JPH0428101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder capable of feeding a copy document one line at a time using a moving body. Conventionally, on the document placement plate (contact glass) of a reflective copying machine, there have been two types: a composite document creation mask (overlay mask) in which common items such as slips are written and individual item entry fields are used as windows; Superimpose the list of items, make a copy so that the window and the specific individual item in the list are facing each other, then move either the mask or the list to make a copy between the window and the specific item in the list. A method is already known in which a desired composite copy of a slip or the like is continuously obtained by copying other individual items facing each other and repeating the same operations as described above. An automatic document feeder for continuous composite copying is required to adjust the line spacing of the list (one line a digital scale having a brightness/darkness pitch smaller than the distance from the line to the adjacent line, a counter for counting the pitch of the scale, and a feed pitch for specifying the number of scale pitches corresponding to the desired line spacing to the counter. An automatic document feeder that is equipped with a number selection switch and feeds documents one step at a time in a predetermined number of pitches in synchronization with the exposure operation of a copying machine (Japanese Patent Laid-Open No. 12934/1983).
It has been known. However, this feeding device can only feed in stages in one direction, that is, it can only feed by the value set by selecting the number of pitches, and cannot feed in steps in the opposite direction, and can only return to the home position at any time. It was hot. In recent years, a wide variety of copying machines have been developed.
Reference position for placing the original on the contact glass (position where the image position of the original corresponds correctly to the image position of the copy when the original is placed on the contact glass and copied onto copy paper of the corresponding size) ) often differ depending on the model. For example, if the document placement reference position is on the contact glass as seen from the operator,
Various types are available, such as those at the left end and front end with respect to the contact glass, and those at the right end and right end with respect to the contact glass and the front end or rear end. Furthermore, depending on the copying machine, when copied copy sheets or transfer sheets are stored one after another on a tray, there are two types: one type where the copy paper or transfer paper is stored with the copy side facing up, and the other type where the copy paper is stored with the copy side facing down. , the copied order and the stored order may be reversed. In a feeding device that can only perform stage feeding in one direction, as shown in Japanese Patent Application Laid-open No. 55-12934,
It can only be used exclusively for either the left or right side as seen from the operator, and two types of feeding devices are required, one for the left side and one for the right side. When feeding or switching from the end of the list, the feeding device can only be used in one direction, so it is necessary to set the list document upside down and use it, which is very difficult to operate. Ta. An object of the present invention is to enable line feeding from either the front side or the rear side of an automatic document feeder.
The purpose is to make the copying stock order of the copier the same as the copying order. Another object of the present invention is to make it possible to easily change the top and bottom of the display so that the display direction is not reversed when an automatic document feeder is used on either the right or left side of a copying machine. Still another object of the present invention is to prevent the line feed count display from being turned upside down when the home position of the automatic document feeder is changed. The present invention will be explained in detail below based on the illustrated embodiments. FIG. 1 shows the appearance of an automatic document feeder according to the present invention, in which a carrier bracket 2 protrudes from the lower side of a casing 1. As shown in FIG. This carrier bracket 2 is moved step by step in the direction of arrow A from the home position indicated by the solid line in order to move the original carrier 34 shown in FIG. 3 by steps relative to the overlay mask 43 (FIG. 4). It is becoming possible to do so. A display panel 30 is attached to the top surface of the casing 1, and inside the display panel 30 there are provided a feed width selection switch 3 (SW6), a line feed switch 4 (SW7), and a return switch 5 (SW8) as a home position return switch. ) is provided in the area outside the display panel, and a power switch 6,
A power indicator lamp 7 and a portable handle 8 are provided. When the power switch 6 is turned on, the power indicator lamp 7 lights up and at the same time the carrier bracket 2 is set to the home position. When line feed switch 4 is pressed, carrier bracket 2 moves to arrow A.
The line is moved by one line in the direction, and each time the line advance switch is pressed, the line is moved by one line. By pressing the return switch 5, the carrier bracket 2 is returned to its home position, no matter where it is, and returns to its initial state. The feed width selection switch 3 is a switch that selects the feed amount for one line of the carrier bracket 2, and selects and sets several feed target values that are preset regarding the feed amount (the settings will be explained in detail later). It is for. This is because there are several types of manuscripts with different line spacing. 2 to 4, the original carrier 34 is comprised of a frame 38, a pressure plate 39, and a transparent sheet 40, and an original 41 is set between the pressure plate 39 and the transparent sheet 40. A translucent material is used for the pressure plate 39 so that the position of the document can be easily determined even from above the pressure plate. The document carrier 34 has two pins 76 and 77 for carrier setting provided on the carrier bracket 2 of the automatic document feeder.
and 2 provided on the carrier frame 38.
