JPS60115952A - Recording device - Google Patents

Abstract

PURPOSE:To execute a stable resist operation by constituting a titled device so that the resist operation is always executed for a prescribed time irrespective of a variable power mode. CONSTITUTION:This device switches a resist timing in accordance with a variable power mode, and also a resist operation is always executed for a prescribed time irrespective of the variable power mode. Heater control is executed and 185 deg.C is detected, and control of one cycle on and one cycle off of a heater is executed. A check of a feed paper sensor Q2 and an operation of a manual feed paper solenoid SL4 are executed. That is to say, when the feed paper sensor becomes on, whether a manual feed paper plunger has been driven for a prescribed time or not is detected. If it has been driven for a prescribed time, the operation proceeds to the next step, and if not, the subtraction is executed, and thereafter, the manual feed paper solenoid SL4 is turned on, and transfer paper is carried continuously. In this way, a stable resist operation can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a recording device having a variable magnification function.

[Prior art]

Conventionally, in this type of device, the scanning speed of the scanner differs depending on the variable magnification mode, so the registration timing of the transfer paper fed from the paper feed cassette etc. is changed depending on the variable magnification mode, and the leading edge of the 1ili7 image is aligned. was being carried out. However, in such devices, the registration operation always ends at the same timing regardless of the variable magnification mode, so if the number of variable magnification modes increases significantly, there will be a large difference in the execution time of the registration operation depending on the variable magnification mode. I ended up
There was a risk that accurate registration operations would not be possible.

〔the purpose〕

The present invention has been made in view of the above points, and an object of the present invention is to provide a recording apparatus that can perform stable registration operations regardless of the variable magnification mode.

〔Example〕

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

FIG. 1 shows a perspective view of a copying machine having a variable magnification function to which the present invention can be applied. Further, FIG. 2 shows a sectional view thereof. In the figure, l denotes a document placing table made of a transparent member, and a suppressing plate 1-1 for fixing the original on the placing table 1 is provided on top of it.The document table consisting of both can move forward in the direction of arrow F or in the direction of arrow to return to Reference numeral 2 denotes an imaging lens), and the reflected original image of the original placed on the original placing table l by the halogen 2 amplifier LA1 is slit-exposed onto the seamless photosensitive drum 3 by this lens 2.

Further, after the copy button is pressed, the lens 2 moves according to the magnification preset by the variable magnification setting dial 2a. A charger 4 charges the photosensitive drum 3 in the same manner. The uniformly charged drum 3 is subjected to -C image exposure by the imaging lens 2, and a static '1tL image corresponding to the original image is formed. Next, this electrostatic image is visualized by the developing device 5. Incidentally, the seamless photosensitive drum developing device and the charger are integrally detachable from the main body of the device. - Transfer material P that is manually fed from the top of the male manual feed table 6
is a paper feed sensor Q2 (this sensor Q2 is a detection arm 6-1.6- extending in front and behind the paper feed roller 6a) that detects that the transfer material P (hereinafter simply referred to as paper) is manually fed.
2, arm 6-1 or 6
-2 is turned ON by being lifted by the paper. ) turns on, manual paper feed solenoid 8
The paper feeding roller 6a, which is constantly rotating with L4 energized, descends toward the fixed roller 26b, grips the paper, and conveys it. Since the registration shutter 7 is always positioned so as to block the conveyance path 14h, the leading edge of the paper hits this shutter 7 and is stopped. When the leading edge of the paper is stopped in this manner, the paper slips between the rollers 6a and 6b and is no longer conveyed, but after a while, the energization of the manual paper feed solenoid SL4 stops. After the manual paper feed solenoid SL4 is driven, a registration signal is applied to the registration shutter solenoid SL3, and the shutter shutter 7 is lifted upward, and the paper is conveyed again, and the constantly rotating roller 6 c.

The photosensitive drum 2 is sent toward the photosensitive drum 3 by the photosensitive drum 6d.

Then, the toner image 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 separation bell 8a is transferred to the fixing device 10 by the guide 9, and the toner image on the transfer material P is fixed by the fixing roller 10a which has a built-in halogen heater Fl1. 2, the paper is discharged onto a tray 12 by a paper discharge roller 11.

Note that NQ3 is an optical or mechanical paper ejection sensor,
By detecting paper, a detection signal is output. Further, THI is a thermistor, and is used to detect the temperature of the fixing row 2 in the fixing device 10.

The toner remaining after transfer on the lower ram 3 is cleaned by a cleaner 8b and is ready for reuse. 80
A cooling fan is used to exhaust the heated wall air inside the copying device housing to the outside.

A rack (not shown) is fixed to the lower part of the mounting table 1 according to the present embodiment, and the mounting table 1 is moved in the direction F or direction by rotating a pinion meshed with this rack. However, the solenoid SLI is the document platen stop solenoid that controls the reverse 2-way movement, the solenoid SL2 is the yj that controls the forward clutch, the polishing forward solenoid is output, and the motor M1 is
rotation? The movement of the document table is controlled by transmitting the signal to the binion via the forward clutch and reverse clutch.

Also, due to the rotation of the motor Δ11, the variable magnification setting dial 2a
According to the magnification set in , mechanical y (not shown),
Move the cylinder lens 2 by movement.

Two microswitches MS3. The MS4 is fixed, and a cam is fixed on the mounting table so as to correspond to this microswitch.

FIGS. 12A, B, and C are diagrams showing the arrangement of cams and the operation of microswitches according to each magnification. Reversing cams C4, C5 and start position cams C6 are provided corresponding to microswitch MS3. Additionally, a home position cam C1, a registration cam C2, and a start position cam C3 are provided corresponding to the microswitch M84. The relationship between the cam and the switch will be explained with reference to FIGS. 12A, B, and Ca-h. First, to explain the enlargement mode with reference to a to h in Fig. 12A, as shown in a, the mounting table starts to move backward (in the direction of the arrow), cam C1 and MS4 are separated, and MS4 changes from ON to OFF ( MS3.M
When S4 is turned ON (when pressed by the cam), the original platen stop solenoid SLI is turned ON (but only at the end of copying), and a jam check at the exit of the final copy is started.

Next, as shown in b (when MS3 is turned on, the halogen lamp LAI is turned on, and when both MS3 and M840 are turned on, the document platen stop solenoid SLl is turned on, and a paper feeding error check (cassette paper feeding only) is performed.

Next, as shown in C, the mounting table moves forward in the direction of arrow F, and the MS
3 goes from ON to OFF, manual paper feed solenoid SL
Turn on 4. Next, as shown in d (when MS4 goes from OFF to ON, resist shutter solenoid SL3 is turned ON).
, change the developing bias to image according to the value of the copy fJk degree lever, and press the registration shutter solenoid SL3.
Start a timer that determines the 08th hour. Then, when the timer expires, the registration shutter solenoid SL3 is turned OFF, the manual paper feed solenoid SL4 is turned OFF', and a temporary exit jam check is started for consecutive copies (excluding the last copy).

Next, as shown in elc, when MS4 changes from ON to OFF, no operation is performed.

Next, as shown in f (when MS3 is turned from OFF to ON by cam C5, the M gantry advance solenoid 8L2 is turned OFF.
The direction of movement is reversed as follows.

