The present invention relates to a method for feeding out the primary web of a mineral wool web by means of a pendulum conveyo and to an arrangement of such a pendulum conveyor according to preamble of claims 1 and 5.

When making mineral wool webs by using a pendulum conveyor for the output, the aim is to achieve a thin primary web, yielding a homogeneous end product. The primary web being thin, the outpu speed has to be high, 200 m/min or more, in order to obtain the desired capacity.

A thin primary web is ry plastic, and to prevent its hovering out of control during the output at a high rate, thus causing uneven edges, one tries to carry out the output as close to the receiving conveyor as possible, at least over a major part of it width. Thus, each layer of the primary web is allowed to lay dow and adhere to the preceding layer before feeding the following layer on top. A problem always arising in this situation is that of the pendulum tending to sweep back the previously fed layer o the primary web during the reverse motion. This problem is inc¬ reased by the fact that the end rollers, the conducting rollers the pendulum conveyors, always rotate outwards for the output of the primary web. This means that the conducting roller preceding in the direction of motion rotates in the same direction as the pendulum motion, tending to lift the layer fed out during the previous pendulum swing, thus hampering the forming of even edge and a flat layer. The second conducting roller, i.e. the subse¬ quent one in the direction of motion, rotates in a direction op¬ posite to the pendulum motion, having however the same direction of rotation as the output motion of the primary web and tending

advance the depositing of the Tayer being fed out.

The purpose of the present invention is to reduce the negative consequences and to increase the positive consequences of the ef¬ fect of conducting rollers on the fixing of the fed out layer to the underlying layer.

This has been achieved by characterizing the output method and the arrangement of the pendulum conveyor as defined in claims 1 and 5.

Thus, the pendulum conveyor has been made shears-like movable, the facing conveyors being displaced vertically with regard to each other for each pendulum swing, so that the pendulum con¬ veyor preceding in the direction of motion is situated higher tha the subsequent pendulum conveyor. Thus the lower conducting rolle of the preceding pendulum conveyor is situated further away from the receiving conveyor than the conducting roller of the subse¬ quent pendulum conveyor. By this arrangement, the conducting rol¬ ler rotating in the same direction as the pendulum and having tended to lift the layer fed out during the previous pendulum swing is separated from the receiving conveyor and does not in¬ fluence the underlying layer as easily. At the same time the se¬ cond, subsequent conducting roller, towards which the output of the primary web is directed, and which has the same direction of motion as the primary web, is situated closer to the receiving conveyor and advances the pressing and fixing of the web onto the receiving conveyor.

In this manner, a more rapid fixing of the fed out layers is ac¬ hieved, and consequently also a better controlled loop or edge forming.

The reversing of the mutual height position of the pendulum conveyors preferably is synchronous with the pendulum motion, taking place when the conveyors is in either of the end positions

The reversing is preferably done mechanically by connecting to the connecting rod that drives the pendulum conveyor. The rever sing may also be hydraulically or pneumatically performed under the effect of an impulse from e.g. a limit switch valve.

The pendulum conveyors are preferably connected to each other a to a reversing mechanism which in the end positions of the pendu lum motion actuates the reversing of the height position of the two pendulum conveyors with regard to each other. The reversing mechanism may be a hydraulic or pneumatic cylinder which by an impulse actuates the connection of the pendulum conveyor. The conveyors are preferably interconnected by a mechanical arm syst forming a parallelogram together with the conveyors. The paralle logram may be connected to the connecting rod driving the pendulum conveyor. In this case, the reversing is continuous du¬ ring the entire pendulum swing and reaches its maximum at the mi point of the pendulum. In the end positions both pendulums are essentially at the same height.

The invention is described below with reference to the enclosed figures illustrating two preferable embodiments of the arran¬ gement according to the invention and in which

figure 1 represents a lateral view of an arrangement according t the invention, the pendulum conveyor being at the mid point and two side positions indicated with dotted lines and

figure 2 shows a modification of the arrangement according to fi gure 1 but illustrated in the same manner.

Corresponding parts have been marked with the same reference nu¬ merals in the figures.

