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Патент USA US2112621

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March 29, 1933- '_
2,1 12,621
R. o. HENSZEY ET AL
PROCESS OF AND APPARATUS FOR DETECTING SOLDER PELLETS IN CANS
Filed June .19, 1936
4 She'ets-Sheet 2
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March 29, 1938.
2,4 12,621
R. o. HENSZEY Er AL
PROCESS OF AND APPARATUS FOR DETECTING SOLDER PELLETS IN CANS
‘
Filed June 19, 1955
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March 29, 1938.
2,1 12,621
R. o. HENSZEY ET AL
PROCESS OF AND APPARATUS FOR DETECTING SOLDER ‘PEDLETS IN CANS
Fiiedw June .19, 1935
4 Sheets-Sheet 4
4/ ROY 0. HENSZE
PAUL 1504/2121;
QP5WW
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Patented Mar. 29, 1938 .
, "2,112,621
UNITED STATES
PATENIT o'FFicE
' 2,112,621
PROCESS OF AND APPARATUS FOR lIlE'l‘EGT
ING SOLDEB. PELLETS IN CANS
’
Boy 0. Henszey, Hans Buehler, and'l'aul Smart,
Oconomowoc, Wis., assignors to Carnation
Company, Oconomowoc, Win, a corporation of
Delaware
Application June 19, 1936, Serial No. 86,212
15 Claims.
Our invention relates to process of and appara
tus for detecting solder pellets in cans. The
process of our invention comprises bringing a
can into close proximity to a vibration sensitive
5 detector, moving the can in such manner that any
pellet contained therein is caused to strike the
can wall thereby ‘producing a. vibration of said
can wall capable of being detected, said vibration
sensitive detector with its associated apparatus
10 being responsive to the vibration produced by
said pellet but being relatively insensitive to ex
traneous ‘vibrations, then-transmitting the re
sponse of said detector, usually after ampli?ca
tion, .120 means for indicating the presence of any
15 pellet in said can and, if desired, transmitting said
response to means for automatically rejecting any
pellét~containing cans.v The apparatus of our
7
_ ‘
(01. 73-51)
pensive'and highly unreliable. ' Invariably a cer
tain proportion of cans are passed by the inspec
tors, which contain pellets. Owing tolthe high
viscosity of many food products, such as evap
orated milk, and the resulting ‘sluggish move; '
ment of any pellets-there is a de?nite lower lim
it of pelletsize which can be detected by the
hand method. It is impossible to detect the
smaller sized pellets and these, if anything, are
more objectionable than the-larger ones.
The present invention makes it'possible. to de- 4
tect pellets which are the size of pin points and
which make so little noise when the can is shaken
that any noise‘ produced thereby is inaudible to‘
the human ear. Our method can be made com
pletely automatic or may be operated to produce
a visual indication of the presence of pellets with
invention comprises a vibration sensitive receiver . manual removal of the cans containing such
or detector, means for conveying a pluralityv of pellets. The method can be operated with great
_
‘
s.
'
20 cans some of which contain solder pellets seriatim speed and precision. '
Broadly speaking our method comprises vibrat
in close proximity to said vibration sensitive deing a can in such fashion that any pellet contector, means for setting said cans into forced vi
bration while inv close proximity to said detector, tained therein is caused to strike a wall of the'
said forced vibration being capable 'of causing can thereby producing avibration or'noise which
25 any pellets to vibrate against the walls of said is capable of being detected automatically.
‘ cans thereby producing a vibration di?erent from . This vibration or noise is detected by a receiving
said forced vibration, said detector and associated - means which is advantageously tuned- in such
apparatus beingv responsive to said di?erent vi
manner that it is sensitive to the vibration pro
_ bration but relatively insensitive to said forced
30 vibration, and means for transforming any re
sponse of said detector to said di?erent vibration
duced bythe pellets striking'the can wall but is
relatively insensitive to extraneous noises, such
into mechanical action capable of indicating the
pr'esence'of any pellet and, if ‘desired, automati
cally rejecting any cans containing pellets; all
iwhichis applied to the can. The impulsewhich
isireceived is then ampli?ed, usually ‘electrically, ‘
and this ampli?ed impulse is employed to produce
as
.
