U.S. patent application number 09/905409 was filed with the patent office on 2003-01-16 for apparatus and method for automatic bag loading.
Invention is credited to Germunson, Gary G., Main, Timothy B..
Application Number | 20030009990 09/905409 |
Document ID | / |
Family ID | 25420763 |
Filed Date | 2003-01-16 |
United States Patent
Application |
20030009990 |
Kind Code |
A1 |
Main, Timothy B. ; et
al. |
January 16, 2003 |
Apparatus and method for automatic bag loading
Abstract
An apparatus and method for automatic opening of bags uses bags
in a folded configuration that include a small aperture near the
top thereof. The aperture allows a number of bags to be hung in a
substantially vertical orientation on an angled protruding member.
A vacuum-operated device engages one side of one of the bags and
extracts it from the protruding member. The bag, still in the
folded configuration, is moved into position opposite a second
vacuum-operated device. The second vacuum-operated device engages
the extracted bag on the opposite side of the bag from the first
vacuum-operated device. The second vacuum-operated device is
activated and one or both of the vacuum-operated devices are moved
away from each other to open the bag into an unfolded
configuration. The unfolded bag may be positioned in a loading area
by synchronized movement of both vacuum-operated devices.
Inventors: |
Main, Timothy B.; (US)
; Germunson, Gary G.; (US) |
Correspondence
Address: |
DAVIS WRIGHT TREMAINE, LLP
2600 CENTURY SQUARE
1501 FOURTH AVENUE
SEATTLE
WA
98101-1688
US
|
Family ID: |
25420763 |
Appl. No.: |
09/905409 |
Filed: |
July 13, 2001 |
Current U.S.
Class: |
53/459 ;
53/570 |
Current CPC
Class: |
B65B 43/30 20130101 |
Class at
Publication: |
53/459 ;
53/570 |
International
Class: |
B65B 043/26 |
Claims
What is claimed is:
1. A bag loading apparatus for use with bags having an aperture
therein, comprising: a protruding member sized to fit through the
aperture in the bags and thereby retain the bags in a substantially
vertical orientation; a first vacuum-operated device having an
operating surface to engage a first one of the bags on a first side
of the bag and thereby extract the first bag from the protruding
member; and a second vacuum-operated device having an operating
surface opposed to the operating surface of the first
vacuum-operated device to engage the first bag on a second side of
the bag and thereby open the first bag.
2. The apparatus of claim 1 wherein the first vacuum-operated
device operating surface comprises first and second suction cups to
engage the first side of the first bag.
3. The apparatus of claim 1 wherein the second vacuum-operated
device operating surface comprises first and second suction cups to
engage the second side of the first bag.
4. The apparatus of claim 1 wherein the protruding member is
cylindrical.
5. The apparatus of claim 1 wherein the protruding member projects
at an upward orientation.
6. The apparatus of claim 1, further comprising a cutting edge
associated with the protruding member to cut the first bag from the
protruding member.
7. The apparatus of claim 1 wherein the first vacuum-operated
device is moveably mounted to permit movement toward the first side
of the first bag and thereby permit engagement of the first side of
the first bag by the first vacuum-operated device operating
surface.
8. The apparatus of claim 1 wherein the first vacuum-operated
device is moveably mounted to permit movement toward the second
vacuum-operated device and thereby permit engagement of the second
side of the first bag by the second vacuum-operated device
operating surface.
9. The apparatus of claim 1, further comprising a first support
member to which the first vacuum-operated device is moveably
mounted wherein the first vacuum-operated device extracts the first
bag from the protruding member and is laterally displaced along the
first support member into alignment with the second vacuum-operated
device.
10. The apparatus of claim 9, further comprising a second support
member to which the second vacuum-operated device is slidably
mounted wherein the second vacuum-operated device opens the first
bag and the first and second vacuum-operated devices are laterally
displaced along the first and second support members, respectively,
into alignment with a loading position to permit loading of the
first bag.
11. The apparatus of claim 1 wherein the bags each have first and
second ends with the second end being sealed and the first end
being unsealed to permit loading of the bag when open, the aperture
being located proximate the first end of the bag.
12. The apparatus of claim 1 wherein the bags each have first and
second ends with the second end being sealed and the first end
being unsealed to permit loading of the bag when open, the aperture
being located proximate the first end of the bag.
13. A method for automatically loading a bag for use with bags
having an aperture therein, comprising: hanging the bags on a
protruding member sized to fit through the aperture in the bags;
engaging a first one of the bags on a first side of the bag and
thereby extracting the first bag from the protruding member;
engaging the first bag on a second side of the bag and thereby
opening the first bag; and loading the open first bag.
