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Патент USA US2404813

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July 30, 1945-
Filed Oct. 7, 1944
2 Sheets-Sheet l‘
July 30,1946.‘
Filed 091;. 7, 1944
2 Sheet_s-Sheet 2’
I S’psAlcb-e
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 Delaware
‘ Application October 7, 1944, Serial No, 557,620
9 Claims.
(Cl. 178-34)
This invention relates to printing telegraph ap
paratus for which our misselection indicator is
paratus and more particularly to improvements
particularly well adapted, the selecting mecha
in mechanisms for causing the printing of an
nism includes internally notched code rings.
error symbol whenever the selecting mechanism
These rings are coaxially disposed with respect
of the printer is improperly operated.
5 to a typewhee1 shaft which carries a seeker.
In the transmission of telegraphic code sig
Selected rings are rotated through a slight angle
nals, quite frequently electrical disturbances
in order to bring their code notches into align
cause the signals to be mutilated. The selecting
ment in different positions about ‘their inner
mechanism then fails to operate in accordance
edges. The seeker rotates ‘when released after
with a true code signal and the proper character 10
cannot be printed. In order to distinguish be
tween a failure to print and an instance where
a space should be shown between two printed
characters, it is desirable to indicate the receipt
setting up a certain combination of the code
When ‘the seeker ?nds an alignment. of
code notches, it is arrested 50 that the type
wheel mounted on the same shaft with the seeker
may be in a position for printing a selected
of a false signal or a combination of code im-_ 15 character.
After a printing operation the shaft
carrying “the typewhee1 and the seeker is then
pulses which does not represent a true character
permitted to resume rotation. In certain types
of printers using the internally notched code
rings the typewhee1 rotates from one. selecting
been received and that the code selecting mech 20 position to another and has no homing posi
anism of a printer has been incorrectly operated.
tion. In another type of such printers, as il
lustrated in our copending application Serial
It is another object of our invention to provide
an error detector for use with a printer having
No. 485,186, ?led April 30, 1943, now U. S. Patent
a rotatable typewhee1 shaft and having inter
No. 2,375,828, issued May 15, 1945, a homing
nally notched code rings for selectively position 25 position is provided ‘for the typewhee1 shaft. In
this. case the error detecting position is located
ing the typewhee1 to print a character.
at a slight angle to the homing position. The
_It is still another object of our invention to
instant application discloses illustratively two
provide ‘an error detector which is readily
adapted for use with typewhee1 printers regard
embodiments of misselection mechanism. One
less of whether the construction of the printer 30 embodiment is suitable for use with code ring
selectors which are associated with a typewhee1
is arranged to have a homing position or no
shaft having a homing position. The other em
homing position for the typewhee1 shaft.
bodiment is useful when no homing position is
Another object of our invention is to provide
It is an object of our invention to provide
means for indicating that a false signal has
an error detector adaptable to a selecting mech
anism for orienting a rotatable shaft, the error 35
detector being arranged to cooperate with a
Our invention will now be described in more
detail, reference being made to the accompany
ing drawings, in which:
search arm on the orientable shaft and to arrest
Fig. 1 is a front elevation of a preferred em
the search arm in a suitable position for indi
bodiment of our misselection indicator in com
cating a misselection.
Another object of our invention is to provide 40 bination with selecting mechanism of the type
having internally notched code rings;
an error detector for use with apparatus of the
Fig. 2 is a plan View of the misselection mech
type above referred to, wherein the orientable
anism as used with a selector the orientable
shaft is brought to an error detecting position
shaft of which has a homing position;
whenever the number of selecting code rings ac
Fig. 3 shows a vertical cross-section of the
tuated is more or less than the proper number 45
misselection mechanism taken along the line
‘for true selection.
Another object of our invention ‘is to v‘provide
an error detector comprising a system of Wedge
3--3 in Fig. 1;
Fig. 4 shows another plan view similar to that
of Fig. 2, but modi?ed for association with a
members having spacers movable along tapered
portions thereof for expanding or contracting the“ 60 selector the orientable shaft of which has no
homing position; and
spaces between the wedge members and so actu
ating a detent which is associated with a rotat
able search arm for the purpose of arresting
this arm in position to indicate misselection.
In a preferred type of printing telegraph ap
Fig. 5 is a perspective view showing how the
rotatable stop arm I0 is arrested and released
by the detent l3a. ‘
The aforesaid objects of our invention are pref -
the‘error detecting lug II into the path-of the
ception of di?erent code signals, said means for
stop arm I 0; The movementof a plurality of the
spacer members 21 into position to close up the
producing an error detecting response including
wedge members 28 has no further effect, re
gardless of how many code rings are actuated.
’ Referring now to Fig. ‘l in connection with
Fig. 1, we show a modi?cation of the misselection
3. In. an error detector which responds to th
reception of mutilated‘code signals, a plurality
of wedge members each separately pivoted at one
a detent forintercepting said stop-arm. -
end and being tapered inwardly from their free
mechanism which is adapted to selectors having
ends, a plurality of spacer rods each having a
no homing position for the typewheel shaft 9
portion slideable against the tapered edges of
and its associated members mounted ‘thereon. 10 said wedge members, means responsive to the re
The detent I3a has a single lug member I la which
ception of different code elements'of a signal ‘for
is slotted at 36,‘ Fig. 4 is shown with three of
independently actuating said spacer rods where
the spacer ‘members, 28' moved into position to
by the disposition of the wedge members is'vari
allow contraction of the wedge members and
ably expanded and contracted, a rotatable stop
movement of the detent I3a into a position cor 15 arm mounted on a shaft to be variably oriented
responding to a proper selection of three code
for translating received code signals, and a de
rings. In this position, the stop arm I0 is un
tent having two lugs arranged and adapted to
opposed by the lug I I a and is free to pass through
intercept said stop-arm at either of two positions, .
