Improvements in Machines for Cutting Toothed Wheels.
Year: 1899

page_text: Date of Application, 4th Jan., 1899
Complete Specification Left, 4th Oct., 1899-Accepted, 30th Dec.,
1898
PROVISIONAL SPECIFICATION.
Improvements in Machines for Cutting Toothed Wheels.
I, JASON SAVILLE, of 52, Harris Street, Bradford, in the County of York, Machine
Maker, do hereby declare the nature of this invention to be as follows:-
This invention more particularly relates to improvements in that type of
machines for cutting toothed or gear wheels in which the cutting feed is effected
by means of a rotating nut moving along a screw which for the time being
is stationary and which is rotated to withdraw the cutter from action each time
a tooth is cut.
To
To carry out my invention I mount a fast and loose pulley on the said screw
and I employ a lever and rolling weight or other suitable automatic belt chang-
ing motion adapted to be put into operation by the motion of the cutter carriage
or saddle to transfer the belt from the loose to the fast pulley and vice versa.
prevent the friction between the nut and screw or between the loose pulley and the
screw causing the latter to revolve I employ a stop piece on a fixed stud or its
equivalent which by the motion of the belt changing lever or other suitable part
is brought into the path of a pin or projection on the fixed pulley or its
equivalent and thereby prevent its rotation. Instead of a fixed stop a brake or
friction device may under the influence of the weighted lever be brought to
bear upon the fixed pulley or other convenient part to prevent it rotating whilst
the belt is upon the loose pulley.
The change or dividing motion for moving the wheel or blank to be cut after each
tooth is finished and the cutter withdrawn is operated by a belt driven pulley coupled
to its shaft by a friction device. The change or dividing motion is stopped by
a stop or projection on the periphery of a disc engaging a detent lever brought
into operation therefor by a spring or weight. This detent lever is disengaged
from said stop or projection by a trigger piece pivoted to a lever operated by a
rod or its equivalent engaging the saddle. This trigger piece may be disengaged
from the stop piece by an incline on the former engaging a fixed pin or projection.
Instead of a fast and loose pulley I may employ a clutch operated in any con-
venient way from the cutter carriage or saddle to alternately connect and disconnect
the driving pulley with the screw. A stop or brake is in this case also provided
to hold the screw stationary when the clutch is out of gear.
The change or dividing motion is operated by a belt from a counter shaft as
well as the pulley driving the feed screw and the cutter spindle is driven by a
half crossed belt from a pulley on the same shaft of sufficient width to permit
of the traverse of the carriage.
Dated this 3rd day of January 1899.
DRACUP & NOWELL,
Patent Agents, Bradford.

