JPS603667A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify a carrying controlling system of a recording material by constituting a titled device so that a carrying path of a recording material of an image forming device having plural picture forming parts is controlled selectively by picture information formed in each picture forming part. CONSTITUTION:A deflector 7 is usually directed in the direction for feeding a recording paper on a path (a) to a paper discharge part tray 9 through paths (c), (e) by a solenoid, and a roller 8 rotates clockwise CW. Also, by scanners 17, 18 for scanning a laser beam, the laser beam is reflected by respective mirrors 19, 20 and irradiated to respective drums (D1)5, (D2)6, by which an electrostatic latent image is formed on the drums D1, D2. The carrying path is divided roughly into (a), (b), (c), (d) and (e), and a recording paper fed from a paper feeding base 1 can be passed through three carrying paths of (a) (c) (e), (a) (d) and (a) (c) (d), and on the other hand, a recording paper from a paper feeding base 2 is fed to only a path of (b) (d).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image forming apparatus having a plurality of image forming sections.

(Prior Art) Image forming apparatuses having a plurality of image forming sections have been proposed. However, in such an image forming apparatus, it is impossible to perform simple control similar to a shaker having a single image forming section, and the structure inevitably becomes extremely complicated. There was a point.

(Objective of the Invention) An object of the present invention is to provide an image forming apparatus that eliminates the drawbacks of the conventional example described above and at the same time simplifies the control of recording material conveyance.

(Embodiment) FIG. 1 is a schematic diagram of a copy paper conveyance path device showing an embodiment of the present invention. Reference numerals 1 and 2 denote a plurality of paper feed trays, and the stacked sheets in each paper feed tray are fed one by one by paper feed rollers 3 and 4, respectively. Reference numerals 5 and 6 denote drums D1 and D2 for image formation, respectively, and various devices such as a dewdropper and a developing device for image formation are arranged around each drum (not particularly shown). The electrostatic images on each of the drums 5 and 6 are turned into visible images by a developing device, and each image is
The image is transferred onto each recording paper by transfer chargers 13 and 14, and becomes a permanent image by fixing devices 11 and 12, respectively. Reference numeral 7 denotes a deflector for selecting whether the recording paper that has passed through the fixing device 11 advances from path a to path c or path d, and is driven and controlled by a solenoid (not shown). Reference numeral 8 indicates a reversing feed roller capable of forward and reverse rotation; 9 and 10 indicate trays for discharging recording paper on which images are formed; 15 and 1;
Reference numerals 6 denote a light emitting section and a light receiving section, respectively, of a sensor device that detects the presence or absence of recording paper.

The deflector 7 is directed by a solenoid in a direction in which the recording paper on the path a is normally sent to the paper discharge section tray 9 via the paths c and e, and the roller 8 rotates clockwise CW. Further, 17 and 18 are scanners that scan laser beams, and the laser beams 17 and 18 are transmitted to each mirror 1.
9. Reflected by 20 and each drum D1, D2, 5, 6
is irradiated. As a result, electrostatic latent images are formed on the drums D1 and D2.

The conveyance paths are roughly divided into a, b, c, d, and e, and the recording paper fed from the paper feed tray 1 can pass through the following three conveyance paths.

b) a → c → e, b) a → d, c) a → c → d.

On the other hand, the recording paper fed from the paper feed tray 2 is b→
d route only. In case A), the deflector 7 and roller 8 are not particularly controlled, B) is the case when only the solenoid of the deflector 7 is activated, and C)
corresponds to the case where the solenoid of the deflector 7 is activated and the roller 8 rotates counterclockwise CCW when the trailing edge of the recording paper in the traveling direction is detected by the light receiving section 16 of the sensor device in the double-sided print mode. do. In this case, when the sensor light receiving unit 16 detects the trailing edge of the recording paper (opposite to the clockwise rotation CW of the roller 8), the sensor light receiving unit 16 detects the rear end of the recording paper (opposite to the clockwise rotation CW of the roller 8).
Restore to rotation.

FIG. 2 is a block diagram of input/output devices necessary for the above control. All controls within this device are performed by a CPU 21, and includes a read-on memory ROM 22 for control programs and a random access memory RAM 23 as a work area for control.

Data DATA transmitted from the document reading device in this apparatus or communication means with the outside is stored in the buffer 24 for each page of the document, and at this point, the CPU 21 reads information on the drum on which the data is to be written. The selector 25 is controlled according to this information, and the information is sent to the page buffer 26 for drums D1 and 5 or the page buffer 27 for drum D2.

After that, the laser 128 is activated by a command from the CPU 21.
It is still output to the laser 229.

