US814025A

US814025A - Sewing-machine.

Info

Publication number: US814025A
Application number: US21747404A
Authority: US
Inventors: Charles A Dearborn
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-07-21
Filing date: 1904-07-21
Publication date: 1906-03-06
Anticipated expiration: 1923-03-06

Description

N0. 814,025 PATENTED MAR. 6, 1908. C. A. DBARBORE. SEWING MACHINE.

APPLIGATIOR rum) JULY 21. 1904.

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Suva/14 1306 N0. 814,025. PATENTED MAR. 6, 1906. G. A. DEARBORN.

SEWING MACHINE.

APPLIUATION FILED JULY 21, 19%.

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gmuum lw/tymo WM 2 @Znafi alike Maw No. 814,025. PATENTED MAR. 6, 1906. O. A. DEARBORN.

SEWING MACHINE.

APPLICATION FILED

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wwmidvg No. 814,025. PATENTED MAR. 6, 1906. U. A. DBARBURN. SEWING MACHINE.

APPLIGATION 211.51) JULY 21. 1904.

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Specification of Letters Patent.

Patented March 6, 1906.

Application filed July 21, 1904. Serial No- 217,474.

1'0 all whom it may concern.-

Be it known that 1, CHARLES A. DEAR- BORN, a citizen of the United States, and a resident of New York, in the borough of Manhattan and county and State of New York, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification.

The present invention relates to improvements in the t pe of sewing-machines for oversearning blindstitch work, such type of machine being illustrated in Patents 'No. 639,669, dated December 19, 1899; No. 679,553, dated July 30, 1901; No. 705,325, dated July 22, 1902, and No. 705,326, dated July 22, 1902, heretofore granted to me.

The object of the present invention is to improve the construction and operation of this type of machine with a view to increasing the accuracy of the work and speed of the machine.

In machines covered by my above-named atents the feeding mechanism is in the orm of intermittently-actuated rotating feed-rolls mounted upon a s ring-sustained work support or frame an engaging the work from beneath and holding it up against a rigid presser-foot in proper position for the action of the stitch-forming mechanism. In one of the old forms of my machine I have also employed an auxiliary reciprocating feed mechanism engaging the work from above to cooperate with and supplement the action of the under roller feed mechanism referred to. These old forms of feeding mechanism are extremely complicated and expensive to manufacture, and the location of the operating parts necessarily presents objectionable obstructions above the plane of the work-sup port which interfere with the convenient manipulation of the work. The improved machine overcomes these objections, as hereinafter explained.

In the old forms of my machine the needle operating transversely of the line of feed penetrates successive parts of the work which passes over a ridge-forming rib, (also mounted upon the s ring-sustained work supfport or frame) whic in some cases is a part 0 one of the rotary feed-rolls and in other cases is an independent part pro iecting between the feed-- rolls into engagement with the under surface of the work. The looper, which cooperates with the needle in the old forms of my machine, is arranged to be actuated from the rear end of the looper-rod by an eccentric universal crank mechanism, which imparts to the loo er a forward motion on one side of the line 0 stitching, an axial motion to throw it to the other side of the line of stitchin a rearward motion on the other side of the ine of stitching, and finally a second axial motion to throw it back to the position of starting, the loopertakin the loop from the needle on one side of theline of stitching and giving up the loop to the needle on the other side of the line of stitching. V

in the new form of machine which I desire to (protect in the present case I have emho ied numerous 1m rovements in several essential parts of a b indstitch sewing-machine of the type referred to.

I have discarded the rotary under-feed rolls of the old form of my machine and have substituted therefor two inde endentlymounted universally-movable Wor support ing plates, which are mounted upon the usual spring-sustained work-supporting frame and are arranged with their work-en aging ribs upon opposite sides of a small reely-journaled rotary ridge forming disk. One of these universally movable work-supporting plates is capable of greater yielding motion than the other for the pur ose of properly supporting the hem side of t e work to be operated upon. These independent univer sally-movable work-supporting plates effectively support the work upon opposite sides of the ridge-forming disk to insure the accurate penetration of the needle at both sides of the ridge formed in the work by said disk, therebyinsuring the sewing to ether of the two edges of the work from on to end of the line of stitching and further insuring uniformity in the appearance of the work. To accommodate the free] -journaled ridge-forming disk and the in ependently-yielding worksupporting plates on opposite sides of the disk, I form the spring-sustained work an ort or frame in the shape of ahorn at thele tand side. of the machine. This hornshape is also convenient for the insertion, removal, and operation of the work being stitched.

