LITHOGRAPHIC MACHINES
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said George Newsum at the Office
of the Commissioners of Patents on the 3rd January 1881.
GEORGE NEWSUM, of Leeds, in the County of York.
LITHOGRAPHIC MACHINES."
"IMPROVEMENTS IN
The object of my improvements is to enable lithographic machines to be worked
at a much higher speed than hitherto with perfect safety and steadiness.
These improvements are applied in connection with the table or carriage for the
purpose of preventing strain that would otherwise occur on the driving gearing of
the machine, caused by the sudden check at each end of the stroke or traverse of.
the table, and for this purpose I provide springs or buffers at ends of the machine
to cushion the table or carriage at the extremity of its forward movements, and at
the same time to assist in the return movement thereof.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Newsum in the Great Seal Patent Office on the 2nd July
1881.
GEORGE NEWSUM, of Leeds, in the County of York.
ITHAAD
MAGTESTING"
"
IMPROVEMENTS IN

page_text: These improvements are applied in connection with the table or carriage for the
purpose of preventing strain that would otherwise occur on the driving gearing
of the machine, caused by the sudden check at each end of the stroke or traverse of
the table, and for this purpose I provide springs or buffers at ends of the machine
to cushion the table or carriage at the extremity of its forward movement, and at
the same time to assist in the return movement thereof.
And in order that my Invention may be more completely understood, reference
is given to the accompanying Drawings and to the letters and marks thereon.
Fig. 1.
a is the framework of the machine; b, the cylinder; c, the table; d, the driving
gear, and 6, the supporting wheels for the table, all of which are of ordinary
construction.
In order to prevent the strain that would otherwise occur on the driving gear d
of the machine caused by the sudden check at each end of the stroke or traverse of
the table c, I provide the springs or buffers f which are attached to the brackets g
on the framework a; each spring f may be adjusted by means of the set screw g¹.
The springs operate direct upon the levers h. On the table c are provided the
projecting pieces or runners i; these prior to the completion of the stroke come in
contract with the levers h, which levers by the assistance of the springs act upon
the table in such a manner as to form a cushion at each end of the stroke, whereby
the jerk or strain which usually takes place upon the gearing is prevented, at the
same time assistance is given to the return motion of the table.
Instead of the springs shown in Drawing, coiled or ordinary buffer springs may
be employed.
Having now described the nature of my said Invention, and described with the
aid of Drawings how the same may be carried into practice, I would have it
understood that I do not limit myself to the precise details or configuration of
the parts I have described and shewn, as the same may be varied or modified
without departing from the nature of my said Invention, but what I do claim
is,―
The arrangements and application of springs for spring buffers and parts
connected therewith, with mere modification of the same for cushioning the table
or carriage c, substantially as and for purposes herein set forth.
In witness whereof, I, the said George Newsum, have hereunto set my hand
and seal, this Thirtieth day of June, in the year of our Lord One thousand
eight hundred and eighty one.
Witness to the signature of the
Baid George Newsum,
J. W. HARDING,
Engineer and Patent Agent,
2, East Parade,
Leeds.
G. NEWSUM. (L.S.)