US731695A - Blindstitch sewing-machine. - Google Patents

Description

No. 731,695. PATENTBD JUNE 23. 1903. J. G. LEWIS.

BLINDSTITGH SEWING MACHINE.

APPLIUATTON FILED 0012.18. 1891. fNo 'MoDm'.. a sums-SHEET 2l.

co J4/wanton we' mams trims oo, FNQmLITHo.. wnsnmmom n. c

J. G. LEWIS;-

Y BLINDSTITGH SEWING MACHINE. APPLIoATIoN FILED ooT.1a, 1,897.

EATENTED JUNE 23, 1903.

s SHEETS-SHEET a.

1\r0.'731,e95.fV

wUNITED STATES Patented June 23, 1903.

v PATENT OFFICE.

".IoiIN G. LEWIS, oF sT. IloU'Is, MISSOURI.

BLIND-STITCH SEWING-MACHINE.

SPEQIFICATION forming part of Letters Patent No. 731,695, dated June 23, 1903,

Applicationiiled October 18J 189,75 Serial No. 655.519. (No model.) i

i vented a certain new and useful Sewing-Machine, of which the following is such a full,

clear, and exact descriptionas will enable any one skilled in the art to which it `appertains to make and use the same, reference being had to the accompanying drawings, forming part of this speciiication.

for blindstitching cloth-t'. c., for doing work in which the stitches show only on one side of the cloth.

Machines have been constructedheretofore` for making blindstitches on thick materialssuch as leather, straw braid, and the like; but, as far as I am aware, no machine has been made heretofore which would dolsatisfactory blindstitching on cloth, and larly on thin cloth.

The object of my invention is to provide a blindstitching-machine which will work properly on any kind of cloth on which blind-` particu stitching can be done by hand and whichI shall be simple of construction and not liable to get out of orden My invention'consists in the combination, with a suitablestitch-formingmechanism, of

a normally stationaryback guide-t1 e., a

guide on the back or opposite side of the' cloth from that which the needle entersand means of holding the work up to said guide and in various other novel features and de-Y tails of construction, all of which are described in the following specification and needle. Fig. 5 is a top plan view of the back- ;guide and presser-foot and the parts carrying Fig.6isaview similarto Fig. 5, but

thesame. showing the presser-footn a different position. Fi g..7 is a side elevation of the parts in Fig. 5. Fig. 8 is asection showing the manner in which the work is held. Fig. 9 is anend viewshowing the feed-dog and back guide. Fig. 10 is a bottom plan view showing `the partsactuating the feed-dog. Fig. 1l is an isometric projection of the feed-dog, and Figs. 12 and 13 are views showing two kinds of work which can be done on the machine'.

Like marks of reference refer to similar parts in the 'several views of the drawings.

15 is the arm of the machine, which is of the Y Ausual construction and is providedwith the `My invention relates to a sewingfmachine, and moreparticularlyito a sewing-machine usual mechanism-forireciprocating the needle-bar 16 longitudinally. The needle-bar 16 is carried by the sleeve 17, `as is usualin machines in which the needle reciprocates both longitudinally and laterally. Pivoted to the sleeve 17 is one end of an extensible connect- 'ing-bar 18, the other end of which is screwed to an oscillating arm 19, as shown on Fig. A3, by a thumb-screw 20, which passes through ,the bar into a block 2l, sliding'iu the arm 19. The extension of the bar 18 is obtained by two screws 22, which pass through a plate 23 and the end part 211 of the bai-into the main part 18. The arm 19 is pivoted to the machine-arm 15 at the point 25 and is actuated by suitable cam mechanism in the machinearm.

The-.parts above described are old, and I do not claim the same. My improvement in this part of the machine consists in the following devices for obtaining accurate adjustment of the parts: On the bar 24 is a lug 27, through which passes a rod 28, on which at each side of the lug is a collar 29. The end of the rod 28 is threaded and enters a lug 30 on the bar 18, which is provided with corresponding'internal threads. The rod 28 is provided with a milled head 31, by means of which it can be rotated. Rotatably secured to the block 21 is a threaded rod 32, which-passes-through a threaded block 33, pivoted'in the topi of the arm 19. The block 33 is pivoted to ,allow the slight inclination of the rod `32 when the block 33 moves in the arm 19, which is in the form of an arc of a circle. The rod 32 is provided with a milled head 35, by means of which it may be rotated.

IOO

To obtain the adjustment in the length of I the connecting-bar, the screws 22 are loosened and the rod 28 rotated by means of the milled head 31. When the desired adjustment is obtained, the screws 22 are tightened to lirmly bind the bars 18 and 24 together. To adjust the point at which the connecting-bar is attached to the arm 19, the thumb-screw 20 is loosened and the rod 32 rotated by means of the milled head 35. When the desired adjustment is obtained, the thumb-screw 20 is tightened to secure the parts firrnlyin place.

