Year: 1899

page_text: I, JAMES BROCKIE, of 12, Tyson Road, Forest Hill, in the County of Kent,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to the construction of a turning lathe in such a manner
that a longitudinally turning or boring tool and two transverse cutting or facing
tools are caused to operate automatically on work held in a chuck on the
mandrel.
For this purpose, from the mandrel I drive by a belt and suitable gear a
drum on an axis parallel to the mandrel, and arranged under it. On this
drum is a helical cam which acts on a roller mounted on a bar sliding longi-
tudinally in guides in the mandrel head and having at its end a tool holder
carrying a suitable turning or boring tool. On the same drum are disc cams
which act on rollers mounted on transverse levers which are fixed on rocking
shafts and rock in planes at right angles to the mandrel axis and which carry
cutting or facing tools on their upper ends. The sliding bar and the transverse
levers may be moved in both directions by the cams, or they may be moved
only in the one direction when they are performing work, their back strokes
being effected by weights or springs. While the longitudinally moving tool is
turning or boring the exterior or interior of a piece of work held in the chuck,
the transversely moving tools, which are mounted at opposite sides of the work
may face or groove the work. The mandrel or drum may be provided with a
clutch which disengages it when the cam shaft has made a complete revolution,
so that the lathe is thus automatically stopped when the work is finished. I
provide means of moving the cams by hand so that I can move the tools to
position for beginning the work, and also means of coupling the rocking shafts
or either of them to the sliding har, so that they can he moved longitudinally
with it. I prefer to make one of the rocking shafts tubular so that a sliding
bar can pass through it for cutting screws, the rear end of the bar being engaged
with a pattern screw driven from the mandrel. The shaft itself may be used in
this way.
Dated this 27th day of February 1899

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
My invention relates to the construction of a turning lathe in such a manner
that a longitudinally turning or boring tool and two transverse cutting or facing
tools are caused to operate automatically on work held in a chuck on the
mandrel.
For this purpose I construct the lathe head as I shall describe referring to
the accompanying drawings.
Fig. 1 is a side view, Fig. 2 is a front view, Fig. 3 is a longitudinal section,
Figs. 4 and 5 are transverse sections respectively on the lines 4-4 and 5-5
of Fig. 1. The rear end view is shewn by Fig. 6. Fig. 7 is a horizontal section
on the line 7-7, shewing a modification, the two shafts being shewn in plan.
Fig. 8 is a separate side view of the cam. Figs. 9 and 10 are respectively side
and rear views of the transverse tool holders. Fig. 11 is an elevation of the
spindle and Fig. 12 is an end view of the clutching rod and its arms.
The lathe head a is bored to receive a sliding shaft b which carries the boring
or turning tool holder e clamped on, it and two side shafts d and e which carry
the transverse tool holder f made to opposite hands and clamped on the shafts d
and e.
Free on the shaft is a sleeve carrying a worm wheel g; two edge cams h, i,
and a helical cam j, against which bears a roller & mounted on a pin which is
secured in the shaft and which is pressed against the cam by a suitable spring
or by weight attached to the pin by a cord as indicated in Fig. 3. Against
the cam and i rollers mounted on crank armis m projecting from the shafts de
are pressed by springs or drawn by weights attached to the crank arms by cords
as indicated in Fig. 5. A pulley 'n driven by a band from a pulley o geared to
the mandrel has on its spindle a worm gearing with a worm wheel on a cross
spindle on which is a worm gearing with the worm wheel 7 which is thus
caused to revolve slowly driving the cams hij and so causing the shaft b to
move lengthwise towards the lathe head and the shafts de to rock bringing their
tool holders towards the lathe head, the backward movements of b d and e being
effected by the springs or weights as permitted by the cams. The worm wheel p
is engaged with the spindle g by a clutch in the groove of which engages a
fork which can turn on a longitudinally sliding spring rod s but must slide with
it. On this rod is fixed an arm that bears against the face of the worm wheel g
from one part of which projects a stud . When the wheel has made a
revolution the stud acting on the arm causes the rod s to turn partly round
and with it a handle fixed upon the rod, so that a stud on the boss of this
handle is brought round to face a notch w whereupon a spring pushes the
rods to the right disengaging the clutch and thus stopping the wheel
9 and
the cams hij until these are started again by pulling and partly turning the
handle w and thus again engaging the clutch r When is unclutched, 7 can
be turned by hand wheel q. The shaft or bar bis prevented from revolving by
having clamped on it an arm y which can slide along the shaft d.
This arrangement may be modified as shewn in Fig. 7 by making the tool
holder c with arms 2 embracing the side shafts, one of these arms being free to
slide along the shaft e or capable of being clamped to it, while the other arm z
is engaged between collars on the shaft d causing that shaft to travel with it
but allowing it to be turned by a cam or pattern so that the tool holder carried
on it may make a cut of a compound character.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is
1. A. self acting lathe having its head bored parallel to the mandrel to receive
three shafts, a middle shaft arranged to reciprocate longitudinally and carrying

page_text: a turning or boring tool holder, and two lateral shafts arranged to rock and
carrying holders for transversely acting tools, substantially as described.
2. For operating the three shafts above referred to, three cams caused to
revolve on the middle shaft as an axis by gearing driven from the mandrel,
substantially as described.
3. The self acting clutch gear for stopping the cams when they have made one
revolution substantially as described.
4. The modified arrangement of the three shafts described with reference to
Fig. 7.
ABEL & IMRAY,
Agents for the Applicant,