Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F7/00—Other details of machines for making continuous webs of paper
  • D21F7/001—Wire-changing arrangements

Definitions

• the invention relates to equipment for installing a fabric loop in a fabric cycle of a web forming machine or for removing a fabric loop from a fabric cycle, around which equipment the fabric loop is adaptable mainly into the replacement geometry of the fabric cycle in connection with its installation or removal, and which equipment includes - a frame and
• the invention also relates to a corresponding arrangement, method and use of the equipment for handling a fabric loop.
• Fabric replacement devices require design work and their design is cost-intensive and prone to errors .
• a replace- ment device for a transfer belt equipped with wheels is described in a Finnish patent application, Publication No. FI991171 filed by the applicant (corresponding PCT publication WO 00/71814) .
• the device can be driven to inside a paper machine.
• problems are associated with the replacement device relative to both the device use and fabric handling.
• the object of this invention is to provide equipment for installing a fabric loop in a fabric cycle of a web forming machine or for removing a fabric loop from a fabric cycle, which equipment, for example, multiplies the number of fabric cycles that can be handled with one and the same equipment .
• the invention accelerates fabric handling and improves the work safety related thereto.
• the characteristic features of the equipment according to the invention are set forth in claim 1, those of the arrangement in claim 9, and those of the method in claim 12.
• the invention also relates to the use of corresponding equipment for handling a fabric.
• the frame is adaptable in a lifting device with which the position of the frame is arranged to be adjustable in the vertical direction, and the position of at least one support relative to the frame is arranged to be changeable with an arm assembly for adapting the fabric loop to the replacement geometry of the fabric cycle and thus for installing or removing the fabric loop irrespective of the replacement geometry of the fabric cycle.
• the position of the supports can be changed irrespective of each other.
• an individual position of one's own can be specified for each of them.
• the position of the supports can be changed so that each support can be placed, for example, in one of the corners of a fabric cycle replacement geometry.
• the frame can include one or more blocks to which the arm assemblies are fastened.
• a lifting device can be used to adjust the position of the frame and thus the installation height of a fabric loop in the vertical direction.
• handling of a fabric loop can be easily performed with the same device even in the fabric cycles located in high positions.
• the support constructions, and possibly the frame as well can be telescopic. This, too, provides several benefits.
• the size of the equipment can be varied, which enables its easy storing and additionally handling of fabric loops with various widths. Also, thanks to this feature, the equipment is easily arrangeable within a fabric loop.
• the fabric replacement devices become standardized and the speed, safety and usability of replacement operations improve.
• Figure 1 shows equipment according to the invention with the telescopic parts retracted, and a lifting device adaptable thereto
• Figure 2 shows equipment according to the invention with the telescopic parts extracted, and a lifting device adapted in the equipment
• Figures 3 and 4 are perspective views of the equipment as seen from various directions with a fabric adapted around the equipment
• Figure 5 is a perspective view showing the replace- r ⁇ ent of a fabric loop to the top pos ition using equipment according to the invention
• Figures 6a and 6b are s impl i f ied cros s -s ectional views of equipment according to the invention for controlling the loose parts of a fabric in connection with the equipment
• Figure 7 is a simplified cross-sectional view of equipment according to the invention when applying more than one frame block
• Figure 8 shows an exemplifying application of another l i f t i ng dev i c e t o wh i ch the f r ame i s adapted .
• FIGS 1 - 5 show one implementation method for equipment 10 according to the invention.
• the fabric loop 11 is easy and safe to handle when replacing it in e.g. a paper machine 12 or similar.
• paper machines 12 have several fabric cycles in various positions, the shapes of which may differ greatly from each other.
• Figure 7 shows one simplified example of elements 13.1 - 13.5 defining a fabric cycle, being in this case exclusively rolls, just to provide an example.
• the replacement geometry 14 of a fabric cycle as seen from the side of the paper machine 12 can be defined by rotating components, for example, such as rolls or cylinders 13.1 - 13.5, via which the fabric loop 11 is designed to cycle in the machine.
