U.S. patent application number 12/401670 was filed with the patent office on 2009-09-17 for machine for filling containers with at least one powdered product.
Invention is credited to Angelo ANSALONI.
Application Number | 20090229705 12/401670 |
Document ID | / |
Family ID | 39627387 |
Filed Date | 2009-09-17 |
United States Patent
Application |
20090229705 |
Kind Code |
A1 |
ANSALONI; Angelo |
September 17, 2009 |
MACHINE FOR FILLING CONTAINERS WITH AT LEAST ONE POWDERED
PRODUCT
Abstract
In a continuous machine for filling containers with at least one
powdered product, each container is fed along a path phased with a
corresponding metering device, which transfers the product from a
tank to the container, and has a cylinder and a piston axially
movable under the bias of corresponding tappets engaged in
corresponding cams; the cam of the piston having a horizontal
segment, which keeps the piston on the upper surface of the product
during the insertion of the cylinder into the product itself, and
whose vertical position is selectively controlled according to a
height of the product in the tank.
Inventors: |
ANSALONI; Angelo;
(Crespellano, IT) |
Correspondence
Address: |
GOTTLIEB RACKMAN & REISMAN PC
270 MADISON AVENUE, 8TH FLOOR
NEW YORK
NY
10016-0601
US
|
Family ID: |
39627387 |
Appl. No.: |
12/401670 |
Filed: |
March 11, 2009 |
Current U.S.
Class: |
141/238 |
Current CPC
Class: |
A61J 3/074 20130101;
G01F 11/021 20130101; G01F 11/023 20130101; B65B 1/363 20130101;
B65B 1/385 20130101 |
Class at
Publication: |
141/238 |
International
Class: |
B65B 37/06 20060101
B65B037/06 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 12, 2008 |
EP |
08425148.7 |
Claims
1. A machine for filling containers (3), in particular capsules,
with at least one powdered product, in particular a pharmaceutical
product, the machine comprising conveying means (15) for
continuously feeding each container (3) along a given path (P); a
tank (17) for the product; at least one metering wheel (4) mounted
to continuously rotate about a longitudinal axis thereof (6); a
plurality of metering devices (19), each of which includes a
corresponding cylinder (29) and a corresponding piston (38), and is
fed by the metering wheel (4) firstly through a first withdrawal
station (20) of a given amount of product from the tank (17) and
then along a portion of the path (P) phased with a corresponding
container (3) for transferring the product into the container (3)
itself; and an actuating device for axially displacing each
cylinder (29) and the corresponding piston (38) in a direction (26)
parallel to said axis (6), the actuating device comprising a first
cam (35) extending about said axis (6), a first tappet (34) carried
by the piston (38) and engaged in the first cam (35) , a second cam
(25) extending about said axis (6), and a second tappet (24)
carried by the cylinder (29) and engaged in the second cam (25),
the first cam (35) comprising a first segment substantially
parallel to the second cam (25) and a substantially horizontal
second segment (40), which is connected to the first segment, and
is arranged at the withdrawal station (20) for keeping the piston
(38) on the upper surface of the product contained in the tank (17)
during the insertion of the cylinder (29) into the product itself;
and being characterized in that it comprises a first adjustment
device (51, 53) for selectively controlling the position of the
second segment (40) in said direction (26) according to a height
(h) of the product in said tank (17).
2. A machine according to claim 1, wherein the second segment (40)
is movable, with respect to the first segment, with a
rotational-translational movement along and about said axis
(6).
3. A machine according to claim 1, wherein the second segment (40)
has a substantially helical shape.
4. A machine according to claim 1 and further comprising a guiding
channel (42), which is helically wound along and about said axis
(6), and is slidingly engaged by said second segment (40).
5. A machine according to claim 1 and further comprising a second
adjustment device (47) for selectively controlling the height (h)
of the product in the tank (17).
6. A machine according to claim 5, wherein said first and second
adjustment devices (51, 53, 47) comprise corresponding actuating
motors reciprocally interconnected and phased.
