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'Dec. 3, 1946. ‘
-|. w. ENGLAND EI'QAL
2,41 1,991
APPARATUS FOR INTERIORLY INSPECTING OPAQUB CONTAINERS
Filed July 24, 1941
6 Sheets-Sheet 4
Dec. 3, 1946.
I. w. ENGLAND Em
2,411,991
APPARATUS FOR INTERIORLY INSPECTING‘OPAQUE CONTAINERS
‘Filed July 24, 1941
_
6 Sheets-Sheet 5
12.27. 5’
98
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IM'ENTORS
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Dec- 3, 1945-
|. w. ENGLAND ET‘AL
2,411,991
APPARATUS FOR INTERIORLY INSPECTVING OPAQUE CONTAINERS
Filed July 24, 1941‘
6 Sheets-Sheet 6
INVENTORS
'
W791;
BY
~
W
12,411,991
Patented Dec. 3, 1946
UNITED STATES PATENT OFFICE ~
2,411,991
APPARATUS FOR INTERIORLY INSPECTING
' ,
OPAQUE CONTAINERS.
Isaac W. England, Passaic, h'l. J., and‘ William- F.
Punte, Syracuse, N. Y., assignors to Continental
Can Company, Inc., New York, N. Y., a corpo
ration of New York
Application July 24, 1941, Serial No. 403,912
16 Claims. (Cl. 88-44:)v
1
.
>
2
The invention relates generally to inspection
apparatus and primarily seeks to provide a novel
Figure 1 is a side elevation illustrating an ap
In the drawings:
'
_
apparatus which will enable an operative to rap-
paratus embodying the invention, parts being
idly and efficiently inspect, by sight, the interiors
broken away.
of opaque containers in order to insure against
the ?lling with food products or beverages any
containers which might have bits of debris or
container inspecting apparatus, the container
feedway being illustrated in vertical .cross section.
foreign matter therein.
Figure 2 is an end elevation illustrating ‘the
Figure 3 is a vertical cross section taken
‘
In its more detailed nature the invention re
sides in providing a sight inspection apparatus
of the nature stated wherein is embodied a sight
ing station, means for feeding containers to and
from said station, means for holding each con
.tainer thus fed for an inspecting interval at said
station, means for hooding or shielding the eyes
of an operative from outside light, means at the
sighting station for projecting light into the open
top of each container held at the sighting station,
and means through which an operative at said
through the center of the apparatus at the in
spection station.
n
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-
Figure 4 is a horizontal section taken on the
line 4-4 on Figure 3.
'
'
Figure 5 is a detail plan view illustrating the
' adjustable shutter.
Figure 6 is a vertical cross section of the shutter
taken on the line 6—6 on Figure 5, a fragment
of the shutter supporting shelf also being shown.
Figure '7 is a fragmentary ‘side elevation illus
trating one form of chain belt driving means.
In the apparatus herein disclosed as an exam
ple of embodiment of the invention there is in
cluded a continuously travelling chain belt 5 or
An object of‘the invention is to provide a novel
equivalent conveyor structure for moving the con
means for projecting the interior illuminating
tainers to be inspected in a line after the fashion
light into each container through the same top
opening therein through which the sight inspec 25 customary and well known in the container man
sighting station can directly inspect the interior
of each said container through said open top.
tion thereof is made.
ufacturing industry. The containers conveyed in
-
a line by the belt 5 are designated 6 and the belt
Another object of the invention is to provide
passes over guides ‘I along a suitable frame struc
novel means for illuminating the interiors of the
containers in a particularly efficient manner, and ‘ ture, in this instance constituting a box framing
means for considerably magnifying the illumi 30 8 including longitudinal corner angle irons 9.
To one of .the upper angle irons 9 is attached
nated interior of each container as it is inspected
an extension angle or shelf ill on which is sup
by the eyes of the operative.
ported a timing screw housing Ii. The housing
Another object of the invention is to provide
ii is open, as at I2, at the side thereof disposed
an apparatus of the character stated including a
novel shutter structure effective to shield the eyes 35 toward the conveyor belt 5 and is equipped with
bearings i3 for rotatably supporting the trun
of the operative from light ray re?ections from
nions I4 at the ends of the timing screw i5.- The
container parts other than the interiors thereof
spiral thread on the timing screw intercepts the
as the containers are being moved to and from
containers 6 vbeing moved in line on the belt 5 and
.the sighting station.
