Packaging machine comprising a waste strip winder with a differential gear

Abstract

The invention relates to a packaging machine in which a first material web or a trough is occupied by / filled with an item to be packaged, comprising a sealing station which seals another material web to the material web or the trough and comprising a cutting device which separates the produced packages. At least one waste strip is produced during the separation process, said waste strip being stored by a waste strip winder, and the waste strip winder has a drive and at least one reel. The invention further relates to a method for winding up two waste strips onto a respective reel.

Description

[0001] Packaging machine with a waste strip rewinder with differential gear

[0002] The present invention relates to a packaging machine in which a first web of material or a trough is loaded / filled with packaging material, a sealing station which seals a further web of material to the first web of material or the trough, and a cutting device which separates the produced packaging, wherein at least one waste strip is generated during the separation process, which is stored by a waste strip winder, the waste strip winder comprising a drive and at least one spool. The present invention further relates to a method for winding two waste strips onto separate spools.

[0003] When packaging made from a web of material is separated, waste strips typically remain, for example, two edge strips and possibly one or more center strips, which must be disposed of, for example, by rewinding. Packaging machines with a waste strip winder are known from the prior art, for example from DE1922848A, which discloses helical or random winding onto spools. Waste strip winders with a dancer or dancer system are known, for example, from DE102007021517A1.

[0004] For example, DE102011010378B4 discloses a waste strip winder with only one motor.

[0005] The disadvantages of state-of-the-art packaging machines include one or more of the following aspects:

[0006] Winding at least two waste strips onto separate rollers / spools (one roller per strip) required a separate drive / motor for each roller, making the drive system complex.

[0007] Winding at least two waste strips onto separate rollers / spools with only one common drive / motor, however, led to uneven stress on the waste strips, particularly due to unequal circumferential speeds on the winding or speed and / or tension not adapted to the requirements of the respective waste strip, so that waste strips could be prone to tearing. The space requirement may also have been too large / too wide.

[0008] Winding at least two waste strips onto a single reel shared by all waste strips using only one drive / motor often resulted in very uneven winding, particularly with the diameter quickly becoming too large, necessitating premature and therefore too frequent reel changes. Furthermore, individual or all waste strips could become overloaded.

[0009] To empty the roll / spool, which was completely filled with the wound-up waste strip, or to change the roll for an empty supply roll, the packaging machine had to be stopped, which could mean a loss of time and potentially a corresponding loss of quality, at least in the packages produced immediately afterwards. The roll change was time-consuming.

[0010] It was therefore the objective of the present invention to eliminate at least one of the aforementioned disadvantages.

[0011] The problem is solved with a packaging machine in which a first material web or a trough is covered / filled with a packaging item, with a sealing station that seals another material web to another material web or the trough, and a cutting device that separates the produced packaging, whereby at least one waste strip is created during the separation process, which is stored by a waste strip winder, wherein the waste strip winder has a drive and at least one spool, and a differential gear is provided between the drive and the spool.

[0012] The statements made regarding the subject matter of the invention apply equally to the other subject matter of the invention and vice versa. Features disclosed in connection with this subject matter of the present invention may be incorporated into the other subject matter and vice versa.

[0013] The present invention relates to a packaging machine, for example, a thermoformer or a tray sealer. Such a packaging machine is, in particular, a so-called thermoformer, on which, as a rule, plastic films but also other material webs such as paper or cardboard webs are processed. In the thermoformer, a bottom film web is unwound from a supply roll and, in particular, transported intermittently along the packaging machine. In an optional forming station, a packaging recess is first formed in the bottom film web, which is then filled with a product to be packaged, in particular a foodstuff. If no recess is formed, the product to be packaged is placed on the material web. Subsequently, the packaging recess / material web is sealed in a sealing station with one or more top films, which are sealed to the bottom film.Finally, the produced packages are separated by a transverse cutter that cuts the bottom and / or top film web with a cut perpendicular to the transport direction. According to the invention, the packaging machine also has one or more longitudinal cutters that cut the packages longitudinally, i.e., parallel to the transport direction of the film web.

[0014] When packaging is separated, at least one, and usually several, waste strips remain, for example, two edge strips and / or at least one center strip, which must be disposed of after the packaging has been separated. The cross-section typically extends only slightly into these edge strips, so that the edge strip remains as an elongated shape and must be disposed of as such. The waste strip is wound onto a waste strip winder and disposed of as a roll. During this process, the waste strip is subjected to mechanical stress, particularly tensile forces.

