US1575285A - Sewing machine - Google Patents

Description

mmh z ,1926. 1,575,285

C. J. SIBBALD ET AL SEWING MACHINE Filed April 2l, 1922 5 SheetsSheet l (1R01 nu;

March 2,1926. 1,575,285

C. J.v SIBBALD ET AL SEWING MACHINE Filged April 21, 1922 5 Sheets-Sheet 2 MmhI 2 1926.

5 8 5 n, n 7 e 5 wn M l ...w a m .f S 2M u mi N. m d@ www M0. nml. CJ LAZ AM1\ BGN. mm@ Swd ..58 dm C Cil CHARLES J. SIBBALD, JOHN O.

rsf/'Saas .PATENT N oFF-ics.

einsam, ANI) 'CHA-arias T. a. sii-seam, or Taos,

NEW YORK. y

snwING MACHINE.

Application filed April 21, 1922. Serial No. 555,925.

To uit wlw/m, t may concern:

c it lrnownthat we, CHARLES J. SrnisixLn, .ioziN O. Sineatn, and CHARLES T. A. Stanau), citizens ot the United States, residing at Troy, in the county ot' Rensselaer and State of New York, have invented certain new and useful Improvements in Sewing Machines, ot which the following is a specilication.

This invention relates generally to an iniprovement in sewing machines, and particularly to an attachmentI designed `for such co-` operative working relation to an ordinary machine, that thereby the sewing machine is adapted to stitch, in a predetermined cycle ot operation, a letter, groups ot letters, or al word or words, as may be required.

The present invention is particularly characterized by and as a. result ot the tact that the means et the invention by which the particular stitching result is attained, is p ure ly an attachment for the sewing machine. that is, it is wholly separateand independent ot the sewing machine mechanism, with the full capability oit being readily and con veniently connected to or disconnected from the sewing machine. It is however essential that there be means provided on the attachment to control the stitching mechanism so that when a name, letter or design is completed, the stitching mechanism will be automatically stopped, irrespective of the length ot the name, letter or design, said. means being employed to prevent overrun ot the stitches,

The improved attachment consists essentially in a cloth clamp in which the fabric 'to be operated upon is secured, and means,

suoli as independent cams, arranged to et' itect independent elements, rwith the component et the motion ot such elements transmitted to the cloth clamp. Obviously there tore, the movement o't the cloth clamp` and therefore et the material in its presentation to the needle tor the stitching operation, may be governed at will thru the particular cani formations provid-ed, and hence theabric may be moved in a single cycle of operation te cause the needle to stitch or outline therein a letter, group o't letters, design, or a word, dependent entirely upon the cam toi-mation f is the attachment is prin'iarily designed to stitch the trade pame a manufacturer in `fabric articles, `and as such names are frequently long, itisfnecessary to provide lengthy yand quite deep cam surfaces to eti'ect the stitching result. This necessity Vcorrespondingly involves long leverage and panying drawings, in which:

Figure l is a perspective view oi the attachment as applied to the sewing machine. p Figure 2 is an end elevation, parts being omitted in the rear `to clearly illustrate the invention.

Figurev 3 is a detail plan view of the cam element and associated parts, the standard of the sewing machine being in section.

` Figure fl is a detail perspective view ot the means employed toV impart intermittent motion to the cloth clamp.

Figure 5V is a detail perspective iiew ot the manually operated clutch resetting means.

Figure (i is a detail perspective view ot the reverse side ol' the pulley of the resetting means shown in Figure 5.

The improved 4attachment comprises a material clamp including a lower member l, which is adapted to restsquarely on and be freely movable with respect to the bed plate 2 ot the-sewing machine, which latter is indicated generally at 3. An upper or movable member 4 cooperates with the lower member l ot the clamp, said upper member being pivotally connected at 5 to the lower member, and held in clamping relation to! thelatter thru spring 6. Means are provided to permit operation ot the upper clamping member by suitable treadle oonnections .when necessary to insert or withdraw material into' or from the clamp. Both clamping members are :termed at their tree ends with enlarged portions 8 having interior openings, 9V oit suticient area to per- --mit, the. tall desired ,movement of the ma terial Without interfering with the stitching movement of the needle thru said. openings.

