US2386349A - Sewing machine - Google Patents

Description

FIGJIQK Oct. 9, 1945'. n

G. sAUER SEWING MACHINE,

Filed Nov. 9,'. 1942 Sheets-Shet 2 oct.' 9, 1945.

Filed Nov. 9, 1942 ca.y sAuER SEWING MACHINE 6 sheets-sheet s' f liI Il k=== Fmg l nngmnf mum-m imm I {lllll 1 Iil IN VEN TOR. GEORGE 654051? ATTORNEY f G. sAUER 9 SEWING MACHNE.

- Oct. 9, 1945.

6 Sheets-Sheet 4 Filed NOV. 9, 1942 i L IHWWWIWHN llu| mm, v w nl a o ,11. m, h R QQN I n m2 Oct. 9,1945. G. SAUER I SEWING MACHINE l ed Nov. 9, 1942 6 Sheets-Sheet 5 Patented @et 9, y1945 meer@ iiNlrED STATES .PATENT'oFFlcl-z l aaaasie' l n SEWING MACHINE George Sauer, Chicago, Ill., assigner to Union Special Machine Com poration of Illinois pany, Chicago, Ill., a co1'- Application4 November 9, 1942, SerialNo, 464,954

c claims. (ci. i12-256) This invention relates to sewing machines of the lockstitch type and moreparticularly to prov visions for lubricating the raceway of a vertical asis hook. or a plurality of such hooks,.and for lubricating and supporting associated devices.

K A primary object of the invention has been to provide a particularly simple construction of the character indicated which is readily accessible for inspection, filling and repair, is adapted to supply the lubricant to the raceway at a substantially uniform rate regardless of the amount of oil available in a reservoir, forming part of the system, is readily regulatable as to rate of oil flow, and has various other advantages, to be hereinafter pointed out. y

More specically,'an object of the invention has been to provide a relatively large reservoir for oil intended expressly for the lubrication of the raceway and other surfaces'associated with a vertical axis rotary hook, the construction and arrangement being such that the rateof ow of the oil to the raceway is affected to a minimum extent by variations in head resulting from theA constantly,d changing amount of oil in the reservoir. This has been accomplished by locating the reservoirgat a point remote from thehook and at an elevation substantially above that of ple means for enabling adjustment of the hook or hooks transversely of the direction of feed. The lubricant conducting connections from the reservoir to the hook raceways are such as to enable this adjustment. They are suchl furthermore, as to avoid' all danger of leakage of the lubricant resulting from relative adjustment of the parts.

There are numerous special features of the construction which tend toward simplicity in the lubricant to various other surfaces on the hook assembly requiring lubrication, as, for ex'- `ample, to the` bearings for the hook shaft and to the raceway and other surfaces to be lubricated.

Another specific object has been to provide, in a lubrication system of the character indicated, simple, eilective and readily accessible reg-f ulating means for controlling the amount of lubricant to be delivered to the hook raceway, depending upon the requirements of a particular machine. This regulating means is such, morecertain escapement devices. f

Another special feature is a particularly advantageous arrangement of the escapement mechanism associated with each rotary hook; This is disposed in an enclosed chamber in the-bottom of the hook saddle or frame, thereby enabling the retention of a quantity l,of the lubricant about over, that the supply of oil to each of a plurality` l of hooks from a single reservoirmay be eil'ectively controlled;

A further specific object has been to provide, in combination with the individual flow regulating means for a plurality of hooks, a main flow control means which is conveniently located and may ,be readily andv quickly operated to Irender the lubrication system eilective orineilective at will. i Still another -object'has been to 'so construct and arrange the connections between the reservoir and the hook raceways as to prevent, or reduce to a minimum, the danger of trapping air bubbles and thus interfering with the operation of the system. TowardA this end a portion of the duct system leading downwardly from the reservoir has been disposed substantially vertically so some of the moving parts of' the mechanism, the

, latter being conveniently operated by connections from the lower lend of the hook shaft. The arrangement is such, moreover, as to facilitate removal and replacement of certain exposed parts\ of the escapement mechanism and to permitiadjustnient or replacement of such parts without completely dismantling the escapement mechanism or removing the enclosure for the othe parts of the mechanism.

