BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a rolled base paper web feeder adapted to be equipped
in a corrugating machine, a rotary press or the like.
Description of the Prior Art
[0002] At first, description will be made on a rolled base paper web feeder in the prior
art with reference to drawings, in which Fig. 3 is a schematic view illustrating a
method for exchanging base paper webs according to an order change, and Fig. 4 is
a schematic view to be referred to for exchanging disadvantages of the base paper
web feeder in the prior art.
[0003] In Fig. 3, base paper webs (a liner, a core paper web) 1a and 1b for manufacturing
corrugated cardboard sheets are formed in a roll shape, and under an initial setting
condition, they are carried in and installed at predetermined positions within a manufacturing
line with the opposite ends of their central portions supported by rolling centers
3 of base paper web feeders Pa and Pb. Then, these base paper webs 1a and 1b to be
used for the manufacture are successively payed out by pinching rotation of feed rolls
16a and 16b to be conveyed to the next step of the process, and in order to prevent
occurrence of creases and slackening by braking excessive feed and applying a back
tension, at the rolling center portions 3 of the base paper web feeders Pa and Pb
are provided brakes not shown in the figure.
[0004] Now, upon exchange of base paper webs according to an order change, as shown in Fig.
3, a leading end of a new-order base paper web 1b held in a standby state is joined
to a traveling old-order base paper web 1a via a double-sided adhesive tape 17, and
also the old-order base paper web 1a is cut at the position Z shown in the figure
by means of a cutter 18 disposed contiguously to this joining point so that the next
new-order base paper web 1b can be fed continuously.
[0005] It is to be noted that at the leading end of the old-order base paper web 1a cut
at the time of joining paper web, a base paper web portion X-Y-Z as shown in the figure,
that is, a leading end portion of the paper web corresponding to the length from a
position X where the rolled base paper web 1a is payed out up to a cutting position
Z would be left under a pulled-out condition.
[0006] Accordingly, as a treatment for the remaining old-order base paper web 1a, a work
of winding up the above-mentioned payed-out portion of the rolled base paper web around
the side of the original roll followed by sticking it onto the roll by means of anti-slackening
tapes 19 as shown in Fig. 6 and 7 would become necessary. And in the prior art, for
the work of rewinding and accommodating the payed-out leading end portion of the rolled
base paper web, a method of manually rotating the roll or rotating the roll with the
aid of rotary drive means associated with the rear end of the rolling center 3 was
employed.
[0007] However, the above-mentioned paper web end rewinding apparatus in the prior art did
not have an automatic setting function for the paper web end position, and so, depending
upon a stop position of the paper web end after it was are wound around the roll,
there was a disadvantage that the paper web end may loosen and sag as illustrated
in Fig. 3, or it may stop at a location where a workability is bad, resulting in inconvenience
for the sticking work of the anti-slackening tapes 19. Therefore, in view of these
circumstances, upon positioning of the leading end of the paper web, delicate handworks
(rewinding around the roll) or fine movements in the case of a motor-drive type of
apparatus were necessitated. Accordingly, a long time was necessitated as a working
time period and the work was difficult, and hence a working efficiency could not be
improved, and this became a large problem jointly with frequent order changes.
[0008] As described in the preceding paragraph of the prior art, in the base paper web feeder
in the prior art, upon exchange of base paper webs, when a base paper web portion
remaining in a pulled-out state at the leading end of the base paper web after the
old-order base paper web was cut is rewound around the original roll to accommodate,
a method of rewinding the pulled-out base paper web portion either manually or by
means of a rotary driving device provided at the rolling center portion was employed.
[0009] However, in the above-mentioned method relying upon human labor, depending upon a
weight of a base paper web, the work is difficult. Also in the method relying upon
rotary drive means, the position of a cut end of a base paper web on the circumference
of the roll is indefinite, and hence for moving the roll up to a working position
for setting, correction by manual operation or correction by fine movement of a rotary
driving device is necessitated, in addition the work is not automated such that a
method of applying the adhesive tapes for fixing a leading end of a rolled base paper
web (for anti-slackening) also through a manual work is employed, and so, there still
remains a disadvantage such that it takes time for exchanging a base paper web and
resetting the machine.
SUMMARY OF THE INVENTION
[0010] It is therefore one object of the present invention to provide an improved base paper
web feeder, in which all the above-mentioned problems involved in the base paper web
feeder in the prior art can be resolved.
