US1519299A - Stitching mechanism for mattress-roll-forming machines - Google Patents

Description

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3 @HKJLL STITCBING MECHANISM FOR MATTRESS ROLL FORMUJG MACHINES Filed July 18, 1922 Q 14 Sheets-Sheet 1 J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18', 1922 14 Sheets-Sheet 2 J. W, DROLL swmcmue MECHANISM FOR- MATTRESS ROLL FORMING MACHINES Filed J ly 18, 1922 l Sheets-Sheet 5 Dec- J- W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18, 1922 14Sheets-Sheec 4 J. w. DROLL STITGHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18: 1922 14 Shets-Sheet 5 i g: Q

J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES l Sheets-sheet 6 Filed July 18, 1922 J. N. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES 2 2 9 1 8 1 Y 1 H J 6 e 1 1 F Dec; 16. 1924.. 1,5192% J.- w. DROLL s'M'rcnING MECHMIIIISM FQR- MATTRESS ROLL FORMING MACHINES.

' Filed Jul '18', 1922. l4'Sheets-Sheet 8 llllllg Dec; 16, H

r J. DROLL -STITCHING MECHANISM FOR MATTRESS ROLL ORMIIQG MACHINES Filed July 18, 1922 14 Sheets-Sheet 9 121mm Z M AWN mmN QMN MNN v J. w. DROLL STITCHING MECHANISM FOR MATTRES ROLL FORMING MACHINES Filed July 18; 1922 14 S heetsfisheet l0 Dec, 16, 1

J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18, 1922 4 SheetS-Sheet Dec. 9 1,519,299

J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18, 1922 14 Sheets-Sheet 12 -Dec. 1 4. 1,519,299

' J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18, 1922 14 Sheets-Sheet 15 J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES Filed July 18 1922 14 Sheets-Sheet 1 4 Patented Dec. is; 1924.

. UNITED S T S- P l E -O C Jw DBOLIJ, CHICAGO, fiJLINOIS, f I

. stitchin AssIsnoR To DROLL rerrmrs conromrron or DELA ARE, A conronarron or DELAWARE.

srlrcnnie rtncl'mnrsm 'roa mamaEss-no L-roamme- MACHINES.

To all whom it 4 Be it known that I. JosnrirW. DnoLL, a citizen of-the United States, residing in the city of Chicago, county of Cook, and State of Illinois,.have invented a new and useful Improvementin a Stitching Mechanism for -Mattress-Roll-Forming}Machines, of which the :Eollo'wing is a specification.

My invention' relates to improvements in mattress Stitching machines and the likeand is particularly directed :to an improved single t read. lock stitch forsewing; a roll upon the edge of a mattress or other piece 5 of upholstery.

provide an improved machine for sewing a roll edgeupon mattresses'and the like.

Another object is to provide an improved sewing mechanism wherein a sewing needle and ashuttle. are actuated in timed relation to form a lock stitch from a single thread.

A further object is to provide an improved sewing needle and actuating mechanism therefor to permit the alternate engaging and disengaging of a single thread to-form where y a continuous series thread while the stitches through the edge of a mattress.

Another object is to provide an improved shuttle arranged to dispense a thread to a sewing needle during one portion of the sewing operation and to disengage said thread from the needle and lock the stitch -'durin another portion of the operation of locked stitches may be formed from a single sewing thread.-

A further object is to provide an improved needle having means for opening the eye thereof at predetermined moments to engage and disengage the thread and to close said eye to prevent disengagement with the through the mattress.

A still further object is to provide an improved thread dispensing means whereby thread may be played out andslack taken up in timed relation-with the movements of form stitch.

the sewing elementsto insure a firmand uni- A still further objectis to provide' in imthe' stitching mechanism alongthe edge of a mechanism arranged to makexa The primary object of my invention'is to Q thread is being drawn I -App1icat1on filed July 18, 1922. Serial no. 575,812.

mattress to -form; successive -stitches there through. p v

Further objects are to provide for verti-- -cal and pivotal adjustment of the stitching mechanism relative to the edge of the mattress whereby the same may be adapted to dilfere'nt thicknesses and grades of work.

