JP2006078366A - Rotation amount detector, medium carrier, and recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation amount detector for highly accurately detecting a rotation amount of a detection roller by a detection means, a medium carrier equipped with the amount detector, and a recorder. <P>SOLUTION: A shaft end of a shaft 232 of the detection roller 230 is formed so as to have an inducing part 232a of a gradually broadening shape, with a fit-in hole 251a not inclined with respect to a shaft radius direction when fitting a rotary encoder scale 251 of a detection means 250. Since the center axis of the detection roller can be thereby made to coincide with the center axis of the detection means, the rotation amount of the detection roller can be highly accurately detected by the detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotation amount detection device that detects a rotation amount of a detection roller, a medium conveyance device including the rotation amount detection device, and a recording apparatus.

  A printer, which is one of the recording apparatuses, is provided with a sheet conveying device including a driving roller that conveys a sheet as a recording medium. The paper conveying device is provided with a rotary encoder that detects the amount of rotation of the drive roller. This rotary encoder includes a rotary encoder scale made of a disk-shaped plastic plate, an optical sensor made up of a light emitting / receiving element for detecting a slit portion of the rotary encoder scale, a circuit board connected to the optical sensor, and the like. A hole having a diameter slightly smaller than the diameter of the drive roller is formed at the center of the rotary encoder scale. The rotary encoder scale is attached with the center hole fitted into the shaft end of the drive roller.

JP-A-7-304222

  Since the drive roller of the above-described sheet conveying device has a shaft end formed in a columnar shape, an excessive force may be applied to the center hole when the rotary encoder scale is inserted. In such a case, the center axis of the drive roller and the center axis of the rotary encoder scale may be misaligned, and the detection accuracy of the rotation amount of the drive roller is deteriorated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotation amount detection device capable of detecting the rotation amount of the detection roller with high accuracy by a detection means, and the rotation amount detection device. Another object of the present invention is to provide a medium transport device and a recording device.

  To achieve the above object, the rotation amount detection device of the present invention is a rotation amount detection device comprising a rotatable detection roller and a detection means that is fitted on the shaft end side of the detection roller and detects the rotation amount. The shaft end of the detection roller is characterized in that the insertion hole is not inclined with respect to the axial diameter direction when the detection means is inserted, and is formed so as to gradually expand. As a result, the center axis of the detection roller can coincide with the center axis of the detection means, so that the rotation amount of the detection roller can be detected with high accuracy by the detection means.

  The shaft end of the detection roller is characterized in that a guide portion having a shape whose diameter gradually changes from the shaft end surface is provided. Thereby, the insertion hole of a detection means can be expanded reasonably. The guiding portion is formed in a tapered shape. The taper shape has a taper angle equal to or less than an angle determined by a difference between a radius of the detection roller and a radius of the insertion hole and a thickness of the detection unit, and a taper tip diameter is equal to or less than the diameter of the insertion hole. The taper length is not less than the thickness of the detecting means. Thereby, the guide part can be easily provided at the shaft end of the detection roller.

  Moreover, the guide part which guides the said guide part in the said insertion hole is formed in the front-end | tip of the said guide part. Thereby, the insertion hole of a detection means can be easily introduce | transduced into a guide part. Further, the detection means is a rotary encoder scale. Thereby, since a detection means can be set as a simple structure, it can be made cheap at a cost.

  In order to achieve the above object, the medium conveying device of the present invention is characterized by including the above respective rotation amount detecting devices and rotating the detection roller in accordance with the conveyance of the medium. In order to achieve the above object, the recording apparatus of the present invention is a recording apparatus that conveys and records a recording medium, and is characterized by including the medium conveying apparatus. In order to achieve the above object, the liquid ejecting apparatus of the present invention is a liquid ejecting apparatus that ejects a liquid onto a medium to be ejected, and is characterized by including the medium conveying apparatus. Accordingly, it is possible to provide a medium transport device, a recording device, or a liquid ejecting device that exhibits the operation of each of the rotation amount detection devices.

