US1947333A - Rotary take-up for sewing machines - Google Patents

Description

13, 1934- A. B. CLAYTON 1,947,333

ROTARY TAKE-UP FOR SEWING MKCHINES Filed Feb. 20, 1932 SUPP]. Y

T0 L OPEPS 3mm: AndrewB. C'lqyt on v A W Patented Feb. 13, 1934 PATEN'l OFFICE j ROTARY TAKE-UP FOR SEWING MACHINES Andrew B. Clayton, Union, N. J assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application February 20, 1932. Serial No. 594,167

5 Claims.

This invention relates to rotary take-ups for sewing machines, and has for an object to provide a rotary take-up with improved means for preventing breakage or deformation of the parts due to a winding of thread by the take-up.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Fig. 1 of the drawing is a side elevation, partly in section, of a rotary take-up embodying the invention. Fig. 2 is a top plan view of the takeup. Fig. 3 is a detail view of one of the threadguides, and Fig. 4 is an under edge view of the cast-off element of Fig. l.

1 represents the usual low main-shaft of a chain-stitch sewing machine carrying the usual spaced rotary take-up disks 2 formed with the hub 3 and groove 4 which receives the inclined cast-off or stripper-bar 5 having the thread-slot 6. The bottom of the groove 4 is circular and is concentric with the shaft 1. The free-end of the stripper-bar is extended beyond the shaft 1 and terminates at '7 beyond the portion of greatest diameter of the take-up disk, so as to act as a cast-off in case the take-up is accidentally turned in a direction opposite to its normal direction of rotation indicated by the arrow in Fig. 1.

Embracing the take-up 2 is the usual U-shaped thread-guiding fork 8, 8' having thread-eyes 9, 9' for the looper-threads 10. The bottom of the U of the thread-guiding fork 8, 8' is formed with a struck-up heel 8 which is pressed upon by the leaf-spring 8 to yieldingly hold the fork 8, 8' in its operative horizontal position, yet permit it to be tilted upwardly for easy threading. The shank 11 of the stripper-bar 5 is received in a horizontal groove 11 in the side of the post 15 and is formed with a slot 13 entered by the screw 14 threaded into the post 15 constituting a fixed part of the bracket 16 screwed to the bed-lug 17. The screw-and-slot fastening expedient 13, 14 permits adjustment of the castoff or stripper-bar 5 horizontally in the groove 11 toward or away from the bottom of the groove 4 between the take-up disks 2.

The thread-engaging portion of the lower or under edge of the stripper-bar 5 adjacent the bottom of the take-up groove 4 is adapted to arrest a winding of thread in such groove by being suitably roughened, toothed or serrated at 18 so that in case the take-up, for any cause, starts to wind thread in the groove 4, the wound mass of thread cannot increase in diameter beyond the diameter of the dotted circle 0, Fig. 1, tangent to the teeth 18. The device usually functions to grip and arrest the rotation of the wound thread-mass and permit the hub 3 to slip relative thereto; it being understood that the bottom of the groove 4 is substantially completely circular and smooth, so that the thread may slip relative thereto. The adjustment 13, 14 permits the teeth 18 to be set as closely as may be desired to the bottom of the groove 4, to predetermine the amount of possible winding which may occur and limit it to as small a value as may be desired.

The device effectively safeguards the stripperbar 5 against bending or deformation from the outward wedging action of a growing winding of thread in the take-up groove and eliminates the. heretofore annoying characteristic of this well known form of rotary take-up.

The thread-guide-arm 8' nearer the source of thread-supply and formed with the threadguide eye 9' is also formed with a slot 9 leading to the eye 9'. A thread-retaining hook 9 is applied to the outer side of the guide-arm 8' to keep the thread in the eye 9'.

Having thus set forth the nature of the invention, what I claim herein is:-

1. In a rotary take-up, a shaft, spaced disks on said shaft, said disks defining an intermediate groove having a circular bottom concentric with said shaft, thread-guides cooperatively related with said disks, and cast-off means including a slotted thread-guiding element in the space between'said disks having a toothed under portion adjacent the bottom of said groove.

2. In a rotary take-up, a shaft, spaced takeup disks on said shaft, said disks defining an intermediate groove having a circular bottom concentric with said shaft, thread-guides cooperatively related to said disks, and a cast-off disposed between said disks and having a threadedslot and a roughened under portion closely adjacent the bottom of said groove to stop the growth of a thread-winding in said groove.

3. In a rotary take-up, a shaft, spaced takeup disks on said shaft, said disks defining an intermediate groove having a circular bottom concentric with said shaft, thread-guides cooperatively related to said disks, and means disposed between said disks and having a toothed under portion tangentially adjacent the bottom of said groove.

4. In a rotary take-up, a shaft, spaced takeup disks on said shaft, said disks defining an intermediate groove having a circular bottom concentric with said shaft, thread-guides cooperatively related to said disks, and a cast-off in the space between said disks, said cast-off having an inclined thread-slot and a thread-gripping under edge.

5. In a rotary take-up, a shaft, spaced take- ANDREW B. CLAYTON.

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