I accomplish these'and-other objects by means of the device disclosed in the draw ings forming a part ofthe present specifica-. tion wherein like characters of reference are said;- specification and drawings and in which:

mounted upon amattrss supporting table. Fig. .2 is an elevation showing the machine as viewed-from the right hand'side of.

Fig. 1. viewed from the left hand side of Fig. 1.

the 'roll forming means in operative positionv and the needle receded after the first ad'- Vance.

Fig. 6 is a similar viewshowing the needle advancedthe secondtime.

Fig. 1 is a broken side elevation bi my improved mattress. stitchingmachine as Fig; 3 is an elevation of the machine as? Fig. 7 is a horizontal section showing the ,movement of the needle from the starting position as shown inlfnll lines to the first advance as shown in dotted lines.

Fig. 8 is a similar view showing the needle receded after the first advance, and in dotted linesshowing the pivotal shifting of the needle prior to the second advance.

Fig. 9' is a similar 'view showing the needle being advanced the second time.

Fig. 10 is an enlarged detail partly in section of the needle and its mounting.

Fig. 11 is-an enlarged detail showing-the manner in which the thread is engaged during the first advance'of the needle.

Fig. 12 is an enlarged broken transverse sectional detail taken upon the line 12-.l2 of Fig. 9 in the direction indicated, the

used to designate similar parts throughout o5 broken through the shuttle housing, the shuttle be hand side of Fig. being shown in advance of the sewing needl showing the thread needle being shown in position for the second advance.

Fig. 13 is an enlarged broken transverse section of the head viewed from the right 2, the operating elements the startingposition. I Fig. leis a similar view, portions being away to show the first movement-o the shuttle actuating mechanism.

Fig. 15 is a similar view showing the shuttle actuating means in a subsequent position.

Figs. 16 and 17 are broken front elevations of the headshowin'g the actuating gears for the thread dispensing member and the outer shuttle member respectively.

Fi 18 is an enlarged transverse section ing shown in the position prior to the sec ond advance of the sewing needle.

- i 19 is a similar view showing the shuttle partially rotated after the second Fig. is a longitudinal section of the shuttle.

Fig. 21 is a section similar to Fig. 20 dispensing member in elevation in a partially rotated position.

Fig. 22 is a side elevation of Fig. 21, parts being broken away and shown in section. 4

Fig.2?) is an enlarged broken front elevation of a portion of the machine showing the means by which the machine is moved along the edge of the mattress and supporting table.

Fig. 24'i's a the line 2 i24= of Fig. 23

indicated.

Fi is a sectional detail taken upon the line XX of Fig. 23 in the direction indicated. I

' Fig. 26 is a in the direction horizontal'section similar to that shown in Figs. 7, 8 and 9, the position of the machine at the end of the secon receding of the needle .being shown in full lines and the followin movement of the machine .and the needle being shown. in dot-ted lines.

Fig. 27 is a broken section of a portion of a mattress showing the manner in which the stitches are formed through the edge to secure the roll.

Referring to the drawings it will be seen that my improved machine consists of a supporting'frame 1 carried by suitable casters 2 mounted thereon and engaging achannel track 3 secured upon thesides of a work supporting table 4, said frame 1 being guided by upper guide rollers 6 enga ing the channel track 3 and lower guide r0 lers 7 and 8 engaging opposite sides of a channel guide 9 upon the lower portion of table supporting legs 11.

A frame 12 is slidablysecured upon the pinion 18 being in turn The lower. end of I feathered into a sleeve 26.carr1ed at its horizontal section taken upon 'upon the corresponding end f clination of the head, 13 relativev to said table.

