JP2006036374A - Medium feeding device, recording device provided with the medium feeding device and liquid injection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium feeding device capable of feeding a medium in the proper state by correcting skew of the medium, a recording device provided with the medium feeding device and a liquid injection device. <P>SOLUTION: The medium feeding device (paper feeding part 130) is a medium feeding device for feeding the medium while guiding it by a movable edge guide 35a (medium guide) for performing positioning in a width direction of the recording paper 200 (medium) and a fixed edge guide 35b (medium guide). Pressing rollers 301, 401 (pressing means) for pressing the recording paper 200 are arranged at a center or a symmetrical position to a center line of the movable edge guide 35a and the fixed edge guide 35b and press the recording paper 200, thereby, skew generated during feeding of the recording paper 200 can be corrected. Thereby, the medium feeding device corrects the skew of the medium and can feed the medium in the proper state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a medium feeding device that feeds a medium, and a recording apparatus and a liquid ejecting apparatus including the medium feeding device.

  An ink jet printer, which is one of general recording apparatuses, has a paper feed unit formed in the upper part on the back side and a paper discharge unit formed in the lower part on the front side. The paper feed unit is provided with a paper support that is stacked and supported in a state where the recording medium is inclined, a pair of paper guides that position the stacked sheets in the width direction, and the like. A stacker or the like for stacking and stacking sheets in a horizontal state is provided. Since the pair of paper guides correspond to papers having different sizes such as JIS standard A4 size and B5 size, at least one of the paper guides is movable.

  This paper guide has a function of positioning the paper in the width direction and preventing the collapse of the stacked paper, but it also causes a skew in the paper. Skew refers to feeding paper in a slanted state. For example, the side edge of the paper stacked on the paper support abuts the side of the paper guide, which is the direction opposite to the transport direction. A back tension is applied to the paper to cause a skew in the paper. If recording is performed in a state where the paper is skewed, the recording becomes tilted. Therefore, it is important to prevent the occurrence of the skew or to correct / correct the generated skew in order to obtain good recording.

  For example, Patent Document 1 discloses a transport mechanism that prevents the occurrence of skew, and Patent Document 2 discloses a paper skew feeding control device that corrects skew. In the transport mechanism of Patent Document 1, two sets of driving rollers (paper feed rollers) and driven rollers that can adjust the clamping pressure of the medium are arranged in parallel, and the sliding of the driving roller and the medium being transported is rotated by the driven rollers. By detecting the number change and adjusting each clamping pressure, slippage when the medium is clamped is suppressed and the conveyance of the medium is stabilized. Further, the sheet skew control device disclosed in Patent Document 2 is generated in the sheet conveyance path by changing the length of the path in the width direction of the sheet at the curved portion of the sheet conveyance path in an image forming apparatus such as a copying machine. The skew is corrected.

JP-A-9-67042 JP-A-6-263289

  In the transport mechanism described in Patent Document 1 above, two sets of driving rollers (paper feed rollers) and driven rollers capable of adjusting the holding pressure of the medium, a detection device that detects the number of rotations of each driven roller, and each holding pressure An adjustment mechanism for adjusting the adjustment mechanism, a control unit for controlling each adjustment mechanism by changing the rotation speed of each driven roller, and the like are disposed. For this reason, the structure of the transport mechanism is complicated, and the manufacturing cost is high due to the use of electrical components.

  Further, in the paper skew control device described in Patent Document 2, it is necessary to adjust the length of the paper in the width direction at the curved portion of the paper conveyance path, and to perform a work for adjusting the path and adjustment work. Sexuality decreases. Further, since the skew is corrected at the curved portion of the paper conveyance path, it is not suitable for the above-described skew due to the back tension of the paper guide.

  The present invention has been made in view of the various problems as described above, and an object of the present invention is to provide a medium feeding device capable of correcting the skew of the medium and feeding the medium in a correct state, and the medium. An object of the present invention is to provide a recording apparatus and a liquid ejecting apparatus provided with a feeding device.

