US1934259A - Sewing machine - Google Patents

Description

A. B. CLAYTON SEWING MACHINE Nov. 7, 1933.

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SEWING MACHINE Filed May 8, 1951 5 Sheets-Sheet 2 Nov. 7, 1933. A. a. CLAYTON SEWING MACHINE Filed May 8, 1931 5 Sheets-Sheet 3 Nov. 7, 1933. A. B, CLAY-10N 1,934,259 A SEWING MACHINE Filed May 8, 1931 5 Shets-Sl'ieet 4 Nov. 7; 1933. Y A. B. CLAYTON 1,934,259

SEWING MACHINE Filed May 8, 1951-- 5 sheets-sheet 5 f gwumtoz wma@ I Patented Nov. 7, 1933 y UNITED STATES PATENT ori-ICE SEWING MACHINE Application May 8, 1931. Serial No. 535,953

7 Claims.

This invention relates to sewing machines, more particularly of the feed-o'-arm type, and has for an object to provide simplified and improved mechanism for actuating the feeding and loop-taking mechanisms within the work-supporting arm. Another object of the invention is` to provide the machine with a simplified needlethread controller or take-up. A further object of the invention is to provide simplified means for the eiicient lubrication of the machine. The invention also aims to provide for the ready accessibility of the mechanism, for inspection, adjustment or repair.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter described and particularly pointed out in the appended claims.

The features of the invention and the advantages attained thereby, will be readily understood by those skilled in the art from the following detailed description of a preferred embodiment of the invention illustrated in the accompanying drawings in which Fig. 1 is a front side elevation of the machine with the work-supporting arm in vertical longitudinal section. Fig. 2 is a top plan View of the work-supporting arm. Fig. 3 is a detail view of an element of the louper-actuating mechanism. Fig. 4 is a horizontal section through the machine at the level of the main-shaft. Fig. 5 is a perspective view of a lever-element of the feeding and looperactuating mechanism. Fig. 6 is a detail sectional view of an oil-pump with which the machine is preferably equipped. Fig. 7 is a vertical sectional View through the machine frame transversely of the main-shaft.

Fig. 8 is a section on the line 8-8, Fig. 2. Fig. 9 is a section on the line 9 9, Fig. 2. Fig. 10 is an elevation at the needle end of the machine toward which the free end of the worksupporting arm extends. Fig. 11 is a section on the line 11--11, Fig. 4, and Fig. l2 is a vertical sectional view on the line 12--l2, Fig. 7.

The machine is constructed with a frame including the spaced hollow standards 1 and 2 connected by the hollow bridge-member 3 the bottom wall of which bridge-member is extended across the standards 1 and 2, as shown at 3 and 3", Fig. 12, to form an oil-reservoir. The framecasting is formed at the top of the standard 1 with a forwardly extending hollow arm 4 from which depends a hollow vertical arm 5 to the lower end of which is secured by screws 6 the hollow horizontal work-supporting arm 7. Disposed directly above the free end of the worksupporting arm 7 is the head 8 which projects forwardly from the standard 2 and supports the reciprocating needle-bar 9 and presser-bar 10 carrying, respectively, the needles 11 and presser- 60 foot 12. The presser-bar is engaged at its upper end by one end of a leaf-spring 13 the other end of which is anchored bythe pin 14 to the arm 15 extending rearwardly from the cover-plate 16 which is detachably secured by screws 17 to the 65Y upper end of the standard 2 and head 8. An adjusting screw 18 carried by an overhanging arm 19 on the cover-plate 16 exerts the desired degree of pressure upon the spring 13. Thus the entire presser-spring assembly is carried by the remov- 'l able cover-plate 16 which is preferably seated upon an oil-tight gasket 20.

Journaled longitudinally of and within the hollow bridge-member 3 in the four alined bearings 21, 21` 22, 22, at the upper ends of the re- 75 spective standards 2 and 1, is the main-'shaft 23 which is made in two end-to-end sections 23e, 23b joined by the coupling sleeve 24. The sleeve 24 is formed at its opposite ends with reduced taper-threaded and longitudinally split portions 25 which are clamped upon the shaft-sections by the ring-nuts 26. The main body of the sleeve 24 is also secured to the shaft-sections by setscrews 27.

