Патент USA US2128573код для вставки
Aug. 30, 1938. _ w, MYERs _ 2,128,573 LUBRICA'I'ING MEANS FOR .SEWING MACHINE LOOP-TAKERS " Filed NQV. 12, 1937 % .l‘I A. / “Nag .4%,". E1 lFl ' 2,128,573 v Patented Aug. 30, 1-938‘ _ _ ' UNITED sTArEs ‘PATENT OFFICIE. _ 2,128,513 LUBRIOATING Means ron sawmc‘ mom Loor-rAKEas Walter Myers, Bridgeport, Conn., assignor to The ' Singer Manufacturing Company, Elizabeth, N. J.,- a corporation of New Jersey Application November 12, 1937, Serial No. 174,137 ‘ 12 Claimsf, (01. 112-256) This invention relates to _'improvements in '_ means for lubricating the thread-case raceway of sewing machine loop-takers and more partic V horizontal aperture 18 of a bearing-bushing l9, secured by a screw 20 for endwise adjustment in an aperture 2 I, provided in a casing or supporting block 22 depending from the bed-plate l. ‘The loop-taker hubv ll abuts one end of the a the horizontal-axis rotary hooktype. bearing-bushing l9 and extends‘through a clear - The present invention has for its primary ob jects to provide simple and-eilicient means for ance-aperture 23 ‘of a guard-plate“ having an annular ?ange 25 secured by screws 26 to the supplying lubricant to thread-case raceways of rotary loop-takers‘and to bearings of the loop_-' end-face of the supporting block 22, 'a sealing gasket 21 being preferably interposed between the taker actuating shafts: Other objects of the in vention'will be. apparent from the following de; ?ange 25 and the block 22. The ?anged guard _ ularly the thread-case raceway of loop-takers of 5 ' ' 10 - scription and claims. ' :- ' plate 24 provides a cavity 28 collecting oil seeping v The invention consists in the lubricating means from the adjacent end of the shaft-bearing aper ferred embodiment of the ‘invention, and in taker hub ll. 'I’he‘oil-collecting cavity 28 is con ture i8 of the bearing-bushing i 9, which oil is_ ~ hereinafter described in connection with the ac " 15 companying drawing which illustrates a -pre- _ centrifugally thrown o? by the end of the loop stantly drained through a groove 29 in the outer . Fig; 1 represents a vertical section of a portion ' face of and extending lengthwise of the bushing it from the bottom of said cavity 28. i of the bed-plate of a sewing machine containing ‘which: - '20 the improvement, the needle and the lower por tion of the needle-bar beinglshown in elevation. Fig. -2 represents a cross-section on substantially the line 2--2 of Fig‘. 1. . , The sewing machine illustrated in the drawing has a work-supporting bed-plate I provided with a throat-plate 2 having the usual aperture 3 for the vertically reciprocatory needle 6 carried by the needle-bar 5. 1 Cooperating with the ‘needle 4, ‘below the The casing or supporting block 22 is provided ‘-‘ with a downwardly open cavity 30, closed by a plate 38 removably secured to the bottom of said block by screws 32, a gasket 33 being preferably: employed to seai the joint. One end of the bear ing~bushing l9 extends into the cavity 30, and 25 the end of the loop-taker shaft l6 within said cavity carries a1 driven spur-gear 34 which bears against said end of the bushing. Meshing with the spur-gear 34 is a driving spur-gear 35 secured 30 throat-plate 2, in the formation of lock-stitches. ‘ by a screw 36 upon one end of .a loop-taker actu ating shaft 31. The shaft 31 is journaled in a is a rotary loop-taker 6 which, in the present in stance, is of the horizontal-axis rotary-hook type bearing-bushing 38 secured by a screw-39 for end wise adjustment in a horizontal aperture til, pro and performs two rotations for each reciproca vided in the wall of the block 22 at the side of the tion of the needle. The loop-taker 6 has a cup shaped body internally provided with an annular raceway l. Journal'ed in the raceway l is the pe ripheral bearing rib B of a thread-case 9', said thread-case being restrained against rotation _with the loop-taker by a stationary stop-?nger '40 l0. ' ‘ The loop-taker 6 has a hub ll‘ of which the axial aperture is closed at the inner face of the loop-taker body by a plate l2. The loop-taker body has a radially extending duct l3 connected at-its outer end with a transverse, wick-\?lled duct It opening into the raceway ‘I. The duct 13 is illustrated, in the drawing also ‘as wick-?lled, cavity 30 opposite to the wall which supports the bushing Hi. In the present case, the spur-gears are proportioned so thatthe loop-taker shaft ro tates twice for each rotation of the shaft 31, the latter performing one rotation for each complete reciprocation of the needle and being actuated in ‘ 40 any usual or suitable manner. It will be understood from the foregoing de scription that the gears 34 and 35 are housed in the cavity 30 of the block 22. ,The cavity 30 also serves as a lubricant chamber, the lubricant be ing supplied thereto through an ‘aperture M in the bed-plate I and opening into said cavity, said aperture lil being normally closed by a screw but this wicking may be omitted. The hub H of the loop-taker t is secured by'a '. vplug 42. The depth of the lubricant in the cavity screw l5 upon one end of a horizontally disposed 30 is, preferably limited by providing a side wall loop-taker shaft IS, the end of saidshaft within of said cavity with