EP3070008A1 - Wrapping device and its working method - Google Patents

Abstract

There is provided a wrapping apparatus with a guide of an unwinder (1) of a film web (2) of a film roll (3) to be unwound along an orbit (4) about a body (5; 6) to be wrapped, and a working method practicable therewith require a significantly lower construction and operating costs, but have a large variability in wrapping bodies of arbitrary dimensions and proportions, which is achieved in that the leadership of at least two separate, an unwinder (1) in each case at least in two directions (x; y Moving systems (7) is formed, each having a controllable holding device (8) for a retaining flange (9) of the unwinder (1) having two separate retaining flanges (9), the wrapping device comprises a process computer, with the leadership of the Abwicklers (1) along a freely determinable orbit (4) can be generated and he after a partial circulation of a Movement system (7) to the next movement system (7) can be transferred, so that with the movement systems (7) a full circulation on the orbit (4) can be generated.

Description

The invention relates to a wrapping apparatus and its working method according to the preambles of claims 1 and 10.

In order to protect products eg from the metal, plastic, wood or tire industry from damage during transport and storage, they are wrapped at the end of a production line with packaging materials such as films, nonwovens, crepe paper or corrosion preventive materials. To make the wrapping economical, wrappers are used for this purpose. A known wrapping device, DE 699 01 667 T2 Fig. 1 comprises an oval guide of a reel of a film web from a film roll to be unwound, whereby it is necessary to be able to control the unwinder through the opening for wrapping bodies with through openings, such as tires or rolls of metal strips, so-called coils; what the known leadership must be divided into two, to be passed through the opening in the body to be wrapped can.

A disadvantage of this known wrapping is not only the considerable mechanical engineering effort to produce a divisible guide for an unwinder, but also the low flexibility of the wrapping process executable thereby, as this leads, for example, in very flat products to a much shorter distance, the role per revolution must be covered, which then no longer ensures that the tension in the packaging material can be maintained, so that it can break down causing the packaging material uncontrolled and tensionless, creating wrinkles and pockets on the body to be wrapped.

The object of the invention is to provide a wrapping apparatus and a work method that can be carried out with it, which require a considerably lower construction and operating costs, but allow a great variability and flexibility in wrapping bodies of arbitrary dimensions and different proportions.

The solution of this object is achieved according to the invention with the features of the preambles in connection with the technical features of the characterizing parts of claims 1 and 10th

With the inventive wrapping apparatus, a freely selectable orbit of a stripper of a film web from a roll of film to be unwound around a body to be wrapped or through an opening in such a body to be wrapped, such as annular products such as tires or coils, can be achieved, since the guidance of a Unwinder is provided via a connected process computer. The new wrapping device makes it possible to individually adapt the movement of a unwinder to the optimum orbit around a body to be wrapped, as well as the possibility of being able to control the unwinder directly through an opening in the body to be wrapped.

By virtue of the fact that the guidance of at least two separate movement systems, which move at least in two directions (x; y) within one plane, is formed, each movement system has a controllable holding device for a holding flange of the unwinder and the unwinder has two separate holding flanges and the wrapping device has a process computer with which the guide the unwinder can be generated along a freely determinable orbit and the unwinder after a partial circulation of its orbit of a movement system to the next movement system can be transferred to a further partial circulation and with all movement systems a full circulation on the orbit can be generated, an orbit can be selected, the Product contour is optimally adapted, so that even very wide and very thin products can be wrapped without a roll of film would have to cover unnecessarily long circulation paths or breaks the tension in the film web.

In addition, as an objective career formed leadership of a liquidator falls completely away, so that it can be freely controlled and through openings in a body to be wrapped.

Therefore, in the inventive wrapping device, there are no restrictions on the product geometry, since the orbit can be optimally adapted to them, as well as the total structural dimensions of the wrapping are very low, without additional structural measures would be necessary for particularly wide or flat product geometries. Furthermore, due to the automatic holding devices, a change of the film roll can be easily automated. This device thus has an optimized travel path around the product contour and requires only a low energy consumption with reduced processing times under assuring consistent winding material tension. Further, the inventive wrapping apparatus allows the unwinder to be controlled with the film roll through relatively small openings in bodies to be wrapped or wrapped.

Further advantageous embodiments of the subject of the invention will become apparent with and in combination from the following subclaims. According to a particularly preferred embodiment of the invention, a movement system consists of at least two intersecting, relatively movable uniaxial linear systems, which are arranged approximately on a cross-table-like connecting component at a right angle or at adjustable angles, so that the holding devices on the two linear systems in Two directions can move within a plane, which allows the freely selectable orbit.

Advantageously, a movement system can also consist of a multi-axis robotic arm and different movement systems can simultaneously be used in a wrapping device, just as various wrapping devices with different holding, gripping or coupling devices can be equipped with the adapted holding or coupling flanges, so that a total of several Kinematics and an optional division of the travel paths is possible.

