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Патент USA US2120850

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June 14, W38.
M. AMANN ET AL
25,120,350
PRINTING TELEGRAPH RECEIVER
Filed Feb. 29, 1956
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June 14, 1938.
M. AMANN ET Al.‘
2,120,850
PRINTING TELEGRAPH RECEIVER
Filed Feb. 29} 1956
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June 14, 1938.,
M. AMANN ET AL
2,120,85Q
‘PRINTING TELEGRAPH RECEIVER
Filed Feb. 29, 1936
6 Sheets-Sheet 3
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MAX AMA/VA!
June '14, 1938»
M. AMANN ET AL
2,120,850 '
PRINTING TELEGRAPH RECEIVER
Filed Feb. 29, 1936
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June 14, 1938.
M. AMANN ET AL'
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PRINTING TELEGRAPH RECEIVER
Filed Feb. 29, 1936
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June 14, 1938.
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Attorneys.
2,120,850
Patented June 14, 1938
UNITED STATES PATENT OFFICE
2,120,850
PRINTING TELEGRAPH RECEIVER
Max Amann, Alfred Lahl, and Hans Hatzinger,
Frankfort-on-the-Main, Germany
Application February 29, 1936, Serial No. 66,426
in Germany March 2, 1935
17 Claims.
This invention relates to printing telegraph re
ceivers having a type wheel and a selecting mech
anism which comprises a set of rotary permuta
tion or code discs and a set of testing members
5 adapted to cooperate with the discs and which
can be set into different positions by means of
a single magnet. In this type of receiver, the
various testing members are successively set by
the magnet under the in?uence of the successive
10 current impulses of a received telegraph signal
through the agency of a rotating device. The
whole set of testing members is then moved
towards the rotating discs which have grooves
in their peripheries arranged so that the testing
members can only engage in them and thus lock
the discs in one particular angular position of
the discs for any one setting of the testing mem
bers. The type wheel is connected to the code
discs and rotates with them. When the discs are
20 at rest, a particular type lies in front of a print~
ing hammer by means of which this type can be
printed.
213
The object of the invention is to reduce as far
as possible the load borne by the above-mentioned
magnet when setting the testing members and
to transmit the force to be used for setting these
testing members through an auxiliary device so
that the sensitivity of the magnet can be increased
and the magnet can be made to respond to weak
current impulses. In accordance with the inven
tion the setting of the testing members is effected
as a consequence of the position taken up by a
rotary device controlled by the magnet and as a
result of the force maintaining this device in ro
tation. The rotary device is positively set dur
ing the rotation so as to determine a particular
setting of the testing members and is held in the
set position merely by bringing the armature
of the magnet into one of its two extreme posi
40 tions at particular intervals of time. The test
ing members are thus set only indirectly in de
pendence upon the position of the armature. The
magnet itself thus does not exert the force for
setting the rotary device and for setting the
testing members. The position of the magnet
armature is moreover positively determined by the
rotary device and the setting of the testing mem
bers is effected positively according to the posi
tion assumed by the rotary device which is itself
dependent upon the position of the armature, by
the ‘force maintaining the device in rotation.
In order that the invention may be thoroughly
understood and be more readily carried into
effect, an example of construction in accordance
(Cl. 178-34)
therewith will now be described with reference to
the accompanying drawings, in which:—
Figure 1 is a plan view of a telegraph receiver in
accordance with the invention.
Figure 2 is a sectional elevation of the re- 5
ceiver.
Figure 3 is a cross-section taken on the line
III—III in Figure 1.
Figures 4-6 illustrate details of the mechanism
1O
shown in Figure 3.
Figure 7 is a cross-section taken on the line
VII—VII in Figure 1.
Figure 8 is a diagrammatic representation of
the selecting mechanism.
Figures 9 and 10 show the selecting mechanism 15
in two testing positions.
Figure 11 is a perspective View of the testing
levers of the selecting mechanism.
Figure 12 shows diagrammatically the positions
taken up by various parts of the selecting mech
20
anism on selection of the letter A.
Figure 13 is a cross-section taken on the line
XIII-~XIII in Figure 1.
Figure 14 is a sectional plan View of part of
25
the arrangement shown in Figure 2.
Figures 15 and 1'7 are plan views showing in two
different working positions the devce provided
for bringing the printing mechanism into opera
tion.
Figures 16 and 18 are respectively a side eleva 30
tion and a front elevation of part of the device
shown in Figures 15 and 17, and
Figure 19 is a sectional elevation to a larger
scale of a detail illustrated in Figures 15 and 17.
The illustrated receiver has a single receiving 35
magnet and the whole of the members which
are necessary for printing a type are mechanically
controlled during and after reception of the ap
propriate code signal.
The type is carried by a type Wheel and the 40
printing takes place on a paper strip when the
type wheel is at rest. The type wheel can assume
64 different positions and one of 32 different po
sitions can be selected on reception of a 5-unit
code signal. Shift signals cause the type wheel 45
to be stepped backwards or forwards through
l/64th part of a revolution. In this way, ?gures
and signs can be printed in addition to letters
of the alphabet. In some positions, correspond
ing to switching steps and the like, printing is 50
prevented.
The setting of the type wheel is controlled by
'means of a selecting mechanism comprising two
sets A and B each of 5 testing levers each of which
cooperates with a pair of code discs. The testing 55
2
2,120,850
levers can be displaced individually relatively to
normal position illustrated in Fig. 2 by the pawl
the pair of code discs associated with them. This
displacement is effected by means of a distributor
which is rotated as synchronously as pos
sible with the transmitting distributor or the re
ceived signals. The various testing levers are
displaced successively and the displacement is
I33, seen in Figs. 3 and 4.
The sleeve I28 has oblique grooves I34 (Fig.
14) cut in it at one of its ends in which engage
dogs or lugs I35 projecting radially inwards from
a ring I39, ?xed to a sleeve I31. This sleeve I31
is capable of axial displacement and is guided
controlled indirectly by the receiving magnet in
during such displacement by guide slots I38 in
accordance‘with the received code signal.
