JPH0345232Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a copying device equipped with a conveyance mechanism capable of copying business cards or business card-sized paper.

[Conventional technology]

FIG. 6 shows a copying machine equipped with a conventional transport mechanism of this type. In the figure, 1 is an electrostatic image carrier;
2 and 2' are paper feed rollers. The paper feed roller 2,
2' communicates with a path 3 for sheets taken out one by one from a cassette (not shown) and a path 4' for sheets loaded from a manual feed table 4, respectively. A paper path 5 communicates the paper feed rollers 2, 2' with the lower surface of the electrostatic image carrier 1, and the paper path 5 includes a lower guide plate 5a and an upper guide plate 5b. At one side edge in the width direction of the paper path 5, a conveyance means 6 is provided for supplying a business card or business card-sized paper (hereinafter referred to as a business card, etc.) to the electrostatic image carrier 1. The conveyance means 6 for carrying business cards, etc. includes a drive roller 8 provided so as to be retractable into the paper path 5 through a through hole 7 provided in the lower guide plate 5a, and a through hole 9 provided in the upper guide plate 5b.
The through hole 9 is rotatably supported on the distal end of a mounting plate 10 having spring properties whose base end is fixed to the rear edge side.
A non-conductive roller 11 made of a non-conductive material such as polyacetal resin is provided, which is made of a non-conductive material such as polyacetal resin and rotates as a result of being in pressure contact with the drive roller 8 through the roller.

In addition, in the figure, 12 is a transfer section, and 13 is a discharge mechanism.

In the above configuration, the means 6 for transporting business cards, etc. is installed close to the electrostatic image carrier 1 because it is necessary to ensure that the business cards, etc. come into contact with the electrostatic image carrier 1, and furthermore, the means 6 for transporting business cards, etc. The conductive roller 11 is easily charged with static electricity due to friction during conveyance, and as it is attracted to the electrostatic image carrier 1 and is carried, it absorbs some of the developer powder and becomes dirty. There was a problem in that it adhered in a band shape to the copy surface, degrading the copy image quality.

[Purpose of invention]

This invention is intended to solve the above-mentioned problem, and aims to provide a copying apparatus in which developer powder is not adsorbed to the non-conductive roller.

[Structure of the idea]

In order to achieve the above object, this invention includes a paper feed roller upstream of the electrostatic image carrier, and is close to the electrostatic image carrier on the upper and lower guide plates that communicate the electrostatic image carrier and the paper feed roller. A business card or business card consisting of a drive roller protruding above the lower guide plate, and a non-conductive roller that is held in pressure contact with the upper surface of the drive roller held by the upper guide plate via a mounting plate and rotates as a result. In a copying machine equipped with a small paper conveying means for supplying large and small paper sheets to a transfer unit, electric discharge is caused to occur on the surface of the non-conductive roller over almost the entire axial direction of the non-conductive roller. A conductive member made of a metal plate is arranged so that a plurality of protrusions are close to each other, or a conductive member made of a brush is provided in light contact with the surface of the non-conductive roller to remove static electricity. By this,
The structure is such that static electricity generated on the surface of the non-conductive roller can be reliably eliminated.

〔Example〕

Next, this invention will be explained based on the embodiments shown in FIGS. 1 to 5. Note that the same parts as in FIG. 6 are indicated by the same reference numerals.

20 is placed in close proximity to the electrostatic image carrier 1 and is placed close to one side of the non-conductive roller 11 by bringing its end close to or in slight contact with the non-conductive roller 11 over almost the entire axial direction of the non-conductive roller 11. It is a conductive member that discharges or eliminates static electricity. Representative examples of the conductive member 20 and its attachment means are shown in FIGS. 2 to 5.

FIG. 2 shows a metal plate 21 made of a conductive material such as aluminum or phosphor bronze as a conductive member 20 provided with a plurality of protrusions in a sawtooth shape at one end.
1' is on one side of the non-conductive roller 11,
It is fixed to the mounting plate 10 so as to be close to it over almost the entire axial direction, and is grounded. Therefore, the static electricity charged on the non-conductive roller 11 is discharged between it and the serrated edge 21' of the metal plate 21 as close as possible to the non-conductive roller 11, and the static electricity is eliminated.

FIG. 3 shows a case where the brush ends of the interdigital brushes 22 formed of a conductive material as the conductive member 20 are brought into light contact over almost the entire axial direction of one side surface of the non-conductive roller 11. It is. In this case, the base end of the brush 22 is fixed to the mounting plate 10 by pivotally supporting the non-conductive roller 11, and is grounded. Therefore, the static electricity generated on the non-conductive roller 11 is temporarily eliminated through the brush 22 that comes into contact with the non-conductive roller 11.

