JP4733103B2 - Printer - Google Patents

Description

  The present invention relates to a printer that conveys and prints a sheet inserted into a sheet feeding port.

  2. Description of the Related Art Conventionally, a technique for correcting a skew of a sheet inserted into a sheet feeding port has been applied to printers and has become widespread. This is because if the sheet is transported in an oblique state, the printing on the sheet is displaced.

  As an example of the skew correction technique, there is known a technique in which an oblique sheet is aligned by abutting the sheet against a pair of rollers for starting sheet conveyance. However, when the paper to be used is a slip or the like in which a plurality of papers overlap and are glued on the side, there is a problem that the paper alignment accuracy is not good. This is because the thickness of such paper differs in the width direction (thin the glued part is thin and the others are thick), and when it strikes the cylindrical paper feed roller, the thin part enters the gap between the roller pair, This is because the thick portion hits the outer peripheral surface of the paper feed roller, and as a result, the paper is inclined.

  In view of this, it is conceivable to provide a plate-like shutter for closing the guide path on the downstream side of the roller pair in order to correct skew with good alignment accuracy. That is, the skew of the paper is corrected by placing the roller pair in a separated state and abutting the paper toward the shutter. Then, after the skew correction, the shutter is displaced to open the guide path to bring the roller pair into contact, and the roller pair is rotated to convey the skew-corrected paper. According to this, since the paper strikes the plate-shaped shutter and the skew is corrected, the accuracy is good.

Japanese Utility Model Publication No. 5-86946

  However, when skew correction is performed by providing a shutter as described above, a drive source for displacing the shutter and a drive source for bringing the roller pair into and out of contact with each other are required. For example, Patent Document 1 describes a technique in which a solenoid for displacing a shutter and a solenoid for moving a roller pair apart are provided (see FIG. 1). An increase in the number of driving sources causes an increase in the size of the apparatus.

  An object of the present invention is to enable skew correction using a shutter that closes a guide path without separately providing a drive source for displacing the shutter and a drive source for moving a roller pair toward and away from each other. .

  The printer of the present invention communicates a paper supply port to which a paper is supplied and a paper discharge port from which the paper is discharged to guide the paper, and a print that is arranged in the guide path and executes a printing operation. , A shutter provided slidably between a closed position for closing the guide path and an open position for opening the guide path on the upstream side of the guide path with respect to the printing section, and the sheet feeding port. The sheet is disposed at a position in contact with one surface of the sheet and rotates in the forward direction to apply a conveying force to the sheet supplied to the sheet feeding port and pull the sheet into the guide path, and the leading end of the pulled sheet is in the closed position. A correction roller that slips between the sheet and the sheet, and is slidable between the correction roller and the shutter via the guide path. In contact A roller pair that conveys paper by rolling, a first motor that can rotate forward and backward, a second motor that drives and rotates the roller pair, and rotation of the first motor is rotation of the correction roller The first power transmission mechanism for transmitting and the rotation of the first motor in the forward direction are converted to the contact / separation operation of the roller pair and transmitted, and the roller pair of the first motor rotating in the reverse direction is transmitted. A second power transmission mechanism that interrupts power transmission to the one-way clutch, and a reverse rotation of the first motor is converted into a displacement operation of the shutter for transmission, and the positive direction of the first motor is transmitted. And a third power transmission mechanism that cuts off the power transmission to the shutter by a one-way clutch, and a sheet of paper supplied from the paper feed port to the position of the correction roller is detected by a sensor, and this paper is detected. A controller that drives the first motor to rotate in the forward direction for a first time and then rotates in the reverse direction for a second time, and then drives the second motor to rotate. The power transmission ratio between the first power transmission mechanism and the second power transmission mechanism is such that when the first motor rotates in the positive direction for the first time, the power transmission of the first power transmission mechanism. The pair of rollers separated from each other after the paper drawn into the guide path by the forward rotation of the correction roller rotating in response to the abutting against the shutter is subjected to skew correction, and then the second power transmission is performed. The ratio of contact through the paper is set according to the power transmission of the mechanism, and the power transmission ratio of the third power transmission mechanism is set when the first motor rotates in the reverse direction for the second time, Before being located at the closed position The shutter is set to a ratio at which the shutter is positioned at the open position in accordance with the power transmission of the third power transmission mechanism.

  According to the present invention, the displacement of the shutter and the contact / separation of the roller pair are performed by the motor that is the drive source of the correction roller. Therefore, the drive source for displacing the shutter and the drive source for contacting / separating the roller pair are provided. The skew correction using a shutter that blocks the guide route can be performed without providing a separate signal.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. The printer of this embodiment is an example applied to the office machine 101.

