U.S. patent number 3,833,110 [Application Number 05/299,351] was granted by the patent office on 1974-09-03 for article-spacing helix assistor.
This patent grant is currently assigned to Owens-Illinois, Inc.. Invention is credited to Darius O. Riggs.
United States Patent |
3,833,110 |
Riggs |
September 3, 1974 |
ARTICLE-SPACING HELIX ASSISTOR
Abstract
Apparatus for holding articles in contact with an
article-spacing helix and for preventing retrograde motion of the
articles while in contact with the helix. Articles such as cans or
bottles are frequently placed in a uniformly-spaced single file by
a rotating helix, which engages the articles one-at-a-time and
advances them through the helix. The articles are furnished to and
removed from the helix by a moving, endless conveyor. In order to
hold the articles in contact with the helix and to prevent any
rearward slippage of the articles once contact has been made, a
restraining means is provided opposite the helix. The restraining
means may be a plurality of equally spaced sheets of a resilient
material angled in the direction of flow of the articles and
extending into the path of travel of the articles. As the articles
contact the sheets, the sheets bend in a cantilevered mode and
exert a force toward the helix, keeping the article in contact with
the helix. The sheets then return to their normal, unstressed
condition after the article passes. If an article slips and
attempts to move backward, the sheet over which it had previously
passed will contact the article edge on. The sheet has substantial
resistance to bending from forces applied to its edge, and thus
will restrain the article from reverse travel until it can again
properly engage the helix.
Inventors: |
Riggs; Darius O. (Ottawa Lake,
MI) |
Assignee: |
Owens-Illinois, Inc. (Toledo,
OH)
|
Family
ID: |
23154410 |
Appl.
No.: |
05/299,351 |
Filed: |
October 20, 1972 |
Current U.S.
Class: |
198/459.4;
198/836.3; 198/467.1; 198/670 |
Current CPC
Class: |
B65G
21/209 (20130101); B65G 47/28 (20130101); B65G
21/2072 (20130101); B65G 2207/42 (20130101) |
Current International
Class: |
B65G
21/20 (20060101); B65G 47/28 (20060101); B65g
047/26 () |
Field of
Search: |
;198/22R,22B,34A,167 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Schacher; Richard A.
Assistant Examiner: Thomson; Richard K.
Attorney, Agent or Firm: McLary; Steve M. Holler; E. J.
Claims
What I claim is:
1. Apparatus for controllably, uniformly spacing articles in a
single file comprising, in combination: an endless moving conveyor
for transporting a plurality of articles in a single file; a
rotating article-spacing helix located adjacent one side of said
endless conveyor, said helix forming a plurality of spaced,
article-engaging flights; a mounting block mounted adjacent said
conveyor in opposed relationship to said helix; a plurality of
contacting mounting pads integrally formed on the face of said
mounting block facing said helix in a sawtooth pattern, each of
said mounting pads having an angled attachment face inclined toward
the direction of movement of said articles; and a plurality of
flexible article-guiding members, one of said guiding members being
fixed to the attachment face of each of said mounting pads,
extending into the path of travel of said articles through said
helix.
2. The apparatus of claim 1, wherein said flexible article-guiding
members are substantially rectangular sheets of a resilient
material having length and height dimensions that are substantial
with respect to the thickness thereof, and further including a
locating notch portion on each mounting pad located behind an
adjacent mounting pad.
3. Apparatus for controllably, uniformly spacing articles in a
single file comprising, in combination: an endless moving conveyor
for transporting a plurality of articles in a single file; a
rotating article-spacing helix located adjacent one side of said
endless conveyor, said helix forming a plurality of spaced,
article-engaging flights; a pair of support brackets each having an
upper and a lower rod receiving hole drilled therethrough, said
holes being parallel and in horizontal alignment, one of said
brackets being positioned adjacent said conveyor opposite the
entrance area of said helix and the other one of said brackets
being positioned adjacent said conveyor opposite the exit area of
said helix; an upper rod extending through the upper holes in said
brackets; a lower rod extending through the lower holes in said
brackets; a plurality of guide carriers each having a notched
portion in one face thereof and each having an upper angled hole
and a lower angled hole parallel to said upper hole, drilled
through said guide carrier extending between the face of said guide
carrier having said notched portion and the face opposite thereto,
said guide carriers being placed with said upper rod passing
through said upper holes and said lower rod passing through said
lower holes with the angle of inclination of said holes acting to
point said notched portions toward the direction of flow of said
articles; and a plurality of flexible article-guiding members, one
of said guiding members being attached to the notched portion of
each of said guide carriers, extending into the path of travel of
said articles through said helix.
