Foreign matter removing device and printing device

Abstract

The present invention relates to a foreign matter removing device and a printing device, and even if a center of a medium in a long side direction of a cleaning roller deviates from a first end portion of a rotation shaft of the cleaning roller, inclination of the cleaning roller can be suppressed. The cleaning roller which contacts the medium has a rotation shaft having a first end portion and a second end portion, and an adhesive roller mounted to the rotation shaft. A cleaning roller holder has a first bearing portion which limits a movement range of the first end portion, and a second bearing portion which limits a movement range of the second end portion. The cleaning roller holder positions the cleaning roller in a detachable manner in a state where the first end portion is disposed at the first bearing portion and the second end portion is disposed at the second bearing portion. A center of gravity of the cleaning roller deviates from the first end portion in a long side direction of the cleaning roller, and is within a range where the adhesive roller exists in the long side direction.

Description

Technical Field

[0001] The present invention relates to a foreign matter removal device and a printing device including a cleaning roller and a cleaning roller holder. Background Art

[0002] As a printing device, as shown in Patent Document 1, there is a known line-type inkjet printer that prints on the surface of a long strip of recording paper by driving and controlling a print head. If foreign matter such as paper dust adheres to the recording paper, the foreign matter may sometimes adhere to the print head, causing clogging of the print head nozzle. Therefore, it is considered to configure a foreign matter removal device with a cleaning roller upstream of the print head in the conveying direction of the recording paper. The cleaning roller has adhesive properties on its surface and removes foreign matter from the surface of the recording paper by contacting the surface of the recording paper.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-193561

[0004] It is desirable to be able to switch between multiple types of recording paper with different widths for use in the printing device. Here, if the center of the long recording paper deviates from the center of the cleaning roller in the width direction, there is a possibility that the cleaning roller may tilt, thereby reducing the foreign matter removal performance or generating abnormal noise.

[0005] It should be noted that the above-mentioned problem is not limited to line inkjet printers, but also occurs in various printing devices such as serial printers and various foreign matter removal devices. Summary of the Invention

[0006] The foreign matter removal device of the present invention has the following mode: the foreign matter removal device includes a cleaning roller and a cleaning roller holder, the cleaning roller contacts the medium, the cleaning roller includes: a rotating shaft having a first end and a second end, the second end being located on the side opposite to the first end; and an adhesion roller having adhesion on the surface and mounted on the rotating shaft, the cleaning roller holder includes: a first bearing portion for limiting the movement range of the configured first end portion; and a second bearing portion for limiting the movement range of the configured second end portion, the cleaning roller holder positions the cleaning roller in a removable manner when the first end portion is configured on the first bearing portion and the second end portion is configured on the second bearing portion, the center of gravity of the cleaning roller deviates toward the first end portion from the center in the long side direction of the cleaning roller and is within the range where the adhesion roller exists in the long side direction.

[0007] In addition, the printing device of the present invention has the following mode: the printing device includes: a conveying unit that conveys a recording medium in a conveying direction; a guide unit that guides the recording medium conveyed by the conveying unit; a print head that prints on the recording medium; and a foreign matter removal device that is arranged upstream of the print head in the conveying direction, the guide unit includes a first guide and a second guide, the first guide guides one edge of the recording medium in the width direction of the conveying path of the recording medium, and the second guide guides the other edge of the recording medium in the width direction, the first guide cannot move in the width direction, and the second guide can move in the width direction, the printing device can print on the first recording medium and the second recording medium as the recording media, the second recording medium being wider in the width direction than the first recording medium. , the first recording medium and the second recording medium are positioned in the width direction based on the first guide member, the foreign matter removal device includes a cleaning roller and a cleaning roller holder, the cleaning roller contacts the recording medium, the cleaning roller includes: a rotating shaft having a first end portion and a second end portion, the second end portion being located on the side opposite to the first end portion; and an adhesion roller having adhesion on the surface and mounted on the rotating shaft, the cleaning roller holder includes: a first bearing portion for limiting the movement range of the configured first end portion; and a second bearing portion for limiting the movement range of the configured second end portion, the cleaning roller holder positions the cleaning roller in a removable manner when the first end portion is configured on the first bearing portion and the second end portion is configured on the second bearing portion, and the center of gravity of the cleaning roller is located at a position overlapping with the first recording medium in the width direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a perspective view schematically showing an example of a printing apparatus including a foreign matter removal device.

[0009] Figure 2 This is a diagram schematically showing an example of the interior of a printing device.

[0010] Figure 3 This is a perspective view schematically illustrating the vicinity of a guide portion of a printing device.

[0011] Figure 4 This is an exploded view schematically showing an example of a foreign matter removal device.

[0012] Figure 5 It is a perspective view schematically showing an example of a cleaning roller holder.

[0013] Figure 6It is a plan view schematically showing an example of a cleaning roller holder.

[0014] Figure 7 It is a left side view schematically illustrating the gap between the first bearing portion and the first end portion.

[0015] Figure 8 It is a right side view schematically illustrating the gap between the second bearing portion and the second end portion.

[0016] Figure 9 This is a diagram schematically showing an example in which a second recording medium having a relatively wide width is passed through the foreign matter removal device.

[0017] Figure 10 This is a diagram schematically showing an example in which a first recording medium having a relatively narrow width is passed through the foreign matter removal device.

[0018] Figure 11 This is a diagram schematically showing an example of the foreign matter removal device in a state where the second end portion is in contact with the upper end of the second restricting portion.

[0019] Figure 12 This is an exploded view schematically showing an example of a foreign matter removal device including a heavy object attached to a rotating shaft.

[0020] Figure 13 This is a diagram schematically showing a foreign matter removal device according to a comparative example in which the center of gravity of the cleaning roller is located at the center in the longitudinal direction of the cleaning roller.

[0021] Description of Reference Numerals

[0022] 1…foreign matter removal device; 10…cleaning roller; 20…rotating shaft; 21…first end portion; 22…second end portion; 23…first region; 24…second region; 25…large diameter portion; 29…weight; 30…adhesive roller; 30a, 30b…end portions; 31…surface; 40…cleaning roller holder; 50…first bearing portion; 50b…lower portion; 51…inner sheet; 52…middle sheet; 53…outer sheet; 60…second bearing portion; 60b…lower portion; 61…Inner sheet; 62…Middle sheet; 63…Outer sheet; 71…First limiting portion; 71a…Upper end; 72…Second limiting portion; 72a…Upper end; 73…Third limiting portion; 74…Fourth limiting portion; 75…Fifth limiting portion; 76…Sixth limiting portion; 80…Bottom; 81…Upper surface; 82…Recess; 100…Printing device; 110…Conveying portion; 120…Guide; 121…First guide; 122…Second guide; 12 3…base; 124…sliding mechanism; 125…lock release lever; 130…print head; 131…head unit; 135…platen unit; 135a…platen surface; 140…housing; 144…paper discharge port; AR1…center of gravity area; AX1…center line; C1…conveyor path; CE1…center; CG1…center of gravity; CL1, CL2…gaps; D1…longitudinal direction; D2…gravity direction; D3…cross direction; D4…conveyor Feeding direction; D5…width direction; L0…total length; L1, L2…length; L3, L4…distance; ME0…recording medium; ME0a, ME0b…edge portion; ME1…first recording medium; ME2…second recording medium; R0…diameter of adhesion roller; R1…first diameter; R2…second diameter; R3…diameter of first end portion; R4…diameter of second end portion; W1…width of first recording medium; W2…width of second recording medium. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention. Of course, the following embodiments are merely examples of the present invention, and not all of the features shown in the embodiments are essential to the solution of the invention.