5y means of the above-described devices the required adjustments can he obtained with absolute accu racy,whicl1 cannot be done when the parts are simply loosened and slid in position by hand, as has been done heretofore.

Secured to the work-plate of the machine is an L-shaped plate 38, to which is pivoted a plate 39. Carried by the plate 39 is a hollow block 40, in which the feed-dog 4l operates. A portion 42 of the plate 39 is bent downwardly and carries a back guide 43. The guide 43 is cylindrical in form and slightly tapering, so as to form a stretching device for the work. The feed-dog 4l is carried by the arm 44. In the arm 44 is a slot 45, Fig. 5, which slides on a block 46, pivoted to the plate 39 by a screw 47, so as to admit of the sliding and swinging motion necessary to communicate the fourway motion to the feed-dog. The arm 44 is connected, by means of a universal joint 48, to an upright rod 49, to which a four-way motion is communicated by mechanism to be hereinafter described. Thecenterofthejoint48is on an angle offortyfive degrees with the center of the pivot connecting the plate 38 and 39-that is, horizontal and vertical planes drawn through the center of said pivot would be equally distant from the said joint 48. This is to allow the plate 39 and arm 44 to remain parallel when the said plate is swung upward. In the plate 38 is an opening 50, through which the rod 49 passes.

Sliding in lugs or brackets 52 and 53 is a presser-foot bar 54. On` the har 54 is a collar 55, and interposed between said collar and the lug 53 is a coil-spring 56. Pivoted in the end of the bar 54 is a cam 57, provided with an arm 58. The cam 57 operates on the face of the lug 53 to move the bar 54 longitudinally. A portion 60 of the presser-foot projects slightly beyond the face of the rest of the foot and is provided with a concave face 6l, Fig. 7, correspondingr to the forni of the guide 43. y

In the part G() is an opening 62, through which the needle passes. Carried by the part GO is a folding attachment 63, which turns the edge of the material 64 under, as shown in Fig. 8, asv it passes between the guide 43 and the face of the part 60. The portion 65 of the presser-foot which opposes the feeddog 4l is pivoted at 66 to allow it to yield independently of the rest of the presser-foot and is held up to its` work by a spring G7.

68 is the slot in the throatplate (39= through which the needle passes. 7l is the case of the shuttle mechanism, which maybe of any of the usual forms. 72 is the shaft driving the shuttle mechanism. On the shaft 72 is a cam-wheel 73,Which actuates an arm 74,whi'ch is pivoted at 75. The arm 74 actuates a rod 76, sliding in .guides 77. The end of the rod 76 is bifurcated and has pivoted between its arms a block 78. (Shown in dotted lines in Fig. l0.) 79 is a bar, the end of which is bifurcated and embraces the block 78. The other end of the bar 79 is attached by a universal joint 8O to an arm 8l, carried by a rock-shaft 82. The rock-shaft 82 is actuated by the usual mechanism. The rod 49 is attached to the bar 79 at the point 83.

The needle 85 is formed, as shown in Fig. 4, so that the side of the needle next the back guide is substantially a straight linethat is, the point of the needle instead of being in a line with the center of the needle is on a line or nearly on a line with the side of the needle.

The operation of my machine is as follows: To insert the work, the presser-foot is withdrawn from the back guide by means of the cam 57 and the plate 39 swung upward on its pivot. The material to be operated on is then placedaround the back guide, the portion forming the hem being under the guide, and the edge is turned in at about the center of the face of the guide, as shown in Fig. 8. The plate 39 is now lowered and the presser-foot released. As the work is fed through the machine the folder 63 turns in the edge. The needle passes down through the opening 62 alternately in the paths indicated by the dotted lines in Fig. 8. This gives the form of stitch shown in Fig. 12. On account of the tapering form of the back guide the material is stretched tightly around the same while it is being operated on by the needle, and hence the work is uniform and accurate. As the back guide is stationary during operation, work can be done on Very thin cloth and the machine can be run at a high rate of speed, neither of which results can be accomplished by machines having the reciprocating or rotating guides heretofore used. The operation of the machine is also made more perfect by the form of the needle used. The point of the needle must pass through the center of the layer of goods next the guide, and if the ordinary form of needle with the point on the center line were used the goods would be wedged between the guide and the rounded portion of the needle, with the result that thin goods would be cut through, so that the stitch would show. By placing the feed-dogentirelybehindtheguide, Where the stitching is done, it comes in contact with the goods after the layers are firmly joined together, and hence the danger of causing one layer to slip on the other and cause unevenness in the work is avoided. By placing the feed-dog on the lsame side of the goods as the back guide it does not come in contact with the stitches, which otherwise might be injured by its action.

