JP3249241B2 - Document 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 original reading apparatus used for a copying machine, a scanner, a facsimile apparatus, etc., and more particularly to an original reading apparatus capable of reading a book original.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made in order to automate the reading of a book document which is troublesome. For example, when a book document is placed on a platen with a double-page spread,
It is known that a document reading unit having optical reading means and page turning means reciprocates while contacting the document surface of a book document to perform reading and page turning.

As this type of document reading apparatus, there are those described in, for example, JP-A-4-51138 and JP-A-4-51173. This device has both an automatic sheet document feeding function and a book document reading and page turning function. By applying a voltage for suction to an endless turnover conveyance belt as a document pressing means, an uneven electric field is applied. Is generated, thereby generating a document attracting force. The endless turning transport belt is disposed so as to surround a carriage on which the reading unit and the page turning unit are mounted, and is guided by a plurality of guide rollers.

[0004]

However, in such a conventional document reading apparatus capable of reading a book document, since the endless turn-over conveyance belt rotates along a wide traveling path surrounding the carriage, it is difficult for the conventional document reading apparatus to read the book document. The device became large due to the need to secure a space for the traveling route.
In addition, although automatic feeding of a sheet document is possible, the document information cannot be read by placing the sheet document on a contact glass as in a normal copying machine.

[0005] Therefore, the present invention is to devise a document pressing unit, and to provide to FIG RuHara draft reading apparatus compact original reading apparatus.

[0006]

According to an aspect of the present invention, there is provided a document reading unit for reading a document page image of a book document with movement of a carriage, and a page turning page of the book document. Turning means and the original
A document pressing device for holding a book document placed in a spread state on a document table so that pages face upward , wherein the document pressing device includes the book pressing device on both sides in the movement direction of the carriage. A plurality of document holding sheets that are arranged to hold a document and are wound on one side in the moving direction of the carriage and are unwound on the other side in the moving direction; and winding the document holding sheet in accordance with the movement of the carriage. And a sheet winding means for unwinding the sheet.

According to a second aspect of the present invention, the sheet winding means is a winding roller capable of winding and unwinding the document pressing sheet. The invention is characterized in that the sheet winding means is driven by the same drive source as the carriage, and the invention according to claim 4 is a biasing means for biasing the winding roller in a winding direction. Means is provided in the take-up roller, and the urging means applies a predetermined tension to the document pressing sheet.

[0008]

According to the first aspect of the present invention, a method of moving the carriage is provided.
On one side and the other side, a plurality of document holding sheets are
Since the book document is pressed on both sides in the moving direction of the carriage while being taken up and unwound in accordance with the movement of the carriage by the sheet take-up means, most of the document holding sheet faces the document except for the portion to be wound. It becomes a sheet. Therefore, the document pressing means is made compact, and the upper part of the carriage is not covered with the sheet, and can be used for reading a sheet document.

According to the second aspect of the present invention, since the sheet winding means is a winding roller capable of winding and unwinding the document holding sheet, the structure of the sheet winding means can be simplified and made compact. it can. According to the third aspect of the present invention, the sheet winding means is driven by the same drive source as the carriage, so that there is no need to provide a motor dedicated to winding, and the size and cost can be reduced.

According to the fourth aspect of the present invention, since a predetermined tension is applied to the document pressing sheet by the urging means provided in the take-up roller, the size can be reduced by saving space.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIGS. 1 to 3 show an embodiment of a document reading apparatus according to the first to fourth aspects of the present invention. First, the configuration will be described. 1 and 2, reference numeral 1 denotes a document table on which a book document 100 can be placed in a two-page spread state. The platen 1 holds pages 101 and 10 of a book manuscript 100 in a two-page spread state.
It consists of a pair of left and right lifting mechanisms 1a and 1b corresponding to 2,
These elevating mechanisms 1a and 1b move up and down separately according to the thickness and opening degree of the book document 100, and push the book document 100 upward in the drawing so as to press the book document 100 with a predetermined pressure by document holding sheets 21 and 22 described later. Is to be urged. Reference numeral 2 denotes a carriage on which a document reading unit 3 and a page turning unit 4 described later are mounted, and the carriage 2 is driven by a driving unit 50. The drive means 50 transmits the rotation of the stepping motor 51 (drive source) to the pulley 53 (for example, a pair provided on both sides of the carriage 2) via the timing belt 52, and the wire wound between the pulleys 53 and 54. By rotating 55, the carriage 2 locked at a predetermined position of the wire 55 is reciprocated in the left-right direction in FIG.