  FIG. 1 is a perspective view illustrating a configuration example of an ink jet printer that is one of recording apparatuses to which a medium conveying device according to an embodiment of the present invention is applied, and FIG. 2 is a main part of the ink jet printer. FIG. 3 is a cross-sectional view showing an example of the internal configuration. The ink jet printer 100 shown in FIGS. 1 to 3 is a large printer capable of recording on roll paper or cut paper having a relatively large paper width such as JIS standard A1 size or JIS standard B1 size. In the ink jet printer 100, a recording unit 120 and a medium transport device 130 according to the present embodiment are disposed in a main body 110, and a paper feeding unit 150 is disposed between leg portions 140 that support the main body 110. It has a configuration.

  As shown in FIGS. 1 to 3, the main body 110 includes a housing 111 made of plastic or sheet metal that covers the recording unit 120 and the medium conveyance device 130. As shown in FIGS. 1 to 3, the housing 111 is provided with an upper lid 112 and a front lid 113 made of translucent or transparent plastic or sheet metal so that the upper surface and the front surface can be opened.

  As shown in FIGS. 1 to 3, the upper portion of the upper lid 112 is rotatably supported, and the upper lid 112 is opened and closed when the user holds the front portion and pushes it up or down. Since the user can open the upper part of the recording unit 120 and the medium conveying device 130 by opening the upper cover 112, maintenance work for the recording head 121, the carriage 122, etc. and correction of a set position error of roll paper or cut paper It is possible to easily perform operations such as clearing paper conveyance errors such as paper jam during work, recording, and paper discharge.

  As shown in FIGS. 1 to 3, the lower part of the front lid 113 is rotatably supported, and is opened and closed when the user holds down the upper part or pushes it up or pushes it up. By opening the front lid 113, the user can greatly open the lower part of the recording unit 120 and the medium transport device 130, so that it is possible to easily perform operations such as canceling a paper transport error such as a paper jam during paper feeding. it can.

  As shown in FIGS. 1 and 2, an ink cartridge holder 160 having a holder main body 161 for storing and holding the ink cartridges 10 for each color and a cover 162 for covering the front surface of the main body 110 as viewed from the front side. Is arranged. The lower portion of the cover 162 is supported so as to be rotatable with respect to the holder main body 161, and is opened and closed when the user holds down the upper portion and pushes it down or pushes it up. Since the user can open the holder main body 161 by opening the cover 162, the user can easily replace the ink cartridge 10 or the like.

  Furthermore, as shown in FIGS. 1 and 2, an operation panel 170 for the user to perform operations such as recording control is disposed on the upper right side when viewed from the front side of the main body 110. The operation panel 170 is provided with a liquid crystal screen and various buttons so that the user can operate the buttons and correct roll sheet or cut sheet set position errors while checking the liquid crystal screen. . Since the user can perform reliable operations and operations by visual recognition, it is possible to eliminate operation errors, operation errors, and the like.

  As shown in FIGS. 2 and 3, the recording unit 120 includes a carriage 122 on which the recording head 121 is mounted, a flexible flat cable (hereinafter, referred to as a flexible flat cable that electrically connects the recording head 121 and the recording execution unit in the control unit 180. FFC) 123, and an ink tube 124 that connects the recording head 121 and the ink cartridge 10 containing ink.

  The recording head 121 includes a black ink recording head that discharges black ink and a plurality of color ink recording heads that discharge ink of each color such as dark yellow, yellow, light cyan, cyan, light magenta, and magenta. . The recording head 121 is provided with a pressure generation chamber and a nozzle opening connected to the pressure generation chamber. The size of the recording head 121 is controlled from the nozzle opening toward the roll paper by storing ink in the pressure generation chamber and pressurizing it with a predetermined pressure. Ink droplets are discharged.

