JPH028303Y2 - - Google Patents

Description

[Detailed description of the invention] (Purpose of the invention) This invention supplies an appropriate amount of anti-offset liquid to the copying roll at the right time in an electronic copying machine, and also prevents offset prevention when the copying machine is not in use. It is an object of the present invention to provide a means for supplying offset prevention liquid that can prevent wasteful flow of the prevention liquid and staining of roll-related mechanisms.

Conventionally, in electronic copying machines and the like, methods for supplying anti-offset liquid to fixing rolls such as heating rolls and pressure rolls include applying the liquid to the roll with a brush or felt by sucking up the liquid through capillary action; There are some that apply liquid to a roll using a coating pad that is constantly supplied with liquid from a storage tank. When an electronic copying machine is not in use, there is no need to supply anti-offset liquid.
In the conventional apparatus described above, regardless of whether the copying machine or the like is in operation or not, the supply of liquid to the roll surface continues unless the liquid storage tank is removed.
Not only does it consume a lot of liquid, but especially in the case where the liquid is allowed to flow down onto the coating pad, the roll surface and related mechanisms of the roll get wet with the liquid, which causes paper dust and the like to stain the apparatus. In addition, there is a drawback that the paper becomes stained after the start of operation due to the oversaturated offset prevention liquid supplied to the roll surface when not in use.

This invention can eliminate the above-mentioned drawbacks of conventional offset prevention liquid supply means by making it possible to supply an appropriate amount of liquid at the right time. Explain the idea.

(Structure of the invention) In other words, 1 is a fixing roll A consisting of a heating roll Aa and a pressure roll Ab.
This is an offset prevention liquid storage tank provided along the axial length of the heating roll Aa and above it. Storage tank 1 can be moved up and down, and the tank has a viscosity of 500~
10,000c.s. of anti-offset liquid is charged.
The storage tank 1 is also provided with a plurality of on-off valves along its length at appropriate intervals. An example of this on-off valve is shown in FIGS. 3 and 4, and as shown in the figure, a valve hole 2 with a diameter of 0.4 to 0.9 mm is inserted into a valve hole 2 with a diameter of 0.1 to 0.3 mm in the bottom wall 11 of the storage tank 1.
The valve stem 3 is inserted, one end of the valve stem 3 is fixed to the valve body 4, and the valve body 4 is elastically supported by a valve spring 5 whose one end is fixed to the tank wall of the storage tank 1, and an offset is made to contact the heating roll Aa. The end of the valve stem 5 is engaged with a pad B for applying the prevention liquid, and the opening/closing valve described above is operated by driving the storage tank 1 up and down by a mechanical or electromagnetic drive device (not shown). I have it working.

According to the embodiment described above, the plastic ring 12
A metal thin tube 13 is fitted into the metal thin tube 13, and the valve hole 2 is formed by the tube hole of the metal thin tube 13, and a valve spring 5 made of a coil spring is integrally formed on the valve stem 3. This simplifies the manufacture of the on-off valve and allows for easy opening and closing. The assembly of the valve into the storage tank 1 is facilitated. According to this embodiment, the on-off valve is a so-called inner valve, and
It is obvious that by driving the storage tank 1 downward, the valve opens as shown in Fig. 3, and by driving it upward, the valve closes as shown in Fig. 4. According to another embodiment, which is located outside the bore 2 and is a so-called outer valve, contrary to the previous example, the valve opens when the reservoir 1 rises and closes when it falls. Further, according to the illustrated example, the storage tank 1 corresponds to the heating roll Aa, but the offset prevention liquid is supplied to the heating roll of the fixing roll A.
Since it may be supplied to either Aa or pressure roll Ab, the storage tank 1 may be provided corresponding to pressure roll Ab. The storage tank 1 filled with offset prevention liquid may be supplied as a cartridge so that it can be replaced as the liquid is consumed, or it may be connected via a conduit to a large-capacity sub-tank (not shown) so that the amount of liquid consumed can be automatically adjusted. It is also possible to design it to be refilled.

