Improvements in Loom Driving Mechanism.
Year: 1896

page_text: ISIONAL SPE
Improvements in Loom Driving Mechanism.
We MARK HARDY of 63 Springfield Buildings High Street Morley in the County of
York Loom Tuner, DAVID WILLIAM SCHOLES and SAMUEL SCHOLES both of Quarry
Mills Morley in the County of York Woollen Manufacturers do hereby declare the
nature of this invention to be as follows:-
The object of our invention is to lessen the dwell at the end of each complete
movement of the shuttle race, or more strictly speaking to increase the proportion of
time available for the passage of the shuttle to that occupied by a complete revolution
of the crank shaft. As the allowable speed of the shuttle is the principal factor
limiting the speed of the loom, it is evident that where the looms are at present
worked at the greatest speed allowed by the shuttle movement, any increase in the
speed of such looms can only be obtained by shortening the time not occupied by the
shuttle movement.
This we effect by mounting or fixing a circular toothed wheel excentrically on the
crank shaft and gearing this with a correspondingly oval shaped toothed wheel on the
driving shaft. In the usual case the crank shaft makes double the number of
revolutions made by the driving shaft, so that the oval wheel is provided with double
the number of teeth on the excentrically placed circular wheel.
The above mentioned excentrically placed circular wheel is so fixed on the crank
shaft, that its sinallest, radius is in line with one of the two longest radii of the oval
wheel when the crank is in the back horizontal position pointing towards the breast
beam.
Improvements in Loom Driving Mechanism.
We MARK HARDY of 63 Springfield Buildings High Street Morley in the County of
York Loon Tuner and DAVID WILLIAM SCHOLES and SAMUEL SCHOLES both of Quarry
Mills Morley in the County of York Woollen Manufacturers do bereby 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 :-
The object of our invention is to lessen the dwell at the end of each complete
(i.e. to and fro) motion of the shuttle race, or more strictly speaking to increase the
proportion of time available for the passage of the shuttle to that occupied by a

page_text: complete revolution of the crank shaft which actuates the shuttle race. As the
allowable speed of the shuttle is the principal factor limiting the speed of the loom,
it is evident that where looms are at present worked at the greatest speed allowed by
the shuttle movement, any increase in the speed of such looms can only be obtained
by shortening the time not occupied by the shuttle movement, i.e. the dwell.
This we effect by mounting or fixing a circular toothed wheel eccentrically on the
end of the crank shaft, and gearing this with an oval or elliptically shaped toothed
wheel on the drawing shaft. In the usual case the crank shaft makes double the
number of revolutions made by the driving shaft, so that the number of teeth on
the above mentioned oval or elliptical wheel is double the number of teeth on
the eccentrically placed circular wheel.
The eccentrically placed circular wheel is so fixed on the crank shaft, that its
smallest radius is in line with one of the two longest radii of the oval wheel when the
crank is in the back horizontal position pointing towards the breast beam.
And in order that our invention and the manner in which the same is to be
performed may be more readily and clearly understood we have annexed hereto the
accompanying sheet of drawings by way of illustration, and in which Fig. 1
represents the part end or side elevation of a loom, and Fig. 2 is a corresponding
part plan.
a indicates the side frame of a loom.
b is the corresponding end of the crank shaft, the cranks d of which are connected
to and actuate the shuttle race.
e is the circular toothed wheel fitted eccentrically on the end of the crank
shaft. b.
c is the driving shaft, on the end of which is fitted the oval or elliptically shaped
toothed wheelf, gearing with the eccentrically placed circular wheel e. In order that
the crank shaft may inake exactly double the number of revolutions made by the
driving shaft, the number of teeth on the elliptical wheel ƒ is exactly double the
number of teeth on the wheel e. The wheel e is fitted on the end of the shaft b, so
that its longest radius bg is in line with one of the shorter radii cg (or cgl) of the
elliptical wheel f, when the crank is in the forward horizontal position pointing away
from the breast-beam as shewn in the drawings.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what we
claim is
In Looms in which the crank shaft makes double the number of revolutions made
by the driving shaft the combination of a circular toothed wheel fitted eccentrically
on the crank shaft with and gearing with an oval or elliptical toothed wheel on the
driving shaft the latter having double the number of teeth provided on the former
substantially as and for the purpose set forth.
Dated this 1st day of May 1807
J. CLARK JEFFERSON,
30 Park Row, Leeds, Agent for the aforesaid Applicants.