IMPROVEMENTS IN EXPANDING PULLEYS AND IN THE APPLI- CATION OF THE SAME TO PAPER CUTTING MACHINERY
Year: 1884

page_text: the same to Paper Cutting Machinery.
}
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for "IMPROVEMENTS IN EXPANDING PULLEYS AND IN THE APPLI-
CATION OF THE SAME TO PAPER CUTTING MACHINERY". to be as follows:-
•
This invention has for its object to provide improved expanding pulleys
especially adapted for paper-cutting machinery, and other mechanism in which it
is desirable to change the relative speed of two shafts connected by a belt through
which motion is communicated from one shaft to the other.
The said invention comprises a pulley composed of two parts or sections each of
which is a frustum of a cone having longitudinal slots separating its periphery
into fingers, and slots in its base or larger end to receive the fingers of the other
section, the fingers of one section coinciding with the slots of the other section, so
that the two sections can be telescoped or moved into or out of each other, thus
varying the diameter of the belt-supporting portion of the pulley, that is to say,
the point where the peripheries of the two sections intersect.
The invention also comprises means for moving said sections simultaneously in
opposite directions to vary the diameter of the belt-supporting portion, all as
hereinafter described.
The improved expanding pulley is composed of two sections, each of which is
frusto-conical in shape and is slotted longitudinally, the tapering peripheries of the
sections being thus converted into fingers, separated by open spaces.
The said
fingers are rigidly connected to the base or larger end of each section, which is
provided with a central tapped boss or nut, the nut of the one section having left
band threads while the nut of the other section has right hand threads.
The shaft upon which the improved pulley is supported passes through said-
nuts, and is provided with right and left hand screw-threads corresponding with
those of the nuts, so that when the shaft is rotated and the sections of the pulley
are prevented from rotating, the two sections will be moved simultaneously in
opposite directions by the right and left screw-threads.
The two sections are placed on the threaded shaft with the fingers of the one
section entering the slots of the other, thus forming a double cone pulley having
its sinallest diameter midway between its ends, where the peripheries of the two
parts intersect. ·

page_text: .
The larger ends or bases of the sections are provided with slots which coincide
with the slots in the peripheries of the sections, the slots of each section end or.
base receiving the fingers of the other section when the two sections are telescoped
as hereinafter described.
It will be understood that when the sections are moved inwardly on the shaft
or toward each other the diameter at the intersecting point will be increased, and
when the sections are moved outwardly on the shaft, said diameters will be
decreased.
The diameter of the belt-supporting surface of the pulley will thus be varied in
proportion to the movement of the sections, which may be telescoped or moved
inwardly until their larger ends almost meet the fingers of each section projecting
through the slotted bases of the other section thus presenting the largest possible
central diameter; or be separated until the smaller ends are almost separated and
the smallest possible central diameter is presented. The shaft is provided with
jam nuts to hold the sections at any points to which they may be adjusted on the
shaft.
0
The operation of the pulleys, as applied to a paper-cutting machine, is as follows,
that is to say-The paper to be cut into sheets of a required length is in rolls
on mandrels, which are placed in bearings in the frame of the machine. The
paper is first passed over a roll, said roll being rotated by a large gear wheel
attached to its shaft and meshing with a pinion attached to a main shaft having
one of the improved pulleys, said shaft having a pulley at one end on which runs
a driving belt which rotates the said main shaft, and the roll, at a uniform rate.
From the roll the paper passes between a fixed knife and a revolving knife
whereby the web of paper is severed into sheets; said knives being of the usual
construction.
The revolving knife is secured to two heads affixed to an arbor having at one
end a gear-wheel meshing. with a pinion on a second shaft provided with an
improved pulley which is connected by a belt with the pulley on the main shaft,
which imparts motion to the roll. At each revolution of the knife a sheet is cut
from the web, corresponding in length to the rapidity of rotation of said knife,
the paper always passing to the knife at a uniform rate of speed under all
circumstances.
When desirable to alter the length of the sheet of paper the speed of the
revolving knife is varied as follows; that is to say -If a longer sheet is to be cut,
the sections of the pulley that is situated on the second shaft which communicates
motion to the revolving knife, are moved towards and into each other until the
belt-supporting diameter is enlarged sufficiently, and at the same time; the sections
of the pulley on the main shaft are moved from each other in the same ratio.
This operation causes the cutting knife to rotate slowly and causes a longer sbeet
of paper to be cut off.
The operation is reversed when a shorter sheet of paper is required, thus causing
the 'cutting knife to rotate at an increased velocity and form shorter sheets.
I do not limit myself to the application of my improved pulleys to paper cutting
machines, as they may be used for any of the purposes to which expanding or
differential pulleys are applicable.
. Other means may be used for adjusting the sections of the pulley, besides the
right and left hand threaded shaft, without departing from the nature of the
invention.

