Abstract: An electrical rotating apparatus for controlling a harness cord associated with the shed of a weaving loom which includes an actuator including a rotor and a stator. The rotor is formed of at least two permanent magnets which are mounted within a tube so as to be spaced axially with respect to one another and wherein a plurality of stator elements are also provided offset axially relative to an axis of rotation of the rotor such that each of the plurality of rotors corresponds with a separate one of the plurality of stators. The polarities of one or the other of the permanent magnets or the stator elements are offset angularly relative to the axis of rotation.

Abstract: A hook selection device for a weaving loom dobby head where the dobby includes a bottom board carrying hooks and an upper part for supporting the selection device. The upper part moves relative to the bottom board and includes rigid heald shafts provided with a catch corresponding to each hook on the bottom board. The position of each catch relative to a corresponding hook being controlled by an electromagnetic device having a coil. Each rigid heald shaft has a portion made of magnetic material and is mounted on the upper part so as to pivot about a pin. The selection device creates a permanent magnetic field in a region of the selection device having the heald shaft. The coil and permanent magnetic field drive the heald shaft to pivot either into a first position to permit entrainment of a catch and corresponding hook and a second position which does not permit entrainment.

Abstract: A dobby for controlling movements of a heald frame in a weaving machine is provided. A treadle is mounted on a treadle spindle and a link arrangement connects the treadle to the heald frame. Levers are mounted on the treadle and catching members are arranged on the levers and on the treadle. The catching members on the treadle interact with a corresponding catching member on one of the levers based on a control signal. Driving equipment moves the levers between a central position and an outer position. The treadle follows the movements of the lever it is connected to by the catching members and moves the heald frame via the link arrangement.

Abstract: A rotary dobby which includes pivoting arms which are moveable with respect to a plate connected to an element for actuating a heddle frame in controlled response to a reading-in device and wherein the pivot arms include catches which are uniquely configured having internal and external bearing surfaces which cooperatively engage binding surfaces of the plate.

Abstract: A rotary dobby which includes pivoting arms which are moveable with respect to a plate connected to an element for actuating a heddle frame in controlled response to a reading-in device and wherein the pivoting arms include catches which are engageable with respect to first and second spaced binding surfaces of the plate in such a manner that one of the arms is spaced from an actuator associated with the reading-in device when the pivoting arms are engaging the binding surfaces.

Abstract: An actuating selection device for a dobby mechanism for controlling movement of components used to affect movement of a heddle frame and a weaving loom wherein the selection device includes selector members which are pivotally mounted adjacent pole faces of an electromagnet and wherein a moveable armature is pivotally connected to the selector member and includes an outer extremity which is continuously urged into contact with a first of the poles of the electromagnet by a resilient element. The selector member is spaced from the electromagnet when no power is applied thereto and the selector member is moved toward the other pole of the electromagnet together with the moveable armature when power is supplied to the poles of the electromagnet with the movement of the selective member thus controlling the movement of the pair of components which affect the movement of the heddle frame.

Abstract: An electromagnet-striker bar system for the control device of a rotary dobby includes an amagnetic container having an extremely rigid box structure into which the iron cores of the electromagnets are equidistantly inserted and irreversibly locked. Amagnetic spools for supporting the electrical windings are mounted on electromagnetic pole pieces. The container is provided, in that side further from the hinging axis of said striker bars, with a longitudinal groove into which are inserted the amagnetic support and slide shoulders for the free ends of the striker bars. The free ends of the striker bars are hardened by heat treatment.

Abstract: A dobby comprises first and second hooks relatively moved in the direction of approaching and leaving each other, a lever for selectively forcing the second hook to be engaged with the first hook, and a pusher for selectively providing the force to the lever. One of the lever and the pusher has a cam-shaped contact face brought into contact with the other of the lever and the pusher.

Abstract: An adjustable connection link is provided between the dobby and the first crank lever of the control rods of each loom heddle frame. The connection link consists of two tubular bars of hollow aluminum alloy section pieces, preferably of rectangular cross-section. There is at least one internal rib that is perpendicular to the major sides of the rectangle. The section pieces, moreover, are cut away along opposing sides at their adjacent ends in order to expose the corresponding parts of their internal ribs. These are kept pressed, one against the other, in an adjustable position by a bolt. The bolt is threaded into one end of the section piece and passes through a slotted hole in the corresponding end of the other section piece.

