EP0158281B1 - Fabrics lay-down machine - Google Patents

Description

The invention relates to a fabric laying machine with a laying trolley which is motor-driven along a support and which has a laying trolley and a laying trolley frame arranged above it and displaceable relative to it by means of drive devices and rotatable about a vertical axis of rotation and having a laying trolley top held on the laying trolley top Storage device for a web roll and a drive device for unwinding the stock roll, with a feed roller rotatably mounted on the laying carriage frame with an axis parallel to the storage roll, which can be driven in accordance with the traveling speed of the laying carriage, and a laying unit held on the laying carriage frame for deflecting and cutting off the web.

In the fabric laying machines described, the material web is laid out in the form of individual layers lying one on top of the other, so that a so-called layer stack is created, in the simplest case neither having to pay attention to the laying direction nor that the same side of the material web points in the direction of the support. However, pair laying is a special type of laying.

In this method, a web having a first side and a second side is designed such that the first side of the next layer lies on the first side of a layer and the second side of a subsequent layer lies on the second side of a layer is coming. I.e. the layer stack is then constructed so that the first sides and the second sides of the individual sheets lie one on top of the other. In addition, when pairing it must be taken into account that the fabrics in general also have a "dash", i.e. H. have a preferred direction, so that the individual layers must always be laid out in the same laying direction and, for example, zigzag laying is not possible.

Pair laying is thus a very complex laying process, since after laying out each layer the fabric must be turned so that when laying out the next layer in the same laying direction as the first layer, the web is reversed. This turning of the fabric should take place as quickly as possible to save time, and therefore the users place increasing importance on the fact that this turning of the fabric takes place as automatically as possible in a fabric laying machine. Furthermore, in order to save time, it is also generally required for fabric spreading machines that the material web unwound from the supply roll is automatically introduced into a spreading mechanism, i. H. is threaded. It must also be taken into account here that the supply rolls can be wound with different directions of rotation, so that for such automatic threading, the material-laying machine should be designed in such a way that a different unwinding direction does not cause any problems during automatic threading.

DE-OS-2 922 930 discloses a fabric laying machine which is suitable, inter alia, for pair laying and which also automatically threads. This comprises a laying trolley with a laying trolley frame and an upper part of the laying trolley which is arranged above it and which can be displaced transversely to a laying direction by means of drive devices and rotates about a vertical axis of rotation and on which the web roll, the preselecting roller and the laying unit are held. To thread the web, the supply roll is displaceable in the laying direction and is positioned over the feed roller so that the web hanging from it runs on one side of the feed roller. The supply roll is then shifted in the laying direction so that the web lies over the feed roller and forms a freely sagging loop on the opposite side of the feed roller. In the threaded state, the web of material hanging from the supply roll thus forms a loop, runs from it over the feed roller and from the side of the feed roller opposite the loop to the laying unit.

When a fabric is laid in pairs, the entire top of the laying trolley, including the supply roll, presetting roller and laying unit, is rotated by 180 ° after laying out each layer. The laying unit must be designed so that it can be laid in two opposite directions, since otherwise the individual layers could not be laid out in the same laying direction.

The disadvantage of the spreading machine according to DE-OS-2 922 930 is that a laying table of such a spreading machine must be so large that it overlaps on both sides of the stack of layers by at least the width of the spreading machine, because it rotates due to the The upper part of the laying carriage, together with the laying unit, is required so that this fabric laying machine can travel beyond the stack of layers on both sides. Another disadvantage is that by rotating the laying unit together with the upper part of the laying trolley, the side on which the assembly sets out the material web is constantly changing, making it difficult for an operator to observe the material web being laid out, for example to check for errors. This is particularly the case when the laying unit extends the web of material - seen in the direction of travel - in front of the laying car and the operator can only check a part of the web that is visible behind the laying car, so that faulty areas are also cut out is much more difficult.

Another disadvantage is the fact that with different unwinding directions of the supply rolls, a different positioning of these supply rolls over the feed roller is necessary, since depending on the unwinding direction, the web hangs on opposite sides of the axis of rotation of the supply roll and therefore a different distance by the thickness of the supply roll from the default roller.

Another, already known fabric laying machine does not have these disadvantages. In this, both the laying unit and the pre-setting roller are firmly arranged on the laying carriage frame. The upper part of the laying carriage only carries the storage device for the supply roll, which is arranged immovably on this above a pivot point defined by the axis of rotation of the laying section upper part. So that during threading the web of material unwound from the supply roll is guided into the area of the feed roller, the upper part of the laying carriage is also provided with a conveyor belt running below the storage roll and parallel to the laying direction, which conveys the web hanging from the storage roll in the direction of the feed roller, so that the material web then hangs down from a front edge of the conveyor belt lying above the feed roller on one side of the feed roller and can be brought into a course wrapping around the feed roller with a deflecting roller which can be moved over the feed roller.

In this fabric laying machine, when laying in pairs for turning, after laying out a layer, the material web is rewound onto the supply roll, i.e. H. unthreaded from the laying mechanism, the upper part of the laying carriage is rotated by 180 ° and then the web is threaded back into the laying mechanism, so that the new layer can be laid out in the same laying direction as the previous one, but now with the opposite web. It follows from this that in order to turn the web as automatically as possible after laying out a layer, threading and threading the web into the laying mechanism and rotating the upper part of the laying carriage by 180 ° must take place as automatically as possible.

