JPH0320836Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording device, and particularly to a recording device that transfers a visible image formed by exposing and developing a photoreceptor onto a recording paper.

[Conventional technology]

In this type of recording device, a photoreceptor is charged, and the charged surface of the photoreceptor is exposed to light corresponding to a recorded image.
The electrostatic latent image generated by exposure is developed, while recording paper is fed toward the photoreceptor, the developed image on the photoreceptor is transferred to the recording paper, and the transferred image on the recording paper is fixed as necessary. , and the recording paper is ejected from the apparatus.

Since paper feeding abnormalities, so-called paper jams, may occur in the recording paper conveyance path, paper sensors such as micro switches and photo sensors are placed in required parts of the conveyance path, and the paper sensors detect the arrival of recording paper or the arrival of recording paper at a predetermined timing. If the passage of paper is not detected, or if a paper sensor at a portion where paper does not arrive during normal paper feeding detects the arrival or presence of paper, conveyance of the recording paper is stopped and a paper jam display or alarm is issued.

[The problem that the idea aims to solve]

When the operator receives a paper jam display or alarm, the operator should remove the cassette from the recording paper storage section,
Alternatively, the jammed paper may be taken out by opening the device cover (front cover), but depending on the jammed area, it may be difficult to check the jammed paper, especially if the paper size is small. Additionally, broken pieces may remain when removing the jam paper. If a piece of paper remains in the paper sensor section, the printing apparatus may not return to a state in which printing is possible, or even if it returns, it will stop the paper jam again in the printing processing operation in response to the next print start input. If a piece of paper is not detected by the paper sensor and the recording processing operation is restarted, the piece of paper will pass through the paper conveyance path, the photoreceptor,
It may adhere to or wrap around the cleaning roller or the like, which may cause more trouble than the first paper jam. Therefore, when paper jams occur, it is necessary to reliably remove the jam paper from within the apparatus.

An object of the present invention is to facilitate visual recognition of the jam paper inside the device.

[Means to solve the problem]

The recording apparatus of the present invention includes a photoreceptor, a means 8 for charging the photoreceptor, means 2 ₁ , 2 ₂ to 5 for exposing the charged surface of the photoreceptor to light corresponding to a recorded image, and developing an electrostatic latent image generated by the exposure. In the recording apparatus, the device cover 26 includes means 11 for feeding the recording paper toward the photoconductor and paper feeding/discharging means for discharging the recording paper from the photoconductor to the outside. Paper detection means 32 ₁ to 32 ₆ for detecting paper; abnormality detection means 33 for detecting an abnormality in the conveyance of the recording paper based on the detection signals of the paper detection means 32 ₁ to 32 ₆ ; at least a part of the conveyance path of the recording paper; illumination light sources 24, 17; device cover 2;
opening/closing detection means 27 for detecting the opening of 6; and energizing the illumination light sources 24, 17 in response to both the abnormality detection means 33 detecting an abnormality in recording paper conveyance and the opening/closing detection means 27 detecting that the cover is open. Energizing means 50
₂ , 51;

Note that symbols inside brackets indicate corresponding elements in the embodiments shown in the drawings and described later.

[Effect]

When a paper jam occurs in the recording paper conveyance path, the abnormality detection means 33 detects an abnormality in the recording paper conveyance based on the detection signals from the paper detection means _{32 1} to 32 ₆ . When the operator opens the device cover 26 in response to this, the opening/closing detection means 27 detects that the device cover 26 is opened. As a result, both the detection of recording paper conveyance abnormality and the detection of cover opening are established, and in response, the energizing means 50 ₂ and 51 energize the illumination light sources 24 and 17. Therefore, when the operator opens the device cover 26 in response to the paper jam, the illumination light source 2
4 and 17 are lit to illuminate at least a portion of the recording paper conveyance path. This illumination allows the operator to easily see the jam paper at that location. Also, after removing the jam paper, you can carefully check whether any small pieces remain.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 mainly shows the mechanical system configuration of an embodiment of the present invention. This embodiment is an electrophotographic copying machine. The document on the contact glass 1 is illuminated with light from illumination lamps 3 ₁ and 3 ₂ via rotating mirrors 2 ₁ and 2 ₂ . The reflected light from the original is projected onto a sheet-like photoreceptor wound around a drum 7 through a lens 4 and mirrors 5 ₂ and 5 ₂ .

The lens unit 4 and mirrors 5 ₁ and 5 ₂ are each mounted on a carriage, and are driven in the directions of arrows A _{4 to A 5 or in the opposite direction depending on the designated magnification, and are driven in the direction of the arrows A 4} to _{A 5} or in the opposite direction corresponding to the designated magnification. positioned in position.

The photoreceptor of the drum 7 is uniformly charged by a charging charger 8. Charges other than the recording width are removed by the erase lamp 9. The charged surface is exposed to image light directly below the slit 6, and a latent image is formed there.

The potential of the latent image surface is detected by an electrometer 10, the developing bias potential in the developing device 11 is controlled based on this detected potential, and toner is applied to the latent image while passing through the developing device 11 section. The surface of the photoreceptor developed with toner advances below the transfer charger 13. Recording paper PR is fed under the transfer charger 13 in synchronization with the image position on the photoreceptor surface, where the toner image is transferred to the recording paper.
Transcribed to PR. The recording paper bonded to the drum surface during transfer is peeled off by a conductive belt 14 to which a voltage is applied in time with the arrival of the recording paper, and is conveyed and sent to a fixing device 15 where it is subjected to heating and pressure treatment. , is discharged outside the machine (sorter).

After the transfer, the surface of the photoreceptor is neutralized by a static eliminating lamp 17 and a static eliminating charger 16, and cleaned by a cleaning device 18.

This copying machine includes three paper feed trays 19 ₁ to 19 ₃ ,
Intermediate tray 20 for double-sided copying, recording paper reversing device 2
1. A discharge path switching lever 22 and a conveyance/switching device 23 are provided.

Photo sensors 32 ₁ to 32 ₆ for detecting paper are arranged at key points on the paper conveyance path, and lamps 24 for interior lighting are installed at positions that can illuminate almost all parts of the paper conveyance path. .

An opening is formed in the outer case of the static elimination lamp 17 in order to illuminate the area where the recording paper separated from the drum is transported.

FIG. 2 shows the front cover portion of the copying machine shown in FIG. 1. The cover door 26, which is opened for inspection, consumable supply, and jam paper removal, includes a
Normally closed switch 27 fixed inside the front cover
An arm 28 is fixed thereto which opens when the door is closed. Therefore, when the cover door 26 is closed, the switch 27 is open, and when the door 26 is open, the switch 27 is closed.

A slightly enlarged view of the case of the static eliminating lamp 17 is shown in FIG. Separation belt 14 (first
An opening 9a for illuminating the recording paper separation section is provided on the side surface facing the side surface (FIG.), and when the lamp 17 is turned on, the recording paper separation section is illuminated.

FIG. 4 shows a combination of the central control unit and main control electrical elements of the copying machine shown in FIG. The central control unit includes a 1-chip microcomputer 33 and a ROM 3 with input/output ports.
4 ₂ and RAM 34 ₁ , and includes a microcomputer 33, a pulse oscillator 35, photo sensors 30, 31, a zero cross detection circuit 36,
Reset circuit 37, copy allowed (blue) indicator lamp 3
8 ₁ , Copy not allowed (red) indicator lamp 38 ₂ and 2
A digit 7 segment display 39 is connected. Each element is similarly connected to the input/output ports of the ROM 34 ₂ and RAM 34 ₂ . 40 indicates key contacts and contact pieces of the keyboard; 41 ₁ to 4;
1 ₂ is an indicator lamp, 42 ₁ to 42 ₃ is an indicator lamp, 45 ₁
45 ₁₆ are control output terminals, 32 ₁ to 32 ₆ are photo sensors for detecting paper jams, 32 ₅ is for detecting paper separation, 32 ₁ is for detecting paper feed in the upper and intermediate trays, and 32 ₂ is for detecting paper feed in the middle tray. 32 ₃ is for detecting lower paper feed, 32 ₄ is for detecting paper arrival at the registration roller, and 32 ₆ is for detecting paper ejection.

In addition, among the amplifier displays (triangles) in the figure, those with a double line on the upper side represent a Darlington connection of two NPN transistors, and those with a double line on the lower side represent a Darlington connection of two PNP transistors. Darlington connections are shown.

When the input terminal of the reset circuit 37 becomes a high level "1", the relay connected to the terminal ₃₇₁ is energized, turning on the power to each part of the DC circuit, and when it becomes a low level "0", it is cut off and ,33,
34 ₁ and 34 ₂ are reset.

Internal ROM of microcomputer 33 and
The _ROM342 has fixed program data that responds to signals sent from the keyboard and sensors in various parts of the mechanism, latches, reads, and displays their state changes, and advances the control sequence, as well as constant data that is referenced therein. It has been memorized. Hereinafter, only the parts related to the present invention will be explained.

Based on the program data, the microcomputer 33 starts the copying operation on the condition that the print key is pressed, and feeds the recording paper in a predetermined sequence, so that the normally fed recording paper is detected by the sensor 3.
If they do not generate a paper detection signal at the timings detected at 2 ₁ to 32 ₆ , it is assumed that the recording paper has jammed, and the copying sequence is stopped there and a paper trouble signal is output. This paper trouble signal instructs the indicator light 41 ₅ to turn on and makes the second transistor switching circuit 50 ₂ conductive.