[0015] These types of packaging machines typically operate intermittently. During processing of the material web, for example during forming or sealing, the web remains stationary for a certain period and is then advanced by a so-called "advance." Preferably, several packages are produced simultaneously during each advance. The length of the material web advanced during an advance depends on the format and size of the packages to be produced.

[0016] The waste strip winder preferably has two, three, four or more spools, each preferably holding only a single waste strip. The spools are preferably spatially separated from one another.

[0017] The waste device or waste strip winder has a drive, in particular a motor, for example a servo motor. In particular, the waste strip winder has a single drive, especially for two spools.

[0018] Furthermore, the waste strip winder features a differential gear between the drive and the spools. The differential gear has two output shafts, each driving a rotating spool. This allows the drive power to be variably distributed between the two spools.

[0019] According to a preferred embodiment of the present invention, a brake, for example a disc brake, is provided on each output shaft, which limits or reduces the rotational speed of the respective spool. This brake is preferably controllable or adjustable, and particularly preferably individually controllable and / or adjustable. Preferably, with respect to the direction of movement of the respective waste strip, a dancer is provided upstream of each spool as a material storage element and / or tensioning element for the waste strip, which is movable between two end positions. The dancer is preferably designed to store the length of a pre-drawn strip. In one end position, the dancer is essentially empty, and in the other end position, it is preferably maximally filled. The dancer typically has a static element on which at least one roller is provided, preferably rotatably.Furthermore, a dynamic element, for example a rod rotatable around a pivot point, is provided, on which at least one roller is also provided. The angular position of the dynamic element changes depending on the fill level of the dancer. However, the dancer can only consist of one dynamic element. Preferably, the angular position of the dynamic element is detected, particularly when it has reached one of its end positions. For this purpose, a sensor is preferably provided that detects the respective end position of the dynamic element.

[0020] Preferably, the sensor signal controls a brake and / or the drive. The sensor, brakes, and / or drive are preferably connected to a central control unit, such as a PLC, of ​​the packaging machine.

[0021] According to a preferred embodiment of the present invention, a guide is provided upstream of each coil, which moves alternately parallel to the axis of rotation of the coil. This makes it possible to wind the waste strip in a helical fashion and / or to use comparatively wide coils with a large storage capacity.

[0022] Preferably, the coil is divided into two parts, and the two halves can be separated for emptying the coil, so that the coil does not need to be unwound. Preferably, the core of the coil is conical.

[0023] According to a further preferred embodiment of the present invention, the drive features speed and / or torque control. This embodiment can have the advantage that at least one dancer can be dispensed with.

[0024] Another object of the present invention is a method for winding two waste strips onto separate spools, wherein the rotational speed and / or torque of a drive is variably distributed to the two spools by means of a differential gear. The descriptions given for the object of the invention apply equally to the other object of the invention and vice versa. Features disclosed in connection with this object of the present invention can be incorporated into the other object and vice versa.

[0025] According to the inventive method, the differential gear makes it possible to variably, but not independently, distribute the drive torque and / or the drive speed between the two outputs and thus between the two spools that wind up the respective waste strips. This allows the winding of the two waste strips to be synchronized.

[0026] Preferably, each spool can be selectively braked so that, for example, it does not rotate when the packaging material is stationary and / or the spool's speed is at least reduced when the corresponding dancer is empty or nearly empty. The brake on one spool can also be applied when the dancer on the other spool is full or nearly full.

[0027] The fill level of the dancer is preferably detected by at least one, preferably two sensors per dancer. The signal from these sensors can be used to control the brake and / or drive assigned to the respective spool. A signal from the propulsion of a transport device that moves the material web along the packaging machine can also be used to control one or both brakes.

[0028] According to a preferred embodiment of the present invention, the drive is speed- and / or torque-controlled. This eliminates the need for at least one, preferably both, dancers.

[0029] The inventions are explained below with reference to the figures. These explanations are merely exemplary and do not limit the general concept of the invention. The explanations apply equally to all aspects of the present invention.

[0030] Figure 1 shows the packaging machine according to the invention.

