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Патент USA US2127593

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Aug- 23, 1933-
Filéd June 16, 1953
Q Sheets-Sheet 1
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Aug. 23, 1938.
Filed June 16, 1933
Aug. 23, 1938.
Filed June 16, 1933
3 Sheets-Sheet 5
‘ Heme/cu l2" MAX GRAMA NN
Patented Aug. 23, 1938
Heinrich F. Max Gramann, Orange, N.'J., as
signor to Thomas A. Edison, Incorporated,
West Orange, N. .L, a corporation of New
Application June 16, 1933, Serial No. 676,037
2 Claims. (Cl. 274-—21)
This invention relates to phonographs and more
particularly to phonographs of the business or
commercial type, which are adapted to record as
well as to reproduce dictation. This invention is
5 especially directed to a novel and improved con
struction for back-spacing the arm or carriage
which carries the recording and reproducing
mechanism so as to cause repetition of any por
tion of the record whenever the operator of the
10 machine so desires.
Phonographs designed for both recording and
reproducing dictation are now generally so con
structed and arranged that the carriage for the
recording and reproducing mechanism may at
Another object of the invention is to provide in
‘a recording and reproducing phonograph, an im
proved mechanism for back-spacing which will
simultaneously disengage the recording stylus
from the recordtablet and bring the reproducing 5
stylus into engagement with said record tablet.
A further object of the present invention is to
provide a novel means for automatically re-con
ditioning the machine for recording after the re
production of the matter recorded within the 10 v
back-spaced area has been effected.
A still further object of this invention is to pro
vide a mechanism for the purposes stated above,
which can be controlled from a point remote from
15 any time be manually moved or spaced back with
the phonograph proper.
respect to the record tablet, so .as to reproduce
previously recorded matter on said tablet. When
a dictator, using such a phonograph for recording
dictation, desires to reproduce previously dictated
2° matter, it is necessary-?rst, to manually read
just the recording and reproducing mechanism to
neutral position; second, to move the carriage
backwardly along the record tablet a distance de
Further objects and features of my invention
will be disclosed in the following speci?cation and
pending upon the amount of matter to be repro
25 duced; and third, to set the recording and repro
ducing mechanism in reproducing position. The
apparatus is then in condition for reproducing
and the dictator may listen to the recorded mat
ter. When the reproduction of such matter has
30 been completed and it is desired to dictate further,
it is necessary for the dictator to again manipu
late the recording and reproducing mechanism to
return it to the recording position. Such manipu
lations incident to a repeating operation in the
35 normal use of dictating machines are distracting
in addition to requiring considerable of the dic
tator’s time. Dictators may often neglect to' re
condition the recording and reproducing mecha
nism for recording after completing reproduction
40 and in consequence they proceed to dictate while
the reproducing stylus remains in engagement
with the record tablet with the result that no re
cording is obtained. Warning signals have been
provided to warn the dictator under these cir
cumstances, but such signals are frequently in
effective because of the concentration of the dic
tator on the subject of the dictation.
The primary object of this invention is to pro
vide a novel and eifective back-spacing con
to struction or mechanism, easily adaptable to the
above described type of phonograph or dictating
machine, and by which the back-spacing of the
recorder-reproducer may be easily and quickly ef
fected with'out distractive manipulation on the
part of the dictator.
appended claims.
For a clearer understanding of my invention,
attention is directed to the drawings, accompany- 2o
ing and forming part of this speci?cation, where
Figure 1 is a front elevation of a phonograph
‘having a preferred embodiment of my invention
applied thereto;
Fig. 2 is a top plan view partly broken away, of
the phonograph of Fig. 1;
Fig. 3 is an enlarged side elevational view, part
ly in section of the carriage and associated parts ,
of the phonograph of Fig. 1, the recording and 30
reproducing mechanism being positioned for re
Fig. 3A is a further enlarged plan view, partly
in section, of the mechanism at the rear right
comer of the carriage as seen from above;
Fig. 4 is a view of the mechanism of Fig. 3 as
seen from below;
Fig. 5 is a fragmental view of the mechanism
carried by the carriage in the position occupied
immediately after a back-spacing movement has 40
been effected;
Fig. 6 is a sectional view taken substantially on
the line 6-6 of Fig. 5;
Fig. 7 is a rear elevational view, partly in sec
tion, of the carriage shown in Fig. 3;
Fig. 8 is a fragmental view of the rear portion
of the carriage taken from the left-hand side as
seen in Fig. 1;
Fig.9 is a cross sectional view showing in de
tail the feed wheel of the phonograph of Fig. 1 and 50
its support;
Fig. 10 is an elevational view, partly in section,
showing the mouthpiece of the dictating machine
including the means for remotely controlling the
pperation of my improved back-spacing mecha- 55
nism; the electrical circuit employed to .control
said mechanism being shown schematically;
Fig. 11 is a plan view of the mouthpiece of Fig.