14. The method of claim 13 wherein engaging the first bag comprises
activating a first vacuum-operated device to engage the first side
of the first bag and thereby extract the first bag from the
protruding member.
15. The method of claim 14 wherein activating the first
vacuum-operated device comprises activating first and second
suction cups to engage the first side of the first bag.
16. The method of claim 13 wherein engaging the second side of the
first bag comprises activating a second vacuum-operated device to
engage the second side of the first bag.
17. The method of claim 16 wherein activating the second
vacuum-operated device comprises activating first and second
suction cups to engage the second side of the first bag.
18. The method of claim 13 wherein extracting the first bag
comprises using a cutting edge to cut through a portion of the
first bag and thereby extract the first bag from the protruding
member.
19. The method of claim 13 engaging the first side of the first bag
comprises moving a first vacuum-operated device toward the first
side of the first bag and thereby permit engagement of the first
side of the first bag by the first vacuum-operated device.
20. The method of claim 13 extracting first bag comprises moving a
first vacuum-operated device away from the first side of the first
bag following engagement of the first side of the first bag by the
first vacuum-operated device to thereby extract the first bag from
the protruding member.
21. The method of claim 13 wherein engaging the second side of the
first bag comprises moving a first vacuum-operated device, in
engagement with the first side of the extracted first bag, toward a
second vacuum-operated device to thereby permit engagement of the
second side of the first bag by the second vacuum-operated
device.
22. The method of claim 13 wherein engaging the second side of the
first bag comprises moving the extracted first bag, in engagement
with a first vacuum-operated device, into alignment with a second
vacuum-operated device to permit engagement of the second side of
the first bag by the second vacuum-operated device.
23. The method of claim 13 wherein opening the first bag comprises
moving a first vacuum-operated device, in engagement with the first
side of the extracted first bag, away from a second vacuum-operated
device, in engagement with the second side of the extracted first
bag, to thereby open the first bag.
24. The method of claim 13 wherein loading the open first bag
comprises moving the extracted first bag, in engagement with a
first vacuum-operated device on the first side and in engagement
with a second vacuum-operated device on the second side into a
loading position.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Technical Field
[0002] The present invention is related generally to bag loading
and, more particularly, to an apparatus and method for automatic
bag loading.
[0003] 2. Description of the Related Art
[0004] Automated processes for package loading are desirable since
it decreases labor costs and increases production efficiency. For
example, there are known techniques for automatically loading
cartons of fruit, such as apples. As noted above, automatic loading
of cartons of fruit reduces labor costs and thus the cost of the
finished product. In addition, production efficiency is greatly
increased by such automated processing.
[0005] Despite the desirability of automated processing, not all
processes have been automated. In one example, prepackaged bags of
products, such as potatoes, are placed in a large shipping bag
called a bale. In one example, a bale contains five individual 10
lb. bags of potatoes. Previous attempts to automate the bale
loading process have been unsuccessful. Therefore, it can be
appreciated that there is a significant need for an automatic
process for loading bales. The present invention provides this and
other advantages as will be apparent from the following detailed
description and accompanying figures.
BRIEF SUMMARY OF THE INVENTION
[0006] The present invention is embodied in an apparatus and method
for bag loading. The apparatus is for use with bags having an
aperture therein and comprises a protruding member sized to fit
through the aperture in the bags and thereby retain the bags in a
substantially vertical orientation. A first vacuum-operated device
has an operating surface to engage a first one of the bags on a
first side of the bag and thereby extract the first bag from the
protruding member. A second vacuum-operated device has an operating
surface opposed to the operating surface of the first
vacuum-operated device to engage the first bag on a second side of
the bag and thereby open the first bag.
[0007] In one embodiment, the first vacuum-operated device
comprises first and second vacuum-actuated suction cups to engage
the first side of the first bag. The second vacuum-operated device
may also comprise first and second vacuum-actuated surfaces to
engage the second side of the first bag.
[0008] The apparatus may further comprise a cutting edge associated
with the protruding member to cut the first bag from the protruding
member when it is extracted by the first set of vacuum-operated
devices.
[0009] The bag has a first and second ends with the second end
being sealed and the first end being unsealed to permit loading of
the bag when open. In this embodiment, the aperture is located
proximate the first end of the bag.
[0010] In another embodiment, the apparatus further comprises a
first support member to which the first set of vacuum-operated
devices are slidably mounted. In this embodiment, the first set of
vacuum-operated devices extract the first bag from the protruding
member and is laterally displaced along the first support member
into alignment with the second set of vacuum-operated devices. The
apparatus may further comprise a second support member to which the
second set of vacuum-operated devices are slidably mounted. In this
embodiment, the second set of vacuum-operated devices opens the
first bag and the first and second sets of vacuum-operated devices
are laterally displaced along the first and second support members,
respectively, into alignment with a loading position to permit
loading of the first bag.
