Abstract: A warp shedding apparatus of a loom includes a plurality healds arranged in a weaving width direction of the loom. Each heald has a thread eyelet through which a ground warp yarn is passed and held. The healds are raised and lowered to form a shed. A difference in tension between raised ground warp yarns and lowered ground warp yarns held by the healds located in opposite end portions in the weaving width direction is greater than a difference in tension between raised ground warp yarns and lowered ground warp yarns held by the healds located in a central portion in the weaving width direction.

Abstract: An electromagnetically-operating Jacquard control device has an electromagnet (1) with a magnetic core (3), an armature (8) and a limit stop (14) for each controlling element (16) to be controlled. The limit stop can optionally be brought into the movement path of a hook (18) attached to the controlling element (16). Two lovers (5, 11) are provided, the first bearing the armature (8) and the second bearing the limit stop (14). These two levers are coupled to one another with positive engagement such that the forces are transmitted substantially perpendicularly to the plane formed by the limit stop (14) and the swivel pin (12) of the second lever (11). This enables wear-related incorrect operation to be avoided.

Abstract: Attached to a dobby for use in a loom is an actuator which is, in turn, attached to a first finger and a second finger to move them in unison in a cycle. The first and second fingers control the position of an upper hook and a lower hook. These hooks, when engaged by a knife, will raise a frame. During the first half of a cycle, the actuator positions both fingers in either an upper or lower position. In the second half of the cycle, the actuator positions the fingers in either the upper or lower position.

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: A double-lift dobby of the Hattersley type, which includes swinging levers carried by moveable connecting rods wherein each connecting rod includes a slot in which an idle roller secured to the dobby frame is engaged. The edges of each slot define opposite tracks which guide the trajectory of each connecting rod during its full stroke.

Abstract: In a weaving mechanism which includes rocking members for controlling the movement of heddle frames for forming the shed in weaving machines, the rocking members are separated from one another on a common support shaft by spacers interposed therebetween which spacer members are provided with projecting bosses which come into contact with bosses of adjacent spacer members. A rod cooperates with an arm of the spacers to insure the spacers are non-pivotably retained while the rocking members are moveable between the bosses extending therefrom.

Abstract: A double lift openshed dobby has a central shaft (1) on which are mounted a plurality of swing levers (2), each carrying a pair of articulated hooks (3), (4) kept inoperative by a spring (5), and two drive knives (13), (14) which are reciprocated at half the loop frequency in opposite phases to shed said swing levers selectively between two rest positions of openshed. In use, each swing lever is connected to a loom harness and defines a first of said rest positions when rested on a cross bar (12) against a downward bias; the other rest position being defined when the elevator (10), located by a cross bar (11), engages the notch (2a) in the swing lever. If a swing lever has to stay in its current rest position its hook pair is left inoperative; but if it has to be shed a hook of its hook pair is made to link by the action of the selector (6) with whichever of the two drive knives approaches its rest position first and, simultaneously, the elevator (10) is made to release or engage the notch (2a) as necessary.

Abstract: A double lift dobby for controlling the movement of the heddle frames of a weaving machine which includes coupling members pivotally connected at each end of double swinging levers which coupling elements are selectively engaged to oscillating plates by reading and transmission elements controlled by extendable members of an actuating mechanism.

Abstract: The hooks associated with the swinging levers in a negative dobby of a weaving machine include a notch and opposing bearing face along their inner edges for positively retaining the hub and one arm of a bolt which is selectively actuated to engage each hook.

Abstract: In a negative dobby for forming the warp shed in weaving looms, impacts and friction are reduced and consequently vibrations and noise-thereby improving the stability of the heald frames-by suitably shaping the rear end (14) of the hooks ( 7, 8), so as to facilitate the oscillation thereof only when they engage with the crooks (9, 10) which cooperate with the hooks.

Abstract: In negative dobbies of the type incorporating swinging lever assemblies to which lever elements are connected and which lever elements support two articulated hooks, retaining members are provided in the form of pivotable locks placed between the bearing face of each hook and the pivot pins by way of which the hooks are mounted to the lever elements.