Abstract: In a heavy closed-shed dobby of a weaving machine having oscillating levers which are selectively connected to one of two oppositely movable actuation knives by rocking double hooks mounted thereto so as to control the movement of heddle frames to which the levers are connected, a pair of locking members pivotally mounted to each lever. An elastic element is provided to urge one end of each locking member toward abutting engagement with a double hook thereby preventing pivotable movement of the double hook when engaged by one of the knives. The locking members are released from engagement with the double hook upon simultaneous engagement of the knives with a lever.

Abstract: A mechanism for controlling the reciprocating movement of knives associated with rocking hooks connected to the heddle frames of a weaving machine which mechanism includes a pair of rotatable drums oriented parallel to the path of movement of the knives. Each drum includes two profiled grooves in the surface thereof in which tracking members associated with the knives are cooperatively guided.

Abstract: An automatic control system for an electronic rotary dobby, has a pair of permanent magnets mounted on each of the corresponding rocker members. These members are driven by the dobby operating crank arms, such as the ends of the main levers. The magnets on the pair mounted on the rocker members are arranged such that in one end-of-rock position of the respective rocker member only one magnet cooperates with a related fixed sensor, and in the other end-of-rock position of the respective rocker member only one magnet cooperates with another related fixed sensor, and in the other end-of-rock position only the other magnet of the pair cooperates with its own fixed sensor. The sensor signals are compared with the corresponding signals of the predetermined weaving program, the loom being halted if they do not coincide.

Abstract: A high-speed rotary dobby key mover mechanism having a main crank arm in which two keying levers that have the same arm ratio are mounted for pivotal movement on a cam in opposing positions. The adjacent ends of the keying levers cooperate with a key, while the free other ends of the key levers, which are diametrically opposite about and at the same distance from the axis of the dobby drive shaft for the dobby cooperate alternately with a single control device which is located on only one side of the main crank arm. The control device is regulated, moreover, by a logic unit.

Abstract: A process for assembling the actuation elements of a rotating dobby, in which the connection between the driver plates of the different actuation elements and the driven shaft thereof is effected by axial tightening of the driver plates between an end cap and spaced bearings. Such tightening is effected once the drawing levers have been engaged on the pivot pin so that the members of each actuation element, which are selectively connected to one another by the coupling elements, are automatically properly positioned on the drive shaft.

Abstract: A positive eccentric dobby having a rigidly mounted roller lever shaft with minimal clearance, on which pivoted roller levers are disposed, which transmit the movement to the heald frames via coupled connecting rods, reversing levers and rods. A camshaft with eccentrically disposed cam discs is rigidly mounted on a displaceable carriage. In the state where there is a clearance between the rollers and the cam discs, one or more stops swivel the roller levers so that the heald shafts can be coordinated in several preset positions. When there is no clearance between rollers and cam discs, a jamming block having a motorized driving device fixes the position of the carriage with a stop.

Abstract: A warp insertion monitoring method and apparatus for positively protecting woven cloth from defects due to warp insertion error or failure. A warp detector is disposed on a loom so as to have a warp presence/absence detection region located at a front or rear side and in the vicinity of a reed which serves for beating a weft inserted through a shedding formed by the upward/downward motion of healed frames against a cloth fell. The presence or absence of abnormalities in respect to the positions at which warps are inserted through the reed is identified on the basis of detection information available from the output of the warp detector. Detection timing for the warp detection information is so established as to fall within a period during which the loom is stopped, so that the presence or absence of errors in respect to the warp insertion can be detected before the loom is restarted.

Abstract: An assembly of actuating elements of a rotating dobby for a weaving loom wherein the elements for controlling the movement of each heddle frame include a lever pivotably connected to a connecting rod selectively engageable with an eccentric which is mounted to a drive shaft by bearings. The eccentric and the connecting rods are selectively rotated with the drive shaft by being selectively engaged with drive plates which are secured to the drive shaft under axial compression between compression members and the bearings.

Abstract: An electro-magnetic unit for controlling the needles associated with the dobbies and other weaving mechanisms of a loom which includes a series of cassettes each containing electro-magnets for attracting blades associated with springs and stops to thereby define two stable positions for controlling the reciprocal movement of the needles and wherein the needles reciprocate through calibrated holes in a lower boss centered in an opening in the bottom of a box in which the cassettes are mounted.