Within the ed ai cam 14 upon a'shaft 16, said cam 14 being provided withgear teeth 17 upon the periphery thereof. The cam 14 is driven by a pinion 18 mounted upon a shaft 19 and meshing with the teeth 17 of the cam; the driven by a-bevel gear 21 secured upon the upper end-of a drive shaft 22 and meshing with abevel gear 23 secured upon the adjacentend of said pinion 18. The drive shaft 22 is mounted at its upper end within a bearing 24 pivotally supported upon the shaft 19. the drive shaft 22 is lower end within a bearing 27 pivotally mounted upon a shaft 28. A bevel gear 29 secured upon the lower end of the sleeve 26 is drivenby a corresponding bevel gear secured upon the shaft 28. The shaft 28 is driven by a motor upon the lower portion of the frame 12 and connected to the shaft 28 by means of a belt 33 mounted over a. suitable pulley 31 mounted upon the outer'end of the shaft 28. Suitable transmission gears, 36 are mounted in connection with the shaft 28 to obtain a variable speed transmission, but as this construction forms no part of the present, invention and has been made the subject of a co-pending application Serial Number 575,814, filed July 18, 1922, in which itis. fully described, no further description need herein be included.

A roll shaping element is mounted upon d the under side of-the head 18 adjacent the edge of the table 4 to receive the edge of a mattress M supported thereon, a roll edge being formed upon the edge of the mattress by means of a pair of packing needles 37 slidably mounted within-guides 38 pivotally mounted upon the head 13' adjacent the shaper element 35. The packing needles 3? are actuated bynicans of links -10 connected between the needles 37 and actuating arms 39 secured upon shafts 41. The arm 39 actuating one needle 37 is provided with teeth head 13 is rotatablvmount- 32 adj ustably secured 42 upon the end remote from the link' 40.

said teeth 42 meshing with similar teeth of the arm 39 actuating the other needle 37. are operated by means of a lever 43 secured upon the toothed portion of one of the arms. and carrying a roller 44. engaging a groove 46 upon the cam 14E,'whereb "said arms are moved simultaneously The arms .39 1

to force the needles 1 be moved'tothe position shown in 37 downwardly front th a position as shown in Fig; and top of the mattress M are then moved pivotally ing the cam thus causing the needles 37 to thereby causing a portion of'the .stufling within'the' mattress .to be gathered and forced into the corner of the mattress within the shaping element 35,-to form a roll,-the

forming'and shapingflthe roll. Asthe, roll forming andshapmg means forms no part of the present invention and is fully described; in a copending application, Serial No. 575,813, filed July 18 1 922, a detailed description of the construction and operation of the sameis omitted herefrom.

When the roll has been formed in the manner above briefly described it is permanently secured by means of stitches made'by means of a sewing needle 51 one end of which is I t 6 and 9 of the draw ngs after which a Sillll" removably secured "to a block 52*s1idably mounted upon-a guide 53 'pivotally' mounted as at 50 upon the head-13fof;the, machine.

The block 52 isprovided-with an'extension P 54 upon .the outer side thereo'fwhich carries P shaping element 35 by the packing needles :1 flexible coupling 56 engaging a slot57vin one end of a lever 58 the other end of which is pivoted upon a shaft 59 secured within the head 13. The lever 58 isactuatedto ad- -vanceand recede the block 52 and the needle 51 along the'guide 53 by means of an arm 61 pivotally connected at one end thereof to the lever 58, the other end of said arm61 being provided with a slot 62 slidably engaging a guide 63 pivotally mounted upon the cam supporting shaft 16. Aroller 64 is mounted upon the arm 61 to engage a groove 66 formed in the adjacent side ofthe cam 1a whereby the desired movement is'imparted to the arm 61 and lever 58. The

lever 58 is hinged as at 6.0 to accommodate the transverse movement of the needle.

A second groove 67 is formed inthe side of the cam 14 to engage a roller 68 mounted upon one end of a bell crank 69 pivotally mounted upon a shaft 71 secured within the head 13, the other end of said crank 69 being connected by a link 72 to a lever 73 which is in turn connected by a link 74: toa block 76 slidably mounted for transverse movement. The block 76 is secured upon the free end of the pivotally mounted guide 53 and is'apertured to receive and form a guide for the needle 51.

