Abstract: The brake components of a clutch brake combination in an automatic high speed loom are periodically cleaned to avoid delays in the brake action that occur following a prolonged loom operation without a stopping. The stopping signal is either derived from randomly occurring events or criteria such as a weft breakage or similar criteria on the one hand, or when a criterium stored in the memory or program of the loom control occurs. The respective control signal is generated in response to whichever criterium occurs first.

Abstract: A drive device for a weaving machine has a motor control unit connected to an asynchronous motor. An electric supply network supplies the motor control unit with electric power which the motor control unit converts to have a substantially higher frequency. This higher frequency power is then supplied to the asynchronous motor causing the motor to operate at a high r.p.m. A speed reducing unit is connected between the motor and a drive shaft of the weaving machine. The speed reducing unit reduces the r.p.m. of the motor and the motor drives the weaving machine via the drive shaft at the r.p.m. of the weaving machine.

Abstract: A weaving machine in which the weft is inserted by two grippers into a shed from opposite sides of the machine and the pick being beaten by a reed carried by a batten. The grippers and the batten are controlled by electrical motors supplied in parallel by one or more frequency converters and are linked together by a synchronizing mechanism.

Abstract: A Jacquard weaving machine includes a weaving apparatus and a Jacquard apparatus, which are both connected to one another for the transmission of torque via a mechanical transmission device and are driven by a common motor. An additional drive device is provided which acts at least on the Jacquard apparatus. An angle sensor is provided for the measurement of an angle of rotation and/or a torque sensor is provided for the measurement of the torque present between the weaving machine and the Jacquard apparatus. The sensors are connected to a control device that controls the drive device in such a manner that peak values in the torque and/or fluctuations in the speed of rotation are reduced.

Abstract: In an electric shedding control apparatus, shedding patterns are stored in memories in such a manner that the shedding patterns are compressed and the time required to read the shedding patterns is shortened. An electric shedding apparatus is provided for driving each of a plurality of heddle frames independently and in synchronization with a rotation of a main shaft of a loom. Constituents of the shedding operations are set in advance, and the constituents are selected for each shedding step. Also, in order to drive the heddle frame, shedding amount instruction for the heddle frame is output in accordance with the rotation of the loom main shaft based on a shedding curve which includes the selected constituents.

Abstract: An electronic fast-starting system for a textile loom in which an asynchronous driving motor, whose phase windings are triangularly connected, is mechanically connected to the main crank shaft of the loom and is controlled by an inverter/controller receiving not only the set speed value but also the outlet signal of a speed detector situated on the main crank shaft.

Abstract: In a shed-forming system of a weaving loom the drive shaft thereof is driven by an independent motor with controlled variable input which will depend upon the weaving program, the current forces on the components of the shed-forming system and constant forces inherent in the shed-forming system operation and by a second input shaft which synchronizes the drive shaft with the principal drive shaft of the loom.

Abstract: A loom drive comprising a drive motor (1) connected by a gear unit to first driven components (20) and to second driven components (23), a switching gear (15) being mounted inside the gear unit and being displaceable into different switch positions in such manner that in one switch position the main drive motor (1) drives the first and second driven components (20, 23) and that in another switch position the drive connection to the first or second driven components (20, 23) is interrupted.

Abstract: A weaving machine having a rotating main shaft for driving the weaving machine, with a plurality of accessories on the weaving machine for weaving cloth is provided with an artificial signal of shaft position. A generator generates the artificial signal representing the desired angular position of the main driving shaft of the weaving machine. This generator generates the signal independent of actual angular position of the main shaft. A drive drives the main shaft of the weaving machine. The drive is responsive to the signal for the desired angular position of the main shaft. This drive responds independently of the actual angular position of the main shaft of the weaving machine. At least one weaving machine accessory is present for performing functions on the cloth being woven, such as a thread tensioning device, cloth takeoff device, or nozzle controls, for projectile-type weft insertion. These accessories also receive the artificial signal of desired shaft position, and function responsive to the signal.