Extending longitudinally from the lower cloth clamp member 1, is a bar 11, and on its under side, remote from the clamping end it is provided With a block 1.2. This block is mounted in transverse guideivays 13, on

a. block 14, which is formed at opposite endsY with gibs 15, mounted to slide in fixed guideways 16, arranged at right angles to the guideWays 13. Extending upwardly from the bar 11, areears`17, to the upper ends of which the pivotal connectionl 5k is formed, for the upper clamp member 4. Rising from the free en'd of the upper clamp member are ears 18. between Which is pivoted a lever 19. Pivoted` intermediate the ends of this lever is a supporting link 20, the lower end thereof being pivoted at 21, to the bar 11. To the inner' end of the lever 19, is attached the clamp lifting means, which comprises Aa flexible connect-ion 22, connected to one end of a pivoted lever 23, to the opposite end of which is pivoted a rod 23a, which leads to afoot pedal (not shown).

A. rock shaft 25, is supported in uprights 26, rising from the attachment base, and depending from this shaft is a finger 27, the lower end of which engages the" end of an extension 28, attached to the block 12, av spring 29, attached to said .finger and block, serving to maintain contact between the edge of the finger and the end of the extension. Extending" from the shaft 25, is a lever 31, Whose movement is controlled by a cam element 42. Suspended from the lever 31, by a spring 32,` is a Weight 33, to maintain said lever in intimate relation With the cam element and thereby impartk accurate movement to the block 12. The sudden movements frequently imparted to the lever by abrupt 'cam surfaces renders it pi ctically necessary to Alend lto the Weight a certain amount of resiliencyA to insure accuracv Vin transmitting the motion from the cam sur aces to the aclot-h clamp, and we have therefore discovered that this condition can be successfully met bysuspend` ingthe Weight on a spring' as shown.

Extending longitudinally from the block 14. is a bar 35,'the free outer end vof whichV hereinafter described. A coiled spring 38,

attached at one end to the block 14, and at its opposite end to a Stud on the attachment base, acts to move the block, and the parts it carriesin a direction oppositie tol that imparted by the action of the cam surfaces. v M f p Manatee in a bearmg 1a the attachment base, and extending above the same is a vortical shaft 40, provided at its le Wer end with a Worm gear 41. On the upper portion of this shaft is mounted the cam member 42, provided With a vertical annular flange or drum portion 43, and a bottom horizontal flange 44. The edge of the drum portion 43 is provided with a plurality of definite ly arranged and predetermined cam surfaces 45 to actuate the cam lever 31 While the edge of the flange 44, is provided with cam surfaces 46, to engage and actuate tle cam lever 36. Adjacent the cam member 42, is a vertical guideway 47, in which slides a block 48, having a projecting roller 49, arranged to be in the path of movement of the cam surfaces 45. The cam surfaces 45 and 46, are so cut as to actua-te the two cam levers in a manner that the composite action will move'the cloth clamp under the needle to stitch in the fabric a predetermined letter, Word or design, as will appear later on in the description of the operation of the machine.

Supported in bearings ydepending from tle attachment base, is a shaft 50, carrying a Worm h, Which meshes with the Worin faear 41, on the cam carrying shaft 40. On

the end of the shaft 50, is a loose pulley and` aL fast disk 53. Also mounted fast on the shaft is a ratchet Wheel 54, and on opposite sides of the saine and sivingingly mounted on the shaft is a yoke 55, and betufeenthc free ends cf the saine is pivoted a spring' actuated pawl 56 normally in engagement with the ratchet teeth to rotate the shaft 50. lConnected to the yoke 55, is a link 57 Which is pivoted at its opposite end to a lever 5S, depending from the usual oscillating sha-ft59, employed in connection with the feeding means of the sewing machine, whereby to swing the yoke on its shaft to impart intermittent motion to the cam element. A hold back paWl GO, is pivoted'to the attachment base and is adapted to prevent retrograde movement of the shaft.

