JPH01265242A - Image reader - Google Patents

Abstract

PURPOSE:To reduce the dimension in a device height direction and to scale down a reader by providing a document moving type reading mechanism and a document stay type reading mechanism and sharing an optical reading means with them. CONSTITUTION:The document moving type reading mechanism 30 is composed of an automatic document feeding means, a document glass 41 provided in a document reading position E, the optical reading means 42, etc. On the other hand, the document static type reading mechanism 31 is composed of a document set cover 23, a document glass 100 and the optical reading means 42. Namely, the optical reading means 42 serves as reading means for the mechanisms 31 and 30. The document glasses 41 and 100 are on the same height plane. Thus, the height dimension of the reader can be minimized to accomplish the miniaturization of a set. Moreover, the document set cover of the stay type reading mechanism can be separated from the moving type reading mechanism, whereby the weight of the set cover can be reduced to improve operability.

Description

[Detailed Description of the Invention] Lord! The present invention relates to an image reading device applied to a facsimile machine, a copying machine, etc., and more specifically, it is provided with a moving original reading mechanism and a stationary original reading mechanism, and furthermore, the optical reading means is a moving original reading mechanism. The present invention relates to an image reading device that is configured to be used both in a mechanism and a stationary document reading mechanism.

2. Description of the Related Art Conventionally, for example, copying machines can automatically feed single-sheet originals and continuously copy a plurality of sheets, and there has also been a desire to copy thick originals, such as books.

Therefore, a copying machine equipped with a moving original reading mechanism and a stationary original reading mechanism has already been devised.

FIG. 7 is a diagram schematically showing the internal structure of a copying machine to which an image reading device having such a conventional moving original reading mechanism and a stationary original reading mechanism is applied. At the top of the main body of the copying machine 1, there is an ADF (automatic document feed) mechanism 4 that is composed of a document T71i placing plate 2 on which a single-sheet document is placed and a paper feed roller 3 for automatically feeding the document. is provided.

Further, on the right side of the ADF mechanism 4 in FIG. 7, there is provided a document set cover 5 for holding down a document such as a book when reading the document. The ADFi horizontal 4 and the document set cover 5 are integrally formed. Also, ADF
An optical reading means 7 movable in the direction of the arrow 6 is provided below the structure 4 and the document set cover 5. Further, below the optical reading means 7, there is a copying mechanism section 10 including a laser scanning means 9 for scanning the surface of the photoreceptor drum 8 with a laser beam that is optically modulated in accordance with the read original image. It is provided.

The ADF mechanism 4 and the optical reading means 7 constitute a moving original reading mechanism, and the original set cover 5 and the optical reading means 7 constitute a stationary original reading mechanism.

When reading a document by the document moving type reading mechanism, the optical reading means 7 is stopped at the standby position shown by the solid line in FIG. The document image is read by the optical reading means 7 by conveying the document to a document reading position and then feeding the document at a sub-scanning speed. Incidentally, the read original is carried out to the paper discharge tray 11.

When reading a document using the stationary document reading mechanism, the document holding cover 5 is opened, a book is placed on the document placement plate 5a, and the document set cover 5 is closed again.

In this state, the optical reading means 7 moves from the standby position to the scanning start position indicated by the imaginary line, and by moving from the scanning start position in the opposite direction to the arrow 6, the original image of the book is read. .

Note that the read original is recorded on recording paper by the copying mechanism section 10.

In the above prior art, the ADF mechanism 4 and the original set cover 5
Since the document set cover 5 and the document set cover 5 are integrally formed,
It is heavy when opened, and operability is poor. This also causes malfunctions.

Further, in the ADF mechanism 4, it is necessary to ensure a moving path for the document and to keep the document in a horizontal state at the reading position.

Therefore, it is better to insert the original in a horizontal position from the beginning, but if you do this, the original set cover 5 will be placed in the AD position.
It has to be placed away from the F mechanism 4, which increases the lateral length of the device. Therefore, as shown in Figure 7, A
A DF mechanism 4 is provided above the machine body, and the document is configured to be carried in diagonally from above and fed horizontally.

