JPS62109037A - Copying device - Google Patents

Abstract

PURPOSE:To satisfactorily deal with setting just before the start of original scanning by stopping the original scanning and resetting the position relation between an original platen and light source to the condition at the start of the original scanning then restarting the original scanning when the detected relative moving speed does not coincide with a set adequate moving speed. CONSTITUTION:Two microswitches MS3, MS4 are fixed to part of a body corresponding to the original platen. The time between the prescribed two points during the advance (between the fall signal and rise signal of the microswitch MS4 for detecting the position of the original tray in this case) is measured when a command for advance of the original platen is emitted. Judgement is made to determine if the measured speed coincides with the set speed and if the set mode belongs any or ordinary 4 modes. Judgement is made to determine whether the speed of the discriminated mode is the same as the speed of an unmagnification mode if the measured speed does not coincide with the set speed. The original platen is retreated and returned to the start position and the speed is reset to the speed of the mode selected by the operator if the above-mentioned speed is not the same.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus that copies an original image by scanning the original.

[Conventional technology]

Generally, this type of device scans the document by moving the document table or light source. For example, in the case of a copying device that moves the document table, when the magnification is changed, the speed change gear changes accordingly. The documents are exchanged, and the document glass moving speed changes.

[Problem that the invention seeks to solve]

However, the transmission gear is changed while this gear is in a neutral state (for example, when the document table is moving backwards or stopped in a copying device with a moving document table), and the document table is moved just before document scanning starts. There is a problem in that the desired copying operation cannot be performed because changes in speed settings cannot be handled.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a copying apparatus that can reliably perform a copying operation even if the speed setting is changed immediately before the start of document scanning.

[Structure of the invention]

The copying apparatus of the present invention detects a specific relative position section using a position detection means that detects the relative positional relationship between the document placement table and the document irradiation light source, and detects the relative positional relationship between the document placement table and the document irradiation light source in this section. The target moving speed is detected by the speed detecting means, and if the detected speed does not match the preset appropriate moving speed, the control means returns the positional relationship between the document table and the light source to the document scanning start state, and then This is to control to start document scanning again.

[Effect]

In this invention, in an abnormal state in which the relative movement speed detected by the speed detection means does not match the preset appropriate movement speed, the document scanning that has already been performed is stopped, and the document table and the light source are moved again. After returning the positional relationship with the document to the original scanning start state, document scanning is started again, so it is possible to fully deal with settings made immediately before starting document scanning, and perform the desired image processing. It becomes possible to obtain.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of the copying machine applied to this embodiment, and FIG.
The cross-sectional views are shown in the figures.

In the figure, la is a document mounting table made of a transparent member, and the document is placed on it! A suppressing plate 1b is provided to be fixed on the placing table 1a, and the document table 1 made up of both is moved forward in the direction of arrow F or backward in the direction of arrow R. As the document table l moves forward, the document image reflected by the halogen lamp LAI, which serves as a light source for illuminating the document placed on the document storage table 1a, is slit-exposed onto the photosensitive drum 3 by the imaging lens 2.

Further, the imaging lens is moved to a position corresponding to the magnification set in advance by the variable magnification setting dial 4.

Further, before the slit exposure, the photosensitive drum 3 is uniformly charged by a charger 5, and an electrostatic latent image is formed on the photosensitive drum 3 by the slit exposure. Toner is attached to the electrostatic latent image of ε by the developing device 6, and the image is visualized.

On the other hand, the transfer paper P stored on the paper feed tray 7 is conveyed toward the registration rollers 10 by the paper feed roller 9 when the copy switch 8 is pressed. At this time, the drive motor 8 rotates in response to a copy start command from the copy switch 8, and the paper feed solenoid milk 4 is energized to transmit the rotation to the paper feed roller 9. A cam (not shown) provided coaxially with the paper feed roller 9 moves the paper push-up member 11 upward, and presses the transfer paper P against the paper feed roller 9. As a result, only the uppermost transfer paper P among the stored transfer papers P passes between the separation pad 12 and the paper feed roller 9, and is conveyed to the registration roller 10. A paper feed sensor 13 for detecting the transfer paper P is provided in the conveyance path between the registration roller 10 and the paper feed roller 9.
When the paper feed sensor 13 detects the leading edge of the transfer paper P, the registration roller IO is stopped after a certain period of time has elapsed. At this time, the transfer paper P has reached the registration roller 10. After this.