[0011] A more specific object of the present invention is to provide a base paper web feeder,
in which upon exchange of base paper webs, feeding of an old-order base paper web
is stopped with a leading and cut portion of the old-order base paper web placed at
a predetermined position on the circumference of the original old-order rolled base
paper web, and adhesive tapes for fixing can be sticked automatically.
[0012] According to one feature of the present invention, there is provided a base paper
web feeder, in which a rolling center for supporting a base paper web is provided
with a rotary drive means and a number of revolution detector means, also there is
provided a base paper web traveling velocity detector means, and data transmitted
from the respective detector means are fed back to the rotary drive means of said
rolling center via a controller, thereby a leading end portion of the paper web, which
is subjected to cutting for the purpose of exchange of the base paper web to be left
at the leading end of an old-order base paper web under a pulled-out condition, is
allowed to be wound on the side of a roll, and also the leading end cut portion of
the paper web is allowed to stop at a predetermined position on the circumference
of the rolled base paper web.
[0013] According to the present invention, a diameter D of an old-order base paper web is
calculated on the basis of a traveling velocity v of the base paper web at the time
of joining paper webs and a number of revolution per unit time N of the rolling center
of the old-order base paper web according to a formula D = v/π·N, then on the basis
of a relation between a payed-out length of the base paper web upon cutting the old-order
base paper web (that is, a length between a stop position of a leading end of the
base paper web on the circumference of the roll and a cut position: constant) L and
the diameter D of the above-mentioned old-order base paper web of L = π·D·N₀, is calculated
a number of revolution N₀ of the rolling center of the old-order base paper web for
producing the payed-out length L of the above-mentioned base paper web according to
a formula N₀ = L/π·D, the above-mentioned number of revolution N₀ is fed back to a
rotary driving device of the rolling center (rolled old-order base paper web), the
roll of the base paper web is inversely rotated by this number of revolution N₀, and
thereby the leading end portion of the old-order base paper web cut for the purpose
of exchange of base paper webs is rewound on the roll. According to the present invention,
owing to the above-mentioned control, it becomes possible that after the cut portion
of the leading end of the old-order base paper web has been set (stopped) at a predetermined
position on the circumference of the rolled base paper web, adhesion tapes for anti-slackening
are automatically stuck, and therefore, exchange of base paper webs necessitates only
the works of unloading an old-order base paper web and loading a new-order base paper
web.
[0014] The above-mentioned and other objects, features and advantages of the present invention
will become more apparent by reference to the following description of one preferred
embodiment of the invention taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In the accompanying drawings:
Fig. 1 is a general plan view of construction of a base paper web feeder according
to the present invention;
Fig. 2 is a side view of the arrangement shown in Fig. 1;
Fig. 3 is a schematic view for explaining a method of exchanging base paper webs according
to an order change;
Fig. 4 is a schematic view for illustrating disadvantages of a base paper web feeder
in the prior art;
Fig. 5 is a schematic view to be referred to for explaining the operation of the base
paper web feeder according to the present invention;
Fig. 6 is a side view for explaining a method for accommodating an old-order base
paper web after exchange; and
Fig. 7 is a front view for explaining a method for accommodating an old-order base
paper web after exchange.
BEST MODE FOR CARRYING OUT THE INVENTION
[0016] In the following explanation of the present invention with respect to an embodiment
with reference to the drawings, Fig. 1 is a general view of construction for explaining
a base paper web feeder according to the present invention. In the present invention,
upon exchange of base paper webs accompanied by an order change and the like, such
control is provided that a remaining leading end portion rewound (payed-out) from
an old-order base paper web is wound on the side of the original roll, and a leading
end cut portion is allowed to stop at a predetermined position on the circumference
of the roll, so as to automate following treatments such as prevention of slackening
and the like, that is application of tapes for fixing, the construction and function
of which will be explained hereinafter.
[0017] As shown as one example in Fig. 1, the present invention is provided with brakes
4 at rear ends of a pair of rolling centers 3a and 3b supported by movable stands
2 with a shaft at the base paper web feeder portion in order to support a known rolled
paper web 1. The brake 4 is constituted by a rotational element 4b secured to the
shaft of the rolling centers 3a and 3b via a key 5 and a rotational element 4a, in
which a gear 6 secured to one end side of the rotational element 4a is engaged with
a gear 8 secured to an axial end of a motor 7 mounted to the same stand 2. In addition,
to an axial rear end of the rolling center 3a at one side is mounted an encoder 10
via a coupling 9.
