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Oct. 29, 1946.'
CONVEYER SYSTEM CONTROL
Filed Nov. 16, 1944
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2 Sheets-Sheet l
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INVENTOR.
GERALD DEAKIN
Oct. 29, 1946.
7
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G_ DEAK?N
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CONVEYER SYSTEM CONTROL
2,410,05l
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Filed Nov. 16, 1944
2 Sheets-Sheet 24
INVENTOR.
GERALD DEAKIN
BY
Wj
ATTORN Y
Patented Oct. 29, 1946
2,410,05l
UNITED STATES PATENT OFFICE
2,410,051 `
CONVEYER SYSTEM CONTROL
Gerald Deakin, New York, N. Y., assignor to Inter
national Standard Electric Corporation, New
York, N. Y., a corporation of Dela?ware
Application November 16, 1944, Serial No. 563,_756
16 Claims.
(Cl. 214-60>
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2
The present invention relates to a control for
a conveyer system and particularly to a control
for a conveyer system in which individual units
of the conveyer are arranged to automatically
discharge their load at predetermined receiving
Stations.
More particularly still the invention relates to
a control circuit so arranged that the major ele_
ments of the control are mounted in stationary
rying rollers 5 which run on` the tracks I.
The
various units of the conveyer are attached to a
cable 'l at spaced intervals therealong, the cable
being driven in any well known and suitable man_.
ner.
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The hangers 4 are formed at their lower ends
to provide pivot points for pins 8 which pins are
?xed to and extend from platform 9 on which
the goods are placed, normally manually.
positions at the various receiving Stations and 10
In accordance with my invention I provide on
only a small portion of thelcontrol apparatus is
each conveyer unit a plurality of keys !0 (Fig
carried by the individual moving units of the con_
ures 2, 4 and 5) together .with a potentiometer I l
veyer.
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(Figure 5) and three contact brushes !2, l3 and
It is an object of the invention to provide a
!4 (Figures 1, 3 and 5).
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conveyer system of the automatic discharging 15 At each receiving station I provide a contact
unit comprising the three segmental contacts !5,
type having a control, the major elements of
which are located at the receiving Stations.
!6 and l'l together with the circuit illustrated
It is another object of the invention toiprovide
such a control system as that mentioned in which
each unit of the conveyer can-les settable devices
in Figure 6 and including the magnet or solenoid
IS. The magnet |8 is provided with an armature
!9 which is adapted to operate against the rod 20
and minor circuit elements whereby the unit may
and thereby oscillate the arms 2l of the unit
be conditioned for discharging its load at any one
of a plurality of receiving Stations;
counterclockwise about their pivot points 22
thereby causing the unit to discharge its ,load by
Other objects and features of the invention
will appear when the following description is con
sidered in connection with the annexed drawings
in which-
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Figure 1 is an end elevationof aconveyer unit
_of a type to which my invention is applicable;
Figure 2 is a front elevation of the conveyer
unit of Figure 1;
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Figure 3 is a View similar to Figure 1 but show_
ing the equipment in its discharging position aft
er operation bythe circuit of the present inven_
ti-on;
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Figure 4 is _a front elevation of the unit in the
position illustrated in Figura 3;
Figura 5 is a schematic wiring diagram of the
portion of the control circuit located on each con
Veyer unit; and
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virtue of the inclination of the ,platform 9, as il_
lustrated particularly in Figures 3 and 4.
As has been indicated, the circuit elements pro
vided'onfeach conveyer unit comprise the poten_
tiometer l l which is tapped at various points and
-tolwhich connection can be made by operation
of the keys IO. Current is :fed to the potentiom
eter through the brushes l2 and l4› and the po-?
tential existing at the brush !3 isdetermined in
accordance with` the operation of the keys ID_
These keys ll] are preferably looking keys which
will retainitheir closed position when set until
released, either manually or automaticallyas the
case may be. At each receiving station in addi
tion to the contact segments !5, !6 and I'l there
is provided acircuitincluding the recti?ers 23,
40 24 and 25, electron tube 26, potentio?neter 21 and
`resistance 28. The rectiñer units of the recti?ers
23, 24 and 25 are poled so that current will ?ow
from positive to negative in the direction of the
ceiving station.
