DE4236347C2 - Rip cutter - Google Patents

Description

The invention relates to a longitudinal cutting device for Foil webs with a plurality of at least one upper one Rod-guided, upper carrier plates with attached upper cutter heads and a plurality of at least one lower rod guided, lower carrier plates with attached to it brought, interacting in pairs with the upper cutter heads, lower cutter heads, one piercing the lower carrier plates the fixed threaded spindle, one each on the lower support plates attached motor and one each with the threaded spindle in engagement located, drivingly connected to the engine, at the lower carrier plate rotatably mounted drive nut and one the lower support plates loosely piercing, motor driven splined shaft to which the lower knives of the lower cutter heads are connected to the drive.

In this slitting device known from DE-A-36 03 701 the upper carrier plates do not have their own traversing drive. You can only use the lower support plate after coupling be put. An individual, from the different ver wear-dependent adjustment of the upper knife relative to the lower knife is not possible separately for all knife head pairs. In addition, the known device does not allow the waiter knife in a defined contact position with your lower knife drive.

In the longitudinal cutting devices according to DE-A-24 53 278 and DE-A-34 22 570 is for the travel drive of the upper carrier plates  a fixed rack and a rotatable gear are provided. These Setup is for zero adjustment, especially the individual adjustment of different wear conditions inaccurate. Another disadvantage is the increased space requirement for the rack next to the carrier plate.

The present invention is based on the object slitting device with a separate zero point adjustment device for each cutter head in order to so on all pairs of cutter heads regardless of the degree of wear of the Knives, especially the upper knife, same cutting conditions, in particular to achieve the same contact pressure of the upper knife chen.

This task is at the slitting mentioned above device according to the invention solved in that the upper carrier plates are pierced by an upper fixed threaded spindle and just like the lower carrier plates with motor and drive mother and the knife holders of the upper cutter heads with a switch that can be actuated when the knife rotates associated motor are provided. Through the switch on the knife holder of the upper cutter head and the direct traversing drive each cutter head with its own motor / drive nut is possible Lich, regardless of the different wear conditions the cutter head pairs all the upper cutters in a defined contact was able to drive to their lower knife. It is achieved that even partially worn pairs of cutter heads still need give a clear cut. This setting or re-adjustment of the ver different pairs of cutter heads can be easily pre-set from the control panel be taken.

According to the preferred embodiment of the invention The upper cutter heads carry circular knife holders that with pneumatic adjustment acting in the Z-axis and X-axis  drives are equipped. These adjustment drives allow one trouble-free delivery of the upper knife to the driven Lower knife. In particular, the upper knife can initially be in Rich direction of the Z axis can be lowered to a position in which the film web is cut, and then the top knife with a continuous cut to the running lower knife be put.

Furthermore, it is preferably provided that the rotational position the circular knife holder is adjustable in the Z axis. The settings Availability is limited to a few degrees, preferably 1 to 4 °. Due to the attainable inclination of the plane of the upper knife The direction of the film web results in the overlap area of the Upper and lower knives a clearance angle that extends to the rear, d. H. opens in the direction of the cut web. The clearance angle is beneficial for a clean cut and avoiding the Thread or lint formation.

In a further embodiment of the invention, it is provided hen that one of the cutter head pairs as a double cutter head pair is formed and the two knife levels of the upper double knife head are divergent aligned in the direction of travel of the film web. Due to the divergent alignment of the circular knives of the upper dop pel knife head are also in the overlap area with the corresponding lower knives clearance angle created, which in open in the direction of travel of the film web. Through this clearance angle the same cut improvement results as in the above ge named rotational position of the individual upper knives. Here are the two knives of the double knife head expediently on one  Axis mounted, which run in the direction of the film web is bow. Due to this slight deflection of the bearing axis in a simple way the weakly divergent alignment of the two Knife and thus the formation of the desired clearance angle between between the upper knives and the associated lower knives other parallel, reached.

The lower cutter heads are preferably with knives, ins special pot knives equipped, the cutting angle β at the Cutting edge is less than 90 °. The angle is preferably β 85 to 89.5 °, in particular 87 to 89 °. Through this training the lower knife also improves the cut quality. The scope of processable film materials is expanded. In addition, the service life of the pair of knives is extended if the Angle β is less than 90 °.

