Weighing scales – Computer – Electrical
Reexamination Certificate
2001-10-09
2004-03-09
Gibson, Randy (Department: 2841)
Weighing scales
Computer
Electrical
C177S180000, C177S238000, C177S244000
Reexamination Certificate
active
06703568
ABSTRACT:
TECHNICAL FIELD
The present invention related to a combination weighing apparatus, and more particularly to a combination weighting apparatus structured such that a weighing accuracy with respect to a subject to be weighed is not affected by internal and external vibrations, and to a vibration sensor that compensates for the influence of the vibrations, obtainable at low cost and without an increase in overall weight of the apparatus.
Further, the present invention relates to a combination weighing apparatus, and more particularly to a combination weighing apparatus structured such that the subject to be weighed and fine powder thereof hardly attach thereto, and maintenance and cleaning operations can be easily carried out during normal operations.
BACKGROUND ART
As is well known, conventionally, a combination weighing apparatus is employed for bagging foods, that is, goods individually having uneven mass, for example, potato chips, peanuts, fruit, sausages and the like at a predetermined mass or a substantially predetermined mass.
In this kind of combination weighing apparatus, for example, a plurality of radial feeders are radially provided around a center dispersing table, a plurality of stock hoppers, a plurality of weighing hoppers and the like are vertically arranged respectively below a front end of each of the radial feeders, and a collecting chute is provided below each of the stock hoppers, each of the weighing hoppers and the like.
Further, in the combination weighing apparatus mentioned above, for example, the subjects to be weighed such as food or the like as mentioned above are supplied to the dispersing table by a conveyor or the like, and dropped down into each of the stock hoppers by a plurality of radial feeders, and are then dropped down into each of the weighing hoppers by the downward action of the stock hoppers. Further, the subjects are weighed at each of the weighing hoppers.
In this case, the combined mass of all the subjects in the plurality of weighing hoppers is calculated by a calculating portion (not shown), whereby a predetermined mass or a combination close thereto is selected, and thereafter, the subjects are dropped down and discharged to a collecting chute from each of the weighing hoppers so as to be collected there.
Then, the weighed subjects are dropped down to the collecting chute so as to be gathered together and are conveyed out to the next process, such as a packaging process or the like.
Accordingly, in the conventional combination weighing apparatus having the structure mentioned above, for example, as shown in
FIG. 34
, a hollow polygonal tube shaped casing
2
is fixed on a stand
1
.
Further, a dispersion table
3
is provided above the casing
2
, and a collecting chute
5
is provided below the casing
2
.
Further, a number of feeders
4
,
4
, . . . are radially provided above the casing
2
and around the dispersion table
3
.
Further, a number of stock hoppers
6
,
6
, . . . are provided in a circumferential direction along an upper portion of a side wall
2
a
in the casing
2
, and weighing hoppers
7
,
7
, . . . and memory hoppers
8
,
8
, . . . corresponding to lower portions of the respective stock hoppers
5
are provided in upper and lower portions, respectively.
Further, fixed ends of respective weighing devices
10
,
10
, . . . for the weighing hoppers
7
,
7
, . . . in the middle of the stock hoppers
6
,
6
, . . . and the memory hoppers
8
,
8
, . . . are fixed to respective weighing device bases
11
,
11
, . . . fixed to an inner surface of the side wall
2
a
of the casing
2
.
Further, respective supporting bodies
12
,
12
, . . . fixed to free ends of the respective weighing devices
10
,
10
, . . . are protruded outward from respective holes
13
,
13
, . . . .
The weighing hoppers
7
,
7
, . . . are supported by front ends of the respective supporting bodies
12
,
12
, . . . , respectively.
A feeder base
15
is fixed to the above within the side wall
2
a
of the casing
2
.
A number of vibrating devices
16
,
16
, . . . are fixed to an upper surface of the feeder base
15
.
Respective vibration shafts
16
a
,
16
a
, . . . of the vibrating devices
16
,
16
, . . . are respectively protruded upward from holes
17
,
17
, . . . of an upper wall
2
b
in the casing
2
.
The feeders
4
,
4
, . . . are respectively fixed to upper ends of the respective vibration shafts
16
a
,
16
a, . . . .
That is, the respective feeders
4
,
4
, . . . are vibrated due to vibrations transmitted from the respective vibration shafts
16
a
,
16
a
, . . . of the vibrating devices
16
,
16
, . . . and the subjects to be weighed on the respective feeders
4
,
4
, . . . are dropped down to the respective stock hoppers
6
,
6
, . . . .
However, in the conventional combination weighing apparatus having the structure mentioned above, since the respective weighing device bases
11
,
11
, . . . are provided between the feeder base
15
fixed to the upper portion of the hollow polygonal tube shaped casing
2
fixed on the stand
1
and the stand
1
, the respective weighing devices
10
,
10
, . . . are little affected by the vibration of the respective vibrating devices
16
,
16
, . . . , leading to a disadvantage that a weighing accuracy with respect to the subject to be weighed is deteriorated.
Further, since the respective weighing device bases
11
,
11
, . . . are mounted to the side wall
2
a
of the hollow casing
2
at every weighing devices
10
,
10
, . . . , a stable operation of the respective weighing devices
10
,
10
, . . . depends upon a rigidity of the casing
2
, so that it is necessary to firmly form the casing
2
at that degree for stabilizing the weighing operation, whereby there is a disadvantage that the weight is increased as a whole of the apparatus.
Further, it is necessary to provide a vibration sensor for compensating for the effects of the external vibration in the installing place of the stand
1
, however, in the conventional apparatus shown in
FIG. 34
, since the respective weighing device bases
11
,
11
, . . . are provided in every weighing device
10
,
10
, . . . , it is necessary to mount the vibration sensors (not shown) to every weighing device base
11
,
11
, . . . , which is a disadvantageous as the cost is increased.
Further, as the conventional combination weighing apparatus, there has been known an apparatus structured as shown in FIG.
35
.
That is, in this combination weighing apparatus, the dispersion table
3
and a number of radial feeders
4
,
4
, . . . are provided above the casing
2
provided in a center, and the collecting chute
4
is provided below the casing
2
.
Further, a number of stock hoppers
6
,
6
, . . . are provided in a circumferential direction along the outer periphery of the casing
2
, and the corresponding weighing hoppers
7
,
7
, . . . and memory hoppers
8
,
8
, . . . are respectively provided in the upper and lower portions below the respective stock hoppers
6
,
6
, . . . .
Further, in the conventional art, the casing
2
is, as shown in
FIG. 35
, formed in a hollow polygonal column shape having a corresponding number of flat side walls
2
a
to the number of the hoppers arranged in the circumferential direction.
A rectangular window
18
is provided in each of the side walls
2
a
of the casing
2
.
Further, a rectangular flat mounting plate
19
is detachably fixed from an outer side of each of the side walls
2
a
in the polygonal casing
2
, thereby closing the window
18
.
Further, the respective hoppers
6
,
7
and
8
are vertically mounted to outer sides of the respective mounting plates
19
, and a motor M corresponding to a drive source for opening and closing an opening and closing lid (not shown) of discharge ports in the respective hoppers
6
,
7
and
8
is vertically mounted inside the mounting plates
19
at every hopper
6
,
7
and
8
.
A weighing device W for the weighing hopper
7
is mounted inside the mounting plate
19
, and the structure is made such that a lever for driving the opening and closing lid
Asai Eiji
Tanaka Osamu
Wako Kazuyoshi
Anritsu Corporation
Frishauf Holtz Goodman & Chick P.C.
Gibson Randy
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