A spring Gl isattached at one end to an arm depending` from the base of the attachment and at its opposite end to a belt f3.2. 'llie belt passes around the loose pulley 52, thence over an idler 63, then to a treadle (not shown), 0n one face of the loose pulleyv is a lug 64, adapted to contart with a lined stop 65, on thel frame, While on the opposite face ofthe pulley is a spring stop GG, which cooperates with a stud G7. projecting from the disk toward pulley In lthe depression of the treadle, the belt G2 drawn upon, tensioning the spring Gl` and the friction between said belt and the loose pulley rotates the latter and the outstandingl end of the spring stop GG, picks up the lug' 37 and rotates the shaft 50, until the lug G4. contacts With the fixed stop on the 'if-achille ,lieu when pressure en the pedal titi is relieved, the reverse motion of the belt, correspondingly reverses the motion of the pulley yu ntil the lug 6ft, contacts with the opposite side of the "lixed stop 55. 'lhe func tion of this [nu-'ticular mechanisni is to enable the operator to manually opera-te the shaft 50, to` return the (am element to a zero position after the usual stop motion has been brought into play and stopped the stitching mechanism. This is necessary Where the letter 0r name stitched is not of sufficient length to cause a complete revolution of the cam element.

lt is of the utmost importance that the stitching mechanism be stopped imn'iediately the letter, name or design has been completed. vOtherwise, additional stitches or tails -ivould be formed on the Worl;` and `would of necessity have to besubscquentiy icinoved, or second grade work would result. lille have therefore provided means, with which the cam elen'ieiit cooperates, to actuate a stop motion mechanism eigactly at the time of completion of the last stitch of the letter or Word.

T0 indicates a stop motion including the usual fast and loose.4 pulleys 7l and 72, and indicates a power belt. The belt passes thru an eye 73e, in a lever tt mounted on a vertical shaft 75. Secured to the shaft 75, is an adjustable catch T 6 which cooperates -with a latch 7i', formed on the end Vof a lever T8, pivoted to the top of the attachment base at 79, the latch being drawn toward the catch by a spring S0, On the lever '78, is a lug 81, formed with a cam edge 82, and cooperating therewith is a cam lug 83, depending from the bottom of the cam element 42, the parts being so arranged that when the lug S3, contacts Vwith the cam edge of the lug 81, the latch will be disengaged from the catch and the belt will be shifted to the loose pulley through the usual mechanism and the stop motion brought into play to stop the stitching mechanism in the usual way. Y

ln operation, a piece of fabric is placed between the jaivs of the cloth clamp, and the upper clamp member is lowered. The stitching machine is tripped in the usual manner, which action actuatcs the catch 76, and its end engages the lever 78, and is cauglit behind thelatch end to position the parte for automatically stopping the mechanism when a letter, name or other design is con'ipleted. The oscillation of the shaft 59 of the feeding mechanism, actuate-s the con ncctions 58 and 57, which in turn rock the volte 55, and thru the ratchet Wheel 54, the

`ishaft 50 is intermittently rotated. It may here be stated that the parts are so timed :hat the intermittentmotion of the shaft 50, occurs at `the time the needle is out of the fabric. Thru the iv-orm 501 andthe 'rem ser al; ,the een alcuna@ is :een

mittently `rotated to impart to the clOtll clamp the requisite movement to s. h the predetermined .design inthe fabric.

The `cam surfaces 45 and 4.6, .are formed so as to produce the necessary movement of the cloth clamp under the needle, to cause the latter .to stitch apredetermined letter or name, it being understood that for each such predetermined letter or name. a special cam element is required. The composite movement resulting from the .tivo cam surfaces result-s in the cloth clamp being moved in` a path under the Aneedle to produce curves and angles, consequently naines may be stitched in goods in the form-of signatures to identify the manufacturer.

