DE60214133T2 - Apparatus and method for controlling the distance between a glue applicator cylinder and a corrugating roll for a corrugator machine - Google Patents

Abstract

The machine for the production of corrugated cardboard comprises: a first corrugating roller (7); a second corrugating roller (9) co-operating with the first corrugating roller for corrugating a sheet of web-like material (N), which passes between said first corrugating roller and said second corrugating roller, which are provided with projections that mesh together; a gluing assembly (31) with a gluing cylinder (41), which co-operates with the first corrugating roller for applying a glue on the crests of said web-like material; and adjustment means for adjusting the position of the gluing cylinder with respect to the first corrugating roller. <??>The adjustment means comprise a detector for detecting a parameter indicating a variation in the speed of rotation of the gluing cylinder. The position of the gluing cylinder (41) is adjusted according to said variation in speed. <IMAGE>

Description

Technical part

The Invention busy himself with a machine for the production of corrugated cardboard and in particular with an improvement of the control system for controlling the distance between the glue cylinder and the main corrugating roll over which the web material is running, which is to take up the adhesive, that of the adhesive cylinder on the crests is delivered, which are formed by the two corrugating rolls.

State of the art

Attachments for the Manufacture of corrugated board include a number of machines or Workstations, with one or more machines in general as one-sided ("single facers ") and having a pair of cooperating corrugating rolls, each of them meshing with each other Has ribs and grooves while a web material, namely a sheet or a sheet of paper or cardboard through the between The nip formed in the two rolls runs so that the web material is corrugated.

The web-like corrugated material remains at the first corrugating roll and runs before past an adhesive cylinder, the glue on the crests of the Applying waves that have been formed in the web material. Downstream to the gluing area is on the ridges of the corrugated material, that is moistened with glue, applied a second smooth web, For example, a sheet of paper or cardboard, the so-called Cover layer of corrugated cardboard forms. A second cover page will be then on the opposite lying surface the corrugated web applied in a downstream machine.

one The critical aspects of one-sided machines is the Controlling the relative position between the first corrugating roll over which the To be provided with waves web material, and the adhesive cylinder. In fact, the distance between the surface of the adhesive cylinder must be and the surface to be pasted be controlled so that a uniform application of the adhesive on all combs and the entire transverse length of the web material is ensured, that is on the entire length of each Comb. Usually that touches surface the adhesive cylinder does not support the material; instead one stays small distance between them on the order of the thickness of the adhesive film, the active area covered by the adhesive cylinder.

The Control of the relative position between the corrugating roll (or more precisely between the corrugated paper which is on the roller itself is) and the adhesive cylinder is a critical aspect in the Manufacture of corrugated cardboard in that of the precise control this parameter the quality the bonding between the corrugated cardboard sheet and the smooth Cardboard sheet, that is the so-called top layer, depends. An inaccurate control leads to an uneven distribution of the Glue and thus to the risk that the two sheets, namely the smooth and wavy, do not stick together exactly.

During the Operation of the machine occur changes Operating conditions that affect the correct bonding can. In particular, the assembly comprising the first corrugating roll and the second corrugating roll, with each order change be replaced when about the shape and size of the corrugation of the cardboard of one order to the next to change. The insertion a so-called cartridge, that is, the assembly of the two Corrugating rolls, leads into the machine on the need to adjust the position of the adhesive cylinder in terms of the first corrugating roll.

One other for a proper bonding to be considered Factor is the possible change in strength of the web material supplied to the machine. This strength can For example, if the coil from which the material of the fed on one-sided machine is being replaced. Even very small changes in the strength of the paper can cause significant changes in the application of the adhesive on the web material lead.

Further occurs while the machine running on an increasing heating of the corrugating rolls, which is caused by a temperature of a suitable heating system, for example, works with steam, which circulates in chambers, the next to the surface the corrugating rolls are located. This warming leads to an expansion of the Fluted rollers. Any increase in the diameter of the first corrugating roll, with which the adhesive cylinder interacts, must be to a setting in the position of the adhesive cylinder lead to optimal conditions for the Apply the adhesive. The diameter can be up change due to temperature changes while of operation.

One not insignificant factor controlling the distance between makes the adhesive cylinder and the corrugating roll critical lies in particular wear of the corrugating roll and therefore in their gradual diameter reduction.

Thus, various systems have been used to perform accurate control of the relative position between the corrugating roll and the adhesive developed cylinder, that is to control the so-called adhesive gap.

In Document EP-B-0601528 is a one-sided machine of the above mentioned Art described in which a special probe the relative distance between the adhesive cylinder and the first corrugating roll continuously detected. The adhesive assembly from which the adhesive cylinder is a part is provided with a limit, which with a fixed Part of the machine frame works together. The limit may be extended or shortened be by a special actuator in such a way that the effective distance between the glue cylinder and the corrugating roll modified and the distance constant to a predetermined value is held. This system is especially complicated and presents enough reliability in the positioning between the adhesive cylinder and the corrugating roll not sure. In particular, the sensor is in a critical area the machine is positioned and significant thermal load exposed and greatly influenced by the vibrations of the device. Further considered the system does not wear the corrugating roller and any differential thermal expansion due to the fact that the roller itself subjected to different temperatures in the different areas is.

