US7931A - Improvement in sewing-machines - Google Patents

Description

2 Sheets-$heet 1..

GROVER & BAKER.

Sewing Machine.

' Patented Feb. 11, 1851. 1

Pllell ll I I l u. PETERS. Phda-Uhognphor. Wuhinflon. \z c.

GROVER & BAKER. 2 Sheetksh? v Sewing Machine.

Patentgd Feb. in, 1851. y

I Md MW M my I N. PETERS. Pink-lithograph. Washington. an

UNITED STATES PATENT OFFICE.

\v. o. cnovnn, or nosrox, AND WM. E. Barren, 0F ROXBURY, MASS.

IMPROVEMENT lN SEW ING MACHINES.

- Specification forming part of Letters Patent No. 7,931, dated February 11,1851.

f0 all whom it may concern:

Be it known that we, W. 0. Gnovnn, of Boston, in the county of Suffolk and .Sttate of Massachusetts, and \V. l). BAKER, of Boxbury, in the county of Norfolk and State More said, have invented certain new and useful Improvements in Sewing Machinery; and we do hereby declare that the following description, taken in connection with the accompanying drawings, hereinafter referred to, forms a full and exact description of the same, wherein we have set forth the nature and principles of our said improvements, by which our invention may be distinguished from others of asimilar class, together with such parts as we claim and desire to have secured to us by Letters Patent.

thread, either by a rotary or a traverse move ment, and the forming of a double-loop stitch by the peculiar movements of said two needles and their respective threads.

A A A A A is the frame-work of the machine, which may be constructed as shown in the drawings, or in any other suitable way, to sustain the operative part of the apparatus. The two pieces of cloth to be joined'or seamed are placed on the platform a a a J, and fed along by the feeding-rolls b b c and band (2 d, which are made to move intermittently and after each stitch, by means which will be referred to in the sequel. The thread for the two needles is wound on the spools e f, which are supported and turn on horizontal spindles g g h h, having hearings in the upright portion A A of the frame-work. A suitable" degree .of friction is brought to bear on these spools, so as to prevent the thread from unwinding too easily by the springs t k, which are operated, respect-ively, by screws Z m, in amanner well understood by mechanics.

'1; is the vertical. needle, with the eye formed at a proper distance from the point, as is usual in other kinds of sewing-machines, and fixed in the socket end of the needle-arm o o, as

shown in Fig. 2. Thethread which supplies this needle comes from the spool c, andis passed through a hole in the spring-guide pp and through the eye of the needle, in the direction shown by the blue line in Fig. 2. This needle turns or vibrates on the -short shaft 'q,. Figs. 1 and 2, and is operated by means of the arm '1' r, attached to it at a proper point, andworked up and down by means of the eccentrio or cam s on the driving-shaft t t, which by the red lines in Fig.1, said red lines bep, ing dotted when the thread is under the plat form a. a a. The horizontal needle derives its reciprocating motion in a proper direction from the lever-rod W W, which turns on the fulcrum 0:, one end of which rod clasps the elongated study, depending from the under side of the holder'o 1;,while the'othe'r end has'a roller. z,.fitted on it against the face of the cam a a on the driving-shaft, by the revoln tions of which the needle 1/. is moved forward, the retractingspring b b (shown by dotted lines in'Fig. 1) operating to draw it back again. The cam a a also actuates one end of the lever o c,which turns on the fulcrum d, and works the pawl e',which turns the ratchet-wheelf' on the roller 0 of theset of feeding-rolls before referred to. i

The operation of the machine is as follows: The cloth is placed, as before described, on the platform a a a, which has a proper hole in it for the play of the vertical needle, which passes through the cloth and forms a loop on the under side of the cloth, and the horizontal needle passes through this loop, forming another loop beyond, and holding the first loop until the vertical needle is drawn up and pressed down'again, (through the loop formed by the horizontal needle,) which draws up the loop first made and forms the double-loop stitch, as hereinabove first suggested, and

which is a detail View of said stitch, 810., on a and uniting two pieces of cloth or forming the which is particularly represented in Fig. =1, 1 tally, substantially as hereinabove described, 5

large scale. I seam by means of the Gamble-100p stitch, as Having thus Qespribed (ifllf improvpn10x1is, hcrcinabovc set forth. we shalLstate our claim as fofimvsz'; "What we 1 WVM: 0.: GROVER.

claim our invention, and dvsirc: to have XVM. 1']. BAKER. cured to us by Lot'fm's Patent, 1s \K itncsses:

The use oftwonvedlos opal-atingaltonmtch', I Emu LINPOLN,

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