7. A machine according to claim 5, wherein the second adjustment
device (47) comprises a leveling member (46) movable in said
direction (26) with respect to a bottom wall of the tank (17); said
first and second adjustment devices (51, 53, 47) comprising a
single actuating motor (51), a first drive assembly (53) for
connecting together the actuating motor (51) and the second segment
(40), and a second drive assembly (48, 49) for connecting together
the drive motor (51) and the leveling member (46).
8. A machine according to claim 7, wherein the first drive assembly
(53) comprises a drive member (60) connected to said second segment
(40) by means of a worm-helical wheel coupling.
9. A machine according to claim 1, wherein the second segment (40)
and the second cam (25) mutually cooperate to axially and
reciprocally displace the cylinder (29) and the piston (38) in said
direction (26) so as to define a metering chamber (43); the first
and second cams (35, 25) being reciprocally movable in said
direction (26) for selectively controlling a height (H) of the
metering chamber (43).
Description
[0001] The present invention relates to a machine for filling
containers with at least one powdered product.
[0002] Specifically, the present invention relates to a machine for
filling capsules with at least one powdered pharmaceutical product,
to which the following description will explicitly refer without
therefore loosing in generality.
BACKGROUND OF THE INVENTION
[0003] In the pharmaceutical industry, a machine for filling
capsules with at least one powdered pharmaceutical product is known
comprising a conveying device, which is continuously movable along
a given path, and is provided with a plurality of pockets, each
adapted to receive a corresponding bottom shell of a corresponding
capsule; a rotating container for the product; and a metering wheel
mounted to continuously rotate about a longitudinal axis
thereof.
[0004] The metering wheel is provided with a plurality of metering
devices, each of which is fed by the metering wheel firstly through
a withdrawal station of a given amount of product from the
container and then along a portion of the aforesaid path phased
with a corresponding pocket for transferring the product into the
corresponding bottom shell.
[0005] Each metering device comprises a cylinder and a piston
axially movable under the bias of an actuating device comprising,
in turn, a first and a second cam extending about the longitudinal
axis of the metering wheel, a first tappet mounted on the piston
and engaged in the first cam, and a second tappet mounted on the
cylinder and engaged in the second cam.
[0006] The first cam comprises a first segment parallel to the
second cam so as to displace the cylinder and piston with
reciprocally identical laws of motion, and at least one second
segment, which is obtained in a block removably connected to the
first segment at the withdrawal station, and is horizontally and
differently oriented from the second cam to keep the piston on the
upper surface of the product contained in the tank during the
insertion of the cylinder in the product itself.
[0007] The stop of the piston at the upper surface of the product
allows to avoid the presence of air inside a metering chamber
defined between the piston and the cylinder during the insertion of
the cylinder in the product itself.
[0008] Since the height of the product contained in the tank is
selectively adjusted according to the chemical-physical features of
the product and/or to the amount of the product which is to be
withdrawn by the corresponding metering devices, the adjustment of
the height of the product in the tank implies replacing the
aforesaid block each time with a new block shaped to stop the
piston at the new height of the product in the tank.
[0009] The known machines of the above-described type thus display
several drawbacks mainly deriving from the fact that the
replacement of the blocks implies the availability and the storage
of a relatively high number of blocks, severe operative
difficulties for the operating personnel, and relatively long
equipping times of the machines, and further allows to only
discretely vary the height of the product contained in the
tank.
SUMMARY OF THE INVENTION
[0010] It is the object of the present invention to provide a
machine for filling containers with at least one powdered product,
which is free from the above-described drawbacks.
[0011] According to the present invention, there is provided a
machine for filling containers with at least one powdered product
as claimed in the attached claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will now be described with reference
to the accompanying drawings, which disclose a non-limitative
embodiment thereof, in which:
[0013] FIG. 1 is a schematic side view, with parts in section and
parts removed for clarity, of a preferred embodiment of the machine
of the present invention;
[0014] FIG. 2 is a schematic perspective view, with parts removed
for clarity, of the machine in FIG. 1;
[0015] FIG. 3 is a schematic longitudinal section of a first detail
of the machine in FIGS. 1 and 2;
[0016] FIG. 4 is a schematic plane development of a second detail
of the machine in FIGS. 1 and 2;
[0017] FIG. 5 is similar to FIG. 4 and shows the detail in FIG. 4
in three different operative positions; and
[0018] FIG. 6 schematically shows the operating principle of the
machine in FIGS. 1 and 2.