• the rotating components 13.1 - 13.5 are normally inside the fabric loop 11, but some may also be outside the loop 11.
• the components 13.1 - 13.5 or the opening points created in the machine 12 frame can also be, when looking at the machine 12 from the side, at least partly at two or more levels relative to each other, both in the vertical and horizontal directions. In connection with the handling operation, it may thus be necessary to support the fabric loop 11 at various points both in the longitudinal and vertical directions of the machine.
• the replacement geometry 14 of a fabric cycle can also be defined, for example, by various control and conditioning equipment for the fabric loop comprised in the machine. Examples of these can comprise various cleaning devices, suction devices and stretching equipment. The devices can thus be either inside the fabric loop or even outside of it.
• the replacement geometry 14 of a fabric loop can also be defined by locations in the machine 12 frame that are openable in one way or another or ready open. At these locations, the fabric 11 can be taken inside the machine 12 or removed from the machine 12, i.e. from between the frames.
• the machine has fabric cycles throughout its entire length, from end to end, such as, for example in the forming section, in the press section, in the dryer section, and in the calender.
• a fabric loop can be a fabric, felt, metal belt, transfer belt or poly- meric belt, for example; this is in no way restricted by the invention. Generally, it is possible to speak about an endless closed loop regardless of its manufacturing material or method, position or function in the web forming machine.
• FIGS 1 and 2 show an example of equipment 10 according to the invention for handling a fabric loop in connection with maintenance operations of a web forming machine.
• the equipment 10 is shown without the fabric loop.
• the equipment 10 comprises a frame 15 and moving elements 16.1 - 16.4, 17 arranged in connection with it, protruding radially from the frame 15.
• the frame 15, which can support the main part of the mass of the fabric handled can consist of a lattice structure, known as such, of a tower crane type, for example, which can have e.g. a rectangular cross- section.
• a cage-like frame 15 can be equipped with wheels, which allow moving it in the machine and cross-machine directions, for example, without an actual transfer device.
• the frame can be very light, simply a bar-like construction, for example.
• a fastening frame construction can be arranged in connection with the bar ends for the radially extruding moving elements 16.1 - 16.4.
• the purpose of the bar construction is to keep the support frames at a desired distance from each other so that the elements 16.1 - 16.4 at each end of the bar are in a uniform arrangement.
• the moving elements 16.1 - 16.4, 17 arranged in the frame 15 can be used to set the equipment 10 into the replacement geometry 14 of the fabric cycle for installing a fabric loop 11 in the machine 12 or for removing it from the machine 12 (for a metal belt, for example) .
• the ability to customize the elements 16.1 - 16.4, 17 irrespective of each other provides, for example, the surprising advantage that one and the same equipment entity 10 can in practice be used to take care of handling of all fabric loops in each of the machine's lateral fabric cycle replacement positions irrespective of the width of the fabric loop, for example, or generally of the replacement geometry 14 of the fabric cycle.
• Moving elements comprise at least one arm assembly entity 16.1 arranged movable relative to the frame 15.
• the arm assembly 16.1 can be at both ends of the frame 15.
• arms can be provided even between the ends of the frame 15, in case it is necessary for some reason
• the movement of the arms 16.1 - 16.4, the number of which is now four in this embodiment (two on both sides of the frame 15) , relative to the frame 15 can be very versatile considering the basic idea of the invention.
• the arms 16.1 - 16.4 are provided with a pivoting mechanism 22 located in their fastening points relative to the frame 15. Pivot points can be provided even elsewhere in the arms, or they can be located, instead of the fastening points relative to the frame 15, in an extension arm protruding from the frame 15, for example.
• the frame 15 can have flange-like lugs for fastening and pivoting the arms 16.1 - 16.4 to the frame 15.
• a hydraulic cylinder 25 can be placed 5 between a point suitably selected from the arm assembly 16.1 - 16.4 and the frame 15 for turning the arm assembly 16.1 - 16.4 ( Figures 6a and 6b) .
• the cylinders are omitted from Figures 1 - 5.
