US1898115A - Retaining device for twister spindles - Google Patents

Description

Feb. 21, 1933.

W. O. ALDRICH RETAINING DEVICE FOR TWISTER SPINDLES Filed Dec. 26, 1929 INVENTOR BY v Y M I ATTORNEYS Patented Feb. 21, 1933 UNITED STATES PATENT} OFFICE WILLIAM G. ALDRICH, OE WHITINSVILLE, MASSACHUSETTS, .ASSIGNOR TO WHITIN MAGHIN E WORKS, 013 WHITINSVILLE, MASSACHUSETTS, A CORPORATION OF MASSA- OHUSETTS RETAINING DEVICE FOR TWISTER SPINDLES Application filed December 26, 1929. Serial No. 416,395.

This invention relates to machines for twisting yarn or thread. In twisters for certain purposes, such as twisting rayon thread, the twisted thread islaid on a sleeve or tube 5 held between a lower centering base or disc fixed to the spindle blade and an upper centering cap detachably mounted on the spindle. Difliculties have been encountered in retaining the upper cap or disc in position on the spindle when the spindle is rotated at high speed, and substantial damage has resulted from displacement of the caps.

It is the object of my invention to provide an improved device for retaining a cap or disc .on the end of a twister spindle or other similar mechanism. 1

A further object of the invention is to provide means by which the centering cap or disc is automatically locked to the spindle blade, preferably by centrifugal action when rotation of the spindle takes place.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawing, in which Fig. 1 is a side elevation, partly in section, of my improved spindle and retaining device" Fig. 2 is an enlarged sectional elevation of the retaining device;

Fig. 3 is a plan view of the'thimble which is mounted on the hub of the centering cap;

Fig. 4 is a side elevation thereof;

Fig. 5 is a plan view of the locking washer; and

Fig. 6 is a side elevation thereof.

Referring to the drawing, I have shown a portion of the frame 10 of a twisting machine having a spindle base 11 secured therein. A spindle blade 12 is'rotatable in the base 11 and is driven by a band 13 which engages the spindle whirl 14. The twisted yarn or thread is laid on a sleeve or tube 20, the lower end of which is supported and centered by a disc 21 fixed on the hub of the whirl 14 and having a depending conical outer flange 22.

At its upper end, the blade 12 is provided with an enlarged end member 30, preferably formed as a separate piece pressed firmly on the tapering end of the blade 12. The end member 30 is provided with a rounded top portion 31 and with a plurality of circumferential grooves 32. v

The upper end of the tube or sleeve 20 is centered by a cap having an inverted conical outer flange 41. The cap 40 is mounted on a hub portion 42 which fits loosely over the end member 30 of the blade 12. A thimble 44 is forced on the upper end of the hub member 42 and retains the cap 40 and hub 42 enough to pass freely over the end 31 of the member 30, and the edges of the washer around the opening 51 are sharply beveled outward and downward, as indicated in dotted lines at 53 .(Fig. 6). p i

The washer 50 is assembled between the upper end of the hub 42 and the end of the thimble 44, with the eccentric portion 52 projecting outward through the slot 48 in the side of the thimble 44. The parts are so proportioned that the washer is freely slidable between the parts 42 and 44 but is held from displacement thereby.

Having described the details of construction of my retaining device the method of operation and advantages thereof are as follows " A sleeveor tube 20 is placed on the conical flange 22 of the lower disc 21 and is firmly engaged and centered thereby. The upper centering cap 40 is then placed on the end member 30 and slides downward until its conical outer flange 41 firmly engages the upper end of the sleeve 20. As the parts are thus assembled, the endmember 30 is projected through the washer 50 and through the end of the thimble 44.

As soon as the spindle begins to rotate, centrifugal force exerted on the eccentric portion 52 causes the washer 50 to crowd toward the slot 48 in the thimble 454 and thus moves the beveled inner edge of the washer into one of the circumferential grooves 32. These grooves are provided with abrupt upper faces, so that the cap 40 cannot move upward solong as the washer 50 is engaged in any one of the grooves 32. The cap 40 is thus securely held from displacement so long as the spindle rotates.

The provision of a plurality of grooves 32 permits the cap 40 to be positioned axially in accordance with the length or diameter of a particular tube 20, and provides a locking groove adjacent the washer 50 in whatever axial position it may assume.

When it is desired to remove the cap 40, the washer 50 may be moved inward by manual pressure on the outwardly projecting portion 52 and when thus'pressed inward, the washer will be centered by engagement with the inside of the thimble l4, whereupon the cap may be removed from the end of the spindle.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is zy 1. In a twister, a spindle having a blade, a cap mounted on the upper end of said blade and having an axial opening to receive said blade, and means carried by said cap and movable by centrifugal force into engagement with said blade to thereby lock said cap to said blade during rotation of said spindle, said cap engaging and centering said locking means in inoperative position when said locking means is manually pushed radially inward. 1

2. In a twister spindle, a blade with an externally and circumferentially grooved upper end portion, means to rotate said spindle, a cap loosely fitted on said upper end portion, and a retaining device mounted on said cap and surrounding said upper end portion and said device moving to engage said grooved end portion of said blade when said spindle is placed in rotation.

3 The combination'in a retaining device as set forth in claim 2, in which a plurality of grooves are provided in said spindle blade end of said spindle blade, thereby preventing axial displacement of said cap when said spindle is rotated.

5. In a twister spindle, a blade with a circumferentially grooved upper end portion, means to rotate said spindle, a cap having an upwardly projecting hub portion, a, slotted thimble for said hub portion, and a washer loosely confined between said hub portion and said thimble and having an eccentrically disposed portion projecting outward at one side through the slot in said thimble, said washer being displaced radially outward by centrifugal force to engage the grooved end of said spindle blade when said spindle is placed in rotation.

6. The combination in a retaining device as set forth in claim 5, in which said thimble centers said washer in alignment with said spindle blade when said washer is pushed radially inward.

7. As an article of manufacture, a bobbin locking cap, comprising a body portion provided with a perforated central hub provided with a cavity, and means lying within said cavity and out of balance with respect to the central axis, whereby upon rotation of the cap around the central axis a portion of said means enters the central opening of the hub for locking purposes.

8. A locking cap for bobbins,comprising a disc-like member having a central hub provided with a cavity, and a washer-like member loosely supported in said cavity and provided with an offset portion at one side thereof adapted to move said member laterally for locking purposes upon rotation of said cap;

9. In a twister, a spindle having a blade,

a cap mounted on the upper end of said blade, and centrifugally operated means to lock said cap to said blade during rotation of said spindle, said locking means being self-centering in inoperative position whe manually pushed radially inward.

In testimony whereof he has hereunto affixed his signature.

' WILLIAM O. ALDRICH.

and in which said retaining device is engageable with any one of said grooves in accordance with the axial position in which said cap is supported on said blade.

4. In a twister spindle, a blade with a plurality of external circumferentialgrooves in its upper end portion, means to rotate said spindle, a cap loosely fitted on said upper end portion, and a retaining device mounted on said cap and actuated by centrifugal force to engage in one of the grooves at the upper

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