US1581764A

US1581764A - Sewing machine

Info

Publication number: US1581764A
Application number: US481032A
Authority: US
Inventors: John P Weis
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-06-28
Filing date: 1921-06-28
Publication date: 1926-04-20
Anticipated expiration: 1943-04-20

Description

April 20 1926.

J. P. WEIS SEWING MACHINE Filed June 28 1921 ll Sheets-Sheet l INVENTOR. I077)? Flo 91.5.

ATTO NEYS.

April 20, 1926.

P. WEIS SEWING MACHINE 1921 11 sheets-sheet 2 Filed June 28 m T w flaw 44 5 3,0 1 R 7 s 3 5 5 x w m I i w Fig '5 17 7 7M 4 .M 4 8 4 w 4 INVENTORL 101111 F Mata BX M April 20, 1926.

r J. P. WE IIS SEWING MACHINE Filed June 2 1921 11 Sheets-$heet s ATTO NEYS. L

IN V EN TOR.

BY John? as.

1926f 1,5s1',7s4 J; P. was

SEWING MACHINE Filed June 28 1921 ll Sheets-Sheet "4 I k E 51 A TTOR EYS.

April 20 1926 J. P. WEIS EwINga MAGHlNE Filed June 28 ll Sheets-Sheet 5 u "2 n 1 o" 721 PM: U)%m April 20,1926. 1,581,764 J. P. WEiS SEWING MACHINE Filed June 28 1921 ll Sheets-Sheet, 6

A TTOR EYS.

April 20 1926.

J. P. WEIS SEWING MACHINE Filed June 28, 1921 1 .1 as 54/ 52 as 11 Sheets-Sheet 10 lNVE/VTOR.

T413416 By Jbim Pl/eis.

chine with the end cap or co Patented A r, no, 1926.

UhHTE 'liATiliii issue enn P. were; or NYAQK, new SCORK.

1 V snw ue Innonrnn.

Application f led June 28, 1921 Serial No. 481,032,.

To all whom, it may concern.-

Be it known that I, JQEN if. VVEIS, a citizen of the United States, residing at Nyack, in the county of Bockland and State of New York, h a-ve invented certain new and useful Improvements in Serving Machines, of which the following is a specification.

'llhis invention relates to sewing machines of the type or style having a cylindrical bed or horn wherein the feeding and part of the stitching mechanisms are contained and erator need only guide the Work and manipulate the treadle to control the machine, thereby avoiding the less of time re sulting iron; the continuous stopping nnd turning of the hand wheel during the operation of the machine in order to bring the needles to rest in their highest position and re ise the presser foot to position the Work.

The present invention is an iil'lPlEOfVOlfiGDt over my Patent 1,221,254 dated April 3, 1917, and comprises as a unitary str cture the combination of stitching n'iechanisni, feeding mechanism, needle thread controlling mechanism, speed regulati neehanis n, starting and stopping mechanism, and lubricating iuechanis nj, the machine being adapted to pe orni or carry out a Xvi (l0 va-' riety of stitching operations as wet] ,as different kinds of stitch formation, needle nuuges etc.

()ther objects of this invention will appear in the following d ription thereof refee enee being had to the seconipanyin dramings forming a part of the speci eation, wherein like reference chai indicate corresponding parts in the se al yiew's and wherein 1 is a side ,eleva on of the umi' of theloopn id the ng posit-ion .Lun

trzinslnitter shown in open ,der the machine, but detached from the Wonk tahle to more clearly illustrate the re ihition of the transmitter with the "being broken save-y to clearly show the Win g nachine; Fig. 2 isa top plan View of the transmitter shown in Fig. 1; ,3 is'a;

:i'ront perspective view of the seiving mach ne, transmitter and treadle connected .ifQT operating the same; Fig. 4 1s aperspectine viei v oi -the hand Wheel and its'shait'having clutch teeth (in the end for turning'the niech.

.anisn'i of the machine by handtFig. '5. is a speetive view of the end cap for coverin the looper end thread controlling i echanisins; Fig. 6 anend view of the needle bar operating mechanism,- portions oi hthe needle her bushings, oil cup, and needle bar broken away to clearly showthe const ructi'on, and a portion {of the arnian'd'crank shaft shown in shroken lines; Fig. 7 is a perspective view showing the inside Wall of.

