US1296514A - Blindstitch sewing-machine. - Google Patents

Description

T. J. HAYES.

BUNDSTIICH SEWING MACHINE.

- APPLICATION F|LE D JUNE 19- l9l 5.

Patented Mar. 4, 1919.

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'T. J. HAYES. BLINDSTITCHQ SEWING MACHINE.

APPLICATION FILED 1UNE'19. l9 l5.

Patented Mar. 4,1919.

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Inventor. Thomas -J.Hc1y es, 7% Mad At Iy's.

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T. .I. HAYES.

BLINDSTITCH SEWING MACHINE.

APPLICATION FILED JUNE 19. I915.

1,296,514. Patented Mar. 4,1919.

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by M M k fM AIIy's.

T. JHHAYES.

BLINDSTHCH SEWING MACHINE.

APPLICATION FILED JUNE 19, 1915.

Patented Mar. 4, 1919.

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T. J. HAYES} suwnsmcu sswms MACHINE. l APPLICATION FILED JUNEIQ I915. I 1 29 614, Patented Mar. 4,1919

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InvenTor. Thomas J. Hayes By fewJMkM I Aflys.

Enron.

THOMAS J. HAYES, 0F ALAMEDA, CALIFORNIA, ASSIGNOR TO ARBETTER FIELLING MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

BLINDSTITCI-I SEWING-MACHINE.

Specification of Letters Patent.

Patented Mar. 4, 1919;

Application filed June 19, 1915. Serial No. 35,079.

To all whom it may concern:

Be it known that I, THOMAS J. HAYES, a citizen of the United States, and resident of Alameda, county of Alameda, State of California, have invented an Improvement in Blindstitch Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a specification like characters on the drawing representing like parts.

This invention relates to improvements in blind stitch sewing machines, particularly of the Arbetter type which are used for felling a superimposed layer upon a base layer of fabric and in which alternate rows of stitches are made in the base and superimposed layer by a curved and oscillating needle which is also given a lateral vibration intermediate of successive stitches.

In blind stitch felling machines which have hitherto been made the successive stitches are made alternately in the base layer and in the superimposed layer, the edge of the latter being rolled over upon the setting of the stitch by the takeup mechanism in such a manner as to partially or substantially wholly cover the stitches.

When this operation is performed upon thin fabric or upon those which are loosely woven the stress placed upon the stitch in the superimposed layer causes a pulling of the threads at substantially right angles to the edge forming undesirable wrinkles or checks in the fabric.

One of the objects of the present invention is to overcome this checking of the superimposed layer by causing the needle to penetrate the base layer upon every stitch so that in laying alternate stitches the needle will upon one set of stitches, first penetrate and emerge from the base layer, then after having been moved laterally or shogged will enter the base layer and passing therefrom penetrate the under surface of the superimposed layer emerging from the'latter at or beneath the edge thereof.

By thus forming the successive sets of stitches the thread will at all times be 'an chored in the base layer and the superimposed layer will be drawn down upon the base layer more directly avoiding the=rolling and the checking of the. superimposed layer which has heretofore been unavoidable.

Another defect which has been present in the blind stitch sewing machines for felling which have heretofore been made has been the inability to produce a sufliciently Another object of the invention is therefore to provide means for presenting the work to the needle which will have a greater amplitude of movement to permit the free passage of goods with thicker seams, or

TlllS 1s accomgreater thickness of goods. plished in the present invention by providing a novel feeding mechanism in which the relative movements of the feeding dog and yieldable work support are greater than has heretofore been accomplished, and by providi ng bender mechanism in which the bender is actuated by a series or succession of differential mechanisms which give a greater amplitude of movement to the bender and are so timed as to cause the bender to dwell, at its highest elevation during the engagement of the needle with the fabric and then to be very rapidly depressed out of the way of the feeding mechanism when the latter is actuated to advance the goods, a similar dwell and rapid rising motion being also accomplished during the remainder of the cycle of the bender mechanism.

