AU2018202781B2 - Printing Apparatus - Google Patents

Abstract

To adjust a print pressure and to move a plate cylinder relative to an impression cylinder by a simple mechanism while preventing a change in a contact pressure between the plate cylinder and an anilox roll. A pair of supporting shafts 5, 6 is opposed with each other across the web 2. A plate cylinder sleeve 7 and an impression cylinder sleeve 8 are detachably attached to supporting shafts 5, 6 different from each other. An ink supply device 40 includes an anilox roll 41 and is moved in alignment with a position of the plate cylinder sleeve 7 attached to a supporting shaft 5 or 6. A turning body 50 holds one of the pair of supporting shafts 5, 6 and is turned together with one supporting shaft 5. A center of rotation 43 of the anilox roll 41 is matched with a center of turning 51 of the turning body 50, when the ink supply device 40 has been moved in alignment with the position of the plate cylinder sleeve 7 attached to the one supporting shaft 5. 1/12 Fig. 1 1 20 4 2B 22 -~lit FzF -22A 303 r '- -----LL i 60

Description

1/12

Fig. 1

1 20

4

2B 22

FzF -~lit

-22A

303 r '- -----LL i

PRINTING APPARATUS

Technical Field

[0001]

The present invention relates to a printing apparatus

capable of switching between front face printing of a web and

rear face printing of the web.

Background art

[0002]

In a printing apparatus printing on a web by a plate

cylinder and an impression cylinder, print pressure applied to

the web is adjusted by moving at least one of the plate cylinder

and the impression cylinder so as to separate from each other

or to make contact with each other.

Under the condition, ink is supplied from an anilox roll

to the plate cylinder, and the web is passed through between

the plate cylinder and the impression cylinder.

The printing apparatus performs printing on each face of

the web by switching between front face printing of the web

and rear face printing of the web.

As such printing apparatus, a roll paper rotary printing

apparatus capable of switching between a plate cylinder and an

impression cylinder with each other has been known (see patent

document 1).

[0003]

In the conventional printing apparatus described in the

patent document 1, the plate cylinder and the impression

cylinder are connected to a carriage respectively.

The carriage is movably supported by a guide member.

A flexographic printing ink device includes a chamber

doctor and an anilox roll and comes into contact with a sleeve

like flexographic printing plate of the plate cylinder.

The flexographic printing ink device is moved

simultaneously with a movement of the plate cylinder by fixing

the flexographic printing ink device together with the plate

cylinder to the carriage.

[0004]

In the conventional printing apparatus, a sleeve is pulled

out of a main body of the impression cylinder and the

flexographic printing plate is put on the main body of the

impression cylinder, and the flexographic printing plate is

pulled out of a main body of the plate cylinder and the sleeve

is put on the main body of the plate cylinder.

Thereby, the impression cylinder is switched to the plate

cylinder, and the plate cylinder is switched to the impression

cylinder.

The flexographic printing ink device is detached from a

former carriage and fixed to another carriage in a reversed

direction.

[00051

In the conventional printing apparatus, when only one

cylinder (e.g. plate cylinder) is moved, the other cylinder

(e.g. impression cylinder) is connected to inner walls of side

walls by bearings.

A bearing is attached to an inner wall by screws.

Moreover, the printing apparatus includes screw nuts, screw shafts and a driving means for the screw shafts to move each carriage.

As stated above, in the conventional printing apparatus,

its structure is apt to be complicated, and a lot of work to

adjust each mechanism is feared to be required.

Moreover, the printing apparatus becomes bigger in size,

and the number of components is feared to be increased.

Therefore there is a concern over a cost increase of the

printing apparatus.

[00061

Whereas, a sheet printing apparatus in which a plate

cylinder is moved relative to an impression cylinder by a

double eccentric mechanism has been also known. In this

conventional sheet printing apparatus, the plate cylinder or

the impression cylinder is supported by the double eccentric

mechanism.

The double eccentric mechanism includes an outer

eccentric bearing and an inner eccentric bearing arranged

inside the outer eccentric bearing.

The print pressure is adjusted by a movement of the plate

cylinder or the impression cylinder due to two eccentric

movements of the double eccentric mechanism.

In addition, the plate cylinder and the impression

cylinder are separated from each other or are made contact

with each other by the movement of the plate cylinder or the

impression cylinder.

However, the double eccentric mechanism is required to

increase the number of components, and to process the components accurately.

Accordingly, the printing apparatus is feared to be

increased in cost, and since it is also required to move the

double eccentric mechanism accurately, there is a problem that

a lot of work to adjust the print pressure is required.

Prior art document

Patent document

[0007]

[Patent Document 1] Japanese Patent Laid open No.2002-254598

Summary of the Invention

[0008]

The present invention is made in view of the above

mentioned conventional problems. Thus, it is desirable to

provide a printing apparatus that can adjust a print pressure

and move a plate cylinder relative to an impression cylinder

by a simple mechanism, while preventing a change in a contact

pressure between the plate cylinder and an anilox roll in the

printing apparatus capable of switching between front face

printing of a web and rear face printing of the web.

[0009]

In accordance with an aspect of the present invention,

there is provided a printing apparatus capable of switching

between front face printing of a web and rear face printing of

the web by exchanging positions of a plate cylinder and an

impression cylinder relative to the web.

The printing apparatus includes a pair of supporting

shafts opposed with each other across the web, a plate cylinder sleeve and an impression cylinder sleeve detachably attached to supporting shafts different from each other, the supporting shafts to be attached being changeable, an ink supply device including an anilox roll and being movable in alignment with a position of the plate cylinder sleeve attached to a supporting shaft, and a turning body holding one of the pair of supporting shafts and being turned together with one supporting shaft.

A center of rotation of the anilox roll is matched with

a center of turning of the turning body, when the ink supply

device has been moved in alignment with the position of the

plate cylinder sleeve attached to one supporting shaft.

Advantageous Effects of the Invention

[0010]

According to the present invention, it is possible to

adjust the print pressure and to move the plate cylinder

relative to the impression cylinder by the simple mechanism,

while preventing a change in contact pressure between the plate

cylinder and the anilox roll in the printing apparatus capable

of switching between front face printing of the web and rear

face printing of the web.

Brief Description of the Drawings

[0011]

Fig.1 is a front view of a printing apparatus of the

present embodiment.

Fig.2 is a rear view of the printing apparatus of the

present embodiment.

Fig.3 is a schematic view of the printing apparatus of the present embodiment.

Fig.4 is a schematic view of a main part of the printing

apparatus of the present embodiment.

Fig.5 is a schematic view of a main part of the printing

apparatus of the present embodiment.

Fig.6 is a schematic view of a structure of the printing

apparatus when printing on a front face of a web.

Fig.7 is a schematic view of the printing apparatus when

printing on the front face of the web.

Fig.8 is a schematic view of the printing apparatus when

printing on the front face of the web.

Fig.9 is a view of a part of Fig.3 containing a plate

cylinder and an impression cylinder and a rotation device.

Fig.10 is a schematic view of a turning body shown in

Fig.5 in a turned state.

Fig.11 is a sectional view of the turning body and a

turning device attached to a main body frame.

Fig.12 is a view of a print pressure adjusting mechanism

viewed in an arrow X3 direction illustrated in Fig.11.

Description of the Embodiments

[0012]

An embodiment of a printing apparatus of the present

invention will be described with reference to the drawings.

A printing apparatus of the present embodiment is the

printing apparatus capable of switching between front face

printing of a web and rear face printing of the web.