the back cover plate with the'stojp niot ion lever and its connecting parts assenihrled thereto; 8 is a ,hacl ielevation of the machine, illustrating the connections for the needle drive and e portion of the ilg tjer,

and feed actuating mechanisms; Fig. 9 is a detail vie v of the'collar which tennis a retaine to i-1 7 1 p n Q i fragmentary perspective view of a portion of the (crank shaft and stop clutch shaft; Fig. 10 is a tin ve rse section taken suhstantially on line 104 of Fig. 10, endshoivs perticnlarly the stop clutch balls in a clutched positien; A ll a view similar t Fig. 10 hutshonis the stop clutch halls in a ng ne h tching posit on; is a vertical section taken through the vertical coir ter line of thecrank-shatt bee ii g, shot g the crank ;s ha:it, the esseml'glage of the clutch Wheel 1n 1th a portion the stop n otion mechanism, and the clutch hand Wheel for turning the mechanism of the machine y h nd the fr'am f th me be n represented by broken lines; Fig: 12 is a op plan 'yiew of the tlecding mechanism, the overhanging erin and cylinder of the mac in b ng shown n b k n i ie F u sectional View taken en lines of Fig. 15 of the feed and adjusting ineens for changing the length of the stitchgF-i-g. it is a sectional detail viewfitalien on lines 1-1-14 of Fig! l5-.o;f a .pQrtiongoi the feed bar showing the eccentric bushing, lee-k nut and screw which comprises means for liaising and lo ering the 'ieedghig. 15 is n side QiG-Vtitighil of the feeding inechanisn i, parts portion oi she e being indica ed seniblage, the everha rm and the 4 in broken lines; Fig. 16 is a top plan view of the cylindrical portion of the machine illustrating the looper mechanism; Fig. 17

is a side elevation of the mechanism shown in Fig. 16, the overhanging arm of the machine being indicated in broken lines; Fig. 18 is an end elevation of the cylinder, illustrating the mounting of the loopers and needle guards; Fig. 19 is a perspective View of the circular holder for the loopers; Fig. 20 is a perspective View of the arm which supports the circular holder for the loopers; Fig. 21 is a perspective view of the looper; Fig. 22 is a perspective view of the needle guard and holder therefor; Fig. 23 is a detail view of the lower end of the looper actuating connections, a portion being broken away to clearly show the assemblage of the parts; Fig. 24 is an end elevation of the cylinder and looper actuating means, partly in section taken on lines 24- 24 of Fig. 16; Fi 25 illustrates diagrammatically the movement of the looper actuating means; Fig. 26 illustrates diagrammatically the elliptical path of movement of the loopers; Fig. 27 is a diagrammatic view illustrating the manner in which adjustment of the looper mechanism may be made in order to change the oscillation of the loopers from front to rear of the needles,

for cooperation of the loopers with needles of different sizes; Fig. 28 is an end view of the cylinder showing the looper thread controlling means, with the looper in its extreme forward position; Fig. 29 is a perspective view of a group of parts of the looper thread controlling means; Fig. 80 1s view of the parts shown in Fig. 28 with the looper in position for the needle to enter between it and a strand of the looper thread, also showing the thread clamped by the thread controlling mechanism in full and dotted line position, the full lines representing the thread being clamped while the needle is moving downward and the looper is moving backward, and the dotted line position representing the thread clamp open, for free movement of the looper thread while the looper is moving in the opposite direction; Fig. 31 is a fragmentary perspective view of the end of the cylinder, showing a portion of the throat plate,'looper thread clamping means, and the looper thread guide tubes which conduct the thread from the rear of the machine to the thread I controlling mechanism; Fig. 32 is a View thread clamp, and a portion of the rock lever with guide eyes for conducting the thread to the loopers; Fig. 85 is a side elevation showing the overhanging arm of the machine in broken lines, the presser foot and lifting mechanism therefor, also the needle thread controlling mechanism in dotted line and full line positions; Fig. 36 is a detail view showing the portion of the presser foot lifting lever with a latch hook attached thereto adapted to hold the presser foot in lifted position when swung to the dotted line position of the figure; Fig. 37

