EP0481323A1 - Method for feeding a production machine with a precision centering and apparatus therefor - Google Patents

Abstract

To feed a production machine with strip material from a coil (2, 15), an unwinding station (1) is provided in which the coil (2, 15) is unwound with its axis (5) vertical, i.e. while lying in a horizontal plane. As a result, the strip (4) drawn off from it lies in a vertical plane and, for the production machine, must be twisted through 90 DEG in a twisting section (20). In order to avoid internal stresses in the strip (4), the strip (4) is centred with respect to the centre axis (M) of the production machine before twisting is carried out, centring being performed in a centring device (6). <IMAGE>

Description

The invention relates to a method according to the preamble of claim 1 and to devices according to the preamble of claims 2 and 11 respectively.

Such a method has become known from EP-A-0 267 357. The coil is placed with a vertical axis on a rotatable base or a turntable, then the strip start is pulled off, then the strip is rotated by 90 so that it comes to lie in an approximately horizontal plane, and finally centered on an axis predetermined by the processing machine .

The processes according to FR-A-2 340 149 proceeded similarly, but by hand, in which a hand-operated rotating device with a subsequent, driven pair of rollers formed the pulling and rotating device, but deliberately from a non-centered one for reasons of the chosen arrangement The position of the coil was assumed because a certain angle to the plane of the coil was considered appropriate.

Although this method and its associated device have generally proven themselves well in practice, internal stresses sometimes occur in the workpieces produced in the processing machine, which can have an unpleasant effect on delicate products. Naturally, the origin of such internal tensions is difficult to determine, since they can already be introduced during the production of the strip-like material, generally sheet metal strips, or also during the winding of the coil, etc. Therefore, the processing machine is generally preceded by a so-called straightening machine which is deformed of the belt between interlocking rollers compensates for such tensions. Another, sometimes occurring phenomenon was the one-sided wear of belt guides arranged after the centering section.

These shortcomings were not hidden from the experts in the past either, as the introduction to DE-B-1 296 475 in particular shows. However, the solution according to this document also only resulted in rough centering, because only the position of a single edge of the tape was taken into account. In general, however, coils with different strip widths are processed, so that the central axis of the strip - if the position of only one edge of the strip is determined - will deviate depending on the strip width from a desired position and corresponding to the machine axis. For this reason, the long-known disadvantages could not be eliminated by this construction.

In a first step, the invention is based on the knowledge that at least some of the phenomena described above may be due to the centering, and this results in the task of creating an improved centering method, making the system cheaper and enabling a shorter overall length. This is achieved in a surprisingly simple manner by the features of the characterizing part of claim 1.

While in the known method the coil-side end of the band-shaped material is determined by the position of the coil and possibly by clamping surfaces engaging on the band and therefore hindering good centering, this effect is prevented by the measure according to the invention. Advantageous embodiments of the invention are described in the characterizing parts of claims 2 to 10.

A safe actuation of a band clamping device on a coil in an unwinding station can be achieved by a device according to claims 11 and 12, respectively.

• Fig.1 Eine erfindungsgemässe Anlage für das Beschicken mit einer Richtmaschine;
• Fig.2 eine Stanzmaschine mit erfindungsgemässer Beschickungsvorrichtung ohne Richtmaschine;
• Fig.3 eine vergrösserte Ansicht eines Details aus Fig.1 zur Veranschaulichung einer Hebe-Plattform, die in
• Fig.4 in Draufsicht in zwei verschiedenen Ebenen entlang der Linie IV-IV der Fig.3 gezeigt ist;
• Fig.5 eine erfindungsgemässe Zentriereinrichtung; und
• Fig.6 einen Geräteträger für die Aufnahme der erfindungsgemässen Bandzentriereinheit, sowie gegebenenfalls Abzugswalzen und eventuell auch einer Schere, alles in Modulbauweise, im Horizontalschnitt, wozu die Fig.6A,6B eine vergrösserte Aussicht einer Betätigungseinrichtung für eine Bandklemme in zwei Stellungen entsprechend der Linie A,B - A,B veranschaulicht;
• Fig.7 und 8 je eine Variante der Hebeeinrichtung für die Coils, in Schrägsicht; und
• Fig.9 eine bevorzugte Ausführung der Abwickelstation in axonometrischer Darstellung.