The Document EP-A-0870598 proposes before, a fixed distance between the corrugated web (and thus the corrugating roll) and the adhesive cylinder can not be maintained. Instead, it is recommended that the adhesive cylinder against the Combs of the paper sheet or corrugated cardboard, which runs over the first corrugating roll, whereby hence the distance between the carton and the adhesive cylinder is eliminated. This solution on the one hand simplifies the control of the position of the adhesive cylinder, On the other hand, does not provide satisfactory bonding. by virtue of the contact force between the combs the corrugated cardboard and the adhesive cylinder tend to that the adhesive is pushed away from the tips of the combs and over the Sides of the combs where it is to the subsequent sticking of the top layer nothing contributes. Continue leads the contact between the adhesive cylinder and the corrugating roll for Generation of larger vibrations and a higher one Wear of the machine parts.

In the document EP-A.1086805, the relative position between the Adhesive cylinder and the corrugating roller by pressing the end bearing of the adhesive cylinder against the repository of the corrugating roll and by measuring the contact force controlled. Furthermore, a mechanism is provided which makes it possible increase or decrease the distance between these bearings until a desired contact force is reached. Accordingly, there is a very accurate relative Position between the active surface the adhesive cylinder and the corrugated paper web over the Corrugated roller guided becomes. This system proves to be very complicated due to the Need to have a variety of actuators available to have. A particularly critical and complicated aspect is the Mechanism for adjusting the distance between the repositories of the Adhesive cylinder and those of the corrugating roller.

In The document EP-B-0786329 become single-sided machines with systems for controlling the distance between the adhesive cylinder and the Corrugating roller described on the determination of an operating parameter based. This parameter can be the vibration, the noise, the torque acting on the adhesive cylinder or the reaction force between the adhesive cylinder and the corrugating roll. The measurements are therefore overall error-prone insofar as what parameter Whatever is considered, he not only by the distance between the adhesive cylinder and the corrugating roll but also by external Factors that have nothing to do with the distance. The Control is therefore far from being accurate and is relative consuming, because the use of special sensitive sensors necessary is.

Document EP-A-0734849, which forms the basis for the preamble of the independent claims, describes a one-sided machine in which the distance between the corrugating roller and the adhesive cylinder is controlled by detecting its speed. A first detecting means reads the peripheral speed of the corrugating roller and a second detecting means reads the peripheral speed of the adhesive cylinder. The detection means are associated with motors that drive the corrugating roller and the adhesive cylinder. The adhesive cylinder rotation is maintained at a predetermined value so that the peripheral speed of the adhesive cylinder is different from the peripheral speed of the corrugating roller. The distance between the adhesive cylinder and the corrugating roll is adjusted by gradually moving the adhesive cylinder toward the corrugating roll until a variation in the rotational speed of the adhesive cylinder (caused by the contact of the cylinder with the corrugating roll) is detected. The distance between the two elements is recorded at this point. The system is not very effective because of the friction created by the contact of the paper passing over the corrugating roll, and the adhesive cylinder is not sufficient to cause circumferential acceleration of the adhesive cylinder and the associated drive. However, the acceleration occurs only when the adhesive cylinder is brought extremely close to the corrugating roll and pressed onto the board with considerable force.

Farther does not see the possibility described in EP-A-734849 an adjustment of the distance between the adhesive cylinder and the corrugating roller before while a single order is processed, that is, during the production of a certain kind of material. The distance is only adjusted when the order changes. Consequently, the device takes into account not (a) variations in roll diameter due to temperature variations, the while of the process as well as of speed changes, (b) thick fluctuations each sheet of cardboard from the same spool, for example in small vibrations in the cardboard sheet production parameters have their cause.

Tasks and summary the invention

Of the Invention is based on the object, a machine for manufacturing of corrugated cardboard or to create a so-called single-sided machine in which it is possible is, in more reliable more precisely and easily the position of the cylinder with respect to the To control corrugating roll, which cooperates with the cylinder.

A Another object of the invention is to provide a method for controlling the operating condition of the adhesive cylinder with respect to the corrugating roll.

• – eine erste Riffelwalze;
• – eine zweite Riffelwalze, die mit der ersten Riffelwalze zum Wellen eines Bogens einer Bahn zusammen wirkt, welche zwischen der ersten Riffelwalze und der zweiten Riffelwalze hindurch läuft, die mit Erhebungen und Nuten, die miteinander kämmen, ausgerüstet sind;
• – eine Klebstoffanordnung mit einem Klebstoffzylinder, der mit der ersten Riffelwalze zum Auftragen eines Klebstoffes auf die Kämme der Bahn zusammen wirkt;
• – Mittel zur Übertagung von Bewegung auf den Klebstoffzylinder, welche den Klebstoffzylinder mit einer Umfangsgeschwindigkeit drehen, die von der Umfangsgeschwindigkeit der ersten Riffelwalze sich unterscheidet oder genauer, die unterschiedlich ist zur Umfangsgeschwindigkeit des Bahnmaterials, welches an der Walze haftet;
• – Einstellmittel zum Einstellen der Position des Klebstoffzylinders bezüglich der ersten Riffelwalze;

wobei sich die Vorrichtung dadurch kennzeichnet, dass die Einstellmittel einen Detektor zum Erfassen der Umfangsverschiebung zwischen dem Klebstoffzylinder und den Bewegungsübertragungsmitteln umfassen, wobei die Position des Klebstoffzylinders bezüglich der ersten Riffelwalze entsprechend der Umfangsverschiebung gesteuert wird.The above and other objects and advantages of the invention are basically achieved with a single-sided machine comprising:

• A first corrugating roll;
• A second corrugating roll co-operating with said first corrugating roll for corrugating a sheet of a web passing between said first corrugating roll and said second corrugating roll, which are provided with protrusions and grooves which mesh with each other;
• An adhesive assembly having an adhesive cylinder cooperating with the first corrugating roller for applying an adhesive to the ridges of the web;
• - means for transferring motion to the adhesive cylinder, which rotate the adhesive cylinder at a peripheral speed different from, or more precisely different from, the peripheral speed of the first corrugating roll, which is different from the peripheral speed of the web material adhering to the roll;
• Adjusting means for adjusting the position of the adhesive cylinder with respect to the first corrugating roller;

wherein the apparatus is characterized in that the adjusting means comprise a detector for detecting the circumferential displacement between the adhesive cylinder and the movement transmitting means, the position of the adhesive cylinder being controlled with respect to the first corrugating roller in accordance with the circumferential displacement.

in the Therefore, the essential parameter is the setting of the relative Distance between the corrugating roller and the adhesive cylinder one Modification in the relative circumferential position between the adhesive cylinder and a component for transmitting the Movement on the adhesive cylinder, for example a wheel, such as a gear wheel or a roller. The result is a system with very low inertia. The circumferential position of the adhesive cylinder with respect to the respective motion transmission means changed quickly, as soon as a frictional force on the cylinder through the Railway material exercises which is over the combs the corrugating roll is running. This represents a very accurate regulation of the distance between the Corrugating roll and the adhesive cylinder safely.

In the practical embodiment the adhesive assembly is attached in such a way that it in terms of the first corrugating roll is movable, the position of the adhesive assembly according to the variation of the circumferential position of the adhesive cylinder in terms of a component for transmission the movement on the cylinder is modified.

Correspond a practical embodiment The invention provides the adhesive cylinder at a peripheral speed rotated, which is smaller than the peripheral speed of the railway arch, the over the first corrugating roll is running, for example, by 0.5% to 10% smaller, and preferably 1% to 5% smaller. This exercises the web a frictional force and consequently a drag effect on the Adhesive cylinder made of a circumferential displacement between the Cylinder and the wheel transferring Movement on the cylinder causes, if in the manner mentioned the Adhesive cylinder is extremely close to the corrugating roll, or, more precisely, if he reaches the corrugated web lying on the corrugating roll.

Preferably comprise according to a other possible embodiment the invention, the motion-transmitting Means a wheel that is coaxial with the glue cylinder and with it connected in such a way that there is a limited circumferential movement in terms of of the adhesive cylinder can perform and that through a transmission part, for example, a flexible belt or a chain part driven becomes. Next are sensor means provided for the circumferential relocation between the glue cylinder and the wheel.

In the practical embodiment The adhesive cylinder can be a shifted circumferential position in terms of the mechanical transmission, that turns him, accept. In a first possible embodiment The invention is the displacement, for example, by a load cell or another feeler grasped, suitably between a bearing of the adhesive cylinder and its axis is arranged.

To a practical embodiment the invention are limiting means for limiting the circumferential displacement provided between the wheel and the adhesive cylinder.

In a possible embodiment For example, the detector includes a movable member that is pivotable, for example is and interacts with a cam, with the relative position of the movable member and the cam by the circumferential position of the wheel and the adhesive cylinder are determined. Furthermore is a sensor (for example a microswitch, a capacitive sensor, a magnetic sensor or the like) to control the movement of the movable member controlled by the cam.

Independently of, with which system the change the circumferential position the adhesive cylinder and the motion transmission is detected works the cylinder essentially as a switch that is actuated as a result of the frictional force coming from the corrugating roll or more accurately through the over the roller moving web is applied to the cylinder.

According to the invention is still a method of controlling the distance between an adhesive cylinder and a first corrugating roll in a machine for the production of Corrugated cardboard created, which the adhesive cylinder, the first corrugating roll and a second corrugating roll is included with the first corrugating roll for corrugating an arch of a web cooperates, on which the Adhesive cylinder applies glue. The corrugating roller and the Adhesive cylinders become reciprocal at different peripheral speeds turned. The adjustment method according to the invention is characterized characterized in that the reciprocal position of the corrugating roller and the adhesive cylinder by gradual approach of the adhesive cylinder and the corrugating roller is set until an angular displacement or displacement between the adhesive cylinder and motion transfer means the cylinder is caused by the frictional force, that of the over the corrugating roll transfer current train becomes. The angular displacement serves as a signal for setting the mutual distance between the glue cylinder and the corrugating roll.

Further advantageous features and embodiments the machines and the method according to the invention are in the attached claims and are with reference to a non-limiting Example of an embodiment described below.

