Improvements in Machine Tools for Turning and Shredding Metals and other Substances.
Year: 1889

page_text: Date of Application, 24th Sept., 1889
Complete Specification Left, 24th June, 1890-Accepted, 26th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Machine Tools for Turning and Shredding Metals
and other Substances.
ROBERT ABRAM LEE, 76 High Holborn London W.C. do hereby declare the nature
of this invention to be as follows:-
My invention consists of an improved mechanical means of advancing a cutting
tool a uniform amount, to set the cut at each complete traverse of the tool along the
material it is acting upon. The invention is applicable to all lathes and machines in
which it is required to advance a transverse slide at each travel or longitudinal
movement of the main slido; so that in turning a revolving piece of metal (or any
other substance) the turning or wire produced, shall be of a mechanically uniform
size, obtained by the hereafter described means.
The longitudinal travel of the main slide may be made to reverse its traverse-at the
desired position by any of the usual methods; I make the transverse feed move in
one direction only (to set a fresh cut at each travel of the tool along the work) in the
following manner.
To the transverse slide I form or fix two racks having a defined number & pitch of
teeth, according to the size of wire and total amount of travel required, and I form
two fulcrums on the lower part of the slide rest, to oach of which I fit a lever with
one end terminating in a spring pawl and the other end attached to a connecting rod,
by a joint or pin, this connecting rod lays parallel to the direction of the travel of the
slide rest, and at, or about, right angles to the two levers. As the main slide travels
along at a defined position it comes into contact with a stop or block connected
with the reversing gear and at, or about, the same time one end of the connecting
rod comes into contact with a stop or a spring buffer placed in a suitable position to
move the link and the levers, a distance that shall advance the rack one or more teeth
as desired; the opposito lever and pawl receeding from the rack teeth and so getting
into position to repeat the movement, at the reversing of travel of the main slide;
these movements being repeated as many times as there are teeth on the racks. The
racks are set with their teeth at intermediate positions so that each tooth is acted on
by its pawl in the forward movement.
When the material to be operated on is made to revolve between centres, to more
completely secure the equal action of the tool-and prevent any error arising from
the improper adjustment of the work between the centres- arrange the movable
headstock in the following manner; I make the cylinder which carries the dead
centre separate from the nut it is actuated by, & connect the two together by a
spring, and insert stops and a feather and key to prevent the nut being revolved, or
moved, beyond a detormined distance, I also fix on the bed of the macliine a stop to
define the position of the movable headstock, so that the tension on the centre, & the
work through the action of the spring; is constant and not dependent on careful
adjustment by the attendant.
The usual set screw to fix the cylinder in its position is employed when required.
DL: 1
1000
COMPLETE SPECIFICATION..
Improvements in Machine Tools for Turning and Shredding Metals
and other Substances.
I, ROBERT ABRAM LEE of 76 High Holborn, London, W.C. Engineer do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
My invention consists of an improved mechanical means of advancing a cutting

page_text: tool a uniform amount to set the cut at each complete traverse of the tool along the
material it is acting upon. The invention is applicable to all lathes and machines in
which it is required to advance a transverse slide at each travel or longitudinal move-
ment of the main slide; so that in turning a revolving piece of metal (or any other
substance) the turning or wire produced shall be of a mechanically uniform size
obtained by the hereafter described means. The longitudinal travel of the main slide
may be made to reverse its traverso-at the desired position-by any of the usual
methods. I make the transverse feed move in one direction only (to set a fresh cut
at each travel of the tool along the work) in the following manner.
a.
To the transverse slide I form or fix two racks having a defined number and pitch
of teeth according to the size of wire and total amount of travel required, and I form
two, fulcrums on the lower part of the slide rest to each of which I fit a lever with one
end terminating in a spring pawl and the other end attached to a connecting rod, by
joint or pin, this connecting rod lays parallel to the direction of the travel of the
slide rest, and at, or about, right angles to the two levers. As the main slide travels
along, at a defined position,-it comes into contact with a stop or block connected
with the reversing gear and at, or about, the same time one end of the connecting
rod comes into contact with a stop, or a spring buffer placed in a suitable position to
move the link and the levers, a distance that shall advance the rack one or more teeth
as desired; the opposite lever and pawl receding from the rack teeth and so getting
into position to repeat the movement, at the reversing of travel of the main slide;
these movements being repeated as many times as there are teeth on the racks. The
racks are set with their teeth at intermediate positions so that each tooth is acted
upon by its pawl in the forward movement.
When the material to be operated on is inade to revolve between centres, to more
completely secure the equal action of the tool and prevent any error arising from the
improper adjustment of the work between the centres, I arrange the moveable head
stock in the following manner; I make the cylinder which carries the dead centre
separate from the nut it is actuated by and connect the two together by a spring, and
insert stops and a feather and key to prevent the nut being revolved or moved,
beyond a determined distance. I also fix on the bed of the machine a stop to define
the position of the moveable head-stock so that the tension on the centre, and the
work through the action of the spring, is constant and not dependent on careful
adjustment by the attendant. The usual set screw to fix the cylinder in its position is
employed when required.
Referring to the Drawings
Fig. 1, A is the bed, B fast headstock, C main slide, D cross slide, carrying cutting
tool, EE levers working on their fulcrums E¹ E, F F pawls, G G racks fixed to
cross slide D, H connecting rod the projecting ends of which engage with stops or
buffers fixed at any suitable position on the bed.
Fig. 2 shows the movable headstock partly in section.
A is the pedestal, B hand wheel, C screw, D nut, E E cylinder, F spring,
G G feather way and feather.
My invention is applicable to any machine tool or lathe, where it is required to
automatically put on a fresh cut at either end of the work; but more particularly for
turning or shredding lead in such form that it can be readily acted upon by acids or
alkalies for its reduction to white lead.
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. In a machine tool for automatically turning and shredding metals, the cross
feed actuated by levers and racks, substantially as described and shown in the
Drawings.
2. In a machine tool for automatically turning and shredding lead, for making
white lead, the combination of levers, racks and pawls for automatically setting the
cutting tool into action substantially as described and shown in the drawings.

page_text: 3. In the moveable headstock of a machine tool or lathe the divided cylinder,
with spring, feather way and feather, substantially as described and shown in the
drawings.
4. The general combination forming my improvements in machine tools for turning
and shredding metals substantially as described.
Dated this 23rd day of June 1890
ROBERT ABRAM LEE.