Another object of the invention is to provide an 40 serves to time the movement thereof toward the
inspecting station and to space the moving con
apparatus of the character stated in which the
container feeding means includes a continuously
tainers and present them one'by one at said sta
moving belt chain or similar conveyor, and a
tion.
timing screw for spacing the containers along
It is intended that each container should come
the travelling chain belt as they approach the
to rest for a suitable inspecting interval at the
sighting ‘station, said screw including an annular
inspection station, and for this purpose the tim
dwell groove portion effective to temporarily hold
ing screw is equipped with an annular dwell
individual containers to be inspected at the sight
groove i6. As each container moves into the dwell
ing station.
_
With the above and other objects in view that 50 groove It it is held thereby for the, inspection.
interval mentioned. At its delivery end the screw
will hereinafter appear, the nature of the inven
is-equipped with a clearance I1, and each time
tion will be more fully understood by following
this clearance is turned into opposition to the
thedetailed description, the appended claims, and
container feedway it releases the container which
the several views illustrated in the accompanying
drawings.
‘
55 has been held at the inspection station and the
2,411,991
3
inspection of which has been completed, and per
mits the belt to take it away.
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.
Y
4
.
The light from each lamp 51 is projected through
a condensing lens set 6| adjustably mounted, as
at 62, on the respective block 59 through an in
dividual arcuate opening 63 formed in the base
driven by a bevel gear l9 mounted on a stub shaft 5 56 and into the bottoms of the containers serially
28 rotatable in a bearing 2| provided therefor in
presented at the inspection station. The lamps
the ‘housing II, and the stub shaft 28 is driven
51 are supplied with electrical current from a
by sprocket and chain connections 22 from any
suitable source (not shown) vthrough transform
suitable source of power (not shown). It is to be ,
ers 64 which are disposed outside the housing 48
understood that the belt 5 travels rapidly relative 10 in a separate housing 65.
to the pitch and speed of rotation of the timing
The light projected from the lamps 51 into
screw |5 so that the screw serves a spacing and
the bottoms of the containers 6 is not projected
timing function rather than a feeding function
directly into said containers but passes through
as will be obvious by reference to Figure 4 of the
.the condensing lenses GI and is re?ected there~
The screw trunnion at the receiving end of the
screw is equipped with a bevel gear l8 which is
drawings.
’
- Opposed to the receiving end of the screw l5,
there is mounted a bracket 23 equipped with
fixed container travel-way de?ning wall portions
15 into by individual mirrors 66 supported at the
proper angle, as at 61, about a lens 68 centered
over the axis of a container presented at the in
spection station and in a center aperture 69
24. The bracket 23 also carries a yieldable wall
formed in the base 56.
25 which is pivoted about a vertical axis, as at 20
The lens 68 is carried at the bottom end of a
26, on said bracket and is constantly urged to
sighting cone 18 supported at its upper end in
ward the travelling containers by a bell crank
an aperture in a ring or top plate 1| forming the
arm 21, pivoted, as at 28, on the bracket 23 and , upper 11 it of the housing 48. The ring 1| car- '
equipped with a weight 29. Movement of the
ries a p urality of threaded posts 12 surrounding
' wall 25 toward the. containers is limited by con 25 the top of the cone and projecting upwardly from
tact of said wall, as at 30, with one of the ?xed
said ring. The posts serve to support lower and
wail portions'24 as illustrated in Figure 4.
upper mounting ring sets respectively designated
Another'bracket 3| is'?xedly supported on the
13 and 14, said ring sets being adjustably mounted
framing opposite the container travel-way, and
on the posts 12, as at 15, so that the vertically I
this bracket supports another yieldable wall 32 '30- spaced relation of said ring sets can be adjusted.
which opposes the containers at and adjacent the
The ring sets 13, 14 carry image magnifying
inspection station. The wall 32 is pivoted about‘
lenses ML, which can be properly focused by ad- '
a vertical axis 33 on the bracket 3| and includes
justment of the ring sets. ,
an abutment arm extension 34 engaged by-a bell
The sighting housing 49 is mounted on top of
crank lever 35 pivoted, as at 36, On the bracket 35 the light projecting housing 48 through the me
and weighted, as at 31. -'I'he yieldable wall 32 is
limited against greater than desired inward move
dium of a base ring 16, being removably secured
to the top ring 1| and to the housing 48 as at 11.
ment by abutment means 38.
