JPH06118827A - Fixing device for copying machine - Google Patents

Abstract

PURPOSE:To prevent the staining of a copied image, the wrinkles of paper and paper jamming by wiping out waterdrops caused by dew condensation on respective rolls by the use of a waterdrop absorbing member while rotating the respective rolls being a guiding member in a feeding direction. CONSTITUTION:At least the lower side guiding member 10b out of the upper and the lower guiding members 10a and 10b which lead to an ejecting roll 7 from a fixing roll 1 and a pressure roll 2 and guide copying paper is constituted of plural rolls 11a, 11b, 11c.... The waterdrop absorbing member 12 such as felt is brought into contact with the lower sides of the respective rolls 11a, 11b and 11C. Then, the respective rolls 11a, 11b and 11c are rotated in the feeding direction, and the copying paper is smoothly fed to the ejecting roll 7 side from the rolls 1 and 2. At this time, even when the dew condensation is caused on the respective rolls 11a, 11b and 11c, the waterdrops are wiped out by the member 12 being in contact with the rolls 11a, 11b and 11c, so that it is prevented from sticking to the copying paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device of a copying machine for heating and fixing a toner image transferred on a copy sheet.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a conventional fixing device. In FIG. 1, reference numeral 1 is a fixing roll having a heating device incorporated therein, and 2 is a pressure roll for press-contacting the fixing roll. By passing the copy paper 3, the toner image 4 transferred onto the copy paper 3 is heated and melted and fixed. Peeling claws 5a and 5b are provided on the downstream side of the rolls 1 and 2 in the rotational direction, and the copy paper 3 is peeled from the rolls 1 and 2 by the claws 5a and 5b. There is. After that, the copy sheet 3 is guided to a pair of vertically opposed sheet discharging guide members 6a and 6b, which are configured in a plate shape, and is sent to the discharge roll 7 side.

[0003]

In the conventional fixing device as described above, the copy sheet 3 passing through the pair of fixing rolls is used.
Since the sheet-shaped guide members 6a and 6b are used as guides, the water evaporated from the copy sheet 3 during the heat fixing process tends to cause dew condensation on the guide members 6a and 6b. When dew condensation occurs on the guide members 6a and 6b, the dew condensation adheres to the copy sheet 3 passing through the guide members 6a and 6b, and the copy image is contaminated, paper is jammed, and paper wrinkles occur.

Conventionally, the shape of the guide members 6a and 6b has been devised to reduce the heat capacity of the guide members 6a and 6b and to provide an air flow path to prevent the dew condensation phenomenon from occurring, but it is too large. The effect was not obtained. Dew condensation on the guide members 6a and 6b was remarkable when the temperature of the guide members 6a and 6b was low immediately after the power of the copying machine main body was turned on.

The present invention has been made in view of the above, and even if dew condensation occurs on the guide member for guiding the copy sheet from the fixing device to the discharge roll, the dew does not adhere to the copy sheet. An object of the present invention is to provide a fixing device for a copying machine that can eliminate the problems.

[0006]

In order to achieve the above object, the fixing device of the copying machine according to the present invention includes upper and lower guide members 10a and 10b for guiding the copying paper 3 from the fixing device to the discharge roll 7. At least the lower guide member 10
b is composed of a plurality of rolls 11a, 11b, 11c, ... Which can be rotationally driven in the feeding direction of the copy sheet 3, and the water droplet absorbing member 12 is brought into contact with each of the rolls 11a, 11b, 11c ,. It has been configured.

[0007]

[Operation] When the copy sheet 3 is conveyed from the fixing device, the rolls 11a, 11b of the guide members 10a, 10b,
11c, ... are rotated in the feed direction, during which each roll 1
The water droplet absorbing member 12 wipes off water droplets generated by dew condensation on 1a, 11b, 11c, ....

[0008]

EXAMPLE An example of the present invention will be described with reference to FIG. In this embodiment, the same members as those of the prior art shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. At least the lower guide member 1 of the upper and lower guide members 10a and 10b that guide the copy sheet 3 from the fixing roll 1 and the pressure roll 2 to the discharge roll 7 of the fixing device.
0b is composed of a plurality of rolls 11a, 11b, 11c, .... Each roll is rotatably supported, and a gear or sprocket (not shown) is fixed to one end of each roll 11a, 11b, 11c, ... It is driven to rotate in the direction in which the copy sheet 3 is fed.

A water droplet absorbing member 12 such as a felt is in contact with the lower side of each of the rolls 11a, 11b, 11c ... The shapes of the rolls 11a, 11b, 11c ...
A round bar as shown in (a), or a shape in which spheres are linked together as shown in FIG. 3 (b) can be considered.

In the above structure, the rolls 11a, 11 of the lower guide member 10b are actuated when the copy sheet 3 is fixed.
, b, 11c, ... Rotate in the feeding direction to smoothly eject the copy paper 3 from the fixing roll 1 and the pressure roll 2
Sent to the side. At this time, the rolls 11a, 11
Even if dew condensation occurs on b, 11c, ..., It is wiped off by the water droplet absorbing member 12 in contact therewith, and this does not adhere to the copy paper 3.

In the above embodiment, the guide member 10
A humidity sensor may be provided in the vicinity of b, and whether or not dew condensation occurs may be detected by this humidity sensor, and each roll may be rotated as necessary to wipe off the dew condensation. The upper guide member 10a may also have the same structure as the lower guide member 10a.

[0014]

According to the present invention, the guide members 10a, 10 for guiding the copy sheet 3 from the fixing device to the discharge roll 7 are provided.
Even if dew forms on the copy sheet b, it does not adhere to the copy sheet 3, and it is possible to prevent stains on the copy image due to the attachment of water droplets on the copy sheet 3, paper wrinkles, paper jams, and the like.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing a conventional example.

FIG. 2 is a schematic configuration explanatory view showing an embodiment of the present invention.

3 (a) and 3 (b) are perspective views showing shape examples of rolls having different guide members.

[Explanation of symbols]

1 ... Fusing roll, 2 ... Pressure roll, 3 ... Copy paper, 4 ...
Toner image, 5a, 5b ... Separation claw, 7 ... Ejection roll, 10
a, 10b ... Guide member, 11a, 11b, 11c, ...
Roll, 12 ... Water drop absorbing member.

Claims (1)

[Claims] 1. Copy paper 3 from fixing device to discharge roll 7
At least the lower guide member 10b of the upper and lower guide members 10a, 10b for guiding the conveyance of the plurality of rolls 11a, 11 capable of being rotationally driven in the feeding direction of the copy sheet 3.
b, 11c, ... and each roll 11
A fixing device for a copying machine, wherein a water drop absorbing member 12 is brought into contact with a, 11b, 11c, ....