Abstract: A loom harness having nested pairs of cylinders. The pairs of cylinders are arranged in parallel fashion and offset in relation to one another on a rigid, stationary frame. Pillow blocks spaced along the frame support the cylinders. Flexible cables, connect the pairs of nested cylinders and support heddle eyes at their approximate midpoints. Alternatively, the cables can support heddle frames which, in turn, carry wire heddles. Control cables are attached to the upper and lower cylinders, and are moved upwardly or downwardly by a dobby. An alternative control includes an A-C servo motor and drive shafts to move the cylinders. The selective rotation of the various pairs of nested cylinders causes the translation of the heddle eyes. This movement of the heddle eyes causes a shed to be created in the warp yarn passing through the eyes.

Abstract: An apparatus for controlling warp threads on weaving machines, particularly suited for control of warp threads on Jacquard type machines, for example selvedge machines. Control members are arranged to control movement of a warp thread and are adapted to be moved in arcuate paths by a reciprocatable member which reciprocates repeatedly. Selectively operable members cooperate with the control members to allow the control members to reciprocate fully with the reciprocatable members or to be held in a position in which the control members either reciprocate less than the reciprocatable members or do not reciprocate at all. The control members have abutting surfaces in different planes which slide relative to each other and which permit the control members to be positioned with the abutting surfaces facing each other with a combined thickness substantially the same as the overall thickness of one of the control members.

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 device for driving harnesses of weaving machines includes at least two driven cam shafts and at least one pair of conjugated cams connected to each other for each shaft. Swivel mounted levers which swivel about a common shaft are mounted alternately and in an opposite sense in relation to adjacent levers, each lever including two cam followers which operate with one of the conjugated cam pairs to provide a positive cam drive for the lever so that the lever oscillates. A transmission converts the oscillating motion of the levers into an up and down of the harnesses.

Abstract: A dobby apparatus is provided for use with hand looms for automatically controlling the lifting sequence of a plurality of shaft assemblies in accordance with a predetermined weaving program. The dobby apparatus has a dobby operating drive mechanism connected to a dobby operating arm for pivoting the dobby operating arm downwardly from a neutral position and returning it to the neutral position during each dobby operating cycle. A plurality of dobby hook pairs are mounted in a transfer position when the dobby operating arm is in the neutral position. Each of the plurality of dobby hook pairs are connected to a different one of the plurality of shafts. A plurality of dobby hook positioner assemblies contact the dobby hook pairs to laterally transfer both of the dobby hooks in each of the pairs between capture positions in the dobby operating arm.

Abstract: A modulator for controlling high-speed rotary dobbies of the type which control the dobby main shaft's motion by transmitting power from a drive shaft through pivotable rocker supports rotatably driven by the drive shaft and engaging conjugate cams so that the drive shaft's uniform rotary motion is converted into non-uniform motion of the dobby main shaft. This is caused by the conjugate cams, which cause the rocker supports to pivot. The rocker supports are mounted so as to accommodate this rocking. The two rocker supports are connected to the dobby main shaft by two connecting rods hinged by pins on one of the rocker supports and on an appendix of the main shaft respectively, these connecting rods being disposed antisymmetrically to each other in accordance with a particular geometry.

Abstract: A rotary dobby for moving a shaft includes a connecting rod connected to the shaft to be moved, the connecting rod having two mutually-opposite wedge detents disposed thereon, an eccentric disk carried on the connecting rod having a wedge guide extended radially in the eccentric disk, a drive shaft assembly having at least one detent groove formed therein, a coupling wedge disposed between the drive shaft assembly and the eccentric disk, the coupling wedge having an open shifting groove formed therein, two control pieces engageable in the shifting groove, two control rods each being connected to a respective one of the control pieces and being controlled according to a given pattern for pushing one of the control pieces into the shifting groove and for pushing the coupling wedge alternately into the detent groove along the length of the wedge guide when the drive shaft assembly is not rotating and into one of the two wedge detents, and a detent device disposed on the connecting rod at and associated with the

