EP3536643B1 - Turret coiling machine with electrostatic fixing of the beginning of the web - Google Patents

Description

The invention relates to a turret winding machine for winding up an essentially insulating web material with electrostatic fixing of the beginning of the web on a winding core.

Web materials are wound up into a roll, in particular directly after they have been produced, broken down into narrower webs, printed or further processed into bags, sacks or other packaging materials. Spiral winding machines in particular are used for this. These have a rotatable winding core carrier on which several winding cores are rotatably mounted. By rotating the winding core carrier, the winding cores are shifted one after the other into a winding-on position for winding on a beginning of the web and into a winding-up position for further winding up of the web material. When the roll is fully wound in the winding position, the web material is severed by means of a cutting blade between the winding-on position and the winding-up position, and the following beginning of the web is wound onto the winding core in the winding-on position. During initial winding, the fully wound roll is removed from the winding core support and replaced with an unwound winding core. Thereafter, while the web material is continuously being wound onto the other winding core, the winding core support is rotated until the winding core that has just been wound has reached the winding position and the still unwound winding core has reached the initial winding position, and the process begins again.

Conventionally, sleeves (eg made of metal or cardboard) with special adhesive tapes are used as winding cores, which fix the beginning of the web on the circumference of the sleeves. Gluing the beginning of the web limits the process speed, is expensive because of the adhesive tapes and is problematic for web materials for food.

The term "adhesive-free initial winding" refers to the fixing of the beginning of the web on a winding core during initial winding by means of electrostatic charging.

When processing a web material that is essentially insulating, the web material can become highly electrostatically charged, in particular as a result of movement, deflection, friction, stretching and the use of electrostatic printing aids (ESA). The charges are stored in the material wound into a roll in a manner similar to that in a wound capacitor. As a result, voltage flashovers can occur during further processing of the web material, which endangers workers. Therefore, devices for unloading the continuous web material are known.

The EP 3 222 421 A1 proposes a take-up device with a device for transferring electrical charges to the web material on the take-up roll and/or during deflection onto the take-up roll, which is connected to at least one electrical high-voltage source of positive or negative polarity, to compensate for unwanted charges. Also EP 0 183 135 A1 proposes a turret winder with a device for transferring electrical charges to fix the beginning of the web to the take-up roll.

Proceeding from this, the invention is based on the object of creating a turret winding machine for winding up an essentially insulating web material with electrostatic fixation of the beginning of the web with more favorable manufacturing and operating properties.

The object is achieved by a turret winding machine having the features of claim 1. Advantageous embodiments of the turret winding machine are specified in the dependent claims.

• einen drehbar um eine Drehachse gelagerten Wickelkernträger mit zwei Seitenteilen, die in einem Abstand voneinander angeordnet sind und an den einander zugewandten Seiten in verschiedenen Umfangspositionen jeweils Halteeinrichtungen zum lösbaren Halten an den beiden Enden und drehbaren Lagern eines Wickelkernes um eine zur Drehachse parallele Wickelachse aufweisen,
• eine Antriebseinrichtung, die mit dem Wickelkernträger gekoppelt ist, um den Wickelkernträger mit den einen Halteinrichtungen und dem davon gehaltenen Wickelkern in eine Anwickelposition und gleichzeitig die anderen Halteeinrichtungen mit dem davon gehaltenen Wickelkern in eine Aufwickelposition zu verlagern,
• drehbar gelagerte Anpresswalzen, von denen eine zwischen den beiden Seitenteilen in radialer Richtung auf den Wickelkern in der Anwickelposition zu verlagerbar ist und die andere zwischen den beiden Seitenteilen in radialer Richtung auf den Wickelkern in der Aufwickelposition zu verlagerbar ist,
• eine Schneideinrichtung mit einem Schneidmesser und einer Verlagerungseinrichtung, um das Schneidmesser zwischen den beiden Seitenteilen in den Abstandsbereich zwischen der Anwickelposition und der Aufwickelposition hinein zu verlagern, um hierbei ein über die Anpresswalze neben der Anwickelposition auf der den Wickelkern in der Anwickelposition zugewandten Seite zum Wickelkern in der Aufwickelposition geführtes Bahnmaterial zu durchtrennen,
• eine Einrichtung zum Übertragen elektrischer Ladungen auf das Bahnmaterial, die zwischen der Anpresswalze, die auf den Wickelkern in der Anwickelposition zu verlagerbar ist, und dem Verlagerungsweg des Schneidmessers beim Auftrennen des Bahnmaterials angeordnet ist,
• mindestens eine elektrische Hochspannungsquelle, die mit der Einrichtung zum Übertragen elektrischer Ladung verbunden ist und
• eine elektrische Steuerungseinrichtung, die ausgebildet ist, beim Aufwickeln des Bahnmaterials auf den Wickelkern an die Einrichtung zum Übertragen elektrischer Ladungen mindestens eine elektrische Spannung mit einer Höhe und/oder Polarität anzulegen, die zur Kompensation auf dem Bahnmaterial vorhandener Ladungen geeignet ist, und beim Durchtrennen des Bahnmaterials an die Einrichtung zum Übertragen elektrischer Ladungen mindestens eine elektrische Spannung mit einer Höhe und/oder Polarität anzulegen, die geeignet ist, dem auf das abgetrennte Bahnende nachfolgenden Bahnanfang eine Ladung zum Fixieren des Bahnanfanges auf dem Wickelkern in der Anwickelposition zuzuführen.

