US737013A - Two-needle hemstitch sewing-machine. - Google Patents

Description

No. 737,013. PATENTED AUG. 25, 1903.

A. J. A OEETEEEEIEE. .TWO NEEDLE HEMSTITGH SEWING MACHINE.

' 'APPLIOATION FILED MAR. 29. 1902.

NO MODEL.

UNITED STATES Patented August 25, 1903.

PATENT OFFICE. I

AMANDUS JOI-IANN AUGUST OESTERREICH, OF HAMBURG, GERMANY,

ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, OF ELIZA- BETH, NEW JERSEY.

TWO-NEEDLE HEMSTITCH SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 737,013, dated August 25, 1903.

I Application filed March 29, 1902. Serial No. 100.50l. (N0 model.)

To all whom it may concern.-

Be it known that I,- AMANDUS J OHANN AU- GUST OESTERREICH, a subject of the German tirely and to arrange the two sewing-needles in such a manner that they are enabled to form the hole in the fabric as well as to stitch the longitudinal edges of the hem. I attain this object by mounting the two needles in such a manner that they may be brought together at times at an acute angle with the point of one needle against the side and above the point of the other needle, so as to form a wedge previous to entering the work in order to form the hole for the hemstitch. Thus the two needles not only serve for stitching along the two longitudinal edgesof a hemstitch-seam, but also perform the work. of the special piercer or plunger usually employed to divide the threads of the fabric or to form holes for the open-work hemstitched seam.

In the accompanying drawings, in which similar letters refer to similar parts thoughout the several views, Figures 1, 2, and 3 represent a needle-bar of a hemstitch sewingmachine carrying two needles mounted in pivoted carriers properly designed for permitting lateral oscillations of the needles, while Figs. 4 and 5 show'the needles separate from the needle-clamps and on an enlarged scale.

Referring to the drawings, aand b are the two needles, which are connected with the needle-bar c by rocking need le-holding blocks or clamps d, pivotally mounted on lateral extensions at the lower end of the said needle bar. The needle a is longer than the needle I), so that its point is below the point of the said needle I), and said needle a is preferably provided on one side adjacent to its eye a and above its point with a recess to receive the point of the needle I) when the two needles are closed together, as in Fig. 3, to form a piercing or thread-dividing wedge. The needle b will preferably be somewhat sidepointed and the long-thread-receiving groove in the needle a will preferably be extended below the eye a, as denoted by dotted lines in Fig. 5, so that the point of the needle 1) may be received in said groove when the needles are closed together. The pivoted needle-carriers d have preferably a loose pinand-groove connection, as clearly shown in the drawings, and one of said carriers is provided with an arm e, which may be reciprocated or vibrated in any suitable manner to vibrate the two carriers to cause the needles to assume the two posit-ions shown in Figs. 1 and 3.

In the preferred operation of the invention in hemstitching the two needles, closed together, as in Fig. 3, will first descend and form a hole in the fabric, the point of the needle a first forming a small hole which is immediately enlarged or widened by the furthur descent of the wedge action of the two needles. After the needles have risen above the fabric they are separated, as in Fig. 1, and then descend and enter the fabric at the sides of the hole previously formed. At the next descent the two needles are again closed together and in such position enter and further enlarge the hole previously formed and make additional stitches therein, and they again rise, remaining closed together, and then again descend thus closed together after the fabric has been fed for the next stitch to form a new hole in the fabric, and these operations are repeated as the work progresses. In these operations the needle-bar c is reciprocated by any well-known operating mechanism. Thus the holes in the hemstitch work are formed by the needles alone Without requiring a separate thread divider or piercer.

Having thus described my invention, I

claim and desire to secure by Letters Patvibrating said carriers to cause the point of entone needle to be, at times, housed in the said In ahemstitch sewing-machine, theoombigroove of the other needle. nation with two needles one of which-is pro- AMANDUS JOHANN AUGUST OESTERREIGH. 5 vided on one side with a. long-thread-receiv- \Vitnesses:

ing groove extending below its eye, of piv- E. H. L. MUMMENHOFF,

oted carriers for said needles, and means for OTTO W. HELLENRICH.

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