FI123046B - A method and apparatus for introducing a threading strap from a first processing apparatus to a second processing apparatus - Google Patents

Description

METHOD AND EQUIPMENT FOR DELIVERING MAIN TAPE FROM FIRST PROCESSING EQUIPMENT TO SECOND PROCESSING EQUIPMENT

Field of the Invention 5

The present invention relates to a method and apparatus for transferring a pulp-based web from a first processing apparatus to a second processing apparatus. In particular, the invention relates to a method for the controlled transfer of a thread-cut strap from a first processing apparatus to a second processing apparatus.

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State of the art

When forming a pulp web, it is processed at several different stages in several different installations. Typically, the web formed from the pulp is pressed out of liquid in one of the apparatuses, after which the web is transferred to another apparatus where it is further dried, for example, by hot air.

Whenever this process is started from the beginning, for example after maintenance operations or a malfunction in the process, the web must be guided from the press section to the drying section and further through the entire drying section.

Conventionally, this has been accomplished by cutting, for example, with a water jet, a thin strip of web in the direction of travel. This strip is led to pass near the threading strap where it is cut off. The ribbed end of the strip from the press section, i.e. the threading strip, is fed to the threading strap which passes through the drying section adjacent the web running through the web. Feeding of the truncated end of the threading tape is often accomplished in conjunction with the cp cut by giving the cut a pulse either with the cutter blades or

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x with compressed air, for example. The threading strap is often provided with one or more press wheels or straps forming a nip with the threading strap at the point where the end of the strap strap is brought to the threading strap.

m δ 00 When the tail strap is placed on the head strap, it is conventionally folded after the press wheel or strap twice so that the head strap is caught between the folded tail strap. This arrangement ensures that the threading strap stays with the threading strap throughout the drying section. After the threading strap has traveled a sufficiently long distance in the drying section, the threading strap is gradually widened by moving in the widthwise direction of the web where the threading strap is cut until the threading strap is wide.

5 Traditionally, the truncated end of the headband is guided to the headband by hand. In addition, there is a retarder for introducing the threading strap manually into the strap strap as there is a safety risk when the user of the equipment has to work near moving machine parts.

10 Various apparatuses have therefore been developed for introducing the strap to the strap. One such apparatus is disclosed, for example, in WO 2007/108738. The problem with these installations has been to provide a reliable and controlled export of the strap to the strap. Particularly problematic has been the control of the strap passage when it is cut off and immediately thereafter inserted into the nipple between the strap and the presser pulley or strap with the cut end of the strap.

Further, WO 99/27184 discloses an apparatus for transferring a threading strap from a first processing apparatus to a second. WO 99/39049, for its part, discloses devices 20 in which the strap is transferred to the strap by means of a gripping device. The above problems are also related to the operation of such equipment.

Functions and Summary of the Invention

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g 25 It is an object of the present invention to solve the problem of

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qq., and provide an improved method and apparatus for doing so. In the solution according to the invention, this is accomplished by causing the cuff head to pass between the transfer roller and the press wheel during compression, at least while the cc head strap is cut and its cut end is pressed between the head strap o φ 30 and the press wheel.

in δ ^ With the headband compressed during surgery, a steady and controlled passage of the headband is guaranteed despite the operation and subsequent impulses leading to the cutting head being guided.

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BRIEF DESCRIPTION OF THE DRAWING

Embodiments of the invention will now be described in more detail with reference to the accompanying drawings, in which;

Fig. 1 is a perspective view showing an apparatus according to an embodiment of the invention at various stages of its operation; Fig. 2 is a perspective view showing an apparatus according to another embodiment of the invention at various stages of its operation;

3 is a perspective view of a second angle view of the embodiment of FIG.

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In Fig. 1, an apparatus according to an embodiment of the invention is in a state where the threading strap 1 from the first processing apparatus (not shown) and its severed end Γ are caused to pass through the strap 7. In addition, reference numeral 12 indicates the position of dashed transfer roller 2 and For the sake of clarity, only a portion of the headband is shown. The threading strap extends between the transfer roller 2 and the press wheel 8 and further between the press wheel 8 and the drive belt 7. Reference numeral 3 represents a cutting device for cutting the threading strap against the cutting blade 9. The transfer roller 2 and the cutting device 3 are attached to the transfer carriage 4 which moves along the transfer rail 5. It should be noted that, for the sake of clarity, the transfer rail 5 is shown shorter than what it could actually be. The transfer rail 5 is secured to a suitable support structure (not shown) by a bracket 6. The threading strap 7 is pivoted to travel cp back into its upstream direction by means of a pivoting gear 10. c \ j

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Fig. 2 shows an apparatus according to another embodiment of the invention in a state where the threading strap 1 passes over the transfer roller 2 and the threading strap is displaced with respect to its angular direction to pass in line with the threading strap 7. In addition, the reference numeral 11 denotes the position of the dotted transfer roller 2 and the cutting device 3 where it receives the headband as it exits the first processing apparatus and prior to lateral displacement of the headband. Reference numeral 13 denotes the position of the transfer roll 2 and the cutting device 3 drawn in dashed lines when the threading strap is pressed between the transfer roll 2 and the press wheel 8.

