US1735584A - Blindstitch-sewing machine - Google Patents

Description

Nov. 12, 1929. PRESTWICH- 1,735,584

BLINDSTITCH SEWING MACHINE Filed Aug. 9, 1926 5 Sheets-Sheet 1 INVENTOR d ATTORNEY Nov. l2, 1929. F1. PRESTWICHK' 1,735,584

BLINDSTITCH SEWING MACHINE Filed Aug. 9, 1.926 5 Sheets-Sheet 2 INVENTOR ATM ATTORNEY W29. F. M. PRESTWECH BLINDSTITCH SEWING MACHINE Filed Aug. 9. 1926 5 Sheets-Sheet 3 INVENTOR A TTORNE Y Nov. 12, 1929. F. M. PRESTWICH BLINDSTITCH SEWING MACHINE Filed Aug. 9, 1926 5 Sheets-Sheet 4 INVENTOR.

ATTORNEYS.

Nov. 12, 1929.

F. M. PRESTWICH BLINDSTITCH SEWING MACHINE Filed Aug. 9. 1926 5 Sheets-Sheet 5 INVENTOR M L W BY I ATTORNEIY M. PRESTWI, OF NEW YQEK, N. i.

BLIND'S'EITCH-fiING, EAGHINE Application. filed August 9, 1923. Serial No. 128,013.

This invent-ion relates to blind stitch sewing machines, and has for its object to provide a machine which is capable of working upon a wide variety of materials including both fine and thick fabrics, as well as materials of a non-uniform thickness.

. A well known form of blind stitch machine comprises a curved needle movable through the under fabric and then diagonally through the overlying material with a fabric bender located beneath the goods and adapted to raise the goods into co-operation with the needle. An objection to this type of machine is the inability to satisfactorily operate upon materials of non-uniform thickness, such as a coat sleeve lining at the arm hole which has more padding in one part than in an other, also the-top of waisthands of trousers where beltloops and buttons are encountered. With the bender located'heneath the material, set togive a predetermined thrust, a larger protrusion or dome is formed with thick material than with thin, and therefore since the diameter of protrusion with thick material is greater than with thin, the needie has a longer stroke through the goods, the result that it may be too great to form a proper or even stitch it the mamriai is of nonnniiorm thickness.

according to this invention, a picker is provided instead or" the bender-of the prior ar and the picker is located to penetrate the :ZQWQE' .iahric top and move in lrnedreiatien to the needie for penetration thereby preciseiy as the first movement in i and sewing. Since the picker enters the top o he mate ,'in the vicinity of the path of the needie,

snakes i "do or no difference whether ork he thich or thin, or or varying r the bottom face or? the stationary at arms the dete line r the mateto be sewn. yieldahle weri: support is 9 d take care of larger irregnlariti" work and the top surface or he made flexible to udden "inor irreguiarities were: thickness. ieidaioie work support wilt css the worn: evenly against the ont 142i sect: of the feet regardless of varying thickness of work and the top surface of the work will at all times be on a definite line between front and back surface of the foot and in precisely the correct register for the picker needle to strike through the opening in. the foot. The movement of the picker is adjustable for difi'erent conditions, to obtain different lengths and depths of thrust. The machine of this invention has a greater held of usefulness than prior art machines now commercially used as it is adaptable foruse with heavy overcoats or with the hemming at the bottom of a thin satin skirt.

Referring to the drawings:

Fig. l is an elevation partly in section of a blind stitch sewing machine embodying this invent-ion,

Fig. 2 is a left end view of the device of Fig. 1,

Fig. 3 is a section on the line c-c oi? Fig. 1.

Fig. t is a section on the line dzi of Fig. 1.

Fig. 5 is a section on the line e-e of Fig. i.

Fig. 6 is a section on the time f-f of Fig. i.

Fig. '3 illustrates the form of machine in which the picker needle does not move back and forward with the feed dog.

Fig. 8 is a longitudinai section of the work support on line it-h shown in 9 shows another type of work support. a re is stop plan viewot yet another construction for the work support.

5 11 is a longitudinal section of the work sort oi on iine thereof.

' is View corresponding to d,

i owned construction.

a rear the device F 14: is a rear view of the device of with the sewing needie removed.

1s customary in hnnd stitch sewing machines, the power. is supphed to the strait Ill. I

the work. passing beneath the presser foot 18 hun from the depending support 19. A0-

cor mg to common practlce, the presser foot is recessed to permit a feed dog to engage the work, and is also provided with a usual edge guide and projection for raising the edge of the work. Beneath the presser foot is the work support 20 shown in Fig. 1, being pivotally mounted on the rod 21 through the supporting column 22 through which passes the pin 23 for transversel pivoting the frame 24 for the yieldable work support 26, which is rotatable in the bearings 25' of said frame. As shown in Figs. 1 and 5, the yieldable work support 26 comprises resilient prongs 27 and 28 extendingalternately from opposite sides of the rotatable member 26. In this way, irregularities in thickness of the work passing over the top central portion of the resilient work support 26 may be compensated for by bending of the prongs 27 and 28.

