JPH0778692B2 - Document scanning device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a document scanning device having a reciprocating member for scanning a document.

2. Description of the Related Art Conventionally, in a copying machine or the like that performs exposure scanning by moving an exposure unit along a document placed on a document table, a drive that drives the exposure unit when the exposure unit that has completed the exposure scanning reaches a predetermined position. The exposure unit is decelerated due to friction of movable parts such as wires and rails that support the exposure unit, and the exposure unit is stopped or moved by hitting the exposure unit against a cushion or the like. The exposure unit is stopped by applying a driving force in the opposite direction to the exposure unit for a predetermined time. Then, the exposure unit is moved from the stopped position to perform the next exposure scanning.

However, if the surrounding environmental conditions change or the movable part supporting the exposure part wears down, the friction coefficient of the movable part changes.

Therefore, in the case of the conventional configuration as described above, if the friction coefficient of the movable part changes, the stop position of the exposure part, that is, the movement start position of the exposure part in the next exposure scan will vary.

Therefore, in the conventional apparatus of this type, it is impossible to copy the image of the original document to a predetermined position on the recording paper because the movement start position of the exposure unit in the exposure scanning varies.

There is also a method of correcting the stop position by driving the exposure section again after the exposure section stops, but this method is inefficient because it takes time until the next exposure starts.

The present invention is made in view of the above problems,
An object of the invention is to provide a document scanning device capable of accurately and quickly stopping a reciprocating member for scanning a document at a stop target position.

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

FIG. 1 is a schematic sectional view of a copying machine to which the present invention can be applied, and the outline of the structure and operation of the embodiment will be described based on this drawing.

The surface of the drum 1 is made of a seamless photosensitive member using a photoconductive layer, is rotatably supported on the shaft, and is moved in the direction of the arrow by the main motor operated by the push button of the copy key (106) shown in FIG. Start spinning.

When the drum 1 becomes a predetermined rotation and the potential control process (pre-processing) described later is completed, the document placed on the document table glass 26 is illuminated by the illumination lamp 21 which is integrally formed with the first scanning mirror 22, and The reflected light is scanned by the first scanning mirror 22 and the second scanning mirror 23. The first scanning mirror 22 and the second scanning mirror 23 move at a speed ratio of 1: 0.5, so that the original is scanned while the optical path length in front of the zoom lens 20 is always kept constant.

The reflected light is generated by the zoom lens 20, the third mirror 25, the fourth
After passing through the mirror 24, an image is formed at the exposure section A on the drum 1.
The drum 1 is composed of a pre-electrification lamp, and is pre-electrified by the pre-electrification means 9, and is then corona-charged (eg, plus (+)-charged) by the charger 2. After that, the image irradiated by the exposure unit A is subjected to slit exposure. By this slit exposure, an electrostatic latent image with a residual charge is formed on the black portion of the document. Drum 1
The electrostatic latent image formed on the electrostatic latent image is developed by the developing roller of the developing device 4 to be visualized as a toner image, and the toner image is transferred to the transfer paper fed by the transfer charger 5. .

Next, an outline of transfer paper feed control will be described.

The transfer paper in the upper cassette 13 or the lower cassette 14 is fed to the main body of the copying machine by the sheet feeding stepping motor 11 or 12, and is fed to the photosensitive drum 1 in the correct timing by the register roller 10. , The leading edge of the latent image and the leading edge of the paper are aligned at the transfer section. Then, the toner image on the drum 1 is transferred onto the transfer paper while the transfer paper passes between the transfer charger 5 and the drum 1.

After the transfer is completed, the transfer sheet is separated from the drum 1 by the separation static eliminator 6, guided to the fixing rollers 17 and 18 by the conveyor belt 16, fixed by pressure and heating, and then discharged to the outside of the copying machine by the discharge roller. It

After completion of fixing, the fixing roller is cleaned by the web 19.

After the transfer, the drum 1 continues to rotate, and the toner collected by cleaning the surface of the drum 1 with a cleaning device 8 including a cleaning roller and an elastic blade is collected in a discharged toner container by a pipe (not shown). Go to the cycle.

Reference numeral 200 is a pedestal that has 2000 sheets of ink that can be separated from the copying machine main body 100 and intermediate toner for double-sided copying.

Reference numeral 46 in the pedestal 200 is a lifter of 2000 sheets, and lifts up according to the amount of paper so that the paper 45 always hits the paper feed roller 44.

When copying on both sides, the flapper 31 of the main body is raised to guide the copied paper to the side of the pedestal 200, and is stored in the intermediate tray 47 through the conveyance path 40 of the pedestal. 49 is a paper size control plate for the intermediate tray, which moves according to the paper size to be stored. The intermediate tray 47 can store up to 99 sheets. Next, at the time of double-sided copying, the copy paper is fed from the intermediate tray 47, and the copy paper passes through the path 48 by the paper feed rollers 41 and 43 and the separation roller 42.
It is guided to the registration roller 10 of 00. 300 is an automatic document feeder (ADF), 50 is a paper feed tray for setting originals, and 55 is a paper feed tray.
Is a paper ejection tray. When the copy start is applied from the main body 100, the original is fed by the paper feed roller 51, and is conveyed by the conveyance roller 53 and the separation roller 52 for preventing double feeding.
The original is guided to 54, set at a predetermined position on the glass surface 26 of the main body 100, and the copy operation is started. When a series of copying operations on the original document is completed, the original document is ejected to the paper ejection tray 55 via the conveyance belt 54 and the paper ejection belt 56. While the original is in the paper feed tray 50, the next original is fed simultaneously with the paper discharge operation. The automatic document feeder may be a document processing device (RDF) having a recirculation path and a document reversing device. 400 is a collator (sorter) that collates the copies discharged from the main body. 62 is a non-sort bin and sort bin 66 is
Since there are only 20 bottles, when sorting is unnecessary, or 1
When the number of copies from the original is 21 or more, or when an interrupt copy occurs in the main body 100, the paper is ejected to a bin of 66. Flats
Reference numeral 64 is a flapper for feeding paper to the next sorter when using a plurality of sorters.

Next, a detailed description of each part will be given.

FIG. 2 is a block diagram of the control unit of the copying machine of FIG. 1. In the figure, Q101 is a ROM memory storing the program shown by the flow chart of FIGS. 12 (A) to (I) in the instruction code routine. , A main CPU, which is a one-chip microcomputer with a built-in RAM memory that stores various processing data and an I / O port that controls input and output, Q10
Reference numeral 2 is a one-chip microcomputer equivalent to the main CPU (Q101), which is a slave CPU in which the ROM memory stores the programs shown by the flow charts in FIGS. 13 (A) to (r). (Q101), slave CPU
Both (Q102) have a built-in A / D converter and are also used for temperature control and adjustment volume input. Q103 to Q106 are main
It is an expansion I / O port for expanding the input / output of the CPU (Q101) and is controlled by the data bus and control signals from the main CPU (Q101). Q107 and Q108 are the main CPU (Q
It is a one-chip micro computer equivalent to 101),
ADF for controlling the automatic document feeder (ADF) 300 shown in FIG.
For sorting CPU and sorter (sorter) 400 control
It is a CPU, and a serial communication path (TX
D, RXD, SCK) are connected to each other, and the document feed control and the collating device (sorter) control are instructed and controlled by serial communication.

FIG. 3 is a plan view of the operation unit. In the figure, 102 to 115 are keys, 102 is a numerical key for setting the number of copies, 103 is a clear key for canceling the numerical value, 104 is a copy key of the number set by the numerical keys 102 before completion of copying. An interrupt key for executing another number of copies, 106 is a copy key for instructing the start of copying, and 105
Is a stop key for stopping the copy operation during the continuous copying of the number of sets, and 110 is a paper feed cassette selection key, and the effective paper feed cassette is sequentially selected from the upper, middle and lower stages for each push button. Reference numeral 111 denotes a double-sided copy key for selecting double-sided copy. When this key is pressed, the display 121 of the display unit 101 displays "1", indicating the first side of double-sided copy. When the copying of the first side is completed, the display 121 automatically displays "2" to instruct the copying of the second side. This display pattern is shown in FIG.

