JPS59140772A - Both-face original reader - Google Patents

Abstract

PURPOSE:To allow one read part to read both faces of an original successively by providing the 1st and the 2nd conveying means, and inverting the original conveyed by the 1st conveying means and then conveying it by the 2nd conveying means and reading the original. CONSTITUTION:When the original 71 is set in an original supply tray 21, the 1st sensor 29 detects that and operates a device. The original is conveyed by the rotation of a feed roller 27 and sent to a guide plate 26 by a roller 35 for inverting the original and a pinch roller 36 through a guide plate 23 and platen glass 24. At this time, the 1st original conveyance path switching mechanism 29 is positioned as shown by dotted lines, and the original is further conveyed and set in an original drawing-in tray 41 while inverted. Then, the 2nd original conveyance path switching mechanism is switch to a dotted-line position and rollers 45 and 43 are reversed to convey the inverted original, reading its reverse surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double-sided document reading device that can read both sides of a document.

The original reading device that reads the image information of the original is a Noah, Kushimisu, copier, or OMR (Optical Marker).
It is used in electronic devices such as readers.

[Prior Art] For example, in a facsimile, image information of a document read by a reading unit on a sending side is transmitted to a receiving side using a telephone line, and is recorded in a recording unit on the receiving side. By the way, conventional facsimile document reading devices have only one reading section.
This allows only one side of the document to be read in one reading operation. Therefore, when reading both sides of a document, the following method is adopted. ■This is a method of copying the back side of the original using a copying machine, superimposing the resulting images on the front of the original, reading these into pages, and transmitting them. ■After the front side of the document has been read, the document is immediately turned over and the entire surface is read and transmitted. ■There is a method to read the front sides of multiple documents in succession, then turn them over, read the back sides in succession, and send them.

However, the above-mentioned method (2) has the disadvantage that the cost is high because the copied manuscript obtained by copying becomes obsolete after it has been sent. In method (■) above, if there are a large number of double-sided originals, each original must be turned over after the front side has been scanned, and the operator must remain at the facsimile until the end of the transmission. The disadvantage of not being able to carry out office work has arisen.

The above method (2) has the disadvantage that the original must be set twice, which is troublesome, and the image information read does not form pages, causing confusion on the receiving side.

Therefore, in order to solve the above-mentioned drawbacks, a double-sided document reading device has been developed that can continuously read both sides of a document with a single reading section.

FIG. 1 shows an example of such a conventional double-sided document reading device. In this apparatus, a document 2 sent out from a document supply tray 1 is sent onto a reading plate 4 via a carry-in guide plate 3 and the like. When the original 2 passes between a platen glass 5 provided on the reading plate 4 and an original pressing roller 6 pressed against the platen glass 5, image information on the surface of the original 2 is read by the reading unit 7. The original 2 after being read is reversed by the original reversing mechanism 8. The document 2 after being reversed is transferred to the conveyance path switching machine 9.
When the document is in the state shown by the solid line, it is sent between the platen glass 5 and the document holding roller 6, and when it is in the state shown by the dotted line, it is discharged to the document discharge tray 11 via the discharge guide plate 10 and the like. When the original 2 is sent between the platen glass 5 and the original pressing roller 6, the image information on the back side of the original is read by the reading section 7. After being read, the original 2 is discharged to the original discharge tray 11 via a discharge guide plate 12 provided above the carry-in guide plate 3 and the like. In this way, this device can continuously read both sides of the document 2 with one reading unit 7, and the above-mentioned drawbacks can be solved.

