Printer

Abstract

In order to correct skew of a paper sheet with a simple configuration having a small number of components, a printer (100) includes a paper feed path (81), an inversion roller (77c), a nip roller (77d), and a pair of left and right guide members (51) formed by a first portion (51b) on an upstream side and a second portion (51a) on a downstream side, an interval (L2) of a portion of the first portion (51b) closest to the inversion roller (77c) is wider than a width (W1) of the paper sheet (201), and the width (W2) of the first portion (51b) is smaller than the width (W1) of the paper sheet (201). The interval (L1) of the portion closest to the second portion (51a) is approximately equal to the width (W1), so that the interval is gradually narrowed toward the feeding direction, and the second portion (51a) is approximately parallel to the interval (L1) approximately equal to the width (W1). The printer (100) includes a second cam (53b) that retracts the reversing roller (77c) in a state in which a leading end of the paper (201) reaches a downstream portion (51a), and a first cam (53a) that moves the movable guide member (52).

Description

Technical Field

[0001] The invention relates to a printer. Background Art

[0002] A printer that prints on paper cut into a predetermined length (single sheet (cut paper)) feeds the paper one by one to a conveying path by means of a driving roller. The conveying path extends from a paper storage section that stores paper, through a printing section that prints on the paper, to an outlet that discharges the paper. Then, the paper is sequentially conveyed to a plurality of driving rollers provided on the conveying path, and is thereby discharged along the conveying path (see, for example, Patent Document 1).

[0003] When the paper is fed by the drive roller, the paper may change its posture or direction, causing the paper to skew. If the paper is skewed, part of the paper will deviate from the area of ​​the conveying path where the paper is supposed to pass, causing the printing on the paper to be misaligned or the paper to get stuck inside the printer.

[0004] Therefore, some printers include a skew correction mechanism that corrects the skew of the paper by striking at least one side edge of the paper fed along the conveyance path from the outside in the width direction of the paper.

[0005] Prior art literature Patent Literature Patent Document 1: Japanese Patent No. 5987688 Summary of the invention Problem that the invention aims to solve However, the above-mentioned skew correction mechanism is composed of a plurality of parts, so there are problems that the structure is complicated and the cost is also high.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a printer capable of preventing paper jams and correcting skew of paper with a simple structure having a small number of parts.

[0007] Means used to solve problems The present invention is a printer, which comprises: a conveying path for a single sheet of paper to pass through, a driving roller for delivering the single sheet of paper along the conveying path, an upstream area of ​​the conveying path in the delivering direction of the single sheet of paper, a downstream roller, which is arranged on the downstream side of the delivering direction of the conveying path and limits the single sheet of paper passing through the conveying path, and a pair of guide members, which are arranged on the outer sides of the two side edges of the single sheet of paper passing through the conveying path and limit the positions of the two side edges of the single sheet of paper, thereby guiding the single sheet of paper; the pair of guide members respectively have a first part located on the upstream side of the delivering direction and a second part located on the downstream side, and the interval between the pair of guide members is such that the portion of the first part closest to the driving roller is wider than the width of the paper and moves toward the delivering direction of the paper. The direction gradually narrows, and the interval of the portion closest to the second portion becomes approximately equal to the width of the single paper, so that the interval is gradually narrowed toward the paper feeding direction, and the second portion on the downstream side is formed to be the width of the single paper. When the area between the driving roller and the second portion is divided into two equal parts, a first area on the upstream side and a second area on the downstream side in the feeding direction, the portion of the first portion closest to the driving roller is configured to be located in the first area, and the conveying path has a space expanding in the thickness direction of the single paper, and the space can accommodate the bent portion of the single paper that is raised in a mountain shape between the front end side portion of the single paper that has been corrected in direction by being restricted by the second portion and the rear end side portion of the single paper that is restricted by the driving roller.

[0008] Effects of the Invention The printer of the present invention can prevent paper jams and correct skew of paper with a simple structure having a small number of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a perspective view showing the appearance of a sublimation thermal printer (hereinafter referred to as a printer).

[0010] Figure 2 This is a cross-sectional view taken along a vertical plane passing through the center of the printer in the width direction W and along the front-rear direction L.

[0011] Figure 3 is to make Figure 2 The transport path shown becomes clear and Figure 2 A simplified and schematically represented diagram.

[0012] Figure 4 This is a perspective view showing a state in which the front upper cover of the printer is opened and the roll paper storage section is pulled out to the front in the front-rear direction L.

[0013] Figure 5 yes Figure 4 in the state of Figure 2 Comparative cross-sectional view.

[0014] Figure 6 This is a perspective view showing a state before the skew of the paper is corrected.

[0015] Figure 7 It is a plan view showing a state before the skew of the paper is corrected.

[0016] Figure 8 This shows the state before the skew of the paper is corrected. Figure 7 Schematic diagram of .

[0017] Fig. 9 This is a display showing that the paper is being corrected. Figure 6 Quite a stereogram.

[0018] Fig.10 This is a status indicating that the skew of the paper is being corrected. Figure 7 Quite an overhead view.

[0019] Fig.11 This shows that the paper is being corrected. Fig.10 Schematic diagram of .

[0020] Fig.12 It is a perspective view of the main parts showing a state where the paper guide is closed.

[0021] Fig.13 It is a perspective view of the main parts showing a state where the paper guide is opened.

[0022] Fig.14 This is a cross-sectional view of the main parts showing a state in which the paper guide is closed and the reversing roller is in contact with the paper.

[0023] Fig.15 This is a cross-sectional view of the main parts showing a state in which the paper guide is closed and the reversing roller is separated from the paper.

[0024] Fig.16 It is a cross-sectional view of the main parts showing a state where the paper guide is opened. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the printer of the present invention will be described using the drawings.

[0026] <Structure> Figure 1 is a perspective view showing the appearance of a sublimation thermal printer 100 (hereinafter referred to as the printer 100 ). Figure 2 is a cross-sectional view taken along a vertical plane passing through the center of the printer 100 in the width direction W and along the front-rear direction L. Figure 3 is to make Figure 2 The transport path 80 shown becomes clear and Figure 2 A simplified and schematic diagram, Figure 4 1 is a perspective view showing a state where the front upper cover 13 of the printer 100 is opened and the roll paper accommodating portion 22 is pulled out to the front in the front-rear direction L. Figure 5 yes Figure 4 in the state of Figure 2 Comparative cross-sectional view.

[0027] The printer 100 shown in the figure is one embodiment of the printer of the present invention and includes a housing 10 , a sheet storage unit 21 , a roll paper storage unit 22 , a printing unit 30 , a cutting unit 40 , a conveying unit 70 , a conveying path 80 , and a skew correction mechanism 50 .

[0028] (case) like Figure 1 As shown, the housing 10 has a housing body 11, an upper surface cover 12, a front surface upper cover 13, a front surface middle cover 14 and a front surface lower cover 15. The housing body 11 is formed to mainly cover both side surfaces in the width direction W and the rear surface in the front-rear direction L.

[0029] The upper surface cover 12 is arranged to close the opening of the upper surface of the housing body 11 in the height direction H, and forms a stacking portion 12 a for accumulating single sheets of paper 201 (hereinafter simply referred to as paper 201 ) and paper 203 unwound from a paper roll 202 .

[0030] In addition, if Figure 2 As shown, the bottom surface 12b of the stacking portion 12a is formed to be inclined so as to become lower from the rear toward the front, and the paper sheets 201 and 203 discharged toward the rear from the upper discharge port 13b of the front upper cover 13 are accumulated on the front side due to the inclination of the bottom surface 12b.

[0031] The front upper cover 13 is arranged on the upper part of the front surface of the printer 100 , the front lower cover 15 is arranged on the lower part of the front surface of the printer 100 , and the front middle cover 14 is arranged between the front upper cover 13 and the front lower cover 15 on the front surface of the printer 100 .

[0032] The front middle cover 14 has a detachable trash box 16. The trash box 16 is arranged below the cutting unit 40 described later and is a portion for storing paper pieces cut by the cutting unit 40 and cut from the paper 201, 203. The trash box 16 is installed so that it can be removed from the front middle cover 14 by sliding upward relative to the front middle cover 14. In addition, Figure 4 , 5 The waste box 16 is shown in a state where it is removed.

[0033] like Figure 4 , 5As shown, the front surface upper cover 13 and the front surface middle cover 14 are provided in the internal drawer unit 60 (an example of a drawer unit). The internal drawer unit 60 is arranged inside the housing body 11 and the upper surface cover 12, and the internal drawer unit 60 can be pulled forward relative to the housing body 11 and the upper surface cover 12 by hooking a finger on the handle portion 14a formed at the lower portion of the front surface middle cover 14 and pulling forward in the front-rear direction L.

[0034] In addition to the front surface upper cover 13 and the front surface middle cover 14, the internal drawer unit 60 also has a roll paper accommodating portion 22, the ink ribbon 32 and the platen roller 33 of the printing portion 30, the cutting portion 40, the conveying unit 70, the conveying path 80 and the skew correction mechanism 50.

[0035] The front cover 13 is supported so as to be Figure 1 The closed state shown is as shown in the inner drawer unit 60. Figure 4 , 5 As shown in the figure, it is pulled forward from the interior surrounded by the housing body 11 and the upper surface cover 12, toward Figure 4 , 5 The front upper cover 13 is rotated upward and rearward as indicated by the arrow. When the front upper cover 13 is in an open state by rotating upward and rearward, a part of the front and a part of the upper part of the roll paper storage section 22 are opened. Thus, the roll paper storage section 22 formed inside the housing 10 can be exposed, and the roll paper 202 can be put into the roll paper storage section 22 or taken out from the roll paper storage section 22.

[0036] A front discharge port 13a is formed on the front surface of the front surface cover 13 for discharging the printed papers 201 and 203 forward. In addition, an upper discharge port 13b is formed on the rear surface of the front surface cover 13 for discharging the printed papers 201 and 203 to the stacking portion formed on the upper surface cover 12 rearward.