It is also provided that the ends of the rods and Threaded spindles are firmly attached to two parallel cheeks and the Ge formed from the cheeks, rods, and lead screws position the knife heads against a stationary base is movable in the X direction. Since at the cut edges of the ge the strips of film formed a slight thickening due to the cut or bulging occurs when the cut is wound up stripes a bulge at the edges. To do this avoid the device according to the invention compared to stationary frame, the z. B. be an upstream machine can, as well as in relation to the rolls for winding up the strips fen in the direction of the X axis, d. H. the width of the film web marginally, especially in the order of magnitude Slowly back and forth 1 cm, causing the thickened Spread out the edges of the strips and the bulge of the rolls is reduced. For this purpose, it is advisable between the cheeks two bars attached, four on a stationary base Bearing blocks mounted, in which the rods are slidably mounted and is also a motor on the stationary frame, in particular a geared stepper motor attached to which a shaft drives  is moderately connected, the thread end with a threaded hole the adjacent cheek is engaged. The shaft rotation of the Motors can be attached to the shaft by means of belts or the like sensitive disc can be transferred.

In a further embodiment of the invention are on the carrier plates of the upper cutter heads means for mounting the blade neck tern provided so that the carrier plates additionally with blades holders can be equipped. While the circular knife holder generally on the film web start side of the carrier plates are arranged, are the mounting means for the blade holder attached to the film drain side. Expediently the carrier plates are then fitted with blade holders that pass through an actuator between an interface and an outside are pivotable. With the circular knife raised The film can then be held by the in the cutting position swiveled blade holder can be cut lengthways.

The above-mentioned procedure for retracting the upper knife a pair of cutter heads in the cutting position in which it is together cut the film with the lower knife of the pair of knife heads det, is in the above-mentioned slitter characterized in that the disengaged upper knife at a distance in the X direction from the cutting edge of the lower part sers in the direction of the Z axis in the film web while doing so the film web separates, then the upper knife in the direction the Z-axis back to that for its employment on the lower knife required height position and then in the direction of X-axis until reaching the cutting position on the lower knife and the desired starting pressure. This way, un depending on the material and the thickness of the film to be cut a trouble-free cut, especially a trouble-free cut beginning can be reached. It is essential that the Obermes water at a sufficient distance from the lower knife, the example may be 2 to 4 mm, d. H. without direct help from the sub  knife completely cuts the film web. This is depending a more or less deep depending on the film material and thickness Immerse the upper knife in the direction of the Z axis in the foils track required. Depending on the film material and thickness considerable forces are required, which weigh up to 100 kg and more can. Only when this cut is made is the waiter knife in the position to the lower knife, and in a two-stage movement, in which the waiter first knife raised in the direction of the Z axis to the cutting height and only laterally, d. H. in the direction of the X axis the lower knife is turned on. This kinematics becomes a trouble-free cut of the film web reached. Preferably the movements of the upper knife are pneumatically controlled ert.

The procedure for adjusting the zero point of a cutter head This is a couple in the above-mentioned slitter characterized in that the disengaged upper knife at a distance from the cutting edge of the running lower knife in Descends in the direction of the Z axis to the cutting height and then moto risch in the direction of the X-axis up to the touch and take traversed by the lower knife, whereby the traction motor of the upper Cutter head is switched off. This way you can be independent on the strength, wear or tolerance of the top and / or lower knife a reproducible zero point setting be enough. After this adjustment of the zero point the desired setting pressure of the upper knife is set numerically by moving the upper knife holder by one by its traction motor the line pressure corresponding distance, z. B. 0.2 mm, further against the lower knife is driven. The zero points according to the invention position allows for very different wear conditions of the cutter head pairs an equivalent zero point adjustment on all Pairs of cutter heads and the Beauf starting from this zero point hitting all pairs of cutter heads with the same contact pressure, see above that the same cutting conditions are achieved. These  Zero adjustment can be done individually for all cutter head pairs Appropriate programming is achieved on the control panel of the facility will. The pairs of knife heads adjusted in this way can be determined by numeri input of the desired contact pressure is automatically applied will. An adjustment of the contact pressure by spring tension by hand is no longer necessary.

The invention will now be described with reference to the drawing described. Show it

Figure 1 is a front view of a longitudinal cutting device according to the invention in a schematic representation.

Fig. 2 is a section along the line II-II of Fig. 1;

Fig. 3 is a section along the line III-III of Figure 2 on an enlarged scale.

. Figure 4 shows a cutter head pair of the device according to Fig 1 in an enlarged scale, partly in section and partly in view.

Fig. 5 is a section along the line VV of Fig. 4;

Fig. 6 is a section along the line VI-VI of Fig. 5;

Figure 7 is an upper double rod-cutter head on an enlarged dimension, partly in section.