In FIG. 4, the mounting plate 10 itself, which pivotally supports the non-conductive roller 11 as a conductive member 20, is formed of a conductive material, and a plurality of protrusions are formed on the edge of the mounting hole 10' of the non-conductive roller 11. It is provided in a sawtooth shape and configured so that electric discharge occurs between the sawtooth end 23 and the non-conductive roller 11.

FIG. 5 shows a rotating brush 24 made of a conductive material as a conductive member 20, and a rotating brush 24 formed of a conductive material on a non-conductive roller 11.
The outer peripheral end portion of the non-conductive roller 11 is pivotally supported in the mounting hole 10' of the mounting plate 10, in which the non-conductive roller 11 is in light contact over almost the entire axial area of one side surface. Therefore, the static electricity generated on the non-conductive roller 11 is temporarily eliminated through the rotating brush 24 that comes into contact with the non-conductive roller 11.

In the above embodiment, the non-conductive roller 11 is disposed close to one edge of the electrostatic image carrier 1 in the axial direction, and the end of the conductive member 20 is connected to one side of the non-conductive roller 11. The case where they are in close or light contact over almost the entire axial direction is shown.
For example, the length of the non-conductive roller 11 in the axial direction may be the same as the length of the electrostatic image carrier 1 in the axial direction, and the conductive member 20 may be brought close to or lightly in contact with the entire area thereof. Also good.

Further, the conductive member 20 and its attachment means shown in the above embodiments are not limited to these, and it goes without saying that any other aspects or configuration means may be included.

[Effect of idea]

As described above, this invention includes a paper feed roller upstream of the electrostatic image carrier, and a paper feed roller located close to the electrostatic image carrier on the upper and lower guide plates that communicate the electrostatic image carrier and the paper feed roller. , a business card or a small size business card comprising a drive roller protruding above the lower guide plate, and a non-conductive roller held in the upper guide plate via a mounting plate and rotated in pressure contact with the upper surface of the drive roller. In a copying apparatus equipped with a small paper conveyance means for supplying paper to a transfer section, a plurality of electrical discharges are provided to cause discharge to occur on the surface of the non-conductive roller over almost the entire axial direction of the non-conductive roller. A conductive member made of a metal plate is arranged so that the protrusions are close to each other, or a conductive member made of a brush for eliminating static electricity is provided in light contact with the surface of the non-conductive roller. Because of this feature, static electricity that builds up on a non-conductive roller close to the electrostatic image carrier due to friction when transporting business cards, etc., is erased by the conductive member, and the static electricity is absorbed and carried by the electrostatic image carrier. There is no risk that part of the developer powder that has arrived will be attracted to the non-conductive roller and become dirty. Therefore, the developer powder sucked by the non-conductive roller does not appear in a strip on the copy surface of a business card or the like as in the conventional method, and a good quality copy image can always be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the copying apparatus of this invention, FIG. 2 is a perspective view of the main parts showing the manner in which the conductive member is installed, FIGS. 3 to 5 are plan views showing other embodiments, and FIG.
The figure is a sectional view of a conventional copying apparatus. 1... Electrostatic image carrier, 2, 2'... Paper feed roller,
5...Paper path, 5a...Lower guide plate, 5b...
Upper guide plate, 6... Conveying means for business cards, etc., 7, 9...
...Through hole, 8...Drive roller, 10...Mounting plate, 1
1... Non-conductive roller, 20... Conductive member, 2
1...Metal plate, 21', 23...Sawtooth end, 22...
...Brush-shaped brush, 24...Rotating brush.

Claims (1)

[Claim for Utility Model Registration] A paper feed roller is provided upstream of the electrostatic image carrier, and a position close to the electrostatic image carrier on the upper and lower guide plates that communicate the electrostatic image carrier and the paper feed roller. A business card or a business card-sized roller comprising a drive roller protruding onto the lower guide plate, and a non-conductive roller held in the upper guide plate via a mounting plate and rotated in pressure contact with the upper surface of the drive roller. In a copying apparatus equipped with a small paper conveyance means for supplying small paper to a transfer section, a method for causing discharge to occur on the surface of the non-conductive roller over almost the entire axial direction of the non-conductive roller is provided. A conductive member made of a metal plate is arranged so that a plurality of protrusions are close to each other, or a conductive member made of a brush for static elimination is provided in light contact with the surface of the non-conductive roller. A copying device characterized by: