JP3179525B2 - Image reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus which conveys an original and optically reads the original.

[0002]

2. Description of the Related Art Some image reading apparatuses, so-called scanners, convey an original to its original reading point and optically read both sides of the original at the same time. This type of scanner has a front side reading unit in the lower unit, a back side reading unit in the upper unit, conveys the document and reads the image at the optical reading point, and mirrors mounted on the upper and lower units,
It is processed by a camera, CCD, control board and the like.

[0003]

However, in the above-mentioned prior art, a single-sided reader may be required instead of a double-sided reader, and the type of parts must be changed corresponding to both the readers. Many types of parts must be prepared, which increases development costs. Also, during maintenance, service costs increase, for example, by preparing front and back side reading control boards. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made to solve the problem. The object of the present invention is to provide a scanner for single-sided reading and a scanner for double-sided reading, without requiring a change in the type of parts, reducing maintenance costs and Another object of the present invention is to provide an image reading apparatus capable of reducing development costs and extending single-sided reading to double-sided reading.

[0004]

To SUMMARY OF THE INVENTION To achieve the above object, the present invention is an image reading apparatus that simultaneously light reading both sides of a document has a document table, a document placing
Fluorescent light, camera, C for optically reading one side of the document on the table
CD, CCD control board, AD conversion board, image data
Lower unit with a scanner consisting of a processing board
And supported openably and closably with respect to the lower unit,
Same fluorescent light, camera, CCD, CCD as in lower unit
Control board, AD conversion board, image data processing board
Scanner is installed and said scanner
Upper unit for optically reading the other side of the document on the document table
The image data processing board has master / slave switching.
This is the first means provided with a switch . According to another aspect of the present invention, there is provided an image reading apparatus which optically reads both sides of a document at the same time , comprising a document placing table,
A lower unit with a scanner that optically reads one side of the upper original
The knit and the lower unit are supported so that they can be opened and closed.
A scanner for optically reading the other side of the original on the original placing table.
Includes an upper unit was installed scanners, by removing the two support plates for supporting the shaft rotatably supporting the on Yunitsuto, there was the on Yunitsuto the second means so as Hazuseru from the lower Yunitsuto .

[0005]

An image data processing board is provided by the first means.
Is equipped with a master-slave switching switch.
In addition, one type of board is used for both front side reading and back side reading
Can also be changed. By the second means, the scanner for single-sided reading can be easily expanded to the scanner for double-sided reading simply by replacing the upper unit.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing an appearance of an embodiment of the present invention, FIG. 2 is a diagram showing a state in which a back side reading unit (duplex) of the embodiment of the present invention is opened, and FIG. 3 is a schematic configuration of the embodiment of the present invention. FIG. 4 is an explanatory view showing a drive system of a roller according to the embodiment of the present invention, FIG. 5 is an explanatory view showing a portion from a call roller to a conveying roller according to the embodiment of the present invention, and FIG. Exploded perspective view of a transport unit portion of the embodiment of FIG.
FIG. 7 is a diagram showing an optical reading unit according to an embodiment of the present invention.
FIG. 8 is a diagram showing a hinge portion of a base plate according to the embodiment of the present invention. FIG.
10A and 10B are a front view and a side view showing a mounting portion of the upper unit, FIGS. 11A and 11B are a side view and a plan view of the base plate, and FIG. 13A and 13B are a plan view and a front view of a first mirror bracket, FIGS. 13A and 13B are a plan view and a front view of a second mirror bracket, and FIG. , FIG. 15 is a diagram illustrating a board configuration in a double-sided reader, and FIG. 16 is a diagram illustrating a connection state of the board.

In FIG. 3, reference numeral 10 denotes a double-sided simultaneous reading scanner. The scanner 10 has a lower unit 11 having a front side reading unit for an original and an upper unit having a back side reading unit which is attached to the lower unit 11 so as to be freely opened and closed. And a unit 12. Reference numeral 13 denotes a document table provided on the upper surface of the lower unit 11, reference numeral 14 denotes a call roller, and the shaft of the call roller 14 is connected to a motor (not shown) via a torque limiter. A small roller (not shown) extending in the direction is supported, and the rotation of the shaft is transmitted through a gear (not shown) so that the small roller is rotated in the same direction as the call roller 14. It is. Accordingly, when the motor is driven, the call roller 14 rotates in the counterclockwise direction (FIG. 3). The original is fed into the retrieving roller 14 by the rotation of the small roller. Presser spring 15
The document inserted between the feed roller 14 and the call roller 14 is conveyed by the rotation of the call roller 14 to a feed roller 16 and a separation roller 17 provided on the upper unit 12 side. The original is separated by the separation roller 17 and the feed roller 16 and
Only the sheet is conveyed and reaches the first pressure rollers 18a and 18b. Downstream of the first pressure rollers 18a and 18b, second pressure rollers 19a and 19b are provided. Between the two rollers, fluorescent lamps 20a and 20b as light sources and glass plates 21a and 21b are provided. Are arranged. In addition, the suffix “a” of each code is the lower unit 11 side, and “b” is the upper unit 1
It is provided on two sides. As mentioned above,
The document conveyed to the pressure rollers 18a, 18b is further conveyed to the left by the rotation of the first pressure rollers 18a, 18b, and passes through the glass plates 21a, 21b to the second pressure roller. 19a and 19b, and the second pressure roller 19
The document is discharged to the tray 22 by the rotation of the a and 19b. Reference numeral 62 denotes a document detection sensor.

The light of the fluorescent lamp 20a passes through the glass plate 21a and irradiates the original, and the reflected light is guided to the camera 24 via the mirror 23 to read the light. The mirror 23 and the camera 24 are connected to the base plate 2 as shown in FIG.
5 attached. The base plate 25 is composed of a first base plate 26 and a second base plate 27, and both the first base plate 26 and the second base plate 27 have a thickness of 1.6 m.
m, and both are spot welded and integrated. Also, the first base plate 26
, A first mirror holder 28 and a second mirror holder 29, both made of a zinc-treated steel sheet having a thickness of 1.6 mm, are spot-welded. The first mirror holder 28 and the second mirror holder 29 are bent and formed in an L shape as shown in FIGS. 12A and 12B and FIGS. 13A and 13B, respectively. Substantially rectangular holes 28a and 29a into which one ends of the 23 are inserted are formed, and insertion pieces 28b and 29b inserted into the opening 26a of the first base plate 26 extend downward. Also, arc-shaped pieces 28c, 29c are provided on one side of the holes 28a, 29a.
The mirror 23 inserted into each of the holes 28a, 29a is pressed and fixed by the spring force of the arcuate pieces 28c, 29c.

On the other hand, the camera 24 is fixed to the screw holes 30a provided on the other end of the base plate 25 with screws. The other end of the base plate 25 is bent downward, and an opening 31 is provided so that the rigidity of the base plate 25 is, for example, about half that of the other parts, so that the base plate 25 is easily bent. Further, the lower end bent downward is further bent to form a narrow mounting piece 32, which has a hole 33 for screwing to the main body bottom plate. The other end of the base plate 25 has a CCD control (carrier) board 1
01a and an EQ / DITHER board 103a having A / D conversion, shading correction, and dither output functions.

On the other hand, the first base plate 26 of the base plate 25
Is provided with a main reference hole 36 at one end, and an elongated sub reference hole 37 at the other end. By fitting a positioning pin (not shown) caulked on a side plate into the main reference hole 36 and the sub reference hole 37, the optical reading unit including the base plate 25 and the like is positioned. Further, holes 38 for inserting screws for fixing the base plate 25 to the side plates are formed at both ends of the first base plate 26.

The above-mentioned upper unit 12 also has the lower unit 1
1, a reading unit is provided, and the light of the fluorescent lamp 20b is transmitted through the glass plate 21b and irradiated on the back side of the original, and the reflected light is reflected by the first mirror 39 and the second mirror 4
0, the light is guided by a camera 42 via a third mirror 41 to perform optical reading. As shown in FIGS. 10A and 10B, the upper unit 12 has both side plates 4 of the upper unit 12.
A support shaft 44 is stretched on 3, and an end of the support shaft 44 is inserted into a shaft hole 46 of a support plate 45. A lower portion of the support plate 45 is bent into an L shape to form a mounting portion 47, and a hole 49 through which a screw 48 is inserted is formed in the mounting portion 47. The support plate 45 is fixed to the lower unit 11 by inserting the screw 48 into the hole 49 and screwing it into the screw hole of the side plate 50 of the lower unit 11, and the upper unit 12 is centered on the support shaft 44. It is opened and closed.

