Abstract: The invention relates to an antifriction bearing (30) of the roller (34) type for a pulling system for a weaving loom, comprising: an inner race (32) and an outer race (36) lying one on each side of the rollers (34) defining two raceways (321) and (361), two end plates (40, 42) secured to the inner race (32) and positioned respectively and axially close to each flank (34a, 34b) of the rollers (34), each end plate (40, 42) lying radially (Y) beyond the raceways (321, 361), the end plates (40, 42) and the inner race (32) being intended to be mounted between two lateral flanges (24a, 24b). At least one end plate (40, 42) has a shape defining at least one cavity (41, 43) adjoining all or part of a flank (34a, 34b) of the rollers (34) and able to accept a lubricant.

Abstract: An apparatus for tensioning warp threads in a weaving machine having a rotatably mounted carrier beam (5) which exerts strain on a tensioning roll (10) acting on the warp threads (15). A pre-stressed torsion spring (16) is arranged inside the carrier beam (5) and via its torque, presses the tensioning roll (10) against the warp threads (15). The apparatus can sense the torsional moments of the torsion spring (16).

Abstract: An apparatus for applying substantially uniform tension to warp threads along a warp thread path in a weaving machine. The apparatus has a carrier element (5), a tensioner element (7) for the warp threads which is multiply supported thereon, said tensioner element being pivotal about the axis of the carrier element, and a drive apparatus (8) which is connected drivewise to the carrier element. The drive apparatus (8) consists of a motor (9) and a kinematic chain which is connected to the carrier element (5) in such a manner that the introduction of the forces into the carrier element takes place substantially symmetrically with respect to its longitudinal extent.

Abstract: An apparatus for controlling a warp tensioner of a weaving machine. The apparatus contains a spring member that is in working connection with the warp tensioner and a control system that has a container communicating via a 2/2 way valve with the spring member in order to vary the spring stiffness of the spring member and the position of the warp tensioner from a terminal at the side where the weaver stands by increasing and decreasing the effective volume of the spring member.

Abstract: A tensioning unit for breakage-prone or rupture-sensitive warp threads in a weaving loom is constructed to avoid a torque responsive characteristic that gently tension the warp threads. For this purpose the tensioning unit is equipped with a torque moment compensation arrangement for compensating non-symmetric loading of a smoothing roller (10). A hollow guide roller (11) carried on rigidly mounted levers (9) has mounted inside the guide roller a rotatable stabilizing shaft (18), which in turn is operatively connected to the smoothing roller (10) through plates (19), so that the smoothing roller itself is supported by spring-loaded levers (8).

Abstract: The warp threads (30) in a weaving loom are guided by a warp guide roller (16) and tightened by a warp tension roller (21). Both rollers (16, 21) are rotatably supported on a plurality of carrier brackets (15) spaced from each other along the loom weaving width and secured to a crossbar (2) operatively mounted in the loom frame by mountings (4, 6, 7). Each carrier bracket (15) has at its free end a bearing (15A) in which the warp guide roller (16) rotatably rests. Each carrier bracket (15) further carries at least one warp tensioning lever (19) journalled to the respective bracket (15) and having a bearing (19A) for supporting the warp tensioning roller (21). A cam drive (28, 29) biased by a spring (12) operates the warp tensioning levers (19) and thus the warp tensioning roller (21) into a warp tensioning position.

Abstract: A warp tensioning mechanism for a weaving loom is so constructed that a crossbar (8) that carries the tensioning mechanism is mounted at each end in the loom frame for a three-dimensional adjustment (5, 5A, 5B) vertically up and down, horizontally back and forth, and angularly about the longitudinal axis of the crossbar. After adjustments have been made, the crossbar is locked in position. The crossbar carries two sets of bearing brackets. One set (16) of bearing brackets holds a carrier beam in first bearings. The carrier beam in turn holds a warp tensioning roller (23) in second bearings (18). The second set of carrier brackets (16A) holds a warp guide roller (25) in third bearings (27).

Abstract: In order to prevent the formation of weft streaks in cloth when a loom is restarted after a stoppage, the warp tension is reduced by a predetermined amount as soon as the stoppage occurs and the original warp tension is restored before restarting. The reduction in the warp tension prevents the tensile failure, that is, the plastic extension of the warp yarn, and ensures the exact repositioning of the beating-up line of the weft upon restarting.

Abstract: A tensioning device of a loom is embodied by a tensioning element rotatably mounted on a plurality of rollers which, in turn, are supported at spaced apart bearing places on a drive shaft. The drive shaft is biased by a torsion bar acted on its end by an adjusting mechanism driven by means of an eccentric. The tensioning device comprises a reduced number of parts of reduced dimension and can therefore adapt very rapidly to changes in the position of the warp yarns. The tensioning device is particularly suitable for high-speed looms which process delicate warp yarns.

