US1049791A - Revolving-hook sewing-machine. - Google Patents

Description

V d. WINKEL. N REVOLVING HOOK SEWING MACHINE.

APPLICATION FILED DBO. 21, 1903. v ,7 I Patented Jan. 7, 1913. r

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0. WINKEL-. I REVOLVING HOOK SEWING MACHINE.

APPLICATION FILED DEG 21 1903.

Patented Jan.7, 1913.

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UL W'I'NKEL. REVQLYING HOOK szwnf MACHINE. A-PPLIMT'ION rILnnnno. 21, 1903. 1,049,791.

v outrun STATES PATENT OFFICE.

CHRISTOPHER WINKEL, OF BELVIDERE, ILLINOIS, ASSIGNOR TO NATIONAL SEWING MACHINE COMPANY, OF BELVIDERE, ILLINOIS, A CORPORATION OF ILLINOIS.

REVOLVING-HOOK SEWING-MACHINE.

Specification of Letters Patent.

Application filed December 21, 1903. Serial No. 185,976.

' Patented. Jan. 7,1913.

Toall whom it may concern Be it known that LCHms'rorHnR VVINKE'L,

a citizen of the United States, residing at.

Belvidere, in thecounty of'Boone and State of Illinois, have invented certain new and useful Improvements in Revolving-Hook Sewing-Machines, of which the following I is a full, clear, and exact specification.

' My invention relates to that class of sewing entangled with the hook mechanism 20' should the operator fail to arrange it properly when starting to sew or rotate the machine in the 'wrong direction. A serious and well'known objection to this forinof sewing machines is that. the hook produces a twist in the loop, -which often results inthe formation of knots or snarls when the take up actsto tighten the loop or the loop is drawn upward by any other means, This invention is designed to avoid this defect,

and it therefore has for its further object to untwist the loop before it is drawn up or tightened. In this form of machine, the lower thread, where it passes from the tension device of the bobbin to the passage in the throat plate, ordinarily extends at an oblique anglewhile under' the tension of the bobbin, and the loop of upper thread, in the act of being drawn up, has to force its way between the throat plate and thistaut lower thread, and this results in great friction on the upper thread, often causing it to break, and in any event making the stitching tight or loose according to the speed, and resulting in uneven sewing. v To overcome this defect, this invention has for one of its ob ects to unwind sufficient slack of the lower thread, before the loop is drawn up, to relieve the same of undue strain at such time, and hence avoid undue friction on the upper-thread. And this invention has for its object generally to combine all the advantages of both the revolving hook and the rotary shuttle forms of sewing machines withpractically all of their disadvantages and objectionable features eliminated.

VVit-h these ends in view, my invention consists in certain features of novelty in the construction, combination: and arrangement of pa-rtsby which the said objects and cer-- tain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawingsFigure 1 is a front elevation of a part of a sewing machine head provided with these improvements. Fig. 2 is a bottom view thereof. Figs. 3 to 9, inclusive, are details of the rotary hook,

the bobbin and the bobbin case, Fig. 3 being a cross section of the flange and crank plate which connects the shaft to the hook, Fig. 4 a cross section of the bearing ring, for the hook, Fig. 5 a. side or edge elevation of one part of the hook proper in which the bobbin case cavity is formed, Fig. ca side elevation of the bobbin case and its support with the parts separated, Fig. 7 a side or edge elevation of the cap which holds the bobbin case support in the hook cavity, Fig. 8 a front elevation of the member shown in Fig. 5,

and Fig. 9 a front elevation of the member shown on the left in Fig. 6. Fig. 10 is a top or plan view of the parts assembled, the sewing machine bed plate being removed. Fig. 11 is a front elevation of the parts shown in F igs. 3 to 7 assembled with the removable partof the bobbin case omitted, also showing the point of the hook in'the act of carrying the loop around the bobbin case. Fig. 12 is a similar view, showing the point of the hook still fa'rther advanced with the loop. Fig. 13 is a vertical cross section on the line l313,-Fig.' 12. Fig. 14: is a vertical section of all of the parts.- shown in Figs. 3 to 9, assembled and with the bobbin in place. Fig. 14 is an enlarged detail elevation, showing the arrangement of the thread with relation to the bobbin, and also thread seat or notch in the bobbin ca-se support. Fig. 18 is a vertical section of the construction illustrated in Fig. 17. Fig. 19

is'a View showing the point of the hookstill farther advanced and producing the twist in the loop, this view being taken from the side of the machine toward which the hook rotates, on the side opposite the operator.

from the start, showing how the finger untwists the loop.

