JP2011035502A - Optical reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical reader capable of suppressing variations in height of glass surface with respect to a conveying surface, and preventing read defect and conveying defect of a medium. <P>SOLUTION: In the optical reader including an optical read portion for optically reading a surface of the medium in a conveying path of the medium, the optical read portion includes a frame member and a cover glass which are extended in the width direction of the conveying path and configure a part of the conveying surface of the conveying path. The frame member is provided with a glass support portion for supporting the cover glass. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical reading device including an optical reading unit that optically reads a medium conveyed along a conveyance path.

  2. Description of the Related Art Conventionally, in an optical reading device such as a copying machine or a scanner device, a reading unit that optically reads the surface of the medium is provided in a conveyance path through which the medium (object to be read) is conveyed. A medium that is transported by a transport unit configured by the above-described method, and the medium is pressed against the reading unit to read the medium in close contact with the cover glass of the reading unit is known (for example, see Patent Document 1). .

JP 2009-124660 A

By the way, in this type of optical reader, it is important to manage the height of the conveyance surface of the conveyance path and the surface of the cover glass (glass surface). However, in the conventional configuration, since the ready-made reading unit is incorporated and fixed in a fixing member provided in the conveyance path, the height of the glass surface with respect to the conveyance surface varies due to individual differences, and reading errors in the reading unit and the medium There is a possibility that a problem such as paper conveyance failure (for example, paper breakage or paper jam) may occur.
Accordingly, an object of the present invention has been made in view of the above-described circumstances, and provides an optical reading apparatus capable of suppressing a variation in the height of the glass surface with respect to the conveyance surface and preventing a medium reading defect and a conveyance defect. It is in.

In order to achieve the above object, the present invention provides an optical reading device including an optical reading unit that optically reads the surface of the medium in a medium conveyance path, wherein the optical reading unit extends in a width direction of the conveyance path. And a frame member that constitutes a part of the conveyance surface of the conveyance path and a cover glass, and a glass support portion that supports the cover glass is provided on the frame member.
According to this configuration, by providing the glass support portion that supports the cover glass on the frame member that constitutes a part of the conveyance surface of the conveyance path, it is possible to suppress variation in the height of the surface of the cover glass with respect to the conveyance surface. As a result, it is possible to prevent poor reading and conveyance of the medium.

  In this configuration, the frame member may integrally include a guide member that guides the medium to the cover glass. According to this configuration, the medium can be smoothly guided to the cover glass by the guide member, and the reading failure and the conveyance failure of the medium can be prevented.

  In addition, the guide portion may be configured to have an inclined surface that is inclined downward as the distance from the cover glass increases and scoops up the medium transported along the transport path. According to this configuration, when the medium is transported, the inclined surface scoops up the medium and smoothly guides it to the cover glass. Therefore, it is possible to prevent the medium from being poorly read and transported.

  Further, the edge part of the guide part on the cover glass side and the edge part of the cover glass are each chamfered to scoop up the medium conveyed from one of the guide part or the cover glass to the other. It is good also as composition which has. According to this configuration, when the medium is transported from one side of the guide part or the cover glass to the other side, the leading edge of the medium is scooped up by chamfering, so that the leading edge is prevented from coming into contact with the guide part or the cover glass. Further, it is possible to prevent the conveyance failure of the medium.

Further, the optical reading units are arranged opposite to each other above and below the transport path, and the frame members of the optical reading units are provided with contact portions that contact each other and hold a gap between the cover glasses at a predetermined distance. It is good also as a structure currently provided. According to this configuration, since the frame member is provided with the contact portion, the height variation between the cover glass and the contact portion can be suppressed. The gap between the glasses can be suppressed and the gap can be held at a predetermined distance, and the reading failure and the conveyance failure of the medium can be prevented.

  According to the present invention, by providing the glass support portion that supports the cover glass on the frame member that constitutes a part of the transport surface of the transport path, it is possible to suppress variation in the height of the surface of the cover glass with respect to the transport surface. As a result, it is possible to prevent poor reading and conveyance of the medium.

