Device for actuating clamp having flap of clamp chain

Abstract

The invention relates to a device for actuating a gripper (2) of a film stretching system, which gripper runs at a speed of movement of a gripper chain (3), having a flap (1), from an open position, in which the film is not clamped, to a closed position (5), in which the film is clamped, said flap (1) colliding with a turnover device (6) in the form of a belt loop (8) during its travel through the turnover device. The belt ring (8) is guided by a deflection roller (7). The belt ring (8) is inclined obliquely to the movement path of the clamp chain (3). And the winding speed of the belt ring (8) is synchronous with the movement speed of the clamp (2). The moving speed of the clamp chain (3) ranges from 500 m / min to 750 m / min. When the flap (1) collides with the belt ring (8) in the open position, the flap is gently overturned into the closed position.

Description

Technical Field

[0001] The invention relates to a device for actuating a clamp having flaps of a clamp chain, the device being used in a film stretching plant. Background Art

[0002] In such film stretching plants, a surrounding clamp is usually provided which is combined in a clamp chain and clamps the film to be stretched or treated at its edge. The clamping takes place during the film's passage through the film stretching plant. In order to allow the film to leave the stretching plant, the clamping flaps of the clamps must be brought from the clamping position to the release position. In the unclamped state, the clamps in the corresponding clamp chain are moved back for the film to enter the plant, where the clamp flaps are brought back to the clamping position.

[0003] In order to bring the flap of the clamp to the clamping position, different devices are known. For example, a so-called clamp closing wheel is provided for this purpose, which has a concave area at its periphery, and the concave area interacts with the convex area so as to engage in the flap of the clamp with the concave area, so that the flap of the clamp slides in the concave area and is brought from the open position to the clamping position against the spring force. Such a clamp closing wheel is used for both single-flap clamps and double-flap clamps. Due to the geometric structure of the clamp closing wheel, the length of the sliding path of the corresponding flap at the concave area of ​​the clamp closing wheel is relatively short, so that a relatively high load is generated due to the relatively large friction and pressure of the flap at the closing wheel that absorbs. These loads and these problems also occur in the opening wheel, in which the clamp is brought from the clamping position to the release position. It is not uncommon for a high load to cause damage to the clamp, so that if necessary, a relatively high maintenance cost is generated due to the necessity of replacing these clamps. Such a closing wheel or opening wheel implements a closing movement within a sliding path of 30 to 40 mm of the flap at the closing wheel or opening wheel.

[0004] Furthermore, so-called magnetic closers or openers are known, in which the closing or opening movement of the flap of the tongs is caused by magnetic force. For this purpose, at least a part of the flap of the tongs is ferromagnetic. With such magnetic closers or openers, relatively long paths of, for example, up to 250 to 350 mm can be achieved.

[0005] For lower film travel speeds, significantly below 500 m / min, mechanical closing or opening devices can be used very satisfactorily for a longer period of time. However, the trend towards higher film travel speeds of 700 m / min and above clearly exceeds the possibilities for the reliable use of mechanical systems due to the risk of overload and breakage. Such high film travel speeds are achievable with magnetic closers or openers, but these systems are rather cost-intensive. In addition, magnetic closers or openers cannot be used to retrofit existing facilities without ferromagnetic flaps.

[0006] DE 34 23 901 A1 describes a clamp for a web tensioner, with which medium movement speeds of up to 300 m / min can be achieved, higher movement speeds being not conceivable due to high wear. The clamp described is implemented in a consistently identical movement path with the aid of a pressing device. The pressing device is designed as a continuously circumferential, vertically acting closer. A spring-loaded locking device ensures that the flap of the clamp is reliably held in its open position in the return path from the tensioner outlet to the tensioner inlet. In order to be able to exert a purely vertically oriented downward force on the corresponding tilting lever arm for closing the flap, the known clamp is of very low construction. In particular, movement speeds of more than 300 m / min are excluded from the outset, also due to acceptable noise development. Summary of the invention

[0007] The object of the present invention is therefore to provide a closing or opening device for a flap of a clamp, in which a relatively long movement path from the open position or the open position to the closed position determined by the spring force can be achieved in the range of 150 to 200 mm and which also reliably achieves higher belt travel speeds, for example in the range of 700 m / min or even higher. In addition, with the closing or opening device according to the invention, the kinetic energy introduced into the clamp or the flap for closing purposes should be reduced and thus the closing or opening forces and the noise development should be reduced.