When
the sleeve H29.
A drum I53 to whichv is ?xed
the testing levers have been set in their displaced
the distributor arm I52 is mounted on the sleeve 10
positions, they are brought, as a set, into contact
with the pair of code discs associated with them,
I29. This drum can be reciprocated easily along
the sleeve I29 without angular displacements and,
for this purpose is provided with pins I54 (Fig.
so that they can engage, as a set, in the grooves
formed in these discs when the latter are subse
15 quently rotated.
This engagement of the testing
levers in the grooves in the code discs is only
possible in one of 32 positions of the code discs,
this position being determined by the setting of
the testing levers. The type wheel rotates with
20 the code discs and thus takes up the position de—
2) ending in rollers which lie in the grooves I33
formed in the sleeve I29.
15
The sleeve I29 terminates at its forward end in
a ?ange I59 to which are ?xed a cam disc I68 and
a wheel I32.
Rotation of the sleeves I28 and I29 with the
stopped by the testing levers when thelatter
shaft II8 which always takes place to the extent 20
of half a revolution is effected by the pawl’ I 33,
(Figs. 3 and 4).
The pawl I33 is pivotally mounted at I13 and
come into the grooves in the code discs.
its curved end normally projects into one of two
termined by the selecting mechanism and in
which the code discs and the type wheel are
The
printing or other operation then takes place with
the type wheel at rest. The selection of the
position of the type wheel corresponding to the
setting of one set of testing levers can take place
While the other set of testing levers is being set
by a subsequent signal.
The printing of the selected type (or the shift
or other step) is effected directly by the print
ing mechanism after the code discs and the type
wheel have been brought to rest. These steps are
effected by a motor.
The receiver (Figure 1) is driven by a. motor
I32 through a worm and a worm wheel I84, I85.
This single motor is also used to drive and con
trol the distributor arm I52 (and the parts con
nected therewith), to rotate the code discs I93—
I98 and the hub I25 which carries the type wheel
I25 and to control the parts connected with the
printing or with the prevention of printing.
The worm N14 is connected to the shaft I81 of
the receiver through a flexible coupling I68. The
shaft I81 carries two toothed wheels H2, H3.
The wheel II2 meshes with a wheel II4 of twice
its own diameter and forming part of the start
stop mechanism. The wheel II3 meshes with a
smaller wheel H5 which drives the selecting
mechanism. The wheel H4 is ?xed to the shaft,
! i8 of the receiver by means of a hub I I6 forming
one part of a dog clutch (Fig. 2) and a grub
screw H1.
The wheel H3 (Fig. 2) is mounted to rotate
on the type wheel shaft I22 which is coaxial with
the shaft H8. The type wheel I25 and the cam
discs I21 associated with it are mounted on. the
carrier member I26 keyed to the front end of the
shaft I22.
At its front end, the shaft I81 has ?xed to it
one part 262 of a dog clutch (Figures 15 and 17)
by means of which the parts which come into
play for eifecting printing are coupled.
, Two sleeves E28 and I29 (Figs. 2 and 14) are
freely mounted on the continuously rotating
shaft H8 of‘ the receiver. The sleeve I28 has
forked lugs 592 (Fig. 2) projecting from it in
which engage dogs I9I on the part I38 of the
710 clutch i363, H6, which part is free to slide on the
sleeve I28. A helical spring E32 abuts against
the lugs I92 and the part I38 and is housed with
in a drum I3I rigidly ?xed to the part I38. This
spring I32 tends to cause the clutch I38, II6 to
engage but is prevented from so doing in the
diametrically opposite openings I'II in the drum 25
i3I and holds the drum in the stop position. In
this position, an oblique surface I 88 bounding the
opening I‘II bears against an oblique surface at
the upper left hand end of the pawl I33 so that
the clutch I18, I38 (Fig. 2) is held disengaged. 30
The drum I3I is prevented from rotating back
wards by the check pawl I11 (Figs. 3 and 5) piv
otecl at H8 and which normally abuts against the
upper edge of the opening I1I opposite to that in
which the pawl I33 is engaged.
35
A spring I13 urges the pawl I11 into engage
ment and tends to hold the pawl I33 out of en
gagement with the openings I'II in the drum I3I.
In the normal position, the spring I16 is pre
vented from swinging the pawl I33 clockwise 40
because the lower end of the arm I15 attached to
the pawl abuts against the cranked end of a bar
I85 forming part of a pivotable member I83,
(Fig. 6).
A third arm !14 (Fig. 3) moving with the pawl 45
I33 is disposed in the plane of two diametrically
opposite abutments I19 formed on the edge of
the drum I3I.
The arm I14 can only come into
contact with the abutments I19 when the pawl
I33 is pivoted out of the normal position. This 50
only happens shortly before the completion of
the half revolution of the drum I3I. The bar
I85 can be pivoted about the pivot I831» against
the action of a weak spring I84. The arm I82
of the pivoted lever I83 lies opposite the end 55
I3! of the armature I48 of the magnet I58 (Figs.
3, 6 and 7) .
When the armature I48 drops, its end I8I abuts
against the arm I82, pivots the lever I33 against
the action of a spring I84 and releases the arm 60
I15. The pawl I33 is now effectively acted on
by the strong spring I16 and, as a result, the arm
I15 rides over the sloping face. I86 (Fig. 6) of
the cranked part of the bar I 85. The force thus
exerted on the arm I85 assists in the pivoting of 65
the lever I83 and the pawl I33 is thus elfectively
un-latched by a small movement of the armature
I48.
In the normal position, the magnet coils are
supplied with current and hold the armature I48 70
in the position illustrated in Fig. 7 against the
action of the spring I81.