Two frame holes 75 or 78 are set as shown in FIG. 2, and the carrier 34 is moved by movement of the carrier bracket 2. In the example shown in FIG. 3, two window holes 43A and 43B are provided in the overlay mask 43, so that two lines can be copied at the same time, thereby making it possible to simultaneously create two copies of a composite copy slip. For this purpose, the window holes 43A, 43B are provided apart by an integral multiple of the row spacing. That is,
If the multiple of line spacing is an arbitrary number n, list manuscript 4
If you use 2n lines for 1 and send [n-1] lines, you can copy all 2n lines. A mask plate 44 has a complementary shape to the overlay 43 and covers the contact glass 46 together with the overlay 43. The mask plate 44 is set on the contact glass 46, and the automatic document feeder is set at a predetermined position on the mask plate. The notch in which the overlay mask 43 is set in the notch of the mask plate 44 and the overlay 43 have the same shape and can be easily aligned. Alternatively, the overlay 43 may be provided with a convex portion for orientation, and conversely, the mask plate 44 may be provided with a notch for orientation so that the overlay is not oriented in the wrong direction when it is set on the mask plate. This is to prevent overlays and originals from being set in the wrong direction, since they are set facing downwards. FIG. 4 shows a sectional view of the automatic document feeder installed in a reflective exposure copying machine. The reflection exposure copying machine shown in this figure has a slit scanning type exposure device.
The first mirror 48, the reflection plate 49, and the exposure lamp 50 move in the scanning direction, and the second mirror 51 moves by half the amount of movement of the first mirror, so that the lens 53
A photoreceptor (not shown) is exposed to light so that the optical distance from the photoreceptor to the document surface is kept constant. Generally, in such an exposure apparatus, the lamp 50 is turned on only during exposure, and is turned off during non-exposure.
Since wasteful power consumption is prevented, one way to link this with the copying operation is to detect the blinking of the exposure lamp 50, treat the number of blinks as the number of copies to be made by the copying machine, and turn on the automatic document feeder. Interlocking is the cheapest method, and copying machines of the same type can be easily linked. Therefore, as shown in FIG.
In order to be able to detect the light from the exposure optical system located below when the exposure of the document is finished, for example when the exposure optical system returns, a lighting window 9a is provided in the bottom plate 9 of the casing of the feeding device. and a reflector 33, and a lighting window 45 on the mask plate 44.
(FIG. 3), so that the light from the exposure lamp 50 that has reached the exposure end position enters the exposure sensor 29 for detecting the end of exposure through both the lighting windows 9a and 45. Note that even without flashing, the exposure optical system scans the exposure sensor 29.
If the amount of light that enters changes, it is possible to link them. The stage feed of the document carrier 34 is performed using the exposure lamp 5.
It is sufficient to complete the process by the time 0 goes out and the next exposure starts. Furthermore, if it is desired to obtain a plurality of copies for each row, the document carrier 34 may be advanced after the exposure for the required number of copies is completed. The position where the document carrier 34 has been fed one line is shown in FIG. 2 by a chain line. FIG. 5 shows the internal configuration of the feeding device. Two guide rods 12 and 13 are installed between the side plates 10 and 11 at both ends of the casing bottom plate 9.
are installed in parallel. The above-mentioned carrier bracket 2 is movably supported on this guide rod,
An idle pulley 21 is provided at the rear of the carrier bracket 2. When a voltage is applied to the DC motor M, the motor shaft rotates, the first gear G1 mounted on the shaft rotates, and the second gear G1 sequentially rotates.
2, third gear G3, fourth gear G4, fifth gear G5, and pulley gear 14, and the drive pulley 15 is rotated. Drive pulley 1
A steel wire 28 is wound around 5, and one end of the wire is fixed to the side plate 10 via a tension pulley 16 and an idle pulley 21. The other end of the wire 28 is fixed to the side plate 11 via the idle pulley 21. Also wire 28
The tension spring 17 and the tension lever 1 are attached to the tension pulley 16 in order to apply appropriate tension to the tension spring 17 and the tension lever 1 so that the
8 gives force in the outward direction. As a result of the above, the idle pulley 21 is moved by half the amount of movement of the wire 28 based on the pulley principle. When the idle pulley 21 tries to move, the shaft of the idle pulley 21 is attached to the carrier bracket 2, so the carrier bracket 2 is moved. The direction of movement of the carrier bracket 2 can be determined by the direction of the voltage applied to the DC motor M. A light receiving section 22 and a light source section 23, which constitute a detection head 20 for detecting the position of the carrier bracket, are arranged facing each other on the carrier bracket 2, and a digital scale 19 is passed between them. The digital scale 19 stores position information on a film hooked at both ends to the side plates 10 and 11,
It consists of a light and dark mark attached to detect the amount of movement of the carrier bracket 2. As can be seen from FIGS. 5 and 15, the film is provided with a plurality of tracks 25 and 26 in its width direction, and one of them, for example, the first track 25, is often used to determine the one-stage feed distance. It has a digital scale with a finer pitch than the line spacing of list 41 shown in FIG. In this example, a mark line 73 has dark areas 73a and bright areas 73b of a constant width arranged alternately.