is a detail plan View of the stop lever, showing its mounting in the cover plate and machine frame, the same being shown in broken lines; Fig. 38 is a side elevation of the stop lever shown in Figs. 7 and 37, the actuating rod therefor, the stop clutch brake shoe and brake shoe lever being shown in full lines, and the frame in broken lines; Fig. 39 is a sectional detail view of the ac tuating rod for the stop mechanism, taken on lines 3939 of Fig. 38; Fig. 40 is a vertical sectional view of the crank shaft and bearings thereof illustrating the manner in which the parts are lubricated from the overhead reservoir and the tubular outlets leading to the several bearings, also showing in elevation the oil pump, the oil pump drive wheel, and the tubes 'conducting the oil from the oil pump to the reservoir at the top of the machine; Fig. 41 is a side elevation of the mechanism shown in Fig. 40, illustrating the drip lip attached to the inside inclined face of the rear cover for conducting a portion of the lubricant to the shock absorbing oil buffer carried by the stop lever; Fig. 42 is a detail View of the reservoir at the top of the machine, portions broken away to show the filter and the construction of the oil gauge or indicator; Fig. 43 is a sectional view of the rotary top stitch forming mechanism, the machine frame and cylinder being indicated in broken lines; Fig. 44 is an end view of the mechanism illustrated in Fig. 43, the crank shaft and the frame of the machine being indicated in broken lines; Fig. 45 is a sectional view of the presser foot and stitch mechanism carried thereby, taken on the lines 4545 of Fig. 43 looking in the direction of the arrow; Fig. 46 is a sectional view of the presserfoot and stitch forming mechanism carried thereby, taken on the lines 46-46 of Fig. 44; Fig. 47 is a side elevation partly in section of the needle vibrating mechanism for making zig-zag stitches, theneedle bar being shown as pivotally mounted in the head of the machine for swinging, angular, and reciprocatory movement, the frame and cylinder being indicated in broken lines; Fig. 48 is an end View of the mechanism shown in Fig. 47, the crank shaft and frame of the machine beans-lees at right angles to itsdine of vertical reciprocation.

Q 7 77?.(6G7Ii'lt6 frame.

.lleferring particularly ,to Figures 1, '3, :6, 8, 11, :38, 4-1), and 41, it will be seen that the present machine is mounted .on a suitable table 1 and Comprises a machine frame of special

construction having flanges

2 and 3 for supporting and securing the machine to the table. The .main or upright trunk portion of the .ctrarne is preferably .of hollow rectangular construction, closed at the bottom and having .a front Wall 4, and a rear xvall .5 provided with an opening 6 adapted to be closed :by a cover plate I? attached thereto in any suitable manner. This .cover plate has a holloiv projection 8 within which operates a stop lever 118. The outline or shape of the opening 6 is irregular in form and is indicated at 6, 6", r6, 6, 6 and 6, Figure 8, .tlieeover plate 7 being .of similar form and adapted ivhen .closed to seal the opening against :leakage of oil.

. sist in properly conducting the lubricant from one interior part toanother and to finally conduct it into the reservoir formed by the bottom :9 and

side Walls

4, 5, 13, and 16 of the frame. lo empty the reservoir I provide a drain pipe '10. tapped into the bottom '9. The front wall 4 is provided with a boss 11, bored to receive the cylinder 12. The side Wall 13 is provided with a boss 1% to receive one of the crank shaft bushings 15. The opposite side avall 1.6 has a projecting rib'17 parallel to the wall l, curved at :18, and provided with two bosses 19, the rib extendingdoxvn the opposite side, parallel to the rear .ua'll 5 as at 20, Figure 38.

Located on the side wall 16 .near the bottom a boss 21, .forniing together with the bosses 19 a suitable seat for the belt guard 2 which covers :the drive lbfilt 23, and .the

eluteh and pump Wheels 93 and Y425.

The sidewall 16 has a rectangular op.en-

ingil linto which projects the laterally extending portion 118 of the stop lever, Fig ure 37, this opening also affording a passage for the lubricant returning from the outer litterin of the bushing 99 .carried by the belt guard 22, Figures :8 and 11. Above the opening 2d .inlthe side wall 16 is an inwardly projecting boss 2.6 bored to receive hm-

ihings

101 and 101 for supporting the crank shattt. The .top portion of the frame carrying the boss is indicated at 2'7 and the top Wallofthe frame at28, Figure 40, wherein the needle driving means outer walls '35 a operate.

and oil distributing reservoir is located. Projecting in v; 'dl in the front Wall is a boss 2.9 also ,bored to receive a bushing 29 for supp ting h crank 113 dj to the hottoinfi of he fla e d lo a e in the side all 16 is an inwardly projecting boss 30 bored to receive a pump casint: 31..

Projecting from the front ivalllis an overhanging arm '32 terminating in the needle :bar and presser bar bearings 33, having Above these bean ings is a rectangular opening l l througlii which the pressed spring and ii ter lever vided with

suitable bearings

37 and 38 for the needle operating rock shaft Secured to the forward end of the reel; shaft 39 by screws l0 is a needle bar operating ar-m all. The end of the shaft 39 is tapped to receive a serew 42 and a thrust Washer 43 thereby to prevent end movement of the arm all on the shaft 39. At the outer end of the arm d1 by means of a joint pin 4A is secured a link 15, thebottoin end thereof being vconnect-ed by neans of a joint pin 16 to anend piece 4t? tapped into the needle bar 4:8 and claiinped With a lock nut 419. 'llhe needle bar is liolloiv and the lowerxend is tapped to receive the needle holder i which carri th needles 51. The needle bar is provided with two openings 52, the upper one being inlet and the lower one an outlet for 'oil for the purpose of internally oiling the upper and lower needle bar lbushings, '50 and ,54.

