JPS6211845A - Copying device - Google Patents

Abstract

PURPOSE:To return automatically an original platen to its initial position, when a power source is off, by executing a control for returning the original platen to the initial position, and thereafter, turning off the power source, when the instruction of the power source-off is given. CONSTITUTION:When an exposure start is executed, an original platen 2 is moved in the direction B, an original is scanned and an exposure to a photosensitive drum is started. While this original platen 2 is being moved, a microswitch MSW1 carrying a form by synchronizing with the rotation of the photosensitive drum is operated. After this microswitch MSW1 is operated, the original platen 2 is further moved in the direction B, and the microswitch MSW1 is started again by a detecting plate 20c for detecting an overrun state by which the movement of the original platen 2 is stopped. Thereafter, the original platen 2 is returned to the initial position and stopped at that position. Also, when the instruction of a power source-off is given, said platen is returned to the initial position by the detecting plate 20c and the microswitch MSW1.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an improvement in a copying apparatus that performs copying by reciprocating a document table and performing constant scanning.

<Prior Art and Its Disadvantages> In a copying machine that performs copying by reciprocating the document placing table to perform scanning, the document placing table is moved from the home position and the document placing table is moved in order to replace and clean the developing device. It is also being moved. After performing such an operation, if the original table is left without being returned to its original position, the next person making a copy will not be able to use it immediately. In addition, when storing or covering the document after turning off the power, the document tray is not in its initial position, so the operator must move the document tray and return it to its initial position before performing these operations. There was a need.

<Object of the Invention> An object of the present invention is to provide a copying apparatus in which when the original table is not at the initial position, the position is automatically returned to the initial position by turning off the power. .

<Structure and Effects of the Invention> To summarize, the present invention includes a position detection means for detecting the position of a document mounting table, a means for detecting a power-off instruction, and
When this instruction to turn off the power is detected, the position detection means detects the position of the document placing table, and if the document placing table is not at the initial IIJJ position, control is performed to return the document placing table to the initial position. , the device is characterized by having a means for turning off the power after that.

According to this invention, the original table is moved -l! Even after replacing the developing device, replenishing developer, or cleaning the photoelectric transfer body and document mounting table, even if you turn off the power sluggishly without returning the document mounting table 1a to its original position, the document will not be placed. After the document placement table is returned to its initial position (1 position), the power is turned off, so there is no need to return the document placement table to its initial position, and it can be used immediately for the next use. When placing a cover or placing a cover, the document placement table has already returned to its initial position, so there is a risk that excessive external force may be applied to the document placement table and its driving part due to careless handling. It disappears.

<Embodiment> FIG. 1 is a front sectional view showing a schematic structure of a copying apparatus which is an embodiment of the present invention.

d) Approximately in the center of the apparatus main body 1, a photoconductor ['ram 4] is provided, and outside it, a charger 5, a developing device 6, a transfer charger 7, a cleaner 8, and a static eliminator 9 are disposed.
A copy process section is configured.

On the negative side of the main body I of the copying apparatus, an original table 2 is constructed of a hard transparent material such as a glass plate. The light source 18 scans the document placed on the document table 2, and the reflected light passes through the light converging body 3 and hits the surface of the photoconductor tram 4 at a point 1'4 in the figure.
Light is distributed as shown by the lines.

The photosensitive drum 4 moves the arrow FIC in synchronization with the scanning of the document table.
direction, and its surface is uniformly charged with a single polarity charge by the electromagnetic charger 5. ”-Charged Charsha 5
The light beam from the original f high exposure light source 18 is distributed onto the surface of the photoreceptor tram 4 which has passed through the position , forming an electrostatic latent image.

Next, a developer charged with a polarity opposite to that of the charger is supplied to the surface of the photoreceptor by the developing device 6, and the electrostatic latent image is visualized. The image visualized by this developer is transferred onto the paper surface fed from the paper cassette 11 or 12 at the position of the transfer chart.

The paper is led to the fixing device 15 via the paper conveyance path 14, and after the transferred paper is heated and pressurized and fixed,
The paper is discharged to the paper discharge tray 16. The surface of the photosensitive drum 4 that has passed the transfer charger 7 has residual developer removed by a cleaner 8, and is then neutralized by a static eliminator 9 to be rendered charge-free.

When the document table 2 moves to the position indicated by the broken line in the figure, an opening 10 appears on the -L side of the main body of the copying apparatus. This opening I1 is an opening [1] provided when the developing device 6 is replaced or for replenishing the developer to the developer replenishing port 6a of the developing device.

FIG. 2 shows the relationship between the main body and the document table.

The document table 2 is configured so that a copy document is placed on two parts thereof. When the copying machine is on standby, this document table 2 is used as 4)
It is in the initial position shown in . When the print switch for starting copying is operated in this state, it is moved in the direction and the microswitch MSW2 is activated at the rear part 20b of the detection plate 20 without indicating the exposure start position (original scanning start position). , the document table 2 stops at that position. This stop position is as shown in (2). The detection Fj, 20 for operating the micro-sinch MSW2 is provided on an example part of the moving document table 2, and this detection plate 2
It is placed at a position indicating the start of exposure on the movement path of No. 0.

Here, when the start of exposure is executed, the document table 2 is moved in the direction B, the document is scanned, and exposure of the photosensitive drum is started. During this movement of the document table 2, a microswitch MSW1 is activated to synchronize the paper with the rotation of the photoreceptor drum and start TA feeding. This micro spinch MS
The operation of W1 is performed at the front end 20a of the detection plate 20. Further, the microswitch MSWI is arranged at a position for starting conveyance of the paper along the movement path of the detection plate 20. After the operation of this microswitch MSWI, the document table 2 is further moved in the direction B, and the second detection plate 20c that detects the overrun state restarts the microswitch MSWI, thereby stopping the movement of the document table 2. do. This state is as shown in (3).

