US1149504A - Sewing-machine loop-taker. - Google Patents

Description

SEWING MACHINE LOOP TAKER.

APPLICATION FILED JULY I2. I91].

' 2 5HEETSSHEET l.

' mm/ro/w I I Patented Aug. 10,1915.

WITNESSES.

A TTOR/VEY P. DIEHL & M. HEMLE B.

SEWING MACHINE LOOP TAKER.

APPLICATION FILED JULY 12. 1911.

LM9 504. Patented Aug. 10,1915.

2 SHEETSSHEET 2.

PHILIP DIEI-IL AND MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNORS TO JiES PA FIQEQ THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE LOOP-TAKER.

Specification of Letters Patent.

Patented Aug. 10, 1915.

Application filed July 12, 1911. Serial No. 638,059.

To all whom it may concern:

Be it known that we, PHILIP DIEHL and MARTIN HEMLEB, citizens; of the United States, residingat Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Loop-Takers, of which the following is a specification, reference being had therein to the accompanying drawings.

This inventlon relates to an improvement in stltch-formmg mechanism comprlsing a reciprocating needle and a circularly mov ing loop-taker carrying a lower thread, and particularly to a speclal construction for a loop-taker of thls class havlng continuous or reciprocatory rotary movements. and

formed with a thread-cavity in which is journaled a stationary thread-case and provided with a beak adapted to seize a threadloop from the needle to distend the same so as to carry one limb thereof behind the thread-case where it is temporarily detained while the other limb of the loop is cast over the outer face of the thread-case'after which the loop is released to be drawn up to the work with the lower thread which it is caused to embrace in producing a lockstitch. Heretofore, it has been customary to form that part of the loop-taker adjacent the beak with a forwardly and inwardly inclined cast-off portion upon which the forward limb of the needle-thread loop is led from the throat or base of the beak intermediate the forward and rearward faces of the loop-taker from which position it has been caused to slip from 'the cast-oif portion over the forward face of the threadcase in the loop-casting operation produced by the rotation of the loop-taker. The castotf portion referred to served to'supplement the partial distention in an axial direction of the thread-loop not fully effected by the beak itself. While the provision of the loop-taker with a cast-off portion for the purpose described has been efiective under certain conditions, it has frequently caused defects in the work through the breaking of thread or the leaving of loose thread-loops upon the under side of the work in cases wherein a more or less sticky needle-thread is employed or wherein the surface; of the loop-taker has contained particles of dust or dirt through temporary disuse, or other causes not infrequently met with.

lhe present invention has for its primary object to produce a loop-taker which manipulates the needle-thread loop in a practically positive manner during vthe seizingand the casting .of the same around the mass of lower thread, and preferably maintains 'the same completely under control between such period and the point of final release whereby it is caused to embrace the lower thread in the production of a lock-stitch.

In the preferred embodiment of the present improvement the loop-taker comprises a stationary thread-case formed with a peripheral bearing rib cut away on one side of the same to produce opposed and spaced loop-arresting and loop-detaining shoulders, in COIlJHIlCtlOIl with a rotary loop-seizing member or hook-ring formed with an axial edge extending from the forward extremity of said throat at an inclination to the axis of the hook-ring, serves to carry the other limb of said loop across the front face of -the thread-case to be subsequently drawn up around the lower thread to the lower face of the work by means of the take-up.

The hook-ring preferably has at its heel, overlying the bearing rib of the threadcase, a flange formed with an inwardly extending point directed toward and spaced from the beak at a distance substantially the same as the spacing apart of said looparresting and loop-detaining shoulders of the thread-case and cooperating with the loopdetaining shoulder in retaining the threadloop drawn off the beak by the action of the take-up until its size is sufliciently reduced to prevent kinking or entangling at a point substantially at or near the loop-seizing position.

The loop-taking member or hook-ring is preferably fixed upon a rotary shaft to which are imparted two rotations for each reciprocation of the needle, so that one excursion of the loop-taking member is performed while the needle is-above the work and thread-loops are therefore seized only during alternate rotations Means are provided for holding the thread-case against participating in the rotary movements of the loop-taking member.