Secured to :thetop of the upper bushing 5-.t is an oil cup provided with a felt o le .Calirying sufficient lubricant for the needle bar, but preventing the .oil from dripping and soiling; the goods. An interinediate felt .oiler 56 is provided between the two bushings. These felt ,oilors Wipe the needle bar in its rec.ipnocating inoven'ient, keeping it clean and properlylubricated.

To the rear end or iocli shaft 39, ad jacent to the bearing 3.7 is secured a crank arm 57 and ball stud 58, to which is connected the upper end ot a l all connection 59. The lower end .50 also has a hall socket to. lit over the ball 61 of the crank shaft.

This oi erhanging arm e2 is pl'oin l The rota-1 y drive of Gran]: shaft and its clutch moo/mutants.

ll ith reference particularly to Figures 8,

9. 1O 11, and d0 thecranl; shaft comprises 9 a a .r 7 bearing portions ()9. and es, the bearing; 62

being integral with the crank disc (31 andthe 1321 11161. The crank 65 is integral with the ball .61 and the portion theshaft 63, the crank 66 s also ntegral in portion 62 of the crank shaft is provided with a series of clutch teeth 72 to co act with other clutch teeth 73 carried by a stub shaft 74L secured to ahand wheel 75 adapted for the purpose of turning the crank shaft and operating the mechanism of the machine by hand, if desired. The shaft 7 1 is provided with a reduced neck 76 for the reception of the coiled spring 77 carried in the annular groove 78 of the lmshing 15. The position of the spring with respect to the shaft neck 713 is such as to normally hold the clutch teeth T3 out of engagement with the clutch teeth '72, the contraction of the spring on the edge 79 of the neck tending to draw the shaft outward. Thus when the hand wheel 75 is forced inward by the hand of the operator to engage the clutch teeth for turning the shaft, the spring 77 is forced out of the neck and is expanded so as to cause the same to embrace the edge 79. When the inward pressure of the hand upon the wheel is removed, the contraction of the spring draws the shaft to a position where the spring enters the neck 76, disengaging the clutch teeth, and thus preventing the wheel from rotating during the operation of the machine.

From the foregoing it will be understood that I have provided a means, in the form of a hand clutch wheelwhereby the mechanism of the machine may be readily turned bv hand. such means being easily detachable from the machine by withdrawing the .same as illustrated in Figure 4. This feature is of considerable importance as it avoids the rotating of the hand wheel each time the machine is started, thus saving considerable power, and obviating the necessity of stopping the'wheel since the same 1n the present machine is disconnected from the shaft at the time of starting and stopping and during the operation of the machine. In order to quickly start and stop a mechanism that is operated at a high speed such as three or four thousand revolutions per minute, all unnecessary weight and bulk of rotary parts must be eliminated. An important advantage of this improved machine resides in the elimination of the weight of the usual hand wheel in operation and the centrifugal force set up thereby, whereas if the wheel were directly connected to the shaft it would be very difficult, if not. impossible, to bring the parts operating at such high speeds to a dead stop instantly, with-- out excessive wear and tear on the mechanism.

The usual sewing machine is provided with a hand wheel which is grasped by the hand of the operator at the end of each stitching operation. The wheel is then turned to raise theneedle to a position of rest to permit the removal of the work. This continuous stopping and turning of the hand wheel during the rapid operation of the machine becomes a laborious task, as it must often be repeated thousands of times daily,thereby consuming a considerable part of the operators time. In many instances ten to twenty per cent of the time consumed in stitching operations is spent in manipulating the hand wheel. In the present machine this stopping of the machine and turning of the wheel. by hand to bring the needle at rest in its highestposition is obviated by virtue of the provision of a positive stop motion in the present instance the same em bodying certain improvements over my Patent No. 1,352,332 3, dated September 7 1920. A detailed description of these stop motion parts is deemed unnecessary since the same are fully described in the aforesaid patent.

Referring particularly to Figures 7, 8, 9, 10, 11, 37, and 38, it will be seen that the portion ofthe shaft is drilled at 80 to receive the reduced end 71 of the stop clutch shaft. A portion of the shaft extension 70 is enlarged to form the semi-circular keyway 81 which extends the entire length of the hole 80 and receives a semicircular key 82 formed as an integral part of the reduced portion 71. of the stop clutchshaft. The telescoping of these parts provides a convenient way of connecting the parts for quick coupling and uncoupling, as it is necessary at times to withdraw the stop clutch shaft in order to renew the wedge blocks 83 hereinafter described or other parts.