The main-shaft section 23.a is formed with a crank 28 which is connected by a pitman 29 to a lever 30 fixed to a rock-shaft 3l, Fig. 4, journaled at its opposite ends in bushings 32 in the head 8. The lever 30 has pivotally connected to its forward end a link 33, Fig. l0,4 the lower end 90. of which slidably engages the horizontal pin 34 projecting laterally from and fixed to the needlebar 9.

The presser-bar 10 has fixed to it a lateral arm 35, Fig. 1, carrying a roller-stud 36 which is 95' adapted to be engaged by the presser-lifting lever 37 fulcrumed at 38 on the side of the head 8. The rearward end of the presser-lifting lever 37 is connected by a link 39 to a crank-arm 40 fixed to one end of a rock-shaft 4l journaled hori- 100 zontally in the standard 2 and having fixed to its opposite end a crank-arm 42 which is to be connected by a pull-chain 43 to the usual presserlifting treadle (not shown). There is also provided the usual hand-operated presser-lifting cam-lever 44 fulcrumed at 45 on the side of the head 8 and having a presser-lifting cam-portion 46 in engagement with a roller-stud 47 on thelever 37.

The feeding mechanism comprises a feed-dog tively series which is located at the the loopers 73, as is desirable.

48 in cooperative relation with the presser-foot 12 and carriedby the feed-lever 49 which is formed at its end remote from the feed-dog 48 with a slot 50 slidably embracing the block 51 journaled on the stud-pin 52 .xed in one side wall of the hollow work-supporting arm 7. The feed-bar 49 is supported between its ends by the vertical links 53 which rise from one end of the primary feed-lift lever 54 fulcrumed at arm 7.

The primary feed-lift lever 54 carries at its other end a pivotally mounted block 55 which is embraced by the forked Aend of a second feedlift-lever 56 fulcrumed at 57 in the arm 7. The upwardly inclined end of the second feed-lift lever 56 remote from the feed-dog 48 is connected by a ball-joint 58 to the lower is connected at its upperend by a ball-joint 60 to the short arm 61, Fig. 7, of a three-armed lever (Fig. 5) fulcrumed on the cross-pin 62 at the upper end of the vertically depending arm 5. The three-armed lever referred to has an upwardly extending arm 63 which is connected by a ball-joint 64l to one end of a pitman 65 the opposite strapped end of which embraces a ballcrank 66 formed in the main-shaft section 23h. It will be observed that the fulcrum 55 for 'the primary feed-lift lever 54 is disposed nearer to the feed-bar-supporting links 53 than to the block 55 and that the fulcum 57 of the secrond feed-lift lever 56 is disposed nearer to the block 55 than to the actuating link 59. In other words both levers 54 and 56 have relalong power-arms and relatively short work-arms. These levers are compounded in relation and exert a powerful lift upon the feed-bar 49 from a relatively small force imparted to the feed-lift link 59. The two feedlift levers 54 and. 56 also permit of a reversal of motion of the link 59, whereby it moves upwardly to lift the feed-dog and downwardly to lower the feed-dog. This is of-special advantage in combnationwith the looper-actuating mechanism, as will be hereinafter described.

The feed-bar 49 is given its endwise or feedand-retum movements by means of a link-connection 67 with a crank-arm 68 fixed to the lower end of a vertical rock-shaft 69 journaled in the vertical arm 5. The roc -shaft 69 has fixed to its upper end a crank-arm 70, Fig. 4, which is connected by the pitman 71 to the usual adjustable feed-eccentric 72 on the main-shaft section 23h.

-The thread-carrying loopers 73,-which cooperate inthe usual manner with the needles 11 in the formation of stitches, are fixed to the rocking and sliding looper-shaft 74 which is journaled within and lengthwise of the work-supporting arm 7 in three alined bearings 75, Fig. 1. Fixed to the looper-shaft 74 between two of the bear,- ings 75 which ateV relatively close together is a crank-arm 76 which to the third arm 78 of the three-armed lever 61, 63, 78 previously referred to. A single crank 66 on. the main-shaft thus operates to advance and retract the loopers 73 and raise and lower the feed-dog 48. .'Ihe crank 66 actsupon asingle pitman 65 in the upper forwardly projecting' arm 4 to rock the three-armed lever 61, 63, 78

juncture of the Iraniearxns 4 and 5 and operates through thetwo links 59 and- 77 in the vertically depending arm 5 to simultaneously raise the feed-dog 48 and advance This simple mechanism for transmitting the necessary motions shaft 74 is formed 55inthe` end of. a link 59 whichV rock-shaft is connected by the link 77' to the feed-dog and loopers from the main-shaft through the three angularly related hollow arms of a feed-oif-arm sewing machine is a feature of the present improvement.

