JP2000090317A - Paper sheets reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of the read error of an original due to non-dried ink even when the non-dried ink is present on the original surface of paper sheets. SOLUTION: This reader is provided with a carrying means 4 for carrying the paper sheets P along a carrying path 11 and an image sensor 5 for reading the original by projecting light to the original surface of the paper sheets P being carried by the carrying means 4 and receiving the reflected light through a glass plate facing the upper surface (original surface) of the paper sheets P. The carrying means 4 is constituted so as to carry the paper sheets P so as to make the original surface of the paper sheets P pass through on a fixed plane from the upstream side to the downstream side of the image sensor 5 and the glass plate is position-set so as to be separated from the original surface of the paper sheets P at a prescribed distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a paper sheet reading apparatus for reading an original written on a paper sheet using an image sensor.

[0002]

2. Description of the Related Art Conventionally, an original reading apparatus as described in Japanese Patent Application Laid-Open No. 2-37870 is known. The document reading apparatus includes a glass plate disposed at a document reading position, a feeding mechanism for feeding sheets while the document surface is in contact with the glass plate, and a sheet feeding device for feeding a sheet to the document reading position of the glass plate. And a platen roller for pressing the folded paper sheet against the glass plate, and an image sensor for reading a document of the paper sheet moving on the glass plate.

The image sensor emits light through the glass plate to the paper sheet moving at the position where the document is read on the glass plate, receives the reflected light, and converts the intensity of the received light into a current to convert the original into a current. It is designed to read.

[0004]

By the way, in the conventional document reading apparatus as described above, the sheets move while the document surface is in contact with the glass plate (transparent plate), and the document reading position is increased. Is pressed in sliding contact on the glass plate by the platen roller. If there is ink that is not dried on the original surface of the paper sheet, this ink is transferred onto the glass plate and the transparency of the glass is hindered. Will be. When the transparency of the glass is impaired, there is a problem that the projection of light onto the document surface and the incidence of reflected light from the document surface are hindered, whereby the document cannot be read accurately. .

Further, the spread of the ink on the glass plate is often retransferred to the original surface of the paper sheet, and the original is modified by the retransfer, so that the image sensor reads an erroneous original. It also has problems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even if undried ink is present on the original surface of a sheet, the original document caused by the undried ink is present. It is an object of the present invention to provide a paper sheet reading apparatus in which reading errors do not occur.

[0007]

According to a first aspect of the present invention, there is provided a sheet reading apparatus for reading a document described on a document surface of the sheet. Means for transporting the original along the transport path, and an image of reading the original by projecting light on the original surface of the sheet being transported by the transport means and receiving the reflected light through a transparent plate facing the original surface. A transport unit that transports the paper sheet from the upstream side to the downstream side of the image sensor such that the document surface of the paper sheet passes on a predetermined plane. The image sensor includes the transparent plate. Are positioned so as to be separated by a predetermined distance from the document surface of the paper sheet.

According to this paper sheet reading apparatus, the paper sheet read by the image sensor through the transport path has the document surface facing the image sensor and facing the front side, and is separated from the image sensor. Transported in a state where
The document surface does not slidably contact other members including the platen roller, as compared with the conventional one in which the sheets are conveyed while being pressed against the platen roller while the document surface is in sliding contact with the transparent plate. If undried ink is present on the original surface of a sheet, the undried ink is transferred to the glass plate, and this transfer is re-transferred to the original surface and contaminates the original surface. Inconvenience such as erroneous reading by the sensor is reliably prevented.

According to a second aspect of the present invention, there is provided the paper sheet reader according to the first aspect, wherein the image sensor has a constant thickness around the transparent plate from the transparent plate to the side of the transport path. And a cover portion protruding therefrom is provided.

According to this paper sheet reader, the cover ensures the distance between the transparent plate and the document surface.

