EP0335181B1 - Device for cutting rolls of bands or foils especially of paper, rolled on spindles - Google Patents

Description

The invention relates to a device for cutting rolls (logs) of ribbon-shaped or sheet-shaped goods wound on thorns, preferably paper, in rolls of smaller axial width by means of circular saw blades set in rotation and guided through the rolls to be cut up.

In known machines of this type, the rollers to be cut are advanced axially against guideways against two saw blades arranged diametrically to one another, rotating around a central axis and thereby rotating about their own axis. However, these known sawing machines have the defect that the rollers to be cut are pressed axially against the surface of the respectively effective saw blade during the sawing. This leads to an oblique course of the interface with respect to the axis of the rollers to be cut and also to increased heat development on the saw blades. Last but not least, these known sawing machines represent considerable production capacity bottlenecks in production lines.

From GB-A-1.091.600 a device for cutting paper rolls is known, in which a rotating saw blade is used, the axis of rotation of which moves in a circle, so that after each cut the saw blade can be guided to a grinding device. During the grinding process, the paper roll is moved a little further and then the next cut is made.

In a circular knife cutting machine according to DE-C-2211884, the circular knife pivotably arranged by means of a rocker is moved intermittently during operation from the rest position to the working position and back, whereby during the rest position, the knife is also reground and the material to be transported is transported further.

The disadvantage of these devices is that the production is considerably delayed by the respective regrinding between two cuts.

In contrast, the invention has for its object to improve a device of the type specified in such a way that all previously known disadvantages, such as set-up and downtime, quality problems, production capacity bottlenecks, production capacity limitation upwards, increased rejects problems, etc. are eliminated.

This object is achieved according to the invention by a device of the type described above, which is characterized by a modular sawing machine unit which can be arranged on a transport path for the rolls to be cut and has at least two pivoted arms which are pivotably attached and controlled about a central axis and which have free ends carry a saw blade assembly with a number of saw blades which are arranged in the desired axial width of the rollers to be produced corresponding axial distances from one another, with side and next to or below the central pivot axis of the swivel arms collecting and support trays to be integrated into the transport path for the rollers to be divided .

The device according to the invention has the advantage that it can be integrated into all existing production lines or can be installed in any new system.

The sawing machine unit according to the invention can be adapted to the work cycle of previous and subsequent machines.

In all existing systems, the existing sawing or cutting machines can be retained as emergency or bypass machines, so that the rollers to be cut can be guided onto the existing sawing or cutting machines in an emergency. Normally, the existing sawing and cutting machines are then designed with a continuous transport path, which is passed through by the cut rolls produced and, in an emergency, has to be removed for commissioning the existing sawing and cutting machines.

The manufacturing costs of the sawing machine unit according to the invention are significantly lower than the costs of other known sawing or cutting machines.

Another advantage is that by using several saw blades at the same time, the entire roll can be cut into a large number of smaller rolls in one operation. This significantly increases the throughput of long rolls compared to the known machines.

The swivel arms that carry the saw blade assembly can be controlled so that the lowering into the cutting position is slower than the lifting into the rest position. This means that the knives slowly penetrate the trunk to be cut. This avoids that the knives get a blow when placed on the trunk, which in turn extends the service life compared to conventional sawing devices.

The saw blade assembly itself can consist of a large area torsion tube unit that has a number of Has pipe pieces that can be plugged together. The pipe pieces preferably have pegs in one end face and openings on the other end face, so that the pegs of one pipe piece can be inserted into the opening of the other pipe piece. A saw blade is arranged between each two pieces of pipe and also has openings for pushing the pins through. The length of the pipe sections can be chosen according to the desired paper roll length.

The entire arrangement of pipe pieces and saw blades is clamped by means of a tie rod device and thus fixed.

In one embodiment of the invention, pusher are laterally assigned to the support shells to remove the divided rolls.

In another advantageous embodiment of the invention, the collecting and support trays for the rolls to be cut are designed as quarter shells that can be swung apart to allow the cut rolls to pass downward when the quarter shells are swung apart. By removing the cut rollers downwards, a substantially identical increase in the working speed of the device can be achieved compared to the axial discharge that has been customary up to now.

Within the scope of the invention, the holding and pivoting trays can be assigned to the holding rollers which can be divided into swiveling hold-down devices. The interplay of support trays and hold-downs securely fixes the rolls to be cut over their entire length, which is particularly important since the original roll is cut into a large number of rolls in one operation. The support trays and hold-down devices enable safe cutting or sawing, which results in a clean cut and thus an increase in quality.

Another advantage is that rolls of any diameter can be cut. Because of the hold-down device, rollers with a smaller diameter than that of the support trays are held securely in the support trays.

