JPH1076636A - Roller device of rotary printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to miniaturize a device and to cost down by a method wherein an elastic body, which radially energizes a roller main body so as to abut against a companion roller, is interposed between a support and the roller main body. SOLUTION: Against a rider roller 3 as a companion roller, the shaft ends 3a of which are rotatably supported through bearings 2 provided on frames 1, a rubber roller 13 as a roller main body formed cylindrically as a whole is radially energized so as to abut. A pair of elastic bodies 7 are mounted between a pair of recessed parts 14a of the inner tubular part 14 of the rubber roller 13 and a supporting shaft 4. Between the outer tube 9 of each elastic body 7 and a pair of the recessed parts 14a, a pair of bearings 17 connected together through a collar are interposed by being prevented from coming off with snap rings 9 installed in the grooves made on the inner tubular part 14 and on the outer tube 9. Thus, the number of parts can be minimized and the miniaturization of a device and its cost down can be contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller device for an inking device and a water supply device in a rotary printing press, and more particularly to a roller device for a rotary printing press having a nip width.

[0002]

2. Description of the Related Art In general, in an inking device and a water supply device, printing is performed by applying a nip load between rollers that are in contact with each other in order to obtain ink or dampening solution having an appropriate film thickness.
By managing the nip width formed at this time,
Manage print quality. In order to obtain an appropriate nip width, various mechanisms have been conventionally proposed, and a typical one is disclosed in Japanese Utility Model Laid-Open No. 59-38045. What is disclosed herein is to obtain a predetermined nip width between a rubber roller and a kneading roller that rotates in contact with the rubber roller following the rubber roller.
The nip pressure adjusting mechanism includes a spring shaft that abuts on the end shaft of the rubber roller and a biasing unit that presses the spring shaft toward the end shaft.

[0003]

As described above, in the conventional rotary printing press, in order to obtain a nip width, a nip pressure adjusting mechanism is provided on an end shaft rotatably supporting a roller so as to be orthogonal to the end shaft. In this case, the size of the apparatus is increased, the nip pressure adjusting mechanism is complicated, and the number of components is large, leading to an increase in cost. In addition, since the rollers on which the nip pressure adjusting mechanism can be provided are limited due to space restrictions around the rollers, there is also a problem that the design is restricted.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a roller device of a rotary printing press which can reduce the size and cost of the device. It is in.

[0005]

In order to achieve this object, a roller device for a rotary printing press according to the present invention comprises a support supported on a frame side and a roller rotatably supported by the support. In a roller device of a rotary printing press having a main body, a mating roller that contacts the roller main body is provided,
An elastic body that urges the roller body in the radial direction and presses the roller body against the mating roller is interposed between the support body and the roller body. Therefore, when the elastic body is elastically deformed, a nip pressure is generated by the elasticity.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a cross section of a main part of the present invention in a roller device of a rotary printing press. In FIG. 1, a reference numeral 1 denotes a pair of left and right frames facing each other (one is not shown), and 3 denotes an end shaft 3 a rotatably supported via a bearing 2 provided on the frame 1. A gear (not shown) which is a kneading roller as a mating roller and which protrudes from the frame 1 and is fixed to a protruding end portion of the end shaft 3a to transmit rotation from the prime mover.

Reference numeral 4 denotes a support shaft as a support having small-diameter portions 4a, 4a (one not shown) formed at both ends thereof, which are fixed to a pair of frames 1, 1 facing each other. The chamfers 4b, 4b formed at both ends of the small-diameter portions 4a, 4a are attached to the pair of brackets 6, 6 (one not shown) having an L-shape in side view by bolts 5, so that the pair of frames 1 , 1 Reference numeral 7 denotes an elastic body formed in a cylindrical shape as a whole, and a metallic outer cylinder 9 and an inner cylinder 10 formed in a cylindrical shape with large and small diameters.
And a cylindrical elastic member 8 made of rubber, which is a synthetic resin having flexibility, interposed between the two cylinders 9 and 10.

