JPH07114229A - Original reader - Google Patents

Abstract

PURPOSE:To prevent an original cover sheet from being stripped off by the sheet winding means in the original reader provided in a copying machine, a scanner and a facsimile equipment, etc., particularly the original reader capable of reading a book original. CONSTITUTION:In the original reader provided with an original reading means 10 for reading the original page image of a book original 100 corresponding to the movement of a carriage 2, a page turning means 30 for turning the original page of the book original and an original pressing means for pressing the book original placed on the original platen in the spread state, the original pressing means is provided with a sheet winding means for winding and unwinding in corresponding to the movement of the carriage 2, plural original cover sheet 51 and 52 interposed between the carriage 2 and the device frame for pressing the book original by the original cover means at the both side in the moving direction of the carriage 2, and the sheet winding means is composed of the fixing member and the outer cylinder part for holding the original cover sheet 51 and 52 there between.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading device provided in a copying machine, a scanner, a facsimile machine or the like, and more particularly to a document reading device capable of reading a book document.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made in order to automate the troublesome reading of a book document. For example, when the book document is placed on the platen with the book document opened, an optical reading means and a page are provided. It is known that an original reading unit having a turning means reciprocates while contacting the original surface of a book original to perform reading and page turning. Further, when the document reading unit reads a book document, it is also devised to prevent the lifted or misaligned book document by pressing the book document with a document pressing sheet.

[0003]

By the way, when reading a wide book original, it is necessary to use such an original pressing sheet having a large area and wide width. For example, when the reading width is A3 width, the document pressing sheet width is A3.
A width of 297 mm or more is required. Further, in order to hold the book document, various rollers on which the document pressing sheet is wrapped and the end of the document pressing sheet are attached so that the tension can be maintained evenly applied to the entire area of the document pressing sheet. It is preferable to arrange the parts so that they are parallel to each other. However, when the original pressing sheet becomes large, in order to arrange the above members while maintaining the parallel state, it is necessary to attach the mounting portion at the end of the original pressing sheet so as to be parallel to various rollers. It costs. Further, in order to keep such a large original pressing sheet stretched, it is necessary to add 2 to the end of the original pressing sheet.
Since it is necessary to apply a tension of 3 kg, if the edge of the document holding sheet is fixed to the take-up roller with an adhesive,
It was not reliable enough in terms of mounting strength such as sheet peeling.

The present invention has been made in view of the above problems, in which various rollers around which a document pressing sheet is wound and attachment portions of the document pressing sheet end portions are set in parallel with each other, and the sheet end is provided. (EN) A document reading device with a page holding device having an attachment portion of an end portion of a document holding sheet for fixing a portion of the document with sufficient strength.

[0005]

In order to achieve the above object, the invention according to claim 1 is a document reading means for reading a document page image of a book document as the carriage moves, and a document page of the book document is turned over. In a document reading apparatus including a page turning unit and a document pressing unit that presses a book document placed on a document table in a spread state, the document pressing unit presses the book document on both sides in the moving direction of the carriage. A plurality of document pressing sheets interposed between the carriage and the apparatus frame for winding, and sheet winding means for winding and unwinding the document pressing sheets corresponding to the movement of the carriage. The winding means is characterized by comprising a fixing member for sandwiching the original pressing sheet and an outer cylinder portion.

Further, the invention according to claim 2 is characterized in that the fixing member and the outer cylindrical portion form a cylindrical surface in a joined state.

[0007]

According to the document reading apparatus of the present invention, the sheet winding means is composed of the fixing member for holding the document pressing sheet and the outer cylinder portion. However, the position of the original pressing sheet can be easily adjusted so that it is parallel to the various rollers around which the original is pressed, and the original pressing sheet can be maintained in a tensioned state with a minimum tension. It is possible to prevent the document pressing sheet from being peeled off by the sheet winding means.

In the document reading device according to the second aspect of the invention, the fixing member and the outer cylinder portion forming the sheet winding means have a cylindrical surface in a joined state, and the document pressing sheet can be smoothly wound and unwound. It is possible to maintain a tension state without applying excessive tension to the document pressing sheet. Therefore, it is possible to further reduce the separation of the document pressing sheet by the sheet winding means.

[0009]

The present invention will be described in detail below. 1 to 5 are views showing an embodiment of a document reading apparatus according to the inventions of claims 1 and 2. First, the configuration will be described. In FIG. 1, reference numeral 1 denotes a known document table on which a book document 100 can be placed in a spread state. The document table 1 is composed of a pair of left and right elevating mechanisms 1a and 1b corresponding to the pages 101 and 102 of the book document 100 in a spread state. It is designed to go up and down. Reference numeral 2 denotes a carriage on which a document reading unit 10 and a page turning unit 30 described later are mounted, and the carriage 2 reciprocates in the left-right direction in FIG. 1 by the driving force from the stepping motor 3 and the timing belt 4. 51, 5
Reference numeral 2 is an original pressing sheet for pressing a book original, and the take-up roller 5 is provided on one side in the front-rear direction as the carriage 2 moves.
One of the three and 54 is fed out and the other is wound up.