[0031] Figure 2 shows the waste strip winder.

[0032] Figures 3 and 4 show an embodiment with dancers. Figure 5 shows the differential gear.

[0033] Figures 6-8 show details of a preferred coil.

[0034] Figures 9 and 10 show an embodiment with a guide for the waste strip.

[0035] Figure 1 shows a packaging machine 1, in this case a so-called thermoformer, which optionally includes a thermoforming station 2, a filling station 7, and a sealing station 15. A bottom film web 8, here a plastic film web 8, is unwound from a supply roll and transported intermittently along the packaging machine according to the invention from right to left. In each cycle, a format of packaging consisting preferably of several columns and particularly preferably several rows is produced. The film roll is generally mounted on a shaft. In each cycle, the bottom film web 8 is advanced by a feeder of a corresponding feeder length, with several feeders being required to produce a finished package. For this purpose, the packaging machine has two transport means, in this case two endless chains, which are arranged to the right and left of the bottom film web 8.At both the beginning and the end of the packaging machine, at least one gear is provided for each chain around which the respective chain is deflected. At least one of these gears is driven. The gears in the inlet and / or outlet areas can be connected to each other, preferably by a rigid shaft. Each transport element has a plurality of clamping elements that grip the edge of the underlayer 8 in the inlet area 19 and transmit the movement of the transport element to the underlayer 8. In the outlet area of ​​the packaging machine, the clamping connection between the transport element and the underlayer 8 is released. A heating element is provided downstream of the inlet area 19 to heat the underlayer 8, particularly when it is stationary.In forming station 2, which here comprises an upper tool 3 and a lower tool 4 that has the shape / die of the packaging tray to be produced, the packaging trays 6 are formed in the heated film web 8. The lower tool 4 of forming station 2 is arranged on a lifting table 5, which, as symbolized by the double arrow, is vertically adjustable by a lifting device. Before each film feed, the lower tool 4 is lowered and then raised again. In the subsequent stage of the packaging machine, the packaging trays are then filled with the product 16 in filling station 7. In the subsequent sealing station 15, which also consists of an upper tool 12 and a vertically adjustable lower tool 11, a top film 14 is bonded to the bottom film web 8, for example, by sealing.In the sealing station, the upper and / or lower tool are lowered and raised, respectively, before and after each film transport. The upper film 14 is also unwound from a film roll mounted on a shaft and can be guided in transport devices or transported by conveyor chains, with these transport devices extending only from the sealing station and, if applicable, downstream. Otherwise, the descriptions given for the transport devices of the lower film apply. The upper film can also be heated with a heating medium and deep-drawn. For sealing, a heated sealing frame, for example, is provided as the lower tool 11. This frame has an opening for each packaging cavity into which the packaging cavity dips during sealing, i.e., during the upward movement of the lower sealing tool.For sealing, the upper and lower film webs are pressed together between the upper and lower dies 12, 11 and bond under the influence of heat and pressure. After sealing, the dies 11, 12 are moved apart vertically again. In the next stage of the packaging machine, the finished packages are separated, which in this case is done with the cross cutter 18 and the longitudinal cutter 17. The cross cutter 18 can also be raised and lowered by a lifting device 9. During the separation of the packages, a waste strip, here an edge strip 13, is produced, which is wound up by a waste strip winder 10 and then disposed of.

[0036] A waste strip winder 10 for winding waste strips 13 is shown in Figure 2 and is preferably connected to the frame of a packaging machine 1 by means of a holder 29 and fastening means 39. Alternatively, it can also be arranged separately, for example by means of feet (not shown), on the floor. The mounting / bearing of the waste strip winder is not essential to the invention. A housing / holder can be provided on the holder 29, which carries a drive 20, for example a motor or a geared motor, and on which a differential gear 23 is rotatably mounted. The drive 20 rotates the differential gear 23 about the axis 34. In the present case, the torque is transmitted to the differential gear 23 via a multi-ribbed belt / drive pulley 21 arranged on its output shaft and a multi-ribbed belt / belt 22, by the belt engaging the multi-ribbed belt pulley / pulley 24.The belt 22 can be tensioned with a belt tensioning device 69, for example with a belt tensioning wheel or by adjusting the motor lengthwise along the belt (similar to the chain tensioner on motorcycles). Details of the differential gear are shown in Figure 3. The two output shafts 27c and 27d of the differential gear 23, arranged along the axis 34, and / or the extension shafts 59c, 59d, preferably flanged to these output shafts by means of fastening means 41, each carry a winding spool / coil 25c, 25d, which is arranged rotationally fixed on an output shaft and / or extension shaft, and onto whose spool cores 51 the waste strips 13 are wound.