The beak of the loop-seizing. member is preferablyarranged in a plane substantially parallel with the face of the latter and in tangential relation with its circular path of movement, whereby when the limb of the thread-loop resting in its throat has been carried slightly beyond the diameter embracing the loop-seizing position, the beak will have a slight upward inclination which will subsequently increase as the operative movement progresses, so that the take-up may begin its operation in drawing up the loop practically as soon as the latter has reached its condition of greatest distention by the loop-taker in the loop-casting operation. This is a matter of considerable importance, as it insures a very close conformity between the rate of loop delivery of the loop-seizing member and the -loopdrawing action of a form of stitch-setting mechanism .known as the link take-up forming the subject of the United States patent to Philip Diehl No. 462,398, dated November 3, 189.1, in which the take-up arm receives one reciprocatory movement for each reciprocation of the needle. By the use of the vibratory take-up referred to, and by timing it to begin-its action at substantially the instant that the throat of the looptaking member is at the greatest distance from the loop-seizing point, the thread-loop is drawn off the beak at a rate slightly in excess of the speed of the latter but is steadied by the somewhat less swiftly moving beak until its size is materially reduced, but after complete disengagement therefrom it is still confined between the body of the thread-case and the loop-taking member un til the hooked end of the flange at the heel of the latter recedes from the detaining shoulder of, the bearing rib, when its size is sufiiciently reduced to insure'against kinking or knotting in the final drawing upand setting of the loop in the lower face of the work.

The invention will be understood by reference to the accompanying drawings, in which- Figures 1, 2, 3 and 4 are perspective views representing the loop-taker with its active or loop-seizing member in different positions relative to the thread-case, Fig. 1 showing the needle delivering a thread-loop to the loop-taker. Fig. 5 is a side view and Fig. 6 a face view of the loop-seizing member or hook-ring, and Fig. 7 is a perspective view of the part of the thread-case having the rib-and-groove connection with the hookring. Fig. 8 is aperspective view showing the operative parts of a sewing machine embodying the present improvement, with the frame represented in dotted lines.

As shown in the drawings, the present improvement is designed more particularly for embodiment in the Singer revolving hook machine representedin the patent of Henry J. Cox, No. 1,062,696, dated May 27, 1913, although adapted for other machines of this general type.

Theloop-seizing member or hook-ring is shown formed with a circular body 1 connected by means of the radial arms 2 with the hub 3 which is in practice fixed upon the forward end of the rotary loop-taker shaft. The body 1 is formed with the usual axial thread-cavity having near the forward edge of its inner wall the annular groove 4 closed on the front side of the loop-taker by the overhanging lip or flange 5 of a segmental plate 6 removably secured by screws 7 to the body portion 1, which latter is cut away on one side adjacent said plate to form the loop-seizing beak 8 having the point 9 at the forward edge from which extends backwardly and inwardly across the groove 4 the inclined loop-deflecting edge 10. The forward edge of the beak is preferably disposed in a plane transverse to the axis of the looptaker and is provided near the point with the needle-clearance recess 11.

The beak is disposed in a plane substantially parallel with the axis of the looptaker and extends inwardly from the circumference in substantially tangential relation with the thread cavity, or the circle of rotation, being nearer to the axis at its body than either at its base or point which are substantially equidistant therefrom, and overlying the beak and spaced therefrom is the loop-deflector 12 affording at its junction with the base of the beak the throat 13 disposed nearly parallel with the axis. As represented in the drawings, the rearward edge 14 of the deflector extends from the rearward end of the throat at the same inclination as the loop-deflecting edge 10 of the beak, while its forward edge, extending from the front end of the throat crosswise of the edge 10 is reversely inclined backwardly to a position axially intermediate the point and throat of the beak. The throat is thus closed laterally throughout its length so as to securely confine within it the forward limb of a needle-thread loop entered by the beak, while the forward operative edge 15 of the deflector serves, in

case.

.the forward extremity of the throat where it is retained at the extreme forward edge of the loop-seizing member during the loopcasting operation. In other words, the

spreading edge 10 spreads the loop toward the rear while the deflecting surface 15 defiects it to the forward corner or throat of the triangular beak and over the opposite ends of the thread-case. The flange or lip 5 is formed at its adjacent extremity or heel with an inwardly extending loop-detaining point directed substantially toward the beak and-having an inclined edge 5 overhanging and in angular relationwiththe groove 4 for a purpose to be later described. The wall of the groove 4 nearest the bottom of the thread-cavity affords an annular threadcase supporting shoulder by means of which the thread-case is sustained free from contact with the bottom of its surrounding cavity, and crosswise of this shoulder extends the loop-deflecting edge 10 of Y the beak 8. Disposed substantially in the plane of said shoulder, as represented in Fig. 5, is the point of the loop-deflector 12 whose loop-engaging or operative edge 15 is inclined forwardly therefrom.

