JPH0822713B2 - Ejection paper tray of image forming apparatus - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge paper tray for a copying machine, a printer and the like.

2. Description of the Related Art A large-sized copying machine for copying drawings has various characteristics, unlike a general office copying machine. For example, the exposure optical system is not a system in which a document placed on a stationary platen glass is scanned and exposed by moving the optical system like a general office copying machine. By moving it, an electrostatic latent image corresponding to the original is formed on the photosensitive drum. Also copy paper is A0 size, A1
Since the size of the paper is very large, the discharge paper tray for storing the paper after copying is also very large, and is generally provided at the upper end of the copying machine housing.

Further, the discharge paper tray of a large-sized drawing copying machine needs to store large paper, and the slope of the tray is long and the inclination angle is small, so it is difficult for the paper discharged onto the tray to fall to the front end of the inclined tray. There was a problem. Further, even if the paper drops, static electricity or the like causes the paper to be skewed, so that the paper cannot be accurately stacked. Therefore, in Japanese Patent Laid-Open No. 60-2567, air is blown onto the paper on the discharged paper tray, and in Japanese Patent Laid-Open No. 61-23077, the paper on the discharged paper tray is accurately moved by vibrating the discharged paper tray. Attempts have been made to align the front ends and stack them.

Problems to be Solved by the Invention However, the above-described conventional technique has a drawback that the structure is complicated, and when a long copy or a small copy is sampled separately, the ejected paper is placed on the tray. There was a problem that it could not be laminated accurately.

The present invention has been made in view of the above circumstances, and an object thereof is to stack sheets by aligning the rear ends of the sheets discharged onto a tray with a simple structure and easily stack them as needed. It is an object of the present invention to provide a discharged paper tray of an image forming apparatus that allows an operator to remove stacked discharged paper.

Means for Solving the Problems In order to solve the above-mentioned problems of the prior art, the present invention relates to an ejected paper tray of an image forming apparatus for accommodating the paper conveyed by the paper conveying means and discharged outside the apparatus. , One end of which is attached to the main body of the apparatus via a biasing means and the other end of which is provided with a retractable / drawable flexible sheet having a handle for withdrawing, and the sheet discharged onto the flexible sheet is Provided is a discharge paper tray of an image forming apparatus, which is provided with paper pressing means for aligning and stacking rear ends.

The sheet conveyed by the working sheet conveying means is discharged onto the flexible sheet forming a part of the discharged sheet tray.
At this time, the ejected paper is pressed from above by the paper pressing means, so that the paper is braked, the rear ends of the paper are aligned, and the ejected paper is stacked on the flexible sheet. The operator can easily take out the sheets stacked on the flexible sheet by pulling the handle and moving the flexible sheet to the front side.

EXAMPLES The present invention will be described in detail below based on examples shown in the drawings.

FIG. 1 is a schematic configuration diagram of a large-sized drawing copying machine equipped with a discharge paper tray according to an embodiment of the present invention, in which a charging corotron 11, an image exposure system 12, and a photosensitive drum 10 rotating in the direction of arrow A are provided. A developing device 13, a transfer corotron 14, a peeling corotron 15, a cleaning device 16, and a charge eliminating corotron 17 are provided in this order.

An electrostatic latent image is formed by the image exposure system 12 on the surface of the photosensitive drum 10 uniformly charged by the charging corotron 11, and the electrostatic latent image is developed by the developing device 13 to be a toner image. The image exposure system 12 includes a known document self-propelled document handler 30, an exposure lamp 31, a mirror 32, a lens 33, and a mirror 34. The document self-propelled document handler 30 is provided with a plurality of conveying rollers 35, and two pinch rollers 36 are brought into contact with each conveying roller 35 to form a conveying roller pair, and a pass finger 37 is rotated. The original self-propelled path length is determined by. The original to be copied is inserted from the original insertion table 38 and conveyed by a pair of transport rollers 39.
Manuscript self-propelled document handler 30
Will be introduced to.

Reference numeral 40 denotes a sheet wound in a roll shape, which is cut into a predetermined length by a cutter pair composed of a fixed blade 41 and a rotary cutter 42 to obtain a cut sheet 43. The toner image on the photosensitive drum 10 developed by the developing device 13 is transferred onto the paper 43 by the transfer corotron 14, the paper is separated from the photosensitive drum 10 by the peeling corotron 15, and is shown by the dotted line by the conveyor belt 19. It is sent to the oven type fixing device 44 along the carrying path 22.

On the other hand, the surface of the photosensitive drum 10 having the toner remaining without being involved in the transfer is cleaned by the cleaning device 16,
The charge-removing corotron 17 removes charges on the photosensitive drum, and one copy cycle ends.

