Note: Descriptions are shown in the official language in which they were submitted.
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A sorter system of the grader type
The present invention relates to a portioning apparatus
of the grader type, i.e. an apparatus having an inlet for a
flow of mutually separated objects, a station for detecting a
relevant quality of the objects, preferably their weight, a
control unit, a conveying line for further conveying the ob-
jects along a sorting out path with an associated series of
receiver containers, diverter means for selectively unloading
the objects, controlled by the control unit, for an accumula-
tive building up of desired object portions in the receiver
containers, actuation means controlled by the control unit
for effecting outletting of finished portions from the recei-
ver containers, and conveyor means located underneath the
containers for currently receiving and delivering the finish-
ed portions.
This type of apparatus is used primarily in the food in-
dustry, for the handling of fresh or frozen pieces of food-
stuff to be merged into portions according to predetermined
criteria, e.g. for achieving a fixed portion weight with a
higher or lower tolerance, despite the objects exhibiting a
marked weight distribution.
Thus, what is actual is the handling of unwrapped ob-
jects, which can be anticipated to be more or less sticky or
as far as the frozen objects are concerned more or less
fragile, and the apparatus, of course, should be adapted cor-
respondingly.
Preferably, the said conveying path is constituted by a
suitable conveyor belt, while the diverter means are made as
diverter wings which may be selectively swung-in over the
belt at the relevant places and moments of time for guiding
or even throwing out the objects to the respective receiving
or portioning containers, whereafter they are immediately
swung out again for enabling a free passage of following ob-
jects to succeeding containers.
The receiving or portioning containers should be designed
such that they are suitable for reception of both sticky and
semi-fragile objects, i.e. with steep walls for avoiding ad-
herence of a received object to a wall portion rather than
the objet reaching the outlet bottom of the container, and
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with a relatively low building height for preventing fragile
objects from reaching the bottom with such a high speed of
falling that objects could incidentally break. A low building
height, of course, will be desirable also for other reasons,
e.g. because underneath the containers space should be provi-
ded for the outlet conveyor to receive the finished portions
from the containers.
When a desirably high working speed is used, even with
optional throw-out action, the unloading will be connected
with a certain spread in the delivery positions of the arti-
cles at the single containers, i.e. these should have a
mouthing of a certain oversize relative to the size of the
articles. Seen in the transverse direction of the conveyor
belt this is no special problem, but i~ the longitudinal di-
rection it results in the conveyor having to be built with a
kind of overlength, implying extra costs and space require-
ments.
The invention has for its purpose to provide an apparatus
of the type specified, by which the said conveyor may be
built with reduced length for a given number of receiver con-
tainers.
According to one aspect of the present invention,
there is provided a portioning system of the grader type,
having an inlet for a flow of mutually separated objects, a
station for detecting and registering a relevant quality of
the objects, a control unit, a conveying line for further
conveying the objects along a sorting out path with an
associated series of receiver stations comprising receiver
containers, diverter means for selectively unloading the
objects, controlled by the control unit, for an
accumulative building up of desired object portions in the
receiver containers, actuation means controlled by the
control unit for effecting outletting of finished portions
from the receiver containers, wherein the receiver stations
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each comprise at least two receiver containers and have
switching means for selective actuation of these containers
for object reception, and wherein these switching means are
constituted by means for moving the containers themselves
or parts thereof for positioning a mouth opening of a
selected container in the relevant position for direct
reception of objects from the conveying line.
With the invention is it realised that in this respect
there is not much to~~gain by a reduction of the distance be-
tween the receiver containers along the conveyor, as the con-
tainers may already be located quite close to each other, and
it is even renounced to reduce the length dimension of the
containers in the length direction of the conveyor, inasfar
as the said spread in the delivery positions of the articles
is accepted. However, in connection with the invention it has
been recognised that it is advantageously possible to make
use of a special cross distribution principle previously sug-
gested in a deviating concept, viz. in connection with a
postal sorting system for envelopes and small parcels accord-
ing to US-A-4,732,260, where use is made of a controlled sys-
tem for a selective distribution of objects received in each
°single receiver station to a plurality of receiver containers
therein, viz. in the form of postal bags arranged in a row
crosswise of the moving direction of the sorter conveyor.
