An Improvement in Zig-zag and Twin Needle Sewing Machines.
Year: 1891

page_text: Date of Application, 10th Apr., 1891
Complete Specification Left, 9th Jan., 1892-Accepted. 19th Mar. 1892
PROVISIONAL SPECIFICATION.
An Improvement in Zig-zag and Twin Needle Sewing Machines.
I HARREY MOORE of High Street, Wellingborough in the County of
Northampton, Machine Agent do hereby declare the nature of this invention to be
as follows:-
. This invention relates to the presser foot of zig-zag and twin needle sewing
machines.
In the case of zig-zag sewing machines employed for uniting two pieces of
material placed edge to edge without overlapping each other, the work produced
is defective when the materials to be united are of unequal thickness because the
single presser foot cannot bear evenly upon both pieces of material as required to
hold the material down firmly on the needle plate.
In the case of twin needle sewing machines employing two needles and sewing
two lines of stitches at the same time, inequality in thickness of the material in
the line of the two rows of stitches prevents a single presser foot from operating
equally for each row of stitches and thus defective work is also produced.
My improvement consists in fitting upon one and the same presser bar two
independent presser feet each being provided with a spring which tends to depress
the presser foot with which it is connected to a definite point governed by a stop ;
each presser foot being capable by the yielding action of the spring to assume a
more elevated position independently of the other, according to the thickness of the
material passing thereunder.
Dated this 10th day of April 1891.
AYRTON & THOMAS,
Patent Agents.
COMPLETE SPECIFICATION.
An Improvement in Zig-zag and Twin Needle Sewing Machines.
I HARREY MOORE of High Street Wellingborough in the County of
Northampton Machine Agent 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 :—
This invention relates to the presser-foot of "zig-zag" and "twin-needle" sewing
machines.
In the case of "zig-zag" sewing machines employed for uniting two pieces of
material placed edge to edge without overlapping each other the work produced is
defective when the materials to be united are of unequal thickness because the
single presser-foot cannot bear evenly upon both pieces of material as required to
hold the material down firmly on the needle plate.
In the case of "twin-needle" sewing machines employing two needles and
sewing two lines of stitches at the same time, inequality in thickness of the material
in the line of the two rows of stitches prevents a single presser-foot from operating
equally for each row of stitches and thus defective work is also produced.
The accompanying drawings illustrate the two presser-feet as applied to the
presser-bar.
Figure 1 is a front elevation of the presser-bar and presser-feet.
Figure 2 is a side elevation of the same and
Figure 3 is onlan of
ATS

page_text: A is the presser-bar to which is attached by the screw B the frame C, in which
two independent presser-feet D, and E are fitted in guides between which the
spring is fitted so as to bear at one end against the underside of the upper guide
and at the other end against a collar G which may be secured by the screw Hat
any convenient point upon the stem of the presser-foot according to the required
tension for the spring F: The stem of the presser-foot is prevented from rotating
by a projection K engaging in the slot L formed in the lower guide.
The arrangement thus described applies equally for both presser-feet which are.
both fitted in precisely the same way.
As described and shown in the drawings the two presser-feet are carried abreast
or side by side but a similar double presser-foot having the presser-feet fitted in the
same way but carried one in front of the other instead of side by side may be.
usefully employed with a single needle machine sewing material of irregular
thickness. In this latter case the needle would pass through the opening M of one.
of the presser-fect only.
.
Having now particularly described and ascertained the nature of my said inven-,
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A presser-bar, provided with double presser-foot mechanism substantially as.
and for the purposes described.
2. In "zig-zag" and "twin-needle" sewing machines the, employment of two
independently yielding presser-feet placed side by side substantially as and for the.
purposes described.
Dated this 9th day of January 1892
AYRTON & THOMAS,
Agents for the Applicant.