[0037] like Figure 2 , 5 As shown, the front lower cover 15 is formed as a part of the front surface of the tray-shaped sheet storage section 21. That is, the front lower cover 15 is a part of the sheet storage section 21.

[0038] (Single-sheet paper storage unit) like Figure 2 As shown, the sheet accommodating section 21 is provided at the bottom of the printer 100 and is arranged below the roll paper accommodating section 22. The sheet accommodating section 21 accommodates sheets of paper 201 cut into a predetermined size in an overlapping manner in the thickness direction.

[0039] The single-sheet paper storage section 21 is configured so that the single-sheet paper storage section 21 can be pulled forward relative to the housing body 11 and the upper surface cover 12 independently of the internal drawer unit 60 by hooking a finger on a handle section 15a formed at the upper portion of the front lower cover 15 and pulling it forward in the front-rear direction L. Moreover, when the single-sheet paper storage section 21 is pulled forward relative to the housing body 11 and the upper surface cover 12, the upper portion thereof is open, and the single-sheet paper 201 to be stored inside can be put in and taken out from the opened upper portion.

[0040] (Roll paper storage section) As described above, the roll paper storage section 22 is formed in the inner drawer unit 60. The roll paper storage section 22 is a portion for storing the roll paper 202 in which the long paper 203 is wound into a roll shape. Figure 2 , 4 5 , the roll paper storage section 22 stores the roll paper 202 in a posture where the axis of the roll paper 202 is parallel to the width direction W of the printer 100 .

[0041] like Figure 2 As shown in FIG. 1 , when the inner drawer unit 60 is accommodated in the housing 10 , the roll paper accommodating portion 22 is arranged above the sheet paper accommodating portion 21 . Figure 2 In the figure, the paper roll 202 is arranged in a direction that rotates counterclockwise by pulling out and unwinding the paper 203 from the lower end of the paper roll 202 to the right in the figure.

[0042] (Printing Department) The printing unit 30 is arranged behind the roll paper storage unit 22. Under the control of the control unit 95 of the printer 100, the printing unit 30 prints on the paper 201, 203 passing through a portion of the conveying path 80 that stands up in a substantially vertical direction behind the roll paper storage unit 22 (a printing path 82 described later).

[0043] The printing unit 30 includes a thermal print head 31, an ink ribbon 32, and a platen roller 33. The ink ribbon 32 is fed from a delivery side roller 32a to a winding side roller 32b in synchronization with the conveyance of the paper 201, 203, and the sublimation dye applied to the ribbon is diffused and transferred to the paper 201, 203 by the heat generated by the thermal print head 31 in contact with the ribbon, thereby printing on the paper 201, 203.

[0044] The ink ribbon 32 is arranged in the internal drawer unit 60, such as Figure 4 , 5 As shown, the inner drawer unit 60 can be pulled out forward from the housing body 11 and passed through the top of the roll paper accommodating portion 22 in an arc shape and pulled out forward, so that the ink ribbon 32 can be easily replaced.

[0045] The platen roller 33 is disposed on the opposite side of the ink ribbon 32 and the thermal print head 31 with the papers 201 and 203 interposed therebetween. The platen roller 33 presses the papers 201 and 203 against the thermal print head 31 with the ribbon interposed therebetween.

[0046] (Cutting part) The cutting unit 40 is arranged in front of the roll paper storage unit 22 and inside the front upper cover 13. Under the control of the control unit 95 of the printer 100, the cutting unit 40 cuts the paper 201, 203 passing through the portion of the conveying path 80 extending from the top of the roll paper storage unit 22 to the front (discharge path 83 described later) along the width direction W. The cut pieces of the cut paper 201 fall and are accumulated inside the waste box 16 arranged below the cutting unit 40.

[0047] (Transportation path) The conveyance path 80 is a path for conveying the paper sheets 201 and 203. In the conveyance path 80, the portion for conveying the single paper sheet 201 will be described first.

[0048] like Figure 2 , 3 As shown by the single-dot chain line in , the portion of the conveying path 80 that conveys the single paper 201 includes a paper supply path 81, a printing path 82, a discharge path 83, a front discharge path 84, an upper discharge path 85, a print upstream path 86, and a print downstream path 87.

[0049] The paper feed path 81 extends upward from the front end of the single paper accommodating section 21, folds back and extends toward the rear and downward in the space formed in front of the roll paper accommodating section 22 and behind the front surface middle cover 14, extends toward the rear of the roll paper accommodating section 22 below the roll paper accommodating section 22 and above the single paper accommodating section 21, and then forms a position standing upward behind the roll paper accommodating section 22.

[0050] In addition, the paper supply path 81 has a space S, which expands in the thickness direction of the paper 201 as described later, so that even if a single sheet of paper 201 is conveyed in a state where it is raised in a mountain shape in the thickness direction, the curved portion K of the paper 201 raised in a mountain shape will not be hooked and allowed to pass through.

[0051] The print path 82 follows the paper feed path 81, extends upwardly along the rear of the roll paper accommodating section 22, and then extends forward above the roll paper accommodating section 22 to the front portion above the roll paper accommodating section 22. The aforementioned printing section 30 is disposed on the print path 82.

[0052] The discharge path 83 continues from the print path 82 and extends forward from the upper front portion of the roll paper storage unit 22 along the front-rear direction L. The cutter 40 is disposed on the discharge path 83 . The discharge path 83 extends to a position forward of the cutter 40 .

[0053] The front discharge path 84 continues from the discharge path 83 and extends forward to the front discharge outlet 13a. The upper discharge path 85 continues from the discharge path 83 and extends to the upper discharge outlet 13b while curving upward and rearward.

[0054] A discharge path switching member 71 is provided at a branching portion between the front discharge path 84 and the upper discharge path 85 to switch the paper 201 , 203 advancing forward in the discharge path 83 to the upper discharge path 85 or the front discharge path 84 .

[0055] The print upstream path 86 follows the print path 82, and extends from the front portion above the roll paper storage section 22 toward the bottom of the roll paper storage section 22 in a concentric circle shape concentric with the outer circumference of the roll paper storage section 22 to a position just before it hits the paper supply path 81. The print upstream path 86 is a path through which the paper 201 is fed to the print path 82 and pulled in before being printed by the printing section 30, and the print downstream path 87 described later is a path through which the paper 201 that has been fed to the print path 82 and printed by the printing section 30 is fed.

[0056] That is, the unprinted portion of the paper 201 passes through the print upstream path 86 , and the printed portion of the paper 201 passes through the print downstream path 87 .

[0057] A print discharge switching plate 72 is provided at the branching portion between the print upstream path 86 and the discharge path 83. The print discharge switching plate 72 is provided to be rotatable in a manner that the front end is displaced up and down, and is rotated under the control of the control unit 95. Figure 2 In the state shown, the front end is arranged at the lower side, and at this time, the paper 201 advancing forward in the print path 82 is switched to advance toward the discharge path 83. On the other hand, when the front end of the print discharge switching plate 72 is arranged at the upper side, the paper 201 advancing forward in the print path 82 is switched to advance toward the print upstream path 86.

[0058] The print downstream path 87 is formed to be the end portion on the paper feed path 81 side following the print path 82, below the roll paper accommodating portion 22 and below the paper feed path 81 and above the single sheet paper accommodating portion 21, extending from the rear of the roll paper accommodating portion 22 toward the front, and the front end of the front side of the print downstream path 87 stands upward and smoothly merges with the paper feed path 81 which also stands upward.

[0059] In addition, the surface of the paper 201 that contacts the ink ribbon 32 in the printing path 82, that is, Figure 2 , 3 The printing is performed on the surface facing the rear in the front-rear direction L. When the paper 201 is conveyed to the print downstream path 87 , the surface to be printed in the print path 82 faces downward in the height direction H.

[0060] When the paper 201 is conveyed forward in the downstream printing path 87 and merges with the upwardly rising paper feed path 81 and is conveyed in the paper feed path 81 , the printed surface faces upward in the height direction H below the roll paper accommodating portion 22 .

[0061] Furthermore, when the paper 201 is conveyed backward in the paper supply path 81 and then conveyed in the upwardly erected printing path 82, the printed surface faces forward in the front-back direction. That is, the paper 201 is conveyed in the paper supply path 81 by merging with the paper supply path 81 from the printing downstream path 87, and thus becomes in a state where the front and back sides are reversed. Therefore, the path from the printing downstream path 87 to the paper supply path 81 forms a reversing path including the paper supply path 81, which reverses the front and back sides of the paper 201 whose front side has been printed.

[0062] Next, the portion of the conveying path 80 that conveys the paper 203 unrolled from the paper roll 202 is described. The portion of the conveying path 80 that conveys the paper 203 unrolled from the paper roll 202 includes, in addition to the portion that conveys the single paper 201 described above, Figure 2 , 3 As shown by the single-dot chain line in FIG. 8 , there is also a roll paper supply path 89.

[0063] The roll paper feeding path 89 extends rearward from substantially the lowermost portion of the roll paper 202 accommodated in the roll paper accommodating portion 22 , and is formed to a position standing upward at the rear of the roll paper accommodating portion 22 .

[0064] A paper feed switching plate 73 is provided at a portion where the paper feed path 81 and the roll paper feed path 89 merge. The paper feed switching plate 73 is provided so as to be rotatable with its front end displaced forward and backward. Figure 2 In the state shown, the paper feed switching plate 73 is in a state where the front end is urged forward by omitting the spring shown in the figure, and the paper 201 being transported in the paper feed path 81 moves toward the printing path 82. In addition, the paper 201 being transported from the printing path 82 moves toward the printing downstream path 87.

[0065] On the other hand, when paper 203 unwound from roll paper 202 and conveyed in roll paper feed path 89 advances toward print path 82 , paper 203 overcomes the biasing force of the spring and presses the front end of paper feed switching plate 73 rearward to advance toward print path 82 .

