EP0563649A2 - Method and apparatus for forming a closed wrap around an article - Google Patents

Abstract

To form a closed wrap around an article (R), there are proposed a method and an apparatus, in which the article is positioned with its underside on a spread-out flat-material sheet (102), in such a way that laterally projecting part regions of the flat-material sheet (102) are present in the region of the lateral faces of the article (R). During the lowering of the article which is arranged on the lowerable supporting region, the flat-material sheet is laid against the lateral faces of the article. As a result of a lateral displacement of the article (R), the flat-material sheet can then be applied to the top side of the article (R). Subsequently, the ends of the flat-material sheet which are guided up against one another are connected together. During the lateral displacement of the article (R), a transverse fold is imparted to the flat-material sheet (102) at a deflecting edge (132). <IMAGE>

Description

The invention relates to a method and an apparatus for forming a closed envelope around an object.

A known device of this type is used for wrapping paper giants with a suitably cut packaging paper sheet. The wrapping paper sheet is provided in such a way that a corresponding length is first measured from a wrapping paper band and then cut off. This makes it necessary to interrupt the feed movement of the wrapping paper sheet or wrapping paper tape. The wrapping cycle for the object in a wrapping device follows the provision of the wrapping paper sheet. In particular in the case of paper giants consisting of individual sheets, care must be taken that the sheets of the paper giant are not damaged during the wrapping of the paper giant with the wrapping paper sheet.

The invention is based on the object of proposing a method and a device with which damage to the object during the wrapping step can be prevented.

To achieve this object, a method with the features of claim 1 is proposed. In the method according to the invention, the object is positioned with its underside on a spread sheet of flat material, in particular a wrapping paper sheet, in such a way that in the region of the side surfaces of the object there are laterally projecting partial areas of the sheet of flat material which essentially correspond to the area to be covered. The object is then lowered and the sheet of flat material is placed on the side surfaces of the object. The sheet of flat material is then applied to the top of the object by lateral displacement of the object. The ends of the flat material sheet that are brought together are then connected to one another. This procedure creates a tubular envelope which then only has to be closed on the end faces of the object to be encased.

In order to ensure a good and damage-free application of the flat material sheet to the side surfaces of the object, the side surfaces are advantageously stiffened with a compression force acting on the top of the object when the object is lowered. This is particularly advantageous in the case of a paper giant consisting of individual sheets, since the application of the compression force prevents the individual sheets from being displaced while the wrapping paper sheet is being applied.

When lowering and / or moving the object, a protruding, larger partial area of the flat material sheet is advantageously pulled off a stationary support area. In order to ensure that the flat material sheet is applied to the object in a wrinkle-free manner, the larger portion of the flat material sheet is pulled off the stationary support area against the force of a holding means. In particular in the area of the front upper edge of the object, the application of the sheet of sheet material can be improved by keeping the sheet of sheet material taut when it is applied to the top of the item. When moving the object against the flat material sheet, a crease-free application of the flat material sheet on the top of the object can thus be guaranteed.

In order to prevent wrinkling of the individual paper sheets of the wrapping paper giant in the area of the upper front edge, it is proposed that a transverse fold be impressed in the area of an upper edge of the object when the flat material sheet is placed on the top of the object. In this case, the transverse fold can be impressed on the flat material sheet with a height and / or offset to the upper edge of the object.

In an embodiment of the invention, the wrapping step is preceded by a feed step for the flat material sheet, in which the object is advantageously fed together with the flat material sheet. As a result, the object is protected during its feeding movement by the sheet of sheet material arranged underneath.

An interruption of the feed movement for measuring and separating the sheet of flat material can be avoided by that the sheet of flat material is connected to a sheet of flat material via a perforation, which is separated when the sheet of flat material is fed, in particular by blocking the feed device for the sheet of flat material. The sheet of flat material can advantageously be measured and perforated from the sheet of flat material during the wrapping step of a previous object. As a result, the objects to be wrapped can be fed in a faster time sequence since the feed movement of the wrapping paper sheet or the object does not have to be interrupted in order to separate the perforation.

The object is advantageously positioned with respect to the flat material sheet during the feeding of the flat material sheet.

During the feeding of the sheet of flat material, at least one protruding partial area of the sheet of flat material can be provided with an adhesive strip, which is advantageously applied in the area of an edge. With the adhesive strip, the end regions of the wrapping paper sheet brought together can then be closed to form a tubular envelope.

The lateral displacement of the object for placing the sheet of flat material on the top of the object advantageously takes place perpendicular to the feed movement of the object.

To achieve the object of the invention, a device with the features of claim 6 is also proposed. The device according to the invention has a two-part contact surface which has an adjustable contact area and a stationary contact area. The contact surface is advantageously aligned horizontally and a vertically adjustable support area is provided. At the beginning of the wrapping step, the sheet of flat material is spread out on the support surface, the object to be wrapped resting on the sheet of flat material. Here, the object is positioned such that its one side surface lies at the level of the dividing line between the two support areas. When the retractable support area is lowered, the object is thus also lowered, the sheet of flat material lying on the stationary support area being placed against the side area of the object.

In a further embodiment, the adjustable support area has recesses into which, when the support area is adjusted, an application means for applying the sheet of flat material to the object is introduced. Thus, the application means serves to apply the sheet of flat material to the other side area of the object. In this case, an application means can be provided which consists of two combs which can be adjusted relative to one another. By means of the relative adjustment of the combs to one another, a region of the sheet of flat material slightly projecting above the top of the object can be placed on the top of the object.

In a further embodiment, the contact means can be movable in the recesses of the adjustable support area. Thus, the object for applying the sheet of flat material on its upper side can be moved laterally with the application means. Here, the contact means can be moved transversely to the feed direction of the object. In one embodiment, the contact means has, on the one hand, combs with approximately L-shaped teeth and, on the other hand, combs with an inverted L-shaped teeth. In a merged position, the teeth of the combs can advantageously form a deflection edge for the flat material sheet. The In the merged position of the combs, the deflection edge ensures that a protruding partial area of the flat material sheet is applied to the top of the object.

