Abstract: A loom having a first drive motor (10), which for instance drives a batten (13), and having at least one second drive motor (44), which drives a dobby (46), is provided with a control and regulating device (48), which forms a rotational angle course for a virtual synchronization shaft of the loom and communicates such rotational angle course to respective control and regulating units (49, 51) of each of the drive motors (10, 44), which synchronize the drive motors in at least one angular position relative to the virtual synchronization shaft.

Abstract: A control technique is capable of adjusting a weight of a pile fabric by adjusting consumption of a pile warp at a proper range with a more simplified system. In a pile loom, a tolerance relative to a value associated with consumption of the pile warp is set, and the value associated with consumption of the pile warp is measured during a pile weaving period. If the value associated with consumption of the pile warp exceeds the tolerance, the weaving condition parameter associated with the weight of the pile is corrected in a direction to approach a target value of the weight of a pile fabric.

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: A method of controlling the easing motion (1) of a loom executes a position control operation and a tension control operation successively in one weaving cycle of the loom. The position of an easing roller (6) included in the easing motion (1) is measured in a position control period, a correction is determined according to the deviation of the measured position of the easing roller (6) from a desired roller position, and a controlled variable is corrected by using the correction to make the actual position of the easing roller (6) approach the desired roller position.

Abstract: A pile warp tension control method uses a pile warp tension control device capable of adjusting the tension of pile warp yarns according to a weave on a pile fabric loom. The pile warp tension control method involves setting a first pile warp tension amount for a pile weave section weaving mode for use in weaving a pile weave section, and setting second pile warp tension amounts for ground weave section weaving modes, respectively, for use in weaving ground weave sections, where the second pile warp tension amounts are higher than the first pile warp tension amounts. The control method further involves gradually increasing the tension of the pile warp yams from the first pile warp tension amount toward a selected one of the second pile warp tension amounts in a predetermined period after the change of the operating mode of the pile fabric loom from the pile weave section weaving mode to the ground weave section weaving mode.

Abstract: A process and apparatus for weaving a fabric with a three dimensional bulging zone, which is formed by increasing the density of the crossing points of the warp and weft threads so as to naturally impart a bulging zone in the fabric. The density is changed by changing the number of threads and/or changing the weave pattern. The lengths of the warp threads can also be increased in the bulging zone. In a preferred embodiment, the threads include a material which is settable by thermal or chemical treatment, and such that upon being set a three dimensional rigid matrix is formed which includes the non-settable threads as a reinforcement. The apparatus for carrying out the process takes the form of a loom having the capability of individually drawing off selected lengths of the warp threads from a warp supply, and a jacquard head for forming the weaving sheds and which has a control for changing the number of threads woven and/or the weave pattern.

Abstract: A yarn feed gearbox control system for controlling the let-off speed of a yarn feed gearbox. The control system is adapted for use with a warp knitting machine having a main shaft and a gearbox operative to control the feed rate of yarn delivery from a yarn beam, the gearbox including an adjustment spindle extending therefrom. The control system includes a yarn feed rate detector which measures the rate of yarn delivery from the beam, a computer which receives yarn feed rate signals from the yarn feed rate detector and generates control signals corresponding thereto, and a control device which controls the speed of rotation of the spindle in accordance with the control signals. The control system may be further provided with a main shaft detector to measure the speed of rotation of the main shaft of the knitting machine. The control system may also be provided with a beam revolution detector to generate a revolution signal corresponding to each revolution of the yarn beam.

Abstract: An arrangement for driving a warp beam employs a stepless adjustable drive (7) whose coupling element (8) is displaced by a setting member (11). The setting member (11) is controlled-by a computer (10) which provides an input arrangement (17) for the take-up of data of a predetermined thread provision (F); as well as data on the machine, the stepless adjustable drive (7) and the beam (3). The data includes a wind variable size (actual wind number w.sub.a), and data characterizing the actual wind circumference (U.sub.a). The computer has a calculating segment (18) and an output (19). With such an arrangement, the coupling element (8) can be brought into the correct target position, even before the start of the machine. The computing means can also serve as part of the control arrangement during the running of the machine.

Abstract: An apparatus for controlling the drive mechanism of the warp beam of a warp knitting machine is disclosed. A pressure roll is carried by a support arm biased toward the warp beam so that the pressure roll engages the warp beam. The pressure roll is operatively connected to a signal generator which emits signals representative of the speed and thus, the amount of yarn withdrawn from the warp beam. A controller receives the generated signals compares the signals to a predetermined knitting machine operating standard. A control signal is generated to the warp beam drive mechanism for controlling the speed of yarn delivery from the warp beam.