When a registration signal is applied to the registration solenoid SL3, the registration roller 10 starts rotating at a predetermined timing, and the transfer paper P is conveyed to the photosensitive drum 3. The registration roller IO continues to rotate until the transfer paper P is no longer present thereon. The toner image formed on the photosensitive drum 3 by the above-described operation is transferred onto the transfer paper P conveyed from the registration rollers 10 by the transfer charger 14 . After that, the transfer paper P separated by the separation belt 15 is
The toner image on the transfer paper P is guided to the fixing device 17 by the guide 16, and the toner image is transferred to the fixing roller 1 having a built-in halogen heater H1.
8 , and is discharged onto a paper discharge tray 20 by a paper discharge roller 19 .

Furthermore, residual toner is removed from the photosensitive drum 3 by the toner cleaner 21 after the above-described transfer operation is completed, and the photosensitive drum 3 is prepared for reuse.

Note that Q3 in the figure is an optical or mechanical paper ejection sensor, which outputs a detection signal by detecting the transfer paper P. THI is a thermistor that detects the temperature of the fixing roller 18 in the fixing device 17. A cooling fan 22 discharges heated air inside the copying apparatus to the outside.

Further, a rack (not shown) is fixed to the lower part of the storage table 1a according to this embodiment, and the storage table 1a is moved in the F or R direction by rotating a pinion that meshes with this rack. This control is performed by controlling a forward clutch and a reverse clutch by a document table stop solenoid SLI and a document table advance solenoid SL2, and transmitting the rotation of the motor 8 to a pinion via these clutches. Further, when a magnification is set using the variable magnification setting dial 4, a moving mechanism (not shown) is operated by a motor 8 in accordance with the magnification to move the lens la. Furthermore, two microswitches MS3. MS4 is fixed, and this microswitch MS3. MS4
The cam c1. C2,03,C4,C5
, CB are fixed on the storage stand 1a.

Figures 3 (A), (B), and (C) are diagrams showing the arrangement of the cams CA, C2, C3, C4, C5, and CB and the operation of the microswitches according to each magnification. Corresponding to the reversing cam 04. A home position cam C1, a registration cam C2, and a start position cam C3 are provided corresponding to the microswitch MS4. The relationship between this cam and switch is shown in Figure 3 (
To explain each of A), (B), and (G) using a to h, in the enlarged mode of FIG. When S4 separates from cam C1 and microswitch, and microswitch MS4 changes from ON to OFF (microswitches MS3 and MS4 turn ON when pressed by the cam), solenoid SLI is set to 0NL (only when copying is complete), and final copying is completed. Start output accumulation jam check.

Next, as shown in b, when the micro switch MS3 is turned on, the halogen lamp LAI is turned on, and when the micro switch MS4 is also turned on, the document platen stop solenoid SLI is turned on.

Next, as shown in C, the mounting table 1a moves forward in the direction of arrow F, and when the microswitch MS3 is turned from ON to OFF, the manual paper feed solenoid is turned ON. As roughly shown in d, when the microswitch MS4 is turned from OFF to ON,
Turn on the registration roller solenoid, switch the developing bias to image mode according to the value of the copy speed lever, and start the timer that determines the ON time of the registration roller solenoid SL3. Turn SL3 OFF and start checking the temporary output purge jam during continuous copying (excluding the final copy).

As shown in e, microswitch MS4 is turned on.
No operation is performed in the OFF state.

