JPS6222889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for a double-sided copying machine.

2. Description of the Related Art It is well known that copies can be obtained by copying methods such as electrophotography. This method involves forming an electrostatic latent image on a photoreceptor, developing it, transferring the toner image onto a transfer sheet, fixing it, and ejecting it from the copying machine to obtain a copy.

In recent years, in order to save paper or simplify the storage of copies, so-called automatic double-sided copying, in which copies are automatically made on both sides of a sheet of paper, has come into use. This automatic two-sided copying can be roughly divided into one-sided copying of the desired number of copies using the first original, the sheets on which one-sided copying has been completed, and the paper that has been copied on both sides are temporarily stacked and stored in the paper feeder for double-sided copying, and then Second
In order to copy on the back side of the paper using the first original, the single-sided copied paper is fed one sheet at a time from the double-sided copying paper feeder to complete double-sided copying, or one copy is made using the first original. Complete one-sided copying and place it in the paper feeder for double-sided copying, then copy on the back side of this paper using the second original, and then double-sided copying is performed for each sheet of paper to create the desired copy. A method is known in which the process is repeated for the number of sheets.

In an automatic double-sided copying machine using the former method, for example, as shown in FIG. 1, a first original is placed on a platen 1, and an electrostatic latent image corresponding to this first original is formed on a photoreceptor drum 2. do. This electrostatic latent image is developed by a developing device 3 to form a toner image. On the other hand, the transfer paper 4 is transported from the paper tray 5 by a paper transport device 7, its position is corrected by a registration roller 8, and it comes into contact with the toner image in synchronization with the rotation of the photosensitive drum 2. Next, the toner image is transferred to the transfer paper by the transfer corotron 9, and the toner image is transferred to the fixing device 1 by the conveyor belt 10.
1 to fix the toner image. After single-sided copying has been completed in this way, the transfer paper is turned over by the paper reversing device 12, and then
A desired number of sheets are stacked and stored in the double-sided copy paper feeder 13. Next, in order to perform backside copying, a second original is placed on the platen 1 and a toner image is formed on the photosensitive drum in the same manner as described above.

Transfer paper for back-side copying is fed from a paper feeding device 13 for double-sided copying, conveyed by a feed roller 14 for double-sided copying and a paper conveyance device 7, and after being positioned by a registration roller 8, comes into contact with the toner image. After transfer and fixing are performed in the same manner as described above, the copy sheet on which double-sided copying has been completed is discharged from the copying machine by the paper discharging device 15 to obtain a double-sided copy.

The latter method differs from the former method in that it stores only one sheet of paper that has been copied on one side, then copies the back side, and then makes double-sided copies for each sheet of paper. In order to make it possible to copy the back side of a sheet that has been copied on one side, it is necessary to first store the sheet that has been copied on one side in a paper feeder for duplex copying provided in the copying machine, and then feed the sheet again when copying on the back side.

Then, the paper sent out from the duplex copying paper feeder is corrected for positional deviation in a direction perpendicular to the direction in which the paper travels, and then returns to the position where it was first sent out.
That is, it must be aligned with the position of the paper stored in the paper tray 5. In order to correct this lateral positional shift, an aligner 6 is provided below the paper tray 5.

The aligner 6 must be constructed so that it can be opened to the outside of the copying machine in order to remove paper jams when they occur, and the paper tray 5 must also be constructed so that it can be opened to the outside of the copying machine for replenishing paper. You have to become familiar with it.

As a method of opening the copying machine to the outside, it is conceivable to pull out the paper tray 5 and aligner 6 individually from the copying machine, but this would not only complicate the structure, but also troublesome alignment during manufacturing, and There is also a risk of misalignment due to machine vibration.

The object of the present invention is to solve these problems and provide a device which is free from mutual positional deviation and which can be opened from each other.

The object of the present invention is to provide a paper supply tray 5 of a double-sided copying machine.
An aligner 6 for correcting lateral misalignment of single-sided copied paper sent from the double-sided copying paper feeder is attached below the copying machine so that the paper supply tray 5 can be pulled out from the aligner 6.
This is achieved by a paper feeding device for a double-sided copying machine, which is characterized in that it is provided so as to be rotatable in the vertical direction.

The apparatus of the present invention will be explained below using examples (see FIGS. 2 and 3).

The paper tray 5 and the aligner 6 are the aligner 6
By fitting the connecting fitting 22 of the paper tray 5 into the more protruding pin 31, the paper tray 5 is rotatably joined.
Normally, the paper tray 5 is fixed in the state shown in FIG. 3 by its own weight and a stopper (not shown).

The paper tray 5 has a cassette 26 that stores the paper 4.
This is a tray for placing paper on the cassette 26, and by loosely fitting two positioning pins 23 on the paper tray 5 into two through holes (not shown) provided in the cassette 26, the cassette 26 and the paper can be placed. Tray 5 is correctly positioned.

On the other hand, the aligner 6 has two right and left rails 34, which allow it to be inserted into and pulled out from the main body of the copying machine. The paper that has been copied on one side is brought diagonally to the side guide 32 by the skew roller 33, and is fed while the inclination is being adjusted.

Next, the assembly and adjustment of the device of the present invention will be explained.

After adjusting the position of the positioning pin 23 and the connecting fitting 22 in the paper tray 5, and adjusting the position of the side guide 32 and the pin 31 in the aligner 6, if the connecting fitting 22 and the pin 31 are fitted, the cassette The side registrations of the paper 4 inside and the single-sided copied paper running along the aligner side guide 32 match. Thereafter, the rail 34 is fixed to the main body of the copying machine, and the whole is mounted so as to be movable toward the rear (to the left in FIG. 3). At this time, the distance a between the frame 18, which is the reference plane of the side registration of the copying machine main body, and the paper 4 is already equal to the distance a between the paper 4 and the aligner side guide 3.
2 and 2, it is possible to adjust the side registration of both by simply adjusting the damper 25.

As described above, in the present invention, the aligner 6 is attached to the main body of the copying machine so that it can be pulled out, and the paper tray 5 is attached to the aligner 6 so as to be rotatable, so that both can be opened to the outside of the copying machine and can be assembled and adjusted. can also be easily done.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing a double-sided copying machine to which the invention is applied, FIG. 2 is an exploded perspective view of the apparatus of the invention, and FIG. 3 is a sectional view of the apparatus of the invention. Codes in the figure: 1... platen; 2... photosensitive drum; 3... developing device; 4... transfer paper; 5... paper supply tray; 6... aligner; 7... paper transport device; 8... Registration roller; 9...
...Transfer corotron; 10...Transport belt; 11...
... Fixing device; 12 ... Paper reversing device; 13 ... Paper feed device for double-sided copying; 14 ... Feed roller for double-sided copying; 15 ... Paper ejection device; 18 ... Frame;
22... Connection fitting; 23... Pin; 24... Handle; 25... Damper; 26... Cassette; 3
1... Pin; 32... Side guide; 33... Skew roller; 34... Slide rail.

Claims (1)

[Claims] 1. An aligner 6 is installed below the paper supply tray 5 of the duplex copying machine to correct the lateral misalignment of the single-sided copied paper sent from the duplex paper feeder.
A paper feeding device for a double-sided copying machine, characterized in that it is attached to the copying machine main body so that it can be pulled out, and the paper supply tray 5 is provided so as to be rotatable in the vertical direction relative to the aligner 6.