For packaging objects of different dimensions, it can be provided that the distance between the contact means and the adjustable support area is adjustable. Here, an adjustment device can be provided with which a guide for the contact means can be adjusted.

In order to avoid damage during the application of the flat material sheet to the side regions of the object, which is particularly advantageous in the case of a paper giant consisting of single sheets, a pressing means is provided which exerts a compressive force on the side regions of the object. Here, for example, a pneumatically actuated pressure stamp can be used. The pressing means is advantageously movable perpendicular to the adjustable support area and is preferably arranged on guides for grippers. The pressing means is only used in the phase of the wrapping step when the flat material sheet is placed on the side areas of the object.

In a further embodiment, the pressing means can be designed with a deflecting means for applying a transverse fold to the flat material sheet, which preferably has a deflecting edge. The deflecting means can be positioned above and / or laterally offset to the upper edge of the object. Particularly good placement of the flat material sheet is thus achieved in the region of the upper edge of the object, damage to the individual sheets being avoided, in particular in the case of a paper giant.

In a further embodiment, a deflecting rod is assigned to the deflecting means and is adjustable with respect to the deflecting means. Here, the deflection means can interact with an adjustable transport means, in particular a conveyor belt, for the object.

The stationary support area which receives a partial area of the flat material sheet advantageously has a lattice structure which preferably has a support rail for the flat material sheet which is assigned to the adjustable support area.

The partial area of the flat material sheet lying on the stationary support area is advantageously held with a holding means. In order to avoid contact with an applied adhesive strip in the final phase of the application of the flat material sheet, the holding means is advantageously designed to be movable.

Below the stationary support area, a means of transport is provided for taking over the object coming from the adjustable support area. Here, the transport means can have two spaced conveyor belts, one of the conveyor belts advantageously being adjustable in height to the other conveyor belt. In a further embodiment, an upper conveyor belt can be provided, which is adjustable in the horizontal direction and can advantageously be delivered to the deflection means for the flat material sheet. As a result, an additional deflecting rod for applying a transverse fold can be dispensed with.

The sheet of flat material and the object can be fed by means of a feed means, which preferably has grippers, each of which has controllable gripping arms. Here, the feed means can be moved perpendicular to the displacement movement of the object in the wrapping device. The feed means can be guided on guides which are arranged above the support surface, the external guides advantageously being adjustable in the lateral direction. As a result, the device can be easily adapted to the respective size of the object to be wrapped.

The feed means is advantageously arranged on hollow profile supports in which the drive means driving the feed means is arranged.

In order to ensure the precise application of the sheet of sheet material to the object, it must be positioned opposite the sheet of sheet material. The support surface is advantageously adjacent to a support bench which is assigned an adjustable stop for the object. The stop has lateral guides for positioning the object. With the guides, the object can be aligned so that it lies with one of its side surfaces on the dividing line between the two support areas before the actual wrapping step.

Furthermore, the device can be provided with a distributor for applying an adhesive strip. This is advantageously arranged on a gripper guide.

Fig. 1

eine schematische Seitenansicht einer Ausführungsform der erfindungsgemäßen Vorrichtung, teilweise in geschnittener Darstellung,

Fig. 2

eine Ansicht der Ausführungsform in Richtung des Pfeiles II gemäß Fig. 1,

Fig. 3

eine Draufsicht auf die Ausführungsform gemäß Fig. 1,

Fig. 4 und 5

eine schematische Darstellung der Umhüllungseinrichtung bei einer weiteren Ausführungsform in verschiedenen Verfahrensschritten,

Fig. 6

eine weitere Ausführungsvariante einer Umhüllungseinrichtung,

Fig. 7

eine vergrößerte Darstellung der Zuführeinrichtung der Vorrichtung gemäß Fig. 1,

Fig. 8

eine schematische Darstellung, aus der die Positionierung eines Gegenstandes R auf einem Packpapierbogen 102 vor dem Umhüllungszyklus hervorgeht und

Fig. 9

eine Variante des in Fig. 7 gezeigten Details.

These and further features emerge from the claims and also from the description and the drawings, the individual features being realized individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields and being advantageous and capable of being protected Representations for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. Show it:

Fig. 1

2 shows a schematic side view of an embodiment of the device according to the invention, partly in a sectional view,

Fig. 2

2 shows a view of the embodiment in the direction of arrow II according to FIG. 1,

Fig. 3

2 shows a top view of the embodiment according to FIG. 1,

4 and 5

1 shows a schematic representation of the wrapping device in a further embodiment in different method steps,

Fig. 6

another embodiment of a wrapping device,

Fig. 7

2 shows an enlarged illustration of the feed device of the device according to FIG. 1,

Fig. 8

is a schematic representation showing the positioning of an object R on a wrapping paper sheet 102 prior to the wrapping cycle and

Fig. 9

a variant of the detail shown in Fig. 7.

Figures 1 and 3 show a schematic representation of a device for wrapping paper giants R with a sheet of sheet material hereinafter referred to as wrapping paper 102, which could also consist of materials other than paper. It is designed as an automatic packaging machine. The packaging machine shown has a lifting table 50 on which a multiplicity of paper giants R are stacked one on top of the other. The individual paper giants R are separated from one another at their one end region by inserts S. The height of the lifting table 50 can be adjusted in the direction of the arrow 51. Here, the lifting table 50 is driven such that the displacement takes place by the thickness H of the paper giant R and the bottom of the uppermost paper giant R is coplanar with a support bench 1 adjacent to the lifting table 50.