Reference numeral 115 denotes a magnification changeover key, which is a key for designating four magnification modes of enlargement, reduction, equal magnification, and continuous magnification, and each time the key is pressed, the magnification mode becomes equal magnification → reduction → enlargement → continuous → equal magnification mode. Rotate. FIG. 4-2 shows a display example of the displays 132 and 133 when this key is pressed. Display 132,133 during continuous zooming
Nothing is displayed, and 134 is instructed by the magnification of the percentage display. The magnification is 61 to 141% and is designated with the keys 113 and 112 in units of 1%. Further, reference numeral 114 is a magnification selection key for setting a fixed size variable magnification in the magnification mode selected in 115. That is 115
When the reduction mode is set with, the standard reduction ratio is automatically set according to the cassette size selected at that time. For example, if A4 size vertical feed cassette: A4R is selected, every time key 114 is pressed, A3 → A4: 71%, B4 → A4: 82
%, A3 → B4: 87%, B4 → B5: 71%, A3 → B5: 61%, A4 → B5: 87%
It changes like that. % Always displays the magnification at 134 at the same time as 132,133 is changed. A display example in this case is shown in FIG. 4-3. The up / down keys 112, 113 for continuous variable magnification are up or down by 1% for each push button of each key, and if the button is continuously pressed for 1 second, it is continuously up or down while the push button is pressed. When it goes up to 141%, it automatically returns to 61% and tries again, and when it goes below 61%
It becomes 141% and goes down.

The standard three-digit numerical display 134 is to display 135 "%" in% display for magnification, but it can be switched to various displays described later by using the display switch in the main body for adjustment during maintenance. It is possible. Also, when the magnification is specified with the down-key 112 or 113 for continuous scaling, if the scaling factor matches the scaling factor for standard scaling, the scaling is displayed in relation to the size of the selected cassette or in relation to the original. Can also be displayed together. In this way the display 134
Is a three-digit numerical display, but normally the magnification is displayed as a percentage and 135 "%" is displayed as described above. But,
When the power is turned on, the temperature of the fixing device is shown, and 136 "° C" is displayed. In this embodiment, when the temperature of the fixing device reaches 170 ° C., the low speed rotation is started, and at 180 ° C., the high speed rotation is started, and the copying machine is in a standby state. However, when the temperature is low, it takes several minutes until the temperature of the fixing device reaches a predetermined temperature after the power is turned on, and the operator may feel that the waiting time is long. Therefore, the temperature is displayed using the display unit 134 from power-on to standby. The temperature of the fixing device is input from the fixing thermistor 210 of FIG. 2 to the A / D input terminal of the main CPU (Q101), converted into temperature, and the display on the 134 display unit is updated every 700 msec. In the standby state, the display 134 automatically returns to the magnification display. Further, the display 134 can be displayed differently by operating a changeover switch in the copying machine by a serviceman or the like during factory adjustment or maintenance work. This display can be made as shown in Table 1 by using the switches of DMS0 to DMS3 in FIG. 7-1.

Various adjustments are facilitated by using these displays. Here, the display unit "V" uses the display of 137.

The set value of the fuser temperature control setting volume 206 shown in FIG. 2 can be read as the temperature setting volume display directly from the input data from the volume 206 in the above table. This volume 20
The main CPU (Q101) reads the setting value of 6 to make the temperature setting of the fixing device variable, and at the same time, the temperature of low speed and high speed rotation when the power is turned on is relatively changed.

124 to 128 are warning displays and all are displayed as pictograms. A key counter confirmation display 124 is displayed when a key counter for counting the number of copies is not inserted in the socket of the main body. 125 is displayed when there is no cassette in the cassette stand selected in the paper / cassette supply display, or when there is no paper in the cassette. Reference numeral 126 denotes a developer replenishment display, which is displayed when the amount of developer in the developing device falls below a specified amount.
127 is a paper feed check display, which is displayed when paper is jammed in the machine. 128 is a discharge toner full display, which is displayed when the toner used once is full. Reference numeral 122 denotes a weight display, which is lit when the power switch is turned on and the temperature of the fixing heater is lower than a specified value, and is turned off when the temperature exceeds the specified value and the weight UP processing is completed. Reference numeral 123 denotes an interrupt display, which displays the interrupt 104 when the push button is pressed and turns off when the interrupt processing is completed. Reference numeral 129 indicates the upper, middle, and lower rows of the cassette selected by the cassette selection key 110, and 119 displays the size of the selected cassette. When using the standard scaling, the recommended size of 119 will flash if the specified size does not match the cassette size. Reference numeral 107 is an automatic exposure control (AE) selection key, and keys 108 and 109 are manual density adjustment keys. AE
When is selected, 117 is displayed, the density adjustment of the manual is ignored, and a clear image with no fog is always obtained for the original. Further, in the AE mode, the density adjustment display 118 displays the results measured at the time of AE scanning in 17 steps. Key 108,10
9 is effective when not in the AE mode. When the key 108 is pressed, the bar graph display 118 extends upward, and when the key 109 is pressed, the bar graph display 118 descends. The standard is displayed as a bar graph in the center. If both keys 108 and 109 are pressed for 1 second, the keys 108 and 109 continuously go up or down. 10 from the standard in Fig. 4-4
An example of changes when 8 is pressed is shown below. Reference numeral 116 is a three-digit numerical display for displaying the number of copies input from the numerical key 102, and the number of copies that can be set by the numerical key 102 is 1 to 999. If more than 3 digits are input, overflow will occur and only the last 3 digits will be valid no matter how many digits are input. In other words, if "4" is entered after "123", "234" becomes valid and the display becomes "234". When a paper jam (JAM) occurs, the display 131 indicates the position where the paper jam has occurred to alert the operator. It is displayed with 10 strips (J0 to J9), and the paper passage route from the paper jam occurrence location is displayed. For example, when a paper jam occurs in the paper discharge section when the upper cassette is selected, it is displayed as shown in FIG. 4-5, the paper feed check display 127 is also displayed, and the number of sheets display 116 is displayed.
Indicates the number of sheets "P03" that indicates a paper jam in the copying machine and instructs the operator that three sheets are pinched. Further, when a paper jam occurs in the switch back section in the second side of the duplex mode, it is displayed as shown in FIG. 4-6.

Numerical display units such as 116 and 134 of the display unit 101 use a 7-segment display element using liquid crystal, and the details of the 7-segment display unit in the liquid crystal display control unit 201 of FIG.
The control timing is shown in FIG. 7 in FIGS. 4-8 and 4-9.

Q201, Q202, Q203 includes a drive unit that inputs serial display data sent from the main CPU (Q101), performs serial-to-parallel conversion, latches the input data by latch input, and displays 7 segments based on the latched data. This is a liquid crystal driver, and its data storage timing is shown in FIG. "7" in Figs. 4-7 and 4-8
Shows an example of displaying.

FIG. 4-9 is a timing chart showing the data storage timing in the liquid crystal drivers Q201, Q202, Q203, and the drive timing for storing the display data in the driver when the signal is turned on. (1) of the figure shows the drive timing of the display unit 134, and shows an example in which display information is stored in the liquid crystal driver at regular intervals. (2) and (3) show an example in which the display information is stored when the display data is changed and is stored in the liquid crystal driver at a constant period except when the display data is changed. Further, as in (4), the display information may be stored when the display information is changed, and the display information may be stored at irregular timings other than when the display information is changed. Further, (5) shows an example in which display information is irregularly stored in the liquid crystal driver. These timings are used for the display unit 116 of the display unit 101.

