JP7241150B2 - printer - Google Patents

Description

The present invention relates to printers.

For example, Patent Document 1 discloses a printer that winds a medium into a roll after printing. The above printer includes a printer body, a medium support section provided in the printer body for supporting a medium during printing, a winding section for winding the medium after printing, and a portion of the medium extending from the medium support section to the winding section. It is equipped with a tension bar that provides tension. The tension bar is supported by one end of a support arm, and the other end of the support arm is swingably supported by the printer body. In the above printer, the tension bar can apply tension to the medium by swinging downward under its own weight.

International Publication No. 2018/139263

By the way, the tension bar and the support arm are separate members and are assembled with each other. FIG. 17 is a cross-sectional view schematically showing a state in which the tension bar 151 and the left support arm 152 of the conventional printer 210 are assembled. As shown in FIG. 17, a tubular tension bar 151 is attached to a support arm 152 via an intermediate member 153 made of aluminum, for example.

When assembling the tension bar 151 to the support arm 152 , the intermediate member 153 is first fitted into the tension bar 151 and a sealant is applied between the inner peripheral surface of the tension bar 151 and the intermediate member 153 . Next, after leaving for a predetermined time (for example, 24 hours) until the sealing agent hardens, the tension bar 151 and the intermediate member 153 are fixed by tightening the two screws 191 from both upper and lower sides of the tension bar 151 . After that, the intermediate member 153 and the support arm 152 are overlapped and tightened with two screws 192 to fix the support arm 152 to the intermediate member 153 . As a result, the tension bar 151 and the support arm 152 are fixed via the intermediate member 153 .

As described above, conventionally, when the tension bar 151 and the support arm 152 are assembled, the intermediate member 153 is required, which increases the number of parts. Furthermore, conventionally, since a sealing agent is used, it takes time for the sealing agent to harden, and it takes time to assemble the tension bar 151 and the support arm 152 .

The present invention has been made in view of this point, and its object is to shorten the work time for assembling the tension bar and the support arm while reducing the number of parts required when assembling the tension bar and the support arm. is to provide a printer capable of

A printer according to the present invention includes a support base for supporting a medium during printing, a winding shaft for winding the medium after printing, and a tension bar for applying tension to a portion of the medium directed from the support base to the winding shaft. with the unit. The tension bar unit has a cylindrical tension bar and a pair of support arms provided at both ends of the tension bar for swingably supporting the tension bar. The support arm has an arm body that swingably supports the tension bar, and a fixing portion integrally formed with the arm body. The fixing portion is fitted into the inner peripheral surface of the tension bar and fixed to the tension bar.

According to the printer of the present invention, the support arm and the tension bar can be fixed by fitting the fixing portion of the support arm into the cylindrical tension bar. Therefore, the support arm and the tension bar can be fixed without using the conventional intermediate member 153 (see FIG. 17) and without using a sealing agent. Therefore, it is possible to shorten the work time for assembling the tension bar and the support arm while reducing the number of parts of the tension bar unit.

According to the present invention, it is possible to provide a printer capable of shortening the work time for assembling the tension bar and the support arm while reducing the number of parts required when assembling the tension bar and the support arm.

1 is a perspective view showing a printer according to a first embodiment; FIG. 2 is a right side view showing the printer according to the first embodiment; FIG. FIG. 4 is a perspective view showing a tension bar unit; FIG. 4 is a bottom view showing the tension bar and right support bar of the tension bar unit; FIG. 5 is a cross-sectional view of the tension bar unit along the VV cross section of FIG. 4; It is a perspective view showing a support arm. It is the figure which looked at the support arm from the tension bar and the opposite side. FIG. 4 is a plan view showing a support arm; It is a bottom view showing a support arm. It is a front view which shows a support arm. FIG. 11 is a perspective view showing a tension bar unit according to a second embodiment; FIG. 4 is a diagram showing the tension bar unit when viewed from the axial direction of the tension bar; It is a perspective view which shows a weight. 14 is an enlarged view of portion A of FIG. 13; FIG. FIG. 15(a) is a diagram showing the first groove of the weight, and is a bottom view of the weight. FIG. 15(b) is a diagram showing the second groove of the weight, and is a front view of the weight. FIG. 15(c) is a diagram showing the weight when viewed from the axial direction of the tension bar. FIG. 11 is a perspective view showing a tension bar and a weight of a tension bar unit according to another embodiment; FIG. 5 is a cross-sectional view schematically showing a state in which a tension bar and a left support arm of a conventional printer are assembled;

An embodiment of the present invention will be described below with reference to the drawings. It should be noted that, of course, the embodiments described herein are not intended to specifically limit the present invention. Further, members and portions having the same function are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted or simplified.

