EP0514334A1 - Compression apparatus in wrapping machines for making tubular packages from printed products - Google Patents

Abstract

The compression apparatus for winding machines for winding printed products fed in an imbricated formation contains at least two compression belts (5.1, 5.2), which together enclose a sector of the circumference of the roll of at least 270 DEG . An even and powerful pressure, which in one particular embodiment is controllable, is thereby exerted on the roll. The belts (5.1, 5.2) can be fully ventilated by means of movement groups (3, 6, 8, 17.1, 17.2, 21.1, 21.2), following which a complete roll can be simply discharged. <IMAGE>

Description

The invention lies in the field of printing machines and relates to a pressing device for winding machines for producing tubular packages from printed products, such as newspapers, magazines and the like, which are wound into a roll and fed in a shingled formation, according to the preamble of patent claim 1.

Various winding machines are known which wind printed products into a roll and hold them together in this wound-up arrangement by means of a holding element. Tapes, cords, foils and so on are used as holding elements. In order to wind up the printed products in a roll or tube shape and to attach the holding element simultaneously or in a subsequent work step, guide or pressing devices are required which initiate and support the winding process. A generic device is known from European Patent Specification No. 0 313 781, which also makes it possible to use holding elements with low rigidity. A plastic film becomes from a supply roll unwound and brought under tension against a supplied shingled stream of printed products. The film and a section of printed products are fed to a take-up point via a separate or common feed and are wound there together around a winding mandrel and, after the take-up has ended, the sheet is separated off at the desired point. The winding takes place on the one hand by the freely rotatable winding mandrel, on the other hand by an endless belt which drives the mandrel with the printed products and at the same time exerts a certain pressure on the printed products in the radial direction.

At the beginning of the winding process, when the endless belt is in contact with a substantial part of the periphery of the winding mandrel or the wound printed products, a relatively good contact pressure is achieved. However, the more printed products that are wound, the smaller the sector covered by the belt. Shortly before the end of the winding process, the periphery of the winding is hardly covered by the belt over a sector of 180 °. The winding process can thereby be adversely affected, in particular during the final phase of the winding. The desired strength of the winding suffers and a controlled pressing of the printed products and the holding element holding them together is no longer guaranteed. A further disadvantage of this and other known devices lies in the time-consuming and mechanically complex ejection process of a finished printed product roll.

The above-mentioned disadvantages and problems become even more serious if the compact winds emerging in recent times, as are known, for example, from CH patent application No. 02 796 / 90-7, are to be wound, ie windings which are formed from a densely compressed stream of flakes . The radial forces acting there, but also that Initiation of the winding process, ie the deflection of the shingled stream during winding, can only be solved inadequately with conventional devices.

It is therefore an object of the invention to provide a pressing device which ensures a pressing and holding effect covering a large part of the winding periphery during the entire winding process and which enables the production of precisely wound, compact tubular packs of high rigidity and a simple and quick removal of the finished printed product rolls enables.

This object is achieved by the features mentioned in the characterizing part of patent claim 1.

• Figur 1 zeigt eine erste, beispielhafte Ausführungsform der erfindungsgemässen Anpresseinrichtung zu Beginn des Wickelvorgangs bei noch leerem Wickeldorn;
• Figur 2 zeigt die Anpresseinrichtung gemäss Figur 1 kurz vor Abschluss des Wickelvorgangs mit einem fast vollen Druckproduktewickel;
• Figur 3 zeigt die Anpresseinrichtung gemäss Figur 1 nach Abschluss des Wickelvorgangs vor dem Ausstossen des vollen Wickels.
• Figuren 4 bis 6 zeigen eine zweite, beispielhafte Ausführungsform der erfindungsgemässen Anpresseinrichtung in den den Figuren 1 bis 3 entsprechenden Stadien des Wickelvorganges.
• Figur 7 zeigt ein Ablaufschema des Wickelvorganges und des Wickelwechsels für die Anpresseinrichtung gemäss Figuren 4 bis 6.

Two exemplary embodiments of the invention are to be explained in more detail with reference to the following figures.

• FIG. 1 shows a first exemplary embodiment of the pressing device according to the invention at the start of the winding process with the winding mandrel still empty;
• FIG. 2 shows the pressing device according to FIG. 1 shortly before the end of the winding process with an almost full printed product roll;
• FIG. 3 shows the pressing device according to FIG. 1 after the winding process has ended before the full winding is ejected.
• Figures 4 to 6 show a second exemplary embodiment of the pressing device according to the invention in the stages of the winding process corresponding to Figures 1 to 3.
• FIG. 7 shows a flow diagram of the winding process and the winding change for the pressing device according to FIGS. 4 to 6.