Fig. 8 is a partial view of the traversing part for transverse travel availability of the device according to the invention;

Fig. 9 is a section along the line IX-IX of Fig. 8;

FIG. 10 is a side view of a blade holder to a support plate;

Fig. 11 is an axial section of the clinical holder shown in Fig. 10;

Figure 12 shows the radial section of a preferred embodiment of the lower knife.

Figure 13 is a schematic representation of the motion sequence of the upper blade when moving into the cutting position. and

Fig. 14 is a schematic representation of the sequence of movements of the upper knife in the zero point adjustment.

According to FIGS. 1 and 2, the longitudinal cutting device according to the invention comprises between two cheeks 1, four guide bars 2 of which are shown in Fig. 1 just 3. On the two obe ren guide rods 2 five carrier plates 3 are guided displaceably in the transverse direction. These plates are not visible in Fig. 1 bar. In the same way, two support plates 3 are slidably guided on the lower guide rods 2 . Between the cheeks 1 in the area of the upper support plates 3, a fixed threaded spindle 4 and in the area of the lower support plates 3, a fixed threaded spindle 5 . The threaded spindles 4 and 5 are with threaded nuts 6 and 7 in engagement, which are mounted on the carrier plates 3 rotating bar, as will be explained below with reference to FIG. 3. An upper cutter head 10 with a non-driven upper cutter 11 is attached to the upper carrier plates 3 . A lower cutter head 12 with a lower cutter 13 is rotatably mounted on the lower support plate 3 . In the lower part of the device, a spline shaft 14 is also provided, which loosely pierces the lower carrier plates 3 and is connected to a rotary drive motor (not shown) on the outside of a cheek 1 . The V-shaft 14 is drive-wise connected to the V-belt pulleys 16 of the lower cutter heads 12 via V-belts 15 .

The cheeks 1 are connected in their lower region by two Stan conditions 17 , which are guided displaceably in bearing blocks 18 , which in turn are fixedly mounted on a stationary base 19 . The displacement amplitude of the device 1-17 in the La gerböcken 18 is of the order of 1 cm. For further explanation of this traversing device, reference is made to the explanation of FIGS. 8 and 9 below.

Fig. 3 shows the implementation of the threaded spindle 4 and the guide rod 2 through the support plate 3 in section. To guide the guide rod 2 , a receptacle bushing 101 is inserted into the plate 3 , which holds a ball bushing 102 by means of retaining rings, in which the guide rod 2 runs. In the carrier plate 3 , a receptacle 103 is also used, which holds a deep groove ball bearing 104 by means of retaining rings. In the Ril ball bearing 104 , a tubular shaft 105 is mounted concentrically to the Ge threaded spindle 104 . The tubular shaft 105 carries, on the one hand, the threaded ball bushing 6 located in the engagement of the threaded spindle 4 and, on the other hand, a toothed belt pulley 107 attached by means of a key 106 . The toothed belt pulley 107 is driven by the motor 8 (see FIG. 2) via toothed belts.

In the pair of cutter heads shown in FIG. 4, the upper cutter head is shown in the view and the lower cutter head with its drive in section. A toothed belt pulley 20 is seated on the drive spline shaft 14 and is mounted in a bearing bush 21 embedded in the carrier plate 3 . In the carrier plate 3 , a bearing bush 22 is also embedded, in which the shaft 23 of the toothed belt pulley 15, which is driven by toothed belt 15, is supported by ball bearings 16 . On the shaft 23 , the pot knife 13 is clamped by means of pressure cover 24 and screw 25, which cooperates with the upper knife 11 .

The receptacle 26 for the storage of the upper knife 11 carries an electrical contact switch 27 , 27 a for the circuit of the associated traction motor 8 . The switch 27, 27a operates so that the motor circuit is closed only in a certain rotational position of the blade holder 28 so that when the stationary circular blade 11 is moved up from the side of the rotary pot diameter 13, at the moment of contact of the blade 11 and 13 the knife 11 is carried along by the knife 13 and the switch 27 , 27 a is opened so that the motor 8 is stopped. The meaning of the switch 27 , 27 a for the zero point adjustment is explained in more detail below.