Abstract: A doffing mechanism wherein a cloth roll doffer (C) is normally carried in aligned laterally spaced relation to the cloth roll with a motor which are actuated by manually raising the cloth roll engaging means to forcefully move the cloth roll engaging means for doffing the full cloth roll into a cart positioned beside the takeup rolls for receiving and carrying away the cloth roll. A DC motor (E) drives the takeup, and a DC motor control has a bridge rectifier (F) in an armature circuit of the DC motor supplying full armature current to the motor during doffing.

Abstract: An apparatus and method for actuating a drive member in a weaving machine comprises a drive unit, connected to a power supply network, for controllably rotating the drive member. The drive unit includes a direct-current operated unit selectively operable both as a direct-current motor and as a direct-current generator. A control unit is provided for generating and supplying to the drive unit at least one control signal for substantially continuously controlling the angular velocity of the drive member in each of its revolutions. According to the present method the control signal further selectively controls the drive unit to operate in first modes where the drive unit operates as a direct-current motor and in second modes where the drive unit operates as a direct-current generator.

Abstract: A loom equipped with a leveling motion incorporated with a cam-operated type shedding motion. The loom is provided with a control unit to control a variety of operations of the loom. Upon stopping of the loom weaving operation in response to a loom stop signal, the control unit judges that a loom stop time required for recovering a failed condition is longer or shorter than a predetermined time in accordance with the type of the loom stop signal which is different depending upon the cause for which the loom weaving operation is stopped. If the result of the judgement is that the loom stop time is longer than the predetermined time, the leveling motion is operated to level warp yarns at the level near a warp line, thereby loosening the tension applied to the warp yarns.

Abstract: A control system for a plurality of tuck-in selvedge forming devices in a loom having a variable reed beat-up position includes a main shaft, a drive shaft connected to all the tuck-in selvedge forming devices, a modulator driven by the main shaft and having an output shaft which pauses at least once during each revolution of the main shaft, as well as a coupling unit rotatable with the drive shaft and operative to be selectively rotatably coupled to the modulator output shaft so that the drive shaft is driven by the main shaft. The coupling unit includes a ring fixed to the drive shaft and a first cover pivoted to the ring so that a key can enter into the recess of the modulator output shaft to rotatably couple the coupling unit to the modulator output shaft during its pauses. A second lever is biased so as to follow contours of a control cam and prevent the first key from entering the recess of the modulator output shaft.

Abstract: A drive system for a weaving loom includes at least one four-pivot three-link drive or preferably two such drives for transmitting drive power from a main loom shaft through a cam drive to a slay shaft coupled to the cam drive through the four-pivot three-link drive. The use of two four-pivot three link drives permits operating the weaving loom selectively for producing terry cloth and/or smooth fabric. Each of the four-pivot three-link drives (DL, DR) has four pivots or journals (A, B, C, D) and three links (24, 38, 43; 25, 40, 44). Each four-pivot three-link drive cooperates with a roller carrying cam follower (15) that is controlled by an eccentric cam assembly (7). Both four-pivot three-link drives effectively operate the slay shaft (46) of the loom. A control and engagement mechanism (33, 54) provides for the switching from one four-pivot three-link drive to the other and vice versa, whereby a switch-over from the production of one type of fabric to the other is facilitated.

Abstract: When a faulty weft thread must be removed after it has been bound into the fabric and beat-up, it is necessary to perform a so-called reverse weaving operation following the stopping of the normal weaving operation in response to a stop signal signifying that a faulty weft thread has been detected. For this purpose the loom main shaft and the heald drive shaft are rotated for a number of rotational degrees in the same direction in which these shafts are rotated just prior to the stopping of a weaving operation in response to the above mentioned signal. Next, the drive between the main shaft and the heald shaft is interrupted. Next, the main shaft and thus also the reed shaft and with it the reed, are rotated back within a predetermined angular range between two successive reed beat-up motions. During this time the heald shaft is rotated back, preferably to the so-called detection point with a higher r.p.m., or rather with a higher angular speed than the main shaft.