• At least one elongated support pole 17 parallel with the frame 15 is arranged in each arm assembly 16.1 - 16.4 for the fabric loop 11.
• the position of at least one support 17 relative to the frame 15 is arranged to be modifiable with the arm assembly 16.1 for adapting the fabric loop 11 to the replacement geome-
• the support 17 can be an elongated tubular beam which is used for supporting the fabric loop 11 in a desired vertical-horizontal position. Its surface can be, for example, Teflon or other similar low-friction material. The cylindrical roundness of the support 17 provides smooth move-
• the cross-sectional dimensions of the support 17 can be, for example, equal to those of the roll located in the x-y position corresponding thereto, or smaller, or the support can be even a larger pipe.
• the support 17 can consist of an extendable tubular beam being thus telescopic.
• the frame 15 can be of a telescopically extendable type.
• the number of telescopic extensions can be 1 - 6, in which case the basic length of the frame
• 30 15 can be, for example, 2 - 6 m, when retracted.
• Figure 1 the frame 15 and the support booms 17 are shown in their retracted position. With a telescopic arrangement of the frame 15 and the supports 17 the size of the equipment 10 can be made surprisingly small. This facilitates storing the equipment 10
• the arrangement of the fabric loop 11 requiring handling around the equipment 10 and its removal from the equipment 10 is very easy thanks to the telescopic feature .
• Another advantage provided by the telescopic feature is that the equipment 10 can be used for handling fabrics of various widths .
• the arm assembly 16.1 - 16.4 can also be telescopically extendable due to which it provides the movability of the poles 17 relative to the frame 15.
• the number of telescopic extensions 23 is three in each arm assembly 16.1 -
• each support boom 17 can be moved irrespective of each other to a suitable position conforming to
• the replacement geometry 14 of the fabric loop (for example, a curve/corner/turning point, a frame opening in the fabric loop replacement geometry 14).
• Moving the adjustable elements 16.1 - 16.4, 17 of the equipment 10 both telescopically and turnably can be achieved by means of actuators arranged in connection
• the actuators can be medium-actuated, such as hydraulic or pneumatic cylinder actuators.
• a manual drive, realized with a winch mechanism, for example, is naturally also possible.
• the arrangement of actuators 24, 25 provided in the arm assemblies 16.1 - 16.4 is illustrated in a
• the frame 15 is removably connectable by its end to a lifting device 18, which is shown as one application example in Figure 1 separated from the frame 15, and in Figures 35 2 - 5 attached to the frame 15.
• the lifting device 18 can be, for example, a goods hoist equipped with wheels known as such, such as, for example, a lift truck.
• the frame 15 of the equipment 10 can also be without wheels and its transfer can be performed solely with a lift truck.
• the lifting height of the lifting device 18, 6 - 8 meters, even 10 meters, can be mentioned.
• the invention relates as well to a lifting device 18, which is suitable for using fabric replacement equipment 10 according to the invention.
• the lifting device 18 can also be used to change the position of the frame 15 in the vertical direction, as can be seen in Figure 5.
• the equipment 10 can be attached, for example, to the telescopic lifting boom 26 of the lifting device 18.
• the frame 15 with supports 17 can be set to a suitable height steplessly and easily taking into account the height of each fabric cycle replacement geometry (vertical arrow) .
• the actuators of the equipment 10, such as, for example, the cylinder actuators 24, 25 of the arm assemblies 16.1 - 16.4 and the means providing the telescopic movement of the frame 15 and the support poles 17, can be connected, according to one embodi- ment, to the hydraulic system of the lifting device 18.
• the equipment 10 itself need not necessarily be provided with a hydraulic aggregate at all, which simplifies essentially its implementation .
• Figures 3 - 5 show some embodiments for installing a fabric 11 in a press section of a paper machine 12. It should be noted that all rolls or generally the functional parts of the machine 12 are not shown in the figures for clarity.
• the method and arrangement according to the invention are also described for handling a fabric loop 11 in connection with a web forming machine 12, thus more particularly outside the machine 12, using equipment 10 according to the invention.
