JPH052512Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to an elastic synthetic resin sheet for an image forming device, and in particular to an elastic synthetic resin sheet for an image forming device that is attached to a guide plate for an image forming device to guide the image forming paper to a photosensitive drum for transfer, thereby preventing poor transfer of the image forming paper.

[Conventional technology]

Generally, in an image forming apparatus, for example, a copying machine, as shown in FIG. It is configured to transfer paper P. In order to perform this transfer process, registration rollers 4 and 5 for supplying the copy paper P to the transfer section 7 and a guide plate are provided.

This guide plate is composed of a lower guide plate 2 and an upper guide plate 3 for guiding the copy paper P onto the photosensitive drum 6.

In such guide plates 2 and 3, the image forming paper P fed from the registration rollers 4 and 5 is guided by the guide plates 2 and 3.

By the way, since the guide plates 2 and 3 are relatively hard, they inherently have their own rigidity. .
There is a phenomenon in which the image forming paper P bounces when moving toward the upper guide plate 3, and the vibrations at this time are transmitted from the upper guide plate 3 to the transfer section 7, resulting in a transfer failure of the image forming paper P.

As a measure to eliminate such inconvenience, an elastic synthetic resin sheet 1 having a uniform thickness is pasted on the lower guide plate 2.

This elastic synthetic resin sheet 1 is thin and has elasticity, and has a stiffness smaller than that of the guide plates 2 and 3, so that it absorbs the stiffness and softens.

Therefore, when the rear end of the copy paper P guided by the guide plates 2 and 3 comes off the registration rollers 4 and 5, the image forming paper P is moved by the elastic synthetic resin sheet 1 stuck to the guide plate 2. , the rigidity of the lower guide plate 2 is prevented from being directly transmitted to the image forming paper P, and the image forming paper P is no longer pushed by the lower guide plate 2, and as a result, the image forming paper P
This prevents the rear end from jumping up and prevents vibration from transferring to the transfer section 7.
Since the transfer is not transmitted to the image forming paper P, defective transfer of the image forming paper P does not occur.

[The problem that the idea aims to solve]

By the way, from the registration rollers 4 and 5 to the guide plate 2,
3, the elastic synthetic resin sheet 1 as described above is attached to the lower guide plate 2, and the image forming paper P
If the image forming paper P is guided over the elastic synthetic resin sheet 1, the bouncing phenomenon of the rear end of the image forming paper P can be prevented.

However, when the image forming paper P is guided over the elastic synthetic resin sheet 1 and comes off the tip of the elastic synthetic resin sheet 1 facing the photoreceptor drum 6, the elastic synthetic resin sheet 1 and the transfer corona discharger 8 Since there is a gap between them, the rear end of the image forming paper P suddenly falls downward.

By the way, since the image forming paper P is in contact with the photoreceptor drum 4 at the transfer section 7, a sudden downward drop of the rear end of the image forming paper P is transmitted to the transfer section 7 as vibration, causing a transfer failure. It was hot.

[Means to solve the problem]

Therefore, this invention is an elastic synthetic resin sheet for an image forming apparatus, which is attached to a guide plate provided between the photosensitive drum and a registration roller for guiding image-forming paper to the photosensitive drum for transfer, and which protrudes toward the photosensitive drum, and which is characterized in that this elastic synthetic resin sheet has a number of holes or recesses formed in the tip portion facing the photosensitive drum, from the registration roller side toward the photosensitive drum side, thereby reducing the inherent rigidity of the elastic synthetic resin sheet.

The purpose is to provide a means to solve the above problems.

[Effect]

In the above configuration, the elastic synthetic resin sheet has a large number of holes or recesses formed in the tip facing the photoreceptor drum from the registration roller side to the photoreceptor drum side, Since the rigidity is reduced, the supporting force of the elastic synthetic resin sheet to support the image forming paper is reduced.

When the image-forming paper is conveyed to the protruding portion of the elastic synthetic resin sheet, the elastic synthetic resin sheet is gradually displaced downward due to the weight of the image-forming paper. Since the distance that the forming paper falls downward becomes smaller, the image forming paper falls gently from the elastic synthetic resin sheet.