Another object of the invention is to provide a more delicate bender adjusting mechanism to adapt the machine for use upon very thin fabrics; and to provide means lying'above the bed plate of the machine, and readily accessible to the operator for adjusting the bender mechanism.

Other objects of the invention will more fully appear from the following description and the accompanying drawings and will be pointed out in the annexed claims.

' The drawings illustrate one of the preferred embodiments of the invention but it will be understood that various modifications may be madetherein within the spirit and scope of the subjoined claims.

In thedrawings:

Figure 1 is a side view largely in section of a sewing machine embodying the preferred form of my invention,

Fig. 2 is a plan view of portions of the driving mechanism for the feed and bender, the base plate having been removed but its relation thereto indicated in dotted lines and the supports for said actuating mecha-v nismsbeing-indicated also in dotted lines.

Fig. 3 is a detail plan view of the bender mechanism removed from the machine,

Fig. 4 is a front elevation of the same,

Fig. 5 is an end view of the bender mecha* nism showing its relation to the base plate and the means for adjusting the bender mechanism.

Fig. 6 is an end view of thevbed plate of the machine showing the feeding mechanism and the manner in which it is supported upon the bed plate Fig. 7 is a detail plan View of the bender mechanism removed from the machine.

Fig. 8 is a perspectiveview of the form of seam adapted to be constructed by the mechanism disclosed" therein, and,

r Fig. 9 is a perspective view of said seam showing the threads in full lines and the base and superimposed layer in dotted lines, the points of penetration and emergence of the'loops of needle thread being indicated by short linescrossing the lines of needle thread.

. usual hand wheel 9 and driving pulley 10.

In the preferred embodiment herein the oscillating needle mechanism is supported upon a link 11 which may be formed in adjustable sections and which is pivoted upon a stud'12 in the upper portion of the head of the machine, the lower portion of said link. being enlarged and offset and provided with yokes..12 and 13- disposed 'at right angles to each other and-adapted pivotally to support the'curved needle and the mechanism for actuating the same.

A- curved oscillating-needle 14: is preferablyinounted in theend: of a needle bar 15 which is pivotally mounted in'the yoke, 13 and has a laterally extending member 16 totwhich is connected a link 17 pivotally attached to a stud 18 upon a sleeve or cross head 19 which is'reciprocably mounted upon a shaft '20 carried by thexyoke l-2., The

sleeve or cross head 19 is actuated through V a lever 21, which is connected by a' link 22 to said cross head. The lever 21 is pivotally mounted upon a stud 23 extending laterally from the link 11 and is actuated by a link 24 which may be adjustable in length and is connected to the central portion of the lever 21 by a universal joint 25 the upper end 7 of the link 24 being preferably in the form ofa yoke forming a strap 26 surrounding a cam 27 upon the end of the driving shaft 8.

In the operation of the machine, thereciprocation of the link 24 by the cam 27 will cause the vibration of the lever 21 thus reciprocating the sleeve or cross head. 19 upon its shaft 20 and consequently'recipro eating the link 17 which is attached to the 7 arm 16 of the needle bar so that the needle will be oscillated in a circular path.' In order to provide for the easy insertion of the needle beneath and beyond the edge of the superimposed fabric the supporting mechanism for the needle is preferably arranged. in a plane inclined to the work supporting surface of the work support asillustrated in Fig. 1, and it will be readily understood that when in this position the needle may enter beneath'the edge of the superimposed layer far more easily than if it were oscillated in a plane perpendicular to the work supporting surface of the work support. 7 I

The lateral or shogging motion is imparted to the needle in the preferred embodi:

ment of the invention disclosed herein through a floating link 28 which may be formed in two sections 2828- .adjustably connected by screw and slot connection 29, the portion 28 of the floating link being bifurcated at its rear end to forma yoke 30 adapted to embrace a cam 31 upon a countershaft 32 actuated from the main shaft through suitable gears 33 and 34.

