JPH01293757A - Picture input device and its rear side reading unit - Google Patents

Abstract

PURPOSE:To expand the function of a body device having a single side automatic reading unit and to prevent the rise of the cost of the device by additionally providing a rear side reading unit for the body device when it is necessary to read both sides of a cutform original. CONSTITUTION:When the single side of an original P is automatically read by an automatic reading unit 5 of a body device 1, information on the lower side of the form to pass through a form passage 27 is read by a reading head 9. On the other hand, when it is necessary to read the both sides of the original, a rear side reading unit 28 is installed instead of a form ejecting tray, and the detached form ejecting tray 8 is installed in the unit 28. Further, a control part 21 of the device starts the reading operation of the unit 28 when the control part 21 detects that the reading at the unit 5 ends. Namely, the driving motor of the unit 28 is rotated based on a reading end signal at the unit 5, the form on a guiding plate 40 is taken in, a reading head 37 is actuated, and the picture information on the upper side of the original P is read.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an image input device used to read image information recorded on paper, and relates to a device for reading both the front and back sides of paper. It is.

(Prior Art) Image input devices that have been commonly used in the past have a structure that reads only one side of a document. Therefore, when inputting image information on both the front and back sides, it is necessary to read one side and then turn the ejected document upside down. It is necessary to insert the tube into the device again.

When reading both sides of a large number of documents, such a task is complicated, so a double-sided automatic reading unit 53 having a structure as shown in FIG. 5 is used. In the same figure,
46 is an automatic paper feeder, 47 is a document placed ia on the automatic paper feeder, 48 is a paper path, 49 is a front side reading head, 50 is a back side reading head, 51 is a paper output tray, 52
. . are paper feed roller devices arranged in the paper path 48 at predetermined intervals.

In the conventional apparatus shown in FIG. 5, the front side of the document 47 fed from the automatic paper feeder 46 is read by the front side reading head 49, and the back side of the document 47 is read by the back side reading head 50 disposed downstream. paper path 48
is a horizontal U-shaped path through which the original document 47 is turned upside down and discharged to the paper discharge tray 51. Reference numeral 3 denotes a flatbed type reading stand, and a backside reading head 50 is configured using a reflecting mirror 12, 13, an imaging lens 14, and an image sensor 15 for reading the original on the reading stand 3.

(Problems with the Prior Art) There are not many users who need to read both sides of a document using the automatic double-sided reading unit 53 as described above. Therefore, for users who only need one-sided reading,
It is necessary to separately design and manufacture a single-sided automatic reading unit, which has the drawback of increasing design and manufacturing costs. Also,
When a user using a single-sided automatic reading unit needs to read both sides, he or she must buy a new device, which is uneconomical.

Furthermore, since the document 47 passing through the paper path 48 is read simultaneously by the front and back side reading heads 49 and 50, control is such that the data read by the back side reading head 50 is temporarily stored in a page buffer and transferred after the front side reading operation is completed. is required, increasing equipment cost. Furthermore, in the apparatus shown in FIG. 5, since the paper path is bent in a U-shape, resistance to paper passage is large, increasing the risk of paper jamming.

An object of the present invention is to provide a double-sided automatic reading means for image information that does not have the above-mentioned problems.

(Means for Solving the Problems) The present invention solves the above problems by adopting a structure in which a back side automatic reading unit 28 is attached to a main unit equipped with a single side automatic reading unit 5 to perform double-sided reading. ing. The back side reading unit 28 is equipped with a substantially horizontal guide plate 40 on the upstream side of the paper feed port 30, and the paper ejection tray engagement portion of the main unit is secured to the paper output tray engagement portion of the main unit using the attachment tools 41 and 42 provided at the tip of the guide plate. It is attached and attached to 25 and 26.

Downstream of the guide plate 40 there are roller devices 33, 34 forming a substantially horizontal paper path 32 and a drive device 3 for the roller devices.
5, and a reading plate 37 is arranged on one side of the paper path 32.

The reading head 37 is arranged on the side opposite to the reading head 37 and the paper path 32 on the main body side.

The image input device is constructed by installing the back side automatic reading unit 28 of the above structure in place of the paper discharge tray of the main device. The main device 1 has a single-sided automatic reading unit 5 and a flatbed type reading stand 3 made of a transparent flat plate, and the automatic reading unit 5 is arranged adjacent to the reading area of the flatbed type reading stand 3.

The automatic reading unit 5 has a structure in which a reading head 9 in a fixed position reads the paper passing from the reading platform 3 side to the paper output tray 8 side on the side of the apparatus, and also detects the edge of the passing paper and aligns it. A sensor 22 is provided to detect the end of the original reading operation. A control means 21 is provided which receives a reading end signal from the main unit l and gives a reading start command to the back side reading unit.
The back side reading unit 28 starts a reading operation based on the command.