<First Embodiment>
FIG. 1 is a perspective view of a printer 10 according to this embodiment. 2 is a right side view of the printer 10. FIG. References F, Rr, L, R, U, and D in the drawings indicate the front, rear, left, right, top, and bottom of the printer 10, respectively. Symbols X, Y, and Z indicate the front-back direction, the left-right direction, and the up-down direction, respectively. However, these directions are merely directions determined for convenience of explanation, and do not limit the installation mode of the printer 10 in any way.

As shown in FIG. 1, the printer 10 is, for example, an inkjet printer. Printer 10 prints on medium 5 . The medium 5 is, for example, roll-shaped recording paper. The medium 5 is not limited to recording paper as long as it has a shape that can be wound around a winding shaft 41 of a winding unit 40, which will be described later. The medium 5 may be, for example, a sheet or film made of resin, fabric such as woven fabric or non-woven fabric, or other media.

As shown in FIG. 2, the printer 10 includes a printer main body 11 having a casing (not shown) extending in the horizontal direction Y, and a platen 12 provided on the printer main body 11 . Platen 12 is an example of the support base of the present invention. Platen 12 supports media 5 during printing. In this embodiment, the medium 5 is placed on the platen 12 . The platen 12 extends in the front-rear direction X and the left-right direction Y. As shown in FIG.

The printer 10 has guide rails 14 , a carriage 16 and an ink head 18 . The guide rail 14 is arranged above the platen 12 and extends in the horizontal direction Y although not shown. The carriage 16 is engaged with the guide rail 14 and is movable in the horizontal direction Y along the guide rail 14 .

The ink head 18 is provided on the carriage 16 and is movable in the horizontal direction Y together with the carriage 16 . The ink head 18 has a plurality of nozzles (not shown) that are open downward, and ejects ink from the nozzles. The ink head 18 ejects ink toward the medium 5 supported by the platen 12 .

The printer 10 includes a transport mechanism 20 that transports the medium 5 supported by the platen 12 in the front-rear direction X, and a head moving mechanism (not shown) that moves the carriage 16 and the ink head 18 in the left-right direction Y. . As shown in FIG. 2, the conveying mechanism 20 includes a grit roller 21 provided on the platen 12, a pinch roller 22 that pinches the medium 5 together with the grit roller 21, and a feed motor (not shown) connected to the grit roller 21. and When the feed motor drives and the grit roller 21 rotates, the medium 5 is conveyed in the front-rear direction X. As shown in FIG.

Although not shown, the head moving mechanism for moving the carriage 16 and the ink head 18 in the horizontal direction Y is wound around left and right pulleys provided around the left and right ends of the guide rail 14 and left and right pulleys. It has a belt on it 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 runs. As a result, the carriage 16 and the ink head 18 move in the horizontal direction Y. As shown in FIG.

As shown in FIG. 2, the printer 10 includes a feeding unit 30 that feeds the medium 5 to the platen 12. As shown in FIG. The supply unit 30 is arranged behind and below the platen 12 . The supply unit 30 has a pair of left and right support plates 32 and a pair of left and right supply shafts 31 extending in the horizontal direction Y from the support plates 32 toward the center of the printer 10 . 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 not shown, the pair of supply shafts 31 extends in the left-right direction Y so as to be separated from each other. A roll-shaped medium 5 before printing is attached to the pair of supply shafts 31 . When the medium 5 is transported forward by the transport mechanism 20 , the roll-shaped medium 5 attached to the pair of supply shafts 31 is sent out from the pair of supply shafts 31 toward the platen 12 .

As shown in FIG. 2, the printer 10 includes a winding unit 40 that winds the medium 5 supported by the platen 12 into a roll. The winding unit 40 is arranged below the platen 12 . As shown in FIG. 1 , the winding unit 40 includes a winding shaft 41 , a winding motor 42 that rotates the winding shaft 41 , and a pair of left and right support plates 44 that support the winding shaft 41 . have.