In place of the rigid presser-foot, which has heretofore been universally used on my blind-stitch sewing-machines, as shown in my above-named patents, I provide in my improved machine an intermittently-movable presser-foot which automatically raises slightly from the work to free the work for each feeding-stroke of the feeding-dogs and also automatically returns into engagement with the upper face of the work immediately after each feeding-stroke, just as the needle is about to penetrate the material, so as to hold the work firmly and accurately while the needle is passin through it. This presser-foot is preferably pivoted at its rear end so as to project over into position above the yielding work-su orting plates and is provided with a suitable s ring which automatically raises it as the ceding-dogs start to act. A suitable cam mechanism engages a part projecting from the presser-foot for controlling or timing this upward or releasing action and forcibly moving the resser-foot downwardly against the tendency of its spring into engagement with the work at the completion of the feeding-stroke and just prior to the penetration of the needle.

is stated above, the old form of underfeed-roller mechanism is done away with in the improved machine, and in place of such feeding mechanism I employ in the new machine an effective reciprocating upper-feed device. preferably in the form of.a two-part serrated feed-dog, the two parts being arranged end to end parallel with the line of feed with a small space separatin them to allow for the operation of the nee lc. This two-part feed-dog is mounted upon a reciprocatory arm or bar actuated at its rear end by an eccentric upon the main driving-shaft of the machine and sup orted between its ends bya pinor stud whic elongated journal-opening aving a peculiar cam-shaped wall so arranged that in combination with the actuating-eccentric it will cause the feed-dog to have an effective horizontal feeding-stroke in engagement with the work and a return movement disengaged from the work. The omission of the compl cated under-feed mechanism of the old machine and the employment of the simple reciproeatory feed-dog which is supported from the machine-arm above the plane of feed greatly simplify the machine and materiallv increase the scope of its work.

The looping mechanism of my improved machine accom )lishcs the same urposes as the looping mechanism in the old orms of the machine, btttis of a greatly changed and im-t )rovcd construction. The improved looper ls formed with a single prong or finger havin the necessary shoulders for engaging an carrying the loop to take the loo off of the needle at one side of the line of stitching and carrying it over to the other side of the line of stitching and deliver it again to the needle. The looper is adjustahly mounted in the forward end of the looper-bar, which is formed between its ends with a journal opening loosely inclosing a journal-sleeve upon which thc looper moves. This journal-sleeve is freely journalcd upon a stud projecting latcrally from the free end of a suspended rockarm. which rock-arm is keyed to the end of a passes through an rock-shaft suitably journaled in the machinearm and having a connected rock-arm and link at its opposite end, which link extends rearwardly to the main driving-shaft and engages an actuating-eccentric upon said shaft y which the suspended rock-arm su porting the journal-sleeve is ivcn a to-and- 0 rocking motion for carrying the looper forward and back toward and away from the ath of the needle. The looper-bar has two iametrically opposite center screws which pass through the walls of the journal-opening and are journaled in diametrically opposite sock ets formed in the sleeve. By reason of this connection of the looper-bar'with the sleeve journaled upon the rock-arm it is possible for the looper to rotate in a vertical plane or move on its pivots in a transverse plane, so that the looper can move toward and away from the work and transversely to the line of stitchin Unlike the looper mechanism in the old orm of my machine the forward and back movements of the looper are caused by the movement of the suspended rock-arm, which is actuated by the independent eccentric mechanism just referred to. This suspended rock-arm also gives the loo er a slight rise and fall in moving forwar and backward. For increasing the rise and fall of the looper at the end of its forward and back strokes and to move the looper from one side of the line of stitching to the other side of the line of stitching I provide an eccentric universal crank mechanism upon the main driving shaft which actuates a laterallyswinging floating bearing with which the rear end of the looper-rod has a free rotary and sliding engagement. This eccentric crank mechanism is similar to the same 'mechanism employed in the old forms of my machine; but in place of directly and positively connecting the rear end of the looper-rod with the said crank mechanism I have provided in the new machine a universally-jointed laterally-swinging floating-bearing frame hav ing a loop at its rear end through which center screws pass and engage the sleeve journaled upon the eccentr1c-1nclined crank-pin, said floating-bearing frame being formed upon its lower edge with two a'lined sockethearings in which the cylindrical rear extension of the looper is freely journaled so as to l have free rotary and longitudinal movements therein. By reason of this construction it will be observed that the forward and back movements of the looper are caused entirely by the suspended rock-arm, the looper-rod riding freely in the floating bearing of the guidin -crank mechanism just described, while t e inward and outward vibrations of the said floating bearing produced by the rotation of said inclined crank-pin cause the looper to move from one side of the line of stitching to the other.

In order that my invention may be fully understood, I will first describe the same with reference to the accompan ing drawings and afterward point out t e novelty with more particularity in the annexed claims.

In said drawings, Figure 1 is a side elevation of my improved sewing-machine. Fig. 2 is a front elevation of the same. Fig. 3 is a top plan view of the same. Fig. 4 is a detail sectional plan view of parts of the work supporting and feeding mechanisms. Fig. 5 is a similar view of the work-supporting mechanism, the resser-foot and feeding mechanism being omitted for the sake of clearness. Fig. 6 is a detail vertical transverse sectional view of the same mechanism shown in Fig. 5. Fig. 7 is a detail sectional front elevation showing the mechanism for controlling the movements of the resser-foot and the needleguide. Fig. 8 is a detail sectional elevation showing the support for the feeding-bar.