4. The apparatus of claim 3, wherein said flexible article-guiding
members are substantially rectangular sheets of a resilient
material having length and height dimensions that are substantial
with respect to the thickness thereof; and wherein each of said
guide carriers further includes a convex face and a concave face,
said convex face being the face of said guide carriers containing
said notched portion, said notched portion following the curvature
of said face, and said concave face being the face opposite said
convex face, said upper and lower angled holes extending between
said convex and said concave faces.
5. The apparatus of claim 4, further including means for holding
said plurality of guide carriers in a fixed position on said rods;
and means for holding said rods in a fixed position in said
brackets.
6. In an appartus for placing articles in a uniformly-spaced single
file, wherein articles are transported on an endless moving
conveyor in a non-uniform single file to a rotating article-spacing
helix, which spaces the articles a uniform distance apart, and
wherein said conveyor removes said uniformly-spaced single file of
articles from said helix, the improvement which comprises: a
mounting block mounted adjacent said conveyor in opposed
relationship to said helix; a plurality of contacting mounting pads
integrally formed on the face of said mounting block facing said
helix in a sawtooth pattern, each of said mounting pads having an
angled attachment face inclined toward the direction of movement of
said articles; and a plurality of flexible article-guiding members,
one of said guiding members being fixed to the attachment face of
each of said mounting pads, extending into the path of travel of
said articles through said helix.
7. The apparatus of claim 6, wherein said flexible article-guiding
members are substantially rectangular sheets of a resilient
material having length and height dimensions that are substantial
with respect to the thickness thereof, and further including a
locating notch portion on each mounting pad located behind an
adjacent mounting pad.
8. In an apparatus for placing articles in a uniformly-spaced
single file, wherein articles are transported on an endless moving
conveyor in a non-uniform single file to a rotating article-spacing
helix, which spaces the articles a uniform distance apart, and
wherein said conveyor removes said uniformly-spaced single file of
articles from said helix, the improvement which comprises: a pair
of support brackets each having an upper and a lower rod receiving
hole drilled therethrough, said holes being parallel and in
horizontal alignment, one of said brackets being positioned
adjacent said conveyor opposite the entrance area of said helix and
the other one of said brackets being positioned adjacent said
conveyor opposite the exit area of said helix; an upper rod
extending through the upper holes in said brackets; a lower rod
extending through the lower holes in said brackets; a plurality of
guide carriers each having a notched portion in one face thereof
and each having an upper angled hole and a lower angled hole
parallel to said upper hole, drilled through said guide carrier
extending between the face of said guide carrier having said
notched portion and the face opposite thereto, said guide carriers
being placed with said upper rod passing through said upper holes
and said lower rod passing through said lower holes with the angle
of inclination of said holes acting to point said notched portions
toward the direction of flow of said articles; and a plurality of
flexible article-guiding members, one of said guiding members being
attached to the notched portion of each of said guide carriers,
extending into the path of travel of said articles through said
helix.
9. The apparatus of claim 8, wherein said flexible article-guiding
members are substantially rectangular sheets of a resilient
material having length and height dimensions that are substantial
with respect to the thickness thereof; and wherein each of said
guide carriers further includes a convex face and a concave face,
said convex face being the face of said guide carriers containing
said notched portion, said notched portion following the curvature
of said face, and said concave face being the face opposite said
convex face, said upper and lower angled holes extending between
said convex and said concave faces.
10. The apparatus of claim 9, further including means for holding
said plurality of guide carriers in a fixed position on said rods;
and means for holding said rods in a fixed position in said
brackets.
Description
BACKGROUND OF THE INVENTION
This invention generally relates to devices for spacing articles on
a moving conveyor. Specifically, this invention relates to rotating
article-spacing helices. Most particularly, this invention relates
to an auxiliary device which holds articles in contact with an
article-spacing helix, while simultaneously preventing any reverse
or retrograde motion of the articles while engaged by the
helix.