In a preferred embodiment of the invention, a transport device for the feeding and removal of saw blade units is attached above the central swivel axis of the swivel arms, the swivel arms reaching vertically between the parts of this transport device. This transport device essentially consists of two revolving chains with half-shells for receiving the shaft of the saw blade assembly. The entire transport device is vertically displaceable, so that when the swivel arms are in the vertical position, they can accommodate the saw blade unit to be removed. A program memory for prepared, ready-to-use saw blade units of different designs can be assigned to the transport device in order to be able to quickly switch from the production of rolls of a first axial width to rolls of a second axial width.

There is also the option of using saw blade units with different axial saw blade spacing to simultaneously produce rolls of different widths.

Since it is possible according to the invention to quickly replace the entire saw blade assembly by another, it is not necessary that the saw blades have to be reground in between. The entire saw blade unit is therefore resharpened outside the sawing machine unit. However, should it be necessary due to special production conditions, for example due to the material to be sawn through, to regrind the saw blades during use of the unit, a known grinding device can also be provided.

If a plurality of saw cuts are to be made next to one another at short axial distances, it can be advisable according to a further embodiment to provide several pairs of swivel arms, each swivel arm pair carrying a saw blade assembly. The swivel arms are moved one after the other into the cutting position and immediately back into the rest position, so that after the first saw blade assembly has returned and the second saw blade assembly swings into the cutting position and after the cutting process has ended, it returns to the rest position.

According to a further embodiment, a plurality of these pairs of swivel arms can form a pendulum arrangement, in which case the transport path for the rollers is arranged below the central swivel axis of the swivel arms, that is to say runs between the machine frame.

Fig. 1

eine Seitenansicht der Sägemaschineneinheit;

Fig. 2

eine Vorderansicht der in Fig. 1 gezeigten Sägemaschineneinheit;

Fig. 3

eine schematische Darstellung der Position die die Sägeblattaggregate einnehmen können;

Fig. 4

eine seitliche Ansicht der Transporteinrichtung für die Sägeblattaggregate;

Fig. 5

ein Weg-Zeit-Diagramm für die Schwenkbewegung zwischen den Positionen A und B;

Fig. 6

eine seitliche Ansicht der Halterung der zu zerteilenden Rollen;

Fig. 7

eine seitliche Ansicht des Schwenkarmes;

Fig. 8

eine Pendelanordnung der Schwenkarmpaare;

Fig. 9

ein Sägeblattaggregat.

An embodiment of the invention is explained in more detail below with reference to the drawings. Show it:

Fig. 1

a side view of the sawing machine unit;

Fig. 2

a front view of the sawing machine unit shown in Fig. 1;

Fig. 3

a schematic representation of the position that the saw blade units can occupy;

Fig. 4

a side view of the transport device for the saw blade units;

Fig. 5

a path-time diagram for the pivoting movement between positions A and B;

Fig. 6

a side view of the holder of the rolls to be cut;

Fig. 7

a side view of the swivel arm;

Fig. 8

a pendulum arrangement of the pairs of swivel arms;

Fig. 9

a saw blade unit.

FIG. 1 shows a side view of the sawing machine unit 1 according to the invention. Supports 5 and crossbeams 6 are arranged on a base plate 3 and carry a transport device 20 (see FIG. 4) to be described.

A platform 24 is attached to the supports 4, on which the bearings 34 (FIG. 2) are arranged, which receive the central shaft 11. At the ends of the shaft 11, the swivel arms 7 are fastened, which have hydraulic or similar tensioning devices 19 at their free ends for the rotatable mounting of the saw blade assembly 8.

This saw blade assembly 8 consists of a mutually braced, large-area torsion tube unit (see FIG. 9) with a shaft 15, the ends of which are adapted to be received in the tensioning devices 19. Several saw blades 14 are mounted on this shaft 15 at a distance a. Instead of arranging the saw blades equidistantly, as shown, it is also possible to attach the saw blades to the shaft 15 at different intervals.

The shaft 15 is driven by a toothed belt 16 which runs via a toothed wheel 17 which is rotatably mounted on the shaft 11 and which is connected to a motor 23 via a toothed belt 18.

The shaft 11 is driven via a gearwheel 10 attached to it, which meshes with a corresponding gearwheel (not shown) of the drive unit 12. This drive unit 12 has clutch and brake devices, is continuously adjustable and is operated with direct current.

As can be seen in Figure 1, the shaft 15 and thus the saw blade assembly 8 moves on the circular path 9, on which it can be stopped in positions A, B and D (see FIG. 3). In the swivel range of the saw blade assembly 8, the holding device 2 for the long rolls to be divided or "trunks" 13 is arranged.

The operation of the sawing machine unit 1 is explained in more detail with reference to FIG. 3, which corresponds to FIG. 1, but the structural details have been omitted for the sake of clarity.

