JPS62237480A - Copying paper carrying device - Google Patents

Abstract

PURPOSE:To prevent a toner from sticking to the lower face of a cleaning device, by constituting at least the lower face of a part which has been separated from the side where a separating means has been provided, of the cleaning device provided on the upper part of a copying paper guide member positioned between a photosensitive drum and a fixing device, of a conductive material which has been grounded. CONSTITUTION:The end edge part of copying paper 2 which has been peeled off forcibly by a separating belt 4 from the surface of a photosensitive drum 1 is led as it is to a carrying roller 14, therefore, the copying paper can be carried smoothly toward a fixing device 15 by a carrying roller 13. Accordingly, it can be prevented effectively that a toner which has been transferred to the copying paper 2 is attracted to a cleaning device 17. Also, the end edge part of the opposite side to the separating belt, of the copying paper 2 is carried in a state that it is adjacent to the cleaning device 17, but it is in a state that an electrostatic attraction force is not operated, since a conductive body 18 is grounded, and it can be prevented effectively that the toner which has been transferred to the copying paper 2 is adsorbed to the conductive body 18.

Description

[Detailed Description of the Invention] 189th Industrial First> This invention relates to a copy paper conveying device, and more specifically, the present invention relates to a copy paper conveying device, and more specifically, a copy paper conveying device that separates copy paper by a separating means provided at one end of a photoreceptor drum. The present invention relates to a copy paper transport device that transports copy paper toward a fixed "I!" device.

<Prior Art> Conventionally, copying machines have been widely used in which a toner image is formed on the surface of a photoreceptor drum, the toner image is transferred onto copy paper, and then guided to a constant W device to fix the toner image. In such a copying machine, a method using a separation charger and a method using a separation belt are used to separate the copy paper from the photoreceptor drum.

Among the above methods, the separation method using a separation belt attaches the separation belt so as to be in contact with the surface of one end of the photoreceptor drum. The remaining portion on the other side is peeled off due to the stiffness of the copy paper itself.

Therefore, when copying paper with weak stiffness or wide width is used, on the side where forced separation is performed by the separation belt, as shown in FIG. J' J: The transfer charger (31) is now transferring the toner image! After ζ, remove the separation belt (3
2), the copy paper (33) is peeled off from the photoreceptor drum (34), guided along the upper surface of the copy paper guide member (36) by the conveyance roller (35), and the copy paper guide δ11 material is removed. Before being guided to (36), static charges are removed by a static eliminating brush (37). Then, on the side where forced separation by the separation belt is not performed, as shown in FIG. 7, after the copy paper (33) moves upward following the photosensitive drum (34), the photosensitive drum (34) and is peeled off from the copy paper guide portion 44 (3).
8).

In addition to the above configuration, there is also a configuration in which an electrode to which a bias voltage of 2 to 4 KV is supplied is provided on the bottom surface of the cleaning device! (Refer to Publication No. 59-125764).

<Problems to be Solved by the Invention> In the copy paper conveying device having the configuration shown in FIGS. 6 and 7 above, since static charges are considerably removed through the defrosting brush (37), ), separation belt (3
2), until the leading edge of the copy paper comes into contact with the copy paper guide member 1 (36), it is in a state where it is walled up considerably above the copy paper guide member (36), and the leading edge of the copy paper touches the copy paper guide member (36). 36), the bond gradually descends, but the trailing edge of the copy paper is flipped upward, toner adheres to the bottom surface of the cleaning HIM (38), and the toner is transferred to the leading edge of the next copy paper. There is a problem in that the particles adhere to the paper and deteriorate the quality of the copied image. Furthermore, when installed in a small copying machine, the leading edge of the copy paper (33) comes close to the bottom surface of the cleaning device (38), so that an electrostatic attraction force is created between it and the cleaning device (38). acts,
A part of the toner transferred by the transfer charge t (31) is adsorbed to the lower surface of the cleaning device (38), and when the adsorption level reaches a predetermined value ff1 or more, it is adsorbed to the subsequent copy paper (33) or the copy paper There is a problem of falling onto the guide member (36).

In the case of the copy paper conveying device (J3) having the structure shown in the above-mentioned No. 11 [1, 1977-125764, the adsorption of toner can be prevented by the voltage of 2 to 4 KV applied to the electrodes. Since the applied voltage is a high voltage, a transformer or the like is required to apply the high voltage, resulting in a problem that the configuration becomes complicated.

<Object of the invention> This invention was made in view of the above problems,
It is an object of the present invention to provide a copy paper conveying device that can reliably prevent toner from adhering to the bottom surface of a cleaning device with a simple configuration.

Means for Solving the Problems> In order to achieve the above object, a copy paper conveying device of the present invention is provided above a copy paper guide member located between a photosensitive drum and a fixing device. The lower surface of at least the portion of the cleaning device spaced apart from the side where the separating means is provided is constructed of a grounded '24 electric body.

However, a defrosting brush is disposed at the end of the photosensitive drum side of the copy paper guide member that protrudes more upwardly on the side where the separation means is provided and less protrudes upwardly on the opposite side. Good too.

With the copy paper conveying device configured as described above, when the copy paper is separated by the separation means provided at one end of the photoreceptor drum and conveyed toward the fixing device, the separation belt side is static-eliminating. The copy paper is placed along the upper surface of the copy paper guide member in a state where the electricity is removed by the brush.

In addition, the side opposite to the separation belt is φj away from the photoreceptor drum at a position considerably above the copy paper guide portion and approaches the bottom surface of the cleaning device, but it is located at a bottom surface spaced apart from the separation means side of the cleaning device. Localization Iil￥
(The position where the copy paper is weak and closest to the cleaning device) is made of a conductor, and the NjJTa body is grounded, so there is no electrostatic attraction between it and the conductor. Therefore, the toner of the copy hermit is not attracted to the conductor.

Further, if a static elimination brush is disposed at the end of the copy paper guide member on the photoconductor drum side, the amount of upward protrusion is large on the side where the separation means is provided, and the amount of upward protrusion is small on the opposite side,
Is the trailing edge of the copy paper cleaning Kl? ? It is possible to prevent 11+IJ from getting too close to the bottom surface of the 11+IJ.

<Example> Hereinafter, a detailed explanation will be given with reference to the attached four drawings showing examples. .

FIG. 1 shows an embodiment of the copy paper conveying device of the present invention.
j is a perspective view showing a photoreceptor drum (1) and a fixing device (1);
5) A copy paper guide member (3) that conveys the copy paper (2) toward (see FIGS. 2 and 3) and a separation belt (that separates the copy paper (21) from the photoreceptor drum (1).
4), a static elimination brush (5) attached to the photoreceptor drum side of the copy paper guide member (3), and a photoreceptor drum (1).
) for guiding the copy paper (2) peeled off from the guide member (
6), a cleaning device (17) (see FIGS. 2 and 3), and a conductor (18) (see FIG. 3).

To explain in more detail, the photoreceptor drum (1) is
A transfer charge V (8) for transferring a toner image from a photosensitive drum (11 to copy paper (2)) is disposed at a predetermined position on three supporting parts U (71) rotatably supported. At the same time, a cleaning Hffi (17) is provided to collect toner remaining on the surface of the photoreceptor drum (1). (A separation belt (4) is provided that forcibly separates one end edge of 21.

The cleaning vilt (17) has a casing (19) made of synthetic resin or the like, and a cleaning blade (20) made of an elastic body. (4)
A conductor (18) is attached to the end farthest from the paper (for example, closer to the end than the vertical feed width of 85-size copy paper), and the conductor (18) is grounded.

The shape of the conductor (18) is a casing (
A flat plate shape with a width that covers the bottom surface of the photoreceptor drum (19) and projects toward the photoreceptor drum (1) is adopted.

The copy paper guide member (3) has a plating layer formed on the surface of a metal base (9) made of iron or the like, and
Lips (11) extending in the conveyance direction are formed at predetermined intervals on the copy paper conveyance surface. Then, the static elimination brush (5) is directly connected to the metal base (9) by screws or the like with the plating layer ω peeled off from the photosensitive drum side end of the copy paper guide portion 44 (31), and is grounded. ) are provided. Furthermore, a conveyance roller (13) is disposed at a predetermined position of the copy paper guide section 44 (33) for applying a conveyance force to the copy paper (21) peeled off from the photoreceptor drum (1) by the separation belt (4). It is set up.

The guide member (6) is disposed between the photoreceptor drum (1) and the static elimination brush (5), and guides the plate material (6') having an arcuate upper surface in a direction perpendicular to the conveyance direction. A plurality of guide members (6) are arranged in parallel to each other.
A conveyance roller (14) is disposed on the extension of the separation belt (4) to apply conveyance force to the portion separated by the separation belt (4).

The operation of the copy paper conveying device having the above configuration is as follows.

The edge of the copy paper (2) forcibly peeled off from the surface of the photosensitive drum (1) by the separation bell l-f4+ is guided directly to the conveyance roller (14) as shown in FIG. , the long conductive linear body (5') of the static eliminating brush (5) contacts the upper surface of the copy paper guide member (3) from the beginning, and immediately before contacting the copy paper guide member (3), the static charge is considerably removed. Since the copy paper is removed, it is in a state where it is adsorbed to the copy paper guide member (3), and the adsorption force is not too large, and the paper is transported toward the fixing device [(15) by the transport roller (13). It can be done smoothly. In other words, the copy paper +21 is in a state where almost no electrostatic adsorption force is applied between it and the cleaning device (17), and the toner transferred to the copy paper (21) is transferred to the cleaning device 8@(17).
It can effectively prevent the product from being adsorbed to the surface.

Further, as shown in FIG. 3, the edge of the copy paper (2) on the side opposite to the separation belt (4) is
), but the conductor (
18) is grounded, so no electrostatic attraction force is applied, effectively preventing the toner transferred to the copy paper (2) from being attracted to the 5# electric body (18). can do.

When actually performing a copying operation, the conductor (18
), the bottom surface of the casing (19) turned black after copying several tens of sheets, and a considerable amount of toner was observed to be adsorbed, whereas the conductor (18)
With the casing (19) and the conductor (18) attached, even if several hundred copies are made, the bottom surface of the casing (19) and the bottom surface of the conductor (18) will not turn black, effectively preventing toner adsorption. Admitted.

Therefore, the next copy paper (21) was not contaminated with toner, and a high quality copy image could be obtained.

FIG. 4 and FIG. 5 are views of other embodiments, and the difference from the above embodiment is that the static elimination brush (5) is made of a long conductive wire with half of the separation belt side. (5'), and the remaining half has short-length conductive linear bodies (5~); the other parts are the same as those of the above example. is the same as

Therefore, in this embodiment, copy paper (21,
As shown in Fig. 5, the edge on the opposite side of the separation belt (4) directly faces the short conductive linear body (5) of the static elimination brush (5), so that only a small amount of static charge is removed. Moreover, since the plating layer (g) on the surface of the copy paper guide member (3) is only incompletely grounded, the synergistic effect of the electrostatic adsorption force and the stiffness of the copy paper (21) causes the copy paper to move almost upward. Without being guided, the copy paper can be smoothly conveyed toward the fixing device (15) while being adsorbed to the upper surface of the copy paper guide member (3).

Therefore, it is possible to prevent the splash of the rear end of the copy paper ('2J) and the scattering of toner caused by the splash, and it is possible to more reliably prevent toner from adhering to the lower surface of the casing (19). It is also possible to prevent skew feeding of copy paper ('2J).

In addition, since the electrostatic adhesion force between the copy paper (2) and the copy paper guide section 41 [31] is not very large, the copy paper cannot be copied at the portion where the toner 7 image is transferred by the transfer charger (8). It is possible to reliably prevent the inconvenience of peeling off the paper (2+) from the photoreceptor drum (1).

Note that the present invention is not limited to the above-mentioned embodiments. For example, the shape of the conductor (18) may be changed by cleaning
The shape should follow the lower surface of the casing (19) of the ffi (17) and the side surface on the photosensitive drum side, and
) can be attached over the entire width of the casing (19), the casing (19) can be made of a conductor and can be grounded, and various other modifications can be made within the scope of the present invention without changing the gist of the invention. It is possible to do so without going through the history of establishment and change.

<Effects of the Invention> As described above, the present invention allows toner to be adsorbed to the bottom surface of the cleaning device even when the copy paper is conveyed with the side that is not forcibly peeled off by the separation belt close to the cleaning device. Qin has the unique effect of being able to reliably prevent this.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the copy paper conveying device of the present invention, FIG. 2 is a view showing a portion where forced separation is performed by a separation belt, and FIG. FIG. 4 is a perspective view showing another embodiment; FIG. 5 is a diagram showing a portion where forced separation by a separation belt is not performed; FIG. 6; FIG. 7 shows a conventional example. (1)...Photosensitive drum, (2)...Copy paper, (3
)... Copy paper guide member, (4)... Separation belt,
(15)...Fixing device, (17)...Cleaning device, (18)...Conductor, (19)...Casing special applicant Sanda Kogyo Co., Ltd.

Claims (1)

[Claims] 1. Separation provided at one end of the photoreceptor drum The fixing device peels off the copy paper by means of to the copy paper transport device that transports the between the photoreceptor drum and the fixing device. Arranged above the copy paper guide member located of cleaning equipment that has been cleaned at least The bottom surface of the part separated from the side where the separation means is installed consists of a grounded conductor A copy paper conveyance device characterized by the following. 2. Photosensitive drum side of copy paper guide member At the end, the amount of upward protrusion on the side where the separation means is installed is Static neutralization with a large amount of electricity and a small amount of upward protrusion on the opposite side The above features are equipped with brushes. Copy paper conveyance device according to claim 1 Place.