The forward edge of the loop-seizing member is formed beyond the throat 13 relative to the beak with a pull-off flange having the operative edge 16 inclined to the plane of movement of the beak. I

The thread-case is shown formed of two separable parts which, for convenience, may be termed respectively the carrier and the The carrier is constructed with the annular body 17 provided at its rearward end with the cross-bar 18 sustaining the axially disposed pin or post 19, formed with the annular notch or neck 20 adjacent its rounded forward extremity 21, and it is provided externally with the annular bearing tongue or rib 22 fitted to the groove 4 of the hook-ring and formed at intervals with,

I the thread-clearance notches 23. At the forward end the wall of the carrier is extended forwardly to form a tongue 24 having a tapered and outwardly bent extension 25 provided in its forward extremity with the parallel sided notch 26 to admit the holder for restraining the carrier against rotation with the loop-seizing member. One edge 27 of the extension 25 lies in front of and is inclinedto the plane'of movement of the loop-seizing beak and also to its path of movement adjacent thereto in said plane; and a forwardly extending lug 28 is provided upon the extension 25 adjacent the thread-deflecting edge27 and at the margin of the notch 26. The bearing .rib 22 is cut away adjacent the tongue 24 to form a J slightly undercut loop-arresting shoulder 22 disposed in opposition to the loop-seizing beak and arranged at substantially the base of the tongue 24, and an opposed loopdetaining shoulder 22 substantiallv in register with the notch 26 in the lug 25 entered by the needle in delivering its thread-loops to the loop-taker, the spacing of the looparresting and loop-detaining shoulders being siibstantially the same as the spacing of the point of the beak from the loop-detaining point at the heel of the loop-taker.

The case 29 inclosing the bobbin is formed with a cylindrical body closed at its forward end and is in practice provided with a tubular axial post fitted upon the support-- ing pin 19 of the carrier as a bearing and upon which is mounted the bobbin carrying the mass of lower thread. This case. is preferably constructed as shown and described in our Patent No. 1,125,669, dated January 19, 1915, being provided with a latch-plate 30 by means of which it is detachably confined upon the post 19, and provided with the tension-spring 31 overlying its forward face and formed with the thread-delivery notch or aperture .32 from which the. bobbin-thread is led upwardly over the deflectingkedge 27 of the carrier-lug 25.

eferring now more partlcularly to Fig. 8, the frame comprises the bed-plate 33 with overhanging bracketarm 34 in which is journaled the mainor needle-driving shaft 35 carrying at its rearward end the driving pullev 36 and adjacent the same, within the vhollo w standard of the bracket-arm, the pinpulley 37 embraced by the flexible perforated belt 38, which-is shown crossed and encircling the smaller pin-pulley 39 fixed upon the rearward end of the loop-taker shg 1 f t 40 journaled beneath the bed-plate of the machine and receiving two rotations for each single rotation of the main-shaft 35. The

hub 3 of the hook-ring is'fixed upon the fora mg needle-bar 44 suitably journaled in the head'of the bracket-arm and having fixed thereon the collar 45 carrying the lateral stud 46 which is embraced by a boss at one end of the pitman 47 whose opposite end embraces the crank-pin 48 of a block 49 at the outer end of the take-up crank-pin 50 which is fixed in the crank-plate 51 upon the forward end of the main-shaft 35;