Further details of the invention result from the following description of exemplary embodiments described with reference to the drawing. Show it:

• Fig.1 An inventive system for loading with a straightening machine;
• 2 shows a punching machine with a loading device according to the invention without a straightening machine;
• 3 shows an enlarged view of a detail from FIG. 1 to illustrate a lifting platform which is shown in FIG
• Figure 4 is shown in plan view in two different planes along the line IV-IV of Figure 3;
• 5 shows a centering device according to the invention; and
• 6 shows an equipment carrier for receiving the tape centering unit according to the invention, and optionally take-off rollers and possibly also scissors, all in modular construction, in horizontal section, for which purpose FIGS. 6A, 6B show an enlarged view of an actuating device for a tape clamp in two positions along line A. , B - A, B illustrates;
• 7 and 8 each a variant of the lifting device for the coils, in an oblique view; and
• 9 shows a preferred embodiment of the unwinding station in an axonometric view.

1, a straightening machine 22 is supplied with strip-like material 4. This band-shaped material 4 is at the right end of Fig.1 unwound from a coil 2 at a roll-off station 1. The strip-shaped material 4, which, as can be seen, lies in a vertical plane from the coil 2, since the coil is unwound with a vertical axis of rotation 5, passes through a strip transport and twisting device 20, which in itself is similar to that of FIG. 9 EP-A-0 267 357 could be formed. Before this, the band-shaped material 4 is aligned on centering rollers 6, at the center of feed rollers 21, which - in the direction of movement of the belt 4 - are connected downstream of a pair of take-off rollers 9, which may pull off directly from the coil 2. The take-off rollers 9 (due to the vertical belt level at this point) have vertically directed axes, whereas the axes of the feed rollers 21 are horizontal after being rotated by the belt transport and twisting device 20 connected to the take-off mechanism 20.

The feed rollers 21 and possibly a vertical (not shown) pair of centering rollers - here for centering the belt 4 in the horizontal plane - are expediently accommodated in a side stand 54 designed in a modular design. These centering rollers are designed analogously to those according to FIG. 5, but of course arranged rotated by 90.

The strip-shaped material 4 can then, if necessary, pass through a straightening machine 22 which has the strip to and fro rolls 50, 51, and a loop section (not shown) before entering a processing machine 18, for example a welding machine, here a high-frequency stamping press (which is characterized by the arrangement of compensating masses for the fast punching movement and is accommodated in a soundproof housing 19), which loop section can be replaced by the combined loop and twist section 24 if the straightening machine 22 is omitted. Each of these loop sections is expediently provided with a light barrier 28 for regulating the loop size. Furthermore, each loop section is assigned a corresponding loop guide 25, which generally consists of a series of rollers.

The coil 2 is arranged on a lifting platform with a supporting platform 3. Instead of the lifting platform 3, another form of a vertically displaceable slide can also be provided. A single coil 2, preferably in a cassette known per se, not shown, e.g. according to WO 90/09945, which is hereby considered to be disclosed, which is taken from a coil store; However, it is also possible to provide a conventional pallet reel with a plurality of coils arranged one above the other, which, for example, belong to the execution of a single order and are therefore processed one after the other. For correct centering on the height of the take-off rollers 9, an edge sensor 26 is provided, particularly in this case, expediently for the upper edge of the coil 2. Of course, this does not take into account the width of the band-shaped material on the coil 2, so that it is practically only a rough centering, as is sufficient for pallet reels and has been proposed, for example, with a photoelectric converter in DE-B-1,296,475.

After all, this coarse centering already enables you to get by with minimal handling when changing from one coil to another, yes, that this change can even take place automatically. It is only necessary for this that the lift is designed for such a large load and its drive is controlled by the sensor 26. The lifting platform 3 carries a turntable 7, via which the respective coil 2 can be driven in the unwinding direction, and optionally also in the winding direction. Lifting device and unwinding drive form an unwinding station 1, which can be designed in its upper section as a magazine for additional coils 15.

