2 140,488

and when the revolution of h‘ is stopped by de-
pressing a key, the letter of the type-wheels
corresponding to that on the depressed key
is in position for printing. At the receiving
instrument the block ¢ is turned to take, and
the circuit-closer is no longer included in the
circuit, but the pulsations go direct through
the magnet @' to set the type-wheel, the route
being by binder 7, wire 37, binder 36, wire 38,
spring-arms 22 and 23, wire 39, binder 33, wire
32, magnet d', wire 31, and binder 8 to line or
earth connection. While the type-wheel lever
dis vibrating the spring d@ thereon does not
remain in contact long enough with the anvil
d@ to energize the printing-magneté; but so
soon as the pulsation in the type-wheel mag-
net ceases the circuit is closed through @ and
@, the current passing by binder 10, wire 40,
magnet’, wire 49, anvil d', spring a’, lever ¢!,
frame and bed a, and binder 11 back to bat-
tery g’, and the printing effected. The ful-
crum of the printing-lever ¢! is to be loose in
its bearings, so that the momentum may carry
the lever and its pad up to the type and produce
the impression, and then fall away to prevent
Dlurring the letter when the type-wheelis again
revolved. Thebrass screwse* passing through
the armature of the lever e!, coming into con-
tact with the cores of ¢, prevent adhesion be-
tween the surfaces and adjust the blow of the
impression-pad. A ratchet-wheel, m, upon
the governor-shaft g is provided, and a spring-
pusher, m®, is used to start the governor and
motor in the right direction when the machine
is putinto motion. The contact-points 20 and
spring contact-points 35 are in pairs, as seen
in the detached view, Fig. 4, and two of the
points touch before the other two, the object
being to lessen the risk of false or defective
pulsations, because the intensity of the spark
between the contact-points produces oxidation
that sometimes prevents the transmission of
thepulsation. This spark is between the points
that first come into contact; but if the spark
fails between these it passes between the sec-

ond -pair of contact-points, and. because this
second pair is so seldom exposed to the action
of the spark, their surfaces remain free from
oxidation a very long time.

Stop-pawls have been used to prevent the
type-wheel turning back, but they have been
employed. in connection with spring-pawls or
on a separate ratchet-wheel. I employ the
pawl’ and spring ¢ in connection with the
wedge-acting pallets shown, and such pawl is
so constructed that it prevents the type-wheel
being turned the wrong way by holding the
type-wheel in place when the pawls are not in
contact with the ratchet-wheel, but are moving
from one side to the other.

I claim as my invention—

1. The circuit-breaking wheel o actuated by
the wheel 4, in combination with the pawl 15,
ratchet-wheel k, arms m, and range of finger-
key bars ’, substantially as and for the pur-
poses set forth. *

2, The switch-block ¢, circuit-springs 22 23
24 25 and their connections, substantially as
set forth, in combination with the cireuit-closer
0, line-connections and type-wheel magnets 4’,
substantially as set forth.

3. Thestarting mechanism, consisting of the
pawl m® and ratchet-wheel m*, in combination
with the governor and maguetic motor, sub-
stantially as set forth.

4, The screws ¢ applied to the armature of
the printing-magnet, for the purposes set forth.

5, The stop-pawl ¢’, in combination with the
type-wheel, wedge-acting pallets, and ratchet-
wheel, for the purposes set forth.

6. The double pairs of spring circuit-closing
points 20 and 35, one pair set to come into con-
fact before the other pair, for the purposes set
forth.

Signed by me this 23d day of April, A. D.
1873,

THOS. A. EDISON.
Witnesses:
Cuas. H. Somrn,
Guo, T. PINCKNEY.



UNITED STATES

PATENT OFFICE,

THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR 'TO THE GOLD
AND STOCK TELEGRAPH COMPANY, OF NEW YORK, N. Y.