Adjacent to the. end portion 70, of the crank shaft, and between the faces of the

bushings

101 and 101, is located a collar 86 provided with a hole 87, and a key Way 87*, adapted to receive and embrace the end 71 of the stop clutch shaft for rotary move- 1 ment therewith. The bushing 101 is recessed to receive the collar 86 so that the faces of the two bushings are flush with each other, thereby limiting the movement of the collar. A coil spring 87 is carried in a groove 88 terminating at 87 on one side of the center line of the shaft hole 87, see Figure 9, and on'the other side terminating at 87. The groove has two

openings

87 and 87 through the rear wall of the 1 collar 86, and through these openings the end of the spring 87 may be seen when assembling the parts, as one end of the spring abuts against the end 87 while the other end exerts pressure against a pin 89 projecting through the opening 87 and secured. to and carried by a rockable stop clutch. sleeve 90.

The stop clutch sleeve 90 is bored to fit over the reduced end portion 71 of the stop clutch shaft and such bore is also provided. with a semi-circular key-way to fit over the semi-circular key 82. The enlarged section 85 of the stop clutch shaft is provided with three radially disposed pockets 84L into which relieved the clutch is engaged and the crank shaft of the machine is coupled with the drive wheel 93 for rotary motion. Further downward movement of the starting rod increases the speed at which the machine may be driven. Now the reverse of this actionfirst the speed is slowed down, then the roller 115 disengages the brake lever, pressure is applied to the clutch sleeve to disengage the clutch that is disconnecting the power from the crank shaft ofthe machine, instantly the stop finger end 122 engagesthe clutch'tooth 103 and the machine is stopped. The presser foot and thread handling means has had no action up to that time. Further upward movement of the starting rod causes the presser foot to be lifted from the work. With this action of lifting the presser foot the thread control-- ling means is operated.

Thus the machine can be started and stopped at all variations of speeds without raising the presser foot because it is the downward movement of the rod 137 that controls the speed of the machine and shifts the stop finger away from the stop clutch to varying degrees, the adjustments of the parts being such that when the stop finger is disengaged from the stop clutch, the machine operates at very slow speed; as it is 1 gradually moved away. from'the clutch the speed is increased. The reversal of this action gradually slows down the speed until the machine is stopped. This refers of course to a. slow movement by the foot of the operator; a fast movement by the foot of the operator will cause the machine to start at full. speed instantly and come to a stop also instantly. The starting and stopping mechanism can be operated without operating the presser foot or thread pull-off means because the stop lever is under the control of the spring 126 aii'd when the parts of the machine are in stopped position the end 136 of the rod is not yet in contact with the end 177 of t-helever for actuating the foot or thread pull-01f. To actuate these parts further upward movement of the parts is required.

The power transmitting: mechanism.

under surface of the table 1 in any suitable manner, the bracket having an arm bored to receive a shaft 144. shaft 1s mounted a cone pulley 145 over which operates the belt 146 for transmitting power from any suitable line shaft to the pulley. This pulley 145 is provided with a frictional surface 147, co-acting with a similar frictionalsurfaee 148 of the driven pulley 149 also carried by the shaft 144. The belt 23"is driven by the pulley 149 for Upon this operating the sewing machine. A bracketed lever'150 is carried by the rock shaft 151 supported in the arm 152 for rocking movement, and the forwardly projecting end 153 of the lever 159 has a suitable angular or camming face adapted upon rocking the lever inwardly to exert inward pressure on the cone pulley 145 thereby to force the

frictional surfaces

147 and 148 together so as to clutch the pulleys 145-and 149 for r0- tation. i

The shaft 151 has rockably supported thereon at 154 the lever 139, provided with a stud 155 to which is connected the upper end of a rod 156. The lower end is connected by a coupling 157 to a rod 158 connected to a floor treadle 159, whereby the transmitter may be operated in order to con trol the speed of the machine.

A brake lever 161'is also secured to. the shaft 151, and'the arm 152 is provided with alug 162 having a spring 163 interposed between it and a lug 164 carried by the brake'lever 161. The latter is provided with a frictional surface 165 to engage the rim 166 of the pulley 149 in order to quickly stop the pulley each time the rod 156 is thrust'upward to shut off the power. Attached to the bracket 143 is projecting member 16? carrying a stub shaft 168 upon which rotates an idler pulley 169, which directs the upward run 170 of the belt 23 to the clutch wheel 93.