an aperture 43 normally closed the hub It being preferably spaced from the plate by a screw-plug 44, said aperture 43 being so lo l2 to provide therebetween an annular recess ll’ cated that the teeth of the driving spur-gear) 35 dip into the lubricant. ’ in which the inner end of the radial duct l3 ter The loop-taker shaft It has a longitudinal bore 55 minates. The shaft l3 isrotatably journaled in a ~ 2 araawa 65 extending throughout the length of the shaft, the end'of said shaft carrying the loop-taker be ing counter-bored to provide an annular shaft recess 66 adjacent to and opening into the loop taker recess ll. Suspended lengthwise in the shaft-bore 45 so as to be spaced from the shaft I6 is a stationary oil-conduit in the form of a tube 47, of which one end terminates in the loop-taker recess I‘! and the other end is suitably secured in a 10’ horizontal aperture 68 provided in a supporting plug 49. The plug 49 is adjustably secured by a screw 50 in an aperture 5| of the block 22, in alinement with the bearing-bushing aperture 2| of said block, said plug extending into the block 15 cavity 30 and having its inner end closely adjacent to the spur-gear 3% as well as spaced from the up per wall of said cavity 30. The described inner end of the supporting-plug ‘i9 is provided with a The actuating shaft bushing 38 is likewise pro vided with an oil-collecting duct 55 which opens into a groove 56 in and extending lengthwise 0f the shaft-bearing face of said bushing 38, said groove preferably terminating short of the op posite ends of the bushing. It will therefore be understood that the bearings for the shafts l6 and 31, carried by the block 22 are automatically lubri cated upon operation of the machine. Having thus set forth the nature of the inven 10 tion, what I claim herein is:1. In a ‘sewing machine, a rotary loop-taker body having a thread-carrier raceway and pro vided with a recess having lubricant-conducting connections with said raceway, a stationary lubricant-conduit terminating in said recess sub stantially axially of I said loophtaker body, and ‘ the cavity 30 and its lower end connected with the means for supplying lubricant to said conduit. 2. In a sewing machine, a rotary loop-taker body having a thread-carrier raceway and pro 20 vided centrally of said body with a recess having tube 47. lubricant-conducting connections with said 'race substantially vertical oil-collecting pocket 52, said 20 pocket having its open upper end exposed within . During the operation of the machine, the ro tating gears 34, 35 serve as lubricant-impelling 25 means, and splash the lubricant against the upper wall of the cavity 30, a portion of said lubricant way, a stationary lubricant-conduit coaxial with said body and terminating in said recess, and means for supplying lubricant to said conduit. 25 3. In a sewing machine, a rotary loop-taker having a thread-carrier raceway, ‘a rotary shaft carrying said loop-taker and provided with a lon taker recess IT for supplying lubricant to the gitudinal bore having lubricant-conducting con nections with said raceway, a stationary tubular 30 30 connected wick-?lled ducts Hi, It of the loop taker. Excess lubricant delivered by the tube M conduit extending lengthwise of said shaft bore within and in spaced relation to said shaft, and will‘ drain back through the shaft-bore 65, out side the tube 61, and into the block-cavity 30._ 1 As ' means effective during the operation of the ma chine for supplying lubricant to said conduit. the loop-taker recess ll is slightly larger in diam 4. In a sewing machine, a rotary loop-taker 35 eter than the shaft-recess t6, and as the shaft recess 66 is itself slightly larger diametrically than body having a thread-carrier raceway and radial ly-extending means for conducting lubricant to the shaft-bore ?5,/a small quantity of lubricant re mains in said recesses even after the machine is said raceway, a rotary loop-taker shaft having stopped. This has the advantage that lubricant a longitudinal bore, a stationary lubricant-com 40 is immediately supplied to the radial bore I3 of the duit disposed within the bore of said shaft and loop-taker upon starting the machine. The radial having one end terminating adjacent to said bore i3 is so located in the loop-taker body that radially-extending means, and means e?ective, ' said bore is disposed above the loop-taker recess during the operation of the machine for supplying I‘! in the usual stopping position of the machine lubricant to said conduit.‘ , being collected by the pocket 52 and being de livered by the stationary tube 151 into the ‘loop 45 with the needle in raised position, so that no 5. In a_ sewing machine, a rotary loop-taker lubricant is supplied to said radial bore when the machine is idle. Inasmuch as oil is splashed against the top wall of the cavity 30 at even moderate speeds of op eration of the machine, oil is collected in the pocket 52 at any speeds actually requiring lubrica tion of the loop-taker raceway. The oil is de-v livered without pressure by the tube M to the loop-taker recess I1 and, while it will therefore be 55 understood that the supply ‘is substantially con stant, the quantity of oil conducted to the raceway ‘I varies with the centrifugal oil-feeding action through the radial bore I3 of the loop-taker at different speeds of operation of the machine. 