Other Nobjects, `features and -advantages ofy the invention will appear from the detailed description -of an illustrative form of the same fwhich'will nowbe given in conjunction with the that anytrapped air` will rise freely and escape into the reservoir. a

A still further object has been to provide simaccompanying drawings; -folining part 0f the speciiicatiomin which:

Fig. I i's a view partly in side elevation and partly in vertical section through a machine embodying theinvention, a portion of the overhanging arm of the machine being shown in broken lines to avoid unnecessary details.'

Fig. II is a somewhat enlarged view, in plan, oi the work supporting portion of the machine with certain cover plates removed to show the hook units beneath.

Fig. III is a bottom plan view of the machine with a cover plate at the base of the standard removed to disclose certain parts 'enclosed theref by.

Fig. IV is a transverse, vertical section along the line IV-IV of Fig. I.

Fig. V is a--plan view, along the line V-V ofA Fig. I, showing a portion of the,top of the machine. p

Fig. VI is an enlarged sectional view along the line VI--VI of Fig. IV.

Fig. VII is a transverse, vertical section through the base of the machine, along the line VII-VII of Fig. II.

Fig. VIII is a vertical section through one of the hook units as viewed along the line VIII- system.

Fig. XII is a vertical section along the broken line XII-XII 0f Fig'. XI,

Fig. XIII is a bottom view of one `of the hook frames with its `bottom plate removed, as indicated by-the line `XIII-X111 of Fig. VIII, and Fig. XLVis a top plan view of said hook frame with a portion of the frame broken away for' purposes of better illustration.

'I'he invention has been` illustrated herein as applied to a lockstitch sewing machine of the type disclosed in the pending application of Oscar Quist, Ser. No. 326,828, led March 30, 1940, and now matured 'into Patent No. 2,329,484,`dated September 14, 1943. It will be understood, however, that the invention is intended for, or susceptible of, application to other types ofvvertical axis rotary hook machines having any desired number of needles `and rotary hooks and having other forms of work feeding mechanism and the like. Y

Referringnow to the drawings, the machine may suitably be provided with a frame having a base portion I0, the upper surface of which constitutes a work support.; At one end of the base there is providedan upwardlyextending hollow standard Il at the upper end of which is carried a laterally projecting hollow arm I 2 which extends over the work support and' terminates in a needle head portion I3. Journaled in suitciprocated in a "substantially vertical direction, upon each revolution of the shaft I4, but is also oscillated to swing its lower end in the direction of feed. This swinging movement' may be of 'any selected, variable magnitude and is for the purpose of assisting inthe feeding of the work. However, the needle feed action may be eliminated, if desired. Also mounted in the needle head is a spring-urged presser bar I8 carrying a presser foot I9, of any suitable construction, at its lower end. Any convenient means may be employed for urging the presser bar downwardly, to retain the presser foot yieldingly in engagement with the work, and for disabling the presser ber 23 having an arm connected by a link 24` with an arm 25 secured to arock shaft'26 which extends lengthwise of the base I0 and is journaled in suitable bearings provided thereon. A feed rocker arm- 21 (Fig. III), ,secured to the shaft 26, carries at its upper end a feed bar 28 having mounted thereon the feed d og 20. This mechanism for imparting the feed and return movements to the feed dog may suitably be interconnected, by means of the rock member 23, with the devices for imparting the feed movement to the needles I1, as more fully explained in the above-mentioned Quist application. The length of thefeed stroke of both the needles and the feed dog may be varied by adjustment of the.

bar 23 through rotation of a, thumb screw 30. Lifting and lowering of 4the vfeed dog may be accomplished through other connections,V with the shaft I4, including a gear 3|, secured to the shaft and arranged to drive a,transmittinggear -32 mounted on a horizontally disposed shaft 33 in the standard II,. which is in turn adapted to drivea gear 34 secured to a shaft 35. The latter is mounted for rotation ,in suitab-le bearings in `an eccentric secured the base-of the machine. Gears 3l and 34 are of identical constructionso that ftheshaft .35 will be givenone revolution for each revolution of the shaft I4. Suitable connections, including to Ythe shaft 35 and cooperating with a strap member 36 pivotally connected with a. downwardly extending arm'31 of the feed bar, serves to impart the lifting and lowering able bearings, provided in the upper portion of the standard I I and in the overhanging arm I2, is

a main drive shaft I4 having at its outer end, beyond the outer wall of the standard, a combined hand wheel and pulley I5` by .means of which power is supplied to the machine.

