FI82101B - Device for controlling and severing the threading strip of a paper or cardboard web - Google Patents

Abstract

Device for controlling and severing the threading strip R of a paper or cardboard web. The device comprises blowpipes 31, 33, blowings F1, F2 being led from nozzle orifices 35 in connection with the blowpipes, the first blowing F1 guiding the threading strip in a first direction with the aid of a guide sheave 32 and the second blowing F2 guiding the threading strip R essentially in its feed direction with a second guide sheave 34. With the blowings F1, F2 directed in opposition the threading strip is tensioned in connection with the guide device 30 (fig. 4C). The device comprises a severing blade 20, with is provided with cutting end 21. The said blade 30 is controlled in connection with the device control plane (T-T) with a single stroke of the blade 20 in order to sever the threading strip R whilst it is tensioned in connection with the device through the action of the said blowings F1, F2. The cut- off end of the threading strip R is guided or falls into a pulper, broke conveyor or the like situated below, and the end R3 of the threading strip that is to be guided continues its run. <IMAGE>

Description

82101

Apparatus for guiding and cutting the headband of a paper or paperboard web Anordning för styrning och avbrytning av 5 spetsdragningsbandet av en pappers- eller kartonbana

The invention relates to an apparatus for guiding and cutting a paper or board web headband, the apparatus comprising blow tubes 10 from which nozzle slots are blown, from which a first blow the headband is guided in the first direction by a guide plate and by a second blow the headband by blowing in opposite directions, the headband 15 is tightened in connection with the control device, and which device comprises a cutting blade guided in connection with the control plane of the device by a single stroke of the blade to cut the headband.

The device according to the invention is intended for use at such points in the paper-breaking machine where the heading of the web is performed by cutting a narrow (about 150 ... 500 mm) strip from the edge of the full-width web, which is guided forward by means of compressed air jets. These points are, for example, the transfer of the web from the press section to the drying section, from the last drying cylinder to the machine calender or from the lower roll of the calendar to the paper winding device.

In the past, the problem at these points has been that when the strip cut in the above-described manner is first allowed to "drain" into the so-called waste paper handling device below the machine. to the pulper and then when this strip is sent by means of compressed air jets to guide forward, e.g. to the first groove of the calender or to the groove between the pop cylinder and the ingot iron, a strip already going into the pulper rises, which considerably slows down the head drive. A disadvantage in this connection is also that the paper arrives at the next 35 nips in double "rolling" over the folding point, which slows down the progress and in turn makes it substantially more difficult to obtain the tape between the rolls.

2 82101

It has been known from the above that the above-mentioned drawbacks have been avoided by constructing various mechanical conveyors to transfer the edge strip in question, e.g. from the drying cylinder, to the calender. These known solutions become quite expensive compared to air jet control, 5 however, the double entry of the paper strip into the next nip cannot be prevented.

With regard to the state of the art most closely related to the invention, reference is made to Applicant's FI patent 62,695 (corresponding U.S. Pat. No. 4,501,643), which discloses an edge cutting and control device for a web-cut edge strip consisting of nozzles connected to a compressed air source. nozzle openings arranged in said nozzles and edge band guide plates, the nozzle openings or slots of the first nozzle being directed to blow air jets in the direction of the first guide plate and the nozzle openings of the second nozzle being adapted to blow air jets in the direction of the second guide plate. Em. In the FI patent it is considered new that said guide plate planes are arranged at a certain angle to each other so that the direction of the first guide plate corresponds to the direction of further cutting of the cut end of the edge strip and the direction of the second guide plate corresponds to the edge strip pulper or the baffles are arranged by means of air jets arranged in connection therewith to act as guide and air conveying surfaces so that when said air jets pull the edge strip in opposite directions in the area of the guide plates the edge strip breaks

With regard to the state of the art related to the present invention, reference is also made to FI publication 74 315 (Oy Tampella Ab). A scissor-like cutting device is previously known from this publication, in which it is considered new that the cutting device comprises at least one sharp means adapted to move in a plane substantially parallel to the plane of the head plate from the front of the head plate to its front edge and cut

II

3 82101 on the side away from the front edge of the plate and to guide the edge strip further onto the headland plate.

