US2619790A - Twisting tube assembly for textile machinery - Google Patents

Description

Patented Dec. 2, 1952 TWES'EING WBEA S MB or TEXTILE MACHINERY William l lardacre, Bradley, near Keighley and Edgar Beaumont,

Great Horton, Bradford,

England, assignors to CourtauldsLimited, Lon-- don, gland, a Britis ompany Appl emb r 26 13. .1 v Sc ii lNa'25,1:8

In Great Britain January 2, 19 51 This invention relates to textile drawing, twisting, doubling and spinning machinery for processing natural fibres such as cotton, wool, flax or hemp or artificial fibres such as viscose rayon fibres, in the form of a thread or yarn, hereinafter referred to generally as a thread.

3 Claims. (01. 575128).

In the drafting of textile rovings or slivers, it

is known to pass the roving or sliver as it travels to the collecting can through a false twisting tube so that the roving or sliver is first twisted in one direction and is then untwisted in the opposite direction so that the collected roving or sliver is free from twist. In the twisting of thread by the cap, the ring or the flyer systems, it has been proposed to pass the thread from the last pair of drafting rollers through a pretwisting tube from which the pretwisted thread passes to a collecting bobbin on which it is laid by the cap, ring or flyer. Thus British patent specification No. 24,136/1902 describes a twisting tube in the form of a rotatable pipe having a curved bore.

The pretwisting of the thread by the twisting tube takes place before any winding strains are exerted on the thread and not only permits the use of higher delivery and collection speeds but also ensures that the thread is maintained under an even tension during the actual twisting operation. However, the twisting tubes as hitherto employed have been of complicated structure, have been expensive to produce and moreover when a thread breaks, the rethreading of the tube, usually referred to as piecing up, has been a troublesome operation.

United States patent specification No. 2,556,919 describes a twisting tube for use in the drawing, twisting, doubling and spinning of threads comprising a rotatable member formed by an assembly of two or more components which are so grooved or channelled that the member has a continuous, smooth, wholly internal channel so shaped that thread passing through the channel will be deflected solely by the walls of the channel from the axis of rotation of the member. Such tubes may be pieced up by means of a flexible wire which can be pushed very easily through the channel, if desired while the tube is still rotating.

The object of the present invention is to provide a twisting tube having a simplified drive.

According to the present invention, a twisting tube assembly comprises a single rotatable tube which is so curved that both the entrance and exit holes are concentric with the axis of rotation of the tube and part of the channel within the tube is eccentric to the axis of rotation of the tube so that a thread cannot pass through the tube without being deflected from the axis of rotation solely by the walls of the tube, a driving wharl surrounding the said tube and a single bearing housed within the wharl at or substan-- tially near to the middle of the wharl. In a preferred form of the invention, the single tubehas a straight part and a curved part of sufficientcurvature to deflect the thread, and the driving wharl surrounds the straight part of the tube..

The tube is conveniently constructed of steel.

ply, that the risk of oil flowing from the hearing is prevented or minimised. The entrance hole of the tube is also preferably made funnel-- shaped to assist in guiding the thread into the: tube and in preventing fly from entering the: v

tube.

A twisting tube assembly in accordance with: the present invention is illustrated in the accompanying drawing which is a vertical Cl0SSSeC- tion through the assembly.

Referring to the drawing, the assembly com-- prises a steel tube I having an upper straight part 2 and a lower curved part 3 such that a thread passing through the tube I will be deflected by the curved surface of the part 3. The tube l is pressed and sealed into a housing 4 which in turn is pressed into a pulley or wharl 5 housing a ball race 6. A stationary pillar I surrounds the upper part 2 of the tube l and a lock nut 8 holds the assembly on a mounting plate 9 secured to the machine frame (not shown); the pillar I has a funnel-shaped entrance lil which serves to prevent the entrance of fly into the tube I. A spacing collar II is secured to the plate 9 to centralise the race 6. The nut 8 has an oil-channel I2 leading, by way of a hole in the plate 9 and grooves in the collar l I into an oil well I3 the lower part of which is sealed off by the joint between the tube 1 and the housing A. The capacity of the oil well is made large compared with the oil requirements of the race 6 so that during running any excess oil will be thrown by centrifugal force on to the sides of the well [3 and will then be maintained within the well. The lower edge of the tube l is held centrally within the housing 4 by a rubber ring l4.

What We claim is:

1. A twisting tube assembly comprising a single rotatable tube which is so curved that both the entrance and exit holes are concentric with the axis of rotation of the tube and part of the channel within the tube is eccentric to the axis of rotation of the tube whereby a thread cannot pass through the tube without being deflected from the axis of rotation solely by the walls of the tube, a driving wharl surrounding the said tube and a single bearing housed within the wharl in the vicinity of the middle of the wharl.

2. A twisting tube assembly comprising a single rotatable tube the entrance and exit holes of which are concentric with the axis of rotation of the tube, the said tube having a straight part and a curved part of such a curvature that part of the channel is eccentric to the axis of rotation of the tube whereby a thread cannot pass through the tube without being deflected from the axis of rotation solely by the walls of the tube, a driving wharl surrounding the straight part of the said tube and a single bearing housed within the wharl in the vicinity of the middle of the wharl.

3. A twisting tube assembly comprising a single rotatable tube the entrance and exit holes of which are concentric with the axis of rotation of the tube, the said tube having a straight part and a curved part of such a curvature that part of the channel is eccentric to the axis of rotation of the tube whereby a thread cannot pass through the tube without being deflected from the axis of rotation solely by the walls of the tube, a housing into which the said tube is secured, a driving wharl secured to the said housing so that it surrounds the straight part of the tube and a single bearing housed within the wharl in the vicinity of the middle of the wharl, the said tube, housing and driving wharl being so constructed and secured together to provide an oil well within the driving wharl whereby the bearing can be lubricated.

' W. HARDACRE.

E. BEAUMONT.

No references cited.

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