US1902864A - Method of and mechanism for extracting interconnecting threads between stitched books - Google Patents

Description

March 28, 1933. o. KLEINSCHMIT 1.902,864

METHOD OF AND MECHANISM FOR EXTRACTING INTERCONNECTING THREADS BETWEEN STITCHED BOOKS Filed April 21, 19:52 4 Sheets-Sheet 1 221 /2 for:

Mar :h 28, 1933. o. KLEINSCHMIT 3 4 METHOD OF AND MECHANISM FOR EXTRACTING INTERCONNECTING THREADS BETWEEN STITCHED BOOKS Filed April 21, 1952 4 Sheets-Sheet 2 izw a March 28, 1933. o. KLEINSVCHMIT 5 5 i 7 METHOD OF AND MECHANISM FOR EXTRACTING INTERCONNECTING THREADS BETWEEN STITCHED BOOKS Filed April 21, 1952 4 Sheets-Sheet 3 j fo van fqf'" March 28,1933. o msc rr 1,902,864

MECHANI TERQONNEGTING FOR EXTRACTING HREADS BETWEEN STITCHED BO Filed April 21, 1932 4 Sheets-Sheet 4 METHOD OF Patented Mar. 28, 1933 N1TEn STATES PATENr'oFFI OSCAR KLEINSCHMIT, or LEIPZIG-PLAGWITZ, GERMANY, AssIeNoR 'ro GEBRUDER EEEHMEE, 0E LEIPZIG-PLAGWITZ, GERMANY, A. LIMITED PARTNERSHIP or GER- MANY METHOD OF AND MECHANISM FOR EXT RACTING INTERCONNECTING THREADS BETWEEN STITCHED EooKs Application filed April 21, 1932, Serial No. 606,748, and in Germanylune 4, 1931. i

The present invention relates to bookstitching machines and more particularly concernsthat type of machine in which book-sections are fed, upon a stitching saddle to suitable thread stitching-means and progressed therefrom in the form ofa continuously stitched book-pad comprising a series of completely stitched bookswhich are joined together by interconnecting threads which may ormay-not be inthe formof idle or locking stitches.

When such interconnecting threads are severed in order to separate thebooks, the severed threads are left interhanging in the loops of the terminal stitches of the adjacent books and must be extracted from these books to complete the separation of the books. V a

The object of this invention is to provide an improved method of and means for extracting the interconnecting threads of a stitched book-pad after the manual or mechanical severance of the said terminal threads. r

According to this invention in a method of extracting the severed interconnecting threads of a stitched book-pad from the loops of the adjacent stitches the thread to .be extracted is positively engaged and guided so that by the normal progression of the book-pad the thread after its severance is freed from the adjacent threadloops. 7 y y In carrying this method into effect use is made of the movement of the book-pad'per se to extract the interconnecting threads which are severed by means actuated and controlled mechanicallyor manually in any desired manner. Such thread-severing means do not form any part of the present invention and therefore are not herein described or shown in the accompanying drawings. r

In one constructional embodiment of this invention, a wedgeshaped threadguiding and extracting device is provided preferably by arranging two thread guiding members with their shafts inclined one to the otherin the form of a wedge having its apex formed by the hooked portions of. the

h a(l-guiding members. The thread guid ing members are set preferably horizontal or parallel to the stitched back of the bookpad and have theirhooks touching at a common point to formja nose and extending obliquelyaway from the nose in the form of wings or horns.

If desired, when dealingwith than 10515 stitches not formed With idle stitches, one

guide or extractor shaft only; i. e. that furthest from the stitches to be extracted,

is'inclined relatively to the longitudinal sides of; the book; while theother guide or extractor shaft is set parallel thereto.

In another form of the device the head only of the thread extractingdevice may be wedge-shaped, the body or the. device being parallel shafts.

formed, for instance, by The thread extracting device so arranged extension of i is reciprocatedl to engage and guide the threaded loop to: be extracted and'the nose of the devicepenetrates the chain loop so that the threads thereof lodge behind the oblique wings or horns of the saidthread guiding members and during the return movement of the latter member the threads of the loop are pulled therewith During the stitching and progression of the subsequent book sections the threads held by the extracting device are pushed along the length thereof and owing to the inclination of the guide shafts the loop is'openedto an increasingly wider extent until the inter connecting terminal thread which; mean- While, has been severed, isdrawn outofits suspending loop. i

When idle stitches are pad and are to be severed, the formation of these stitches may be utilized. to time meused a thebook-i chanically the actuation of the above described extracting device or devices. v