The main frame of the machine is formed of a single casting comprising a rigid central base 1, the upwardly-extending rear arm 2, terminating in the sleeves or shaft-bearing 3 4, and a forwardly-extending arm 5, having the needle-shaft bearings 6 7 and the looper rock-shaft bearing 8.

10 is the main driving'shaft of the machine journaled in the sleeves or bearings 3 4 of the rear arm 2 and having ke ed to one end a driving-pulley 1i and fl -w eel 12 and at its opposite end a crankisk l3, hereinafter referred to.

15 is the forwardl extending needle rockshaft journaled in the

bearings

6 and 7 and having rigidly mounted upon its forward end a needle-carrying rockarm 16, in which is mounted a curved needle 17.

18 is the usual thread-guide and needleclamp mounted upon the rockarm 16 by means of the set-screw 19.

20 and 21 are ordinary thread-guides.

Secured to the rear end of the needle rockshaft 15 is a rock-arm 25, having universaljoint connection 26 with a link 27, which encircles an eccentric 28, mounted upon the main power-shaft 10 just inside of the crankdisk 13. The link 27 and the eccentric 28 are formed with spheroidal engaging surfaces to allow free lateral play of the link in the transmission of the rotary motion of the main shaft 10 into the oscillatory motion of the needle-shaft 15. By this needle-operating mechanism (which is the Same as in the prior patents) the needle is given a reciproratory motion in an arc transverse to the path of the work which is passed through the machine by the mechanisms now to be described.

Projecting up from the forward edge of the base 1 is an auxiliary arm 30, which is rigidly and adjustably secured to the base by means of set-screws or bolts 31. The auxiliar arm 30 is formed at its upper end with two s eeves 32 and 33 in which is mounted a pivot-shaft 34, projecting a little beyond each of the

sleeves

32 and 33. Set screws 35 pass through the

sleeves

32 and 33 and engage the pivotshaft 34 for holding it rigidly in position 40 is a horizontal forwardlyextending siprin sustained work-supporting frame.

his rame 40 has the rearwardly-presented integral journal-sleeves 41, which are journaled upon the projecting ends of the, Wetshaft 34 and rest snugly against the amesleeves 32 and 33, by which the work-support 40 is accurately held in position, said support being allowed to move vertically upon its pivot. Surrounding the pivotshaft 34 between the

sleeves

32 and 33 is a. torsion-spring 45, one end of which is extended beneath the work-supporting late 40 to hold said plate upward with a yie din pressure, .while the other endwlet' of sai spring is extended down behind the auxiliary frame-arm 30 and is engaged by a book 46, formed on the rear end of a threaded rod 47, which asses freely through an o ening formed in the arm 30 and is engage at its forward threaded end by a butterfly-nut 48, by which the tension of the spring 45 can be increased or decreased at will. The worksupport 40 is also formed with an inte ral downwardly-projecting arm 41, extcn ing below the left-hand bearing 41 in position to engage an adjustable stop in the form of a screw 49, which is threaded through an integral post of the auxiliary arm 30. By ad iusting the screw-stop 49 t e limit of the normally raised position of the work-supporting plate 40 under the action of the spring 45 can be adjusted to a nicety.

The work-supportin plate 4f) is extended to the left (viewin the machine from the front, as shown at ig. 2) into a work-sup porting horn of approximately cylindrical shape, which horn 55 is cut out upon its upper face to receive the ridge-forming disk and the inde endentl -yielding work-supporting plates, w ich wil now be ex lained.

is the ridge-forming isk freely journaled upon a pin 61, pro ecting through the integral 111 62 of the work-supporting horn 55. The 15k 60 has formed integral with it a laterally-proieeting hub 60, in which is cut an annular groove 60 the hub operating in close contact with the supporting-in 62 of g the horn and forming a su stantial caring for accurately maintainin the rotarydisk 60 in operative position. his rid e-forming disk 60 is a simple disk of hardened steel, which is capable of freely rotating upon its journal-support as the work passes over it under the action'of the feeding mechanism. The journal-pin 61 of the ridge-forming disk 60 is arranged in the same vertical plane as the needle, so that the needle 'w'ill ass through the work just above the hig est point of the periphery of disk 60. This rotary ridge-forming disk is important, because it oonstantl presents a new part of its periphery under t e needle, and thereby distributes the wear and avoids the formation of ooves in its working ed es.