The turret winding machine according to the invention for winding an essentially insulating web material with electrostatic fixation of the beginning of the web on a winding core comprises:

• a winding core carrier mounted rotatably about an axis of rotation with two side parts which are arranged at a distance from one another and have holding devices on the sides facing one another in different circumferential positions for releasably holding a winding core at the two ends and rotatably mounting a winding core about a winding axis parallel to the axis of rotation,
• a drive device which is coupled to the winding core carrier in order to move the winding core carrier with the one holding device and the winding core held by it into a winding position and at the same time the other holding devices with the winding core held by it into a winding position,
• rotatably mounted pressure rollers, one of which can be displaced between the two side parts in the radial direction towards the winding core in the winding position and the other can be displaced between the two side parts in the radial direction towards the winding core in the winding position,
• a cutting device with a cutting knife and a displacement device in order to displace the cutting knife between the two side parts into the space between the winding-on position and the winding-up position, in order to thereby over the pressure roller next to the winding-on position on the winding core in the winding-on position to sever the web material guided in the winding position on the side facing the winding core,
• a device for transferring electrical charges to the web material, which is arranged between the pressure roller, which can be displaced towards the winding core in the initial winding position, and the displacement path of the cutting blade when the web material is being separated,
• at least one high voltage electrical source connected to the electrical charge transfer device and
• an electrical control device which is designed, when the web material is being wound onto the winding core, to apply at least one electrical voltage with a level and/or polarity to the device for transferring electrical charges which is suitable for compensating for the charges present on the web material, and when the web material is severed web material to the device for transferring electrical charges to apply at least one electrical voltage with a magnitude and/or polarity which is suitable for supplying a charge to the web beginning following the severed web end for fixing the web beginning on the winding core in the initial winding position.

In the turret winding machine according to the invention, with the same device for transferring electrical charges to the start of the web, charge is applied to fix it on the winding core in the initial winding position, and during further winding onto the same winding core, the charge required to compensate for charging during the production or processing of the web material is applied to the web material . This is done by arranging the means of transmission electrical charges between the pressure roller, which can be displaced towards the winding core in the initial winding position, and the displacement path of the cutting blade when the web material is cut open. Because of this arrangement, both undesired charge of the web material before winding onto the winding core in the winding position can be compensated and after the web material has been severed, the following beginning of the web can be provided with a suitable charge for fixing on the winding core in the winding position. By means of the electrical control device, the charging of the beginning of the web before fixing can be controlled in such a way that, despite the web material being charged during its production or further processing, adequate fixing on the winding core is achieved. Due to the fact that the device for transferring electrical charges takes over both the fixing of the beginning of the web and the compensation of electrical charges on the web material, components are saved and the space required is reduced. As a result, the outlay for production and operation can be reduced.

According to one embodiment of the invention, the high voltage electrical source supplies high electrical voltages of different polarity. The electric control device controls which of the electric high voltages with different polarity are applied to the electric charge transfer device. If the device for transferring electrical charges is designed as a needle electrode, a high voltage of different polarity can be applied to different rows of needles or a high voltage of a specific polarity can be applied to one row of needles and ground can be applied to another row of needles. In the case of a needle electrode with only a single row of needles, a high voltage of a certain polarity can be applied to this row of needles and the housing to ground. For loading the beginning of the web for fixing to the winding core a high voltage of the same polarity can be applied to one or two rows of needles of a needle electrode.

According to a further embodiment, the electrical high-voltage source supplies at least one adjustable high voltage to the device for transferring electrical charges onto the web material. By adjusting the high voltage, it is possible to optimize the charge supplied to the web material to compensate for charging of the web material. Furthermore, the charge supplied to the start of the web for fixing the web material to the winding core can be optimized.

According to a further embodiment, the electrical control device is designed in such a way that it applies at least one electrical voltage to the device for transferring electrical charges with a level and/or polarity that causes the beginning of the web to be charged, which depends on the charging of the supplied web material. The level and/or polarity of the charge for fixing the beginning of the web on the winding core can be set depending on the level and/or polarity of the charge to compensate for the charging of the web material, e.g. according to a table based on empirical values.