The use of an article-spacing helix to provide a uniformly-spaced
single file of articles such as cans or bottles is well known in
the art. One problem with such a helix is that if the infeed is not
always filled, articles may jam in the helix and attempt to move
backward. When this occurs, the article usually falls and creates a
blockage of flow. In addition, the articles must be urged into
contact with the helix to ensure proper spacing. Numerous patents
in the prior art show devices for achieving this latter function.
Examples are seen in U.S. Pat. Nos. 1,959,123; 2,344,975;
2,542,090; 2,618,425; 2,645,399; and 2,890,787. However, it is
believed that none of the prior art devices will accomplish both of
the aforementioned functions as will the apparatus which is my
invention.
SUMMARY OF THE INVENTION
This invention is an apparatus for controllably, uniformly spacing
articles in a single file, which comprises an endless moving
conveyor for transporting a plurality of articles in a single file;
a rotating article-spacing helix located adjacent one side of the
endless conveyor, the helix forming a plurality of spaced,
article-engaging flights; and restraining means located adjacent
the conveyor in opposed relationship to the helix for holding the
articles in contact with the article-engaging flights and for
preventing retrograde motion of the articles.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top, plan view of one embodiment of the apparatus of
the present invention;
FIG. 2 is a top, plan view of the mounting block of the apparatus
of FIG. 1;
FIG. 3 is a perspective view of the apparatus of FIG. 1 with a
portion of the article-spacing helix removed;
FIG. 4 is a top, plan view of a second embodiment of the apparatus
of the present invention;
FIG. 5 is a perspective view, on an enlarged scale, of one of the
carriers of the apparatus shown in FIG. 4 with a part of the
guiding member removed; and
FIG. 6 is a perspective view of the apparatus of FIG. 4 with a
portion of the article-spacing helix removed.
DETAILED DESCRIPTION OF THE DRAWINGS
As seen in FIG. 1, a conventional article-spacing helix 10 is
located adjacent to a moving endless conveyor 12. The top view of
FIG. 1 shows only a portion of an entire system, omitting the drive
mechanism for the moving endless conveyor 12 and the
article-spacing helix 10. However, these mechanisms are
conventional and well-known, and may be seen in more detail in U.S.
Pat. No. 2,529,199. The conveyor 12 moves a plurality of articles
in a single file from right to left, as seen in FIG. 1. In this
specific example, the articles may be glass containers 14. The
purpose of the article-spacing helix 10 is to engage the glass
containers 14 and place them a precisely spaced distance apart for
further processing. At the time the glass containers 14 enter the
helix 10, the glass containers 14 may be in touching single-file
relationship. As may be seen in FIG. 1, the helix 10 spaces the
glass containers 14 in a precise and uniform single-file array. A
guide rail 16 helps to guide the containers 14 into the initial
portion of the helix 10. The guide rail 16 may be mounted on the
side frame, which is not seen in FIG. 1, of the conveyor 12. As the
containers 14 exit from the helix 10, a second guide rail 18 guides
the containers 14 away from the area of the helix 10. In
conventional operation of the article-spacing helix 10, the guide
rails 16 and 18 are actually connected through the entire length of
the helix 10 and serve to keep the glass containers 14 in contact
with the helix 10. As may be seen, the helix 10 forms a plurality
of article-engaging flights 20, which are separated by raised land
portions 21. As the helix 10 rotates, the container 14 is engaged
by the initial flight 20 and is progressively moved to the left, as
seen in FIG. 1, by the screw-type motion of the rotating helix 10.
In effect, the glass container 14 is transferred from one
article-engaging flight 20 to another, with the lands 21 serving to
space the glass containers 14, as previously noted. One of the
difficulties of the prior art, as previously pointed out, is the
difficulty in preventing containers 14 from tipping and falling
backward when they are held in contact with the article-engaging
flights 20 by a continuous guide rail.
As seen in FIG. 1, a mounting block 24 is attached to the side
frame of the conveyor 12 in opposed relationship to the helix 10.