  FIG. 1 is a perspective view showing the office machine 101. The office machine 101 includes a housing 102 that accommodates each part. A display device 103 (for example, a liquid crystal display) is attached to the front surface of the housing 102. Below the display device 103, a keyboard 104 as an input device is arranged. In a region between the keyboard 104 and the display device 103 in the housing 102, a paper feed port 105 to which paper S1 (see FIG. 2) is supplied is formed. The sheet S1 supplied to the sheet feeding port 105 is a so-called cut sheet.

  FIG. 2 is a side view showing the office machine 101 with a part of the housing 102 cut away. The housing 102 is provided with a paper discharge port 106 communicating with the paper supply port 105 on the upper surface thereof. A rear paper feed port 107 for feeding the web-like continuous paper S <b> 2 is provided on the rear surface of the paper discharge port 106. A paper discharge tray 108 is rotatably mounted on the upper surface of the housing 102 so as to be positioned behind the paper discharge port 106 and for stacking and holding the sheets S1 discharged from the paper discharge port. Yes.

  Inside the housing 102, a guide path 109 that connects the paper feed port 105 and the paper discharge port 106 is provided. The guide path 109 is composed of a pair of an upper sheet guide 110 and a lower sheet guide 111 that are arranged to face each other with a predetermined gap. The guide path 109 having such a configuration connects the paper feed port 105 and the paper discharge port 106 in a curved shape.

  In a region on the discharge path 106 side of the guide path 109, a printing unit 114 that is built in the housing 102 and executes a printing operation is disposed. The printing unit 114 has a structure in which a platen 115 and a dot head 116 are arranged to face each other via a guide path 109.

  The guide path 109 is provided with a plurality of conveyance roller pairs FR arranged via the guide path 109. These conveyance roller pair FR is configured by a driving roller DR and a driven roller SR. Regarding the conveyance roller pair FR, the first conveyance roller pair FR1 (first driving roller DR1 and first driven roller SR1) and the second conveyance roller pair FR2 (second driving roller DR2 and second driving roller DR1) are arranged from a position close to the sheet feeding port 105. 2 driven rollers SR2), a third conveying roller pair FR3 (third driving roller DR3 and third driven roller SR3), and a fourth conveying roller pair FR4 (fourth driving roller DR4 and fourth driven roller SR4). The first transport roller pair FR1, the second transport roller pair FR2, and the third transport roller pair FR3 are sequentially positioned in a region from the paper feed port 105 to the printing unit 114. The first conveyance roller pair FR1 functions as a roller pair that starts conveyance of the sheet S1. The fourth transport roller pair FR4 is positioned between the printing unit 114 and the paper discharge port 106, and functions as a paper discharge roller pair.

  The driving roller DR included in each pair of conveyance rollers FR is rotated under driving control by the control unit 151 (see FIG. 8) of the office machine 101. As a result, the sheet S1 inserted from the sheet feeding port 105 is conveyed along the guide path 109.

  A tractor mechanism 112 that conveys the continuous paper S <b> 2 and feeds the continuous paper S <b> 2 to the guide path 109 is disposed on the back surface of the housing 102. The tractor mechanism 112 is curved upward from the rear sheet feed port 107, and its end is connected to a region between the second conveyance roller pair FR 2 and the third conveyance roller pair FR 3 in the guide path 109. The tractor mechanism 112 includes a pair of left and right endless pin belts (not shown) whose positions are constrained along the curved shape. These pin belts have a plurality of pins (not shown) that fit into a plurality of feed holes (not shown) provided on both sides of the continuous paper S2, and are attached to both ends of the tractor mechanism 112. A tractor drive shaft 113a and a tractor driven shaft 113b, which are rotatably provided, are wound around a tractor. Therefore, when the tractor drive shaft 113a is driven and rotated, the pin belt rolls, and the continuous sheet S2 in which the feed hole is fitted into the pin is conveyed. The continuous sheet S2 is fed into the guide path 109 by the conveyance by the tractor mechanism 112. The continuous paper S2 sent to the guide path 109 is conveyed along the guide path 109 by the rotation of the driving roller DR.

  A changer 117 is rotatably attached to a connecting portion between the tractor mechanism 112 and the guide path 109. The changer 117 closes the connection portion between the tractor mechanism 112 and the guide path 109 while being positioned at the position indicated by the solid line in FIG. Thus, the sheet S1 fed from the sheet feeding port 105 and transported along the guide path 109 by the transport roller pair FR is prevented from entering the connecting portion. In the state where the changer 117 is positioned at the position indicated by the dotted line in FIG. 2, when the continuous paper S <b> 2 is fed into the guide path 109 by the tractor mechanism 112, the guide path 109 enters the side of the paper feed port 105. Is prevented.