DETAILED DESCRIPTION OF THE INVENTION
[0019] With reference to FIGS. 1, 2 and 3, numeral 1 indicates as a
whole a machine for filling capsules 2 of a known type with a
powdered pharmaceutical product. Each capsule 2 comprises a
substantially cup-shaped bottom shell 3 and a top shell (not shown)
fitted onto the bottom shell 3 itself.
[0020] The machine 1 includes a metering wheel 4, in turn
comprising a tubular vertical upright 5, which has a longitudinal
axis 6, extends upwards from a fixed frame 7 of the machine 1, and
is engaged by a shaft 8, which extends inside the upright 5
coaxially with axis 6, and is rotationally coupled to the upright 5
to continuously rotate, with respect to the upright 5 itself and
under the bias of an actuating device 9 of a known type, about axis
6.
[0021] The shaft 8 supports a feeding drum 10 including a
substantially cylindrical casing 11, which is coaxial with the axis
6, is arranged with the concavity thereof facing downwards, is
laterally bounded by a wall 12 extending about the upright 5, and
is closed at the top by a bottom wall 13, which is substantially
orthogonal to the axis 6, and is fixed to one end of the shaft 8
projecting outwards of the upright 5.
[0022] On the external surface of the wall 12 a sprocket 14
defining part of a chain conveyor 15 of a known type is obtained,
which is looped about a plurality of sprockets (of which only
sprocket 14 is shown in FIGS. 1 and 3) actuated by the device 9,
and is provided with a plurality of cup-shaped pockets 16 which
have an upward-facing concavity, are uniformly distributed along
the conveyor 15, are each adapted to accommodate a corresponding
bottom shell 3 arranged with the concavity thereof facing upwards,
and are continuously fed by the conveyor 15 itself along a given
path P.
[0023] The wheel 4 further comprises an annular container 20, which
contains the powdered pharmaceutical product therein, and which
extends over the sprocket 14 and is rotationally coupled to the
frame 7 to continuously rotate, with respect to the frame 7 itself
and under the bias of an actuating device of a known type (not
shown), about a corresponding longitudinal axis 18 parallel to the
axis 6, at an angular speed which substantially differs from the
angular speed of the drum 10 and, therefore, of the sprocket
16.
[0024] The drum 10 is provided with a plurality of metering devices
19, which are uniformly distributed about the axis 6, and are
continuously fed by the drum 10 about the axis 6 itself. Each
device 19 is fed by the drum 10 firstly through a withdrawal
station 20, wherein the device 19 withdraws a given amount of
product from the container 17, and thus phased with a corresponding
pocket 16 along a segment of the path P extending through a filling
station 21, wherein the device 19 transfers the product into the
corresponding bottom shell 3.
[0025] Each device 19 comprises a substantially cylindrical sleeve
22, which has a longitudinal axis 23 substantially parallel to the
axis 6, extends through the casing 11, is coupled in an axially
sliding manner to the casing 11, and is provided with a tappet
roller 24, which engages a cam 25 extending about the axis 6 and
allows to selectively control the position of the sleeve 22 in a
direction 26 parallel to the axes 6 and 18.
[0026] The sleeve 22 is further coupled in an angularly fixed
manner to the drum 10 by means of a tappet roller 27, which is
mounted on the sleeve 22, and is engaged in a corresponding slot 28
obtained through the casing 11 parallelly to the direction 26 to
prevent the sleeve 22 from rotating about the axis 23. Furthermore,
the sleeve 22 supports, at an upper end thereof, a cylinder 29 by
the side of the sleeve 22 and having a longitudinal axis parallel
to the axis 23.
