JPS58105253A - Movement controller of optical placing plate in copying machine - Google Patents

Abstract

PURPOSE:To simplify a detecting device, and also to make it inexpensive, by constituting it so that the position of an optical placing plate is detected by a single detector, and a timing signal required for control is obtained. CONSTITUTION:On the home position side of an optical placing plate 4, a single position detector 7 is provided so that detection of the optical placing plate and its movement control are executed. In case when paper jam has occured in the previous copying, or the optical placing plate 4 has stopped at other place than a prescribed position by turning off an electric power supply, the optical placing plate 4 is moved by a specified distance in the scanning direction through the position detector 7 by a signal from a paper jam detector 23, a signal from an electric power supply turn-on detector 25, etc., the position of the optical placing plate 4 is detected, and after that, operation of the optical plate 4 is controlled. According to such constitution, the position of the optical placing plate is detected and runaway is prevented by the single position detector, therefore, the detecting device is simplified, and also it is made inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for detecting the position of an optical loading table in a copying machine in which the position of an optical loading table equipped with an exposure lamp etc. is detected by a single detector and the tinging required for control is obtained. Regarding movement control.

Conventionally, in a copying machine that scans an optical mounting base along the original to be copied, in addition to a detector that detects the position of the optical mounting base using a home positron, there is also a runaway prevention device that prevents the optical mounting base from going out of control. All detectors for this purpose are in good condition. As a result, there is a drawback that the number of detectors becomes plural, making the circuit complicated and expensive.This invention was made with the purpose of resolving this drawback.1. A movement control device for an optical table in a copying machine is provided, which detects the position of the optical table with a single detector and obtains a timing signal required for control, thereby simplifying the circuit. In addition, by prohibiting unnecessary movement of the optical mounting table, the moving distance can be minimized.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
In the figure, 1 is the main body of the copying machine, and 2 is a platen provided on the top of the main body 1, on which a platen 3 to be copied can be placed. Reference numeral 4 denotes an optical mounting table provided below the platen 2, which is reciprocated along the lower surface of the platen 2 by a driving means 5 such as an endless chain 5G and a clutch 5b that drives the entire chain. In addition, the original 3 on the platen 2 is placed on the optical mounting table 4.
An exposure lamp 6 is provided to expose the light, and a detected object 5C is protruded from the lower part of the optical mounting table 4 for detecting the position of the exposure mounting table 4 with a detector. As shown in FIG. 2, the detection II 7 is installed at a position where the optical mounting table 4 is moved a certain distance in the forward direction from the home position 8 where the direction of travel is reversed from the backward path to the forward path, and the circuit and operation will be described later. K is designed to detect and control the movement of the optical mounting table 4.

On the other hand, the reflected light from the nine originals 3 exposed by the exposure lamp 6 on the optical mounting table 4 is guided to the photoreceptor 10 via the optical system 9. Circumference sK of the photoreceptor 10
is charging @l l, developing device 12, paper feeding device! 3. Transfer device 1
4 and the cleaning device 16 are arranged in the above-mentioned order in the rotational direction of the photoreceptor 100, and the paper I to which the toner has been transferred from the surface of the photoreceptor 100 is fixed by the fixing device I8 and then delivered to the paper output tray 19. In front of the paper feeder 13, there is a paper detector 20 for detecting the paper 17 that is fed from the paper feed tray 131 to the photoreceptor 10 side, and also before and after the fixing device 18, the paper detector 20 Detectors 21, 22 are installed, and the signals detected by these detectors 20, 21, 22 are input to a paper jam detector 23. The above-mentioned paper jam] detection 4623 is the paper jam 9 which is driven by the detector 20.
22 is detected and outputted to the paper loading signal tube control circuit 24.
A signal from a power-on detector 25 for detecting power-on is also input together with a signal from a detector for detecting the position of the optical mounting table 4. In addition, the control circuit 22
The clutch 5b of the drive means 5 is connected to the output side of the drive circuit 26 via the loop drive circuit 26, and the rotation is controlled as follows. The optical mounting table 4 is stopped on the scan side (position detector 7), and when the copy start switch (not shown) is turned on, it is moved from that position to the return side and passes the position detector 7. and reaches home position 6. Next, exposure of the original 3 is started from the home position 8, and when it is suitable for the return point after scanning a predetermined distance, the scan clutch is turned off, the return clutch is turned on, and the optical mounting table 4 starts returning, and returns to the home position. Reach position 6.