The disengagement of the pawl I 33 from the
opening I1I in the drum I 3| when the arma
ture I48 drops allows the compression spring 75
33
2,120,850
I 32, (Fig. 2) to bring the teeth on the clutch mem
ber I39 into engagement with the teeth on the
rotating clutch member IIB. From this instant
onwards, the shaft I I8 is coupled by the dogs I9I
to the sleeves I28 and I29 and the whole of the
parts guided by the sleeves, including the dis
tributor arm I52, are rotated together.
Shortly before the drum I3I has completed
half a revolution, one of the abutments I'I'9 (Fig.
10 3) abuts against the. arm I'M and turns the pawl
I33 against the action of the spring I75. At this
instant, the opening III in which the pawl Ill
was previously engaged is opposite the pawl I33.
The sloping surface I88 bounding this opening
15 now abuts against the head of the pawl I33 and
the drum I3I is moved in the direction of the
ing mechanism.
The levers I5'I (Fig. 13) by means of which the
testing levers I58 are displaced are pivotally
mounted in bearings 235 on the rear side of the
frame I2I. The levers I51 are curved at their
free ends and end in lugs 23? disposed in a circu
lar path wiped over by the lug I55 of the dis
tributor arm I52 (Figs. 1, 2 and 'l). The lugs 93‘? 10
have sloping surfaces and when the lug I55 passes
over them, the free ends of their levers I5‘? are
depressed.
arrow shown in Figure 4. This causes the clutch
The distributor arm I52 is fixed to the drum
I53 (Fig. 2) which is free to move axially rela 15
tively to the sleeve I29 but is constrained to re
tate with the latter by the pins I55. The arm
I39, IIB to be disengaged, the drum I3I to be
stopped and the arrangement to be brought to
rest after exactly half a revolution.
The selecting mechanism comprises two sets
sion spring I55 which abuts against the flange
I59 of the sleeve I29. The drum I53 in the right
hand position illustratedv in Figure. 2 reaches al
A and B of testing levers I58 and the code discs
I93-I.96.
25
of the two sets A and B have projections 259 and
298’ which control an escapement for the print~
(Figs. 8-12).
The testing levers I58
are not shown in Fig. 2.
Each testing lever I58 is mounted on a pin
or shaft I98 (Fig. 11). The latter are. mounted so
as to be movable axially in the brackets IZI and
the side plates 25L (Figs. 1 and 11). The side
plate 29I for each set of levers is held at the
correct distance from the bracket I2I by a dis
tance piece 292. The pins or shafts I98 and
therefore the testing levers on them, can be set
into a forward or a backward position by means
of control levers I51 (Figs. 1 and 13) which pro
ject through slots in the flat ends I99 of the
shafts I98. They are maintained in these posi
tions by springs 299 (Fig. 11).
The testing levers I58 can be displaced parallel
to the axis of the code discs, the levers I58I--V
40 of the set A relatively to the code discs I93, I94
and the levers I53I'—-V' of the set B relatively to
the discs I95, I95 This is diagrammatically il
lustrated in Figure 8. The distance apart of the
code discs in a pair is less than the sum of the
thicknesses of two testing levers I58, (Fig. 11).
The tails 295 of the. testing levers of each set abut
against each other and are connected together
by a spring 297 or 291’. The displacement of the
testing levers parallel to the axis of‘ the code discs
does not bring their tails 294 out of contact with
each other. This is clear from Figure 11, where
the testing lever I58III is shown in the extreme
right hand position and the testing lever I58IV
in the extreme left hand position.
This mutual support of the testing‘ levers I58
prevents independent movement of the levers
about their shafts I93.
The topmost lever of the set B and the lower
most testing lever of the set A each has a rear—
ward extension 295 and the topmost lever of the
set A and the lowermost lever of the set B a simi
lar extension 295' (Figs. 9 and 10). A spring 206
is anchored at one end to the projection 395 of
the lever I58V and at the other to a control lever
I61; a spring 255’ is similarly connected to the
lever I53V’ and the control lever I58. The ends
405 and 405’ of the control levers I67 and I-58
abut against the projections 295' so that when
one of these levers is swung about its pivot IE?’ or
IE8’, the set of testing levers I59 associated with
it is swung as a whole about their pivotal axes
into or out of engagement as the case may be
with the pair of code discs associated with that
set.
‘
The lowermost testing levers I59V and I581’
I53 and the drum I53 are acted on by a compresm
most to the base of the drum MI.
The drum I4! is ?xed on the supporting frame
I45. 10 slowly rising and suddenly falling cams
I49 (Fig. '7) are distributed over its circumfer
ence. During half a revolution of the sleeve I29,
these cams, by coming into contact with the two
rearwardly projecting lugs I5! (Fig. 2) on the
distributor arm I52 determine ?ve forward and
backward movements of the latter. The two
lug‘s I5I ride at the same time, over oppositely
disposed cams I49, the latter being arranged
symmetrically on the drum MI.
The cranked end I41 of the armature MS of the
magnet I50 projects through an opening M5 .35
formed'in the lower part of the drum I/II (Figs. 2
and 7). It prevents the drum I53 from being
moved by the spring I55, as, while the lugs I5I
are sliding over the cams I49, it slips between the
edge of the drum I53 and the base of the drum 40
I4! and remains here when the lugs I5I have
passed ‘clear of the cams I49.
The lever I4‘! is yieldingly connected to the
armature I48 by means of a spring I99 (Fig. 7).
This armature is periodically brought up to the
pole I65 by the action of the cam disc I59 on
the member I 54 ?xed to the armature. The mag
net I59 therefore only has to exert a magnetic
force to hold the armature I43 attracted to the
pole when the part IE4 is free of the cams I53.
This release of the part I54 by the cam I53 always
takes place at about the middle third of each
signal impulse, at which instant, the signal cur
rent has reached its peak value. If this release
takes place when no current is flowing, the arma
ture I48 is turned anticlockwise by the spring
I81 and the lever I41 comes out of contact with
the drum I53.