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arrows. The ?lament 29 of tube 26 is heated by
l- Referring now toFigures l through 4 which il
lustrate a preferred form of conveyer system to 45 virtue of current supplied from a suitable source,
a Figure 6 is a schematic wiring diagram of the
portion of the control circuit locatediat each re
which my control may be applied, it?will be seen
shown in this instance as an A. C. source, through
that the conveyer comprises a pair of.tracks I
which are Suspended adjacent each other by
course be used if desired.
means of a bracket 2, or any other suitable sup_
port, which bracket is in turn a?ixed to an over~
head surface as, for example, the ceiling 3 of the
room.` Obviously, the tracks `-may be supported
in any other suitable manner and at any conven
ient height. Each conyeyerá_unit` comprises the
hangers 4 which dependfrcm _theshaftsj car
the transformer 30.
A D. C. source could of
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The details of the` circuit are best described by
reference to the operation of the system. .In set
tíng up the system each receiving station is ad
justed so that it will be rendered operative?when
a conveyer unit closes circuits through the con
tacts !5, IG and l'l. and brushes l2, l3 and !4 when
a particular key ?n has been operated. Thisjad
3
4
justment involves merely the setting of the var..
reaches the receiving station adjusted to corre
iable contact'3l of potentiometer 21 to a position
spond to the key operated upon the unit, the k
corresponding to the tap point which is connected
by operation of the particular key [G considered.
potential applied to the right and lefthand ends
Let it be ?rst assumed that the conveyer unit
under consideration is travelling between receiv
ing Stations and that, therefore, no circuits are
of recti?er unit 25 over the circuits previously
described is substantially equal.
consequently
the negative bias is removed from the grid 40 of
tube 26 and current then ?ows through the cir
cuit comprising recti?er 24, conductor 46, the two
completed through the contacts l'5, ?s and IT and
legs of ?lament 29 in parallel as a cathode, plate
the brushes [2, !3 and !4, respectively. Under
these conditions, current ?ows normally from 10 4?, conductor 48, magnet [8 and conductor 49.
Operationof magnet !8, as has been described,
the positive to negative terminal of recti?er` unit
23 over one circuit including conductor 32 and
potentiometer 21 and over another circuit includ
ing conductor 33, resistance 28, ccnductor 34, rec_
ti?er unit 25, conductor 35 to variable tap 3| and
part of potentiometer 27 to the negative terminal
of recti?er unit 23.
The righthand side of rec
ti?er unit 25 is thus made positive and the left
side negative and current ?ows through two par_ '
causes operation of bar or roller 20 and eleva
tion of the arms 21 so that these arms unlatch
from the latching bars of the conveyer unit and
permit the platform 9 to drop into the position
shown in Figure 3 thereby discharging the load at
the selected receiving station.
As has been stated hereinabove, platform 9 may
be restored manually by the operator at the re
allel paths, one including recti?ers 31 and 33 and_ 20 ceiving station Or may be automatically restored.
such automatic restoration can be effected by the
the other rectiñers 39 and 38. Since recti?er 31 is
use of a cam 50 (Figures 1 through-4) and a
positively polarized and recti?er 36 negatively po_
bracket such as 51 (Figure l). It will be seen
larized, the former has a low impedance and the
that when the carrier or conveyer unit in its
latter a high impedance. Likewise, since recti_
traverse reaches a bracket such as 55, the cam
?er 39 is negatively polarized and recti?er 38 pos
ming surface 50 rides up on the bracket andre
itively. polarized, the former has a high imped
ance and the latter a low impedance. Thus ?la
,stores the platform, to its horizontal position
causing the arms 2! to latch behind the latching
ment or cathode 29 of tube 25 is made positive
withrespect to grid 40 and no or a very small
The keys ?o may either be reset by the receiv
current ?ows from the cathode' 29 to plate 41. 30
ing station operator or may be automatically .
It will be seen that the left side of recti?er 25 will
reset. such automatic'operation can be effected
be weakly or strongly negative according to the
by utilizing keys of the latching type having slides
position of tap 3! on potentiometer 21.
which may be operated by cam' surfaces con
Now if the unit arrives at a receiving station
other than the one selected, a circuit will _be 35 nected to the platform 9 either upon the restora
bars.
