JPH02194952A - Key-less inking method and its device - Google Patents

Abstract

PURPOSE:To miniaturize an inking device, to prolong the service life of a metering roller and to eliminate the need of maintenance by providing a non- rotary type press-in applying device or a pressure chamber independent of an ink removing device. CONSTITUTION:When a rotary press operates, the metering roller 1 rotates in the rotating direction 2, an ink supply means 4 pressure-supplies ink to the non-rotary type press-in applying device or the pressure chamber 3. In this state, when a position on the periphery 1A of the metering roller 1 comes to face the non-rotary type press-in applying device or the pressure chamber 3, the non-rotary type press-in applying device or the pressure chamber 3 press- applies the ink to the periphery 1A. When the metering roller 1 further rotates to bring the position on the periphery 1A into a position facing the ink removing device 5, the ink removing device 5 removes an excessive ink 6 exceeding an appropriate ink maintaining amount, out of the ink applied to the periphery 1A. Consequently, a uniform and constant amount of ink is maintained on the cells of the periphery 1A of the metering roller 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flexo rotary press used for printing newspapers and other materials;
Regarding keyless inking methods and devices for various types of rotary printing presses such as letterpress rotary presses and offset rotary presses, in particular miniaturization of inking devices, improved modifiability, maintenance-free construction, and longer life of metering rollers. 6. Prior Art Regarding a Keyless Inking Method and Apparatus that Allows for a Keyless Inking Method and Apparatus that is Excellent in Cost Reduction] As a prior art, first, an inking device for a keyless rotary press will be explained.

FIG. 14 is a sectional view showing a conventional key adjustment type inking device, and FIG. 15 is an explanatory diagram showing a key adjustment structure and a developed view of a printing plate in conjunction with the front view of the inking device in FIG. 14. be.

In the key adjustment type inking device, an ink cylinder 101 with a smooth circumferential surface is used as an ink source roller (Fig. 14).
indicates the direction of rotation.

An ink rail 103 is provided at a position facing the circumferential surface 101A of the ink cylinder 101.

The ink rail 103 has a structure in which an ink rail cap 105 is fixed on an ink rail main body 104, and is parallel to the axial direction of the ink cylinder 101 in a direction 4!
(Fig. 15).

The inner peripheral surfaces 104A and 105A of the ink rail main body 104 and the ink rail cap 105 have shapes corresponding to the shape of the peripheral surface 101A of the ink cylinder 101.

The ink rail 103 has its left and right ends connected to rails 107.
(Fig. 15), it is possible to adjust the movement in the direction 40 (Fig. 14) of moving toward and away from the ink cylinder 101, and after this adjustment, the position jη of the ink rail 103 can be adjusted by bolt 1.
It is a structure that can be identified by 09.

The ink rail cap +05 has many ink grooves 11.
5 are spaced apart from each other in the longitudinal direction 41 of the giant ink rail so as to open on the inner circumferential surface 105A of the ink rail cap. A large number of inks 774115 are
A portion A assumed on the printing plate 120 corresponding to the position of each ink groove 115 in the longitudinal direction 4I of the ink rail 103
, R, C1D, .

Since the ink groove 115 is large enough to supply a small amount of ink little by little toward the peripheral surface 101A of the ink cylinder 101, the cross-sectional area (Fig. 14) and opening area (Fig. 15) of the ink groove l15 are , both are small.

110 is an ink tank, 111 and 113 are ink tubes provided from the ink tank 110 to each ink groove 115, 112 is an ink plunger pump provided between each ink tube 111 and 113, and 116 is each ink plunger. The ink supply amount adjustment key (see FIG. 15 for the above) for adjusting the ink discharge amount of the pump 112, and the ink rail 114 (see FIGS. 14 and 15) are used to communicate the ink pipe 113 and the ink groove 115. Ink holes drilled in the main body 104 are shown.

A conventional key adjustment type inking device has the above structure. Next, the effect will be explained.

Make it before you start printing! ! The mouth is for each ink groove 1
Portions A and B of the printing plate 120 corresponding to 15.

By adjusting the large number of keys 116 while checking the total area of the printing area for each area A, D, etc., the discharge amount of each ink plunger pump 112 can be adjusted to
, B, C, D, etc., according to the distribution of the amount of ink required for printing.

In addition, the ink rail 103 is moved in the direction 40, and the ink rail 103 and the peripheral surface 101 of the ink cylinder 101 are
After adjusting to leave a certain small gap between A and A,
The position of the ink rail 103 is fixed.

In this state, if the rotary press is operated while supplying ink from the ink tank 110, the ink will flow from the numerous ink grooves 115 to the ink cylinder! Since the ink flows little by little toward the circumferential surface 101A of the OI, the ink is applied to the circumferential surface 101A of the ink cylinder 101.

When the circumferential surface 101A of the ink cylinder to which ink has been applied in this way passes a position corresponding to the inner circumferential surface 104A of the ink rail body, the flow of ink in the circumferential direction and axial direction of the ink cylinder is promoted. and printing plate 12
An ink film with a film thickness distribution matching the required ink amount distribution at 0 is formed. Thereafter, the circumferential surface 10IA of the ink cylinder 1O1 receives and passes ink to a subsequent roller of the inking device, for example, an ink forming roller, and then returns to a position facing the inner circumferential surface 104A of the ink rail 104 and ink again. Ink is supplied from the groove 115. Continuously cycle through these operations.

