JPH01265777A - Picture reader - Google Patents

Abstract

PURPOSE:To reduce the wait time and to prevent the key operation left unswitched by placing the priority of reading of an original stationary type read device when an original exists to both a original moving type read mechanism and the original stationary type rad mechanism and applying the original moving type reading automatically after the read of the original stationary type read mechanism. CONSTITUTION:When the 1st sensor S1 and the 2nd sensor S2 sense an original alternatively in case of depressing a start switch, the read mechanism corresponding to the sensor sensing the original is actuated. On the other hand, when both the sensors S1, S2 detect the original, the original stationary type read mechanism 31 is actuated with priority to apply the original stationary type read and the original moving type read mechanism 30 is operated automatically after the end of reading to apply picture reading. Thus, the wait time of operation is decreased and the key operation left unswitched for the original moving type reading is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image reading apparatus equipped with a moving document reading mechanism and a stationary document reading device.

The sub-L plate original moving type reading mechanism refers to a mechanism in which the reading optical system is stationary and reads the image drawn on the original while moving the original □ with respect to this optical system. The term "stationary document reading mechanism" refers to a mechanism that reads the document while it is placed on the document glass surface 6^ and reads the document image while moving the optical system in the sub-scanning direction.

The former reading mechanism is AD F (Auto Docum
It is suitable for reading sheet-like originals by combining it with the ENT Feed-e'r), and the latter reading mechanism is suitable for reading arbitrary pages in thick books such as books. ing.

Since there are various kinds of originals, such as sheets and books, which are used in facsimile machines, copying machines, etc., various image reading apparatuses equipped with the above two reading mechanisms have recently been proposed. However, in both devices, in order to simplify the configuration, the reading optical system is shared by the moving original reading mechanism and the stationary original reading mechanism.

By the way, conventionally, in image reading devices equipped with a moving original reading mechanism and a stationary original reading mechanism, it is common to select which reading mechanism performs the image reading operation using a selection switch provided on the operation panel. It is true.

I'm trying to do it first!- However, if the method is to select using a selection switch,
The number of keys on the operation panel increases, and the operation is complicated because it is necessary to operate a selection switch in addition to the start switch.

In order to solve this problem, each reading mechanism is equipped with a sensor that detects the presence or absence of a document, and when a document is set, the corresponding sensor detects this and automatically reads the image. This is possible, but in that case, if a document is loaded into both reading mechanisms at the same time, there remains a problem as to which reading mechanism should be activated.

In view of these points, the present invention provides a useful method that automatically performs a moving document reading operation after a stationary document reading operation when the start switch is pressed, thereby shortening the waiting time for the operation. The present invention provides an image reading device.

In other words, the present invention provides a document moving type reading mechanism that moves the document to a predetermined reading position and reads the document image by an optical reading means disposed at the reading position; a stationary document reading mechanism that places a document on a document placing plate 2 and reads the document image by moving an optical reading device in the sub-scanning direction; An image reading device that is configured to be used in a stationary document reading mechanism includes a start switch for starting an image reading operation, and a switch for detecting that a document is set in the moving document reading mechanism. a second sensor that detects that a document is set in the stationary document reading mechanism; and a sensor that selectively activates the first sensor and the second sensor when the start switch is pressed. When a document is being detected, the reading mechanism corresponding to the sensor on the side that is detecting the document is activated;
When both sensors detect a document, the stationary document reading mechanism operates preferentially and reads the document stationary? The apparatus is characterized by comprising a control means for automatically operating the document moving type reading mechanism to perform an image reading operation after the reading operation is completed.

As mentioned above, the moving original reading mechanism is suitable for reading sheet-like originals, and the stationary original reading mechanism is suitable for reading books such as wood. In this case, a large number of pages, such as 50 or 100 sheets, may be read at a time from a sheet document, but it is sufficient to read at most a few pages of a book or other document. Therefore, when originals are set in two reading mechanisms at the same time, if the moving original reading mechanism is operated with priority, the stationary original reading mechanism only has one.
To scan two originals, wait until the machine finishes reading a large number of originals, such as 50 or ], 00 sheets.
Otherwise, it would be a huge waste of time.

On the other hand, in the present invention, in the same case, the stationary document reading mechanism is activated, so the mechanism requires less waiting time, which is reasonable.Furthermore, in the present invention, the stationary document reading operation is completed Afterwards, that is, when the document is removed from the reading mechanism section, the document moving type reading mechanism automatically operates and starts the reading operation without pressing the start switch.