10 as seen from above;
Fig. 12 is a section taken on line |2—|2 of Fig.
11; and
Fig. 13 isan elevation, partly in section and
with parts omitted, of the rear portion of the car
riage and associated mechanism.
The phonograph is of well known construction
and comprises a base 4 having upright standards
3, 1 and 1'. A mandrel | for supporting a record
tablet A is carried by a shaft 2 joumaled in the
standard 3. The mandrel shaft 2 is connected
15 through a suitable clutch 9, I0 to a drive pulley
5 which in turn is connected by a belt 8 to a driv
ing motor (not shown). A feed screw 20, driven
from the mandrel shaft by gears 22, 23 is provided
for moving a carriage |3 transversely of the rec
20 ord tablet A. A pair of guide rods I1, l8 supported
by the standards 1, 1' are provided for slidably -
supporting the carriage I3. Guide rods I1 and I8
are supported in the standards 1 and 1' so that
they are freely rotatable,- but are restrained
advance of the recording stylus 56 and in conse
quence, when the mandrel is rotated to cause the
recording stylus to cut a phonographic groove in
the surface of the record tablet, the advance ball
rides on the uncut portion of the record tablet in
advance of said stylus. If sound waves impinge
upon the diaphragm 4|, the depth of the engrav
ing will be varied in accordance therewith and a
phonographic record will be made.
When the control arm 65 is shifted to the neu
tral position both the lifting dogs 1| and 12 are
rotated in a clockwise direction and coact with
their respective tabs 48’ and 42' to lift both the
?oating weight 48 and casing 42 and also the
styli 56 and 59 entirely clear of the record.
When the control arm 65 is moved to its rear or
reproducing position, the lifting dog 12 remains
in its upper position thus holding the casing 42
against the frame 32 as in the neutral position.
The lifting dog 1| however is then again rotated 20
downwardly or in a counterclockwise direction
and thereby allows the ?oating weight to move
downwardly away from the casing 42. Under
these circumstances the rear end of the repro
against longitudinal movement.
ducer stylus arm 58 is held within the stirrup 55 25
The carriage l3 supports a sound box l4 and
control mechanism for shifting the sound box into
and as a result the reproducing stylus arm 58 is
rotated in a counterclockwise direction so that the
recording, reproducing or neutral ‘position by ‘ reproducing stylus 59 will engage the record
grooves. When such contact occurs, the advance
actuation of a control lever 65. The sound box
ball is out of contact with the record surface and 30
30 and control mechanism therefor are of well known
the mass of the ?oating weight serves to bias the
construction and are substantially the same as
those described in detail in U. S. Patent to N. H.
reproducer stylus into its record engaging posi
Holland, No. 1,420,316, entitled Phonographs and
tion.‘ As the mandrel is rotated the stylus is
vibrated by the record groove and this vibration
is transmitted by the arm 58 to the stirrup 55 and 35
issued June 20, 1922. > The sound box comprises a
35 frame 32 having a downwardly extending lug 39
to which is pivotally secured a casing 42 having a
sound chamber and a diaphragm 4|. The frame
32 comprises a neck 33 for attachment of an elbow
34 forming the end of a ?exible speaking tube 35.
Connection is made between neck 33 and the eas
ing 42 by means of a sliding tube 45. The casing
42 is provided with a tab 42’ for coaction with the
control mechanism. A stirrup 55 is secured to the
diaphragm 4| and carries a recording stylus 56.
