JPS60114844A - Picture formation device - Google Patents

Abstract

PURPOSE:To obtain high safety by detecting mode information from a mechanically set up lens position and sending the detected mode information to a control part. CONSTITUTION:The positioning of a lens 2 and the speed setting of an original board 1 can be modified to respective magnification modes by driving cams coupled with respective power modification setting dials. Since it is necessary to change the timing of feeding recording paper P to a photosensitive drum 3 and the scanning area of an original, i.e. the inverting position of an original board, a means setting up a selected magnification mode in a CPU, Q203 is required. Consequently, cams C7, C8 fitted to a lens base body 2b and microswitches MS5, MS6 connected to the CPU, Q203 are used to set up the magnification mode. and the CPU, Q203 executes the control means in respective magnification modes.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an image forming apparatus such as a copying machine, and in particular, in addition to the same-size mode in which image formation is performed without changing the size of the original image, the present invention also has a mode in which the magnification of the original image is changed. The present invention relates to an image forming apparatus having a variable magnification mode that performs image formation by changing the magnification.

[Prior Art] As a conventional image forming apparatus of this kind, for example, there is a copying apparatus which is provided with a mode switching dial, and when switching modes, an operator operates the dial to select a desired magnification mode. be. In such a copying apparatus, the position of the lens constituting the optical system of the copying apparatus is mechanically set in accordance with the mode switching. Also,
For example, the dial is provided with a rotary switch to send information regarding the selected mode to a control section of the copying device, and the control section controls the copying device based on this information.

However, in the conventional device, the mechanical settings and the electrical settings for the selected mode were made separately, so there was a problem that there was a risk that the setting conditions for each would be different. For example, if a mechanical magnification setting error occurs, such as when a lens is set at an incorrect magnification position, an abnormal copying operation may occur, which may cause a failure of the copying apparatus.

[Objective] The object of the present invention is to eliminate such conventional problems, detect mode information from a mechanically set lens position, and send the detected mode information to a control section. That is, the object of the present invention is to provide a highly safe image forming device in which electrical mode setting is performed in conjunction with mechanical mode setting.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are a perspective view and a sectional view, respectively, showing an example of the configuration of a copying apparatus as an embodiment of the image forming apparatus jξ of the present invention. In the figure, reference numeral 1 denotes a document placing table made of a transparent member, and a pressing plate 1-1 for fixing the original on the placing table 1 is provided on top of the pressing plate 1-1. move back in the direction.

Reference numeral 2 is an imaging lens, and if the halogen lamp LAI is applied to the original placed on the original platen 1, 04
The original image is slit-exposed onto the photosensitive drum 3 by this lens 2. Further, the focal length of the lens 2 is changed by moving the lens 2 according to a magnification that is preset by the author using a variable power setting dial 2a.

A charger 4 charges the photosensitive drum 3 uniformly. An imaging lens 2 is used for a uniformly charged drum 3.
Image exposure is performed by , and an electrostatic image corresponding to the original image is formed.

Here, it is assumed that the copying apparatus in this embodiment can be set to each of the following modes.

(1) True magnification mode This is a mode for copying at a second equal magnification.
You can copy up to A4 modified (letter) size originals.

(2) Enlargement mode: A mode in which the original image is enlarged and copied.

(3) Reduction 1 mode: The ratio of the original image to the recorded image is set to 1.
: Q, 786 is a mode that reduces the original image, and can copy up to 84 size originals onto A4 size recording paper.

(4) Reduction 2 mode: The ratio of the original image to the recorded image is set to 1.
: A mode in which the original image is reduced as 0.687.

Therefore, if the magnification change mode is set to a reduction mode in which the width of the image area in the advancing direction is smaller than that of A4 size (or letter size), during electrostatic image formation, while the original platen l is moving forward, Black out lamp A
3 and LA4 are turned on to prevent excess toner from adhering to non-image areas.

FIG. 3 shows the relationship between the blackout lamps LA3 and LA4 and the image area on the photosensitive drum 3. Table 1 also shows the relationship between the magnification mode and the blackout lamps LA3 and LA4 that are turned on in accordance with the selected mode. When copying on the same A4 or letter size recording paper, the black eraser lamp 1. A3 or LA4
The lighting status of will be different.