According to a further embodiment, at least one field strength measuring device is arranged in such a way that it detects the web material fed to the turret winding machine, preferably when it is deflected onto the winding core or onto the winding core, with the field strength measuring device determining the charge that the web material has and being connected to the electrical control device , which is designed to apply a high voltage with a level and/or polarity to the device for transferring electrical charges that is determined by the charge of the web material measured by the field strength measuring device depends. The electrical control device can determine the high voltage required to compensate for the charging and/or the high voltage required to charge the beginning of the web for fixing it on the winding core, taking into account the measured charging.

According to a further embodiment, the electrical control device is designed in such a way that when the web material is being wound onto the winding core, it applies a high voltage to the device for transferring electrical charges with a level and/or polarity which causes minimal charging of the web material wound onto the winding core. This minimizes the risk of voltage flashovers.

According to a preferred embodiment of the invention, the means for imparting electrical charges to the sheet material is a charging electrode arranged so that the sheet material passes through the effective range of the charging electrode. Since the charging electrode can act on the web material from a distance, it is possible to position and/or relocate the charging electrode so that it does not collide with moving parts. In addition, by arranging the charging electrode at a distance from the web material, changes in the course of the web material can be bridged to a limited extent, for example due to the increase in the roll diameter when the web material is wound onto the winding core.

According to a further embodiment, the effective area of the charging electrode is defined as the area in which the field strength of the electric field generated by the charging electrode is at least 1% of the maximum field strength of this field, preferably at least 5%, preferably at least 10%, more preferably at least 20%. , preferably at least 50%.

According to a further embodiment, when the beginning of the web is fixed on the winding core, the charging electrode is arranged in such a way that its effective area covers the outer circumference of the winding core arranged in the winding station. This is particularly advantageous for fixing the beginning of the web on the winding core. According to a further embodiment, the charging electrode is arranged on the same side of the web material as this pressure roller, next to the pressure roller that can be moved onto the winding core in the winding station. According to a further embodiment, when the beginning of the web is fixed on the winding core, the charging electrode is directed with its effective area through the web material onto the outer circumference of the winding core in the winding station.

According to a further embodiment, the charging electrode is aligned with its effective area tangentially to the pressure roller that can be displaced on the winding core in the winding station. According to a further embodiment, the charging electrode is aligned radially to the winding core in the winding station when the web material is cut through.

According to a further embodiment, the charging electrode is a bar-shaped charging electrode. According to another embodiment, the charging electrode is a needle electrode. The charging electrode is preferably designed like a charging electrode that is used for the " top-loading " of impression rollers in electrostatic printing aids (ESA). According to a preferred embodiment, the charging electrode is a bar-shaped needle electrode designed as shown in FIG EP 1 640 160 B1 described, in particular as the needle electrode according to 1 to 10 or 11 to 14 of this specification. According to a In another embodiment, the needle electrode has two parallel rows of needles. This is advantageous for neutralizing the charge on the web material by applying a positive high voltage to one row of needles and applying a negative high voltage to the other row of needles, or applying a positive or negative high voltage to one row of needles and grounding the other row of needles. The same voltage can be applied to both rows of needles to charge the beginning of the web.

In the case of a needle electrode, the effective area is aligned axially in the direction of the needles. The effective area can be characterized by the course of the field lines. These are lines of constant field strength. In the case of a needle electrode, the course of the field lines is elliptical, with the main axes of the ellipses being aligned in the direction of the needles and the secondary axes being perpendicular thereto.

According to a further embodiment, the cutting device is designed in such a way that the displacement path of the cutting knife when cutting the web material runs between the winding core in the initial winding position and the axis of rotation of the winding core support. The displacement path of the cutting blade preferably runs at a distance from the winding core in the winding-on position which is less than half the distance of this winding core from the axis of rotation of the winding core carrier. As a result, the web material is separated at a short distance from the winding core in the winding-on position, so that the beginning of the following web wraps around the winding core in the winding-on position. The wrapping and fixing is achieved by the electrical charging of the beginning of the web and, if necessary, the winding core.

According to another embodiment, the device for transferring electrical charges and the pressure roller arranged next to the winding position are fixed to the same supporting structure. This is advantageous for positioning the device for transferring electrical charges, so that the start of the web is securely fixed on the winding core in the initial winding position.