,completed which will apply positive potential over
conductors 33 and 4! and through contact I 5
and brush l2 to_ the upper terminal of potenti
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tion or 'operation thereof.
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While I have described a preferred'embodir'r'?ent `
of my invention, many different forms thereof
may be utilized and, therefore, I wish to be lim
ometer Il. , Likewise, a circuit will be completed
from the negative side of recti?er 23 over con~ 40 ited not by the_ foregoing description but solely
by the appended claims.
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ductor 42 and contact l'l and brush [4 to the
lower side of potentiometer H.
In 'addition, a
What is claimed is:
,
circuit will be completed from the righthand' end
I 1. In a control circuit for causing the unload
of the recti?er unit 25 over conductors 34 and
ing of a conveyer at any one of a plurality of
43, contact 16, brush !3 and conductors 44 and 45 points on its traverse, in combination' a tapped
45 to any operated? key w, and thence through
potentiometer on the conveyer, settable means_
that key to thecorresponding tap point'on po;
forselectingone of said tapsz a variable poten
tentiometer H.
since the setting of the key
tiometer at'each unloadingpointpmeans for ad
_does not correspondcwith the setting of 'variable
justingsaid'_ last mentioí?edpotentiometer to core
contact ,317 of potentiometer 21, there will be a 50 respond with the'setting of any one'of said set
difference of potential existing at the right and
table means, means at eachunloading point to
supply an Operating voltage tólsaidpotentiom
left ends of the recti?erunit 25. This difference
in potential will _operate in the manner described
eters in parallel, an impedance unit comprising
above in connection with the circuit through re
two'parallel'branch "circuits each includinglitwo
sistance .28 to provide a negative bias on' tube 55 oppositely poled uni-directional impedances-in
4.0 and 'this tubewill continue to be non-conduct
series, the impedances of one› branch? being_ re
ing. If, for example, _the potential existing on
conductor 44, 45,', brush !3, contact Hi, conductor
43 and„ therefore, at the _righthandend of the
,recti?er unit .25 is more positive, than thàt'exist '60
ing oncontact_ 3,]` `and at the lefthand encl- of
recti?er 25, then _due to the low impedar?ce of
_recti?er 3? .to current flow in't'hat direction and'
the high impedance _of recti?er 36 a relatively
high positive potential will exist on the cathode 65
' _ 29 of_ tube 26.4› Likewise, because of the high im
versely poled withrespect to correspcnding im
pedances in_ the other branch, whereby current
?ow in either direction through said unit _causes
the common terminal of the two impedances in
one branch to have a'relatively higher positive
potential than the ícorresponding point in 'the
other branch, means connecting oneterminal of
said impedance unit to the tap-point on said con
veyer potentiometer, and means connecting the
other terminal of said' impedance unit to the un'
pedance of recti?er 39 'and the low impedance
`Vof'recti?er 33 a relatively high negative potential
loading point potentiometer whereby when the
'plied by it is negligible.
points on its tr_avers?,~"in combination: a poten
potentiometers are similarly adjusted no current
will exist on' grid `4!) of the tube. It should be
flows and the two common connections between
'understood that in this event although the bias 70 impedances in the branches of theimp?dance
unit are atthe same potential.
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'ing resistance 28' is still incircuit, it is now sub
`star?tially in_ parallel With the circuit through the
2. In a control circuit for causing itherunload
ipotentiometer Il and` consequently the bias sup
ing of a conveyer at any one of'a plurality of
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'~ When the conveyer unit under con?ideration 75 tiçmeter'von *the eonveyergša plurality of :taps on
2,4'1 0,05 1
5
6
said potentiometer, settable means for selecting
common impedance terminals of the two
branches, said device' being normally biased to
inoperative condition, and means operable upon
the conveyer reachinga selected unloading point
one of said taps, a potentiometer at each unload
ing point, a variable contact on each said po
tentiometer; an impedance unit comprising two
parallel branch circuits each including two op
positely poled unidirectional impedances, the im
pedances of one branch being reversely poled with
to cause cessation of current ?ow through said
impedance unit and operation of said potential
`responsive device.
