US2410679A

US2410679A - Sewing machine

Info

Publication number: US2410679A
Application number: US520836A
Authority: US
Inventors: Joseph H Pikul
Original assignee: Reece Corp
Current assignee: Reece Corp
Priority date: 1944-02-03
Filing date: 1944-02-03
Publication date: 1946-11-05
Anticipated expiration: 1963-11-05
Also published as: FR961360A; DE831186C; GB637819A

Description

Nov. 5, 1946. Q PlKUL 2 ,410,679

SEWING MACHINE Filed Feb. 5, 1944 a Sheets-Sheet 1 NbvQ5, 1946. p u 2,410,679

' SEWING MACHINE Filed Feb. 5, 1944 8 Sheets-Sheet 2 Nov. 5, 1946 J. H. PlKUL SEWING MACHINE Filed Feb. 3, 1944 8 Sheets-Sheet 5 5 Q3 4| Jaw k Nov. 5, 1946. J, PIKUL 2,410,679

SEWING MACHINE I Filed Feb. 5, 1944 8 Sheets-Shed 4 Nov. 5, 1946.

J. H. PIKUL SEWING MACHINE Filed Feb. 3, 1944 8 Sheets-Sheet 5 INYENJFURI W RFPJM Nov. 5, 1946. J plKuL 2,410,679

- SEWING MACHINE Filed Feb. 3, 1944 s Sheets- Sheet 6 v Til Q15, J T1519 11525 I311 L915 INVEQ1+EJ RI 2a 1 a Z Z 11y ew cw. 4 PM Nov. 5; 1946, Q

- J. H. PIKUL 2,410,679

SEWING MACHINE Filed Feb 3, 1944 8 Shets-Sheet 7 Nov. 5 1946. J. H. PIKUL SEWING MACHINE Filed Feb. 5, 1944 8 Sheets-Sheet 8 INVIiN+URZ Patented Nov. 5, 1946 SEWING MACHINE Joseph H. Pikul, West Newton, Mass, assignor to The Reece Corporation, a corporation of 'Maine Application February 3, 1944, Serial No. 520,836

9 Claims.

This invention relates to sewing machines and more particularly to machines employing a pair of loopers for the formation of a group of stitches. Machines of this general type are described, for example, in my prior Patent No. 2,131,387, dated September 27, 1938, and in the patent to Avis, No. 2,158,171, dated May 16, 1939.

The machines described in the above patents are adapted to attach buttons having perforations or holes through which stitches are formed, and the two loopers in each of these machines are together oscillated and normally cooperate alternately with a reciprocating needle in the formation of successive attaching stitches through a pair of holes in a button, said loopers coopera ing respectively with the needle on alternate ree ciprocations of the latter through the spaced holes. During the normal operation of the loopers in the formation of attaching stitches, one or the other of the loopers seizes each thread loop cast by the needle on its ascent after descending through one hole in the button, and deflects and positions the same loop for entry by the needle on its next descent through the other hole in the button. In the formation of a tying stitch, after the formation of a group of attaching stitches, the needle is conventionally passed twice through the same hole in the button, and when this occurs the normal operation of the loopers would cause one looper to seize and deflect a thread loop cast by the needle after its first passage through said hole and prior to its second descent through the same hole, so that such loop would obviously be deflected out of the path of the needle and, hence, would not be entered by the latter on its second reciprocation. In order that this same loop will, however, be entered by the needle on its second and final reciprocation in the formation of the tying stitch, either the looper oscillation is reversed after seizure of the loop to bring the latter into the path of the needle on its following descent, and special means are brought into play to position said loop for reception of the needle, as is the case in the machine described in my prior patent mentioned, or an irregular oscillation is imparted to the loopers so that the other looper will seize said loop, as is the case in the machine described in the Avis patent mentioned. Also, in each of the machines described in the aforementioned patents, a cam plate, controlling the opening and closing of loop spreaders associated with the loopers, has to be specially moved in the formation of a tying stitch.

It is the primary aim and object of the present invention to provide in a two-looper machine for the transfer of a needle thread loop, from the looper which seized it, to theother looper for positioning said loop for entry by the needle on its next descent, thereby not only entailing fewer changes in the cooperation "of both loopers than were heretofore necessary for the formation of two types of stitches (attaching and tying stitches), butalso advantageously adapting the two loopers to other types of sewing for which they were heretofore unsuitable.

It is a more specific object of the present invention to provide, in both of the prior art machines referred to, for the transfer of a needle thread loop from the looper which seized it to the other looper, so as to obviate any special loop deflecting means and/or any motion of a spreader-controlling cam plate, for the formation of a tying stitch.

The invention Will best be understood from the following description of an illustrative embodiment thereof shown in the accompanying drawings, in which:

Fig. 1 is a longitudinal section through a sewing machine embodying the present invention.

