Improved Machine for Screw-threading Rods or Wires such as Cycle-wheel Spokes or the like.
Year: 1897

page_text: Date of Application, 3rd May, 1897
Complete Specification Left 10th Dec. 1897 Accented 3rd May 1808
Date of Application, 3rd May, 1897
Complete Specification Left 10th Dec. 1897 Accepted 3rd May, 1808
Improved Machine for Screw-threading Rods or Wires such as
Cycle-wheel Spokes or the like.
I, CARL RODERT BRUNO NAUMANN, of Am Priesznitzerschlage, Dresden, in the
German Empire, Manager of the Firm styled "Nahmaschinenfabrik und
Eisengiesserei vorin. Seidel & Naumann," do hereby declare the nature of said
invention to be as follows:-
.
This invention relates to a machine for screw-threading rods or wires such as
cycle-wheel spokes or the like; the spokes or rods being automatically conveyed to
a retaining device in which they are locked in position for screw threading and
from which, after being threaded, they are released and conducted out of the
machine.
In this machine motion is imparted to the feeding and locking mechanisms,
through the medium of driving straps or belts, from a main shaft, which, through
the agency of a worm and worm wheel, drives another shaft. The continuous
motion of this shaft is, by means of a cam, a connecting rod or link, a swinging
lever and a pawl and ratchet wheel, converted into a step-by-step motion of a third
shaft. This shaft is arranged underneath a spoke or rod holder, in the guiding
slots of which the spokes or rods to be screw-theaded are placed one above the other.
Below the said guiding slots of the holder, there are provided on the third shaft a
number of notched discs, in the notches of which, after each of the intermittent
movements of the third shaft, the spokes or rods successively take up their position.
The spokes or rods thus carried by the notched discs are retained therein by springs
extending over about one-fourth of the peripheries of the said discs and are in this
position conducted downwards; whereupon they drop upon inclined plates along
which they, each in succession, slide down into a retaining or locking device the
retaining cheeks or jaws of which are operated from the second shaft through an
eccentric, acting in conjunction with a lever and eccentrics, co-operating with bell
crank levers.
After a spoke or rod has been properly locked in position in this mechanism, the
screw-threading mechanism, in its turn, comes into operation.
The cutter spindle of this mechanism, arranged in a line with the spokes or rods
when locked in position as stated, carries two strap-pulleys adapted to revolve
therton. These strap-pulleys which are rotated in opposite directions by driving
straps, move in close proximity to the bearings of the spindle, so that their extent
of displacement on the said spindle is limited by its bearings. Between the two
driving pulleys a friction roller is mounted on the said spindle, in a position enabling
it to be shifted thereon in the longitudinal direction. A forked lever, the opposito
end of which engages with a cam on the second shatt is adapted alternately to press
the said friction roller into contact with either one or the other of the driving pulleys
with the result that they are rotated by frictional contact and that the cutter
spindle is rotated alternately in one and the other direction.
Supposing a right-hand screw-thread is required, the cutter spindle being

page_text: accordingly turned to the right; then a spring, operated by a cam on the second
shaft, will move the cutter spindle, carried by a slide, forward towards the spoke
or rod locked in position in the retaining device; so that the cutter-head secured
to the end of the said spindle is passed over the extremity of the spoke or rod and
made to cut the required screw-thread thereon. When the cutter spindle has
advanced a sufficient distance for a screw-thread of the requisite length to be pro-
duced, the first named cam on the second shaft acting through the medium of the
forked lever, moves the friction roller from the pulley serving to effect right-hand
rotation to the pulley which produces rotation in the opposite direction, pressing it
against the latter; the cutter spindle being, in consequence, turned to the left,
while owing to the shape of the other cam on the second shaft this spindle recedes,
thereby causing the cutter-head to set free the spoke or rod which it has threaded.
Under the action of the eccentrics and the levers before mentioned, respectively,
the locking or retaining device is at this juncture re-opened, and the finished spoke
or rod drops through a slot provided for the purpose in the supporting plate or
table into a receptacle arranged underneath, while the next-following spoke or rod
slides down the inclines and in its turn takes up its position in the locking or holding
device to be screwed as before.
1001
Improved Machine for Screw-threading Rods or Wires, such as
Cycle-wheel Spokes or the like.
I, CARL ROBERT BRUNO NAUMANN, of Am Priesznitzerschlage, Dresden, in the
German Empire, Manager of the Firm styled "Nahmaschinenfabrik und
Eisengiesserei vorm. Seidel & Naumann," 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:-
This invention relates to a machine for screw-threading rods or wires such as
cycle-wheel spokes or the like, the spokes or rods being automatically conveyed to
a retaining device in which they are locked in position for scrow threading and
from which after being threaded they are released and conducted out of the
machine.
In the accompanying drawings, a machine constructed in accordance with this
invention is represented in Figures 1 to 4, being respectively a front elevation, a
plan and two side elevations.
In this machine motion is imparted to the feeding and locking mechanisms,
through the medium of driving straps or belts, from a main shaft I, Fig. 1 to 3,
which, through the agency of a worm, and worm-wheel, drives another shaft II.
The continuous motion of this shaft is, by means of a cam ia connecting rod or
link k, a swinging lever m and a pawl and ratchet wheel o, converted into a step-
by-step motion of the shaft III (Fig. 1 to 4). This shaft III is arranged under-
neath a spoke or rod holder a, in the guiding slots of which, the spokes or rods d
to be screw-threaded are placed one above the other. Below the said guiding slots
of the holder a, there are provided on the shaft III notched discs 2, in the notches
of which, after each of the intermittent movements of the shaft III, the spokes or
rods successively take up their position. The spokes or rods thus carried by the