The unwinding station has at least two, preferably three to four stands 12 which have latching holes 12a, e.g. in two adjacent vertical rows, as can be found in furniture making. Holding devices 12b can be hung in these latching openings, which support the horizontal cassettes 87 (FIG. 3; see also EP-A-0267357) or documents 72 (FIG. 1.3) of the coils 15 (FIG. 1). As shown in FIG. 1, when applied to the storage of coils, this has the advantage that in the case of coils which are wider than the hole division of the holes 12a, the division of the holding elements 12b need not be changed because - as with the higher coils 15 (with wider band material) can be seen in FIG. 1 - the coil is narrower in diameter than its base (this has already been described in EP-A-0 267 357) and can therefore penetrate between the holding elements 12b. In a magazine file, this middle coil 15 then occupies two positions one above the other. This arrangement is of course also advantageous regardless of the centering device described above.

The aforementioned use of stands 12 with a division of notches 12a (which may also be designed differently) may also be used to modify and expand an unwinding station. If it is desired to replace a conventional unwinding station, as shown in EP-A-0 267 357 mentioned above, with one with a lifting device, this could also be hung directly into the stand 12 without requiring a separate frame.

It goes without saying that the lifting device can be designed differently, for example may also have fluid cylinder units. It is essential, however, that it can be raised in more than just two positions. For example, it would be conceivable to attach three or more hydraulic cylinders to the bottom of the unwinding station 1, which act in the peripheral region or in the region of the edge of the platform 3. This in turn has the advantage that it counteracts tilting during the vertical movement and thus also ensures that the platform 3 (which can also be formed simply by a rust-like frame) is in a perfect, horizontal position during unwinding. This prevents the searched, centered position from being disturbed by tilting the platform.

However, in order to allow a greater compactness of the construction and an easy assembly on the hole stands 12, it is advantageous if the lifting device works with elongated tension members, such as cables or (preferably) chains 73, and thus with the aid of an anchoring beam 74 on the holes 12a, or, according to FIG. 3, can be better fixed to the blocks 13 firmly connected to the stands 12 or their connecting walls (not shown).

Furthermore, it is advantageous if at least one drive motor 8 or 76 is arranged on the platform 3 itself. Of these, the motor 8 is provided for driving the turntable 7, while a drive shaft of the lifting device can be driven by the motor 76 via a gear 77 (FIG. 3), so that no further installations are required for the installation of such a lifting device. The gear 77 is expediently designed to be self-locking, for example in the form of a worm gear. An output cable of the edge sensor 26 is connected to the motor 76 and its lifting control, not shown, which is designed similarly to a lift control and, as is known per se in lift controls, can be designed as a mechanical sensor with a roller at the end of a lever in order to actuate a switch .

Because of the already mentioned importance of a tilt-free alignment, it is also advantageous if guide rollers 80 engaging on the platform 3 in the peripheral region of the rotary plate 7 are arranged (only two of them are shown in FIG. 4). For easier replacement, it is also advantageous if sliding guides, here in the form of rails 81, are connected to the lifting device, since then the platform 3 carrying the essential elements only needs to be inserted.

With regard to the sliding guides 81, it is clear that these are designed to be as low-friction as possible, given the high weight resting on them. Roller guides, such as those used in drawer guides, are conceivable, but it is easier and more stable if they are provided with a sliding coating, in particular made of plastic.

As far as the chains 73 are concerned, it is expedient to arrange them in the manner of a pulley block, for which purpose two chain wheels 83 are fastened to a drive shaft 82 (FIG. 3, 7), which cooperate with deflection wheels 84 on an axis parallel to the shaft 82 . 3 further deflection wheels 85, 86 are arranged above it.

In order to be able to process, instead of mere coils, those in cassettes (which are indicated by dash-dotted lines in FIG. 3 at 87), which are provided with passage openings for driving the coil, it is advantageous to use a drive adapter that is practically only a carrier for the roller packs 88 shown in FIGS. 3 and 4, of which in FIG. 3 the right one is shown in section, the left one in side view. Each of these rollers adapts to the respective speed of the turntable 7 and transfers it smoothly to the overlying coil support 72 with the coil 2 or 15 lying thereon, without the inclined cone surfaces which require a special design of the turntable for bevel gears .