[0066] When the paper 203 unrolled from the roll paper 202 is printed by the printing section 30 of the printing path 82, the paper 203 is still not separated from the roll paper 202, so the paper feed switching plate 73 is still pressed by the portion of the paper 203 passing through the roll paper feed path 89 to the rear side of the range in which the front end can be displaced.

[0067] (Transportation unit) The conveying unit 70 includes a sheet feeding roller 77a, a paper supply roller 77b, a reverse roller 77c, a pinch roller 77d, a feed roller 77e, a first discharge roller 77f, a second discharge roller 77g, and a roll paper feeding roller 77h. These conveying rollers 77a to 77h are driven by, for example, a single motor, but may be driven by two or more motors alone.

[0068] Each of the conveying rollers 77 a to 77 h contacts either the front or back side of at least one of the single paper 201 and the paper 203 , and is rotated by a motor driven under the control of the control unit 95 , thereby conveying the paper 201 , 203 along the conveying path 80 .

[0069] The sheet paper delivery roller 77a is arranged above the front end portion of the sheet paper storage section 21. The sheet paper delivery roller 77a contacts the sheet paper 201 stacked on the top of the sheet paper 201 stored in the sheet paper storage section 21, and delivers the sheet paper 201 to the paper supply path 81 by rotating. In addition, the sheet paper delivery roller 77a can rotate in the direction opposite to the delivery direction, and pull the sheet paper 201 delivered to the paper supply path 81 back to the sheet paper storage section 21.

[0070] The paper feed roller 77b is arranged close to the sheet paper delivery roller 77a of the paper feed path 81. The paper feed roller 77b contacts the sheet paper 201 delivered to the paper feed path 81 by the sheet paper delivery roller 77a, and conveys the sheet paper 201 upward along the paper feed path 81. In addition, the paper feed roller 77b can also rotate in the direction opposite to the above conveying direction to pull back the sheet paper 201.

[0071] The reversing roller 77c, pinch roller 77d, feed roller 77e, first discharge roller 77f, second discharge roller 77g, and roll paper delivery roller 77h described below can also rotate in the direction opposite to the conveying direction similarly to the paper feed roller 77b to pull back the single paper 201.

[0072] The reversing roller 77c is disposed above the paper feed roller 77b in the paper feed path 81. The reversing roller 77c contacts the paper sheet 201 advancing in the paper feed path 81 by the paper feed roller 77b, and conveys the paper sheet 201 along the paper feed path 81 toward the printing path 82.

[0073] The pinch roller 77d is a portion of the print path 82 close to the paper feed path 81, and is disposed at a position forward of the front end of the paper feed switching plate 73. The pinch roller 77d contacts the single sheet of paper 201 conveyed to the print path 82, and allows the single sheet of paper 201 to pass through the printing unit 30 and be conveyed toward the discharge path 83 or the print upstream path 86. At this time, the paper feed switching plate 73 is switched to the front side, allowing the single sheet of paper 201 conveyed in the paper feed path 81 to be conveyed to the print path 82.

[0074] The feed roller 77e is disposed on the discharge path 83 closer to the printing path 82 than the cutter 40. The feed roller 77e contacts the paper 201 conveyed to the discharge path 83, and conveys the paper 201 through the cutter 40 to the first discharge roller 77f.

[0075] The first discharge roller 77f is arranged near the end of the discharge path 83 on the side away from the printing path 82 and in front of the discharge path switching member 71. The first discharge roller 77f contacts the single paper 201 conveyed to the discharge path 83, and conveys the single paper 201 to the front discharge path 84 or the upper discharge path 85 according to the position of the discharge path switching member 71.

[0076] The second discharge roller 77g is disposed near the upper discharge port 13b in the upper discharge path 85. The second discharge roller 77g contacts the paper 201 conveyed to the upper discharge path 85 and discharges the paper 201 to the stacking portion 12a of the upper cover 12 from the upper discharge port 13b.

[0077] The roll paper delivery roller 77h is arranged at a portion of the roll paper feeding path 89 on the side close to the printing path 82 and in front of the front end of the paper feeding switching plate 73. The roll paper delivery roller 77h contacts the paper 203 wound on the outermost periphery of the roll paper 202 accommodated in the roll paper accommodating section 22, and delivers the paper 203 toward the pinch roller 77d by rotating.

[0078] The roll paper feed roller 77 h can rotate in the direction opposite to the feed direction, and can wind the paper 203 fed toward the pinch roller 77 d back to the roll paper 202 in the roll paper accommodating portion 22 .

[0079] (sensor) like Figure 2 , 5 As shown, in the printer 100, a first sensor 96 is provided on the path of the printing path 82 and at a position closer to the printing upstream path 86 than the clamping roller 77d. The first sensor 96 detects the passage of the front end 201a of the paper 201 in the delivery direction when the paper 201 is sent to the printing upstream path 86 by the clamping roller 77d.

[0080] In addition, in the printer 100, a second sensor 97 is provided on the path of the printing path 82 and at a position closer to the printing downstream path 87 than the clamping roller 77d. The second sensor 97 detects the passage of the rear end of the paper 201 in the delivery direction when it is sent to the printing upstream path 86 by the clamping roller 77d.

[0081] (skew correction mechanism) Next, refer to Figures 6 to 11 The skew correction mechanism 50 will be described as follows. Figure 6 , 7 8 shows the state before the skew of the paper 201 is corrected. Figure 6 It is a stereogram. Figure 7 It is a top view. Figure 8 yes Figure 7 In addition, Fig. 9 , 10 11 shows the state where the skew of the paper 201 is being corrected. Fig. 9 is with Figure 6 Quite a stereogram, Fig.10 is with Figure 7 Quite a top view. Fig.11 is with Figure 8 Quite a schematic diagram.

[0082] The skew correction mechanism 50 corrects the skew of the single paper 201 that is conveyed in the conveying path 80 and moves obliquely or changes its direction relative to the conveying direction. Figure 6 As shown, the skew correction mechanism 50 has a paper feed path 81 (an example of a conveying path), a reversing roller 77 c (an example of a driving roller), a clamping roller 77 d (an example of a downstream roller), a pair of left and right guide members 51 , a pair of left and right movable guide members 52 , and a pair of left and right cam members 53 .

[0083] The reversing roller 77c is disposed in the upstream region of the paper feeding path 81 in the feeding direction of the single paper 201. The reversing roller 77c is configured to restrict the single paper 201 by contacting the single paper 201, and can move between a clamping position for feeding the single paper 201 and a retreat position for separating from the paper 201 and releasing the restriction on the single paper 201.

[0084] The pinch roller 77d is provided on the printing path 82. The printing path 82 is provided on the downstream side of the feeding direction of the single sheet of paper 201 in the paper feeding path 81, and therefore, the pinch roller 77d is provided on the downstream side of the feeding direction of the single sheet of paper 201 in the paper feeding path 81. The pinch roller 77d is configured similarly to the reversing roller 77c to be movable between a pinching position where it contacts the single sheet of paper 201 passing through the paper feeding path 81 and restricts the single sheet of paper 201, and a retreat position where it is separated from the single sheet of paper 201 and releases the restriction on the single sheet of paper 201.

[0085] Furthermore, the interval between the reversing roller 77c and the pinch roller 77d along the paper feed path 81 is shorter than the length of the paper sheet 201. Therefore, when the leading end 201a of the paper sheet 201 fed in the feeding direction along the paper feed path 81 by the reversing roller 77c reaches the pinch roller 77d, the trailing end of the paper sheet 201 is located at a position capable of contacting the reversing roller 77c.

[0086] like Figure 7 As shown, a pair of left and right guide members 51 distributed and arranged in the width direction W are fixedly arranged at both side edges of the paper feeding path 81. Each guide member 51 is formed with a wall surface, which is located outside the both side edges of the single paper 201 passing through the paper feeding path 81 and stands vertically from the surface of the paper feeding path 81 in the thickness direction of the single paper 201. Thus, the guide members 51 restrict the positions of the both side edges of the single paper 201 and guide the paper 201 by the side edges of the single paper 201 passing through the paper feeding path 81 contacting the standing wall surface.

[0087] The guide members 51 are respectively formed with Figure 7 The arrow in the figure shows a first portion 51 b on the upstream side of the feeding direction of the paper 201 and a second portion 51 a on the downstream side.

[0088] like Figure 8 As shown in the schematic diagram of the left and right pairs of first portions 51b, the upstream portion 51c closest to the reversing roller 77c is formed with a gap L2 wider than the width W1 of the paper 201 (as an example, L2 is 207 [mm]), and the downstream portion 51d closest to the second portion 51a is formed so that the gap gradually narrows toward the feeding direction of the single paper 201 (indicated by the arrow) in a manner that the gap L1 is substantially equal to the width W1 of the single paper 201, extending from the first area a1 to the second area a2. In addition, in this example, the first portion 51b is formed integrally with the second portion 51a. The pair of first portions 51b in this embodiment are formed so that the gap gradually narrows linearly, but are not limited to the structure formed so that the gap gradually narrows linearly.

[0089] On the other hand, the second portion 51 a is formed parallel to the feeding direction at an interval L1 substantially equal to the width W1 of the paper sheet 201 (as an example, L1 is 203 [mm]), and is connected to the downstream portion of the first portion 51 b where the interval is the narrowest.

[0090] In addition, it is configured that when the area between the reversing roller 77c (the rotation center of the reversing roller 77c) and the second part 51a (the central part along the sending direction) is divided into two equal parts: a first area a1 on the upstream side in the sending direction and a second area a2 on the downstream side, that is, when it is divided into two equal parts: a first area a1 close to the reversing roller 77c and a second area a2 close to the second part 51a, the upstream side part 51c of the first part 51b closest to the reversing roller 77c is located in the first area a1, and the downstream side part 51d close to the second part 51a is located in the second area a2.