As the cam element rotates, the raised portions of the cam surfaces 45, ,through the vertical movement ofthe slide t8,and the upward movement .of the lever 3l, rocks the shaft 25, `and conseque ntly the linger 2o, the movement of this finger toward the sewing machine head engaging the extension 2S, and bodily moves the cloth clamp in the guideways 13,7011 in a transverse direction. The depressed portions of the cam surface will, thru `the Weight S3, ylower the lever 3l., and because of the spring 29, cause a reversal of the transverse movement of the cloth clamp. 'lt therefore follows Ythat by the action of the icamf surfaces 45, andthe connections described, transverse movement of the cloth clamp is controlled and made possible. The raised portions of the cam surfaces 46, act to rock the contact end of the lever 3G, outwardly, while its inner end is i moved. inwardly and against the bar 35, which results in the "cloth clamp being` moved longitudinally in the guidevvays 16, or at right angles to the movement imparted by the cam surfaces 45. The depressions in the camv surfaces 4.6, cause the spring 38, to retract'the longitudinal movement of the cloth clamp inthe guidways 16, so that the entire longitudinal movement lof the cloth clamp is controlled and made Vpossible by the cam surfaces and the spring.

There isno permanent connection between the operative ends of the levers 3l and 36 with the cam surfaces, which is equally true with reference to the contacts made between the lever 36 and bar 35, and the finger 2G and the extension. This arrano'cment' permits free action With little binding frici tion between the parts, and in addition as sures of accuracy in defining the movement of the fabric, which is important when imitating a` naine by stitching.

When the letten or name has usen co1nplated by the stitching operation, the lug 855, on the cam element 42, engages the cam lug `til on the lever 78, and rocks the latter on its pivot i9, which disengages the latch end from the catch 76, which thru the connect'iaiisf described. remesas unsinnig motie-ii,

mechanism and stops the stitching mechanism, hence the intermittent movement of the cam element ceases. It must be understood that the cam element may be stopped at any point in its revolution, the point of stopping depending entirely upon the length of the letter, name or design to be stitched. When the cam element is stopped it must be restoredv to a normal position and this we accomplish manually and wholly independent of the movement of the stitching mechanism. This movement is brought about `by the operator depressing the pedal and tensioning' the belt 62 which frictionally rotates the loose pulley 52 until the projecting end lof the resilient stop G6, contacts withv the lug 67 and rotates the disk 58,'which of course rotates the shaft 50,*and thru the gears the lcam element 42. This movement is continued until the lug 64C, encounters thelixed stop 65, which determines the normal ,or zero position of the cam element. When the cam element is returned to normal position, the operator removes pressure on the pedal, and the spring 6l returns the belt, consequently the pulley 52, to normal position, the pawls 56 and GO holding the ratchet 54e in position.

The rod 28,is `connected'` to the pedal which operates the loose pulley 52,' and the length of the fieXible connection 22 is such that it will not operate the cloth clamp until after the loose pulley has been rotated sufficiently to bring the cam element to normal position, so that if it be desired to stitch over the same letter or name to cure a defective stitch such operation can be performed without lifting the cloth clamp. The cloth clamp may however be automatically lifted when the stitching operation is completed by placing atrip 90 automatically operated by the mechanism of the sewing machine after a predetermined interval, under the lever 23.y

From the foregoing description it is apparent that the material clamp and therefore the material will be moved as a result of the formation of vthe cam surfaces, the component of the cam movements thus directing the material along predetermined lines beneath the needle, so that the usual stitching movement of the latter will form in the fabric the desired letter, group of letters, word or words. To render the improvement of commercial value, it is of course obvious that its main use is in applying to fabric articles of manufacture,'say for eX- ample collars, a particular letter, group of letters, or words, denoting for example the name or trade mark of the manufacturer. In such a use, which it is evident is only one of many, it will be appreciated that such letter, group of letters, word or words,must be completely formed at each cycle of operation, lthat following such cycle of `operation the sewing machine must be stopped; and the cam or other material clamp control must be brought to an initial or starting vposition; so that the machine is capable ofrcpeating the letter, group of letters, word or words, in the successive fabric articles presented to it with the minimum loss of time between each cycle of operation and the minimum requirement on the part of the operator as to any adjustment or manipulation of parts.