A gearbox 89 is also assigned to the rotary drive motor 8, above which a rotary plate 90 with driver pins 71 for the rotary plate 7 is arranged. Since, as mentioned, the band-shaped material 4 is pulled off from the coil with the aid of the take-off rollers 9, the rotary drive 8 is not absolutely necessary for the coil; rather, the tape 4 can also be pulled off the rollers 9, similar to the capstan drive of a tape recorder. However, it is preferred to proceed as described in the simultaneously filed application “Process for controlling the loading of a processing machine with strip material and device therefor” by the same applicant, which is hereby considered to be disclosed.

According to the invention, the strip 4 which has now been pulled off the coil 2 in a vertical plane is centered before being rotated into the horizontal position, as shown in FIG. 5. A frame 92 is provided therein, on which two guide columns 93 are expediently fastened in a vertical position. As can still be seen, the device shown in FIG. 5 is practically a measuring device which adjusts the height adjustment of the platform 3, so that the band-shaped material 4 is on and in a central plane M. Location is unwound.

As such, it would be conceivable to mount a number of sensors in a row running perpendicular to the central plane M, for example inductive, capacitive or, as preferred, photoelectric converters. In the former case, an increased signal (or none at all) would result at the output of those sensors in the area of which the band actually lies, so that the actual width of the band 4 can be calculated from the number of responsive sensors leaves. The same effect could be achieved with a single sensor moved perpendicular to the central plane M.

However, the preferred embodiment according to FIG. 5 looks different. Here opposing centering surfaces, preferably in the form of centering rollers 6, can be moved towards one another with the aid of the drive 16 until they meet an edge of the belt 4 and give a corresponding signal to the lifting motor 76, which thus moves the platform 3 into that of the centered one Position raises the appropriate height until the other centering surface also abuts the opposite edge of the belt.

The drive for the centering rollers 6 can be of any design, for example also fluid. However, it is preferred to use a worm 97 driven by a motor 16, which has a left-hand thread on the one hand and a right-hand thread on the other hand approximately up to the central plane M. In this way, it is ensured without complicated synchronization devices that both rollers 6 can move towards one another by the same amount and at the same speed.

With the two threaded sections of the worm 97, two movable supports 98 work together, which have a corresponding internal thread 97 'engaging in the worm 97 at their right end (refer to FIG. 5) and are guided in their movement by the guide columns 93. Each of these carriers 98 carries an axis 95, on which the centering roller 6 is rotatably mounted and thus does not hinder a longitudinal movement of the belt 4 as soon as it rests on the roller. The worm 97 plays the role of a synchronizing device for the movement of the two carriers 98, and it can be understood from this that it can be replaced by any other synchronizing device, for example if each carrier 98 is assigned its own cylinder drive or motor.

A sensor traveling on the carrier 98 is connected to each of these centering rollers 6, which sensor is designed here - together with a reflector - as a light barrier 28a. If, therefore, the respective carrier 98 approaches the edge of a belt 4 to be centered, the light barrier is interrupted at the moment when the roller 6 reaches the associated belt edge. Certainly, the reaching of the belt edge could also be determined by measuring a current on the motor 16 which may increase thereupon, but this could lead to undesirable voltages in the belt 4, which is why the arrangement shown is more advantageous.

Even if only one of the light barriers is interrupted, the motor 16 and the worm 97 continue to move. The centering roller 6, which has first arrived at a belt edge, thus pushes the belt against the central plane M in front of it. However, these outputs are connected to an EXCLUSIVE-OR gate 99 which only emits a signal when only one of the sensors is providing a signal, i.e. the one who has not yet reached the associated band edge. The output signal of the EXCLUSIVE-OR gate triggers a control stage 91 for the motor 76 of the lifting device, so that the motor 76 begins to rotate when one of the centering rollers 6 reaches the edge. Its rotational speed or that of the downstream transmission is set such that the lifting device expediently also moves in synchronism with the displacement of the belt 4 against the central plane M.