There are two indepen ent universallymovable work-supporting lates which engage and support' the wor from beneath upon opposite sides of the freely-journaled ridgeformin disk 60 just referred to. The outer one 0 these work-sup orting plates com rises an arm 65, formed with an inwar ly presented oke shaped head or widened portion 66, havin a work-supporting rib 67. The arm is ormed with openings through it to receive the retaining- .

screws

68 and 69, which are formed with spheroidal heads. The openings through the arm 65 are countersunk with s heroidal recesses to receive the heads of said screws and are enlarged to loosely inclose the screws,

so as to allow the ork-supporting plate to rock on its longitu inal axis to a limited extent. The

screws

68 and 69 are threaded into the integral projection 70 of the worksupporting horn 55, and confined u on screw 69 between the projection 70 and t e arm 65 is an expansion-spring 71, which retains the work-supporting rib 67 in its raised position with a yielding pressure. The work-supportin rib 67 at the inner end of the arm 65 1s bevtfied outwardly slightly with its highest edge resented inwardly adjacent to the line of stitching. When the work-supporting plate 65 66 is depressed by the passage of the work over it, the central portion of the beveled rib 67 of the late is depressed into'the annular groove of the hub 60. The yoke shape of the plate 65 66 is for the pur osc of fittin around by 62, and thereby al ow rib 67 to e depressed.

is the inner or main work-supporting plate formed integral with its supportingarm 76. This inner work-supporting plate 75 is formed with a beveled work-supporting rib 75 with its hi hestedge ad'acent to the line of stitching and arranged to it up into the main 0 ening of the presser-foot hereinafter referret to. The right-hand or lower end of the arm 76 is formed with a spherical socket 78, which rests over the spherical head 79 of an adjustable thrust-bearm in the form of a screw 80, which is threadet through the lug 81, formed integral with and projecting beneath the work-supporting plate 40, a nut 82 being threaded upon the outer end of the screw for locking it in the desired adjusted osition. The work-supporting plate 40 is ormed with a slot 85 extending throu hit adjacent to the cylindrical born 55 to a low the arm 76 to pass from beneath through the work-supporting plate 40, as shown. The

cylindrical horn 55 is out awa as above stated, to allow room for the epression of the work-sup orting plate 75 A screw 86 passes throng an opening 87,formed in arm 76 and is threaded into the integral lug 88 beneath the horn 55, said screw 86 having a spheroidal head which engages the spheroidal enlar ement or socket formed at the outer end 0% the o ening 87 through the arm 76, so as to allow with the ball-and-socket joint at the end of arm 76) the work-supportin plate to rock laterally upon its longitudina axis. A stifl spring 90 is confined upon the screw 86 between the In 88 and the arm 76 for sustaining the wor -supporting plate 75 in elevated osition in engagement with the presseroot.

The operation of these arts will be hereinafter more fully explaine after the complete description of the machine.

is the presser-foot, removably secured by screws 101 to the forward web portion of a yoke 102 which is formed with rearwardlypresented lugs 103, which are pivoted upon set-screws 104, mounted in the downwardl projecting lug 105, formed integral with tile machine-arm 5. 106 is a torsional spring coiled around a reduced portion or hub of the lug and engaging atone end a pin 107, ro-

' jecting from lug 105, and at its other en beneath the rocking yoke 102, thereby giving the presser-foot a spring tendency to rise away from the work-supporting plate just described.

The presser-foot is formed with a main longitudinal slot 110, throu h which the ridge of the work is ressed by t e work-supporting plates and ri ge-forming disk for the operation of the feed and needle and an auxiliary longitudinal roove -l11 to allow for the movement of the looper in moving rearwardly to deliver the loop to the needle. The presser-foot plate also has a transverse needle-groove cut in its upper face and a small perforation 112 to allow for the depression of the needle-guide 180 when the needle enetrates the goods and also to receive the ower end of the needle-guide and allow for the elevation of the presser-foot during the feedingstroke.

The s ring 106, acting upon the pivotallyinounte presser foot, normally tends to raise the presser-foot away from the worksupport. To force the presser-foot down against the work on. the supporting-plates and disk, I provide a yoke 115, projecting from the u per face of the presser-foot and formed wit a central dip or depression at 115' which yoke is engaged by a grooved antifriction-roller 116, mounted upon a pin 117, projecting from a short rockarm 118, journaled u on a lu 119, projecting beneath and forme integra with the. bearing 6 on the arm 5. The pin 11? also carries an antifriction-roller 120, which runs upon the perlpher of a cam 121, keyed to the forward end 0 the needle rock-shaft 15, between the bearin 6 and the needle-carrying rock-arm 16. is cam 12] is so positioned upon the needle rock-shaft that the high portion of the cam will depress rock-arm 118 and through it the resser-foot just rior to the penetration 0 the needle into tlie work, and the low portion of the cam will allow the presser-ioot to be raised by the action of its spring just at the commencement of the feedingstroke of the feeding-dog presently to be described.

In place of the under roller-feed mechanism heretofore employed in my machine I have arranged an effective reciprocating feeding device which engages the work upon its upper face. This device will now be described.