According to a third aspect of the present invention, there is provided the sheet reader according to the first or second aspect, further comprising a frame for mounting the transporting means and the image sensor. Is a first supporting member for supporting the transporting means.
A frame, and a second frame facing the first frame and supporting the image sensor, wherein the transport path is formed between the first frame and the second frame; The transport means is
An upstream conveying roller that is positioned so that a part of the peripheral surface is immersed in the conveying path on the upstream side and the downstream side of the first frame body, and is rotatably supported around an axis orthogonal to the conveying direction; A downstream conveying roller, a driving means for rotating and driving the pair of rollers, and a shaft provided on the second frame so that a peripheral surface thereof is in contact with the peripheral surface of the pair of rollers, and around an axis orthogonal to the conveying direction. And a pair of auxiliary rollers rotatably supported at the image sensor, wherein the image sensor is provided so as to traverse the transport path at a substantially intermediate position between the upstream and downstream transport rollers. It is a feature.

According to this paper sheet reading apparatus, in a state where the upstream and downstream transport rollers are driven and rotated by the driving of the driving means,
From the upstream side of the transport path formed between the first frame and the second frame, the posture is set so that the document surface faces the second frame, and the sheets are inserted into the transport path in the frame. As a result, the paper sheet first moves on the conveyance path toward the downstream side while being sandwiched between the upstream conveyance roller and the auxiliary roller, and the image sensor reads the written matter on the document surface in the middle.
When the leading end of the sheet reaches the downstream conveying roller, the leading end of the sheet is sandwiched between the downstream conveying roller and the auxiliary roller. Since the sheet is conveyed along the conveyance path, the conveyance state of the paper sheet is stabilized, and the reading of the written matter by the image sensor is performed without error.

Further, by supporting the image sensor on the second frame, it is possible to easily and surely secure a gap distance between the original document surface of the paper sheet being transported and the image sensor. Also, the adjustment of the separation distance becomes easy.

According to a fourth aspect of the present invention, in the paper sheet reader according to the third aspect, the first frame and the second frame are relatively rotated about a connection axis. It is characterized by being connected as possible.

According to this paper sheet reader, the first frame and the second frame are rotated about the connecting axis in a direction away from each other, so that the respective frames are opened from each other. Maintenance of the reader is facilitated.

According to a fifth aspect of the present invention, there is provided the sheet reader according to the third or fourth aspect, wherein the downstream transport roller has a peripheral speed lower than a peripheral speed of the upstream transport roller. The speed is set so as to be faster.

According to this paper sheet reader, the paper sheets supplied to the transport path between the first and second frames are advanced by being sandwiched between the upstream transport roller and the auxiliary roller, and the leading end thereof is moved forward. When reaching the downstream transport roller, the leading end side is held by the downstream transport roller and the auxiliary roller opposed thereto. In this state, since the peripheral speed of the downstream transport roller is faster than the peripheral speed of the upstream transport roller, the paper sheet is transported while the downstream portion is pulled forward. Therefore, the document surface facing the sheet image sensor is located on the same straight plane without a curved surface, so that the document is always normally read by the image sensor and erroneous reading is performed. It is surely prevented.

According to a sixth aspect of the present invention, in the paper sheet reader according to the fifth aspect, the downstream transport roller has a diameter larger than that of the upstream transport roller. The dimensions are set as follows.

According to this paper sheet reader, for example,
When the upstream conveying roller and the downstream conveying roller are connected by an endless belt via a predetermined pulley and are rotated at the same rotational speed, the peripheral speed of the downstream conveying roller having a large diameter is set to be faster than that of the upstream conveying roller. It becomes possible. As described above, the simple configuration in which the low dimension of the roller is different between the upstream side and the downstream side enables the peripheral speed of the downstream transport roller to be higher than the peripheral speed of the upstream transport roller, thereby reducing equipment costs. It is effective in achieving the realization.

As a measure for increasing the peripheral speed of the downstream transport roller to be higher than the peripheral speed of the upstream transport roller, as described above, the diameter of the downstream transport roller is made larger than the diameter of the upstream transport roller. In addition to setting, for example, an upstream pulley is provided on the upstream transport roller, and a downstream pulley is provided on the downstream transport roller, and the diameter of the downstream pulley is set smaller than that of the upstream pulley. An endless belt may be stretched between both pulleys.

