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March 22, 1938. E. w. BLEAM 2,111,921 AUTOMATIC WEIGHING APPARATUS Filed April 28, 1933 6 Sheets-Sheet l v INVENTOR. . 閕?aiiupy. % �ATTORNEY. March 22, 1938. E. w. BLEAM 1 2,111,921 AUTOMATIC WEIGHING APPARATUS Filed April 28, 1933 ?0% " H 1%? 6 Sheets-Sheet 2 ATTORNEY. March 22, 1938. I E. w. BLEAM - 2,111,921 AUTOMATIC WEIGHING APPARATUS Filed April 28, 1933 40 1? /G R 6 Sheets-Sheet 3 674/ Fla:5?0-4 O 1?MP16? 11:12 INVENTOR. BY <2; ,4 ' I @M M ia/ . gig?! �ATTORNEY. March 22, 1938.? E, w. BLEAM 2,111,921 AUTOMATIC WEIGHING APPARATUS Filed April 28, 1933 6 Sheets-Sheet 4 INVENTOR. ?March 22, 1938. E. w. BLEAM _ 2,111,921 AUTOMATIC WEIGHING APPARATUS Filed April 28,? 1933 e She閠s-Sheet 5 BY �ATTORNEY. . March 22, 1938. 2,111,921 E. w. BLEAM AUTOMATIC WEIGHING APPARATUS Filed April 28, 1933 6 Show-Sheets INVENTOR. C047?. 3!. $4M =64 Ebb ?e?;- ATTORNEY. Patented M... 22, 1938 2,111,921 UNITED STATES PATENT OFFICE 2,111,921 AUTOMATIC WEIGHING APPARATUS Edgar W. Bleam, Philadelphia, Pa., assignor to Stokes and Smith Company, Philadelphia, Pa., a corporation of Pennsylvania Application April 28, 1933, Serial No. 668,333 4 Claims. My invention relates to apparatus for auto matically weighing and delivering solid mate rials, such as nuts, seeds, nut meats, candies of (Cl. 249-42) main feeding device MF, and another stream passes through conduit 2 to the dribble feed mechanism DE?. The outputs of these feeding uniform or odd shapes, short-cut macaroni or devices, regulated as hereinafter described, pass 5 spaghetti, cereals, washers, bolts, etc., of widely varying characters, sizes and shapes. into the container R of a, scale S. The main feed device comprises the disk 3 In accordance with my invention, the material may be fed by a conveyor to a chute, or equiva lent, discharging into the receiving receptacle of w a scale which immediately upon attaining bal ance effects movement of structure, preferably a brush, to arrest material about to enter the re ceptacle from the chute. In some forms of the invention, the conveyor 1| runs continuously, whereas in other forms the conveyor is stopped after the correct or nearly the correct amount has been fed to the recepta directly below the conduit 1 of hopper H, and the conveyor belt 4, whose upper lift receives the material M from-disk'3. The telescoping end la of the conduit 1 is adjustably held as by clamp pa 0 5 at a suitable distance above the surface of the disk 3 to regulate the feed of the material M to the disk. The stationary member 6 provides a barrier preventing the material from moving off the disk except at the opening or gap 1 prefer ably variable in extent by adjustment of the gate member 8. The barrier members 9, lil extending cle; in a preferred form, the conveyor quickly in the direction of travel of the conveyor 4 form feeds all but a few percent of the desired, weight ' continuations of the barrier 6. At least one of and then stops, the exact weight being/,dbtained them, barrier element III for example, is adjust 20 20 by a dribble-feed device which preferably, though able to permit variation of the width of the stream of material on the conveyor 4. As shown, not necessarily, runs continuously. My invention also resides in the features of this element may'be supported by the rods II, 12 arrangement extending through the stationary brackets l3, I4, as hereinafter described and claimed. For an understanding of my invention and for rear end of the barrier may, as indicated, be combination, construction and illustration of speci?c modi?cations thereof, ref erence is to be had to the accompanying draw ings in which: Fig. 1 is a side elevational view of weighing and delivering apparatus. Fig. 2, on enlarged scale, and in perspective, gustlrates details of the feeding mechanism of g. . Fig. 3 is a detail view on enlarged scale, of the ? driving and control apparatus for the mecha nism shown in Fig. 2. Fig, 3a is a modification of the mechanism shown in Fig. 3. 40 ?Fig. 4, in perspective, diagrammatically illus trates automatic clutch tripping mechanism. Fig. 5, in perspective, illustrates a modification of a pedal-trip clutch. _ Fig. 6 is a detail view on enlarged scale,? of a 45 modi?ed type of conveyor feed. ' Fig. 7 is a top plan view of parts shown in Fig. 6. Fig. 8 in perspective illustrates a modi?cation of mechanism shown in Figs. 1 and 2. Fig. 9 illustrates diagrammatically a pneu and adjustably held as by the bolts l5, IS. The 5 provided with an offset extension 11 to receive bolts [8 which pass through the slots IQ of the extension 20 of barrier 6. The bracket II, and a similar bracket on the opposite side of the conveyor support the frame members 2| of the chute 22 which directs the material from the conveyor into the receptacle R. 