JPS6251453A - Ink device - Google Patents

Abstract

PURPOSE:To make the thickness of an ink film uniform by providing a multilayer structure to an elastic ink application roller having a value of hardness increasing from the inner layer to the surface layer, to which roller a doctor blade is pressed. CONSTITUTION:The state of deformation caused by the pressing of an ink application roller 710 is represented by 'A' curve when a doctor blade 714 is not pressed and said roller 710 is at a standstill, 'B' curve when the doctor blade 714 is pressed onto said stationary roller to the extent of a prearranged value, and 'C' curve when the roller 710 is rotated with the doctor blade 714 kept in a pressed position. If the ink application roller 710 with a dual layer structure having outer layer 710d and a soft inner layer 710e is used, the roller becomes deformed across its entire length centering around the pressed part P of the doctor blade 714 when the doctor blade 714 is pressed. Thus it is possible to form an ink film with a uniform thickness in a roller axial direction (width direction).

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an inking device for applying ink on a plate wound around a printing cylinder of a printing press, and in particular to an inking device for applying ink on the surface of an inking roller in the width direction. An inking device that can form an ink film with a uniform thickness over the entire area. Regarding.

(Prior art and its problems) As an inking device used in a conventional offset printing press, for example, as shown in FIG. 20, an inking roller 50 is used.
An ink film 52 is formed on the ink forming roller 50 by pressing the cutting edge 51a of the doctor blade 51 against the surface of the ink forming roller 50 and adjusting the pushing amount of the blade cutting edge 51a while rotating the roller 50 in the direction of the arrow E. There are devices that allow you to adjust the thickness (in other words, the print density). In this type of inking device, a single-layer roller in which only one layer of rubber layer 54 is wound around a metal roller shaft 53 has been conventionally used as the ink forming roller 50, as shown in FIG.

However, the inking roller 5 having a single layer structure as described above
0, as shown in FIG. 20, the deformation of the roller 50 due to the pushing of the doctor blade 51 is concentrated near the blade pushing part, in other words, the roller 50 is greatly dented only near the blade pushing part, so that the ink is It becomes difficult to stably adjust the thickness of the film 52, and the roller axial direction (width direction)
There was a problem in that the thickness of the ink film was uneven along the direction.

(Purpose of the Invention) This invention was made to solve the above problem, and it is possible to form an ink film with a uniform thickness along the width direction on the surface of the ink form roller, making it possible to stably adjust the ink concentration. The purpose of this invention is to provide an inking device with the following characteristics.

(Means for achieving the object) In order to achieve the above object, the inking device of the present invention has the following features:
The elastic ink applicator roller against which the doctor blade is pressed has a multilayer structure in which the outer layer is harder than the inner layer.

(Example) The inking device of the present invention will be explained using the following printing press as an example.

A. Full view of the printing press Figure 1 shows a schematic cross-sectional view of a multicolor offset printing press that is capable of printing on continuous paper. As shown in the figure, a blanket cylinder 2 is disposed approximately in the center of the printing press body 1, and plates WA3. 4 are arranged respectively.

At the rear positions of these plate cylinders 3.4, there are corresponding plate cylinders 3.4
plate feeding and discharging units 5 and 6 that enable automatic plate feeding and discharging to the
Inking units 7.8 for applying ink to the plates wound around the corresponding plate cylinders 3, 4 are each removably attached, and each plate supply/discharge unit 5.6 has a plate supply/discharge tray 9.10. Can be detachably attached.

On the other hand, an impression cylinder 11 that can be freely attached to and taken off from the blanket cylinder 2 is disposed at a lower front position of the blanket cylinder 2, and a space between the impression cylinder 11 and the blanket cylinder 2 is provided at a lower rear position and a front position of the impression cylinder 11. A bin feed tractor 13 and a suction conveyor 14 for controlling the paper feed of the continuous paper 12 passed through the
are arranged respectively. These pin feed tractors 1
3 and the suction conveyor 14 are connected to the impression cylinder 11 and the blanket cylinder 2.
The continuous paper 12 is configured to be printed by controlling the paper feed of the continuous paper 12 intermittently in relation to the timing of the pick-up/detachment cylinder. Further, in the front position of the printing press main body 1, a folding unit 1117 is arranged which has a photographing guide 15 for storing printed continuous paper 12 in an alternately folded manner and a continuous paper tray 16 that can be raised and lowered. ing. Furthermore, an impression cylinder cleaning unit 29 is provided below the impression cylinder 11 to remove dirt from the surface of the impression cylinder.

Furthermore, a cleaning liquid supply unit 18 for supplying cleaning liquid to the blanket cylinder 2 and a wiping unit 19 for wiping off the cleaning liquid are removably attached to the upper front position of the blanket cylinder 2 during blanket cleaning. There is.

A main motor 20 is installed in the lower space of the printing press body 1, and the blanket W42 and the suction conveyor 14 are driven by the main motor 20 via, for example, a belt, and the blanket cylinder 2, plate cylinders 3, 4, and impression cylinder are driven by the main motor 20. 11 is mechanically interlocked with gears disposed to mesh with each other at one end of these winter use ends, forming a drive system using a main motor 20. Drive devices or actuators such as pulse motors and solenoids are attached to the remaining mechanical parts as necessary, and sensors and switches are installed at designated and necessary locations as information input means for controlling the drive timing of these drive systems. It is installed.

FIG. 2 shows an outline of the control system used in this printing press.
is connected to. The system program is stored in an external storage device 24, such as a 70 disk, and is given to the microprocessor 21 at the beginning of system startup. The operator gives commands through the operation panel 25 installed on the side of the printing press, and the microprocessor 21 takes in the necessary information from sensors and switches 26 and 27 and controls the motors, solenoids, etc. according to the system program. The drive system 28 of is operated appropriately.

The configuration, operation, etc. related to inking will be explained below.