- 1 is the bed plate of the sewing machine head, 2 the needle, 3' the throat plate through which the needle passes, and t the upper or needle thread, all of which may be of the usual or any suitable construction, the feed, which may be of any ordinary or desirable form, being omitted for the sake of clearness and as it constitutes no part of the present invention.

5 is the rotary shaft, which may be driven in any suitable way and mounted under the bed plate 1 in the usual or any suitable bearings, not necessary to illustrate, and contiguous to the end of this shaft is arranged a wall or plate 6, which extends downwardly from the under side of the bed plate 1 in a vertical plane, or a plane at right angles to the shaft 5, and to the end that it may be firmly secured and closely fitted to the under side of the bed plate it is provided with lugs 7 on each side through whichpass screws,

or other attaching devices, 8, threaded in,

bosses 9 on the under side of the bed plate 1. This plate 6 is in the form of a ring and its upper side is cut away on the chord of a circle where it meets and contacts'with the lower side of the throat plate 3, as better shown in Fig. 1, it beingextended upwardly between the opposite ends of the bosses 9 so as to fit accurately against the throat plate 3, and thereby constitute a complete wall or barrier to prevent the thread from being carried to its inner side and wound around or entangled with the shaft 5, or parts con nected therewith. The plate 6 is recessed in 'its outer face as more clearly shown in Fig.

is of greater diameter than the inner periphery of the ring 10, so that the ring 10 will constitute a flange projecting over the edge of this opening 11, as shown in Fig. 20, and within the ring 10 is arranged a journal 12 formed on the body portion 13 of the rotary hook, which will presently be described more in detail. The back of this body portion 13 fits accurately against the face of ring 10, while the end of the journal 12 comes flush, or substantially flush, with the inner face of the ring 10, and secured thereto is a ring 14 which overlaps the ring 10 and thereby constitutes a means of holding the journal 12 against movement in a direction lengthwise of its axis while permitting the journal 12 to revolve freely within its journal bearing constituted by the inner periphery of the ring 10. The body 13 of the hook may be thus revolved in its independent hearing by the aid of any suitable connection with the shaft 5; for example, the end of the shaft may-be provided with a slotted crank arm 15 in the slot of which engages a wrist 16 secured to the ring 14, or to any other connection on the body 13, so that as the shaft revolves the body of the hook will be rotated accordingly, but this peculiar form of connection will not be described in detail herein as it constitutes the subject-matter of a co-pending application, Serial No. 189,397, filed January 18th, 1904.

As more clearly illustrated in Fig. 5, the' body portion 13 of thehook is given the form of a truncated cone at its outer end, and the extreme smaller end of this truncated cone portion is formed with a projection 17 whose outer edge is parallel with the end of the cone and which is bounded at one end by an abrupt shoulder 18 and at the iother by a slot 19 whichextends .inwardly toward the base of the cone, so as to constitute the point 20 of the hook proper at one extremity of the projection 17 and the outer end of the slot 19, and the throat 21 at the inner end of said slot, the surface of the projection 17 constituting a continuation of the side of the truncated cone. The body portion 13 is formedwith a cavity 22 for the reception of a bobbin case support 23 and bobbin case proper, 24, and the surrounding wall of this cavity 22 in the outer edge thereof contiguous to the outer end of the truncated cone is rabbeted or formed with a groove 25 for the reception of an annular circumferential flange 26 formed on bobbin case support 23, thus giving the bobbin case a support and journal bearing within the body 13 of the hook and holding the case rigidly against lateral movement lengthwise of the axis of rotation of the hook in one direction. It is held against lateral movement in the opposite direction by an inwardly projecting annular flange 27 formed on the outer end of a cap 28, shown in detail in as the shoulder 18, so that the outer edge of the projection 17 which together'with point 2O constitutes the hook proper, will be'flush with 'the outer vertical surface of the flange 27, leaving no obstruction for the thread to r catch upon, but where the projection 17 oocurs the flange 27 is omitted or cut away and it does not begin again in thecircle until the'point 30 is reached, but the'inner edge or circumference-of the projection 17, 20 is" provided with a flange 31 which overlaps the flange 26 and constitutes a continuation of the flange 27, and between the slot 19 and the point 30 the edge'of the cap- 28"is cut away to form the needle clearance 32, and

' one end of this needle clearance is formed on an oblique shoulder 33 which extends inwardly from the shoulder 18 to the inner end of the slot 19 and from the inner end of the shoulder 33 the cut iscarried outwardly along the bottom edge of slot 19, as shown at 34,'so as to avoid covering the slot. :The

l shoulder 33 is roundedfor eased ofi' toward the surface of the hook proper, 17 20, as

better shown at 35, in Fig. 19, so .asto avoid the possibility of undue friction on abrasion of the inner strand 36 of the thread.

