishing wheels 51 and 53 are centered with respect to the blade, even if the effective wear of the blade is less than expected. Due to the fact that it is possible and the presence of the pulling spring 95, essentially the same contact force can always be obtained between the abrasive wheel and the blade, and the reduction in wear on the blade and its Increase duration

Instead of the spring 95, other systems may be used to apply controlled stress to the plate 87 and the polishing wheels 51 and 53 about the axis CC, for example to control the stress. There is a piston cylinder actuator with a device.

In addition, the position sensor may be formed to detect the angular position of the plate 87 and the polishing wheels 51 and 53 to control the forward movement of the polishing wheel unit 80 as a function of wear on the blade. have. Indeed, as the blade wears and its diameter decreases, if the carriage 63 with the polishing wheel unit 80 does not move forward along the direction f63, the decrease in diameter will result in the plate 87 and the shaft ( Offset by the rotation of the polishing wheels 51 and 53 relative to CC).

In addition to the plate 87 encountering the stop 88, an offset to a certain point can be obtained. By detecting the angular position of the plate 87, the plate 87 reaches a predetermined angular position, and wear to the blade is restored by the forward movement of the carriage.

As shown in the example shown, parallel to the axis AA of rotation to permit continuous supply of the product L to be cut, in order to prevent onset of inertial forces on the polishing wheel unit 80 and the carrying slide 81. The unit 17 moves in accordance with the replacement parallel movement, which tends to move along the guide 79, and can fix the balancing force to the slide 81, and the polishing wheel unit 80 and the slide. It is restricted to move along the direction of the guide in the direction opposite to the direction in which 81 is moved. This configuration is schematically indicated by broken lines in FIG. 3. Equilibrium force is indicated by (101). Guided along a guide parallel to the guide 79 (not shown), the rack 105 integrated with the slide 81 is connected by the pinion 103. In addition, the pinion which revolves and is supported with respect to the fixed shaft with respect to the structure 77 is integrated with the balancing force 101 and meshes with the rack which is not shown in figure. In this way the inertial forces act simultaneously on the balance force 101 and the assembly constituting the polishing wheel unit 80 and the slide 81 does not cause parallel movement of these elements along the direction f81.

In addition, since the acceleration extracted from the alternating movement of the unit 17 prevents the generation of the torque for the polishing wheel unit 80 to make the unit, the polishing wheels 51 and 53 are moved to the axis CC. And the polishing wheel unit 80 is dimensionally marked and balanced so that the center of gravity is at the axis CC, or at least the center of gravity of the element is free to rotate the shaft, ie the shaft 85, the block 89. Plate 87 and polishing wheels 51 and 53 are thereon.

The device described with reference to FIGS. 2 to 4 is particularly suitable for producing counter bevels for blades 19 and the like, for example, branded blades. In this case, the sharpening unit in question is combined with another sharpening unit which produces a major bevel.

For these other sharpening units, they are generated in the same manner as described or as shown in the example of the embodiment in Figs. This alternative embodiment is also used to create a single sharpening unit and makes the blade sharp without counterbeveling.

5 to 7 do not show a system in which the grinding wheel towards the blade moves, which can be formed as in the previous example. The equivalent number increased by 200 indicates the same or equivalent part as in the previous embodiment. Reference numeral 277 denotes a cantilevered black kit that supports the slide 281 that carries the polishing wheel unit 280. The slide 281 carrying the polishing wheel unit 280, once again marked 19, moves freely along the guide 279 orthogonal to the transverse plane of the blade parallel to the axis of rotation B-B. The slide 281 rotatably supports the shaft of the polishing wheel unit 280 to which the plate 287 is fixed about the axis CC, and the polishing wheel unit 280 attaches the polishing wheels 251 and 253. It is integrated with block 289. In this case, the polishing wheel is motorized and 254 denotes each motor, which may be a motor filled with compressed air or the like, in a manner known per se. The axis C-C is again on the transverse plane of the center position and the cutting edge of the blade with respect to the axes A1-A1 and A2-A2 of the two polishing wheels 251, 253.

Other elements common to the previous examples of embodiments such as a mobile balance system are present although not shown.

When the polishing wheels 251 and 253 are pressed against the blades 19, for example, the vibration of the blades can be stressed by the forward movement according to the arrow f63, so that the polishing wheels 251 and 253 Causes vibration about the axis CC moving from the blade. This occurs due to the remarkable bending parallel movement in which the blade 19 is processed. This causes vibration and defects in sharpening.

In order to prevent such defects, the device described below, denoted by 350, is combined with the polishing wheel unit 280.