Three forms of adevice for carrying the methodof this invention into effect, and an operative arrangement of mechanism incor:

porati'ng the devices will now. be described with reference to the appendeddrawings; in

which a Fig. 1 shows injperspective view one'form of thread extracting device engagingthe chain-loop of an idle stitch;

Fig. 2 shows in perspective view another form of thread extracting device engaging the looped interconnecting thread leading from a tight stitch;

HFig. 3.is a detailperspective view of the firstform of thread extracting device;

' Fig. 3a shows the manner in which the wedge-shaped nose of a double hooked thread extracting deviceenters the loop of.

a chain loop stitch;

Figs. 4 to 7 illustrate intermediate stages in the engagement of thethread extracting stitch.

Fig. 12 is a' similar detail view showing the extraction of a severed looped thread which leads from a tight stitch, and

Fig.13isja perspective detailview of a further form of the thread extracting device.

Referring more particularly to Figs. 1

and 2"it will 'be' seen that the operation to be performed by themethod of this invention is as follows 13 represents part of a continuously stitchedbook-pad and between the adjacent books a and b of the book-pad the interconnecting thread m is severed, e. g. at m. The

severed thread, however, stillhangs in the chain-loop y and the book a can be removed from the book-pad B only by the withtomove at this juncture in the direction of drawal of the'severed thread w through the chain-loop 3/ and from around the chain loop a.

cording to theimethod of the present invention isto engagetheloop a with-a thread extracting device E or E so that during the normal progression of the book-pad the loop a is spread out to an increasing extent'to effect the automatic withdrawal of the severed thread as as desired. Y I Asshown in, Fig. 3 in one practical form each thread extracting device E comprises two substantially horizontal hooked shafts 15, 16 mounted at one extremity on a com mon support and inclined one to the other in the form of a' wedge the apex of-which' is formed by the hooked portions of the said shafts. The shafts 15, 16 are set preferably parallel to the stitched back of the book-pad and have their hooked extremities lightly touching at a common, point to form a nose-'19."

foremost extending The hooked extremity of each shaft, both of which are slightly resilient, is formed by upwardly curving the free end of the shaft and then providing at the uppermost point thereof anoutwardly and obliquely extending wing or horn 17 or 18. I

Means such as hereinafter described are provided for reciprocating the. thread extracting device E longitudinally.

Referring to Figs. 8 and 9, means are indi cated for producing a book-pad continuously stitched with chain-loop stitches.

The signatures 10 are placed on the pivotal support 12 and thereby brought beneath the stitching needles 13,13a where in known manner and with the I aid of additional stitch forming mechanism (not shown) they v are stitched with chain-loop stitches and added to the previously stitched portion of the book B. i

To the extent to which newly stitched signatures are added to the book-pad B the latter progresses forward, as will be well understood by those'skilled in the art, and the thread extracting device or devices E is or are caused to engage theilooped interconnecting threads of the terminal stitches of the adjacent books of the book-pad or s the idle stitches formed therebetween as shown in Figs land 2. I

' Themanner in which the thread loop formed for example in this manner is engaged by the thread extracting device is shown more clearly in Figs. 3a to 7 When an idle stitch has been formed after the terminal stitch of a book, Fig. 4, the thread; looping needle 13 is raised and sus pended therefrom is the thread loop .2 extending from which is the interconnecting thread w leading to the thread sewing needle 13a. Y

The thread extracting device E istimed the arrow A so that the nose 19 of the device a V j I E penetrates the loop 2, Fig. 3a, andpasse's One manner. of achieving this result actherethrough as shown in Figs. 3a and 5.

By this movement, as shown clearly in Fig. V

3a, the, obliquely extendingfwings or horns 17, 18 "press-upon 'the'thread limbs ofth'e:

loop a which thereupon open outwardly and then close behind'the horns. r p

- The loop a is thus trapped or hooked by thehorns of the thread extracting device E so that when the latter is retracted in the completion of its reciprocatory movement the thread loop 2, still held by the hooked "needle 13, is drawn forwards intermediate its length as shown'in Fig. 6.

,In the normal course of stitching the next signatureof the book-pad (the first signa-v ture of the subsequent book) the hooked needle 13 carries the threaddoop 2 downwards to engage the-loop formed stitch.