Also, although not used in this configuration, the LCD unit is configured to have a display processing function in advance in the latch part and display is performed by the instruction from the one-chip CPU. Is output and the display is constantly refreshed, the same effect can be obtained.

Next, the operation of the serial communication path connecting between the one-chip micro computers will be described. The master of communication is performed by the main CPU (Q101), and the one-chip CPUs of Q102, Q107, and Q108 are slave stations. In other words, the main CPU (Q101) issues a request signal to each slave at regular time intervals as shown in FIG. 12 (B), receives an ACK signal from the other party, and then transmits data to the corresponding slave station. Give and receive. This control in the slave CPU is shown in FIG. 13 (C).

FIG. 8 shows a schematic configuration of the serial communication path. Main CPU
(Q101) and slave CPU (Q102) have 8-bit registers for transmission and reception, respectively.
7) and the sorter CPU (Q108) have one shared 8-bit register. Serial communication path is mainly the main CP
Serial output data TXD-S from U (Q101) and main
CPU (Q101) serial input data RXD-S and main CP
It is composed of the data input / output timing clock SCK-S output from U (Q101). The slave side can accept the data input / output timing clock only when there is a request from the master. Data is not input / output at the same time between and. Data is output in synchronization with the falling edge of the data input / output timing clock SCK-S, and data input is performed at the rising edge of SCK-S. The timing relationship between this serial data and the data input / output timing clock is shown in FIG.

FIGS. 10 (a) to (c) and FIG. 11 (a) show the structure and operation contents of data transmitted and received via the serial data communication path.
~ (C). Figure 10 (a) shows the slave CPU (Q102)
8 bits (b) for serial transfer from the main CPU (Q101)
₀ ~b ₇₎ is from consisting transferred data (SM0～SM7), the upper three bits (b ₅ ~b ₇ out of 8 bits) indicates the type of data, the lower 5 bits (b ₀ ~b ₄₎ operating It shows the contents.
Furthermore the lower 4 bits in the case of SM0 and SM1 the operation content of (b ₀ ~b ₃₎ Figure 10 (b), shown in (c).

FIGS. 11 (a) and 11 (b) show 8-bit data (b ₀ that is serially transferred from the master CPU (Q101) to the slave CPU (Q102).
~ B ₇ ) is a diagram showing the configuration. Of the 8 bits from b _{0 to} b ₇ , the upper 4 bits (b _{4 to} b ₇ ) indicate the type of data, and MS0 to MSF
It is possible to transfer 16 kinds of data shown in (4) and show each operation content shown in the lower 4 bits (b _{0 to} b ₃ ) of the 8 bits.

FIG. 7-1 is a wiring diagram of the key matrix of the operation unit and the switch matrix for adjusting a serviceman installed inside the main body. In the figure, "0" to "9" are keys in FIG. 102, and 103 to 115 correspond to the keys in FIG. Also the 7th
-1 The right side of FIG. 1 shows the key matrix for the micro switch and the service person switching switch of each sensor section. EX2P40 to EX2P63 are selection signals output from the main CPU (Q101). PD0 to 3 are the main CPU (Q10
It is a digital signal output from 1) and PD0 at 2mSEC intervals.
Are sequentially output. This output timing is shown in FIG. 7-2. This digit signal is also used for the dynamic display of the LED array (blank exposure) for the eraser on the drum surface. This circuit diagram is shown in Fig. 7-3 (a). The blank exposure is used to cut the outside of the image area and the blank area depending on the paper size and the magnification when the LED array is turned on by the eraser on the drum surface when the paper is being copied or when the paper is idled. Also used.

LEDs 1 to 28 are lighted to the sheer cut according to the paper size by dynamic lighting. The positional relationship between the eraser LED and the drum is shown in FIG. 7-3 (b). The LED array is configured to be controlled by one digit signal in units of 7 segments, which is performed by the above-mentioned digit signals PD0 to PD3. Selection signal PF0 output from main CPU (Q101)
~ Displayed in combination with PF6. Figure 7-4 shows the number of lit cut cuts according to the magnification for A4 landscape paper size. In other words, at 100% (actual size), only LED1 is turned on,
After that, I will turn on one LED each time it decreases by 2%. The figure shows an example corresponding to 46%.

Next, the copying operation will be described. The reference of the operation is the drum clock (238) generated by the drum rotating in synchronization with the main motor, and the slave CPU (Q102) counts the drum clock and uses it for various sequence control described later. In addition, the slave CPU (Q102) also counts encoder pulses (239) from the optical system motor,
Used to control the position of the optical system.

When the main motor is driven, the driving is started at a low speed at high speed and medium speed, and then the speed is switched to a predetermined speed. This is protection against the thermistor attached to the rollers of the fuser. In other words, this is to prevent impact.

The control of the embodiment will be described below with reference to FIGS. 12 (A) to (I) and FIGS. 13 (A) to (r).

As shown in FIG. 12 (A), the main CPU (Q101) resets the RAM and input / output ports (Q103 to Q106) at steps 1201 to 1203 when the power is turned on or reset, and performs the initial processing to start the internal timer. Then, data is input from the input port or the like (step 1204), key input processing is performed (step 1205), and then zoom lens movement processing shown in FIG. 12 (G) is performed (step 1206). The details of this zoom lens movement processing will be described later with reference to FIG. 5-4. In step 1207, the intermediate tray moving process shown in FIG. 12 (H) is performed. Details of this processing will be described later with reference to FIG. 6-2. Then, the display processing of the display section is performed (step 12
08), the monitoring program processing shown in FIG. 12 (D) is performed (step 1209). Normally, this step 1209 is looped from step 1204, and necessary processing is sequentially performed. In addition, there is timer interrupt processing for every 2 mSEC by the internal timer shown in FIG. 12 (B), and time management is performed.

When serial data is received from another CPU, a serial receive interrupt occurs as shown in Fig. 12 (C),
The reception data is stored.

In the monitoring program shown in FIG. 12D, the states of the respective parts of the copying machine are sequentially checked as shown.

FIG. 12 (E) shows details of the sequence check of FIG. 12 (D). In this sequence check, the status is "0" at the beginning, and the value of the status is changed according to the end of the processing, and the corresponding processing is performed. Before the power of the copying machine is turned on, the status is "0" and the power-on waiting process of step 1232 is performed. When all the power is turned on, the status becomes 1 and the heater of the fuser of step 1234. Turn on to start the temperature control process and then set the status to "2".

Next is the fixing device 170 ° C waiting process (step 1236). The details are shown in FIG. 12 (F). When the temperature of the fixing device is 170 ° C. or lower (step 1245-N), the latest fixing device temperature is displayed on the display unit at regular intervals as shown in FIG. 4-9 (1) (step 1247). When the temperature of the fixing device reaches 170 ° C. or higher (step 1245-Y), the display on the display unit is changed from the fixing device temperature to the copy magnification display and the status is set to "3" (step 1246). When the status becomes "3", wait for the copy key push button (step 1238). When the push button is pressed, the status is set to "4" for single-sided copy processing (step 1240), and for double-sided copy, first The status is set to "5", the copy processing for the first side is performed (step 1242), the status is set to "6", the copy processing for the second side is performed (step 1244), the status is set to "3", and the copy key waiting processing is performed again. Run.

Next, an outline of control of the slave CPU (Q102) will be described. As shown in FIG. 13 (A), the slave CPU (Q102) initializes the RAM and I / O ports as in the main CPU (Q101) as the initial processing (steps 1301 and 1302) and resets the internal timer (steps). 1303), followed by port input to input the state of the control portion (step 1305). Subsequently, if necessary, optical system return control (step 1306) and switch back control (step 1307) are performed, and after power supply check (step 1308) is executed, sequence control (step 13) is performed.
09) and usually loop 1309 from this step 1305.