[0037] As shown in Figures 3 and 4, a dancer 28 can be arranged on each output side, for example on each spool 25, 25c, 25d, which exerts a tension force on the waste strip 13, for example by its own weight and / or which stores a certain length of waste strip, for example to compensate for fluctuations caused by the intermittent operation of the packaging machine. The dancer 28 is located upstream of the spool 25, 25c, 25d. For example, the dancer is arranged on the output shaft 27c and 27d of the differential gear 23 and / or on the extension shafts 59c, 59d. The dancer 28 can be rotatably mounted about the axis 34 via a lever 49, wherein a counterweight 50 can be provided on the lever, which is preferably displaceable in a receptacle 58 in order to be able to set a desired tension in the winding direction in the waste strip.Alternatively, the dancer could, for example, be designed to be linearly adjustable.

[0038] Preferably, the waste strip rewinder has at least one, preferably two, sensors 52, 53, which are designed, for example, as proximity switches, in particular inductive proximity switches. Each sensor 52, 53 can detect an end position 48a, 48b of the lever 49. In the upper end position 48a, the dancer buffer is empty and / or there is an unwanted obstruction of the waste strip, for example, in the area between the discharge of the packaging machine and the rewinder. The lower end position 48b can be detected when the dancer buffer is maximally filled, the waste strip has torn, or its end has been reached. The sensor 52 for the upper end position can be optional. The signals from at least one sensor 52, 53 can be used to control at least one of the two brakes 35c, 35d on the outputs of the differential gear 23.Both end positions 48a, 48b are preferably set such that travel reserves are provided which take into account at least reaction times, for example, for initiating braking after the upper sensor 52 has sent a signal. The dancer can alternatively be designed, for example, with additional dancer and deflection rollers, particularly to increase the capacity of the dancer, for example, for a longer lead time, and / or as a linear dancer system. Figure 5 shows an exemplary embodiment of the differential gear 23, wherein the multi-ribbed belt pulley 24 is preferably provided as an integral part of the housing 43 of the differential gear 23. Alternatively, the housing 43 and the belt pulley 24 can also be separate components, which are connected to each other in a rotationally and shear-resistant manner.For example, the multi-ribbed belt 22, engaging the multi-ribbed belt pulley 24, introduces a drive torque 44 around the axis 34e of the differential gear 23, resulting in the rotation of the gear housing 43 around the axis 34e at speed n. A person skilled in the art understands that the housing can also be driven in other ways. The differential gear 23 carries the pin 45a on which the bevel gear / drive gear 32a is mounted, which rotates angularly synchronously with the housing 43 around the axis 34e. The teeth 37a of the drive gear 32a engage on one side with the teeth 37c of the first output bevel gear / drive gear 42c. Likewise, the teeth 37a engage on the other side with the teeth of the second output gear 42d. The first output gear 42c is connected to the output shaft 27c in a rotationally and shear-resistant manner, and the second output gear 42d is similarly connected to the output shaft 27d.Both output shafts 27c, 27d are mounted in the housing 43 by bearings 46. In addition to the drive wheel 32a, a second drive wheel 32b or further drive wheels may be provided, which rotate equally around the axis 34e; the number of drive wheels depends in particular on the prevailing loads and the design of the components, for example, the gear teeth. In this example, the housing 43 is provided as a two-part housing with two preferably identical halves, each of which has a multi-ribbed belt pulley 24. During operation, preferably only one multi-ribbed belt pulley 24 is driven at any given time, while the other is held in reserve, particularly to extend its service life in the event of wear.Each output shaft 27c, 27d is acted upon by a brake 35c, 35d, which is preferably designed as a brake disc and is preferably arranged on the output shaft 27c, 27d in a rotationally and shear-resistant manner by means of fastening means 41, for example screws, and actuators 36c, 36d, which are for example supported by the housing 30, can act upon each of these brakes in a braking manner. The actuators are preferably pneumatically or electrically / electromechanically actuated and preferably act upon one or both flanks of the brake discs in order to decelerate or stop the rotation of the output shafts 27c, 27d, particularly when emptying or removing the coils 25.