Suitable connections are provided from the shaft Il for operatinga needlebar I6 appropri- The.

movements to the feed dog, all as more fully set forth in said Quist application.

The shaft 35 also serves to operate the rotary l hooks which are designated generally at 38 and 39 in Fig. II. For this purpose there is secured to the shaft 35 at. the appropriate points a pair of spiral gears 4U (Figs. I and III) adapted to mesh with spiral pinions 4I secured to shafts 42,

which shafts support and drive, and form integral lparts of, the rotary. components of the hooks.

Therelation between 4the gears 40 and pinions -l is such that the hook shafts will be giventwo revolutions for each revolution of .the shaft 35.

`For this purpose onel the under surface of the main body 56 of the y rotary component of the hook. A needle guard gated slot 44 adapted -to receive a screw 45- threaded into av lug 46 extending downwardly from the work supporting portion of the base. The opposite end of the saddle is forked, as indicated at 41 (Fig. VII). vand is adapted to be clamped, by means of a screw 48, about a bear-'- ing sleeve 49 (Fig. III) in which the shaft 35 is journaled.` By loosening the screws 45 and 48,

the' hook frame may be shifted longitudinally of the basegi. e., transverse to the line of feed of thework. This permits avariation in the spacing of the needles in a multiple needle machine and permits adjustment of the rotary hook with respect to its cooperating needle in either a sin- 'gle orwmultiple hook machine. When the hook frame is adjusted in the manner indicated, the

associated driving gear 40 will also need to be adjusted and for this purpose it is simply necessary to loosen a set-screw 50 which secures the driving gear to the shaft 35.

The hook shaft 42 is journaled at its lower end in a 'bushing 5I, carried by a portion 52 of the frame, and it is journaled at its upper end in "a bearing 53, mounted in `a. portion 54 of the frame The driving pinion 4I secured to the hook shaft isdisposed between the two portions 52 and 54 of the frame and is fitted snugly between -the two bearing sleeves 5l and l53 which take the end thrusts of the shaft.' At its upper end the shaft 42 is flared outwardly to provide a frusta-conical section 55 which extends into the mainy body 56 of the rotating component of the hook. The shaft 42, section 55, and main g body 56 are preferably formed as an integral unit, although they may be formed in two `or more separate parts, if desired. Within the usual cavity inrthe .top of the hook body there is disv (Figs. II, VII and VIII) may be secured to the` hook by a plate portion inserted between the plate 68 and the main body 56. I'I'he inner, annular surface 1| of the'plate 68 is of frustolconical form, confonnmg with that of the secun 55-of the hook but spaced slightly therefrom, so

as to provide a small annular channel, for the passage of the lubricant, in continuation of that formed at ,the upper end of the sleeve 53. The downwardly projecting portion 61 is formed, also,

- .with anouter'frusto-conical surface 1'2, inclined in the opposite ,direction from the surface ll. Surface 12 is spaced slightly from a corresponding frusto-conical surface 13 formed at the inner edge ofthe enlarged portion of .the opening 66 in the plate 65, and serves to sling or impel downposed a stationary bobbin carrier 51 which is held ,against rotation with the rotary component, by appropriate means of well known construction. The bobbin carrier is provided with an interrupted rib 58 adapted to cooperate with a raceway 59 formed in the wall o f the rotary i component 56. It isthe lubrication of this raceway which constitutes an important purpose of the present invention. f

Referring now to Figs. VII to X, inclusive,

- means, to be hereinafter described, are provided -wardly, during rotation of the hook, any oil which reaches thev surface 12. Dne or more small outlet ports 14 extending through the bottom of the main body 56 of the hook serve to deliver oil from the channel between the surfaces and 1| to the interior of the hook body.

It will be apparent that oil delivered to the'A I recess 6I and through the passage 63 to the surface' 55 will, upon rotation of the rotary com-- I ponent of the hook, be distributed upwardly and outwardly along this surface by centrifugal aetion and will be forced through the passage 14 to the interior of the `rotary component and thence to thevraceway 59. Any oil whichl tends formed in the inner surface of the bushing 53v permits some of the lubricant to pass downwardly along the outer surface of the shaft to lubricate the upper bearing and the teeth of the driving gears. this lubricant will be forced upwardly by the viscous pump action of the spiral'groove so as to prevent objectional leakage of the lubricant from vthe base of the bushing.

