Year: 1887

page_text: Date of Application, 15th June, 1887
Complete Left, 14th Mar., 1888
Complete Accepted, 20th Apr., 1888
CHARLES HOWELL BUCHANAN of 62 Sparkenhoe Street, Leicester Engineer do
hereby declare the nature of this invention to be as follows:-
My invention has for its object, to provide simple, effective, and comparatively
inexpensive mechanism forming a trimming and cutting device for sewing machines
for sewing fabrics (either woven or knitted), leather, or paper having the seams or
joinings made clear or trimmed in the process of sewing with said machines.
My invention consists in the peculiar construction and combination of parts herein-
after fully set forth having reference principally to the following points.
First to the combination with the cloth plate of a sewing machine of a bracket
secured thereto, and carrying a rigid or stationary knife whose cutting-edge is on its
lower side and which operates in conjunction with the knife attached to the feedbar
to trim the fabric while being stitched or in its passage over the clothplate.
Second. To the combination with a sewing machine of a trimmer or cutting attach-
ment composed of two knives or cutters, one vibrating or moving blade attached to
mechanism below the clothplate and effecting an upward cut while in operation, the
other a stationary or rigid knife having a fixed bearing above the cloth plate and
formed with a cutting edge on its lower side. The vibrating or moving knife acts
upwardly against the blade or cutter whenever the feedbar rises. The advantages of
the foregoing construction are simplicity, efficiency and comparative inexpensiveness.
By attaching the knife directly to the feedbar the expense of providing a special shaft
for said knife is avoided and the additional power required for such extra shaft is
dispensed with.
The cut being upwards instead of downwards the tendency of the trimmer is to
avoid the accumulation of lint or cuttings in the throat or between the clothplate and
feed bar of the machine which occurs with trimmers cutting downwardly. If desired,
the knife or upper cutter may be secured to the head of the machine through the
medium of a hanger instead of supporting it on the clothplate, its operation and

page_text: effect being substantially the same as when sustained on said clothplate and this
construction I consider as within the spirit of my invention and included in my
claims.
What I claim as my invention is as follows :-
1. In a sewing machine trimmer a stationary knife or blade, rigidly secured to the 5
clothplate on the upper side of the same in combination with a knife or blade
secured to the feed bar and operated thereby to effect an upward cut substantially as
described.
2. The combination with a sewing machine of a trimming or cutting attachment
composed of a knife or blade secured to the feedbar and moving therewith, and a
bracket sustained on the clothplate and carrying a rigid or stationary knife, blade or
cutterbar substantially as described.
1

page_text: CHARLES HOWELL BUCHANAN of 62 Sparkenhoe Street Leicester, Engineer do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
My invention has for its object, to provide simple, effective, and comparatively
inexpensive mechanism forming a trimming and cutting device for sewing machines
for sewing fabrics (either woven or knitted), leather, or paper having the seams or
joinings made clear or trimmed in the process of sewing with said machines. My
invention consists in the peculiar construction and combination of parts hereinafter
fully set forth having reference principally to the following points.
First, to the combination with the clothplate of a sewing machine of a bracket
secured thereto, and carrying a rigid or stationary knife whose cutting edge is on its
lower side, and which operates in conjunction with the knife attached to the feedbar
to trim the fabric while being stitched or in its passage over the clothplate.
Second. To the combination with a sewing machine of a trimmer or cutting attach-
ment composed of two knives or cutters one vibrating or moving blade attached to
mechanism below the clothplate and effecting an upward cut while in operation, the
other a stationary or rigid knife having a fixed bearing above the clothplate and
formed with a cutting edge on its lower side. The vibrating or moving knife acts
upwardly against the blade or cutter whenever the feed bar rises. The advantages of
the foregoing construction are simplicity, efficiency, and comparative inexpensiveness.
By attaching the knife directly to the feedbar the expense of providing a special shaft
for said knife is avoided, and the additional power required for such extra shaft is
dispensed with. The cut being upwards instead of downwards the tendency of the
trimmer is to avoid the accumulation of lint or cuttings in the throat or between the
clothplate and feed bar of the machine which occurs with trimmers cutting downwardly.
If desired, the knife or upper cutter may be screwed to the head of the machine
through the medium of a hanger instead of supporting it on the clothplate, its opera-
tion and effect being substantially the same as when sustained on said clothplate and
this construction I consider as within the spirit of my invention and is included in
my claims.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. In a sewing machine trimmer a stationary knife or blade, rigidly secured to the

page_text: cloth plate on the upper side of the same in combination with a knife or blade
secured to the feed bar and operated thereby to effect an upward cut substantially as
described.
2. The combination with a sewing machine of a trimming or cutting attachment
composed of a knife or blade secured to the feedbar and moving therewith and a
bracket sustained on the clothplate and carrying a rigid or stationary knife, blade, or
cutterbar, substantially as described.