Kabushiki Kaisha Toyota Chuo Kenkyusho

Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

K.k. Toyota Chuo Kenkyusho

Kabushiki Kaisha Toyota Jidoshokki

K.k. Toyoda Jidoshokki Seisakusho

Susumu Kawabata

Junzo Hasegawa

Hiroshi Niimi

Kazunori Yoshida

Tetsuzo Inoue

Nobuharu Mimura

Yasuhiko Suzuki

Hajime Suzuki

Meiji Anahara

Yoshihisa Suzuki

Kazuo Kamiya

Hiroshi Omori

Yoshikatsu Kisanuki

Tadanori Kurushima

Fuzio Suzuki

Noriaki Miyamoto

Masao Shiraki

Hiroshi Arakawa

Akira Kobayashi

Takahiko Tsunekawa

Masashi Kaneko

Takuzo Tooka

Yasuhiro Miura

Mitsunori Horiuchi

Fujio Suzuki

Masanobu Shibuya

Yoshiaki Yamaoka

Masao Kitano

Masaki Akatsuka

Yusuke Itoh

Kiichi Kono

Choji Nozaki

Hiroaki Goto

A take-up rate and a let-off rate in warp feed on a loom are controlled while a displacement (.DELTA.L) of a cloth fell position C is taken into account. The system comprises a cloth fell position compensation circuit (2, 16, 21) which outputs a cloth fell compensation signal (.DELTA..omega..sub.c) to compenate a displacement (.DELTA.L) of the cloth fell position (C) when a weaving condition such as a target weft density (D*), a target warp tension (T*) or the kinds of weft and warp yarns is changed. The cloth fell compensation signal is added to a basic warp feed rate (.omega..sub.f) obtained from D*, so that the displacement motion of the cloth fell is completed in a shorter time. According to this compensation, a weft density of a resultant fabric rapidly coincides with the target weft density.

System for controlling warp take up and let off rates

A jet loom comprising a weft measuring roller for continuously drawing out a weft from a supply package, a weft storage unit for temporarily accumulating and storing the weft drawn out from the supply package by the weft measuring roller, a main nozzle for jetting air to insert the weft into the warp shed, and a driving unit for sinusoidally varying the rotating speed of the weft measuring roller. The weft stored in the weft storage unit runs in a free running period in a free running mode at a comparatively high running speed. After the stored weft has exhausted, the weft is supplied for insertion directly from the weft measuring roller, so that the weft runs in a constrained running mode at a running speed constrained by the surface speed of the weft measuring roller. When the running mode of the inserted weft changes from the free running mode to the constrained running mode, the driving unit drives the weft measuring roller so that the surface speed of the weft measuring roller is higher than a speed Vf defined by: Vf=Lo/tc, where Lo is the weft length of the loom and tc is a time necessary for one weaving cycle of the loom.

Weft insertion in jet loom

A spinning unit of an open-end spinning machine is disclosed which comprises a rotor having an inner wall, a bottom portion and an open end opposite to said bottom portion and arranged to rotate about a center axis perpendicular to said bottom portion; and a stationary closing member projecting into a spinning chamber of said rotor to thereby close the open end of said rotor and provided with a fiber supply duct which opens toward the inner wall of the rotor, and a yarn guide hole which opens in an end surface thereof opposite to the bottom portion of the rotor. The fiber supply duct is arranged in the closing member so that an inner wall of the fiber supply duct located on a side of the rotational center of the rotor is extended to be near to the rotational center of the rotor or to be over the rotational center of the rotor. The width of the fiber supply duct is established to be not larger than 90 percent of the diameter of the closing member.

Spinning unit in open-end spinning machine

A spindle apparatus is composed of a holding member to define a casing, a spindle shaft to support a rotor rotatably, a neck bearing disposed radially of the spindle shaft, a buffer disposed between the holding member and the neck bearing, an end bearing secured to the end of the holding member remote from the rotor, and a mechanism provided between the buffer and the end bearing for transmitting power from a source of power to the spindle shaft for rotating the shaft. This spindle, rotatable at a high speed without any substantial vibration or noise, is applicable to spinning machines, more particularly to an overhung rotor.

High-speed spindle

A bearing device for high-speed rotary machines comprises a first rolling-element bearing having a retainer for holding constant spacing of rolling elements inserted between an inner race and an outer race thereof and also a second bearing for supporting the retainer of the first rolling-element bearing, thereby the retainer of the first rolling-element bearing is prevented from contacting with the inner race or the outer race.

Bearing device

A method and an apparatus for producing a fasciated yarn, utilizing an air nozzle for false-twisting a fiber bundle. The apparatus is provided with a fiber passage comprising an inlet portion, a small channel, and a large channel, and is provided also with a contact area on an inner wall of the small channel, this contact area being formed by the intersection at an angle of the small channel and the large channel. During the spinning operation, the fiber bundle is forced against the contact area, effectively suppressing a twist imparted by a vortex such that it does not ascend toward the upstream region. Also, since ballooning can be suppressed by the contact area, the size of the small channel can be increased, resulting in the intake by suction of a sufficient amount of air in the inlet portion.