[0091] Thus, the portion of the first portion 51b that is closest to the reversing roller 77c and has a gap L2 wider than the width W1 of the sheet 201 is located in the first area a1, so that the sheet 201 fed by the reversing roller 77c is fed into the first portion 51b almost reliably. Then, the sheet 201 is guided and conveyed by the first portion 51b to the second portion 51a having a gap L1 that is substantially equal to the width W1 of the sheet 201.

[0092] exist Figure 8 In the illustrated example, a downstream side portion 51 d of the first portion 51 b that is closest to the second portion 51 a extends to the second region a2 .

[0093] like Figure 7 As shown, a pair of left and right movable guide members 52 are provided on both side edges of the paper feeding path 81, distributed in the width direction W, on the upstream side of the guide member 51 in the feeding direction of the single paper 201 and on the downstream side of the reversing roller 77c. Figure 7 As shown, the movable guide members 52 are also provided on both sides of the paper supply path 81 .

[0094] Furthermore, in the printer 100, the positions of the left and right pair of movable guide members 52 and the reversing roller 77c in the conveying direction may be interchanged, and the reversing roller 77 may be arranged on the downstream side of the movable guide member 52, and the movable guide member 52 may be arranged on the upstream side of the reversing roller 77. Even if these positions are interchanged, the same structure and operation as in the case where they are not interchanged can be applied.

[0095] A pair of movable guide members 52 are formed in parallel along the feeding direction. In addition, the pair of movable guide members 52 are provided so as to be able to slide in the axial direction on a common single shaft 52a. The shaft 52a is fixed to the center of a pair of left and right cam members 53 described later. Both ends of the shaft 52a are supported by left and right frame side plates 56 so as to be freely rotatable.

[0096] The movable guide members 52 are formed with wall surfaces which are located outside the side edges of the paper 201 passing through the paper feed path 81 and stand vertically from the surface of the paper feed path 81 in the thickness direction of the paper 201. Each movable guide member 52 is provided so as to be movable in the width direction W along the axis 52a between a position away from the side edges of the paper 201 passing through the paper feed path 81 and a position in contact with the side edges of the paper 201.

[0097] Specifically, a pair of movable guiding members 52 is configured to be able to move between a gap L2 wider than the width W1 of a single sheet of paper 201 and a gap L1 approximately equal to the width W1 of the single sheet of paper 201. When the gap is the gap L1 approximately equal to the width W1 of the single sheet of paper 201, the pair of movable guiding members 52 is in a position to contact the two side edges of the single sheet of paper 201.

[0098] Furthermore, the positions at which the pair of movable guide members 52 contact the both side edges of the sheet 201 are set such that each movable guide member 52 is arranged at a position on an extension line of the downstream side portion 51a of the guide member 51 along the front-rear direction L. Furthermore, the positions at which the pair of movable guide members 52 are spaced apart by a space L2 wider than the width W1 of the sheet 201 are set such that the movable guide members 52 are arranged at a position on an extension line of the upstream side end of the upstream side portion 51b of the guide member 51 along the front-rear direction L.

[0099] The printer 100 may also be provided with an adjustment mechanism that limits the position of the pair of movable guide members 52 to move to the side contacting the two side edges of the sheet 201 within the movable range of the pair of movable guide members 52 and adjusts the position of the movement. The adjustment mechanism may include, for example, a pair of abutting portions abutting against each inner surface of the pair of movable guide members 52, and a fixing portion fixed to any one position or any one of a plurality of positions in the width direction W (direction orthogonal to the conveying direction) of the sheet 201, and may be composed of a plate-shaped restriction member (adjustment plate, etc.) disposed between the pair of movable guide members 52 and a fixing unit (fixing screw, etc.) fixing the restriction member. The fixing unit may be, for example, a long hole extending in the width direction W of the sheet 201, and a fixing screw as the fixing unit is inserted into the long hole.

[0100] Thus, when a pair of movable guiding members 52 moves toward and contacts the two side edges of a single paper 201, the position where the pair of movable guiding members 52 moves to and stops on the two side edges of the single paper 201 can be adjusted so that the single paper 201 is corrected to a normal posture at a position where the end portion on the downstream side of the feeding direction in the second part 51a of the guiding member 51 is not offset.

[0101] The restriction member may not be a single member, but may be provided separately as a restriction member for one of the pair of movable guide members 52 and a restriction member for the other of the pair of movable guide members 52 .

[0102] Moreover, the position where the interval between a pair of movable guide members 52 is the interval L2 which is wider than the width W1 of a single paper 201 may be a position wider than the position on the extension line along the front-to-back direction L of the upstream end portion 51b of the guide member 51 where the movable guide member 52 is arranged.

[0103] On the outer side of the movable guide member 52 in the width direction W, a pair of cam members 53 are respectively fixed on the shaft 52a. The cam member 53 can rotate around the shaft 52a integrally. In each cam member 53, the first cam 53a and the second cam 53b are formed integrally. The first cam 53a is formed on the outer peripheral surface of the cam member 53. The cam surface of the first cam 53a contacts the driven member 55 integrally provided with the movable guide member 52. As the cam member 53 rotates, the first cam 53a causes the driven member 55, which is urged toward the inner side of the width direction W by the spring 57, to be displaced toward the outer side of the width direction W, thereby moving the movable guide member 52 in the width direction W.

[0104] Therefore, the first cam 53 a is an example of a moving member that moves the movable guide member 52 in the width direction W between a position at a distance L2 wider than the width W1 of the paper 201 and a position at a distance L1 substantially equal to the width W1 of the paper 201 .

[0105] The second cam 53b is formed on the inner peripheral surface of the cam member 53. The second cam 53b contacts the connecting plate 54 supporting the shaft 77c1 of the reversing roller 77c. The connecting plate 54 is supported so as to be rotatable around the shaft 77c2 supported by the left and right frame side plates 56. As the cam member 53 rotates around the shaft 52a, the second cam 53b displaces the connecting plate 54 outward in the radial direction of the cam member 53. As a result, the connecting plate 54 rotates around the shaft 77c2, so that the reversing roller 77c supported by the shaft 77c1 moves from the position in contact with the single paper 201 to the retracted position.

[0106] Therefore, the second cam 53b is an example of a retracting member that retracts the reversing roller 77c at the clamping position in contact with the paper 201 to a retracting position away from the single paper 201 when the front end 201a of the paper 201 in the feeding direction has reached the downstream portion 51a of the guide member 51.

[0107] In this way, the cam member 53 is linked with the movable guide member 52 and the reversing roller 77c. Specifically, when the cam member 53 is located at the first rotation position, the reversing roller 77c is located at a position in contact with the single paper 201, and the movable guide member 52 is located at a position away from both side edges of the paper 201 at a gap L2. On the other hand, when the cam member rotates and is located at the second rotation position, the reversing roller 77c is located at a retreat position not in contact with the single paper 201, and the movable guide member 52 is located at a position in contact with both side edges of the single paper 201 at a gap L1.

[0108] When the cam member 53 starts rotating from the first rotational position toward the second rotational position, the reversing roller 77 c immediately moves away from the paper sheet 201 . Therefore, the reversing roller 77 c reaches the retracted position before the cam member 53 reaches the second rotational position.

[0109] On the other hand, even if the cam member 53 starts to rotate from the first rotation position toward the second rotation position and the reversing roller 77c reaches the retracted position, the movable guide member 52 is only slightly narrower than the interval L2. When the cam member 53 has reached the second rotation position, it becomes the interval L1 for the first time and is in contact with the two side edges of the single paper 201.

[0110] That is, when the cam member 53 rotates from the first rotation position toward the second rotation position, the reversing roller 77 c first leaves the paper 201 and releases the restriction on the rear end 201 b side of the paper sheet, and then continues to rotate, thereby causing the movable guide member 52 to contact the two side edges of the paper sheet 201 .

[0111] The cam member 53 is rotated between a first rotational position and a second rotational position under the control of the control unit 95 of the printer 100 .

[0112] (Reverse roller retraction control during printing) As described below, the control unit 95 controls the movement (retraction) of the reversing roller 77 c to the retracted position.

[0113] As will be described later, during the printing process of the single sheet of paper 201 by the printing unit 30 of the printer 100, the single sheet of paper 201 is temporarily sent through the printing path 82 to the printing upstream path 86 under the control of the control unit 95. At this time, although the single sheet of paper 201 passes through the printing path 82, the control unit 95 does not print on the single sheet of paper 201. Thereafter, the control unit 95 reverses the feeding direction of the single sheet of paper 201, rotates the pinch roller 77d, and allows the single sheet of paper 201 to pass through the printing path 82, while controlling the printing unit 30 to print on the single sheet of paper 201.

[0114] In this printing process, the portion of the paper sheet 201 printed on the printing path 82 , that is, the portion on the leading end side in the feeding direction of the paper sheet 201 , is fed from the printing path 82 to the printing downstream path 87 .

[0115] The length along the downstream printing path 87 between the pinch roller 77d for feeding the single paper 201 on the printing path 82 and the reversing roller 77c provided on the paper feeding path 81 merging with the downstream printing path 87 is set shorter than the length in the feeding direction of the single paper 201. The same is true for the intervals between the other conveying rollers 77a to 77h.

[0116] In this way, in order for the conveying unit 70 that feeds out a single sheet of paper 201 to be transported along the conveying path 80 by the conveying rollers 77a~77h that constitute the conveying unit 70, the distance between two adjacent conveying units 70 along the conveying path 80 is shorter than the length of the single sheet of paper 201 being transported.

[0117] Therefore, when the front end 201a side of the single paper 201 sent to the print downstream path 87 by the clamping roller 77d reaches the reversing roller 77c in the feeding direction, the area on the rear end 201b side of the single paper 201 may still be passing through the printing unit 30.