j The amplitude of adjustment of the float? ing link may be controlled through an adjusting mechanism comprising a stud 35 upon the portion 28 of said floating link which is connected'by a link 36 to one end 37 of a bell crank lever which is mounted upon a pivot 38 extending from the boss which carries the bearing 6 the outer arm 39 of said bell crank lever beingadjustab'ly mounted in a suitable slotinthe arm of the machine. By adjustingthe position of the arm 39 and the link 36 relative to the longitudinal axis of the link 28 the amount of reciprocation imparted to the lever 28'by the cam 31 may, be adjusted so thatthedistance between the parallel rows'of stitching V maybe accurately determineds' .Any suitable take-up mechanismflmay be 7 provided of the usual character, illus- 'trated herein the take up comprisesa bar 40 mountednpon a suitablepivot fill in the forwa'rd'part of the armand provided with a laterally extending arm 42 having a stud 43 engaging a groove 44 in a cam cylinder 45 secured to the main shaft.

If desired an upper feeding mechanism may be provided. As illustrated herein said feeding mechanism may comprise a feed dog 46 actuated from a cam 47 upon the main shaft through suitable mechanism, such as that illustrated in my Patent No. 1,225,628,- granted May 8,1917. This forms no part of the present invention and is therefore not illustrated herein.

The feeding mechanism may be actuated through suitable cams upon the main shaft as illustrated in Fig. 1. The cam 50 operating through the link 51 and the arm 52 of the rock shaft 53 serves to raise and lower the feed dog in a manner which will hereinafter be described while the cam 54 operating through a floating link 55 adjustable through a link 56 and bell crank mechanism 57 such as that above described and connected to the arm 58 of the rock shaft 59 serves to cause the backward and forward movement of the feed dog which is adjustable by the mechanism afore said for the purpose of determining the distance between successive stitches' The bender mechanism may be actuated from the main shaft 8 through the gears 83, 34 and the countershaft 32. In order to provide for a reciprocation of the bender for each oscillation of the needle a gear 60 of equal diameter to the gear 84 is provided upon the lower end of the countershaft 82, said gear being in operative engagement wlth a gear 61 upon the end of a shaft 62 rotatably mounted in lugs depending from the under surface of the bed plate. This shaft for operating the bender desirably is a divided shaft the sections 6268 being provided with arms 64 and 65 extending laterally in different planes and connected by a link 66 adapted to transmit a differential movement from the shaft 62 to the shaft 68 thus transmitting a variable movement to the cam 67 which operates the bender.

The cam 67 desirably is of a special construction having a concentric portion 67 of about thirty degrees to provide for a dwell of the bender at its highest elevation. The remaining portion of the cam is constructed in such a manner as to cause a very rapid raising and lowering of the bender. The bender cam 67 engages and operates within a yoke 68 which may conveniently be pivoted upon the sleeve 69 surrounding the shaft 59 one arm of the yoke being provided with a stud 70 to which a link 71, which may be in the curved form illustrated in Fig; 5, is attached and which serves to raise and lower the bender through an. adjustable differentially operating lever mechanism.

This lever mechanism in the preferred form of the invention illustrated herein comto an extent supports the bender.

prises a lever 7 2,illustrated in dotted lines in Fig. 5, and in full lines in Fig. 3,which is pivoted upon a stud or screw 7 3 extending from a web 74 depending from the under surface of the bed plate 1.

The bender is supported upon one end of a lever 75 which is pivotally mounted at the opposite end upon a stud 76, preferably in substantial alinement with the stud 7 3, carried upon the lower end of a hanger-7 7 which is supported upon an eccentric 78 pivotally supported upon a shaft 79 journaled in suitable bearings depending from the under surface of the bed plate, the shaft 79 being provided with a milled disk 80 projecting above a downwardly curved guard plate 81 covering an aperture 82 in the rear portion of the bed plate of the machine. The guard plate 81 may be formed of stamped sheet metal, the portion which is cut out to form a slot for the milled disk being bent downwardly to form a pawl adapted to engage the disk 80 and retain it'in adjusted position.