[0011] BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)
[0012] FIG. 1 is a top plan view of the inventive apparatus.
[0013] FIG. 2 is a side view illustrating details of the inventive
apparatus.
[0014] FIG. 3 is a perspective view of a bale bag used with the
inventive apparatus.
[0015] FIG. 4 illustrates the bag of FIG. 3 in an open
configuration.
[0016] FIG. 5 is a partial enlarged front elevation view of the bag
of FIG. 3.
[0017] FIG. 6 is a top plan view illustrating the manufacture of
the bag of FIG. 3.
[0018] FIG. 7 is a side view of the inventive apparatus.
[0019] FIG. 8 is a top plan view illustrating the apparatus in
operation.
[0020] FIG. 9 is a top plan view illustrating the extraction of a
bale bag.
[0021] FIG. 10 is a top plan view illustrating linear displacement
of the extracted bag.
[0022] FIG. 11 is a top plan view illustrating the engagement of
the extracted bag to open the bag.
[0023] FIG. 12 is a top plan view illustrating the activation of
the apparatus to open the extracted bag.
[0024] FIG. 13 is a top plan view of the inventive apparatus
illustrating linear displacement of the extracted opened bag into a
loading area.
DETAILED DESCRIPTION OF THE INVENTION
[0025] The present invention is directed to a technique that
automatically extracts a bag, such as a bale bag, opens the bag,
and positions the bag for loading. The present invention is
embodied in a system 100 illustrated in the top plan view of FIG.
1. As illustrated in FIG. 1, a plurality of bags 102 are placed on
a protruding member 104. In one embodiment, the protruding member
104 is a rod mounted at an upwardly projecting angle, as
illustrated in FIG. 2, to permit gravity feeding of the bags
102.
[0026] FIG. 2 is a side elevational view of the protruding member
104 illustrating its attachment to a frame 106 by a mounting
bracket 108. The mounting bracket 108 may be attached to the frame
106 using screws, nuts and bolts, rivets, or other known mechanical
attachment components. Those skilled in the art will recognize that
the protruding member 104 may be directly mounted to the frame 106
using well-known conventional techniques, such as welding,
adhesives, or the like. The protruding member 104 may have a
rounded terminal portion 104t to minimize the potential to damage
to the aperture 124 when loading the bags 102 onto the protruding
member. The rounded terminal portion 104t also makes it easier to
place the bags 102 on the protruding member 104.
[0027] A cutting blade 110 is mounted at the lowest portion of the
protruding member 104. The cutting blade 110 may be a razor blade,
knife blade, or other known device. In one embodiment, the cutting
blade 110 may be mounted in a slot (not shown) in the protruding
member 104. The cutting blade 110 may be retained within the slot
using conventional means, such as a set-screw, adhesive, or the
like. As will be described in greater detail below, the cutting
blade 110 is used to extract a bag 102 from the protruding member
104.
[0028] In one embodiment, the protruding member 104 is formed from
a circular rod. The bag 102 is similar to a conventional bale bag,
but is modified for use with the automatic system of the present
invention. The bag 102 may be formed from one or more layers of
brown paper. The bag 102 is illustrated in a folded or closed
configuration in FIG. 3. The bags 102 are folded in the manner of a
conventional grocery bag to permit ease in shipping and storage.
The bag 102 is shown in an unfolded or open configuration in FIG.
4. In the folded configuration, the dimensions of the bag 102 are
approximately 13 inches wide by 32 inches long. When in the
unfolded configuration, shown in FIG. 4, the bag has a depth of
approximately 7 inches and an opening of approximately 7 inches by
13 inches. Although the bag 102 may have the standard dimensions
described above, those skilled in the art will recognize that the
system 100 can be used with bags of virtually any dimension. The
only accommodation for bags of different size may be the relative
location of the various components of the system 100.
[0029] The bag 102 may be manufactured from a single large piece of
paper, illustrated in FIG. 5, that is cut, folded into several
panels or portions, and glued in a conventional manner. The bag 102
has left and right side portions 112l and 112r, respectively. The
bag 102 also includes front and back portions 114f and 114b,
respectively. A strip 120 projects from the right side portion
112r. The strip 120 is glued to the back portion 114b when the bag
102 is formed. The left and right side portions 112l and 112r have
flaps 121, which are used to seal the bottom of the bag 102.