Abstract: A rotary dobby for moving a shaft includes a connecting rod connected to the shaft to be moved, the connecting rod having two mutually-opposite wedge detents disposed thereon along a given wedge-detent diametral line, an eccentric disk carried on the connecting rod having a wedge guide extended radially in the eccentric disk, a drive shaft assembly having at least one detent groove formed therein, a coupling wedge disposed between the drive shaft assembly and the eccentric disk, the coupling wedge having an open shifting groove formed therein, two control pieces engageable in the shifting groove, two control rods each being connected to a respective one of the control pieces and being controlled according to a given pattern for pushing one of the control pieces into the shifting groove and for pushing the coupling wedge alternately into the detent groove along the length of the wedge guide when the drive shaft assembly is not rotating and into one of the two wedge detents, and an automatic zero setting device

Abstract: A rotary switch is provided in a dobby with a rotation drive and has for controlling the coupling part an annular collar. During rotation of the drive shaft, the coupling part is guided actively by the rotary switch, the position of which during this time is releasably secured by a lock. For this purpose, a differential lever is arranged on the dobby, the position of which varies based on feedback through a rocking lever and a rail which indicates the position of the heddle frame. The reading of a point on the pattern card results automatically in the correct engaging or disengaging movement of the coupling part, independent of its position.

Abstract: A normal position of a shifting wedge of a lifting unit for a rotational dobby is achieved by a movable arrangement of the recess in a locking block which receives the wedge and has rigid side flanks. The entire locking block is, against the urging of a spring, supported for movement translatorically and/or swingably within certain limits, wherein the center axis of the recess moves only insignificantly out of its normal radial orientation.

Abstract: A dobby includes a needle mechanism having a reading needle, the head of which, during reading of a nonperforated location on a pattern card, engages a pawl and, during reading of a hole in the card, releases the pawl to permit the pawl, under the force of a spring, to tilt about an axle and in this manner to have a surface thereof disposed in front of an edge of a key-shifting gate. During the operating movement of the axle, the pawl pushes the key-shifting gate, which slides in rectilinear guides, wherein a key is carried along by a cam which encircles the opening for the shaft 1. The key is radially movably supported on the eccentric ring and engages one of two openings on the connecting rod, which results in a standstill of the heddle frame, or engages one of two grooves in the drive shaft. In the latter case, the drive shaft carries the key and the eccentric ring along as it rotates and moves the connecting rod, which triggers a movement of the heddle frame.

Abstract: For the purpose of producing a synchronized rotating dobby capable of operating equally well in both directions of rotation, a plate fixed to a heddle-frame displacing eccentric is provided with a second notch diametrically opposite the immobilizing first notch in which engages the nose element of a pivoting lever actuated by the reading device. This second notch cooperates with the oppositely located lever to ensure maintenance of the correct positioning of the plate.

Abstract: A locking lever is articulated to a latch. The locking lever is pivoted or swung out against the action of a spring and the pivoting or swinging movement is limited by a stop mounted at an eccentric. The opposite pivoting or swinging movement of the locking lever is limited by a surface at the locking lever which runs-up against a surface at the latch. Upon rotation of a drive shaft carrying the eccentric the latch can now assume a decoupling or decoupled position. Due to the provision of control levers with hook-shaped ends which, when pivoted into a predetermined position, cause the locking lever to run-up or travel against one of the hook-shaped ends, the latch is only then caused to be decoupled when subsequently and in accordance with the weaving program a decoupling operation of the latch is really intended to take place. Otherwise the latch is not decoupled because in that case the locking lever cannot run-up against one of the hook-shaped ends of the control levers.

Abstract: The invention relates to a levelling device for weaving mechanisms incorporating cams of the negative type. With each oscillating lever there is associated a tipping pawl adapted, under the effect of a control member common to all the pawls, to bear yieldably against the edge of the lever in question and to cooperate with a retaining stop formed thereon. Under these conditions, it is the weaving mechanism itself which furnishes the effort of levelling the heddle frames.

Abstract: The clutch arrangement contains a stroke member which carries two levers and a spring connecting the levers. The stroke member is driven by a drive lever which engages between the two levers. The stroke member drives the bar for the control levers while a scanning arm is moved against the armature of an electromagnet. Both movements occur with a force transmission occuring via the single spring. This provides for especially gentle treatment of the parts. At the same time, relatively few parts are needed.

