Abstract:
An apparatus and method for tensioning a fabric in a paper machine, such as a press felt, a drying wire, or an equivalent fabric, including a tensioning roll arranged inside a loop of the fabric. Bearing supports of the roll are fixed, at the driving side and at the operating side of the machine, to sledges. These sledges are displaced by a motor, synchronously in relation to one another, so as to tighten the fabric that runs over the tensioning roll to a certain tension. The sledges are arranged in connection with the frame part of the machine on linear guides, which can be loaded in different directions transverse to the direction of movement of the sledges. In view of displacing the sledges, shafts operated by a motor are journalled on the sledges. The shafts are interconnected by a synchronization shaft between the driving side and the operating side.
Abstract:
A paper machine dryer group has a plurality of rolls, including a guide roll and a tension roll, and a carrier belt traveling over the rolls and forming a continuous loop. The guide roll can be displaced to a location parallel to its axis as well as at an angle to the direction of movement of the carrier belt. The guide roll and the tension roll are coupled to each other in such a way that, when the guide roll is displaced, the tension roll is simultaneously displaced in such a direction and to such an extent that the carrier belt tension remains at least approximately constant.
Abstract:
A conveying installation has least one endless conveyor belt guided via a plurality of rollers along a leading belt run for conveying material or products and a returning belt run, particularly for manufacturing a paper web with a wire belt or felt belt. At least one of the rollers has an adjustable mounting for adjusting and correcting a direction of movement of the conveyor belt. A tensioning unit for detecting and controlling a tension of the conveyor belt has a pressure-measuring apparatus disposed at the adjustable mounting. A movement correction unit for detecting deviations of a direction of movement of the conveyor belt from a correct movement and for correcting the movement includes a sensor that is disposed to monitor a lateral periphery of the conveyor belt. A sensor output of the sensor is used for adjusting the adjustable mounting of the one of the rollers.
Abstract:
A device serves to regulate the tension of a running belt. The belt is deflected on rollers of which one is designed as a force measuring roller and is connected to a displacement sensing device. This roller is provided with at least one force sensor that determines the force applied to the belt. In addition, this roller is position adjustably held by an actuating drive in order to be able to adjust the tension of the belt. The actuating drive is in an operative connection with a regulating device that is influenced by a correction device. This correction device determines the web tension from the force applied to the belt measured by the force sensor and from the position of the force measuring roller, that changes with the position of the tension regulating roller, and transmits this output as an actual value to the regulating device.
Abstract:
The invention relates to a device for the control of the tension of an endless belt or screen in paper handling machinery by providing a deflecting roller displaceable by two bearings guided in carriages.
Abstract:
A screen support rod for screen drawing into a paper machine, the screen support rod including a support tube made from carbon fiber composite material; a telescoping rod; and a bearing that supports the telescoping rod axially movable in an interior of the support tube, wherein the support tube includes a shrink tube that forms a surface that supports the screen during the screen drawing.
Abstract:
A dryer felt tension indicator apparatus is disclosed for indicating a value which is proportional to a tension applied between a frame and a stretcher roll for guiding a dryer felt. The value is proportional to a tension of the dryer felt. The apparatus includes a carriage for rotatably supporting the stretcher roll. A wheel is rotatably secured to the carriage and a tensioner having a first and a second extremity cooperates with and extends around the wheel such that the wheel is disposed between the first and the second extremity of the tensioner. A tension indicator has a first and a second end. The first end of the tension indicator is anchored to the frame. The second end of the tension indicator is secured to the first extremity of the tensioner such that in use of the apparatus, when the tension is applied to the tensioner between the wheel and the second extremity of the tensioner, the carriage and the stretcher roll rotatably supported thereon is moved relative to the frame for tensioning the dryer felt. The tension indicator indicates the value which is proportional to the tension of the dryer felt.
Abstract:
A paper or board machine has a fabric (10) that is adapted mobile as well as rolls (11, 11′) arranged to support the fabric (10). The fabric (10) is tensioned by changing the position of one roll (11′) of the rolls (11, 11′). Correspondingly, the fabric (10) is guided by changing the alignment of one roll (11′) of the said rolls (11, 11′). Surprisingly the fabric (10) is both tensioned and guided by changing the alignment and position of only one and the same roll (11′). In addition, the wrap angle of the fabric (10) at this roll (11′) is set higher than 30°.
Abstract:
A device (1) serves to regulate the tension of a running web (2). The Web (2) is deflected on rollers (6, 7, 8, 9, 15) of which one is designed as a force measuring roller (15) and tension regulating roller (18). This roller (15, 18) is provided with at least one force sensor (16) that determines the bearing force (F). In addition, this roller (15, 18) is adjustably held by an actuating drive (13) in order to be able to adjust the tension of the web (2). The actuating drive (13) is in an operative connection with a regulating device (21) influenced by a correction device (17). This correction device (17) determines the web tension from the bearing force (F) measured by the force sensor (16) and from the looping, that changes with the position of the tension regulating roller (18), and transmits this web tension as an actual value to the regulating device (21).