Brief details of the drawings

One better understanding The invention will become apparent from the accompanying description and the accompanying Achieves figures that are a practical non-limiting Example of an embodiment according to the invention demonstrate. Show it:

1 and 2 two side views of the machines according to the invention in two different configurations of the adhesive assembly;

3 and 4 explain two longitudinal cross sections of the adhesive cylinder corresponding to the two levels III-III and IV-IV in 5 ; and

5 FIG. 2: a partial frontal cross-sectional view corresponding to VV in FIGS 3 and 4 ,

Detailed description a preferred embodiment the invention

1 shows the machine with the adhesive assembly in the working position with the adhesive cylinder in contact with the web passing over the first corrugating roll while 2 shows the same machine with the adhesive assembly in the open state, that is, where the machine is pre-set to allow replacement of the group or cartridge of corrugating rolls, for example, if a manufacturing job has changed.

The whole with 1 designated machine has a load-bearing structure 3 on which an arrangement 5 which is a first corrugating roll 7 and a second corrugating roll 9 having. The two corrugating rolls 7 and 9 are on a unit or cartridge 11 which can be inserted into and removed from the machine to exchange the corrugating rolls for others with a different configuration of the ribs which function to provide the web with shafts which are inserted into the machine.

The corrugating roll 7 has several ribs or waves 7C on its cylindrical surface, with which corresponding ripples or ribs 9C the second corrugating roll 9 comb. By the between the two rolls 7 and 9 defined nip, in which the ribs 7C and 9C mesh with each other, a web N is passed, for example, a sheet of paper or cardboard, which zwi between the two rollers 7 and 9 be corrugated, wherein the web N at the exit of the nip between the two rolls on the first corrugating roll 7 gets stuck, for example, by a vacuum system or a compressed air system of a known type. The first corrugating roller 7 turns around an axis 7A in the direction indicated by the arrow f7 while the axis 7A essentially with regard to the unit 11 it is firm that the rollers 7 and 9 wearing. On the other hand, the second corrugating roll 9 from a pair of arms 13 worn on a pivot axis 15 are hinged, which are parallel to the axis 7A the first corrugating roll 7 extends and to the axis 9A are hinged to which the second corrugating roll 9 rotates in the direction indicated by the arrow f9 direction. The second corrugating roll 9 is against the first corrugating roll 7 by means of a pair of actuators 17 (In the example shown, a pair of so-called "Torpressen") pressed on the two end arms 13 act on the axis 9A the corrugating roll 9 wear. The position of the arms 13 and thus the second corrugating roll 9 concerning the unit 11 and in terms of structure 3 the machine 1 is from a with 19 Detected sensor detected via an interface with a control unit 21 for reasons to be explained is connected. The sensor may also be omitted in certain embodiments of the machine as well as in certain implementations of the control method. The corrugating roll 9 may have a diameter which may be slightly smaller (compared to the representation in the figure) than the diameter of the corrugating roll 7 , This reduces the number of ribs 7C . 9C , which mesh with each other in the area of cooperation between the two corrugating rolls and thus facilitates the formation of the waves on the web N. To the extraordinary flexibility of the corrugating roll 9 to overcome, if it has a particularly small diameter, can be provided that they are in an intermediate position between the arms 13 by one or more straps, by the unit 11 are supported, which is suitable over the bottom portion of the corrugating roll 9 to run.

At the structure 3 The machine is an adhesive arrangement 31 , The adhesive arrangement 31 is to a swing axis B parallel to the axes 7A and 9A the corrugating rolls 7 and 9 attached. The geometric swing axis B extends parallel to a second axis C of an eccentric cam 33 , The angular or circumferential position of the eccentric cam 33 can be modified with an actuator, such as a stepper motor reducer 35 can be. The rotation of the eccentric cam 33 about the axis C, a modification in the position of the geometric axis B of the vibration of the adhesive assembly 31 for reasons to be explained.

The adhesive arrangement 31 carries an adhesive tank 37 from which adhesive through a transfer cylinder 39 which rotates in the direction of arrow f39. The transfer cylinder 39 extends tangentially to an adhesive cylinder 41 which in turn rotates in the direction f41, ie in the same direction as the transfer cylinder 39 and is in contact with the latter. This will make glue out of the tank 37 on the cylindrical surface of the adhesive cylinder 41 transferred and from there to the ridges of the railway N, which over the first corrugating roller 7 is guided and before in the nip between the corrugating roll 7 and the corrugating roll 9 has been deformed.

The working position of the adhesive arrangement 31 is due to the position of the axis B and by a pair of eccentric pins 42 defined by the unit 11 be worn.

If a unit 11 inserted into the machine are those of the unit 11 worn eccentric pins 42 the position of the adhesive assembly 31 adapted in the way that the axis of the adhesive cylinder 41 perfectly parallel to the axis 7A the rotation of the first corrugating roll 7 located. This alignment is usually done only once when a group of corrugating rolls 7 . 9 that of the unit 11 is inserted into the machine is inserted.

The vibration of the adhesive arrangement 31 about the axis B is by a piston-cylinder actuator 47 controlled, the at 49 to the solid structure 3 the machine and at 51 to the adhesive assembly 31 is articulated. The working position and the opening position of the adhesive assembly 31 are in the 1 and 2 as described above. According to 2 is the adhesive arrangement 31 from the corrugating roll 7 moved away to a replacement of the unit 11 to enable the corrugating rolls 7 and 9 wearing.