I em lay a twopart feed-do 130 131, each part 0 which is formed wit two arallel rows of serrations or teeth on its un er surface and arranged to engage the work in front and in rear of the path of the needle. This two-part feed-dog is preferably formed integral with and pro'ectslaterally from a supporting-arm 132, w ich is secured, by means of screws, to the forward end of a longitudinally-movable rocking arm or bar 133. This armor bar 133 is formed between its ends with an elongated slot or opening 134, inclined slightly from the horizontal. An antifriction roller 135 is supported u on one of the set-screws 104 from the mac inc-frame lug 105 and engages in the inclined elongated slot or opening 134 for supporting the arm or bar 133, with the feed-dog in operative position. The rear end or bar 133 1s formed with a yoke 136, which embraces an eccentric 137, keyed to the main driving-shaft 10 of the machine b which the feed mechanism is operated. his eccentric will cause the arm or bar 133 to reciprocate forwardly and backwardly and rock slight] u on its pivot-roller 135 to raise and lower t e eed-dog. Theinclined slot 134, moving over the antifrictionroller 135 during the reciprocation of arm or bar 133, serves to counteract the lifting of the dog on its feedin -stroke and increasing the lifting action on its return stroke. The

move out of the feed-dog under the action of the eccentric as modified b the inclined slot and rollersup ort, will e -a feedingstroke in a straight me in a horizontal plane and a return stroke in an arc. The tworows of teeth upon the feed-dog 130 and 131 engage the work in slot 110 of the presser-foot irectl above the ribs 67 and of the indepen ently-yielding work-supporting plates above referred to. a

It will be observed that the resser-foot and operating mechanism and t e feed-dog and operating mechanism are mounted upon the machine-arm 5 above the work-supporting frame and as compaetl as possible in or adjacent to the vertical p ane of the line of feed, so that the feed-frame is entirely free and unobstructed. This arrangement, to-

tity of work increased is one of the most important features of my present invention.

Freely journaled in the bearing 8 of the machine-arm 5 is a rock-shaft 140, carrying at its inner end a depending rock-arm 141, to the lower end of which is pivoted at 142 the forward end of'the link 143, which is formed at its rear end with a yoke 144, embracing an eccentric 145, kc ed to the main shaft 10. At the outer end of the rock-shaft 140 is keyed the depending rock-arm 146, upon which the looper is journaled and by which the looper is operated. The rock-arm 146 carries at its lower end an outwardly projecting journal-stud 147, which preferably has a threaded inner end to provide a convenient means for attaching it y to the rock-arm. Freely-j ournaled upont'he stud 147 is a journal-sleeve 148; which is confined u on the stud between the rock-arm 146 an the head of the stud.

150 is the main body portion of the looperrod. This body portion 150 is formed with a central circular opening 151, which loosely surrounds the bearing sleeve 148. The ice er-rod body is pivotally mounted upon said sleeve by means of the diametrically oppcsite coneointed center screws 152, which are threaded through the lower and upper walls of'the central portion of the looper-rod body 150 and are seatedin diametrically 01ppcsite cone-shaped recesses formed in t e 1ournal-sleeve 148. These center screws 152 are preferably provided at their outer ends with small lock-nuts 153 for securing them in the desired adjusted position in en a ement with the sleeve 148. By reason 0? t e pivotal connection between the loo er-rod body 150 and the 'ournal-sleeve 148 it will be observed that the looper can be rocked u on its pivots in an approximately horizonta plane in addition to its vertical oscillatory movements upon the journal-stud 147, as just described.

The looper-rod body portion 150 is also formed with an inwardly-curved forwardlypro'ectin'g arm 155, formed at its front end wit a socket which receives the shank of the looper roper, 157, the looper being secured in the sec at by means of set-screw 156 passing through suitably-threaded ears of the under split portion of the socket. The looper roper is formed of a single prong 157, havmg the thread-engaging shoulder 157* and a curved cut-out or depressed portion 157 behind said shoulder to allow for the passage of the needle.

y The looper-rod body portion 150 is also formed with a rearwardly-presented socket arm 158, into the socket of which is threaded the forward end of the tail-rod 159. A lookin -nut 160 is also threaded upon said tailro 159 to clamp it in position upon the body portion.

As above explained a crank-disk 13 is mounted upon the on of the driving-shaft 10. This crank-disk 13 has projecting from at an angle of about forty-five degrees an 'arm 165 w ich supports a crank-pin 166, extendin at right angles from the arm 165. J ourna ed upon the crank-pin 166 is a sleeve 167, having diametrically op osite coneshaped bearing-sockets, in who are seated the coneointed center screws 169, which are threa ed throu h the side walls of the loo or yoke 170 For pivotally connecting sai yoke with the journal-sleeve 167. The loo or yoke 170 has formed integral with it an extending forwardly from it adjacent to its lower ed e a bracket-arm 171,forrned with the integra journal-sockets 172, inwhich the guiding tail-rod of the loo er is freel journaled, so as to reciprocate ongitudina ly and oscillate therein. The integral yoke 170, bracket-arm 171 and bearing-sockets 172 constitute what Iterm a floating bearin for imparting the lateral and a part of t e vertical movements to the looper proper, said floating bearing being operated y the universal-joint connection and crankpin above referred to.

