US709308A - Sewing-machine attachment for overedge or blind stitching. - Google Patents

Description

No. 709.308. Patented Sent IG IBOZ.

E. DONALDSON. SEWING MACHINE ATTACHMENT FDR UVEREDGE 0R BLIND STlTCl-IING.

(Application filed Dec. 26, 1901.) 7 (No Model.) 2 SheetsSh\oet I,

asa nu: NORRIS Pirrzns (10.. FHOTO-LITHQ, WASHINGTON. o. c.

Patented Sept. l6} 191112 E. DON ALDSON SEWING MACHINEATTACHMENT FDR DVEBEDGE 0R BLIND STITCHING.

(Application fll ed Dec. 26', 1901.)

(No Model.)

2 sheets-sheet 2,

THE N'onm s PETERS w. P):IOTO-L|YMO., WASHINGYON. o. c.

NITED STATES EDWIN DONALDSON, OF BROOKLYN, NEW YORK, ASSIGNOR TO INTERNA- TIONAL BLIND STITCH COMPANY, OF NEW YORK, N. Y., A CORPORA- 'FION OF. NEW YORK.

SEWING-MACHINE ATTACHMENT FOR OVEREDGE R BLIND STITCHING.

SPECIFICATION forming part of Letters Patent No. 709,308, dated September 16, 1902.

Application filed December 26, 1901. Serial No. 87,335. (No model.)

T0 at whom it may concern: pusher-bar the requisite motion is communi- Be it known that I, EDWIN DONALDSON, a cated from the needle-bar by a train of intercitizen of the United States, and a resident mediate mechanism. Forinstance, as shown of the city of New York, borough of Brookin Figs. 1 and 2 of the drawings, a vertical 5 lyn, in the State of New York, have invented slide-bar F is reciprocated within suitable certain new and useful Improvements in guideways contained in a vertical standard Sewing-Machine Attachments for Overedge F, being a part of the attachment. The said or Blind Stitching and Cooperating Parts of slide-bar is caused to move upwardly verti- Sewing-Machines, of which the following is a cally by the engagement of its downward ex- ;0 specification, reference being had to the actension F with the set-screw A*,- which companying drawings, in whichsecures the needle A to the needle-bar A, Figure 1 is a top view of my improved atand downwardly by the action of a spring tachment, showing its combination with the F A pawl F is pivoted to the said slidework or sewing plate and base and also with bar and engages at each upward movement 15 the feeder of the machine. Fig. 2 is a side of the latter with one of the six equidistant view of Fig. 1, showing the bed of the maspokes of a trundle-Wheel E, on the end of chine in section. Fig. 3 is a detail elevation which is mounted a three-sided cam E, which of the pusher-bar and its actuating-cam. turns with the trundle-wheel and in such re- Fig. 4 is a detail, partly in section, showing lation thereto that by intermittently turning 20 my eccentric adjusting and fastening pin in the trundle-wheel one-sixth of a rotation the perspective. Fig. 5 is a transverse or side angles and sides of the cam are alternately View ofFigJlto illustrate the same parts. Fig. and successively brought to bear on the for- 6 is a top view of a portion of the attachment, ward extension D and on the spring D seincluding. myadjusting device, and of clampcured to the rearward extension D of the z 5 ing-screw B in section. Fig. 7 is a top view pusher-barD, having a bifurcated head (see of the work or sewing plate and of a portion Fig. 3) which reciprocates horizontally in 7 of the base of the machine. Fig. 8 is an elesuitable guideways within the attachment vation, onan enlarged scale, of my eccentric and is thus intermittently projected so that adjusting'and securing pin. Fig. 9 is a top its bifurcations straddle the needle and 0 view of Fig. 8. Fig. 10 is a perspective view, against the edges of the fabrics, so as to push on a greatly-enlarged scale, of my improved them from under the needle at each alternate 8o feeder. Fig.11 is an elevation, on a greatly; descent of the needle-bar. enlarged scale, of my improved presser-foot. It is of great importance that the attach- Fig. 12 is a top view of Fig. 11. ment, and particularly its pusher-bar, shall 3 5 My present inventions relate to improvebe capable of delicate adjustment relatively ments in sewing-machine attachments for to the needle and to the edge of the goods 8 5 overedge or blind. stitching, such as are deand also of being firmly and positively sescribed, for instance, in United States Letcured in the desired position after such adters Patent No. 678,908, granted to me and justment has been accomplished. In the op- 40 to Thomas H. Ross, assignors to the Ross eration of sewing, particularly in the case of 1 Attachment & Machine Company, on July heavy goods, very considerable transverse 9o 23, 1901, and in which the overedge or blind strain is brought to bear against the inclined stitching is accomplished by pushing the work-face of the attachment C as. the goods edge of the fabric away from under the are manipulated and fed forward, and it is 45 needle at each alternate descent of the latter, therefore particularly desirable that the atthe said movement of the fabric being thus tachment shall be provided with hearings or accomplished. intermittently by means of a connections relatively to the work-plate and pusher-bar which engages with and moves base of the machine at at least two points, the said edge intermittently and to which which shall not both be situated on the same line extending either transversely to or parallel with the direction of the feed of the goods. I accomplish apreliminary and general adjustment and securement of the attachment relatively to the needle and to the edge of the goods by the means shown in the said previous patent, consisting of an extension B of the base of the attachment B, containing a longitudinal recess B within which slides a guide-block B A clamping-screw 15 passes through the said guide-block and screwing into the base A of the machine clamps the attachment thereto. A screwt-hreaded rod B extends from the guide-block B and is threaded into the thumb-nut B the latter being provided with a collar B which turns in a recess B By these means, the clamping-screw B being loosened, the rotation of the thumb-nut B will move the attachment toward and away from the needle A in a direction transverse to the direction of the feed, and when the requisite proximity to the needle or to the edge of the goods has been obtained the attachment can be clamped firmly into place by tightening the screw B The leverage exerted by the fabrics and the manipulation thereof during sewing is, however, sufficient in many instances to change the desired angle of the work-face O relatively to the goods and also the position of the bifurcated pusher-bar, so as to cause it to be projected at an undesirable angle in relation to the needle and the presserfoot. To obviate these difficulties, I have provided the attachment with my novel adjusting and fastening pin K, Fig. 8, having a cylindrical lower member or projection K and an enlarged cylindrical portion or shoulder K disposed eccentrically in relation thereto and. provided,preferably, with an adjusting handle K all rigidly secured together. I provide the work or sewing plate A with an elliptical orlongitudinally-extending aperture K Fig. 7, in which fits loosely, so far as movement transverse to the direction of the feed is concerned and closely so far as movement parallel with the line of feed is concerned, the lower member K of the adjusting-pin. The cylindrical and eccentric enlargement K of the pin passes through and rotates within a closely-fitting perforation K in the base 13 of the attachment, the handle K projecting, as shown in Fig. 4, above the upper surface of the base. A set-screw K is provided, passing through a perforation in the base and engaging with the shank of the pin, as shown in Fig. 5. The operation of the adjusting and securing pin K is as follows, the above-described parts having been assembled as stated: After the requisite adjustment of the attachment toward the nee- "dle and the edge of the goods has been accomplished, as before described, by means of the thumb-screw B and its correlated parts the attachment may be adjusted with great delicacy and also with great ease transversely to the direction of the feed and so as to bring the bifurcations of the pusher-bar into eX- actly the required relation to the needle by turning the pin K by means of the handle K which will, as is obvious, move the attachment relatively to the cent-er of rotation afforded by the clamping-screw B When the desired adjustment has been secured, the atlachmeut can be fixed in position positively and with great firmness by screwing up the set-screw K and tightening the clampingscrew B and it will be observed that the combination, location, and operation of the adjusting and securing devices described are such that they can be readily manipulated and operated by the fingers of one hand of the operator without relaxing the hold of the other hand upon the fabric as it is being manipulated and fed forward for the stitching and that by the two bearings thus provided positive resistance will be afforded to movements of the attachment, and particularly of the bifurcations of the pusher-bar carried thereby relatively to the needle either transversely or parallel to the direction of the feed.

