Improvements in Driving Gear for Paper-making and similar Machines.
Year: 1896

page_text: Date of Application, 7th Mar., 1896
Complete Specification Left. 5th Dec. 1896-Accented. 6th Mar.. 1897
PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Paper-making and similar
Machines.
I, JOHN WHITE, of the Firm of James Bertram and Son, (Limited), Leith
Walk Foundry, in the City of Edinburgh, Engineer, do hereby declare the nature
of this invention to be as follows:-
This invention relates to driving gear for transmitting movement to the several
roll shafts or sections of paper making and similar machines in which it is
desirable that stoppages and slight variations from the normal speed of any of
the several shafts or sections should be allowed for without interference with.
the others.
Hitherto this object has been imperfectly attained by the use of what has been
known as the "French train" or "Marshall train of driving gear. My invention
has been designed as an improvement ou that class of driving gear; and it has
for its objects chiefly to simplify the driving gear and render it more generally
efficient and better adapted for the working conditions, whilst effecting a large
saving of the space usually occupied by the driving gear.
Under the invention I employ by preference ropes or bands or a single rope or
band instead of the usual main driving shaft for driving the whole of the counter
shafts from which motion is transmitted to the roll shafts of the several sections,
and from the counter shafts I drive by means of open or crossed belts and cone
pulleys intermediate shafts geared by spur gearing to the roll shafts the inter-
mediate shafts being adjustable and each adapted to be swung or moved towards
or away from the corresponding counter shaft so that the driving bands over the
cone pulleys may be slackened or tightened to stop or restart any section of the
machine without interfering with other sections.
The intermediate shaft for each section of the machine is fitted in bearings in a
framing, which may conveniently be made of rectangular open form, the framing
being carried so as to be free to rock or swing upon trunnions whose axis coincides
or is in line with that of the roll shaft to be driven. The roll shaft which is
connected by a coupling to the roll has on it a spur wheel in gear with and driven
by a spur pinion on the intermediate shaft, the gearing being placed within the
framing in one of whose trunnions the roll shaft is carried. As the framing carries
the bearings of the intermediate shaft the spur gear will always mesh or remain in
proper gear when the framing is turned or swung upon its trunnion bearings. On
the intermediate shaft is a cone pulley which is driven by a belt or band from
a cone pulley on the counter shaft driven by the main driving rope or band which
is carried over or under pulleys on the series of counter shafts provided for the
several sections of the machine, the driving rope or band being preferably strung
between the pulleys i.e. carried alternately over and under them so as to ensure
sufficient bite on the pulleys, and the proper direction of motion of the roll shafts
being obtained by using open or cross belts on the cone pulleys.
The slackening or tightening of the belt passing over the cone pulleys of each
section in order to stop or restart the roll shaft is effected by swinging the framing
carrying the intermediate shaft so as to bring the cone pulleys more or less close.
to each other. For this purpose the framing is connected by a link or rod to a

page_text: crank or eccentric below and which is turned or controlled from the front of the
machine by rods and levers or other gear. The length of the connecting rod is
adjustable by right and left hand screws or like means to apply more or less tension
on the belt, and adjustable stops are provided upon which the framing rests when
it is drawn down by the crank to stent the belt.
The length of the driving belt is so adjusted that when the crank is in its lowest
position and the framing is bearing hard on the stops the belt is sufficiently tight
on the cone pulleys to drive the intermediate shaft; but when the crank is turned
to its highest position the tension on the belt being relieved it will simply run on
the top cone and cease driving the intermediate shaft and roll shaft.
Instead of carrying the intermediate shaft which drives the roll shaft upon a
swinging or movable framing as described the counter shaft above may be carried
on a swinging or movable bracket or movable bearings.
By the arrangements described for slackening the driving belt or band to stop
or throw any section of the machine out of gear, the tension on the driving belts
is relieved while any section is at rest; and the tension on the driving belts for
all the sections may be relieved when the whole machine is stopped at week ends
or on holidays and the life of the belts thus prolonged, whilst further advantages
gained are that any of the belts may be stented while the machine is at work, and
the use of the objectionable friction clutch for starting or stopping any section is
dispensed with.
Dated this 6th day of March 1896.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.
Improvements in Driving Gear for Paper-making and similar
Machines.
I, JOHN WHITE, of the Firm of James Bertram and Son, (Limited), Leith
Walk Foundry, in the City of Edinburgh, 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 :-
This invention relates to driving gear for transmitting movement to the several
roll shafts or sections of paper making and similar machines in which it is
desirable that stoppages and slight variations from the normal speed of any
of the several shafts or sections should be allowed for without interference with
the others.
Hitherto this object has been imperfectly attained by the use of what has been
known as the French train" or "Marshall train" of driving gear. My invention
has been designed as an improvement on that class of driving gear; and it has
for its objects chiefly to simplify the driving gear and render it more generally
efficient and better adapted for the working conditions, whilst effecting a large
saving of the space usually occupied by the driving gear. "
The invention is illustrated by the accompanying drawings,
Fig. 1 of which is a front elevation, Fig. 2 an end elevation and Fig. 3 a
view similar to Fig. 1, but showing the cone pulleys in a different relative
position.
Fig. 4 is a side elevation of part of the driving gear under a slightly modified
form and Fig. 5 is a plan of the same.
Under the invention I employ by preference ropes, bands or chains or a single

