JPH0596711A - Ink feeder for offset press - Google Patents

Abstract

(57) [Summary] [Object] To provide an ink supply device of an offset printing machine having a simple structure capable of promoting the kneading action of ink. [Structure] Movable body 31 for holding the ink supply unit 4
Even in the standby state in which the ink feeding roller 8 is moved away from the master cylinder 2, the ink ductor roller 7 and the ink feeding roller 8 which are in contact with each other are rotated to knead the ink therebetween. As a result, the time for kneading the ink is increased, and the ink is sufficiently kneaded with a simple structure in which the ink ductor roller 7 and the inking roller 8 are provided one by one. When replacing the used ink, the movable member 31
Is removed from the master cylinder 2, the connection between the ink ductor roller 7 and the ink drive unit is cut off, and the ink supply unit 4 mounted on the movable body 31 is replaced, thereby making it unnecessary to wash the previously used ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply device for an offset printing machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
The ink 63 attached to the ink source roller 62 rotatably mounted on the
There is an ink supply device for an offset printing machine which is adapted to be applied to a master wound on a master cylinder 70 via a thickening roller 66, 67, 68 and 69. The ink kneading section 65 has a rotatable 8 contact with the ink supply path.
It has individual kneading rollers 71 to 78. Further, the calling roller 64 reciprocates between the ink source roller 62 and the kneading roller 71 to supply a required amount of ink 63 to the ink kneading section 65.

[0003]

In the conventional ink supply device, in the process of supplying the ink 63 to the master on the master cylinder 70, the ink 63 is fed by the ink kneading section 65.
Is sufficiently kneaded and the ink 63 is applied to the master so that there is no unevenness.
Since the ink cannot be kneaded only in the process of supplying the ink to the upper master, a large number of kneading rollers 71 to 78 and inking rollers 66 to 69 are necessary to sufficiently knead the ink 63 and apply it to the master. And Therefore, the structure becomes complicated, and the space for disposing the kneading rollers 71 to 78 and the inking rollers 66 to 69 must be widened. In addition, when changing the color of the ink, the ink fountain 61 containing ink of another color is exchanged, but many kneading rollers 71 to 78 and inking rollers 66 to 69 cannot be removed from the printing machine. The used ink must be washed before it adheres. This cleaning work is troublesome, and the hands are also dirty.

[0004]

According to the present invention, a rotatable master cylinder around which a master with an original image is wound and which is connected to a drive unit, and an outer periphery of the master cylinder can be freely moved toward and away from each other. A movable body which is driven by a movable body, a rotatable ink-feeding roller which is located near the outer periphery of the master cylinder, and a rotatable ink ducter roller which is in contact with the ink-feeding roller and is impregnated with ink. An ink supply unit that is detachably held by a movable body,
And an ink drive unit to which the ink ductor roller is detachably connected.

[0005]

