An Improved Apparatus for Registering Telephone Calls.
Year: 1893

page_text: Date of Application, 31st Jan., 1893
Complete Specification Left, 31st Oct., 1893-Accepted, 2nd Dec., 1893
PROVISIONAL SPECIFICATION.
An Improved Apparatus for Registering Telephone Calls.
I, LUDWIG KAIN, of 107 Grindelallec, Hamburg, in the Empire of Germany,
Manufacturor, do hereby declare the nature of this invention to be as follows :—
My invention relates to apparatus for registering telephone calls.
This apparatus enables the change of direction of the electric current by which
telephone calls are registered to be produced by means of a switch lever adapted
to be set to the characters or signs to be given at the call station.
The conductor of the local battery is divided into two branches, of which the
first conducts the current through the coils of one pair of electromagnets while
the second branch conducts current to a second pair of electromagnets. When the
first branch receives current in the manner hereinafter explained the first pair of
electromagnets attract an armature attached to a spring and carrying at its free
end two pawle. The pawls aro arranged to engage alternately with the teeth of
an escape wheel after the manner of an anchor escape movement and thus regulate
the rotation of the shaft of the said wheel, which rotation is caused by a cord with
n weight or other suitable means.
On the shaft of the escape wheel is provided a type wheel with the same number
of types as the escape wheel possesses teeth, so that each time the first pair of
electromagnets is energized the type wheel serving as au indicator is turned through
the space of one type. When the type designed for the printing and inked in a
suitable manner has arrived opposite the pad of an armature to be attracted by
the second pair electromagnets and attached to a spring it prints the characters
or signs upon a paper band moved intermittently below the said pad. The move-
ment of the paper band wound from a roller and passing between two guide rollers
is preferably effected by means of a weight fixed to the paper band by automatio
clamping tongs, the forward movement being regulated similarly to that of a clock
or watch escapement, which consists of two pawls connected with the armature of
the second pair of electromagnets and an escape wheel secured upon the axis of one
of the aforesaid guide rollers.
Whether the current of the local battery flows through the first branch or the
second branch of the conductor depends on which of two magnets attached to two
springs is repelled by the corresponding pole of one of a third pair of electro-
magnets placed opposite to the said magnets and actuated by means of the current
in the line wire. One of the said magnets is then forced against a contact-piece
included in the conductor of the local battery and designed to close the circuit.
The coils of this third pair of electromagnets are so arranged that poles of
unlike name are presented to the two magnets, while the magnets themselves
present their poles of like naune to the electromagnots. A change in the direction
of the current causes only that one of the magnets to be repelled opposite to
which is an electromagnet of the same name. This change in the direction of the
current is effected by means of a switch, which consists essentially of a lever
adapted to be turned upon a journal and two concentric sliding rings. One of
these rings is permanently in electrical connection with the positive pole of one
line battery, while the second ring is connected in the same manner with the
negative pole of a second line battery. The first or outer sliding ring is provided
at its upper surface with projections the number of which corresponds with that of
the types on the before-mentioned type wheel. Below the said switch lever a
sliding spring is provided which, on coming in contact with one of the projections
on the upper surface of the first sliding ring, causes the current of the first line
battery to flow through the line conductor to the third pair of electromagnets of

page_text: "
the telephone station called and through a wire to the earth plate. Such a
ulosing of the circuit always causes the cirquit of the local battery to be closed
once, so that after turning the switch lever round once, the aforesaid type wheel
will also occupy its initial position again. In order that this turning movement
may always take place in the same direction the first sliding ring designed for
closing the circuit is covered with a ring made of non-conducting material, and
baving its surface formed after the manner of ratchet wheel teeth; through this
ring of non-conducting material the projections on the first ring pass into the plane
of the teeth. Within the said two sliding rings of the awitch are provided the
characters or signs corresponding with the types on the type wheel in such a
manner that the position of the switch lever indicates which of the types on the
type wheel is just opposite the pad and ready to print from. In order that this
may take place the switch lever has to be turned so far that the aforosail sliding.
spring provided below the same is no longer in contact with the projection of the
first or outer ring, which corresponds with the character to be printed and remains
in the neighbouring space between the teeth of the insulating ring. When A knob
serving as a handle on the switch lever is pressed against the tension of a spring
towards the second or inner sliding ring designed for closing the circuit so far that
a pin provided in the said knob establishes, by means of a sleeve surrounding it,
electrical connection between the said first or inner ring and the switch lover, and
therefore of the second line battery with the third pair of electromagnets, the
printing of the corresponding type will take place as the armature of the second
pair of electromagnets is attracted. At the moment when the electrical connection
discontinues, owing to the knob being released, the paper band is caused to móve
forward.