. The downward pull on thethread loop e a of the next causes the threads thereof to pass into the V shaped recess formed by the inner sides of the oblique horns 17, 18 andbear upon the moved along the outwardly diverging shafts of the thread extracting device E and thus is'spread so that the thead w to be extracted is placed under tension.

At an appropriate instant the thread wjissevered at a point intermediate its length, e. F ig's. 10 and 11 the severed thread' aywhich is a continuation of one limb of the constant ly widening loop 2 progressing 'along the' thread extracting deviceE is finally witl 7 drawn from the loop 3/ and passed around theloop 2 thus freeing the book a from-the adjacent book 6 of-the book-padB.

.The'threadw, the extraction of which has been abovedescribed, forms part of an idle stitch. Vhenthe extraction of an interconnecting thread leading from a tight stitch is desired it is preferable to alter somewhat the form of the thread extracting device. j V: j I

.Asshown in Figs. Qand 12'the thread to be extracted is severed at the point m2, i. e. at the cross-over from one book-a to the adjacent book I; of the connecting thread w extending'laterally of; and insidethe book a to be separated. 1 lVhen the loop .2 is engaged by and looped around the thread extracting device, the thread a: to be extracted extends from the righthand side of the loop .2 as viewed in Fig. 12 while the left-hand limb of the loop 2" extends to the stationary thread 003 which latter forms the loop 1 c It is obviously undesirable to exert more than slight tension upon the thread m8 and for this reason in dealing with tight stitched books a thread extracting device E i's-used,

The left-hand shaft 16a ofthe device.E is inset inrelation to its hooked extremity and positioned parallel to the axial line of the thread extractingdevice while the righthand shaft'15a is inclinedv to the axial line as in the arrangement of the device The thread loop is engaged by the wedge-shaped hook nose of the device vE similarly'to the manner described in reference to the device E and the loop when thus engaged and progressed along the shafts of the device E" is spread to the right-hand sideonly (as shown in Fig. 12);. w

Thus the thread .03 is extracted from "the loop 2 with a minimum of tensionuponthe thread 003 whichlatt-er is drawn-sulficiently merely to tighten the loopyupon the thread at 0a, F ig. 10, and as shown clearly in V where the latter emerges from the booka.

f In this case the severed thread :0 will not be withdrawn from around 'the loop z during its progress along the thread extracting device E 'as will be. clear flQI Fig, 12. However, the thread 00, withdrawn from the a loop .y'. and disengaged from the shaft l5ajof' the device E, Will continue to progress along the shaft. 16aas the book-pad progresses and finally meets the rear face 2900 of the holder 29 which serves to support the thread extracting device or devices E or'E. Obviously at this jpoint' the thread 00 looped around thejshaft 166; can no longer progress forward although the book-pad B continues its progression.

end from around the loop a? and finally from around the-shaft 16a of the thread extracting device E thus-freeing the book ajfrom the adjacent book b of the book-pad B.

The book-pad'duringits continued movei ment drawsthe thread'w'around aiguideway constituted by the face 29.of the holder29 and the .rearwardly extending shaft 16w thereby first; extracting the, severed thread:

- From the foregoing description it will V be clear that'although it is preferable to inclinethe shafts of the thread extracting devices in a Wedge-shaped. formationsuch formation of the body of thelthread -ex tracting device is not essential. If the shafts 15, 16 are set parallel behind a wedge:

shaped loop-engaging head as shown in Fig; 13, the device E2 thuszprovided can be lltl- ,lized tocarry. into effect the method of.

thread extraction according "to this inven tion since when the loop {2 of an idle lstitch or tight stitch is progressed along thepar-v allel shaftsit W111 be opened outito lime ited extent and eventuallyabut the face 7 29a of the holder 29 and during the continned progress of the'bookpad thesevered thread 00 will be withdrawnas, above described.

a It is .desirableto carry outthefi method'of thisginvention in a fully automatic manner and one varrangement "of mechanism for this purpose is shown in Fig. .9.

The pivotal stitching saddle. is pros vided adjacent its apex with a slotted recess 23 which latter when in the stitching position and not covered by. an opened'signatureisadapted to receive the.downwardlyv extending arm 2% ofa bell-crank lever shaft 26extending above and transversely i of the stitching position of the pivotal stitching saddle 12 and "parallel to'a needle guide 33 whichforms partof the known: i

thread stitching means. The second 'arm' .25 ofthe bell-crank leverextendsinwardly towardsthejmachinesand has its free exward y Curved. to form a nose which latter is mounted on a rotatable h ture the arm 24 rests upon the signature since by reason of the latter it is prevented from entering .the slot'23.

