IES85026Y1 - Apparatus for stacking articles - Google Patents
Apparatus for stacking articlesInfo
- Publication number
- IES85026Y1 IES85026Y1 IE2007/0455A IE20070455A IES85026Y1 IE S85026 Y1 IES85026 Y1 IE S85026Y1 IE 2007/0455 A IE2007/0455 A IE 2007/0455A IE 20070455 A IE20070455 A IE 20070455A IE S85026 Y1 IES85026 Y1 IE S85026Y1
- Authority
- IE
- Ireland
- Prior art keywords
- conveyor
- articles
- loading station
- catch
- article
- Prior art date
Links
- 230000000284 resting Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000001360 synchronised Effects 0.000 description 1
Abstract
ABSTRACT An apparatus for stacking articles comprises a loading station 12 for receiving successive articles to be stacked. A conveyor 14 removes the articles successively from the loading station, the removed articles being substantially equally spaced along the conveyor and the conveyor being driven to move intermittently by in each case a distance substantially equal to the inter-article spacing. A device 16 simultaneous picks a plurality of adjacent articles from the conveyor and transfers them to a like plurality of piles 36.
Description
This invention relates to an apparatus for stacking
gpparatus for Stacking/Articles
articles.
According to the present invention there is provided an
apparatus for stacking articles, comprising loading means
for feeding articles successively to a loading station, a
conveyor for removing the articles successively from the
loading station, the removed articles being substantially
equally spaced along the conveyor and the conveyor being
driven to move intermittently by in each case a distance
substantially equal to the inter—article spacing, and a
device for simultaneously picking a plurality of adjacent
articles from the conveyor and transferring them to a
like plurality of piles.
Embodiments of the invention will now be described, by
way of example, with reference to the accompanying
drawings, in which:
Figure 1 is a side View of an apparatus according to the
embodiment.
Figure 2 is a plan View of the apparatus of Figure 1
omitting the transfer mechanism.
Figure 3 is an enlarged side View of the indexing
conveyor forming part of the apparatus of Figure 1.
Figures 4 illustrates the operation of the transfer
mechanism.
The embodiment shows an apparatus for stacking elongated,
open—ended steel sections 10 having a generally trough-
shaped cross-section. The apparatus comprises four main
components: a loading station 12, an indexing Conveyor
14, a transfer device 16 and an offload conveyor 18. A
control unit 11 controls and synchronises the operation
of these components.
At the loading station 12 the inverted sections 10 are
fed by an accelerator conveyor belt 24, Figure 2,
successively onto a stationary table 20 located over one
end of the indexing conveyor 14 (the table is not shown
in Figure 2). Each section 10 is slid onto the table 20
by movement along its own longitudinal axis normal to the
direction of movement of the indexing conveyor 14. The
direction of sliding each section 10 onto the table 20 is
indicated by the arrow A in Figure 2 and the direction of
movement of the conveyor 14 by the arrows B.
The table 20 has a stop plate 22 whose position relative
to the width of the conveyor 14 is adjustable between 22’
for short steel sections 10’ and 22" for long steel
sections 10" and to any point in between for
intermediate length sections (despite both short and long
sections 10’, 10" being shown together on Figure 2 for
purposes of explanation, only one length of steel section
will be handled at a time). If desired the stop plate 22
could be adjusted further to the right, as seen in
Figure 2, for even longer section lengths. When the
leading end 100 of a section 10 meets the stop plate 22
that section is properly positioned on the table for
transfer by the indexing conveyor 14.
The conveyor 14 comprises three laterally spaced endless
chains 26 which are aligned with one another and
synchronised for intermittent movement in a manner to be
described. When a steel section 10 is properly
positioned on the table 20 it will span either two chains
(section 10’) or three chains (section 10"), according
to its length. Each chain 26 has a set of outwardly
extending catches, in the form of pegs 28, which are
arranged at equal intervals along the chain. Each peg 28
on a chain 26 is laterally aligned with a respective peg
on each of the other chains so that the pegs are aligned
in triplets across the width of the conveyor.