'
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_
The wall portion of the sighting housing 49 verti
Just beyond the inspection station; a. socket
cally overlying the cone 18 is disposed at an angle,
bearing 39 is vertically-adjustably sequred,_ as alt-‘4m as at 18, so as to support a‘ re?ecting mirror 19
48, to one of the frame angle irons; 9,' and the - - at a.proper angle for re?ecting the light rays
vertical bore or socekt of this bearing} serves. to, - from the interior container body bottoms magni
swingably mount a hood supporting standard'il. I '_ .-?ed by the-lenses ML through the horizontal
The standard 4| carries supporting arm exten
-ce_nte,r,of the sighting housing leg 50 toward the
sions 42 which serve to position a rectangular .45 flared end- 5| ‘thereof and the restricted‘ sighting
sighting frame 43 at the inspection station. Ad
ditional frame pieces 44 extend laterally from the
opening_53_in_ the focusing shield 52.
sighting frame 43 and serve as a supporting means
with breather or air .inlet apertures 80 protected
against ingress of light and dust by suitable
for a light shielding cloth or hood 45.
, At the sighting station and directly over the
longitudinal center of the belt, on suitable fram
ing 46 and on framing 41 supported indirectly
on the shelf |8,-is mounted a light projecting
housing 48 which communicates upwardly into a
sighting housing 49 having a horizontal extension 55
58 terminating in a ?are 5| disposed at the sight
ing frame 43. A focusing shield 52|is mounted
in the end of the ?are 5| or in the sighting frame
43, preferably the latter, and this shield is
The light projecting housing 48 is equipped
shielding 8|, and this housing also is equipped
with air draw oif apertures 82 leading into. a col
lector°83. The air collector 83 is also connected,
as at 84, with the transformer housing 65, and
by a duct 85 with the air draw off holes 86 formed,
in the sighting housing wall 18 above the mirror
19. The air collector 83 also is connected by a
duct 81 with the inlet of an evacuating pump 88
mounted, as at 89, on_ the. apparatus framing and
having its discharge connected with a duct 88
equipped with a limited diameter sight opening 60 which delivers through a- ?ared outlet 9| under
53. It will be understood that the cloth hood,
the light shielding hood 45 beneath which the
structure 45 shields the'apparatus against ingress
operative sits while inspecting the containers.
of outside light, and the focusing shield serves
A supplemental shield or hood 92 is supported
to shut out any light which might penetrate the
on a supplemental frameportion 93- and serves
cloth and also to facilitate direct perception by 65 to prevent ingress of light beneath the hood 45
the operative of the interior of the container in
through the breather apertures 94 formed in the
a manner later to be described.
main hood 45 above said supplemental shield.
The framing 41 is preferably vertically-adjust
By reason of the provision of "the breather
ably mounted, as at 54, on an extension 55 from
equipments just above described and the evacu
the screw housing ||.
70 ating pump and duct equipments, discomfort of
Within the light projecting housing 48 and on
the operative beneath the hood is prevented and
the base 56 thereof is mounted a plurality (four
clear vision in the sighting operation is assured
being shown) oflamps or light sources 51' each
by prevention of fogging of the re?ecting and
of which is adjustably mounted, as ‘at 58, on an
sighting surfaces.
‘,
insulator block 59 and backed by a reflector 60. 75
Means also is provided for protecting the eyes
5
2,411,991
of the operative from re?ected ?ashes of light
which wouldvordinarily result from placement of
the containers at the inspection station prior to
the inspection and removal thereof from the sta
tion after inspection. The top surfaces of the
is viewed through the photographic lens 68 and
magni?ed by the magnifying lenses ML as the
light rays from said interior container portions
are reflected by the mirror ‘I9 through the re
stricted sight opening 53 hereinbefore referred
to. In this manner all containers which might
contain bits of foreign matter may be readily
detected and removed from the line. This may
be accomplished manually, or by any suitable
manner stated. For this purpose a novel shutter
structure is provided which is effective to prevent 10 mechanical ejecting mechanism (not shown).
containers usually are somewhat shiny and capa
ble of re?ecting objectionable ?ashes of light to
the eyes of the operative while moving in the
these objectionable re?ections of light into the
eyes of an operative.
.