Along the development of the corrugating roll 7 downstream of the through the position of the adhesive cylinder 41 defined adhesive area is a pressure roller 55 provided by a pair of arms 56 is worn at the 59 to the solid structure 3 articulated by actuator 61 are applied to the pressure roller 55 against the corrugating roll 7 to press. About the pressure roller 55 is a second endless web material, such as a paper sheet N2 out, which by a cylinder 63 to be led. The N2 lane is covered by the roll 55 applied to the ridges of the web material N pressure applied previously with adhesive through the adhesive cylinder 41 has been provided. The second web N2 forms the so-called cover layer of the corrugated board produced by the machine. The corrugated cardboard CO, made from the corrugated Bahnmate N has been made in this way is glued onto the smooth web N2. This material is then sent to another machine for applying a second smooth web on the opposite side and may then be joined to other corrugated board sheets.

As in particular in the longitudinal sections of the adhesive cylinder 41 according to 3 and 4 is shown, the adhesive cylinder 41 by means of a pair of bearings 71 on the adhesive assembly 31 carried. At one end of the adhesive cylinder 41 is a role 73 with the interposition of a mechanism 75 (described below), which carries a limited circumferential movement of the roller 73 on the axis 41A of the cylinder 41 allowed, with which the roll is coaxial. About the role 73 runs a toothed belt 77 who then has another role 79 that are on the axis of the transfer cylinder 39 is attached, as well as a powered roller 81 The result is the movement of a motor 83 receives. The latter then drives the transfer cylinder 39 and the adhesive cylinder 41 through the belt 77 ,

The engine 83 generated peripheral speed of the adhesive cylinder 41 is chosen to be slightly lower than the peripheral speed of the first corrugating roll 7 , and, more precisely, is slightly lower than the peripheral speed of the most radial locations (ie, the crests) of the corrugated web N, between rolls 7 and 9 passes through and over the corrugating roll 7 is guided. Characteristically, the difference in peripheral speed is in the range of 0.5% to 10% and preferably between 1% and 5%.

With an arrangement of this kind, it is possible to determine the position of the adhesive cylinder with respect to the corrugating roll 7 to control and adjust, where as the control parameter, the angular position of the role 73 with respect to the adhesive cylinder 41 in the manner described below.

A wheel 101 (see also 5 ) is on the shaft 42 ( 3 and 4 ), which is integral with the adhesive cylinder 41 and from the camp 71 is worn; a radial splint 103 is integral with the wheel. The sapwood 103 is in a tangential housing 105 arranged by two stops 107A . 107B in the corpus of the scroll 73 is limited. The two stops 107A and 107B are mutually spaced by an angle, for example, in the range of about 5 ° to 25 °, for example, about 15 °. In this way, the gear can 73 (on which the belt 77 runs) on the axis 41A with respect to the adhesive cylinder 41 oscillate at an angle through the two stops 107A . 107B is defined.

A cam profile 109 is on the face of the wheel 101 trained, on which a feeler 111 resting, which is formed by an arm, on an axis 111A hinged, which with respect to the axis 41A of the adhesive cylinder 41 oriented by 90 °. The contact between the feeler arm 111 and the cam 109 is ensured by a spring between the feeler arm 11 and a lid 113 arranged on the roll 73 is attached. A mug or a plate 115 in a central opening 117 in the lid 113 can protrude, is with the feeler arm 111 integral. A microswitch 119 or another sensor means, for example inductive, capacitive or the like, is arranged in front of the opening and communicates with the machine control unit via an interface. The material of the plate or mug 115 can be selected according to the type of sensor used.

Regardless of the type used, the probe may be able to determine whether the plate or the cup 115 is in an extended or contracted position with respect to the housing, by the wheel 73 and the lid 113 is formed.

The device described so far works as follows: When the unit 11 is inserted into the machine, the adhesive cylinder 31 into the working position ( 1 ), the actuator 47 is retracted until the adhesive assembly against the eccentric cam 42 properly applied. By adjusting the angular position of the eccentric cams 42 becomes the axis of the adhesive cylinder 41 parallel to the axis of the corrugating roll 7 brought. The eccentric cam 43 is brought into an angular position, so that the adhesive cylinder 41 at a maximum distance to the corrugating roller 7 located.

In the mentioned configuration, the distance between the active cylinder surface of the adhesive cylinder 41 and the train N, which passes over the corrugated roller 7 is certainly greater than the optimal distance to produce perfect gluing. To set this distance to the appropriate value, after starting and feeding the web N by the machine, the actuator 35 who's the eccentric sock 33 turns, activates, so that the swinging axis B is closer to the vertical plane, which is the axis 7A the corrugating roll 7 is brought while the machine is ramped up to operating speed, the adhesive cylinder 41 at a slightly slower speed than the web turns, over the first corrugating roll 7 running.