(Function) When it is necessary to read both sides of a document, the back side reading unit 28 shown in FIG. 2 is installed in place of the paper output tray 8 of the main unit shown in FIG. Attach to the bracket 43 of the paper ejection port 31 (
Figure 1). During automatic reading, the document on the document table 7 installed above the flatbed type reading platform 3 is
6 is separated and supplied to a pair of line feed rollers 17. The supplied original is sequentially nipped and transported by a pair of line feed rollers 17 and a pair of discharge rollers 18, and as it passes through the original reading section A, the image information on the original is transferred to the reading unit 9.
It is read in.

The leading edge of the document P sent out from the automatic reading unit 5 on the main body side collides with the nip portion of the upstream roller device 33 of the back side reading unit 28, and since the roller device is stopped, the leading edge of the document P is sent out from the automatic reading unit 5 on the main body side. It bends upward in the space of.

After the sensor 22 (FIG. 3) of the main unit 5 detects the trailing edge of the document, the end of the reading operation in the main unit 5 is detected by the number of pulses applied to the drive motor 19 of the roller pair 17 and 18. . After receiving this detection signal, the controller 21 gives a reading start command to the back side reading unit 28, and the rollers 33, 34 rotate and the main body side unit 5
The original P, which is waiting in a bent state between the back side reading unit 28 and the back side reading unit 28, is drawn into the back side reading unit 28.

The controller 39 of the back side reading unit 28 is connected to the sensor 38
The drive motor 35 receives the paper detection signal from (Fig. 2).
At the same time, the reading head 37 is operated to read the image information on the back side of the document P. The document whose back side has been read by the back side reading unit 28 is ejected to the paper ejection tray 8. The end of the reading operation in the back side reading unit 28 is detected by the number of pulses given to the drive morph 35 after the sensor 38 detects the trailing edge of the sheet, and then a reading start command is given to the automatic reading unit 5 on the main body side.

Even if the back side reading unit 28 is not provided with the paper end detection sensor 38, the vertical dimension of the document can be detected by the sensor 22 of the main unit 5, so the end of the reading operation by the back side reading unit 28 can be detected. In Although,
It goes without saying that it is safer to provide the paper end detection sensor 38 in the back side reading unit 28 as well.

It is also possible to arrange a sensor 38 immediately before the reading section B of the back side reading unit 28, and to feed the leading edge of the document to the position of this sensor 38 in advance before the reading operation of the main body side unit 5 is completed. By doing so, it is possible to shorten the time required for receiving and transferring documents between the main unit 5 and the back side reading unit 28.

(Embodiment) FIGS. 1 to 4 show an embodiment of the present invention. In FIG. 3, which shows a sectional view of the main part of the main device,
1 is a flatbed type reader that serves as the main device, 2
1 is a frame of the device 1, 3 is a flatbed type reading stand, 4 is a document holding plate, 5 is a single-sided automatic reading unit fixed to one side edge of the document holding plate 4, 6 is a frame of the unit 5, and 7 is a frame 6 8 is a removable paper ejection tray. The device 1 includes a reading stand 3
A reading head 9 is provided which runs along the underside of the
An original illuminated with light S1O is projected onto an image sensor 15 at a fixed position via an optical system consisting of reflecting mirrors 11, 12, 13 and an imaging lens 14, and is read. When reading on the reading table 3, the surface of the document is scanned by the above-mentioned traveling operation of the reading hood 9, and when reading automatically,
The reading head 9 is fixed at a fixed position, and the surface of the document is scanned by moving the document from the document table 7 toward the discharge tray 8 .

16 is a paper feed pair mounted on the frame 6 of the main unit, 17 is a line feed roller pair, 18 is a discharge roller pair, 19 is a drive motor for which paper feed and roller pair, 20 is a timing belt, and 21 is a drive motor for each pair of rollers. A controller 22 controls the rotation stop of the drive motor 19, and a sensor 22 is provided between the paper feed pair 16 and the line feed roller pair 17 and detects the edge of the paper. The timing belt 20 is wound between the drive rollers of the line feed roller pair 17 and the discharge roller pair 18 and the motor 19,
The pair of line feed rollers 17 and the pair of discharge rollers 18 are driven synchronously. The paper feed pair 16 is driven by a drive roller of a line feed roller pair 17 via a gear train (not shown). A clutch is interposed in this gear train as necessary.