With such a construction of the upper part of the laying carriage, however, difficulties arise in the synchronization of the conveying speed of the conveyor belt and the speed at which the material web is unwound, as well as the speed of the input roller, both during threading and during laying.

When unloading and threading the web according to this device, there is a need for the conveying speed of this conveyor belt to be greater than the speed at which the web is unwound from the supply roll, since there is otherwise the risk that the web will be crooked on the conveyor belt comes, so it hangs crookedly in the area of the default roller and is also threaded crookedly. This is undesirable since folds will then appear in the individual layers when the web is later laid out. Furthermore, the conveyor belt must also be continuously driven when laying out, because a leading edge of the conveyor belt lying above the feed roller serves as a deflection edge for the web of material drawn from the supply roll to the feed roller. In this case, the unwinding speed of the supply roll and the speed of the conveyor belt must be exactly synchronized with the speed of the feed roller, which in turn is coupled with the speed of the laying wagon, otherwise there is a risk that the web will be laid out due to insufficient synchronization when the web is laid out of the individual speeds is warped or fed with folds to the preselection roller, so that this can ultimately result in an uneven laying of the web or fold formation.

Based on this prior art, it is an object of the invention to provide an automatically threading fabric laying machine which u. a. is also suitable for pairing, to improve in such a way that an uneven pulling of the web into the delivery mechanism is largely excluded both when threading the web as well as when laying.

Starting from a known fabric-laying machine of the type mentioned at the outset, this object is achieved according to the invention in that the upper part of the laying carriage has a carriage carrying the storage device for the supply roll, that at least one guide element for the web to be unwound is provided on the carriage below the supply roll, approximately parallel to the supply roll axis , which is designed in such a way that the web of material always hangs down from the carriage at approximately the same point on the carriage, irrespective of the unwinding direction of the supply roll, and that the carriage can be moved by hand or by motor parallel to the laying direction from a first to a second position and vice versa, whereby the carriage is positioned in the first position as well as after a rotation through 180 ° in the second position in such a way that a beginning of the web hanging from the supply roll reaches the area of the input roller.

This solution according to the invention has the advantage that, on the one hand, there are no problems due to uneven drawing and threading of the material web, since the material web is pulled smoothly by hanging from the carriage, and, on the other hand, the material laying machine according to DE OS-2 922 930 existing disadvantages can be avoided, since the laying unit is not rotated with the slide and the web is always suspended at the same distance from the default roller by the additional guide element arranged below the slide.

So far, there is no fabric laying machine with a web length control that offers the possibility of automatic threading of the web. Therefore, in a preferred embodiment, the invention provides for at least one so-called dancer roller, with in particular each of the two slide positions being assigned a dancer roller which serves to regulate the drive device and which is in an ineffective position in the other slide position. In such a fabric laying machine, the web can be threaded into the laying mechanism comprising the feed roller and the laying unit in a first carriage position without the dancer roller associated with this carriage position interfering, whereupon the carriage is moved to its second position for laying out the fabric web and thereby the fabric web in a simpler manner Way pulled over the associated dancer roller and at the same time the dancer roller is brought into effect. In addition to the very simple threading of the web into the longitudinal pull control, the invention brings with it the advantage of this exemplary embodiment in particular that the so-called pairing after cutting and rewinding the web from the laying mechanism means that the top of the laying carriage only has to be rotated by 180 ° to bring the carriage back into its threading position without the need to move the carriage.

The dancer rollers could e.g. B. by means of the slide controlled electrical drive means in their effective and ineffective position, in a preferred embodiment of the fabric laying machine according to the invention because of their simplicity, the dancer rollers are mounted on springs suspended against the web, with the wings of one in each of the two slide positions the dancer rollers are held down by the carriage, so that this dancer roller is in its inactive position.

Since the web of material has to wrap around the specification roller over a certain circumferential angle during the laying out, one could proceed in such a way that in the threading position of the carriage, the beginning of the web which depends on the supply roll hangs behind the specification roller (in the direction of travel of the laying carriage) and then the carriage then the rotating supply roll and the stationary feed roller is only pushed forward until the web has laid over the feed roller and has formed a loop behind it. A reliable definition of the wrap angle of the feed roller by the web also when starting and braking the laying carriage results, however, when in the threading position the hanging web start is behind the feed roller, but a web that can be shifted from an inactive rest position over the feed roller into a working position Deflection roller is provided, by means of which the web can be brought into a course that partially wraps around the specification roller.

To unwind the web from the supply roll, this could be arranged on a shaft and driven at a variable speed so that the web delivery speed remains constant despite the decreasing roll diameter. In a preferred embodiment of the fabric laying machine according to the invention, however, a drive roller that can be placed against the circumference of the supply roll is provided for unwinding the material web. In order to ensure in a simple manner that the circumference of the supply roll always lies against the drive roller, the bearing device held by the slide can be designed such that it has a guide for a supply roll axis or shaft which is inclined with respect to the horizontal in the direction of the drive roll. In order to be able to adjust the contact pressure between the supply roll and drive roller and, if necessary, to keep it constant, it may be advisable to make the inclination of the supply roll guide variable and, if necessary, to provide a motorized adjusting device for the inclination of the supply roll guide.