The present invention is particularly concerned with the manner of pressing, holding and guiding the printed products during the winding process. The embodiments of the pressing device described with reference to the figures can be used together with different types of winding machines, but are particularly suitable for use together with a winding machine according to European Patent No. 0 313 781.

In Figure 1 , a first embodiment of the pressing and holding device is shown at the beginning of the winding process. The structure and the mode of operation of the printed product and holding element feed, the drive, etc. corresponds to the above-mentioned device as it is shown and described in detail in European Patent No. 0 313 781 by the same applicant. For this reason, explanations are only given below of the overall device to the extent that this is necessary for understanding the device according to the invention.

The essence of the invention is characterized by a fundamental change in functionality of the conventional auxiliary elements which support the winding process. In those devices, these elements were primarily understood as auxiliary devices for supporting the winding . That means these auxiliary facilities initiated the redirection and rewinding of the linear print product flow and at the same time still served a function as a pressing means . The present invention is based on the fact that for the production of compact printed product rolls with high strength, a device is used which has an effective pressing and holding function , that is to say which covers a large part of the winding periphery , and at the same time, as a secondary function, supports the initiation of winding . In other words, an effective pressing device is created, whereas conventional constructions were based on a mere auxiliary device for the winding process.

A winding mandrel 1, which is used to wind up the printed products, is suspended and supported in a conventional manner in a frame 2, not shown here, in a freely rotatable manner. A belt conveyor 3 is also pivotally attached to the frame 2 about an axis 4. Three possible pivot positions 3 ', 3˝ and 3˝' of the belt conveyor 3 are shown, the position 3 'when the winding is still empty, the other two positions 3˝ and 3˝' are shown in broken lines. The idea of the invention is now based on holding or compressing the winding as far as possible along its entire periphery, ie over an optimal sector of 360 °, and thereby exerting a contact pressure which is as uniform as possible in the radial direction against the winding mandrel 1. For this purpose, at least two pressure belts 5.1 and 5.2 are provided according to the invention, which wrap around the winding periphery over a sector of at least 270 ° with a view to the optimal wrapping sector. Both belts 5.1, 5.2 are endless belts or belts, which are arranged in the region of the winding mandrel and are guided over a plurality of deflection rollers, so that they each over the winding mandrel 1 or during the winding process the printed product winding 7 (indicated by a dash-dotted line) Part of their periphery. The first pressure belt 5.1 wraps around the empty one at the start of the winding process Winding mandrel 1 along its periphery over a sector α, which in the present exemplary embodiment is approximately 140 °. The second belt 5.2, in turn, ensures a pressure on a second sector β of approximately 160 ° to 180 °. Since these sectors α, β partially overlap in the present exemplary embodiment, an open sector of approximately 50 ° to 60 ° remains, the periphery of which is not detected by the pressing device. If an even more complete wrap (against 360 °) is to be achieved, a third pressure belt can be used. The printed products are fed in via the open sector, ie in this exemplary embodiment via the belt conveyor 3 (here from right to left).

This circulation of the winding mandrel is achieved by the two belts 5.1, 5.2 are arranged such that at the beginning of the winding process a section of the first belt 5.1 by means of a swivel arm 6 (in its swivel position 6 'when the winding is empty, which is shown in solid lines), its free End approximately forms the point of contact to the periphery of the mandrel 1, is guided to the mandrel and the periphery of which rests over a sector of at least 130 °, preferably 140 °, and the second belt 5.2 is guided in a U-shaped loop around the mandrel 1 and the periphery of which lies over a sector of at least 160 °, preferably 170 °, the two sectors overlapping by a maximum of 15 °, preferably only 10 °.

Since the geometry of the winding changes permanently during the winding process, it is important that, particularly at the end of the winding process, the above-mentioned contact pressure is as good as possible, ie has the smallest possible open sector, and takes place evenly. An advantage of the device according to the invention is that even coils with irregularities are optimally held and pressed along their periphery will. This is especially the case with the above-mentioned compact windings, since these have an approximately circular cross-section.

