Device for operating a clip with a flap of a clip chain

Abstract

The present invention describes an apparatus for operating a clip (2) having a flap (1) and traveling at the movement speed of a clip chain (3) in a film stretching installation from an open position where the clip (2) does not clamp the film to a closed position where the clip (2) clamps the film, in which the flap (1) is caused to collide with a tilting device (6) in the form of a band loop (8) while traveling beside the tilting device (6). The band loop (8) is guided by a deflection roller (7). The band loop (8) is inclined obliquely with respect to the movement path of the clip chain (3). The circulation speed of the band loop (8) is synchronized with the movement speed of the clip (2). The movement speed of the clip chain (3) is 500 m / min to 750 m / min. While the flap (1) is colliding with the band loop (8) in the open position, the flap gently tilts to the closed position.

Description

[Technical Field]

[0001] The present invention relates to a device for manipulating clips having flaps of a clip chain used in a film stretching installation.

[0002] Such film stretching equipment typically includes a plurality of circulating clips organized in a clip chain, which clamp the film to be stretched or processed at its edges. The clamping occurs during the film's passage through the film stretching equipment. To allow the film to exit the stretching equipment, the clamping flaps of the clips must be moved from the clamping position to the release position. In the unclamped state, the clips in each clip chain are moved back toward the film's entrance into the equipment, where the clip flaps are again moved to the clamping position.

[0003] Various devices are known for bringing the flaps of a clip into the clamping position. For example, so-called clip closer wheels are provided for this purpose. The clip closer wheels have a concave area on their periphery that cooperates with the flaps of the clip, which have a convex area for engaging the concave area. Thus, the flaps of the clip slide within the concave area and are brought from the open position to the clamping position against a spring force. Such clip closer wheels are used for both single-flap and double-flap clips. Due to the geometry of the clip closer wheel, the sliding path of each flap in the concave area of ​​the clip closer wheel is relatively short. This results in high loads because the closer wheel must bear the relatively large friction and pressure forces of the flaps. These loads and problems also occur with opener wheels that bring the clip from the clamping position to the release position. High loads often damage the clip, which may require replacement, resulting in relatively high repair costs. Such closer or opener wheels perform a closing movement of 30 to 40 mm within the sliding path of the flap relative to the closer or opener wheel.

[0004] Furthermore, so-called magnetic closers or magnetic openers are known, in which the closing or opening movement of the clip flap is caused by magnetic force. This requires that at least a portion of the clip flap be made ferromagnetic. Such magnetic closers or magnetic openers allow relatively long paths, for example, up to 250-350 mm.

[0005] For low film speeds significantly below 500 m / min, mechanical closure or opener devices can be used satisfactorily for longer periods. However, the tendency toward high film speeds of 700 m / min and above significantly reduces the possibility of reliable use of mechanical systems due to the risk of overload and breakage. While such high film speeds are certainly possible with magnetic closures or magnetic openers, such systems are quite expensive. Furthermore, magnetic closures or magnetic openers cannot be used for retrofitting existing equipment that does not have a ferromagnetic flap on the clip.

[0006] German Patent Application Publication No. 3,423,901 describes a clip for a web tensioning machine, which allows moderate movement speeds of up to 300 m / min, with higher movement speeds not being considered due to high wear. The described clip always achieves an equal movement path by a restraining device. The restraining device is configured as an infinitely circulating, vertically acting closer. A spring-loaded restraining device ensures that the clip's flap is securely held in the open position during the return path from the tensioning machine outlet to the tensioning machine inlet. To close the flap, the known clip is configured very low so that a purely vertically directed restraining force can be applied to the corresponding tilting lever arm. Furthermore, movement speeds above 300 m / min are initially excluded due to acceptable noise generation, among other reasons.

[0007] The object of the present invention is therefore to provide a closer or opener device for a clip flap, which allows a relatively long movement path in the range of 150-200 mm from the open or released position to the closed position due to spring force, and which also reliably allows high band running speeds, for example up to 700 m / min or more.Furthermore, it is desired that the closer or opener device according to the present invention reduces the kinetic energy supplied to the clip or flap for closing purposes, and thus the closing or opening force, as well as noise generation.