FIG. 4 is a perspective view showing the mounting structure of the paper output tray 8 on the main unit 1, in which 23 is a bracket protruding below the paper output port 24 of the main unit 1, and 25 and 26 are the bases of the paper output tray 8. Among the pins fixed to the ends, the negative pin 25 has an hourglass shape and prevents the tray 8 from shifting in the lateral direction when it is engaged with the bracket 23.

When automatically reading one side of a document on the main unit 5,
The information on the bottom of the paper passing through the paper path 27 is read by the reading head 9, and the read paper is delivered to the paper output tray 8.
is discharged.

FIG. 2 is a sectional view showing the back side reading unit. In the figure, 29 is a frame of the back side reading unit 28, 30 is a paper feed port provided in the frame 28, 31 is a paper ejection port, and 32 is a sectional view showing the back side reading unit.
33.34 is a roller device disposed in the paper path 32; 35 is a drive motor for the roller device; and 36 is a roller device 33.34. 37 is a reading head provided above the paper path, 38 is a sensor placed at the end of document reading section B, and 39 is a controller. It is. 40 is a guide plate extending substantially horizontally from the paper feed port 30, and 41.42 is a pin provided at the tip of the guide plate, which is formed in the same shape as the pin 25.26 of the paper discharge tray 8. There is. 43
is a bracket protruding below the paper discharge port 31, and is provided in the same shape and at the same height as the bracket 23 of the main unit.

When it is necessary to read both sides of a document, as shown in FIG. 1, the back side reading unit 28 is installed in place of the paper output tray 8 of the main device, and the paper output tray 8 is attached to the bracket 43 of the back side reading unit 28. . Then, when the controller 21 of the zero body detects that the main unit 5 has finished reading, the back side reading unit 28 starts the reading operation. That is, based on the reading end signal from the main body side unit 5, the drive motor 35 of the back side reading unit 2B is rotated to feed the paper on the guide plate 40 to the reading section, and the head 37 is operated to capture the image of the top surface of the original P. Read the information.

(Effects of the Invention) As described above, according to the present invention, when double-sided reading of a cut document is required, a back-side reading unit is attached in place of the paper output tray of the main unit having a single-side automatic reading unit. Since double-sided automatic reading can be performed with this simple operation, the functions of the main device can be expanded, and an increase in the cost of the main device can be prevented. Furthermore, the image input device of the present invention bends and waits the document passing through the paper path in a space formed between the main body side unit and the back side reading unit, reads the front side, and then reads the back side. Because it is reading, there is no need for a page bumper and the load on the main unit is small. Furthermore, since the paper path is simple, there is an effect that the risk of paper jamming is reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view of the image input device of the present invention, Fig. 2 is a sectional view of the back side reading unit, Fig. 3 is a sectional view of the main part of the main unit, and Fig. 4 is a perspective view showing the mounting structure of the paper ejection tray. 5 are cross-sectional views showing a conventional double-sided reading unit. In the figure, ■ = main unit 3: reading table 5: automatic reading unit on the main body side 8: paper output tray 9: reading head 21: controller 22: sensor 27: paper path 28: back side reading unit 30: paper feed slot 32 :Paper path 33.34
: Roller device 35 : Drive motor 37 : Reading head 40 Guide plate 41.42 : Pin

Claims (1)

[Claims] 1. Attaching devices (41) and (42) for attaching to the main unit (1) in place of the paper output tray (8), and a paper feed port for attaching paper ejected from the main unit to the main unit (1). (30) Guide plate (4)
0), and a substantially horizontal paper path (32) on the extension of the guide plate.
) and a drive device (35) for the roller device, and a reading head (37) arranged only on one side of the paper path (32),
A back side reading unit of an image input device, wherein the reading head is disposed on the opposite side of the paper path (32) with respect to the reading head (9) on the main body side. 2. The main unit (1) has a single-sided automatic reading unit (5)
A flatbed type reading stand (3) consisting of a transparent flat plate and
The automatic reading unit (5) is installed adjacent to the reading area of the flatbed type reading platform (3) and is arranged to extend from the reading platform (3) side to the paper output tray (8) on the side of the device. The reading head (9
) and a sensor (22) that detects the end of the paper passing through to detect the end of the reading operation of one document, and includes the main body device (1) and the above-mentioned sensor of the main device. Claim 1: Installed in place of the paper output tray
The back side reading unit (28) and the main unit (1)
control means (21) for receiving a reading end signal and giving a reading start command to the back side reading unit;
Image input device. 3. Guide plate (40) of back side reading unit (28)
3. The image input device according to claim 2, wherein a space is formed between the main device (1) and the back side reading unit (28) in which the document sheet can be sufficiently bent.