It's getting old. In this case, the marks, that is, the dark areas 73a are attached at equal pitches, and the length P1 of the marks is 1/2 of the pitch P2 of the marks. Also, one end of the mark line 73 has no mark, and the opposite end has a continuous mark 73C, which is used for side detection when the carrier is at the end. The other second track 26 is an auxiliary track, and the mark 71a of the mark line 71 provided here is a mark that can be arbitrarily set for pitches that cannot be set at equally spaced pitches. In this example, only one type of mark (one track) can be arbitrarily set, but the number may be increased as needed. The detection head is provided with photoelectric detectors 68 and 70 for detecting marks at positions corresponding to the first and second tracks, respectively. That is, the light source section 23 includes the light emitting elements LED1 and LED as light sources.
3 (FIG. 18), the light receiving section 22 is provided with photo sensors S1 and S3, and the track 2
For 5, the above light emitting-light receiving element pair LED1-S
In addition to 1, a second photoelectric detector 69, ie, a light emitting-light receiving element pair LED2-S2 is provided.
That is, in the mark detection sensors, S1 and S2 are sensors for detecting equally spaced pitches, and S3 is a sensor for detecting marks that are arbitrarily set and provided. Also sensor S
The interval between 1 and S2 is an interval obtained by adding 1/4 or 3/4 of the pitch P2 to an integral multiple of the pitch P2 of the mark 73a. This is to ensure that the signals of the sensors S1 and S2 (FIG. 17) are generated with a phase angle of 90°. This is done in order to detect the moving direction of the carrier bracket 2, and is a common method when using a digital scale. The signals detected by the photo sensors S1 to S3 are sent to the control unit (1) by the flexible printed board 24.
Figure 8). This signal causes the control unit to
Carrier bracket 2 controls the ON/OFF direction of energization of motor M, etc.
control the movement of The above is a basic explanation of the automatic document feeder. The unique features of the present invention will be explained in detail with reference to FIGS. 6 to 23. The basic operation is as described above. A home position changeover switch 31 (SW5) is added in order to switch the feeding direction so that line feeding can be done from either the front side or the rear side, that is, to change the home position position.
Among the switching positions of this switch 31, an example of line feeding from the front to the rear side is shown in FIG. 6, and an example of line feeding from the rear side to the near side is shown in FIG. By adding this switch, it is possible to easily switch between copying from the bottom row of the document and copying from the top row. Next, the display panel 30 can be removed from the top surface of the casing using screws 32, as shown in FIG. 8, for example. A display panel 30a (FIG. 8) for use on the left and a display panel 30b (FIG. 9) for use on the right are prepared in advance to enable panel replacement. This is to ensure that no inconvenience occurs when one automatic document feeder is set on either the right or left side of the contact glass. FIG. 10 shows an example of use when the automatic document feeder is placed on the left side, and FIG. 11 is an example of use when it is placed on the right side. Due to the presence of the home position switch, it is possible to feed from the front and from the rear, regardless of whether the feeding device is placed on the left or right side. In FIG. 11 placed on the right side, the display panel 30b for use on the right side is placed on the left side.
In the figure, a display panel 30a for use when placed on the left is used. Although it is not necessary to prepare a display panel 30 for the right side and for the left side, it has become necessary to prevent operational errors caused by reading characters backwards. Lay out the switches on the operation panel in appropriate positions so that the holes for the switches on the display panel are symmetrical, front to back, or left and right. Displays for the left and right sides on the front and back of one display panel, respectively. If you do
A single display panel can be used for both purposes, reducing costs. In this embodiment, the hole positions of the operation panel are made symmetrical with respect to the mounting screw 32 of the operation panel of the automatic document feeder as the center, and there is an indication on the front side that the operation panel should be placed on the left side with respect to the copying machine, and on the back side. The display is designed to be used when placed on the right side of the screen, so that a single display panel can be used for both the left and right sides. In an automatic document feeder that performs line feeding as described above, in which both sides of the device can be used as the home position, if the opposite side is set as the home position, the carrier bracket 2 will not come out of the automatic document feeder. There is an overhang,
When attaching the automatic document feeder to a copying machine, jamming sometimes occurred. Therefore, when the home position of the document carrier bracket is changed, by changing the mounting position of the bracket 2, the carrier bracket 2 from the document feeder can be removed.