[0008] This problem is solved by a device having the features of claim 1. Advantageous refinements are defined in the dependent claims.

[0009] According to the present invention, a belt closer or belt opener is provided as a clip closer or clip opener, which is formed from a band that circulates around at least two deflection rollers, and the device is arranged at an oblique angle in space and has a circulation speed that is synchronized with the movement speed of the clip, and in this case, by being arranged at an oblique angle in space, the clip 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 present invention, a device for operating a clip having a flap and traveling at the speed of a clip chain in a film stretching installation includes a tilting device by which the flap is moved from an open position, in which the film is not clamped, to a closed position, in which the film is clamped, as the clip passes through the film stretching installation. The flap impinges on the tilting device while traveling beside it, and the tilting device is arranged in the clip's travel path in the area of ​​the film entering the film stretching installation. It may also be specified that the tilting device moves the clip flap from the clamping position to the open, non-clamping position, in which the film is no longer held by the clip, in the area of ​​the film's exit from the film stretching installation. In this case, the tilting device for tilting the flap is configured as a band loop guided by deflection rollers arranged at an oblique angle in space. Due to this configuration of the tilting device as a band loop, the device according to the present invention can also be called a belt closer, since the band is configured as a belt, preferably a toothed belt. The toothed belt configuration has the advantage that the band running around the deflection roller engages in corresponding recesses in the deflection roller, so that the band is guided around the deflection roller virtually without slippage. During the impact of the flap of each clip, this flap runs together with the band loop against the outer surface of the band loop and is pressed along a coordinated path of movement from the open position towards the closed position until it passes a tipping point, after which the tipping flap is in its closed position, i.e. in the position for clamping the film.

[0011] According to the present invention, the band loop, which is actually a tilting device arranged at an oblique angle in space, can be adjusted with respect to the angle relative to the clip flap of the clip chain, thereby adjusting the insertion point of the clip flap on the band or belt outer surface of the band loop and thus the length of contact of the clip flap when traveling in contact with the band outer surface. The length of contact of the flap with the band loop can be adjusted as much as possible, preferably within the range of 120 to 250 mm, particularly 150 to 200 mm, and especially 120 to 150 mm, so that the required load due to the flap tilting force from the open position to the clamping position can be reliably maintained even at higher band running speeds significantly above 500 m / min, especially 750 m / min or higher. In this case, "reliably maintained" means that there is no damage to components, particularly the clip flap, due to overload, even during longer runs. Preferably, the deflecting rollers are displaceable between the deflecting rollers in the running direction of the circulating band, thereby making it possible to adjust the tension of the circulating band.

[0012] In one configuration according to the present invention, the flap strikes the outer surface of the band smoothly, i.e. without jerk, and forms a corresponding movement path in contact with the outer surface of the band, up to the tilt point at which the flap bounces back to the clamping position due to the spring.

[0013] Preferably, the flap meets or impacts the band loop at an acute angle such that the flap impacts the band loop at least at the impact point without jerk. This not only reduces the load on the flap or clip, but also minimizes wear on the band loop. By jerk-free, we mean here, according to the mechanical definition, that the mathematical second derivative of the motion curve is continuous. Since such a motion curve can only be maintained theoretically, it should be understood in this context that the flap impacts the band gently and this occurs substantially without jerk. That is, the impact of the flap on the outer surface of the band occurs in the tangential direction.

[0014] More preferably, the flap runs against the band loop over a preferably adjustable contact length, by which is meant the length of time the flap is in contact with the band loop. When the tipping point is reached, due to the spring present, the clip flap springs back to a clamping position where the flap no longer has contact with the outer surface of the band loop.

[0015] Preferably, the contact length can be adjusted in relation to the inclination angle of the tilting device relative to the travel path of the flap, where "inclination angle" means the angle of inclination of the tilting device in space relative to the travel path of the flap.

