US1299468A - Rotary-hook sewing mechanism. - Google Patents

Description

B. K. HOHMANN.

ROTARY HOOK SEWiN G MECHANISM. APPLlCATlON FILED DEC. I4, 1916.

Patentefi Apr. 8,1919.

4 SHEETS-SHEET l.

R. K. H-OHMANN'.

ROTARY HOOK SEWING MECHANISMU APPLICATION FILED 05c. 14.. me.

4 SHEETSSHEET 2.

RuK, HOHMANN. ROTARY HOOK SEWING MECHANISM. I

APPLICATlON FILED DEC. 14 1916.

1,299,468. 7 Patenfed Apr. 8, 1919.

I I 4 SHEETS SHEET 3-. v I

R. K. HGHMANN. .ROTARY HOOK SEWING MECHANISM.

APPLKIATION FILED DEC-l Patented Apr. 8,1919.

4 SHEETS-SHEET 4.

m can RICHARD K. HOHMANN, OF SIOUX CITY, IOWA ROTARY-Hook SEWING MECHANISM.

Application filed December 1'4,-191 'l Serial No. 136,986.

To all whom it may concern Be it known that I, RICHARD K. H0 H' n.xxx. a citizen of the United States,'res1ding at .Sioux City, \Voodburv county, State of Iowa, have invented certain newand useful Improvements in Rotarv-Hook Sewing Mechanism,

specification. Iv

This invention relates to rotary hook sewing mechanism and particularly to such a mechanism adapted to rotate toward the operator or front of the machine with a high angular velocity. The objects of the invention' are to provide a sewing mechanism of this type so constructed and arranged that it will accommodate a large bobbin carrying a greater length ofthread than heretofore possible; to provide means to deliver the. bobbin thread at the right of the needle as viewed from the front of the machine; to provide means whereby the thread loop as it is drawn through the needle opening and into the cloth does not makea sharp bend at the edge of the opening, thereby permitting the use ofa weaker, tension in connection with the "take up; toprovide means'to cooperate .with an inclined front wall on the race having a bobbin eccentrically arranged therein to aidin leading the outer limb of the thread loop onto the front surface otthe bobbin casing and race. thus making it possible to make the rotary hook and race of minimum diameter: to provide a novel means for preventing the bobbin casing from turning relative to the race or carrier; and to construct the parts so that the thread loop will slide over the surfaces thereof with a minimum of IOSlSl'tlIK G. thereby permitting high sewing speeds. Other objects will be apparent from the description taken in connection with the drawings, in which,

Figurel is a rear elevation of an assembled loop taker, carrier and bobbin and showing the parts in the positions they occupy as the beak of the rotary loop take-r selzmg the thread loop from the needle;

F 1g. 2 is a side elevation of the assembled .device in the position shown by Fig. l:

. I Fi 3 is a side elevation and showin the p t P i position of the parts after the looptaker' has rotated through an angle of a little more Fig. 4 isa side elevation showing the thread and device in the positions which they of which the following is a taker; v 4

Fig. 7 is a sectional view of the loop taker I carrier power driven sewing machines as through approximately 5 of a turn from the \loop seizing position shown invFig. 1;

Ifl'ig. 5 's a front elevation of the device shqt'ving the threadloop as it is being withdrawn from the projecting finger of the bobbiii casing; 4

ig. 6 is a perspective viewof the'loop taken substantially on a diametral plane including the line 77 of'Fig. 6;

Fig. 8 is a side elevation of the loop taker; Fig. 9 is a sectional view of the looptaker taken substantially on a diametral plane in-I eluding theline 9-9 of Fig. 6;

carrier. with the bobbin casmg mounted therein; e 1 Fig. 11 is a rear elevationofthe race or carrier with the bobbin casing mounted therein; Fig. 12 is a side elevation of the race or carrier with the bobbin casing mounted therein; I Fig. 13 is a plan view of the bobbin casing; i

1g. 14 1s a rear elevation carrier; t a

Fig. 15 is a side elevation of the race or carrier; Fig. 16 is a sectipnal' view of the race or carrier taken substantially on the line 1616 ofFig. 15;