[0024] (1) Overview of the technology included in the present invention:

[0025] First, refer to Figures 1 to 13 The examples shown illustrate an overview of the technology included in the present invention. It should be noted that the figures in this application are schematic illustrations of examples, and sometimes the magnifications shown in these figures vary in direction, and sometimes the figures do not match. Of course, the elements of the present technology are not limited to the specific examples shown in the accompanying figures. In the "Overview of the Technology Included in the Present Invention," the terms in parentheses are supplementary explanations of the immediately preceding term.

[0026] In addition, in this application, the numerical range "Min to Max" means a range from a minimum value Min to a maximum value Max.

[0027] Method 1

[0028] A foreign matter removal device 1 according to one embodiment of the present technology includes a cleaning roller 10 and a cleaning roller holder 40 that are in contact with a medium (e.g., a recording medium ME0). The cleaning roller 10 includes: a rotating shaft 20 having a first end 21 and a second end 22 on the opposite side of the first end 21; and an adhesive roller 30 having adhesiveness on a surface 31 and mounted on the rotating shaft 20. The cleaning roller holder 40 includes: a first bearing portion 50 that limits the range of movement of the configured first end 21; and a second bearing portion 60 that limits the range of movement of the configured second end 22. The cleaning roller holder 40 positions the cleaning roller 10 in a removable manner in a state where the first end 21 is configured on the first bearing portion 50 and the second end 22 is configured on the second bearing portion 60. As Figure 4 As exemplified in FIG. 1 , the center of gravity CG1 of the cleaning roller 10 is offset from the center CE1 of the cleaning roller 10 in the longitudinal direction D1 toward the first end portion 21 and is within a range where the adhesion roller 30 exists in the longitudinal direction D1 .

[0029] like Figure 13 As illustrated, when the center of gravity CG1 of the cleaning roller 10 is at the center CE1 in the longitudinal direction D1 of the cleaning roller 10, if the end of the medium (ME0) on the second end 22 side is located closer to the first end 21 of the rotating shaft 20 of the cleaning roller 10 than the center CE1 in the longitudinal direction D1 of the cleaning roller 10, the cleaning roller 10 may tilt with the second end 22 side lowered. If the cleaning roller 10 tilts, the foreign matter removal performance may be reduced or abnormal noise may be generated.

[0030] If Figure 4 、 10 As shown in the example, if the center of gravity CG1 of the cleaning roller 10 is within the range of the embodiment 1, even if the end of the medium (ME0) on the side of the second end 22 is located closer to the first end 21 of the rotation shaft 20 of the cleaning roller 10 than the center CE1 in the longitudinal direction D1 of the cleaning roller 10, the cleaning roller 10 in contact with the medium (ME0) can be suppressed from tilting. Therefore, the embodiment 1 can provide a foreign matter removal device that can suppress tilting of the cleaning roller even if the end of the medium on the side of the second end of the rotation shaft of the cleaning roller in the longitudinal direction of the cleaning roller is located closer to the first end of the rotation shaft of the cleaning roller than the center of the cleaning roller.

[0031] Here, the recording medium includes roll paper, multi-page paper, and the like.

[0032] In this application, the terms "first," "second," etc. are used to identify various structural elements among multiple structural elements having similarities, and do not indicate order. Which of the multiple structural elements corresponds to "first," "second," etc. is determined relatively.

[0033] It should be noted that the above additional instructions are also applicable in the following manner.

[0034] Method 2

[0035] like Figure 4 As illustrated, the rotating shaft 20 may include a first region 23 having a first diameter R1 and a second region 24 having a second diameter R2 that is smaller than the first diameter R1 and located closer to the second end 22 than the first region 23. The diameter of the adhesive roller 30 at a location overlapping the first region 23 and the diameter of the adhesive roller 30 at a location overlapping the second region 24 may be equal. Since the rotating shaft 20 includes the first region 23 having the first diameter R1 and the second diameter R2 that is smaller than the first diameter R1, and the diameter R0 of the adhesive roller 30 is equal at a location overlapping the first region 23 and at a location overlapping the second region 24, the center of gravity CG1 of the cleaning roller 10 can be positioned closer to the first end 21 than the center CE1 in the longitudinal direction D1 of the cleaning roller 10, and the diameter of the cleaning roller 10 can be made uniform, achieving excellent foreign matter removal performance. Therefore, this embodiment provides a suitable example of shifting the center of gravity of the cleaning roller toward the first end.

[0036] Method 3

[0037] like Figure 12 As shown, the cleaning roller 10 may include a weight 29 mounted on the rotating shaft 20 closer to the first end 21 than the adhesion roller 30. This embodiment can also provide a suitable example of shifting the center of gravity of the cleaning roller toward the first end.

[0038] Method 4

[0039] like Figures 4-6As shown in the examples, the first bearing portion 50 may include a first limiting portion 71, which limits the movement of the first end portion 21 in the direction of gravity D2. The second bearing portion 60 may include a second limiting portion 72, which limits the movement of the second end portion 22 in the direction of gravity D2. Alternatively, in the direction of gravity D2, the upper end 72a of the second limiting portion 72 is located at a higher position than the upper end 71a of the first limiting portion 71. Thus, the higher second limiting portion 72 limits the cleaning roller 10 from tilting with a tendency to lower on the side of the second end portion 22. Therefore, this method can provide a suitable example for suppressing the tilting of the cleaning roller.

[0040] Method 5

[0041] like Figures 4-6 As exemplified in FIG. 1 and FIG. 2 , the cleaning roller holder 40 may include a bottom portion 80 connecting the lower portion 50b of the first bearing portion 50 and the lower portion 60b of the second bearing portion 60. Figure 8 As illustrated, when the first end portion 21 is disposed on the first bearing portion 50, the second end portion 22 is disposed on the second bearing portion 60, and the cleaning roller 10 is placed on the bottom portion 80, a gap CL2 in the gravity direction D2 may exist between the second end portion 22 and the second limiting portion 72. This embodiment provides a suitable structure for removing foreign matter because the cleaning roller 10 is in full contact with the medium (ME0).

[0042] Method 6

[0043] like Figure 6 As illustrated, the bottom portion 80 may include an upper surface 81, and a portion P2 of the upper surface 81, located closer to the second end portion 22 than the center CE1 in the longitudinal direction D1, of a portion P1 overlapping the cleaning roller 10 in a plan view, may include a recess 82 that overlaps with the center line AX1 of the rotating shaft 20. This configuration makes it difficult for the cleaning roller 10 to contact the bottom portion 80 of the cleaning roller holder 40 when the cleaning roller 10 tilts toward the second end portion 22, thereby providing a suitable structure for suppressing the generation of abnormal noise.

