US1494887A - Sewing machine - Google Patents

Description

May '20, 1924. 1,494,887

L. BULASKY SEWING MACHINE Filed March 13. 1923 avwewtoz Patented May 20, 1924.

. UNITED STATES PATENT amen.

LOUIS BULASKYfOF BROOKLYN, NEW YORK.

SEWING MACHINE.

Application filed March 13, 1923. Serial No. 624,859.

This invention relates to sewing machines of the general character of that shown in Letters Patent of the United States No. 777 ,074, dated December 13, 1904, which are adapted for the stitching together of straw braids to make hats and for the stitching of wire binding upon the edge of straw, buckram and felt hats, the needle, which reciprocates in a substantially vertical direction, being mounted upon a frame which oscillates upon a horizontal axis so that the needle enters the fabric alternately on 0pposite sides of a median line, forming, in co-operation with the looper which is correspondingly reciprocated, diagonal or zigzag stitches. In the operation of the ma chine shown and described in said Letters Patent it has been found that the output of the machine is somewhat reduced by the time consumed in restoring the gage to position after it has been displaced as is frequently necessary in the operation of the machine and that the operation itself is somewhat slowed down by the necessity of taking pains, on the part of the operator, to prevent the overlapping of two braids which are to be stitched together, as well as by the necessity for the exercise of care, in some classes of work, to prevent the free edge of the material operated upon from curling and riding above the gage. It is the object of the present invention to improve the machine described in said Letters Patent in such manner as to overcome the difficulties referred to and thereby to make possible a greater speed of operation and a greater output. vention there is provided an improved device for preventing the curling of the edge of the work and the rising of the same above the gage. The invention will be more fully explained hereinafter with reference to the accompanying drawings in which Figure 1 is a View in front elevation of a zig-zag stitch sewing machine substantially as shown in Letters Patent No. 777,074, but

In accordance with the inwith the devices which form the subject of.

the present invention applied thereto.

Figure 2 is a partial view of the same on a larger scale. U I V Figure 3 is a view of the parts shown in Figure2 as seen from the left hand in- Fig ure 2. I I I 1 Figure 4 is a detail top view of a gage and retaining finger and its supporting device. g V

As fully described inlsaid Letters Patent,

the base a of the machine carries a frame a and an arm a wlnchsupportthe working parts of the machine, the main shaft 6 hav ing driving pulleys b and an eccentric 6 which, through the pitlnan b lever b and link b imparts to the needle bar 0 reciprocation in a substantially vertical direction. For the purpose of effecting the zigzag or cross stitch the needle bar 0 is mounted for, vertlcal reciprocation 111 a frame (Z which 1s mounted to oscillateabout a horizontal axis and is oscillated by a cam e, driven from the shaft 6, a lever f and a link F, as fully described in said Letters Patent. The presser-foot g, feeder 0 and looper pare also arranged and operate as shownin said Letters Patent.

The material to be stitched rests upon the usual bed plate n and is held in engagement with the feeder O by the presserfoot 9, the two braids which are to be stitched together meeting in a line which is median with respect to the twoextreme positions of the needle as it is oscillated for the formation of the zigzag stitch. To prevent the possibility of overlapping ofthe two braids there is provided, slightly in advance of the position of the needle, a thin separator plate h, which, in its working position, stands with its lower end nearly touching the-bed plate a as shown in' Fig ures 2 and 3. As this separator stands but, I

a short distance in front of. the needle there [is practically no possibility of the overlap Y capable of movement out of working position. Accordingly it is formed as a part of or is secured to a movable plate h, which is frictionally supported by a fixed plate For some classes of work the close I can be lowered into or raised out of op erating position if desired.

The gage i by which the right hand edge of the work is guided in its passage through the machine, preferably bent as at #for a purpose to be described, is formed as a part of a relatively long arm 2' Which is pivoted, as at 2' upon a carrier plate 2'. The hit ter'is formed with a long horizontal slot 2', for engagement with a guide piece 91/, se cured to the bed plate an, a flanged thumbscrew 2' being provided for the purpose of holding the carrier 2 in longitudinally adjusted position upon the, bed platen, so that the gage 2' can be secured in adjusted position with respect to the median line of the needle position. It will be observed that through the PlXOlllDg of the arm 2' upon the carrier i* the gage can be swung back, as indicated by broken lines in Figure 2, out of .operative position whenever the work is to'be manipulated, and can be re stored at once to its original position, without requiring any readjustment, when the operation of stitching is to be resumed.

lVith some classes of work there may be at times a tendency of the edge of the work to curl up and to ride over the gage.

To prevent this there is mounted on the A gage arm 71 a sliding stop finger it, which may be slotted longitudinally, as at k, and

held to the gage arm 2' by a bolt and spring ally mounted on said plate and bent to.

form an upward projection, and a stop finger mounted adjustably on the gage arm and extended through the upward projection thereof.

This specification signed this 12th day of Marc-h A. D. 1923.

LOUIS BULAsKY.

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