Abstract:
The present invention relates to a method and a device for two-shaft force measurement and its application to the determination of tensile force in a continuous web. The device comprises a force-introducing part (4) with two force-measuring parts A and B for determining the forces FA and FB, and the force is applied in a torque-free manner around a centre of force via a device (3), for example in the form of a deflector roll journalled in bearing brackets (3) placed on the force-introducing part, and wherein the force-measuring parts, due to their built-in design, measure forces FA and FB in directions directed through angles +/- phi from a mean measurement direction, and wherein the force-measuring parts A and B are placed at the same distance L on different sides of a plane parallel to the mean measurement direction and through said centre of force, and wherein the force-measuring parts A and B are placed at a distance h on the same side of a plane perpendicular to the mean measurement direction and through said centre of force.
Abstract:
An improved tennis racket string tension tester (10) of enhanced accuracy and convenient adaptability to rackets of varying configuration and string spacing. To provide for strings of varying diameter and grid spacing, a series of interchangeable washers (53) are provided which exactly fit a centrally disposed interstice (25) and a string grid (49) defined by two horizontal and two transversaly extending strings. Deflection of a known type strain gauge (31) is indicated by a liquid crystal readout (45).
Abstract:
A method of measuring tension in a moving strand (11, 21, 31) comprising the steps of: causing the strand to pass along a working path (X, P1) between first (A) and second (B) locations: directing across the strand at a predetermined position (P, 8, 14) a jet of gas (Q; Q'; Q1, Q3, Q2, Q4; F) to displace the strand (11, 21, 31) from the working path (X, P1) to a displaced path (ADB, D', P2); measuring the lateral displacement (H, D) of the strand (11, 21, 31) from the working path (X, P1) to the displaced path (ADB, D', P2); using the value of lateral displacement (H, D) and the distances (I1, I2) of the predetermined points along the strand (11, 21, 31) to the first and to the second locations to establish the tension (F) in the strand: characterised in that the velocity of the jet of gas (Q; Q'; Q1, Q2, Q3, Q4; F) is periodically varied. Typically the velocity of the gas jet is varied either by varying the gas flow speed through a nozzle (13; 2, 3; 2, 5, 3, 6; 16) defining the direction of the jet or alternatively the velocity of the gas jet (F) can be varied by varying the radial direction of the gas jet (F) relative to a predetermined location (14) on the working path (P1). The invention is further directed to apparatus for carrying out the method and product achieved by use of the method or apparatus.
Abstract:
A tension meter for determining the tension in belt (B) of transmission drive or a conveyor belt including a body (10), an elongate touch probe (14) projecting from the lower surface of the body. The touch probe (14) is coupled to a transducer (18) which detects any longitudinal displacement of the probe (14) from the extended position of the probe. The tension meter further includes a load cell comprising a ring (26) strain gauges (1, 2, 3 and 4), the strain gauges (1, 2, 3 and 4) being connected to a computer to compare pre-programmed belt characteristics with the belt being tested.
Abstract:
A measuring probe (MF) for an elongated product (LG) is arranged behing the supply reel (VS) of said elongated product (LG) viewed in the draw-off direction (AR).
Abstract:
Tension in continuous webs, particularly webs that are in motion (3) is measured by bringing an elastic sensor in contact with the paper web (3) and the displacement of an elastic sensor (4) relative to a fixed point of reference (10) is measured, the displacment being a measure of the web tension. An apparatus for the measurement of the web tension comprises a measuring head (1) equipped with at least one smooth surface of contact (2), and an elastic sensor (4) fastened to a head (1) and movable relative to the head, extending through an imagined plane touching a contact area (2) and a device (10) for the determination of the position of the elastic sensor (4).
Abstract:
Le dispositif de mesure de la tension d'un fil se deplacant presente une fente allongee (9) dans laquelle se deplace le fil (13), un haut-parleur (8) et un detecteur (10) sont disposes sur les cotes de la fente et connectes a un amplificateur (12).
Abstract:
The invention relates to a device for inductive force measurement, in which a measuring spring is used which consist of a tension-free spring steel plate (1). In one plane said spring is shaped as a three-pronged fork in such a manner that the two outer prongs are the fixable ground element (2, 2') and the central prong is a movable ground element (3). The bending point (9, 9') is in the region of the recesses (7, 7') outside the clamping zone. The measuring spring is suitable for thread force measurement on a moving thread.
Abstract:
The present invention relates to an apparatus for generating an electric signal corresponding to the tension and/or movement of a thread (1) which actuates a flexible element (12), with an active element (15) whose tension change is converted into a corresponding electric signal, the flexible element (12) which is in the form of tongue being, together with the active element (15), tensioned in a bracket (4) with the aid of a clamping device (14), and the active element (15) being coupled to a charging amplifier (19) which is disposed to be zeroised before each measurement cycle.
Abstract:
The apparatus for monitoring the tension in a vibrating flexible elongate member (4) includes a source of radiation (5) and a detector (8) for detecting radiation reflected from the flexible member. Variations in the intensity of the detected radiation arising from a variation in the path length of the detected radiation are sensed, and the natural frequency of vibration of the flexible member (4) is ascertained therefrom. The tension in the flexible member (4) is determined from the ascertained frequency value.