B. Inking relationship (a) Configuration (1) Configuration of inking unit The inking unit 7 is shown in FIG. In the same figure,
Figure (a) is a front view of the inking unit, Figure (b) is a top view, Figure (C) is a right side view, Figure (d) is a sectional view, Figure (e) is a left side view, Figure (f) shows a plan sectional view thereof.

This inking unit 7 has left and right frames 701.7.
02 (Figures (a) and (b)) opposite side plates 701
Connecting shafts 703 and 704 between a and 702C (same figure (d))
The framework is constructed by passing the numbers. left and right frame 701,
702 has rail pieces 701b, 702b protruding outwardly from the upper ends of the side plates 701a, 702a, and locking pieces 701c, 702c protruding outwardly from the front ends of the side plates 701a, 702a. is installed protrudingly. Also,
At the upper part of the rear end of the side plates 701a and 702a, there are notches 701d and 70 cut diagonally toward the lower part and forward in order to engage an inking unit take-off cylinder drive lever (described later).
2d ((d) and (e) in the same figure), and the side plate 7
The lower rear ends of the plates 01a and 702a are finished into arcuate portions 701e and 702e corresponding to the outer diameter of the plate cylinder 3. Locking piece 7
01C.

A handle 705 and unit mounting screws 706a and 706b are respectively attached to the front side of 702C, and the locking piece 70
Connector 7 is connected to the back side of 2C via mounting bracket 707.
08 is installed. Further, a pulse motor 709 for controlling the pushing amount of the doctor blade is attached to the outer surface of the side plate 702a, and this pulse motor 709 is connected to the connector 708 via a cord (not shown).

As shown in FIG. 3(d), between the left and right frames 701, 702, there are a rubber ink forming roller 710, metal kneading rollers 711, 712. Rubber auxiliary ink application O-rough 13. Doctor blade 714 and eccentric roller 715
will be arranged.

The ink forming row 5710 has both ends of its roller shaft 710a rotatably supported by bearings 716 attached to predetermined positions on the side plates 701a and 702a, and an inking gear 717 and an ink forming row 5710 are attached to the right end of the roller shaft 710a. A roller reversal prevention mechanism 718 is provided, and a right end extension 710b and a left end extension 710 of the roller shaft 710a are provided.
A bearing 719 for regulating the distance between the shafts is attached to C. This ink forming roller 710 has an outer layer 710d (see FIG. 3(d)) made of hard rubber (and an inner layer Fi!!710e made of soft rubber) so that the deformation of the roller that occurs when the doctor blade 714 is pressed does not concentrate locally. Finished with a two-layer roller.

FIGS. 4(a) and 4(b) show detailed views of the ink form roller reversal prevention mechanism 718. As shown in the figure, an inking gear 717 is rotatably attached to the roller shaft 710a, and a pawl mold 720 is connected to the roller shaft 710a in a non-rotating manner. The outer surface of the inking gear 717 has a claw type 7.
Three fulcrum bins 722 are erected so as to surround the fulcrum bin 722, and an arm 723 whose distal end is a locking latch pawl 723a is rotatably connected to each fulcrum bin 722. At the tip of the arm 723, a spring bearing member 724 is erected by a fixed pin 724a, and the spring bearing of the adjacent arm 723 has a tension coil spring 7 between the members 724.
26 are respectively attached, thereby each arm 72
3 is urged to rotate inward about the fulcrum pin 722, and the claw portion 723a of the arm 723 is engaged with the claw mold 720.

This reversal prevention mechanism 718 prevents the inking gear 717 from rotating in the counterclockwise direction (positive direction) in FIG. The claw portion 723a of the arm 723 is shaped like a claw 720.
The rotation of the inking gear 717 is transmitted to the roller shaft 710a, and the inking roller 710 is rotated in the forward direction. On the other hand, when the inking gear 717 is rotated clockwise in FIG. 4(a) by an external manual operation when printing is canceled, the claw portion 7 of the arm
23a and the pawl type 720, in other words, the inking gear 717 is made to rotate idly relative to the windmill 720, and the rotation of the inking gear 717 is prevented from being transmitted to the O-ra shaft 710a. 710 is kept in a stopped state. That is, the reverse rotation prevention mechanism 718 functions to transmit the rotation of the inking gear 717 to the ink forming roller 710 during printing, and functions to prevent the ink forming roller 710 from reversing when printing is canceled. Fulfill.

Returning to FIG. 3 again, the kneading roller 711 has bearings 727 (FIG. 3 (C)) attached to both ends of the roller shaft 711a to the side plates 701a and 702a.

(f)) is supported to be rotatable and swingable in the roller axis direction.Similarly, the other kneading rollers 712 also have both ends of their roller shafts 712a connected to the side plates 701a, 70'2a.
It is rotatably supported by a bearing 728 attached to the roller and swingable in the axial direction of the roller.

The kneading rollers 711 and 712 are oscillated in the roller axial direction in conjunction with the rotation of the ink forming roller 710. The mechanism is as follows. That is, the third
As shown in Figures (e) and (f), the kneading roller 711.7
Grooved cams 729 and 730 are attached to the left end of 12, respectively. On the other hand, the roller shaft 7 of the ink form roller 710
A gear 731 is attached to the left end of 10a, and this gear 73
A cam 733 having a gear 732 meshing with the side plate 7
It is rotatably held using a fulcrum pin 734' protruding from 01a as a fulcrum. The cam 733 has a circumferential groove 733a formed on its outer circumference that is inclined with respect to the cam axis direction. Then, the circumferential groove 733a of the cam 733 and the cam 729.730
circumferential groove 729a.

730a, a cam follower 734. -735 are attached so as to cross each other, and the center portions of these cam followers 734 and 735 are rotatably supported by bearings 736 and 737 supported by the side plate 701a, respectively.

According to this swing mechanism, when the ink forming roller 710 is rotationally driven, the cam 733 is rotated through the gears 731 and 732.
rotates, and as the cam 733 rotates, the circumferential groove 733a
Due to the action of cam followers 734.735, bearings 736.
The cams 729 and 730 are oscillated about the fulcrum 737 to oscillate the cams 729 and 730 in the axial direction of the rollers.
is driven to swing in the axial direction of the roller.