The crank-pin 50 is embraced by the lower end of a link 52 connected by means of the &

pivotal pin 53 with the free end of a swing ing arm 54 having'at its other end a boss fitted upon the stationary fulcrum-pin. 55 which is fixed in the head of the bracketarm. The link 52'is provided at its upper end with the forwardly extending take-up arm 56 having the thread-eye 56 which is thus offset from the pivotal connections of said link with the actuating crank-pin and the swinging arm 54. As indicated in the drawing, the needle-actuating crank-pin 48 has a rigid connection with the take-up crank-pin 50, but is set slightly in advance of the same relative to the direction of rotation and the fulcrum-pin 56 is disposed above and rearward of the mainsshaft, the arrangement of the parts being such that the take-up is caused to begin its descent substantially simultaneously with the needle and gives up slack after the needle begins to rise sufficiently to permit the required distention of the thread-loop by the looptaker in the loop-casting operation, and at the completion of the latter gradually draws the distended loop from the beak of the loop-taker which latter follows the loop for a time during the succeeding portion of its revolution to prevent kinking as the loop is reduced in size in being drawn up to the work.

The feeding mechanism is of well-known construction, and comprises the feed-dog 57 working through the usual apertures-58 .in the throat-plate 59 and secured upon the feed-bar 60 pivotally connected at its rearward end with the upwardly extending feedrocker 61 of the rock-shaft 62 having the lateral arm 63 pivotally connected with the lower end of the link-bar 64 forked at its upper'end to embrace the actuating eccentric 65 upon the main-shaft, the link-bar being sustained by a pivotal connection with the swinging link 66 journaled upon the ful crum-stud 67 carried by the feed-regulating bellcrank lever 68 mounted upon the fixed stud 68 The opposite end of the feed-bar has a sliding and pivotal connection with a lateral crank-arm 69 of the feed-lifting rock-shaft 70 carrying the lateral arm 71 pivotally connected with the lower end of the pitman 72 having at its opposite end the strap 73 embracing a crank upon 'the main-shaft.

Opposed to the feed-dog is the usual presser-foot 74 attached to the springpressed presser-bar 75. p

The machine is rovided with the usual needle-thread tension device 76 through which the thread is led from the guide-eye 77 and thence beneath the check-spring 78 and under the compensator-arm 79 carried by the presser-bar, through the eye 56" of the take-up arm 56 to the needle-eye.

In the operation of the machine, the needle descends and as it begins to rise presentsaloop of needle-thread a which is entered by the point of the loop-taker, as represented in Fig. 1, the lower thread I) leading from'the face of the thread-case to the need1e-hole 59 of the throat-plate being maintained out of the pathof the looptaker beak by the edge 27 of the lug 25 against which it rests. As the member 1 continues its loop-casting movement, the needle-thread loop is thrust backwardly by the action of the deflecting edge 10 of the loop-taker beak for engagement of the in.- ner limb a with the loop-arresting shoulder 22* of the thread-case, and the outer limb a of said loop is positively thrust forwardly by the deflector 12 whose base confines it within the throat 13 to cause it to lead from the forward extremity of the latter across the edge of the loop-taker to the needle-hole, as represented in Fig. 2. In completing its semi-rotation from the loopseizing. position, the loop-taker carries the forward limb of the thread-loop over the front face of the thread-case to the position represented in'Fig. 3, wherein the takeup begins its thread-drawing movement which is continued at such a speed that the reduction in the size of the distended thread-loop causes the latter to be drawn gradually from the loop-taker beak but not wholly disengaged therefrom until the point of the beak has traversed nearly a quarter clrcumferencefrom its extreme lower eastoff position. At this time the needle-thread loop, greatly reduced in size, freely embraces the upper portion of the cast-off side of the thread-case, being. confined by the bearlng rib '22 and the overlapping flange 5 of the loop-seizing member. As the looptaker beak has a flat outer face extending throughout its length and inwardly from the periphery of the body portion, as before explained, the thread-engaging portion .of the loop-taker becomes upwardly inclined at the throat before the loop-taker completes a semi-rotation from loop-seizing position,- so as to permit, with the aid of the take-up, an early cast-off of the needlethread loop lying in the throat, as represented in Fig. 3. By making the throat 13 substantially parallel with the axis of the loop-taker, the thread-loops are carried forcibly around'the thread-case and are not permitted to roll thereon as would be the case if the throat were at an inclination to the axis as in previous constructions. This arrangement of the loop-taker throat obviously contributes also to the early castofi" in insuring the movement of both limbs of the loop simultaneously into cast-off position. The drawing up of the loop continues until the heel of the loop-seizing member arrives at substantially the loopseizing position, wherein the point 5 of the flange 5 overlies the extremity of the threadcase flange 22, the thread-loop being at such instant, as represented in Fig. 4:, confined between the inner edge of the flange 5 and the detaining shoulder 22 with its forward limb resting upon the inclined edge 5 of the flange 5 and thence extending forwardly beneath the feed-dog and upwardly through the needle-hole. The continued movement of the loop-seizing member 1 produces the separation of the shoulders 5 and 22 and the release of the thread-loop which is now, owing to the elasticity of the thread, too small to kink in the final stitch-setting action which is promptly concluded. As described in our said Patent No. 1,125,669, the thread-deflecting edge 27 of the notched flange 25 extends in front of and-at an inclination to the plane of movement of the point of the loop-seizing beak and also to the path of circular movement of the latter within said plane, so as to insure that the lead of the thread from the delivery aperture 32'of the tension spring on the face of the thread-case to the needle-hole in the throat-plate shall be out of the path of movement of the point of the loop-taker. As the drawing up of the needle-thread loop around the lower thread leading into the needle-hole tends to draw the lower thread laterally into the notch 26 and thus out of engagement with the operative edge 27 of the flange 25, the latter is formed with the lug 28 which serves to prevent the lateral displacement of the lower thread and to prevent its entrance into the notch 26 for a more direct lead to the needle-hole so as to be caught by the point of the beak at the beginning of its idle rotation.