Abstract: A device for automatically varying, during the transient states following loom stoppages, the shed vertex position in the loom. The device consists of a sensor for determining the beat-up pulse intensity of the loom reed. The device also is connected to a comparator which receives a predetermined set value corresponding to the beat-up pulse intensity of the reed during normal operation. The output of the comparator is used, through a control unit, to synchronously drive the electric motors that operate the beam and the take-up roller of the loom, respectively.

Abstract: A gear drive for shuttleless looms has an input transmission train and an outpost transmission train cooperating for converting the continuous rotational movement of the main loom drive shaft into an oscillating back and forth movement which in turn is converted into a horizontal back and forth movement of the respective gripper rod carrying a gripper head back and forth into the loom shed. The output transmission section or train has two auxiliary parallel output drive shafts, both of which are driven from a central output drive shaft. Two pinions at the free ends of the auxiliary parallel drive shaft mesh with the gripper rod, thereby distributing the drive forces over a larger surface area for reducing the wear and tear on the gripper rod and on the two parallel output drives.

Abstract: A method of restarting a loom after an interruption in the weaving process. A cloth fell (15) is moved from an operative or beating position (15) to a second position (15') away from a sley (4). The weft yarn is prevented from being fed into a shed (20) and the loom is then driven in a idling motion for a number of weaving cycles. A shed forming motion 3 and at least one of the warp let-off motion 10 and the cloth take-up motion 12 are driven independently of the predetermined weaving program. When the loom has reached its original dynamic operative state and the warp threads are at the original operative tension, the cloth fell is advanced to the beating position of the sley and the loom is restarted according to the predetermined weaving program. This method prevents visible points of start from occurring in the fabric because of the interruption in the weaving process.

Abstract: A method for driving a weaving machine during slow motion includes the steps of carrying out the slow motion drive using the main drive motor, and controlling excitation of the main drive motor as a function of the load on the weaving machine parts which has been predetermined and stored in a memory as a function of weaving machine part positions. The required speed of the weaving machine parts to be driven may also be taken into account in controlling the main drive motor. A device for carrying out the method includes the main drive motor, a power phase controller for the main drive motor, detectors for detecting the positions of the weaving machine parts, and a comparator for comparing the positions with stored positions in order to take into account the load data which has been entered.

Abstract: A split loom with a stationary loom part and a removable loom part includes selvage-formers mounted in the removable loom part, at least one selvage-former being driven by a shaft entering the loom and also mounted on the removable loom part, the shaft being connectable by a separable clutch to a drive shaft mounted on the stationary loom part.

Abstract: A loom speed controlling apparatus includes a counter adapted to output a current pick number, a data memory for storing the maximum allowable loom speed values depending upon physical characteristics of various filling yarns in correlation with pick numbers, and a discriminator for determining a target rotational speed of a driving motor for the loom in accordance with the current pick number supplied from the counter and data supplied from the data memory. An indexing signal generator is connected to an input of the counter and an inverter for variable-speed operation of the loom driving motor is connected to an output of the discriminator and the index signal generator includes a plurality of proximity switches adapted to be disposed close to a loom spindle and the indexing signal generator.

Abstract: A shedding controlling apparatus for a loom wherein each of a plurality of heald frames is driven by a drive motor for the exclusive use therefor. During steady operation of the loom, when a crank angle is inputted to a position instructing section, the position instructing section produces an aimed amount of rotation, and a position controlling section controls the drive motor to rotate in accordance with the aimed amount of rotation to eliminate a deviation thereof from a crank shaft of the loom to establish a synchronized relationship between them.

Abstract: An assembly for controlling the reciprocating movement of the upper and lower frames of a shed-forming device of a weaving loom wherein on the chassis on either side of the shed-forming device two cams are provided which are each in engagement with the end of an offset lever fitted on a shaft to which is connected a balance beam. The ends of the balance beam are connected to the first ends of two connecting rods which have their other ends articulated to first and second rocking levers. The first rocking lever is split having oppositely oriented spaced arms which are separated by the second rocking lever. The first rocking lever is fitted on a pin pivoting in a bearing on the chassis. The second rocking lever is mounted to rotate about the pin of the first rocking lever and the first and second rocking levers are connected to the upper and lower frames by short and long articulated levers.