First, the developing device 5 converts the electrostatic image into a W4 image. - is a paper feed sensor Q2 that detects that the transfer material P is manually fed.
When the solenoid SL4 is turned on, the solenoid SL4 is energized and descends toward the constantly rotating paper feed roller 6a or fixed roller 6b to nip the paper and convey it. Note that this paper feed sensor Q2 is connected to a detection arm 8- extending in front and behind the paper feed roller 6a.
1 and 6-2, and is turned on when either arm 8-1 or arm 8-2 is lifted by the paper.

The registration shutter 7 is always positioned so as to block the conveyance path 14h when the solenoid SL3 is not energized, and therefore, the leading edge of the transfer material P hits the shutter 7 and stops. When the leading edge of the transfer material P is locked in this way, the transfer material P slips between the rollers 6a and 6b and is not conveyed any further, but after that, the solenoid SL
4 disappears.

Then, by driving the solenoid SL4 again and supplying a registration signal to the solenoid SL3, the shutter 7 is lifted upward and the transfer material P is conveyed again, and the photosensitive drum is moved by the constantly rotating rollers 6c and θd. 3. Then, the toner image formed on the photosensitive drum 3 is transferred onto the transfer material P by the transfer charger 8.

Thereafter, the transfer material P separated from the drum 3 by the one-separation belt 8a is guided to a fixing device 10 by a guide 9, and the toner image on the transfer material P-1 is fixed by a fixing roller 10a containing a built-in halogen heater. Afterwards, the paper is discharged onto a tray 12 by a paper discharge roller 11.

Note that 03 is an optical or mechanical paper ejection sensor,
A detection signal is output by optically or mechanically detecting paper. T) II is a thermistor, which is a device for detecting the temperature of the fixing roller in the fixing device 10.

The remaining toner after transfer on the drum 3 is cleaned by the cleaner 98b, and the drum 3 is prepared for reuse.

8C is a cooling fan, which discharges heated air inside the copying apparatus housing to the outside.

A rack (not shown) is provided at the bottom of the mounting table l.

By rotating the pinion meshed with this rack, the mounting table 1 is moved in the F or R direction.

SLI is the document platen stop solenoid that controls the reverse clutch, and SL2 is the document platen stop solenoid that controls the forward clutch.
It is a quasi-solenoid, and controls the movement of the document table l by transmitting the rotation of the motor to the pinion via the forward clutch and reverse clutch.

Further, the lens 2 is mechanically moved by the rotation of the driving main motor according to the magnification mode set by the variable power setting dial 2a. Further, the document table l is moved at a speed corresponding to the selected magnification mode by changing a speed change gear (not shown).

FIG. 4 shows the position setting part of the lens 2, where 2b is a lens base, 48 is a lever for determining the lens position 11η, 2c is a positioning pier, and MS5. MS6 and MS? is a microswitch, and C7 and C8 are cams.

The lens 2 is mounted in the directions U and D indicated by the arrows in the figure (mount 2
The lever 48 and the bottle 2 moved together with the lever 48 and the bottle 2 provided on the base 2b
The position is set by fitting with c. That is, lever 4
9 is a portion 49a corresponding to lil i 2nd upper 2nd mode d 1st elementary school mode, normal size mode and enlarged mode, respectively;
49b, 48c, and 49d, and by positioning the pin 2C at any of these parts, the lens 2 is positioned in accordance with the selected magnification.

The positioning of the lens 2 and the speed setting of the document table l can be changed to each magnification mode by driving a motor and a cam (not shown) connected to the variable magnification setting dial 2a, respectively. Here, it is necessary to change the timing (registration timing) of feeding the recording paper P to the photosensitive drum 3 and the scanning area of the original, that is, the reversal position of the original platen, depending on each magnification mode, so these will be described later with reference to FIG. 12. There must be a means for setting the magnification mode selected in CPt1 Q203. Therefore, in this embodiment, the 41st A
cams C7 and C8 attached to the lens base 2b,
The microswitches MS5 and MS6 connected to the CPU Q203 play their roles to perform the settings, and the CPt1 Q203 executes the control vU control 11p of each magnification mode shown in FIG. 18 accordingly.

S5 is the reduction 2 to the microswitch associated with cam C7.
It turns off at position MS5a on cam C7 corresponding to the mode, turns on at position MS5b corresponding to the reduction mode, turns on at position 11M55c corresponding to the same magnification mode, and turns off at the position MS5d corresponding to the enlargement mode. to be placed.

