Continuous paper cutting unit

Details Continuous paper cutting unit Continuous paper cutting unit

2000-04-13

2001-08-28

Rachuba, M. (Department: 3724)

Severing by tearing or breaking

Breaking or tearing apparatus

Combined with preliminary weakener or with nonbreaking cutter

C225S101000, C225S104000, C225S105000

Reexamination Certificate

active

06279805

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a continuous paper cutting unit for cutting perforated continuous paper along the line of perforations.
2. Related Art
A conventional continuous paper cutting unit is shown in
FIG. 56
as described in Japanese Patent Laid-Open No. Hei 6-91588.
FIG.
56
(
a
) depicts a continuous paper cutting unit
1
. Continuous paper
2
having perforations engages a pin tractor
3
and is taken into the continuous paper cutting unit
1
. The continuous paper
2
fed from the pin tractor
3
is transported by means of a paper feed roller
4
and a pinch roller
5
and is further transported past paper cutting boards
6
and
7
, which also function as paper reception beds, by means of a paper discharge roller
8
and a pinch roller
9
. The continuous paper
2
is transported so that its perforations are positioned in a gap between the boards
6
and
7
, and the paper
2
is cut at the perforation position. The cut paper is transported one sheet at a time from the paper reception beds
6
,
7
by the paper discharge roller
8
and the pinch roller
9
and stored in a stacker
10
.
In the paper cutting portion of FIG.
56
(
b
), shafts
11
each having a flange
18
penetrate paper pressers
12
and
12
′ and are fixedly secured to a cutter blade attachment member
13
. A crank
15
attached to a drive shaft
14
transmits motion produced by rotation of the drive shaft
14
via a connecting rod
16
to the cutter blade attachment member
13
. The motion produced by rotation of the drive shaft
14
is reciprocating motion in the vertical direction because a shaft
17
fixedly secured to a cabinet (see FIG.
56
(
e
)) penetrates a hole of the cutter blade attachment member
13
.
The paper pressers
12
,
12
′ are supported by the flanges
18
of the shafts
11
, and the cutter blade
19
and the paper pressers
12
,
12
′ are at a sufficient distance from the paper reception beds
6
,
7
. At this point in time, the paper perforations are transported to the center of the gap between the paper reception beds
6
and
7
(see FIG.
56
(
c
)). As the drive shaft
14
is rotated, the crank
15
rotates, thereby rotating the connecting rod
16
for lowering the cutter blade
19
which is fixedly secured to the cutter blade attachment member
13
. As the cutter blade
19
falls, the shafts
11
also fall, so that the lower face of the paper pressers
12
,
12
′ soon reach the paper reception beds
6
,
7
.
Although the paper pressers
12
and
12
′ abut the paper reception beds
6
and
7
and stop falling, the cutter blade
19
falls further while compressing springs
20
, and the cutter blade
19
soon abuts the perforations of the paper
2
, and tears the paper
2
along the perforations (see FIG.
56
(
d
)). A large force acts on the paper
2
as the cutter blade
19
abuts the perforations, but the paper pressers
12
and
12
′ press the paper due to-the repulsion of the spring
20
. Thus, the paper
2
is not brought into the gap between the paper reception beds
6
and
7
and the cutter blade
19
.
As the drive shaft
14
rotates, the cutter blade
19
rises and soon the paper pressers
12
and
12
′ are pulled up. Then, the paper feed roller
4
and the paper discharge roller
8
rotate to feed the cut paper
2
into the stacker
10
and transport the subsequent portion of continuous paper
2
forward to a predetermined position. The operational sequence is then repeated.
Japanese Patent Laid-Open No. Sho 50-96136 is an example of another conventional continuous paper cutting unit, and is shown in FIG.
57
. In FIG.
57
(
a
), paper reception beds
21
,
22
are placed on a paper discharge passage of a line printer, and continuous paper
2
is discharged from the line printer and guided to the reception beds
21
,
22
.
Up and down movable paper retainers
