IMPROVEMENTS IN MACHINERY FOR GRINDING POLISHING, FACING AND GRAINING LITHOGRAPHIC STONES
Year: 1884

page_text: and Graining Lithographic Stones.
I WILLIAM GREAVES, of Vincent Works, New Wortley, Leeds, Lithographic
Engineer, do hereby declare the nature of my said invention for "IMPROVEMENTS
IN MACHINERY FOR GRINDING POLISHING, FACING AND GRAINING LITHOGRAPHIC
STONES," to be as follows:
I employ a frame, upon which are mounted a series of flange pulleys on which
the bed or table carrying the stone travels on which is a rack by an adjustable
slot in a disc or arm mounted on a suitable shaft with pulleys, a, second rack is
placed on the cross frames in which an intermediate wheel gears and also gears in
the rack on table, the intermediate wheel is connected by a fork and connecting
rod to the disc or arm, which is adjustable to suit the amount of motion required
in table I impart the motion to the rubber or polisher at right angles to the table
by vertical and horizontal shafts on which are bevel wheels gearing with the shaft
carrying the disc or arms or other suitable gearing or motion to give the necessary
cross or right angle motion-I attach to the vertical shaft an arm in which is a
regulating slot the arm carries the connecting rod to the rubber, I employ two
stays to support two shafts across the machine on which is mounted a slide to
guide the rubber, the slide fork and upright screw are so arranged as to impart
to the rubber a partial rotary motion as well as a cross or right angular motion.
Dated this 23rd day of December 1884.

page_text: Improvements in Machinery for Grinding, Polishing, Facing,
and Graining Lithographic Stones.
I WILLIAM GREAVES, of Vincent Works, New Wortley, Leeds, in the county
of York, Lithographic 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 :-
I employ a frame upon which are mounted a series of flanged pulleys, on which
the bed or table (carrying the stones to be polished) travels, on the underside of
the table is a rack and a second rack on the frame, a spur wheel gears into the
two racks, the wheel is carried on the stud of a forked connecting rod, the other
end of the connecting rod is attached to a stud in the slot of a disc which is
secured on the driving shaft, on which is multiple gear, there is also an horizontal
shaft at right angles to the driving shaft; this shaft drives the vertical shaft which
operates the rubber frame by means of the arm and connecting rod, the arm having
a slot for adjustment of motion, it being adjustable to suit the different heights of
the stones to be polished by a series of washers at the joint or pivot, there are two
cross shafts upon which is a slide, this slide carries a screwed stud attached to the
polishing rubber frame, by which the rubber frame can be raised or lowered by a
wing nut, or disc through which the stud screws; it will be seen that the rubber
frame has imparted to it a partial rotary motion as well as a cross or right angular
motion, this being in exact imitation of hand polishing, the length of travel of the
table is regulated by altering the position of the stud in the slot of the disc, the
motion of the rubber frame can be regulated by altering the position of the stud
of the connecting rod in the slot of the arm, the polishing rubber holder or frame
for carrying the rubber stones has a separate pivotted frame for each rubber stone,
each frame is connected to a frame on which is a screw, and by turning this screw
one way or the other the angles of the stones may be altered simultaneously, so as
'to bring different points of the rubber stones in contact with the stone being
polished, the rubber is attached to and detached from the screwed stud of the
slide and to and from the connecting rod by an arrangement of spring studs.
For quickly and easily securing the stones to be polished on the table. I employ
bars placed lengthwise the table in recesses, so dispensing with a large amount of
packing.
DESCRIPTION OF DRAWINGS.
Fig. 1. is a front elevation of my invention.
Fig. 2. is a plan of Fig. 1.
Fig. 3. is an end elevation of Fig. 1.
Figs. 4. 5. and 6 shew detached views of rubber frame with rubbers, also forms

page_text: gears into the two racks, the wheel G is carried on the stud of a forked
connecting rod H, the other end of the connecting rod is attached to a stud
J in the slot of the disc K, which is secured on the driving shaft L, on which
is multiple gear M and M¹ N and N¹ also there is an horizontal shaft P at
right angles to the driving shaft L, this shaft drives the vertical shaft R which
operates the rubber frame W or levigator W¹ by means of the disc or arm S and
connecting rod S¹, the disc or arm S having a slot for adjustment of motion, it
being adjustable to suit the different heights of stones to be polished by a series of
washers at the joint or pivot S2; T, T are the two cross shafts upon which is the
slide T, this slide is pivotted and carries a screwed stud U attached to the polishing
rubber frame W or levigator W¹ by which the rubber frame W can be raised or
lowered by the wing nut or disc W2 through which the stud screws, it will be seen
that the rubber frame W has imparted to it a partial rotary motion as well as a
cross or right angular motion, this being in exact imitation of hand polishing, the
length of travel of the table C is regulated by altering the position of the stud J
in the slot of the disc K, the motion of the rubber frame W can be regulated by
altering the position of the stud S2 of the connecting rod S' in the slot of the arm S,
the polishing rubber holder or frame W for carrying the rubber stones has a
separate pivotted frame X for each rubber stone each frame X is connected to
a frame Y on which is a screw Y¹ and by turning this screw one way or the other
the angles of the rubber stones may be altered, simultaneously so as to bring
different points of the rubber stones Y2 in contact with the stone being polished;
the rubber frame is attached to and detached from the screwed stud U of the slide
and to and from the connecting rod S¹ by the arrangement of springs studs X'
and X' shewn on the various Figures.
For quickly and easily securing the stones to be polished on the table I employ
bars placed lengthwise the table in the recesses Z so dispensing with a large
amount of packing.
The before described apparatus is applicable for grinding, polishing, facing and
graining lithographic stones and other suitable material.
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
(1.) The use and employment of the traversing table operated in the manner
and for the purposes shewn and described.
(2.) Adjusting the traverse of the traversing table as shewn and described.
(3.) Imparting to a rubber a partial rotary as well as a cross or lateral motion,
for the purposes shewn and described.
(4.) Adjusting the motion of the rubber as shewn and described.
(5.) Adjusting the connecting rod to suit the varying thicknesses of stone by
means of a series of loose, washers.
(6.) The use and employment of spring studs or pivots for readily attaching and
detaching the rubber to its operating arms or studs..
(7.) Adjusting the angles of the rubbing stones so as, to bring different points to
rub upon the stone being polished, as shewn and described.