The speed regulator.

together with greater pressure so that illcreased speed is obtained. By reversing the adjustment the pressure on the frictional surfaces is decreased and slippage results so that the speedof the pulley 149 and the sewing machine is thereby reduced. This speed regulation is of great importance when operating upon difficult work, and particularly when an inexperienced operator is at the machine, inasmuch as without a speed regulator the machine is liable to start at the highest speed and the operator would lose control of the work. \Vith the present improvement the requisite speed may be had by simple adjustment of the parts described tosuit the desired or necessary conditions.

The power trmismc'ttinf mechanism. CONN-9% weal.

The lever 150 and the brake lever 161 are secured to the rock shaft 151' and hence a and 3. The inner downward pressure of the rod 156 swings the brake lever 161 away from the rim 166 somewhat before the frictional surfaces are brought firmly together. A reverse action of the rod 156 of course causes the frictional surfaces to separate prior to the effective operation of the brake. lever 161against the rim 1%. lhus.wlien the treadle is pushed down and the outer end of the lever 139 is shifted downwardly, the pulleys 1 15 and 1319 will he clutched together thereby causing the transmitter to impart movement to the belt 23 in the direction of the arrows shown in Fig. 1, so as to rotate the clutch wheel 93. This operation will take place prior to any actuation of the stop lever 118 by virtue of the fact that during the initial downward movement of rod 13 1 the screw 132. rides in the groove or flat surface 133. Upon a further downward movement of the foot treadie and the rod 156 connected therewith, the push and pull rod 131-137 will be shifted downwardly to aposition where the shoulder 135 will strike the screw 1 34 and swing the lever 118 downwardly on the pivots 119 thereby shifting the stop finger 122 out of engagement with the clutch tooth 103. Siinultaneous'ly with this movement the roller 115, which is normally at rest above and out of contact with the brake lifting lever 111, is shifted into engagement with the corner 115 ofthe lever, thereby swinging the lever on the stud screw 112', lifting the pressure plug 107 slightly against the tension of the spring 106, and releasing the friction of the brake shoe on the sleeve 90-. This operation permits the spring 87 which is under tension to rock the sleeve 90 relatively to the shaft 71, thereby shifting the. balls 91 into aclutching position, at which time the crank shaft is caused to rotate to start the machine.

Tire (Zriac sir-aft mechanism continued;

It has been found in practice that where, as in the present case, the machine is controlled from the treadle 159 by the operators foot, and where the brake or pressure plug lifting lever 11.1 and stop lever 118 are constructed substantially as in my aforesaid Patent #1,3'52,383, breakage of certain of the parts, particularly the lifting lever, often occurs due to the accidental shifting of the stop lever too far downwarch-such being ordinarily impossible when the same is mechanically and automatically controlled. Therefore in order toavoid such disadvantages, the lifting lever 111 in the present instance is provided with the segmental por tion 113 concentric with the plane of movement of the roller 115 about the pivotal axis of the stop lever. The stop lever is furthermore operated by the rod 134 intermediate the stop finger and the fulcrum 114 (Fig. 38) thereby facilitating a positive operation the roller 1.15 will merely travel overthecurved surface 1.13 thus maintaining the lcver 11.1 .111 a constant position without any further swinging movement thereof.

[he speed regulator smu slowed.

From the foregoing it will be understood that the speed regulator 171 not only provides a means for chntrolling the" speed at which the machine is operated, but also, under one adjustment provides a means whereby the stop finger 12 may be brought out of engagement with the stop tooth 103 before the clutch wheel 93 is caused to rotat'e, or before the clutch wheel attains its maximum speed. Under another adjustment the clutch wheel may be caused to 1'0 tate at high speed before the stop linger 122 is brought out of engagement with the stop tooth103. In such case the machine will start instantly at maximum speed, whereas under the other adjustments the machine will start gradually at varying speeds until it reaches the maximum speed. Thus it will be seen that 1 have provided a means for varying the speed of tl'iemachine from the minimum to the maximum for controlling the speed at which the macl'iin'e is started and stopped and for starting and stopping instantaneously at any speed Without shock.

Although the power transmitter herein shown and described in coni'iection" with the present improved machine is a desirable pre ferred operating instrm'nentalit'y', it is of course understood that any other transmis si'onmay be used without departing from the spirit of the invention, or if desire'd under the particular circumstances the clutch wheel may he operated direct from a line shaft. In that casethe clutch wheel will be in constant operation and the machine when started will always operate at a predetermined speed.

The resser foot and thread, pull-0f operatin'g' mechanism.