[0039] The directions of rotation and speeds of the components, in particular the bevel gears and shafts, relative to the housing 30 resulting from the application of the drive torque 44 depend on the respective scenario: Scenario 1: Winding with synchronous output torques:

[0040] During the rotation of the housing 43, equal output torques 47c, 47d act on both sides of the drive wheel 32a via its toothing 37a, i.e., on the output wheels 42c and 42d. The two output torques 47c, 47d are therefore in equilibrium about the axis 34a and thus do not cause any rotation 33a of the drive wheel 32a about the axis 34a. In this case, the drive wheel 32a drives the two output shafts 27c, 27d synchronously, with the same torque and the same speed, whereby the speed of the wheels 42c, 42d about the axis 34c, 34d is equal to the speed of the housing 43 about the axis 34e. The directions of rotation 33c, 33d of the two output shafts 27c, 27d about the axes 34c, 34d are the same as the direction of rotation of the housing 43 about the axis 34e.

[0041] Scenario 2: Winder completely stopped + basic sequence of a winding cycle:

[0042] When both brakes 35c, 35d are activated and thus both output shafts 27c, 27d are stopped, then preferably the motor 20 is also stopped. Both winding coils are at zero speed. No winding takes place.

[0043] - the waste strips 13 are at least threaded into the spools 25 or already partially wound and pulled taut, with the strips being threaded through the dancers.

[0044] - the dancers 28 are waiting in their upper end position 48b, so they are “empty”

[0045] - The next feeder of the packaging machine starts, so that the film web and the waste strips are driven at the same speed and enter the dancer; - each dancer is now filled with waste strips and moves towards its lower end position without reaching it; preferably, the dancer is designed so that it can store at least one waste strip length corresponding to the feeder length, i.e., a complete feeder length can be buffered in the dancer. Should the lower end position 48b be reached, then the drive 20 is stopped and the brakes 35 are applied.

[0046] - After the packaging machine's feed has stopped, the brakes 35 are released and the drive 20 starts to wind up the waste strips (alternatively, winding starts earlier, especially if the time required for winding is longer than the time between two feeds). Winding preferably takes place at a lower speed than the feed speed, which is gentler on the waste strip than winding at feed speed.

[0047] - the drive 20 stops and the brakes 35 engage as soon as all waste strips are wound up, i.e., the dancers 28 have reached their upper end positions 48a (without using up the travel reserves there in order to conserve the waste strips).

[0048] - One winding cycle is thus completed and the next cycle can start. Scenario 3: Winder stopped on one side:

[0049] The rotation of an output shaft, for example the second output shaft 27d, is stopped, i.e., zero, for example as a result of braking triggered by sensor 52 detecting the upper end position 48a, or when a coil, here coil 25d, is to be emptied; the other output shaft 27c with coil 25c continues to rotate unbraked during this time. The drive wheel 32a rolls in the stopped output wheel 42d and consequently rotates about the axis 34a, continuing to drive the output wheel 42c with shaft 27c, thereby doubling the rotational speed of the output shaft 27c.

[0050] Alternatively, during the stop of the second drive shaft 27d, the rotational speed n of the motor 20 is halved, so that the rotational speed of the output shaft 27c does not double, but remains essentially unchanged.

[0051] Scenario 4: Winding with unequal output torques:

[0052] The two output torques 47c, 47d are unequal but not zero; as a reaction, the drive wheel 32a rotates about its axis 34a and consequently drives both output shafts 27c, 27d at different speeds 48c, 48d. The output shaft 27c, 27d, on which the lower output torque 47c, 47d acts, rotates faster than the other output shaft.

[0053] Speed ​​control / regulation of the drive 20:

[0054] Speed ​​control of the drive 20, which may be, for example, an electrically driven servo, three-phase, DC, stepper, or torque motor, or a fluid-driven motor, may be necessary, in particular to adapt the speeds provided by the drive 20 for driving the coils 25c, 25d to the properties of the waste strip, such as its strength, so that the waste strip does not tear and / or is wound too loosely or unnecessarily tightly. Especially with very thin and / or brittle and / or heavily notched / scored waste strips, gentle winding with low tensile force acting on the waste strip is necessary to prevent tearing.