The oven-type fixing device 44 includes a housing 45 provided above and below the paper transport path 22, and a heat insulating member 46 inside the housing 45.
A plurality of heaters 47 provided via the drive sprocket 48 and a plurality of idlers 49, and a chain gripper 50 for transporting a sheet wound around a plurality of idlers 49. Conveyor belt
The paper 43 conveyed by 19 is the chain gripper.
The toner image is fixed while being gripped by 50 and passing between the heaters 47. The sheet of paper 43 which has been fixed is conveyed upward by a plurality of sets of conveying rollers 20, and is ejected onto the ejected paper tray 52 according to the present invention by the pair of ejection rollers 51.

The ejected paper tray 52 is composed of an upper end surface 53 of the copying machine housing which is inclined slightly forward and a mylar sheet 54 placed on the upper end surface 53, and the positional relationship is shown in FIG. The liler sheet 54 is connected to a spring 55 having a constant load regardless of the pulling stroke, for example, Conston (a product name of Sanko Harajuku Co., Ltd.), and the flexible mylar sheet 54 is pulled into the rotating shaft 56 together with the spring 55. It is configured to be. A handle 57 for pulling out the mylar sheet 54 is attached to the tip of the mylar sheet 54. FIG. 3 (A) shows the state when the mylar sheet 54 is stored, and (B) shows the state when pulled out. . Further, the state at the time of pulling out is shown by a dotted line in FIG.

58 is a paper presser, one end of which is the copying machine housing 1
Paper that is stuck to the paper and is ejected from the ejection roller pair 51
It acts to hold down 43 and to align the rear ends thereof to stack them on the mylar sheet 54. The paper retainer 58 is formed of, for example, a wire and has a shape as shown in FIG. 4, for example, but the shape is not limited to this.

The operation of the present embodiment configured as described above will be described below.

The paper 43 on which a hard copy is formed and which is conveyed upward by the conveying roller pair 20 is discharged onto the discharged paper tray 52 by the discharging roller pair 51. The paper 43 discharged by the discharge roller pair 51 falls on the tray 52 due to gravity, but since it is pressed by the paper pressing member 58, the trailing end of the paper 43 stops at the upper part of the tray 52 where it does not separate from the discharge roller pair 51.
The paper 43 that has been continuously discharged is stacked on the discharged paper tray 52 with its rear ends being roughly aligned by the action of the paper presser 58.

When the small size paper 43 is stacked on the discharged paper tray 52, the copying machine may be too large to reach the stacked paper 43 by the operator's hand. In this case the handle
If you pull 57 toward you, you can pull the paper 43 while the paper 43 is on the mylar sheet 54.
You can receive 43. When the paper 43 is removed from the top of the mylar sheet 54 and the hand is released, the spring force of the spring 55 causes the mylar sheet 54 to naturally return to the stored state shown by the solid line in FIG.

As described above in detail, according to the present invention, the discharged sheets are stacked on the flexible sheet with the trailing edges of the sheets aligned, and the flexible sheets are moved and stacked as necessary. Since the sheets are taken out, sheets of different sizes can be neatly stacked and placed on the tray by aligning the rear ends of the sheets, and it is very easy to remove the sheets from the tray.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a copying machine equipped with a discharge paper tray according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the discharge paper tray adopted in FIG. 1, and FIG. FIG. 3 is a schematic view showing a pull-out mechanism, and FIG. 3 (A) shows a state when stored, (B)
Shows the states at the time of pulling out. FIG. 4 is a plan view of the paper retainer. 10 ... Photosensitive drum, 11 ... Charging corotron, 12 ... Image exposure system, 13 ... Developing device, 14 ... Transfer corotron, 15 ... Peeling corotron, 16 ... Cleaning device, 17 ... Static elimination corotron, 30 ...... Original self-propelled document handler, 43 …… Paper, 44 …… Oven type fixing device, 51 …… Eject roller, 52 …… Eject paper tray, 53 …… Housing top surface, 54 …… Mylar sheet, 55… … Spring, 56 …… Rotary axis, 57 …… Handle, 58 …… Paper retainer, 62 …… Endless rubber belt, 63 …… Handle.

Claims (1)

[Claims] Claim: What is claimed is: 1. An ejected paper tray of an image forming apparatus for accommodating a sheet conveyed by a sheet conveying means and discharged to the outside of the apparatus.
A flexible sheet which has a handle for pulling out and which can be wound up and pulled out is provided at the other end, and a sheet pressing means for aligning and stacking the rear ends of the ejected sheets on the flexible sheet is provided. An ejected paper tray for an image forming apparatus.