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Патент USA US2404814

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„my s@ m.
Filed Jan. 24, r1945
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2 _Sheets-Shee‘t l
«MY 3Q, 3946.
LF. Rami-:OLD ET AL.
Filed Jan. 24, 1945
2 sheetsfsmt 2
Patented July 30, 1946
Leonhard F. Reinhold, Staten Island, N. Y., and
James A. Spencer, Teaneck, N. J., assignors to
Radio Corporation of America, a corporation of
Application January 24, 1945, Serial No. 574,288
10 Claims. (Cl. 178-69.6)
'I‘his invention relates to selectors and more
particularly to a device for conditioning appa
ratus to be controlled from a remote point.
In the printing telegraph art, as Well as in the
cept that certain of the parts have been moved
art relating to remotely controlled indicators, re
corders and switching mechanisms, it is frequent
ly required that a station selector be provided for
conditioning the receiving apparatus to function
into operating positions;
Fig. 3 shows a fragmentary view of' the struc
ture as in Figs. 1 and 2, where va further step of
operation is indicated;
Fig. 4 shows an edgewise view of the mechanism
indicated in the other figures, this figure being a
cross section on the line 4-4 of Fig, 3; and
in response to code signals. This is especially
Fig. 5 shows in perspective a portion of the se
true where such apparatus is normally to be held 10 lecting cam and associated levers.
in a standby condition which would relieve it
As a background of art to which this invention
from continuous operation until after reception
relates reference is made to our co-pending ap
of a selecting signal.
plication Serial Number 485,186 which was filed
Accordingly, it is an object of our invention to
April 30, 1943, now U. S. VPatent No. 2,375,828,
provide a selector which may be suitable as a sta 15 patented May l5, 1945, covering a Printing tele
tion selector in a telegraph system or in any ap
graph receiver. In that application we described
plication of remote control principles. to an indi
a typewheel printer having internally notched
cator, a recorder or a switching mechanism.
code rings which were arranged and adapted to
It is another object of our invention to provide
be permutationally set in response to code signals
auxiliary equipment to be controlled by a code 20 for the purpose of orienting the printer type
selecting receiver so that that receiver, although
wheel. The typewheel shaft was caused to ro
maintained normally in condition to respond vto
tate to a printing position, the character was then
code signals, shall require further conditioning
printed, and the shaft was then rotated further
in order to translate traffic code signals into in
to a homing position.
We now propose to utilize the principles of code
It is a further object of our invention to pro
signal selection as set forth in said «co-pending
vide a station selector which responds to the cyclic
application for the purpose of orienting a shaft I
setting of an orientable shaft in different posi
as shown in the drawings of the instant applica
tions which are permutationally varied for dif
tion. We also propose to utilize the srtucture, or
ferent stations so that individual stations may be 30 its equivalent, as shown in said co-penlding appli
selected from a remote point.
cation for cyclically rotating an operating` cam
Still another object of our invention is to pro
shaft 2, as shown in the drawings of the instant
vide a plurality of selectors each associated with
application. 'I‘he code responsive mechanism
one of a group of receivers in a telegraph system,
forms no part of the instant invention and is not,
and each selector having means for responding to I therefore, shown or described herein. It is suffi
a train of code signals individual to itself. A
cient to understand that, in response to code sig
feature of our selector meetsI a certain require
nals as received at any given station, the shaft
ment that any unwanted selectors which may re
I may be rotated into a selecting position where
spond to a given code combination of a series of
it is arrested momentarily, and that, preceding
code signals shall be tripped out of action upon
and following the cycle of selective orientation of
receipt of a subsequent code combination. Thus
the shaft I, the shaft 2 is rotated from a position
only the one selector which is set to respond to a
of rest through one cycle and then stopped.
predetermined series of code combinations, step
Any desired selecting function may be per
by step, will be conditioned for further function
formed by the station selector as herein shown
ing. The other selectors of the group will auto 45 and described. The ultimate accomplishment of
matically drop out.