Fig. 2 is a plan View of certain needle-operating mechanism of themachine.

Fig. 3 is a fragmentary plan view, partly in section, of certain looper-op'erating mechanism of the machine.

Fig. 3a is a fragmentary section taken on the line 3a3a of Fig. 1.

Fig. 3b is a fragmentary section taken on the line 3b -3b of Fig. 1.

Fig. 3c is a fragmentary section through the stop mechanism of the machine substantially along the line .'ic3c of Fig. 32).

Fig. 311 is a section similar to Fig, 3c, showing the stop mechanism in a different position of operation.

Fig. 4 is a front elevation of the same looper operating mechanism, drawn to a larger scale.

Fig. la is a view similar to Fig. 4 showing certain operating elements in a different relative cooperative position, however.

Fig. 41) illustrates in an exaggerated manner the development of one of the cam grooves in the main cam of the machine.

Fig. 5 is a section taken on the line 5-5 of Fig. 1.

Fig. 6 is an enlarged, fragmentary top View of the throat plate of the machine, carrying certain loop-arrester plates on its bottom side.

Fig. 6a is a section taken on the line id-5a of Fig. 6.

Fig. 7 is a section taken on the line of Fig.6.

Figs. 8 to 14, inclusive, are fragmentary front elevations, partly in section, of the stitch-forming mechanism of the machine, showing progressive steps in the operation of the same.

Fig. 14a perspectively illustrates the last step in the formation of a tying stitch.

Figs. 15 and 16 are enlarged sections taken on the lines I|5 and |6l6, respectively, of Figs. and 12, respectively.

Fig. 17 perspectively illustrates the function of the loop-arrester plates shown in Figs. 6 and 7.

Fig. 18 is a plan view of a two-hole button attached to work by the present machine.

Figs. 19, 20 and 21 illustrate several conditions of a freely suspended thread loop.

Figs. 22 and 23 illustrate another example of sewing work which may advantageously be performed by a machine embodying the present invention.

Figs. 24 to 32, inclusive, illustrate progressive operative steps of stitch-forming mechanisms in performing the sewing work illustrated in Figs. 22 and 23.

The present invention, having first been applied advantageously in a button sewing machine, will now be described in connection with such a machine. Having particular reference to Fig. 1 in the accompanying drawings, the frame of the machine comprises a bed I 0, an overhanging head II, and a neck i2 joining the two. The bed l0 carries a work plate I3 upon which the fabric W, to which a button B is to be attached, is supported. Button-holding and work-clamping means is generally indicated at A.

The stitch-forming instrumentalities include an eye-pointed needle 20,' carried by a needle bar 2| which is mounted for vertical or longitudinal reciprocation in the head H, and an underneath looper mechanism 22.

The needle bar 2| is guided at its lower end in a bearing 23, mounted by means of a universal joint 24 on the front end of a carrier alternately through the holes a and b of the button B, by mechanism comprising a link 33 (see also Fig. 2) having a pin or stud 34 projecting downwardly into a longitudinally disposed Way 35 in the upper face of the carrier 25. An upwardly projecting portion of the pin 34 is received in a way 35 in a head 31, having a shank 38 mounted in a bracket 39| in the machine head The way 3.6 extends transversely to the carrier 25 and longitudinally to the link 33 as shown in dot-and-dash lines in Fig. 2. The opposite end of the link 33 is provided with a stud 39 which is adjustably positioned in an arcuate slot 40 in one arm of a lever 4|, secured to an upright shaft 42 which is suitably journalled in the machine frame. Adjustment of the stud 39 in the slot 40 determines the amplitude of the lateral movements or oscillations of the needle in accordance with the spacing of the holes a and b in the button. At its opposite end the lever 4| carries a follower 43 which cooperates with a cam groove 45 in the upper face of a main cam 46, fast on a vertical cam shaft 41 which is driven from the shaft 29 by worm gearing as shown in Fig. 2. Rotation of the cam 45 with-the cam groove 45 will cause the lever M to swing about the axis of the shaft 42, and this swinging movement of the lever M will be transmitted to the carrier 25 through the inter mediation of the link 33. The cam groove 45 is so formed that, during each complete revolution of the cam 46, one group of stitches (attaching stitches followed by a tying stitch) will be produced.

The main cam 46 is also provided with a cam groove 49 which, through linkage to be described hereinafter, controls the operation of the looper mechanism 22 so that the same operates in timed relation with the needle Zlhboth with respect to stitch-forming and with respect 1 to lateral movements during a sewing operation.

member 25 which is itself mounted, as hereinafter described, for movement in a horizontal plane both laterally and longitudinally of the machine frame. The needle bar 2| is guided at its upper end in a bearing 26, mounted by means of a universal joint 2'! in the head II. The needle bar 2| is reciprocated in its bearings 23 and 26 through suitable connections, generally indicated at 28, from a shaft 29 which is suitably journalled in the head H and to which power is applied under the control of suitable stop mechanism described hereinafter.