45 A ?oating weight 48 positioned below the casing
42 is likewise pivotally secured to the lug 39. The
?oating weight 48 is provided with a central hole
4|’ through which the recording stylus 56 and the
stirrup 55 may pass. An advance ball 80, which
50 may be made of sapphire and which has a spheri
cal surface preferably of a radius large in com
parison with the radius of the recording and re
producing styli, is provided on the ?oating weight
for coaction with the record under certain condi
The ?oating weight also carries a repro
ducing stylus arm 58 pivotally secured at 60 and
carrying a reproducing stylus 59. The end of the
stylus arm 58 opposite to that carrying the stylus,
lies at all times within the stirrup 55. The ?oat
60 ing weight 48 is also provided with a tab 48’ for
coaction with the control mechanism.
The‘ control mechanism comprises a pair of lift
55 tions.
ing dogs 1| and 12 arranged for rotary movement
around the guide rod i1. When the control lever
65 is shifted to the forward or recording position
(Fig. 3) both of the lifting dogs.1| and 12 are
moved in a counterclockwise direction until they
are entirely clear of the tabs 48' and 42' with
which they respectively coact. Under these con
ditions the ?oating weight 48 will move down
wardly until the advance ball 80 contacts the
record surface and the casing 42 will likewise move
downwardly until the recording stylus 56 is also
in contact with the record surface. The advance
75 ball 80 contacts the record surface somewhat in
consequently to the diaphragm 4|, thereby pro
ducing sounds corresponding to the engraving on
the record. The mechanism whereby the pre
scribed motions of the lifting dogs 1| and 12 are
attained is described in the above mentioned Hol 40
land patent and is not therefore described herein.
The recording and reproducing mechanism is
shown in reproducing position in Fig. 5.
The feeding and back-spacing mechanism, with
the exception of the feed screw 20, is mounted on 45
the rear portion of the carriage |3. The con
struction of the back-spacing and feeding mecha
nism is identical with that described in my co
pending application Serial No. 375,367, ?led July
2, 1929. The carriage l3 at its rear end is in the
form of a hollow channel having side walls 90 and
9| and a boss 93. A tube 94 having an internal
diameter of the proper size to receive the rear
guide rod I8 is ?tted into suitable holes in the boss
93 and inlthe side wall 9| and is secured against movement therein. The tube 94 extends entirely
across the space intervening the side walls of the
carriage l3 and forms a pivotal mounting for a
U-shaped member comprising a rear portion 96
and two side arms “4 and H5. The lower por 60
tion of the member 96 is bent inwardly (see Fig. 8)
to form a mounting bracket 96'. Mounting
bracket 96' is drilled to receive a threaded portion
of a shouldered stud 91 which is secured to the
bracket by a nut I04. A tubular member 98 com 65
prising a Worm gear 99 and having a gear wheel
2| ?xed thereto, is rotatably mounted on the stud
91 and is held against longitudinal movement
thereon by a screw’ ||l| (see Fig. 9). The gear
wheel 2| is arranged for engagement with the 70
feed screw 20 and acts under certain conditions as
a feed nut. A leaf spring “1 adjustably secured
to the side-wall 9| of the carriage coacts with a
pin “6 secured in the side arms “4 and I15 to
bias the gear wheel 2| into engagement with the 75
plunger-8| forward and causes the gear wheel 2|
feed'screw 20. The worm gear 89 meshes with a
worm I00 rotatably mounted on the tube 84. By ) to~ engage the feed screw 20.
In order to make the operation of this mecha
reason of the frictional resistance in the worm
and gear connection, the gear wheel 2| is locked nism automatic it is essential that when a back
spacing operation is performed the recorder and
Cl against movement and thereby serves in the same
fashion as the more uspal form of feed nut when' reproducer mechanism be simultaneously thrown
the carriage is being fed across the record by the ‘into reproducing condition. In order to accom
plish this an auxiliary lifting dog I 36 having a
feed screw. A ratchet wheel III is secured con
centrically to the worm I00. Adjacent the projecting nose I 31 is pivotally mounted adjacent
the lifting clog ‘I2 in such a way that the project 10
10 ratchet wheel I II a cam‘ I05 is mounted for rota
tion on the tube 94. A pawl‘ I08 is‘ pivotally ing nose may also coact with the tab 42' on the
mounted on the cam I05 and is biased into en
gagement with the ratchet wheel I I I by means of
a coil spring H0.