Further, each of the upstream transport roller and the downstream transport roller may be configured to be driven by a dedicated drive motor, and the rotation speed of each drive motor may be controlled.

[0022]

1 and 2 are partially cutaway perspective views showing an embodiment of a paper sheet reading apparatus according to the present invention. FIG. 1 shows a second frame member having a first frame member. FIG. 2 shows a state in which the second frame is overlaid on top, and FIG. 2 shows a state in which the second frame is separated from the first frame. FIG. 3 is a sectional view taken along line AA of FIG. 1 and 2, the XX direction is referred to as the width direction, the YY direction is referred to as the front-back direction, and particularly the −X direction is leftward, the + X direction is rightward, the −Y direction is forward or downstream direction, The + Y direction is referred to as a backward or upstream direction.

As shown in these figures, a paper sheet reading apparatus 1 comprises a box-shaped lower frame (first frame) 2 and a box which is connected to the lower frame 2 at the upper part thereof so as to be detachable from and connected to the lower frame 2. Upper frame (second frame) 3 of the mold, transporting means 4 for transporting paper P sandwiched between lower frame 2 and upper frame 3, and papers being transported by transporting means 4 The image sensor 5 has a basic configuration including an image sensor 5 that projects light on the document surface of P and receives the reflected light through a transparent plate facing the document surface to read the document.

The lower frame 2 has a bottom plate 21 which has a rectangular shape in plan view and which is long in the front-rear direction, and a width direction extending upward from a side edge of the bottom plate 21 extending in the front-rear direction. A pair of side plates 22, a pair of front and rear plates 23, which are erected upward from side edges extending in the same width direction, and a top plate 24 supported by upper edges of these side plates 22 and the front and rear plates 23.
And the external shape is a rectangular parallelepiped. Top plate 2
4, a pair of brackets 25 in the width direction are erected at the front of
The upper frame 3 is supported by the lower frame 2 while being rotatably supported around the connecting shaft 26 between the pair of brackets 25.
It is connected to.

The top plate 24 of the lower frame 2 is provided with a receiving stand 27 protruding rearward from the rear edge, and the sheets P are read while being guided by the receiving stand 27. It is to be introduced into the device 1. A pair of widthwise edge dams 27a protrude from both side edges in the width direction of the receiving table 27, and the sheet P is controlled in such a manner that the movement of the sheet P in the width direction is restricted by the pair of edge dams 27a. To be properly introduced. Also, the top plate 24 of the lower frame 2 includes
A pair of rectangular elongated holes 24a in the front-rear direction extending in the width direction are formed.

The upper frame 3 is formed of a rectangular parallelepiped whose width is set slightly smaller than the gap between the brackets 25 and whose front and rear dimensions are set to be the same as those of the lower frame 2. I have. The upper frame 3 has a bottom plate 31 facing the top plate 24 of the lower frame 2.
A pair of side plates 32 in the width direction projecting upward from both side edges of the bottom plate 31; and a pair of front and rear plates 33 in the front and rear direction bridged between the front edge and the rear edge of the side plates 32.
And a top plate 34 covering the upper opening.

The upper frame 3 is rotatably supported around the connecting shaft 26 by inserting the connecting shaft 26 into the front ends of the pair of side plates 32, whereby the bottom plate of the upper frame 3 is A horizontal attitude 31 shown in FIG. 1 facing the top plate 24 of the lower frame 2 with a predetermined gap dimension,
The posture can be changed between an upright posture and an upright posture in a state of standing upright.

The upper frame 3 is a pair of rectangular long holes in the front-rear direction formed in the bottom plate 31 so as to face the rectangular long holes 24a of the pair of lower frames 2 in a state where the upper frame 3 is set in a horizontal posture. 31a. Further, a guide inclined plate 35 having an inclined surface corresponding to the receiving table 27 is provided on the front and rear plates 23 behind the upper frame body 3, and the sheets P are guided by the guide inclined plate 35 so that the sheets P can be removed. It can be easily inserted between both frames 2 and 3.