Therefore, it is possible to prevent forgetting to operate a key for the moving document reading operation after the stationary document reading is completed.

1-1-First Consistency FIG. 1 is a perspective view showing the external appearance of a facsimile 20 to which an image reading device according to the present invention is applied.

Attached to one side wall of the main body 21 of the facsimile 20 is a document placement plate 22 on which a single document Pa is placed. Further, a document converter 23 for setting a thick document PB is attached to the main body 21 on the back side of the main body 21 by a hinge (not shown) so that it can be opened and closed in the direction of the arrow 24. A recess 25 is formed in the center of the document set cover 23. The bottom surface 25a of the recess 25 is formed to be inclined in a direction that moves away from the upper surface of the document set cover 23 toward the document placement plate 22 side. This recess 25 functions as an ejection tray into which the original pa is ejected after the original reading has been completed, as will be described later.

2 is a sectional view taken along the line nn in FIG. 1, and FIG. 3 is a perspective view showing the drive system of the image/reading device included in the facsimile 20.

A transmitter 32 is provided at the upper part of the main body 21 to read a document and transmit the document image via a telephone line. Furthermore, a receiving section 33 is provided below the transmitting section 32 in the main body 21 . The receiving section 33 is a printer for recording received images, and includes an optical scanning body 152 having a laser diode around a photosensitive drum 151, and a developing unit 1.
53, a transfer unit 154, etc. are arranged. The imaging process of this printer follows the known electrostatographic process.

That is, an electrostatic latent image is formed on the circumferential surface of the photoreceptor drum 151 by a laser diode 152 that emits light based on the received image, and after it is visualized as a toner image by a developing unit 153, it is transferred to a transfer unit 154 to feed paper. Cassette 1
The toner image is transferred onto the transfer paper fed from the 55 side. After the transfer, the transfer paper is fixed by a pair of fixing rollers 156 and discharged to a tray 157 outside the machine. In the figure, 158
Transfers the transfer paper sheet by sheet from the paper feed cassette I55 to the transfer section 15.
This is the paper feeding roller that feeds the paper to 4. Incidentally, the optical scanning body can also use a light emitting diode array in addition to a laser diode as a light emitting section.

The transmitter 32 includes a moving document reading mechanism 30 and a stationary document reading mechanism 31 located downstream of the moving document reading mechanism 30 in the document moving direction.

The document moving type reading mechanism 30 includes automatic document feeding means 40,
It is composed of a document glass 41 provided at the document reading position iE, an optical reading means 42, and the like. The stationary document reading mechanism 31 includes a document set cover 23, a document glass 100, an optical reading means 42, and the like. That is, the optical reading means 42 is configured to double as reading means in the moving original reading mechanism 30 and the stationary original reading mechanism 31. In addition, original glass 4
1 and the original glass 100 are at the same height position.

The automatic document feeding means 40 includes a paper feeding drive roller R1, a paper feeding driven roller R2, an endless paper feeding belt 45 wound between the rollers R1 and R2, and a separating roller R3 that presses against the roller R2;
A pair of transport rollers R4 that transports the original to the original reading position
, R5, and a pair of ejection rollers R6 and R7 for ejecting the original after reading has been completed. Rollers R4 and R6 are driving rollers, and rollers R3', 'R5 and R7 are driven rollers. The rotational axes of these rollers R] to R7 are all parallel to each other.

A first electromagnetic clutch C is coaxially connected to the rotating shaft of the roller R1.
A pulley 46 with an electromagnetic clutch and two wheels is fixed to the roller R4, and a one-way clutch 47 and a pulley 48 are fixed coaxially to the rotating shaft of the roller R4. Further, a one-way clutch 49 and a pulley 50 are coaxially fixed to the rotating shaft of the roller R6. Further, in connection with driving the optical reading means 42, another second electromagnetic clutch C is connected.
A pulley 51 with an electromagnetic clutch 2 is provided, and an auxiliary pulley 52 is provided between pulleys 46 and 48. These pulleys 46, 52° 4.8.50.5
1 and a pulley M fixed to the output shaft of the drive motor M.
1, an endless timing heald 53 is wound around it. Note that the motor M is capable of forward and reverse rotation, and is realized by, for example, a stepping motor. By reversing the motor M and turning the electromagnetic clutches CI and C2 on and off, a moving original reading operation and a stationary original reading operation are performed.