Each hook unitl is provided'with an escapement mechanism adapted to function in a well known manner. This mechanism may comprise a finger .16 (Fig. II) oscillated upon each cycle with a recess 6l at one side of the hook bracket or frame 43. A passage 63 in the frame places the recess 6I 'in communication with a notch 64 in the upper end of the bearing sleeve 53.` On its inner. surface, the upper end of this bearing sleeve is flared outwardly to conform with the frustoconical section 55 of the hook shaft but it is spaced slightly yfrom the latter to provide an annular channelv for the flow of the lubricant along the surface of this frusto-conical section. At the top ofthe main body of the hook frame, there is'secured a plate 65 which closes theK top ofla portion of the passagev63. This plate is provided .with an annular opening 66' surrounding the upper end of the bushing 53. Above the end of tion of the frusto-conical section 55. Into this,

pocket extends a downwardly vprojecting portion,

61 of an annular plate 68 secured by screws 68 to of operation of the machine to carry it's end into engagement with a projection 11 on the bobbin carrier for-the purpose of turning the latter slightly against the frictional drag of the rotary hook. This is to permitthe thread loop to bev released from the usual projection on the stationary component of the hook which normally holds the latter against rotation. Finger 16 is adjustably lcarried by an arm 18 by means of an elongatedslotlil in the finger and a retaining screw lll).v The arm 18 is secured by means of al clamping screw 8l to the upper end of a rock shaft or pin 82. Thelatter is vertically disposed (Fig. IX) in a hole 8 3 which extends vertically through the hook saddle and forms a bearing'for the rock shaft. Atthe lower end of the rock shaft there is secured a two-armed member 84, of bellcrank shape,v having pivotally attached thereto, at its elbow, one end of a pitman whose opposite end is .apertured to form a strap cooperating withan eccentrie provided at the lower end of the hook shaft 42. The arm 81 of thememb'er However, during rotation of the shaft,v

84 extends beneath the pitman 88 and serves to retain the latter in proper engagement with the eccentric 86. In the assembly of these parts, after the pitman 85 has been applied to the* eccentric, the member 84 is raised with the rock shaft 82 l tothe proper position, at the same time engaging the bearing aperture in the arm 84 with the pivot pin 88, which has a tight t in the pitman. Arm 18 is then pressed downwardly over the shaft82 until the bottom ofits forked end engages the top plate 65 of the hook unit and it is there clamped in position. During this adjustment of the arm 18 the shaft 82 is held raised in its proper i position by means of pliers which may conveniently be engaged with a tongue 89 extending upwardly from the end of the shaft.82 above the surface of the arm 18. As best shownvin Figs. VII, VIII andl IX, the

escapement operating members 84 and 85 are disf posed in an L-shaped chamber or recess 90 provided inthe bottom of the frame 43, this chamber being closed byv a plate 9| and a gasket 9 2 'secured by screws 93 to the bottom of the frame.

A passage 63a (Fig. XIV) vformed through a portion of the frame communicates at one end with cant continuously, as required, tothe `tting 68 of each hook unit of the machine. Referring .to Figs. I, I V and VI, there is provided at the topof the vertical standard a relatively largelubricant reservoir 94. This may suitably be formed of sheet metal, or an appropriate plastic or the like, and provided with a flange 95 adaptedto be clamped between a fiat surface 96 provided at the top of the standard. I I and the under surface of a cap or closure` member 91 which is secured by screws 98 to the top of the standard. Suitable gaskets 9 9 may be provided above and below the flange to insure a tight seal. In order'to provide maximum lubricant capacity at a substantial elevatio'n above the work support, the reservoir may, in transverse cross section, have an L-shaped configuration, as illustrated in Fig. IV. -The reserl voir may be filled with the desired lubricant through an opening |88 in the closure member the oil passage 63 and at its opposite end with the l interior of the hole 83. In this way, a portion of the oil delivered through the fitting 68 is suppliedto the bearingfor the rock shaft 82.` This oil, descending along the rock shaft, enters and may eventually fill the chamber 98 at the base of the hook frame-or, if this is otherwise lled, it

will be kept constantly replenished. Thus, all of the relatively moving parts `of the escapement mechanism will be thoroughly lubricated. Moreover, some of the oil from the chamber 98 will .work upwardly into the bearing 5| and thus 98 and serving in part to lubricate the escape.