It goes without saying that reaching an edge by means of a centering roller 6 means that the associated coil 2 lies in a corresponding plane and must therefore be shifted accordingly by actuating the lifting device. Only when the second centering roller 6 has reached its associated edge does its light barrier signal also fail to appear. Accordingly, a logic element 94 with AND function reports (in the case of an inductive or capacitive sensor an AND gate, in the case of a photoelectric or pneumatic sensor, as here, a NAND gate) to the control circuit 91 of the motor 76 and to a control circuit 96 for the motor 16 that the centering process has ended and causes both motors to be switched off. This also achieves fine centering, which theoretically can also be achieved without the coarse centering by means of the mechanical sensor 26, in particular if the lifting device cannot be displaced over several coil widths, i.e. should only be suitable for holding a single coil. Conversely, in some cases the rough centering described using sensor 26 may be sufficient. In any case, it is important that the belt 4 is freely movable in the area of the centering rollers 6, because otherwise it could only be brought into the central position temporarily.

In any case, before entering the processing machine 18, there is a loop strut ke to provide, which is preferably designed as a combined loop and twist section 24 - as shown in Figure 2 - with the loop guides 25. These have an inlet roller basket 48 and an outlet roller basket 48 '. The loop section also has the loop sensor 28 already described with reference to FIG. 2 for the size of the loop. Because the loop section 24, in which the band 4 lies loosely, is connected downstream of the centering device, the free height mobility of this band section is ensured for centering without loss of space or special precautions.

Deviating from the conventional, however, lifting drives are also provided for at least one of the loop guides 25 or at least one of the roller baskets 48, 48 ′, here expediently in the form of fluidic cylinder units, such as pneumatic cylinders 35, around at least one of the roller baskets 48, 48 ′, in particular both bring the centering position to be aligned to the center plane M, which is given by the dimensions of the processing machine 18.

It is clear from what has been said that it is advantageous to control the two cylinders 35 together with the other parts of the centering device. For this purpose, the circuit according to FIG. 5 has a flip-flop 100 with its inputs at the outputs of the two logic elements 90, 94 or an analog flip-flop whose output Q is connected to a control stage 38 for the two cylinders 35 is.

If the EXCLUSIVE-OR gate 90 gives the switch-on signal, the output Q is switched, i.e. the control stage 38 having a switching valve receives a signal which causes this switching valve to open, whereupon air is supplied to the underside of the cylinders 35. This function presupposes that the sensor 26 is set in such a way that the platform 3 normally remains somewhat below its target position corresponding to the central plane M. Otherwise, the circuit shown must practically be doubled in the sense that corresponding control elements are also available for lowering the lifting device or the roller baskets. It goes without saying that the motor 76 must have reversible rotary devices.

However, as soon as the NAND gate 94 gives the "end" signal, the flip-flop 100 is switched to its output Q, i.e. the output Q switches off and the cylinders 35 remain in their respective positions.

Numerous modifications are conceivable within the scope of the invention; for example, the use of the stand 12 with its catch system, as explained, is also advantageous without a centering device. It goes without saying that the sensor 26 can optionally be replaced by other sensors, such as a television camera to which an edge detection circuit is connected, as has become known for a wide variety of purposes, in particular in the form of contrast detection circuits. In the latter case, the fine centering could also be carried out with the aid of the lifting device if the center plane M is calculated from the determination of the edges (which can also be done in a different way than with a television camera).

Regardless of where the fine centering takes place, it should be noted that the special design of the lifting device 3, 73-77, in particular with its support on the circumference of the lifting platform 3, ensures a much more even handling and also saves space than known lifting devices with a central reciprocating piston, because there was always the risk of tilting or a slight skew. In the case of several spindles, a complex synchronization device would be required, which can be dispensed with in the preferred embodiment according to the invention with positively synchronized chains.

It follows from the above explanations that a whole series of devices 6, 9, 14 are provided at the exit of the unwinding station 1, where they should be accessible, but possibly also tape cassette devices. Therefore, in order to improve accessibility and to enable a modular construction of individual units which can be detachably connected to one another, it is preferred if the pair of take-off rollers 9 (FIG. 1, 2) and / or a belt centering unit 6, 16, 28a (FIG. 5) is releasably attached to stands 12 from the operating position shown in FIG. In the present case, this is done in that the carrier 23 can be pivoted out on a hinge 17, so that on the one hand this gives access to the band and the devices assigned to it and on the other hand also to the units mounted on the carrier 23, which advantageously also includes the scissors 14 , is relieved. In addition, a conventional unwinding station can be converted cheaply into one according to the invention, since all devices can be preassembled on the carrier 23, which also reduces the delivery times.