The take-up shaft 41 is formed in a cylindrical shape or columnar shape extending in the left-right direction Y. As shown in FIG. The medium 5 is wound around the winding shaft 41 . The pair of support plates 44 includes a left support plate 44L and a right support plate 44R. A pair of front and rear rails 45 extending in the left-right direction Y are bridged between the left support plate 44L and the right support plate 44R. there is 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 rail 45 in the longitudinal direction of the rail 45 (here, the horizontal direction Y). As a result, media 5 having different lengths in the longitudinal direction of the take-up shaft 41 (here, the horizontal direction Y) can be handled.

The winding motor 42 is connected to the winding shaft 41 and rotates the winding shaft 41 . The winding motor 42 is indirectly connected to the winding shaft 41 via a reduction gear (not shown). In this embodiment, the medium 5 printed on the platen 12 is transported forward. The take-up shaft 41 receives the driving force of the take-up motor 42 and rotates to wind the medium 5 printed on the platen 12 onto the peripheral surface of the take-up shaft 41 .

In this embodiment, the printer 10 has a tension bar unit 50 . A tension bar unit 50 applies tension to the portion of the medium 5 directed from the platen 12 toward the take-up shaft 41 . As a result, the medium 5 transported forward from the platen 12 is transported to the take-up shaft 41 in a stretched state. As shown in FIG. 2 , the tension bar unit 50 is arranged below the platen 12 . The tension bar unit 50 is provided in the printer main body 11 , and at least part of the tension bar unit 50 is arranged in front of the printer main body 11 .

Next, the configuration of the tension bar unit 50 will be described in detail. As shown in FIG. 1, the tension bar unit 50 includes a tension bar 51, a pair of support arms 52 that support the tension bar 51, and support members 55 that pivotably support the pair of support arms 52, respectively. have. The tension bar 51 extends in the left-right direction Y. As shown in FIG. In other words, the center axis A1 (see FIG. 8) of the tension bar 51 extends in the horizontal direction Y. As shown in FIG. The tension bar 51 is arranged parallel to the supply shaft 31 of the supply unit 30 and parallel to the winding shaft 41 of the winding unit 40 . The tension bar 51 is tubular (specifically, cylindrical).

As shown in FIG. 1, the pair of support arms 52 support the tension bar 51 and are rod-shaped. The pair of support arms 52 are arranged side by side. In the following description, the support arm 52 arranged on the left side is also referred to as a left support arm 52L. The support arm 52 arranged on the right side is also called a right support arm 52R. The left support arm 52L supports the left end of the tension bar 51, and the right support arm 52R supports the right end of the tension bar 51. As shown in FIG. The left support arm 52L and the right support arm 52R are fixed to the support member 55. As shown in FIG. 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 main body 11. As shown in FIG.

One end of the rod-shaped left support arm 52L supports the left end of the tension bar 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 a left support shaft 56L and indirectly supported by the printer body 11 via the left support shaft 56L and the left support member 55L.

Similarly, one end of the rod-shaped right support arm 52R supports the right end of the tension bar 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 FIG. 2) extending leftward from the right support member 55R. The other end of the right support arm 52R is connected to a right support shaft 56R and indirectly supported by the printer body 11 via the right support shaft 56R and the right support member 55R.

In this embodiment, the left support arm 52L and the right support arm 52R are configured to be swingable about the left support shaft 56L and the right support shaft 56R, respectively. Therefore, the tension bar 51 supported by the pair of support arms 52 is swung in a circular orbit about the left support shaft 56L and the right support shaft 56R. In this embodiment, the tension bar 51 swings forward by its own weight to push the medium 5 forward and downward, thereby applying tension to the medium 5 . Thus, in this embodiment, the pair of support arms 52 swingably support the tension bar 51 by swinging about the left support shaft 56L and the right support shaft 56R.

In this embodiment, the tension bar 51 is fitted and fixed to the pair of support arms 52 . Here, the configuration for fitting and fixing the left support arm 52L and the tension bar 51 and the configuration for fitting and fixing the right support arm 52R and the tension bar 51 are the same. Therefore, the configuration for fitting and fixing the one support arm 52 (here, the right support arm 52R) and the tension bar 51 will be described in detail below.

In this embodiment, the tension bar 51 and the support arm 52 are fixed to each other without any other member (for example, the intermediate member 153 shown in FIG. 17). Here, the tension bar 51 and the support arm 52 are fixed by fitting a part of the support arm 52 into the inner peripheral surface of the tension bar 51 .