The cam I05 carries an in
wardly extending pin I06 which passes through a
short circumferential opening I0'I in the tube 94
and into a longitudinal slot I06’ in the rear guide
rod I8. Adjacent the standard ‘I’ (see Figs. 1 and
2) the back rod I8 is provided with an arm I24 to
20 the outer end of which a connecting lever I23 is
rotatably fastened. The opposite end of the con
necting lever I23 is secured to an armature I22
designed to coact with a magnet coil I2I. When
the magnet I2I is energized the armature I22 will
Ni (Fl be drawn upwardly opposite the core of the mag
net which will cause a rotary motion to be im
parted to the back rod I8. When such rotary
motion occurs, the cam I05 will be rotated because
of the engagement of pin I06 in slot I06’ and the
30 worm I00 will simultaneously be rotated by reason
of the engagement of the pawl I08 with the
ratchet wheel III. Such rotation of the worm
I00 will cause the worm gear 99 and the gear
wheel 2| to be rotated and a back-spacing motion
5.3 Cl of limited extent is thereby imparted to the car
riage, the feed screw then acting as a rack and
the gear wheel 2| as a pinion. When the magnet
coil I2I is de-energized, the armature I22 drops
down, thus restoring the cam I05 to its original
40 position. The pawl I08 slides back over the
ratchet III, leaving the worm in the position to
which it was moved during the back-spacing
operation. If a back-spacing motion of greater
extent is desired, the magnet coil I2I may be suc—
cessively energized and de-energized, thus im
parting a step by step back-spacing motion to the
carriage which may be continued to accomplish
any desired extent of backward movement.
The parts of the mechanism thus far described
are each separately old in the art.
It will be seen
that the mechanism provides manual control for
the positioning of the recording and reproducing
mechanism, as well as means whereby the car
casing 42 (see Figs. 3, 4 and 5). The lifting dog
I36 is freely rotatable and may be moved inde
pendently of the lifting dog 12. A pin I35 is
arranged for coaction with a suitable shoulder on 15
the lifting dog I36. The pin I35 is secured to a
disk I35’ concentric with the lifting dog I36 and
is similarly mounted for rotation within a boss I5
on the carriage I3. A coil spring I40 connected
between the disk I35’ and the outer wall of the 20
boss I5 serves to bias the disc and consequently
the pin I35 to a point where the nose I31 of the
lifting cam I36 is below and clear of the lifting
tab 42'. A‘connecting rod I3I is pivotally secured
to the pin I35 by a suitably drilled U-shaped 25
member '_I34. The connecting rod |3I passes to
the rear of the carriage and is supported in a
bearing formed in an L-shaped bracket I4I se
cured to the inner side of wall 90 of the carriage.
The rear end of the connecting rod I3I is ar 30
ranged for coaction with a top portion I30 of a
bail having side arms I28 and I29. The ball is
pivoted on one side by a pivot screw I25 passing
through the arm I28 and secured in the arm H4,
and on the other side by a short shouldered stud 35
I26 passing through the arm I28 and secured in
the arm II5. A screw I50 threaded in the stud
I26 holds the arm I29 in place. A coil spring I33
around the pivot screw I25 biases the bail toward
the rear of the carriage. The arm I28 of the bail 40
is provided with a roller I32 for coaction with the
nose of the cam I 05.
It will therefore be seen
that when the back-spacing mechanism is oper
ated and the cam I05 rotated, a forward motion
will be imparted to the bail which will in turn 45
strike the end of the connecting rod I3I and move
the auxiliary lifting dog I36 in a clockwise direc
tion thus lifting the casing 42 upwardly and con
ditioning the recorder-reproducer mechanism for
reproducing (see Fig. 5).
