JP2902344B2 - Bearings for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus provided in a printing section of a rotary printing press, which supports a printing surface provided on an outer periphery of a rotating body to be supported, such as a support device for supporting a printing cylinder such as a blanket cylinder. The present invention relates to a bearing for a printing press that supports an axial center so that it can be moved so that it can be in contact with or separated from an outer peripheral surface of another rotating body such as a provided plate cylinder or an impression cylinder.

[0002]

2. Description of the Related Art As a typical movement of a printing cylinder of a rotary printing press, the movement of a blanket cylinder provided in an offset printing press is shown in FIG.
Shown in As shown in FIG. 2A, in the printing state of the offset printing press, the blanket cylinder 2 includes the plate cylinder 1 and the impression cylinder 3
The printing is performed by transferring the print image transferred from the plate cylinder 1 to the printing paper 4 passing between the impression cylinder 3 by contacting the rotation outer peripheral surface of the printing cylinder.

As shown in FIG. 2B, when the printing paper 4 does not pass between the impression cylinder 3 and the impression cylinder 3, these three cylinders 1, 2, and 3 must be separated from each other. Without
The axis 2 ′ of the blanket cylinder 2 is moved in the directions indicated by arrows 5 so as to be away from the respective axes of the plate cylinder 1 and the impression cylinder 3.
The outer peripheral surfaces of the two cylinders 1, 2, 3 are arranged so as to be separated from each other.

Further, when the thickness of the printing paper 4 changes in the printing state shown in FIG. 2A, in order to properly maintain the pressing force of the blanket cylinder 2 against the printing paper 4, that is, the so-called printing pressure. In addition, it is necessary to adjust the clearance between the blanket cylinder 2 and the impression cylinder 3, and the axial center 2 ′ of the blanket cylinder 2 is moved in the direction indicated by the arrow 6 so that the clearance between the outer peripheral surfaces of the blanket cylinder 2 and the impression cylinder 3 is changed. To adjust.

In order to realize such a movement necessary for a printing machine, a supporting device 1 for rotatably supporting a blanket cylinder 2 is provided.
For 0, the one having the structure shown in FIG. 3 is employed. That is, the shaft end of the blanket cylinder 2 is provided with an inner bearing and an outer bearing on the inner peripheral side and the outer peripheral side of the eccentric intermediate race ring 7b, respectively.
And a supporting device 10 which is supported by an eccentric metal 8 interposed therebetween.

FIG. 3A shows a rotary bearing 7 in which the outer bearing is a tapered roller bearing. The inner bearing ring 7a fitted and fixed to the shaft end of the blanket cylinder 2 is shown in FIG.
A roller 7c is rotatably interposed between the outer circumference of the intermediate race 7b and the inner circumference of the intermediate race 7b to form an inner bearing of a tapered roller bearing. Outer race ring 7d fitted and fixed to the inner peripheral surface
Arm 11 connected to an eccentric intermediate race 7b by forming a rotary bearing 7 forming an outer bearing of a tapered roller bearing by rotatably interposing a roller 7e between the arm 11 and the inner periphery of the intermediate race 7b.
Thus, by changing the rotation angle of the intermediate race 7b, the shaft end axis 2 ′ of the blanket cylinder 2 can be moved in the direction of arrow 5 shown in FIG. 2B. .
The rotation of the intermediate race 7b for performing this movement is performed by the intermediate race 7
Since the rollers 7c and 7e are interposed on the inside and outside of b, it can be made by relatively lightly turning.

Further, the outer race 7d of the rotary bearing 7 is fixed on the inner peripheral surface, and the eccentric metal 8 inserted into the hole 14 formed in the frame 9 is rotated, whereby the shaft end of the blanket cylinder 2 is rotated. The axis 2 'can be changed in the direction of arrow 6 shown in FIG. Outer race 7 of this rotary bearing 7
d and the eccentric metal 8 interposed between the holes 14 of the frame 9
Since only a gap of several tens of μm (theoretical gap at the time of processing) is provided between the outer peripheral surface and the inner peripheral surface of the hole 14 formed in the frame 9 to secure printing quality, the printing pressure is low. The rotation of the eccentric metal 8 for making the angle is appropriate is hard.

Next, the rotary bearing 7 'shown in FIG. 3B in which the outer bearing is a needle bearing has substantially the same structure as that shown in FIG.
Each of the outer peripheral surface of the intermediate race 7b 'and the inner peripheral surface of the outer race 7d' is not provided with a taper, is made a flat surface, and is provided with one roller 7f which is not divided in the width direction. It is arranged to be rotatable.

In FIG. 3, reference numeral 12 denotes an intermediate race 7
An oil cover for preventing the leakage of the lubricating oil from the blanket cylinder 2 of the b and 7b 'together with the outer race retainer 13. As described above, the supporting device 10 that supports the shaft end of the blanket cylinder 2 and is capable of moving the shaft center 2 ′ is a conventional device.
Although three types are illustrated, in the following description, for the sake of simplicity, the rotary bearing will be described using a rotary bearing 7 having a structure shown in FIG.

