Murata Kikai Kabushiki Kaisha

Murata Machinery, Ltd.

Michiaki Fujiwara

Koshi Noda

Shoji Sakai

Nobunori Kubota

Toshifumi Morihashi

Teruo Nakayama

Shinichi Nishimura

Teiji Nakahara

Makoto Uramoto

Toshiharu Ikeda

The shaft,of a top roller T of a drafting device D is segmented into sections. The bearing holding section,includes a large diameter section at the base end and small diameter section,&prime; on the far end. A first bearing,is fitted over the large diameter section, and a second bearing,having a total diameter equivalent to the first bearing,is fitted over the small diameter section

Top roller of a drafting apparatus

When a roller cylinder of a top roller is installed, it may collide against an outer bearing and damage it. Since the roller cylinder is loosened, when drafting is executed at a high speed, the roller cylinder may vibrate, causing non-uniform drafting. A pre-loading spring 30 is installed between an inner bearing 20 and an outer bearing 21 and on the inner circumferential side. Due to the elastic force of the pressurizing spring 30, inner rings 20b and 21b of the bearings rotate integrally with a shaft 10. When the roller cylinder 12 is installed, if it collides against the outer bearing 21, the pre-loading spring 30 acts as a buffer to prevent damage to the bearings. O-rings 31 and 32 installed between outer rings 20a and 21a of the bearings 20 and 21 fill the gap to prevent the roller cylinder 12 from loosening. As a result, uniform drafting can be executed at a high speed.

Top roller for a draft apparatus

In a spinning device or a yarn splicing device, respective ends of first and second yarn portions are transferred toward respective first and second untwisting devices. An untwisting operation of the second untwisting device is started and continues for a first time period. An untwisting operation of the first untwisting device is started at the lapse of the first time period.

Method of operating a spinning apparatus and a yarn splicing device

In doubling two yarns to wind it on a package, a splicing part is displaced between a splicing part of one yarn and a splicing part of the other yarn so as to present a deviation in phase when the yarns are doubled, single yarns are used to make splicing, after which the yarn is wound on the package.

Yarn splicing method

A spinning apparatus which includes a drafting device, a twisting device and a take-up device is constituted such that the spinning apparatus further includes a guide device for guiding the fiber bundle in the separated condition in a plurality of rows and the twisting device includes a plurality of rows of twisting mechanism which can twist a plurality of rows of fiber bundle at a time.

Spinning method and spinning apparatus

A spinning apparatus of the type which includes a large number of spinning units provided in a juxtaposed relationship, and a yarn splicing bogie for traveling along the spinning units to effect a yarn splicing operation for the spinning units. Each of the spinning units includes a drafting device, an air jetting nozzle for applying a twist to a fiber bundle drafted at the drafting device, and a winding device for winding a yarn spun out from the air jetting nozzle, and a yarn splicing device on the yarn splicing bogie is formed as a pneumatic yarn splicing device.

Spinning apparatus

A spinning machine including a plurality of spinning units having a yarn detecting device, respectively, and a knotting truck disposed to be movable along the spinning units further provides detecting device for detecting the yarn joining operation of the knotting truck, an arithmetic part for counting the times of the yarn joining operation and device for indicating the percentage of successful joining.

Spinning machine

A yarn end sucking and holding device for a package mounted on a winder. The yarn end sucking and holding device has a suction mouth with a slit formed thereon in parallel with the direction of axis of a package facing to a layer of yarn on the package and a engagement member in the form of a blade is fixedly fitted to a side wall of the suction mouth.

Yarn end sucking and holding device in winder

A draft device for a spinning machine comprises a plurality of pairs of a top roller and a bottom roller, a draft cradle for supporting shafts of the top roller and a belt tenser. Top roller shafts are supported by a top roller support which is rotatably supported on a frame at one end thereof and side plates for fitting the top roller shafts therein, and spring members for pressing the roller shafts are disposed within the top roller support. A tenser of the belt tenser has an engaging portion wherein the top roller shaft is loosely fitted.

Draft device

A spinning machine wherein a yarn knotting truck having a knotter provided thereon travels in a truck travelling spacing provided along a number of spinning units further includes an apparatus for automatically doffing winding packages which have yarns fully wound thereon. A doffing truck which has provided thereon a doffing apparatus travels in the truck travelling spacing.

Spinning machine with a doffing apparatus

A device for the uniform retrieval of yarn ends in an air spinning device. A suction force gradient is created between the air jet nozzle and the waste suction pipe. Gravitational force and the suction gradient cause broken yarn ends to drop from the air jet nozzle orifice toward the waste suction pipe. When yarn piecing is desired, a piecing suction pipe retrieves the yarn end from the nozzle orifice.

Method of guiding yarn end in air spinning apparatus

An air nozzle for spinning yarn is positioned adjacent a pair of drafting rollers. The space between a cap covering the nozzle and the nozzle itself forms a tank for the air to be jetted through the nozzle. A tapered throttle located behind the nozzle reduces resistance to air exiting from the jetting ports.

Air spinning nozzle unit

A yarn slacking apparatus for slacking and retaining a fed yarn therein during the knotting operation in a winder. The sucking action is caused in the slack tube only when the knotting operation is carried out, while the sucking action of the slack tube is stopped by means of providing a shutter means for an opening of the slack tube, when the knotting operation is not conducted.

Apparatus for slacking yarn in winder

A drafting device in a spinning machine including a cylindrical sliver guide and an adjusting guide for reshaping and controlling the sliver, and a traverse mechanism for an apron supported on the middle roller. The sliver guide is disposed in front of the back rollers and the adjusting guide is arranged between the back rollers and the middle rollers.

Drafting apparatus in spinning machine

A spinning apparatus provided with a knotting truck moving along many spinning units. The knotting truck includes a yarn breakage detecting mechanism detecting a yarn breakage indicating plate of a unit where slub yarn breakage occures and a detecting mechanism detecting an impediment signal display plate of a unit where natural yarn breakage occurs. The knotting truck is only stopped at the position of the unit where slub yarn breakage occurs.

Growing community of inventors

Kameoka, Japan

Michiaki Fujiwara