On the other hand, bearings 727 and 728 (Fig. 3(c) and (f)) for supporting the kneading rollers 711 and 712 are rotatably mounted on the side plate 7 with bolts 738 and 739 as fulcrums, respectively.
01a, 702a, these bearings 727, 7
28 are connected to the actuation lever 742 via links 740, 741, respectively. This operating lever 742 is
It is rotatably attached to the side plates 701a and 702a using the fulcrum bin 743 as a fulcrum, and its upper end is connected to the rail piece 70.
1b, 702b (3rd (
b) A rail piece 701b penetrates through ) from below.

It protrudes above 702b, and a spring locking recess 742a is formed at the upper end of the protrusion.

When this spring locking recess 742a is pushed to the left in FIG. 3(C), the operating lever 742 falls to the left about the fulcrum pin 743, and the bearing 727 rotates counterclockwise via the link 740 about the bolt 738. The kneading roller 7
The peripheral body of No. 11 is the circumferential body of the ink form roller 710,
It is pressed against the circumference of the auxiliary ink applicator roller 713. At the same time, the bearing 728 is connected to the bolt 7 via the link 741.
The kneading roller 71 is rotated clockwise around 39 as a fulcrum.
The circumferential body portion of No. 2 is pressed against the circumferential body portion of the inking roller 710. During printing, in the above pressing state, the mixing rollers 711 and 712 rotate while swinging in the roller axial direction as the ink forming roller 710 rotates, thereby making the ink film thickness on the ink forming roller 710 uniform. perform an action. When the spring locking recess 742a is released from the pressed state in the above-described pressed state, the kneading rollers 711 and 712 are pushed back to their original positions by the elastic force of the rubber of the inking roller 710.
The pressing force of the kneading rollers 711, 712 against the inking roller 710 is released.

The auxiliary ink application roller 713 has its roller shaft 713a.
(Fig. 3(C), (e)).
It is rotatably supported by a bearing 745 attached to a predetermined position of 702a. This auxiliary ink application roller 713
has a circumferential body portion facing the circumferential body portion of the mixing roller 711, and is configured to transfer the ink on the ink applicator roller 710 to the auxiliary ink applicator roller 713 via the mixing roller 711.

The doctor blade 714 has both ends attached to the frame side plates 701a, so that it can move forward and backward in the left and right directions in FIG. 3(d).
Pivot bearing 746 attached to 702a (Fig. 3(a)
), and this doctor blade 714
The space surrounded by the front surface of the ink forming roller 710 and the upper surface of the ink forming roller 710 is an ink reservoir space 747. A pair of support fittings 748 are attached to the connecting shaft 704, which is stretched between the frame side plates 7018 and 702a, at a predetermined interval in the left-right direction. held at intervals.

As shown in FIGS. 3(a) and 3(b), the eccentric roller 715 has a bearing structure in which an outer ring 715C is rotatably attached to the outer periphery of an inner ring 715a via balls 715b. The inner rings 715a are connected to each other by the connecting shaft 74.
Connected by 9.

In this case, the inner ring 715a, the outer ring 715c, and the connecting shaft 749
The centers of rotation of are arranged to coincide with each other. Further, a rotational drive shaft 750 is connected to the outer surface of the inner ring 715a of both eccentric rollers 715.

The axis of this rotary drive shaft 750 is eccentric with respect to the rotation centers of the eccentric roller 715 and the connecting shaft 749, and this rotary drive shaft 750 is connected to the bearing 7 provided on the support fitting 748.
51 so as to be rotatable.

This rotary drive shaft 750 is rotationally driven by a pulse motor 709 connected to the right end of the rotary shaft 750 via a shaft coupling 752.

The pulse motor 709 drives the rotational drive shaft 750 to the third position.
If it is rotated within a predetermined range in the counterclockwise direction of figure (d),
The inner ring 715a of the eccentric roller 715 similarly rotates eccentrically in the counterclockwise direction with respect to the rotation center of the rotary drive shaft 750, and with this eccentric rotation, the outer ring 715C of the eccentric roller 715 presses its outer peripheral surface against the back surface of the doctor blade 714. The center position of the doctor blade 714 is eccentrically moved while its rotation is restricted, and the doctor blade 714 is pushed to the left in FIG. 3(d). Conversely, if the rotary drive shaft 750 is rotationally driven in the clockwise direction in FIG. 3(d) within a predetermined range, the outer ring 715C of the eccentric roller 715 moves to the right in FIG. 3(d), contrary to the above. The doctor blade 714 is connected to the ink forming roller 7.
Due to the elastic force of the rubber No. 10, the back surface is pressed against the pushing member 715 and pushed back to the right in FIG. 3(d).

Therefore, the rotation drive shaft 750 is
By controlling the amount of rotation of the doctor blade 714, it is possible to adjust the pushing amount of the doctor blade 714 against the ink forming roller 710. In this embodiment, the pushing amount of the doctor blade 714 is controlled by electronic control (the details of which will be described later). It is configured to do so.

FIG. 5 is a sectional view and a front view of a main part of the inking unit 7, showing a mechanism necessary for controlling the amount of pushing of the doctor blade 714. As shown in the figure, the rotary drive shaft 7
50, a cam 753 for detecting the origin and a cam 7 for detecting the pushing limit.
A limit switch 755 for detecting the origin and a limit switch 756 for detecting the pushing limit, which are operated by these cams 753 and 754, are attached to the support fitting 748 via the fitting 757. These limit switches 755 and 756 are electrically connected to a connector 708 shown in FIG. 3(b).

(2) Structure of the mounting side of the inking unit Next, the structure of the mounting side of the inking unit 7 will be explained. FIG. 6 shows a rear view of the printing press main body 1 before the inking unit 7 is attached, and FIG. 7 shows a sectional view taken along the line ■--■ in FIG.