[0016] "Tilt angle" means the angle of inclination of the tilting device at which the longitudinal axis of the drive element of the tilting device is tilted from the vertical.

[0017] Preferably, the contact length is realized via an eccentric body, the spatial position of which can be displaced or adjusted by a first adjusting cylinder. This adjustability of the contact length in relation to the tilting angle of the tilting device represents a particular advantage over flap closing devices known in the prior art. In addition to adjusting the contact length in relation to the tilting angle of the tilting device, the contact length can be adjusted by displacing the tilting device via a slot in the retaining means of the tilting device. The additional placement of the slot offers the advantage of extending the contact distance of the flap on the outer surface of the band loop without having to change the tilting angle of the tilting device relative to the flap's travel path. Thus, even when an optimal tilt angle exists for the loads that occur, the contact distance can still be extended or, if necessary, shortened by displacing via the slot.

[0018] After the entire tilting device has been pivoted to its operating position, i.e., the position where the flap strikes the tilting device, the first adjusting cylinder brings the tilting device to its tilt angle. Pivoting into and out of the operating position is carried out via the second adjusting cylinder.

[0019] Preferably, the band or belt of the band loop is made of a material having at least some elasticity, so that the band loop has an inherent length allowance that can compensate for deviations that exist between the individual flaps of the clip in the impact points on the outer surface of the band loop, thereby ensuring a substantially jerk-free impact of the flaps of the clip on the outer surface of the band, despite the deviations.

[0020] Since magnetic actuation of the clip flaps is obviated by the provision of a tilting device in the form of a band loop or belt closer, clip flaps are preferably provided which are made of an inexpensive non-ferromagnetic material.

[0021] Preferably, the clips, i.e. the clip chain, run at a speed of at least 500 m / min. Even at clip chain speeds of, for example, 750 m / min or more, the belt closer according to the invention ensures that the dynamics of the flap movement are controlled.

[0022] The band loop according to the invention used as a tilting device is configured such that the flap, which can be used as a single flap or a double flap, is allowed a tilting movement path by the band when the flap runs together against the outer surface of the band loop, i.e., the tilting device allows the flap to pivot completely away from a non-clamping position in which it abuts against the outer surface of the band loop to a clamping position.

[0023] It is particularly advantageous if the band loop is configured as a toothed belt with its teeth facing the inside of the band loop and engaging in corresponding recesses at the deflecting rollers, so that the band loop in the form of a toothed belt circulates substantially without slippage. To maintain the desired tension of the circulating band loop, the spacing between the deflecting rollers can be varied between them in the running direction of the band. However, it is also possible to additionally arrange additional tensioning elements in the form of further deflecting rollers on the inside of the band loop. All deflecting rollers can be driven separately. However, it is also possible to actively drive only one or some of the deflecting rollers. The drive device in question is preferably a servomotor synchronized to the speed of the clip chain via a control device. Synchronizing the speed of the band loop to the speed of the clip with the flap, which is moved by the clip chain, prevents significant wear on the band of the band loop when the flap hits or runs against the outer surface of the band loop. This is because the flap and band have the same speed while traveling together.

[0024] Instead of a toothed belt, the band of the band loop can also be a flat belt or a chain. However, in addition to the positive-locking transmission of forces from the deflecting roller to the toothed belt, the toothed belt is also particularly well suited for use according to the invention, since it is generally lubrication-free and slip-free. Although a chain also provides substantially slip-free operation, the chain must be lubricated, so a toothed belt forms the preferred band of the band loop.

[0025] Nevertheless, in order to minimize wear that may occur to some extent due to frictional forces, it is preferred that the outer surface of the tilting device formed as a band loop is provided with a wear-resistant layer arranged on the surface facing the flaps. In this case, it is sufficient that the wear-resistant layer is arranged only within the collision or contact distance of the flaps with the outer surface of the band loop. Instead of or in addition to the wear-resistant layer, it is preferred that the band loop performs a reciprocating movement of the band or generally in the vertical direction, thereby changing the contact area of ​​each flap on the outer surface of the band of the band loop. Due to the reciprocating movement, the contact point of the flap on the outer surface of the band of the band loop constantly changes. This extends the service life of the band of the band loop, since the flap does not always collide with the same contact line of the flap's movement path on the outer surface of the band of the band loop.