Also, as shown in f, the microswitch MS3 is turned OFF.
When it turns ON, the document platen solenoid is turned OFF, the movement direction is reversed, the halogen lamp LAI is turned OFF, the paper feed solenoid SL4 for the second and subsequent sheets is turned ON (for continuous copying), and the development bias switching timer is turned on. When this timer times up, the developing bias is switched to non-image, and an output delay jam check is performed.

In addition, in this enlargement mode, no operation is performed in the g and h states, and in the case of continuous copying, the a
- Repeat the control of h.

Next, the states of a to h in the same magnification mode in FIG. 14B will be explained. As shown in a, the storage stand 1a begins to move backward (in the direction of arrow R), the cam CI and the microswitch MS4 separate, and the microswitch MS4 turns from ON to OFF (the microswitches MS3 and MS4 turn ON when pushed by the cam). Then, turn on document platen stop solenoids St and l.
(However, only at the end of copying), output 17i of final copy
2i jam check starts.

Next, as shown in b, when the microswitch MS3 is turned on, the halogen lamp LAI is turned on, and when it is turned on together with the microswitch MS4, the document platen stop solenoid SLI is turned on.

Further, as shown in C, when the mounting table 1a moves forward in the direction of arrow F and the microswitch MS3 is turned from ON to OFF, the manual paper feed solenoid is turned ON. Next, as shown in d, when the microswitch 1lIs4 is turned from OFF to ON, the registration roller solenoid is turned ON after a predetermined period of time, the developing bias is switched to image use according to the value of the copy density lever, and the ON time of the registration roller solenoid is determined. Then, when the timer times up, the registration roller solenoid SL3 is turned OFF.
Starts a temporary output purge jam check for continuous copies (excluding the last copy).

Then, as shown in e, no operation is performed when the microswitch MS4 is in the ON to OFF state.

Next, as shown in f, the microswitch MS3 is turned OFF.
When it turns ON, the document table solenoid is turned OFF, the movement direction is reversed, the halogen lamp LAI is turned OFF, and the paper feed solenoid SL4 for the second and subsequent sheets is turned ON.
(in the case of continuous copying), and then starts the developing bias switching timer, and when this timer times up, the developing bias is switched to non-image, and an output delay jam check is performed. Note that g and h are It doesn't do anything.

After this, in the case of continuous copying, the control from a is returned again.

Next, to explain the reduction modes a to h in FIG. When this happens, turn on the document platen stop solenoid l.

(However, only at the end of copying), starts the output accumulation jam check for the final copy.

Next, as shown in b, when the microswitch MS3 is turned on, the halogen lamp LA1 is turned on, and when both the microswitches MS4 are turned on, the document table solenoid SLI is turned on.

Next, as shown in C, the mounting table moves forward in the direction of arrow F, and when the microswitch MS3 turns from ON to OFF, the manual paper feed solenoid SL4 is turned ON. When the microswitch MS4 is turned from OFF to ON as shown in d, the registration roller solenoid SL3 is turned ON after a predetermined period of time, the developing bias is switched to that for images according to the value of the copy density lever, and the registration roller solenoid SL3 is turned on. Start the timer that determines the ON time, then turn off the registration roller solenoid SL4 using the timer's time amplifier, and start checking the output accumulation jam during continuous copying (excluding the final copy), as shown in e. Thus, no operation occurs when the microswitch MS4 is in the ON to OFF state.

Next, as shown in f, the microswitch MS3 is turned OFF.
When it turns ON, the document table solenoid is turned OFF, the movement direction is reversed, and the paper feed solenoid SL4 for the second and subsequent sheets is turned OFF.
is turned on (in the case of continuous copying), and a developing bias switching timer is started, and when this timer times up, the developing bias is switched to non-image, and an output delay jam check is performed.

Next, when the microswitch MS3 changes from ON to OFF as shown in 1g, the halogen lamp LAI is turned OFF.
shall be. Note that no operation is performed at h.

