Improvements in Over-edge Sewing Machines.
Year: 1892

page_text: Date of Application, 16th Aug., 1892
Complete Specification Left, 10th May, 1893-Accepted, 17th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Over-edge Sewing Machines.
We, WILLIAM ROBERTSON, and JAMES GUTHRIE ORCHAR, of Wallace
Foundry, Dundee, in the County of Forfar, North Britain, Engineers,
WILLIAM ADIE, of the same place, Draughtsman, and THOMAS ROBERTSON,
of the same place, Foreman, do hereby declare the nature of this invention to be
as follows, that is to say :-
Our said invention relates to over-edge sewing machines of a kind described in
Edmund Hunt's Patent Specification, No. 2856 of 1878 and the main feature of
which is a continuously rotating needle in the form of a conical regular helix ; and
our object is to improve the construction of parts of such machines.
In carrying out our invention we employ, as heretofore, three grooved conical
drivers to act on the needle, the middle one being at the back and the others at
upper and lower front parts of the needle. The back driver is fixed to a duplex
bevil wheel having one set of teeth gearing with intermediate bevil wheels or
pinions above and below it, which intermediate wheels drive the upper and lower
needle drivers. The other set of teeth of the duplex wheel gear with a bevil
wheel on a horizontal driving shaft which is parallel to the thread barrel; and this
set of teeth is recessed into a part of the wheel in order to obtain a more compact
arrangement of the parts with a more direct driving action.
The needle drivers with their bevil wheels, instead of being overhung on studs
as heretofore, are carried on spindles which have both ends held in the framing,
this framing being cast of a special form such as to support the spindles at both
ends. The top needle driver has both ends of its spindle supported in a separate
piece which is jointed to the fixed framing and which can be turned over with the
driver to allow the needle to be placed in position or withdrawn.
The needle is prevented from getting out of its proper position by a stationary
guide thimble projecting within the coils of the needle. This thimble which is
annular, the thread barrel passing through it, has hitherto been a separate piece ;
we however form it upon the end of a long bush or tube which carries the thread
barrel, and we make the bush movable longitudinally in the framing so that it can
be drawn away from the needle space to allow of the introduction or withdrawal
of the needle. A key is provided for securing the bush in the working position.
The increased length of the bush is of advantage in supporting and steadying the
thread barrel.
The presser plate or bar which holds down the border of the sacking or other
material to be sewn upon the feeding chain is made with a lowered step-like part
along its outer edge, or along part of that edge, such lowered part bearing down
the material below the upper surface of the feed chain at the outer edge of that
chain and preventing the sewing action from dragging the material inwards.
Dated this Fifteenth day of August 1892.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Over-edge Sewing Machines.
We, WILLIAM ROBERTSON, and JAMES GUTHRIE ORCHAR, of Wallace
5 Foundry, Dundee, in the County of Forfar, North Britain, Engineers,
WILLIAM ADIE, of the same place, Draughtsman, and THOMAS ROBERTSON,
Price 8d.1

page_text: of the same place, Foreman, 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 :-
Our said invention relates to over-edge sewing machines of a kind described in
Edmund Hunt's Patent Specification, No. 2856 of 1878, and the main feature of
which is a continuously rotating needle in the form of a conical regular helix ; and
our object is to improve the construction of parts of such machines.
In carrying out our invention we employ, as heretofore, three grooved conical
drivers to act on the needle, the middle one being at the back and the others at
upper and lower front parts of the needle. By our present improvements the
drivers are more steadily supported and the parts are rendered more compact.
And-in order that our 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 drawings show the parts of the machine to which the improvements are
applied. Figure, 1, being a plan, Figure, 2, a front elevation, Figure, 3, a horizontal
section, and Figure, 4, a sectional end clevation, the drivers and intermediate wheels
being supposed removed in the last figure but indicated by dotted lines. In these
drawings the same reference letters are used to mark the same or like parts
wherever they are repeated.
The back driver, A, is fixed to a duplex bevil wheel, having one set of teeth, B,
gearing with intermediate bevil wheels or pinions, C, above and below it, which
intermediate wheels, C, drive the upper and lower needle drivers, D, E. The
other set of teeth, F, of the duplex wheel gear with a bevil wheel, G, on a horizontal
driving shaft, H, which is parallel to the thread barrel, J; and this set of teeth is
recessed into a part of the wheel in order to obtain a more compact arrangement of
the parts with a more direct driving action. The needle drivers, A, D, E, with
their bevil wheels, B, K, L, instead of being overhung on studs as heretofore, are
carried on spindles, M, which have both ends held in the framing, N, this framing
being constructed of a special form as shown in the drawings and such as to
support the spindles, M, at both ends. The top driver, D, has both ends of its
spindle, M, supported in a separate piece, P, which is jointed to the fixed framing, N,
and which can be turned over with the driver, D, to allow the needle, Q, to be placed
in position or withdrawn.
The needle, Q, is prevented from getting out of its proper position by a
stationary guide thimble, R, projecting within the coils of the needle. This
thimble, R, which is annular, the thread barrel, J, passing through it has hitherto
been a separate piece; we however form it upon the end of a long bush or tube, S,
which carries the thread barrel, J, and we fit the bush so as to be movable
longitudinally in the framing and so that it can be drawn away from the needle
space to allow of the introduction or withdrawal of the needle A key, T, is
provided for securing the bush in the working position. The increased length of
the bush, S, is of advantage in supporting and steadying the thread barrel, J.
The presser plate or bar, U, which holds down the border of the sacking
or other material to be sewn upon the feeding chain, V, is made with a lowered
step-like part, W, along its outer edge, or along part of that edge, such lowered
part bearing down the material below the upper surface of the feed chain, V, at
the outer edge of that chain, and preventing the sewing action from dragging the
material inwards.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. In over-edge sewing machines of the kind referred to, fixing the back needle
driver to a duplex bevil wheel constructed and combined substantially as hereinbefore
described and shown in the accompanying drawings.

page_text: 2. The carrying of the needle drivers and intermediate wheels on spindles
supported at both ends substantially as herein before described.
3. The improved construction of the thimble as part of the bush carrying the
thread barrel the said bush being movable longitudinally and secured by a key
substantially as hereinbefore described.
4. The improved construction of presser plate or bar the same being made with
an outer lower part substantially as and for the purposes hereinbefore described.
Dated this Ninth day of May 1893.
EDMUND HUNT,
Applicants' Agent.