Fig. 17 is a top plan view of the, race or of the race or F ig. 18 is a sectional view of the assembled device and showing the spider or'ring for mounting the same on the hook shaft of the sewing machine. One of the principal defects of high speed coni Specification of Lletters latenit. v Patented Apr 8, 19519 Fig. 1-0'is a top plan view of therace or so i structed at present consists in the limitation of the size of the bobbin and consequentlyof the supply of thread which said machines will accommodate. The bobbin is so; small;

and especially so in machines having the hook rotating toward the operaton'that itmust be replaced at very frequent intervals with ,a-conse'quent. loss of time and production of the machine.- It is the principal 0b- 106- ject of this invention to provide a sewing constructed with the greatest care inorder' to operate successfully. Because ofthe increased slze of the thread loop a larger amount of-thread is drawn through the eye of the needle and later must be pulled up by the take-up. Consequently the take-up mustbe designed to'give a larger amount of motion to the thread and the surfaces over which the thread loop is cast must be designed so that there will be no placewhere the thread will catch, or dirt, oil, lint or other things collect, to th reby produce friction as the thread is drawn over them. If

the bobbin is made longer in order to increase the quantity of thread itwill carry,

the inclined edge of the beak or other means for casting one limb of the thread loop toward the rear of the bobbin must be so long that in theshort time v taken for the rotation of that hook from its top to its bottom position, or 180, the thread will not have passed to the rear of the bobbin casing when the hook has reached said lower position, with the result that the thread will be caught betw n the hook and carrier, thus producsnarl. On the other hand. if the diameter of thebobbin is increased in order to carry a larger amount of thread the pe-' ripheral speed of the hook will be correspondingly increased so that the loop seiz ing beak will strike the thread loop at the needle with considerablesigviolence and the. great acceleration placed on the thread at that instant will produce considerable tension therein with a liability of breakage; By judiciously. increasing both of these dimensions, that is, the length; and'diameter, and constructing the parts of-the mechanism to properly coiiperatewith the increased size of the bobbin, a rotaryhook mechanism of; the typerotating toward the operatormaylbe produced which can be operated ,at a rate of 3,000 or 4.000 stitches per minute and yet carry a bobbin having several times as .much machine heretofore used.

As clearly shown in the drawings, the

mechanism comprises a looptaker, a carrier or meim-nmtdd therein anda flilfiltl Ol bob )in may carried by the cai'ricif Figsptito 0. inclusire, which show theloop taker, it will be noted that it consists of a cyliinlrical ring 20 provided at-"the rear end thcrcofuith apertures 21 'for conn .ction to a riwr 74. whereby it may be rota- L111 any case if the v vided I such as by means of the thread thereon as any p I v spect to the inclined edge 24 of. the beak 25 Referringto tably attached to the hook shaft of the sewing machinel' Of course, any other suitable means might be'used'fonmounting the said loop taker on the hook shaft. Wherever possible the ringis formed with apertures such as 22' for the purpose of reducing the weight thereof and distributing the weight so thatthe loop taker will be in dynamic balance. At the front'cndthereof the ring is formed with a notch .23 extending about half way axially toward the rear end. One of the walls of this notch is inclined as at 24: whereby the meeting of the same with the front wall of the ring forms a pointed beak 25. This inclined wall 24 is for the purpose of carrying one limb of the thread loop toward the rear of the bobbin casing. As means 15 provided on the carrier for guiding [entire distance to the rear ofthe bobbin casthe said limb the remaining distancetoward ing. At the edge of the notch 23 opposite the inclined wall 24: a blunt circumferentially extending projection or nose 20 is profora purpose Which will be described The interior of the ring at the front later.

end thereof is formed with an inwardly extending radial flange 27 which cooperates with the carrier to hold the latter in position in the loop taker. As clearly shown in the gures, especially Fig. 8, this flange does not extend entirely around the circumference of the ring but is on'iitted at the notch 23" A. combined deflector andjrt'hread guiding member 29 is arranged 'to'efiteird 'circumfer entially across and over the 'notch 23 and partially around thering. As clearly shown in Fig. 8, this member extends varound the ring for substantially 270 and has its ends attached to the same in any suitable manner, 0 screws 30. It will be observed that the-portion of the member 29 wh'ch extends across the notch 23 has its front edge 31 or; the edge adjacent to the beak 25, spaced back slightly from the front edge of the ring, and that this forward edge of the member 29, as it approachesthe base of the beak 25, iscurv'ed toward the front edge of the ring. Thus, this curved portion 31 of the forward edge of'the member 29 is arranged at an opposite inclination with re- .edgeof the inclined surface 31 the memer 29 is formed with a lug or inwardly extending projection 32. which fits tightly in a reccssf33. formed in the ring 20. Thus it 1 u'illjbc apparent that this lug or projection 32 forms a throat betweenflthe deflector and the beak; Heretofore it has been the practice to form this throat by attaching one member 'to another and although the greatest (LC-r curacy were used a slight crack generally appeared between the members in which lint,