[0026] Further advantages, details and embodiments are explained on the basis of the following drawings. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a plan view of a band loop according to the present invention, arranged at an angle relative to the travel path of the clips of the clip chain; [Figure 2] 2 is a diagram showing a three-dimensional arrangement of the belt closer according to the present invention shown in FIG. 1. FIG. [Figure 3] 3 shows an enlarged view compared to FIG. 2 of the interaction between the belt closer and the flap of the clip of the clip chain. [Figure 4] 1 is a partial three-dimensional view of a belt closer according to the present invention with a tension roller disposed inside the band loop of the belt closer. [Figure 5] 10 is a three-dimensional view of the toothed belt of the band loop showing the engagement position of the flap of the clip, the movement path of the flap contact with the band loop, and the tilt point of the clip. FIG. [Figure 6] 1 is a three-dimensional view of the entire tilting device according to the invention in the form of a belt closer in principle; [Figure 7] 10A-10C illustrate flaps of a clip showing the area of ​​the flap contacting the belt or band section in the path of motion. [Figure 8a] This is a plan view of a belt closer that is arranged at a predetermined inclination angle with respect to the running path of the clip chain in order to pre-adjust the distance from the flap to the band using an elongated hole. [Figure 8b] FIG. 10 is a detailed view including an eccentric body for adjusting the angle of the belt closer according to the present invention by a first adjusting cylinder.

[0028] 1 shows a plan view of a tilting device 6 according to the invention directed towards a clip chain 3, with the flap 1 of each clip 2 drawn in. For clarity, the flap 1 of the clip 2 is shown as being pivotable, and by corresponding interaction with a band loop 8 according to the invention, the flap 1 is pivoted from the open position of the clip 2 to a tilted position, so that the film to be stretched, which is positioned perpendicular to the plane of the drawing, is clamped in the clamping position. The tilting device 6 is in the form of a band loop 8, which forms a belt closer and is arranged obliquely in space with an inclination angle and a tilt angle. A band (not separately labeled) circulating around a deflection roller 7 circulates around each end of the band loop 8 around the deflection roller 7, thereby forming a closed, endless loop. The movement of the clip chain 3, which is moved at the running speed of the film through the stretching equipment, causes the flaps 1 of the clips 2 to contact the outer surface of the band or belt of the belt closer in a tangential direction, where they are moved from their open position to a tilt point, at which point the springs cause the flaps 1 of the clips 2 to pivot beyond their respective intermediate positions into a clamped position.

[0029] The middle upper part of FIG. 1 shows a second adjusting cylinder 10, which is a hydraulic cylinder and can pivot the entire tilting device 6 from the non-operating position to the operating position and vice versa. For this purpose, corresponding levers and stops are provided. After pivoting the belt closer to the operating position, the tilt angle of the belt closer is adjusted by operating the first adjusting cylinder 16 (see also FIG. 6). The adjusted tilt angle determines the contact length. Before pivoting to the operating position, the tilt angle of the entire tilting device 6 is pre-adjusted by a set screw (not shown) to preferably 7° to 7.5°. When the flap 1 or clip 2 is moved along the outer surface of the band of the band loop 8 facing the flap 1, the adjusted tilt angle tilts the flap 1 to a tilt point where, due to a spring, the flap 1 rebounds to a clamping position where it grips and clamps the film with its lateral edge. This clamp is not released again during the entire run of the film through the stretching equipment.

[0030] In such an assembly, it is desirable for the flap 1 of the clip 2 to have as long a path of movement as possible in contact with the outer surface of the band of the band loop 8, thereby reducing the load on the clip 2 or flap 1. To avoid wear of the band or belt sections due to friction, the running speed of the clip 2 and the circulation speed of the band sections within the band loop 8 are synchronized with each other so that they both have the same speed.

