JPS60113578A - Picture recorder - Google Patents

Abstract

PURPOSE:To provide for the next resumption of copying by stopping instantaneously a photosensitive body drum driving motor at the time of jam occurrence, by displaying the jam, and by resetting the optical system such as an original platen to the original position automatically. CONSTITUTION:When a magnification of copying is set and a copy start key is pressed down, a master CPU225 transmits the magnification information to a microcomputer 200, and a phase comparation signal PC and a speed control signal FV are formed based on the information. After the phase comparation signal PC and the speed control signal FV are added, they are PWM-modulated, and are set as the control signal of an optical system driving motor 100. An encoder 226 is provided for the optical system driving motor 100, and the speed is controlled by inputting the encoder signal to the microcomputer 200 as an interruption signal. When abnormality is detected from the speed of an original platen 101, the microcomputer 200 informs the abnormality to the master CPU225, and the master CPU resets the original stand 101 to the prescribed position by going back. In addition, the abnormality display is executed for the operation part, and the movement of the copying stops.

Description

Detailed Description of the Invention [Technical Field] The present invention provides an image recording apparatus having an optical scanner, and particularly, when an abnormality occurs in image recording processing, the scanner drive motor is stopped and the scanner is moved to the home position. This invention relates to a device for restoring

[Prior art]

Conventionally, in this type of image recording device, such as a copying machine, when the recording paper jams (paper jam) during a copying operation, it is necessary to stop the copying machine immediately, and the time when the jam occurs Since the drive motor was stopped at the time of the jam, the optical system returned to the home position after clearing the jam and restarted the next viper photographing operation, which resulted in a long restart process time. Furthermore, in copying machines with a moving optical document table, the document table does not stop at the home position, which may interfere with other operations.Especially in the case of a DC motor, manual operation is required. There was a problem in that it was heavy and required a lot of work to prepare for return.

〔the purpose〕

The present invention has been made in view of the above-mentioned problems, and in order to eliminate the above-mentioned drawbacks, when a jam occurs, the photoreceptor drum drive motor immediately stops and a jam indication is performed. The entire purpose is to automatically return the optical systems such as the above to their home positions in preparation for the next restart of copying.

〔Example〕

The present invention will be explained below based on the drawings. 1 to 4 are explanatory diagrams of an embodiment of the copying machine of the present invention.

FIG. 1 is a schematic side view of its configuration, where 101 is an optical system scanner (original table), 100 is an optical system drive DC motor (M, ) that drives this scanner 101 (+1);
02 is a main DC motor (M2) that drives the photosensitive drum 103 by +1σ1.

Further, 104 and 105 are home position detectors, 1
06,107 indicates a jam detector.

This copying machine drives a drum 103, a fixing device 110, and a paper conveyance section 109 by a drum drive motor 102.
The optical system drive motor 100 drives only the document table 101. The drum drive motor 102 is controlled to rotate in one direction at a predetermined rotation speed, and the optical system drive motor 100 is controlled in both rotation directions to a rotation speed that matches the set magnification, and there is no relationship between these two. The rotation speed of the optical system drive motor 100 is calculated and controlled independently to match the rotation speed of the drum drive motor 102.

FIG. 2 shows an optical system scanner 101 and an optical system drive motor 1.
00, main motor 10 that drives the photosensitive drum 103
This is an example of the second speed control circuit.

In the figure, 200 is a CPU of a microcomputer (hereinafter referred to as microcomputer) that controls the motor speed;
202 is a counter (1) inside the microcomputer, which is a circuit for creating a base frequency FS; 204 is also a counter (2) inside the microcomputer's CPU 200, which is the same as an encoder output signal FG, which will be described later.

This circuit is used to generate a speed control signal FV of constant width pulses in accordance with motor speed designation (magnification information). 205 is the boat output of the integrator that is quickly selected depending on the magnification, and 207 and 208 are the phase comparison signals P.
An amplifier 209 that amplifies C and the speed control signal FV,
211 is an integrator that integrates the added signals; 215 and 216 are comparators that perform pulse width modulation (hereinafter referred to as PWM);
17. 218, 219, and 220 are H-type drivers that drive the optical system drive motor designated by the same number 100 as in FIG. 1; 226 is an encoder (F, ) attached to the motor 100; 222 is a guarantee 7t)
) transistor, 231, each control signal 228
．． 229.230 and the optical system drive motor 10
Ethical circuit of how to control 0, 213, 21
4 is a reference voltage setter. Reference numeral 256 denotes a phase-locked loop (hereinafter referred to as PLL) control IC 1253 for controlling the photoreceptor drum drive motor indicated by the same reference numeral 102 as in FIG.
.

Adder for adding FV, 254 is a rectangular wave generation circuit, 25
5 is an integrator, 252 is a comparator that creates the PWM signal, 259 is a driver that drives the drum drive motor 102, and 260 is an encoder (Q) attached to the motor 102.

Next, the operation will be explained based on FIG.

When the copy magnification is set and the copy start key is pressed, the master CPU 225 transmits magnification information to the microcomputer (motor control CPU) 200 via the serial communication line 234. It also outputs a main motor (drum drive motor 102) ON signal 250, and outputs an ON signal 250 to the PLL control IC.
256 is brought into operation, and the amplifier 253 adds the phase comparison signal PC of this PLL control c256 and the speed control signal FV. Further, the rectangular wave obtained by the rectangular wave oscillation circuit 254 is integrated by an integrator 255 to create a triangular wave. The PC, FV addition signal and this triangular wave are connected to a comparator 25.
2 and outputs a PWM signal. Next this PWM
Input the signal to Dryno (259) and connect it to the main motor 102.
The encoder 260 attached to the main motor 1102 is inputted to the PLL control IC 256, and by comparing the phase of the reference frequency divided from the clock generation circuit 257 and the encoder signal, the main motor 1102 is controlled to a predetermined speed. Further, the resistor 258 is a resistor for detecting current, and especially when starting the main motor 102, a rush current flows, so this resistor 258 detects it and the current limiter circuit 2
This is to activate the dry nozzle 51 and turn off the dry nozzle 259.

On the other hand, regarding the optical system drive motor 100, when the copy start signal is input, the master CPU 225 sends out the optical system Forward, 5tart signal 228° 229, and the ethical circuit 231 activates the Forward ON.
Signal and Forward Reference Voltage1. An f selection signal is created.

The cutting magnification t is sent via the serial communication line 234.
The motor control CPU 200 decodes the W signal, sends the result back to the master CPU 225, and if the results are the same, the reference frequency creation unit 202 starts a timer to create a reference frequency @FS that matches the magnification. Determine the count value. A signal for selecting the capacitor of the integrator 211 is outputted according to the multiplication factor, and only the selected analog switch 233 is opened. Furthermore, a count value for operating the speed control signal FV generation section 204 is determined from the magnification information.

The phase error (comparison) signal PC and speed control signal FV output from the motor control CPU 200 are each amplified by amplifiers 207 and 208, then added by an adder 209, and integrated by an integrator 211. is compared with the comparator 215, and PWM
Create a signal. This PWM signal is input to the driver 217, and since the driver 220 is turned on by the logic circuit 231, the PWM signal is input to the optical system drive motor 100. 4? t flows, and the motor 100 is controlled so as to keep constant the phase of the reference frequency FS according to the magnification information and the encoder feedback signal FG from the encoder 226 which is provided several times to the motor 100.

Further, the resistor 221 is for current detection, and this current is connected to the current limiter circuit 223 and the analog input 261 of the motor control CPU 200.
0, the emitter 223 that sends 'i(E) operates to turn off the driver 220.

For overcurrent detection, the motor control CPU 20
0 analog human power 262, and if it is above a predetermined level, the driver retention transistor 222 is turned off. For example, if the drivers 217 and 219 are both turned ON, an overcurrent will flow because the power supply and GND will be short-circuited. At this time, overcurrent detection is activated. The driver voltage protection transistor 222 is normally in an ON state. Also,
The switch 232 is an optical system overrun switch, and if an overrun occurs, this switch is opened to forcibly stop the motor 100.

Since the forward time is determined by the master CPU 225 based on the magnification information, cassette size, etc., the back signal is manually input after the forward signal 228 is ON for a certain period of time. Next, regarding Back, For
ward, but it is controlled only by the speed control signal FV without using the phase error signal PC.

When the master CPU 225 detects the home position of the optical scanner 101 during the Back operation, a Back signal is output for a certain period of time, only the driver 220 is turned on, and a dynamic brake is applied to move the scanner 101
to stop at a fixed position.

Here, 22γ shown in FIG. 2 is a bipolar electrolytic capacitor, which is connected in parallel to the optical system drive motor 100. This is done by locking the phase when the motor 100 is controlled to a predetermined speed, that is, when the phase difference between the reference frequency FS and the motor encoder feedback signal FG is constant. This is called the state where the lock is in place, and the purpose is to strengthen the lock, that is, to prevent the lock from being released even when the load becomes large. Especially in copying machines with a movable document table,
This is because the moving document table may be held down by the operator's hands. Also, this conde.

By adding the sensor 227, it becomes possible to control a wide range of motor rotation speeds, such as when performing continuous magnification change.

Next, the phase error signal F'C and the speed control signal FV
The control method is shown in the program operation flowcharts of FIGS. 3-1 and 3-2, and will be explained step by step.

After the power is turned on, the motor control CPU (200 in FIG. 2) is first activated, and the MAIN program is started as shown in FIG. 3-1, and initial settings of the boat, etc. are performed.

(Step 300). Next, the motor control CPU 200 receives magnification information from the master CPU 225 through the serial communication line 234 (step 301).

To decipher this magnification, step 302), vs.
Step 3: Check with the 25 side and send the data.
03), optical system drive motor 100 from the decoded magnification information
A timer count value is added to create a reference frequency FS and a speed control signal FV to match the set speed of (step 304). The method for creating the reference frequency FS is as follows: After the counter 1 finishes counting down, an interrupt signal is generated and the counter 1 is automatically reset and the countdown is returned to green. It will be done.

Further, the encoder signal of the encoder 226 attached to the optical system drive motor 100 is expressed as motor y>to C1.
-, #Input to the CPU 200 as an interrupt signal (Fig. 2
3), it is possible to judge whether the speed control is being performed accurately by counting the number of reference frequencies and the number of reference frequencies determined by the setting magnification. If the speed is too fast, the motor control CPU 200 performs a self-diagnosis and detects an abnormality (step 304), and then notifies the master CPU 225 of the abnormality through serial transmission in step 303. When the master CPU 225 side receives the abnormality signal, it sends a Back signal to the drive circuit of the optical system drive motor 100 to move the document table 101 backward and stop it at a predetermined home position.

Further, after stopping, the master CPU 225 displays an abnormality display on the operation unit and stops the close-up operation.

Also, the speed detector may be out of order and the speed signal (encoder signal) is not output (always "H").

or °L state), when a command to rotate the motor 100 is output, the motor control CPU 200
By monitoring the encoder signal of the optical system drive motor 100, abnormalities in the speed detector can be confirmed.

Then, the self-diagnosis program diagnoses the abnormality and notifies the master CPU 225 in the same manner as described above.

Next, the speed control signal FV will be explained.

The 'fMBl control signal FV generation unit 204 in the motor control CPU 200 shown in FIG. 2 generates the FV interrupt in FIG. 3-1 and the FG? in FIG. 3-2. This corresponds to a program that includes JJ. Encoder 22 of optical system drive motor 100
When the encoder feedback signal FG from 6 falls, an FG interrupt is entered, and after saving the register (step 321), the speed control signal FV is reset (step 322), and the count value corresponding to the multiplication factor is stored in the already mentioned counter (2). After the counter (2) has finished counting down, an FV interrupt occurs, and after saving the register (step 305 in Figure 3-1), the FV is set (step 306). , Fv times the signal, and then restore the register (step 307).

FIG. 4 shows a waveform diagram of each signal. The phase comparison signal PC is the reference frequency signal FS when the phase difference is 0 to 2π, and the phase comparison signal PC is repeatedly set and reset at the falling edge of the encoder feedback signal FG, and when the phase of the feedback signal FG is delayed by 2π or more, the phase comparison signal PC is set and reset. , the phase comparison signal PC maintains the set state,
After detecting that the feedback signal FG falls twice during one cycle of the reference frequency signal FS, the phase difference 0 to
Repeat the 2π operation. Conversely, if the phase of the feedback signal FG advances, that is, if the phase difference becomes less than O,
The phase comparison signal PC maintains the reset state, and the feedback signal F
After detecting that the reference frequency signal FS has fallen twice during one cycle of G.

Then, the above-mentioned operation with a phase difference of 0 to 2π is repeated.

Based on the above @3-21J, optical system 10
1 moves forward.

As shown in FIG. 4, the phase comparison signal PC has a phase difference of O~
In the state of 2π, the FS is always enabled and the FG input counter is -1, so the PC board of the motor control CPU 200 must be set by the FS interrupt signal through each step 308, 309, 310, and 316. Step 317), clears the counter that counts the number of FG interrupts (step 313), then increments the counter that counts the number of FG interrupts (step 314), enables interrupts at the same time as register restoration (step 315), and returns do. This series of steps enables the FG interrupt signal.

Next, in the same way as described above, FG is enabled, and since the Fs input counter is in the state of 1, the FG interrupt signal is used to reset the PC board through each step 324, 325, and 331 (step 332), the number of FG interrupts. Step 328), F(d?l) to clear the counter that counts
The counter for counting the number of J inputs is incremented (step 329), interrupts are enabled at the same time as the register is restored (step 330), and the process returns. This series of steps manages the FS interrupt number.

That is, the FG interrupt signal and the FS interrupt signal are sent alternately.

If the phase difference in Fig. 4 is 2π or more, FS is initially permitted;
Since the FG input counter is in the state of 0, as described above, go through each step 308, 309, 310, 316 to set the PC board (Stella 7'317), and clear the counter that counts the number of FG interrupts. Next, step 313) counts up the counter that counts the number of FG interrupts, and at the same time as the register is restored, interrupts are enabled (step 315). °0'' state - (step 310), set the PC board (311), set the FGy stop flag (step 312), clear the counter that counts the number of FG interrupts (step 313), FSVfl
A counter for counting the number of interrupts is counted up (step 314), and interrupts are enabled at the same time as the register is restored (step 315). Make a J-turn. In this state, since FG is prohibited and the FS input counter is NO, each step 324, 333, 328, 329, 330 is passed and the optical system drive motor 10 is connected to the driver 21γ (Fig. 2).
PWM is driven to advance the phase of 0. Here, the driver 220 is in the ON state.

The phase of the feedback signal FG advances, the FG interrupt signal is input manually, and when the number of FG interrupts reaches °0, Stella 7'324
, 333 to reset the PC boat (Step 334), reset the flag to allow FS, FG interrupts (Step 335), Step 329
, 330. After this, the above-mentioned phase difference state of 0 to 2π will be reversed.

Conversely, when the phase of the feedback signal FG is advanced, the same operation is performed as when the phase is delayed, except that the relationship between FS and FG is reversed, and each step 326, 327, 318
, 319, 320, the driver 217 is driven by PWM, and the phase difference is 0 to 2.
It is controlled so that it becomes π. Although this motor 100 is driven by PwM, it may also be driven by DC level.

In addition, 235 in FIG. 2 is an LE that displays the phase le.
It is D. The number of phase difference display LEDs is 3 as shown in the figure.
The selection method will be explained using FIG. 3-1 and FIG. 3-2.

The count value of the reference frequency FS obtained by the set magnification is divided into three equal parts and stored in the memory (step 304).
. The above-mentioned counter (
1) is read (step 331), and compared with the FS count value FS/, 3°2FS/3 (step 336), it is determined which phase difference display LED 235 is to be lit, and the voltage is Output (step 337).

Finally, as a summary, an overview of the tooth thickness sequence will be explained based on FIG.

When the copy start key on the operation unit of the copying machine is pressed, the photosensitive drum drive motor 102 is controlled to rotate at a constant speed as described above, and the optical system scanner (original platen)
The drive motor 100 is also controlled to a rotation speed suitable for the set magnification. Recording paper is fed by the paper feed roller 108,
The latent image formed on the photoreceptor drum 103-H by the exposure lamp is developed by a developing device and transferred to recording paper, and then transferred to the conveying section 1.
Thirteen sheets of paper are conveyed by 09 and fixed by the fixing device 110.

Jam detectors 106 and 107 are provided on the ejecting unit 109 and the fixing unit 110, respectively, so if for some reason the paper is not fed even after a certain period of time, or if the paper stays for more than two specified periods. If so, it will be detected by the jam detector, and the master CPU 225 will
It is determined that this is an abnormal operation, and the optical scanner (document glass)
In order to pull the document table 101 back to the home position, the forward m signal is cut off to the motor control CPU 200 of the microcomputer, and a backward signal is sent to the microcomputer's motor control CPU 200 to automatically pull the document table 101 back to the predetermined home position.

〔effect〕

The above is based on the examples! As described above, according to the present invention, when an abnormality occurs in the image recording processing operation, the drive mode is immediately stopped, and the optical system scanner such as the document table is automatically moved to a predetermined home position. Since it is now possible to pull back the copy operation, the processing time for resuming the next copy operation can be shortened.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams of one embodiment of the present invention,
Fig. 1 shows its configuration (preliminary diagram), Fig. 2 is a speed control circuit diagram of the optical system drive motor and photoreceptor drum drive motor, and Fig. 3-IFA and Fig. 3-2 are its program operation flowcharts. , FIG. 4 is a waveform diagram of each signal. 100... Optical system drive morph 101...
...... Optical scanner (original table) 102 ...
...Photosensitive drum drive motor 103...
...Photosensitive drum 104.105...Home position detector 106.107...Jam detector 200...Motor control CPU2
02...Reference frequency creation section 204...
... Speed control signal creation section 217, 218, 21
9,220...H type driver 222...
... Time keeping transistor (driver) 225 ...
...Mask CPU226.260...Encoder 227...Bipolar electrolytic capacitor 23
1...Ethical circuit 235...LED

Claims (1)

[Claims] In an image recording apparatus that drives an optical scanner by at least one motor, the optical scanner is controlled at a constant speed by a speed detector associated with the motor and an output signal obtained from the speed detector. a control means for detecting a home position of the optical scanner; a detection means for detecting a home position of the optical scanner; and an image recording processing operation abnormality detection means, and when an abnormality signal is obtained from the abnormality detection means during the recording processing operation, the An image recording apparatus characterized in that the optical system scanner is pulled back to the home position and the motor is stopped.