The upper frame 3 has a pair of hemispherical spacers 36 in the width direction protruding from the rear end of the bottom plate 31. When the upper frame 3 is set in a horizontal posture. When the pair of spacers 36 abut on the upper surface of the top plate 24 of the lower frame 2, a gap having a certain vertical dimension is formed between the top plate 24 of the lower frame 2 and the bottom plate 31 of the upper frame 3. I am trying to be.

The transporting means 4 is a pair of lower rollers (transporting rollers) which are housed in the lower frame 2 and whose upper portion only projects a predetermined length outward from the rectangular elongated hole 24a of the lower frame 2 to the outside. 41, and is installed in the upper frame body 3, and
A pair of upper rollers (auxiliary rollers) 42 in the front-rear direction, of which only the lower part protrudes outside from the rectangular slot 31a by a predetermined length,
A drive mechanism 43 for driving these rollers 41 and 42 to rotate is formed. Both the lower roller 41 and the upper roller 42 are formed of a flexible material such as rubber or soft synthetic resin. In the present embodiment, the pair of lower rollers 41 are set to have the same diameter, but instead of this, the lower roller 41 on the downstream side is used.
May be set slightly larger than the diameter of the lower roller 41 on the upstream side. By doing this,
When the rotation speeds of the upper and lower lower rollers 41 are the same, the peripheral speed of the downstream lower rollers 41
It becomes slightly larger than the peripheral speed of 1.

Each of the lower rollers 41 is a pair of lower horizontal shafts 41a in the front-rear direction bridged between the side plates 22 of the lower frame 2.
While being pivotally supported around each other,
Each of the upper rollers 42 is rotatably supported around a pair of upper horizontal shafts 42 a in the front-rear direction bridged between the side plates 32 of the upper frame 3. These horizontal shafts 41a,
42a is a state in which the upper frame 3 is set in a horizontal posture,
The set position is set so that the peripheral surface of the lower roller 41 and the peripheral surface of the upper roller 42 come into contact with each other.

The drive mechanism 43 includes a pair of driven pulleys 44 in the front-rear direction, which are rotatably supported coaxially and coaxially with the lower horizontal shafts 41a in the lower frame 2, and these driven pulleys 44.
An auxiliary pulley 45 provided therebetween, a driving pulley 46 provided outside the front of the lower frame 2,
3. An endless belt 47 bridged by a pair of driven pulleys 44 and an auxiliary pulley 45, and a drive motor 48 for rotating the drive pulley 46 around a drive shaft 48a. In the present embodiment, the pair of front and rear driven pulleys 44 have the same diameter.

The auxiliary pulley 45 is rotatably supported around an auxiliary shaft 45a bridged between the side plates 22 of the lower frame 2. The auxiliary pulley 45 is provided at a position where the forward belt stretched between the pair of driven pulleys 44 is pushed downward, whereby the contact area between the endless belt 47 and the driven pulley 44 is increased, so that the auxiliary pulley 45 is particularly positioned on the front side. The idle pulley 44 is prevented from idling.

According to the structure of the driving mechanism 43, FIG.
As shown in FIG. 5, by driving the drive motor 48, this rotation is transmitted to the pair of driven pulleys 44 via the drive shaft 48a, the drive pulley 46 and the endless belt 47, and the driven pulleys 44 Since the lower roller 41 integrated with the driven pulley 44 rotates in the same direction about the shaft 41a, it rotates in the same direction about the lower horizontal shaft 41a. And this rotation is performed when the peripheral surface is the lower roller 41.
Is transmitted to a pair of upper rollers 42 that are in contact with the peripheral surface of the upper roller 42, whereby each upper roller 42 rotates in the opposite direction to the lower roller 41.

Therefore, when the sheet P is inserted into the sheet insertion slot 10 through the receiving stand 27 while the driving motor 48 is rotated in the counterclockwise direction, the sheet P is
Moving the transport path 11 formed between the lower frame 2 and the upper frame 3 toward the downstream side while being engaged between the upper and lower rollers 41 and 42 that are rotating in contact with the upper and lower sides. become.