Similarly, the front and back portions 114f and 114b have flaps 123
that are also used to seal and form a bottom portion 116, as
illustrated in FIG. 3.
[0030] Once the bag 102 has been cut from stock material, it may be
folded along fold lines 125 to form the front and back portions
114f and 114b and left and right side portions 112l and 112r. The
strip 120 may be glued to the back portion 114b to seal the various
portions. The bag also includes fold lines 127. The flaps 121 and
123 are folded at the fold lines 127 to form the bottom portion
116. The flaps 121 from the left and right side portions 112l and
112r are folded. The flap 123 from the front portion 114f is folded
and glued to the flaps 121. Finally, the flap 123 from the back
portion 114b is folded and glued to the flap 123 from the front
portion 114f to seal the bottom portion 116 of the bag 102. In this
manner, the bag 102 may be manufactured.
[0031] The bag 102 may be formed with creases to assist in folding
the bag following manufacture. As illustrated in FIG. 4, the bag
102 may include a front crease 122f on the front portion 114f
extending from the left side portion 112l to the right side portion
112r near the bottom 116 of the bag. The precise location of the
crease 122f is typically dependent on the dimensions of the bag.
For example, the crease 122f may be located at a distance from the
bottom portion 116 that is approximately one-half of the distance
between the front portion 114f and the back portion 114b when the
bag is in the open configuration. In addition, the bag 102 may
include creases 122l and 122r on the left and right side portions
112l and 112r, respectively. The crease 122l and 122r are located
approximately midway between the front portion 114f and the back
114b when the bag is in the open configuration. The creases 122l
and 122r extend from the top portion 118 to a point near the bottom
portion 116. The creases 122l and 122r extend to a point
approximately equal to the location of the crease 122f to
facilitate folding of the bag 102. From the terminating point of
the creases 122l and 122r, additional creases extend from the
midline of the side portions 112l and 112r to the junctions of the
side portions 1121 and 112r with the front and back portions 114f
and 114b near the bottom portion 116 of the bag 102.
[0032] The bag 102 also includes an aperture 124 in the top portion
118 of the back portion 114b. In an exemplary embodiment, the
aperture 124 is approximately 0.625 inches in diameter and is
located a short distance from the top of the back portion 114b. For
example, the aperture 124 may be spaced apart from the top of the
back portion 114b by approximately 0.25 inches. The short
separation between the aperture 124 and the top of the back portion
114b of the bag 102 permits the easy extraction of the bag from the
protruding member 104. In one embodiment, the bag 102 may be
removed from the protruding 104 simply by tearing the back portion
114b at the point of narrow separation between the back portion and
the aperture 124. The cutting blade 110 (see FIG. 2) may be used to
slice the back portion 114b at the aperture 124 thus preventing an
undesirable tear. Alternatively, the bag 102 may include a
perforated portion above the aperture to control the tearing. In
this embodiment, the cutting blade 110 can be eliminated.
[0033] In the embodiment illustrated in FIGS. 3-5, the aperture 124
is circular in shape to match the cylindrical shape of the
protruding member 104. The cylindrical shape of the protruding
member 104 and the circular aperture 124 permit easy loading of
bags 102 onto the protruding aperture. In addition, the bags 102
slide easily down the cylindrical protruding member 104.
[0034] Those skilled in the art will appreciate that the protruding
member 104 may have different shapes and that the aperture 124 may
be circular or may have a shape that corresponds to the selected
shape for the protruding member. For example, the protruding member
104 may have a semi-circular shape with a rounded portion on top
and a flat portion on the bottom. The bags 102 may still have the
circular aperture 124, as illustrated in FIGS. 3-5, or may have a
shape selected to correspond to the shape of the protruding member
104. Other shapes, such as triangular, rectangular, or the like may
also be used satisfactorily with the system 100. The present
invention is not limited by the specific geometric form of the
protruding member 104 or the aperture 124.
[0035] FIG. 5 is a fragmentary front elevational view of the bag
102 illustrating the location of the aperture 124 in the back
portion 114b of the bag. A curve cutout 126 in the front portion
114f of the bag 102 more fully exposes the aperture 124 in the back
portion 114b and allows easy insertion of the protruding member 104
through the aperture when loading the bags. The bag 102 may also
have a series of ventilation holes 129 in the front and back
portions 114f and 114b to allow ventilation of the packaged
produce.