If the direction of rotation of the supply roll caused by the drive device does not correspond to the unwinding direction of rotation of the supply roll during the automatic threading of the beginning of the web into the laying mechanism, this can be eliminated in a preferred embodiment of the fabric-laying machine according to the invention simply by a first scanning device for the supply roll below the supply roll and above Web start for reversing the drive device for unwinding the supply roll is provided. The scanning device is preferably a light barrier. This can now e.g. B. after a certain number of revolutions of the supply roll, but better after a time interval determined by a timer, the timer is started by switching on the drive device to unwind the supply roll.

So-called. Edge controls are known in fabric laying machines; they usually have two light barriers, which are located at a short distance from one another in the region of one of the transverse directions of the web Longitudinal web edges are arranged and control an adjusting device, via which the supply roll can be moved in the axial direction until only one of the two light barriers detects the web. This principle can also be applied to the fabric-laying machine according to the invention, in which the upper part of the laying carriage can then be moved transversely to the laying carriage travel directions with respect to the laying carriage frame and a second scanning device controlling the transverse adjusting motor for one of the longitudinal edges of the web is provided above the presetting roller. In this way, the supply roll can be centered before the beginning of the web reaches the feed roller. Advantageously, the drive device for unwinding the supply roll is switched off during centering, and in order to arm the edge control during automatic threading at the right time, it is advisable to start a second timer by the first scanning device for the start of the web, after which the drive device for Unwinding the supply roll is stopped and the supply roll is centered. It is advantageous if the second timer starts a third timer when it expires, which defines the time period available for centering the supply roll and at the end of which the drive device for unwinding the supply roll switches on again.

It is advisable to switch on the default roller when threading the web into the laying system only when the web deflection roller has already been moved into its working position, which could have been triggered by the expiry of the third timer. Since during the automatic threading of the laying car will normally stand still, but the feed roller during the laying process must be driven in accordance with the speed of the laying car, a preferred embodiment of the fabric laying machine according to the invention provides that the feed roller is uncoupled from the laying car wheels and over by a first clutch a second clutch can be driven by an auxiliary motor. A limit switch for the working position of the web deflection roller can open the first clutch, engage the second clutch and start the auxiliary motor, so that after the retraction of the web deflection roller into its working position, both the supply roll and the default roller rotate and the web start continues in the direction of the laying unit. But it would also be conceivable that during the centering of the supply roll, the web already hangs down so far beyond the input roller that the web deflection roller can be moved into its working position when the supply roll is stationary and then the drive device for unwinding the supply roll and the auxiliary motor for driving the default roller can be turned on at the same time; however, this would have the disadvantage that the web is exposed to a considerable longitudinal pull by the retraction of the web deflection roller, which one will try to avoid especially with light fabrics. In the preferred embodiment of the fabric laying machine according to the invention, therefore, only the auxiliary motor is switched on by a first limit switch assigned to the working position of the deflecting roller, while the supply roll is already rotating into its working position when the deflecting roller is retracted.

In order to save time, especially for pair laying, a slide drive motor that can be switched on by this first limit switch is expediently provided for moving the slide from the threading position into the other slide position, so that the supply roll is already in a position at the beginning of the laying process in which it is can be brought over the input roller and the laying unit again by turning the upper part of the laying carriage by 180 °.

To end the threading process, it is advantageous to arrange a third scanning device for the beginning of the web in the area of the laying unit, by means of which the second clutch is opened and the auxiliary motor is switched off when the beginning of the web has reached or pushed through the laying unit. This third scanning device then also expediently engages the first clutch, so that the set roller then rotates when laying in accordance with the speed of the laying carriage. In addition, the third scanning device can be used to switch off the drive device for unwinding the supply roll at the end of the threading process. Laying units usually have a clamping device for the web. This is also recommended for the fabric laying machine according to the invention, it being particularly advantageous if the clamping device provided in the laying unit can be switched on by the third scanning device.

• Figur 1 den Legewagen mit einem Teil der Auflage in der Seitenansicht, wobei sich die Warenbahn-Vorratsrolle in ihrer Einfädelstellung befindet;
• Figur 2 den oberen Bereich des Legewagens, nachdem der die Vorratsrolle tragende Schlitten in diejenige Stellung verschoben wurde, die er während des Legevorgangs einnimmt;
• Figur 3 die in Figur 2 gezeigten Teile, jedoch nach einer Drehung des Legewagenoberteils aus der in Figur 2 gezeigten Stellung heraus um 180°, so daß sich die Vorratsrolle wieder in ihrer Einfädelstellung befindet;
• Figur 4 den Zustand des oberen Bereichs des Legewagens nach dem Einfädeln in der in Figur 3 gezeigten Position sowie nach dem Verfahren des die Vorratsrolle tragenden Schlittens in die während des Legens eingenommene Position;
• Figur 5 den Bereich um die Vorgabewalze herum mit Warenbahn-Umlenkwalze sowie zwei Lichtschranken der Abtastvorrichtung zum richtigen Positionieren der einen
• Warenbahnlängskante; Figur 6 eine Ansicht der beiden die zweite Abtastvorrichtung bildenden Lichtschranken der Kantensteuerung, gesehen in Richtung des Pfeils A in Figur 5;
• Figur 7 eine Teilansicht in größerem Maßstab nach Fig. 1 bis 4 teilweise im Schnitt;
• Figur 8 einen Schnitt längs Linie 8-8 in Fig. 7 und
• Figur 9 eine Draufsicht auf das Legewagenoberteil ohne Längsschlitten in Richtung des Pfeiles B in Fig. 2