  To achieve the above object, the medium feeding device according to the present invention is a medium feeding device that feeds the medium guided by the first and second medium guides for positioning the medium in the width direction. A skew that is disposed at a position symmetrical to the center or the center line of the first medium guide and the second medium guide and includes a pressing unit that presses the medium and corrects a skew generated during feeding of the medium. It is characterized by having correction means. As a result, the pressing means arranged at a position symmetrical to the center or the center line of the first medium guide and the second medium guide corrects the skew generated during the feeding of the medium. The medium feeding device according to the invention can feed the medium in a correct state by correcting the skew of the medium.

  In the medium feeding device of the present invention, the pressing means presses the medium with an arbitrary pressing width. Thereby, since the medium is pressed with an arbitrary pressing width, the skew generated during feeding of the medium can be reliably corrected.

  In the medium feeding device of the present invention, the skew correction means is arranged on the medium supply side. Thereby, the skew of the medium generated on the supply side of the medium can be reliably corrected.

  In the medium feeding device of the present invention, the skew correction means is interlocked with at least the first or second medium guide. Thereby, skew correction corresponding to a plurality of media having different sizes can be performed.

  In the medium feeding device according to the present invention, the skew correction means is always disposed at a position where the pressing means is symmetrical with respect to the center or the center line of the first medium guide and the second medium guide. It is characterized by that. Thereby, the skew of the medium can be easily and reliably corrected.

  In the medium feeding device according to the present invention, the skew correction means is disposed on the transport downstream side of the first and second medium guides. Thereby, recurrence of skew can be prevented.

  In order to achieve the above object, the recording apparatus of the present invention is a recording apparatus for recording on a medium, and is provided with each of the medium feeding apparatuses. 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 includes the above-described medium feeding devices. Thereby, a recording apparatus or a liquid ejecting apparatus that exhibits the above-described effects can be provided.

  Hereinafter, as an embodiment of a medium feeding apparatus according to the present invention, a medium feeding apparatus used in an ink jet printer that is one of recording apparatuses will be described with reference to FIGS. The embodiments described below do not limit the invention according to the claims, and all the combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Absent.

  FIG. 1 is a perspective view showing the entire external configuration of an ink jet type multifunction peripheral 100 which is one of recording apparatuses according to an embodiment of the present invention, FIG. 2 is a perspective view showing the internal structure, and FIG. FIG. The ink jet type multifunction peripheral 100 has a printer function capable of recording on, for example, a JIS standard L size, A6 size to A4 size cut sheet or postcard, a JIS standard size A4 size original, Equipped with a scanner function that can read originals up to US standard letter size, and a copy function that can copy to JIS standard L size, 2L size, B5 size, A4 size, six cuts, postcard size paper ing.

  As shown in FIG. 1, the inkjet multifunction peripheral 100 is entirely covered with a substantially rectangular parallelepiped housing 101, a printer 110 is disposed in the lower stage, and a scanner 120 is disposed in the upper stage. ing. A sheet feeding unit 130 (medium feeding device) including a skew correction device 300 (see FIG. 5), which is a characteristic part of the present invention, is disposed on the back side, and a sheet feeding / discharging unit 140 is disposed on the front side. It is arranged. Since the user can select one or both of the paper feeding unit 130 on the rear side and the paper feeding / discharging unit 140 on the front side as the setting direction of the paper before recording, the degree of freedom of the installation position of the inkjet multifunction peripheral 100 Can be increased. Furthermore, since the paper after recording is always discharged from the paper supply / discharge section 140 on the front side, the user can easily take out the paper.

  A rectangular flat plate-shaped scanner cover 102 shown in FIG. 1 is disposed on the upper surface of the housing 101. The scanner cover 102 has a handle 103 formed at the front, and is attached so as to be rotatable in the direction of the arrow A in the figure around a rear rotation shaft. When using the scanner 120, the user can open and close the scanner cover 102 by inserting a finger into the handle 103, so that the user can easily put in and out the document.

