IMPROVEMENTS IN MEANS OR APPARATUS FOR DRIVING PROVISIONAL SPECIFICATIONIVING MACHINES FOR LITHOGRAPHIC AND LETTER-PRESS PRINTING
Year: 1874

page_text: LETTERS PATENT to John Ward, of the Firm of Marcus, Ward, and
Company, of Belfast, in the County of Antrim, Ireland, for the
Invention of "IMPROVEMENTS IN MEANS OR APPARATUS FOR DRIVING
PROVISIONAL SPECIFICATION left by the said John Ward at the
Office of the Commissioners of Patents, with his Petition, on the
16th December 1874.
I, JOHN WARD, of the Firm of Marcus, Ward, and Company, of
Belfast, in the County of Antrim, Ireland, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN MEANS OR APPARATUS
FOR DRIVING MACHINES FOR LITHOGRAPHIC AND LETTER-PRESS PRINTING," to be as
follows:-
-
The Invention has for its object improvements in means or apparatus
for driving machines for lithographic and letterpress printing, so as to
enable the speed of such machines to be readily and speedily varied
whilst in motion to any degree between the minimum and maximum at

page_text: which the apparatus is set. For this purpose I employ friction apparatus
consisting of a disc mounted on the end of the driving shaft of the
machine in combination with a friction wheel mounted on an axis or
shaft, on which the fast and loose pulleys are mounted. This friction
wheel although compelled to revolve with its shaft or axis is capable of
being shifted endwise thereon to any degree in relation to the disc by
means of a screw formed on a shaft or axis, on which a hand wheel is
fixed, such shaft or axis being mounted in bearings firmly fixed to the
printing machine frame.
By turning the screwed shaft or axis in the one or the other direction
the friction pulley can be moved nearer to or further from the axis of
the disc, and the speed of the machine can be thereby almost instan-
taneously changed to any extent within certain limits, so as to adapt the
speed to the nature of the job.
By this arrangement of driving gear the driving is more steady, and
the driving gear is more compact than the ordinary means of obtaining
varying speeds, whilst it is much less liable to get out of order, and the
working of the machine does not require to be interrupted whilst
changing the speed.
By the aid of this Invention the machines can be instantaneously
stopped without the use of a break, and they can be set lengthwise to
the driving shaft, which is an obvious advantage in large machine
rooms.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Ward in the Great Seal Patent Office 2
on the 15th June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
WARD, of the Firm of Marcus, Ward, and Company, of Belfast, in the
County of Antrim, Ireland, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 30
Letters Patent, bearing date the Sixteenth day of December, in the year
of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John Ward, Her special

page_text: license that I, the said John Ward, my executors, administrators,
and assigns, or such others as I, the said John Ward, 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 "IMPROVE-
MENTS IN MEANS OR APPARATUS FOR DRIVING MACHINES FOR LITHOGRAPHIC
LETTER-PRESS PRINTING," upon the condition (amongst others)
that I, the said John Ward, my executors or administrators, by
an instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain 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
AND
Toto Datant

page_text: Figure 1 is a front view, Figure 2 is a plan, and Figure 3 is an end
view representing my improved means or apparatus for driving machines
for lithographic and letter-press printing.
In communicating motion to these classes of machines it is highly i
important that the driving mechanism be so arranged that the speed of
such machines may be readily and speedily varied whilst in motion to
any degree between the minimum and maximum at which the apparatus
is set. This I effect in the following manner:-I employ friction
apparatus consisting of a disc A mounted on the end of the driving
shaft a of the machine in combination with a friction wheel B' mounted
on an axis or shaft B, on which the fast and loose pulleys are mounted.
This friction wheel B' although compelled to revolve with its shaft or
axis by means of a feather B' is capable of being shifted endwise thereon
to any degree in relation to the disc A by means of a screw C¹ formed
on a shaft or axis C, on which a hand wheel C is fixed. The shaft or
axis C is mounted in bearings D fixed to the printing machine frame,
and the screw C' acts upon a fork or clutch C³ working in connection
with the grooved boss of the friction wheel B¹.
By turning the screwed shaft or axis in the one or the other direction
the friction pulley can be moved nearer to or further from the axis of
the disc, and the speed of the machine can be thereby almost instan-
taneously changed to any extent within certain limits so as to adapt the
speed to the nature of the job.
By this arrangement of driving gear the driving is more steady, and
the driving gear is more compact than the ordinary means of obtaining
varying speeds, whilst it is much less liable to get out of order, and the
working of the machine does not require to be interrupted whilst
changing the speed.
By the aid of this Invention the machines can be instantaneously
stopped without the use of a break, and they can be set lengthwise to
the driving shaft, which is an obvious advantage in large machine
rooms.
It is evident that instead of employing a screw as above described to
shift the friction wheel on its shaft a lever may be employed.

page_text: Having thus described the nature of my said Invention, and the modo
in which I carry the same into effect, I would have it understood that
what I claim is, the employment of friction apparatus for driving
machines for lithographic and letter-press printing arranged and operated
in manner substantially as herein shown and described.
In witness whereof, I, the said John Ward, have hereunto set
my hand and seal, this Tenth day of June, in the year of
Lord One thousand eight hundred and seventy-five.