printer

Abstract

The present invention provides a printer. The number of parts required when assembling a tension rod and a support arm can be reduced, and the operation time for assembling the tension rod and the support arm can be shortened. The printer (10) comprises a platen (12) for supporting a medium (5) during printing, a winding shaft (41) for winding the printed medium (5), and a tension rod unit (50) for applying tension to a portion of the medium (5) from the platen (12) toward the winding shaft (41). The tension rod unit (50) comprises a cylindrical tension rod (51), and a pair of support arms (52) provided at both ends of the tension rod (51) and supporting the tension rod (51) in a swingable manner. The support arm (52) comprises an arm body (60) for supporting the tension rod (51) in a swingable manner, and a fixing portion (70) formed integrally with the arm body (60). The fixing portion (70) is embedded in the inner circumferential surface of the tension rod (51) and fixed to the tension rod (51).

Description

Technical Field

[0001] The present invention relates to printers. Background Art

[0002] For example, Patent Document 1 discloses a printer that winds a medium into a roll after printing. The printer includes a printer body, a medium support portion that is provided on the printer body and supports the medium during printing, a winding portion that winds up the printed medium, and a tension rod that applies tension to a portion of the medium from the medium support portion toward the winding portion. The tension rod is supported by one end of a support arm, and the other end of the support arm is supported by the printer body in a swingable manner. In the printer, the tension rod swings downward by its own weight, thereby applying tension to the medium.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2018 / 139263 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, the tensioning rod and the supporting arm are different components that are assembled to each other. Fig.17 2 is a cross-sectional view schematically showing a state where the tension rod 151 and the left support arm 152 of the conventional printer 210 are assembled. Fig.17 As shown, a cylindrical tension rod 151 is assembled to a support arm 152 via an intermediate member 153 made of aluminum, for example.

[0008] When assembling the tension rod 151 to the support arm 152, first, the intermediate component 153 is inserted into the tension rod 151, and a sealant is applied between the inner peripheral surface of the tension rod 151 and the intermediate component 153. Next, after the sealant is left for a predetermined time (e.g., 24 hours) until it solidifies, two screws 191 are tightened from the upper and lower sides of the tension rod 151 to fix the tension rod 151 and the intermediate component 153. Thereafter, the intermediate component 153 and the support arm 152 are overlapped, and the support arm 152 is fixed to the intermediate component 153 by tightening them with the two screws 192. Thus, the tension rod 151 and the support arm 152 are fixed via the intermediate component 153.

[0009] Thus, in the past, when assembling the tension rod 151 and the support arm 152, the intermediate member 153 was required, and the number of components increased. Furthermore, in the past, since a sealant was used, time was required until the sealant solidified, and the operation time of assembling the tension rod 151 and the support arm 152 was required.

[0010] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a printer capable of reducing the number of parts required when assembling a tension rod and a support arm and shortening the work time for assembling the tension rod and the support arm.

[0011] Technical solutions to solve problems

[0012] The printer of the present invention comprises: a support platform for supporting the medium during printing; a winding shaft for winding the medium after printing; and a tension rod unit for applying tension to the portion of the medium from the support platform toward the winding shaft, the tension rod unit comprising: a cylindrical tension rod; and a pair of support arms, which are arranged at both ends of the tension rod and support the tension rod in a swingable manner, the support arm comprising: an arm body, which supports the tension rod in a swingable manner; and a fixing portion, which is formed integrally with the arm body, and the fixing portion is embedded in the inner circumferential surface of the tension rod and fixed to the tension rod.

[0013] According to the printer of the present invention, the support arm and the tension rod can be fixed by fitting the fixing portion of the support arm into the cylindrical tension rod. Therefore, the conventional intermediate member 153 (see Fig.17 ) and without using a sealant, the support arm and the tension rod can be fixed. Therefore, the number of components of the tension rod unit can be reduced, and the operation time for assembling the tension rod and the support arm can be shortened.

[0014] Effects of the Invention

[0015] According to the present invention, it is possible to provide a printer that can reduce the number of parts required when assembling a tension rod and a support arm and can shorten the work time for assembling the tension rod and the support arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view showing the printer according to the first embodiment.

[0017] Figure 2 It is a right side view showing the printer according to the first embodiment.

[0018] Figure 3 It is a perspective view showing the tension rod unit.

[0019] Figure 4 It is a bottom view showing the tension rod and the right support rod of the tension rod unit.

[0020] Figure 5 It means along Figure 4 Cross-sectional view of the tension rod unit in section VV.

[0021] Figure 6 It is a perspective view showing a support arm.

[0022] Figure 7 This is a view of the support arm as viewed from the side opposite to the tension rod.

[0023] Figure 8 It is a top view showing the support arm.

[0024] Fig. 9 It is a bottom view showing the support arm.

[0025] Fig.10 It is a front view showing the support arm.

[0026] Fig.11 It is a perspective view showing a tension rod unit according to a second embodiment.

[0027] Fig.12 It is a diagram showing the tension rod unit when viewed from the axial direction of the tension rod.

[0028] Fig.13 It is a three-dimensional diagram showing the counterweight.

[0029] Fig.14 Yes Fig.13 A magnified view of part A.

[0030] Fig.15 (a) is a diagram showing the first groove of the counterweight, which is a bottom view of the counterweight. Fig.15 (b) is a diagram showing the second groove of the counterweight, which is a front view of the counterweight. Fig.15 (c) is a diagram showing the counterweight when viewed from the axial direction of the tension rod.

[0031] Fig.16 It is a perspective view showing a tension rod and a counterweight of a tension rod unit according to another embodiment.

[0032] Fig.17 This is a cross-sectional view schematically showing a state in which a tension lever and a left support arm of a conventional printer are assembled. DETAILED DESCRIPTION

[0033] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the embodiment described here is certainly not intended to specifically limit the present invention. In addition, the same reference numerals are marked for components / parts that play the same role, and repeated descriptions are appropriately omitted or simplified.

[0034] <First embodiment>

[0035] Figure 1 It is a perspective view of the printer 10 according to the present embodiment. Figure 21 is a right side view of the printer 10. The symbols F, Rr, L, R, U, and D in the figure represent the front, rear, left, right, top, and bottom of the printer 10, respectively. The symbols X, Y, and Z represent the front-to-back direction, the left-to-right direction, and the top-to-bottom direction, respectively. However, these directions are merely determined for the convenience of explanation and do not limit the installation method of the printer 10 in any way.

[0036] like Figure 1 As shown, the printer 10 is, for example, an inkjet printer. The printer 10 prints on a medium 5. The medium 5 is, for example, a roll of recording paper. The medium 5 can be any shape that can be wound around a winding shaft 41 of a winding unit 40 described later, and is not limited to recording paper. The medium 5 can be, for example, a resin sheet or film, a woven or non-woven fabric, or other medium.

[0037] like Figure 2 As shown, the printer 10 includes: a printer body 11 having a housing (not shown) extending in the left-right direction Y; and a platen 12 provided on the printer body 11. The platen 12 is an example of a support table of the present invention. The platen 12 supports the medium 5 during printing. In the present embodiment, the medium 5 is placed on the platen 12. The platen 12 is a member extending in the front-rear direction X and the left-right direction Y.