[0044] Method 7

[0045] like Figure 5As illustrated in the examples of , the first bearing portion 50 may include: a third limiting portion 73 that limits movement toward one side (for example, the Y1 direction) in the intersection direction D3 that intersects the gravity direction D2 and the long side direction D1 of the cleaning roller 10; and a fourth limiting portion 74 that limits movement toward the other side (for example, the Y2 direction) in the intersection direction D3 that intersects the gravity direction D2 and the long side direction D1 of the cleaning roller 10. Alternatively, the second bearing portion 60 may include: a fifth limiting portion 75 that limits movement toward the one side (Y1 direction) in the intersection direction D3; and a sixth limiting portion 76 that limits movement toward the other side (Y2 direction) in the intersection direction D3. As Figure 7 As shown in the example, the distance L3 between the third limiting portion 73 and the fourth limiting portion 74 may be greater than the diameter R3 of the first end portion 21. Figure 8 As illustrated, the distance L4 between the fifth restriction portion 75 and the sixth restriction portion 76 may be larger than the diameter R4 of the second end portion 22. This embodiment can provide a suitable example of detachably positioning the cleaning roller.

[0046] Method 8

[0047] A printing device 100 according to one embodiment of the present technology includes: a conveying unit 110 that conveys a recording medium ME0 in a conveying direction D4; a guide unit 120 that guides the recording medium ME0 as it is conveyed by the conveying unit 110; a print head 130 that prints on the recording medium ME0; and a foreign matter removal device 1 positioned upstream of the print head 130 in the conveying direction D4. The guide unit 120 includes a first guide 121 that guides one edge ME0a of the recording medium ME0 in the width direction D5 of a conveying path C1 of the recording medium ME0; and a second guide 122 that guides the other edge ME0b of the recording medium ME0 in the width direction D5 of the conveying path C1 of the recording medium ME0. The first guide 121 is immovable in the width direction D5. The second guide 122 is movable in the width direction D5. Here, the printing device 100 can print on a first recording medium ME1, which is the recording medium ME0, and a second recording medium ME2, which is wider than the first recording medium ME1 in the width direction D5. The first recording medium ME1 and the second recording medium ME2 are positioned in the width direction D5 using the first guide 121 as a reference. The foreign matter removal device 1 includes a cleaning roller 10 and a cleaning roller holder 40 that contact the recording medium ME0. The cleaning roller 10 includes a rotating shaft 20 having a first end 21 and a second end 22 opposite the first end 21; and an adhesive roller 30 having an adhesive surface 31 and attached to the rotating shaft 20. The cleaning roller holder 40 includes a first bearing 50 that limits the range of movement of the first end 21, and a second bearing 60 that limits the range of movement of the second end 22. The cleaning roller holder 40 removably positions the cleaning roller 10 with the first end portion 21 disposed in the first bearing portion 50 and the second end portion 22 disposed in the second bearing portion 60. The center of gravity CG1 of the cleaning roller 10 is located at a position overlapping the first recording medium ME1 in the width direction D5.

[0048] When the center of gravity CG1 of the cleaning roller 10 is located at the center CE1 in the longitudinal direction D1 of the cleaning roller 10, and the first recording medium ME1 having a narrow width is positioned in the width direction D5 with reference to the first guide 121, the cleaning roller 10 may tilt with the second end portion 22 side lowered. If the cleaning roller 10 tilts, the foreign matter removal performance may be reduced or abnormal noise may be generated.

[0049] If the center of gravity CG1 of the cleaning roller 10 is located so as to overlap the first recording medium ME1 in the width direction D5, even when the first recording medium ME1 having a relatively narrow width is positioned relative to the first guide 121 in the width direction D5, tilting of the cleaning roller 10 in contact with the first recording medium ME1 can be suppressed. Therefore, the eighth aspect can provide a printing apparatus that can suppress tilting of the cleaning roller even when a relatively narrow recording medium is positioned relative to a single guide in the width direction.

[0050] It should be noted that the above-mentioned methods 2 to 7 may also be added to the above-mentioned method 8.

[0051] In addition, the present technology can be applied to a foreign matter removal method corresponding to the above-mentioned foreign matter removal apparatus, a printing method corresponding to the above-mentioned printing apparatus, and the like.

[0052] (2) Specific example of a printing device equipped with a foreign matter removal device:

[0053] Figure 1 A printing apparatus 100 including the foreign matter removal apparatus 1 is schematically illustrated as an example. Figure 1 The printing apparatus 100 is shown in a state where a cover 141 on the upper portion of the conveyance path and a cover 142 on the side of the roll paper storage unit are opened. Figure 1 The upper portion of FIG. 1 shows a main portion around the foreign matter removal device 1 in the printing device 100 . Figure 2 The interior of the printing device 100 is schematically shown as an example. Figure 1 、 2 In the diagram, the X1 direction indicates the left direction, the X2 direction indicates the right direction opposite to the X1 direction, the Y1 direction indicates the forward direction perpendicular to the X1 and X2 directions, the Y2 direction indicates the backward direction opposite to the Y1 direction, the Z1 direction indicates the upward direction perpendicular to the X1, X2 directions and the Y1 and Y2 directions, and the Z2 direction indicates the downward direction opposite to the Z1 direction. Herein, the X1 and X2 directions are collectively referred to as the X direction, the Y1 and Y2 directions are collectively referred to as the Y direction, and the Z1 and Z2 directions are collectively referred to as the Z direction.

[0054] Figure 1 、 2 The printing device 100 shown includes a generally rectangular parallelepiped housing 140 that is long in the Y direction. An operation panel 143 is mounted on the left side of an upper portion of a front surface 140a of the housing 140, and a paper discharge port 144 is mounted on the right side. Figure 1 、 2 The printing device 100 shown is an inkjet printer that ejects ink droplets from a print head 130 onto a long recording medium ME0, and is a label printer that prints labels on the recording medium ME0. Ink as a color material is supplied to the print head 130 from an ink cartridge (not shown). Figure 1 、 2The recording medium ME0 shown is stored as roll paper in the roll paper storage section 117. The roll paper stored in the roll paper storage section 117 is held by the flange 115. Inside the housing 140, a head unit 131 including a print head 130 is located in the upper front portion, and a platen unit 135 is located in the lower front portion. The print head 130 has a nozzle face facing downward, and multiple nozzles arranged on this nozzle face eject ink droplets in the Z2 direction. The platen unit 135 has a horizontal platen face 135a that faces the nozzle face of the print head 130, separated by a predetermined platen gap.

[0055] The printing device 100 includes a conveying unit 110, a guide unit 120, a print head 130, a foreign matter removal device 1, and the like. The conveying unit 110 conveys the recording medium ME0 in the conveying direction D4. The guide unit 120 guides the recording medium ME0 being conveyed by the conveying unit 110. The print head 130 prints on the recording medium ME0. The foreign matter removal device 1 is positioned upstream of the print head 130 in the conveying direction D4, overlapping with the conveying path C1 when viewed from above, and removes foreign matter such as paper dust from the surface of the recording medium ME0. Here, "positioned upstream" means being positioned on the side opposite to the conveying direction D4 relative to the print head 130. The foreign matter removal device 1 can also be sold as an add-on unit and assembled into the printing device 100.