In attaching a button B to work W (Fig. 18), the carrier 25 is oscillated laterally during successive descents of the needle 28, except during the last two descents of the same, so that the needle will pass alternately through the holes a and b in the button to form a series of attaching stitches s through said holes, and then twice through the same hole in the button to form a tying stitch.

The carrier member 25 for the lower needle bar guide 23. is longitudially slidable in a guide groove in a head 30, having a shank 3| pivoted at 32 in the head I I of the machine. The carrier 25 is, therefore, free to move longitudinally in the head 39 or to oscillate laterally with said head about the pivot axis of the latter.

The carrier 25 is oscillated about the pivot axis of the head 30 to cause the needle to pass The looper mechanism 22 comprises a looper block 50 (Figs. 1 and 4), clamped at 51 to a looper shaft 52 which is iournalled in sleeves 53 and 54 that are, in turn, journalled in bearings 55 and 56, respectively, provided by the machine frame. The looper block 52 carries a pair of

loopers

57 and 58 and cooperating loop spreaders 59 and 58 (see also Fig. 15). The loop spreaders 59 and 60 are pivotally mounted at BI and 62 respectively, in the looper block 53 and are provided with tails or

followers

63 and 64, respectively, which cooperate with a cam plate 65. The cam plate 65 is firmly mounted on the sleeve 53 (Fig. 1). The upwardly bent ends of a suitably mounted torsion spring 56 on the looper block 50 engage the

loop spreaders

59 and 68 in the manner shown in Figs. 10 and 15, and normally urge them into closing engagement with their respective loopers 5i and 58, while

leaf springs

61 and 68 normally prevent axial removal of the

loop spreaders

59 and 63 from the looper block 56. The looper shaft 5| is provided intermediate its ends with an annular recess 69, receiving a parted collar 'a'IJ which, to gether with the looper block 50, prevent axial movement of the sleeve 53 relative to the looper shaft 52. A nut 'II on one end of the other sleeve 54 retains an annular shoulder 12 thereof in engagement with the bearing 56, thus preventing axial movement of said sleeve. Journalled on the. looper shaft 52 is another sleeve 73 which is held axially immovable thereon by means of a collar 13' which is clamped to the looper shaft and straddled at 14 by said sleeve in the manner parting such oscillation to the sleeve l3.

shown in 'Fig. 3 to permit oscillation of the which is guided for movement longitudinally, or

fore and aft, of the machine in guideways provided by the top of the machine bed It. In thus connecting the throat plate IT with the sleeve 73, the latter is held against rotation with the looper shaft 52. The sleeve 13 is also provided with an annularly recessed portion '18 which extends over the parted collar 'lll and holds the same in place. The recessed portion 7 8 of the sleeve .13 receives two opposite set screws 19 and 8% (Fig. which engage machined shoulders 8i and $32, respectively, on the sleeve 53. Hence, the sleeve 53 and the cam plate thereon are also held .against rotation with the looper shaft 52, and may be angularly adjusted on the latter by .rnanipulating the set screws 19 and 80.

Clamped at 83 to the looper shaft 52 is one member 84 of a slider coupling, the other, cooperating member 85 of which is provided by the adjacent end of the sleeve '54 (Figs. 1 and 3). The sleeve Ed is provided with spaced lateral arms 86 (Figs. 3 and 4) which are connected by a link 81 with one end of a rocker 88, pivotally mounted at 89 to the machine frame and carrying a follower 90 which cooperates with the previously mentioned cam groove 49 in the main cam '46. The cam groove l!) is designed to impart to the looper shaft 52 and the looper block 59 thereon the oscillations requisite in the formation of a roup of (attachin and tying) stitches through cessiye descents of the needle 2.8 to cause the latter to pass alternately through one pair of holes in the button so as to form, in conjunction with the looper mechanism 22, a groupof stitches through said one pair of holes, whereupon the carrier '25 and the looper shaft .52 are shifted longitudinally, or in a direction fore and aft, of the machine, to bring the needle and the looper mechanism into position to form another group of stitches through the other pair .of holes .in the button. In order to shift the carrier 25 fore and aft of the machine, for the purpose of transferring the operation of the stitch-forming mechanism from one pair of holes in a four hole button to the other pair .of holes .therein at the end of a complete revolution of the main cam .25,

a linkage (not shown) is provided which, under the control of the main cam 46, shifts the carrier 25 longitudinally of the machine at the proper time. This linkage may be of the same construction as that shown and described in the copending application of Franklin A.Reece, Serial No. 486,187, filed May 8, .1943 and the ,same is adjustable so that the extentof the longitudinal movement of the carrier 25 may be .adjusted to varying spacing of the two pairs of holes .in a

- four-hole button, and also adjustable .so that no together with the carrier 25, the sleeve 1:3?18'0011- 'nected by a stud .95 with a link '96 (Fig. 1) :form- .ing partqof alin-kage (not shown) which is *drivingly connected with the linkage above-mentioned that shifts the carrier 25 fore and :aft of the-machine. Inasmuch as the sleeves 53 and 13 are held axially immovable on the looper shaft 52, the cam plate 65 and the throat plate H are moved axially with the looper shaft .52 and the looper mechanism 22. The coupling member :84, being axially immovable on the looper shaft 52, moves axially with the latter relative to the other coupling member without relinquishing its drivin connection with the latter at any time.

