Improvements relating to Dividing Machines for Use in Making Toothed Wheels, Dials, and the like.
Year: 1895

page_text: Date of Application, 6th Dec., 1895
Complete Specification Left, 5th Sept.. 1896-Accepted, 5th Dec., 1896
PROVISIONAL SE MULTIATION.
Improvements relating to Dividing Machines for Use in Making
Toothed Wheels, Dials, and the like.
I, NOWMAN MICKA SAATI, of No. 40 Vernon Street, Providence, Rhode Island,
United States of America, do hereby declare the nature of this invention to be as
follows:-
This invention relates to machines for dividing circular articles such as cog-wheels,
dials and the like with mathematical precision into equal divisions.
The machines which are actually used for dividing into equal divisions cog-wheels,
dials, and the like are generally provided with a disc having a series of circular
ranges of notches intended to progressively rotate the article to be divided in front
of the dividing tool, each of these circular ranges of notches corresponding to one
division, or to a number of divisions into which the first one may be divided.
Such ranges of notches are generally disposed in concentric circles upon the said
disc and the notches are made deep enough to enable a suitable pin of the dividing
tool to engage the same.
Now it has been proved in practice that, notwithstanding the exactitude with
which such divided dises may have been executed, the machines provided with such
dividing implement never work mathematically correct and this is especially noticeable
when applied to the division of very small cog-wheels, as for instance wheels for
watch-movements.
The object of this invention is to provide a new device intended to replace the
above-mentioned notched discs in machines for dividing cog-wheels or similar articles
and to completely avoid any and every inaccuracy in the working of the same and
obtain work of mathematical exactness and precision.
.
To that effect I provide a number of sets of two similar wheels each having a
range of teeth projecting over one face of the wheel and disposed concentrically
around the same each of these wheels forming a so-called crown-wheel and the two
wheels of one set having one and the same number of teeth and being divided as
exactly as possible.
Each set of two wheels is intended to replace one of the circular ranges of
notches with which are provided the well-known dividing-machines mentioned above
and to be used for making on the article which is to be divided a certain number
of divisions.
same manner.
These sets of two wheels are interchangeable and intended to work in one and the
I shall therefore consider in the following description only one of
them, it being well understood that the number of teeth of the described sets of
wheels may be chosen at will according to the number of divisions which are to be
provided on the article to be divided.
The said two wheels of one set are placed adjacent in front of one another around
one and the same axis with their crown-shaped teeth ranges engaging into one
another.
One of the said two wheels is fixed to a rotating shaft which bears by means of
the usual well-known devices the article to be divided. The second wheel is placed
concentrically to the axis of the said shaft upon a fixed sleeve on which it is adapted.
to slide axially, suitable means being provided for preventing its being rotated, for

page_text: instance two studs or projections of the fixed bearing to which is affixed the aforesaid
sleeve projecting excentrically through the said wheel. There are further provided
suitable springs which tend to press the said sliding wheel against the wheel fixed on
the rotative shaft which latter is fixed in its axial direction.
The rotating wheel is therefore prevented from being rotated as long as the fixed
or sliding wheel is pressed into engagement and gears with the same, but the said
rotating wheel may be rotated through a distance of one or more of its teeth as soon
as the sliding wheel is disengaged by any suitable means whatever out of gear of
the said rotative wheel.
Now it will easily be understood that when the shaft carrying the article to be
divided and carrying at same time the rotating crown-wheel is rotated progressively
by successively disengaging and re-engaging the sliding crown-wheel tooth by
tooth, with the rotating crown-wheel, the progression of rotation thus obtained will
be for each tooth thus disengaged and re-engaged quite exact, any and every possible
inaccuracy of the division of the teeth-range of one of the two crown-wheels which
work in the described manner being necessarily compensated by its being successively
engaged with all the teeth of the other crown-wheel.
It is to be well understood that the teeth of the abovementioned crown-wheels
may be of any suitable form whatever and that they may be replaced by series of
pins fixed to one of the said wheels and engaging a series of holes provided to the
other.
D. 21° 211
A
Improvements relating to Dividing Machines for Use in Making
Toothed Wheels, Dials, and the like.
I, NOWMAN MICKA SAATI, of No. 40 Vernon Street, Providence, Rhode Island,
United States of America, 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 machines for dividing circular articles such as cog-wheels,
dials and the like with mathematical precision into equal divisions.
The machines which are actually used for dividing into equal divisions cog-wheels,
dials, and the like are generally provided with a disc having a series of circular
ranges of notches intended to progressively rotate the articles to be divided in front
of the dividing tool, each of these circular ranges of notches corresponding to one
division, or to a number of divisions, into which the first one may be divided.
Such ranges of notches are generally disposed in concentric circles upon the said
disc and the notches are made deep enough to enable a suitable pin of the dividing
tool to engage the same.
Now it has been proved in practice that, notwithstanding the exactitude with
which such divided discs may have been executed, the machines provided with such
dividing implement never work mathematically correct and this is especially noticeable
when applied to the division of very small cog-wheels, as for instance wheels for
watch-movements.
The object of this invention is to provide a new device intended to replace the
above-mentioned discs in machines for dividing cog-wheels or similar articles and to
completely avoid any and every inaccuracy in the working of the same and obtain
work of mathematical exactness and precision.