First, the plate cylinder gear 301 is fixed to the right end of the plate cylinder 3, and the plate 113 and the plate cylinder gear 301 are rotatably held on the plate cylinder support shaft 302. The plate cylinder support shaft 302 has an eighth
As shown in the figure, an eccentric shaft 303 having a rotation center 303a eccentric to the axis 302a of the plate cylinder support shaft 302 is provided.
It is rotatably held by bearings 304 attached to 01 and 102. This rotational drive of the plate cylinder 3 is performed by meshing the plate cylinder gear 301 with a blanket cylinder gear (not shown) provided at the right end of the blanket cylinder 2, and also by separating the plate cylinder 3 from the blanket cylinder 2. Wearing is performed by rotating the eccentric shaft 303 in forward and reverse directions within a certain angle using, for example, a pulse motor.

A pair of center distance regulating members 305 are arranged on both sides of the plate cylinder 3. The center distance regulating member 305 has a lower end rotatably held by the plate cylinder support shaft 302, and a bearing holding recess 305a for holding the center distance regulating bearing 719 of the inking unit 7 is formed in the upper end. Ru.

In addition, the center distance regulating member 305 has a positioning pin insertion hole 305b formed at a substantially intermediate position, and the positioning pin 103 protruding from the inner surfaces of the left and right side plates 101 and 102 is passed through the positioning pin insertion hole 305b. and is configured to maintain a constant posture. In this case, the hole diameter of the positioning bin insertion hole 305b is set to be larger than the shaft diameter of the positioning bin 103, so that the operation for detaching and detaching the plate cylinder 3 due to the eccentric rotation of the plate cylinder support shaft 302 is not hindered. There is.

On the other hand, on the inner surfaces of the left and right side plates 101 and 102, there are rail receiving pieces 1 that function as installation guides for the inking unit 7.
04.105 are installed in opposing positions. As shown in FIG. 9, a torsion coil spring 106 is attached to the upper surface of the rail receiving piece 105 with a screw 107, and the tip 106a of the spring engages with the operating lever 742 when the inking unit 7 is installed. placed in position.

A torsion coil spring 108 is similarly attached to the upper surface of the rail receiving piece 104. Also, rail receiving piece 1
A locking member 109 is attached to the front end of the upper surface of the 04.105, and the inking unit 7 is attached to the lower surface 109a of the notch.
rail piece 701b.

By engaging the upper surface of the rear end of 702b, the inking unit 7 can be held in the drawn state.

In addition, a pair of inking unit support arms 110 and 111 are attached to bolts 1 on the inner surfaces of the left and right side plates 101 and 102.
12 as a fulcrum, and the rotation range of these support arms 110 and 111 is the same as that of the left and right side plates 101 and 1.
By the rotation regulating member 113 protruding from the inner surface of 02,
It is regulated within a certain range that does not interfere with the detachment/detachment If111J operation of the inking unit 7. Also, bolt 112
In other words, the center of rotation of the support arms 110, 111 is at the pressure angle α (14. in this example) shown in FIG.
50'), and as a result, when the inking unit 7 is installed, the inking gear 717 is rotated by the rotational drive of the plate cylinder gear 301.
It is configured to be biased in the direction of engagement. A screw hole 114 corresponding to the unit mounting screws 706a, 706b of the inking unit 7 is formed in the front surface of these support arms 110, 111. The support arm 111 also has an inking unit 7 located above the screw hole 114.
A limit switch 115 is attached to detect the completion of attachment, and a connector 117 is attached via a fitting 116. This connector 117
It is connected to the microprocessor 21 via the controller 23 shown in the figure.

On the other hand, at a rear position of the rail receiving pieces 104 and 105, a pair of take-off cylinder drive levers 118 for performing the take-off operation of the inking unit 7 are arranged at a predetermined interval in the left-right direction. These takeoff cylinder drive levers 118 have bearings 118a that can be engaged with the notches 701d and 702d of the inking unit 7 at their tips, and their base ends are fixed to a drive shaft 119. , both ends of which are
It is rotatably held by bearings 120 attached to left and right side plates 101 and 102. At the right end of this drive shaft 119, a link 121 shown in FIG.
A spring 122 for urging the link 121 to rotate clockwise is passed between one end of the link 121 and the right side plate 102, and a spring 122 for rotationally driving the link 121 counterclockwise. The solenoid 123 is fixed to the right side plate 102, and the solenoid 123 and the link 1
The other end of 21 is connected by a spring 124.

Further, a stopper 125 for regulating the rotation range of the link 121 is attached to the right side plate 102.

When this solenoid 123 is energized, link 1
21 is rotationally driven in the counterclockwise direction in FIG. 10, and accordingly, the release lever 118 is also rotationally driven in the counterclockwise direction in FIG. Then, when the solenoid 123 is de-energized, the link 121 rotates back in the clockwise direction in FIG.
18 also rotates clockwise and returns to the position where the inking unit 7 is operated for detuning.

(b) Installation of the inking unit Next, the procedure for installing the inking unit 7 into the printing press body 1 will be explained. This mounting is performed with the multiple cylinders in the printing press main body 1 in a separated state. That is, the plate cylinder 3 is out of tune with the blanket cylinder 2, and the inking unit 7
The detachment/detachment lever 118 for driving the detachment/detachment cylinder is also in the detuning operating position (clockwise rotation position in FIG. 7).

To install the inking unit 7, hold the handle 7 with both hands.
05, lift the inking unit 7, and hook the rear ends of the rail pieces 701b and 702b of the inking unit 7 to the front ends of the rail holders and pieces 104 and 105 of the printing press main body 1, and then 702b to rail receiving piece 1
04. Slide the printer main body 1 along 105.
Push it deep inside. The inking unit 7 is the printing press main body 1
When the inking unit 7 is pushed all the way in, the bearing 118a of the take-off lever 118 engages with the notches 701d and 702d of the inking unit 7, and the rear end of the inking unit 7 moves slightly upward, as shown in FIG. The rail piece 701b is lifted thereby.