Our invention will now be described in more
the selector may, for example, be the starting of
a motor, or the tripping of a clutch, or the clos
ing of a relay circuit.
drawings in which
Mounted on the shaft I are two discs 3, 4, each
Fig. 1 shows a system of cams and levers for 50 of which is formed with a digital projection, and
producing selective responses to code signals and
two other discs 5 andi, each of which is formed
for producing an ultimate response by way of
with a single notch in its periphery. The digit
closing a circuit when the selecting function has
and notch of two discs 3 and 5 respectively are
been completed;
correspondingly oriented. The same is true with
Fig. 2 shows the same structure as in Fig. 1 ex 55 respect to the digit and, notch of the discs 4 and
detail, reference being made to the accompanying
a stationary holding rod and serves to apply pres
6 respectively. At diiîerent receiving stations in
a given system the angular displacements of Athe
sure between the roller 39 and the cam 1.
Cooperating with the cam 2l is a cam follower
roller 24 which is mounted on the upper end of a
digits with' respect to a reference point on the
shaft I are varied so as to enable diiîerent call
signals to be responded to by each station.
Another cam 1 is mounted on the shaft I and
is usedîfor restoring .the selecting§mechanisnrto
A pair of step-cut plates 8 and 9 is shown
rotatably mounted on a shaft III. The two discs
are fastened onto a hub II and arev urged into a
push-rod 40. This push-rod is carried in a cylin
drical housing member 4I which in turn is sup
;.portedbygthe' front one >of the ¿frame plates 5I.
-~A coiled spring 42 acts under compression to urge
the cam follower roller 24 against the periphery
10 .of the cam 2|.
`.The ratchet plate 8 is formed integrally with a
projection 43 which normally rests on a stop pin
i'-44.„prior toz-beinglîstepped forward in a clock
homing position by means of a spring I2. An
operating pawl I3 is associated with-¿the plate
8. A similar operating pawl y'I4-'is-.associated with
» wise'direction. l"When, however, the plates 8 and
the plate 9. Pawls I3 and ld‘h'avehe‘elpieces I5 15? 9 have‘beeny `moved two steps the projection 43
engages one'of `the contact springs 45 for closing
and I6 respectively which are positioned for
a circuit. Suclfa. circuit may, for example, in
engagement with restoring; elevers. '..Each =,of.¿the
clude a magnetic clutch 46, or other device to be
pawls I3 and I4 is urged against the stepped face
selectively controlled. Power is supplied by. a
of its associated plate by means of a"sp"ring` I1.
These pawls are also .pivotally mounted at the 20 battery 41. A switch 48 is provided for opening
.».the-selecting;circuit. af ter; the; selecting .-'operation
slower. ends; Ofmperatingx-flevers <.I8zand I9.l respec
. has been'completed. -_ Of-,course theiresponsive'de
vice 46 maybe-of. any;desired'typev and may'op
¿'I'he"l .upperrportionsrofrievers il Banand .I 9-1 are
.tionally be constituted: as avbelL. ax’motor.' or.. an
¿somewhat :M5-shaped. `vThatzis toi-say, .they have
extensions such as I8a andzflßhîîth'e tfunctions of 25 .indicators-lier example. Furthermore;F when ¿the
. ratchet plate 8 is-»movedftoiitsrsecond'stepzitzmay
fwhich’fwill fpresentlyf be.;~«.clescribed. .ïAtf .the-i- end
~ be 4caused to` actuate` anyssort offdevicezmech'an
:of extension' :I Sli-ás.a:.downwardly1.extending'fmger
«icallyfinstead of electrically.
I8c which'frides png“ the f-pe'riphery; ofzthe-rcam-'E
-ands may f at :times ¿drop ’intoî the‘rnotchi` in; vthis
. The- `maerating procedure
cam. There issalsoe.aidownwardlyexten‘ding'1in
The operation of ourf` selector may`~be illus-`
trated vby consideringTñrst 'that'two code signals
.fing Eig?ö. ;'It‘.:;rides on ¿thecameGfand-may:drop
>frinto @aranotchî therein. ‘î The ilevers'îlßpand I9` are
are successively received, one“ òf vwhich causes the
,.=pivote‘d1.:onz;a ñXedfshaftlZll-fwhich Vis secured to
uthe'iframe plates 5I.
“'¿Thezshaftf 2: fhasfimounted thereon three' cams
`shaft I .to beV rotated >into position where thedigit
"on cam'3 -comes'directly under' the'fingerï 26h
andthe-notch in the disc 5 comes’directly'f'be
oraise‘d :..portion fforfîr controlling .I a. cam: follower.
"neath'ïthe‘ toe> piece "|8c. ‘The operation presently
to be A'desciï‘ibedfwill be'ïfollowed -by‘ the setting
:These :cam followers: are fof” vrollerîformation». and
-ofrthe shaft’ I` so- that' the ydigit on- the disc'L 4 is
“alignedzwith 'thef`ñnger '21h at theend of llever
~«are.;shown’frespectiv'ely: at7 positions.v 24 and’.y 25. à
"The .tworr'ollersi 25 `on ¿the `upper iside of 'the ‘shaft
are“=moun-ted« respectively at 'fthe' »left ends f( as
1 arm v21;v and -the> notch inthe' ldisc 6 comes direct
4‘ly/beneath »the'toe piece 19o. *Following Veach
.setting of `»the shaft I» »into a selecting position it
»viewed in"‘the"ïñgures) - of loperating leversV 2lil and
21. These lever.; are pivotallyim’ounted'respec- i
'-is» arrested’ for afsuflicient time soV that 'the se
rtivelyforr-'theL arms-ï-Ißaiandf 19a. f’lievers 26’ and I"
21 fea'chbhave r-fdownwar‘dlyf-«extending- arms 26a
lecting operation may be completed bythe rota
tion of fthey camïshaft- 2. -After' the performance
» andf~f21a,»~ and‘fthey' 'have 'horizontally extending
~ `‘of-each-«selecting operation -the -shaft I -is- caused
arms "ending-in" fingersl26b vandì 21h. ì‘The fingers
2617- and“ '2 1b“ are” normally >h'e'ldA `sliiliciently clear
`to/be-rotated toa‘horning position. VVThe shaft I,
therefore;=m'akes `one complete but interrupted
of"- discs* 3' and' 4‘- so`- that. theüligits` on these 'discs
‘may‘freely’ rotate. beneath'. them. " 'The clearance
`vi_s,; however, “closely adjusted“ by ‘means ofY a.. 'stop
member'28 which ¿spansthe .space between 'the
zframejplates‘SI `and i'sheldby'th'ese platesin any 55
desired, position ._ _of ...adjustment _about its Vexcen
...tric bearings 2.9.
@The rollersl 25...are- urged. downwardly.: against
„the perípheries of, the> cams.22 and 23 by virtue
.of _lthesspringctension ein. lsprings 3D „which f.. are
.ñxedlymounted at,.the lower. end Varid arehooked
into=the,levers"26.and"21 respectively.
...A' holding, pawl.3I.Tis...pivota_lly .mounted on a
shaft.' 32..,and ,is urged„againstY the. periphery, of
`.th'e_„.plate-.8.,]oy..meanssoff,aspring 33. »On»,.th’e .65
.hub . which .. carries, the pawl., 3 I , is .a , cylindrical
member 34 which is ».drüled` to. receive .a-push
rod 35. At the right hand endof. .the push-.rod
¿ a crossepim36-which'is„ they slot
:of î:ai.-bel1....c1:ankf.31. . Bell fcrank~31 _is -pivotally
.fmounted oniazstaff 38.1, and zits' rightV hand' exten
sion carriesacam- follower- roller-'39 which is po
.sitioned in-¿the sameA plane with,y andrides on,
.ther periphery-.of ¿cam 1. ¿1A-¿spring 50. is., con
nected.- between'onem'm otthezbelb crank'v 371 and
revolution-A in responseto ‘the reception »of each
code signal.