The inking device of such a key adjustment type rotary press has the following features:
It has the following drawbacks:

(1) In the key adjustment method, in order to adjust a large number of keys,
It takes a lot of manpower. As an example of the number of keys, for example, printing plate + 2
When printing the width of 4 newspapers at 0, if 8 ink grooves 1!5 are installed per newspaper, a total of 32 ink grooves 115 will be provided, so one key adjustment is required. It is necessary to operate 32 keys in sequence. The key adjustment work is performed while checking the distribution of ink usage on the printing plate on the paper, so the key adjustment requires the labor of a skilled person. Moreover, each time the printing plate changes, the keys must be readjusted. (2) The quality of printing by this key-adjustment type rotary press is not sufficient. The cause is <A> Ink rail 103
After supplying ink to the circumferential surface 101A of the ink cylinder 101 from the ink grooves 115 discontinuously provided in the longitudinal direction, the entire circumferential surface of the ink cylinder is covered using the flow of ink along the circumferential surface 101A of the ink cylinder. Because of this ink flow, the distribution of ink in the axial direction of the ink cylinder on the circumferential surface of the ink cylinder often deviates from the distribution of ink usage on the printing plate. Therefore, unevenness of ink distribution occurs on the printed paper surface, and the only way to adjust the ink supply and suction by adjusting the key is to adjust the distribution of the required amount of ink in the width direction of the printing plate, and not by adjusting the rotation of the printing plate. inability to respond to changes in the amount of ink required in the direction;
and so on.

(3) After the key adjustment is performed and printing is started, a large number of waste sheets occur at the beginning of printing until the ink supply to the printing plate reaches a steady state.

Key adjustment type rotary presses have the above-mentioned drawbacks, so in order to overcome these drawbacks, a metering roller is used instead of the ink cylinder described above, allowing printing without the need for adjusting the ink supply key. A keyless inking device has already been provided as a device that can uniformly supply ink to a plate surface.

Conventional keyless inking devices can be broadly divided into fountain roller type and pressure chamber type.
Next, I will explain them one by one.

The so-called fountain roller in keyless rotary presses
This type of inking device mainly consists of a metering roller, a fountain roller, and a doctor blade, and is applied to most letterpress keyless rotary presses and keyless offset rotary presses. An example of a fountain roller type inking device is shown in FIG.

In FIG. 16, 1 is a metering roller;
IA is the circumferential surface of the metering roller l, 2 is the rotation direction of the metering roller l, and the metering roller l is to uniformly hold a certain amount of ink on the circumferential surface IA over the entire circumferential surface IA. So that you can! It has a structure in which an extremely large number of fine cells are provided over the entire surface of A, and an example of the cell density is 17 and 300 lines per inch. Because of this structure, metering rollers are significantly more expensive than regular rollers.

Reference numeral 143 indicates a fountain roller extending parallel to the axial direction of the metering roller I over its entire length, 143A indicates the circumferential surface of the fountain roller 143, and 144 indicates the rotation direction of the fountain roller 143.

The lower part of the fountain roller 143 is immersed in the ink in the ink reservoir 142, and the vicinity of the hole of the peripheral surface 143A of the fountain roller 143 is in contact with the lower part of the peripheral surface IA of the metering roller 1. There is.

140 is an ink tank, and 141 is a pump that supplies ink from the ink tank 140 to the ink reservoir 142. The amount of ink supplied by the pump 141 is controlled by an ink supply amount adjusting device (not shown) so that the amount of ink in the ink reservoir 142 is constant.

+52 is a fountain roller eccentric position adjusting device for adjusting the state of contact of the fountain roller 143 with the metering roller I by changing the position of the fountain roller 143.

Reference numeral 145 denotes a doctor blade attached to the device 146. +53 is a doctor blade escape device consisting of a pneumatic cylinder, a lever, a link, and a stopper for letting the doctor blade +45 escape from the circumferential surface IA of the metering roller l during maintenance.

147 is a Baum finish roller, 148 is a home roller, 149 is a plate cylinder, 150 is a pressing cylinder, and 151 is a web for newspaper as a printing medium.

As an example of a conventional keyless inking device, a fountain roller type device has the structure shown in letter L. In addition, Figure 16 is Web! Although a mechanism for printing on one side of the web 51 is shown, a similar inking device can be applied to a mechanism for printing on the other side of the web +51. Next, the effect will be explained.

During printing, as the fountain roller 143 rotates with the rotation of the metering roller 1, a much larger amount of ink than is required for printing is delivered to the contact area between the metering roller ■ and the fountain roller 143. It is supplied to the circumferential surface IA of the metering roller 1 at.

The ink thus supplied is press-fitted into a large number of fine cells provided on the circumferential surface IA of the metering roller I by the contact rotation action of the metering roller 1 and the fountain roller 143. Since a large amount of ink is supersaturatedly supplied to the circumferential surface IA of the metering roller 1 at the contact position between the metering roller 1 and the fountain roller 143 as described above, 1-
After the press-fit coating is performed as described above, a large amount of surplus ink adheres to the circumferential surface IA of the metering roller l. This excess ink is removed by the doctor blade 145 as the metering roller 1 rotates. Therefore, each cell provided on the circumferential surface IA of the metering roller l after passing the position facing the doctor blade 145 holds a uniform, fixed amount of ink. This ink is applied to metering roller 1
The plate is passed from the circumferential surface IA to the printing plate 149A via the home finish roller 147 and the home roller 148, and is used for printing.

In this way, the thickness of the ink film transferred and formed on the home finishing roller 147 and the home roller 148 via the circumferential surface IA of the metering roller 1 is constant, and therefore the ink film thickness on the printing plate is also constant. Therefore, there is no need to adjust the ink supply key according to the plate surface, and by realizing keyless printing, we can expect to save on manpower, improve printing quality, reduce paper waste after printing, and ultimately reduce costs.