The course of the first pressure belt 5.1 will now be described in more detail, this being followed in the winding direction (ie counterclockwise in the figure) and starting from the winding mandrel. Immediately at the winding mandrel, the belt 5.1 is guided around a small deflection roller 10.1 (or a static deflection with a small radius of curvature), which in turn is attached to a free end of the swivel arm 6. The swivel arm 6 is in three possible swivel positions 6 ', 6˝ and 6˝', the position 6 'being extended when the reel is empty, the other two positions are shown in dash-dotted lines. This swivel arm, which is rotatable about an axis 11, has a length which corresponds approximately to the diameter of the largest roll of printed products to be wound. It is arranged so that it runs tangentially to the mandrel 1 at its inner end position 6 'and its free end forms approximately the point of contact with the mandrel periphery. During the winding process, the free end moves radially outwards at the same time as the winding radius increases. In an intermediate position 6˝, when the reel is full, the swivel arm or the pressure belt guided around the deflecting roller 10.1 at the free end is again tangent to the full reel. The pressure belt is guided on this swivel arm by a second small roller 10.2. The radius of the small roller 10.1, preferably also that of the deflecting roller 10.2 on the swivel arm 6, is preferably less than 0.5 cm. This allows small dimensions of the swivel arm 6 and thus, despite the limited space, a tight fit of the free end of the swivel arm 6 and thus of the tape on the winding 7. Another deflection roller 12, the axis of which coincides with the swivel arm axis 11, has a larger diameter than the rollers 10.1, 10.2, and further deflection rollers 13 and 14 serve to deflect and guide the belt 5.1 to the drive roller 15. The drive of this roller takes place in a conventional manner via a here Not shown drive (electric motor). The belt is guided via four further deflection rollers 16.1-16.4 to a specifically arranged deflection roller 17.1. This deflecting roller 17.1 is located in an area 20.1, which lies with respect to the winding mandrel 1 relative to the swivel arm 6 or the small deflecting roller 10.1. Thanks to the arrangement of this deflecting roller 17.1 and the small deflecting roller 10.1, the pressure belt 5.1 rests on the swivel arm 6 via the sector α mentioned above the winding mandrel 1. The endless belt 5.1 is held under tension. The belt length or guide is chosen so that the change in length required by the increase in the winding diameter is compensated for by a compensating movement of the deflection roller 16.1, the two belts 5.1, 5.2 in the direction of the two arrows A₁, A₂. This compensatory movement can be done by spring force or a drive in the direction of arrows A₁, A₂. Depending on requirements, this compensating movement of the deflection roller 16.1 can be controlled during the winding process, and consequently the contact pressure of the belts 5.1, 5.2 can be influenced as a function of time or according to other predefinable parameters, which can be used for additional stabilization of the winding. The mutual arrangement of the drive roller 15 and the compensating deflection roller 16.1 provided here is particularly advantageous. The deflection roller 16.1 is connected downstream of the drive roller 15 in the drive or winding direction (ie it lies in the lost drum). If an extension of the belt is now required due to the change in size of the winding during the winding process, this extension can be effected by a compensating movement in the direction of arrow A 1 without the belt having to be pulled off the drive roller, ie there is no grinding or slipping of the Belt on the drive roller.

The course of the second pressure belt 5.2 is also described in the winding direction (counterclockwise). Starting from the winding gate 1, the belt 5.2 is first passed around a first deflection roller 21.1 and then via a second deflection roller 22 to the drive roller 15, which drives the first belt 5.1 at the same time. The pulleys 16.1-16.3 are also used to guide both belts 5.1 and 5.2. It is easy to see that for this reason both the drive roller and the shared deflection rollers must have a sufficient width so that both belts can be guided next to each other . In other words, the belts are offset in the direction perpendicular to the plane of the drawing. This is also necessary because the contact pressure on the winding 7 can partially overlap. Subsequently, the second winding belt 5.2 is guided over two further deflection rollers 23.1, 23.2 below or around the belt conveyor 3, so that the belt conveyor does not disturb the belt course even in its outer end position 3 "". Finally, the belt 5.2 is over a deflection roller 24, the Axis coincides with the axis 4 of the belt conveyor 3, and is also guided via three smaller deflection rollers 25.1-25.3 in the belt conveyor itself back to the winding mandrel 1. The first deflection roller 21.1 for the second pressure belt 5.2 is arranged in such a way that that of the belt conveyor or its small deflection rollers 25 1-25.3 coming belts 5.2 forms a U-shaped loop around the winding mandrel 1 and thus bears over the mentioned sector β of almost 180 ° and develops its contact pressure.

In order to maintain the loop during the winding process when the winding mandrel is empty or even to improve the contact pressure area (sectors α and β), the arrangement of the pivotable belt conveyor 3 and the pivot arm 6 must be coordinated with one another and with respect to the winding mandrel 1. A favorable arrangement is easy to see from the figure: The angle enclosed by the swivel arm 6 and the belt conveyor 3 when resting on the empty winding core (swivel positions 3 'or 6') is between 30 ° and 45 ° and is approx . 40 ° and that The ratio of the distance between the two axes of rotation 4 and 11 to the mandrel axis is approximately 1.3 to 1.4.

