Year: 1894

page_text: Date of Application, 10th Aug., 1894-Accepted, 6th Oct., 1894
Figures 6 and 7 show an arrangement for treating face cutters,
Figures 4 and 5, which are drawn on a larger scale, show the device which
operates the axial adjustment of the shaft, or the cross spindle on which the cutter,
saw or the like is fixed.
A circular cutter or saw K with 15 teeth k is shown in the drawing as an
The circular
example, each of the teeth of which has to have its rear edge cut.
saw K is secured on the cross spindle m, which in its turn is mounted in the
adjustable arm H capable of travelling with the spindle W and also of revolving
in the bearings A' of the levers G mounted on the support A. The rotary move-
ment of the cross spindle m is obtained by means of two equal bevel wheels i
and from the spindle W, which receives its motion from the driving shaft P
through the cog wheels z and Z.
The spindle W is adjustably mounted in the bearings a and b of the supports A
and B. The spindle W receives its travelling movement from a claw disc E',
either fixed or movably arranged thereon. The claw of this disc encounters a
second claw on another claw disc E which is loosely mounted on the spindle W,
but is not adjustable thereon and is set in rotation by means of the cog wheel x
connected therewith. The cog wheel x engages in a change wheel X which is
mounted on the small spindle d, on which spindle is also a second change wheel y
which in turn engages in a cog wheel Y mounted on the driving shaft P. The
driving shaft P is journalled in the bearings a¹ and b' of the two supports A
and B.
If the driving shaft P describe one revolution the spindle W will make
Z revolutions and the speed of the cog wheel x, which revolves in an opposite
direction will be regulated by the proportions of the teeth on the change wheels.
If the proportion of teeth of Z: 2: 3:1 of Y y= 2-51 & of X: z=2:1 for
every rotation of the spindle W, the cog wheel x will make
x 2.5 x 2 = 15
rotations, that is to say when the spindle W or rather the cross spindle m on which
the cutter or saw K is mounted makes one revolution, the spindle W together with
the support H and the cutter K will describe fifteen movements. The return each
077

page_text: time of the spindle after each movement, is brought about by the strong spiral
spring which rests on the one hand against the bearing a of the support A, and
on the other hand against the collar o which is fixed on the spindle W.
By a suitable employment of change wheels X & Y y it is thus quite possible to
adjust the spindle to any desired extent at each revolution, or in other words to
equally cut any suitable number of teeth of a cutter or saw.
2
If the claw disc E' be fixed by the projection e engaging in its recess e¹ in such
a way that the said claw disc can move along the spindle but cannot rotate, the
transfer proportion of the wheels and Z does not come into consideration for
the adjustments of the spindle W, but only the product of the number of teeth of
the two pairs of wheels Yy, X a. For the number of teeth on these wheels assumed
in the drawing (25:1 and 2: 1) the number of adjustments of the spindle is thus
reduced from 15 to 5 by fixing the claw disc E.
In consequence of this arrangement, in combination with the employment of
various change wheels, saws with a smaller number of teeth may also be
conveniently and evenly cut. The cutting of the teeth always takes place in such
a way that in the subsequent sharpening of the same the shape always remains
unaltered.
In order to allow of the change wheels being more conveniently altered, the
spindle d is supported by two arms D arranged in sockets C and adjustable by
means of set screws c, the sockets being able to turn in bearings A' of the support A
and being capable of adjustment and fixing by nuts C.
When it is necessary to change the other wheels in addition to the change
wheels, or to insert other claw discs E or E', it is only necessary to unfasten
the support B and draw it out, and the change may then take place without
removing the main support A.
When cutting face cutters, such as shown in Figures 6 and 7, the adjustable
arm H is removed, the lever G is turned over and the cutter K' is fastened by a
screw directly into the front end of the spindle W. Suitable change wheels are
then placed on the spindle d according to the number of the teeth k' of the
cutter K. The height of the claws of E or E' is suitably increased or diminished,
or suitable claw discs are inserted to correspond with the depth of the teeth to be
cut. Finally instead of only one claw as herein before assumed, the claw tooth
wheel E as well as the claw disc E' may also have several claws of equal size.
This arrangement is more particularly of advantage where it is a question of cutting
cutters or saws with a large number of teeth.
The whole apparatus is extremely simple and cheap, especially when it is not
necessary to have a special frame or support and where it can be applied to any
ordinary lathe frame."
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―
1. An improved apparatus for cutting the teeth of saws, face cutters and the
like, in which the article to be operated on is either directly fastened on a revolving
and adjustable spindle W, or on a cross spindle m connected with such spindle and
operated therefrom, and in which the cutting takes place by the adjustment of the
spindle W or the cross spindle m (the article to be treated Leing approached to, or
removed from, the operating tool) namely by the operation of two claw discs E
and E, one of which revolves with the spindle or is held fast thereon, whilst the
other is set in rotation in an opposite direction to the rotation of the spindle from
the driving axle P by means of a number of change wheels in such a way that at
each rotation of the claw disc E the spindle W is pushed forward to the extent of
a claw and again returned by means of a spring f, so that by a suitable selection of
change wheels for driving the claw disc E, or, if preferred, of wheels for driving
the spindle W, or by fixing the claw disc E', the spindle W, during one rotation,
may be caused to slide backwards and forwards a suitable number of times and the

page_text: cutters or saws may be cut with any desired number of teeth substantially as
hereinbefore described and shown.
2. In order to allow of the change wheels, described in Claim 1, being more
easily interchanged, the arrangement of the latter on a spindle d, the supporting
arms D of which are adjustably arranged and may be fixed in sockets C by means
of screws c', said sockets being able to turn in bearings A¹ and being capable of
adjustment by nuts c substantially as hereinbefore described and shown.
Dated this 9th day of August 1894.
LLEWELYN JONES,
Of 5, South Crescent Chambers, Liverpool, Agent for the Applicant.