Under these circumstances, the cylinder becomes 41 through the effect of one of the attacks 107A . 107B on the sapwood 103 rest, turn and take the wheel 101 in rotation with and therefore the shaft 42 that is integral with him; the shaft itself is integral with the adhesive cylinder 41 , The plate or the mug 115 will get into the retracted position because in this angular position ( 5 ) the feeler arm 111 not in contact with the raised profile of the cam 109 located. When the adhesive cylinder 41 the corrugated web resting on the ribs of the first corrugating roll 7 rests, reaches, frictional force between the web and the adhesive cylinder 41 generated (increased by the pressure of the adhesive layer on the adhesive cylinder 41 ), wherein the friction force is the adhesive cylinder 41 moved forward by a few burrs, resulting in a relative angular displacement or displacement between the cylinder (and consequently the wheel 101 ) and the motion-transmitting wheel 73 leads. The angular displacement or displacement is limited by the other of the two stops 107A . 107B against which the radial splint 103 now resting. The reciprocal angular displacement between the wheel 101 and the wheel or the roller 73 is enough, the feeler arm 111 on the cam profile 109 to move, causing the plate or the cup 115 moves abroad. This movement is through the microswitch 119 detected, which generates a signal, resulting from the control unit 21 is perceived.

The angular displacement between the adhesive cylinder 41 and the wheel or the roller 73 is determined by the fact that the web moves forward at a different speed (in this case a higher one) than the peripheral speed of the glue cylinder 41 which is moved by its associated drive. As a result, the web N on the adhesive cylinder begins to exert a frictional force, and thus to take along, before any contact between the web itself and the active surface of the cylinder takes place due to the presence of the adhesive film on the cylinder.

Because the adhesive cylinder 41 is free to shift to a certain extent in the circumferential direction (defined by the distance between the stops 107A and 107B ) concerning the role 73 thanks to the sapwood 103 and the two attacks 107A . 107B , the effect of the frictional force will be a circumferential displacement of the cylinder 41 with respect to the motion transmission, causing the signal through the microswitch 119 is produced.

The distance between the adhesive cylinder 41 and the corrugating roll 7 is fixed by stopping the rotation of the eccentric cam 33 when the microswitch 119 the movement of the feeler arm 111 determines, or preferably the eccentric cam 33 is caused to turn back in the opposite direction once the microswitch 119 the displacement of the feeler arm 111 finds. The displacement in the opposite direction is performed by a certain amount, which is determined by the angle of rotation of the cam 33 is determined. The predetermined rotation corresponds to a predetermined distance between the active surface of the adhesive cylinder 41 and the surface of the crests of the web on the corrugating roll. In this way, in practice, the extensive displacement caused by the microswitch 119 is used to define a zero point from which the machine control begins to impress the adhesive cylinder a predetermined distance from the corrugating roll by spacing the adhesive cylinder from the corrugating roll by a predetermined amount that can be programmed by the operator. This predetermined distance can be defined according to the production speed of the machine, the properties of the processed material and other parameters.

Because during operation diameter changes of the corrugating roll 7 due to their heating and / or due to thickness variations of the web N, the unit is 21 that with the microswitch 119 and the actuator 35 via an interface, always capable of any possible circumferential displacement of the adhesive cylinder relative to the roller 43 determine the reduction in the distance between the cylinder 41 and the corrugated web N is due. When this situation occurs, the actuator becomes 35 activates the adhesive cylinder 31 and thus the adhesive cylinder 41 from the corrugating roll 7 moved away by the amount required. The adjustment is extremely accurate due to the distance of the swing axis B from the rest point caused by the eccentric stops 42 is defined. In practice, to avoid such an occurrence, the control system is programmed to hold the adhesive cylinder 41 regularly and gradually to the corrugated roller 7 and thus spacing the two elements by a predetermined amount from zero position, by detecting the angular displacement between the adhesive cylinder 41 in the role 73 is defined. In this way, the correct reciprocal distance between the roller 7 and the cylinder 41 regularly restored, without ever being particularly close due to the random dilatation of the corrugating roll 7 , Similarly, there is an excessive distance between the corrugating roll 7 and the adhesive cylinder 41 through the diameter reduction of the roller 7 avoided as a result of cooling.

The frequency with which the reciprocal distance between the corrugating roll 7 and the adhesive cylinder 41 can be determined also after the production speed or other advantageous considerations.

This method of operation takes into account possible variations in the diameter of the corrugated whale due to temperature fluctuations as well as possible variations in paper thickness.

A load cell or other equivalent probe may be on one or the other or both stops 107A . 107B be provided to the movement of the sapwood 103 instead of the microswitch 119 and the respective components used to determine the circumferential movement of the cylinder 41 concerning the role 73 used to determine. The solution described above offers the advantage of being within the role 73 no wiring is required.

After another operating method, the control of the distance between the adhesive cylinder 41 and the corrugating roll 7 when the first adjustment of the position of the adhesive cylinder 31 about the rotation of the eccentric cam 33 has been carried out, the maintenance of the distance between the corrugated web N and the active surface of the adhesive cylinder 41 the feeler 19 be transmitted. In fact, the position of the arms 13 and thus the second corrugating roll 9 with respect to the axis of rotation 7A the first corrugating roll 7 depends on the diameter of the corrugating roll 7 , the diameter of the corrugating roll 9 and the strength of the web N between the two corrugating rolls. If the change in diameter of the corrugating roll during operation is considered to be negligible during the operation, for reasons which will be explained below, that of the probe 19 detected position a function of the diameter change of the corrugating roll 7 and the change in thickness of the web N. This variation is one which determines the distance between the crests of the corrugation of the web N and the active surface of the adhesive cylinder 41 affected. Therefore, the actuator 35 , the position of the swing axis B and thus the adhesive assembly 31 modified with respect to the corrugating roll 7 on that by the feeler 19 detected signal through a control by the control unit 21 be determined.