[0036] Returning again to FIG. 1, the system 100 also includes a
set vacuum-operated suction devices 130a and 130b to engage and
extract a first bag 102 from the protruding member 104. The bags
102 are extracted from the protruding member 104 in the same
sequence in which they are placed on the protruding member (i.e.,
first on-first off). As illustrated in FIG. 1, the vacuum-operated
devices 130a-b have a terminal vacuum-operated suction cup 134a and
134b, respectively. As the vacuum-operated devices 130a-b make
contact with the bag 102, the bag is retained by virtue of the
vacuum-operated suction cups 134a-b. The vacuum-operated devices
130a-b are mounted on air cylinder slides 136a and 136b,
respectively. The air cylinder slides 136b move in a direction
indicated by a reference arrow 132 to allow the suction cups 134a-b
to engage a first of the bags 102 on the protruding member 104. The
vacuum operated devices 130a-b may be positioned to engage the bag
102 at any desirable position. In an exemplary embodiment, the
suction cups 134a-b engage a first side of the bag 102 on the back
portion 114b (see FIG. 4) near the top portion 118 at a distance of
approximately 1.5-2 inches in from the left and right sides 112l
and 112r, respectively.
[0037] The vacuum-operated devices 130a-b generate sufficient
vacuum to engage a bag on the protruding member 104, extract the
bag and support the weight of the bag. The precise vacuum level is
not critical, but must be sufficiently strong to perform the tasks
outlined above. A vacuum may be readily generated using Venturi
devices in which air is passed over the open end of a tube in order
to create a suction at a distal end of the tube. In the system 100,
the vacuum-operated devices 130a-b are commercial products
available from Vaccon Vacuum Generator.
[0038] In the embodiment illustrated in FIG. 1, a pair of
vacuum-operated devices 130a-b are used to support the bag 102. The
use of dual vacuum-operated devices provides greater stability and
relatively uniform extraction pressure on the bag 102 on both sides
of protruding member 104 such that the bag is drawn smoothly
against the cutting blade 110. Additional vacuum-operated devices
may be used to provide additional stability or if the size of the
bag 102 warrants extra support. However, if the bag 102 is
relatively small, a single vacuum-operated device may be sufficient
to extract the bag from the protruding member 104. Thus, the system
100 is not limited by the number or specific layout of the
vacuum-operated devices used to extract the bag 102 from the
protruding member 104.
[0039] In operation, the air cylinder slides 136a-b and the
vacuum-operated devices 130a-b move in the direction indicated by
the reference arrow 132 to engage the bag 102 on the protruding
member 104. Upon contact with the bag 102, the suction cups 134a-b
engage a first side of the bag (i.e., the back portion 114b) and
retain the bag. As the air cylinder slides 136a-b and the
vacuum-operated devices 130a-b move away from the protruding member
104 in the direction indicated by the reference arrow 132, a single
bag 102 is extracted from the protruding member and held in
position by virtue of the suction cups 134a-b. Thus, the system 100
is capable of automatically extracting a single bag 102 from the
protruding member 104. As the vacuum-operated device 130 moves away
from the protruding member in the direction indicated by the
reference arrow 132, the cutting blade 110 slices through a portion
of the bag 102 to allow its easy removal from the protruding
member.
[0040] The use of air cylinder slides, such as the air cylinder
slides 136a-b is well known in the art and need not be described in
greater detail herein. Alternatively, the vacuum devices 130a-b may
be moved back and forth in the direction indicated by the reference
arrow 132 through other known techniques, such as stepper motors,
servo motors, drive chains, belts, or the like. The system 100 is
not limited by the specific technique used to move the
vacuum-operated devices 130a-b in the direction indicated by the
reference arrow 132.
[0041] In addition to movement in the direction indicated by the
reference arrow 132, the vacuum-operated devices 130a-b are capable
of moving in the direction indicated by a reference arrow 138. To
permit this movement, the vacuum-operated devices 130a-b are
coupled to respective support brackets 140a and 140b. In turn, the
support brackets 140a-b are slidably coupled to a support member
142. Movement of the support brackets 140a-b and thus the
vacuum-operated devices 130a-b in the direction indicated by the
reference arrow 138 is controlled by a stepper motor (not shown).
In an exemplary embodiment, the vacuum-operated devices 130a and
130b move in unison in the direction indicated by the reference
arrow 138. The vacuum-operated devices 130a-b may be locked
together and controlled by a single stepper motor. Alternatively,
the vacuum-operated devices 130a and 130b may be independent with
the position of each of the vacuum-operated devices being
controlled by individual stepper motors.