The web is a belt-like printing sheet which is wound into

a roll shape.

The web is supplied from a supply device to the printing

apparatus, and images are printed on the web by the printing

apparatus.

The printing apparatus of the present embodiment is a

flexographic printing apparatus, and images are printed on the

web by a plate (letter press) of the plate cylinder.

[0013]

Fig.1 is a front view of a printing apparatus 1 of the

present embodiment, and shows the printing apparatus 1 viewed

from one side in a width direction of a web 2.

Fig.2 is a rear view of the printing apparatus 1 of the

present embodiment, and shows the printing apparatus 1 viewed

from the other side in the width direction of the web 2.

As shown in the drawings, the printing apparatus 1 is

provided with a plate cylinder 3, an impression cylinder 4, a

rotation device 10 for rotating the plate cylinder 3 and the

impression cylinder 4, a main body frame 20, a sub frame 30

detachably attached to the main body frame 20, an ink supply

device 40 held by the sub frame 30, a turning body 50 turnably

connected to the main body frame 20, and a turning device 60

for turning the turning body 50.

The plate cylinder 3 is rotatably supported by the turning

body 50, and the impression cylinder 4 is rotatably supported

by the main body frame 20.

A diameter of the plate cylinder 3 is the same as that of

the impression cylinder 4.

[0014]

The web 2 is moved in a predetermined moving direction F in the printing apparatus 1 to pass through between the plate cylinder 3 and the impression cylinder 4.

At that time, the printing apparatus 1 prints images on

one face of the web 2.

The plate cylinder 3 and the impression cylinder 4 are

opposed with each other across the web 2 and are in contact

with the one face and the other face of the web 2 respectively.

The web 2 is sandwiched between the plate cylinder 3 and

the impression cylinder 4.

Here, the moving direction F of the web 2 is horizontal.

Furthermore, the one face of the web 2 is a rear face 2A

of the web 2, and the other face of the web 2 is a front face

2B of the web 2.

The plate cylinder 3 is located on the rear face 2A side

of the web 2, and the impression cylinder 4 is located on the

front face 2B side of the web 2.

[0015]

Fig.3 is a schematic view of the printing apparatus 1 of

the present embodiment, containing a sectional view of a part

of the printing apparatus 1.

Further, Fig.3 shows each part of the printing apparatus

1 in one drawing by combining.

Figs.4, 5 are schematic views of a main part of the

printing apparatus 1 of the present embodiment and show a part

of the printing apparatus 1 taken along the line X1-X1 of Fig.3

in a simple manner.

Fig.4 shows the printing apparatus 1 before the sub frame

is attached to the main body frame 20, and Fig.5 shows the printing apparatus 1 after the sub frame 30 is attached to the main body frame 20.

[0016]

As shown in the drawings, a center of an outer peripheral

surface of the plate cylinder 3 and a center of an outer

peripheral surface of the impression cylinder 4 are arranged

horizontally and in parallel with each other in the same

vertical plane.

Under the condition, the plate cylinder 3 and the

impression cylinder 4 are arranged to be in parallel and

opposed with each other in a vertical direction.

Moreover, the printing apparatus 1 is provided with a

pair of supporting shafts 5, 6 (a first supporting shaft 5, a

second supporting shaft 6) which is a shaft member of the plate

cylinder 3 and the impression cylinder 4, respectively, a plate

cylinder sleeve 7 which is an outer peripheral member of the

plate cylinder 3, and an impression cylinder sleeve 8 which is

an outer peripheral member of the impression cylinder 4.

[0017]

The pair of supporting shafts 5, 6 is arranged in parallel

and arranged in the width direction of the web 2.

Specifically, centers of outer peripheral surfaces of

supporting shafts 5, 6 are arranged horizontally and in

parallel with each other in the same vertical plane as is the

case with the plate cylinder 3 and the impression cylinder 4.

Under the condition, the pair of supporting shafts 5, 6

is arranged to be in parallel and opposed with each other in

the vertical direction.

Moreover, the web 2 is arranged between the pair of

supporting shafts 5, 6, and the pair of supporting shafts 5,

6 is opposed with each other across the web 2.

[0018]

Here, the first supporting shaft 5 is a lower supporting

shaft located on a lower side of the web 2, and the second

supporting shaft 6 is an upper supporting shaft located on an

upper side of the web 2.

Supporting shafts 5, 6 are rotated around centers of

rotation, respectively.

The plate cylinder sleeve 7 and the impression cylinder

sleeve 8 are formed in a cylindrical shape and attached to

outer peripheral parts (attaching parts 5A, 6A) of the

supporting shafts 5, 6.

The plate cylinder sleeve 7 and the impression cylinder

sleeve 8 are held by the supporting shafts 5, 6 and are rotated

integrally with the supporting shafts 5, 6.

[0019]

The plate cylinder sleeve 7 and the impression cylinder

sleeve 8 are attachable to both of the pair of supporting

shafts 5, 6, respectively.

Therefore, an attaching part 5A of the first supporting

shaft 5 and an attaching part 6A of the second supporting shaft

6 are formed in the same shape.

The plate cylinder sleeve 7 and the impression cylinder

sleeve 8 are detachably attached to the supporting shafts 5,

6 different from each other, and the supporting shafts 5, 6 to

be attached are changeable.

When the plate cylinder sleeve 7 is attached to one of

the pair of supporting shafts 5, 6, the plate cylinder 3 is

made by the plate cylinder sleeve 7 and one supporting shaft.

Moreover, when the impression cylinder sleeve 8 is

attached to the other of the pair of supporting shafts 5, 6,

the impression cylinder 4 is made by the impression cylinder

sleeve 8 and the other supporting shaft.

[0020]

In the printing apparatus 1, the rear face printing

(printing on one face (rear face 2A)) of the web 2 and the

front face printing (printing on the other face (front face

2B)) of the web 2 are switched by exchanging positions of the

plate cylinder 3 and the impression cylinder 4 with respect to

the web 2.

At that time, the front face printing and the rear face

printing can be switched without changing the moving direction

F of the web 2.

Moreover, the front face printing and the rear face

printing can be switched without changing each rotational

direction of the pair of supporting shafts 5, 6.

When the positions of the plate cylinder 3 and the

impression cylinder 4 are exchanged, the plate cylinder sleeve

7 and the impression cylinder sleeve 8 are exchanged

corresponding to the positions of the plate cylinder 3 and the

impression cylinder 4.

[0021]

When printing on the rear face of the web 2 (see Figs.3,

4, 5), the plate cylinder sleeve 7 is attached to the first supporting shaft 5, and the impression cylinder sleeve 8 is attached to the second supporting shaft 6.

The plate cylinder sleeve 7 and the plate cylinder 3 are

located on the lower side (the rear face 2A side) of the web

2 and arranged along the rear face 2A of the web 2.

The impression cylinder sleeve 8 and the impression

cylinder 4 are located on the upper side (the front face 2B

side) of the web 2 and arranged along the front face 2B of the

web 2.

The printing apparatus 1 prints images on the rear face

2A of the web 2 moving between the plate cylinder 3 (the plate

cylinder sleeve 7) and the impression cylinder 4 (the

impression cylinder sleeve 8).

[00221

Fig.6 is a schematic view of a structure of the printing

apparatus 1 when printing on the front face of the web 2 and

shows each part of the printing apparatus 1 in one drawing by

combining as with in Fig.3.

