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Патент USA US2410521

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Nov» 5,1946.
|_. M. PQTTS
~ 2,410,521 .
TAPE FEED ALARM
Filed May 22, 1942
-
' IiNVENTOR.
LOUIS M. POTTS ,
Patented Nov. 5, 1946
2,410,521
UNITED J STATES PATENT, j OFFICE ‘TAPE FEED ALARM
’
Louis M. Potts, Evanston, 111., assignor to Teletype
Corporation,v ‘Chicago, 111., a vcorporation of
Delaware
'
>
‘Application May 22, 1942, Serial No. 444,067
13 Claims." (oi. 177_311>
1
-
2
This invention relates to telegraph transmit
tingapparatus and particularly to a strip feed
alarm device for indicating the manifestation of
order that the operator may know in which par
ticular one of the. transmitters the condition’
defective strip feeding conditions.
exists.
The invention
,, . will be more readily
,
understood
.
V
by reference to the following detailed description
In the telegraph communication ?eld, tape is
employed as a medium for carrying indicia of
and the drawing wherein,
telegraph signal code combinations, usually in
the form of permutably arranged perforations.
Ordinarily, the tape is ?rst perforated either by
'
, '
Fig. 1 is a perspective view of oneembodiment
of the present invention partly‘ in section: and
with certain portions of the apparatus omitted
for the sake of clarity;
. _
_ j q
7
means of key operated perforator or by means of
Fig. 2 is a plan View of the embodiment of the
a signal controlled reperforator and later used in
invention disclosed in Fig. 1;
'
' ’
connection with a tape transmitter to send sig
Fig. 3 is a schematic representation of thecams
nals in code combination form overv an outgoing
line. The tape, in performing its operating func
used in connection with'the invention?disclo'sed‘
tions, is subject to stresses and strainswhich may 15
Fig. 4 is a plan view ‘partly in section of a- sec
at times cause the tearing of the feed holesand
possibly a complete rupture of the tape. 'Itvis
ond embodiment of the present invention; ‘ _
in.Figs.1and2;-
.
.,
,
'
.
Fig. 5 is a side view partly in section of the
apparent that any such undesirable conditions
may seriously impair transmission of messages
apparatus disclosed in Fig. 4;’ and
‘
Fig. 6 is a perspectivejview of the cam control
and cause distortion or loss of signals, particu 20
larly so if such conditions were not immediately
means employed in theembodiment of theinven
tion disclosed in Figs.3vand ‘l.
_
f ' g
recti?ed. The use of tape-operated transmitters
- Referring [now 'to vthe drawing, '' the first
which are ‘unattended by an operator is growing
embodiment of the invention which is disclosed
constantly and consequently the desirability of
the arrangement as herein provided is enhanced 25 in Figs. 1, ,2, and 3 will now be described'in
detail. The present invention-may be conven-l
inasmuch as the problem of defective tape feed
iently incorporated for use withtape transmit
ing conditions is obviously not as serious when a
ters such as disclosed‘ in, the patent to
transmitter is under the constant surveillance of
>Goetz', PatentNo. 2,296,845 issued September 29,
an operator.
It is therefore the prime object of this inven 30 1942, and in order to facilitate. the descriptionvof
the present application'it will‘be, presumed ‘that
tion to provide a mechanically controlled‘ strip
feed alarm which immediately brings to an oper
the ratchet wheel ‘56 disclosed therein¥ the'shaft,
58 which carries the ratchet 56, and the sprocket,
ator's attention the manifestation of adefective
tape feeding condition.
7
Other objects, features and advantages of the
35
present invention will become evident as the in
vention is further described in detail.