The pendulum conveyor has been generally marked with 1, the pri¬ mary web with 2, the left-hand conveyor with 3. and the right- hand conveyor with 4, the lower left-hand conducting roller with

5 and the lower rigth-hand conducting roller with 6, the recei¬ ving conveyor with 7, the driving connecting rod with 8 and its driving wheels with 9, the arms joining the two conveyors of the pendulum conveyor with 10. In figure 1 the hydraulic or pneu¬ matic cylinder carrying out the reversal is marked with 11 and in figure 2 the arm carrying out the reversal is marked with 12. The receiving conveyor is marked with 13.

In figure 1, the primary web 2 is fed out from a horizontal con¬ veyor into the gap between the two conveyors 3 and 4 of the pen¬ dulum conveyor. The conveyors 3 and 4 are driven by the rollers at the ends of the conveyors, the lower rollers, i.e. the so- called conducting rollers having been marked with 5 and 6. In the figure, the pendulum conveyor 1 drawn with full lines moves to th left and consequently the left-hand conveyor 3 with its conductin roller 5 is in a raised position. At the output end the primary web follows the right-hand conducting roller 6 and is deposited, owing to the position of this, close to the receiving conveyor. Simultaneously, the rotation of the conducting roller 6 in the same direction as the output of the primary web advances the press-ing and fixing of the primary web onto the underlying layer. When the pendulum conveyor reaches the left-hand end position, th cylinder 11 is actuated to influence the height position of the conveyors 3 and 4 with regard to each other. One end of the cy¬ linder 10 is connected to a stand for the pendulum conveyor and the other end is connected to the upper one of two arms 10 joinin the conveyors like a parallelogram. At the end position of the pendulum swing a valve is influenced, not shown in the figure, whereby the cylinder is actuated to pull the upper arm 10 upwards whereby the conveyor 4 rises , while the conveyor 3 sinks. In the right-hand end position of the pendulum conveyor, the opposite movement takes place, whereby the right-hand conveyor sinks and the left-hand conveyor rises. The figure illustrates how the pri¬ mary web is fed out under control onto the receiving conveyor 13 and how it is fixed onto the underlying layer.

Figure 2 illustrates the same arrangement as in figure 1, howev with the difference that the conveyors, which are joined by the arms 10, are connected to the driving connecting rod 8 through a arm 10, of which one end is connected to the upper arm 10 and th other end is connected to the connecting rod. The rising and sin king of the connecting rod is transmitted through the arm 12 to the conveyor parallelogram. During the clockwise rotation of the driving wheel and the displacement of the pendulum conveyor from the extreme right-hand position II towards the central position the left-hand conveyor is continuously lifted and reaches maxima height in the central position. During the continued motion to¬ wards the left-hand extreme position the arm 10 gradually lifts the right-hand conveyor upwards and lowers the left-hand conveyo equally. In the left-hand extreme position as in the the right- hand extreme position the conveyors will thus be at approximatel the same height. The maximal difference of height s is always reached in the central position. Thus the purpose of the inven¬ tion is reached, i.e. that the conducting roller pressing down¬ wards is closest to the receiving conveyor and that the lifting conducting roller is at the maximal distance from this at the pendulum stage at which the pendulum conveyor moves closest to the receiving conveyor. Due to the fact that the output end in the extreme positions and in the vicinity of these are further away from the receiving conveyor, the mutual height position of the conducting rollers do not have the same importance for the fixing of the primary web onto the support.

In this embodiment, the conveyors are continuously displaced wit regard to each other, however the real reversing of the mutual height position of the conveyors takes place in the end position On the contrary, in the preceding embodiment, the reversing take momentarily place in the end positions, whereby the height posi¬ tion is kept unchanged during the entire pendulum swing.

With reference to the above facts it is conceivable to carry out the reversing somewhat before the end position or somewhat after the end position in the cases in which the pendulum conveyor unde the effect of the oscillating motion rises from the receiving conveyor at the end of the pendulum swing, without reducing the inventive step.

The reversing of the conveyors can be accomplished in many diffe¬ rent ways, which are easily constructed and adapted to the cir¬ cumstances by a person skilled in the art.