Figs.7, 8 are schematic views of the printing apparatus

1 when printing on the front face of the web 2, and show a

part of the printing apparatus 1 taken along the line X2-X2 of

Fig.6 in a simple manner.

Fig.7 shows the printing apparatus 1 before the sub frame

is attached to the main body frame 20, and Fig.8 shows the

printing apparatus 1 after the sub frame 30 is attached to the

main body frame 20.

[0023]

As shown in the drawings, when printing on the front face of the web 2, the impression cylinder sleeve 8 is attached to the first supporting shaft 5, and the plate cylinder sleeve 7 is attached to the second supporting shaft 6.

The impression cylinder sleeve 8 and the impression

cylinder 4 are located on the lower side (the rear face 2A

side) of the web 2 and arranged along the rear face 2A of the

web 2.

The plate cylinder sleeve 7 and the plate cylinder 3 are

located on the upper side (the front face 2B side) of the web

2 and arranged along the front face 2B of the web 2.

The printing apparatus 1 prints images on the front face

2B of the web 2 moving between the plate cylinder 3 and the

impression cylinder 4.

[0024]

When exchanging the plate cylinder sleeve 7 with the

impression cylinder sleeve 8, the plate cylinder sleeve 7 and

the impression cylinder sleeve 8 are moved toward one sides in

axial directions of each of the supporting shafts 5, 6 (one

ends 5B, 6B sides of each of the supporting shafts 5, 6) and

detached from each of the supporting shafts 5, 6.

Then, the supporting shafts 5, 6 to which the plate

cylinder sleeve 7 and the impression cylinder sleeve 8 to be

attached are changed, and the plate cylinder sleeve 7 and the

impression cylinder sleeve 8 to be attached to the pair of

supporting shafts 5, 6 are exchanged.

The positions of the plate cylinder 3 and the impression

cylinder 4 with respect to the web 2 are exchanged by

exchanging the plate cylinder sleeve 7 and the impression cylinder sleeve 8.

At that time, the plate cylinder sleeve 7 and the

impression cylinder sleeve 8 are moved toward the other sides

in the axial directions of each of the supporting shafts 5, 6

(the other ends 5C, 6C sides of each of the supporting shafts

, 6), then, the supporting shafts 5, 6 are inserted into the

plate cylinder sleeve 7 and the impression cylinder sleeve 8.

The plate cylinder sleeve 7 and the impression cylinder

sleeve 8 are fitted to the supporting shafts 5, 6 after being

changed and are fixed to the supporting shafts 5, 6 different

from each other by fixing members 5D, 6D respectively.

[0025]

Fig.9 is a view of a part of Fig.3 containing the plate

cylinder 3 and the impression cylinder 4 and the rotation

device 10.

As shown in the drawing, the rotation device 10 includes

a motor 11 and a transmission mechanism 12, and is attached to

the main body frame 20.

The transmission mechanism 12 includes a first

transmission gear 13 fixed to an output shaft of the motor 11,

a second transmission gear 14 meshed with the first

transmission gear 13,and a third transmission gear 15.

The third transmission gear 15 is coaxially arranged with

the second transmission gear 14 and rotated integrally with

the second transmission gear 14.

The rotation device 10 rotates transmission gears 13, 14,

of the transmission mechanism 12 by the motor 11.

[0026]

The printing apparatus 1 is provided with interlocking

gears 16, 17 rotating in interlock with the pair of supporting

shafts 5, 6.

The interlocking gears 16, 17 are fixed to the other ends

C, 6C of the pair of supporting shafts 5, 6 and are rotated

integrally with the supporting shafts 5, 6.

The third transmission gear 15 of the transmission

mechanism 12 is meshed with an interlocking gear 17 of the

second supporting shaft 6, and the interlocking gear 17 of the

second supporting shaft 6 is meshed with an interlocking gear

16 of the first supporting shaft 5.

The rotation device 10 rotates the interlocking gears 16,

17, the second supporting shaft 6 and the first supporting

shaft 5 by transmitting a rotation of the motor 11 to the

interlocking gear 17 of the second supporting shaft 6 by the

third transmission gear 15.

Accordingly, the plate cylinder 3 and the impression

cylinder 4 are rotated in interlock with each other within the

main body frame 20.

[0027]

The main body frame 20 is a base frame of the printing

apparatus 1, and rotatably supports the second supporting shaft

6 (see Figs.3, 6).

Moreover, the main body frame 20 includes a pair of frame

parts 21, 22 (a first frame part 21, a second frame part 22)

opposed with each other, two openings for exchange 23, 24 (a

first opening for exchange 23, a second opening for exchange

24) formed in the first frame part 21, and a housing 25 arranged in the second opening for exchange 24.

The frame parts 21, 22 are arranged away from each other

in the axial directions of the supporting shafts 5, 6.

The plate cylinder sleeve 7 and the impression cylinder

sleeve 8 are arranged between the pair of frame parts 21, 22.

[0028]

The openings for exchange 23, 24 are openings for exchange

of the plate cylinder sleeve 7 and the impression cylinder

sleeve 8, and are formed in the first frame part 21

corresponding to positions of the pair of supporting shafts 5,

6.

Sizes of the openings for exchange 23, 24 are larger than

diameters of the plate cylinder sleeve 7 and the impression

cylinder sleeve 8, and the plate cylinder sleeve 7 and the

impression cylinder sleeve 8 may pass through the openings for

exchange 23, 24.

The housing 25 is arranged in the second opening for

exchange 24 of the first frame part 21, and is detachably

attached in the second opening for exchange 24.

At that time, the housing 25 is inserted into the second

opening for exchange 24 from the outside of the main body frame

and is attached in the second opening for exchange 24.

The second opening for exchange 24 is closed by attaching

the housing 25 in the second opening for exchange 24.

Moreover, the housing 25 is drawn out of the second

opening for exchange 24 to the outside of the main body frame

, and whereby the housing 25 is detached from the second

opening for exchange 24.

The second opening for exchange 24 is opened by detaching

the housing 25 from the second opening for exchange 24.

[0029]

The second supporting shaft 6 includes a first supporting

part 6E located on the one end 6B side, and a second supporting

part 6F located on the other end 6C side.

The housing 25 is a supporting member for supporting the

first supporting part 6E of the second supporting shaft 6, and

is connected to the first supporting part 6E of the second

supporting shaft 6, when attached in the second opening for

exchange 24.

The main body frame 20 rotatably supports the first

supporting part 6E of the second supporting shaft 6 by the

housing 25 of the first frame part 21 and rotatably supports

the second supporting part 6F of the second supporting shaft

6 by the second frame part 22.

[00301

When the housing 25 is detached from the second opening

for exchange 24, support by the first supporting part 6E of

the second supporting shaft 6 is released, and the second

supporting shaft 6 is supported only by the second supporting

part 6F.

Under the condition, the impression cylinder sleeve 8 or

the plate cylinder sleeve 7 can be drawn out of the main body

frame 20 through the second opening for exchange 24, and the

impression cylinder sleeve 8 or the plate cylinder sleeve 7

can be detached from the second supporting shaft 6.

Moreover, the plate cylinder sleeve 7 or the impression cylinder sleeve 8 can be inserted into the main body frame 20 through the second opening for exchange 24, and the plate cylinder sleeve 7 or the impression cylinder sleeve 8 can be attached to the second supporting shaft 6.

Accordingly, on the second supporting shaft 6, the

impression cylinder sleeve 8 is exchanged with the plate

cylinder sleeve 7, or the plate cylinder sleeve 7 is exchanged

with the impression cylinder sleeve 8.

