US3748842A

US3748842A - Apparatus of driving spinning for false twisting yarn

Info

Publication number: US3748842A
Application number: US00139052A
Authority: US
Inventors: N Kodaira; N Motegi
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-04-30
Filing date: 1971-04-30
Publication date: 1973-07-31
Anticipated expiration: 1990-07-31

Abstract

Apparatus for driving a spinner for the false twisting of yarn. The apparatus includes a drive roller consisting of a pair of discs arranged with a space therebetween, a spinner of high permeability metal which is rotated at high speed due to its rolling contact with said drive roller, and a rare earth (e.g. samarium) cobalt magnet supported on a standard which is placed in the space between the discs. The magnet has opposite pole plates and an intermediate portion of the spinner is drawn towards the magnet poles as a result of which the opposite ends of the spinner are brought into contact with the discs.

Description

United States Patent [1 1 Kodaira et a1.

[ APPARATUS OF DRIVING SPINNING FOR FALSE TWISTING YARN [76] Inventors: Nobuhisa Kodaira, 2-7-10 Karnirenjaku, Mitaka-shi, Tokyo; Norio Motegi, 1-2-8 Sakura, Setagaya-ku, Tokyo, both of Japan [22] Filed: Apr. 30, 1971 [211 App]. No.: 139,052

[ 56] References Cited UNITED STATES PATENTS 3,232,037 Crouzet .t

3,578,751 5/1971 Kodaira et a1. 57/77.45 3,308,614 3/1967 Stahlecker 57/77.45 3,465,509 9/1969 Parker et a1. 57/77.45

[ July 31, 1973 3,267,657 8/1966 Kunzle etal ..57 77.45 3,058,289 10/1962 Raschle ..57/77.45x

Primary ExaminerDonald E. Watkins Attorney-Emanuel R. Posnack 5 7] ABSTRACT Apparatus for driving a spinner for the false twisting of yarn. The apparatus includes a drive roller consisting of a pair of discs arranged with a space therebetween, a spinner of high permeability metal which is rotated at high speed due to its rolling contact with said drive roller, and a rare earth (e.g. samarium) cobalt magnet supported on a standard which is placed in the space between the discs. The magnet has opposite pole plates and an intermediate portion of the spinner is drawn towards the magnet poles as a result of which the opposite ends of the spinner are brought into contact with the discs.

10 Claims, 6 Drawing Figures APPARATUS OF DRIVING SPINNING FOR FALSE TWISTING YARN FIELD OF INVENTION This invention relates to apparatus for driving a spinner for the false twisting of synthetic yarn in which the spinner is supported by magnet means mounted on a standard and rotated by a drive roller.

BACKGROUND Many devices of the above-noted kind are known and are provided with an Alnico magnet (alloy of aluminum, cobalt and nickel) or a ferrite magnet (barium ferrite, strontium ferrite) as a result of which their structure is complicated and large in size. This causes difficulty in handling and adjustment in the mounting of the apparatus.

When an Alnico magnet is used, its residual magnetic flux density in the second quadrant of the BH curve amounts to 8,000 to 12,000 gauss, its coercive force is about 500 to 700 oersteds, and its reversible magnetic inductive rate approximates 4. Therefore it is usual to give the magnet a horseshoe shape so that its cross sectional area is decreased. As an example, two horseshoe magnets can be arranged in parallel, each having a 1.4 cm cross sectional area and a cm. length and can be, at each of its ends, provided with a magnet pole to guide two magnets. These magnets thus have to be placed at the upper and lower circumferences of the associated roller. This makes the structure very complicated and of high cost. Also, this makes it difficult to adjust the vertical alignment of the ends of the magnetic poles and maintain a gap with the spinner.