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Thus, in the space occupied by the individual receiver stati-
ons there may be more than a single receiver container, and
already if there are two containers in each station this will
imply that the length of the conveyor may be halved, which
will be a significant result. The said known system is based
on the idea of providing above the said postal bags a distri-
butor system, which can receive the articles from the sorter
conveyor and distribute them to the different receiver bags.
Basically, this will not be compatible with the discussed
requirements as to steep sides and low falling height, but
according to the invention it is possible to use a modified
principle, based on the individual containers themselves or
their upper mouthings being selectively positionable in a re-
ceiver position laterally of the sorter conveyor. Thus, the
articles may then be delivered directly to the containers
without having to pass a separate distributor system, and it
is possible to thereby achieve an operational delivery of the
sticky or frozen articles. The building height may remain
low, and it will not be noticeably more difficult to effect
the required periodical cleanings of the apparatus.
When operating the apparatus with a reasonably high speed
it will hardly be realistic to use more than two portioning
containers in each receiver station, but already thereby it
is achievable to half the conveyor length, while also the
number of diverter units may be reduced correspondingly. The
length and the associated space requirements may be further
reduced if double containers are arranged at both sides of
the conveyor.
The more straight forward possibility of arranging for
the required switchings between two containers is to mount
the pair of containers in a cross displaceable manner rela-
tive to the conveyor belt, but as mentioned below this will
imply certain problems. With the invention, however, there is
provided for another and better solution, based on the alrea-
dy existing condition of the containers having to exhibit, in
the length direction of the conveyor, a length which is some-
what bigger than corresponding to the expectable sizes of the
articles; this is required because at each receiver station
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there will be some spread with respect to the place of de-
livery of the articles over the edge of the conveyor belt.
Normally, the associated overlength of the containers will
imply unnecessarily large container bottom areas, and in a
preferred embodiment of the invention this is used to the ef-
fect that there is pivotally arranged, near a middle area of
the bottom of a singular container, an upwardly projecting
partition plate which divides the container in two container
parts, but which, in being pivoted between the opposite
sides, may nevertheless make both container parts appear with
practically the same upper mouthing corresponding to the cor-
rectly placed mouthing of the singular container. The two
--- container parts should not anyway receive articles at the
same time, and a switch over of the partition plate can be
effected very rapidly, such that the two container parts can
be operative in immediate succession. Only they should be
provided with individually openable bottoms.
The use of this pivotable plate may invoke an approach to
the above mentioned problem with respect to undesired in-
clined walls, at least in one outer position of the plate.
This possible problem will be accentuated by the desired low
building height of the container, as the pivot plate should
then be moved through a relatively large angle in order to be
switched between the opposed mouthing edges of the container.
However, it is an inherent possibility that the relevant in-
clined plate can be affected to swing up from the inclined
position, even impactwise, such that an adhering article, if
any, gets the opportunity to slide down or, respectively, is
directly thrown off from the wall for fall-down into the de-
dicated container part.
The thus sectionized unitary containers may, therefore,
appear with rather conventional outer dimensions, this also
applying to the bottom, irrespectively of the bottom now ap-
pearing as two singular bottom portions. For the same reason
the underlying outlet conveyor may be of an unchanged, con-
ventional width, however without the invention being corre-
spondingly restricted.
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In the following the invention is described in more de-
tail with reference to the drawing, in which:
Fig. 1 is a perspective view of an apparatus according to
the invention:
5 Fig. 2 is a top view thereof;
Figs. 3 and 4 are end views of a receiver container in
the apparatus;
Fig. 5 is a side view thereof, and
Fig. 6 is a schematic end view of a modified embodiment.
In its basic concept, the apparatus shown in Fig. 1 is a
conventional grader, with a feeding belt 2, a weighing belt 4
connected with a memorising control computer 6, and a sorter
belt 8, along which there is mounted, at one or both sides, a
fixed row of receiver containers l0. Opposite these contain-
ers, as shown to the right in Fig. 2, there are provided di-
verter wings 12 which, controlled by the computer 6, are op-
erable to be swung across the belt 8 such that articles, when
weighed and moved further on this belt, can be selectively
unloaded to the various containers, in which it is then pos-
Bible to build up article portions according to selected cri-
teria. To the left in Fig. 2 it is shown that instead of
wings 12 to be swung towards the associated container it is
possible to use wings 14 which are swung out from the respec-
tive containers; it is possible to hereby work with contain-
ers located opposite to each other, whereby the length of the
belt 8 can be halved for a given number of containers.
Preferably, there is underneath each row of containers
mounted a conveyor belt 16,-Fig 1, which may receive the fin-
ished portions as these are delivered from the containers,
via computer controlled bottom valves therein.
So far described the system represents prior art.
According to the invention there is arranged in each con-
tainer an upstanding partition plate 18 which, e.g. by means
of a cylinder 20, can be swung towards and away from the ad-
jacent side edge of the belt 8, confer the two positions
shown in Figs. 3 and 4, respectively. As indicated in Fig. 1,
the bottom of the containers is designed with or as individu-
ally retractable bottom valve plates 22, which can be pushed
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in and out by means of individual cylinders 24 and 26 for
opening and closing of the bottom of the respective compart-
ments, in which the container is divided by the partition
plate 18.
As the computer 6 is already in advance adapted to cur-
rently select a container 10 for reception of specific arti-
cles, such a selection may as well be related to each of the
two container units here constituted by the two compartments
of each container 10, all according to the position of the
partition plate 18, and such a selection, therefore, may also
comprise an actuation of the cylinders 20 for switching over
the plates 18 for an operative formation of the respective
receiver compartments. Correspondingly, the computer may pro-
voke a selective opening of the bottom valves 22 of the res-
pective compartments, such that the final consequence is that
the grader operates with twice the number of receiver con-
tainers relative to the factual, space occupying number
thereof. Thus, the length of the belt 8 can be halved.
The innermost top edge of the containers 10 is located
just outside and slightly beneath the associated side edge of
the conveyor belt 8, while the outer rear wall of the con-
tainers projects further upwardly, in order to catch articles
directly thrown off the belt 8. It will be noted from Fig. 3
that the pivot plate 18 in its upstanding position projects
almost correspondingly, whereby it fulfils the same purpose
for guiding articles to the innermost space portion of the
containers.
In its inclined position shown in Fig. 4, the pivot plate
18 will be near such a small inclination that there may be a
potential risk of received, sticky articles sticking to this
plate. However, the control equipment is so adapted that the
pivot plate 18, immediately upon an article having been de-
livered to the container, see Fig. 4, will be abruptly up-
wardly pivoted, such that a received article can easily slide
or be thrown down to the outermost container section. The
computer will then control the pivot plate 18 to remain up-
standing or to pivot to the position of Fig. 4, as a prepar-
tion for the reception of the next relevant article.
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In principle, the pivot plate 18 may be arranged cross-
wise of the position shown, such that it is pivotable in the
longitudinal direction of the belt.
In the right hand side of Fig. 6 it is indicated that a
possible alternative is to use two built-together containers
28 which, as a whole, may be tilted about a lower axis 30 for
operative actuation of one container or the other. To the
left in Fig. 6 it is correspondingly shown that at each con-
tainer position along a side edge of the belt 8 there may be
provided a cross displaceable row of containers 32 which, by
any suitable means, may be displaced between different opera-
tive receiver positions relative to the side edge of the belt
8 and preferably a single delivery position, in which the
valve bottom of a ready filled container section 32 is lo-
Gated above the outlet belt 16. Also here, in principle, the
displacement could be effected in the longitudinal direction
of the belt, but that would require extra space along the
belt.
These last mentioned embodiments are subject to the limi-
tation that the container sections should be able, partly, to
be moved under the lower return run of the belt 8, but this
may be acceptable if the return run is carried rather close
to the upper conveyor run or if the objects are delivered
from the conveyor so accurately that they can be received
without assistance from the rear or particularly the foremost
walls of the containers 10.
It should be mentioned that the supplied and handled
"objects" may be constituted by portions of still smaller ob-
jects.
The invention also comprises the disclosed method of por-
tioning out the supplied objects.