[0038] The printer 10 includes a guide rail 14 , a carriage 16 , and an inkjet head 18 . The guide rail 14 is disposed above the platen 12 , and although not shown, extends in the left-right direction Y. The carriage 16 engages with the guide rail 14 and is movable in the left-right direction Y along the guide rail 14 .

[0039] The inkjet head 18 is provided on the carriage 16 and is movable together with the carriage 16 in the left-right direction Y. The inkjet head 18 has a plurality of nozzles (not shown) opening downward and ejects ink from the nozzles. The inkjet head 18 ejects ink toward the medium 5 supported by the platen 12 .

[0040] The printer 10 includes: a transport mechanism 20 for transporting the medium 5 supported by the platen 12 in the front-rear direction X; and a head moving mechanism (not shown) for moving the carriage 16 and the inkjet head 18 in the left-right direction Y. Figure 2 As shown, the conveying mechanism 20 includes a grid roller 21 provided on the platen 12, a pinch roller 22 that pinches the medium 5 together with the grid roller 21, and a feed motor (not shown) connected to the grid roller 21. When the feed motor is driven to rotate the grid roller 21, the medium 5 is conveyed in the front-rear direction X.

[0041] Although not shown in the figure, the head moving mechanism for moving the carriage 16 and the inkjet head 18 in the left-right direction Y includes: left and right pulleys provided around the left and right ends of the guide rail 14; a belt wound around the left and right pulleys; and a carriage motor connected to the right pulley. By driving the carriage motor, the right pulley connected to the carriage motor rotates, and the belt wound around the left and right pulleys travels. As a result, the carriage 16 and the inkjet head 18 move in the left-right direction Y.

[0042] like Figure 2 As shown in FIG. 1 , the printer 10 includes a supply unit 30 for supplying the medium 5 to the platen 12. The supply unit 30 is arranged behind and below the platen 12. The supply unit 30 includes: a pair of left and right support plates 32; and a pair of left and right supply shafts 31 extending from the support plates 32 toward the center of the printer 10 in the left-right direction Y. Figure 2 , the right support plate 32 and the right supply shaft 31 are shown, but the left support plate 32 and the left supply shaft 31 are omitted. Although omitted, the pair of supply shafts 31 extend in a separated manner in the left-right direction Y. The roll-shaped medium 5 before printing is mounted on the pair of supply shafts 31. When the medium 5 is transported forward by the transport mechanism 20, the roll-shaped medium 5 mounted on the pair of supply shafts 31 is sent out from the pair of supply shafts 31 toward the platen 12.

[0043] like Figure 2 As shown in FIG. 1 , the printer 10 includes a winding unit 40 for winding the medium 5 supported by the platen 12 into a roll shape. The winding unit 40 is arranged below the platen 12. Figure 1 As shown, the winding unit 40 includes a winding shaft 41 , a winding motor 42 for rotating the winding shaft 41 , and a pair of left and right support plates 44 for axially supporting the winding shaft 41 .

[0044] The winding shaft 41 is formed in a cylindrical or columnar shape extending in the left-right direction Y. The medium 5 is wound on the circumferential surface of the winding shaft 41. The pair of support plates 44 includes a left support plate 44L and a right support plate 44R, and a pair of front and rear guide rails 45 extending in the left-right direction Y are mounted on the left support plate 44L and the right support plate 44R. The left end of the winding shaft 41 is rotatably supported by the left support plate 44L, and the right end of the winding shaft 41 is rotatably supported by the right support plate 44R. At least one of the pair of support plates 44 is configured to be movable along the guide rail 45 in the longitudinal direction of the guide rail 45 (here, the left-right direction Y). In this way, it is possible to handle media 5 of different lengths in the longitudinal direction of the winding shaft 41 (here, the left-right direction Y).

[0045] The winding motor 42 is connected to the winding shaft 41 to rotate the winding shaft 41. The winding motor 42 is indirectly connected to the winding shaft 41 via a reduction gear (not shown) or the like. In the present embodiment, the medium 5 printed on the platen 12 is conveyed forward. The winding shaft 41 receives the driving force of the winding motor 42 and rotates, thereby winding the medium 5 printed on the platen 12 around the peripheral surface of the winding shaft 41.

[0046] In this embodiment, the printer 10 includes a tension lever unit 50. The tension lever unit 50 applies tension to the portion of the medium 5 that is conveyed from the platen 12 toward the winding shaft 41. As a result, the medium 5 conveyed forward from the platen 12 is conveyed toward the winding shaft 41 in a taut state. Figure 2 As shown, the tension rod unit 50 is arranged below the platen 12. The tension rod unit 50 is provided in the printer body 11, and at least a part of the tension rod unit 50 is arranged in front of the printer body 11.

[0047] Next, the structure of the tension rod unit 50 is described in detail. Figure 1 As shown, the tension rod unit 50 includes a tension rod 51, a pair of support arms 52 supporting the tension rod 51, and a support member 55 axially supporting the pair of support arms 52 in a swingable manner. The tension rod 51 extends in the left-right direction Y. In other words, the central axis A1 (see Figure 8 ) extends in the left-right direction Y. The tension rod 51 is arranged in parallel with the supply shaft 31 of the supply unit 30, and is arranged in parallel with the winding shaft 41 of the winding unit 40. The tension rod 51 is tubular (specifically, cylindrical).

[0048] like Figure 1 As shown, a pair of support arms 52 supports the tension rod 51 and is rod-shaped. The pair of support arms 52 is arranged side by side. In the following description, the support arm 52 arranged on the left side is also referred to as the left support arm 52L. The support arm 52 arranged on the right side is also referred to as the right support arm 52R. The left support arm 52L supports the left end of the tension rod 51, and the right support arm 52R supports the right end of the tension rod 51. The left support arm 52L and the right support arm 52R are fixed to the support member 55. The support member 55 includes a left support member 55L and a right support member 55R. The left support member 55L and the right support member 55R are fixed to the printer body 11.

[0049] One end of the rod-shaped left support arm 52L supports the left end of the tension rod 51, and the other end of the left support arm 52L is supported by the left support member 55L. Here, the left support member 55L is provided with a left support shaft 56L extending rightward from the left support member 55L. The other end of the left support arm 52L is connected to the left support shaft 56L, and is indirectly supported by the printer body 11 via the left support shaft 56L and the left support member 55L.

[0050] Similarly, one end of the rod-shaped right support arm 52R supports the right end of the tension rod 51, and the other end of the right support arm 52R is supported by the right support member 55R. Here, the right support member 55R is provided with a right support shaft 56R (see Figure 2 The other end of the right support arm 52R is connected to the right support shaft 56R, and is indirectly supported by the printer body 11 via the right support shaft 56R and the right support member 55R.

[0051] In the present embodiment, the left support arm 52L and the right support arm 52R are configured to be able to swing freely around the left support shaft 56L and the right support shaft 56R, respectively. Therefore, the tension rod 51 supported by the pair of support arms 52 swings on a circular track around the left support shaft 56L and the right support shaft 56R. In the present embodiment, the tension rod 51 swings in a manner tilted forward due to its own weight, pressing the medium 5 forward and downward, thereby applying tension to the medium 5. In this way, in the present embodiment, the pair of support arms 52 swing freely around the left support shaft 56L and the right support shaft 56R, thereby supporting the tension rod 51 in a swingable manner.