  As shown in FIG. 2, the carriage 122 is mounted on a rail 127 provided in the main scanning direction via a bearing and connected to the carriage belt 128, and the carriage belt 128 is operated by a carriage driving device (not shown). Then, it is accompanied by the movement of the carriage belt 128 and is guided by the rail 127 so as to reciprocate. The FFC 123 has one end connected to the connector of the control unit 180 and the other end connected to the connector of the recording head 121, and sends a recording signal from the control unit 180 to the recording head 121.

  The ink tubes 124 are provided for the inks of the respective colors, and one end of each ink tube is connected to the corresponding ink cartridge 10 via an ink pressure supply unit (not shown), and the other end is recorded for each corresponding color. It is connected to the head 121. The ink tube 124 is configured to send ink of each color pressurized by the ink pressure supply means from the ink cartridge 10 to the recording head 121.

  As shown in FIGS. 2 and 3, the medium transport device 130 transports roll paper or cut paper in the sub-scanning direction, a paper feed roller 131 that transports the roll paper or cut paper, its driven roller 132, and roll paper or cut paper in the sub-scanning direction. The paper discharge roller 133 and its driven roller 134 for discharging the paper, the cutter 135 for cutting the recorded roll paper, the paper suction means (not shown) for preventing the roll paper and the cut paper from being lifted, and the roll paper and the cut shown in FIG. A rotation amount detection device 200 that is a characteristic part of the present invention for detecting the amount of paper transport is provided.

  The paper feed roller 131 is driven to rotate forward and backward by a driving force transmitted from a motor (not shown). The driven roller 132 is pressed against the paper feed roller 131 by a biasing member such as a spring, and rotates forward and backward following the forward / reverse rotation drive of the paper feed roller 131. The paper feed roller 131 and the driven roller 132 sandwich and feed the fed roll paper or cut paper.

  The paper discharge roller 133 is driven to rotate forward and backward by a driving force transmitted from the motor via the paper feed roller 131. The driven roller 134 is pressed against the paper discharge roller 133 by a biasing member such as a spring, and rotates forward and backward following the forward / reverse rotation drive of the paper discharge roller 133. The paper discharge roller 133 and its driven roller 134 sandwich and feed the roll paper or cut paper to be conveyed. As shown in FIG. 3, the cutter 135 is arranged to be movable in the vertical direction and the main scanning direction with the blade edge facing downward.

  The rotation amount detection device 200 is disposed between the paper feed roller 131 and the recording head 121 and is connected to the control unit 180. The rotation amount detection device 200 detects a conveyance amount of roll paper or cut paper and signals a conveyance position and a conveyance speed. Is output to the control unit 180, and the conveyance of the roll paper or the cut paper is feedback-controlled. Details of the embodiment of the rotation amount detection apparatus 200 having such a configuration will be described below with reference to FIGS. 4 and 5.

  4 and 5 are a plan view and a side view showing details of an embodiment of the rotation amount detection device 200. FIG. The rotation amount detection device 200 includes a detection roller 230 that rolls as the roll paper R and the cut paper P are conveyed, a pressing unit 240 that presses the detection roller 230 against the paper feed roller 131, and rotation of the detection roller 230. Detection means 250 for detecting the amount is provided. The detection roller 230 is provided immediately above the paper feed roller 131 and includes a roller 231 that rotates in direct contact with the roll paper R or the cut paper P, a shaft 232 that passes through the roller 231, and the like.

  The roller 231 is made of, for example, a metal such as stainless steel coated with anti-slip ceramic powder around the roller 231, and is similarly fitted on one end side of a shaft 232 made of a metal such as stainless steel. Note that the roller 231 may be formed of rubber or the like if temperature correction or the like is possible. The shaft 232 is fitted with a rotary encoder scale 251 of the detecting means 250 described later on the other end side. The shaft 232 is devised so that an excessive force is not applied to the insertion hole formed at the center when the rotary encoder scale 251 is inserted, and details will be described later.