When the leading end of a steel section 10 meets the stop
plate 22 a proximity sensor (not shown) sends a signal to
the control unit 11 which initiates an indexing movement
of the conveyor 14. This movement consists of a single
movement of the conveyor chains 26, in the direction of
the arrow C in Figure 3, by a distance equal to the
distance between adjacent pegs 28, after which the
conveyor stops. During such movement one of the pegs 28
on each chain spanned by the section 10 currently on the
table 20 rotates up into contact with the inside front
edge of the section 10 (the table being suitably slotted
to allow such rotation), entrains that section, and
removes it from the table 20 onto fixed rails 30 which
extend along and just above the chains 26. The indexing
movement therefore moves the section 10 from position 1
in Figure 3, i.e. on the table 20, to position 2 which is
at a pre—determined position along the conveyor 14 from
the table 20. Subsequent indexing movements, each
initiated by a respective steel section 10 engaging the
stop plate 22, slides each section 10 currently on the
rails 30 one inter—peg distance further away from the
table 20 while simultaneously moving the section 10 on
the table at position 1 into the second position 2.
A counter in the control unit 11 is incremented each time
the conveyor 14 makes an indexing movement. Each time
four such movements have been counted (five when the
machine is initially started up), i.e. when all four
positions 3-6 of the conveyor are occupied by a
respective section 10, the control unit 11 activates the
transfer device 30.
The transfer device 16 comprises a horizontally movable
carriage 32 having four vertically movable
electromagnetic heads 34. As seen in Figure 4, when the
device 16 is activated the heads 34, initially held in a
raised position over the respective conveyor positions
3-6, are lowered onto the sections 10 in those positions
and then actuated to magnetically grip the sections 10.
The heads 34 are now lifted and the carriage 32 moves
horizontally until the four sections 10 held by the heads
are over respective ones of four stacked piles 36 of
sections (Figure 1) on the offload conveyor 18. Now the
heads 34 are lowered so that the sections 10 held by the
heads are lowered into the respective piles 36, whereupon
the heads 34 are de—energised to release the sections.
The heads are now raised and the carriage 32 returns to
its initial position over the conveyor 14. Clearly,
loading of sections 10 onto the table 20 and indexing of
the conveyor 14 is halted at least while the heads 34 are
removing the sections 10 from the conveyor 14.
When four stacks of fifty sections 10 (a batch) have
accumulated on the offload conveyor 18, the control unit
activates the conveyor 18 to provide space for
receiving the next batch. Once two batches have
accumulated on the conveyor with a third being
accumulated, the control unit activates a signal or an
alarm to indicate that the batches need to be strapped
and off—loaded
a forklift operator need only attend the stacking station
— usually by a forklift. This means that
every hour or so to unload two or three batches of
profiles.
The advantage of the embodiment is that pegs 28 ensure
reliable spacing and alignment of the steel sections 10
when picked up by the transfer device 16, so ensuring the
sections will be reliably stacked. If a conventional
conveyor belt were used, this spacing would not be
guaranteed.
The invention is not limited to the embodiments described
herein which may be modified or varied without departing
from the scope of the invention.
Claims (5)
1. An apparatus for stacking articles, comprising loading means for feeding articles successively to a loading station, a conveyor for removing the articles successively from the loading station, the removed articles being substantially equally spaced along the conveyor and the conveyor being driven to move intermittently by in each case a distance substantially equal to the inter—article spacing, and a device for simultaneously picking a plurality of adjacent articles from the conveyor and transferring them to a like plurality of piles.
2. An apparatus as claimed in claim 1, wherein the conveyor is an endless conveyor having a set of catches arranged at substantially equal intervals along its length, each catch for entraining a respective article at, and removing the article from, the loading station during movement of the conveyor.
3. An apparatus as claimed in claim 2, wherein the loading station comprises a support with a gap to allow each catch to rotate up into contact with an article resting on the support during movement of the conveyor.
4. An apparatus as claimed in claim 1, 2 or 3, wherein the articles are elongated and fed along their own axes to the loading station in a direction substantially normal to the direction of movement of the conveyor.
5. An apparatus as claimed in claim 4, wherein the conveyor comprises at least two laterally spaced sets of catches, each catch in one set being aligned with a respective catch in the other set.
Publications (2)
Publication Number | Publication Date |
---|---|
IES85026Y1 true IES85026Y1 (en) | 2008-10-29 |
IE20070455U1 IE20070455U1 (en) | 2008-10-29 |
Family
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