  On both sides of the front surface of the housing 101, cartridge housing portions 104, 104 are formed in which a plurality of ink cartridges 109 shown in FIG. Each ink cartridge 109 stores ink of each color for recording. Each cartridge storage section 104 is covered with a transparent or translucent cartridge cover 105 shown in FIG. The cartridge cover 105 is attached so as to be rotatable in the direction of the arrow B shown in the figure with a rotation shaft at the lower part thereof as a center. Even if the user does not lift the entire heavy scanner 120 and open the inside of the printer 110 as in the prior art, the ink cartridge can be released by simply pressing the cartridge cover 105 to release the locking portion and opening the cartridge storage portion 104. 109 replacement work or the like can be performed, so that work efficiency can be improved.

  As shown in FIG. 1, an operation unit 106 for instructing each operation of the printer 110, the scanner 120, and the copy is disposed in front of the scanner cover 102 on the upper surface of the housing 101. The operation unit 106 includes a power system for turning on / off the power, an operation system for operating the cueing of paper, operating an ink flushing, a processing system for performing image processing, etc. A liquid crystal panel 107 and the like for displaying are provided. The user can operate buttons and the like while looking at the liquid crystal panel 107 for confirmation.

  In the housing 101, as shown in FIGS. 2 and 3, a sheet feeding unit 130, a sheet feeding / discharging unit 140, a recording unit 150, and the like, which are an embodiment of the medium feeding device according to the present invention, are disposed. ing. As shown in FIG. 1, the paper feed unit 130 is formed with a rear paper feed port 31 that is open upward in a rectangular shape, and frames 32 are formed along both edges and the rear edge of the rear paper feed port 31. It is arranged. As shown in FIGS. 1 to 3, the frame 32 automatically has a paper support 33 that supports one or more sheets to be fed and a sheet supported by the paper support 33 one by one. A rear sheet feeding mechanism (hereinafter referred to as “rear ASF”) 34 and the like for feeding to the sheet are disposed.

  FIG. 4 is a side view showing details of the paper support 33 and the rear ASF 34. The sheet feeding unit 130 will be described with reference to FIGS. The paper support 33 is substantially constituted by a first support 33a and a second support 33b that support the back side of the paper, and a movable edge guide 35a (medium guide) and a fixed edge guide 35b (medium guide) that guide both side edges of the paper. It is connected with. Between the movable edge guide 35a and the fixed edge guide 35b, a pressing roller 301 (pressing means) and a pressing roller shaft 302 that constitute a characteristic portion of the present invention are disposed. The pressing roller 301 is a pressing member that presses the paper against the hopper 36, and the pressing roller shaft 302 is a member that supports the pressing roller 301. Each configuration of the skew correction device 300 (skew correction means) including the pressure roller 301 and the pressure roller shaft 302 is shown in FIG. 5, and a detailed description thereof will be separately described later.

  The rear ASF 34 shown in FIG. 4 has a hopper 36 that is lifted to feed the paper supported by the paper support 33, a paper feed roller 37 that picks up the paper lifted by the hopper 36, and multifeed by the paper feed roller 37. A retard roller 38 that separates the separated paper into only one sheet, a rear paper return unit 39 (see FIG. 4) for returning the remaining paper separated by the retard roller 38 to the hopper 36, and the like.

  The first support 33a is formed in a flat plate shape and is disposed inside the rear wall of the frame 32 so as to be retractable and retractable. The second support 33b is formed in a flat plate shape and can be stored and pulled out in the first support 33a. It is arranged. Since the first support 33a and the second support 33b are formed to be extendable in the paper feeding direction, they can be stored compactly when not in use, and various sizes of paper can be stored when in use. Can support reliably.

  The fixed edge guide 35b is formed in a shape along the right side wall as viewed from the apparatus front side of the frame 32, and the movable edge guide 35a is formed in a shape along the left side wall as viewed from the apparatus front side of the frame 32. It is attached so that it can move between the left side wall and the right side wall of 32 substantially parallel to the rear wall of the frame 32 (see FIG. 2). Since the movable edge guide 35a and the fixed edge guide 35b can reliably guide both side edges of the paper even if the paper sizes are different, the paper can be fed with high accuracy.

  The hopper 36 is formed in a flat plate shape on which a sheet can be placed, and is disposed substantially parallel to the rear wall of the frame 32, the lower end is positioned near the paper feed roller 37, and the upper end is the rear wall of the frame 32. It arrange | positions so that it may be located close to the top part (refer FIG. 2, FIG. 4). The hopper 36 has the other end of a compression spring (not shown) having one end attached to the rear wall of the frame 32 on the back surface on the lower end side, and the lower end side pivots about the upper end side by expansion and contraction of the compression spring. It is arranged like this.