In addition, there are interrupt processes shown in FIGS. 13 (B) to 13 (F).

FIG. 13 (B) is an internal timer interrupt that occurs once in 2 mSEC and is used for time management. FIG. 13 (C) is generated when serial data is received from the main CPU (Q101) described above, and the contents of the receive register containing the receive data from the main CPU (Q101) are loaded to the slave. The response according to the state of the PCU (Q102) is stored in the transmission register and the data is transmitted. FIG. 13D is an interrupt generated when the optical system for scanning the original is driven, and its description will be given later. FIG. 13 (E) is an interrupt by the drum clock (238) generated by the drum that rotates in synchronization with the main motor. The drum counter, which is the reference for the copying operation, is incremented by 1 (step 1341), and the drum count corresponding to the value of the drum counter. The table is searched (step 1342), the necessary table is counted up (step 1343), and if the count specified in the table is completed (step 1344-Y), the corresponding processing is performed (step 1345). If not finished, the drum clock interrupt process is finished as it is. FIG. 13 (F) is an optical system clock interrupt process, which is generated by an encoder pulse (239) generated by an encoder driven in synchronization with the rotation of the optical motor. This process will be described later.

The above is the interrupt processing.

Sequence control shown in FIG. 13 (A) (step 130
As with the main CPU (Q101), 9) performs various controls according to the value of the forward status from the time of power-on, and as shown in FIG. Step 1378 STS7 from STS0 processing
It is divided into eight sequences of processing.

The control will be described below according to the status.

(1) Operation at power-on The following is a description with reference to the timing chart of the initial operation at power-on in FIG. 14-1.

In the initial state, the status is set to "0", and the processing advances to step 1371. In step 1371, the status is "0" until the power is turned on, as shown in FIG. 13 (H), but when the main switch is turned on and the power is turned on, the fuser heater is turned on and the status is set to "10". When the status becomes "10" 4, the upper 4 bits become 1 (hexadecimal) and the program proceeds to step 1372, and as shown in FIG. 13 (I), the lower 4 bits of the status divides from step 1380 to step 1382, and FIG. 13 (J). ，
The process shown in (K) is executed.

If the status is “10”, go to step 1380 and wait for the fuser thermistor 210 to reach 170 ° C. (step 139
1). The main CPU also performs 170 ° C wait processing as shown in Fig. 12 (F). After that, when the fixing device thermistor 210 reaches 170 ° C., the main motor is rotated at a low speed (step 1392), the developing bias is turned on (step 1393), and all the blank LEDs for the drum surface eraser are turned on to perform the drum surface erase ( Step 1394) and set the status to "11". When the status becomes "11", the operation proceeds to step 1381 and waits for the drum clock to reach 50 pulses as shown in FIG. 13 (K), and when it reaches 50 pulses, the status becomes "12". This is because When the status becomes "12", the operation proceeds to step 1382, where the temperature of the fixing device is 180
Wait for it to reach ℃.

When the fixing device thermistor 210 reaches 180 ° C., the main motor is once turned off, the optical system is controlled to the home position, and the status is set to “20”. When the status becomes “20”, step 13
Proceed to step 73 and proceed from step 1401 to 1406 depending on the value of the lower 4 bits.
Divided into Here, the lower 4 bits are "0", and the process proceeds to step 1401 shown in FIG. In step 1401, the main motor is switched to high-speed rotation, the control rotation for measuring the drum surface potential is entered, the fuser heater is turned off, and the fuser temperature is prevented from rising above 180 ° C (afterward, the fuser temperature is 180 ° C. Is adjusted to.) And the status is "21"
Then, the processing in step 1401 is ended.

When the status becomes "21", the process proceeds to step 1402 shown in FIG. 13 (N). In step 1402, when the drum clock reaches 193 as the first step of control rotation, the dark area potential of the drum surface is measured by the potential sensor close to the drum surface to the main CPU.
The drum surface potential 208 is taken into the A / D input of (Q101) and measured, and the result is fed back to the current value of the charging high voltage so that the dark portion of the drum is controlled to have an appropriate potential.
The measurement timings are indicated by D1 to D4 in FIG. 14-1 and are measured four times in total. Then the drum clock is cleared and the status is set to "22".

When the status becomes “22”, the process proceeds to step 1403 shown in FIG. 13 (O). If the lens is not moving, the halogen lamp 21 is turned on, and when the optical system is at the home position, the white of the document table edge is displayed. The board is illuminated, the drum clock is cleared, the status is set to "23", and the processing of step 1403 is completed.

When the status becomes “23”, the process proceeds to step 1404 shown in FIG. 13 (P), the potential of the light portion of the drum is measured by the potential sensor, and the lighting voltage of the halogen lamp 21 is fed back to the lighting voltage via the halogen voltage control 204. To do. L1 in Figure 14-1
~ L3 indicates the measurement timing, and the measurement is performed three times in total.
When the above measurement is completed, clear the drum clock,
The status is set to "24" and the processing of step 1404 is completed.

When the status becomes "24", the operation proceeds to step 1405 shown in Fig. 13 (Q), the registration clutch is turned off, the rotation of the drum is stopped, the halogen lamp is turned off, the drum clock is cleared, the status is set to "25" and the processing is ended. To do.

When the status becomes "25", the process proceeds to step 1406 and waits until the drum clock becomes 193. Then, the blank LED and the main motor are stopped and the status becomes "30".

This status is a self-check sequence from "0" to "25" until the copy is ready after the power is turned on. The status 30 is waiting for the copy key push button.

When the status becomes "30", the process proceeds to step 1374 shown in FIG. 13 (S) and waits for the copy key push button. When the copy key is pressed, the status is set to "40" and 2 from the previous copy.
If more than one hour has passed or the copy magnification is different, set ZONE to A.
Set ZONE to B if less than 2 hours and 2 minutes have passed from the previous copy, and set ZONE to C if less than 2 minutes.

(2) Operation of copy preprocessing Fig. 14-2 shows the timing chart.

When the copy key 106 is pressed, the status becomes "40" and the process proceeds to step 1375 shown in FIG. Step 1375
Then, check the lower 4 bits of the status, from step 1411.
Divide into 1416.

Since the status is "40" and the lower 4 bits are "0", the operation proceeds to step 1411 shown in Fig. 13 (U) to rotate the main motor at a low speed to turn on the high voltage output (233) and turn on the registration clutch. Blank LED with rotating drum
All lights up, the drum clock is cleared, the drum count is prepared, the status is set to "41", and the process ends.

In double-sided copy mode, if the magnification is 90% or less, turn on the pedestal transport motor at medium speed.

When the status becomes "41", the lower 4 bits become "1", and the flow advances to step 1412 shown in FIG. 13 (V). Step
In the 1412, after the low-speed main motor rotates for 30 pulses, when the magnification is 90% to 144%, it is rotated at high speed, and when it is less than 90%, it is rotated at medium speed, the developing bias is turned on, and the drum clock is turned on. Clear to end processing and set status to "4
To 2 ".

When the status becomes "42", the process proceeds to step 1413 shown in FIG. 13 (W). In step 1413, the main motor is rotated by 193 pulses and then the blank LED is turned off.
If ZONE is set to C in 4, the status is "43".
When ZONE is other than C, the status is set to "50" in the AE mode, the status is set to "44" in the AE mode, the drum clock is cleared, and the processing is ended. This is to change the number of times the drum potential is adjusted depending on the copy interval from the previous time.