However as soon as the back-spacing mecha
nism returns to its normal position the recorder
reproducer mechanism would likewise tend to
return to the recording position. In order to
maintain the mechanism in reproducing position, 55
the connecting rod I3I is provided with a notch
I3I' for coaction with a latching pawl I42. The
pawl I42 is pivoted on the L-shaped bracket MI
riage may be back-spaced. In order to throw the
gear wheel 2| out of engagement with the feed
screw 20 when the control lever 65 is moved into
the neutral position wherein the carriage I3
should be freely movable along the guide rods, a
plunger 8| having a rounded head 84 is provided by a shoulder screw I43 and is biased into contact
60 for coaction with a roller 84’ (see Fig. 3). When _ with ‘the connecting rod I3I by a coil spring I44. 60
the lever 65 is moved to neutral position the roller As soon as the connecting rod I3I has been moved
84' pushes the plunger 8| backwardly. A push
rod 8|’ secured to the plunger 8| coacts with the
upper end of the rear portion 96 of the U-shaped
member which carries the feed wheel 2| and its
associated parts.‘ It will be seen that when the
plunger 8| moves backwardly under the in?uence
of the roller 84', the portion 96 and consequently
70 the feed wheel 2| will be rotated in a clockwise
direction around therear guide rod I8 and against
the tension of the spring I II, thus serving to dis
engage the gear wheel 2| from the feed nut 20.
When the control lever is in either the recording
or reproducing position the spring II'I moves the
forward during a back-spacing movement, the
latching pawl I42 falls into the notch I3I' and
retains the connecting rod I 3| in its forward posi
tion and thus maintains the sound box in its 65
reproducing position.
The ‘latching pawl I42 has‘ a lower extended
portion I45 which in normal operation abuts
against a pin I46 carried by a marker plate I41.
The marker plate M1 is supported on the back 70
rod I8 adjacent the carriage I3. It is provided
with an enlarged collar I48 carrying a pin I5|v
for engagement with the slot I06’ in the back
rod -I8 whereby it is maintained correctly posi
tioned. It is also provided with a suitable fric 75
tioning device comprising an adjustable spring
I49 and a plunger I49’ housed in a well in the
pawl I58 pivoted on a screw I59, is secured to the
mounting bracket 96'. When the control lever
collar I48. When the carriage is in the recording ' 65 is in recording position the pawl I58 is clear
position and is moving forward normally the of the marker plate I4'I (see Fig. 3) and the rela
marker plate is pushed along by the side wall 9| tive movement of the carriage and the' marker U!
plate is not restricted. However, as soon as the
of the carriage. By reason of the contact be
tween the pin I46 and the lower end I45 of the control lever 65 is thrown into neutral position
latching pawl, the marker plate maintains the
upper or latching end of the pawl I42 completely
10 out of contact with the rod I3I. However, when
a back-spacing motion is imparted to the car
riage the marker mechanism is not moved back
wardly with the carriage and as a result the
latching pawl is then free to fall into the notch
15 I3I’ and thereby to maintain ‘the recording and
reproducing mechanism in reproducing condi
When all of the recorded matter has been
reproduced, the lower end of the latching pawl
I42 will again engage the pin I46 and, upon
20 slightly further advance of the carriage, will
withdraw the latching pawl from the notch I3I’
and allow the connecting rod I3I to move back
wardly under the urging of the coil spring I40.
The casing 42 will thereupon be released and
25 will drop down until the recording stylus 56
again engages the record and conditions the
machine for recording.
In the mechanism just described it will be seen
that the recording and reproducing mechanism
30 is returned to recording condition at substantially
the same point along the record as that at which
the back-spacing motion was started.
Such an
arrangement might result at times in cutting out
a small portion of the groove already recorded or
35 might shift the recording and reproducing mech
moved in the recording position the pawl I58 is 15
again moved out of the way of the marker plate.