According to a further embodiment, the support structure can be moved into and out of the area between the side parts by means of an infeed device. By shifting the support structure out of the area between the two side parts, it is possible to rotate the winding core carrier without colliding with the support structure and the components attached to it. According to a further embodiment, the electrical control device is connected to the infeed device and is designed in such a way that the support structure with the pressure roller mounted on it is moved out of the area between the two side parts after the beginning of the web has been wound and after the winding core on which the web material is wound has been rotated is shifted from the winding-up position to the winding-up position in the position adjacent to the unwound winding core rotated into the winding-up position. When the support structure is shifted out of the area between the two side parts, the web material continues to run over the pressure roller mounted thereon onto the winding core in the initial winding position. Here, the web material continues to be guided past the device for transferring electrical charges, which is attached to the support structure. This also compensates for charging of the web material when the supporting structure is shifted out of the area between the side parts. Even when the winding core carrier rotates the winding core from the initial winding position to the winding position, the web material is guided past the device for transferring electrical charges, so that the compensation of charges can be continued. After the winding core carrier the winding core has turned from the winding-on position into the winding-up position, the supporting structure with the pressure roller is shifted between the side parts next to the still unwound winding core in the winding-on position. In this case, the device for transferring electrical charges remains in the vicinity of the web material passing through, so that it can continue to compensate for charges on the same. During the subsequent separation of the web material, a high voltage is transmitted to the device for transferring electrical charges in order to fix the beginning of the web on the winding core in the initial winding position.

According to a further embodiment, the turret winding machine comprises a blowing device which has at least one air outlet opening which is directed towards the web material between the pressure roller, which can be displaced towards the winding core in the initial winding position, and the displacement path of the cutting blade when the web material is cut open, and which is directed to a compressed air source connectable or connected. The blowing device supports the positioning and fixing of the beginning of the web on the winding core arranged in the initial winding position. According to a further embodiment, the blowing device is bar-shaped with a compressed air duct which can be connected or connected to a compressed air source and has at least one air outlet opening, preferably at least one row of air outlet openings, on one side, with each air outlet opening being connected to the compressed air duct. The bar-shaped blowing device is aligned with the at least one air outlet hole on the web material and preferably perpendicular to the running direction of the web material.

According to a further embodiment, the blowing device is integrated into or attached to the device for transferring electrical charges. According to a further embodiment, the device for transferring electrical charges with an integrated blowing device is a needle electrode with one or two rows of needles, which has a compressed air duct and a series of air outlet openings which are connected to the compressed air duct. This is a particularly space-saving design. According to a further embodiment, the air outlet openings are arranged between two rows of needles. According to a further embodiment of a needle electrode with one or two rows of needles, the compressed air channel is connected to a connecting piece for compressed air, which protrudes from one end of the needle electrode.

According to a further embodiment, the device for transferring electrical charges is a bar-shaped needle electrode with one or two rows of needles, and the blowing device is a bar-shaped blowing device which is attached to the side of the bar-shaped needle electrode and, as described above, has a compressed air duct and at least one air outlet opening connected to it.

According to a further embodiment, the blowing device is connected to a switchable valve (switching valve) which is connected or can be connected to the compressed air source. The blowing device can be connected to the compressed air source via the switchable valve when the web material is being cut open, in order to support the initial winding process. When winding up further, the blowing device can be separated from the compressed air source via the switchable valve. According to a further embodiment, the switchable valve is connected to a compressed air duct of the blowing device, which in turn is connected to the at least one air outlet opening.

According to a further embodiment, the electrical control device is connected to the switchable valve and is designed to open the switchable valve when the web material is severed, so that compressed air can flow through the at least an air outlet opening of the blowing device exits, which moves the beginning of the web to the winding core in the initial winding position. According to a further embodiment, the electrical control device simultaneously applies the electrical high voltage for fixing the beginning of the web to the device for transferring electrical charges and switches on the switchable valve which connects the blowing device to the compressed air source. According to a further embodiment, the electrical control device is designed to close the switchable valve after the beginning of the web has been wound onto the winding core in the winding-on position. According to a further embodiment, the electrical control device switches off the high voltage for fixing the beginning of the web and the blowing device at the same time. However, it is also possible to switch on the high voltage for fixing and to switch on the blowing device and/or to switch off the high voltage for fixing and to switch off the blowing device with a time delay.

According to a further embodiment, the cutting device is designed in such a way that the cutting blade, in the starting position before it runs through the path for severing the web material, is arranged on the same side of the web material as the device for transferring electrical charges. This makes it possible to bring the cutting device with the cutting blade to the web material from the same side as the device for transferring electrical charges. This is advantageous for a space-saving construction. According to a further embodiment, the cutting device comprises a displacement device which is designed to displace the cutting blade in a direction that cuts the web material in order to sever the web material. According to a further embodiment, the displacement device is designed to displace the cutting knife out of the area between the two side parts and into the area between the two side parts. If the cutting knife shifted out of the area between the side parts, it does not hinder the rotation of the winding core support. To cut through the web material, the cutting blade is moved into the area between the side parts. According to a preferred embodiment, the displacement device is a separate device from the delivery device.

