US1764573A - Sewing-machine work support - Google Patents

Description

June 17, 1930. c. w. MUELLER SEWING MACHINE WORK SUPPORT Original Filed Oct. 15, 1927 3 Sheets-Sheet l Ottorneg 'June 17, 1930. c. w MUELLER 1,764,573

SEWING MACHINE WORK SUPPORT Original Filed Oct. 15, 1927 3 Sheets-Sheet 2 ,7 luunumm mnmnm I llllllllllllH inventor,

C/zarZwWMueZlen 3w 1/ Av Gttomcg June 17, 1930. c. w. MUELLER SEWING MACHINE WORK SUPPORT Original Filed Oct. 15, 1927 3 Sheets-Sheet 3 J I l l l I l l I I 1 l I 1 Ill-l I l I I r HU HI U I 1 w Patented June 1930 UNITED, STATES, PATENT OFFICE CHARLES W. MUELLER, OF ST. LOUIS, MISSOURI, ASSIGNOR TO LEWIS INVISIBLE STITCH MACHINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MAINE SEWING-MACHINE WORK SUPPORT Original application filed October 15, 1927, Serial No. 226,398. Divided and this application filed July 7,

- 1928. Serial No. 291,001.

This invention relates to new and useful improvements in sewing machine work supports generally, although the invention is especially adapted for use in connection with blind switch sewing machines.

This application is a division of the application filed by me October 15, 1927, Serial o. 226,398 for improvements in blind stitch sewing machines.

Among the several objects of the invention are to provide a sewing machine frame having a work support mounted thereon whereby the working position of the support may be adjusted towards or from a fixed presser foot; to provide a fixed presser foot and means 7 for adjusting the working plane thereof relative to the working plane of the work support whereby the planes of the foot and work support may be adjusted to parallelism and thereby properly function with materials of different thicknesses or weights; to

provide a frame of a construction which will insure maximum room for the work and which will greatly eliminate the danger of the work contacting with the main operating parts of the machine, and to provide a spring retainedwork support which is pivoted in front of the presser foot whereby said support may be swung downwardly in rear ofits pivot and away from the foot for the purpose of permitting the-work to be readily inserted or removed whenever desired.

With these and other objects in View which will more fully appear, the' nature of the in- Figure 3 is a left hand elevation of the machine, part of the cover being broken to better disclose the looper bar and the top "feed lever Figure 4 is a detailed side elevation showing the means for detachably connecting thepresser foot to the frame,

Figure 5 is a detailed sectional view showing the adjustable stop for the work support, and

Figure 6 is a sectional view showing the adjustable spring connection between the work sgpport and frame.

Like reference numerals designate corresponding parts throughout the several figures of the drawings.

Referring to the accompanying drawings,

my improved sewing machine includes a.

frame A which comprises a base 5 having a standard Gextending upwardly along the front edge of the base, a post 7 which extends upwardly from the rear right hand corner of the base, a horizontal arm 8 which extends laterally from the upper end of the post 7 and overhanging the left hand edge of the base 5, and a horizontal arm 9 which extends forwardly from the overhanging end 'of the arm 8, the forward end of the arm 9 terminating at a point considerably in rear of the standard 6. The horizontal arms 8 and 9 are hollow and the supporting post -7 is likewise hollow. This post 7 curves forwardly at its lower end and forms a raised and hollow rib like structure, 10 which extends forwardly to the standard 6, as shown in Figures 1, 2 and 3. The left hand side ofthe rib 10 is curved downwardly as at 11 i and merges with the upper flat surface of the base 5.

Journaled in the horizontal arm 8 is a rotary main shaft 12 having a combined driving pulley and hand wheel 13 fixed to the outer right hand end thereof. Journaled in the forwardly extending horizontal arm 9 is an oscillatory needle shaft 14 which is oscillated from the main shaft 12 by a connec, tion 15 of suitable construction. The shaft 14 extends forwardly beyond the end of the 7 arm 9 and fixed to the projectingend is a needle arm 16 to which a curved needle 17 is attached by a clamp 18. Cooperating with the needle 17 to form a line of single thread blind stitches, is a looper 19 which is fi'xed to a looper bar 20 pivotally supported as at 21 on the arm 9 and actuated from the main shaft 12 .by a connection 22.

A Stationary presser foot 23 is disposed directly below the needle 17 and also below 5 the looper 19. This presser foot is detachably connected to the arm 9 through the medium of a fork 23 which is formed on the rear end of the presser foot and which cooperateswith a threaded stud 23 'fixed to the underside of the arm 9, and a clamping nut 23, and cooperating with this foot is a work I presenting mechanism which includes a combined ridge forming and work feeding disc 24, and a work clamp 24*.

Journaled on a horizontal axis 25 at the upper end of the standard 6 is a work support 26 which is normally disposed in a substantially horizontal plane. This work support extends rearwardly ofthe standard 6 and has a straight rear edge 27 which is disposed in parallelism to the axis 25 and is located in a vertical plane extending at right angles to the needle rock shaft 1 k and slightly in rear of the path of needle oscillation. The 25 Work support 26 is formed at-its left rear corner with a reduced extension 28 which projects towards and under the presser foot In order to yieldably retain the Work sup- .30 port 26 in a substantially horizontal plane, and also to provide means for adjusting the plane of the work support relative to the presser foot, I have provided the following mechanism: The work support 26 is provided at its forward edge with a depending arm 29 which is disposed in front of the standard 6 of the frame, as shown in Fig. 3. The arm 29 is formed with an opening 30 for receiving an adjusting screw 31. A coil spring 32 has one end connected to the. rear end of the screw 31 and the other end connected to a lug 33 which extends downwardly from the Y rib 10 of the frame. The spring 32 passes through an opening 34 formed in the rib 10.

possible point away from the stitch forming An adjusting nut 35 is threaded onto the' ing plane of the worksupport. The nut 39 is provided with a ratchet 40 for engagement by a spring finger 41 fixed to the arm 29 so as to'retain the screw 36 in any position of adjustment.

It is of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I- claim:

In a sewing machine, the combination with a frame "including a base, a forwardly extending horizontal arm, and a standard extending upwardly from the front of the base and located in' front of the forwardly extending horizontal arm, of a presser foot carried by the forward end of said horizontal arm, a substantially horizontal work support pivoted on the standard and extending rearwardly under the presser foot, said work sup port having an arm extending downwardly and disposed in front of said standard, an adjustable pin mounted in the arm of the Work support, a spring connected to the frame and to the pin for urging the work support upwardly toward the presser foot, and a nut threaded on the pin and cooperating with the front face of the arm for adjusting the tension of said spring, and an adjustable stop carried by the arm of the work support for cooperation with the standard to variably limit the upward movement of the work support.

In testimony whereof I hereunto aifix my signature. CHARLES W.

mechanism. As a result, the work as it is fed through the machine will not contact with the spring. 1

The arm 29 is also provided "with an adjusting screw 36 which has threaded engagement in a threaded opening formed in said arm. The rear end of the screw 36 bears against a flat shoulder 37 formed in the standard 6 and 65 a pair of clamping nuts 38 are threaded onto

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