To eliminate an overhang on a copying machine, thereby making it easy to install on a copying machine and at the same time reducing storage space. This overhang will be explained next. FIG. 12 shows an example in which the carrier bracket 2 of the automatic document feeder is moved from the home position 61 to the opposite end (limit position 62). Assuming that the length of the carrier bracket is L2, the length of the automatic document feeder is L1, and the total amount of movement of the carrier bracket is L3, the space length L4 required to move the carrier bracket is the value obtained by adding L2 to L3. However, this space length L4 exceeds the length L1 of the automatic document feeder. Originally, this type of automatic document feeder was installed as an optional unit in a copying machine for general documents, so it needed to be made compact for easy handling. It is necessary to maximize the amount of movement. "Maximum" means that documents, lists, slips, etc. generally used in offices are often A4 size, and larger manuscripts take up space for storage, so they are not used much, so the minimum is A4 size. The amount of movement. Furthermore, if the length L2 of the carrier bracket 2 is shortened, the stage feeding accuracy will be affected depending on the configuration of the means for attaching the document carrier 34. For example, as explained in FIGS. 2 and 3, the pin 77 provided on the carrier bracket 2
In the configuration in which the carrier is set in the automatic document feeder by fitting the frame hole 78 to the frame hole 78 and the frame hole 78 to the pin 76, in order to improve the ease of attaching and detaching the carrier, there is a gap between the pin and the hole. Due to the play between the carrier bracket 2 and the frame 38, when the document carrier 34 advances the bracket 2 in steps, a phenomenon that the document carrier 34 does not feed accurately may occur, which is undesirable. . As described above, since the length of L2 is required to some extent, the overhang that occurs when the document is fed to the moving end, that is, the length L5 that the carrier bracket 2 overhangs from the automatic document feeder cannot be avoided to some extent. If there is an overhang, a problem will occur if you switch the home position, or if you change from a left-hand placement to a right-hand placement, the overhanging position becomes the home position, and theゝOperability deteriorates as it has to be attached to and detached from the copying machine. Furthermore, there are cases where the automatic document feeder cannot be set because it hits another unit set in the copying machine, and a mechanism is required to prevent this. FIG. 13 shows a configuration example for eliminating this overhang, in which the carrier bracket 2 is divided into two points, a carrier bracket hook portion 64 and a carrier bracket slider portion B65, and the two divided points are By connecting them with mounting screws 63, they function in the same way as the carrier bracket 2. For this purpose, the carrier bracket hook part 64 is provided with two screw holes 66 and two screw holes 67. By selecting the location where the bracket hook portion 64 and the carrier bracket slider portion 65 are connected, that is, by selecting and using one of the screw holes 66 and 67, it is possible to eliminate the overhang of the carrier bracket at the home position. I can do it. For example, in the example shown in Figure 12, if the upper side is the home position of the carrier bracket, the carrier bracket will overhang by L5.
In order to eliminate this overhang, the mounting position of the carrier bracket hook portion 64 may be changed from the screw hole 66 to the screw hole 67 as in the example shown in FIG. FIG. 18 is a block diagram of the control section of the feeding device according to the present invention, in which a microcomputer is used. In this example, the CPU is a CPU developed by Intel Corporation.
I am using 8085. The system program is written to the EPROM 2716, which is a nonvolatile memory, and an Intel 8156, which is on the same chip, is used for I/O and RAM, and an 8212 is used as the address rack for the 2716. The reset circuit and power supply circuit are omitted. The drive circuit of motor M is connected to ports PA3 to PAφ of 8156, and the sensors S1 to S1 are connected to ports PB3 to PBφ.
3 and 29 are connected. SW1 to SW4 are feed width setting switches, SW9 is an automatic return line number setting switch, and SW10 is an exposure number setting switch, each of which functions as an encoder for ports PC3 to φ. Port PA4 has a feed width selection switch 3 for selecting one of these encoders.
(SW6) common contact is connected. port
PA5 has automatic return line number setting switch SW9
However, there is an exposure number setting switch on port PA6.
SW10 is connected. Also port PB4, PB
A line advance switch 4 (SW7) and a return switch 5 (SW8) are connected to port PC5, and a home position changeover switch 31 (SW5) is connected to port PC5. Among sensors S1 to S3 and 29, the outputs of sensors S1 and S2 are connected to inverters IC8 and IC
After passing through 9, the signals are further inverted by inverters IC6 and IC7 and applied to the first and second input terminals of NAND gate IC5 through differentiating circuits, and are also directly passed through the differentiating circuit without being inverted.
It is applied to the third and fourth input terminals of the NAND gate IC5. This 4-input NAND gate IC5
The output terminal is connected to the CPU's interrupt input terminal RST7.5. S1', S2', and S3' in FIG. 17 correspond to the output signals of sensor S1, sensor S2, and sensor S3, respectively. In the transparent part of the digital scale, sensors S1 to S3 consisting of photoresistors are energized and the output is taken out from the resistor between GND and emitter, and the waveform is shaped and inverted by inverters IC8 to IC11, so the input to the I/O port is
It becomes LOW level. If it is an opaque area, it becomes Hi level. S4 is a signal generated at the output terminal of the NAND gate IC5 at the rise and fall of the S1' and S2' signals, and is used as a signal for requesting interrupt processing of the CPU. Each of the above differential circuits shown in FIG. 18 includes capacitors C1 to C4, resistors R1 to R4, and diodes D1 to
Resistors R1 to R4 are connected to the power supply VCC, and the output of the differentiating circuit is always at Hi level, only at the moment when the input of the differentiating circuit becomes Low level.