ment 'mechanism and the lower bearing for the hook shaft. f

By reference to Figs. VIII and XIII, it will be noted that the construction and arrangement of the escapement mechanism and other parts associated with the hook shaft is such that the latter may be readily removedand re-inserted through the top of the hook frame without removing the plate 9| which closes the recess.98. To remove the shaft, it is simply necessary to loosen the setscrew which retains the pinion 4| 'and thefshaft may then be lifted out. The connection between 91, this opening being normally closed by Va spring cap. A gauge of any suitable type is preferably provided to indicate readily and at all times the extent to which the reservoir is filled. A plug |8|, formed of Lucite or similar material, extending through the closure member 91 and having its lower. end of tapered or wedge-shaped construction may advantageously be employed for this purpose. The construction and operation of such a gauge is more fully' disclosed and is claimed in my application Ser. No. 337,499, filed on May 27, 1940, and issued as Patent No. 2,301,460 onl November 10, 1942.

The lubricant may be discharged from the reservoir 9| through an apertured fitting |82, preferably extending through the'bottom of the reservoir at its lowest point. Thisfitting, which constitutes a valved outlet port, has a screw-.threaded neck |83' extending through an opening in the reservoir bottom and is clamped in place by a nut |84. 'A gasket |85 between the underside of the reservoirand a shoulder on the fitting serves to preventleakage of the .oil around the tting; At

its lower end the member |82 is connected with a tube or conduit |88 formed of any suitable malterial, such as brass or a plastic composition or the like, this conduit being attached to the fitting by means of a suitable'coupiing |81. Fora considerable distance downwardly from the reservoir the conduit |86 is disposed in a substantially vertical position and is free from sharp bends. This insures the ready escape of any air bubbles which may become trapped .in the conduit. Such air the eccentric 86 and the strap portion of' the fpitman 85 permits ready disengagement and reeng'agement, for this purpose. Furthermore, the lower end. of the eccentric 89 is tapered slightly or beveled, as shown in Figs. VIIand VIII. to facilitate its introduction into the opening in the pitman 85; As `will be Iseen in Fig. XIII, the recess 98 is of such narrow dimension that the pitman 85, when disconnected from the eccentric, cannot be displaced very farfrom its normal path of movement, so that the beveled end ofthe eccentric 'may always be readilyinserted in the strap opening. Moreover, the relation between ,the opening 66, in the plate 85, and the portion 81,

of plate 88, is such as to permit the indicated l bubbles will rise lfreely through the vertical tubing and be released into thereservoir. At its lower end the conduit has a portion |88 which is curved over a sweeping arc and carries at its terminal a coupling |89 adapted `to receive the Ascrew-- threaded end of a tube ||8 which passes through a vertical wall forming a downward extension of the inner wall of the standard Tube H8 forms part of a manifold member ||2 which, as best shown in Figs. XI a'nd XII, is provided with a passage ||3 adapted to deliver the lubricant into a cross channel 4. This, to facilitate manufacture, is closed at one end by av removable screw plug ||5. Small ports ||6 extend downwardly from the cross channel H4 and communicate with separate vchannels Informed in" related channel H1, a suitable valve is provided.` Each of these valves comprises an adjustable screw-threaded plug H8 having a conical .point ||8 at its inner end adapted to close the port with the channels ||1 H6 to any'desired extent. The plug may be retained in any desired position by means of a lock nut |20.' In each of the extensions provided there is inserted a nipple |2| adapted, to be connected by a coupling |22 with a conduit |23. The conduits |23 are connected with the respective fittings 60, above'described,` associated with the two hook frames.