The lever 75 is provided at its rear end with a slot 83 receiving the stud 7 6 so that the lever 75 may have a slight longitudinal motion to compensate for its adjustment relative to the actuating lever 72. The lower central portion of the hanger 77 is provided with a slot or recess 84, the vertical walls of which may be provided with hardened sur face plates 85, theopen end being covered by a plate 86 providing a guideway for a stud 88 projecting laterally from the web 116. The lever 72 which is connected to the link 71 of the cam yoke is pivotally connected intermediate of its ends to the lever 75 by a suitable screw or stud 89.

The oscillation of the cam yoke 68 raises and lowers the link 71 and with it the end of the lever 72 causing the simultaneous vibrati on of the lever 75 which is connected to the lever 72 through the stud 89 thus raising and lowering the outer end of the lever 75 which By adjusting the position of the hanger 77 through its eccentric 7 8 which is rotatable through the milled di k 80, the relative positions of the longitudinal axes ofthe levers 72 and 75 may be varied and consequently their relation to their pivotal supports so that the end of the lever 75 which supports the bender may be raised and lowered to provide for suitable adjustments of the bender relatively to the work supporting surface of the work support to accommodate different thicknesses of fabric.

The lever 75 and yoke 95 carrying the bender are maintained in their proper positions by the guidance of the stud 88 in the slot 84 so that the vertical position of the bender is maintained notwithstanding the pivotal adjustment of the hanger '7 7 It is of course necessary that the bender may be provided with a yielding support so that the mechanism may not be broken if the bender encounters an unyielding object or its operation. is otherwise interfered with in any unusual manner. In order to provide for this function a yielding mechanism is interposed between the end of the lever 75 and the standard in which the bender is mounted.

, Any desirable yielding connection may be used. As illustrated herein the end of the lever 75 is pivotally attached to a rectangular block 90 having a vertical cylindrical aperture therethrough to receive a. pin 91 which is secured to the block 90 in any suitable manner as by a set screw 92. The pin 91 extends through the arms 93 and 9-1 of a yoke 95 which is larger than the block 90 so that the latter may move a suflieient distance within the yoke to permit the depression of the bender when the latter meets unusual resistance without breaking the bender or its actuating mechanism. The block 90 is normally maintained in contact with the arm 93 of the yoke by a helical spring 96 which surrounds the pin 91 and bears at one end upon the arm 93 and at the opposite end against set nuts 97 on the pin 91'. The yoke 95 is provded with a lateral extension or'boss 98 which is vertically apertured to receive the cylindrical stem 99 of the bender 100, said stem beingclamped therein by a suitable set screw 101. It will be obvious thatby reason of the above construction if any'hard object is encountered by the bender the block 90 will move away from the arm 93 of the yoke 95 against the compression of the spring 96 so that breakage of the mechanism will be avoided.

In the operation of the mechanism the bender is raised and lowered in synchronism with every oscillation of the needle. By reason of the difierential movements of the bender shafts 62 and 63 the cam 67 is given an irregular or variable movement so timed which actuates the bender that it will rotate slowly during the period that the bender is at its highest elevation and by reason of the concentric surface of the cam when in such position the bender will have a relatively long dwell during the period in which the needle is passing into and withdrawn from the fabric.

When however the cam is' rotated sufficiently for the eccentric surface to become operable the rapidity of its movement'is in creased by the differential rotation of the shaft 63 so that the bender is very quickly depressed. This action isfurther accentu ated by the differential movements of the levers 72 and 75 which connect respectively withthe link 71 and the block 90 which sup ports the bender, so that'an exceedingly rapid downward movement of the bender is given. Furthermore the greater length of the lever 75 than that of the lever 72 causes an increased depression of the bender as well as thereof.

By the combined actions of these differential and variable mechanisms and the specially constructed cam the bender is so actuated that it will remain in the highest elevation for so long a period as is necessary to form the stitch and will be quickly depressed to a sufiiciently great distance beneath the feeding mechanism to permit the feed dog to pass over said bender without danger of interference even though a thick seamis being passed through the machine.