1 is an external perspective view of a dot impact printer in an embodiment. FIG. 2 is a perspective view showing a printer body. FIG. 3 is a side sectional view of the printer body. It is a sectional side view of the 2nd scanner. It is the elements on larger scale of FIG. It is the sectional side view which cut | disconnected the optical reader in the longitudinal direction.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front perspective view showing an appearance of a dot impact printer as a recording apparatus according to the present embodiment. FIG. 2 is an external perspective view showing the printer main body 11. FIG. 3 is a side sectional view showing the dot impact printer 10 of FIG.
The dot impact printer 10 shown in FIG. 1 has a recording medium via an ink ribbon (not shown) in which a plurality of recording wires provided in a recording head (recording means) 18 (see FIG. 3) are fed from a ribbon cartridge (not shown). An image including characters is recorded by pressing the (medium) S and forming dots on the recording surface of the recording medium S. Further, the dot impact printer 10 has an optical reading device 110 (see FIG. 3), and the optical reading device 110 can read characters, symbols, images and the like displayed on the surface of the recording medium S.

Examples of the recording medium S that can be used in the dot impact printer 10 include a cut medium cut to a predetermined length and a continuous sheet in which a plurality of sheets are connected. As the cut medium, for example, there are a passbook, a postcard, an envelope, and the like in addition to a cut paper and a cut copy paper, and the continuous paper includes continuous copy paper.
In this embodiment, a check or bill issued by a financial institution or the like (hereinafter collectively referred to as a check) or a passbook issued by a financial institution or the like is used as the recording medium S. A check is a single-cut sheet in which MICR (Magnetic Ink Character Recognition) information such as a user's account number and a serial number of the check is printed on a partial area MA of the surface by magnetic ink. The passbook is in the form of a booklet in which a plurality of recording sheets are bound, and the inner surface of the booklet is the recording surface. A magnetic stripe is provided at the rear of the surface corresponding to the back cover of the passbook.
In the following description, of the four sides of the rectangular recording medium S, the side that is inserted toward the dot impact printer 10 is the front end, and the side that faces the front end is the rear end.

As shown in FIG. 1, the dot impact printer 10 includes an upper cover 12, an upper case 13, and a lower case 14 as exterior bodies, and a recording medium S is inserted into or discharged from the front surfaces of the upper case 13 and the lower case 14. A manual feed opening 15 is opened. The side where the manual feed opening 15 is opened, that is, the left side in FIG. 3 is the front (front) side, and the right side in FIG. 3 is the rear (rear) side.
As shown in FIG. 2, the dot impact printer 10 includes a printer main body 11 covered with an upper cover 12, an upper case 13, and a lower case 14. The printer main body 11 includes a lower main body portion 11A and an upper main body portion (not shown) supported by a shaft 11C at the rear end portion of the lower main body portion 11A. The upper main body is rotated by an operation of an open / close lever (not shown) provided on the left side surface of the upper main body to expose the inside of the printer main body 11.

As shown in FIGS. 2 and 3, the printer main body 11 includes a base frame 16, and a right side frame 17 </ b> A and a left side frame 17 </ b> B that are erected and fixed to both ends of the base frame 16. Outside the two side frames 17A and 17B are both side frames (not shown) of the upper main body, and a carriage guide shaft 31 is bridged between them, and a flat surface shape is formed between the side frames 17A and 17B. The front medium guide 24 and the rear medium guide 25 are fixedly provided. A planar platen 21 is disposed between the front medium guide 24 and the rear medium guide 25, and the recording head 18 is disposed above the platen 21 so as to face the platen 21.
The recording head 18 is mounted on a carriage 19 that is slidably inserted into the carriage guide shaft 31. The carriage 19 is driven via a timing belt (not shown) by forward or reverse rotation of a carriage drive motor (not shown) that drives the carriage 19, and is reciprocated by being guided by a carriage guide shaft 31.
The movement direction of the carriage 19 is the main scanning direction that coincides with the direction indicated by the symbol X in FIG. 1, that is, the axial direction of the carriage guide shaft 31 and the longitudinal direction of the platen 21. In addition, the movement (scanning) range of the carriage 19 is between a pair of upper main body side frames. Note that a direction orthogonal to the main scanning direction X of the carriage 19, that is, a direction indicated by a symbol Y in FIG.