[0031]

The main body frame 20 includes two openings 26, 27 (a

first opening 26, a second opening 27) (see Figs.4, 5, 7, 8)

provided between the pair of frame parts 21, 22 (see Fig.3).

The two openings 26, 27 are openings for attaching the

sub frame 30 and the ink supply device 40 and are formed on a

side face of the main body frame 20.

Moreover, the two openings 26, 27 are provided on each

side of the supporting shafts 5, 6 with respect to the web 2

and opposed with each other across the web 2.

Here, the first opening 26 is a lower opening located on

the lower side (the first supporting shaft 5 side) of the web

2, and the second opening 27 is an upper opening located on

the upper side (the second supporting shaft 6 side) of the web

2.

[0032]

The sub frame 30 is a cassette attachable to the two

openings 26, 27 respectively, and assists the ink supply device

in attaching in each of openings 26, 27.

The printing apparatus 1 is provided with a guide member

28 attachable to each of the two openings 26, 27.

The sub frame 30 and the guide member 28 are arranged in

an opening 26 or 27 different from each other and detachably

attached in the opening 26 or 27.

The guide member 28 is attached in the opening 26 or 27

before the sub frame 30 is attached in the opening 26 or 27

and guides the sub frame 30 to be attached in the opening 26

or 27.

[00331

The guide member 28 is attached in the opening 26 or 27

on the supporting shaft 5 or 6 side to which the impression

cylinder sleeve 8 is attached.

The guide member 28 is formed in a block like shape and

closes at least a part of each opening 26 or 27.

The sub frame 30 is attached in the opening 26 or 27 on

the supporting shaft 5 or 6 side to which the plate cylinder

sleeve 7 is attached.

At that time, the sub frame 30 is inserted into the

opening 26 or 27 while being guided by the guide member 28 and

arranged in the opening 26 or 27.

[0034]

The guide member 28 is attached in the opening 26 or 27

which is on the impression cylinder 4 side, and the sub frame

is attached in the opening 26 or 27 which is on the plate

cylinder 3 side.

Accordingly, when printing on the rear face of the web

2 (see Figs.4, 5), the guide member 28 is attached in the

second opening 27 on the second supporting shaft 6 side to which the impression cylinder sleeve 8 is attached.

The sub frame 30 is attached in the first opening 26 on

the first supporting shaft 5 side to which the plate cylinder

sleeve 7 is attached.

Whereas, when printing on the front face of the web 2

(see Figs.7, 8), the guide member 28 is attached in the first

opening 26 on the first supporting shaft 5 side to which the

impression cylinder sleeve 8 is attached.

The sub frame 30 is attached in the second opening 27 on

the second supporting shaft 6 side to which the plate cylinder

sleeve 7 is attached.

[00351

The ink supply device 40 is a movable cassette type ink

unit and is fixed to another sub frame 30 different from the

main body frame 20.

Moreover, the ink supply device 40 includes a rotatable

anilox roll 41 and an ink doctor chamber device 42 supplying

ink to the anilox roll 41.

Along with an exchange of the positions of the plate

cylinder 3 and the impression cylinder 4,the ink supply device

is moved in alignment with a position of the plate cylinder

sleeve 7 attached to the supporting shaft 5 or 6,and is

attached in the opening 26 or 27 of the main body frame 20.

The anilox roll 41 is in contact with the plate cylinder

sleeve 7 of the plate cylinder 3, and is rotated around a

center of rotation 43 in interlock with a rotation of the plate

cylinder 3.

The ink supply device 40 supplies ink to the plate cylinder sleeve 7 by the anilox roll 41.

[00361

The sub frame 30 and the ink supply device 40 are moved

integrally toward each of the two openings 26, 27 of the main

body frame 20 and are attached in the opening 26 or 27 which

is a destination of moving.

Moreover, along with the exchange of the positions of the

plate cylinder 3 and the impression cylinder 4, the sub frame

is moved integrally with the ink supply device 40 in

alignment with the position of the plate cylinder sleeve 7

attached to the supporting shaft 5 or 6, and is attached in

the opening 26 or 27 on the supporting shaft 5 or 6 side to

which the plate cylinder sleeve 7 is attached.

The ink supply device 40 is attached in the opening 26 or

27 on the plate cylinder 3 side through the sub frame 30.

The anilox roll 41 is made to contact with the plate

cylinder sleeve 7, and the ink supply device 40 supplies ink

to the plate cylinder sleeve 7 while the sub frame 30 is

attached in the opening 26 or 27.

[0037]

The printing apparatus 1(see Figs.3, 6) is provided with

a drive gear 18 fixed to the plate cylinder 3, a driven gear

19 fixed to the anilox roll 41 and a moving device 44 for

moving the anilox roll 41.

The drive gear 18 is attached to an end on the second

frame part 22 side of the plate cylinder sleeve 7.

When exchanging the plate cylinder sleeve 7 with the

impression cylinder sleeve 8, the drive gear 18 is moved integrally with the plate cylinder sleeve 7 such that the drive gear 18 is fitted to the supporting shaft 5 or 6.

The driven gear 19 is attached to an end on the second

frame part 22 side of the anilox roll 41 and is meshed with

the drive gear 18.

The drive gear 18 is rotated together with the plate

cylinder sleeve 7, whereby the driven gear 19 and the anilox

roll 41 are rotated.

[00381

The moving device 44 includes a pair of moving mechanisms

A, 45B (a first moving mechanism 45A, a second moving

mechanism 45B) provided on a pair of frame members 31, 32 (a

first frame member 31, a second frame member 32) of the sub

frame 30.

The pair of frame members 31, 32 is arranged on the both

sides of the ink supply device 40 in an axial direction of the

anilox roll 41 and is attached to the ink supply device 40.

Moreover, the first frame member 31 is attached to the

first frame part 21 of the main body frame 20, and the second

frame member 32 is attached to the second frame part 22 of the

main body frame 20.

[00391

The pair of moving mechanisms 45A, 45B is connected to

ends different from each other (one end on the first frame

member 31 side, the other end on the second frame member 32

side) of the anilox roll 41, and moves ends of the anilox roll

41 respectively.

Each of moving mechanisms 45A, 45B includes a movable member 46 for rotatably supporting the ends of the anilox roll

41, a driving part 47 for moving the movable member 46, and a

position adjusting part 48 for adjusting positions of the ends

of the anilox roll 41.

In each of moving mechanisms 45A, 45B, the movable member

46 is arranged along the frame member 31 or 32 of the sub frame

and is extended from an end of the anilox roll 41 to the

driving part 47.

Moreover, the movable member 46 is movably connected to

the frame member 31 or 32, and is moved toward or away from

the plate cylinder sleeve 7 together with the end of the anilox

roll 41.

[0040]

The driving part 47 is a piston-cylinder mechanism, and

is connected to the frame member 31 or 32 and the movable

member 46.

The driving part 47 moves the end of the anilox roll 41

toward or away from the plate cylinder sleeve 7 by moving the

movable member 46.

The moving device 44 moves both ends of the anilox roll

41 away from the plate cylinder sleeve 7 by the pair of moving

mechanisms 45A, 45B to separate the anilox roll 41 from the

plate cylinder sleeve 7.

Moreover, the moving device 44 moves the both ends of the

anilox roll 41 toward the plate cylinder sleeve 7 by the pair

of moving mechanisms 45A, 45B to make the anilox roll 41

contact with the plate cylinder sleeve 7.