As heretofore stated one of the objects of the invention is to provide workhandling means which are adapted to permit the passage of thicker material than has been successfully handled in blind stitch sewing machines before. 7

It has been shown that the special form of bender mechanism is adapted for'this purpose but in order to insure the successful operation under such conditions it is necessary to have feeding mechanism providing greater rapidity in the movement greater relative movement between the feed dog and the yieldable work support than has heretofore been provided in machines ofthis character. I have therefore provided a special form of feeding mechanism adapted to be operated in combination with the bender mechanism aforesaid. This feeding mechanism comprises a yieldable presser 105 which conveniently may be in the form of a shoe 106 having a generally curved working face 107 supported upon a bracket 108 which if desired may be made integral with the head of the presser 105.

The work support and presser are preferably provided with two downwardly extending stems or standards 109 and 110 which are journaled in suitable bearings 111 and 112 in a substantially rectangular plate 113 which is secured by screws 114 to webs 115 and 116 depending.

from the surface of the bed plate.

ing block 117 attached by a set screw 118 to the stem 110 and having an eXtension'119 passing beneath to the plate 113 bearings 112 to retain the stems 109 and 110 in a position in which they will recipa guiding strap 121 secured 105 is normally maintained in, sition by a helical" spring 123 which encircles the stem 109 and is seated upon a screw threaded sleeve 124: provided with a milled head 125 whereby the compression of' regulated. The

,rigidly' by the head of the sewing machine.

In the feeding operation it is necessary that the presser shall be separated from its engagementwith the 'goods at the time the feed Aguidp 110 by screws 122 serves with the i V j 115' ro cate vertically in unison. The presser w elevated ponism and toggle mechanisnr. These mechanisms are simultaneously actuated to cause the relative movement between the feed dog and work support, aforesaid.

In the preferredembodiment of the 1nvention disclosed herein the feed dog 126 is bifurcated at its upper end and is provided with serrated faces 127, 128 adapted to reciprocate in. suitable grooves 129130 in the face 107 of the work support or presser 106, said head being offset if necessary as indicated in Fig. 7.

The feed dog 126 ispivotally supported at its lower end upon a stud or bolt 127 carried by the arm 128* of a bell crank lever which is pivotally mounted upon a stud 129 in a cross head 130 which is slidably mounted upon theistem 110 and is provided with a lateral extension or arm 131 passing beneath the strap 121 and adapted to reciprocate in the ways between said strap and the plate 113 tov which it is fixed. I

The arm 128 of said bell crank lever is substantially horizontal when in normal position as shown in Fig. 6, the other arm 132 of the bell crank lever extending upwardly and preferably slightly laterally and being preferably provided at its upper end with a stud 133 which serves asa pivot for a bell crank lever, one arm 134: of which is pivotally attached to a stud 135 upon the bracket 108 of the work support. The other arm 136 of said bell crank lever is provided with a stud 137 by which it is connected to the end of a link 138 which is connected at its opposite end to a'stud 139 at the end of an arm 1 10 uponthe rock shaft 53.

In operation the oscillation of the rock shaft 53 reciprocates the link 138 which rocks the bell crank arms 136 and 134. By reason of the fact that the pivotal support for the bell crank 134k and 136 is upon the end of the arm 132 of the lower bell crank which supports the feed dog the reciprocation of the link 138 oscillates the pivot 133 through an are about the stud 129 as a center. In other words the arms 1340fthe upper bell crank lever and 132' of the lower bell crank lever being pivoted [together form in effect a toggle connection between the work support or presser 105 and the sliding cross head 130*. Inasmuch as these arms in addition to beingtoggles are parts of bell crank levers operating respectively goods.

about the pivots 135 and 129 the relative movements imparted to the feed dog and work support are very much increased over those which would normally occur either from the action of the bell crank levers alone or from the action of the toggle links and furthermore the speed of relative movement between these parts'is materially increased as the bell cranks are oscillated upon either side of a central normal position. It there fore follows that when the presser or work support 106 is in contact with the under surface of the work, and clamping the same against the rigid presser foot which depends from the head of the sewing machine, the feed dog 126 will be very quickly lowered by the movement of the link 138 to the left, and that upon the movement of the link 138 to the right the feed dog will be quickly thrust into engagement with the under face of the work and further movement of the lever will promptly withdraw the presser 106 away from the Work against the action of the spring 123.