  While the recording head 18 mounted on the carriage 19 travels in the main scanning direction together with the carriage 19, the recording wire protrudes from a wire protruding portion (not shown) facing the platen 21 at the front end surface thereof to form an ink ribbon. The ink of the ink ribbon is applied to the recording medium S transported between the platen 21 and the recording head 18 to record an image including characters on the recording medium S. The ink ribbon is folded and stored in a ribbon cartridge (not shown) mounted on the main body frame or the carriage 19 and is fed out as the carriage 19 is scanned. Further, as shown in FIG. 3, a medium width sensor 55 is disposed on the rear side of the recording head 18 so as to be positioned above the platen 21. The medium width sensor 55 is mounted on the carriage 19 and scanned on the platen 21 together with the carriage 19, and is used to obtain the position of the side edge of the recording medium S and the width of the recording medium S.

  As shown in FIGS. 2 and 3, the platen 21 is formed in a planar shape extending in the traveling direction of the carriage 19, and both ends thereof are urged toward the recording head 18 by the urging spring 41. It is elastically supported. The urging spring 41 is a compression coil spring, and the urging force of the urging spring 41 supports the projecting output of the recording wire during the recording operation of the recording head 18. Further, the platen 21 is attached to the biasing spring 41 when the thickness of the recording medium S changes during the conveyance of the recording medium S or when the recording medium S having a different thickness is carried into the printer main body 11. The head is pressed by the tip of the recording head 18 against the force and moves away from the recording head 18. Thus, a constant gap is ensured between the tip of the recording head 18 and the recording surface of the recording medium S regardless of the thickness of the recording medium.

  As shown in FIG. 3, the printer main body 11 has a medium conveying mechanism (conveying means) 100 that conveys the recording medium S and the leading end of the recording medium S that is conveyed by the medium conveying mechanism 100 abutted against the recording medium. An alignment mechanism 28 for aligning S; and a magnetic data reading unit 29 including a magnetic head 34 for reading MICR information provided on a check and reading or writing magnetic information on a magnetic stripe provided on a passbook; The magnetic head 34 of the magnetic data reading unit 29 has a medium pressing unit 30 for pressing the recording medium S from above to suppress the floating of the recording medium S when performing magnetic information processing including reading of MICR information. is doing.

As shown in FIGS. 2 and 3, the medium transport mechanism 100 includes a platen 21, a first driving roller 22A, a first driven roller 22B, a second driving roller 23A, a second driven roller 23B, a third driving roller 124A, 3 a driven roller 124B, a front medium guide 24, a rear medium guide 25, a medium transport motor 26, and a drive wheel train 27. In this configuration, the medium transport mechanism 100 includes a transport path P that transports the recording medium S via each roller on the front medium guide 24 and the rear medium guide 25, and the front medium guide 24 and the rear medium guide 25 The upper surface functions as a transport surface PA of the transport path P.
In this configuration, the first drive roller 22A and the first driven roller 22B are arranged on the front side of the printer body 11 with respect to the platen 21 and the recording head 18, and the second drive roller 23A, the second driven roller 23B, and the third The driving roller 124 </ b> A and the third driven roller 124 </ b> B are sequentially arranged on the rear side of the printer main body 11 with respect to the platen 21 and the recording head 18.

The first driving roller 22A and the first driven roller 22B are arranged in a vertical direction to make a pair, and the second driving roller 23A and the second driven roller 23B are arranged in a vertical direction to make a pair, a third The driving roller 124A and the third driven roller 124B are arranged in the vertical direction to make a pair.
The first driving roller 22A, the second driving roller 23A, and the third driving roller 124A are driving rollers that are rotationally driven by the medium transport motor 26 and the driving wheel train 27, and are a first driven roller 22B and a second driven roller 23B. And the third driven roller 124B are respectively driven by the springs 42A, 42B, and 42C with a predetermined pressing force toward the first drive roller 22A, the second drive roller 23A, and the third drive roller 124A. It is. Accordingly, the first driving roller 22A and the first driven roller 22B are rotationally driven in opposite directions, the second driving roller 23A and the second driven roller 23B are rotationally driven in opposite directions, and the third driving roller 124A. And the third driven roller 124B are rotationally driven in directions opposite to each other.