Therefore, the height dimension of the device becomes large. Furthermore, since the original is curved before it reaches the reading position, the original may not be completely horizontal at the reading position, or creases may remain, which makes it difficult to read the original image accurately. I can't.

The purpose of the present invention is to solve the above-mentioned technical problems, to reduce the height dimension of the device, to achieve miniaturization, to have excellent operability, and to improve the reliability of reading accuracy. An object of the present invention is to provide an image reading device that achieves the following.

The present invention provides a document moving type reading mechanism that moves a document to a predetermined reading position and reads a document image by an optical reading means disposed at the reading position; a stationary document reading mechanism that places a document on a document placement plate and reads the document image by moving an optical reading device in the sub-scanning direction; The image reading device configured to be used also as a stationary reading mechanism is characterized in that the stationary original reading mechanism is located downstream of the moving original reading mechanism in the original moving direction.

According to the above configuration, the stationary original reading mechanism is located downstream of the moving original reading mechanism in the original moving direction. Therefore, the size of the apparatus in the height direction can be reduced compared to the conventional apparatus in which the document moving type reading mechanism is disposed above the apparatus, and the size of the apparatus can be reduced.

Figure 1 is a perspective view showing the 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 center cover 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 center 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.

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

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 155 to the transfer unit 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 on the side of the document reading position, an optical reading means 42, and the like. The stationary document reading mechanism 31 also includes a document set cover 23, a document glass 100. and an optical reading means 42. 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 R that transport the original to the original reading position.
4 and R5, and a pair of ejection rollers R6 and R7 for ejecting the original after reading has been completed. Roller R4, R6
is a driving roller, and rollers R3, R5, and R7 are driven rollers. The rotational axes of these rollers R1 to R7 are all parallel.

A first electromagnetic clutch C is coaxially connected to the rotating shaft of the roller R1.
1, 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.
An auxiliary pulley 52 is provided between the pulleys 46 and 48. These pulleys 46, 52° 48.50.
An endless timing belt 53 is wound around a pulley M1 fixed to the drive motor M and the output shaft of the drive motor M. Note that the motor M is capable of forward and reverse rotation, and is realized by, for example, a stepping motor. This motor M
A document moving type reading operation and a document stationary type reading operation are executed by forward/reverse rotation of the original and by turning on/off the electromagnetic clutches CI and C2.

The optical reading means 42 includes an optical scanning body 67 movable in the direction of an arrow 66, and a photoelectric conversion element realized by mirrors 62, 63, a condensing lens 64, a CCD, etc. housed in the optical scanning body 67. 65, a pair of light sources 60, 61 attached to the upper surface of the optical scanning body 67, and a mirror 68.
．． 69. By providing the pair of light sources 60 and 61 in this manner, image reading accuracy can be improved. The optical scanning body 67 also includes a flexible cable 70 for extracting electrical signals from the photoelectric conversion element 65.
is installed. When reading an image, light from a light source 60.61 is irradiated onto the original image, and the reflected light is guided to a mirror 63 through a slit 71, and then to a photoelectric conversion element 65 through a mirror 62 and a condensing lens 64. imaged.

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 longitudinal end of the optical scanning body 67, 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, an upper part of a timing belt 77 is fixed to the optical scanning body 67, and this timing belt 77 is attached to pulleys 78° and 79°.
is wrapped around. The rotation shaft 80 of the pulley 79 has
The electromagnetic clutch-equipped pulley 51 is coaxially fixed. Therefore, when the rotational driving force of the boolean IJ 51 is transmitted to the pulley 79 via the electromagnetic clutch C2, the optical scanning body 67 can move 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 100, and S3 is a third sensor that detects that the leading edge and trailing edge 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 5l-3
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. In addition, the operation signals from the mode switching key 1 for switching between the moving document reading mode and the stationary document reading mode, the reading start key 2, and the document size specifying key 3 for specifying the document size during stationary document reading are as follows.
It is given to CPU90. Furthermore, it is provided to a counter 96 within the CPU 90. The CPU 90 controls the motor drive circuit 91 based on these detection signals, operation signals, and pulse signals.
, outputs control signals to the clutch drive circuit 92 for the electromagnetic clutch CI and the clutch drive circuit 93 for the electromagnetic clutch C2 to control forward/reverse rotation and stop of the motor M, and further control on/off of the electromagnetic clutches C1 and C2. .

