U.S. patent number 3,789,575 [Application Number 05/186,134] was granted by the patent office on 1974-02-05 for article packaging machine.
This patent grant is currently assigned to Pennwalt Corporation. Invention is credited to Charles Frederick Bross.
United States Patent |
3,789,575 |
Bross |
February 5, 1974 |
ARTICLE PACKAGING MACHINE
Abstract
A packaging machine utilizes a rotary drum having a
circumferential row of pockets formed in the peripheral surface
thereof for picking up articles from a pick-up zone, and
discharging the articles in a discharge zone. The drum contains a
plurality of pistons reciprocably confined therein; a single piston
is associated with each pocket and includes a plunger which
reciprocates into and out of its associated pocket during rotation
of the drum about a horizontal axis. A vacuum is applied to each
pocket and to the interior surfaces of its associated piston as the
pocket traverses the pick-up zone to pick up an article in the
pocket and at the same time, hold the plunger inwardly out of the
pocket; this vacuum is terminated as the pocket traverses the
discharge zone, thus allowing the article therein to be discharged,
and the plunger to descend by gravity into the pocket to assist in
the discharge if necessary.
Inventors: |
Bross; Charles Frederick
(Chicago, IL) |
Assignee: |
Pennwalt Corporation
(Philadelphia, PA)
|
Family
ID: |
22683785 |
Appl.
No.: |
05/186,134 |
Filed: |
October 4, 1971 |
Current U.S.
Class: |
53/534; 53/249;
221/211; 53/246; 53/539 |
Current CPC
Class: |
B65B
35/26 (20130101) |
Current International
Class: |
B65B
35/00 (20060101); B65B 35/26 (20060101); B65b
005/00 (); B65b 005/04 (); B65b 019/34 () |
Field of
Search: |
;53/235,236,160,166,246,303,247,249 ;221/211 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGehee; Travis S.
Assistant Examiner: Culver; Horace M.
Attorney, Agent or Firm: Sager; Edward A.
Claims
I claim:
1. An article packaging machine for picking-up a plurality of
articles from a manifold and discharging said articles into a web
having a row of web pockets formed therein, said machine comprising
a rotatably mounted drum adapted to rotate about a generally
horizontally disposed axis, means for rotating said drum
unidirectionally about said axis, said drum having a
circumferential row of drum pockets formed in the outer peripheral
surface thereof, each of said drum pockets being sized to receive a
predetermined number of articles therein, said drum including a
cylinder bore extending radially inwardly from each of said drum
pockets, said manifold having an outlet disposed adjacent said
peripheral surface of said drum to define a pick-up zone therewith,
said outlet being disposed in line with said circumferential row of
drum pockets, each of said drum pockets being adapted to rotate
past said pick-up zone to a discharge zone adjacent said web, and
vacuum control means for applying a vacuum to each of said drum
pockets while traversing said pick-up zone, and for terminating
said vacuum to each of said drum pockets while traversing said
discharge zone, said vacuum control means including valve means,
said drum being adapted to rotate with respect to said valve means,
and piston means including an annular stop to close each cylinder
bore and further including a plunger movable therewith in said
cylinder bore and associated with a drum pocket for assisting in
the discharge of articles from such drum pocket if necessary, each
piston means being movable by gravity and being held retracted by a
vacuum from said vacuum control means while its associated drum
pocket is traversing said pick-up zone.
2. An article packaging machine according to claim 1, wherein said
piston means comprises a piston reciprocably confined within each
of said cylinder bores and the plunger associated therewith is
adapted to reciprocate into and out of its associated drum pocket,
said vacuum control means including means for applying vacuum to
the interior surfaces of each said piston at substantially the same
time as vacuum is applied to its associated drum pocket and further
including means for terminating said vacuum to each said piston at
substantially the same time as vacuum is terminated to its
associated drum pocket so as to allow each said piston to descend
by gravity and thus allow said plunger to enter said drum
pocket.
