IMPROVEMENTS IN PRINTING MACHINES "
Year: 1883

page_text: LETTERS PATENT to Alfred Coates of Love Clough Rawtenstall in the County
of Lancaster Engineer for an Invention of "IMPROVEMENTS IN PRINTING
MACHINES "
PROVISIONAL SPECIFICATION left by the said Alfred Coates at the Office
of the Commissioners of Patents on the 25th January 1883.
ALFRED COATES of Love Clough, Rawtenstall in the County of Lancaster
Engineer IMPROVEMENTS IN PRINTING MACHINES
The object of my invention is to enable a workman to set or pitch printing
rollers more expeditiously and with greater facility than hitherto
In performing my invention I employ a face worm wheel and worm (instead
of the ordinary set screw, or worm wheel and worm) to actuate the boss fixed on
the printing roller or mandrel-The face worm wheel is secured to the printing
roller or mandrel by a feather key in the ordinary manner, and is fitted loosely
into the spur or box wheel-A worm is held in brackets attached to a large washer
or ring which is fastened to the face of the spur or box wheel; this washer or
ring may cover the face worm wheel, and it holds the worm and wheel in gear-
The worin may be moved in the ordinary manner to adjust the pitch or position
of the printing roller or mandrel.
The disadvantage of the ordinary set screw is that it has but little range, and
soon wears slack-The ordinary worm wheel, as hitherto constructed, is necessarily
of very small diameter, and consequently is difficult to move-By my, improve-
ments I am enabled to increase the diameter of the worm wheel, and thus obtain
greater power and leverage, thereby facilitating the setting or adjusting of the
printing rollers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alfred Coates in the Great Seal Patent Office on the 23rd July
1883.
ALFRED COATES, of Love Clough, Rawtenstall in the County of Lancaster
Engineer. "IMPROVEMENTS IN PRINTING MACHINES
"
The object of my Invention is to enable a workman to set or pitch printing
rollers more expeditiously and with greater facility than hitherto.
In performing my Invention I employ a face worm wheel and worm (instead of
the ordinary set screw or worm wheel and worm) to actuate the boss fixed on the
printing roller or mandrel. The face worm wheel is secured to the printing roller
or mandrel by a feather key in the ordinary manner and is fitted loosely into the
spur or box wheel: a worm is held in brackets attached to a large washer or ring
which is fastened to the face of the spur or box wheel: this washer or ring may
cover the face worm wheel and it holds the worm and wheel in gear. The worm
may be moved in the ordinary manner to adjust the pitch or position of the
printing roller or mandrel.
The disadvantage of the ordinary set screw is that it has but little range and
soon wears slack. The ordinary worm wheel as hitherto constructed is necessarily
of very small diameter and consequently is difficult to move.
By my Improvements I am enabled to increase the diameter of the worm wheel
and thus obtain greater power and leverage thereby facilitating the setting or
adjusting of the printing rollers.
And in order that my Invention may be fully understood and readily carried
into operation I will proceed to describe the accompanying Sheet of Drawings
reference being had to the figures and letters marked thereon.
Fig. 1 is a front elevation and Fig. 2 a side view in section of my improvements
applied to a printing roller or mandrel in which
a is the boss fitted on the printing roller or mandrel and secured to it by the
set screw a¹ or with a cotter in the ordinary manner: b is the spur or box wheel
which in conjunction with the ring or washer e embraces the boss a: the face
worm wheel c is fitted loosely in a space formed between the box wheel b and
boss a and is secured to the boss a in any convenient manner. A worm d
which gears into the face wheel c is held in brackets & formed with or attached
to the ring or washer e which is fastened to the box wheel b by the bolts or
screws e¹ the worm d has holes d' into which a lever is inserted in order to turn
the worm.
When it is required to set or adjust the printing roller.-the worm d is moved
by a lever or wrench or in any convenient manner so as to turn the face worm
wheel c fastened to the boss a in the direction necessary to bring the printing
roller into the desired position.-When this is done the printing roller is driven by
the box wheel b as usual.
By the arrangement described I am able to employ a powerful face worm wheel
and worm for adjusting the pitch or position of printing rollers in place of the
ordinary set screw or worm wheel and worm which are necessarily of small
diameter and nower.

page_text: Having stated the nature of my Invention and described a convenient manner
of carrying the same into effect
I declare that I claim.
Setting or pitching the rollers of printing machines by means of a face worm
wheel and worm substantially as herein shown and described.
In witness whereof I the said Alfred Coates have hereunto set my hand and
seal this twentieth day of July One thousand eight hundred and eighty three.
ALFRED COATES (L.S.)