Method and apparatus for producing a fasciated yarn

In a driving gear of a rotor type open end fine spinning machine, a rotation shaft of a spinning rotor and a drive shaft are connected through a speed multiplying mechanism, the spinning rotor facing to a fiber feed passage and a yarn taking passage is rotated at a multiplied speed by rotation driving of the drive shaft, a cover is installed to surround the spinning rotor and the rotation shaft thereof, an air passage is constituted so that air flow to guide fibers at the fiber feed passage into the spinning rotor passes through inside of the cover and is exhausted out of an exhaust port provided on the cover, and air flow passing through the air passage eliminates the friction heat caused by rotation of the spinning rotor.

Driving gear of rotor type open end fine spinning machine

In the present invention, a plurality of fixed flats are disposed in juxtaposition to one another, and an opening 5 to 33 mm wide is formed between each pair of adjoining fixed flats, in such a manner that the dust is entrained in the discharge air current produced at the upstream side of the opening and extracted out of the opened fiber mass.

Pre-opening device for a carding machine

A weft yarn storage unit disposed between a yarn supply package and a weft insertion device for storing a weft yarn to be inserted in the warp shed, comprises a differential yarn feeding device for feeding the weft yarn from the yarn supply package, and a yarn storage means for winding the fed weft yarn therearound by co-operating with the differential yarn feeding device, storing the wound weft yarn therearound and unwinding the stored weft yarn therefrom by co-operating with the weft insertion device, the yarn storage means being continuously rotating in a direction opposite to the direction in which the weft yarn is unwound at a predetermined circumferential speed in response to an insertion speed of the weft yarn. This weft yarn storage unit allows high-speed weft insertion while preventing the yarn breakage by reducing ballooning of the weft yarn when the weft yarn is released off the yarn storage drum.

Weft yarn storage unit for jet looms

An open-end spinning unit is provided which has a spinning rotor open on one side and a bottom wall and an inner wall. A closing element covers the open side of the rotor and includes a fiber supply duct. To enhance the air conveyance of fibers to the inner wall, at least one suction opening is provided downstream of an outlet opening of the fiber supply duct in the closing element so that an airstream directed from the outlet opening toward the suction opening is generated in the same direction as the direction of rotation of the rotor. This invention is applicable not only to a forced-exhaustion type of unit but also to a self-exhaustion type of unit.

Open-end spinning unit

A fiber control apparatus in an open end spinning frame, which is a spinning rotor provided with a structure capable of producing a rotary stream by which breaking or bending of fibers or formation of floating fibers in a spinning chamber of the rotor can be effectively controlled. This structure is mainly characterized by the arrangement of the exhaust vents formed in the spinning rotor.

Fiber control apparatus in open end spinning frame

A novel fiber drafting system is disclosed, according to which fibers of sliver supplied continuously are passed through a first pair of rotatable cooperating rollers while being pressed and compacted into a reduced section by and between a space formed by a groove and a projection formed respectively in and on the circumferential peripheries of the rollers of said first pair. The sliver thus compacted is then transferred to and held by and between a second pair of rollers rotated at a higher peripheral speed than the first pair of rollers, whereby the fibers of sliver are drafted successively between the two pairs of rollers without use of conventional aprons for guiding and supporting the fibers in the drafting zone.

Method and apparatus for textile fiber drafting

A rotor type open-end spinning unit in which in order to prevent blowing of air to the rear of an outlet of a fiber transporting channel formed in a spinning body and impingement of an air stream from the fiber transporting channel against the back face of a separator, the rear end of the outlet of the fiber transporting channel on the central side of a rotor is expanded forward of an imaginary line, connected between the rear end of the channel outlet furthest from the center of the rotor and the center of the rotor, and the angle .alpha. between the face of the fiber transporting channel confronting the combing roller and the plane intersecting the axis of the rotor at a right angle is made substantially equal to the taper angle .theta. of the back face of the separator.

An apparatus for inserting a weft into a shed by jetting fluids in a jet loom comprises a plurality of thin plate-like members arranged in alignment in the direction of weft insertion on a sley, each of the thin plate-like members being provided with an opening in the same position of each of said thin plate-like members to form a guiding channel, and nozzle means for jetting fluids through the guiding channel. Each of the thin plate-like members is provided with at least one cavity which is formed adjacent the circumference of each of the openings of the thin plate-like members on a downstream sidewall, in the direction of weft insertion, of the mutually facing sidewalls thereof. Due to the formation of the aforesaid cavity, the amount of the fluid flow escaping through the space between each two adjacent thin plate-like members outside of the guiding channel without narrowing the width of the space therebetween. As a result, the flight of the weft is remarkably stabilized and the flying speed of the weft is increased with reducing the consumption of fluids jetted from nozzle means.

Apparatus for inserting a weft into a shed by jetting fluids in a jet

An air nozzle, suitable for producing a fasciated yarn, having at least one jet in each of narrow and wide passages along the traveling direction of the fiber bundle. Each jet is directed to generate a vortex whirling reversely from that of the other passage. The twist imparted to the fiber bundle by the vortex generated in the wide passage is restrained by the vortex whirling reversely thereto in the narrow passage. As a result, circumferential fibers of the fiber bundle are less twisted relative to the core portion thereof. During the untwisting operation of the vortex of the wide passage, the circumferential fibers are entangled around the core portion with a twist corresponding to the difference from the core portion, thereby obtaining a well-fasciated yarn.

Growing community of inventors

Aichi, Japan

Susumu Kawabata