The feeder P of the machine operates in the usual way to-move the goods forward. I have found that in the case of certain classes of fabrics-for instance, rough and heavy fabricsa feeder having the usual roughened surface throughout its whole extent interferes with the successful manipulation of the edge of the fabric at and near the needle A (see Fig. 1,) the forward thrust of the pusherbar in moving the edges of the fabric out of the way of the needle tending to unduly crowd them between the roughened surfaces of the feeder and the under side of the presser-foot in the immediate vicinity of the needle,whereby, owing to the roughened character of the feeder opposite the needle, is prevented the desired extent of return of the edge of the goods under and beyond the needle on the withdrawal of the pusher bar. I obviate these difficulties by cutting away the roughened portions of the surface of the feeder through part of itswidth directly opposite the needle and the pusher-bar and preferably also to some extent in advance of the needle and also behind it. The portion of the surface of the feeder thus smoothed is preferably tapered away from directly opposite the needle in both directions and also preferably depressed somewhat below the bottom of the depression in the surface of the feeder, as shown at P, Figs. 1 and 10, the feederbeing thus provided with a depressed portion or recess P, having the general shape described as above. By this means the desired uniform forward feed and return to normal position of the edges of the fabric is secured, notwithstanding the intermittent displacement thereof caused by the pusher-bar, and the natural resilience of the edges of the fabric toward the needle after the withdrawal of the pusher-bar is relieved of impediment. It will be observed that this recess is preferably deeper at both ends thereof, its greatest transverse dimensions, vertical and horizontal, being located opposite the needle. By thus shaping the recess the required control of and movement of the fabrics is more perfectly secured.

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

1. A sewing-machine attachment having a base, a clamping-screw adapted to secure said base to the bed of the machine, a vertical circular perforation in said base, a cylindrical pin having an upper portion of enlarged horizontal cross-section eocentrically disposed and fitting and rotatable in said perforation and a lower portion centrally disposed and fitting and rotatable in a perforation in the work-plate of the machine, means for lockin g said pin in the desired position, and a pusherbar reciprocating to move the edge of the fabrics from under the needle at each alternate descent thereof.

2. A sewing-machine attachment having a base, a clamping-screw adapted to secure said base to the bed of the machine, a vertical circular perforation in said base, a cylindrical pin having an upper portion of enlarged horizontal cross-section eccentrically disposed and fitting and rotatable in said perforation and a lower portion centrally disposed and fitting and rotatable in an elongated perforation in the work-plate of-the machine,'means for locking said pin in the desired position,

and from under the needle at each alternate descent thereof, under said presser-foot, a roughened feeder provided with a recess having a smooth surface opposite, and in proximity, to the end of said pusher-bar, and means for actuating said needle, pusher-bar, and feeder, substantially as and for the purposes described.

4. In a sewing-machine a presser-foot, on one side of the needle, a pusher-bar reciprocated from the opposite side of the needle to move the edge of the fabrics under said presser-foot and from under the needle at each alternate descent thereof, under said presserfoot, a roughened feeder having an unroughened recess tapered at each end, and having its greatest transverse horizontal and vertical dimensions opposite and in proximity to the end of said pusher-bar, and means for actuating said needle pusher-bar and feeder, substantially as and for the purposes described.

EDWIN DONALDSON.

Witnesses:

PHILIP O. PEoK, G. G.1\/IEASURES.

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