As best seen in FIG. 2, one face of the mounting block 24 is made
up of a plurality of contacting mounting pads 26 set into the face
or, more properly, cut out of the face, in a sawtooth sort of
pattern. Each mounting pad 26 has an angled attachment face 28,
which terminates in a locating notch portion 30 positioned behind
the adjacent mounting pad 26. It should be noted that the locating
notches 30 are not a critical requirement of the mounting pads 26,
but are useful and are preferred for ease of assembly of the
complete device. In operation, the face 31 of the mounting block
24, opposite the face containing the mounting pads 26, is
positioned generally parallel to the path of travel of the glass
containers 14. The attachment faces 28 are angled toward the
direction of travel of the glass containers 14. It may be noted,
with respect to FIG. 1, that the glass containers 14 do not follow
a perfectly linear path in their travel through the area of the
helix 10, since the helix 10 is set at a slight angle with respect
to the conveyor 12; thus, the containers 14 actually proceed along
a somewhat arcuate path while being spaced by the helix 10.
However, the average path of travel of the containers 14 is
substantially linear along the conveyor 12, and the path of travel
is substantially parallel to the conveyor 12. In this situation, an
extension of any one of the angled attachment faces 28 would
intersect the average linear path of travel of the containers 14 at
an acute angle measured on the side of the intersection upstream of
the bottle flow. I have found that this angle may most
appropriately be set at approximately 30.degree..
Referring again to FIG. 1, the mounting block 24 is seen in
position on the opposite side of the conveyor 12 from the helix 10.
A plurality of flexible article-guiding members 32 are attached to
the mounting pads 26 of the mounting block 24. The article-guiding
members 32 are slipped into position in the locating notches 30 and
then secured to the angled attachment faces 28. The guiding members
32 may be attached to the attachment faces in any convenient manner
such as gluing, nailing or screwing. Since the guiding members 32
are fixed to the attachment faces 28, the guiding members 32 extend
outward into the flow of containers 14 at the same angle as the
attachment faces 28. The guiding members 32 are of sufficient
length to project into the path of travel of the containers 14 and
interfere with the path of travel of the containers 14. However,
being flexible, the guiding members 32 are bent forward in a
cantilevered mode as the containers 14 pass by them. This function
may clearly be seen in FIG. 1 with respect to the two containers 14
shown in position in FIG. 1. As the container 14 moves past a
particular guiding member 32, the guiding member 32 springs back
into its normal or unstressed position. This position is shown by
the center-three guide members 32 in FIG. 1. The resiliency of the
guiding members 32 holds the containers 14 in contact with the
article-engaging flights 20 of the helix 10, during the spacing
process for the containers 14. While the article-guiding members 32
are relatively flexible and readily bent in the direction of flow
of the containers 14, they present appreciable resistance to
bending in the opposite direction and to forces applied to their
height along the edge of the member 32. It is this resistance to
bending in the opposite direction which prevents containers 14 from
slipping backward and tipping over, as was possible in the guiding
devices of the prior art. It may be seen in FIG. 1, that the first
of the article-guiding members 32 adjacent to the entrance to the
helix 10 has snapped back into its original unstressed position and
is just touching the rearmost portion of the container 14 shown
entering the helix 10 in an "edge on" configuration. In this
position, if the container 14 were to be partially jammed on a land
portion 21, the container 14 would be restrained from rearward
motion by its contact with the article-guiding member 32, thus
preventing tipping of the container 14. This function results
because the article-guiding members 32 have substantial resistance
to bending from forces applied to their edges. Thus, FIG. 1 shows a
restraining means located adjacent the conveyor 12 in opposed
relationship to the helix 10 for holding the containers 14 in
contact with the article-engaging flights 20 and for preventing
rearward or retrograde motion of the container 14.
FIG. 3 illustrates the relative dimensions of the article-guiding
members 32. It may be seen that the article-guiding members 32 are
of a substantially rectangular configuration, having an appreciable
height with respect to the overall height of the container 14, and
being substantially less in thickness than in height or length. As
was previously pointed out, the length of the article-guiding
members 32 is sufficient to allow them to project into the path of
travel of the containers 14. The actual height of the guiding
members 32 may be adjusted to compensate for various heights of
containers 14 which are to be aligned by use of the helix 10.
However, it has been found that the overall height of the
article-guiding members 32, with respect to the container 14,
should be approximately 2/3 that of the overall height of the
container 14. A material which has proven to be quite satisfactory
for the guiding members 32 is a polyethylene about 0.060 inches
thick.