In addition, the microswitch MSI associated with cam C8 (position H36a of cam C81 corresponding to the reduction 2 mode)
It turns on and corresponds to the reduced emode.
It is turned on at MS6b, and it is turned off at position MS13c, which corresponds to +4 for the same magnification mode, and 4 and 7 corresponding to the enlarged mode.
, lmet MS8d is arranged so that it is turned off. The relationship between these modes and the state of the microswitch is expressed as pBZ.
On the table]\su.

In addition, the black lamp turns off and A3 and LA4 turn on ('5'
(See Table 1) may also be controlled by the CPU Q203 based on the information of the selected I&R mode, but as shown in the fourth figure, the lens Lighting control can be performed by directly reading from position 2. In other words, Cam C? Microswitch M related to
S7 is the position MS on the cam C7 corresponding to the reduction 2 mode
? It turns on at a, lights up lamps L and A3, and positions MS? corresponding to the reduction 1 mode. Turns off with b and lamp LA3
is turned off at a position M2MS7c corresponding to the same magnification mode, turning off the lamp LA3, and turned off at a position MS7d corresponding to the enlargement mode, turning off the lamp LA3. On the other hand, the microswitch MS6 is turned on at position MSf (a, on at position iif, MS
8b tet, position MS6c thio7, and position N5
bd is turned off, and the lamp LA4 is turned on, turned on, turned off, and turned off, respectively.

\, Table 2 The copying apparatus in this embodiment has a manual feeding device δ that can feed only one sheet of transfer material P, but due to an increase in the amount of copies used, it is necessary to If you want to make a copy, place an ac- tion mark 1 at the bottom of the old copying machine main body C.
3 is connected to enable continuous feeding of F7,1 by the cassette 14.

This attachment 13 is provided with a paper feed roller 14a controlled by a solenoid 5L301 and conveyance rollers 14b and 14c that are constantly rotating.
A conveyance path is formed by d and 14e.

It is connected to the conveyance path 14f provided in the main body C.

Note that the conveyance path 14f and the conveyance path 14g for manual paper feeding are guided to a conveyance path 14h following both conveyance paths 14f and 14g, and the leading edge of the transfer material P is stopped by a registration shutter 7 provided on this conveyance path 14h. .

Further, 46 is an operation section provided on the attachment 13, and has a copy key and an operation/display section.

47 and 4 are the operation parts provided on the copying machine main body C,
These are the density adjustment lever and the power/jam display section, respectively.

FIG. 5 shows the operating section on the 4th day. Here, 48a is a segment display that can display the number of copies up to 18;
b and 4Frc are a plus key and a minus key, respectively, for setting the number of copies, and when pressed, the number of copies is counted up and down one by one at predetermined time intervals.

46d is a clear/stop key, which has the function of clearing the set number of copies and the function of stopping copying during a copying operation. 48e is a copy key for causing the copying apparatus to start a copying operation. Note that the segment display 48a indicates the cassette] If the paper feed sensor Q2 does not turn on even after a predetermined period of time has elapsed since the paper feed solenoid was driven, that is, if there is a paper feed error or there is no paper. “P” will be displayed blinking.

FIG. 6 shows a jam display section, where 48a is a power lamp that lights up when the copying machine is powered on, and 48b is a jam indicator that indicates when a transfer material has jammed.

Two microswitches MS3 and MS4 are provided on a part of the main body corresponding to the mounting table l, and a cam C is provided on the mounting table l in correspondence with the microswitches MS3 and MS4.

FIGS. 7(A), 8(A), and 91Δ(A) show the arrangement of the cam and the operation of the micro switch according to the selected magnification. As shown in these figures, reversing cams 04, 05 and start position cam C6 are provided corresponding to the microswitch MS3, and the microswitch MS4
Corresponding to the display position cam C1 and registration cam C
2. Provide a start position cam C3. These microswitches are turned on by being pressed by corresponding cams. Regarding the relationship between the cam and the switch, see Figure 7 (A), vJ811 (A).
The copying sequence in each magnification mode will be explained based on (a) to (h).

First, FIG. 7(A) shows the operating states of the cam and the microswitch in the enlargement mode, and FIG. 7(B) shows a timing chart in the enlargement mode.

