Year: 1899

page_text: We, WILLIAM ROBERTSON, Engineer, and JOHN KNIGHT, Mechanic, both of
Wallace Foundry, Dundee, in the County of Forfar, North Britain, do hereby
declare the nature of this invention to be as follows, that is to say:-
This invention relates to overedge sewing machines of the kind described in
Robertson, Orchar, and Adie's Patent Specification No. 14,762 of 1892, and in
which a helical needle is used for sewing sacks and the like; and its object is
to improve the construction and action of the pressing bar by which the seam
or parts being sewn are held down upon the feed chain. Hitherto in such
machines there has been a single pressing bar held by two overhanging rods to
which springs are applied; and when doubled or thickened parts of the material
such as in some cases occur at the entering or terminal end of a scam, pass
under the bar, this bar becomes slightly tilted so as not to press efficiently on a
part of the seam which is consequently liable to be displaced or drawn in by
the tension of the sewing thread. By the present invention the pressing bar
is provided with two pressing parts which are hinged at their inner ends and
a separate small spring is interposed between each such part and the upper part
of the bar. With this arrangement the pressure is maintained upon the seam
in the rear of a thickened part of the material, and the defective action herein-
before referred to is avoided.
Dated this Twenty-second day of February 1899
We, WILLIAM ROBERTSON, Engineer, and JoHN KNIGHT, Mechanic, both of
Wallace Foundry, Dundee, in the County of Forfar, North Britain, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, that is to say:--
This invention relates to overedge sewing machines of the kind described in
Robertson, Orchar, Adie, and Robertson's Patent Specification No. 14762 of
1892, and in which a helical needle is used for sewing sacks and the like; and

page_text: its object is to improve the construction and action of the pressing bar by which
the seam or parts being sewn are held down upon the feed chain.
Hitherto in such machines there has been a single pressing bar held by two
overhanging rods to which springs are applied; and when doubled or thickened
parts of the material such as in some cases occur at the entering or terminal
end of a seam, pass under the bar, this bar becomes slightly tilted so as not to
press efficiently on a part of the seam which is consequently liable to be dis-
placed or drawn in by the tension of the sewing thread. By the present inven-
tion the pressure is maintained upon the seam in the rear of a thickened part
of the material and the defective action referred to is thereby avoided.
And in order that the said invention and the manner of performing the same
may be properly understood we hereunto append a sheet of explanatory drawings
to be hereinafter referred to in describing our improvements.
The accompanying drawings show the parts of the machine to which the
improvements are applied Figure, 1, being a plan, and Figure, 2, a front eleva-
tion of the improvements. In these drawings the same reference letters are
used to mark the same or like parts wherever they are repeated.
In carrying out the present invention the pressing bar, A, is provided with
two pressing parts, B, C, connected at their inner ends by a hinge piece, D,
and a separate small spring, E, is interposed between each pressing part
and the upper part E. of the bar. Overhanging rods. G, H, are fitted to the
upper part, F, and to the lower pressing parts, B, C, of the bar, and springs J, K,
arranged as formerly in boxes, L, M, on the framing of the machine. act on
the rods and impart the requisite pressure to the pressing bar. With the
improved arrangement as hereinbefore described the material, having-a-thick--
ened part, as it passes under the pressing bar is held firmly in position on the
feed chain, N, the pressure being maintained upon the seam in the rear of the
thickened part of the material so that the seam is kept from being displaced or
drawn in by the tension-of-the-sewing-thread.
Having now particularly described and ascertained the nature of our said
invention and in what mannor the come in to be naufammad
1
EDMUND HUNT,
Applicants' Agent.