If the time from the previous copy is 2 minutes or more and ZONE is other than C, the status is "43", and the routine proceeds to step 1414 shown in FIG. 13 (X). In step 1414, after rotating the main motor by 69 pulses, the drum surface potential is measured 4 times if the time interval from the previous time is 2 hours or more and 2 times within 2 hours and the status is set to "44". Then, the process ends.

When the time interval from the previous copying is within 2 minutes and after the processing of step 1414 is completed, the status is "44", and the processing proceeds to step 1415 processing shown in FIG. 13 (Y). In step 1415, the halogen lamp 21 is turned on, the drum clock is cleared, the status is set to "45", and the processing is ended. The halogen lamp is turned on for the same purpose as the step 1403 treatment.

When the status becomes “45”, the process proceeds to step 1416 shown in FIG. 13 (Z), and after rotating the main motor by 115 pulses of the drum clock, the light potential of the drum surface is once when ZONE is A and twice otherwise. After the measurement, if the AE mode is set, the status is set to "50" and the AE mode process is performed. If the AE mode is not set, the status is set to "60" and the transfer paper feeding process is performed.

In the AE mode, the status is set to "50" and the process proceeds to step 1376 shown in FIG. 13 (a), where it is divided from step 1421 to 1425 according to the value of the lower 4 bits.

In AE mode, the density of the original is measured and the density is automatically adjusted. With this mode, you can always make clean copies without fog. First, with the status "50", the step 1421 processing shown in FIG. 13 (b) is executed to advance the optical system to the status "51". This is because in order to measure the density of the copy original, the optical system is emptied before the copying to measure.

When the status becomes "51", the process proceeds to step 1422 shown in Fig. 13 (c), waits until the optical system advances to 1/2 position of A4 size, turns on the halogen lamp, and sets the status to "52". The process ends.

When the status becomes "52", the process proceeds to step 1423 shown in Fig. 13 (d), and when the AE measurement is started, the main CPU (Q101)
AE measurement is requested, and the optical system (not shown) is moved backward, and then the status is set to "53" and the processing is ended.

The main CPU (Q101) jointly performs AE measurement in response to the request from the slave CPU (Q102). The sensor for measurement may be an optical sensor installed on the optical path or a sensor for measuring the surface potential on the surface of the photosensitive drum. Also, in Fig. 14-2, the measurement is made when the optical system is moving backward, but this is a halogen lamp.
Since the lighting start-up time of 21 is covered while the optical system is moving forward, the time for the first copy is shortened as much as possible. However, with this machine, AE measurement is possible while the optical system is moving forward by switching the service person.

The result of AE measurement is fed back to the halogen lamp 21, and the lighting voltage of the halogen lamp is controlled by the main CPU (Q101).

When the status becomes "53", the program proceeds to step 1424 shown in FIG. 13 (e) and waits for the end of the above AE measurement. When the AE measurement is completed, the information is sent to the master {main CPU (Q101)} and the status is set to "54".

When the status becomes "54", the process proceeds to step 1425 shown in FIG. 13 (f), waits for the optical system to return to the home position, sets the status to "60", and terminates the processing.

After that, Sukiyan for copying is performed. At this time, in order for the optical system to move forward, the scanning is started after confirming the paper feed completion flag. The paper feed completion flag will be described later.

(3) Single-sided copy mode processing When the pre-copy processing is completed, the status changes to "60" and the 13th
Proceed to step 1377 shown in FIG. Here, first, an intermediate tray paper feeding sequence process is performed (step 1430), and then, in step 1431, a deck paper feeding sequence process is performed.
Details of this processing will be described later.

Next, the main body re-feeding process is performed (step 1432), and the process is divided into steps 1434 to 1440 depending on the value of the lower 4 bits of the status.

Steps 1430 to 1432 make a copy operation and make it possible to execute the next copy operation before the sheet is completely ejected, so that the paper conveyance control is always performed in parallel with the processing indicated by the lower 4 bits of the status. Always running on 1377.

Initially, the status is "60", and the flow advances to step 1434 shown in FIG. 13 (h). In the case of the double-sided copy mode, the intermediate trace attack back processing described later is performed. In the case of the single-sided copy, the status is set to "61" and no actual processing is performed.

At the time of one-sided copying, the status is immediately set to "61", and the process proceeds to step 1435 shown in FIG. 13 (i).

In step 1435, wait for the completion of the paper feeding in the paper feeding sequence processing of step 1431, move the optical system to the home position after the paper feeding is completed, start the copy sequence, turn on the developing bias, and clean the fixing device. After calculating the scanning width to scan the optical system according to the copy magnification,
The LED is turned off, the optical system is scanned corresponding to the original, and an image is formed on the drum. Then, the status is set to "62" and the processing is ended.

When the status becomes "62", the process proceeds to step 1436 shown in FIG. 13 (j), the copy number is decremented by -1, the final copy flag is set only when the final copy is made, and then the status is set to "63" and the processing is terminated. To do.

When the status becomes “63”, the process proceeds to step 1437 shown in FIG. 13 (k) and waits until the scanning of the optical system is completed, and when the scanning is completed, the blank LED is turned on to prevent imaging of an extra portion, The drum clock is cleared, the status is set to "64", and the processing ends.

When the status becomes "64", the operation proceeds to step 1438 shown in Fig. 13 (l) and the main motor is driven by the drum clock pulse 10
After rotating for a pulse, the halogen lamp is turned off, the status is set to "65", and the processing ends.

When the status becomes "65", the process proceeds to step 1439 shown in FIG. 13 (m). If the final copy flag set in step 1436 is set here, the optical system is moved backward at a low speed and the status is processed as "70". To finish. If it is not the final copy, it is necessary to perform the above control again, so
When the optical system returns by half of A4 size, the halogen lamp is turned on again and the status is set to "66" in preparation for the next copy operation.

When the status becomes "66", the procedure proceeds to step 1440 shown in FIG. 13 (n), waits for the optical system to return to the home position, and when the status returns to the home position, the status is set to "61" and the state shown in FIG. Processing is performed from step 1435 shown in i).

When the copy is completed up to the final number, the status becomes "70" and the process proceeds to step 1378 shown in FIG. 13 (o).

In step 1378, the processing of steps 1451 to 1453 is divided according to the value of the lower 4 bits of the status.

At the beginning, the lower 4 bits of the status is "0", and the flow advances to step 1451 shown in FIG. 13 (p). In step 1451, the developing bias is turned off after waiting for the main motor to rotate by 26 pulses of the drum clock, after which the drum clock is cleared and the status is set to "71" to end the processing.

When the status becomes "71", the operation proceeds to step 1452 shown in Fig. 13 (q), waits for the main motor to rotate 96 pulses of the drum clock, turns off the high voltage control, clears the drum clock, and then sets the status to "72". Ends the process.

When the status becomes "72", the process proceeds to step 1453 shown in FIG. 13 (r), waits for the main motor to rotate the drum clock 193 pulses, and then waits until the paper discharge is not completed, then turns off the main motor. At the same time, the pedestal transfer motor is turned off and the status is set to "30"
To complete the copy operation.

The status "30" indicates step 1374 shown in Fig. 13 (S).
The process is waiting for the next copy key push button.

(4) Duplex copy (AE) mode Figure 14-3 shows the timing chart.

The front-side copy is almost the same as the single-sided copy, but the copy paper needs to be stored in the intermediate tray 47 below without being ejected from the main body 100. Therefore, the step shown in FIG.
In 1434, the pedestal transfer motor is turned on,
The switch back flapper 31 in FIG. 4 is raised to raise the intermediate tray feeding roller. After that, the status becomes "61" and the procedure goes to step 1435 to perform the same processing as the one-sided copy mode.

The back side copy is sent from the intermediate tray by the paper feed stepping motor, and by turning on the transport clutch,
It is sent to the main body registration roller. Then, when the paper feed completion flag is set, the optical system advances to copy.