grease, and dirt would accumulate'and cause broken threads. It will be observed that by providing a lugon one of the men' bers'ex-v tending into a recess in the other, no cracks result and furthern'iore the thread passes over a very small surface of the lug and asthe surface is so very small itis obvious that it does not afford opportunity for the lodgment of dirt, grease, or other foreign Moreover, because of the simple cheaply and secured in position without the requlrement of a skilled workman. The remaining portion of the member '29 which extends from the base of the beak around I the ring for about 180 is provided with an inclined. flange or wall. 34 which extends axially outward from the front edge of the ring and is inclined inwardly toward the axis of the same. This wall is therefore part of the surface of a cone and may be designated as a partial "conical wall or an inclined front wall. The function of this wall 34 is to aid in guiding thefront limb of the thread loop onto the inclined front wall of. the race or carrier, as. will be more fully ex-- plained hereafter. This inclined wall 34 could be omitted from the ring, the member 29 extending across the notch 23 onl v,,vand

the device would operate successfully, but I prefer to employ the said wall, a'sjit permits scribed. Referring to Figs. 10, 11,12 and 14 to 17, inclusive, itwill be observed that this carrier or race comprises-a castnghaving a bearing rim 35 which, near the top of the carrier, is formed with a hook 36 facing or pointing toward the top. Opposite this hook-the bearing rim is formed, with a nose or blunt hook 37 The periphery of 'the sition the thread or bobbin case. As clearly shown in Figs. 12 and 15, the axis of this pin. is located eccentrically with; respect to the axis of the bearing rim 35, that is, it is located below and to the sideopposite the hook 36With respect to the axis of the-bear. ing rim.

rim it will be observed that th 1 of the connecting 3,211 40 ya 7 Because the center of the rear Wall 39 1s eccentrlc with respect to the bearing vtio'nof the inclined wall 40 is more nearly vertical than the right hand portionshown in these figures. and the bobbin casing is mounted eccent-rically in the carrier forthis very purpose, as will be explained later. This inclinedwall 40 is formed with an aperture 41 extending between the hooks 36 and 37 and to the rear circular wall 39' and the edge ofithis aperture ad'jacent thehook 36 is forme'diso that it constitutes a surface Hush and tangent to the hook, whereby the limb of the thread loopcaught by the hook 36 will be guided by the said smooth edge to f the rear of the carrier. As illustrated in Figs. 10, 11 and 18, the bobbin casing projccts forwardly of the bearing rim 35 and inorderto guide the front limb of the thread loop onto-the front. surface of the bobbin casing an inclined front wall 42, similar .to the rear wall 40, is provided and extends from the bearing rim to the front of the bobbin case. It should be noted,-however, that this wall is not continuous entirely around the bobbin case but merely extends 0 from adjacent the hook 36 to the bottom of -the bobbin casing, as viewed in Figs. 12 and- 15. At the top and front of thecarrier this,

wall 42 is constructed to extend vertically upward to form two spaced apart shoulders 43' and 44, this portion being connected to the bearing rim adjacent the hook 37 by means of a web 45. The shoulders 43 and 44 are provided to looselyreceivetherebetween a lug 46 on a stationary member-47100 (Figs. 1 and 2), whereby. the carrier is prevented from rotating with the loop taker.