Abstract: In a negative dobby for forming the warp shed in weaving looms, the stresses on some of the machine components are greatly reduced, whereby a more precise control of the heald frames is obtained, thanks to the fact that the controls transmitted to the crooks (9, 10), engaging the hooks (7, 8), by the means (12) reading the pattern of the fabric to be woven, are no longer affected by the strains deriving from the stresses imparted on said crooks (9, 10). This is obtained by operating the crooks (9, 10) by means of two-armed levers (13), controlled by the spiked roller (12)--forming the pattern reading means--and connected by spring means (17) to a square arm (18) of said crooks (9, 10), the rocking movements of said crooks (9, 10) and of said two-armed levers (13) being controlled by two distinct shafts (9A, 14).

Abstract: In a reading device for a dobby machine, the reading levers and retaining hooks are pivotally mounted on separate axes. Each reading lever rotates a retaining hook so that the angular velocity of the retaining hook decreases as the retaining hook pivots from its disengaged to engaged position and increases when the retaining hook is disengaged. This acceleration and deceleration cushions the impact that the retaining hook experiences with changes in rotational direction.

Abstract: The present invention relates to dobbies incorporating double swinging levers for weaving looms. In order to simplify the construction of the reading device in the case of synchronized dobbies capable of operating both in reverse motion and in forward motion, there is associated with each selection hook a releasable retaining member which immobilizes it in one or the other of two stable positions of operation, so that the reading device need exert only a fleeting action (pulse) on one or the other of two heels of the hook, whereby no sustained action of the reading device is necessary.

Abstract: A positive dobby machine characterized in that return knives (16a), (16b) move in parallel and have pressure receiving planes (18a), (18b) perpendicular to the moving direction, first pressure receiving planes (7a), (7b) which can be contacted in surface contact state with the pressure receiving planes (18a), (18b) of return knives (16a), (16b) are formed on hooks (6a), (6b) pivotally attached respectively to upper and lower ends of a vertical lever (5), and the first pressure receiving planes (7a), (7b) of the hooks (6a), (6b) is pushed in surface contact state by the pressure receiving planes (18a), (18b) of the return knives (16a), (16b) thereby the vertical lever (5) is driven.

Abstract: A reciprocating double lift dobby operating an open shed has a pair of drive members 1, 2 which reciprocate at half the loom frequency and 180 degrees out of phase, one above and the other below a series of shafts 3 which are connected one to each of the loom harnesses and each of which is movable by either drive member between a pair of stationary positions, corresponding to the base positions of the open shed, when required to do so by the weave pattern. One of the stationary positions is defined by a fixed member 5 engaging a stop 15 on the shaft 3, and the other is defined by a catch 8 which engages a lug 18 on the shaft. In each loom cycle, each shaft 3 will either remain in one or other of the stationary positions or will be moved from one to the other depending on the positions adopted by linked selection levers 9, 10, 20 which are controlled by the weave pattern.

Abstract: Improved means are provided in a loom dobby for taking-up play in the control unit. The surfaces of the fixed and mobile blades which limit the stroke of the rocker arms in this unit are positioned perpendicular to the line joining the points of contact between the dobby hooks and knives to the mean points of contact between said blades and the rocker arms. Moreover, said surfaces are concave in the fixed blades and convex in the mobile blades. The linkage which cause the mobile knives to oscillate are in the form of false articulated parallelograms.

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 apparatus includes two retaining elements associated with the control elements, two actuating elements associated with the retaining elements, a shaft acting on the actuating elements in order to pivot the latter and to displace them in translatory motion, and an electromagnet which can be optionally energized and deenergized.The shaft is oscillatingly driven in accordance with the motion of the control element at the timing of the loom. The actuating element is brought into contact with, and out of contact from, the electromagnet independently of the control cycle and is displaced in the direction of the retaining element only when the electromagnet is not energized. The actuating element need therefore be displaced only once during the period of time defined by the clearance S, so that the operating speed of the loom can be increased.

