Electrically Operated Cloth Cutters.
Year: 1898

page_text: Date of Application, 16th July, 1898-Accepted, 20th Aug., 1898
COMPLETE SPECIFICATION.
Electrically Operated Cloth Cutters.
I, NICHOLAS GARLAND, of 76, Bay Street, in the City of Toronto, in the County
of York, in the Province of Ontario, Canada, Machinist, 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 :-
My invention relates to improvements in electrically operated cloth cutters and the
object of the invention is-first-to improve the construction of the knife, so that it
may run easily no matter how many webs of cloth it may be employed to cut-secondly
-to provide a secure means for fastening the balance-crank to the rod connecting it
to the knife rod-thirdly-to overcome the vibration of the base and consequently the
knife and thus enable the machine to cut with precision-fourthly-to provide an
improved electrical contact from the current wires to the motor and-fifthly-to
provide a simple means of, sharpening the knife, utilizing the motor shaft and it
consists essentially in the various details of construction hereinafter more
particularly explained in detail in reference to the accompanying drawings.
Fig. 1 is a perspective view of my machine provided with my improvements.
Fig. 2 is a cross section on the line x--y Fig. 1.
Fig. 3 is a detail showing the electrical connection.
Figs. 4, 5, and 6 are details showing the form of connection between the crank
and connecting rod.
Fig. 7 is a detail of the knife.
Fig. 8 is a detail of the end of the motor shaft with emery wheel attached
thereto.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A is the base plate of machine, B the stem, C the motor, D the main shaft of the
motor, E the balance crank and F the connecting rod from the balance crank to
the clasp G on the knife rod H. I is the knife.
It will be noticed that the knife I has a bottom inclined bevelled sharpened edge
i and an inclined bevelled sharpened front edge ¹, which meets the front of the
bottom edge i. The front of the knife is provided with a plurality of serrations,
the front of which is inclined and the bottom 3 also inclined both being bevelled
and sharpened to form cutting edges.
I have found in practice, that when I simply sharpen the bottom edge of the
knife, that when such knife is used to cut through several webs of cloth
simultaneously it would stick and not properly perform its function. In order to
overcome this objection I have devised the form of knife herein before described,
which effectually cuts through any desired number of webs of cloth laid upon one
another with rapidity and precision.
In order to hold the end of the connecting rod F to the crank E so that there
will be no danger of the crank pin becoming loose, I provide the following
simple arrangement. f is the enlarged end of the connecting rod F. f¹ is a
screw pin, which extends through the enlarged end f and crank E. J is a pin
provided with a substantially rectangular head J¹ and reduced end ¹. The pin J

page_text: extends through a corresponding hole in close proximity to the screw pin f¹. The
inner end of the head J is provided with an arc-shaped threaded or chased
portion, which fits the thread of the screw pin f'. A nut j³ secures the pin J
in position.
It will, therefore, be understood that as the thread 2 of the pin J extends into
the thread of the pin f¹ that such screw pin F will not be liable to become
unscrewed during the rotation of the crank.
In order to prevent vibration of the base A and consequently the knife I
provide rollers K at the rear of the base plate and underneath the same fitting
into recesses a in the base plate and secured on the end of a spring shaft L.
The round portions of the shaft L extend through loose bearings a¹ to the
inside of the recess a. On top of the square portion of the shaft L and
between it and the bottom of the base plate A I place a rubber or flexible
cushion a².
I have found in practice that this construction is very effective as the spring
shaft and rubber cushion a² effectually. take away all vibration of the base plate and
render the running of the knife smooth and precise.
In order to provide for a positive connection for the electrical wires I provide
at the end of the top portion of the field magnet ring two pins c preferably
of brass, one only. of which is shown which fit into the binding post
sockets c¹. The ends of the sockets c' have slits c² and as the metal is spring
metal this makes the slitted ends of the sockets form a spring and a very
positive connection between the pin c and the socket. The sockets are held in
a suitable insulating plate C¹ as indicated and the wires are connected one to each
socket.
I have also provided in the improvements on my machine a threaded end d to
the motor shaft D on to which is screwed the internally threaded hub D¹ of the
emery wheel D². The hub is provided with a knurled ring d² to enable such hub
to be screwed in place.
By this simple device I am enabled to sharpen the knife at any time with but
little trouble as such knife may be readily removed for this purpose.
I may also mention that in my form of machine, that such knife will not
only cut the cloth as it descends but will also cut it in its upward ascent. I
thus provide a reciprocating knife, which is always in action during
•
movement.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a cloth cutting machine, a knife having an inclined bottom bevelled sharpened
edge, a bevelled sharpened front edge receding from the point at the top and
outwardly extending inclined bevelled bottom edge extending from the top of the
lower front edge and a corresponding bevelled sharpened front edge extending
upwardly and backwardly therefrom forming a plurality of knife edge serrations as
and for the purpose specified.
2. In a machine of the class described, the combination with the knife rod and
connecting rod, main shaft and crank, of the threaded crank pin extending through
the enlarged end of the connecting rod, the locking pin extending traversely to
the crank pin through the side of the crank and provided with an arc-shaped
threaded portion fitting the thread of the screw pin of the crank as and for the
purpose specified.
3. In a machine of the class described, the combination with the base plate, of
the rear rollers, a spring shaft to which they are secured, suitable journals for
the shaft and a spring cushion between the central portion of the shaft and to the
base plate as shown and for the purpose specified.
4. In a machine of the class described, the combination with the field magnet
ring provided with rearwardly projecting pins, of the insulating, plate sockets

page_text: fitting therein provided with slits in the entrance end thereof, such sockets fitting
over the pins and forming a connection and the wires connected to the sockets as
and for the purpose specified.
5. In a machine of the class described, the combination with the motor shaft
having a threaded rear end, of the emery wheel provided with an internally
threaded socket hub arranged as shewn and for the purpose specified.
Dal 1 10
1
T 1
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.