By the present invention there is provided a.
mechanically controlled alarm device in which
two contact operating. levers are normally main
tained in'inoperative positions by a cam arrange- ‘
ment and wherein a relative displacement of the
cams included in the arrangement when defective
tape feeding conditions occur, causes one or the
wheel 59 are the same as the similarly numbered
elements appearing in the present disclosure. As
described in detail in the just referred to patent,v
the tape is intermittently fed forward as :the
ratchet 56 is‘ periodically advanced by manger a
pawl iassociated with'a stepping‘i?agnet which
thereby causes'the rotation of the shaft'58faifdv
the tape feed sprocket 59. In, the present revels,
ti'on' there is attached to the shaft 58 by meansv
of a set screw 60 asleeve' 5| which ?xedly carries‘
a pair of cam members 62-and 63 which are thus
other of the levers to operate both an audible‘ 45
and a visible signaling means. The use of both
audible and visible signal indicating means in the
mounted for rotation with the shaft 58. '
present invention is particularly desirable in view
of the fact that the apparatus heren disclosed is
designed especially for usein installations which 50
sprocket 65 which is frely rot'atable'about ashaft
6% which is suitably mountedvinthe transmitting
apparatus.‘ The sprocket '65 is attached to the
may include a large number of transmitters.
sleeve 6'! and rotatable therewith‘ about the shaft
It
' '
> ‘
To the rear of the feed sprocket 59 directly in
alignment therewith is provided a second ‘feed,
is therefore necessary to bring to the operator’s
56. Carried at the end of the sleeve 61 opposite 1
attention not only an indication of the occur
the sprocket 165 is apair of cams 68 ‘and 69 which
are similar in con?guration to the cams 62 and‘
rence of a defective feeding condition by an audi
ble signal but also by a visible signal as well in 51.5 53 Whichvwere previously described. , _
2,410,521
3
4
Referring now again to the shaft 58 (Fig. 2)
as long as the tape H0 is being fed forwardly
by sprocket 59 and the sprocket 65 is being ro
tated through the intermittent pull of the tape
H0, the levers ‘l3 and 83 will be retained in a
clockwise position. This is due to the fact (re
ferring ?rst to lever 73) that cams 62 and 63 when
in phase relationship with camsl68 and 69 are
it can be seen that there is carried thereon for
rotation therewith a gear ‘H which drives an
idler gear 12 which in turn drives a gear 64 which
is ?xedly attached to the shaft 65. It is there
fore apparent at this point that as the sprocket
feed wheel 59 intermittently advances the tape
H0 forward, the pull of the tape enables the
second sprocket wheel 65 to be also intermittently
advanced inasmuch as the feed holes of the tape
are positioned on the pin projections of both
sprockets. It is therefore further observable that
inasmuch as sleeve 61 is attached to sprocket 65,
as sprocket 65 is advanced, the sleeve 6:! will also
be advanced and will carry the earns 68 and 69
so arranged that the high portions of the cams
work alternately against the upstanding arms 15
and 14.
Cams 63 and 69 are normally so posi
, tioned that when the end of arm 15 has been
traversed by a high portion of the cam 63 the
other arm 14’ will have already been engaged by
the" high portion of cam 69. Lever 94 is con
trolled in a similar manner by its associated cams
and-it is therefore apparent that as long as op
erating conditions are normal, neither one of the
levers 13 or 83 will be allowed to pivot and close
the contacts 9| to cause operation of an alarm
device to be hereafter described. Should a break
with it during its advancing operations. At the
same time it will be noted that the pair of cams
62 and 63 which are carried by the sleeve 6|
mounted on shaft 58 will likewise be intermittently
advanced so that a phase relationship will be
normally maintained betweenthe'two sets of
age of tape occur, shaft 58 will continue to rotate
cams.