A horizontal shaft orshafts 34 set at" right angles to the needle guide 33 and supported approximately at the same level in the machine frame (not shown) has or have slidably. mounted thereon a sleeve or sleeves to the underpart of-which is at tached a holder bar 29 set parallel to the needle bar 33. One or more thread ex tracting'devices E or E2 are firmly secured.

to the'holder bar 29 to project at right =angles thereto with their free hooked extremities in alignment withand normally slightly in front of the thread loops suspended from the appropriate hooked lo'opin'g needles 13.

A rocking arm 32, pivoted intermediate 'its length in the machine frame: (not shown) on'a transverse stub shaft 32a, is pivotally connected at its upper extremity to the sleeve35 and carries-at its lower extremity a canrfollower which is'urged by the helical tension spring 36 to engage thecam37 (the latter also being; mo-unted in the machine frame)" r stitched book-pad provided 7 A* locking lever 28 pivoted at one BX;

tremity in the rear of theholder bar 29 ex- 'tendsforw ardly beneath the said holder bar and nose 25a of the crank arm 25 as shown in fulllinesin Fig. 9. Intermediate the length of the lever 28 an upwardly extending lug 28a is provided in .the proper position to engage the face 29a: of "the holder bar 29. A' helical tension spring 27 an chored at one extremity to the needle bar '33 and secured at its further extremity to the lever 28 serves to hold the lug 28a in engagement with the holder bar 29.

' Fixedly mounted on theshaft 26 in addition to the bell-crank 1ever 24,' 25 and offset'to one side of the saddle 12'is a curved; downwardly extending finger 30. which in the absence'of' a signature on the saddle 12 assumes an approximately downward position by reason of thenatural position of balanceof the shaft 26. -When so POST-1 tioned its lower extremity enters-the arcuate path of-travel of an abutment or cam vmember 31 securely mounted on the stitching saddle12.

During the stitching of a continuously with idle stitches interposed between. the adjacent books of the pad "the operation "of the above described mechanism is as'follows: 1

"Assuming that the foremost book aof the book-pad B' is completed by the'stitch ing of the book-signature a shown on the stitching'saddle12 in Fig. 9 thefollowing stitch or row of stitches will. be an; idle stitch or stitches and during this stitch forming, operation the pivotal sheet carrien 12 will swing forward into the stitching.

without carrying a signature position Consequently the arm 24, under thereon.

the weight of the bell-crank lever will drop into the. recess 23 thus rocking the arm 25 into contact with the spring-held locking lever 28' as shown in chain-dotted lines in Fig. 9. The movement of' the bell-crank lever 24, 25 rotates the shaft 26 thus rock'- ing the finger 30 into the path of the abutment 31 as abovedescribed. f

When the idle stitch is formed,'as shown 7 in-Fig. 4,' the stitching saddle 12 swings away from the book-pad and in this move. ment the abutment 31 encounters the down- 'wardly extending finger 30 which is rocked in the direction of the arrow' C until its lower extremity lifts clear of the'abutment 31. c This additional positively urged rock: ing movement of the shaft' 26 causes the nose 25a of the lever 25 to press the'lever- 28 I downwards against the pull of the spring 27 The lug 28a is so tripped 'out of the'path of the holder bar'29 and under the urge of the spri'ng'36, the slide member 35, holder bar 29 and thread extracting 'devices E or'E2 are moved rearward to the extent permitted the throw of the cam 37. In the rearward movement of the thread extracting devices E orE2 the thread loops a: are engaged asabove describedand immediately. this engagement is effected thethrow of the cam 37 causes thedevice E or E2"-'and threads held-thereby t be retracted. w I o The devices'E or E2 are again. locked in the retracted position by means of the spring-urged engagement of the lug "28a with the face 29a of the. bar 29 until release consequent upon the formation of the next idle stitch or row of such stitches.