FIG. 2 shows the internal construction of the carriage. As shown in FIG.
A, 11B, a reduction optical system including mirrors 12 to 14, a lens 15 and the like, and a known CCD (Charge Couple Devic).
e) It has a substrate 16 and is adapted to read the original image of the spread pages 101 and 102 of the block original 100 when the carriage 2 scans and moves from the left side to the right side in the drawing. The document reading apparatus of the present embodiment can also read the image of the sheet document 8 placed on the contact glass 7 by selectively interposing the optical path switching mirror 17.

Reference numeral 50 denotes an original pressing means, and the original pressing means 50 has a plurality of original pressing sheets 51 and 52 for pressing the block original 100. These document holding sheets 5
Reference numerals 1 and 52 denote the carriage 2 and the device frame 9 so as to press the block original 100 on both sides in the moving direction of the carriage 2.
Is fixed to the fixing portion 55 or 56 on the apparatus frame 9 side at one end side, and is wound around the winding rollers 53 and 54 which are sheet winding means at the other end side. Further, the document pressing sheets 51, 52 are wrapped around the guide rollers 57, 58, 59 provided in the carriage 2 and the guide rollers 60, 61 provided in the main body of the apparatus and folded back. Therefore, when the carriage 2 moves, both document holding sheets 5 are correspondingly moved.
One of the windings 1 and 52 is wound and the other is unwound, but the winding and unwinding speeds of the winding rollers 53 and 54 are twice the moving speed of the carriage 2.

The take-up rollers 53 and 54 are driven by a stepping motor 3 which is the same drive source as the drive means of the carriage 2. Specifically, as shown in FIG. 1, gears (not shown) are attached to the pulleys 31 and 32 and the take-up rollers 53 and 54, respectively. Winding roller 53 through 34,
The rotation is transmitted to the gear on the 54 side and the winding rollers 53, 5
4 is adapted to rotate in association with the movement of the carriage 2.

FIG. 3 shows urging means provided in each of the winding rollers 53 and 54. The urging means is each winding roller 5
3, 54 are constantly urged in the winding direction, and a predetermined tension for pressing the block original 100 on the original table 1 is applied to the original pressing sheets 51, 52. This urging means is provided as two sets of units (only one set is shown in FIG. 3) consisting of a pair of mainsprings 20, a case 21, a mainspring presser 22 and a screw 25. The set is the rotary shaft 2 of each winding roller 53, 54.
3 are spaced apart from each other on both sides. Further, the mainspring 20 of the urging means is provided with the urging means even if the substantial winding diameter of the document pressing sheets 51 and 52 changes due to the winding and unwinding of the winding rollers 53 and 54. A material having a sufficiently small spring constant is adopted so as not to change so much, and is interposed between the rotary shaft 23 of each winding roller 53 or 54 and the outer cylinder portion 24. That is, mainspring 2
The inner end portion of the mainspring 0 is fixed to the rotary shaft 23 by the mainspring presser 22 and the screw 25, and the outer end portion of the mainspring spring 20 is locked to the case 21.
With the slit fitting at both ends of the outer tubular portion 24,
The rotary shaft 23 and the outer cylinder portion 24 are connected to each other so as to be rotatable relative to each other and to apply the tension to the document pressing sheets 51 and 52.

In FIG. 4, 40 is a take-up roller 53.
It is a fixing member for fixing the document pressing sheet 51 (52) by fixing it to the outer cylinder portion (54). The fixing member 40 is provided with a screw hole 41 to be screwed to the outer tubular portion 24 and a convex portion 4 that engages with the concave portion 42 of the outer tubular portion 24.
Have three. The outer cylinder portion 24 has a screw hole 44 for screwing the fixing member 40 and a concave portion 42 that engages with the convex portion 43 of the fixing member 40. The fixing member 40 and the outer cylinder portion 2
Both shapes of 4 are preferably determined so that the surface becomes a cylinder in the joined state. Further, the joint surface between the fixing member 40 and the outer cylinder portion 24 is preferably a flat surface.

A procedure for mounting the document pressing sheet 51 (52) on the take-up roller 53 (54) using the fixing member 40 will be described. First, the cylindrical portion 45 is created at the tip of the document pressing sheet 51 (52). Through holes 46 are provided in the cylindrical portion 45 of the document pressing sheet at positions corresponding to the screw holes 41 and the convex portions 43 of the fixing member 40. Next, the fixing member 40 is inserted inside the cylindrical portion of the document pressing sheet, the document pressing sheet 51 (52) is sandwiched between the fixing member 40 and the outer cylindrical portion 24, and the fixing member 40 and the outer cylindrical portion 24 are screwed with each other. By fixing the document holding sheet 51 (52) to the take-up roller 53 (54), the document pressing sheet 51 (52) can be fixed. At this time, the take-up roller 53 of the document pressing sheet 51 (52)
The original pressing sheet is arranged so that the mounting portion to (54) is parallel to the guide rollers 57 (58) (59) provided in the carriage 2 and the guide rollers 60 (61) provided in the apparatus main body. The position of 51 (52) is adjusted with respect to the outer cylinder portion 24 and then fixed.