Further advantages and details of the invention result from the following description and the attached drawing of a preferred embodiment of the fabric laying machine according to the invention, with which not only textile fabrics but also foils and other flat material can of course be laid out. The drawing shows:

• Figure 1 shows the laying carriage with a part of the support in side view, the web roll is in its threading position;
• FIG. 2 the upper area of the laying carriage, after the carriage carrying the supply roll has been moved into the position which it occupies during the laying process;
• 3 shows the parts shown in FIG. 2, but after the upper part of the laying carriage has been rotated out of the position shown in FIG. 2 by 180 °, so that the supply roll is again in its threading position;
• FIG. 4 shows the state of the upper region of the laying trolley after threading in the position shown in FIG. 3 and after the carriage carrying the supply roll has been moved into the position assumed during laying;
• Figure 5 shows the area around the default roller with web deflection roller and two light barriers of the scanning device for the correct positioning of the one
• Longitudinal web edge; FIG. 6 shows a view of the two light barriers of the edge control which form the second scanning device, viewed in the direction of arrow A in FIG. 5;
• Figure 7 is a partial view on a larger scale of Figures 1 to 4 partially in section;
• 8 shows a section along line 8-8 in Fig. 7 and
• FIG. 9 shows a plan view of the upper part of the laying carriage without a longitudinal slide in the direction of arrow B in FIG. 2

FIG. 1 shows a view of one of the long sides of a table 10, which is held by a frame (not shown) and forms a support on which layers of fabric are to be laid out one above the other. On the frame, not shown, rails are attached underneath the table 10 on both sides in the longitudinal direction of the table, namely a support rail 12 and a guide rail 14. They serve to support and guide a laying carriage, designated as a whole by 16, which as a lower part is located over the table 10 has extending laying car frame 18, in each of which two castors 20 provided with wheel flanges are rotatably mounted on both sides of the table, by means of which the laying car is supported on the mounting rails 12. For the driving drive of the laying car, a driving motor 22 is provided on the laying car frame 18, on the shaft of which a chain wheel 24 is fastened, which drives the running wheels 20 via a chain 26 and chain wheels 28 which are firmly connected to the pair of running wheels 20.

In the laying carriage frame 18, a specification roller 30 is also rotatably mounted, with the shaft of which two sprockets 32 and 34 are firmly connected. A clutch K1 is also mounted in the laying carriage frame 18, via which two coaxially arranged chain wheels 38a and 38b can be coupled to one another. A chain 40 is used to connect the sprocket 32 to the sprocket 38a, while a chain 42 extends over the sprocket 38b and leads to a sprocket 44 which is coaxial with the sprocket 28 on the left in FIG. 1 and is firmly connected to it.

Via the clutch K1, the specification roller 30 can thus be driven in accordance with the travel speed of the laying carriage 16, the various wheel diameters and the diameter of the specification roller 30 being coordinated with one another in such a way that the peripheral speed of the specification roller 30 corresponds to the traveling speed of the laying carriage 16 when the specification roller over the rollers 20 is driven. The assembly labeled K1 can also contain a gearbox with a continuously variable transmission ratio in order to take account of slippage of the material web on the specification roller. For automatic threading, however, an auxiliary motor M1 is also provided for the preset roller 30, which drives a chain wheel 46 via a clutch K2, over which and the chain wheel 34 runs a chain 50. The motor M1 can be flanged to the coupling K2, which in turn is fastened to a side wall of the laying carriage frame 18.

A laying unit 52 is guided in a height-adjustable manner in a conventional manner on the laying carriage frame, means not shown being provided in order to fix the laying unit with respect to its height. This laying unit, like the specification roller 30, extends across the table 10 and serves to deflect a web 56 unwound from a supply roll 54. For this purpose, the laying unit 52 has a side wall 58a and 58b which also extends across the table 10 Funnel 58 into which the web 56 slides from above, is then deflected by approximately 90 ° through the side wall 58a and finally exits the laying unit 52 on the right from a slot, not shown, as shown in FIG. 1. A clamping strip 60 running in the longitudinal direction of the laying unit 52 can be pressed against the side wall 58a in order to hold the web 56 in place. This terminal strip is attached to swivel arms 62 which can be pivoted counterclockwise from the effective position shown in FIG. 1 by means of a motor M5, so that the terminal strip 60 then releases the web 56. As far as it has been described so far, the laying unit 52 is a known component of conventional fabric laying machines, so that a more detailed description and graphic representation can be dispensed with.

According to the invention, however, a light barrier L2 is attached to the laying unit for detecting the lower edge of an end of the web 56 hanging from the supply roll 54.