5. In a control circuit for causing the unloading
respect to those in the other branch, whereby
of a conveyer at any one of a plurality- of points
current ?ow in either direction through said unit
causes the common terminal of the two imped 10 on its traverse, in combination, an impedance unit
at each unloading point, each unit comprising two
ances in one branch to have a relatively positive
parallel branch circuits, each including two op
potential with respect to the corresponding point
positely poled unidirectional impedances, the im
in the other branch, means to supply an oper
pedances of one branch being reversely poled with
ating Voltage to said unloading point potentiom
eters, commutator means for supplying the same 15 respect to those in the other branch, whereby cur-`
rent ?ow in either direction through said unit
Operating voltage to said conveyer potentiometers
causes the common terminal of two impedances
in one branch to be at a relatively higher positive
mutator means for supplying the potential from
potential than the corresponding point in the
a selected tap point on said conveyer potentiom-`
eter to one terminal of said impedance unit, and 20 other branch, means for normally causing'cur
rent ?ow through said impedance unit, a triode
means for supplying the potential from the varia_
' when the conveyer is at an unloading point, com
ble contact of said unloading point potentiometer
having its grid-?lament circuit connected across
to the other terminal of said impedance unit.
3. In a control circuit for causing the unloading
on its traverse, in combination, a potentiometer
the common impedance terminals of the two
branches, said triode being normally biased to
inoperative condition, means operable upon the
conveyer reaching a selected unloading point to
on the' conveyer, a plurality of taps on said po
cause cessation of current ?ow through said im
tentiometer, settable means for 'selecting one of
'said taps, a potentiometer at each unloading
point, a variable contact `or? each said potenti›
ometer, an impedance unit comprising two par«
pedance unit and operation of said triode, and
magnetic means in the plate circuit of said triode
for Operating said conveyer to unloading position.
allel branch circuits each including two oppo
of a conveyer at any one of a plurality of points
of a conveyer at any one of a plurality of points
6. In a control circuit for causing the 'unloading
on its traverse, in combination, animpedance unit
at each unloading point, each unit comprising
35 two parallel branch circuits, each including two
oppositely poled unidirectional impedances, the
current ?ow in either direction through said
impedances of one branch being reversely poled
unit causes the common terminal of the two im
with respect to those in the other branch, whereby
pedances in one branch to have a relatively posi
current ?ow in either direction through said unit
tive potential with respect to the corresponding
point in the other branch, means to supply an 40 causes the _common terminal of the two imped
Operating voltage to 'said unloading point poten
ances in one branch to be at a relatively higher
positive potential than the corresponding point
tiometers, commutator means for supplying the
in the other branch, means for normally causing
same 'Operating voltage to said conveyer poten
sitely poled unidirectional'impedances, the im_
pedances of one branch being reversely poled with
respect to those in „the other branch, whereby
current ?ow through said impedance unit, a po
tentiometer on said conveyer, taps on said poten
tiometer, settable means for selecting one of said
tiometer when the conveyer is at an unloading
point, commutator means for supplying the po~
tential from a selected tap point on said conveyer
potentiometer to one terminal of said impedance
unit; means for supplying the potential from the
taps, a potentiometer at each unloading station,
a'variable contact on each unloading station po
variable contact of said unloading point poten
tiometer to the' other terminal of said impedance r
unit, and potential responsive means connected
tentiometer, means for applying an Operating po
tential to said unloading 'station potentíom
across the common terminals of the two im'
pedances of one branch circuit of said impedance
unit and the common terminal of the two im
ating potential to the conveyer potentiometers,
eters, commutator means for applying said oper
means connecting the variable contact of each
unloading station sp-otentiometer to one terminal
pedances in the other branch of said impedance .. of said impedance unit, commutator means for
unit, whereby when the unloading point potenti
öonnecting the selected tap of the conveyer po
ometer and the conveyer potentiom?ter are sim
ilarly set no current ?ows through the impedance
tentiometer to the other terminal of said imped
ance_ unit when said` conveyer reaches any un-`
unit and'the potential responsive device is oper
ated.