As shown in (a) in FIG. 7(A), the mounting table l starts moving backward in the direction of arrow R, the cam C1 and the microswitch MS4 are separated, and the microswitch MS4 changes from on to off. Then, every time copying for one sheet of recording paper is completed, an output delay jam check is performed to detect whether a delay jam has occurred in the output, and an output stagnation check is performed to detect whether a jam has occurred in the output. A jam check is started, and when copying is completed, the solenoid SLI is turned on to stop the original table 1.

As shown in (b), the micro switch MS3
When the halogen lamp is turned on, Al is turned on, and when the micro switch MS4 is also turned on,
When the solenoid SLI is turned on and the cassette 14 is used to feed paper, the paper feed mischeck is turned on.

Next, as shown in (C), when the mounting table 1 moves forward in the direction of arrow F and the micro switch MS3 turns from on to off, the manual paper feed solenoid SL3 is turned on.

Next, as shown in (d), when the microswitch MS4 is turned on from off, the resistor solenoid SL
3 is turned on, a timer that determines the on-time of the resistor solenoid SL3 is activated, and the developing bias is switched within a certain period of time so that an image corresponding to the value of -47 is obtained. Then, the registration shutter solenoid SL3 is turned off and the manual paper feed solenoid SL4 is turned off in accordance with the time up of the timer.

Next, as shown in (e), no operation is performed when the microswitch MS4 is switched from on to off.

Next, as shown in (f), when the microswitch MS3 is turned on from off, the document platen advance solenoid milk 2 is turned off to control the reversal of the movement direction, and the halogen lamp LA
When copying a plurality of documents (continuous copying) with I turned off, the cassette paper feed solenoid 5L301 is turned on in order to copy the second and subsequent sheets.

Further, a developing bias switching timer is activated, and the developing bias is switched to a non-image type in accordance with the time-up of the timer.

Note that (g) and (h) show a state in which no operation is performed in the enlargement mode. For continuous copying, repeat (
Repeat steps from a).

A timing chart showing the operation timing of each of the above-mentioned parts in such an enlargement mode is as shown in FIG. 7(B).

Next, FIG. 8(A) shows the operating state of the cam and micro switch in the same magnification mode, and FIG. 8(A) shows the timing chart in the same magnification mode. As shown in a), when the mounting table l starts moving backward in the direction of the arrow R, the cam CI and the microswitch MS4 are separated, and the microswitch MS4 is turned from on to off, the copying process for one sheet of recording paper is completed. Every time copying is completed, an output delay jam check is performed, and an output retention jam check is also started, and at the end of copying, solenoid S is activated.
Turn on the LI and stop the original table l.

Next, as shown in (b), when the micro switch MS3 is turned on, the halogen lamp LAI is turned on,
Furthermore, microswitch MS4 was also turned on.

Sometimes, when the solenoid SLI is turned on and the cassette 14 is used to feed paper, a paper feeding error check is performed.

Next, as shown in (C), place I on the mounting table 1 in the direction of arrow F.
i; Ir1h, and when the microswitch MS3 turns from on to off, the single manual paper feed solenoid SL4 is turned on.

Next, attach a micro switch 1ls to Cd) with a dimension of 71j.
4, when it turns on from off, the registration shutter solenoid SL3 is turned on at that predetermined time, the type that determines the on time of the registration shutter solenoid SL3 is activated, and an image is obtained in which the developing bias is set according to the value of the copy density lever 47. Switch within a certain period of time so that Then, when the timer times up, the registration shutter solenoid SL3 is turned off, and the manual paper feed solenoid SL4 is turned off.
is off.

Next, as shown in (e), no operation is performed when the microswitch MS4 is switched from on to off.

Next, as shown in (f), when the microswitch MS3 is turned on from off, the document platen advance solenoid SL2 is turned off to control the reversal of the movement direction, and the halogen lamp L
When continuous copying is to be performed with the AI turned off and the same document is used, the cassette five-sheet solenoid 5L301 is turned on in order to copy the second and subsequent sheets. Further, a development bias switching timer is activated, and development/heyas is switched to non-image use in accordance with the time amplifier of the timer. Note that (g) and (h) show a state in which no operation is performed in the same-size mode. For continuous copying, again (a
) Repeat the steps from ).

In such a =9× mode, each of the two series t“iR
The timing chart showing the operation timing of is shown in Figure 8 (
B).

Next, FIG. 9(A) shows the operating states of the cam and microswitch in the small mode.