The cam disc I69 is ?xed to the sleeve I39
which also moves with the distributor arm I52 60
and the drum I53. The arrangement is so de
vised that the distributor arm I52 and the drum
I53 are engaged by a cam I48 before the part
I64 is engaged by a cam I53 and are released
by the cam I49 at the earliest, at the same in~
stant as the armature projection I54 is released
by the cam I63. In this way, the engagement
of the armature lever I47 between the drum I53
and the stationary drum MI is ensured. In order
to synchronize the signal impulses and the rota
tion of the cam disc I50, the ?ve successive cams
I63 are advantageously made of increasing
length.
The distributor arm I52 and the drum I53 can
only be moved axially by the spring I55 when 75
2,120,850
the lugs I5I lie between two of the cams I49 on
the drum .I4I. When the magnet I50'is ener
gized, such axial movement is prevented by the
lever I41 of the armature I40. The lugs 231 on
the levers I51 are also disposed in the intervals
in each set has a corresponding value. The ends
203 of all'thetesting levers of both sets are exactly
the same;
The ?ange 209 can, if desired, be provided with
between the cams I49.
preventing recoil of the code discs when they
are stopped by the testing levers. Such a pawl
'
If, then, the drum I53 is prevented from mov
ing by the armature lever I41, the lug I56 on
the arm I752 abuts against the lug 231 formed
10 on a lever““l51 so that the associated testing lever
I58 is transferred into its other extreme position.
On the other hand, when the lug I5I of the arm
I52 is allowed by the armature lever I41 to engage
in the space between two of the cams I49, the lug
could be brought into action by the movement
of the control levers I61 and I68.
The toothed wheel II5 (Figs. 1 and 2) is freely 10
mounted on the shaft I22. It is frictionally
connected to it both through the clutch plate
2I0 (Figure 2) and through the outermost code
control levers I51. The latter therefore remain
in the extreme forward position.
The extreme forward position of the levers I51
and the testing levers I58 is determined by a
disc I96. The pressure exerted on the clutch
plate 2I0 can be varied by displacement of a
ring 2I2 and a resilient, split, dished disc 2H.
The position of the ring 212 can be adjusted by
means of a nut 2I3 and any setting can be main
tained by means of a lock-nut 2I4.
cam 238 (Figs. 1 and 13) before these levers are
set by the lug I56 of .the arm I52. This cam
238 is arranged on the disc I62 at a given angle
As already stated, the drum I26 carrying the 120
type wheel I25 is ?xed to the type Wheel shaft
I22 by means of a key 220. The type wheel
a (Fig. 13) in advance of the lug I56 on the arm
carries groups of cam discs I21 or a grooved
I56 is out of the plane of the lugs 231 on the
I 52. In this way, shortly before the lug I56 wipes
N) MI over the lugs 231, the testing levers I58 are
brought successively into the forward position by
engagement of the cam 238 with the rear side
of the lugs 231, in which position they can be
acted upon by the following lug I 56.
30
The levers I61 and I68 (Figs. 9 and 10) which
rest on the uppermost testing levers I581 and
I581’ are controlled by a cam groove I6I in the
wheel I62 and a follower pin I66 (Fig. 9).
They
are pivoted simultaneously, one inwards the other
ca in outwards during the last 7th part of each half
revolution of the wheel I62.
When, at the end of the half revolution, the
lever I61 (Fig. 9) has been brought into action
the member 405 abuts against the free end 205
of the uppermost testing lever I58I of the set A.
The blow is transmitted through the tails 204 to
the lever I58V so that all the levers of the set
A are swung clockwise about their bearing pins
I98. Their ends 203 are thus removed from the
grooves in the code discs I93, I94. At the same
time, the lever I68 is swung so that its member
405' is removed away from the projection 205'
of the lowermost lever I581’ of the set B. The
spring 206' pulls on the lever I58V' and all
the levers of the set B are swung counterclock
wise. The ends 203 of these testing leversnow
lie on a pair of code discs I95, I96 but do not
immediately engage in the grooves therein. (It
cannot be assumed that out of the many cases
that can occur, that case will be present in which
the whole of the ?ve testing levers will be oppo
W
a tooth in which can engage a check pawl for
site corresponding grooves in the discs and, there
fore, be able to engage immediately therein.)
Moreover, the testing levers of the set B remain
under the in?uence of the spring 206’ until all
the testing levers can engage simultaneously and
stop the code discs.
The code discs I93-—-I96 are rigidly connected
to the ?ange 209 (Fig. 2) on the shaft I22. The
drum for controlling auxiliary devices.
The selecting mechanism operates as follows:— >
The code signal received in connection with the
letter A consists ?rstly of a no current impulse
(start element), then two current impulses, then
three no current impulses and ?nally a 7th cur
rent impulse (stop element).
On reception of the start impulse, the sleeve
I29 is coupled to the shaft II8 for half a revo
lution. During this rotation the distributor arm
I52 is displaced axially ?ve times against the
action of the spring I55 by means of the lugs I5I
which slide over the cams I49, once‘ at the begin
ning of each of the ?ve received current impulses.
At the same time, a cam I63 on the disc I69 acts
on the part I64 of the armature and brings the
armature I48 up to the pole I65. At about the 40
?rst third of each current impulse, (with disc
I60 also of the stop impulse) the lugs I5I and
IE4 reach the highest point of the cams.
The arm I52 is pressed back together with the
drum I53 by the spring I55 as soon as the end of , ,
a cam I49 is reached. If the cranked end of the
lever I41 is at this instant lifted and the arma
ture attracted, the drum I53 cannot move back
wards and the arm I52 remains in the displaced
position in which its lug I56 acts on the lug 231
of the appropriate testing lever.
In the case under consideration, after the start
impulse, the armature which has been brought
near the pole remains attracted for two current
impulses and thus prevents the return move
ment of the arm I52. The lug I56 on the dis
tributor arm thus acts on the lugs 231 of the
control levers I51I and I51II (Fig. 13), and thus
displaces the testing levers I581 and II. The
following three no-current impulses allow the 60
armature which, on further movement towards
the pole by means of the cam I63, meets no mag
The smallest cam in the code discs extends
net holding force, to release and, as the lever I41
is also released, the arm I 52 and the drum I 53
to assume the right hand position illustrated in 65
Figure 2. The three levers I51III, IV and V are
thus not effected by the lug I56 and with the test
ing levers I58III, IV and V, remain unset.