Next, as shown in g (when the MS3 changes from ON to OFF, the halogen lamp LAI is turned OFF, the cassette paper feed solenoid 8L301 for the second and subsequent sheets is turned ON (in the case of continuous copying), and the developing bias switching timer is turned on. When the timer times up, the developing bias is switched to non-image, and an exit delay jam check is performed.

Note that in h, no operation is performed in the enlargement mode, and in i, no operation is performed.

In the case of continuous copying, the control from a is repeated again.

Next, to explain the same magnification mode using a and h in FIG. 12B, as shown in a, the mounting table starts moving backward (in the direction of arrow R) and the cam CI and MS 4 #! away, MS4 turns from ON to OFF' (MS3.MS4 turns ON when pushed by the cam)
), turn on the document platen stop solenoid SLI.
(However, only at the end of copying), the exit jam check for the final copy starts.

Next, as shown in b, when 81S3 is turned on, the halogen lamp LAI is turned on, and then KMS3. Both MS4s are ON
When this happens, the document platen stop solenoid SLI is turned ON and a paper feeding error check (cassette paper feeding only) is performed.

Next, as shown in C, the @ placing stand moves forward in the direction of arrow F')j,
When MS3 changes from ON to OFF, manual paper feed solenoid 8L4 is turned ON. Next, as shown in d, <MS4 is OF
When it is turned on from F, the registration shutter solenoid 8L3 is turned on after a predetermined time, the developing bias is switched to that for images according to the value of the copy density lever, and a timer for determining 08 hours of the registration shutter solenoid SL3 is started. Then, when this timer times up, the registration shirt solenoid SL3 is turned OFF, the manual paper feed solenoid SL4 is turned OFF, and the continuous copying is started at one time. 7+? Starts jam check (excluding the final copy).

Next, as shown in e, MS, i starts from ON (J 1=”
When changing to F, no operation is performed.

Next, as shown in f (, MS3 turns cam C5 from ON to 0).
When it reaches 1i'F, turn off the document platen advance solenoid SL2.''
As F, the direction of movement is reversed.

Next, as shown in g, when MS3 changes from OFF to ON, the halogen lamp LAI is turned OFF, the cassette paper feed solenoid 5L301 for the second and subsequent sheets is turned ON (for continuous copying), and the development bias switching timer is turned on. When the timer times up, the developing bias is switched to non-image, and an exit delay jam check is performed.

Note that in h, no operation is performed in the same magnification mode.

In the case of continuous copying, the control from a is returned again.

Next, to explain the reduction mode with reference to a to h in Fig. 12C, as shown in a, the mounting table starts to move backward (in the direction of the arrow hole), the cam C1 and MS4 are separated, and the MS4 changes from ON to OFF.
F F (MS 3. MS 4 is O when pushed by the cam
(N), turn the document platen stop solenoid SLI to O.
NI (However, only at the end of copying) Starts the final copy exit jam check.

Next, as shown in b, when MS3 is turned on, the halogen lamp LAl is turned on, and then MS3 is turned on.

When both IVIS4 are turned on, the document platen stop solenoid SLI is turned on and a paper feeding error check (cassette paper feeding only) is performed.
3 goes from ON to OFF, manual paper feed solenoid SL
Turn on 4. Next, Yokun 184 shown in d is OFF'
When the register shutter solenoid SL3 is turned on after a predetermined time, the developing bias is switched to the one for image use according to the value of the copy density lever, and a timer is started to determine the ON time of the registration shutter solenoid SL3. Then, when this timer times up, the registration shirt solenoid SL3 is turned OFF, the manual paper feed solenoid SL4 is turned OFF, and a temporary jam check at the outlet during continuous copying is started (excluding the last copy).
.

Next, as shown in e (when MS4 changes from ON to OFF, no operation is performed).

Next, as shown in f, when the MS3 turns the cam C4 from OFF to ON, the document platen advance solenoid SLZ is turned OFF.
The direction of movement is reversed as follows.

Next, as shown in g, when the <M83 force changes from EON to OFF, the halogen lamp LAI is turned OFF', the cassette paper feed solenoid 5L301 for the second and subsequent sheets is turned ON (in the case of continuous copying), and the development bias switching timer is turned on. When the timer times up, the developing bias is switched to non-image, and an exit delay jam check is performed.

Note that no operation is performed at h.

In the case of continuous copying, the control from a is repeated again.

The copying apparatus according to this embodiment has a built-in manual feeding device that can feed only one sheet of transfer material P as described above, but due to an increase in the amount of copies used, a large number of sheets of transfer material can be continuously copied. In this case, attach the attachment 13 at the bottom of the copying machine main body C.
By connecting the cassette 14, continuous feeding is possible.

This attachment 13 has a cassette paper feed solenoid 5.
A paper feed row 214a controlled by L301 and conveyance rollers 14b+14c that constantly rotate are provided, and a conveyance path formed by conveyance guides 14d and 14e is connected to a conveyance path 14f provided in the main body. It shall be done as it is done.

Note that the conveyance path 14f and the aforementioned conveyance path 1 for manual paper feeding are
4g is a conveyance path 14h common to both conveyance paths 14f and 14g.
The leading edge of the transfer material P is stopped by a resist shutter 7 provided on the transport path 14h.

Note that 46 is an operation section provided on the attachment 13, and has a copy key and an operation/display section. Also 47.4
8 is the operation section provided with CVC on the main body of the copying machine, and 47 is d
The grass f adjustment lever 48 is a power supply/jam display section.

FIG. 3 shows the operating section 46 and the power supply/jam indicator section 48 in more detail. In figure a, 46a is a segment display that can display the number of copies up to 19 sheets, and if there is no paper or there is a paper feed error when feeding the cassette, it will blink 0 and notify the operator! Ru. Reference numerals 46b and 46c are copy number setting keys (plus key, minus key), and when pressed, the number of copies is counted up and down one by one at predetermined time intervals.

46d has a function to clear the number of copies set with the clear/stop key and a function to stop copying during copying operation. 47e is a copy key for starting a copy. 488 in FIG. b is a power lamp that lights up when power is input to the copying apparatus, and 48b is a jam indicator that displays when the transfer material is jammed. In addition, since this device uses the display path for setting the number of copies to be used for paperless display, etc., the configuration of the operating section is simple, making it easy to operate and reducing costs. be able to.

FIG. 4 is a control circuit block diagram of the copying apparatus of FIG. 1. Q203 is the control unit that controls the 8-bit A/D controller.
-1't, such as a Texas Instruments TMS2300. Note that an A/D converter may be provided outside the control unit Q203.

In addition, as a power supply, household AC power is connected to transformer T1.
By inputting the voltage from the power supply circuit 200 through the power supply circuit 200, 24V and 9V are generated as a DC power supply. The AC power supply is mainly used for the main motor M1, the four-gen lamp Lk 1, the four-gun heater H1, etc., the DC 24V power supply is used for the plunger solenoid, etc., and the DC9 power supply is used for the microcomputer Q203, etc. (c) Ru.

When a stain source is supplied by turning on the main switch MS, the microcomputer Q203 turns on iNi'l'.
(not shown) Initial reset is performed by a terminal. The Rima blog 2 system starts according to the 70-chart described below. Further, as shown in FIG. 5a, a diode D3. The full-wave rectified signal by D4 is inverted and amplified by the inverter Q215 to produce a signal as shown in Figure 5.The signal is then inverted and amplified by the inverter Q215, and an alternating current waveform (AC'\
H near the zero-crossing point of the waveform from the W source
It is input as a zero-cross pulse that reaches the level. In addition, Fig. 5a.