Each of the-conduits |23 is provided with a large gthrough the closure member 91 and is provided at its upper end with a suitable knob |21. A spring |20, acting between the under surface of the closure 91 and a, washer |29 carried by the valve stem, urges the latter downwardly.` A pin |30 extending through the valve stem, adjacent its lower .end cooperates with the upper end of the fitting |02 and may either engage the main flat portionof the top of this member or may register with a pair vof V-notches |3| formed in the rim of the member. When the valve lstem is in the position indicated in Fig. VI, in which the pin |30 registers with the notches |3I, the valve |25 is seated and the ow of lubricant into the conduit |06'is cut olf. However,` if the valve stem is rotated through 'a small angle, it will be cammed upwardly,as a result of the pin |30 riding up the sides of the lV-notches and onto the nat portion of the top of member |02, thereby opening the valve and permitting the flow of lu-v bricant into the conduit |06. The knob|21 may suitably be formed with a rib |32 or some other indicating meansV to showwhether the valve is closed or open.

The lower end of the standard (Fig. I) is preferably closed by a bottom plate |33 and a gasket |34 to provide a lubricant chamber serving as a, reservoir for a suitable lubricant for the various bearing surfaces within the standard and. if desired, in other parts of the machine also. The gear 34, secured to the shaft 35, may be arranged to dipinto the lubricant in this chamber and disperse it throughout the standard. The lubricant may also be dispersed to a certain extent by the rocking ofthe arm 25. A gauge |35, having its upper end flush with thetop of the work supporting surface, adjacent the standard, and which may suitably be of the type disclosed in the above-mentioned Sauer application, may be provided to show at all times the levelof the lubricant within the chamber.

The operation of 'the machine is believed to be clear from the foregoing. A biefrsum, how` ever, willnow be given. Periodically, say once or several times a day, depending upon the exasaasaa ever the machine is idle, the valve will be closed by positioning the indicator |32 on the knob |21 in the direction shown in Fig. V. When it is desired to start the machine after an idle period, Athe knob |21 is rotated slightly, through about -90, to carry the pin |30 out of the V notches |3| 'and onto the atvupper surface at the top of the fitting |02. This will permit the flow of oil from the reservoir through the conduit |06 tothe manifold ||2. From thetransverse channel I4 of the latter a portion will pass through each of the vertical ports H5. The rate of o'w through these portsshould be suitably regulated, by proper adjustment of the screw plugs H8, so that just the right amount of oil .to supply the lubrication requirements of the vertical hooks will be delivered to the latter. A portion of this lubricant will be passed through the channel 63 and the opening 64 to the frustoyconical surface 55, at the upper end of the hook shaft, and upon rotation of the latter will be forced upwardly and outwardly by centrifugal action and delivered through the passage 14 to the interior of the hook and thence to the raceway. When the rotary hook is stationary, between the formation of successive seams or lines of stitching, the oil will simply accumulate in the small clearance space `around the conical surface 55 and in the small pocket in the top of plate 65. It will be understood that during these brief idle periods of the hooks, the valve |25 will be left open. However, the flow of oil will not be sulcient at these times to cause any substantial loss `of lubricant around the depending portion of the plate 68. The frusto-conical surface 12 of the latter will, during rotation of the hook,

serve tothrow or impel the oil downwardly into kthe small pocket and from the latter intofthe tentof use of the machine, la suitable lubricant, preferably of a light, stainless type, is introduced through the filling opening |00 into the reservoir 94 until the transverse indicating line onr the wall of the standard for this purpose. Whenpassages communicating with the raceway. This not only prevents the escape of the lubricant d uring the periods of operation but also provides space for the subsequent accumulation of oildur-4 ing idle periods. A-part of the voil delivered to the surface 55 will descend through the spiral groove 1-5 into the bearing 53 and provide adein any way, the conduits which quate lubrication of the latter. Some of this oil y will nd its way even to the teeth of the gear 4|. -During rot'ation of the hook shaft, however,

there is a tendency to impel the oil upwardly within the bushing 53, due tothe vsense of the spiral groove 15, so that no appreciable amount of oil will escape from the bushing. Another part i of the oil delivered to the recess 6| in the hook l frame will be diverted through the passage 63a tothe bearing aperture 03 in which the rock shaft 82 is mounted. Thus, this rock shai't` is adequately lubricated and any excess lubricant descending along the shaft is delivered into, thev small L-shapedchamber at the bottom of the hook frame. This oil will serve to lubricate'the operating linkage for the escapement mechanism, including the eccentric 86. oil will 'also und its way into the bearing sleeve 5I to lubricate the lower end of the hook shaft 42.

