JPH0764051B2 - Inking device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inking device for a printing machine, and more specifically, for example, in an offset rotary printing machine, the ink is guided from an ink groove by a peripheral surface of an inking roller. Ink
The present invention relates to an inking device that supplies ink to a printing plate through an ink transfer roller and an ink supply roller group that are in intermittent contact with this.

[Conventional technology]

As a conventional technique for an ink device that supplies ink to a plate surface through an ink supply roller group from an ink delivery roller provided in an ink groove in a printing machine, first, Japanese Patent Publication No. 36-2467. Some are disclosed in the gazette.

It has two adjustable alignment cams provided on the ink take-up roller shaft, and the ink transfer roller swings between them, between the ink take-up roller and the most upstream roller of the ink supply roller group. It is a device that alternately contacts these two rollers and supplies ink to the plate surface through a group of ink supply rollers.

Further, there is an inking unit for a printing machine, which is disclosed in Japanese Patent Laid-Open No. 58-94468.

It has an ink groove and an ink ejection roller, and then
A profile roller having the same diameter as the uppermost stream roller of the ink supply roller group is arranged, and further, a plurality of rider rollers for stretching the ink are provided on the peripheral surface of the profile roller.

Then, next, an ink transfer roller is arranged, and rocks to alternately contact the profile roller and the most upstream roller of the ink supply roller group, and to a certain extent the rider roller transfers the stretched ink to the downstream ink supply roller group. It is an inking device that supplies ink to the printing plate.

[Problems to be Solved by the Invention]

However, such an inking device has the following problems.

First, in the inking device shown in Japanese Examined Patent Publication No. 36-2467, the ink transfer roller swings to the ink discharging roller side to the ink that has been led out as a film on the peripheral surface of the ink discharging roller from the ink groove. Contact with each other, undergo angular displacement according to the rotation of the ink take-out roller, and undergo ink transfer in a streaked state.

Then, the ink transfer roller oscillates and comes into contact with the most upstream roller side of the ink supply roller group, rotates according to the rotation of the most upstream roller, transfers the ink to the ink supply roller group, and at the roller peripheral surface length pitch, The muscle will be transferred.

Therefore, for example, if the number of rollers constituting the downstream ink supply roller group is small, or if the oscillation mechanism is insufficient, the ink cannot be evenly spread and the streaks transferred from the ink delivery roller -Shaped ink reached the plate surface without being spread, and as a result, streak-like shades appeared on the printed matter, resulting in uneven print density, resulting in deterioration of print quality.

Therefore, in order to prevent this, the number of rollers in the ink supply roller group was increased, but this was dealt with.
As a result, the composition of the ink supply roller group has become complicated, and the machine has become larger.

Further, in the inking device shown in JP-A-58-94468, in advance, the ink is stretched to a certain uniform thickness on the peripheral surface of a profile roller equipped with a rider roller, and in the case of JP-B-36-2467. By the same operation as the ink transfer roller, the ink on the peripheral surface of the profile roller is transferred to the downstream ink supply roller group by the ink transfer roller.

As a result, the ink kneading and spreading work in the ink supply roller group has become somewhat efficient, but in the ink transfer roller and the ink supply roller group, the ink device of Japanese Patent Publication No. 36-2467 is used. Since the same ink transfer will be performed, it is impossible to simplify the mechanism on the downstream side in spite of increasing the number of rollers on the upstream side of the ink transfer roller, which also simplifies the configuration and saves space. Was desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and by reducing the number of rollers in an ink supply roller group, good printing without unevenness in ink density is possible, printing quality is improved, and an ink supply roller group is provided. It is an object of the present invention to provide an inking device capable of simplifying the mechanism of (1), facilitating maintenance work accordingly, and achieving a great effect in terms of space saving and labor saving.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the inking device according to the present invention is an inking roller that guides ink from an ink groove, and an ink supply roller group that sequentially abuts to a plate surface,
The ink transfer roller that reciprocally swings so as to alternately come into contact with the most upstream roller of the roller group and the ink delivery roller, and the ink transfer roller that is slightly separated and faces the ink transfer roller, and the facing position is the most upstream roller. The peripheral surface of the ink transfer roller that contacts and rotates with the rider roller is located upstream of the contact position with the most upstream roller.

Also, the gap between the ink transfer roller and the rider roller can be adjusted.