  Here, a part formed by each part from the paper feed port 105 to the second transport roller pair FR2 is referred to as a paper feed unit 201. Next, details of the sheet feeding unit 201 will be described.

  FIG. 3 is a side view illustrating a part of the sheet feeding unit 201. FIG. 4 is a plan view showing the paper feed unit 201. In FIG. 4, some of the parts shown in FIG. 3 (upper sheet guide 110, second transport roller pair FR2, etc.) are omitted.

  As shown in FIG. 3, a correction roller 251 is disposed in a region on the upper paper guide 110 side in the region between the paper feed port 105 and the first conveyance roller pair FR1 in the guide path 109. At a position facing the correction roller 251, a skew sensor 271 that optically detects the sheet S <b> 1 is embedded in the lower sheet guide 111. The sheet S1 that is inserted into the sheet feeding port 105 and is fed is sandwiched between the skew sensor 271 and the correction roller 251. In addition, a plurality of urethane flanges 252 are provided at regular intervals on the outer peripheral portion of the correction roller 251. A spring 252 of the correction roller 251 is in contact with the upper surface of the sheet S1 sandwiched between the skew sensor 271 and the correction roller 251.

  As shown in FIG. 4, a plurality of correction rollers 251 are held on the correction roller shaft 253 at regular intervals. Therefore, the correction roller 251 also rotates together with the rotation of the correction roller shaft 253. The correction roller shaft 253 is rotatably held by a frame FL inside the office machine 101. A clutch body 261, which will be described later in detail, is fitted and fixed to one end of the correction roller shaft 253. The clutch body 261 has a three-row configuration, and a central row portion is a gear that meshes with another gear, and both side row portions of the gear portion are belt pulleys. As for the clutch body 261, the gear in the center row portion is hereinafter referred to as a drive gear 262, the outer (lower side in FIG. 4) belt pulley is referred to as a roller belt pulley 263, and the correction roller 251 side (upper side in FIG. 4). The belt pulley is called a shutter belt pulley 264. A roller belt 281 (described later) is stretched over the roller belt pulley 263, and a shutter belt 291 (described later) is spanned over the shutter belt pulley 264.

  As shown in FIG. 4, the intermediate gear 231 disposed on the upstream side of the guide path 109 from the clutch body 261 meshes with the drive gear 262 of the clutch body 261. The intermediate gear 231 is rotatable about a shaft 241 held by the frame FL. The motor gear 221 is engaged with the intermediate gear 231. The motor gear 221 is fixed to a shaft 222 that is a rotating shaft of the first motor 211. Therefore, the drive gear 262 is rotated by driving the first motor 211. The first motor 211 of the present embodiment is a pulse motor.

  As shown in FIG. 3, on the downstream side (right side in FIG. 3) of the guide path 109 from the clutch body 261, the first conveying roller pair FR1 (first driving roller DR1, first driven roller) described based on FIG. A roller SR1) and a second conveying roller pair FR2 (second driving roller DR2, second driven roller SR2) are disposed.

  As shown in FIG. 3, the first drive roller DR1 and the second drive roller DR2 are pivotally supported by the first drive roller shaft DR1S and the second drive roller shaft DR2S, respectively, at positions on the lower surface side of the lower paper guide 111. And connected to each other by a driving roller belt DRB. Accordingly, the first drive roller pulley DR1P and the second drive roller pulley DR2P, on which the drive roller belt DRB is stretched, are provided at the ends of the first drive roller shaft DR1S and the second drive roller shaft DR2S, respectively. The second drive roller pulley DR2P is integrally provided with a second drive roller gear DR2G. The second drive roller gear DR2G meshes with the roller rotation gear 431. The roller rotation gear 431 is fixed to a shaft 432 that is a rotation shaft of the second motor 421 built in the office machine 101. Therefore, when the second motor 421 is driven and the roller rotation gear 431 rotates, the first drive roller DR1 and the second drive roller DR2 rotate integrally.

  As shown in FIG. 3, the first driven roller SR1 and the second driven roller SR2 are pivotally supported by the first driven roller shaft SR1S and the second driven roller shaft SR2S, respectively. The first driven roller shaft SR1S and the second driven roller shaft SR2S are pressed downward by a torsion spring 331. The torsion spring 331 is supported by the shaft 341 on the upper surface side of the upper paper guide 110.