[0041]

The anilox roll 41 is pressed against the plate cylinder

sleeve 7 by the pair of moving mechanisms 45A, 45B of the

moving device 44. Under the condition, the both ends of the

anilox roll 41 are moved by position adjusting parts 48 of the

pair of moving mechanisms 45A, 45B respectively to adjust

positions of the both ends of the anilox roll 41.

A position adjusting part 48 includes an adjusting screw

48A extending through a screw hole of the movable member 46,

and a handle 48B to rotate the adjusting screw 48A.

The adjusting screw 48A is projected from the movable

member 46, whereby a distal end of the adjusting screw 48A is

pressed against the frame member 31 or 32.

A length of projection of the adjusting screw 48A is

changed by rotating the adjusting screw 48A by the handle 48B.

At the same time, the movable member 46 is moved along

the adjusting screw 48A, thus a position of the movable member

46 with respect to the frame member 31 or 32 is shifted.

Accordingly, the movable member 46 and the ends of the

anilox roll 41 are moved toward or away from the plate cylinder

sleeve 7.

[0042]

By virtue of the position adjusting parts 48 of the pair

of moving mechanisms 45A, 45B, the positions of the both ends

of the anilox roll 41 are adjusted and a contact pressure

between the plate cylinder 3 (the plate cylinder sleeve 7) and

the anilox roll 41 is adjusted.

Accordingly, the position adjusting part 48 is also a

contact pressure adjusting part.

When the anilox roll 41 is moved away from the plate

cylinder sleeve 7 by the position adjusting parts 48, the

contact pressure between the plate cylinder 3 and the anilox

roll 41 is lowered.

Moreover, when the anilox roll 41 is moved toward the

plate cylinder sleeve 7 by the position adjusting parts 48,

the contact pressure between the plate cylinder 3 and the

anilox roll 41 is raised.

The driven gear 19 of the anilox roll 41 is meshed with

the drive gear 18 of the plate cylinder 3 with an appropriate

backlash while the contact pressure between the plate cylinder

3 and the anilox roll 41 is adjusted.

[0043]

The turning body 50 holds one of the pair of supporting

shafts and is turned together with one supporting shaft.

In the printing apparatus 1 of the present embodiment,

one supporting shaft is the first supporting shaft 5, and the

other supporting shaft is the second supporting shaft 6.

Accordingly, the turning body 50 holds the first

supporting shaft 5 and is turned together with the first

supporting shaft 5.

Whereas, the second supporting shaft 6 is held by the

main body frame 20, and a position of the second supporting

shaft 6 is fixed within the printing apparatus 1.

The first supporting shaft 5 is moved by turning while

being in parallel with the second supporting shaft 6.

Moreover, the first supporting shaft 5 is rotatably

supported by the turning body 50 and is turned around a center of turning 51 integrally with the turning body 50.

The first supporting shaft 5 is moved toward or away from

the second supporting shaft 6 in accordance with a turning of

the turning body 50.

[0044]

The turning body 50 includes a pair of turning parts 52,

53 (a first turning part 52, a second turning part 53),

connecting parts 54, 55 (a first connecting part 54, a second

connecting part 55) turnably connecting the pair of turning

parts 52, 53 to the main body frame 20, one opening for exchange

(a third opening for exchange 56) formed in the first turning

part 52, and a housing 57 arranged in the third opening for

exchange 56.

The pair of turning parts 52, 53 is located on outside

the main body frame 20 and is arranged along the frame parts

21, 22 of the main body frame 20, respectively.

Turning parts 52, 53 are, for example, turning arms formed

in an arm shape and are connected to the frame parts 21, 22 by

the connecting parts 54, 55.

The center of turning 51 of the turning body 50 (see

Fig.3) is located at centers of the connecting parts 54, 55,

and is located on a straight line parallel with the axial

direction of the first supporting shaft 5.

[0045]

The third opening for exchange 56 is an opening for

exchange of the plate cylinder sleeve 7 and the impression

cylinder sleeve 8, and is formed in the first turning part 52

corresponding to a position of the first supporting shaft 5.

A size of the third opening for exchange 56 is larger

than diameters of the plate cylinder sleeve 7 and the

impression cylinder sleeve 8, and the plate cylinder sleeve 7

and the impression cylinder sleeve 8 may pass through the third

opening for exchange 56.

The housing 57 is arranged in the third opening for

exchange 56 of the first turning part 52, and is detachably

attached in the third opening for exchange 56.

At that time, the housing 57 is inserted into the third

opening for exchange 56 from the outside of the turning body

, and is attached in the third opening for exchange 56.

The third opening for exchange 56 is closed by attaching

the housing 57 in the third opening for exchange 56.

Moreover, the housing 57 is drawn out of the third opening

for exchange 56 to the outside of the turning body 50 and is

detached from the third opening for exchange 56.

The third opening for exchange 56 is opened by detaching

the housing 57 from the third opening for exchange 56.

[0046]

The first supporting shaft 5 includes a first supporting

part 5E located on one end 5B side and a second supporting

part 5F located on the other end 5C side.

The housing 57 is a supporting member for supporting the

first supporting part 5E of the first supporting shaft 5 and

is connected to the first supporting part 5E of the first

supporting shaft 5, when attached in the third opening for

exchange 56.

The turning body 50 rotatably supports the first supporting part 5E of the first supporting shaft 5 by the housing 57 of the first turning part 52, and rotatably supports the second supporting part 5F of the first supporting shaft 5 by the second turning part 53.

[0047]

The third opening for exchange 56 of the turning body 50

is arranged in alignment with the first opening for exchange

23 of the main body frame 20.

When the housing 57 is detached from the third opening

for exchange 56, support by the first supporting part 5E of

the first supporting shaft 5 is released, and the first

supporting shaft 5 is supported only by the second supporting

part 5F.

Under the condition, the plate cylinder sleeve 7 or the

impression cylinder sleeve 8 can be drawn out of the main body

frame 20 through the first opening for exchange 23 and the

third opening for exchange 56, and the plate cylinder sleeve

7 or the impression cylinder sleeve 8 can be detached from the

first supporting shaft 5.

Moreover, the impression cylinder sleeve 8 or the plate

cylinder sleeve 7 can be inserted into the main body frame 20

through the third opening for exchange 56 and the first opening

for exchange 23, and the impression cylinder sleeve 8 or the

plate cylinder sleeve 7 can be attached to the first supporting

shaft 5.

Accordingly, on the first supporting shaft 5, the plate

cylinder sleeve 7 is exchanged with the impression cylinder

sleeve 8, or the impression cylinder sleeve 8 is exchanged with the plate cylinder sleeve 7.

[0048]

When printing on the rear face of the web 2 (see Figs.3,

), the plate cylinder sleeve 7 is attached to the first

supporting shaft 5.

Therefore, the turning body 50 is turned together with

the plate cylinder 3 while holding the plate cylinder 3.

Moreover, when the ink supply device 40 has been moved

in alignment with the position of the plate cylinder sleeve 7

attached to the first supporting shaft 5 (one supporting

shaft), the center of rotation 43 of the anilox roll 41 is

matched with the center of turning 51 of the turning body 50.

Under the condition, the driven gear 19 of the anilox

roll 41 is meshed with the drive gear 18 of the plate cylinder

3 with an appropriate backlash.

And the anilox roll 41 is in contact with the plate

cylinder sleeve 7 of the plate cylinder 3 with an appropriate

contact pressure.