The object of the present invention is to further develop previously known mechanical cutting devices and to eliminate the drawbacks observed in them in practice.

It is a particular object of the invention to further develop the edge band cutting and control device disclosed in the applicant's above-mentioned FI patent 62,695.

10

It is a particular object of the invention to provide such a cutting device which also safely and efficiently cuts a thick web, e.g. a paperboard web, having a basis weight of more than 150 g / m 2. It has not been possible to cut the thick stakes using the previously known-15 and (FI patent 62,695) cutting blows.

The object of the invention is to provide a cutting and control device which cuts the headband when it is tightened by the action of guide blows, whereby the cutting can be performed reliably and quickly.

It is a further object of the invention to provide such a headband cutting and control device which can be arranged to be automatically controlled by a so-called with push-button control equipment without the need for manual operations on head-25 exports.

In order to achieve the above and later objects, the invention is mainly characterized in that the cutting blade has a sharp spike-shaped cutting tip as a cutting head, which is adapted to cut the head to the conveyor or the like and the head of the headband still guided continues to run.

:. 35 and 82101

In the following, the invention will be described in detail with reference to some application examples of the invention shown in the figures of the accompanying drawing, to the details of which the invention is in no way narrowly limited.

5

Figure 1 shows a headband control apparatus arranged in connection with a central roll or a calender roll of a press section of a paper machine, to which a cutting apparatus according to the present invention can be connected.

Figure 2 shows a combined control and cutting device according to the invention arranged in connection with a central roll or a calender roll of a press. Figure 2 is at the same time point D in Figure 1.

Figure 3 is a schematic top view of the device of Figure 1.

Figures 4A, 4B and 4C show the different stages of operation of the control and switching device according to Figures 2 and 3.

Figure 5 shows a machine direction partial section of a control and cutting device according to the invention.

Figure 6 shows the same as Figure 6 seen from above.

Fig. 7 schematically shows another control and cutting device according to the invention in a machine direction section.

Figure 8 shows the same as Figure 7 seen from above.

Fig. 9 shows a horizontal section IX-IX in Fig. 7.

Fig. 10 shows a vertical cross-section X-X in Fig. 8.

Figure 1 shows, for the most part, a previously known web head guide device 35 arranged in connection with a central roll 10 or a similar calender roll provided with a smooth surface 10 'of a press section of a paper machine.

Il 5 82101

In connection with the air blowing control device shown in Fig. 1, the cutting device according to the present invention is applied so as to obtain an efficient and reliable combined control and cutting device. The position of the central roll 10 of the press shown in Fig. 1 may be, for example, a calender roll, a roll of a coating machine or other similar roll of a paper finishing device, so the invention is not limited to the press section of a paper machine.

According to Fig. 1, the normal movement of the web WD is controlled by a guide roller 13, after which the web W0 is guided to the drying section of the paper machine, generally to its first drying wire. As is known, when the end of the track is removed, a narrow headband about 150-500 mm wide is cut, which is controlled by control devices according to the invention, of which Figure 1 shows a control device 30 near the central roll 10, then guide plates 37 and 38. Party A in its inoperative lower position 30 'in which it does not interfere with the operation of other devices.

Figure 1 shows a scraper 11, the blade 12 of which removes the headband R and leads to a pulper below it (not shown). The head drive device 30 has a first baffle plate 32 and a second baffle plate 34 which are substantially perpendicular to each other. The extension of the second guide plate 34 is a guide plate 36, the distance of which from the guide roller 25 13 at S2 is at least S2 to 150 mm. The distance S of the first guide plate 32 from the smooth surface 10 'of the roll 10 is at least Sx - 25-35 mm. The headband control apparatus described above in connection with Figure 1 is largely known from the applicant's above-mentioned FI patent 62,695, to which reference is made to other details of structure and operation.

30

The main features of a preferred embodiment of the control and switching device according to the invention will now be described with reference to Figures 2 and 3. The control device 30 comprises two nozzle tubes 31 and 33, between which there is a space 24 for a cutting blade 20. In connection with the first nozzle tube 35, there is a first baffle plate 32, through which a first nozzle 6 is blown from the first nozzle tube 31 82101.