  As shown in FIG. 3, the first driven roller shaft SR <b> 1 </ b> S is rotatably held by a roller holding frame 311 that is positioned below the torsion spring 331. As shown in FIG. 4, the roller holding frame 311 has an S-shape when viewed from the top. One end on the downstream side (right side in FIG. 4) of the S-shaped roller holding frame 311 is rotatable with respect to the shaft 321 fixed to the frame FL, and the other end is connected to the first driven roller shaft SR1S. Holds freely. Since the roller holding frame 311 has an S shape, interference with the roller belt 281 and the like by the roller holding frame 311 is avoided.

  As shown in FIG. 3, the roller holding frame 311 is supported from below by a roller cam 391 having an outer peripheral surface whose distance from the center is not constant. The support position of the roller holding frame 311 by the roller cam 391 is a linear portion that is supported by the shaft 321. The roller cam 391 is rotatably supported by a shaft 393 fixed to the frame FL. At the rotational position of the roller cam 391 in the state shown in FIG. 3, the roller holding frame 311 is supported by the outer peripheral surface having the longest distance from the center of the roller cam 391. In this state where the roller holding frame 311 is supported, the first driven roller SR1 is positioned at the position farthest from the first drive roller DR1. Incidentally, the roller cam 391 is formed with a shielding plate 412 protruding. The roller sensor 411, which is a transmission type sensor, is disposed at a position where the shielding plate 412 blocks light (see FIG. 4) while the roller holding frame 311 is supported in this manner.

  As shown in FIG. 3, the roller cam 391 is integrally provided with a roller cam pulley 392 around which the roller belt 281 is stretched. As described above, the roller belt 281 is stretched over the roller belt pulley 263 of the clutch body 261. Therefore, the roller cam 391 rotates integrally with the rotation of the roller belt pulley 263 of the clutch body 261.

  As shown in FIG. 3, in the region between the first transport roller pair FR1 and the second transport roller pair FR2, a shutter 351 enters the guide path 109 from below. As shown in FIG. 4, the shutter 351 enters the guide path 109 from a hole 111 a formed in the lower sheet guide 111. A plurality of shutters 351 are provided at positions facing the plurality of first driven rollers SR1, and are connected to each other at the lower end portion. A shutter frame 352 including this connecting portion is rotatably supported by a shaft 353. The shaft 353 is fixed to the frame FL.

  As shown in FIG. 3, the shutter frame 352 is pulled downward by a tension spring 361 and pushed upward by a shutter cam 381 having an outer peripheral surface whose distance from the center is not constant. The shutter cam 381 is rotatable with respect to the shutter cam shaft 383 fixed to the frame FL. At the rotational position of the shutter cam 381 in the state shown in FIG. 3, the shutter frame 352 is supported by the outer peripheral surface that is the farthest from the center of the shutter cam 381. In such a state where the shutter frame 352 is supported, the shutter 351 blocks the guide path 109. Incidentally, a shielding plate 372 is formed to protrude from the shutter cam 381. A shutter sensor 371 that is a transmission type sensor is disposed at a position where the shielding plate 372 blocks light while the shutter frame 352 is supported in this manner.

  As shown in FIG. 3, the shutter cam 381 is integrally provided with a shutter cam pulley 382 around which the shutter belt 291 is stretched. As described above, the shutter belt 291 is stretched around the shutter belt pulley 264 of the clutch body 261. Therefore, the shutter cam 381 rotates integrally with the rotation of the shutter belt pulley 264 of the clutch body 261.

  FIG. 5 is a cross-sectional view showing the clutch body 261. The clutch body 261 is mainly composed of a wheel body 262a into which a correction roller shaft 253 is inserted. The wheel body 262a has a drive gear 262 formed in the center row, and a roller belt pulley 263 and a shutter belt pulley 264 are inserted into cylindrical portions on both sides thereof.

  A connecting portion between the correction roller shaft 253 and the wheel body 262a is provided with a first one-way clutch CL1 that integrally rotates only in the counterclockwise direction and is free in the clockwise direction. Here, “counterclockwise” and “clockwise” are directions when the office machine 101 is viewed from the right side.

  A connecting portion between the roller belt pulley 263 and the wheel body 262a is also provided with a second one-way clutch CL2 that integrally rotates only in the counterclockwise direction and is free in the clockwise direction.

  A connecting portion between the shutter belt pulley 264 and the wheel body 262a is provided with a third one-way clutch CL3 that integrally rotates only in the clockwise direction and free in the counterclockwise direction.

