METHOD AND APPARATUS FOR DECELERATING A JUMBO ROLL OF A PAPER OR BOARD MAKING MACHINE

Abstract: The apparatus comprises brake shoes (9, 11) and arms (8) provided with means (13) producing the decelerating force. The arms can simultaneously transfer and decelerate the jumbo roll (2) whereby also a loop in the web is formed rapidly and easily.

Description: Field of Invention: The present invention relates to a method of and an apparatus for changing the jumbo roll of a paper of a board making machine. Prior art: Prior art braking devices are disclosed for instance in DE-A-24 27 466 and FI-A-51463. The DE specification discloses an apparatus in which a brake drum disposed at both sides of the paper roll rotates with the roll. Brake levers connected by articulated joints at their lower ends to the bed are disposed on both sides of the brake drum. Brake shoes, which are loaded against the drum by means of a pneumatic device arranged approximately in the middle of the levers, are connected to the upper ends of the brake levers via an articulated joint. Although the apparatus quickly stops the rotation of the jumbo roll, further measures still take time as the roll has to be transferred by a separated crane. The Finnish patent specification discloses an apparatus for decelerating the winder of a paper or a board machine. The decelerating device mainly comprises a braking arm disposed by the side of the winder to move synchronously with the center of the reel drum which allows deceleration of the reel drum and the roll around it in any desired phase. The brake carriage comprises special coupling means for coupling the brake to the reel drum and brake means, i.e. a brake disc and brake blocks. The apparatus operates in the following way: the rotating velocity of the coupling means is accelerated to be almost the same as the rotational velocity of the new reel drum and when the rotational velocity of the jumbo roll has decelerated to be the same as the velocity of the coupling means, the coupling is attached to the drum. Then the rotation of the roll can be stopped at any desired moment by the braking means, i.e. by the brake disc and the brake blocks rotating with the coupling means. Although the device according to this patent specification facilitates many operations which have previously been very difficult to perform, it still is very complex, it requires electronics, electric motors etc. This involves very high costs. Further the apparatus requires a remarkably large space by the side of the winder. As is described above, some parts and functions of both of these devices are not satisfactory. The apparatus of the DE specification, although it is simple, makes the reel drum exchange difficult. The decelerating apparatus according to the invention of the FI specification, which meets the operational requirements, has a complex structure and thus it is expensive and prone to disturbances. In DE-A-3321213 there is disclosed an apparatus for winding a continuous roll of web wherein there are illustrated transfer levers which act on bearing bushings to force the reel spool against the winding drum. The Levers facilitate transfer of a full reel spool to the ends of tracks where a separate, stationary positioned braking and/or holding means is located. The Levers serve both to urge the spools against the drum and to transfer the wound reel spool to the ends of the track before a further spool is wound. The Levers each carry only a single brake shoe activated by air bellows under the shoe to slow down the wound spool but gives only limited braking movement and wears quickly and is not sufficient to stop the roll rotation completely. This apparatus is slow in changing spools and results in paper wastage. U.S.-A-3586253 which has been used as the basis for the preamble of the independent claims discloses a reel loader with displaceable pressure arms which also function as the means for displacing the wound roll to a stationary brake station and which then return to press the empty reel against a drive roll which is a time consuming and wasteful operation. Disclosure of Invention: To overcome these disadvantages, a new type of decelerating apparatus has been developed, which enables a new winding operation to be promptly effected whilst the wound roll is being displaced with controlled braking away from the winding position. According to the present invention there is provided a method of changing a wound jumbo roll on a reel of a paper or board winding machine, said machine including displaceable pressure means which in use urge the reel against a Pope winder to form a wound jumbo