The upper cutter head shown in Fig. 5 has a pneumatic cylinder 29 for receiving the pneumatic actuating piston 26 , a cylinder cover 30 for upper guidance and in the annular space between the cylinder 29 and piston 26, a compression spring 31 which the piston 26 in the absence of pneumatic actuation hits in the top position. The piston 26 carries a receptacle 34 for a pneumatic lifting cylinder at the bottom. In the Zy cylinder, a piston 35 is displaceable in the transverse direction. The piston 35 is held in the illustrated left stop position by a compression spring 36 which is supported on the cylinder cover 37 . When the piston 35 is acted upon pneumatically, the piston 35 is displaced towards the cover 37 against the force of the spring 36 , the right stop position of the piston 35 being adjustable by the threaded pin 38 . Reference numeral 48 denotes an O-ring of the piston 35 . On the rod 40 of the piston 35 , a pair of sockets 43 , 44 with an inclined ball bearing 45 is attached by means of screw 41 and cover 42 . On the outer socket 44 , the Kreismes water 11 is mounted and hold ge by means of plate spring 46 and pressure nut 59 . It can be seen that the freely rotatable upper knife 11 by the pneumatic piston / cylinder unit 26/29 in the direction of the Z-axis and by the pneumatic piston / cylinder unit 34 , 35 in the direction of the X-axis is pneumatically displaceable, with no pneumatic loading Knife 11 is held in the raised position and the position reset by the lower knife 13 .

The sectional view of FIG. 6 shows that the piston 26 is guided by a key 49 in the socket 33 without rotation. In the mounting flange 32 for the socket 33 , a threaded bore 51 is formed with a recess 51 a. The socket 33 has a nose 50 which projects into the recess 51 a. The nose 50 is acted upon on the one hand by a spring pin 53 and on the other hand by the grub screw 52 . It can be seen that the screw 52, the rotational position of the piston 26 and thus the knife 11 varies within narrow limits and thus a Freiwin angle between the upper knife 11 and the lower knife 13 can be created.

Fig. 7 shows a double knife head, the pneumatic piston / cylinder unit 26/31 corresponds to that of FIG. 5 in wesent union. On a weakly (not recognizable) bent pipe axis 60 socket pairs 43 , 44 are again provided with ball bearings 45 arranged between them. On the outer socket 44 sits a circular knife 11 , which is held by means of a plate spring (not shown) and pressure nut 59 . To the pipe shaft 60, a pneumatic cylinder is at both ends 61 is attached with a lid 62 in which a piston projecting into the tube axis 60 of the piston rod 63 is slidable a 63rd The two pistons 63 , of which the right one is not shown, are acted upon by a common compression spring 64 . A cross pin 65 in the piston rod 63 a extends through the slotted tube axis 60 and grips into the inner sleeve 43 , so that the package 43-45 with the knife 11 is moved according to the movement of the piston 63 , 63 a under pneumatic action or the spring force .

FIGS. 8 and 9 a gear stepper motor 70 is mounted by means of bracket 71 to the bearing block 18. By the motor 70 , a traversing shaft 75 is driven via a toothed belt pulley 72 by means of toothed belt 73 and toothed belt pulley 74 , which is supported in a bushing 76 with angular contact ball bearing 77 . The shaft 75 has a threaded stub 75 a, which is in engagement with a traversing nut 78 , which is inserted into the cheek 1 . It can be seen that during operation of the stepping motor 70, the cheek 1 and thus the entire device is placed opposite the stationary one on which the console 19 is attached, can perform a slow reciprocating movement of low amplitude.

According to FIGS. 10 and 11, the upper support plate 3 in the rear region a fork-shaped bearing 80 and a La gerbock 81st A worm gear 84 is pivoted on the bearing block 81 by means of bolts 83 . On the gear block 84 , the mounting disk 82 is laterally mounted for a total of eight clin 85 . The disk 82 can be rotated by means of the feed wheel 86 if the blade 85 in the cutting position is to be replaced. The blades 85 can be fastened by means of knurled screw 87 . The fastening disk 82 with the blades 85 is surrounded by a protective box 88 , from which only the blade 85, which cuts into the film web 89, projects below. On the worm gear 84 , a bracket 90 is also introduced, which is pivotally connected to a fork head 91 . Zvi rule the joints 80 and 90/91 arranged a double-acting pneu matic cylinder 92, with which the blade wheel pivoted down 82 into the position shown in Fig. 10 cutting position to the film web 89 and from the cutting position pivoted who can the.

Fig. 12 shows the radial section of the cup knife 13 , from which it can be seen that the angle β at the cutting edge 13 a is less than 90 °. Generally the angle is between 85 and 89.5 °. In Fig. 12, β is exaggerated for clarity. The knife surface 13 ^b has a concave shape in cross section (round cut).