FIG. 3 is the above control flow diagram. When the data is stored in the buffer 24 in FIG. 2, the data indicating the drum to which the data is to be written is read (
Step 31), if the data is for the drum C2, the paper feed roller 4 is driven to feed the paper from the paper feed table 2 (step 33), and the paper is passed through the conveyance paths d and d to the drum D.
Printed on 2.6. On the contrary, the buffer 24
If the drum data in is for drums D1 and 5,
The paper feed roller 3 is driven (step 32), and the paper passes through the conveyance path a and is printed on the drums D1 and D5.

Note that when printing is to be performed again on the same recording paper after printing is completed (multiple printing), or when the paper is output to the paper output tray 10 (step 34), the solenoid of the deflector 7 is driven to change the conveying direction of the recording paper. , the recording paper is conveyed by switching to the conveyance path d (steps 41, 42, 43).

In other cases (that is, during double-sided printing or output to the paper output tray 9), the solenoid of the deflector 7 remains in the normally OFF state. Here, if the recording paper is not in the double-sided print mode, the rotation direction of the roller 8 does not change. On the other hand, in the case of double-sided print mode, the rear edge of the recording paper is at the light receiving part 1 of the sensor shown in Figure 2.
6, the rotation of the roller 8 is stopped (steps 36, 37), and the roller 8 starts rotating fully counterclockwise CCW at a timing synchronized with the image on the drums D2 and 6 (step 38), and the recording is started. When the trailing edge of the recording paper is detected after the paper has been fed out, the roller 8 returns to clockwise CW rotation.

During the flow in FIG. 3, between steps 35 and 40,
Even if the drum data indicates drums D2 and 6,
Driving of the paper feed roller 4 is prohibited, and steps 41 to 4
3, the paper feed roller 4 is driven and the drums D2 and D6
Writing data on top is prohibited.

In addition, in each conveyance path shown in FIG.
It is also possible to make the transport paths a and b the same by making them common.

Further, the rotational direction control of the forward/reverse roller 8 does not need to be synchronized with the light receiver 16 of the sensor,
For example, a drum clock or the like may be used.

(Another Embodiment) FIG. 4 is a schematic diagram of a conveyance path showing another embodiment of the present invention. In FIG. 4, the same (equivalent) components as in FIG. Omitted. Distance l1 between the leading edge of the recording paper in paper feed tray 1 and the transfer portion of drum D1/5, paper feed tray 2
Distance l2 between the leading edge of the inner paper and the transfer section of drum D2/6
, and the distance l3 from the positions of the paper presence/absence detection sensors 15 and 16 to the transfer portions of the drums D2 and 6, if some or all of them are equal, it is possible to simplify the control method more than what is explained above. can.

In addition, there are the following special print modes other than those described above. That is, in FIG. 1, drum D
The same data is written on D1/5 and D2/6, and the paper conveyed from paper feed tray 1 is printed on D1/5 and output to paper output tray 9, and the paper conveyed from paper feed tray 2 is printed at the same time. To create two copies of a file, such as printing by the drums D2 and D6 and outputting to the paper output tray 10,
Alternatively, the paper ejection section trays 9 and 10 are configured to be the same, and the odd-numbered pages of the document are stored on the drums D1 and D5.
It is also possible to print even-numbered pages in 2 and 6 alternately.

Furthermore, although the control of the present invention is performed for each page of a document, each of the above-mentioned modes can also be set when preparing to start the printer or when switching files.

(Effects of the Invention) As described above, the present invention is capable of selectively controlling the conveyance path of a recording material in an image forming apparatus having a plurality of image forming sections based on image information formed in the above-mentioned image forming sections. Because of this configuration, the recording material conveyance control system can be extremely simplified, and various print modes can be easily realized.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a copy paper conveyance path device according to an embodiment of the present invention;
Figure 2 is a block diagram of the input/output device for the conveyance path;
The figure is a control flow diagram thereof, and FIG. 4 is a schematic diagram of a conveyance path according to another embodiment of the present invention. 1, 2... Paper feed table 3, 4... Paper feed rollers 5, 6... Image forming drum 7...・
...... Deflector 8 ...... Reversing feed rollers 9, 10...
...Sheet discharge section trays 15, 16... Light emitting section and light receiving section 17, 18 of conveyed paper presence/absence detection sensor ... Laser beam scanners a, b
, c, d, e... Each conveyance path (Figure 3) RETURN

Claims (1)

[Claims] a first image recording section that records an image on a recording material; a second image recording section that records an image on a recording material conveyed from the first recording section; An image forming apparatus comprising: a plurality of uniquely selected recording material transport paths.