The needle is normally held in its extreme receded position while the roller 64: is engaged by that portion of the cam groove 66 which is most remote from the center of the cam. As the cam is rotated from the startas- 56f links 1 -4-.7 actuated by suitable connections engag-f' 4 of the drawings that the needle is maintained its no; 1; receded position for a consid'; rable por t ond the rotatiomthepontour of the groove'l then causing theroller; 4"jt'0 benioved toward the center of'the' can; thereby causing the arm.61 to bemoved along the guide 63 and the-lever- 58 swung 'about'its' *ivot 59 to the position shown in dotted ines, continued rotation of thecam causing 'm'al receded' position as shown in Fig.- 5.

67 thereby moving the bell crank 69 about its pivot. which movement is communicated through the link 7 2, lever 73 and link 7 4 to 'the'block 76, thereby causing said'block to a second-timeto the position shown'in F gs.

osition; Each advance causes theneedle to en'etrate through the roll formed within the 37,the second penetration, however, being at apoint'slightly spaced-from the point of the first penetration,- the object of which will hereinatterbe more fully explained.

. Theneedle 51 is provided at its forward end with an eye hereinafter described. The other end of the needle is threaded into a member 201 mounted within the upper 'portion of the block 52 and removably-secured therein by a locking member 202 slidably mounted within an extension 203 of the bloc-1:52, said member 202 being normally depressed by a spring 204 to engage a notch 205 formed upon the upper side of the member 201, "whereby said member'is normally.

locked in its operative position. The for;

ward end. of the me her-'201'is beveled as at 206 to facilitate the introduction of the member into engagement with the locking member. The rearward end extends outwardly through an aperture 207 in the frame 13 and is knurled as at 208 to. ermit the member to be readily turned su ciently to lift the locking member-when it is desired to remove the needle.

The member 201 is provided with a longitudinal bore 209 adapted to receive 2 plunger 211 slidably mounted therein an carrying a rod 212 extending through lillt forward end of the member 201 and into 2 longitudinal groove 213 formed upon thr lower side of the needle 51, said rodextend ing to the point of the needle to close th\ of the cam'causes the needleito be advanced.

- the several parts to be returned jtothe'nor- As the. needle approaches the receded po- ,sition' after the above; described advance the roller 68 is moved outwardly bythe groove.

"further rotation causes the needle to be're- I coded and shifted to the normal starting cured upon the plunger parallel to the rod 212 and extending outwardly from'the forward end ofthe member 201 below the needle 51, for reciprocating the plunger and the rod 212 relatively-to the needle.

A rocker arin 217 is pivotally mounted upon a lug 218 formed upon the-frame 13, saidrocker arm having one end thereof forked to engage a pin 219 secured upon the'block 76 whereby the rocker arm is prevented.

oscillated to more the free end 221 into alignment with the actuatin rod 216 when the needle is in osition for t u: first advance,

and'out of sai ilignment when the needle is moved to'its position for the second advance. The free end .221 is preferably forked to span the needle 51 to insure against vertical displacement when the rod 216-is' moved tliereagainst during the first advance of the needle to open the eye as hereinafter described.

A shuttle designated in general by the numeral 81 is mounted within a siuttle housing 82 formed within the lower portion.

of the head adjacent a the shaper element 35 upon the side opposite the needle 51. The shuttle 81 consists of an inner shuttle member 83within which is mounted a bobbin 81 upon 'wlii'ch is wound a suitable length of sewing thread 86. An outer shuttle member 87' including a gear portion 88 is rotatably mounted upon the innershutt le member 83. A thread dispensing member-89 provided with a gear portion 91 is mounted upon the inner'shut-tle member 83 and isadapted for independent rotation relative to both the inner and outer shuttle members. The preferred construction of the shuttle 81 is fully disclosed in Figs. 20 and 21 of the drawings. The members 83, 87 and 89 are held in assembled relation by means of a member 92 threaded between the inner shuttle member 83 and a retaining ring 93, said member 92 being longitudinally apertured to reeeive'the thread 86 and provided with an outwardly extending portion 91 'arranged to loosely engage a corresponding opening 96 in the shuttle housing 82, whereby rotation of theiniier shuttle member is The thread 86 wound upon the bobbin 81 is dispensed therefrom through an aperture 97 between the inner and outer shuttle member, said thread being passed under a spring 98 mounted upon the outer end of the inner shuttle member 83 and arranged to maintain a slight tension upon the thread.