The elastic members 7 are formed of a pair, and are attached to both ends of the support shaft 4 by fitting and fixing the inner cylinder 10 to the small diameter portion 4a of the support shaft 4 (one elastic member). The body 7 is not shown). Reference numeral 13 denotes a rubber roller as a roller body formed entirely in a cylindrical shape, and large-diameter concave portions 14a, 14a (one concave portion 14a) are provided at both ends of the inner peripheral surface.
(Omitted from illustration) is formed of a metallic inner cylindrical portion 14 and an outer peripheral portion 15 formed of a rubber material fixed to the outer peripheral surface of the inner cylindrical portion 14.

A groove between the inner cylinder 14 and the outer cylinder 9 is provided between the pair of recesses 14a, 14a of the inner cylinder 14 of the rubber roller 13 and the outer cylinders 9, 9 of the pair of elastic bodies 7, 7. The snap ring 19 attached prevents the collar 17
A pair of bearings 17, 17 (one bearing 17 is not shown) interposed therebetween are interposed. Therefore, the rubber roller 13 is mounted on the pair of bearings 1.
It is rotatably supported by the elastic body 7 via 7, 17. The support shaft 4 is stretched over the frames 1 and 1 such that the shaft center J is eccentric below the roller center R of the rubber roller 13 by e in the figure. Therefore, the kneading roller 3
Have a pair of elastic bodies 7, 7 and bearings 17, 17
, A load in the direction of arrow A in the figure is applied by the outer peripheral portion 15 of the rubber roller 13. When a load in the direction of arrow A is applied to the kneading roller 3, a portion of the elastic member 8 interposed between the support shaft 4 and the bearing 17 below the support shaft 4 is elastically deformed, and the elasticity thereof causes the rubber roller 13 to be elastically deformed. A nip pressure is generated between the roller and the kneading roller 3.

As described above, since the nip pressure is obtained by the elastic deformation of the elastic member 8 of the elastic member 7, the number of parts can be minimized, and the cost can be reduced. In addition, since the elastic body 7 is configured to be housed inside the rubber roller 13, the size of the apparatus is not increased. Further, since the space around the rubber roller 13 is not required for providing the elastic body 7, the elastic body 7 can be provided on any roller, and there is no restriction on the design, as in the conventional case. Since the nip pressure adjusting mechanism is provided in the apparatus, it is not necessary to change the design such as changing the arrangement of the rollers. Further, even if the peripheral surface of the outer peripheral portion 15 of the rubber roller 13 and the peripheral surface of the kneading roller 3 are worn and a slight change occurs in the diameter of the roller, the abrasion is absorbed by the elastic deformation of the elastic member 8. , A stable nip pressure is always obtained.
Further, by selecting the material of the elastic member 8 and changing the elastic coefficient of the elastic member 8, it is possible to select an appropriate nip pressure, so that it is not necessary to adjust the nip pressure. further,
A shim (spacer) is interposed between the chamfer 4 b of the support shaft 4 and the bracket 6. Alternatively, the nip pressure can be adjusted by providing a predetermined gap.

In such a configuration, when the rotation from the prime mover is transmitted to the kneading roller 3 through a gear fixed to the end shaft 3a of the kneading roller 3, the rotation of the motor comes into contact with the kneading roller 3 at a predetermined nip pressure. The rubber roller 13 rotates following the kneading roller 3 by frictional force between the rubber roller 13 and the kneading roller 3. At this time, since a predetermined nip width is formed between the rubber roller 13 and the kneading roller 3, ink or dampening water having an appropriate film thickness is formed on the peripheral surface of the kneading roller 3.

FIG. 2 is a front view showing a main part of a second embodiment of the present invention in cross section. In the second embodiment,
The second embodiment differs from the first embodiment in that the other kneading roller is a swing roller 23 that swings in the left-right direction in the figure and the elastic body is a coil spring 20. That is, the coil spring 20 is formed in a U-shaped cross section by a disk-shaped base 21 having a hole 21a formed in the center and an annular portion 22 having one end connected to the base 21 and the other end opened. A spring portion 22a is formed substantially at the center of the annular portion 22 in the axial direction, and a small-diameter portion 22b is formed at the open end.