FIGS. 4, 5 and 6 show a somewhat different embodiment of the
present invention which allows adjustability of the length of the
helix 10 within which the restraining influence is exerted. That
is, the mounting block 24 illustrated in FIGS. 1, 2 and 3 is a
fixed device which provides a fixed length of guiding and
restraining within the helix 10. Under some conditions, it may not
be necessary to guide the container 14 through the entire length of
the helix 10, or it may be desirable to maintain the guiding
influence on the containers 14 some short distance after the exit
from the helix 10. Under these conditions, it should be clear that
it would be difficult to adjust the number of guiding members 32
carried by the mounting block 24, other than by removing some of
the guiding members 32. Since, as previously pointed out, the
guiding members 32 are fixed to the mounting pads 26, this is
obviously difficult to accomplish. Thus, I have devised a unit-type
of helix assisting apparatus utilizing the principles illustrated
in FIGS. 1, 2 and 3. Each of the article-guiding members 32 is
carried by an individual guide carrier 34. The guide carriers 34,
as best seen in FIG. 5, each have one convex face 35 and one
concave face 36. The convex faces 35 all have a notched portion 38
which follows the convex curvature of the face 35. The notched
portion 38 is provided to allow attachment of the article-guiding
members 32 to the guide carriers 34. In operation, the
article-guiding member 32 is attached to the guide carrier 34 in
the notched portion 38. This again may be done by screwing the
article-guiding member 32 into the convex face 35 of the guide
carrier 34. This results in the guiding members 32 themselves
having a slight curvature, as may be seen in FIG. 5. This curvature
further reinforces the resistance of the article-guiding members 32
to reverse or retrograde motion of the containers 14 during their
movement through the helix 10. The guide carriers 34 themselves are
not angled to present the article-guiding members 32 at an angle to
the flow of the containers 14, as was the case with the mounting
pads 26 on the mounting block 24. Rather, each of the guide
carriers 34 has an upper angled hole 40 and a lower angled hole 42
drilled completely through them. The holes 40 and 42 are parallel
to one another and set at substantially the same angle as was the
angled attachment face 28 of the mounting pads 26.
FIGS. 4 and 6 best show the assembly of a plurality of guide
carriers 34 into an article-guiding array such as that seen in
FIGS. 1 and 3. Two vertical support brackets 44 and 46 are attached
to the side frame of the conveyor 12 (not shown) on the opposite
side of the conveyor 12 from the helix 10, the bracket 44 being
opposite the helix exit and the bracket 46 being opposite the helix
entrance area. Each of the support brackets 44 and 46 has an upper
and a lower hole drilled completely through it to accept an upper
elongated threaded rod 48 and a lower elongated threaded rod 50. A
plurality of guide carriers 34, with article-guiding members 32
attached thereto, are slipped onto the upper rod 48 and the lower
rod 50, the rods 48 and 50 extending through the upper hole 40 and
the lower hole 42 in the guide carriers 34. The guide carriers 34
are assembled in such a fashion that the convex face 35 mates with
the concave face 36 of an adjacent guide carrier 34. In addition,
the guide carriers 34 are assembled in such a manner that the
article-guiding members 32 point in the direction of flow of the
glass containers 14. When the desired number of guide carriers 34
have been placed on the rods 48 and 50, a first end stop block 52
is secured in position with a nut 53. A second end stop block 54 is
positioned at the other end of the array of guide carriers 34 and
is secured in position with a nut 55. It may be appreciated that
tightening the nuts 53 and 55 will press the end stop blocks 52 and
54 toward one another and thus compress the guide carriers 34
between them and hold them tightly together, thereby serving as a
means for holding the guide carriers 34 in a fixed position. The
rods 48 and 50 are themselves secured from any further motion by
the use of locking nuts 58, which serve as means for holding the
rods 48 and 50 in a fixed position in the brackets 44 and 46. The
description previously given for the function of the apparatus of
FIGS. 1 and 3 equally applies to the embodiment shown in FIGS. 4
and 6. The curvature given to the article-guiding members 32 in the
embodiment shown in FIGS. 4 through 6 does impart a somewhat
greater degree of resistance to reverse motion, as previously
noted, but the function is substantially the same. It will be
observed that the angles of the holes 40 and 42 through the guide
carrier 34 present the article-guiding members 32 at an angle
toward the direction of flow of the containers 14, as was the case
in the embodiment shown in FIGS. 1 through 3.
* * * * *