Operation: By moving the movable body, the inking roller of the ink supply unit can be brought into contact with or separated from the master on the master cylinder, and the ink ductor rollers are in contact with each other in the state where the inking roller is separated from the master. And the ink-feeding roller can be driven by the ink drive unit, whereby ink can be kneaded between the ink-ductor roller and the ink-feeding roller even during standby other than when ink is supplied to the master. In the state where the inking roller is in contact with the master, the ink can be applied to the master while kneading the ink with the ink ductor roller and the inking roller. Therefore, it is possible to increase the time for kneading the ink, which allows the ink to be sufficiently kneaded with a simple structure in which only one ink ductor roller and one inking roller are provided. Also, by providing a plurality of ink supply units that store inks of different colors, the movable body is retracted from the master cylinder and the inking roller is separated from the master cylinder, and the ink ductor roller and the ink drive unit are separated from each other. The ink supply unit mounted on the movable body can be replaced by disconnecting the connection, and thus the color of the ink to be used can be changed without performing troublesome cleaning of the ink.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a side view showing the internal structure of the offset printing machine. In the figure, reference numeral 1 is a main body, and a master cylinder 2 and a blanket cylinder 3 which are driven by motors that can rotate in the normal and reverse directions, respectively, are rotatably provided on the main body 1 with their axes parallel to each other. An ink supply unit 4 and a dampening water unit 5 are provided near the master cylinder 2. The ink supply unit 4 contacts the ink case 6 in which ink is stored, the ink ductor roller 7 impregnated with ink, the inking roller 8 in contact with the ink ductor roller 7, and the inking roller 8. A blade roller 9 (see FIG. 2) is provided, and the ink ductor roller 7, the inking roller 8 and the blade roller 9 are rotatably held in the ink case 6. The dampening water unit 5 has a tank 11 for constantly dropping the dampening water into the container 10 at a constant level, a molton roller 12 immersed in the dampening water in the container 10, and contacting the molton roller 12. Water roller 13. A discharge passage 14 is provided along the tangential direction at the contact portion between the master cylinder 2 and the blanket cylinder 3, and insertion passages 15 and 16 are provided along the upper and lower surfaces of the discharge passage 14. One of the insertion passages 15 is for inserting a master wound around the master cylinder 2, and the other insertion passage 16 is for inserting a blanket sheet wound around the blanket cylinder 3. Further, the discharge passage 14 discharges the master removed from the master cylinder 2 and the blanket sheet removed from the blanket cylinder 3. A feed roller 17 is provided in the insertion passages 15 and 16, and a discharge roller 18 is provided in the discharge passage 14.
Is provided. The master cylinder 2 and the blanket cylinder 3 are formed with laterally long openings 19 along their axes on the outer circumferences thereof, and drive parts (not shown) are provided on both sides of the openings 19 in the longitudinal direction. Clamps 20 and 21 that are opened and closed by are provided.

Next, at the bottom of the main body 1, there are provided a paper feed cassette 22, a paper feed roller 24 for drawing out the paper 23 in the paper feed cassette 22, and a carrying belt 25 for carrying the paper 23. A rotatable impression cylinder 26 facing the outer circumference of the blanket cylinder 3 with the conveyor belt 25 in between is provided so as to move upward during printing. Further, a separation tape 27 for separating the paper 23 from the blanket cylinder 3 is provided between the blanket cylinder 3 and the transport belt 25, and a paper discharge fan 28 and a paper discharge tray 29 are provided at the rear portion of the main body 1. Is provided. Further, a handling roller 30 that comes into contact with the master cylinder 2 or the blanket cylinder 3 is provided. Although not shown, each of the handling rollers 30 is rotatably held by an arm, and is driven by the drive unit to be brought into contact with or separated from the outer circumference of the master cylinder 2 or the blanket cylinder 3.

As shown in FIG. 3, the ink case 6 of the ink supply unit 4 is detachably accommodated in a container-shaped movable body 31 having an upper opening. A plurality of protrusions 32 are formed on both sides of the ink case 6, and a notch 33 of an upper opening for positioning and holding these protrusions 32 is provided in the movable body 31.
Are formed on the upper edges of both sides. A release lever 34 for pressing the protrusion 32 toward the bottom of the notch 33 is urged in the clockwise direction inside the movable body 31 and is rotatably held around a support shaft 35. 34 are connected by a connecting rod 36. Further, rollers 37 are rotatably held on both sides of the movable body 31. Further, the movable body 31 is detachably held by the slide plate 38 by a clamp (not shown).

Although only one side is shown, side plates 39 facing each other are provided, and the inner surfaces of these side plates 39 are
A rail 40 that supports the roller 37 and a rail 41 that slidably holds the slide plate 38 are fixed. A cam plate 42 is fixedly provided on one side of the slide plate 38, and one side plate 39 is a slide for driving the movable body 31 and the slide plate 38 to move back and forth with respect to the master cylinder 2. A drive unit 43 is provided. This slide drive unit 43
Are gears 44, 45, 46 that are in mesh with each other, and gear 44
And a eccentric cam 47 which is fixed between the cam plate 42 and fixed to the gear 46. Therefore, when the gear 44 is driven, the rotation is transmitted to the eccentric cam 47, the cam plate 42 is guided by the rail 41 and slides together with the slide plate 38 and the movable body 31, and the ink is supplied in accordance with the rotation direction of the eccentric cam 47. The unit 4 is moved toward or away from the master cylinder 2.