[0042] The positioning of the vacuum-operated devices 130a-b can be
precisely controlled with stepper motors. Signals to control the
operation of the stepper motors are generated by a conventional
computer (not shown), such as a personal computer (PC), a single
board microcomputer, microcontroller, or the like. Displacement of
the vacuum-operated devices 130a-b is precisely controlled by the
number of pulses provided to the stepper motor. Alternatively, the
stepper motor may be replaced by other conventional drive means,
such as air cylinder slides, servo motors, chain drives, belt
drives, screw drives, and the like. Drive mechanisms, such as chain
drives, may use position sensing microswitches (not shown) to
control movement of the vacuum-operated devices 130a-b in the
direction indicated by the reference arrow 138. Use of such
position sensing devices are well known in the art and need not be
described in greater detail herein.
[0043] The system 100 has a second pair of vacuum-operated devices
150a and 150b that are positioned in opposition to the
vacuum-operated devices 130a-b. A suction cup 154a and 154b is
mounted at the terminal end of the vacuum-operated devices 150a-b,
respectively. As will be described in detail below, the
vacuum-operated devices 150a-b engage a bag 102 that has been
previously been extracted by the vacuum-operated devices 130a-b. As
previously described, the vacuum-operated devices 130a-b move in
the direction indicated by the reference 132 until the suction cups
134a-b engage a single bag 102 on a first side of the bag (i.e.,
the back portion 114b). The vacuum may be activated as the air
cylinder slides 136a-b are activated such that a vacuum is
established before the suctions cups 134a-b make contact with the
bag 102. Alternatively, the vacuum can be established as the
suction cups 134a-b approach the bag 102. The vacuum is activated
such that the suction cups 134a-b engage the first side of the bag
102. As the vacuum-operated devices 130a-b move away from the bags
102 in the direction indicated by the reference arrow 132, a single
bag is extracted from the protruding member 104.
[0044] Following extraction of a single bag, the vacuum-operated
devices 130a-b move in a direction indicated by the reference arrow
138 until the vacuum-operated devices are substantially aligned
with the vacuum-operated devices 150a-b. The vacuum-operated
devices 130a-b move in the direction indicated by the reference
arrow 132 toward the vacuum-operated devices 150a-b until the
suction cups 154a-b engage the second side of the bag 102 (i.e.,
the front portion 114f) opposite the vacuum-operated devices
130a-b. The vacuum-operated devices 150a-b are positioned to engage
the front portion 114f of the bag 102 on the opposite side of the
bag from the vacuum-operated devices 130a-b.
[0045] When the suction cups 154a-b have engaged the second side of
the back of the extracted bag 102, the vacuum may be activated and
the vacuum-operated devices 130a-b moved in a direction indicated
by the reference arrow 132 away from the vacuum-operated devices
150a-b to thereby unfold the bag. Alternatively, the vacuum for the
vacuum-operated devices 150a-b may be activated as the extracted
bag 102 approaches. The precise moment of activation of the
vacuum-operated devices 150a-b is not critical to satisfactory
operation of the system 100.
[0046] It should be noted that the vacuum-operated devices 150a-b
are not mounted on air cylinder slides, such as the air cylinder
slides 136a-b used to move the vacuum-operated devices 130a-b in
the direction indicated by the reference arrow 132. The
construction and operation of the system 100 are simplified by
fixing the position of the vacuum-operated devices 150a-b so that
no movement occurs in the direction indicated by the reference
arrow 132. Such an arrangement simplifies the system 100 by
eliminating need for air cylinder slides and the associated
measurement and control circuitry. However, if the system 100 is
installed in a location that limits the movement of the
vacuum-operated devices 130a-b in the direction indicated by the
reference arrow 132, it is possible to mount the vacuum-operated
devices 150a-b on air cylinder slides to permit movement in the
direction indicated by the reference arrow 132. In this embodiment,
both sets of vacuum-operated devices (i e., the vacuum-operated
devices 130a-b and 150a-b) are positioned on air cylinder slides
(e.g., the air cylinder slides 136a-b).
[0047] The vacuum-operated devices 150a-b are also capable of
movement in a second direction indicated by the reference arrow
158. The vacuum-operated devices 150a-b are coupled to support
brackets 160a and 160b. The support brackets 160a-b are slidably
connected to a support member 162 to permit movement in the
direction indicated by the reference arrow 158. Movement of the
vacuum-operated devices 150a-b in the direction indicated by the
reference arrow 158 is controlled by stepper motors. As discussed
above with respect to the vacuum-operated devices 130a-b, a single
stepper motor may be sufficient to move both vacuum-operated
devices 150a-b. In this embodiment, the vacuum-operated devices
150a-b are coupled together for movement controlled by the single
stepper motor. Alternatively, a stepper motor may be associated
with each of the vacuum-operated devices 150a and 150b.