[Work]

The ink drawn out from the ink groove by the peripheral surface of the ink take-up roller was streaked by the ink transfer roller swinging to the ink take-out roller side and making contact, and angularly displaced according to the rotation of the ink take-out roller. It is transferred to the ink transfer roller in the state.

Then, the ink transfer roller swings and contacts the upstreammost roller side of the ink supply roller group, and rotates according to the rotation of the upstreammost roller.

The ink on the ink transfer roller that has reached the gap between the rider roller and the ink transfer roller according to the rotation of the ink transfer roller contacts the rider roller when passing through this gap, rotating the rider roller, Part transfer.

By repeating the above operation a plurality of times, the ink surface of the rider roller retains an ink film having a thickness close to the gap between the ink transfer roller and the rider roller. When the ink transfer roller is angularly displaced or rotated in this state, the rider roller is angularly displaced or rotated in accordance with the angular displacement or rotation of the ink transfer roller due to the contact between the ink transfer roller peripheral surface and the ink film on the peripheral surface of the rider roller. Due to this rotation, the streaky ink transferred from the ink transfer roller to the ink transfer roller is instantly absorbed in the ink film retained on the peripheral surface of the rider roller when passing through the gap between the ink transfer roller and the rider roller. At the same time, the ink transfer roller peripheral surface and the rider roller peripheral surface are separated and transferred according to the transfer rate, and then transferred from the ink transfer roller peripheral surface to the ink supply roller group.

Further, the other peripheral surface portion of the ink transfer roller by the above rotation, the ink is continuously transferred from the ink film retained on the peripheral surface of the rider roller in a substantially constant thickness according to the transfer rate,
Subsequently, this ink is transferred to the ink supply roller group according to the transfer rate.

The thickness of the ink film retained on the peripheral surface of the rider roller can be changed by adjusting the gap between the ink transfer roller and the rider roller.

〔Example〕

FIG. 1 is a side view of the entire apparatus, showing the ink discharging means A.
And an ink transfer means B and an ink supply roller group C.

The ink discharging means A includes an ink groove 1 in which ink 4 is stored,
It is composed of an ink discharge adjusting plate 2, an adjusting screw 3, and an ink discharging roller 5, and the ink discharging roller 5 has its end shaft 5
a and 5b are rotatably supported by the frames 38 and 39 via bearings 30 and 30, and a gear 40 linked to an appropriate drive source (not shown) is fixed to one end shaft 5b via a key 41. A gear 31 is fixed to the other end shaft 5a via a key 32.

The ink transfer means B includes an ink transfer roller 6 and a shaft 7.
A rider roller 8 and a support shaft 9 rotatably supported by the frames 38 and 39 at both ends via bushes 22 and 22,
The eccentric sleeve 10 and the arm 11, that is, both ends of the shaft 7 are fitted and fixed to the respective ends of the arms 11 and 11 which are fitted and fixed to the support shaft 9, and the bearing 20 is fitted to the shaft 7.
The ink transfer roller 6 is rotatably supported via
Further, eccentric sleeves 10, 10 in which bearings 21 are externally fitted are fitted and fixed to the support shaft 9, respectively.
The rider roller 8 is rotatably supported via. The ink transfer roller 6 is provided between the ink delivery roller 5 of the ink delivery means A and the most upstream roller 12 of the ink supply roller group C with the support shaft 9 as a fulcrum by an arm 11 having one end fixed to the support shaft 9. The ink is transferred to the ink supply roller group C by rocking and alternately contacting the ink discharge roller 5 and the most upstream roller 12. Further, the gap α between the rider roller 5 and the ink transfer roller 6 can be adjusted by adjusting the rotational displacement of the eccentric sleeves 10, 10.

The swing mechanism of the ink transfer roller 6 with the support shaft 9 as a fulcrum is, for example, as shown in FIGS. 3 and 4, an arm 24 having an intermediate portion fixed to the end portion of the support shaft 9 that penetrates the frame 38.
A cam follower 25, 35, a pin 26, 28, a spring 27, a gear 31, 36, and a cam 34 rotatably attached to the end of the end shaft 5a of the ink take-out roller 5 by a snap ring 33. ,
It consists of a shaft 37 and a cam follower 25 at one end of the arm 24.
Is attached, and the spring 27 hooked to the pin 26 fixed to the other end is stretched between the pin 28 fixed to the frame 38 and
The cam follower 25 attached to the arm 24 is pressed against one side of the cam 34. Further, the cam 34 is on the other side, and the gear 36 is rotated by the rotation of the inking roller 5 via the gear 31.
The cam follower 35 provided in the eccentric position is engaged with the cam follower 35 by sandwiching both side surfaces thereof.