[0056] The conveyance path C1 originates from the roll paper accommodating section 117 and passes through the tension rod 116, the foreign matter removal device 1, the guide section 120, the paper feed roller pair 112, the platen surface 135a, and the paper discharge roller pair 113, ultimately reaching the paper discharge port 144. The conveyance section 110 includes a media feed motor 111, a paper feed roller pair 112, and a paper discharge roller pair 113. The media feed motor 111 rotates the roll paper accommodated in the roll paper accommodating section 117 in the unwinding direction. The tension rod 116 has a rotatable outer surface that contacts the recording medium ME0 and includes a spring that applies a force in the Y2 direction. This tension rod 116 applies tension to the recording medium ME0 positioned in the conveyance path C1. The guide section 120 defines the X-direction position of the recording medium ME0 as it passes from the tension rod 116 through the foreign matter removal device 1. The paper feed roller pair 112 conveys the recording medium ME0, which passes through the guide section 120, toward the platen surface 135a while holding it. The paper discharge roller pair 113 conveys the recording medium ME0 passing over the platen surface 135 a toward the paper discharge port 144 while sandwiching the recording medium ME0 .

[0057] Figure 2The head unit 131 shown is a collection of line inkjet heads, including a black print head 130K, a cyan print head 130C, a magenta print head 130M, and a yellow print head 130Y. The print heads 130K, 130C, 130M, and 130Y are collectively referred to as print heads 130. The print heads 130K, 130C, 130M, and 130Y are elongated in the X direction and arranged at regular intervals in the Y direction. On the nozzle surface of the print head 130, multiple nozzles that eject ink droplets are arranged in the X direction across the entire length of the recording medium ME0, including the maximum width. The print head 130 ejects ink droplets from the multiple nozzles onto the recording medium ME0 on the platen surface 135a. The ink droplets that land on the recording medium ME0 generate dots, printing an image formed by the multiple dots on the recording medium ME0.

[0058] Figure 3 The vicinity of the guide portion 120 of the printing apparatus 100 is schematically illustrated as an example.

[0059] The guide unit 120 includes a base 123 on which the recording medium ME0 is placed, a first guide 121 extending from the right edge of the base 123 in the Z1 direction, and a second guide 122 located opposite the first guide 121 in the X2 direction. The base 123 is fixed inside the housing 140. The first guide 121 is immovable in the width direction D5 of the conveyance path C1 of the recording medium ME0 and guides one edge ME0a of the recording medium ME0. The second guide 122 is movable in the width direction D5 and includes a sliding mechanism 124 that allows the second guide 122 to slide relative to the base 123 in the X direction, and a lock release lever 125 for releasing the sliding lock of the second guide 122. The width direction D5 is the X direction. When the user pushes the lock release lever 125 in the direction indicated by the arrow, the sliding lock of the second guide 122 is released, allowing the second guide 122 to be manually slid in the X direction. If the user releases his hand from the lock release lever 125, the lock release lever 125 locks the sliding of the second guide 122. In this state, the second guide 122 guides the other edge ME0b of the recording medium ME0. Figure 9 When the second recording medium ME2 having a wider width W2 is used as the recording medium ME0 as shown in the example, the user can simply move the second guide 122 to the right so that the interval between the guides 121 and 122 matches the width W2. Figure 10 When the first recording medium ME1 having a narrow width W1 is used as the recording medium ME0 as illustrated, the user may move the second guide 122 to the left so that the interval between the guides 121 and 122 matches the width W1 .

[0060] Based on the above, the first recording medium ME1 and the second recording medium ME2 are positioned in the width direction D5 with reference to the first guide 121 .

[0061] When the recording medium ME0 is the wider second recording medium ME2, the printing apparatus 100 performs printing on the second recording medium ME2 by ejecting ink droplets from the print head 130 in accordance with the width W2 of the second recording medium ME2 with the first guide 121 as a reference. When the recording medium ME0 is the narrower first recording medium ME1, the printing apparatus 100 performs printing on the first recording medium ME1 by ejecting ink droplets from the print head 130 in accordance with the width W1 of the first recording medium ME1 with the first guide 121 as a reference.

[0062] like Figure 1 、 3 As shown, the foreign matter removal device 1, which is arranged between the tension rod 116 and the guide portion 120 on the conveying path C1, includes a cleaning roller 10 and a cleaning roller holder 40 that are in contact with the recording medium ME0. The longitudinal direction D1 of the cleaning roller 10 is the X direction. The rotation axis of the cleaning roller 10 includes a first end portion 21 that protrudes in the X1 direction and a second end portion 22 that protrudes in the X2 direction. The cleaning roller holder 40 includes a first bearing portion 50 that supports the first end portion 21 and a second bearing portion 60 that supports the second end portion 22, and positions the cleaning roller 10 in a removable manner. The cleaning roller 10 positioned in the cleaning roller holder 40 is held rotatable relative to the bearing portions 50 and 60 by its own weight, and removes foreign matter from the surface of the recording medium ME0 by contacting the surface of the recording medium ME0.

[0063] Figure 4 1 is an exploded view schematically illustrating the foreign matter removal device 1 . Figure 4 1 shows a longitudinal section of the adhesive roller 30 of the cleaning roller 10. Figure 4 In the cleaning roller holder 40 shown in FIG. 1 , the position of the cleaning roller 10 when there is no recording medium ME0 is indicated by a two-dot chain line. Figure 5 1 is a perspective view schematically illustrating the cleaning roller holder 40 . Figure 6 FIG. 4 is a top view schematically illustrating the cleaning roller holder 40. Figure 6 The position of the cleaning roller 10 when there is no recording medium ME0 is shown by a two-dot chain line on the cleaning roller holder 40. The vertical end face of the foreign matter removal device 1 when cut at the position A1-A1 is shown in a two-dot chain line frame. Figure 7 The main part of the left side of the foreign matter removal device 1 is schematically illustrated, and the gap CL1 between the first bearing portion 50 of the cleaning roller holder 40 and the first end portion 21 of the cleaning roller 10 is schematically illustrated. Figure 8The main part of the right side of the foreign matter removal device 1 is schematically illustrated, and the gap CL2 between the second bearing portion 60 of the cleaning roller holder 40 and the second end portion 22 of the cleaning roller 10 is schematically illustrated. Figure 9 A case where the second recording medium ME2 having a relatively wide width W2 is passed through the foreign matter removing apparatus 1 is schematically illustrated as an example. Figure 10 A case where the first recording medium ME1 having a narrow width W1 is passed through the foreign matter removing apparatus 1 is schematically illustrated as an example.

[0064] The foreign matter removal device 1 includes a cleaning roller 10 and a cleaning roller holder 40 that are in contact with the recording medium ME0. Figure 1 、 4 As shown, the cleaning roller 10 can be installed on the cleaning roller holder 40 from above the cleaning roller holder 40 , and the cleaning roller 10 can be removed upward from the cleaning roller holder 40 .