However, in such a device, since the document traveling directions when reading each image information on the front and back sides of the document 2 are opposite to each other, two document position detection sensors are required to determine the timing to start reading. Also, a special reading section 7 is required. For example, as shown in FIG. 2, the reading unit 7 includes a half mirror 14 that branches the light beam focused by the lens system 13 (FIG. 11) into two directions, and a focal position of each of the light beams branched in the two directions. 2 placed in
It is composed of a set of image sensors 15 and 16. The two sets of image sensors 15 and 16 scan in opposite directions; one operates when the front side of the document 2 is being read, and the other operates when the back side is being read. It has a sharp edge. In this way, two document position detection sensors and two sets of image sensors 15.
16, it is difficult to match the reading start timings of the former method, and it is also difficult to match the reading positions of the latter method, resulting in uneven quality and high cost. In addition, since the document 2 is discharged after the back side is read by the carry-out guide plate 12 provided above the carry-in guide plate 3, the document 2 after the back side is read is transferred to the carry-in guide plate 3.
There is a possibility that the paper may enter the machine and cause a paper jam. Further manuscript 2
When both sides of the document are read, there is a drawback that the next document 2 cannot be sent out from the document supply tray 1 until after the previous document 2 has been discharged to the document discharge tray 11. ) [Object of the invention] The present invention has been made in view of the above circumstances, and has the following features:
To provide a double-sided document reading device that can continuously read both sides of a document with two reading sections, and can also set the document traveling direction in the same direction when reading each image information on the front and back sides of the document. purpose.

[Means for Achieving the Object] In the present invention, the first document conveying means causes the document to pass through the reading section while traveling in a predetermined direction, and the document that has passed is reversed by the document reversing device.

Next, the second document conveying means causes the reversed document to travel in a direction opposite to the predetermined direction, and then in the predetermined direction, and is sent to the first document conveying means. This achieves the above-mentioned objective.

The present invention will be described in detail below with reference to Examples.

[Embodiment] FIG. 3 shows the main parts of a double-sided document reading device in an embodiment of the present invention. In this device, a guide plate 2 is provided between the document supply tray 21 and the document discharge tray 22.
3. A platen glass 24, a U-shaped guide plate 25, and a guide plate 26 are provided in this order. Original supply tray 21
A feed roller 27 and a tart roller 28 are provided between the feed roller 27 and the guide plate 23. A 1'-th sensor 29 is installed at a predetermined location in front of the feed roller 27. A first drive roller 30 and a first pinch roller 31 that are in rolling contact with the first drive roller 30 are provided between the guide plate 23 and the platen glass 24 . A guide plate 32 is installed above the platen glass 24. A second sensor 33 is provided at a predetermined upper part of the guide plate 32. A second drive roller 34 and a document reversing roller 35 in rolling contact with the second drive roller 34 are provided between the platen glass 24 and the U-shaped guide plate 25. The U-shaped guide plate 25 and the guide plate 26 In between, the document reversing roller 35 and a second
A pinch roller 36 is provided. That is, the U-shaped guide plate 25 is provided along the document reversing roller 35 and extends from the second drive roller 34 to the second pinch roller 36. A third sensor 37 is provided at a predetermined location on the guide plate 26 . A third drive roller 38 and a 33rd pinch roller 39 are provided between the guide plate 26 and the document discharge tray 22 and are in rolling contact with the third drive roller 38 .

The document discharge tray 22 is provided above the document supply 1-ray 21, and the document pull-in tray 41 is provided between them. A guide plate 42 is provided above the document drawer 1 to the tray 41.
is provided. Near the tips of the document pull-in tray 41 and the guide plate 42, a fourth drive roller 43 and a fourth roller 44 are provided in rolling contact with the fourth drive roller 43. A fifth drive reel 45 and a fifth pinch roller 46 are provided in the middle of the document pull-in tray 41 and the guide plate 42 . A fourth sensor 47 is provided at a predetermined location between the fourth and fifth drive rollers 43,45.

Fourth drive roller 43 and third dry roller 38
A guide plate 48 is provided between them.

A first document conveyance path switching mechanism 49 is provided at the intersection of the guide plate 48 and the document discharge tray 22. Fourth
A guide plate 50 is provided between the drive roller 43 and the first drive roller 30. Guide plate 50-4
A second document conveyance path switching mechanism 51 is provided at a location where the numbers 8 intersect.

The feed roller 27 and the first to fifth drive rollers 30.34.38.43.45 are rotated by one pulse motor (not shown).

