US1348965A - Mounting for shuttle-operating levers - Google Patents

Description

-fizdewiar-x H. E. SMALLBONE.

APPLICATION FILED MAY 15, 1919.

Patented Aug. 10, 1920.

MOUNTING FOR SHUTTLE OPERATING LEVERS.

UNITED STATES PATENT OFFICE.

HARRY E. SMALLBONE, OF BUFFALO, NEW YORK, ASSIGNOR TO KING- SEWING MACHINE COMFANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

MOUNTING FOR SHUTTLE-OPERATING LEVERS.

To all whom it may concern Be it known that I, HARRY E. SMALLBONE, a citizen of the United States, residing at Buffalo, county of Erie, State of New York, have invented a certain new and useful 1mprovement in Mountings for Shuttle- Operating Levers, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

A common form of actuating means for reciprocating shuttles in sewing machines is a U-shaped lever one of the arms of which is long enough to extend the entire length of the sewing machine head while a connecting portion stands in an upright position in the hollow vertical portion of the arm. It is essential that the shuttle be securely supported so as always to remain at a predetermined distance from the under side of the throat plate; and the shuttlesupporting lever should therefore be mounted in such a way that it may be accurately adjusted and securely held in position. Accurate adjustment may be secured by means of upper and lower alined conical bearings which are themselves adjustable from and toward each other. The bearings must of necessity be in the vicinity of the vertical part of the lever so that the free end of the long arm which carries the shuttle lies at a distance from the lower bearing practically equal to the length of the head. As a result, unless the lever is made very strong, and therefore heavy, it is comparatively easy for the lever to spring and be lifted slightly from its lower bearing; thus dislocating the shuttle in the vertical direction. The object of the present invention is so to mount a lever of the character described that it will be held upon its lower bearing without being made heavy and cumbersome.

The various features of novelty whereby my invention is characterized will hereinafter be pointed out with particularity in the claims; but, for a full understanding of my invention and of its object and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawing, wherein:

Figure l is a vertical section through one Specification of Letters Patent.

Patented Aug. 10, 1920. Serial No. 297,272.

end of a sewing machine head containing a shuttle-operating lever mounted in accordance with my invention; and

Fig. 2 is a section taken approximately on line 2 '2 of Fig. 1, illustrating only the lower portion ofthe head.

eferring to the drawing, 1 represents the upright portion of the arm of the sewing machine head, across the upper end of which extends the horizontal crank shaft, 2. The shuttle-operating lever comprises an upper horizontal arm, 3, a lower horizontal arm, 4:, anda vertical portion, 5, lying within the part 1. The upper arm of the lever is suitably engaged with the crank shaft so as to oscillate the lever about a vertical axis. In order to support the lever so as to permit it so to oscillate, there is an upper conical bearing, 6, engaging with the free end of the arm 3 of the lever, and a lower conical bearing, 7 engaging with the arm 4. The member 7 is preferably in the form of a plug screwed into a supporting bracket, 80, so that it may be adjusted up and down. Passing axially through the member 7 is a stud or bolt, *8, having at its lower end a head, 9. At a point above the upper end of the bearing .7 there is a set screw, 10, carried by the arm 4 of'the lever and engaging with the upper end of the bolt or stud and thus, as it were, tying the arm 4 down upon the conical bearing, since the head on the lower end of the stud or bolt will prevent the arm 4 from moving upwardly off of the bearing. By employing a set screw, instead of some means which tend to draw the arm down upon the bearing, there is no danger of interfering with the adjustment of the bearing after it has once been made, because the stud or bolt and the cooperating set screw serve simply to fasten the parts in any adjusted position into which they may he brought and can serve only the intended purpose of preventing the lever from rising more or less from the lower bearing.

While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to the exact structural details thus illustrated and described; but intend to cover all forms and arrangements which come with in the terms employed in the definitions of my invention constituting the appended claims.

I claim:

1. In combination with a sl'1uttle-operating lever comprising an upper horizontalarm connecting member between corresponding ends of said arms; an' upper pivotal bearing bearing to hold saidlever against upward.

movement thereon.

2. The combination with a shuttle-operate arm, a long horizontal lower, arm, and an upright connecting member between correspondi'ng ends of said% arms;. an upper pivotal bearing n the v1c1n1ty of theiree end ofthe upperarm; a .statlonaryv support; a

lower pivotal bearing mounted, in saidsup port in axial alinement with the upper bearmg and servmgiboth to. sustain. the weight a lower horizontal arm, and an upright arm,

mg lever comprising; a horizontal upper of the lever and as a pivotal center, a stud passing axially through said lower pivotal bearing and having'a head at its lower end, and a set screw securing the upper end of said stud to the lower arm of saidlever.

3. The"combination with a shuttle-operating lever comprising a horizontal upper ahorizontal longer lower arm; and an upright connecting member between corresponding ends of said arms; an upper pivotal bearing in the vicinity ot the free end of theupper arm; a stationary support below said: lower arm; a lower pivotal, bearing member mounted in said support below said alinementwith saidlower arm and in axial upper bearing member s0 as to.- be adjustable in. the vertical. direction; and a tie member extendingbetween: said. lower bearing memher. and said lower armto hold the arm upon said bearing member.

In testimony whereof I sign this specification.v

HARRY E. SMALLB'ON'E.

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