Just below .this lug 46 the front faces of the shoulders are formed with, a concavedepression 48 for the purpose of guiding the thread under the saidlug 46.' The outer edge of the front inclined wall 42 is not joined di: rectly to thebe'aring rim 35 but'is spaced therefrom, thereby forming a groove. 52. As

fully explainedin'my PatentNo. 1,105,197;

granted July 28, 1914, it is necessary to have the walls 40 and 42, shown especially in Figs. 16v and 17, or the walls at theright hand'side of the bobbin case, as viewed'in these figures, steeper with respect to the verfltical than those at the left hand side. This is required because the thread loop is being drawn downward over said surfaces by the loop taker and, if the walls were not sufficientlyinclined toward the axis, the limbs of the thread loop would notbe carried toward the rear and front, respectively, of the bobbmcase; On the other hand, as the loop when it reaches, the left hand side of the I F pulled upward'by means of the"take;up, it is obvious that as both structure is bein limbs of the loop'have been moved to the end and ffon't surfacesgpractically no inclination of the side .wallsdsf required. Conseweb-y wh w clination of the sidewalls yet the maximum the required in-. is obtained and .diaineter of the casing is permitted. Furthermore, by locating the axis of the bobbin case below, instead of on the same horizontal plane with the axis of ,trically within the carrier,

the bearing rim of the carrier, the'ntire bobbin casing is located lower downiin the and the said carrier and consequently no part of't'he same is in the path of movement of the needle;

By forming the carrier with the groove same would have to be increased. Thus by forward end of the post forming, the loop taker with the inclined projecting front wall at the base ofthe' loop' seizing beak so that the front, limb of the thread loop is moved forward thereby and guided onto the inclined front wall 42 of the earring-the diameters and loop taker are kept at a minimum. The 51 is formed with a groove 53 which is adapted to cooperate with a latch 5-1 carried by the bobbin casing to hold thesame in Any other suitable means might be usedfor.

I reta ning the bobbin casing in position with-V v web" projects axially from the bearing rim only a slight e'mountto form the said shoulf end carries the latch i on the outer surface t tension member 67,

1 formed on the arc-of a v ture- 61 as the center-"thereof; In bobbin cas- 1n the carrier. The web the bearing rim 35 andendsin an inclined T hisextended portion of the der which cooperates with the bobbin casing for a purpose presently to be described.

Referring particularly to Fig; 13, the bobbin .casing comprises a cylindrical-shell 561 which is open at its rear end and at its front v means 54. This shell-.-

5 adapted to receive the bobbin 57 havin the thread 58 arranged thereon. The thread throu'gh the slot'60 aperture 61 in the surface of the'shell and outward through the tothe notch 62 then substantial] vertically upward to the aperture 63-int1e end of the curved upwardly carried on the front jof; the bobbin casing.

his aperture 63 formsfone end of a short,

finger. From this joutl'et thest-hread is led to the needleapertii're ()(Sbf the i iember 167. Theslot '59 is curved and has thesedge 68 circle with, the aperingsas heretofore useclthe edge (i8 has been straight and in consequence thereof when the groove were done away withstrut-ted so that no of both the carrier position in the carrier.

45. is 'continued for t spectto the carrier. a slight d stance circumferentlallyaround) several .of the figures. it

front or 'operators -side 0f the machine. g Ehoolef i-otating toward the operator if the y fbeak 'of the hook it from the bobbin 13 adapted to be led through: an aperture 59, t-hence'lfo r a .short'distancesw of the shell, theninwarclm shell, thence .along the i in the;

projecting finger am the firsttojn I I the bobbin thread n [conduit 65 having an outletin the end of the 1 the bobbin except thecentral part'there is a component of force due; to the pull in the thread tendingto cariysaid thread to the central part of the said straight edge. It will be obvious that by with the curved edge 68 there 1snocomponent tending to carry the thread to one side or the other. Thus, even if the thread is be ing withdrawn from the bobbin at the very ends thereof it will pass strai ht line from the bobbin to the aperture 61. hethrcad ma be carried into the slot 59iby inserting it t rough the obliquely arranged slit 69 which. extends from the end of the shell to the,

thread is beingdrawn from any hortion of 1 forming the slot in substantially a said slot. Likewise the inserting the same through theslitftrwhich connects the said a erture 61. Withthe'reary ,1

fiecause the front limb of least across the frontbf 1 this front must be con flj 1 projections or rough suredge of the shell. the thread' loop is the bobbin casing,

