Patents by Inventor Bruno Maina

Bruno Maina has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5678779
    Abstract: Yarn feeding device for projectile or gripper looms, having a drum (D) to store the yarn (Y), an inclined annular deflection surface (G) at the free front end of the drum (D), a circumferentially continuous and yielding conical braking surface (B) at the wider end of a hollow conical brake carrier (C), pressed in contact with the deflection surface (G). The brake carrier (C) is supported at its smaller end onto a stationary part (P) and the braking surface (B) is adjustable with respect to the deflection surface (G), according to the yarn unwinding speed, so as to compensate for any tension increase in the yarn (Y), and an annular counterdeflection surface (H) for the yarn (Y), downstream of the deflection surface (G) and coaxial to the drum (D). The inside diameter of the counterdeflection surface (H) is smaller than the outside diameter of the deflection surface (G).
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: October 21, 1997
    Assignee: Nuova Roj Electrotex S.r.l.
    Inventor: Bruno Maina
  • Patent number: 5673729
    Abstract: Yarn feeder, especially to feed the weft yarn to gripper or projectile looms, wherein the weft yarn is unwound from a weft yarn reserve wound on a drum, onto the outlet end of which there acts a yarn braking device upstream of an outlet yarn guide. The yarn braking device, centered on the drum axis and adjustable along the drum, comprises a frustoconical braking element having a continuous surface and varying flexibility, especially along its generating lines. The yarn braking device is carried by a stiff ring support to which it is fixed close to its major circumference. The support is in turn fixedly mounted onto a bracket of the yarn feeder, the position of which is adjustable along the drum axis.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: October 7, 1997
    Assignee: Nuova Roj Electrotex S.r.l.
    Inventors: Bruno Maina, Roberto Bertolone
  • Patent number: 5647404
    Abstract: Device to feed yarn to machines making use thereof, particularly the weft yarn (T) to gripper or projectile looms, of the type in which the yarn to be feed is unwound from a reserve (R) wound on a drum onto the outlet end of which, where a first yarn deviation takes place, there acts a brake device (FR) which is centered on the drum axis and adjustable along the same, upstream of an outlet yarn guide where a second yarn deviation takes place. The brake device (FR) comprises a frustoconical braking element with continuous surface and differentiated elasticity, carried by a stiff ring support to which it is fixed close to its major circumference, and the stiff ring support is mounted so as to oscillate about two axes (S1, S2) which are perpendicular one in respect of the other and both in respect of the axis of the drum.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: July 15, 1997
    Assignee: Nuova Roj Electrotex S.r.1.
    Inventors: Bruno Maina, Roberto Bertolone
  • Patent number: 5577536
    Abstract: From a weft feeder (AT), weft yarn (T) is unwound from a reserve (R) on a drum (3) located at an outlet end of the weft feeder (AT). A yarn-braking device (1) includes a frustoconical braking element (6) with varying flexibility and a cup support (8) with an open base. The braking element (6) has narrow tongues (7) placed side-by-side. In the braking element (6), the tongues (7) join together, at a major circumference, into a band (6A) with a smoothly and strictly continuous surface engaging an outlet end of the drum (3), while they are free and freely bear, at a minor circumference, against an inner periphery of the cup support (8). The braking element (6) is connected to the cup support (8) such that the former can be deformed and/or perform limited movements in every direction. An outlet yarn guide (4) is separate from the braking element (6) and is kept motionless, coaxial to the drum (3), while braking takes place.
    Type: Grant
    Filed: June 29, 1995
    Date of Patent: November 26, 1996
    Assignee: Nuova Roj Electrotex S.r.l.