Above all, this also gives access to an advantageously provided band clamping device c on a frame spanning the coil (not shown in FIG. 6) including the rotatable carrier (cf. application WO 90/09945) f with a stationary clamping jaw c1 and a movable clamping jaw c2 guaranteed. Likewise, a clamping actuation device a associated with this band-clamping device fastened on the frame side is accessible, which is shown in more detail in two positions in FIGS. 6A, 6B.

The strap clamping device according to these figures differs from that described in WO 90/09945 primarily by an extension p of one of the levers of the toggle lever system used. This extension p serves as an actuation approach. However, since the frame f is now pushed into a drawer dr in its plane, but is actuated on the unwinding side by a clamp actuating device a mounted there, care must be taken to ensure that these two devices are correctly coupled to one another.

This can be done in various ways per se, for example by capturing the actuation approach p of funnel-shaped converging surfaces at the top and bottom and bringing it into the desired position by moving these surfaces. A much more space-saving design is, however, that the clamping actuating device a has two claws C11, C12 which are at a distance from one another to form a coupling opening o, the spacing of which from one another is dimensioned in accordance with FIG. 6A such that it not only corresponds to the width of the actuating projection p , but also a tolerance of at least 20%, preferably at least 25%. If the claws C11, C12 and / or the attachment p then have a corresponding width in the direction of insertion (cf. the double arrow 52 in FIG. 6), so that there is a secure overlap in the operating position of the frame f (in FIG. 6 this is the case) secured by the appropriate width of the approach p), so that proper functioning is guaranteed under all circumstances.

As can be seen particularly from FIG. 6B, the claw part can be pivoted about a fixed axis x and is identified by the piston rod r of a piston-cylinder unit pc that can be pivoted about an axis x1 with fluid connections hc shown in FIG. 6B from the one shown in FIG. 6A Clamped position (= the insertion position of the frame f) brought into the open position shown in FIG. 6B, in which the band 4 is exposed between the jaws c1, c2. It can be seen from FIG. 6A that the claws C11, C12 assume a closed position, shown in broken lines, when reclamping, which is slightly offset from the rest position shown in full lines for the engagement of the two parts p and C11, C12 and o, respectively to bring the actuating extension p securely into its clamping position according to FIG. 6A, on the other hand to assume it in the rest position, in which the extension p can be inserted approximately centrally into the opening o.

7 shows that the chain 73 has four different parts 73/1 to 73/4, the parts 73/1 and 73/3 on the one hand and the parts 73/2 and 73/4 on the other in each case in an analogous manner are led. Each chain part 73/1 to 73/4 is attached at one end to a stationary point P above the lifting platform 3 on the stand 12 (FIG. 1). The other end of the chain parts 73/1 to 73/4 is attached to the floor, below the lifting platform 3 at a point P '. In between, the chain parts 73/1 and 73/3 (starting from the upper point P) pass through the sprocket 83 and a deflection wheel 84 'which is fastened coaxially with the sprocket 84 on its shaft. The chain parts 73/2 and 73/4, on the other hand, first run over the sprocket 84, starting from the upper point P, in order then to be guided over a deflection wheel 83 'arranged coaxially with the sprocket 83. It goes without saying that the good engagement of the chain links in the sprocket teeth must be ensured, because each chain part, taken on its own, does not ensure a stable position of the lifting platform 3. The drive with the help of the motor 76 via the drive shaft 82 takes place via the chain wheels 83, from where the movement is also transmitted to the chain wheels 84.

For this reason, another form of chain guide, as shown in FIG. 8, can also be used. There, too, four chain parts 123/1 to 123/4 are used, of which the chain parts with an even end digit and those with an odd end digit are guided in an analogous manner. One end of each of the chain parts 123/1 to 123/4 is attached to the floor point P ', the other directly to the lifting platform 3. In between, the chain parts 123/1 and 123/3, starting from the attachment point on the lifting platform 3, first run upwards and then down over the deflection wheel 85. Coaxially with the sprocket 83, a first deflection wheel 83 'is attached to the lifting platform 3, via which the chain parts 123/1 and 123/3 run in an almost horizontal direction to a further deflection wheel 84' arranged coaxially with the sprocket 84, and from there down to point P '.