lVhei-e circular or cylindrical cams are used, as in the present construction, the large number of stitches required necessarily limits the angular distance between stitch points to from one to two degrees, while the greatest distance in height between any two adjacent stitch points on either cam, depends upon the lever ratio between the cam and material clamp. If the levers are so pivoted as to move the clamp by the full amount of rise or fall in the cam between stitch points, any error in the cam is reproduced in full at the clamp, and it the rise or fall in the cam is s ight, any lostmotion in the parts between the cam and the clamp will absorb this slight movement before it reaches and effects the clamp. However, as is incident to the present construction, the levers may be so pivoted as to decrease the motion vimparted by the cam with respect to the clamp, thus decreasing the effect of any'possible cam error. However, this arrangement requires that the rise and fall on the cam must be greater than in other lever mountings, and as the linear distance between the stitch points on the cam must remain the same, the rises and falls of the cam must be steeper. As the levers are pivoted, the cam engaging end, if directly engaging the cam, must move in the are of a circle Therefore unless successive stitch points are of the same height, imperfect cam operation would result.v That is to say, if the lever is mounted for pivotal movement and its free end operated directly by the cam, the maximum horizontal. distance between the free end of the lever and its pivotal point is when the lever is exactly horizontal, and when the lever swings above and below this horizontal plane, the linear horizontal distance between the pivot point of the `lever and that point at which the lever engages the cam, is shortened. Thus the cani engaging end of the lever cannot exactly follow the cam with true accuracy of lever movement due to cam alone, thus resulting in error. rl `h'is error naturally increases with the increase in the totalrise and fall of the cam and as naturally decreases as the distance between the lever pivot and the cam engaging end of the lever is increased. This difficulty has been reduced to a material extent by operating the lever at the cam endthru the block working in guides and operated by the cam izo Cil

and in turn operating the lever. Thus the lever operating means from the cam moves in a straight line. Of course it -tvill be iinderstood that as the lever 3l rises and falls through movement of the block engaging the cam, the effective length of the lever' 3l is continually varied, that is, lengthened above and below the true liorioiital position4 of the lever, but this variation is effectively compensated for by corresponding variation in the effective length of the iin-V ger 27 engaging the end ofthe extension 28.

The important features of the present invention reside in having the clamp moving mechanism as an attachment, that is, entirely separate from the seiving machine, to thereby permit the use of comparatively enlarged cams and levers of Suitable length and appropriately pivoted Without regard to the` construction of sewing rmachine used. Furthermore, in arranging the levers to decrease the amount of motion between the cam and the clamp, the cam error is thereby decreased. In having the `carriage or cloth clamp so mounted, that the material may be brought close to the throat plate of the machine; in providing a stop motion for the machine and combinedV in operation therewith a means for subsequently bringing the cams to an initial or starting position; and in providing for the complete mechanical operation of the structure as a Whole, for the automatic stitching of letters, groups of letters, Word or Words,

the present construction presents an a1"- rangement of commercial practicability.

lt frequentlyhappens that Ia trade mark includes more than one. Word, andin order to take care of this situation and formthe proper space between the Words, and vto avoid stitching between the Words, the cam element is provided with an additional lug to stop the sewing mechanism at the completion of the firstivord. The operator then manually moves the cam element to move the fabric to form the space, and then the sewing mechanism is again started to stitch the next word.

Claims:

l. The combination with ar sewing machine of an attachment therefor to permit stitching of letters, words, characters, or thel like, said attachment including a material holder to present the material to the stitching mechanism of the sewing machine, a cam for controlling the movement of said holder, a sewing machine stop motion controlled :in and by the movement of the cam, and manually operable means independent of the stitching mechanism to move said cam to a normal startingY position following the action of the stop motion. v

2. The combination ivith a, sewing machine of an attachment therefor to permit stitching` of letters, vvords, characters, or the like, said attachment including a material holder to present the material. tol the stitching mechanism of theksevving machine, cani for controlling the movement of said helder, a sewing lhacliintystop` motion cntrelled in and the i'hoveiiieiit of thecam, and means operative to move the caintoy predeteri in'ecl relation'v to the stitching "ie'chaliism independently of the stop moti'o'n action. l

The combination with a sewing macliine f an attachment tlierefor'to p'rl'ilii',V stitching of letters, Words, characters, or the like, said attachment including a material holder to present material to the stitching mechaii'isni of the sen'ingmachine, a cam intermittently operated by the seiving machine for cdntrclling the movement of said. holtler, a sewing machine stop inoticn controlled in and by the movement of the cam, and in-:lependeit means for selectively contimiin'g the intermittent motion of the cam following the action of theustop motion.