An approach of the arm 13 to the feeler 19 shows an increase in the thickness of the web N and / or an increase in the diameter of the corrugating roll 7 and derives from this the necessity, the eccentric cam 33 by means of the actuator 35 to turn and thus the adhesive cylinder 41 from the axis of rotation 7A the corrugating roll 7 move away. A rise of the feeler 19 read distance, however, shows a reduction in the strength of the web and / or reduction in the diameter of the corrugating roll 7 and hence the need to keep the distance between the adhesive cylinder 41 and the axis 7A the rotation of the corrugating roller 7 to reduce.

With the out of the probe 19 It is therefore possible to provide continuous control of the distance between the adhesive cylinder 41 and the corrugating roll 7 without it being necessary to obtain a periodic approach and removal of the adhesive cylinder 31 perform the circumferential displacement of the adhesive cylinder 41 with respect to the motion transmission means 77 . 73 as noted earlier, and to limit this operation to exactly the beginning of the setting when the machine is started.

The diameter variation of the corrugating roller 7 at the setting described above using the signal from the probe 19 is not taken into account is neglected, because the smaller diameter of this roller leads to a smaller variation of the dimensions due to temperature variation. In addition, a change in the diameter of the corrugating roll is mainly caused by a variation of the thermal flow that is removed from the web N during the operation of the machine. In fact, as the machine increases in speed, the amount of web mass passing through it per unit of time increases, and consequently also the heat dissipated by heat conduction between the corrugating roll and the web. Since the radian of contact between the web N and the second corrugating roll 9 very small and compared to the large contact arc of the web N with the top of the corrugating roll 7 is negligible, also the variation of the thermal flux removed from the web N as a function of the change in operating conditions of the machine is negligible. Consequently, the dimensional variation of the corrugating roll is also 9 concerning the dimensional variation of the corrugating roll 7 negligible.

Of course shows the drawing is just an example of an embodiment of the invention as a practical Demonstration of the same in their embodiments and arrangements to be changed without thereby hindering the scope of the inventive concept, which is subject to the invention is left. The reference numerals in the attached claims Their sole purpose is to facilitate their reading and understanding the description and the figures can be referenced, and in no way limit the scope of the protection Claims, in which the above-explained Corrugating rolls are referred to as waves generating rollers.

Claims (25)