a- visual indication of the presence of any pellets’
or to set in motion mechanical elements which’
In the canning of evaporated milk and other
v are capable of automatically discarding‘- any cans ‘ -
35 as more fully hereinafter set forth and as
claimed.
v
as the splashing of the milk and the vibration
which contain pellets. ‘The vibration applied to
the can is usually a simple shaking produced by
40 sealed by placing a drop of solder in the vent- _ a quick dropping of the can'and the receiver may
holeand allowing it to harden there. It is dif- be any noise or vibration sensitive device such as
,?cult to prevent the solder from dropping a telephone receiver, microphone or the like. We
through the vent-hole into thecan and this have found it‘ particularly advantageous to vi
brate the can while in a magnetic ?eld and in
method invariably results in the inclusion of sol
liquids it is common to employ the so-called
“vent-hole can”. This can, after being ?lled, is
45 der pellets in at ‘least a small proportion of
the cans. The presence 01', these pellets in cans
containing- foodstu?‘s is highly objectionable.
The present invention comprises an ‘automatic
‘ method for'detecting andldiscarding cans con__-,0 taining such pellets.
_
'
I
_ It has, formerly been the practice to detect
pellets in cans by shaking the sealed cans close
to the ear and listening for the slight click or
noise produced by the pellet striking the wall of
55 the can. _This hand process is,‘ of course, ex
such a position that a magnetic ?ux passes 45
through the can wall, the variations in ?ux pro
duced ‘by/the pellet vibration'being then detected .
by the corresponding variations in an ' electric
current induced'thereby.
-
-
>
.
_
Our invention can be explained more speci?
cally by reference to the accompanying drawings
which show an assembly of apparatus elements
within the purview of our invention and suscept
ible of use in our process.
In this showing: \
Fig. l is a vertical section through a machine '
8,119,081
matlcally gripped at conveyor 83 by the claw grips
capable of operating automatically to discard
II and are automatically released at conveyor
34. The claw grips are formed in two parts (see,
cans containing pellets, the section being taken
along the line l-l of Fig. 2,
Fig. 6) one maybe termed the hand part It being _
Fig. 2 is a plan view of the machine with certain I
integral with the carrier arm 9 while the ‘other ?n- I
parts removed,
ger part It is pivoted at 31 tothe carrier arm. The
Fig. 3 is a vertical section through the machine
pivoted part," is provided with a ?nger It having
along the line 8-3 of Fig. 2,
.
Fig. 4 is a plan view of the cam which assists
in producing vibration of the
at its end a tapered raised cam portion 39 with a
beveled edge. The ?ngers it serve as cam fol
lowers, cooperating with cams i8 and H to op-‘ 10
erate the claw grips, as shown in Fig. 2. The
carrier arms 9 are provided with bosses 40 which
-
Fig. 5 is a side elevation of the cam of Fig. 4,
10
Fig. 6 is a perspective view of the hinged car
’ rier arms which support the cans before and after
testing,
.
act as a stop for ?ngers 3|. These‘?ngers are
normally held in closed or gripping position by
.
_ Fig. 7 is a perspective view of the mechanism ,
means‘of springs II which tend to press the ?n 15
gers 38 against the'bosses 40, as will be clear from
Fig. 6. The springs, II are supported by and act
between raised portions 42 on hand part 3! and
15 attached to a solenoid whichysvhen operated,‘
serves to automatically discard cans containing
. pellets,
.
'
Fig. 8 is a view of a switch which re-sets the
solenoid mechanismaiter the discarding of a can, raised portions 39 on ?ngers 38. The inner faces
oi’ the claw grips are provided with rubber lin 20
20~ ' Fig. 9 is an enlarged sectional view of the vibra ' ings
43 which provide a positive gripping action
tion detector, with parts in elevation,
_
Fig. 10 is a diagram of electrical connections and reduce the severity of extraneous vibration
carried to the can through the claw grip.
vwhich can be employed for detecting and ampli
It is generally advantageous to provide means
fying the impulse received by the detector and for
operating the solenoid as a result of said impulse, » whereby the carrier arms are forced to drop of! 25
while-
.
‘
'
the cam portions 25 and 20 with a velocity higher
‘
than that produced by gravity alone. The pellets.
