IMPROVE- MENTS IN APPARATUS FOR CUTTING AND FINISHING THE TEETH OF WHEELS
Year: 1862

page_text: PROVISIONAL SPECIFICATION left by Charles Edward Guye at the
Office of the Commissioners of Patents, with his Petition, on the
16th September 1862.-A communication from abroad by Victor Cibert,
residing at Tours, in France.
I, CHARLES EDWARD GUYE, of Fleurier, Canton Neuchatel, Switzerland,
Watchmaker, do hereby declare the nature of the Invention for "IMPROVE-
MENTS IN APPARATUS FOR CUTTING AND FINISHING THE TEETH OF WHEELS," to
be as follows:-
This Invention has for its object improvements in apparatus for cutting
and finishing the teeth of toothed wheels. The frame of the apparatus is com-
posed of two horizontal plates connected together at a distanco apart from each
other; through holes in the centre of both plates a vertical axis passes; on the
upper end of this axis, and above the upper horizontal plate, is mounted the
wheel to be cut. The upper end of the axis is held correctly in its proper
position by being formed to a point which enters a hole in a spring; the
spring is carried on the under sido of an arm projecting from a standard
carried by the upper horizontal plate. This arm can be raised or lowered on
the standard, and be fastened to any position by a set screw; the spring can
also be pressed down by a scrow screwing through the arm, so that the pressure
of the spring upon the upper end of the axis may be regulated. On the lower
end of the axis, and between the horizontal platos, is a ratchet wheel which

page_text: acts as a dividing wheel; into the teeth of this wheel a click carried by an
arm turning around the axis is pressed by a spring; by moving this arm to
and fro the ratchet wheel, and therefore the axis which carries it, will be moved
round, and the extent of movement given to the wheel will depend on the
distance the arm is moved; this is regulated by the arm at each end of its
movement coming against the end of a screw. The two screws screw through
standards carried by the lower plate, and by causing the screws to project
more or less from the standards the amount of movement given to the arm
can be varied. The tool which is to cut the teeth in the wheels is similar to
a graving tool, the point of the tool being of the form of the piece required
to be cut out from between two teeth of the wheel; this tool projects at
right angles from a horizontal axis, on which is a grooved pulley, over which
an endless cord passes, and by which cord the axis is rapidly rotated. The
ends of the axis are supported by and turn on two screws pointed at their
ends. The screws are carried by a slide capable of sliding up and down on a
vertical standard; this standard projects upwards from another slide capable
of sliding horizontally on the upper part of the framing, and to or from the
axis on which the wheel to be cut is held. This horizontal slide can be
moved by a screw to any required distance from tho axis carrying the wheel
to be cut so as to bring the cutter into a proper position for cutting different
sized wheels. The slide which carries the cutter axis is constantly drawn by
a spring towards the upper end of the standard upon which it slides, and
when tho slide is at its highest position, the cutter is so raised that it cannot
act on the wheel to be cut; and in order to bring the cutter into a position
to act on the wheel the slido must be depressed; this is effected by a slow
rotary motion being transmitted by a chain of wheels from a pinion on the
cutter axis to an axis at the upper end of the slide. On this axis is a cam,
the upper surface of which is constantly drawn by the spring against a fixed
stop on the upper end of the standard; the cam is shaped somewhat like a
ratchet wheel, so that on its axis being slowly rotated, the slide will be
gradually depressed, and when the slide has been lowered to the required
extent, the cam will allow the slide to be suddenly drawn by the spring into its
highest position; when this takes place, the workman will cause the axis on
which the wheel to be cut is held to make a partial rotation, as above
described, so as to bring a fresh portion of the wheel into position to be acted
on by the cutter, when it is again caused to descend by the cam, and so on
until all the teeth have been cut. The cam may be shaped in such manner
as to cause the slide to rise and fall once for each of its complete revolutions,

page_text: or so as to cause it to rise and fall, two, three, or more times for each revo-
lution. By thus causing the tool to be brought slowly up to its work by the
movement of the machine, the point of the tool will last much longer than
when the tool could be moved quickly up to the wheel to be cut.