It is set to low level. The values of the resistor and capacitor are appropriately set so that the time for this Low level does not exceed 1/8 of one wavelength of S1 and S2 in FIG. Due to the above, 4 gates
The output of the NAND circuit IC5 is S1', S in Fig. 17.
A pulse signal is generated at both the rise and fall of 2'. D1 to D4 are the input signals of the differential circuit.
When returning to Hi level, the charge of the differential capacitor and the output of the inverter become a series.
This is to prevent a potential exceeding VCC from being applied to the gate of the NAND circuit. Note that the following counters are provided as data in the RAM. SφC...Counter S1C that is incremented when the signals S1 and S2 rise and fall...Counter S2C that is incremented when the signal S1' rises and falls...Counter S3C that is incremented when the signal S2' rises and falls . . . A counter that is incremented when the signal S3' rises. Next, a method of controlling this automatic document feeder will be explained. Figure 19 shows the main routine, and the subroutines defined in it, ``initial settings'', ``home position set'', and ``line feed'', are shown in Figure 20.
These are shown in FIGS. 21 and 22, respectively. Initial Setting Although it is omitted in the circuit diagram of Figure 18, when the power switch 6 (Figure 8) is first turned on, the reset circuit is activated, and at the same time a reset signal is input to the RESET IN of the CPU and the CPU is reset. The I/O device is reset by the reset OUT signal. The reset input signal of the CPU is reset to a low level, and at the same time it becomes a high level, the program is executed from address 0. When a program is executed from address 0, the first
At step 2.0 in Figure 9, the subroutine "initialization" (Figure 20) is called, and the flags, counter data, and contents of the RAM to be used are cleared (step 2.1 ). Clearing means writing necessary data, but does not indicate setting it to φH or FFH. Next, since the 8156 is a programmable I/O, the port mode is set (step 2.2 ). In the circuit example of FIG. 18, port A is set to output, and ports B and C are set to input. Home Position Set Next, the subroutine "Home Position Set" (FIG. 21) is called for the purpose of setting the carrier bracket 2 at the home position (step 3.0 ). To set the home position, specify port PC5 to check whether the home position is specified to the left or right and check whether the home position changeover switch SW5 is ON (step 3.10 ). if,
If SW5 is open, the input of the inverter IC12 is set to High level by the pull-up resistor R11, so the output of the inverter of IC12 becomes Low level, and the input data of port PC5 of IC4 becomes Low level. Also, if SW5 is closed, the IC4 port
The input data of PC5 becomes Hi level. Therefore IC
By checking the port PC5 of No. 4, it can be determined whether the home position changeover switch SW5 is set to the "right" or "left" direction. Set the home position flag according to the set direction (steps 3.11 and 3.21 ). For the home position flag, determine the left and right data and write it to an appropriate RAM address. Then the same step
In 3.11 and 3.21 , the data of the counter S1C of the input signal of sensor S1 and the data of the counter S2C of the input signal of sensor S2 are cleared (set to φ), and the data of S1C and S2C are also stored in the RAM.
Therefore, the contents of the addresses corresponding to the data of S1C and S2C are set to φH. Next, the motor M is energized to set the carrier bracket 2 at the home position.
As shown in FIG. 18, the motor drive circuit can rotate the motor M in forward and reverse directions by energizing transistors Tr1 and Tr4 or Tr3 and Tr2, and can also control the rotational speed by changing the energization angle. I'm starting to be able to do it. Therefore, transistors Tr1 and Tr4 or Tr3 and Tr2 are energized so that the direction of rotation is to move toward the home position (step 3.13 ,
3.23). In FIG. 18, it is sufficient to set the bit of each corresponding port A to Hi level. When the motor M is energized and the carrier bracket moves due to the rotation of the motor, signals S1', S1', and S1' based on the digital scale are sent to the sensors S1, S2, and S3.
S2' and S3' occur. As already mentioned, by sensors S1 and S2
The pulse signal generated in NAND gate IC5 is S
4, which is input to the RST7.5 input terminal of the CPU and used as a signal for interrupt processing.
In the interrupt processing of RST7.5, the pulses processed by the interrupt are counted by a counter SφC, a counter S1C is used to count the interrupt processing generated by S1, and a counter SφC is used to count the pulses processed by the interrupt processing.
There is a counter S2C that counts the number of interrupts processed by 2, and as mentioned above,
It is stored as data in RAM. These counting flowcharts are as shown in FIG. 23, and will not be particularly explained. Next, it is checked whether the difference between counters S1C and S2C exceeds 2 (steps 3.14 and 3.24 ).
The carrier bracket 2 is moved to the home position, but if the carrier bracket 2 is moved to the home position Z1 or Z2.