The machine is driven from any suitable power source through belt I50 which passes over a :belt pulley'I5I on the shaft.29 (Fig. 1). The belt pulley I5I is loose onthe shaft 29 and is adapted to be drivingly connected therewith by a combined clutch and stop mechanism which, as herein shown, is similar to that shown and described in the patent to Reece et al. No. 2,134,417, October 25, 1938. Referring to Figs. 1, 3b and 30, said mechanism includes a ring I52 carried by the pulley I5I and having a pin 1 53 which projects through a slot I54 in said pulley and is en gaged by a spring I55, located in a recess in-said pulley, whereby said ring is permitted .a limited yielding angular movement with respect to .the pulley in order to cushion the shock of starting. The ring I52 has a shoulder I58 (Figs. 3c and 3d) adapted to be engaged by a clutch clog I51, pivoted at I58 to a hub I59 (Fig. 3b) which is keyed to the shaft 29 and normally urged into engagement with said shoulder by a spring I60 connecting said dog with an arm is! fixed to said hub. The dog I5? is formed with a stop finger I62 adapted, when the connected parts are rotated in the'direction of the arrow in Fig. 30, to engage and depress laterally extendin head I630; of a rod i63, slidable in a stop arm I64, when the latter is in the position shown in Figs. 3c and 3d and also in dot-and-dash lines in Fig. 1,, thereby disengaging the dog i577 from the shoulder I 56 i as shown in Fig. .312 and stopping the rotation of the shaft '29. A spring urged plunger IBM in the stop arm I86 bears against the head i fita of is disengaged. A pin iii ib on the spring-urged plunger 54a projects into an elongated slot I640 in the stop arm I84 to limit the outward movement of said plunger lt-la. Upward movement of the rod I63 beyond the position shown in full lines in Fig. 1 is prevented by a cross-pin I532) in said rod which engages the stop arm in the manner shown in Fig. 1. Recoil of the shaft 29 under the influence of the spring-urged plunger i Eta is prevented by means not shown herein but fully disclosed in said patent to Reece et al. No. 2,134,417.

The stop arm led is firmly mounted on a rock shaft I 55, journalled in a bracket E65 in the neck I2 of the machine and having secured thereto at the outside of the machine frame an arm I51 (Fig. 3a) connected by a chain E68 with a suitable treadle (not shown) said arm being preferably provided with a spring-pressed positioning plunger i i!) adapted to register with either one of two spaced depressions (one being shown at lit in Fig. 3a) in the outer wall of the machine frame, thereby releasably retaining the stop arm I5 3 in either of the two positions shown in Fig. 1. To start the machine, the treadleis .de-- pressed, thereby rocking the shaft .1 65 so as to move the stop arm I64 into the full-line position shown in Fig. 1. The machine having been started will continue to operate until automatically stopped. For this purpose, the. following mechanism is provided.

Firmly mounted on the inner end of the rock shaft IE is an arm H! to which is pivoted a hunter I12, resting on a stud [13 in a suitable bearing I14 in the machine frame and having a bevelled end I15, adapted to be engaged by a stud I16 which projects from the underside of the main cam 46 when the latter reaches an angular position corresponding to the completion of one group of stitches (attaching stitches followed by a tying stitch). Such engagement of thebevelled end I of the hunter I12 by the stud I16 causes said bunter to be forced toward the right in Figs. 1 and 3a, thereby rocking the shaft I65 clockwise as viewed in Fig. 1 and moving the stop arm I64 into the dot-and-dash line position in Fig. 1 to disengage the clutch and stop the machine. The stud I16 is preferably notched at I11 (Fig. 3a) so that the slight over travel of the parts incidental to stopping the machine will bring said notch opposite the end of the hunter I12 in order to permit the machine to be again started by operation of the treadle.