Fx along nozzle plate 32. Correspondingly, in connection with the second nozzle tube 33 there is a second guide plate 34 to which a second blow F2 is blown from the nozzle slot 35 of the nozzle tube 33. The nozzle tube roll 10 side walls define a guide plane TT with a first guide plate 32 in parallel extension. 40 attached to the device 30 via support members 42. The nozzle tubes 40 have nozzle parts 41 directed towards each other, through which directional blows the head-export strip R can be detached from the surface 10 'of the roll 10.

10

The operation and other main features of the structure described above will become apparent from the following description with reference to the operating sequences shown in Figures 4A, 4B and 4C. At the start of the headband, the headband R is detached from the surface 10 'of the roller 10 by the blade 12 of the scraper 11 (Fig. 1) 15 and held away from the nozzles 31 by blown air jets, the headband Rx is transported to the pulper below in this control. Thereafter, at the beginning of the blow to be applied from the nozzles 31 20 to the second guide plate 34, an air jet F2 to be blown is provided on the strip R with a knee R2 according to Fig. 4B. Thereafter, the headband R and its bag portion R3 are caused to engage the control of the vacuum field of the second guide plate 34 by the action of the blows F2 as shown in Fig. 4C.

25

In the prior art devices, the thinner paper web is generally broken in the step shown in Fig. 4 by the tightening effect of the blows F2 and F2 alone, which, however, is not always possible without problems when using thicker e.g. cardboard webs. Therefore, the device 30 30 is provided with a cutting device according to the invention, comprising a cutting blade 20 with a sharpened spike-like cutting head 21. The blade 20 is arranged to be pivoted about an vertical axis 22 by an actuator 23 to provide its cutting movement.

The cutting movement of the blade 20 starts from the transverse position 20 'and as the blade accelerates its cutting head 21 emerges outside the plane TT through the space 24 between the tubes 31 and 33, cutting the main export strip R so that its downwardly hanging end R * falls into the pulper below and the bag part R3 straightens and the end of the strip R is guided by the guide plate 34 shown in Fig. 1 of the device 30 and further under the control of the blowers F3 to the guide plate 37, in connection with which blows corresponding to the blowing F2 can also be used. Thereafter, the head-export strip is guided along the guide plates 37 and after them, guided by the blows Fk, to the lower surface of the other guide plates 38 and from there on, for example, to the gap between the head guide ropes (not shown). Once the passage of the headband R 10 has been stabilized, the device 30 is turned by the actuator 37 to the neutral position 30 '(Fig. 1).

In the following, with reference to Figs. 5 and 6, the embodiment of the invention which the applicant currently considers to be the most advantageous because it provides a very fast cutting movement will be described. The cutting device comprises a rod-like blade 20 fixed to the shaft 22 by a fastening member 27. The cutting device is located below the first guide plate 34 on the necessary frame structures. The cutting device comprises an air torque motor 23 to which compressed air is supplied via connections 26.

The air motor 23 is double-acting so that after the blade 20 has moved from the cutting position 20 'to the position 20 ", the next blade cutting movement can be effected without a return movement. in the region L exceeding the width 25 of the edge band R and in the sector a of movement of the blade 20, the blade comes outside the plane TT, cutting the headband R. If we consider the cutting event from position 20 ' from the control unit 50 of the motor 23 shown, a pulse of operation, in which compressed air is introduced into the space limited by the piston of the air torque motor 23, accelerates the movement of the blade 20 and rapidly. In the sector of movement of the blade 20, the movement is slowed and the blade 20 impinges on the cushion-35 28 stopping at a position 20 "from which it is ready to perform 8 82101 new cutting movements without return when compressed air is supplied to the second air torque motor 23 connection 26.

The movement of the spike-like blade 20,21 according to the invention can also be realized by an air torque motor 23 other than that described in connection with Figures 5 and 6. Figures 7, 8, 9 and 10 show an embodiment of the invention in which the movement of the blade 20 is rectilinear and with a linear motor 48. According to Figures 7-10, a guide tube 43 is attached to the space 24 between the nozzle tubes 31 and 33.