FIG. 4 shows the first document conveyance path switching mechanism 49. As shown in FIG. The first switching mechanism 49 includes a switching plate 63 that is rotatably supported by the frame 61 via the shirts 1 to 62, and a rotary solenoid 64 that rotates the switching plate 63. The rotary solenoid 64 is attached to the frame 61 via a spacer 65 fJ4). The second switching mechanism 51 is the
Since the configuration is the same as that of the switching mechanism 49, detailed explanation thereof will be omitted.

Now, when an original 71 is set on the original supply tray 21 of this device, the first sensor 29 detects it and the first sensor 29 detects it.
), make the device operational.

In this state, when a double-sided reading start signal is output from a control section (not shown) at time t1, the pulse motor starts high-speed driving, and the first electromagnetic clutch (not shown) becomes connected (FIG. 5b). The driving force of the pulse motor is transmitted to the feed roller 27 via the first electromagnetic clutch.
Rotate this in the direction of the arrow (Fig. 5C). In addition, the driving force of the pulse motor is applied to the first to third drive rollers 30.3.
4.38, causing them to rotate at high speed in the direction of the arrow (Fig. 5d). By rotating the feed roller 27 in the direction of the arrow, the original 71 is sent out from the original supply tray 21. At this time, the manuscript 7 is created by the cutter roller 28.
1 double feeding is prevented.

The sent out document 71 is sent through the guide plate 23 between the first dry roller 30 and the first pinch roller 31, and further conveyed to run on the platen glass 24. .

When the leading edge of the document 71 reaches the second sensor 33 at time t2, the sensor 33 detects this (FIG. 50). As a result, the rotary solenoid 64 of the first switching m4fl49 is activated (FIG. 5f), and its switching play 1-6 is activated.
3 is in the state shown by the dotted line in FIG. Also, at this time, the second electromagnetic clutch (not shown) enters the forward rotation connection state (Fig. 5g).

As a result, the driving force of the pulse motor is transmitted to the fourth and fifth drive rollers 43, 45 via the second electromagnetic clutch, causing them to rotate in the direction of the arrow. Furthermore, at this time, the first electromagnetic clutch becomes in a disconnected state (FIG. 5b).

Then, the feed roller 27 rotates appropriately and then stops, following the movement of the original 710 being conveyed by the rotation of the first drive roller 30 (FIG. 5C), so that the next original 71 waits to be sent out. state.

When this device is incorporated in the sending side of a facsimile, after a certain period of time has elapsed from time t2 for communication with the receiving side, the pulse motor starts step driving, and the first to fifth drive rollers 30 .34.38.43.4
5 in the direction of the arrow (611 in Fig. 5))
. When the original 71 conveyed by the step rotation of the first drive roller 30 in the direction of the arrow passes through the line indicated by the symbol A on the platen glass 24, image information on the surface thereof is read by a reading section (not shown).

After reading, the original 71 is fed between the second drive roller 34 and the original reversing roller 35, and the conveying direction is changed by approximately 180 degrees by the U-shaped guide plate 25, and its front and back surfaces are reversed. Reversing roller 35
and the second pinch roller 36. The conveyed document 71 is sent through the guide plate 26 between the third drive roller 38 and the third pinch roller 39, and then the first
It is fed into the guide plate 48 by the switching mechanism 49 . The fed document 71 is fed between the fourth drive roller 43 and the fourth pinch roller 44 by the second switching mechanism 51, which is in the state shown by the solid line in FIG.
Further, the document is fed into the document pull-in tray 41. When the rear end of the document 71 passes the second sensor 33 at time t3, the second sensor 33 detects this (FIG. 5e). As a result, the pulse motor starts high-speed driving, and the first to fifth
The drive rollers 30, 34, 38, 43, and 45 are rotated at high speed in the direction of the arrow. Therefore, the document 71 is then fast-forwarded. The original 71 drawn into the original drawing tray 41 is moved by the fifth drive roller 45 and the fifth pinch roller 46.
It is sent in between and then pulled in further.