A spring IIiI serves to bias pawl I58 to the opera
tive position shown and also permits the pawl to
ride over the plate M1 in the event said pawl
should be positioned rearwardly thereof by rea 20
son of improper operation of the machine and the
carriage should then be advanced, with the arm
65 set in neutral, for the purpose of restoring said
pawl to its normal position in advance of plate
In the construction shown the feed wheel 2| is
held against rotation under normal operating
conditions by the frictional engagement of the
worm wheel 99 with the worm I00. However
under some circumstances there may be a certain
amount of back-lash or lost motion in the con
nection of the feed wheel to the carriage and this
is very undesirable during the recording opera
tion when it is essential to have the groove
engraved upon the record tablet very accurately. 35
reason it is preferable to allow a slight space
any such lost motion. Such a braking mecha
nism may comprise a pulley I90 mounted on the
sleeve 98 which carries the gear wheel 2|. A 40
brake band I99’ is secured at one end to a pin
I92 ?xed in bracket 96’ andencircles the brake
drum I90. The brake band I99’ is secured atits
45 face I53 is secured to the marker plate I41 by
a screw I50’. It will therefore be seen that
I41 as shown in Fig. 3A, so that if the carriage is
retracted it will serve to carry the marker plate
I4'I along. As soon as the control lever is again
For this reason it may be desirable to provide a
on which the arm I29 is pivoted is provided with
a camming surface I52 on its outward end. A
member having a complementary camming sur
screw are rotated about the guide rod I8 in a
clockwise direction as seen in Fig. 3, the pawl 10
I58 will be moved inwardly and over the plate
anism into recording position before the repro
duction had been entirely completed. For this
to intervene before the recording and reproduc~
4.0 ing mechanism is again conditioned for record
ing. In order to accomplish this, the stud I26
wherein the mounting bracket 96 and the feed
whenever a back-spacing movement is imparted
to the carriage, and the marker plate I41 is
rotated upwardly by reason of its pin and slot
connection with the back rod I8, the marker plate
will be cammed to a position slightly in advance
of the farthest point of advance of the carriage.
Under these conditions when the carriage again
moves up to the marker plate and the recording
and reproducing mechanism is again conditioned
for recording by coaction of the marker plate
with the pin I46, there will be a slight gap left
between the finish of the previous recording and
the start of the succeeding recording.
The .mechanism above described is available
for operation as described as long as the dicta
tion is continued, providing means for repeating
.and subsequently restoring the mechanism to
recording condition whenever desired. However
whenever a cylinder is removed from the man
drel and a new cylinder placed thereon it is
necessary to move the control lever 65 into the
neutral position and to move the entire carriage
backwardly toward the starting position. Under
70 these circumstances it is necessary to also retract
the marker plate I41 so that it will always be
available in connection with the operation of
repeating portions of the dictated matter. In
order to insure the return of the marker plate
I41 with the carriage, a bracket I69 carrying a
frictional braking mechanism which will prevent
other end to another pin I93 ?xed in a plate I94
rotatably mounted on the sleeve 98 adjacent the
brake drum I90. The plate I94 has a short ex
tending arm I95 adapted to cooperate with a
short arm I95 of a bell crank I9‘! (see Figs. 4, 7
and 8). Bell crank I9? is pivoted on a pin I98
carried by a bracket I99 secured to the mounting
bracket 96’. The long arm of the bell crank is
provided with a short ?nger 292 adapted to bear
against the peripheral surface 203 of the cam
I05. The shape of the cam is such that when
the mechanism is in normal operating condition
a considerable tension is maintained on the
spring band I99’ thus preventing any play or
lost motion of the gear wheel 2I. However as
soon as a back-spacing motion ,is initiated, the
cam I05 moves a slight distance and recedes from 60
?nger 202 to release the tension upon the spring
band I90’ so that the gear wheel 2I is free to roll
along the feed screw and thus cause the back
spacing movement described above.
The speaking tube comprising the ?exible tube
35 serves as a sound conduit and is terminated
in a mouthpiece 36. The mouthpiece preferably
of moulded insulating material, is provided with
a clutch controlling switch which comprises a
switch box I89 and a cover I83 therefor, the
cover being pivoted by a screw and bushing I84.
