EP0618163B1 - Web cutting and attaching device in winders - Google Patents

Description

The invention relates to a device for separating and again Creation of an incoming material web on winding machines on a winding tube, which is driven by a rotating shaft is, the incoming material web by means of a deflection roller partially wrapped by the material web is pressed against the winding tube and the running material web after leaving the winding tube by means of a the path of the material web movable and through an energy store drivable forth extending to the course of the path Cutting knife and the new path start with a firmly connected with the cutting knife across the web extending brush is applied, the separating knife accelerated compared to the running material web becomes that its speed is greater than the running speed the material web.

When winding material webs in particular by a Multiple winding machine, for example a so-called Turret winder, it is important to avoid the web Waste from the finished wound roll as quickly as possible to fold an empty winding tube. After cross cutting the The new start of the web should be wrinkle-free on the material web empty winding tube are created. Cross cutting and feeding devices of this type are known from the prior art. A device of the generic type mentioned Art is in DE-OS 41 07 127 the same applicant described. With this device the cutting knife is opened held on both sides by guide bands, which over rotatable pulleys run and being an electric motor over an axis drives a flywheel, which is flanged over a Coupling the associated roles in accelerated Offset and the guide belts Cutting knife on the cutting point in accelerated motion feeds.

Other cross cutters and feeders work with a stationary, smooth or toothed swivel knife, which strikes in the web to be separated and electrically or pneumatically driven. According to the teaching of DE-OS 24 18 409 is in the running web by means of a Swivel frame a pulley so against the web between the empty winding tube and the full roll pressed that the Web wraps the empty winding tube more than half the circumference, whereupon by on the axis of the pulley pivoted toothed cutting knife, which by the material web is separated by a torsion bar spring and with the cutting knife on the of the pulley opposite side carries a brush that pivots the cutting knife the web to the empty winding tube paints.

A corresponding device is described in DE-OS 22 32 338, the separating element with a pneumatic or hydraulic drive via a rack and a toothed segment is driven, the running path between empty Separates the winding tube and a deflecting element, the separating element is pivoted coaxially to the winding tube and then an air box connected to the separating element presses the beginning of the web against the winding tube. Furthermore are off known prior art application systems in which the Cut separators on the winding tube and special Require winding cores with cutting grooves on the core. Here however occur through the cutting process over time Core damage along with the grooves in the core Cause deformations in the material web in the winding.

The invention was based on the object of a device to create the generic type mentioned above, which Reliable cutting even at high web speeds a running material web and a crease-free application of the new start of the path on the winding tube and in particular also for driving the cutting knife and the brushes required aggregates compared to the above State of the art as wear-free as possible with a minimum of moving parts and light weight of these parts work.

According to the invention, the object was achieved with a device with those mentioned in the characterizing part of claim 1 Characteristics. Further details of the invention go out the dependent claims, the drawings and the description forth.

Figur 1

die Schemazeichnung eines Wendewicklers mit der erfindungsgemäßen Trenn- und Anlegevorrichtung im Moment des Trennvorgangs

Figur 2

ein entsprechendes Schema während des Aufwickelns der Warenbahn auf der Wickelhülse nach dem Trennvorgang

Figur 3

einen axialen Schnitt durch die Trennvorrichtung

Figur 4

einen radialen Schnitt durch die Trennvorrichtung gemäß Figur 3

Figur 5

den zeitlichen beziehungsweise Winkelverlauf der Drehgeschwindigkeit des Antriebsmotors.

The invention is explained in more detail below with reference to the drawings and shows

Figure 1

the schematic drawing of a turret winder with the separation and application device according to the invention at the moment of the separation process

Figure 2

a corresponding scheme during the winding of the web on the winding tube after the separation process

Figure 3

an axial section through the separating device

Figure 4

3 shows a radial section through the separating device according to FIG. 3

Figure 5

the temporal or angular course of the rotational speed of the drive motor.

The device according to the invention is based on the example of a so-called Wendewicklers explained in more detail, the invention however, in no way limited to this special winding device is, but to all possible from the state of the Technology known winding and separating devices applicable is.

