JPS60125870A - Separating device for copy paper - Google Patents

Abstract

PURPOSE:To stabilize copy paper separation without spoiling transfer performance by providing a forcible separating means at one side end of a separating device and an electrostatic separating means which is weakened in output at the opposite side of a corona discharger adjacently to the forcible separating means. CONSTITUTION:The transfer paper separating device is equipped with the forcible separating part 5 which has a separation roller 3 and a separation roll 4 and the separation charger which adjoins to the separation part 5 and is provided in parallel to a transfer charger. A corona wire 13 is fitted at a position (h) lower than a normal fitting position (i) at a nonforcible separation side end part and thus put away from a photosensitive body to weaken a corona current, decreasing the destaticizing efficiency of copy paper. Therefore, one side end of the fed copy paper is separated strongly by the forcible separating part 5 and the other side end is separated from the photosensitive body by weakening its force of electrostaic attraction to the photosensitive body by the destaticizing of a charger 6. The destaticizing efficiency of the nonforcible separation side is low, so no failure in transfer due to the over destaticizing of this part is caused.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a copy paper separation device for separating copy paper after transfer from a photoreceptor in a copying machine.

2. Description of the Related Art Generally, in powder image transfer type copying machines, forced separation using a separation tape and electrostatic separation using corona discharge are known as methods for peeling copy paper from a photoreceptor after transfer.

The former forced separation is performed using a separation tape (2), a separation roller (3), and a separation roller (4) provided adjacent to one end of the image forming area of the photoreceptor (1), as shown in FIG. In the forced separation section (5) having (1)
The copy paper fT+ is forcibly peeled off from the photoreceptor (1) by clamping the - side edge of the copy paper fT) which is electrostatically attracted and conveyed by the photoreceptor (1). However, as shown in Fig. 2, when a wide width copying paper (T') is used, since the copying paper (TO) has a large contact area with the photoreceptor (1), the forced separation part (5) side is Photoreceptor (1) that is separated or difficult to separate on the other side
The photoreceptor was conveyed while being adsorbed to the photoreceptor, causing breakage near the forced separation section (5) and even wrapping around the photoreceptor (1). Furthermore, even if the copy paper is not wrapped, the leading edge of the copy paper shakes significantly, which may cause the transferred, unfixed toner image to be distorted. In addition, when the humidity is low, as shown in Fig. 1, the electrostatic attraction force with the photoreceptor (1) is strong even in the case of a copy paper (1) that is not wide (Tl), Similar to when used, separation failure is likely to occur.

On the other hand, the latter type of electrostatic separation due to corona discharge, although a reactionary separation occurs at room temperature and low humidity, it tends to cause poor separation when it is very humid, and also often causes poor separation when copying paper is thin paper with low rigidity. was waking up.

BACKGROUND OF THE INVENTION Therefore, the inventors of the present invention focused on using both forced separation and electrostatic separation, and as shown in FIGS. The following experiment was conducted to confirm the separation performance of an apparatus in which a separation charger (6) for carrying out this process was installed in parallel with the photoreceptor (1).

That is, an Se-based photoreceptor (1) with a diameter of 120+ym is charged to 650V with a battery charger (7), imagewise exposed to form an electrostatic latent image, and then developed with a developing device (8) to form a toner image. shall be. The toner image is transferred by the transfer charger (10) onto the copy paper that is being fed at the timing by the timing roller (9) so as to be synchronized with the toner image on the photoreceptor (1).In this way, Tonneau - The copy paper on which the image has been transferred is transferred to a forced separation section (5) and a separation charger (6).
It is peeled off from the photoreceptor (1) by corona discharge. At this time, the output of the transfer charger (10) is 5.31 (V,
The copy paper is 526A3 size with vertical grain and is fed horizontally, and the environmental conditions are temperature 308C and humidity 10%.

Under the above conditions, the output of the separation charger (6) was varied and the separability and transferability thereof were investigated, and the results shown in Table 1 below were obtained.