Similarly, the chain parts 123/2 and 123/4, starting from their attachment point on the lifting platform 3, initially run upwards to a stationary deflection wheel 86, from where they are again guided downwards to the chain wheel 84. After wrapping it around 90, the respective chain part 123/2 or 123/4 then runs approximately horizontally to the driving sprocket 83, and from there down to point P '.

This latter variant has the advantages of a block and tackle and is therefore preferred.

The problem of accessibility has been discussed above with reference to FIGS. 6-6B and the equipment rack 23. The problem is exacerbated by the fact that for reasons of avoiding an accident risk (especially at high unwinding speeds of the heavy coils 2), the unwinding station is desired as far as possible Protect against unauthorized access.

So far, the problem has been solved in such a way that protective grids have been set up around known pallet reels, which provided insufficient protection with easy detachability, but made access to the unwinding station more difficult with difficult detachability.

According to FIG. 9, a satisfactory solution can now be found by placing the entire unwinding station 101 in a closed housing ho formed by walls w, which can be closed, for example, by a protective grille-like cover 61. The arrangement is preferably such that the take-off rollers 9 and / or the centering rollers 6, possibly together with the scissors 14, are attached on one side of the housing ho, expediently in the carrier 23 mentioned, whereas on the opposite side one by at least one Cover, like the two doors d shown here, is provided with a closable loading opening 30, whereby the handling is improved (compared to the loading shown in the previous figures at right angles to the take-off rollers 9). In addition, this design enables such unwinding stations 101 to be arranged next to one another in a row, at most interrupted by laterally mounted magazines, so that all unwinding stations 101 can be loaded from a common loading aisle, preferably via controlled handling devices, which simplifies the control of these devices. 9 shows the application of the unwinding station 101 for known pallet reels with several coils 2 one above the other, but due to the modular construction with easily releasably attachable units, it goes without saying that a conversion to cassette operation with the frame f mentioned is easily possible.

Claims (12)