〔Example〕

Hereinafter, how the configuration of the present invention is actually implemented will be explained along with its operation. FIG. 1 is a perspective view of the elastic synthetic resin sheet of the present invention adhered to a guide plate, and 1 in the figure is the elastic synthetic resin sheet 1. This elastic synthetic resin sheet 1 has a substantially rectangular shape, and has a photosensitive drum 6 on the side opposite to the side 1a facing the registration rollers 4 and 5 (FIG. 4).
A large number of holes 1c are formed in parallel in the tip end 1b facing the , and as shown in FIG. In some cases, the diameter of the hole is gradually increased from the registration roller side toward the photosensitive drum side, as shown in FIG.

Furthermore, instead of the hole 1c, a large number of recesses 1d may be formed as shown in FIG. 4.

The tip end 1b of the guide plate 2 is bored through the guide plate 2 and bonded to the guide plate 2 with an adhesive.

Since a large number of holes 1c or recesses 1d are thus provided at the tip of the elastic synthetic resin sheet 1, the tip 1b has reduced rigidity and becomes soft.

When the image forming paper P is sent onto the elastic synthetic resin sheet 1 from the registration rollers 4 and 5 (Fig. 4), the image forming paper P is guided from the registration roller side 1b to the photosensitive drum side 1c and is smoothly transferred. sent to the department.

In this case, the tip of the elastic synthetic resin sheet 1 is 1
In b, due to the formation of a large number of holes 1c or recesses 1d, the inherent rigidity of the elastic synthetic resin sheet 1 is reduced.

As a result, the supporting force of the elastic synthetic resin sheet 1 supporting the image forming paper P gradually decreases.

Then, while the image forming paper P is guided and conveyed on the elastic synthetic resin sheet 1 from the registration roller 1b side to the photosensitive drum side 1c, the supporting force is gradually reduced.

The image forming paper P is an elastic synthetic resin sheet 1.
When the elastic synthetic resin sheet 1 is conveyed to the protruding part, the elastic synthetic resin sheet 1 is gradually displaced downward due to the weight of the image forming paper P, so that the elastic synthetic resin sheet 1
Since the distance that the image-forming paper P falls downward from the image-forming paper P becomes smaller, the image-forming paper P falls gently from the elastic synthetic resin sheet 1, and as a result, vibration to the transfer section 7 can be prevented and image defects will not occur.

[Effect of idea]

According to the above-mentioned invention, an elastic synthetic resin sheet for an image forming device is attached to a guide plate provided between a registration roller and a photosensitive drum, protruding toward the photosensitive drum, and a number of holes or recesses are formed in the tip of this elastic synthetic resin sheet facing the photosensitive drum to reduce its rigidity. Therefore, the supporting force of the elastic synthetic resin sheet that supports the image forming paper while the image forming paper is transported on the elastic synthetic resin sheet is reduced, and when the image forming paper is transported to the protruding part of the elastic synthetic resin sheet, the elastic synthetic resin sheet is gradually displaced downward by the weight of the image forming paper, so that the distance that the image forming paper falls downward from the elastic synthetic resin sheet is reduced. As a result, vibration to the transfer section can be prevented, and no image defects will occur.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the elastic synthetic resin sheet of the present invention adhered to a guide plate, Figs. 2 and 3 are examples of the elastic synthetic resin sheet, and Fig. 4 is an example of the elastic synthetic resin sheet. FIG. 5 is a back view of another embodiment, and is an explanatory view of the main parts of a copying machine equipped with a conventional elastic synthetic resin sheet. 1... Elastic synthetic resin sheet, 1a... Resist side of elastic synthetic resin sheet, 1b... Tip end of elastic synthetic resin sheet, 1c... Air hole, recess,
2, 3... Information board, 4, 5... Registration roller,
6...Photosensitive drum, 7...Transfer section.

Claims (1)

[Scope of utility model registration request] An elastic composite for image forming apparatuses that is attached to a guide plate provided between a registration roller and the photoreceptor drum for guiding the image forming paper to the photoreceptor drum in order to protrude toward the photoreceptor drum. This elastic synthetic resin sheet is a resin sheet.
A large number of holes or recesses are formed in the portion protruding from the guide plate from the registration roller side toward the photoreceptor drum side, thereby reducing the inherent rigidity of the elastic synthetic resin sheet. An elastic synthetic resin sheet for image forming devices.