Figure 1 shows the separation and application device at the moment of the separation process. A preferably coated web (1) runs over a deflection roller (2), a so-called outer one Contact roller (3) on the winding tube (4) and wraps around about a quarter of their size. After leaving the web is the winding tube over further deflection rollers (5, 6, 7) wound on a further winding tube (8). The entire device is rotatable in the direction of the arrow with the Pivot point (11). In the described device by means of a The cylinder (22) can be pivoted in via a lever (23) Separating and applying device (9) to be described in more detail. Now the desired diameter is on the winding tube (8) of the winding (24) is reached, the separation and application device (9) swung in, the material web (1), as is further described in more detail below, approximately at the Where she leaves the still empty winding tube (4), across separated and by means of a firmly connected to the cutting knife Applying brush to the winding tube (4) so that the newly created beginning of the web wound on this winding tube becomes. The remaining web is wound on the winding tube (8), this winding tube is braked, the full one The winding is removed and a new one is placed on the winding axis Empty winding sleeve (not shown) placed.

Immediately after the separation process, the separation and application device (9) again pivoted so that it is in the position as indicated in Figure 2 remains. At the same time the inner contact roller (10) is pivoted about the pivot point (21), that they are indicated as the inner contact roller as in Figure 2 lies against the circumference of the winding tube (4) and so smooth winding of the web favors.

If, as described above, a new empty one at position (8) Winding sleeve is plugged in and when subsequently on the Winding sleeve (4) almost the full winding circumference is reached, see above becomes the outer contact roller resting on the winding tube (4) (3) together with the deflection roller (2) by means of the sliding cylinder (25) pivoted and the turret winder rotates 180 ° around the Axis of rotation (11), the core sleeve (4) the material web (1) pulls, the inner contact roller (10) lies during the Swivel process on the winding tube (4) continues until after Completed the 180 ° turn the prepared empty winding tube arrived in the position of the original winding tube (4) and this continues during the winding process is continued, now in the position as the winding tube (8) has arrived with the winding (24). At the end of the turning process the outer contact roller (3) is pivoted again.

It then begins when the wrap is in its full size the position (8) has reached a new separation process, in which first pivoted the inner contact roller (10) and then the separating and applying device (9) together with the deflecting roller (5) is swung into the course of the path.

The essentials of the invention will now be described with reference to FIGS. 3 and 4 Features of the separating and applying device (9) explained. The knife (12) for cross cutting the web is rotatable Shaft (16) firmly connected. The length of the knife is slightly larger than the width of the material web (1). Like the pictures show, the shaft is over lever (15) with the knife (12) connected via a fastening device (26), the knife at a certain angle to the material web (1) is aligned. This angle is preferably approximately 90 °. Also located on the fastener the contact brush (13), which has a slightly larger radius than the knife (12) describes. The shaft (16) with the knife (12) rotates in the direction of the arrow in the same direction as the direction of web travel; is the peripheral speed of the knife (12) greater than the web speed of the material web (1), they is at least 1.5 times. This overtakes the separating and Application device during the rotation of the shaft the material web, so that the contact brush the material web on the Can touch the surface of the winding tube (4). Like the figure 4 shows the ratio of the radii of knife (12) and brush (13) and their respective distance from the winding tube (4) dimensioned so that the free end of the knife is straight is still spaced from the surface of the winding tube (4) and the free end of the contact brush the new one Start of web at an angle between 40 ° and 90 ° at the Specifies the winding tube. The brush is lying in the moment of cross cutting on the material web at about the point where it leaves the winding tube.

The surface of the winding tube cannot be closer by means of a shown spray device (27) with glue or water can be applied to make it easier to glue the web. As well it is also possible, for example in parallel registration DE-GM 9305304.5 described by the applicant, the winding tube (4) to be made from a plastic material with adhesive adhesion. The shaft (16) with the knife (12) is through a hydraulic torque booster (17) with which it is directly connected. Motor and shaft are direct, So without coupling links, connected to each other, for example by pressing appropriately shaped conical Parts of motor shaft and shaft (16) or by others Measures known from the prior art. The wave (16) is mounted on both sides (28, 29).

