Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02518186 2005-09-06
QUARTER FOLDER APPARATUS
FIELD OF THE INVENTION
The present invention relates to a folding apparatus and more particularly,
relates to
a quarter folder for signatures.
BACKGROUND OF THE INVENTION
The folding of paper signatures or like objects is known in the art.
Generally, such
folders operate at a relatively slow throughput compared to the speed of the
press from
which the signatures come. In view of this limitation, either the press speed
is slowed
down to meet that of the folding apparatus or alternatively, a plurality of
the folder
machines for a single press is required.
Presses conventionally include folding units which bring out multiple sheet
single
folded assemblies in an overlapped running shingle. The assemblies are called
signatures
and their folded edges are called spines. The signatures in a running shingle
usually move
with the spines as the leading edge and with each signature set back slightly
from the one
which precedes it so that it travels in a shingled relationship. The single
folded signature is
often called a half folded signature and it often is desirable to fold the
same to become a
quarter folded signature. By cutting the original spine edge, a quarter folded
signature may
be turned into a booklet where each page is one-quarter of the original sheet
of paper.
Generally, the quarter folding is done on an individual signature. This
operation
presents an inherent limitation on the speed at which it can be done since
each sheet must
be individually handled and then quarter-folded.
CA 02518186 2005-09-06
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a folder for signatures
which can
operate at a high through-put.
It is a further object of the present invention to provide a mobile inline
quarter
folder which is able to keep up with the printing speed of a relatively fast
web press.
According to one aspect of the present invention, there is provided a folder
comprising an input conveyor for receiving a shingled stream of signatures,
means for
aligning the shingled stream of signatures, means for folding the shingled
stream of
signatures to form a folded stream of shingled signatures, means for
singulating the folded
stream of shingled signatures into individual folded signatures, means for re-
shingling the
individual folded shingled signatures into a stream.
According to a further aspect of the present invention, there is provided a
method
for folding signatures, the method comprising the steps of providing a line of
shingled
signatures, aligning the shingled signatures, folding the shingled signatures,
singulating the
folded shingled signatures and re-shingling the singulated signatures to form
shingled
folded signatures.
The apparatus of the present invention includes a number of different stations
which
operate together to provide an inline folder which can operate at high speeds.
As utilized
herein, the word signatures is used to designate any paper which is to be
folded. In a
preferred embodiment, the apparatus of the present invention is used as a
quarter folder -
i.e. it takes an already folded signature and further folds the same. However,
it will be
understood that the present invention can also be used for performing a half
folded
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signature. The description of the preferred embodiment will generally relate
to the quarter
folder configuration.
The first station preferably includes a crusher roller which is designed to
reinforce
the original half fold on the signature as well as to eliminate any air
pockets to ensure
proper handling of the signature throughout the apparatus. The crusher roller
is preferably
provided with a quick release for security purposes.
The first station in a preferred embodiment also comes with a drop down air-
actuated conveyor which works when a make-ready switch is turned off. In the
off
position, copies entering the machine are immediately diverted downwards under
the
machine where they may be placed into a scrap bin or alternatively, fall onto
a separate
conveyor which carries the product away from the machine. When the pressman is
ready
to commence the quarter folding operation, the make-ready switch is turned on
and copies
are immediately allowed to proceed to the subsequent stations. Incorporated
with the drop
down conveyor are sensors to detect signatures which are sufficiently out of
line so as to
pose a problem for further processing. When such signatures are detected, the
conveyor
will immediately drop down.
The second station comprises an aligning station wherein there is provided a
high-
speed belt_jogger which will accurately position the copies entering therein.
The jogger
includes a slightly elastic belt which is entrained about rollers. At least
some of the rollers
are of a non-circular configuration so as to provide a vibratory action to the
stream of
shingled signatures.
In preferred embodiments, a tensioning arrangement is provided for the belting
forming the jogger to ensure that the belt as it passes over the non-circular
roller is not
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slipping and provides constant vibration. Furthermore, the rollers for the
belt preferably
are provided with a double crown arrangement to prevent the belts from
derailing.