When this apparatus is not in use the switch must of course be so placed that
the current in the line coming from any telephoue station can pass to the third pair
of electromagnets designed for changing the direction of the current. This is
effected by a contact piece used for closing the circuit and connected by a wire
with this third pair of electromagnets. The line wire is joined to the improved
apparatus by means of switches.
"
In the apparatus herein described the characters consists essentially of the
numerals 0 to 9. The sign "Office must moreover be provided if the apparatus
is used in large towns. If such an apparatus is to be employed for communicating
with other places another sign is added, which indicates the name of the place to
which the call station belongs. When communicating such a message it is
expedient to print first the number of the telephone station, then the sign "Office"
and the number of the latter, and finally the sign of the place.
Dated this 31st day of January 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Apparatus for Registering Telephone Calls.
I, LUDWIG KAHN, of 107 Grindelallée, Hamburg, in the Empire of Germany,
Manufacturer, do hereby declare the nature of this invention, and in what manner 4
the same is to bo performed, to be partionlarly described and ascertained in and
by the following statement :-
My invention relates to improvements in apparatus for registering telephone
calls, and especially to a transmitter for producing currents of alternating polarity
to operate a printing telegraph at a distant station from the call station designed to 50
register the place and number of the latter in the event of the call sigual not being
heard at the distant station.
In the boomine draszin

page_text: Figure 1 is a diagram of the principal menus and the wire connections for
carrying out the present invention;
Figure 2, is a diagram illustrating the wire connections of two distant call
station;
Figure 3, is an end view of the switch lever of the transmitter, the contact ring
being in section, and
Figure 4, is a section on the line X X of Figure 1.
As shown at I to the left of Figure 1, the conductor a of the looul battery bis
divided into two branches a' and a', the branch a' of which conducts the current
through the coils of the pair of electromagnets cc, while the branch a' conducts
current to the electromagnets d d. When the branch a' receives current in the
manner hereinafter explained the electromagnets c c attract the armature & attached
to a spring aud carrying at its free end two pawls gg. The pawls are arranged
to engage alternately with the teeth of no escape wheel after the manner of un
anchor escape movement and thus regulate the rotation of the shaft 2 of the said
wheel which rotation is caused by a cord i having attached thereto a weight k.
On the shaft of the escape wheel is provided a typo wheel in having the same
number of types m' as the escape whool possesses teeth, so that each time the
electromagnets co are energized the type wheel serving as an indicator is turned
through the space of one type.
When the type, designed for the printing and inked in any suitable manner, has
arrived opposite a pad n' secured to an armature n designed to be attracted by the
electromagnets dd which armature is attached to a spring o, it prints the characters
or signs upon a paper bands moved intermittently below the pad n¹. The movement
of the paper band wound from a roller and passing between the rollers t t¹ is
preferably effected by means of a weights' fixed to the paper band by automatic
olamping tongs, the forward movement being regulated by an escapement similar
to that of a clock or watch escapement, which consists of the two pawls p p
connected with the armaturen and an escape wheel 9 secured upon the axis of one
of the aforesaid guide rollers t t¹.
Whether the current of the local battery flows through the branch a' or the
second branch a², depends on which of the two magnets A' A' attached to the
eprings D' or D' is repelled by the corresponding pole of the electromagnets C¹ C³
placed opposite to the said magnets and actuated by means of the current in the
fine wire B.
When the current flows through one for the other of the said branches the
corresponding armature magnet is then forced against the contact pieces a³ aª
included in the conductor a of the local battery and designed to close the circuit.