As shown in Fig. 1, the stud I13, which is manually turnable, is flattened at its end as at I18. In the angular position shown in Fig. l, the hunter I12 rests on the periphery of the stud I13 and is thereby held in the path of movement of the stud I16 on the main cam 46. Hence, in this angular position of the stud I13 the machine will be stopped at the completion of each single group of stitches, i. e. after each complete revo lution of the main cam 45. However, if it is desired to have the machine stopped at the completion of two groups of stitches, as in sewing on a four-hole button, for instance, the operator of the machine, before starting the same, turns the stud I13 so that the hunter E12 comes to rest on the flat end I18 of said stud and is accordingly lowered below the path of movement of the stud I16 on the main cam. Hence, the stud 15 will not engage the bunter I12 after the first complete revolution of the main cam 46, and the stop arm is not shifted into the clutch-disengaging position shown in dot-and-dash lines in Fig. 1, with the result that the main cam 45 will continue its rotation beyond the first revolution. To stopthe machine at the completion of the second revolution of the main cam 45, means, not shown herein but fully disclosed in said patent to Reece et al., No. 2,134, i1'l', are provided which automatically rock the lowered bunter I12 into the position shown in Fig. 1 during the second revolution of the main cam 45, so that said bunter will be actuated by the stud I16 and the machine stopped at the completion of the second revolution of the main cam.

The cooperation between the needle 20 and the looper mechanism 22 in the formation of a group of attaching stitches through a pair of holes in a button, is fully described in the prior patents previously mentioned, the needle 20 being reciprocated and oscillated so as to pass alternately through a pair of holes in the button and the looper shaft 52 with the looper mechanism 22 being oscillated relative to the cam plate 65 to cause the loopers and their respective loop spreaders alternately to seize and spread successive thread loops cast by the needle and deflect said loops into the path of the needle for entry by the same on its spectively.

The entry by the needle 20 of the last thread loop 1 in the formation of a group of attaching stitches through the holes a and b in the button B is illustrated in Fig. 8. During the formation of these attaching stitches, the loopers 51, 58 and their respective loop spreaders perform their normal function, the looper 51 and loop spreader 59 seizing and spreading all loops cast by the needle on ascending through the hole a in the button and deflecting them into the path of the needle for entry by the same on descending through the hole b in the button, and the looper 58 and loop spreader 50 seizing and spreading all loops cast by the needle on ascending through the hole I) in the button and deflecting them into the path of the needle for entry by the same on descending through the hole a in the button. During continued descent of the needle into the last thread loop l in the formation of a group of attaching stitches from the position shown in Fig. 8 into the lowermost position shown in Fig. 9, the looper block 50 is, under the control of the portion 49a (Fig. 4b) of the cam groove 49 in the main cam 46, rocked into the position shown in- Fig. 9 so as to release from the looper 58 and spreader 60 the loop Z which is accordingly cast about the needle and subsequently drawn up against the work W by a conventional take-up (not shown) when the needle clears the work on its following ascent. On said following ascent, the needle leaves behind a thread loop le. For forming a tying stitch, the looper block 50 is, in accordance with its normal operation and under the control of the cam groove portion 49b in the main cam 46, swung or rocked from the position shown in Fig. 9 into the position shown in Fig. 10, so that the looper 51 and loop. spreader 59 seize and spread the loop .l and deflect the same as illustrated in Figs. 4a and 10. However, on its next and final descent in a sewing cycle of the machine, the needle, under the control of the cam groove in the main cam 46, passes again through the same hole a in the button for the formation of a tying stitch. In order that the needle may, on its last descent, enter the loop I, the latter is, in accordance with the present invention, transferred from the looper 51 and loop spreader 59 to the looper 58 and loop spreader 60 so that the normal loop-deflecting function of the latter looper and loop spreader may be used to bring the loop l into the path of the descending needle. This transfer of the loop Z is illustrated in Figs. 10 to 12 inclusive, the hereinafter described movements of the looper and loop spreaders, with their carrier block 50, being produced by a portion 490 of the cam groove 49 (Figs. 4a and 4b). Thus, Fig. 10 shows the loop Z held spread and deflected by the looper 51 and loop spreader 59, while Fig. 11 shows the momentary release of the loop Z from the looper 51 and loop spreader 59 during an abnormal counterclockwise rocking motion of the looper block 50, from the position shown in Fig. 10 into the position shown in Fig. 11, during which motion the loop spreader 59 clears the non-rotatable cam plate 65 and closes against the looper 51. During continued counter-clockwise rocking motion of the looper block from the position shown in Fig. 11 into that shown in Fig. 12, the looper 58 and loop spreader 60 enter the reelased loop Z, the loop spreader 60 engaging the non-rotatable or stationary cam plate and spreading the loop Z only after having entered said loop. The loop Z following descents, re