  As shown in FIG. 2, the drive wheel train 27 is disposed outside the right side frame 17A. The drive wheel train 27 includes a motor pinion 51 that is rotatably and integrally fixed to a drive shaft of a medium transport motor 26 that can rotate forward or reverse. The driving force from the motor pinion 51 is transmitted to the second driving gear 53B attached to the second roller shaft 33 of the second driving roller 23A via the reduction gear 52, and further from the second driving gear 53B to the middle. It is transmitted to the first drive gear 53A attached to the first roller shaft 32 of the first drive roller 22A via the gear 54. Further, the rotational force of the second roller shaft 33 of the second drive roller 23A is transmitted to the third roller shaft 134 of the third drive roller 124A by, for example, a drive belt (not shown). Accordingly, the first drive roller 22A, the second drive roller 23A, and the third drive roller 124A shown in FIG. 3 rotate in the same direction, and the recording medium S can be conveyed into the printer main body 11. In other words, the first drive roller 22A, the second drive roller 23A, and the third drive roller 124A shown in FIG. 3 are denoted by reference sign A in the drawing along the sub-scanning direction when the medium transport motor 26 is rotating forward. When the recording medium S is transported into the printer main body 11 and the medium transport motor 26 is reversely rotated, the recording medium S is transported in the direction of discharging from the printer main body 11 as indicated by reference numeral B in the figure. To do.

  The alignment mechanism 28 aligns the recording medium S before recording on the recording medium S by the recording head 18 or reading the surface of the recording medium S by the optical reading device 110. The alignment mechanism 28 is provided between the first drive roller 22A and the first driven roller 22B, the recording head 18 and the platen 21, and a plurality (eight in this embodiment) of alignment plates protruding into the conveyance path P. (Alignment member) 38 and an alignment plate motor (not shown) for driving the alignment plate 38 are provided. As shown in FIG. 2, the plurality of alignment plates 38 are juxtaposed in the width direction of the transport path P (main scanning direction of the carriage 19), and the leading end portion of the recording medium S abuts against these alignment plates 38. Thus, the direction of the recording medium S can be changed and the recording medium S can be aligned.

Further, as shown in FIG. 2, the printer main body 11 includes a plurality of medium detection sensors 39 that detect the presence or absence of the recording medium S abutted against the alignment plate 38 in the vicinity of the upstream side of the alignment plate 38 in the transport path P. Is provided. The medium detection sensor 39 is a light transmission type sensor that includes a light emitting unit (such as an LED) and a light receiving unit (such as a phototransistor) that face each other across the transport path P, and light emitted from the light emitting unit is received. The presence or absence of the recording medium S is detected based on whether the light is received by the recording unit or shielded by the recording medium S.
Since the medium detection sensors 39 are arranged along the alignment plate 38 so as to be substantially equally spaced, the recording after alignment by the alignment plate 38 is performed based on each output (detection result) of the medium detection sensor 39. It can be determined whether or not the inclination of the medium S with respect to the transport direction is within an allowable inclination range. For example, if two adjacent media detection sensors 39 arranged in the width direction of the transport path P (main scanning direction of the carriage 19) simultaneously detect the recording media S, it is determined that the alignment is completed.
Further, the dot impact printer 10 includes the drive control of the medium transport motor 26, the travel control of the carriage 19, the control of the recording operation by the recording wire of the recording head 18, the control of the reading operation of the optical reader 110, etc. As a control unit for controlling the whole, for example, a control board unit (not shown) is provided below the rear side of the printer main body 11.