There is a carousel on the laying carriage frame 18 68 by means of a rotary bearing 66 rotatable about a vertical axis 67.

The pivot bearing 66 (FIGS. 7 and 8) comprises a plate 66a lying on the laying carriage frame 18, which extends essentially in the horizontal direction, and a stay bolt 66b which is held on the laying carriage frame 18 and arranged coaxially to the vertical axis 67. On this plate 66a runs a ring of rollers 66c, which are guided in a roller cage 66d rotatably mounted on the stud 66b.

The carousel 68 in turn is supported on the rollers 66c by a disk 68a parallel to the plate 66a, which is also rotatably mounted on the stud 66b and thus transmits forces directed parallel to the vertical axis to the rollers 66c.

At its periphery, an edge 68b of the disk 68a is flanged downwards in the direction of the plate 66a, so that it runs parallel to the vertical axis 67 and partially obscures the ring of rollers 66c. Provided on this edge 68b is a guide ring 68c for a drive chain 69a which runs parallel to the plate 66a and extends in the radial direction with respect to the vertical axis.

A drive 69 for rotating the carousel 68 has a drive motor 69b with a shaft 69c parallel to the vertical axis 67, on which a drive pinion 69d for the drive chain 69a is seated.

The drive chain 69a extends around the drive sprocket 69d and from there around the disk 68a, it abuts the edge 68b and is secured against slipping downwards by the guide ring 68c.

The drive chain 69a is fixed to the disk 68a by means of a tab 68d, which is held on the edge 68b in such a way that the carousel 68 is driven by the drive motor 69b and the drive chain 69a by 180 ° in one direction and again by 180 ° in the opposite Direction is rotatable.

This carousel 68 is part of an upper carriage part 70 and carries a transverse guide bed 72, in which a transverse slide 74 is slidably guided perpendicularly to the plane of the drawing in FIG. 1 by means of a dovetail guide. A motor M6, which is attached to the transverse guide bed 72 and which drives a threaded spindle 76 on which a nut (not shown) attached to the transverse carriage 74 runs, serves to shift the cross slide. On the cross slide 74, two longitudinal beams 78 serving as guide rails are fastened one behind the other (viewed perpendicularly to the plane of the drawing in FIG. 1) and at a transverse distance from one another, on which a longitudinal slide 80 carried by them and displaceable in the longitudinal direction of these beams is guided. This forms a frame with two side walls 82 which, viewed perpendicularly to the plane of the drawing in FIG. 1, lie one behind the other and whose distance from one another is somewhat greater than the width of the widest web 56 to be laid out - the transverse distance of the longitudinal beams 78 from one another corresponds to the transverse distance from the Side walls 82. A motor M3 is fastened to one of these side walls and engages with a pinion 84 in a toothed rack attached to the front longitudinal member 78, so that the longitudinal slide 80 can be moved back and forth along the carrier 78 with its help. An axis 88 is fastened further up between the side walls 82 and serves to mount a drive roller 90 which is firmly connected to a chain wheel 92. A chain 96 runs over the latter and a sprocket 94 of a motor M2. Furthermore, two carrier rockers 98, each of which has an actuating arm 100 pointing downward, are rotatably mounted on the axis 88 on both sides of the drive roller 90. The two actuating arms are fixedly connected to one another by a rod (not shown) running parallel to the axis 88, and a traction cable 102 is attached to the front actuating arm according to FIG. 1, the other end of which is fixedly attached to a shaft 104 of a motor M7, so that with the help of the motor M7, the inclination of the carrier arms 98 can be adjusted. An axle 106 rests on the latter, which carries the supply roll 54 and about which the latter can be rotated. As a result of the inclination of the carrier rockers 98, the supply roller 54 always lies with its circumference against the circumference of the drive roller 90, the contact pressure being able to be adjusted by the inclination of the carrier rockers.

Between the side walls 82 of the longitudinal slide 80, sheets forming a funnel 110 are fastened below the supply roll 54, and the funnel side walls 112 and 114 end at the bottom on deflection rollers 116 for the web 56. In the funnel side wall 112 there is a window for the light source of a light barrier L1, which can be assigned a reflector on the other funnel side wall 114. Between the deflecting rollers 116 and the specification roller 30 there is still a deflecting roller 120 fixedly but rotatably attached to the laying carriage frame 18 and a deflecting roller 122 which can be swiveled back and forth between a right rest position and a left working position, the holder of which will be explained in more detail later.

The two positions of the carousel 68 shown in FIGS. 1 and 3 are assigned limit switches E5 and E6, which are actuated by a cam 124 attached to the carousel 68 and serve to switch off the drive motor 69b, by means of which the carousel 68 is rotated. The two end positions of the longitudinal slide 80 shown in FIGS. 1 and 2 are assigned to one of the longitudinal beams 78 attached limit switches E4 and E3, which, for. B. are operated by one of the side walls 82 and serve to switch off the motor M3.

