Year: 1887

page_text: I, EDWIN BLAKEY, of The Grange, Lightcliffe, in the County of York, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to turning and screw-cutting lathes of the kind or class
described in the specifications of former Letters Patent, dated 19th November, 1873,
No. 3757, 6th January 1880, No. 44, and 9th March 1881, No. 996.
In machines of this kind or class, there is a revolving chuck provided with
griping or friction devices which are automatically operated to grip the rod or bar
from which the screws are to be made and feed the said rod or bar forward, and,
when a screw has been formed, to release the said rod or bar and move backward prior
to again feeding forward the said rod or bar. The said machines are, moreover,
provided with one or more heads, turrets or tool-holders in each of which are secured
one or more cutting tools or dies. These heads or turrets are moved, at the proper
times, so as to bring their tools or dies successively into position to act upon the said
rod or bar for the purposes of shaping the end thereof, forming the screw-threads
thereon and cutting the finished screw from the said rod or bar.
In the said machines, as heretofore constructed, the turret which holds the tools or
dies for cutting the shank of the screw and forming the screw-threads thereon has
usually been provided with two tools or dies placed diametrically opposite each other.
It has, therefore, been necessary to turn the said turret half a revolution in order to
change the position of the tools. Moreover, the machine has usually been so
constructed that, after the metal rod or bar has been fed forward by means
of cams formed on or attached to a rotating cylinder, the two tools on the said
turret come into operation one after the other by means of cams formed on
or attached to another rotating cylinder, and then the finished screw or other
article is cut or severed from the bar or rod by means of a suitable tool.
Now the object of my present invention is to increase the efficiency of these
machines and make them work more rapidly than heretofore. For this purpose,
instead of allowing the said turret to make a complete revolution each time
the rod is fed forward, I duplicate or otherwise mutiply. the tools in the said
turret and I provide two or more sets of cams on the first named cylinder, so
ונ

page_text: that before each tool or each set of tools is brought into action, the metal rod
will be fed forward. It will thus be seen that, if only one tool in the turret is
required to complete the formation of a screw or other article, I can insert four tools
in the said turret and provide for effecting the necessary feeding of the rod or bar by
using four sets of cams on the feed-cylinder.
It is obvious that a corresponding number of sets of cams must be used for bringing
the cutting off tool into its operative position after each screw-shank has been formed.
If the said turret holds six or more tools and two of the said tools are required in
each complete operation, I provide for feeding forward the rod or bar three or
more times during each revolution of the said turret.
If only two tools are required in the turret say a tool for cutting the body or
shank of the screw or other article and a die for cutting the thread, I place the said
tools in adjacent spaces or holes in the turret, and not on opposite sides thereof as
heretofore.
Date : 01
1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: 8
I, EDWIN BLAKEY, of The Grange, Lightcliffe, in the County of York, 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:
My invention relates to turning and screw-cutting lathes of the kind or class
described in the specifications of former Letters Patent, viz :-No. 3757 dated 19th
November, A.D. 1873, No. 44 dated 6th January A.D. 1880, and No. 996 dated
9th March 1881.
In machines of this kind or class, there is a revolving chuck which is provided with
griping or friction devices designed to be automatically operated by means of a cam-
cylinder to grip the rod or bar from which the screws or other articles are to be made
and to feed the said rod or bar forward, and, when a screw or other article has been
formed, to release the said rod or bar and move backward prior to again griping and
feeding forward the same. The said machines are, moreover, provided with one or
more heads, rotating turrets or tool-holders, in each of which are secured one or more
cutting tools or dies. One of these turrets is arranged to move to and from the work
longitudinally or in a path in line with the axis of the rod or bar. The other turret
is arranged to move to and from the work in a path at right angles to the axis of
the said rod or bar. These heads or turrets are moved at the proper times, so as to
bring their tools or dies successively into position to act upon the said rod or bar.
In the said machines, as heretofore constructed; the longitudinally moving turret
is provided with only a single set of tools, and, after each feed movement or forward
movement of the metal rod or bar from which the screws or other articles are to be
made, the said turret is completely rotated to bring the tools therein into operative
position one after the other, and then the finished screw or other article is cut or
severed from the rod or bar by means of a suitable tool carried by the cross-slide or
transversely moving turret. It is evident that a considerable time is occupied in the
rotation of the said turret, and, in cases where only a few tools are required in the
longitudinally moving turret, the said turret has to be moved through a considerable
distance without any beneficial result; for instance, if two tools are inserted in
opposite sides of the said turret, it has to be rotated through an angle of 180 degrees
in each of its to-and-fro movements.
Now my present invention is designed to increase the efficiency of these machines
and to make them work more rapidly than heretofore.
In my improved turning or screw-cutting lathe, I employ a longitudinally moving
turret arranged to rotate upon or about its axis, and a cross-slide or transversely
moving turret, and I provide cam-cylinders for imparting reciprocating motion to the
said longitudinally moving turret and to the said cross-slide or transversely moving
turret, substantially as described in the said former specifications No. 44 and
No. 996.

page_text: Instead, however, of providing the longitudinally moving turret with a single set
of tools and so constructing the machine that this turret will make a complete revo-
lution each time the rod or bar is fed forward, I provide the said turret with two or
more sets of tools, and I duplicate or otherwise multiply the sets of cams on the feed-
cylinder, so that the metal rod or bar will be fed forward twice or oftener in each
revolution of the said turret. It will thus be seen that, if only one of the tools carried
by the longitudinally moving turret is required to complete the formation of a screw
or other article, I can insert four tools in the said turret and provide for effecting
the necessary feeding of the rod or bar by using four sets of cams on the feed-
cylinder. A corresponding number of sets of cams must be used for operating the
cross slide or turret carrying the cutting-off tool, so that, after each screw-shank or
the like has been formed, the screw or other article will be cut from the rod or bar.
When the said turret holds six or more tools and two of the said tools are required
in the formation of a screw or other article, I provide for feeding forward the rod or
bar three or more times during each revolution of the said turret.
When four tools are secured in the longitudinally moving turret and only two tools
are required in the formation of a screw or other article, say a tool for cutting the
body or shank of the screw and a die for cutting or forming the thread thereon,
I place the said tools in adjacent spaces or holes in the turret at right angles to each
other, and I duplicate the sets of cams on the feed-cylinder and the cams for operating
the cross-slide.
Moreover I modify the construction of the cam-cylinder for imparting reciprocating
motion to the carriage which supports the longitudinally moving turret, that is to say,
I duplicate or otherwise multiply the sets of cams used for this purpose. Moreover
I provide any well known means whereby the said turret will be turned through the
required angle in each to-and-fro movement thereof.
It is obvious that the number of sets of cams used on the several cam-cylinders
will depend upon the number of sets of tools in the longitudinally moving turret.
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 is :-
A turning and screw-cutting lathe of the kind or class above referred to, wherein
provision is made for feeding the rod or bar and cutting a screw or other article
therefrom twice or oftener in each revolution of the longitudinally moving turret,
substantially as hereinbefore described for the purpose specified.
Dale LIUS BI (13LY UI FUNG LOOL
Daten LIUS BI (SLY UPDR Loo
EDWIN BLAKEY.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.