“The codesignals are received on- a code trans
lating ' device -:suchä as '-"shown lin . our- aforemen
tioned =co-p_ending :patent application, ’Serial
’Number 485,186», operating as a start-stop' device.
.Ther two shafts I' and'.A 2.are-` stationary untill the
lselecting A.magnets ‘> of ' the` code r translator have
been> actuated. 'These shaft " I'i-and" 2 are- then
.simultaneously i rotated; shaft I ‘beingf given. a
greater. velocity thanïthatv of shaft 2 so that any
selectedv position .around theA circumference of the
circle - may -be-.reached ‘while "shaft >`2 4rotates
>through:'substantially 180° more or less. Shaftv 2
thena‘b'rings its1cams22fand 23A up tothe posi
tions .shoWnïin "Fig,u l, immediately -' subsequent
to which the cam followers Am0un-ted»"onf'the
.leversN 21:' and 1' 26 are>` successively. lifted. f Cam
123: has-1a hump which actuates lever 21 prior" to
the actuation of lever 26 by a: similar Ahump on
:cam :22. If'the ñrstxcode .signal` to'be received
¿is-'Suchasto-position the digitÍ on disc 3L under
,theçñnger 26h, then .lever 26 willv beY fulcrumed
=,atithe tip 'ofv linger-2Gb and. will cause’ lever I8
to be rotated on its pivot bearinguîß. îThis rota
tion of `lever;.l8 is .at .thistime-apermittedî by the
position-ing of the notch in cam 5 so that it may
be entered by the toel piece I8c. The result is to
move the pawl I3 to the left and to rotate the
ratchet disc 8 through an arc represented by one
step, or the distance between the two steps of
discs 8 and 9.
After the discs 8 and 9 have been moved one
step, as above described, the shafts I and 2 are
second step of the selecting cycle will then be
completed after restoring the shaft I to its hom
ing position.
Then the digit on cam 4 is for a.
second time brought around and stopped under
neath the linger 2lb. At this time the pawl I4
will operate to advance the ratchet disc 9 to the
end of its course where the projection 43 is
brought into engagement with the under-contact
returned to their homing positions where they
45 for closing the circuit to the device 46.
are_de-clutched from their driving motor (not 10
Restoration of the discs 8 and 9 to normal is
shown) until after reception of `a second code
accomplished at different times under varying
selecting signal. Such a signal may, for exam
ple, result in the positioning of shaft I so that
the digit on disc 4 comes directly beneath the
conditions as will now be explained.V
( 1) The ñrst condition to be considered is
_ where the selector has operated at unwanted
This selective setting operation is 15 stations to advance the ratchet discs 8 and 9
finger 2lb.
then followed by the rotation of the cam shaft
2 through positions which will cause the actua
tion of levers 26 and 21 for a second time. Since
lever 21 operates prior to lever 26 and since it
is now caused to be fulcrumed at the tip of finger
2lb, the pawl I4 will be moved to the left while
engaged with the stop on disc 9, thus moving
the discs 8 and 9 to their most advanced posi
tion where the extension 43 engages with the
lower one of the contacts 45 and closes the cir
sponse to the completed selecting operation.
cuit of device 46 for providing the desired re
sponse to the completed selecting operation.
The 4advancing movement of pawl I4 is immedi
ately followed by an ineiïectual release action
through the rotation of lever 26 on its pivot bear
ing`49. This release action is ineffective because
the pawl I4 has already been engaged against
the step of disc 9 and has driven the two discs
8 and 9 forward so as to be held by the pawl 3|.