[0008] This object is achieved with a device having the features according to claim 1. Expedient developments are defined in the dependent claims.

[0009] According to the invention, the belt closer or belt opener is configured as a clamp closer or clamp opener, which is constructed from a belt that is wound around at least two deflection rollers, which device is arranged at an angle in space and has a winding speed that is synchronized with the movement speed of the clamp, wherein, by means of the angled arrangement in space, the clamp can be brought from a closed position to an open position or from an open position to a closed position via an adjustable movement path.

[0010] According to the invention, a device for operating a film stretching device with a flap, which moves at the speed of the movement of the clamp chain, has a turning device, by means of which the flap is moved from an open position, in which the film is not clamped, when it moves through the film stretching device, to a closed position in which the film is clamped. In this case, the flap collides with the turning device when it moves through the turning device, wherein the turning device is arranged in the travel path of the clamp in the area of ​​the film entering the film stretching device. Similarly, in the area where the film leaves the film stretching device, it can be provided that the flap of the clamp is moved from a clamped position to a non-clamped open position, in which the film is no longer held by the clamp. In this case, the turning device for turning the flap is designed as a belt loop arranged at an angle in space and guided by a deflection roller. Since the turning device is designed as a belt loop, the device according to the invention is also called a belt closer, because the belt is designed as a belt, preferably a toothed belt. The design as a toothed belt has the advantage that the belt running around the deflection roller engages in a corresponding recess on the deflection roller, so that the belt is guided around the deflection roller essentially without slipping. During the impact of the flaps of the gripper, they run together with the belt loop on their outer side and, after the adjusted movement path, are pressed from the open position in the direction of the closed position until the tipping point is exceeded, after which the tipped flap is in its closed position, i.e. in its position clamping the film.

[0011] According to the invention, the belt loop arranged at an angle in space can be adjusted and arranged as an actual turning device with respect to its angle relative to the flap of the clamp of the clamp chain, so that the entry point of the flap of the clamp at the outer side of the belt or belt of the belt loop and thus the contact length of the flap of the clamp when contacting the outer side of the belt can be adjusted. The adjustment of the contact length of the flap at the belt loop should be designed as large as possible, i.e. preferably in the range of 120 to 250 mm, in particular 150 to 200 mm, in particular 120 to 150 mm, so that even at higher belt travel speeds significantly exceeding 500 m / min, in particular 750 m / min or more, the load caused by the required application of the turning force of the flap from the open position to the clamping position can be reliably maintained. Here, "reliably maintained" is understood to mean that even in longer operations, no damage to components caused by overload, especially at the flap of the clamp, occurs. Preferably, the deflection rollers are adjustable between the deflection rollers in the travel direction of the surrounding belt, so that the tension of the surrounding belt can be adjusted.

[0012] With the design according to the invention, the flap strikes the outer side of the belt flexibly, ie without jerking, and executes a corresponding movement path while in contact with the outer side of the belt, ie until the tipping point of the flap, where it springs into the clamping position caused by a spring.

[0013] Preferably, the flap converges with the belt loop or collides with it at such an acute angle that the flap strikes the belt loop without any jerks at least at its point of impact. This not only reduces the load on the flap or the clamp, but also minimizes the wear on the belt loop. According to the mechanical definition, jerks are understood here to mean that the mathematical second derivative of the motion curve is continuous. Since such a motion curve can only be maintained in theory, it should be understood in this regard that the flap strikes the belt so gently that this occurs largely without any jerks. Therefore, the impact of the flap on the outside of the belt occurs tangentially.

[0014] Furthermore, the movement of the flap together at the belt loop is preferably achieved by a preferably adjustable contact length. The “contact length” is to be understood as the length in which the flap is in contact with the belt loop. When the tipping point is reached, the flap of the clamp will spring into a clamping position due to the spring present, in which the flap no longer contacts the outside of the belt loop.

[0015] Preferably, the contact length can be adjusted via the tilt angle of the flipping device relative to the travel path of the flap. The "tilt angle" should be understood as the angle of the tilting device in space, which the flipping device forms with respect to the travel path of the flap.