However, the fountain roller type keyless inking device has the following drawbacks.

(1) A fountain roller 143 and an ink reservoir 142 must be provided below the metering roller l. In particular, the ink reservoir 142 serves as a supply source for supplying a large amount of ink to the rotating fountain roller 143, as well as the fountain roller 143 and metering roller that rotate at high speed. Since it is provided to receive ink that has scattered or flowed down from each circumferential surface of the ink, it is large in size. Like this fountain roller
Because of the large ink reservoir and large ink reservoir, the inking device is large and its manufacturing and operating costs are high.

(2) In particular, when modifying an existing key adjustment type rotary press to create a fountain roller type keyless rotary press, remove the existing ink rail and install a new fountain roller in the empty space. - Since various equipment such as an ink reservoir and the like must be installed, major remodeling is required, which increases the cost of the remodeling and requires a long remodeling period.

As described above, converting existing rotary presses to keyless fountain roller type presses is a heavy burden on companies, and this has been an impediment to the shift to keyless presses.

(3) Since the fountain roller 143 rotates at high speed while contacting the metering roller with the pressure necessary to apply the ink to the circumferential surface of the metering roller 1, the metering roller wears out quickly. result,
After removing the excess ink with the doctor blade, the amount of ink retained in the cells on the circumferential surface of the metering roller changes, and as a result, the ink film thickness of the printing plate 149A"2 falls outside the range of appropriate ink film thickness. The life of the metering roller will be shortened. Therefore, the expensive metering roller must be replaced more frequently, increasing maintenance costs.

(4) Adjustment and maintenance of the fountain roller requires advanced technology and manpower, resulting in high costs.

The fountain roller type keyless inking device has the above-mentioned drawbacks.

In keyless rotary presses, as an inking device that performs ink supply and press-fit application by non-rotating operation,
Conventionally, there is a so-called pressure chamber type. Pressure chamber type inking devices mainly consist of a metering roller and an ink chamber (pressure chamber) that receives high-pressure ink supply, and are used in letterpress keyless rotary presses, keyless offset rotary presses, flexo/keyless letterpress combination machines, etc. Applied. An example of a pressure chamber type inking device is shown in FIG. 17. In FIG. 17, a metering roller l similar to that shown in FIG. 16 can be used.

+60 is a pressure chamber extending parallel to the axial direction of the metering roller 1 at a position facing the circumferential surface IA of the metering roller 1.

The pressure chamber 160 has an ink groove 161 that is open to the metering roller 1 side and extends long in the longitudinal direction of the pressure chamber 160, and doctor blades 162A on the outlet and inlet sides of the ink groove 161 in the rotational direction of the metering roller (2). 162B.

High-pressure ink can be supplied to the ink groove 161 by an ink pipe 163.

The pressure chamber 160 is a hydraulic cylinder (not shown)
The pressure chamber 160 can be rotated around the rotation axis 164 by the operation of the doctor blade 162A.
, 162B can be replaced or adjusted.

During printing, the pressure chamber 160 is strongly pressed against the circumferential surface IA of the metering roller l by the hydraulic cylinder. Therefore, the ink groove 161 is filled with ink V? The peripheral wall of l161 and doctor blades 162A, 16
7165 and 166, which are sealed against the circumferential surface IA of the metering roller 1 by 2B, are ink deposited on the roller! 67 and 168 are rider rollers, 169 is a plate cylinder, and 170 is an ink receiver.

As an example of a conventional keyless inking device, a pressure chamber type device has the above-described structure. Next, the effect will be explained.

During printing, the metering roller 1 rotates, the pressure chamber 160 is in pressure contact with the peripheral surface IA of the metering roller 1, and ink is supplied under high pressure into the ink groove 161. Therefore, the ink in the ink M161 is press-fitted onto the circumferential surface IA of the metering roller 1 at a position facing the ink 1161 due to its high pressure, and as the metering roller 1 further rotates, the circumferential surface IA The excess ink in the pressure chamber 1 is scraped off by the doctor blade 162A.
Metering roller l passed the position opposite to 60
A uniform, fixed amount of ink is held in the cells on the circumferential surface IA of the metering roller 1.The ink is transferred from the metering roller 1 to the printing plate 169A via the rollers 165 and 166, thereby printing. It is offered to

In this way, in the pressure chamber type keyless inking device shown in FIG. 17, as well as in the fountain roller type shown in FIG. Ink is plate 169A
Since the ink is supplied to the plate, the thickness of the ink film on the printing plate is also constant.

Therefore, there is no need to adjust the ink supply key according to the plate surface, and by realizing keyless printing, it can be expected to save manpower, improve printing quality, reduce paper waste after printing, and ultimately reduce costs.

However, the conventional pressure chamber type keyless inking device has the following drawbacks.

(1) A high pressure is applied to the ink in the pressure chamber 160 sealed by the doctor blades 162Δ and 162B so that the ink can be press-fitted into a large number of fine cells provided on the circumferential surface IA of the metering roller l. In addition, the pressure chamber 160 is designed to resist the high pressure of the ink and the metering roller l of the ink groove 161.
Since the pressure chamber 160 itself is pressed against the metering roller l with a strong force that can maintain a tight seal, the pressure chamber 160 itself needs to have rigidity and high precision to withstand the pressure and strong pressure of the ink. The support structure becomes large and highly precise, and the cost also increases.

(2) In particular, when modifying an existing key adjustment type rotary press into a conventional pressure chamber type keyless rotary press, remove the existing ink rail and install the pressure chamber 160 in the empty space. Since new equipment such as these will be installed, major remodeling is required, which increases the cost of remodeling and requires a long remodeling period. As described above, converting existing rotary presses to conventional pressure chamber type keyless presses is a heavy burden on companies, and this has been an impediment to the shift to keyless presses.

(3) The doctor blades 162A, 162B are strongly pressed against the circumferential surface IA of the metering roller 1 due to the high ink pressure in the ink groove +61, and the metering roller 1 rotates at high speed in this state, so the doctor blades and rapid wear of the metering roller, resulting in a shortened lifespan of the doctor blade and the expensive metering roller. Therefore, maintenance costs increase.

(4) The doctor blades 162A and 162B are integrally attached to the pressure chamber 160, and in this state, the metering roller of the pressure chamber 160! Adjustment of the sealed state for the doctor blades 162A, 162
Since the contact state of T3 with respect to the metering roller 1 is adjusted at the same time, these adjustment operations require time and effort. In particular, in order to uniformly press the tip of the doctor blade against the circumferential surface of the metering roller, high precision is required for the device itself and its adjustment, which increases costs.

[Problem to be Solved by the Invention 1] Conventional keyless inking methods and devices have been designed to be smaller, simpler, have a longer lifespan for metering rollers, be maintenance-free, and are easier to modify to make existing rotary presses keyless. It was hoped that this would be made easier.

The present invention solves these problems.

[Means to solve the problem 1 FIG. 1 is a diagram explaining the principle of the present invention.

In FIG. 1, l is a metering roller provided in an inking device of a rotary printing press. 1Δ indicates the circumferential surface of the metering roller l, and 2 indicates the rotation direction of the metering roller l.

Reference numeral 3 denotes a non-rotating press-fit coating device that is disposed opposite to the circumferential surface IA of the metering roller l and press-fits ink onto the circumferential surface IA by non-rotating operation.

In addition, the metering roller! The positional relationship of the non-rotating press-fit coating device 3 to the non-rotating press-fit coating device 3 is not limited to that shown in the drawings.

Non-rotating press-fit coating bag v! As 13, a pressure chamber to which ink is supplied under pressure can be used.

Reference numeral 4 denotes an ink supply means for supplying ink to the non-rotating press-fit coating device or the pressure chamber 3 under pressure.

In the ink supply means, ink may be supplied under pressure by feeding ink from an ink tank with a pump, or by using an ink head of an ink tank.

If the non-rotating press-fit coating device or pressure chamber 3 is classified according to the contact relationship between it and the circumferential surface IA of the metering roller 1, the non-rotating press-fit coating device or pressure chamber 3 will coat the metering roller 1 under high pressure. pressure contact type, in which the press-fit coating device or pressure chamber 3 is in slight pressure contact with the circumferential surface IA of metering roller l, with almost no pressure acting on it. It can be divided into a type and a non-contact type in which the press-fit coating device or the pressure chamber 3 does not contact the circumferential surface IA of the metering roller 1.

Furthermore, if the non-rotating press-in coating device or pressure chamber 3 is classified according to whether its position moves with respect to the metering roller, there is a fixed type in which the non-rotating press-in coating device or pressure chamber 3 does not move, and a fixed type in which the non-rotating press-in coating device or pressure chamber 3 does not move. It can be divided into a non-rotating type press-fit coating device and a movable type in which the pressure chamber 3 is movable depending on the operation of the turning machine and inking device.

In FIG. 1, 5 is a position # from the non-rotating press-fit coating device or pressure chamber 3 in the rotational direction 2 of the metering roller I, and removes excess ink 6 from the circumferential surface IA of the metering roller I. This shows an ink removal device for this purpose.

Note that the positional relationship of the ink removing device 5 with respect to the metering roller 1 is not limited to that shown in the drawings.

Further, the positional relationship between the non-rotating press-fit coating device or pressure chamber 3 and the ink removing device 5 is not limited to that shown in the drawings, as long as they are separate bodies.

The ink removing device 5 removes ink that is in excess of the appropriate amount of ink to be retained on the circumferential surface IA of the metering roller 1, out of the ink supersaturatedly supplied to the circumferential surface IA of the metering roller 1. By removing from the circumferential surface IA of the metering roller 1, the circumferential surface of the metering roller 1! Any device that can maintain a constant and uniform appropriate amount of ink on A may be used, and for example, a doctor blade, a roller for removing ink, or the like can be used.

FIG. 2 or FIG. 3 is a principle explanatory diagram showing limitations according to the present invention, respectively, regarding the configuration of a pressure chamber used as a non-rotating press-fit coating device in the present invention.

In FIG. 2, the pressure chamber 3 is connected to the ink j/#9 which receives the pressurized supply of ink and the ink press-fit application surface IO.
and has.

The press-fit application surface 10 is connected to the outlet side of the ink groove 9 in the rotation direction 2 of the metering roller 1,
Moreover, it is provided in the pressure chamber 3 so as to face the circumferential surface IA of the metering roller (2).

The press-fit application surface IO may be provided so as to be in contact with the circumferential surface IA of the metering roller l, or the circumferential surface of the metering roller ! By facing A with a slight gap, the circumferential surface lΔ of the metering roller l
An extremely narrow space may be provided between the pressure chamber 3 and the press-fit coating surface lO of the pressure chamber 3.

The press-fit coating surface 10 can be a flat or curved surface.

