US101926A - Improvement in feed-operating mechanism for sewing-machine - Google Patents

Description

Patented April 12, 1870.

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NOWELL F.

SAWYER, OF HAVERHILL, MASSACHUSETTS.

Letters Patent No. 101,926, dated April 12, 1870.

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern:

Be it known that I, NowELL F. SAWYER, of Haverhill, in the county of Essex and State of Massachusetts, have invented an Improvement in Sewing-Machine Feeds; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sufiicientto enable those skilled in the art to practice it. This invention relates to the detail of construction and arrangement of devices in sewing-machines, by which is produced what is known as the four-motioned feed, and by which the devices, which move a serra- .ted'or roughened feeding face upward and forward, and downward and back, are easily attached to machines originally constructed with a wheel-feed.

The drawings show only those parts of a sewingmachine which are necessary to the illustration of my invention,

Figure 1 exhibiting my improvement in end elevation, and Figure 2, in side elevation, the dotted lines 2 z representing the top of a sewing-machine bed in both figures.

a represents one part of the main shaft of the machine, the shaft being made in two parts, each having on their adjacent ends crank-disks, connected by a crank-pin, b, which crank-pin also works a connecting-link, c, the lower end of which takes hold of a rocker-arm, d, on the rocker-shaft e, to which partial rotations are imparted by rotation of the main shaft in the direction indicated by the arrow seen on the crank-disk in fig. 1.

0n the rocker-shaft c, at the end most remote from the feed, is pivoted a piece having a long arm, f, and a short arm, g, and on the other end of the rockershaft e is pivoted a piece, theupper arm h of which is tubular, and the lower 41 of which like the arm g, forms a bearing for the shaft and the arm 43 extends below shaft j, so that a projection from arm 6, in which is made a nut, may enter a fork in the end of arm k, fixed on'shaft j.

The parts are represented as attached to the machine known in the market as the Empire machine,

in which the hangers, represented in' dotted lines in fig. 2, and marked 3 3 support the rocker-shaft e,

which, in said machine, moves a pawl, which operates the feed=wheels, is an arm, I, the salient end of which bears a pin embraced by the slotted end of a bar, at,

which bears the feeder n, which is moved in a suitable slot cut through the sewing-machine bed or table, or a throat-piece fixed therennto.

The other end of bar m has pivoted to it a plunger, which can slide in the tube k, which is slotted, so that a pin or roll fixed to the plunger can project through the slot in tube h, so that the roll or pin 0 can be acted upon bythecam 1), adj nstably fixed on shaft 0.

By the action .of cam 12 on the roll 0, the upward movement is given to the arm m by the plunger in tube h, by which the feeder is projected above the work support. I

The connecting-rod c has upon one edge, asgseen m fig. 1, an incline, g, which, in the upward movement of rod 0, impinges against the end of arm f, and imparts to it a vibration, which, throughshaft j and arms i and It, is communicated to the feeder m, and spring 4' operates when roll 0 and arm f are relieved from their motors to both draw down the feeder and to draw it back.

The screw 5, which passes through the nut t, attached to arm a, serves as a means for adjusting the .length of the forward and back reciprocations of the feeder n, which is accomplished by setting, by means of said screw, the end of arm f relatively to the incline q, the nearer the arm f is set to the said incline, the greater will be the amount of motion which said incline will impart to said arm, and vice verse. 7

The end of shaft j, which carries the arm is and projects through the arm i, is screw-threaded, and provided with a nut, u, by which arms 70 and i are clamped firmly together after the relation of said arms has been determined by adjustment of screw s.

In making new machines, instead of altering old ones, the pin on which the slotted end of the bar at is supported and slides, will be fixed in any suitable support designed for that purpose.

1 claim the shaft j, with its arms f, g, and k, arranged as described, so as to be operated by move:

. ment of an incline on the connecting-rod c, to impart the forward feeding motion to the feeder n, leaving the spring 1' free at the proper time to produce the reverse movement of the feeder.

NOWELL F; SAWYER.

Witnesses J. B. (inosnv, L. H. Lumen.

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