The rear end of 702b rises from the rail receiving pieces 104 and 105. Next, install the inking unit 7 mounting screw 706.
a, 706b, inking unit support arm 110
．． When the locking pieces 701C and 702c of the inking unit 7 are tightened into the screw holes 114 of the inking unit 7, the bolts 1
12 as a fulcrum and is lifted slightly upwards and drawn toward the support arm 110.
4. It rises from 105. In this way, the rail piece 70
By disposing 1b and 702b apart from each other above the rail receiving pieces 104 and 105, the next operation of wearing the inking unit 7 becomes possible.

When the inking unit 7 is installed in this way,
The limit switch 115 is turned on by being pushed by the locking piece 702C, and an inking unit attachment detection signal is output to the microprocessor 21 (FIG. 2). In addition, the connector 708 attached to the inking unit 7
Connected to a connector 117 attached to the support arm 111, the motor and switches of the inking unit 7 are electrically connected to the microprocessor 21 (FIG. 2). Further, the operating levers 742 provided on both sides of the inking unit 7 are pushed by the springs 106 and 108 provided on the rail receiving pieces 104 and 105, as shown in FIG. 11(a).
The kneading rows 5711 and 712 are pressed against the inking row 5710 with a predetermined pressure via the link mechanism described above. Further, the inking gear 717 meshes with the plate cylinder gear 301, and the inter-axis distance regulating bearing 719 is disposed facing above the bearing holding recess 305a of the inter-axis distance regulating member 305.

The inking unit 7 can be removed by following the procedure reverse to the installation procedure. When inking unit 7 is removed,
The connection between the connectors 708 and 117 is released, the limit switch 115 is turned off, and the actuation lever 74 is turned off.
2 returns to the upright position, and the pressing force of the kneading rollers 711, 712 to the inner layer application roller 710 is released.

The inking unit 8 has the same structure as the inking unit 7, and its installation and removal operations are performed in the same manner as the inking unit 7.

(C) Operation (A) Operation of the inking unit and the cylinder
It is necessary to separate the ink form roller 710 from the plate cylinder 3, and conversely, it is necessary to attach the inking roller 710 to the plate cylinder 3 during printing.

Such an operation for taking off and taking off the inking unit 7 is performed by controlling the rotation of the takeoff cylinder drive lever 118, which is engaged with the notches 701d and 702d of the inking unit 7, by a solenoid 123 shown in FIG. . That is, in order to wear the inking unit 7, the solenoid 123 is energized. This results in link 12
1 rotates in the direction around the 10th bacterium, the lever 118 similarly rotates in the counterclockwise direction in FIG.
The ink forming roller 710 and the auxiliary ink forming roller 713 are mounted on the plate (not shown) wound around the plate cylinder 3. In this case, the center distance regulating bearing 71 of the inking unit 7
9 is the bearing holding recess 3 of the center distance regulating member 305
05a, the distance between the roller shaft 710a of the ink form roller 710 and the plate cylinder support shaft 302 is maintained at a constant distance, thereby preventing the nip between the ink form roller 710 and the plate cylinder 3 during printing. The width is kept at a constant value that is optimal for ink transfer. In order to cause the inking unit 7 to perform a detuning operation, the energization to the solenoid 123 shown in FIG. 10 may be canceled.

When the solenoid 123 is de-energized, the lever 118 shown in FIG. 11 rotates clockwise, and the inking unit 7 is removed from the plate cylinder 3 by the reverse operation.

The inking unit 8 (FIG. 1) is moved to and from the plate cylinder 4 in the same manner as the inking unit 7.

(b) Regular printing operation of the inking unit Regular printing is
This is carried out with the inking unit 7 (the same applies to the inking unit 8) attached to the plate cylinder 3. During this steady printing, as shown in FIG. 12, since the plate cylinder 3 is driven to rotate counterclockwise, the plate cylinder gear 301 (first
The inking roller 710 rotates in the clockwise direction (positive direction) in FIG. 12 via the inking gear 717 meshed with FIG.
The rotation of the ink applicator roller 710 causes the kneading rollers 711 and 712 to rotate counterclockwise while swinging in the axial direction, and the auxiliary ink applicator roller 713
is rotated clockwise.

As a result, the area immediately after the passage of the doctor blade 714 on the surface of the circumferential body of the ink forming roller 710 is filled with the ink 758 stored in the ink reservoir space 747.
An ink film having a thickness corresponding to the pushing amount of the cutting edge 714a of the doctor blade 714 is formed, and after the thickness of this ink film is made uniform by a kneading roller 711 that swings in the axial direction, it is wound around the plate cylinder 3. Ink is applied to the drawing lines on the printed version.

The ink on the ink applicator roller 710 left after ink is
Again, the film thickness is made uniform by the kneading roller 712, and the ink is applied to the plate on the plate cylinder 3 again via the auxiliary inking roller 713. Note that the ink that has not been transferred to the mixing roller 712 is collected in the ink reservoir space 747 and reused for the next printing.

(C) Operation for controlling the amount of pushing of the doctor blade 714 Next, the operation for controlling the amount of pushing of the doctor blade 714 will be explained.

FIG. 13 is a diagram showing the pushing operation of the doctor blade 714 as the eccentric roller 715 rotates eccentrically. Same figure (
a) shows the state before the pushing operation. From this state, when the eccentric roller 715 eccentrically rotates counterclockwise, the eccentric roller 715 rotates eccentrically in the counterclockwise direction.
), the doctor blade 714 kisses the ink form roller 710, and as the amount of rotation increases, the amount of pushing into the ink form roller 710 gradually increases (see (C) in the same figure), ) is pushed to the predetermined pushing limit position. Further, as the eccentric rotation continues, the ink forming roller 71
The pushing amount to 0 reaches the maximum pushing amount.

The principle of the pushing operation has been explained above, but in the above embodiment, the microprocessor 21 (FIG. 2) is configured to perform the pushing operation within the range from (b) to (d) in the same figure. controlled. For this purpose, the rotational position shown in FIG. 4B is set to the origin position, and the rotational position shown in FIG. 1D is set to the pushing limit point. Then, the sensors for detecting the origin position U and the pushing limit point, that is, the origin detection limit switch 755 and the pushing limit detection limit switch 756, are placed in positions facing the rotary drive shaft 750, as shown in FIG. A cam 753 for detecting the origin and a cam 754 for detecting the push limit for operating the limit switches 755 and 756 are attached to the rotation drive shaft 75.
Attached to 0.