  The pressing means 240 includes a rotating body 241 that presses the shaft 232 in the vicinity of both ends of the roller 231 from above, a support arm 243 that supports the shaft 232 of the roller 231 and the shaft 242 of the rotating body 241, and swings the support arm 243. A support portion 244 that freely supports, a tension spring 245 that biases the support arm 243, and the like are provided. Four rotating bodies 241 are arranged on both sides in the axial direction and the radial direction of the shaft 232 in the vicinity of both ends of the roller 231.

  The rotating body 241 may be anything that can assist the pressing of the roller 231 against the paper feed roller 131. For example, a bearing, a bearing, a metal or plastic roller, or the like is used. One end of the support arm 243 rotatably supports the shaft 232 of the roller 231 and fixedly supports the shaft 242 of the rotating body 241. The support portion 244 is fixed to the main body frame 101 and pivotally supports the substantial center of the support arm 243 so as to be swingable. The tension spring 245 has one end locked to the support portion 244 and the other end locked to the other end of the support arm 243.

  The detection means 250 is disposed on the main body frame 102 so as to sandwich the rotary encoder scale 251 made of a disk-shaped plastic plate attached to the other end of the shaft 232 of the roller 231 and the slit portion of the rotary encoder scale 251. The optical sensor 252 including the light emitting / receiving element, a circuit board 253 connected to the optical sensor 252 and the like are provided. As the detection means 250, instead of the rotary encoder scale 251, the optical sensor 252, the circuit board 253, etc., the magnetic encoder mounted on the shaft 232, and the main body frame 102 for detecting the magnetic change of this magnetic encoder are mounted. You may comprise with a magnetic sensor, a circuit board connected with this magnetic sensor, etc.

  FIG. 6 is a diagram showing a detailed example of the main part of the shaft 232 of the detection roller 230 and the rotary encoder scale 251 of the detection means 250. At the end of the shaft 232, a guide portion 232a having a shape in which the diameter gradually changes from the shaft end surface is formed so that an excessive force is not applied to the insertion hole 251a when the rotary encoder scale 251 is inserted. By providing such a lead-in portion 232a, when the rotary encoder scale 251 is fitted into the shaft 232, the fitting hole 251a is not inclined with respect to the shaft radial direction and gradually expands. The deviation between the shaft and the central axis of the rotary encoder scale 251 can be minimized.

The guiding portion 232a is formed in a tapered shape, for example. Here, the outer diameter of the leading end portion of the guiding portion 232a is d1, the outer diameter of the rear end portion is D1, the length is L1, the taper angle is θ1, the inner diameter of the insertion hole 251a is d2, the length is L2, and one end surface A taper angle formed when a circle with a diameter of D1 is drawn on the side and connected with a circle with a diameter of d2 on the other end surface side is defined as θ2. As a result of various experiments, as the tapered shape, for example, by satisfying conditions such as the following formulas (1) to (3), the insertion hole 251a is not inclined with respect to the axial diameter direction and gradually It turns out that it can be spread.
θ1 ≦ θ2 = tan ⁻¹ {(D1−d2) / (2 · L2)} (1)
d1 ≦ d2 (2)
L1 ≧ L2 (3)
FIG. 7 is a diagram illustrating another detailed example of the main part of the shaft 232 of the detection roller 230. At the end portion of the shaft 232, the above-described guide portion 232a is formed, and a cylindrical guide portion 232b having the same diameter as the outer diameter of the tip portion of the guide portion 232a is further formed at the tip of the guide portion 232a. ing. By providing such a guide portion 232b, when the rotary encoder scale 251 is inserted into the shaft 232, the insertion hole 251a can be easily guided to the guiding portion 232a, and the subsequent insertion can be easily performed.

  According to such a rotation amount detection device 200, the rotary encoder scale 251 rotates with the roller 231 almost without being eccentric following the conveyance of the roll paper R or the cut paper P, so the circuit board 253 causes the optical sensor 252 to move. Thus, the rotation amount of the roller 231, that is, the conveyance amount of the roll paper R or the cut paper P can be detected with high accuracy. In addition, since the rotating body 241 constantly presses the roller 231 against the paper feed roller 131, it is possible to suppress the rampage during the rolling of the roller 231 accompanying the conveyance of the roll paper R or the cut paper P. Therefore, the diameter of the roller 231 can be further minimized, and the shaft 232 of the roller 231 can be formed to be longer, so that the roller 231 straddles the ejection characteristic recovery device of the recording head 121 and the paper feed roller It is possible to dispose it directly above 131.