The signals b are the signals shown at sl and s2 in FIG. 4, respectively. If the microcomputer Q203 is enabled for interrupts, the microcomputer Q203
203 is the zero cross pulse S2 input to the iNT terminal
At start-up 9 (FIG. 5b), the interrupt program is entered. Further, at the J1 terminal, an internal microcomputer program counts the number of zero-crossing pulses input within a predetermined period of time to distinguish between 50 and 6012.

That is, after the power is turned on and the microcomputer Q203 is initial reset, control of the control section shown in FIG. 4 is started according to a flowchart described later.

The microcomputer Q203 starts the jitance by lighting the power supply 2 lamp 48a and segment display 46.
This can be confirmed by the display "1" in a. Also, when the initial reset is performed, the microcomputer Q20
3 starts the first timer. Then, the H level of the J1 terminal is detected. l (If the level is detected, it will not proceed to the next step.Also, if there is no detection even after the first timer ends, it will be considered abnormal.When the H level of the Jl terminal is detected, 50/60Hz is detected. Start a timer for 100 m in this embodiment.
5ec, and when the timer is started at H level as shown in FIGS. 6a and 6b, the timer counts zero-cross pulses obtained from the AC wire in the range (a) to (b). In the case of 50Uz (in the case of figure a), if the count does not exceed the initial H level, it will reach the maximum l during the 100m plexus.
It only counts up to Oke.

Also, in the case of 60flz (in the case of figure b) the count is 50
As with 11z, if you do not count the first H level, there will be at least 11 digits in 100m (8), so if the count is less than 10, it is 50&,, if it is greater than 10, it is 60 Hz, it is 50 , 601Tz can be determined. As a result, accurate control can be performed even if the frequency is switched. Further, if the count result is 6 or less, trouble such as at least one of the diodes D3 and D4 is damaged is expected, and an abnormal output may be output. FIG. 7a shows a signal (signal 512) when one of D3 or D4 is open, and FIG. 7b shows a signal (signal 522) when signal 812 is inverted and amplified by inverter Q215. Also, 812
, 822 are the signals indicated by Sl and 82 in FIG. 4, respectively. It is also possible to notify the user that an abnormality has been detected and to compensate for the inconvenient part in the sequence so that the copying operation can be performed.

In this case, it is necessary to correct the zero-cross pulse abnormality using a microcomputer to satisfy the function of the copying apparatus.

For example, the trouble that is expected to occur due to damage to one of the diodes D3 or D4 is the timing of turning on the halogen heater H1, which is cross-controlled, and this timing will be about 1/2 of the normal timing. Weight-up time becomes longer. Furthermore, the timer time counted up by the zero-cross pulse output from the inverter Q215 doubles.

Therefore, in order to correct this abnormality, it is necessary to keep the count number below 6 and set the timer for counting zero-cross pulses to half the value. In addition, the halogen heater H1 is 50/60 from the zero cross point.
The wait time can be shortened by starting a timer corresponding to Hz and turning on the halogen heater again when the timer is up (the next zero cross point). In addition, the fixing row 210a
When the temperature reaches a predetermined temperature and the heater is turned off, there is no problem, so the timer is not forced to start as described above. Also, instead of using the timer, you can turn on the halogen heater by watching the falling edge of the zero-cross pulse input to the Jl terminal.
0 However, if the above correction is made, the diode D
Even if one of the 3t D4 is damaged (an abnormality in the number of zero-crossing pulses), the copying operation is possible, so some users may not be able to discern the abnormality.

Further, if the abnormality of the diode as described above is left untreated, many unreasonable problems will occur, such as the guaranteed life of the copying device will be shortened. Therefore, the copying function can be stopped at the same time as an abnormality is detected. Incidentally, if the count number 0 or 1 occurs, it is impossible to drive due to the device configuration, so an abnormal output is generated.

If we return to the fourth control unit again, the input port is Kl, 2. 4. , and 8, and are connected to the output boats 11 to R13 via a sensor key, etc. (c). A diagram of these is shown in FIG. As shown in the figure, the input port 1 has the ina key 46c1, the clear/stop key 46d1, the variable power switch MS5, and the input port 2 has the copy key 47e1, plus key 46b1, the variable power switch MS6, and the input port has the copy key 47e1, plus key 46b1, the variable power switch MS6, and 4 has a paper ejection sensor (also referred to as ejection sensor) Q3, home position/back position (J4P-13P) sensor MS3, and an input port.
) K8 is input with the jam kill, paper feed top/su Q2, and registration position sensor M84, respectively. In addition, the magnification 1 switch MS5, the magnification 2 switch 1s6I'i,
It is turned on/off according to the variable magnification mode set by the variable magnification setting dial 2a. Further, the input method is performed at the timing shown in FIG. When the interrupt program starts due to the rise of the pulse wave manually input to the iNT terminal, the output port 11. 12. Let 几13 output the pulse signal without overlapping, R11゜R12,)t
When the output is output to 13, the contents of input ports 1 to 8 are stored in the RAM in the microcomputer Q203 and the input state is read. Output port R11 normally has a period of 100 to 120 as a dynamic scan signal.
Pulse oscillation is performed with an H level of 100μ to 200μ at Hz, but in the event of an abnormal phenomenon, jam, abnormal operation, etc., a static signal or a 0.6 second ON signal is generated.10.
Performs 6 seconds off oscillation operation. In the case of normal pulse oscillation of the 100μ to 200μ type, the oscillation output from the capacitor 11 is absorbed by the unillustrated co/capacitor connected to the capacitor 11, so the jam indicator lights up due to this oscillation output. 10. Not lit, static output of the latter or on for 0.6 seconds.
When the oscillation output is off for 6 seconds, the jam indicator lights up or blinks.

RO~R13, R14゜QO~Q7 of the control unit Q203 are wired so that they can be controlled independently at output ports,
Ru. A diagram of these is shown in FIG. As shown in the figure, the output port 0 is not normally used. Also, the output port R1 has a paper cassette feed solenoid 8L301, the output port R3 has a document platen advance solenoid 81, 2, the output port R3 has a document platen stop solenoid SLI, and the output port R4 has a registration shutter. SL3, a power lamp 48a at the output port R5, a bias switching circuit Bl that enables the density adjustment lever 47 to adjust the image density at the output port 6, and a high voltage circuit H at the output port R7.
V is the output port) R8 is the main motor M1 that drives the photosensitive drum 3, etc., the output port R9 is the halogen lamp LAI, the output port R10 is the halogen heater H1, and the output port R14 is the manual paper feeder. The solenoid SL4 and the jam indicator 548b are connected to the output boat R11, respectively. Also, a segment display 46a is connected to the output QO-Q7.

Next, temperature control in this embodiment will be explained. As mentioned above, the microcomputer Q203 has an A/D input function, so it inputs the analog input of the temperature control element (thermistor) THI to the input yj-'-tAl and converts it into a digital signal (hereinafter referred to as this digitally converted signal). A/D the value
It is called value. ), the temperature of the halogen heater H1 is controlled. This temperature control is done by the thermistor THI.
Additionally, in order to effectively control the fixing low >ioa from a low temperature (below 50° C.) to 200° C., a resistor R203 is connected in parallel with the thermistor THi.

