US2417403A - Cooling and lubricating means for sewing machines - Google Patents

Description

s. ZONIS cooLING AND LUBRICATING MEANS Fon sEwING mcnns Filed sept'. 6,1 1944 March lll, 1947.v

Patented Mar. 11, 1947 1x Nr OFFICE COLINGV AND LUBRICATI'NG; MEANS FOR SEWING lWACHINES,l

Sydney Zons, Bridgeport, Conn., assigner to The Singer Manufacturing Company,

Elizabeth,

N. J.,` a corporation ot' New Jersey Application September 6, 1944, Serial No. 552,826

6 Claims. l

an object to provide improved means for supplying a stream of air, or of oil-laden air, to the interengaging surfaces of a sewing machine rotary hook and its thread-carrier.

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 drawings of a preferred embodiment of the invention, from whichl the several features of the invention and the advantages at tained thereby will be readily understood by those skilled in the art.

In the drawings:

Figure l is a vertical section taken through a portion of a sewing machine having my invention embodied therein.

Figure 2 is an enlarged sectional view of the injector used for atomizing the oil and for injecting it into the bore of the hook-shaft.

In the embodiment of the invention selected for illustration, my improved lubricating and cooling expedient is shown embodied in a sewing machine having a frame including a bed I8 and a bracket-arm standard I I. The bed Ill is formed with depending lugs I2 and I3 supporting bearings I4 and I5 in which a hook-shaft I6 is journaledk for rotary movement.

The shaft I6 carries a rotary hook I1 having a raceway I8 which receives the bearing-rib I9 of a stationary thread-carrier 20. Fixed to the end of shaft I6 opposite the hook I1 is a pulley 2| which is driven by a belt 22 in the usual and well known manner. The shaft I6 is formed with an axial bore 23 which is connected by a conduit 24 in the hook-body to the raceway I8 in the hook. Preferably, a plurality of equally spaced conduits connect the bore 23 in the shaft I6 to the hookraceway so that a plurality of streams of air or of oil-ladened air may be forced into the raceway throughout its circumference.

The standard II is externally provided with superposed cup- shaped chambers 26 and 21 closed by a transparent cover-plate 28. An aperture 28 is formed in the cover-plate 28 so as to provide an air inlet into the chamber 21. Located within the upper chamber or oil-reservoir 26 is a plate 29 which is preferably painted white. The plate 29 is arranged parallel to the transparent coverplate 28 and is provided with upper and lower `end of the Street elbow 46..

2 holes` 38, 3l. The plate 2.9. acts asa. background so that the quantity of oil in the chamber 26 canv readily be ascertained at a glance. Y

An vopening connects the chamber 2,6 with the lower chamber 21, and screwed into the opening is a valve-seat member 32. A needle-valve stem 33, urged downwardly by a spring 34, coopera-tes with the valve-seat of the member 32 to control the flow of oil fromv the reservoir 26 to the.v chamber 21. The'valve-stem 33 extends through an adjustable bushing 35 which is threaded into the top wall of the chamber 2.554 and Xed t0. the. 11pper end of the valve-stern` is a cam-lever 3,6. It will be obvious that, by adjustment of the screw 35, the ow of oil from the chamber or reservoir 26 to the chamber 2l may be accurately controlled and that, when no oil is desired, the cam-lever 3.6 may be shifted so that the spring 34v will urge the stem 33 into contact withA the valve-seat member 32 to close. the valve.

Screwed into the lower wall of the chamber 21 is a pipe-fitting 38 which is connected by a` short pipe 39 toa T pipe-fitting 40. Threaded into one limb of the T 48 is a tube 4I of which the free end extends into and therefore communicates with the bore 23 in the hook-shaft I6. Located within the tube 4I isi a sleeve-member 42 longitudinally formed with two connected and successively larger bores 44, 43 whichy serve as expansion chambers. Extending into the smaller bore 44 is the tip end of a cone-shaped nozzle 45 which is soldered or otherwise secured to one Threaded into the other end of the elbow is a pipe 41 which is connected through a valve 48 to any suitable source of compressed air. The compressed air may come from a rotary pump or from a central compresser through pipe lines.