[0018] On the other hand, to one side end of a shaft of a feed roll 16a supported by a frame
11 with a shaft for conveying a base paper web 1 is mounted an encoder 14 via a coupling
13 in the same manner as the rolling center 3. Incidentally, in the figure, 15 is
a controller in which after input of data transmitted from the encoders 10 and 14
to calculate, the feed back to a motor 7 is performed, thereby a number of revolution
(angle) of the rolling center 3 (rolled paper web 1) can be set.
[0019] In Fig. 2, the traveling velocity v of the rolled paper web 1 is v = π·d·n from the
diameter d of the feed roll 16a and the number of revolution per unit time n, and
this value is equal to v = π·D·n obtained from the diameter D of the rolled base paper
web 1 and the number of revolution per unit time N. Therefore, on the basis of a relation
of v = π·d·n = π·D·N, the diameter D of the rolled paper web 1 upon joining the paper
web can be calculated with D = π·d·n/π·N (d is a constant value, and n and N can be
detected by the encoders 10 and 14).
[0020] On the other hand, the rolled paper web length L payed-out at the leading end of
the rolled paper web upon joining the paper web, that is a length between the standard
point X on the circumference of the rolled paper web, the point Y for turning around
the guide roll 12 and the cutting point Z of the base paper web in Fig. 2 is approximately
a constant value. Therefore, with respect to the relation of the diameter D of the
rolled paper web 1 after cutting the old-order base paper web and the above-mentioned
payed-out length L, the number of revolution N₀ of the rolling center of the base
paper web necessary for the same length L to be payed-out can be calculated with L
= πDN₀ that is N₀ = L/πD, and when the rolling center of the base paper web is inversely
rotated by the number of revolution of N₀ (angle) to allow the leading end of the
paper web to be wound, the cutting point at the leading end of the rolled paper web
can be coincided with the standard point X on the circumference of the rolled paper
web.
[0021] Incidentally, the working place shown in Fig. 5 (the position Y for sticking the
anti-slackening tapes) can be optionally set by correction with respect to the standard
point X, and also excessive rotation or the like of the rolled paper web accompanied
by the inertia after cutting can be easily corrected by counting the number of revolution
with the encoder 10 to be inversely rotated.
[0022] The present invention is constructed to provide the function as described above,
wherein the position Z of the cutting point (the utmost leading end portion) of the
old-order base paper web cut for the purpose of exchange of base paper webs is subjected
to winding to the side of the original roll to make it possible to be positioned at
the specified place on the circumference.
[0023] In addition, 20 in Fig. 2 is a tape sticking device constructed as a pair to be capable
of contact and separation with respect to the outer peripheral surface of the rolled
paper web or as plural sets provided to align in an axial direction of the roll of
the rolled paper web, with which after the rolled paper web is wound to the side of
the roll to allow the leading end to stop at a predetermined position, for example,
at X, the anti-slackening tapes 19 can be automatically stuck at the specified positions
shown in Fig. 5 (three positions in the figure). Incidentally, as the above mentioned
automatic tape sticking device there are various known types.
[0024] As explained above, according to the present embodiment, the treatment of the leading
end of the old-order base paper web is automated, so that the exchange of base paper
webs necessitates replacement of new-order and old-order base paper webs only. Incidentally,
the present invention is not limited to the above-mentioned embodiment only, which
can be added with various modifications within a scope without departing from the
scope of the present invention.
EFFECT OF THE INVENTION
[0025] According to the present invention, the diameter of the base paper web at the time
point of joining the paper webs is calculated on the basis of the paying-out velocity
(traveling velocity) of the rolled paper web and the number of revolution of the rolled
base paper web, the number of revolution required for rewinding the rolled base paper
web is calculated on the basis of the paying-out length of the rolled paper web up
to the cutting position and the above-mentioned diameter of the base paper web, and
the rolled base paper web is moved to the side (direction) of winding by the obtained
predetermined number of revolution, thereby the cutting portion at the leading end
of the paper web is controlled to stop at the predetermined position on the outer
circumference of the rolled base paper web, so that the work of combination such as
sticking of tapes or the like to be performed upon accommodation of the leading end
of the rolled paper web can be carried out automatically with the provided tape sticking
device, and the work of exchange of base paper webs necessitates the replacement and
exchange of new-order and old-order base paper webs only. Therefore, labor saving,
increase in safety and reduction in working time can be contemplated.