The hub of the crank-arm 76 on the looperwith an end-face 79, Fig. 3, which is spaced from the end-face 80 of a collar 81 also fixed to the looper-shaft. These endfaoes embrace a block 82 pivotally carried by a to its upper end a crank-arm 85, Fig. 4, which is connected by a 'pitman 86 to the looper-actuating eccentric 87 on the main-shaft; `the eccentric 87 giving to the loopers their sidewise components of motion or so-called needle-avoiding movements. It will be observed that the upper forwardly projecting arm 4 houses only three simple pitmen 71, 86, 65 which transmit all of the necessary motions to actuate `the feed-dog and loopers; simplicity being one of the chief aims of the present improvement. The three bearings for the louper-shaft, two of which are close to and on opposite sides of the crank-arm 76, prevent whipping or springing of the loopershaft-under high-speed operating conditions. A counter-weight 88 applied to the hub of the three-armed lever 61, 63, 78, satisfactorily balances the mechanism to which it is connected and greatly reduces any tendency of the machine to vibrate.

'Ihe needle thread controlling mechanism comprises the "needle-thread take-up guidebracket 89 mounted on the needle-bar 9 and needle-thread controlling or take-up lever 90 fixed to the rocking fulcrum shaft 31 to which the needle-actuating lever 30 is fixed. There isy also a. slack-thread controller-arm 91 fixed to a 92 to which is also xed an arm 93 having a forked endembracing a lateral stud 94 fixed to the presser-bar 10. The course of the needle-threads n is indicated by the dash and dot *lines in Fig. 7.

The louper-threads run from the louper-thread tension devices 95 to the usual guides 96 associated with the louper-thread take-up cam'97 xed on the main-shaft; thence through the looper-thread guide-troughs 98 and into the work-supporting arm 7 through which they extend to the loopers through the slot 99 in the side wall of the'arm 7.- 'Ihe looper-thread take-up deviceis covered by the cap 100, Fig. 11, hinged at 101 to swing upwardly and expose the usual twoarmed guide 96 which may be swung outwardly about its pivot. 102 for convenience in threading. The spring 103 holds the -guide 96 yieldingly in working position:

'I'he lubricating system comprises the oil-' sump 104 for d by the closed bottom of the horizontal bri e-member 3 and the bottom walls 3 and 3" in the standards 1 and 2. Oil is raised from the sump through the intake pipe 104x by'nieans of a hand-pump104 operated by the handle 105 on the piston 106 anddischarged through the pipe 105' into the elevated reservoir 106' from which it runs by gravity through the conduits l107 to the various bearings to be lubricated. An overflow pipe 108 connects the reservoir 106( to the sump 104. 'I'he hand-pump 104', intake pipe 104x, and discharge fpipe 105' are in the form of a unitary assembly carried by the plate 105x which closes the aperture 105" in the hollow sewing machine frame. By unscrewing the plate 105x from the frame, the unitary pump assembly including the pipes 104x and 105' may be removed from the machine. The pump 104' need be operated only at infrequent intervals,

say once or twice a day. Oil may be drained from the sump by removing the plug 109 between the standards 1 and 2.

The top side of. the upper forwardly extending arm 4 is closed by the removable cover-plate 110 to the opposite ends of which are hinged at 111, 112 the respective trap-doors 113, 114 which carry the knobs 115, 116 by which they may be opened for access tothe operative connections of the mechanism within the arm 4.

