Year: 1887

page_text: Date of Application, 12th Feb., 1887
Complete Left, 12th Nov., 1887
Complete Accepted, 27th Jan., 1888
I DUGALD SCOTT of 12 York Street Manchester in the County of Lancaster
Manufacturer do hereby declare the nature of this invention to be as follows :-
This invention relates to that class of machinery or apparatus used for cutting the
pile of velvets and other similar fabrics, wherein the knives are mounted upon
trunnions or slides in a fixed or movable carriage as described in the Provisional
Specification made by George Roger of Warrington and filed the 28th day of January
1887, No. 1350, the object of my said invention being to cause the sliding either
backwards or forwards of the knife, or its carrier to make or break an electric
circuit and thus by means of electricity to stop the action of the machine on the
occurrence of any fault or accident
For this purpose I prefer to insulate the side plates of the machine upon which the
trunnions of the knife are supported and to connect the said plates respectively with
the poles of a battery and with an electro-magnet in such a way that the magnet will
only be excited so as to attract or support its armature so long as the two side plates
are in electric connection with each other by means of the knife carrier, but as soon
as, from the occurrence of a fault or accident, the knife is caused to slide either back-
wards or forwards a certain distance the trunnions are either moved onto surfaces of
ebonite or other non-conducting material and thus break the electric circuit, or the
same effect will be produced if the knife leaves the side plates altogether and falls
upon the cloth. Or if preferred the movement of the balanced lever which causes (or
is caused by) the sliding of the knife may be made to break or make the electric
circuit.
The electric circuit thus established or broken acting upon the electro-magnet
above mentioned may be made to act upon the stop motion of the machine in a great
variety of ways as will be evident to any skilled mechanic, and I therefore do not
limit my invention to any particular stop mechanism so long as the peculiar feature
of my invention is retained, which is the combination of the sliding knife carrier (or
the balanced lever in connection therewith) in the class of pile cutting machines

page_text: herein before referred to, with an electro-magnet in such a manner that the sliding
forwards or backwards of the knife caused by the occurrence of a fault or accident
shall break or make the electric circuït and thus cause the stoppage of the machine by
the said electro-magnet.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Apparatus for Cutting Velvets, Cords, and other similar
Piled Fabrics.
I DUGALD SCOTT of 12 York Street Manchester in the County of Lancaster
Manufacturer 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 that class of machinery or apparatus used for cutting the
pile of velvets and other similar fabrics, wherein the knives are mounted upon
trunnions or slides in a fixed or movable carriage as described in the Provisional
Specification accompanying an application for Letters Patent made by George Roger
of Warrington and filed the 28th day of January 1887, No. 1350, the object of my
said invention being to cause the sliding either backwards or forwards of the knife or
its carrier to make or break an electric circuit and thus by means of electricity to
stop the action of the machine on the occurrence of any fault or accident.
For this purpose I may insulate the side plates of the machine upon which the
trunnions of the knife are supported and connect the said plates respectively with the
poles of a battery and with an electro-magnet in such a way that the magnet will
only be excited so as to attract or support its armature so long as the two side plates
are in electric connection with each other by means of the knife carrier, so that as soon
as from the occurrence of a fault or accident, the knife is caused to slide either backwards
or forwards a certain distance the trunnions are moved onto portions of the side
plates covered with ebonite or other non-conducting material or leave the side plates
altogether and fall upon the cloth, in either case breaking the current.
In the alternative a portion of the side plates may be made of or formed with some
non-conducting material within the limits of the normal sliding of the knife, and the