In this embodiment, as _shown in FIG.
Since the transistor switching circuit 50 ₁ is connected and the connection between 17 and 50 ₁ is connected to the second switching circuit 50 ₂ through the diode 51, the second switching circuit 50 ₂ becomes conductive due to the paper trouble signal. When the door 26 is opened and the switch 27 is closed, the static elimination lamp 17
Current flows through both the lamp 24 and the internal lighting lamp 24, and the interior of the copying machine is illuminated. When the door 26 is closed, the switch 27 is opened and the lamps 17 and 2 are turned on.
4 disappears. The opening/closing of the door 26 is read by the microcomputer 33 through the input port of the ROM 34 ₂ , and when the door is opened for reasons other than paper trouble, the door is opened for inspection, cleaning, consumable supply, photoreceptor replacement, etc. of the high-voltage power supply, etc. Shut off hazardous power. In the event of paper trouble, the copying operation is stopped and all power supplies related to copying control are cut off.

In this embodiment, as described above, when a paper problem occurs and the door 26 is opened, the static elimination lamp 17 and the in-flight lighting lamp 24
is lit. In addition, the microcomputer 33
turns on the static elimination charger with a certain delay from the start of transfer, and applies a static elimination energizing signal to the first switching circuit ₅₀₁ to make it conductive and cause the exposure lamp 17 to emit light.

In addition, in the above embodiment, the static elimination lamp 17
Although the additional lamps 24 and 24 are used as light sources for illuminating the paper conveyance path, either one may be used as long as the required areas are illuminated, or other lamps may be added to the required areas in the same way as 24. good.

[Effect of idea]

When the operator opens the device cover 26 in response to the paper jam, the illumination light sources 24 and 17 are turned on, illuminating at least a portion of the recording paper conveyance path.
This illumination allows the operator to easily see the jam paper at that location. Also, after removing the jam paper, you can carefully check whether any small pieces remain.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a mechanical section of an embodiment of the present invention. FIG. 2 is a reduced perspective view showing the external appearance of a part of the copying machine shown in FIG. Figure 3 shows
2 is an enlarged sectional view of the static elimination lamp 17 shown in FIG. 1. FIG. FIG. 4 is a block diagram showing the configuration of an electric circuit section of the copying machine shown in FIG. 1. 1: Contact glass, 2 ₁ , 2 ₂ : Rotating mirror, 3 ₁ , 3 ₂ : Illumination light, 4: Lens, 5 ₁ , 5 ₂ :
Mirror, 6: Slit, 7: Drum, 8: Main charger (means for charging the photoreceptor), 9: Erase lamp, 10: Electrometer, 11: Developing device (means for developing the electrostatic latent image), 13 :Transfer charger,
14: Separation belt, 15: Fixing device, 16: Static elimination charger, 17: Static elimination lamp (illumination light source), 1
8: Cleaning device, 19 ₁ to 19 ₃ : Cassette, 20: Intermediate tray, 21: Reversing device, 22:
Switching lever, 23: Transfer/switching device, 24: In-flight lighting lamp (illumination light source), 26: Cover door (equipment cover), 27: Door switch (opening/closing detection means), 28: Arm, 29: Case, 29a: Opening , 30, 31: Photo sensor, 32 ₁ to 32 ₆ :
Photo sensor (paper detection means), 33: Microcomputer (abnormality detection means), 36: Oscillator, 3
6: Zero cross pulse oscillator, 37: Reset circuit, 38 ₁ , 38 ₂ , 41 1 to 41 ₅ , 42 _{1 to} 42
₃ : Display lamp, 39: Character display, 40: Switch, 37 ₁ , 45 ₁ to 45 ₁₆ : Terminal, 50 ₁ : Switching circuit, 50 ₂ : Switching circuit, 51: Diode (50 ₂ , 51: Current-carrying means) ).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A photoreceptor, a means for charging the photoreceptor, a means for exposing the charged surface of the photoreceptor to light corresponding to a recorded image, a means for developing an electrostatic latent image produced by the exposure, and ,
In a recording apparatus that includes a paper feed/discharge unit in a device cover that supplies recording paper toward a photoconductor and discharges the recording paper from the photoconductor to the outside, a paper detection unit that detects recording paper in a conveyance path of the recording paper. an abnormality detection means for detecting an abnormality in the conveyance of recording paper based on a detection signal of the paper detection means; an illumination light source that illuminates at least a part of the conveyance path of the recording paper; an opening/closing detection means for detecting the opening of the device cover. and energizing means for energizing the illumination light source in response to both detection of a recording paper transport abnormality by the abnormality detection means and detection of cover opening by the opening/closing detection means. . (2) The above-mentioned utility model registration claim No. 1, wherein the illumination light source is a static elimination lamp that eliminates static electricity from the photoreceptor.
Recording device described in (1). (3) The above-mentioned utility model registration claim 1, wherein the illumination light source is a static elimination lamp that neutralizes the static electricity on the photoreceptor and at least one other lamp for illuminating the inside of the device.
Recording device described in (1).