The resetting cam 238 is in advance of the lug
I56 of the distributor arm I52 and brings into
the forward position the control lever I51 of the
set A which is to be acted upon.
After reception of the signal, the testing levers
over all; part of its circumference. The distance
37:5 between the ends 203 of the testing levers I58
I58I—V of the set A are displaced as is shown
in Figure 8 for the set B.
75
> pair of code discs I93, I94 belonging to the set
A is identical with the pair of
belonging to the set B, but the
displaced through 180° relatively
The discs in each pair are also
discs I95, I96
two pairs are
to each other.
similar except
7-0 that one is provided withcams in the form of
humps and the other with cams in the form of
grooves.v
'
‘
5
2,120,850
However, during the reception of the stop cur
rent impulse, the displaced levers of the set A
are released by the lever I61 through the agency
of the cam track I 6| in the wheel I62. The test“
ing levers are thus pivoted by the spring 2% act
ing on the end 205 of the lever I58V so thatthe
ends 203 of these levers lie on the code discs I93
and I94 of the set A. The testing levers of the
set E which up to now have been in engagement
with their code discs are swung out of engage
ment as a set by the lever I68 which is caused
to strike the tail 225’ of the lever I531’ (Fig. 10).
The levers I58I’—V’, however, are still not re—
turned into the forward normal position.
In the meantime, on reception of the stop
15
impulse the maintenance of the sleeve I29 is pre
pared by the arm I52 and can be effected without
in?uencing the succeeding steps.
As soon as the ends 203 of the testing levers
20 in set B are removed from their operative posi
tion in the grooves of the discs I95 and IE6, all
restraint is removed from the code discs and these
are driven by the wheel H5 through the clutch
2M, H5. The 'shaft I22 and all the code discs
25 and all the other parts rotate together at a rela
tively high speed.
The time required for a complete revolution of
the shaft I22 corresponds approximately to the
duration of ?ve signal impulses on the assump
30 tion that two sets of testing levers are used.
During the rotation, all the ends 203 of the
engaged set A of testing levers will slide on the
code discs I93 and I94. These testing levers can
engage in the grooves in these discs when, as il
lustrated in Figure 12 for the set B, the one ap
propriate position out of the 32 possible engaging
positions is reached. In any other position, there
may be from one to four of the levers I58 above
corresponding grooves, but no engagement there—
40 in is possible because the abutment of the testingv
levers one on another only allows the levers to
move all together, that is to say, as a set.
The engagement of the levers of the set A is
accelerated by the- action of the spring 286.
When the selecting position is reached, the shaft
is suddenly stopped by the ends 203 of the
testing levers I58I—V. The impact caused on
stoppage of the type wheel shaft I22 is received
directly by the bearing pins‘ I88 of the testing
50 levers.
The relative positions assumed by the code
discs and testing levers for the selection of the
letter A (the case under consideration) is illus
trated in Figure 12. Here, however, the selec“
tion was effected by the lever of the set 13 and
the discs I95 and I96 of the set B which are dis
placed by 180° relatively to the code discs of the
set A. The letter A on the type wheel I 25 is then
in the printing position. The two sets A and B
60 are used alternately for successive incoming
signals. During one half revolution of the dis
tributor arm I52, the testing levers of the set A
are set and are released for cooperation with the
discs I955, I92 and during the next half revolu
'-> tion, the levers of the set B are set and released
for cooperation with the discs I95, I96.
The impulses transmitted to the magnet I59
regards the impulses of any one signal) the re
ceiver has to be provided with a device for regu
lating the phase position of the selecting mecha
nism relatively to the start-stop mechanism.
At the ?rst release of the armature M8 after
the start impulse, the start-stop mechanism cou~
ples the shaft M8 to the sleeve I28 through the
clutch wheels H5 and I32 for half a revolution.
This sleeve I28 (Fig. 14) is coupled to the sleeve
I29 of the selector gear by the dogs I35 on the
flange I 36 which engage in the oblique grooves
I34 at the forward end of the sleeve I28. The
flange I36 is ?xed to the sliding sleeve IZi'I which
is guided
the longitudinal slot I33 in the sleeve
I29. The sliding sleeve I3‘! is formed with a 15
circumferential groove in which half rings 29]
are housed. The ring 391’ is held by means of the
nut I29 on the tubular screw threaded extension
I40 of the ?xed drum MI. ‘The nut I39 has a
milled head I42 with which engages resiliently
a blade M3 mounted on the frame Ill-5 (Fig. 2).
The ring I35 is displaced by rotation of the
nut I39 which can be effected when the blade
M3 is lifted. This rotation brings the dogs I35
against the walls of the oblique slot I34 which
have a de?nite position in the normal position
of the start-stop mechanism and the grooves I38
in the sleeve I 29 are caused to take up a new
position relatively to the start-stop mechanism.
The distributor arm I52 and the cam disc I68 30
are thus rotated relatively to the sleeve I28 of the
start-stop mechanism.
The setting nut I35 can be provided with mark
ings to determine the phase position of the se
lecting mechanism relative to the start-stop 35
mechanism.
The arm I52 and its lugs I5! and E55 slide
over the rising parts of the cams I49 on the
?xed drum Ill! and come up against the lugs 23‘!
of the levers I5‘! controlling the testing levers 40
I58 at particular instants of time during the re
ceived signal impulses, according to the relative
phase positions assumed by the selecting mecha
nism and the start-stop mechanism.
Also, by
means of the cams I63 on the disc I62 (Fig. '7) the 45
armature its is pressed towards the pole I25 at
the appropriate most favourable instant of time.