• the equipment 10 can be in its arrangement shown in Figure 1, i.e. with the telescopic parts retracted.
• the arms 16.1 - 16.4 with the booms 17 can be in a position following closely the frame 15, in which case the main cross-section of the equipment 10 is defined by- its frame 15.
• the fabric 11 designed to be supported around the frame 15 of the equipment 10 can be unwound, for example, in front of the end of the frame 15 on the side that is without the support of the lifting device 18, supporting at the same time the fabric 11 with an overhead crane, for example.
• Unwinding can be performed, for example, using an unwinding device 20 known as such.
• the frame 15 with the booms 17 is taken to its length defined by the fabric using the telescopic mechanism.
• the telescopic mechanism 23, 24 extends the arms 16.1 - 16.4 and the angle adjustment mechanism 22, 25 changes their angle irrespective of each other relative to the frame 15.
• the area of the cross-section defined by the extreme points of the equipment 10, seen from the end of the equipment 10 increases.
• the unwindable fabric loop 11 can be controllably supported around the frame 15, mainly on its sides, so that it will not hang free to a great extent.
• the frame 15 itself can also support the fabric loop 11 at one point, in which case the top surface of the frame 15 can also be equipped with a sliding/support surface.
• the frame 15 that can be used to support the main part of the mass of the fabric loop 11, and the frame can also form the upper- most support point in the cycle corresponding to the fabric loop 11 and thus also the main guide when transferring the fabric 11 to the machine's fabric cycle replacement geometry 14 as well as when transferring it back towards the equipment 10 from the fabric cycle replacement geometry 14.
• 3 and 4 can be arranged as desired relative to the equipment 10.
• it can be connected beside the equipment 10 such that its distance to the frame 15 of the. equipment 10 is constant in the longitudinal direction of the frame 15.
• the unwinding device 20 can also be fitted with wheels 20' of its own, in which case it is not at all connected to the equipment 10.
• the connection can additionally enable the movability of the unwinding device 20 in the longitudinal direction of the frame 15.
• the unwinding device 20 is outside the fabric 11.
• the unwinding device 20 can be supported with an overhead crane, for example, at its ends beside a fabric handling device 10 that is clearly lifted from the floor level. In both cases, both unwinding ends of the fabric 11 are released from the same side, as is clearly shown in Figure 3.
• the unwinding device 20 can be of a type known in prior art.
• the unwinding device 20 can have, for example, at its ends means 20' moving with wheels connected to the pole 20* of the fabric 11, having a mechanical brake, for example, for limiting the unwinding of the pole 20*, and a sliding surface.
• the next stage can consist of trying on the equipment 10 in a position corresponding to the replacement geometry 14 of the fabric cycle beside the machine 12 and possibly anchoring it in place and/or possibly fastening to the machine 12. This condition is illustrated in Figures 3 - 5. Unwinding is carried out to such an extent that the fabric loop 11 can be supported by the arms 16.1 - 16.4 with poles 17 around the frame 15 of the equipment 10 in the main cross- sectional shape of the fabric cycle replacement geometry 14 or even slightly larger than the fabric cycle replacement geometry
• the X-Y direction is the vertical-lateral direction when looking at the machine in the lateral direction.
• the arms 16.1 - 16.4 can be used to make the shape of the fabric loop 11 around the frame 15 of the equipment 10 such that it is slightly larger than the fabric cycle replacement geometry 14 defined by the rolls or the machine frame, for example, to which the fabric loop 11 is to be transferred from the equipment 10.
• the frame 15 is lifted to a suitable height with the lifting device 18 in such a way, for example, that its top surface corresponds to the top-most position of the fabric cycle replacement geometry 14.
• the sup- port booms 17 can be moved to correspond to the top-most extreme point defining the fabric cycle replacement geometry 14.
• the following operation consists of transferring the fabric 11 from the equipment 10 to the fabric cycle replacement geometry 14. In this, several different transfer methods can be applied.