  Further, as shown in FIG. 2, the printer main body 11 includes a plurality (four in the present embodiment) of insertion detection sensors that detect the insertion of the recording medium S into the conveyance path P on the front side of the first drive roller 22 </ b> A. 47 are arranged side by side. These insertion detection sensors 47 are light reflection sensors each including a light emitting unit that emits light toward the transport path P and a light receiving unit that detects the reflected light. As the insertion detection sensor, a light transmission type sensor in which a light emitting unit and a light receiving unit are arranged so as to face each other with the conveyance path P therebetween may be used. In this configuration, when the light receiving portions of all the insertion detection sensors 47 receive light from one of the insertion detection sensors 47 from the received light state, the recording medium S is inserted into the transport path P. To be judged.

  Further, as shown in FIG. 3, the printer main body 11 includes an optical reading device 110 that reads characters, symbols, images, or the like displayed on the surface of the recording medium S. The optical reading device 110 is disposed opposite to the first scanner 111 (optical reading unit) 111 that reads information displayed by printing or the like on the upper surface side of the recording medium S. A second scanner (optical reading unit) 112 that reads information displayed by printing or the like on the lower surface side; The first scanner 111 and the second scanner 112 are disposed between the second drive roller 23A and the third drive roller 124A, and optical image sensors that continuously read information on the recording medium S that is being transported along the transport path P. It is. The first scanner 111 and the second scanner 112 are, for example, CIS (Contact Image Sensor) type image reading sensors, and hold flat cover glasses 140 and 150 that are in close contact with the recording medium S, and these cover glasses 140 and 150. Main body cases 141 and 151 respectively. Inside the main body cases 141 and 151, an irradiation unit (not shown) for irradiating light output from a light source such as an LED to the reading area of the recording medium S, and a line in the main scanning direction (X direction). A plurality of light receiving sensors (not shown) arranged and an output part (not shown) for outputting a signal from the light receiving sensor to the control board part are accommodated. In the present embodiment, the CIS type is used as the first scanner 111 and the second scanner 112, but a CCD (Charge Coupled Device) type optical image sensor may be used.

As shown in FIG. 2, the second scanner 112 includes a main body case 151 and a cover glass 150 that extend in the width direction of the dot impact printer 10 substantially in parallel with the platen 21 and have a longitudinal shape. 151 is arranged such that the upper surface (glass surface) of the cover glass 150 is exposed to the transport path P through an opening formed in the rear medium guide 25.
As shown in FIG. 3, the first scanner 111 is provided above the second scanner 112 so that the lower surface (glass surface) of the cover glass 140 faces the upper surface of the cover glass 150. The two scanners 112 are formed in a longitudinal shape substantially the same length.
A biasing member 113 is provided above the first scanner 111, and the first scanner 111 is biased by the biasing member 113 so as to be close to the recording medium S of the rear medium guide 25. Further, the urging member 113 presses the first scanner 111 against the second scanner 112 side with a substantially uniform force in the width direction. Here, as the urging member 113, a coil spring, a leaf spring, an elastic elastomer, or the like can be used.
In addition, a space where a recording medium having a predetermined thickness can enter is provided between the glass surfaces of the cover glasses 140 and 150. When the recording medium S is read, the first recording medium S is conveyed by the conveyed recording medium S. When the scanner 111 is pushed upward and the urging member 113 contracts, the recording medium S can pass between the cover glasses 140 and 150. That is, in the optical reading device 110, the recording medium S and the glass surfaces of the cover glasses 140 and 150 are pressed by pressing the recording medium S against the second scanner 112 side by the first scanner 111 biased by the biasing member 113. It is firmly attached to improve reading quality.

Next, the configuration of the scanner will be described. FIG. 4 is a side sectional view of the second scanner 112 taken along the recording medium S conveyance direction.
As described above, the second scanner 112 includes the cover glass 150 and the main body case 151. The main body case 151 is arranged below the frame member 152 and the frame member 152 as shown in FIG. The holder 153 is assembled.
The holder 153 is formed in a tray shape having an open upper surface and is fixed to the base frame 16 (see FIG. 3). A substrate 154 is supported below the frame member 152. The substrate 154 has an irradiation unit that irradiates the reading area of the recording medium S with light output from a light source such as the LED, and a main scanning direction (X A plurality of light receiving sensors arranged in a line in the direction) and an output unit for outputting a signal from the light receiving sensor to the control board unit are mounted.