Also, when a ferrite magnet is used, its residual magnetic flux density in the second quadrant of the BH curve is about 2,000 to 4,000 gauss, its coercive force is about 1,800 to 2,200 oersteds, and its reversible magnetic inductive ratio is about 1.2 to 2 so that its cross sectional area must be comparatively larger, its shape is flatter, and its length is a fraction of that of an Alnico magnet. This magnet may be, for example, placed in an annular groove formed between the outer circumference of spinner driving rollers and the associated shaft. However, unless its length is larger than the thickness of the roller, effective results cannot be attained. There is also difficulty in supporting the magnets and in maintaining the vertical alignment of the ends of the magnet poles and a gap with the spinner. Moreover, the cost of the magnet itself may be cheaper, but the arrangement costs more as a whole. As an example, there may be considered a ring shaped magnet which is 4 cm. in outer diameter and 2 cm. in inner diameter and 3 cm. in height. When this ring shaped magnet is placed in an annular groove ofa driving roller, the core metal of the drive roller being electrically conductive aluminum for reducing its weight, with aluminum discs, which are rotated at high speed, surrounding the magnet, turbulent eddy currents flow in the discs which act as a brake on the driving power of the roller. This brake loses about 0.3 to 0.4 times the rotating power of the roller which is a great loss to the efficiency of the apparatus. Alternatively, it necessitates the use of a drive roller with 1.3 to 1.4 times the power for normal driving.

SUMMARY OF INVENTION One object of the present invention is to provide improved apparatus for driving a spinner for the false twisting of synthetic yarn which apparatus is of more compact size than those made of Alnico magnets or of ferrite magnets.

Another object of the present invention is to provide an improved spinner driving apparatus of simplified structure and with respect to which it is easy to adjust the direction and position of the magnet on its mounting.

A further object of the present invention is to provide means to prevent eddy current flow in the core metal of the drive roller.

The present invention is characterized in the use of a samarium cobalt magnet (Sm C05) having high residual magnetic flux density and coercive force in which no power loss is produced due to eddy current. Recently an alloy magnet, in which there is an atomic proportion of rare earth element to cobalt of 1:5 and having high residual magnetic flux density and coercive force and containing maximum energy, has been found. Of these, the most suitable is samarium cobalt (SM C05) having a large magnetic anisotropy field and a high Curie temperature. This is a very strong magnet whose maximum value of physical property is about 9,000 gauss in residual magnetic flux density and 9.000 oersteds of coercive force, the maximum energy product being 20 mega-gauss-oersted or more. Its reversible permeable rate approximates 1.1 and 1 and, in the second quardrant of its BH curve, its lines are straight rather than curved. When this magnet is used in said spinner driving apparatus, its length may be a tenth of that of an Alnico magnet and its cross sectional area may be a fraction of that of a ferrite magnet. It is not demagnetized by outer magnetic disturbances, and may be of sufficient strength with a smaller size. This enables the use of a very small cylinder or rectangular shaped magnet having a small pole at each of its opposite ends. Thus the apparatus may be made with compact size and adjustment at the time of mounting is very easy.

Besides this samarium magnet, there is a white gold cobalt magnet, but this is less efficient than said samarium magnet and is far more expensive to put into practical use.

Considering its lightweight as well as its simple structure and easy mounting, despite the fact that the magnet itself is somewhat high in cost, it is ultimately far cheaper considered as a whole. For producing as much effect as the known apparatus, it is sufficient to use a magnet having a 1 to 1.5 cm. cross sectional area and about a 1 cm. length.

BRIEF DESCRIPTION OF DRAWING The present invention will become more apparent as the description proceeds with reference to the accompanying drawing in which:

FIG. I is a longitudinal sectional view of an apparatus for driving a spindle for the fase twisting of yarn in accordance with the present invention;

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a part of the apparatus in FIG. I seen from the right;

FIG. 4 is a sectional view taken along line IVlV in FIG. 2;

FIG. 5 is a plan view of an apparatus in accordance with another embodiment of the present invention; and

FIG. 6 is a sectional view taken along line VI-Vl in FIG. 5.

DETAILED DESCRIPTION Referring now to FIG. 1, numeral 1 indicates a standard for supporting a driving roller through a bearing 2 with a nut 3.