faces are presented to hinder th passage of the thread thereacross. Aspreviously stat-ed, the shell is formed at portion thereof with an upstanding" finger, 64 which, as viewed in slightly to the right of the the left hand edge'thereof may engage, with the shoulder to thereby prevent movement in one direction of the bobbin casing with re- As clearly shown in will be observed that this finger not only extends upward but is arranged so that it projects toward thebearing rim of the carrienwhercby the end there -0 is located to the right hand side of the needle whelrthedevice is viewed from the thereof. Thus, as the thread is delivered from the end ofthis finger, it will be guided to the. righthand side bf the needle. as viewed frointhe 'front a plane to the ivered onthe opposite side of=the needle s stitch'having u'knot insteadrof a twistwill; be roducer 'Howfeit'er; if the bobbin thread :is delivered at the right; hzind side ofrthe needle; aprope;r stitch willfbeformed' Coir sequen-tly the 'ineans' for delivering the thread f in this-:i'nuuner is veryimportant feature of this invention 'As ,far "as I amia'ware, I

rection described;

i this relation, the "fi'om left to right,

Hence; by providing means for delivering the bobbin thread at the right. hand. side of the needle, it is posthe top of the front Fig. 12, is inclined I vertical so tha In machines :having the and theb obbin thread is, v

de eans for delivering this manner in a rotarv iook sewing niechanisn'i rotating in the di-.

Itv will The further ob served: that because of needle may be threaded as viewed from'the Homer the operators side ofthe machine.

sible' to" form a threaded from le of'having a needle threaded from left to stitch with a needle t 'toright. The advantage right are well known in the art and the utilityof thi provision for delivering the bobbin thread at the right of the needle will therefore bejapparent. The side of the'shell 'curely held jacent the shoulders 71 the shell isfo'rmed 'in the race.

adjacent the shoulder on the race is formed with a-projection or shoulder 71, which is adapted to cooperate with the shoulder 55 to prevent movement of the casing relative to the race. It will thus be apparent that the shoulders 55 and 71 revent movement of said casing in one direction and that the finger 64, abutting against the shoulder 44, prevents movement in theother direction and hence thebobbincasing is goagainst rotation in the race. Ad-

withanother projection or shoulder 72. In inserting the bobbin casing in the race, it is necessary to place it therein with the finger 64 substantially horizontal, their-the casing is rotated to bring the finger in contact with the shoulder 44, whereby the bobbin casing is pushed farther inward to bring the shoulders 55 and 7l.into engagement. The shoulder/Z2 is provided for the 'purposb 'of preventing the bobbin casing from moving axially inward too far when'iit is first placed in the casing with the finger64 horizontal. It will be apparent that as the opening in the race for the bobbin casing is eccentric, at

the top of the race and immediately below the shoulders 43 and 44, there is a slight space between the casing and the web 45.

Gonsequently if the shoulder 72 were not provided the bobbin casing could move inward to its full extent and, upon rotation of the same to bring the finger 64in contact with the shoulder 44, the casing would bind the shoulder 7 2 is to act asa stop or Safety device to prevent the casing from being incorrectly inserted in the race.

It will be observed that the inclined front 7 wall 34 of the hook ring has particular utilshaped so that the whole device may be 10-,

ity in combination with the inclined front wall 42 of the race, inasmuch as the wall 34 delivers or guides the upper thread onto the frontwall of the race. If the inclined front wall 34 wereniade cylindrical insteadiof conical, it is apparent that the finger 64 would be much longer and of different shape and project laterally in a different manner. However, because of this conical wall 34, the diameter of the hook ring is maintained at a minimum and the finger 64 may be cated .verv close to the needle plate 167.

Hence there is more or less of an intimate relation between all these parts of the device. Furthermore, it will be observed from Figs.

4 and 5, especially, that the finger 64 acts as a very efiicient guide for the upper thread Consequently the function of loop when it is being drawn upward take-up, thus preventing twists arid snarls in the same.