'The chute is preferably provided with an adjustable end 23, to permit adjustment of the effective length of the chute. The main feed mechanism is driven from motor 24 as herein after described. - The dribble feed device comprises a disk 25 also driven from motor 24, and preferably continuous 40 ly. The shaft 26 of disk 25 is journaled in the pivoted bracket 21 and connected to its driving shaft through a universal joint 29. The angle of the axis of rotation of disk 25 can therefore be ad justed by loosening the clamping bolt 30 from 45 bracket 21, tilting the ?bracket to the desired posi tion, and retightening bolt 30. The feed of the material to the disk is controllable by adjustment of the telescoping end 20. of conduit 2 which can is preferably divided, so that one stream of the be held in position by tightening of clamp 3|, and also by the arcuate barrier member 32 which is supported by the rod 33 adjustably held to bracket 34 by the clamping bolt 35. The disk 25 is pro vided with ?a plurality of openings 38 suitable to as material passes through the conduit l to the receive one element E of the mass of material M 50 matic bag opening device included in Fig. 8. Referring particularly to Figs. 1 and 2, the hopper H containing the material to be weighed 2 2,111,921 so that as the disk revolves underneath the ac cumulation or pile below the conduit 2, each of these openings will receive one element. The disk 29v revolves above and in contact with or closely adjacent to a plate 99 whose surface is ?unbroken except at the discharge region above the chute 91, so that the elements E within the openings 99 of disk 29 are retained until they pass above the discharge opening 99 of plate 99. The guard ring 99, chain 69, sprocket ?I9, chain ?II and sprocket 12. The arm I3 attached to shaft 99 rotates in clockwise direction as viewed in Fig.? 4, the pin ?I4 extending therefrom engaging the lever ?I5 to open the door 4| of the bucket R through linkage com prising the arm ?I6 connected to the shaft ?II of the door, the arm ?I9 attached to the shaft ?I9 and the link 99. As indicated, the link 99 is substan~ tially on dead center when the door is closed. 10 49 is preferably attached to and rotatable with the . Continued rotation of arm ?I3 causes the pin ?I4 to disk 29 as this provision tends to keep the ac pass beyond the end of arm ?I5 whereupon the cumulation of material in agitation and facilitate door 4I swings closed, the arm 19 continuing its the movement of elements E into the openings 39. rotation until the pin ?I4 again comes in position With the speci?c mechanism thus far de above arm ?I5. 15 scribed, the main feed is so adjusted that during During the latter part of the rotation of arm the portion of the cycle for which the main feed ?I9, pin ?I4 engages the end of a slot 9| of the is effective, the amount of material fed into the member 92 pivoted to the arm 99 secured to shaft container R is slightly less than the amount re 41, so that shaft v4?I is returned to the position quired to effect balance of the scale 8, i.'e., a large shown in Fig. 4; the latch 49 substantially upon 20 percentage of the amount desired is received by completion of the movement drops into position the container R within a short space of time. to relatch the shaft 41. The additional slight amount necessary is re The cam 94 (Fig. 3) secured to shaft 69 engages ceived from the dribble feed device which con the roller 99 secured to the upper end of the slidtinues to add additional elements E one at a time ing member 99 whose lower end is connected to so that the degree of accuracy is very high. The arm 91, to lift the member 99 attached to the extension 29 of the chute is adjusted so that it is same shaft 91a as arm 91 from the position for only slightly above the level of the material when which it locks or prevents movement of the scale the desired weight thereof is in the container R; beam 99. This release of the scale beam is prefer this contributes to steadiness of the scale. When ably eifected just before the beginning of the ef exactly the correct amount to obtain balance is fective dribble feed, 1. e., just before completion of in the receptacle R, the movement of the scale the main feeding period. arm to balanced position effects, as through a control system hereinafter speci?cally described, downward movement of the gate member G, preferably a brush, to obstruct the chute 2| and prevent further flow of material. It is not necessary to discontinue the dribble feed because the additional elements E of ma terial, comparatively few in number, simply ac cumulate behind the brush G and are added to v the bulk delivered by the next operation of the main feeding device. _ With the brush or gate 6 closed, the door H for the receptacle R is opened by mechanism