Alternatively, the movement of the vacuum-operated devices 150a-b
in the direction indicated by the reference arrow 158 may be
controlled by other conventional techniques, such as servo motors,
air cylinder slides, chain drive, belt drive, screw drive, and the
like. The present invention is not limited by the specific form of
the drive mechanism used to control movement of the vacuum-operated
devices 150a-b in the direction indicated by the reference arrow
158.
[0048] Following engagement of the front and back portions 114f and
114b of the bag 102, the vacuum-operated devices 130a-b and the
vacuum-operated devices 150a-b move in synchronization in the
direction indicated by the reference arrows 138 and 158,
respectively. In this manner, the extracted and opened bag 102 is
moved into position at a conveyor belt 170 where the bag may be
loaded. Conventional devices are used to automatically load the
opened bag 102. A set of clamps (not shown) attached to the top of
the side portions 122l and 122r stabilize and retain the bag 102
while it is being loaded. As the product (e.g., individual bags of
potatoes) are loaded into the opened bag 102, the bottom 116 of the
bag rests on the conveyor belt 170. After the products have been
loaded into the bag 102, the side clamps (not shown) release and
the conveyer belt 170 is activated to move the loaded bag 102 out
of the loading area.
[0049] It should be noted that the sequence of opening the bag and
moving the bag to the conveyor belt 170 may be performed
interchangeably. That is, the extracted bag 102 may be unfolded and
subsequently moved to the conveyor belt 170, as described above.
Alternatively, the extracted bag 102 may be moved to the conveyor
belt 170 while still in the folded configuration (see FIG. 3). The
bag 102 may be subsequently opened into the unfolded configuration
(see FIG. 4) after arrival at the conveyor belt 170. Thus, the
present invention is not limited by the specific sequence of these
two events.
[0050] FIG. 7 is a side view of the system 100. As best seen in
FIG. 7, the vacuum-operated devices 130a-b and 150a-b are mounted
at approximately the same height, but facing towards each other. As
previously discussed, the vacuum-operated devices 130a-b and 150a-b
are coupled to support members 142 and 162, respectively, by
respective support brackets 140 and 160. In the exemplary
embodiment illustrated in FIG. 7, the support members 142 and 162
are rectangular supports that may conveniently be manufactured from
aluminum or other conventional materials. As can be seen from FIG.
7, the support members 142 and 162 each contain a channel 174. The
mounting bracket 140 is inserted in the channel 174 of the support
member 142 such that the vacuum-operated devices 130a-b may move
smoothly along the channel in a direction indicated by the
reference arrow 138 (see FIG. 1). Similarly, the support bracket
160 is inserted into the channel 174 of the support member 162 to
permit the vacuum-operated devices 150a-b to move easily along the
channel in the direction indicated by the reference arrow 158 (see
FIG. 1).
[0051] FIGS. 7-12 are top plan views of the system 100 illustrating
the positioning of the vacuum-operated devices 130a-b and 150a-b at
different stages of the process. In FIG. 8, the vacuum-operated
devices 130a-b advance in the direction indicated by the reference
arrow 132 until the suction cups 134a-b make contact with the first
bag 102 on the protruding member 104. It should be noted that the
vacuum device may be continuously activated at this step or may be
activated at any point before contacting the bag 102 or at the time
of contact of the bag. When the vacuum is activated, the suction
cups 134a-b engage and retain the first bag 102 on the protruding
member 104.
[0052] In FIG. 9, the vacuum-operated devices 130a-b move in the
direction indicated by the reference arrow 132 away from the
protruding member 104. Because the first bag 102 is held in
engagement with the suction cups 134a-b by virtue of the vacuum,
the first bag is extracted from the protruding member 104. As noted
above, the small section of the bag 102 above the aperture 124 (see
FIG. 5) is torn by the process of removal from the protruding
member 104. The cutting blade 110 (see FIG. 2) may be used to
control the extraction process by initiating the cut in the paper
just above the aperture 124. In yet another alternative embodiment,
the section of the bag 102 just above the aperture 124 may be
perforated to control the tearing process as the first bag is
extracted from the protruding member 104.
[0053] FIG. 9 illustrates the position of the vacuum-operated
devices 130a-b following the extraction of the first bag 102 from
the protruding member 104. At this point, the extracted bag 102 is
still in the folded configuration (see FIG. 3). In FIG. 10, the
vacuum-operated devices 130a-b are displaced in the direction
indicated by the reference arrow 138 until the vacuum-operated
devices are substantially aligned with the vacuum-operated devices
150a-b.
