Improvements in Spiral Edges or Cutters, such as are Used in Machines for Shearing or Cropping Cloth, Wool, Silk, Cocoa Nut Matting, or the like.
Year: 1888

page_text: Date of Application, 1st Dec., 1888
Complete Specification Left, 21st Aug., 1889-Accepted, 16th Nov., 1889
PROVISIONAL: SPECIFICATION.
Improvements in Spiral Edges or Cutters, such as are Used in
Machines for Shearing or Cropping Cloth, Wool, Silk, Cocoa Nut
Matting, or the like.
I HENRY SMITH of Thirlwell Mount Heeley near Sheffield in the County of York
Engineer do hereby declare the nature of my said invention for "IMPROVEMENTS IN
SPIRAL EDGES OR OUTTERS FOR SHEARING AND CROPPING MACHINES to he as
follows:-
:-
"
This invention consists in an improved spiral edge or cutter for shearing and
cropping machines by bending the said cutter cold into a concave form during the
process of twisting, by passing the cutter through a grooved twisting wheel, which is
cut to give the concave form to the said cutter.
This particular cutter is manufactured by my improved machine for making spiral
cutters as above described, Patented the 23rd day of November 1888 and Numbered
17050.
The advantages are, greater rigidity, keener cutting edge, and requires less
frequently grinding and produces better results.
Dated this 30th day of November 1888.
GARLICK & MCGOWAN,
Agents for the Applicant.
COMPLETE
SPECIFICATION.
Improvements in Spiral Edges or Cutters, such as are Used in
Machines for Shearing or Cropping Cloth, Wool, Silk, Cocoa Nut
Matting, or the like.
I HENRY SMITH of Thirlwell Mount Heeley near Sheffield in the County of York
Engineer 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 :-
My Invention has for its object to provide spiral edges or cutters for shearing and
cropping machines which spiral edges or cutters present the advantages over ordinary
spiral edges or cutters that they have greater rigidity present keener cutting edges
require less frequent grinding and generally produce better results.
According to my Invention the spiral edges or cutters are not made with straight
webs or cutters proper, projecting at right angles and in a straight line from the root
or base as shewn in figure 1 which represents a cross section of an ordinary cutter
but are made of a curved or concave form as illustrated by figure 2 which shews in
cross section a cutter with a root or base such as is used with what are known as
bayonet or single flange cutters but the Invention is not limited in its application to
one particular kind of cutter for instance Figure 3 shews it applied to another form
of single flange cutter and Figure 4 shews it applied to a double cutter that is to say
a cutter having two blades joined by a flange common to both.
I do not limit myself to any one particular way of making the cutters according to
my Invention but I prefer to give them the concave form whilst cold and whilst they
are being twisted and I have devised a machine for the purpose which forms the
subject of my application for Letters Patent No. 17050 dated the 23rd November
1888.

page_text: Having now described and particularly ascertained the nature of this Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
A spiral edge or cutter for shearing.and cropping machines the said spiral edge or
cutter being curved or concave in cross section substantially as illustrated by
Figures 23 and 4 of the accompanying drawings.
า
1000
J. H. JOHNSON & Co.,
Agents.