Not only will this motion be more rapid than in the usual feeding mechanism but the movement will be adapted to accommodate the passage of thick scams or thick The feed dog may be given its forward and backward movement in any well known manner. As illustrated herein the backward and forward movement thereof is accomplished by means of a link 1 11 connected at a point above the central portion of the feed dog supporting arm 126 and at its other end upon a stud 14:3 in the end of a lever 1424 upon the rock shaft 59.

The relative movements'of the rock shafts 53 and 59 are of course governed by the positions of the'cams 50 and 54 upon the main shaft of the machine so that the feed dog is only advanced after it is thrust into engagement with the under face of the work and'is retracted only after the completion of the feeding movement and when the work support has engaged the under surface of the work and clamped. the same against the presser foot in the'head of the machine.

The preferred form of seam adapted to be made by the mechanism above described is illustrated in Figs. 8 and 9 in which Fig. 8 is an exaggerated perspective view with the. superimposed layer drawn upwardly from the base layer sufficiently to display the lines of stitching. It however, is to'be understood that in the completed seam the tension upon the thread will draw the superimposed layer down upon the base layer so that the lines of stitching are "substantially or wholly concealed. r In Fig. 9 the concatenated loops of needle thread a and bobbin thread 6 are illustrated infull lines, whereas the base and superimposed layer are shown in dotted lines, the

enter and emerge from the superimposed layer being designated by short lines extending transversely of the full lineswhich designate the strands of the'loops of needle thread. 7 V V In the operation of the machine the oscillating needle first enters the upper surface of the base layer at the point a and without passing through the lower surface thereof emerges from the base layer at the point d inserting the needle thread a. The bobbin thread I; is then passed through the loop of needle thread a and upon the setting of the stitch by the takeup the concatenated loops preferably are drawn into the base layer.

In forming this stitch the needle oscillates in a plane which permits the point of the needle to emerge outside of, or beneatlnthe edge of the superimposed layer so that the stitch is formed only in the base layer. The work is then fed forward and simultaneously the needle shogged laterally farther beneath the superimposed layer and upon its next oscillating movement penetrates the base layer at the point e and without passing through the under surface of said layer emerges from the upper surface thereof at the point f whereupon it immediately en.-

ters the superimposed layer at the point '9' and emerges from said layer at the point it which is beneath, at, or adjacent the infolded edge of said superimposed layer. The bobbin thread is then passed through the loop of needle thread and upon the setting of the stitch the concatenated loops of needle and bobbin thread are drawn into the superimposed layer. The work is thenfed forward and another stitch taken in the base layer in the manner aforesaid as is desig nated by the same characters in Fig. 9 of the drawing.

It is to be understood that while the seam above described is the preferred seam adapted to be formed by the mechanism herein disclosed other forms of seams may be made by presenting the work in other relations than that heretofore described.

It will also be understood that the work presenting mechanism disclosed herein may be employed in connection with other forms of stitch forming mechanism and that various modifications may be made within the spirit and scope of the following claims.

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

1. In a blind stitch sewing machine for felling a superposed layer upon a base layer of material, comprising, a work support, a curved oscillating needle and complementary stitch forming mechanism located above said work support, means for presenting the work to the needle at each penetrating oscillation thereof to cause the needle to enter and emerge from the upper surface of the base ing a'superimposed layer upon a base layer ofma'terial, comprising a work support, a curved oscillating needle'and complementary stitch forming mechanism located above said work support, means for presenting the work to the needle. at each penetrating oscillation thereof to cause the needle to enter and emerge from the upper surface of the base layer without passing entirely through said layer, means for directing the needle in certain predetermined oscillations to cause it to enter the base layer only and in alternating stitches to cause it upon emerging from the bas'e'layer to enter the under sur face of the superimposed layer beneath and beyond the edge and to emerge from said layer at or under said "edge.