3. An article packaging machine according to claim 2, wherein said
drum has a transverse bore formed about said axis and extending to
one end of said drum, each of said cylinder bores extending
radially inwardly to said transverse bore so as to communicate
therewith, said valve means comprising a circular plug having
substantially the same diameter as said transverse bore, said plug
being stationarily mounted within said transverse bore, said plug
having a vacuum passageway formed in said plug comprising an
arcuate portion formed in said plug and extending radially inwardly
from the outer periphery thereof, said arcuate portion overlying
said cylinder bores so as to periodically communicate with each of
said cylinder bores as said drum rotates about said axis.
4. An article packaging machine according to claim 3 wherein said
manifold outlet is disposed above said axis to allow said articles
to descend into said drum pockets at least partially by
gravity.
5. An article packaging machine according to claim 4, wherein said
vacuum control means includes a first passageway extending from
said transverse bore to the leading bottom portion of said drum
pocket, and a second passageway extending from said transverse bore
to the trailing bottom portion of said drum pocket.
6. An article packaging machine according to claim 3, wherein each
said cylinder bore includes a radially outwardly facing annular
shoulder for limiting the inward movement of its associated piston,
said machine further including a piston retainer removably mounted
at the outer end of said cylinder bore adjacent its respective drum
pocket for limiting the outward movement of each said pistons.
7. An article packaging machine according to claim 3, including
means for moving said web in a forward direction beneath said drum,
means operatively connected to said web moving means for rotating
said drum with said forward movement of said web moving means to
discharge said articles into said web pockets.
8. An article packaging machine according to claim 7, wherein said
drum rotating means includes a rack fixedly connected to said web
moving means, a gear adapted to rotate about said axis and disposed
in driving relation to said rack, a pawl pivotly connected to said
gear and adapted to rotate therewith, and a ratchet fixedly
connected to said drum and adapted to be driven by said pawl when
said web moving means is moved in said forward direction.
9. An article packaging machine according to claim 3, including
means for moving said web in a forward direction from a first
stationary position beneath said drum to a second stationary
position beneath said drum, and means for non-rotatingly moving
said drum forward from a first stationary position to a second
stationary position along with said manifold, and rotatingly
returning said drum from its second stationary position to said
first stationary position along with said manifold to deposit said
articles into said web pockets.
10. An article packaging machine according to claim 9, wherein said
drum and said manifold are mounted on a carriage, said carriage
being movably mounted on generally horizontally disposed support
means, and further including drive means for moving said carriage
via said support means from said first stationary position to said
second stationary position, and returning said carriage to said
first stationary position.
Description
BACKGROUND OF THE INVENTION
This invention relates in general to an ariicle packaging machine
for picking up a plurality of articles from a source, and
depositing each of the articles at a precise location.
One example of where such a machine can be utilized is in filling a
receptacle such as a "web" the latter commonly being a sheet of
plastic material having a plurality of pockets formed therein, each
pocket being sized to receive one or more of such articles. The
receptacles which are to receive the articles need not necessarily
be in the form of such a web however; they might also be bottles or
other type containers capable of receiving one or more of such
articles. After each receptacle is filled, it it generally closed
at a subsequent station to complete the packaging operation.
The problems encountered at present with such machinery revolve
around the speed of operation, reliability, and/or the complexity
thereof. As the speed of operation is increased, the reliability of
the machinery decreases; because of the increased speed of
operation of the machinery, there is increased likelihood of the
machinery not discharging the articles at the proper time or place,
or of not discharging the articles at all. To provide for more
accurate and positive discharge of the articles, more complex
machinery has been devised utilizing cams, etc., with the result
that the speed of operation may decrease; also, the more complex
machinery required a larger number of moving parts, and is
necessarily larger, the increased complexity tending to increase
maintenance problems. Typical machinery utilized at the present
time for handling articles which are to be picked up, and then
deposited or discharged at some particular location are illustrated
in U.S. Pat. Nos. 1,457,775; 2,198,976; 3,206,062; 3,387,746; and
3,533,535.