According to the invention, everyone is now the End positions of the longitudinal slide 80 are assigned a so-called dancer roller, by means of which the longitudinal tension of the material web can be regulated when it is laid out. The end position of the longitudinal slide 80, which is defined by the limit switch E3 and shown in FIG. 2, is assigned a first dancer roller 130 which, viewed in plan view (FIG. 9), extends between the longitudinal beams 78 parallel to the axis 88 and with its two ends is rotatably mounted in first dancer wings 132, which are articulated on first dancer arm bearings 134 fastened to the longitudinal members 78 and strive to straighten out from a horizontal position by pivoting counterclockwise under the action of springs, not shown. In the area of one of the two dancer rocker bearings 134 there is an adjusting element (not shown), in particular a rotary potentiometer 135, which is actuated by the one dancer rocker 132 and controls the speed of the motor M2. In FIG. 2, three positions of the dancer rockers 132 are shown in dash-dot lines, namely a middle position labeled "0", in which the motor M2 runs at a normal speed that is approximately synchronized with the speed of the input roller 30, a position located higher up with "1" , in which the longitudinal tension of the web 56 is small and in consequence the speed of the motor M2 is reduced, as well as a lower position located below the middle position, labeled "+", in which the longitudinal tension of the web 56 is too high and in which as a result, the speed of the motor M2 is increased via the rotary potentiometer or the like.

In the position of the longitudinal slide 80 shown in FIG. 1, it holds the first dancer wings 132 in an ineffective, approximately horizontal rest position against the action of their springs by a first pair of rollers 133 acting on them, whereas the longitudinal slide 80 releases the first dancer wings 132 when it is moved into its end position shown in FIG. 2, determined by the limit switch E3. For this purpose, the pair of rollers 133 is arranged on the longitudinal slide 80 in such a way that one of the rollers 133 is at the same distance from the respective carrier 78 as the dancer rocker 132 associated therewith (FIG. 9), so that when the longitudinal slide 80 is moved, for example, from the position according to Fig. 2 in the position shown in FIG. 1, the rollers 133 act on the dancer wings 132 and press downwards in the clockwise direction.

The rollers 133 are arranged on the longitudinal slide 80 so far above the dancer wings 132 that they hold them in the inactive, approximately horizontal rest position in the position of the longitudinal slide 80 according to FIG. 1, and only then release the dancer wings 132 upwards when the rollers 133 have passed the dancer rocker bearings 134 when the longitudinal slide 80 is moved from the position shown in FIG. 1 to the position shown in FIG. 2.

In the same way, the end position shown in FIG. 1 and defined by the limit switch E4 is assigned two second dancer arms 142 with a second dancer roller 140, with dancer arm bearings 144 with a rotary potentiometer 145 being provided on the longitudinal members 78 and the longitudinal carriage 80 for the second dancer arms 142 having a second pair of rollers 143 for holding down the second dancer arms in the same manner as the first pair of rollers 133 when the longitudinal slide 80 releases the first dancer arms 132. The function of the dancer roller 140 is the same as that of the dancer roller 130, the latter of which can only be effective when the limit switch E3 is actuated, while the second dancer roller 140 can only be effective when the limit switch E4 is actuated.

In order to be able to move the longitudinal slide 80 relatively easily on the longitudinal beams 78, it has on each side, i. H. for each of the side members, four castors 150.

FIG. 5 shows that the deflecting roller 122 is supported on both sides in articulated rockers 160, which tend to buckle under the action of tension springs 162 and are fastened to a common shaft 164. A motor M4 is used to drive this shaft. Under the action of the tension springs 162, the deflection roller 122, with its core 122a exposed in the end regions, always bears against stationary guide curves 166 which determine the path of movement of the deflection roller 122. FIG. 5 shows the deflecting roller 122 with the articulated rockers 160 with solid lines in the working position, however, dash-dotted lines in the inactive inoperative position (on the right in FIG. 5).

FIGS. 5 and 6 finally show a scanning device 170 for the one longitudinal edge 56a of the web 56. This scanning device has light barriers L3A and L3B which are arranged one above the other in the direction of travel of the web, but offset transversely with respect to one another, to which a common reflector L3C is assigned and which control the motor M6 for adjusting the cross slide 74 such that the longitudinal edge 56a between the two light barriers L3A and L3B runs. Carriers 180, 182 and 184 shown in FIG. 5 for the various elements for holding the deflection roller 122 and the scanning device 170 are all attached to the laying carriage frame 18. Finally, two limit switches E1 and E2 were mounted on the carrier 180, one of which is actuated by one of the articulated rockers 160 in the working position (E1) and in the rest position (E2).

The mode of operation of the fabric laying machine according to the invention is now to be explained below.

First, the method of automatic threading will be explained, which, for. B. by Pressing a switch D1 (see FIG. 1) on the laying carriage 16 is initiated. When the hand switch D1 is closed, the motor M2 is switched on, so that the supply roll 54 rotates; At the same time, a timer T1 is started, by means of which the direction of rotation of the motor M2 is reversed if, after the time interval Z1 assigned to the timer T1 has elapsed, the light barrier L1 has not yet detected the start of the web 56 - in this case the supply roll 54 initially rotated like this that the web was not unwound.

