JPS6048836A - Sheet feed tray - Google Patents

Abstract

PURPOSE:To prevent a waterdrop from adhering to a sheet and to avoid a failure in feeding out a sheet on a feed tray by bringing the paper surface of a moistureproof thin plate formed by sticking moistureproof material such as vinyl to a paper sheet into contact with the surface of a sheet in the sheet feed tray. CONSTITUTION:A moistureproof thin plate 3 formed by stacking in layers moistureproof material 3a such as vinyl, metal or the like and a paper sheet 3b is disposed in such a manner that the paper sheet 3b layer is brought into contact with the surface 2a of a sheet 2 stored in a sheet feed tray 1. In this arrangement, a waterdrop is prevented from adhering to the sheet, which can attain good running performance for a sheet on the sheet feed tray.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper supply tray for cut sheets in image forming apparatuses such as electrophotographic copying machines, various copying machines such as micro printers, and printing machines.

Prior Art For example, cut sheets used in copying machines or microprinters are transfer paper or copy paper for transfer type copying machines, photosensitive paper for electrofax systems, printing paper for simple printing machines, etc., and are susceptible to the effects of outside air and humidity. Paper jams occur when paper supply performance deteriorates. In addition, the image quality deteriorates due to such a reduction in the performance of the cut sheet. Therefore, when not copying, it may be necessary to take the cut sheets out of the paper supply tray and store them in a plastic bag or the like. In addition, with cut notes that have a photosensitive surface such as one coated with zinc oxide, the quality of the copied image may deteriorate due to the effects of temperature and humidity (the upper part of the cut sheet stored in the paper supply tray is affected by external light). It may cause low F.

Conventionally, a moisture-proof thin plate with a cutout in the area where the feed roll is located was tightly attached to the paper surface above the cassette in order to block temperature, humidity, and external light. However, since the moisture-proof thin plate is made of vinyl or metal, in high temperature and high humidity conditions, the vinyl or metal surface becomes sticky with water droplets and sticks to the paper on the cassette, causing the paper to not be fed. There was a problem.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the above-mentioned drawbacks and to provide a paper supply tray provided with a moisture-proof thin plate to which water droplets do not adhere.

Structure of the Invention The present invention aims to prevent water droplets from adhering to the paper surface of a moisture-proof thin plate made by bonding paper to a moisture-proof material such as vinyl or metal by bringing it into contact with the surface of paper in a supply tray. This solves the issue where the paper on the cassette would not be fed.

Here, the paper laminated on the moisture-proof material can be general high-quality paper or PPC paper, but other papers can also be used depending on the type of paper to be fed to the paper supply tray. Lamination is usually performed by bonding with an adhesive, but methods such as lamination are also possible.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view of an example of a conventional paper supply tray, and FIG. 2 is a sectional view of FIG. 1.

This supply tray stores paper 2 in a cassette, and is provided with a moisture-proof thin plate 3 on the top of the paper 2, and the moisture-proof thin plate is provided with a notch 4 into which a roller for feeding the paper 2 is inserted. FIG. 2 shows the state when the paper 2 is being pulled out, and 2a indicates the topmost paper that is being pulled out.

FIG. 3 is a cross-sectional view of the paper supply surface of the present invention.

In this example, a moisture-proof thin plate 3 made of a moisture-proof material 3a and paper 3b is used in place of the moisture-proof thin plate shown in FIG. The moisture-proof thin plate 3 made of a moisture-proof material 3a and paper 3b sufficiently isolates it from outside air, and prevents moisture from adsorbing on the paper surface 2a in the supply tray. In this case, it is preferable that the paper layer ε of the moisture-proof thin plate 3 be brought into close contact with the surface of the paper 2. Although the moisture-proof thin plate is movable in the vertical direction, it is immovable in the front, rear, left and right directions, but the specific means thereof will be omitted.

Example 1 250 sheets of paper 2 are placed on the paper supply tray 1, and 250 sheets of paper 2 with a thickness of 3
0μ aluminum foil metal layer 3a and 100μ thick high quality paper 3b
A moisture-proof thin plate 3 to which was attached with an acrylic resin adhesive was placed on the paper 2a with the high-quality paper 3b facing toward the paper surface. When I left this structure in a room with a relative humidity of 85 degrees for 48 hours and then made copies, I was able to make clear copies with no paper jams from the first sheet. The moisture content of the paper at this time was maintained at around 5 cm, which was the initial moisture content. Also, when I set and fed paper with a moisture content of 8.7% that had been kept in a room with a relative humidity of 85 degrees, no paper jams occurred.

Example 2 200 sheets of paper 2 are placed on the paper supply tray 1, and 200 sheets of paper 2 with a thickness of 2
A moisture-proof thin plate made of a 0μ iron foil metal layer 3a and a 80μ thick high-quality paper attached using a polyethylene resin adhesive is attached to the high-quality paper 3.
Place b facing the paper side and cover paper 2. With this structure, the same moisture-proofing effect and runnability as in Example 1 were obtained.

When the comparative papers were left in a stacked state in a room with a relative humidity of 85 cm for 48 hours, the moisture content of the first sheet of paper was about 8 cm. When this laminated paper was fed into a paper supply tray made of a moisture-proof thin plate and a single PVC sheet, a 30% misfeed occurred. Furthermore, I set paper with a moisture content of 8.7% and attempted to feed the paper in the same manner, but at this time all of the paper could not be fed.

Effects of the Invention The paper supply tray of the present invention is made of a moisture-proof thin plate made of a moisture-proof material and paper, and is strained so that the paper surface is brought into contact with the upper surface of the paper. Obtainable.

In addition, since the moisture-proof thin plate 3 is provided with a notch 4 in the part where the paper feed roller is located, the moisture-proof thin plate 3 does not have to be removed when feeding the paper (the paper 2 cannot be fed out with the paper feed roller). can.

Therefore, the moisture-proofing effect of the paper 2 is achieved even when the paper is fed out.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a conventional paper supply tray, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a sectional view of an embodiment of the present invention. Symbols in the figure: 1... Cassette; 2... Paper; 3... Moisture-proof thin plate; 3a... Moisture-proof material: 3b...-Paper: 4. One notch.

Claims (1)

[Claims] A paper supply tray characterized in that a moisture-proof thin plate formed by laminating a moisture-proof material and paper is provided so that the paper layer comes into contact with the surface of the paper stored in the paper supply tray.