IMPROVEMENTS IN THE APPARATUS FOR AND MANNER OF SHARPENING THE KNIVES OF MOWING & REAPING MACHINES
Year: 1885

page_text: аци малися от опагрети
the Knives of Mowing and Reaping Machines.
We RALPH HENRY CHRISTOPHER NEVILE of Wellingore in the county of
Lincoln Esquire and EDWIN WHITWORTH of Sleaford in the county of Lincoln
Engineer do hereby declare the nature of our said invention for IMPROVEMENTS
IN THE APPARATUS FOR AND MANNER OF SHARPENING THE KNIVES OF MOWING &
REAPING MACHINES to be as follows:-
In a former specification No 2361 of 1884 we described an apparatus for
sharpening the knives of mowing & reaping machines which could be operated by
the foot but which was entirely automatic as regards holding & feeding the knives
to the grinders. In order to simplify & cheapen the apparatus we now propose to
dispense with some of the automatic arrangements and to vary other parts-One
way in which we do this is to use 2 grinding discs set at a suitable angle and to
rotate them from the fly wheel either by strap or other convenient method and to
affix an adjustable guide frame to the stand so as to enable the operator to hold
and feed the knife with accuracy. The guide pieces are set at a suitable, angle
but made so as to yield under pressure to allow of more or less being ground, off
the knife and also to allow for the reduction by wear of the grinding discs-We
attach to these guide pieces an arrangement which preserves the correct pitch of
the sections forming the knife. One method of doing this is to cause one or more
of the sections of the knife to enter a carrier so formed as to centre the-section
inserted in it-All that is then needed in operating the apparatus is to place a
knife in position and press the feeding arrangement downwards & forwards by
hand or otherwise at the same time causing the discs to rotate The knife may be
maintained in its position either by hand or by a suitable clamping arrangement
and the feeding motion may be given by a lever pivotted below and jointed to the
guides instead of directly by hand if deemed more convenient-We may also fix
the knife and feed the grinders up to it by hand or by any other suitable means-
In some cases especially to suit an old and deformed knife we allow the discs to
move somewhat from their proper position one method of doing this is to give each
disc a spring adjustment vertically and to allow them also to separate somewhat
by a spring adjustment laterally-We also propose to make use of the periphery of
the grinding disc one method of doing this is to use one or more discs and cause
them to follow the angle of the section the carriage carrying the discs may-be

page_text: caused to traverse laterally in guide grooves as the knife is fed to them-Or the
carriage carrying the discs may be so made as to allow the feeding arrangement to
cause them to separate laterally.
In some cases it may be advisable to separate the discs from each other so as to
grind upon one side only of one section at a time-Or one disc alone may be used
to grind down one side of all the sections in succession and then it may be caused
to swing over and grind the other side of each section-Or a broad cylindrical
grinder may be used in which case if inclined at the proper angle it is not
necessary to travel it laterally to grind the edge of the section and in some cases
this may be convenient.
R. H., C. NEVILE,
Agent for Messrs. Nevile & Whitworth.
Improvements in the Apparatus for and Manner of Sharpening 1
the Knives of Mowing and Reaping Machines.
We RALPH HENRY CHRISTOPHER NEVILE of Wellingore Hall in the county of
Lincoln, Esquire and EDWIN WHITWORTH of Sleaford in the same county, Engineer
do hereby declare the nature of our invention for the said improvements and
in what manner the same is to be performed, to be particularly described and 2
ascertained in and by the following statement:—
11
In a former specification No 2361/84 we described an apparatus for sharpening
the knives of Mowing and Reaping Machines which could be operated by the foot
but which was entirely automatic as regards holding and feeding the knives to the
Grinder.
"
$1
In order to simplify and cheapen the apparatus we now propose to dispense with
some of the automatic arrangements and to vary other parts.
The following description and accompanying drawings shew the manner in which
we carry out our invention.
2
Fig. 1 is a front view of the grinding arrangement as a separate machine 3
operated by the foot.
Fig. 2 is a side view of the same.
Fig. 3 is a plan of the grinding & centreing arrangement.
Fig. 4 is a front view of the same.
Fig. 5 is a front view of the grinding discs arranged with a spring adjustment 3
vertically and laterally.
Fig. 6 is a side view of the same.