Thus, what is required is a compact machine of relatively simple
construction which is capable of rapidly and accurately picking up
a plurality of articles from a source, and depositing these
artilces into one or more receptacles or containers. Also, since a
typical environment in which such a machine might be utilized is
that of packaging tablets, pills, or capsules, it is also desirable
that such a machine be readily usable in conjunction with standard
commercial tablet counting machinery. While the present invention
is not so limited, this is the environment which will be used as an
example in discussing the operation of each of the embodiments of
the present invention.
SUMMARY OF THE INVENTION
The present invention relates to an article packaging machine which
utilizes a rotary drum which rotates about a horizontal axis. The
drum has a pluraluty of pockets formed in the outer peripheral
surface thereof, the pockets being arranged in one or more
circumferential rows.
The drum has a transverse bore formed about the axis of rotation,
and a plurality of cylinder bores formed therein, each cylinder
bore extending between a single associated drum pocket and the
transverse bore. The drum also includes two passageways extending
between each drum pocket and the transverse bore, one of the
passageways communicating with the leading bottom portion of its
associated drum pocket, and the other passageway communicating with
the trailing bottom portion of the drum pocket.
Reciprocably confined within each cylinder bore is a piston having
a plunger, the latter reciprocating into and out of its associated
drum pocket as the drum rotates about its axis of rotation.
A circular plug of substantially the same diameter as the
transverse bore is stationarily mounted therein, the former having
a vacuum passageway formed therein which includes an arcuate
portion or part which extends radially inwardly from the outer
peripheral surface of the plug. The arcuate portion overlies the
cylinder bores andd passageways leading to a circumferential row of
drum pockets, so that as the drum rotates around the plug, each
pocket and the interior surfaces of its associated piston has a
vacuum periodically applied thereto; the plug acts as a valve.
While each drum pocket traverses the outlet of a supply manifold
containing a plurality of articles, the vacuum is applied to the
pocket and its associated piston as stated above, and a
predetermined number of articles are drawn into the drum pocket,
the pocket being sized to accept only this number of articles.
Because vacuum is also applied to the interior surfaces of the
piston associated with each drum pocket, the plunger of the piston
is held radially inwardly out of the drum pocket. As the drum
pocket with its contents rotates to a lower position where it is
desired to discharge the article(s), the vacuum to the pocket and
its associated piston is terminated, thus, allowing the article(s)
to be discharged, and the plunger to descend by gravity into the
drum pocket to assist in the discharge if necessary. The drum then
continues to rotate, and as each pocket approaches the pick-up zone
once again, its associated piston reciprocates radially inwardly
due to gravity before vacuum is once again applied to the piston to
hold it in this position.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view showing an article packaging
machine in accordance with the invention being utilized in
conjunction with a standard commercial tablet counting apparatus,
and illustrating a web into which the articles are discharged.
FIG. 2 is a sectional view taken through line 2--2 of FIG. 1,
showing the details of the drum and manifold of the packaging
machine, along with the means for moving the web beneath the drum
and for driving the drum.
FIG. 3 is a sectional view taken through line 3--3 of FIG. 2
showing the interior construction of the drum.
FIG. 4 illustrates a second embodiment of the invention in which
the entire drum assembly along with the manifold is mounted upon a
carriage for horizontal movement.
FIG. 5 is a sectional view taken through line 5--5 of FIG. 4 and
illustrating the means for driving the drum, and for moving the
drum assembly and manifold in a horizontal direction.
FIGS. 6, 7 and 8 are sequential views showing various positions of
the drum and manifold assembly illustrated in FIGS. 4 and 5 during
operation of the packaging machine.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, a side elevational view of the article
packaging machine of the present invention is shown being utilized
in conjunction with a standard commercially available tablet
counting apparatus such as that manufactured by the Merrill
Division of Pennwalt Corporation in Chicago, Ill.
The article packaging machine 10 includes a manifold 12 containing
a supply of articles, and a drum 14 for picking up articles from
the manifold and discharging them at a lower discharge zone.
Manifold 12 receives the articles (tablets or capsules in the
instant illustration) from tablet counting apparatus 16, the latter
periodically starting and stopping depending upon the level or
quantity of articles contained within manifold 12.