The press-fit coating surface 10 is formed so that the circumferential surface IA of the metering roller 1 and the press-fit coating surface 1 are connected to the circumferential surface IA of the metering roller 1 over the entire length of the press-fit coating surface 10 in the rotation direction 2 of the metering roller 1 or a part thereof.
It may have a shape such that the distance from O becomes narrower in the rotation direction 2 of the metering roller 1, or it may have a cylindrical inner surface concentric with the metering roller l.

In FIG. 3, the pressure chamber 3 has an ink groove 9 to which ink is supplied under pressure, and a tongue piece 11.

Said tongue piece l! is connected to the entrance side of the ink groove 9 in the rotation direction 2 of the metering roller I, and such that the tip 11A of the tongue piece 11 faces the circumferential surface IA of the metering roller 1, It is provided in the pressure chamber 3.

The tongue piece 11 is made of a rectangular plate material such as a thin steel plate.

[Function] In FIG. 1, when the rotary press to which the present invention is applied,
The metering roller 1 rotates in a rotational direction 2 shown by an arrow, and ink is supplied under pressure from an ink supply means 4 to a non-rotating press-fit coating device or a pressure chamber 3.

In this state, the metering roller! Focusing on a specific position of the circumferential surface IA of Ink is press-fitted onto the peripheral surface IA.

The metering roller l further rotates and the circumferential surface IA
When the position of is opposite to the ink removing device 5, the excess ink 6 that exceeds the appropriate ink holding amount among the ink applied to the peripheral surface IA is removed by the ink removing device 5, and as a result, the metering roller An even and constant amount of ink is held in the cells on the circumferential surface IA.

This metering roller! After the metering roller 1 further rotates, the ink held on the peripheral surface IA of the roller group is supplied to the printing plate 8A of the plate cylinder 8 by the transfer means 7, and is used for printing. .

Since the metering roller rotates continuously, the means for supplying ink to the printing plate 8A is also carried out continuously.

Moreover, since the ink retained on the metering roller IL by the ink removing device 5 is constant and uniform as described above, the film thickness of the ink formed on the printing plate 8A is also uniform and constant. High-quality printing is possible without requiring manual labor such as key adjustment.

According to the present invention, a non-rotating press-fit applicator or press-cut center 3 that is separate from the ink removal device 5 is used for press-fitting ink, so the entire keyless inking device is miniaturized. Furthermore, even when an existing key adjustment type inking device is modified to the keyless inking device of the present invention, the modification is easy and low cost.

Furthermore, wear of the circumferential surface IA of the metering roller 1 caused by the non-rotating press-fit coating device or the pressure chamber 3 and the ink removal device 5 is reduced, and maintenance costs and labor can be significantly reduced.

Further, since the non-rotating press-fit coating device or pressure chamber 3 and the ink removing device 5 are used separately, maintenance and adjustment of each is facilitated.

The circumferential surface of metering roller 1! In the press-fit application of ink to A, the metering roller 1 does not perform a contact rotation operation like a fountain roller type.
Wear on the peripheral surface IA is reduced. Moreover, by providing the non-rotating press-fit coating device or pressure chamber 3 and the ink removing device 5 separately, the metering roller 1, the non-rotating press-fit coating device or pressure chamber 3, and the ink removing device 5 can be installed near each other. , it is possible to capture ink that is about to scatter from them, and in this respect as well, it is possible to take measures against ink scattering.

Next, the supply of ink in the pressure chamber 3 used in the present invention will be explained based on FIG. 2 or 3.

In the keyless inking device of the present invention using the pressure chamber 3 shown in FIG. 2, ink is supplied under pressure to the ink groove 9 of the pressure chamber 3 as the metering roller 1 rotates.

The ink in the ink groove 9 is pressed by the above pressure toward the circumferential surface IA of the metering roller ■ located at a position facing the ink groove 9, and the ink in the ink groove 9 is pressed toward the circumferential surface IA of the metering roller 1 located at a position facing the ink groove 9. Since it rotates together with the circumferential surface IA, ink continuously enters between the press-fit application surface 10 of the pressure chamber 3 and the circumferential surface IA of the metering roller 1.

The pressure of the ink between the press-fit application surface 10 and the circumferential surface IA of the metering roller 1 increases as the metering roller 1 further rotates, so that the ink is reliably applied to the circumferential surface of the metering roller 1. Press-fitted onto IA.

The circumferential surface IA of the metering roller 1 to which the ink has been press-fitted escapes from the position facing the pressure chamber 3 as the metering roller (2) rotates.

In this way, the press-fit application surface 10 and the metering roller 1
Since the high pressure of the ink between the peripheral surface IA and the peripheral surface IA is used to apply the ink to the peripheral surface [A], the pressure itself when supplying the ink to the ink groove 9 is not necessarily the same as that of the ink. There is no need to use the high pressure required for press-fit coating, and therefore the pressure chamber 3 can be made smaller, and leakage of ink from the pressure chamber 3 can be prevented or greatly reduced. Therefore, it is easily possible to lower the contact pressure of the pressure chamber 3 to the circumferential surface IA of the metering roller l, or to make it a non-contact type, and in this respect as well, the wear of the metering roller l can be reduced. .

In addition, in the keyless inking device of the present invention using the pressure chamber 3 shown in FIG.
Since the pressure chamber 3 is provided with a tongue piece If, the ink receiver receives the ink to the transfer means 7 on the circumferential surface IA of the metering roller 1 after completing the transfer. While crushing the history with the tip 11A of the tongue piece 11, the ink in the ink groove 9 is guided toward the circumferential surface IA of the metering roller I, and the ink groove 9 is connected to the inlet side of the metering roller I in the rotation direction 2 and the meter. The pressure chamber 3 is sealed by sealing the space between the ring roller 1 and the circumferential surface IA.
This also contributes to preventing ink from leaking upward from the ink.