The support bench 1 has approximately an L-shaped cross section, a horizontal support surface for the paper giant R being provided. A feed device 17 for feeding and measuring a wrapping paper or flat material band 2 is provided below the support bench 1. The feed device 17 has two unwinding rollers arranged one above the other, which are provided with a drive, not shown in detail. The wrapping paper tape 2 is pulled off a wrapping paper reel 16 by the rotational movement of the unwinding rolls. The wrapping paper tape 2 is deflected in the direction of the feed device 17 on a deflection roller 52. The unwinding rolls of the feed device 17 are coupled to a measuring device (not shown in detail), so that the length of the wrapping paper tape 2 supplied can be measured precisely.

In addition to the feed device 17, a cutting device 18 is arranged, which can actuate the wrapping paper tape 2 with a transverse perforation E running transversely to its longitudinal direction or the like. The transverse perforation E in the wrapping paper tape 2 is selected such that the wrapping paper tape 2 still has sufficient stability. In practice, good results have been achieved if the transverse perforation has incisions of approximately 50 to 50 mm in length, which are interrupted by bridges which are between 1 and 3 mm in length.

A tensioning roller 19 is arranged laterally offset to the cutting direction 18 and is adjustable in the direction of the double arrow 53. The packaging paper tape 2 coming from the cutting device 18 is deflected on the tensioning roller 19 and lies on the top of the support bench 1. The tensioning roller 19 has the task of keeping the wrapping paper tape 2 fed via the feed device 17 taut. For example, a tensioning roller 19 bearing against gravity or spring force can be provided. This is achieved in that the height of the tensioning roller 19 is adapted to the length of wrapping paper 2 that has been unwound. In Fig. 1, two working positions of the tension roller 19 are shown. These working positions are each adapted to different working cycles of the packaging machine. If the tensioning roller 19 is in its lower position shown in broken lines, the wrapping paper tape 2 is guided past a sensor 22. The position of the tensioning roller 19 can be detected with the sensor 22.

Carriers 10, 110 of a support structure, not shown, are arranged above the support bench 1 and are fastened to the bottom of the packaging machine. The horizontally aligned supports 10, 110 are positioned parallel to one another. As can also be seen from FIG. 2, guides 9, 109, 209 are held on the carriers 10, 110. The guides 9, 109, 209 each have an approximately rectangular hollow profile body which is arranged on the supports 10, 110 in an adjustable manner. By adjusting the outside Guides 9, 109 can thus be adapted to the respective format of the paper giant R.

A pincer-shaped gripper 6, 7, 8 is guided on the guides 9, 109, 209 in the transport direction of the paper giant R. As can be seen from FIG. 1, the gripper 6, which is basically of the same design as the grippers 7 and 8, has tongs-like gripping arms. The gripper arms of the gripper 6 limit a receptacle for a paper giant R fed from the lifting table 50. While the grippers 6, 7 have the same dimensions, as can be seen from FIGS. 2 and 3, the gripper 8 is of substantially smaller design, since between its gripper arms only the wrapping paper tape 2 is clamped.

The grippers 6, 7, 8 can be actuated synchronously in the direction of the arrow 54, which also identifies the transport direction of the paper giant R. The design of the gripper drive is to be described, for example, for the gripper 6 with reference to FIG. 1. A belt 13 or the like is arranged within the guide 9, which is designed as a hollow body, and is designed to be endless. The belt 13 is guided around the rollers 11, 12 which are arranged at a distance from one another. Here, the roller 12 is driven by a drive belt 14. The drive belt 14 is connected to a central drive unit, not shown.

The belt 13 is articulated on the gripper 6 by means not shown in detail. If the roller 12 is driven by the drive belt 14, the gripper 6 can be transferred from the position shown in broken lines in the direction of arrow 54 to the position shown in the drawn line.

Perpendicular to the upper side of the support bench 1, a stop as shown in FIGS. 1 and 3 is provided, the stop elements 15, 115 of which are retractable and are arranged, for example, on the devices carrying the grippers 6, 7. 3 shows that the stop elements 15, 115 are arranged at a distance from one another which is adapted to the dimensions of the paper giant R. Each of the stop elements 15, 115 has lateral guide cheeks 55 for the paper giant R. An oblique course of the free end region of the guide cheeks 55 delimits an insertion cross section for the paper giant R that tapers in the direction of the arrow 54.

Laterally offset to the stop elements 15, 115, rollers 3, 103 are mounted on a common axis, which are each provided with a backstop. The rollers 3, 103 hold the wrapping paper tape 2 in contact with the top of the support bench 1 and prevent the tape 2 from returning.

In the case of rectangular paper giants R, the alignment takes place in such a way that the narrow side of the paper giant R faces the support bench 1. 3, the longitudinal sides 4, 104 of the paper giant R are then received between the guide cheeks 55 of the stop 15, 115.

The packaging machine shown has a receiving surface 21 which is positioned at a distance from the support bench 1. The receiving surface 21 has a two-part structure. Here, a support area 21a is designed to be adjustable in height, whereas an adjacent support area 21b is arranged to be stationary. A separating line 61 lies between the support areas 21a, 21b. The support area 21a, which is rectangular in plan, is provided with a plurality of recesses 26 made parallel to one another. The recesses 26 each have a rectangular cross section, the longitudinal axis of the recesses 26 being arranged transversely to the transport direction of the paper giant R, which is indicated by the arrow 54. The height of the support area 21a is adjusted by means of an adjusting device 27 which, for example, can have cranks connected to one another via a driven shaft 28, each of which is connected to the underside of the support area 21a via connecting rods. From Fig. 2 it can be seen that two shafts 28 arranged in parallel are provided, which are driven by belts 29, 30 or chains. Here, the belt 30 is connected to a drive unit, not shown. When they are actuated, the support area 21a is displaced in the direction of the double arrow 56 depending on the drive direction.

Pneumatically actuated pressure rams 31, 32 are fastened to the guides 9, 109 and can be actuated in the direction of the lifting movement of the support area 21a. From Fig. 2 it can be seen that the pressure stamps 31, 32 rest on the top of the paper giant R at a short distance from the side edges. In this way it is achieved that the side areas of the paper giant R are kept rigid during the packaging cycle and are protected against creasing during the application of the paper sheet 102.

