JPH04117864U - paper stacking device - Google Patents

Abstract

(57) [Summary] [Objective] To provide a paper stacking device capable of stacking papers so that their leading edges are accurately aligned and there is no lateral positional deviation, regardless of the paper size or paper type. [Structure] Formed as a flexible elastic belt-like member with one end fixed to the upper part of the paper ejection port of the image forming apparatus main body and extended above the paper ejection tray to near the front end of the paper ejection tray, and the paper is ejected from the paper ejection port. Different weights suitable for stopping the advance of the paper for each paper size are placed on the upper surface of the presser member that holds down the image-formed paper discharged onto the tray, at positions corresponding to the leading edge of the paper at the stack position for each paper size. A weight can be attached.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a stacking device for image-formed paper ejected from an image-forming device. do.

0002

[Prior art]

Image forming devices using electrophotographic processes such as electrophotographic copiers and electrostatic printers As shown in Figure 3, the paper 1 is fixed by the fixing device 2 at the final stage of the image forming process. Thereafter, the paper is ejected from the paper ejection port to the paper ejection tray 3 by the paper ejection roller 4 and stacked. Here, the paper 1 that is ejected is pressurized and heated by the fixing device 2, so it is ejected in a curled state. Because the paper ejection speed is fast, especially in high-speed image forming devices, the paper ejection tray is The sheets 1 ejected to A 3 may not be overlapped accurately and may become disordered. discharged When a large number of sheets of paper are loaded, the paper must be fanned and rearranged, making it difficult to It always takes time. It is also equipped with a circulating automatic document feeder (RADF). When making multiple copies using a copying machine, make copies one by one in page order, and As shown in Figure 4, it is easy to sort the copies one by one. A machine that alternately shifts the paper output tray 3 from side to side after each copy, like a puppy wagging its tail. The doggy tail method is sometimes adopted, but in that case, If the ejected paper is disturbed, the sorting effect will be diminished.

0003 Therefore, in order to stack the ejected sheets in a uniform state, In Japanese Patent No. 0960, as shown in FIG. Mylar sheet, etc. that is fixed and extends above the paper output tray 3 to near the front end of the paper output tray A flexible elastic belt-like paper holding member 5 is provided, and the friction between this and the paper presses the paper. A method of suppressing the paper by reducing the ejection speed is disclosed. For the bottom surface of the presser member A member 6 with high resistance, such as a bristle brush, is glued to the part that comes into sliding contact with the top surface of the paper. , slidingly contacts the upper surface of the paper 1 discharged from the paper discharge roller 4 to prevent the paper from advancing. This method makes it possible to align the paper to a certain extent, but the size of the paper that is ejected is As the size increases, the friction between the ejected paper and the stacked paper The resistance increases, and as shown in FIG. This may cause the stacked paper to come into contact with the It becomes. Now, make sure that the paper output tray 3 is installed so that it is tilted forward and downward to some extent. If so, the paper extruded as described above will not tend to slide down due to its own weight and the edges will align. However, the extruded paper is often extruded in a skewed state, causing it to slip and fall. Even if the tips are aligned, they will be stacked horizontally, resulting in the above-mentioned problem. - If the tail method is used, it will not be able to perform its function.

0004

[Problem that the idea aims to solve]

This invention has been developed in consideration of the above-mentioned actual situation of conventional paper stacking devices. Regardless of the stiffness of the paper, ensure that the edges of the paper are aligned accurately and there is no horizontal misalignment. The object of the present invention is to provide a paper stacking device that can stack paper as desired. Ru.

[0005]

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has been developed so that one end is installed above the paper ejection port of the main body of the image forming apparatus. is fixed, and a flexible elastic belt extends above the output tray to near the front edge of the output tray. The image-formed sheet is formed as a shaped member and is discharged onto the paper output tray from the above-mentioned paper output port. In a discharged paper stacking device having a presser member that presses paper, the upper surface of the presser member is for each paper size at the position corresponding to the leading edge of the paper at the stack position for each paper size. It is characterized by the ability to attach weights of different weights suitable for stopping the advance of the paper. do.

[0006]

[Effect]

Since this paper stacking device is configured as described above, the size of the paper to be ejected is the leading edge of the paper placed in the designated stack position on the output tray. With a weight of a predetermined weight attached to the holding member at When the paper is ejected to the tray, the leading edge of the paper ejected from the paper ejection roller stops the paper from advancing. The leading edge of the paper is firmly pressed down, and the stacked paper is firmly held down. grasp.

[0007] Furthermore, according to the paper size, the required number of weights of different weights and unit weights of the same weight are combined. By adjusting the weight to a predetermined weight, the cost of the weight can be reduced.

[0008] Also, even if the size is the same, the stiffness differs depending on the type of paper, so use thin paper or paper with low stiffness. When using the machine, reduce the weight for sizes other than the maximum size position. , reduce the frictional force between the paper and the presser member to prevent the next discharge caused by excessive frictional force. It is possible to prevent collisions with paper, jams, paper wrinkles, etc. Also, cardboard When using paper with large curls or curls, if you are using a large size paper and cannot hold the leading edge of the paper. In this case, this problem can be resolved by setting the weight at the large size compatible position to be heavier. be able to. As described above, the structure of the present invention allows paper to be printed regardless of paper size or paper type. , accurate and stable paper alignment becomes possible.

[0009]

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings.

0010 1 and 2 are a side sectional view and a plan view of a paper stacking device according to an embodiment of the present invention. Ru.

[0011] One end is fixed to the upper part of the ejection port of the image forming apparatus main body 7, and the paper ejection tray moves over the paper ejection tray 3. A flexible elastic belt-like paper holder made of Mylar sheet, etc., which extends to the front end of Ray 3. A member 5 is provided, and a bristle brush or the like is provided on the lower surface of the member 5 that makes sliding contact with the upper surface of the paper. The point that the member 6 with a large resistance is implanted is that it is different from the conventional paper stack explained in FIG. It is the same as the lock device. The holding member 5 serves as a bar for advancing the paper discharged onto the paper discharge tray 3. In order to maintain the balance, two are provided symmetrically with respect to the center line of the paper.

On the holding member 5, there is a position corresponding to the front edge of each size of paper stacked at a predetermined position on the paper ejection tray 3, that is, a paper ejection position for each size of B5, A4, and A3. A weight 8 having a weight corresponding to the mass of paper of each size can be attached at a position l ₁ = 160 to 180 mm, l ₂ = 200 to 220 mm, l ₃ = 280 to 300 mm from the rear end of the tray 3. A mark indicating the mounting position is printed on the If the weight 8 is made of metal plates, etc. each weighing 1 to 1.5 g, and the number of metal plates is changed depending on the paper size and paper type, it is not necessary to make weights of various weights. Even if you want to change the weight depending on the type of paper even if the size is the same, you can easily adjust it. The weight of the weight is increased as the size increases in order to prevent paper ejection failure due to the load exerted by the holding member. In this embodiment, one, two, and three unit weights of the same weight are attached to B5, A4, and A3 sizes, respectively.

[0013] In this embodiment, the holding member 5 is made of non-magnetic plastic such as Mylar sheet. However, a thin elastic magnetic sheet is used for the presser member 5, and it is used as a weight. If you use a magnet, the weight will be magnetically attracted to any position on the presser member, making it easy to attach/detach and adjust the position. It becomes easier to adjust.

[0014]

[Effect of the idea]

As described above, according to the present invention, paper can be ejected from the main body of the device onto the ejection tray with a simple configuration. Hold the leading edge of the stacked paper at the specified stacking position, and also grip the stacked paper. Even if the paper is curled by the fixing device and is ejected, it will not be disturbed. Paper can be aligned accurately, improving work efficiency. Also, for sorting paper Even when using a doggytail output tray, parts of the copy can be clearly identified. Since the trays can be distinguished from each other, the amount of movement of the tray from side to side is reduced, and the size of the device can be reduced. Effective in molding.

[0015] Furthermore, by changing the weight and position of the weight, any paper size or It is possible to make immediate adjustments to paper types, so you can make adjustments in any situation. Accurate and stable paper alignment for ejected paper can be performed.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the configuration of an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a cross-sectional view showing a schematic overall configuration of an example of an image forming apparatus in which a paper stacking device of the present invention is installed.

FIG. 4 is a cross-sectional view showing the configuration of a doggy tail paper discharge tray.

FIG. 5 is a side sectional view showing the configuration of an example of a conventional paper stacking device.

FIG. 6 is an explanatory diagram illustrating the problem.

[Explanation of symbols]

1 Paper 3 Paper output tray 4 Paper ejection roller 5 Paper holding member 6 Resistance member 7 Image forming apparatus body 8 Weight 10 Weight installation position mark

Claims (3)

[Scope of utility model registration request] Claims: 1. Formed as a flexible elastic belt-like member, one end of which is fixed above the paper ejection port of the main body of the image forming apparatus, and extends above the paper ejection tray to near the front end of the paper ejection tray; In a paper stacking device having a presser member that presses the image-formed paper ejected onto the paper ejection tray, a paper sheet is attached for each paper size at a position corresponding to the leading edge of the paper at the stacking position for each paper size on the upper surface of the presser member. A paper stacking device characterized in that weights of different weights suitable for stopping the advance of paper can be attached. 2. The paper stacking device according to claim 1, wherein the weights for each paper size attached to the holding member are formed by combining a required number of unit weights of the same weight. 3. The paper stacking device according to claim 1, wherein the weight of the weight for each paper size differs depending on the stiffness of the paper.