Sl-ould it be desired-'for anyreason, to adjust the hook units with respect to each other or to the line of, stitching. the'adlustment may be very simply effected by loosening and subsequently tightening the screws 45 and 48, which retain the hook frame, and the set-screws 50, which retain the gears 40 in proper relation on the shaft 35. It is not necessary to disconnect, or-disturb deliver the lubricant tothe hook frames. y

While an illustrativeformrof vthe invention has A portion of this 'been described in considerable detail, it will be i understood that numerous variations may be.

made in the construction and arrangement' of the several parts without departing from the general -principles and scope of the invention. The

terms and expressions used herein have been employed as terms of descriptionA and -not of limitation.

l. A lockstick sewing machine having a base with a work supporting surface,.a standard rising Afrom one end of said base, a rotary hook unit ponent for oscillating said rock-shaft, a lubricant reservoir spaced from said hook unit and disposed above the level thereof, means for delivering lubricant from said reservoir to said hook unit and for directing the lubricant so delivered to said bearings for said shaft, to said raceway and to said rock-shaft and the operating connections therefor.

shaft, bearing means for said shaft, a lubricant i reservoir carried by said standard above said work support, a -conduit extending from said reservoir to said hook for delivering oil to a surface on said rotary component, said surface being so constructed and arranged as to induce a. pumping action upon'the oil to force it into said raceway,

means forming an annular lubricant collecting pocket extending about said surface, and means for delivering lubricant from said pocket in one direction to said raceway and in anotherdirection 'to said bearing means for said shaft.

2. AA lockstitch sewing machine having a base with a. work supporting surface, a standard rising from one end of said base, a, rotary hook unit mounted in said base with 'its axis normal to said work supporting surface, said hook unit having a rotary component and astationary component with a, raceway therebetween,= said rotary component including an axially extending driving shaft, bearing means for said shaft, a lubricantreservoir carried by said standard above said work support, a conduit extending from said reservoir to said hook for delivering'oil to a surface on said rotary component, said surface being so constructed and arranged as to induce a pumping action upon the oil to force it into said raceway, means forming an annular lubricant collecting pocket extending about said surface, and means responsive to the condition of rest or rotation of said rotary component for delivering lubricant from said pocket alternately to ,said raceway and- -to said bearing means for said shaft.`

3. In a lockstitch sewing machine having a base 4frame, a rotary component including a shaft having its axis normal to said work support and a stationary component, upper and lower bearings in said framevfor said shaft, said rotary and sta-V tionary components having a horizontally disposed raceway therebetween, escapement means arranged to engage said stationary component during each cycle of the machine, said escapement means including a rock-shaft journaled in,

said frame, connections from said rotary comwith a. work support, a rotary hook unit having' a 4. In a sewing machine a vertical axis rotary hook, said hook comprising a rotary component including a shaft and a stationary` component having a rib in bearing engagement with a raceway in'said rotary component, a bearing for said shaft, a main lubricant reservoir disposed at a point remote from said rotary hook, and lubricant conducting means for delivering lubricant from said reservoir to a surface at the periphery of said rotary component, the construction and arrangement being such as to provide passages through which the lubricant so delivered to said surface will be discharged therefrom alternately to said raceway upon rotation of said rotary component and tosaid bearing when said component is at rest.

5. In a sewing machine, a vertical axis rotary hook comprising rotary and stationary components, a shaft adapted to support and actuate said rotary component, a. bracket in` which said shaft is journaled, a lubricant-containing recess in the lower end' of said bracket into which said .shaft extends, escapement means cooperating with said stationary component, actuating means for said escapement-means housed in said recess and connected with said shaft, the connection between said shaft and said actuating means comprising an eccentric at the lower end of said shaft wholly 'within the projection of the periphery of said shaft, said actuating means including a part having an axially sliding fit with respect to said eccentric so as to permit removal and replace- .ment of said shaft from above with consequent engagement and disengagement of said connecwith said stationary component, actuating means for saidescapement means housed in said recess and connected with said shaft, the connection between said shaft and said actuating means comprising an eccentric at the lower end of said shaft Wholly within the projection of the periphery of said shaft, said actuating means including a part having an axially sliding t with respect to said eccentric so that engagement and disengagement thereof may be eiected by a simple upward axial sliding movement of said shaft. A l GEORGE SAUER.

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