JPS5824176A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent an overlapped toner adhering phenomenon due to adhering matter, by providing a means for cleaning a toner separating pawl. CONSTITUTION:When a plunger 9 is electrically conducted by a means 13, a plate spring member 8 is drawn upward, and a separating pawl 6 is rotated clockwise and is detached form a heating roller 1. In this case, adhering matter 7 which has adhered onto a side surface 61 of the separating pawl 6 is detached from the separating pawl as a sharp tip part of a peel-off part 10 slides on the side surface 61. Accordingly, an overlapped toner adhering phenomenon due to adhering matter is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a member that contacts a support material that supports a toner image;
For example, an image forming apparatus Kll having a separation means provided in a fixing device.

Conventionally, in a fixing device using this off-roller, a pair of rollers is lightly pressed and a sharp-tipped separation claw or the like is provided to ensure separation from the owner and prevent the roller from getting caught in the roller. Various methods have been proposed and implemented to reduce the jam rate. However, in a heat roller fixing device, etc., the toner on top of the W immediately after being carried out is still melted, and this melted soot comes into contact with the surface of the separating claw and adheres to the separating claw. However, the tip of the separation claw was lifted off the roller, reducing the separation effect. It is known that the separation claw is made of a material such as Teflon to prevent the material from being easily offset, but even so, after copying a large number of sheets, it is difficult to completely remove the material from the edge of the separation claw. It was impossible to prevent this. It also has the effect of cleaning toner stains on the separating claw and fixing row 20, and this cleaning action also causes the thinner to adhere to the tip of the separating claw, making it easy to offset.

FIG. 1 shows the configuration of a generally widely used heat roller fixing and separation claw device.

1.2 is 2 pairs of heating rows, 1-21 is clockwise, -122
1 shows a state in which the sheet is rotated counterclockwise and the toner image is fixed on the sheet. 3 is a recording sheet, 4 is unfixed toner, and 5 is a toner image fixed on the recording sheet.

Reference numeral 6 denotes a separation claw which is pressed against the roller by a spring or the like (not shown).

Figure 2 is an enlarged view of the tip of the separating claw after copying a large number of sheets, and shows the state in which toner adheres to the tip of the separating claw 6 and offsets and separates from the fixing roller. . In this manner, the separation effect of the separation claw 6 is significantly reduced due to the offset of the roller 70, resulting in the separation into the lawn or separation failure.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problem and provides an image forming apparatus having a separating means that can exhibit a nearly perfect separating effect over a long period of time.

FIG. 6 shows an embodiment of the present invention, in which reference numeral 6 indicates a zero separation claw for separating the sheet from the heating roller 1, reference numeral 8 indicates a plate spring member for separating the separation claw 6 from the heating roller 1, and reference numeral 9 indicates a plate spring member 8.
12 nozzles to drive, 10 heated by a peeling member--2
10 Separation claw 6 moved away from the surface by one turn and moved to the position indicated by the broken line
This is to scrape off toner, etc. that has adhered to the tip of the blade.

When the plunger 9 is energized by the means 15 for giving a signal to the plunger shown in 9, the leaf spring member 8 is pulled upward, the separation claw 6 rotates clockwise, and the heat roller 1
depart from. At this time, the tip of the separating claw 6 comes into contact with the peeling member 10, and the toner adhering to the piece 11iK is scraped off. FIG. 4 shows an enlarged view of the state at this time.

FIG. 4 is a diagram showing a place where the tip of the separating claw 6 is exposed to the peeling member 1 of C, and the toner that has adhered or fallen on the surface is scraped off. As shown in FIG. 6, the adhered matter 7 due to toner or paper powder, etc., which has adhered and hardened or is offset in the f11 direction 61 of the separating claw that contacts the toner support surface, is removed by the sharp tip of the peeling member 1o. By sliding on the top, it is released from the separating claw.