The inner shuttle member 83 is provided with upon a shaft an outwardly disposed lug 99 having an aperture 101 threthrough aligned with an aperture 102 in the outer end of tlte shutthe member 83'and also aligned with an aperture .103 formed through the retaining ring 93 which aperture 103 coinriiunicates'with the aperture through the nieiirbgifizs T he thread dispensing member, 89 is pi'ovided with a pair of inwardly extending lugs 104 arranged to span the lug 99 and having apertures 106 corresponding to the aperture 101 therethroughu: The thread 86 -is-earried from thespring 98 through the aperture 102, the apertures 106 and aperture 161, and thence through the aperture and the member' 92 as shown in Fig. of the drawings. From the member 92 the thread is carried past raised portions 107 and 108 formed upon a plate/109 between the shuttle housing 82 and the roll shaper element and thence under a spring 111 to' the mattress roll, as best shown in Fig. 11 of the drawings, said spring 111 serriiig to maintain a slight tension upon the thread.

Thc thread dispensing member 89 is actuated through the gear portion 91 by means of a gear 112 inoimted upon a shaft 113 and carry ng a pinion 114 connected thereto, said pinion being driven by agear 116 mounted 117. The gear 116 has a gear 11.;- connectedthereto which gear llii is driren by a. .gear 119, mounted upon a shaft 121. The gear 119.is connected with av gear 122 which is engaged by a rack 123 arranged to be; rec-iprocated by means of a lever 124 to one end of which the 'rack 123 is pivot ally secured. The lever 124 is pivotallv ll'ifillllld upon the cam supporting shaft 16 and is connected by a link 126 and arm 127 pivotally mounted at one end thereof upon ashaft 128 and carrying a roller 129 at the other end which roller engages a groove 131 upon the adjacent side of the cam 14 whereby said arm is oscillated.

The outer shuttle'nieiiibcr 87 is actuated in a. similar manner by means of a pair of pinions 132 meshing with the gear portion 88 of said shuttle iiieinbci'. The. pinioiis 132 are driven siinultaneouslv by a gear 133 mount-ed upon the shaft 117. one of the pin ions 132'being mounted upon the shaft 118 and the other uponfa' shaft 134. The gear 13 has a gear 136 connected thereto. said gear 136 being driven by a gear 187 mounted upon the shaft 121 and having a gear 138 connected thereto. The gear 138 is engaged by a rack 139 meshing therewith and arranged to be recipi'oca-ted by iiieans'of a lever 111, pivotally mounted upon the shaft 16 and to one end of which the rack pivotallyconnected by means of a link 142. The other end of the lever 141. is pivotally connected toaii arm 143 by means of a link 144,, said arm l lti being pivotally mounted 35' 4 between the: shuttle and the spring 111.

closed by the.

lation to the from becoming close the opening151 and prevent the thread disengaged from the needle drawn throughthe needle.

as the thread is- Simultaneously with the receding. of the Ring-"111p the thread, the

needle afterpic thread dispensingfmember 89 is rotated by the action of the cam groove 131 upon the form-stitch through the roll .formed upon It; the edge, f the-mattress M inthe'following manner; Assuming the shuttle properly 'threadedl'andithe machine in operative engagement with the mattress, the roll .being Fig; 11 of the; drawings.

"'4 will by virtue 0 formed and-temporarily held by the pack? 'ing-needle 37, rotation of the cam 14 from thelnormal startin I the groove 66 engaging the roller 64',- cause vanced- -to the positionshown in. dottedlines inFigs, {Land 7,, and in full lines in I The point ofthe needle 5.1.is forced through the mattress roll and thereafter passes between the twolraised portions 107 and 108-upon the plate 109,

and in ,so doing the tapered point of the p'ositionshown in Fig.

the needle to be first adneedle passes over and slightly depre'sses the thread 186 which is maintained taut between ;-the shuttle 81 and the spring 111.