It should be constantly born in mind that our
selector is arranged to set up conditions in any
one of a plurality of receiving stations so that
the subsequent transmission of intelligence sig
through one step. At these unwanted stations
the discs 8 and 9 must be returned to normal
at the time of a reception of the second selecting
code signal. At these unwanted stations, there
20 fore, if they have been partially selected, the
rotation of lever 21 on its pivot center 49 will
kick out the pawl I"4 because there is no position
ing of the digit on cam 4 under the finger 2lb.
The selectors at the unwanted stations having
25 been dropped out by this operation will then be
in readiness for response to a full complement
of selecting code signals if any one of these sta
tions‘is subsequently required to be selected.
` `
(2) After the ratchet discs 8 and 9 have been
30 fully advanced by reception of two code signals ’
which are capable of accomplishing this fullad
vancement, the code discs 8 and 9 can only be
restored to normal inresponse to a special code
_ signal designated for this purpose. Such a signal
35 is arranged to orient the shaft I so that atits
point of arrest the bell crank 31 will be moved
into its actuated position for driving the push
rod 35 into the path of the push rod 40. The
push rod 35 now stands in this position while
nals shall be responded to at only one station. 40 the cam shaft 2 rotates to the point of position
Accordingly, the selecting code signals which are
ing the opposing humps on cams 2I and 23 in a
to be used for making a station selection will
vertical axis. The push ro`d 49 is, therefore, de
be varied permutationally. That is to say, the
pressed atthe same instant that lever 2l is caused
digits on cams 3 and 4 will be differently disposed
to rotate on the pivot center 49 `and to kick out
in angular relation to a common reference point
the pawl I4. Pawl 3| will be simultaneously
on all of the shafts I at diiferent stations to be
kicked out so that the ratchet disc 8 will return
individually served byvtheir selectors. It is, how
half way to` the point where it will be held by
ever, within the scope of the invention to provide
pawl I3. A further rotation of the Cain shaft -2
cams 3 and 4 and associated cams 5 and 6 so
now causes lever 26 to be actuated for kicking
arranged that in addition to being able to re 50 out pawl I3. The complete restoration of the
spond individually at different stations to ap
cams 8 and 9 is, therefore, accomplished and all
propriate selecting signals, all stations may be
elements of the selector are returned to their
simultaneously called in response to a special
homing positions.
code signal. For enabling all stations to respond
It is contemplated that in certain instances
simultaneously, therefore, it is only necessary to 55 selection of a station may require the transmis
provide two digits on each of the cams 3 and 4.
The reference points of the digits which are used
for individual station calling will then be as
sion of three or more selecting code signals rather
than only two as herein shown and described.
In such case the lever mechanism including the
shown and described, while the reference point
combination of levers 26 and I8 and their asso
of the cam digits for the universal calling signal 60 ciated pawls and cams will of necessity be in
will be uniform at all stations. If desired, the
two digits on cams 3 and 4 for universal calling
may be given the same angular disposition with
creased in number. By arresting the shaft I in
successively different positions corresponding to
sequential action of the two levers 26 and 2'I it
mentof such ratchet plates until the extreme
position of advancement is reached. This modifi
the digital arrangement on the cams 3, 4 and
respect to the common reference point on shaft
the like, the ratchet plates 8, 9 and the like may
I. Due to the fact that the humps on cams 22 65 be engaged by different operating pawls,V each
and 23 are disposed at an angle to each other for
taking its turn in producing stepwise advance
will be seen that when the digits on cams 3 and 4
are simultaneously situated under the fingers
cation of our invention will be readily under- '
26h and 2lb that, although pawls I3 and I4 are 70 stood by those skilled in the art without further
both moved to the left, pawl I3 only will be
illustration or description.