The deflection roller 17.1 for the first pressure belt 5.1 and the deflection roller 21.1 each have a corresponding roller 17.2 and 21.2 assigned to them, with which they each form a functional pair . These two pairs 17.1, 17.2 and 21.1, 21.2 can be moved by means of a conveyor chain 8 along a link or rail, not shown here, or by a stable chain guide. This movement path makes it possible to lift the pressure belts for ejecting the full printed product roll from their pressure position and thus to release the roll. The exact functioning of these deflection roller pairs 17.1, 17.2 and 21.1, 21.2 will be explained in more detail with reference to FIG. 3.

FIG. 2 now shows the same arrangement, however, shortly before the winding process is completed, ie when the print product roll 7 is almost full. With the exception of the rollers mounted on the swivel arm 6 and on the belt conveyor 3, all other deflection rollers are in the same position as at the start of the winding process. The swivel arm 6 has been pivoted outwards due to the radial increase in the print product roll and is now in its intermediate position 6˝, which is shown in the extended position. The belt conveyor 3 was also pivoted outwards into the position 3˝, which is also shown in an extended position. The present invention makes it possible to arrange the winding mandrel 1 in a fixed manner with respect to the frame 2 by pivoting the belt conveyor 3 away, ie it is not necessary, as in conventional devices, for the winding mandrel to be fastened, for example, to a pivotable support arm. On the one hand, this allows the mechanics to be simplified, since the position of the generally heavy printed product roll is not changed must, on the other hand, a higher processing speed and easier manipulation can be achieved.

As can be seen from FIG. 2, the two belts 5.1, 5.2 wrap the full printed product roll over almost the entire circumference, with the exception of an open sector of approximately 40 ° in the lower right area of the roll. It can also be seen that the first belt 5.1 now covers the periphery over a sector α₁ of almost 180 ° and the second belt 5.2 a sector β₁ of approximately 210 °. Since almost the entire circumference of the printed product roll 7 is thus captured by the pressing device, a very high tension can also be exerted by the pressing belt as required, without the printed product roll being deformed asymmetrically during the winding process or without adversely affecting the rotational behavior of the roll. Another advantage of the present exemplary embodiment is that an area 19 of the printed product roll, which is pressed on by both pressure belts 5.1, 5.2 at the same time and which therefore exerts a greater pressure in the direction of arrow F compared to other peripheral areas, lies opposite the belt conveyor 3 (related to the mandrel 1).

The removal of a filled printed product roll 7 is now illustrated with reference to FIG. 3 . A filled roll is removed or ejected with the pressure belts released, ie there is a free space between the belts 5.1, 5.2 and the roll 7. In order to release the pressure belts 5.1, 5.2, the deflection roller pairs 17.1, 17.2 and 21.1, 21.2 (see FIGS. 1 and 2) are displaced (starting from the situation shown in FIG. 2) along their path of movement, specifically from the one in FIGS 2 shown position (labeled 'in Figure 3) in a ventilation position (labeled ˝'). This leads to the position shown in FIG Pressure belt 5.1, 5.2. The full winding 7 remains unchanged in its position. The present invention enables complete and rapid ventilation of the pressure belts, as will be explained in detail below. There are essentially four movement elements or movement groups in ventilation. These are the swiveling belt conveyor 3, the swivel arm 6 and the two pairs of guide rollers 17.1, 17.2 and 21.1, 21.2. These four movement groups are moved essentially simultaneously or in quick succession from their pressing position (see FIG. 2) to the release position (FIG. 3). Since the parts to be moved are relatively light parts (that is, above all, the printed product roll does not have to be moved), this process can take place relatively quickly. The belt conveyor 3 is pivoted about its axis of rotation 4 and brought into its release position 3˝ '(shown in solid lines) and is thereby spaced from the printed product roll. Similarly, the swivel arm 6 is pivoted into its outermost position 6 Stellung '(shown in solid lines) and thus also spaced apart from the printed product roll. As can easily be seen from FIG. 2, however, simply swiveling these two units away would not be sufficient to cancel the previously caused looping of the periphery of the winding. Rather, the two pairs of guide rollers 17.1, 17.2 and 21.1, 21.2 are pivoted from their original position (17.1 ', 17.2', 21.1 ', 21.2', dash-dotted lines) by means of the conveyor chain 8, along a predetermined movement path (movement backdrop or stable chain guide) that they come into a new position (17.1˝ ′, 17.2˝ ′, 21.1˝ ′, 21.2˝ ′, shown in solid lines). It is easy to see that the deflecting roller pairs essentially follow the course of the conveyor chain 8 to which they are connected, as indicated by a dash-dotted line. The deflection rollers 17.1, 17.2 (in reverse operation) move on the outer chain track and the deflection rollers 21.1, 21.2 accordingly on the inner chain track. The course of this revolving conveyor chain 8 is predetermined by means of deflecting rollers 9.1-9.4 and has a U-shaped course, this U being opened to such an extent that the deflecting roller pairs 17.1, 17.2 and 21.1, 21.2 can be guided with free space around a roll of printed products. As can be seen from FIGS. 1 to 3, only one of the two rollers 17.1, 17.2 or the rollers 21.1, 21.2 is active in each case, that is to say it guides a pressure belt. In the pressing position it is the two deflection rollers 17.1 and 21.1 which are active, in the release position according to FIG. 3 it is the two rollers 17.2 and 21.2. The deflection roller pairs 17.1, 17.2 and 21.1, 21.2 are accordingly moved alternately in two positions, namely on the one hand the pressing position (denoted by ', dash-dotted) and on the other hand the release position (denoted by', extended). These two positions are opposite one another with respect to the winding mandrel 1. The conveyor lette 8 is guided in the respective areas around a deflection or drive roller 18.1, 18.2. The conveyor chain is driven on both sides by a drive, not shown here, for example an electric motor. The movement of the swivel arm 6 and of the belt conveyor 3 is preferably also effected via the same drive, so that a coordinated movement is created between these movement groups. Simultaneously with the movement of these parts into their release position, the length of the belts 5.1, 5.2 is adjusted by means of the deflection roller 16.1, or their tension is reduced. Of course, the end of the holding element must be attached to the winding before or at the same time as it is being released, so that the printed product winding maintains its structure after it has been released. The actual ejection of the full roll finally takes place in a conventional manner, for example with an ejection plate as is known from European Patent No. 0 313 781.