page_text: Improvements in Expanding Pulleys and in, the Application of
the same to Paper-cutting Machinery.
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for "IMPROVEMENTS
IN
EXPANDING PULLEYS, AND IN' THE
APPLICATION OF THE SAME TO PAPER-CUTTING MACHINERY" and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
This invention has for its object to provide an improved expanding pulley
especially adapted for paper-cutting machinery and other mechanism in which it
is desirable to change the relative speeds of two shafts connected by a belt through
which motion is communicated from one shaft to the other.
The invention also relates to machinery for cutting a web of paper into sheets,
and has for its object to provide mechanism for rotating the roll that feeds the
web of paper forward, and the revolving knife that cuts the paper into sheets.
The invention consists in a pulley composed of two parts or sections, each of
which is a frustum of a cone, having longitudinal slots separating its periphery
into fingers, and slots in its base or larger end to receive the fingers of the other
section, the fingers of one section coinciding with the slots of the other section, so
that the two sections can be telescoped or moved into or out of each other, thus
varying the diameter of the belt-supporting portion of the pulley, viz:—the point
where the peripheries of the two sections intersect.
The invention also consists in the combination with the feed roll and revolving
knife, of a shaft geared directly to the arbor of the feed roll, and another shaft
geared directly to the arbor of the revolving knife, expanding pulleys on said shafts
and a belt connecting said pulleys; the shaft geared to the feed roll being driven
by a prime motor, and imparting motion to the other shaft which in turn revolves
the knife, the relative speeds of the knife and feed roll being governed by the
expanding pulleys, all of which I will now proceed to describe.
In the accompanying drawing
Figure 1 represents a side elevation of a paper cutting machine provided with
my improvements.
Figure 2 represents a front elevation of the same.
Figure 3 represents a front elevation showing, different means for operating the
expanding pulleys, the cutting mechanism being omitted for clearness.
The same letters of reference indicate the same parts in all the figures.
represents the supporting frame of the machine having bearings for one or
more mandrils on which are wound webs of paper to be cut.
g represents the feed roll journalled in the frame f, and having on its arbor a
large gear wheel r, and c is a shaft provided with an expanding pulley P, and
with a pinion s, which meshes with the gear-r.
The shaft c has a pulley i at one end, on which runs a driving belt j, which
rotates the shaft c, and roll g, at a uniform rate. From the roll g, the paper passes