herein 45 after described to discharge the weighed material into a suitable container held below the funnel or spout42 by an operator, or transported thereto by suitable conveying mechanism. The brush arm 43 is normally held in the raised 50 position against the bias of spring 44 (Fig. 4) by the bar 45 which engages the ?nger 46 secured to shaft 440. Bar 45 is secured to the upper end of the shaft 41 which is biased for rotation from the position shown in Fig. 4 by the spring 49 but is re 55 strained from such movement by the latch 49. When the scale is balanced, it effects or permits closure of the contacts 59, 5| to complete a circuit including the solenoid or electromagnet 92, the movement of whose armature 59 effects tripping 60 of the latch 49. The release of shaft 41 for movement by spring 10 20 . 30 The cam 99 secured to shaft 99 engages the roll 9| to move the slidable bar 92 to the right, as viewed in Fig. 3, to move the latch 99 out of engagement with the clutch member 94, so that 35 the spring 99 is effective to move the driven member 99 of the clutch, which ?is secured to bracket 91 held fast to the shaft 99?as by pin 99. into the path of the teeth I99 of the driven clutch member I 9|. The motor 24 effects con 40 tinuous drive of the driving clutch member I9I through the sprocket I92, which is secured to the same shaft as sprocket ?I9, chain I99, and sprocket I94. To the shaft 99 is affixed the driving roll I95 (Fig. 2)- of the conveyor belt 4, and also the gear I99 (Fig. l) which engages gear I99 on shaft I99 to drive the main feed .disk 9. As appears from Fig. 3, after shaft 99 has made one revolution, the ?nger 94 again engages the latch 99, which in the meantime has 50 returned to its original position, whereby the driven member 96 is rocked out of engagement with the driving clutch member, to effect dis continuance of the main feed. The duration of the main feeding movement is therefore de?nite and ?xed. The amount of material transferred during this movement is controllable by the sev eral expedients previously described. The dura tion of the dribble feed on the contrary is deter mined solely by the apparatus itself, 1. e., the 60 dribble feed continues until the scale is balanced. I 49 swings the bar 45 away from ?nger 49 permit Brie?y, the main feed is initiated by the cam 99 ting the brush G to be swung by the spring 44 to of shaft 99 and terminates when shaft 99 has discontinue the flow. The rotation of the shaft 41 made one revolution. Shaft 69 is arrested when 65 also effects separation of the contacts 54, 55 to de the ?nger 91 engages stop 59 and its rotation 05 energize the solenoid notwithstanding continued is initiated when the solenoid 52 is energized, i. e., engagement of the scale-contacts 59, 5|. The upon balance of the scale and cessation of the rotation of shaft 41 also moves the stop 99 out of dribble feed. The cycle of operation repeats so engagement with the finger 5'I pivotally mounted long as the motor 24 remains energized. The 70 upon the bracket 59 secured to shaft 69, so that time per cycle however, may not be constant but spring ?I swings the clutch member 92 attached may vary for diiferent cycles because the ini to or integral with ?nger 51 into the path of one tiation of each cycle is determined by the ma of the abutments 69 of the driving clutch member ' chine itself, i. e., when the proper weight is 94 which is constantly rotated by motor 24 received by the container R. With apparatus of through the sears 95, 66, (Fig. 3) SPI?OQKEEW 5''. the type shown the speed of thirty weighing 3 2,111,921 _ operations per minute is not di?icult to obtain, although speed will vary depending upon the character of the material, the accuracy desired, and the quantity to be weighed per cycle. Preferably and as indicated, there is a gap be tween the end of the conveyor 4 and the receiv ing end of the chute 2| which is jumped by the elements E of the mass due to their inertia. However, the broken pieces, chips, etc., being lighter, do not possess sufficient momentum and drop through the gap into a suitable waste re ceptacle H0. Therefore, the mechanism serves to clean the material at the same time that it is delivering it to be weighed. This is particularly of importance when the material weighed is hard 15 10 candies, for the broken pieces and powder often run to a substantial percentage. In some cases it may be desirable to modify the mechanism so that it will perform one cycle 20 of operations and then stop, the operator trip ping the machine to cause it to go through the next cycle. In this modi?cation, a portion of which is shown in Fig. 5, the clutch ?nger 51 is not controlled by shaft 41 but instead engages 25 the arm 56' connected through link III to the treadle H2. When the treadle is depressed the