IMPROVEMENTS IN ROLLERS OR SURFACES FOR SHARPENING KNIVES USED IN SEVERING PILE. THREADS OF DOUBLE PILE FABRICS WOVEN FACE TO FACE
Year: 1884

page_text: I TITUS SALT & Director of "Sir Titus Salt Bart, Sons & Company, Limited"
of Saltaire in the County of York Manufacturer, do hereby declare the nature of
my invention for IMPROVEMENTS IN ROLLERS OR SURFACES FOR SHARPENING
KNIVES USED IN SEVERING PILE. THREADS OF DOUBLE PILE FABRICS WOVEN FACE
TO FACE, to be as follows:-
My invention consists in making the Rollers wholly or in part of Spongy or
Porous Rubber, of such great elasticity that the Rollers will easily conform to the
shape of the knife while it is being sharpened.
In the cutting or dividing of double pile fabrics, woven face to face, means are
required for making the cutting edge of the knives very sharp and keeping them
of the proper form for cutting, this is usually effected by the employment of
wooden rollers on an iron spindle, such rollers being covered with common rubber
and the rubber covered with leather, the emery or other grinding substance being
placed upon the leather, but the results obtained have not been perfectly
satisfactory.
I have found that by forming the whole of the sharpening Rollers of rubber,
(except the spindle and the leather cover) and by the employment of Spongy,
Porous or such like description of rubber or its compounds which is characterised
by its ready compressibility, owing to its being composed of a mass of cells or air
spaces divided by thin walls of rubber, that the elasticity of the rollers is so much
increased that they will readily adapt themselves to any form (within useful
limits) that may be given to the knife and still keep the cutting edge to the proper
degree of sharpness.
To effect this object the Rollers may be made wholly of the Spongy rubber, or
partly of common rubber and partly of Spongy rubber. One arrangement which
I have found to work well is to have the hole which fits the iron spindle lined
with common rubber and the outside of the roller, upon which is fitted the leather
cover, coated with common rubber, the intermediate space being of the spongy
or porous kind, but these arrangements of the spongy or porous rubber may be
varied.

page_text: COMPLETE SPECIFICATION.
I TITUS SALT a Director of "Sir Titus Salt Bart, Sons & Company Limited"
of Saltaire in the County of York Manufacturer do hereby declare the nature
of my invention for IMPROVEMENTS IN ROLLERS OR SURFACES FOR SHARPENING
KNIVES USED IN SEVERING PILE THREADS OF DOUBLE PILE FABRICS WOVEN FACE
TO FACE and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
My invention consists in making the rollers wholly or in part of spongy or
porous rubber, of such great elasticity that the rollers will easily conform to the
shape of the knife while it is being sharpened.
In the cutting or dividing of double pile fabrics, woven face to face, means are
required for making the cutting edge of the knives very sharp and keeping them
of the proper form for cutting. This is usually effected by the employment of
wooden rollers on an iron spindle, such rollers being covered with common rubber
and the rubber covered with leather, the emery or other grinding substance being
placed upon the leather, but the results obtained have not been perfectly
satisfactory.
I have found that by forming the whole of the sharpening rollers of rubber
(except the spindle and the leather cover) and by the employment of spongy,
porous or such like description of rubber or its compounds which is characterised
by its ready compressibility, owing to its being composed of a mass of cells or air
spaces divided by thin walls of rubber, that the elasticity of the rollers is so much
increased that they will readily adapt themselves to any form (within useful
limits) that may be given to the knife and still keep the cutting edge to the proper
degree of sharpness.
To effect this object the rollers may be made wholly of the spongy, rubber, or
partly of common rubber and partly of spongy rubber.
In the accompanying drawings are shewn various forms of arrangement
relatively of the solid and spongy rubbers. In Figure 1 by side view and by end
view in Figure 4 is shewn one arrangement which I have found to work parti-
cularly well and in which the hole which fits the iron spindle b is lined with
common rubber (2) and the outside of the roller a upon which is fitted the leather
cover c coated with common rubber (1) the intermediate space (3) being of the
spongy or porous kind-the second rollers below in each case being shewn,
externally and the upper rollers being shown in section to better indicate con-
struction.
In Figures 2 and 3 by sections and side views and in Figures 5. 6. 7 and 8 by
end views are shewn other relative variations of arrangement of the spongy and
common vulcanised rubbers the same letters and numbers indicating the corre-
sponding parts.
Figures 2 and 5 show the outer ring or coating of common rubber (1) omitted
and the mass of spongy rubber increased in proportion.

page_text: Figures 3 and 7 show the inner ring of common rubber (2) increased to the same
thickness as that of the spongy rubber (3) and Figure 6 shows the inner ring of
common rubber omitted (2) and the spongy rubber proportionately increased.
I do not confine myself to the foregoing or any particular proportions or
arrangements of the spongy rubber employed in the manufacture of the said
rollers or surfaces for sharpening the said knives as these may be considerably
varied.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I would have it
understood that I make no claim generally to the use of common vulcanised
rubber or solid rubber for cores of sharpening rollers or surfaces for sharpening
knives for severing pile threads as I am aware that rollers have been made of
common cured or vulcanised indiarubber before but I declare that what I claim is
The use of spongy, porous or such like description of rubber or its compounds
either alone or in combination with common solid vulcanised rubber for the rollers
or surfaces carrying the sharpening means for the knives used in severing pile
threads of double pile fabrics woven face to face.