In this way, the armature, the position of which‘
determines the position of the drum I53 and the
arm I52, is controlled with certainty by the mag 50
net even with strongly distorted impulses. The
most favourable phase position, which may vary
quickly particularly with open line telegraph op
eration can be set and corrected during opera
tion.
55
A printing device translates the position given
to the type wheel shaft I22 by the selecting mech
anism. If the shaft is in a position associated
with letters or signals, printing will be effected;
if in a position associated with switching steps,
printing will be prevented.
This printing mechanism is controlled by the
cam discs II--V on the carrier 2% (Fig. 15) which
is mounted on the shaft IEB'I. The lever devices
cooperating with these cams control further le 65
vers (not illustrated) some of which cooperate
with the cam discs I2'l on the type drum IZE and
others of which effect the release and return of
the printing hammer 221.
The sleeve 2M by means of which the part 2262, 70
(Figs.
15 and 16) of the clutch 255, 262 is ?xed
selecting mechanism, to use only those parts of '
the various impulses of the signal in which the on the shaft IIl'I carries the sliding half 269 of
the clutch. The part 260 is pressed towards the
most favourable current values occur. As the
point at which the most favourable operating part 262 by a helical spring 255 which abuts 75
against the carrer 264. The carrer 264 is freely
conditions occur varies, (although constant as
from the transmitter are more or less distorted
according to the conditions in the line.
It is usual, for the purpose of controlling the
6
2,120,850
mounted on the end of the shaft I01 and rotates
with the part 269.
tributed over their circumference.
The cam discs II—V can be carried round
through one-third of a revolution of the shaft
191 by means of the clutch 269, 262.
The clutch 269, 262 is controlled by a pawl 2M
pivoted at 255. This pawl has two claws 25'! and
258 (Fig. 16) which cooperate with the diamond
shaped projections 259 on the part 260 of the
10 clutch.
have threecorresponding humps'uniformly dis~
A spring 242, (Fig. 18) tends to keep
the pawl 241 out of engagement with the pro
jections 259.
The pawl MI is pivoted by a rod 249 hinged to
it and pressed by the spring 242 against the front
15 of two arms 249 and 250 pivotally mounted on a
common pin 248 which is arranged in line with
the rod' 240.
The arms 249 and 259 are pressed together by
a spring 25I and can be swung about their hinge
20' 248 by means of .a pin 252 on a T-shaped member
254 also pivotally mounted on the pin 248. The
branches of the T-shaped member are engaged
by control levers 24B and 221. The control levers
246 and 24'! can be acted on by the arms 298
The clutch member 269 is permanently under
the pressure of the helical spring 266 so that
when released by the pawl 24!, it is moved to-'
wards the wheel 262' for the purpose of clutch
ing the cam discs II-V to the shaft I01.
When the pawl 24! is disengaged, the clutch
member 269 is free for axial and angular move
ment (Fig. 17).
Shortly before the end of '1/3
of a revolution, the sloping face of the next pro
jection 259 abuts against a corresponding‘slop
ing face on the arm 25'! of the pawl 24! which
has been again brought into action in the mean~
time. Consequently, the clutch member 260 is 15
displaced against the action of the spring 266
nd, as the projection 259 abuts against the head
of the arm 258 of the pawl 24l is held after ex—
actly 1/3 of a revolution. The cam disc II, chortly
after the'b-eginning of the rotation of the carrier 20:
261i presses on the ?nger 268 of thepawl MI and,
on further rotation, swings it against the action
of the spring 262 into'the locking position. In
this way, the rod 240 is again attracted to the
and 208' (Figs. 9, 10 and 13) which are adjust~
ably ?xed to the testing levers i58V and I581’.
The arrangement controlled by the rods 246
the levers 2&9 and 250 of the escapement mecha
nism. The pawl 2M is thus again held in its
and 24‘! operates as follows:—
locked position.
When the testing levers of the set B (Figs. 9,
left and then abuts on the front face of one of
the lever I581’ is pivoted clockwise, the arm 208’
During the rotation of the cam discs II—V for
one-third of a revolution, various levers are actu 30'
ated by these cam discs so as to in?uence the
moves away from the left hand end of the rod
printing hammer for striking the type to which
24? (Figs. 15, 1'7 and 18). At the same time, the
testing lever I58V of the set A is placed on‘ its
code disc and remains there until the ends ‘293
of the testing levers of this set A ?nd it possible
to engage in the discs in the so called testing po
sition. As long as the lever I58V is not fully en
the type wheel has been set or to prevent print
ing and effect desired switching operations. The
10 and 18) are removed from the code discs and
gaged, the arm 298 has no effective in?uence on
the right hand end of the rod 245. When, how
ever, the testing position is reached, (Fig. 18) the
rod 246 is pressed towards the right by the arm
298 acting under the in?uence of the pull of the
spring 206 which also accelerates the engage
ment in the code discs of the set of testing levers
A. The T-shaped lever 248 carrying the pin 252
_is thereby pivoted clockwise as is therefore the
lever 249 against the front face of which the rod
249 has, up till now, been pressed. The lever 250‘
5'; is also caused to turn by the spring 25!.
The rod 299 moves towards the right under the
pull of the spring 242 and arrives in a position
between the levers 249 and 250 and thus prevents
the full pivotal movement of the arm 250 which
remains in an intermediate position, (Figure 17)
and causes the spring 25l to be extended.
It is only when, later on, the rod 249 is tempo
rarily pressed towards the left that the arm 250
will move from its intermediate position under
the in?uence of the tensioned spring 252 and
abut against the arm 249 which has been swung
into its extreme position (Fig. 19). The rod 240
now abuts against the front of the pivoted arm
259. It is only when the set of testing levers A
. has been made inoperative and the levers of the
set B are placed on the code discs and have en
gaged therein and the pivoted levers 249, 250 are
swung counter-clockwise, that the rod 249 and
with it the pawl 24l are released.
There are three diamond shaped projections
259 spaced at equal intervals on the circumfer
ence of the clutch member 260 (Fig. 16).