After this, in the case of continuous copying, control of a to h is repeated again.

FIG. 4 is a control circuit block diagram of the copying machine shown in FIG. 1. In FIG.
It is. Note that an A/D converter may be added outside the control section.

Also, as a power supply, is it a household AC? By inputting the Li source to the power supply circuit 200 via the transformer T1, 24V and 9V are generated as a DC power supply. Mainly, the AC power source enters the interrupt program at the rising edge of the zero-cross pulse 521 input to the main motor INT terminal. Roughly speaking, at the Jl terminal, 50,760 Hz is distinguished by counting the number of zero-cross pulses input within a predetermined time using an internal microcomputer program.

FIG. 4 is a diagram showing the configuration of a control system applied to this embodiment. In FIG. 0, K2. 4, K8 is connected to output ports (R11 to R13) via sensors, input keys, etc. That is, the input boat Kl has a minus key 21a,
Clear/stop key 22d, variable magnification switch MS5, input boat 2, copy key 21C, plus key
21b, a magnification 2 switch MS6 is connected to the input port 4, and a paper discharge sensor Q3. A home position/back position (HP/BP) sensor M3, a jam killing sensor 47d, a paper feed sensor Q2, and a registration position sensor MS4 are input to the input capacitor K8. Further, RO-R13, R14, and QO-Q7 of the control unit Q203 are wired so that they can be independently controlled by output ports.

The output boat R1 has a paper feed solenoid SL4, the output boat R2 has a document table advance solenoid SL,2, the output boat R3 has a document table stop solenoid SL1, and the output boat R4 has a registration shutter solenoid SL3. The document lamp 48a is provided on the boat R5, and the document lamp 48a is provided on the output boat R6.
, a bias switching circuit 24 that enables image density adjustment using a density adjustment lever, a high voltage circuit HV on the output boat R7, a main motor Ml that drives the photosensitive drum 3, etc. on the output boat R8, and a main motor Ml that drives the photosensitive drum 3, etc. on the output boat R9. A halogen lamp LAI is connected to the output port RIO, a halogen heater H1 is connected to the output port RIO, and a jam indicator 48b is connected to the output port R11. Further, a segment display 46a is connected to the output boats QO to Q7.

By the way, when the document table 1a moves backward from the home position to the start position as described above (see Fig. 3),
When moving from state a to state b in A), the microswitch MS4 will output a rising signal that changes from OFF to ON twice as shown in the timing chart of Fig. 5, but the time between these signals is T1. is constant if the original table 1a is moving normally. However, if the rotational speed of the drive motor Ml changes due to a change in the power supply frequency used, the time T1 between the signals also changes accordingly. When used at a power supply frequency of , the number of rotations becomes 1.2 times higher, and conversely, when changed from 60 Hz to 50 Hz, the number of revolutions becomes 0.83 times higher. When the time T1 between signals changes in this way, the following malfunction occurs.

Namely.

1. Since the rotation time of the paper feed roller 9 (the time T2 from when the paper feed sensor Q2 is pressed until the paper feed plunger stops) is constant, the transfer paper may not reach the registration roller or may be transported longer than necessary. This will cause a paper jam.

2. Depending on the magnification of image processing, the registration roller 10 is rotated after a certain time T3 after receiving the registration signal for image tip alignment, so there is a deviation of 20% of this time.

3. Although the registration rollers 10 are rotated for a certain period of time T4, if the rotation of the drive motor Ml is slow, an inconvenient phenomenon such as the transfer paper P remaining on the registration rollers 10 and not being conveyed occurs.

In order to prevent these, in this embodiment, the microcomputer Q 203 performs the operations shown in the flowcharts of FIGS. 6 to 8 based on the outputs from each sensor.