According to a preferred embodiment not claimed, the cutting blade has a cutting edge which extends over the entire width of the web material. As a result, the strip material is cut off in a straight line and wound up evenly on the winding core.

According to a further embodiment not claimed, the side parts of the winding core carrier are disks, in particular circular disks. According to a further embodiment, the side parts each have support arms which protrude radially with respect to the axis of rotation and on which the holding devices are arranged. Free spaces are preferably present between the support arms. The side parts can be formed exclusively by the support arms.

According to a further embodiment, the electrical control device is designed in such a way that while the web material is being separated by means of the cutting device and/or a defined period of time before the web material is severed by means of the cutting device of the device for transferring electrical charge, it does not apply any high electrical voltage to compensate for charging of the web material feeds more and instead feeds an electrical high voltage to the device for transferring electrical charge in order to fix the beginning of the web on the winding core in the winding-on position. This ensures that charges are fed to the beginning of the web for fixing on the winding core in the initial winding position. When the charges for fixing the web material are fed in before the cutting knife cuts through, charges are also fed to the leading end of the web, the level of which, however, is so low that it does not cause any voltage flashovers from the roll that could endanger the worker. In addition, these charges can fix the end of the web on the finished roll. The period of time during which the corresponding charges are fed before the web material is separated can be determined as a function of the throughput speed, the charges required to fix the beginning of the web on the winding core in the winding position and the charges that can be fed to the end of the web without the risk of voltage flashovers endangering the work personnel become.

According to a further embodiment, the electrical control device is designed in such a way that it supplies the web material with the electrical high voltage for fixing the beginning of the web on the winding core in the initial winding position for a specific period of time. This period of time is preferably selected in such a way that it is sufficient for the web material to be securely fixed to the winding core and the charges fed to the roll in this way do not cause any voltage flashovers that could endanger the work personnel.

The essentially insulating web materials are in particular plastic films or composite films containing a plastic or web materials made from plastic films or composite films. Composite films can contain the plastic, for example, in the form of a plastic film, an extruded layer or applied plastic films. In addition, they include, for example, a metal foil, a paper web, a cardboard web or another plastic film. In addition, the composite film can comprise a combination of any one or more of the aforementioned components. The web material can in particular be a printing material. The web material can in particular be a printing material printed in a printing machine. This can in particular be a packaging material.

According to a further embodiment, the turret winding machine is part of a rotary printing machine or a web-fed printing machine. According to a further embodiment, it is a gravure printing press, flexographic printing press, offset printing press, letterpress printing press, planographic printing press or screen printing press.

According to a further embodiment, the turret winding machine is part of a slitting machine.

According to a further embodiment, the turret winding machine is part of a film extrusion machine.

According to a further embodiment, the turret winding machine is part of a laminating machine.

Furthermore, the turret winding machine according to the invention can be used in other areas of application in which web material made from essentially electrically insulating material is wound up into a roll.

• einen Wickelkernträger mit Seitenteilen, die an verschiedenen Umfangspositionen Halteeinrichtungen zum drehbaren Lagern eines Wickelkernes aufweisen,
• eine mit dem Wickelkernträger gekoppelte Antriebseinrichtung, um einen Wickelkern in eine Anwickelposition und gleichzeitig einen anderen Wickelkern in eine Aufwickelposition zu verlagern,
• Anpresswalzen, von denen eine auf den Wickelkern in Anwickelposition und die andere auf den Wickelkern in Aufwickelposition zu verlagerbar ist,
• eine Schneideinrichtung, um mit einem Schneidmesser ein über die Anpresswalze auf der dem Wickelkern in der Anwickelposition zugewandten Seite zum Wickelkern geführtes Bahnmaterial zu durchtrennen,
• eine elektrische Hochspannungsquelle
• eine damit verbundene Einrichtung zum Übertragen elektrischer Ladungen auf das Bahnmaterial zwischen der Anpresswalze und dem Verlagerungsweg des Schneidmessers,
• eine elektrische Steuerungseinrichtung, die ausgebildet ist, um an die Einrichtung zum Übertragen beim Aufwickeln eine elektrische Spannung zur Kompensation auf dem Bahnmaterial vorhandener Ladungen anzulegen und beim Durchtrennen dem Bahnanfang eine Ladung zum Fixieren des Bahnanfanges auf dem Wickelkern zuzuführen.