Next, the structure of the ink driving section 48 for driving the ink ductor roller 7 will be described with reference to FIGS. 1 and 4. That is, the ink ductor roller 7 has the pulley 49 at one end. Belt 5 that contacts this pulley 49
0 is wound around pulleys 51 and 52 rotatably held on one of the side plates 39. And this pulley 5
A gear 53 that rotates integrally with the gear 2 and a gear 54 that rotates integrally with the master cylinder 2 are meshed with each other.
Further, the tension roller 5 that contacts the belt 50
The tension arm 56 that rotatably holds the side plate 3
It is rotatably held by a support shaft 57 provided upright on the shaft 9.
The tension arm 56 is biased clockwise by a spring 58.

In such a configuration, when printing is started, the master is wound around the master cylinder 2 and the blanket sheet is wound around the blanket cylinder 3, but initial processing is performed prior to this operation. The operation of the drive unit is controlled by this initial processing, and the clamps 20, 2 for the master cylinder 2 and the blanket cylinder 3 are controlled.
1 is released.

In FIG. 5, the tip of the master inserted from the insertion passage 15 is inserted into the opened clamp 20 of the master cylinder 2, and the blanket sheet inserted from the insertion passage 16 is opened into the clamp 20 of the blanket cylinder 3. And the tips of the master and blanket sheet are fixed by closing the clamp 21.

Next, the master is wound around the master cylinder 2 by driving the master cylinder 2 counterclockwise and the blanket cylinder 3 clockwise.
The blanket sheet is wrapped around the blanket cylinder 3. When the leading ends of the master and the blanket sheet pass the handling roller 30, the handling roller 30 presses the master on the master cylinder 2 or the blanket sheet on the blanket cylinder 3 by the operation of the driving unit to straighten the wrinkles. Then, the rotation of the master cylinder 2 and the blanket cylinder 3 progresses, and the handling roller 30 opens the opening 19.
The handling roller 30 projects into the opening 19,
The rear ends of the master and blanket sheets are bent inward of the opening 19, and at this time, the other clamp 21 is closed by the drive unit to fix the rear ends of the master or blanket sheet.

When the master is wound around the master cylinder 2, the inking roller 8 is separated from the outer periphery of the master cylinder 2 as shown in FIG. A tension roller 55 applies tension to the belt 50. When the master cylinder 2 is driven in the clockwise direction in this state, the rotation is transmitted to the belt 50 via the gear 54, the gear 53, and the pulley 52, and the pulley 49 that contacts the belt 50.
Rotates in the clockwise direction together with the ink ductor roller 7, and the inking roller 8 in contact with the ink ductor roller 7 rotates in the counterclockwise direction. That is, it is possible to knead ink between the ink ductor roller 7 and the inking roller 8 which are in contact with each other during the standby period in which the inking roller 8 separates from the master cylinder 2.

Then, the slide driving unit 43 is driven to slide the slide plate 38, the movable body 31, and the ink supply unit 4 toward the master cylinder 2 side.
As shown in, the inking roller 8 contacts the master on the master cylinder 2. In this state, the ink can be applied to the master while kneading the ink with the ink ductor roller 7 and the inking roller 8. At this time, the inking roller 8 receives the rotational force from both the master on the master cylinder 2 and the ink ductor roller 7, but the ink driving unit 48 of the ink drive unit 48 always rotates at the same speed as the peripheral speed of the master cylinder 2. Since the reduction ratio is set and the driving direction is also constant, the thickness of the ink on the inking roller 8 can be made constant by the blade roller 9. Therefore, the ink can be uniformly applied onto the master.