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4. In a control circuit for causing the unloading
'of a conveyer at any one of a plurality of points
on its traverse, in combination, an impedance unit
loading station, and a triode having its grid ?la
(30 ment circuit connected across the'common im
pedance terminals of the two branches, 'said tri_
ode being normally biased to inoperative condi
tion, means operable upon the conveyer reaching
at each unloading point, each unit comprising two
a non-selected unloading point to apply a higher
parallel branch circuits, each including two 01:›~ 63 potential to oneterminal of said impedance unit
positely poled unidireetional impedances, the im
than to the other and continue the biasupon the
pedance's of one branch being reverselypoled with
triode;` and means operable upon the conveyer
respect to those in the other branch, whereby cur
reaching a selected unloading station to appl?y
equal potentials to the terminals of the impedance
rent ?ow in either direction through said unit
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causes the _common terminal of two impedances 70 unit to remove the bias from said triode.
in one branch to be at a relatively higher posi
tiveipotential than the corresponding point in the
other branch, means for normally causing cur
rent ?ow through said impedance unit, and a po
tential' responsive device connected across the
7. In a control circuit for causing the unload
ing of` a conveyer at any one of a plurality of
points on its traverse, in combination, an impedu
ance unit at each unloading point, each unit com
prising two parallel branch círcuit's, each includ
2,410,051
when the current flows in one direction than when
the current flows in the other direction, said par
10
parallel circuits being reversely connected where-'
by the two common terminals have opposite po
tential variations with any given change in cur
rent ?ow, whereby current flow through said im
pedance assembly produces a potential bias be
a change in the rate of current ?ow.
tween said common terminals which potential
14. In a control system for a conveyer of the
bias is in the same direction regardless of the
type wherein there are a number of stations at
direction of ?ow of current through said parallel
which materials from the conveyer may be un
circuits, and each of said stationary assemblies
loaded and it is desirable to select the station for 10 also including means responsive to the existence
the unloading of each unit of material prior to
of a zero potential bias between said common
the arrival of the unit of material to the station,
terminals to identify the arrival of the units of
the combination of, a plurality of stationary cir
material to be unloaded at that particular sta
cuit assemblies corresponding in number to the
tion.
e
unloading stations and each having contactor 15
15. In a conveyer system of the type Wherein
means positioned at its respective station, and a
there are a number of stations at which ma
plurality of movable units each adapted upon
terials may be unloaded and signal means is pro
energization to produce a distinctive output po
vided on the conveyer to move with each unit of
tential said movable units being mounted re
material to produce a distinctive voltage indicat
spectively to move with the various units of ma 20 ing that that particular unit of material is to be
terial and having movable contactor means po
unloaded at a particular station and wherein each
allel branch circuits being reversely connected
whereby the two central points have their volt
ages changed by di?erent amounts when there is
sitioned respectively to engage the various con
station is provided with means to produce a dis
tinctive potential, an impedance means positioned
at a station and adapted to be connected between
cluding means constituting a, source of potential 25 the potential produced by the signal means on
which is supplied to the various movable units
the conveyer and the potential produced at the
tactor means at the respective unloading Stations,
each of said stationary circuit assemblies in
through said contactor means as the various mov
able units are positioned at the respective un
station, said impedance means comprising two
parallel branch circuits each formed by two op-.
loading Stations, each of said stationary circuit
positely poled unid'irectional impedances with
assemblies also including an impedance assembly 30 one branch circuit being reversely poled with
and a stationary unit connected to the source of
respect to the other branch circuit, whereby a
potential and having an output potential circuit
current ?ow through the circuits in either di
connectable through said impedance assembly
rection causes the common terminal of the two
and said contactor means to the output potential
impedances in one branch circuit to be at a rela
of each of the movable units, said impedance 35 tively higher positive potential than the corre
assembly comprising two parallel circuits each
sponding point in the other branch circuit.
formed by a pair of impedance units the imped
16. Apparatus as described in claim 15 which
ance of each of which is greater when the current
includes, an electronic device having a controlled
?ows in one direction than when ?owing in the
circuit and a control grid which control grid is
other direction with the impedance units of each 40 connected to be biased by the potential di?erence
parallel circuit being reversely.coupled at a com
existing between said common terminals thereby
mon terminal whereby for any given value of
to prevent the ?ow of current through the con
current ?ow the potential of the common ter
trolled circuit, and means responsive to the ?ow
minal is different when the current is ?owing
of current through said controlled circuit to un
in one direction from what it would be if the cur 45 load the conveyer.
rent were ?owing in the opposite direction, said
GERALD DEAKIN.
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