Improvements in Grinding Apparatus for Sharpening the Combs and Cutters of Shearing or Clipping Machines.
Year: 1893

page_text: Date of Application, 9th June, 1893
Complete Specification Left, 9th Mar., 1894-Accepted, 28th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in Grinding Apparatus for Sharpening the Combs
and Cutters of Shearing or Clipping Machines.
I, JOHN WALKER NEWALL, of Forest Hall, Ongar, in the County of Essex,
Engineer, do hereby declare the nature of this invention to be as follows:-
According to this invention a ring-shaped grinding wheel is used, mounted on
a spindle which is preferably vertical.
The cutter to be ground is held by a swinging frame, which swings around a
spindle as an axis.
This spindle is parallel to, or inclined to the grinding wheel spindle, according
as it is wished to grind the cutters flat, or slightly hollow.
The arm which swings on the second spindle is provided with arrangements
for pressing the faces of the arm on which the cutters to be ground are held to
and from the edge of the grinding wheel.
Where two or more kinds of cutters are used on one machine it is preferable
to have two or more arms to the swinging frame one end being prepared to
bold each separate kind of cutter.
Cutters to be ground may be held by a screw which screws into them from the
back and draws them against the face of the arm or against points fixed thereon.
Or I may have an oblong slot in each cutter and use a T headed bolt drawn
back by a spring and which can turn round: the head of the bolt is arranged
to be sunk below the surface of the cutter to be ground.
The cutter is kept from turning by two pins fitting into the holes, or equivalent
means.
A groove and pin, or analogous means are used so that when the T bolt head
is in a position across the length of the slot in the cutter, the bolt is prevented
from turning and so the cutter cannot jar loose.
Suitable gearing, pulleys, or other means are provided for driving the grinding
wheel, also screw, or other adjustments, for regulating the pressure, and otherwise
adjusting and controlling the action of the moving parts.
Dated the 9th day of June 1893.
NEWNHAM BROWNE.
COMPLETE SPECIFICATION.
Improvements in Grinding Apparatus for Sharpening the Combs
and Cutters of Shearing or Clipping Machines.
.
I, JOHN WALKER NEWALL, of Forest Hall, Ongar, in the County of Essex,
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 bys
the following statement :-
This invention relates to an improved grinding machine for enabling both the
reciprocating and the stationary cutter or comb of shearing or cutting machines to
be truly applied to the grinding surface by which such cutters are sharpened.
This improved grinding machine is illustrated in the accompanying drawings, in
which:-
Fig. 1 is a side elevation (partly in section) of the machine complete, and

page_text: .
Fig. 3 is a longitudinal section of the shaft on which the double ended arm or
holder for carrying the shear cutters or combs and for applying same truly to the
grinding surface is mounted.
Figs. 4 and 5 are detail views of the means employed for securing the shear
cutters or combs to the double ended arm or holder, and supporting same truly
thereon.
Fig. 6, is a plan view of a cutter or comb provided with a special hole for
enabling same to be secured to the double ended arm or holder.
and
The machine consists essentially of a frame F in which the different parts of
the apparatus are supported. In such frame a shaft A is mounted in suitable
To
bearings, and is fitted with fast and loose pulleys B, B', for actuating same.
the forward end of this shaft A a face ring G of emery or other suitable material
is secured. Another shaft H is also mounted in bearings in the frame F,
is truly parallel with the shaft A, the forward end of such shaft H carrying a
double ended arm or holder I, so that same can be turned with its shaft to bring
either end opposite the grinding ring G. One end of the arm or holder 1 is
provided with means for carrying shear cutters, and the other end with means for
carrying shear combs, such means being hereinafter described more in detail.
The shaft H is mounted in its bearings in the manner shewn, so that the action
of a spring J (Fig. 3) tends to force the double ended arm or holder I against
the grinding disc G.
For this purpose the shaft H revolves in bearings f, f', of the frame F, and its
rear end is acted upon by a screw K working through a bush in the rear of
bearing, and fitted with a hand wheel for operating same. The spring J bears
against a collar & secured to shaft H, and a second collar h¹ mounted loosely on
such shaft and abutting against the forward bearing f¹ of such shaft, such collar h¹
carrying a pin or screw engaging a slot in the shaft, so as to permit endwise but.
prevent rotary movement of the collar in relation to the shaft. It will thus be
seen that the action of spring J is to tend to force the shaft H and double ended
arm or holder I towards the face of grinding ring G, the position to which screw K
bas been adjusted or set limiting the extent of such movement, and being altered
as the grinding proceeds.
When the parts have been set to the proper position to bring the cutter carried
on one end of the arm or holder I in contact with the face of the grinding
ring G, the cut is effected by causing such arm to swing to and fro across the
face of such ring, either by hand or by any suitable mechanical means.
Referring now to the means for securing the combs or cutters to the double
ended arm or holder I, the arrangement shewn at the bottom end of the arm in
Figs. 1 and 2 is suitable for securing the combs, while that shewn at the upper
end is suitable for securing the cutters. In the former case three pins P1, P2, P³,
are mounted on the inner face of the arm, and are all ground off in a plane to suit
the surface of the comb or cutter to be held thereon. Two longer pins S', S²,
are also mounted on the same face of the double ended arm or holder. These
pins S1, S2, pass through holes s¹, s2, in the comb or cutter to be ground (see
Fig. 6) or such pins may be caused to e rage the comb or cutter in any other
suitable manner so as to prevent same snifting while being ground. A. pin Q
passes through the centre of the arm and has its end g made of T or other
suitable shape, as shewn in Fig. 4, while an L shaped slot R is formed in the
body of same, and with the latter a pin engages. A spring T tends to force
the pin Qoutwards. The comb or cutter is formed with an oblong, oval, or other
suitably shaped slot L (Fig. 6), through which the T shaped end g of pin Q
can pass.
The following is the method of mounting the comb or cutter on the arm-
The comb or cutter is slipped on to the pin Q so that the T shaped end thereof
passes through the slot L of the comb, and the pins S1, S2, pass through the
holes s', s, of the comb. The pin Q is then given a quarter turn and its spring T
then forces same outwards and presses the comb or cutter against the plane surface

page_text: formed by the three pins P1, P2, P3, thus securing same firmly and truly in position.
for being accurately applied to the face of the grinding ring G, when the arm or
holder I is swung to and fro across the face thereof.
The means for securing the cutter to the opposite end of the arm or holder I
are similar to those above described, and consist of the pins S', S', the centre
pin Qand the pins P1, P³, but such pins are as shewn somewhat differently.
arranged in order to make same more suitable for securing the cutter firmly and
truly thereto; and further, the pin P³ is in this case made compound (as shewn
in detail in Fig. 5), so that it presents two bearing points for the cutter to rest
against, and is pivotted centrally between such points. The cutter will therefore
have four points of support, i.e., against pins P1, P2, and the double points of the
pin P³, but as the latter is pivotted centrally, there will be only three points of
support mathematically, and the cutter will thus be held in equilibrium.
This four point support (provided by making pin P³ compound as described) is.
not necessarily confined to the arrangement for clamping the cutter, but may be
equally well applied to the holding of the comb if desired.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
:-
In a machine for grinding the combs or cutters of shearing machines-
1. A swinging arm provided with three pins ground in a plane to suit the
surface of the comb or cutter to be held thereon and a central pin having a T or
other suitably shaped head to pass through a hole formed in the comb or cutter
to be ground, such pin being capable of a partial rotation and being acted upon
by a spring tending to draw the back of the comb or cutter into contact with the
three above named pins, the whole in combination with other pins carried by such
arm and which pass through corresponding holes in, or otherwise engage, the
cutter to be ground, so as to prevent same turning, substantially as specified.
2. In the arrangement described in the preceding claim making one of the three
pins or points of support which are ground in a plane to suit the surface of the
comb or cutter to be held thereon in the form of a compound pin, so as to provide
two points of support on such pin for the cutter to be ground, and pivotting such
compound pin centrally between such two points of support, substantially as
specified.
3. A shaft mounted in suitable bearings in a frame and suitable means for
rotating same, such shaft carrying a face grinding ring, in combination with a.
second shaft mounted truly parallel to the former and carrying a swinging arm
provided with means for securing cutters thereto, in combination with means for
holding the cutter to be ground as above described, and means for regulating the
movement of the arm towards such grinding ring as the grinding proceeds, all
substantially as specified.
Dated this 9th day of March 1894
ALLISON BROS.,
Agents for the Applicant.