As shown in FIG. 9(a), the mounting table 1 starts moving backward in the direction of arrow R, and the cam C1 and microswitch MS
When the microswitch MS4 is separated from the microswitch MS4 and turns from on to off, an output delay jam check is performed every time the compound 'j, ': for one sheet of recording paper is completed, and an output retention jam check is also started. , When copying is finished, the solenoid SLI is turned on to stop the original table 1.

7 momme, micro switch MS3 as shown in (b)
When turned on, the halogen lamp LAI is turned on, and when the micro switch MS4 is also turned on,
When the solenoid SLI is turned on and paper is fed using the cassette 14, a paper feeding error check is performed.

Next, as shown in (C), the 14 paper feeders move forward in the direction of arrow F, and when the microswitch MS3 turns from on to off, the single manual paper feed solenoid SL4 is turned on.

Next, as shown in (d), when the microswitch MS4 is turned on from off, the resist shutter solenoid is turned on after a predetermined period of time, and the resist shutter solenoid S is turned on.
Activate the timer that determines the ON time of L3, and change the developing bias twice within a certain period of time so that an image corresponding to rff of <-47 is obtained. Registration shutter solenoid S
Turn off L3 and turn off manual paper feed solenoid SL4.

Next, as shown in (e), no operation is performed when the microswitch MS4 is switched from on to off.

Next, as shown in (f), when the microswitch MS3 is turned on from off, the document table advance solenoid SL2 is turned off and the movement direction is reversed, and when continuous copying is performed, the second and subsequent copies are ', ji, and so on, the cassette paper feed solenoid 5L301 is turned on. Further, a developing bias switching timer is operated, and the developing bias is switched to a non-III image in accordance with the timer time-up.

Next, as shown in (8), when the microswitch MS3 changes from on to off, the halogen lamp LAI is turned off. No operation is performed in (h). For continuous copying, the procedure from (a) is repeated again.・
- The timing charts of each part in the reduction 1 mode and reduction 2 mode are shown in FIGS. 9(B) and 9(C), respectively.
Shown below.

The copying apparatus in this embodiment has a reduction 1 mode and a reduction 2 mode, both of which perform the copying sequence shown in FIG. 9(A). The time (registration timing) from when the switch MS4 is turned on from off to when the registration shack solenoid SL3 is turned on changes depending on the forward speed of the document table l. Furthermore, as shown in Table 1, the lighting states of the blackout lamps are different between the two motes.

In the copying sequence of this embodiment, the halogen lamp LAI repeats blinking each time one copy is made, but there is a risk that the lamp will be lit continuously if an abnormality occurs in the lighting No. E or the lighting control element.

When the halogen lamp LAI is lit continuously, the temperature of the original table l rises abnormally due to the heat generated. The halogen lamp LAI has a temperature switch that turns off the lamp when the ambient temperature exceeds a certain temperature - but even so, the temperature is expected to rise abnormally if it is turned on continuously, so the halogen lamp LAI is turned on for more than a certain period of time. A protection circuit is provided to turn off the light when the temperature rises, and the temperature rise y of the original table l is suppressed at an early stage.

FIG. 10 shows an example of such a protection circuit. here,
R901NR914 and RFIIOI are resistors, D!
901 to D803 are diodes, ZD! 301 and 2
0902 is a Zener diode, (AQI to CSO3 are capacitors, Q901 is a photo I coupler, Q802 is a switching transistor, Q903 is a comparator, and Q804 is an I transistor that controls relay KI301.

In other words, this circuit connects the photocoupler Q901 from the alternating current voltage AC applied to both ends of the halogen lamp LAI.
and transistor Q802 detects the lighting time,
The lighting time is converted into a voltage using a resistor R13088 and a capacitor C802, and the voltage is converted to a set voltage determined by resistors R807 and R908 by a comparator Q90.
Compare by 3. Therefore, if the halogen lamp LAI continues to be lit for more than the set time, the transistor Q! 30
4 drives the relay 901, and the halogen lamp L
Cut off the voltage supply to AI.

According to the circuit shown in Figure 1O, the photocoupler Q801 as a lighting detection section detects lighting from the applied voltage, so if the halogen lamp LAI is disconnected, it will not actually turn on. It may be detected that the light is on even if it is not. Also, time/'ton positive pressure conversion resistor R90
6 and the capacitor C902, the error may become large.