arm 51 is released and the machine goes through its cycle as above described and will repeat so long as the treadle is held depressed. If the 30 treadle is depressed only momentarily the ma chine stops at the end of one cycle. Where the degree of accuracy desired is not so high as to require the dribble feed, this at tachment may be dispensed with, and the main feed allowed to run continuously, i. e., the mech anism shown in Fig. 3 can be converted simply by removal of the latch 93, or of course a sprocket directly connected to shaft 98 may be substituted for the clutch members. With this modi?cation, 40 shown in Fig. 3a with sprocket IilIa directly con nected ?to shaft 98, the material will flow con tinuously off the, conveyor and will discharge into the container R. until the weight is su?icient to cause the scale beam to operate the solenoid 45 contacts allowing the brush G to descend. The mechanism then, as above described, e?'ects dis charge or the contents of the container, by open? ing door 4|; the door is subsequently reclosed and the cycle repeats upon lifting of brush G. 50 Because the main conveyor continues to run while the brush G is down, when the brushis next lifted there is at ?rst discharge of a con siderable accumulation, and thereafter the rate . of discharge is that of the conveyor belt. With the modi?cation shown in Figs. 6 and 7 the dribble feed is again dispensed with, and the main conveyor 4 is stopped each time the de sired weight is obtained. With this modi?cation the rate of discharge into the receptacle is con 60 stant, and is not for each weighing, ?rst sub stantially high, and thereafter at much lower 55 rate. The elements having the same purpose or construction as in the preceding modi?cations are identi?edby like reference characters. The 65 principal difference between this modification and those previously described is that the clutch controlling the rotation of shaft 98 is of the friction type and is directly controlled from the balanced scale rather than through shaft 60. 70 The drive for shaft 98 includes the sprocket ?Illa 75 rotatable withsprocket 10. The driven clutch member H4 is normally held out of engagement with the driving clutch member H5. One end of the bell crank lever H6, which is pivoted to the bracket II?! of the frame of the machine, is provided with rollers H8 which extend into the groove H9 of the driven clutch member, and to the other arm of the lever is pivoted the link I29 connecting to the arm I2I which is fastened to shaft 41. The operation of the modi?cation is believed clear in view of the preceding descrip tion. Brie?y, when the shaft 41 is released, as above described, the link I20 is moved to the left, as viewed in Fig. '7, to withdraw the driven clutch member I I4 from the driving clutch mem 10 ber H5 to stop feeding movement of the con veyor. Simultaneously, as above described, the brush G descends to stop the material which has left the belt and is in the chute. In Fig. 8 is shown another type of dribble feed 15 suitable for use with any of the arrangements previously described. The trough I20 which re ceives material from the conduit 2a of a hopper, or equivalent, is resiliently supported by the flex ible plates I2I for vibration by the solenoid or 20 electromagnet I22 energized by alternating or pulsating current. _ The shaking or vibration of the trough effects movement of the material toward the open or discharge end for delivery of a small stream of 25 material to chute 22 so that in general, it per forms the same function as the dribble feed device DF of preceding modi?cations. The rate of feed can be varied by adjustment of the ampli tude of vibration, for example the screw I 23 can 30 be manipulated to vary the air gap between the magnet I22 and its armature carried or formed by the central plate IN, the pointer I24 indicat ing the amplitude adjustment. Speci?cally, the electromagnet I22 may 'be adjusted angularly about a pivot to change the air gap. Preferably, the vibrating conveyor operates 50 long as tne weighing machine is in operation, for example, the solenoid I22 may be energized con currently with energization of motor 24. 40 In Figs. 8 and 9, there is also shown a modi? cation of the structure for directing the weighed amounts of material to the bags to be ?lled. In many instances the bags are ?at or collapsed and must be opened before they receive the Weighed 45 material. The speed of operation of the weigh ling device described is so high that it is prac tically impossible if the machine is running as a full-automatic device, for an operator to open the bags quickly enough to get them in position before door M is operated by the self-tripping mechanism of the machine. ?Cellophane? bags in particular are di??icult to open because the edges of the open end are flush and not pro vided with any offset or notch to facilitate their 56 separation for opening of the mouth of the bag. The blower I25, suitably driven as by motor I26, delivers a stream of air through duct I21 and pipe I28 to the funnel 42a which is provided with a plate I29 for directing the stream toward 60 the discharge end or nose I30. The amount of air issuing from the open or bag-receiving end of the nose I30 can be regu lated, as by varying the position of the by-pass damper I 3| having operating handle I32. 