FIG. 2 shows the configuration inside the carriage. As shown in FIG.
A, 5B, a reduction optical system including mirrors 6 to 8 and a lens 9 and a photoelectric conversion element 10 such as a well-known CCD (Charge Coupled Device), and the carriage 2 scans from left to right in the drawing. At this time, the document images of the facing pages 101 and 102 of the book document 100 are read. Reference numeral 11 denotes an optical path switching mirror which moves forward and backward with respect to the sheet original reading position Ps. Placed sheet document
Thirteen images can also be read. Also, the page turning means 4
Are supported by a drive roller 14, a pair of swing arms (not shown) that are swingably supported at one end by shafts at both ends of the drive roller 14, and rotatably supported by the other end of the pair of swing arms. A driven roller 15 parallel to the driving roller 14, a winding belt 16 wound between the rollers 14, 15, a winding belt 16
A charging roller 17 arranged to contact the upper running surface of the
A turning roller unit (not shown, for example, a solenoid) for raising the driven roller 15 by oscillating the oscillating arm upward and inclining the turning belt 16 by a predetermined angle. Is configured as Here, the charging roller 17 has a shaft portion pressed against an electrode (not shown), and when a high voltage is applied from the charging roller 17, an uneven electric field is formed on the winding belt 16. Thus, an attraction force is generated. Although not shown, a predetermined gear is rotatably mounted on one side of the carriage 2. The gear meshes with a driving gear provided at an end of the driving roller 14, and the gear of the carriage 2 is It meshes with a rack fixed parallel to the moving direction. These gears, the roller diameter of the drive roller 14 and the like are set so that the turning belt 16 rotates at the same speed as the moving speed of the carriage 2. Then, the book original 100 is utilized by using the attraction force generated by the charging roller 17, the movement of the carriage 2 from the right side to the left side in the figure, and the rotation of the turning belt 16 corresponding to the movement.
Page turning operation (details will be described later). Reference numeral 18 denotes a page storage section into which the leading end of the document page turned up when the driven roller lifting means is operated is temporarily inserted.

Reference numeral 20 denotes a document pressing means. The document pressing means 20 has a plurality of document pressing sheets 21 and 22 for pressing the book document 100. These document holding sheets 21,
Reference numeral 22 is used to hold the book document 100 on both sides in the movement direction of the carriage 2, and is fixed at one end to the fixing portion 39 or 41 on the apparatus frame 23 side, and is wound at the other end as a sheet winding means. It is wound around rollers 24 and 25.
The original pressing sheets 21 and 22 are moved by guide rollers 42, 44 and 45 provided in the carriage 2 and the carriage 2.
It is wound around guide rollers 43 and 46 provided on both sides in the moving direction and is folded back. Therefore, when the carriage 2 moves, the two document pressing sheets correspond to the movement.
One of the windings 21 and 22 is unwound while the other is unwound. The winding and unwinding speeds of the winding rollers 24 and 25 are twice as high as the moving speed of the carriage 2.

The winding rollers 24 and 25 are driven by a stepping motor 51 which is the same driving source as the driving means 50 of the carriage 2. In particular,
Gears (not shown) are attached to the pulleys 53, 54 and the take-up rollers 24, 25, respectively. The gears attached to the pulleys 53, 54 are connected to the take-up rollers 24, 25 via a plurality of transmission gears 61, 62. The rotation of the take-up rollers 24, 25 is interlocked with the movement of the carriage 2.