FIG. 6 is a flowchart showing the detection of whether the motor Ml is being driven in an appropriate state and the power setting operation for proper driving. First, in step 11, it is determined whether or not the copy switch 8 has been pressed, and if it has been pressed, the motor M1 is started to be driven (step 12), and further, whether or not the document storage table 1a is between the home position and the start position. (step 13), if the original table la is between each position, the micro switch MS4
Step 14)
, furthermore, the measured value and the value in a predetermined appropriate state (
As a result, if the measured value and the set value match, the process proceeds to step 16, and if they do not match (the IJ4 constant value is the set value). (if it is too short or too long).

After setting the abnormality flag (step 17).

Proceed to step 16. In step 16, it is determined whether the document placing table 1a is at the start position,
If it is not at the start position, the process returns to step 3 and repeats the same operation again until the document placement table 1a reaches the start position.In addition, if the document placement table 1a is already located at the start position before performing the above operation, No abnormality can be detected.

FIG. 7 is a flowchart showing the rotation time setting operation of the registration roller 10. First, it is checked whether a rotation start command for the registration roller 10 has been issued (Step 2 21), and if a rotation start command has been issued, it is further determined whether the currently input power frequency is 50 Hz or not. (Step 22).

If the frequency is 50Hz, check whether the abnormality flag was set in step 17 of FIG. 6 (step 23), and if it is not set, set the normal time T41 as the time T4 to be set in the timer. Step 24), if the abnormal flap is set, the timer indicates a time T41X longer than the normal time 101T41.
1.2 (step 24). In other words, if the abnormality flag is set when the power supply frequency used is 50Hz, the power supply frequency of the motor M1 currently in use is 60Hz, and the rotation is too slow. By setting the pressure to .2, the transfer paper P is conveyed at an appropriate pressure. Furthermore, if it is determined in step 22 that the currently input power supply frequency is 60 Hz, it is further determined in step 26 whether or not an abnormality flag is set, and if the abnormality flag is not set. If the timer indicates the normal time T42
If the abnormality flag is set, set the timer to a time T42Xo,83 that is shorter than the normal time T4 (step 28), that is, when the power supply frequency used is 60Hz. If the abnormality flag is set, the power frequency of the motor Ml currently in use is 50H2, and the rotation speed is too fast, so the timer setting time is changed to T41Xo,
83, the transfer paper can be conveyed at an appropriate pressure.

Further, the rotational speed of the motor Ml and the reversal position (original scanning pressure #) of the original storage table 1a are set according to the copy mode. In the copying apparatus applied to this embodiment, the microcomputer Q 203 issues a command to set the reverse position of the document storage table 1a based on a combination of operations by the variable magnification switch MS5 and the variable magnification switch MS6. On the other hand, the moving speed of the document storage table 1a can be independently and mechanically set regardless of the microcomputer Q203. For this reason, copy modes include a special A mode and a special B mode in addition to the well-known enlargement mode, same-size mode, 87% reduction mode, and 71% reduction mode. This special A mode is a mode in which the document table moving speed is the same as in the normal magnification mode, and the document table inversion position is the same as in the enlargement mode. In addition, in the special B mode, the document table moving speed is the same as the original magnification mode, and the document table inversion position is in the reduced mode (87
% reduction or 71% reduction mode).

FIG. 8 is a flowchart showing the movement control operation of the original platen 1a performed according to the set image processing mode. First, when a document platen advance command is issued, the document platen 1a
starts moving forward (step 31φ32), measures the time between two predetermined points (in this case, between the falling signal and rising signal of the microswitch MS4 for detecting the position of the original platen), step 33), I ! 4. It is determined whether the fixed document table moving speed is the same as the speed of the enlargement mode, the same-size mode, the 87% reduction mode, or the 71% reduction mode (step 34). After this, it is determined whether the mode determined in step 35 matches the set mode, that is, the measured speed matches the set speed, and the set mode is normal. If they match, the process moves to step 42 to output a registration signal, and if they do not match, the speed of the mode determined as 1 in step 36 is determined as the speed of the 1x mode. It is determined whether the speeds are the same or not. If the speeds are not the same, the document mounting table 1a is moved backward and returned to the starting position, and then the speed is reset to the speed of the mode selected by the operator (steps 37 to 39). ), it is also possible to reset the speed not only after returning to the starting position as described above, but also while moving backward or while the vehicle is stopped. On the other hand, if it is determined in step 36 that the speed of the determined mode is the same as the speed of the normal magnification mode, the magnification set in step 40 is set to 8.
It is determined whether the image is reduced or enlarged by 7%. That is, it is determined whether the set mode is the same magnification mode or the special mode. If it is determined that the set mode is the same magnification mode, the process moves to step 37.