[0054] In FIG. 11, the air cylinder slides 136a and 136b are
activated to move the vacuum-operated devices 130a-b in the
direction indicated by the reference arrow 132 until the suction
cups 154a-b make contact with the second side of the extracted bag
102. It should be noted that the vacuum-operated devices 130a-b are
still activated such that the first side (i.e., the back portion
114b) of extracted bag 102 is held in position by the suction cups
134a-b. When the vacuum-operated devices 150a-b are activated, the
suction cups 154a-b engage and retain the second side (i.e., the
front portion 114f) of the extracted bag 102. As noted above with
respect to the vacuum-operated devices 130a-b, the vacuum-operated
devices 150a-b may be activated as the vacuum-operated devices
130a-b approach with the extracted bag 102 or after the suction
cups 154a-b make contact with the second side (i.e., the front
portion 114f) of the extracted bag.
[0055] In FIG. 12, the air cylinder slides 136a-b withdraw away
from the vacuum-operated devices 150a-b in the direction indicated
by the reference arrow 32. As the vacuum-operated devices 130a-b
move away from the vacuum-operated devices 150a-b, the extracted
bag 102 is opened into the unfolded configuration (see FIG. 4). The
bag 102 may be opened by moving one or both of the vacuum-operated
devices 130a-b and 150a-b away from each other. In an exemplary
embodiment, the vacuum-operated devices 150a-b are held in a
constant position while only the vacuum-operated devices 130a-b
move in the direction indicated by the reference arrow 132 away
from the vacuum-operated devices 150a-b. This process places the
extracted bag 102 in the unfolded configuration.
[0056] Alternatively, the vacuum-operated devices 150a-b also move
in the direction indicated by a reference arrow 152 away from the
vacuum-operated devices 130a-b. If both vacuum-operated devices
130a-b and 150a-b move approximately the same distance, the
extracted bag 102 is placed in the unfolded configuration (see FIG.
4) approximately centered between the support members 142 and 162.
In yet another alternative, the vacuum-operated devices 130a-b may
be held in a constant position while the vacuum-operated devices
150a-b move in a direction indicated by the reference arrow 152
away from the vacuum-operated device 130. In any of these
combinations of movement, the extracted bag 102 is placed in the
unfolded configuration.
[0057] The extracted and unfolded bag 102 is moved into position
atop the conveyor belt 170, as shown in FIG. 13. This movement is
accomplished by synchronized movement of the vacuum-operated
devices 130a-b and the vacuum-operated devices 150a-b.
Specifically, the vacuum-operated devices 130a-b move in a
direction indicated by the reference arrow 138 toward the conveyor
belt 170 at a predetermined rate of movement. At the same time, the
vacuum-operated devices 150a-b move in a direction indicated by the
reference arrow 158 toward the conveyor belt 170 at the same
predetermined rate thus maintaining the position of the suction
cups 134a-b and 154a-b with respect to the extracted and unfolded
bag 102. While at the conveyor belt 170, the unfolded bag 102 is
filled in a conventional manner. As previously discussed, a
clamping mechanism (not shown) clamps the open bag in position on
the conveyor belt 170 to permit loading. The open bag 102 is
automatically loaded with prepackaged bags of produce using a
conventional automatic loading machine (not shown).
[0058] One the clamps (not shown) have been activated to secure the
open bag 102, the process of extracting a new bag may be repeated.
That is, the vacuum is deactivated so that the vacuum-operated
devices 130a-b and 150a-b no longer support the open bag 102. The
vacuum-operated devices 150a-b return to their original starting
position. The air cylinder slides 136a-b retract and the
vacuum-operated devices 130a-b are returned to their original
position. The entire process is repeated to automatically extract
the next bag 102 from the protruding member 104.
[0059] Thus, the system 100 automatically extracts a single bag
from the protruding member 104, opens the extracted bag to an
unfolded configuration, and moves the extracted open bag into
position on the conveyor belt 170. As previously noted, it is
possible to move the extracted bag 102 into position above the
conveyor belt 170 before opening the bag. That is, the process of
opening the extracted bag 102 into the unfolded configuration (see
FIG. 4) may be performed in the sequence illustrated in FIGS. 11
and 12 or the process may be reversed such that the unopened
extracted bag 102 is first moved to the conveyor belt 170 and
opened into the unfolded configuration. In either event, the
process of extracting bags is automated by the system 100 thus
reducing labor costs and increase efficiency. In an exemplary
embodiment, the protruding member 104 is sufficiently long to hold
a large number (e.g., 50) of bags 102.
[0060] It is to be understood that even though various embodiments
and advantages of the present invention have been set forth in the
foregoing description, the above disclosure is illustrative only,
and changes may be made in detail, yet remain within the broad
principles of the invention. Therefore, the present invention is to
be limited only by the appended claims.
* * * * *