Sheet feeding or delivering – Feeding – With means to align sheet
Reexamination Certificate
1999-05-27
2001-06-12
Bollinger, David H. (Department: 3651)
Sheet feeding or delivering
Feeding
With means to align sheet
C271S245000, C271S253000
Reexamination Certificate
active
06244592
ABSTRACT:
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
1. Field of the Invention
The present invention relates to a sheet feeding apparatus for a corrugated fiberboard container making machine for feeding stacked corrugated fiberboard sheets one after another.
2. Description of Related Art
FIGS. 8 and 9
are explanatory views showing outlines of conventional sheet feeding apparatuses for a corrugated fiberboard container. In
FIG. 8
, frames
1
are erected on both sides, right and left, of a table
2
, and a beam
3
is installed between the frames
1
. A hopper
6
is defined by front stops
4
attached to the beam
3
and side guides
5
, and corrugated fiberboard sheets
7
are stacked on the table in this hopper
6
. A lowermost sheet
7
a
of the stacked corrugated fiberboard sheets
7
is kicked from one end side by a kicker
8
and reaches feed rolls
9
on the other end side as indicated by the chain line. Then, the sheet
7
a
is pulled by the feed rolls
9
and is sent to the following process (for example, a printing section
10
).
FIG. 9
shows an outline of a sheet feeding apparatus of another type. In this sheet feeding apparatus, delivery rolls
11
are provided under the front stops
4
in place of the kicker
8
, and the vacuum pressure in a vacuum box (suction box)
12
attracts the lowermost sheet
7
a
to the surface of the delivery rolls
11
, so that the sheet
7
a
is delivered by a frictional force.
The above-described conventional sheet feeding apparatuses for a corrugated fiberboard box making machine have problems as described below. For example, if the feed roll
9
wears eccentrically, the feeding force becomes nonuniform in the transverse direction. Also, in the case shown in
FIG. 9
, if the corrugated fiberboard sheet
7
is warped, the contact pressure between the delivery roll
11
and the lowermost sheet
7
a
of the corrugated fiberboard sheets
7
becomes nonuniform in the transverse direction even with the aid of the suction pressure of the vacuum box
12
. Particularly for a corrugated fiberboard sheet with high flexural rigidity such as a double-sided sheet, such tendency is remarkable.
Thus, when a feeding force that is nonuniform in the transverse direction is applied to the corrugated fiberboard sheet
7
under the mechanical condition of eccentric wear of the feed roll
9
or under the condition of warped sheet
7
, the sheet
7
is fed while being turned obliquely at a predetermined angle as shown in FIG.
10
. The sheet
7
fed in this manner decreases the accuracy of box made in the subsequent process. Therefore, the accuracy is kept by a correction, for example, by decreasing the sheet feed speed or by purposely installing the kicker
8
slantwise.
Since such a tendency for oblique turning is often developed by the eccentric wear of the feed roll
9
, the warping of the corrugated fiberboard sheet
7
, and the like as described above, the oblique turning does not occur at random for each corrugated fiberboard sheet
7
, but there is a tendency for all corrugated fiberboard sheets
7
of a certain production lot to be turned obliquely in the same manner.
OBJECT AND SUMMARY OF THE INVENTION
The present invention has been made in view of the above situation, and accordingly an object thereof is to provide a sheet feeding apparatus for a corrugated fiberboard box making machine in which even if corrugated fiberboard sheets have a tendency for oblique turning, the tendency for oblique turning can be adjusted easily.
To solve the problem with the above-described prior art, according to the invention defined in claim
1
, there is provided a sheet feeding apparatus for a corrugated fiberboard box making machine, which has front stops disposed at two locations spaced in the width direction to true up the front edges of stacked corrugated fiberboard sheets and is constructed so as to feed a lowermost corrugated fiberboard sheet successively from the front end side of the front stop, characterized in that the front stops at the two locations are constructed so as to be movable in the longitudinal direction in such a manner as to be capable of supporting the corrugated fiberboard sheets while tilting the front edges thereof obliquely in the longitudinal direction.
According to the invention defined in claim
2
, in the invention according to claim
1
, the front stops are disposed at two locations on a beam which extends in the width direction and can be tilted slantwise in the longitudinal direction with one end thereof in the width direction being a fulcrum, and are constructed so as to support the corrugated fiberboard sheets while tilting the front edges thereof obliquely in the longitudinal direction by moving together with the beam.
According to the invention defined in claim
3
, in the invention according to claim
1
, the front stops are disposed at two locations on a beam extending in the width direction, and are constructed so as to support the corrugated fiberboard sheets while tilting the front edges thereof obliquely in the longitudinal direction by moving individually in the longitudinal direction with respect to the beam.
As described above, in the invention defined in claim
1
, the two front stops are constructed so as to be movable in the longitudinal direction in such a manner as to be capable of supporting the corrugated fiberboard sheets while tilting the front edges thereof obliquely in the longitudinal direction. Therefore, even if corrugated fiberboard sheets have a tendency for oblique turning, the tendency for oblique turning can be adjusted easily to a straight state, for example.
Also, in the invention defined in claim
2
, since the two front stops are disposed on a beam which can be tilted slantwise in the longitudinal direction, the positions and directions of the two front stops can be changed at the same time merely by changing the tilt of the beam. Therefore, the direction of the corrugated fiberboard sheet
7
can be corrected quickly. In addition, the same effect as that of the invention defined in claim
1
can be achieved.
Further, in the invention defined in claim
3
, since the two front stops are moved individually in the longitudinal direction with respect to the beam, the direction of the corrugated fiberboard sheet can easily be adjusted finely.
REFERENCES:
patent: 5113994 (1992-05-01), Mueck
patent: 5147092 (1992-09-01), Driscoll et al.
patent: 5172898 (1992-12-01), Takahashi
patent: 275050 (1914-06-01), None
patent: 2 137 661 (1973-02-01), None
patent: 30 02 594 (1980-08-01), None
patent: 0238020 (1987-09-01), None
patent: 0794140 (1997-09-01), None
Baba Yasuyuki
Hatano Osamu
Alston & Bird LLP
Bollinger David H.
Mitsubishi Heavy Industries Ltd.
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