Murata Kikai Kabushiki Kaisha

Murata Machinery, Ltd.

Kenji Baba

Yuji Imamura

Yutaka Okimura

Hisakatsu Imamura

Katsuya Tanaka

Satoshi Enami

Shinichi Satomi

Osamu Hirao

Masaki Oka

A core yarn manufacturing apparatus includes a draft device that drafts sheath fibers of a core yarn and a core fiber supply device that supplies core fibers of the core yarn, wherein a feed-out path of the core fibers in the core fiber supply device is inclined above the draft device in such a manner that a front of the feed-out path is lower than a rear of the feed-out path with respect to a front surface of a machine frame, and wherein a CSY wind-out device and a CFY yarn guide are provided in a rear upper part of a base frame of the core fiber supply device, the wind-out device supporting a CSY package and winding out an elastic yarn, the yarn guide guiding a filament yarn drawn out from a CFY package located behind the core fiber supply device.

Core yarn manufacturing apparatus

A piecing method for a spinning machine wherein, following stoppage of the spinning operations, after cutting the sliver (S) between the usually rotating draft rollers (13) and the stopped draft rollers (12) and before the restarting of drafting and spinning, the sliver (S) is once again cut between the usually rotating draft rollers (13) and the stopped draft rollers (12) by driving the stopped draft rollers (12) for a predetermined period of time and then stopping again, thus sliver (S) is supplied to the twisting part (2) by then driving the stopped draft rollers (12). Therefore, not only can the sliver fiber density of the sliver end supplied to the piecing area during piecing be increased, but that length of the tip of the sliver can also be shortened. Accordingly, the strength of the piecing part is increased and the length of the piecing part can be shortened.

Piecing method for a spinning machine

A spinning apparatus having a spinning section for forming yarn by applying a rotating air current of predetermined air pressure to a supplied fiber bundle and twisting the yarn while opening an end of the fiber bundle, and having a piecing section for reverse threading a spun yarn end into that spinning section. The spinning apparatus has a high pressure application member for applying high pressure air at a pressure higher than the aforementioned predetermined air pressure to such fiber bundle during the predetermined time after the spun yarn end is reverse threaded into the spinning section. The high pressure application member includes a first air circuit for supplying the aforementioned predetermined air pressure, a second air circuit that supplies air at a pressure higher than the aforementioned predetermined air pressure and a change-over member between the first and second air circuits.

Method of and apparatus for spinning and piecing yarn

A yarn traverse apparatus method in which two sets of an upstream yarn guide engaged with a first reciprocating spiral groove R-turned within a width of a take up traverse above and below a travel direction of a yarn to always guide the yarn and a downstream yarn guide engaged with a second reciprocating spiral groove R-turned beyond the take-up traverse width to guide the yarn at opposite ends of the take up traverse width are arranged.

Traverse method for yarns

The present invention provides a yarn traversing device for traversing a yarn by reciprocating first and second yarn guides respectively along first and second helical cam grooves, comprising a helical cam roller provided with the first and second helical cam grooves each consisting of a substantially linear active traverse groove and a return traverse groove having two curved reversing sections connected respectively to the opposite ends of the active traverse groove. The first and second yarn guides engage the first and second helical cam grooves, respectively, and are disposed one above the other with respect to the running direction of the yarn.

Growing community of inventors

Kyoto, Japan

Kenji Baba