Improvements in Apparatus for Driving Machines for Grinding, Polishing, Graining, and otherwise Preparing Stones and Printing Surfaces. MACHINES FOR,SHING,INING AND OTHERWISE PREPARING STONES AND PRINTING SURFACES
Year: 1885

page_text: Improvements in Apparatus for Driving Machines for Grinding,
Polishing, Graining, and otherwise Preparing Stones and
Printing Surfaces.
ALEXANDER HERVEY SEGGIE Broughton Market Edinburgh Scotland Engineer
I do hereby declare the nature of my invention for IMPROVEMENTS IN APPARATUS
FOR DRIVING MACHINES FOR GRINDING, POLISHING, GRAINING AND OTHERWISE
PREPARING STONES AND PRINTING SURFACES to be as follows:-
The application of a friction gear consisting of a disc in combination and in
contact with a friction wheel. This wheel rotates with its spindle, but may be slid
on its spindle by means of a lever or other appliance. By sliding the wheel along
its spindle it is brought nearer to or put further from the centre or axis of the disc
thereby changing the speed of the machine to any degree within the limits of the
dimensions of the disc so as to suit the nature of the work being performed. By
the application of this driving gear a ready means of varying the speed of the
machine is obtained and the machine is rendered practically noiseless.
DL: MAL 1
1007

page_text: Improvements in Apparatus for Driving Machines for Grinding,
Polishing, Graining, and otherwise Preparing Stones and
Printing Surfaces.
-
ALEXANDER HERVEY SEGGIE, Broughton Market, Edinburgh, Scotland, Engineer,
I do hereby declare the nature of my invention for IMPROVEMENTS IN APPARATUS
FOR DRIVING MACHINES FOR GRINDING, POLISHING, GRAINING AND OTHERWISE
'PREPARING STONES AND PRINTING SURFACES, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
The application of friction gear, consisting of a disc in combination and in
contact with a friction driving wheel. The friction wheel is made to rotate with
its spindle, but may be slid endwise, by means of a screw, or lever or other
appliance. By thus sliding the friction wheel along its spindle, it is brought near
to, or put further from the centre, or axis of the disc thereby changing the speed of
the machine to any degree, within the limits of the dimensions of the disc, so as to
suit the nature of the work being performed. By the application of this gear a
ready means of varying, either while in motion or at rest, the speed of the machine
is obtained and the machine is rendered practically noiseless.
The following description explains the nature of the invention with reference
the accompanying drawings.
Fig. 1 is a side elevation and Fig. 2 is an end elevation, shewing my improved
apparatus.
A is a cast iron disc, mounted on B, the upright shaft of the machine, and is in
combination and in contact with a friction wheel C, mounted on the spindle D, on
which the fast and loose pulleys are mounted.
The friction wheel C, although compelled to revolve on its own spindle D, by
means of a feather E, is capable of being slid endwise thereon to any degree in
relation to the disc A, within the limits of the dimensions of the disc, by means of
a screw F. formed on a shaft G. on which a hand wheel H., as shewn, or a chain
wheel is fixed.
The shaft G. on which the screw F. is formed is carried on bearings cast on frame
of grinding machine and the screw F. acts on a fork K working in the grooved
boss of the friction wheel C.
By turning the screw shaft G F in the one or the other direction, the friction
wheel is moved nearer to or further from the centre of the disc and the speed of
the machine is thereby changed to any extent, within the limits referred to.
By this arrangement of gear the machine is rendered practically noiseless and
a more than ordinarily compact means of varying the speed of the machine
indefinitely, is obtained.

page_text: 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 application of friction apparatus for driving and varying the speeds of
5 machines for, grinding, polishing graining and otherwise preparing stones and
printing surfaces.