Referring to Figs. 3 to 5,'inclusive, will be observed that the bobbin thread passes from the end of the finger 64 upwardly and in an inclined direction through the needle aperture 66. In previous constructions of rotary hook mechanisms the bobbin: thread has been delivered from the bobbin at the left of the vertical and guided to the needle ape'r ture so that it is bent around the left hand edge of the a erture, as viewed in these figures. It will e observed in this mechanism, however, that the said bobbinthread passes in almost a straight line from the end of the finger 64 through the needle aperture to the cloth, the right hand lower edge of the needle aperture being slightly beveled as at 73 for this purpose. Referring to Fig. 5, it is apparent that as the thread loo is drawn u from the position there shown into the clot; to form the stitch, the bobbin thread between the end of the finger 64-and the cloth forms substantially afstraightguide for the loop and offers practically no resistance to its passage therealong. In the other types of mechanisms in which the bobbin thread is delivcred from the bobbin at the left of the vertical and drawn around the left hand edge of the needle aperture, it is obvious that the thread loop must be drawn along the curved path of said bobbin thread and that there is more or less binding when the said loop passes between the, edge of the needle aperture and th bobbin thread. Considerable tension in the machine is required in order to pull the loop along at this portion of its moven'ient. Furthermore, because of the 05 bend in the bobbin thread and pullof the loopat an angleto the said thread, it is obvious that there is considerable liability of brealiingthebobbinthread. With the-device herein disclosed, however. as the loop is guided along the substantially straight bobbin thread, there is practically no resistance V i Fig. 3 shows the pos tions of the parts after the loop takerhas r tated through .a little more than 90. It will be observed that the inclined front wall ,34 has guided the front limbQof the loop onto theinclinedfront wall .42 of'the race. Of course, this inclined wall 34 could be omitted from the rotary hook and the'front wall 42 of the race further inbeginning to seize the loop from the needle.

passes by the hook 'ture is independent clined so as to perform the function of guiding the front limb of the loop onto the front surface of the bobbin'casing. However, if

this wall 42 alone were depended uponyit would be necessary to incline it a little more than shown 111 the drawings, thus requiring a somewhat larger diameter speed thereof and the violence with which the beak would seize the loop from the needle, the advantages of keeping down the said ,diametereven by a very small amount are obvious. lhe rotarv h'o-uk continues to 1'0- tate in a clockwise direction from the "position shown in Fig. 3 until the front limb of the thread loop has been guided onto the front of the lobbin casing. Then the takeup begins to operate and pull up on the. thread loop. If this loop is pulled up too rapidly itwill catch on the nose :26 of the loop taker, this nose thus performing the function of preventing snarls or unnecessary twists in the loop. fWhen this nose 26 or nose 37 on the race, the loop will. be released from the notch formed between the hooks 36 and 37 and will be drawn into the position illustrated in-Fig. 4, where it extends around the'shoulders lS-Q 44 and the finger 64. The continued move- I mentof/the take-up will pullthe loop from.

the shoulders 43, 44, along the curved: finger 64 to the position illustrated in Figs 5. Thus, it will be'apparcnt that this curved finger guides andkeeps distended the loop, thereby preventing twists or tangles. Fur thermore, as 'cxplained previously, the loop is guided onto the bobbin thread so thatit may be pulled therealong with the minimum of friction and in a path. WVhen the loop is drawn from the substantially straight shoulders 43, 44, that is, from the position of Fig.4 into the position of Fig. 5, it will be observed that the depressions 48 in the shoulders act to guide the thread loopunder the projection 46, on the stationary member 47.. Although the inclined front wall on the rotaryhook is shownand described inc-connection with a hook mechanism rotating toward the operator, it 1s obvious that it is equally well adapted for use in hook mechamsms revolving away from the operator; also that the feature of the invention which consists in delivering the bobbin thread.

through the needle aperture without making a sharp bend around the edge of the aperof the tion of the hook mechanism. H

Having thus described the invention, what is claimed and desired tob'e secured by Letters Patent is: a

'1. In combinatifin with a reciprocating needle adapted to e threaded fromthe operatorsi-left to right,.a rotary hook revolvfor the rotary' 1 hook. As theincreased' diameter of the rtary hook would increase the peripheral direction of rotaing toward the operator,-a bobbin and means for delivering the bobbin thread at theright of the needle. i r

2. In a stitching mechanism, a rotary hook,"a carrier mounted therein, a bobbin casing in the carrier, said carrier having an inclined front wall to guide the front limb of the thread loop upon. the front sur face of the bobbin hook having a beak and an inclined front wall arranged circumferentially in rear of the beak and casing and said rotary a pro ecting axially to cooperate with the first mentioned wall in guiding the I thread.

3. A rotaryhook for stitch forming mechanism comprising a ring having a beak and an axially projecting wall inclined toward the axis arranged circumferentially in rear of the beak and extending around-a portion only of the ring.