[0031] FIG. 2 shows a tilting device 6 according to the invention in the form of a belt closer with two deflection rollers 7, in which the inclination angle of the band loop 8 relative to the running direction of the clip chain 3 with the flap 1 or clip 2 is shown in a three-dimensional view from obliquely above. Furthermore, the flap 1, which contacts the outer surface of the band loop 8 of the belt closer due to the inclination angle of the belt closer, is shown within the range of its movement path from the start of the flap 1's contact with the outer surface of the band to the tilt point at which the flap 1 of the clip 2 springs back into the clamping position due to the spring. At the end of the movement path, the flap 1's contact with the outer surface of the band is terminated. The movement path of the flap 1, which occurs before the flap 1 contacts the outer surface of the band of the band loop 8, is also shown. This illustration makes it clear that the flap 1 of the clip 2 is pivoted about a pivot axis (not shown in detail but shown). By positioning the band loop 8 at a predetermined inclination angle relative to the running path of the clip chain 3, the flap 1 of the clip 2 runs continuously during its movement path from the start of contact of the flap 1 with the outer surface of the band of the band loop 8 to the inclination point where the flap 1 bounces back into the clamping position due to the spring.

[0032] Of course, this only occurs if the flap 1 of each clip 2 is brought into contact with the outer surface of the band of the band loop 8. The deflection roller 7 is designed as a roller with teeth, so that the drive energy is transmitted without slip to the band in the form of a toothed belt. Figure 2 also shows that the tilting device 6 is arranged in the entry area of ​​the film into the stretching installation, since from the entry area onwards the film has to be clamped by the clips 2.

[0033] FIG. 3 shows the situation shown in FIG. 2 in a modified, three-dimensional view, i.e., a side view. The clip chain 3, which is only illustrated in principle with the complete clip, the corresponding chain link, and the subsequent second clip 2, is clearly visible. Also shown is the band loop 8 according to the invention, i.e., the tilting movement of the flap 1 of the clip 2 due to the flap's contact with the outer surface of the band of the tilting device 6. The inclination of the band loop 8 relative to the movement path of the clip chain 3 in the running direction is also clearly visible, whereby the tilting movement of the clip 1 begins in the movement path of the flap 1 on the outer surface of the band of the band loop 8 and ends when the clip 1 reaches the tilting point. The band loop 8 according to the invention therefore allows for a significantly longer movement path than, for example, is possible with the clip closer wheel already described at the beginning of the description.

[0034] FIG. 4 further illustrates a clip 2 and the corresponding flap 1 as a symbol of a clip chain 3 according to another embodiment. The tilting device 6 in the form of a band loop 8 also has deflection rollers 7 at its ends, but inside the tilting device 6, a tensioning wheel 14 is arranged in the intermediate region connecting both deflection rollers 7. This tensioning wheel 14 can increase or decrease the tension of the band or belt of the band loop 8 depending on the operating mode. By adjusting the tension of the belt or band of the belt closer or band loop 8, the belt tension can be adjusted accordingly, which may result in a gentler impact point of each flap 1, without the need to change the inclination angle of the belt closer. In this case, the tangential impact angle of the flap 1 with the outer surface of the band approaches zero, which results in a gentler impact of the flap on the band. The basic structure corresponds to the structure shown in FIGS. 1 to 3.