Abstract: In a weaving loom, an assembly for controlling the reciprocating movement of the upper and lower frames of the shed-forming device which assembly includes a shaft of which the ends are each associated with the ends of two connecting rods by way of eccentrics and which connecting rods are articulated on rocking levers whose arms are pivotally associated with short and long levers attached respectively to the upper and lower frames of the shed-forming device.

Abstract: A picking control device for a loom comprising a pressure controller for controlling jet pressure of a picking nozzle, a timing controller for controlling operation time of a picking member, angle corrector for correcting the start angle of the weft yarn and a condition setting section which is operated on the condition that one of the signals from the pressure controller or angle corrector is not present so that at least one of the jet pressure, start angle or speed of the loom is maintained at an optimum value. This allows for effective picking with adequate air consumption and helps to prevent weaving defects such as cutting of the weft yarn at the time of termination of picking, warp engagement and the like.

Abstract: The starting or restarting of a power loom is controlled through a loom control system which controls the operation of a flywheel mass and the operation of the main electric motor of the loom. The control system ascertains the standstill time and the cause for the standstill, as well as the type of weaving binding that was employed at the time of the shut-down. These parameters are processed in a micro-processor which produces a respective result signal and uses that signal for the selection of a suitable start-up or run-up program. These programs are stored in a program library or memory. The micro-processor controls the run-up in response to the selected program, whereby conventionally occurring faults in the woven fabric are avoided. Even fabric faults caused by a standstill, are avoided.

Abstract: Drive system for the knife grids of a double-lift open-shed Jacquard machine, which is mounted entirely above the Jacquard machine, and which comprises a central drive shaft which at both ends drives a set of conjugate cams which imparts motion to two follower levers which lie diametrically opposite each other. These follower levers carry out a to and fro pivoting movement in opposite phase to each other, about a transverse axis of symmetry, in between their arms. With each pair of follower levers two knife suspension bars are connected to said arms by means of drive rods in such a way that they move up and down in vertical, parallel planes in opposite phase to each other. A number of knives are suspended in the weft direction on every two knife suspension bars moving in phase, which are situated on either side of the machine in the warp direction. The lift and the inclination of the knife suspension bars are adjustable.

Abstract: A loom for fabrics which are sensitive to loom stopping marks, especially twill fabrics, has a disengagement lever (14) on an eccentric drive mechanism of the loom. The disengagement lever is operated by a controlled driving device, so that it causes all heald frames or shafts of the loom to assume a central shed position when the loom is stopped. Thus, stoppage marks in the fabric are avoided since the heald frames no longer stretch the warp threads during a loom stoppage since the frames are moved to a closed shed position during stoppage.

Abstract: A weaving machine of the type in which a main shaft is braked by an electromagnetic brake has, in addition to the brake, a lock for locking the main shaft against rotation. The lock includes a locking element which meshes into gear teeth of a wheel coupled to the main shaft. The lock is automatically activated when power to the weaving machine fails, and may be deactivated by turning a hand wheel.

Abstract: A weaving installation includes a weaving machine and a dobby which can be driven by the weaving machine. In order for the weaving machine to drive the dobby, the weaving machine may be provided with a pulse generator for the transmission of pulses to a control unit which, in turn, regulates a motor coupled to the dobby. Alternatively, the camshaft of the weaving machine may be provided with an extension which is directly connected to the dobby. The dobby may also be driven independently of the weaving machine. In the case where the weaving machine has a pulse generator which controls a motor coupled to the dobby, this is accomplished in that the motor is operable even in the absence of pulses from the pulse generator. In the case where the camshaft of the weaving machine has an extension which is directly connected to the dobby, the dobby can be driven independently by a planetary gear on the extension.