[0065] The cleaning roller 10 includes a rotating shaft 20 and an adhesive roller 30. The adhesive roller 30 is cylindrical with a thickness change midway and has a through-hole extending through the rotating shaft 20 along the centerline AX1 of the cleaning roller 10. The rotating shaft 20, which extends through the adhesive roller 30, has a first end 21 protruding from a larger diameter portion 25 of the rotating shaft 20 in the X1 direction and a second end 22 protruding from the adhesive roller 30 in the X2 direction. The rotating shaft 20 can be made of metals such as brass with a specific gravity of 8-9 or stainless steel with a specific gravity of 7-8. The adhesive roller 30 has an adhesive surface 31 and is attached to the outer surface of the rotating shaft 20. The adhesive roller 30 can be made of a rubber material such as EPDM (Ethylene-Propylene-Diene Methylene linkage) rubber with a specific gravity of less than 1 or silicone rubber with a specific gravity of less than 1. The specific gravity of the rotating shaft 20 is greater than that of the adhesive roller 30.

[0066] The cleaning roller holder 40 includes a first bearing portion 50 , a second bearing portion 60 , and a bottom portion 80 connecting a lower portion 50 b of the first bearing portion 50 and a lower portion 60 b of the second bearing portion 60 .

[0067] like Figure 7As shown, the first bearing 50 includes restricting portions 71, 73, and 74 that restrict movement of the first end portion 21 when the first end portion 21 contacts the bearing. The first restricting portion 71 restricts movement of the first end portion 21 in the Z2 direction when the first end portion 21 contacts the bearing. The third restricting portion 73 restricts movement of the first end portion 21 in the Y1 direction, which serves as the conveying direction D4, when the first end portion 21 contacts the bearing. The fourth restricting portion 74 restricts movement of the first end portion 21 in the Y2 direction when the first end portion 21 contacts the bearing. Here, the Y direction is an example of an intersecting direction D3 that intersects the gravity direction D2, which serves as the Z2 direction, and the longitudinal direction D1 of the cleaning roller 10. When the cleaning roller 10 is not tilted, a gap exists between the first restricting portion 71 and the first end portion 21. The distance L3 between the third restricting portion 73 and the fourth restricting portion 74 is greater than the diameter R3 of the first end portion 21. Therefore, the first bearing 50 restricts the range of movement of the first end portion 21. The upper portion of the first bearing 50 is open to allow the first end portion 21 to pass through.

[0068] like Figure 8 As shown, the second bearing portion 60 has limiting portions 72, 75, and 76 that limit the movement of the second end portion 22 when the second end portion 22 is in contact. The second limiting portion 72 limits the movement of the second end portion 22 in the Z2 direction when the second end portion 22 is in contact. The fifth limiting portion 75 limits the movement of the second end portion 22 in the Y1 direction when the second end portion 22 is in contact. The sixth limiting portion 76 limits the movement of the second end portion 22 in the Y2 direction when the second end portion 22 is in contact. When the cleaning roller 10 is not tilted, there is a gap between the second limiting portion 72 and the second end portion 22. The distance L4 between the fifth limiting portion 75 and the sixth limiting portion 76 is greater than the diameter R4 of the second end portion 22. Therefore, the second bearing portion 60 limits the movement range of the configured second end portion 22. The upper portion of the second bearing portion 60 is open in a manner that allows the second end portion 22 to pass through.

[0069] As described above, the cleaning roller holder 40 removably positions the cleaning roller 10, with the first end portion 21 positioned in the first bearing portion 50 and the second end portion 22 positioned in the second bearing portion 60. The cleaning roller 10, positioned in the cleaning roller holder 40, contacts the surface of the recording medium ME0 due to its own weight and rotates about the rotation axis 20 as the recording medium ME0 is conveyed. The surface 31 of the adhesive roller 30, which contacts the surface of the recording medium ME0, is adhesive, so the cleaning roller 10 removes foreign matter present on the surface of the recording medium ME0 by causing it to adhere to the adhesive roller 30.

[0070] The material of the cleaning roller holder 40 is not particularly limited, and synthetic resin, metal, or the like can be used.

[0071] by Figures 1 to 3 The first guide member 121 of the guide portion 120 is used as a reference for positioning an edge portion ME0a of the recording medium ME0. Figure 9 、 10 The figure is consistent with the one end portion 30a of the adhesive roller 30. There is no recording medium ME0 between the other edge portion ME0b of the recording medium ME0 and the other end portion 30b of the adhesive roller 30. Figure 10 As shown, the recording medium ME0 includes a first recording medium ME1 having a width W1 from one edge portion ME0a of the adhesive roller 30 to the center CE1 of the cleaning roller 10 in the longitudinal direction D1. The center CE1 of the cleaning roller 10 is as shown in FIG. Figure 4 The figure shows the middle position relative to the full length L0 of the cleaning roller 10. Figure 9 The width W2 of the second recording medium ME2 is set to 112 mm. Figure 10 The width W1 of the first recording medium ME1 shown is set to 50 mm. The printing device 100 can print on recording media ME0 with widths ranging from W1 to W2. In this case, the width W1 of the first recording medium ME1 is approximately 45% of the width W2 of the second recording medium ME2, which is less than half of width W2. This specific example is characterized by the center of gravity CG1 of the cleaning roller 10 being located so as to overlap with the first recording medium ME1 in the width direction D5 of the conveyance path C1.

[0072] Figure 13 The foreign matter removal device 901 according to the comparative example is schematically shown in which the center of gravity CG1 of the cleaning roller 910 is located at the center CE1 in the longitudinal direction D1 of the cleaning roller 910. Figure 10 The elements included in the foreign body removal device 1 shown are substantially the same as those in the foreign body removal device 1 shown in FIG. Figure 10 The reference numerals are shown and detailed description is omitted.

[0073] The cleaning roller 910 includes a rotating shaft 920 having a constant diameter from the first end 21 to the second end 22, and an adhesive roller 930 having an adhesive property on its surface 31 and attached to the rotating shaft 920. The cleaning roller holder 940 includes a first bearing 950 that removably receives the first end 21, a second bearing 960 that removably receives the second end 22, and a bottom portion 80 that connects the lower portion 50b of the first bearing 950 to the lower portion 60b of the second bearing 960.

[0074] The center of gravity CG1 of the cleaning roller 910 positioned on the cleaning roller holder 940 is located at the center CE1 in the longitudinal direction D1 of the cleaning roller 910 and is offset from the first recording medium ME1 having a narrow width W1. Figure 13 As shown, the cleaning roller 910 may tilt with its second end 22 lowered, causing the edge 30b of the adhesive roller 930 to contact the upper surface of the base 80, thereby generating unusual noise or vibration. If this vibration is transmitted to the head unit or platen unit, printing quality may be reduced. In particular, when the first recording medium ME1 is unwound from a roll of paper, the curled shape of the first recording medium ME1 derived from the roll shape easily causes the cleaning roller 910 to wobble, and the cleaning roller 910 is easily tilted with its second end 22 lowered. When fanfold paper is used instead of roll paper, the convex and concave folds derived from the folds of the fanfold paper easily cause the cleaning roller 910 to wobble, and the cleaning roller 910 is easily tilted with its second end 22 lowered.