While the saw blade assembly 8 is moving from the cutting position A to the rest position B, the long rolls 13 are delivered from the paper processing system or from an intermediate store via a transport path 32 (see FIG. 6) and by means of a rake rake (not shown) above the device 2 pending.
After electrical or similar Command - triggered by reaching position B of the saw blade assembly - both long rollers 13 (or "trunks") fall into the correspondingly designed, highly smooth collecting half-shells 30.

The installed, multiple divided, tightly tolerated but centrally controlled, possibly individually spring-loaded hold-down device 29 (see Fig. 2, Fig. 6) are swung in and hold the "trunks" 13 at rest for the separation function.

The saw blade assembly 8 then moves almost vertically from position B to position A and separates the long rollers 13 (logs) to the specified or x-definable lengths, which the axial distance a of the saw blades 14 and the hold-down 29 and corresponds to the half-shells 30. A large number of individual roles are created at the same time.
FIG. 5 shows the path-time diagram of the swiveling movement between positions A and B.

Since the path-time diagram of this separating movement is designed to be "soft", an absolutely "clean" vertical multiple cut is created.
"Soft" means that the lowering of the unit (from B to A) is slower than the lifting. In the example shown in FIG. 5, the lowering is carried out within 1 second. performed while lifting in only 0.5 sec. he follows. When lifting, an additional smoothing of the saw cut is created. While the saw blade assembly 8 is moving in position B and remains there for a short time, the divided rollers are removed and two further long rollers 13 are brought into the holding device 2. The rake, which is already in the receiving position again during the removal of the divided long rolls or "trunks" from the sawing or separating area, then drops the "trunks" that have already accumulated on this after appropriate command onto the half-shells. The cycle, which lasts a maximum of four seconds, for example, now begins anew.
A cycle of 3.5 seconds in total Duration can look like this:
Falling of the 1st trunk 13 + closing the corresponding hold-down 29: 0.5 sec .;
Superimposed falling of the 2nd trunk 13 + closing of the corresponding hold-down 29: 0.3 sec .;
Lowering the saw blade assembly 8: 1 sec.
Lifting the saw blade assembly 8: 0.5 sec.
Opening the hold-down device 29: 0.2 sec.
Removing the split long rolls: 1 sec.

Although the theoretical service life of the saw blade assembly 8 is at least thirteen times greater than that of conventional sawing and cutting systems (service lives of up to one hundred or two hundred times the service life of conventional cutting units are possible), the cutting quality of the special saw blades 14 deteriorates after a correspondingly long time to be recorded.

If this is determined fully automatically by the operator or by appropriate measuring devices, the saw blade assembly 8 is moved from item A or B to item D by means of a corresponding command. There the hydraulic or similar trained bearing clamping device 19 opened. The entire special multiple saw blade assembly 8 is moved from item D to item C via a transport device 20 which rises vertically upward from the previously lowered area there (FIG. 4).

The transport device 20 consists of a circulating chain 21 with half-shells 22, in which the ends of the shaft 15 of the assembly 8 rest.

In item C, the entire unit can be overhauled using a hoist, crane or similar. be driven to the maintenance department, which has conveniently set up a maintenance / repair station directly on site.

At the same time, the fully functional, new, special multiple saw blade assembly 8, which was previously given up in item E, is moved from item E to item D by the same transport device 20.

There, this new unit is taken over by the opened tensioning device 19 and driven directly into position A or position B with it. A maximum of 30 seconds including the start of separation is required for the described replacement cycle of the special multiple saw blade units.

With e.g. existing "trunk storage" this is an insignificant time. If the sawing machine unit 1 or units are acted upon directly by the paper processing machines previously located in the production process, this means a brief, fully automatically controllable throttling of the processing speed or a brief standstill of a maximum of 30 seconds in total.

A transport memory (not shown) can also be assigned to the transport device 20, in which prepared, ready-to-use saw blade units 8 are stored, which can be removed by simply actuating a selection device and fed to the sawing machine unit for use.

It should also be mentioned that all saw blade or cutting units are external - depending on the need, of course - e.g. optimally lubricated and cooled with silicone spray.

In Figure 6, the bracket 2 for the long rollers 13 is shown in detail. The rollers 13 are delivered via the conveyor belt 32 and - as described above - placed in the support trays 30. The number and the width of the support shells, which are axially spaced apart, depend on the number and the distance of the saw blades 14.

A single platen can - as shown in the left part of Fig. 6 - be provided with a slot 38 so that the pushers, which are attached to a circumferential belt 37 via a holder 36, can be moved in the direction of the axis of the paper rolls.

All pushers 35 combined in this way to form a "pusher chain system" remove the entire, then already divided long rolls or "trunks" based on an equally "soft" path-time diagram, as well as slightly open hold-down devices 29, from the saw after a corresponding command - or separation area.

In the right part of FIG. 6, the shells are designed as quarter shells 30a, 30b, which can be opened downwards, so that the divided rolls fall into conveyor containers 33, which are arranged on a conveyor belt 39 and are transported away either in the longitudinal direction (arrow direction) or in the transverse direction will.