with'rs'haft 58 and cam 69 associated with shaft
66 in a contact operating lever 13 which has an
and drive the cams 62 and 63 while the sprocket
65 will no longer rotate inasmuchas the tape no
longer exerts a pull thereon,'and therefore cams
68 and 69 come to a stop. At'this time either one
or the other of the arms 14 of lever 73 or the arm
84 of the lever 83 rests on a high portion of the
cam‘ while the other arm is positioned over a low
portion of the cam. Therefore, if for instance
' upstanding arm 14 adapted to cooperate with the
arm 74 of lever 13 were over a low portion of cam
It will be understood that the gear ar
rangement will be such that sprockets 59 and 65
will be intermittently rotated thesa’ine relative
distances during normal operation of the appa
rains-
c
,
,
,
“Mounted in alignment with cam 63 associated
cam 69 and a second upstanding arm 15 adapted
69 when shaft 66' came to a halt then when cam
to cooperate withthe cam 63. A horizontally ex
tending arm 16 of the lever 13 is in engagement
with an insulating portion 11 of a contact spring
18 which is normally ‘spring urged away from its
63 is in a position whereat the arm 15 may on
gage a recessed portion of its cam, the lever 13
would be able to pivot to a position under the
in?uence of spring 8| to close the contacts SI
and operate the alarm device. Of coursea simi
associated spring contact member 19‘ The lever
13_'is normally urged to rotate in a counterclock
lar condition would occur if the arm 84 of lever
83 came to a position overlying a recessed por
tion of cam 68 when the shaft 66 came to a stop.
wise direction about vpivot shaft 82' as viewed in
Fig: 1 under the'in?uenc'eofspring 8| so that the
upstanding ‘projection 15 and the upstanding -
projection 14 are urged into engagement with
The pair of earns‘ 68 and 69 are provided with
raised portions slightly less than 90 degrees and
with recessed portions slightly more than 90 de
their associated cams. Also mounted upon the
shaft 62 is a second lever 83 which is exactly the
samein construction’ as the just described lever
grees with the ‘high portions of‘ one cam adja
cent the low portions of the other cam. This
19.“ Upstanding portion 84_ of lever 83‘ is adapt
enables an overlapping cooperation of the high
ed-to cooperate with cam 68 while the upstand
portions of cams 68 and 69 with the high por
ing arm 85 of lever‘ 83 is adapted to cooperate
tions of cams 62 and 53, respectively, which, as
with the cam 62 and the horizontallyextending
already mentioned, are slightly in excess of 90,
degrees to normally hold levers 13' and 83 in
arm» 86Vis: adapted to cooperate with the insulat
inglport'ion _'l_'l of contact spring ‘I8 in a similar 50 their respective inoperative positions when oper
manner to the horizontally extending arm 16 of
at'ing in proper phase relationship. Due to the
leverr‘ir3 and likewise _a spring 81 normally urges
fact that cams 68 and 69 are staggered with
respect to each other, that is, with the slightly
lever-v83’ in awcounterclockwisedirection as viewed
in Fig. -1. The contact spring_'!8- is therefore
under 90 degree high portions of one cam adja
common to and operable by either lever 13 or , cent the slightly more than 90 degree low portions
of the other cam, it is always assured that the
I 'iIgfheraisedportions qf-cams 62 and 63 will be
cam engaging portion of one ofthe levers ‘I3,
slightlyin excess of 90 “degrees of their respective
83 will overliea low portion of one of the cams
peripheralcontours (Fig. 3) while the recessed
68,769 when they cease to rotate as explained,
portions of the cams will be slightly less than
90 degrees of their respective peripheral con
tours andqtheicams? and 63'will be so positioned
with relation to each otherthat the high portions
60
andis thus enabled to pivot-and operate the
alarm device ‘irrespective of the stop positions of
cams 68 and 69.