In other words, the center of rotation 43 of the anilox

roll 41 is matched with the center of turning 51 of the turning

body 50, under the condition that the anilox roll 41 of the

ink supply device 40 is arranged at a position to supply ink

to the plate cylinder sleeve 7.

[0049]

The center of turning 51 of the turning body 50 is located

on a radially outer side of an outer peripheral surface of the

plate cylinder sleeve 7.

Moreover, the center of rotation 43 of the anilox roll 41 and the center of turning 51 of the turning body 50 are located on the same straight line parallel with the axial direction of the first supporting shaft 5.

Under the condition, the turning body 50 is turned by the

turning device 60 and moves the first supporting shaft 5 and

the plate cylinder 3 in a turning direction.

The turning device 60 turns the pair of turning parts 52,

53 of the turning body 50 at the same time and integrally turns

the pair of turning parts 52, 53 and the first supporting shaft

5.

[00501

Fig.10 is a schematic view of the turning body 50 shown

in Fig.5 in a turned state.

Fig.11 is a sectional view of the turning body 50 and the

turning device 60 attached to the main body frame 20.

As shown in Figs.5, 10, 11, the turning device 60 includes

a pair of turning mechanisms 61A, 61B (a first turning

mechanism 61A, a second turning mechanism 61B) provided on the

pair of frame parts 21, 22 of the main body frame 20.

The first turning mechanism 61A turns the first turning

part 52 of the turning body 50, and the second turning

mechanism 61B turns the second turning part 53 of the turning

body 50.

[0051]

Each of turning mechanisms 61A, 61B includes a control

member 62 controlling the turning of the turning parts 52, 53

and a driving part 63 driving the control member 62.

The driving part 63 is a piston-cylinder mechanism and is connected to the frame part 21 or 22 and the control member

62.

The control member 62 includes a shaft member 64 which is

rotatably supported by the frame part 21 or 22, a lever 65

fixed to one end of the shaft member 64, and a rotating member

66 fixed to the other end of the shaft member 64.

The driving part 63 and the lever 65 are arranged inside

the main body frame 20, and the rotating member 66 is arranged

outside the main body frame 20.

[0052]

The driving part 63 is rotatably connected to the lever

and rotates the lever 65 around a center of rotation 64A of

the shaft member 64 (see Fig.11).

The lever 65 is a rotating arm formed in an arm shape and

rotates the shaft member 64 and the rotating member 66 in

accordance with rotation.

The rotating member 66 is a tubular member incorporating

a cylindrical roller bearing and is rotated around a center (a

center of rotation 66A) in a radial direction of the rotating

member 66.

The center of rotation 66A of the rotating member 66 is

eccentric relative to the center of rotation 64A of the shaft

member 64.

Under the condition that an outer peripheral part of the

rotating member 66 is in contact with contact surfaces 52A,

53A of the turning parts 52, 53, the rotating member 66 is

rotated integrally with the shaft member 64 while being rotated

around the center of rotation 66A.

The contact surfaces 52A, 53A of the turning parts 52, 53

are parts of lower edge parts of the turning parts 52, 53.

[00531

Rotating members 66 are located on lower sides of the

contact surfaces 52A, 53A of the turning parts 52, 53 and

support the turning parts 52, 53 at the contact surfaces 52A,

53A.

Moreover, under the condition that the center of rotation

66A of the rotating member 66 is eccentric relative to the

center of rotation 64A of the shaft member 64, the rotating

member 66 in contact with the contact surface 52A or 53A is

rotated around the center of rotation 64A of the shaft member

64 while being rotated around the center of rotation 66A of

the rotating member 66.

The center of rotation 66A of the rotating member 66 is

moved around the center of rotation 64A of the shaft member 64

in accordance with a rotation of the shaft member 64.

At the same time, parts of the rotating members 66 in

contact with the contact surfaces 52A, 53A are shifted in a

peripheral direction of the rotating members 66.

Accordingly, positions of the contact surfaces 52A, 53A

of the turning parts 52, 53 are shifted, and the turning parts

52, 53 are turned.

The turning mechanisms 61A, 61B rotate control members 62

including the rotating members 66 by driving parts 63, and

turn the turning parts 52, 53 by the control members 62.

Further, positions of the contact surfaces 52A, 53A in

contact with the rotating members 66 are shifted in accordance with eccentric rotations of the rotating members 66 around centers of rotation 64A of the shaft members 64.

At that time, since the rotating members 66 are rotated

around centers of rotation 66A, a friction wear due to friction

of the contact surfaces 52A, 53A is suppressed.

[0054]

The turning device 60 turns the pair of turning parts 52,

53 and the turning body 50 together with the first supporting

shaft 5 by the pair of turning mechanisms 61A, 61B.

Moreover, the turning device 60 moves the first supporting

shaft 5 by the turning of the turning body 50 while the axial

directions of the pair of supporting shafts 5, 6 are in

parallel.

Accordingly, the first supporting shaft 5 is moved toward

or away from the second supporting shaft 6.

In accordance with a movement of the first supporting

shaft 5, the plate cylinder 3 is moved relative to the

impression cylinder 4.

Specifically, when the first supporting shaft 5 is moved

away from the second supporting shaft 6, the plate cylinder 3

(the plate cylinder sleeve 7) is separated from the impression

cylinder 4 (the impression cylinder sleeve 8) (see Fig.10), or

when the first supporting shaft 5 is moved toward the second

supporting shaft 6, the plate cylinder 3 is brought into

contact with the impression cylinder 4 (see Fig.5).

[00551

The contact surfaces 52A, 53A of the turning parts 52, 53

are contact surfaces of the turning body 50 in contact with the turning device 60 and are located on one side (here, downstream side) in the moving direction F of the web 2 with respect to the first supporting shaft 5.

Whereas, the center of turning 51 of the turning body 50

and connecting parts 54, 55 are located on the other side

(here, upstream side) in the moving direction F of the web 2

with respect to the first supporting shaft 5.

The turning device 60 turns the turning body 50 by

contacting with a contact surface of the turning body 50

through the control member 62.

The plate cylinder 3 is moved toward or away from the

impression cylinder 4 in accordance with the turning of the

turning body 50.

[00561

The plate cylinder sleeve 7 of the plate cylinder 3 is

pressed against the impression cylinder sleeve 8 of the

impression cylinder 4 by the turning of the turning body 50

(see Figs.5, 11).

Under the condition, the print pressure applied to the

web 2 passing through between the plate cylinder 3 and the

impression cylinder 4 is adjusted by a print pressure adjusting

mechanism 70.

The print pressure adjusting mechanism 70 includes a

displacement member 71 for displacing the turning body 50

around the center of turning 51 and an operation mechanism 80

for operating the displacement member 71.

The displacement member 71 includes a shaft part 72, two

eccentric parts 73, 74 (a first eccentric part 73, a second eccentric part 74) provided at both ends of the shaft part 72, and a projected part 75 projected from the first eccentric part 73.

[0057]

The shaft part 72 is bridged across the pair of frame

parts 21, 22 of the main body frame 20, and is rotatably

supported by the pair of frame parts 21, 22.

The eccentric parts 73, 74, the projected part 75 and the

operation mechanism 80 are arranged outside the main body frame

20.

The projected part 75 is projected from the first

eccentric part 73 to an opposite side of the shaft part 72 and

is formed concentrically with the shaft part 72.

The operation mechanism 80 is attached to the first frame

part 21 of the main body frame 20, and is connected to the

projected part 75 of the displacement member 71.

[00581

Fig.12 is a view of the print pressure adjusting mechanism

viewed in an arrow X3 direction illustrated in Fig.11.

