JPS602603Y2 - Fixing device for copying machines, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fixing device for a copying machine or the like in which a release agent is applied to a fixing roll.

Conventionally, in a fixing device, a release agent such as silicone oil has been applied to a fixing roll for the purpose of preventing offset generation and for other purposes, and an example of the structure thereof will be described with reference to FIG.

First, a fixing roll 1 and a pressure roll 2 are provided vertically overlapping each other, and a coated felt 3 is bonded to the upper part of the fixing roll 1 located above.
The other end is immersed in a release agent storage tank 5 in which silicone oil 4 is stored.

Therefore, the silicone oil 4 is smoothly supplied from the release agent storage tank 5 to the fixing roll 1, but some of the applied silicone oil 4 that is not absorbed by the recording paper (not shown) during fixing is gradually removed. It moves downward and eventually turns into oil droplets and drips down.

Therefore, separate from the release agent storage tank 5, a separate container is required to receive the silicone oil 4 dropped.

The purpose of collecting silicone oil 4 in such a container is
This is to avoid contaminating the installation location of the device and to avoid wasting the recovered silicone oil 4 by reusing it.

Next, there is also something like the one shown in FIG.

That is, in the case of the type shown in FIG. 1, the release agent storage tank 5 is usually built into the fixing unit, and it is difficult to increase its capacity, so it must be frequently replenished.

Therefore, an oil tank 6 with a large capacity is provided, this oil tank 6 and the mold release agent storage tank 5 are connected by a pipe 7.8, and a pump 9 is provided in the supply side pipe 7 to feed the silicone oil 4. It is something that

Such a structure has the disadvantages of those shown in FIG. 1, and there is also a risk of oil leakage at the joint when the fixing unit is inserted or removed.

This idea allows for a simple structure in which the release agent can be collected while sufficiently supplying the release agent to the fixing roll, and there is no risk of the release agent spilling during collection, making it possible to create a fixing device for copying machines, etc. The purpose is to obtain.

With this idea, by providing a release agent storage tank at the bottom of the lowest roll of the roll fixing device, it is possible to collect the release agent dripping from the roll fixing device without having to provide a separate collection container. , which is constructed so that its structure can be made extremely simple.

A first embodiment of this invention will be explained based on FIGS. 3 to 5.

First, a heater 1 is installed inside the side plate 10 that surrounds the front, rear, left, and right sides.
A roll fixing device 14 is provided with a fixing roll 12 having a built-in fixing roller 1 and a pressure roll 13.

An oil application roll 15 is joined to the lower part of the fixing roll 12, and an oil supply roll 16 is joined to this oil application roll 15.

Below this oil supply roll 16, one end is provided with a bearing portion 1.
A biasing body 19 is rotatably held by a tension spring 18 and the other end is pulled up by a tension spring 18, and the oil pumping felt 20, whose center portion is held by the biasing body 19, pumps the oil with a predetermined pressure. It is joined to the supply roll 16.

The oil pumping felt 20 is suspended in a release agent storage tank 22 in which silicone oil 21, which is a release agent, is stored, and is immersed in the silicone oil 21.

The release agent storage tank 22 is made of a transparent member, and the remaining amount of the silicone oil 21 is checked through a cutout 23 formed in the side plate 10 for checking the remaining amount.

It is designed to be

Further, the mold release agent storage tank 22 is connected to the opposite side plate 1.
The shape is long enough to match the inner interval of 0, and a plurality of corrugated nail prevention plates 24 are formed in the middle part.

These corrugated nail prevention plates 24 have a kind of rib-like shape; gaps exist at their front and rear edges so that the silicone oil 21 can flow therethrough.

Further, an oil pan 25 that also serves as a guide plate is provided below the pressure roll 13, and the bottom of the oil pan 25 is connected to the release agent storage tank 22 through a pipe 26.

Furthermore, a cleaning blade 27 is attached to the periphery of the fixing roll 12 and a separation claw 28 is provided so that the recording paper 29 is separated and discharged by a conveying roller 30.

4 In such a configuration, when the fixing roll 12 rotates, the silicone oil 21 is supplied to its surface, and when the recording paper 29 passes, the silicone oil 21 moves to the recording paper 29 to prevent offset.

Surplus silicone oil 2 that did not transfer to this recording paper 29
1 is scraped off by the cleaning blade 27 and drips into the release agent storage tank 22, or it adheres to the pressure roll 13 and is collected from the oil pan 25 through the pipe 26 to the release agent storage tank 22 for reuse. Ru.

In addition, some oil drips from the edge of the lowest oil supply roll 16.

Further, the silicone oil 21 is supplied to the fixing roll 12 reliably and smoothly because the oil pumping felt 20 combs and lifts the silicone oil 21 at two locations.

However, if the whole unit is made into a unit, it may be moved by taking it in and out of the device, but in this case, since the release agent storage tank 22 has a corrugated nail prevention plate 24, a large amount of silicone oil 21 moves to one side. There will be no spillage.

Next, a second embodiment of this invention will be explained based on FIG.

In this embodiment, a mold release agent storage tank 22, which is larger than the interval between the side plates 10, is connected to the lower edge of the side plate 10 by a connecting shaft 31.

Therefore, even if the silicone oil 21 drips along the inner surface of the side plate 10, it can be completely recovered.

It should be noted that the roll fixing device 14 is not limited to a horizontal arrangement, but can of course be implemented in a vertical arrangement.

At this time, if the oil is pumped up from two places on the left and right, the supply effect will be more reliable.

As mentioned above, this device has a release agent storage tank that can be freely inserted and removed under the lowest roll of the fixing roll device to receive the release agent dripping from the roll fixing device. Surplus mold release agent can be collected without a container, and since there is a corrugated nail prevention board inside the mold release agent storage tank during collection, there is no risk of spillage due to shaking, and the structure is extremely simple. In addition, it can be made smaller if it is made into a unit.

[Brief explanation of the drawing]

Figure 1 is a vertical side view showing one conventional example, Figure 2 is a vertical side view showing another conventional example, Figure 3 is a vertical side view showing the first embodiment of this invention, and Figure 4 is its side view. FIG. 5 is a longitudinal sectional front view of a mold release agent storage tank, and FIG. 6 is a longitudinal sectional front view showing a second embodiment of this invention. 12... Fixing roll, 14... Reel fixing device, 1... Silicone oil (mold release agent), storage tank. 22...Release agent storage

Claims (1)

[Scope of utility model registration request] In a roll fixing device that applies a release agent to the fixing roll, an oil pan is fixedly provided at the bottom of the pressure roll to receive the release agent dripping, and is located at the lowest position on the side of the fixing roll. A fixing device for a copying machine, characterized in that a release agent storage tank is provided at the bottom of the roll to receive the release agent dripping from the roll fixing device and is provided with a corrugated nail prevention plate and can be taken in and taken out.