My improved hook cooling and lubricating device operates as follows: When the valve 48 is opened, compressed air is injected by the coneshaped nozzle 45 into the chamber 44. The expansion of the air in the chambers 44 and 43 produces a suction in the chamber 21 and this suction draws air through the aperture 28 which air combines with the oil which is fed from the reservoir 26 and carries it into the air stream directly in front of the nozzle 45. The oil is atomized by the impact of the air stream and is injected through the tube 4I into the bore 23 in the hook-shaft I6. The oil-ladened air, or oil mist, then travels under pressure through the longitudinal bore 23 and connecting conduit or conduits 24 to the raceway I8 in the hook, where it is projected against the bearing rib I8 of the points judicially selected circumferentiallyof` the raceway, there will be produced a cushioning effect upon the thread-carrier bearing rib which minimizes heating tendencies. Y

IV have shown the oil reservoir located above the injector but it is'obvious that it may be `1ocated below the injector and the suction created by the injector may be utilized to elevate the oil. It will be understood that my invention is not limited to the specic embodiment shown and that various other deviations may be made therefrom without departing from Vthe spirit and scope of the following claims.

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

1. A sewing machine having, in combination, a rotary hook shaft formed with a longitudinal bore, a hook carried by said shaft and having araceway, said hook being provided with a conduit connecting the bore in the shaft with the raceway, a thread-carrier journaled in said raceway', an air-supply line, and means for injecting a stream of air into the bore in said shaft for delivery through said conduit to said ,raceway,

2. A sewing machine having, in combination, a rotary hook shaft formed with a longitudinal bore, a hook carried by .said shaft and having a 'A raceway, said hook being provided with a conduit connecting the bore in the shaft to the raceway, a thread-carrier journaled in said raceway, and means for injectingamixture ofair and oil into the bore in said shaft for delivery through said conduit to said raceway. l Y

3. A sewing machine having, in combination, a bed, a rotary hook-shaft located below saidrbed and having a longitudinal bore, a rotary hook carried by said shaft and formed with a raceway, said hook being provided with a conduit leading from the bore in said shaftto the raceway, a thread-carrier journaled'in said hook, an airsupply line, means for directing astream of air into the bore in said .shaft for delivery to said raceway, an oil-reservoir, a chamber beneath said reservoir having an air inlet and means for feeding oil from said reservoir and air from said chamber into said stream of air.'

.4.' A sewing machine having, inY combination, a beda rotary hook-shaft located below said bed and having a longitudinal bore, a rotary hook carried by said shaft and'formed with a raceway, said hook being provided with a conduit leading from the bore in said' shaft to the raceway, a thread-carrier journaled in said hook, anv air-supply line, means for directing a stream ofV air into the bore in said shaft for delivery to said vraceway, an oil-reservoir, means for feeding oil from said reservoir into said stream of air, and

a shut-olf under control of the operator for stop--Y ping the feeding of the oil, whereby only a stream of air is supplied to the raceway of the hook.

5. A sewing machine having, in combination,

a bed, a rotary hook-shaft located below said Vbed y and having a longitudinal bore, ar rotary hook carried by said shaft and Vformed with a raceway, said hook being provided with a conduitr leading from the bore in said shaft to the raceway, a thread-carrier journaled in lsaid hook, an air' supply line; means for directing a stream of air intov the bore in said shaft for delivery! to said raceway, an oil-reservoir, means for feedingjoil from said reservoir into said stream of air,and means for regulating the quantity of oil fed into the air stream.

6. A sewing machine having, in combination,

a rotary shaft provided with a longitudinal bore, a rotary hook carried by said shaft and having a raceway, said hook being provided with a plurality of conduits connecting the bore in said shaft `to said raceway at a plurality of points spaced from each other circumferentially of the hook, a thread-carrier journaled in said raceway, and means for directing a stream of air under pressure intothe bore of Asaid shaft for delivery through said conduits to said raceway.`VV

' SYDNEY vZONIS. Y REFERENCES CITED y The following references Yare ofvrecord inthe le ofthis patent: Y

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