As shown in the drawing, the operation mechanism 80 of

the print pressure adjusting mechanism 70 includes brackets 81

attached to the first frame part 21, an operation shaft 82

rotatably supported by the brackets 81, a worm 83 fixed to the

operation shaft 82, a worm wheel 84 fixed to the projected

part 75 of the displacement member 71 and a handle 85 attached

to the operation shaft 82.

The worm 83 and the worm wheel 84 are meshed with each

other.

The operation shaft 82 and the worm 83 are rotated by

rotating the handle 85.

The worm wheel 84 is rotated integrally with the

displacement member 71 in accordance with a rotation of the

worm 83.

[00591

A rotation of the displacement member 71 is operated by

the operation mechanism 80 (see Figs.11, 12), whereby the

displacement member 71 is rotated around a center of rotation

72A of the shaft part 72.

The eccentric parts 73, 74 are round-shaped cam parts,

and centers 73A, 74A in radial directions of the eccentric

parts 73, 74 are eccentric relative to the center of rotation

72A of the shaft part 72.

Distances between the centers 73A, 74A of the eccentric

parts 73, 74 and the center of rotation 72A of the shaft part

72 are amounts of eccentricity of the eccentric parts 73, 74

relative to the shaft part 72.

Amounts of eccentricity of the two eccentric parts 73, 74

are equal.

The eccentric parts 73, 74 of the displacement member 71

are rotated by the operation mechanism 80, while outer

peripheral parts of the eccentric parts 73, 74 are in contact

with receiving parts 52B, 53B of the turning parts 52, 53 (see

Figs.5, 11).

The receiving parts 52B, 53B of the turning parts 52, 53

are parts of upper edge parts of the turning parts 52, 53, and

are located on upper sides with respect to the contact surfaces

52A, 53A of the turning parts 52, 53.

The receiving parts 52B, 53B are located on lower sides

of the eccentric parts 73, 74 and receive the eccentric parts

73, 74.

[00601

The receiving parts 52B, 53B of the turning parts 52, 53

are pressed against the eccentric parts 73, 74 of the

displacement member 71 by the turning device 60.

Under the condition, the eccentric parts 73, 74 are

rotated around the center of rotation 72A of the shaft part 72

by rotational operation of the operation mechanism 80 while

keeping an eccentricity relative to the shaft part 72.

The centers 73A, 74A of the eccentric parts 73,74 are

moved around the center of rotation 72A of the shaft part 72

in accordance with eccentric rotations of the eccentric parts

73, 74.

At the same time, parts of the eccentric parts 73, 74 in

contact with the receiving parts 52B, 53B are shifted in

peripheral directions of the eccentric parts 73, 74.

Accordingly, positions of the receiving parts 52B, 53B of

the turning parts 52, 53 are shifted, then the turning parts

52, 53 and the turning body 50 are turned.

The displacement member 71 displaces the turning body 50

and the turning parts 52, 53 in the turning direction by the

eccentric parts 73, 74.

[0061]

The pressure adjusting mechanism 70 displaces the turning

body 50 together with the first supporting shaft 5 by the displacement member 71 while the axial direction of the pair of supporting shafts 5, 6 is in parallel.

Accordingly, the first supporting shaft 5 is displaced

toward or away from the second supporting shaft 6.

The plate cylinder 3 is displaced relative to the

impression cylinder 4 in accordance with the displacement of

the first supporting shaft 5.

The print pressure adjusting mechanism 70 adjusts the

print pressure applied to the web 2 by displacing the turning

body 50 and the first supporting shaft 5 thereby displacing

the plate cylinder 3 toward or away from the impression

cylinder 4.

Specifically, the print pressure applied to the web 2 is

lowered when the plate cylinder 3 is displaced away from the

impression cylinder 4 by the print pressure adjusting mechanism

70.

And the print pressure applied to the web 2 is raised

when the plate cylinder 3 is displaced toward the impression

cylinder 4 by the print pressure adjusting mechanism 70.

The web 2 passes through between the plate cylinder 3 and

the impression cylinder 4 while the print pressure applied to

the web 2 is adjusted.

[0062]

When printing on the rear face of the web 2 (see Figs.3,

4, 5), the plate cylinder sleeve 7 is attached to the first

supporting shaft 5, and the impression cylinder sleeve 8 is

attached to the second supporting shaft 6.

Moreover, the guide member 28 is attached in the second opening 27 of the main body frame 20.

The ink supply device 40 and the sub frame 30 are moved

in alignment with the position of the plate cylinder sleeve 7

and are attached in the first opening 26 of the main body frame

20.

Under the condition, the anilox roll 41 is brought into

contact with the plate cylinder sleeve 7 by the moving device

44, and the contact pressure between the plate cylinder 3 and

the anilox roll 41 is adjusted by the position adjusting part

48.

Along with this, the driven gear 19 of the anilox roll 41

is meshed with the drive gear 18 of the plate cylinder 3 with

an appropriate backlash.

Moreover, the anilox roll 41 is arranged at the position

to supply ink to the plate cylinder sleeve 7.

[00631

The turning body 50 and the plate cylinder 3 are turned

by the turning device 60 whereby the plate cylinder 3 is moved

relative to the impression cylinder 4.

Moreover, the turning body 50 and the plate cylinder 3

are displaced by the print pressure adjusting mechanism 70

whereby the print pressure applied to the web 2 is adjusted.

When the turning body 50 and the plate cylinder 3 are

turned (displaced), the center of rotation 43 of the anilox

roll 41 is matched with the center of turning 51 of the turning

body 50.

Accordingly, the plate cylinder 3 is moved around the

center of rotation 43 of the anilox roll 41 without changing the distance between a center of rotation of the plate cylinder

3 and the center of rotation 43 of the anilox roll 41.

[0064]

Accordingly, when the plate cylinder 3 is moved relative

to the impression cylinder 4, the contact pressure between the

plate cylinder 3 and the anilox roll 41 is not changed.

Further, when the print pressure applied to the web 2 is

adjusted, the contact pressure between the plate cylinder 3

and the anilox roll 41 is not changed.

In other words, the print pressure applied to the web 2

is adjusted while the contact pressure between the plate

cylinder 3 and the anilox roll 41 is constant.

The turning body 50 is arranged outside the main body

frame 20, and the anilox roll 41 is arranged inside the main

body frame 20.

In this way, in the printing apparatus 1, the turning

body 50 and the anilox roll 41 are differently arranged.

Therefore, a structure of the printing apparatus 1 is

prevented from being complicated, and the printing apparatus

1 is easily assembled.

The anilox roll 41 is easily arranged such that the

centers 43, 51 are matched with each other.

[00651

When printing on the front face of the web 2 (see Figs.6,

7, 8), the impression cylinder sleeve 8 is attached to the

first supporting shaft 5, and the plate cylinder sleeve 7 is

attached to the second supporting shaft 6.

The plate cylinder 3 is rotatably supported by the main body frame 20, and the impression cylinder 4 is rotatably supported by the turning body 50.

The turning body 50 holds the impression cylinder 4 and

is turned together with the impression cylinder 4.

Moreover, the guide member 28 is attached in the first

opening 26 of the main body frame 20.

The ink supply device 40 and the sub frame 30 are moved

in alignment with the position of the plate cylinder sleeve 7

and are attached in the second opening 27 of the main body

frame 20.

Under the condition, the anilox roll 41 is brought into

contact with the plate cylinder sleeve 7 by the moving device

44, and the contact pressure between the plate cylinder 3 and

the anilox roll 41 is adjusted by the position adjusting part

48.

