US2120210A - Sewing machine - Google Patents

Description

June 7, 1938.

A. B. CLAYTON SEWING momma Filed Jan. 22, 1937 a Sheets-Sheetl.

June 7, 1938. w A. B. CLAYTON 2,120,210

' SEWING MACHINE Filed Jan. 22", 1937 s sheets-sheet 2 WWW June 7, 1938.

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swims momma mm Jan. 22, 1931' w a Sheets-Sheet 5 @Qndmw ,B. UZWon Gum June 7 1938. A. 'B. CLAYTON sawme u'cnmn Filed Jan. :22, 1937 a Shqets-SheotB- @Yndrew fl. Clgyion June 7, 1938. A. BVCLAYTOAN snwme momma Filed Jan. 22" 1937 a Sheets-Sheet 7 x CZgyton June 7, 1933. A, B, cLm oN 2,120,210

- spvune momma Filed Jan. '22, 1937 a Sheets-Sheet s Patented June l, 5938 SEWING MACHINE anal-aw 3. Clayton, Union, N. 3., assignor' to The Singer Manufacturing Company, Elizabeth, N. 5., a corporation of New Jersey Application January 22, 193' Serial No. 121,747

15 @laims.

This invention relates to sewing machines, more particularly of the chain-stitch straightaway-feed type, and has for an object to provide an organized sewing machine of the type in guestion having improved characteristics enabling it to be commercially operated at speeds of the order of 6000 stitches per minutawithout undue wear and tear on the parts.

A further object of the invention is to provide lor the simplification and ready access to the parts of the machine, facilitatinglts manufacture, operation and maintenance.

With the above and other objects in view, as will hereinafter appear, the invention comprises parts hereinafter set forth and illustrated in the accompanying drawings 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. 1

Referring. to the drawings, Fig. 1 is a front side elevation of a' sewing machine embodying the invention. Fig. 2 is a detail view, in plan, of a the rotary looper-thread take-up element of the machine. Fig. 3 is a longitudinal vertical section through the machine frame showing the internal mechanism. Fig. 4 is a section on the line i-, Fig. 3.' Fig. 5 is a front end elevation of the machine. Fig. 6 is a section on the line 5-5, Fig. 5. Fig. 7 is a section on the line 'l-l, Fig. 5. Fig. 8 is a vertical axial section through the presser-bar and presser-spring. Fig. 9 is an elevation of the needle-bar guide-pin.

Fig. 10 is a rear end elevation of the machine. Fig. 11 is a rear elevation of the housing for the looper-thread take-up which housing is shown in section in Fig. 16. Fig. 12 is a horizontal section through the machine bed at the level of the main shaft. Fig. 13 is a rear side elevation of the machine. Fig. 14 is a section on line t l-i i, Fig. 3, showing the cloth-plate in plan. Fig. 15 is a section on the line iii-iii, Fig. 3. Fig. 18 is .a view of an element of the lower-actuating mech- J ansm which is partially hidden in Fig. 15. Fig. 17 is a vertical sectional view on the line ili'l, Fig. 12. Fig. 18 is a sectional View on the line lB-i8, Fig. 12, and Fig'lQ isa perspective view of the cloth-plate and hinged guard carried thereby, removed from the machine.

The hollow machine frame, which is preferably cast in one piece, comprises a hollow bed i iromone end of which rises the standard 2 of the overhanging bracket-arm 3 terminating in' the head l. The bed i includes the rectangularthe devices, combinations, and-arrangements of (Ci. lime-197) supporting base 5 which constitutes a closed bottom wall of the bed. The hollow frame casting has at the standard end thereof a'vertical internal partition 6 which extends fromthe bottom wall of the bed i to the top wall of the bracketarm 3 and divides the space within the frame casting into an oil or splash-lubrication compartment l and a belt compartment 8. The bed i has another internal wall or partition 9 which divides the oil-splash compartment 1 from the feed and looper compartment H3. The bracketarm 3 has an internal partition ll which divides the oil-splash compartment from the needle-barrnechanism compartment it within the hollow head 5. The oil-splash compartment 1 extends upwardly from the oil sump i2, Fig. 3, through the standard 2 and laterally intothe bracket-arm 3. This oii-splash compartment is practically oiltight. At. the bottom of the sump i2 there is provided a clean-out opening closed by 'the gasket-fitted cap !3. At the rear of the frame there is provided an access opening into the oil compartment 1 which is closed by the gasket-fitted plate 54. In the top wall of the bracket-arm there is provided an access opening I 5 into the oil compartment I closed by the gasket-fitted cap 95' carrying a'breather or ventilating pipe it, Fig. 4,-which passes through the cap 15' and has its free end down-turned. The cap i5 is held in place by the leaf-spring il'which is pivotally secured to the bracket-arm by the shouldered screw it and may be swung laterally about the screw it to release the cap l5.

