Abstract: A length measuring device for thread-like structures, especially textile threads, which are wound onto a cross-wound package or bobbin, possesses a substantially greater accuracy than heretofore known length measuring devices due to a more exact allowance for the geometric and kinematic relationships in the winding device. In particular, the slippage between the cross-wound package or bobbin and the winding drum can be taken into consideration in determining the length of the thread.

Abstract: The weft thread monitoring apparatus contains a detecting circuit incorporating the functions of a thread recognition circuit and a control circuit for controlling the intensity of a thread sensing or scanning beam which is affected by extraneous effects like outside light, the presence of fluff and other influences. A monitoring and controlling circuit defines monitoring and control intervals to differentiate between thread signals which are respectively correctly and incorrectly related to the operating cycle of the weaving machine and to possibly cut off the weaving machine. A sensing head can be simply mounted and dismantled at any desired location at the reed of the weaving machine so that different widths of the woven material or fabric can be manufactured using the same reed and the weft thread can be monitored. By periodic indication of the thread signal the correct run or operation of the weaving machine also can be monitored.

Abstract: The apparatus for measuring the length of filamentary material, such as a yarn or thread, wound-up at individual ones of a number n of winding or spinning locations in a textile machine cooperates with an electronic scanning or interrogation device. The latter monitors the thread run at the aforementioned locations by means of a number n of scanning heads. The apparatus is constituted by a series circuit comprising a shift register including a number n of parallel outputs, a number n of storage members, a number n of AND-gates, a number n of electronic counters, a comparator, a number n of electronic switches and a number n of relays, as well as a sensor detecting the number of revolutions of a drive element, and a reference or set value transmitter. When reaching a fixed number of revolutions inputted into the reference value transmitter, and thus, a distinct length of yarn or the like, the related winding or spinning unit is stopped by the relay associated therewith.

Abstract: The electronic scanner serves to monitor a multitude of thread running locations in a textile machine in which a measuring head for detecting a thread rupture or breakage, a bistable controller and switching means are arranged at each thread running location. A clock pulse generator acts upon the clock pulse inputs of the bistable controllers which are series connected and which interrogate or scan the measuring heads via the switching means in a cyclical sequence. The signals obtained from the measuring heads during interrogation or scanning are delivered to a counting circuit via a signal line and a clock-pulse controlled gate. The counting circuit indicates the thread running location associated with a thread rupture.

Abstract: During the measurement of the length of filamentary materials, for instance a yarn, which is wound into a cross-wound package which is driven by a grooved drum, appreciable errors arise because there is not taken into account slippage. Therefore, with the present method during the winding operation the slip, which is governed by the relationship of the circumferential velocities of the grooved drum and the cross-wound package, is continuously measured in successive time intervals, and there is undertaken a correction of the yarn length determined without taking into account the slip. Thus, sensors continuously measure the rotational speeds of the cross-wound package and the grooved drum, and an angle measuring device determines the diameter of the cross-wound package, these measuring results then being inputted to an evaluation circuit. In the evaluation circuit there is computed the slip and such is incorporated into the length measurement.

Abstract: An inductive projectile sensor on a gripper shuttle weaving machine or loom comprises a flat induction coil surrounding at least one of the guide teeth which are mounted on the lathe beam of the weaving machine to form a guide duct for the projectile when passing through the weaving shed. Means for magnetizing the guide tooth or teeth, such as a permanently magnetized small plate or lamella, are provided beneath the induction coil to form a magnetic core or bridge between two neighboring guide teeth, one of which is surrounded by the induction coil.

Abstract: Electronic control device on a gripper shuttle or projectile weaving machine or loom containing a lathe beam and thereto fixed teeth for guiding the gripper shuttle or projectile which inserts the weft or filling thread into the weaving shed, and a thread brake located at the picking side of the loom. The electronic control device comprises a sensor arranged on the lathe beam at least at one of the guide teeth and which furnishes an electrical sensor signal when the projectile passes by, an evaluation circuit connected to the sensor, and an electromagnetic device operatively connected to the evaluation circuit such as to actuate the thread brake upon appearance of an electrical sensor signal.

Abstract: An electronic device for monitoring the insertion or travel of the filling or weft thread on an air jet weaving machine or loom which comprises at least one air jet arranged at the picking side of the machine, and a lathe or sley beam with thereon fixed lamellae forming a reed. The device comprises a tactile weft thread travel sensor arranged at the weaving machine upstream of said air jet, a start pulse generator controlled by the weaving machine, an optoelectrical sensor located near the end of the reed adjacent the weft receiving means, and electronic circuitry controlled by said start pulse generator and optoelectrical sensor for producing an activating signal defining the time interval during which the weft thread travel is monitored.

Abstract: Equipment for continuously measuring the length of an endless material, such as a yarn, which is being wound up on a machine into a circular package, the machine comprising a movable member whose position depends upon the diameter of the package. The measuring equipment comprises a movable transfer member mechanically coupled to the movable member of the machine, and therewith cooperating photoelectrical sensing means for generating a sensing signal indicative of the position of the movable member at each revolution of the package. There is further provided electronic circuitry for continuously evaluating consecutive sensing signals and generating therefrom a digital signal representative of the length of the yarn wound up into the package.

Abstract: The electronic weft stop motion is designed for monitoring the weft thread in a last phase immediately following the weft insertion into the weaving shed when a thread tensioning device located on the picking side of the machine laterally deflects the weft or filling thread and thus holds it tensioned. A tactile thread sensor is arranged in the region of the lateral deflection of the weft thread in such a manner that the thread sensor goes free from the weft thread in the undeflected condition thereof, however is frictionally contacted by the weft thread when the latter is being laterally deflected.