When the trailing edge of the document 71 passes the fourth sensor 47 at time t4, the sensor 47 detects this (FIG. 5j). As a result, the rotary solenoid 64 of the first switching mechanism 49
is in a non-driven state (FIG. 5f), and its switching bluetoro 3 is in a state not shown by a solid line in FIG. In FIG. j), the switching plate is in the state shown by the dotted line in FIG. 113. Furthermore, at this point, the second electromagnetic clutch is brought into a reverse connection state (FIG. 5, 9), and the fourth and fifth drive rollers 43, 45 begin to rotate at high speed in the direction opposite to the direction of the arrow (FIG. 5, h). For this reason, the document 71 is sent out from the document drawer 1 to the tray 41, and is moved to the guide plate 50 by the second switching mechanism 51, which is in the state shown by the dotted line in FIG.
sent to. Thereafter, the original 71 passes through the guide plate 50 and is moved between the first drive roller 30 and the first binge [1-ra 3].
1, and further conveyed to the platen glass 2.
'4.

When the leading edge of the document 71 reaches the second sensor 33 at time t5, the sensor 33 detects this (Fig. 5e).
. Due to this, after a certain period of time has elapsed from time t5, the pulse motor starts step driving and rotates the first to third drive rollers 30, 34, 38 step by step in the direction of the arrow. (Fig. 5 d), and the fourth and fifth drive rollers 43, 45 are rotated stepwise in the direction opposite to the direction of the arrow (Fig. 5 h). When the document 71 conveyed by the step rotation of the first drive roller 30 in the direction of the arrow passes the line indicated by the symbol A on the platen glass 24,
The image information on the back side is read by the reading section. After reading the document 71, the direction of conveyance of the document 71 is changed by approximately 180 degrees by the U-shaped guide plate 25, and its front and back surfaces are reversed. This inverted original 171 is delivered to the original discharge tray 22 by the first switching mechanism 49, which is in the state shown by the solid line in FIG.

When the rear end of the document 71 passes the second sensor 33 at time t6, the second sensor 33 detects this (FIG. 5e). As a result, the second electromagnetic clutch becomes disengaged (FIG. 5g), and the fourth and fifth drive rollers 43, 45 stop. Also, at this time, the pulse motor starts high-speed driving and rotates the first to third drive rollers 30, 34, 38 at high speed in the direction of the arrow (FIG. 5d). Therefore, the original 71 is then rapidly forwarded and delivered to the original discharge tray 22.

When the rear end of the document 71 passes the third sensor 37 at time t7, the =a sensor 37 detects this (Fig. 5k)
. As a result, after a certain period of time has passed from this time E7,
The pulse motor stops and the first to third drive rollers 3
0.34.38 stops.

When a plurality of originals 71 are set on the original supply tray 21 of this device, the back side of the previous original 71 is read, and once the trailing edge passes the second sensor 33, the next one can be read at any time thereafter. The reading operation of the Kyoto manuscript 71 can be started. For example, when the second sensor 33 detects the trailing edge of the document 71 before &f at time t6, or when the third sensor 37 detects it at time [7], or furthermore, when a certain period of time has elapsed from time t7, The rotation of the feed roller 27 is started, and the reading operation of the next document 71 can be started. In particular, if the reading operation of the next document 71 is started at time t6, the reading time can be shortened.

When only one original 71 is set on the original supply tray 21 of this device and it is sent out, or when multiple sheets are let and the last one is sent out, the original supply tray 21 becomes empty and the second The sensor 29 of No. 1 detects this (Fig. 5a).

After a certain period of time has elapsed from this talk time [7], the device enters the stop mode.

When this device reads only one side of the original 71, the control section outputs the single-sided reading star 1~ signal at time t1, and the reading operation is started. However, in this case, the first switching device WJ49 is held in a state not shown by a solid line in FIG. For this reason, the original 71 whose one side was read
is not sent to the document pull-in tray 41 but is directly discharged to the document discharge tray 22.

In this device, since the traveling direction of the document 71 is switched by the first and second switches 1149.51, paper jams do not occur.

In the above embodiment, the first and second switching mechanisms 49.5
Although the rotary Lenoid 64 is used as the drive source for the drive unit 1, the present invention is not limited to this, and it is of course possible to use, for example, the Planjean Lenoid 1. Furthermore, it goes without saying that the shape of the switching plate 63 is not limited to that shown in FIG. 4.