Seventh, in this embodiment, a protection circuit as shown in FIG. 11 is provided.

In Figure 11, 0 is a current transformer, R951 to R856
and RFe51 is a resistor, D851 and D852 are diodes, 20951 is a Zener diode, 09
51 is a transistor, Q852 is a transistor as a lighting detection section, Q953 is a frequency divider, and Qθ54 is a transistor that controls 951 as a relay.

That is, in this circuit, lighting of the halogen lamp LAI is detected by the current transformer CT from the current flowing through the halogen lamp LAI, and the commercial frequency of the current, that is, 50)
The lighting detection section generates a pulse corresponding to 1z or 60H2. Then, accurate time setting is performed by counting the pulses using the frequency divider Q953. N, Norogen Lamp L
If AI continues to be lit for a set time or longer, transistor Q854 causes relay 901 to be quickly turned off to turn off halogen lamp LAI. Frequency divider Q when turning off the light
The reset of θ53 is performed by preventing pulses from occurring during a roughly set time determined by capacitor 0951 and resistor R854.

The protection circuit shown in FIG. 11 does not require an accurate oscillator, has a simple structure, and has extremely high reliability.

FIG. 12 is a block diagram showing a control circuit of the copying apparatus shown in FIG. Here, Q203 is a CPU.

For example, a microcomputer with a built-in 8-bit A/D converter, such as Texas Instruments' 7
MS2800 can be used. In addition, 1; Put
An A/D converter may be provided outside the 9203.

As a power supply to the copying apparatus, household AC power is input to the power supply circuit 200 via a transformer T1, and voltages of 24V and 9V are generated as DC power. The main AC power source is the main motor Ml, /\logen lamp LA.
I, used for old halogen heaters, etc. DC 24V power supply is used for Bug77 etc., DC9V power supply is used for CPUQ203 etc.

When power is supplied to the CPU 1203 by closing the main switcher SWI in response to power-on, the CPU 1203 performs initial reset/reset via an INIT terminal (not shown).
will be played. That is, the control program is activated.

In addition, as shown in Figure i13 (A), the signal S1, which has been full-wave rectified by the diodes D3 and D4, is sent to the waveform shaping circuit Q.
215 into the signal shown in FIG. 13(B), and IN
A zero cross pulse S2 is input to the T terminal and the Jl terminal as a high level signal near the zero cross point of the AC waveform from the AC power source.

If CPU Q203 is enabled for interrupts, C
The PU Q203 programs an interrupt at the rising edge of the zero-cross pulse S21 input to the INT terminal. Furthermore, CPU Q203 uses an internal program to
The number of zero-cross pulses input from the l terminal within a predetermined time is counted to distinguish between 50 and 80 Hz.

The start of the copy sequence by the CPU Q203 can be confirmed by the operator by the lighting of the power lamp 48a and the display "i" on the segment display 48a.

Also, when the initial reset is performed, the CPU Q
203 activates the built-in first timer and detects the high level of the signal input to the Jl terminal. If a high level is not detected, the process does not proceed to the next step, and if a high level is not detected even after the first timer finishes counting, it is determined that there is an abnormality.

When the high level of the signal input to the Jl terminal is detected, the timer for 50/60H2 detection is activated.

This timer is 100 milliseconds (ms) in this embodiment.
As shown in Figures 14 (A) and (B), when the timer is activated when a high level is detected, the timer converts the zero-cross pulse obtained from the AC power source into either (a) or (b). Count in range. 5 shown in Article 111(A)
In the case of 0 Hz, unless the high level at the beginning of counting is counted, only up to 10 pieces can be counted within 100 m5. In addition, in the case of 60Hz shown in FIG. 14(B), 5
As in the case of 0 Hz, if the first high level is not counted, there will be a minimum of 11 in 100 m5. So, total!
(If 1 is less than or equal to 10, it is 50Hz, and if it is greater than 10, it is 80Hz, then the power frequency of 50/60Hz can be determined.

Referring again to FIG. 12, Kl, 2. 4 and 8 are input ports, which are connected to output ports R11 to R13 via sensors, input keys, and the like.