Instead of the arrangement ciprocatory movement of the thread extractingfdevices, a counting mechanism or the like driven from the machine driveinay be utilized or alternatively the attendant may control the impulse of the actuating gmechanism. 1

i Such controlling devices as those last menabove de-' scribed'for automatically controllingthe re;- p

tioned will be necessary if an idle stitch is not present in the book-pad in which case with advantage. I

The sequence of thread severance and ex traction is in no way limited to-Lthat above described while any suitable form of thread extracting device or actuating mechanism the thread extracting device Ej may be used Q which includes positively engaging a looped thread length with a thread-guiding device and thereby guiding the thread length so that by the normal progression of the stitched book-pad the thread length after the severance thereof is caused to Withdraw from the adjacent interdepending thread loop.

l 2. A method of extracting the severed interconnecting threads of a stitched book-pad from the loops of the adjacent stitches, which includes positivelyengaging a thread length 7 with a thread guiding device and causing the thread length to loop around said thread guiding device so that by the normal progression of the stitched book-pad the thread loop after the severance thereof is caused to travel around the thread guiding device and is thusextracted from the interdepending thread loop. 7 3; A method of extracting the severed interconnecting threads of a stitched bool'r-pad from the loops of the adjacent stitches, which includes positively engaging" with a wedgeshaped thread guiding and extracting device the thread length to be extracted and causing the thread length to, loop around said thread extracting device so that bythe subsequent progression of the looped thread along said wedge-shaped extracting device the thread loop is distended and the thread length when severed is" withdrawn from the interdepending thread loop. 7 r

4. Means for extracting-the severed interconnecting threads of a stitched book-pad from the loops of the adjacent stitches, including-a threadguiding device, means for causing said device to enter anddist'end a thread loop,- and means for'retaining said thread'loop upon said device so that thenormal' progression of thebook-pad causes the thread loop 'aftertheseverance thereof to move relatively to said device and withdraw the severed thread length from the inter depending threadloop. a 5'. Means for extracting the severed interconnecting threads of ailstitched book-pad from the loops of the adjacent stitches, incl-uding'a thread guiding and extracting. device comprising thread engaging members arranged to provide a wedge-shapedfnose adapted to enter athread loop andsegregate the limbs thereof, and means forretaining said thread limbs'in engagement with'said thread engaging members so that during the arranged in wedge-shaped formatiomjmeans for engaging a looped thread length'upon the converging extremities of said members,

a thread length,- a normal progression of the bookd and master reamin an looped thread:

length upon said threadengaging members so that during the normal progression of the stitched book-pad the looped thread length i so engagedis distended and wh'en severed passes around" said members to withdraw from an interdepending threadloop.

r 7. Means forextractmg the severed inter- 5 connecting threads lore stitched book pad from the loops of- -tlie'adjacent stitches, in-] cluding a thread guiding and extracting device which comprises two thread engaging 7 members one of which is arranged substantially parallel to the vertical plane of the book-padwhile the other divergesthe'refrom at an angle, means for engagingup'on the converging extremities of'said members a;

looped thread length','andm eans for retain 7 ing said looped thread lengthj upon; said members so that b'y the normal progression of the stitched book-padfthe loopedtliread length is caused to pass around 'sj'aid' mem I I bers to withdraw from the interdepending thread loop. 4 e a s 8. Means for extractingithe severed inter-v connecting; threads of a stitched book-pad j from the loops of the adj acent stitches, in

eluding a thread guidingand extracting device which comprises two thread engaging members having their 7 outer lateral edges substantially; paralleland arranged'longi tudinally of the book-pad, a, wedge-shaped when-severed is causedto travelaround said members to withdraw from theinterdepen'd i'ng' thread'loopj g r an thread guidingand extracting'device a comprising a carrier extendingtransversely of. asti't'chedbook-pad, two relatively" inclined shafts; secured at 'on'e extremity -to ties converging to' form a wedge-shaped saidflshafts to' retain "ther on the floop'ed lOJA'thread'guiding and extractingde ,i i

vice'comprising a carrier, two's'hafts secured to said carrier, and extending longitudinally of a moving, stitched bookepad, said shafts being relativelyinclined and-havingytheir free extremities upturned and c'onverging' asform's nose, obliquely setjhorns projecting from said nose, and means formovingff'sa'id shafts so that't-hejnose thereof engages a looped thread {length leadingfrom said said carrier and having their free extremi i is - 1 terconnecting; threads of astitched bookbook-pad thelimbs otwhich thread loop become lodged behind said horns andthereby retained on said shafts until progressed along the latter. r ;v 11. A thread guiding and extracting device comprising a carrier, ,twoshafts secured to said carrier and extending longitudinally ofQa moving, stitched book-pad, one of said shafts being parallel to, the-direction of movement; of said book-pad and the other inclined thereto so that the free extremities ofsaid shafts converge to form awedge- Zshapednose, and thread retaining horns obliquely. projecting from the converging extremities of saidshaftsi, v I v 1 12. Ajthread guiding and extracting device comprising a carrier, twoshafts secured tosaid carrier, and extending longitudinally 'ofa moving stitchedbo'ok-padparallel to the ::directionof movement thereof, both shafts having their free-extremities inwardly and upwardly inclined to form a nose, and thread retaining-horns obliquely projecting from said free ha I extremities of the I3.=A thread guiding extracting de- "vice comprising. a carrier, two resilient shafts secured at one extremity to said car- ;rier and havingtheir free extremities converging andin mutual contact to form a wedge-shaped nose, and thread retaining horns projecting fromsaid converging shaft-extremities.