  Therefore, when the motor gear 221 rotates counterclockwise and the drive gear 262 rotates counterclockwise, the correction roller shaft 253 integrally rotates counterclockwise and the roller belt pulley 263 also rotates counterclockwise. To do. At this time, the shutter belt pulley 264 does not rotate.

  On the other hand, when the motor gear 221 rotates clockwise and the drive gear 262 rotates clockwise, the shutter belt pulley 264 rotates clockwise integrally. At this time, the correction roller shaft 253 and the roller belt pulley 263 do not rotate.

  Here, in the present embodiment, the rotation of the motor gear 221 in the counterclockwise direction means the rotation of the first motor 211 in the positive direction, and the rotation of the motor gear 221 in the clockwise direction means the first motor 211. Means the rotation in the opposite direction. Further, the rotation of the correction roller 251 in the counterclockwise direction means the rotation of the correction roller 251 in the positive direction.

  Next, from the state shown in FIG. 3, that is, from the state where the first transport roller pair FR1 is separated from each other and the shutter 351 is located at the position where the guide path 109 is blocked (closed position), the first transport roller pair FR1 is moved from each other. A case where the shutter 351 is brought into a state where the shutter 351 is in a position (open position) where the guide path 109 is opened will be described with reference to FIGS. 6 and 7.

  FIG. 6 is a side view showing a state where the first conveying roller pair FR1 is in contact. As the motor gear 221 rotates counterclockwise from the state shown in FIG. 3 and the drive gear 262 of the clutch body 261 rotates counterclockwise, the correction roller shaft 253 as described with reference to FIG. And the roller belt pulley 263 integrally rotate counterclockwise.

  As the correction roller shaft 253 rotates counterclockwise, the correction roller 251 rotates counterclockwise. By such rotation of the correction roller 251, a conveyance force is applied to the sheet S <b> 1 in contact with the splash 252, and the sheet S <b> 1 is drawn into the guide path 109. The sheet S1 drawn into the guide path 109 hits the shutter 351 located at a position that closes the guide path 109. When the sheet S1 hits the shutter 351, the correction roller 251 that has given the conveying force to the sheet S1 slips between the sheet S1. The sheets S1 that have come into contact with the shutter 351 are aligned and subjected to skew correction.

  Also, the roller belt pulley 263 rotates counterclockwise, the roller belt 281 rotates counterclockwise, and the roller cam 391 also rotates counterclockwise. In this way, the support by the outer peripheral surface with the longest distance from the center of the roller cam 391 to the roller holding frame 311 (at this time, the first conveying roller pair FR1 is in the separated state) is released. Incidentally, the first driven roller shaft SR1S is pressed downward by a torsion spring 331 (not shown in FIG. 6). Therefore, the first driven roller SR1 is lowered by the release of the support, and the support of the roller holding frame 311 is switched to the outer peripheral surface having a short distance from the center of the roller cam 391. In this way, the first transport roller pair FR1 that are separated from each other is closed and brought into contact.

  In this embodiment, when the first motor 211 rotates counterclockwise for a predetermined time (hereinafter referred to as first time), the sheet S1 is shuttered by the counterclockwise rotation of the correction roller 251. A power transmission ratio such as a gear ratio and a pulley ratio is set so that the first conveying roller pair FR1 that has been separated from each other after being abutted against the roller 351 is in contact via the sheet S1. For example, the power transmission ratio is such that the correction roller 251 rotates twice before the separated first conveyance roller pair FR1 comes into contact.

  By the way, when the roller cam 391 rotates, the shielding plate 412 also rotates together. Therefore, the light shielding of the roller sensor 411 by the shielding plate 412 is released, and the roller sensor 411 enters a light transmitting state. As a result, the detection output input from the roller sensor 411 to the control unit 151 (see FIG. 8) changes from “low” to “high”.

  FIG. 7 is a side view showing a state in which the shutter 351 is displaced to the open position. From the state shown in FIG. 6 (the state where the first conveying roller pair FR1 is in contact with the sheet S1), the motor gear 221 further rotates clockwise, and the drive gear 262 of the clutch body 261 rotates clockwise. Thus, as described based on FIG. 5, the shutter belt pulley 264 integrally rotates clockwise. As a result, the shutter belt 291 rotates clockwise, and the shutter cam 381 also rotates clockwise. Thus, the support by the outer peripheral surface having the longest distance from the center of the shutter cam 381 with respect to the shutter frame 352 (at this time, the shutter 351 is located at the closed position) is released. Incidentally, the shutter frame 352 is pulled downward by a tension spring 361. Therefore, by releasing the support, the shutter 351 is lowered by the pulling force of the tension spring 361, and the support of the shutter frame 352 is switched to the support by the outer peripheral surface having a short distance from the center of the shutter cam 381. In this way, the shutter 351 is positioned at the open position where the guide path 109 is opened.