[0055] Further measures may be necessary to protect particularly sensitive waste strips, for example, reducing the notch effect at deeply cut points by means of relief recesses according to WO 2017009179. As shown in Figure 6, the first, inner coil core 51c2 arranged on the extension shaft 59c is preferably only pushed onto the shaft 59c, with the torque transmission between the shaft and the coil core being effected, for example, by positive engagement of the connecting means 41 connected to the shaft 27c, in particular by screw heads in recesses 61. The second, outer coil core 52c1 is also pushed onto the extension shaft, with the torque transmission from the first to the second coil core preferably also being effected by positive engagement, for example by means of a hexagonal connection 60.To prevent axial slippage, both coil cores, which can also carry the flanges 26c1 , 26c2, are preferably secured by locking means 62, which in turn engage in a groove 63 in the extension shaft 59c.

[0056] The flanges, for example, contain at least one slot into which the beginning of a waste strip to be wound can be threaded to secure it to the spool. Preferably, however, this usual slot is omitted by clamping the waste strip in the clamping gap 71, in particular by means of a spring-loaded pressure disc 72, especially immediately before the outer spool core 52c1 is pushed against its end stop on the extension shaft. After the locking device 62 is engaged, the maximum clamping force of the spring-loaded pressure disc acts on the waste strip.

[0057] Figure 7 shows an exemplary positive-locking connection 60 between the two coil cores (51 c1 , 51 c2) as a hexagonal connection.

[0058] Tool-free emptying of the coil 25 is shown in Figure 8. At least the outer coil core 51c1 or both coil cores are removed from the extension shaft 59c and either pushed back onto the shaft after emptying or directly replaced with empty replacement coil cores.

[0059] For this purpose, the tab 62 is pressed against the force of the spring 64 until the larger diameter of the keyhole contour 65 is concentric with the outer diameter of the shaft 59c, i.e., disengages from the circumferential groove 63, so that the outer coil core 51c1 can be pulled off the shaft. Then the inner coil core 51c2 is also pulled off; alternatively, both coil cores are pulled off together.

[0060] The coil cores are attached in reverse order, after which the tab 62 is finally released and pressed into its outer end position by the force of the spring 64. The tab, with its smaller diameter 68, engages again in the groove 63 of the shaft 59c with the key contour 65, thus securing the coil cores axially on the shaft. The helical winding is shown in Figure 9.

[0061] The waste strip 13 is preferably guided around a deflecting roller 75 by an adjustable ring 73. During the winding of the waste strip, the ring 73 is alternately adjusted in the direction 76 transversely to the winding spool 25, so that the waste strip is wound alternately, and in particular uniformly, onto the spool cores 51c1, 51c2 between the flanges 26c1, 26c2. The uniform winding allows a large volume of waste strip to be wound, so that the spool has to be emptied / changed much less frequently compared to uneven winding.

[0062] In the embodiment according to Figure 10, the coil is moved as an alternative or in addition to the embodiment according to Figure 9, and the ring is provided in a fixed position.

[0063] Reference symbol list:

[0064] 1 packaging machine

[0065] 2 forming station, deep-drawing station

[0066] 3 Upper tool of the deep drawing station

[0067] 4 lower tools of the deep drawing station

[0068] 5 Lifting table, carrier of a tool of the sealing, deep drawing station and / or the cutting device

[0069] 6 packaging trays

[0070] 7 first filling station

[0071] 8 first material web, film web, underfilm web

[0072] 9 Lifting device

[0073] 10 Waste strip winders, waste strip winding device, winding device, residual strip winders, edge strip winders, winders