Table 1 ×...Poor ○...Good
) When the output was Q KV rms, as shown in FIG. 2, the copy paper wrapped around the photoreceptor (1) and some parts of it became frayed. Output?3. For Q KV rms,
Either the separation was carried out or the side of the copy paper that was not forcibly separated was undulated and came into contact with the cleaning device (11), and the transferred image was disturbed. If the output is 3.5 KV rms or more,
The side of the copy paper that was not forcibly separated was well separated without large waves, and it was recognized that the effect was due to the combined use of forced separation and electrostatic separation. However, when looking at the transferability, as shown in FIG. 5, a defective transfer area (A) of more than 10 meters was formed on the side of the copy paper that was not forcibly separated, and it was not suitable for practical use.

From the above experimental results, it was confirmed that simply using forced separation and electrostatic separation in combination improves separation performance, but causes a new problem of deterioration in transferability.

Regarding the cause of the above-mentioned problem, the inventors believe that because the separation of the opposite side of the copy paper from the forced separation side tends to be delayed compared to the forced separation side, excessive charge removal by the separation charger (6) occurs, and the transfer It is assumed that the toner that was once transferred to the copy paper by the charger (10) is re-transferred to the photoreceptor (1), causing a transfer failure.

Purpose The present invention has been made in view of the above points, and its purpose is to provide a separation device that uses forced separation and electrostatic separation in combination and is capable of stably separating copy sheets without impairing transferability. It is provided by.

SUMMARY In order to achieve the above object, a separation device according to the present invention is provided adjacent to one end of an image forming area of a photoreceptor in a separation device for peeling copy paper on which a toner image has been transferred from a photoreceptor. A forced separation means using a separation tape, and an output on the side opposite to the side where the forced separation means is provided, which is adjacent to the forced separation means and is provided along the axial direction of the photoreceptor, and where the forced separation means is provided. The gist of the present invention is to include an electrostatic separation means using a corona discharger whose output is weaker than that of the side being exposed.

Its basic configuration is almost the same as that already shown in FIGS. 3 and 4. That is, as shown in FIG. 6, there is a forced separation section (5) having a separation roller (3), a separation roller (4), etc., and a section adjacent to the forced separation section (5) and parallel to the transfer charger (10). Separate charger installed in (
6). In this separation charger (6), an insulating member is attached to the charger opening near the end on the opposite side (referred to as the non-forced separation side) to the side where the forced separation section (5) is provided (referred to as the forced separation side t). A regulating plate (12) is provided. For example, acrylic, polypropylene, etc. are suitable as the insulating member. This regulation plate (12) regulates the ion flow between the separation charger (6) and the photoreceptor () during corona discharge, and reduces the static elimination efficiency of the copy paper passing through this part. As shown in FIGS. 7 to 10, the configuration includes a forced separation section (5) and a separation charger (6
) The corona wire (13) is arranged so as to turn from the forced separation side to the non-forced separation side and gradually move away from the photoreceptor.

Specifically, as shown in FIGS. 7 and 8, the corona wire (13) of the separation charger (6) is installed at the end of the separation charger (6) in the normal mounting position (vertically below il in the paper passing direction). Or, as shown in Figure 9 and ml l 0, the corona wire (13)
is attached at a position fjl that is upstream in the paper passing direction from the normal attachment position fkl at the forced separation side end, while it is mounted at a position fjl that is upstream in the paper passing direction from the normal attachment position fkl at the non-forced separation side end. It is attached at position Ip), which is in the downstream direction of.

Furthermore, the entire separation charger (6) can be attached to the photoreceptor (1) without changing the mounting position of the corona wire (13) itself.
It may also be provided at an angle to the surface.

In this way, on the non-forced separation side, the corona-to-wire (13) is moved away from the photoreceptor (1), thereby weakening the corona current and reducing the efficiency of neutralizing the copy paper.

6 to 10, that is, the configuration in which the minute wire (13) is arranged so as to be inclined so as to gradually move away from the photoreceptor from the forced separation side to the non-forced separation side. When a copy sheet is passed through the copy paper under the lower part, one side edge of the copy paper is forcibly separated from the photoreceptor force by the forced separation part (5), while all tracks except the negative side edge are separated by the separation charger (6). ), the electrostatic attraction force to the photoconductor (1) is weakened, and the copy paper is peeled off from the photoconductor (1) due to the rigidity of the copy paper itself and the tensile force from the forced separation section (5). At this time,
On the non-forced separation side, the separation will be delayed compared to the forced separation side, and the time required to remove the static electricity by the AIF charger (6) will be longer, or as described above, the removal on the non-forced separation side ( As described above, the separation device according to the present invention separates the copy paper on which the toner image has been transferred from the photoreceptor. In a separation device for peeling, a forced separation means using a separation tape provided adjacent to one end of an image forming area of a photoreceptor; and electrostatic separation means using a corona discharger whose output on the side opposite to the side where the separation means is provided is weaker than the output on the side where the forced separation means is provided. This enables stable separation of copy paper without impairing transferability.

Experimental Example In the configuration using the regulating plate (12) shown in FIG. 6, the total length of the charger opening for AC corona discharge is 4
Using the 3041m separate charger (6), the regulation plate (1
2) The length is 130 m, the width is 7 l shoulder, the output of the transfer charger (10) is 6.31 cv, the vertical grain is 52 wrinkles, A3 size paper is fed horizontally, and the environmental conditions are 30° temperature. C. Assuming 10% humidity, the separate charger (6)
The results shown in Table 2 were obtained as a result of examining the separability and transferability by varying the output.

Table 2 ×...Poor ○...Good As is clear from the above table, the separation and transfer properties were good in the range of the output of the separation charger (6) from 375 to 4.25 KV rms. .

In addition, in FIG. 6, the same result can be obtained even if the regulating plate (12) is provided on the first stream of the paper passing direction of the charger opening of the separation charger (6), or on the opposite side, downstream in the paper passing direction. It was done.

Next, in the configuration in which the corona wire (13) shown in FIGS. 7 and 8 is inclined in the vertical direction of the paper passing direction, the attachment position (11) of the corona wire (13) at the end on the non-forced separation side is
Except that the output voltage of the separate charger (6) was set to 3.75 KV rmS, which gave good results in the experiment described in 1.
As a result of examining the separability and transferability under the same conditions as described above,
Good results were obtained in both cases.

Furthermore, the corona wire (1
3) In the configuration where the corona wire (13) at the end on the forced separation side is tilted in the paper passing direction, the mounting position (i) of the corona wire (13) at the end on the forced separation side is set to the normal mounting position (l, 5 mIn paper passing direction, 1 second flow). On the other hand, the separability and transferability were investigated under the same conditions as above, except that the attachment position @ (p) of the non-forced separation side end was changed from the normal attachment position + m) to the paper feeding direction for 15 minutes. As a result, good results were obtained in both cases.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the prior art, Figures 3 and 4
The figure shows a separation device using both forced separation means and electrostatic separation means, FIG. 5 shows the drawbacks thereof, and FIG. 6 shows a top view of the first configuration of the separation device according to the present invention. 7 to 10 show the second configuration, FIG. 7 is a side view of the separation device, FIG. 8 is a sectional view at the flat curve P in FIG. 7,
FIG. 9 is a top view of the separation device, and FIG. 10 is a sectional view at the flat curve P in FIG. 9. 1. Photoconductor 2 Separation tape 3 Separation roller 4 Separation roller 5 Forced separation section 6. Separation charger 12 Regulation plate
13... Corona wire applicant Minolta Camera Co., Ltd. No. 1 @ Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] l In a separating device for peeling copy paper on which a toner image has been transferred from a photoreceptor, a forced separation means using a separation chip provided adjacent to one end of an image forming area of the photoreceptor;
A device that is adjacent to the forced separation means and is provided along the axial direction of the photoreceptor, and the output on the side opposite to the side where the forced separation means is provided is weaker than the output on the side where the forced separation means is provided. 1. A copy paper separating device comprising: electrostatic separating means using a corona discharger. 2□ The corona discharger is characterized in that a regulating member for suppressing corona discharge is provided in the charger opening near the end opposite to the side where the forced separation means is provided. Copy paper amount stated in item 1 + i + Ii'
,Device. 3. A special feature characterized in that the corona wire of the corona discharger is arranged at an angle so as to gradually move away from the photoreceptor from the side where the forced separation means is provided to the opposite side. , i'r A copy paper separating apparatus according to claim 1.