Furthermore, the object is achieved by a non-claimed turret winding machine for winding a substantially insulating web material with electrostatic fixation of the beginning of the web on a winding core with the following features:

• a winding core carrier with side parts which have holding devices for rotatably supporting a winding core at different circumferential positions,
• a drive device coupled to the winding core carrier in order to move a winding core into a winding-on position and at the same time another winding core into a winding-up position,
• Pressure rollers, one of which can be moved towards the winding core in the winding position and the other towards the winding core in the winding position,
• a cutting device in order to use a cutting blade to cut through a web material guided over the pressure roller on the side facing the winding core in the initial winding position to the winding core,
• a high voltage electrical source
• associated means for transferring electrical charges to the web material between the pressure roller and the displacement path of the cutting blade,
• an electrical control device which is designed to apply an electrical voltage to the device for transmission during winding to compensate for charges present on the web material and to feed a charge to the beginning of the web during cutting to fix the beginning of the web on the winding core.

Embodiments of the turret winding machine are specified in the dependent claims and in the above description.

Fig. 1

Wendewickelmaschine in einem Teilschnitt;

Fig. 2

vergrößertes Detail von Fig. 1.

An exemplary embodiment of the invention is explained below with reference to the attached drawings. In the drawings show:

1

turret winding machine in a partial section;

2

enlarged detail of 1 .

According to 1 and 2 a turret winding machine 1 has a winding core carrier 2 with two circular disc-shaped side parts 3, one of which is shown. The two side parts 3 are arranged at a distance from one another, parallel to one another and with their center on the same axis of rotation 4 .

On the sides facing one another, the side parts 3 have holding devices 5, 6 for the detachable holding and rotatable mounting of winding cores 7, 8.

The holding devices 5, 6 are pins, for example with a cylindrical shape. The winding cores 7, 8 are sleeves, in the ends of which the pins 5, 6 can be inserted. The sleeves and the pins have a tongue and groove connection 9, 10, 11, 12.

The holding devices 5, 6 are each coupled to a winding drive device in order to rotate the winding cores 7, 8 about winding axes which are parallel to the axis of rotation 4.

In the 1 holding devices 5 arranged on the left side of the axis of rotation 4 are in a winding position and those on the right side of the axis of rotation 4 arranged holding devices 6 are in a winding position.

The winding core carrier 2 is coupled to a drive device 13 in order to rotate the winding core carrier 2 about its axis of rotation 4 optionally with one holding device 5 into the winding position at the same time as the other holding devices 6 in the winding position and vice versa. For the purpose of coupling, the drive device 13 and the winding core carrier 2 have toothed rims 14, 15 on their circumferences, which mesh.

A pressure roller 16 is arranged parallel to the winding core 7 next to the initial winding position. The pressure roller 16 is mounted on a support structure 17 in the form of a beam. In the winding-on position shown, there is a gap between the winding core 7 arranged in the winding-on position and the pressure roller 16 .

The support structure 17 can be moved by means of an infeed device from the position shown at a distance from the winding core 7 to the winding core 7, so that it bears against the latter and rolls on it. The infeed device is designed in such a way that the support structure 17 with the pressure roller 16 can be pulled out of the area between the side parts 3 in order to enable the winding core carrier 2 to rotate.

A further pressure roller 18 is arranged between the two side parts 3 next to the winding core 8 in the winding position. The additional pressure roller 18 can be advanced radially towards this winding core 8 by means of an infeed device 10 . This device for feeding 19 can in particular be a device which presses the further pressure roller 18 against the circumference of the winding core 8 under pretension.

A web material 20 is guided on the winding core 7 side in the winding position over the circumference of the pressure roller 16 onto the winding core 8 in the winding position.

When being wound onto the winding core 8 in the winding position, the web material 20 can be pressed against the winding core 8 by the additional pressure roller 18 .

A device for transferring electrical charges 21 is fixed at the end of the support structure 17, this being a bar-shaped charging electrode which is designed as a needle electrode.

The area of action of the charging electrode 21 is characterized by elliptical field lines 22 . The charging electrode is aligned with its effective area in such a way that it touches the pressure roller 16 and hits the winding core 7 radially in the initial winding position.

The charging electrode is electrically connected to a high-voltage electrical source 23 .

A blowing device is integrated into the needle electrode 21 . This comprises a compressed air channel directed in the longitudinal direction of the needle electrode, a connecting piece for compressed air at one end of the needle electrode and a row of air outlet openings on the side of the needle electrode on which it has the needles from which the field lines emanate.

A cutting knife 24 of a cutting device 25 is arranged further away from the winding station in the direction of passage of the web material 20 than the Device for transferring electrical charges 21. Charging electrode and cutting knife 24 are on the same side of the web material 20. The cutting device 25 comprises a displacement device which is designed to move the cutting knife 24 perpendicular to the web material 20 into the area between the initial winding position and the winding position in order to to cut through the web material 20.

