Cutting – Processes
Reexamination Certificate
1999-10-29
2003-05-27
Shoap, Allan N. (Department: 3724)
Cutting
Processes
C083S408000, C083S499000, C083S508300
Reexamination Certificate
active
06568304
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an order changing method in a corrugating machine for manufacturing a corrugated fiberboard sheet. More particularly, the present invention relates to an order changing method in a corrugating machine having the paper patch and sheet taking arrangement of a corrugated fiberboard web in such a manner that dividing slits of the corrugated fiberboard web are set on an almost straight line before and after an order change.
2. Description of the Related Art
FIG. 5
is a conceptual view showing a part of the downstream side of a corrugating machine for manufacturing a corrugated fiberboard sheet. In
FIG. 5
, a slitter scorer state
101
is provided on the right side and a cut-off stage
102
is provided on the left side. Cutting and creasing are performed while a corrugated fiberboard web
103
is running from the slitter scorer stage
101
toward the cut-off stage.
The slitter scorer stage
101
comprises one cutter
104
and two slitter scorer devices
105
a
and
105
b
. One of the slitter scorer devices
105
a
and
105
b
is usually operated, and the other is kept with the setting switched to cutting conditions corresponding to the next order.
Trim ducts
150
a
and
150
b
for sucking a trim of the corrugated fiberboard web
103
are provided behind the slitter scorer devices
105
a
and
105
b
, respectively.
The cut-off stage
102
positioned on the downstream side of the slitter scorer step
101
comprises upper- and lower-stage cut-off devices
106
and
107
for cutting the corrugated fiberboard web
103
in a transverse direction orthogonal to a running direction thereof (hereinafter referred to as a flow direction or a progress direction).
According to such a corrugating machine
110
, the corrugated fiberboard web
103
stuck by means of a double facer (not shown) which is provided on the upstream side is in the progress direction of the corrugated fiberboard web
103
at the slitter scorer stage
101
, and is then cut to have the same length in the transverse direction at the cut-off stage
102
. Consequently, a plurality of rectangular corrugated fiberboard sheets
111
and
112
shown in
FIG. 6
can be manufactured. The corrugated fiberboard sheets
111
and
112
are stacked by means of a stacker.
Next, description will be given to a sheet taking operation to be performed by the corrugating machine
110
. The above-mentioned cut-off operation means a so-called double cut-off operation to be performed by the two cut-off devices
106
and
107
.
FIG. 6
is a plan view showing the sheet taking operation for processing the corrugated fiberboard web
103
by the double cut-off operation.
The corrugated fiberboard web
103
is cut into a plurality of portions along slitter cutting lines
120
in the flow direction of the corrugated fiberboard web
103
at the slitter scorer step
101
. By using, as a boundary, a dividing slit M which is one of the slitter cutting lines
120
, for example, an upper web
103
a
positioned on the upper side in
FIG. 6 and a
lower web
103
b
are fed to the upper-stage cut-off device
106
and the lower-stage cut-off device
107
respectively, and are cut by cut-off lines
121
and
122
in the transverse direction of the corrugated fiberboard web
103
and are cut away at equal intervals in the flow direction respectively. Thus, the rectangular corrugated fiberboard sheets
111
and
112
having different dimensions can be manufactured in the upper-stage cut-off device
106
and the lower-stage cut-off device
107
, respectively.
For example, when the corrugated fiberboard sheets
111
and
112
having different sizes are being processed by the upper-stage cut-off device
106
and the lower-stage cut-off device
107
, a dimension of the sheet to be cut by the cut-off devices
106
and
107
is changed in some cases. This change is referred to as an order change. The order change is performed in the following two cases.
(1) Only one of the upper- and lower-stage cut-off devices
106
and
107
is subjected to the order change.
For example, the corrugated fiberboard sheets
111
and
112
are manufactured in independent production lots by the upper- and lower-stage cut-off devices
106
and
107
, respectively. Therefore, even if a predetermined number of corrugated fiberboard sheets have been manufactured in one of the upper and lower stages, the production is rarely finished at the same time in the other stage. Accordingly, if the production is completed in one of the upper and lower stages (for example, the upper stage side
106
), it is necessary to newly change the order. In addition, if the kind of paper does not need to be changed but only the width of the paper is to be changed, the production should be continued with the same order in another stage (for example, the lower stage side
107
).
(2) Before and after the order change, both the upper- and lower-stage cut-off devices
106
and
107
are subjected to the order change. At this time, it does not matter if the kind of paper is changed.
Various order changing methods to be used in the corrugating machine
110
have conventionally been proposed. As one of examples, a method described in Japanese Unexamined Patent Publication No. Hei 6-210772 will be described below with reference to FIG.
7
.
FIG. 5
described above illustrates equipment based on the method.
FIG. 7
shows a case in which the upper-stage cut-off device
106
maintains the same order and the lower-stage cut-off device
107
performs an order change to manufacture a product having a smaller width. Accordingly, a web width is reduced according to the width of the product before and after the order change.
First of all, a corrugated fiberboard web
103
x
having an old order is processed by the slitter scorer device
105
a
shown in FIG.
5
. In the slitter scorer device
105
a
, the corrugated fiberboard web
103
x
is cut by a slitter cutting line
120
x
and a dividing slit Mx shown in FIG.
7
. Therefore, both ends
160
x
and
160
x
of the corrugated fiberboard web
103
x
in a transverse direction act as trims. The trims
160
x
and
160
x
are sucked into the above-mentioned trim duct
150
a
(
150
b
) and are removed.
Next, upper and lower shafts of the slitter scorer device
105
a
are opened in a proper position on this side of a paper patch portion, thereby stopping the cutting. In advance, a trim cutting line
130
should be formed on the ends of the corrugated fiberboard webs
103
x
and
103
y
by a rotary shear (not shown).
The reason why the trim cutting line
130
should be formed will be described below. In a case where the trim cutting line
130
is not formed on the trim
160
x
of the corrugated fiberboard web
103
x
having an old order, there is a possibility that the corrugated fiberboard web
103
x
might be pulled by the trim
160
x
and hit against the trim duct
150
a
, thereby causing jam-up or the like.
Furthermore, if the trim cutting line
130
is not formed on trims
160
y
and
160
y
of the corrugated fiberboard web
103
y
having a new order, the trims
160
y
and
160
y
are kept coupled to the corrugated fiberboard web
103
y
so that the corrugated fiberboard web
103
y
is not sucked into the trim duct
150
a
. Alternatively, if the corrugated fiberboard web
103
y
is forcedly sucked into the trim duct
150
a
with the trims
160
y
and
160
y
kept coupled to the corrugated fiberboard web
103
y
, there is a possibility that an inconvenience might be caused, that is, the trim duct
150
a
becomes clogged.
In order to denote parts before and after the order change by designations, particularly, an old order before the order change is indicated as x, and a new order after the order change is indicated as y.
Next, a paper patch portion is interposed to form a proper space, thereby operating the slitter scorer device
105
b
. Thus, the cutting of the corrugated fiberboard web
103
y
having a new order is started. In an order changing area
131
, slitter cutting lines
120
x
and
120
y
h
Ito Masaharu
Kato Toshihide
Miyake Takayuki
Choi Stephen
Mitsubishi Heavy Industries Ltd.
Myers Bigel & Sibley & Sajovec
Shoap Allan N.
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