FI121306B - Device for separation of subways - Google Patents

Description

The invention relates to a device for separating partial webs according to the preamble of claim 1, comprising at least a first curved roll mounted on one side of the web and a second curved roll arranged on the opposite side of the web and a mechanism adapted to act on said rolls. to change the bending angles and thereby achieve the desired separation on the sub-webs.

In the manufacture and processing of a paper web, web application generally refers to both full-width web application before longitudinal and post-longitudinal application, the purpose of which is to separate longitudinally cut narrow sub-webs before forming sub-web rolls.

The transverse compression forces applied to the paper web can cause the web to fold or wrinkle due to the elastic structure 20 of the web. The aim is to prevent the creasing of the web and the formation of wrinkles by means of web application devices. The web application is necessary for the manufacture and / or processing of the fibrous web in a number of different contexts. For example, with a longitudinal cutter, it is essential to guide a straightened and sufficiently tight web between the blades of the longitudinal cutter so that a neat and straight cut is obtained. To this end, at least one spreader device is provided between the rolls of the machine roll and the blades of the winder, for certain types of paper.

US3765616 discloses an apparatus for separating longitudinally cut partial webs in which the relative position of the spreader rolls in the direction of the incoming and outgoing webs is maintained when the amount of spreader is changed. However, the construction variants 2 shown are, in practice, very bulky and relatively complex in their entirety.

The purpose of separating the partial webs is to separate the different partial webs of the web cut, for example, by a longitudinal cut-off 5, in a sufficient distance to ensure that the rolls are separated from each other. In the separation of partial webs, it may be advantageous for certain applications to perform a lateral displacement of the web so as to prevent the web from sliding sideways in the applicator. This is accomplished by guiding the partial webs with the first spreading device 10 folded sideways and reversed in the second direction. It is known to use, for example, bars, beams or rotating roller shells mounted on a curved shaft as spreading devices. The rotating roll sheath may be assembled, for example, of rigid sheath elements or be uniform and elastic. The shell elements may also be separate.

The most common way of adjusting the size of the gap formed in the separation of the partial webs is to accomplish this by adjusting the inclination of the web over the applicator. In this case, the web makes either a steeper or a more sloping angle as it passes through the spreading devices, whereby the distance between the partial webs changes according to the folding angle. When the deflection angles of the spreader track are changed, the direction of curvature of the spreader relative to the track also changes. A change in the direction of curvature with respect to the web causes the lateral direction of the web's rolling component, which causes problems because it generates a frictional force that tends to move the partial webs aside along the desired 25 paths.

EP0431275A2 discloses a device for separating partial webs, wherein the correction of the directional angle of the curved rolls is mechanically forced so that the device has an adjusting mechanism adapted to correct the directional angle between the rolls and the web at any angle of inclination. arranged to rotate the rolls in a direction opposite to the swinging motion provided by the swing mechanism in a geometric ratio determined by the adjusting mechanism.

Although the solution disclosed in EP0431275A2 is workable in itself, needs have now emerged to provide better control of the application. Accordingly, it is an object of the present invention to particularly improve the state of the art by providing a device for separating partial webs 10 so that more versatile driving capabilities of the device can be realized.

The device for separating the partial webs according to the invention comprises a first curved roll fitted on one side of the web and a second curved roll arranged on the opposite side of the web and a mechanism adapted to act on said rolls to change the angles of the partial webs. The device further comprises an adjustment arrangement adapted to vary the distance 20 between the first and second rolls depending on the respective folding angle of the partial webs. The invention is characterized in that the mechanism is a rocking mechanism which is pivotally supported by a pivot point of the pivoting mechanism, and that the support structure of the first roll is pivotally supported by a pivoting mechanism from the first pivot point, and at a distance from the axis of rotation of the first roll and the second pivot point is arranged at a distance from the axis of rotation of the second roll.

4

Preferably, the adjusting arrangement is adapted to increase the distance between the first and second rolls while simultaneously increasing the folding angles of the partial webs. This provides the advantage that even a smaller amount of spreading provides sufficient web coverage on the roll, thereby providing sufficient friction so that there is no slip and no damage to the web surface.

When using the device according to the invention, the longitudinally cut partial webs are guided through the first and second curved rolls so that two successive changes in the direction of web travel are formed in accordance with the folding angles determined by the positions of the rolls. The method modifies the angles of folding to alter the difference in partial webs. Simultaneously with changing the folding angles, the distance between the rollers is changed.

Preferably, the spacing between the rollers is increased as the folding angles are increased and decreased when the folding angles are reduced.

The roll may be an assembly of a plurality of short successive roll segments or a single roll with a flexible jacket.

Other additional features of the invention will be apparent from the appended claims.

The invention provides several advantages. That e.g. reduces or eliminates the need to use a roll, since even a small amount of application has sufficient contact area between the roll and the web to reliably rotate the roll, either guided or assisted by the web. The device according to the invention requires significantly less space than the prior art solutions to operate.

5

In the following, the invention and its operation will be described with reference to the accompanying schematic drawings, in which Fig. 1 schematically shows the known folding spreader principle 5 from below, Fig. 2 schematically shows the known folding spreader principle and its control variables, Fig. shows the apparatus of Figure 3 at various operating positions.

10

Figure 1 shows schematically how the cut partial webs W1, W2 ... Wn-i, Wn arrive at the first application roll 10 in the direction in which the shell 10 of the roll 10 rotates directly in the direction of travel of web W. 10 along the center 15 15 of the longitudinal arc 10 '(Fig. 2) in the direction of rotation of the first roll 10, while each sub-web W1 ... Wn folds outward in its own direction P2 ... Pn as determined by the radius of curvature n and In this way, the gaps between the partial webs V \ ^ ... Wn are opened, causing the partial webs to separate C. Each partial web V \ ^ ... Wn enters the second roll 11 in the direction of rotation of its diaper 20, rotating with the diaper in a new direct direction P. .. Wn are separated from the second spreader roll 11 and there is a necessary difference C between the spacers Wi ... Wn.

Fig. 2 schematically shows the quantities affecting the folding spread applied to the carrier roll cutter 20. In the figure, the web is denoted by the reference numeral W, which passes under the first spreader roll 10 when its arc 10 'spreads the web into partial webs V1 ... ... Wn. The partial webs Wi ... Wn then pass over a second spreader roll 11 whose arc 11 'turns the partial webs W-, ... Wn into its new direction P (Fig. 1). In Figure 2, the curvature radii of the application curves 10 ', 11' are denoted by reference marks 6, r2 and the centers of the curvature radii by reference marks r1c, r2c. The distance between the spreader rolls 10,11 is denoted by the reference L. The bending angles of the track W over the rollers 10,11 are denoted by b1; b2 and the directional angles of the spreader arcs 10 ', 11' to the web W are denoted by g1 and 5 g2. The rolls 10 and 11 are arranged so that the web folds underneath the first roller roll 10, i.e., on the center of the roll curvature radius nc, and above the second roller roll 11, i.e. on the opposite side of the roll curvature radius 2c.

Fig. 3 schematically shows an embodiment of the invention. The embodiment shown in Figure 3 of a device for separating the partial webs W1; W2 .... Wn.1, Wn comprises a first roll 10 and a second roll 11. The rolls or roll casings are curved as shown in Figures 1 and 2. The device includes a mechanism 15, 16, which is adapted to act on said rollers (10,11) to alter the fold angles b1, b2 of the partial webs W1; W2 .... Wn.1, Wn and thereby to achieve the desired separation C for the partial webs Wi, W2 .... Wn-1, Wn. Preferably, the mechanism comprises a rocking mechanism consisting of articulated linkage (s). A power actuator 17 is coupled to the rocking mechanism to effect movement of the rocking mechanism ai-20. The rocking mechanism is rotatably supported from its pivot point 16 to, for example, the body of the device (not shown).

The first roll 10 is provided on the first roll support structure 10.1 and the second roll 11 on the second roll support structure 11.1 and 25, said support structures 10.1, 11.1 being supported by the swivel mechanism 15, 16 on the pivot lever 15. The first roll 10 support structure 10.1 is pivotally supported by the pivot mechanism 15.1, and the support structure of the second roll 11 is pivotally supported on the rocking mechanism from the second pivot point 15.2. The first and second pivot points 30 are on the pivoting lever on opposite sides of the pivot pivot point 16. As can be seen in Figure 7, the first pivot point 15.1 is arranged at a distance from the axis of rotation of the first roll 10.2 and the second pivot point 15.2 is arranged at a distance from the axis of rotation of the second roll 11.2. Thus, as the rocking mechanism moves, the path of the rotation points 15.1, 15.2 of the roll support structures 5 10.1, 11.1 differs from the path of the axes of rotation of the rolls 10.2, 11.2. As described above, the device of the invention provides a control arrangement adapted to vary the distance L between the first 10 and the second roll 11, depending on the respective fold angles b1, b2 of the partial webs. The fields 10.1, 11.1 of the supports 10 of the rolls 10, 11 are coupled to each other in addition to the pivot lever 15 of the rocker structure by a second pivot lever 18 which pivots 18.1, 18.2. are spaced from pivot points 15.1, 15.2 of the first pivot lever 15.