The switch cover is normally biased outwardly
and when in this position the clutch is disen
gaged. Upon pressing the switch cover I 83 down
wardly the clutch is engaged and the mandrel ro- 75
tated. The construction of the clutch and clutch
controlling mechanism is of itself no part of this
movements of the carriage as described herein
before. During this back-spacing operation, the
recording and reproducing mechanism will be
conditioned for reproducing and upon comple
invention and may be of the type described in
Patent No. 1,380,486, to S. G. Langley, dated
tion of the back-spacing motion he may cause 6
June 7, 1921, and entitled Controlling device.
In addition to the clutch controlling switch,‘ a - the mandrel to rotate by depressing the switch
second switch is provided within a casing I10 on cover I 83, whereupon the carriage will again move
the speaking tube for controlling the repeating forward and the matter dictated will be repro
duced. When the carriage has traveled a slight
mechanism described herein. This switch com
10 prises a ?nger-piece "I of insulating material distance past the end of the dictated matter, the 10
recording and reproducing mechanism will be
pivoted in the casing I10 by pins I12. Finger
piece I'll carries a metallic connecting arm I11 automatically restored to the recording condition
adapted, when the ?nger-piece IN is rocked in and he may proceed with his dictation. The ex
either direction to make contact and establish tent of the back-spacing motion depends upon
the number of oscillations given to the ?nger 15
15 a circuit between a pair of double-ended contacts
piece "I, one back-spacing operation being per-v
I14, I15, thus establishing a circuit through con
ductors I20. a battery I20’ and magnet coil I2I, formed for each closure of the switch I11, I14,
I15. It isto be understood that if more than one
whereby the repeating mechanism on the phono
graph is actuated. A coil spring I13 serves to back-spacing operation is performed, the opera
tions subsequent to the ?rst one will merelyn'e 20
20 bias the ?nger-piece "I to its central or upright
suit in further retraction of thecarriage, the
position. It is to be noted that the motion re
quired to actuate the repeating control switch is other necessary functions having been performed
at right angles to that required for the clutch with the ?rst back-spacing operation.
Having thus described my invention, I claim:
control switch, thus avoiding any confusion as to
1. In- a phonograph, a carriage, a feed screw, 25
function. Furthermore closure of the repeating
control switch is accomplished by movement of carriage advancing means comprising a rotatable
?nger-piece I 1| in either direction so that suc
cestlve actuations of the back-spacing mecha
nism may be quickly effected by rapid oscillation
of the ?nger-piece. It is intended that the ?n
get-piece I" be moved by the index ?nger which
may be done without moving the hand from its
normal position about the clutch control switch.
The operation of the machine is as follows:
When it is desired to dictate, a record tablet A
is placed on the mandrel, the carriage is moved
to the beginning of the tablet and the control
lever 65 moved into recording position. The op
erator then dictates into the mouthpiece, main
taining the switch cover I 83 of the clutch con
trol depressed as long as'he is speaking into the
machine. If during the course of the dictation he
should be interrupted and upon returning desire
to listen to the last portion of the matter al
45 ready dictated, or if he should desire to make
. changes in the matter dictated, or if for any other
reason it is necessary that he listen to the Pre
viously dictated matter, he rocks or oscillates the
?nger-piece Ill, closing and opening the circuit
50 of the repeat magnet coil [2| one or more times,
thus causing any desired number of back-spacing
feed nut mounted on said carriage for coaction
with said feed screw, means to lock said feed nut
against play relatively to said carriage during
an advancing movement, back-spacing mecha 30
nism for said carriage, said mechanism being
adapted to cause rotation of said feed nut to cf
feet backspacing movement, and means asso- 1
ciated with said mechanism to render said look
ing means inoperative during a back-spacing op 35
2. In a phonograph, a sound box, a feed screw,
sound box advancing means comprising a gear,
wheel mounted for coaction with said feed screw,
braking means to eliminate play in said feed 40
wheel when it acts as a feed nut during advanc
ing movement of the sound box, sound box back
spacing mechanism comprising means to rotate
said gear wheel whereupon it coacts with said
feed screw as a pinion on a rack to eifect back
spacing, and means associated with said back
spacing mechanism for rendering said braking
means inoperative during operation of said back
spacing mechanism.
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