JP2563172B2 - Ink device for rotary printing press - Google Patents

Description

TECHNICAL FIELD The present invention relates to an inking device for supplying ink to a plate surface on a plate cylinder in a rotary printing press.

[Conventional technology]

An inking device provided in a rotary printing machine such as an offset printing machine is provided with an ink fountain and a large number of roller groups, and the ink stored in the ink fountain is pulled up by the rotation of the ink fountain roller. The ink film adheres to the surface as an ink film, the ink film is transferred between the roller groups and is evenly kneaded in each direction and then kneaded, and then supplied to the plate surface on the plate cylinder by a deposition roller.

In such an inking device, the contact pressure between the depositing roller and the plate surface, so-called nip pressure, fluctuates due to thermal expansion of the roller, change in diameter due to wear, cylinder tailoring of the plate cylinder, and the like. Therefore, a nipping pressure adjusting device is attached to the inking device so as to adjust it during the preparatory stage of printing or during printing.

Conventionally, as this type of nip pressure adjusting device, for example, a device proposed by the present applicant and disclosed in Japanese Patent Application Laid-Open No. 58-175663 is known. In this nip pressure adjusting device, a plurality of receiving rollers are supported by swingable roller arms, and a spring member applies a rotational force to the roller arms in a direction of pressing the receiving rollers against the plate surface. By cooperation of the provided screw member and the spring member, each roller arm is individually swung to finely move the mounting roller.

[Problems to be solved by the invention]

However, in such a conventional inking device, since the operating positions of the knip pressure adjusting device are dispersed in several places as described above, the operator must frequently move between the printing units, so that the multicolor printing is performed. The machine required a great deal of adjustment time and labor, and it took too much time to perform strict nipple pressure control, which was a great mental burden.

[Means for solving problems]

In order to solve such a problem, according to the present invention, a plurality of cams rotatably supported on the left and right frame sides respectively corresponding to the respective roller arms supporting both ends of the plurality of receiving rollers. And a plurality of operating means for rotating and operating each cam by contacting the rollers pivotally mounted on each roller arm on the cam surface of each cam.

[Action]

When adjusting the nip pressure of the depositing roller with respect to the plate surface, when the operator is positioned at one place and sequentially operates a plurality of operating members, each cam rotates to rotate the roller arm and each depositing roller. Moves slightly in the radial direction of the plate cylinder, so the nip pressure is adjusted.

〔Example〕

1 and 2 show an example in which the inking unit of the rotary printing press according to the present invention is applied to an offset printing press.
FIG. 2 is a front view of the vicinity of the attaching roller, and FIG. 2 is a partially cutaway side view of the same. In these drawings, an inking device 2 of which only a part is shown is arranged above the plate cylinder 1 having a printing plate mounted on the peripheral surface thereof.
An ink fountain (not shown) in which ink is stored, an ink fountain roller that is pulled up by rotating in the ink fountain and adheres to the peripheral surface as an ink film, and an ink fountain that is sequentially contacted on the downstream side of the ink fountain roller. It is equipped with a large number of rollers such as a transfer roller, a shaking roller, a kneading roller, etc. Numerals 3 and 4 are a pair of swing rollers as the final rollers constituting these roller groups, which are rotatably rotatably supported by the left and right frames 5 via bearings 6 and 7 close to the plate cylinder 1. Not driven on the driving side so as to rotate and reciprocate in the axial direction. A roller arm 8 formed in a dogleg shape is rotatably fitted to the boss portion of the bearing 6 projecting inwardly from the left and right frames so that the axial movement thereof is restricted by a snap ring. The boss 7a of 7 has a roller arm 9 formed in a three-pronged shape.
And an L-shaped roller arm 10 are adjacent to each other and are rotatably fitted to each other with their movement in the axial direction restricted by a snap ring. The bearings formed on the free ends of the left and right roller arms 8, 9 and 10 pivotally support both end shafts of the wearing rollers 11, 12 and 13 whose peripheral surfaces are in contact with the swinging rollers 3 and 4, respectively. The roller arm 8 is provided with an interposing force in the direction of pressing the receiving roller 11 against the plate surface by a compression coil spring 15 recollected between the roller arm 8 and the stud 14 on the frame 5 side. Further, the roller arms 9 and 10 are given a turning force in a direction for pressing the mounting rollers 12 and 13 against the plate surface by a compression coil spring 16 stretched between their free ends. A kneading roller 17, which is one of the roller groups, is disposed on the left and right frames 5 via a bearing 18 on a substantially perpendicular bisector of the line connecting the shaft centers of the swing rollers 3 and 4.
The kneading roller 17 and the swinging rollers 3, 4 are supported by
Between the kneading rollers 19 and 2 which also constitute the roller group.
0 is provided on the rollers 3, 4, and 17 with their peripheral surfaces in contact with each other.
Three cams 21, 22, 23 for adjusting the nip pressure are adjacently and rotatably fitted to the inner protruding bosses 18a of the left and right bearings 18, and each cam 21, 22, 23 is It corresponds to the roller arms 8, 9 and 10, respectively. On the outer peripheral cam surface of each cam 21, 22, 23,
The rollers 24, 25, 26 pivotally attached to the free ends of the roller arms 8, 9, 10 opposite to the wearing rollers 11, 12, 13 are in contact with each other, and the cam surfaces of the cams 21, 22, 23 are Are formed on the respective gently curved surfaces having different phases so as to correspond to the rollers 24, 25 and 26. Further, arc-shaped teeth 21a, 22a, 23a are cut on a part of the outer circumference of each cam 21, 22, 23. In addition, in FIG.
Not shown as a and 23a overlap teeth 21a. 2
Reference numerals 7, 28 and 29 denote operation shafts with knobs, which are pivotally and non-slidingly supported in proximity to each other on the operation side frame 5, as operation members, and these inner protruding ends are provided with the teeth.
Pinions 30, 31 and 32 that mesh with 21a, 22a and 23a are respectively mounted on the shafts. By rotating the operating shafts 27, 28 and 29, the cams 21, 22 and 23 rotate and the roller arms. The fixing rollers 11, 12, 13 are finely moved via 8, 9, 10 to adjust the nip pressure.

The operation of the ink device configured as described above will be described. Prior to the printing operation, the nip pressure of the receiving rollers 11, 12, 13 is adjusted. That is, when the operator is positioned on the side of the operation side frame 5 and sequentially rotates the operation shafts 27, 28, 29, the cams 21, 21, 32a, 23a are meshed with the cam 21, 2
Since the rollers 23, 23 rotate and the rollers 24, 25, 26 slightly move due to the action of the cam surface, the roller arms 8, 9, 10 swing and the roller 1
Nip pressure is adjusted by fine movement of 1, 12, 13 in the radial direction of the plate cylinder 1.

After the nap pressure is adjusted in this way, when feeding is started and the printing cylinder is inserted, the setting rollers 11, 12, 13 have the adjusted nap pressure by a roller lifting device (not shown) by automatic or manual operation. Are pressed against the plates all at once. As a result, the ink in the ink fountain is transferred between the roller groups from the ink fountain roller to the shaking rollers 3 and 4, and then the receiving roller 11,
Supplied to the printing plate by 12,13.

In addition, in the present embodiment, an example in which the present invention is applied to an offset printing machine is shown, but it can be applied to various rotary printing machines such as an intaglio printing machine and a letterpress printing machine in the same manner.
The same effect is obtained.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, in the inking device of the rotary printing press, the left and right frame sides are rotatably associated with the respective roller arms supporting both ends of the plurality of receiving rollers. By providing a plurality of supported cams, and by providing a plurality of operating means for rotating the cams by contacting the cam surface of each cam with the roller pivotally attached to each roller arm, Since a plurality of operation members for pressure adjustment can be easily concentrated in one place, and an operator can operate the plurality of operation members at one place outside the frame, it is possible to operate them in the conventional machine. The operability and safety are greatly improved as compared with the case where a hand is put in and the operator operates a plurality of places, and the operation portion can be freely extended, and a sufficient operation space can be secured. In addition, the structure of the nap pressure adjusting device becomes extremely compact, and in particular, it can be applied to a model in which the inking unit is separated from the main unit and can be moved, which facilitates the unitization.

[Brief description of drawings]

1 and 2 show an embodiment of an inking device for a rotary printing press according to the present invention. FIG. 1 is a front view of the vicinity of a landing roller, and FIG. 2 is a partially cutaway side view of the same. 2 ... Inking device, 3 ... Shaking roller, 5 ... Frame, 8,9,10 ... Roller arm, 11,12,13 ... Wearing roller,
15,16 …… Compression coil spring, 21,22,23 …… Nip pressure adjusting cam, 21a, 22a, 23a …… Tooth, 24,25,26 …… Roller, 27,2
8,29 …… Operation axis, 30,31,32 …… Pinion.

Claims (1)

(57) [Claims] 1. A plurality of pairs of roller arms, one pair of which is supported on the left and right frame sides so as to be swingable, and a pair of left and right shafts supported by free ends of the pair of roller arms. In the inking device of a rotary printing machine, the plurality of forming rollers, and a spring member for applying a rotating force to each of the roller arms in a direction for pressing each of the forming rollers against the plate surface on the plate cylinder, A plurality of nip pressure adjusting cams are provided, which are rotatably supported on the left and right frame sides respectively corresponding to the roller arms, and have rollers pivotally mounted on the respective roller arms in contact with the cam surface. An inking device for a rotary printing press, comprising a plurality of sets of operating means for individually rotating the phases of the nip pressure adjusting cams.