The framing 41 includes a horizontal shelf
As has been previously stated, the container
conveyor may be selected from various acceptable
forms, and may be driven in any approved man
ner. The well 'known chain belt composed of‘
portion 95 disposed directly beneath the light
projecting housing 48. The shelf portion 95 is 15 hingedly oonnectedcross slats is preferred, and‘
in Figure 7 there is illustrated one means for
apertured to rotatably support a stub shaft 00
which carries a rotary shutter comprising a fixed
upper plate 91 and a lower plate 90 which is ad
driving this belt. In this illustration the frame
0 including the corner angle irons 9 is supported
justable about the axis of said shaft. ' The upper
on a frame standard
III.
This standard - is
and lower plates 91 and Rare clamped together 20 equipped with a shelf H2 whereon is mounted
in their adjusted relation by a bolt 99 which
passes through the stub shaft 98, and said plates
in the manner best illustrated in Figures 5 and 6
of the drawings. The plates 91 and 08 are
equipped with identical edge cutouts I00, and by
relatively adjusting the positions of the plates
the cutouts compositely formed by the edge re
a speed reduction gearing of any approved design
generally designated H3. Rotation is imparted
to the power input vshaft Ill of this gearing by
sprocket and chain connections H0 with a driv
ing motor H6 suspended, as at Ill, from the
frame 8, 9,,and this rotation is transmitted at re- '
duced speed from the power output shaft H8,
and through sprocket and chain connections II9,
cesses I00 can be varied to suit the speed of rota
to the belt driving shaft and sprocket mounted
tion of the shutter and the interval of rest of
' each container at the inspecting station thereby 30 at I20 on the frame 8, 9. When the belt is thus
driven, the lower ?ight thereof is supported on
to'make it possible for the shutter to close the
guides mounted on thelower pair of angle irons 9.
inspection opening at all' times except when a
It is of course to be understood that the de
container is at rest with its open mouth portion
tails of structure and arrangement of parts may
IOI in registry therewith.
A sprocket I02 is‘amxed to the stub shaft 90 35 be variously changed and modified without de
and is driven by a chain I03 from a sprocket I04
mounted on the upper end of a shaft I05 verti
cally disposed and rotatable in a bearing I00 ‘
parting from the spirit and scope of our inven- -
tion.
'
We claim:
1. In apparatus . for interiorly inspecting
removably secured upon the screw vhousing II
opaque
containers open at one end, a visual in
40
in the manner clearly indicated in Figure l of
spection station, means for feeding containers to
the drawings. A bevel gear I01 is carried at the
lower end of the shaft E05 and is drivenby a » said station with the open ends thereof presented
to view at said station, holding them for an in
bevel gear I08 a?lxed to the trunnion at the
spection interval at said station, and then feed
delivery end of the timing screw i5. By this
means rotation is imparted to the shutter 91, 93 45 ingv them from said station, means at said station
for effecting a visual inspection of the interiors
in proper timed relation with the timing screw.
of the temporarily held containers through the
In order to additionally assure that each con
open ends thereof, and spring means engageable
tainer will be absolutely motionless while being
with each container held at said station for yield-.
' interiorly inspected at the inspection station,
there is provided a‘ leaf spring I09 supported, as 50 ably gripping and securing it against vibratory
movement during the inspection thereof.
at lie, on the framing 41 and disposed to engage
over atop portion of each container presented
at the inspection station in the manner illustrated
2. In
apparatus for interiorly
inspedting
opaque containers open at one end, a visual in- ‘
spection station, means for feeding containers to
in Figures 1 and 2 of the drawings.
In operation, containers 6 moving along in a 55 said station with the open endsthereof presented
to view at said station, holding them for an in
line on the conveyor 5 are intercepted by the
spection interval at said station, and then feed
timing screw it and are spaced thereby in a man
ing them from said station, means at said station
ner illustrated in Figure 4 and are individually
for e?ecting a visual inspection of the interiors
presented and held for a suitable. inspection inter
val by the dwell groove I6 of the screw at the 60 of the temporarily held containers through the .
open ends thereof, and shutter means for shield
inspection station. While each container is held
ing the containers from the visual inspection
motionless at the inspection station, the shutter
means at all times except when said containers
9Y7, 98, at other times effective to prevent objec
are motionless at said station.
tionable mfiections through the inspection open
3. In apparatus for interiorly inspecting opaque .
ing, serves to open said opening to the view of 65
containers, a visual inspection station, means at
an operative positioned beneath the light shield;
said station for e?ecting a visual inspection of
ing hood
.