If the light barrier L1 responds, it starts a second timer T2, the time interval Z2 of which is dimensioned such that the beginning of the web reaches the level of the axis of the predetermined roller 30 and thus hangs to the right of the predetermined roller according to FIG. 1, and also that the one longitudinal edge the web 56 is detected by the scanner 170 (L3A and L3B) for edge control. At the end of the time interval Z2, the timer T2 switches off the motor M2, starts a timer T3 and activates the edge control, the time interval Z3 defined by the timer T3 being dimensioned such that the supply roll 54 can be centered by the edge control, which then The case is when the longitudinal edge 56a lies between the light barriers L3A and L3B by actuating the motor M6, as shown in FIG. 6.

After the time interval Z3 has elapsed, the timer T3 switches on the motors M2 and M4, so that the supply roller 54 rotates again and the deflecting roller 122 is pivoted out of its rest position into its left-hand working position according to FIG. One of the rocker arms 160 actuates the limit switch E1, by means of which the motor M4 is switched off again. Characterized in that the supply roll of goods unwraps during the pivoting of the deflection roller 122 into its working position, a longitudinal tension cannot occur in the web, although the specification roller 30 is stationary. This only begins to turn when the limit switch E1 has been actuated, since this opens the clutch K1, the clutch K2 closes and the motor M1 is switched on. Both the supply roll 54 and the specification roller 30 then rotate.

However, the limit switch E1 also switches on the motor M3, which moves the longitudinal slide 80 out of its one end position shown in FIG. 1 towards the second end position, which is dash-dotted in FIG. 1 and shown in solid lines in FIG. 2. Before the longitudinal slide 80 releases the first dancer wings 132, the beginning of the web reaches the terminal strip 60 and is held by it: In the embodiment shown, the light barrier L2 starts a timer T4, the time interval Z4 defined by this timer being dimensioned such that the The beginning of the web travels the distance from the light barrier L2 to below the terminal strip 60. After the time interval Z4 has elapsed, the timer T4 switches off the motors M1 and M2 and actuates the motor M5 for the clamping bar 60, so that it holds the web of material when the longitudinal slide 80 releases the first dancer wings 132. Of course, the light barrier L2 could also be arranged in the area of the terminal strip 60 or in the direction of travel of the material web, in order to be able to dispense with the fourth timer T4.

Finally, the longitudinal slide 80 actuates the limit switch E3, via which the motor M3 is switched off.

Either at the time the terminal strip 60 closes or, which is less advantageous, by actuating the limit switch E3, the clutch K2 is opened and the clutch K1 is closed.

The fabric planter is now ready to lay and can e.g. B. begin with the laying out of the web that the terminal block 60 is opened and the drive motor 22 and the motor M2 are switched on by a start switch, not shown, the laying carriage 16 according to FIGS. 1 and 2 then moving from right to left .

After describing the function of the fabric laying machine according to the invention, it is understandable that the following motors are advantageously used: a DC brake geared motor with a DC brake for the motor M1, a DC permanent geared motor with tachometer generator and controller for regulating the motor speed for the motor M2 and Three-phase brake geared motors for the motors M3, M4 and M5.

If the web 56 is to be designed in pairs, after reaching the left end position of the laying carriage 16 according to FIGS. 1 and 2, the web is held by the terminal strip 60 and by a conventional cutting device, not shown, integrated in the laying unit 52, in the direction perpendicular to the plane of the drawing Figures 1 and 2 cut off. Then, while the laying carriage 16 moves back from its left to its right end position along the table 10, by actuating the switch D2 "automatic threading out", the web 56 is rewound after opening the terminal strip 60 and is thereby withdrawn from the laying unit and all other parts of the laying system. However, this automatic, complete rewinding of the material web takes place only after the front edge of the material web 56 has passed the light barrier L2; previously it is necessary to keep the switch D2 pressed. Furthermore, the circuit is advantageously configured so that when the motor winds back, the motor M2 is switched off as soon as the front edge of the web 56 has passed the light barrier L1. The upper part of the laying carriage 70 is then rotated through 180 ° into its position shown in FIG. 3, in which the supply roll 54 and longitudinal slide 80 lie over the specification roller 30 and the laying unit 52 located, ie back in their threading position. Then the switch D1 is used to automatically thread the web into the laying system.

If the laying carriage 16 is to be moved back within a fully or partially laid out web position, the switch D3 "rewind" is actuated; the laying carriage 16 then moves from left to right, and the web is rewound onto the supply roll 54 by regulating the longitudinal web train by the dancer roller that is in operation.

Of course, the supply roll 54 could also be driven by a shaft carrying it, or the web 56 could be pulled off the supply roll 54 by hand for the purpose of threading.

Instead of the dancer rollers 130, 140 arranged on the upper section of the laying carriage, one or more dancer rolls could also be provided between the upper section of the laying carriage and the specification roller 30.

The timer T3 could also be saved if the completion of the centering of the one longitudinal web edge is reported by the edge control, for example by querying the light barriers L3A and L3B (one free, one covered), whereupon the motor M2 is switched on and the deflection roller 122 retracted becomes. The motor M6 could also be queried for standstill after switching on the edge control.