The coil springs 20 are provided in a pair (one coil spring 20 is not shown) so as to be disposed symmetrically at both ends of the support shaft 4, and holes in the base 21 of the coil springs 20 are provided. The base 21 is fixed to the support shaft 4 by a pin 25.
Although not shown, a through-hole is formed in a part of the peripheral surface of the rubber roller 13 as a hole for inserting the pin 25. Each of the small diameter portions 22b of the annular portion 22 of the pair of coil springs 20 and the inner cylindrical portion 1 of the rubber roller 13
4 and bearings 17 and 1 fitted between the recesses 14a.
7, the rubber roller 13 has bearings 17, 17
And is rotatably supported by the small diameter portion 22b on the opening end side of the annular portion 22 of the coil spring 20 via the shaft.

The coil spring 20 thus configured has a small-diameter portion 22b on the opening end side of the annular portion 22 opposite to the base 21 because only the base 21 is fixed to the support shaft 4.
Can be elastically deformed in the directions of arrows AB and CD in the figure by the action of the spring 22a. Therefore, the rubber roller 13 rotatably supported by the small-diameter portion 22b of the annular portion 22 of the coil spring 20 via the bearing 15 can swing in the directions of arrows AB and CD.

Therefore, similarly to the first embodiment, a nip pressure is obtained between the coil spring 20 and the swing roller 23 by the elasticity of the coil spring 20 by elastic deformation in the B direction.
Since the rubber roller 13 swings in the CD direction following the left and right swinging motions of the swing roller 23, it is possible to prevent the occurrence of ghost and color unevenness.

In the present embodiment, an example in which the axis J of the support shaft 4 and the core R of the rubber roller 13 are concentric, the axis J is eccentric below the core R by e. However, the present invention is not limited to this, and the shaft core J and the core R may be made coaxial when the shaft core J is eccentric below the core R by e.

[0017]

As described above, according to the present invention, there is provided a supporting member supported on the frame side, and a roller body rotatably supported by the supporting member, and a mating roller contacting the roller body. And an elastic body that urges the roller body in the radial direction and presses the roller body against the mating roller is interposed between the support body and the roller body, so that the roller body comes into contact with the roller body with a contact pressure. Since a nip pressure is obtained between the roller and the mating roller by the elastic deformation of the elastic body, the number of parts can be minimized, and the cost can be reduced. In addition, since the elastic body is housed inside the roller body, the size of the apparatus is not increased, and the roller to which the elastic body is attached is not limited due to space restrictions. I will not receive it. Further, even if the roller body and the peripheral surface of the mating roller are worn and the diameter of the roller changes, a stable nip pressure can always be applied by the elastic deformation of the elastic body. In addition, since an appropriate nip pressure can be selected by selecting the material of the elastic body and changing the elastic coefficient of the elastic body, it is not necessary to adjust the nip pressure.

Further, according to the present invention, since the partner roller is an oscillating roller that is movable in the axial direction and is an elastic body that urges the roller body in the radial direction and the axial direction, ghost and color unevenness can be prevented. Generation can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing a cross section of a main part of a roller device of a rotary printing press according to the present invention.

FIG. 2 shows a second embodiment of the roller device of the rotary printing press according to the present invention.
It is a front view which shows the principal part of embodiment of this invention in a cross section.

[Explanation of symbols]

4 ... support shaft, 7 ... elastic body, 8 ... elastic member, 13 ... rubber roller, 20 ... coil spring.

Claims (4)

[Claims] 1. A roller device for a rotary printing press comprising a support supported on a frame side and a roller body rotatably supported by the support, provided with a mating roller that comes into contact with the roller body. A roller device for a rotary printing press, wherein an elastic body that urges the roller body in a radial direction and presses against the counter roller is interposed between the support and the roller body. 2. The roller device for a rotary printing press according to claim 1, wherein the mating roller is an oscillating roller that is movable in the axial direction, and is an elastic body that urges the roller body in the radial direction and the axial direction. A roller device for a rotary printing press. 3. The roller device for a rotary printing press according to claim 1, wherein the elastic body is a synthetic resin having flexibility. 4. The roller device for a rotary printing press according to claim 1, wherein the elastic body is a coil spring.