[0016] A “tilt angle” is to be understood as meaning the angle of the tilt device at which the longitudinal axis of its drive element is inclined from the vertical.

[0017] Preferably, the contact length is achieved by means of an eccentric wheel by means of a first adjusting cylinder, by means of which the spatial position of the flipping device can be adjusted or adjusted. Compared with the flap closing devices known in the prior art to date, this adjustability of the contact length by the inclination angle of the flipping device represents a particular advantage. In addition to adjusting the contact length by means of the inclination angle of the flipping device, the contact length can also be adjusted by the flipping device by moving the elongated hole arranged in its support. The additional arrangement of the elongated hole offers the advantage that the contact path of the flap on the outside of the belt ring is extended without having to change the inclination angle of the flipping device relative to the travel path of the flap. Therefore, in the presence of an inclination angle that is optimal for the loads occurring, the contact path can still be extended by adjustment via the elongated hole, or, if necessary, also shortened.

[0018] The first adjusting cylinder brings the tilting device into its tilting angle after the entire tilting device has been pivoted into its operating position, ie the position in which the flap collides with the tilting device. The pivoting into and out of the operating position is achieved via the second adjusting cylinder.

[0019] Preferably, the belt or strap of the belt loop is made of a material that is at least somewhat elastic, so that the belt loop has an inherent length reserve. This length reserve is able to compensate for the deviations of the impact points on the outer side of the belt between the individual flaps of the clamp, thereby ensuring a substantially non-jerk impact of the flaps of the clamp on the outer side of the belt despite the deviations.

[0020] Since it is not necessary to magnetically actuate the flap of the clamp by providing a tilting device in the form of a belt loop or belt closure, the flap of the clamp is preferably made of a cost-effective non-ferromagnetic material.

[0021] Preferably, the clamp, ie the clamp chain, travels at a speed of at least 500 m / min. Even at a clamp chain speed of, for example, 750 m / min or more, the dynamics of the flap movement can be reliably controlled with the belt closer according to the invention.

[0022] The belt loop used as a turning device according to the invention is designed so that the flap can be used as a single flap as well as a double flap and the belt implements a movement path in the turning direction of the flap when the flaps travel together on the outside of the belt loop. This means that with the turning device, the flap can be completely pivoted away from its position in which it collides with the outside of the belt loop and is not clamped into its clamped position.

[0023] Particularly advantageous is the configuration of the belt loop as a toothed belt, which has its teeth pointing into the interior of the belt loop, where they engage in corresponding recesses at the deflection rollers, so that the belt loop in the form of a toothed belt is essentially circulated without slipping. In order to maintain the corresponding desired tension around the belt loop, the distance between the deflection rollers in the direction of travel of the belt can be set. However, it is also possible to additionally arrange an additional tensioning element in the form of another deflection roller in the interior of the belt loop. All deflection rollers can be driven separately. However, it is also possible that only a single deflection roller or a part of the deflection rollers is actively driven. The drive can preferably be a servomotor, which is synchronized with the speed of the clamp chain via a control device. By synchronizing the speed of the belt loop with the speed of the clamp and its flaps moved by the clamp chain, the belt of the belt loop does not experience any wear worth mentioning when the flaps collide or travel together at the outside of the belt loop, because the flaps and the belt have the same speed during the travel together.

[0024] Instead of a toothed belt, the belt of the belt loop can also be a flat belt or a chain. In addition to the positive transmission of force from the deflection roller to the toothed belt, a toothed belt is particularly well suited for the use according to the invention, since toothed belts are usually lubricated and slip-free. There is also essentially slip-free operation with chains, but the chains must be lubricated, which is why toothed belts are the preferred belt for the belt loop.

