US273318A - Otates jratent- v - Google Patents

Description

'(ModeL) 2 Sheets-Sheet 1-.

P. E. SCHMIDT.

BUTTON'HOLE SEWINGMAGHINE. No. 273,318. Patented Mar. 6,1883.

u. pz'renypnuwuin n w. Walhington o. a

(ModeL) 2 Sheets-Sheet 2. .P, E. SCHMIDT,

BUTTON HOLE SEWING MACHINE. 110.273.5318. Patented Mar.6,1'883.

N. PETERS Fimtwlilbogww. Wa hingian, D C- NirE- STATES PATENT Br on.

FRIEDRICH E. SCHMIDT, OF BROOKLYN, NEW YORK.

BUTTON-HOLE SEWING-MACHINE.

. SPECIFICATION forming part of Letters Patent No. 273,318, dated March 6, 1883,

Application filed August 17, 1880. (ModeL) To all whom it may concern:

Be it known that I, FRIEDRICH ERNST SCHMIDT, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Button-Hole Sewing-Machine, of which the following is a specification.

This invention relates to improvements in machinery for stitching the .edges of buttonholes, and'is shown to be applied and applicable to such machines as are described in Letters Patent No. 86,617, but is also applicable to allother button-hole sewing-machines which have a needle-thread and shuttle-thread and a lower gimp or inlay thread which is bound in by the needle-thread.

The object of my present invention is to sew onto the edge of a button-hole a further fourth thread, which is laid in and held fast by the needle-thread, and which serves to improve the appearance of the side of the button-hole opposite to'that to which the shuttle-thread and thegimp-thread are applied. In gentlemens coats and other garments the two sides of the fabric having a button-hole are frequently exposed to view, and there is an objection to the present mode of stitching button-holes that one of the sides only has a perfect finish and the other not, and that one of the sides has proper strong binding, and the other not. By my invention a complete finish of both sides of thebutton-hole is insured, and less danger of destroying the stitch by ordinary wear incurred.

1n the accompanying drawings I have endeavored to illustrate so much only of a sewing-machine of the well-known kind--in this case of the machine known as the Humphrey mach1neas will enable any one skilled in the art to apply and understand my improvement, which really is in the nature of an attachment to a sewing-machine.

Figure 1 in the drawings represents a side elevation of the Humphrey sewing-machine having my improvement. of the same. Figs. 3 and 4: and Figs. 6 to 14, inclusive, are detail views, showing parts of the improvement; and Fig. 5 is a diagram showing the stitch produced by this improvement.

Fig. 2 is a top view.

the lower inlay or gimp thread. One of these cams, E (see Fig. 6,) hasaprojection, b, (shown in Figs. 1 and 6,) for striking at proper intervals a lever, E, which connects with anotherlever, F, (clearly shown .in Fig. 1,) both said levers being pivoted to the frame-work of the machine. The lever F joins, below its pivot 61, with a connecting-rod, G, and above its said pivot with another connecting-rod, H. The rod G connects with a crank, c, that projects from a vertical tubular spindle, I, which is parallel and near to the lower portion of the needle-bar, and the rod H connects with a .crank, f, that projects from a vertical tube, J,

I and J, as indicated in Figs. 3' and 4-, and on a larger scale in Fig. 14.

From the side of the rod L, at or near its lower end, projects through horizontal slots of the tubes I and J a horizontal arm, g, which has a hole in its-end for the thread h (that is to be laid onto the fabric by the needle-thread) to pass through. a From the lower part of the tube I projects a forked book, i, and from the lower part of the tube J projects a similar hook, j, as clearly shown in Figs. 3 and 9. The book j is on a horizontal plane just below that of the book 1'.

When the machine operates, the lever E is vibrated on its pivot, vibrating therefore also the lever F, causing said lever to oscillate the tubes I and J, so as to make the hooks t' andj alternately overlap, as in Fig. 4, and bringing them apart, as in Figs. 3 and 11.

The'diagram, Fig. 7, illustrates the position of the cranks c andfat the time the hooks t'j are in the position shown in Fig. 3, and the diagram, Fig. 8, illustrates the position of said cranks at the time the hooks are in the position shown in Fig. 4.

The thread h, which is to be laid on by the needle-thread a, is taken from a spool, M, and passed through suitable guides, 11 m, thence through the upper extension, is, of the lever F, thence back to the guide m, and thence through a loop, a, at the upper part of the needle-bar, and thence down through the hole in the arm 9. A suitable tension device, N, is preferably introduced between the guides l and m, as shown in Fig. 2. After the needle descends with its thread a the hooks M are spread apart, as in Fig. 8. After the needle has raised the thread a in ascending, the hooks ij are brought together, so as to overlap. The hook t, carrying in its fork the thread h, now pulls it past the upright needle-thread a, as shown in Fig.

4. The iork of the hook j, folding closely un-' der the hook i, bends the thread It beneath t, thus taking 011' the thread It sufficient for the loop which is to be produced by the said thread h. In the position shown in Fig. 4 the thread h, held taut by the hooks e'j, bears against the outer side of the thread a, and bends it inward, so as to crowd it nearer to the rod L, and holds it thus until the needle descends again; but the path of the needle is outside of the line h, as indicated by the point as in Fig. 4, and in this path the needle subsequently descends. Thus the thread a is looped over the taut thread it, and stitches it fast to the fabric, because the part of the thread to which had been pulled up is on the inner side and the part carried down by the needle on the outer die-thread, and thus by the continuous operation of the parts in manner described the threads a h appearon the surface of the fabric, (which is moved by a suitable feed,) substantially as indicated in Fig. 5, in which figure the dark thread a is the needle-thread, and the lighter thread h the upper finishing thread. At the time the hooks 'ij are apart the arm of the lever Fis thrown back, as indicated by full lines in Fig. 1, so as to hold the thread It properly taut; but when the hooks come together, as in Fig. 4, the lever F is swung into the position shown by dotted lines in Fig. 1., so as to give all necessary slack and enable the hooks to draw the thread It in the manner described. Afterward, upon the descent of the needle, the superfluous slack is taken up again by the backward movement of the arm is of the lever F.

Having thus described my invention, what I claim is- 1. In a sewing-machine having a reciprocating needle-bar, the combination of the over lapping-hooks tj and stationary perforated arm 9, with mechanism for vibrating said hooks, substantially as described.

2. The combination of the lever F and rods G H, with the tubes 1 J, hooks t'j, and threadguide 9, substantially as and for the purpose specified.

3. The lever F, having the projecting threadholding part It, in combination with the rods G H, spindles or tubes I J, hooks ij, thread-guide g, and with the reciprocating needle-bar, substantially as described.

4. In a machine for stitching button-holes, the combination of the needle-bar and needle and fixed thread-guide g, with a pair of oscillating hooks, ij, and with means for supplying said books with a separate thread, h, to be laid on by the needle-thread, substantially as specified.

FRIEDRICH ERNST SCHMIDT.

Witnesses:

JAMES TURK, SAML. R. BE'rTs.

Images