US 5,740,666 AGranted

Method and system for controlling the rotational speed of a rotary ring member

OwnerHiroshi Yamaguchi, Masashi Yamaguchiinventors

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Abstract

The present invention provides a unique method and system for automatically controlling the motion of a rotary ring twisting and winding device, provided with a rotary ring member rotatably mounted on a holder by way of a bearing mechanism, which is utilized for textile machines having a so-called ring traveller twisting and winding mechanism. The present invention is characterized in that the rotational speeds of the rotary ring member and spindles are continuously detected, and the detected rotational speed of the rotary ring member is compared with the desired rotational speed of the rotary ring member which is calculated by multiplying a predetermined ratio by the detected rotational speed of the spindles, and if it is detected that the rotational speed of the rotary ring member is out of control, the rotational speed of the rotary ring member is electrically controlled to return to a condition of satisfying a predetermined allowable controlled condition. The present invention is preferably applied to two types of rotary ring twisting and winding devices, one of which is provided with a magnetic bearing as the above-mentioned bearing mechanism, while the other one is a device provided with a ring motor for positively rotating the rotary ring member.

Claims12

Dependent claims

A method for automatically controlling motion of a plurality of rotary ring devices in a textile machine during a period for producing a plurality of full packaged cops, said textile machine having a plurality of spindles and a mechanism for controlling a common rotational speed of said spindles according to a predetermined program by which said common rotational speed is forced to change during said period, said plurality of rotary ring devices being arranged along an alignment of spindles in cooperation with respective ones of said spindles, individual ones of said rotary ring devices having a rotary ring member capable of coaxially rotating with a corresponding spindle, a magnetic bearing rotatably supporting said rotary ring member, a traveller capable of running on a circular running trace formed by said rotary ring member, and means for electrically controlling braking action of said magnetic bearing so that a rotational speed of said rotary ring member is controlled, comprising

(a) initially setting a control program of a variable ratio between a standard rotational speed of rotary ring members of a group of rotary ring devices and said common rotational speed of said spindles, in a condition that the rotational speed of respective ones of said rotary ring members does not exceed a rotational speed of said traveller,
(b) continuously detecting said common rotational speed of said spindles and the rotational speed of each one of said rotary ring members of said group of rotary ring devices,
(c) computing a desired rotational speed for said respective ones of said rotary ring members by multiplying said variable ratio by said detected common rotational speed of said spindles, where said ratio is defined as an exact time when the rotational speed of the respective ones of said rotary ring members is detected,
(d) comparing said detected rotational speed of the respective ones of said rotary ring members with said desired rotational speed of said rotary ring members of said group of rotary ring devices,
(e) electrically adjusting braking action of said magnetic bearing of said rotary ring members of said group of rotary ring devices when said comparison indicates that the rotational speed of said rotary ring member of said rotary ring device is outside a predetermined acceptable range of control whereby said rotational speed of said rotary ring member is controlled to satisfy said predetermined acceptable range of control.

2 more elements

A system for automatically controlling motion of a plurality of rotary ring devices in a textile machine, said textile machine having a plurality of spindles and a variable rotational speed control mechanism mounted thereon, at least one ring rail arranged along an alignment of said spindles, said plurality of rotary ring devices being arranged on said ring rail along an alignment of said spindles in cooperation with respective ones of said spindles, individual ones of said rotary ring devices having (i) a holder rigidly mounted on said ring rail in coaxial condition to a corresponding spindle, (ii) a rotary ring member rotatably mounted on said holder in coaxial condition by way of a bearing, (iii) a traveller capable of running on a circular running trace formed by said rotary ring member, and (iv) means for electrically controlling rotational speed of said rotary ring member, said system comprising:

memory for storing a variable ratio .alpha. between a rotational speed of said rotary ring member and a common rotational speed of spindles,
means for continuously detecting a common rotational speed of spindles S, means for continuously detecting a rotational speed R of said rotary ring member of each rotary ring device separately,
means for calculating a desired rotational speed R.sub.j by multiplying said variable ratio .alpha. by said detected common rotational speed of spindles S,
means for comparing said desired rotational speed R of said rotary ring member detected by said detecting means,
with said desired rotational speed R.sub.j calculated by said calculation means at an identical time when said rotational speeds of said rotary ring member, and said common rotational speed of said spindles are detected,
means for electrically controlling said rotational speed of said rotary ring member of a particular rotary ring device wherein an output signal of said comparision means detects a condition in which said detected rotational speed R does not satisfy an allowable condition defined based upon said desired rotational speed R.sub.j of said rotary ring member, whereby said rotational speed of said rotary ring member of said particular rotary ring device is returned to said allowable condition.

3 more elements

Dependencies are inferred from the claim text.