IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GROOVING METAL ROLLS OR ROLLERS
Year: 1883

page_text: LETTERS PATENT to David Burr of Westfield, Derby Road Croydon in the
County of Surrey. for an Invention of IMPROVEMENTS IN MACHINERY OR
APPARATUS FOR GROOVING METAL ROLLS OR ROLLERS
"
PROVISIONAL SPECIFICATION left by the said David Burr at the Office of
the Commissioners of Patents on the 7th November 1883.
DAVID BURR of Westfield, Derby Road Croydon in the County of Surrey
IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GROOVING METAL ROLLS OR
ROLLERS,"
According to my present invention I construct machinery or apparatus for
helically grooving metal rolls or rollers, more particularly chilled rolls, as follows:
Upon the bed of an ordinary planing machine I mount a framing carrying a
spindle having a toothed wheel and serving, by means of suitable chucks, to hold
and impart rotation to the roll to be grooved. The said toothed wheel gears,
either by means of a worm or by other speed reducing gear, with a shaft having
loose upon it a toothed wheel receiving motion through change wheels, from a
pinion gearing with a rack fixed on the frame of the planing machine, so that as
the bed of the machine travels to and fro, the fixed rack causes rotary motion to
bo imparted alternately in contrary directions to the said loose wheel. On each
side of such wheel is a ratchet wheel, fixed on the shaft, which wheels have their
ratchet teeth in opposite directions, and the toothed wheel has two opposite pawls
gearing respectively with the said ratchet wheels, one of which has a greater
number of teeth than the other. Thus, when the planing machine bed is moved in
one direction for bringing the roll under the action of the cutter, the said loose
wheel imparts, through the ratchet wheel having the greater number of teeth, a
alow rotary motion to the shaft carrying the roll, so that a helical groove of the
desired pitch is cut upon the latter. On the backward motion of the planing
machine bed, the loose wheel, by means of the second ratchet wheel, imparts a
rotary motion in the contrary direction to the shaft and roll, thus turning the
latter back again, but to a less extent than the forward turn, owing to the less
number of teeth of the second ratchet, and thus the roll is brought into such a
A

page_text: position that the cutting tool will, at the next forward motion, groove the roll at a
certain distance from the first groove, such distance being capable of accurate
adjustment by varying the difference between the two ratchet wheels.
Or, according to another arrangement, the loose wheel is made to gear, through
a second set of change wheels, with a second pinion in gear with the before-
mentioned rack, such change wheels being so proportioned as to turn the loose
wheel through a somewhat less distance on the back motion of the planing machine
bed, than the first set of change wheels turns it on the forward motion. In this
case, both the ratchet wheels have the same number of teeth, and the pawl
actuating the one ratchet wheel is thrown out of gear while the other is in gear.
Or, in place of actuating both ratchet wheels by one and the same loose wheel, the
ratchet wheels may be arranged on separate shafts with two loose wheels, the one
being actuated by means of the one set of chango wheels and the other by the
second set, and, in this case, there may be two shafts carrying two rolls to be
grooved, arranged side by side, and one ratchet wheel and loose wheel may be
geared to each of the shafts, which are then geared together in such manner that
the rotary motion imparted to the one roll is also imparted in the same direction
to the other. This arrangement of imparting motion simultaneously to two rolls
situated side by side may also be applied to the first described arrangement, the
two shafts being geared together so as to revolve in one and the same direction.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said David Burr in the Patent Office on the 6th May 1884.
DAVID BURR of Westfield Derby Road, Croydon in the County of Surrey,
"IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GROOVING METAL ROLLS OR
ROLLERS
"
According to my present invention, I construct machinery or apparatus for
helically grooving metal rolls or rollers, more particularly chilled rolls, as follows:-
Upon the bed of an ordinary planing machine, I mount a framing carrying a
spindle having a toothed wheel, and serving by means of suitable chucks, to hold
and impart rotation to the roll to be grooved. The said toothed wheel gears,
either by means of a worm or by other speed reducing gear, with a shaft having
loose upon it a toothed wheel receiving motion through change wheels, from a
pinion gearing with a rack fixed on the frame of the planing machine, so that as
the bed of the machine travels to and fro; the fixed rack causes rotary motion to
be imparted alternately in contrary directions to the said loose wheel. On each
side of such wheel is a ratchet wheel fixed on the shaft which wheels have their
ratchet teeth in opposite directions, and the toothed wheel has two opposite pawls
gearing respectively with the said ratchet wheels, one of which has a greater
number of teeth than the other. Thus, when the planing machine bed is moved in
one direction for bringing the roll under the action of the cutter, the said loose
wheel imparts, through the ratchet wheel having the greater number of teeth, a
slow rotary motion to the shaft carrying the roll, so that a helical groove of the
desired pitch is cut upon the latter. On the backward motion of the planing
machine bed, the loose wheel, by means of the second ratchet wheel, imparts a
rotary motion in the contrary direction to the shaft and roll, thus turning the
latter back again, but to a less extent than the forward turn, owing to the less
number of teeth of the second ratchet, and thus the roll is brought into such a
position that the cutting tool will, at the next forward motion, groove the roll at a
certain distance from the first groove, such distance being capable of accurate
adjustment by varying the difference between the two ratchet wheels.
Or, according to another arrangement, the loose wheel is made to gear, through a
second set of change wheels, with a second pinion in gear with the before-mentioned
rack, such change wheels being so proportioned as to turn the loose wheel through
a somewhat less distance on the back motion of the planing machine bed, than the
first set of change wheels turns it on the forward motion. In this case both the
ratchet wheels have the same number of teeth, and the pawl actuating the one
ratchet wheel is thrown out of gear while the other is in gear. Or, in place of
actuating both ratchet wheels by one and the same loose wheel, the ratchet wheels
may be arranged on separate shafts with two loose wheels, the one being actuated
by means of the one set of change wheels and the other by the second set, and, in
this case, there may be two shafts carrying two rolls to be grooved arranged side
by side, and one ratchet wheel and loose wheel may be geared to each of the shafts,
which are then geared together in such manner that the rotary motion imparted to
the one roll is also imparted in the same direction to the other. This arrangement
of imparting motion simultaneously to two rolls situated side by side may also be
applied to the first described arrangement the two shafts being geared together, so
as to revolve in one and the same direction