Abstract: A method of measuring the yarn density of a woven fabric or the stitch density of a knitted fabric by recording a video image of the woven or knitted fabric to be examined by means of a video camera, converting the video image by an analog-to-digital converter into digital video information, storing the digital video information in a digital image memory and converting said information by a central processing unit into the yarn density or stitch density. The digital video information is converted by a digital band filter (14) with central circle frequency (.omega..sub.o) into a yarn or stitch density, and that the digital band filter (14) is arranged in such a manner that it operates according to the formula:Y.sub.k =A.sub.m .multidot.X.sub.k-m +A.sub.m-1 .multidot.X.sub.k-m+1. . . +A.sub.o X.sub.k -B.sub.1 .multidot.Y.sub.k-1 -B.sub.2 Y.sub.k-2. . . B.sub.n Y.sub.k-nwherein:X.sub.k represents a series of points of the digital information characteristic at interspace T before the digital filtering; Y.sub.

Abstract: A warp transfer control system for a loom, includes a first actuator for varying a warp let-off speed, a second actuator for varying a fabric take-up speed to change a filling density, and a control unit which has a take-up control section for controlling the second actuator, a feedback control section for controlling the let-off speed through the first actuator when no change is required in the filling density, and a feedforward control section for changing the let-off speed so as to improve an appearance quality of a fabric when the density is changed. When a change from a first filling density to a second density is required, the feedforward section first changes the let-off speed excessively from a first let-off speed corresponding to the first density beyond a second let-off speed corresponding to the second density, and holds the let-off speed at such an excessive level for a limited duration.

Abstract: A double-clutch coupling for looms, which comprises a first controllable clutch coupling a drive shaft connected to a first member of the loom to a driven shaft connected to a second member of the loom, movable in synchronism with the first and coaxial with the drive shaft. A second controllable clutch couples the driven shaft to an auxiliary motor device. The clutches are equipped with respective actuating electromagnets acting in opposition to springs. The clutches each comprise an annular electromagnet rigidly connected to a fixed support shell inside which the drive shaft and driven shaft are supported with their axes in a fixed position. The electromagnet is at least partly contained by a rotor axially fixed with respect to it and linked with the magnetic flux generated by the electromagnet itself when it is energized. In front of each rotor there is an annular armature, axially movable under the action of the magnetic field generated by the relevant electromagnet in opposition to the spring.

Abstract: A drive system for weaving machines includes normally coupled main and auxiliary drive shafts for at least the batten and heddles of the weaving machine, respectively, with the shafts driven by main and auxiliary drive motors at different speeds through appropriate speed reducers and couplings. The shafts are coupled together at one point by an adjustable coupling that is controllable remotely so as to permit fine adjustment between the relative angular positions of the main and auxiliary drive shafts and therefore between the batten and heddle positions. This system has particular application during weaving machine start-up after a weaving interruption; e.g., when a thread break occurs. Various embodiments are described.

Abstract: A method of removing a mispicked weft yarn when a mispick occurs in a loom. The operation of the loom in a state where the mispicked weft yarn is connected to weft inserting means after the mispicked weft yarn is beaten up by a reed. The mispicked weft yarn is exposed at the cloth fell of a woven cloth. A weft yarn connected to the mispicked weft yarn is inserted from a weft picking side to a counter-weft picking side of the loom. The inserted weft yarn is drawn together with the mispicked weft yarn to the counter-weft picking side, thereby effectively peeling off the mispicked weft yarn from the cloth fell.

Abstract: A loom having a drum type weft reservoir including a drum on which a predetermined length of a weft yarn is wound to be measured and reserved prior to weft picking. The weft reservoir is automatically prepared for loom starting by merely operating a manual switch. The local includes a clutch which is engaged at a predetermined operational phase of the loom to drive the weft reservoir. If the manual switch is actuated when the clutch is disengaged, then the clutch is engaged at a second time substantially later than the first time at which the predetermined operational phase is reached. Any cut, broken or unnecessary weft yarn remaining wound on the drum when the switch is actuated is removed during the interval between the first and second times, e.g. by pulling the weft yarn from the side of a weft inserting nozzle.

