Kabushiki Kaisha Toyota Chuo Kenkyusho

Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

Hiroshi Niimi

Susumu Kawabata

Junzo Hasegawa

Meiji Anahara

Hiroshi Omori

Yoshihisa Suzuki

Yasuhiko Suzuki

Takahiko Tsunekawa

Takuzo Tooka

Tetsuzo Inoue

Yasuhiro Miura

Yoshiaki Yamaoka

Masaki Akatsuka

Choji Nozaki

Hiroaki Goto

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 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 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

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.

Air nozzle utilized for fasciated yarn spinning

The present invention relates to a pneumatic twisting spinning apparatus comprising a drafting device for forming a fleece, a deflection roller, a pneumatic twisting nozzle for injecting air into a twisting tube to form a swirling air stream, so that the fleece can be twisted into a yarn, a take-up roller for withdrawing the yarn, and a winding roller. The deflection roller is disposed adjacent to the front roller, for varying the direction of fleece travel and supplying the fleece along an outer peripheral wall of said front roller, and separating ends of peripheral fibers from the fleece as free fibers, which will be twisted by the pneumatic twisting nozzle so as to be wound around central main fibers, thereby forming a bundled yarn.

Pneumatic twisting spinning apparatus

Sliver weight unevenness correcting apparatus of a feed-forward type has: a sliver weight measuring section for detecting the variations in weight of a bundle of slivers; a correcting draft device having front rollers disposed downstream of the sliver weight measuring section relative to the direction of advancement of slivers, the front rollers being rotated at a constant speed, and back rollers disposed between the sliver weight measuring section and the front rollers, the back rollers being rotated at a variable speed; a rotation detector for detecting the number of revolutions of the front rollers; an unevenness correcting circuit having a ratio circuit for operating a ratio (E.sub.0 /E.sub.1) between a reference sliver weight (E.sub.0) and the detected weight (E.sub.1) thereof, a delay circuit for delaying the speed control of the back rollers of the correcting draft device for a predetermined period of time, and a contrasting operational circuit for multiplying the ratio (E.sub.0 /E.sub.1) and a ratio (N.sub.F /k) between the number (N.sub.F) of revolutions of the front rollers and a reference draft value (k) and for producing a multiplied signal (E.sub.0 /E.sub.1 .multidot. N.sub.F /k); and a speed control circuit for producing a speed control signal responsive to the multiplied signal to control the speed of back rollers through a rotation transmitting mechanism. This arrangement enables accurate correction of sliver weight unevenness even short in wavelength in a drawing frame running at a high speed.

Growing community of inventors

Nagoya, Japan

Hiroshi Niimi