Claims (21)

1. A fabrics lay-down machine comprising a laying carriage (16) with wheels (20) and motor-driven for displacement along a support, said carriage including a carriage frame (18) as well as an upper part (70) arranged above said frame, said upper part being rotatable about a vertical axis of rotation (67) and displaceable transversely to the direction of laying relative to said frame by drive means (M6), also comprising a bearing means mounted on the upper part of said carriage for supporting a web supply reel (54) and a drive means (M2, 90) for unwinding said supply reel, a feed roll (30) rotatably mounted on the carriage frame (18) and having an axis parallel to said supply reel (54), said feed roll being drivable in accordance with the speed of travel of said laying carriage (16), and also comprising a laying unit (52) mounted on the carriage frame (18) for deflecting and cutting the web (56), characterized in that the upper part (70) of said carriage has a slide (80) mounting the bearing means for the supply reel (54), that at least one guide member (110 or 116) for the web (56) to be unwound is provided on said slide (80) beneath the supply reel (54), said guide member extending approximately parallel to the axis (106) of said supply reel and being designed such that the web always hangs from said slide (80) at approximately the same location thereof independently of the unwinding direction of the supply reel (54), and that the slide (80) is displaceable, in particular by a motor, parallel to the direction of laying back and forth between a first position and a second position, said slide being positioned in said first position as well as in said second position after rotation through 180° such that the leading end of a web hanging from the supply reel (54) is positioned in the region of the feed roll (30).

2. Fabrics lay-down machine as defined in claim 1, characterized in that at least one compensating roller (130, 140) is provided between supply reel (54) and feed roll (30).

3. Fabrics lay-down machine as defined in claim 2, characterized in that a compensating roller (130, 140) serving to regulate the drive means (M2) is associated with each of the two positions of the slide and is in an inoperative state in the other respective slide position.

4. Fabrics lay-down machine as defined in any of claims 1 to 3, characterized in that in the threading position the leading end of the hanging web hangs down behind the feed roll (30) and that a web deflecting roller (122) adapted to be displaced from an inoperative position over the feed roll into an operative position is provided for bringing the web (56) into a path in which it is partially wrapped around the feed roll.

5. Fabrics lay-down machine as defined in any of claims 1 to 4, characterized in that in the threading position the supply reel (54) is located approximately over the feed roll (30) and that in the other slide positon the web (56) runs from the supply reel (54) over the respectively operative compensating roller (130, 140) and to the feed roll (30).

6. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized in that the bearing means (98) has a guide means for a shaft (106) of said supply reel, said guide means being inclined relative to the horizontal towards a drive roll (90) and that the drive roll (90) is adapted to abut against the periphery of the supply reel (54) and be driven by the drive means (M2, 92, 94, 96).

7. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized by a motor-driven adjusting means (100, 102, 104, M7) for the inclination of said supply reel guide means (98).

8. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized in that a first sensor means (L1) is provided beneath the supply reel (54) and above the feed roll (30) for the leading end of the web for reversing the drive means (M2) for unwinding said supply reel (54).

9. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized in that the upper part (70) of the carriage is displaceable relative to the carriage frame (18) by a cross-adjustment motor (M6) transversely to the direction of travel of the carriage and a second sensor means (170) controlling said cross-adjustment motor (M6) is provided above the feed roll (30) for one of the longitudinal edges of the web.

10. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized in that the feed roll (30) is adapted to be disengaged from the carriage wheels (20) by a first clutch means (K1) and driven by an auxiliary motor (M1) via a second clutch means (K2).

11. Fabrics laydown machine as defined in claims 4 and 10, characterized by a first limit switch (El) associated with the operative position of the def lecting roller (122) for activating said auxiliary motor (M1).

12. Fabrics lay-down machine as defined in claim 11, characterized by a drive motor (M3) for the slide, said motor being adapted to be activated by said first limit switch (E1) for displacing the slide (80) from the threading position into the other slide position.

13. Fabrics lay-down machine as defined in claims 11 or 12, characterized by a third sensor means (L2) for said web leading end, said sensor means being disposed in the region of the laying unit (52) for disengaging said second clutch means (K2) and switching off said auxiliary motor (M1).

14. Fabrics lay-down machine as defined in claim 13, characterized in that the first clutch means (K1) is adapted to be engaged by means of said third sensor means (L2).

15. Fabrics lay-down machine as defined in claims 13 or 14, characterized in that the drive means (M2, 92, 94, 96) for unwinding the supply reel (54) is adapted to be switched off by said third sensor means (L2).

16. Fabrics lay-down machine as defined in any or several of claims 13 to 15, characterized in that a clamping means (M5, 62, 60) for the web (56) is provided in the laying unit (52) and is adapted to be actuated by said third sensor means (L2).

17. Fabrics lay-down machine as defined in claim 8, characterized by a timing member (T1) for activating said first sensor means (L1), said member adapted to be actuated upon activation of said drive means (M2, 92, 94, 96) for unwinding the supply reel (54).

18. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized in that the compensating rollers (130, 140) are mounted on rocker arms (132, 142) spring-biased against the web (56) and that in each of the two slide positions the rocker arms of one of said compensating rollers are depressed by the slide (80).

19. Fabrics lay-down machine as defined in any or several of the preceding claims, characterized in that the slide (80) is, in its two positions, at least approximately symmetrical to the vertical axis of rotation of the upper part (70) of the carriage.

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