Improvements in Machinery for Grinding the Swaged or Bevilled Edges of Cutters and other like Articles.
Year: 1887

page_text: Date of Application, 6th Dec., 1887
Complete Specification Left, 6th Sept., 1888
Complete Specification Accepted, 9th Nov., 1888
Improvements in Machinery for Grinding the Swaged or Bevilled
Edges of Cutters and other like Articles.
1, JOHN MCGREGOR of Newhall Road Sheffield in the County of York Manager
do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in apparatus or machinery, for holding and
grinding cutters and other articles having swaged or bevilled edges, such for example
as machine knives of various kinds, with straight or curved edges, Reaper Sections,
and the like; the object of the invention being to enable the operator to grind large
numbers of such articles as above mentioned, with rapidity and uniformity.
In carrying out my invention, I construct a double side frame rising above the
stone, which is carried by an axlo of the usual construction, and driven in the usual
manner.
The sides of the frame between which the stone revolves, are somewhat similar to
the sides of a planing machine, having a vertical face, with a recess or opening in
which a vertically fitted screw is held for the purpose of raising and lowering a cross
shaft carried by two bearing blocks, one of which works against the face of each
standard, and engages with the threads of its corresponding screw.
The vertical screws are caused to revolve by means of a bevil wheel secured to the
top of each screw, and gearing into other bevil wheels fixed upon a horizontal shaft
having a handle to turn it with, and thus the bearings with the cross shaft can be
raised or lowered as desired.
The said cross shaft can be moved to and fro longitudinally in the bearing blocks, as
well as turned partially round upon its own axis, such motions being distinct or
simultaneous as desired.
Near the centre of the cross shaft I fix a balanced arm, the back part carrying the
weight, and the front part having a clamping arrangement to hold the work, which
may be varied in its construction to suit the articles intended to be operated upon.
I adjust the balance weight to raise the clamping jaw or workholder from the stone,
(automatically) when released by the workman; the use of the vertical screws and

page_text: sliding bearing-blocks being to enable the position of the cross shaft to be adjusted,
so as to bring the work upon the face of the stone at any desired angle, and also to
follow the stone as it becomes reduced in size.
It will thus be seen that the article held in, and projecting from, the Clamp, can be
pressed upon the stone by turning the cross shaft in the proper direction, and can be
traversed across the face of the stone by sliding the cross shaft horizontally through its
bearings, the workman putting on the required pressure as he causes it to travel across
from side to side.
<
For holding reaper sections" (or the triangular cutters used in reaping machines)
I fix a central templet upon the bottom jaw of the clamp, its sides being at such an
angle that when one edge of the reaper section is placed against it, the other hevilled
edge will be parallel with the line of the cross shaft, and square with the face of the
stone, and vice versa when reversed. The section may be clamped in position by
means of a set screw passing through the top jaw, or by other equivalent devices.
When it is desired to grind the swaged edge of a curved blade, the clamp is
arranged on slides so that it may be moved at will to follow a templet of the required
shape, and so bring the edge of the blade at a suitable angle to the face of the
stone, while for circular or semicircular knives a revolving motion can be given to the
clamp.
I keep the face of the stone true and properly roughed, by means of a rotary
hacker having a number of blades fixed diagonally, at equal distances round its
periphery. The Hacker is fixed upon a horizontal shaft parallel with the cross shaft
before mentioned, and can be traversed across the face of the stone by hand. The shaft
with the hacker is carried by a slide which can be forced forward by means of
a rack and pinion, aided by a worm and worm wheel or other equivalent mechanism.
Dated the 5th day of December 1887.
ROBT. F. DRURY,
Agent for the Applicant.

page_text: Improvements in Machinery for Grinding the Swaged or Bevilled
Edges of Cutters and other like Articles.
I, JOHN MCGREGOR of Newhall Road, Sheffield in the County of York Manager
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 relates to "improvements in apparatus for holding and grinding
cutters and other articles having swaged or bevilled edges" such for example as
machine knives of various kinds with straight or curved edges, Reaper sections and
the like.
The object of the invention being to enable the operator to grind large numbers of
such articles with rapidity and uniformity.
And in order that the invention may be clearly understood I annex a sheet of
drawings illustrating same.
Fig. 1, is a side elevation of a machine as arranged for grinding reaper blades and
siniilar straight work.
Fig. 2, is a plan of same.
Fig. 3, appliance for swaging curved blades.
Fig. 4, appliance for swaging segmental blades.
In carrying out my invention I construct a double side-frame A rising on each side
above the stone B which is carried by an axle C of the usual construction, and is driven
in the usual manner.
The sides A of the frame between which the stone B revolves are somewhat similar
to the sides of a planing machine having a vertical face with a recess or opening D,
in which is fitted a screw E for the purpose of raising and lowering a cross shaft F
carried by two bearing blocks & which work against the face of the standards, and
engage with the screws E the said screws being caused to revolve when required by
means of a bevil wheel H secured to the top of each screw, and gearing into another
bevil wheel I fixed on a horizontal shaft J-which can be turned by a handle in the
usual manner, and thus will raise or lower the bearing blocks G and shaft F.
The cross shaft F can be moved to and fro longitudinally in its bearings, as well
as turned partially round upon its own axis, such motions being distinct or simultaneous
as desired.
Near the centre of the cross shaft F I fix a balance arm K the back part carrying
weight L, and the front part M having a clamping arrangement to hold the work
which may be varied in its construction to suit the shape of the articles required to be
held.
The balance weight L can be adjusted so as to raise (automatically when released)
the clamping jaw M or work holder, from the stone.
The use of the vertical screws E being to enable the position of the cross shaft F
to be adjusted, so as to bring the work upon or against the face of the stone at any
desired angle, and also to follow the stone as it becomes reduced in diameter by
wear.

page_text: It will thus be seen that the article N (such as a reaper blade) held in and
projecting from the clamp M can be pressed upon the stone by turning the cross shaft
in the proper direction, and can be traversed across the face of the stone, by sliding
the cross shaft (F) horizontally through its bearings G; the attendant putting on the
required pressure as he causes the article N to travel across the stone from side
to side.
"
For holding straight edged cutters" (or the triangular cutters used in reaping
machines) which are shown in the drawings, I use a central template P fixed upon
the bottom jaw of the clamp M its sides being at such an angle that when one edge
of the reaper section N is placed against it, the other edge to be bevilled will he
parallel with the line of the cross shaft F and square with the face of the stone, and
the same with the opposite edge of the "section"-The sections or other blades may
be clamped in position, one on each side of the template P by set screws passing
through the top jaw as shown, or by equivalent means.
When it is desired to grind the swaged edge of a curved blade, the clamp is
arranged as shown in Fig. 3 or Fig. 4. The appliance in Fig. 3 is for swaging curved
blades, and it consists of a pivotted holder Q to which the blade is attached, fixed on
the shaft F, and having a guide pin R working in a slot S, or a shaped face or its
equivalent corresponding with the required shape of the blade, so that the blade will
be brought into the desired position against the stone, as the shaft F is moved
backwards and forwards.
The appliance shown in Fig. 4, is adapted chiefly for segmental work the blade
holder being worked upon its centre pin by means of a worm and worm wheel as
shown.
To keep the face of the stone true, and properly roughed for grinding purposes, I
use a rotary hacker T, consisting of a number of diagonally placed blades upon a
block fixed on a horizontal shaft parallel with the face of the stone, and so that it can
be traversed to and fro by hand; the shaft on which the hacker is fixed can be forced
forward towards the stone by means of a rack and pinion U worked by a worm and
worm wheel V, or by other equivalent mechanism.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1st. The combination of the various improvements in apparatus for holding and
grinding the swaged or bevilled edges of cutters or other like articles and for trueing
the stone, substantially as hereinbefore described and as shown in Figs. 1 and 2 of the
annexed drawings.
2nd. In combination with a grindstone and frame the appliance for grinding or
swaging curved blades or the like substantially as described and as shown in Fig. 3.
3rd. In combination with a grindstone and frame the appliance for grinding or
swaging curved blades or the like substantially as described and as shown in Fig. 4.
ROBT. F. DRURY,
Bank Buildings, George Street, Sheffield,
Agent for Applicant."
ROBT. F. DRURY,
Bank Buildings, George Street, Sheffield,
Agent for Applicant.