Beneath the support area 21a there are provided combs 33, 34 associated with the recesses 26 thereof. The combs 33, 34 arranged in pairs in the recesses 26, the detailed design of which can be seen particularly in FIGS. 2 and 4, have teeth 133, 134 arranged perpendicular to the support region 21a, the dimensions of which are adapted to the cross section of the recesses 26. 1, the teeth 133, 134 are inserted into the recesses 26 when the support region 21a is lowered. The basic bodies of the combs 33, 34 are horizontal aligned guides 35 guided. The guides 35 are aligned parallel to the recesses 26 of the support area 21a and are supported on the bottom of the packaging machine. As can be seen from FIG. 2, the comb 33 can be adjusted in the direction of the double arrow 57 via the driven chain 36. Adjustable connecting elements 37, which connect the comb 33 to the comb 34, guide the comb 34 when the comb 33 is adjusted and enable the combs 33, 34 to be adjusted relative to one another.

The teeth 133 of the comb 33 are straight, while the teeth 134 of the comb 34 have an inverted L profile. Here, the horizontal legs of the teeth 134 run on the front side of the vertical leg of the teeth 133 of the comb 33.

The combs 33, 34, together with their guides 35, can be adjusted in height or with respect to the support region 21a by means of an adjusting device 39. The adjustment device 39 can have guided slides, for example, which can be adjusted in height manually or automatically.

Laterally offset from the height-adjustable support area 21a, the stationary support area 21b is separated by the dividing line 61, as can be seen from FIGS. 2 and 3. In the embodiment shown, the support area 21b has a lattice structure. The lattice structure of the support region 21b is built up from parallel lattice bars 58 which are arranged at a distance from one another and each have a circular cross section. A support rail 59, which has a rectangular base area, is provided adjacent to the support area 21a. The bars 58 and the support rail 59 have the same length as the height-adjustable support area 21a.

4, a brush 24 is arranged above the support rail 59, which is oriented perpendicular to the support rail 59. The brush handle is connected to a drive unit 25 which is fixed to the guide 109. The height of the brush 24 can be adjusted by means of the pneumatically acting drive unit 25, for example. A packing paper sheet 102 lying on the support area 21b can be held with the brush 24.

An adhesive distributor 23 is attached to the guide 209. This has a nozzle via which a narrow adhesive strip can be applied parallel to the edge 5 of the wrapping paper sheet 102.

FIG. 4 shows a slightly modified embodiment, in which the pressure stamp 32 has an L-shaped cross-sectional shape, the horizontal leg being provided with a deflection edge 132. In the lowered position of the pressure stamp 32, the deflection edge 132 projects slightly beyond the long side 4 of the paper giant R. This allows the wrapping paper sheet 102 to be applied in a tensioned form to the top of the paper giant R. Furthermore, the transverse fold impressed on the wrapping paper sheet 102 ensures good or crease-free application of the wrapping paper sheet 102 to the upper edge 62 of the paper giant R. In particular, the paper sheets of the ream R can be prevented from crumpling during the application of the wrapping paper sheet 102.

Two conveyor belts 38, 41 are provided below the support area 21b. The conveyor belts 38, 41 are each aligned horizontally and spaced from each other. The conveyor belts 38, 41, which can be driven in the opposite direction of rotation, receive the paper giant R from the support area 21a. The height of the upper conveyor belt 38 is adjustable with respect to the lower conveyor belt 41. Furthermore, the upper conveyor belt 38 can be displaced in the horizontal direction.

In the embodiments according to FIGS. 1 to 4, the upper conveyor belt 38 is assigned a deflecting rod 40 which is arranged horizontally and has a U-shaped cross section. The deflecting rod 40 arranged at the level of the upper conveyor belt 38 is adjustable in the horizontal direction. As a result, as can be seen particularly from FIG. 4, the wrapping paper sheet 102 can be provided with a transverse fold at the deflection edge 132. This is achieved in that the wrapping paper sheet 102, which is held by the brush 24 on the support area 21b, is pressed against the deflecting edge 132 and deflected thereon. The transverse folding brings about a trouble-free application of the wrapping paper sheet 102 to the front edge area of the paper giant R.

In the embodiment according to FIG. 6, which is otherwise identical to the embodiment according to FIG. 4, no deflecting rod 40 is provided. Here, the transverse folding of the wrapping paper sheet 102 is achieved by moving the upper conveyor belt 38 to the deflecting edge 132 of the pressure stamp 32. One end of the conveyor belt 38 thus replaces the deflecting rod 40.

The lower conveyor belt 41, which has a greater length than the upper conveyor belt 38, is followed by a further conveyor device 43, which leads to a unit, in which the front and rear end area of the envelope is closed.

The process guidance in the above-described embodiments is to be explained below:
First of all, the method step of feeding and measuring a wrapping paper sheet 102 from the wrapping paper tape 2 will be described. This method step is essentially the same in all embodiments and is to be explained in particular with reference to FIGS. 7 and 8.

According to FIGS. 1 and 7, the upper paper giant R is pushed manually or automatically from the lifting table 50 to the stop elements 15, 115 onto the adjacent support bench 1. The front edge of the paper giant R thus abuts the stop elements 15, 115. On the top of the support bench 1, the packaging paper tape 2 coming from the feed device 17 is guided to point B. The rollers 3, 103 shown in FIG. 3 hold the end region of the wrapping paper tape 2 at the top of the support bench 1.