[0035] FIG. 5 shows a three-dimensional partial view of a toothed belt 13 as a band of a band loop 8 according to the present invention. The region of the band loop 8, including the four flaps 1 of each clip 2 of the clip chain 3, which are engaged with the outer surface of the toothed belt 13 forming the band of the band loop 8 according to the present invention, is shown. In the left region of the toothed belt 13 of the band loop 8, a relatively small double-headed arrow indicates the region where the flaps 1 of the clips 2 have not yet contacted the outer surface of the toothed belt. At the end of the region indicated by the small double-headed arrow, a longer, relatively large double-headed arrow begins, and at the left end of this arrow, the left-side intermediate flap 1 just contacts the outer surface of the toothed belt. This indicates the beginning of contact and thus the left end of the contact length 9. The right-side intermediate flap 1 of the clip 2 shown in the right third of FIG. 5 is in contact with the outer surface of the toothed belt 13 and has traveled exactly halfway through the flap 1's path of motion without interrupting contact with the outer surface of the toothed belt 13. At the right end of the larger double arrow, which shows the contact distance of the flap 1 with the outer surface of the toothed belt 13, the right flap 1 is still pressed in the direction of the clamping position by the spring present in the clip 2 until it is tilted from the open position to the closed, i.e., clamping, position when it reaches the tipping point located at the right end of the larger double arrow. In the illustrated embodiment, the preparatory path, during which the flap 1 is not yet in contact with the outer surface of the toothed belt 13, is approximately 50 mm long. The path of movement of the flap 1 with corresponding contact with the outer surface of the toothed belt 13 up to the tipping point is 200 mm in this example, as is the length of contact of the flap 1 with the outer surface of the toothed belt 13.

[0036] It can also be seen that the toothed belt 13 of the band loop 8, i.e. the entire band loop, is tilted in its orientation relative to the running direction of the clip chain 3, so that during the course of the movement of the flap 1 of the clip 2 along its movement path, this flap 1 is increasingly tilted starting from its initial contact with the outer surface of the toothed belt 13 up to a tilting point, whereby finally, under the action of a spring built into the clip 2, the flap 1 tilts into a clamping position and clamps the film on its side in the film installation.

[0037] 6 shows a three-dimensional view of the entire tilting device 6 in the form of a band loop 8 of a belt closer according to the invention. The main elements are the band loop 8, which realizes the actual tilting of the flap 1 into the clamping position, a drive unit 17 which drives the band circulating via the deflection roller 7, a second adjusting cylinder 10 which swivels the entire tilting device 6 from the non-operating position to the operating position, a first adjusting cylinder 16 which adjusts the tilt angle of the belt closer, and an eccentric 11 which pre-adjusts the tilt angle between the clip chain and the band loop.

[0038] 7 shows the flap 1 of the clip 2 (not shown), in which the area of ​​the upper edge of the flap 1 is shown as a rectangle indicating the contact area 15 of the flap 1 with the belt section. On this basis, it becomes clear that during the movement path of the flap 1, only the upper area of ​​the flap 1 is in contact with the outer surface of the belt section or the band of the band loop 8. The friction situation between this upper part of the flap 1 and the outer surface of the band of the band loop 8 is ultimately limited to the contact area 15 of the flap 1.

[0039] 8a shows a plan view of a belt closer with a slot 12 arranged transversely to the running direction of the film to be stretched in the installation, which is arranged at an angle to the running path of the clip chain 3. The band loop 8, also called the clip closer or belt closer, is pre-adjusted in its operating position via the slot 12 with respect to the spacing of the band from the flap 1.

[0040] The length ratio of the belt closer is selected so that the flap 1 first contacts the outer surface of the band or belt section of the band loop 8 approximately 50 mm after the lower deflection roller 7 shown in the drawing. This contact-free section is indicated by the short, lower, double-headed arrow. The longer, middle, double-headed arrow indicates the area in which the flap 1 contacts, i.e., is entrained or travels along, the outer surface of the band of the band loop 8 over the entire contact distance or contact length 9. After reaching the tipping point located at the upper end of the large double-headed arrow depicting the contact distance 9, the corresponding clip 2 springs back into clamping with the film to be stretched due to its internal spring action. Adjustments within the slots 12 thus allow the beginning of contact of the flap 1 with the outer surface of the band of the band loop 8 to be varied, thereby ultimately influencing the contact length 9.

[0041] Finally, FIG. 8b shows a detailed view including the eccentric 11 and the first adjusting cylinder 16 for adjusting the inclination angle between the flap 1 and the band loop 8 and thus the contact length 9 .