Fig. 13 shows schematically the movement sequence of the upper circular blade 11 in the position at the lower knife 13. The upper knife first moves from position A, in which it is at a distance from the cutting edge of the lower knife located in C in both the direction of the Z axis and the X axis, in the direction of the Z axis down to a position B, in which separates the film web from the upper knife without direct help from the lower knife. If the web is cut in this way, the upper knife is moved in the direction of the Z axis to position B ', which is at the height of the position on the lower knife. In a third step, the upper knife is then moved in the direction of the X axis into position C, in which the pair of cutters cooperates in a cutting function. This kinematics of the upper knife avoids difficulties when cutting into the film web.

Fig. 14, finally, shows the movement sequence of the upper blade at the zero point adjustment. From a position A, in which the upper knife has a distance from the cutting edge of the lower knife both in the direction of the Z axis and in the direction of the X axis, the upper knife is moved in the direction of the Z axis into a position B in which it is at the height of attack in relation to the lower knife. Then the upper knife is moved to the running lower knife by moving in the direction of the X axis. In position C, the two knives come into contact, as a result of which the associated traction motor is switched off by means of switches 27 , 27 a. Position C represents the zero point from which the starting pressure can be specified.

Claims (9)

1. longitudinal cutting device for film webs with a plurality of heads on at least one upper rod ( 2 ), upper carrier plates ( 3 ) with attached upper cutter heads and a plurality of lower carrier plates ( 3 ) guided on at least one lower rod ( 2 ) with attached, with the upper cutter heads interacting in pairs, lower cutter heads, a threaded spindle ( 5 ) penetrating the lower carrier plates ( 3 ),
one motor ( 9 ) attached to the lower support plates ( 3 ) and one drive nut ( 7 ), which is in engagement with the threaded spindle ( 5 ) and is drivingly connected to the motor ( 9 ), and is rotatably mounted on the lower support plate ( 3 ), and
one motor-driven spline shaft ( 14 ) which loosely penetrates the lower carrier plates ( 3 ) and to which the lower cutters ( 13 ) of the lower cutter heads are connected by drive,
characterized in that the upper carrier plates ( 3 ) are pierced by an upper fixed threaded spindle ( 4 ) and, like the lower carrier plates, are equipped with a motor ( 8 ) and drive nut ( 6 ) and the knife holder ( 41-47 ) of the upper cutter heads a switch ( 27 , 27 a) which can be actuated when the knife ( 11 ) is rotated are provided for the associated motor ( 8 ). 2. Device according to claim 1, characterized in that the upper cutter heads ( 10 ) carry circular knife holders ( 34-46 ) which drive with pneumatic adjustment working in the Z-axis and X-axis ( 26 , 29 or 34 , 35 ) are equipped. 3. Device according to claim 2, characterized in that the rotational position of the circular knife holder ( 41-47 ) is adjustable in the Z-axis. 4. Device according to one of claims 1 to 3, characterized ge indicates that one of the pairs of cutter heads is a double cutter head pair is formed and the two knife levels of the top Double knife head divergent in the running direction of the film web are aligned. 5. Device according to claim 4, characterized in that the two knives ( 11 ) of the double knife head are mounted on an axis ( 60 ) which is bent in the running direction of the film web. 6. Device according to one of claims 1 to 5, characterized in that the lower cutter heads ( 22-25 ) are equipped with knives ( 13 ) whose cutting angle β at the cutting edge ( 13 a) is less than 90 °. 7. Device according to one of claims 1 to 7, characterized in that the ends of the rods ( 2 ) and threaded spindles ( 4 , 5 ) on two parallel cheeks ( 1 ) are fixedly attached and from the cheeks ( 1 ), rods ( 2 ) and threaded spindles ( 4, 5 ) formed frame with the cutter heads relative to a stationary base frame ( 19 ) can be moved in the X direction. 8. Device according to claim 7, characterized in that between the cheeks ( 1 ) two rods ( 17 ) are attached, on a stationary base ( 19 ) four bearing blocks ( 18 ) are attached, in which the rods ( 17 ) are axially displaceably mounted , And that on the substructure ( 19 ) a motor ( 70 ) is attached to which a shaft ( 75 ) is drivingly connected, the thread deende ( 75 a) with a threaded bore of the adjacent cheek ( 1 ) is engaged. 9. Device according to one of claims 1 to 8, characterized in that on the carrier plates ( 3 ) of the upper knife heads means ( 80 , 81 ) for mounting blade holders ( 82 ) are hen vorgese.