Machine for the production of corrugated cardboard with - a first shaft-generating roller ( 7 ); A second shaft-generating roller ( 9 ), which cooperate with the first shaft-generating roller to wave a sheet of sheet material (N) acting between the first shaft-generating roller and the second shaft-generating roller provided with intermeshing protrusions; - an adhesive allocation ( 31 ) with an adhesive cylinder ( 41 ) cooperating with the first wave generating roller for applying an adhesive to the tips of the web material, wherein the first wave generating roller and the adhesive cylinder are rotated at reciprocally different peripheral speeds; Motion transmission means ( 73 . 77 ) for transmitting movement to the adhesive cylinder; Adjusting means for adjusting the position of the adhesive cylinder with respect to the first wave generating roller; characterized in that the adjustment means comprise a sensor ( 109 . 111 . 115 . 119 ) for detecting the angular displacement of the adhesive cylinder ( 41 ) with respect to the motion transmission means ( 73 . 77 ), wherein the position of the adhesive cylinder ( 41 ) with respect to the first wave-generating roller ( 7 ) is controlled according to the angular displacement. Machine according to claim 1, characterized in that the adhesive arrangement ( 31 ) is movably mounted with respect to the first shaft-generating roller, wherein the position of the adhesive assembly according to the angular position change of the adhesive cylinder ( 41 ) is modified with respect to the motion transmitting means. Machine according to claim 1 or 2, characterized in that the motion transmission means comprise a wheel ( 73 ), which with the adhesive cylinder ( 41 ) is connected coaxially and with it, so that the adhesive cylinder and the wheel can perform reciprocal angular movements, wherein the wheel by a transmission member ( 77 ) is moved; and that sensing means ( 119 ) for determining the angular displacement between the adhesive cylinder ( 41 ) and the wheel ( 73 ) are provided. Machine according to claim 3, characterized in that limiting means are provided for controlling the angular displacement between the wheel ( 73 ) and the adhesive cylinder ( 41 ) to limit. Machine according to claim 4, characterized in that the limiting means comprise a pair of angular jumps ( 107A . 107B ) exhibit. Machine according to claim 5, characterized in that the angular jumps with a groove ( 103 ), which is movably mounted between the jumps, wherein the groove and the jumps are each integral with the adhesive cylinder or the wheel. Machine according to one or more of the preceding claims, characterized in that the sensor is provided with a cam ( 109 ) cooperating moving part ( 111 . 115 ), wherein the relative position between the movable part and the cam is determined by the angular position of the wheel and the adhesive cylinder, wherein sensor means ( 119 ) are provided to detect the displacement of the movable part, which is driven by the cam. Machine according to claim 7, characterized that the movable part is a pivoting part. Machine according to claim 7 or 8, characterized that the movable part is carried by the wheel and the cam connected to the adhesive cylinder. Machine according to claim 9, characterized in that that the movable part pivots about an axis which is relative to the Axis of the adhesive cylinder and the wheel oriented by about 90 ° is, and that the cam is the winding of a circular arc around the Has axis of the adhesive cylinder. Machine according to one or more of claims 7 to 10, characterized in that the sensor means a microswitch have, which detects the position of the movable part. Machine according to one or more of claims 7 to 11, characterized in that the movable part and the cam in one of a lid ( 113 ) are covered compartment, which by the wheel ( 73 ) is integral and in which an opening ( 117 ) is provided, through which the sensor means ( 119 ) determine the position of the moving part. Machine according to one or more of the preceding claims, characterized in that the adhesive cylinder ( 41 ) is set in rotation at a peripheral speed which is less than the peripheral speed of the sheet of web material passing over the first corrugating roll. Machine according to claim 13, characterized that the peripheral speed of the adhesive cylinder between 0.5% and 10% and preferably between 1% and 5% is smaller as the peripheral speed of the over the first waves forming Roller is running web material. Machine according to one or more of the preceding claims, characterized in that the adhesive arrangement about an oscillating axis (B) parallel to the axis of rotation of the first and the second Wave generating rollers and the adhesive cylinder is stored and in the working position against a jump ( 42 ), wherein the position of the swing axis for adjusting the position of the adhesive cylinder with respect to the first wave-forming roller is modifiable. Machine according to claim 15, characterized in that the oscillating axis of an eccentric cam ( 33 ), which is an actuator ( 35 ), so that the rotation of the eccentric cam by means of the actuator modifies the position of the oscillating axis. Machine according to one or more of the preceding claims, characterized in that the second wave-generating roller is guided by a pair of arms ( 13 ), to which an actuator ( 17 ) associated with the second wave forming roller ( 9 ) against the first corrugating roller ( 7 ) and that the second corrugating roller ( 9 ) a position sensor ( 19 ) for detecting the positional variation of the second wave forming roller, wherein the signal generated by the sensor controls the position of the adhesive cylinder. Machine according to claim 17, characterized that the second shaft-generating roller has a diameter which smaller than the diameter of the first shaft-generating roller. Method for controlling the distance between an adhesive cylinder and a first corrugating roll in a corrugating machine with an adhesive cylinder ( 41 ), Motion transmission means ( 73 . 77 ) for the adhesive cylinder, with a first corrugating roller ( 7 ) and a second corrugating roller ( 9 ) coacting with said first corrugating roll for corrugating a sheet of sheet material (N) passing over said first corrugating roll on which said adhesive cylinder applies adhesive, and wherein said adhesive cylinder and said first corrugating roll have reciprocally different peripheral speeds rotated and reciprocally approximated until a frictional force between the adhesive cylinder and the sheet of sheet material is exchanged, characterized in that the relative angular displacement between the adhesive cylinder ( 41 ) and the motion transmission means ( 73 . 77 ) is detected and the distance between the first shaft-generating roller and the adhesive cylinder is adjusted according to the angular displacement. Method according to claim 19, characterized that the adhesive cylinder is rotating at a peripheral speed is offset, which is smaller than the peripheral speed of the arc of railway material over the first shaft-generating roller is running, and that the adhesive cylinder is gradually brought up to the first shaft-generating roller, until an angular displacement of the adhesive cylinder with respect the motion transmission means is detected. A method according to claim 19 or 20, characterized in that the adhesive cylinder by a transmission wheel ( 73 ) is rotated, which is coaxial with it and that an angular displacement of the adhesive cylinder with respect to the wheel ( 73 ) is detected. Method according to one or more of claims 19 to 21, characterized in that when the angular displacement is detected, the approach movement the adhesive cylinder and the first shaft-generating roller stopped and that the adhesive cylinder and the shaft-generating roller spaced apart to a predetermined extent are to set a predetermined distance between the surface of the Obtain adhesive cylinder and the sheet of sheet material. Method according to one or more of the preceding Claims, characterized in that during the production of corrugated cardboard the adhesive cylinder regularly the approximating the first shaft generating roller and that any approach is stopped when the angular displacement is detected; and that the adhesive cylinder and the shaft-generating roller at any time spaced by a certain predetermined size are. Method according to claim 22 or 23, characterized that the predetermined size accordingly Corrugated Board Production Speed is varied. Method according to one or more of claims 19 to 24, characterized in that - the first and the second wave-generating roller are rotated and the sheet of sheet material is guided over the first shaft-generating roller; - The adhesive cylinder is rotated at a peripheral speed, which is different from the peripheral speed of the web material, which is guided over the first shaft-generating roller; The adhesive cylinder is gradually brought up to the first wave generating roll until a working position is reached which is achieved on the basis of the variation detection in the angular position of the adhesive cylinder with respect to the motion transfer means associated therewith and the distance between the adhesive cylinder and the Wave generating roller according to the detection of Variation of the angular position is set; The positional variation of the second wave generating roller is detected with respect to the rotation axis of the first wave generating roller; and - the position of the adhesive cylinder with respect to the axis of rotation of the first wave generating roller is varied as a function of the variation of the position of the second wave generating roller with respect to the axis of rotation of the first wave generating roller.