[0052] In this embodiment, the tension rod 51 is embedded and fixed to a pair of support arms 52. Here, the structure of embedding and fixing the left support arm 52L and the tension rod 51 is the same as the structure of embedding and fixing the right support arm 52R and the tension rod 51. Therefore, the structure of embedding and fixing one support arm 52 (here, the right support arm 52R) and the tension rod 51 will be described in detail below.

[0053] In this embodiment, the tension rod 51 and the support arm 52 are not connected by other components (such as Fig.17 Here, the tension rod 51 and the support arm 52 are fixed to each other by a portion of the support arm 52 being embedded in the inner circumference of the tension rod 51.

[0054] In the following description, the front, rear, top, and bottom of the tension rod 51 and the support arm 52 refer to the front, rear, top, and bottom of the tension rod 51 and the support arm 52 when the longitudinal axis of the support arm 52 is arranged to extend along the front-rear direction X. Figure 5 As shown, the axis extending in the vertical direction Z in the radial direction of the tension rod 51 is referred to as the reference axis A2. The reference axis A2 passes through the central axis A1 extending in the horizontal direction Y of the tension rod 51 and intersects (specifically, is orthogonal to) the central axis A1.

[0055] like Figure 6 As shown, the support arm 52 has an arm body 60 and a fixing portion 70. Figure 7As shown in FIG. 1 , the arm body 60 is a plate-shaped member extending in the front-rear direction X. The arm body 60 extends in the front-rear direction X and the up-down direction Z. Figure 3 As shown, one end (here, the front end) of the arm body 60 supports the tension rod 51, and the other end (here, the rear end) of the arm body 60 is swingably supported on the printer body 11 (see Figure 2 ).

[0056] In this embodiment, if Fig.10 As shown in FIG. 1 , the arm body 60 is provided with an upper flange 68a extending from the upper end to the side opposite to the tension rod 51, and a lower flange 68b extending from the lower end to the side opposite to the tension rod 51. Furthermore, an upper longitudinal flange 69a extending downward from the opposite end is provided at the end of the upper flange 68a on the side opposite to the tension rod 51. A lower longitudinal flange 69b extending upward from the opposite end is provided at the end of the lower flange 68b on the side opposite to the tension rod 51. The upper longitudinal flange 69a and the lower longitudinal flange 69b are separated from each other in the upper and lower directions.

[0057] The fixing portion 70 is a component for fixing the tension rod 51, and a part of the fixing portion 70 is embedded in the inner peripheral surface of the tension rod 51. The fixing portion 70 is formed integrally with the arm body 60. In the present embodiment, the fixing portion 70 is formed at one end (here, the front end) of the arm body 60. The fixing portion 70 includes a first claw portion 61, a second claw portion 62, a third claw portion 63, and a contact claw portion 65.

[0058] The first claw portion 61 extends from the arm body 60 toward the inside of the tension rod 51. The first claw portion 61 extends in the left-right direction Y and is provided at the center of the arm body 60 in the up-down direction Z. Figure 5 As shown in FIG. 1 , when the tension rod 51 and the support arm 52 are embedded and fixed, at least a portion of the first claw portion 61 contacts the inner peripheral surface of the tension rod 51. Figure 8 As shown, the first claw portion 61 is provided at one end (here, the front end) of the arm body 60. The first claw portion 61 is arranged on the radial side (here, the front side) of the tension rod 51 relative to the central axis A1 of the tension rod 51. Figure 5 As shown, when viewed from the direction of the central axis A1 of the tension rod 51 , the first claw portion 61 overlaps with the reference axis A2 .

[0059] In addition, the shape of the first claw portion 61 is not particularly limited. In the present embodiment, the surface of the first claw portion 61 facing the inner circumference of the tension rod 51 is a flat surface, but it may also be a surface having a shape along the inner circumference of the tension rod 51. Here, the cross-sectional shape of the first claw portion 61 is a quadrilateral. More specifically, the cross-sectional shape of the first claw portion 61 is a rectangular shape that is longer in the up-down direction Z than in the front-to-back direction X. Fig.10As shown, the front end portion of the first claw portion 61 has a tapered shape, and the length (in other words, the width) in the up-down direction Z becomes shorter toward the front end. In the present embodiment, the corners of the first claw portion 61 are chamfered.

[0060] In this embodiment, if Fig.10 As shown, a first inner insertion hole 71 is provided through (in other words, formed) the first claw portion 61. The first inner insertion hole 71 is provided through the front end portion of the first claw portion 61 and penetrates the first claw portion 61 along the front-to-back direction X. Figure 5 As shown, a first outer insertion hole 81 is provided through the position of the tension rod 51 corresponding to the first inner insertion hole 71, that is, the portion of the tension rod 51 overlapping the first inner insertion hole 71. The first outer insertion hole 81 is provided through the end and the front portion of the tension rod 51, and penetrates from the inner peripheral surface to the outer peripheral surface in the front-rear direction X. The first screw 91 is inserted into the first inner insertion hole 71 and the first outer insertion hole 81. In this way, by inserting the first screw 91, the first screw 91 is screwed into the first inner insertion hole 71 and the first outer insertion hole 81. Therefore, the tension rod 51 and the first claw portion 61 are fixed to each other.

[0061] like Fig.10 As shown in FIG. 1 , the second claw 62 and the third claw 63 extend from the arm body 60 toward the inside of the tension rod 51 in the same manner as the first claw 61. The second claw 62 and the third claw 63 extend in the left-right direction Y. Figure 5 As shown, when the tension rod 51 and the support arm 52 are embedded and fixed, at least a portion of the second claw portion 62 and at least a portion of the third claw portion 63 are in contact with the inner peripheral surface of the tension rod 51. Figure 8 and Fig. 9 As shown in FIG. 1 , the second claw 62 and the third claw 63 are provided at one end (here, the front end) of the arm body 60 and are arranged behind the first claw 61. Fig.10 As shown, the second claw 62 is arranged above the first claw 61, and the third claw 63 is arranged below the first claw 62 and the second claw 63. Figure 5 As shown, the second claw 62 and the third claw 63 are arranged at the same position in the front-rear direction X and face each other across the reference axis A2. When viewed from the direction of the center axis A1 of the tension rod 51, the second claw 62 and the third claw 63 face each other across the center axis A1.

[0062] The shapes and sizes of the second claw portion 62 and the third claw portion 63 are not particularly limited. Fig.10 As shown, the second claw portion 62 and the third claw portion 63 have the same shape and the same size. Figure 5As shown, the surface of each of the second claw 62 and the third claw 63 facing the tension rod 51 is a flat surface, but it can also have a shape along the inner circumference of the tension rod 51. The cross-sectional shape of each of the second claw 62 and the third claw 63 is a quadrilateral shape, similar to the first claw 61. In detail, the cross-sectional shape of each of the second claw 62 and the third claw 63 is a rectangular shape that is longer in the front-to-back direction X than in the up-down direction Z. In addition, as shown in FIG. Figure 8 and Fig. 9 As shown, the front end of each of the second claw 62 and the third claw 63 has a tapered shape, and the length (in other words, the width) in the front-rear direction X becomes shorter toward the front end. The corners of the second claw 62 and the third claw 63 are chamfered.