[0118] Thus, when the leading end 201a of the sheet 201 contacts the reversing roller 77c during the printing process, if there is a slight difference between the rotation speed of the pinch roller 77d and the rotation speed of the reversing roller 77c, the feeding speed of the sheet 201 changes instantaneously. In this case, due to the change in the feeding speed, a slight misalignment (uneven printing) may occur in the portion of the sheet 201 being printed by the printing unit 30.

[0119] Therefore, in the printer 100, the control unit 95 controls the reverse roller 77c, which contacts the leading end 201a of the paper sheet 201 fed by the pinch roller 77d and being printed by the printing unit 30, to move to a retracted position where it does not contact the paper sheet 201.

[0120] That is, the printer (printer 100 in the embodiment) comprises: a printing section (printing section 30) for printing on a paper (single paper 201), a first driving roller (clamping roller 77d) for allowing the paper to pass through the printing section, and a second driving roller (reversing roller 77c) arranged on the downstream side of the printing section and the first driving roller in the paper feeding direction; the second driving roller can be moved to a retreat position where it does not contact the paper being printed by the printing section.

[0121] In this way, in the printer 100 , the reverse roller 77 c does not come into contact with the sheet of paper 201 being printed, thereby preventing uneven printing from occurring on the sheet of paper 201 .

[0122] In addition, in the above-mentioned printer, on the downstream side of the conveying direction of the conveying path (print downstream path 87) through which the paper to be printed in the printing section passes, there is a paper feed path (paper feed path 81) for reversing the front and back sides of the paper and feeding the paper to the printing section, and the second drive roller is a reversing roller (reversing roller 77c) for feeding the printed paper fed in the paper feed path to the paper feed path.

[0123] In addition, in the above-mentioned printer, the second driving roller is a driving roller (paper feeding roller 77b) which is arranged close to the paper feeding roller and feeds the paper fed by the paper feeding roller to the paper feeding path. The paper feeding roller feeds the paper fed from the paper tray (single paper accommodating portion 21), and the paper feeding roller and the second driving roller are driven by a single motor.

[0124] In the printer 100 in which the paper feed roller 77 b and the reverse roller 77 c are driven by a single motor, the rotation direction of the paper feed roller 77 b and the rotation direction of the reverse roller 77 c are always the same direction of rotation.

[0125] For example, in the case where a single sheet of paper 201 is fed from the single sheet holding portion 21 to the paper supply path 81 in a state of two overlapping sheets (the case of repeated feeding), by controlling the rotation direction of the paper supply roller 77b to the opposite direction, only one of the two single sheets of paper 201 that are repeatedly fed can be pulled back to the single sheet of paper holding portion 21.

[0126] However, when the reverse roller 77 c rotates together with the paper feed roller 77 b , the two overlapped paper sheets 201 are pulled back to the paper accommodating portion 21 , and the overlapped feeding state cannot be released.

[0127] Among them, in a printer with a structure in which the paper supply roller 77b and the reversing roller 77c are driven by different motors respectively, only the paper supply roller 77b can be rotated in the opposite direction, but in a printer in which the paper supply roller 77b and the reversing roller 77c are driven by a single motor, only the paper supply roller cannot be rotated in the opposite direction.

[0128] However, in the printer 100, the reversing roller 77c can be moved to a retreat position where it does not contact the single sheet of paper 201. Therefore, even in the structure where the paper supply roller 77b and the reversing roller 77c are driven by a single motor, when the reversing roller 77c is moved to the retreat position, the rotation of the paper supply roller 77b and the reversing roller 77c is changed to opposite directions, so that the rotation of the reversing roller 77c is not transmitted to the paper 201, and only the rotation of the paper supply roller 77b is transmitted to the single sheet of paper 201.

[0129] Therefore, in the printer 100, even if the structure of the paper supply roller 77b and the reversing roller 77c is driven by a single motor, when the reversing roller 77c is moved to the retracted position, by changing the rotation of the paper supply roller 77b to the opposite direction, only one of the two single sheets of paper 201 that are repeatedly fed out due to the rotation of the paper supply roller 77b can be pulled back to the single sheet accommodating portion 21, and the repeated feeding state can be released.

[0130] (Paper guide opening and closing mechanism) Reference Figures 12 to 16 , the opening and closing mechanism of the paper guide 90 covering the conveyance path 80 will be described as follows. Fig.12 1 is a perspective view of the main parts showing a state where the paper guide 90 is closed. Fig.13 It is a perspective view of the main parts showing a state where the paper guide 90 is opened.

[0131] in addition, Fig.14 2 is a cross-sectional view of the main part showing a state in which the paper guide 90 is closed and the reversing roller 77c is in contact with the single paper 201. Fig.15 2 is a cross-sectional view of the main part showing a state in which the paper guide 90 is closed and the reversing roller 77c is away from the single paper 201. Fig.16 This is a cross-sectional view of the main parts in a state where the paper guide 90 is opened.

[0132] The paper guide 90 is a partition that partitions the conveying path 80 in the thickness direction of the single paper 201 and covers the conveying path 80. Figure 1 , 3 As shown, the paper guide 90 is arranged to be spaced apart from the outer peripheral side of the reversing portion of the curved area across the paper supply path 81 from the print downstream path 87 and including the reversing roller 77 c.

[0133] The paper guide 90 is configured so as to Fig.12 The closed state of the cover conveying path 80 (a curved area that crosses the paper feeding path 81 from the printing downstream path 87 and includes the reversing roller 77c, i.e., the reversing portion) is shown. Fig.13The paper guide 90 can be opened and closed freely in the manner of switching between the open state in which the reversing portion is exposed as shown.

[0134] The paper guide 90 includes a cover plate 91 and side plates 92 integrally provided with the cover plate 91 at both sides of the cover plate 91. The cover plate 91 is formed as a part of the circumference of a cylinder, such as Fig.14 , 15 As shown, the inverted portion is covered from the outer peripheral side. Each side plate 92 is formed to stand up toward the outer side of the peripheral surface of the column with respect to the cover plate 91.

[0135] Each side plate 92 is supported by the shaft 77c2 which is the rotation center of the connecting plate 54. Thus, the paper guide 90 can rotate around the shaft 77c2 like the connecting plate 54, and by this rotation, in the above-mentioned closed state ( Fig.12 , 14 , 15) and the open state ( Fig.13 , 16 )

[0136] In addition, each side plate 92 is supported to be rotatable around the shaft 77c2 in the same manner as the connecting plate 54. Then, each side plate 92 is formed with a long hole 92a through which the shaft 77c1 supporting the reverse roller 77c passes. Figures 14 to 16 As shown, the shaft 77 c 1 is disposed on the outer surface side of the cover plate 91 and passes through the long hole 92 a formed in each side plate 92 .

[0137] The long hole 92a allows the connection plate 54 to rotate relative to each side plate 92 around the axis 77c2. Therefore, the axis 77c1 is formed to extend along the moving range by the connection plate 54 rotating relative to the axis 77c2.

[0138] The range of relative rotation of the connecting plate 54 relative to the side plates 92 is set to be the same as that in the state where the paper guide 90 is closed ( Fig.12 ) is performed, the reverse roller 77c is in a position ( Fig.14 ) and the retreat position from the single paper 201 ( Fig.15 ) corresponds to the moving range of axis 77c1 (arc shape centered on axis 77c2) when moving between.

[0139] That is, the reversing roller 77 c can move between a position in contact with the sheet 201 and a retracted position while the sheet guide 90 is kept closed.

[0140] Two openings 91a are formed along the axial direction of the shaft 77c2 in the cover 91. The openings 91a are holes for allowing the reversing roller 77c supported by the shaft 77c1 disposed on the outer surface side of the cover 91 to be exposed to the conveying path 80 (paper feeding path 81) on the inner surface side of the cover 91 so as to pass through the reversing roller 77c.

[0141] In addition, when the reversing roller 77c is in the retracted position, the reversing roller 77c does not protrude from the inner surface of the cover 91 toward the conveying path 80 side. Therefore, through the retraction control of the reversing roller 77c during printing, the front end of the single sheet of paper 201 being printed will not hook the reversing roller 77c, but will be smoothly delivered along the inner surface of the cover 91.

[0142] In addition, the reversing roller 77c is not a single long object along the axis 77c1, but is configured as two objects distributed in the axial direction. Moreover, the opening 91a formed in the cover plate 91 is not a single long opening in the axial direction, but is formed as two separate openings corresponding to the reversing roller 77c.

[0143] <Function> The printer 100 configured as described above performs printing on the sheet of paper 201 in the following manner. The following operation of printing on the sheet of paper 201 is an example of the operation of the printer 100 .

[0144] First, the printer 100 passes through the sheet delivery roller 77a (see Figure 2 ) rotates to deliver the single sheet 201 stacked on the top layer among the single sheets 201 accommodated in the single sheet accommodating section 21 to the paper supply path 81, and is then transported in the paper supply path 81 by the rotation of the paper supply roller 77b and the rotation of the reversing roller 77c in front of it.

[0145] At this time, the cam member 53 is at the first rotation position. Therefore, the reversing roller 77c is at a position to contact and restrict the paper sheet 201, and the movable guide member 52 is at a position away from both side edges of the paper sheet 201 by a gap L2.

[0146] The sheet 201 fed out in the paper feeding path 81 is in a state of being moved obliquely with respect to the feeding direction, or is skewed due to uneven friction when contacting the reversing roller 77c. Even in such a case, the leading end 201a of the sheet 201 is fed out within the range of the first portion 51b formed as the interval L2 wider than the width W1 of the sheet 201.

[0147] The width of the first part 51b becomes narrower as it moves in the feeding direction. Therefore, when the single paper 201 moves obliquely or skews, before the front end 201a of the single paper 201 reaches the connection part connected to the second part 51a with the narrowest width, any left or right side edge of the single paper 201 begins to contact the first part 51b.

