Package making – Means to fill and close preformed receptacle – Receptacle comprising bag
Reexamination Certificate
2000-02-23
2002-04-30
Rada, Rinaldi I. (Department: 3721)
Package making
Means to fill and close preformed receptacle
Receptacle comprising bag
C241S260100
Reexamination Certificate
active
06378270
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a powder grain material control unit for stopping the discharge of the powder grain material and a powder grain material filling unit providing this unit with the powder grain material outflow portion for filling with powder grain material.
In medicines and foodstuff, powder or grain (called “powder grain material” in a general term) is existent in the past. Generally, in many cases, the powder grain material is dealt with by packing in a bag or a container.
A powder grain material filling unit as shown in
FIG. 10
is one instance of the unit for filling a bag with the powder grain material.
This powder grain material filling unit
20
has a hopper
22
in the shape of a cone provided with a support frame
21
for storing the powder grain material, a drop guide cylinder
23
provided with the lower portion of the hopper
22
for guiding the drop of the powder grain material, a rotatable auger (another name is a screw)
25
connected with a driving motor
24
positioning on the upper portion of the hopper
22
and stored in the drop guide cylinder, and a powder grain material control unit
26
provided with the drop guide cylinder
23
for stopping the discharge of the powder grain material from the drop guide cylinder
23
.
The powder grain material control unit
26
has a pair of plungers
27
,
27
provided with the drop guide cylinder
23
, and a switch valve
28
in the shape of a cone made of resin, for opening and closing a powder grain material outflow portion
23
a
of the drop guide cylinder
23
, going up and down by these plungers
27
.
When the driving motor
24
is started to operate so as to rotate the auger
25
after the powder grain material is entered in the hopper
22
, the powder grain material in the hopper flows in the drop guide cylinder
23
. But, the drop of the powder grain material is adjusted so as to transfer to the lower hand by the rotating auger
25
.
When the plungers
27
of the powder grain material control unit
26
are not operated, the switch valve
28
opens the powder grain material outflow portion
23
a
of the drop guide cylinder
23
, being away from the lower portion of the drop guide cylinder
23
. The powder grain material P drops in a transparent vinyl bag
29
, for instance, receiving the lower portion of the drop guide cylinder
23
.
When a predetermined quantity of the powder grain material drops in a vinyl bag, the plungers
27
are operated so as to pick up the switch valve
28
. The switch valve
28
adheres to the powder grain material outflow portion
23
a
of the drop guide cylinder
23
and closes the powder grain material outflow portion
23
a
so as to stop the discharge of the powder grain material.
Lastly, a pair of bag closing pieces
30
(seen as one in
FIG. 10
since they overlap each other) approach each other from the front and the back of the vinyl bag
29
(the direction of the inside and the outside of the paper) so as to hold the upper portion of the vinyl bag
29
. A pair of the bag closing pieces
30
are heated and the vinyl bag
29
is sealed by melting and adhering the vinyl to each other.
On this occasion, the vinyl bag is formed by closing the vinyl cylinder supplied enclosing the powder grain material control unit with the bag closing pieces
30
.
But, the following problems are existent since the conventional powder grain material control unit
26
stops the discharge of the powder grain material by adhering the switch valve
28
in the shape of a cone to the powder grain material outflow portion
23
a.
That is, the powder grain material is held between the switch valve
28
and the powder grain material outflow portion
23
a,
then the space generates, then, the discharge of the powder grain material can not be completely stopped since the powder grain material continues to slightly flow from the space.
If it is used for a long time, wear and tear generate at the portion of the switch valve made of resin contacting the powder grain material outflow portion
23
a.
Then, the powder grain material outflow portion
23
a
can not be certainly sealed by the switch valve
28
, so it is necessary to change the switch valve.
The sound of operating a pair of plungers
27
is the origin of noise.
The switch valve
28
and the powder grain material outflow portion
23
a
vibrate by the vibration of a pair of plungers
27
at the time of operating, and the portion contacting the switch valve
28
and the powder grain material outflow portion
23
a
with each other is shifted from each other so as to generate a space. Then, the powder grain material may drop from the space.
It is difficult to make the switch valve
28
the smaller since it is provided with a switch valve support plate
31
interlocking the plungers
27
.
Besides, the powder grain material filling unit having the above-mentioned conventional powder grain material control unit which can not certainly stop the discharge of the powder grain material has the following problems.
The quantity of filling the powder grain material varies widely and the accuracy of filling is bad.
It is impossible to make the minimum size of a bag small since the switch valve support plate
31
interlocking the plungers
27
, supporting the switch valve
28
is entered in the bag.
Since the powder grain material discharged from the powder grain material outflow portion
23
a
drops, hitting the switch valve
28
and the switch valve support plate
31
crossing the lower hand of the powder grain material outflow portion
23
a,
it is blown up in the bag in case of a transparent bag, so the degree of transparency in the bag
29
is reduced. Then, it is difficult to confirm the filling state in the bag
29
from the outside.
In case of a vinyl bag, the powder grain material being blown up in the vinyl bag
29
also adheres to the upper portion of the inside of the vinyl bag
29
. When the vinyl bag
29
is sealed by melting and adhering the upper portion of the vinyl bag
29
with a pair of bag closing pieces
30
heated, it is hard to adhere vinyl to each other. Then, it is difficult to completely seal the vinyl bag
29
.
For instance, the measuring accuracy of the weight measuring means for measuring the weight of the powder grain material is reduced by the vibration of a pair of plungers
27
at the time of operating, so it is difficult to improve the filling accuracy.
Then, there is the unit having a butterfly valve (not shown) for opening and closing the powder grain material outflow portion by a rotatable switch valve as the powder grain material control unit wherein vibration is few.
In this powder grain material control unit, the switch valve rotates and vibration is few, but the powder grain material is held between the switch valve and the inner wall of the powder grain material outflow portion. Then, a space generates, and the powder grain material may drop out from the space.
Besides, when the powder grain material is held between the switch valve and the inner wall of the powder grain material outflow portion, the switch valve may not be opened thereafter.
Anyway, the conventional powder grain material control unit may not certainly and speedily stop the discharge of the powder grain material since the discharge of the powder grain material is stopped with mechanical operation by adhering the parts to each other and then, a space generates between the parts for stopping the discharge of the powder grain material.
SUMMARY OF THE INVENTION
The object of the present invention is to provide the powder grain material control unit for certainly and speedily stopping the discharge of the powder grain material with no mechanical operation by adhering the parts to each other.
Besides, the object of the present invention is to provide the powder grain material control unit having few necessity of changing the parts by making it such a structure that no wear and tear generates on the parts after using for a long time.
Besides, the object of the present invention is to provide the powder grain material control unit
Araki Shigeru
Morimoto Hajime
Chukwurah Nathaniel
Duane Morris LLP
Kabushiki Kaisha Tekunika
Rada Rinaldi I.
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