Fig. 11 shows-a modi?ed method of vibrating
the cansasthey are being tested. I
36
v
as
'
- tend to fall at the rate which would be ‘produced
In the various figures, like parts are represented
by like reference numerals. Our machine is
mounted on a pedestal base I which supports a
fixed vertical shaft 2. A gear housing I is sup
wall. When the downward motion of the can is 30
thensuddenly arrested by the springs 21 and It, ,
any pellet is caused to strike the can wall sharply.
ported by the vertical shaft and this provides a
mounting for a motor, not shown,‘ and driving
This forced dropping of the cans may be produced
by the springs M and 45; see Fig. 2. These
worm 4, mounted on the motor shaft 5. The worm
gear I meshes with a gear ‘which is secured to a
springs are mounted on cap ll by means of arms 35
46 and 41, respectively. Spring 44 normally bears .
sleeve 1 journaled on shaft 2. vA turret I is bolted
to sleeve 1 and journaled on shaft 2, this turret
on the top of the cans, as shown in Fig. 3 while
spring 45 bears on the carrier arms ,9, as shown
serving to support and rotate a series of carrier
in'Fls. 1.
6), which are pivoted at II to
40 arms 0. (see
brackets “bolted to said turret. . The, carrier
arms bear upon the fixed annular cam II which is
supported by brackets "l3 mounted on gear hous
ing3;seeFigs.1,4and5.
45
by gravity and thus become spaced from the can
,
.
The detector, indicated generally at 48 in Figs.
1 and 9, is adJustably mounted on arm 49, which‘
is secured to housing 3 at the testing station im
mediately below the second drop produced by camv
section 28. The detector is adjusted‘ in height so
ameter anda?xedeap ilissecuredtothisby
that the cans, at the lowest point of their second 45
drop, are immediately above the detector, as
means of set screw II. This cap is provided with‘
shown in Fig. 9.
The top of the vertical shaft {is reduced in di
?at sides to which are secured bracket it, which
supportsthe solenoid i1, and two cams II and I.
(see Figs. 1 and 2) which serve to operate the
claw grip ll which holds and carries the cans II.
The cap i4 is provided with a counter bore 22 at
its lower end which provides. room for the ball
.‘
.
We have found it advantageous tov employ a
detector very similartothe ordinary telephonev '
receiver. We have found, however, that. greater 50
sensitivity and selectivity: are secured provided
the soft iron disc found in the usual telephone re
ceiver is ‘removed. The can bottom 50 then takes '
bearingrace? whichissecuredtotheturretl
the place of this soft iron discand variations in
by means of the clamp ring 24.
'
. As shownin Fig. 5, the cam llis provided with
the ‘distance of the can bottom from the perma
nent magnetJl (Fig. 9) produce corresponding
two vertical sections II and It forming one side - v variations in magnetic flux which in turn induce
of pockets 2! and 3.. ‘As the carrier arms 0 pass
along the cam from right to left in Fig. 5 a sharp
drop is produced atthese two ‘points. The arms
strike the springs 21 and 28, the ends of which are. '
positioned in pockets 2! and ti, respectively, (see
currents in the'magnet‘coils'?. The path ofthe
?ux through the can bottom is indicated by dotted
linesandarrows inl'igs.9and 10. .l-
.
The detector shown in Fig. 9 is insensitive to
noises at all times ‘when the can bottom is- re
Figs. 3 and 5) and the cans which are held by movedfrom its immediate vicinity. Moreover the
{these arms thus receive a-sudden Jolt or vibration ' can bottom itself is-relatively-insensitive to ex-_
at these two points. The ?rst drop serves to ac
traneous noises originating outside the ‘can. But
,
65
cm-atelyposition any pellets ‘It in the cans while . them of a pellet on. the, can bottom di
vthe second drop causes the pellet to strike ,the
can wall thereby producing a vibration‘ or noise
1
vibrates the‘ same and this vibration is di
_ I transformed into the desired electrical im
which is detected in a manner to be described. pulse.‘ This avoids the loss of energy-which would
"The springs 21 and‘ ?'aremounted on brackets‘ _ result' from the indirectmethod of producingi’lo
81' and 84’, respectively whichinturn are secured ., sound waves in the air, followed by reception of
tothe gear housing 3.