Element 4 is a roller consisting of a pair of discs made of urethane elastomer arranged one above the other in rolling contact with a driven spinner. A magnetic means is placed in the groove formed between the discs and is secured to the standard so that no portion of the magnetic means contacts the roller.

Element 5 is a spinner made of a high permeability metal material. The spinner has in its center an axial bore and at one end of the bore a sapphire pin 12 is provided to facilitate the twisting of yarn. The spinner may be made to have a uniform outer circumference. However, as illustrated, it is preferable to make its intermediate portion confronting the magnet pole plates with a slightly larger diameter than the end portions contacting the discs whereby, when the spinner is rotated with an up and down movement, due to an increase of magnetically attractive area, the spinner will be supported in proper position and will not leave the discs. Also, the increase in relative confronting area with respect to the magnet pole plates will result in more attractive force with respect to the spinner, this enabling retaining even a slender spinner in stable condition.

Element 6 is a samarium cobalt magnet placed between the discs. To maintain an inductive force in the range of 300 to 500 grams at the magnet pole plates to press the spinner to the discs, a magnet flux density in the gap between the magnet pole plates and spinner will be required in the range of 15,000 to 20,000 gauss for which the cross sectional area of the magnet will be sufficient at l to 1.5 cm. and with a length of about 1 Element 7 is an upper pole plate which is made of high permeability metal, one end of which is shaped as a cone or triangle close to the spinner.

Element 8 is a lower pole plate similarly made of high permeability metal, one end of which is shaped as a cone close to the spinner. As seen in FIGS. 2 and 3, the lower plate has arms oppositely extending and secured by screws to studs 9 mounted on the standard I. The screw holes in the studs are made with play so that the gap formed with the spinner can be adjusted.

Element 10 is a cylindrical roller mounted at the lower portion of the drive roller shaft and rotated by a belt 11 running at high speed.

Another embodiment is shown in FIGS. 5 and 6 in which same numerals as in FIGS. 1 to 4 are applied to like parts. In this embodiment, two spinners S are rotated with a single driving roller 4.

The invention is not limited to the above, but alterations and modifications may be made without departing from the spirit of this invention within the scope of the following claims.

What is claimed is:

1. Apparatus for driving a spinner for the false twisting of yarn comprising a drive roller including two discs arranged in tandem with a gap therebetween, at least one spinner of high permeability metal material arranged in rolling contact with said drive roller, and a rectangularly shaped rare earth cobalt magnet in the gap between said two discs by which said spinner is attracted into rolling contact with said discs.

2. Apparatus as claimed in claim 1 comprising two said spinners in rolling contact with said drive roller.

3. Apparatus as claimed in claim 1 comprising magnetic poles on said magnet and wherein the spinner is arranged to have an axial direction perpendicular to said magnetic poles.

4. Apparatus as claimed in claim 1, wherein said magnet is a samarium cobalt magnet.

5. Apparatus as claimed in claim 4 comprising means for rotating said roller about an axis of rotation, said magnet being located in entirety to one side of said axis and between said discs.

6. Apparatus as claimed in claim 5 wherein said magnet has a cross-section of about 1-1.5 cm

7. Apparatus as claimed in claim 6 comprising spaced pole plates of high permeability metal sandwiching the magnet therebetween and extending between said discs.

8. Apparatus as claimed in claim 7 wherein'said pole plates include triangular portions adjacent the magnet and tapering towards said spinner.

9. Apparatus as claimed in claim 8 comprising means adjustably supporting said pole plates.

10. Apparatus as claimed in claim 8 wherein said discs are of urethane elastomer and comprising a sapphire pin in said spinner.

Claims

6. Apparatus as claimed in claim 5 wherein said magnet has a cross-section of about 1-1.5 cm.2.

8. Apparatus as claimed in claim 7 wherein said pole plates include triangular portions adjacent the magnet and tapering towards said spinner.