Larger irregularities may be taken care of by yielding of the supporting member 29 agamst the action of sprmg 30. Owing to the pivotal mountin of the yieldable work support 26, the ,mem er 26 as a whole may tilt to compensate for the presence of irregularities in thickness of the work transversely of the path of movement of the work through the machine.- Theplate 31 shown in Figs. 1 and r 5 is provided with a large recess through which the ieldablework support 26 co-operates with t e work.

Also mounted on the shaft 10 is the gear 32 engaging another gear 33 on shaft 34 driving 'the bevel gear 35 and its co-operating bevel gear on the shaft 36. As shown in Fig. 3 the bevel gear'35 is blanked throughout a portion of 1ts circumference so a to only intermittently actuate the shaft 36 in timed relation to the movement of the main shaft 10 and needle 15. On the lower end of shaft 36 is another bevel gear'37 actuating the cooperating gear 38 on shaft 39 within the hearing 40 for driving the rotatable member 41 provided with a slot 42 as shown in Figs. 1 and 6. Adjustably mounted within this slot 42 is the pin 43 passing through one end of the connecting bar 44 having the picker needle 45 mounted at ,,its other end. This picker needle isso located and actuated as to'engage the work in timed relation to movement of the needle 15 and move the work to suflicient height to be engaged" by. the needle 15'. Within the connecting bar 44 is the slot 46 having the pivot pin 47 passing therethrough and on which the connecting bar44 is mounted. The

pivot pin 47 is slidable within its supporting bearing in bracket 48 with the backward and forward movement of the feed dog. A wingnut 49 adjustably controls the height of the bracket 48 which is slotted at 50 for this purpose. The feed dog 53 has an extension 52 provided with bifurcated ends 51 engaging a threaded member on the pivot pin 47 for givin this pin and likewise the picker needle 45 a forward and backward movement with the feed dog. Simultaneously member 41 raises and lowers the picker needle in properly timed relation to the movement of the stitching needle 15, so that the picker needle has both u and down movement and backward and orward movement. As shown in Fig. 5 the presser foot is recessed to enable the picker needle 45 to co-operate with the work. Also in Fig. 5 alternate parallel and angular movements of the stitching needle 15 are represented by the dotted lines 54. The feed dog as is customary is actuated by a pair of eccentrics shown in Fig. 1 on shaft 10, one for giving it the forward and'back ward movement, the other the up and down motion. For controlling the angular relationship between gear 33 and shaft34 for accurately timing the picker needle, the shaft 34 is provided with the projection'55 thereon, and secured to the gear 33 are the projections 56. Adjustable threaded members pass through the projections 56 and engage the projection enabling the shaft to be relatively rotated a slightamount with respect to the gear 33, the gear 33 being otherwise free on the shaft and driving the shaft 34 through projections 55 and 56, as shown in Fig. 6.

Fig. 7 illustrates the preferred embodiment of this, invention, in which the picker needle does not have the forward and backward movement with the feed dog; that is, there is no extension on the feed dog as in the receding figure, but the picker needle ere does have its movement laterally in the path of the goods as previously described in.

with the feed dog, but only has the rotary movement referred to.

Figs. 12 to 14 inclusive illustrate other views of the same preferred form of the invention that is shown in Fi 7.

The work support shown in Figs.'-7 and 8 comprises the recessed plate 65, mountedon the supporting colunm 58 which. is yieldable under the action of spring 64 to take care of large irregularities in thickness of the work. The springs 66, mounted on the cross bars, illustrated ass through the recess in plate 65 and 811516 small irregularities in thickness of the work to be taken care of.

Fig. 9 illustrates a type of work su port in which the plate 62 is not recessed and is yieldable only under the action of the spring 63.

Fig. 10shows another form of work sup- .port in which the plate 57 isrecessed and the springs 60 constitute individually yields able support members within the recess to take up irregularities in the thickness of thework, such as belt loops or buttons in sewing trouser waistbands. Also, the tautness of the work throws extra thicknesses into the space between. Each of the springs 60 is of general spiral shape as shown. Larger variations in thickness of the work are compensated for by the spring 59, shown in Fig. 11.