A spring 15 is attached to this peeling member 10,
The elastic force of the spring 150 initially holds the peeling material 1° at a position where the tip of the peeling member 1o comes into contact with the side surface 61 of the separation claw 10, and the cleaning is done! Sometimes tIlrkJ section 61
After removing the deposit 7, the tip of the separating claw should be i
It can be moved to a position where it comes into contact with the side surface portion 101. Therefore, the separation claw 1o is 8m6 from its tip.
There will be enough leaning over 1.0
After the cleaning of the separation claw 10 is completed, the plunger 15 is used to remove the separation member 10 from metal, plastic or other materials. In addition, in order to avoid damaging the separating claws 6, it is preferable that they are made of a softer material than the separating claws 6, and it is also preferable that there is not much difference in hardness between them. preferable.

When the separation claw 6 is coated with a tear layer, it is preferable to use fluororubber, silicone rubber, or a metal plate coated with a rubber coating layer.

FIG. 5 shows another embodiment of the present invention, in which a peeling member is attached to a support shaft 11 made of an elastic body and its tip, and a foil-like peeling member is provided with nine sharp parts at positions opposite to separation claws 60WJ6z and 6m. It is characterized by being constructed by the member 12. Plunger 9 As in the example, the separation claw 6 rotates clockwise (arrow A). First, the side surface 61 of the separating claw comes into contact with the foil-like member 12, and the deposit 7 caused by the adhered toner is scraped off. At this time, since the support shaft 111 that fixes the foil-like member 12 is an elastic body, the separating claw 6 moves upward beyond the peeling member (indicated by a dotted line). When the plunger 9 is de-energized by a signal, the separating claw is moved by the repulsive force of a spring (not shown) pressing the separating claw 6 against the fixing roller or by the repulsive force of a spring or the like provided on the plunger 9. 6 moves in the direction of arrow B, and the foil member 12 also comes into contact with the other side surface 61 of the separating claw 6 to scrape off the adhered toner.

Therefore, the separation claw 6 is sufficiently cleaned and separation performance can be maintained for a long period of time.

As mentioned above, after the separation claw 6 passes the support shaft 11, the signal to cut off the current to the plunger 90 is as follows.
In this embodiment, the protrusion 111 provided on the support shaft 11 comes into contact with the separation claw 6 when it passes through! This may be done using the electronic switch 14. The signal from the i-microsystem 14 is sent to means 15 having the function of cutting off the power supply to the 12 engine 9. This means 15 has a delay circuit that delays the signal of the microswitch 14, and the plunger 9 is energized until the surface 6a of the separating claw 6 is located above the foil member 12 (dotted line in the figure). is configured to delay the generation of the signal that cuts off the signal.

If the above embodiment is followed, as shown in Figure 6.4,
It is possible to remove the deposits at the tip of the separating claw and prevent the phenomenon of redundant toner adhesion caused by the deposits.

Furthermore, by separating the separation claw 6 from the heat roller 2,
It also has the effect of preventing the temperature rise of the separating claw 6 and preventing toner from adhering to it. In addition, the second embodiment (Fig. 5)
As shown in FIG.
It is also possible to obtain the effect of scraping off 6 m of adhered toner. As a result, it is possible to provide an apparatus such as a copying machine using a heat-lowering 2-fixing device that is free from jams due to toner adhering to the tip of the separating claw.

In the above embodiments, the present invention has been explained using an example of an image forming apparatus using heat roller fixing.
It can also be applied to an image forming apparatus using IK.

The present invention is applicable to all embodiments that can be configured for the purpose of cleaning separation claws.

[Brief explanation of the drawing]

Fig. 1 is an fIArfJ diagram of a conventional heat-ro 2 fixing device consisting of a heating o-9 pair and a separation claw, Fig. m2 is an enlarged view of the separation claw part, and Fig. 6 is a side view of an embodiment of the present invention. Fig. 4 is an enlarged view of the main part of Fig. 3, gg5 is an enlarged view of the main part of another embodiment of the present invention 0 1.20.@e 2 pairs of heating rows, 6@... separation claw, 9
・・・・・・Plunger, 10＠・-Removal member, 1
2 m@@*@ foil-like member agent circle 1hIII -n 1, [cicada and ゛1

Claims (1)

[Claims] An image forming apparatus comprising: a separating means for separating a support material supporting a thin image from a member in contact with the support material; and a means for cleaning the wrinkle separating means.