1. A method for loading a processing machine (18) with a band-shaped material (4) from a coil (2,15), in which the coil (2,15) is unwound at least approximately horizontally while rotating with an at least approximately vertical unwind axis (5) , whereby the belt plane is at least approximately vertical, but is then rotated in a twisting step by approximately 90 ° around the belt longitudinal axis, and in which the belt-shaped material (4) with its belt longitudinal axis is turned into a predetermined one in a fine centering step in front of the processing machine (18) , is aligned to a central plane (M), characterized in that the fine centering step taking into account the position of both edges of the band-shaped material is carried out before the twisting step, in particular by adjusting the height of the coil (2,15). 2. Device for loading a processing machine (18) with band-shaped material (4) from a coil (2,15), in which the coil (2,15) with at least approximately vertical axis of rotation (5) is unwound at least approximately horizontally while rotating , with a rotatable coil carrier (7) and a coil transport and twisting device (20) connected downstream of the coil carrier, by means of which the strip-shaped material (4) can be pulled off the coil (2, 15) and then rotated by 90 about its longitudinal axis that the tape transport and - twisting device (20) - directly on the coil carrier (7) - a device carrier (23) with a band centering unit (6, 16, 28a) and / or one that is designed as a modular unit that can be detachably fastened in its operating position Puller roller pair (9) is connected upstream. 3. Device according to claim 2, characterized in that a) that at least one of the following features is provided: in addition, a pair of scissors (14), optionally also designed as a separate, modular unit, is arranged on the device carrier (23) or can be detachably fastened; b) that the belt transport and twisting device (20) is followed by a side stand (54) that contains at least one pair of feed rollers (21) and is also designed as a modular unit, which optionally has vertically arranged centering rollers for centering the belt on the neutral axis (M). 4. Apparatus for carrying out the method according to claim 1, having an unwinding station (1) having a rotatable base (7) with a vertical axis of rotation (5), a twisting path on which a belt transport and twisting device (20) for the band-shaped material ( 4) is provided, as well as a belt centering unit (6, 16, 28a) for this material (4), characterized in that the centering device (6, 16, 28a) is arranged at a location where the belt-shaped material is located before the twisting section (4) including its free end is adjustable in height. 5. Device according to one of claims 2 to 4, characterized in that the belt centering unit (6, 16, 28a) has at least two centering rollers (6) which can be adjusted to the opposite edges of the belt-shaped material (4), and that at least one of the following features is preferably provided: a) that, in order to automate the centering process, at least one edge of the band-shaped material (4), in particular at least the upper edge, is assigned at least one edge position sensor (26, 28a), for example a mechanical sensor (26) and / or at least one photoelectric converter (28a) is, wherein in the presence of two edge position sensors, each of them is preferably connected to the centering roller (6) assigned to it and is adjustable with it towards the edge; b) that the two centering rollers (6) are connected to a synchronized drive (16) for the purpose of synchronizing their movement, and that for this purpose a drive motor (16) with a screw (97) provided with threads with different pitch directions is expediently provided. 6. Device according to one of claims 2 to 5, characterized in that the unwinding station (1) has a lifting device (3,73-77) with a height-displaceable and fixable in more than two different heights for the turntable (7) the unwinding station (1), which carriage (3) is connected to at least three points in the region of its circumference with a hoist (73-77) which expediently has an elongated traction means (73), in particular a chain (73), which may be driven and / or arranged and designed in the manner of a pulley block via a self-locking drive, such as a screw drive. 7. The device according to claim 6, characterized in that at least one of the following features is provided: a) the carriage (3) is designed in the form of a platform and carries at least one drive motor (8 or 76) for the rotary drive of the plate (7) and / or for the lifting drive; b) a slide guide (88), in particular with a plurality of rollers (80), is attached to a slide guide (88) which comes to rest in the peripheral region of the turntable (7); c) a sliding guide (81), in particular low-friction, for example coated with sliding plastic, for connecting the slide or the platform (3) to the lifting device (73-77) is connected. 8. Device according to one of claims 2 to 7, characterized in that the unwinding station (1) at least two stands (12) with spaced catches (12a), in particular with locking holes for inserting holding elements (12b) for receiving the Coils (2,15) carrying cassettes (87) or documents (72) are assigned, while the lifting device (3,73-77) can preferably be anchored to blocks (13) connected to the stands (12) or their connecting walls. 9. Device according to one of claims 2 to 8, characterized in that the belt centering unit (6, 16, 28a) has a loop section (24) with an inlet and outlet guide (25), in particular the free height mobility of the belt-shaped material ( 4) securing infeed roller basket (48), which is arranged immediately downstream that preferably this roller basket (48) can be adjusted in height and that a height adjustment control (38) with a corresponding control (91, 94, 96, 99) of the lifting device (3, 73-77) of the unwinding station (1) for the purpose of achieving a height adjustment of the inlet guide (48) which is analogous to the height adjustment of the rotatable base (7). 10. Device according to one of claims 2 to 9, characterized in that an unwinding station (101) having the rotatable coil carrier (7) and the take-off rollers (9) is designed as a closed housing, and that preferably a loading opening which can be covered by at least one housing closing element the side of the housing opposite the wall carrying the take-off rollers (9) is arranged. 11. Device for loading a processing machine (18) with band-shaped material (4) from a coil (2,15), in which the coil (2,15) with at least approximately vertical axis of rotation (5) is unwound at least approximately horizontally while rotating , with a rotatable coil carrier (7) surrounded by a frame, on which frame a band clamping device is provided and these parts can optionally be accommodated in an unwinding station driving the coil carrier (7), in particular according to one of the preceding claims, characterized in that that a clamping actuating device is provided at the unwinding station with a coupling opening receiving an actuating part of the frame-side band clamping device when accommodating the frame in the unwinding station. 12. The device according to claim 11, characterized in that the clamping actuating device has two actuating claws lying opposite one another and forming the coupling opening between them, and that at least one of the following features is preferably provided: a) the coupling opening delimited by the actuating claws for the entry of the actuating part corresponds to the size of the same plus a tolerance dimension of at least 25%; b) the actuating claws lie in a plane perpendicular to the direction of introduction of the, preferably insertable, frame into the unwinding station.

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