In an advantageous arrangement of two movement systems on both sides of a body to be wrapped and an embodiment of a first linear system as a vertical column columns with adjustable in the Y direction second, in the horizontal X-direction movable linear system with end-side holding device for a developer, can be a movement of a working process realize, with a Abwickler a film web can be alternately transferred from a movement system to the other movement system, each circulating a Teilumlaufbahn a unwinding film roll to be wrapped around a body after passing the unwinder against the direction of rotation of the unwinder this on the other side of the To meet again to umwindelnden body and to be coupled again, so after releasing the previous movement system this also bypasses the body to be wrapped in the opposite direction to take over the unwinder on the opposite side again.

Particularly preferred here is an embodiment in which the holding devices, the retaining flanges and the unwinder have only such large external dimensions that they still durchsteuerbar through narrow openings of a body to be wrapped and the transfer along a transfer path 'xÜ' in, front and / or behind an opening of a body to be wrapped is feasible.

The inventive wrapping device can be advantageously extended with further device for moving the unwinder in other spatial directions, such as in each vertical Z-direction of the Y-pillars to the two main directions of movement, to which then the rotation of the uniaxial linear systems can be added to their own longitudinal axes.

Preferably, at least one movement system can be controlled in a change position of the unwinder for receiving a new film roll, whereby a film change is much faster and safer to carry out.

Fig. 1

eine Skizze einer Einwickelvorrichtung beim Einwickeln eines Coils,

Fig. 2

die Einwickelvorrichtung gemäß Fig. 1 beim Einwickeln eines flachen Körpers in einem zweiten Verfahrenszustand, und

Fig. 3

die Einwickelvorrichtung gemäß Fig. 2 in einem dritten Verfahrenszustand.

Hereinafter, the wrapping apparatus and the working method will be described with reference to figures. Show it:

Fig. 1

a sketch of a wrapping device when wrapping a coil,

Fig. 2

the wrapping device according to Fig. 1 when wrapping a flat body in a second process state, and

Fig. 3

the wrapping device according to Fig. 2 in a third process state.

The wrapping apparatus shown by way of example here consists of two separate movement systems 7, each formed by two crosswise arranged uniaxial linear systems 10, 11, each of which a first linear system 10 acts as a vertical column stand in a vertical Y-direction and a second linear system 11 in horizontal X-direction is arranged movably thereto and wherein both movement systems 7 are arranged on both sides of a body to be wrapped 5; 6. The mutually facing end faces of the horizontal linear systems 11 are equipped with holding devices 8, which in turn correspond to retaining flanges 9 of the unwinder 1, so that it can be moved along a guide generated by a connected process computer along a freely selectable orbit 4 and for a film web 2 to be unwound film roll 3 a constant pull-off voltage can be ensured during the entire wrapping process, without the risk that a part of the film web can only create uncontrolled and stress-free to the body 5, 6 to be wrapped.

From a first movement system 7, shown in the figures on the left, an unwinder 1 is moved during a continuous unwinding of a film web 4 of a film roll 3 along a first partial orbit around a body 5, 6 to be wrapped and at the end of the first partial circulation path to a second movement system , shown on the right in the figures, which moves the unwinder 1 along a second partial orbit further around the body 5; 6 to be wrapped, while the first movement system 7 moves back around the body 5, 6 to be wrapped or the second movement system 7 towards the end meets its second partial orbit and takes over there the unwinding 1, whereupon the second movement system approaches the wrapping body 5 back and the first movement system towards the end of the first partial orbit again, the unwinder 1 takes over again, after which the working procedure is repeated.

The transfer takes place along a transfer area 'xÜ' by an automatic coupling of the receiving holding device 8 to the respective retaining flange 9 of the unwinder 1 and only a subsequent uncoupling of the other holding device 8 of the corresponding retaining flange 9 with continuously moving unwinder 1, so a Zugspannungsverlust in the film web 2 can be safely excluded.

The movement systems 7 can be steered around arbitrarily shaped bodies 6 or else through bodies 5 provided with eyes or openings 12, wherein a transfer of the unwinder 1 can also take place within or also behind and / or behind an opening 12.

The movement speed vR of the respective free movement system 7 counter to the circumferential direction of the unwinder 1 on the orbit 4 or along a free return path is at only two movement systems 7 at least until shortly before the mutual contact of the holding devices 8 of the linear system 11 with the retaining flange 9 of the unwinder 1 clearly higher than the peripheral speed vU of the unwinder 1, wherein the transfer in a transfer area xÜ in each case above and below a body 5 or within and below a body 6 sets. In order to keep the withdrawal tension of the film web 2 constant, the unwinder 1 changes its braking torque proportionally to the amount of film material on the film roll 3, since with a constant braking torque the tension would undesirably increase due to the decreasing radius of the film roll 3 during unwinding. In the Using more than two motion systems (7), the return speed vR and also the return path can be freely selected.