As a result, the resistance value range of the thermistor THI is narrowed, and the resistance value is set to such a value that temperature control of the fixing row y 10a near 180° C. can be performed accurately and faithfully.

When a thermistor having an ohm in the range of OK ohms to 800 ohms is used as a temperature control element, there is a temperature difference of 10 degrees C or more when the control temperature changes by IK ohms at 90 degrees Celsius (depending on the characteristics of the thermistor).

Also, if you simply convert up to 800 Ω using an 8-bit A/D converter, you will get data with more than 2 Ω per 1 bit. Therefore, control of ±1°C near 180°C cannot be achieved. However, by inserting a resistor R2O3 in parallel with the thermistor THI as in this embodiment, the control point (near 180°C) can be accurately controlled. Since a certain degree of detection can be performed at low temperatures, optimal temperature control can be performed.

As described above, in this embodiment, the temperature can be controlled over a wide range with a simple circuit configuration using an 8-bit A/D converter, and moreover, temperature control can be performed with high precision. In addition, resistor 1 mo 206, R207, 几208 are A/D
The key points for setting values are terminals vREF and ■A8.
8 voltage values are set. The A/D value at x(V) input to AI is calculated as follows.

(VASS Vazy) / 255 = a(X
VREF ) / a = b When b is converted to a hex code, it becomes a digital (A/D) value at x (V).

Therefore, in this circuit configuration, the thermistor TH1 terminal is open (
The A/D value is set to be FF in a state of disconnection, and 00 in a state of short circuit. Also, depending on the usage condition, the combination of the resistance value of the thermistor THI and the A/D value can be changed to resistor 1 or 206.几207. R2O3, 几201.几203. Various combinations of the values of 几202 can be considered, but in this embodiment, we have adopted a configuration that makes it possible to read the required temperature level with even greater accuracy under conditions where temperature control can be ensured. ing.

Next, the temperature control of the fixing row 210a will be explained in more detail. As mentioned above, in this example, the thermistor T
H1 reads the surface temperature of the fixing roller 10a, and converts this into an A/D value to determine the current temperature.

Additionally, the Harokun heater H1 is zero-cross controlled by the aforementioned zero-cross pulse.

As shown in No. 110, in this example, To (145° C.).

T, (155°C), T2 (165°C), Ta (18
The following temperature control is performed using 8 different temperatures at 4 points (5°C).

In Fig. 15, the dashed-dotted line indicates the fixing row 2 with full-wave energization.
The solid line shows the surface temperature change of the fixing roller 10a due to 1 cycle on/1 cycle off.

(1) When the power is turned on, the surface temperature of the fixing roller 10a is detected by the thermistor TH1, and this reaches a predetermined temperature T as shown in Figures A and B in @15. If it is lower than that, the first timer is started and the halogen heater H1 is supplied with full-wave current during that time.

T when the first timer exceeds 7 I:I- (end). It is judged whether it is above or below, and if the temperature is below To as shown in FIG. 11A, then T. Full-wave current is applied until it is detected. When To is detected, the wait is canceled, that is, the copy is enabled. After detecting the trench To, the halogen heater Hl is energized for one cycle on/one cycle off. As shown in FIG. 11B, when the first timer detects a value equal to or higher than To at the point R where it overflows, the wait is canceled and energization is performed for one cycle on/one cycle off. Incidentally, during the wait, the power switch 48a is flickered. Furthermore, the frequency! In order to make the flickering time the same even when A is reached, 50/60 Hz is determined by the zero-crossing pulse and the set value of the zero-crossing pulse to be counted is changed.

When the wait is released, the power source 2 lamp 48a is turned on continuously.

(11) When the power is turned on, the temperature detected by the thermistor TH1 is as shown in FIG. 11C.

(155°C), the weight is released after full-wave energization for 2 seconds. After the wait is released, energization is performed for one cycle on/one cycle off.

(Tsukuda) When the power is turned on, the temperature detected by the thermistor TH1 is as shown in Figure 11 (T, (155℃) to T2 (165℃).
), the wait is released after full-wave energization for 1 second. After the wait is released, energization is performed for one cycle on/l cycle off.

(IV) The temperature when the power is turned on is as shown in Fig. 11E <Tt(
If the temperature is between 165°C) and T3 (185°C), the weight is released and the halogen heater H1 is controlled using a 1-cycle-on/1-cycle-off energization method.Then, the final point is T, (185°C). After the temperature is stabilized and the surface temperature of the fixing roller 10a reaches T, the surface temperature of the fixing roller 10a is adjusted by repeating halogen heater H1 off → 1 cycle on/1 cycle off. It is stabilized near T.

When controlling the temperature of the fixing roller 10a as described above,
By using a timer as in this embodiment, the need for complicated temperature control program software can be reduced. Furthermore, by combining the method of supplying electricity to the halogen heater 141 with a timer, it is possible not only to prevent overshoot, but also to perform temperature control with higher accuracy.

Further, in this embodiment, as a safety mechanism, in the following cases, it is assumed that there is an abnormality in the drive circuit including the halogen heater H1 or thermistor THI, and the halogen heater H1 is energized.

b) When the temperature of the fixing row 210H does not reach the first predetermined temperature even after 11 seconds have passed since the power was turned on. Mouth) Fixing row 2
When the temperature of 10a does not reach the second predetermined temperature (for example, 145° C.) even after 30 seconds have passed after reaching the first predetermined temperature (for example, 70′ C) after the power is turned on. c) When the copy is enabled, use the halogen router H1 for 20 consecutive seconds.
When the power is not applied.

Finally, here, the temperature of the fixing row 210a is detected by a thermistor, and a timer until the detected predetermined temperature i becomes an abnormal state is varied according to a specific timing. Note that it is possible to change the timer not only in accordance with the detected predetermined temperature but also in accordance with the operating state of the copying machine.

In this way, according to this embodiment, it is possible to detect abnormalities in the drive circuit including the thermistor, halogen heater, etc., which was previously impossible, thereby further increasing safety.

The temperature control has been described above, but with the configuration of this embodiment, a high-power halogen heater can be used, so the wait time is shortened and the system is very easy to use for the user.

Furthermore, the safety mechanism of this embodiment is particularly effective when using a high-power log heater.

Next, the program executed by the microcomputer Q203 will be explained using the flowchart shown in FIG. 13a-h.

The copying machine to which the present invention is applied has a main switch MS=iO.
When N, a reset signal (pulse of about 10msz) is sent to the reset terminal of the microcomputer that makes up the control section.
is applied, and the control flow as described below starts.

Note that the flags used in the flowchart and their functions have been explained with reference to Tables 1 to 3. or,
Table 4 shows the relationship between each mode set by the variable magnification setting dial 2a and the variable magnification 1 switch M8B and the variable magnification 2 switch MS6. Note that the reduction ratios are different between the reduction 1 mode and the reduction 2 mode. Also, please refer to FIGS. 14a to 14b, which show operation timing charts of each component of the copying apparatus. However, in this Figure 14, Δ
indicates a paper feed misjam check, △ indicates an exit delayed jam check, ←-→ indicates an exit accumulated jam check, A is required in the case of continuous copying, and if there is no paper out state during this period, a jam occurs. This is a jam that cannot be cleared within 5.0 seconds. Also, in FIG. 14, the part indicated by a black △ indicates the timing of application of the drive current or the timing of detection by the sensor. This is an area where image density adjustment is not possible.