Articles are released from an auxiliary hopper (not shown) into
primary hopper 18 of apparatus 16. A plurality of slats move
beneath hopper 18 to pick up articles therefrom, and move them
upward beneath an anti-shingling brush 20 which serves to assure
that the articles in each of the slats are not stacked on top of
each other. The slats move the articles from hopper 18 beneath
brush 20, and deliver them into manifold 12, the latter comprising
a plurality of tubes 22 (see FIG. 2 also) which deliver the tablets
to a rotary drum 14. Machine 10 utilizes vacuum to pick up articles
from manifold 12, and hold them on the outer periphery of the drum
discharging the articles into a web 24 moving beneath the drum.
Drum 14 rotates about horizontal axis 15 while picking up and
depositing the articles during the operation of the machine. In
this embodiment of the invention, axis 15 of the drum remains
stationary during the operation of the machine while web 24 is
pulled in a horizontal direction as indicated by the arrow 25; that
is, axis 15 does not move forward and rearward in a horizontal
plane during operation of the machine as it does in a second
embodiment to be discussed below. As web 24 is pulled forward in
the direction of arrow 25, the rotation of drum 14 is synchronized
therewith so that the drum rotates in a counterclockwise direction
as indicated by arrow 26 to pick up articles from manifold 12 and
deposit them into each of the pockets 28 formed in the web.
The web moving mechanism 32 moves forward from a first stationary
position to a second stationary position in the direction of arrow
25, the clamps holding the web during this forward stroke or
movement are released, and mechanism 32 is returned in the rearward
direction of arrow 30 to the first stationary position. The clamps
of mechanism 32 then once again clamp or grasp web 24 for the next
forward stroke. It is noted that drum 14 does not rotate when web
moving mechanism 32 is returning in the direction of arrow 30 to
its first stationary position. Consequently, no articles are picked
up or discharged by the drum on the rearward stroke of mechanism
32. Drum 14 picks up articles from manifold 12 only when rotating
in the counterclockwise direction indicated by arrow 26, i.e., when
web 24 is moving in the forward direction indicated by arrow
25.
The means for moving web 24 forward, includes mechanism 32 which
includes lower clamps 34, and upper clamps 36, the latter being
operated by solenoid 38. Web 24 is between clamps 34 and 36, and
moved forward a distance determined by the stroke length of
mechanism 32, after which the upper clamps 36 are released so that
mechanism 32 can be returned to its initial position where the
cycle is repeated; once again, clamps 34 and 36 grasp or clamp web
24, and move the latter in a forward direction. As web moving
mechanism 32 moves forward in the direction of arrow 25, rod 40
fixedly connected to mechanism 32 is moved forward; consequently,
rack 42, which is secured to rod 40 by means of bolts 41, is also
moved forward. As rack 42 moves in a forward direction, it rotates
gear 44 in a counterclockwise direction as indicated by arrow 26 in
FIG. 1. As gear 44 moves in a counterclockwise direction pawl 46,
which is pivotedly connected to the gear, engages the teeth of
ratchet 49, the latter being rigidly connected to drum 14 by being
threadly connected at 50 to plate 52, the latter being secured to
the drum by bolts 54. Thus, drum 14 is moved in a counterclockwise
direction. A spring 56 maintains contact between the pawl 46 and
ratchet 48 during rotation of the drum. Rotation of drum 14 is
terminated upon mechanism 32 reaching the end of its forward
stroke. When reaching this latter position, solenoid 38 releases
upper clamps 36, and mechanism 32 is returned to the rearward or
initial position.
During rearward movement of mechanism 32, rack 42 rotates gear 44
in a clockwise direction. Since the gear 44 is now moving in a
clockwise direction, pawl 46 is doing likewise and thus riding over
the teeth of ratchet 48 in a non-engaging manner, thus preventing
rotation of drum 14 during this rearward movement of mechanism 32.