effective in advancing the ratchet disc 8 in re
We claim:
sponse to the first code signal setting of the cam
1. A selector of the type which is controlled. by
3. Pawl I4 returns in time to act as a holding
a telegraph receiver `responsive to oodle Signals,
pawl against the step in ratchet disc 9. The 75 said selector comprising a plurality of selecting
of „selecting signa1s,„a-.settable rotor. and a; »plu
rality> of coaxially mounted cams, the -rotor and
cams being vmounted on two different shafts l>for
actuating each selector unit, and being subject
discs-.eachycarrying a projecting digitand each
firmly; mounted-on a- shaft the orientation» `of
which is selectively obtained by said telegraph
receiver,v anv operatingcam shaft having a piu
to control by said telegraph instrument, a device
ralítyof cams thereon, each cyclic revolution
to be actuated by Yadvancement of the ratchet
of which-is effected subsequent tothe reception
discs to a predetermined step, a pawl4 retracting
of each selecting code signal, said orientable shaft
system operableto disengage andrelease the par
beingarrested in a signal-controlled position dur
tially advanced ratchet discs at all but a-selected '
ing a partV of said cyclic revolution, a ratchet and
pawl combination corresponding to each of said 10 one of said stations, a holding pawl> operable to
retain the ratchet discs of the unit at the‘ïse
selecting discs, the several ratchets being rotat
lected station in its advanced position, and code
signal responsive means for unlatchi'ng said hold
ing pawl and for restoring the entire selecting
able as a unit, an operating lever for individually
supporting each pawl, the several levers having
a common pivot, a cam follower lever linked to
each Vsaid pawl operating lever, means operable 15 unit to normal at the selected station.
6. A selector comprising a settablerotor having
two digit-carrying discs and two notched discs,
cam‘follovver lever when the associated selecting
by an appropriate one of said cams through its
the orientation of a digit and a notch being `the
same in one cooperating set of discs and the same
disc is oriented into a selecting position for caus
ing that cam follower lever to be pivoted `at the
apex of the digit on that disc, whereby the asso
20 in the other cooperating set, the orientationl of
the two digits being predetermined with respect
ciated pawl is actuated for stepwise advancement
of its ratchet, and meansV responsive to a condi
to a reference `meridian so as to render this se
lector alone among a group of selectors respon
sive to a giventrain of codesignals, a cyclically
selecting `position for causing the associated
25 operable cam shaft, cams on said shaft, two cam
tion of orienting ‘a selecting disc into a non
ratchet to be released by its pawl.
follower levers arranged to ride the peripheries
of said cams, each lever> having a linger for feel
2. A selector ofthe type which responds cycli
cally to the orientation of a variously settable
shaft and to the driving force of a start-stop
cam shaft, said selector comprising at least two 30
ratchet discs rotatable as a unit about a ñxed
axis and having a staggered relation between a
ratchet step of one disc and that of the other,
a plurality of levers each carrying a pawl for
engagement with a respective one of said ratchet 35
discs and swung on a common axis, cams mounted
on said cam shaft, a cam follower lever opera
ing the presence or absence ofa rotor disc digit
in a selected position, two ñxedly pivoted paw-l-r
carrying levers each linked to a respective -one Vof
said cam follower levers and having> a> >pawl
pivotally mounted on one extension thereof lwhile
a toe piece terminating another extension there
of is arranged to ride the periphery of a respective
one of said notched vdiscs and at times. to seat it->
self in the notch, a ratchet disc assembly subject
to stepwise advancement by saidpawls when a toe
tively associated with each said cam and with
piece enters a disc notch, and means for unlatchfa corresponding digit-supporting disc which is
ing a pawl during a cycle of the cam shaft when
mounted on said settable shaft, each said vcam 40 the rotor is set to a non-selecting position.. f
' follower lever being linked to an extension arm
7. In a cam-driven ratchet-and-pawl actuator
on a respective one of said pawl carrying levers
for a selector, a rotor having a .homing .position
and being movable by a peripheral hump on an
and means for variably orienting the same in dif
appropriate one Vof said cams in either of two
ferent selected positions, a plurality jof disc> sets
modes depending upon the orientation of said
on said rotor, ,each set comprising a Vdisc having a
settable shaft to arselecting or a non-selecting
radially. extending digit and a discV havingV a
position, one of said modes being effective to ad
notch the meridian of which is the same as thatY
vance a pawl _so as to step forward its ratchet
of said digit, the angle between two digits being
disc, and the other of said modes being effective
predetermined in accordance with successive po-.