3. In a blind stitch sewing machine comprising a work support, a curved needle oscillating in a plane inclined to the work supporting surface of said work support, and complementary stitch forming mechanism located above the work support, work presenting mechanism includingfeeding mecha- V nism and a bender, and means for causing the bender to rise at every oscillation of the needle whereby the'base layer 'of fabric will be engaged upon each penetration of the needle. v

4. In a blind stitch sewing machine for felling a superimposed layer upon a base layer of material comprising a work support, a curved oscillating needle and complementary stitch forming mechanism located above the work support, work presenting mechanism including feeding mechanism, a benderand means for causing the bender to rise at every oscillation of the needle to present the base layer in the path of the needle and means for vibrating the needle laterally to cause it in one set of stitches to penetrate the base layer only and in altcrnating stitches first to penetrate the base layer and upon emergence therefrom to enter the superimposed layer beneath and be: yond the edge thereof and to emerge from said layer at or beneath its edge.

v 5. In a blind stitch sewing machine for felling a superimposed layer upon a base layer of material comprising a work sup port, a curved oscillating needle and complementary stitch forming mechanism located above the work support, work presents ing mechanism, a bender, and means for cillating in planes causing the bender to rise at every oscillation of the needle to present the base layer in the path of the needle, means for causing the needle to oscillate in planes parallel to and adjacent opposite sides ofthe edge of the superimposed layer whereby certain of the stitches will be laid in the base layer and alternate stitches in both the base and superimposed layers.

6.- In a blind stitch sewing machine comprising a work support, a needle and complementary stitch forming mechanism located and operating above the work support; work presenting mechanism including feeding mechanism, a bender and a plurality of variably operable mechanisms for actuating said bender whereby the bender will; be caused to dwell during the laying of the stitch and during the feeding of the work and will be rapidly raised and lowered be tween said respective dwells.

7. In a blind. stitch sewing machine com prising a work support, a needle and coInplementary stitch forming mechanism located and operating above the work support; work presenting mechanism including a bender, a bender shaft, a cam operable thereby, and differentially operable means actuated by said cam to raise and lower said bender.

8. In a blind stitch sewing machine com prising a work support, a curved needle osinclined to the work supporting surface of the work support and complementary stitch forming mechanism located above the work support; work presenting mechanism including a feeding mechanism, a bender, a divided bender shaft, means for actuating one part of the same, means for transmitting a differential movement to the other part of said shaft, a cam actuated by the flatter and Edifl'erentially operable means actuated by said cam to raise and lower the bender.

9. In a blind stitch sewing machine. comprising a work support, a needle and complementary stitch forming mechanism located above the work support; work presenting mechanism including feeding mechanism, "a

bender, a pivoted bender supporting member, an actuating lever, means connecting said actuating lever to said bender supporting member for transmitting a difierential movement to the latter and means for actuating said lever.

10. In a. blind stitch sewing machine comprising a work support, a curved needle oscillating in planes inclined to the work supporting surface of the work support and complementary stitch forming mechanism located above the work support; work presenting mechanism including feeding mechanism, a bender, a bender supporting lever, an actuating lever therefor pivot-ally con nected to said bender supporting lever and dog.

having a differential movement in respect thereto, a cam having a dwell for actuating said bender lever and means for transmitting a differential rotation to said cam.

11. In a blind stitch sewing machine comprising a work support, a needle and complementary stitch forming mechanism lo cated and operating above the work support; work presenting mechanism including feeding mechanism, a bender, a bender supporting lever pivo'tally and slidably mounted upon a stationary fulcrum, an actuating lever of different length from said .bender supporting lever, means pivotally connectingsaid levers and means. fOr oscillating said actuating lever. I

12. In a blind stitch sewing machine comprising a work support, a curved needle osporting surface of the work support and complementary stitch forming mechanism located above the worksupport; work presenting mechanism including feeding mecha nism, a bender, a'bender supporting lever slidably mounted upon a stationary fulcrum, an actuator lever of different length from said bender supporting lever, means pivotally connecting saidlevers intermediate their ends, a block upon said bender supporting lever and means yieldably connecting said yoke to said block.