Further, as shown in FIG. 5, the page turning means 30 includes a drive roller 70 and a pair of swing arms (not shown) swingably supported at one end by both end shafts of the drive roller 70. A driven roller 71 rotatably supported on the other end of the pair of swing arms, a winding belt 72 wound between these rollers 70, 71, and an upper running surface portion of the turning belt 72 so as to come into contact with each other. The charging roller 73 arranged,
A driven roller lifting means (not shown, for example, a solenoid) for rocking the swing arm upward to lift the driven roller 71 and inclining the turning belt 72 as shown by a solid line in FIG. It is configured as a turning belt unit including. Here, when a high voltage is applied to the charging roller 73, the turning belt 72
An unequal electric field is formed on the surface, and this non-uniform electric field generates an attractive force. Also, the carriage 2
A plurality of gears (not shown) are attached to a side plate (not shown) of the No. 1 and the diameter of the gears and the driving roller are set so that the turning belt 72 rotates at the same speed as the moving speed of the carriage 2. There is. Then, by using the attraction force generated by the charging roller 73, the movement of the carriage 2 from the right side to the left side in the figure, and the rotation of the turning belt 72 corresponding to the movement, the page turning operation of the book original 100 is performed. I am supposed to do it. Reference numeral 74 denotes a page storage portion into which the leading end of the original page turned up when the driven roller lifting means is operated is temporarily inserted.

Next, the page turning operation will be described.
First, when the book document 100 is set on the document table 1 in the spread state, the carriage 2 is moved in one direction, and the document reading unit 10 reads an image of two pages of the spread document. Then, the carriage 2 is moved in the other direction,
When the sensor (not shown) detects that the drive roller 70 has reached the original page 102, the charging roller 73 operates and an attracting force is generated on the turning belt 72. At this time, the oscillating arm is driven upward by the driven roller lifting means and the driven roller 71 is lifted, and the original page 102 adsorbed to the turning belt 72 under the driving roller 70 is right in FIG. With the movement from the left to the left, the sheet is gradually conveyed to the side opposite to the moving direction, and is inserted into the page storage portion 74 from the front end. Then, after the drive roller 70 passes through the original page 102,
This time, as the carriage 2 moves, the original page 102 is pulled out from the page storage section 74, and the page is turned.

[0018]

As described above, according to the first aspect of the invention, the sheet winding means is constituted by the fixing member for holding the original pressing sheet and the outer cylinder portion. The position of the document pressing sheet of the means can be easily adjusted so as to be parallel to various rollers around which the sheet is wound, the document pressing sheet can be maintained in a tensioned state with the minimum tension, and the document pressing sheet can be maintained. Since the mounting portion of the sheet can be fixed with sufficient strength, it is possible to provide a document reading device with a page turning device in which the document holding device does not peel off the document holding sheet by the sheet winding means.

According to the second aspect of the present invention, the fixing member and the outer cylinder portion constituting the sheet winding means form a cylindrical surface in the joined state, and the original pressing sheet can be smoothly wound and unwound, so that the original The tensioned state can be maintained without applying excessive tension to the presser sheet. Therefore, it is possible to provide the document reading device with the page turning device in which the document pressing sheet is not peeled off by the sheet winding means.

[0020]

[Brief description of 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 a carriage unit shown in FIG.

FIG. 3 is an exploded view of the take-up roller of FIG.

FIG. 4 is an exploded view of the outer cylinder portion of FIG.

FIG. 5 is an overall view of page turning means.

[Explanation of symbols]

1. Platen 2. Carriage 3. Stepping motor 4. Timing belt 9. Device frame 10. Document reading means 20. Mainspring 21. Case 22. Mainspring presser 23. Rotating shaft 24. Outer tube part 25. Screw 26. Flange 30. Page turning means 40. Fixing member 41. Screw hole 42. Recess 43. Convex part 44. Screw hole 45. Cylindrical part 46. Through hole 50. Document holding means 51.52. Original pressing sheet 53.54. Take-up roller 55.56. Fixed part 57.58.59. Guide roller 60.61. Guide roller 100. Book manuscript

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 1/00 108 Q

Claims (2)

[Claims] 1. An original reading unit for reading an original page image of a book original according to a movement of a carriage, a page turning unit for turning an original page of the book original, and a book original placed on the original table in a spread state. In a document reading apparatus provided with a document holding unit for holding the document holding unit, the document holding unit holds a plurality of document holding units interposed between the carriage and the device frame for holding the book document on both sides in the moving direction of the carriage. A sheet, and a sheet winding unit that winds and unwinds the document holding sheet in accordance with the movement of the carriage, wherein the sheet winding unit includes a fixing member for sandwiching the document holding sheet and an outer cylinder portion. A document reading device comprising: 2. The document reading apparatus according to claim 1, wherein the fixing member and the outer cylinder portion form a cylindrical surface in a joined state.