On the side of the guide tube 43, a groove 44 opens into the space 24. Inside the guide tube 43, a guide part 45 moves, to which is attached a blade 20 with a sharpest cutting edge end 21 with a spike-like tip. The guide part 45 is connected to the piston rod 46 of a linear cylinder 48, e.g. an air cylinder. Compressed air is supplied to the air cylinder 48 together via a control unit 50. The air cylinder 48 is either double-acting, in which case the return movement of the blade also cuts the edge band R. The air cylinder 48 can also be single-acting, so that the return movement is effected, e.g., by spring action. Both ends of the guide tube 43 have damping portions 45 which dampen and stop the movement of the blade.

The cutting can also be arranged so that the air is supplied from the compressed air network directly inside the guide tube 43, whereby the guide part 45 quickly pushes the blade 20 to the other edge in the guide tube 43. The cutting movement in the second direction takes place in the same way. The device shown in Figures 7-10 is best suited for slower machines.

25

A variety of mechanical actuators other than those described above for effecting the cutting motion of the blade 20 are also possible. The steel has an end with a cutting edge with a sharp spike-like also cutting tip. The movement of the blade 20 is rapid and percussive, so that even the thickest edge band R of the 30 can be quickly cut off. For this purpose, the movement of the blade 20 may include acceleration and deceleration steps (sectors aD and ax in Figure 6). The blade 20 shown in the figures cuts the formation of the web on the side opposite to the wire if the web is made with a flat wire.

35 11.

9 82101

The following are claims within the scope of which the details of the invention may vary and differ from those set forth above by way of example only.

Claims (9)

10 821 01 An apparatus for controlling and cutting a headband (R) of a paper or board web, the apparatus comprising blow tubes (31, 33), from the associated nozzle slots (35) of which blows (F1, F2) are led, of which a first blow (F1) of the headband is guided in the first direction by means of a guide plate (32) and by a second blow (F2) the headland (R) is guided in its main direction of travel by a second guide plate (34) and (FIG. 4C), which device comprises a cutting blade (20) guided in connection with the guide plane (TT) of the device by a single stroke of the blade (20) to cut the headband (R), characterized in that the cutting blade has a sharp prong a cutting tip adapted to cut the headband (R) under the action of said blows (F1, F2) l tensioned in connection with the device so that the cut-off end of the headband (R) is guided or dropped into the pulper, scrap conveyor or the like below, and the further guide end (Rj) of the headband continues to run. 20 Device according to claim 1, characterized in that the device is arranged to operate in connection with a space (24) between two adjacent blow nozzles (35) with nozzles (35). Device according to Claim 1 or 2, characterized in that the cutting blade (20) of the device, which is preferably rod-shaped, is arranged by a torsion motor (23) to rotate about an axis (22) perpendicular to the cutting plane so that the cutting blade (20) has an acceleration stage ), during which its movement is accelerated to the required cutting speed 30, followed by the actual cutting step (a), in which the cutting head (21) cutting the cutting blade (20) is outside the guide plane (TT) of the headband (R) in the device. a deceleration step (a,) of the blade (20) is provided (Figures 5 and 6). 35 II 11 82101 Device according to Claim 3, characterized in that a double-acting air torsion motor (23) is used as the motor of the device, so that the cutting blade (20) of the device cuts the edge band (R) without return movement. 5 Device according to Claim 3 or 4, characterized in that the fastening part of the cutting blade (20) of the device and the torsion motor (23) are arranged below the second guide plate (32). Device according to one of Claims 3 to 5, characterized in that the elongate rod-shaped cutting blade (20) of the device has a flexible stopping stop (28) at the end of its movement sector, preferably at both ends. Device according to claim 1 or 2, characterized in that the cutting blade (20) of the device is arranged to perform a linear cutting stroke over the entire width of the headband (R) (Figures 7-10). Device according to Claim 7, characterized in that. In connection with the space (24) between the adjacent nozzle tubes (31, 33) of the device 20, a guide part (43) is arranged, in connection with which an opening (44) opens into said space (24) so that inside said guide part (43) there is a guide piece (45). ) to which is attached a cutting blade (24) with a sharp cutting head (21) extending through said opening 25 (44) and space (24) outside the guide plane (TT) of the device (30), and that said guide piece (45) is connected to a motor (48), which is preferably a double-acting linear motor (Figures 7-10). Device according to one of Claims 1 to 8, characterized in that the operation of the device is controlled automatically by control pulses available from the automatic feeder of the paper machine or the paper finishing machine. i2 821 01