FIG. 15 shows how these boats are connected to sensors, input keys, and the like. That is, a minus key 46c, a clear/stop key 413b, and a microswitch MS5 are connected to the input port Kl, a copy key 47C, a plus key 4eb, and a microswitch MS6 are connected to the input port (R2), and the input port 4 is connected to the input port Kl. There is a paper ejection sensor Q
3 and home position/bank position (HP/
BP) Connect the sensor (micro switch) MS3,
Input port 8 has jam killer, paper feed sensor Q2 and registration position sensor (micro switch) MS4
iConnect.

FIG. 18 shows the pulse output timing of output ports R'11-R13. When the interrupt program is activated by detecting the rise and fall of the pulse wave input to the INT terminal, the output ports R11 and R are activated at the predetermined timing of the interrupt program.
The CPU Q203 outputs pulse signals from 12 and R13 without overlapping, and at that point the information supplied to the input ports 1-8 is stored in the built-in RAM of the CPU Q203, and the input state is read. The output port R11 generates a pulse of 100 to 200 microseconds (μS) as a matrix dynamic scan signal under normal conditions, but if an abnormal phenomenon, jam, or abnormal operation occurs, a static signal or 0.6 seconds on70.
Performs pulse oscillation operation with 6 seconds off. Normal 100-2
The normal pulse oscillation of 00g5 is absorbed by a capacitor (not shown) connected to the output port R11 to prevent the jam indicator 48b from lighting up.

FIG. 17 shows a state in which output ports RO to R11, R14, OO to 07 are connected in the control circuit shown in FIG. 12. As shown in this figure, the output ports of CPU Q203 are RO-R11, R14, 00-O? Wire so that each part can be controlled independently. That is, output port R
O is not normally used by Mi, and is the output port I? 1 has a cassette paper feed solenoid S'[, 301, output port R2 has a document table advance solenoid SL2, output port R3 has a document table stop solenoid 1, output port R4 has a registration shutter solenoid SL3, output port). R5 is a power lamp 48a, output port R6 is a bias reflex circuit that adjusts the density and enables image density adjustment by 8-47, output capo R7 is a high voltage circuit HV, and output port R8 is a photosensitive Old main motor that quickly cuts off drum 3, etc. and pre-exposure lamp LA2, output capo) J? A halogen lamp LAI is connected to 9, an old halogen heater is connected to output port RIO, a paper feed solenoid St, 4 is connected to output port RI4, and a jam indicator 48b is connected to output port R11. In addition, segment display 4 is provided at output ports 00-07.
Connect 8a.

Furthermore, Decapo-)R? + of the signal output by and R3;
The If filling signal is connected to a jack (not shown) so that it is turned on at the start of copying and turned off at the end of the final copying. When the paper runs out during continuous copying, the signal from the output port R3 is turned on. This signal is used for sorter.

FIG. 18 shows the processing procedure by the CPIJ Q203 related to the movement nJj control of the document table l and the registration timing setting in each of the modes described in FIGS. 71-9.

First, in step 5100, the operator uses the variable magnification setting dial 2a to set the ratio and copy key 46e.
When is pressed, the motor is rotated to move the document table l backward in step 5lot. Further, the moving speed of the document table 1 and the position of the lens 2 are mechanically locked according to the selected ζ"-rate, and the document table 1 is positioned at the start position.

In step Sl◇2, the magnification signals are read from the microswitches MS5 and H88 immediately before the document table l is advanced, and the magnification 'S4H is recognized as shown in Table 2. If the mode is enlarged, set the F'/E flag to 1'', and if the mode is the same size, set the F/D flag to 1''.
However, if the mode is "reduction mode", the FIRI flag indicating this is set to "1". In step 5103, the document table advancement solenoid SL2 is turned on and the document table advances solenoid SL2 is turned on.
start moving forward.

In step 5104, it is confirmed that the microswitch MS4 passes through the nutat position cam C3, and in step 5105, it is confirmed that the microswitch M, S4 or the register position cam C2 is detected.

In step 5108, the registration timing at each magnification is determined, for example, as shown in the figure, according to the flag set in step 5102, and the registration shutter solenoid SL3 is turned on. In step 5107, the document platen reversing cam C5 detects that the microswitch MS3 is turned on, and if it is determined in step 5108 that the enlargement is in the 7'-mode, the process proceeds to step 5112, and the 19f document platen advance solenoid SL2 is turned off, and the document table l starts moving backward.