In FIG. 3, reference numeral 70 denotes each winding roller 24, 25.
The urging means 70 constantly urges each of the winding rollers 24 and 25 in the winding direction, and presses the book document 100 on the document table 1 with the document pressing sheets 21 and 22. The predetermined tension is applied. This urging means 70 is composed of two sets of units (FIG. 3) each including a pair of a mainspring spring 27, a case 28, a mainspring holder 29 and a screw 30.
Only one set is shown in the figure).
These two sets are arranged at both ends of the rotating shaft 26 of each of the winding rollers 24 and 25 with a space therebetween. Further, the mainspring 27 of the urging means 70 has a small force even when the actual winding diameter of the document pressing sheets 21 and 22 changes as the winding rollers 24 and 25 are wound and unwound. The spring constant is small enough so that it does not change.
27 is interposed between the rotating shaft 26 of each winding roller 24 or 25 and the outer cylinder 31. That is, the inner end of the mainspring 27 is fixed to the rotating shaft 26 by the mainspring holder 29 and the screw 30, and the outer end of the mainspring 27 is locked to the case 28,
The case 28 is slit-fitted to both ends of the outer cylinder 31 together with the flange 32, so that the rotation shaft 26 and the outer cylinder 31 can rotate relative to each other and apply the tension to the document pressing sheets 21 and 22. Connected so that

Next, the operation will be described. First, when reading the image of the sheet document 13 placed on the contact glass 12, the optical path switching mirror 11 moves to the sheet document reading position Ps, and the light emitted from the illumination 5A and reflected by the document surface is reflected by the mirror. The light passes through a reduction optical system composed of 7, 8 and a lens 9 and is read by the photoelectric conversion element 10.

On the other hand, when the book document 100 is set on the document table 1 in a double-page spread state, after the optical path switching mirror 11 retreats from the sheet document reading position Ps, the carriage 2 is moved in one direction and irradiated from the illumination 5B. And book manuscript 100
The light reflected on the original surface passes through a reduction optical system including mirrors 6 to 8 and a lens 9 and is read by the photoelectric conversion element 10. The reading area at this time is two pages in a double-page spread state.
Reaching 100 is detected by a sensor (not shown).

Next, when the carriage 2 is moved in the other direction and the sensor (not shown) detects that the drive roller 14 has reached the original page 102, the charging roller 17 operates to generate an attraction force on the turning belt 16. . At this time, the swinging arm is driven upward by the driven roller lifting means, and the driven roller 15 is lifted.
102 is gradually its moving direction with the movement from right to left in FIG. 4 the carriage 2 is transported to the opposite side, is inserted from the tip to the page storing unit 18. Then, after the drive roller 14 has passed the document page 102, the document page 102 is pulled out of the page storage unit 18 with the movement of the carriage 2 and the page is turned.

In this embodiment, the book original 100
When reading the image information of both sides of the carriage 2 in the moving direction
While the original pressing sheets 21 and 22 are wound and unwound by the winding rollers 24 and 25 in accordance with the movement of the carriage 2, the book original 100 is pressed on both sides in the moving direction of the carriage 2. Therefore, most of the document pressing sheets 21 and 22 are sheets opposed to the book document 100 except for portions to be wound by the winding rollers 24 and 25. Accordingly, the document pressing means 20 is made compact, and the upper part of the carriage 2 is not covered with the sheet, and the sheet document placed on the contact glass 12 is
Thirteen images can be read in the same manner as a normal copying machine. As a result, it is suitable for a copying machine.

Further, in this embodiment, since the sheet take-up means is the take-up rollers 24, 25 capable of taking up and unwinding the document holding sheets 21, 22, the structure of the sheet take-up means is simplified and compact. Can be achieved. further,
Since the sheet take-up means is driven by the stepping motor 51 which is the same drive source as the carriage 2, there is no need to provide a dedicated take-up motor, and it is possible to reduce the size and cost.

In this embodiment, the winding rollers 24, 25
Document holding sheets 21 and 22 are provided by urging means 70 provided in
Since a predetermined tension is applied to the device, the size of the device can be reduced by saving space. FIG.
FIG. 11 is a diagram showing another embodiment of the document reading apparatus according to the described invention. This embodiment is different from the above-described embodiment in that the specific configuration of the urging means is simplified, and the configuration other than the winding roller is the same as the above-described example. Therefore, only the main parts will be described here.