Along with this, the driven gear 19 of the anilox roll 41

is meshed with the drive gear 18 of the plate cylinder 3 with

an appropriate backlash.

Moreover, the anilox roll 41 is arranged at the position

to supply ink to the plate cylinder sleeve 7.

[00661

The turning body 50 is turned by the turning device 60

and moves the first supporting shaft 5 and the impression

cylinder 4 in the turning direction.

The impression cylinder 4 is moved relative to the plate

cylinder 3 in accordance with the movement of the first

supporting shaft 5.

The impression cylinder 4 is moved toward or away from the plate cylinder 3 in accordance with the turning of the turning body 50.

Specifically, when the first supporting shaft 5 is moved

away from the second supporting shaft 6, the impression

cylinder 4 (the impression cylinder sleeve 8) is separated

from the plate cylinder 3 (the plate cylinder sleeve 7).

When the first supporting shaft 5 is moved toward the

second supporting shaft 6, the impression cylinder 4 is brought

into contact with the plate cylinder 3.

Moreover, the impression cylinder sleeve 8 of the

impression cylinder 4 is pressed against the plate cylinder

sleeve 7 of the plate cylinder 3 by the turning of the turning

body 50.

[0067]

The impression cylinder 4 is displaced relative to the

plate cylinder 3 by the print pressure adjusting mechanism 70.

The print pressure adjusting mechanism 70 adjusts the

print pressure applied to the web 2 by displacing the turning

body 50 and the first supporting shaft 5 thereby displacing

the impression cylinder 4 toward or away from the plate

cylinder 3.

Specifically, when the impression cylinder 4 is displaced

away from the plate cylinder 3 by the print pressure adjusting

mechanism 70, the print pressure applied to the web 2 is

lowered.

And when the impression cylinder 4 is displaced toward

the plate cylinder 3 by the print pressure adjusting mechanism

, the print pressure applied to the web 2 is raised.

[00681

The turning body 50 and the impression cylinder 4 are

turned by the turning device 60, whereby the impression

cylinder 4 is moved.

Moreover, the turning body 50 and the impression cylinder

4 are displaced by the print pressure adjusting mechanism 70

whereby the print pressure applied to the web 2 is adjusted.

When the turning body 50 and the impression cylinder 4

are turned (displaced), positions of the plate cylinder 3 and

the anilox roll 41 are not shifted, therefore, when the

impression cylinder 4 is moved, the contact pressure between

the plate cylinder 3 and the anilox roll 41 is not changed.

Moreover, when the print pressure applied to the web 2 is

adjusted, the contact pressure between the plate cylinder 3

and the anilox roll 41 is not changed.

Accordingly, the print pressure applied to the web 2 is

adjusted while the contact pressure between the plate cylinder

3 and the anilox roll 41 is constant.

[00691

As explained above, according to the printing apparatus

1, an adjustment of the print pressure and a movement of the

plate cylinder 3 relative to the impression cylinder 4 can be

easily performed by a simple mechanism while preventing a

change in the contact pressure between the plate cylinder 3

and the anilox roll 41.

When performing the adjustment of the print pressure and

the movement of the plate cylinder 3 relative to the impression

cylinder 4, it is not even required to adjust the contact pressure between the plate cylinder 3 and the anilox roll 41.

A load applied to the plate cylinder 3 from the anilox

roll 41 is prevented from changing.

As a result, the plate cylinder 3 (plate) can be

restrained from damaging.

[0070]

In the printing apparatus 1, the structure of the printing

apparatus 1 can be simplified while the number of components

can be reduced.

Therefore, a cost of the printing apparatus 1 can be

reduced.

Since the sub frame 30 is attached in the openings 26, 27

of the main body frame 20, the ink supply device 40 can be

easily arranged in alignment with the position of the plate

cylinder sleeve 7.

The sub frame 30 can be smoothly attached in the openings

26, 27 of the main body frame 20 by guiding of the guide member

28.

[0071]

The turning device 60 turns the turning body 50 around

the center of turning 51 while being in contact with the

contact surface of the turning body 50.

In the moving direction F of the web 2, the contact

surface of the turning body 50 is located on one side of the

first supporting shaft 5, and the center of turning 51 of the

turning body 50 is located on the other side of the first

supporting shaft 5.

Therefore, power required to turn the turning body 50 can be reduced and the turning body 50 can be easily turned by the turning device 60.

[0072]

Furthermore, in the printing apparatus 1 of the present

embodiment, the rear face 2A of the web 2 is a lower face of

the web 2, and the front face 2B of the web 2 is an upper face

of the web 2.

Whereas, the web 2 may be moved in the moving direction

F in an inverse state of the rear face 2A and the front face

2B of the web 2.

In this case, the rear face 2A of the web 2 is the upper

face of the web 2 and the front face 2B of the web 2 is the

lower face of the web 2.

Printing on the front face 2B of the web 2 is performed

when the plate cylinder 3 is located on the lower side of the

web 2.

And printing on the rear face 2A of the web 2 is performed

when the plate cylinder 3 is located on the upper side of the

web 2.

[0073]

The first supporting shaft 5 and the second supporting

shaft 6 may be replaced.

In this case, the turning body 50 holds the first

supporting shaft 5 located on the upper side of the web 2 and

turns the first supporting shaft 5.

The second supporting shaft 6 is located on the lower

side of the web 2 and is held by the main body frame 20.

[0074]

In the printing apparatus 1 of the present embodiment,

the moving direction F of the web 2 is horizontal.

Whereas, the moving direction F of the web 2 may be

different direction (e.g. vertical direction, obliquely upward

direction, obliquely downward direction).

The present invention is applicable to various printing

apparatuses in the same way as mentioned above regardless of

the moving direction F of the web 2.

Claims (4)

The claims defining the invention are as follows:

1. A printing apparatus capable of switching between front

face printing of a web and rear face printing of the web by

exchanging positions of a plate cylinder and an impression

cylinder relative to the web, comprising:

a pair of supporting shafts opposed with each other across

the web,

a plate cylinder sleeve and an impression cylinder sleeve

detachably attached to supporting shafts different from each

other, the supporting shafts to be attached being changeable,

an ink supply device including an anilox roll and being

movable in alignment with a position of the plate cylinder sleeve

attached to a supporting shaft, and

a turning body holding one of the pair of supporting shafts

and being turned together with one supporting shaft,

wherein a center of rotation of the anilox roll is matched

with a center of turning of the turning body, when the ink supply

device has been moved in alignment with the position of the

plate cylinder sleeve attached to the one supporting shaft.

2. A printing apparatus according to claim 1, further

comprising:

a main body frame including two openings provided on each

side of the pair of supporting shafts with respect to the web,

and

a sub frame moved integrally with the ink supply device in

alignment with the position of the plate cylinder sleeve and

attached in an opening on a supporting shaft side to which the

plate cylinder sleeve is attached.

3. A printing apparatus according to claim 2, further

comprising:

a guide member attached in the opening on the supporting

shaft side to which the impression cylinder sleeve is attached

and guiding the sub frame.

4. A printing apparatus according to claim 1 to 3, further

comprising:

a turning device turning the turning body by contacting

with a contact surface of the turning body, wherein,

the contact surface of the turning body is located on one

side in a moving direction of the web with respect to the one

supporting shaft, and

the center of turning of the turning body is located on the

other side in the moving direction of the web with respect to

the one supporting shaft.