The electrical high-voltage supply 23, the drive device 13 for the winding core support 2, the winding drive devices, the infeed device for the pressure roller 16 and the charging electrode 21 and the displacement device of the cutting device 25 are connected to an electrical control device 26.

When winding the web material 20 onto the winding core 8 in the winding position into a roll 27, the electrical control device 26 controls the drives so that the movable components change the position of 1 assume. The electrical high-voltage supply 23 controls it in such a way that the charging electrode 21 compensates for charging of the web material 20 as a result of a previous production and/or processing operation. This avoids that charges are stored in the roll 27 on the winding core 8 .

When the roll 27 is fully wound, the control device 26 controls the cutting device 25 so that the cutting knife 24 cuts through the web material 20 . A certain period of time before or at the same time as the cutting, the control device 26 controls the high-voltage supply 23 in such a way that the charging electrode 21 no longer compensates for the charging of the web material 20 . Instead, the applied high voltage generates an electrical field which causes the start of the web behind the cut on the winding core 7 in the initial winding position fixed. At the same time, the pressure roller 16 can be pressed against the winding core 7 from the outside. In addition, the control device 26 connects the blowing device to a high-pressure source via a switchable valve, so that the beginning of the web is additionally pressed against the winding core 7 by the compressed air emerging from the air outlet openings. As a result, the start of the web is wound onto the winding core 7 .

After the initial winding, the support structure 17 is moved out of the area between the side parts 3 by means of the infeed device. Furthermore, the cutting knife 24 is shifted out of the area between the two side parts 3 by means of the shifting device. The web material 20 continues to be guided over the pressure roller 16 onto the winding core 7 and wound up. Here, the web material 20 continues to run past the charging electrode 21 . As a result, charging of the web material 20 can continue to be compensated for by the charging electrode 21 .

After the roll 27 has been replaced by an empty winding core 8, the winding core support 2 is rotated by the drive device 13 so that the unwound winding core 2 reaches the winding-on position and the partially wound winding core 7 moves into the winding-up position. During this process, further web material 20 is continuously wound onto the winding core 7 . After the winding core carrier 2 has been rotated, the pressure roller 16 and the charging electrode 21 are moved back into the area between the side parts 3 by means of the infeed device and the cutting knife 24 by means of the displacement device. Then they take the in again figure 1 and 2 shown position next to the winding position, which is occupied by the unwound winding core 8.

Claims (20)

1. A turret winding machine for winding a substantially insulating web material with electrostatic fixing of the beginning of the web on a winding core, comprising:

   • a winding core carrier (2), mounted rotatably about an axis of rotation, with two side parts (3), which are arranged at a distance from each other and each have holding apparatuses (5, 6) on the sides facing each other at various circumferential positions for releasably holding at the two ends and mounting a winding core (7, 8) rotatably about a winding axis parallel to the axis of rotation (4),

   • a drive apparatus (13), which is coupled to the winding core carrier (2) to displace the winding core carrier (2) with the one holding apparatuses (5) and the winding core (7) held by them into a winding-on position and simultaneously to displace the other holding apparatuses (6) with the winding core (8) held by them into a winding position,

   • rotatably mounted pressing rollers (16, 18), of which one can be displaced between the two side parts (3) in the radial direction towards the winding core (7) in the winding-on position and the other can be displaced between the two side parts (3) in the radial direction toward the winding core (8) in the winding position,

   • a cutting apparatus (25) with a cutting blade (24) and a displacement apparatus to displace the cutting blade (24) between the two side parts (3) into the distance range between the winding-on position and the winding position in order to thereby cut through a web material (20) guided to the winding core (8) in the winding position by the pressing roller (16) next to the winding-on position on the side facing the winding core (7) in the winding-on position,

   • an apparatus for transferring electric charges (21) to the web material (20), which is arranged between the pressing roller (16), which can be displaced toward the winding core (7) in the winding-on position, and the travel path of the cutting blade (24) when separating the web material (20),

   • at least one electric high-voltage source (23), which is connected to the apparatus for transferring electric charges (21), and

