Oct. 29, 1946.' CONVEYER SYSTEM CONTROL Filed Nov. 16, 1944 //// //////// 2 Sheets-Sheet l / //////////////, INVENTOR. GERALD DEAKIN Oct. 29, 1946. 7 ~ I G_ DEAK?N 'I CONVEYER SYSTEM CONTROL 2,410,05l ' 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> i ` 1 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. ` ` 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. ` (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). ` . 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- i _ › 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; e e i i _ 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; > › i ' 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 ` i 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. i i i i 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 ` i i ' 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 ' ~ tion or 'operation thereof. i ` ` ~ › 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. ~ ' 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. i ~' ` e .e '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 ' . ' '~ 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. ' i i ' i 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 ` 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.