The copying process is the same as the one-sided copying except that the paper feeding process is partly different.

When the sorter 400 is connected, the copied paper is
The copy paper is reversed and ejected at the switch back section. In the enlarged view of the switchback section in FIG. 14-4, the copy paper flows downward by raising the flapper 31 and the switchback sensor 1 at 34 detects the leading edge of the paper, and the switchback sensor 2 at 35 detects the paper edge. When the sensor 1 of 34 detects the trailing edge after the leading edge is detected, the switch back solenoid 33-3 is turned on, and the copy sheet is reversed and advances. When the sensor 2 at 35 detects the trailing edge of the paper, the solenoid at 33-3 is turned off. The paper is guided as it is to the outlet side and is output to the outside of the machine with its front and back reversed. The 32 guide plates are pushed toward the arrow side, and the paper flows from above while smoothly pushing the guide plates, and when reversing, advances to the leftward path.

Next, the control of the optical system including the halogen lamp 21, the first scanning mirror 22 and the like will be described.

The optical system is directly driven by the DC motor 15-1 through the wire 15-3 as shown in the plan view of FIG. 15-1.

A clock pulse corresponding to the moving distance is generated by the encoder 15-2 attached to the DC motor. A signal is output when a flag plate 15-7 attached to the mirror base crosses a fixed sensor described later. One of these sensors is an optical system home position detection sensor 15-5 that detects the home position of the optical system, and the other is an image leading edge detection sensor 15-6 that means the leading edge of the document. Reference numeral 15-4 is a pulley.

When moving forward, the slave CPU (Q10
It is controlled by the PLL control described later by 2). The forward distance is determined by counting the optical system clock pulse from the image front edge detection sensor 15-3 and determining the magnification and the transfer paper size. The relationship between this magnification, the optical system clock pulse, and the transfer paper size is shown in FIG. 15-2. The calculation formula is Y clock =
It is {(L / M) +5} ÷ 0.88. L is the feed length (mm) of the transfer paper, and M is the magnification (100% = 1,50% = 0.5,120% =
1.2) The constant "5" (mm) indicates the slit width of the optical system,
That means that you can skim extra. "0.88"
Indicates that this embodiment has a configuration of moving 0.88 mm per clock. The maximum size of the manuscript is A3,
The maximum Sukiyan clock is up to 100% A3 size.

When traveling in reverse, the vehicle travels backward at a constant speed 2.5 times that of forward traveling in the same size.
When moving backward, the clock pulse is subtracted, and the position of the optical system is confirmed in the same way as when moving forward. In order to keep the stop position constant when moving backward, the brake is applied from before the optical system home position to decelerate, and control is performed so as to stop within a certain range. In the present embodiment, the backward movement is turned off by the sense signal of the image front end detection sensor 15-6, and the optical system home position detection sensor 15-
Brake control is performed up to 5. During this period, it is 55 mm, and there are 32 optical system clock pulses. This is divided into 7 times, and brake control is performed once every 4 pulses, and a total of 7 times are performed. This timing is shown in FIG. 15-3, and the control flow chart is shown in FIG. 15-4.

This control method is a method of inputting an optical system forward signal according to the speed to decelerate the optical system. In Fig. 15-3, 4
The velocity is known by measuring the time tn for moving the pulse. Based on this speed, the braking time (forward-on time) of Xn (mSEC) is determined from the present time. However, when the number of samplings is n, the inertial force is also reduced, so it is necessary to correct the braking time. Therefore, the braking time Xn (mS
EC) = 2 {K- (t / 2) -n}. Here, K is a constant depending on the characteristics of the motor. In the present embodiment, this constant can be variably set by a volume or a display switch, and a stable stop position can always be obtained by changing the constant even at the time of factory shipment or when a service engineer replaces a motor with greatly different characteristics. . Table 2 is a table showing the value of Xn when the constant K = 10. When the calculation result has a negative value only for the first and second sampling times, the home position is not reached by inertia alone because the speed is slow, so the reverse signal is turned on again. After the third time, when the calculation result is 0 or less, the brake is not turned on.

The brake control program shown in the flow chart of FIG. 15-4 is in the "optical system clock interrupt processing" shown in FIG. 13 (F). That is, this is a process executed once for each encoder pulse of the optical system motor.

The brake flag here is a flag which is set when the reverse signal is turned off when the interrupt of the image leading edge signal is input during the reverse drive in the "image front interrupt" (step 1330) shown in FIG. 13 (D). The brake control program is executed only when this brake flag is set.

To execute the brake control program means that the encoder pulse has come once, so the value of "pulse" is incremented by 1 in step B-2. Then, when the pulse has been received three times in total, step B-3-YES is selected and the process proceeds to step B-4. In step B-4, the "pulse" is cleared, and in preparation for the next sampling, in step B-5, the value of t is incremented every 2 mSEC in the "timer interrupt processing" shown in Fig. 13 (B).
1 and the value of t is read. At step B-6, the value of the constant K of the volume or the depth switch described above is obtained. Then, in step B-7, the sampling number n
Is incremented by 1 and based on these data, calculation is performed based on the above-mentioned calculation formula in step B-8. Then step B-9
Then, t for speed detection is cleared, and in step B-10, check whether the calculation result is 0 or less. If it is larger than 0, the forward brake is turned on in step B-11, and step B-12.
Now set the timer value so that the brake is turned off after Xn (SEC). If the calculation result is 0 in step B-13, nothing is done. If the calculation result is negative in step B-14 and the number of samplings is within the second, step B-15 is used to move backwards | X.
Turns on for n | mSEC. Step B-17 is 7 at the END check
When the operation is completed, the brake flag is reset and the brake control program is completed.

An example of this control result is shown in Figure 15-5.

D indicates that the forward signal is output by 7 pulses in the normal control. E is a control result when the speed is faster than usual at the image tip, and shows that the braking time is overlapped until n = 4, and as a result, the forward signal is continuously input. Since F is slower than usual at the image destination, n = 1
And 2 indicate that reverse is on.

By controlling in this way, the copier can sufficiently cope with changes in speed and changes in inertial force due to changes in the load of the optical system due to changes over time.

Next, the PLL control will be described in detail.

FIG. 16-1 is a block diagram of the PLL control unit.
Is a crystal oscillator for generating a reference frequency for PLL control, 702 is a frequency divider that divides the crystal oscillator to create a reference clock to create a reference frequency fs, and Q102 is a slave for controlling control CPU, 704 is a driver for driving the motor, 705 is a motor controlled at a constant speed, and 706 is an optical rotary encoder for sensing the speed of the motor. 707 is a frequency divider that converts the encoder output to a desired frequency fs.

Figure 16-2 is a block diagram of the slave CPU (Q102).

The slave CPU (Q102) has two timers of 720,721 and a timer event counter of 722. fs counter 70
8 uses timer 721, FV counter 709 uses timer event counter, and PC counter uses timer 721.
Is used.

16-1 phase comparison 710, pulse width conversion calculation 712,714,
Addition 715 is to be processed programmatically and is a slave CPU
(Q102) does not have it as a function.

This configuration is the same for the main CPU (Q101).

FIG. 16-3 is the PLL control flow chart described above.

Next, the operation of the above structure will be described in order based on FIGS. 16-3 (a) to 16 (d).