roll, and including decelerating apparatus provided with brake means which are activated to decelerate a wound roll upon release of the displaceable pressure means from urging the wound jumbo roll against the winder; said method being characterised by the steps of engaging the reel of the wound jumbo roll with the brake means of the decelerating apparatus when said reel is still in the winding position, causing the pressure means to release the wound roll, displacing the decelerating apparatus with wound roll away from the Pope cylinder and along support rails whilst at the same time continuing the braking action, displacing said displaceable pressure means to engage and urge a further reel supported on said rails against the Pope cylinder for further winding, and of decelerating the speed of rotation of the jumbo roll using a pair of brake shoes positioned opposite each other and pivotal on the transfer arms (8) on both sides of the reel machine in such a way that the brake shoes make full contact with the jumbo roll journals during the time that the arms (8) transfer the jumbo roll towards its removal position. Also according to the invention there is provided in a paper or board winding machine apparatus for changing a wound roll and at the same time decelerating the wound jumbo roll comprising a winder, displaceable pressure means for urging a reel drum or reel against the winder and brake means for decelerating a wound reel during displacement, characterised by a displaceable decelerating apparatus being provided separate from said displaceable pressure means and comprising displaceable transfer means on both sides of the machine with each transfer means including brake means which are actuable by a piston-cylinder arrangement, said displaceable pressure means being displaceable from urging the wound jumbo roll against the Pope cylinder winder so as to release said roll, and said displaceable transfer means being engageable by said brake means with the reel of the wound roll and displaceable away from the Pope cylinder so as to displace, with continued braking, the wound reel released by the pressure means along support rails of the machine whilst said displaceable pressure means is controlled to be displaceable to urge a further reel supported on said rails against the Pope cylinder for further winding, and wherein said displaceable transfer means (8) comprise an arm provided on each side of the machine and each having brake means each comprising two brake shoes opposite each other for gripping the jumbo roll journal between them in such a way that the pivotal mounting of one brake shoe (11) on each arm (8) and one shoe on a brake lever (10) on each arm (8) allows full braking force to be applied to the journals during the time that the wound reel is moved from the winding position to the removal position. Some of the advantages of the method and the apparatus according to the invention are for instance its very simple and inexpensive structure and the fact that the time required for the reel drum exchange is essentially shorter than by any prior art method or apparatus. Brief Description of Drawings: The method and the apparatus according to the invention are further described below, by way of an example, with reference to the accompanying drawings in which: Fig. 1 is a general elevational view of the winder of a paper or a board manufacturing machine, illustrating the location of the decelerating apparatus according to the invention, in relation to the rest of the machinery; and Fig. 2 is a detailed side view of a preferred embodiment of a deceleration apparatus according to the invention. Detailed Description of the Preferred Embodiment: In Fig. 1, decelerating apparatus 1 is located at the transfer device for the jumbo roll 2 (very large roll) of a paper of a board manufacturing machine. The numeral 2 refers to a finished jumbo roll which has been wound around a reel drum 3. Also, bearing housings 4, on which the jumbo roll is supported on rails 5, are provided at the ends of the reel drum 3. A known displaceable pressure means 20 is provided comprising secondary pivotal pressure arms for urging a reel drum 3 against the Pope cylinder during winding and displaceable by a piston-cylinder. According to Fig. 2, the decelerating apparatus 1 is connected via an articulated joint (pivot) to a bracket 7, which is fixed to the bed. The decelerating apparatus itself comprises an arm 8, which is articulately connected to the bracket 7, and a brake shoe 9 swinging or pivotting in a vertical plane in the machine direction which shoe 9 is connected to the upper end of the