The ink supply roller group C includes the most upstream roller 12 and
It is composed of a plurality of rollers (not shown in detail) downstream thereof, and is subjected to the transfer of ink from the ink transfer means B to uniformly spread the ink.

Next, the operation of leading out the ink 4 from the ink groove 1 and supplying it to the most upstream roller 12 in this configuration will be described.

First, the ink 4 accumulated in the ink groove 1 is driven by an appropriate drive source (not shown) to the gear 40, which is fitted into the end shaft 5b of the ink delivery roller 5 and fixed by the key 41, The ink 4 is gradually rotated counterclockwise (indicated by the arrow in FIG. 1), and the ink 4 is led out in a film form on the roller peripheral surface from the gap between the ink discharge adjusting plate 2 and the ink discharge adjusting plate 2 which is adjacent to the ink. The ink film thickness is adjusted by the adjusting screw.

At the same time, the rotational drive transmitted from the end shaft 5b is freely rotatable to the shaft 37 fixed to the frame 38 via the ink delivery roller 5, the end shaft 5a, and the gear 31 fitted into the end shaft 5a and fixed by the key 32. Is transmitted to the gear 36 supported by
The cam follower 35 attached to the 36 is moved circularly about the shaft 37. This circular movement causes the cam follower 35 on the other side.
The cam 34 that engages by sandwiching both side surfaces of the rocks swings around the end shaft 5a as a fulcrum. Then, the ink transfer roller 6 is swung by the swing of the cam 34. That is, when the cam follower 25 pressed against one side of the cam 34 comes into contact with the mountain position of the cam 34 due to the swing of the cam 34, the ink transfer roller 6 causes the arm 24, the support shaft 9, and the arm 11 to move. When the cam follower 25 comes into contact with the position of the valley of the cam 34 due to the swing of the cam 34, the ink transfer roller 6, the arm 24, and the support shaft 9 are oscillated and displaced. Then, it swings and displaces via the arm 11 and comes into contact with the ink discharge roller 5.

By the swinging of the ink transfer roller 6, the ink guided in a film form on the peripheral surface of the ink delivery roller 5 is transferred to the most upstream roller 12.

First, when the ink transfer roller 6 oscillates toward the ink discharge roller side and comes into contact with the ink on the peripheral surface thereof, and when the ink transfer roller 6 is angularly displaced as the ink discharge roller 5 rotates,
Ink is transferred in a streaked state. Subsequently, the ink transfer roller 6 swings toward the uppermost stream roller 12 side and comes into contact therewith, and rotates counterclockwise in accordance with the rotation of the uppermost stream roller 12.

The rider roller 8 follows the rotation of the ink transfer roller 6.
The ink on the ink transfer roller 6 reaching the gap between the ink transfer roller 6 and the ink transfer roller 6 contacts the rider roller 6 when passing through this gap and rotates the rider roller 8 while partially transferring to the peripheral surface thereof.

By repeating the above operation a plurality of times, the peripheral surface of the rider roller 8 retains an ink film having a thickness close to the gap size α between the ink transfer roller 6 and the rider roller 8. Then, the rider roller 8 is constantly in contact with the peripheral surface of the ink transfer roller 6 through this ink film, and is angularly displaced or rotated according to the angular displacement or rotation of the ink transfer roller 6. In addition, the ink film retained on the peripheral surface of the rider roller 8 is the ink discharge roller 5
When the streaky ink transferred from the ink transfer roller 6 to the ink transfer roller 6 passes through the gap between the ink transfer roller 6 and the rider roller 8 due to the angular displacement or rotation of the ink transfer roller 6, the nodular ink is contained in the ink film. The ink is instantly absorbed, and the ink is transferred to the peripheral surface of the roller 6 according to the transfer rate.

Further, the ink film retained on the peripheral surface of the rider roller 8 is continuously transferred to another peripheral surface portion of the ink transfer roller 6, that is, a streak-shaped ink peripheral surface portion, with an ink having a substantially constant thickness according to the transfer rate. .