In this way, the ink can be kneaded during the standby period when the inking roller 8 is separated from the master cylinder 2 and the ink application period when the inking roller 8 is in contact with the master. Therefore, it is possible to sufficiently knead the ink with a simple structure in which the ink ductor roller 7 and the inking roller 8 are provided one by one.

Further, by providing a plurality of ink supply units 4 in which different color inks are stored, the slide plate 38, the movable body 31, and the ink supply unit 4 are retracted from the master cylinder 2 and the inking roller 8 is mastered. In the state of being separated from the cylinder 2, the connecting rod 36 is pushed down to release the release lever 34 from the protrusion 3 of the ink supply unit 4.
By removing it from 2, the ink supply unit 4 mounted on the movable body 31 can be replaced with the ink supply unit 4 for another color. As a result, the color of the ink used can be changed without performing a troublesome ink cleaning operation. In this case, even if the stroke of the slide plate 38 due to the rotation of the eccentric cam 47 is small, the movable body 31 and the slide plate 38 can be separated by operating the clamps. The supply unit 4 can be further separated from the master cylinder 2 (see FIG. 3). This allows
The pulley 49 of the ink ductor roller 7 can be separated from the belt 50 to easily attach and detach the ink supply unit 4 to and from the movable body 31 in a state where a large working space is provided.

[0018]

According to the present invention, a master on which an original image is drawn is wound, and a rotatable master cylinder connected to a drive unit is driven, and the master cylinder is driven so as to approach and separate from the outer circumference of the master cylinder. Attachable to and detachable from the movable body, which has a movable body, a rotatable inking roller that is close to the outer circumference of the master cylinder, and a rotatable ink ductor roller that is in contact with the inking roller and is impregnated with ink. Since it is composed of an ink supply unit that is freely held and an ink drive unit to which the ink ductor roller is detachably connected, by moving the movable body, the inking roller of the ink supply unit becomes a master on the master cylinder. Ink ductor roller and ink-feeding roller which can be brought into contact with each other and contact each other in a state where the ink-feeding roller is separated from the master. It can be driven by the ink tank drive unit, which allows the ink to be kneaded between the ink ductor roller and the replenishing roller during standby other than when ink is supplied to the master, and the replenishing roller can be used as a master. The ink can be applied to the master while kneading the ink with the ink ductor roller and the inking roller, and therefore the time for kneading the ink can be increased. Ink can be sufficiently kneaded with a simple structure that only one is provided, and by having multiple ink supply units that store ink of different colors, the movable body is retracted from the master cylinder With the roller separated from the master cylinder, the ink duct roller and the ink drive unit are disconnected from each other and mounted on the movable body. · The can exchange supply unit, thereby, an effect such as can change the color of the ink to be used without cleaning the troublesome ink.

[Brief description of drawings]

FIG. 1 is a side view showing the structure of an ink drive unit according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the ink supply unit has a cross section and the inking roller is brought into contact with the master cylinder.

FIG. 3 is a side view showing a structure of a slide drive unit that drives a movable body.

FIG. 4 is an exploded perspective view showing the structure of an ink driving unit.

FIG. 5 is a side view showing the internal structure of the offset printing machine.

FIG. 6 is a side view showing a conventional example.

[Explanation of symbols]

 2 master cylinder 4 ink supply unit 7 ink ductor roller 8 inking roller 31 movable body 48 ink drive unit

Claims (1)

[Claims] 1. A rotatable master cylinder around which a master on which an original image is drawn is wound and which is connected to a drive unit, and a movable body which is driven so as to approach and separate from the outer periphery of the master cylinder. It has a rotatable inking roller near the outer periphery of the master cylinder and a rotatable ink ductor roller in contact with the inking roller and impregnated with ink, and is detachably held by the movable body. And an ink drive unit to which the ink ductor roller is detachably connected.