JPH0450119Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a fountain-type ink supply device for printing machines, particularly offset printing machines.

2. Description of the Related Art Typical conventional ink supply devices using the above-mentioned method are shown in FIGS. 4 and 5. Reference numeral 1 denotes a fountain roller, which is rotatably supported by a machine frame 2 shown in FIG. A blade 3 is disposed toward the bottom of the fountain roller 1, this blade 3 is attached to a support plate 4, and this support plate 4 is attached to a fountain body 5. The fountain body 5 is rotatably supported by a core bar 7 on a crossbeam 6 (Fig. 2) fixed to the machine frame 2, and is fixed to the crossbeam 6 at a desired position by a handle shaft 8 (Fig. 2). When the handle shaft 8 is loosened, the entire fountain body 5 is tilted forward, and 24 is a stopper pin for regulating the tilting position.

Reference numeral 9 denotes a plurality of key shafts supported in parallel on the fountain body 5 at predetermined intervals, the tips of which are in contact with the back surface of the tip 10 of the blade 3, and the rear ends are connected to the eye link 11. This eye link 11 is slidably fitted into an eccentric ring 13 which is slidably fitted onto a support shaft 12 fixed to the fountain main body 5. Each eccentric ring 13 has a lever key 14
is integrally provided, and this lever key 14
By rotating the key shaft 9 around the support shaft 12, the key shaft 9 is slightly moved in the axial direction via the eccentric ring 13, and the tip portion 10 of the blade 3 is bent, so that the fountain roller 1 and the blade 3 are The gap C between the tip portion 10 and the tip portion 10 is individually and partially finely adjusted. 20 is a transfer roller that rotates in contact with the fountain roller.

A side plate 15 is attached to both ends of the support plate 4, and the side plate 15 is formed with an arc-shaped inner circumferential surface 16 whose front end surface is arranged with a slight running clearance between it and the outer circumferential surface of the fountain roller 1. It is being

An ink reservoir 19 is formed by the fountain roller 1, the blade 3, and the side plate 15, and the ink in this ink reservoir 19 is distributed in the gap C.
The liquid is then delivered to the outer peripheral surface of the fountain roller 1, which is rotated by a drive device (not shown). At this time, ink will leak from the running gap between the surfaces of the fountain roller 1 and the side plate 15, so the inner circumferential surface 16 of the side plate 15 has a structure as shown in FIG. . Inner peripheral surface 16
is provided with an oil groove 21, the upper end of which communicates with an oil hole 22 that penetrates to the surface, and a grease nipple 23 is connected to this oil hole 22 on the surface, and from this nipple 23 to the oil groove 21. It is filled with viscous grease to prevent ink from leaking.

As another example, although not shown, an elastic shaft sealing member such as an O-ring or an oil seal may be attached to the inner circumferential surface 16, and holding metal fittings may be attached at both ends of the inner circumferential surface 16 in the circumferential direction. There is also a type that locks with.

Note that 25 is a scale plate that displays the adjustment amount of the lever key 14.

Problems that the invention aims to solve However, among the above methods that use grease, when the fluidity of the ink and grease increases due to the effects of temperature rise due to high-speed operation of the printing press, grease may accumulate in the ink. There are disadvantages in that it is not possible to completely prevent ink from getting mixed in or leaking out of the side plate, and in the case where an elastic shaft sealing member is used, the member partially seals the inner circumferential surface of the shaft. As a result, not only is it difficult to maintain an even lip pressure, but also wear occurs and ink leakage cannot be sufficiently prevented.

The purpose of this invention is to eliminate the disadvantages of the conventional ink supply device as described above, and to ensure that the ink flows between the fountain roller and the side plate regardless of the viscosity of the ink or the operating speed of the printing press. To provide an ink supply device that prevents leakage from a running gap and does not stain the paper surface of running paper or the surroundings of equipment.

Means for Solving the Problems This invention achieves the above-mentioned objectives by dispersing and filling fine particulate solid lubricant into a fluid resin material, and then adding a liquid hardening agent and stirring to evenly distribute the lubricant. The invention is characterized in that a hardened coating layer is attached to the inner circumferential surface of the side plate, and the surface of this coating layer is brought into sliding contact with the surface of the fountain roller.