As shown in FIG. 3, the image sensor 5 has two types of light sources 52 (a first light source 52a and a second light source 52b) provided in a box-shaped casing 51 having an opening on the lower surface.
A lens member 53 containing a lens, and a light receiving unit 54
And the interior is configured. A glass plate (transparent plate) 55 is fitted into the lower opening of the casing 51, thereby sealing the inside of the casing 51. In addition,
The transparent plate is not limited to the glass plate 55, and may be any plate formed of a transparent material such as a transparent synthetic resin plate.

The first light source 52a and the second light source 52b
Represents that the projection light is reflected on the surface of the paper sheet P arranged opposite to the glass plate 55 and the reflected light is reflected on the lens member 53.
It is arranged and set to enter light. The reflected light that has passed through the lens member 53 is input to the light receiving unit 54 and converted into an electric signal. The electric signal is analyzed by a control unit (not shown) so that the authenticity of the paper sheet P is determined. Has become.

The image sensor 5 is held by the holding member 6 and mounted in a square hole 37 formed in the center of the bottom plate 31 of the upper frame 3, and the upper frame 3 is set in a horizontal posture. Paper sheet P in which the glass plate 55 is moving on the transport path 11
Are opposed to each other in a separated state.

As shown in FIG. 3, the holding member 6 has a bottom plate (cover) 61 whose longitudinal dimension is set slightly longer than that of the square hole 37, and is erected on the bottom plate 61. And a pair of support walls 62 (front and rear directions in FIG. 3). A light projecting hole 61a extending in the width direction (perpendicular to the plane of FIG. 3) is formed in the center of the bottom plate 61 so as to extend downward in the front-rear direction. The sheet P on the transport path 11 is irradiated through the sheet.

The distance between the support walls 62 in the front-rear direction is set slightly larger than the front-rear dimension of the image sensor 5, so that the image sensor 5 can be sandwiched and stored between the pair of support walls 62. Has become. Also,
Each support wall 62 has a locking claw 62a projecting in a direction facing each other at an upper end portion, and each locking claw 62a is attached to the image sensor 5 in a state where the image sensor 5 is held between the pair of support walls 62. The upper end of the image sensor 5 is locked so that the mounting state of the image sensor 5 to the holding member 6 is stabilized.

The bottom plate 61 has a flange portion 61b formed in a portion protruding forward and backward from each support wall 62, and each support wall 62 is formed from the lower surface of the upper frame 3 to the square hole 37. In the fitted state, as shown in FIG. 2, by screwing the flange portion 61 b to the bottom plate 31 of the upper frame 3, the holding member 6 with the image sensor 5 attached thereto is attached to the upper frame 3. Has become.

FIG. 4 is a partially enlarged view showing a main part of FIG. In the present invention, as shown in FIG. 4, the image sensor 5 is set at an installation position such that the glass plate 55 is separated from the original surface of the sheet P by a predetermined distance due to the presence of the bottom plate 61 of the holding member 6. Not only is set, but also the bottom plate 6 is set so that the bottom plate 61 itself does not interfere with the sheets P.
1 thickness dimension is set. Specifically, the thickness d2 of the bottom plate 61 of the holding member 6 is set to be smaller than the protrusion amount d1 of the upper roller 42 from the rectangular elongated hole 24a,
Thus, a gap d1-d2 (gap dimension d) is provided between the lower surface of the bottom plate 61 and the upper surface of the paper sheet P located on the transport path 11.
3) is formed.

In this embodiment, the clearance dimension d3
Is sized between 0.1 mm and 10.0 mm.
This range is set because the gap size d3 is 0.1 m
If the distance is less than m, the upper surface of the paper sheet P being conveyed, for example, is wavy, and the upper surface of the paper sheet P comes into contact with the lower surface of the bottom plate 61, so that printing on the upper surface of the paper sheet P is rubbed. And the gap dimension d3 is 1
If the distance exceeds 0 mm, the distance between the light source 52 or the lens member 53 and the upper surface of the paper sheet P becomes too long, and it becomes difficult to read the print properly.