Thus, in this embodiment, when web 24 not moving, drum 14 is not
rotating. Referring to FIG. 2, it is noted that a support member 56
having a plurality of grooves 58 formed therein, is located beneath
web 24 and supports the latter during its forward movement. Pockets
28 of the web slide in grooves 58 of the support member as the web
is moved forward. Although not shown, there is a second group of
clamps similar to clamps 34 and 36, which grasp web 24 during the
rearward movement of mechanism 32 to prevent web 24 from
accidentially being moved rearwardly also. This second group of
clamps is released when mechanism 32 reaches its most rearward or
first stationary position at the end of its rearward stroke.
Drum 14 has a transverse bore 60 formed about axis 15, and
extending inwardly from one end of the drum. Extending into
transverse bore 60 is a stationarily mounted circular plug 62
having a vacuum passageway 64 formed therein, the latter passageway
terminating with an arcuate portion 66.
Referring to FIG. 3, it can be seen that a circumferential row of
pockets 68 is formed in the outer peripheral surface of drum 14,
and that a cylinder bore 70 extends radially inwardly from each of
the drum pockets, each cylinder bore communicating with transverse
bore 60. As drum 14 rotates in a counterclockwise direction, the
leading edge 70a of each cylinder bore rotates past edge 66a of
arcuate portion 66 of the vacuum passageway formed within plug 62,
thus opening communication between the vacuum passageway and the
associated drum pocket via passageways 72 and 74.
Reciprocably confined within each cylinder bore 70 is a piston 76
having a plunger 78 which reciprocates into and out of its
associated drum pocket during rotation of drum 14. Each piston
includes an annular stop 84 which abuts against an annular shoulder
86 to limit the inward movement of the piston, and against an
annular piston retainer 87, which is removably mounted within the
cylinder bore, to limit the outward movement of the piston.
As the leading edge 68a of each drum pocket begins to rotate past
opening 82, an article 80 will begin to descend into the drum
pocket due to gravity and the vacuum which is being applied to the
drum pocket via passageway 72. The leading portion 90 of each
article is pulled into the leading bottom portion of the drum
pocket as a result of the vacuum being applied to the latter
through the latter mentioned passageway. As the drum continues to
rotate, drum pocket 68 continues to traverse the pick-up zone
defined by the manifold and drum until the trailing edge 68b of the
drum pocket reaches position 88. At this position the entire
article 80 is resting within the drum pocket the trailing portion
92 of the article being pulled into the trailing bottom portion of
the drum pocket by the vacuum being applied through passageway 74.
By arranging passageways 72 and 74 as shown, each article 80 is
properly directed into each drum pocket 68.
It should also be noted that vacuum is also applied to the interior
surfaces of piston 76. This acts to hold piston 76 inwardly as each
pocket rotates from the pick-up zone to the discharge zone. When a
drum pocket 68 with article 80 therein reaches the discharge zone
where it is desired that the article be discharged, the vacuum to
the drum pocket is terminated. This is accomplished when trailing
edge 70b of the associated cylinder bore is substantially in line
with edge 66b of arcuate portion 66 so that article 80 may be
discharged via the force of gravity into pocket 28 of web 24. At
this point, piston 76 also descends via the force of gravity to
provide assistance in discharging the article if it is
necessary.
As drum 14 continues to rotate, piston 76 will reciprocate inwardly
once more prior to reaching the piston where the vacuum is applied
once again.
Referring to FIGS. 4 and 5, a second embodiment of the invention is
illustrated wherein the web moving mechanism moves the web forward
to a predetermined forward position while the drum and manifold are
also moved to a forward position; the sequence is timed so that the
drum and manifold arrive at the forward position either
substantially at the same time, or slightly behind the time the web
reaches its forward position.