page_text: To that effect I provide a number of sets of two similar wheels each having a
range of teeth projecting over one face of the wheel and disposed concentrically
around the same each of these forming a so-called crown-wheel and the two wheels
of one set having one and the same number of teeth and being divided as exactly
as possible.
Each set of two wheels is intended to replace one of the circular ranges of
notches with which are provided the well-known dividing-machines mentioned above
and to be used for making on the article which is to be divided a certain number
of divisions.
The accompanying drawing is a schematical illustration of a dividing-machine
constructed according to my invention, in which
Figure 1 is a longitudinal side elevation partly in section, and
Figure 2 is an end elevation of the same.
These sets of two wheels A and B are interchangeable and intended to work in
one and the same manner. I shall therefore consider in the following description
only one of them, it being well understood that the number of teeth a and b of the
described sets of wheels may be chosen at will according to the number of divisions
which are to be provided on the article to be divided..
The said two wheels A and B of one set are placed adjacent in front of one
another around one and the same axis with their crown-shaped teeth a and 6 engaging
into one another.
One of the said two wheels, A, is fixed to a rotating shaft C which bears by means
of the usual well known devices, for instance by means of a screw-nut x or by
means of a clutch of any convenient construction whatever, the article X to be
divided. The second wheel is placed concentrically to the axis of the said shaft
upon a sleeve D fixed on a support D' on which it is adapted to slide axially,
suitable means being provided for preventing its being rotated, for instance two
studs or projections d of the fixed bearing D' to which is affixed the said studs or
projections d projecting excentrically through the said wheel B. There are further
provided suitable springs E which tend to press the said sliding wheel B against
the wheel A fixed on the rotative shaft which latter is fixed in its axial direction by
any well known suitable means whatever.
There are further provided means for retracting the sliding wheel B out of gear
with the fixed wheel A for instance by means of a hand lever F having a projection f
engaging a suitable hole of the hub of said wheel B and pivoted at a fixed point of
the frame of the machine.
The rotating wheel A is therefore prevented from being rotated as long as the
fixed or sliding wheel B is pressed into engagement and gears with the same, but
the said rotating wheel A may be rotated through a distance of one or more of its
teeth as soon as the sliding wheel B is disengaged by means of the hand lever F
or of any suitable means whatever out of gear with the said rotative wheel.
Now it will easily be understood that when the shaft C carrying the article to be
divided and carrying at the same time the rotating crown-wheel A is rotated
progressively by successively disengaging and re-engaging the sliding crown-wheel B
tooth by tooth, with the rotating crown-wheel A, the progression of rotation thus
obtained will be for each tooth thus disengaged and re-engaged quite exact, any
and every possible inaccuracy of the division of the teeth of one of the two crown
wheels which work in the described manner being necessarily compensated by its
being successively engaged with all the teeth of the other crown-wheel.
The drawing shows for instance a cutting-wheel G intended to cut teeth on the
periphery of a wheel X the said cutting-wheel G being supported by two sliding
bearings H and 1 of usual construction.
It is to be well understood that the teeth of the above-mentioned crown-wheels
may be of any suitable form whatever and that they may be replaced by series of
pins fixed to one of the said wheels and engaging a series of holes provided in the
other.

page_text: 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 :-
A dividing-machine characterized by the combination of a toothed wheel fixed on
a rotative shaft which bears the object to be divided, with a wheel of corresponding
teeth sliding on a sleeve concentric to the said axis and the rotation of which is
prevented by any suitable means whatever, the rotative wheel being liable to be
rotated tooth by tooth in front of the sliding wheel in view of rotating the object
to be divided through an angle determined by the number of teeth of the wheels,
in front of a stationary tool intended to mark or to cut the divisions on the said
object.
יווי
Septemb.
HASELTINE LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.