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Патент USA US2405588

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Aug. 13, 1946.
'- ‘2,405,588
Filed April 22, 1943
Q Ln’
Patented Aug. 13, 1946
Rudolph F. Mallina, Hastings on Hudson, N. Y.,
assignor to Bell Telephone Laboratories, In
corporated, New York, N. Y., a corporation of
New York
Application April 22, 1943, Serial No. 484,096
5 Claims.
This invention relates to rotary driving mech
anism and the object of the invention is a de
coupling and recoupling means whereby a driven
member may be disconnected from its drive and
stopped at any instant and then quickly recon
nected to the driving member in exactly its orig
inal angular relationship with the driving
(Cl. 192-144)
on the other contact to avoid the possibility of the
mechanism being stopped with the stator winding
For clarity of illustration, the spacing between
the‘ earn 2!! and the gear Iii has been greatly in
creased’ and it will be understood that in prac
tice the follower 19 would be relatively short and ‘
so light as to be easily held in contact with the
According to the invention, the driven member
cam, as for example, by the restoring force of
is connected to the drive in accurately predeter 10 the de?ected contact spring 2 i. Similarly an ap
mined angular relationship by an electrically
preoiable spacing is shown between the armature
controlled latching device and carries an arma
l5 and the body of the electromagnet l6 but in
ture which normally rotates freely with respect to
practice when electromagnet is energized, the *
stationary magnetic braking means.
usual axial motion of the shaft 8 may be prac
The driven member may be brought to rest at 15 tically eliminated by plating the inner face of
any desired instant by operating a control key
the armature with chromium to provide. a mag
which releases the latching device and simulta
netic separator in which case the armature may
neously energizes the magnetic brake. When the
rotate in contact or on the verge of contact with
key is released, the brake is deenergized and the
the body of the magnet as in the structure shown
driven member is recoupled to the drive by a mo 20 in Patent 2,003,913 to Wente.
tor which rotates the driven member in the proper
The shaft 8 is connected through suitable gear
direction to engage it with the latching device
ing to a recoupling motor 22 which is of the con
with minimum travel. This saving of time in
ventional reversing type with its reversing wires
the recoupling operation is effected by means of
23, 24, 25 connected through slip rings 26, 21 and
direction contacts in the motor circuit which are 25 28 on the shaft 6, to the contacts of the switch
closed selectively in accordance with the angular
displacement of the driven member from the pre
I8. Similar rings 29 to 32 are provided for the
external connections to the latching device 9.
determined angular relationship.
With the apparatus in the condition shown, the
In the drawing, Fig. 1 is a rotary driving mech
motor 5 is driving both potentiometers but the
anism according to the invention and Fig. 2 is a 30 circuit to motor 22 is open at contact 33 of the
developed view showing the latching mechanism
latching device. When the key 34 is depressed,
and the cam which controls the recoupling motor.
the breaking of contact 35 opens the energizing
The mechanism of this invention may be used
circuit of the magnet l ! whereupon the spring 33
for various purposes but in the embodiment shown
retracts the armature I2 from the notch l3 and
by way of illustration, the potentiometers l and 2 35 closes contacts 33. This disconnects the shaft 8
are normally rotated to produce cyclically vary
from the motor 5 but the circuit of motor 22 re
ing voltages in the work circuits 3 and 4, respec
mains open due to the opening of contact 31 on
tively. The motor 5 drives the shaft 6 directly.
the key 34. The closing of contact 38 on the key
through suitable reduction gearing ‘l and drives
energizes the magnet 16 which attracts the arma
the shaft 8 indirectly and intermittently through 40 ture i5 and arrests the rotation of the ‘poten
the latching device 9 rotating with the gear Ill.
tiometer 2. In apparatus of this type, the poten
The device 9 comprises an electromagnet ll hav
tiometers are usually driven at very low speeds
ing a pivoted armature l2 which is held by mag
such as oneor two revolutions per minute and by
netic attraction in the position shown with the
proper timing of the operation of the contacts of
tapered end of the armature engaging the V notch 45 the key 34, the shaft 8 is stopped almost in
I3 in ring I4 which is secured to the shaft 8.
The shaft 8 also carries an annular magnetic
When the potentiometer 2 is to be reconnected
ring armature l5 and extends to the arm of the
to the drive, the key 34 is released thereby open~
potentiometer 2 through a stationary electromag
ing at contact 38 the circuit of the braking mag
net 16 mounted on the frame I‘! of the apparatus. 50 net IE and closing at contact 35, the circuit of
The gear [0» is provided with a reversing switch
the latching magnet H which forces the armaa
l8 which is operated by the cam follower IS in
ture 42 into sliding contact with the ring 14. In
cooperation with the cam 26 on the shaft 8. The
this position of the armature I2 contact 33 re
switch I8 is preferably of a type which, when
mains closed as shown in Fig. 2 and the closing
operated to open one contact, automatically closes 55 of contact 31 on the key 34 completes the power
supply circuit to the recoupling motor 22. This
motor rotates the shaft 8 at a relatively high
speed compared with the speed of shaft 6 until
the notch l3 in the ring M is aligned with the
armature I2. The magnet H then forces the
armature into the notch, the circuit of the motor
22 is opened at contact 33 and the potentiometer
2 is driven by the motor l5 in exactly its former
angular relationship with the potentiometer I.