  For example, when the diameter of the roller 231 is r, the diameter of the rotary encoder scale 251 is R, and the slit interval is 1 / n, a high detection resolution of (1 / n) · (r / R) can be obtained on the roller 231. It is possible to improve the stopping accuracy and perform fine correction. Accordingly, since the movement of the roll paper R or the cut paper P can be detected more directly while maintaining the high detection resolution, further highly accurate conveyance can be controlled. The rotation amount detection device 200 is disposed between the paper feed roller 131 and the recording head 121 as shown in FIG. 3, but may be disposed upstream of the paper feed roller 131. In addition, the recording head 121 may be disposed downstream of the recording head 121.

  FIG. 8 is a block diagram showing a transport control unit in the control unit 180. The conveyance control unit 181 uses the rotation amount detection device 200 to feedback control the conveyance of paper such as roll paper or cut paper. That is, the adjusting unit 182 defines the paper transport position and the paper transport speed, and the paper transport target position SPP stored in the memory or the like and the current paper fed back from the rotation amount detection device 200. The sheet conveyance speed SPV is adjusted based on the difference from the conveyance position SFP.

  The adjustment unit 183 obtains the current state of the paper, the past history, and the like. The paper conveyance speed SPV from the adjustment unit 182 and the current paper conveyance speed fed back from the rotation amount detection device 200 are obtained. An operation amount SCA such as a current value for operating a control object 185 such as a motor that drives the paper feed roller 131 is adjusted via an operation unit 184 such as a driver from the difference from the SFV.

  Therefore, since the rotation amount of the motor is the rotation amount of the paper feed roller 131, and the rotation amount of the paper feed roller 131 is the conveyance amount of the paper, the rotation amount of the detection roller 230 that can directly detect this conveyance is detected. By detecting by means 250, it is possible to control highly accurate paper conveyance that is not easily affected by any error during conveyance. In this way, by directly detecting and controlling the paper conveyance amount, it is not affected by slipping, that is, the influence of paper back tension, change in front resistance, etc. is canceled, and the accuracy that eliminates the influence of paper type is dramatically improved. Improved conveyance can be performed. Further, since the detection roller 230 having a high friction coefficient is not necessary, the detection roller 230 can be manufactured at low cost.

  As shown in FIGS. 1 and 2, the leg portion 140 includes two support pillars 142 each having a moving roller 141. And the main-body part 110 is mounted on the upper part of the support pillar 142, and is fixed with a screw. Since the moving roller 141 is disposed on the support column 142, the heavy main body 110 can be smoothly moved to a desired position and installed.

  As shown in FIGS. 1 and 3, the sheet feeding unit 150 is disposed below the main body unit 110 and between the leg units 140, and includes a pair of support units 151 that support both ends of the roll paper, and a roll A feed roller 152 and a pinch roller 153 for feeding paper are provided. Further, a support portion 151 is fixed, and a pair of arm portions 154 are provided on which both ends of the feed roller 152 and the pinch roller 153 are pivotally supported. Details of the sheet feeding unit 150 having such a configuration will be described below with reference to FIG.

  FIG. 9 is a perspective view showing details of the paper feeding unit 150. The pair of support portions 151 are fixedly attached to the facing surfaces of the pair of arm portions 154 arranged to face each other. The pair of support portions 151 have a built-in bearing, and are pivotally supported at both ends of a spindle 155 that is inserted in the inner peripheral portion of the roll paper R shown in FIG. 10 and supports the roll paper R. It is like that.