[0010] While supporting the blanket cylinder 2 rotatably,
The bearing 10 configured to be able to move the axis of the blanket cylinder 2 in the direction of arrow 6 shown in FIG. 2A and in the direction of arrow 5 shown in FIG. 2B is configured as described above. Therefore, when the blanket cylinder 2 is rotating at a high speed, the roller 7c interposed between the inner race 7a and the intermediate race 7b rotates at a high speed, causing the rolling friction and the forced flow of the lubricating oil. The heat is generated by turbulent diffusion heat and the like, and the temperature inside the rotary bearing 7 rises.

As described above, when heat is generated in the rotary bearing 7, of the generated heat, the heat transmitted to the inner race 7 a has a large heat capacity of the blanket cylinder 2, and the heat for heat dissipation. Since the heat surface area is large, the heat is efficiently radiated to the atmosphere, so that the temperature of the inner race 7a and the like does not rise remarkably, and there is no problem caused by this. Since the intermediate race 7b is in an adiabatic state and there is no escape for heat, a problem occurs due to a temperature gradient between the eccentric metal 8 and the intermediate race 7b.

That is, the roller 7e interposed between the inner peripheral surface of the eccentric metal 8 and the outer peripheral surface of the intermediate race ring 7b can maintain the intermediate race ring even when the blanket cylinder 2 rotates at a high speed, as described above. The intermediate race 7b is rotated by the arm 11 connected to the arm 7b, and the shaft center 2 'of the blanket cylinder 2 is viewed from the arrow 5 in FIG.
The outer peripheral surface of the intermediate raceway ring 7b is merely connected to the inner peripheral surface of the eccentric metal 8 via the outer raceway ring 7d in a line contact state without rotating except when moving as shown in FIG. Therefore, the heat transmitted to the intermediate race 7b is not transmitted to the eccentric metal 8, the heat is accumulated in the intermediate race 7b, and a large temperature gradient is generated between the eccentric metal 8 and the intermediate race 7b. It will be.

As a result of this temperature gradient, the intermediate race 7
b causes relative expansion with respect to the eccentric metal 8, the intermediate race ring 7b pushes the roller 7e to the outer peripheral side, further expands the eccentric metal 8, and adjusts the gap between the blanket cylinder 2 and the impression cylinder 3. The eccentric metal 8 to be rotated and the frame 9 slip, there is no proper gap, the eccentric metal 8 cannot be rotated, and the rotation of the eccentric metal 8 causes the axial center of the shaft end of the blanket cylinder 2 to rotate. The fluctuation shown by the arrow 6 in FIG. 2A cannot be performed, and the gap between the blanket cylinder 2 and the impression cylinder 3 according to the thickness of the printing paper 4 can be adjusted, that is, the printing pressure can be appropriately maintained. This makes it impossible to perform high-quality printing.

In particular, immediately after the operation at a high bearing temperature, this phenomenon is remarkably observed, and even if the amount of oil supplied to the rotary bearing 7 is increased to solve this problem, there is no effect at present. is there.

[0015]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems which occur in a conventional bearing for a printing press by providing an adiabatic state and increasing the amount of heat radiated from an intermediate race having no escape of heat. Therefore, even during high-speed rotation, the temperature gradient generated between the eccentric metal and the intermediate race is reduced, and the gap provided between the eccentric metal and the frame is maintained at the theoretical gap at the time of processing, and printing is performed. An object of the present invention is to provide a bearing for a printing press in which the pressure can be adjusted appropriately and the eccentric metal can rotate freely.

[0016]

For this reason, the bearing for a printing press according to the present invention has the following means. A rotatable body provided with a printing surface on its outer circumference is rotatably supported, and the distance between the axis of the rotatable body and the axis of another rotatable body arranged side by side is changed by changing the rotation angle, and the printing surface is changed. A plurality of heat dissipating fins having high thermal conductivity for promoting heat dissipation are mounted in the radial direction on the outer surface of the intermediate raceway which makes contact with or separates the outer peripheral surface of the rotating body.

The bearing for a printing press according to the present invention is insulated by the above-described means when the printing press is rotated at a high speed, and is heated to a high temperature. Convection, radiation, etc.) effect is enhanced, so-called adiabatic condition is released, and rolling friction of high-speed rotating rollers interposed between the inner race and the intermediate race, or turbulent diffusion due to forced flow of lubricating oil The heat transmitted to the intermediate race is released to the outside without being accumulated in the intermediate race due to heat generation or the like.

Further, the radiation fins can be easily cooled by the lubricating oil outside the rotary bearing, so that the intermediate race can be effectively cooled.