In FIG. 4, the biasing means 70 is configured as follows. That is, a pair of pins 34 is press-fitted into the rotating shaft 33 of each of the winding rollers 24 and 25, and the rotating shaft 33
, A pair of torsion coil springs 35 having both ends bent are attached. One end of the torsion coil spring 35 is
34, the other end is locked in the slit 37 of the outer cylindrical portion 36, and is prevented from coming off by the flange 38, so that the winding roller 24,
25 are each assembled. Then, the winding rollers 24 and 25 constantly urge the outer cylinder portion 36 in the winding direction,
Book manuscript 100 on manuscript platen 1 on manuscript holding sheets 21 and 22
And a predetermined tension for holding down.

In this embodiment, the same effect as in the above-described embodiment can be obtained. Moreover, the configuration of the urging means 70 is simplified, the number of parts is reduced, and the number of assembly steps is reduced, so that cost reduction can be achieved.

[0024]

As described above, according to the first aspect of the present invention, the document holding sheets on both sides in the moving direction of the carriage are wound and unwound by the sheet winding means in accordance with the movement of the carriage. Since the book original is pressed on both sides in the moving direction of the carriage, the original pressing means can be made compact, and the upper part of the carriage can be used for reading the sheet original without being covered with a sheet. It is possible to provide a small-sized and low-cost document reading apparatus in which a page turning function is added to a document reading apparatus such as a copying machine.

According to the second aspect of the present invention, since the sheet winding means is a winding roller capable of winding and unwinding the document pressing sheet, the structure of the sheet winding means can be simplified and made compact. it can. According to the third aspect of the present invention, since the sheet winding means is driven by the same drive source as the carriage, there is no need to provide a motor dedicated to winding, and the size and cost can be reduced.

According to the fourth aspect of the present invention, since a predetermined tension is applied to the document pressing sheet by the urging means provided in the take-up roller, the size can be reduced by saving space.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a document reading apparatus according to the present invention.

FIG. 2 is an enlarged view of the carriage unit.

FIG. 3 is an exploded perspective view of a winding roller showing a configuration of the urging means.

FIG. 4 is an exploded perspective view of a take-up roller showing another embodiment of the document reading apparatus according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 document table 1 a, 1 b left and right pair of elevating mechanism 2 carriage 3 document reading means 4 page turning means 21, 22 document pressing sheet 23 device frame 24, 25 take-up roller 26 rotation shaft 27 spring 31, 36 outer cylinder 35 torsion Coil springs 42, 43, 44, 45, 46 Guide rollers 50 Drive means 51 Stepping motor (drive source) 52 Timing belt 53, 54 Pulley 61, 62 Transmission gear 70 Biasing means 100 Book documents 101, 102 Document pages

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/04-1/207 G03G 15/04-15/047

Claims (4)

(57) [Claims] A document reading means for reading an original page images of a book document 1. A with the movement of the carriage, and means turning the page turning the document page of a book original, the document page
A document pressing device for holding a book document placed in a spread state on a document table so as to face upward ; anda document reading device comprising: a document pressing device configured to move the book document on both sides in the moving direction of the carriage. A plurality of document pressing sheets that are disposed so as to be pressed and are wound on one side in the moving direction of the carriage and are unwound on the other side in the moving direction; and winding and winding the document pressing sheets corresponding to the movement of the carriage. An original reading device, comprising: a sheet take-up means for removing the original. 2. An original reading apparatus according to claim 1, wherein said sheet winding means is a winding roller capable of winding and unwinding the original pressing sheet. 3. An original reading apparatus according to claim 1, wherein said sheet winding means is driven by the same drive source as said carriage. 4. An apparatus according to claim 1, further comprising: a biasing means for biasing said winding roller in a winding direction, provided in said winding roller, and applying a predetermined tension to said document pressing sheet by said biasing means. Item 2. The document reading device according to Item 2.