Therefore, since the upper unit 12 can be easily removed by removing the screw 48, the upper unit 51 for a single-sided reader having no reading unit can be attached to the lower unit 11. Conversely, a scanner for single-sided reading can be easily extended to a scanner for double-sided reading.

FIG. 4 shows a drive system for the first pressure roller 18a and the second pressure roller 19a on the lower unit 11 side, and pulleys 52, 53 fixed to the shafts of the rollers 18a, 19a.
Then, a belt 61 is wound from a pulley 54 of a motor 60 via an idler pulley 55, so that both rollers 18a, 19a are rotated in the same direction. A first pressure roller 18b and a second pressure roller 19b on the upper unit 12 side are pressed against the respective rollers 18a, 19a by compression coil springs 56, 56 as shown in FIG. . A gear 57 is attached to the shaft of the first pressure roller 18a, and the gear 57 is meshed with a gear 59 fixed to the shaft of the feed roller 16 via an intermediate gear 58. Therefore, the first
The rotation of the pressure roller 18a is transmitted via each of the gears 57 to 59, and the feed roller 16 is also rotated in the same direction.

FIG. 14 shows a board configuration of a one-sided reader. As described above, the reflected light of the line at the light reading point of the document is imaged on the CCD 100 in the camera 23 via the mirror 23. The CCD 100 is mounted on a CCD carrier board 101, and analog signals are input to a 5K CCD board 102. The 5K CCD board 102 performs CCD control, such as a clock generator, image output amplification, impedance conversion, and dark output clamp. Then, a signal is output to the EQ / DITHER port 103. In the EQ / DITHER port 103, image output A / D conversion, shading correction, dither output, and the like are performed. The output of this board 103 is output to the PAGS-1000 board 104 as a digital signal. In this board 104, engine control (paper conveyance, image data reading), host I / F control (RS232C port input / output,
Command analysis / execution), image data processing (skip /
Control, edge detection). 105 is C
On the GVS board, image data compressed image data memory (F
IFO) and a host I / F (SCSI board I / F). A SCSI board 106 is a SCSI controller. Reference numeral 107 denotes an OPCON board for driving a scanner status display, detecting consumables replacement, transmitting a scanner hardware test command, and controlling a fluorescent lamp heater. Reference numeral 108 denotes an OPLED board for displaying a scanner status display and consumables replacement detection. Is performed, and 109 is E
The page count value is stored in the EPROM board.

FIG. 15 shows a board configuration of a double-sided reader.
Imaged above. Note that the same boards as the boards shown in FIG. 14 are denoted by the same reference numerals, and the front side is given the suffix “a” and the back side is given the suffix “b”. 104a is the main PAG
S1000 board, slave PAGS1000 board 104
b is controlled. Reference numeral 110 denotes a GVS-09 board for switching between front and rear image data, and 112 denotes a GVS-01 board for image data memory (FIF).
O) Perform host I / F. The PSU shown in FIG.
Reference numeral 111 denotes a multiple power supply of an automatic input switching system. FIG.
Each board shown in FIG. 3 is connected to the lower unit 1 as shown in FIG.
1. Installed on the upper unit 12.

A dip switch (not shown) is provided on the main PAGS 1000 board 104a of the double-sided reader, and the board is set as the main or subordinate by switching the dip switch. Therefore, in the past, it was necessary to separate the front side reading board and the back side reading board in order to determine the master / slave, but by switching the depth switch, one type of board can be used for both the front side reading and the back side reading. The number of parts to be prepared as maintenance parts can be reduced. Also, the number of types of boards is reduced in manufacturing, so that management costs and the like can be reduced, and costs can be reduced.