Fig. 2 also shows the actuator 2 'rotating the transfer roller, the actuator 3' causing the cut-off motion of the cutting device 5, the actuator 4 'causing lateral movement of the transfer roller 2 and the cutting device 3, and the actuator 5'.

Figure 3 shows the apparatus of Figure 2 in a state where the cut end kaistu of the threading strap is placed on the threading strap 7.

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DETAILED DESCRIPTION OF THE INVENTION

In the apparatus according to the embodiment shown in Figures 2 and 3 of the invention, the end of the first processing apparatus 5 of the transfer rail 5 is disposed such that a web-cut head 1 coming from the first processing apparatus passes between the transfer roller 2 and the second processing apparatus. Further, the end of the first processing apparatus of the transfer rail 5 is disposed such that the transfer roll 2 is located at that end in the width direction of the web at the threading strip. The end of the second processing apparatus on the transfer rail 5 is in turn disposed so that, when driving the transfer carriage 4 towards said end, the transfer roll 2 is pressed against the press wheel 8.

Alternatively, the end of the second processing apparatus on the transfer rail 5 may also be positioned such that when moving the transfer carriage 4 towards said end, the transfer roll 2 is pressed into contact with another wheel located near the press wheel 8.

c \ j q 25 The transport carriage 4 is arranged on the transfer rail 5 movably parallel to the transfer rail. The position of the transfer rate 4 on the transfer rail may be controlled by an actuator 5 'which may be, for example, a hydraulic or pneumatic cylinder, a piston rodless cylinder, a linear motor, a linear conductor with ball screw mechanism or belt drive. to achieve linear motion. The transport rail 5, in turn, is fastened with a bracket o0 ^ 30 6, for example, to a frame or a separate support structure of one of the processing apparatuses. Alternatively, the transport rail 5 may be mounted removably and provided with an actuator 00

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The transfer roll 2 is rotatably connected to the transfer carriage 4. To effect the rotation movement of the transfer roll 2, the transfer roll may also be connected to a motor 2 'which may be, for example, a hydraulic, pneumatic or electric motor to obtain the desired rotational speed of the transfer roll.

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The trolley 4 is also provided with a cutting device 3 which cooperates with a cutting blade 9 located in the vicinity of the press wheel 8 and the threading belt 7. The cutting device 3 comprises a movable ram by means of which it can be severed by pressing it against the blade 9. The press of the cutting device may move further past the blade 9 and feed the cut-off head 1 'of the threading strap 10 between the threading strap 7 and the press wheel 8. Movement of the ram is achieved by an actuator 3 'which may be, for example, a hydraulic or pneumatic cylinder, a solenoid, or other known actuator for achieving such a movement. Preferably, the cutting device 3 comprises at least one nozzle with which, after cutting off, the cut end 1 'of the threading strap can be guided by compressed air towards the nip between the threading strap 7 and the press wheel 15 8. This at least one nozzle may be provided, for example, in a movable ram.

The transfer roller 2 is preferably provided with flanges at its ends to ensure that the threading strap remains on the transfer roller as it moves with the transfer carriage 4 along the transfer rail 20 5. In this case, the distance between the flanges must be greater than the width of the presser wheel (8).

In an apparatus according to another embodiment of the invention, the transfer carriage 4 may be provided with an actuator 4 'for moving the transfer roller 2 and the cutting device 3 substantially laterally with respect to the longitudinal direction of the transfer rail 5, as shown in FIG. The actuator 4 may be, for example, a hydraulic or pneumatic cylinder of a piston rod, a linear guide with a ball screw or belt drive, or other known actuator for the desired movement, or O) C 1x It will be apparent to those skilled in the art that moving parts and actuators m δ 00 In the method of the invention, the transfer carriage 4 is initially driven to the first processing equipment end of the transfer rail 5 when starting the processing equipment according to the position shown in FIG. 1 or 2. After the web arriving from the first processing unit 6 is formed so that it can be transferred to the second processing unit, the threading tape 1 is cut from the web according to the prior art. As previously described, when the transfer carriage 4 is in its current position, the transfer roller 2 is located between the first treatment apparatus and the leading thread 1 therefrom, in other words the threading belt is located between the transfer roller 2 and the second processing apparatus. Furthermore, the transfer roll 2 is located at said end in the width direction of the web at the threading strip 1.

