IMPROVED MACHINERY OR AP- BAD DRESSING MILLSTONES
Year: 1853

page_text: LETTERS PATENT to William Edward Newton, of the Office for
Patents, 66, Chancery Lanc, in the County of Middlesex, Civil
.. Engincer, for the Invention of "IMPROVED MACHINERY OR AP-
BAD DRESSING MILLSTONES." A communication
Sealed the 28th June 1858, and dated the 3rd May 1853.
PROVISIONAL SPECIFICATION left by the said. William Edward
Newton at the Office of the Commissioners of Patents, with his
Petition, on the 3rd May 1853.
I, WILLIAM EDWARD NEWTON, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN MACHINERY OR APPARATUS' FOR
DRESSING MILLSTONES" to be as follows:-
This Invention consists in the adaptation to the spindle of an
erdinr millstone of an apparatus whereby the stories may be dressed
and picked, without the employment of other power or motion than that
of the revolving spindle. When the stones are to be dressed, the toj
stone or runner must of course be removed, and the apparatus placed
on the bottom stone. he pick or chisel is mounted in a suitable
socket, which is secured to a bearing which slides on a square guide
bar, corresponding in curve to the curve of the lines on the stone; or,

page_text: if preferred. the guide may be quite straight. This guide bar is
mounted in bearings extending from a central hollow shaft which sur-
rounds the rotary spindle of the millstone. To this spindle is secured,
in any convenient manner, a small lift wheel or tappet wheel, which, as
it rotates, acts against the lower end of an arm extending from the
guide bar. By this means the guide bar, and consequently the socket
which holds the pick or chisel, is lifted up, and the latter is allowed to
drop on to the face of the stone. The attendant will, therefore, only
be required to move the socket of the chisel along the guide bar, and
the pick or chisel will continue to make blows on the line correspond-
ing to the guide bar as long as the central shaft continues to revolve.
SPECIFICATION in pursuance of the conditions of the Letters Patent.
filed by the said William Edward Newton in the Great Scal
Patent Office, on the 3rd November 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
WILLIAM EDWARD NEWTON, of the Office for Patents, 66, Chancery
Lane, in the County of Middlesex, Civil Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Third day of May, in the year of
our Lord One thousand eight hundred and fifty-three, in the six-
teenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Edward Newton, Her special
license, that I, the said William Edward Newton, my executors, ad-
ministrators, and assigns, or such others as I, the said William Edward
Newton, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "In-
PROVED MACHINERY OR APPARATUS FOR DRESSING MILLSTONES," being a
communication from abroad, upon the condition (amongst others) that
I, the said William Edward Newton, by an instrument in writing
under my hand and seal, should particularly describe and ascertain

page_text: the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal
Patent Office within six calendar months next and immediately after
the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Edward Newton, do
hereby declare the nature of the said Invention, and in what man-
ner the same is to be performed, to be particularly described and
ascertained in and by the following statement, reference being had
to the Drawings hereunto annexed, and to the letters and figures
marked thereon (that is to say):
This Invention of improved machinery for dressing millstones, and
which has been communicated to me by my foreign correspondent, con-
sists in the adaptation to the spindle of an ordinary mill of an apparatus
by which the millstones may be picked and dressed, without the employ-
ment of other power than that of the revolving spindle.
And in order that others skilled in the art may make use of and apply
the present Invention, I will proceed to describe its nature and operation,
reference being had to the accompanying Drawings, in which Fig. 1, is
a perspective view of the millstone, with the apparatus in a working
position. Fig. 2, is a section through the apparatus. Figures 3, 4, 5, 6,
and 7, are various views of different detached parts of the apparatus, and
will be referred to hereafter. In Figure 1, X' is the millstone. C, is an
annular base, block, or pedestal secured to the bed stone or mill bush
by screw's passing through the holes a, (Fig. 2,) or in any other appro-
priate manner. B. is a circular head piece, resting and revolving
freely upon the pedestal C. E, is a slotted arm attached to and making
part of the circular head B. A, is a bed piece of cast iron or other
suitable material, from one end of which rises a screw standard F,
which passes through the slot in the horizontal arm E. G, is a nut
working upon the standard F, by tightening which the bar or head
piece A, is clamped fast to the slotted arm and head piece B. H, is a
standard rising from the other end of the bed piece A. I, is a rocking
shaft, which may be straight or curved, according to the shape of the
furrow to be dressed, and is mounted in gudgeons K, at each end, (see
Fig. 4,) which fit in bearings of the standards F, and H. L, is a

page_text: slotted arm fitting tightly upon the square portion M, of the rocking
shaft I. This arm is made in two parts L, and I, which are made
adjustable one to the other, and. tightened together by the screw b, for a
purpose which will be hereafter explained.
From the cam N, a rocking motion is communicated to the shaft 1,
through the arm IL, O, is an arm fitted to the shaft I, and sliding
freely thereon. Upon the end of this arm is the hammer socket P, which
is bored at right angles to the arm 0, to receive the shank of the
pickstock Q. The shank c, of the pickstock passes up through the
hammer socket. and is secured by the nut d. R, is the pick secured
to the pickstock Q. S, are washers, which are taken from above the
hammer socket, and placed below it, as the pick wears away. N, is a
cam having steps or inclines f. This cam is secured to the mill spindle,
and as the latter revolves, the inclines f, are brought beneath the roller
or point e, by which means the arm or "driver" L, is caused to rise
and fall, for the purpose of giving the requisite motion to the pick.
This cam N, rests and revolves upon the pedestal C, and is held in its
place by the metallic ring T, which also confines the circular head-
picce B. The blow of the hammer is increased and regulated by the
spring g, one end of which bears against the metallic arm h, upon the
rock shaft I, and the other against the lever k, having its fulcrum at ?.
The short arm of this lever bears against the curved arm of the lever m,
which has its fulcrum at n. When this lever is in such a position that
the short arm of the lever k, rests against the lever m, near its point p,
the spring is but slightly compressed, and exerts a corresponding
influence upon the rock shaft and pick. When the lever m, is in such
a position that the lever k, bears against it near the fulcrum n, the
spring g, is forcibly compressed, and the pick is thrown down with
a corresponding increase of force. The handle of the lever m, is placed
within reach of the operator, so that at any instant he can vary the
force of the blow as he finds the quality of the stone to vary.
Fig. 4, is a detached view of the bar I, when the furrows to be
dressed are straight. When the stone is cut with a circular dress,
this bar must be made of a curve corresponding to that of the furrow,
as in Fig. 5.