A third station comprises a section for pinning the signatures and forming the
pre-
folding configuration. Wings of the paper entering the third section are
guided to prevent
subsequent problems with the handling of the signatures. In this section, the
signatures are
formed and folded into the desired configuration and each copy is scored to
ensure a clean
final fold.
The fourth station is operative to finish the fold which forms the new spine
of the
signatures. In this regard, spring steel is used immediately after the
creasing wheel to
ensure a satisfactory fold. The bottom section of the folder is open so that
the signature
can now move without any friction on the sides which would otherwise create an
uneven
quarter folded copy.
In the fifth station, the copies are turned through 90° so that they
are in a desirable
horizontal position for the subsequent operations. The arrangement is such
that the
subsequent high-speed section does not prematurely pull the copies out ahead
of time.
The sixth station is a singulating station which individually separates a
stream of
signatures in preparation for the re-shingling operation.
The seventh station is a re-shingling operation and provides a catching and
braking
system which re-shingles each copy to be the same distance apart as when the
signatures
first entered the apparatus. Preferably, the section also has a drop down
conveyor of the
type discussed with respect to the first station.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the invention, reference will be made to the
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accompanying drawings illustrating embodiments thereof, in which:
Figure 1 is a top plan view illustrating the sequence of operation for the
transformation of a half fold signature into a quarter fold signature;
Figure 2 is a side elevational view thereof;
Figure 3 is a top plan view of the apparatus;
Figures 3A and 3B are top plan views of the front and rear portions of Figure
3;
Figures 4A and 4B are side elevational views thereof;
Figure 5 is a top plan view of one of the belts in a jogger section of the
apparatus;
Figure 6 is a view taken along the lines 6-6 of Figure 5;
Figure 7 is a top plan view of the former section of the apparatus;
Figure 8 is a sectional view taken along the lines 8-8 of the Figure 7;
Figure 9 is a cross sectional view taken along the lines 9-9 of Figure 7;
Figure 10 is an expanded top plan view of the turning of the quarter folded
signatures through 90 degrees; and
Figure 11 is a side elevational view thereof.
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings in greater detail and by reference characters
thereto, there
is illustrated in Figure 3A the first portion of a quarter folder apparatus
which is generally
designated by reference numeral 10.
Quarter folder apparatus 10 is designed to receive a plurality of half fold
signatures
12 coming from any suitable source of the same, including a printing press.
Half fold
signatures 12 are delivered to a conveyor section generally designated by
reference
numeral 14 and which conveyor section 14 includes a first roll 16, a second
roll 18, and a
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third roll 20. A plurality of drive belts 22 are entrained about first rolls
16 and 18, with
other drive belts 24 being entrained about second roll 18 and third roll 20.
Mounted above
first roll 16 is a crusher roll 26 which is designed to reinforce the crease
forming the spine
of half fold signatures 12. As may be seen in Figure 4A, a pneumatic cylinder
28 is
mounted to a frame post 32 and to a bracket 30 on which third roll 20 is
journalled. Thus,
the conveyor can be moved from a normal operational position to a drop down
position (as
shown in dotted lines) wherein any signatures there are discharged into a
container 34
situated therebelow.
The subsequent section of apparatus 10 is a jogger section and to which
reference
will now be had. The jogger includes a plurality of rolls 46 about which belts
48 are
entrained. The aligning of the signatures is accomplished by having a pair of
end rolls 38
about which a jogger belt 44 is entrained. As will be seen in Figures 5 and 6,
there is also
provided a plurality of hexagonal rolls 40 to impart a vibratory action to
jogger belt 44.
There are also a plurality of pressure rolls 42 which are designed to maintain
pressure on
jogger belt 44 such that a good vibratory action is achieved without any
slippage of the
belt 44. The jogger belts converge in a downstream direction.
Subsequently, the half folded signatures pass to a forming and folding
section. In
this section, there are provided a pair of lower end rolls 52, 54 about which
a small
diameter belt 58 is entrained. Between lower end rolls 52, 54 there are also
provided a
plurality of support rolls 56.