-
-
-
_
"
-Rei'erringtoFig.2,thecanstobetestedare
is
fed to the machine by means of conveyor 33 and
removed by conveyor M. The cans are auto
_ these sound waves ‘and
The
tbeirsurro
to elec
_ t magnet. ii and coils 52, with
metal'ca'se I‘, are mounted in
' 3
2,112,621
a rubber packing 53, this packing being secured
e 88 on claw grips 28.. This causes the claw grips Q
between the two metal halves 54 and 55, shown in
to release the cans and the‘ cans drop by gravity
‘ Fig. 9.
Electrical connection to coils 52 are made
by means of binding-posts 51 which pass through
insulating bushings 58, as will be clear from the
showing of Fig. 9.
'
'
We have also illustrated in the drawing a means
10
- can at the testing station contains a pellet.
The '
switch 64 which is mounted on rocker arm 5|
for automatically discarding, ' cans containing
drops down- in the path of cam portions 39 of
pellets, this means being operated by an electrical
?ngers 38 only when a pellet has been detected. ‘
receiving and controlling means, the wiring‘ dia
gram of which is shown in Fig. 10. The dis-\
carding means comprises the solenoid I‘! (Fig. 1)
with connecting rod 59, pivoted to its plunger.
The solenoid bracket I6 is provided with horizon
15 tal arms 60 (see Fig. 7) in the ends of which is
pivoted a bifurcated rocker arm 6| which is piv
oted at one end 82 to connecting rod 59. A cam
roller 63 is secured to the other end of rocker arm
6| in the manner shown in‘ Fig. 7. It will be evi
20 dent from this showing that, when connecting rod
59 is raised by actuation of the solenoid, the cam
roller 63 will be lowered. In its normal position,
shown in Fig. 1, the cam roller 63 is raised above
part 39 of the ?ngers '38 of claw grip 20. But
25 when the solenoid is actuated the disc drops into‘v
the path of the claw ?ngers and operates to open
the claw grips as the carrier arms move past; see
Fig. 2.
And as soon as the switch 64 has been opened the
solenoid is restored to ,its inoperative position and
the rocker arm 6| lifts the switch 64 out of the _
path of the cam portions 33.
After the " electronic trip is energized by the
electrical impulse. produced upon the detection of 15
a pellet in a can, it automatically restores itself
to zero current due to the voltage drop- in its
cathode resistor when it is tripped.
Thus the re* _
jecting apparatus shown in the drawing is fully
.automatic.
We may use other methods also.
'
20
The description of the operation of our'pellet
testing and can discarding device may be sum
marized as follows: A series of cans are fed into
the machine by means of conveyor 33. At this
point, during the rotationof the turret or turn
table 8, the claw grips 20 are opened by operation
of cam l9. These claw grips grasp the individual
cans and carry them clockwise around the turn
.
The electric switch, indicated generally at 54
30 (see Figs. 2, 8 and 10) is mounted on a block of
insulation 65 on‘ the end of rockerarm 6!. This
spring, as will be evident from Fig. 8, is normally
held in closed position by the spring action of the
upper leaf 66 but is opened, after excitation of
the solenoid, by the cam portions 39 on ?ngers
38 of claw grips 20, after the cams have left the .
testing station. This switch 64 has the purpose of
restoring the solenoid to its normal or inoperative
position after the discarding of a can containing
a pellet, as will be‘ described later.
The wiring diagram of a suitable receiver and
controller for operating our‘ device is shown in‘
Fig. 10. At'the left in this ?gure is shown the
detector 48 with wiring connections to the coils
52,}one end being grounded at 51. The wiring
connections are believed to be clear ‘from the
legends in Fig. 10.
Many suitable wiring diagrams for our receiver
can be developed. It is only necessary that the
50 receiver amplify the impulse received from the
detector and employ this ampli?ed impulse to op
erate the hold-in relay' 68. A sensitive relay 69
is usually employed, this being operated by the
Ca Cl
and are thereafter discarded. It is,_of course,
evident from the preceding description that the
solenoid I1 is caused to operate only when the
table, as ‘indicated by the arrow in Fig. 2. Along
the section line 3—3 of Fig. 2 the pivoted ‘carrier 30
arms 9, which are supported by cam 12 (see Fig.