to release a' pawl from its ratchet disc, and means 50. sitions of orientation which are chosen for con- Y
operable by said ratchet disc unit after advance
trol of the selector, a pivoted ratchet disc assem
ment thereof through a predetermined’number
of steps for giving effect to the completion of the
operational steps of the selector.
bly `comprising a plurality of discs with stepped
peripheries, and a lever system for advancing said
assembly step-by-step through apredeterminedY
_ 3. A selector according to claim 2 and including 55 arc, said lever system including pawl-carrying
means operable by a third cam on said cam shaft,
' levers and pawl-Vunlatching levers', each pawl
butisubject to selective control by setting the
carrying lever being ñxedly pivoted and integrally
orientableA shaft into a position which is reserved
for a restoring operation, whereby the ratchet
disc unit is unlatched and allowed to be retracted
formed with a toe-piece extension for entering the>
notch of one of said rotor discs respectively, each`
paWl-unlatching lever having a ñnger for oppos
ing the digit on one of the digit carryingl discs
respectively, and also having a cam follower eX
tension and a pivotal linkage with a compan
to a homing position, .
4. A selector according to claim 2 and includ
ing means for unlatching the ratchet disc at the
ionate one of the pawl carrying levers. _
position of an intermediate step of advancement
upon rotation of the cam shaft after setting the 65; 8. In a selector, the combination according to
orientable shaft to a non-selecting position.
claim '7 and including re-set devices of two types
for restoring said ratchet disc assembly >to a nor-`
5. A system of selector units‘located at dif
mal position, Vone typ-e being effective through one
of said unlatching levers to release the ratchet
disc assembly from an intermediate step of ad
vancement, and the other type including a hold
ing pawl which engages the ratchet disc assemblyk
only at the last step of advancement and is/jun
latched therefrom in response to the setting of
ferent stations, each unit being mechanically
coupled to a receiving telegraph instrument, each
selector'unit comprising ratchet discs to be ro
tatably advanced step-by-step-in response to the
reception of selecting code signals, a lever sys
tem including a plurality of pawls arranged and
adapted to effect said step-by-step advancement
of .theratchet discs in response to the reception
said> rotor ,to acontrolling position for this func-f
tion, and cam driven means for producing the un
latching movement of said holding pawl.
sponses of said selector, a holding pawl effective
to retain the ratchet member at the extremity of
9. In a call selector, the combination of tele
graph receiving means for setting a rotor to dif
its advancement, and means responsive to the re
ception of a code signal of “sign-01T” signiñcance,
ferent selected stops, at least two successive set
tings being required to complete a selecting op
eration, a cyclically operable cam shaft and lever
which signal is manifested by the setting of said
rotor to a special stop, whereby said holding pawl
mechanism driven by cams on said shaft under
control of indexing devices on said rotor for pro
ducing either a selecting response or a non-se
lecting response to the reception of a code signal,
a ratchet member subject to stepwise advance
ment by pawls which are propelled by said lever
mechanism, and subject to tensional retraction
upon unlatching said pawls, feeler extensions on
elements of said lever mechanism for engagement
with said indexing devices, thereby to differen
tiate between selecting and non-selecting re
is subject to an unlatching movement which is
cam-propelled upon revolution of said cam shaft.
10. The combination according to claim 9 and
l() including means under control of said rotor when
set to a non-selecting stop for causing a pawl to
be disengaged from a step in said ratchet 'mem
ber and for preventing the stepwise propulsion of
that same pawl, whereby the ratchet member is
released from an intermediate step of advance
ment and permitted to be retracted.
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