  In this embodiment, when the first motor 211 (not shown in FIG. 7) rotates clockwise for a predetermined time (hereinafter referred to as second time), the shutter 351 located at the closed position is opened. A power transmission ratio such as a gear ratio and a pulley ratio is set so as to be positioned at a position.

  By the way, when the shutter cam pulley 382 rotates, the shielding plate 372 also rotates together. Therefore, the light shielding of the shutter sensor 371 by the shielding plate 372 is released, and the shutter sensor 371 enters a light transmitting state. As a result, the detection output input from the shutter sensor 371 to the control unit 151 (see FIG. 8) changes from “low” to “high”.

  In the present embodiment, the wheel body 262a, the correction roller shaft 253, the first one-way clutch CL1, and the like constitute a first power transmission mechanism. Further, the second one-way clutch CL2, the roller belt pulley 263, the roller belt 281, the roller cam pulley 392, the roller cam 391, the roller holding frame 311 and the like constitute a second power transmission mechanism. The third one-way clutch CL3, the shutter belt pulley 264, the shutter belt 291, the shutter cam pulley 382, the shutter cam 381, the shutter frame 352, and the like constitute a third power transmission mechanism.

  FIG. 8 is a block diagram showing the electrical connection of the office machine 101. The office machine 101 includes a control unit 151 having a microcomputer configuration that drives and controls each unit. The control unit 151 includes a CPU, a ROM, a RAM, and the like (all not shown).

  A display device 103 and a keyboard 104 included in the office machine 101 are connected to the control unit 151.

  The controller 151 is connected to motors 152 including a first motor 211 and a second motor 421, and sensors 153 including a skew sensor 271, a shutter sensor 371, and a roller sensor 411. Yes. The motors 152 are controlled by the control unit 151 to drive. Further, the detection output of the sensors 153 is input to the control unit 151.

  In such a configuration, the control unit 151 drives and controls the first motor 211 to place the first transport roller pair FR1 in the separated state and keep the shutter 351 in the closed position. This is determined by both the detection outputs of the roller sensor 411 and the shutter sensor 371 being “low”. Then, when the paper S1 supplied to the paper supply port 105 comes into contact with the spring 252 of the correction roller 251 and is optically detected by the skew sensor 271, the detection output of the skew sensor 271 input to the control unit 151. Changes. Then, the control unit 151 of the office machine 101 drives the first motor 211 to rotate the motor gear 221 counterclockwise. At this time, the driving time of the first motor 211 is the first time described based on FIG. As a result, the sheet S1 is skew-corrected as described with reference to FIG. 6, and the skew-corrected sheet S1 is sandwiched between the first conveyance roller pair FR1 in a contact state. Next, the control unit 151 drives the first motor 211 to rotate the motor gear 221 clockwise. At this time, the driving time of the first motor 211 is the second time described with reference to FIG. As a result, the shutter 351 is lowered, the guide path 109 is opened, and the contact of the sheet S1 with the shutter 351 is released. Thereafter, the controller 151 further drives the second motor 421 to rotate the roller rotation gear 431. Thereby, the rotation of the first drive roller DR1 and the second drive roller DR2 is started. That is, the sheet S1 sandwiched between the first pair of conveyance rollers FR1 starts to be conveyed without hitting the shutter 351.

  As described above, according to this embodiment, the first motor 211 that is the driving source of the correction roller 251 causes the shutter 351 to be displaced and the first conveying roller pair FR1 to be moved away from the shutter 351. The skew correction using the shutter 351 can be performed without separately providing a drive source for displacing and a drive source for moving the first transport roller pair FR1 close to and away from each other.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. The same parts as those of the first embodiment described with reference to FIGS. 1 to 8 are denoted by the same reference numerals, and description thereof is also omitted.

  FIG. 9 is a side view illustrating the sheet feeding unit 201 according to the second embodiment. FIG. 10 is a cross-sectional view illustrating a part of the sheet feeding unit 201 according to the second embodiment. In FIG. 9, the first motor 211 is omitted.

  As shown in FIG. 10, in the second embodiment, the gear pulley body 510 in which the drive gear 262 and the roller belt pulley 263 are integrated is fixedly fitted to the correction roller shaft 253. .