In this case, the origin detection limit switch 755 is
The limit switch 756 for detecting the pushing limit is turned on only within the rotation range shown in Fig. 3(a) to (b).
) to (e). FIG. 14 shows the limit switch 755.75.
FIG. 6 is a diagram showing the relationship between the operating state of No. 6 and the pushing state of the blade. In addition, as mentioned above, the rotational drive shaft 75
In other words, the rotation of the eccentric roller 715 is performed by a pulse motor 709 (FIG. 3(b)) controlled by the microprocessor 21 (FIG. 2).

FIG. 15 is a flowchart showing the pressing amount control operation performed by the microprocessor 21 (FIG. 2) when the inking unit 7 (the same applies to the inking unit 8) is installed.

When the inking unit 7 is installed, first step S
1, it is determined whether or not the origin detection limit switch 755 is "on". Now, hypothetically, eccentric roller 715
is at the rotational position within the range of FIGS. 13(a) to 13(b)(7). Since the origin detection limit switch 755 is "on" as shown in FIG. 14, step S2 Then, the pulse motor 709 is rotated in the pushing direction (around the 13th bacterium) by 10 pulses (in this embodiment, it is set to push in 0.05 am with 45 pulses). After that, step S1 again
In other words, the eccentric low 5715 returns to
The above operation is repeated until the rotational position exceeds the origin position (FIG. 13(b)).

In this way, if the rotational position of the eccentric roller 5715 exceeds the original position, or if the rotational position of the eccentric roller has exceeded the original position from the beginning, the process proceeds to step $3, where the pulse motor 709 pulls back by one pulse. direction 13th
(clockwise direction in the figure). As a result, the doctor blade 714 is pulled back by one pulse due to the elastic force of the rubber of the ink forming roller 710, and the process proceeds to step S4.

In step S4, it is determined again whether or not the origin detection limit switch 755 is turned on. If it is still "off," the process returns to step S3 and the origin detection limit switch 755 is turned on. In other words, the rotational position of the eccentric roller 715 reaches the origin position (
The above operation is repeated until reaching FIG. 13(b)).

In this way, when the eccentric roller 715 reaches the home position, the process proceeds to step S5, where the pushing operation is performed by the preset number of pulses by the pulse motor 709.
For example, as shown in FIG. 13(C), the doctor blade 714 is pushed into the standard pushed-in position. It goes without saying that this standard push-in position can be changed as appropriate by setting the specified number of pulses to an appropriate value.

16 and 17 show the inking unit 7.
If the desired print density cannot be obtained with the standard pushing position of the doctor blade 714 set by the installation of the
3 is a flowchart showing the operation of the microprocessor 21 performed in conjunction with the input operation of the "push key" or "pull back key" in FIG.

In other words, when the "push key" is pressed,
□In step S6, it is determined whether or not the push-in limit detection limit switch 756 is "on". Figures (d) to (e)
), it is necessary to prohibit further pushing, so proceed to step S7, sound the buzzer, and end the work.

On the other hand, if it is determined in step S6 that the pushing limit has not been exceeded, the process proceeds to step S8, where the pulse motor 709 performs a pushing operation by one pulse. Next, the process proceeds to step S9, where the pushing operation for 45 pulses (
It is determined whether or not the pushing amount (equivalent to a pushing amount of 0,051 m) has been performed, and if the pushing operation for 45 pulses has not been performed, the process returns to step S6 again and the steps are continued until the pushing operation for 45 pulses has been performed. Repeat the above steps. thus,
When the doctor blade 714 is pushed in by 0.05 mm by performing the pushing operation for 45 pulses, the work is completed.

In this way, the doctor blade 714 is pushed in by 0.05 HR with one key operation, so in order to obtain the desired pushing amount, it is only necessary to perform the key operation the corresponding number of times.

On the other hand, when the "pullback key" is pressed, step 8
10, the origin detection limit switch 755 is set to "
If it is "on", that is, if the rotational position of the eccentric roller 715 is at the origin position or beyond the origin position (states shown in FIGS. 13(b) to (a)), Since it is necessary to prohibit further pullback, step S1
Proceed to step 1, sound the buzzer, and finish the work. On the other hand, in step S10, the origin detection limit switch 7
55 is "off", the process advances to step S12, and the pulse motor 709 performs a pullback operation by one pulse. Next, the process proceeds to step S13, where it is determined whether or not the pullback operation for 45 pulses (corresponding to a pullback amount of 0.05 m) has been performed. If the pullback operation for 45 pulses has not been performed, Returning to step S10 again,
The above operation is repeated until the pullback operation for 45 pulses is performed. In this way, when the doctor blade 714 is pulled back by 0.05 m after performing the pull-back operation for 45 pulses, the operation is completed. In this pulling back operation, the doctor blade 714 is pulled back by 0.05 mm with one key operation, so in order to obtain the desired amount of pulling back, it is only necessary to perform the key operation the corresponding number of times. Here, the amount of blade that can be moved with one key operation is 0.051M1 (4
(equivalent to 5 pulses), but it is of course possible to change this value.

In this way, the rotation range of the eccentric roller 715 that is eccentric with respect to the rotation drive shaft 750 is controlled by the pulse motor 709 to adjust the pushing amount of the doctor blade 714 into the inking roller 710, so the structure is simple and simple. Through the operation, it is possible to finely adjust the pushing amount, in other words, it is possible to finely adjust the ink film thickness on the ink forming roller 710, and it is possible to control printing density with high precision.