[0027] The device 19 further comprises a shaft 31, which is fitted
inside the sleeve 22 coaxially to the axis 23, is slidingly coupled
to the sleeve 22 to perform, with respect to the sleeve 22 itself,
rectilinear displacements in the direction 26, and has a lower end
32, which protrudes at the bottom from the sleeve 22 in the
direction 26, and is fluid-tightly coupled with a pneumatic chamber
33 connected to a compressed air feeding device (known and not
shown).
[0028] The shaft 31 is displaced in the direction 26 by means of a
tappet roller 34, which is mounted on the shaft 31, and is kept in
contact with a cam 35 extending about the axis 6 parallelly to the
cam 25 under the upward bias exerted on the shaft 31 by the
compressed air fed to the chamber 33.
[0029] According to a variant (not shown) , the roller 34 is kept
in contact with the cam 35 by means of at least one spring arranged
between the sleeve 22 and the shaft 31.
[0030] Each shaft 31 is further coupled in an angularly fixed
manner to the drum 10 by means of a tappet roller 36, which is
mounted on the shaft 31, and is engaged in the corresponding slot
28 to prevent the shaft 31 itself from rotating about the axis
23.
[0031] At the upper end of the shaft 31 , by means of the
interposition of a supporting bracket 37, a substantially
cylindrical piston 38 is fixed, which protrudes downwards from the
bracket 37, engages in a sliding manner the corresponding cylinder
29, and has a diameter rounding down the diameter of the cylinder
29 itself.
[0032] The operation of the machine 1 will now be described with
reference to FIGS. 3 and 6, assuming the filling of only one bottom
shell 3, and starting from a moment in which the corresponding
metering device 19 has been fed to the withdrawal station 20 (FIGS.
3 and 6a) and faces the container 17.
[0033] By combining the displacement of the device 19 considered
about the axis 6 with the action of the cams 25, 35, the cylinder
29 and the piston 38 are lowered in the direction 26 at the station
20 with laws of motion which are substantially identical to each
other, so as to be arranged in contact with the upper surface of
the product contained in the container 20 (FIG. 6a).
[0034] At this point, the piston 38 is kept in contact with the
upper surface of the product by engaging a tappet roller 39 mounted
on the shaft 31 in a substantially horizontal cam 40 obtained along
a lower edge of a block 41, which has a helical shape, extends
about the axis 6, and slidingly engages a guiding channel 42
helically wound about the axis 6 itself. In other words, upon the
rotation of the metering wheel 4 about the axis 6, the roller 39
engages the cam 40 causing the disengagement of the roller 34 from
the cam 35 and interrupting the descent of the piston 38 (FIG. 6a
and 6b).
[0035] At the same time, the cylinder 29 is lowered into the
product by means of the cam 25 so as to delimit a metering chamber
43, which has a height H corresponding to the correct amount of
product to be withdrawn, and is formed keeping the piston 38
substantially in contact with the upper surface of the product to
avoid the presence of air within the chamber 43 itself (FIG.
6b).
[0036] After delimiting the chamber 43, the roller 39 disengages
the cam 40 allowing the roller 34 to engage the cam 35 again and
the cams 25, 35 to lower the cylinder 29 again and, respectively,
the piston 38 with laws of motion which are substantially identical
to each other, and to displace the cylinder 29 substantially in
contact with the bottom wall of the container 17 (FIG. 6c).
[0037] The piston 38 is then further lowered with respect to the
cylinder 29 in the direction 26 to compact the product contained in
the chamber 43 (FIG. 6c) . The lowering of the piston 38 is
obtained by engaging the roller 39 in a cam 44 and consequently
releasing the roller 34 from the cam 35.
[0038] At this point, by combining the displacement of the device
19 about the axis 6 with the action of the cams 25, 35 and with the
eccentric assembly of the container 17 with respect to the drum 10,
the device 19 is raised in the direction 26, is extracted from the
container 17, and is fed in phase with a corresponding pocket 16
through the filling station 21, at which the cylinder 29 and the
piston 38 face the pocket 16 and, thus, the corresponding bottom
shell 3 (FIG. 6d).
[0039] Finally, the piston 38 is lowered again with respect to the
cylinder 29 in the direction 26 to transfer the product from the
chamber 43 into the bottom shell 3 (FIG. 6e) . The lowering of the
piston 38 is obtained by engaging the roller 39 in a cam 45 mounted
at the station 21 and consequently releasing the roller 34 from the
cam 35.
[0040] With reference to FIGS. 1 and 4, the powdered pharmaceutical
product is fed into the container 17 by means of a feeding hopper
46, which is inserted in a container 17, has the shape of a
circular sector extending about the axis 18, is open at the bottom,
is coupled in an angularly fixed manner to the frame 7, and is
further slidingly coupled to the container 17 for performing, with
respect to the container 17 itself, rectilinear displacements in
the direction 26.
[0041] Furthermore, the hopper 46 defines a leveling element of the
product inside the container 17, and is thus arranged at a distance
from the bottom wall of the container 17 equal to a height h of the
product in the container 17 itself.
[0042] The position of the hopper 46 in the direction 26 and, thus,
the height h of the product in the container 17, are selectively
controlled according to the chemical-physical features of the
product and/or to the amount of product which is to be withdrawn by
the metering devices 19 by means of an actuating device 47
comprising a substantially flat and horizontal supporting bracket
48, which is slidingly coupled to the frame 7, and is further
coupled by means of a screw/nut-screw coupling to a screw 49, which
extends in the direction 26, and is coupled to an outlet shaft 50
of an electric motor 51 by means of the interposition of a pair of
gears 52 so as to rotate under the propulsion of the motor 51 and
to impart rectilinear displacements in the direction 26 to the
bracket 48.
[0043] The adjustment of the position of the hopper 46 in the
direction 26 and, thus, of the height h of the product in the
container 17 necessarily implies a corresponding adjustment of the
position of the piston 38 in the direction 26 so as to keep the
piston 38 always substantially in contact with the upper surface of
the product, regardless of the height h, when forming the metering
chamber 43 (FIGS. 6a and 6b).
[0044] With this regard, the block 41 is displaced along the
guiding channel 42 by means of a drive assembly 53 interposed
between the motor 51 and the block 41 and comprising two driving
shafts 54, 55, which are mounted with respect to the frame 7 to
rotate about corresponding longitudinal axes 56 parallel to the
direction 26, and are reciprocally connected by means of a drive
belt 57 extending on a horizontal plane substantially orthogonal to
the direction 26 itself.
[0045] The shaft 54 is coupled to the outlet shaft 50 of the motor
51 by means of a pair of gears comprising the gear 52 mounted on
the shaft 50 and a gear 58 mounted on the shaft 54, while the shaft
55 is coupled by means of a pair of bevel gears 59 to a screw 60,
which extends transversally with respect to the direction 26, and
is coupled to the block 41 by means of a worm-helical wheel
coupling.
[0046] From the above, it is apparent that the actuation of the
motor 51 implies the adjustment of the position of the hopper 46 in
the direction 26 and, thus, of the height h of the product in the
container 17 and, at the same time, the adjustment of the position
of the block 41 along the guiding channel 42 (FIG. 5), of the
position of the cam 40 in the direction 26, and, therefore, of the
position of the piston 38 when forming the metering chamber 43.
[0047] Obviously, according to a variant (not shown), the drive
assembly 53 is eliminated and replaced by an electric actuating
motor of the screw 60 interconnected to and phased with the motor
51.
[0048] Furthermore, it is worth noting that the cam 35 is slidingly
coupled to the cam 25 to perform rectilinear displacements in the
direction 26 with respect to the cam 25 and under the bias of an
actuating device (known and not shown), and to selectively control
the height H of the metering chambers 43.
[0049] The machine 1 thus allows to selectively and continuously
control the position of the piston 38 in the direction 26 when
forming the metering chamber 43 according to the height h of the
product in the container 17 by means of a single block 41.
* * * * *