JPH04170567A - Paper separation device in picture forming device - Google Patents

Abstract

PURPOSE:To prevent a ripple from its generation in discharged recording paper by providing a recording paper guide roller in the vicinity of an exfoliating pawl. CONSTITUTION:Recording paper P, when it is fed between a heating roller 1 and a pressing roller 2, pressed and heated to pass between both rollers 1, 2, is exfoliated from the heating roller 1 by a point end of an exfoliating pawl 7. The recording paper P, exfoliated from the heating roller 1, is guided by a recording paper guide roller 11, immediately after exfoliation, to a paper discharge passage between a pair of upper and lower recording paper guides 3, 4. The recording paper is discharged by paper discharge rollers 5, 6. In this way, the recording paper P is guided to the paper discharge passage between a pair of the upper and lower recording paper guides 3, 4 with no deflection after the recording paper is separated from the heating roller 1, so that a ripple is prevented from its generation in the discharged recording paper P.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a paper peeling device in an image forming apparatus such as an electrophotographic copying machine.

[Prior Art] In an electrophotographic copying machine, a toner image is fixed on a recording paper by heating and pressing the recording paper on which a toner image is formed using a heating roller and a pressure roller.

The recording paper that has passed between the heating roller and the pressure roller is peeled off from the heating roller by a peeling claw, sent to a paper discharge path between a pair of upper and lower recording paper guides, and discharged through the paper discharge passage.

[Problems to be Solved by the Invention] If you look closely at the recording paper discharged as described above, you will notice that the recording paper may be wavy.

The reason for this is that there is a large space between the time the recording paper passes between the recording paper heating roller and the pressure roller, is peeled off by the peeling claw, and the time it is sent to the paper ejection path between the pair of upper and lower recording paper guides. This is thought to be due to the

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper peeling device for an image forming apparatus that does not cause waviness in ejected recording paper.

[Means for Solving the Problems] A paper peeling device in an image forming apparatus according to the present invention has the following features:
A recording paper guide roller that guides the recording paper peeled from the fixing heating roller by the peeling claw to a paper ejection path is provided near the peeling claw that peels the recording paper from the fixing heating roller. [Operation of the Invention] When the recording paper is peeled off from the fixing heating roller by the peeling claw, the recording paper guide roller provided near the peeling claw guides the recording paper into the paper discharge path in the form of a recording paper.

[Embodiments] Hereinafter, embodiments in which the present invention is applied to an electrophotographic copying machine will be described with reference to the drawings.

In the following explanation, "front" refers to the front in the recording paper conveyance direction, that is, the left side in FIG. 1, "rear" refers to the rear in the recording paper conveyance direction, that is, the right side in FIG. What is the second
The upper side of the figure is referred to as the upper side of the figure.

In FIGS. 1 and 2, a fixing section of an electrophotographic copying machine is provided with a heating roller 1 and a pressure roller 2 that pinch a recording paper P sent to the fixing section. In front of these rollers 1.2, a pair of upper and lower recording paper guides 3.4 forming a paper discharge path are arranged. At the front end of the recording paper guide 3.4, a pair of upper and lower discharge rollers 5.6 for discharging the recording paper P are provided.

A peeling claw 7 for peeling the recording paper P from the heating roller 1 is provided in front of the heating roller 1 . The peeling claw 7 is rotatably supported by a support shaft 8 extending in the left-right direction and supported at both ends by the copying machine main body frame (not shown).
A plurality of sets of two are provided at intervals in the length direction of the support shaft 8. Each peeling claw 7 is biased by a spring (not shown) so that its tip comes into pressure contact with the outer peripheral surface of the heating roller 1.

A long hole 9 is formed in each peeling claw 7, and a rotating shaft 10 passes through the long hole 9 of each peeling claw 7. This rotating shaft 10 is rotatably supported by a copying machine main body frame (not shown). Further, this rotating shaft 10 is connected to a rotational drive device (not shown) for the heating roller 1 and the pressure roller 2 via a transmission mechanism.

A recording paper guide roller 11 is fixed to this rotating shaft 10 in an open position of a pair of peeling claws 7 of each group. The position and size of the elongated hole 9 of each peeling claw 7 is such that the peeling claw 7 is
It is formed so that even if it swings slightly around the center, it will not interfere with the rotating shaft 10 or the peeling claw 7.

When the recording paper P is sent to the fixing section, the rotating shaft 10 is rotationally driven. The rotating shaft 10 is rotated at such a speed that the circumferential speed of the recording paper guide roller 11 is equal to the circumferential speed of the heating roller 1 (pressure roller 2).

The recording paper P is fed between the heating roller 1 and the pressure roller 2, is pressurized and heated, and when it passes between both rollers 1.2, it is removed by the tip of the stripping claw 7, as shown in FIG. The recording paper P is peeled off from the heating roller 1.

As shown in FIG. 3, the recording paper P peeled off from the heating roller 1 is immediately guided by a recording paper guide roller 11 after being peeled off, and is guided to a paper discharge path between a pair of upper and lower recording paper guides 3.4. Ru. Then, the paper is ejected by the ejection roller 5.6.

According to this embodiment, the recording paper P that has passed between the heating roller 1 and the pressure roller 2 and is peeled off from the heating roller 1 by the peeling claw 7 is immediately moved to the recording paper guide roller 1 after being peeled off.
The paper is guided to a paper discharge path between a pair of upper and lower recording paper guides 3 and 4. Therefore, after the recording paper P is peeled off from the heating roller 1, it is guided to the paper ejection path between the pair of upper and lower recording paper guides 3 and 4 without being bent, so that the ejected recording paper P is undulated. I won't.

[Effects of the Invention] According to the present invention, when the recording paper is peeled off from the fixing heating roller by the peeling claw, the recording paper is immediately guided to the paper ejection path by the recording paper guide roller provided near the peeling claw. Therefore, the ejected recording paper will not be undulated.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram showing the vicinity of the fixing section, FIG. 2 is an enlarged plan view showing a peeling claw and a recording paper guide roller, and FIG. 3 is a diagram showing the peeled recording paper. FIG. 2 is a diagram corresponding to FIG. 1 showing how a recording paper is guided to a paper discharge path by a recording paper guide roller. 1...Heating roller, 7...Peeling claw, 11-0. Recording paper guide roller, 3.4... Recording paper guide. that's all

Claims (1)

[Claims] (1) Image formation in which a recording paper guide roller is provided near a peeling pawl that peels the recording paper from the fixing heating roller, and guiding the recording paper peeled from the fixing heating roller by the peeling pawl to a paper ejection path. Paper peeling device in the device.