Abstract: The invention relates to the textile industry and more particularly to looms. The device comprises a motor-reducing gear unit which can drive the dobby mechanism selectively, through a clutch, this mechanism being normally driven, from the main shaft of the loom by a pulley. A keying system enables the pulley to be made fast to or released from the shaft. The unit can, either drive the dobby mechanism alone for shedding motion searching, or drive the loom and the dobby mechanism for the slow speed operation of the loom. The invention overcomes the drawbacks of pulsed slow speed operation.

Abstract: A weaving machine is operationally connected to a shed-forming machine which includes a drive shaft and a braking mechanism. The latter includes a braking disk which is axially slidably supported on the drive shaft of the shed-forming machine. The braking disk can, during movement thereof, come into frictional engagement with a stationary counterpart. In an alternative embodiment, a modified pick-finding device is used as a brake. In the case of a halt of the weaving machine which is to be carried out quickly, for example during a thread break, the braking mechanism of the shed-forming machine is actuated to relieve the braking mechanism of the weaving machine, and thus no great braking action need be transmitted through the drive for the shed-forming machine.

Abstract: The invention relates to improvements in mechanisms for driving regulators of weaving looms. Between the shaft of the dobby and the chain pinion which drives the regulator of the loom there is interposed a differential reverser whose satellites are borne by a race axially moveable coil. The latter is moveable through the unweaving circuit so that the reverser is automatically actuated during unweaving and causes the regulator and the woven fabric to move backwards while the dobby continues to rotate in the same direction (electronic program).

Abstract: The present invention relates to improvements in shed locating devices associated with dobbies and other weaving systems. A device is provided to enable the dobby shaft to remain coupled to the loom shaft whilst being connected to an auxiliary motor and gear reducer for providing low-speed drive of the loom and the dobby for use when working on the weaving system. The same motor and gear reducer are also used during shed locating operations. The mechanisms for shifting between the normal operation of the loom and dobby, the shed locating operation, and the low speed drive of the loom and dobby are electrically controlled.

Abstract: An improved dobby uses linkages for controlling the oscillations of the fixed and mobile knives about their axes which comprise first levers fixed to the knives, second levers fixed to control shafts, and connecting rods which link said first and second levers together to form an articulated parallelogram.In this dobby, the hook operating rods are controlled by the same shafts which control the knife oscillations, by means of an articulated joint.

Abstract: The present invention relates to electromagnetic devices for controlling dobbies and other weaving systems, wherein the control unit which contains the electro-magnets is borne by an oscillating frame on which is mounted an equal number of selectors associated with a spring which tends to move them away from the associated poles of magnetic attraction. Each selector acts selectively on the actuating hooks of the dobby, and a fixed stop ensuring its return into applied position against the magnet upon return into a non-actuating position. The device is applicable to the control of a dobby with double swinging levers or to the control of a rotating dobby.

Abstract: Two rotation heddle frame units pivotally engage the respective ends of a differential lever, which units move the center of the differential lever in a patternlike manner between three different positions. The movement of the center of the differential lever is transmitted, through a rocking lever, onto a plate which, in spite of the three different lever positions, moves an angle lever and thus the heddle frame into only two positions, namely, the upper and lower shed positions. The heddle frame moves without any intermediate stop between its two end positions. Since each lifting unit stands still during the operating movement of the other unit, this standstill time, together with the duration of a possible shed standstill of the weaving machine, is available for actuating the lifting unit, and a higher weaving speed is thus possible.

Abstract: The present invention relates to improvements in rotating dobbies. The control of the coupling pawl for connection to the driving shaft is effected by one of two right-angled pivoting levers actuated in the same zone by push elements of the reading device of the dobby. When a lever engages in a notch in a plate fixed to the eccentric, the nose of the engaged one of the pivoting levers pushes a catch on the pawl which pivots the pawl causing the withdrawal of its finger to release connection with drive from the shaft.

Abstract: The clutch arrangement includes a proximity switch which monitors the coupled or uncoupled position of the pawl with the shaft through a transmission linkage as well as the movement of the heddle. Corresponding control signals are emitted to an electronic control device for comparison of the weaving machine with the weave program. In case of faults, the weaving machine can be immediately stopped. The transmission linkage includes levers which are actuated by the control levers for coupling and uncoupling the pawl with and from the shaft. In addition, the strap about the eccentric includes an abutment surface for actuating the transmission linkage to cause the proximity switch to be switched to an on position.