.4. A rotary hook for stitchforming mechanism comprising a. ring having a notch formed therein with a beak at one :edge thereof, a member extending over the notch and circumferentially in rear of the beak for a portion of itscircumference, one edge of the member in front of the beak. constructed to constitute a thread deflector and inrear of the beak said. member having an axially projecting wall inclinedtoward the axis.

5. A rotary hook for stitchgforming mechanism comprising a ring havln'g a notch ormed therein with a beak at one edge thereof, a member extendingover the notch and circumferentially in reanijof the beak for a portion of its circumference,one=edge of the member in frontof the beak constructed to constitute a thread deflector and in rear of the beak said member having an axially projecting wall inclined toward the axis and at the baseof the beak said' rstiember and ring having a lug on one part 6. In a rotary hook sewing mechanism, a

bobbin casing arranged to deliver the bobbin thread at the operators right of the needle. v

In a' rotary. hook sewing mechanism.

rotatable about a horizontal axis, a bobbin casing,;meansfor holding said bobbin cas-' "right, of the needle.

9. In a rotary hook sewing mechanism, a

bobbin casing having a projecting finger arranged to deliver front, and at the operators right, of the needle. 3 I 10 In a sewing mechanism the' combinatting in a. "recess in the other to constitute a thrdat between the parts.

having a projecting finger,

thebobbin thread in j the same around the edges of the aperture,

sa d means including a finger carried by a having an aperture for the needle and threads, a rotary hook device having a bob- I bin casing therein, and means for delivering the bobbin thread through the aperture to the material being sewed without bending stationary part'of said device and extending to a point radially outside of the path of the hook, said point being on a substantially straight line passing through said aperture.

11. In a sewing mechanism, a rotary hook, a carrier therein having a projection at the top thereof, means cooperating with said.

projection to hold the carrier stationary, a bobbincasmg 1n sald carrier, and means for holding the casing against rotation, said means including a finger projecting radially outside of said carrier and engaging theside of said projection onthe carrier.

. 12. In a sewing mechanism, a rotary hook,

a carrier therein having a projection atthe top thereof, means cooperating with said projection to hold the carrier stationary a bobbin casing in said carrier, means ior' holding the casing against rotation, said means comprising a finger on the casing'engaging the side of said projection to prevent rotation in one direction, and cooperating.

shoulders on the carrier and casing to prevent rotation in the other direction. f

13. A rotary hook for stitch forming mechanism comprising a ring having a notch formed therein with a beak at one edge thereof, a member extending over the notch and circumferentiallyjn rear of the beak for a portion of its circumference, one edge of the member in front of the beak constructed to constitute a thread deflector and in rear of the beak said member having an axially projecting wall.

14. In a sewing mechanism, the combination of a reciprocating needle, a'needle plate having an aperture for the needle and threads, a rotary hook device having a bobbin therein, and means for delivering the bobbin thread above the device and in front of the needle whereby the said thread passes throu h the aperture insubstantially a straig t line.

15. A rotary hook sewing mechanism, including a non-rotative part, and a finger {carried by said part and formed to deliver the bobbin thread at the operators right of the needle. a

16. A rotary hook sewing mechanism ineluding a non-rotative part, and a curved finger carried by said part and projecting toa. point radially outside of the rotary hook and at the operators right of the needle and 'formed to deliver the bobbin thread at this point and to guide the upper thread loop onto the bobbin thread as it is drawn up to the fabric.

17. A rotary hooksewing mechani'sm-incarrier, a finger projectin from the casing arranged to deliver the b0 bin thread at the operators right of the nee lle and c06perat-.

rotatable in'a plane parallel to and atone side of the needle, a stationary carrier, a bobbin casing, and means for delivering the bobbin thread-at the same side of theneedle as the hook.

19. In a sewing mechanism, in combination, a'needle plate having an aperture for the needle, a rotary hook, a bobbin, and means for delivering the bobbin'thread at a point radially outside the path of the hook, said pointbeing on a substantially straight line passing throughthe said aperture.

20. A rotary hook sewing mechanism ineluding a rotary hook, a stationary carrier, a bobbin casing, and a finger carried by the casing for delivering the bobbin thread at eluding a bobbin casing and a stationary a point radially outside of the path of the" RICHARD K. HOHMANN.

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