Referring particularly toFigs. 1, 3, 35, 36, and 13 the construction is such that the reverse action of the foot treadle is utilized To a'ccomslotted to straddle the presser bar 183, the

projecting portions 184: being preferably rounded to co-act with the under surface of a presser bar guide 185 secured to the presser bar 183.

The guide has an extension 186 which fits I into the slotted end 182 of the lever thereby preventing transverse movement of the same. The presser bar reciprocates vertically in a bushing 187 carried by the bearing 33 of the machine frame, and the presser foot 188 is secured to the bottom of the presser bar. A presser spring 189 is provided with its free end 190 resting on the presser bar guide 185, and its other end resting on the pin 191. Pressure is given to the spring intermediate its ends by an adjusting screw 192, Fig. 1, tapped into a lug 193 of the over hanging arm 32. Adjacent to the end 179 of the presser lifting lever 180 is a latch hook 194 rockably connected to the lever by a knurled headed shoulder screw 195. The lower end of the latch terminates in an ear 196 to which is attached one end of a coiled spring 197, the other end being attached at 198 to a washer clamped underneath a shoulder screw 199, and held against the face of the arm 32. The position of the spring is such as to hold the edge 200 of the latch in contact with the pin 191 as indicated in dotted lines in Fig. 35. The latch is also provided with a shoulder 201 adapted to coact with a thread pull-off lever 205. The top of the latch is rounded out at 202 for engagement with a pin 203, thereby to nor mally hold the presser foot lifting lever 180 and the presser foot and the parts connected with it in the dotted line position, shown in Figs. 35 and 36.

WVhen the presser foot is lifted by the foot treadle, the levers 17a and 180, and the presser bar and presserfoot shift to the dotted line position shown in Fig. 35, and tend to return to the full lineposition in Fig. 35 under the action of the presser spring 189. Co-acting with the shoulder 201 is a bent right angle portion 201 formed as a part of the thread pull-01f lever 205 pivotally secured to the arm 32 by the shoulder screw 199. The free end of this lever terminates in a flared end 206 having thread eyes to receive the needle threads, and adjacent thereto are guiding strips 207, one on each side of the lever, extendin upward and one overhanging the other at t 18 top to guide the free end of the lever 205. WVhen the latter is actuated by the latch hook 194, and shifted to the dotted line position, slack thread is pulled off each time the presser foot is lifted.

The operation of the thread pull-off mechanism is as follows: The latch 191 car ried by the lever 180 is moved downward when the presser foot is lifted, and the shoulder 201 is brought into engagement with the bent end 204 of the thread pull-oil lever 205 and causes it to swing on the pivot 199 to the dotted line position shown in Fig. 85. WVhen the lever 205 has reached the dotted line position, the curved face 200 of the latch 191 is brought into engagement with the pin 191 which swings the latch rearwardly on the lever 180 thereby disengaging the shoulder 201 from the bent end 201 of the lever, whereupon the lever 205 is released and returns to the full line position shown in Fig. 35. Thus the mechanism is such that upon reversing the treadle 159 sufficiently the presser foot will be elevated and at the same time the slack thread will be pulled off.

The feeding mechanism,

Referring particularly to Figs. 12, 13, 1 1, and 15 a four motion feeding mechanism co-acting with the presser foot is provided for feeding'the work through the machine. This feeding mechanism embodies self locking adjusting means for regulating the length of stitch or the throw of the feed dog, such regulation being accomplished by an adjusting instrument, preferably as herein shown in the form of a key-wrench, thereby to prevent unauthorized persons from changing the length of stitch. Such adjusting means may preferably be so constructed as to be manipulated only by a special instrun'ient, thus rendering it a simple matter to change the length of stitch merely by turning the adjusting means one way or theother to the desired position, as indicated'by a gauge registering the length of stitch required.

The feed mechanism comprises a feed dog 208 which may be of any preferred form to suit the character of work. The shank 209 of the feed dog is slotted at 210 to receive a forward attaching screw, and also has an open ended slot 211 to receive the rear attat-hing screw. The attaching screws are tapped into the forward end 212 of the feed bar generally indicated at 213. The bottom surface of the feed dog is cut away at an angle at each side of'the center line 214, to give free space at 215 and 216 to permit the feed dog to be tilted so that the toe of the feed dog will engage the work in advance of the heel, or vice versa, or to permit the feed to be leveled. These adjustments are obtained by adjusting the attaching screws as desired, as for instance, if the screw 21'? is loosened and thescrew 218 is tightened, the toe of the feed will be tilted upward. this adjustment is reversed the toe will be tiltet downward, and the heel will engage the work .h'rst. By virtue of may either be gathered or stretched, or feed out smoothly without either gathering or stretching. Furthermore after a predetered adjustment of the feed has been made,

feed it v be removed at any time without destro 'ing or disturbing such adjust ment by m the forward screw the rear screw 218, nd withdrawing the feed dog 208 from the machine. The some may thereafter be re-. placed and at the same time maintaining such pred'termined adjustment; because the rear open slot 211 of the feed dog perm-its the removal thereof without disturbing the screw 218.