Also, as the pushing amount increases, the ink forming row 5710
The eccentric roller 715
Since the phase is selected, even if the reaction force from the ink form roller 710 increases due to an increase in the pushing amount, there is no problem in rotating the eccentric roller 715 with the pulse motor. Moreover, since the rotation angle per pulse of the eccentric roller 715 is constant, if the eccentric roller 715 is used in a direction where the moment leg becomes shorter as described above, near the rotation angle at which printing density control is performed, It is possible to finely adjust the amount of push in response to changes in the rotation angle. Furthermore, as shown in FIG. 13(e), since there is a mechanical push-in limit position at a position slightly pushed in beyond the push-in limit detection, the rotary drive shaft 75
Even if the roller 0 operates abnormally, there is no need to worry about irreparably denting the ink forming roller 710.

(d) Effect of the two-layer structure of the ink forming roller As shown in FIG. 3(d), the ink forming roller 710 has an outer layer 710d
It has a two-layer structure in which the inner layer 710e is hard and the inner layer 710e is soft. FIG. 18 is a diagram showing a deformed state of the ink forming roller 710 due to pushing. However, in FIG. 18, the aspect ratio is changed to make it easier to understand the deformed state. In the figure, curve A indicates that the doctor blade 714 is not pressed and the ink form roller 71
0 indicates the roller shape when it is stationary, and curve B is
The doctor blade 7 is placed on the stationary ink applicator roller 710.
14 by a predetermined amount, and curve C shows the roller deformation when the inking roller 710 is rotated while the doctor blade 714 is kept at the pushed-in layer. As shown by curve C above,
When an ink forming roller 710 with a two-layer structure in which the surface layer is made of harder rubber than the inner layer is used as the ink forming roller, the doctor blade 71 is attached to the roller 710.
4, the deformation of the roller 710 extends to the inside of the roller, thereby further preventing local deformation as in the case of rollers. Therefore, it is possible to reduce unevenness in the thickness of the ink film formed on the surface of the ink form roller 710, and it is possible to form an ink film with a uniform thickness in the axial direction (width direction) of the roller.

FIG. 19 is a characteristic diagram showing, as an example, the relationship between the number of rotations of the ink forming roller, the amount of depression of the doctor blade, and the thickness of the ink film. What can be seen from this figure is that the ink film thickness is 10μ in the range of 0°2 to 0.5m of doctor blade depression.
It changes gradually from m to 5 μm, and is hardly affected by the number of rotations of the ink forming roller. In other words, by setting the doctor blade pushing amount within the above range, it becomes possible to form a stable and easily controllable ink film.

The material for the ink applicator roller 710 may be, for example, natural rubber, synthetic rubber, thermoplastic polymer elastomer, or the like. Now, to give a concrete example, the diameter is 60.
In the 5 m long inking roller 710, the roller shaft 7
10a has a diameter of 20 m, an inner layer 710e made of nitrile rubber with a thickness of 15IrgR1 and a rubber hardness of 20 degrees is fixed to the outer periphery of the roller shaft 710a, and a thickness 5. The outer layer 710d is made of nitrile rubber with a rubber hardness of 25s+ and a rubber hardness of 30 degrees.

In the above embodiment, the ink form roller 710 has a two-layer structure, but the ink form roller is not necessarily limited to a two-layer structure; in short, the closer the surface layer, the lower the inner layer. It is sufficient if it has a multilayer structure with a high hardness.

(e) Effect of the ink form roller reversal prevention mechanism The action of the reversal prevention mechanism 718 shown in FIG. Only rotation in the counterclockwise direction (positive direction in FIG. 4(a)) is transmitted to the ink form roller shaft 710a,
Rotation transmission in the clockwise direction (reverse direction) is blocked. Therefore, during printing, if the inking gear 717 is rotationally driven in the counterclockwise direction (forward direction) by the plate cylinder gear 301, it is possible to rotate the ink form roller 710 in the forward direction to perform a steady printing operation. can. On the other hand, when printing is stopped, if the plate cylinder 3 is manually rotated in the opposite direction to the rotation direction during printing due to operator error or for maintenance, inspection, etc., the plate cylinder gear 301 The king gear 717 is rotated clockwise (in the opposite direction), but in this case, the rotation of the inking gear 717 is not transmitted to the ink form roller shaft 710a, so the ink form roller 710 remains in a stopped state. (that is, the ink form roller 710 receives the pressing force of the doctor blade 714 and remains stopped),
Reverse rotation of 0 is prevented, and it is possible to prevent a large amount of ink from being transferred to the plate surface. Furthermore, during normal rotation, the gear mechanism rotates the inking roller 710 smoothly, allowing normal inking.

In the above embodiment, the one-way rotation transmission mechanism that transmits the rotation of the inking gear 717 in the forward direction to the inking roller shaft 710a and prevents the transmission of rotation in the reverse direction is connected to the mold wheel 720. Arm 723 with claw portion 723a
．． Although it is configured by a spring 726 and the like, it goes without saying that the one-way rotation transmission mechanism is not limited to the above configuration. Further, this ink form roller reversal prevention mechanism is applicable not only to a doctor blade type printing machine as in the above embodiment, but also to a reverse roller type printing machine.

(f) Effect of kneading roller pressing force applying/releasing mechanism Fig. 3 (
The action of the kneading roller pressing force applying/releasing mechanism shown in C) is as follows:
The above-mentioned “(1) Configuration of inking unit” and [(
b) Inking unit installation work]. That is, when the inking unit 7 is attached to the printing press main body 1, the operating levers 742 provided on both sides of the inking unit 7 are pushed by the springs 106 and 108 and fall down in the counterclockwise direction in FIG. 11(a). The kneading roller 711 is rotated as shown in FIG.
．． 712 is pressed against the in-1 forming roller 710 with a predetermined pressure. As a result, during printing, the thickness of the ink film on the ink forming roller 710 can be adjusted to
This can be made more uniform. On the other hand, when the inking unit 7 is removed from the printing press body 1 after printing is completed, the operating lever 74 is moved by the springs 106 and 108.
Since the pressing force of 2 is released, the ink application row 5710
The elastic force of the rubber pushes the mixing rollers 711, 712 back to their original positions, and the pushing angle force of the mixing rows 5711, 712 on the inking roller 710 is released. Thereby, even if the inking unit 7 is left in that state for a long period of time, permanent deformation of the inking roller 710 can be prevented.