Upon the under side-of-the needle point is .fornied an angularly disposed opening 151 communicating with a slot 152 formed through the needle near the .point and constituting the eye of the needle, the inclination of the opening 151 corresponding to the angle at which the thread 86'extends The opening 151 is normally forward/end of the'rod 212,'which, as above explained, is disposed. within a. groove is moved against formed in the lower side of the needle and extending past A, needle approaches-the end of the forward the end 221 of the rocker arm 217, and the plun er 211 and the rods 216 and 212 arreste 'The forward movement of the needle' itself however continues for a short distance, the plunger being moved into the bore 209 against the pressure of the spring 214 and the rod 212 moved along the groove.

213-until the end of the rod 212 clears the opening-151 and thus opens the eye of the needle. In this manner, as the needle approaches its extreme forward position, the thread is admitted through the opening 151 into the slot 152. As the needle is now replunger ceded by a further rotation of the earn, a loop of the thread will be drawn from the shuttle through the roll ofthe mattress. As the needle is moved rearwardly, the rod 216 is disengaged from the arm 217 and the moved forward to its normal position within the member 201 .by thespring 214, the rod 212 being thus moved to again said opening 151. -As the.

forward movement of the.

arm 127 and -the intermediate connections, to dispense the amount of thread necessary to formthe loop, said amount'of thread having been previously taken up by the thread dispensing-element from the. bobbin 84-. as shown in ig. 21 of the drawings by a rotation of said -thread dispensing element in the reverse direction at the end of the previous. stitch in a mannerhereinaftenmore,

fully explained.

As the needle receded vlrtue of engagement of the groove 67 with 51 approaches the extreme the roller '68 and its oonnections jwiththe' position it is shifted transversely by-- blocl: 76' to the position shown indotted.

lines, in Fig. 8 of the .draWi'ngs- As ,the needle '51 is shifted the thread 86 carried thereby'i's moved'over' the hook 153 which is so positioned as to clear the-end of the needle. during. the shift and having a 'dee pressed end 154 arrange'dto cause the thread to .be carried upwardly thereover intofena thread retaining, shoulder gagement with p 156 as best shownin Figs. 9. and 12 ofthe drawings. The movement of the block- 76 in shifting the needle to position for the second advance imparts a pivotal. move-.

ment to the rocker arni 217 which is enabove explained,v crating to swing'j gaged by the pin 21'9.as said pivotal movement 0 the end 22101112 of the pat .of the needle 51 and the block 52. As the needle. 51 is now' advanced-in the shifted position the'thread ,will be: drawn over the hook 153, the thread movement, the plunger actuating rod 216' dispensing member' 89 bein actuated to continue dispensing the re thread 86. Upon' the secon needle the point is moved to a'fpo'int closely tin pin i ons 132 being .so spaced as to insure enthe edge of the outer shuttle as shown in Fig. 9 of the drawings. As the needle 51 ap roaches the'end of the advance movement, t e actuating rod 216 is moved intoengagement withthe block 7 6 and'theplunger211 and rod 2.1.2 receded relative to the needle in such 'manner as to again open the eye of the. needle by uncovering' the opening 151 in the manner above de scribed.