The device 350 consists of a slider 351 embedded in the support 353 integrated with the slide 281 (eg, via a black kit, not shown for the sake of accuracy). The end of the rear surface of the slider 351 is fixed by the black kit 355 by the piston cylinder actuator 357, and is in turn fixed to the support 353. Expansion and contraction of the piston cylinder actuator 357 causes rotation of the cylinder 351 about the axis D-D. Cylinder 351 has a front log 351A that cooperates with plate 287 and integral Apex 359.

The slider 351 has a channel 361 (especially see FIG. 7) extending along the axis D-D of the slider 351 and the short arc of the helix coaxial. The roller 363 attached by the spindle 365 integral with the support 353 engages in the channel 361. Channel 361 and roller 363 form a cam mechanism that causes the slider to move along axis D-D when actuator 357 causes a slider rotation about the axis. The axis, which is the thrust on the slider, does not cause axial movement due to the inclination of the channel 361 and is selected so that the mechanism cannot be canceled.

In this manner, the polishing wheels 251 and 253 are first moved toward or away from the blade 19 by an unshown forward moving device that generates movement by f63 when operation is required. The blade 19 is inserted into the space between the polishing wheels 251 and 253.

In this position, the polishing wheel cannot contact the blade 19. Extension of piston cylinder actuator 357 to bring the slider to a predetermined position corresponding to the angular position of plate 287 and block 289 and hence the angular position of abrasive wheels 351 and 353 with respect to axis CC. By force to the required pressure on the side of the blade (19). Because of the cam mechanisms 361 and 363 that cannot be canceled, this position is maintained even when the bending parallel movement of the blade 19 causes the axial force to act on the cursor 351. The movement of the vibration about the axis CC generated by the extension of the actuator 357 produces a parallel movement of the slider 281 along the direction f281 and intersects the axis CC, ie the blade 19. To the centerline. Therefore, also in this case, the polishing wheel system is self-centering with respect to the blade.

The polishing wheels are in their angular position with respect to the axis CC until the actuator 357 acts again in the opposite direction to cause the polishing wheel to vibrate about the axis CC and to move from the side of the blade 19. It is locked and pressed with moderate pressure against the blade 19, finally bringing it to the inoperative position. The vibration is not shown, but can be controlled by the return spring.

Therefore, the embodiment of Figs. 5 to 7 allows the polishing wheel to self-center and to move the polishing wheel alternately in the operating position and the non-operating position.

This second embodiment is also formed by a system similar to that described with reference to FIGS. 2 to 5, which prevents inertial forces on the polishing wheel.

The drawings merely show a practical embodiment of the invention, but will vary in shape and configuration without departing from the scope of the concept according to the invention. Any number in the appended claims is provided merely for ease of understanding with reference to the above description and the accompanying drawings, and is not intended to limit the scope of protection to the extent.

As described above, according to the present invention, there is provided a sharpening unit that makes a blade more efficient than a conventional sharpening unit.

The present invention provides a cutter for shearing a product, in particular not exclusive to the logs of the web material, consisting of at least one particularly efficient sharpening unit, on the one hand which makes the blade precisely pointed and on the other hand wear-resistant to the blade. It is possible to limit.

Claims (27)