Such a coating layer has a small coefficient of friction, so even if it is pressed against a fountain roller to prevent ink from leaking from this area, no peeling or seizing will occur between the two, and the wear will be slight.

Embodiment An embodiment of this invention is shown in FIGS. 1 to 3, and most of it is the same as the conventional example described above, so the same reference numerals are used for the same parts. A detailed explanation will be omitted, and the different parts will be mainly explained.

The radius of the inner circumferential surface 16 of the side plate 15 from the center 17 of the fountain roller 1 is the radius R of the fountain roller 1 plus a required gap t, and the coating layer 18 filling this gap t is inside. It is attached to the peripheral surface 16. When installing this coating layer 18, the inner circumferential surface 16 is roughened, and a fine flow of molybdenum disulfide of about 1 μm is used as a solid lubricant in the form of fine particles. It is formed by dispersing and filling a material, such as an epoxy resin that hardens at room temperature, and then mixing and stirring a liquid hardening agent to make it homogeneous and then coating the material. In this forming operation, for a cylinder of a fixture (not shown) having an upright cylinder with a radius R,
The side plate 15 is fixed so that the inner circumferential surface 16 has a gap t between them, and the fluid resin material is injected and filled into the gap t, and then heated for 10 minutes at room temperature.
The hardened coating layer 1 is left on the inner peripheral surface 16 of the side plate 15 for several hours.
You can get one with 8 attached. In the case of an actual product, the thickness t at this time is 1 to 2 mm, and by pressing its surface against the surface of the fountain roller 1, it will be in close and sliding contact uniformly over the entire surface. However, due to the molybdenum disulfide contained in it, the friction coefficient is as small as 0.05 or less.
There is no risk of peeling or seizure between the two, and due to its wear resistance, wear is limited to around 6 to 7 μm.
The wear particles are not mixed into the ink and sent out.

In this embodiment, the covering layer 18 is made of the above-mentioned material, but it goes without saying that it may be made of other materials as long as they have the same effect.

Effects of the invention This invention is as described above, and the solid lubricant in the form of particulates is dispersed and filled into a fluid resin material, and a liquid hardening agent is further mixed in and stirred to make it uniform, and then coated and hardened. The layer is attached to the inner peripheral surface of the side plate, and the surface of this coating layer is brought into sliding contact with the surface of the fountain roller, so both surfaces can be in close sliding contact, and low viscosity ink can be used. Even if the ink is highly viscous and its fluidity increases due to chikilyrotropy, or if there is an increase in the rotational speed of the fountain roller or a rise in temperature, the ink may leak outward from the side plate. There is no contamination of not only the printing paper but also the machine and the work environment. Furthermore, the coating layer can be formed very easily using the solid lubricant, resin material, and liquid curing agent as described above, and the coating layer can also be easily attached to the inner circumferential surface of the side plate.

[Brief explanation of the drawing]

Fig. 1 is a sectional view taken along the line - in Fig. 2 of an embodiment of this invention, Fig. 2 is a partially cutaway side view of Fig. 1 viewed from the direction of the arrow, and Fig. 3 is a sectional view taken along the line - in Fig. 1. FIG. 4, which is a surface view of the inner peripheral coating layer of the side plate viewed from the direction, is a drawing similar to FIG. 1 of the conventional ink supply device, and FIG. 5 is a drawing similar to FIG. 3 of the same. 1...Fountain roller, 2...Machine frame, 3...
...Blade, 15...Side plate, 16...
Arc-shaped inner circumferential surface, 18...covering layer.

Claims (1)

[Claims for Utility Model Registration] A gap between a fountain roller 1 rotatably supported by a machine frame 2 and a tip of the fountain roller which is arranged to be inclined downward and sends out ink is adjusted. In the ink supply device of a printing press, which is equipped with a flexible blade 3 and a pair of side plates 15 having inner circumferential surfaces opposite to the outer circumferential surfaces of both ends of the fountain roller, solid lubricant in the form of particulates is supplied in a fluid form. A coating layer 18 that is dispersed and filled into a resin material, mixed with a liquid curing agent, and then uniformly coated and cured is attached to the inner circumferential surface of the side plate 15.
An ink supply device for a printing press, characterized in that the surface of the fountain roller 1 is brought into sliding contact with the surface of the fountain roller 1.