As described in detail above, the present invention relates to paper sheets P
Means 4 for transporting the paper P along the transport path 11, and the transport means 4 emits light onto the original surface of the paper sheet P being transported, and reflects the reflected light on the upper surface (original surface) of the paper sheet P. And an image sensor 5 that reads an original by receiving light through the glass plate 55, and conveys the conveying means 4 so that the original surface of the sheet P passes over a certain plane from the upstream side to the downstream side of the image sensor 5. Since the paper sheet P is configured to be conveyed, and the glass plate 55 is set at a predetermined distance from the document surface of the paper sheet P, the paper sheet read by the image sensor 5 through the conveyance path 11 is set. The class P is conveyed in a state where the document surface faces the image sensor 5 and faces the front side, and is separated from the image sensor 5. Therefore, as compared with the related art in which the sheet P is conveyed while the original surface of the sheet P slides on the glass plate 55, the undried ink on the upper surface of the sheet P is transferred to the glass plate 55,
This transfer retransfers to the original surface and contaminates the original surface, thereby reliably preventing the inconvenience of the original being erroneously read by the image sensor 5.

The image sensor 5 is mounted on the holding member 6 having the bottom plate 61 provided with the light projecting hole 61a with the glass plate 55 being in close contact with the bottom plate 61, and the holding member loaded with the image sensor 5 is mounted. 6 is mounted on the upper frame 3, so that the bottom plate 61 ensures the separated state between the glass plate 55 and the document surface, thereby more reliably preventing the occurrence of erroneous input by the image sensor 5. be able to.

An upper frame 3 on which the image sensor 5 is mounted is provided, and the upper frame 3 is connected to the lower frame 2 so as to be rotatable around a connection shaft 26 and is connected to the lower frame 2. The posture can be changed between an opposed horizontal posture and an upright posture separated from the lower frame body 2, and the conveying means 4 is provided with a pair of upper and downstream lower rollers 41 provided inside the lower frame body 2, and an upper frame body 3. A pair of upper and downstream upper rollers 42, and a drive motor 48 for driving the upper rollers 42 to rotate.
By setting the position of the image sensor 5 so as to traverse the conveyance path 11 at a substantially intermediate position between the upstream side roller and the downstream side roller, the lower roller 41 on the upper and lower sides is driven and rotated by the driving of the driving motor 48. Lower frame 2 and upper frame 3
Is inserted into the conveyance path 11 in the frame from the upstream side of the conveyance path 11 formed between the paper path P and the paper P whose posture is set so that the document surface faces the upper frame 3. First, the paper path is moved toward the downstream side while being sandwiched between the rollers 41 and 42 on the upstream side, and the image sensor 5 reads the items on the original surface in the middle. And
When the leading end of the paper sheet P reaches the rollers 41 and 42 on the downstream side, the leading end side of the paper sheet P is sandwiched between these rollers 41 and 42, and the paper sheet P Since the paper P is transported along the transport path 11 by the rollers, the transport state of the paper sheet P is stabilized, and the reading of the written matter by the image sensor 5 is reliably performed without error.

Further, by supporting the image sensor 5 on the upper frame 3, it is possible to easily and surely secure a gap distance between the document surface of the sheet P being transported and the image sensor 5. become.

If the diameter of the lower roller 41 on the downstream side is set to be larger than the diameter of the lower roller 41 on the upstream side, the peripheral speed of the lower roller 41 on the downstream side is reduced. Faster than the peripheral speed of Therefore, the paper sheet P supplied to the transport path 11 is
When the front end reaches the downstream lower roller 41, the front end moves to the downstream lower roller 4.
1 and the upper roller 42 opposed thereto. In this state, the peripheral speed of the downstream lower roller 41 is higher than the peripheral speed of the upstream transport roller. The part is conveyed while being pulled forward. Accordingly, the document surface of the sheet P facing the image sensor 5 is in a state in which no curved surface is formed and is located on the same straight plane. Normal reading is performed, and erroneous reading can be reliably prevented.

The peripheral speed of the downstream lower roller 41 is reduced by a simple configuration in which the diameter of the lower roller 41 on the downstream side is set to be larger than the diameter of the lower roller 41 on the upstream side. It is possible to increase the peripheral speed of the roller 41, which is effective in reducing equipment costs.