On the other hand, as shown in FIG. 4, the frame member 152 includes a frame body portion 155 that is formed in a rectangular frame shape with an upper surface and a bottom surface opened, and a cover glass 150 is provided at an upper edge portion of the frame body portion 155. A glass support portion 156 that supports the cover glass 150 is formed. Further, the frame body portion 155 includes a plurality of paper guide portions (guide portions) extending from the pair of upper edge portions extending in the longitudinal direction of the frame body portion 155 in the main scanning direction (X direction) at intervals. ) 157 are integrally formed. The paper guide portion 157 includes a horizontal plane 157A positioned above the rear medium guide 25 and an inclined surface 157B inclined from the horizontal plane 157A toward the rear medium guide 25. The inclined surface 157B scoops up the recording medium S. Functions as a rake face. Thereby, when the recording medium S is transported, the inclined surface 157B scoops up the recording medium S and smoothly guides it to the cover glass 150, so that it is possible to prevent the recording medium S from being read and transported.
Further, a portion of the horizontal surface 157A and the inclined surface 157B located above the rear medium guide 25 functions as the transport surface PA. Thereby, the frame member 152 is configured such that a part of the frame member 152 is a part of the transport surface PA. Further, the lower surface of the paper guide portion 157 is placed and held on the side surface portion of the holder 153.
Further, the edge of the paper guide portion 157 on the cover glass 150 side and the edge of the cover glass 150 are used to scoop up the recording medium S conveyed from one of the paper guide portion 157 or the cover glass 150 to the other. C surface (chamfering) processing is performed. For this reason, when the recording medium S is conveyed, the front end of the recording medium S is prevented from coming into contact with the side end portions of the paper guide portion 157 and the cover glass 150, and the medium between the paper guide portion 157 and the cover glass 150 is prevented. Smooth transport is possible.

On the other hand, the lower edge portion of the frame body portion 155 of the frame member 152 includes a leg portion 158 formed along the outer periphery of the frame body portion 155 and a step portion 159 formed inside the leg portion 158. The step portion 159 is formed at a height corresponding to the thickness of the substrate 154 described above, and the substrate 154 is held by the step portion 159. Thus, in this embodiment, since the cover glass 150 and the substrate 154 are supported by the frame member 152, the distance between the cover glass 150 and the substrate 154 can be accurately managed, and the recording medium S Can improve the reading accuracy.
The substrate 154 can be held between the step portion 159 and the bottom surface of the holder 153, and the substrate 154 can be easily attached and fixed.
Further, the first scanner 111 has substantially the same configuration as the second scanner 112 except that the first scanner 111 and the second scanner 112 are reversed upside down.

By the way, in order to accurately and smoothly carry and read the medium, the height between the horizontal surface 157A of the paper guide portion 157 and the surface (glass surface) 150A of the cover glass 150, which is the conveyance surface PA of the conveyance path P. Management is important.
In the conventional configuration, since the ready-made scanner device is assembled and fixed to a fixing member provided in the conveyance path P, and a paper guide portion is formed on the fixing member, the tolerance of each member is between the horizontal surface 157A and the glass surface 150A. It had a great influence on height management.
Specifically, as shown in FIG. 5, in the conventional configuration, even when the design is performed under a predetermined design condition, for example, when the worst condition by the Monte Carlo method is calculated by the individual difference of each member, the cover glass Since the glass surface 150A of 150 rises to the glass surface 150A1 indicated by the alternate long and short dash line, the horizontal plane 157A of the paper guide portion 157 descends to the horizontal plane 157A1 indicated by the alternate long and short dashed line, and thus the height of the horizontal plane 157A1 and the glass surface 150A1 in this case The height H1 was much smaller than the design value. For this reason, when paper is transported under these conditions, there is a risk of poor reading with the scanner, or transport failure such as paper breakage or paper jam.