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: In a negative double lift dobby machine, a balance lever 8 is pivotally attached to a jack-lever, and driving members 16, 17 disposed respectively in front of upper and lower ends of the balance lever 8 reciprocate in opposite phases with each other. Driven hook levers 10, 11 are pivotally attached to the upper and lower ends of the balance lever 8, and driving hook levers 18, 19 opposite to the driven hook levers 10, 11 are pivotally attached to the driving members 16, 17. Command levers rotate the driving hook levers 18, 19 to be engaged with the driven levers 10, 11 respectively. Flat surfaces 10b, 11b constituted in the driven hook levers 10, 11 respectively push stoppers 12, 13 under surface contact state.

Abstract: The present invention relates to dobbies of the type in which each double swinging lever is controlled by two pulling hooks cooperating with pulling knives with reciprocal movement. Each non-selected pulling hook in each pair is raised away from the associated pulling knife by a stirrup coupled to a vertical rod having a gripper at its upper end, the gripper being selectively coupled to a raising knife under the control of the reading mechanism. The raising knife is raised or lowered by a vertical slide mechanism which is coupled directly by a connecting rod to a lowering knife of the dobbie, so that the slide mechanism and raising knife move up and down synchronously therewith. The invention finds particular application in the textile industry.

Abstract: A draw hook having a bearing end, the outside circumference of which projects beyond the end of the baulk and serves simultaneously as stop against the recoil or repulsion knife and the stop rail. The drawing force for the movement of the heddle frame occurs from the draw hook directly through the bolt onto the baulk. The reaction and the holding force act directly onto the bearing end of the draw hook.

Abstract: A dobby for the formation of the shed on weaving looms, of the type in which each of the double swinging levers coupled to the heddle frames of the loom is displaced alternately by two pivoted pulling hooks which are controlled on the one hand downwardly by transverse lowering knives adapted to bring them in contact with pulling knives, on the other hand upwardly by stirrups under the control of the pattern mechanism and associated with lifting means which enable said hooks to displace the said pulling knives, wherein the lifting means are constituted by crosspieces directly fixed to the transverse lowering knives while the stirrups are shaped to cooperate with the said crosspieces when they receive the action of rocking levers placed under the control of the pattern mechanism.

Abstract: A dobby for a weaving loom, of the type in which each dobby element associated with a heddle frame or group of heddle frames comprises an actuating lever actuated by a reciprocating movement, a double swinging lever pivoted thereon and of which the ends are provided with fastening hooks, this double swinging lever being actuated by two cross-pieces carried by oscillating supports and common to all the elements of the dobby, and two retaining hooks adapted to selectively cooperate with the fastening hooks, each of these retaining hooks comprising on the one hand a first or main portion pivoted on the frame and which bears the hooking nose, on the other hand, a second selection portion pivoted on the first, connected thereto by a spring and stop system, and receiving the action of the weave mechanism, the whole being such that this mechanism may achieve the selection of the double swinging lever in question by displacing the second portion of one of the retaining hooks before the corresponding fastening hook ha

Abstract: A negative double-lift dobby, Hattersley system, comprising controlled holding hooks and draw hooks. In order for the holding hook to be able to be controlled at any time, namely independent from the position of the draw hook, by the pegs of the pattern card, at least one of the cooperating hooks is arranged shiftably against the force of a spring. The invention facilitates the control of fast running weaving machines and permits through the direct control of the heddles an increase in durability by reducing faulty controls and through the possibility of the precontrol an increase of the speed of the weaving machine.

Abstract: In a chain disc-type compound dobby machine, flexible instruction receiving members are integrally fixed to supporting hooks for decreasing the weight and the moment of inertia of the moving parts so that the connecting and detaching action of the hooks may be securely and easily performed. Moreover the number of parts is reduced and the structure becomes simple while at the same time effecting a stable high speed operation of the dobby machine.