5) drop into pocket 29 and the cans are given a
sudden jolt and are tilted slightly. This jolt "
serves to loosen any‘ pellet ‘l6 and to tumble it
into the lowest point of the can, thereby de?nitely
localizing its position. _The carrier arms are .then
raised by the beveled portion 3! of cam I2. As
the cans reach the testing station directly above
the detector 48 (see Fig. 2), the carrier arms drop
into pocket 30 of cam l2 (see Fig. 5) and strike
the spring 28. The cans, at their lowest position,
almost touch the detector 48 and any pellets con
tained therein are caused to strike the bottom of
the cans while the cans are in this position.
If a pellet is present in the can being tested,
this pellet is caused to strike the can wall ‘pro
ducing a ‘vibration in the can bottom which
causes a variation in the ?ux through the perma
nent magnet 5| and a corresponding electrical,v
impulse in coils 52. This electrical impulse is
ampli?ed by the vacuum tubes shown in Fig. 10
su?iciently to actuate the‘relay 69. Relay 69 in
turn actuates the hold-in relay 68, which upon
current from a gas ?lled tube ‘II! which acts as an I closure, energizes the solenoid l1. Operation of
the solenoid raises the connecting link 59 causing
electronic trip. This trip 10 is generally con
nected in the circuit after one or more stages of
ampli?cation, as shown in Fig. 10. We have
found that an electronic trip is superior to an
electro-mechanical trip, because the voltage of
60 tripping may be adjusted and, is then constant,
and because the trip is caused by instantaneous
peak voltage rather than by some function of
voltage and time; This is particularly important
' in the present invention since the pellet sound is
65 extremely, short in duration owing to the damping
action of the milk.
Interfering noises are usually
more sustained in length.
.
’
When the electronic trip ‘Ill is operated it ener
gizes the sensitive relay 59 which in turn oper
ates hold-in relay488. This r'elay.energizes the
solenoid H (see also Fig. 1) ‘and the solenoid re-'
mains energized imtil electric circuit of relay 68 is
broken by opening of switch 84. As described
previously, energization of solenoid l'l causes the
75 - cam roller 63 to drop in position to operate ?ngers
the cam disc 63 to drop into a position to contact
part 39, the cam portion of ?nger 38 on claw grip
20. And, as the rotation of the turret carries the
pellet-containing can past the cam disc 63, the
claw is opened and the can drops by gravity or 60
it may be pushed from the ‘claw. The can is
thus automatically discarded at the discarding '
station.
Soon after this operation the switch 64
(Fig. 8) is opened.‘ This breaks the circuit of the
hold-in relay 68 which opens thereby breaking
the electrical circuit to the solenoid II. The
connecting link- 59 drops and the cam roller 63
and switch 64 are raised to their normal or in
operative position justbefore the next succeeding
can reaches the testing station.
-
_
If the tested can does not contain a pellet the
sudden drop of the can at the testing station
produces only‘ those electrical impulses in the
detector coils towards which the receiver and as
sociated apparatus is relatively insensitive. The 15
_4-
'>
-
‘
3,112,091
relay ll is'not operated and the solenoid l'l, cam
disc I! and switch it remain in their inoperative
positions. The pellet-free can is therefore car
ried past the discarding'station and is finally
5 released from the claw grip 20 by operation of
,
a
trated we have found it possible to test-cans at
10 the rate of up to 135 per minute. Pellets as small
as pin points have been detected. Both of these
results were impossible prior to the present in
vention.
‘
-
'
_
_
~
.
While we have described what we consider to
is be an excellent and practical embodiment of our
tional microphone may be employed as a detec
tor in our; invention and the‘pulsating micro‘- >5
radio art. The ampli?ed current can be em
ployed in such manner that 'in e?ect the noise }.
of the bounding ‘pellet is merely ‘ampli?ed. It l0v
is
called
also possible
condenser
to\employ
,microphone
the principle
in making
of the
a de
tector.
'
'.