[0074] 11 Sub-tools of the sealing station

[0075] 12 Upper tool of the sealing station

[0076] 13 Waste strips, residual strips, edge strips, center strips

[0077] 14 Material web, top film web, lid film

[0078] 15 Sealing Station

[0079] 16 Packaged goods

[0080] 17 longitudinal cutters

[0081] 18 cross cutters

[0082] 19 Entrance area

[0083] 20 Drive, motor, geared motor

[0084] 21 Drive wheel, belt pulley, bevel gear, spur gear

[0085] 22 Drive belts, multi-ribbed belts, timing belts, flat belts, belts

[0086] 23 Differential gear, differential, gearbox

[0087] 24 Multi-ribbed belt pulley, belt pulley, gear

[0088] 25, 25c, 25d Winding reel, winding spool, spool, roller, supply roll

[0089] 26, 26c1, 26c2 Rim disc

[0090] 27, 27c, 27d Output shaft

[0091] 28 dancers, deflection, pulley

[0092] 29 brackets, frames

[0093] 30 housings, brackets

[0094] 31 warehouses, storage

[0095] 32, 32a, 32b Drive bevel gear, drive wheel, bevel gear

[0096] 33, 33a, 33c, 33d, 33e Direction of rotation, 34c, 34d, 34e Axis, axis of rotation, 35c, 35d Brake, brake disc c, 36d Brake, brake caliper, brake pad, eddy current brake, actuator, 37c Gearing Machine frame Mounting, screw connection Seal Fastening means, screw connection, 42c, 42d Output bevel gear, output gear, bevel gear Housing (of the differential gear), two-part housing Drive torque, 45a Pin Bearing, bearing c, 47d Output torque, 48a, 48b End position, upper end position, lower end position Lever Counterweight, 51 c1, 51 c2 Spool core, waste strip holder Sensor 1 Sensor 2 Run-up point Direction of travel of the waste strip Winding direction Swivel direction of the dancer Receptacle for counterweight c, 59d Extension shaft Connecting element, Hexagonal connection Recess, Bore Tab, Detent, Locking mechanism Keyway Spring Keyhole contour Direction of movement Larger diameter Smaller diameter Belt tensioning device Bearing, Bearing Clamping gap Clamping piece,Pressure disc, spring-loaded pressure disc, adjustment mechanism, adjusting ring, flushing, wound waste strip, helical winding, random winding, deflection pulley, adjustment direction

Claims

Patent claims:

1. Packaging machine (1) in which a first material web (8) or a trough is covered / filled with a packaging item (16), with a sealing station (15) which seals a further material web (16) to the material web (8) or the trough and a cutting device (17, 18) which separates the produced packaging, wherein at least one waste strip (13) is produced during the separation, which is stored by a waste strip winder (10), wherein the waste strip winder (10) has a drive (20) and at least one spool (25, 25c, 25d), characterized in that a differential gear (23) is provided between the drive (20) and the spool (25, 25c, 25d).

2. Packaging machine (1) according to claim 1 , characterized in that the waste strip winder (10) has two spools ((25, 25c, 25d) each provided on an output shaft (27, 27c, 27d) of the differential gear (23).

3. Packaging machine (1) according to claim 2, characterized in that a brake (35) is provided on each output shaft (27, 27c, 27d), which is preferably individually controllable.

4. Packaging machine (1) according to one of the preceding claims, characterized in that a dancer (28) is provided upstream of each coil (25, 25c, 25d) which is movable between two end positions (48a, 48b).

5. Packaging machine (1) according to claim 4, characterized in that a sensor (52) detects the end positions (48a, 48b) in each case.

6. Packaging machine (1) according to claim 5, characterized in that the signal from the sensor (52) controls a brake (35) and / or the drive.

7. Packaging machine (1) according to one of the preceding claims, characterized in that a guide (73) is provided upstream of each coil (25, 25c, 25d) which moves alternately parallel to the axis of rotation of the coil (25, 25c, 25d).

8. Packaging machine (1) according to one of the preceding claims, characterized in that the coil (25, 25c, 25d) is divided into two parts.

9. Packaging machine (1) according to claim one of the preceding claims, characterized in that the drive has a speed and / or torque control.

10. Method for winding two waste strips (13) onto one coil each (25, 25c, 25d), characterized in that the rotational speed and / or torque of a drive (20) is variably distributed to the two coils (25, 25c, 25d) by means of a differential gear (23).

11. Method according to claim 10, characterized in that each coil is selectively braked.

12. Method according to claim 10 or 11, characterized in that a dancer (28) is provided upstream of at least one coil, preferably each coil, which stretches and / or at least partially stores the waste strip.

13. Method according to one of claims 11 or 12, wherein the fill level of the dancer controls or regulates a brake (35) and / or the drive (20).

14. Method according to one of claims 10 or 11, characterized in that the drive is speed- and / or torque-controlled.

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