While we have shown and described herein what we consider the best form of the present improvement, it is to be understood that its component novel features are not required to be all associated together in carrying out the invention nor to be con- 7 structed precisely asdisclosed herein, so 1on as they embody the described principles of operation to produce the results aimed at.

Having thus set forth the nature of the invention, whatwe claim herein is 1. A sewing machine loop-taker comprising a rotary loop-seizing member formed with an axial thread-cavity and having a beak with its throat disposed substantially parallel with the axis and extended to the extreme forward edge of said member, said beak being formed with a loop-distending portion extending backwardly from said ext'remeforward edge, a thread-case journaled within said thread-cavity and spaced from the rearward extremity thereof, and means for forcibly deflecting the external limb of a thread-loop entered by said beak into the forward extremity of the throat of the latter.

2. A sewing machine loop-taker comprisheel a flange overlying the rib of f said thread-case and formed with an inwardly extending point directed toward and spaced from said beak a distance substantially the same as thespacing apart of said loop-arresting and loop-detaining shoulders of the thread-case.

3. In a sewing machine, the combination with a reciprocating needle, of a loop-taker comprising a rotary loop-seizing member provided with a beak having its loop-seizing point at the forward edge of said member, and a thread-case comprisinga carrier journaled within and supported by the loop-seizing member and provided with a flange having a notch embracing the needle-path and an adjacent thread-engaging lug, said flange having adjacent said notch a thread-deflecting edge extending in advance of and inclined to the plane of movement of the loopseizing beak and also to the path of circular movement of the latter within said plane, and a removable case sustained by said carrier and having a thread-delivery aperture intermediate the plane of circular movement of the loop-seizing beak and the extremity of the thread-deflecting edge of said flange in front ,of said plane.

4. A sewing machine loop-seizing member constructed with a circular body containing an axial thread-cavity provided with means for sustaining a thread-case free from contact with its rearward end and having a beak with a flat outer face parallel throughout its length with a plane embracing the axis of said body and formed with an inclined rearwardly extending loopdistending edge and a deflector having an operative edge extending from a position at the inclined edge of the beakintermediate the point and base thereof.

5. A sewing machine loop-seizing member constructed with a circular body containing an axial thread cavity provided upon its inner side-wall intermediate" the ends with an annular shoulder for sustaining a thread-case free from contact with its rearward end and having a beak with both point and base at the extreme forward edge of the body and with an inclined loopdistending edge crossing said thread-casesustaining shoulder and a deflector overlying and spaced from said beak and forming therewith a throat parallel with said axis and provided with an operative edge extending from a position at the inclined edge of the beak intermediate the point and base thereof to the forward extremity of said throat.

In testimony whereof, we have signed our names to this specification, in the presence of two subscrlblng Witnesses.

PHILIP DIEHL. MARTIN HEMLER.

Witnesses:

HENRY J. MILLER, HENRY A. KORNEMANN, J r.

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