[0075] It should be noted that although it is conceivable to prepare cleaning rollers for each width of the recording medium ME0, there may be disadvantages such as the trouble of selecting cleaning rollers for each width of the recording medium ME0, the cost increase caused by the increase in cleaning rollers, and the increase in packaging size.

[0076] In this specific example, if Figure 10 As shown, the area where the first recording medium ME1 of width W1 is present in the width direction D5 of the conveyance path C1 is defined as the center of gravity arrangement area AR1, and the center of gravity CG1 of the cleaning roller 10 is set at a position overlapping with the first recording medium ME1 in the width direction D5. This prevents the cleaning roller 10 from tilting while in contact with the first recording medium ME1 of narrow width W1.

[0077] exist Figure 4In the illustrated cleaning roller 10, the rotating shaft 20 has a diameter R3 at the first end 21 and a diameter R4 at the second end 22 that are equal. The rotating shaft 20, having ends 21 and 22, includes a first region 23 having a first diameter R1 that is larger than the diameters R3 and R4 of the ends 21 and 22, and a second region 24 having a second diameter R2 that is equal to the diameters R3 and R4 of the ends 21 and 22 and located closer to the second end 22 than the first region 23. The second diameter R2 of the second region 24 is smaller than the first diameter R1 of the first region 23. Meanwhile, the diameter of the adhesive roller 30 at the location overlapping with the first region 23 and the diameter of the adhesive roller 30 at the location overlapping with the second region 24 are equal, namely, diameter R0. Furthermore, because the rotating shaft 20 has a higher specific gravity than the adhesive roller 30, the center of gravity CG1 of the cleaning roller 10 is offset from the center CE1 of the cleaning roller 10 in the longitudinal direction D1 of the cleaning roller 10, toward the first end 21, within the range of the adhesive roller 30 in the longitudinal direction D1 of the cleaning roller 10. As a result, the center of gravity CG1 of the cleaning roller 10 enters the center of gravity arrangement area AR1 overlapping the first recording medium ME1 in the width direction D5 of the conveyance path C1. The rotating shaft 20 includes a first region 23 having a first diameter R1 and a second diameter R2 that is thinner than the first diameter R1. The diameter R0 of the adhesion roller 30 is equal at the position overlapping the first region 23 and the position overlapping the second region 24. Therefore, the center of gravity CG1 of the cleaning roller 10 can be positioned closer to the first end 21 than the center CE1 of the cleaning roller 10 in the longitudinal direction D1. This allows the diameter of the cleaning roller 10 to be uniform, thereby achieving excellent foreign matter removal performance.

[0078] Figure 4 The rotating shaft 20 shown in FIG. 1 includes a larger diameter portion 25 larger than the first diameter R1 between one end 30a of the adhesion roller 30 and the first end 21 having a diameter R3.

[0079] Here, the length of the adhesive roller 30 from one end 30a to the other end 30b is defined as L1, and the length from one end 30a of the adhesive roller 30 to the center of gravity CG1 of the cleaning roller 10 is defined as L2. Preferably, the ratio L2 / L1 of the length L2 to the length L1 is greater than 0 and equal to or less than 0.45. To increase the ratio L2 / L1, for example, the first region 23 can be shortened in the longitudinal direction D1 of the cleaning roller 10. To decrease the ratio L2 / L1, for example, the first region 23 can be lengthened in the longitudinal direction D1 of the cleaning roller 10.

[0080] Figures 4 to 7The first bearing portion 50 of the cleaning roller holder 40 shown in the figure includes, in order along the X1 direction, an inner piece 51 extending from the lower portion 50b in the Z1 direction, a middle piece 52 extending from the lower portion 50b in the Z1 direction, and an outer piece 53 extending from the lower portion 50b in the Z1 direction. A gap exists between the inner piece 51 and the middle piece 52, and a gap exists between the middle piece 52 and the outer piece 53. The inner piece 51 and the outer piece 53 each include a first restricting portion 71 that restricts movement of the first end portion 21 in the gravity direction D2. The inner piece 51 includes a third restricting portion 73 that restricts movement of the first end portion 21 in the Y1 direction. The middle piece 52 includes a fourth restricting portion 74 that restricts movement of the first end portion 21 in the Y2 direction. The distance L3 between the restricting portions 73 and 74 is greater than the diameter R3 of the first end portion 21.

[0081] Figures 4-6 The second bearing portion 60 of the cleaning roller holder 40 shown in FIG. 8 includes, in order along the X2 direction, an inner piece 61 extending from the lower portion 60b in the Z1 direction, an intermediate piece 62 extending from the lower portion 60b in the Z1 direction, and an outer piece 63 extending from the lower portion 60b in the Z1 direction. A gap exists between the inner piece 61 and the intermediate piece 62, and a gap exists between the intermediate piece 62 and the outer piece 63. The inner piece 61 includes a second restricting portion 72 that restricts movement of the second end portion 22 in the gravity direction D2, and a fifth restricting portion 75 that restricts movement of the second end portion 22 in the Y1 direction. The intermediate piece 62 includes a sixth restricting portion 76 that restricts movement of the second end portion 22 in the Y2 direction. The distance L4 between the restricting portions 75 and 76 is greater than the diameter R4 of the second end portion 22.

[0082] like Figure 4 As shown in FIG. 1 , the upper end 72a of the second limiting portion 72 is located higher than the upper end 71a of the first limiting portion 71 in the gravity direction D2. Figure 10 As shown, sometimes even if the center of gravity CG1 of the cleaning roller 10 is in the center of gravity arrangement area AR1, the cleaning roller 10 may be shaken due to the curled shape of the first recording medium ME1. In this case, even if the cleaning roller 10 is inclined in the direction of lowering the second end portion 22, as shown in FIG. Figure 11 As shown in the example, the second end portion 22 also contacts the upper end 72a of the second restricting portion 72, which is higher than the first restricting portion 71. This prevents the cleaning roller 10 from tilting downward toward the second end portion 22, and prevents the end 30b of the adhesive roller 30 from contacting the upper surface 81 of the bottom portion 80, thereby suppressing abnormal noise and vibration.

[0083] like Figure 5 、 6As shown, in the first bearing 50, the third limiting portion 73, which limits movement of the first end portion 21 in the Y1 direction, and the fourth limiting portion 74, which limits movement of the first end portion 21 in the Y2 direction, are located at different positions in the width direction D5 of the conveyance path C1. This prevents deviation between the longitudinal direction D1 and the width direction D5 of the cleaning roller 10, thereby suppressing skew caused by the recording medium ME0 shifting diagonally. Furthermore, in the second bearing 60, the fifth limiting portion 75, which limits movement of the second end portion 22 in the Y1 direction, and the sixth limiting portion 76, which limits movement of the second end portion 22 in the Y2 direction, are located at different positions in the width direction D5. This prevents deviation between the longitudinal direction D1 and the width direction D5 of the cleaning roller 10, thereby suppressing the aforementioned skew. Furthermore, the restricting portions 74 and 76 that restrict the movement of the end portions 21 and 22 in the Y2 direction are positioned outward in the width direction D5 relative to the restricting portions 73 and 75 that restrict the movement of the end portions 21 and 22 in the Y1 direction. Therefore, the aforementioned skew can be effectively suppressed. Although not shown, the aforementioned skew can also be effectively suppressed even if the restricting portions 73 and 75 that restrict the movement of the end portions 21 and 22 in the Y1 direction are positioned outward in the width direction D5 relative to the restricting portions 74 and 76 that restrict the movement of the end portions 21 and 22 in the Y2 direction.

