JP2502112B2 - Ink supply device for printing machine - Google Patents

Description

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

2. Description of the Related Art A typical type of conventional ink supply device of this type is as shown in FIG. In the figure, reference numeral 1 denotes a plate cylinder, to which a printing plate 2 is attached, and a closed fountain ink supply mechanism 3 and a dampening water device 4 are provided.

In the fountain ink supply mechanism 3, 6 is an ink fountain that stores ink, and is composed of an ink fountain roller 7 arranged above it or a dish-shaped container that holds the amount until it is constantly immersed in the ink 15. Ink fountain roller 7 detachably attached
Is rotatably supported by bearings mounted on the same machine frame, and is rotated at a speed corresponding to the printing speed in the direction of the arrow by a driving device (not shown). It is coated with a highly lipophilic material and heat treated. Is preferably provided.

A fountain blade 8 is composed of one or several thin plates and is arranged over the entire length of the fountain roller 7 and is held by an adjusting device 9 so that the gap between the roller and the fountain roller 7 can be maintained and adjusted to a predetermined value. Has been done.

11, 11 'are ink transfer rollers having rubber mounted on the surface, 12 and 14 are inking rollers and ink kneading rollers of the same structure, both of which are rotatably supported by bearings in a machine frame (not shown), 2. The ink cylinder 13 and the metering roller 10 are contacted and rotated.

The ink cylinder 13 is composed of a metal roller supported by a bearing on a machine frame (not shown) so as to be capable of rotating and reciprocating in the axial direction, and a gear and a reciprocating mechanism (not shown) provided at the shaft end of the plate cylinder 1 Driven.

The metering roller 10 is composed of a polygonal roller rotatably supported by bearings in a machine frame (not shown) or a metal roller having a cylindrical surface with protrusions such as spirals or diamonds, and is driven by a gear mechanism (not shown). To be done.

In the above-mentioned ink supply device, the ink 15 stored in the ink fountain 6 adheres to the surface of the fountain roller 7 which rotates at the same time as the start of printing, and is transferred in the arrow direction shown in FIG. Fountain blade 8
Only ink that has been blocked by the metering roller 10 and has passed through the adjusted gap between the tip of the blade 8 and the fountain roller 7 is transferred by the metering roller 10, and the transferred ink on the surface of the metering roller 10 is transferred to the ink. It adheres to the surface of the roller 11. The ink film on the surface of the ink transfer roller 11 is sequentially transferred on the surfaces of the ink transfer roller 11 ′, the ink cylinder 13 and the inking roller 12, and the reciprocating motion of the ink cylinder 13 makes the plate 2 of the plate 2 uniform and averaged. Adheres to the surface.

The dampening water supplied to the ink cylinder 13 by the dampening water device 4 is kneaded together with the ink on the surface of the ink cylinder 13 to form an emulsion state in which water is mixed into the printing plate 2
Adheres to the surface of.

On the surface of the printing plate 2, a printed image is formed by an image portion in an oil-sensitive state (ink-philic and hydrophobic) and a non-image portion in a non-oil-sensitive state (hydrophilic and oleophobic). Although the immersion water is in an emulsion state, the ink separates from the image area and the dampening water adheres to the non-image area. This state is transferred to the surface of the blanket cylinder (not shown),
Then, the blanket cylinder is transferred to the paper to complete the offset printing.

In the case of an offset rotary printing press, it is suitable to use an ink having a relatively low ink viscosity and fluidity in order to keep up with the speedup of the machine, and such an ink has come to be used. However, the offset printing machine requires an ink supply mechanism suitable for a wide range of ink viscosities. For this reason, it is optimal to use the closed fountain type ink supply mechanism as described above, and this is used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, in the ink supply device, an appropriate amount of ink is applied in accordance with a wide range of ink viscosity.
In order to always obtain a constant print quality by transporting to the blade 12, as a work for setting and maintaining the gap between the tip of the blade 8 and the fountain roller 7 to a predetermined value, the blade 8
Adjusting device 9 for each ink zone according to the width of the paper surface on which the projection distance and angle of the fountain roller 7 are printed.
Need to be adjusted by. However, this adjusting device 9
Since the adjustment work of the blade 8 by the operator was performed based on the experience and intuition of the operator, it is difficult to set the gap accurately, and it is difficult to convey the ink 15 to the inking roller 12 in an appropriate amount. In addition, there is a problem that the operation is troublesome and the work can be practically performed only by an expert.

Therefore, the present invention solves the problems with the conventional ones described above, and can convey an appropriate amount of ink to an inking roller according to a wide range of ink viscosities, and always obtain a constant print quality. Moreover, it is an object of the present invention to provide an ink supply device that allows even an unskilled person to easily perform the work.

Means for Solving the Problem In order to achieve the above-mentioned object, the present invention provides a fountain roller having a plurality of divided rollers which are separated from each other in the axial direction, and these divided rollers are arranged around each other. Drive mechanisms that change speeds and drive independently are installed separately. Further, it is preferable to install a plurality of fountain rollers. In this case, at least one fountain roller among them is divided into a plurality of divided rollers which are axially separated from each other, and these divided rollers are mutually separated. The drive mechanisms that are driven independently at different peripheral speeds are separately installed, and the fountain blades are installed over the entire length of the divided fountain rollers with a predetermined gap.

The amount of ink transferred from each roller surface of the fountain roller is adjusted by independently driving each of the divided fountain rollers and changing the peripheral speed thereof. Therefore, it becomes possible to convey an appropriate amount of ink to the inking roller for each ink zone according to the ink viscosity in a wide range.

Examples Hereinafter, examples will be described with reference to the drawings.

1 to 4 show the first embodiment. In this embodiment, the same parts as those in the prior art are designated by the same reference numerals, the description thereof will be omitted, and different parts will be mainly described.

In FIG. 1, 18 is a fountain roller, 19 is a thin plate, and is a fountain blade which is installed over the entire length of the fountain roller 18 with a predetermined gap.

As shown in FIG. 2, a plurality of fountain rollers 18 are provided in the axial direction corresponding to the respective ink zones (4 in this embodiment).
Rollers 18a-18d divided into individual pieces). Each of the rollers 18a to 18d is fitted into a hollow shaft 21 installed between the machine frames 20 and 20 'and rotatably supported by a bearing 22. An annular groove with a bottom is formed on the inner peripheral surface of each roller 18a-18d.
23 is formed, and an internal gear 25 is mounted on the bottom surface of the annular groove 23. Elongated holes 26, 27, 28, 29 are formed in a part of the hollow shaft 21 facing the internal gears 25 in the circumferential direction. Each internal gear 25 has a rotating shaft 31 arranged in the hollow shaft 21.
Gears 35 to 38 mounted on to 34 are meshed with each other through elongated holes 26 to 29.
Each 8d can be rotated independently. The rotating shafts 31 to 34 are transmission boxes 40, which are fixed to the outer surfaces of the machine frames 20, 20 '.
Bearings 41, 41 'of 40' are rotatably supported, and a bearing 42 suspended on the inner surface of the hollow shaft 21 is arranged on one side, which is the gears 35 to 38 side, to support each shaft. . Transmissions 44, 45, 46, 47 are installed on the rotation shafts 31-34 in the transmission boxes 40, 40 'to change the rotation speed of the drive shaft to a predetermined rotation speed and transmit it to the rotation shafts 31-34. Gears 50 to 53 are attached to the shaft ends protruding from the transmission. 55 and 56 are intermediate gears meshed with the gears 50 and 51 and the gears 52 and 53, respectively.
It is mounted on one end of a rotary shaft supported by transmission boxes 40, 40 '. Gears 57 and 58 are fitted to the shaft portions of the transmission boxes 40 and 40 ′ of the rotary shafts on which the intermediate gears 55 and 56 are mounted, and gears 61 and 62 on the drive shaft 60 are fitted to these gears, respectively. It is meshed. The drive shaft 60 is rotatably supported by a bearing 64 between the machine frames 20 and 20 ', and the drive shaft is provided at one end on the gear 61 side.
A drive member (not shown) is connected to rotate 60 in a proper functional relationship with the printing speed. The internal gear 25 and the gear 35,
The internal gear 25 and the gear 36, the internal gear 25 and the gear 37, and the internal gear 25 and the gear 38 are connected to the above-described transmissions 44 to 47 and the driving member, respectively, and the rollers 18a to 18d together. A drive mechanism is constructed that drives the motors independently by changing their peripheral speeds.

When the drive member is driven to rotate the drive shaft 60 in the above, the rotation is transmitted from the two gears 61 and 62 to the rotary shafts 31 to 34, and the internal gear 25 that meshes with the gears 35 to 38 of the rotary shafts.
The rollers 18a to 18d are thereby rotated. During this rotation, the rotation speeds transmitted to the rotation shafts 31 to 34 are changed to predetermined rotation speeds by the transmissions 44 to 47, so that the rollers 18a to 1 are rotated.
Each 8d is rotated with its peripheral speed changed.

FIG. 3 shows another example of division of the fountain roller 18. This fountain roller 18 is a machine frame 20, 20 '
A roller 18b is integrally provided at an intermediate position in the axial direction of a rotating shaft 67 rotatably supported by a bearing 66 therebetween.
The roller 18a is fitted and inserted in the rotary shaft 67 between the machine frame 20 and the machine frame 20.
It is rotatably supported by 8 and roller 1
Rollers 18c and 18d are fitted and inserted into a rotary shaft 67 between the 8b and the machine frame 20 ', and are rotatably supported by bearings 70 and 71, respectively.

A gear 73 is attached to one end of the rotary shaft 67 protruding from the machine frame 20. An annular recess 74 is formed on the end face of the roller 18a on the machine frame 20 side, and a gear 75 has a set screw 76 in the annular recess.
It is fixed by. Further, similar annular recesses 77 and 78 are formed on the end surface of the roller 18c on the roller 18b side and the end surface of the roller 18d on the machine frame 20 'side, and gears 80 and 81 are fixed by set screws 82 and 83, respectively. ing. The gear 80 on the rotary shaft 86, which is rotatably supported by the bearing 85 between the machine frames 20 and 20 ′, is meshed with the gear 80 of the roller 18c.
A gear 88 is attached to one end protruding from the gear 88. A pair of bearing members 89 are arranged on both sides of the gear 87, and bearings 90 for supporting the rotary shaft 86 are provided on the pair of bearing members 89.

Therefore, in the case of this example, when the gears 75, 73, 88, 81 are driven by the drive members, the rollers 18a to 18d are rotated. Then, by controlling the ability of each drive member corresponding to the gear, that is, the rotation output, each roller is controlled.
The peripheral speed of each of 18a to 18d is changed and rotated. The above-mentioned gears 75, 73, 88, 81 are respectively connected to the above-mentioned driving members and the like, and together with these, constitute a driving mechanism for independently driving the rollers 18a to 18d by mutually changing their peripheral speeds. .

FIG. 4 shows another example of division of the fountain roller 18.

This division example is characterized in that the rollers 18c and 18d shown in FIG. 3 have a double structure. That is, one side (the right side in FIG. 4) of the inner peripheral side base portion of the roller 18c extends to the vicinity of the machine frame 20 'and the bearing
The roller 18d is rotatably supported by 91, the roller 18d is inserted into the extended base portion 92, and is rotatably supported by a bearing 93. An annular recess 94 is formed on the end surface of the roller 18d on the machine frame 20 'side, and a gear is formed in this annular recess.
95 is fixed by a set screw 96. A gear 97 is attached by a key 93 to the base 92 of the roller 18c adjacent to the gear 95.

The structure of the rollers 18a and 18b other than the above is almost the same as that shown in FIG. Also, the gears 75, 73, 97, 95
Are connected to different driving members, etc., to form a driving mechanism for driving the rollers 18a to 18d independently of each other, and the rollers 18a to 18d are rotated at different peripheral speeds. Is the same as in FIG.

FIG. 5 shows a second embodiment. In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and different parts will be mainly described. 117,11
Reference numeral 8 denotes a fountain roller. The fountain roller 117 is arranged on the ink fountain 6 so as to be immersed in the ink 15, and the fountain roller 118 is rotatably installed on the fountain roller 117. The metering roller 10 is rotatably installed above the fountain roller 118 while maintaining an appropriate gap. 119 is a fountain blade having the same structure as the fountain blade 19 of the first embodiment, and is installed over the entire length of the fountain roller 118 with a predetermined gap. Further, the conventional ink transfer roller 11 'is omitted, and the ink transfer roller 11 and the metering roller 10 are adapted to rotate in the opposite directions to the conventional ones.

The fountain roller 117 has the same structure as the fountain roller 7 shown in FIG. 6, that is, it is an integral member which is not divided in the axial direction. On the other hand, the fountain roller 118 is composed of a plurality of axially disassembled rollers, and the mode of division thereof is one of those shown in FIGS. 2, 3 and 4 of the first embodiment. .

Even when the two fountain rollers 117 and 118 are installed in this way, the respective rollers of the fountain roller 118 that receive the transfer of ink from the fountain roller 117 are independently driven, and the peripheral speed is changed to change the surface of each roller. The amount of ink transferred is adjusted as in the first embodiment.

Although two fountain rollers are provided in the second embodiment, the number of fountain rollers may be three or more.

EFFECTS OF THE INVENTION The present invention having the above-described structure adjusts the amount of ink discharged from the surface of each fountain roller by independently driving each of the divided fountain rollers and changing the peripheral speed thereof. It is possible to convey an appropriate amount of ink to the inking roller for each ink zone according to a wide range of ink viscosities, and it does not require any troublesome work such as blade adjustment work by a conventional adjusting device. Therefore, it is possible to always obtain a constant print quality. In addition, the operation for adjustment is easier than that of the conventional one, and there is an excellent effect that even an unskilled person can easily perform the operation.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main portion showing a first embodiment of the present invention, FIG. 2 is an enlarged vertical sectional side view of the fountain roller portion, and FIGS. 3 and 4 are the fountain roller portions shown in FIG. FIG. 5 is an enlarged vertical sectional front view showing a different example of division, FIG. 5 is a longitudinal sectional front view of an essential portion showing a second embodiment of the present invention, and FIG. 6 is a longitudinal sectional front view of an essential portion showing a conventional example. 18,117,118 …… Fountain roller 19,119 …… Fountain blade

Claims (2)

(57) [Claims] 1. An ink supply device for a printing machine, comprising a fountain roller and a fountain blade installed at a predetermined gap from the fountain roller, wherein a plurality of fountain rollers are axially separated from each other. Ink supply device for a printing press, wherein each of the divided rollers is provided with a separate drive mechanism that independently drives the divided rollers by changing their peripheral speeds. 2. A plurality of fountain rollers are installed, and at least one of the fountain rollers is a plurality of divided rollers which are separated from each other in the axial direction. The divided rollers are mutually separated. 2. A drive mechanism that changes the peripheral speed and is independently driven is installed separately, and a fountain blade is installed over the entire length of the fountain roller with a predetermined gap from the divided fountain roller. Ink supply device for the printing machine described.