Embodiment] FIG. 4 to FIG. 7 show an embodiment of the present invention.
The figure is a front view, FIG. 5 is an enlarged sectional view of the main part of FIG. 4, and FIG. 6 is a side view of FIG. 5.

This embodiment includes a non-contact type pressure chamber 3 as a non-rotating press-fit coating device, an ink circulation pump 4 that circulates and feeds ink from an ink reservoir 22 through an ink filter 24 as an ink supply means, and an ink removal device. In this case, a doctor blade 5 is used. In addition,
The ink reservoir 22 serves both as an ink pan and an ink tank.

In FIG. 4, 20 is a press cylinder, 21 is a newspaper web as a printing medium, and 7A, 7B, 7G, and 7D are rollers constituting a roller group as means for transferring ink from a metering roller I to a printing plate 8A. 23 indicates an ink supply port for replenishing the ink reservoir 22 with ink.

The ink groove 9 provided in the pressure chamber 3 of this embodiment is
(See Figure 5)
, and extends long in a longitudinal direction 41 parallel to the axial direction of the metering roller l (see FIG. 6). The length of the ink groove 9 corresponds to, for example, the paper width of one page of a newspaper to be printed.

Note that 28 is an ink hole bored in the pressure chamber 3 in order to guide ink sent from the ink circulation pump 4 to the ink groove 9.

Referring to FIGS. 5 and 6, the pressure chamber 3 rests on rails 25 at both ends thereof, and has a set screw 2.
6, the pressure chamber 3 can be moved in a direction 4o toward and away from the metering roller l, and the position of the pressure chamber 3 can be fixed with a bolt 27 after this adjustment. Therefore, this embodiment is of a fixed type.

Referring to FIG. 5, the ink press-fit application surface 10 provided in the pressure chamber 3 in this embodiment faces the circumferential surface IA of the metering roller 1 with a slight gap therebetween. An extremely narrow space is open between the roller 1 and the press-fit application surface 10.

The shape of the press-fit application surface 10 is the same as the circumferential surface IA of the metering roller 1 near the entrance in the rotation direction 2 of the metering roller 1! 0 to the gap distance R at the intermediate position in the rotational direction, and then widens slightly to the gap distance S near the exit in the rotational direction.

In addition, the circumferential surface I of the metering roller ■ explained above
Distance of gap between A and press-fit application surface 10 and press-fit application surface IO
The change in shape is shown in an exaggerated manner for explanation in the fifth article.

In the rotary press to which the keyless inking device of this embodiment is applied, during printing, the metering roller l rotates and the ink in the ink reservoir 22 is circulated through the ink groove 9 of the pressure chamber 3 by the ink circulation pump 4. A large amount is supplied under pressure to supersaturation.

The ink in the ink groove 9 is drawn by the pressure received from the ink circulation pump 4 and the high speed rotation of the metering roller 1, and enters the gap between the circumferential surface IA of the metering roller 1 and the press-fit application surface 10. .

The ink in this gap is subjected to the rotational action of the metering roller 1 and narrows from the distance Q to the distance R, creating a high pressure and forcing the ink into a large number of cells on the circumferential surface 1 of the metering roller 1. .

After passing through the pressure chamber 3, the peripheral surface IA of the metering roller 1 has more ink m than the ink m necessary for printing attached as surplus ink, but the metering roller 1 does not rotate further. As a result, excess ink is scraped off by the doctor blade 5, so that an ink film of a constant thickness can be supplied to the printing plate 8A via the rollers 7Δ, 7B, 7C, and 7D.

Since ink is supplied without a key using the non-contact type pressure chamber 3 in this way, wear on the metering roller 1 can be significantly reduced. Therefore, maintenance costs and manpower are also reduced.

Since the ink pressure in the ink groove 9 can be set to a relatively low value of, for example, 1.05 atm to 1.1 atm or more depending on the viscosity of the ink, the pressure chamber 3 and its support structure can be made smaller and simpler. can be converted into

Since the doctor blade 5 is provided separately from the pressure chamber 3, the pressure of the ink application part does not act on the doctor blade 5, and the wear of the metering roller 1 by the doctor blade 5 is small.
Adjustment and maintenance are easy.

Furthermore, since the ink groove 9 has a large cross-sectional area and is elongated in the longitudinal direction 41 of the pressure chamber 3, even if the pressure of the ink supplied to the ink groove 9 is relatively low, the metering roller l The ink can be press-fitted over the entire axial direction of the metering roller l.

In the keyless inking device of this embodiment, since the ink supply pressure to the ink groove 9 can be lowered in this way, the pressure chamber 3 is
can be made contactless.

In the case of the non-contact type, the amount of ink leaking from between the pressure chamber 3 and the metering roller 1 is very small. However, if the ink pressure in the ink groove 9 becomes higher than the steady state because the rotation speed of the metering roller 1 is low when the rotary press is started, ink tends to leak into one of the pressure chambers 3. There is a way to prevent this!
As an example of means for controlling the speed of the ink circulation pump 4, it is possible to use means for controlling the speed of the ink circulation pump 4.

FIG. 4 shows a first example of the speed control means, in which the ink circulation pump 4 is driven by an inverter motor 44,
The rotation speed of the inverter motor 44 is controlled by an inverter control device 45.