The optical reading means 42 includes an optical scanning body 67 that is movable in the direction of an arrow 66, and a photoelectric conversion element that is realized by mirrors 62, 63, a condensing lens 64, a CCD, etc. housed in the optical scanning body 67. 65, and a pair of light sources 60 attached to the upper surface of the optical scanning body 67. ．． 61 and mirror 6
8.69. A pair of lights like this 11JX60
, 61, image reading accuracy can be improved. Further, a flexible cable 70 is attached to the optical scanning body 67 for extracting electrical signals from the photoelectric conversion element 65. When reading an image, light from light sources 60 and 61 is irradiated onto the original image, and the reflected light is guided to the mirror 63 via the slit 71, and then to the photoelectric conversion element 6 via the mirror 62 and the condensing lens 64.
5.

The light is then converted into an electric signal corresponding to the amount of light received by the photoelectric conversion element 65 and provided to the signal processing circuit via the flat cable 70.

A thrust bearing 73 is embedded in one end of the optical scanning body 67 in the longitudinal direction, and a guide rod 74 extending parallel to the moving direction 66 of the optical scanning body 67 is connected to the thrust bearing 7.
3 is inserted. Further, a pulley 75 is attached to the other end of the optical scanning body 67, and this pulley 75 can run along a flat guide surface 76. Further, the upper support frame of a timing heald 77 is fixed to the optical scanning body 67, and this timing held 77 is connected to a pulley 78°7.
It is wrapped around 9. The electromagnetic clutch-equipped pulley 51 is fixed coaxially to the rotating shaft 80 of the pulley 79 . Therefore, the rotational driving force of the pulley 51 is applied to the electromagnetic clutch C.
2 to the pulley 79, the optical scanning body 67 is movable in the direction of arrow 66.

In addition, in FIG. 2, Sl indicates the original P on the original placing plate
This is the first sensor that detects whether or not a exists. S2 is a second sensor that detects whether or not the original Pb exists on the original glass 1oo, and S3 is a third sensor that detects that the leading and trailing edges of the original Pa have reached the original reading position E. It is a sensor. Furthermore, S4 is an optical scanning body 67
a fourth sensor that detects that the is in a standby position;
S5 is a fifth sensor that detects that the optical scanning body 67 is at the scanning start position. First to third sensors S1 to S
3 is an optical sensor, for example, and fourth and fifth sensors S4.
S5 is, for example, a limit switch.

FIG. 4 is a block diagram showing the electrical configuration related to the image reading operation of the facsimile 20. Detection signals from the first to fifth sensors S1 to S5 are provided to the CPU 90. Further, operation signals from the reading start key 2 and the document size designation key 3 for specifying the document size during stationary document reading are given to the CPU 90. Furthermore, the number of drive pulses is given to a counter 96 within the CPU 90. The CPU 90 controls the motor drive circuit 91, the clutch drive circuit 92 for the electromagnetic clutch C1, and the electromagnetic clutch C based on these detection signals, operation signals, and pulse signals.
A control signal is output to the clutch drive circuit 93 for 2, and the motor M is rotated in the forward and reverse directions and stopped, and also υ+electromagnetic clutch CI,
Controls the on/off of C2.

FIG. 5 shows a MayFront system that determines whether to select either the stationary document reading mode or the moving document reading mode based on the detection signals of the first sensor S1 and the second sensor S2. In the initial state, the optical reading means 42 is stopped at the standby position shown by the solid line in FIG. First, when it is determined in step β■ that 2 has been pressed on the start key, the state of the second sensor S2 is checked in step β2. Second
If the sensor S2 detects the document pb, step 7
! Proceeding to step 3, a subroutine for reading the original by the static original reading mechanism is executed. Then, the process proceeds to step p4, and it is determined whether the second sensor S2 detects the presence of the document Pb. If the second sensor S2 detects the presence of the document Pb, the process proceeds to step β5, where it is determined whether or not the start key 2 has been pressed, and if the start key has not been pressed, the process returns to step p4. When 2 is pressed on the start key in step p4, the process returns to step 123. In this way, the original static reading operation is performed, and after the original reading is completed, the original pb is removed from the original glass 1σO, and step! 4 to step 16, the first sensor SI
It is determined whether or not the document Pa has been detected. When the first sensor S1 does not detect the presence of the document Pa, the process ends. On the other hand, if the first sensor S1 detects the presence of the original Pa, the process proceeds to step β7, and a subroutine for reading the original Pa with the original moving type mechanism is executed. This subroutine is repeated until the first sensor S1 no longer detects the document Pa (step n8). Then, when the first sensor S1 no longer detects the document Pa, the process ends.