The feed bar 2L3 is rockably supported in the cyiinder 12' by a swinging'yoke link 220 embracing the her andsupported by e-stud screw 2th. The yoke is connected to the feed bar by belt 221 havingr a' shoulder 22 operating in one side of the link, while a nut 223 l121v'l1lg a Seoul-deli 9- operates in the tpposite side of the link n20.

The feed bar is bored to receivean eccentric bushing 225 which is clampedbet-ween the inside facesot' the yoke link by the bolt i which is screwthrended at 226 to rethe thread portion 227 of the bolt. 1 228 of the bolt tits freely into ion of the eccentric bushing. of the bolt and the clamp the bush- .e:nrely to the bolt and tothe side cfthelink-220, permitting the feed bar "1 in rock on the eccentric bushing- It ill be seen that the construction is such the; the height of the feed dog may be relative ing; the eccentric 225. The cylinder 2 is provided with apertures wuii through w ,1 d i ers cn and the nut ich ma be inserted screw 1 the heads of the bolt 222i 1 1d by loosening the nut and turning the colt the ecce 'lCW i tnrned with it so 21S to raise or lowtr the feed dog; to the desired height. The adj nt is d by holding the bolt with one are translather. FOHT-iHOiIiOiI movements nil crank b9 .iitted to the feed her by the b t the crank shaft opcretirigv in f the feed lot 231. 'i-he rear end '5 inc feed ba is connected to the cod i-ev r 231 by me of a jointpin 233 i the feed lQv er 25.31. ihe feed lever etc 253% secured thereto which forms l of a slidew; in whi h operates a lock 235. j. s slide block is sup ported i and rocks on a stud. screw 2% i adjustment the work adjusted to the throat plate merelyby turn- 22-9 in each side and ighteniug the nut with the bearing arried by arms 23'? and 238 of an adjusting yoke L39 ndjustably mounted on a vertical po 210 secured 1n the machine frame at 2 Y andi The post 240 is preferably tubular and thelower end is provided'with 'ened tude none .243 secured in the ofthe rear end 232 of the feed barnand preventing lateral movement thereof. The forward end of the feed bar 2i is guidec ngainst iateral movement by the side walls 2&6 of e slot 2%? formed in the end bearing 2-i-S.

and projecting downward The adjusting yoke 239 is slotted'at 2&9 V

to receive a key nut 250 provided with a flange 251 secured to the yoke by screws The inner portion of the key nut is screw threaded to en 'e 'e the left hand threads 254 on the lower end of e vertical screw 255 the upper endofwhich is provided with right hand threads 256 engaging corresponding threads in thepost as at Thenpper end of the screw 255 is proled with a flattened key 258 to receive a key wrench 260for turning the screw, the upper end of the post being bored at 2-59 toreceive the wrench, and also bored to alarge; diameter than thescrew below the threaded portion 257 In operation therefore in order to adjust the length of stitch or throw of the l'eed' dog, it is inerely necessary to insert the. keywrench 260 into the post untilthe notch 2'61 engages the key and then turn the screw in the desired direction either to shift the adjusting yoke 239 up or down on the post, thereby lengthening or shortei'ring the throw of the feed dog. Turning. the screw to shift the yoke 239 and slide block 235 upward increases the em'pli tude of movement of the feed lever 231 therebyimperting increased movement to the feed bar 213 and to the feed dog- 208 rrdjustinent in the opposite direction de creases the longitudinal movement of the feed dog dueto the fact't-hat as the slide biock 235 is moved downwardly in the guideway an increasingly restricted lateral movement is imparted to the feed bar 213 by the feed lever 231 operating on the adjustable fulcrum formedby the rocking siide biock 235. An adjust-able collar is moimted on the post 255-above the yoke 23! to limit the upward movement'o'f the oke when adjusted at the proper point. The machine casting is provided with a projecting portion 263 againstrwhich the yoke may engage, thereby limiting the downward movement thereof. From this construction therefore it will be seen that the necessity of' any locking means is obviatedfas the adjustment cannot change of itself. The steps 262 and 263 limit the feed tiOg-JDOVGHIBHiD in order to prevent it from striking either end of the feed slots