JPS61257846A - Picture forming device - Google Patents

Abstract

PURPOSE:To avoid to accumulate electric charge generated on sheets while they are fed, by contacting a conductive member furnished at the part of a sheet feeding cassette to the earth at the installing member of the device body. CONSTITUTION:At the installing member 16 of the device body where a feeding cassette 2 is installed, the earth 17 is furnished to which are connected the lower ends of screws 15, 15 to fix a bottom plate guide 12. While sheets are fed, a feeding roller 3 is rotated and sheets in the cassette case 9 are picked up one by one, when, a friction between the picked up sheets and the lower side sheets contacting the picked up sheets generates an electric charge, and accumulates it by repeating operations at a bottom plate 11. However, the charge escapes to the earth 17 through the screws 15, 15 of the bottom plate guide 12, making the charge of the bottom plate 11 equal to that of the earth 17. Therefore, no discharge occurs, and any error operation of the control circuit, misfeeding, and the like are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus used, for example, as an electronic copying machine.

[Technical background of the invention and its problems]

Generally, a secondary copier is equipped with a paper feed cassette in its main body.
Feed paper from this paper cassette.

The image formed on the photoreceptor is transferred onto this paper.

By the way, the above-mentioned paper feed cassette usually stores a large number of sheets of paper in a stacked state, and is taken out and fed one by one one by one. Electric charge is generated between the paper and the paper.

However, in the past, when sheets were continuously pulled out, charges were accumulated on the sheets that were not pulled out, and when the amount exceeded a certain level, discharge development occurred. As a result, the control circuit of the copying machine malfunctioned.
Lt gave the operator a shock. There were many inconveniences such as not being able to feed the last sheet of paper.

[Purpose of the invention]

The present invention has been made in view of the above circumstances.

The object thereof is to provide an image forming apparatus that does not allow the accumulation of charges generated between sheets during sheet feeding.

[Summary of the invention]

In order to achieve the above object, the present invention provides a conductive part in at least a part of the paper feed cassette, and brings the conductive part into contact with the ground part of the attachment part of the main body of the apparatus, thereby reducing the electric charge generated between the sheets. It is designed so that it can escape from the earth part.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. In the figure, reference numeral 1 denotes a main body of an electronic copying machine, and a paper feed cassette 2 is detachably provided at the lower part of one side of the main body 1. The paper feed cassette 2 accommodates sheets P, and the sheets P are taken out one by one by the rotation of the paper feed roller 3. This removed paper P is the main body 1
After the image is transferred onto the photosensitive drum 4 by a transfer charger 5, it is peeled off by a peeling charger 6.

This peeled paper P is sent to the fixing roller 7, where the transferred image is fixed, and then discharged to the paper discharge tray 8.

By the way, the cassette case 9 of the paper feed cassette 2 is molded from plastic, the surface of which is coated with a conductive IE paint, and a spring 10.1 is installed inside.
A bottom plate 11 is provided which is supported in an inclined state by 0.

This bottom plate 11 is supported at its both sides by bottom plate guides 12.degree. 12, which together with screws 15.degree. 15, which will be described later, constitute a conductive section. Slide holes 13 are perforated in the vertical direction in the side surfaces of these bottom plate guides 12.12, and protrusions 14° 14 protruding from both ends of the bottom plate 1 are inserted into these slide holes 13.13 for upper and lower sides. Supported for free movement. The bottom plate guides 12, 12 are fixed to the cassette case 9 by screws 15, 15.

Further, as shown in FIG. 4, a grounding portion 17 is provided in the mounting portion 16 of the apparatus main body 1 to which the paper feed cassette 2 is attached, and this grounding portion 11 is provided with the bottom plate guide 12.12.
The lower ends of the screws 15° 15 that secure the are in contact.

During paper feeding, the paper feeding roller 3 is rotated and the papers P in the cassette case 9 are taken out one by one.
At this time, the paper P being taken out and the paper P on the lower side that is in contact with it rub against each other, causing electrical charge, which is continued),! ! Load is accumulated on the bottom plate 11. However, this charge is released to the ground portion 17 via the bottom plate guide 12 and the screws 15, 15, and the bottom plate 11 is
becomes the same potential as

As described above, according to this embodiment, no charge is accumulated on the bottom plate 11, and no discharge development occurs. Therefore, it is necessary to reliably prevent accidents such as malfunctioning of the control circuit in the main body 1, electric shock to the operator, or misfeeding of paper, as in the conventional case.
can.

In the above embodiment, the rim material was applied to the surface of the paper feed cassette 2, but the present invention is not limited to this.
The paper feed cassette may be made of conductive plastic having a resistance of 10!1 l-crIL or less.

Other 1 It goes without saying that the present invention can be modified in various ways within the scope of the gist.

〔Effect of the invention〕

As explained above, in the present invention, at least a part of the paper feed cassette is provided with a conductive part, and this conductive part is brought into contact with the ground part of the main body of the apparatus, so that when paper is fed, charging occurs due to friction between the sheets. This can also be released from the ground.

Therefore, unlike in the prior art, charges are not accumulated and the control circuit of one image forming apparatus malfunctions.

This has the effect of reliably preventing electric shocks to the operator or paper feeding errors.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention, in which Figure 1 is a partially cutaway front view of an electronic copying machine, Figure 2 is a side sectional view of a paper feed cassette, and Figure 3 is a perspective view thereof. , FIG. 4 is a configuration diagram showing the installed state. DESCRIPTION OF SYMBOLS 1...Device body, 17...Grounding part, 16...Mounting part, 11...Bottom plate (conductive part), 15, 15...Screw (conductive part), 2...Paper feed cassette , P...Paper. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (4)

[Claims] (1) A device main body, a mounting section provided on the device main body and having a grounding section, and a paper feed cassette that is attached to the mounting section and has a conductive section that contacts the grounding section at least in part and supplies paper. An image forming apparatus comprising: (2) The image forming apparatus according to claim 1, wherein the paper feed cassette is molded from a synthetic resin material and has its surface coated with conductive paint. (3) The image forming apparatus according to claim 1, wherein the paper feed cassette is molded from a conductive synthetic resin material. (4) The image forming apparatus according to claim 2 or 3, wherein the synthetic resin material is a plastic material.