Printing – Work supporting members – Grippers
Reexamination Certificate
2001-02-02
2002-02-05
Hilten, John S. (Department: 2854)
Printing
Work supporting members
Grippers
C101S232000, C101S352030, C101S424000
Reexamination Certificate
active
06343551
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a support structure for a cylinder, and particularly, a support structure which is very useful when applied in supporting a plate cylinder of a printing press.
2. Description of the Related Art
A conventional support structure for a plate cylinder of a printing press will be explained with reference to
FIGS. 3
to
5
.
FIG. 3
is a side view showing a support structure on an operation side of a plate cylinder.
FIG. 4
is a sectional view of FIG.
3
.
FIG. 5
is a side view showing a support structure on a drive side of the plate cylinder. As shown in
FIGS. 3 and 4
, an eccentric slide bearing
11
a
, which is a first eccentric bearing having an external diameter and an internal diameter different in axis position, is rotatably supported on a support frame
10
a
on the operation side. An outer race
12
aa
of an eccentric roller bearing
12
a
, which is a second eccentric bearing with different axis positions of the outer race
12
aa
and an inner race
12
ab
, is rotatably supported by the eccentric slide bearing
11
a
. The inner race
12
ab
of the eccentric roller bearing
12
a
supports an end portion of a shaft on the operation side of a plate cylinder
101
. A fan-shaped dog
13
a
having a tooth space in an outer peripheral portion thereof is attached to an edge portion of the eccentric slide bearing
11
a
. The dog
13
a
is engaged with a pinion
14
a
, and the pinion
14
a
is rotated by a drive source (not shown). An annular plate
15
is attached to an end portion of the outer race
12
aa
of the eccentric roller bearing
12
a
. The annular plate
15
has the same dimensions as the internal and external diameters of the outer race
12
aa
, and has a flange
15
a.
As shown in
FIG. 3
, a casing
16
is attached to the support frame
100
a
. Inside the casing
16
, a drive shaft
17
having an axis in a direction perpendicular to the axial direction of the plate cylinder
101
is rotatably supported. To the drive shaft
17
, a worm wheel
18
is attached coaxially with the drive shaft
17
. The worm wheel
18
is engaged with a worm gear
19
. The worm gear
19
is rotated by a drive source (not shown). A base end portion (lower end portion) of a threaded shaft
20
is screwed to a front end portion (upper end portion) of the drive shaft
17
. The threaded shaft
20
is rotatably supported by a support member
21
fixed to the support frame
100
a
. A base end portion of a connecting rod
22
is connected to a front end portion (upper end portion) of the threaded shaft
20
. A front end portion of the connecting rod
22
is rotatably connected to the flange
15
a
of the annular plate
15
via a connecting pin
23
. A rotary encoder
24
is connected to a base end portion (lower end portion) of the drive shaft
17
. The annular plate
15
, casing
16
, drive shaft
17
, worm wheel
18
, worm gear
19
, threaded shaft
20
, support member
21
, connecting rod
22
, and connecting pin
23
, which have been described above, constitute second rotating means in the present conventional example.
As shown in
FIG. 5
, an eccentric slide bearing
11
b
, which is the other first eccentric bearing having an external diameter and an internal diameter different in axis position, is rotatably supported on a support frame
100
b
on the drive side. An outer race
12
ba
of a roller bearing
12
b
, which has the outer race
12
ba
and an inner race
12
bb
consistent in axis, is rotatably supported by the eccentric slide bearing
11
b. The inner race
12
bb
of the roller bearing
12
b
supports an end portion of a shaft on the drive side of the plate cylinder
101
. A fan-shaped dog
13
b having a tooth space in an outer peripheral portion thereof is attached to an edge portion of the eccentric slide bearing
11
b
. The dog
13
b
is engaged with a pinion
14
b
. The pinion
14
b
is connected to the drive source that drives and rotates the pinion
14
a
on the operation side, and can be rotated in the same amount as is the pinion
14
a
on the operation side. These dogs
13
a
,
13
b
, the pinions
14
a
,
14
b
, and the drive source, which have been described above, constitute first rotating means in the present conventional example. The reference numeral
102
denotes a blanket cylinder.
According to the foregoing support structure, when the drive source is actuated to rotate the pinions
14
a
,
14
b
in the same amount, the eccentric slide bearings
11
a
,
11
b
are rotated via the dogs
13
a
,
13
b
. As a result, the axes Oa, Ob of the plate cylinder
101
move about the eccentric axes Oa
1
, Ob
1
of the eccentric slide bearings
11
a
,
11
b
via the roller bearings
12
a
,
12
b
. Thus, the distance between the axes O, O of the blanket cylinder
102
and the axes Oa, Ob of the plate cylinder
101
, namely, the distance between the outer peripheral surfaces of the blanket cylinder
102
and the plate cylinder
101
can be changed. By this measure, an object to be printed, such as a sheet, can be printed at an appropriate printing pressure in accordance with, for example, the thickness of the object to be printed. When the worm gear
19
is rotated to rotate the worm wheel
18
, the drive shaft
17
rotates. In accordance with the rotation of the drive shaft
17
, the threaded shaft
20
ascends or descends. As a result, the annular plate
15
rotates via the connecting rod
22
and the connecting pin
23
, whereupon the outer race
12
aa
of the eccentric roller bearing
12
a
rotates. Thus, the axis Oa on the operation side of the plate cylinder
101
moves about the eccentric axis Oa
2
of the eccentric roller bearing
12
a
via the inner race
12
ab
. That is, the axis Oa on the operation side of the plate cylinder
101
can be displaced relative to the axis of the blanket cylinder
102
about the axis Ob on the drive side of the plate cylinder
101
. By this measure, displacement of the printing position in accordance with a change, for example, in the thickness of the object to be printed, such as a sheet, can be corrected.
In the above-described support structure, the second rotating means is connected only to the eccentric roller bearing
12
a
on the operation side of the plate cylinder
101
. Thus, if it is attempted to adjust the printing pressure by actuating the first rotating means as stated earlier, rotation of the eccentric roller bearing
12
a
on the operation side of the plate cylinder
101
is restrained by the second rotating means. As a result, a difference arises between the amount of movement of the axis Oa on the operation side of the plate cylinder
101
and the amount of movement of the axis Ob on the drive side of the plate cylinder
101
. This results in cocking of the plate cylinder
101
.
SUMMARY OF THE INVENTION
The present invention has been accomplished to solve the above-described problem.
According to the present invention, there is provided a support structure for a cylinder, comprising:
a pair of frames;
a pair of first eccentric bearings rotatably supported on the frames;
a pair of second eccentric bearings rotatably supported by the first eccentric bearings and rotatably supporting end portions of a shaft of the cylinder;
first rotating means for rotating the first eccentric bearings relative to the frames in a same amount;
second rotating means for rotating one of the second eccentric bearings relative to one of the frames; and
restraining means for restraining rotation of the other second eccentric bearing relative to the other frame.
In the above support structure, the restraining means may have a connecting rod having one end portion rotatably connected to the other second eccentric bearing, and having the other end portion rotatably connected to the other frame.
According to the cylinder support structure of the present invention, the restraining means restrains rotation of the other second eccentric bearing. As a result, the one second eccentric bearing and the other second eccentric bearing move in the same manner. Thus, there is no differ
Hayasaka Tomoyuki
Kamiyama Jun
Crenshaw Marvin P.
Hilten John S.
Komori Corporation
LandOfFree
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