[0148] The portion on the front end 201a side of the sheet 201 in contact with the first portion 51b is fed along the inclination of the first portion 51b (the inclination with respect to the feeding direction formed in a manner that the interval gradually narrows toward the second portion 51a). That is, when the front end 201a of the sheet 201 fed in an obliquely inclined posture is to move straight in the feeding direction while still in an obliquely inclined posture, the feeding direction is corrected in a manner along the first portion 51b, whereby the direction of movement of the portion on the front end 201a side becomes a direction offset from the feeding direction on the rear end 201b side of the sheet 201.

[0149] That is, the moving direction of the portion on the front end 201a side of the single paper 201 is restricted by the first portion 51b, and the portion on the rear end 201b side moves in the feeding direction while being restricted by the reversing roller 77c and moving obliquely. As a result, the moving directions of the portion on the front end 201a side and the portion on the rear end 201b side of the single paper 201 become different, so that non-uniform stress is generated in the width direction W in the middle portion between the portion on the front end 201a side and the portion on the rear end 201b side.

[0150] Then, as a single sheet of paper 201, it becomes impossible to maintain a flat state due to the uneven stress. In order to eliminate the uneven stress, the single sheet of paper 201 is bent in the thickness direction, and one side in the width direction W (relative to the direction of the rear end 201b, the direction of the front end 201a is the side serving as the inner side in the width direction) is bulged in the thickness direction into a mountain shape.

[0151] If the single paper 201 is further fed out, the front end 201a reaches the second portion 51a which is parallel to the feeding direction and has a spacing L1 equal to the width W1 of the single paper 201, and the two side edges of the front end 201a contact the second portion 51a respectively. Figure 8 As shown, the portion on the leading end 201a side of the paper sheet 201 is corrected to an original regular posture in which both side edges are parallel to the feeding direction.

[0152] On the other hand, the portion on the rear end 201b side of the single paper 201 is restricted by the reversing roller 77c and maintained in a state of still moving obliquely, thereby forming a curved portion K in the middle portion between the portion on the front end 201a side and the portion on the rear end 201b side that is greatly raised in a mountain-like state in the thickness direction.

[0153] The state in which the paper sheet 201 is raised in a mountain shape means that the paper sheet 201 is deformed from a flat state extending straight in the feeding direction to a state in which it is slightly convex in the thickness direction.

[0154] The mountain shape is not limited to being visually recognized as a mountain shape as long as it is deformed into a convex shape in the thickness direction of the single paper 201. In addition, the height (deformation amount) of the curved portion K and the width of the curved range are not limited.

[0155] The paper feeding path 81 has a space S that can accommodate the curved portion K of the sheet 201 that is raised in a mountain shape in the thickness direction and expands in the thickness direction of the sheet 201. If there is no such space S, the curved portion K is not formed on the sheet 201 in the paper feeding path 81 during transportation, but plastic deformation occurs at other positions of the sheet 201. For example, when the sheet 201 fed out in an obliquely inclined posture is guided by the guide member 51, the corner portion of the front end side of the feeding direction of the sheet 201 is fed out by the reversing roller 77c in a state of contact with the inner wall constituting the guide member 51.

[0156] As a result, deformation such as bending with creases along the inner wall occurs near the corner of the front end side in the feeding direction of the single paper 201. In such a state, the single paper 201 becomes easy to get stuck in the paper feeding path 81, and even if it can be printed without getting stuck, it becomes a crease.

[0157] In addition, even if the curved portion K of the single paper 201 is within the height range of the guide member 51 (below the height of the wall surface of the guide member 51), the space S of the paper feed path 81 is equivalent to the "space expanding in the thickness direction of the single paper" of the present invention.

[0158] Then, before the front end 201 a of the paper sheet 201 reaches the pinch roller 77 d (downstream roller) disposed downstream in the feeding direction, the pinch roller 77 d moves to the retracted position under the control of the control unit 95 and is not in contact with the paper sheet 201 .

[0159] When the pinch roller 77d has moved to the retracted position, the reversing roller 77c further delivers the paper sheet 201 under the control of the control unit 95. Then, when the leading end 201a of the paper sheet 201 reaches a position in contact with the pinch roller 77d when the pinch roller 77d has returned to the pinched position, the delivery of the paper sheet 201 by the reversing roller 77c is stopped.

[0160] Then, from this state, the cam member 53 starts to rotate from the first rotation position toward the second rotation position under the control of the control unit 95. When the cam member 53 starts to rotate and moves from the first rotation position, the reversing roller 77c immediately moves away from the sheet 201 and moves to the retracted position. As a result, the portion on the rear end 201b side of the sheet 201 is released from the restriction of the reversing roller 77c and can move freely.

[0161] Therefore, if Fig.11 As shown, the single paper 201 uses the restoring force of the bent portion K that is raised in a mountain-like state in the middle part (the force that the bent portion K wants to return to a flat state) as a reference, and the portion on the front end 201a side that is restricted by the second portion 51a and corrected to a regular posture is used as a reference. The portion on the rear end 201b side that is in a free state follows the posture of the portion on the front end 201a side, so that the two side edges are corrected to a regular posture parallel to the feeding direction.

[0162] In this way, the printer 100 of this embodiment can correct the entire posture of a single paper sheet 201 to a normal posture with both side edges parallel to the feeding direction by the action of the guide member 51 and the movement of only the reversing roller 77 c to the retracted position.

[0163] The printer 100 further rotates the cam member 53 toward the second rotation position under the control of the control unit 95. As a result, the gap between the left and right pair of movable guide members 52 is displaced to become narrower, and when the cam member 53 reaches the second rotation position, the movable guide member 52 contacts both side edges of the paper sheet 201, and the posture of the paper sheet 201 can be more reliably corrected to a normal posture (a posture in which both side edges are parallel to the feeding direction).

[0164] That is, as described above, in the printer 100, when the leading end 201a of the sheet of paper 201 reaches the position where the clamping roller 77d has returned to the clamping position, the control unit 95 controls the first rotation position ( Figure 6 , 7 ) of the cam member 53 rotates to the second rotation position ( Fig. 9 , 10 ).

[0165] The cam member 53 starts to rotate toward the second rotational position, as shown in FIG. Fig. 9 , 10 As shown, the second cam 53b presses the connecting plate 54 radially outward of the cam member 53, and the connecting plate 54 rotates around the shaft 77c2, so that the shaft 77c1 supported by the connecting plate 54 rotates forward. As a result, the reversing roller 77c provided on the shaft 77c1 moves to a retracted position away from the single paper 201 clamped by the reversing driven roller 77c3.

[0166] Then, as the cam member 53 further rotates and reaches the second rotation position, the cam surface of the first cam 53a is displaced inward in the width direction W, and the driven member 55 that contacts the cam surface of the first cam 53a and is urged by the spring toward the inner side in the width direction W is displaced inward in the width direction W. As a result, the movable guide member 52 integral with the driven member 55 is also displaced inward in the width direction W, and the pair of movable guide members 52 is reduced to a distance L1.

[0167] Thus, the pair of movable guide members 52 push the side edges on the rear end 201 b side of the paper sheet 201 that is not restricted by the pinch roller 77 d and the reverse roller 77 c toward the inside in the width direction W.

[0168] The interval L2 between the pair of movable guide members 52 is substantially equal to the width W1 of the paper sheet 201 , and each movable guide member 52 is disposed on an extension line in the front-rear direction L of the downstream portion 51 a of the guide member 51 .

[0169] Therefore, even if a single sheet of paper 201 has not been completely corrected to a normal posture by the action of the above-mentioned guide member 51 and the retracting action of the reversing roller 77c, the movable guide member 52 pushes the single sheet of paper 201 and the portion on the rear end 201b side thereof toward the inside in the width direction W, and the two side edges on the rear end 201b side of the single sheet of paper 201 can also contact the movable guide member 52 and the positions of the two side edges can be corrected.

[0170] In this way, even when the guide member 51 alone cannot correct the paper sheet 201 to a proper posture, the printer 100 of this embodiment can reliably correct the paper sheet 201 to a proper posture using the movable guide member 52 .

[0171] After the paper sheet 201 is corrected to the normal posture, the control unit 95 returns the pinch roller 77d from the retreat position to the pinch position in contact with the paper sheet 201. Thus, the paper sheet 201 is restrained by the pinch roller 77d in a state where the overall posture is corrected to the normal posture.

[0172] Then, the pinch roller 77 d rotates under the control of the control unit 95 , whereby the sheet of paper 201 is fed from the paper feed path 81 to the print path 82 while maintaining a normal posture.

[0173] In addition, after the single paper 201 is sent to the printing path 82, under the control of the control unit 95, the cam member 53 returns from the second rotation position to the first rotation position, the movable guide member 52 returns to the wide interval L2, and the reversing roller 77c returns to a position capable of clamping the single paper 201.

[0174] The single sheet 201 advancing in the print path 82 is guided to the print upstream path 86 by switching of the print discharge switching plate 72 .

[0175] If the front end of the single sheet of paper 201 advances to the end of the printing upstream path 86, the clamping roller 77d reverses (the direction of rotation becomes opposite), and the single sheet of paper 201 is fed out in the printing path 82 while being printed on the surface (front) of the single sheet of paper 201 by the printing unit 30, and advances to the printing downstream path 87.

[0176] The leading end of the single sheet of paper 201 that has advanced from the printing path 82 to the printing downstream path 87 and has completed printing on the front surface advances to the paper supply path 81 and contacts the reversing roller 77c, and is conveyed again in the paper supply path 81 by the rotation of the reversing roller 77c.

[0177] The sheet of paper 201 sent from the print downstream path 87 to the paper feed path 81 is in a reversed state with the front and back sides turned over. Then, when the turned-over sheet of paper 201 is conveyed in the paper feed path 81, the skew of the sheet of paper 201 is corrected again by the skew correction mechanism 50, and the sheet of paper 201 is corrected to a normal posture.