In addition, in FIG. 14, "waiting" indicates the state until the fixing loan temperature reaches the specified value, and "standby"
indicates a copy-enabled state.

Table 1 Table 2 Table 3 Table 4 After the initial reset of the microcontroller used in the control unit, the internal memory contains random values, so first clear the memory (RAM). Furthermore, the number of copies of the apparatus is automatically initialized to 1, and 1 is displayed on the display accordingly. (Step 100) Next, in order to determine 50/60 Hz from the power frequency monitor signal (zero cross signal + j) input to the Jl terminal, an internal timer is set (step E 01), and the timer When the process ends, interrupts are enabled (step 102) to allow internal interrupts, and the process waits for the start. The timer starts when the input to the J1 terminal becomes H level (assuming there is a zero-crossing H input) (step 103).If it does not become H level, it is stuck in the loop of step 103. Put it away. Although not specified in this flow, it is also possible to detect an abnormality by detecting that this loop has been broken by 1 for a predetermined period of time or more. Step 1 when there is a high level input (H input) of the zero cross signal
On 04, the internal timer set above (100m
=w) starts and sets the internal memory flag (F/zero detection). This is set when the iNT terminal (or J1 terminal) is at H. The flag F/frequency indicated in step 105 is 100m after the above timer ends.
This flag is set when 5ec has elapsed (when an internal interrupt occurs), but it is not set at this point because no interrupt has occurred. From then on, steps 106 to 110 i
Step 109,1 every time the NT terminal changes to H level.
The memory is counted up at 10.

Normally, 9 zero-crossing signals at 50Hz and 11 zero-crossing signals at 60fJz are counted during 100m5x. Therefore, when the internal timer finishes counting and the first zero cross signal rises (9), the interrupt program shown in FIG. After F/frequency is set in step 402, internal interrupts are disabled in step 403, and in steps 404 and 405, 50/
A determination of 60 Ez is made.

In other words, if memory ≧ 10 and there is no data, it is determined that it is 5011z, and in step 406, the 50Hz 7 lag F150h is set to return to the original 70-, and if it is not available, the original flow is returned as it is. be.

In the subsequent step 70-, the process moves to step 113.

In steps 113 and 114, the power lamp is turned on.

The initial state of the device, such as bias switching, is set. In step 115, the thermistor T input to the A 1 terminal
A timer is provided to read the stable value of the detected value of H1.

Since this device controls the halogen heater H1 by A/D converting the signal of the thermistor T H1, step 116
The signal of the thermistor THI is read at step 12o according to this signal value.

Step 121. Step 122. Perform any of the settings in step 123. First, in step 117, 145
If it is detected that the temperature is below 0.degree. C., the process moves to step 120 and a 2 second timer is set. Here, the minimum full-wave energization time of the halogen heater H1 is set. If YES in step 118, that is, if the detected temperature is 145°C (/T (155°C), step 12
1 and the flag F/14 indicates that the temperature is 145°C or higher.
Set the flag F/disconnection indicating that there is no disconnection and a 2 second timer (minimum full-wave energization time). Also step 11
If YES in step 9, that is, 155℃<T<165℃, in step 123, set the 7-ring F/145, 7-lag F/W+ line, and a 1 second timer (minimum total liquid flow '4 hours). do. If the temperature is 165°C or higher, proceed from step 119 to step 122 and set the flag F/145.7 lag F/
7 lag F/, 15, which means wire breakage and weight release.
5 and then turn on/off for 1 cycle with a 20 second timer.
Set the maximum continuous energization time for one cycle off. After this time, if the halogen heater H1 is continuously energized for 20 seconds or more, the 20 second timer counts and amps in the interrupt program, and 72g F/AUTO is set.
Step 31υ dog and step 7'315. Step 31
6, the temperature is considered abnormal, and in this case, the display 46a indicates E.
and 0 are displayed alternately, and the JAM9 amplifier 48b is lit to notify that the drive circuit including the thermistor is abnormal.

Next, check the paper output sensor Q3 as an initial input check, and if it is in the UN state (paper shortage detected), step 12
4 to flowchart 7-H in Figure 13e 5JAM
Outputs the lighting of the lamp. In other words, the main motor is turned off.
:l” (step 240) Jam 72 Tsug F/J
Set AM, (snap 240-1) high voltage circuit HV
is U i' F (step 240-2), and after 0.6 expressions (step 240-3), jamsimp 48b4O
N (step 240-4). This Ja.

The lamp flickers at intervals of 0.6 and 0.6 ai, and when it detects the 0.6 ai error (step 240-5), the lamp is turned off (step 240-6), and this state is reduced to 0.
6 If the east continues, turn on the lamp again (step 240)
-4) It repeats a loop. In this way, in this example, the timer used for blinking the display is used in combination with the timer for delaying abnormal display, so that memory can be saved. Therefore, it is particularly effective when the device uses a one-chip microcomputer.

After completing the above checks, in step 125 control of the two devices is started for each zero-cross pulse input to the iNT terminal. If the device is equipped with a drum or the like, and the drum has finished copying a predetermined number of sheets, step 126 is performed.
Detection is activated and the process enters step 129, where the abnormality in the lifespan is outputted by flashing the segment display 46aK numerical value 1 at 0.6 second intervals to notify the user. That is, a 0.6 second timer is started (step 129-1), and after 0.6 seconds have elapsed, RAM VC data 1 for storing display data is stored (step 129-2), and this is displayed. (Step 129-3). Then, after lighting for 0.6 seconds (step 129-4), in step 129-5, the above-mentioned A M
■ Store blank data (data that shows nothing on the display) and hold it for 0.6 seconds (Step 1
29-1). By repeating the above cycle,
This causes the display to flash 1.

If the life detection does not work, the process advances to step 127 and the normal sequence works. Is copy ON or NO for the main flow?
is determined, and when the copy is turned on, the drive system, etc.
Other temperature control il+41 (temperature control) and display control are performed in an interrupt flow.

Note that the interrupt timing is the rising edge of the zero cross signal.

First, let's explain the main flow. - First, when the copy switch 47e is turned on, the copy flag F
/ Since C0PY is sent, the process proceeds from step 127 to step 128 with the copy ON, and after determining whether the switch for disabling jam detection (JAM killing) is ON, the process enters step 130), and the main motor Lνil is activated. ON, document platen stop solenoid 5L10F
'F (When the main motor is ON, the document table moves backwards if the document platen stop solenoid 1i'li'' is on.), Stops the out-of-paper display (display P 7).
This does not change if there is no P oscillation), high voltage circuit H
V ON, do it. And step 131 in Figure 13
If the manual feed flag F/5HEETCOP'Y is set, check whether the paper is being fed manually. In the case of manual copying, this 7-lag F/5)-18ET Ct)PY is sent at step 363A of the interrupt flow of Figure 13. In the case of cassette paper feeding, in step 132, the cassette paper feeding solenoid 5L301 is turned ON and the timer C (timer C based on the rotaros signal) is activated, and when an overflow occurs, the cassette paper feeding solenoid pi, 301 is set to 01'E'.

