Abstract:
An apparatus for testing of electrical, mechanical, physical and/or chemical properties of material in sheet form includes a cassette for holding of sheets and sensors rigidly mounted relative to the cassette. The sensors may be mounted adjacent a test location exterior to the cassette. The cassette and the sensors may be so configured and positioned that a suitable end effector may move sheets of material between storage locations in the cassette and test locations adjacent the sensors. A method for testing sheet material includes the steps of placing the sheet material in a cassette, and conducting tests employing one or more sensors rigidly mounted with respect to the cassette. The method may include employing an end effector to remove the sheet from the cassette, to position the sheet stepwise in several positions relative to the sensors, and to replace the sheet in the cassette upon completion of testing. Materials to be tested include flat panels for computer screens and other applications and semiconductor wafers.
Abstract:
The force sensor according to the invention has a support, a first pressure-sensitive layer, arranged on a first side of the support and connected to a first conductor track, a first force-introduction part with a first contact area which is bounded by edges and is connected to the first pressure-sensitive layer in a first bearing region. A second pressure-sensitive layer, connected to a second conductor track, is arranged on a second side of the support, and a second force-introduction part with a second contact surface bounded by edges is connected to the second pressure-sensitive layer in a second bearing region.
Abstract:
A method and apparatus for measuring substrate bending stiffness and thereby basis weight on a real time basis. Provided is a corrugator having a plurality of parallel ribs, with one or more sheets of the substrate provided below the corrugator wherein a predetermined gap exists between a topmost sheet of the sheets and the corrugator. A vacuum is applied between the corrugator and the topmost sheet, wherein the vacuum is sufficiently large to raise the topmost sheet, thereby deflecting and bending it into a profile corresponding to the arrangement and size of the corrugator ribs and bending stiffness of the substrate. One or more sensors are provided for measuring the deflection of the topmost sheet. The vacuum, an air knife output and/or a fluffer output are then adjusted according to predetermined rules and the measured deflection.
Abstract:
An apparatus for testing the fatigue of a sample of cord or filament (12) by bending it over a fixed surface (19). The apparatus comprises a tensioner (14), a fixed bending surface (19) and a driving mechanism (24), whereby the driving mechanism (24) causes a non-twisting bending of cord or filament (12) over bending surface (19) while tensioner (14) maintains a constant tension on cord or filament (12). In a method of the invention, a cord or filament (12) is attached to a tensioner (14), the cord or filament (12) is mounted on fixed bending surface (19) and attached to non-stationary roller (20), and driving mechanism (24) is activated to cause a back and forth movement of roller (20), thereby causing filament or cord (12) to bend back and forth over fixed bending surface (19) until it breaks. This process is repeated using different stress increase rates on the cord or filament (12) by adjusting the tensioner (14) and a linear regression equation is used to determine the fatigue stress limit of the material.
Abstract:
A method and an apparatus for measuring a load of a hoisting apparatus, where electricity is used as the driving force and a squirrel cage motor as the hoisting motor for moving a load attached to a hoisting member of the hoisting apparatus substantially in the vertical direction. The method and arrangement are employed to determine air gap torque of the hoisting motor, which describes the load of the hoisting apparatus, utilizing magnetization flux of the hoisting motor determined on the basis of the current, supply voltage and stator winding resistance of the hoisting motor. The value of the air gap torque is compared with an air gap torque curve determined for the hoisting apparatus at known reference loads to determine the load that corresponds to the air gap torque in question.
Abstract:
Measuring system and process for determining properties of a running fibrous material web in a drying section of a machine producing the fibrous material web. The system includes at least one upper roll and at least one lower roll. The fibrous material web is arranged to partially wrap the at least one upper roll and the at least one lower roll and to run between these rolls at an angle between about 0 and 45° to a vertical. A sensor guide is arranged crosswise to a web run direction, and at least one sensor is arranged to traverse the sensor guide in the web run direction in a region of the at least one lower roll. The sensor is structured and arranged for determining a web parameter, and is oriented to form a maximum angle of about 60° to a horizontal through an axis of the lower roll.
Abstract:
A webbing tension sensing unit which includes a base and a cover and an elastically biasing element mounted within the base and cover. The webbing of, for example, a seat belt is operably connected to a sensor also housed within the base and cover. The sensor detects movement in relation to the elastically biasing element and generates electrical signals in proportion to the movement as a function of the tension in the webbing. The signals are used for analysis as part of a system to determine if devices such as an air bag or warning light should be triggered.
Abstract:
A take up apparatus 10 for drawn optical fiber comprises: a take-up stand 22 supporting a first, storage bobbin 12 about a first axis 20; a motor 32 for rotating this first bobbin about that axis; a supporting means 36 supporting a second, sampler bobbin 14 about a second, different axis 34; a second motor 38 for rotating this second bobbin about the second axis; and means for controlling the relative rates of rotation provided by the motors. In use drawn fiber is guided about the first bobbin to the second bobbin and the bobbins are rotated to wind the fiber about the first bobbin and onto the second bobbin during initial drawing of the fiber. Subsequently the fiber between the bobbins is cut and the drawn fiber is wound onto the first bobbin.
Abstract:
The invention relates to a measuring device for thread-like test samples (3), comprising a measuring slit (2) exhibiting measuring areas (6, 7) for measuring characteristics of a test sample which moves longitudinally, said measuring areas being associated to a measuring device. A coating (8) made of an abrasion-resistant material is applied over the whole measuring slit and its measuring areas (6, 7) in order to define more freely the dimensions of said measuring slit and especially to obtain a narrower measuring slit.
Abstract:
The invention relates to a method and apparatus for measuring the tension of a moving web. In the invention, a measuring beam (2)is curved so that a web moving over or under the measuring beam (2) forms an air cushion (3) of the air it transports between the measuring beam (2) and the web (1). The web (1) causes a force effect transmitted by the air cushion on the measuring beam (2). The tension of the web (1) is measured by measuring the force caused by the web (1) and transmitted by the measuring beam (2).