The closing of the contact pair 9! completes
of one cam will be opposite the low portion of the
thealarm circuit over conductors 92 and 93 so
other cam- as shown in Fig. 1,‘for apurpose which
that an audible signal 94 and the visible signal
95 are placed into operation and will be periodi
will hereafter appear. The high portions of cams
69 and 69Bwill~ consist of segments of slightly
cally operated thereafter as the shaft 58 con
lessthan 90 degrees of- the peripheral contour
tinues to rotate to cause a periodic movement
or the particular lever whose upstanding arm,
of the cams-While the recessed portions of these
cams will be slightly in excess (Bf-'90 degrees of 70 ‘M4 or ‘812' was opposite a low portion of the cam
theperipheral contour of the camsand the raised
when, the shaft 66 came to a stop. The attend
portions of cam vI58 will be positioned adjacent
ant» at this time will thus be informed that a
the recessed portions of cam 59 as clearly shown
defective tape feeding condition has occurred and
'inFig. 1.
It can now be seen by referring to Fig. 1 that
will ‘then immediately be able to rectify the 'con
diiion,
2,410,521;
5
In order to reset the cams 68 and 69 into phase‘
relationship‘ with the cams 62 and 63, a special
reset mechanism is provided which will nowbe
described.
In tape transmitters such as dis
closed in the Goetz-patent, already referred to;
there is provided a bar I08 which is similar to
the bar I08 disclosed in Figs. 1 and 2 and which
is employed at the start of transmission tocon
dition the apparatus for operation. Adjacent to
the bar I08‘ is suitably mounted a bracket I09
which carries a U-shaped lever III which is
pivoted at H2 and carries an extending'arm
H3. Lever III is normally urged in a counter
clockwise direction by spring I20 asv viewed in
Fig. 2., The upper and lower arms H8 of the
U-shaped member terminate in a rounded por
now be described.
This second‘ embodiment‘of
the invention may also be readily incorporated ‘
into the previously referred to transmitter dis
closed in the Goetz patent. It will be presumed
that ratchet wheel I56 is equivalent to the ratchet
wheel 56 shown in Figs. '1 and 2 and likewise
the shaft I58 and feed sprocket I59 are equivalent
to shaft 58 and the feed sprocket 59, respectively,
as disclosed also in Fig. 1. It had been previously
mentioned that the parts 56, 58, and 59 of Figs.
1 and 2 were numbered similarly to the like parts
appearing’ in ‘the Goetz patent. Shaft I58 will
be suitably journaled in the frame_and will be
intermittently advanced by the engagement of
a stepping pawl with the ratchet I56 as is well
known in the art. The tape I6! will be threaded
over the teeth of the feed sprocket I59 and will
tion I I5 which rides in a groove of a collar mem
he therefore intermittently advanced as the
ber H6 which is suitably keyed to a slot H1 in
ratchet I56 is actuated. Carried at the end of the
shaft 66 and rotatable therewith. The collar,
member I I6 includes a pair of disc like side mem 20 shaft I58 opposite to the ratchet I56 is a gear
I62 which drives a suitably mounted idler. gear
bers I2I and I22. The disc member I22 has
I63 which in turn causes the rotation of a driving
struck up therefrom an upstanding projection
gear I64. ‘ In mesh with the driving gear I64 is a
I23 adapted to cooperate with two pins I24 and
second idler gear I65 which drives the gear I66.
I25 carried by sprocket 65 in a manner to be
immediately hereafter described.
25 Integrally formed with the gear member I64 is
a sleeve I61 which carries a cam member I66
The ,U-shaped member III which is mounted
having a peripheral contour in which the raised
upon bracket I69 is during normal transmission
portion of the cam is slightly in excess of 180
restrained from movement by the abutment of
degrees. The sleeve I61 is attached to the shaft
projection H3 with an extending portion H4 of
the bar I06. However, when it is desired to start 30 I69 by means of a set screw HI and it is thus
obvious that the shaft I69'is rotatable with the
transmission or to reset the tape sprockets into
gear I64.
phased relationship, the bar I08 is depressed and
Also mounted upon the shaft I69 and freely
the projecting portion H4 of the bar is removed
rotatable thereon is a second feeding sprocket
from the path of the projection H3 so that the
U-shaped member III is then free to move in a 35 I12 which is directly in alignment with the ?rst
feeding sprocket I59. It is therefore observable
counterclockwise direction as viewed in Fig. 2.