In FIG. 16-3 (a), 731 externally inputs a set value through the port of the slave CPU (Q102), and 732 sets a count value corresponding to the set value in the f _S counter 708,
Start counting. Also, 733 sets a count value (normally 1/2 of f _S ) corresponding to the set value in the f _V counter 709.
In the f _S interrupt program in Fig. 16-3, the f _S counter
When the count end interrupt is input from 708 (741), if f _G input is not input to the f _S count value even once by the determination of 742, the PC is set (743). Here PC is the result of the comparison of f _G and f _{S in} the 710 phase comparison. If there is f _G input, and if f _G input is once according to the judgment of 745, the PC is set (746) and the PC count 713 is started (74
7). If NO in the judgment of 745, that is, if the f _G input is more than twice, the PC is reset (748). In FIG. 16-3 (d) f _G interrupt program, when the f _G interrupt input of 751 is present, first the FV output is reset at 752 and the FV counter 709 starts counting. Next, according to the judgment of 753, the PC is reset when the f _S input is not required even once (758). 754 in f _S
When the input is input once, the PC is reset (756) and the PC counter is terminated (757). If NO in the judgment of 754, that is, if there are two or more times, the PC is set (759).

When the count end interrupt of the FV counter 709 in the 760 in the FV interrupt program of FIG. 16-3 occurs (761),
Set the FV (762). In order to convert the PC count value and the FV count set value obtained here into PWM signals, pulse width conversion operations of 714 and 712 are performed, and one PWM signal is obtained by the addition operation of 715. The PWM signal is input to the driver 704 to directly drive the motor and control the motor at a speed matching the set value.

With the configuration of the above embodiment, the DC motor can be easily controlled to a constant speed according to the set value regardless of the characteristics of the low pass filter of the PLL, and the external peripheral circuits can be extremely reduced by the introduction of the microcomputer.

Next, the paper feed control will be described.

Figure 17-2 shows two stepping motors used for paper feed control.
It shows an example of a circuit driven by a phase excitation method. For the coils A, B of the stepping motor 17-101, a buffer driver 17-102 and an inverter driver 17-103 are provided.
Causes a voltage corresponding to the output state of the slave CPU (Q102) to be applied. 17-104 is a relay, slave CPU
DC to the motor by the signal O5-3 from (Q102)
Power can be turned on / off. This is to make the paper feed roller free (move freely) after a predetermined pulse. FIG. 17-1 shows signals output from the slave CPU (Q102). O5-1 and O5-2 are pulse signals of A and B, respectively, and the first 20 pulses are 200pps (1 pulse 5mSE
C), then 100 pulses after 500pps (1 pulse 2m
SEC) to output.

Figure 17-3 shows the slave CPU (Q10
It is a flow chart of the program stored in 2). This program is processed in the timer process of FIG. 13 (B) in which an interrupt occurs at regular intervals.

First, check whether the "switch" for inverting which of the A and B signals is 0 or 1 (step 17-01), and then invert each signal (step 17-02, 17-0).
3). Then reverse the "switch" (0 → 1 or 1 → 0)
(Step 17-04) Step 17 at the next timing
Make -01 branch opposite. Then, the oscillated pulse is incremented by 1 (step 17-05), and it is checked whether 120 pulses have been completed (step 17-06). When completed, step 17-10 turns on the relay 17-104 in Fig. 17-2. Turn off and stop power supply. Then, in step 17-11, the paper feeding completion flag for informing that the paper feeding is completed is set and the processing is ended.

Step 17-07 is to check if it is within the first 20 pulses, and if it is within 20 pulses, 5m at step 17-08.
Set the SEC timer, step 20 if more than 20 pulses
Set the 2mSEC timer with 7-09. When this timer is completed, the paper feed control program is executed again.

Fig. 17-3 shows the flow chart when the copy paper is in the standard cassette, and when supplying copy paper from other paper cassettes, it suffices to change the number of drive pulses described above. Is set.

FIG. 5-1 shows a driving portion of the zoom lens.

A lens support base 506 to which the zoom lens 20 is attached has a stepping motor 501 mounted on a shaft via a wire 503, pulleys 504 and 502. By rotating the stepping motor 501 forward and backward, the lens 20 can be moved and the focus can be adjusted (the configuration is omitted in this drawing).

FIG. 5-2 shows an example of a circuit for driving the stepping motor 501 by a two-phase excitation method. The buffer driver 50 is installed in the coils A, B of the stepping motor 501.
7. The inverter driver 508 applies a voltage according to the output state of the input / output port Q103. That is, the lens 20 moves forward when the pulses shown in FIG. 5-3 (a) are applied, and moves backward when the pulses are applied in the order shown in FIG. 5-3 (b).

In the apparatus shown in FIG. 5A, the pulse width is shortened when the stepping motor 501 is started and is gradually increased when the stepping motor 501 is stopped, as shown in FIG. Method.

Further, in the apparatus shown in FIG. 5A, the lens 20 is always stopped from the fixed direction to the target position in order to improve the accuracy of the stop position.

FIG. 5-4 shows details of the flow chart for moving the lens to the target position in the zoom lens moving sequence of FIG. 12 (G). When a lens movement request is issued, it is determined in step 5-4-1 whether or not initialization has been performed in the home position. If the initial settings are being made, proceed to step 5-4-4. When the initial setting is not performed, the process proceeds to step 5-4-2, the pulse motor 501 is moved backward, and the lens indicator 506 moves until it reaches the home sensor 505 using the photo interrupter. Next, in step 5-4-3, it is set that the lens is in the home position after the initialization. Step 5-
In 4-4, the relationship between the current position of the lens and the movement target position is determined. If the lens moves backward, go to step 5-4-9. When the lens advances, the process proceeds to step 5-4-6, and the output port of the I / O port Q103 is output so that the lens advances by one step in the forward direction. Next, in step 5-4-6, it is determined whether the lens has moved to the target position. If you are not at your destination yet,
It returns to step 5-4-5 again, and further advances to the target position. When the target position is reached, step 5-4-
In step 7, the lens movement completion is set, and the lens movement processing is ended.

In the backward processing, the ports A and B of the I / O port Q103 are output so that the lens moves backward, and the lens moves backward by one step and advances to step 5-4-10. Also moves to the home sensor side). If you have not reached the target position + α, 5-
Return to 4-9 and continue the reverse. When the lens has advanced to the target position + α, the process proceeds to step 5-4-5, where the lens forward processing is executed from step 5-4-5, and when the lens advances to the target position, the lens movement completion is set and the backward processing is performed. finish.

In this way, the lens 20 is always moved from the fixed direction (forward direction) to the target position, so that very good stop position accuracy is obtained.

In the intermediate tray that uses this lens movement control method for double-sided copying, the same control is performed even when the paper retainer that stores the copy paper is moved to match the paper size (described above), resulting in a very good stop position. Accuracy can be obtained.

The operation will be described below.

FIG. 6-1 is a schematic diagram showing the structure of the paper size control plate of the intermediate tray. The control plates 49 and 605 are plates that move according to the size of copy paper. The control plate is moved by a stepping motor 602 via a wire 603 and a pulley 601.

FIG. 6-2 is a flow chart showing details of the X-axis and Y-axis movement control flow of the paper size control plate of the intermediate tray shown in FIGS. 12 (H) and 12 (I). When an intermediate tray movement request is issued, in step 6-2-1, a pulse is applied to the stepping motor 602a until the control plate on the X-axis side crosses the home sensor 604a.

When the X-axis control plate reaches the home position, the process proceeds to step 6-2-2, and the Y-axis control plate similarly applies a pulse to the stepping motor 602b until it crosses the home sensor 604b to move it to the home position position. Next, in step 6-2-3, the amount of movement from the home position is obtained from the size of the copy sheet, and the process proceeds to step 6-2-4. Step 6-
In 2-4, the Y-axis control plate judges whether or not it has moved to the target position, and when it has not reached the target position, it proceeds to 6-2-5 and outputs one stepping motor drive pulse on the Y-axis side. Go back to 6-2-4 and move to the target position. When the Y-axis control plate reaches the target position, the process proceeds to step 6-2-6, and similarly the steps 6-2-7 and 6-2-8 move the X-axis control plate to the target position, and then step 6 2-9, the completion of movement of the intermediate tray paper size control plate is set, and the processing is ended.