(Effect of the invention) This invention is made as described above, and a plurality of on-off valves are provided along the length of the offset prevention liquid storage tank 1, and by vertically driving the storage tank 1, these on-off valves are turned on and off at the same time. However, since the liquid storage tank 1 is located immediately above the fixing roll via the valve, and the liquid is supplied by its own weight via pad B, there is no flow from the storage tank to the roll surface. Since the supply distance of the liquid can be set extremely short, supply and stop of the liquid can be precisely controlled, and therefore the required amount of anti-offset liquid can always be supplied to the roll surface via the pad. Also, according to this invention, the viscosity of the offset prevention liquid can be reduced.
The valve hole diameter is set to 0.4 to 0.9 mm, and the valve stem diameter is set to 0.1 to 0.3 mm, making it convenient for users of copiers etc. to obtain offsets. In addition to being able to use a protective liquid, the appropriate amount of liquid is retained in the pad, so there is no risk of liquid accumulating at the interface between the roll surface and the pad and contaminating the paper. There are no obstructions that prevent the liquid from flowing out of the pores. Therefore, there is no waste in liquid consumption, and the natural dripping of liquid that often occurs when conventional copying machines and the like are not in use is completely prevented. Thus, according to this invention, problems caused by oversaturation of the liquid on the roll surface and staining around the roll can be avoided, and unnecessary consumption of the liquid can also be prevented. Furthermore, according to this invention, since the valve stem whose end engages with the applicator pad is inserted through the valve hole, the liquid flowing down to the pad through the valve hole is caused by the wetting phenomenon based on the interfacial tension of the liquid. The liquid flows down the valve stem, and therefore the copying mechanism can be kept clean without wetting any parts other than the pad. In addition, it is easy to appropriately design the supply amount, which is related to the viscosity of the liquid, due to the difference in the cross-sectional area of the valve hole and valve stem. Since only a small amount of liquid is required and the storage tank can be small, the cartridge type design can contribute to making copiers smaller and lower in cost, providing many conveniences. Can be done.

[Brief explanation of drawings]

Fig. 1 is a front view showing the main parts of an embodiment of the device according to this invention, Fig. 2 is a bottom view of the storage tank, and Fig. 3 is a section along the cutting line of Fig. 1 of the storage tank with the on-off valve in the open state. The corresponding enlarged cross-sectional view, FIG. 4 is a diagram showing the closed state of the on-off valve, FIG. 5 is a cross-sectional view similar to FIG. 3 in another example of the storage tank, and FIG. 6 is shown in FIG. 1. It is a side view of an Example. A is a fixing roll, Aa is a heating roll, Ab is a pressure roll, B is a pad, 1 is a storage tank, 11 is a bottom wall,
12 is a plastic ring, 13 is a metal tube, 14 is a vent hole, 2 is a valve hole, 3 is a valve stem, 4 is a valve body, and 5 is a valve spring.

Claims (1)

[Scope of utility model registration request] The fixing roll A has a roll that can be driven up and down and has a viscosity of 500 to 500, in accordance with the axial length of the roll to which the anti-offset liquid is applied and immediately above it.
A storage tank 1 charged with 10,000 c.s. of anti-offset liquid is provided, and the following on-off valves are provided along the length of the storage tank 1 at appropriate intervals. A valve stem 3 with a diameter of 0.1 to 0.3 mm is inserted into a valve hole 2 with a diameter of 0.4 to 0.9 mm bored in the bottom wall 11.
is inserted, one end of the valve stem 3 is fixed to the valve body 4, and the valve body 4 is elastically supported by the valve spring 5 whose one end is fixed to the tank wall of the storage tank 1. An offset prevention liquid supply device for an electronic copying machine, etc., in which the end of a valve stem 5 is engaged with a pad B for application, and the opening/closing valve is operated by vertically driving a storage tank 1.