_
'
,
r
_
\ The ampli?er shown is sensitive to high audio
frequencies while being relatively insensitive to is
low frequencies, this, being accomplished by
‘ modi?cations can be made within the skill of the
choice at constants in the'coupling circuits ‘of,
the ampli?er.‘ The sameresult can‘be accom-'
a vibration in‘ said wall which ‘is capable of being '
detected and diiferentiated from the forced v11
25 brationh The pellet-produced vibration or the
resultant vibration of the can wall may differ
from the forced-vibration by a di?erence in pitch.
a di?erencein quality or a difference in amDli-_
-
.
invention it is immediately obvious that many
art which fall within the purview of our inven-'
tion.” Our method depends upon the application
20 of a forced vibration to the cans to be tested, this
vibration being of a type causing the‘pellet to
bounce and to strike the ‘can wall, thus producing
'
.
As has been‘ indicated previously, a conven
pellet can beampli?edbymeans familiarinthe ‘, '
-
By means of the machine described and illus
'
pellets in various .ways.
current'resulting from the noise produced by the
cam II. The can then leaves the machine
means of the conveyor 34.
It isalso possible to mark the cans containing
tude;. the only requisite being that this differ
80 _ ence is capable of being detected. --
_
With the apparatus shown in; our drawings in
which the pellet impact is caused by sudden ar
resting of the downward motion of the can, the
frequency of the vibration caused by the pellet
to impact is a rather high‘audio frequency. The
extraneous vibration caused by‘such~ things -as
the splashing of the contents of the can, the op
_
Resonant
plished, ofcircuits
course,by'
may
other
be used
well-known
with ormethods. Lso .
a beat frequency oscillator. 1
. The tube ‘II in Fig. 10 ,is so connected that it
carries a heavy current .for a short time after
any peak signal voltage higher .than a naked value _
is applied to its/grid. Relay 8! is operated by 26
this tube. Tube 10 and relay 69 may also repre
sent deviceswhich are designed to‘ operate at a
’ certain value of a function of voltage and
tion of voltage.
'
_
p -
. In a modi?cation of this invention relay II may 80
represent a time lag relaywhichioperates to en-.
ergize the solenoid I] for 'a de?nite shorttime in-,
terviii, this interval corre nding to the time
required for a can to traverse the distance from
the testing station to the
station.
as
The presentinvention is applicable to problems“ “
other than that of detecting solder pellets in tin
eration of the machine,.?oor vibrations,. and ~ cans.v It is generally applicable for the detec
sound waves, are su?iciently lower in frequency’ tion of solid bodies in containers holding ?uids
' so to be adequately eliminated from. the ampli?er provided the‘ said solid bodies are' of di?erent 4o.'_
‘ output'by selective'ampli?cation.
speci?c gravity than {the said ?uids and the ma
‘
In Fig. 11 there is shown an- optional method
of causing vibration of the cans for testing pur
poses. In this showing thecan II is given a
45 chattering motion by means of two electromag
nets '9 and ‘II energized by two separate coils
‘II and ‘II, respectively.
terial of the container is such that a vibration‘ ,
capable of being detected is produced upon‘ the ,
striking'of the container walls with said- solid
bodies. Cardboard and wooden containers are,“
examples 'of containers which
within the
The electric circuits of ' present invention.
coils ll and 12 may be such that the current
in one circuit lags behind that in ‘the other by
so about half a cycle. In this case the electromag
_ netswiil be energized alternately and a chatter‘
ing motion of can II will be produced. It is de
sirable to have the cans rest upon rubber strips
‘ii and ‘I4 and a rubber pad ‘II mayjbe employed
' :
Other commercial applications ‘and methods
‘of operating the process of the present inven- i
tion, which fall within the scope of the following so 1'
claims, will immediately occur to those skilled in
the art,‘
~ _.
'-
i
“What we claim is:
’
.
1. An apparatus for detecting the presence of ~ >
as at the top to prevent actual contact of thef'can .solid bodies in containers holding ?uids, compris- .5;
ing a vibration sensitive detector, means for con
'_ with the iron magnets. The detector ll em
ployed in this embodiment may be of the same tinuously moving a container past and into close
'proximity to said detector, means mi- moving "
type as that shownin the other ?gures. ’
The method of detecting the diiference
vl-‘ said container-"bodily while )in such position in.
I do bration of the can bottom caused by the presence v such manner as to cause any solidbody contained ‘w i
'
of a pellet may, of course, vary widely, It is - therein to strike a wall of said container thereby
'
pomble to detect this, diiference mechanically
producing a vibration of, said wall, and means for
or electrically or by a combination of these meth ' converting the ‘resulting response of said detector
' ods. When the diiference isdetected electrically into mechanical action to indicate thepresence
1
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..