As in Fig. 1 4, the movement systems 7 can be equipped with additional degrees of freedom in the Z direction perpendicular to the X and Y directions or perpendicular to the plane of the sheet, as well as the rectangular linear systems 10, 11 can be pivoted manually or by motor via the rotation angles α1 and α2 the linear systems 10, 11 can themselves be configured to be rotatable manually about their vertical axes β1 and β2.

When using two or more than two movement systems 7, the method is such that the first movement system 7 with an unwinder 1 held thereon during a continuous unwinding of a film web 2 from a film roll 3 to be unwound along a first partial circulation path around a body 5 to be wrapped 6 moves and at the end of the first partial orbit passes to another movement system 7, which continues to the unwinder 1 along another Teilumlaufbahn around the wrapped body 5; 6, while the first movement system 7 moves back to the body to be wrapped 5; 6 and a last movement system 7, in two movement systems the second, at four the fourth, comes to the end of his last partial orbit and then takes the unwinder 1 again, the respectively previously in operation movement system 7 after delivery of the unwinder 1 to its partial orbit another way to wrap that up the body 5; 6 moves back and the respective previous movement system 7 comes to the end of its partial orbit and the unwinder 1 takes over, so that this travels around a closed orbit 4 after passing through all partial orbits of all movement systems.

Claims (14)

A wrapping apparatus comprising a guide of an unwinder (1) of a film web (2) of a film roll (3) to be unwound along an orbit (4) about a body (5; 6) to be wrapped, characterized in that the guide of at least two separate ones Unwinder (1) each at least in two directions (x; y) within a plane moving movement systems (7) is formed, each movement system (7) has a controllable holding device (8) for a retaining flange (9) of the unwinder (1) and the unwinder (1) has two separate holding flanges (9), the wrapping device has a process computer, with which the guide of the unwinder (1) along a freely determinable orbit (4) can be generated and that the unwind (1) after a partial circulation of its orbit (4) from a movement system (7) to the next movement system (7) can be transferred to a further partial circulation and with all movement systems (7) a full circulation in the orbit ( 4) can be generated. A wrapping apparatus according to claim 1, characterized in that a movement system (7) consists of at least two intersecting, relatively movable uniaxial linear systems (10, 11). A wrapping apparatus according to claim 2, characterized in that the two linear systems (10; 11) of a movement system (7) intersect at a right angle or at adjustable angles (α1; α2). Wrapping device according to one of the preceding claims, characterized in that a movement system (7) consists of a multi-axis robotic arm. Wrapping device according to one of the preceding claims, characterized in that two movement systems (7) are arranged on both sides of a body (5; 6) to be wrapped. Wrapping device according to one of the preceding claims, characterized in that a first linear system (10) of a movement system (7) as a vertical column stand with adjustable in the vertical Y-direction second linear system (11) movable in the horizontal X direction holding device (8) for a Unwinder (1) is formed. Wrapping device according to one of the preceding claims, characterized in that the holding devices (8) and the unwinder (1) with its retaining flanges (9) through openings (12) of a body to be wrapped (5) hindurchsteuerbar and the transfer along a transfer path (xÜ) in , forward and / or behind an opening (12) of the body to be wrapped (5) is feasible. Wrapping device according to one of the preceding claims, characterized in that the movement systems (7) are equipped with further devices for moving the unwinder (1) in other spatial directions. Wrapping device according to claim 8, characterized in that at least one movement system (7) in a change position of the unwinder (1) for receiving a new film roll (3) is controllable. Working method of an egg winding device according to one of the preceding claims, characterized in that a first movement system (7) with an unwinder (1) held thereon during a continuous unwinding of a film web (2) from a unwinding film roll (3) along a first partial recirculation a body to be wrapped (5; 6) is moved and at the end of the first partial orbit passes to another movement system (7), which continues the unwind (1) along another Teilumlaufbahn around the body to be wrapped (5; 6), while the first Movement system (7) moves back around the body to be wrapped (5; 6) and a last movement system (7) to the end of its last partial orbit and the unwinder (1) takes over again, whereupon the previous previous in operation movement system (7) Dispensing of the unwinder (1) around its partial orbit or in some other way around the body to be wrapped (5; 6) moves back and the respective previous movement system (7) comes to the end of its partial orbit and the unwinder (1) takes over again, so that this bypasses after passing through all partial orbits a closed orbit (4). Working method according to claim 10, characterized in that the transfer by an automatic coupling of the holding device (8) to the retaining flange (9) of the unwinder (1) and a subsequent release of the respective other holding device (8) from the second holding flange (9) of the unwinder ( 1). Working method according to one of the preceding claims 10 to 11, characterized in that the rotational speed of the unwinder (1) is kept constant during the transfer along a transfer area xÜ. Working method according to one of the preceding claims 10 to 12, characterized in that the rotational speed of the unwinder (1) along the partial circulation paths is kept constant or varied. Working method according to one of the preceding claims 10 to 13, characterized in that the holding devices (8) of the movement systems (7) are guided through an eye or an opening (12) of the body to be wrapped (5) and a transfer within, before and / or or behind an opening (12).

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