thus, brought into the path of the descending needle and will be, entered by the same in the, ashicns nin F 2an D n continued descent o the needle from the position shown in Fig. 12, the looper block 5!) is rocked into,- the position shown in- Fig. 13, thereby reeas ns rqmihe op 18. a 99p der W. he. 9.0.1? i h ac ord a a out e and ub equen y r wn gainst the WQ 'EhWE b teet rsc. On t a a c t a ew ng ycl themc i e ee e ast a est 999. lb wh q s s iz d, s ad an e e t by the looper 1 and loop spreader 59 during normal oscillation of the looper block 53, under the control of the portion 39d in the cam groove 49, from the positionshown in Fig. 13 into that sho'wnin Fig." 14. While the loop l is thus held spread and deflected were looper 57 and loop spreader 59, a cutter ltd (Figs. 1 and 3a) is operated just when the machine is stopped, so as to sever'one legof the loop l as at ltlinFi'g. 14a, thereby. concluding the formation of the concatenated loops Z andZ into a knot. The machine. concludes an operating cycle and is stopped when. the follower 90 on the rocker 83 cooperates withthejportion we of the cam groove 49 (Fig. 4b) and the looper block 5%? assumes the posi tion shown in Fig. 14. The groove in the mainjcam it is so designed that the needle Ed is laterally shifted the. next time in the next operating cycle of the machine after the first needle descent, wherefor the firstneedle penetration in the next operating cycle will occur through the hole a (Fig. 14) inthe next button to be sewed on. Since the looper block til stops in the position shown in Fig. 14 when the machine is stopped at the end of an operating cycle, and since the looper 51' and loop spreader 59, in accordance with their normal function, are to seize, spread and deflectthe first loop cast by the needle on its first reciprocation through the hole a in the button in the next operating cycle of the machine, the looper block is, after the restart of the machine, returnedto the position shown in Fig. 13 before the needle 20 descends for the first time. This is accomplished by a quick return portion 499 of the cam groove 59. The portion 10 I81, journalled in the bracket its. Mcuntedon the other end of the stubshaft 56;] is a, rocker 688, adapted to cooperate with the lower end of the rod I63. in the stop arm Hi l. A Spring I89,

acts on the link I85; to maintain the rocker [.883

in engagement with the rod I63. The rod I613,

when depressed on clutch, disengagement; will:

turn the rocker E88 and, hence. ,t-he arm I86, clockwise as viewedin. Fig. 1, and such turning movement of the arm l85will, through intermee diation of the, link i855, bellrcranlg lever 582' and pin [3-], cause movement of the cutter lfiilfrom inoperative position (Fig. 3d) into cuttingposition. The cutter Hit will be retracted intoin:

operative position when the machine is restarted;

andthe rod IE3 is released for return to itsv up.- perrnost position shown in. full lines, in; Fig. 1;

The pin-and-slot connectionlB l. 1.80. between the. cutter I09 and the bell crank lever I82ris: suchthat the cutter ltd may be shifted foreand aft of the machine in sewing on a four-holebutton;

for instance, without. being moved into cutting position.

The present invention further, preferably ineludes. provision forarresting. the releasedloop Z during, its transfer from one looper and loop spreader to. the other, looper and loop spreader. A thread loopfreely suspended as the loop Z in Figs. 1-1 and 19 has, unless spun neutral, a tendency. to twist into a. disposition such as that. shown in Fig. 29, for instance, as. well as curl up or turn up, at its lower endin the fashion shown in Fig.

woof-the camgroove 49' next-swings the looper needle on itsfirstreciprocation. Thereafter, and

until thefollower-9d on the rockerildcooperates with the camgroove-portionddc, the-cam groove 49-shifts the looper blocklaterally for each reciprocationotthe needle, whereby the looper 5-! and loopspreader 5'9 seize and spread allloops castby the needle on ascending through the hole ain. the. button and. deflect them into the path of theneedlefor entry by the sameon descendingthrough the. hole bin button, and the looper 58 and: loop spreader G0; seize and.- spread all loops cast by the needle. onascendingthrough the hole bin the button and, deflect them into the path of theneedlefor entry by the same on descendingthrough the holea in the button. The cutter I00 isof the. form shownsinFig. 3a and pivoted on the s.o.cket 1.6: (Fig. 1.) so. as tobe turnable. about thelatter. and movablefore and. aft of the machine together with the looper mechanism, The cutter MB is also. provided with a slot I80, slidably receiving a pin l8! on a bell cranklever. E82 which is pivoted at I33. to a block ISA. on the bearing provided-by the bed. lit-of themachine. The bell crank lever 182 is; connected by a link I85 with an arm I8 6; on one end ofa stubsh-aft- 21. To prevent any twisting and, curling of the thread loop Z for a safe transfer from one. looper and loop spreader to the other looper and loop spreader, regardless of how the. thread is spun, there are mounted on the.-bot tom side of. th throatplate l1 twoplates. Hi5 and let (Figs. 1 and 8 to 17) having. notches Hi1, and I08, re-

spectively, in .their adjacent edges. These notches, [cl-and 508 are so. arranged that the'notch I98 1 will be entered by the rear leg of each loop while the latter. is beingdeflected and spread by either looper, and cooperating loop spreader (Figs. 15

and 16), and the notch It] will be entered bythe front leg of each loop seized by the looper 5]; and cooperating. loop spreader 59 on being def ectedpand spread by the same. Hence, when the loop, is is momentarily freely suspended as shown, in Fig. 11, the front leg. :10 thereof passes through the notch It? and the rear leg y, thereof passes. through the notch H18 in the manner best shown. in Fig. 17, thus. positively preventing any eventual twisting of the freely suspended loop 1?, as will be readily understood. The notches lilg'i and list also restrain the loop l sufiiciently so that the same will not curl up inthe fashion shOWnin Fig. 21. Iii-fact, one of these plates, preferably the. front plate N; with its.