The straps 5.1, 5.2 are preferably made of a slightly elastic plastic. Of course, belts or other circumferential belt materials can also be used as elements equivalent to the belts. In a special embodiment of the invention, belts with structured surfaces, for example transverse grooves, are used. If necessary, you can the belts also have different structures, for example the belt at the inlet with a surface structure and the other belt smooth.

FIGS. 4 to 6 show a second, exemplary embodiment of the pressing and holding device according to the invention, specifically at the start of the winding process (FIG. 4), that is to say when the winding is still empty, when the winding is full or almost full (FIG. 5) and after the pressing has been removed. and retaining elements from the wrap (Figure 6), so in the released state. Different parts of the device are moved during the winding process and for airing and thus assume different positions in the three figures. These are denoted with 'when the wrap is empty (Figure 4), with bei when the winder is full (Figure 5) and ˝' in the released state (Figure 6) and shown in solid lines in the corresponding figures. In each figure, a position of the moving parts, which corresponds to another figure, is also shown in dash-dotted lines to illustrate the movement.

The embodiment of the device according to the invention shown in FIGS. 4 to 6 is based on the same principle as the embodiment shown in FIGS. 1 to 3, that is to say on the pressing and holding of the printed products during winding by means of two pressure belts over the largest possible sector. Different parts of the device have the same function and essentially the same shape and position in both embodiments and are therefore designated by the same reference numerals. These are in particular: the winding mandrel 1, the frame 2, the belt conveyor 3 which can be pivoted about the pivot axis 4 with pivoting positions 3 ', 3˝ and 3˝', the two pressure belts 5.1 and 5.2, the pivoting arm 6 which can be pivoted about the pivot axis 11 with pivoting positions 6 ', 6˝ and 6˝' and the two small deflection rollers 10.1 and 10.2 arranged thereon, the printed product roll 7, the deflection roller 12 arranged coaxially with the pivot axis 11, the Deflection rollers 13 and 14, the drive roller 15, the deflection rollers 16.1, 16.2 and 16.3, and the two wrap angles α and β.

The difference between the two embodiments lies above all in the embodiment of those parts which serve to release the pressure belts 5.1 and 5.2 before the winding change and the winding change itself. The winding change takes place with the embodiment shown in Figures 1 to 3 in four successive steps: First, the pressure belts are released by moving different pulleys with the help of the chain drive from one side of the winding to the other side, then the finished one The reel is ejected with the help of an ejection plate, then the ejection plate is moved back, then the deflection rollers are moved back. After completing the four steps, the winding station is ready for winding again. The winding change in the embodiment represented by FIGS. 4 to 6 also takes place in four steps: First, the pressure belts are released by moving different deflection rollers with the aid of levers on which they are arranged, from one side to the other side of the winding , then the reel is ejected with the help of an ejection plate, then the deflection rollers are moved back. After completing these three steps, the winding station is ready for winding again. The ejection plate can be moved back during the winding process. Since the displacement of the deflection rollers by means of levers is faster than that with a chain hoist and, above all, because the ejection plate is moved back during the winding process, an even faster winding change is possible with the second embodiment (FIGS. 4 to 6). The sequence of the entire winding process with the winding change is described in detail with reference to FIG. 7.