If it is determined in step 4o that the mode is special, the registration time T3 is changed to equal borrowing (step 41), and a registration signal is output (step 42). The registration time T3 in this step order 2 is the time from when the registration signal is output until the registration roller is rotated, and this time T3 is set as follows, for example, depending on the set magnification.

That is, Enlarge ・・・・・・0 seconds Same size...60m seconds 87% reduction...Loom seconds 71% smaller...150ms is set to

Therefore, in the case of special mode, the magnification is enlarged or 87
Since it is a % reduction, the registration time T3 is 0 seconds or 1
Set to 00ms. However, the document table moves at the same speed as in the same magnification mode, and if the copying operation is continued, the leading edge of the visible image formed on the photosensitive drum 3 and the leading edge of the transfer paper P will not match. It has been transcribed,
For example, an image with too much blank space at the leading edge of the paper will be formed. Therefore, if the special mode is determined in step 40, the registration time is reset to the same magnification mode in step 41, so that the leading edge of the visible image and the leading edge of the transfer paper P are aligned. .

As described above, in this embodiment, the moving speed of the document storage table 1a of the document table moving type copying device is detected, and it is determined whether or not the moving speed matches the speed of the set mode. By performing the determination operation in 36 and 37 and the setting operation in step 41, the well-known 4 modes (
Enlarged 9 times.

In addition to the special mode (87% reduction, 71% reduction mode), it is possible to accurately detect copy operation abnormalities. It goes without saying that ゜40.41 can be deleted.

In the above embodiment, a copying apparatus with a movable document table is used, but the present invention can be applied not only to a copying device with a moving document table but also to a copying device with a fixed document table. In this case, the speed of the moving light source for scanning the document may be detected.

〔effect〕

As described above, according to the image forming apparatus of the present invention, it is possible to sufficiently cope with speed setting changes made immediately before the start of document scanning, and it is possible to obtain the desired image processing operation.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a copying apparatus applied to an embodiment of the present invention, FIG. 2 is a side view schematically showing the internal structure of the copying apparatus shown in FIG. 1, and FIGS. 3 (A) and (B). , (G) is an explanatory side view showing the moving state of the document storage table shown in FIG. 2 and the relationship between the microswitch and the cam in each state;
A) shows the image in enlarged mode, and (B) shows the image in normal magnification mode.
The figure (C) shows the reduction mode. 4rgJ is a block diagram showing the control system of the device shown in FIG. 2, FIG. 5 is a timing chart showing the operation timing of the device shown in FIG. 4, and FIG. 6 is an abnormality detection of the driving state of the motor in this embodiment. FIG. 7 is a flowchart showing the operation for setting the rotation time of the registration rollers, and FIG. 8 is a flowchart showing document scanning control. 1a... Original storage table LAI... Halogen lamp 3 as a light source for irradiating the original
...Photosensitive drum P...Transfer paper third defect λ Fig. 3

Claims (1)

[Claims] A copying apparatus configured to scan an original by relatively moving an original placing table and a light source for illuminating the original, the copying apparatus comprising: a position detection means for detecting a relative positional relationship between the original placing table and the light source; a speed detection means for measuring the movement time in a specific movement section detected by the detection means and detecting the document scanning speed; 1. A copying apparatus comprising: a control means for controlling the positional relationship of the two to return to a document scanning start state.