page_text: between a fixed knife k, and a revolving knife l, whereby the web of paper is
severed into sheets, said knives being of the usual construction.
The revolving knife is secured to two heads m, m affixed to the arbor n, having
at one end a gear wheel o meshing with a pinion p on a second shaft c¹, which
shaft has another expanding pulley P¹ which is connected by a belt q, with the
pulley on the shaft c. At each revolution of the knife l, a sheet is cut corre-
sponding in length to the rapidity of the rotation of said knife, the paper always
passing to the knife at a uniform rate of speed.
The expanding pulleys P and P¹ are each preferably composed of two sections
a, a each of which is frusto-conical in shape, and is slotted longitudinally the
tapering peripheries of the sections being thus converted into fingers separated by
open spaces.
The fingers are rigidly connected to the base or larger end of each section, which
may be provided with a central tapped boss or nut b, the nut of the one section
having left hand threads, while the nut of the other section has right hand threads.
The shaft upon which the pulley is supported, passes through said nuts, and is
provided with right and left hånd screw threads corresponding with those of the
nuts, so that when the shaft is rotated and the sections of the pulley are prevented
from rotating, the two sections will be moved simultaneously in opposite directions
by the right and left screw threads.
The sections a, a, are placed on a threaded shaft with the fingers of the one
section entering the slots of the other, thus forming a double cone pulley having
its smallest diameter midway between its ends where the peripheries of the two
parts intersect. The larger ends or bases of the sections are provided with slots 8¹
(Figure 1) which coincide with the slots in the peripheries of the sections, the
· slots s¹ of each section end or base receiving the fingers of the other section when
the two sections are telescoped as hereinafter described. It will be seen that when
the two sections a, a are moved inwardly on the shaft or toward each other the
diameter at the intersecting point will be increased, and when the sections are
moved outwardly on the shaft said diameters will be decreased, so that the
diameter of the belt supporting surface of the pulley will be varied in proportion
to the movement of the sections, which may be telescoped or moved inwardly until
their larger ends almost meet, the fingers of each section projecting through the
slotted bases of the other section, as shown at the lower portion of Figure 2, thus
presenting the largest possible central diameter; or the sections may be separated
as shown at the upper portion of Figure 2, until the smaller ends are almost
separated and are of the smallest possible central diameter. The shaft c is provided
with jai-nuts d, d to hold the sections at any points to which they may be
adjusted on the shaft.
When desirable to alter the length of a sheet of paper, the speed of the revolving
knife is varied as follows:-if a longer sheet is to be cut, the sections of the
pulley P that are situated on the shaft c¹ are moved toward and into each other
until the belt supporting diameter is enlarged sufficiently, and at the same time the
sections of the pulley on the other shaft c are moved from each other in the same
ratio. This operation causes the cutting knife to rotate slowly, and causes a longer
sheet of paper to be cut off. The operation is reversed when a shorter sheet of
paper is required, thus causing the cutting knife to rotate at an increased velocity,
and form shorter sheets.
•
I do not limit myself to the use of pulleys of the described construction, but may
use any form of expanding pulley that can be mounted and adjusted on the shafts
c and c¹.
Nor do I limit myself to the application of the described pulleys to paper cutting
machines, as they may be used for any of the purposes to which expanding or
differential pulleys are applicable.
.
It will be seen that the employment of the two shafts c, c¹ geared directly to
the feed roll and knife arbors, and provided with expanding pulleys, enables motion
to be communicated from the feed roll to the knife through one belt only, thus

page_text: reducing the liability of accidental variation between the movement of the feed roll
and knife caused by the slipping of belts, to the minimum and making the
mechanism simple and compact.
Other means other than those above described may be used for adjusting the
sections of the pulleys.
In Figure 3 I have shown the sections a, a, of the pulleys provided with
hubs A, A, adapted to slide on the arbors 'c, c¹ but engaged with said arbors by
grooves and feathers or otherwise so as to rotate with said arbors, each section
being fixed to a hub A, instead of to a nut b as before described.
The hubs A, A on the arbor c are connected to those on the arbor c¹ by
levers D, D, pivotted at E, E to fixed supports between the two arbors, the
hubs A, A, having collars F, F, which are engaged with the hubs so as to move
lengthwise with them and permit the hubs to rotate independently of the collars.
The collars F F have trunnions which enter slots in the forked ends of the
levers D; D.
•
G represents a shaft journalled in the frame F and having right and left hand.
screw threads at 2, 2, said threads engaging with correspondingly threaded
nuts H, H adapted to slide on the levers D D sufficiently to compensate for the
oscillating movements of said levers on their pivots.
The shaft G has a crank whereby it may be rotated.
It will be seen that when the shaft is rotated its right and left hand threads
will cause the levers D D, to swing in opposite directions on their pivots, and
thus move the sections of one pulley outwardly, and the sections of the other
pulley inwardly.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed as communicated to
me by my Foreign Correspondent, I declare that what I claim is
First. An expanding pulley composed of two oppositely tapered sections, each
having its periphery slotted to form longitudinal fingers, and its base or larger. end
slotted to receive the fingers on the other section, the fingers of the one section
coinciding with the slots in the periphery and base of the other, as set forth.
Second. The combination of the two oppositely tapered slotted sections, the one
having a right-hand and the other a left-hand nut; and a supporting-shaft having
right and left hand threads engaging with said nuts, as set forth.
Third. The combination of the two oppositely tapered-slotted sections, having
the oppositely threaded nuts, the right and left-hand threaded shaft engaged. with
said nuts, and the jam-nuts d d whereby the sections are secured wherever they
may be adjusted.
Fourth. In a paper cutting machine, the feed roll and revolving knife having
gears affixed to their arbors, combined with the shaft c c¹ geared respectively to
the feed roll and to the rotary knife, and provided with expanding pulleys
connected by a belt, as set forth.
Fifth. The combination with the pulleys composed of the sections a, a, the.
arbors c c on which said sections are free to slide, the levers D D engaged with
the hubs of said sections, and means substantially as described for swinging said
levers in opposite directions; as set forth.