175 is the usual thread-tension device.

180 is a vertically-movable needle-guide formed with an inwardly and forwardly curved finger having a needle-groove in its face. The lower end of this needle-guide rests directly above the o enin g 112 in the presser-foot and is ada te to intermittently rise and fall into gui ing contact with the needle and away from the needle. This needle guide has an upwardly-projecting guidestem 182, which is supported in the integral socket-bearing lugs 183 of the sewing-machine arm and carries an inwardly-curved arm 184, secured to it by screw 185 and projecting over above a controlling-cam 186, which is keyed to the needle rock-shaft and formed inte al with the cam 121, above referred to, W ich controls the sieve-- tion of the resser-foot. The spiral spring 187 is confined between the hub of; arm 184] and the upper bearing 183 to give the needleguide 180 a normal tendency to move downward] and holding the arm 184 in contact with t e controlling-cam 186.

The operation of the im roved machine may be briefly described as ollows; The machine is primarily intended to mm nsh what is known as oversea blindstitching-work, which at is, of s ti tgiinglis most commonly emplove in seaming t e lower edges of trousers-legs, skirts, an other garments of tubular form. The material to be sewed is first folded at one edge to form a hem of the desired depth and by depressing the s rin -sustained work-supporting frame is t en inserted in the machine above the worksupportin ribs 67 7 5 and the rid e-forming disk 60, t e turnedup portion or em of the material-that is, the double thickness of the work-being placed to the right just above the work supportin plate 75. When the pressure is removed om the work-supporting frame, said frame returns to its normal horizontal or raised position and causes the ribs 67 and 7 5 of the yielding work-supporting plates and the freely journaled ridgeforming rib to force a ridge of the material up into the main longitudinal slot 110 of the presser-foot, the disk 60, which engages the work directly beneath the turned-over edge of the hem, forcing the material directly above it slightly beyond the parts of the material sup orted by the yielding lates. The needle osci lating transversely o the line of feed penetrates the raised portion or ridge of the material just above the rib 67 at one sideand passes through the material supported on the ridge-forming disk 60 and emerges at a point just above the rib 7 5 and carries the loop of the thread to the right of the point from which the needle emer es. starts to return throu the material the looper, moving forwar on the right-hand side of the line of stitching, takes the loop from the needle and, While the needle is comletin its return'movement in withdrawing om t e material, carries the loop across the line of stitching to the left and starts to re cede and move downwardl to present the loop in open position direct y in the path of the needle, which at the proper moment again moves forwardly, entering the loop and again piercing the materialfas just e lained, for

another stitch, which is accomplished in the same manner. Whilethe looper is movin across the line of stitching from right to le t to present the loop to the needle, the presserfoot is raised from the work-supporting plates and the feed-dog is given its feeding stroke, the material being freed from the pressure of the resser-foot during the time that the feed-dog is making its active stroke. Immediately after the completion of the working stroke of the feed-dog the resser-foot is ain clamped securely upon t e material to old it firmly while the, needle penetrates the work. After the looper has delivered the loop to the needle it is moved from the lefthand side of the line of stitching over to the right-hand side of the line of stitching in readiness for another forward stroke, as ex plainecl, and during this same time the feeddog is making its return stroke out of enga ement with the work in readiness for anot er feeding stroke. As the needle starts forward to penetrate the material the needle-guide is As the needle raised by its cam, so that the grooved guidingfinger engages and guides the needle until its point has completely penetrated the work, when the needle-guide is automatically lowered out of contact with the needle by the action of its sprin when released by the cam to allow the need e rock-arm to accomplish its full upward stroke. In the passage of the work through the machine the yielding worksupportin plates 67 and 75 will effectively support t e work upon opposite sides oi the line of stitching, which 1s defined by the freely-jo'urnaled rid e-formin disk 60. Any inequalities in the t 'ckness o the work-as, for instance, in crossin seams-'will be accurately accommodated y the yielding plates, with the result that the needle will penetrate the work uniformly, catching the material at a sufficient depth for. each stitch to effectively sew the two parts of the material to ether. The a pearance of the work produced by this machine with the inde endently-yielding suporting plates and fieelyjournaled ridgeorming disk will be uniform throughout. The freely-journaled ridgeforming disk of small diameteraffords an effective means for proiectin a: rid e of the material into the ath of t e nee lo, and as the disk rotates eely as the material passes over it it will be clear that a new part of the peri hery of the disk will be presented beneath t e needle for every stroke of the needle, thereb avoiding the unequal wear of the disk,whic with the employment of the forms of ridge-forming ribs heretofore used has resulted in the formation of grooves in the rib and the consequent improper stitching of the machine.

