AN IMPROVED SYSTEM OF ROTARY MOTION OBTAINED BY THE AID OF CRANKS AND TRANSMITTED BY CHAIN, BAND, OR TOOTHED GEARING, APPLICABLE TO LOOMS, PUMPS, AND VARIOUS MACHINES
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by William Edward Gedge at the Office
of the Commissioners of Patents on the 9th January 1877. A communication
from abroad by Joseph Gillet, of Castres (Tarn), France, Founder.
WILLIAM EDWARD GEDGE, of No. 11, Wellington Street, Strand, in the County of
Middlesex, Patent Agent. "AN IMPROVED SYSTEM OF ROTARY MOTION OBTAINED
BY THE AID OF CRANKS AND TRANSMITTED BY CHAIN, BAND, OR TOOTHED GEARING,
APPLICABLE TO LOOMS, PUMPS, AND VARIOUS MACHINES." A communication from
abroad by Joseph Gillet, of Castres (Tarn), France, Founder.
The object of this Invention is to substitute a circular or rotary motion from a
crank in lieu of the means of transmission pin in ordinary use, such as connecting
rods and other means to communicate motion to weaving looms generally, to lathes,
to pumps, and to sewing and other machines. By this system there is direct action
upon the driving shaft of the machine without jerks or reverse motion; and looms
and other machines may be driven at a regular uniform speed, which may be
accelerated or moderated according to requirement, whereas the working of steam
or hydraulic engines is always irregular.
Rotary movement by cranks may be applied to looms of every kind and to
various machines and mechanisms by the aid of chains, bands, or toothed gearing.
First Case. Rotary motion by cranks transmitted by chains (see Figures 1 and 2 of
the accompanying Sheet of Drawing). In Fig. 1 the letters D, D', indicate the two
circular cranks set on their driving shaft A, F. The front arm of each of these
cranks carries a treadle or receiver of rectangular form which receives the foot
pressure of the operator, man, woman, or child. The letters G, G₁, indicate two
wheels with triangular teeth carrying the endless chain B which transmits the
movement given by the operator. The wheel G is set and keyed on the shaft A, F,
of the cranks, and that G₁ in the same way on the shaft C of the machine which is
to be driven.
Figure 2 is a side view of the above described arrangement, similar letters
denoting similar parts.
Second Case. Rotary motion transmitted by pullies and bands (see Figs. 3
and 4).
As in the preceding case the shaft A, F, receives two circular cranks D and D',
each having a rectangular treadle. These receiving treadles pressed upon by the

page_text: operator turn by means of the cranks D, D¹, the pulley G, keyed on the shaft
A, F, placed in connection with, the pulley G¹ by the endless band B; on the
other hand the pulley G' set on the shaft of the machine to be driven communicates
to it the impulsion received.
Third Case. Rotary crank motion transmitted by toothed gearing (see Figs. 5
and 6) A, F, always indicates the shaft driven by the two circular cranks, which are
themselves set in motion by the feet of the workman or driver by the aid of the
treadles T, T The letters E, K, L, indicate the frame receiving the toothed
wheels J, H, I, R. The toothed wheels J and R are of the same given diameter,
which may vary. The toothed wheels Hand I are also of a same given and variable
diameter, but larger than that of the wheels J and R, so that the wheel J keyed on
the shaft A, F, carrying the cranks D and D receiving motion from the operator, by
means of these latter transmits this movement to the wheel, H, which communicates
it to the wheel I gearing with the wheel J turning the shaft C, on which it is
keyed, and this latter the shaft of the machine to be driven.
Figure 7 represents a particular arrangement of this rotary movement by cranks,
which would be applicable to looms or machines requiring greater pressure to drive
then than that anticipated in the three cases aforesaid.
To obtain in this apparatus the degree of strength indispensable for regularity of
motion the parts are arranged as follows:-The chain or band or series of toothed
wheels, instead of being placed as in Figures 1, 2, 3, 4, 5, and 6 between the two
cranks D and D¹ is placed at the end of the shaft A, F, and consequently outside of
the receiving treadles. The bearings of the shaft A, F, are also placed exteriorly as
regards the cranks D, D'..
Figures 7, 8, 9, and 10 illustrate an arrangement of the rotary crank motion of
this Invention particularly applicable to sewing machines, Figure 7 being a top plan
view of crank and shaft provided with two treadles; Fig. 8, side and transverse
view of a treadle; Fig. 9, bottom plan of a treadle; Fig. 10, top plan view of same.