  The paper feed roller 37 is formed in a D-shape with a part cut away, and is disposed in the vicinity of the lower end of the hopper 36. The paper feed roller 37 rotates intermittently and frictionally feeds the paper lifted by the hopper 36. (See FIG. 4). The retard roller 38 is disposed so as to come into contact with the paper feed roller 37, and when the paper is fed by the paper feed roller 37, only the uppermost paper is frictionally separated from the lower paper. Yes. The rear paper return unit 39 is formed in the shape of a claw and is disposed in the vicinity of the paper feed roller 37. The lower paper separated by the retard roller 38 is placed on the claw and returned to the hopper 36. (See FIG. 4).

  Next, the paper supply / discharge unit 140 and the recording unit 150 will be described with reference to FIGS. As shown in FIGS. 2 and 3, the paper supply / discharge unit 140 is formed with a front paper supply / discharge port 41 that opens in a rectangular shape toward the front, and a sheet is supplied below the front paper supply / discharge port 41. A tray 42 is disposed, and a paper discharge tray 43 is disposed above the paper feed tray 42. As shown in FIG. 3, a front sheet feeding mechanism (hereinafter referred to as a front ASF) that automatically feeds the sheets stored in the sheet feeding tray 42 one by one is provided at the side of the front sheet feeding / discharging port 41. ) 44 and a front discharge mechanism (hereinafter referred to as a front EJ) 45 that automatically discharges the sheet to the discharge tray 43.

  As shown in FIGS. 2 and 3, the paper feed tray 42 is formed in a flat plate shape, and the paper to be fed before recording is stacked and stored on the upper surface. As shown in FIGS. 2 and 3, the paper discharge tray 43 includes a first tray 43a, a second tray 43b, and a third tray 43c. The first tray 43a is formed in a flat plate shape, and the rear portion is rotatably disposed on the main body frame 108 of the paper feed / discharge unit 140, and the second tray 43b is formed in a flat plate shape and the first tray 43a. The third tray 43c is formed in a flat plate shape so as to be retractable and retractable on the second tray 43b.

  The sheet discharge tray 43 is configured such that the sheets to be discharged after recording are stacked on the upper surface in a state where the second tray 43b and the third tray 43c are pulled out. Since the second tray 43b and the third tray 43c are formed to be extendable and retractable in the paper discharge direction, they can be stored compactly when not in use, and various sizes of paper can be discharged when in use. The stacked sheets can be surely stacked and placed. The paper supply / discharge unit 140 is also configured to be able to manually feed and supply a tray containing thick paper, an optical disk, or the like that cannot be bent during paper supply / discharge. .

  As shown in FIG. 3, the recording unit 150 includes a paper feed roller 51 that feeds paper in the sub-scanning direction in synchronization with the recording operation, a driven roller 52, and a carriage 53 that moves in the main scanning direction in synchronization with the recording operation. A recording head 54 that ejects ink in synchronization with the recording operation, a platen 55 that holds the paper during recording flat, and the like are provided.

  As shown in FIG. 3, the paper feed roller 51 is arranged on the upstream side of the transport of the platen 55, and is fed reversely from the paper feed tray 42 via the paper fed by the paper feed roller 37 or the intermediate roller 46. The paper to be fed is nipped together with the driven roller 52 by the paper feeding mechanism 56 shown in FIG. The carriage 53 is inserted into the carriage guide shaft 57 shown in FIG. 3 above the platen 55 and connected to the carriage belt 58 (see FIG. 2). When the carriage belt 58 is operated by the carriage motor 59 shown in FIG. The carriage belt 58 is entrained by the movement of the carriage belt 58 and guided back and forth by the carriage guide shaft 57.