In the embodiment, the upper unit 12 is supported so as to be openable and closable, and the same fluorescent lamp, camera, CCD, CCD control board, AD conversion board, image Since the data processing board is installed, there is no need to change the type of parts between the scanner for single-sided reading and the scanner for double-sided reading.
Service costs and development costs are lower than before. In addition, since a master-slave switching switch is installed on the image data processing board, it is necessary to distinguish between master and slave.
Conventionally, the engine control board was separated for front side reading and back side reading, but anyone can easily switch one type of board for front side reading and back side reading by switching the dip switch on the control board Therefore, fewer parts need to be prepared as maintenance parts. In addition, since the types of boards are reduced in manufacturing, management costs and the like can be saved, and costs can be reduced. Also, by removing the two support plates 45, 45 that support the shaft 44 that rotatably supports the upper unit 12, the upper unit 12 is removed.
Can be detached from the lower unit 11, so that the scanner for single-sided reading can be easily expanded to the scanner for double-sided reading.

[0018]

As described above, according to the first aspect of the present invention, the necessity of discriminating between the master and the slave causes the engine control to be stopped.
Conventionally, separate the board for front side reading and back side reading.
The master / slave switching of the image data processing board
By switching the switch, anyone can easily set
Image data processing board for front side reading and back side reading
Can be changed, so the parts to be prepared as maintenance parts
And the type of board used in manufacturing
As a result, management costs can be saved and costs can be reduced.
You. According to the second aspect of the invention, the scanner for single-sided reading can be easily expanded to the scanner for double-sided reading.

[Brief description of the drawings]

FIG. 1 is a diagram showing the appearance of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which a back side reading unit (duplex) is opened according to the embodiment of the present invention.

FIG. 3 is a sectional view showing a schematic configuration of an embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a roller drive system according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a portion from a call roller to a transport roller according to the embodiment of the present invention.

FIG. 6 is an exploded perspective view of a transport unit according to the embodiment of the present invention.

FIG. 7 is a diagram showing an optical reading unit according to an embodiment of the present invention.

FIG. 8 is a view showing a hinge portion of the base plate according to the embodiment of the present invention.

FIG. 9 is an explanatory view of a single-sided reader according to the embodiment of the present invention.

FIG. 10 is an explanatory view showing a mounting portion of the upper unit.

FIG. 11 is an explanatory diagram of a base plate.

FIG. 12 is an explanatory diagram of a first mirror bracket.

FIG. 13 is an explanatory diagram of a second mirror bracket.

FIG. 14 is a diagram illustrating a board configuration in a single-sided reader.

FIG. 15 is a diagram showing a board configuration in the duplex reader.

FIG. 16 is a diagram showing a connection state of a board.

[Explanation of symbols]

 11 Lower unit 12 Upper unit 20a, 20b Fluorescent lamp 24, 40 Camera 100a, 100b, CCD 101a, 101b CCD carrier board

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukitoshi Kitani 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Nobutaka Suzuki 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Takeyuki Iijima 1-3-6 Nakamagome, Ota-ku, Tokyo Tokyo, Japan Inventor Ritsuko Mitsutani Mitsutoshi 1-3-6 Nakamagome, Ota-ku, Tokyo No. In Ricoh Co., Ltd. (56) References JP-A-2-20958 (JP, A) JP-A-3-94868 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 1/04-1/207

Claims (2)

(57) [Claims] 1. An image reading apparatus in which both sides of a document are optically read at the same time, the apparatus comprises a document table, and optically reads one side of the document on the document table.
, Fluorescent light, camera, CCD, CCD control board, A
Scanner consisting of D conversion board and image data processing board
A lower unit in which the lower unit is installed, and the lower unit is supported so as to be openable and closable with respect to the lower unit.
Same fluorescent light, camera, CCD, CCD control as in the nit
Board, AD conversion board, image data processing board
Scanner is installed, and the original is scanned by the scanner.
An upper unit for optically reading the other side of the original on the mounting table.
A master / slave switching switch is provided on each of the image data processing boards.
An image reading device characterized by being installed . 2. An image reading apparatus for reading both sides of a document by light at the same time , comprising a document placing table, wherein one side of the document on said document placing table is optically read.
A lower unit set up scanner for reading, can be opened and closed supported relative to the lower unit, the document
A scanner for optically reading the other side of the original on the mounting table is installed.
Includes an upper unit with location, by removing the two support plates for supporting the shaft that supports the on Yunitsuto rotatably, image reading apparatus, characterized in that the on Yunitsuto was so Hazuseru from the lower Yunitsuto.