page_text: notched discs P are retained therein by springs p² extending over about one-fourth
of the peripherics of the said discs, and are in this position conducted downwards;
whereupon they drop upon inclined plates 9 along which they, each in succession
slide down into position between the jaws c c of a locking device and between
standards onto bolts or supports c which project respectively through the
movable jaw c¹ of the locking device and through the standard c. The bolt or
support in the jaw c¹ slides in a socket carried by the said jaw and is forced for-
ward by a
spring Figuro 6, a similar spring e l'igare 7 pressing forward the
bolt or support ex carried by the standard so as to cause the said bolts to project
into position to receive the spokes. When a spoke is in position on the bolts or
supports the movable jaw cl of the locking device is caused to move forward
towards the stationary jaw c so as to grip and securely retain the spoke in position
between the jaws while the screw threading of the spoke is effected. The forward
movement of the jaws c¹ is effected by a lever g' actuated by a cam disc g as shewn in
Figure 5 and as the bolt or support c* in the jaw c¹ is normally pressed against
the stationary jaw c by the spring the said movable jaw being attached to the
socket containing the spring further compresses the said spring so that when the
pressure of the lever g¹ is removed from the jaw c¹ the recoil of the spring c forces
the jaws of the locking device apart.
When a spoke or rod has been properly locked in position in this mechanism,
the screw-threading mechanism, in its turn, comes into operation.
T
The cutter spindle IV, arranged in a line with the spoke or rods when locked in
position as stated, carries two strap-pulleys adapted to revolve thereon. These
straps-pulleys which are rotated in opposite directions by driving straps, move in
close proximity to the bearings of the spindle IV, so that their extent of displace-
ment on the said spindle is limited by its bearings. Between the two driving
pulleys and a friction roller fis mounted on the said spindle IV, in a position
enabling it to be shifted thereon in the longitudinal direction. A forked lever f¹
(Figures 2 and 8), the opposite end of which engages with a cam 6 on the shaft II
(a development of which cam is shown in Fig. 8) is adapted alternately to press
the said friction roller, which is connected to the shatt IV by groove and tongue
connection, into contact with cither one or the other of the driving pulleys r r with
the result that they are rotated by frictional contact and that the cutter spindle IV
is rotated alternately in one and the other direction.
Supposing a right-hand screw-thread is required, the cutter spindle IV being
accordingly turned to the right; then a spring-levers (Figures 2, 3 and 9), operated
by the came on the shaft II, (a development of which cam is shewn in Fig. 9*)
will move the cutter spindle IV, carried by a slide, forwards towards the spoke or
rod locked in position in the retaining device; so that the cutter-head secured to
the cud of the said spindle is passed over the extremity of the spoke or rod and
made to cut the required screw-thread thereon. When the spindle IV has advanced
a sufficient distance for a screw-thread of the requisite length to be produced, the
cam 6, acting through the medium of the lover fi, moves the friction roller f from
the pulley, serving to effect right-hand rotation, to the pulley which produces
rotation in the opposite direction, pressing it against the latter; the cutter spindle
being, in consequence, turned to the left, while owing to the shape of the cam e
actuating the spring-lever s this spindle recedes, thereby causing the cutter-head
to set free the spoke or rod which it has threaded.
Now the forward end of the lever q² enters a recess g³ of the disc g (Figure 5)
and releases the movable jaw c' of the locking device, and the projecting supports c
are at the same time moved from beneath the spoke by connecting rods (Fig. 2, 6
and 7) and bent lovers 13 actuated by cam discs h h which are fixed on the
shaft II. In this position of the locking device the spoke falls through a slot of
the table into a receptacle arranged under this slot, and after the cams of the
discs h h have released the bent-levers 7 l, the bolts or supports c*, by the action
of their springs, are driven back into the position in which the locking device is

page_text: ready for the reception of the next spoke which is delivered to it by the notched
discs p.
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 :-
In a machine for screw-threading rods or wires such as cyclo-wheel spokes or the
like the combination of a shaft (II) imparting an intermittent rotation to a feeding
shaft (III) provided with notched discs (p) for the purpose of conveying the spokes
or rods singly from a holder (a) to a locking and retaining device (c) with a cam (b)
on the shaft (III) to cause the direction of rotation of a cutter spindle (IV) to be
reversed by means of a lever (f¹) and a friction roller (f), while through the agency
of another cam (e) on this shaft and a spring (s) the cutter spindle is displaced
longitudinally, substantially as described.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.