the interiors of the temporarily held containers,
During each interval of inspection, the light
and means for feeding containers to said station,
projected from the light sources within light pro
jecting housing
is directed through the open» 70 holding them for an inspection interval at said
station, and then feeding them from said station,
lugs 53 to brightly illuminate‘ the interior of the
said last named means including a travelling con
container heing inspected. The illuminated inte
veyor constantly tending to feed containers in a
rior of the container at the bottom and the side
line to and past said station, a timing screw par-1
wall portions thereof to the extent of about two
thirds of the container depth above said bottom 75 alleling said conveyor for intercepting the con
2,411,991
tainer line and spacing the containers so that
they will be presented one by one at said station,
said screw having an annular groove therein ef
fective to hold each container for an inspection
interval at said station and a side clearance eilec
tive at the completion of said holding interval to
release the container and permit the conveyor to
take it away; shutter means for shielding the
a generally horizontally directed portion, means
in said light projecting housing for projecting
light into the interiors of containers supported
at said station, and means in said housing and
extension for receiving through the same open
‘tops light rays from the interior portions of the
container and effective for focusing said rays for
direct sight inspection at an enlarged scale by
containers from the visual inspection means at ‘ an operative, said latter means including means
all times except when said containers are motion 10' for reflecting‘ the focused light rays through said
generally horizontal portion to be visually in
less at said station; and means for imparting
movement to said screw and said shutter means
spected by the operative.
7. In apparatus for interiorly
inspecting
opaque containers, a visual inspection station,
opaque containers, a visual inspection station, 15 .means for supporting containers uprightly at said
station with their open tops uppermost for visual
means at-said station for effecting a visual in
inspection, a light projecting housing overlying
spection of the interiors of the temporarily held
said station, a sighting housing extension over
containers, and means for feeding containers to
lying the light projecting housing and including
said station, holding them for an inspection in
terval at said station, and then feeding them from V20 a generally horizontally directed portion, means
in said light projecting housing for projecting
' said station, said last named means including a
light into the interiors of containers supported
travelling conveyor constantly tending to feed
in timed relation.
4. In
apparatus
for
interiorly
inspecting
a1; said station, means in said housing and ex
containers in a line to and past said station, a
tension for receiving through the same open tops
timing screw paralleling said conveyor for inter
cepting the container line and spacing the con 25 light rays from the interior portions of the con
tainer and effective for focusing said rays for di
tainers so that they will be presented one by one
rect sight inspection at an enlarged scale by an
at said station, said screw having an annular
operative,,sald latter means including means for
groove therein effective to hold each container
re?ecting the focused light rays through said gen
for an inspection interval at said station and a
side clearance effective at the completion of said 30 erally horizontal portion to be visually inspected
by the operative, and means for evacuating air
holding interval to release the container and per
mit the conveyor to take it away; a rotary shutter
from said housing and its extension.
disc for shielding the containers from the visual
inspection means at all times except when said
8.- In apparatus for interiorly inspecting
opaque containers, a visual inspection station,
means for supporting containers uprightly at‘said
station with their open tops uppermost for visual
inspection, a light projecting housing overlying
containers are motionless at said station; means
for rotating the screw; and means for connecting
the shutter disc and the screw to rotate in unison
I
and in constantly timed relation.
said station, a sighting housing extension over
lying the light projecting housing and including
5. In apparatus for interiorly inspecting .
opaque containers, a visual inspection station, 40 a generally horizontally directed portion, means
means at said station for effecting a visual in
in said light projecting housing for projecting
_ spection of the interiors of the temporarily held _
' containers, and .means for feeding containers to
light into the interiors of containers supported at
said station, means in" said housing and extension
sighting clearances therein and being relatively
in said light projecting housing for projecting
for receiving through the same ‘open tops light
said station, holding them for an inspection in
terval at said station, and then feeding them from 45 rays from the interior portions of the container
and effective for focusing said rays for direct
said station, said last named means including a
sight inspection at an enlarged scale by an op
travelling conveyor constantly tending to feed
erative, said latter means including means for
containers in a line to and past said station, a
re?ecting the focused light rays through said
timing screw paralleling said conveyor for inter
cepting the container line and spacing the con 50 generally horizontal portion to be visually in
spected by the operative, an outside light exclud
tainers so that they will be presented one by one
ing hood for projecting over and shielding an op
at said station, said screw having an annular
erative making visual inspections before said gem
groove therein e?ective to hold each container for
erally horizontal portion, and means for evacuat
an inspection interval at said station and “a side
' ing air from said housing and its extension and
clearance effective at the completion of said hold
directing the same under said hood.
