Improvements in Gearing for Contiguous Rollers, Shafts, and Spindles.
Year: 1897

page_text: Date of Application, 18th June, 1897-Accepted, 7th Aug., 1897
COMPLETE SPECIFICATION.
Improvements in Gearing for Contiguous Rollers, Shafts, and
Spindles.
We, HENRY SIMON of 20 Mount Street Manchester in the county of Lancaster,
Engineer, and SIDNEY LEETHAM of Hungate Mills, in the city and county of York,
Miller, 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 the intergearing of contiguous rollers shafts and
spindles in cases where the difference of speeds is greater than can be conveniently
arranged by means of the ordinary spur and similar gearing.
For the purpose of our Invention we employ special positive gearing which may
be variously arranged and proportioned to meet the needs of each case. This
gearing consists of a tangent screw or worm on the shaft or spindle which has the
higher speed gearing with a worm wheel mounted upon an intermediate shaft
which may be at an angle to or parallel with the line of centres, and gearing
between the intermediate shaft and the driven roller or shaft.
We will more particularly describe our said Invention with reference to the
accompanying drawings.
As represented in end elevation by Figure 1, A shews the spindle of a roller or
the end or cross section of a shaft running at a comparatively high speed and B,
a similar spindle or shaft running at a very much lower speed and being driven
from A. Upon A there is fixed the tangent screw or worm C, which gears with the
worm wheel D, fixed upon the shaft E. In this case this intermediate shaft is
mounted at an angle to the line joining the centres A and B, and is carried in
suitable bearings such as F F¹, which may be conveniently formed respectively
on the two fixings G G¹, one of which is centred on the shaft A and the other on
the shaft B. There is also fixed on the intermediate shaft E, a worm or tangent
screw H, gearing with the worm wheel I on the shaft B. By varying the pitches
and diameters of the worms and worm wheels, the ratio of the speeds may be
varied within very wide limits.
In the case of the gearing being employed in connection with rollers running
in frictional contact, it will be obvious that owing to the great difference in surface
speeds, a tendency will be set up inducing the driven roller to travel faster than
the gearing permits. To prevent the whole of the consequent stress from being
placed upon the gearing, we may employ a brake upon or in connection with the
slow motion shaft. Thus, as indicated by Figure 2, a brake drum or pulley J may
be fixed upon the shaft B and over this there may be passed the strap or rope K,
one end of which is fixed below the shaft and from the other end of which the
weight W is suspended. Any other equivalent form of brake or resistance may be
employed if desired.
Figure 3 represents a modification of the arrangement illustrated by Figure 1,
the essential difference being that the intermediate shaft is in this case vertical
instead of being diagonal, or in other words, that shaft does not cross the line of
centres. The fixing G may be constructed in one piece, with the bearing for E

page_text: between the worm and worm wheel as shewn. The gearing may be encased and
be accessible through the openings closed by the loose covers L L' and the removable
part M.
Instead of transmitting the motion of the shaft E to the shaft B, by means of
the worm and worm wheel C D, as shewn by Figure 1, we may employ the arrange-
ment shewn by Figure 4. In this modification, the worm I is substituted by
the bevel pinion H₁, which gears with the bevel wheel I', fixed on the shaft B,
the bevel wheel substituting the worm wheel I, Figure 1. The ratio of the
speeds of A and B can in each case be varied by varying the pitches and diameters
of the wheels and worms, as is well understood.
Having now particularly described and ascertained the nature of our said In-
vention and in what manner the same is to be performed, we declare that what
we claim is:-
1. The hereinbefore described gearing for transmitting motion from one roller
or shaft to a contiguous roller or shaft required to rotate at a much slower speed,
constructed and arranged substantially as set forth and as illustrated by the
accompanying drawings.
2. The herein before described gearing for transmitting motion from a high
speed roller to a low speed roller running in frictional contact therewith, in com-
bination with a brake in connection with the low speed roller: constructed and
arranged substantially as set forth and as illustrated by the accompanying
drawings.
Dated this 16th day of June A D) 1897