Abstract: For use on a loom having a pattern selector, a plurality of heddle raising units, each comprising a pulley supported on a shaft and having a funicular cording member wound on the pulley and supporting a heddle, the shaft supporting two annular driving members on which the pulley is journaled, and the unit having means for rotating one annular member in one direction and the other annular member in the opposite direction synchronously with the cycle of the loom, and the pattern selector controlling a device for selectively coupling the pulley to the one of the annular members whose rotation is in the correct direction to wind the funicular member on the pulley to raise the attached heddle.

Abstract: The clutch contains a spring for pulling the arm of the control lever on the stop and an additional auxiliary spring connected with a roller. While the control lever strikes on the stop, the roller moves toward one lever arm so that in a further rotation of the parts, the roller (30) is lifted within a slot while additionally tensioning the auxiliary spring. While the tension of the main spring decreases, that of the auxiliary spring increases correspondingly, so that the control lever is held with sufficient tension on the stop and machine vibrations during the striking or operation can be made harmless or damped.

Abstract: An apparatus for operating a loom heddle comprises a drive shaft centered on, rotatable about, and defining an axis, and an eccentric carried on the drive shaft, rotatable relative thereto about the axis, and formed with an axially extending guide. A crank connects the eccentric to the heddle for displacement of the heddle between end heddle positions as the eccentric rotates about the axis. A drive disk rotationally fixed on the drive shaft adjacent the eccentric is formed with at least one recess axially alignable with the guide. An entrainment bolt is axially displaceable in the guide between an extended entrainment position projecting axially in one direction therefrom into the recess of the drive disk and thereby rotationally coupling the drive disk and eccentric together and a retracted position disengaged from the recess for relative rotation of the drive disk and eccentric. A switch element is provided that is operatively engageable with the bolt to displace it axially between the positions.

Abstract: To move pile heddle frames between three or rather four shed positions, a four-position rocking lever is arranged between two adjacent heddle frame lifting units and the rocking lever controlling the heddle frame. The free end of the first lifting unit rocking lever is a hinge point for the four-position rocking lever and the free end of the second lifting unit rocking lever is a hinge point for a connecting bar extending to the four-position rocking lever. To reduce wild movements of the heddle frame, no loaded shafts are provided in the power-transmitting path from the lifting unit to the heddle frame, aside from shafts supporting the lifting units and the rocker arm of the heddle frame.

Abstract: The link disposed about the eccentric carries two stop elements in the form of rollers. When the pawl is engaged with the driving shaft, the stop rollers move in respective oval paths so as to engage and swing out the control levers to insure that the control levers do not accidentally swing inwardly into the path of the moving pawl or latch locking the pawl in coupled relation with the shaft. The stop rollers also permit an overstroke of the bar to occur in which there is a clearance between the bar and the reversing position of the stroke meter. In this way, the stroke of the stroke meter can be made smaller.

Abstract: The present invention relates to the system of angular connection of the eccentric of each element of a dobby either with the shaft or with the corresponding arm. This connection is ensured by a double hook borne by the eccentric and mounted to rock so that one or the other of its noses engages in a notch made in the periphery of a driving device fixed to the shaft, or in a notch in a bead of the arm.

Abstract: A rotational dobby for use with weaving machines having plural heddle frames. The dobby has an eccentric disk for each heddle frame arranged side-by-side on a drive shaft with a coupling wedge movably installed therein, which coupling wedge effects a coupling and uncoupling of the eccentric disk relative to two recesses which are diametrically arranged on the shaft. A connecting rod is provided on the outer circumference of the eccentric disk and is coupled directly or through a rocking lever to an operating rod connected in turn to the heddle frame. A control mechanism is provided with pressure fingers which are movable in response to an information pattern on a pattern card.

Abstract: This invention relates to a rotation dobby having a key coupling between a drive shaft and an eccentric device for the movement of the heddles, the key being mounted under spring action in a radially extending recess in an eccentric disk arranged in a crank arm and being engageable and disengageable in accordance with a pattern into and out of an axially extending groove of the drive shaft at two diametrically opposite coupling places by means of a shift rod which can be controlled in accordance with a pattern and engages via a coupling member into a groove of the key which is open in the axial direction of the drive shaft.