[0178] In this way, the paper sheet 201 in a state in which the posture is corrected is guided from the printing path 82 to the printing upstream path 86 .

[0179] In addition, the printer 100 may include the guide member 51 of the skew correction mechanism 50 in the downstream printing path 87 through which the sheet 201 whose surface has been printed passes, in addition to the paper feed path 81 which is also a path for reversing the front and back sides of the sheet 201 whose surface has been printed. In this case, the downstream printing path 87 corresponds to the conveying path, the clamp roller 77d corresponds to the driving roller, and the reversing roller 77c corresponds to the downstream roller, and therefore, the pair of left and right guide members 51 is provided in the portion near the reversing roller 77c in the downstream printing path 87. In addition, the printer 100 may also include the guide member 51 in the upstream printing path 86 or the discharge path 83.

[0180] The sheet of paper 201 whose skew has been corrected is returned from the print upstream path 86 to the print path 82 , while being printed on the back side of the sheet of paper 201 by the print unit 30 , and then moves toward the print downstream path 87 .

[0181] The single sheet 201 that has advanced from the print path 82 to the print downstream path 87 and has completed printing on the back side passes through the print path 82 where the rotation direction of the pinch roller 77d is changed to the opposite direction, switches the print discharge switching plate 72, and is transported to the discharge path 83. The single sheet 201 sent to the discharge path 83 is conveyed from the pinch roller 77d to the feed roller 77e.

[0182] In the discharge path 83, the single paper 201 passes through the cutting unit 40 and moves forward due to the rotation of the feed roller 77e. The cutting unit 40 cuts off the unnecessary portion of the rear end of the single paper 201 in the feeding direction. The cut unnecessary portion of the single paper 201 falls into the waste box 16 (see Figure 2 ), accumulated in the inside of the trash box 16.

[0183] The sheet 201 with the unnecessary portion of the rear end cut off is advanced forward by the rotation of the feed roller 77e and is conveyed to the first discharge roller 77f. The sheet 201 is conveyed by the rotation of the first discharge roller 77f, but when the discharge path switching member 71 is switched to the lower side at the branch portion, the sheet 201 is guided to the upper discharge path 85, and the second discharge roller 77g disposed near the upper discharge outlet 13b rotates, and the sheet 201 is discharged from the upper discharge outlet 13b to the stacking portion 12a.

[0184] On the other hand, when the branch portion of the discharge path switching member 71 is switched to the upper side, the paper sheet 201 is guided to the front discharge path 84 and discharged to the outside of the printer 100 from the front discharge outlet 13 a .

[0185] (Control of the printing position on the back of the table) Here, the control performed by the control unit 95 to drive the pinch roller 77 d and feed the sheet of paper 201 when printing is performed on the front and back sides of the sheet of paper 201 will be described below.

[0186] As described above, whether the printer 100 prints on the front side or the back side of the paper sheet 201 , the printer 100 prints by the printing unit 30 while feeding the paper sheet 201 from the printing path 82 to the printing downstream path 87 .

[0187] When the sheet of paper 201 is reversed from the front to the back, the end of the sheet of paper 201 in the length direction is also reversed. That is, when one end of the sheet of paper 201 in the length direction is, for example, end A and the other end is, for example, end B, when printing on the front of the sheet of paper 201, the sheet of paper 201 is fed out with end A as the leading end, but when the front and back of the sheet of paper 201 are reversed, the leading end of the feeding direction of the sheet of paper 201 is reversed from end A to end B, so when printing on the back of the sheet of paper 201, the sheet of paper 201 is fed out with end B as the leading end.

[0188] Therefore, in printing on the surface and the back of a single sheet of paper 201, if the front end of the single sheet of paper 201 in the feeding direction is used as a reference for printing, or the rear end of the single sheet of paper 201 in the feeding direction is used as a reference for printing, the printing on the surface of the single sheet of paper 201 is, for example, printed at a position based on the A end, and the printing on the back of the single sheet of paper 201 is, for example, printed at a position based on the B end.

[0189] Then, when the length of the printed content (image, etc.) is significantly shorter than the length of the sheet 201 (the length between the A end and the B end), the printed content is biased toward the A end on the front side of the sheet 201, and toward the B end on the back side of the sheet 201. That is, the end side where the printed content is biased becomes different on the front side and the back side of the sheet 201. Furthermore, even if the blank area without printed content is to be cut, it cannot be cut because the blank area on the front side and the back side of the sheet 201 are not consistent.

[0190] To solve such a problem, the printer 100 of this embodiment controls the feeding of the paper 201 by setting the reference position for feeding the paper 201 as the predetermined position of the paper 201 itself, regardless of whether printing is performed on the front or back side of the paper 201.

[0191] That is, in the printer 100, the control unit 95 controls the feeding of the single sheet of paper 201 by using the basis for feeding the single sheet of paper 201 as the prescribed position of the single sheet of paper 201 itself, in such a way that the printed content is biased toward the A end or the printed content is biased toward the B end regardless of whether it is on the front or back side of the single sheet of paper 201.

[0192] Specifically, Figure 2 As shown, the printer 100 includes a first sensor 96 and a second sensor 97. The first sensor 96 and the second sensor 97 are both optical sensors that detect the passage of the sheet of paper 201 by a change in the amount of light generated by the passage of the sheet of paper 201, for example.

[0193] The first sensor 96 is provided downstream of the printing unit 30 in the printing path 82 (close to the printing upstream path 86 ). The first sensor 96 detects the leading end of the paper 201 in the feeding direction when the paper 201 is fed from the printing path 82 to the printing upstream path 86 .

[0194] The second sensor 97 is disposed upstream of the printing path 82 (close to the paper feeding path 81) and upstream of the pinch roller 77d. The second sensor 97 detects the leading end of the paper 201 in the feeding direction when the paper 201 is fed from the printing path 82 to the printing downstream path 87.

[0195] Moreover, the control unit 95 sets the printing start position based on the detection result of the first sensor 96 when printing on the front side of the single paper 201, and sets the printing start position based on the detection result of the second sensor 97 when printing on the back side of the single paper 201.

[0196] When printing on the surface of the paper sheet 201, the control unit 95 first feeds the paper sheet 201 from the printing path 82 to the printing upstream path 86 via the clamp roller 77d. At this time, the first sensor 96 detects the front end (eg, end A) of the paper sheet 201 in the feeding direction.

[0197] The control unit 95 uses the detection of the A end of the paper sheet by the first sensor 96 as a reference for feeding, and feeds the paper sheet 201 to the print upstream path 86 by a preset first length (eg, length M1) via the pinch roller 77 d.

[0198] For example, when the motor that rotates the clamp roller 77d is a stepping motor, the preset first length is set to the first step number of the stepping motor driven by the control unit 95. The first length is set to a length longer than the length of the printed content (e.g., length M0) printed on the surface (M1>M0).

[0199] Thereafter, the control unit 95 controls the rotation direction of the pinch roller 77d to the opposite direction to feed the sheet of paper 201 from the printing path 82 to the downstream printing path 87, and controls the printing unit 30 to start printing on the surface of the sheet of paper 201. At this time, the front end of the feeding direction of the sheet of paper 201 is the B end, but the printing on the surface of the sheet of paper 201 is performed with the A end of the sheet of paper 201 as the reference.

[0200] That is, on the surface of the single paper 201, the print content is printed from a position at a predetermined first length from the A end toward the A end, thereby printing corresponding to the length of the print content. Therefore, the range of the single paper 201 from the A end to the position of the length obtained by subtracting the length of the print content (=M1-M0) from the first length is used as blank space.

[0201] The single sheet 201 that has been printed on the front side is fed to the paper feed path 81 from the print downstream path 87 by the reversing roller 77c with the B end as the front end in the feeding direction, and the front and back sides are reversed. The single sheet 201 that has been fed out and turned over in the paper feed path 81 with the B end as the front end in the feeding direction is guided to the print path 82 by the pinch roller 77d, and is further fed to the print upstream path 86.

[0202] Then, when the end A, which is the rear end in the feeding direction of the sheet of paper 201, passes through the second sensor 97, the second sensor 97 detects the rear end (end A) of the sheet of paper 201. The control unit 95 uses the detection of the end A of the sheet of paper 201 by the second sensor 97 as a reference for feeding, and feeds the sheet of paper 201 to the print upstream path 86 by a preset second length (for example, length M2) through the pinch roller 77d.

[0203] For example, when the motor that rotates the clamp roller 77 d is a stepping motor, the preset second length is set to a predetermined second number of steps by which the control unit 95 drives the stepping motor.

[0204] Furthermore, the second length is set to a length obtained by subtracting the length of the printed content from the first length when printing on the surface (M2=M1-M0).

[0205] Thereafter, the control unit 95 controls the rotation direction of the pinch roller 77d to the opposite direction to feed the sheet of paper 201 from the printing path 82 to the downstream printing path 87, and controls the printing unit 30 to start printing on the front surface of the sheet of paper 201. At this time, the front end of the feeding direction of the sheet of paper 201 is referred to as the A end, but the printing on the back side of the sheet of paper 201 is performed with the A end of the sheet of paper 201 as the reference.

[0206] That is, on the back side of the single paper 201, the area from the A end to a position a predetermined second length (M2) away is left blank, and the printing content is printed from the second position toward the B end, and printing corresponding to the length of the printing content is performed from the position a second length away from the A end.

[0207] Thus, regardless of the front or back side of the single paper 201, the printer 100 can use the range of the second length (M2) away from the end (end A) of one side of the single paper 201 itself as a blank space, and then print the print content within the range of the blank space up to the position of the length (M0) of the print content.

[0208] Therefore, regardless of the front or back side of the single paper 201, the range from the position at a distance of length (M2+M0) from the A end to the B end can be used as a common blank area, and even if the blank area is cut by the cutting unit 40, it will not affect the printed content on the front or back side.