60 This action is permitted because of the fact that body having a thread-carrier raceway and lubri cant-conducting means connected with said race way, a rotary shaft carrying said loop-taker body and provided with a longitudinal bore, a station ary conduit disposed lengthwise in the bore of 50 said shaft, said conduit having one end terminat ing adjacent to said lubricant-conducting means of the loop-taker body, and means effective dur an excess of oil is delivered by the tube 41, as already described. ' - The end-portion of the bearing-bushing I! which extends into the cavity 30 is provided with an oil-duct 53 having its open outer end directed toward the upper wall of the cavity 30 and its inner end terminating in a groove 54 in and ex tending lengthwise of the shaft-bearing face of the bushing 19, said groove preferably terminat 70 ing short of the opposite ends of the bushing. As previously explained, any oil which may seep from the bushing at the loop-taker end of the shaft I6 is collected in the cavity 28 and is re turned through the drainage groove 29- to the 75 block-cavity 30. I ' ing the operation of the machine for supplying lubricant to said conduit. 6. In a sewing machine, a rotary loop_taker_ body having‘ a thread-carrier raceway, a station ary lubricant-conduit coaxial with said raceway and extending into said body, means effective during the operation of the machine for supplying (30 lubricant to said conduit, and means for direct ing to said raceway lubricant delivered by said conduit within said body. , '1. In a sewing machine, a rotary shaft, a loop taker carried by one end of said shaft and having a thread-carrier raceway, said shaft having a longitudinal bore extending from the end of said shaft opposite to the loopltaker end thereof and having lubricant-conducting connections with said raceway, a stationary tubular conduit extend 0. ing into the bore of and spaced from said shaft, a condui?supporting member having a- lubricant collecting pocket open to saidconduit, and means effective during the operation of the machine for supplying lubricant to said pocket. 75 ‘ 3 2,128,573 8. In a sewing machine, a rotary loop-taker body having a thread-carrier raceway and pro vided centrally of said body with a recess having lubricant-conducting connections with said race , way, a rotary shaft carrying said loop-taker and _ having a longitudinal bore, a stationary lubricant conduit extending lengthwise through said shaft bore and having one end terminating in said re cess, a member supporting the other end of said 10 conduit and provided with a lubricant-collecting pocket open to said conduit, and means effective during the operation of the machine for supply ing lubricant to said pocket. 9. In a sewing machine, a rotary loop-taker 15 body having a thread-carrier raceway and pro vided with a recess having lubricant-conducting connections with said raceway, a casing having a. lubricant-supply chamber, means e?ective during the operation of the machine for delivering lubri cant to said recess from said chamber, and means for draining into said chamber excess lubricant delivered to said recess. _ ‘ 10. In a sewing machine, a rotary loop-taker body having a thread-carrier raceway and pro vided with a recess having lubricant-conducting vconnections with said raceway, a rotary loop taker carrying shaft having a longitudinal bore terminating at one end in said recess, a stationary lubricant-conduit disposed lengthwise within said shaft to provide a recess-draining channel in the bore of said shaft exteriorly of said conduit, said conduit having one end terminating in said recess, and means connected to the other end of said conduit for supplying lubricant thereto. , ' 11, In a sewing machine, a rotary shaft having a longitudinal bore, a centrally recessed-3100p taker body secured upon one end of said shaft and provided with a thread-case raceway having lubric ant-conducting connections with the central recess of said body,- said shaft-bore having a _ counter-bore connection with said recess, a lubri cant-conduit disposed in the bore of said shaft 10 and having one end terminating in said recess, and means connected to the other end of said conduit for supplying lubricant thereto. 12. A sewing machine having a cloth-plate, a supporting block depending from said cloth-plate 15 and provided with- a lubricant-supply chamber, _ lubricant-impelling means within said chamber, a horizontally apertured bearing-bushing secured in said supporting block and having a lubricant collecting ‘duct within said chamber, a. rotary 20 shaft journaled in said bearing-bushing,'a.loop taker secured upon one end of said shaft and hav ing a thread-case raceway, a lubricant-collecting pocket within said chamber, means for directing lubricant collected by said pocket to said race 25 way, means for directing lubricant collected by said duct lengthwise of the shaft-bearing face of said bushing, a guard-plate providing an oil-col lecting cavity at the loop-taker end of said bush ing, and means for draining lubricant from said 30 guard-plate cavity into said chamber. ' ‘WALTER MYERS.