notch Hi1 is sufficient efiectively ,to prevent twisting and curling of they freely suspended loop- The plate lilfiisprovided at its bottom side adja..

cent the notch lll swith arib It, (Figs. 6, '7 and 17) which, by. forming a downward continuation of the, side wallv of the notch I68 engaged by thev 6a, for instance, thus leaving only a portion of the. loop to, curl up. to an insignificant extent.

Thus, by t e p ov sion of the ot ed. plates 05.

and I06, or even the provision of only one of these plates, the described transfer of the loop Z from one looper and loop spreader to the other looper and loop spreader is assured, and the twisting and curling tendencies of the freely suspended loop are effectively counteracted. Of course; the loop-arrester plates I and IE6 can be dispensed with if the needle thread is spun neutral and the stitch-forming mechanism accurately timed for the occasion. a

'It is now apparent that, by transferring the loop 1 from one looper and cooperating loop spreader to the other looper and cooperating loop spreader in the formation of a tying stitch, the normal loop-seizing, spreading and deflecting functions of both loopers and cooperatingloop spreaders are utilized, and the cam plate 65 may remain stationary for the formation of the attaching stitches as Well asthe terminating tying stitch formed by the machine during an operating cycle thereof.

The described transfer of a thread loop from one looper and loop spreader to another looper and loop spreader, while advantageous in the attachment of a button to material, as explained, is also advantageous for other types of sewing work, for example, in the attachment of a tag I toworkW' (Fig. 22). The stitch-forming mechanism employed for the tag attachment may be like that described in connection with the button sewing machine and include a reciprocatory and oscillatory needle I2 I, an oscillatory looper'block I22 with spaced loopers I23, I241 and cooperating loop spreaders I25, I26, There may also be provided a loop-arrester plate I2'I of the same construction and'function as the plate I06 in Fig. 17. In attaching the tag I20 to the work W, the needle I2I first descends through one hole (I28, for instance) of a series of holes I28 to I3I in said tag and through the work W, whereupon the looper I23 and loop spreader I Will, during clockwise oscillation of the looper block I22 as viewed in Fig. 24, seize the thread loop Z cast by the needle and deflect said loop into the path of the needle for entry by the same on its following descent through the hole I29 in the tag. On the following retraction of the needle from the hole I29, the looper block I22 reverses its oscillation, thereby releasing the loop Z from the looper I23 and spreader I25 and seizing the next cast needle thread loop 2 with the looper I24 and spreader I26; The loop I is in the meantime drawn up against the work W by suitable take-up mechanism (not shown), and the loop Z is deflected in the fashion shown in Fig. 25. The needle then descends through the hole I28 and enters the spread and deflected loop Z whereupon the latter is, on clockwise oscillation of the looper block from the position shown in Fig. 25 into that shown in Fig. 26, released from the looper I24 and spreader I26 and drawn upagainst the work. During such clockwise oscillation of the looper block 22 and while the needle ascends through the hole I28, the looper I23 and spreader I25 seize the next needle thread loop Z and deflect the same in the fashion shown in Fig. 26. However, since the needle next descends through the hole I36 in the tag, the loop Z requires transfer from the looper I23 and spreader I25 unto the looper I24 and spreader I26 in order that said loop may be deflected into the path of the needle on its next descent. Hence, before the work W is fed in the direction of the arrow in Fig. 28 to bring the hole I in the tag into alignment with the needle; the looperoscillation is'reversed in order to accomplish'the referred transfer'of the loop l (Figs. 26, 27 and 2251 When the Work is fed forwardly into the position shown in Fig. 28, the transferred loop I is drawnfrom the notch in the loop-arrester plate I21 "and into a forwardly extending portion I39 of the throat I 38 in a stationary throat plate I (see dot-and-dash line position of throat in Fig. 23) whereby the loop Z is deflected in the manner shown in Fig. 28 to form an open thread triangle which the needle may enter on its next descent through the hole I30 in the tag. After entry of the needle in the deflected loop 1 the looper block I22 is swung from the position shown in Fig. 28 into that shown in Fig. 29, thereby releasing the loop Z from the looper I24 and spreader I28, as Well as seizing the next needle thread loop 1 with the looper I23 and spreader I25 and deflecting the latter loop into the path of the needle for entry by the same on its next descent through the hole I3I in the tag. On ascent through the hole ISI- in the tag, the needle casts the next loop I which is seized and deflected by the looper I24 and spreader I26 on counterclockwise oscillation of the looper block I22 as shown in Fig. 36. However, since the needle next descends through the hole I29 in the tag, the loop 1 requires transfer from the looper I24 and spreader I26 unto the looper I23 and spreader I25 in order that said loop may be deflected into the path of the needle on its next descent. Hence, before the work W is fed rearwardly in the direction of the arrow in Fig. 32 to bring the hole I29 in the tag into alignment with the needle, the looper oscillation is reversed in order to accomplish the mentioned transfer of the loop I. (Figs. 30, 31 and 32). In this fashion five chain stitches s to s are formed (Figs. 22 and 23) by which the tag I28 is attached to the work W. A tying stitch s may finally be formed by passing the needle twice through the hole I 29 in the tag and accordingly operating the looper mechanism I22.