the notch 36. The typewheel shaft 9 is, there
namely, a homing position and an error desig
fore, caused to rotate to a selected position de 20 nating position, said detent being actuated by
termined by the alignment of code notches in
the rings I. After printing a selected character
expansion and contraction of said wedge member
the code rings may be reset to a different com
4. A device according to claim 3 in which the
bination, and, if in so doing, response is made to
means for actuating said spacer rods comprises
a mutilated signal having more or less than three‘ 25 a plurality of internally notched code rings and
marking elements, then the number of spacer
said stop-arm carries means for engagement
members 21 which will be positioned against the
with any alignment of notches in said code rings
narrow necks of the wedge members 23 will be
which may result from selective setting thereof.
more or less than three. In this case, the lug
5. In a device for detecting erroneous reception
IIa will be caused to intercept the stop arm I0, 30 of code signals, a set of internally notched code
regardless of whether the number of actuated
rings disposed in parallel planes, each ring being
code rings is less than three or more than three.
settable in response to the reception of a differ
If the number is other than 3, then the detent
ent element of a code signal, a set of wedge mem
lever I3a will not allow the stop arm ID to pass
bers individually pivotally mounted in such po
through the notch 36. The detent lever I3a 35 sition that their free ends are movable trans
may, however, occupy any one of four positions.
versely with respect to said parallel planes, each
The ?rst two positions in the order of its approach
of said wedge members being tapered inwardly
to the cover 3| will cause the leading side of the
from its free end, a set of spacers each settable
lug Ila to be interposed in the path of the stop
under control of a different one of said code
arm Ill. The third position is one in which the
rings and each having a ?ngermovable along
stop arm is free to rotate through the notch 36;
said tapered pro?les to determine the spacing
and the fourth position (where the detent Ill
therebetween, a typewheel shaft carrying an in
abuts the cover plate 3|) is such that the outer
dex arm having means thereon for searching out .
end of the lug Ila is caused to intercept the stop
a point of its arrest such as ‘is determined by an
arm I 0. Whenever the stop arm I0 is arrested
of notches in said rings, and a detent
by the lug I la, misselection is indicated.
constituting means for arresting said index arm
In the foregoing description, Figs. 3 and 5
in an error designating position, said detent be
have not been speci?cally referred to, but the
ing-operable under joint control of said wedge
parts shown in the other ?gures and in these
?gures have been given corresponding reference 50 members whenever the number of set code rings
is more or less than required for producing a code
numbers for more clearly indicating the con
notch alignment.
structional details of the misselection mechanism.
6. In a device of the class described the com
It will be apparent to those skilled in the art
bination of an internally notched code ring se-'
that various modi?cations of our invention may
lector for causing a rotatable shaft to be arrest
be made without departing from the spirit and
55 ed in dilferent selected positions, means includ
scope of the invention itself.
ing a stop-arm mounted on said shaft for caus
We claim:
ing its arrest, a plurality of independently piv
1. In an error detector which responds to the
oted wedge members having inwardly tapered
reception of mutilated code signals, a plurality
free ends, a plurality of spacer rods each having
of wedge members each separately pivoted at one
end and being tapered inwardly from their free 60 pivotal connection with a different one of the
code rings in said selector and each adapted to
ends, a plurality of spacer rods/each having a
portion slideable against the tapered edges of said
engage slideably along the tapered edges of said
nal reception.
homing position, the other for intercepting the
wedge members thereby to vary the expanse of
wedge members, means responsive to the recep
the same, and a detent adapted and arranged to
tion of different code elements of a-signal for
independently actuating said spacer rods where 65 intercept the shaft arresting means, said detent
being pivoted at one end and being movable in
by the disposition of the wedge members is vari
response to the variable expansion of the wedge
ably expanded and contracted, and means oper
member disposition.
able under joint control of said wedge members
'7. The combination according to claim 6 in
for producing an error-detecting response when
ever the number of actuated spacer rods is more 70 which said detent is provided with two lugs, one
for intercepting the shaft arresting means at a
or less than is required for unmutilated code sig
same in an error designating position.
2. A device according to claim 1 in combination
8. The combination according to claim 6 in
with a rotatable stop-arm mounted on a shaft to
be variably oriented in accordance with the re 75 which said detent is provided with a slotted lug
2540.4, 81.3
movable transversely with- ‘respect: to the. plane
of rotation of said shaft arresting-'meansg the
control of such movement being-'suehthat' apor
thereof, a plurality of spacer rods each individué
ally slideable along‘ the inclined edges“ of.‘ said
bars thereby to vary their expanse, eachof said
spacer rods being separately controlled. by‘ a re
tion of the lug-oneitherside off'said' slot will stop
the shaft in an error designating position;
5 spective one of said selector rings, a ‘pivoted: de
9. Ina device ofithe class- described, a» rotatable
tent setta-ble in accordance with the degree'of
shaft, a plurality‘ of selector rings for determine
expansion of said spatulate bars‘ caused by the
_ ing a. position of orientation at which said shaft
is. to.v be stopped, means including an exploring
arm mounted. on- said shaft: and cooperating with.
said selector. rings. for arresting the. rotationv of
said shaft, aiwedge-member’ assembly having‘. a.
plurality of spatulate bars pivoted: at; one end‘
actuated spacer rods, and an extension on said I
exploring‘ arm engageablewith said detent When
ever an- error in-code signal receptionv is to‘be des
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