  In the second embodiment, a clutch body 511 is provided as shown in FIG. The clutch body 511 is mainly composed of a wheel body 512 that is fixedly fitted to the shaft 241. This wheel body 512 has a first intermediate gear 513 that meshes with the motor gear 221 in the center row, and a second intermediate gear 514 that meshes with the drive gear 262 is inserted into one of the cylindrical portions on both sides thereof, and the shutter belt pulley on the other side. 515 is inserted. The shutter belt pulley 515 has the same function as the shutter belt pulley 264 in the first embodiment.

  As shown in FIG. 10, the connecting portion between the wheel body 512 and the shutter belt pulley 515 is provided with a fourth one-way clutch CL4 that integrally rotates only in the counterclockwise direction and is free in the clockwise direction. It has been. Also, a fifth one-way clutch CL5 is provided at the connecting portion between the wheel body 512 and the second intermediate gear 514 so that both are integrally rotated only in the clockwise direction and free in the counterclockwise direction.

  As shown in FIG. 9, in the second embodiment, a first gear pulley body 532 for shutter having a two-row configuration of gear and pulley is provided below the gear pulley body 510 so as to be rotatable around a shaft 531. Yes. The first shutter belt 291a is stretched around the shutter belt pulley 515 of the clutch body 511 and the pulley portion of the first gear pulley body 532 for shutter. In addition, the gear portion of the shutter first gear pulley body 532 meshes with the gear portion of the shutter second gear pulley body 534 having a two-row configuration of a gear and a pulley. The shutter second gear pulley body 534 is provided to be rotatable around a shaft 533. The second shutter belt 291b is stretched around the pulley portion of the shutter second gear pulley body 534 and the shutter cam pulley 382. Thus, the counterclockwise rotation of the shutter belt pulley 515 is transmitted to the shutter cam pulley 382 via the shutter first gear pulley body 532 and the shutter second gear pulley body 534, and the shutter cam 381 rotates clockwise. Rotate.

  The wheel body 512 is rotated clockwise by the counterclockwise rotation of the first motor 211, and the second intermediate gear 514 is also rotated clockwise by the fifth one-way clutch CL5 as the wheel body 512 rotates. In response to the clockwise rotational force of the second intermediate gear 514, the drive gear 262 rotates counterclockwise. Thus, the correction roller 251 starts to rotate counterclockwise, the roller cam 391 also rotates counterclockwise, and the first transport roller pair FR1 changes from the separated state to the contact state. Further, the wheel body 512 is rotated counterclockwise by the clockwise rotation drive of the first motor 211, and the shutter belt pulley 515 is also rotated counterclockwise by the fourth one-way clutch CL4 as the wheel body 512 rotates. To do. As the shutter belt pulley 515 rotates counterclockwise, the shutter cam 381 rotates clockwise and the shutter 351 is displaced from the closed position to the open position.

  Also in the second embodiment, when the first motor 211 rotates counterclockwise for the first time, the sheet S1 is abutted against the shutter 351 by the counterclockwise rotation of the correction roller 251 and skewed. After the correction, the power transmission ratio such as the gear ratio and the pulley ratio is set so that the first conveying roller pair FR1 that has been separated comes into contact with the sheet S1. Furthermore, in the second embodiment, when the first motor 211 rotates clockwise for the second time, the gear ratio and the pulley ratio are set so that the shutter 351 located at the closed position is positioned at the open position. The power transmission ratio is set.

  In the present embodiment, the wheel body 512, the fifth one-way clutch CL5, the second intermediate gear 514, the gear pulley body 510, the correction roller shaft 253, and the like constitute a first power transmission mechanism. Further, the wheel body 512, the fifth one-way clutch CL5, the second intermediate gear 514, the gear pulley body 510, the roller belt pulley 263, the roller belt 281, the roller cam pulley 392, the roller cam 391, the roller holding frame 311, etc. The power transmission mechanism is configured. Further, the wheel body 512, the fourth one-way clutch CL4, the shutter belt pulley 515, the shutter first gear pulley body 532, the shutter second gear pulley body 534, the first shutter belt 291a, the second shutter belt 291b, the shutter cam pulley 382, The shutter cam 381, the shutter frame 352, etc. constitute a third power transmission mechanism.

  In such a configuration, the control unit 151 rotates the first motor 211 counterclockwise for the first time in accordance with the output change of the skew sensor 271 due to the detection of the sheet S1, and then the second time. Only the second motor 421 is rotationally driven thereafter. As a result, the sheet S1 supplied to the sheet feeding port 105 is skew-corrected, and conveyance is started after the skew correction.

  As described above, also in the second embodiment, a method that employs the shutter 351 without separately providing a drive source for displacing the shutter 351 and a drive source for moving the first conveying roller pair FR1 apart. Skew correction can be performed.