FIG. 5 is a flowchart showing the processing procedure of the document moving type reading operation. Press 1 on the mode switching key to set the original moving type reading mode. As a result, the process shown in FIG. 5 is executed. In the initial state, the optical reading means 42 is stopped at the standby position shown by the solid line in FIG. First, in step m1, a single-sheet original P is placed on the original placing plate 22.
It is determined whether or not a is set. When it is detected by the first sensor S1 that the document Pa has been placed, the process moves to step m2, and it is determined whether or not the start key has been pressed.

When operated, the process moves to step m3, and the drive state A shown in Table 1 is set. 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, and R6 are rotationally driven in the normal rotation direction. Note that since the electromagnetic clutch C2 is in the off state, the pulley 51 is not rotationally driven, and therefore the optical scanning body 67
remains stopped at the standby position. The rotation of the roller R1 causes the paper feed belt 45 to rotate in the direction of the arrow, so that 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 separation roller R3, only the lowest document Pa among the plurality of documents Pa is fed, and conveyance rollers R4 and R
Supplied within 5 days. The document Pa is then conveyed toward the document reading position.

Then, in step m4, 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 E, a detection signal from the third sensor S3 is given to the CPU 90, and the process moves to step S5, where the motor M is stopped and the electromagnetic clutch C1 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.

[Margin below]

Table 2 and step m6 instruct the optical reading means 42 to perform a reading operation. As a result, the light source 60 of the reading means 42
．． 61 is driven to emit light. At the same time, step m
At step 7, the motor M is again driven in normal rotation. Furthermore, electromagnetic clutch C
I and C2 remain in the off state, resulting in the driving state DB 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 belt 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 m8 whether or not the trailing edge of the document pa has reached the document reading position E, and the third sensor S3 detects whether or not the document pa has reached the document reading position E.
When the rear end is detected, the process moves to step m9, the reading operation of the optical reading means 42 is stopped, and the process moves to step mlo.
At this point, motor M stops rotating. As a result, roller R1
, R4, and R6 stop rotating as shown in Table 2. Then, in step m11, 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, the roller R1 remains stopped, and the rollers R4 and R6 are rotated in the normal rotation direction. As a result, a document discharge operation is performed, and the document Pa after image reading is discharged into the recess 25. Then, in step m11, it is determined whether or not there is a next document Pa. If the first sensor S1 detects that the document Pa does not exist, the process ends; if the document Pa exists, the process returns to step m3. . Then, the closed loop processing from step m3 to step mll is performed for the number of original documents, and when the reading operation of the last original Pa is completed, all the processing is completed.

FIG. 6 is a flowchart showing the processing of the stationary document reading operation. Press 1 on the mode switching key to set the document stationary reading mode. As a result, the process shown in FIG. 6 is executed. In the initial state, the optical reading means 42 is stopped at a standby position. Then, in step n1, it is determined whether or not a document is set. When setting a document, open the document set cover 23 and place the document Pb, such as a thick book, on the document glass 100.
Thereafter, the document set cover 23 is closed so that the document Pb is brought into close contact with the document glass 100. When the original Pb is set on such original glass 100,
This is detected by the second sensor S2, and the process then moves from step n1 to step n2. In step n2, press 3 on the document size designation key to select the document P.
It is determined whether or not the bO size has been specified, and if it has been specified, the distance from the scanning start position to the document reading end position, which will be described later, is stored in the memory within the CPU 90. Then, the process moves to step n3, and it is determined whether or not the start key has been pressed.If the start key has been pressed, the process moves to step n4, and the driving state Bc shown in Table 1 is set. That is, the motor M is driven to rotate normally as shown in Table 1, the electromagnetic clutch CI is in the off state, and the electromagnetic clutch C2 is in the on state. As a result, the pulley 79 is rotationally driven in the normal rotation direction, and the optical scanning body 67 moves along the guide rod 74 in the direction of the arrow 66a. Then, the optical scanning body 67
It is determined in step n5 whether the starting position indicated by the virtual line in the figure has been reached, and when the starting position has been reached, the process moves to step n6 and the rotation of the motor M is stopped. Then, in step n7, the optical scanning means 42 is instructed to start reading, and the light source 60
61 is driven to emit light.