[0025] However, in order to minimize the wear that may occur to a certain extent due to friction, it is preferably provided that a wear-resistant layer is provided on the outer side of the turning device configured as a belt loop, which wear-resistant layer is arranged on the side facing the flap. It is sufficient that the wear-resistant layer is arranged only in the area of ​​the collision path or contact path of the flap with the outer side of the belt loop. Instead of or in addition to the wear-resistant layer, it is preferably provided that the belt loop performs a transverse movement of the belt or the whole on a vertical line, so that the contact area of ​​the corresponding flap at the outer side of the belt of the belt loop changes. Due to the transversal, the contact point of the flap at the outer surface of the belt of the belt loop is constantly changing. This increases the service life of the belt of the belt loop, because the flap does not always hit the outer side of the belt of the belt loop on the same contact line of its movement path. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further advantages, details and embodiments will now be described with reference to the following drawings. In the drawings:

[0027] Figure 1 : shows a top view of a belt loop according to the invention, which is arranged at an inclined angle relative to the travel path of the clamps of the clamp chain;

[0028] Figure 2 :shows the Figure 1 A three-dimensional arrangement of the belt closer according to the present invention;

[0029] Figure 3 : shows the interaction between the belt closer and the flap of the clamp of the clamp chain relative to Figure 2 Zoom in on the rendered drawing;

[0030] Figure 4 : shows a three-dimensional partial view of a belt closure according to the present invention, with a tensioning roller inside the belt loop of the belt closure;

[0031] Figure 5 : A three-dimensional diagram of a toothed belt with a belt loop is shown, in which the engagement position of the flap of the clamp, the movement path of the flap in contact with the belt loop, and the turning point of the clamp are presented;

[0032] Figure 6 : shows a basic three-dimensional diagram of the entire turning device according to the invention in the form of a belt closer;

[0033] Figure 7 : shows a flap of a clamp, wherein the flap contacts the belt return section or the belt return section in the movement path;

[0034] Figure 8a : A top view of a belt closer arranged at an inclined angle relative to the travel track of the clamp chain for presetting the distance between the belt and the flap by means of an elongated hole is shown; and

[0035] Figure 8b : A detailed view of an eccentric wheel is shown for adjusting the inclination angle of the belt closer according to the invention by means of a first adjusting cylinder. DETAILED DESCRIPTION

[0036] exist Figure 1 , a top view of a turning device 6 according to the invention is shown in the direction of the clamp chain 3, where the flap 1 of the corresponding clamp 2 is shown. For a better understanding, the flap 1 of the clamp 2 is shown to be pivotable, wherein, by means of a corresponding interaction of a belt loop 8 according to the invention, the flap 1 is pivoted from the open position of the clamp 2 to the flip position, thereby clamping the film to be stretched perpendicular to the drawing plane in the clamped position. The turning device 6 is in the form of a belt loop 8, which represents a belt closer and is arranged obliquely in space at an angle of inclination and a flip angle. The belt (not individually marked with a figure number) that is looped around the deflection roller 7 is looped around the deflection roller 7 at the respective end of the belt loop 8, thereby forming a closed continuous loop. Due to the movement of the clamp chain 3, which moves at the travel speed of the film through the stretching device, the flap 1 of the clamp 2 comes into tangential contact with the outer side of the belt or belt of the belt closer and moves there from its open position to the flip point, at which the flap 1 of the clamp 2 is pivoted into the clamped position via the respective intermediate position by a spring.

[0037] exist Figure 1 In the upper middle part of the figure, the second adjusting cylinder 10 is shown, which is designed as a hydraulic cylinder and by means of which the entire tilting device 6 can be pivoted from the non-operating position into the operating position and back, for which purpose corresponding levers and stops are provided. After the belt closer has been pivoted into the operating position, its tilting angle is adjusted by actuating the first adjusting cylinder 16 (see also Figure 6 ). The adjusted inclination angle determines the contact length. Before pivoting into the operating position, the tilting angle of the entire tilting device 6 is pre-adjusted to preferably 7°-7.5° by means of a stop screw not shown. With the adjusted inclination angle, when the flap 1 or the clamp 2 moves along the outer side of the belt of the belt loop 8 facing the flap 1, a tilting movement of the flap 1 is achieved up to the tipping point, at which the flap 1 is spring-loaded into a clamping position in which the film is gripped and clamped at the side edge. This clamping cannot be released again during the entire travel of the film through the stretching device.

[0038] In this arrangement, it is desirable to have the longest possible movement path of the flap 1 of the gripper 2 on the outside of the belt of the belt loop 8, thereby reducing the load on the gripper 2 or the flap 1. In order to avoid wear of the belt run or belt run caused by friction, the travel speed of the gripper 2 and the speed of the belt run in the belt loop 8 are synchronized with each other, that is, synchronized so that both have the same speed.