To a blade 19 consisting of polishing wheel units 80 and 280 having at least two polishing wheels 51, 53; 251 and 253 opposed to act on two sides defining the cutting bevel of the blade 19 As the sharpening unit 50 for, The polishing wheel unit is formed with at least a first degree of freedom and centers the polishing wheels 51, 53; 251, 253 with respect to the intersecting surface of the portion of the cutting bevel of the blade 19 on which the polishing wheel acts. Sharpening unit characterized by. The method of claim 1, Sharpening unit, characterized in that consisting of a system (65, 67, 69) to move the polishing wheel unit toward the blade in the direction of forward movement (f63). The method according to claim 1 or 2, And the polishing wheel unit is formed in a second degree of freedom and is partially limited so that the polishing wheel is centered with respect to the intersecting surface. The method of claim 3, wherein The polishing wheel unit may vibrate with respect to the oscillation shaft CC disposed at an intermediate position between the rotation shafts A1-A1 and A2-A2 of the polishing wheels 51, 53; 251, 253, and the second Sharpening unit, characterized in that there is a possibility to move with respect to the vibration axis constituting a degree of freedom. The method of claim 4, wherein The oscillating axis CC is arranged essentially on a transverse plane of the part of the cutting bevel of the blade on which the abrasive wheel acts, or essentially on a plane proximate the transverse surface of the part of the cutting bevel of the blade. Sharpening unit characterized by. Sharpening unit according to claim 2, characterized in that the direction of forward movement (f63) of the polishing wheel unit is parallel to the oscillation axis (C-C) of the polishing wheel unit (80; 280). The method according to any one of claims 4, 5, or 6, Sharpening unit, characterized in that the polishing wheels (51, 53; 251, 253) are arranged in an essentially symmetrical manner with respect to the oscillation axis (C-C). In claim 1 or more of the preceding claims, The polishing wheel units (80; 280) are free to move in parallel with the direction of parallel movement (f81; f281) that is not parallel to the intersecting surface of the portion of the cutting bevel carried by the polishing wheel, and the direction of parallel movement The movement according to the sharpening unit, characterized in that made of the first degree of freedom. The method of claim 8, And wherein said direction of translation is essentially substantially orthogonal to said intersecting surface. The method according to claim 4 and 8 or at least 4 and 9, The shaft of the vibration (C-C) is a sharpening unit, characterized in that orthogonal to the direction of parallel movement (f81; f281) of the polishing wheel unit. The method of claim 4, wherein Sharpening unit, characterized in that the center of gravity of the polishing wheel unit (80; 280) is disposed on the axis of vibration (C-C). The method of claim 8, wherein Equilibrium force moving along the direction of parallel movement (f81; f281) is combined with the polishing wheel unit (80; 280), the link means 103 moves in a direction opposite to the polishing wheel unit along the direction Sharpening unit, characterized in that formed by forcing a balance force. The method of claim 4, wherein And the polishing wheel unit is stressed at a predetermined angular position with respect to the axis of vibration (C-C). In claim 1 or more of the preceding claims, Sharpening unit, characterized in that the grinding wheel is composed of a means for bringing the operating position and the non-operation position alternately. The method of at least 3, 8 and 14, The means generates a movement of the vibration of the polishing wheel unit 281 near the axis of vibration CC to move the polishing wheels 251 and 253 with respect to the blade and maintain contact with the blade in the operating position, The polishing wheel unit (281) is a sharpening unit, characterized in that consisting of an actuator (357) to be freely moved along the parallel moving direction (f281) to be centered with respect to the blade. The method of claim 5, Control elements 351-365 operated by the actuator are engaged with the polishing wheel unit, and are made with respect to the polishing wheel unit to move the polishing wheel with respect to the blade and bring it to the operating position, the control element being canceled. A sharpening unit, characterized in that it is stressed by a blade against a polishing wheel unit that does not produce an opposing movement to the movement, thereby bringing the polishing wheel with respect to the blade. The method of claim 16, The control element generates a slider 351 that rotates around an axis DD controlled by the actuator, and an axial sliding of the slider into the support 351 when the slider rotates about an axis by the actuator. And a mechanism (361,363, 365), wherein the shaft sliding of the slider generates a rotation of the polishing wheel unit in a direction for the polishing wheel (251, 253) to move relative to the blade (19). 8. At least according to claim 4 and 7, The polishing wheel units 80 and 280 are rotatably near the axis CC of the vibration by slides 81 and 281 sliding along a sliding guide 79 parallel to the parallel movement direction f81 and f281. Sharpening unit, characterized in that consisting of a plate (87; 287) supported. The method of claim 2, wherein Sharpening unit, characterized in that the sliding guide is carried by a carriage (63) that moves along the direction (63) of the forward movement of the polishing wheel unit (80; 280). The method of claim 4, wherein Sharpening unit, characterized in that consisting of the angle position sensor of the polishing wheel unit with respect to the angle of vibration (C-C). At least a passage L for the product to be cut; Devices (3, 5) for supplying products along at least the passages; A blade 19 formed by a cutting movement to cut at least the product; As a cutting machine for cutting a long product consisting of at least the sharpening unit 50 for the blade, A polishing wheel unit (80; 280) having at least two polishing wheels (51, 53, 251, 253) opposing to execute the blade (19), The sharpening unit is a cutter, characterized in that made in accordance with one or more of the preceding claims. The method of claim 21, And said polishing wheel unit vibrates near an axis of vibration (C-C) substantially orthogonal to the feed direction of the product to be cut along said passageway. The method of claim 21 or 22, And the polishing wheel unit (80; 280) is free to move in parallel along the direction of parallel movement (f81) essentially parallel to the direction (fL) of the supply of the product (L) to be cut. The method according to claim 21, wherein at least one of: The at least one blade 19 is a cutter which is carried by the unit 17 rotating near the axis AA of rotation, and is a disk-shaped blade rotating around the respective axis BB. . The method of claim 24, The at least one disk-shaped rotating blade 19 is formed by alternating movement essentially parallel to the feeding direction of the product to be cut, and the balancing force 101 moves along the direction of the parallel movement. (80; 280), wherein the connecting means 103 is formed by forcing a balancing force to move in a direction opposite to the polishing wheel unit along the direction. 26. At least one of claims 21 to 25, Sharpening unit is a cutter, characterized in that coupled with the at least one blade. The method of claim 26, The first sharpening unit has an idle grinding wheel, the second sharpening unit powers the polishing wheel, and the polishing wheel of the first unit and the polishing wheel of the second unit have different inclinations with respect to the blade. Cutting machine made.