  That is, the spindle 155 has a roll paper R fitted in the center, a pair of flange-shaped roll paper pressers 156 are fitted on both sides of the roll paper R, and spanned between the pair of support portions 151. . The user can complete the loading of the roll paper simply by lifting the roll paper to which the spindle 155 is attached and fitting both ends of the spindle 155 into the pair of support portions 151. Can be reduced.

  The delivery roller 152 and the pinch roller 153 are pivotally supported on the opposing surfaces of a pair of arm portions 154 that are oppositely arranged at both ends. That is, the feed roller 152 and the pinch roller 153 are arranged so as to be bridged between the pair of arm portions 154. The both ends of the feed roller 152 are axially supported at fixed locations on the opposing surfaces of the pair of arm portions 154, but the pinch roller 153 can be brought into contact with and separated from the feed roller 152. Both end shafts are axially supported so as to be movable in, for example, grooves provided on the opposing surfaces of the pair of arm portions 154. The pinch roller 153 is locked by a lock mechanism using a locking member and a biasing member provided on the facing surface of the arm portion 154 at a position where the pinch roller 153 is in contact with and separated from the feed roller 152, for example. It has come to be.

  The user can easily pull out the leading end portion of the roll paper by the bearing built in the support portion 151, and the leading end portion of the roll paper can be moved between the feed roller 152 and the pinch roller 153 by the moving mechanism of the pinch roller 153. Since it can be easily inserted and held between them, the number of man-hours for setting the roll paper can be greatly reduced.

  The pair of arm portions 154 are attached to the opposing surfaces of the two support pillars 142 of the leg portion 140 so as to be rotatable in the direction indicated by the arrows. Then, the rotation of the pair of arm portions 154 is performed by, for example, a locking member provided on the opposing surface of the support pillar 142 at the roll paper setting position shown in FIG. 11 and the roll paper feed position shown in FIG. It is positioned by being locked by a lock mechanism using an urging member or the like.

  That is, when the pair of arm portions 154 are rotated to the roll paper setting position, the feed roller 152 and the pinch roller 153 jump out to the front side of the ink jet printer 100, and the pair of arm portions 154 feed the roll paper. When rotated to the position, the feed roller 152 and the pinch roller 153 go around the back side of the ink jet printer 100 and are connected to the roll paper transport path.

  When the user inserts and pinches the leading edge of the roll paper between the feed roller 152 and the pinch roller 153, the user does not sink into the back side of the ink jet printer 100 but does not normally stand on the front side of the ink jet printer 100. Since the work can be performed at the position, the man-hours for setting the roll paper can be greatly reduced.

  In the above-described embodiment, the pair of support portions 151 are fixedly attached to the facing surfaces of the pair of arm portions 154 arranged to face each other, and rotate with the arm portions 154. Even if it is configured to be fixedly attached to a shaft concentric with the pivot shaft of the arm portion 154 attached to the opposing surfaces of the two support pillars 142, the same effect can be obtained. That is, the support part 151 may be fixed at a fixed position regardless of the rotation of the arm part 154.

  In such a configuration, the use procedure of the ink jet printer 100 will be described with reference to FIGS. First, as shown in FIG. 10A, the user pulls out one of the pair of roll paper pressers 156 fitted in the spindle 155 from one end of the spindle 155. Then, as shown in FIG. 10B, the user inserts one end of the spindle 155 from one end of the shaft hole C of the roll paper R and allows it to penetrate.

  Further, as shown in FIG. 10C, the user fits one end of the shaft hole C of the roll paper R into the other roll paper presser 156 inserted and fixed to the other end side of the spindle 155 to be brought into contact therewith. . Subsequently, the user inserts one roll paper presser 156 from one end of the spindle 155 and fits it into the other end of the shaft hole C of the roll paper R. As a result, the roll paper R can be rotated together with the spindle 155.