   • an electric control apparatus (26), which is designed, when the web material (20) is being wound onto the winding core (7), to apply to the apparatus for transmitting electric charges (21) at least one electric voltage with an intensity and/or polarity that is suitable to compensate for charges present on the web material (20), and, when the web material (20) is cut through, to apply to the apparatus for transferring electric charges (21) at least one electric voltage with an intensity and/or polarity that is suitable for supplying a charge to the beginning of the web that follows the separated end of the web in order to fix the beginning of the web to the winding core (7) in the winding-on position.
2. The turret winding machine according to claim 1, in which the electric high-voltage source (23) delivers high voltages of different polarities.
3. The turret winding machine according to claim 1 or 2, in which the electric high-voltage source (23) delivers at least one adjustable high voltage.
4. The turret winding machine according to one of claims 1 to 3, in which the electric control apparatus (26) is designed so that it applies at least one electric high voltage to the apparatus for transferring electric charges (21), the intensity and/or polarity of said voltage being dependent on the charge of the web material (20) that is supplied to the turret winding machine.
5. The turret winding machine according to one of claims 1 to 4, which comprises at least one field strength meter that is arranged so that it detects the web material (20) supplied to the turret winding machine (1), preferably upon deflection onto the winding core (7), or on the winding core (7), wherein the field strength meter determines the charge that the web material (20) has and is connected to the electric control apparatus (26), which is designed to apply to the apparatus for transferring electric charges (21) a high voltage with an intensity and/or polarity that depends on the charge of the web material (20) measured by the field strength meter.
6. The turret winding machine according to one of claims 1 to 5, in which the electric control apparatus (26) is designed so that, when the web material (20) is being wound onto the winding core (7), it applies to the apparatus for transferring electric charges (21) a high voltage with an intensity and/or polarity that causes a minimal charge of the web material (20) wound onto the winding core (7).
7. The turret winding machine according to one of claims 1 to 6, in which the apparatus for transferring electric charges (21) to the web material (20) is a charging electrode that is arranged so that the web material (20) runs through the effective range of the charging electrode (21).
8. The turret winding machine according to claim 7, in which the charging electrode (21) is a needle electrode, preferably a charging electrode with two rows of needles.
9. The turret winding machine according to one of claims 1 to 8, in which the effective range of the charging electrode (21), when the web material (20) is separated, is aligned tangentially to the pressing roller (16) next to the winding-on station and radially to the winding core (7) in the winding-on station.
10. The turret winding machine according to one of claims 1 to 9, in which the cutting apparatus (25) is designed so that the travel path of the cutting blade (24), when the web material is separated, runs between the winding core (7) in the winding-on position and the axis of rotation (4) of the winding core carrier (2), wherein preferably the travel path of the cutting blade (24) runs at a distance from the winding core (7) in the winding-on position that is smaller than half of the distance of this winding core (7) from the axis of rotation (4) of the winding core carrier (2).
11. The turret winding machine according to one of claims 1 to 10, in which the cutting apparatus (25) is designed so that, in the starting position before it traverses the path for separating the web material (20), the cutting blade (24) is arranged on the same side of the web material (20) as the apparatus for transferring electric charges (21).
12. The turret winding machine according to one of claims 1 to 11, in which the apparatus for transferring electric charges (21) and the pressing roller (16) arranged next to the winding-on position are fastened to the same support structure (17).
13. The turret winding machine according to one of claims 1 to 12, in which the electric control apparatus (26) is designed so that, when the web material (20) is separated by means of the cutting apparatus (25) and/or a defined period of time before the web material (20) is cut through by means of the cutting apparatus (25), it no longer supplies the apparatus for transferring electric charges (21) with electric high voltage for compensating for a charge of the web material (20), and instead the apparatus for transferring electric charges (21) supplies an electric high voltage for fixing the beginning of the web to the winding core (7) in the winding-on position.
14. The turret winding machine according to one of claims 1 to 13, in which the electric control apparatus (26) is designed so that it supplies to the web material (20) the electric high voltage for fixing the beginning of the web to the winding core (7) in the winding-on position over a specified period of time.
15. The turret winding machine according to one of claims 1 to 14, which is part of a rotary printing machine or web-fed printing press or a winder or a film extrusion machine or a laminator.
16. The turret winding machine according to one of claims 1 to 15, which comprises a blowing apparatus, which has at least one air outlet opening aimed at the web material between the pressing roller (16), which can be placed up to the winding core (7) in the winding-on position, and the travel path of the cutting blade (24) and which can be connected or is connected to a compressed air source.
17. The turret winding machine according to claim 16, in which the blowing apparatus is integrated into the apparatus for transferring electric charges (21) or is attached to it.
18. The turret winding machine according to claim 16 or 17, in which the blowing apparatus is connected to a switchable valve, which is connected or can be connected to the compressed air source.
19. The turret winding machine according to claim 18, in which the electric control apparatus (26) is coupled to the switchable valve and is designed, when the web material (20) is separated, to open the switchable valve so that compressed air exits from the blowing apparatus, which moves the beginning of the web to the winding core (7) in the winding-on position.
20. The turret winding machine according to claim 19, in which the electric control apparatus (26) is designed to close the switching valve after the beginning of the web has been wound on to the winding core (7) in the winding-on position so that no compressed air exits from the at least one air outlet opening.

Images