[0019] Thereby, the temperature rise of the intermediate race can be reduced, the thermal expansion can be reduced, and the temperature gradient between the eccentric metal and the frame can be reduced. Extrusion, the gap between the eccentric metal and the hole in the frame is held at the theoretical gap during processing, and the eccentric metal can change the rotation angle freely, reducing the thickness of the printing paper. Accordingly, the gap between the printing cylinder and the cylinder for transferring the printing paper can be appropriately adjusted, and high-quality printing can be maintained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bearing for a printing press according to the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a first embodiment of a bearing for a printing press according to the present invention, and FIG.
Is a cross-sectional view, and FIG. 1B is a view taken along the line AA shown in FIG.
1 (c) is an inner side view taken along the line BB shown in FIG. 1 (a). In the drawing, components having the same reference numerals as those shown in FIG. 3A are the same or similar members, and description thereof will be omitted.

As shown in the drawing, on the frame side of the intermediate race 7b, that is, on the inner side where the blanket cylinder 2 is provided, the lubricating oil in the rotary bearing 7 flows out between the frames 9 to prevent the lubricating oil from flowing out between the frames 9. Along with the presser 13, an oil cover 12 to be prevented is attached. Further, an arm 11 for rotating the intermediate race 7b is attached to the outside of the intermediate race 7b, and the arm 11 is pushed and pulled by a link or the like in the direction of arrow 15 shown in FIG. 1 (b). I have. By rotating the intermediate race 7b by the pushing and pulling, the intermediate race 7b is rotated.
Is eccentric with respect to the axis 2 ′ of the blanket cylinder 2, the axis 2 ′ of the blanket cylinder 2 moves in the direction indicated by the arrow 5 in FIG.

In this embodiment, the radiation fins 16 and 17 are attached to the inside of the oil cover 12 and the outside of the arm 11, respectively. That is, the oil cover 1
2. The material of the arm 11 and the radiation fins 16 and 17 is selected from materials having high thermal conductivity and having no problem in the strength of the device, and the radiation fins 16 are arranged radially outside the arm 11. At the same time, the radiation fins 17 are provided radially inside the oil cover 12.

The radiating fins 16 are convected with the atmosphere.
The radiating fins 17 rotate by high speed of the roller 7c interposed between the inner race 7a and the intermediate race 7b, and lubricating oil accompanying the rotation of the roller 7c due to convection with the atmosphere and heat radiation by spraying the lubricating oil. The heat generated by the turbulent diffusion heat generated by the forced flow and transmitted to the intermediate race 7b can be effectively released to the outside of the rotary bearing 7.

As a result, the temperature gradient between each of the intermediate race 7b, the eccentric metal 8, and the frame 9 is suppressed low, the relative thermal expansion of the intermediate race 7b is reduced, and the inner peripheral surface of the hole 14 of the frame 9 is The gap formed between the eccentric metal 8 and the outer peripheral surface can be kept the theoretical gap at the time of processing.

As a result, the arrow 18 shown in FIG.
The movement of the link in the direction, that is, the rotation of the eccentric metal 8,
The printing is always performed normally, and the adjustment to the thickness of the printing paper 4 is smoothly performed, so that high-quality printing can be performed.

[0026]

As described above, according to the bearing for a printing press of the present invention, by the structure shown in the claims, by preventing the thermal expansion of the intermediate race, the gap between the frame and the eccentric metal is prevented. Even when rotating at high speed, the theoretical gap at the time of proper processing is maintained, and the eccentric metal can smoothly rotate with the change in the thickness of the printing paper, and the eccentric metal that makes the printing pressure appropriate The rotation angle can be adjusted and high quality printing can be maintained.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a bearing for a printing press according to the present invention, wherein FIG. 1 (a) is a cross-sectional view, and FIG. 1 (b) is FIG.
FIG. 1C is an outer side view taken along the line AA shown in FIG.
Is an inner side view taken along the line BB shown in FIG.

2A and 2B are cross-sectional views illustrating the movement of a blanket cylinder of an offset printing press performed during printing. FIG. 2A is a diagram illustrating printing and adjustment corresponding to paper thickness, and FIG. Is a diagram showing when printing paper does not pass,

FIG. 3 is a sectional view showing a conventional bearing for a printing press.
FIG. 3A is a diagram illustrating a supporting device in which the outer bearing is a tapered roller bearing, and FIG. 3B is a diagram illustrating a supporting device in which the outer bearing is a needle bearing.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate cylinder 2 blanket cylinder 2 ′ blanket cylinder axis 3 impression cylinder 4 printing paper 5 direction of separation of cylinder outer peripheral surface 6 printing pressure adjustment direction 7 rotation bearing 7 a inner raceway ring 7 b intermediate raceway ring 7 c (inner) roller 7 d outer raceway ring 7 e (Outer) roller 8 Eccentric metal 9 Frame 10 Support device 11 Arm 12 Oil cover 13 Outer race ring holder 14 Frame hole 15 Arm pushing / pulling direction 16 Heat radiation fin 17 Heat radiation fin

Claims (1)

(57) [Claims] 1. A rotating body provided with a printing surface on an outer periphery thereof is supported by a bearing having an eccentric intermediate race and an eccentric metal, and the rotation of the intermediate race and the eccentric metal causes the rotating body to rotate. A bearing for a printing press, wherein a plurality of radiating fins are radially arranged on an outer surface of the intermediate race, in a bearing for a printing press capable of moving an axis of a rotating body.