Abstract: A system for inserting a weft thread into a shed of an air jet weaving machine includes a thread store with a measuring apparatus, a plurality of air nozzles for the insertion of the weft thread and a control system which is connected to the measuring apparatus in order to be able to control the compressed air supply of the air nozzles in dependence on measurement values of the measuring apparatus. Switch-on points are associated with the air nozzles, with the control system charging one or more of the air nozzles with compressed air as soon as a predictor value for the position of the weft thread tip, which is formed with the help of the measurement values, reaches the switch-on point of the relevant air nozzle or air nozzles respectively.

Abstract: The invention relates to a method (1) for braking a weft thread (3) of a jet weaving machine (10), in said method (1) a braking element (2) being brought into contact with the weft thread (3), with the braking element (2) being moved by means of a drive (21) in accordance with a predeterminable distance/time plot so that the weft thread (3) is deflected by the braking element (2) in accordance with a position function (23), so that the weft thread (3) is braked in accordance with a braking profile (31), characterized in that the position function (23) is matched to the braking profile (31) of the weft thread (3).

Abstract: In accordance with the invention a method (1) for braking a weft thread (2) of a weaving machine (3), in particular of a jet weaving machine (3) is provided, in said method a braking element (4) is brought into contact with the weft thread (2) and the braking element (4) is moved via a control device (5) by means of a drive (6). In this arrangement, during a weft thread insertion (7) a first measurement value (8) of a movement parameter (9) of the weft thread (2) is determined, a first estimate value (10) for the movement parameter (9) is estimated on the basis of the first measurement value (8) and a correction value (11) is determined from it. The movement parameter (9) of the weft thread (2) is then corrected on the basis of the correction value (11).

Abstract: A method for monitoring the transport of a thread in a weaving machine is presented in which the thread includes thread sections (21, 21.i) which are transported with an associated speed (vi). In this method, values (24) of at least one kinematic measurement parameter of at least one thread section (21, 21.i) are measured and, based on the measured values (24), approximation values (25) of the tensile force which acts on at least one thread section (21, 21.i) are calculated by means of a computation model (2). The computed approximation values (25) are displayed for monitoring purposes.

Abstract: A method for monitoring the transport of a thread in a weaving machine is presented in which the thread includes thread sections (21, 21.i) which are transported with an associated speed (vi). In this method, values (24) of at least one kinematic measurement parameter of at least one thread section (21, 21.i) are measured and, based on the measure values (24), approximation values (25) of the tensile force which acts on at least one thread section (21, 21.i) are calculated by means of a computation model (2). The computed approximation value (25) are displayed for monitoring purposes.

Abstract: A system for inserting a weft thread into a shed of an air jet weaving machine (1) includes a thread store (21) with a measuring apparatus (23.1, 23.2), a plurality of air nozzles (3, 4, 5.1a-c to 5.na-c) for the insertion of the weft thread (2) and a control system (10) which is connected to the measuring apparatus (23.1, 23.2) in order to be able to control the compressed air supply of the air nozzles (3, 4, 5.1a-c to 5.na-c) in dependence on measurement values of the measuring apparatus (23.1, 23.2). Switch on points (xj) are associated with the air nozzles (3, 4, 5.1a-c to 5.na-c), with the control system (10) charging one or more of the air nozzles (3, 4, 5.1a-c to 5.na-c) with compressed air as soon as a predictor value (xF) for the position of the weft thread tip, which is formed with the help of the measurement values, reaches the switch on point (xj) of the relevant air nozzle or air nozzles respectively.

Abstract: With the measuring device movements are determined on a weaving machine (1). With this measuring device (2) digital signals can be produced at discrete points in time occurring in a periodic sequence by means of a positional determination of one or more identifiable points (31) which are located on a moved surface (30) and within a two dimensional measuring window (3) of the measuring device. These signals can be evaluated for determining an interval which can be associated with changes in position of the identifiable positions. Optical and electronic components (21, 22, 23, 20) for effecting pattern recognition are integrated in the measuring device. The identifiable positions can be defined by the pattern recognition. The positions of at least some of these positions can be determined at two sequential points in time of the said sequence. The interval associated with the changes in position can be calculated at each of the discrete points in time.

Abstract: The present invention pertains to the register coordination of cylinders of a web-fed rotary printing press which print on a web, wherein a first cylinder printing on one side of the web is driven by a first motor and a second cylinder printing on the same side of the web is driven by a second motor. An angular position of the second cylinder is coordinated with the first cylinder in good register by a controller. In the case of a change in a production condition, at least one controller parameter (kP, kD, kI, kf) of the controller is changed and the controller setting is adapted to the production condition as a result.

Abstract: The present invention pertains to the coordination in good register of cylinders of a web-fed rotary printing press which print on a web, wherein a first cylinder printing on one side of the web is driven by a first motor and a second cylinder printing on the same side of the web is driven by a second motor and the angular position of the second cylinder is coordinated with the first cylinder in good register by a controller. At least one disturbance variable (v) is sent to a command variable (u2.Soll) for the motor controller of at least the second cylinder to compensate a register deviation (Y12) of the second cylinder from the first cylinder, which register deviation is typical of the said disturbance variable (v).

Abstract: A method and an apparatus for the regulation of the warp let-off of a weaving machine is proposed, in that a desired speed of rotation (SD) is predetermined for a warp beam (2), in that a warp tension (K) of the warp threads (3) which are given off by the warp beam (2) is determined, in that the warp tension (K) is weighted with a weighting function (G) and in this manner a weighted warp tension (KG) is determined, in that a corrected desired speed of rotation (SDK) is determined from the values of the desired speed of rotation (SD) and the weighted warp tension (K), and in that the speed of rotation of the warp beam (2) is controlled in dependence on the corrected desired speed of rotation (SDK).

Abstract: The present invention pertains to the coordination in good register of cylinders of a web-fed rotary printing press which print on a web, wherein a first cylinder printing on one side of the web is driven by a first motor and a second cylinder printing on the same side of the web is driven by a second motor and the angular position of the second cylinder is coordinated with the first cylinder in good register by a controller. At least one disturbance variable (v) is sent to a command variable (u2.soll) for the motor controller of at least the second cylinder to compensate a register deviation (Y2) of the second cylinder from the first cylinder, which register deviation is typical of the said disturbance variable (v).

Abstract: A control device for controlling the tension of a paper web of a printing press is provided with a setting device for a speed master set point, with a speed controller for a drive motor, which is coupled with the setting device, with a setting device for a web tension set point, with a sensor for measuring the web tension, with a web tension controller, which is coupled with the sensor for measuring the web tension and with the setting device for the web tension set point. The speed controller is coupled with an output of the web tension controller.

Abstract: The method enables the dynamic running characteristics of diesel engines to be adjusted by use of a simulator via an electronic speed governor R for controlling the fuel pump injection. The method allows simulation of the number of cylinders and number of strokes of the diesel engine under adjustment, and variation of the torque curve of individual cylinders. It is also possible to test the running of the diesel engine and its governor (R) under load changes of the most diverse kinds, such as load reduction or complete or partial failure of a cylinder. The simulator includes blocks for generating signals corresponding to an injection pump setting, for simulating the torque curve or curves of the engine cylinders and integrating the generated torque signals including on-load torque and disturbance signals to form a speed signal. A voltage/frequency convertor converts the speed signal to a frequency signal for output to the electronic governor.