(FIG. 17), there is no change in the level of S1' or S2'. Therefore, the difference between counters S1C and S2C exceeds 2. S1C and S2C
When the difference between the signals becomes 2 or more, the process proceeds to steps 3.18 and 3.28 , and the signal S2' whose level does not change is
Or check the level of S1'. When the home position is "right", that is, Z1 in Fig. 17, the signal S
2' should be at Hi level, and in the case of the home position "left", that is, Z2 in Fig. 17, the signal S1' is
It should be low level. After confirming this,
In order to reverse the motor M, transistors Tr1,
Turn off Tr4 and turn on Tr2 and Tr3 (steps 3.19 and 3.29 ). After the motor M is reversely rotated, the position where the level of the signal S1' or S2', which has no longer changed, returns to a position where the level changes is determined as the home position (steps 3.20 and 3.30 ).
Each counter, row counter SφC, S1C, S2C,
Clear S3C to φH and stop energizing motor M (steps 3.31 and 3.32 ). Incidentally, if the carrier bracket 2 is at the mechanical limit position on the home position side from the beginning, the carrier bracket does not move and the signals S1' and S2' are not generated, so that the position cannot be detected. Therefore, a loop counter is provided and by checking whether the carrier bracket has not moved for a certain period of time, it is detected that the carrier bracket is at the home position where it does not move (Steps 3.12 , 3.15 to 3.17 ; 3.22 ,
3.25~ 3.27 ). Through the above steps, the carrier bracket is set at the home position. Next, the CPU turns on the manual return switch SW8.
(Step 4.1 ). If NO, check whether the home position has changed (Step 4.2 ). If it has not been changed, next check whether the manual one-line advance switch SW7 has been turned on (Step 4.3 ). If NO, the process advances to a copy exposure end check (step 4.4 ), and if YES, the process immediately advances to step 5.0 to begin the line feed operation. Exposure Once the home position is set, set the original and set the copier to copy mode. When the copying machine enters the exposure state, the light from the exposure lamp hits the exposure sensor 29, and the input signal at the port PBφ becomes low level.When the exposure is completed, the exposure lamp goes out, and the sensor 29 is no longer exposed to light, and the input signal at the port PBφ goes low. The Hi level indicates that one copy has been executed (Step 4.4 ). Next, when one sheet is copied, a counter indicating the number of exposures is incremented. This counter is referred to as an exposure counter. The value of this exposure counter is
Check whether it matches the contents of exposure number setting switch SW10 (step 4.5 ). In this case the switch
SW1-4, SW9, SW10 are a diode matrix, and by setting any one of ports PA4, 5, 6 to high level, SW1-4, SW9,
The contents of SW10 can be read at ports PCφ~3. Also, the feed width setting switches for SW1 to SW4 are
It is selectively used by SW6's feed width selection switch. The contents of the exposure number setting switch SW10 can be read by setting the port PA6 to Hi level. When the number of exposures matches the contents of exposure setting SW10, step 5.0 is executed to perform line feed.
Then, the subroutine "line feed" shown in FIG. 22 is called. Line feed To find out what feed width is preset by the feed width selection switch SW6, try setting port PA4 to Hi level. Port PC4
is low level, that is, tracks 25 and 26.
Check whether one of the scales is selected (step 5.1 ). When port PC4 is at Low level and the reference scale (track 25) is selected, ports PCφ~3 are specified and the feed width setting switch SW1 selected by SW6 is set.
~ Read the contents of SW4 (feed width) (step
5.2), line feed is performed based on the signals of sensors S1 and S2. On the other hand, when the port PC4 is at Hi level and the digital scale of the second track 26 is selected, line feeding is performed by the signal from the sensor S3. Check the home position flag and turn on the motor drive circuit (steps 5.3 , 5.4 , 5.5 ). In the case of the standard scale (track 25), when the contents of the counter SφC increase by the predetermined number of pitches (steps 5.6 to
5.8), and in the case of an arbitrary scale (track 26), when the contents of counter S3C increase by +1 (steps 5.9 and 5.10 ), the motor is stopped (step
5.11), increment the row counter (step 5.12 ). This completes the step-feeding for one line. When the line feed is performed, the line feed waits until the line is exposed again and the exposure is performed the set number of times (steps 4.4 , 4.5 , 5.0 ). 1st
If the number of lines equal to the number set by the automatic return line number setting switch SW9 in Figure 8 is sent (Step 6.1 ) or the opposite side end is reached (Step 6.2 ). ), the carrier bracket is returned to the home position. By the way, when using the digital scale of the second track 26 in FIG. 15, that is, the arbitrary mark line 71, conventionally the carrier bracket 2 is always set at the home position Z2 by the sensor S1, and then the carrier bracket 2 is set at the same position as the sensor S1. sensor S
3, an arbitrarily set mark 71a is detected and sent. This is truck 2
This is to prevent the home position from changing regardless of which scale, 5 or 26, is selected. However, if configured to send from the opposite direction (15th
In the example shown in the figure, when feeding from the right side), it is necessary to set the home position Z1 using the sensor S2 and send it to the next mark 71a using the sensor S3. However, if the marks 71a are simply placed at equal intervals P3 in the positive direction (from left to right in the example of FIG. 15),
If an attempt is made to use that mark from the opposite direction, the first feed pitch in the example of FIG. 15 becomes L7, which does not match the feed pitch P3. However, it is only the first pitch that does not match, and the subsequent pitches become normal. However, if even one feed pitch does not match, the line will not match the overlay 43, which is a problem. The example shown in FIG. 16 attempts to solve this problem. In the example shown in Fig. 16, even if the left or right side is used as the home position and the mark 72a, which is an arbitrary pitch mark, is used, the same pitch can be obtained. can. In this way, the length of mark 72a is L10.