FIG. 4 shows this second exemplary embodiment of the device according to the invention with an empty winding, that is to say shortly before the actual winding process. The parts of the device which move during winding due to the changing radius of the growing reel are also shown in dash-dotted lines for a larger or finished reel, while the pressure belts 5.1 and 5.2 are only shown for the state when the reel is empty.

The course of the first pressure belt 5.1 in the winding direction (counterclockwise in the figure) is the following: The first pressure belt 5.1 runs around the two small deflection rollers 10.1 and 10.2, which are arranged on the swivel arm 6, away from the winding mandrel. The pivot arm 6 has the pivot position 6 'when the winding mandrel is empty, that is to say it is tangential to the winding mandrel 1. From the deflection roller 10.2, the first pressure belt runs onto the deflection roller 12, which is arranged coaxially with the pivot axis 11 of the pivot arm 6, and via two further deflection rollers 13 and 14 to the drive roller 15 and from there via three further deflection rollers 16.1, 16.2 and 16.3, the roller 16.1 being displaceable such that the different belt lengths required by the different winding diameters can be compensated for by their position. The first pressure belt 5.1 runs from the deflection roller 16.3 back to the winding mandrel via a further deflection roller 41.

The course of the second pressure belt 5.2 in the same direction is the following: The second pressure belt 5.2 runs away from the winding mandrel together with the first pressure belt 5.1 via the deflection rollers 13 and 14 to the drive roller 15 and from there via the deflection rollers 16.1, 16.2 and 16.3. From the deflection roller 16.3 it runs back over three further deflection rollers 42, 43 and 44 to the winding mandrel 1. The deflection roller 42 is coaxial with the pivot axis 45 of a second swivel arm 46, the deflection rollers 43 and 44 on this second swivel arm 46 arranged. The second swivel arm 46 performs the same function for the second pressure belt 5.2 as the swivel arm 6 for the first pressure belt 5.1, namely that of adapting the course of the belt to the growing reel and pressing it against the reel. For this reason, the swivel arm 46 assumes different swivel positions, namely position 46 'when the reel is empty, 46˝ when the reel is larger or full. The swivel arm 46 is part of a lever system which also serves the ventilation process and which will be described in detail in connection with FIG. 6. The second pressure belt 5.2 runs back from the deflection roller 44 to the winding mandrel.

In this second embodiment, too, the two pressure belts 5.1 and 5.2 wrap around the winding mandrel 1 with wrap angles α and β, respectively, where α is approximately 140 °, β approximately 160 °, so that the open sector for the introduction of the printed products is also approximately 60 ° here . The two sectors advantageously overlap slightly. Since the overlap grows during winding, it is not absolutely necessary that the two sectors overlap when the winding is empty. Even a short piece of the mandrel circumference can remain unwrapped as long as the length of this piece does not exceed the length of the printed products to be wound.

Furthermore, FIG. 4 shows an ejection plate 50 which is operatively connected via a plate lever 51 to a drive 52, which is only shown schematically, in such a way that the ejection plate 50 can be pivoted on the one hand in the paper plane of the figure according to arrow P from a position 50 'to a position 50˝ , on the other hand perpendicular to the paper plane, parallel to the axis of the winding mandrel 1, is displaceable. It can be seen from the figure that when the reel is empty (extended positions of the moving parts), the ejection plate 50 can be moved perpendicular to the paper plane of the figure without being moved by another Part of the facility to be disturbed. This is obviously still possible if the winding already has a limited diameter, ie if the moving parts (3, 6 and 46) have already moved towards their position marked with ˝.

FIG. 5 now shows the same embodiment of the device according to the invention as FIG. 4 with a full or almost full printed product roll 7. Compared to FIG. 4, in this figure the belt conveyor 3, the swivel arm 6 and the second one have, corresponding to the increased radius of the roll 7 compared to the empty roll Swivel arm 46 other swivel positions (3˝, 6˝ and 46˝). The corresponding positions (3 ', 6' and 46 ') for the empty winding are shown in dash-dotted lines. The displaceable deflection roller 16.1 also has a different position. The course of the two pressure belts 5.1 and 5.2 over the different deflection rollers, which is only shown for the extended positions of the moving parts (3, 6 and 46), is due to the changed positions of the deflection rollers 10.1, 10.2, 16.1, 43 and 44 changed compared to Figure 4. The new wrap angles α ′ and β ′ are now approx. 180 ° and approx. 190 °, where they overlap and leave a sector of approx. 40 ° open.