The outer shuttle member is provided with a thread engaging hook 157 formed by cutaway'a portion of the periphery, the

parallel. .to member 87 gagement of one pinion with the -gear por+ tion 91 while the cut away portion passes the other pinion. The hook 157 is normally ulsite length of advance of the positioned "immediately above the level of.

the needle when advanced in the shifted positlon above described. At the instant the 51 is moved rearwardly, the two movements being so timed as to cause the thread 86 as it is engaged by the hook 157 to be moved engaged by outwardly through the opening 151 and thus become disengaged "from the needle. The rotation of the outer shuttle member 87 is continued, the portionof the loop of thread the hook 157 being thereby carried entirely around the shuttle as shown in Fig. 19 of the drawings, the space between t'he'sh'uttle and the shuttle housing 82 being insufficient to admit the other portion of the loop, not entering the cut away portion formingfthe hook. The space between the extension 94 and the recess 96 in the housing 82 is sufiicient to ermit the loop to pass therethrough, the t over that portion of said thread extending f is feathered into a sleeve 181 connected by read thus being looped from the shuttle tothe mattress. Thread is dispensed by the member 89 until the loop passing over the shuttle has'passed the cen- 'ter thereof after which the direction of Tatation is reversed by action. of the cam groove 131 and the slac thread caused as the loop slips past the shuttle; is taken up and the stitch drawn tight.

The stitch formed is illustrated in Figs. 26 and 27 of the drawings. It will be noted that the loop carried throughthe mattressupon the return movement of the needle after the first advance is given a half twist as it is moved over the hook 153- so that .when the loop is carried through the mattress the'second time and carried around the shuttle a knot is formed. The twisting of the loop is due to the resistance offered by the hook 153 to movement thereover and to the adjustment of the relative tension at op posite ends of the loop. This feature of my invention is important for the reason that by forming each stitch into a knot as shown each stitch is effectually locked and the breakage of the single thread at any point will not effect the other stitches.

.\s the stitch is beingcompleted, the packing needles 37 are actuated by the cam 14-. to disengage the mattress roll and are brou ht back to the normal sta'rting'position. mmediately thereafter the entire machine is advanced along the edge to the mattress into position for making a succeeding stitch.

The forward movement of the machine is accomplished briefly as follows: A sector gear 161 piv'otally mounted upon the shaft 146 is arranged to be oscillated by alink 162 connected to one end of a lever 163-piv'- pivotally otally connected at the other end thereof to acrank 164 and arranged to he moved by said crank about an adjustable pivot 166. The crank 164 is secured upon a shaft 167 'which is oscillated by means of an arm 1G8 engaging the groove 46 by meansof a suitable roller.

A forked member 169 pivotally mounted upon a shaft 171 is arranged to be moved through. a short are by means of a link 172 connecting one. portion of the fork 39 by which the packing'needles 37 are operated. The movcment of said lever 39 in moving its packing needle to disengage the mattress M causes the forked member 165) to be sufliciently elevated to mesh with the sector 161, said gears 17 being mounted upon a shaft 17 1 carried between the arms of the member 169. A. bcvcl gear 176 is secured in connection with the gear 173, said bevel gear l76'1neshing with a corresponding bevel gear 177 secured upon the upper end of a shaft 178. The. upper end of the shaft 178 is received within a pivotally mounted bearing 179 carried] by the shaft 174. The lower end of theshaft to one of the lovers means of a'universal joint 182 to an clongated pinion 183 meshing with a gear 184 mounted upon the supporting frame 1. The gear 184 meshes with a rack 186 secured along the edge of the work supporting table 4 whereby the entire machine is moved relatively to the table and a mattress supported thcrcon when the sector 161 is actuated in the manner above described. The distance moved by the machine during each revolution of the cam 14 is varied b v raising or lowering the pivot 166 to vary the throw at the upper end of the lever 163. \Vhen the cam 14 is further rotated to the point where the members 39 are actuated bring a gear 172-1 into to again more the packing needles 37 into the mattress, the forked member 169 will be lowered to move the gear 173 out of engagement with the sector and into engagement with a rack 187 'whereby the machine is locked against further movement: The forward movement of the machine relative .to the mattress together with'the reverse movement of the thread dispensing member 89 causes the stitch to be drawn tight and the thread 86 to be drawn into position to starting position during the forward movcment ofthe machine as shown in dotted lines in Fig.26 ofthe drawings.

The feathered connection provided upon the shafts 22 and 178 is provided for the purpose of admitting vertical adjustment.

of the frame 12 carrying the head 13 relative to the supporting frame 1 by means

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