The scale length of the mark line 73 which is a reference scale is L8, the arbitrarily set feed pitch is P3, the interval between sensors S1 and S2 is L6,
If the distance based on the total number of feed lines of the arbitrarily set feed pitch P3 is L9, this can be implemented by satisfying the following. (The total number of lines to be moved is the value obtained by subtracting one line from the number of lines to be copied. This is because one line can be copied without moving the line in the home position.) L9=P3× (n-1) n=number of lines to be copied L8=L9+L6+P3+L10 ∴L10=L8-L9-L6-P3 The mark length L10 may be set as shown in the above formula. In FIGS. 8 and 24, 80 indicates a line feed count display device. As mentioned above, in an automatic document feeder in which the home position of the carrier bracket of the document carrier can be switched to the front side or the rear side with respect to the automatic document feeder,
When displaying the number of times a document has been sent, the orientation of the displayed content is an issue. That is, if the count display device is turned upside down as shown in FIGS. 10 and 11a, the contents of the count display will be upside down. In order to eliminate such problems, the control circuit of this embodiment uses a microcomputer system to switch the top and bottom of the display contents. The embodiment shown in FIG. 24 uses a one-chip CPU μcom43 developed by NEC Corporation. [Table] [Table] First, create numerical data (Table 1) specified at a predetermined address in the ROM. Also, in the specified address of RAM (this time the 1st data is
(RAMφEH, store the 10th data in φFH) Count how many lines have been sent using the signal from the input port, and store that data in RAM. As shown in FIG. 25, by checking whether the home position changeover switch SW5 is ON, it is determined whether to use ROM data or not, and the RAM data is converted and displayed. For example, let's say that you have now performed line feed 23 times. In this case, the first RAM (φF address)
3 (φφ11) is stored in , and 2 (φφ1φ) is stored in the 10th RAM (φE address). When the home position switch SW5 is ON (in the position shown in Figure 10), use the ROM data, first output data 5BH for the 10th position to ports C to D, and at this time output the port Fφ. 〓 is displayed in the 10th place (steps 8.10 and 8.20 ). Next, output position data 4FH to ports C to D, and at that time output port F1, 〓 will be displayed (steps 8.30 and 8.40 ),
〓 is displayed on both sides (see Figure 26a). When the home position changeover switch SW5 is OFF (in the position shown in Figure 11b), the ROM data is used, and 79H, which is converted from the first data in RAM, is output to ports C to D, and then port Fφ If you output (step
9.10, 9.20 ), 10th place indicator 81 shown in Figure 24
〓 is displayed on the left side display in Fig. 8.
Next, output 5BH, which is the converted data of the 10th position of RAM, to ports C to D, and at that time output the port F1 (steps 9.30 , 9.40 ), the 1st position display 82 (8th 〓 is displayed on the right side display (see Figure 26b). Therefore, the 10th
If you look at this display in the position shown in the figure, you will see 〓, but since the document feeder is installed in the opposite direction from that in Figure 10, you will see 〓, which is the opposite of 〓. Figure 26a shows the details of the display when the top and bottom of the display device are as shown in Figure 10, and Figure 26b
11b shows details of the display method in the case of FIG. 11b. In the case of Figure 26a, clear the digits,
The number at the 10th place of the counter is placed in the accumulator ACC and a multi-branch instruction is executed (steps 8.11 to 8.13 ).
When executing the multi-branch instruction JPA, depending on the contents of ACC,
The jump destination will be automatically selected. For example, ACC
If the content of is “9”, segment by JPA
DATA6F is output to ports C~D (port
Cφ=1, C1=1, C2=1, C3=1, port DD=φ, D1=1, D2=1, see Table 1 ROM data). Set port Fφ and display the 10th position (step 8.20 ). Next, put the number at the 1st place in the counter into the accumulator ACC, execute a multi-branch instruction, and output segment data (step
8.31~ 8.33 ). Set port F1 and display the first position (step 8.40 ). The same applies to the case of FIG. 26b. However, the 26th
Unlike the case in figure a, counter 1 is set in step 9.12 .