The ejection plate 50 has a changed position 50˝ compared to Figure 4 (50 '). It is now on the side of the winding 7, so that the winding is ejected when the ejection plate 50 is moved away from the viewer perpendicular to the paper plane in the figure with the aid of the drive 52, which is of course only possible when the belts are released.

FIG. 6 illustrates the ejection of a full roll of printed products 7 and the ventilation of the pressure belts necessary for this. The for that Airing and ejecting moving parts are extended in their new positions compared to Figures 4 and 5 and denoted by ˝ ', dash-dotted in the position before airing (with full print product roll) and again shown with ˝. The two pressure belts 5.1 and 5.2 are only shown in their released position.

In the released position, the belt conveyor 3 and the swivel arm 6 are pivoted away from the reel (positions 3˝ 'and 6˝'). The deflection rollers 41, 42, 43 and 44 are shifted relative to their winding position (FIGS. 4 and 5) in such a way that the pressure belts no longer come into contact with the winding 7. The displacement of the deflection rollers 41, 42, 43 and 44 is realized by a pivoting movement of a ventilation lever 60, on which the deflection rollers 41 and 42 cannot be displaced relative to the ventilation lever 60, the second pivot arm 46 and thus the deflection rollers 43 and 44 are arranged pivotably. The ventilation lever 60, which is not shown in Figures 4 and 5, has an unchanged position 60 '(dash-dotted) during the winding process. It is arranged to the side of the winding 7 (raised from the paper plane against the viewer in the figure) so that it does not come into conflict with the growing winding. During the winding process, as already described, only the pivot position of the second swivel arm 46 changes. For the ventilation process, the ventilation lever 60 is now pivoted from its winding position 60 'into its ventilation position 60''and, for example, with a corresponding link (not shown) for it worried that the second pivot arm 46 changes its pivot position relative to the ventilation lever 60 such that it is pivoted from a pivot position 46stellung in a pivot position 46˝ '. It can be seen from the figure that the movement of the second swivel arm 46 necessary for the ventilation of the pressure belts must take place before or at least simultaneously with the pivoting of the ventilation lever 60, because only in this way is it possible to move the second Swivel arm 46 and the pressure rollers 43 and 44 to move around the winding.

By pivoting the ventilation lever 60 for ventilation, all parts of the pressing device required for the pressing function are removed from the area of the drive 52 and the plate lever 51, whereby these are free for an ejection movement parallel to the winding axis, that is to say perpendicular to the paper plane of the figure , away from the viewer. As soon as the ejection plate 50 has pushed the winding out of the area of the pressure belts, these can be brought back into the winding position (FIG. 4) by pivoting back the ventilation lever 60, the second pivot arm 46 and the pivot arm 6. When the belt conveyor has also returned to the winding position, a new winding process can begin.

During a first phase of the winding process, the ejection plate 50 is first brought into its swivel position corresponding to the position 50 ', then moved parallel to the winding axis and then brought into the ejection spout 50' by swiveling again.

FIG. 7 shows the timing of the movements necessary for a complete winding cycle W of an exemplary application for the embodiment of the device according to the invention according to FIGS. 4 to 6.

The horizontal of the diagram is divided into steps of 0.2 seconds, the individual steps of the winding cycle (winding and winding change) are indicated one below the other. The duration of the individual steps is marked with horizontal bars. The winding change is carried out by first simultaneous release of the pressure belts and swiveling up the ejection plate, second ejection of the winding and third simultaneous closing of the pressure belts and swiveling the ejection plate. With the device described, it is possible to carry out the winding change in less than two seconds. The ejection plate is retracted during the winding. According to the above description, the swiveling and swiveling of the ejection plate can also be carried out during the winding. However, since the winding can only be moved when the belts are completely released, so to speak, and since the swiveling of the ejection plate takes less time for this embodiment than the lifting, swiveling the ejection plate during the winding cannot be shortened.

For the length of an effective winding cycle, application-dependent winding is decisive, on the one hand, and device-dependent ventilation and ejection. These three steps determine the time required for an entire winding cycle.

The movements of the belt conveyor 3, the swivel arm 6 and the ventilation lever 60 necessary for the release of the pressure belts can be generated, for example, with three different, appropriately controlled drives or with a single drive.