The coils of these two electromagnets C C are so arranged that poles of
unlike name are presented to the magnets A' A' while the magnets themselves
present their poles of like name to the electromagnets. A change in the direction
of the current causes only that one of the magnets A' A' to be repelled opposite to
which is an electromagnet of the same name. This change in the direction of the
current is effected by means of the switch represented at 1I to the right of
Figure 1; Figures 3 and 4 show detail of this switch. The said switch cousists
essentially of the lovor F adapted to bo turned upon a journal E and two concentric
sliding rings G, H. One of these rings, in the example shown, the outer ring G is
permanently in electrical connection with the positive pole of one line battery J'
while the other ring H is connected in the same manner with the negative pole of
the second line battery J'.
The outer sliding ring G is provided at its upper surface with projections G¹,
Figures 1, 3 and 4, the number of which corresponds with that of the types m' on
the type wheel m. Below the switch lever a sliding spring is provided
which, on coming in contact with one of the projections G', causes the current of
the line battery J to flow through the line conductor B to the electromagnets C¹ C³
of the telephone station called and through a wire B' to the earth plate.
Such a closing of the circuit always causes the circuit a a¹ to be closed once, so

page_text: that after turning the switch lever Fround once, the type wheel m will also occupy
its initial position again. In order that this turning movement may always take
place in the same direction the sliding ring G designed for closing the circuit is
covered with a ring G³ made of non-conducting material and having its surface
formed after the manner of ratchet teeth; through this ring of non-conducting
material the projections G¹ pass into the upper face of the teeth and into roach of
the contact spring Fo of the lover F.
On the face of the ring G are provided the characters or signs corresponding.
with the types m² on the type wheel m, in auch a manner that the position of the
switch lover F indicates which of the types m' on the type wheel is opposite the
pad n' ready to print.
In order that this may take place the switch lover F has to be turned so far that
the sliding spring Fo is no longer in contact with the projection G' of the ring G,
which corresponds with the character to be printed and remains in the neighbouring
space between the teeth of the insulating ring G'. When a koob F¹ serving as a
handle on the switch lever is pressed against the tension of a spring K, Figure 4
towards the sliding ring H designed for closing the circuit so far that a piu F
provided in the said knob establishes, by means of a sleeve Fª surrounding it,
electrical connection between the ring H and the switch lever F and therefore of
the line battery J' with the electromagnets CC, the printing of the corresponding
type will take place as the armature n is attracted. At the moment when the
electrical connection discontinues owing to the knob being released, the papor
band is caused to move forward.
When this apparatus is not in use the switch must of course be so placed
that the current in the line coming from any telephone station can pass to the
electromagnets C¹C" designed for changing the direction of the current. This is
effected by a contact piece L used for closing the circuit and connected by a wire M
with these electromagnets.
Figure 2 shows how the line wire B is joined to the improved apparatus by
means of switches N.
In the apparatus shown the characters consist essentially of the numerals 0 to 9.
The sign "Office" must inoreover be provided if the apparatus is used in large
towns. In case such an apparatus is to be employed for communicating with other
places another sign is added, which indicates the name of the place to which the
call station belongs. When communicating such a message it is expedient to print
first the number of the telephone station, thon the sign "Office" and the number
of the latter and finally the sign of the place.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be porformed, I declare that what I
claim is :-
The combination, in an electrical circuit, of a transmitter for producing currents
of alternating polarity for operating a printing telegraph designed to register
telephone calls, a switch lever adapted 1 be set to the character or signs to be
transmitted, a type wheel designed to make impressions on a moving band,
electromagnets provided with a lover armature actuating the type wheel, and
similar electromagnets the lever armature of which causing the movement of the
printing strip or band beneath an ink pad, the said switch lever being electrically
connected on the one hand with the line wire and on the other hand through the
medium of a contact spring (F°) and ring (G, G¹) with one pole of a battery (J)
and through the medium of a contact ring (H) and a contact pin within tho
handle (F) of the switch lever with the opposite pole of a second battery (J').
Dated this 21st day of October 1902
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.