Improvements in Screwing and Turning Machines.
Year: 1899

page_text: ROVISIONAL SPECIFICATION.
Improvements in Screwing and Turning Machines.
I, JOSEPH BARROW, of the Firm of T. Shanks and Company, of the Union
Iron Works, Johnstone, in the County of Renfrew, North Britain, Engineer,
do hereby declare the nature of this invention to be as follows, that is to say:-
My said invention relates to screwing and turning machines to some extent
of the kind described in my Patent Specifications No. 3199 of 1872, and No. 5241
of 1883, and has for its object to improve certain parts of such machines, and
to facilitate the operations in an accurate and satisfactory manner, when screw-
ing or turning shafts of considerable length.
In a machine made with my present improvements the cutters or screwing
dies are adjustably held in a rotating die box driven in any usual or convenient
way, and the work--that is the shaft to be screwed or turned is moved longi-
tudinally without rotating. One end of the work is held by gripping jaws in
a head upon a transverse saddle movable on lateral longitudinal guides; and
this saddle is connected by lateral rods to a cross stay or saddle moving on
lateral longitudinal guides at the other end of the machine. The last-mentioned
cross stay or saddle is bored to receive a tubular box constructed for holding
and adjusting a rod at the inner end of which is a centre to bear against the
end of the work opposite to that hereinbefore said to be held by gripping jaws;
and it follows that as the two saddles move together the work (after adjustment)
is rigidly held throughout its longitudinal movement.
ment is imparted to the saddles by means of a
The longitudinal move-
to suit the pitch of the work to be screwed or turned.
guide screw and change wheels
The tubular box for holding the centre rod is provided with a screw spindle
nd hand wheel and the tube carrying the centre is thereby made movable for
djustment so as to hold rigidly the work under operation and in combination
ith the guide screw to secure a correct and continuous gauge of thread. The
hole of the details are open to view and readily understood by the attendant.
When a certain length of the work has been screwed or turned, the box is dis-
onnected from the tube and rod end, and is moved inwards a distance corre-
onding to the portion of the work so far screwed or turned; and thereafter
rain moves outwards with the work whilst a second length of the work is being
rewed or turned. With these improved details the screwing and turning
tion is made accurately continuous from length to length of the work, there
ing no break nor necessity for readjustment, when passing from one length
the next.
Dated this Twenty-fourth day of Tul.
1000

page_text: Improvements in Screwing and Turning Machines.
I, JOSEPH BARROW, of the Firm of T. Shanks and Company, of the Union
Iron Works, Johnstone, in the County of Renfrew, North Britain, Engineer,
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, that is to say:-
:-
My said invention relates to screwing and turning machines to some extent
of the kind described in my Patent Specifications No. 3199 of 1872, and No. 5241
of 1883, and has for its object to improve certain parts of such machines and
to facilitate the operations in an accurate and satisfactory manner, when screw-
ing or turning shafts of considerable length.
In a machine made with my present improvements the cutters or screwing dies
are adjustably held in a rotating die box fitted to a hollow mandril, driven in
any usual or convenient way (for example by belt and spur gearing), and the
work or shaft to be screwed or turned is moved longitudinally without rotating.
One end of the shaft is held by gripping jaws in a head upon a front transverse
saddle movable on lateral longitudinal guides, and this saddle is connected by
lateral rods to a back cross stay or saddle fitted to move in lateral longitudinal
guides simultaneously with the front saddle, movement being imparted to the
saddles by a guide screw driven by change wheels, acting on the front saddle.
The other end of the work or shaft to be operated on, that is the end opposite
the gripping jaws, is held by a centre fitted to the end of a centre rod having
its other end fitting in the back saddle so that the rod and holding centre may
be easily and accurately adjusted by the machine attendant.
My invention relates principally to improvements in the parts for adjusting
the holding centre, and in carrying it out the back saddle is fitted with a box
or tube fitted with a bearing piece or bush for holding the back end of the
centre rod, the bearing piece having its inner end formed to act on the rod
so as to move it on end to adjust the holding centre, an outer end nut being pro-
vided on the rod for adjusting the end of the rod within the bearing piece.
The tube and bearing piece are connected together, and longitudinal adjust-
ing movement is imparted to the rod by a handled screw spindle connected
to the tube and back saddle. When the parts have been adjusted with the
holding centre bearing properly against the end of the work, it follows that as
the two saddles move together the work is rigidly held throughout its longitudinal
movement.
During the movement of the machine the centre rod rotates with the hollow
mandril, being connected to it by a turning piece which is keyed to the rod
and to the mandril. When a certain length of the work has been screwed or
turned so that the back saddle has reached the outer limit of its guides, the
adjusting parts on the saddle are disconnected and the saddle with its tube (the
bearing piece being left on the end of the rod) is moved the requisite distance
inwards towards the mandril, the inner end of the tube being arranged to butt
up against the turning piece which has its inner end now bearing against a
shoulder on the centre rod. The holding centre is adjusted and made to bear
properly against the work by moving the tube which acts on the turning piece
and centre rod, the tube being moved by a screwed spindle provided with a
small turning head instead of a handwheel as formerly. When the machine
is started the saddles move together as before, but the centre rod does not
rotate with the mandril as the turning piece has been disconnected from the
mandril by the action of the shoulder on the centre rod.

page_text: that my said invention and the manner of performing the same
may be properly understood I hereunto append two sheets of explanatory draw
ings to be hereinafter referred to in describing the improvements.
Figure, 1, on Sheet, 1, of the drawings is a plan partly in section of a
5 machine provided with my improvements. Figure, 2, is a similar view of a
portion of the machine. Figures, 3, and 4, on Sheet, 2, are vertical sections. ou
an enlarged scale of the improved parts. In these drawings the same refer-
ence letters and numerals are used to mark the same or like parts wherever
they are repeated.
()
In a machine made with my present improvements as shown in the drawings
the cutters or screwing dies, A, are adjustably held in a rotating die box, A 1,
fitted to a hollow mandril, B, and driven by belt and spur gearing, A2, A3,
the work or shaft, C, to be screwed or turned being moved longitudinally with-
out rotating. One end of the shaft is held by gripping jaws, D, in a head, 11,
upon a front transverse saddle, D2, movable on latéral longitudinal guides, E1,.
and this saddle is connected by lateral rods, D3, to a back cross stay or saddle, G,
fitted to move on lateral longitudinal guides, E2, simultaneously with the front
saddle, D2. The back saddle is fixed in position on the rods, D3, by screw
bolts, D4, which clamp the bearing parts of the saddle upon the rods. Move-
ment is imparted to the saddles by a guide screw, H, which acts on the front
saddle, D2, being driven by change wheels which are not shown. The other
end of the work or shaft, C, opposite to that held by the gripping jaws, D, is
held by a centre, J, fitted in the end of a centre rod, J 1, so as to bear against
the end of the work. The rod, J 1, has its other or outer end fitting in the back
saddle, G, and the holding centre, J, and the rod, J 1, can be easily and accurately
adjusted by the machine attendant. The back saddle, G, is fitted with a box
or tube, G 1, within which is also fitted a bearing piece or bush, G2, for hold-
ing the outer end of the centre rod, J 1. The bearing piece is formed with a
tapered inner end to bear against a correspondingly conical shoulder part of the
rod, J1, and it is fixed to the tube, G1, by a cross key or pin, G3, an outer
end nut, J2, being provided on the rod for holding and adjusting the end of
the rod within the bearing piece. The tube is provided with a handled screw
spindle, K, one part, K1, of whch is formed with collars, K2, to work in a
fork bearing, K3, on the tube the screwed part, K4, of the spindle working in
correspondingly screwed part of the saddle.
by means of the handwheel, K 5, movement is imparted to the tube, G1, and
On turning the screw spindle, K,
onnected bearing piece, G2, the bearing piece acting on the centre rod, J 1,
o as to move it longitudinally and adjust the holding centre, J, so as to cause
to hear against the end of the work, C, in the manner required. The centre
od, J1, is arranged to rotate with the mandril, B, being connected to it by
turning piece, L, which has a key, L1, fitted to work in a groove, L2, in the
d, and a tappet key, L3, which engages in a short groove, L 4, formed in
e end of the mandril. When a certain length of the work or shaft, C, has
en screwed or turned so that the back saddle, G, has reached the outer limit
its guides, E 2, the machine is stopped and the box or tube, G1, is disconnected
om the bearing piece, G2, by withdrawing the cross key, G3, the handled
ew spindle, K, being likewise disconnected from the tube and saddle. The
mping screws, D4, are then slackened and the back saddle with its tube, G 1..
moved the requisite distance inwards towards the mandril and fixed so that
inner end of the tube butts up against the outer end of the turning piece, L,
ich has now been moved outwards by the action of a' shoulder, J3, on the
tre rod, J 1, so as to place the tappet key, L3, on the turning piece out of
tact with the groove, L4, in the mandril, as shown in Figures, 2, and 4.
turning piece, L, is thus held between the shoulder, J3, and the inner
of the tube, G1, which supports the centre rod, J 1. The holding centre, J,
djusted and made to bear properly against the work, C, by moving the
, G1, which acts on the turning or connecting piece,. L, and centre rod, J 1.

page_text: ..
the tube being moved by means of a screwed spindle, M, applied to the tube
and saddle in the same manner as formerly described the spindle being however
formed of necessity with a small turning head or handle, M 1, instead of the
ordinary handwheel, K5. The screw spindles, K, M, and cross key, G3, when
not in use are placed respectively in sockets or holders, N, N1, N2, provided
for them on the top of the saddle, G. When the machine is started again the
saddles move together with the work as before and the cutters or screwing
dies, A, in the rotating die box, A 1, operate on a second length of the work or
shaft, C, being screwed or turned. The centre rod, J 1, however does not rotate
during the second movement of the machine as the turning piece, L, as pre-
viously described, has been placed so that the rotating mandril, B, cannot act
on it to turn it.
Important advantages are obtained by the use of the hereinbefore described
improvements which are specially noticeable in long screwing and kindred
. operations, the screwing and turning action being made accurately continuous
from length to length of the work, there being no necessity for the work leav-
ing the centres until it is completed.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim s
In screwing and turning machines, improvements admitting of successive
lengths of a shaft or piece of work being screwed or turned in an accurately
continuous manner and comprising an adjusting box or tube fitted in a back
saddle movable in guides, and adjustably connected to a similarly guided front
saddle acted on by a guide screw suitably driven, a bearing piece or bush fitted
within and keyed to the tube and formed to hold and act longitudinally on the
outer adjustably-fitted end of a centre rod having a holding centre at its inner
end to hear against the work or shaft to be screwed or turned, the other end of
the shaft being held by gripping jaws in the front saddle, the parts being con-
structed arranged and operating substantially as and for the purposes herein-
before described with reference to the accompanying drawings.
Doted this Tonic thinl day of dril 1900