The paper giant R, which is held in the lateral direction by the guide cheeks 55 of the stop elements 15, 115, is positioned in such a way that the long side 4 of the paper giant R is arranged at the level of the dividing line 61 between the bearing region 21a and the bearing region 21b of the bearing surface 21. The long side 4 of the paper giant R is in this position even when the format is changed. The distance D1 between the long side 4 of the paper giant R and the edge 5 of the wrapping paper tape 2 is dimensioned such that the side area of the paper giant R and the top thereof can be covered with wrapping paper. The distance D 2, which exists between the long side 104 and the edge 105 of the wrapping paper, is equal to the height H of the paper giant R extended by about 40 mm.

betragen. Somit überragt der Packpapierbogen 102 sowohl die Vorderkante als auch die Hinterkante des Papierrieses R. Die Länge des Übermaßes des Packpapierbogens 102 ist von der gewählten Verschließart der Packpapierumhüllung abhängig.With the packaging machine, paper giant R with a length L between 530 and 1400 mm and a height H between 12 and 80 mm can be provided with a wrapping paper wrapping. A wrapping paper sheet 102 having a length S is required to encase such a paper giant R. Depending on the wrapping you want, the length may vary $\text{S = L + 2H + 80 mm}$

be. The wrapping paper sheet 102 thus projects beyond both the front edge and the rear edge of the paper giant R. The length of the oversize of the wrapping paper sheet 102 depends on the chosen type of closure of the wrapping paper wrapper.

The grippers 6, 7, 8 arranged on the guides 9, 109, 209 grip the edge region of the paper giant R or the wrapping paper band 2 arranged underneath. As can be seen from FIGS. 2 and 3, the smaller gripper 8 only grips the wrapping paper band 2 or a wrapping paper sheet 102. By feeding the paper giant R together with the wrapping paper sheet 2, the paper giant R is protected during the feeding.

To measure a wrapping paper sheet 102, the feed device 17 is actuated, whereupon the wrapping paper reel 2 is unwound from the wrapping paper reel. The wrapping paper band 2 deflected on the deflection roller 52 lies between the drivable unwinding rollers of the feed device 17. According to the position shown in the extended position, the wrapping paper band 2 in its starting position runs from the feed device 17 via the cutting device 18 to the top of the support bench 1, before being measured and perforated a deflection takes place on the intermediate tensioning roller 19.

ab. Die Lage der Punkte A, B und C, bzw. deren Entfernung voneinander, geht aus Fig. 7 hervor. Der Punkt A kennzeichnet die Position der Schneideinheit 18. Der Punkt B kennzeichnet die Endkante des Packpapierbandes 2 bzw. die Abtrennzone und der Punkt C die durch die Anschlagelemente 15, 115 definierte Lage der Vorderkante des Papierrieses R. Während des Abwickelns der Länge S 1 wird das Packpapierband 2 durch die Spannrolle 19 straff gehalten, die durch ihr Gewicht gegen die Oberseite des Packpapierbandes 102 gedrückt wird. Nachdem die Länge S 1 abgewickelt wurde und sich die Länge S zwischen der Schneideinheit 18 und dem Punkt B befindet, wird die Schneideinheit 18 angesteuert. Hierdurch wird das Packpapierband 2 mit einer quer zu dessen Längsrichtung verlaufenden Querperforation E versehen. Die Querperforation E ist derart beschaffen, daß das Packpapierband 2 auch noch nach dem Aufbringen der Querperforation einer gewissen Zugbeanspruchung aussetzbar ist und somit transportabel bleibt.A wrapping paper sheet 102 can be provided in two ways. In a first variant, the unwinding rolls of the feed device 17 first wind a length $\text{S}$$\text{1 = S - (AC + CB)}$

from. The position of points A, B and C, or their distance from one another, can be seen from FIG. 7. The point A denotes the position of the cutting unit 18. The point B denotes the end edge of the wrapping paper band 2 or the separation zone and the point C denotes the position of the front edge of the paper giant R defined by the stop elements 15, 115. During the unwinding the length S 1 becomes the wrapping paper tape 2 held taut by the tension roller 19, which is pressed by its weight against the top of the wrapping paper tape 102. After the length S 1 has been unwound and the length S is between the cutting unit 18 and the point B, the cutting unit 18 is activated. As a result, the wrapping paper tape 2 is provided with a transverse perforation E extending transversely to its longitudinal direction. The transverse perforation E is such that the wrapping paper tape 2 can still be subjected to a certain tensile stress even after the transverse perforation has been applied and thus remains transportable.

ist. Nach diesem Verfahrensschritt befindet sich das Packpapierband 2 in der in den Fig. 1 und 7 dargestellten strichlinierten Position. Die Querperforation E befindet sich somit noch in Laufrichtung des Packpapierbodens 2 vor der Spannrolle 19. Die Länge S des Packpapierbogens 102 entspricht der Entfernung zwischen dem Punkt E und dem Punkt B. Die Entfernung zwischen den Punkten A und E ist gleich der Entfernung zwischen den Punkten A und B.After the transverse perforation E has been applied, a length S 2 is also unwound by means of the feed device 17, wherein $\text{<figure-callout id="2" label="S" filenames="imgf0001.png,imgf0005.png" state="{{state}}">S</figure-callout> 2 = AC + CB}$

is. After this process step, the packaging paper tape 2 is in the dashed line position shown in FIGS. 1 and 7. The transverse perforation E is thus still in the direction of travel of the wrapping paper base 2 in front of the tensioning roller 19. The length S of the wrapping paper sheet 102 corresponds to the distance between the point E and the point B. The distance between the points A and E is equal to the distance between the points A and B.

The tensioning roller 19 now arranged in its lower position leads the wrapping paper tape 2 past the sensor 22, with which the transverse perforation E can be detected. The exact cutting of the lengths S1, S2 is achieved in that the unwinding rolls of the feed device 17 are designed as measuring rolls and are coupled to a measuring device which is connected to a control for the feeding device.