Disposed within the bed i is the lower rotary main shaft 49 which extends through the belt compartment 8 and oil compartment '7 and into the feed and looper compartment ill. "The mainshaft is journaled in the conventional closed type ball bearings and 2t fitted into the partitions d and t, respectively. Disposed alongside the bail-bearing 2B is an open type ball-bearing iii to aid in carrying the main-shaft. All of these bearings are exposed to an oil mist or spray produced in the oil-splash compartment.

" Disposed within the bracket-arm 3 is the upper rotary shaft 22 which extends through the belt compartment a and oil compartment 1 and into the hollow head 6. The upper shaft 22 is journaled in the conventional closed type ball hearings 23, 2d which are fitted into the partitions H and h, respectively, and are exposed to the oil mist generated in the oil compartment.

Mounted on: the shafts l9 and 22 within the belt compartment 8 are the belt-sprockets 28 01' equal size which"are connected by the conventional clip belt 28. The outer open face oi the belt compartment 8 is closed by the cover-plate 21 having openings through which the shafts I 9 and 22 project. Mounted on the outwardly projecting end of the main-shaft I9 is the beltpulley and hand wheel 28 by which the machine I is driven.

The needles 29, which reciprocate vertically through the needle-holes 88 in the throat-plate 8|, are carried by the hollow needle-bar 82 Journaled in the bearing bushing 88 in the frame head 4. The upper end of the needle-bar '82 is entered by the guide-pin 84. Figs. 5 and 9, having at its upper end a head 38 which is fixed in the framehead 4 by the screw 38. The guide-pin 94 is formed'with an external longitudinally extending oil-groove 81 to which oil is conducted through .the port 38 from the internal duct 89 extending downwardly from the ,oll- -reservoir 48 in the head 98 which may contain an absorbent plug 4|. The needle-bar 92 has clamped to its upper end a collar 42 carrying a lateral pin 48 which is embraced by the upper end of the link 44. the

' lower end of which embraces the hollow crank-.

pin 48 carried by the crank-head 48 fixed to the .upper shaft 22. The lateral pin 48 carries a oil through a lateral opening which is normally end of the lever 12 in engagement closed by the removable filler-plug screw 88. Any excess of oil within the head 4 will gravitate to the oil-pocket 84 at the bottom-of the head 4 from which it will run through the drainage duct 88 into the bracket-arm 3 and gravitate to the oil-sump l2. To prevent loss of the fillerplug screw '88 within the hollow machine frame when inserting or removing said screw, there is frictionally fitted within the access opening I5 a split cup 58 the bottom 81 of which is apertured at 88 to partially receive the shaft 22 but not touch such shaft; the clearance crack between the apertured cup and shaft beingnarrow enough to retain the screw 83 should it drop within the cup 88. Any oil which may work its way through the ball-bearing 28 will be trapped, within the bearing cap 89 and will run backthrough the drainage duct 88 into the bracketarm 8 and gravitate to the oil-sump I2.

The presser-foot 8i, Figs. 5 and 8, of the machine is carried by the short hollowpresser-bar 82 which is jcurnaled in the bearing sleeve 89 in the head 4 and'is urged downwardly by the coil-spring 84 housed within the guide tube 88 fixed in the head 4. The spring 84 is fitted at its lower end with the tapered plug-head 88 which engages the top end of the hollowpresserbar 82. At its upper end the spring 84 is fitted with the cylindrical plug-head 87 which is engaged by the adjustable thumb-screw 88 by which the working pressure of the spring 84 upon the presser-bar 82 may be regulated. There is clamped to the presser-bar 82 a split-collar 89 having a lateral arm 18 which extends outwardly of the head 4 through the guide-slot H and is engagedby the usual treadleor knee-controlled presser-lifting lever I2, Fig. 13, fulcrumed at I8 on the bracket-arm 3 andubiased by the spring 14 in a direction to yieldingly retain the front with the stoppiu I8.