4. The combination I"with a sen-*ing machine. of an' attachment therefor to permit stitching `of letters, words, characters, cr the like, said attaclnnent including a material holderlo present the material to the stitching mechanism of the sewing machine, cam for controlling Vthe movement vof said holder, means for feeding the cam in a step-by-step movement. in the operation of the sewing niachi'iie, and a sewing machine stopmotion controlled in and by the indepei'id'e .t movement of the cam, said' calm be-i ing Vf e of thepfeeding nieains whereby te permit n'ianual molvemfent of the cani, independently of the operation ofthe feeding means, following the action of the stop motion., Y

t3. rlhe combination with a sewing machine of an attachn'rent therefor to permit stitcl'i'ing of letters, Words, characters, or the like, said attachment including a material holder to' present the material to-thestit-ching mechanism, aj cam for coi'itrolling the movement of said holder, means forifeeding the camiirastep-by-step movement in the operation of the sewing machine, a sewing machine stop motion controlled in and by the! movement of the cam, whereby to arrest the stitching at a predetermined point, and manually operable. means to fui'- ther operate the Vcam' to` a predetermined position without affecting the stitching mechanism. Y

6. The combination with a' sewing machine of anattachment therefor to permit stitching ofv letters, Words, characters, or the like, said attachment includ-ing ay material holder anism ofthe sewingy machine, a cam for contrllinglthe movement of said-holder, means for feedinglthecam in a stepA-by-step' movementi in the Voperation of the sevving mato present; the material to the stitching mechchine, a sewing machine stop motion controlled in and by the movement of the cam, whereby to arrest the stitching at a predetermined point, and manually operable cam positioning means adapted for actuation following the action of the stop motion and independently of the sewing machine.

7. The combination with a sewing machine, of an attachment therefor including a material holder to present the material to the stitching mechanism ofthe sewing machine, a vcam normally free'of the sewino' machine for controlling the movement or thc holder, step-by-step cam feeding means operated by the sewing machine, means operated by the cam to limit actuation of the stitching mechanism at a predetermined point in the cam movement, and manual means for operating the cam beyond said predetermined point to position the cam at a normal starting point independently of the stitching mechanism.

8. The combination with a sewing machine, of an attachment therefor including a material holder to present the material to the stitching mechanism of the sewing machine, a cam, means intermediate the cam and holder to operate the latter in accordance with the cam formation, a stop motion for the sewing machine, means on the cam to actuate the stop motion in a predetermined position of the cam, manually operable means to move the cam independent of the stitching mechanism and following the action of the stop motion, and means to limitsuch independent movement of the cam to the normal starting position thereof for the next stitching operation.

9. The combination with a sewing machine, of an attachment therefor including a material holder to present the material to the stitching mechanism of the sewing machine, a plural cam, means intermediate the cam and holder to operate the latter'm accordance with the composite cam formation, a stop motion for the sewing machine, means on the cam to actuate the stop motion 1n a predetermined position of the plural cam, manually operable means to move the plural cam independent of the stitching mechanism and following the action of the stop motion, and means to limit such independent movement of the plural cam to the normal starting position thereof for the next stitching operation.

l0. The combination with a sewing inachine, of an attachment therefor including a material holder to present the material to the stitching mechanism of the sewing machine, a cam, means intermediate the cam and holder to operate the latter in accordance with the cam formation, meansintermediate the sewing machine and cam to impart a step-by-step movement to the cam in the operation of the sewing machine, means for stopping the sewing machine mechanism when the cam has reached a predetermined point, a normal-position locator for the cam, and means for manually adjusting the cam with regard to said locator independently of the sewing machine mechanism.