The device further comprises a third pivot lever 20, which at one end is pivotally supported, for example, on the body of the device and at the other end, e.g., on the support structure 11.1 of the second roll. The second articulation lever determines the positions of the parts of the device during movement of the rocking mechanism. Specifically, the third pivot lever 20 causes the roller support structures 10.1, 11.1 to pivot with the pivot arm 15 of the rocker structure and 20 when the first pivot point 15.1 is spaced from the pivot axis 10.2 of the first roll 10 and the second pivot point 15.2 is pivoted the distance L between the roll 11 is increased simultaneously with the folding angles b1, b2 of the partial webs being increased.

25

In practice, the roller support structures comprise a beam which extends across the entire width of the web in a transverse direction of web travel, and the flip mechanism engages the ends of the beam. The device according to the invention requires very little space to operate, especially in the direction of web travel.

30 8

Figure 4 shows the device of Figure 3 in two different positions A (solid line) and B (dashed line). In the figure representation, the webs in different positions A and B start at the same point and extend to the same point as the tangent of the roll. In position A, the fold angles b1A and b2A, 5 are smaller than the fold angles b-m and b2B at position B. Correspondingly, the distance La of the rolls 10 and 11 is shorter in position A than the distance LB of the rolls in position B. This results in the fact that even with small amounts of spreading, the web is covered by rolls 10,11 such that sliding is possible between the web and surface 10. has been minimized.

When the device is operating, the separation of the partial webs is effected by passing the longitudinally sliced partial webs through the first curved roller 10 and the second curved roller 11 so as to produce two successive changes in the web direction according to the folding angles b-ι, b2. When the folding angles (b1A -> b1B; b2A -> b2B) are changed to change the difference C of the partial webs, the distance between the rolls 10, 11 (La -> LB) is changed simultaneously with the folding angles.

The relationship between the change of deflection angles and the spacing of the rolls is such that the distance between the rolls is increased as the deflection angles are increased and reduced as the deflection angles are reduced.

The lengths and pivot points of the pivot levers are selected such that the radius of curvature r-ι of the first roll is substantially perpendicular to the incoming web and the radius of curvature r2 of the second roll is substantially perpendicular to the outgoing web at operating positions.

The device according to the invention is suitable for use in the application of strips of different web materials and in the separation of partial webs.

9

The web material may be plastic film, fabric, paper, sheet metal, cardboard or the like.

It should be noted that only some of the most preferred embodiments of the invention have been described above. Thus, it is to be understood that the invention is not limited to the above embodiments, but can be applied in many ways within the scope defined by the appended claims. The features disclosed in various embodiments may also be used within the scope of the present invention in conjunction with other embodiments 10 and / or combined with other entities than the disclosed features if desired and the technical feasibility of doing so exists.

Claims (6)

Apparatus for separating sub-lanes (W1, W2 ... Wn-1, Wn), which device comprises at least one first bead roll (10) adapted to one side of the web (W) and a second bead roll (11) adapted on the opposite side of the web (W) and a mechanism (15, 16) adapted to actuate said rollers (10, 11) in order to change the breaking angles of the sub-webs (W1, W2 .... Wn-1, Wn) b1, b2) and thus provide a desired separation (C) for the sub-lanes (W1, W2 ... Wn-1, Wn), and the device comprising a control arrangement adapted to change the distance (L) between the first the roll (10) and the second roll (11) depending on the current breaking angle (b1, b2) of the subways, characterized in that the mechanism (15, 16) is a pivot mechanism supported pivotally at the pivot point of the pivot mechanism ( 10) the support structure is pivotally supported against the rocker mechanism at a first pivot point, and that the support structure of the second roller (10) is pivotally supported against the rocker mechanism at a second pivot point, and that the first pivot point is disposed at a distance from the axis of rotation of the first roll and that the second pivot point is disposed at a distance from the axis of rotation of the second roll. 2. Device according to claim 1, characterized in that the control arrangement is arranged to increase the distance (L) between the first roll (10) and the second roll (11) as the increase of the breaking angles of the subways (b1, b2). Device according to claim 1, characterized in that the first pivot point is not between the first roll and its center of curvature (r1 C). 30 Device according to claim 1, characterized in that the second pivot point is between the second roll and its center of curvature (r2C). Apparatus according to claim 1, characterized in that the mechanism comprises an arrangement for correcting the angular angle (g1, g2) to correspond to all respective values of the breaking angle (b1, b2), such that the mechanism is adapted to pivot said rollers (10, 11). in relation to the mechanism in an opposite direction with respect to the pivotal movement as it results in a geometric relationship determined by the mechanism (15, 16, 17). Device according to claim 1, characterized in that the control arrangement (12, 13) is made of angular levers.