IMPROVEMENT IN PRINTING-TELEGRAPHS,

Specification forming part of Letters Patent No. 140,488, dated July 1, 1873 ;

application filed

May 16, 1873,

To all whom it may concern:

Be it known that I, Tomas A, Enison, of
Newark, in the county of Essex and State of
New Jersey, have invented an Improvement
in Printing-Telegraphs, of which the following
is a specification:

In this machine there is a circuit-breaker
driven by an electric engine, and this pulsator
makes and breaks the circuit of the main line
and causes all the type-wheels in the circuit
to revolve in unison through the agency of an
electro-magnet and step-by-step mechanism.
When a key at the trans tting-station is de-
pressed it stops the circuit-breaker and arrests
the movement of the type-wheels. At each
station is a local battery that is brought into
action by the cessation in the movement of
the type-wheel lever closing the circuit and
throwing the current into the printing-mag-
net,

In the drawing, Figure J is an inverted plan,
representing the principal portionsof the mech.
anism, Fig. 2 is a vertical section, showing
the operative portions of the machine; and
Fig.3 is a general plan view ona smaller scale,
representing the conuections.

The bed a of the machine is of suitable size
and shape, and around on one side is a range
of finger-keys, b, occupying one-third of the
circle, and these are connected with the bars
u, beneath the bed a, that stand radially
around the wheel hk! that is in the middle of
the bed, and is hereafter referred to. The
type-wheel ¢’ is revolyed by a step-by-step
movement from the lever d, electro-magnet a,
and spring 3. The unison mechanism ¢ and,
the printing-lever ¢! and magnet ¢ are similar
to those in my patent No, 126,532. The feed-
ing mechanism for the paper is similar to that
in my patent No. 126,532, and there is a pawl
and retaining-clamp, 4, to prevent the paper
drawing back, asinsaidpatent. Themotor con-
sists of the electro-magnets f f ‘, Vertical shaft
g, and governor-balls g', and the speed is reg-
ulated by short-cireuiting the battery-connec-
tion by the collar 5 and finger 6, asin my pat-
ent No. 131,343, The connections are made
as shown in Fig. 3; the binding-screws 7 and
8 are the line-connections, or line and earth,
The connection 9 is to the engine, and 10 to

the printing-magnet, aud 11 is the return-con

nection to the local battery g. The motor
drives the wheel 4 by the pinion 13, and this
communicates motion to the pinion 14 and a
wheel, h!, to which is attached a ratchet-wheel,
k. The wheel it is loose upon the same shaft
as the wheels i! and &, and it is rotated by a
pawl, 15, that is upon the wheel Tt, and takes
the teeth of the ratchet-wheel i, The arms
m, three in number, project from a hub around
the shaft 4%. One of them is contiguous to a
knuckle on the pawl 15, so that when one of
the finger-keys D is depressed, and one of the
arms m comes into contact with the bar d! of
the depressed key, then the arms m are arrest-
ed, and the wheel i, moving slightly by the
pawl, brings the knuckle of the pawl into con-
tact with said arm m, and. throws the pawl
out from the ratchet-wheel k, thereby allowing
the ratchet-wheel & and wheel ht to continue
to revolve, but stopping the wheel i‘ and the
parts deriving motion from it, In this man-
ner the circuit-closing wheel o is stopped, said
wheel receiving motion from the pinion o”, and.
as soon as the finger-key is raised the spring
0° throws the pawl 15 back into contact with
the ratchet-wheel k, and the motion of the cir-
cuit-closing wheel is renewed. ‘The lever s is
operated by cam-projections on the wheel 0,
and, by the contact-points 20 and 35, and
springs 21, the cireuit next described is opened
and closed. There is an insulated block, t,
upon which the springs 22, 23, 24, and 25 rest,
and in itare conducting-blocks. When almnob
above the bed of the machine is turned to the
word “ take,” the circuit is closed through the
springs 22 and 23, When it is turned to the
word “ send,” the circuit is closed through 2£
and 25, The parts are so timed that the num-
ber of times the circuit is opened and closed
during each revolution of the wheel Aé equals
three times the number of the keys b, and
hence that the pulsations acting in the line
make three revolutions of the type-wheel, the
pulsations passing by the binder 7, wire 387,
screw 36, metallic frame and lever 8, contact:
points 20 35, springs 21, and connection to the
binder 33, wire 32, magnet di, wire 31, and
binder 8, and thence along the line to the dis-
tantinstruments, and setting their type-wheels,



3 Sheets--Sheet 1.
T. A. EDISON, :

Printing Telegraphs.
No. 140,488, Patented July 1, 1873.

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3 Sheets--Sheet 2.
T. A. EDISON.

Printing Telegraphs.
No. 140,488, Patented July 1, 1873,

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3 Sheets--Sheet 3.
T. A. EDISON.

Printing Telegraphs.
No. 140,488. Patented July 1, 1873,

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