By
means of these projections, the cam discs II-V
are released for the duration of one-third of a
75 revolution of the shaft I09. The cam discs II—V
cams of the cam discs II—V also serve for the
displacement of the paper to be printed and of
the ink ribbon. This is not illustrated in detail
35
as it is of no importance as regards the inven
tion.
We claim:
1. Type printing apparatus comprising a se
40
lecting device for determining a type according
to received code current impulses of the Baudot
type, said selecting device comprising a type
wheel, a set of selecting discs connected to said 45
type wheel, means for rotating said selecting discs
and said type wheel, a set of testing members
adapted to control said selecting discs, a setting
device for setting said testing members relatively
to said selecting discs, means for rotating said
setting device, means for setting said setting de
vice during its rotation, a magnet adapted to- be
in?uenced by said code current impulses and pro
vided with an armature adapted to in?uence the
setting of said setting device, and means acted
upon by said setting device during its rotation
whereby to set said testing members successively
under the in?uence of said means for rotating
said setting device and in dependence upon said
armature.
2. Apparatus as claimed in claim 1 in which
said means for setting said setting device dur*
ing its rotation comprise a stationary disc pro
vided with cams on its-circumference adapted to
displace said setting device axially during its 65
rotation.
3. Apparatus as claimed in claim 1, in which
said means for setting said setting device during
its rotation comprise a ?xed disc provided with
a ring of cams arranged in pairs diametrically
opposite each other and adapted to act simulta
neously on said setting device to displace it ax~
ially.
4. Type printing apparatus comprising a se
lecting device for determining a type in accord
2,120,850
ance with received code current impulses of the
Baudot type, said selecting device comprising a
type wheel, a set of selecting discs connected to
said type wheel, means for rotating said select
ing discs and said type wheel, a set of testing
members adapted to control said. selecting discs,
a rotary se’t'ng device for setting said testing
nembers relatively to said selecting discs, a mag
net adapted to be influenced by said code cur—
10 rent impuises and having an armature adapted
to in?uence said setting device, a cam disc
clutched to said setting device, means acted upon
by
successively
to displace
by said
the cams
armature
of said
intermittently
cam disc
dur“
15
ing rotation of said disc towards the pole of said.
magnet, a stationary cam disc, means acted upon
7
selecting discs, a set of testing members on said
last mentioned, shaft adapted to control said se
lecting discs and arranged for axial and rotary
displacement on said shaft, projections on said
testing members whereby each of them is sup
ported by the testing member below it in each
of its axial positions, a setting device for axially
displacing said testing members, means for ro
tating said testing members about their axes, a
magnet adapted to be influenced by said code 10
current impulses and having a projection adapt
ed to in?uence said setting device.
7. Apparatus as claimed in claim 6, in which
said selecting discs are provided on their circum
ference with grooves and humps and said testing 15
members are provided with noses adapted on ro
release said setting device for axial displacement
under the action of said spring, at the earliest,
tation of said testing members to be brought to
lie on the circumference of said selecting discs
and, on rotation of said discs to engage in said
grooves in said selecting discs whereby to stop 20
directly rotation of said selecting discs‘.
8. Apparatus as claimed in claim 6, compris
ing also a spring acting on said testing members
and tending to rotate them as a whole about
their axes,‘ said means for rotating said test 25
ing members being constructed as a rotary disc
at the same time as that at which the cams of
said movable cam disc release said armature of
trolled by said controlling cam. acting on said
successively by the cams of said stationary disc
whereby to intermittently displace said setting
device axially during its rotation, a spring acting
on said setting device and opposing said axial
displacement of said setting’ device; said set
ting device, the cams of said movable cam disc
the cams of said stationary cam disc being so
arranged that the cams of the stationary cam disc
said magnet.
’
5. Type printing apparatus comprising a se
ecting device for determining a type in accord
ance with received code current impulses of the
Baudot type, said selecting device comprising a
type wheel, a shaft for said type Wheel, two
selecting discs arranged one beside the other
on
shaft and connected to said type wheel,
means for rotating said selecting discs and said
type wheel, a set of testing members adapted to
control said selecting discs and arranged for
displacement
parallel to the shaft of said select
40
ing discs, a setting device for setting said test
members relatively to said selecting discs, a
shaft for said setting device, said setting device
being arranged for axial displacement on its
shaft, means for rotating said setting device,
45 stationary means for periodical axial displace
ment of said setting device during its rotation,
a spring acting on said setting device in opposi
tion to said means for axially displacing it, a
magnet adapted to be in?uenced by said code
c1v
nt impulses and provided with anarmature
adapted to hold said setting device in its axial
ly displaced position against the action of said
spring, means acted upon by said setting device
in its axially displaced position whereby to set
said testing members successively out of their
normal position under the in?uence of said
means provided for its rotation, a rotary re
setting device for said testing members set in
rotation by said means for rotating said setting
(30
device and disposed in advance of said setting
device in the direction of rotation of the latter,
means acted upon by said resetting device
during its rotation whereby to return said test
ing members successively into their normal po
sition.
I
6. Type printing apparatus comprising a se
lecting device for determining a type in ac
cordance with received code current impulses of
the Baudot type, said selecting device compris
a type wheel, a shaft for said type wheel,
two selecting discs arranged one behind the. other
on said shaft and connected to said type wheel,
means for rotating said selecting discs and said
75 type wheel, a shaft parallel to the shaft of the
comprising a controlling cam and a lever con“
testing members for holding said testing mem
bers against rotation by said spring and for al
lowing such rotation.