The OFF of 5L 301 and the timer count are performed in step 380 of the interrupt flow. That is, step 380
-1, it is subtracted from the set value every time a zero cross pulse is input, and when an overflow occurs in step 380-2, the flag F/PLONI is reset and the cassette paper feed plunger 5L301 is turned OFF.

On the other hand, manual paper feed is 70 on standby before copy is turned on.
- When the interrupt processing is performed in steps 361 to 367 of the 13th diagram and the paper feed sensor Q2 is turned ON in step 363,
In step 363A, the above 77ygF'/5HEETC
Set OPY to Seriton and turn on manual paper feed solenoid SL4.
Reset the 72g F/5BPL and set the manual paper feed timer, subtract the timer in step 376A, and when the timer is ON in step 376A-1, set the manual paper feed solenoid SL4 in step 376A-2.
Execute the flow to turn on.

Next, in step 134, a pre-rotation timer is set. Here, since the determination result is first stored in the flag F/50 Hz in steps 405 and 406,
50/60 flz is determined, and based on the result, a timer clock value is set to nl when the frequency is 50 flz, and to n2 when the frequency is 6 Oflz. This)
A timer that measures time by counting zero-crossing pulses can set a substantially constant time regardless of the frequency. Then, in step 135, the time required for the document glass to reach the start position after backing up (for example, a 12th known timer, for example, 5 seconds) is set, so that even if the timer overflows, the document glass will not reach the start position. If not, outputs document glass back error. Note that if there is no particular disconnection with the internal timer, the timer measures time by counting zero-crossing pulses.

As mentioned above, the two timers work in parallel, and the starting position is determined by the two sensors Mβ3. When it is detected on MS4, first try MS3.
( ) (P, BP sensor) is not ON (at this time, the exposure lamp LAI is ON) 5. Then, when MS, i (register, stop position se/su) is ON, the start position is detected. In step 140, the original platen stop PL (original 8゛δ plate 1 stop solenoid 5L1) is turned on to stop the document platen.In step 141, the timer up for the previous rotation is checked, and the previous rotation is If it is not completed, step 138 is entered and the above operation is repeated.In step 137, if there is no detection by sensors MS3 and MS4 in steps 138 and 139, flag F1 is set.
0 P T OU'lI' is used to judge the abnormality of wrinkle removal. That is, step 137 is only for detecting an abnormality in the document table when the document table is not at the start position. In addition, flag F101)TQ! JJ' is reset in step 381 when the timer set in step 135 overflows.

As described above, when the pre-rotation is completed and the detections at steps 138 and 139 are OK, the process proceeds to step 142. In step 142, a determination is made as to whether the copy is manual copying or not, and if manual copying is being performed, the process proceeds to steps 159 and 160 and the sheet whitening advance operation is started.

If it is not a manual copy, the flag F is set in step 143.
/After resetting the cassette, in step 144, the presence or absence of paper is checked using the paper feed sensor Q2. If the transfer material has already been detected by the sensor in step 144, step 15
9, if the sensor is not sensed, the original platen abnormality detection timer is changed to a paper feed port delay timer in step 145, and transfer paper detection is waited until the timer is up. This up
If it is sensed during l, the process goes to step 159, but if it is not detected, in step 146, 7 lag F/Gi is set as paper fish detection, and the device is set after executing the post-mushi rotation in (6-B). to stop. During this time, as a paper fish, at steps 328 and 331 of interrupt -%70-,
:' flashes. If transfer paper is detected, proceed to step 15.9, turn off the document platen stop solenoid SLI, and then proceed to step 160 to advance the document platen 1) L (
S L 2 ) is turned on, and the time taken for the document table to move from the start position to the Back position (for example, the time it takes for the document table to move from position b to position f in Figure 12A) is set to be longer than that. Timer (7
, 0 seconds) for abnormality detection (step 16).
1).

In step 162, this document table abnormality is checked, and if an abnormality occurs, each drive section is turned off in (5-E) and subsequent steps 164, and 'E'' is displayed in step 164-1.
The oscillation of the engine 2 is displayed on the display 46a by displaying ``2'' for the time set in step 164-2 and for the time set in step 164-2, and the jam 2 is detected in the interrupt flow. lights up.

In step 166, the O of HP@BP sensor MS3
If FF is detected and it is determined in step 167 that it is a manual feed copy, the manual feed solenoid is turned on in step 168, and if the registration position sensor fvf S 4 is turned on in step 169, (5-F) It will be transferred to (5-F) Subsequent steps 171-
1 to 171-7, as shown in Table 3.4, the magnification 1 switch MS5. 0N10F of variable magnification 2 switch MS6
Each 7 lags are given as cents according to F. That is, MS5. When both MS6 are OFF, 7 lag F/E is set and 81s5ON.

When MS6OFF, 7lag li''/D is set, when MS5ON, MSGON, flag F/几1 is set, and when 1vis5OFF, MSGON, 7lag is set.
The lag F/R2 is set. Then, in step 171-8, the counter 1 for the timer color is cleared and the process moves to step 5-G).

Next, in step 173, it is determined whether or not the 7-lag F/BEG-1 is set, and if it is set, the discharge sensor Q3 performs detection in step 176. At this point, the 9th H4F, 5W (HP, I3P Sen?
A delayed JAM is checked until MS3) ON' (step 176-1), and after the above-mentioned period has elapsed, a delayed 14 JAM is checked until the next registration position sensor MS, i ON (step 191). In step 176, flag F/ejection is set in step 203 or step 204 when there is no delayed JAM and continuous copying, and at the initial stage (when the first copy is being made), the flag F/discharge is set at 7'. Therefore, step 176A is entered. When the paper ejection sensor Q3 is turned off in this step 176A, it is detected that there is no delayed jam, and the paper discharge sensor Q3 is set. If the flag F/ejection is set, step 176B is entered, and only when the OFF state of the ejection sensor Q3 is detected, the 7 lug F/extrusion is reset, and it is confirmed that there is no 1815jd J A M. Detected. In step 176-1, the reversal position is determined according to each order.

That is, in the enlargement mode, the magnification change 1 switch hi S5.

Since the two magnification change switches Δ:i85 are both off, when (I, P, SW) are turned on in step 176-IA, it is determined that it is the inversion position, and the process moves to (OC). Also, in the same magnification mode, the variable magnification 1 switch M S 5 is ON.

Since the variable magnification switch 8 186 is set to OFF, H, P, and SW are changed from ON to OFF in step 176-ID.
When the position reaches F, it is determined that the position is reversed and the process moves to 6-C). In addition, in the reduction 1 and 2 modes, since the magnification 2 switch 84S6 is ON, H, P, and S6 are turned on in step 176-IF.
Step 17
When it changes from OFF to ON at 6-IF, it is determined to be the reverse position and moves to 6-(-'').

Then, in step 176-2, the original platen=i helical solenoid SL2 is turned OFF, and the original +A8 moves backward.

