IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR GRINDING AND SURFACING STONES
Year: 1885

page_text: I, GEORGE NEWSUM of N° 5, Fairfax Road, Beeston Hill, Leeds, in the County
of York, Printers' Engineer, do hereby declare the nature of my invention for
IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR GRINDING AND SURFACING
STONES to be as follows:-
This invention relates to certain improvements in apparatus for the grinding
and surfacing of lithographic or other stones, and has for its object the arrange-
ment of a machine in such a manner, that stones of various thicknesses can be
operated upon by the grinding or surfacing head, by which the face of the stone is
brought to a perfectly straight, level, and smooth surface, and to the same
thickness throughout; which I accomplish in the following manner:
I form the bed plate with a trough at each side, and in the centre between the
troughs, I place a plate having a number of inclined planes formed thereon, above
which is fitted the table of the machine prepared with corresponding inclined
planes. The stone to be operated upon is fixed to the machine table, above which
is a reciprocating grinding and surfacing head so arranged, that it will yield when
grinding the prominent parts of the stone, and when desirable, the grinding.or
surfacing portion of the head may be made to rotate at the same time as it is
reciprocating.
The bed plate is made to traverse slowly backwards and forwards in the
machine frame, the grinding and surfacing head moving at the same time in a
transverse direction, and in order to regulate the height to suit the various
thicknesses of stones to be operated upon, the second named plate is adjusted by a
screw which causes the same to ascend or descend the inclined planes on the bed
plate, thus bringing the face of the stone more or less into contact with the
grinding and surfacing head.
1 1
WAUGH & CHAPMAN,
Agents for the Applicant,
70, Chancery Lane, W.C.

page_text: Improvements in the Method of and Apparatus for Grinding
and Surfacing Stones.
I GEORGE NEWSUM, of N° 5 Fairfax Road, Beeston Hill, Leeds, in the County of
York, Printers 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 by the following statement :-
This invention relates to certain improvements in apparatus for the grinding
and surfacing of lithographic or other stones; and has for its object, the arrange-
ment of a machine in such a manner, that stones of various thicknesses can be
operated upon by the grinding or surfacing head, by which the face of the stone
is brought to a perfectly straight, level, and smooth surface, and to the same
thickness throughout.
The invention consists of a table having a reciprocating motion, upon which the
stone to be operated upon is secured, above which is a grinding and surfacing head,
inade to reciprocate on suitable slide bars transversly to the table, and to rotate
at the same time; the head being arranged, so that it will yield when grinding
the prominent parts of the stone.
In the accompanying drawings, Fig. 1 represents an end elevation of the
grinding and surfacing machine. Fig. 2, a side elevation of the same, and Fig. 3
an enlarged detail of the grinding head, part of which is shewn in section.
The bed plate A, is formed with a recess or trough at each side, and towards the
centre between the troughs, may be placed an adjustable plate having four
inclined planes formed thereon. Resting upon the inclined planes, are corresponding
inclines of the table upon which the stones to be operated upon are fixed, and
which is adjusted in height to suit the various thicknesses of stones, by means of a
screw passing through the table or bed plate A, which causes the inclines of the
bottom or adjustable plate to ascend or descend the inclines of the top plate; thus
bringing the face of the stone more or less into contact with the grinding and
surfacing head; or the inclined planes may be dispensed with, and the grinding
head adjusted to suit the various thicknesses of stones, which are fixed between
the screws B of the table or bed plate. A.
The table A, is made to traverse to and fro by the bevel wheels C, operating the
worm C¹, wheels D, and pinion D¹, the latter gearing into the toothed rack D³,
secured to the underside of the table or bed plate A, which rests upon the planed
tracks E.
When the table A, has traversed in either direction the distance required, one of
the adjustable dogs G, comes in contact with a projection on the bar G¹, connected
to the belt lever G, and thereby causes the same to move on its fulcrum, and
come in contact with one of the pins H, on the belt guide bar H¹, the weight W,
near the end of the belt lever G³, causing the belt to be moved from one fast
pulley P, to the other, the centre pulley P₁ being free to revolve on the shaft.
.
The frame of the grinding head J, receives its reciprocating motion by the
disc plates K, in which are formed for the reception of a stud, slots for regulating
the length of the traverse of the grinding head.

page_text: Upon the stud secured in the said slots, is mounted the connecting rod L, which
is also attached to the grinding head frame J, which moves in suitable slides: the
bottom of the frame at J¹, being arranged for the reception of water, which is
allowed to escape through the tap O, on to the grinding head J².
Rotary motion is given to the grinding head Je by the pitch chain M, which is
stretched between the driving wheel N, and the adjustable wheel N¹, the chain
being kept in contact with the wheel S, by the pulley S. The wheel S, is secured
on the same shaft as the bevel wheel T, which gears with the bevel wheel T¹,
secured on the spindle S2 by means of a feather key, thereby allowing the said
spindle to be moved through the wheel when necessary.
When it is desired that the grinding head J' should cease rotating, and only
reciprocate; the pitch chain M. is removed from the machine, by sliding the
adjustable wheel N¹ towards the grinding head, by which the tension of the chain
is released, thereby enabling it to be removed.
The grinding head J2 is brought into contact or clear of the stone on the table A,
by means of the worm U and wheel U', operated by the hand wheel U³, by which
the worm wheel U¹, is made to revolve around the extended and screwed
portion S3 of the spindle; the bottom end of the screwed portion S³ being prepared
with a collar V, is enclosed in the recess formed in the enlarged end of spindle S²;
a space being left between the collar V and the bottom of the recess, in order to
allow the grinding head J' to yield when grinding the prominent parts of the
stone.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The combination of the parts of the apparatus for grinding and surfacing stones
all arranged substantially in the manner shewn and described.
The arrangement by which a reciprocating and rotary motion is given to the
grinding head, substantially in the manner shewn and described.
The arrangement by which the grinding head is allowed to yield when grinding
prominent places on the stones.
T