ing interval to release the container and permit
9. In apparatus for interiorly inspecting
the conveyor to take it away; a rotary shutter disc
for shielding the containers from the visual in
opaque containers, a visual inspection station,
means for supporting containers uprightly at said
spection means at all times'except when said con
tainers are motionless at said station; means for 60 station with their open tops uppermost for visual
inspection, a light projecting housing overlying
rotating the screw; and means for connecting the
said’ station, a sighting housing extension over
‘ shutter disc and the screw to rotate in unison and
, lying the light projecting housing and including
in constantly timed relation, said shutter disc in
cluding a pair of plates superposed and having
a generally horizontally directed portion, means
adjustable to vary the size of the effective sight-
light into the interiors of containers supported at
said station, means in said housing and extension
vidual plate clearances.
'
for receiving through the same open tops light
6. In apparatus’ for interiorly inspecting
rays from the interior portions of the container
opaque containers"; a visual inspection station, 70 and effective for focusing said rays for direct
means for supporting containers uprightly at said . sight inspection at an enlarged scale by an opera
station with their open tops uppermost for visual - tive, said latter means including means for re
inspection, a, light projecting housing overlying
?eeting the focused light rays through said gen
said station, a sighting housing extension over
erally horizontal portion to be visually inspected
lying the llght projecting housing and including 75 by the operative, an outside light excluding hood
ing clearance compositely formed by the indi
2,411,901
9
.
for projecting over and shielding an operative
making visual inspections before said generally
10
timing screw paralleling said conveyor for inter
cepting the container line and spacing the con
horizontal portion, a frame supporting said hood,
tainers so that they will be presented one by one
and means swingably mounting said hood so that
it can be swung to and from cooperative rela
tion to the generally horizontal portion without
.at said station, said screw having an annular ‘
tainers so that they will be presented one by one
at said station, said screw having an annular
groove therein effective to hold each container
for an inspection interval at said station with its
open top uppermost and a side clearance effective
in said light projecting housing for projecting
light into the interiors of containers supported
at said station, means in said housing and ex
tension for receiving through the same open tops
lying the light projecting housing and including
erally horizontal portion to be visually inspected
groove therein effective to hold each container
for an inspection interval at said station with its
open top uppermost and a side clearance eifective
disturbing other parts of the apparatus.
at the completion of said holding interval to re
10. In apparatus for interiorly inspecting
lease the container and permit the conveyor to
opaque containers, a visual inspection station, a
travelling conveyor constantly tending to feed l0 take it away, a light projecting housing overlying
said station, a sighting housing extension over
containers in a line to and past said station, a
lying the light projecting housing and including
timing screw paralleling said conveyor for inter
a generally horizontally directed portion, means
cepting the container line and spacing the con-.
light rays from the interior, portions of the con
tainer and effective for focusing said rays for di
at the completion of said holding interval to re
lease the container and permit the conveyor to 20 rect sight inspection at an enlarged scale by ‘an
operative, said latter means including means for
take it away, a light projecting housing overlying
reflecting. the focused light rays through said gen
said station, a sighting housing extension, over
a generally horizontally directed portion, means
by the operative, a rotary shutter disposed- to-have
in said light projecting housing for projecting
light into the interiors of containers supported at
' a portion thereof movable at times over the open
said station, and means in said housing and ex
tension for receiving through the same open tops
' light rays from the interior portions of the con
top of a container held at said station, means for
rotating the screw and the shutter in timed rela
tion so that the shutter is opened to permit said
light projection into a container interior and said
tainer and effective for focusing said rays for 30 receiving and enlarged focusing of light rays'from
a container interior only when a container is sta
direct sight inspection at an enlarged scale by an
tionary at said inspection station, means provid
operative, said latter means including means for
ing a restricted sighting opening through which '
re?ecting the focused light rays through said gen
erally horizontal portion to be visually inspected
by the operative.
‘
'
'
11. In apparatus for interiorly inspecting
opaque containers, a visual inspection station, a
travelling conveyor constantly tending to feed
said operative can effect said direct sight inspec
tion, and an outside light excluding hood for pro
jecting over and shielding said operative when
making visual inspections through said sighting
opening.