The hydraulic motor operates at an operating pressure of around 160 bar operated, the hydraulic motor is controlled by an electric stepper motor (corresponds to 1000 steps 360 °). Manufacturers of such engines are, for example SIG (Swiss Industry Company). The whole The arrangement of the motor shaft knife is designed to be low-mass, among other things by using light metal for shaft and Lever that the cutting knife, as shown in Figure 5, for Reaching the full speed only by an angle of is rotated about 130 °, then this speed becomes about maintained for a rotation angle of 130 °, while during the separation process takes place at this time, and then the knife speed again over an angle of about 90 ° decelerated to zero.

Then the separating device (9) is pivoted and during this time the swivel arm will slowly return to its original position, for example by a fork light barrier is marked, turned back so that the separating and Application device prepared for the next separation process is.

To compensate for the enormous acceleration forces caused by the Knife sits on the shaft (16) also via the levers (15) connected a balance shaft (18) opposite the Knife (12). This shaft (18) serves as a counterweight to Knife (12) and can by intermediate washers (19) arranged adjacent a connecting arm to the shaft (18) are balanced so that during the rotation of the Knife the shaft (16) is not deformed and thus that Knife (12) a linear section through the material web accomplished.

It has been shown that with the separation and Application device even at web speeds, which are at 800 m / min, still a perfect cut and a perfect creation of the beginning of the path is possible. To this Way is a largely automated winding, separating and Application procedure for high-speed material webs enables which has a very high production security, none at all Production interruptions are required and largely wear-free is.

Claims (10)

1. A device for cutting and reattaching an incoming material web (1), in winders, to a core (4), which is driven in rotation by a shaft, the incoming material web (1) being pressed onto the core (4) by means of a deflection roll (3), around which the material web wraps partially, and the outgoing material web, after leaving the core (4), being cut by means of a cutting knife (12), which can be moved into the path of the material web, can be driven by a force store (17) and extends transversely with respect to the course of the web, and, following the cutting of the material web (1), the new web start being attached, by an attaching brush (13), which is fixedly connected to the cutting knife (12) and extends transversely with respect to the material web (1), the cutting knife (12), which is connected to a shaft (16), being accelerated with respect to the running material web (1) in such a manner that the speed of the knife (12) is greater than the running speed of the material web (1), wherein the shaft (16), which is acted on by a hydraulic motor (17), can be driven in rotation in the web running direction, and wherein the radius of the cutting knife (12) and that of the attaching brush (13) are dimensioned such that the attaching brush (13) attaches the new web start to the circumference of the core (4) over an angle between 40° and 90°, while the cutting knife (12) just does not touch the core (4), and wherein, for the cutting operation, the shaft (16) with the cutting knife (12) is accelerated to a circumferential speed of at least 1.5 times the running speed of the material web (1).
2. A method of cutting a material web (1), having a device (9) as claimed in claim 1, wherein the hydraulic motor (17), via an intermittent-motion controller, accelerates the shaft (16) with the cutting knife (12) to the circumferential speed of at least 1.5 times the running speed of the material web (1) over about a 130° angle of rotation of the shaft (16) with the cutting knife (12), wherein the position in which the cutting operation is effected is reached in the range between an angle of rotation of about 130° and 260°, and then the rotation is braked and brought to a standstill at about 350° angle of rotation, and the hydraulic motor (17) is subsequently brought into its initial position.
3. A device as claimed in claim 1, wherein the angle between knife and film at the instant of cutting is about 90°.
4. A device as claimed in claim 1, wherein, before the cut, the material web wraps around the core to about one quarter of its circumference.
5. A device as claimed in claim 1, wherein at the instant of the transverse cutting of the material web the attaching brush rests on the core.
6. A device as claimed in claim 1, wherein the cutting and attaching device (9) can be pivoted into the path of the material web (1) immediately before the cutting operation and can be pivoted out once more immediately thereafter.
7. A device as claimed in claim 1, wherein, at least during the winding of one roll of tape, a pressure roller (10, 10') that can be pivoted away rests on each core (4, 8).
8. A device as claimed in claim 1, wherein the surface of the core has contact-adhesive properties, so that after the cutting operation the material web adheres to the core.
9. A device as claimed in claim 1, wherein immediately before the cutting operation the surface of the core is sprayed with an adhesive or with water (27).
10. A device as claimed in claim 1, wherein a compensating shaft (18) of adjustable (19) mass is arranged with respect to the drive shaft (16) so as to lie opposite the cutting knife (12).

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