It is a perspective view which shows an office machine. It is a side view which cuts out a part of housing and shows an office machine. FIG. 6 is a side view showing a part of a paper feed unit. It is a top view which shows a paper feed part. It is sectional drawing which shows a composite_body | complex. It is a side view which shows the state which a 1st conveyance roller pair contacts. It is a side view which shows the state which a shutter displaces to an open position. It is a block diagram which shows the electrical connection of an office machine. It is a side view which shows the paper feed part of 2nd Embodiment. It is sectional drawing which shows a part of paper feed part of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Office machine (printer), 105 ... Paper feed port, 106 ... Paper discharge port, 109 ... Guide route, 151 ... Control part, 211 ... First motor, 251 ... Correction roller, 271 ... Skew sensor (sensor), 351 ... Shutter, 381 ... Shutter cam (rotary body with shutter displacement mechanism), 391 ... Roller cam (rotary body with roller contact / separation mechanism), 421 ... Second motor, CL1 ... First one-way clutch ( A one-way clutch included in the first power transmission mechanism), CL2... Second one-way clutch (one-way clutch included in the second power transmission mechanism), CL3... A third one-way clutch (one-way clutch included in the third power transmission mechanism), CL4 ... Fourth one-way clutch (one-way clutch of the third power transmission mechanism), CL5 ... Fifth one-way Latch (one-way clutch having a first power transmission mechanism, one-way clutch having a second power transmission mechanism), FR1 ... first conveying roller pair (pair of rollers), S1 ... Paper

Claims (3)

A guide path for guiding the paper by connecting the paper supply port to which the paper is supplied and the paper discharge port from which the paper is discharged;
A printing unit that is arranged in the guide path and executes a printing operation;
A shutter provided to be displaceable between a closed position for closing the guide path and an open position for opening the guide path on the upstream side of the guide path from the printing unit;
The sheet is disposed at a position in contact with one surface of the sheet supplied to the sheet feeding port, and rotates in the forward direction to apply a conveying force to the sheet supplied to the sheet feeding port and pull the sheet into the guide path, and the sheet is pulled in. A correction roller that causes slippage between the paper when the leading edge of the paper hits the shutter located at the closed position;
A pair of rollers that are slidable through the guide path at a position between the correction roller and the shutter, and that convey paper by rotating in contact with the paper;
A first motor capable of rotating forward and reverse;
A second motor for driving and rotating the roller pair;
A first power transmission mechanism for transmitting rotation of the first motor as rotation of the correction roller;
The rotation of the first motor in the forward direction is converted to the contact / separation operation of the roller pair and transmitted, and the power transmission to the roller pair in the reverse rotation of the first motor is interrupted by a one-way clutch. A second power transmission mechanism;
The third motor is configured to convert the rotation of the first motor in the reverse direction into a displacement operation of the shutter and transmit it, and to transmit the power of the first motor in the forward direction to the shutter by a one-way clutch. A power transmission mechanism;
The paper supplied from the paper feed port to the position of the correction roller is detected by a sensor, and the first motor is driven to rotate in the positive direction for a first time according to the paper detection, and then for a second time. A controller that rotationally drives in the reverse direction and then rotationally drives the second motor;
With
The power transmission ratio between the first power transmission mechanism and the second power transmission mechanism is the power of the first power transmission mechanism when the first motor rotates in the positive direction for the first time. The pair of rollers separated from each other after the paper drawn into the guide path by the forward rotation of the correction roller rotating in response to the transmission is abutted against the shutter and corrected for skew, and then the second power It is set to the ratio of contacting through the paper according to the power transmission of the transmission mechanism,
The power transmission ratio of the third power transmission mechanism is such that when the first motor rotates in the reverse direction for the second time, the shutter that has been positioned at the closed position is the third power transmission mechanism. Is set to a ratio that is positioned in the open position according to the power transmission of
Printer. The second power transmission mechanism includes:
A roller facing / separating mechanism having a rotating body connected to the first motor via the one-way clutch of the second power transmission mechanism, and contacting and separating the roller pair according to the rotation of the rotating body. Equipped with a mechanism
The third power transmission mechanism includes:
A rotating body connected to the first motor via the one-way clutch of the third power transmission mechanism, and a shutter displacement mechanism for displacing the shutter according to the rotation of the rotating body;
The printer according to claim 1. The first power transmission mechanism includes:
A one-way clutch that cuts off power transmission to the correction roller in the reverse rotation of the first motor;
The printer according to claim 1 or 2.

Images