There is also provided a pair of top end rolls 60 and 62 along with a
plurality of top
support rolls 64 which are pressure adjustable. A relatively narrow top belt
66 is entrained
about the rolls.
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At the entrance to the forming and folding section, there are provided a pair
of guide
bars 68 and 70 (Figure 9), one being situated on each side of the apparatus.
Each of the
guide bars is designed to gently guide the ends of the half folded signatures
with the
guiding surface being convex in configuration as may be seen in Figure 9.
Situated further downstream are a second pair of guiding members 72, 73. A
pair of
spring steel members 74, 76 are arranged to finalize the fold in the
signatures.
Immediately preceding spring steel members 74, 76 is a creasing roll 78
designed to impart
a sharp crease in the signatures. At the next section, there are provided a
pair of belt
mounting assemblies 80, 80'. A belt 88 is entrained a roll in belt mounting
assembly 80
thereabout as well as a roll 82 at the other end thereof. Mounted intermediate
the rolls is a
guide roller 84. As may be seen in Figure 3, a pneumatic cylinder 86 is
provided for
moving belt mounting assembly 80 is provided.
As shown be seen in Figure 3, belts 88, 88' are twisted such that they take
the
signatures from a vertical direction to 90° to a horizontal direction.
During all this time,
the belts maintain a secure grip on the spine of the signatures.
Following the folding operation, the signatures are fed to a singulating
mechanism
which comprises an upper conveyor 92 and a lower conveyor 102. Upper conveyor
92
comprises a pair of end rolls 94 about which belts 100 are entrained. Mounted
centrally
between end rolls 94, 96 is a pressure roll 98.
Lower conveyor 102 includes end rolls 104, 106 about which belts 108 are
entrained.
The above arrangement is such that as signatures are fed, a nip is created
between
belts 100, 108 by means of pressure roll 98. This section is running at a
substantially
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higher speed than the previous section and a single signature is withdrawn
from the
shingled stream. In this regard, the spacing is such that the next signature
is securely
retained by the preceding section.
The re-shingling section comprises an upper conveyor 110 which includes a pair
of
end rolls 112, 114 and adjustable pressure rolls 116, 118 with belts 126
entrained
thereabout. A lower conveyor 120 comprises a pair of end rolls 122, 124 having
belts 128
entrained thereabout. As may be seen from Figure 4B, there is also provided a
pneumatic
cylinder 130 mounted on bracket 132 of the frame and a bracket 134 of lower
conveyor
120. Thus, the conveyor can be dropped down or lowered to deposit undesired
product in
container 136.
As the signatures are travelling at an extremely high rate of speed as they
exit the
singulating section, the geometry of the upper conveyor 110 and lower conveyor
120 is
important. As may be seen, lower conveyor 120 has a slight upward angle while
there is a
convergence between belts 122, 124 to guide the singulated shingles.
Preferably, the lower
conveyor is at an angle of between 4° and 6° with respect to the
horizontal.
Referring to Figures 1 and 2, the operation of the machine on the signatures
is
illustrated. As designated by reference numeral 12, originally the signatures
enter as half
fold signatures and typically slightly misaligned. The signatures then go
through the
crusher roll and the jogger section as illustrated in reference numeral 202
where they are
aligned and flattened. As shown by reference numeral 204, as they exit the
aligned or
jogging section, they are in a proper shingled position. Subsequently, as
indicated by
reference numeral 206, the signatures have their wings guided downwardly
until, as they
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pass through the end of the forming section, they are as shown by reference
numeral 208
with a final folding being indicated by arrows 210.
As indicated by reference numeral 2I2, the shingles are then rotated through
90° to
lie flat as indicated by reference numeral Z I4 where they pass to be
singulated as indicated
by reference numeral 216.
It will be understood that the above described embodiment is for purposes of
illustration only and that changes and modifications may be made thereto
without departing
from the spirit and scope of the invention.
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