IMPROVEMENTS IN LATHES FOR CUTTING SCREWS AND OTHER FIGURED ARTICLES to be às follows:
Year: 1884

page_text: [Communicated from abroad by Heinrich Voigt, Engineer, a person resident at
Würzburg, and Wunibald Braun; a person resident at Frankfort-on-the-Main,
in the Empire of Germany.]
J, FRANK WIRTH, of the firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main in the Empire of Germany do hereby declare the nature of
said invention for "IMPROVEMENTS IN LATHES FOR CUTTING SCREWS AND OTHER
FIGURED ARTICLES to be às follows:-
"
The improved automatic lathe is constructed in such a manner that it produces
turned articles of the most varied sizes and shapes, as well as, all sorts, sizes and
kinds of screws,
all these articles being produced continuously from bars or rods of
different materials such as iron, steel, or brass. The machine is further constructed
in such a manner that, four or more of the before named articles can be simul.
taneously, made on one machine, that is to say, the machine operates on four bars
of material, more or less, at the same time and in the same manner.
The said lathe is constructed as follows, that is to say, a head-stock is provided
having four hollow mandrils, resting in suitable bearings on said head-stock; these
mandrils have self-centreing chucks at their ends which project beyond 'their
respective bearings, and serve to hold the rods or bars, thus causing them to
revolve with their respective mandrils while they are being operated upon.
The head-stock is connected to a lever attachment by which it can be moved
along the bed of the lathe, towards, or away from, the cutters, hereinafter described.
This horizontal movement of the head-stock takes place at the same time that the.
mandrils are rotating.
On the lathe-bed is also situated the tool-holder provided with four sets of cutters,
which according to the movement of the tool-holder are brought to bear against
the work, one after the other. The mechanism which operates the tool-holder is
arranged in such a manner that, this latter always moves in a horizontal direction
and never receives a rotatory motion.
The tool holder however can not only be arranged to have a transverse movement
with regard to the axis of the mandrils, but the head-stock may some times remain
stationary and the tool-holder, together with its rest, be moved longitudinally.
[Priss £11

page_text: The head-stock is moved by a lever actuated by a connecting rod which in its
turn is moved by a cam through a cross head working in guides.
The point of connection between the connecting rod and the lever before named
can be adjusted according to desire by raising and lowering the guide, whereby a
reciprocating motion is imparted to the head-stock within certain limits; on this
motion, or upon the corresponding motion of the tool-holder, depends the size of the
screws or other articles, manufactured on the machine.
m
The further adjustment is effected by the use of change-wheels. Suppose that an
article of 20 in length is to be turned, the head-stock-lever is set in such a manner
that the head-stock only moves 10™/m, then this length of 10 would take just as
long to turn as is required for the original length of 20/m. But if by means of
change wheels double the velocity be given to the cam then articles half the size
will also be produced in half the time by the same cams.
The actuating mechanism consists of a system of cams, fixed on a spindle, the
said cams transmitting the prescribed movements to their respective parts by means
of levers.
For various kinds of screws and other articles different cams are required; they
are therefore arranged to be interchangeable.
The cam spindle is driven by a worm and wheel, from a second spindle, driven by
change-wheels by a third spindle which also drives the mandril and cutters and is
itself driven direct from the communicator.
Opposite each mandril, and. in the same axial line, a screw-cutting device is
situated. The screw-cutting heads are carried in suitable bearings in the rigid-tail-
stock, and are made to rotate, by a belt pulley working in a friction-clutch, and
operating on each by means of a central toothed wheel.
The screw-threads are cut either with a common screw plate or with dies. It
will be understood that it is immaterial if the work revolves and the cutters remain
stationary or, vice versa; the direction however in which rotation takes place is
dependent upon the thread being right or left.
The removal of the screw from the cutters is effected by running the machine in
the opposite direction.
It will be observed that in the above description the improved lathe is described
as being constructed with only four mandrils, and an equal number of sets of cutters,
and screwing apparatus, I do not however confine myself to this number, but
construct lathes according to this invention which produce more than four similar
articles at one time. This is accomplished by increasing the number of mandrils
and with them the number of sets of cutters and screwing apparatus.
1004
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: I, FRANK WIRTH, of the firm of Wirth and Co, Patent Solicitors, Frankfort-on-
the Main, in the Empire of Germany, do hereby declare the nature of my invention
for "IMPROVEMENTS IN LATHES FOR CUTTING SCREWS AND OTIIER FIGURED
ARTICLES and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
"
This invention relates to lathes for cutting screws and other articles.
The improved lathe is constructed in such a manner, that it produces turned
articles of the most varied sizes and shapes, as well as, all kinds of screws, these
articles being produced continuously from bars or rods of different materials such
as iron, steel or brass. The machine is further constructed in such a manner that,
four or more of the before named articles can be simultaneously made on one
machine, that is to say the machine operates on four bars of material, more or
less, at the same time and in the same manner.
In the accompanying drawing
Figure 1 is a front elevation of the improved machine.
Figure 2 is an end view, and
Figure 3 is a plan of the same.
Figure 4 is a sectional view of one of the hollow mandrils hereinafter described,
drawn to an enlarged scale, and
Figure 5 is an end view of the same.
Figure 6 is an edge view of the tool holder, and
Figure 7 is a side view of the same.
For
The improved machine is designed for operating upon several rods of metal
simultaneously with the object of producing articles such as screws, pins, etc.
this purpose the headstock A, figure 1, is, in the present case, arranged for the
reception of four mandrils a' a² a³ at; these mandrils being drilled through
longitudinally to permit free passage of the wires.
Each of these mandrils at its front end carries a device which centres the rod
and holds it so that it is compelled to join in the rotation of the mandril.
The entire headstock is adapted to be moved by the lever y in the direction of
the mandril towards and from the tools in the tool-holder C secured to the
transverse slide-rest B.
By means of this longitudinal motion, and by suitable lateral motions, the wires
are caused to undergo the required operations.
In the arrangement shown in the drawing the slide-rest can only make trans-
verse motions, as described, relatively to the mandrils.
The headstock may, however, be made stationary and the slide-rest together
with the tool-holder have the necessary longitudinal and transverse motions
relatively to the rotating rods, imparted to it.