65 As soon as the operator positions a bag below the nose I30 by holding it loosely in substan tially upright position, the air blast immediately distends the bag for reception of material as soon as door 4I opens. With this attachment, 70 an operator can readily keep pace with the ma chine for there is ample time in the cycle for an operator to reach for a bag and move it beneath the nose I30. ' This arrangement for opening the bags may 75 4 -. 2,111,921 be used with any of the other preceding modifica shaft to one position, a latch restraining move tions of Figs. 1 to 7. - ment of said shaft by said biasing means, a mem In general, although I have illustrated pre ber connected to shaft and operable when said ferred forms of my automatic weighing appara shaft is in its restrained position to prevent tus, it is to be? understood that my invention is movement of said ?brush structure by its biasing not limited thereto but is co-extensive in scope means, a clutch comprising separable members, with the appended claims. a member on said shaft preventing, when said What I claim is: shaft is in said restrained position engagement 1. An automatic weighing machine compris of said clutch members, lost-motion means op 10 ing a scale, a conveyor for feeding material to erated by said clutch during engagement of said said scale, clutch mechanism operable when clutch members to move said shaft to its re 10 tripped to e?ect a predetermined movement of strained position and said brush structure away said? conveyor, structure movable toward and from its chute-damming position, and means re from scale-locking position, clutch mechanism sponsive to balance oi? said scale for releasing 15 operable when tripped to e?ect a predetermined said latch to permit movement oi? said shaft by movement during which it trips said ?rst clutch its biasing means to release said brush structure 16 mechanism, and ?rst moves said structure to for movement by its biasing means and to effect scale-locking position and then away from said engagement of said separable clutch members. position, and ineans responsive to balance of the 4. An automatic weighing machine suited for scale for tripping said second clutch mechanism. materials of widely diiierent characters, sizes and 2. A weighing machine including a scale hav ?_ shapes comprising a hopper for said material, a ing a receptacle for receiving solid material for revolving?disk below saidv hopper, a scale having weighing, conveyor means operative once for a receptacle, a door for said receptacle, a con each cycle of the machine to feed at high rate to veyor belt adjacent the edge of said disc to feed said receptacle for a ?xed time, means (or inter a stream of material therefrom toward said scale rupting operation oi.? said conveyor at the end of receptacle, brush structure movable to a position said ?xed time whereby the amount of material at which it dams said stream on said conveyor, progressively delivered to said receptacle and ac automatic means operative during its cycle to cumulated therein is insu?lcient to effect balance, open said door, to close said door, and in move continuously operating means for feeding mate-' said brush structure from said damming posi rial at low rate to said receptacle, and structure tion, and means responsive to balance of said disposed out of the path oi said material to said scale e?ecting movement oi? said brush structure receptacle during operation of said conveyor to said damming position and to initiate the cycle ' means and movable to obstruct said path in re of said automatic means, said automatic means sponse to balance of the scale. I including delayed-action mechanism providing ' 3. An automatic weighing machine comprising a scale, means .for feeding a stream oi.? material to said scale comprising a conveyor and an in for opening of said door, discharge of the recep tacle contents, and reciosure of said door while said brush structure is in damming position, and clined chute therefrom, brush structure, means for biasing said brush structure toward a posi tion at which it dams the stream at the discharge end of the chute, a shaft, means for biasing said for movement of- said brush structure from said damming position when said door is reclosed. EDGAR W. BLEAM.