In the case of continuous copying, the above-mentioned operation is repeated a predetermined number of times, and when copying is completed, the position detector 7 stops on the scanning side.

The above is the normal operation, but when the power is turned on and used, the operation is as follows.

When the power t of the copying machine main body 1 is turned on to perform copying, a signal from the power-on detector 25 is input to the control circuit 24. In response to the power-on signal, the control circuit 24 goes through the steps shown in FIG. 4 to determine whether a flag has been set in the memory storing the operation of the optical mounting table 4. If the flag is set, either a paper jam occurred during the previous copying or the power to the copying machine is turned off, so proceed to step (3) to determine whether the copying machine is operating. If the copying machine is in operation, proceed to step (2) and move the optical mounting table 4t a certain distance in the scanning direction. If the optical mounting table 4 is stopped closer to the home position 8 than the position detector f due to the case of the 9-paper stack 9 that occurred during the previous copying, the position detector f will be passed during this scan. Then, in step ■, determine the time t required for the first scan, and if the time t
When , has elapsed, proceed to step (2) and disengage the clutch 5h.

Furthermore, if the position detector 5h is passed in step (2) before the time t has elapsed, this is determined, and if it has passed, the clutch 5h is disengaged in step (2), and at the same time, the flag t7 is set.

As a result, even if the optical mounting table 4 is stopped at a position other than the normal position due to a paper jam or the power is turned off, the optical mounting table 4 will always be stopped at a fixed position on the scanning side of the position detector 7. . Note that the fixed distance for the first scan is set in advance to be larger than the distance l from home position 8 to position detection -7.

On the other hand, the control circuit 24 receives power-on signals, ma+a paper binding signals, etc.
When copying is not input, after the optical mounting table 4 scans and returns, the position detection 7
Since it stops at a predetermined position on the side of the copying machine, there is no need to detect the position of the optical mounting table 4 described above.
When the optical mounting table 4 is moved for maintenance, inspection and repair, etc., the following operation will be performed. In other words, since these inspections during repair are normally carried out while the copying machine main body 1 is stopped, it is determined in step (2) shown in FIG. 5 whether the copying machine is stopped, and if it is stopped, the If there is a change in the position detector 7, that is, if the position detector F operates, it is determined in step (2), and if there is a change, the process proceeds to step (2), where the flag volume of the memory for storing the operation of the optical mounting table 4 is set.

Therefore, when the copying machine is operated after maintenance or inspection/repair, the predetermined scanning operation is performed when the power is turned on, so that the optical loading platform 4 is stopped at a predetermined position on the scanning side from the position detector 7. K becomes.

Note that FIG. 116 is a tie-up chart showing the operation of each part when the optical mounting table 4 stops at a place other than the predetermined position.

As detailed above in this Letter of Invention, if a paper jam occurs during the previous copying, if the power is turned off and the optical mounting table stops at a location other than the predetermined position, the paper jam detector The optical loading table is moved a certain distance in the scanning direction (by a power-on signal during a signal, etc.), and the position of the optical loading table is detected, and then the operation of the optical loading table is controlled. A position detector can detect the position of an optical stand and prevent it from running out of control, and the detection device can be simplified and provided at a lower cost compared to the conventional method in which these tasks were performed using multiple detectors. You will be able to do this. Since the unnecessary repetition of scanning of the optical mounting table is reduced, wasted scanning time is suppressed and work efficiency is improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic diagram of a copying machine, Fig. 2 is a detailed view of the vicinity of the position detection section, Fig. 3 is a block diagram of the control system, Fig. 4 and Fig. S 116 is a flowchart showing the operation), and FIG. 116 is a tie construction chart. 2 is a platen, 4 is an optical mounting table, 6 is an exposure lamp, and 7 is a position detector. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] An optical mounting table 4 equipped with an exposure pump 6 etc. is mounted on a platen 2.
In the device that exposes the original on the platen 2 by reciprocating the original on the platen 2, a single position detector 7 is provided on the home position side of the optical mounting table 4, Detects the position of the optical mounting table 4 by using a power-on signal or a paper jam signal. Movement control device for the mounting table.