Cooperating with the needles 29 to form stitches are the thread-carrying loopers I8 which are mounted on the looper-carrier arm 17 having at its lower end a split boss I8 which is clamped to a stud-pin I9 Journaled in the transverse bearing head 88 of the hollow looper-supporting rock-shaft 8|. The rock-shaft 8| is Journaled. below and parallel to the main shaft I9 in a bushing 82 in the frame-partition 9. Within the oil compartment the bushing 82 is formed at its upper side with an oil-catching pocket 88 to lubricate the bearing between the bushing 82 and the rock-shaft 8i. The rockshaft 8| has at the upper side of its inner endportion an oil-catching pocket 84 communicating through the hollow rock-shaft with the bearing between the transverse. bearing head 88 and the stud I9. The rock-shaft 8| has clamped to it within the oil compartment I the split hub 85, Figs. 15 and 16, of a fork 88 which embraces the follower block 81 of the looper side-throw eccentric 88 fixed to the main shaft I9.

The looper-carrier I1, Figs. 1, 5, and 12, is

.end of a crank-arm 92, Fig. 15, clamped at its upper end to the outboard projection of a rockshaft 93, Fig. 14, journaled above and transversely of the main-shaft I9 in bushings 94, 95 in the frame front side wall and the internal bearing block 98 which is detachably mounted on the frame withinthe standard 2.

The rock-shaft 98 has forged integral therewith a laterallyextending crank-arm 91 connected by a ball-and-socket joint 98, Fig. 3, to the upper end of a pitman 99 which at its lower and embraces the eccentric ball or crank I88 in the main-shaft I9. Extending downwardly from the pitman 99 is the oil-splasher or agitator IOI which dips into the oil-sump I2. The oilsplasher II is formed in its front side with an oil pick-up groove I82 which communicates at its upper end with the bearing of the eccentric ball I88. It will be understood that; while the machine is in operation, the looper-operating parts within the oil compartment will be flooded with a mist or spray of oil and effectively lubricated, the spray being confined within the oilpocket I08 at its lower end which is connected by the oil-drainage duct I86 with the oil-sump. Any possible leakage of oil through the ballbearings 2| and 24 is thus taken care of. I

The machine is provided with a four-motion feed-dog I81, Fig. 5, which is mounted on the feed-bar I98 fulcrumed at its rear end on the pin I 89 carried by the forked upper end of the feed-rocker '9, Figs. 12 and 17. The feed-rocker IIO has formed integral therewith at its lower end a tubular boss I I I, Fig. 17, which is journaled to rock upon the stationary bearing pin II2 fixed in splitbushings I I2 in the frame. Clamped upon the tubular boss III of .the feed-rocker H0 is the inclined slotted arm 2' which is engaged by the slide-block H8 journaled on the bushing II4, Fig. '7, carried by the feed-adjusting pin I I 5 which passes through and is clamped to the slotted III arm Iii of the feed-actuating lever H6, H1, fulcrumed on the stud-pin H8 carried by the machine frame. By loosening the clampescrew II9 on the pin II5, the latter may be shifted along the slots in the lever-arms H2, H5 and clamped in any desired position of adjustment upon the lever-arm H6, thereby regulating the length of the feeding stroke imparted to the feed-bar I08. The feed-lever arm HT is forked to embrace the block I on the feed-eccentric IZI on the main shaft I9.

The feed-bar I I38 receives its rising and falling components of motion from the feed-lift eccentric I22 on the main shaft. The eccentric I22 is embraced by the strapped end of a cylindrical pin 323 which slid-ably fits a horizontal bore I24,

Fig. 5, in the feed-bar I68.

It will be observed in Fig. 18, that the fulcrum: pin H8 for the feed-actuating lever II! passes through the partition 9 from the feed and looper compartment ill into the oil-splash compartment '1 and is provided within the latter compartment with an oil-catching pocket I25 communicating through the wick-filled bore I25 and port I27 with the bearing for the lever ill.

The bearing between the feed-rocker lit and the pin H2, Fig. 17, is similarly lubricated by oil splashed from the sump I2, Fig. 15, into the oil-catching pocket I28 at the inner end of the nipple i28 which is connected by the oil-pipe I29 to the nipple I30 threaded into the head end I3I, Fig. 17, of the pin H2 which has a wick-filled bore i152 and ports I33 leading to the bearing surfaces.

By referring to Figs. 12 and 14, it will be observed that the feed-bar N38 is provided with a wick-filled pocket 13 3 and the feed-actuating lever is provided with wick-filled pocket I35. The pocket 53$ communicates with and lubricates the bearings for the pins ifld and 523, Fig. 5. The pocket l55 lubricates the feed-eccentric Ill and follower block MB. Oil is conductedby gravity to the pockets Ht, I35 by conduits I35, leading downwardly from thewick-filled reservoir i31 mounted on the cover-plate it and fed by-theoilcatching pocket I38 at the inner side of such cover-plate.

The bearings for the looper-actuating rock-v shaft 93 are lubricated from. the oil-catching pockets i lil and Mil Figs. 14 and 15, and oil fed to the groove 339 and port Mil in the rock-.

shaft 98. from the oil-catchingpocket Iil is conducted by the holes 859, M2 to the ball-andsocket bearing 9i.

The rear wall of the feed and looper compartment it is closed by the removable coverplate M3. The outside wall of the feed and looper compartment it has an access opening thererhrough which is closed by the removable cover-plate M5 on which is mounted the needleguard fixture i 35 carrying the needle-guard M5.

The end of the upper shaft 22 whichprojec'ts outwardly through the belt-compartment coverthrough the rotary take-up device within the housing I52 and thence externally of the housneedle-bar. From the take-up I ii the threads run down through the guides I62 to the needles Detachably secured to the machine bed I, flush with the throat-plate BI, is thecloth-plate I63 having near its front edge a depending'hlngepin ltd carrying the guard I65, Fig. 19, for the exposed connections of the looper-mechanism. The guard I65 is yieldingly retained in closed position by the arms of the U-spring 1%, Fig. 14, which grip the thread-guide post I57.

Communicating with theoil-sump I2, Fig. 10, is an oil well l6! into which dips aremovable oil-gage-rod I68 having a mark I69 thereon to indicate the proper oil level to be maintained within the sump I2.

While the machine is operating, the space within the oil compartment I is filled by an oil mist and spray produced by ,the agitator IIII. This mist thoroughly lubricates all of the ballbearings as well as the parts of the looper-actuating mechanism-within the oil compartment. Notwithstanding this flush lubrication within the oil compartment, the loopers themselves and thread-and work-handling parts are maintained dry and un-contaminated by oil, yet the feeding mechanism is automatically lubricated. The machine is also easy to thread up and access may be readily had to any part with a minimum loss of time.

The invention is. not to be understood as limited to the specific embodiment thereof shown and described.

Having thus set forthv the nature of the invention, what I claim herein ISL- 1. A sewing machine having a hollow frame and a bracket-arm, said frame having within it to oil mist in said oil-splash compartment, a belt including a bed having a bottom wall, a standard a vertical partition extending from the bottom connection between said shafts in said belt compartment, a reciprocatory needle actuated by said upper shaft, a looper actuated by said lower shaft, and an oil agitator in said oil compartment.

2. A sewing machine having a hollow frame including a bed having a bottom wall, a standard and a bracket-arm, said frame having within it a vertical partition extending from the bottom wall of the bed through the standard to the top wall of the bracket-arm and dividing said hollow frame into an oil-splash compartment and a belt compartment, 9. lower main shaft extending hor zohtally through said compartments, an upper shaft extending horizontally through said compariments, bearings for said shafts exposed to oil mist in said oil-splash compartment, a belt connection between said shafts in said belt compartment, a reoiprocatory needle actuated by said upper shaft, looper actuated by said-lower shaft, a removabl cover-plate closing said belt compartment, an oil agitator in said oil compartment, and a belt-pulley and rotary looperthread take-up carried by said shafts externally of said oil and belt compartments.