[0084] like Figure 4 As shown in the cleaning roller holder 40, it is assumed that the first end portion 21 is arranged on the first bearing portion 50, the second end portion 22 is arranged on the second bearing portion 60, and the cleaning roller 10 is placed on the bottom portion 80. In this state, Figure 7 As shown, there is a gap CL1 between the first end portion 21 and the first limiting portion 71 in the gravity direction D2. Figure 8 As shown, a gap CL2 exists between the second end portion 22 and the second restricting portion 72 in the direction of gravity D2. This allows the cleaning roller 10 to fully contact the recording medium ME0 and effectively remove foreign matter from the surface of the recording medium ME0. It should be noted that the upper end 72a of the second restricting portion 72 is higher than the upper end 71a of the first restricting portion 71. Therefore, the gap CL2 between the second end portion 22 and the second restricting portion 72 is smaller than the gap CL1 between the first end portion 21 and the first restricting portion 71.

[0085] Assuming that the foreign body removal device 1 is mass-produced, even if Figure 11 The design shown is such that the end portion 30b of the adhesive roller 30 does not contact the upper surface 81 of the bottom portion 80, but the foreign matter removing device 1 may also have deviations. Therefore, in order to prevent the cleaning roller 10 from contacting the bottom portion 80 when the cleaning roller 10 is tilted with the second end portion 22 side lowered, as shown in FIG. Figure 5 、 6As shown, the upper surface 81 of the bottom portion 80 has a recess 82. The recess 82 is located in a portion P2 closer to the second end portion 22 than the center CE1 in the longitudinal direction D1, of the portion P1 overlapping the cleaning roller 10 when viewed from above, and the center line AX1 of the rotating shaft 20 overlaps with the recess 82. Figure 11 As shown, when the cleaning roller 10 is tilted so that the second end portion 22 side is lowered, it is difficult for the cleaning roller 10 to come into contact with the bottom portion 80 , and abnormal noise and vibration can be effectively suppressed.

[0086] (3) Functions and effects of the foreign matter removal device according to the specific example:

[0087] like Figure 9 As shown, when the recording medium ME0 is the second recording medium ME2 having a relatively wide width W2, the second recording medium ME2 exists across almost the entire adhesive roller 30 in the longitudinal direction D1 of the cleaning roller 10. Therefore, the likelihood of the adhesive roller 30 contacting the bottom 80 of the cleaning roller holder 40 due to the tilt of the cleaning roller 10 is low. The cleaning roller 10, having contacted the surface of the second recording medium ME2, rotates about the rotation axis 20 as the second recording medium ME2 is conveyed, and foreign matter on the surface of the second recording medium ME2 is removed by adhering to the adhesive roller 30.

[0088] like Figure 10 As shown, when the recording medium ME0 is a first recording medium ME1 having a relatively narrow width W1, the first recording medium ME1 is absent from the wide range from the edge ME0b of the recording medium ME0 to the end 30b of the adhesion roller 30. The center of gravity CG1 of the cleaning roller 10 is offset from the center CE1 in the longitudinal direction D1 of the cleaning roller 10 toward the first end 21 and is positioned so as to overlap with the first recording medium ME1 in the width direction D5 of the conveyance path C1. Therefore, even if the first recording medium ME1 having a relatively narrow width W1 is positioned relative to the first guide 121 in the width direction D5 and deviates toward the first end 21 of the cleaning roller 10, the tendency of the cleaning roller 10 to tilt downward toward the second end 22 is suppressed. The cleaning roller 10, in contact with the surface of the first recording medium ME1, rotates about the rotation axis 20 as the first recording medium ME1 is conveyed, removing foreign matter from the surface of the first recording medium ME1 by causing it to adhere to the adhesion roller 30.

[0089] As described above, the printing device 100 can suppress tilting of the cleaning roller even when a narrow recording medium is positioned relative to one guide in the width direction. The foreign matter removal device 1 can suppress tilting of the cleaning roller even when the center of the medium deviates from the first end of the cleaning roller's rotational axis in the longitudinal direction of the cleaning roller. Consequently, abnormal noise and vibration caused by contact between the adhesive roller 30 and the bottom portion 80 of the cleaning roller holder 40 can be suppressed.

[0090] (4) Modification:

[0091] Various modifications are conceivable for the present invention.

[0092] For example, the printing device is not limited to a line inkjet printer. The printing device may also be a serial inkjet printer that ejects ink droplets from the print head while moving it in the width direction of the conveyance path, or an electrophotographic printer such as a laser printer that uses toner as a color material.

[0093] The types of color materials used to form an image on a recording medium are not limited to a combination of black, cyan, magenta, and yellow. Color materials may also include light black with a lower density than black, light cyan with a lower density than cyan, light magenta with a lower density than magenta, dark yellow with a higher density than yellow, orange, green, and non-colored color materials for improving image quality. Furthermore, the present technology is also applicable even when some of the color materials among black, cyan, magenta, and yellow are not used.

[0094] like Figure 12 As illustrated, the center of gravity CG1 of the cleaning roller 10 may be shifted from the center CE1 toward the first end portion 21 by attaching the weight 29 to the rotating shaft 20 . Figure 12 The foreign matter removal device 1 is schematically shown as an example, which includes a weight 29 mounted on the rotating shaft 20. Figure 12 Among the multiple elements shown Figure 4 Elements that are substantially the same as the elements shown are marked Figure 4 The reference numerals are shown and detailed description is omitted. Figure 12 The rotating shaft 20 shown has a certain diameter R3 = R4. The weight 29 is mounted on the rotating shaft 20 at a position closer to the first end 21 than the end 30a of the adhesion roller 30.

[0095] The weight 29 can be made of a material having a larger specific gravity than the adhesion roller 30 , such as metal such as brass or stainless steel.

[0096] As described above, the center of gravity CG1 of the cleaning roller 10 can be shifted toward the first end portion 21 relative to the center CE1, and can be positioned so as to overlap the first recording medium ME1 in the width direction D5 of the transport path C1. Figure 12The foreign matter removal device 1 shown can suppress the inclination of the cleaning roller even if the center of the medium deviates toward the first end portion of the rotation shaft of the cleaning roller in the longitudinal direction of the cleaning roller.

[0097] It should be noted that the basic effect of suppressing the inclination of the cleaning roller can also be achieved when the bottom 80 of the cleaning roller holder 40 has no recess 82 and the upper end 72a of the second limiting portion 72 is not higher than the upper end 71a of the first limiting portion 71.

[0098] (5) Summary:

[0099] As described above, the present invention can provide, through various methods, a foreign matter removal device or other technology that can suppress the tilt of the cleaning roller even when the center of the medium deviates from the first end of the rotation axis of the cleaning roller in the longitudinal direction of the cleaning roller. Of course, the above-mentioned basic functions and effects can also be achieved by a technology consisting only of the constituent elements involved in the independent claims.