[0039] exist Figure 2 , a turning device 6 according to the invention in the form of a belt closer with two deflection rollers 7 is presented, wherein the angle of inclination of the belt loop 8 relative to the travel direction of the clamp chain 3 with the flap 1 or the clamp 2 is presented in a three-dimensional view by means of a view obliquely from above. Again, the flap 1 that is in contact with the outer side of the belt loop 8 of the belt closer is shown in its contact with the outer side of the belt loop 8 within the movement path caused by the angle of inclination of the belt closer, i.e. from the beginning of the contact of the flap 1 with the outer side of the belt until the turning point at which the flap 1 of the clamp 2 is spring-loaded into the clamping position. At the end of the movement path, the contact of the flap 1 with the outer side of the belt ends. Likewise, this movement path of the flap 1 is presented, which also occurs before the flap 1 comes into contact with the outer side of the belt of the belt loop 8. The figure shows that the flap 1 of the clamp 2 pivots about a pivot axis (not further specified, but presented). Due to the arrangement of the belt loop 8 at an inclined angle relative to the path of the clamping chain 3 during the movement path, the flap 1 of the clamp 2 moves continuously together from the beginning of the contact between the flap 1 and the outer side of the belt of the belt loop 8 until the tipping point at which the flap 1 is spring-loaded into the clamping position.

[0040] Of course, this only occurs when the corresponding flap 1 of the caliper 2 is in contact with the outer side of the belt of the belt loop 8. The deflection roller 7 is designed as a toothed roller in order to transmit the drive energy to the belt in the form of a toothed belt without slip. Figure 2 Also shown in FIG. 1 is the arrangement of the turning device 6 at the entry region of the film into the stretching installation, since from there the film must be clamped by the grippers 2 .

[0041] exist Figure 3 In the three-dimensional representation of the Figure 2 . Clearly recognizable is the clamping chain 3, which is only present in principle with the complete clamp and the associated chain links and the subsequent second clamp 2, which is only shown. Again, the tilting movement of the flap 1 of the clamp 2 is presented by the contact of the flap 1 with the belt loop 8 according to the invention, i.e. the outer side of the belt of the tilting device 6. Also clearly recognizable is the angle of inclination of the belt loop 8 with respect to the movement path of the clamp chain 3 in its direction of travel, whereby the tilting movement of the clamp 1 starts in the movement path of the flap 1 at the outer side of the belt of the belt loop 8 and ends when its tilting point is reached. With the belt loop 8 according to the invention, it is therefore possible to achieve a significantly longer movement path than is possible, for example, with the clamp closing wheel already described in the introduction to the description.

[0042] exist Figure 4In the embodiment, the clamp 2 and its corresponding flap 1 are again presented as a symbolic representation of a clamp chain 3. The flipping device 6 in the form of a belt loop 8 again has a deflection roller 7 at its end, but a tensioning pulley 14 is arranged in its interior in the middle area connecting the two deflection rollers 7, which can increase the tension of the belt or belt of the belt loop 8 or reduce the tension by retreating into the interior, depending on the operating mode. By adjusting the tension of the belt or belt of the belt closer or the belt loop 8, the belt tension can be adjusted accordingly, so that the impact point of the corresponding flap 1 is realized more gently if necessary, without having to change the inclination angle of the belt closer. Here, the tangential impact angle of the flap 1 at the outer side of the belt is approximately close to zero, so that the impact of the flap on the belt is realized more gently. The basic structure corresponds to the embodiment according to Figures 1 to 3 The basic structure.