arm 8 by an articulated joint or pivot connection. Also, a brake lever 10 is pivotally connected to the arm 8 and the other end of the lever 10 is provided with a brake shoe 11, which pivots in the machine direction. The length of the brake lever 10 and the arm 8 is chosen to make the brake shoe 11, which is pivotally connected to the brake lever 10, clearly reach to the paper machine side of the reel drum axis when the jumbo roll is finished. Further, the dimensioning is chosen so as to maintain the brake shoes 9, 11in contact with the counter surface of the reel drum the whole time when the jumbo roll 2 rolls along the rails 5 to a position over the bracket 7, which bracket 7 is mounted on the bed. The brake lever 10 is connected to a bracket 12 of the arm 8 via a pressure medium cylinder 13 or a corresponding means by which the brake shoes 9, 11 are pressed towards or drawn away from each other. Further, the arm 8 is connected via a pressure medium cylinder 14 or a corresponding means to a body construction 15. In the embodiment of Fig. 1, identical decelerating devices 1 are provided at both sides of the winder, which devices 1 preferably are connected to each other at the lower ends of their arms 8 with an adjusting rod disposed in the transverse direction of the winder. The embodiment of Fig. 2 may operate, if required, with only one transfer cylinder 14 as the arms 8 on the opposite sides of the winder are connected to each other via intermediate rods 16, levers 17 and an adjustment rod 18 which is disposed transverse under the winder. These means transmit a movement of the same size and direction as the movement of the arm 8, which is adjacent the cylinder 14, to the arm on the other side of the winder. The levers 17 are fixed by a rigid joint to the rod 18 and by an articulated or pivot joint to the bed 6 via a bracket 19. The decelerating apparatus 1 operates in the following way. When a jumbo roll 2 is completed the brake shoes 9, 11 of the decelerating apparatus 1 contact the outer periphery of the end of the reel drum 3 or the casing surface of the reel drum thus decelerating the rotation of the jumbo roll 2. This action rapidly causes a web loop to be formed which is guided to be wound around a new reel drum. Subsequently this the web is cut. At the same time and while decelerating continues, the transfer cylinder 14 is pressurized to pull the jumbo roll 2 away from the winder. Because the brake shoes 9, 11 are pivotally connected to the brake lever 10 and the arm 8, the jumbo roll 2 can roll along rails 5 on its bearing housings 4 while the brake shoes 9, 11 during the whole time thereof, sustain full contact with their counter surfaces. This operation minimizes the time required for a reel drum exchange and also reduces the amount of paper or board wasted during the deceleration phase. A most important feature of the apparatus according to the invention is that articulation or pivoting of the brake shoes 9, 11at the ends of the arms 8, 10 and the brake levers allows decelerating the jumbo roll already while it is being transferred. It is obvious to a person skilled in the art that the levers of the decelerating apparatus can be either by the inner or the outer side of the rails 5 or that either the casing surface of the reel drum 3 or the outer surface of a toothed coupling can be serve as the brake surfaces on the reel drum side. Further, if these surfaces for some reason can not be used as brake surfaces, it is possible to provide for instance specific friction surfaces, for example, on the outer surfaces of the toothed coupling, whereby the brake shoes would, of course, have no need for friction surfaces. The means 13 and 14 are in most cases pneumatic or hydraulic cylinders but they can be any means providing the same movement range. For example, the drive means 13 can in some applications be substituted by a lever arm articulated to the means 14 and connected to the brake lever 10, which produces the same operation as the means 13 in the described embodiment. Further the transfer cylinder 14 or the corresponding means can be used for handling of rolls of different size, i.e. rolls at different distances from the Pope cylinders (P). The so called "Pope cylinder" referred to herein is known in the art as comprising a roller cylinder, normally although not essentially, a water-cooled roller cylinder made of cast iron, which is rotated so as to create an appropriate tension between the winder and the paper or board machine and wherein the jumbo roll on which the paper or board is wound leans against the roller cylinder and is rotated at constant speed.