[0100] Furthermore, it is also possible to implement a structure obtained by replacing or modifying the structures disclosed in the above examples, a structure obtained by replacing or modifying the structures disclosed in the above examples and known technologies, etc. The present invention also includes these structures.

Claims

1. A foreign body removal device, characterized in that: A cleaning roller and a cleaning roller holder are provided, wherein the cleaning roller contacts the medium from above the medium. The cleaning roller comprises: a rotating shaft having a first end and a second end, the second end being located on a side opposite to the first end; and an adhesive roller having adhesive properties on its surface and mounted on the rotating shaft, The cleaning roller holder comprises: a first bearing portion, which limits the movement range of the first end portion; and The second bearing portion limits the movement range of the second end portion. The cleaning roller holder positions the cleaning roller in a detachable manner in a state where the first end portion is disposed on the first bearing portion and the second end portion is disposed on the second bearing portion. The center of gravity of the cleaning roller is offset from the center in the longitudinal direction of the cleaning roller toward the first end portion and is within a range where the adhesion roller exists in the longitudinal direction.

2. The foreign matter removal device according to claim 1, wherein: The rotating shaft has: a first region having a first diameter; and a second region having a second diameter thinner than the first diameter, the second region being closer to the second end than the first region, The diameter of the adhesion roller at a position overlapping with the first region is equal to the diameter of the adhesion roller at a position overlapping with the second region.

3. The foreign matter removal device according to claim 1, wherein The cleaning roller includes a weight, and the weight is attached to the rotating shaft at a position closer to the first end portion than the adhesion roller.

4. The foreign matter removal device according to any one of claims 1 to 3, characterized in that: The first bearing portion includes a first limiting portion, and the first limiting portion limits movement of the first end portion in the direction of gravity. The second bearing portion includes a second limiting portion, and the second limiting portion limits movement of the second end portion in the direction of gravity. In the gravity direction, the upper end of the second restricting portion is located higher than the upper end of the first restricting portion.

5. The foreign matter removal device according to claim 4, characterized in that The cleaning roller holder includes a bottom portion connecting the lower portion of the first bearing portion and the lower portion of the second bearing portion. When the first end portion is arranged on the first bearing portion, the second end portion is arranged on the second bearing portion, and the cleaning roller is placed on the bottom portion, a gap exists between the second end portion and the second restriction portion in the direction of gravity.

6. The foreign matter removal device according to claim 5, characterized in that The bottom portion has an upper surface having a depression in a portion of the upper surface that overlaps with the cleaning roller and is closer to the second end portion than the center in the longitudinal direction in a plan view, and a center line of the rotation shaft overlaps with the depression.

7. The foreign matter removal device according to claim 1, wherein: The first bearing portion includes a third limiting portion and a fourth limiting portion, wherein the third limiting portion limits movement toward one side in a direction intersecting the direction of gravity and the longitudinal direction of the cleaning roller, and the fourth limiting portion limits movement toward the other side in the intersecting direction. The second bearing portion includes a fifth limiting portion and a sixth limiting portion, wherein the fifth limiting portion limits movement toward the one side in the intersecting direction, and the sixth limiting portion limits movement toward the other side in the intersecting direction. The distance between the third limiting portion and the fourth limiting portion is greater than the diameter of the first end portion, A distance between the fifth limiting portion and the sixth limiting portion is greater than a diameter of the second end portion.

8. A printing device, characterized in that: have: a conveying portion for conveying the recording medium in a conveying direction; a guide portion for guiding the transport portion to transport the recording medium; a printing head for printing on the recording medium; as well as A foreign matter removal device is arranged upstream of the printing head in the conveying direction. The guide portion includes a first guide and a second guide, wherein the first guide guides one edge of the recording medium in a width direction of a conveyance path of the recording medium, and the second guide guides the other edge of the recording medium in the width direction. The first guide member cannot move in the width direction, The second guide member is movable in the width direction. The printing device can print on a first recording medium and a second recording medium as the recording medium, wherein the second recording medium is wider in the width direction than the first recording medium. The first recording medium and the second recording medium are positioned in the width direction with reference to the first guide. The foreign matter removal device includes a cleaning roller and a cleaning roller holder, wherein the cleaning roller contacts the recording medium. The cleaning roller comprises: a rotating shaft having a first end and a second end, the second end being located on a side opposite to the first end; and an adhesive roller having adhesive properties on its surface and mounted on the rotating shaft, The cleaning roller holder comprises: a first bearing portion, which limits the movement range of the first end portion; and The second bearing portion limits the movement range of the second end portion. The cleaning roller holder positions the cleaning roller in a detachable manner in a state where the first end portion is disposed on the first bearing portion and the second end portion is disposed on the second bearing portion. The center of gravity of the cleaning roller is located at a position overlapping with the first recording medium in the width direction.

9. The printing device according to claim 8, characterized in that The rotating shaft has: a first region having a first diameter; and a second region having a second diameter thinner than the first diameter, the second region being closer to the second end than the first region, The diameter of the adhesion roller at a position overlapping with the first region is equal to the diameter of the adhesion roller at a position overlapping with the second region.

10. The printing device according to claim 8, wherein The cleaning roller includes a weight, and the weight is attached to the rotating shaft at a position closer to the first end portion than the adhesion roller.

11. The printing device according to any one of claims 8 to 10, characterized in that The first bearing portion includes a first limiting portion, and the first limiting portion limits movement of the first end portion in the direction of gravity. The second bearing portion includes a second limiting portion, and the second limiting portion limits movement of the second end portion in the direction of gravity. In the gravity direction, the upper end of the second restricting portion is located higher than the upper end of the first restricting portion.

12. The printing device according to claim 11, wherein The cleaning roller holder includes a bottom portion connecting the lower portion of the first bearing portion and the lower portion of the second bearing portion. When the first end portion is arranged on the first bearing portion, the second end portion is arranged on the second bearing portion, and the cleaning roller is placed on the bottom portion, a gap exists between the second end portion and the second restriction portion in the direction of gravity.

13. The printing device according to claim 12, wherein: The bottom portion has an upper surface having a depression in a portion of the upper surface overlapping the cleaning roller closer to the second end portion than the center in the longitudinal direction of the cleaning roller in a plan view, and a center line of the rotation shaft overlaps with the depression.

14. The printing device according to claim 8, wherein The first bearing portion includes a third limiting portion and a fourth limiting portion, wherein the third limiting portion limits movement toward one side in a direction intersecting the gravity direction and the width direction, and the fourth limiting portion limits movement toward the other side in the intersecting direction. The second bearing portion includes a fifth limiting portion and a sixth limiting portion, wherein the fifth limiting portion limits movement toward the one side in the intersecting direction, and the sixth limiting portion limits movement toward the other side in the intersecting direction. The distance between the third limiting portion and the fourth limiting portion is greater than the diameter of the first end portion, A distance between the fifth limiting portion and the sixth limiting portion is greater than a diameter of the second end portion.

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