that as the tape I 6| is advanced by the ?rst feed
under the influence of spring I20. This causes
ing sprocket. I59 inasmuch as the tape by means
the upper and lower arms H8 of the U-shaped'
of its feed holes engages the teeth of the'second
member III to shift the collar member II 6 axi
feeding sprocket I12, the second feeding sprocket
ally upon the shaft 66 along the keyway II1 to
I12 will be rotated about'the shaft I69 by the pull
its phasing position.
‘
of the tape. The feed sprocket I12 has integrally
When inserting a new or an unused portion of
formed therewith a sleeve I13 which surrounds‘
a broken tape, the operator depresses the bar
the shaft I69 and carries a cam member I14 which
I08 with one hand and with theother hand posi.tions the tape upon the sprocket 65 and there-, . has a peripheral contour in which the raised
portion of the cam is slightly less than 180 degrees
after with the same hand rotates the sprocket
for a purpose which will hereinafter appear.
65 manually until sufficient tape has been fed
When the tape is' properly advanced by the
out for engagement with the main feeding sprock
feeding
mehanism, the cams I14 and I68 will be
et 59. The sprockets 65 and 59 will be so placed
with respect to each other that by the time. 50 so arranged that their high portions together
present a 360 degree closed surface to the cam
the tape has been positioned .upon the. front
engaging portions I16 of a pair of levers I11 and
sprocket one or the other of the pins’ I24 ‘of.
I18 which are pivoted at I19 and I 8 I, respectively,
I25 will have come into engagement with the
and the came engaging portions I16 of which
upstanding projection I23 of disc member I122
of collar member H6 which is carried by the 55 are 180 degrees apart and normally urged towards
each other by means of resilient spring members
shaft 66 and therefore the sprocket will again
I 80 associated with contacts I83 and I64. The
be returned to a phase relationship. This oc
lower end portions of the levers» I11 and I19
curs when the collar member II6 assumes‘ its
terminate in curved contact engaging portions
phasing position as described above. Due to the
fact that the collar H6 is rotatable with the 60 H9. These contact engaging portions >II9 are
adaptablelton cooperate with contact members
shaft 66, as the sprocket 65 is rotated manually
I83 and I84 which control the alarm circuit.
by the operator, a point will ‘be reached as ‘exe.v
Normallyithe contact engaging portions II9 of
plained wherein the pins I25 or' I24 will engagev
the levers rest against the insulating‘ members
with the projection I23 so that the sprocket 65
and the collar I I6 will thereafter rotate as a unit 65 I85 associated with the resilient spring members
I80 of the contacts and hold the spring members
and thereby the gear members 64, 1 I, and 12 will‘
in ?exed condition to thus urge the levers I11
be likewise rotated to therefore set in motion
and I18 to pivot towards each other. However, ‘
the sprocket 59. It can thus be seen that by
should a defective or irregular tape feeding con
means of this mechanism the sprockets may be
readily returned to their exact phase relationship 70 dition occur one or the other of the levers will
which they will continue to maintain until the
tape again breaks or for some other reason fails
to advance the tape.
.
- -
Referring now to Figs. 4, 5, and 6, the second
embodiment of the invention herein disclosed will
be‘ pivoted under the influence of the spring con
tact members I89 as will laterv appear and will
close one or the other of the contact members
I83, I84;v The 'closure'of either of the contacts‘
enables‘ one ofthe parallel circuits I80 and I81
2,410,521‘
7
to become effective to operate an audible alarm‘
device I88 ‘and the other to operate a signalllamp
I89 which will announce to the operator the oc
currence of a defective tape feeding condition. '
The operation of'the contact control levers I'll
and I‘I8'will now be described in more detail. it
will be presumed that the tape stepping sprocket
I59 is in normal operation and is intermittently
advancing the tape I6 I. If a breakage of thetape
should now occur, the main tape feed sprocket I59 10
8
holes would not be centralized with respect to
the teeth of the sprocket but would be pulled to
one side by the teeth of 'the’sprocket. This would
cause a slight misalignment of the signal per
forations with the tape feelers and might impair
the e?iciency of signal transmission.