,
.u
65 it is immediately evident that a wide selection of ofanysuchsolidjbody.
'2. An apparatus for detecting the presence of I‘
' ,. detecting and amplifying methods are available.‘
That ‘illustrated in the drawings is only one of
solid bodies'in containers holding ‘?uids, compris-_ . 3
ing a vibration sensitive detector, means for con
tinuously'moving'a container-past and into close. .
i, ‘It is possible, 0!
to mine "1.; ss'in' proximity to said detector, means for: applying 70
‘79 Fig. l0byanyoftheusualindicatingdevices.' m. a forced vibration to said container while in such
thiscaseourmethodmaybemanualinsofar proximity of such ‘type that 941! 3011.6. body there
' asthediscardingof the'pellet-containingcansis
,in‘is caused to strike it'wall of said container
concerned'while being electrical and mechanical
" "in sosfar as detection
pellets is concerned.
thereby ‘producing a resultant vibration diiier- I
eat from said forcedvvibration, said detector be 75
1
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.
.
v
V
'5
2,112,821
ing sensitive to said different vibration but rela
tively insensitive to said forced vibration, and
means for transforming any response to said de
tector into mechanical action capable of indicat
ing the presence of any solid ‘body in‘said con
tainer.
,
.
3. An apparatus for detecting solder pellets
in cans containing ?uids, which comprises a
‘vibration sensitive detector, means for continu
10 ously passing a plurality of cans seriatim in a
means for picking up the resulting vibration of
said can walls and for designating which cans
contain pellets, and means for ‘releasing the cans
from ‘the grippers before the grippers reach said
point at which they are operated to receive cans.
8. In the process of detecting solid bodies in
containers, the steps which comprise passing a
container along a predetermined path, passing in
proximity to a vibration sensitive detector, tip
ping and shaking said'container at one point in' 10'
said path in order to de?nitely position any solid
path leading in close proximity to a said vibration
sensitive detector, means for applying a forced» . bodies ‘in said container, then vibrating said con
vibration to said cans ‘while within the ?eld of tainer while in motion along said path in such
manner-that any so positioned solid bodies are
and while moving past said detector, said vibra
15 tion being 'of a type causing any pellets con
tained in said cans to strike the walls of said
cans thereby producing a vibration di?ering from
said forced vibration, means for selectively am
plifying the response to said detector to said dif
20 ferent vibration and means for converting said
ampli?ed response into mechanical action capa
ble of designating any cans containing pellets.
4. An apparatus for detecting solder pellets in
cans, which comprises a vibration sensitive de
caused to strike the wall of said container while 15
in immediate proximity to said detector, said de
tector being responsive to said vibration, ‘and
‘converting any response of said detector into
mechanical action adapted to indicate the pres
ence of any such solid bodies. '
9. An apparatus for detecting the presence of
solid bodies in containers, comprising a detector,
a predetermined path intersecting the ?eld of
means for positioning a container in close prox
imity to said detector and for moving said con-,
tainer in such manner that any solid body con 25
tained therein is caused to ‘strike a wall of said
said detector, means for applying a forced vibra
tion to said cans while in the ?eld of said de
container while within proximity to Said detec~
tor, thereby producing a vibration of said con
25 tector, means for moving a series of cans along
tector, said vibration being of su?icient intensity tainer wall, means for selectively amplifying any
30 to cause any pellets in said cans to strike the
high audio frequency component of said vibra
30.
can walls, ‘means for amplifying any high audio
tion- picked up by said detector and means ac'-_
frequency response of said detector and means
tuated in response to said ampli?ed vibration for '
indicating the presence of any solid body in said .
for employing said ampli?ed response for actu
ating means for removing any pellet-containing
35 cans from said predetermined path.
5. An apparatus for detecting solder pellets in
metal cans, which comprises means for moving
a plurality of cans seriatim along a path, means
for applying a forced vibration to said cans at
40 a predetermined point in said path, said vibra
tion being of suiiicient intensity to cause any
pellets contained in said cans to strike the walls
of said cans thereby producing a vibration di?er
ent from said forced vibration, means for passing
45 a magnetic ?ux through‘the walls of said cans
‘' when at said predetermined point, means for
transforming variations in said magnetic ?ux
produced by said di?erent vibration into an elec
container.