The inverter control device 45 inputs the detection signal of the printing speed detection device 46 manually, and applies a predetermined proportionality constant to this input signal only in a predetermined printing speed range, for example, in a low speed range from the start of printing to 40,000 copies/hour. The machine has a built-in microcomputer with a memory that stores programs to control the amount of ink discharged.

FIG. 7 is a graph showing an example of the control.

Also, as a second example of speed control of the ink circulation pump,
Instead of the inverter motor, a motor with a continuously variable transmission may be used, and the other configuration may be the same as in the first example.

Furthermore, as a third example, the control signal in the first and second examples is provided in the ink transport pipe from the ink circulation pump 4 to the pressure chamber 3 instead of controlling the inverter motor 44 or the motor with a continuously variable transmission. The ink flowing out from the valve may be circulated to the ink reservoir 22 by controlling the opening of the valve.

FIG. 8 is a sectional view showing an example of a movable type in which the pressure chamber 3 moves during operation of the rotary press, as a modification of the embodiments shown in FIGS. 4 to 7.

In FIG. 8, the pressure chamber 3 rests on the bed 29 so as to be movable in the radial direction 40 of the metering roller 1. The pressure chamber 3 is urged toward the circumferential surface IA of the metering roller l by a spring 30. , 31 are stoppers that are fixed to the pressure chamber 3 and also serve as guides for the movement of the pressure chamber 3.

The bed 29 is mounted on the rail 25 and can be adjusted to move in the radial direction 40, and after this adjustment, the bed 29 can be fixed by bolts 27.

The bed 29 is adjusted so that, for example, when the metering roller I is stopped, the pressure chamber 3 comes into slight pressure contact with the circumferential surface IA of the metering roller I.

After adjusting in this way, when the rotary press is stopped, the ink groove 9 of the pressure chamber 3 is sealed by the circumferential surface IA of the metering roller l.
It is possible to further prevent ink leakage from.

Furthermore, when the rotary press is started, ink flows between the circumferential surface IA of the metering roller 1 and the press-fit application surface 10 due to the rotation of the metering roller 1, so that the ink flows against the biasing force of the pressure chamber 3 spring 30. , moves in the direction away from the metering roller I and stops, resulting in a slight gap between the circumferential surface IA of the metering roller 1 and the press-fit coating surface IO. As in the embodiment, the press-fit application of ink is performed in a non-contact manner.

Therefore, this embodiment also enjoys effects such as prevention of abrasion of the metering roller 1, reliable press-fit coating action due to the small gap between the metering roller indigo and the press-fit coating surface IO, and miniaturization of the pressure chamber 3. obtain.

In the two embodiments described above, the cross-sectional shape of the ink groove 9 is approximately U-shaped, but it can take other shapes.

FIG. 9 is a sectional view showing an embodiment in which the ink groove 9 has a dovetail cross-sectional shape, and the pressure chamber 3 may be of a fixed type as in the embodiments shown in FIGS. 4 to 7. ,
It may also be of a movable type as in the embodiment shown in FIG. By making the ink groove 9 into a dovetail shape, the metering roller l
Since the opening of the ink groove 9 facing the ink groove 9 is narrowed compared to the cross-sectional area or volume of the ink groove 9, the ink supply from the ink groove 9 to the circumference of the metering roller I, and then to the metering roller IA is -n can be made uniform both in the rotational direction of the ring roller l and in the circumferential direction.

10 and 11 show an embodiment using the tongue piece 11, FIG. 1θ is a sectional view, and FIG. 11 is a side view.

The tongue piece 11 is cantilevered on the upper part of the pressure chamber 3 by a screw 33 together with the flat plate 32, and covers almost the entire surface of the opening of the ink FR9.

In FIG. 10, the tongue 11 indicated by a dashed line shows the shape of the tongue 11 when no ink pressure is applied to the ink groove 9. At this time, the free end of the tongue piece 11, ie, the tip 11A, is connected to the ink groove 9 in the rotation direction 2 of the metering roller l.
It contacts the ink discharge surface 3A provided in the pressure chamber 3 so as to be continuous with the outlet side of the pressure chamber 3 and to be slightly inclined, thereby sealing the ink groove 9.

When the rotary press starts operating, the metering roller 1 starts rotating at a low speed and at the same time, ink is supplied under pressure into the ink groove 9. At this time, tongue piece l! is pushed and bent toward the metering roller l as shown by the two-dot chain line by the ink pressure in the ink groove 9, and the tip 11A of the tongue piece 11 is bent toward the metering roller l. makes slight pressure contact with the circumferential surface IA. Therefore, when the ink is supplied under pressure to the tongue piece 11, the ink is applied to the tongue piece 11.
This prevents upward leakage of the pressure chamber 3 from between the tip 11A of the metering roller 1 and the circumferential surface IA of the metering roller 1.

When the rotation speed of the metering roller l increases, the tongue piece!
When the ink discharged from between the tip lIA of l and the ink ejection surface 3A adheres to the circumferential surface IA of the metering roller 1, the ink immediately contacts the metering roller l and the press-fit application surface 1.
0, so the tip 11A of the tongue 11 and the metering roller! It is possible to further prevent leakage as shown in F from between the circumferential surface IA and the circumferential surface IA.

As a speed control means for the ink circulation pump, for example, an ink circulation device as shown in Fig. 4 is used to control the ink circulation amount to an optimum value according to the printing speed of the rotary press as shown in Fig. 7. If controlled, the tip 11A of the tongue piece 11
Pressure chamber 3 from between and metering roller l
The leakage of ink towards the L direction is further reduced. Therefore, as a modification of the embodiment shown in FIGS. 10 and 11, the mounting of the pressure chamber 3 in FIG. It may be modified so that the tip end +1A of the piece 11 and the circumferential surface IA of the metering roller 1 are not in contact with each other with a slight gap. In this case, wear of the metering roller 1 and the tongue piece 11 can be further prevented.