  Next, for example, the user pulls the feed roller 152 forward to swing the arm unit 154, and the arm unit 154 in a state of being positioned at the roll paper feeding position (see FIG. 9) is shown in FIG. ) And lock it at the setting position of the roll paper shown in Then, the user lifts the roll paper R into which the spindle 155 is inserted above the support portion 151, and inserts both ends of the spindle 155 into the recesses 151a of the support portions 151 as shown in FIG. . As described above, since the mounting of the roll paper can be completed only by fitting both ends of the spindle 155 into the pair of support portions 151, the number of man-hours for setting the roll paper can be greatly reduced.

  Next, as shown in FIG. 12A, the user lifts the pinch roller 153, separates it from the feed roller 152, and locks it. Then, the leading end of the roll paper R is pulled forward and passed between the pinch roller 153 and the feed roller 152. Subsequently, as shown in FIG. 12B, the user pushes down the pinch roller 153 to abut against the feed roller 152 and locks it, and the leading end of the roll paper R is moved between the pinch roller 153 and the feed roller 152. Hold between them. In this way, the leading edge of the roll paper can be pulled out and held between the feed roller 152 and the pinch roller 153 at the normal standing position on the front side of the ink jet printer 100, greatly increasing the number of man-hours for setting the roll paper. Can be reduced.

  Next, as shown in FIG. 13A, for example, the user pushes the feed roller 152 to the back to swing the arm unit 154, and rolls the arm unit 154 positioned at the roll paper setting position. Position at the paper feed position. As a result, the leading end of the roll paper R sandwiched between the pinch roller 153 and the feed roller 152 is positioned at the entrance of the paper feed guide 157.

  Here, when the user operates the operation panel 170 to activate the ink jet printer 100, the delivery roller 152 starts to rotate as shown in FIG. 13B. Then, the roll paper R sandwiched between the pinch roller 153 and the feed roller 152 is guided by the paper feed guide 157 and sent to the upper recording unit 120.

  Then, as shown in FIG. 14, the roll paper R is sandwiched between the paper feed roller 131 and the driven roller 132 and is transported in the sub-scanning direction while being transported in the sub-scanning direction while being ejected from the recording head 121. Predetermined information is recorded. At this time, since the conveyance of the roll paper R is controlled with high accuracy by the rotation amount detection device 200, the recording accuracy of the roll paper R can be maintained in a highly accurate state. After the completion of the recording, as shown in FIG. 15, the roll paper R is cut by a cutter 135 and sandwiched between a paper discharge roller 133 and its driven roller 134 and discharged.

  As described above, according to the ink jet printer 100 of this embodiment, the end of the shaft 232 of the detection roller 230 has the insertion hole 251 a at the shaft diameter of the shaft 232 when the rotary encoder scale 251 of the detection unit 250 is inserted. Since the lead-in portion 232a having a shape that does not incline with respect to the direction and gradually expands, that is, a shape in which the diameter of the shaft 232 gradually changes from the shaft end surface is formed, the insertion hole 251a can be easily expanded. The center axis of the shaft 232 and the center axis of the rotary encoder scale 251 can be matched, and the rotation amount of the detection roller 230 can be detected with high accuracy by the detection means 250.

  In the above-described embodiment, the guiding portion 232a is formed in a tapered shape, but is not particularly limited as long as the diameter of the shaft 232 gradually changes from the shaft end surface. For example, an exponential curve It is good also as a shape which has this curved surface. The guiding portion 232a is formed on the shaft 232 of the detection roller 230, but is not particularly limited as long as it is a shaft into which the rotary encoder scale 251 is fitted. For example, the paper feed roller 131 and its driven roller 132, The same effect can be obtained by forming the discharge roller 133 or the driven roller 134.

  Any recording apparatus provided with a medium conveying apparatus can be applied to, for example, a facsimile apparatus and a copying apparatus. In addition to a recording apparatus, the meaning of a liquid ejecting apparatus that ejects a liquid corresponding to its use from a liquid ejecting head onto an ejected medium instead of ink and attaches the liquid to the ejected medium is, for example, a liquid crystal display or the like Color material jet head used for manufacturing color filters, electrode material (conductive paste) jet head used for electrode formation for organic EL display and surface emitting display (FED), bio-organic jet head used for biochip manufacturing, precision pipette The present invention can also be applied to an apparatus equipped with a sample ejection head or the like.