As a measure to make the peripheral speed of the downstream lower roller 41 higher than the peripheral speed of the upstream lower roller 41, as described above, the diameter of the downstream lower roller 41 is changed to the diameter of the upstream transport roller. In addition to setting the size larger than the size, for example, the diameter of the pulley 44 of the lower roller 41 on the upstream side may be set smaller than that of the pulley 44 of the lower roller 41 on the upstream side, or Each of the lower roller 41 on the side and the lower roller 41 on the downstream side may be configured to be driven by a dedicated drive motor, and the rotation speed of each drive motor may be controlled.

[0051]

According to the sheet reading apparatus of the first aspect of the present invention, a conveying means for conveying a sheet along a conveying path, and a document surface of the sheet being conveyed by the conveying means. And an image sensor that reads the original by receiving the reflected light through a transparent plate facing the original surface, and the transporting means includes a sheet surface of the original from the upstream side to the downstream side of the image sensor. Transports the sheets so that they pass on a certain plane, and the image sensor is positioned so that the transparent plate is separated by a predetermined distance from the document surface of the sheets,
The document surface does not slidably contact other members including the platen roller, as compared with the conventional one in which the sheets are conveyed while being pressed against the platen roller while the document surface is in sliding contact with the transparent plate. If undried ink is present on the original surface of a sheet, the undried ink is transferred to the glass plate, and this transfer is re-transferred to the original surface and contaminates the original surface. It is possible to reliably prevent inconvenience such as erroneous reading by the sensor.

According to the paper sheet reading apparatus of the second aspect of the present invention, since the cover portion is provided around the transparent plate of the image sensor so as to protrude from the transparent plate toward the conveyance path with a constant thickness. , The distance between the transparent plate and the document surface can be ensured.

According to the paper sheet reading apparatus of the third aspect of the present invention, the first and second frames are moved between the first frame and the second frame while the transport rollers on the upstream and downstream sides are driven and rotated by the driving means. From the upstream side of the transport path formed in the above, the paper sheets are inserted into the transport path in the frame by setting the posture so that the document surface faces the second frame, so that the sheet is first transported upstream. The conveyance path moves toward the downstream side while being sandwiched between the roller and the auxiliary roller, and during this movement, the items described on the document surface can be read by the image sensor. When the leading end of the sheet reaches the downstream conveying roller, the leading end of the sheet is sandwiched between the downstream conveying roller and the auxiliary roller. Since the sheet is conveyed along the conveyance path by the rollers, the conveyance state of the sheet is stabilized, and the reading of the written matter by the image sensor can be reliably performed without error.

Further, by supporting the image sensor on the second frame, the gap distance between the original document surface of the paper sheet being conveyed and the image sensor can be easily and reliably ensured. Adjustment of the distance can be easily performed.

According to the sheet reader of the fourth aspect of the present invention, the first frame and the second frame are connected to each other so as to be relatively rotatable around the connection axis. By rotating the two frames around the connection axis in a direction away from each other, the frames are opened from each other, so that maintenance of the reader can be easily performed.

According to the paper sheet reading apparatus of the fifth aspect of the present invention, since the peripheral speed of the downstream conveying roller is set to be higher than the peripheral speed of the upstream conveying roller, the paper sheet is read. The document is conveyed while the downstream portion is pulled forward, and the surface of the document facing the image sensor of the paper sheet is located on the same straight plane without a curved surface, and the document is Reading is always normally performed by the image sensor, and erroneous reading can be reliably prevented.

According to the paper sheet reading apparatus of the sixth aspect of the present invention, the downstream transport roller is dimensioned such that the diameter is larger than the diameter of the upstream transport roller.
For example, when the upstream conveying roller and the downstream conveying roller are connected by an endless belt via a predetermined pulley and are rotated at the same rotational speed, the peripheral speed of the downstream conveying roller having a large diameter is set to be larger than that of the upstream conveying roller. Can be faster. As described above, the simple configuration in which the low dimension of the roller is different between the upstream side and the downstream side enables the peripheral speed of the downstream transport roller to be higher than the peripheral speed of the upstream transport roller, thereby reducing equipment costs. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a paper sheet reader according to the present invention, and shows a state in which a second frame is overlaid on a first frame.