'
-
13. In apparatus for interiorly inspecting
containers in a line to and past'said station, a
timing screw paralleling said conveyor for inter 40 opaque containers, a visual inspection station, a
travelling conveyor constantly tending to feed
cepting the container line and spacing the con
containers in a line to and past said station, a
tainers so that they will be presented one by one
timing screw paralleling said conveyor for inter- .
at said station, said screw having an annular
cepting the container line and spacing the con
groove therein effective to hold each container for
an inspection interval at said station with its ~13 tainers so that they will be presented one by one
at said station, said screw-having an annular
open top uppermost and a side clearance e?ective
groove therein effective to hold each container for
at the completion of said holding interval to re
an inspection interval at said station with its
lease the container and permit, the conveyor to open top uppermost and a side clearance effective ,
take it away, a light projecting housing overlying
said station, a sighting housing extension overly- , at the completion of said holding interval to re
lease the container and permit the conveyor to
ing the light projecting housing and including a
generally horizontally directed portion means in
said light projecting housing for projecting light
into the interiors of containers supported at said
station, means in said housing and extension for ,
receiving through the same open tops light rays
from the interior portions of the container and
effective for focusing, said rays for direct sight
inspection at an enlarged scale by an operative,
said latter means including means for re?ecting
the focused light rays through said generally hori—
zontal portion to be visually inspected by the op
erative, a rotary shutter disposed to have a portion
thereof movable at times over the open top of a
container held at said station and means'for ro
tating the screw and the shutter in timed relation
so that the shutter is opened to permit said light
projection into a container interior and said re
ceiving and enlarged focusing of light rays from
a container interior only when a container is sta
tionary at said inspection'station.
l2. In apparatus for interiorly inspecting
opaque containers, a visual inspection station, a
travelling ‘conveyor constantly tending to feed
containers in a line to and past said station, a
take it away, a light projecting housing overlying
said station, a sighting housing extension over
lying the light projecting housing and including
a generally horizontally directed portion means
in said light projecting housing for projecting
light into the interiors of containers'supporte'd at
said station, means in said housing and extension
for receiving throughv the same open tops'light
rays from the interior portions of they container
and effective for focusing said rays for direct
sight inspection at an enlarged scale by an op
erative, said latter means including means for
re?ecting the focused light “ rays through said
- generally horizontal portion to be- visually in
spected by the operative, a rotary shutter dis
posed to have a portion thereof movable at times
over the open top of a container held at. said sta
tion, means for rotating the screw and the shutter
'in timed relation so that the shutter is opened to
permit said light projection into a container in
terior and said receiving and enlarged focusing
of light rays from a container interior only when
a. container is stationary at said station, means
providing a restricted sighting opening through
2,411,091
11
which said operative can effect said‘ direct sight
inspection, an outside light, excluding hood for
projecting over and shielding said operative when
12
inspection opening, means centered over the in
spection opening for receiving through the in
spection opening and focusing the light rays from
making visual inspections through said sighting
each container bottom under inspection, and a
opening, and means for evacuating air from said
housing and its extension and directing the same
sighting window in said housing through which
the-focused light rays areviewable.
under said hood.
15. An apparatus as de?ned in claim 14 in
which there is included a shutter operable to al
, 14. In
apparatus
~
for
interiorly
inspecting
ternately open and close the inspection opening,
have restricted pouring throats at their upper ex< 10 and means to operate the shutter so that it will
open the inspection opening only when a con
tremities, a light excluding housing having a ?oor
opaque containers which are relatively deep and
and side walls and a limited area inspection open
ing in said ?oor surrounded by light directing -
tainer is stationary therebeneath.
16. An apparatus as defined in claim 14 in
openings, means for moving containers past and
which there is included a horizontal extension of
beneath the housing with their throats centered 15 the upper part of the housing, in which the sight
ing window is disposed vertically in‘ said housing
on and close to said inspection opening, means
extension, and in which there is included an an
for stopping each'container for a limited inspec
gularly disposed mirror in the housing which is
tion interval beneath said inspection opening,
light sources arranged in said housing, re?ecting
e?ective to re?ect the focused light rays to the
means arranged adjacent the inspection opening 20 vertically disposed window.
in position for re?ecting light from said sources -
through the light directing openings into all parts
of the bottom of a container stopped beneath the
ISAAC W. ENGLAND.
WILLIAM F. PUNTE.
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