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

1. A feed-oif-arm sewing machine having, in combination, a main-supporting standard, an upper forwardly projecting arm joined at one end to said standard, a depending arm carried by said forwardly projecting arm, a horizontal work-supporting arm carried by said depending arm, a main-shaft journaled in said main-supporting standard, a reciprocating needle operating above the free end of said work-supporting arm, a rocking and bodily endwise movable feedbar mounted in said work-supporting arm, a rocking and bodily endwise sliding looper-shaft mounted in said work-supporting arm, an eccentric on the main-shaft and connections operated by said eccentric for rocking the feed-bar and looper-shaft, a second eccentric on the main shaft and connections for sliding the loopershaft, and a third eccentric on the main-shaft and connections for moving the feed-bar bodily endwise.

2. A feed-oif-arm sewing machinel having, in combination, a main-supporting standard, an upper forwardly projecting arm joined at one end to said standard, a depending arm carried by said forwardly projecting arm, a horizontal worksupporting arm carried by said depending arm, a main-shaft journaled in said main-supporting standard, a reciprocating needle operating above the free end of said work-supporting arm, a rocking and bodily endwise movable feed-bar mounted in said work-supporting arm, a rocking and bodily endwise sliding looper-shaft mounted in said work-supporting arm, an eccentric on the main-shaft and connections operated by said eccentric for rocking the feed-bar and looper-shaft, a second eccentric on the main-shaft and connections for sliding the looper-shaft, and a third eccentric on the main-shaft and connections for moving thefeed-bar bodily endwise, the said connections with the three eccentrics including three respective pitmen extending within and lengthwise of said forwardly projecting arm.

3. A sewing machine having a frame formed with a main-supporting standard and a hollow arm free at one end and at its other end joined to said standard, said arm including an upper forwardly projecting portion a depending portion and a lower horizontal work-supporting arm propen a four-motion feed-dog and a four-motion looper mounted in the lower work-supporting arm, a three-armed lever fulcrumed in said hollow arm at the juncture of the upper forwardly projecting and depending portions, a main-shaft, an actuating eccentric on the main-shaft,a pitinan-connection between said eccentric and one arm of the three-armed lever for rocking the latter, a second arm of the three-armed lever being connected to the feed-dog to raise and lower the feed-dog, and the third arm' of the threearmed lever being connected to the looper to impart loop-seizing and shedding movements thereto.

4. A feed-oif-arm sewing machine having a frame including a standard and a hollow crooked arm free at one end and at its other end carried by said standard, said arm including an upper forwardly projecting portion, a depending portion, and a horizontal work-supporting arm proper, a rocking and sliding looper-shaft and a four-motion feed-bar disposed in said work-supporting arm, a main-shaft in said standard, a looper on said looper-shaft, a feed-dog on said feed-bar, a reciprocating needle, means for rocking the looper-shaft to impart a loop-seizing movement to said looper, said means including an eccentric on the main-shaft and a train of 10G connections from said eccentric to said loopershaft, and means for lifting the feed-bar including a pair of feed-lift levers compounded lengthwise of the work-supporting arm proper and connected to said train of connections so as to be actuated to lift the feed-bar simultaneously vith the advance of the looper to seize a needleoop.

5. A sewing machine having a frame formed with a standard and a hollow overhanging needleand presser-bar head having ',-anbpening in its upper wall, a presser-bar mounted in said head, a removable cover-plate closing Said opening, a leaf-spring carried by said cover-plate and bearing upon said presser-bar, and an adjusting screw, carried by said cover-plate for regulating the pressure of said spring upon the presser-bar.

6. A sewing machine having a frane formed with a standard and a hollow overhanging needleand presser-bar headhaving an opening in 120 its upper wall, a presser-bar mounted in said head, a removable cover-plate closing said opening and formed with a rearwardly extending arm and an overhanging arm, a leaf-spring bearing at its opposite ends upon said presser-bar and rearwardly extending arm, respectively, and'an adjusting screw carried by said overhanging arm and bearing upon said spring.

7. A sewing machine having a -hollow frame including a needle-bar head, a needle-bar mounted in said head, a main-shaft, a crank on said shaft, a needle-bar actuating lever, a rock-shaft journalled in said frame, said lever being fixed to said rock-shaft, an operative connection between said crank and lever, and a needle-thread controlling arm disposed exteriorly of said frame and fixed to one end of said rock-shaft independently of said needle-bar-actuating lever.

ANDREW B. CLAYTON.

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