'9. Type printing apparatus comprising a se
30
lecting device for determining a type in accord
ance with received code current impulses of the
Baudot type, said selecting device comprising a 35
selecting wheel, two sets of type discs connected
to said selecting wheel, each of said two sets of
type discs being of similar construction and be
ing displaced relatively to each other through
180°, means for rotating said sets of selecting 40
discs and said type wheel, two sets of testing
members, one set of selecting discs being asso
ciated with each of said sets of testing mem
bers, means controlled by each of said sets of
testing members for controlling the associated 45
set of selecting members, the testing members
of each set having axes of rotation parallel to the
axis of rotation of said selecting discs, the test
ing members of each set being provided with
projections for mutual support of the testing 50
members. of a set, a spring for each set of test»
ing members striving to rotate all the testing
members of one, set as a whole about their axes,
said testing members being provided with noses
adapted, on said testing members being rotated
about their axes, to be brought to lie on. the cir
cumference of said selecting discs, a control lever
for each of said sets of testing members for pre
venting and for allowing movement of each set
of testing members under the influence of said 60
spring, a rotary disc provided with
control
cam for controlling said levers in such a Way
that at any time there is only one set of test
ing members which is rotated under the in?u
ence of its spring, a rotary setting device, a 65
magnet adapted to be in?uenced by said code
current impulses, said magnet being provided
with an armature adapted to influence said set—
ting device, and means acted upon by said set
ting device during its rotation whereby to dis
place the testing members of said two sets axial
ly relatively to said selecting discs.
10. Type printing apparatus for printing type
characters comprising a selecting device for de
termining a type in accordance with received
8
2,120,850
code current impulses of the Baudot type, said
selecting device comprising a type wheel, a set
of selecting discs connected to said type wheel,
means
rotating said selecting discs and said
type wheel, a set of testing members adapted to
V in?uence said selecting discs, said testing mem
bers being displaceable relatively to said select
ing, discs, a rotary setting device for said testing
members, a magnet adapted to be in?uenced by
10 said code current impulses, said magnet being
provided with an armature adapted to in?uence
said setting device, means for rotating said set~
ting device through one revolution, said last
mentioned means being controlled by the arnia»
15 ture of said magnet and means for rotating said
setting device relatively to said means for ro
tating it through one revolution.
‘r1. Type printing apparatus comprising a set
of code discs, a typewheel, means for rotating
20 said code discs and said type wheel in-unison, a
magnet adapted to receive a train of current im
pulses of the Baudot type, a set of testing mem—
bers mounted for independent displacement,
means for arresting said code discs and said type
25 wheel in various positions dependent upon the
relative setting of said testing members, a source
of power other than said magnet and means un
der the in?uence of said source of power for ef
iecting said relative setting of said testing mem
30 bers in accordance with the current impulses re
ceived by said magnet.
,
7
12. Type printing apparatus comprising a se
lecting device for determining a type-in accord
ance with received code current impulses of the
Baudot type, said selecting device comprising a
type wheel, a set of selecting discs connected to
said type wheel, a set of testing members adapted
to conrtol said selecting discs, a rotary member
mounted for axial displacement during its rota
40 tion, means for rotating said rotary member, sta~
tionary means for displacing said’ rotary mem
ber axially during its rotation in one direction as
said member passes through particular angular
positions, a spring urging said rotary member
45 axially in the other direction in all angular posi
tions of said member, a magnet operated by said
code current impulses and having an armature
adapted to. hold said rotary member against dis
placement by said spring, and means acted upon
50 by said rotary member during its rotation where
by to set said testing member selectively in ac
cordance with the axial displacements of said ro
tary member.
13. Type printing apparatus comprising a se
55 lecting device for determining a type in accord
ance with received code current impulses ‘of the
Baudot type, said selecting device comprising a
type wheel, a set of selecting discs connected to
said type wheel, means for rotating said selecting
60 discs and said type wheel, a set of testing mem
bers adapted to control said type discs, a setting
device for setting said testing members relatively
to said selecting discs comprising a rotary arm,
a ring adapted to rotate with said arm, means for
rotating saidrarm, a stationary disc provided
with camsadapted to displace said arm axially
during its rotation, a spring constantly urging
said arm towards said stationary disc, a stop
adapted to engage between said ring and said
disc whereby to hold said arm against displace
ment ‘by said spring, electromagnetically con
trolled means adapted, under the in?uence of
said code current impulses, to determine the en—
gagement of said step between said ring and said 10
stationary disc and means acted upon by said
arm during its rotation whereby to set said test
ing members selectively in accordance with the
axial displacements of said arm.
14. Apparatus as claimed in claim 13, in which 15
said electro-magnetic means comprise a magnet
having an armature to which said stop is yield
ingly connected.
15. Apparatus as claimed in claim 12, com
prising also a cam disc adapted to move with 20
said rotarymember, the cams of said cam disc
being adapted to press said armature in a pre
paratory manner towards the pole of the magnet.
16. Apparatus as claimed in claim 12, com
prising also a rotary cam disc adapted to be ro
25
tated together with said rotary member and hav
ing a, plurality of cams adapted to press said ar
mature towards the pole of said magnet periodi
cally during the reception of said code current
impulses, said cams being arranged so as to act 30
successively on said armature and being made of
increasing lengths.
17. Apparatus for printing types selected in
accordance with received current impulse signal
trains of the Baudot type, comprising a type 35
wheel, two sets of selecting, discs, means for ro
tating said type wheel and said selecting discs in
unison, two sets of testing members associated
one with one and the other with the other of
said sets of selecting discs, a magnet actuated by
said received current impulse signal trains,
means controlled by said magnet on receipt of
successive trains for alternately setting the test
ing members of said sets of testing members into
relative positions corresponding to the received
train, means for bringing said sets of testing
members individually with their testing mem
bers in said relatively displaced positions into
contact with the associated selecting discs where
by to cause rotation of said discs to be arrested
when said discs assume an angular position de
termining the selection of a type on said wheel
corresponding to the received train, and a print
ing device comprising means .for producing an
impression from said selected type, rotary means Ul. LT
controlling said type impressing means, a clutch
controlling the rotation of said rotary means and
an escapement mechanism controlling said
clutch, said escapement mechanism being con
trolled by said trains of testing members.
60
MAX AMANN.
ALFRED LAHL.
HANS HATZINGER.
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