Abstract: A device for moving a back rest in weaving machines includes two movable supporting mechanisms between which the back rest is mounted, an eccentric for moving the supporting mechanisms and whose eccentricity can be modified, and a driving wheel for driving the eccentric. A mechanism provided between the driving wheel and the eccentric permits a continuous setting of the phase of the eccentric in relation to the driving wheel. The mechanism includes a seating formed in the driving wheel, an element which fits in the seating and which can be axially turned in relation to the driving wheel to which the eccentric is coupled, and a clamp for clamping the element at any required angular position in the seating.

Abstract: To compensate for difference in path length between a warp thread guide element and a reference position, for example adjacent a take-up beam (3) beyond the shed (8), a plurality of guide elements (34) are located between a run-on guide rod (31) and the shed forming heddles (7), the guide elements being controlled to move in synchronism with the heddles in a direction essentially along a central plane (8a) of the shed to compensate for lateral deflection of the threads as the shuttle moves through the shed, and the shed is closed after the shuttle (9) has passed therethrough. The thread guide elements (37) preferably are U-shaped structures, retaining a plurality of transverse rods (39), and deflected by a cam shaft (42, 47) in synchronism with shuttle movement and movement of the heddles.

Abstract: The apparatus for controlling the warp thread tension by positional displacement of a back rest on a loom includes a swivelling lever mechanism with a rocking lever which carries the shaft of the back rest and which rocking lever is controlled by a cam plate or disc. The apparatus also includes additional members effecting an additional warp thread tensioning by an additional positional displacement of the back rest during the start-up operation of the loom. The swivelling lever mechanism further includes a connecting element which serves for altering the relative distance between the cam plate or disc and the rocking lever carrying the shaft of the back rest. The relative length of the connecting element is variable by a temporarily operative actuating device. These measures permit a very simple and functionally reliable concept of the additional members of the apparatus.

Abstract: A weft-bar (set mark) prevention system for a loom which can prevent a weft-bar caused when the loom is immediately restarted, after the loom has been stopped due to weft- or warp-thread cut (i.e., breakage of a weft or warp thread). When the loom is restarted from the closed-shed state, a greater additional warp tension is applied to the warp threads; when the loom is started from the open-shed state, a smaller additional warp tension is applied to the warp threads. After one or two cycles of the loom motion, the above-mentioned additional warp tensions are not applied, because the main motor is in a stable condition. The system according to the present invention comprises an optical loom-starting angle sensor for detecting whether the loom is started from the closed-shed or open-shed, a counter for determining at least one initial cycle during which warp tension is controlled, air cylinder to push the easing lever in the direction to increase warp tension.

Abstract: An apparatus for regulating tension in warps of a weaving machine comprising: a tension lever swingably supported on a weaving machine and having a roller supported thereon for regulating the tension in warps delivered from a warp beam; a weight lever swingably supported on the weaving machine and having a load at one end thereof; and a link operatively connecting the tension lever and the weight lever. The tension lever has an elongated hole formed thereon, and the lever ratio of the tension lever is changed by moving the link along the elongated hole.

Abstract: An easer bar for controlling the tension of the warp threads in a loom controlled by a positive action dobby for weaving leno type fabrics is directly controlled by and connected to the dobby.

Abstract: Mechanical device disposed behind the heddle frames of a loom for increasing the weft density in cloth weave fabrics, constituted by three parallel rollers situated horizontally at the vertices of a triangle, of which the rear roller separates the two equal sets of warp yarns while the other two front rollers are located very close together and act as an outlet guide for said two equal sets of warp yarns. The three rollers are rigid at their ends with two lateral support plates which are made to reciprocate, by means of connecting rods connected eccentrically to the loom drive shaft, about a horizontal rotational axis which lies in the center plane of the shed formed by said two sets of warp yarns, and passes in proximity to the two front thread guide rollers and at an equal distance therefrom. The three rollers are connected rigidly together by intermediate support plates.

Abstract: An apparatus for regulating tension in warps of a weaving machine comprising: a tension lever swingably supported on a weaving machine and having a roller supported thereon for regulating the tension in warps delivered from a warp beam; a weight lever swingably supported on the weaving machine and having a load at one end thereof; and a link operatively connecting the tension lever and the weight lever. The tension lever has an elongated hole formed thereon, and the lever ratio of the tension lever is changed by moving the link along the elongated hole.The apparatus further includes a support member having two pairs of guide rollers and being connected to the link, so that the relative movement between the link and the tension lever can smoothly be carried out.

Abstract: A weaving loom is equipped with a system for controlling oscillation of a warp yarn support roller in which a first rotary cam actuates an oscillating first lever connected to a first arm integral with a first shaft on which the roller is mounted. The first shaft rests, through the intermediary of raising members, in bearings supported by second levers pivoting about a fixed pivot and connected, through the intermediary of pivoted connecting rods, to the third and fourth levers which are keyed to a second shaft and subject to urging by at least one spring. The system includes a fifth lever keyed to the second shaft and a second rotary cam actuating an oscillating sixth lever pivotably connected to a second arm which is alongside the fifth lever and is freely mounted on the second shaft. A fixed first hook is mounted on the second arm and a pivotable second hook is mounted on the fifth lever. An electromagnet holds the second hook clear of the first hook except when the loom is being started.