3. A sewing machine comprising a frame casting including a bed, standard and overhanging bracket-arm, said frame casting having an internal partition dividing the space therewithin into a splash-lubrication compartment and an open-faced belt compartment, a cover-plate closing the open face of said belt compartment, upper and lower rotary shafts each dournaled at one end in said partition and extending through clearance apertures in said cover-plate, beltconnected sprockets on said shafts within said belt compartment, a reciprocatory needle actuated by said upper shaft, looper and feed mechanisms actuated by saidlower shaft and including looper-actuating eccentrics and followers disposed in said splash-lubrication compartment, a rotary looper-thread take-up mounted on said upper shaft exteriorly of said belt compartment,

vertical internal partition dividing the space within. the casting into an oil-splash; compartment and an open-faced belt compartment, an upper rotary shaft disposed in, said bracket-arm and journaled at one end in said partition, a lower rotary shaft'dlsposed in saidbed and journaled at one end in said partition, belt-sprockets and a connecting belt carried by said shafts in said belt compartment, a reciprocatory needle actuated by said upper rotary shaft, a looper,

. looper-actuating mechanism including looper-act-uating eccentrics carried by said. lower rotary shaft within said oil-splash compartment, a re-,

movable'cover-plate closing said belt compartment, and means to splash oil in said oil-splash compartment.

6. A sewing machine having a. hollow frame casting including a bed having a bottom wall, a standard and a bracket-arm,'said casting having within it a vertical partition extending from the bottom wall of the bed through the standard to the top wall of the bracket-arm and dividing the hollow frame into an oil-splash compartment and a belt compartment, a lower main shaft extending horizontally through said compartments, an upper shaft extending horizontally through said compartments, a belt-connection between said shafts within said belt compartment, a reciprocatory needle carried by'said bracket-arm and actuated by said upper shaft, a looper mounted in said bed and connected to be actuated by a portion of the lower shaft within 'said oil compartment, a four-motion feed-dog connected to be actuated by a portion of said a lower shaft exterior to said oil compartment, and

oil-splashing means in said oil compartment.

7. A sewing machine having a hollow frame comprising a bed, standard and overhanging bracket-arm terminating at its free end in a head, said hollow frame having internal partitions dividing the space therewithin into a needlebar-meehanism compartment H in said head, a feed and looper compartment l8 in that portion of the bed directly below said head, an oil-splash compartment 1 in said bed, standard and bracket-arm, and a belt-compartment 8 in said standard, an upper rotary shaft extending from compartment 8 through compartment 1 into compartment II, a lower rotary shaft extending from compartment 8 through compartment I into compartment ill, a needle and needle-bar mechanism connected to the upper shaft within compartment H, a looper mounted in compartment l0, looper-actuating mechanism connected within compartment 1 to be driven by the lower shaft, a feed-dog and fe'ed-dog-actuating mechanism connected to the lower shaft in compartment il, a sprocket-driven belt connecting the upper and lower shafts within compartment 8, and oilsplashing means actuated by the lower shaft in compartment 1. I

8. A sewing machine having a hollow fram including a bed, standard and bracket-arm, said frame having within it a substantially oil-tight splash-lubrication compartment, a main-shaft Journaled in said frame and entering said compartment, two looper-actuating rock-shafts journaled in said frame and entering said compartment, mechanism driven by said main-shaft and disposed within said compartment for actuating said rock-shafts, a reciprocatory needle carried by said bracket-arm, a complemental looper in said bed, a looper-carrier pivotally supported by one of said rock-shafts externally of said compartment, an operative connection externally of said compartment between the other rock-shaft and said looper-carrier, and means to splash oil in said compartment. I

9. A sewing machine having a frame formed with a bed and an overhanging bracket-arm, said frame having an oil-splash compartment, a main-shaft Journaled in said bed and passing through said compartment, driving elements on said shaft within said compartment, a reciprocatory needle carried by said bracket-arm, a

rock-shaft Journaled below and parallel to said main shaft in a wall of said compartment and connected to be actuated by one of said driving elements, a looper-carrier fulcrumed on said rockshaft exteriorly of said compartment, a second rock-shaft Journaled above and transverse to said main-shaft in a wall of said compartment and connected to be actuated by another of said driving elements, a crank-arm carried by said second rock-shaft exteriorly of said compartment, a linkconnection between said crank-arm and loopercarrier, a looper mounted on said looper-carrier in cooperative relation with said needle, and oilsplashing means within said compartment.