Next, at snap 176-3, 7 lag F/Biasl is set, and at step 176-4, the value [cent] is set on counter 3. This counter (timer) 3 is for counting the timing for bias switching. Step 1
76-5, when the reduction mode is set, the exposure lamp L A l is turned off, and when the SW is turned off by the cam C4, the exposure lamp L A l is turned off.
, SW is turned on by cam 5) When the SW goes from OFF to ON, the exposure lamp is turned off, and in enlargement mode, the exposure lamp is turned off when the SW is turned from OFF to OFF by cam 5. This is to turn off the lamp.Next, when the flag F/discharge is set in step 178, the inlet device is stopped as a retained JAM (7-B).This retained JAM at the time of reversal
When there is no AM (7 lag F/discharge is reset in step 178), step 179 is entered and 72 lag F/discharge is reset.
'/5HEET C (Only when JP'l' is not set, subtract 1 from the costume device in step 180, and when it becomes 0 in step 181, set the flag F/5TOP and execute the stop sequence. Step 183 is to set the reverse abnormality timer, and performs the same thing as step 135. Paper solenoid 301 is set (step 1
86).

Then, in step 191, the resist S W M, S 4
The delayed JAM check continues in step 189 until the power is turned ON, and (step 189 SIJBJAM-Il'
i, J: The same control as step 176 in FIG. 16b is performed. ) If the paper discharge sensor Q3 has already detected in step 176 that there is no delayed jam, the flag F/discharge ■ is set, so a jam will not occur even if the sensor Q3 is OFF.

At step 196, the flag F/discharge ■ is reset. Next Regis) SWOFF', r step 198
Detect with. At this time, in step 201, the flag F/5
If TOP is not set, (4-B), (5-
B) Return to the beginning and repeat the above steps. When the flag F/5TOP is set, the original platen is stopped (step 205), and backward rotation begins.

At this time, the flag F/key disabled is reset to permit manual key power (step 206), the retention jam timer at the discharge port is set (step 207-1), and the high voltage circuit is all set to OFF (step 2 operation is executed). Thereafter, when the transfer paper is discharged from the discharge port in step 214, the process proceeds to step 2.
Idle rotation (post-rotation) is performed in steps 22-224. After performing the post-rotation, the main motor is stopped in step 229-3, and the halogen lamp e is turned off in step 260. After 0.7 seconds (step 231), in step 262, the document platen stop solenoid SLI is turned off to enter a standby state.

The interrupt flow is executed by the rising edge of the INT main molecule zero-cross pulse when no abnormality is detected while the main flow is flowing. Step 402~Step 4
06 is a flow for detecting the initial power supply frequency using an internal power supply interrupt as described above.

In step 302, it is checked whether the flag F/145 was set at the initial stage, and if it is not set, the process moves to step 303, and the halogen heater H1
is turned on. At step 604, flag F/initial 2
Check the seconds and if they are not set, step 34
2, the timer set in step 120 or 121 is decremented. Then, in step 645, the flag F/AUT is checked to see if the timer has expired.
Check O. If the timer has ended, the process moves to step 344, and the temperature detected by the thermistor is 145.
Check the flag F/145, which is set when the temperature is above ℃. If 7 sig F/145 is set in step 544, the process moves to (1, -B), and if it is not set, flag F/initial 2 seconds is set in step 345.

Then, in step 546, the flag F/AUTO, which is reset when the timer starts, is reset, and in step 34
At step 7, the disconnection detection timer (9 seconds) is activated and the process moves to (1-C). In step 305, the current temperature is 14'5
Check whether it is above ℃. The current temperature is 14
If the temperature is 5°C or higher, proceed to step 606 and set flag F.
/145 and F/155 are set and the wait is released. After the flag F/160 has been set, the energization to the halogen heater H1 can be controlled using SUB HC in step 361 in the standby state, and with SUB HC in step 369 during copying. In the 5UBHC, 185°C is the point, and when the temperature is below 185°C, intermittent energization of one cycle on/one cycle off is performed, and when the temperature is above 185°C, the halogen heater H1't is turned off.

In step 307, a timer (20 seconds) for detecting an abnormality in energization after the wait is released is set, and in step 608, the flag F/AUTO is reset. Then, in step 309, set 7 lug F/disconnection, and in step 31
Transition to 0. In step 310, the halogen heater H1
The flag F/heater OFF, which is set when F is off, is checked, and if it is not set, the timer that has been set is subtracted in step 311. Returning to step 305 again, the current temperature is set to 145 in step 605.
If the temperature is not higher than °C, the process moves to step 512, and flag F/disconnection is checked. If the flag F/disconnection is not set here, the process advances to step 613 and it is determined whether the current temperature is 70° or higher. The current temperature is 7
If it is 0° or more, the process moves to step 314'\ and sets a timer (30 seconds) for detecting an abnormality in energization, and then sets the flag F/ill in step 309. This timer is decremented in step 311. If the current temperature is not 70° C. or higher in step 16, the timer set in step 647 is subtracted in step 613A, and it is checked in step 315 whether the flag F/AUTO is set. If the flag F/AUT O is set in step 315,
Since the disconnection detection timer in step 347 has worked for 9 seconds (11 seconds after the power is turned on), E and n are oscillated in step 616 to output an abnormal output.

Returning to step 602 again, if the flag F/145 is set, the process moves to step 340 and the flag lj
'/155 is set. If flag F/155 is set, step 340
-1 to check whether the temperature is 250℃ or higher, 250℃
If it is 0 or more, it moves to (1-G) and displays an abnormality.

Otherwise, proceed to (3-A). If it has not been set, the halogen heater is turned on in step 341, and in step 342, the timer (1 second or 2 seconds) previously set in the main flow is decremented.

If the flag F/heater OFF is set in step 310, the process goes to step 617, and steps 317 to (2)
-A), the wait (power supply) rung is oscillated during the wait, and when there is no paper, the no paper 2 ring (displayed P) is oscillated. In this case, it is not the case that both the weight and the no paper oscillate at the same time.

That is, it is checked in step 617 whether the flag F to be set with paper fish/no paper is set, and if it is not set, it is checked in step 318 whether the weight is released. If the weight has been released, the process proceeds to (2,, -A). In addition, if there is no paper or if there is a wait, the timer (0, jS
It is determined whether the flag controlling the F/WAiT timer (ec timer) is set (step 319), and if it is not set, the flag F/WAiT timer is set at step '520, the timer is set, and from this set value Subtract 1 each time a zero cross signal is input.

When the predetermined time has elapsed, the process proceeds to step 625 or step 32B according to the determination result in step 3240 (J
, 6 S e c intervals, a blinking P is displayed on the segment display or a blinking display of the power lamp 48a is made.

Step 348 is the input state 'fr to the microcomputer Q203.
: This is a step in which the data is always stored in the memory of the computer; thereafter, this memory is used as the control VC of the device as needed. In step 549, a memory check is performed to determine whether or not GEE is accepted. This is when copying, including forward rotation (excluding backward rotation), is accepted. Steps 650-350B are 10 key 4
66 is turned ON continuously, the number of copies is automatically incremented by the timer of the subassembly 50A.

Step 351 checks whether the + key 466 is set, and steps 652 and 653 check whether the + key 466 is set.
6C1 step 354 is a check of the clear key 46d.

For example, when the + key 46b is pressed, if it is determined in step 651 that it is the + key 46b, 1 is added to the contents of the display RAM that stores the previous display data, and a carry is performed as necessary. Step 35
It is displayed on the segment display 46a at M-2.