  As shown in FIG. 3, the recording head 54 is mounted on the carriage 53 so as to be spaced from the platen 55 by a predetermined distance. For example, a black ink recording head for discharging black ink, yellow, cyan, light cyan, And a plurality of color ink recording heads for ejecting magenta and light magenta inks, respectively. The recording head 54 is provided with a pressure generating chamber and a nozzle opening connected to the pressure generating chamber. The size of the recording head 54 is controlled from the nozzle opening toward the sheet by storing ink in the pressure generating chamber and pressurizing the ink with a predetermined pressure. Ink droplets are discharged.

  Next, a sheet feeding unit 130 that is an embodiment of the medium feeding device according to the present invention will be described in detail with reference to FIGS.

  FIG. 5 is a perspective view showing a main part of the paper feed unit 130 provided with the skew correction device 300 (skew correction means) constituting the characteristic part of the present invention. The skew correction apparatus 300 includes a pressing roller 301 (pressing unit), a pressing roller shaft 302, coil springs 303 and 303, pressing roller brackets 304 and 304, and the like shown in FIG.

  The pressing roller shaft 302 is a rod-like member extending in the main scanning direction (the width direction of the printer), and is disposed in parallel with the paper feed roller 51. The pressure roller 301 penetrated through the pressure roller shaft 302 is fitted to the pressure roller shaft 302 so as to be rotatable and movable along the pressure roller shaft 302. The pressing roller 301 is a member that presses the recording paper 200 (see FIG. 6) fed to the hopper 36 against the hopper 36 side.

  The pressing roller shaft 302 also penetrates the movable edge guide 35a and the fixed edge guide 35b, and both left and right ends of the pressing roller shaft 302 are connected to the frame 32 via pressing brackets 304 and 304. Here, the pressing brackets 304 and 304 are formed so as to apply a predetermined urging force to the pressing roller shaft 302 so that the pressing roller 301 presses the recording paper 200 against the hopper 36 side. On the right side of the pressing roller 301, a coil spring 303 wound around the pressing roller shaft 302 is disposed between the pressing roller 301 and the movable edge guide 35a. A spring 303 is disposed between the pressing roller 301 and the fixed edge guide 35b. The pressing roller 301 receives loads from the left and right coil springs 303 and 303 and moves along the pressing roller shaft 302.

  Thus, the pressure roller 301 fitted to the pressure roller shaft 302 is rotatable with respect to the pressure roller shaft 302 and moves along the pressure roller shaft 302 in response to a load from the coil springs 303 and 303. To do. However, a predetermined load is applied to the rotation of the pressing roller 301 with respect to the pressing roller shaft 302. With this load, the pressing roller 301 presses the recording paper 200 against the hopper 36 and applies a back tension to the recording paper 200. give.

  Next, the principle and characteristics of the skew correction apparatus 300 will be described with reference to FIGS.

  6 and 7 are explanatory views showing an outline of the skew correction apparatus 300. FIG. FIG. 6 shows a state in which the recording paper 200 is fed without skew (skew) on the paper feed roller 51, and FIG. 7 shows that the recording paper 200 is skewed and fed onto the paper feed roller 51. A state in which the skew is corrected later is shown. 6 and 7 are schematic diagrams for explaining the principle and characteristics of the skew correction apparatus 300, and the respective components of the above-described inkjet type multifunction peripheral 100 are omitted.

  The recording paper 200 shown in FIG. 6 is guided on the paper feed roller 51 without being inclined by the movable edge guide 35a and the fixed edge guide 35b, and then is moved downward by the paper feed roller 51 and its driven roller 52 (see FIG. 3). Have been sent to. The pressing roller shaft 302 shown in FIG. 6 receives a biasing force in the direction from the front to the back of the paper (hereinafter referred to as “paper surface direction”) by the left and right pressing brackets 304 (see FIG. 5) omitted in FIG. Due to this urging force, the pressing roller 301 presses the recording paper 200 in the paper surface direction. The pressing roller 301 has an arbitrary pressing width, and the outer peripheral surface of the pressing roller 301 contacts the recording paper 200 to press the recording paper 200 in the paper surface direction. slide.

  Further, since the pressing roller 301 receives equal loads from coil springs 303 and 303 disposed between the movable edge guide 35a and the fixed edge guide 35b, the pressing roller 301 always has the movable edge guide 35a and the fixed edge guide 35b. Located in the center of 6 is a center line L1 between the movable edge guide 35a and the fixed edge guide 35b, and the pressing roller 301 is located on the center line L1.