FIG. 6-3 shows the flow of the intermediate tray X-axis control plate up of the intermediate tray paper feeding sequence process shown in FIG. 13 (g). The process shown here is to move the copy sheets stored in the intermediate tray to the refeed position. When a request for X-axis control plate up is generated, in step 6-3-1, the movement amount of the X-axis control plate is converted into the number of pulses, and the process proceeds to step 6-3-2 to move the X-axis control plate to the target position. Check if it has been reached, and if not, step 6-3-
Go to 3 and set the stepping motor drive pulse on the X-axis side to 1
And then return to step 6-3-2 to proceed to the target position. When the target position is reached, the process proceeds to step 6-3-4, the intermediate tray control plate up completion flag is set, and the process ends.

Although not described in FIGS. 6-2 and 6-3, in order to prevent the stepping motor from being out of order and starting failure, the fifth step is used.
As in the case of FIG. 3C, the drive pulse is applied through through up and down.

Effect As described above, according to the present invention, when it is detected that the reciprocating member has reached the predetermined position near the stop target position, in each section from the predetermined position near the stop target position to the stop target position. The speed of the reciprocating member is detected, and the driving force for moving the reciprocating member in the forward direction or the driving force for moving the reciprocating member in the backward direction is determined according to the speed detected in each section. When each speed is applied in the next section and the speed of the reciprocating member in each section is faster than the predetermined speed in each section, the driving force for moving the reciprocating member in the responsive direction is detected in each section. When the speed of the reciprocating member in each section is slower than the predetermined speed in each section, the driving force for moving the reciprocating member in the backward direction is given. Power is applied in the next section for each time corresponding to the speed detected in each section, so that the reciprocating member can be smoothly and quickly stopped at the target stop position even if the friction changes due to surrounding environmental conditions. Further, it is possible to prevent the reciprocating member from stopping before the stop target position due to friction.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a copying machine according to an embodiment of the present invention, FIG. 2 is a block diagram of a control system, FIG. 3 is a front view of a display unit, and FIGS. 4-1 to 4-6 are displays. Fig. 4-7 shows a display unit numerical display drive circuit diagram, Fig. 4-8 and Fig. 4-9 show display unit display timing chart, and Fig. 5-1 shows optical lens drive. FIG. 5-2 is an optical lens drive unit drive motor drive circuit diagram, FIG. 5-3 (a) to (c) are optical lens drive timing charts, and FIG. 5-4 is optical lens drive control. Flow chart, FIG. 6-1 is a schematic diagram showing the structure of the intermediate tray paper size control plate, FIG. 6-2 is a control flow chart of the intermediate tray paper size control plate, and FIG. 6-3 is an intermediate tray X. Axis control plate up control flow chart, Fig. 7-1 shows keymatrix circuit diagram, FIG. 7-2 is a digit signal timing chart, FIG. 7-3 (a) is an LED array drive circuit diagram for the drum eraser, and FIG. 7-3 (b) is a positional relationship between the drum eraser LED array and the drum. Fig. 7-4 is a diagram showing the number of lights of the sharp cuts with respect to the magnification when the LED array A4 for drum eraser is laterally fed. Fig. 8 is a block diagram of the serial communication line between CPUs. Fig. 9 is a CPU serial communication line. Data input / output timing chart, FIGS. 10 (a) to 10 (c) show the status of the slave CPU to the main CPU, and FIGS. 11 (a) to 11 (c) show the status of the main CPU to the slave CPU, 12 (A) to (I) are main CPU outline control flow charts, and FIGS. 13 (A) to (Z) and (a) to (r) are slave CPUs.
Overview Control flow chart, Figure 14-1 is the control timing chart when the power is turned on, Figure 14-2 is the control timing chart during normal copying, and Figure 14-3 is the control timing chart during double-sided copying. FIG. 4 is an enlarged view of the switch back section, FIG. 15-1 is a schematic view of the configuration of an optical system control unit including a light source, and FIG. 15-2 is a view showing the relationship between magnification, optical system clock pulse, and transfer paper size. 15-3 and 15-5 are optical system control timing charts, FIG. 15-4 is an optical system control flow chart, FIG. 16-1 is a block diagram of the PLL control unit, and FIG. 16-2 is a slave. A block diagram of the CPU, Figures 16-3 (a) to (d) are control flow charts of the PLL controller, Figure 17-1 is the paper feed control timing chart, and Figure 17-2 is the paper feed controller drive. Figure 17-3 shows the paper feed control flow chart It is a door view. In the figure, 1 ... Photosensitive drum, 4 ... Developing device, 5 ...
Transfer charger, 6 ... Separating static eliminator, 8 ... Cleaning device, 10 ... Register roller, 11, 12, 44 ... Paper feeding stepping motor, 17 ... Fixing roller, 19 ... Web, 20, 2
1 …… Illumination lamp, 22 …… First scanning mirror, 23 …… Second
Scanning mirror, 26 ... Platen, 31 ... Switch flapper, 34 ... Switch sensor 1, 35 ... Switch sensor 2, 41, 43 ... Paper feed roller, 42 ... Separation roller, 46 ... … Deck lifter, 47 …… Intermediate tray, 49 ……
Intermediate tray Paper size control plate, 50 …… Original paper feed tray, 51
...... Document feed roller, 62 …… Non-sort bin, 64 …… Flapper, 66 …… Sort bin, 100 …… Main body, 101 …… Display, 102 …… Numerical key, 106 …… Copy key, 114 ……
Magnification selection key, 115 ... Magnification changeover key, 200 ... Pedal, 201-261 ... Detailed block configuration of control unit, 300 ...
… Automatic document feeder, 400 …… Collector, 501 …… Stepping motor for lens, 15-1 …… Stepping motor for optical system, Q101 …… Master CPU, Q102 …… Slave CPU,
Q103 to 106 …… Main CPU input / output port, Q107 …… ADF
CPU, Q108 ... It is a sorter CPU.

Front page continued (72) Inventor Shinichi Nakamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Masayuki Hirose 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-53-79215 (JP, A) JP-A-57-207910 (JP, A) JP-A-51-120391 (JP, A) JP-A-55-150950 (JP, A) Actual Open Sho 58-190712 (JP, U)

Claims (1)

[Claims] 1. A reciprocating member for scanning an original image, a first driving force for moving the reciprocating member in a forward direction, and a second driving force for moving the reciprocating member in a backward direction. A driving unit that applies the reciprocating member, and a scanning unit that scans the original image by applying the first driving force to the reciprocating member by the driving unit when the original image is scanned. After the end, the drive means applies the second driving force to the reciprocating member to move the reciprocating member in the backward moving direction; and the moving means in the backward moving direction after the scanning of the document image is completed. First detection means for detecting that the reciprocating member has reached a predetermined position near the stop target position; and the reciprocating member moving in the backward direction from a predetermined position near the stop target position to the stop target position. Divide the space into multiple sections Second detecting means for detecting the speed of the reciprocating member in each section, wherein the control means has caused the reciprocating member to reach a predetermined position near the stop target position by the first detecting means. When it is detected, the second detecting means is caused to detect the speed of the reciprocating member in each section from the predetermined position near the stop target position to the stop target position, and the speed is detected in each section. If the speed of the reciprocating member in each section is faster than a predetermined speed in each section, the first or second driving force is applied in the following section for a time corresponding to the speed, and detection is performed in each section. If the speed of the reciprocating member in each section is slower than the predetermined speed in each section, the first driving force is applied in the following section for a time corresponding to the speed thus detected in each section. Document scanning device, characterized in that to confer time corresponding to the speed the second driving force respectively in the following sections.