Referring to FIG. 4, it can be seen that a motor 98 is utilized for
driving a sprocket 100, motor 98 being fixedly mounted to frame 11'
of the machine. As sprocket 100 rotates in counterclockwise
direction, chain 101 is driven in the same direction, thus rotating
a larger sprocket 102 in a counterclockwise direction. The rotation
of the latter causes crank 104 which is fixedly connected to a
shaft 105 on which sprocket 102 is mounted, to rotate in a
counterclockwise direction; this causes follower 106 to ride in
slot 108 of crank 110, causing the latter to rotate in a
counterclockwise direction about axis 111 which causes crank 112 to
move in a forward direction by means of being connected at 113 to
crank 110. Carriage 114, thus moves forward in a horizontal
direction because crank 112 is pivotly connected to the carriage
114 at point 115. The carriage is guided by supporting guide rods
117 to its extreme forward position as determined by the stroke of
the crank arrangement 104-110-112.
Since the manifold 12' and 14' are mounted on carriage 114, each is
moved in a forward direction, gear 44' rotating in a clockwise
direction as it moves over rack 42', the latter being stationarily
mounted to frame 11' of the machine. As gear 44' rotates in a
clockwise direction, pawl 46' rides over the teeth of ratchet 48'
thus allowing drum 14' to move forward without rotating. After drum
14' reaches it extreme forward position as determined by the crank
mechanism, the drum will be returned to its rearward position, thus
rotating gear 44' over rack 42' and causing the former to rotate in
a counterclockwise direction. This causes pawl 46' which is pivotly
connected to gear 44' to also rotate in a counterclockwise
direction and drivingly engage the teeth of ratchet 48', thus
rotating drum as carriage 114 returns to its rearward position and
discharging articles into pockets 28' of web 24'. The construction
of drum 14' and the means for rotating the same are identical to
that shown in FIGS. 1-3. Thus, it can be seen that forward movement
of carriage 114 moves the drum and manifold forward without
rotating the drum; the discharge portion of the cycle is on the
return or rearward stroke of carriage 114 which acts to rotate drum
14' in a counterclockwise direction to pick-up and deposit articles
into web 24'. At the completion of the rearward stroke of carriage
114, the web moving mechanism is once again moved forward
simultaneously with the forward stroke of carriage 114, the latter
reaching the end of its forward stroke substantially at the same
time, or slightly behind the time that web moving mechanism 32'
reaches its extreme forward position. The web moving mechanism 32'
is similar to that shown in FIGS. 1 - 3, and its operation is
synchronized wth the operation of drum 14'.
The operation of the machine is shown more clearly in FIGS. 6, 7
and 8. FIG. 6 illustrates carriage 114 at position A prior to
beginning its forward stroke; during the forward stroke, gear 44'
is rotated over rack 42', thus causing the former to rotate about
horizontal axis in a clockwise direction and causing pawl 46' to
ride over the teeth of ratchet 48', thus preventing rotation of
drum 15' during the forward stroke or movement of carriage 114. As
previously noted, web moving mechanism 32' will reach the end B' of
its forward stroke substantially at the same time as or prior to
the time carriage 114 reaches the end B of its forward stroke.
Once carriage 114 has reached the end B of its forward stroke
rearward or return movement of the carriage causes gear 44' to
rotate in a counterclockwise direction, thus picking up articles
from manifold 12', and depositing them into pockets 28' of web 24'
as illustrated by the arrows 120. This operation or sequence
operates in the same respect as that illustrated in FIG. 3; that is
the pockets of drum 14' rotate past the pick up zone to receive
articles 80 from the outlet of the manifold; drum 14' then
continues to rotate in a counterclockwise direction until reaching
the discharge zone where the vacuum to each of the drum pockets is
terminated to release the article into a web pocket while receiving
additional assistance if necessary from piston 76 to positively
discharge the article into its associated web pocket. The entire
operation must be timed so that web 24' is stationary while the
carriage 114 is moving in a rearward direction to discharge the
articles. However, at the completion of rearward stroke of carriage
114 the web advancing mechanism is again returned to its extreme
rearward position A' to grasp the web and move it forward to its
extreme forward position B'.
In both embodiments described herein, the operation of the drum is
synchronized with that of the web moving mechanism, and the spacing
between ajacent drum pockets in a circumferential row must be
coordinated with the spacing between adjacent web pockets in a
row.
* * * * *