FIG. 6 shows an example of the second electromagnetic clutch. In this second electromagnetic clutch 81, when one rotary electromagnet 84 is excited, a disc 83 installed on the shaft 82 rotates together with the other rotary electromagnet 84.
When 5 is excited, it rotates together with it. One rotary electromagnet 84 includes gears 86 and 87, a shaft 88, a timing pulley 89, and a timing belt 9.
0 and the pulse motor 9 via the timing pulley 91
2) It is connected to the j-axis 93. The other rotating electromagnet 85 is connected to a timing pulley 94 and a timing belt 9.
5 and the pulse motor 9 via the timing pulley 96.
It is connected to the output shaft 93 of No. 2. ? The shaft 82 is connected to a shaft 98 of the fourth drive roller 43 via a joint 97.

When the pulse motor 92 is driven and its output shaft 93 rotates in the direction of the arrow, one rotary electromagnet 84 rotates in the direction of arrow B, and the other rotary electromagnet 85 rotates in the direction of arrow C. In this state, one of the rotary electromagnets 84 is energized, and in the case of an IC, the disk 83 and the shield 1 are integrated with it.
The shift 82 rotates, and the fourth drive roller 43 together with the shaft 98 rotates in the direction of the arrow, that is, in the direction of the arrow in FIG. When the other rotary electromagnet 85 is excited, the disk 83 and shaft 82 are integrally connected to it.
rotates, and the fourth drive roller 43 rotates together with the shaft 98 in the direction of arrow E, that is, in the opposite direction to the direction of the arrow in FIG. The shaft 98 of the fourth drive roller 43 is connected to the fifth drive roller via a timing belt (not shown) or the like.
The drive roller 45 is connected to a shaft (also not shown) of the drive roller 45 . Therefore, even if the pulse motor 92 continues to rotate in one direction shown by arrow A, the action of the second electromagnetic clutch 81 causes the fourth and fifth drive rollers 43, 45 to
can alternatively be rotated in the direction of the arrow in FIG. 3 or in the opposite direction.

In this example, one multi-speed electromagnetic clutch 81 is used, but it is of course possible to use two normal vehicle speed clutches.

[Effects of the Invention] As explained above, according to the present invention, since the document traveling direction is the same when reading each image information on the front and back sides of the document, document position detection is required to determine the timing to start reading. The number of sensors may be one, and the reading unit may be a simple one having one image sensor. Therefore, the reading start timings of the document position detection sensor and the reading positions of the image sensor coincide with each other, making it possible to achieve uniform quality and to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an example of a conventional double-sided document reading device, FIG. 2 is a schematic configuration diagram showing the reading section of the same device, and FIG. 3 is a main part of a double-sided document reading device in an embodiment of the present invention. 4 is a plan view showing the first document conveyance path switching mechanism of the device, FIG. 5 is a timing diagram shown to explain the operation of the device, and FIG. 6 is a diagram of the device. FIG. 3 is a sectional view showing an example of a second electromagnetic clutch. 21... Original supply tray, 22... Original discharge tray, 24... Platen glass, 27... Feed roller, 29.33.37.47. ...Sensor, 30.3
4.38.43.45...Drive roller, 35...Document reversing roller, 41...Document pull-in tray, 49.51...Document transport Road switching Ia side, 71・
...Manuscript. Applicant: Fuji Xerox Co., Ltd. Representative
Patent Attorney Ume Yu Yamauchi 1st
Figure 2 (¥) 3rd or 4th Figure 5 Figure 6

Claims (1)

[Claims] a reading section that reads image information of a document; a first document conveying means that causes the document to pass through the reading section while traveling in a predetermined direction; a document reversing section that reverses the document that has passed through the reading section; An original transport path switching means for selectively switching the running direction of the original that has passed through the reversing means between the ejection direction and the other direction; A double-sided document reading device comprising: a second document conveying device that travels in a direction opposite to the predetermined direction and then travels in the predetermined direction to feed the document to the first document conveying device.