11. The combination with a sewing machine, of an attachmenttherefor including a material holder to present the material to the stitching mechanism of the sewing machine, a cam, means intermediate the cam and holder to operate the latter in accordance with the cam formation, a shaft, means intermediate the shaft and cam for operating the latter in the movement of the shaft, means op erated by the sewing machine for actuating the shaft, a stop motion for the sewing machine operated by the cam, and means for independently operating the shaft following the action of the stop motionto advance the cam to a normal starting position without affecting thek stitching mechanism.

12. The combination with a sewing ma chine, of an attachment therefor including a material holder to present the material to the stitching mechanism of the sewing machine, a cam, means intermediate the cam and holder to operate the latter in accordance with the cam formation, a shaft, a ratchet wheel secured on the shaft, means operated by the sewing machine for imparting a step-bystep movement to the ratchet wheel, a stop motion for the sewing machine Vmechanism cont-rolled in the movement of the cam, a limiting stop adjacent the shaft, a stop cooperating member loosely mounted on the shaft, manual means for actuating said member, and means whereby said member in actuation engages and operates the shaft to a position determined by said limiting stop and stop cooperatingV member, whereby to operate the cam to a normal starting position following the action of the stop motion. 13. A letter writing attachment for sewing machines, including plural cam members to be actuated by the sewing machine, a material holder including clamping members, a block on which said holder is secured, a guide in which said block is slidable, a second guide in which the lirstsmention-ed guide is slidable, means controlled by one cam member to adjust the firstementioned guide in the second guide, and means cooperating with the other cam member to adjust the block in the first-mentioned guide, said latter means including a lever con nected with the block, an arm for operating the lever, a support adjacent the plural cam member, a member slidable in the support andoperating the arm` and means carried by the last-mentioned member to engage the said other cam member, and means for lll) operating the plural cam member as a unit to thereby operate the material holder with composite cam control.

la. The con'ibination 'with a sewing;l machine having stitching` mechanism, of an 4attachment therefor includinga material holder to present the material to the stitching mechanism, a cam for controlling the i'novement ot said holder, a sewingmachine stop motion, a plurality of means on the cam for :successively operating the stop motion at successive periods ot caminovement Within a complete cycle ot cam movement, and means tor manually advancing the cam tollovving any action of the stop motion to advance the cam to a fresh starting position and simultaneously operate the holder to provide a determinate spacing of the material between the iinal stitching determined by the stop motion and the initial stitching following the stop motion, Whereby to provide for the proper spacing of a plurality of Words, letters, characters, or the like, making up a single cam cycleV ot operation.

l5. The combination with a sewing` machine having stitching mechanism, of an attachment therefor including' a material holder to presentthe material to the stitching mechanisni, a cam for controlling the movement or, said holder1 a sewing machine stop motion, a. plurality ot means on the cam for successively operating the stop motion at succeedingl periods of cam movement Within a complete cycle of cam movement, said material holder comprising clamping,` members adapted to be operated at will to release the material, and means for manually advancing the cam a. definite distance succeeding any stop motion action oi" the cam Without releasing the material holder clamping" action on the material, whereby in the event otl imperfect stitching the manual operation ofthe cam in restoring the same to normal starting position will simultaneously position the material to normal starting position for an exact duplication in the material ot the original stitching.

16. The combination With a sewingmachine having` a stitching mechanism, of an attachment therefor including,` a material clamp to present the material to the stitching` mechanism, a cam ttor controlling the movement o'i'f the material clamp, a sewing;` machine stop motion, means for manually operating the clamp to release the material, and means to mannually operate the cam :following` the action of the stop motion to advance the cam to a normal starting position, said means for manually operating the cam being capable of operation at Will Without effecting an operation of the clamp to release the material, whereby at will the material stitched in one operation of the clamp may be restored to initial starting position oit such stitch simultaneously with the manual movement of the cam to normal starting position, to thereby restitch the previous stitched outline.l n

In testimony whereof, We atliX our signatures.

CHARLES J. SIBBALD. CHARLES T. A. SIBBALD. JOHN O. SIBBALD.

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