[0209] In this way, the printer 100 has: a clamping roller 77d, which serves as a conveying unit for delivering a single sheet of paper 201; a printing unit 30, which prints the single sheet of paper 201 while delivering the single sheet of paper 201 in one direction through the clamping roller 77d; and a control unit 95, which controls the delivery of the single sheet of paper 201 by taking the reference position of the delivery of the single sheet of paper 201 as the determined position of the single sheet of paper 201 itself, without being limited to the difference between the front and back sides of the single sheet of paper 201 when printing on the surface of the single sheet of paper 201 through the printing unit 30 and when printing on the back side of the single sheet of paper 201.

[0210] Furthermore, the printer 100 uses one end of the paper sheet 201 in the feeding direction as a reference position for feeding.

[0211] Moreover, the printer 100 has a first sensor 96 and a second sensor 97 for detecting the end of one side of the single paper 201 on the upstream side and the downstream side of the clamping roller 77d serving as a conveying unit in the feeding direction of the single paper 201, respectively. When printing on the front surface of the single paper 201 and printing on the back surface, the control unit 95 uses the detection result of the first sensor 96 on the upstream side and the detection result of the second sensor 97 on the downstream side to determine the feeding reference position.

[0212] <Effect> As described above, the printer 100 of this embodiment can correct the skew of the paper sheet 201 by making the posture and direction of the paper sheet 201 appropriate using the skew correction mechanism 50 .

[0213] In the printer 100 of this embodiment, the left and right cam members 53 are fixed to the shaft 52a, so the left and right cam members 53 can be rotated in conjunction with the rotation of the shaft 52a.

[0214] Therefore, the printer 100 of this embodiment can be configured to have only one motor that rotates the shaft 52a. Compared with a structure in which a motor is provided on each movable guide member 52 and each movable guide member 52 is moved, the skewness of a single sheet of paper 201 can be corrected with a simple structure that reduces the number of components.

[0215] In addition, in the printer 100 of the present embodiment, the second cam 53b, which serves as a retraction member for retracting the reversing roller 77c to a position where it does not contact the single paper 201, and the first cam 53a, which enables the movable guide member 52 to move within a movable range, are integrally formed as the cam member 53, so that the movement of the reversing roller 77c (retreat to the retraction position) and the movement of the movable guide member 52 (movement to a position where it contacts the two side edges of the single paper 201, respectively) can be linked.

[0216] In the printer 100 of the present embodiment, the action of retreating the reversing roller 77c from the single paper 201 and pressing the two side edges of the single paper 201 toward the inside in the width direction W by the movable guide member 52 is described as being performed only once, but the positive rotation and reverse rotation of the cam member 53 between the first rotation position and the second rotation position may be repeated multiple times as the action of pressing the two side edges of the single paper 201 toward the inside in the width direction W multiple times.

[0217] In addition, by rotating the cam member 53 from the first rotation position to the second rotation position in a short time, the movable guide member 52 applies a collision by knocking the two side edges of the single paper 201 inward in the width direction W, thereby improving the effect of correcting the skewness of the single paper 201.

[0218] In addition, the printer 100 of the present embodiment can be used in a state where the paper guide 90 is not opened ( Fig.13 , 16 ) and is still closed ( Fig.12 ), the reverse roller 77c is moved to the retracted position ( Fig.15 ).

[0219] Furthermore, in the printer 100, when a paper jam (blockage) of the single paper 201 occurs in the reversing section, the paper guide 90 is opened ( Fig.13 , 15 ), the reversing roller 77c can also be integrated with the paper guide 90 and be separated from the reversing portion.

[0220] Therefore, in the printer 100 , when the paper guide 90 is opened, accessibility to the reversing section can be improved compared to a printer with a configuration in which the reversing roller 77 c remains in the reversing path, and a single paper 201 stuck in the reversing section can be easily removed.

[0221] In addition, the openings 91a formed on the cover plate 91 and passing through the reversing roller 77c are distributed in the axial direction. This structure is in a state where the plate surface of the cover plate 91 that is not an opening remains between the two openings 91a. On the other hand, in a structure formed by a single opening that is long in the axial direction, the edge of the opening extends long in the axial direction, so that the plate surface of the cover plate 91 does not remain.

[0222] In this way, in the case of a structure in which the opening 91a passing through the reversing roller 77c is formed by a single opening that is long in the axial direction, in the single opening 91a, there is no portion that supports the single paper 201 within the range of the length and width of the opening 91a. For example, in the single paper 201, if the opening 91a side is easily deformed and has a mark, the front end 201a of the single paper 201 becomes easy to deform into a convex shape so as to enter the opening 91a.

[0223] Therefore, in the printer 100, in the case of a structure in which the plate surface of the cover plate 91 remains, compared with a structure formed by a single opening that is long in the axial direction, since the portion of the plate surface remaining between the two narrow openings 91a supports the single paper 201, even if the single paper 201 is easily deformed on the opening 91a side and leaves a mark, it is difficult to deform to the extent of entering the narrow opening 91a. Therefore, in the case of a structure in which the plate surface of the cover plate 91 remains, when the leading end 201a of the single paper 201 during printing passes through the reversing portion in a state in which the reversing roller 77c is moved to the retracted position, it is possible to reduce the possibility that the leading end 201a of the single paper 201 is caught on the edge of the opening.

[0224] The printer 100 of this embodiment shows an example in which the guide member (guide member 51) and the movable guide member (movable guide member 52) are used to correct the oblique movement of the sheet of paper 201, but the printer of the present invention is not limited to having the movable guide member. That is, depending on the application of the printer 100, when only the guide member (guide member 51) is sufficient to correct the oblique movement of the sheet of paper 201, the movable guide member (movable guide member 51) may not be provided.

[0225] The printer 100 of the present embodiment is a sublimation thermal printer, but the printer of the present invention is not limited to a sublimation thermal printer and may be a printer of other printing formats other than a sublimation thermal printer.

[0226] That is, the printer of the present invention may be a thermal printer other than a sublimation type, may be a printer other than a thermal printer, for example, an inkjet type, or may be a printer of another printing format.

[0227] The printer 100 of this embodiment has been described as printing on both sides of the paper sheet 201 . However, the printer of the present invention may print on only one side of the paper sheet.

[0228] The printer 100 of this embodiment is a printer that can print on long roll paper 202 in addition to single sheets of paper 201 cut into a predetermined length, but the printer of the present invention can also be a printer that only prints on single sheets of paper, that is, a printer that cannot accommodate roll paper.

[0229] Cross-references to related applications This application claims priority based on Japanese Patent Application No. 2022-116431 filed with the Japan Patent Office on July 21, 2022, the entire disclosure of which is incorporated herein by reference in its entirety.

Claims

1. A printer, wherein: have: The transport path for single sheets of paper to pass through, a driving roller for delivering the single sheet of paper along the conveying path, and disposed in an upstream region of the conveying path in a direction in which the single sheet of paper is delivered, a downstream roller provided on the downstream side of the conveying path in the feeding direction, and restricting the single sheet passing through the conveying path; and a pair of guide members, arranged outside the two side edges of the single paper passing through the conveying path, restricting the positions of the two side edges of the single paper, thereby guiding the single paper; The pair of guide members each have a first portion located on the upstream side of the delivery direction and a second portion located on the downstream side, The interval between the pair of guide members gradually narrows toward the paper feeding direction in such a manner that the interval between the portions of the first portion closest to the driving roller is wider than the width of the paper, the portion of the first portion closest to the second portion is formed with the width of the single paper, and the second portion is formed with the width of the single paper, When the area between the driving roller and the second portion is divided into two equal parts, namely, a first area on the upstream side and a second area on the downstream side in the feeding direction, a portion of the first portion closest to the driving roller is arranged in the first area. The conveying path has a space that expands in the thickness direction of the single paper, and the space can accommodate a curved portion of the single paper that is raised in a mountain shape between the front end side portion of the single paper whose direction is corrected by being restricted by the second portion and the rear end side portion of the single paper restricted by the driving roller.

2. The printer according to claim 1, wherein: have: a retracting member for retracting the driving roller to a position where the driving roller does not contact the single sheet of paper when the leading end of the single sheet of paper in the feeding direction has reached the second portion; a movable guide member disposed between the driving roller and the guide member so as to be movable from a position away from both side edges of the single paper to a position in contact with the both side edges; as well as The moving member moves the movable guide member within the movable range in a state where the driving roller is retracted.

3. The printer according to claim 2, wherein: The printer is provided with an adjustment mechanism that limits a position of the movable guide member moving toward a side contacting the both side edges of the sheet of paper within the movable range of the movable guide member and adjusts the moved position.

4. The printer according to claim 2, wherein: The retracting member is formed integrally with the moving member, and the driving roller is retracted to a position not in contact with the sheet of paper and the movable guide member is moved to a position in contact with the two side edges in a linked manner.

5. The printer according to any one of claims 1 to 4, wherein: The positions of the movable guide member in contact with both side edges of the paper sheet are set to be arranged on the extension line of the second portion.

6. The printer according to claim 4, wherein: The printer prints on both sides of the single sheet of paper. The conveyance path provided with the guide member is a path that is passed when printing on one side of the sheet of paper and is also passed when printing on the other side of the sheet of paper after printing on the one side of the sheet of paper is completed.

7. The printer according to claim 6, wherein: The transport path provided with the guide member includes the following two paths: a path traversed when printing the surface on the one side and when printing the surface on the other side, and The sheet of paper passes through a printing downstream path after the side on one side is printed and after the side on the other side is printed.

8. The printer according to any one of claims 1 to 3, wherein: The moving member moves the movable guide member to a position where the movable guide member contacts the two side edges respectively in a state where the feeding of the single paper is stopped.

9. The printer according to claim 8, wherein: The moving member repeatedly moves the movable guide member from a position away from the two side edges to a position in contact with the two side edges in a state where the feeding of the single paper is stopped.

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