IMPROVEMENTS IN SEWING MACHINES
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by James Galloway Weir at the Office
of the Commissioners of Patents on the 23rd August 1878.
JAMES GALLOWAY WEIR, of 2, Carlisle Street, Soho Square, in the County of
Middlesex. "IMPROVEMENTS IN SEWING MACHINES."
My Invention relates chiefly to that class of sewing machines in which the shuttle
driver or carrier oscillates upon a fixed point, and is operated in the usual manner
by a can on the feed shaft, and the said Invention is chiefly designed to simplify
the construction and lessen the cost of parts of the mechanisin in such a machine;
also to ensure great durability in the same.
According to one part of the said Invention I provide improved means for
attaching the shuttle driver or carrier to the frame of the machine, and I carry
this improvement into practice as follows, that is to say:-I form that end of the
shuttle driver or carrier which is to be pivotted or fulcrumed at the oscillating
point with a projecting piece, which is curved downwards in such a manner that
the feed shaft may pass through it. The lower part of this curved piece is formed
with a conical or taper plug or pin, which fits into an aperture in the upper
part of a screw, which passes through the bed plate of the machine, and is secured
therein by the aid of a nut at the upper part of the bed plate. A stud or pin is
also provided on the upper part of the same end of the shuttle driver or carrier,
this upper stud fitting into a lug or car cast in one piece with the pillar or vertical
support of the machine, and projecting at right angles therefrom. It will therefore
bo secu that the shuttle driver or carrier is pivotted at the top in the said ear or lug,
and at the bottom in the aforesaid screw. This arrangement provides a firm and
solid support for the pivots, and the whole of the parts are strong and durable.
According to another part of my said Invention I dispense with the said curved
projecting piece on the end of the shuttle driver or carrier, and also with the afore-
said screw, and I construct cither the upper or under part of the shuttle driver to fit
close to either the top or under side of the said ear or lug, to which it is attached by
a pin or bolt passing through a hole provided for it in the end of the shuttle driver.
This pin or bolt has a smooth surface at the part which passes through the shuttle
D
ديد

page_text: driver, and is formed with a shoulder to fit against the lug or ear, but the other end
of the bolt, namely, the part which passes through the ear, is screwed and screws
into the said ear. The screwed part of this bolt projecting beyond the ear may
be provided with a nut, so that it may be tightened or loosened as desired.
When the shuttle driver is attached to the car in the manner just described, I
may provide a support at the other end of the shuttle driver to prevent any
tendency there may be for the latter to drop at that end. This support consists
of a pin, stud, or piece projecting downwards from the shuttle driver near the
shuttle, and resting on a smooth surface of part of the frame or casting in which
the working parts of the machine are mounted. This piece slides to and fro on
the said surface in the oscillating motion of the shuttle driver, and the latter is
therefore secured from any tendency to drop.
Another feature of the said Invention consists in providing upon the feed bar
of a sewing machine a small plate of steel or other suitable metal, which plate has
a slot cut in it so that it may be adjusted to any required position by means of a
screw passing through the slot and into the bar.
The chief object of this device is to provide means for readily adjusting the feed
to the necessary height when it has sunk, by reason of the wearing away of the
surface of the cam, or of the plate itself, or both.