In the variant of the provision of the wrapping paper sheet 2 according to FIG. 9, the length adjustment of the sheet is carried out by adjusting the cutting device 18. The adjustment is carried out in such a way that the tape length between points A and B is equal to the length S of the wrapping paper sheet 102. This process variant can then be carried out in one pass.

einstellen läßt. Die Spannrolle 19 ist in Papierzuführrichtung vor der Schneideinrichtung 18, jedoch hinter der Zuführeinheit 17 vorgesehen. Der durch sie gebildete "Speicher" wird beim Transport des Rieses R "geleert". Wie bei Fig. 7 erfolgt der Abriß, wenn die Spannrolle ihre obere, ggf. durch eine Einstellschraube 98 bestimmte obere Lage erreicht hat. Die Spannrolle 19 und damit der "Speicher" könnte aber auch, wie bei Fig. 7, hinter der Schneideinrichtung vorgesehen sein. Bei dieser Ausführung sind die das Packpapier vor dem Zurückrutschen bewahrenden, mit einem Freilauf versehenen Rollen 3 noch vor dem horizontalen Teil des Tisches angeordnet.9 corresponds to that of FIG. 7, but with the following differences:
The unwinding and metering rollers of the feed unit 17, the tensioning roller (dancer roller) 19 and the cutting or perforating unit 18 are arranged on a carriage 99 which can be adjusted in the vertical direction, by adjusting the length $\text{S = AB}$

can be adjusted. The tensioning roller 19 is provided in the paper feed direction in front of the cutting device 18, but behind the feed unit 17. The "storage" formed by it is "emptied" when the ream R is transported. As in FIG. 7, the demolition takes place when the tensioning roller has reached its upper position, possibly determined by an adjusting screw 98. The tensioning roller 19 and thus the "memory" could also be provided behind the cutting device, as in FIG. 7. In this version, the wrapping paper is prevented from sliding back, with a Free-running rollers 3 still arranged in front of the horizontal part of the table.

The provision of a suitably measured wrapping paper sheet 102 is carried out continuously during the packaging cycle during operation of the packaging machine. This can increase productivity, since the feeding movement of the wrapping paper sheet 102 or the paper giant R can take place without interruption. To cut off the wrapping paper sheet 102, only the wrapping paper tape 2 has to be stopped, while the wrapping paper sheet 102 can continue its feed movement.

The packaging cycle is described below. Here the paper giant R is provided with a tubular or closed covering. At the end of the packaging cycle, only the front and back of the paper giant R then have to be closed by appropriately folding the wrapper.

At the beginning of the packaging cycle, the paper giant R is in the dashed line position shown in FIGS. 1 and 7. The front of the paper giant R abuts the elements 15, 115 of the stop. The wrapping paper tape 2 provided by the feed device 17 or the wrapping paper sheet 102 cut to length assumes the dashed line position. Accordingly, the tension roller 19 is in its lower position.

When the paper giant R is fed against the stop elements 15, 115, the pliers 6, 7, 8 close. At the same time, their displacement in the direction of arrow 54 is initiated. The grippers 6, 7, 8 are driven by the drive belts 13, 14, which are not shown Drive unit are driven. The synchronously actuated grippers 6, 7, 8 are each guided on their own guides 9, 109, 209. During the displacement of the paper giant R in the direction of the arrow 54, it is transferred together with the wrapping paper sheet 102 from the support bench 1 to the adjacent support surface 21. Here, the height-adjustable support area 21a, which according to FIG. 1 is in its upper position at this time, supports both the paper giant R and the wrapping paper tape 2. The long side 4 of the paper giant R is arranged at the level of the dividing line 61 between the support area 21a and the support area 21b. In contrast, only wrapping paper tape 2 rests on the support area 21b.

During the transfer of the paper giant R to the support surface 21, the tension roller 19 is raised in the vertical direction. Passing the transverse perforation E can be determined by the sensor 22. Before the grippers 6, 7, 8 have finished their displacement movement, the tensioning roller 19 reaches its upper end position, the wrapping paper tape 2 assuming the position shown in solid lines according to FIGS. 1 and 7. By pulling the grippers 6, 7, 8, the wrapping paper tape 2 is subjected to a tensile stress acting in its longitudinal direction. The unwinding rollers of the feed device 17 are blocked after the transverse perforation has exceeded the rollers 3, 103 which hold the wrapping paper tape 2 on the upper side of the support bench 1. This separates the transverse perforation E exactly. The transverse perforation E is separated at point B of the support bench 1. The paper band 2 then again assumes the position shown in solid lines in FIGS. 1 and 7, which represents the starting position. Accordingly, the separation of the transverse perforation E takes place exactly at the point B at which the head of the paper tape 2 was previously positioned.

A particularly precise separation was achieved with a transverse perforation E which had incisions of approximately 50 to 60 mm in length, between which bridges of approximately 1 to 3 mm were provided. Such a transverse perforation E also leads to a sufficiently stable wrapping paper tape 2.

As can be seen from FIG. 8, the wrapping paper sheet 102 projects beyond both the front and the rear edge of the paper giant R, the excess depending on the fold chosen to completely close the wrapper.

During the feed movement of the paper giant R onto the support surface 21, an adhesive strip is applied to the wrapping paper tape 2 or the wrapping paper sheet 102 in the region of its edge 5 by means of the adhesive distributor 23. After the paper giant R and the wrapping paper sheet 102 arranged beneath it lie completely on the support area 21a, as shown in FIG. 1, the grippers 6, 7, 8 open. With a further translational movement in the direction of the arrow 55, the grippers 6 , 7, 8 led away from the paper giant R. Finally, the grippers 6, 7, 8 assume the position of the gripper 6 shown in solid lines in FIG. 1.

At least one of the grippers 6, 7 is expediently provided with a measuring sensor with which the height of the paper giant R can be determined. In the event of irregularities, the packaging machine can thus be stopped.

