US2078789A - Spinning spindle - Google Patents

Description

April 27, W37. s. R. BERGMAN 2,078,789

SPINNNG SPINDLE Filed Dec. 8, 1953 l d aies Patented Apr. 2.7, 1937 v 2,078,789 SPINNING SPINDLE Sven R. Bergman, Nahant, Mass., assigvnor to General Electric Company, a corporation of New York Application December s, 1933, semina. 701,478

(ci. 24a-26) 4 Claims.

My invention relates to a mounting for securing spinning spindles to a spinning frame.

At certain speeds called critical speeds the spindle shaft is distorted from the axis of rotation by centrifugal force and, while rotating in the distorted position, causes severe vibrating forces to be transmitted to the bearings in which the shaft rotates. The speeds at which the critical speeds occur dependv upon the stiffness of the shaft, the inertia of the rotating and stationary parts, and the character of the mounting which is used to secure the spindle to the spinning frame. Since it is not feasible to operate a spinning spindle at a speed low enough to avoid any criti- 15 cal speeds and, since the severe vibration caused at a critical speed renders the spindle unsafe for operating at that speed, it is necessary to choose `the normal running rangevof the spindle so that it occurs between two of the critical speeds of the a, shaft and to resiliently mount the spindle to lessen the strain on the bearings caused by the vibrations while the shaft is passing through a critical' speed. p An object of my invention is to provide an improved and simplified mounting for fastening a spinning spindle to a spinning frame.

Another object of my invention is to provide an improved mounting for resiliently securing a spinning spindle to a spinning frame in which the ,)V critical speeds of the spindle are widely separated to provide a wide speed range between th second and third critical speeds thereof.

Further objects and advantages of my invention will become apparent as the following description proceeds, and the features of novelty which characterize my invention will be pointed out withparticularity in the claims annexed to and form.- ing a part of this specification.

For a better understanding of my invention,

ing in which Fig. 1 is a perspective view of a mounting embodying my invention applied to a motor-driven spindle for spinning artificial silk or the like; Fig. 2 is an enlarged sectional view of the mounting shown in Fig. 1; and Fig. 3 is an outer *casing* I drives a vertical spindle shaft 2 carried in suitable guide and -thrust bearings in the casing. 'The spindle shaft extends above the motor casing and has a spinning device or the like, such as a bucket 3 mounted on the upper end.

reference may be had to the accompanying drawthe form of a vcylindrical ring 4 attached to the lower end or base of the motorv casing by bolts 5, thereby providing a cup-shaped enclosure on the lower portion of the motor casing. The inner 4 member 6 which acts as a supporting member is secured to the spinning frame 1 by means of a nut 3 threaded on the supporting member I5. An annulus of rubber or other resilient material II is secured between the opposed walls of members 4 and li. Parts il and 6 of the mounting are concentric with the spindle shaft 2 and have opposed walls extending along and parallel to the axis of the shaft. The resilience of the mounting is obtained from the rubber which is secured between the parts 4 and 6 of the mounting. The rubber is preferably placed between the opposed Walls of parts i and B in an uncured state and vulcanized in position While subject to pressure acting on the exposed edges of the rubber. 'Ihe pressure causes the rubber to flow and ll depressions I2 in each of the parts of the mounting to assist in holding the rubber in place. By this method of assembly, the rubber, although not actually bonded to the opposed walls, is secured between each of the walls so that there is no movement between the surface of the rubber and the adjacent wall to cause Wear on the rubber or to allow turning of the motor casing with respect to the supporting member. of the rubber may be coated with an oil or acidresisting varnish or other suitable coating which will prevent deterioration of the rubber. However, due to the shielding effect of the outer part i of the mounting, the rubber is well protected without the varnish coating.

Turning of the spindle mounting in the spinning frame is prevented by a washer 9 clamped between the frame `I and nut 8. Pins IIJ on the washer which t in corresponding holes in the The exposed edges I3 3 IIJ part 4 tends to prevent the transmission of these forces tothe bearings in which the shaft is carried. Since the mounting is relatively elastic to rocking forces, the first and second critical speeds occur at lower speeds than would be the case if the mounting were relatively rigid to. rockingk forces. The forces due to the third critical speed of the shaft tend to cause radial movement of the part 6 with respect to the part 4. This mounting is relatively rigid to forces radial to the axis of the shaft, since the forces in this direction cause compression of the rubber between the membere 4 and 6, and rubber is relatively rigid in compression. Rigidity in a radial direction is a desirable characteristic of the mounting since the third critical speed of the shaft is thereby caused to occur at a higher speed, `and the operatingv range between the second and third critical speeds is increased. With this type of mounting, it is possible to vary the resistance to rocking forces, thereby adjusting the second critical speed of the shaft, without substantially affecting the resistance to radial forces with the consequent changing of the third critical speed. It is desir- -Y able that the mounting be located at the base or lower end of the motor since a mounting which is relatively elastic to rocking forces and relatively rigid to radial forces when so placed widens the range between the second and third critical speeds of the spindle shaft.