page_text: Fig. 13 is a front view of the same.
Fig. 14 is another arrangement using a broader cylindrical grinder.
Fig. 15 is a front view of the same.
In figs 1 and 2 the treadle A. actuates the fly wheel B which drives the pulley C
by means of a strap, &c on the same shaft as pulley C a mitre wheel D engages
with a mitre. wheel E on stud F, attached to this mitre wheel is another bevil
wheel, G which gears with wheels H & H respectively these wheels are attached to
spindles which carry at their upper ends the grinding discs I and J so that the fly
wheel being actuated a rapid motion is communicated to the grinding discs by the
gearing described.
K Figs. 1 and 2, is an adjustable guide frame carrying two sliding pieces L
and M formed so as to rece the knife to be ground N, these guides are set at a
suitable angle and the springs O, made so as to yield under pressure to enable the
operator to grind off more or less from the knife and to allow for the reduction of
the grinding discs by wear..
Figs 3 and 4 shew the feeding apparatus and guide frame in plan and front
view The sliding pieces or carriers L and M have a V shaped bearing set at a
suitable distance apart so as to centre the knife when it is inserted in the
slides, all that is then needed in operating the machine is to place a knife in
position and press the feeding arrangement downward and forward by hand or
otherwise, at the same time causing the discs to rotate.
The knife may be maintained in its place either by hand or by a suitable
clamping arrangement and the feeding motion may be given by a lever pivotted
below and jointed to the guides instead of directly by hand if deemed more
convenient.
We may also fix the knife and feed the grinders up to it either by hand or by
any other suitable means.
Figs. 5 & 6 shew the grinding discs, to yield laterally & vertically by means of
springs.
Figs. 7 and 8 & 9 shew the discs P and Q arranged so as to grind on their
peripheries, these discs are carried on bearings U & V radiating from the centre R
and are so made as to allow them to be moved nearer or further apart and thus
follow the contour of the section being ground.
These discs.are brought together by means of the spring S Fig" 7. 8 & 9 and the
feeding arrangement above described carries a wedge shaped piece, as a guide, T
which as the knife is fed to the discs enters between the radial bearings U and V
and causes them to be separated.
In some cases in using either of the above described methods of grinding the
knife it may be advisable to separate the grinding discs from each other so as to
grind upon one side only of one section at a time as it lessens the danger of over-
heating the knife and instead of using one pair of discs to grind a knife we may
use one or more pairs to follow each other, the first to rough grind and the next to
finish But this more particurlarly applies to the arrangements attached to a
Reaping or Mowing Machine. It is obvious that either wet or dry grinding may
be used in these arrangements.
Figs. 10 and 11 shew another method of using the periphery of the grinders, in
which the guiding of the grinding discs is taken from the knife section itself The
feeling pieces W and X attached to the bearings U and V cause the grinders to
follow the section being ground.
Figs. 12 and 13 shew an arrangement in which one disc is used grinding on its
edge and the knife is fed to it, above the disc Y is fixed a suitable grinding stop Z

page_text: made of any suitable material (we find hard wood suitable) and the knife N being
inserted in the guide pieces K on the frame K¹ which pivots on a centre below the
disc to allow the frame to tilt over to an angle suitable for grinding both edges
of the section. In operation the knife edge is placed by the side of the stop & fed
forwards on the disc.
Fig 14 & 15 show an arrangement of one broad cylindrical grinder in which it
is not necessary to traverse the knife laterally in order to grind it but in operating,
it only requires to be inclined at a proper angle to follow the edge of the section
being ground.
This inclination of the knife is obtained from the pivotted frame K¹.
Having now particurlarly described and ascertained the nature of our said
Invention & in what manner the same is to be performed we declare that we do
not confine ourselves to the exact form or arrangement described, as the details
may be varied but what we especially claim is
Firstly. The arrangements for grinding the knives of Reaping & Mowing
machines substantially as herein before described and illustrated at figs 1 and 2..
2ndly The guide frame & centreing arrangement substantially as described &
illustrated at Figs. 3 and 4.
3rdy The self adjusting arrangement of the grinding discs substantially as
described and illustrated at figs 5 and 6.
4thly The arrangement of the grinding discs and the method of causing them
to follow the shape of the section being ground substantially as described and
illustrated at fig" 7. 8 and 9.
5thly The arrangement of the grinding discs and grinding apparatus substantially
as described and illustrated at figs 10 and 11.
6thly The grinding arrangement substantially as described and illustrated at
fige 12 & 13.
7thly The combined arrangement for grinding as described and illustrated at
fig³ 14 and 15.
Dated this 3rd day of June 1886.