In this segment display 46&, other data such as P without paper is displayed, but in step 351-2, after resetting the sound of the previous display data, the screen data is displayed. It is.

- When the key 46C is pressed, do the same in step 353.
-1? : The data subtracted through step 551-2
This is what will be newly displayed. When the clear key 46d is pressed in step 354, the contents of the display RAM
and this 1 is displayed in step 555. At the time of this display, the previous display data is reset and 1 is newly displayed.

Due to the characteristics of the drive circuit of the halogen heater H1, the heater control of this device turns on the halogen heater H1 by inputting a trigger pulse to the gate of the triac in synchronization with the zero-cross pulse.
When 1 is ON, it must be turned OFF after a predetermined timing. In step 356, if the Haloken heater H1 is on, it is turned off.

In step 3611, it is determined whether or not to copy, and during standby, key input of the sequence control means, etc., is checked in steps after step 361.

In this device, if a jam occurs in the sequence,
F/'JAM flag is set.

Then, the flag is checked in step 368, and in the case of a jam, the interrupt flow prohibits subsequent interrupts, turns the exposure lamp and heater 0OFF, and turns on the jam lamp (this ON is not a single flicker). static ON) is performed.

After fi (3-C), flag F/R, 1 is set directly when flag F/E is set, and after somsec count when flag F/I) is set. Time is 100m8
After counting ee, flag F7':R', 2. is set, step 368-. after counting 120m5ec. 14 resist shutter solenoid SL3
Turn on, and turn on bias switching circuits B and F. When this is turned on, the developing bias is switched to image forming.

Incidentally, in the development and time chart of FIG. , flag F/ROF
Set F=, set a value of 0.6 seconds to count 2, and reset flags F/E, F/DX F/R11, F/R;2.

Also, in step 368-8, the flag F/ROFF
is set, the process moves to step 568-9, and it is determined whether the counter 2 has counted 600 mBeC. When the counter 2 counts 600 mB e C, the process moves to step 56B-12, turns off the registration shirt solenoid SL3, turns off the manual paper feed solenoid 5L4tOFFL, and turns off the flag F/REG IST.
is set and the flag F'/ROF F is reset.
I pray for judgment whether it counted or not. Counter 6 is 700
m s e If you count C, stop.

In this way, in this example, the registration timing is switched according to the variable magnification mode, and the registration operation is always performed for a predetermined period of time regardless of the variable magnification mode (in this example, the registration timing is switched on according to the variable magnification mode). The aim is to carry out the following.

In step 669, heater control is performed, and when 185°C is detected, the heater is controlled to be turned on for one cycle and turned off for eleven cycles. In the Stesoge 370, a judgment is made as to whether or not it is a sheet copy.
For sheet copying, step 6 from Stesoge b70A
At step 77, the paper feed sensor Q2 is checked and the manual paper feed solenoid SL4 is operated. That is, when the paper feed sensor is turned ON, it is detected whether the manual paper feed plunger has already been driven for a predetermined time, and if it has been driven for a predetermined time, the process proceeds to step 377; otherwise, after subtraction, it is determined whether there is an overflow or not. After a predetermined period of time has passed by repeatedly passing through this loop, the manual paper feed solenoid SL is activated (without detecting an overflow).
4 is turned ON to continue transporting the transfer paper. However, if the manual paper is forcibly pulled out by the operator, the Stesoge 37OA to 375
, and before the predetermined time elapses, step 375-1i
Then, the manual paper feed solenoid SL4 is turned off to stop paper conveyance. This can prevent unnecessary operation of the device.

- After step 371, there is no checking of the copy key 47e1 stop key 46d, etc. and no manual display operation of the keys during cassette feeding copying. In other words, when the stop key 46d is pressed, the transition is made from the Stesoge 576 to the Stesoge 374, the display changes to i"l:1 in step 374, and then when the bivy key is turned on in step 671, the initial setting stored in the display RAM■ The value is RAM■
RAM(i) is displayed on the display (step sy 5A). In other words, the initial set number of sheets is restored. In the stem gears 577 to 378, subtraction of the timer clock such as 011 rotation, post rotation, etc. and time up (overflow) are checked.

In addition, in step 378, the count up is 7 lag F/A.
U T O is set. Steps 679-580
Then, check the subtraction of the timer clock and time up of the cassette paper feeding solenoid 5L301.
After p, the cassette paper feed solenoid is turned off. In steps 581 to 1-E, a timer for detecting an abnormality on the original platen is activated and checked. Thereafter, the process returns to (1-E) and the above-described operation is repeated.

〔effect〕

As described in detail above, according to the present invention, the resist operation is always performed for a predetermined period of time regardless of the variable magnification mode, so that a stable resist operation can be performed.

[Brief explanation of the drawing]

1 is a perspective view of a copying apparatus having a variable magnification mode to which the present invention is applied; FIG. 2 is a sectional view of the copying apparatus shown in FIG. 1;
6 shows the display section and operation section, a is a top view of the display section provided on the cassette, b is a display section provided on the main body, FIG. 4 is a control circuit diagram of the copying machine shown in FIG. 1, and FIG. Figure 5 is a signal waveform diagram at each part in Figure 4, where a is a signal waveform diagram on the signal line S1, b is a signal waveform diagram on the signal line S2, and Figure 6 is a diagram of the signal waveform on the signal line S2.
In the signal waveform diagram on signal line S2 in Figure 4, tzca is 5oH.
z signal waveform diagram, b is a signal waveform diagram of 60Hz, FIG. 7 is a signal waveform diagram at an abnormality, a is a signal waveform diagram on signal line S1 in FIG. 4, and b is a signal waveform diagram on signal line S2. A waveform diagram, FIG. 8 is a diagram showing the relationship between the input/output child of the control unit in FIG. 4, the sensor and the key, and FIG. 9 is a diagram showing the input signal waveform of the iNT terminal in FIG. 4 and the output terminals R11, R, 12. , R13; FIG. 10 is a diagram showing the relationship between the output terminal of the control section in FIG. 4 and the drive section; FIG. 11 is a diagram for explaining temperature control in this embodiment; Figures 12A-C are diagrams showing the cam arrangement and microswitch operation in each mode, Figures 13 α to h are control flowcharts, and Figure 14 α
-h are diagrams showing operation timing charts of each component of the copying apparatus. Here, 1 is a document placement table, 3 is a photosensitive drum, 7 is a registration shutter, Q2 is a paper feed sensor, Q3 is a paper ejection sensor, and TH
l is a thermistor, Hl is a halogen heater, LAl is a halogen lamp, 1oa is a fixing roller, 11 is a paper ejection roller,
SL1 is the document platen stop solenoid, SL2 is the document platen advance solenoid, SL3? 'i Registration shutter solenoid, 5L301 is a cassette paper feed solenoid, Ml is a motor, 46a is a segment display, 46b. 46c is a copy number setting key, 46d is a clear/stop key, 47e is a copy key, 48a is a power lamp, 4
8b is a jam indicator, and Q203 is a microcomputer. Kidney 1-Ichijikanr

Claims (1)

[Claims] In a recording device that has a variable magnification function and switches the registration timing of transfer paper fed from a feeding unit according to the variable magnification mode, the registration operation of the transfer paper is always performed for a predetermined period of time regardless of the variable magnification mode. A recording device characterized by a force-like structure.