[0063] In the present embodiment, the length L2 of the second claw 62 in the left-right direction Y is the same as the length L3 of the third claw 63 in the left-right direction Y. Furthermore, the lengths L1, L2, and L3 of the second claw 62 and the third claw 63 are the same as the lengths L1, L2, and L3 of the first claw 61 in the left-right direction Y, respectively. However, the lengths L1, L2, and L3 of the first claw 61, the second claw 62, and the third claw 63 in the left-right direction Y may be different.

[0064] In this embodiment, if Figure 8 and Fig. 9 As shown, a second inner insertion hole 72 is provided through (in other words, formed) the second claw portion 62, and a third inner insertion hole 73 is provided through the third claw portion 63. The second inner insertion hole 72 and the third inner insertion hole 73 are provided through the front end portions of the second claw portion 62 and the third claw portion 63, respectively, and penetrate the second claw portion 62 and the third claw portion 63 in the up-down direction Z. In the present embodiment, the first inner insertion hole 71, the second inner insertion hole 72, and the third inner insertion hole 73 are arranged at the same position in the left-right direction Y, but may also be arranged at different positions in the left-right direction Y.

[0065] like Figure 5As shown, a second outer insertion hole 82 is provided through the tension rod 51 at a position corresponding to the second inner insertion hole 72 and at a portion of the tension rod 51 overlapping the second inner insertion hole 72. A third outer insertion hole 83 is provided through the tension rod 51 at a position corresponding to the third inner insertion hole 73 and at a portion of the tension rod 51 overlapping the third inner insertion hole 73. The second outer insertion hole 82 is provided through the end and the upper portion of the tension rod 51 and penetrates from the inner circumference to the outer circumference in the up-down direction Z. The third outer insertion hole 83 is provided through the end and the lower portion of the tension rod 51 and penetrates from the inner circumference to the outer circumference in the up-down direction Z. Here, the second outer insertion hole 82 and the third outer insertion hole 83 are opposite to each other across the center axis A1 (in other words, the reference axis A2) of the tension rod 51. The second outer insertion hole 82 and the third outer insertion hole 83 are respectively long holes that are long in the front-back direction X. In the present embodiment, the first outer insertion hole 81 , the second outer insertion hole 82 , and the third outer insertion hole 83 are arranged at the same position in the left-right direction Y, but may be arranged at different positions in the left-right direction Y.

[0066] In the present embodiment, the second screw 92 is inserted into the second inner insertion hole 72 and the second outer insertion hole 82. By inserting the second screw 92, the second screw 92 is screwed into the second inner insertion hole 72. As a result, the tension rod 51 and the second claw portion 62 are fixed. Similarly, the third screw 93 is inserted into the third inner insertion hole 73 and the third outer insertion hole 83. By inserting the third screw 93, the third screw 93 is screwed into the third inner insertion hole 73. As a result, the tension rod 51 and the third claw portion 63 are fixed.

[0067] like Figure 6 As shown in FIG. 5 , the contact claw portion 65 is a member for positioning the tension rod 51 relative to the support arm 52 by abutting against the end of the tension rod 51. Figure 3 As shown in FIG. 5 , the contact claw portion 65 extends from the arm body 60 toward the outside of the tension rod 51. Figure 5 As shown, the contact claw portion 65 is disposed on the other side (here, the rear side) of the tension rod 51 in the radial direction relative to the central axis A1 of the tension rod 51 , and a front end 65 a of the contact claw portion 65 contacts the outer peripheral surface of the tension rod 51 .

[0068] In this embodiment, if Figure 6 As shown in FIG. 1 , the arm body 60 is provided with two contact claws 65, and the two contact claws 65 are arranged side by side in the vertical direction Z. Hereinafter, the upper contact claw 65 is referred to as the first contact claw 66, and the lower contact claw 65 is referred to as the second contact claw 67. Figure 5As shown, the first contact claw portion 66 and the second contact claw portion 67 are arranged at positions opposite to each other across the reference axis A2. The first contact claw portion 66 and the second contact claw portion 67 are line symmetrical with the reference axis A2 as the center, and the distance from the first contact claw portion 66 to the reference axis A2 is the same as the distance from the second contact claw portion 67 to the reference axis A2. The first contact claw portion 66 and the second contact claw portion 67 are arranged at the same position in the front-to-back direction X. The first contact claw portion 66 and the second contact claw portion 67 are respectively arranged at the rear of the first claw portion 61 to the third claw portion 63. The first contact claw portion 66 is arranged at the same position as the second claw portion 62 in the up-down direction Z. The second contact claw portion 67 is arranged at the same position as the third claw portion 63 in the up-down direction Z.

[0069] In addition, the shape and size of the first contact claw portion 66 and the second contact claw portion 67 are not particularly limited. Here, the first contact claw portion 66 and the second contact claw portion 67 have the same shape and the same size. In the present embodiment, the cross-sectional shape of each of the first contact claw portion 66 and the second contact claw portion 67 is a quadrilateral shape, specifically, a rectangular shape that is longer in the front-to-back direction X than in the up-down direction Z. In addition, as Figure 8 and Fig. 9 As shown, the front end of each of the first contact claw 66 and the second contact claw 67 has a tapered shape, and the length (in other words, the width) in the front-rear direction X becomes shorter as it approaches the front end. The corners of the first contact claw 66 and the second contact claw 67 are chamfered. In the present embodiment, the lengths L4 and L5 of the first contact claw 66 and the second contact claw 67 in the left-right direction Y are shorter than the lengths L1, L2, and L3 of the first claw 61 to the third claw 63 in the left-right direction Y.

[0070] In the present embodiment, the support arm 52 is formed of metal. Here, the arm body 60 and the fixing portion 70 (specifically, the first claw portion 61, the second claw portion 62, the third claw portion 63, the first contact claw portion 66, and the second contact claw portion 67) of the support arm 52 are formed integrally, but may also be other components fixed to each other by welding or the like. In the present embodiment, the support arm 52 is formed by stamping and cutting a metal plate, and the arm body 60, the first claw portion 61, the second claw portion 62, the third claw portion 63, the first contact claw portion 66, and the second contact claw portion 67 are made of a metal plate.

[0071] In this embodiment, if Figure 7As shown, a quadrilateral first hole 60a, a second hole 60b, a third hole 60c, and a fourth hole 60d are formed at one end (here, the front end) of the arm body 60 of the support arm 52. Here, the second claw 62 is formed by cutting the remaining metal plate when the first hole 60a is formed. Similarly, the third claw 63, the first contact claw 66, and the second contact claw 67 are formed by cutting the remaining metal plate when the second hole 60b, the third hole 60c, and the fourth hole 60d are formed.

[0072] In this embodiment, a rod-shaped first reinforcing portion 60e, a second reinforcing portion 60f, a third reinforcing portion 60g, and a fourth reinforcing portion 60h are provided between the first hole 60a and the second hole 60b, between the third hole 60c and the fourth hole 60d, between the first hole 60a and the third hole 60c, and between the second hole 60b and the fourth hole 60d, respectively. The arm body 60 is reinforced by the first reinforcing portion 60e to the fourth reinforcing portion 60h.

[0073] In this embodiment, the tension rod 51 and the support arm 52 are embedded and fixed according to the following steps. Figure 5 As shown, first, a part of the fixing portion 70 of the support arm 52 (specifically, the first claw portion 61, the second claw portion 62, and the third claw portion 63) is inserted into the tension rod 51 in such a manner that the first claw portion 61, the second claw portion 62, and the third claw portion 63 of the support arm 52 are inserted into the tension rod 51. At this time, a gap (not shown) is formed between the inner peripheral surface of the tension rod 51 and the first claw portion 61 of the support arm 52, and the inner peripheral surface of the tension rod 51 is separated from the first claw portion 61. Here, the front ends 65a of the first contact claw portion 66 and the second contact claw portion 67 of the support arm 52 are in contact with the outer peripheral surface of the tension rod 51. In this way, the position of the tension rod 51 relative to the support arm 52 can be made consistent to some extent.

[0074] Before the tension rod 51 contacts the arm body 60, when the first claw 61 to the third claw 63 are inserted into the tension rod 51, the first inner insertion hole 71 provided through the first claw 61 overlaps with the first outer insertion hole 81 provided through the tension rod 51. Therefore, next, the first screw 91 is inserted from the outside of the tension rod 51 and fastened to the first inner insertion hole 71 and the first outer insertion hole 81. As a result, the first claw 61 is pulled toward the inner peripheral surface side of the tension rod 51 ( Figure 5 The gap between the inner circumference of the tension rod 51 and the first claw 61 is narrowed, and a portion (here, the edge portion) of the first claw 61 contacts the inner circumference of the tension rod 51. At this time, as the first claw 61 is pulled toward the inner circumference of the tension rod 51, the first contact claw 66 and the second contact claw 67 formed integrally with the arm body 60 are pulled toward the outer circumference of the tension rod 51 (at the top of the tension rod 51) in the same manner as the first claw 61. Figure 5As a result, the outer peripheral surface of the tension rod 51 is pressed by the first contact claw 66 and the second contact claw 67. As a result, the tension rod 51 is clamped at three points, namely, the first screw 91 inserted into the first inner insertion hole 71 of the first claw 61, the first contact claw 66, and the second contact claw 67, so that the position of the tension rod 51 relative to the support arm 52 is fixed.

[0075] In the present embodiment, when the first screw 91 is inserted into the first inner insertion hole 71 of the first claw portion 61 and the first outer insertion hole 81 of the tension rod 51, the second inner insertion hole 72 of the second claw portion 62 overlaps with the second outer insertion hole 82 of the tension rod 51, and the third inner insertion hole 73 of the third claw portion 63 overlaps with the third outer insertion hole 83 of the tension rod 51. Then, the second screw 92 is inserted into the second inner insertion hole 72 and the second outer insertion hole 82, and the third screw 93 is inserted into the third inner insertion hole 73 and the third outer insertion hole 83, and the second screw 92 and the third screw 93 are tightened. Thus, the second claw portion 62 and the third claw portion 63 are fixed to the tension rod 51, and the tension rod 51 can be fixed more firmly to the support arm 52.

[0076] The above operations are performed on the left support arm 52L and the right support arm 52R, and the left support arm 52L and the right support arm 52R are embedded in and fixed to the tension rod 51. Figure 1 As shown in FIG. 1 , the left support arm 52L and the right support arm 52R are mounted to the printer body 11 so as to be swingable relative to the printer body 11 .

[0077] In the above embodiment, Figure 2 As shown, the printer 10 includes: a platen 12 that supports the medium 5 during printing; a winding shaft 41 that winds up the printed medium 5; and a tension lever unit 50 that applies tension to the portion of the medium 5 from the platen 12 toward the winding shaft 41. Figure 1 As shown in FIG. 1 , the tension rod unit 50 includes a cylindrical tension rod 51 and a pair of support arms 52 provided at both ends of the tension rod 51 and supporting the tension rod 51 in a swingable manner. Figure 3 As shown in FIG. 1 , the support arm 52 includes an arm body 60 that supports the tension rod 51 so as to swing freely, and a fixing portion 70 that is formed integrally with the arm body 60. The fixing portion 70 is embedded in the inner peripheral surface of the tension rod 51 and fixed to the tension rod 51. Thus, by embedding the fixing portion 70 of the support arm 52 in the cylindrical tension rod 51, the support arm 52 and the tension rod 51 can be fixed. Therefore, the conventional intermediate member 153 (see FIG. 1 ) is not used. Fig.17 ), and without using a sealant, the support arm 52 and the tension rod 51 can be fixed. Therefore, the number of components of the tension rod unit 50 can be reduced, and the operation time for assembling the tension rod 51 and the support arm 52 can be shortened.

[0078] In this embodiment, if Figure 6 As shown, the fixing portion 70 has a first claw portion 61 and a contact claw portion 65. Figure 3 As shown, the first claw portion 61 extends from the arm body 60 toward the tension rod 51. Figure 5 As shown, the first claw 61 is embedded in the inner peripheral surface of the tension rod 51 on one side (here, the front side) radially closer to the center axis A1 of the tension rod 51 and fixed to the tension rod 51. The contact claw 65 extends from the arm body 60 to the outside of the tension rod 51 and contacts the outer peripheral surface of the tension rod 51 on the other side (here, the rear side) radially closer to the center axis A1. Thus, by making the tension rod 51 abut against the contact claw 65, the first claw 61 can be brought into contact with the inner peripheral surface of the tension rod 51, and the contact claw 65 can be brought into contact with the outer peripheral surface of the tension rod 51. Therefore, the first claw 61 and the contact claw 65 make it easy to align the tension rod 51 with respect to the support arm 52.

[0079] In the present embodiment, the first inner insertion hole 71 is provided through the first claw portion 61. The first outer insertion hole 81 is provided through the tension rod 51 at a position overlapping with the first inner insertion hole 71. The first claw portion 61 and the tension rod 51 are fixed by a first screw 91 inserted into the first inner insertion hole 71 and the second outer insertion hole 81. Thus, by tightening the first screw 91, the tension rod 51 can be pressed against the contact claw portion 65 while the first claw portion 61 and the tension rod 51 can be fixed. Therefore, the position of the tension rod 51 relative to the support arm 52 can be determined, and the tension rod 51 and the support arm 52 can be fixed.

[0080] In the present embodiment, when the tension rod 51 is viewed from the axial direction, the reference axis A2 extends from one side (here, the front side) to the other side (here, the rear side) of the tension rod 51 in the radial direction, and is an axis intersecting the center axis A1 of the tension rod 51. When the tension rod 51 is viewed from the axial direction, the first claw portion 61 is arranged on the reference axis A2. The contact claw portion 65 includes a first contact claw portion 66 and a second contact claw portion 67 arranged at positions opposite to each other across the reference axis A2. Thus, by pressing the tension rod 51 against the contact claw portion 65, the position of the tension rod 51 relative to the support arm 52 can be made consistent in such a way that the radial center of the tension rod 51 is arranged on the reference axis A2.

[0081] In this embodiment, if Figure 8 and Fig. 9 As shown, the width (here, the length in the front-rear direction X) of each of the front ends of the first contact claw portion 66 and the second contact claw portion 67 decreases as it moves toward the front end. Therefore, when the first claw portion 61 to the third claw portion 63 of the support arm 52 are inserted into the tension rod 51, even if the front ends of the first contact claw portion 66 and the second contact claw portion 67 are in contact with the tension rod 51, the first claw portion 61 to the third claw portion 63 can be inserted into the tension rod 51 while being guided by the front ends.

[0082] In this embodiment, if Figure 5 and Fig.10 As shown, the fixing portion 70 includes a second claw portion 62 and a third claw portion 63 extending from the arm body 60 toward the inside of the tension rod 51 and arranged at positions opposite to each other across the reference axis A2. Figure 5 As shown, the second claw portion 62 is provided with a second inner insertion hole 72, and the third claw portion 63 is provided with a third inner insertion hole 73. The tension rod 51 is provided with a second outer insertion hole 82 at a position overlapping with the second inner insertion hole 72, and the third outer insertion hole 83 at a position overlapping with the third inner insertion hole 73. Thus, by tightening the second screw 92 inserted into the second inner insertion hole 72 and the second outer insertion hole 82, the second claw portion 62 and the tension rod 51 can be fixed. In addition, by tightening the third screw 93 inserted into the third inner insertion hole 73 and the third outer insertion hole 83, the third claw portion 63 and the tension rod 51 can be fixed. Therefore, the tension rod 51 and the one support arm 52 can be fixed more firmly at three points of the first screw 91 to the third screw 93.

[0083] In this embodiment, if Figure 8 and Fig. 9 As shown, the length of the first contact claw 66 and the second contact claw 67 in the left-right direction Y is shorter than at least any one of the first claw 61, the second claw 62, and the third claw 63. Therefore, when the first claw 61 to the third claw 63 are inserted into the tension rod 51, the insertion of the first claw 61 to the third claw 63 can be started before the first contact claw 66 and the second contact claw 67 come into contact with the tension rod 51. Therefore, when the first claw 61 to the third claw 63 are inserted into the tension rod 51, the first contact claw 66 and the second contact claw 67 can start the insertion without hitting the tension rod 51.

[0084] The printer 10 of the first embodiment is described above. The printer proposed here is not limited to the printer 10 of the first embodiment, and can be implemented in various other ways. Next, other embodiments are briefly described. In addition, in the following description, the same reference numerals are used for the same structures as those already described, and their descriptions are omitted.

[0085] <Second embodiment>

[0086] Next, a printer 10A according to a second embodiment will be described. Fig.11 It is a perspective view showing a tension rod unit 50A of the printer 10A according to the present embodiment. Fig.12 2 is a diagram showing the tension rod unit 50A when viewed from the axial direction of the tension rod 51. Fig.11As shown, the printer 10A of this embodiment includes a tension rod unit 50A. The tension rod unit 50A is different from the tension rod unit 50 of the first embodiment (see Figure 3 ) Similarly, it has a tension rod 51 and a pair of support arms 52 for supporting the tension rod 51. In the tension rod unit 50A, the tension rod 51 is lowered by its own weight, so that Figure 2 As shown, tension can be applied to the portion of the medium 5 that extends from the platen 12 toward the winding shaft 41 .

[0087] However, in the present embodiment, the media 5 printed by the printer 10A include various types of media, such as media of different thicknesses and media of different materials. Depending on the type of the medium 5, the tension required to properly wind the medium 5 using the winding shaft 41 and the magnitude of the tension applied by the tension rod 51 may be different. In order to change the magnitude applied to the medium 5, for example, it is conceivable to replace the current tension rod 51 with a tension rod 51 of a different weight. However, replacing the tension rod 51 itself is not easy.

[0088] Therefore, in this embodiment, if Fig.11 As shown, the tension rod unit 50A has a counterweight 110. The counterweight 110 is added to the tension rod unit 50A, and the magnitude of the tension applied to the medium 5 by the tension rod 51 is adjusted according to the weight of the counterweight 110. Here, for example, the counterweight 110 is mounted on the support arm 52 of the tension rod unit 50A. However, the support arm 52 is relatively small, for example, the width is small. Therefore, since the space for mounting the counterweight 110 on the support arm 52 is limited, it is difficult to mount the relatively heavy counterweight 110 on the support arm 52.

[0089] Therefore, in this embodiment, if Fig.11 As shown, the weight 110 is housed in the tension rod 51. The weight 110 is disposed in the tension rod 51 and is detachable from the tension rod 51. In the present embodiment, the weight 110 extends in the axial direction of the tension rod 51 (here, the left-right direction Y). Fig.13 It is a perspective view showing the counterweight 110 . Fig.14 yes Fig.13 This is an enlarged view of part A. Fig.13 As shown, the counterweight 110 is a plate-shaped member formed by bending the plate-shaped member. The length of the counterweight 110 in the left-right direction Y is, for example, substantially the same as the length of the tension rod 51 in the left-right direction Y, that is, the axial length, and substantially the same as the distance in the left-right direction Y from the left support arm 52L to the right support arm 52R.

[0090] Fig.15 (a) Fig.15 (b) Fig.15(c) are respectively a bottom view, a front view, and a right side view of the counterweight 110. In this embodiment, Fig.15 As shown in (c), the cross-sectional shape of the counterweight 110 (here, the cross-sectional shape along the front-rear direction X) is a U-shaped shape. Fig.13 As shown, the counterweight 110 has a pair of first plate-shaped portions 111 and a second plate-shaped portion 112. The pair of first plate-shaped portions 111 face each other in the vertical direction Z. The first plate-shaped portion 111 is a plate-shaped portion. Fig.12 As shown, when viewed from the axial direction of the tension rod 51, it extends in the front-rear direction X. Here, the up-down direction Z is an example of the first direction of the present invention, and the front-rear direction X is an example of the second direction of the present invention. Fig.13 As shown in FIG. 1 , the first plate-shaped portion 111 extends in the left-right direction Y and the front-back direction X. The first plate-shaped portion 111 is a plate-shaped portion that is longer in the left-right direction Y than in the front-back direction X.

[0091] The second plate-shaped portion 112 is a plate-shaped portion, such as Fig.12 As shown in FIG. 5 , when viewed from the axial direction of the tension rod 51, it extends in the up-down direction Z. Fig.13 As shown, the second plate-shaped portion 112 extends in the left-right direction Y and the up-down direction Z. The second plate-shaped portion 112 is longer in the left-right direction Y than in the up-down direction Z. Fig.15 As shown in (c), the second plate-like portion 112 is disposed between a pair of first plate-like portions 111 and is continuous with the pair of first plate-like portions 111. In this embodiment, one end (here, the lower end) of the second plate-like portion 112 is connected to one end (here, the rear end) of the lower first plate-like portion 111. The other end (here, the upper end) of the second plate-like portion 112 is connected to one end (here, the rear end) of the upper first plate-like portion 111.

[0092] The material forming the weight 110 is not particularly limited. Here, the weight 110 is made of metal, for example.

[0093] In this embodiment, the counterweight 110 is supported by the support arm 52 in the tension rod 51. Here, the left end of the counterweight 110 is supported by the left support arm 52L, and the right end of the counterweight 110 is supported by the right support arm 52R. The structure of the support arm 52 supporting the counterweight 110 is not particularly limited.

[0094] In this embodiment, if Fig.12 As shown, a support portion 160 for supporting the counterweight 110 is provided on the arm body 60 of the support arm 52. The support portion 160 constitutes the front portion of the arm body 60. A hole 170 is formed in the front portion of the arm body 60. The hole 170 penetrates the arm body 60. The hole 170 is rectangular, but the shape of the hole 170 is not particularly limited.

[0095] In this embodiment, a first rod-shaped portion 171 is provided at both ends of the hole 170 so as to cross the hole 170. The first rod-shaped portion 171 extends in the up-down direction Z. A second rod-shaped portion 172 is provided at both ends of the hole 170 so as to cross the hole 170. Here, the second rod-shaped portion 172 intersects (orthogonally intersects) with the first rod-shaped portion 171, and the intersection portion is formed integrally. The hole 170 is divided into four first holes 60a, a second hole 60b, a third hole 60c, and a fourth hole 60d by the first rod-shaped portion 171 and the second rod-shaped portion 172.

[0096] In this embodiment, the ends of the counterweight 110 are supported by the support portion 160 of the support arm 52. Specifically, the left end of the counterweight 110 is supported by the support portion 160 of the left support arm 52L, and the right end of the counterweight 110 is supported by the support portion 160 of the right support arm 52R. Fig.14 As shown in FIG. 1 , first grooves 181 are formed at the ends (here, the left and right ends) of a pair of first plate-shaped portions 111 of the counterweight 110. Fig.15 As shown in (a), two protrusions 181a and 181b are formed in a front-to-rear arrangement at the end of the first plate-shaped portion 111, and a first groove 181 is formed between the protrusions 181a and 181b. The width of the first groove 181 increases as it moves toward the end of the first plate-shaped portion 111. Fig.11 As shown, the first rod-shaped portion 171 of the support arm 52 is fitted into the first groove 181 of the pair of first plate-shaped portions 111 .

[0097] like Fig.14 As shown in FIG. 1 , second grooves 182 are formed at the ends (here, the left and right ends) of the second plate-shaped portion 112 of the counterweight 110. Fig.13 , the second groove 182 formed at the right end of the second plate-shaped portion 112 is shown, but the second groove 182 is also formed at the left end of the second plate-shaped portion 112. Fig.15 As shown in (b), the width of the second groove 182 increases as it moves toward the end of the second plate-shaped portion 112. Fig.15 (a) and Fig.15 As shown in (b), the width of the second groove 182 is smaller than the width of the first groove 181, but may be larger than the width of the first groove 181, or may be the same as the width of the first groove 181. Fig.11 As shown, the second rod-shaped portion 172 of the support arm 52 engages in the second groove 182 .

[0098] In the present embodiment, the first rod-shaped portion 171 of the left supporting arm 52L is inserted into the first groove 181 formed at the left end of the pair of first plate-shaped portions 111 of the counterweight 110, and the second rod-shaped portion 172 of the left supporting arm 52L is inserted into the second groove 182 formed at the left end of the second plate-shaped portion 112 of the counterweight 110. Thus, the left supporting arm 52L can support the counterweight 110. Similarly, the first rod-shaped portion 171 of the right supporting arm 52R is inserted into the first groove 181 formed at the right end of the pair of first plate-shaped portions 111 of the counterweight 110, and the second rod-shaped portion 172 of the right supporting arm 52R is inserted into the second groove 182 formed at the right end of the second plate-shaped portion 112 of the counterweight 110. Thus, the right supporting arm 52R can support the counterweight 110.

[0099] In this embodiment, a plurality of counterweights 110 of different weights are prepared. The weights of the plurality of counterweights 110 are made different, for example, by making the thickness of the first plate-shaped portion 111 or the second plate-shaped portion 112 different. In addition, when making the weights of the counterweights 110 different, the thickness of the entire first plate-shaped portion 111 or the second plate-shaped portion 112 may be made different, or the thickness of a portion (for example, only the left and right ends or only the central portion) may be made different. For example, by reducing the thickness of the counterweight 110, a light counterweight 110 can be prepared, and by increasing the thickness of the counterweight 110, a heavy counterweight 110 can be prepared.

[0100] The extent of the extension of the medium 5 varies depending on the type of the medium 5 and the characteristics of the thickness of the medium 5. Therefore, the tension of the tension rod 51 on the medium 5 is determined in consideration of the characteristics of the medium 5. For example, when winding a medium 5 of relatively thin thickness, a relatively large tension is required. In this case, the heavy weight 110 is accommodated in the tension rod 51. Thus, the force of the tension rod 51 to descend can be strengthened by the self-weight of the tension rod 51 and the heavy weight 110. Therefore, a large tension can be applied to the portion of the medium 5 from the platen 12 toward the winding shaft 41. On the other hand, when winding a medium 5 of relatively thick thickness, a relatively small tension can also be applied. In this case, the heavy weight 110 is replaced with a light weight 110, and the light weight 110 is accommodated in the tension rod 51. Thus, the force of the tension rod 51 to descend can be weakened by the self-weight of the tension rod 51 and the light weight 110. Therefore, a small tension can be applied to the portion of the medium 5 that extends from the platen 12 toward the winding shaft 41 .

[0101] In the above embodiment, Fig.11 As shown in FIG. 1 , the tension rod unit 50A is disposed in the tension rod 51 and has a weight 110 that is detachable from the tension rod 51. Therefore, when it is desired to change the tension applied by the tension rod 51 to the medium 5, it is only necessary to change the weight of the weight 110 disposed in the tension rod 51. Therefore, by changing the weight of the weight 110 according to the type of the medium 5, the appropriate tension applied to the medium 5 can be easily changed.

[0102] In addition, in this embodiment, the counterweight 110 is arranged in the tension rod 51. Therefore, compared with the case where the counterweight 110 is attached to the support arm 52, for example, the counterweight 110 can be arranged farther from the fulcrum (here, the left support shaft 56L and the right support shaft 56R (see Figure 2 Therefore, the counterweight 110 can be arranged at an effective position.

[0103] In this embodiment, the counterweight 110 extends in the tension rod 51 along the axial direction of the tension rod 51 (here, the left-right direction Y). Thus, the weight of the counterweight 110 can be evenly added to the tension rod 51 in the left-right direction Y. Therefore, the tension can be evenly applied to the medium 5 in the left-right direction Y.

[0104] In this embodiment, if Fig.13 As shown in FIG. 1 , the counterweight 110 is in the shape of a plate formed by bending. More specifically, the cross-sectional shape of the counterweight 110 is in the shape of a letter U. By bending the plate-shaped member to form the cross-sectional shape in the shape of a letter U, the rigidity of the counterweight 110 can be increased. By increasing the rigidity of the counterweight 110, even if the counterweight 110 extends in the left-right direction Y, it is difficult for the counterweight 110 to bend in the tension rod 51.

[0105] In this embodiment, if Fig.11 As shown, the counterweight 110 is supported by the support arm 52. Thus, the counterweight 110 can be assembled at the positions of the left and right ends of the tension rod 51, so the assembly is easy.

[0106] In the present embodiment, a hole 170 is formed in the arm body 60 of the support arm 52. The support arm 52 includes a first rod-shaped portion 171 extending in a predetermined first direction (here, the vertical direction Z) and spanning both ends of the hole 170 in the vertical direction Z. When viewed from the axial direction of the tension rod 51, the counterweight 110 includes a first plate-shaped portion 111 extending in a second direction (here, the front-rear direction X) intersecting the first direction. A first groove 181 for inserting the first rod-shaped portion 171 is formed at the end of the first plate-shaped portion 111. In this way, by inserting the first rod-shaped portion 171 of the support arm 52 into the first groove 181 of the first plate-shaped portion 111 of the counterweight 110, it is possible to make it difficult for the counterweight 110 to move in the front-rear direction X relative to the tension rod 51. Therefore, it is possible to suppress the shaking of the counterweight 110 in the front-rear direction X relative to the tension rod 51.

[0107] In the present embodiment, the support arm 52 has a second rod-shaped portion 172 extending in the front-rear direction X and provided at both ends of the hole 170 in the front-rear direction X. When viewed from the axial direction of the tension rod 51, the counterweight 110 has a second plate-shaped portion 112 extending in the up-down direction Z. A second groove 182 for inserting the second rod-shaped portion 172 is formed at the end of the second plate-shaped portion 112. In this way, by inserting the second rod-shaped portion 172 of the support arm 52 into the second groove 182 of the second plate-shaped portion 112 of the counterweight 110, it is possible to make it difficult for the counterweight 110 to move in the up-down direction Z relative to the tension rod 51. Therefore, it is possible to suppress the shaking of the counterweight 110 in the up-down direction Z relative to the tension rod 51.

[0108] In addition, in this embodiment, the counterweight 110 is a component extending in the axial direction of the tension rod 51, and is a component that covers the entire axial direction of the tension rod 51. Fig.16 As shown, the weight 110A may be a member disposed inside the end of the tension rod 51. The weight 110A is, for example, a member embedded in the tension rod 51 and may be a cylindrical shape whose length in the left-right direction Y is shorter than that of the tension rod 51.

[0109] The number of the counterweights 110A is not particularly limited. For example, one counterweight 110A may be disposed inside the left end of the tension rod 51 and one counterweight 110A may be disposed inside the right end of the tension rod 51 .

[0110] In the present embodiment, the weight 110 is made of metal, but the weight 110 is not limited to metal and may be made of resin. In addition, the weight 110 may be formed by, for example, injecting a liquid resin material into the tension rod 51 and solidifying it.

[0111] Description of symbols

[0112] 5 Medium

[0113] 10, 10A Printer

[0114] 12. Pressing plate (supporting platform)

[0115] 41 Winding shaft

[0116] 50, 50A tension rod unit

[0117] 51 tension rod

[0118] 52 Support arm

[0119] 60 Arm body

[0120] 61 First Claw

[0121] 62 Second claw

[0122] 63 Third claw

[0123] 65 Contact claw part

[0124] 66 First contact claw part

[0125] 67 Second contact claw part

[0126] 110 Weight distribution

[0127] 111 First plate-shaped part

[0128] 112 Second plate-shaped part

[0129] 170 holes

[0130] 171 First rod-shaped part

[0131] 172 Second rod-shaped part

[0132] 181 Tank 1

[0133] 182 Second tank.

Claims

1. A printer having: A support table for supporting the medium during printing; A winding shaft for winding the printed medium; and A tension rod unit applies tension to a portion of the medium extending from the support platform toward the winding shaft. The tension rod unit comprises: A cylindrical tension rod; a pair of supporting arms, disposed at both ends of the tensioning rod, to support the tensioning rod in a swingable manner; and A counterweight is separately arranged inside the cylindrical portion of the cylindrical tension rod, The support arm has: an arm body, supporting the tension rod in a swingable manner; and A fixing portion is formed integrally with the arm body, The fixing portion is embedded in the inner peripheral surface of the tension rod and fixed to the tension rod. The counterweight extends in the tension rod along the axial direction of the tension rod, and both ends of the counterweight are supported by the fixing portion. A hole is formed in the arm body of the support arm, The support arm has a first rod-shaped portion, the first rod-shaped portion extends along a predetermined first direction and is bridged between both ends of the hole in the first direction. The weight includes a first plate-shaped portion extending in a second direction intersecting the first direction when viewed from the axial direction of the tension rod, and the first plate-shaped portion is supported by the first rod-shaped portion.

2. The printer according to claim 1, wherein: The counterweight is removable relative to the tension rod.

3. The printer according to claim 2, wherein: The counterweight is a plate-shaped component formed by bending.

4. The printer according to claim 3, wherein: The cross-sectional shape of the counterweight is a U-shape.

5. The printer according to claim 1, wherein: A first groove is formed at an end portion of the first plate-shaped portion, and the first rod-shaped portion is fitted into the first groove.

6. The printer according to claim 5, wherein: The support arm has a second rod-shaped portion, the second rod-shaped portion extends along the second direction and is arranged at both ends of the hole in the second direction. When viewed from the axial direction of the tension rod, the counterweight has a second plate-shaped portion extending along the first direction, A second groove is formed at an end portion of the second plate-shaped portion, and the second rod-shaped portion is fitted into the second groove.

7. The printer according to any one of claims 1 to 6, wherein: The fixing portion has: A first claw portion extends from the arm body toward the inside of the tension rod and is embedded in the inner peripheral surface of the tension rod on the radial side of the tension rod relative to the central axis to be fixed to the tension rod; and The contact claw portion extends from the arm body to the outside of the tension rod and contacts the outer peripheral surface of the tension rod on the other side of the central axis in the radial direction.

8. The printer according to claim 7, wherein: A first inner insertion hole is formed through the first claw portion. The tension rod is provided with a first outer insertion hole at a position overlapping with the first inner insertion hole. The first claw portion and the tension rod are fixed by a first screw inserted into the first inner insertion hole and the first outer insertion hole.

9. The printer according to claim 7, wherein: When an axis extending from the one side to the other side in the radial direction of the tension rod and intersecting the central axis of the tension rod when viewed from the axial direction of the tension rod is taken as a reference axis, When viewed from the axial direction of the tension rod, the first claw portion is arranged on the reference axis. The contact claw portion includes a first contact claw portion and a second contact claw portion which are arranged at positions facing each other across the reference axis.

10. The printer according to claim 9, wherein: The width of the front end portion of each of the first contact claw portion and the second contact claw portion decreases toward the front end.

11. The printer according to claim 9 or 10, wherein: The fixing portion includes a second claw portion and a third claw portion extending from the arm body toward the inside of the tension rod and arranged at positions opposite to each other across the reference axis. A second inner insertion hole is formed through the second claw portion. A third inner insertion hole is provided through the third claw portion. The tension rod is provided with a second outer insertion hole at a position overlapping with the second inner insertion hole, and a third outer insertion hole at a position overlapping with the third inner insertion hole. The second claw portion and the tension rod are fixed by a second screw inserted into the second inner insertion hole and the second outer insertion hole. The third claw portion and the tension rod are fixed by a third screw inserted into the third inner insertion hole and the third outer insertion hole.

12. The printer according to claim 11, wherein: The first contact claw portion and the second contact claw portion are shorter than at least any one of the first claw portion, the second claw portion, and the third claw portion.

Images