page_text: Opposite each of the said mandrils is another mandril which carries at its end a
device designed to cut a screw-thread upon the rod after it has been operated upon
by the cutters.
Motion is imparted to the mandrils through the cone-pulley p, upon one end of
the shaft u, upon the other end of which is the cord pulley o. This pulley through
a cord transmits its motion to the cord-pulley m which, through the medium of
the friction-clutch, imparts motion to the toothed wheel and through this to
the toothed wheels Z1 Z2 Z3 Z and thus to the four mandrils.
The friction-clutch is moved to the right and to the left by means of a cam and
the levers and v². The clutch is connected by a rod w with the clutch k³.
When the clutch k is pushed to the right, the four mandrils Z' Z Z3 Z* rotate and
the rods are operated upon by the cutters while the screwing devices xx³ ³ 20
remain at rest; when however the clutches are moved in the opposite direction the
screwing devices rotate whilst the rods remain stationary.
The lever y which actuates the headstock receives its motion through a connecting-
rod q which is carried by an arm 7 and is driven by the cam H.
The point of attachment of the connecting-rod q in the slot of the lever y can be
arranged at will, whereby the headstock is caused to make motions of different
lengths so that the size of the screws may be regulated.
Motion is communicated to the different parts of the machine through a system
of cams and levers, the former being secured upon the axis N and driven through
the worm-gear wheel S.
In figures 4 and 5 I represent a self-centreing clamping device for the rods. The-
spindle head or mandril g supports the collar or sleeve c, which can be shifted by
the ring band lever a, and carries on three projections three set screws d. Within
the mandril is secured a collar f divided longitudinally in three places as shown in
Figure 5. To the end of the mandril are pivoted small levers e bearing upon the
arms of the collar f formed by the longitudinal cuts. When a movement of the
collar c to the right takes place, the said screws press upon the levers e, whereby the
latter are forced against the arms of the collar f pressing the teeth with which
they are provided into the rod which is to be held. When the sleeve c is moved in
the opposite direction the screws d slide off the ends of the levers e, whereby the
springy ends of the collar fare allowed to move back, and release the rod. By the
adjustment of the screws & the rod to be operated upon can be accurately centred.
Figures 6 and 7 show the tool holder which is provided with eight tools, two for
each mandril.
These tools, as shown in the drawing, are put in from the side, which is the only
means enabling the insertion of the tools situated on the interior side.
In the above description, the improved lathe is described as having only four
mandrils, and an equal number of sets of cutters, and screwing devices; I do not
lowever confine myself to this number as I may construct lathes according to this
invention, which produce more than four similar articles at one time. This is
accomplished by increasing the number of mandrils and with then the number of
sets of cutters and screwing apparatus.
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
First The lever y in combination with the connecting-rod q adjustable in the
slot, for obtaining longer or shorter movements of the headstock.
Second In the machine herein before described the connection of the two friction
clutches and by the rod w, in order to operate the said clutches alternately by
means of one cam.
Third In the machine herein before described the clamping and centreing device
described with reference to figures 4 and 5 of the drawing, which device, by means
of the set screws d and levers e presses together the springy ends of the collar ƒ
provided with teeth, thereby clamping the rod to be operated upon.

page_text: Fourth The tool-holder, represented in figures 6 and 7 so constructed that the
tools can be inserted laterally.
Fifth The application of any desired number of mandrils and cutters in two
headstocks placed opposite each other, the said mandrils being actuated by toothed
wheels and friction-clutches all as shown and described.
Bahis 9-11 T 100
HASELTINE, LAKE & Co.,
For the Applicant.