[0043] Figure 5 A three-dimensional detail of a toothed belt 13 as a belt of a belt loop 8 according to the invention is presented. An area of ​​the belt loop 8 is shown in which the four flaps 1 of the respective clamps 2 of the clamp chain 3, in combination with their engagement with the outer side of the toothed belt 13, form the belt of the belt loop 8 according to the invention. In the left-hand area of ​​the toothed belt 13 of the belt loop 8, the area in which the flaps 1 of the clamps 2 do not yet touch the outer side of the toothed belt is shown by a smaller double arrow. At the end of the area marked by the smaller double arrow, a larger and longer presented double arrow begins, at the left end of which the left middle flap 1 just touches the outer side of the toothed belt. This represents the beginning of the contact and therefore the left end of the contact length 9. At Figure 5 The right middle flap 1 of the clamp 2 shown in the right third of the embodiment is in contact with the outer side of the toothed belt 13 and has just passed the middle length of its movement path with uninterrupted contact with the outer side of the toothed belt 13. At the right end of the larger double arrow representing the contact path of the flap 1 on the outer side of the toothed belt 13, the right flap 1 located there is then pressed in the direction of the clamping position to such an extent that it is flipped from the still open position into the closed, i.e. clamped position due to the spring present in the clamp 2 when the tipping point at the right end of the larger double arrow is reached. In the embodiment shown, the starting path, in which there is no contact of the flap 1 with the outer side of the toothed belt 13, is approximately 50 mm long. In this example, the movement path of the flap 1 with the outer side of the toothed belt 13 until the tipping point is 200 mm as the contact length of the flap 1 with the outer side of the toothed belt 13.

[0044] It can also be seen that the toothed belt 13 of the belt loop 8, i.e. the belt loop as a whole, is tilted in its orientation relative to the direction of travel of the clamping chain 3, so that as the flap 1 of the clamp 2 moves along the movement path, they are increasingly tilted from the beginning of the first contact on the outside of the toothed belt 13 until the flipping point, so that finally at the flipping point, due to the action of the spring installed in the clamp 2, the flap 1 flips into the clamping position and the film is clamped on its side in the film facility.

[0045] exist Figure 6 A three-dimensional view of the entire turning device 6 in the form of a belt loop 8 according to the invention for a belt closer is presented in FIG. The essential elements are: the belt loop 8, by means of which the actual turning process of the flap 1 in its clamped position is carried out; the drive unit 17, which drives the looping belt via the deflection roller 7; the second adjusting cylinder 10, by means of which the entire turning device 6 is pivoted from the non-operating position into the operating position; and the first adjusting cylinder 16, by means of which the tilting angle of the belt closer is adjusted; and the eccentric 11, by means of which the tilting angle between the clamping chain and the belt loop is preset.

[0046] exist Figure 7 , the flap 1 (not shown) of the clamp 2 is shown, wherein the area of ​​the upper end of the flap 1 is marked by a quadrilateral, which marks the contact area 15 of the flap 1 on the belt run. This shows that during the movement path of the flap 1, only the upper area of ​​the flap 1 rests on the belt run or on the outside of the belt of the belt loop 8. The friction between this upper part of the flap 1 and the outside of the belt of the belt loop 8 is ultimately limited to the contact area 15 of the flap 1.

[0047] exist Figure 8a , a top view of a belt closer arranged at an oblique angle to the travel path of the gripper chain is shown, in which there is an elongated hole 12 arranged transversely to the travel direction of the film to be stretched in the system. The belt loop 8, also called gripper closer or belt closer, is preset in the operating position via the elongated hole 12 and in view of the distance between the belt and the flap 1.

[0048] The length of the belt closer is now selected so that the flap 1 contacts the outer side of the belt loop 8 or the belt return only about 50 mm behind the lower deflection roller 7 shown in the figure. The contactless plug is shown by the short double arrow at the bottom. The longer middle double arrow indicates the area in which the flap 1 contacts the outer side of the belt of the belt loop 8 over the entire contact path or the entire contact length 9, i.e. is guided or travels together. After reaching the tipping point at the upper end of the larger double arrow representing the contact path 9, the corresponding clamp 2 is spring-loaded into the clamping of the film to be stretched by the spring action in the clamp 2. By adjusting in the long hole 12, the beginning, i.e. the end, of the contact of the flap 1 on the outer side of the belt of the belt loop 8 can be changed, which also affects the contact length 9.

[0049] And finally, in Figure 8b , a detailed view with the eccentric 11 and the first adjusting cylinder 16 for adjusting the inclination angle between the flap 1 and the belt ring 8 and thus also for adjusting the contact length 9 is presented.