.
10. An apparatus for detecting the presence of 35
solid bodies in metal containers, comprising elec
trical means for producing a magnetic ?ux,
means for positioning such a container in such‘
proximity to said electrical means that said
magnetic ?ux will pass through .a wall of said 40
container, means for vibrating the so~positioned
container in such fashion that any solid body
contained therein is caused to strike said wall
thereby producing a vibration of said wall, and
means responsive to the resulting variations in 45
said magnetic flux for indicating the presence
of any solid bodies in said container.
11. An apparatus for detecting the presence of
tric current, means for amplifying said electric ' solid bodies in containers, comprising means for
-50
current and means actuated by said electric cur
continuously moving a container ‘at a substan
rent for removing any pellet-containing cans
from said path.
tially constant velocity along a predetermined
‘ 6. An apparatus for detecting solder pellets
in cans which comprises a vibration sensitive de
55 tector, means for passing a plurality of cans
path, means for vibrating said container at a
predetermined point in said path without sub
stantially disturbing said continuous motion
along said path, said vibration being in a direc
55
along a predetermined path seriatim, said path
tion substantially at right angles to the direc
entering the ?eld of said detector, means for
causing said cans to drop abruptly and for sud
denly arresting said'drop while said cans are
of causing any solid body in said container to
strike a’ container wall thereby producing a re
within said ?eld, thereby causing any pellets in
sultant vibration different from the vibration 60
said cans to strike the can walls, means for am—
plifying any response of said detector to the vi,
bration resulting from the striking of ' said can
walls and for converting said ampli?ed response
65 into mechanical action capable of designating
any cans which contain pellets.
7. An apparatus for detecting solder pellets in
‘ cans, which comprises a plurality of grippers,
means for moving said grippers in a closed path,
tion of-said continuous ‘motion and being capable .
produced in the absence of a solid body, a de
tector for picking up any/such resultant vibra
tion and means forv converting any response of
said‘ detector to said resultant vibration into
mechanical action capable of indicating the 65
presence of any solid body in said container.
12. An apparatus for detecting the presence of _
solid bodies in containers, comprising a vibra
tion-sensitive detector, means for passing a plu
rality of containers seriatim along ‘a predeter
mined path- passing in close proximity to said de
operating said grippers to receive said cans at tector, means for suddenly vibrating said con
v‘ said point, means for producing a vibration of‘the ' tainers while 'in motion along said path and
means for presenting a series of cans to said grip
.70 pers at a point in said closed path, means for
gripped cans in such fashion as to cause any _ while in proximity to said detector, said vibra
pellets contained therein to strike the can walls,
tion being capable oi.’ causing any solid. bodies'in
a
9,119,631
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_
‘said containers to-strike the walls 6': said- con-s vfor presenting a plurality of containers to'said
grippers scriatim at one point in; said- path,
of said walls, meansfor amplifying any
~
of said detector to said resultant vibration an
means for operating said grippers to receive said '\
comprises means for dropping and quickly a.r-,v
vibrations, means for amplifying any responses of 10 '
containers at said ‘point. means for vibrating ,~
means actuated by said ampli?ed response for - the gripped containers while in immediate‘ prox
indicating the presence of any solid bodiesin any‘ imity' to said detector-‘at a second point in said
closed path, in. such manner that any solid
.of said containers..
._13.- The'apparatus of claim'12 wherein said bodies contained therein are caused to strike
means for ‘suddenly- vibrating said containers the container walls thereby setting up resultant
10
said detector to said resultant vibrations, means ,
resting said containers.
14'. The apparatus of‘ claim 12 wherein said actuated-by said ampli?ed responses for releas- predetermined path is the arc of a circle lying ing any containers holding solid bodies at a third”
in a ‘substantially horizontal plane.
15
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15. An apparatus for detecting the presence of
solid bodies in container, comprising a vibration
sensitive detector and a plurality of grippers,‘
means for passing said‘grippers through a closed
. path passing in proximity to said detector, means , 1
point in said closed path and means for releasing» ‘
containers free from solid bodies at a fourth 1s
point'in said closed- path.
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ROY 0. HENSZEY.
HANS BUEHLER.
PAUL SMART.
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