• a first method is to draw one or more wires from the back side of the machine 12 (not shown) through the machine 12 to the front side, where the equipment 10 and the fabric loop 11 set thereupon are located.
• the ends of the wires are fastened to that edge of the fabric loop 11 at which the frame 15 is free, i.e. without support (being the edge opposite to the frame 15, relative to the lifting device 18, on the paper machine side) .
• the fabric loop 11 is transferred from top of the equipment 10 to the fabric cycle replacement geometry 14, for example, to surround the rolls defining it, by drawing it e.g. manually from the back side with wires (horizontal arrow in Figure 5) .
• FIG. 2 shows another embodiment for leading the fabric loop 11 in the cross direction of the machine 12 from the equipment 10 to the fabric cycle replacement geometry 14.
• the equipment 10 can be provided with guide arms 21.
• the guide arms 21 can be extractably and rectractably located in each support 17, for example, or at least in part of them.
• the fabric loop 11 is grabbed at the edge with the guide arms 21, after which the guide arms 21 transfer the loop 11 from the position corresponding to the fabric cycle replacement geometry 14 to inside the machine 12.
• Slim telescopic guide arms 21 fit well in narrow machine element inter- vals and draw the loop 11 edge until to the back side edge. After this the arm 21 ends are detached from the fabric loop 11 and the arms 21 are drawn back to within the booms 17 while the fabric loop 11 remains in the machine 12.
• the lifting device 18 can be used as the drive power source for the guide arms 21 as well.
• a fabric loop 11 that is sufficiently rigid in the cross direction of the machine 12, such as, for example, a metal belt, can be surprisingly even pushed to the machine 12 to the cycle replacement geometry 14.
• the equipment 10 frame 15 can comprise at least one wire 27 ( Figure 2) running twice over in the frame 15 from end to end.
• a roller wheel 28 or similar element can be provided at one end of the frame 15, being now the freely hanging end of the frame 15, which reverses the travel direction of the wire 27.
• means for changing the length of the wire 27, such as, for example, a winch mechanism 29, can be provided.
• the wire 27 leaving the winch 29 can run the first interval from the supported end of the frame 15 to the freely hanging end within an elongated frame beam, for example.
• the wire part returning from the roller wheel 28 to the end on the side of the lifting device 18 can run, for example, between the frame 15 and the fabric loop 11 lying on top of it conforming to the shape of the frame 15.
• the end 35 of the wire 27 can be attached to the edge of the fabric loop 11 on the side of the lifting device 18. After this the wire 27 is reeled with the winch 29, whereupon the wire 27 draws the rigid fabric loop 11 connected thereto towards the machine 12. As the fabric loop 11 has been shaped, lifted and set ready in the fabric cycle replacement geometry 14 with the equipment 10, the loop 11 is transferred from the equipment 10 to the fabric cycle replacement geometry 14. When the wire 27 end 35 reaches the freely hanging end on the roller wheel 28 side in the frame 15, the fabric loop 11 has been pushed in place in the machine 12 and the wire 27 end 35 can be detached from the edge of the loop 11.
• the frame 15 of the equipment 10 when taking the fabric 11 to the machine 12, can be lifted even to a slightly higher position than would be required by the actual fabric cycle replacement geometry 14.
• the long frame, free at its machine 12 side end, is inclined in a small angle towards the machine 12.
• An angle can also be provided using the tilting feature 30 of lifting boom 26 of the lifting device 18 ( Figure 1) .
• the fabric 11 to be transferred to the machine 12 can be inched/drawn to a slightly downward slope while simultaneously drawing/pushing it to the machine 12, which inclination facilitates the fabric installation for its part.
• the boom 26 inclination 30 of the lifting device 18 can also be applied when removing the fabric 11 from the machine 12.
• the possible unwinding device 20 can also be transferred inside the machine 12. It should be noted that the equipment 10 itself is not pushed into the machine 12 for the main parts 15, 17.
• the machine 12 constructions are fitted with an opening in the cross direction of the machine 12 and guides for the unwinding device 20, where the fabric loop 11 can be finally unwound for stretching.