Then, in step n8, 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. As a result, the pulley 79 is rotationally driven in the reverse direction, so that the optical scanning means 67 moves in the direction of 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 due to the action of 7.49. 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 ejection operation of the document Pb is completed during the period until the time reaches . However, if the motor M rotates in the reverse direction when the document is not completely ejected, the rollers R4 and R6 will rotate in the reverse direction if the one-way clutch 47, 49 is not provided.
The original Pb flows backward into the original moving type reading mechanism and is not ejected. In this embodiment, one-way clutch 47.
By providing 49, it is possible to prevent the rollers R4 and R6 from rotating in the reverse direction, thereby preventing the occurrence of a defective ejection operation.

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 n9, 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,
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 means 42
The read operation ends at step nlo.

After that, the motor M is driven at a rotational speed higher than the sub-scanning speed. Then, in step nil, it is determined whether the optical scanning body 67 has reached the standby position. When the scanning body 67 is detected by the fourth sensor S4, the processing of the stationary document reading operation is completed.

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

In the above-described embodiment, the counter 96 detects when the scanning body 67 reaches the reading end position, but the scanning body 67 may be provided with a separate optical sensor and the detection may be performed by this sensor. 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 document set cover 23 can be separated from the stationary document reading mechanism 30, so that opening and closing operations of the document set cover 23 can be facilitated.

■A recess 25 can be formed in the document set cover 23, which also serves as a document tray in the document moving type reading mechanism.
The device can be simplified.

■It is easy to operate because the original is set from right to left, and the operating parts such as switches can be placed at the front of the device, making it possible to insert the original with the right hand and operate the switches with the left hand. Able to perform efficient operations.

■Since the document moving type reading mechanism 30 is not provided above the device, there is no need to bend the document fed by the automatic document feeder 40 from above to make it horizontal as in the conventional case, and it is possible to read the image of the document. Accuracy can be improved.

According to the present invention, as described above, in order to arrange the stationary original reading mechanism downstream of the moving original reading mechanism in the original moving direction, the moving original reading mechanism is placed above the main body of the apparatus. There is no need to provide one, so the height dimension of the device can be reduced, and the device can be made smaller. In addition, this configuration makes it possible to separate the document set cover used in the stationary document reading mechanism from the moving document reading mechanism, reducing the weight of the document set cover. The operability of opening and closing operations can be improved.

In addition, there is no need to provide a moving original reading mechanism above the device, and therefore, unlike conventional moving original reading mechanisms, there is no need for a transport path that bends horizontally from above. Furthermore, since there are no folding marks, it is possible to read an accurate document image.

[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, FIG. 5 is a flowchart showing the processing of the moving document reading operation, and FIG. 6 is the stationary document reading operation. A flowchart showing the operation process, and FIG. 7 is a cross-sectional view showing the internal structure of the prior art. 20...Facsimile, 21...Main body, 22...
Original placement plate, 23... Original set cover, 25...
Recess, 30... Original moving type reading mechanism, 31... Original stationary type reading mechanism, 32... Transmitting section, 33... Receiving section, Sl. S2. S3. S4. S5...Sensor, 42...Optical system reading means, 53.77...Timing belt, 6
7... Optical scanning body, 74... Guide rod, 79... Pulley, 90... CPU, M... Motor, C1...
First electromagnetic clutch, C2... second electromagnetic clutch,
R1...Paper feed roller, R3...Separation roller, R4...
...Conveyance roller, R6...Discharge roller. Patent applicant 2 Murata Machinery Co., Ltd. Figure 1 Figure 7

Claims (1)

[Scope of Claims] 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, and a document that places the document on a document placement plate. a stationary document reading mechanism for reading a document image by moving an optical reading device in the sub-scanning direction; 1. An image reading device configured as described above, wherein the stationary original reading mechanism is located downstream of the moving original reading mechanism in the original moving direction.