Claims: A method of changing a wound jumbo roll on a reel (3) of a paper or board winding machine, said machine including displaceable pressure means (20) which in use urge the reel (3) against a Pope winder (P) to form a wound jumbo roll (2), and including decelerating apparatus (1) provided with brake means (9, 11) which are activated to decelerate a wound roll upon release of the displaceable pressure means (20) from urging the wound jumbo roll (2) against the winder (P); said method being characterised by the steps of engaging the reel (3) of the wound jumbo roll with the brake means (9, 11) of the decelerating apparatus (1) when said reel (3) is still in the winding position, causing said pressure means (20) to release the wound roll (2), displacing the decelerating apparatus (1) with wound roll (2) away from the Pope cylinder (P) and along support rails (5) whilst at the same time continuing the braking action, displacing said displaceable pressure means (20) to engage and urge a further reel (3) supported on said rails (5) against the Pope cylinder (P) for further winding, and of decelerating the speed of rotation of the jumbo roll using a pair of brake shoes positioned opposite each other and pivotal on the transfer arms (8) on both sides of the reel machine in such a way that the brake shoes make full contact with the jumbo roll journals during the time that the arms (8) transfer the jumbo roll towards its removal position. An apparatus for changing a wound roll (2) and at the same time decelerating the wound jumbo roll (2) comprising a winder (P), displaceable pressure means (20) for urging a reel drum or reel (3) against the winder (P) and brake means (9, 11) for decelerating a wound reel (2) during displacement, characterised by a displaceable decelerating apparatus (1) being provided separate from said displaceable pressure means (20) and comprising displaceable transfer means (8) on both sides of the machine with each transfer means (8) including brake means (9, 11) which are actuable by a piston-cylinder arrangement (13, 14), said displaceable pressure means (20) being displaceable from urging the wound jumbo roll (2) against the Pope cylinder winder (P) so as to release said roll, and said displaceable transfer means (8) being engageable by said brake means (9, 11) with reel (3) of the wound roll (2) and displaceable away from the Pope cylinder (P) so as to displace, with continued braking, the wound reel (2) released by the pressure means (20) along support rails (5) of the machine whilst said displaceable pressure means (20) is controlled to be displaceable to urge a further reel (3) supported on said rails (5) against the Pope cylinder (P) for further winding, and wherein said displaceable transfer means (8) comprises an arm provided on each side of the machine, each arm having brake means each comprising two brake shoes opposite each other for gripping the jumbo roll journal between them in such a way that the pivotal mounting of one brake shoe (11) on each arm (8) and one shoe on a brake lever (10) on each arm (8) allows full braking force to be applied to the journals during the time that the wound reel is moved from the winding position to the removal position. A winding machine as claimed in claim 2, characterised in that each pivotable arm (8) has a displacing means (14) therefor, and that actuating means (13) for the brake shoe (11) on each brake lever (10) are provided for displacing said brake shoe (11) such that the braking action is a function of the pressure in the piston-cylinder arrangement. A winding machine as claimed in claim 3 characterised in that the actuating means (13) for displacing said one brake shoe (11) is provided between the brake lever (10) and the arm (8). A winding machine as claimed in claim 3 characterised in that the brake lever (10) is articulated to the arm (8); and that the actuating means (13) articulated to the displacing means (14) is connected to the brake lever (10). A winding machine as claimed in any of claims 3 to 5 characterised in that the outer surface of the end of the reel drum casing is used as a brake surface of the reel drum (3). A winding machine as claimed in any of claims 2 to 5, characterised in that the edge area of the reel drum casing is used as a brake surface of the reel drum (3). A winding machine as claimed in any of claims 2 to 7, characterised in that the brake surfaces of the reel drum (3) are coated with a frictional material. A winding machine as claimed in any of claims 2 to 8, characterised in that the actuating means (13) for displacing one of the brake shoes (9, 11) and the drive means (14) for displacing the transfer means (8) are hydraulic or pneumatic cylinders. A winding machine as claimed in claim 2, characterised in that the actuating means (13) for displacing one of the brake shoes (9, 11) includes a lever arm (10) and the displacing means (14) for the transfer means (8) is a hydraulic or a pneumatic cylinder. A winding machine as claimed in any of claims 1 to 11 characterised in that the displaceable decelerating means (1) includes drivably displaceable lever means (16) mounted so as to be displaceable between said support rails (5); and that the transfer means (8) are mounted to be displaceable outwardly of said support rails.

Inventors: SNYGG, KEIJO
Applicants: VALMET-KARHULA INC.
Application year: 1987
Main classification: B65H23
IPC codes: B65H23, B65H19