It will be understood that various changes and
modi?cations may be made in the above-described
speci?cation without departing from the spirit
and scope thereof. ,
will continue to operate. However, due to the fact
that the second tape feed sprocket'l ‘I2 is operated
What is claimed is:
1. In a tape feed alarm, feeding means for
by the pull of the tape it will come to rest. There
advancing a strip, a cam mechanism, means for
fore, inasmuch as the cam I14 is carried by the
operating said cam mechanism under the joint
sleeve I73 which is connected to the feed sprocket 15 control of said strip and said feeding means, an
I12, this cam will likewise come to rest. 0n the
alarm device, a pair of levers controlled by said
other, hand, the cam I68 will continue to rotate
cam mechanism for operating said alarm de
by means of the drive aifo‘rded by the'gear's I62,
vice, and‘means included in said cam mechanism
I63, and I64. In view of the fact that the high
for enabling the operation of one of said levers
portion of the cam H4 is slightly less than180
upon the failure of said strip to exercise control
degrees and the cam engaging portions‘IlS of
of said cam mechanism to thereby enable actu
the levers IT! and I78 are 1801degrees apart, one
ation of said alarm device which of said levers
of the levers will be held in its outer position‘by
being actuatable depending on the phase posi
engagement with the ‘high portion of cam I'M.
tioning of said cam mechanism.
When the cam comes to rest, While the other leverv
2. In a strip feed alarm, feeding means for
will be opposite the low portion of the cam and
advancing a strip, a ?rst pair of movable cam
when the cam‘ I68 is in a position to also present
members, means for moving said ?rst pair of
its low portion to this last mentioned lever, the
cam members in synchronism with the movement
lever will be permitted to carry its‘cam‘ engaging
of the strip feeding means, a second pair of
portion H6 inwardly under, the in?uence of its 30 movable cam members, means for moving said
associated spring contact member 586, enabling
second pair of cam members in synchronism with
its contact engaging portion H9 to operate‘ its
the movement of said strip to maintain a phase
associated contact member I83. The alarm
relationship with said ?rst pair of cam members,
device will then thereafter be intermittently
and an alarm device controlled by said pairs of
operated" as the cam I68 continues to rotate and 35 cam members, whereby said alarm device is op
present its low portion to the lever whose cam
erated by said pairs of cam members when said
engaging portion I76 happens to' be opposite the
low. portion of the cam I16. This condition will
continue until the operator has made the neces
sary‘corrections in the apparatus.
7
‘
'It'will be understood that a similar resetting
mechanism which was described in connection
with Figs. 1 and 2 could be readily incorporated‘
into the embodiment of the invention disclosed
‘ in Figs. 4, 5, and 6 by mounting a collar member
such as II6 disclosed in Fig. 2 upon the shaft
strip fails to maintain said phase relationship
'between said pairs of cam members.
3.1In ‘a strip feed alarm, feeding means for
advancing a strip, a ?rst pair of movable cams,
means for moving said ?rst pair of cams in syn
chronism with the movement of the strip feeding
means, a second pair of movable cams, means for
moving said second pair of cams in phase with
said‘?rst pair of cams andv in synchronism with
the'movement of said strip, a pair of levers each
I69 and providing the other necessary equipment
controlled by a cam of each pair of cams, and
which has already been described.