As stated above, the forward and backward movements of the looper and partly its vertical vibration are caused-by the oscillations of the suspended rock-arm on which the looperbody is journaled, while the transverse movements of the looper from one side of the line of stitching to the other, and artly the vertical vibrations are caused by tl ie laterally-swinging floating bearing actuated by the eccentric crank mechanism.

The simplicity of the feed device is an important feature of my present machine, the

construction being such that the equivalent of the four-part feed motion is accomplished from a single eccentric, the roller and inclined slot-support of the feed-bar counteracting the vertical movement of the feed-dog on its feeding stroke to maintain it in effective engagement with the material and the same support exaggerating the raisin of the feeddog away from the material on t e return inactive stroke.

The specific improvements in the feed mechanism and in the stitchforming mechanism described and illustrated inthe present case are fully claimed in my co ending divisional applications serially num cred 226,547

and 226,548, both filed on the 29th of Septcmbe, 1904.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a resser-foot, a work-supporting frame, and a pair of independently-yielding work-supporting plates mounted uponsai frame beneath the presser-foot, the effective work-engaging portions of said platesbein presented upon opposite sides of and paralle with the line of stitching.

2. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a prosser-foot, a feeding device, a work-sup orting frame, and two independently-yie ding work-supportin plates mounted upon said frame beneath t e presser-foot and extending oppositely from the line of stitchin and inclining downwardly from the lane 0 feed, each plate being formed with a orizontal work-engaging rib adjacent to and parallel with the line of stitching.

3. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a presscr-foot, a work-supporting frame, and two approximately horizontal independently-yieldin work-supporting ribs mounted upon said frame and presented thereby beneath the presser-foot one upon each side of theline of stitching, substantially as set forth.

. 4. In a blindstitch sewing-machine, the combination of suitable, stitch-forming mechanism, a presser-foot, a work-supporting frame, and two yielding work-sup orting ribs mounted independently upon sa1 frame and presented thereby in horizontal position beneath the press'er-foot one upon each side of the line of stitching and both parallel with the line of stitching, each of said ribs being caable of moving bodily away from the presseroot and rocking longitudinally of the machine under the action of the material pass ing through the machine, substantially as set forth.

y 5. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a slotted presser-foot, a work-supporting frame, a freely-journaled ridge-formin disk mountedu on said frame 'and presents thereby beneat the Presser-foot in position to force a ridgeof material through the slot sk and of being 35 the pn ing work-supporting plates mounted u on said frame u on opposite sides of said (1sk and indepen ently of the disk and of each 1 other, said frame presenting said disk and said plates beneath the presser-foot, substantially as set forth.

7. In a blindstitch sewing-machine, the

. combination of suitable stitch-forming mechanism, a resser -foot, a worksupporting frame, a ridge-forming disk freely journaled upon said frame, and two yielding normally horizontal work-supporting ribs mounted inde endently upon said frame one upon each side; of said ridge-forming disk in parallel vertical planes, each of said ribs being capable of yieldm bodily away from the resser-foot and rot-firing longitudinally of the machine un der the action of the passing material, substantially as set forth,

8. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a resser-foot, a work-supporting frame, an two spring-sustained work-sup porting plates mounted independently upon said frame upon opposite sides of the line of stitching, each of said plates extending laterally from the line of stitchingrand being capable of yielding bodily away om the presserfoot and rockin u onitslon itudinal axis under the action 0 t e materia V passing through the machine, substantially as set forth.

9. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, .a presser-foot, a work-supporting frame, 'and two Work-supporting plates mounted upon said frame upon opposite sides of the line of stitching, each of sai plates extending laterally from the line of stitching and being formed with a horizontallyepresented raised rib which is capable of moving bodily'awa from the presser-foot and rockin upon t e longitudinal axis of the late, su stantiall 'as and for the purpose set orth.

10. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a presser-foot, a work-supporting frame, and two work supporting plates mounted upon said frame upon-opposite sides of the line of stitching in planes inclined to the horizontal, the highest parts of said plates formed into horizontal ribs arranged adjacent to and parallel with the line of stitching and capable of moving bodily. away om the presser-foot and rocking longitudinal of the machine, substantially as and for ose set 'forth. 11. n a blindstitch sewing-machine, the

combination of suitable stitch-forming mechanism, a l resser-foot, a work-supporting frame, yie dingl -mounted work-supporting plates arrange upon said frame upon opposite sides of the line of stitching, a screw passing through each of said plates into the suporting-frame and formed with a spheroidal liead, and an expansion-spring upon each of said screws between the late and the supporting-frame, substantial l as set forth.

12. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a presser-foot, a work-supporting frame, two yieldingly-mounted inclined worksupporting plates arranged upon said frame upon opposite sides of the line of stitching, each of said plates being formed with a horizontallyresented work-supporting rib ad j a cent to t e line of stitching, screws or )ins one of whichpasses loosely through each of said plates and is secured in the supportingframe s heroidal engaging surfaces formed on the eads of said screws or pins and in said plates, and an expansion-s ring upon each of said screws between the p ate and the supporting-frame, substantially as set forth.

13. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a presser-foot, a work-supporting frame presented beneath the resser-foot, a yielding work-supporting p ate mounted upon said frame, a universal bearin connecting one end of said plate with said frame, a screw passing through said late into the frame and formed with a spheroidal head, and an expansion-spring confined upon said screw between the plate and said frame, substantially as set forth.

14. In a blindstitch sewingunachine, the combination of suitable stitch-forming mechanism, a presser-foot, a work-supporting frame presented beneath the presser-foot, a yielding work-supporting plate mounted upon said frame and formed with a rib at the inner end adjacent to and parallel with the line of stitching, a universal bearin connecting the outer end of said plate with said frame, a screw passing through said plate into the frame and formed with a spheroidal head, a spheroidal socket in the plate in which said head is seated, and an expansion-spring confined upon said screw between the plate and said frame, substantially as set forth.

15. In a blindstitch sewing-machine, the combination of suitable stitch-forming mechanism, a presser-foot, a worksupporting frame presented beneath the resser-foot and formed with a laterally-extending slot, a yielding work-sup orting plate mounted upon said frame ant rojecting through said slot, a horizontal rib ormed on the inner end of said plate and extending horizontally parallel with the line of stitching, a universal bearin connecting the outer end of said plate )eneath said frame, ascrew passing through said plate into the frame and formed with a spheroidal head engaging a corresponding socket in the plate, and an expansum-spring confinedupon said screw between ghetplate and said frame, substantially as set 16. In a blindstitch sewing-machine, the combination with suitable stitch-forming mechanism, a presser-foot, a spring-sustained work-supporting frame formed with a laterally-projecting born, a ridge-forming disk freely journaled upon a lug of said horn, yielding supporting-plates mounted 1.1)011 said frame upon opposite sides of said ri geforming disk, and springs confined between said work-supporting plates, and frame, substantially as set forth.

17. In a blindstitch sewing-machine, the combination with suitable stitch-forming mechanism, a resser-foot, a spring-sustained work-supporting frame formed with a laterally-projecting horn, a ridge-forming disk freely journaled upon a lug of said horn, yielding supporting-plates mounted upon said frame and extending laterall upon opposite sides of said ridge-forming disl ,r1bs upon said plates arranged adjacent to said disk parallel with the line of stitching, and springs eonfined between said work-supporting plates and frame, substantially as set forth.

18. In a blindstitch sewing-machine, the combination with suitable stiteliforming mechanism, a work-supporting frame carrying suitable Work-engaging ribs, a presserfoot pivotally mounted upon the machine frame,'a spring arranged to move the presserfoot away from the Work-supporting ribs, and a cam arranged to force the presser-foot down into engagement with the material supported upon said ribs, substantially as set forth.

19. In a blindstiteh sewing-machine, the combination with suitable stitch-forming mechanism, a work-supporting frame, a presser-foot pivotally mounted upon the machine-frame, a spring engaging the presserfoot and adapted to move it away from the work-supporting frame, a yoke projecting from the resser-foot, means operating 11 on the yoke adapted to force the presseroot down into engagement with the material above said frame and time the movement of the presse'r foot away from the frame, substantially as set forth.

20. In a blindstitch sewing-machine, the combination with suitable stitch forming mechanism, a work-supporting frame, a presser-foot pivotally mounted upon the machine-frame, a spring arranged to move the presser-foot away from the work-supporting frame, a yoke or projection extending from the presser-foot, a rock-arm'carryin a stud which engages said yoke, an anti ictionroller journaled upon said rook-arm; and an oscillatory cam engaging said antifrictionroller and adapted to force the presser-foot down into engagement with the material above said frame and time the movement of the resser-foot away from the frame, substantially as set forth.

21. In .a blindstitch sewing-machine, the combination with suitable stitch-forming mechanism and a presser-foot, of a worksulpporting frame, an approximately liorizon ta ielding work-engaging rib mounted upon said frame beneath the presser-foot and caable of moving bodily away from the )resser Foot and of rocking longitudinally of t e machine under the action of the passing material, and a reciprocating feed-do engaging the work above said rib, substantially as set forth.

22. In a blindstiteh sewing-machine, the combination with suitable stitch-forming mechanism, and a resser-foot, of a worksupporting frame, two horizontally-presented yielding independent work engaging ribs mounted upon said frame upon opposite sides of the line of stitching, and a reciprocating feed-dog having two rows of serrations or teethengagmg the work above said yielding ribs, substantially as set forth.

CHARLES A. DEARBORN.