Thereafter, the document table 2 is moved to the initial position (1) and stopped at that position.

As described above, the detection plate 20c is a detection member for overrun prevention, and is also used to detect whether or not the document table 2 is at the initial position (hereinafter also referred to as home position).

FIG. 3 shows a block diagram of the control section of the copying apparatus. Overall control is by microprocessor MjU. SW is the various detection switch MS mentioned above.
WI, MSW2. The MSW 3 and switch switches for instructing on/off of the power supply, M, and PU perform processing according to the states by determining the states of these various switches.

DSC is a display control circuit, and drives the display body DIsp by writing contents to be displayed from the MPU. Ilo is an input/output control circuit, which operates the driver DPI of the power relay PR or the driver DR2 of the main motor relay MR in response to a signal from the MPU. This section 10 also drives other drive circuits and inputs other sensors. ROM is a memory that stores a processing program for the MPU in advance, and RAM is a memory that is used as a working area when executing the program.

FIG. 4 is a circuit diagram relating to various switches and the power supply circuit G. AC is a commercial power source of 100 V AC, and a DC power source is obtained by a power transformer and a DC power circuit, and the microprocessor M P tJ is operated by this DC power source. The microprocessor MPTJ is connected to the microswitches MSWI, MSW2, and MSW3, switches 0, N, and SW for instructing power-on, and switch 0FFSW for instructing power-off, respectively. PRa
is the coil of the power relay, and PRb is the relay contact of the power relay. When the microprocessors M and PU drive this power relay, PRb is turned on. Also, MRa is the main motor relay coil.

MRb is a relay contact of the main motor relay, and MRb is turned on when the microprocessor MPU drives MRa. If both PRb and MRb are on, the main motor M is driven by the commercial power supply AC. Note that LD1 is another load that operates together with the main motor, and LD2 is another load that operates when the power relay is in the on state.

As configured above, the microprocessor is RO
Control is performed according to a control program stored in M in advance. FIG. 5 shows the flowchart.

The microprocessor is normally in a HALT state, and if there is an interrupt caused by some kind of manual input or the like, the microprocessor determines the switch that caused the interrupt through interrupt processing, and performs processing accordingly. The same figure (A) shows the procedure. If the operated switch is an off switch (OFFSW), step n10 (
Interrupt input is prohibited at step ni (hereinafter referred to simply as ni). This is to prevent interrupts from occurring during the subsequent processing. Identify the micro switch MSW3 using rr 1.1! However, if the document table is not in the home position,
If the MSW 3 is in the position 3), the MSW 3 is off, and if it is off, the document table is driven toward the home position at n12. At n13, the state of the microsinch MSW3 is determined, and the document table is driven until it is turned on.
When the document table is located at the home position, MSW3 is turned on and the drive of the document table is stopped at n14.

In this way, the document table is returned to the home position. If the off switch is operated, it is already 6;C[fl
If MSW3 is at the home position, MSW3 is in the on state, so the process advances from nil to n15.

At n15, the coil PRa of the power relay is turned off to cut off the operation of the circuit operated by commercial power as shown in FIG. 4, and at n16, the display state is turned off. In other words, it displays that the power is off, or does not display anything at all.

Thereafter, at n17, the interrupt prohibition is canceled and interrupts are enabled and the state is set to IIAT,T. If you operate the off switch as described in -1- below, if the document glass is not at the home position at that time, the document glass will be returned to the home position, and then the power will be turned off.The above example shows how to operate the off switch. As an example, the on switch (O
When the microswitch MSW (N SW) is operated, as shown in FIG. 3(C), interrupts are first inhibited at n22, and the state of the micro-sinch MSW 3 is determined at n2]. The processing from n21 to n24 is the same as the processing from steps n1.1 to n14 described above, and if it is detected that the document glass is not at the home position, the document glass is driven, returned to the home position, and then stopped. conduct. The f&n 25 drives the coil PRa of the power relay to turn on the power relay. As a result, as shown in Fig. 4, a circuit powered by commercial power AC is created.

It will start operating. At n2+, a display indicating that the power is on is displayed, and at n2-i, the state is reset to interrupt disabled 1 to enable interrupts, and then at n28, the fixing device and other warming amplifiers are activated. Tsut
- When the copying is completed, a READY display is displayed at n29, indicating that copying operation is possible. Note that by enabling an interrupt before starting the warming amplifier, key input can be accepted even during the warming amplifier.

As described above, when the document glass is not in the Baum position, the document glass is first returned to the Baum position by turning the power switch on or off, and then the switch input is performed while the power is turned on or off. It is also possible to configure the circuits other than the detection circuit to turn on and off the power supply when the AC power supply is turned on and off.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view showing the schematic structure of a copying apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing the positional relationship between the document table and the main body, and FIG. FIG. 4 is a circuit diagram relating to the microprocessor, various switches, and a power supply circuit, and FIG. 5 is a flowchart showing the processing procedure of the microprocessor.

Claims (1)

[Claims] (1) A document placing table, a scanning means for reciprocating the document placing table, a position detecting means for detecting the position of the document placing table, a means for detecting an instruction to turn off the power, and a means for detecting the instruction to turn off the power. At the time of detection, the position of the document placing table is detected by the position detecting means, and if the document placing table is not at the initial position, the scanning means is operated to return the document placing table to the initial position, and then the power is turned off. 1. A copying apparatus comprising means for turning off.