page_text: In Fig. 7, is represented a construction of the arm O, which has
been adopted upon some of the machines... in order to enable the
operator more thoroughly to dress the lands after. the furrows are com
pleted. O, is the hammer socket, having a slot in which the pickstock.
is allowed to move back and forth, the motions of the latter being,
governed by the screw g.
:
>
The operation of the machine is as follows: The runner being
removed, the pedestal C is firmly secured to the eye of the lower stone.
and the circular head-piece B, is placed upon it; the cam N, is fitted to
the spindle, and the plate T is secured in place. The cam is thus left
free to revolve with the spindle, and the head piece B to revolve as it is.
moved by the operator. In proportion to the "draft" to which the
stone is to be dressed, the standard F is moved along the slot in,
the arm E, until the line of motion of the pick is tangential to. the cir-
cumference of the draft circle; the bed piece then remains stationary.
As the arm 0, is moved along the bar I, the pick R will trace a
furrow of the required draft; the bar I, becoming a perfect guide for
any furrow, it only being necessary, when the machine is onco adjusted,
to set the spindle in motion, and through the cam N, to give the
necessary motion to the pick, which is moved along its guide rod I, by
hand, as required, the operator keeping one hand upon the lever -m,
that he may instantaneously vary the force of the blow as the stone
varies in hardness. For the purpose of enabling a machine of a size
adapted to dressing stones of any particular diameter to operate upon
others of a large diameter, without the necessity of employing extra
bed pieces, shafts, and other parts, I have adopted the following plan,
as represented in Fig. 3. The arm E, is revolved, so as to make an
obtuse angle with the bed piece A, and shaft I; the arm L, as before
stated, being made in two portions, and adjustable in any position, so
that it may still reach the inclines upon the cam N. By this means
the effective length of the shaft I, is increased, and the same machine
is adapted to dressing stones of different diameters.
It may be well to mention that it is necessary to provide two cams
with the inclines set in opposite directions, as all millstones do not
5 rotate in the same direction; then either cam may be used as the
case may require

page_text: When the runner is to be cut, it is turned upside down upon the
bed stone, and the machine is placed upon its surface, in the same
inanner as before, upon (the bed stone; but in this case the spindle
not being long enough to reach the cam N, recourse is had to the
contrivance represented in Fig. 6. X, is the top of the mill spindle,
and ya false spindle, which is of the same form as the top of the
mill spindle. Attached to this false spindle y, by the bent rod y', is
the eye x, which fits on to the top of the mill spindle, and thus raises
the false spindle so as to make it form an extension or continuation
of the mill spindle. The false spindle y, is then passed through the
cam N, which is driven as before, and the machine is operated.
After the furrows have been cut, it becomes necessary that the
surface of the stone bo tooled or dressed in lines parallel with the
furrows; and where the arm O, is constructed, as in Figures 1, and 3,
this can only be accomplished by moving the bar A. During the
operation this it is desirable to avoid, and for this purpose I have
sometimes adopted an arrangement substantially similar to that repre-
sented in Fig. 7. The instrument having been adjusted to cut the
inain furrows A', when these are completed, the lands B', are dressed
in lines b¹, parallel with the furrows A', by screwing in the hammer
socket P, as each successive line is dressed, without moving the bar A.
It is evident that this machine may be so arranged as to dress mill-
stones that are furrowed, both to the right and left, as the bars A, and I,
may be shifted over to the other side of the standard F, the arm O
also being reversed so as to work upon the opposite side of the bar I.
What I claim as new in the present Invention, and desire to secure
by Letters Patent, is,―
First, banging the arm which carries the pick upon a shaft I, which
receives a vibratory motion through a cam N, driven by the mill
spindle or other spindle provided for the purpose, the said' arm being
moved lengthwise along the shaft for the purpose set forth.
Second, I claim the combination of the pedestal C, the head piece B,
and the cam N, constructed and operating in the manner substantially
as described, by which means a solid bed is secured for the cam to
revolve upon, and the tremor produced by its rapid motion is not
transmitted to the head piece B, and bed piece A.

page_text: Third, the combination of the slotted arm E, with the bed piece A,
and the head piece B, by which means furrows may be dressed tangent
to any draft circle, without the necessity of moving the bed piece
during the operation.
Fourth, the employment of washers S, for the purpose of raising or
lowering the pickstock, in proportion to the length of the pick.
Fifth, the method of instantaneously adjusting the force of the blow
by the motion of the lever m, for the purpose set forth.
Sixth, making the arm L, in two parts, as described, for the purpose
of increasing the effective range of the pick.
In witness whereof, I, the said William Edward Newton, have
hereunto set my hand and seal, this Third day of November, in
the year of our Lord One thousand eight hundred and fifty-
Witness, J. W. MOFFATT,
66, Chancery Lane.
W. E. NEWTON. (L.S.)