Abstract: In a control for a warp beam drive of a weaving machine, the warp beam drive is regulated at all times by a control which receives input signals representing the number of rotations of the warp beam and representing the tension of the warp threads. If the weaving machine has come to a standstill because of an error which has taken place, then, before the warp beam drive is re-started, the tension on the warp threads is increased to a specific value by rotating the warp beam in reverse, in order, during re-start, to take warp thread tension back to a predetermined normal value again through suitable action on the warp beam drive. The effect of this is that no stop marks or start marks are formed in the woven material as a result of the weaving machine having stood still.

Abstract: In a system for removing a faulty weft on a loom a mobile weft catcher unit engageable with a weft of an open shed is driven for successive removal of the next and faulty wefts by operation of a controller which generates phased instruction signals in response to detection of abnormal weft insertion.

Abstract: A method of controlling a weaving machine which includes a shedding device with yarn guiding eyelets, an electronic control device for the shedding device, a warp let-off device and a fabric take-off device, the electronic control device having a program memory providing a weaving program with weaving program steps and an auxiliary program, comprises stopping the weaving machine in a shed by means of a stop signal, switching by means of the auxiliary program to inverse weaving the shedding device and the weaving program step of the shed in which the weaving machine has stopped, returning by means of the auxiliary program the weaving machine to the next preceding shedding crossing point, stopping by means of the auxiliary program the weaving machine in this next preceding shedding crossing point so that the yarn-guiding eyelets are placed in a middle position, switching by means of the auxiliary program the weaving machine from inverse weaving to normal weaving according to the weaving program, and restarting

Abstract: A weaving machine having a filling breakage detector for generating an error signal upon breakage of a filling thread. This error signal then stops the weaving machine. A pick finding process is then initiated in which the weaving program is set back and then blocked. After removal of any filling thread in the open shed, the weaving machine is operated until the preceding shed is opened enabling the removal of the filling thread. If this is the ruptured filling thread, it is replaced by a new filling thread, the weaving program is unblocked and the weaving machine is operated in its normal sequence. If the filling thread is not ruptured once or if another ruptured filling thread is detected in a preceding shed, the pick finding process is repeated. The cloth takeoff and the warp letoff are also set back correspondingly with the weaving program.

Abstract: A driving arrangement for a circular loom has at least one electromagnetic coupling which is capable of being actuated by a stop impulse synchronous with the stop signal of the weft thread supervisor, is disposed between the driving motor of the circular loom and the transmission of the fabric drawing-off device. This permits at a stop signal from the weft thread supervisor the disengagement of the transmission of the fabric drawing-off device from the driving motor of the circular loom, whereupon the fabric drawing-off device, with the inertia of the main shaft, immediately stops, unaffected by after-running of other loom components connected to the motor.

Abstract: In the weaving machine warp threads (24) are guided from a warp let-off apparatus (2) via a shedding apparatus (6) to a fabric take-up apparatus (4). The weaving machine contains a main drive (8) at which are connected a weaving reed (14) and a filling thread inserting element (16). In addition, an auxiliary drive shaft (46) is connected at the main drive (8), which auxiliary drive shaft (46) drives the warp let-off apparatus (2), the fabric take-up apparatus (4) and the shedding apparatus (6). A common drive shaft (66) of the warp let-off apparatus (2) and of the fabric take-up apparatus (4) is connected with the auxiliary drive shaft (46) via a reversing gear unit (10). The reversing gear unit (10) is constructed as a superimposed gear unit and contains an auxiliary motor (90) in order to superimpose a reverse rotational movement of the warp let-off apparatus (2) and the fabric take-up apparatus (4).

Abstract: In a jet loom embodying the present invention, in general, measured lengths of the weft yarn are inserted by fluid actuation into the shed delimited between the upper and lower warp yarns. When stop signals for the loom are sensed, the weft yarn about to be inserted into the shed is deflected under suction from its normal course and thus inhibited from entering the warp shed until the time of complete stop of the operation of the loom, which is braked. After the termination of braking, the moving components of the loom are operated in reverse and brought in this manner to a predetermined angular position of one weaving cycle. With the loom resting in this position, the lastly inserted weft yarn is disposed of.Suction of the weft yarn is performed by a suction pipe having a suction opening disposed near the usual weft route.