In order to recouple the shaft 8 to the shaft 51
an unlimited number of revolutions, a latching
device connecting the shaft to the member in
predetermined ‘angular relation, magnetic brak
ing means for the driven member, a switch,
means operative in one position of the switch at
any angular position of the driven member for
releasing the latching device and energizing the
braking means and restoring means operative in
another position of the switch for rotating the
member into engagement with the latching de
vice to restore the predetermined angular rela
tion between the shaft and the member.
of the shaft 8 during this recoupling operation
2. A drive, according to claim 1, having con
should be opposite to the direction of rotation of
tacts operated in accordance with the angular re
the shaft 6 except when at‘ the instant the key‘
34 is released, the moving armature has passed 15 lationship betwen" the shaft and the member for
determining the direction of rotation of the re
but is still relatively near the notch l3 in the
storing means.
then stationary ring It.
3. In a rotary drive, a rotating drive shaft and
The cam 20 on the shaft 8 is therefore shaped
a driven shaft capable of rotating together for an
so that the switch 18 is closed to the left to con
nect conductors 24 and 25 together to give oppo 20 unlimited number of revolutions, means for cou
pling the shafts in predetermined angular rela
siterotation to the shaft 8- during the major part
in the minimum time, the direction of'rotation
of a revolution of the gear I0 with respect to the
The follower I9 is mounted on, the gear Iii di
tion comprising a ring having a notch mounted‘
on-one of the shafts and alatching device mount
ed on- the other shaft and engaging the notch in
the ring, braking means for the driven shaft,
ametrically opposite the armature I2 and with‘
switching means operable at any point in the ro
shaft 8 in the position shown in Fig; l. The fol
tation of the driven shaft to disengage the latch
lower is- engaging the cam 20 at a point adjacent
ing device and energize the braking means to‘
the-elevated position 39. If when the key 34 is
stop the driven shaft‘, means for driving‘ the
released, the shaft 6 has rotated only slightly
beyond the notch l3 as shown in Fig‘. 2, the fol 30 driven shaft to‘ reengage the latching device,- a
control circuit therefor and means operated upon’
lower [9 will be on this elevated portion 39 of
the reengagement of‘ the latching device for dis
the cam, the switch l8 will be closed to the right
and‘ the motor 22 will drive to shaft 8 in the
same direction as shaft 6 until the notch I3 over
abling thedriving means.v
4. A drive, accordingv to“ claim» 3,. inwhicn the
driving‘ means is a motor, in combination with
takes the armature 12‘. However, if, when the
contacts mounted on- one of the shafts for re
key 34 is released, the armature has‘v rotated so
versing the direction of rotation of the driving
far beyond the notch that the follower i 9 is con
means, a cam mounted on the other shaft and
tacting' the lower portion of the cam, the switch
means cooperating with the cam for selectively
I8 will be‘ closed to the left' and the motor 22 will
drive the shaft 8 in the clockwise direction (as 40 operating the contacts to condition- the driving
means for rotation in one direction when the
viewed in Fig. 1) until the notch 13 meets the
drive shaft islagging with respect to the driven
armature l2. Gne end of the elevated portion
shaft and for rotation in the other direction
of the cam should be aligned with the‘ notch it‘
when the drive shaft is leading with respect to
as shown inFig‘. 2‘ but the proportion of the total
gr the-driven shaft.
circumference of the cam 23 over which the ele
5‘.v In arotary drive, a‘ rotating drive shaft, a
vated portion 39 extends may, of course, be var
driven. shaft coupled'thereto in predetermined
ied to suit the, conditions of the particular case.
angular relationship‘, a switch means actuated in
In the mechanism shown, the rotor of motor
one position of the switch, for decoupling and
22- is driven, by the shaft‘ 8 when that shaft is
connected to the‘ gear l0. If this load is. objec- .31‘ stopping the, driven shaft. substantially instanta
neously, means actuated in another position of
tionable the shaft of this motor may be, provided
the switch for rotating the driven shaft into the
with a. conventional electromagnetic clutch which
predetermined angular relationship with the
is engaged only when the shaft 8 is disconnected
drive shaft‘, and means: operated in. accordance
from the‘ gear in. This maybe effected for ex
ample by energizing the clutch through contact
,, with, the angular displacement‘ of. the. shafts from
380i therkey 34.
Whati's claimed is:
I. In arrotary drive, a rotating drive shaft and
a. driven, member capable of rotating together for
the direction of rotation of the driven shaft’when
the switch is moved into‘ said other position,
the predetermined: relationship‘ for determining,‘
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