Among the advantages of this invention may be mentioned the ability of the machine to operate on a wide variety of work, whether thin goods or thick material and with equal facility; The picker needle may engage the work at the side or on substantially its upper surface, so as to move either thin or thick material with equal ease. A special advantage of this machine is its adaptability to produce better work through having the stitches uniform when the work varies inthickness, as for example, in the upper attachment of the lining of a coat sleeve where the goods are' not of uniform thickness due to more ,padding being used in some portions of the shoulder than in others. By loosening the nuts on shafts 43 and 47, the bar 44 can be moved backward or forward to vary the eccentricity of shaft or pin 43 with respect to the rotatable disc or wheel 41. This vathe nut on shafts 43 and 47 can be tightened the machine, of a picker for penetrating t as well as the wing nut 49. The bar 44 naturally will have a certain amount of movement with respect to the shaft 47, but the shaft 47 does act as a fulcrum for the bar 44. The different types of yieldable work supports shown enable the goods to bepassed under the presser foot without interfering with the operation of the machine, and the location of the icker needle above the presser foot or feeding means enables the work sup-- sign to suit any particular work.

Provision may be made for using a picker a needle to penetrate the top layer of the lining at eve stitch if desired.

1 claim:

1. lln a blind stitch sewing machine, the combination witha work support and means for feeding two layers of material through superimposed layer and the upper surface of the base layer of the material and moving both to a predetermined position, a curved needle positioned to similarly penetrate the layers and form the stitch when the layers are so moved by the picker and means for driving the feeding means, picker and needle in synchronism.

2. In a blind stitch sewing machine, the combination with a work support, a presser foot spaced therefrom to permit the passage of two layers of material, and feeding means, of a picker for penetrating the superimposed layerand the upper surface of the base layer of the material and moving both to a predetermined position, a curved needle positioned to similarly penetrate the layers and form the stitch when the layers are so moved by the picker, and means for driving the feeding means, picker and needle in synchronism.

3. In a blind stitch sewing machine, the combination with a work support, a presser foot spaced therefrom to permit the passage of two layers of material, and feeding means, of a picker for penetrating the superimposed layers and the upper surface of the base layer of the material and lifting both from the work support to a predetermined posit-ion, a curved needle positioned to similarly penetrate the layers and form the stitch when the layers are so lifted b the picker, and means for driving the feeding means, picker and needle in s'ynchronism.

4. In a blind stitch sewing machine,-the combination with a work support, of means for feeding the work through the machine, a needle, means for actuating the needle alternately parallel and at an angle to the movementjof the work, a picker needle located adjacent the first needle and above the work support, means for actuating the picker needle in timed relation to the first needle for "penetrating and moving the work into the path of the first needle, and means to control the amount of material moved by the picker needle. I

5. In a blind stitch sewing machine, the combination with a work support, means for feeding the work through the machine,' a needle, and means for actuating the needle alternately parallel and at an angle to the movement of the work, of a picker needle located adjacent the first needle and above the work support, and means for actuating the picker needle in timed relation with the first needle for penetratin and moving the work into the path of the rst needle.

6. A blind stitch sewing machine comprising a work support, means for feeding two layers of material through the machine,

1 picker means located above the work support for penerating the superimposed layer and the upper surface of the base layer of the material and lifting both from the work support,'a curved needle positioned to similarly penetrate the layers to form the. stitch when the layers are so lifted by thepicker, a yieldable work engaging member supported in said work support and means for driving the feeding means, picker means and needle in synchronism.

. 7. A blind stitch sewing machine comprising a needle, actuating mechanism therefor,

a work support, means for feeding the work over the work support, picker means operated in timed relation to said needle to penetrate and move the work into the path ofthe' needle, said work support comprising a flexible member for yieldlng under small irregularities in thickness of the work, and a yieldable support for said flexible member whereby larger irregularities in thickness of the work are provided for.

8. A blind stitch sewing machine comprising a needle, actuating mechanism therefor, a work support, means for feeding the work through the support, picker means located above the work and actuated in timed relation to the needle for penetrating and moving the work for engagement by said needle, said work support comprising a flexible member 'for bending under small irregularities in thickness of the work, and a yieldable support for said flexible member whereby larger irregularities in thickness are provided for.-

9. In a blind stitch sewing machine, 'the combination with a work support, bf means for feeding work through the machine, a needle, means for actuating the needle, a picker needle located adjacent to the first needle and above the work support, means for actuating the picker needle 1n timed relation to the first needle for penetrating and moving the work into the path of the first needle and means for adjusting the movement of said picker needle.

10. In a blind stitch sewing machine, the combination with means for feeding the work theretlrrough, of a needle, actuating mechanism therefor, means timed with the needle for penetrating the work above its lower surface and moving the work to intercept the needleand a yieldable work support beneath said needle.

' Signed at New York in the county of New York and State of New York this 2nd day of August, A. D. 1925.

FRANK M. PRESTWICH.

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