  On the other hand, in this embodiment, since the glass support part 156 that supports the cover glass 150 is provided on the frame member 152 in which the paper guide part 157 constituting a part of the transport surface PA is integrally formed, It is possible to reduce the factor causing the tolerance as compared with the above configuration. For this reason, even if the worst condition by the Monte Carlo method is calculated under the same design conditions, the glass surface 150A of the cover glass 150 only rises to the glass surface 150A2 indicated by the two-dot chain line, and the horizontal surface 157A and the glass surface 150A2 The height H2 can be maintained at an appropriate value larger than the above-described conventional height H1. For this reason, the variation in the height of the glass surface 150A with respect to the horizontal surface 157A of the paper guide portion 157 constituting a part of the conveyance surface PA can be suppressed, and as a result, the reading failure of the recording medium S by the second scanner 112 can be prevented. The recording medium S can be smoothly transported and paper breakage and paper jam during transport can be prevented.

FIG. 6 is a sectional side view of the optical reading device 110 cut in the longitudinal direction. In FIG. 6, reference numeral 142 denotes a frame member, 143 denotes a holder, and 146 denotes a glass support.
In the present embodiment, as shown in FIG. 6, the first scanner 111 and the second scanner 112 extend vertically from both end portions of the frame members 142 and 152, and contact pieces (contact portions) that contact each other. 142A, 152A. These contact pieces 142A and 152A are formed integrally with the frame members 142 and 152, and variations in the height H3 between the contact pieces 142A and 152A and the glass surfaces 140A and 150A can be reduced.
According to this, when the first scanner 111 and the second scanner 112 are arranged, the contact pieces 142A and 152A of the frame members 142 and 152 are brought into contact with each other, so that the gap G between the cover glasses 140 and 150 is reduced. The gap G can be held at a predetermined distance while suppressing variations. For this reason, it is possible to prevent the reading failure of the recording medium S by the first scanner 111 and the second scanner 112, and it is possible to smoothly transport the recording medium S between the cover glasses 140 and 150. The occurrence of paper jam can be prevented.

Although one embodiment of the present invention has been described above, the present invention is not limited to this. In the above embodiment, the dot impact printer 10 has been described. However, the present invention is not limited to this. For example, an ink jet printer or a thermal printer that records an image by heating a thermal medium may be used.
Furthermore, it is not limited to a device used as an independent printer such as the dot impact printer 10, but may be incorporated in other devices (ATM (Automated Teller Machine), CD (Cash Displacer), etc.) Applicable to various devices.

  DESCRIPTION OF SYMBOLS 10 ... Dot impact printer (recording apparatus), 11 ... Printer main body, 18 ... Recording head (recording means), 100 ... Medium conveyance mechanism (conveyance means), 110 ... Optical reader, 111 ... 1st scanner (optical reading part) 112, second scanner (optical reading unit), 140, 150 ... cover glass, 140A, 150A ... surface (glass surface), 142, 152 ... frame member, 142A, 152A ... contact piece (contact part) 146, 156 ... Glass support part, 147,157 ... Paper guide part (guide part), P ... Conveyance path, PA ... Conveyance surface, S ... Recording medium (medium).

Claims (5)

In an optical reading device including an optical reading unit that optically reads the surface of the medium in a medium conveyance path,
The optical reading unit includes a frame member and a cover glass that extend in the width direction of the transport path and constitute a part of the transport surface of the transport path, and a glass support that supports the cover glass on the frame member An optical reader characterized by comprising a section.   The optical reading apparatus according to claim 1, wherein the frame member is integrally provided with a guide portion that guides the medium to the cover glass.   The optical reading device according to claim 2, wherein the guide portion is formed with an inclined surface that is inclined downward as the distance from the cover glass increases and scoops up the medium conveyed along the conveyance path. .   A chamfering process for scooping up the medium conveyed from one side of the guide part or the cover glass to the other side is performed on the edge part of the guide part on the cover glass side and the edge part of the cover glass, respectively. The optical reading device according to claim 2, wherein:   The optical reading units are arranged opposite to each other above and below the conveyance path, and the frame members of the respective optical reading units are provided with contact portions that contact each other and hold a gap between the cover glasses at a predetermined distance. The optical reading apparatus according to claim 1, wherein the optical reading apparatus is provided.

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