In this way, the tongue piece II has the effect of press-fitting ink uniformly onto the circumferential surface IAJ of the metering roller 1, and also has the effect of curing the history of ink on the circumferential surface IAJ: of the metering roller 1. What is the effect of preventing ink from overflowing to the upper part of the pressure chamber 3 during low speed printing?

Since the tongue piece 11 is also shaped to narrow the opening of the ink groove 9, it has the same effect as the embodiment shown in FIG. 9 in that respect.

The pressure chamber 3 of the present invention has a metering roller 1
Although it is possible to have a structure in which the ink groove 9 is divided into a part that adjusts distance movement and a part that constitutes the ink groove 9, and these parts are integrally connected, the embodiments shown in FIGS. 1O and 11
Another feature is that the ink rail in the conventional key-adjustable inking device shown in FIGS. 14 and 15, for example, is used as a part for adjusting distance movement to the metering roller. Therefore, by modifying the conventional inking device shown in FIGS. 14 and 15, the inking device shown in FIGS.
When implementing the embodiment shown in the figure, the ink rail main body 104 of the conventional ink rail is left, the ink rail cap +05 is removed, and the ink rail main body 104 is removed.
10, a pressure chamber 3 having an ink groove 9 and a tongue piece 11 may be attached. Note that the conventional ink cylinder 101 is replaced with a metering roller 1.

Since the ink rail main body 104 and its support structure can be used as is, the keyless inking device can be easily introduced with ease of modification work and short construction period.

In addition, since the pressure chamber 3 itself can be made small, it is easy to process the ink grooves 9 and attach the tongue pieces 11 during manufacture, which also reduces costs.

Note that 34 indicates a pressure gauge that measures the ink pressure within the ink groove 9.

12 and 13 show an embodiment that is a modification of the embodiment shown in FIG. 1θ and FIG.
The figure is a side view.

12 and 13, a block 35 extending in the longitudinal direction of the ink groove 9 is attached to the pressure chamber 3 by a screw 36. The block 35 divides the inside of the ink groove 9 into two axially extending chambers 38 and 39 having a large cross-sectional area.
and the inner wall of the ink groove 9 form a slit 37 therebetween. Therefore, the ink supplied under pressure to the ink groove 9 spreads in the chamber 38, is squeezed by the slit 37, and then exits to the chamber 39 again and is squeezed by the tongue piece 11 after spreading. Ink can be supplied more uniformly in the axial direction than in the illustrated embodiment.

[Effect of the invention 1] Since the present invention provides a non-rotating press-fitting device or a pressure chamber and an ink removal device separately, it is possible to downsize the inking device, extend the life of the metering roller, and make it maintenance-free. In addition, it is excellent in remodelability, and therefore, it is possible to promote keyless inking devices with high cost efficiency.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention. FIGS. 2 and 3 are explanatory diagrams of the principle showing limitations according to the present invention. FIG. 4 is a front view of an embodiment of the present invention. Figure 6 is an enlarged sectional view of the main part of Figure 4.
7 is a graph showing control of the ink circulation amount, FIG. 8 is a cross-sectional view of another embodiment, FIG. 9 is a cross-sectional view of yet another embodiment, and FIG. 10 is a graph showing the control of the ink circulation amount. 11 is a side view of the 1θ diagram, FIG. 12 is a sectional view of another embodiment using tongues, FIG. 13 is a side view of FIG. 12, and 14 The figure is a sectional view of a conventional key adjustment type inking device, FIG. 15 is an explanatory diagram of FIG. 14, FIG. 16 is a front view of a conventional keyless inking device, and FIG. 17 is another conventional keyless inking device. FIG. 2 is a cross-sectional view of the device. 1 is the metering roller + A is the circumferential surface of the metering roller, 2 is the rotation direction of the metering roller, 3 is the pressure chamber 4 is the ink supply means, 5 is the ink removal device, 9 is the ink groove, 10 is the press-fit application surface, 11 is a tongue piece.

Claims (4)

[Claims] (1) Applying ink to the circumferential surface of the metering roller by a non-rotating press-fit coating device installed opposite to the circumferential surface of the metering roller provided in a rotary printing press, and applying ink to the circumferential surface of the metering roller from the non-rotating press-fit coating device. A keyless inking method, characterized in that excess ink on the circumferential surface of the metering roller is removed by an ink removal device spaced apart in the rotational direction of the metering roller. (2) a metering roller; a pressure chamber for applying ink under pressure in contact with or in a non-contact state to the metering roller; an ink supply means for supplying ink under pressure to the pressure chamber; and a circumferential surface of the metering roller. A keyless inking device comprising a separate ink removal device for removing excess ink. (3) The pressure chamber includes: an ink groove that receives pressurized ink supply from the ink supply means; and an ink groove connected to the exit side in the rotational direction of the metering roller from the ink groove, and located on the circumferential surface of the metering roller. 2. The keyless inking device according to claim 2, further comprising a press-fit application surface facing the . (4) The pressure chamber includes: an ink groove that receives pressurized ink supply from the ink supply means; and an ink groove that is connected to the inlet side in the rotational direction of the metering roller, and that is connected to the ink groove at the tip of the tongue. The keyless inking device according to claim 2, further comprising a tongue piece facing the circumferential surface of the metering roller.