The outer saw sections created on both sides of the separate long rolls or “trunks” are removed by known, conventional methods. It should be noted that these sections are largely minimized compared to conventional plants, which results in a reduction in rejects.

FIG. 7 shows a special embodiment of the swivel arm 7. This carries a counterweight 25 via the arm 27 (see also FIG. 2). As a stop for pivoting into the cutting position A, an air damping element 26 is provided, which is fastened to the support 5.

If necessary, a conventional grinding device 28 can also be provided in the rest position B is adjustable or controllable by inspection. It is also possible that an adjustable regrinding device in item D is also taken over.

A total of six pairs of swivel arms 7 are combined in FIG. 8 to form a pendulum arrangement, each pair of swivel arms 7 carrying a saw blade assembly 8. The logs 13 to be cut are located below the axis 11 in this arrangement. In operation, the entire arrangement can perform a pendulum movement, i.e. the saw blade assembly in position A is pivoted back and forth between the rest and cutting position as in the arrangement shown in FIG. 3, or the entire assembly is rotated further in the direction of the arrow after cuts have been made, so that the next saw blade assembly performs the next cuts.

FIG. 9 shows the structure of the saw blade assembly 8 in detail. A number of saw blades 14, which have a plurality of openings 40 arranged on a circle, are arranged to form a saw blade assembly 8, the distance between the saw blades 14 being determined by the length of the tube pieces 41. These pipe sections 41 have pins 45 and openings 42 which are arranged on the end face of the pipe sections. The pins 45 reach through the openings 40 of the respective saw blade 14 and are inserted into the corresponding openings 42 of the pipe section 41 located on the other side of the saw blade 14. In this way, the entire saw blade assembly is plugged together, whereby any desired saw blade arrangement can be built up by appropriate selection of the tube pieces 41.

The end pieces 43 form the end. The entire arrangement is fixed and tensioned by means of tie rods 44.

It should be mentioned again that in the event of a total failure of the sawing machine unit or units, a short-term switchover to the conventional sawing or cutting units which are usually present in existing systems is possible. Of course, this can also be automated.

Claims (10)

1. A device to fractionize rolls (stems) (12) of a ware in the form of tapes or foils, preferably paper, being wound up on mandrels, into rolls of a smaller axial width by means of circular saw-blades being rotated and led through the rolls (12) to be cut, characterized by
a modular sawing machine unit (1) which can be laid out to a transporting line for the rolls (13) to be cut, having at least two swivel arms (7) being swivel-mounted and regulatively driven and having a saw-blade aggregate (8) with a plurality of saw-blades at their free ends, the saw-blades being arranged one from another with the axial distances (a) corresponding to the desired axial width of the rolls to be made, whereas, for the rolls (13) to be cut, collecting and supporting dishes that must be incorporated into the transport line (32) are mounted laterally beside and beneath the central swivelling axis (11) of the swivel arms (7).

2. A device according to claim 1, characterized in that said swivel arms (7) are regulated thus that lowering the saw-blade aggregate (8) into sawing position A happens slower than lifting from said sawing position A into retiring position B.

3. A device according to claim 1 or 2, characterized in that the saw-blade aggregate (8) comprises tube pieces (41, 43) that can be put together and between which the saw-blades (14) are arranged, and that the joined tube pieces (41, 43) and saw-blades (14) are fixed by means of a tie rod device (44).

4. A device according to one of the claims 1-3, characterized in that pusher (35) are laterally attributed to said supporting dishes (30) which remove the devided rolls from the supporting dishes (30).

5. A device according to one of the claims 1-3, characterized in that the collecting and supporting dishes (30) are developed as diverging quartered dishes (30a, 30b) to let pass the devided rolls downwards in case that the quartered dishes are diverged.

6. A device according to one of the claims 1-5, characterized in that swivel-mounted holding down appliances (29) are assigned to the collecting and supporting dishes (30) on the rolls (19) to be devided.

7. A device according to one of the claims 1-6, characterized in that above the central swiveling axes (11) of the swivel arms (7) a transporting device (20) for the conveyance and removal of the saw-blade aggregates (8) is mounted, the swivel arms (7) seizing in vertical position (Postition D) between the parts of said transporting device (20) in order to receive or deliver the saw-blade aggregates (8).

8. A device according to claim 7, characterized in that a program register for prepared saw-blade aggregates (8) of different kind being ready for use are assigned to the transporting device (20).

9. A device according to one of the claims 1-8, characterized in that the sawing machine unit (10) comprises several pairs of swivel arms (7), each bracket pair carrying a saw-blade aggregate (8).

10. A device according to claim 9, characterized in that at least two pairs of swivel arms (7) form a pendulum arrangement.

Images