If it is not the magnification mode, the process proceeds to step 5108 and waits for the microswitch MS3 to be turned off by the document platen reversing cam C5.Then, the microswitch MS3 passes the reversing cam C5, and in step 5110 it is determined that the magnification mode is the same. If so, proceed to step 5D112, and
Reverse and move backwards.

If it is determined in step 511O that the mode is not the same magnification mode, that is, if the mode is the reduction 1 mode or the reduction 2 mode, the process proceeds to step 5ill, waits for the microswitch MS3 to be turned on by the reversing cam-C4, and then turns it on. When this happens, the process advances to step 5112.

Next, in step 5113, the microswitch MS4 detects the stop position cam C1, and in step 5114, the microswitch MS4 waits until it passes the cam Ct, and when it passes the cam Ct, the process proceeds to step Sl15, and turns on the document platen advance solenoid SLI. Then, the document table l is stopped and the copying operation is completed.

[Effect] As explained above, according to the present invention, the electrical mode setting is performed in conjunction with the mechanical mode setting, so even if a mechanical setting error occurs, abnormal operation will not occur. Therefore, it is possible to realize a highly safe image forming apparatus that does not cause such occurrences.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the configuration of a copying mechanism as an embodiment of the image forming apparatus of the present invention, FIG. 2 is a sectional view thereof, and FIG. Fig. 412 is a front view showing an example of the configuration of the lens position setting section, Fig. 5 is a plan view showing an example of the configuration of the operation section, and Fig. 6 shows the jam display section. A plan view showing an example of the configuration, FIG. 7(A) is an explanatory diagram illustrating the sequential operating states of the cam and the microswitch in the enlargement mode, and FIG. 7(B) shows the operation timing of each ra+ in the enlargement mode. FIG. 8(A) is an explanatory diagram explaining the sequential operating states of the cam and microswitch in the same-magnification mode; FIG. 8(CB) is a timing chart showing the operation timing of each part in the same-magnification mode; 9(A) is an explanatory diagram explaining the sequential operating states of the cam and the microswitch in the reduction 1 mode and the reduction 2 mode, FIG. 9(B) is a timing chart showing the operation timing of each part in the reduction 1 mode, 9(C) is a timing chart showing the operation timing of each part in the reduction 2 mode, FIG. 10 is a circuit diagram showing an example of the configuration of the protection device d of the rt document exposure lamp, and FIG. 11 is the document exposure according to the present invention. A circuit diagram showing an example of the configuration of a lamp protection device; FIG. ^) and (B) are, respectively, a signal obtained by full-wave rectification of an AC waveform from an AC power supply and a signal that is made to be at a high level at the cello cross point of the double waveform in the control unit shown in Figure 12. 14(A) and 14(B) are explanatory diagrams explaining the manner of counting the number of pulse signals corresponding to 50 Hz and 60 Hz, respectively. FIG. 15 is a diagram of the CPU in FIG. 12. 1st JΔ
is a timing chart showing the pulse output timing of the output port of the CPU, Fig. 17 is an explanatory diagram showing the connection state between the output port of the CPU and each part solenoid, etc., Fig. 18 is a timing chart showing the connection state of the output port of the CPU and each part solenoid, etc., and Fig. 18 is a timing chart showing the pulse output timing of the output port of the CPU. Flownaya I showing an example of related processing steps
・It is. l...Original placement table, 2 river lens, 2a...variable magnification setting dial, 2b...length (table, 2C...lens positioning pin, 3...photosensitive drum, 6...manual feed stand) , 7... Registration shutter, 14... Cassette, 46-48... Operation unit, 49... Lens positioning lever. SL2-SL4, 5L301 ・71/ /id. QINQ3... Sensor, LAl・・・Halogen lamp, LA3, LA4・・Black out lamp, ClNC8・・
・Cam, MS3~MS? ...Micro switch, Q203・C
P[+. 4b (ct) Fig. 6 (8) <A) Fig. 13 Fig. 15 Fig. 16

Claims (1)

[Scope of Claims] A mode including an optical system for reproducing the original image, and reproducing the original image without changing the size of the original image;
a reproduction means that can be set to a mode for reproducing the original image by changing the magnification of the original image; a mode selection means for selecting the mode; and a position setting of the optical system corresponding to the selected mode. a mode information detection means for detecting information regarding the selected mode from the set position of the optical system; and a control means for controlling the reproduction means based on the detected mode information. An image forming apparatus comprising: