JPH0617788Y2 - Paper guide for transfer of wide paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a paper guide device for transferring an image from a photoconductor drum of a copying machine to a paper, and particularly, a large size paper is used as the photoconductor drum. The present invention relates to a guide device that improves the accuracy of the guide member itself in order to guide the paper and enables the paper to approach the photoconductor drum.

(Prior Art) In a device such as a relatively small copying machine, since the width of the paper is narrow, it is possible to transfer or
Even if only the paper guide means provided in a device such as a peeling corotron is used, the paper can be easily brought close to the photosensitive drum, and the toner image on the photosensitive drum can be easily transferred by discharge by the transfer corotron. Has been done.

On the other hand, in a large-sized copying machine for copying an image such as a drawing by using a wide paper such as A2 size, the paper is relatively small like tracing paper. Thin paper is often used, and a paper guide 20 as shown in FIG. 2 is used in order to make the paper evenly approach the photosensitive drum.

The paper guide shown in FIG.
1 is supported by 1 and is urged upward by a spring 22, and a support member for the paper guide is provided on the corotron rail 3 via a substantially L-shaped insulating bracket 25. I am trying to attach to 4.

Further, the paper guide 20 as described above is made of sheet metal, and as shown in FIG. 3, a plurality of support rods 2 attached to the lower part of the paper guide.
1 is attached to each of the insulating brackets, and when fixing the nuts 23 to the support rods, a mechanism is used that can adjust the distance between the paper guide and the photosensitive drum.

Then, the sheet discharged from the sheet feeding device of the copying machine is temporarily stopped by the registration roller 5, and the registration roller 5 conveys the sheet in the sheet conveyance path 6 with the leading end of the sheet regulated. The sheet is brought close to the photosensitive drum, and the toner image formed on the surface of the photosensitive drum 1 is transferred to the sheet by the discharge from the transfer corotron 2, and is conveyed by the conveying device 7 toward the fixing device. I have to.

(Problems to be Solved by the Invention) However, in the conventional device as described above,
Since the member forming the paper guide is a relatively thin sheet metal and the paper guide is relatively long, the bending of the paper guide in the length direction occurs, and the error in manufacturing the sheet guide made of sheet metal. And so on. Even when the paper guide is attached to the insulating bracket, it is very difficult to set the distance to the photoconductor drum to be the same even if the paper guide is supported by both end portions and the central portion. I have a problem.

Further, when the paper guide is attached to the copying machine, after the respective support rods are attached to the insulating brackets, the nuts 23 are used at the portions of the respective support rods and the surface of the photosensitive drum 1 and the paper. In order to set the distance A between the guide 20 and the tip of the drum side, it is necessary to perform a fine adjustment operation, and such an adjustment work is very troublesome and time-consuming. .

In addition, in the case of a conventional sheet guide made of sheet metal, since a phenomenon such as waviness of the sheet occurs, the distance A between the tip guide portion of the paper guide and the photosensitive drum is made extremely narrow, and the distance is about 1 mm. It is very difficult to get to.

If the distance between the paper guide and the photoconductor drum is not accurately set, the toner image is not properly transferred from the photoconductor drum to the paper in a high humidity or low humidity environment, and a high quality image is obtained. Problems such as not being able to make a copy occur.

(Object of the Invention) The present invention solves the above-mentioned drawbacks of the conventionally used apparatus, in which the paper guide is formed of an integrally molded T-shaped member, and the rigidity of the profile baffle is increased. It is an object of the present invention to provide a profile baffle that can be easily mounted on a copying machine without performing fine adjustment and the like.

(Means and Actions for Solving Problems) The wide paper transfer perm guide of the present invention forms a toner image on a photosensitive drum, and transfers the toner image to an image transfer portion of the photosensitive drum. By the discharge of the corotron,
In an apparatus configured to transfer to a paper, a profile baffle configured to integrally guide a paper as the paper is brought closer to the drum at an image transfer portion of the photosensitive drum is formed by an integrally formed T-shaped member. Then, the interval between the tip guide portion of the upper member of the integrally formed T-shaped member and the photosensitive drum is set to be small, and the leg member of the profile baffle is attached to the supporting member via an insulating means. The apparatus is configured as described above.

Therefore, in the device of the present invention, the profile baffle itself has a very high rigidity, and the profile baffle can be easily mounted by mounting the profile baffle on both ends of the profile baffle on the corotron rail. It is possible to set the tip guide portion of the profiled material baffle at an accurate interval with respect to the photosensitive drum.

Further, the profile baffle of the present invention can be directly attached to the corotron rail through an insulating member, and the number of the attaching members can be reduced and the attaching work can be easily performed. You can

(Embodiment) The construction of the paper guide for transfer of wide paper according to the present invention will be described with reference to the illustrated embodiment.

As shown in FIG. 1, in the copying machine of the present invention,
A profile baffle 10 is arranged as a paper guide for guiding the paper to the image transfer portion of the photosensitive drum 1. The profile baffle 10 is composed of an upper member 11 and a leg member 13, which are formed as an integrally molded T-shaped member. In addition, the profile baffle 1 of the present invention
0 is formed by integral molding of aluminum, and can be formed as a casting or an extruded member.

Then, in the profile baffle 10, the upper member 11
The photoconductor drum 1 side is formed as a tip guide portion 12, and the distance A between the tip guide portion 12 and the photoconductor drum 1 can be set to a predetermined value, for example, 1 mm.

The leg member 13 of the profile baffle 10 is configured as a member that performs the same action as an insulating bracket in a conventional paper guide, and is provided with a roller through a screw hole formed at a predetermined position of the leg member 13. It is configured to be fixed to the support member 4 of the tron rail 3 by a mounting screw 17. When attaching the profile baffle to the main body of the copying machine, an insulating film 15 is interposed in the contact portion between the supporting member 4 and the leg member 13, and the insulating spacer 16 is arranged with respect to the mounting screw 17. Then
It is designed to be able to exhibit insulation performance with the transfer and peeling corotron 2.

Further, in the paper guide for transfer of wide paper of the present invention, the profile baffle 10 is grounded, and a member having a predetermined resistance value is inserted between the profile baffle and the ground. , The profile baffle is prevented from being charged by the discharge from the transfer corotron.

The profile baffle 10 of the present invention is a member integrally molded of an aluminum alloy as described above.
It is possible to use FRP (plastic containing glass fiber) or any other material as long as it is a lightweight and rigid material.

With the configuration as described above, the rigidity of the profile baffle 10 can be set to be large, and the profile baffle has a very large strength in the lengthwise direction. A linear state and the entire structure of the profiled material baffle can be formed with arbitrary accuracy.

Therefore, when the profiled material baffle is fixed to the support member 4 of the transfer / release corotron 2, the profiled material baffle is attached by using the mounting screws 17 on both sides of the profiled material baffle. Only by adjusting the distance A with respect to 1, the mounting accuracy can be set satisfactorily.

Further, the profile baffle of the present invention can be made extremely strong in the lengthwise direction by forming each component member to have a thickness of about 4 to 5 mm, so that the A0 It can be installed in a very large copying machine, such as the one used for copying drawings of size, etc., and its length and irregular shape can be adjusted according to the width of the copyable paper in the copying machine. The sectional shape of the material baffle body can be arbitrarily set.

The profile baffle 1 of the present invention having the above structure
In the illustrated embodiment, 0 is fixed to the supporting member 4 of the corotron rail 3 with respect to the transfer / peeling corotron 2 provided in the image transfer portion of the photoconductor drum 1 and is fed from the paper feeding device. The paper is guided along the upper surface of the upper member 11, and while the paper is brought very close to the photosensitive drum 1 by the leading end guide portion 12, the image is transferred by the discharge by the transfer corotron.

In addition, the paper sent from the paper feeding device is the registration roller 5
The sheet is conveyed toward the image transfer portion through the sheet conveying path 6 in a state where the timing is synchronized with the rotation of the photoconductor drum, and the sheet on which the toner image is transferred as described above is conveyed. The apparatus 7 conveys the sheet toward the fixing apparatus, and the fixing apparatus performs the fixing operation to complete a copy.

In the above-mentioned apparatus of the present invention, an example is shown in which the paper guide is applied to a large-sized copying machine that makes a copy on a wide paper, but the profile baffle of the present invention has been described above. In addition to such a large-sized copying machine, it can also be used as a paper guide means in a general copying machine, and the length and sectional shape of the profile baffle can be arbitrarily formed according to the characteristics of the copying machine. You will be able to.

Further, the profile baffle of the present invention is not applied only when the photoconductor drum is used as the image forming member, and also in the image transfer portion of the device such as the belt-shaped photoconductor. It can be applied as the paper guiding means.

(Advantages of the Invention) Since the transfer paper guide for wide paper of the present invention has the above-mentioned configuration, it is possible to reduce the number of components and increase the rigidity. , Its configuration can be simplified.

In the apparatus of the present invention, as described above, the gap between the photoconductor drum and the leading end guide portion of the paper guide can be set to be small, so that when the water content of the paper is large, or
Even if the water content is low, the toner image can be satisfactorily transferred onto such paper.

Further, the profile baffle of the present invention can be easily installed when it is incorporated in the main body of the copying machine, and when it is fixed by the mounting screws at both ends of the member, the interval with respect to the photosensitive drum is set. By doing so, adjustments to other parts are not required, and fine adjustment work is unnecessary.

[Brief description of drawings]

FIG. 1 is a side view showing the structure of a paper guide for transfer of wide paper according to the present invention, FIG. 2 is a side view showing the structure of a conventional device, and FIG. 3 is an insulating bracket for a conventional paper guide. It is a front view which shows the relationship with. Reference numeral 1 in the figure: 1 photosensitive drum, 2 transfer and peeling corotron, 3
...... Corotron rail, 4 ...... Support member, 5 ...... Register roller, 7 ...... Conveying device, 10 ...... Profile material baffle, 11
...... Upper member, 12 ...... Tip guide, 13 ...... Leg member, 1
5 ... Film, 16 ... Insulating spacer, 17 ... Mounting screw, 20 ... Paper guide, 21 ... Support rod, 22 ... Spring, 25 ... Insulating bracket.

Claims (1)

[Scope of utility model registration request] 1. An apparatus configured to form a toner image on a photosensitive drum, and transfer the toner image onto a sheet by discharging a transfer corotron provided in an image transfer portion of the photosensitive drum. In the image transfer portion of the body drum, a deformable material baffle for guiding the paper so as to approach the drum is formed of an integrally molded T-shaped member, and the tip of the upper member of the integrally molded T-shaped member. A paper for transfer of wide paper, characterized in that the distance between the guide portion and the photosensitive drum is set to be narrow, and the leg members of the deformed material baffle are attached to the supporting member via insulating means. guide.