Claims (18)

Pressing device for winding machines for the production of tubular packages of packages of printed products such as newspapers, magazines and the like wound up in a roll and a holding element running around the roll with a feed and a winding point with a stationary winding mandrel (1) for the printed products, characterized in that that in the area of the winding point at least two revolving belts (5.1, 5.2) wrap around the periphery of a printed product roll (7) during the entire winding process over a sector of at least 270 °. Pressing device for winding machines according to claim 1, characterized in that two belts (5.1, 5.2) are arranged such that at the beginning of the winding process a section of the first belt (5.1) by means of a swivel arm (6) which can be rotated about an axis (4) free end forms approximately the point of contact to the periphery of the winding mandrel (1), is directed to the winding mandrel (1) and lies against the periphery of the winding mandrel over a sector (α) of at least 130 ° and that a second belt (5.2) in a U-shaped Loop is guided around the winding mandrel and its periphery lies over a sector (β) of at least 160 °, the two sectors overlapping by a maximum of 15 °. Pressing device according to claim 1 or 2, characterized in that the overlap area (19) of the sectors (α, β) with respect to the winding mandrel (1) lies opposite the belt conveyor (3). Pressing device according to one of Claims 1 to 3, characterized in that a belt conveyor (3) which can be pivoted about an axis (11) and which feeds the printed products is arranged with respect to the swivel arm (6) in such a way that when the empty winding mandrel (1) is in contact this an angle of 30 ° to 45 ° is included and the ratio of the distance between the axes of rotation (4, 11) to the axis of the mandrel (1) is 1.3 to 1.4. Pressing device according to one of claims 2 to 4, characterized in that the swivel arm (6) for the first belt (5.1) contains at least at its free end a small deflection roller (10.1) which has a radius of less than 0.5 cm. Pressing device according to one of claims 1 to 5, characterized in that movement groups (3, 6, 8, 17.1, 17.2, 21.1, 21.2) are provided for the complete release of the belts (5.1, 5.2). Pressing device according to claim 6, characterized in that the movement groups for completely releasing the belts (5.1, 5.2) contain two pairs of deflection rollers (17.1, 17.2, 21.1, 21.2) which can be adjusted along a movement link. Pressing device according to one of the preceding claims, characterized in that a deflection roller (16.1) adjustable in two directions (A₁, A₂) is provided for adjusting the belt lengths, and both pressure belts (5.1, 5.2) are guided around them. Pressure device according to one of the preceding claims, characterized in that at least one pressure belt (5.1, 5.2) has a structured surface. Operation of a pressing device for winding machines according to claim 8, characterized in that the tensile force of the pressing belts (5.1, 5.2) is controlled during the winding process. Pressing device according to claim 1, characterized in that a first belt (5.1) and a second belt (5.2) are arranged in such a way that at the beginning of the winding process a section of the first belt (5.1) and the second belt (5.2) each by one an axis (11, 45) pivotable swivel arm (6, 46) against which the winding mandrel is steered, and that the first belt (5.1) of the periphery of the winding mandrel lies over a sector of at least 130 ° and the second belt (5.2) of the periphery of the mandrel lies over a sector of at least 160 °. Pressing device according to Claim 11, characterized in that, in order to completely release the belts (5.1, 5.2), the two swivel arms (6, 46) are arranged such that they can be swiveled away completely from the region of the printed product roll. Pressing device according to one of claims 11 or 12, characterized in that it has an ejection plate (50) which is operatively connected to a drive (52, 51) in such a way that on the one hand it is pivotable perpendicular to the axis of the winding mandrel (1) and on the other hand parallel to the Axis of the mandrel is displaceable. Pressing device according to one of claims 12 or 13, characterized in that it has a ventilation lever (60) on the stationary at least one deflection roller (41, 42) over which one of the belts (5.1, 5.2) runs and can be pivoted during winding the second pivoting lever (46) arranged for the winding process in the area of the drive (52, 51) of the ejection plate (50), and that the ventilation lever (60) is operatively connected to a drive such that it can be pivoted perpendicular to the winding axis. Pressing device according to claim 14, characterized in that it has guides in such a way that the second swivel arm (46) is moved around the winding during the pivoting movement of the ventilation lever (60). Operation of a pressing device according to one of claims 11 to 15, characterized in that for changing the winding, the pressing belts (5.1, 5.2) are simultaneously lifted at the same time and the ejection plate (50) is pivoted laterally on the winding (7), that then by movement of the Ejection plate (50) parallel to the axis of the winding mandrel (1) and the winding is then ejected at the same time the ejection plate (50) swivels and the straps (5.1, 5.2) are closed around the winding mandrel. Operation according to claim 16, characterized in that the ejection plate (50) is displaced parallel to the axis of the winding mandrel (1) during the winding process. Operation according to claim 17, characterized in that the ejection plate (50) is pivoted perpendicular to the axis of the winding mandrel (1) during the winding process.

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