The cavity 22 in the, body of the hook is sufiiciently larger than the inner side'of the bobbin case support 23 to afiord ampleroom for. the passage" of the thread between said support and the body of the hook without danger of pinching. or abrading the thread.

or compelling the thread to force any of the parts aside to enforce its passage between them,-and the upper side ofthe flange 26 is cut away to form a notch or thread seat con.-

stituted by two shoulder 37,38, the former of'which at least is rounded to avoid abrading the thread, and between which shoulders the needle thread passes, as clearly shownin v Figs. 17, 19 and 20, and this loop which is caught by the hook proper, 17,20, is gradually forced into the throat 21am! carried downwardly in the manner indicated in Figs. .16, 1-7 and 19, andfo-rced over and around the bobbin case support 23, whose inner side ouhack is also tapered or of truncated cone shape to encourage the passage of the thread thereover, and by'thus continuing around the under side of the botbin case support while in the throat 21 it willbe'secn that it completely encompasses said support after being finally drawn up by the takeup, or other suitable means, without having. forced its passage by pushing any of the parts aside on coining into'abrasivecon tact with any'ofthe mechanism or lubricated surfaces.

The bobbin case'support 23 is held against able means, but preferably by means of a rotation with the hook 13, 17', by any suitcurved finger, which will now be described, h and which serves the twofold purpose of thus holding the-bobbin case support and of removing the twist from the loop, which is the inevitable result of passing the loop around the bobbin case. shown in the form of a curved horn which is, formed on the outer side of .bobbin case support- 23 near the top and conjoins with This finger. is

said member 23 by an easy curve or incline. 39, so as to avoid catching thethread, and

it thence curves inwardly to fornr a C- shap'ed finger 40, it being curved upwardly as well as inwardly from itsstarting point on the member 23, and the extremity of thisfinger 40,which is tapered, terminates contiguous to a passage 41 formed in the top of member 23 for the needle, this passage being located at the outer side of the flange 26 in a lip or overhang 42 on the top of the member 23, and which is eased ofi' gradually until it meets the main portion of said member 23 so as to avoid catching the thread, the point of the finger 40 being situated considerably above this lip 42, as shown in Fig. 20. When the point 20 0f the .hook catches the'loop and carries it down-.

wardly, as better shown in Fig. 19, the inclination of theslot 19 carries one side of the loop inwardly to the back. of the bobbin case support 23 and the conical formation of the surface of the hook, producing the shedding action on the other side or fold of the loop, carries the latter outwardly, and

consequently puts a twist or half turn in the loop, but as the loop is drawn upwardly j around the under side of the bobbin case support and pulled away from the hook 20,

,it slides over the curved horn or finger 39.,

40, and it is readily seen that this finger acts to bring that side of the loop which was I behind. the bobbin case support, outwardly to the front, and beforeit leaves the point of the horn or finger 40 it is turned completely aroundfto the position which is for 'merly occupiedbefore the hook entered it,

and consequently is untwisted. (See Figs.

20,21.) To utilize thehorn or finger 39, 40,-

for preventing the rotation Tof the bobbin case support it is simply necessary to provide a yoke or stop which engages loosely around the finger with suflicient play to allow the loop to'pass freely over the latter,

This yoke or stop' is in theform of a bar 43, which is better .shown in Fig; 1, and is curved upwardly across :the front side of the bobbin case, and, as shown in Fig. 2,

has an out-ward bend or cove, 44, in which the finger is situated. This bar 43 is held in place by two screws or other means, 45, 46, which are threaded in the ring 6, and in' order that they may also serve as a means -of holding the bearing ring- 10 in place,

they are provided with shoulders which overlap the edges of this bearing ring. These shoulders are shown as being constituted by sleeves 47, through which the screws are inserted and which serve the further useful purpose of holding the bar 43 outward away from the bobbin case.

The bobbin case support 23 is in theform of an annular shell open at the front, but which may or may not be closed at the back. In this example of the invention it is shown as being provided at the back with a mere cross bar or web 48 to close the back of the bobbin case proper 24L, and'its interior is adapted to receive the said case 24, which carries the bobbin 49 of any suitable construction, or, in fact, which carriesany other suitable form of supply of lower thread. In this example, the bobbin is of the rotary or spool form and journaled upon a pin 50 secured centrally within the bobbin case member 24, which is of cup-formation open at its inner end or side, so that when inserted into bobbin case support 23 the bobbin will be completely housed and will be held against displacement inwardly by the cross bar or web 48. The bobbin case member 24 shown in this exemplification' of the invention is of peculiar form, but does not concern the present invention and will be described herein only generally as it constitutes the subject matter of the claims of a co-pending application, Serial No. 186,594, issued September 21st, 1909, No. 934,869, and, indeed, so far as the present invention is concerned, is desirable rather than necessary. One side of the bobbin case member 24 is cut away, as shown at 51., Fig. 15, to form clearance for the thread and needle, and the end wall of the'case opposite this cutaway 51* is forced outwardly to form a tongue 52, against which lies a tension spring 53 of any suitable form, the tongue 52 having a slot 54: for the passage ofthe thread from the bobbin, whence the thread passes between the tongue and spring 53 and emerges through notch 55 in the end of the spring, and thence passes upwardly within the curl of the horn or finger 40 and through the throat plate. The spring 53 is held in place by a tension adjustingscrew 56 screwed into the outer end of the bobbin case 24 and the spring is held against rotation by two branches 57 having their ends slightly countersunk in the face of the case 24.

The bobbin case member 24 is locked in member 23 by a pivoted latch 58 having a projection 59 extending through the side of the bobbin case 24- and adapted to engage in a'slot 60 in the inner wall of bobbin case support 23, the case member 24 having an aperture 61 through which emerges a projection 62, by which the bolt or latch 58 is operated.

63 is a guide or projection on case member 24 adapted to be received in a notch 64 in the outer end of case member 23, thus compelling the parts to go together properly.

Although the bobbin tension is arranged against the outer face of the bobbin case, and therefore affords a straight run for the bobbin thread upwardly, the upper thread is nevertheless subject to considerable abrasion vwhere it passesbetween the throat plate and the lower'thread, and is then subjected to considerable strain, especially under high speed, when the takeup acts to pull it through the throat plate. In order to avoid this objectionable strain and possible breaking of the upper thread, the bobbin is caused to pay out sufficient slack of the lower thread to allow the takeup to pull the upper thread without any resistance, or any material resistance, from the bobbin thread. This is accomplished by journaling the bobbin case eccentric to the journal of the hook, sothat the bobbin case will be given a bodily rising and falling 9, inclusive, and -it is provided for by simply making the journal bearing for flange .26 eccentric to the journal bearing for the ournal 12, or'eccentric to the center of the.

interior periphery of ring 10. In this example of the invention the hookis adapted torevolve from the operator, and with the invention thus described it will be seen that as. the needle comes down and throws out a loop of the needle thread on its inner side, the hook 20 enters said loop and carries it away from the operator and outwardly over and around the other side of the bobbin case support 23 the lower half or fold 36 of the loop being first pulled inwardly under the hook 17, 20, and across the end of the shoulder 37, while the outside half or strand 36 of the loop is carried backwardly by the inclined slot 19 toward the back of the bobbin case support 23, at the ,oint where it passes through the throat 21, ut farther up the thread is forced outwardly, as shown in Fig. 19, by the shedding action of the conical hook 1'7, 20, and cap 28. This strand or half 36 of the loop at the commencement or time that .the hook 20 first enters the loop, is what might 'be termed the inner side or strand of the loop, but as the hook 20 continues to revolve and this side 36 is shed outwardly away from the needle it finally moved subsequently by the curved horn or finger 39, 40, as before described, as the loop comesup the near side and is pulled away from the hook 20 by the takeup, or other" means, in the manner shown in Figs. 20, 21, the hook 20 being revolved at its slowest speed at this time, which is accomplished in the ordinary manner (not shown) and in a manner usual with sewing machines of this character. It will also be seen that the presence of the wall or plate 6 and the-close relation of the .back of the hook body 13 to said wall,.or parts connected with the wall, absolutely preclude the possibility of either of the threads becoming wound around the shaft 5, or any parts connected therewith, or with the hook, and'there' is nothing at the front side of said plate or wall that could act in any way to catch and entangle either thread, and this is true, even though the machine be rotated in the wrong direction or be operated without goods under the needle/ Having thus described my invention, what I claim as new therein and deslre to secure by Letters Patent is: j