page_text: Improvements in Machines for Cutting Toothed. Wheels.
I, JASON SAVILLE, of 52, Harris Street, Bradford, in the County of York, Machine
Maker, 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:-
3.
This invention relates to improvements in that type of machine for cutting
toothed gear wheels in which the cutting feed is effected by means of a rotating
nut moving along a screw which for the time being is stationary and which is
rotated to withdraw the cutter from action each time a tooth is cut.
To fully describe my invention reference is made to the accompanying sheet of
drawings forming a part of this specification, in which similar figures of reference
indicate corresponding parts in each of the views.
Figure 1, is an end view of such parts of a wheel tooth cutting machine as
are necessary to illustrate the application of my improvements.
Figure 2, is a side view of the same.
Figures 3 to 5, are views of detail hereinafter referred to.
The bed of ordinary construction is fitted with the sliding saddle 3 carrying
the cutter spindle 4 actuated in any convenient manner. The wheel or blank
to be cut is mounted on the spindle 5 fitted in the saddle 6 adjustably mounted
upon the vertical slide 7. The spindle 5 has a dividing worm wheel not shown
in the drawings fixed on its outer end and actuated by a worm also omitted
mounted on and driven by the vertical shaft 9.
A fast pulley 10 and a loose pulley 11 are mounted upon the outer end of the
screw 13 which screw is automatically actuated each time the motion of the
saddle 3 requires reversing to withdraw the cutter. For this purpose I employ
a lever 15 loosely mounted on the end of the cross shaft 16. This fever has claws
17, 17 which alternately engage opposite sides of the belt fork lever 18 each time
the lever 15 is moved sufficiently to cause the rolling weight 20 to roll from
one end to the other of the guide 21 on the top of the lever 15. The claws 17.
engaging the lever 18 in this way move it under the influence of the weight 20
so that the belt is automatically transferred from the fast pulley 10 to the loose
pulley 11 and vice versa. The lever 15 is actuated by the rod 25 coupled to it
and passing through the bracket 26 on the saddle. Adjustable coilars 27 are
mounted on the rod on each side of the bracket 26 and are alternately engaged
by the latter to operate the rod.
To prevent the friction between the rotary nut in the saddle 3 and the screw 13
or between the loose pulley 11 and the screw causing the latter to revolve I
employ the brake shoe 28 pivoted by its arm 30 upon the stud 29. A forked
arm 31 on the shaft 16 engages the shoe arm 30 and moves the shoe into or
out of contact with the periphery of the pulley 10 according to whether the belt
is off or on said pulley. The stud or projection 32 is provided on the bed 2 to
limit the downward movement of the shoe. Figure 3, is a sectional view on the
broken line a, b Figure 1 of the brake device. I may employ a stop piece on
the arm 30 to engage a projection on the pulley 10 instead of the shoe 28.
Instead of a fast and loose pulley I may employ a clutch moved into and
out of operation in a similar way. A brake or stop is in this case also provided
to hold the clutch stationary when the screw is out of gear.
The worm shaft 9 is automatically operated each time a tooth is finished and
the cutter withdrawn by the pulley 40 mounted upon the shaft 41 and frictionally
connected to it by the leather or other suitable discs 43 pressed against it on

page_text: each side by the collars 44 on said shaft. The pulley 40 is continuously driven
and its motion is arrested each time after the wheel being out is moved the
distance between each tooth by means of the stop 50 on the disc 51 engaging
the detent lever 52. The shaft 41 is coupled by the bevel wheels 53 to the
shaft 9 and this shaft is connected by the bevel wheel 54 and a train of change
wheels mounted on the wheel plate 55 to a wheel driving the disc 51. The
lever 52 is normally kept in contact with the stop 50 by the spring 56 but each
time the saddle 3 completely withdraws the cutter from the wheel being cut the
lever 60 preferably mounted on the same stud 01 as the lever 52, is drawn
forward by the chain 62, connected to the adjustable hook 63 on the saddle 2,
and its trigger piece 65 pivoted on its upper end engages the top of the lever 52
and moves it out of contact with the stop 50. This leaves the stop device free to
turn and consequently the worm shaft 9 is put into operation and the wheel to
be cut is turned the distance between the teeth. The further movement by the
saddle of the lever 60 brings the incline 67 on the trigger against the stationary
stud 68 and thereby depressing the inclined end of the trigger piece disengages
the other end from the lever 62 and leaves the latter free to spring back into
position to re-engage the stop 50. A spring 70 is provided to return the lever 60
to the position shown in Figure 2 and the trigger 65 is either so weighted or
provided with a spring that it normally rests against a stop 72 on the lever 60.
Figure 4, is a view of the stop mechanism with the stop 50 on the point of dis-
engaging the lever 52. Figure 5 is a view showing the trigger releasing the
lever 52.
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 wheel tooth cutting machine, the combination with the lever 15 actuated
by an adjustable connection with the cutter saddle and fitted with a rolling
weight of a belt changing or clutch operating lever, all arranged and operating
substantially as herein shown and described.
2. In a wheel tooth cutting machine, the combination with the lever 15 actuated
by an adjustable connection with the cutter saddle and fitted with a rolling
weight, of a belt changing or clutch operating lever 18 and a brake 28 all arranged
and operating substantially as herein shown and described.
3. The combination with the stop disc 51 of the stop lever 52 and the lever 60
actuated by an adjustable connection with the cutter saddle and carrying a
trigger piece 65 adapted to be released by a fixed stop, substantially as herein
shown and described and illustrated in the accompanying drawings.
Dated this 2nd day of October 1899.
DRACUP & NOWELL,
Patent Agents, Bradford.