摘要:
In a control mechanism for automatically operating a warp beam in a loom, a comparison regulator is associated with a thread guide roller over which the warp passes and the regulator, through a cam arrangement, operates micro-switches for controlling the operation of an electric motor. The electric motor drives the warp beam through the medium of a variator. Further, an automatic zero setting is associated with the warp beam and operates in cooperation with the variator.
摘要:
A process for the continual comparison of the actual-value relationship with the target-value relationship of the wound diameter of a warp beam and the number of revolutions executed by said beam, said values being continually transmitted. There is also provided a warping arrangement for the foregoing procedure in which the warp sheet path to the driven warp beam is provided with a turning roller, and comprises a measuring arrangement for transmitting the warp beam diameter and a rotation counter. The object of the invention being to provide in a simple manner, a number similarly wound beams. Thus, without the intermediation of a thread tension measuring means, the difference between the actual-value relationship and the target-value relationship is continually evened out by control of the feed speed of the thread sheet that the driven turning roller is provided with a slip-preventing circumferential surface.
摘要:
A method for operating a workstation (1) of a yarn balloon forming textile machine, wherein a yarn balloon (B) formed by a continuous yarn (5) circling a spindle (2) of the workstation (1) is scanned with a sensor means (33) at said workstation. Data (D) recorded by the sensor means (33), providing information about the current diameter of the yarn balloon (B) to be monitored, is transmitted to a control circuit (18), in that the control circuit (18) calculates the current actual diameter of the yarn balloon (B) by means of this data (D) and further known data, compares this with a stipulated target diameter of the yarn balloon (B), and in that the control circuit (18) ensures that the yarn balloon (B) has the stipulated target diameter with the aid of a means (6) switched into the yarn path of the yarn (5), for influencing the yarn tension.
摘要:
In a warping machine, once a temporary feed speed for a warping reed is set in synchronism with the speed of rotation of the warping drum, the winding thickness of the warp lap is detected several times and the feed speed is corrected depending on the number of revolutions of the warping drum and the winding thickness that results therefrom. The winding of the warp lap is then completed at the corrected feed speed. During a starting phase, a theoretically correct feed speed for at least the first revolution of the warping drum is derived from warp parameters, such as the total number of threads, the width of the warp and the yarn count. The winding thickness of the first warp section is continuously and contactlessly measured during a learning phase that follows the starting phase, or during the starting phase. For that purpose, a winding thickness measurement arrangement is held at a predetermined, substantially constant distance from the surface of the warp layer that has just been wound. The winding thickness is determined from the signals produced by the winding thickness measurement arrangement and the feed speed is regulated on the basis of the winding thickness on the second revolution of the warping drum at the earliest, from after the learning phase is finished. The regulated feed speed is stabilized in a working phase and a constant feed speed for the rest of the warping process is determined from the latest data obtained.
摘要:
In a textile warping system having one or more driven yarn engaging or yarn winding rolls, e.g. a driven warp beam, braking of each driven component is controlled by an individual pneumatic brake operated by a central programmable logic control system to brake the driven component according to a predetermined relationship of decreasing speed to elapsed braking time.
摘要:
The yarn crossing device of a sectional warping machine has a height adjustable cross reed (16), two guide rods (28, 29) which are able to slide in opposition to each other, as well as a horizontally displaceable leasing device (34, 35). Drive motors (22, 33), which are independent from one another and separately controllable, are allocated at least to the cross reed (16) and to the guide rods (28, 29). Preferably a separate drive motor (38) for the leasing device and a cross-wound motor (17) for the oscillating motion of the cross reed (16) is also provided. The independent drive motors make possible automation and programming of the different operational sequences which are necessary for the formation of yarn crossings or the rectification of breakages.
摘要:
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.
摘要:
In a textile draw warping system having independently driven sets of draw rolls and an independently driven warp beam, synchronous braking of the driven components is controlled by individual pneumatic brakes at each driven component operated by a central programmable logic control system to brake the driven components at respective rates of deceleration preset to maintain constant speed ratios between the driven components during braking. Auxiliary control of dynamic braking and driving of the several drive motors corrects deviations in the driven components' predetermined rates of deceleration.
摘要:
In the process for the control of the warp speed during direct warping, the winding diameter is determined by a contactless measurement. The actual thread speed is determined from the winding diameter and the current warp beam rate of rotation. A direct warping machine for carrying out this process has a transducer for measuring the winding diameter. This transducer is located proximate to but not in contact with the circumference of the winding for measuring the winding diameter. Also included is an arrangement for the determination of the rate of rotation of the warp beam. Also, a computer can calculate the thread speed from the above outputs that correspond to winding diameter and rate of rotation.