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Патент USA US2111921

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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
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R
6 Sheets-Sheet 3
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Fla:5?0-4
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1?MP16?
11:12
INVENTOR.
BY
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'
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.
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