If the second sensor S2 does not detect the presence of the document pb in step 122, the process proceeds to step 19, where it is determined whether the first sensor S1 detects the presence of the document Pa. When the first sensor S1 detects the presence of the document Pa, the process advances to step 7. If the first sensor S1 does not detect the presence of the document Pa, since there is no document in any of the reading mechanisms, the program returns to its original state and waits until the next time the start key is pressed.

In this way, when both the first and second sensors Sl and S2 are on, step I! 1-Step I! 2-Step f! 3
- Step N4 (including the closed loop of steps β4 and β5 and the closed loop of step N3. β4175) - Step C6 → Step ρ7 - Step! 8 (step β
7 and 18)--Processing ends. As a result, when 2 is pressed on the start key, the original stationary type reading operation is performed preferentially, and after the end of the reading operation 7, the original moving type reading operation is automatically performed without pressing 2 on the start key. Therefore, the waiting time can be shortened, and it is possible to prevent forgetting to perform the next document moving type operation.

Further, when the first sensor S1 is off and the second sensor S2 is on, step 11 → step 12 → step β
3→Step 7!4 (including the closed loop of step p, 4° β15 and the closed loop of step pp3.7!4', x5) - Step β6 - Processing ends. Therefore, the processing proceeds as follows. Only static document reading operations are performed.

Further, when the first sensor S1 is on and the second sensor S2 is off, step β1 → step p2 → step I
! 9 → Step 7! 7 → Step jl! 8 (step j
27. /! (including the closed loop of '8) - Processing ends, and so on. Therefore, only the original moving type reading operation is performed.

Moreover, the first and second sensors s1. When both S2 are off, the process proceeds as follows: step 11→step j22→step 19-step 11. Therefore, the reading operation is not performed in both the document moving type and the document stationary type.

FIG. 6 is a flowchart showing the subroutine of step β3 in FIG. First, when the document moving type reading mode is entered, the program proceeds to step m1, and drive state A is set in Table 1. That is, the motor M is driven in normal rotation, the electromagnetic clutch C1 is in the on state, and the electromagnetic clutch C2 is in the on state.
is turned off.

Table 1 As a result, the rollers R1, R4, R, and 6 are rotationally driven in the normal rotation direction. Incidentally, since the electromagnetic clutch C2 is in the off state, the pulley 51 is not driven to rotate, and therefore the optical scanning body 67 remains stopped at the standby position. Laura R
1 rotates the paper feed heald 45 in the direction of the arrow mark, whereby the document Pa on the document placement plate 22 reaches the nip line F between the separation roller R3 and the paper feed roller R1. Then, by the action of the separation roller R3, only the lowest original Pa among the plurality of originals Pa is fed and supplied between the transport rollers R4 and R5. The document Pa is then conveyed toward the document reading position.

Then, in step m2, it is determined whether the leading edge of the document Pa has reached the document reading position E. When the leading edge of the document Pa reaches the document reading position, a detection signal from the third sensor S3 is given to the CPU 90, and the process moves to step m3, where the motor M is stopped and the electromagnetic clutch CI is turned off. state. As a result, the driving states of the rollers R1, R4, and R6 are all stopped as shown in Table 2. This state is the document reading state.

Table 2 and step m4 instruct the optical reading means 42 to perform a reading operation. As a result, the light source 6o of the reading means 42
, 6i are driven to emit light. At the same time, step m
At step 5, the motor M is again driven in normal rotation. Furthermore, electromagnetic clutch C
L C2 remains in the OFF state] 9, leading to the drive state B shown in Table 1.

At this time, the rotational speed of the motor M is set to be a sub-scanning speed that is slower than the rotational speed at the time of paper feeding described above.

By driving the motor M to rotate in the normal direction, the rollers R4 and R6 are driven to rotate in the normal rotation direction as shown in Table 2, and enter a reading operation state. During this reading operation, roller R4
, R5, R6 and R7, the document Pa is conveyed, and as the document Pa moves on the paper feed heald 45, the roller R1 is rotated accordingly.