In Fig. 3 I have shown a preferred form of my invention. The outer vpart of this mounting comprises a ring I4 secured to the base of the motor casing I by means of bolts I5, thereby providing a cup-shaped enclosure on the lower portion of the motor casing. The inner part of the mounting whichl acts as the supporting member consists of parts I6 and I1 which are secured tom gether by rivets I8 and by a bolt I9. A nut 8 cooperating with threads on the member I 6 secures the mounting to the spindle frame 'l as in the construction shown in Fig. 1. 'Ihe outer and inner members I4, and IB and I1 respectively, have substantially parallel opposed walls concentric with and extending along the axis of the spindleshaft and aring outwardly therefrom to.

form a double taper. 'I'he walls are preferably of wedge-shaped configuration, as shown in the drawing. An annulus of rubber 20, secured between the opposed walls of member I4 and members I6 and I'I, provides the cushioning action of the mounting. The mounting may be assembled by placing a strip of rubber in the uncured state between parts I4 and I6, securing part Il to part I6 by means of bolt .I9 and `rivets I8, and vulcanizing the rubber in position while subject to pressure acting on the exposed edges 2|. The exposed edges 2I of the rubbermay be coated with aprotective varnish. The action of this mounting is similar to that of the mounting shown in Fig. 2, except that the forces which tend to rock rthe motor are resisted by'combined shear and bre stress of the rubberl 2G. I find that'by varying the angle of taper in the opposed walls of the mounting, the resistance to the rocking forces produced by vibration of the spindle may readily be changed without substantially affecting the resistance offered by the mounting to radial forces. The resistance to the Yrocking forces may also be Varied by changing the thickness cf the rubber.

In the foregoing description reference is made to the first, second, and third critical speeds 'of frame or the like.

the spindle shaft. In referring to these critical speeds of the spindle shaft, it will be understood that I mean the spindle shaft in the system including the spinning bucket 3 mounted on the shaft, the motor rotor mounted on the shaft, and the stator I, all of which are carried by the rubber mounting indicated at I I or 20.

Although I have shown a particular embodiment of my invention, I do not desire to be limsure, a supporting member concentric with the axis of the shaft and extending within said ring, said ring and said supporting member having opposed walls extending along the axis of the shaft,

resilient material arranged within said cupshaped enclosure and secured between said opposed walls, and means for fastening said supporting member to a spinning frame or the like.

2. A mounting for an electric motor having a vertical spindle shaft extending therefrom comprising a ring concentric with the axis of the shaft secured to the base of the motor and cooperating therewith to form a cup shaped enclosure, a supporting member concentric with the axis of said shaft and extending within said ring, said ring and said supporting member having substantially parallel opposed walls of double frusto--conical configuration, resilient material arranged within said cup-shaped enclosure and secured between said opposed walls, and means for fastening said supporting member to a spinning frame or the like.

3. A mounting for an electric motor having a vertical spindle shaft extending therefrom comprising a ring concentric ,with the axis of the shaft secured to the base of the motor and cooperating therewith to form a cup-shaped enclosure,

a supporting member concentric with the axis of the shaft and extending within said ring. said ring and said supporting member having substantially parallel opposed walls of wedge-shaped configuration extending along the axis of the shaft, resilient material arranged within said 'cupshaped enclosure and secured between said opposed walls, and means for fastening ,said supporting member to a spinning frame or the like.

4. A mounting for an electric motor having a vertical spindle shaft extending therefrom comprising a ring concentric with the axis of the shaft secured to the base of the motor and cooperating therewith to form a cup-shaped enclosure, a supporting member concentric with the axis` of the shaftand extending within said ring, said ring and said supporting member having substantially parallel opposed walls extending along the axis of the shaft and having a double taper from the axis of the shaft, resilient material arranged within said cup-shaped enclosure and secured between said opposed walls, and means for fastening said supporting member to a spinning SVEN R. BERGMAN.

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