Roj Electrotex S.p.a.

Nuova Roj Electrotex S.r.l.

Nuova Roj Electrotex S.r.1.

Bruno Maina

Roberto Bertolone

Fiorenzo Ghiardo

Yarn feeding device with self-adjusting braking mechanism

Yarn feeder with adjustable braking mechanism

Yarn feeder with adjustable braking device

Weft feeder for eliminating yarn tension peaks

Weft feeder with rethreading and braking devices

A measuring weft feeder for fluid jet looms which measures the weft yarn lengths being inserted into the loom shed is disclosed. The weft feeder comprises an electric motor for rotating a winding arm, a drum held stationary around which the arm winds up the yarn into even turns, forming a weft yarn reserve whose length is controlled by means of suitable sensors, and a yarn stopping device. The yarn stopping device includes a rod for engaging and stopping the yarn at the outlet of the feeder. The rod is movable between a withdrawn rest position and a projecting yarn stopping position in which its end moves into a cavity formed for such purpose on the drum periphery, close to the free end thereof. The drum cavity has mounted therein a plurality of bristles positioned transversely to the rod of the yarn stopping device, so that the rod may engage the bristles, crossing them at least partially, when assuming its projected position to stop the weft yarn.

Weft feeder with bristle containing stopping pin cavity

In a measuring weft feeder for fluid jet looms, of the type having a winding unit with adjustable cross section and comprising a cage wall formed of two sets of alternating columns mounted on reciprocally slanting flanges so as to move forward the yarn reserve into separate turns. The sets of columns (preferably divided into evenly spaced groups or sectors) are mounted on the respective flanges by way of structure adopted to adjust their radial position, this structure acting simultaneously and to an equal extent on both sets of columns and being operated by a single control member.

Weft feeder having yarn reserve winding unit with adjustable cross

A weft feeder for gripper or projectile looms comprising a body housing a motor, a drum idly mounted on the motor shaft and held stationary around which a winding arm rotated by the motor winds up a weft yarn reserve, a bracket positioned alongside the drum and carrying sensors to detect and control the yarn reserve as well as a brake to stop the yarn against the end surface of the drum, and three compressed air devices acting on the yarn to automatically restore the continuity of the weft yarn from the feed spool to the loom is disclosed. The first device is positioned at the inlet of the weft feeder to withdraw therefrom broken yarn and introduce therein new yarn fed by the spool. The second device is positioned adjacent to the weft feeder drum to receive the new yarn fed by the first device and by the winding arm to send it to a fixed point. The third device consists of at least a suction nozzle mounted, downstream of the brake, at the end of the weft feeder bracket positioned alongside the drum. The bracket is adapted to move the brake and the suction nozzle from their usual position centered on the weft feeder axis, to a position in which the inlet of the suction nozzle coincides with the fixed point.

Weft feeder with apparatus for broken thread removal

In a measuring weft feeder for fluid jet looms, the continuity of the weft yarn from the feed spool or reel to the main nozzle of the loom is automatically restored by two compressed air devices acting on the weft yarn, the first of which--positioned at the inlet of the weft feeder, to withdraw therefrom the broken yarn and introduce therein new yarn fed by the spool or reel--comprises a first duct connected to the inlet of the weft feeder, along which duct there are positioned a clamp, a nozzle and a cutter. A second duct branches off from the first, close to its outlet into the weft feeder, which also comprises a nozzle, while the second device--positioned adjacent to the weft feeder drum, to receive the new yarn fed by the first device and by the winding arm and send it to a fixed point for feeding the main nozzle of the loom--comprises a curved profiled duct, which is either open or adapted to open longitudinally towards the drum and has an aerodynamic guide for the yarn. A third compressed air device can also be provided, to act on the weft yarn is sent from the second device so as to facilitate its feeding into the main loom nozzle, this third device also comprising a duct wherein acts a nozzle as well as an air outlet.

Weft feeder for fluid jet looms with pneumatic rethreading apparatus

In a measuring weft feeder for fluid jet looms, comprising a weft yarn reserve winding unit with variable turn length of the weft yarn that length can be adjusted with a single operation. For this purpose, the winding unit comprises a drum of adjustable diameter, formed by associating a fixed eccentric cylinder with a plurality of movable rods, parallel to the axis of the cylinder and surrounding a wide portion of its periphery, the distance of the rods from the cylinder being variable and adjustable for each rod or for groups of rods. For each rod or group of rods, a control arm is provided slidable in a guide of the winding unit positioned perpendicularly to the axis of the unit, the arms being movable simultaneously in the respective guides under the control of a single operating member.

Weft yarn reserve winding unit with adjustable diameter winding drum

Device to apply paraffin oil or like onto the surface of textile threads, so as to make them smoother and facilitate weaving thereof. The device includes: at least one container or vessel for a paraffin oil, closed by a cover; at least one rove or felt strip having at least one vertical length with the lower end plunged into the oil of the container and one length, usually horizontal, positioned beneath the cover of the container; and a distributing head, positioned beneath the cover of the container and above the path of the thread, and consisting of a filtering membrane, on the surface of which rests the rove, and of a member pressing the rove onto said membrane, the path of the thread being such that it laps from underneath the outer surface of said membrane.

Device to apply paraffin oil to textile threads, particularly weft

A device for greatly damping the oscillations and vibrations of weft yarns fed from a weft feeder to a loom, at the outlet of the feeder, particularly when yarn cutting takes place in the loom, comprises, in association with the conventional fixed yarn guide at the outlet of the weft feeder, a second fixed yarn guide, parallel to the first and downstream thereof, as well as an intermediate yarn guide, movable between a position in which it does not engage the weft yarn on its path between the two guides, and a position in which it engages the yarn and deviates it, forcing it to follow a winding path between the two guides. The positions of the intermediate yarn guide are controlled by an actuator and selected by the electronic circuit of the weft feeder, according to the working of the loom, so as to deviate the yarn when yarn cutting takes place.

Device for damping weft yarn oscillations and vibrations in weft feeders

Yarn feeder for textile machines

A casing for weft storage and feeding devices for use in weaving looms comprises a central body housing the motor; and a peripheral arm guiding and supporting the brake unit, the sensor detecting the yarn reserve, and the yarn-guide eyelet. The casing is formed from at least one extruded section length.

Growing community of inventors

Valdengo, Italy

Bruno Maina