Abstract: A control method for a weaving machine comprises the steps of obtaining the rotational frequency to be varied by the use of the fuzzy interference on the basis of the evaluation index representing the running condition level of the weaving machine, and then varying the actual rotational frequency of the weaving machine on the basis of the obtained rotational frequency. As the evaluation index, use is made of the control allowance level of the weaving machine, the quality allowance level of woven fabric, the working allowance level of the operator, the stop level of the weaving machine, the rate of a change value of the stop level to a variation value of the rotational frequency or the operating rate of the weaving machine.

Abstract: The warp beam and/or cloth beam of a loom is driven by a programmable stepping motor. The speed of the motor is regulated, preferably in such a way that the tension of the warp threads remains constant. Improved tension control is obtained by further programming the motor to take into account the type of weave in the fabric being produced. This is accomplished by inputting information pertaining to the distance covered by the warp threads between their intersections with neighboring weft threads.

Abstract: A method of controlling an operating speed of the loom for increasing the production rate by varying the present operating speed so as to be increased includes a step of estimating a stop rate at the final point of time during a predetermined period at a certain time during the predetermined period, and comparing the estimated stop rate with a predetermined limit stop rate, and setting the present operating speed to increase it when the estimated stop rate is less than the limit stop rate and to decrease it when the estimated stop rate exceeds the limit stop rate.

Abstract: A terry loom having a negative pile warp let-off motor is electronically controlled to produce terry having uniform pile-to-ground warp ratio. The negative pile warp let-off motor is controlled to dispense pile warp yarn at a rate which yields the desired pile-to-ground warp ratio regardless of the tension on the pile warp yarn. The desired rate of pile warp let-off may be provided to the loom controller as a known quantity or may be calculated by the loom controller based upon the known desired pile-to-ground warp ratio and a measured or preset ground warp let-off rate. The desired pile warp let-off rate is compared to the actual pile let-off rate, and a signal is generated based upon deviations between actual and desired pile warp let-off rates, to control the pile warp let-off motor. Simplified control with uniform pile-to-ground warp ratio is thereby provided.

Abstract: A pile warp tension controller for controlling the pile warp yarn tension control mechanism of a pile fabric loom controls the position of the tension roller of the pile warp yarn tension control mechanism or the torque acting on a tension lever supporting the tension roller according to the operating state of the pile fabric loom so that the tension of the pile warp yarns is regulated at an optimum value. The control mode of the pile warp tension controller is changed over from a tension control mode to a speed control mode in forming loops of the pile warp yarns to ensure the satisfactory formation of loops having a predetermined loop length and to prevent defective loops.

Abstract: A method for starting the operation of a loom always under a constant warp tension after the completion of the amendment of faults in the woven fabric such as miss-pick. A warp beam in the stationary loom is rotated by a commmand signal from a control unit in the normal or reverse direction so that the preset tension can be attained. As a result, a weaving bar which often occurs in the prior art just after the loom has restarted due to disturbance of gear ratio of the speed changer during the transient state can be avoided.

Abstract: A method of regulating the tension of warp yarns in a weaving machine is disclosed herein. Displacement of a tension roller, which is movable with a change in warp yarn tension, from a reference position corresponding to an optimum tension of the warp yarns in the weaving machine is detected by a sensor, which then converts such mechanical displacement of the tension roller into electrical signals proportional to the amount of said displacement. The signals are sampled successively in synchronism with the operation of the weaving machine. Adjustment of the speed at which a warp beam is rotated is made depending upon the data from sampled signals in such a way that the speed is decreased when the tension is dropped beyond the lower limit of a predetermined range, while it is increased when the tension is built up to exceed the upper limit thereof.

Abstract: An apparatus for controlling a let-off motion in a loom having a let-off motion motor includes a tension detector for detecting a warp tension to produce a tension correction signal, a control unit responsive to the tension correction signal for producing a speed signal, a driving amplifier for controlling the let-off motion motor in response to the speed signal, a warp coil diameter detector for issuing a warp coil diameter correction signal inversely proportional to the diameter of a warp coil on a beam to the driving amplifier, and a normal-reverse rotation control unit responsive to the warp coil diameter correction signal for selectively applying prescribed normal- and reverse-rotation signals dependent on a rotation command to the driving amplifier. With this arrangement, the motor is rotated at a desired constant speed for feeding out or rewinding the warp yarn for a desired length irrespectively of the warp coil diameter.