At the beginning of the wrapping step for the paper giant R, it is in the position shown in FIG. 1, the support region 21a assuming its upper end position. In Fig. 2 is the position of the paper giant R or Wrapping paper 102 drawn in dashed lines at the beginning of the wrapping cycle. The support area 21a can be lowered vertically downwards by the adjusting unit 27. Due to the pressure stamps 31, 32 in the area of the long sides 4, 104, the paper giant R and the packing paper base 102 are held firmly on the support area 21a. As a result, the side areas of the paper giant R can be kept rigid. Thus, wrinkling can be avoided during the application of the wrapping paper sheet 102. 2, the wrapping paper sheet 102 is applied to the long side 4 of the paper giant R while the support area 21a is being lowered. This is stretched out by the brush 24 and held on the support area 21b and withdrawn from it via the support rail 59 and the deflection rod 40.

When the support area 21a is lowered, the teeth 133, 134 of the combs 33, 34 arranged in pairs are inserted into the recesses 26 of the support area 21a. The combs 33, 34 are positioned by means of the adjusting device 39 beforehand at a short distance from the longitudinal side 104 of the paper giant R. Thus, when the support region 21a is lowered, the small portion of the paper sheet 102 projecting laterally is placed against the longitudinal side 104 of the paper giant R. 2). The end region of the wrapping paper sheet 102 then protrudes somewhat in the region of the long side 104 above the top side of the paper giant R.

The teeth 133, 134 first assume the position shown in FIG. 2. The end face of the horizontal leg of the tooth 134 is thus aligned with the outer upper side of the vertical leg of the tooth 133. This extends the effective tooth height.

The following process steps are particularly clear from FIG. 4. The adjustment unit 37 is controlled in such a way that the comb 33 is brought together with the comb 34. Here, the horizontal leg of the teeth 134 places the short edge of the wrapping paper sheet 102, which projects above the top of the paper giant R, on it.

The long edge of the wrapping paper sheet 102 still resting on the support area 21b is then applied to the top of the paper giant in an automatic and rapid sequence of the individual method steps.

At the end of the lowering process of the support area 21a, the pressure stamp 32 is raised somewhat from the top of the paper giant R. The pressure stamp 32 is advantageously a few millimeters, e.g. B. 2 to 3 mm, above the top of the paper giant R. The deflecting edge 132 of the plunger 32 then projects, as shown in FIG. 4, laterally the long side 4 of the paper giant R. The deflecting rod 40 arranged below the support region 21b is thus against the Packing paper sheet 102 performed that it is pressed against the deflecting edge 132. As a result, a transverse fold is applied to the wrapping paper sheet 102 held by the brush 24 on the support rail 59, with which a tension of the front long edge of the wrapping paper sheet is achieved, whereby the application of the wrapping paper sheet on the upper front edge 62 of the ream R is improved. In particular, the ream R is prevented from creasing. Since this makes it unnecessary for the pressure stamp 32 to rest on the top of the paper giant R, the paper giant R can be transported directly under the drive of the teeth of the comb 33.

To apply the wrapping paper sheet 102 to the top of the paper giant R, it is displaced transversely to the feed movement in the direction of the arrow 60, which is achieved by displacing the combs 33, 34.

The conveyor belts 38, 41 arranged below the support area 21b move at the same speed as the combs 33, 34. When the front part of the paper giant R has arrived on the conveyor belt 41, the conveyor belt 38 is lowered onto the top of the paper giant R. The lowered conveyor belt continuously places the wrapping paper sheet 102 on the upper side thereof while the paper giant R is being moved. In the corresponding step, the deflecting rod 40 is withdrawn and the pressure stamp 32 is moved into its upper position. Likewise, the brush 24 is raised so as not to come into contact with the adhesive strip applied to the wrapping paper sheet 102.

5 that the passage of the comb 34 is finished when its teeth 134 have arrived just before the conveyor belt 38. The comb 33 remains active and progressively moves away from the comb 34, finally taking the end position shown in solid line in FIG. 5, which corresponds to the starting position of the combs 33, 34 according to FIG. 2. The upper rear edge of the wrapping paper sheet 102, which is held by the teeth 134 of the comb 34, progressively strips itself off from these teeth 134 and at the same time fits under the front upper edge of the wrapping paper sheet 102 the two edge areas are joined together on the adhesive strip. Finally, the comb 33 also stops, which then returns to the rest position together with the comb 34.

When the paper giant R has completely arrived on the conveyor belt 41, the wrapping paper sheet 102 is completely wrapped around the paper giant R and fastened thereon. The paper giant R is then taken over by the conveying device 43 and fed to a device for closing the end regions of the tubular paper wrapper.

The conveyor belt 38 then returns to its upper position. The support area 21a is also returned upwards. The cycle described above can then be repeated.

In the embodiment according to FIG. 6, in which no deflecting rod 40 is provided, this task is accomplished by the conveyor belt 38 itself. Thus, with the end region of the conveyor belt 38, a pronounced fold is applied to the wrapping paper sheet 102 between it and the deflection edge 132. The pressure of the conveyor belt 38 against the deflection edge 132 can then be reduced, but should be maintained. In this position, the wrapping paper sheet 102 is initially applied to the paper giant R by activating the conveyor belt 38. The conveyor belt 38 is then guided away from the pressure stamp 32 or its deflection edge 132 in order to enable the pressure stamp 32 to be carried away. The further method steps are basically the same as in the above-described embodiments.

During the implementation of the packaging cycle, a corresponding packaging paper sheet 102, as described above, is cut to length at the feed station of the packaging paper tape 2 and made available for a subsequent packaging cycle. Thus, the feeding and wrapping of the paper giant R can be carried out without interruption. The one across a perforation E wrapping paper sheets 102 connected to the wrapping paper band 2 can be separated while the paper giant R is being fed, whereby the grippers 6, 7, 8 can continue their feeding movement.

