JPH01117134A - Paper feeding cassette for image former - Google Patents

Abstract

PURPOSE:To keep off any double-feed at the time of paper feeding as well as to straighten a curl by curving the paper feeding direction center of a base plate into a projectoin form. CONSTITUTION:In a paper feeding cassette 1, the paper feeding direction center of a base plate 2 is being curved into a projecting form. In brief, looking from the side, it is formed into an almost chevronwise section, and sheets of feed paper 10 stacked on the base plate 2 are also curved in the chevronwise form. Consequently, the feed paper 10 stacked is in no case dislocated and stuck close to the feed paper 10 adjacent piece by piece, and the edges are not turned up and formed into stepped form. Therefore paper feeding out of the paper feeding cassette 1 is smoothly carried out in order by a pick roller 3 and, after image formation is performed by an image carrier 4, it is pressurized by a heat pressure roller 5 and discharged out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feed cassette for an image forming apparatus, and in particular to a paper feed cassette that prevents double feeding of paper and enables stable paper feeding. Regarding the shape of the base plate.

[Prior Art] In general, this type of paper feed cassette has a plurality of paper feeds 10 stacked on a base plate 211 of the paper feed cassette 20, as shown in FIG. The paper is sequentially delivered from the discharge port 20a to the image carrier 4 by the pick roller 22, and then heated by the thermal pressure roll 5 and discharged.

Conventionally, the end of the base plate 21 was bent upward on the side of the paper feed outlet 2Oa of the paper feed cassette 20.

[Problems to be Solved by the Invention] However, since the above-mentioned conventional paper feed force roller 20 has a mechanism for feeding paper by lifting the pick roller 22 side of the base plate 21, the paper feed units 10 do not come into close contact with each other. Their tips were aligned, causing double feeding.

In addition, in the image forming apparatus, it is necessary to pass the fed paper lO through the heat pressure roll 5 at the final stage of the printing process, and the end of the base plate 21 is bent upward. The curling direction of the fed paper lO in the state where the paper is stored and the curling direction by the heat pressure roll 5 are the same, which has the disadvantage that the curling becomes even larger.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems. A plurality of fed sheets are stacked on a base plate, and the fed sheets are sequentially pushed out by a pick roller to carry an image. In a paper feeding cassette or kit of an image forming apparatus that feeds the image forming apparatus to the image forming apparatus, double feeding of paper is prevented by curving the center of the base plate in a convex shape in the paper feeding direction.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing an example of the present invention in use.

In the drawing, 1 is a paper feed cassette, 2 is a base plate, 3 is a pick roller, 4 is an image carrier, and 5 is a heat pressure roll.

The above-mentioned paper feed force sensor) 1 has a plurality of paper feeds lO stacked on a base plate 2, and the stacked paper feeds lO are sequentially transferred to the image carrier 4 from the paper feed outlet la by a pick roller 3. Sent. Then, the fed paper 1 on which an image is formed on the image carrier 4
0 is then discharged through a hot pressure roll 5.

In the paper feed cassette 1 of the present invention, the center of the base plate 2 in the paper feed feeding direction (direction A in the figure) is curved in a convex shape. That is, as shown in Figure 1,
When viewed from the side, it has a substantially rectangular cross-sectional shape, and the paper feed lO stacked on the base plate 2 is also curved in a rectangular shape. Therefore, each stacked paper feed lO is 1
Each sheet is shifted from the adjacent fed sheet lO and does not come into close contact with it, and its end surfaces are not aligned and have a stepped shape.

Therefore, the paper from the paper feed cassette 1 is smoothly fed sequentially by the pick roller 3, an image is formed on the image carrier 4, and then the paper is pressurized by the heat pressure roll 5 and discharged. .

[Effects of the Invention 1] As explained above, the present invention provides a paper feed cassette for an image forming apparatus in which the center of the base plate in the paper feeding direction is curved in a convex shape, so that the stacked fed sheets are shaped like a square. The paper is stocked in a curved manner, and adjacent paper feeds do not come into close contact with each other.
Since the end faces are not aligned, there is an effect of preventing double feeding when paper is fed by the pick roller.

Furthermore, since the fed paper is curved in the shape of a square, the fed paper is stored curled in the opposite direction to the curling direction applied by the heat pressure roll, and after pressurization, the paper cancels out each other and curls. It has the effect of correcting.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how the paper feed cassette of the image forming apparatus of the present invention is used, and FIG. 2 is a perspective view showing the paper feed cassette of the conventional image forming apparatus.

Claims (1)

[Scope of Claims] A paper feed cassette for an image forming apparatus in which a plurality of fed sheets are stacked on a base plate and the fed sheets are sequentially pushed out by a pick roller and sent to an image carrier, wherein the paper feeding direction of the base plate is A paper feed cassette for an image forming apparatus characterized by having a convexly curved center.