    Inventor: Bruno Maina
  • Patent number: 5487415
    Abstract: A weft feeder for gripper or projectile looms allows an operator promptly to restore the continuity of a weft yarn from a yarn feed spool to members for weft insertion into a loom shed, in case of weft yarn breakage or interruption. Downstream of a first yarn guide outlet, there are mounted a double-leaf brake, a separating element, and a second downstream yarn guide eyelet. The separating element is controlled by an actuator so as to separate two brake leaves of the double-leaf brake and to form a duct to guide the weft yarn from the first eyelet to the second eyelet.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: January 30, 1996
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 5271435
    Abstract: 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.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: December 21, 1993
    Assignee: ROJ Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 5201347
    Abstract: 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.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: April 13, 1993
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 5123455
    Abstract: 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.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: June 23, 1992
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 5109891
    Abstract: 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.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: May 5, 1992
    Assignee: ROJ Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 5046537
    Abstract: 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.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: September 10, 1991
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 4972796
    Abstract: 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.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: November 27, 1990
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 4949763
    Abstract: 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.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: August 21, 1990
    Assignee: ROJ Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 4901771
    Abstract: 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.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: February 20, 1990
    Assignee: ROJ Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 4719947
    Abstract: A rotor for weaving loom weft feeding devices, comprises a framework formed by a hub, a plurality of spokes extending outwardly from the hub at an oblique angle, and an outer circular rim. One of the spokes is larger than the others and contains the weft yarn passageway extending lengthwise thereof. Two thin covers enclose the framework and are fixed securely to it, which eliminates the build up of dust between the spokes. The rim defines annular recesses within which the motor casing on one side and the winding drum on the other side nest.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: January 19, 1988
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 4638840
    Abstract: Weft feeder for weaving looms, of the type wherein the drum (1) around which the weft yarn winds to form the reserve is held stationary, while the turns (3) of the reserve are laid thereon by a rotating reel (2) and are moved forward, mutually spaced, by a set of columns (5) prevented from rotating in respect of said drum (1), but partially and variably emerging from special seats of its periphery. The ensemble of columns has a frustoconical profile, each column (5) being tapered towards the feeder outlet end, until it no longer emerges from the seats where there is maximum tapering. A photoelectric cell unit (8), moving parallel to the axis of the drum (1), detects the presence and the consistency of the weft yarn reserve wound thereon, in order to control the rotation and regulate the speed of the motor of the feeder.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: January 27, 1987
    Assignee: ROJ Electrotex S.p.A.
    Inventors: Fiorenzo Ghiardo, Bruno Maina
  • Patent number: 4632154
    Abstract: In a weft feeder for weaving looms, a rotating arm winds a reserve of weft yarn turns around a drum held stationary and structure is provided to move forward the turns on the drum, keeping them mutually spaced. The structure comprises a set of columns, prevented from rotating in respect of said drum, but partially and variably emerging from seats in its periphery, thanks to the motion imparted thereto by the feeder motor shaft, in respect of which they are rotatably mounted by way of a skew bushing and a rotary bearing. This bushing is formed of two hollow bodies, the first of which is keyed to the motor shaft, eccentric in respect of the drum axis, while the second is rotatably mounted on the first, but adopted to be locked thereto in two positions at 180.degree. one in respect of the other and having its outer surface inclined in respect of that axis.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: December 30, 1986
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: 4632155
    Abstract: In an improved electromagnet structure for stopping the unwinding of the weft yarn in weft feeding devices for weaving looms, comprises--mounted in a casing--an electromagnetic coil and an armature mobile therein. The armature comprises a shank, at least partly constituted by a piece of stainless steel cable and a head of ferrous material fixed to the shank by rolling and/or plastic deformation. The head is urged, on activation of the coil, to strike against a stopping plate interposed between the casing and its closure cover, against the action of a return spring and by way of a damping washer carried by the plate.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: December 30, 1986
    Assignee: ROJ Electrotex, S.p.A.
    Inventor: Bruno Maina
  • Patent number: D309315
    Type: Grant
    Filed: April 12, 1988
    Date of Patent: July 17, 1990
    Assignee: Roj Electrotex S.p.A.
    Inventor: Bruno Maina
  • Patent number: D309614
    Type: Grant
    Filed: April 12, 1988
    Date of Patent: July 31, 1990
    Assignee: ROJ Electrotex S.p.A.
    Inventor: Bruno Maina