page_text: ends of the slide plates made of conducting material joined up with the poles of a
battery and electro magnet so that when the knife slides either backwards or forwards
over the end or edge of the non conducting material the electric circuit is completed
and the magnet brought into action.
Or if preferred the movement of the balanced lever which causes (or is caused by)
the sliding of the knife may be made to break or make the electric circuit.
The electric circuit thus established or broken acting upon the electro magnet
above mentioned may be made to act upon the stop motion of the machine in a great
variety of ways, as will be evident to any skilled mechanic, and, I therefore do not
limit my invention to any particular stop mechanism, so long as the peculiar feature
of my invention is retained, which is the combination of the sliding knife carrier (or
the balanced lever in connection therewith) in the class of pile cutting machines
herein before referred to, with an electro magnet in such a manner that the sliding
forwards or backwards of the knife caused by the occurrence of a fault or accident
shall break or make the electric circuit and thus cause the stoppage of the machine by
the said electro magnet.
I prefer however so to arrange the electric apparatus that the normal state thereof
shall be that the electric circuit is broken and that the circuit is only completed when
a fault occurs; and in order to illustrate the practical application of my invention I
have annexed hereunto a sheet of drawings representing what I have found to be a
simple and effective method of applying my invention in this form.
Fig. 1. on the drawings is an elevation of so much of a pile cutting machine as is
necessary to illustrate the application of my present invention thereto, the machine
represented being one made according to the Specification accompanying an appli-
cation for Letters Patent No. 2206 of 1887, and Fig. 2 is a plan view of the
same.
Fig. 3. is a side elevation of a portion of the same, and, Figs. 4. 5. and 6. are
enlarged views of detached portions of my invention hereinafter more particularly
referred to.
Upon the main driving shaft a, a of the machine I fix an excentric b, which gives
a continuous to and fro motion (at right angles to the driving shaft) to a sliding rod
or bar, c, c.
This rod or bar c, c is provided with two nogs or projections d, d' see detached
section and plan Figs. 5 and 6. and near these two nogs hangs the vertical arm of a
hell crank lever e, e, the horizontal arm of which carries the armature f,f of an
electro-magnets g,g. The vertical arm is in such a position as that when the magnet
is excited it is thrown between the two nogs.
The bell crank lever e, e with its armature f, and the electro magnet g, g are all
carried in a bracket h, h capable of swivelling side ways with the upright shaft i, i to
which the boss of the bracket h, h is fixed.
The weighted lever k, k (see detached view Fig. 4.) which holds the trunnions of
the knife carrier in position (as described in the Specification of George Roger before
referred to) is made of metal and its support or bracket 1, is made of wood or is
otherwise insulated from it. The lever k, k is connected by a wire to one of the
poles of the battery and the two insulated contact points m m (one on each side of
the lever k, k (are connected by a wire or wires m³, m' to one end of the coil of the
electro magnet g, g, and the other end of such coil is connected to the other pole of
the battery.
From this it will be evident that whenever a fault occurs and the weighted lever k, k
is caused to oscillate beyond the normal amount, by the movement of the knife carrier
it comes against one or other of the contact points m, m and thus completes the
electric circuit.
The armature is then attracted by the magnet g.g causing the lower end of the
bell-crank lever e, e to be brought into position to be struck by one or other of
the nogs d, d on the sliding bar c, c which will (through the bracket h, h) give a
portion of a revolution to the upright shaft i, i.
To the upper end of this shaft is keyed a lever n, n jointed to a slide o, carrying

page_text: the strap forks p, p, through which the driving straps (one open and one crossed) of
the machine pass.
Thus whenever a fault occurs the electric circuit is completed by the oscillation of
the lever k, k, the magnet g, g then attracts the armature f₁f which as above described
allows the sliding bar c, c to move the strap fork so as to throw the driving belt, from
the fast onto the loose pulley and thus stops the action of the machine.
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
The combination with the knife carrier, and the strap fork (in the class of machines
above referred to) of an electric stop motion in such a manner that the sliding
movement of such knife carrier caused by a fault or accident, shall by completing or
breaking the electric circuit, cause the said strap fork to throw the strap onto the
loose pulley and thus stop the machine substantially as hereinbefore described and
illustrated by the drawings annexed.