The number of digits is then 9.31 , and the number in the 10th place of the counter is put into the accumulator. Furthermore, ROM data is used for segment data. Note that when the multi-branch instruction JPA is executed, the jump destination is automatically selected according to the contents of ACC as in Figure 26a, but
For example, if the content of ACC is "9", JPA outputs segment DATA7D to ports C to D (ports Cφ=1, C1=φ, C2=1, C3=
1, Port Dφ=1, D1=1, D2=1, Table
1ROM data). In this way, regardless of how the automatic document feeder is installed, the count can be displayed on one display by switching the document feed count display between forward and reverse using the changeover switch. In the above embodiment, the display is automatically changed by the home position changeover switch SW5, but a dedicated switch for changing the display may be provided separately from the home position changeover switch. By providing a display changeover switch, for example, when the home position is up at the set position shown in Figure 11 (original feed is set to
If the display is moved from the top to the bottom of the diagram), the display will be reversed if it is linked with the home position switch, so this problem can be solved by providing a separate display changeover switch. This is effective when reversing the order of copy sheets. Because if you normally make 10 copies,
This is because the first copy will be at the bottom of the top of the copy receiver. As described above, the feeding device of the present invention has the home position changeover switch 31 (SW5), checks the changeover position of this switch during line feed, and rotates the motor in the forward direction at one changeover position of the switch. At the other switching position, the carrier bracket is moved in stages while the motor is reversed, so the home position of the carrier bracket 2 of the document carrier can be easily changed to the front or rear side with respect to the feeding device. You can switch to the side. In other words, since it can be used on the right or left side of the copying machine, and can be used from the end or the beginning of a line, copies can be stored in the stocker of the copying machine in accordance with the order of the lines. Furthermore, regardless of whether the contact glass is set on the right or left side, the display panel and the vertical direction of the line feed count display can be changed to the normal direction for the user, improving operability. Therefore, the present invention is applicable to all cases in which the reference position for placing a document is on the left end or the right end on the contact glass, or in which stage feeding is performed from the beginning of a line or stage feeding is performed from the end of a line. can be done.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the automatic document feeder of the present invention, FIG. 2 is a perspective view showing the relationship between the document feeder and the document carrier, and FIG. 3 is a diagram showing the relationship between the document carrier, overlay mask, and mask plate. 4 is a schematic cross-sectional view showing the feeding device set on the contact glass of the copying machine, FIG. 5 is a perspective view showing the internal structure of the feeding device, and FIGS. 6 and 7 are home position diagrams. FIG. 8 is a perspective view showing the relationship between the display panel and the feeder main body, FIG. 9 is a perspective view showing the display panel for right-hand use, and FIG. The figure is a plan view showing an example of use in which the feeding device is placed on the left side of a copying machine, Figures 11a and b are plan views showing an example of use in which the feeding device is placed on the right side of a copying machine, and Fig. 12
The figures are for explaining the dimensional relationship of each part when the carrier bracket moves from the home position to the limit position on the opposite side, Fig. 13 is a perspective view showing another example of the structure of the carrier bracket, and Fig. 14 13 is a plan view showing the relationship between the home position and the side where overhang occurs when the carrier bracket is installed on the opposite side, FIG. 15 is a diagram showing an example of the configuration of a digital scale, and FIG. The figure shows a modified example of the digital scale, Fig. 17 shows three sensor outputs and one composite output obtained from the digital scale, Fig. 18 is a block diagram of the control section, and Fig. 19 shows the control section. 20 to 22 are flowcharts showing the main routine, FIGS. 20 to 22 are diagrams showing its subroutines, FIG. 23 is a diagram showing a counting routine for interrupt processing, FIG. Figures 25 and 26a,
b is a flowchart showing how to control the display. 2...Carrier bracket, 3...Feed width selection switch (SW6), 4...Line feed switch (SW7), 5...Return switch (SW8), 19
...Digital scale, 20...Detection head, 2
2... Light receiving section, 23... Light source section, 25... First track, 26... Second track, 29... Exposure sensor, 30... Display panel, 31... Home position changeover switch (SW5), 34... Original carrier, 41... Movable original (list), 43... Overlay mask, 44... Mask plate, 45...
Lighting window, 46...Contact glass, 64...Carrier bracket hook part, 65...Carrier bracket slider part, 66, 67...Screw holes,
68...Detector, 69...Detector, 70...Detector, S1, S2, S3...Sensor, 80...Line feed count display device, 81...10th place display, 82
...1st place indicator.

Claims (1)

[Scope of Claims] 1. In an automatic document feeder capable of feeding a copied document line by line using a moving body, the number of lines to be fed by the moving body is set, and when this number of lines is reached, the moving body is automatically moved. an automatic return line number setting switch for returning to the home position, a manually operable home position changeover switch, and a control circuit; the control circuit is configured to switch the home position changeover switch; A driving motor of the movable body is rotated in a required rotation direction according to the position, and the motor is stopped in response to a detection signal from a detection means that detects that the movable body has reached the home position, and the movable body is advanced by one line. In this case, at one switching position of the changeover switch, the movable body is forward-rotated while the motor for moving the movable body is rotated in the forward direction, and at the other switching position, the movable body is forward-fed while the motor is rotated in the reverse direction. An automatic document feeder characterized in that the home position of the moving body can be switched to the front side or the rear side with respect to the feeder.