, twice through theouter layer. This will give the form of stitch shown in Fig. 13. i

I-Iaving fully described my invention, what I'claim as new, and desire to secure by Letters Patent of the IUnited States, ise 1. In a sewing-machine for blindstitching, suitable stitch forming mechanism, a normally stationary back guide for the Work,

said guide having its face rounded transversely to the direction ofthe feed, and means for feeding the material along said guide.

vsuitable `stitch-forming mechanism, a back guide for the Work having a rounded tapering face,a means `for holding the work in position around said back guide.

4. `In a sewing-machine for blindstitching,

i suitable stitch-forming mechanism, a nor- `mally stationary back" guide for the work having a rounded/tapering face, and means for holding the work in position around saidv back guide.

\ 5. In a sewing-machine for blindstitching, suitable stitch-forming mechanism, aback e guide, and a foldingdevice for folding in the suitable stitch-forming mechanism, a back4 edge of the work as it passes to thesaid back guide.

6. In a sewing-machine for blindstitching,

guide, a presser-foot for Vholding the work in position around said back guide, and a folding device carried by said presser-foot for folding in the edge of the work as it passes to the said back guide.

7. In a sewing-machine for blindsti'tching, suitable stitch-forming mechanism, a back guide, means forholding the Work in position around` said back guide tangentiallyto the needle, and a feed-dog operating behind said back guide, whereby the Work is only acted upon bythe feed-dog after the layers are secured together by the stitching mechanism.

8. In a sewing-machine for blindstitching,

i stitch-forming mechanism, a back guide,

means for holding the work in place against said back guide, and a feed-dog operating behind said back-guide and at the same side of the goodsso that said feed-dog will not come in contact with the stitches, said feed-dog being arranged to feed the goods along said back guide.

9. In asewing-machine for blindstitching,

suitable stitch-forming mechanism, a back guide, a feed-dog, a spring-actuated member holding the work in place around the said back guide, and a member holding the Work up to said feed-dog, said latter-named member being capable of yielding independently of said member holding the work against the back guide.

10. InaseWing-machineforblindstitching,

stitch-forming mechanism, a back guide, a

feed-dog, and a presser-foot holding the Work in position against said back guide and feeddog, thepart of said presser-foot opposing said feed-dog being arranged to yield independently of the rest of the presser-foot.

l1. In aseWing-machine for blindstitching, a suitable back guide, means for holding the Work against said back guide,and stitch-forming mechanism, said stitch-forming mechanism being provided with a needle whose point is substantially in a line with the side of the needle nearest the guide.

12. In a sewing-machine for blindstitching, y

a suitable back guide, means for holding the work against said back guide,and stitch-forming mechanism, said stitch-forming mechanism being provided with a needle whose point is between its center line and the back guide. 413. In asewing-machine for blindstitching, a guide, and astitch-forming mechanism provided with a reciprocating needle the point of which in its travel past said guide is as near thereto as its side. 14C. In a sewing-machine for blindstitching, a guide, and a stitch-forming mechanism provided with a reciprocating needle the point of which in its travel past said guide is nearer thereto than its center line.

15. In a sewing-machine for blindstitching, a back guide, and a stitch-forming mechanism provided with a reciprocating needle the point of which in its travel past said guide isas near thereto as its side. 16. In a sewing-machine for blindstitching, a back guide, and a stitch-forming mechanism provided with a reciprocating needle the point of which in its travel past said guide is nearer thereto than its center line.

' 17. In a sewin g-machine for blindstitchin g, a back guide having a rounded tapering face, means for holding the work in position against said back guide, and stitch-forming mechanism, said stitch forming mechanism being lprovided with a needle whose point is be- IOO IIO

means for holding the Work around said back guide, and suitable stitch-forming mechanism.

20. In a sewing-machine for blindstitching, a normally stationary back guide, a pivotallymounted member carrying said back guide, a feed dog also carried by said pivotallymounted member, means forholding the Work in position against said back guideand feeddog, and suitable stitch-forming mechanism.

21. In a sewing-machine for blindstitching, stitch-forming mechanism, a back guide having a rounded face, a presser-foot having al corresponding concave face, and an opening in said presser-foot through which the needle of said stitch-forming mechanism passes adjacent to said back guide.

22. In a sewing-machine for blindstitching, stitch-forming mechanism, a back guide having a rounded tapering face, a presser-foot foot, and means for imparting a four-Way motion to the other end of the arm.

In testimony whereof I have hereunto set my hand and aixed my seal in the presence 35 of the two subscribing Witnesses.

, JOHN G. LEWIS. [L. s] Witnesses:

JOHN F. GREEN, A. C. FOWLER. y

Images