14. In a blind stitch sewing machine comprising aiwork support, a curved needle oscillating in planes inclined to the work supporting surface of the work support and complementary stitch forming mechanism located above the work support; work presenting mechanism including a bender and means for actuating the same, a movable work sup-port, a feed dog and a plurality of simultaneously operable instrumentalities connected to said feed dog and said work support respectively, each adapted to cause relative movement therebetween and means for actuating said 7 instrumentalities and means for advancing and retracting said 15. In a blind stitch sewing machine comprising a work support, a, curved needle oscillating in planes inclined to the work supporting surface of the work support and complementary stitch forming Vmechanism located above the work support; work presenting mechanism including a bender and means'for actuating the same, a movable Work support, a feed dog and instrumentalities connected to said feed dog and said Work'support respectively, each adapted to cause relative movement therebetween, means for actuating said instrui'nentalities and means for advancing and retracting said dog.

16. In a blind stitch sewing machine comprising a Work support, a curved needle oscillating in planes inclined to the work supporting surface of the work support and complementary stitch forming mechanism located above the Work support; work presenting mechanism including a bender and means for actuating the same, a yielding work support, a feed dog, combined toggle and bell crank mechanisms connected to said work support and feed dog, operable simultaneously to impart relative movement to said work support and feed dog and means for advancing and retracting said dog.

17. In a'blind stitch sewing machine comprising a work support, a curved needle oscil-l'ating in planes inclined to the work supporting surface of the work support and complementary stitch forming mechanism located above the work support; work presenting mechanism including a bender and means for actuating the same, a feeding mechanism comprising a yieldlable work sup- 7 port and bell crank levers connected respectively to said work support and said feed dog, means for actuating simultaneously said bell crank levers to cause relative movement between said dog and said work support and means for advancing and retracting said dog.

18, In 'a blind stitch sewing machine comprising a work support, a curved needle oscillating in planes inclined to the work supporting surface of the work support and complementary stitch forming mechanism located above the work support; work presenting mechanism including a bender and feeding mechanism comprising a yieldable work support and feed dog, a relatively movable'meniber, a bell crank pivotally mounted upon said relatively movable member and connected at one end to said feed dog, a bell crank pivotally mounted upon the other end of said bell crank lever and connected to said work support, means connected to the other end of said bell crank lever for actuating the latter and means for advancing and retracting said dog. I

19. In a blind stitch sewing machinecomprising a work support, a curved needle oscillating in planes inclined'to the work supporting surface of the work support, and complementary stitch forming mechanism located above the work support; work presenting mechanism including feeding mech-' anism, a bender, an adjustable bender supporting hanger, a bender lever" slidably mounted upona fulcrum upon said hanger, an actuating lever having a stationary fulcrum pivotally connected to said bender supporting lever intermediate of its ends, means pivotally connecting the bender supporting lever to the bender and means for oscillating said actuating lever. V

20. In a blind stitch sewing machine'comprising a Work support, a curved needle oscillating in planes inclined to the 'work'supporting surface of the work support, and complementary stitch forming mechanism located above the Work support; a bender supporting hanger, a cam for supporting the same in adjustable positions, a bender supporting lever pivotally and slidably mounted upon a fulcrum on said hanger, an actuating lover of different length from said bender supporting lever pivotally connected to said bender supporting lever intermediate of its ends, and means for oscillating said actuating lever. r

In testimony whereof, I have signed my name to this specification.

THoMAs J; Harris.

Witnesses:

Gnoncn A. GREENLAW, MABEL A. GPEENLAW.

'Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

Washington, D. (1. s

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