During such a reading operation, when the original Pa passes through the original reading position E, the optical reading means 42 reads the original image. Note that the rear end of the document Pa is connected to the roller R1.
, R2, the rotation of the roller R1 stops thereafter as shown in Table 2. Then, it is determined in step m6 whether or not the rear end of the document Pa has reached the document reading position E, and the third sensor S3 detects whether the document Pa has reached the document reading position E.
When the rear end is detected, the process moves to step m7, the reading operation of the optical reading means 42 is stopped, and the motor M stops rotating in step m8. As a result, roller R1,
R4 and R6 stop rotating as shown in Table 2. Then, in step m9, the motor M is driven to rotate in the normal direction again. At this time, the rotational speed of the motor M is set to be higher than the sub-scanning speed, similar to the rotational speed in the paper feeding operation described above. As a result, as shown in Table 2, roller R1 remains stopped, and rollers R4 and R6 are rotated in the normal rotation direction. This causes the original ejection operation to take place.
After the image reading is completed, the original pa is discharged into the recess 25.

FIG. 7 is a flowchart showing the subroutine of step 17 in FIG. First, when the document stationary reading mode is entered, the program proceeds to step n1. step n
In step 1, it is determined whether or not the size of the original Pb has been specified using the original size specification key 3°, and when specified, the distance from the scanning start position to the original reading end position, which will be described later, is stored in the memory within the CPU 90. Ru. Then, the process moves to step n2, and the drive state C shown in Table 1 is set. That is, the motor M is driven to rotate in the forward direction as shown in Table 1, the electromagnetic clutch C1 is turned off, and the electromagnetic clutch C2 is turned on. As a result, the pulley 79 is rotationally driven in the forward direction, and the optical scanning body 67 moves along the guide rod 74 in the direction of arrow 7666a. Then, it is determined in step n3 whether or not the optical scanning body 67 has reached the starting position shown by the imaginary line in FIG. Then, in step n5, an instruction to start reading is given to the optical scanning means 42, and the light sources 60, 6] are driven to emit light.

Then, in step n6, the driving states shown in Table 1 are set. That is, the motor M is driven in the reverse direction as shown in Table 1, and the clutch C1 remains off and the clutch C2 remains on. The dirt causes the pulley 79 to rotate in the reverse direction, thereby causing the optical scanning means 67 to move in the direction of the arrow 66b. Note that the rotational speed of the motor M during reverse rotation is set to a sub-scanning speed smaller than the rotational speed during normal rotation.

Also, at this time, rollers R4 and R6 are connected to the one-way clutch 4.
The rotation is stopped by the actions of 7, 4 and 9. For your reference, when the stationary document reading operation is performed while the ejection operation of the last sheet of the original in the moving document reading mode is not completed, the optical scanning body 67 moves from the standby position to the scanning start position. Normally, the manuscript Pb
ejection operation has been completed. However, if the motor M rotates in the opposite direction when the original is not completely ejected,
If one-way clutch 4-. If 7.49 is not provided, the rollers R4 and R6 rotate in the reverse direction, so the document Pb flows backward into the document moving type reading mechanism, and the ejection operation is not performed. In this embodiment, one-way clutch 4.7. By providing j9, rollers R4, R6
can be prevented from rotating in the reverse direction, and the occurrence of a defective ejection operation can be prevented.

While the optical scanning body 67 is moving from the start position to the standby position, the original image of the original Pb on the original glass 100 is read. Then, in step n7, it is determined whether the optical scanning body 67 has reached the reading end position. That is, when the scanning body 67 starts moving from the starting position for the reading operation,
The number of driving pulses is counted by a counter 96, and when it reaches a predetermined value corresponding to the document size, it is determined that the scanning body 67 has reached the reading end position. When the scanning body 67 passes the reading position, the reading operation of the reading means 42 ends at step n8.

After that, the motor M is driven at a rotational speed higher than the sub-scanning speed. Then, in step n9, it is determined whether the optical scanning body 67 has reached the standby position. Fourth sensor S
When the scanning body 67 is detected by step 4, the processing of the stationary document reading operation ends.

Note that the read original image is transmitted via a telephone line.

In the above-mentioned embodiment, the fact that the scanning body 67 has reached the reading end position is detected by the number of driving pulses and the counter 96. You can. Further, although the above-described embodiments have been described with respect to facsimile machines, the image reading apparatus according to the present invention can also be applied to copying machines.

In this way, in this embodiment, the original moving type reading mechanism 30
Since the document stationary reading mechanism 31 is provided on the downstream side in the document feeding direction, the following effects are achieved.

(2) There is no need to provide the automatic document feeding means 40 above the main body, so the height dimension of the apparatus can be reduced.

(2) The original set cover 23 can be separated from the stationary original reading mechanism 30, so that opening and closing operations of the original setting cover 23 can be facilitated.

(2) A recess 25 which also serves as a document 1-lay in the document moving type reading mechanism can be formed in the document set cover 23, and the apparatus can be simplified.

■It is easy to operate as the original is moved from right to left, and the operating parts such as switches can be placed at the front of the device, allowing you to read the original with your right hand and operate the switches with your left hand. This allows efficient operation.

■Since the document moving type reading mechanism 30 is not provided on three sides of the device, there is no need to bend the document fed by the automatic document feeder 40 from above to bring it into a horizontal state as in the conventional method, and the image of the document can be read. accuracy can be improved.

■Since the stationary original reading operation is given priority over the moving original reading operation, it is possible to prevent paper jams from occurring. In other words, when a document is placed on the stationary document reading section, the document set cover is not necessarily closed, and when a thick document, such as a wooden document, is placed, it may be closed with a gap or protruding from the cover. There are cases. At this time, if the ADF mechanism performs a document moving type reading operation, the document Pa may not be properly ejected to the upper part of the document cellar I/cover, and there is a possibility that a paper jam may occur. However, in this embodiment, priority is given to static reading of the original, so this problem can be solved.

2. As described above, according to the present invention, when there is a document in both the moving document reading mechanism section and the stationary document reading mechanism section, the reading operation of the stationary document reading mechanism section is controlled. Therefore, even if a large number of sheet-like originals such as 50 or 100 sheets are loaded into the moving original reading mechanism, the stationary original reading mechanism, which is used for thick originals such as books, has a long There is no need to wait for a long time, and considering that the number of pages read by the moving original reading mechanism is generally small in the stationary original reading mechanism, it is possible to read the original without having to wait for a long time, which is very rational. It is. Further, in the present invention, since the moving document reading operation is automatically performed after the stationary document reading, it is possible to prevent forgetting to operate a key for the moving document reading operation after the stationary document reading is completed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance of a facsimile 20 to which an image reading device according to the present invention is applied, FIG. 2 is a sectional view taken along the cutting plane line n-n in FIG. FIG. 4 is a block diagram showing the electrical configuration related to the image reading operation, and FIG. 5 shows the main flow for selecting between the moving document reading mode and the stationary document reading mode. FIG. 6 is a flowchart 1. showing the processing of a moving original type reading operation, and FIG. 7 is a flowchart 1. showing the processing of a stationary original type reading operation. 20...Facsimile, 21...Main body, 22...
Manuscript placement plate, 23...Manuscript Seratkahar, 25...
Recess, 30゛...Original moving type reading mechanism, 31...
Original stationary reading mechanism, 32... Transmission section, 33...
Receiver, sl. S2. S3. S4. S'5...Sensor, 42...Optical system reading means, 53...Drive health I, 67...
Optical scanning body, 74... Guide rod, M... Motor, cl
...First electromagnetic clutch, C2...Second electromagnetic clutch, R1...Paper feed roller, R3...Separation roller, R4...Conveyance roller, R6,...Ejection roller . Fig. 6 Usagi swaying type competition” Mamote Fig. 7 R4I pride, pattern spring, J father and son, - to know

Claims (1)

[Claims] (1) An original moving type reading mechanism that moves the original to a predetermined reading position and reads the original image using an optical reading means placed at the reading position; a stationary document reading mechanism that reads the document image by moving a target reading device in the sub-scanning direction, and the optical reading device is configured to be used in both the moving document reading mechanism and the stationary document reading mechanism. An image reading device that is equipped with the following components includes: a start switch for starting an image reading operation; a first sensor that detects when a document is placed in a moving document reading mechanism; a second sensor that detects that the document is set; and a second sensor that detects the document when the first sensor and the second sensor are alternatively detecting the document when the start switch is pressed. On the other hand, when both sensors are detecting a document, the stationary document reading mechanism is activated preferentially to perform a stationary document reading operation, and after the reading operation is completed. An image reading device comprising: control means for automatically operating a document moving type reading mechanism to perform an image reading operation.