Claims (13)

Method for forming a closed wrapping around an object (R), in particular around a paper giant, characterized in that the underside of the object (R) is positioned on a spread out sheet of flat material (102), in particular a wrapping paper sheet, in such a way that in the area of the Side surfaces (4, 104) of the object (R) have laterally projecting partial areas of the flat material sheet (102) which essentially correspond to the area to be covered, that the object (R) is lowered and in the process the flat material sheet (102) touches the side surfaces (4, 104) that the sheet material sheet (102) is applied to the top of the item (R) by lateral displacement of the item (R) and that the ends of the sheet material sheet (102) which are brought together are connected to one another. A method according to claim 1, characterized in that when the object (R) is lowered, its side surfaces (4, 104) are stiffened with a compressive force acting on the top of the object (R), and / or when the object (R ) a protruding larger portion of the sheet of flat material (102) is withdrawn from a stationary support area (21b), the larger portion preferably being withdrawn from the stationary support area (21b) against the force of a holding means (24). Method according to Claim 1 or 2, characterized in that the flat material sheet (102) is held taut when it is placed on the top of the object (R) and / or a transverse fold is impressed on it in the region of an upper edge (62) of the object (R) , which is preferably offset in height and / or offset to the upper edge (62) of the object (R) on the flat material sheet (102). Method in particular according to one of the preceding claims, characterized in that a wrapping step for forming a closed wrapper for an object (R) by a flat material sheet (102) is preceded by a feed step for the flat material sheet (102), in which the object (R) is advantageously is fed together with the sheet of flat material (102), the sheet of flat material (102) preferably being connected via a perforation (E) to a sheet of flat material (2) which, when the sheet of sheet material (102) is fed in, in particular by blocking the feed device (17) for the flat material strip (2) is cut off and, if necessary, measuring and perforating of the flat material sheet (102) from the flat material strip (2) during the wrapping step of a previous object (R). Method according to one of the preceding claims, characterized in that during the feeding of the flat material sheet (102) the object (R) is positioned with respect to the flat material sheet (102) and / or at least one protruding partial area of the flat material sheet (102) is provided with an adhesive strip, which is advantageously applied in the area of a peripheral edge (5), the lateral displacement of the object (R) for placing the sheet of flat material (102) on the top of the object (R) preferably perpendicular to the feed movement of the object (R) and, if appropriate, after the Wrapping cycle of the flat material sheet (102) projecting in the area of the front and back is closed. Device for forming a closed envelope around an object (R), in particular for carrying out the method according to one of the preceding claims, characterized in that a two-part bearing surface (21) is provided which has an adjustable bearing region (21a) and a stationary bearing region (21b ) having. Apparatus according to claim 6, characterized in that the support surface (21) is aligned horizontally and a vertically adjustable support area (21a) is provided, which preferably has recesses (26) into which an application means (33, 34) for applying the flat material sheet (102) to the object (R) In particular, each recess (26) is assigned an attachment means which consists of two combs (33, 34) which can be adjusted relative to one another and / or the attachment means (33, 34) in the recesses (26) of the adjustable support area (21a) if necessary Can be moved transversely to the feed direction of the object (R), the application means (33, 34) on the one hand combs (33) with approximately L-shaped teeth (133) and on the other hand combs (34) with an inverted L-shaped teeth (134 ) can have, and preferably form the teeth (133, 134) of the combs (33, 34) a deflection edge for the flat material sheet (102) in a merged position. Apparatus according to claim 7, characterized in that the distance between the application means (33, 34) and the adjustable support area (21a) is adjustable, an adjustment device (39) possibly being provided with which a guide (35) for the application means (33, 34) is adjustable, and / or the adjustable support area (21a) is assigned a pressure means (31, 32) which is preferably designed as a pneumatically actuated pressure stamp (31, 32) and which exerts a compressive force on the side areas of the object (R) , in particular the pressing means (31, 32) being movable perpendicular to the adjustable support area (21a) and preferably being arranged on guides (9, 109, 209) for grippers (6, 7, 8) and / or with a deflection means (132) is designed to apply a transverse fold to the flat material sheet (102), which preferably has a deflection edge (132), and possibly above and / or laterally offset from the upper edge (62) of the object ( R) can be positioned, a deflecting rod (40) preferably being associated with the deflecting means (132) which is arranged adjustable with respect to the deflection means (132) or the deflection means (132) interacts with an adjustably arranged transport means (38), in particular a conveyor belt (38), for the object (R). Device according to one of claims 6 to 8, characterized in that the stationary support area (21b) has a lattice structure which preferably has a support rail (59) for the flat material sheet (102) assigned to the adjustable support area (21a) and / or the stationary support area (21b), in particular its support rail (59), has a holding means (24) for the sheet of flat material (102) lying on it, which is preferably designed to be movable with respect to the stationary support area (21b), a transport means possibly below the stationary support area (21b) (38, 41) is provided for taking over the object (R) coming from the adjustable support area (21b), which can have two spaced conveyor belts (38, 41), one of the conveyor belts (38) advantageously being adjustable in height to the other conveyor belt (41) is formed, of which the upper conveyor belt (38) is preferably adjustable in the horizontal direction and The deflecting means (132) for the flat material sheet (102) can advantageously be delivered. Device according to one of the preceding claims, characterized in that a feed means for feeding the flat material sheet (102) and the object (R) is provided, which preferably has grippers (6, 7, 8), each having controllable gripping arms and possibly vertically for moving the object (R) is movable in the wrapping device and is guided in particular on guides (9, 109, 209) which are arranged above the bearing surface (21), it being possible for the external guides (9, 209) to be adjustable in the lateral direction. Apparatus according to claim 10, characterized in that the feed means is designed such that the object (R) is guided with its long side (4, 104) to a dividing line (61) present between the support areas (21a, 21b) and / or that Feed means is arranged on hollow profile supports in which drive means (13) driving the feed means are arranged. Device according to one of the preceding claims, characterized in that the support surface (21) is adjacent to a support bench (1) which is associated with an adjustable stop (15, 115) for the object (R), which preferably has lateral guides (55) for Positioning of the item (R) has. Device according to one of the preceding claims, characterized in that a distributor (23) is provided for applying an adhesive strip.

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