page_text: A A¹ are two spindles with suitable chucks B for supporting and rotating two
rolls to be grooved. On the spindles are fixed spur wheels CC gearing with
worms D D' on shafts E E', which, together with the bearings for the spindles A A',
are mounted upon a slide F moved to and fro' on an ordinary lathe bed G.
On the shaft E is a loose spur wheel H between two fixed ratchet wheels I and I¹.
The ratchet wheel I has a number of teeth corresponding to the number of grooves
to be cut on the roll, and it is driven by the wheel H by means of a pawl thereon
when this is rotated in the direction of the arrow fig. 1 thereby also causing the
shaft E to be rotated in that direction. The ratchet wheel 1' has an optional
number of teeth, such as five, as shewn on the drawing, and is carried round
together with the shaft E by the wheel H by means of the pawl K. thereon, when
this is rotated in the reverse direction of the arrow. The wheel H gears with a
toothed wheel L fixed on a sleeve M revolving ou a pin M¹ carried by the slido F,
and a pinion N also fixed on the sleeve M, gears with a rack O fixed to the lathe
bed. Thus it will be seen that as the slide F is made to travel along in the
direction of the arrow, the pinion N being rotated by the rack O will cause the
wheel H to be driven in tho direction of the arrow whereby the ratchet wheel I
will be made to drive the worm D in the same direction, causing the spindle A and
its roll to be rotated slowly in the direction of the arrow fig. 2 as they travel
along, and the fixed cutting tool will thus be made to cut the required helical
groove upon the roll. On moving the slide together with the roll in the contrary
direction for bringing the roll back, preparatory to cutting the next groove, the
pinion N, will cause the wheel H to be rotated in the direction contrary to the
arrow, and consequently, by means of the pawl K and ratchet wheel 1' to rotato
the spindle A and its roll also in the contrary direction, thereby bringing the roll
back again to its former position. On a bar P fixed to the lathe bed are one or
more adjustable stops P', which as the wheel H and its pawl K travel past it, come
in contact with the tail of the pawl and raiso this out of gear with the ratchet.
By this means, as the pawl revolves with the wheel H, it is made to miss one or
more teeth of the ratchet wheel 1, and consequently during the longitudinal
backward motion of the roll, this is turned back on its axis to a somewhat less
extent than it was made to revolve during the forward motion, thereby bringing it
into position relatively to the cutter for cutting the next groove thereon. It will
be seen that according as there are one, two, three or more stops P', causing the
pawl to miss one, two, three or more teeth of the ratchet wheel during the entire
backward motion, so will the intervals between the consecutive grooves of the roll
be made greater or smaller. In place of the bar P and stops PT may be employed
a cap Q, fig 3, carried by the slide F and enclosing the ratchet wheel I', and
provided with any desired number of screwed stops Q, by screwing one or more of
which inwards into the path of the tail of the pawl this will be thrown out of genr
with the ratchet wheel at one or more points of its revolution.
The second spindle A' and its roll are rotated in the same direction and in the
same manner as tho spindle A by means of a toothed wheel R on shaft E driving a
toothed wheel S on shaft E¹ through an intermediate wheel T.
By changing the wheel L for ono of larger or smaller diameter, the grooves cut
on the rolls may be made of greater or less pitch, and by shifting the wheel L and
pinion N to the opposite side of the wheel IJ, the grooves will be cut on the rolls
in the reverso direction. For this purpose, the pin M' is fitted with a T bead in a
longitudinal groove U in the slide, so as to be capable of being shifted to any
desired position, in which it is securely held by the nut M².
Having thus described the nature of my invention and in what manner the same
is to be performed, I claim:-
First In machinery for helically grooving rolls, imparting rotary motion
alternately in contrary directions to the rolls by means of a toothed wheel loose
on a shaft driving the roll, which wheel carries two pawls gearing with two
ratchet wheels fixed on the said shaft and so arranged that the rotation of the
toothed wheel in one direction causes the one ratchet wheel to rotate the roll

page_text: through a somewhat less angle in the backward motion than the angle through
which the other ratchet wheel is made to rotate the roll in the forward motion,
when the toothed wheel is rotated in the other direction, substantially as herein
described.
Second: In machinery for helically grooving rolls, the combination of the rack O,
pinion N and wheel L with the wheel H loose on shaft E, to which it imparts
motion alternately in contrary directions for actuating the roll, through the ratchet
wheels II', arranged and operating substantially as herein described.
In Witness whereof, I the said David Burr have hereunto set my hand and seal
this Sixth day of May in the year of our Lord, one thousand eight hundred and
eighty-four.