As described above, according to this kneading roller pressing force applying/releasing mechanism, the kneading roller 711.
712 can be automatically brought into and out of pressure contact with the inking roller 710, in other words, the kneading roller 71
1. There is no need for any special work for pressure welding and pressure release of '712, and the work can be simplified.

In addition, in the above embodiment, the kneading rollers 711, 71
0- for pressing 2 against the ink forming roller 710.
The lever operating mechanism is connected to the operating lever 742 and the link 740.74.
Although the link mechanism is composed of a link mechanism such as ``1'', it is free to adopt a configuration other than the above-mentioned configuration as the roller operating mechanism. Further, although springs 106 and 108 are used as operating members for operating the roller operating mechanism, structures other than the springs 106 and 108 may be freely adopted.

(G) Effect of the center distance regulating member The effect of the center distance regulating member 305 shown in FIG. When the inking unit 7 is rotated toward the plate cylinder 3 side using the bolt 112 as a fulcrum by the lever 118, and the inking roller 710 and the auxiliary ink platter are attached to the plate cylinder 3, the inking unit 7 shaft is rotated. The distance regulating bearing 719 is locked in the bearing holding recess 305a of the center distance regulating member 305, and the distance between the roller shaft 710a of the ink form roller 710 and the plate cylinder support shaft 302 is kept constant. .Thus,
The contact pressure (in other words, the nip width) between the ink forming roller 710 and the auxiliary ink forming roller 713 and the plate cylinder 3 during printing can be maintained at a constant value that is optimal for ink transfer. (The function of the auxiliary ink forming roller 713 is the same as that of the ink forming roller 710, so below,
The ink forming roller 710 will be explained as a representative example. ) To explain in more detail, the distance regulating member 305 directly regulates the distance between the roller shaft 710a of the ink form roller 710 and the plate cylinder support shaft 302. Plate cylinder 3 and ink forming roller 71
The inking pressure between the ink forming roller 710 and the printing plate WA3 can always be kept constant without being affected by the timing of separating and applying the ink. For example, in order to efficiently control the ink concentration at the beginning of printing or at the end of printing, the plate rg43 may be moved to and from the blanket cylinder 2 with the ink form roller 710 attached to the plate cylinder 3. Alternatively, one ink forming roller 710 may be attached to the plate cylinder 3 set in the tube cylinder position relative to the blanket cylinder 2, or one ink forming roller 710 may be attached to the plate cylinder 3 set in the female position relative to the blanket cylinder 2. Ink form roller 710
Even when the ink forming roller 7 is separated from the cylinder, the center distance regulating member 305 prevents the ink forming roller 7 from moving, as in the case of regular printing.
10 and the plate JJi3 can be kept constant at all times, good ink transfer to the plate surface can be realized, and printing performance can be improved.

Note that the interaxial path tii regulating member 305 is not limited to the above configuration, and is not limited to the configuration described above.
Any structure may be used as long as it can keep the contact pressure constant.

(Effects of the Invention) As described above, according to the inking device of the present invention, the elastic ink forming roller against which the doctor blade is pressed has a multilayer structure in which the surface layer has a harder hardness than the inner layer. Because the roller is brushed, the deformation of the roller caused by the pressing of the blade spreads over the entire roller, centering on the pressing part.
This makes it possible to form an ink film with a uniform thickness in the axial direction (width direction) of the roller, making it possible to stably adjust the ink concentration.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a printing press that is an embodiment of the present invention, FIG. 2 is a schematic diagram showing a control system used in the printing press, FIG. 3 is a configuration diagram of an inking unit, and FIG. 4 is a block diagram of the ink form roller reversal prevention mechanism, Figure 5 is a block diagram of the main parts of the inking unit, Figure 6 is a partial rear view of the printing press main body before the inking unit is installed, and Figure 7 is the
Figure ■-■ line sectional view, Figure 8 is a diagram showing the mechanism in which the plate cylinder support shaft is eccentrically rotatably supported by the printing press body, and Figure 9 is the area centered on the rail receiver of the printing press body. A plan view showing
FIG. 10 is a diagram showing the drive mechanism of the inking unit MM cylinder drive lever, FIG. 11 is a diagram showing the installed state of the inking unit, FIG. 12 is a diagram explaining the steady printing operation of the inking unit, and FIG. The figure is a diagram explaining the pushing operation of the doctor blade, Figure 14 is a diagram showing the relationship between the operating states of the origin detection limit switch and the pushing limit detection limit switch and the blade pushing state, and Figure 15 is the inking unit. Flowcharts 1 to 16 are flowcharts showing the operation for controlling the amount of pushing of the doctor blade performed when the doctor blade is attached. The figure shows the operation to control the pushing amount of the doctor blade when a pullback command is given by the operator, Figure 18 shows the deformed state of the ink form roller due to blade pushing, and Figure 19 shows the ink form roller A characteristic diagram showing the relationship between rotational speed, blade pushing amount, and ink film thickness. Fig. 20 is an explanatory diagram of the operation of an inking device with a conventional single-layer structure inking port and -ra. Fig. 21 is a conventional single-layer structure. FIG. 3 is a cross-sectional view showing the ink forming roller of FIG. 7... Inking unit, 710... Ink forming roller, 710d... Outer layer, 710e... Inner layer, 714... Doctor blade

Claims (2)

[Claims] (1) In an inking device in which the thickness of an ink film formed on the surface of the roller is adjusted by adjusting the pushing amount of a doctor blade onto the surface of the elastic ink forming roller that is rotationally driven, the elastic ink forming roller An inking device characterized in that it has a multi-layer structure in which the surface layer has a harder hardness than the inner layer. (2) The inking device according to claim 1, wherein the elastic inking roller has a two-layer structure in which an inner layer is formed of a soft elastic material and an outer layer is formed of a hard elastic material.