Abstract: A voltage to be applied to the primary winding of a drive motor is automatically and time-functionally adjusted in relation to the rated voltage of the drive motor in order to provide sufficiently large torque for beating during the starting period of the loom running and transit to normal running of the loom is carried out at a preselected moment other than the moment of beating motion. Change in voltage is effected through either switching in mode of connection for the primary winding or transforming the power source voltage which is maintained constant.

Abstract: A takeup motion control device for a loom includes an input setting unit for producing functions of a repetitive period and a takeup speed, a function generator for storing the functions in relation to r.p.m. of the loom, an arithmetic control unit for successively reading out the selected functions from the function generator in synchronism with rotation of the loom to generate a digital takeup command signal, a driver circuit for generating a drive signal in response to the takeup command signal and applying the drive signal to a servomotor for driving a winding roll to wind a woven fabric, and a digital feedback circuit for feeding an amount of rotation of the servomotor back to the arithmetic control unit.

Abstract: A shot seeking mechanism for weaving looms characterized by consisting primarily of the combination of two clutches (1 and 2), each of which is respectively constituted primarily of clutch units (5 and 6 and 7 and 8) whereby one of these clutches is placed between a drive component (3) and a driven component (4) of the main shaft of the machine, while the second clutch (2) is placed between the driven component (4) of the main shaft of the machine and an auxiliary drive motor (13).

Abstract: A method of regulating the tension of warp yarns in a weaving machine is disclosed herein. In a preferred embodiment of the invention, variation in warp yarn tension is detected by a tension roller which is movable with a change in the tension. The speed at which a warp beam is rotated is controlled in dependence upon the manner of the tension roller movement in such a way that its unwinding rotation during normal weaving operation of the machine is speeded up with an increase in the warp yarn tension and slowed down with a decrease therein, and also that its rewinding rotation during reversing operation of the machine is decelerated with an increase in the warp yarn tension and accelerated with a decrease in the tension.

Abstract: A weaving machine is combined with a stop control means. A warp feeler, a weft feeler or a manual stop switch produces a stop signal and sends it to the control means. A comparator compares a crank angle sensed by a crank angle sensor with a preset angle supplied by a preset angle supplier, and produces a position signal at the preset angle. If the control means receives the stop signal during a normal weaving operation, then the control means stops the weaving machines immediately regardless of the crank angle by sending an output signal to a brake system of the weaving machine. After that, the control means starts the weaving machine moving at a slow speed, and stops this slow speed movement when the comparator produces the position signal at the preset angle.

Abstract: The invention relates to mechanisms for uncoupling two rotating elements. The device includes a positive clutch sliding on a rotating drive element and subjected to the action of a return spring, an energy storage spring stronger than the return spring and designed to disengage the positive clutch, a cam connected to the drive element and designed to tension the energy storage spring, a pawl capable of keeping the energy storage spring tensioned, and an electromagnet intended to actuate uncoupling and connected to the pawl so as to release the energy storage spring. The device is applicable to temporary uncoupling of two coaxial rotating elements in particular in weaving looms, in order to uncouple the crankshaft from the loom and its main motor from the dobby shaft and its auxiliary control motor.

Abstract: A method of stopping a loom, whose operation is controlled by a microcomputer, at a predetermined position thereof is disclosed herein. In view of the phenomenon that the load on loom operation is varied with the operating cycles thereof depending on the texture of fabric to be woven, but the variation takes place in repeated cycles of similar patterns each including different phases in succession of a known number, the method according to the invention comprises the steps of detecting the deviation of the actual stop position from the predetermined position resulting from the preceding loom braking operation, executing arithmetic operation on data regarding said deviation for compensation thereby to adjust the position at which brake is to be applied in the current braking operation, and applying brake when said position determined through said arithmetic operation is reached by the loom, wherein such steps are carried out in each group of the phases that correspond to each other in similarity.