1 is a perspective view illustrating a configuration example of an ink jet printer that is one of recording apparatuses according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating an internal configuration example of a main part of the printer of FIG. 1. It is sectional drawing of the principal part of the printer of FIG. It is a top view which shows embodiment of a rotation amount detection apparatus. FIG. 5 is a side view of FIG. 4. It is a figure which shows the detailed example of the principal part of the shaft of the detection roller of FIG. 4, and the rotary encoder scale of a detection means. It is a figure which shows another detailed example of the principal part of the axis | shaft of a detection roller. It is a block diagram which shows a conveyance control part. FIG. 2 is a perspective view illustrating details of a paper feeding unit of the printer of FIG. 1. FIG. 2 is a first diagram illustrating a procedure for using the printer of FIG. 1. FIG. 3 is a second diagram illustrating a procedure for using the printer of FIG. 1. FIG. 6 is a third diagram illustrating a procedure for using the printer of FIG. 1. FIG. 6 is a fourth diagram illustrating a procedure for using the printer of FIG. 1. FIG. 10 is a fifth diagram illustrating a procedure for using the printer of FIG. 1. FIG. 7 is a sixth diagram illustrating a procedure for using the printer of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ink cartridge, 100 Inkjet printer, 110 Main-body part, 111 Housing, 112 Top cover, 113 Front cover, 120 Recording part, 121 Recording head, 122 Carriage, 123 FFC, 124 Ink tube, 127 rail, 128 Carriage belt, 130 Medium Conveying device, 131 paper feed roller, 132 driven roller, 133 paper discharge roller, 134 driven roller, 140 leg, 141 roller, 142 support pillar, 150 paper feed unit, 151 support unit, 152 feed roller, 153 pinch roller, 154 Arm unit, 155 spindle, 156 roll paper press, 157 paper feed guide, 160 ink cartridge holder, 161 holder main body, 162 cover, 170 operation panel, 180 control unit, 200 rotation amount detection device, 230 detection low 231 roller, 232 shaft, 232a guide portion, 232b guide portion, 240 pressing means, 241 rotating body, 242 shaft, 243 support arm, 244 support portion, 245 tension spring, 250 detection means, 251 rotary encoder scale, 251a fitting hole 252 Optical sensor

Claims (9)

A rotation amount detection device comprising a rotatable detection roller and detection means that is fitted on the shaft end side of the detection roller and detects the rotation amount,
The rotation amount detection device is characterized in that the shaft end of the detection roller is formed in such a shape that the insertion hole does not incline with respect to the axial diameter direction and gradually expands when the detection means is inserted. . The rotation amount detection device according to claim 1, wherein the shaft end of the detection roller is provided with a guide portion having a shape whose diameter gradually changes from the shaft end surface. The rotation amount detection device according to claim 1, wherein the guide portion is formed in a tapered shape. The taper shape has a taper angle equal to or less than an angle determined by a difference between a radius of the detection roller and a radius of the insertion hole and a thickness of the detection unit, and a taper tip diameter is equal to or less than the diameter of the insertion hole. The rotation amount detection device according to claim 3, wherein a taper length is equal to or greater than a thickness of the detection means. The rotation amount detection device according to any one of claims 2 to 4, wherein a guide portion that guides the guide portion into the insertion hole is formed at a tip of the guide portion. The rotation amount detection apparatus according to claim 1, wherein the detection unit is a rotary encoder scale. A medium conveying apparatus for conveying a medium,
A medium conveyance device comprising the rotation amount detection device according to claim 1, wherein the detection roller is rotated in accordance with conveyance of the medium. A recording apparatus for conveying and recording a recording medium,
A recording apparatus comprising the medium conveying apparatus according to claim 7. A liquid ejecting apparatus that ejects liquid onto an ejection target medium,
A liquid ejecting apparatus comprising the medium conveying device according to claim 7.

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