That is, the ink film retained on the peripheral surface of the rider roller 8 comes into contact with the peripheral surface of the ink transfer roller 6 to rotate, thereby making the ink on the peripheral surface of the ink transfer roller 6 have a substantially constant thickness.

The ink on the peripheral surface of the ink transfer roller 6 is subsequently transferred to the ink supply roller group C in accordance with the transfer rate by the ink transfer 6 contacting the uppermost stream roller 12 and rotating.

As described in detail above, the ink transferred to the ink transfer roller 6 is retained as an ink film having a substantially constant thickness on the peripheral surface of the rider roller 8 and is streaked on the peripheral surface of the ink transfer roller 6. Of the ink is absorbed, and a substantially constant amount of ink is transferred to other parts.

Therefore, as described above, the ink on the peripheral surface of the ink transfer roller 6 is in a substantially constant state in the vicinity of the rider roller 8, and the ink having a substantially constant thickness is always transferred from the ink transfer roller 6 to the most upstream roller 12. To be done.

Therefore, the burden of spreading the ink on the ink supply roller group C is reduced, and the number of rollers of the ink supply roller group C can be reduced. That is, it is possible to simplify the mechanism of the ink supply roller group C and save space.

Then, the rider roller 8 can change the gap α between the rider roller 8 and the ink transfer roller 6 by adjusting the eccentric sleeve 10, thereby adjusting the thickness of the ink film supplied to the most upstream roller 12.

Further, by directly driving the rider roller 8 by a driving means (not shown), formation of an ink film on the peripheral surface of the rider roller 8 and its operation efficiency can be improved.

Although the embodiment of FIG. 1 described above shows the case where the rotation direction of the inking roller 5 and the rotation direction of the most upstream roller 12 are different, the embodiment of FIG. 2 shows the case of the same direction.

In FIG. 2, the ink transfer roller 6 is the most upstream roller 12
It contacts with and rotates clockwise to transfer the ink.

Therefore, unlike the embodiment of FIG. 1, the rider roller 6 has a bearing (not shown) on the shaft 16 installed between the arms 15, 15 (one of which is not shown) so as to be above the ink transfer roller 6. ) Is rotatably provided via an eccentric sleeve 10 fitted outside. Other configurations and operations are the same as those in the first aspect.
This is similar to the illustrated embodiment.

〔The invention's effect〕

The rider roller 8 makes it possible to transfer the ink on the peripheral surface of the ink transfer roller 6 to a substantially constant thickness and transfer it to the most upstream roller 12 of the ink supply roller group C on the downstream side, and kneading the ink in the ink supply roller group. Since the burden of spreading can be reduced, the number of rollers in the ink supply roller group C can be reduced, and good printing without unevenness in ink density is possible, which improves printing quality and simplifies the mechanism of the ink supply roller group C. It is possible to reduce the number of workers, and the maintenance work is facilitated accordingly, which has a great effect in saving space and manpower.

In addition, since the gap between the rider roller 8 and the ink transfer roller 6 can be adjusted, it is possible to supply a good ink suitable for the ink used and the paper used, and also to improve the print quality.

[Brief description of drawings]

1 and 2 are sectional side views of the entire apparatus showing an embodiment.
FIG. 3 is a side view showing a drive system of the ink transfer means B of FIG. FIG. 4 shows a side-by-side view of the ink discharging means A and the ink transferring means B shown in FIGS. 1 and 3. A is an ink discharging means, B is an ink transferring means, C is an ink supply roller group, α is a gap, 1 is an ink groove, 2 is an ink discharge adjusting plate, 3 is an adjusting screw, 4 is ink, 5 is an ink discharging roller, 6 is an ink transfer roller, 8 is a rider roller, 10 is an eccentric sleeve, and 12 is the most upstream roller.

Claims (2)

[Claims] 1. An ink delivery roller for leading out ink from an ink groove, an ink supply roller group that sequentially abuts on a plate surface, and rocks so as to alternately abut the most upstream roller of the roller group and the ink delivery roller. The ink transfer roller, which faces the ink transfer roller, is slightly separated from the ink transfer roller, and the facing position of the ink transfer roller is in contact with the most upstream roller, and the rotating surface of the ink transfer roller is closer than the most contact position with the most upstream roller. An inking device characterized by having a rider roller on the upstream side. 2. The gap between the ink transfer roller and the rider roller can be adjusted.
Inking device described.