• the unwinding device 20 is drawn out from inside the machine 12 and the final stretching in place of the fabric loop 11 is carried out using the lead and stretcher rolls of the fabric 11.
• the equipment 10 according to the invention when applying the invention to a metal belt, for example, can be used, besides in the installation of a fabric 11, also for removing a fabric loop 11 from a fabric cycle replacement geometry 14 of a web forming machine 12.
• the operation can be performed, for example, by moving the equipment 10 beside the machine 12 and taking its arms 16.1 - 16.4 provided with booms 17 to an arrangement corresponding to the fabric cycle replace- ment geometry 14 in a similar way as when installing the fabric 11 in the machine 12.
• the fabric loop 11 can be drawn out of the cycle replacement geometry 14 to surround the equipment 10 frame 15 and the boom beams 17.
• the fabric 11 can be removed from the equipment 10, for example, in reversed order compared to its arrangement on top of the equipment 10 in the embodiment described above. Finally, the fabric loop 11 can be made into a compact double roll using the rewinding feature of the unwinding device 20.
• Figures 6a and 6b show some further embodiments of the equip- 5 ment 10 at a very basic level as seen from the end.
• the equipment 10 comprises means 19 for holding together the loose part 11' of the fabric loop during handling. Particularly when installing a fabric loop 11 in top positions, the extra part 11 ' of the fabric loop 11 can be folded on top of the equipment
• the elements 19 can be composed of, for example, presses or similar, which can be used to release the supported fabric loop 11 quickly and easily from the equipment 10.
• the number of presses 19 can be e.g. three at both edges, of which two pairs are located at the ends of the fold
• the folds 11' can also function as reinforcement when pushing the fabric loop 11 to the machine using the means 27 - 29, 35 of the equipment 10 ( Figure 2) .
• Figure 7 shows an extremely simplified view of another embodiment of the equipment 10 according to the invention. If the replacement geometry 14 of the fabric loop extends to a remarkably large area for example in the longitudinal and/or vertical direction of the machine 12, according to one embodiment, the
• 25 frame 15 of the equipment 10 can be composed of at least two frame parts 15.1 - 15.3, which can be at different heights in the vertical direction as well.
• One application for this kind of frame construction could be a fourdrinier former, for example.
• the basic design of the equipment units 10 can then be,
• the frames 15.1 - 15.3 can be connected to each other such that they are set at a distance from each other in the vertical or longitudinal direction of the machine.
• the frame blocks 15.1 - 15.3 can be connected to each other such that they are set at a distance from each other in the vertical or longitudinal direction of the machine.
• the frame blocks 15.1 - 15.3 can be connected to each other such that they are set at a distance from each other in the vertical or longitudinal direction of the machine.
• the frame blocks 15.1 - 15.3 can be connected to each other such that they are set at a distance from each other in the vertical or longitudinal direction of the machine.
• the frame blocks 15.1 - 15.3 can be connected to each other such that they are set at a distance from each other in the vertical or longitudinal direction of the machine.
• 35 15.1 - 15.3 can also be unconnected.
• machine-directional connection beams can be used, which can be telescopic as well.
• a long telescopic extension is not required of the arms 16.1 - 16.4 and the constructions are more lightly stressed also otherwise.
• FIG 8 shows another embodiment of the lifting device 18, which is adaptable or even integrated as a part of the equipment 10 according to the invention.
• the support poles and their arm assemblies are not shown at all in Figure 8.
• the lifting device 18 is based on a scissors mechanism 31.
• the frame 15 can be made very compact and the device 10 fits in a standard container.
• the frame components of the scissors assembly 31 can be made similar in design achieving thus the advantages of serial production.
• the scissors mechanism is arranged to be hauled along a rail 32 provided in the carriage 18, in which case its movement is smooth and, on the other hand, lockable at a desired height.
• the bottom part of the carriage 18 forms a "housing" for the frame 15, which makes the entire equipment 10 very compact and regular in shape with the scissors mechanism 31 folded together.