14. Means for extracting the severed inpad from' -the loops of theadjacent stitches, including a reciprocatorycarrier, two resilient shafts secured at, one extremity to said carrier and having theirjfree extremities sconvergingto form afnose, thread retaining horns-projecting from said converging shaft extremities, means for imparting reciprocatory movement to said carrier,

andmea-ns for timing said movement .in

', relationto the bookstitching operations.

15. Means for extracting theseVered in: terconnecting threads 1 of a stitched bookpad from the loops of the'adjacenustitches, includingfa reciprocatory carrier, two re:

silient shafts secured at one extremity to said carrier and having their free extrem1-.

ties converging and in mutual contact to form a wedge-shaped nose, thread retaining horns v projecting obliquely from a said contacting shaft extremities, -m eans for I imparting movement to said carrier so that the nose formed by said thread engaging members engages ,a thread loop the limbs of which are parted,:. engaged by saidhorns and pass between the contacting shaft ex-A tremities, and means-for; timing themovement of said carrier in accordance with the i v stitching of the book-pad. V

16.,In a stitching machine adapted to pro:

' duce-acontinuously stitched boolnpad, a

sheet, stitching support, thread, stitching needles associated with said stitching sup-i port, a carrier arranged to move longitudi: nally of the book-pad as thelatter is progressed from said stitching needles, two i thread guiding and extracting shafts ,secured at one extremity to said carrier and converging to contact at their free extremi-'. ties to form a wedge-shaped nose-which is positioned above said book-pad, means for imparting movement to said carrier so hers is, interposed between the limbs of a thread loop extending from saidvbook-pad to said stitching needles, and means for timing the operative movement of said threadguiding membersin accordance with the formation of the book-pad.

17. Ina stitching machine adapted to'produce a continuously stitched book-pad, ,a sheet stitching support, thread stitching needles associated with said stitchingsupthat the nose of said thread guiding memport, a horizontal needle guide extending transverselyof the machine, supporting shafts secured at one extremity to. said needle guide and extendinglongitudinally of said machine, sleeve members slidaby' mounted, I i

"having at itsfurther extremity a cam follower adapted to engage saidcam-;whereby reciprocatory movement is impartedto said carrier bar and thread guiding members so that the nose of the latter is caused to enter a thread loop extending from the book-pad to a stitching needle, and means fortiming the movement of said .thread engagingmem-r beizis relatively to the formationof said book 18. In a stitching machine adapted topro: duce a continuously V. stitchedIbook-pad, a pivotal stitching saddle having its apex slotted, thread stitchingv needles associated with said stitching saddle, a carrier bar arranged to move longitudinally of the book pad as the latter is; progressed fromsaid i stitching needles, thread guiding and extracting members secured to said carrierb-ar and adapted when moved tO-Qengage the loop of an idle stitch-extending vfrom the bookpad and held-by a stitching'needle, means for imparting reciproeatory movement to said carrier bar and said thread guiding for blocking said movement, means for tripping said blocking means tojrelease to members for the purpose set forth, means v movement said carrier bar, and means for actuatmg said tripping means by the movement of said stitching saddle duringthe forfixedly mounted upon said shaft and p.

mation of said idle stitch.

19. Thread guiding and extracting meansas claimed in claim 18, in which the means for timing and controlling the movement of the-carrier bar comprise a pivotal locking lever having a shoulder adapted to engage and hold from movement said carrier bar, a freely rotatable shaft positioned adjacent the stitching position of the stitching saddle, a bell crank lever fixedly mounted on said shaft so that one arm thereof registers with a slot in the apex of said stitching saddle and the other arm is adapted to engage said'pivotal locking lever, an abutment carried by said stitching saddle, a finger adapted to move into the path of said abutment when permitted to do so by'the entry of the bell crank arm into the slot in said stitching saddle and for the purpose set forth. y

In testimony whereof I aflix my signature.

OSCAR KLEIN SCHMIT.

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