FIG. 2 is a perspective view of the paper sheet reading apparatus of FIG.
The state where it was separated from the frame is shown.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a partially enlarged view showing a main part of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper sheet reading device 10 paper sheet insertion slot 11 transport path 2 lower frame 21 bottom plate 22 side plate 23 front and rear plate 24 top plate 24 a rectangular long hole 25 bracket 26 connecting shaft 27 receiving stand 27 a edge dam 3 upper frame 31 bottom plate 32 Side plate 33 Front and rear plate 34 Top plate 35 Guide inclined plate 36 Spacer 37 Square hole 4 Transport means 41 Lower roller 41a Lower horizontal shaft 42 Upper roller 43 Drive mechanism 44 Followed pulley 45 Auxiliary pulley 46 Drive pulley 47 Endless belt 48 Drive motor 48a Drive Axis 5 Image sensor 51 Casing 52 Light source 52a First light source 52b Second light source 53 Lens member 54 Light receiving unit 55 Glass plate 6 Holding member 61 Bottom plate 61a Light emitting hole 61b Flange portion 62 Support wall 62a Locking claw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisato Torii 2-3-15 Nishiwaki, Hirano-ku, Osaka City Inside Nippon Cash Machine Co., Ltd. (72) Inventor Ken Murai 2-3-1-15 Nishiwaki, Hirano-ku, Osaka City No. Japan Money Machinery Co., Ltd. (72) Inventor Haru Iwasaki 2-3-15 Nishiwaki, Hirano-ku, Osaka-shi Japan Money Machinery Co., Ltd. F term (reference) 3E041 AA03 AA10 BB03 EA03 EA05 5B047 AA01 BA01 BB02 BC05 BC11 BC18 5C072 AA01 BA20 CA02 DA02 DA21 NA01 NA10

Claims (6)

[Claims] 1. A sheet reading apparatus for reading a document described on a document surface of a sheet, a conveying unit for conveying the sheet along a conveying path, and a conveying unit for conveying the sheet along the conveying path. An image sensor for reading the original by projecting light onto the original surface of the paper sheet and receiving the reflected light through a transparent plate facing the original surface; and The image sensor is positioned so that the transparent plate is separated by a predetermined distance from the document surface of the sheet. A sheet reader. 2. Around the transparent plate of the image sensor,
2. The sheet reader according to claim 1, further comprising a cover portion having a constant thickness and protruding from the transparent plate toward the transport path. 3. A frame for mounting the transporting means and the image sensor is provided. The frame includes a first frame supporting the transporting means, a frame facing the first frame, and A second frame for supporting the sensor, wherein the transport path is formed between the first frame and the second frame, and the transport means includes a peripheral surface on an upstream side and a downstream side of the first frame. And a pair of rollers are rotationally driven by an upstream-side transport roller and a downstream-side transport roller, which are positioned so that a part of the roller is immersed in the transport path, and rotatably supported around an axis perpendicular to the transport direction. Driving means, and a pair of auxiliary rollers provided on the second frame so that the peripheral surfaces abut against the peripheral surfaces of the pair of rollers, and rotatably supported around an axis orthogonal to the transport direction. The image sensor is configured to include the upstream side and 3. The paper sheet reading apparatus according to claim 1, wherein the paper sheet reading apparatus is provided so as to cross the conveyance path at a substantially intermediate position of the downstream roller. 4. The sheet reader according to claim 3, wherein the first frame and the second frame are connected so as to be relatively rotatable around a connection axis. 5. The paper sheet reading apparatus according to claim 3, wherein a speed of the downstream transport roller is set such that a peripheral speed thereof is higher than a peripheral speed of the upstream transport roller. 6. The sheet reader according to claim 5, wherein the downstream transport roller is dimensioned such that the diameter dimension is larger than the diameter dimension of the upstream transport roller.