  The paper feed roller 51 and its driven roller 52 (see FIG. 3) sandwich the recording paper 200 with a uniform load over the entire width of the recording paper 200 and feed the recording paper 200 in the downward direction in FIG. A resultant force S1 of a uniform load applied to the entire width direction of the recording paper 200 is indicated by an arrow in FIG. Further, as described above, the pressing roller 301 applies a back tension to the recording paper 200 while pressing the recording paper 200 in the paper surface direction, so that the recording paper 200 is pulled in the counter feed direction (upward direction in FIG. 6). (Indicated by the arrow in FIG. 6 as in S1).

  In FIG. 6, since the recording paper 200 is fed by the paper feed roller 51 and its driven roller 52 without skew, the resultant force S1 and the tensile load S2 both work on the center line L1. Further, since the recording paper 200 is fed by receiving a uniform load applied to the entire width direction by the paper feeding roller 51 and the driven roller 52, the recording paper 200 is fed without tilting thereafter. In addition, since the tensile load S2 acts as a reaction force against the resultant force S1, the magnitude of the tensile load S2 is smaller than the magnitude of the resultant force S1. And the magnitude | size of the tensile load S2 can be arbitrarily adjusted by adjusting the rotational load with respect to the press roller axis | shaft 302 of the press roller 301. FIG. Further, the pressing width of the pressing roller 301 can be arbitrarily adjusted to obtain good pressing and pulling.

  Next, a case where the recording paper 200 is skewed and fed onto the paper feed roller 51 will be described with reference to FIG. As in FIG. 6, the pressing roller shaft 302 shown in FIG. 7 receives an urging force in the paper surface direction from the left and right pressing brackets 304 (see FIG. 5), and the urging force causes the pressing roller 301 to move the recording paper 200 in the paper surface direction. Press to. Similarly to FIG. 6, the pressing roller 301 receives the load of the coil springs 303 arranged on the left and right sides, and is always located at the center (on the center line L1) of the movable edge guide 35a and the fixed edge guide 35b. . Since the pressing roller 301 applies a back tension to the recording paper 200 while pressing the recording paper 200, the recording paper 200 receives a tensile load S2 as in FIG. This tensile load S2 acts on the center (on the center line L1) of the movable edge guide 35a and the fixed edge guide 35b.

  On the other hand, when the paper feed roller 51 rotates, the recording paper 200 is moved in a direction parallel to the paper feed roller 51 of the recording paper 200 (hereinafter referred to as “lateral direction”) by the paper feed roller 51 and its driven roller 52 (see FIG. 3). "It receives a uniform load on the whole. In FIG. 7, since the recording paper 200 is inclined, the lateral length of the recording paper 200 sandwiched between the paper feed roller 51 and the driven roller 52 is longer than the width of the recording paper 200. The resultant force S3 of the uniform load applied to the entire lateral direction is indicated by an arrow in FIG. This resultant force S3 is different from that shown in FIG. 6 and acts on the central position of the recording paper 200 in the lateral direction. In FIG. 7, the center line L1 of the movable edge guide 35a and the fixed edge guide 35b and the center line L2 with respect to the lateral length of the recording paper 200 are indicated by alternate long and short dash lines. That is, a uniform resultant force S3 applied to the entire lateral direction of the recording paper 200 acts on the center line L2.

  In FIG. 6, the resultant force S1 and the tensile load S2 both act on the center line L1, and the recording paper 200 is fed by receiving a load uniformly applied to the entire width direction by the paper feed roller 51 and its driven roller 52. So it is fed without tilting. On the other hand, in FIG. 7, the resultant force S3 acts on the center line L2, and the tensile load S2 acts on the center line L2, so that the recording paper 200 receives a moment to rotate clockwise (in the direction of arrow D shown in FIG. 7). . Since this moment acts in the opposite direction to the skew of the recording paper 200, the skew of the skewed recording paper 200 can be corrected.

  As described above, the pressing roller 301 that applies the back tension (tensile load S2) to the recording paper 200 while pressing the recording paper 200 is disposed on the center or the center line L1 of the movable edge guide 35a and the fixed edge guide 35b. The skew of the recording paper 200 can be corrected. Then, by adjusting the rotational load of the pressing roller 301 on the pressing roller shaft 302, the magnitude of the tensile load S2 can be arbitrarily adjusted, and the pressing width of the pressing roller 301 can be arbitrarily adjusted to be good. Therefore, it is possible to surely correct the skew of the recording paper 200.

  As shown in FIG. 5, the skew correction device 300 (the pressure roller 301, the pressure roller shaft 302, etc.) is disposed downstream of the movable edge guide 35a and the fixed edge guide 35b. As a result, the skew of the recording paper 200 caused by the back tension of the movable edge guide 35a and the fixed edge guide 35b can be corrected, and the recurrence of the skew can be prevented.

  Next, a second form of the skew correction means will be described.

  FIG. 8 is an explanatory diagram showing an outline of the skew correction apparatus 400 according to the second embodiment. Since the skew correction apparatus 400 has the same configuration as the skew correction apparatus 300 according to the first embodiment except that two pressure rollers 401 are arranged in parallel, the skew correction apparatus 400 is denoted by the same reference numeral as the skew correction apparatus 300, and the description thereof is omitted. Is omitted.

  The two pressing rollers 401 and 401 are rotatable with respect to the pressing roller shaft 302, respectively, and the pressing rollers 401 and 401 integrated by the connecting member 401a are movable along the pressing roller shaft 302. The roller shaft 302 is fitted. As in the first embodiment, the pressing roller shaft 302 shown in FIG. 8 receives an urging force in the paper direction from the left and right pressing brackets 304 (see FIG. 5), and the pressing roller 401 causes the recording paper 200 to be pressed by this urging force. Press in the direction of the paper. The integrated pressing rollers 401 and 401 receive the load of the coil springs 303 arranged on the left and right, respectively, and are always located at the center (on the center line L1) of the movable edge guide 35a and the fixed edge guide 35b. . That is, the pressing rollers 401 and 401 are disposed at positions symmetrical with respect to the center line L1. Since each pressing roller 401 applies a back tension to the recording paper 200 while pressing the recording paper 200, the recording paper 200 receives a tensile load S <b> 4 from each pressing roller 401. Since these two tensile loads S4 and S4 are symmetric with respect to the center line L1, the resultant force is the center of the movable edge guide 35a and the fixed edge guide 35b (on the center line L1) as in FIG. work.

  On the other hand, when the paper feed roller 51 rotates, the recording paper 200 is moved in a direction parallel to the paper feed roller 51 of the recording paper 200 (lateral direction) by the paper feed roller 51 and its driven roller 52 (see FIG. 3). It receives such a uniform load. The resultant force S3 of the uniform load applied to the entire horizontal direction acts on the horizontal center line L2 of the recording paper 200, as in FIG.

  Also in the second embodiment, the resultant force S3 acts on the center line L2, and the resultant force of the tensile loads S4 and S4 acts on the center line L1, so that the moment for rotating the recording paper 200 in the clockwise direction (the direction of arrow D). Receive. Since this moment acts in the opposite direction to the skew of the recording paper 200, the skew of the recording paper 200 that has been skewed can be corrected.

  Although one embodiment of the present invention has been described above, according to the present invention, the pressing rollers 301 and 401 (pressing means) that press the recording paper 200 (medium) are fixed to the movable edge guide 35a (medium guide). It is arranged at a position symmetrical to the center or the center line of the edge guide 35b (medium guide), and the skew generated during feeding of the recording paper 200 by pressing the recording paper 200 can be corrected. Thereby, the medium feeding device according to the present invention can correct the skew of the medium and feed the medium in a correct state.

  Further, according to the present invention, the pressing rollers 301 and 401 press the recording paper 200 with an arbitrary pressing width. Accordingly, the pressing width of the pressing rollers 301 and 401 can be arbitrarily adjusted to obtain good pressing and pulling, so that the skew of the recording paper 200 can be reliably corrected.

  In addition, according to the present invention, since the skew correction apparatuses 300 and 400 (skew correction means) are arranged on the supply side of the recording paper 200, the skew of the recording paper 200 generated on the supply side of the recording paper 200 is detected. Corrective correction is possible.

  In addition, according to the present invention, since the skew correction apparatuses 300 and 400 are linked with at least the movable edge guide 35a or the fixed edge guide 35b, the skew correction corresponding to a plurality of recording sheets having different sizes can be reliably performed. Can do.

  In addition, according to the present invention, in the skew correction devices 300 and 400, the pressing rollers 301 and 401 are always disposed at positions symmetrical to the center or the center line of the movable edge guide 35a and the fixed edge guide 35b. It is possible to easily and reliably correct the skew of the recording paper 200.

  Further, according to the present invention, the skew correction devices 300 and 400 are disposed downstream of the movable edge guide 35a and the fixed edge guide 35b, and therefore are generated by the back tension of the movable edge guide 35a and the fixed edge guide 35b. It is possible to correct the skew of the recording sheet 200 and to prevent the skew from recurring.

  Note that the scope of the present invention is not limited to the above-described embodiments, and can be applied to various other embodiments as long as they do not contradict the description of the claims. For example, in the embodiment of the present invention, the example in which the skew correction device 300 is provided in the paper supply unit 130 has been described. However, the same skew correction unit may be provided in the paper supply / discharge unit 140 and the medium may be supplied. The present invention can be widely applied to any medium feeding device for feeding.

  Any recording apparatus provided with a medium feeding device can be applied to, for example, a facsimile machine, a copying machine, and the like. 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 showing an overall appearance configuration of an inkjet multifunction peripheral 100 that is one of recording apparatuses according to an embodiment of the present invention. FIG. 2 is a perspective view showing an internal structure of the multifunction machine of FIG. 1. FIG. 3 is a schematic side view of the internal structure of the multifunction machine of FIG. 2. FIG. 2 is a side view showing details of a paper support 33 and a rear ASF 34 of the multifunction machine of FIG. 1. It is a perspective view which shows the principal part of the paper feed part 130 provided with the skew correction apparatus 300 which comprises the characteristic part of this invention. 1 is a first explanatory diagram showing an outline of a skew correction device 300. FIG. 5 is a second explanatory diagram showing an outline of the skew correction device 300. FIG. It is explanatory drawing which shows the outline | summary of the skew correction apparatus 400 which concerns on a 2nd form.

Explanation of symbols

31 Rear paper feed port, 32 frames, 33 paper support, 34 rear ASF, 35a movable edge guide, 35b fixed edge guide, 36 hopper, 37 paper feed roller, 51 paper feed roller, 52 driven roller, 55 platen, 100 inkjet type MFP, 110 printer, 120 scanner, 130 paper feed unit, 140 paper feed / discharge unit, 150 recording unit, 200 recording paper, 300 skew correction device, 301 pressure roller, 302 pressure roller shaft, 303 coil spring, 304 pressure roller bracket , 400 skew correction device, 401 pressure roller

Claims (8)

A medium feeding device that feeds the medium guided by first and second medium guides for positioning in the width direction of the medium,
A pressing unit arranged at a position symmetrical to a center or a center line of the first medium guide and the second medium guide and pressing the medium to correct a skew generated during feeding of the medium; A medium feeding device comprising skew correction means. The medium feeding apparatus according to claim 1, wherein the pressing unit presses the medium with an arbitrary pressing width. The medium feeding apparatus according to claim 1, wherein the skew correction unit is disposed on a supply side of the medium and on an upstream side of a medium conveyance unit that conveys the medium. The medium feeding apparatus according to claim 1, wherein the skew correction unit is interlocked with at least the first or second medium guide. 5. The skew correction means according to claim 1, wherein the pressing means is always disposed at a position symmetrical to a center or a center line of the first medium guide and the second medium guide. The medium feeding device described. The medium feeding device according to claim 1, wherein the skew correction means is disposed downstream of the first and second medium guides. A recording device for recording on a medium,
A recording apparatus comprising the medium feeding device according to claim 1. A liquid ejecting apparatus that ejects liquid onto an ejection target medium,
A liquid ejecting apparatus comprising the medium feeding device according to claim 1.

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