.I claim:

1. In a sewing machine, the combination with a work-penetrating needle and two spaced loopers together movable in opposite directions, of means to move said loopers in one of said directions to seize with one looper a needle thread loop cast by the needle, and then in the opposite direction to withdraw said one looper from said loop and seize the latter with the other looper.

2. In a sewing machine, the combination with a reciprocatory and oscillatory needle and looper mechanism including two spaced loop-handling devices together movable in opposite directions to seize thread loops cast by the needle in its oscillatory end positions, respectively, and deflect them into the path of the needle in its other oscillatory end position, of means to move said devices in said opposite directions to cooperate with the oscillating needle in the formation of first stitches= in work, andyto move said devices once in both.

of said oppositedirectionsduring a repeat re-- ciprocation of the needle in one of its oscillatory end positions to cause seizure and deflection of a,

needle thread loop alternately by said devices and. its release from the latter between said alternate. seizures for the formation of another stitch differently disposed than said first stitches.

3. In a sewing machine, the combination with: a reciprocatory needle and two spaced loop-han-- dling devices together movable in opposite directions to cause seizure and deflection of a needle thread loop alternately by said devices and its release'from the latter between said alternate seiz 13 ures, of means to hold said released loop for seizure by the next-seizing device.

4. The combination in a sewing machine as set forth in claim 3, in which said means comprises an element having a notch in which one leg of said released loop is received.

5. The combination in a sewing machine as set forth in claim 3, in which said means comprises an element having a notch into which one leg of said loop moves on deflection of the latter by either device and in which said leg remains while said loop is released.

6. The combination in a sewing machine as set forth in claim 3, in which said means comprises.

an element having a notch into which one leg of said loop moves on deflection of the latter by either device, and in which said leg remains while said loop is released whereby any twisting tendency of the released loop is counteracted, and a wall portion of said notch extends beyond the confines of the latter and is engaged by said leg whereby any curling tendency of the released loop is counteracted.

7. In a sewing machine, the combination with a reciprocatory and oscillatory needle and looper mechanism including two spaced loop-handling devices together movable in opposite directions to seize thread loops cast by the needle in its oscillatory end positions, respectively, and deflect them into the path of the needle at its other oscillatory end position, of means to move said devices in said opposite directions to cooperate with the oscillating needle in the formation of first stitches in work, and to move said devices once in said opposite directions during a repeat reciprocation Y 14 mechanism including two spaced loop-handling devices together movable in opposite directions to position thread loops left behind by the needle in its oscillator end positions, respectively, for entry by the needle in its other oscillatory end position, as well as mechanism to reciprocate the needle alternately in its oscillatory end positions a number of times and then reciprocate the needle at least twice in the same oscillatory end position for the formation of chain stitches and a tying stitch, of mechanism to move said devices in said opposite directions during successive needle reciprocations, respectively, except during the repeat reciprocation of the needle in the same oscillatory end position, and. to move said devices also in said opposite directions during said repeat needle reciprocation to cause alternate looppositioning operations of said devices.

9. In a sewing machine, the combination with a reciprocatory and oscillatory needle, of two spaced loopers and cooperating loop spreaders together movable in opposite directions, a cam immovable in said opposite directions and adapted to actuate said spreaders, said loopers, spreaders and cam being so coordinated that the loopers and their respective spreaders will, on movement in said opposite directions, seize and then spread thread loops cast by the needle in its oscillatory end positions, respectively, and deflect them for entry b the needle in its other oscillatory end position, and means to move said loopers and spreaders in said opposite directions to cooperate with the oscillating needle in the formation of first stitches, and to move said loopers and spreaders once in said opposite directions during a repeat reciprocation of the needle in one of its oscillatory end positions to cause seizure, spread and deflection of a needle thread loop alternately by said loopers and cooperating loop spreaders and its release from said loopers and spreaders between said alternate seizures for the formation of another stitch differently disposed than said first stitches.

Y JOSEPH H. PIKUL.