page_text: rope, hand or chain A instead of the usual main driving shaft for driving the
whole of the counter shafts B, said rope A being preferably carried alternately
over and under the pulleys on the series of counter shafts provided for the several
sections; or I may key suitable cranks on the ends of the shaft B and couple two-
or more of them by means of suitable connecting rods, whereby motion is trans-
mitted to the roll shafts C of the several sections; and from each of the counter
shafts B I drive by means of open or crossed belts D and a cone pulley E an
intermediate shaft F cn which a cone pulley G is fixed, said shaft being geared by
spur gearing to the roll shaft C, each intermediate shaft F being adjustable and
adapted to be swung or moved towards or away from the corresponding counter
shaft B so that the driving band D over the cone pulleys may be slackened or
tightened to stop or restart any section of the machine without interfering with
other sections. I may also make the shaft B drive two or more of the several
sections by keying the requisite number of cone pulleys E on the shaft B.
The intermediate shaft F for each section of the machine is fitted in bearings I
in a framing J, which may conveniently be made of rectangular open form, the
framing J being carried so as to be free to rock or swing upon trunnions whose
axis coincides or is in line with that of the roll shaft C to be driven; or said roll
shaft may form the trunnious for the framing which in either ease are carried in
hearings L on the sole or bed of the framing M which carries the several shafts.
The roll shaft C, which is connected by a coupling C to the roll has on it a spur
wheel H in gear with and driven by a spur pinion K on the intermediate shaft F
the gearing being placed within the framing J. As the framing J carries the
bearings I of the intermediate shaft F the spur gear H, K, will always mesh or
remain in proper gear when the framing J is turned or swung upon its trunnion
bearings L.
The slackening or tightening of the belt D passing over the cone pulleys E, G,
of each section, in order to stop or restart the roll shaft C is effected by swinging
the framing J carrying the intermediate shaft F so as to bring the cone pulleys.
more or less close to each other as shown particularly at Fig. 3. For this purpose
the framing J is connected by a link or rod N to a crank or eccentric O below,
and which is turned or controlled from the front of the machine by rods and levers
or other gear. The length of the connecting rod is adjustable by right and left.
hand screws or like means to apply more or less tension on the belt D, and
adjustable stops are provided upon which the framing rests when it is drawn down.
by the crank O to stent the belt.
The length of the driving helt D is so adjusted that when the crank is in its.
lowest position and the framing is bearing hard on the stops the belt is sufficiently
tight on the cone pulleys E, G, to drive the intermediate shaft F but when the
shaft is turned to its highest position as shown at Fig. 3 the tension on the helt D
being relieved it will simply run on the top cone E and cease driving the
intermediate shalt F and roll shaft C.
In the modification illustrated by Figs. 4 and 5 the pivoted framing J, for
carrying the shaft F, bevel wheel P and belt pulley G, is supported by two
trunnions one of which is bushed to form a bearing for the roll shaft C, the
trunnions being carried in brackets Q on a block R secured to the floor. Stops S
are provided to retain the framing in a horizontal position, viz., when the belt D
is stented to drive that particular section. This modification is applicable to the
usual "Marshall's train" and the main driving shaft would be directly or
approximately over the spindle of each section.
It will be obvious that instead of the intermediate shaft which drives the
roll shaft being carried upon a swinging or movable framing as described the
counter shaft above may be carried on the swinging or movable bracket or
movable bearings.
By the arrangements described for slackening the driving belt or band to stop
or throw any section of the machine out of gear, the tension on the driving belts
is relieved while any section is at rest; and the tension of the driving belts tor

page_text: all the sections may be relieved when the whole machine is stopped at week ends
or on holidays, and the life of the belt is thus prolonged, whilst further
advantages gained are that any of the belts may be stented while the machine is
at work, and the use of the objectionable friction clutch for starting or stopping
any section is dispensed with.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In papermaking and similar machines driving gear constructed and arranged
to operate substantially as described.
2. The combination with driving gear for papermaking and similar machines of
a frame arranged to swing upon a pivot or axis and to carry one of the driving
shafts and means for actuating or adjusting said swinging frame for the purpose of
stenting and slackening the driving belt on the pulley of said driving shaft
substantially as described.
3. The combination with the driving gear for papermaking and similar machines
of a swinging frame arranged to carry the intermediate driving shaft and adapted
to swing or oscillate from the axis of the driven roll shaft with which the driving
shaft gears, and means for swinging or adjusting the said frame for the purpose of
stenting and slackening the driving belt on the pulley of said driving shaft
substantially as described.
4. In driving gear for papermaking and similar machines the combination
with the roll shaft and a driving shaft geared thereto, of a swinging frame centred
on the axis of the roll shaft and carrying the driving shaft so as to maintain the
spur wheels in gear, and means such as a crank or eccentric and connecting rod
for actuating the swinging frame to stent and slacken the driving belt on the
driving shaft pulley substantially as described.
5. In driving gear for paper making and similar machines the combination with
the driving shafts B, F, carrying the cone belt pulleys E, G, and belt D, of the
swinging frame J pivoted on the roll shaft C and carrying the shaft F geared
to the roll shaft, and means such as the eccentric O and connecting rod N for
actuating or adjusting the said swinging frame for the purpose of stenting and
slackening the driving belt D substantially as described.
Dated this 4th day of December 1896.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62 St. Vincent Street, Glasgow, Agent for the Applicant.