[0050] exist Figure 8b It can be seen that the entire tilting device 6 is pivoted into its operating position by means of the second adjusting cylinder 10, in which it can be adjusted to the desired tilting angle by means of the first adjusting cylinder 16. The tilting angle of the belt loop 8 relative to the travel direction of the clamp chain 3 and thus the start of its contact at the outside of the belt return can be adjusted by means of the eccentric 11. The adjustment scale 18 serves to visualize the adjusted tilting angle of the tilting device 6.

[0051] Reference numerals list

[0052] 1 Flip

[0053] 2 Clamps

[0054] 3 Clamp Chain

[0055] 4 Open position

[0056] 5 Closed position

[0057] 6 Flip the device

[0058] 7. Steering roller

[0059] 8 belt loops / belt closures

[0060] 9 Contact length

[0061] 10 Second adjustment cylinder

[0062] 11 Eccentric wheel

[0063] 12 Long hole

[0064] 13 Toothed belt

[0065] 14 Tensioner

[0066] 15 The contact area of ​​the flap at the belt return section

[0067] 16 First adjustment cylinder

[0068] 17 Drivers

[0069] 18 Adjust the scale

Claims

1. A device for operating a film stretching device having a flap (1) and a clamp (2) moving at the speed of a clamp chain (3) from an open position (4) in which a film is not clamped to a closed position (5) in which the film is clamped, wherein: The flap (1) collides with the flipping device (6) during its travel through the flipping device, which is arranged in the travel path of the clamp (2) in the area of ​​the film entering the film stretching device, wherein the flipping device (6) that flips the flap (1) is constructed as a belt loop (8) arranged at an angle in space, guided by a deflection roller (7), and rotating at a rotating speed, and the rotating speed of the belt loop (8) is synchronized with the movement speed of the clamp (2), characterized in that During the collision of the flap (1) with the belt loop (8), the flap moves together on the outside of the belt loop (8) and, following the adjusted movement path, is pressed from the open position (4) in the direction of the closed position (5) until it exceeds its turning point, and the movement speed of the clamp chain (3) is 500 m / min to 750 m / min.

2. The device according to claim 1, characterized in that The flap (1) collides with the belt loop (8) at such an acute angle that the flap (1) strikes the belt loop (8) without any jerks at least at its impact point.

3. The device according to claim 1 or 2, characterized in that: The joint travel of the flap (1) at the belt loop (8) is achieved by a contact length (9) which can be adjusted via the inclination angle of the turning device (6) relative to the travel path of the flap (1).

4. The device according to claim 3, characterized in that The contact length (9) can be adjusted by means of a first adjusting cylinder (16) via an eccentric wheel (11) in order to adjust the spatial position of the tilting device (6).

5. The device according to claim 3, characterized in that The contact length (9) can be adjusted by means of a displacement of the tilting device (6) via the elongated hole (12).

6. The device according to any one of claims 3 to 5, characterized in that The contact length (9) of the flap (1) at the belt ring (8) is 120 to 250 mm, in particular 150 to 200 mm, in particular 120 to 150 mm.

7. The device according to any one of claims 1 to 6, characterized in that The belt loop (8) has a length reserve which compensates for deviations existing between the individual flaps (1) of the clamp (2) in the impact point of the flap (1) on the belt loop (8).

8. The device according to any one of claims 1 to 7, characterized in that The flap (1) of the clamp (2) is made of non-ferromagnetic material.

9. The device according to any one of claims 1 to 8, characterized in that The flap (1) of the clamp (2) is constructed as a single flap or a double flap.

10. The device according to any one of claims 1 to 9, characterized in that The tilting device (6) can be pivoted completely out of the position in which it collides with the flap (1) by means of a second actuating cylinder (10).

11. The device according to any one of claims 1 to 10, characterized in that The turning device (6) is a toothed belt (13).

12. The device according to any one of claims 1 to 10, characterized in that The turning device (6) is a flat belt or a chain.

13. The device according to any one of claims 1 to 12, characterized in that The turning device (6) designed as the belt loop (8) is driven by a drive unit (17), in particular a servomotor, which is synchronized with the speed of the gripper chain (3) via a control device.

14. The device according to any one of claims 1 to 13, characterized in that The tilting device (6) has a wear-resistant layer, which is arranged on its side facing the flap (1).

Images