.
an‘ alarm device operable by either of said levers,
The purpose of providing the additional’ idler
whereby one or the other of said levers is actu
gtar I65 and the additional driven gear' I66 in 50 atable to operate said alarm device when said
mesh therewith is to enable the rotation of a suit
pairs of cams are not maintained in phase by said
ably journaled shaft 192' which carries a third
strip; which of said levers being actuatable de
feeding sprocket I93. As shown in the drawing,
pending on the phase positioning of said earns.
the third‘feeding sprocket'l63 is in direct align?
'41 In -'a strip feed alarm, feeding means for
ment with the feeding sprockets I59 and I12 but‘
advancing a strip, a ?rst pair of movable cams,
is in a slightly elevated position with respect
a second pair of movable cams, said ?rst pair of
thereto. The purpose of this arrangement is tov
cams moving in synchronism with the movement
enable a considerable portion of the tape to move
of the strip feedingmeans and said second pair
over' the periphery of the feed sprocket R93 to
ofscamsmoving in phase with said ?rst pair of
thereby enable a better distribution of strain upon 60. cams and in synchronism' with the movement ofv
the‘tape. A strain relieving sprocket is partic
said strip, an alarm device, and a pair of levers
ularly desirable in cases where the tape may be
to control said alarm device, each of said levers
fed from arelatively large supply reel and in cases?
being alternately controlled‘by a single cam of
wherein it makes for better operation of the tape
each pair of cams, whereby one or the other of
transmitter to remove the strain from'the tape
said levers is actuatable to operate said alarm de
prior to the movement of the tape into the trans
vice. upon the failure ofisaid strip to maintain
mitter proper where it performs its transmit
said phase'condition of said cams, which of said
ting operations. One particular advantage of
levers "being actuatable depending on the phase
this is that it enables the centralization of the
positioning of said cams.
' >
feed holes of the tape upon the teeth~=of the 70' .5. In a strip feed alarm, feeding means for
sprocket wheel thus assuring the correct align-'
advancing a strip, a ?rst movable cam, means
ment of the signal-perforations "of the tape'with ,
for moving said ?rst cam in synchronism with
the sensing mechanism commonly’ employed in,
the movement of the strip feeding means, a raised
tape transmitters. If a strain were placed. upon
portion on said cm, a second movable cam,
the tape at the main feeding sprocket, the feed. 1 means for‘ movingsa‘id second‘ cam in phase with.
'
2,410,521
10
the ?rst cam and in synchronism with the move
ment of said strip, a raised portion on said sec
ond cam, an alarm device, and a pair of levers
depending on the phase positioning of said cam
means.
10. In a tape feed alarm, feed means for ad
vancing a tape, a ?rst movable cam means,
means for moving said ?rst cam means in syn
each having a portion engaging with said cams,
whereby said raised portions of said cams are nor
mally positioned with respect to each other to
chronism with the movement of said tape feed
present a closed peripheral surface to said cam
- means, a second movable cam means, means for
engaging portions of said levers while said phase
condition is maintained to normally prevent op
eration of said levers, whereby one or the other
of said levers is operative to control said alarm
device upon the failure of said strip to maintain
moving said second cam means in synchronism
with the movement of said tape and in phase
10 with the operation of said ?rst cam means, each
said ?rst and second cam means provided with
complementally related peripheral contours, lever
said closed peripheral surface of said cams under
means in contact with both said cam means, and
an alarm means controlled by said lever means
said phase conditions, which of said levers being
actuatable depending on the phase positioning of
which is ineffective when the complemental pe
said cams.
ripheries of said cam means are in phase and
6. In a tape feed alarm, feeding means for
advancing a tape, a shaft for driving said feed
ing means, a cam member carried by said shaft,
said cam means are out of phase.