• the actuator accessories (i.e. possible batteries, actuator hydraulics or pumps) of the equipment 10 can also be located over a longer distance in connection with the bottom part.
• the control of the lifting device 18 is easily implementable.
• the rear wheel (s) of the equipment 10 can turn, which allows easier access to beside the machine 12.
• Naturally even all the wheels can be steering.
• the lifting device 18 can additionally comprise support paws 33 on its sides, for example, opening in a Y shape arrangement, for instance.
• the movement of the support paws 33 including the arms can be versatile allowing thus to adapt the center of gravity of the entire system according to the fabric position/fabric handled at each time.
• the extra length of the fabric 11 can be folded on top of the equipment 10.
• the ceiling of the frame part 15 can be made of a continuous plate to support the weight of the fabric 11 and to facilitate installation of the fabric 11 in the machine 12.
• the equipment 10 according to the invention can also be pro- vided with intelligence.
• the equipment 10 can be equipped with processor and memory means CPU, MEM. These can be used, for example, for the purpose of storing the handling data of the fabric loop 11 and further for controlling the equipment 10 according to the stored handling data.
• processor and memory means CPU MEM.
• MEM memory means
• the independent position of the equipment 10 and its elements 16.1 - 16.4 can be stored with a button press in the memory MEM to conform to the fabric cycle replacement geometry 14 concerned.
• even the position of the equipment 10 in the machine hall can be stored in the memory MEM.
• the supports 17 of the equipment 10 can be immediately taken to the correct "geometry" using the data retrieved from the memory MEM with automatic control performed by the proces- sor CPU, which has an essential effect on the speed of handling.
• the fabric loop can be handled for example in a triangular fabric cycle replacement geometry position.
• One arm with booms can thus define one of the corners of the fabric cycle replacement geometry, while the frame corners of the frame 15 can form the other two corners of the fabric cycle replacement geometry.
• the frame 15 can be telescopic also in its vertical and/or lateral direction.
• the invention can also be applied in connection with a fabric introduction device set forth in Finnish patent No. FI-103421B filed by the applicant.
• this type of introduction device is located in the bottom part of the fabric loop.
• the replacement equipment 10 according to the invention can be used to stretch the bottom part of the fabric 11 straight by means with the support arms 16.1 - 16.4 of the equipment 10. This leads to the advantage, for example, that the fabric 11 enters the introduction device reliably without folds.
• the equipment 10 is so adjustable that the fabric 11 can be supported around it in the desired fabric cycle replacement geometry, or generally in such a shape which enables a fabric replacement in a web forming machine 12.
• the shape of the equipment 10 is changed with elements 16.1 - 16.4 protruding from the frame 15 to its sides and/or above/beneath, arranged movable relative to the frame 15, even the frame 15 itself can be moved, on the other hand.
• a boom 26 of a goods hoist 18 equipped with a rotator can be used, allowing to turn the frame 15 to a desired arrangement and adjust the poles 17 thereafter to suitable arrangements using the arms 16.1 - 16.4.
• fabric cycle replacement geometry can be unders tood very widely in connection with the invention .
• the rol ls through which the fabric 11 cycl es during the operation of the machine 12 would define the replacement geometry of the fabric cycle .
• the frame constructions of the machine 12 can also be unders tood as points def ining the fabric cycle replacement geometry 14 expressly as regards the replacement of the fabric 11 .
• i t is also pos s ible to speak about an opening which is created on the side of the machine 12 when in the fabric replacement position.
• the fabric loop 11 can be taken inside the machine or removed from the machine e . g . through some other cantilevering position, such as , for example, defined by the frame constructions , which is not necessarily exactly at the roll in all positions .
• some other cantilevering position such as , for example, defined by the frame constructions , which is not necessarily exactly at the roll in all positions .
• the fabric loop 11 is trans ferred, at least in some positions , in the longitudinal and/or vertical direction of the machine in order to take it to the final on- the-run traveling cycle . In addition, it must be further under-
• the term ' web forming machine ' is used to refer to paper, board, tissue or pulp machine, for example .

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