' 10. A sewing machine having a frame formed with a bed and an overhanging bracket-arm, said frame having an oil-splash compartment, a main shaft journaled in said bed and passing through said compartment, driving elements on said shaft within said compartment. a reciprocatory needle carried by said bracket-arm, a rock-shaft journaled'below and parallel to said main shaft in a wall of said compartment and connected to be actuated by one of said driving elements, a

shaft in a wall of said compartment and connected to be actuated by another of said driving elements, a crank-arm carried by said second rock-shaft exteriorly of said compartment, 9. linkconnection between said crank-arm and looper carrier, a looper mounted on said looper-carrier in cooperative relation with said needle, and a cloth-plate detachably mounted on said bed and including a hinged portion guarding said crankarm and link-connection when in closed position.

11. A sewing machine having a frame formed with a bed and an overhanging bracket-arm, said frame having an oil-splash compartment, a main. shaft journaied in said bed and passing through said compartment, driving elements on said shaft within said compartment, a reciprocatory needle carried by said bracket-arm, a rock-shaft journaled below and parallel to said main shaft in a wall of said compartment and connected to be actuated 'by one of said driving elements, a loopercarrier fulcrumed on said rock shaft exteriorly of said compartment, 2. second rock-shaft journaled above and transverse to said main shaft in a wall of said compartment and connected to be actuated by another of said driving elements, a crank-arm carried by said second rock shaft exteriorly of said compartment, a linkconnection between said crank-arm and loopercarrier, a looper mounted on said looper-carrier in cooperative relation with said needle, and work-feeding mechanism disposed exteriorly of said compartment and including feed-lift and I said head, an upper shaft disposed in said bracket-arm and extending through a bearing in said partition into said head, anda reciprocatory needle-bar mounted in said head and connected to be actuated by said shaft, said head having an oil-catching pocket below said shaft, and said frame having an oil-drainage duct extending from said pocket'through said partition to said compartment.

13. A sewing machine having a hollow frame including a bed, standard and bracket-arm, a

- hollow shaft journaled in said bracket-arm and constituting a rotary oil-reservoir, a crank on said shaft receiving oil from said reservoir, a remov 9. main-shaft extending through said compart-' ment, two looper-actuating eccentrics on said shaft, a.;bearing bushing fixed in said frame and extending at its inner end into said compartment, said bushing having an oil-catching pocket at its inner end to lubricate the bearing surface within said bushing, a hollow rock-shaft-journaled in said bearing and extending at its inner end into said compartment, said rock-shaft having a bearing head at its outer end and an oil-catching pocket at its inner end-in communication wit said bearing head, a looper-carrier journaled in' said bearing head, an eccentricfollower arm fixed to said rock-shaft within said compartment and embracing one of said looper-actuating eccentrics, means actuated by the other of said eccen- 1 tries to rock said looper-carrier relative to said bearing'head, and an oil agitator within said compartment.

'15. A sewing machine having a' frame formed with a splash-lubrication compartment, a mainshaft extending through said compartment and having therewithin an eccentric crank-portion, a rock-shaft journaled in said frame and extending through a wall of said compartment, means actuated by said eccentric crank-portion for rocking said rock-shaft, a crank-arm fixed to said rock-shaft exteriorly of said compartment and having a ball at its free end, said rock-shaft and crank-arm having communicating oil-holes leading to said ball, an oil-catching means in said splash-lubrication compartment in communication with the oil-hole in said rock-shaft, a loopersupporting rock-shaft actuated by said mainshaft, a looper-carrier iournaled on said rockshaft, a link connection between said looper-car- .rier and ball, and an oil agitator in said compartment.

ANDREW B. CLAYTON.

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