effective when the complemental peripheries of
11. In a tape feed alarm, feed means for ad
vancing a tape, a ?rst movable cam means,
means for moving said ?rst cam means in syn_
chronism with the movement of said tape feed
means, a second movable cam means, means for
moving said second cam means in synchronism
a second shaft, a second cam member carried by
said second shaft moving in sync'hronism with
said tape to maintain a phase relationship with
said ?rst cam member, and an alarm device con
trolled by said cam members, whereby said alarm
device is operable under the control of said cam
with the movement of said tape and in phase
members upon the failure of the maintenance of
with the operation of said ?rst cam means, each
said phase relationship between said cam mem'
said ?rst and second cam means comprising a
bers.
pair of cams, corresponding ones of which are
7. In a strip feed alarm, feeding means for
provided with complementally related peripheral
advancing a strip,. a shaft, a pair of movable 30 contours, and an alarm means ineffective when
cams carried by said shaft and operated by said
the complemental peripheries of said correspond
feeding means, a second shaft, a second pair of
ing cams are in phase and effective when the
movable cams carried by said second shaft and
complemental peripheries of said corresponding
moved in phase ‘with said ?rst pair of cams in
cams are out of phase.
,
synchronism with the movement of said strip, a 1
12. In a tape feed alarm, feed means for ad
pair of levers each controlled by a cam of each
vancing a tape, a ?rst movable cam means,
pair of cams, and an alarm device operable by
means for moving said ?rst cam means in syn
either of said levers, whereby one or the other of
chronism with the movement of said tape feed
said levers is actuatable to operate said alarm de
means, a second movable cam means, means for
vice when said pairs of cams are not maintained
moving said second cam means in synchronism,
in phase by said strip, which of said levers being
actuatable depending on the phase position of
said cams.
8. In a tape feed alarm, feeding means for
advancing a tape, ?rst movable cam means, .
means for moving said ?rst cam means in syn
chronism with the movement of said tape feed
with the movement of said tape and in phase
with the operation of said ?rst cam means, each
said ?rst and second cam means provided with
complementally related peripheral contours, a
pair of levers each jointly controlled by said
?rst and second cam means, and an alarm means
operable by either of said levers, whereby one
ing means, a second movable cam means, means
or the other of said levers is actuatable to oper
for moving said second cam means in synchro—
ate said alarm means when the complemental
nism with the movement of said tape to main 50 peripheries of said cam means are out of phase,
tain a predetermined relationship with said
which of said levers being actuatable depending
?rst cam means, an alarm device including elec
on the phase positioning of said cam means.
trical contact means, and a pair of levers each
13. In a tape feed alarm, feed means for ad
engaging both of said cam means whereby when
vancing a tape, a ?rst movable cam means,
said phase relationship fails between said ?rst 55 means for moving said ?rst cam means in syn
and second cam means one of said levers closes
chronism with the movement of said tape feed
said electrical contact means to cause said alarm
means, a second movable cam means, means for
device to operate, which of’ said levers being ac
moving said second cam means in synchronism
tuatable depending on the phase positioning of
said cam means.
9. In a tape feed alarm, feeding means for
advancing a tape, a ?rst movable cam means,
means for moving said ?rst cam means in syn
chronism with the movement of said feeding
with the movement of said tape and in phase
60 with the operation of said ?rst cam means, each
said ?rst and second cam means comprising a
pair of cams, corresponding ones of which are
provided with complementally related peripheral
means, a second movable cam means, means for 65 contours, a pair of levers each jointly controlled
moving said second cam means in synchronism
by one of said pair of cams of each of said ?rst
with the movement of said tape to maintain
a predetermined phase relationship with said
and second cam means, and an alarm means
operable by either of said levers, whereby one or
the other of said levers is actuatable to operate
?rst cam means, an alarm device including elec
trical contact means, and a pair of levers jointly 70 said alarm means when the complemental pe
ripheries of said corresponding cams are out of
controlled by both of said cam means, whereby
phase, which of said levers being actuatable de
when said phase relationship fails between said
pending on the phase positioning of said cam
cam means one of said levers closes said elec
trical contact means to cause said alarm device
means.
to operate, which of said levers being actuable 75
LOUIS M. POTTS.
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