[0042] 8b, it can be seen that the entire tilting device 6, which can be adjusted to the desired inclination angle by the first adjusting cylinder 16, has been swiveled into the operating position by the second adjusting cylinder 10. The eccentric 11 makes it possible to adjust the inclination angle of the band loop 8 relative to the running direction of the clip chain 3 and thus the start of contact of the clip chain 3 with the outer surface of the band section. An adjustment scale 18 is used to visualize the adjusted inclination angle of the tilting device 6. [Explanation of symbols]

[0043] 1 flap 2 clips 3 Clip Chain 4 open position 5 Closed position 6 Tilt device 7. Directional roller 8 Band Loops / Belt Closers 9 Contact Length 10 Second adjusting cylinder 11 Eccentric body 12 slots 13 Toothed belt 14 Tension Wheel 15 Contact area of ​​flap to belt section 16 First adjusting cylinder 17 Drive unit 18 Adjustment Scale

Claims

1. A device for operating a clip (2) having a flap (1) and traveling at the speed of a clip chain (3) in a film stretching machine, from an open position (4) where it does not clamp the film to be stretched and processed, to a closed position (5) where it clamps the film, wherein the flap (1) collides with the tilting device (6) while traveling alongside the tilting device (6) located in the area of ​​the film entering the film stretching machine, causing the flap (1) to tilt. The tilting device (6) is formed as a band loop (8) that circulates at a circulating speed, guided by a deflection roller (7) arranged at an oblique angle in space, and the circulating speed of the band loop (8) is synchronized with the speed of the clip (2), The apparatus is characterized in that, during the collision of the flap (1) with the band loop (8), the flap (1) travels together in contact with the outer surface of the band loop (8), the band loop (8) presses the flap (1) from the open position (4) to the closed position (5) according to a controlled motion path until it exceeds the point of inclination of the flap (1), the film is clamped at its edges in the closed position of the clip, and the motion speed of the clip chain (3) is 500 m / min to 750 m / min.

2. The apparatus according to claim 1, characterized in that the flap (1) collides with the band loop (8) at an acute angle such that the flap (1) collides with the band loop (8) without any jerking at least at the point of impact.

3. The apparatus according to claim 1, characterized in that the flap (1) travels in contact with the band loop (8) over a contact length (9) that is adjustable in relation to the inclination angle of the tilting device (6) of the flap (1) with respect to the travel path.

4. The apparatus according to claim 3, characterized in that the contact length (9) is adjustable by a first adjustment cylinder (16) via an eccentric body (11) for adjusting the spatial position of the tilting device (6).

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

6. The apparatus according to any one of claims 3 to 5, characterized in that the contact length (9) of the flap (1) in the band loop (8) is 120 to 250 mm, particularly 150 to 200 mm, and particularly 120 to 150 mm.

7. The apparatus according to claim 1 or 2, characterized in that the band loop (8) has a length allowance that compensates for the deviations present between the individual flaps (1) of the clip (2) at the point of collision of the flap (1) with respect to the band loop (8).

8. The apparatus according to claim 1 or 2, characterized in that the flap (1) of the clip (2) is made of a non-ferromagnetic material.

9. The apparatus according to claim 1 or 2, characterized in that the flap (1) of the clip (2) is formed as a single flap or a double flap.

10. The device according to claim 1 or 2, characterized in that the tilting device (6) can be rotated by a second adjustment cylinder (10) so as to move completely away from the position where it would collide with the flap (1).

11. The apparatus according to claim 1 or 2, characterized in that the tilting device (6) is a toothed belt (13).

12. The apparatus according to claim 1 or 2, characterized in that the tilting device (6) is a flat belt or a chain.

13. The tilting device (6), formed as a band loop (8), is driven by a drive unit (17), particularly a servo motor, which is synchronized with the speed of the clip chain (3) via a control device, according to claim 1 or 2.

14. The apparatus according to claim 1 or 2, characterized in that the tilting device (6) has a wear-resistant layer disposed on the surface facing the flap (1).

Images