2. In a rotary sewing machine, the combination of means for-holding the supply of lower thread, means for throwing out a loop of the needle thread, means for tak ing the inner side or fold of said loop downward and outward around said supply, means for thereafter drawing said loop upward and means for throwing the then Y inner or originally outer side of said 1'00 outwa'rd to untwist it as it i's-drawn upwar 3. In a rotary sewing machine, the combination of means for'holding the supply of lower thread, means for throwing out a 100 of theneedle thread, means for taking said loop around the said supply and imparting a turn or twist thereto, an in-turned finger and means for-drawing the loop-over said finger for removing saidtwist. therefrom:

. 45. In a rotary sewing machine, the combinatioi i' of means for holding the supply of lower thread, means for throwing out a loop of the needle thread, means for taking said loop around the said supply and imparting a turn or twist thereto, an in-turned curved hook-shaped finger and means for drawing the loop over said finger for removing said twist therefrom,

5. In a rotary sewing machine, the combination of a support for a supply of lower thread, means for throwing out a loop of the needle thread, means for taking the said loop downward and shedding the inner fold thereof .outward. around said support, means for thereafter'drawing the loop upward and an inturned finger over which the loop is drawn upward for removing thetwist therefrom, said finger also serving to hold said support against rotation.

6. In a rotary sewing machine, the combination of a support for a supply of lower thread, means for throwing out a loop of the needle thread, means for taking said loop downward and shedding the inner fold thereof outward around said support, means forthereafter drawing the loop upward and a finger on said support curved outwardly therefrom and thence inwardly over the'edge thereof for untwisting said loop as it is drawn upward.

7. In a. rotary sewing machine, the combi- 8. In a rotary sewing machine, the combination of a thread case, a rotary hook, and

a journal bearing therefor, a non 'rotary lower thread case support having'a pro ect-- ing flange constituting a ournal for said case and a bearing-in said hook for said-support journal arranged eccentric to the said journal bearing of the hook.

9. In a rotary sewing machine, the combination of a hook support comprising'a fixed apertured plate, a hook-having a journal situated in the aperture of said plate, a flange removably secured to one end of said journal and overlapping the back of said plate for holding said hook in place, and

means operatively connected with said journal for rotating said hook.

10. In 'a rotary sewing machine, the combination of a hook support, comprising a fixed apertured plate, a hook fitted closely to the face of said plate and. having a journal fitting in the aperture-thereof, the body of the hook overlapping the plate to close the space between the edge of the plate and the journal, a flange secured to the end of said journal directly engaging and over-' lapping the back of said plate for holding said journal against axial movement, a shaft for rotating the hook and an operative conne lztion between the shaft'and the said journa 11. In a rotary sewing machine, the combination of a' hook support comprising a fixed plate or wall having an aperture therethrough and a countersink in the face thereof, and a 'second plate seated in said countersink and having an aperture constituting a journal bearing, a hook fitted immediately against theface. of said second plate and having a journal arranged in the aperture thereof, a removable flange fitted against the back of said second plate and secured to said journal, a lower thread case around which said hook revolves, and means holding said second plate in said countersink and also. holding said thread case against rotation.

12. In a rotary sewing machine the com-, bination with a hook shaft and a revolving hook, of a hook support in which the hook is journaled independently of the shaft, an

operative connection between said shaft and hook, and a fixed continuous wall interposed between the back of the hook and the shaft and said operative connection.

13. In a rotary sewing machine the combination of means for holding the supply of lower thread, means for throwing out a loop of the upper or needle thread, a re volving hook for taking said loop around said supply of lower thread and imparting a turn or twist thereto, and means for subsequently untwisting said loop.

14. In a rotary sewing machine, the combination of a hook support comprising a fixed apertured plate, a hook having a body portion provided with a reduced extremity to form a circumferential shoulder, said reduced portion being journaledin the aperture with the shoulder adjacent one face of the plate, the extremity of the reduced portion being substantially flush with the other face of the plate, a flange remov-ably secured to the extremity and overlapping the said other face of the plate, and means operatively connected to the said reduced portion for rotating the hook.

15. In a rotary sewing machine, the 001m bination of a hook support comprising a fixed apertured plate, a hook having a body portion provided with a reduced extremity to form a circumferential shoulder, said reduced portion being journaled in the aperture with the shoulder adjacent one face, of theplate, the extremity of the reduced portion being substantially flush with the other face of the plate, a flange removably selcured to the extremity and overlapping the said other face of the plate,'a crank pin carried by the flange, and a crank loosely engaging the pin for rotating the hook.

' CHRISTOPHER VVINKEL. Witnesses:

F. P. ELDREDGE,

WILLIS S. BROWN.

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