As the transfer carriage 4 is driven towards the end of the second treatment apparatus on the transfer rail 5, the transfer roll 2 picks up the threading strip 1 and moves the path traveled by it closer to the second treatment apparatus. The transfer carriage 4 is driven towards the other end of the transfer rail processing unit until the transfer roller 2 is pressed against the press wheel 8, leaving the threading strap 1 in the nip between them, thereby calming the malfunctions of the strapping strap. As a result of the above-described operations, the web 15 passing through the tensioning strap 1 has moved to run in the vicinity of the tapping strap 7 and the press wheel 8, for example as shown in Figures 1 and 2.

Preferably, when the threading strap 1 is in contact with the transfer roller 2, the moving strap can be rotated by means of an actuator 2 ', thereby aiding the passage of the threading strap over the transfer roll 20. For example, when the transfer money 2 is rotated during the movement of the transfer carriage 4, the circumferential speed of the transfer roller may be equal to or greater than the web speed traveled by the headband. When the transfer money 2 encounters the press wheel 8, the peripheral speed of the transfer money should be substantially the same as the web speed traveled by the headband.

c \ j q 25 Next, cut the strap by pressing it against the blade 9 with the c \ j £ button on the cutting device 3. The severed end 1 'of the threading strap 1 is further pressed past the blade towards the point where the press wheel 8 and the threading strap 7 meet. Simultaneously, the cutting device 3

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The air from the nozzles can be blown to ensure that the truncated head 1 'is guided into the nip between the presser wheel 8 and the threading belt 7. oo fc 30 m II The press wheel 8 presses the severed end 1 'of the threading strap against the threading strap 7, which further transports the threading strap through the second processing apparatus.

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In a method according to another embodiment of the invention, the lateral displacement of the threading strap 1 with the threading strap 7 is effected by moving the transfer roller 2 and the cutting device 3 by means of an actuator 4 'during or before the moving carriage 4. This may be particularly advantageous in applying the invention to an existing concept apparatus wherein the threading apparatus itself is mounted adjacent to the web traveled by the web. For example, the lateral displacement is effected between the locations indicated by reference numerals 11 and 12 in FIG

It will be apparent to one skilled in the art that the apparatus and method of the invention may also be applied to deliver a strap from a first processing apparatus to a second processing apparatus provided with a conveyor for transporting the strap through the second processing apparatus.

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Claims (5)

A method for guiding a feed tip (1) cut from a cellulose web from a first treatment plant to a second treatment plant, wherein the second treatment plant comprises at least one pressure wheel (8) or belt pressed against a tip pulling belt (7), in which method : - the feeding tip (1) is moved from the first treatment plant to the proximity of the second treatment plant's tip drawing belt (7) and pressure wheel (8), 10. the feeding tip (1) is cut and the cut end (Γ) is introduced between the tip drawing belt ( 7) and the pressure wheel (8) for guiding the feed tip to the tip pull belt (7), characterized in that the feed tip (1) is caused to run in pressure between a transfer roller (2) and the pressure wheel (8) at least during the time when the feeding tip cut and its cut end (Γ) is pressurized between the tip pull belt (7) and the pressure wheel (8). A method according to claim 1, characterized in that the forward tip (1) is moved laterally in relation to the direction of movement before the forward tip 20 is brought into pressure between the transfer roller (2) and the pressure wheel (8). 3. Device for guiding a feed tip (1) cut from a cellulosic web from a first treatment plant to a second treatment plant, said second treatment plant having a tip pull strap (7) and a pressing wheel (8) or belt against the pressing cage. the device comprising: c - a movable cp transfer roller (2) arranged between the first and the second treatment plant to move the feeding tip (1) from the first treatment CVJ x treatment plant to the vicinity of the second treatment plant's tip cc strap ( 7) and thrust wheels (8), co 30. characterized in that the transfer roller (2) is arranged to move against the thrust wheel (8) in order to keep the feed tip (1) in the press from the cutting stage (1) cutting stage at least until the cut end (F) of the feed tip is in pressure between the tip pull belt (7) and the pressure wheel (8). 11 4. Device according to claim 3, characterized in that the transfer roller (2) is provided at its ends with flanges. Device according to any of claims 3-4, characterized in that the transfer roller (2) is provided with actuating means (4 ') for effecting a lateral movement relative to the direction of movement of the feeding tip. c \ j δ c \ j i oo o O) C \ l X cc CL 00 co m δ CM