IMPROVEMENTS IN KNIFE-CLEANING MACHINES
Year: 1882

page_text: LETTERS PATENT to William Henry Dinham Jones, of No. 30, Torrens Road,
Brixton Risc, in the County of Surrey, for an Invention of "IMPROVEMENTS
IN KNIFE-CLEANING MACHINES."
PROVISIONAL SPECIFICATION left by the said William Henry Dinham
Jones at the Office of the Commissioners of Patents on the 4th February
1882,
WILLIAM HENRY DINHAM JONES of No. 30 Torrens Road Brixton Rise in the
County of Surrey. ‘IMPROVEMENTS in Knife-cleaning MachinES.”
#
In knife cleaning machines as they are usually constructed the knife is held
between two revolving discs covered with leather or other like material which is
served with emery or other polishing powder. These discs being rigid are apt to
exert a grinding action on the thicker part of the knife blade, leaving the thinner
part towards the edge comparatively untouched. The object of my Invention is to
secure by a simple construction a more equal action on all parts of the knife blade
and to avoid the injury which the knife is apt to sustain in machines of ordinary
construction. For this purpose I secure the leather or other soft facing material to
discs which are dished in the middle and have a certain degree of elasticity so that
they can yield allowing the soft facing to accommodate itself to the wedge form of
the knife blade. The discs are for this purpose notched radially so as to present a
star shape with rays projecting beyond their middle parts, and the two discs aro
preferably so set on their spindle that the rays of the one face the spaces between
the rays of the other. The leather or other facing is secured to the discs by rivets
in the dished parts of the discs so that they are out of reach of the knifo. The
elasticity may be obtained by employing clastic spokes projecting beyond the
central discs and pressing against the leather. According to a modified con-
struction the leather or other facing is made to project beyond the circumference of
the discs which in this case are not notched, and a pair of conical rollers mounted
on spring bearings are arranged to press together the projecting annular portions of
the leather or other facing, so that the knife inserted with its edge between the
rollers is rubbed by the facing material over its whole width. The polishing
powder may be supplied from a box or hopper fixed at the side of the machine and
communicating with a tubular spindle which has lateral perforations in the space
between the discs, so that as the spindle revolves portions of the powder escape
into the middle space and pass to the facing material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Henry Dinham Jones in the Great Seal Patent Office on
the 1st August 1882.
WILLIAM HENRY DINHAM JONES of No. 30 Torrens Road Brixton Rise in the
County of Surrey. IMPROVEMENTS IN KNIFE-CLEANING MACHINES."
14
In knife cleaning machines as they are usually constructed the knife is held
between two revolving discs covered with leather or other like material which is
served with emery or other polishing powder. These discs being rigid are apt to
exert a grinding action on the thicker part of the knife blade, leaving the thinner
part towards the edge comparatively untouched. The object of my Invention is to
secure by a simple construction a more equal action on all parts of the knife blade
and to avoid the injury which the knife is apt to sustain in machines of ordinary
construction. For this purpose I secure the leather or other soft facing inaterial to
discs which are dished in the middle and have a certain degree of elasticity so that
they can yield allowing the soft facing to accommodate itself to the wedge form of
the knife blade. The discs are for this purpose notched radially so as to present a
star shape with rays projecting beyond their middle parts and the two discs are
preferably so set on their spindle that the rays of the one face the spaces between
the rays of the other. The leather or other facing is secured to the discs by rivets
in the dished parts of the discs so that they are out of reach of the knife. The
elasticity may be obtained by employing elastic spokes projecting beyond the
central discs and pressing against the leather. According to a modified con-
struction the leather or other facing is made to project beyond the circumference
of the discs which in this case are not notched, and a pair of conical rollers mounted
on spring bearings are arranged to press together the projecting annular portions
of the leather or other facing, so that the knife inserted with its edge between the
rollers is rubbed by the facing material over its whole width. The polishing
powder may be supplied from a box or hopper fixed at the side of the machine and
communicating with a tubular spindle which has lateral perforations in the space
between the discs, so that as the spindle revolves portions of the powder escape
into the middle space and pass to the facing material.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side view and Fig. 2 a sectional plan of one construction of a knife
cleaning machine according to my Invention. A A¹ are the two elastic discs made
with rays a a¹ arranged so that the rays a on the one side face the intervals
between the rays a¹ on the other side. Bare the two rings of leather or soft
material between which the knife C is inserted, these rings being secured to the
discs A. A' by rivets 6 situated in the dished parts of the discs so as to be out of
reach of the knife. The knife is steadied by an abutment D carried by an arm
projecting from the framing. The polishing powder may be supplied to a hollow
wheel E (shewn in elevation at Fig. 3 and in vertical section at Fig. 4) whence it
passes along a hollow portion of the axle F and issues into the space between the
discs by a small transverse hole f. The wheel E being screwed on the end of the
axle as shewn in Figs. 2 and 4 can be turned by hand so as to adjust the pressure
exerted by the discs on the rings B. A number of knives may be cleaned at one
time as shewn at Fig. 5 and in this case as the knives remain stationary and are
not moved outwards and inwards during cleaning the rings B of leather or soft
material are made sufficiently broad to act on the whole length of the knife
as shewn by the sectional plan Fig. 6. Instead of employing elastic radiated discs
to press the leather rings towards each other the discs may be rigid with elastic

page_text: spokes G projecting from them radially and bent towards each other as shewn in
elevation at Fig. 7 and in vertical section at Fig. 8. In this case the polishing
powder may be supplied to a cavity H formed in the outer disc. The discs may be
made with separate axles as shewn in Fig. 9 being kept in position by collars
bearing against the frames. Figs. 10 and 11 shew respectively a side view and an
end view, and Fig. 12 a sectional plan of a modified construction according to
which the rings of leather or soft material B are pressed against the knife by
conical rollers K K which are mounted on springs L L. These rollers are arranged
at such a level relatively to the knife that they cause the pressure to be directed
over its inclined surfaces.
Having thus described the nature of my Invention and in what manner the
same is to be performed I claim :—
First. The construction of knife cleaning machine wherein two rings of leather
or other suitable soft material between which the knife is inserted are pressed
towards each other by elastic rays or spokes of the revolving discs to which the
rings are secured substantially as herein described.
Second. The modified construction of knife cleaning machine wherein the two
rings of leather or other suitable material between which the knife is inserted are
pressed locally towards each other by rollers mounted on springs substantially as
herein described.
In witness whereof I the said William Henry Dinhamn Jones have hereunto
set my hand and seal this Twenty eighth day of July in the year of our
Lord One thousand eight hundred and eighty two.