23
,
24
which act as paper pressers, each having a flat friction face, are pressed down, as required, such that perforations
2
a
of the continuous paper
2
are positioned at a substantial center of a gap between the paper reception beds
21
and
22
. The retainers
23
,
24
press both sides of the perforations
2
a
of the continuous paper
2
against their respective reception bed faces
21
,
22
throughout the paper width. The retainers
23
and
24
have rubber pieces
23
a
and
24
a
for providing a flat friction face at the tip of the retainers
23
,
24
.
To cut the paper
2
along the perforations
2
a,
the paper may be struck at the center throughout the paper width with an up and down movable plate-like blunt instrument
25
, which is rounded at the tip
25
a,
such that both sides of the perforations
2
a
of the continuous paper
2
are sandwiched between the retainers
23
and
24
and the reception beds
21
and
22
.
As shown in FIG.
57
(
b
), a device having a rounded tip
25
a
shaped like a slope is used as the blunt instrument
25
. Since such a blunt instrument would start to press the paper at a lowermost end part
25
a
′, the act of cutting the paper is started at one end of the perforations
2
a
by using the lowermost end part
25
a
′ of the blunt instrument
25
, as shown in FIG.
57
(
d
), to strike against the perforations
2
a.
Therefore, ten paper cutting proceeds from one end of the perforations to the other end as the paper is torn off along the perforations, so that the paper can be cut smoothly.
In Japanese Patent Laid-Open No. Sho 50-96136, a rod 26 pivoting about one point 26
c
as it is swung downward is also disclosed as a blunt instrument, as shown in FIG.
57
(
c
).
Problem 1
In the conventional continuous paper cutting unit shown in
FIG. 56
, after the paper pressers
12
and
12
′ abut the paper reception beds
6
and
7
and stop dropping, the cutter blade
19
must have fallen to the cutting position while the spring
20
is being compressed. Thus, a large drive force is required to lower the cutter blade
19
. That is, a large drive force is required at cutting time.
Problem 2
In the conventional continuous paper cutting unit shown in
FIG. 56
, when the continuous paper
2
is fed or transported to the cutting unit, the edge of the continuous paper
2
easily strikes against the side face of the paper presser
12
or
12
′, thus a paper jam easily occurs.
Likewise, also in the conventional continuous paper cutting unit shown in
FIG. 57
, when the continuous paper
2
is fed or transported to the cutting unit, the edge of the continuous paper
2
easily strikes against the side face of the paper retainers
23
or
24
, and a paper jam easily occurs.
That is, in both the conventional cutting units, it is hard to produce a smooth feed or transport state of continuous paper.
Problem 3
In both the conventional continuous paper cutting units, when continuous paper
2
is transported, the gap between the paper reception beds
6
and
7
(see FIG.
56
(
b
)) or the gap between the reception beds
21
and
22
(see FIG.
57
(
a
)) is open.
Thus, when continuous paper
2
is transported, it enters the gap, easily causing a paper jam to occur.
Problem 4
In the conventional continuous paper cutting unit shown in
FIG. 56
, when the continuous paper
2
is transported, a lower end
19
a
of the cutter blade
19
is positioned somewhat above the lower face (
12
′
a
) of the paper presser
12
,
12
′, as seen in FIG.
56
(
b
).
Therefore, when the continuous paper
2
is supplied to the cutting unit, the edge of the continuous paper
2
easily enters the gap between the paper pressers
12
and
12
′ (below the cutter blade
19
), thus a paper jam easily occurs.
In the conventional cutting unit shown in
FIG. 57
, the opposed face
25
a
of the blunt instrument
25
to the continuous paper
2
is inclined as seen in FIG.
57
(
b
), thus when the continuous paper
2
is transported, a part of the blunt instrument (at least the lowermost end part
25
a
′) projects downward below the lower faces of the retainers
23
and
24
, and

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