In the following description, front, rear, top, and bottom of the tension bar 51 and the support arm 52 refer to the tension bar 51 and the support arm 52 when the longitudinal axis of the support arm 52 extends in the front-rear direction X. It means before, after, above and below 52 respectively. Further, as shown in FIG. 5, the axis extending in the vertical direction Z in the radial direction of the tension bar 51 is referred to as a reference axis A2. The reference axis A2 passes through the central axis A1 extending in the left-right direction Y of the tension bar 51 and intersects (specifically, is perpendicular to) the central axis A1.

As shown in FIG. 6 , the support arm 52 has an arm body 60 and a fixing portion 70 . As shown in FIG. 7, the arm body 60 is a plate-like member extending in the front-rear direction X. As shown in FIG. The arm body 60 extends in the front-rear direction X and the up-down direction Z. As shown in FIG. Here, as shown in FIG. 3, one end (here, the front end) of the arm body 60 supports the tension bar 51, and the other end (here, the rear end) of the arm body 60 supports the printer body 11. (See FIG. 2).

In this embodiment, as shown in FIG. 10, the arm body 60 is provided with an upper flange 68a extending from the upper end to the side opposite to the tension bar 51, and from the lower end to the side opposite to the tension bar 51. A lower flange 68b is provided which extends into. Further, the end of the upper flange 68a opposite to the tension bar 51 is provided with an upper vertical flange 69a extending downward from the opposite end. The end of the lower flange 68b opposite to the tension bar 51 is provided with a lower vertical flange 69b extending upward from the opposite end. The upper vertical flange 69a and the lower vertical flange 69b are separated vertically.

The fixing portion 70 fixes the tension bar 51 , and a part of the fixing portion 70 is fitted to the inner peripheral surface of the tension bar 51 . The fixed portion 70 is formed integrally with the arm body 60 . In this embodiment, the fixing portion 70 is formed at one end (here, the front end) of the arm body 60 . The fixing portion 70 has a first claw portion 61 , a second claw portion 62 , a third claw portion 63 and a contact claw portion 65 .

The first claw portion 61 extends from the arm body 60 into the tension bar 51 . The first claw portion 61 extends in the horizontal direction Y and is provided at the center of the arm body 60 in the vertical direction Z. As shown in FIG. As shown in FIG. 5 , when the tension bar 51 and the support arm 52 are fitted and fixed, at least a portion of the first claw portion 61 contacts the inner peripheral surface of the tension bar 51 . In this embodiment, as shown in FIG. 8, 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 one side (here, the front side) in the radial direction of the tension bar 51 with respect to the central axis A1 of the tension bar 51 . As shown in FIG. 5, when viewed from the direction of the central axis A1 of the tension bar 51, the first claw portion 61 overlaps the reference axis A2.

Note that 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 peripheral surface of the tension bar 51 is a flat surface. good. Here, the cross-sectional shape of the first claw portion 61 is square. 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-rear direction X. As shown in FIG. As shown in FIG. 10, the tip portion of the first claw portion 61 has a tapered shape, and the length (in other words, width) in the vertical direction Z decreases toward the tip. In this embodiment, the corners of the first claw portion 61 are chamfered.

In this embodiment, as shown in FIG. 10, the first claw portion 61 is provided with a first inner insertion hole 71 (in other words, formed). The first inner insertion hole 71 is bored in the tip portion of the first claw portion 61 and passes through the first claw portion 61 in the front-rear direction X. As shown in FIG. As shown in FIG. 5, a first outer insertion hole 81 is formed at a position of the tension bar 51 corresponding to the first inner insertion hole 71, that is, at a portion of the tension bar 51 overlapping the first inner insertion hole 71. there is The first outer insertion hole 81 is formed at the end and front portion of the tension bar 51 and penetrates in the front-rear direction X from the inner peripheral surface toward the outer peripheral surface. A first screw 91 is inserted into the first inner insertion hole 71 and the first outer insertion hole 81 . By inserting the first screw 91 in this way, the first screw 91 and the first inner insertion hole 71 and the first outer insertion hole 81 are screwed together. Therefore, the tension bar 51 and the first claw portion 61 are fixed to each other.

As shown in FIG. 10 , the second claw portion 62 and the third claw portion 63 extend from the arm body 60 into the tension bar 51 similarly to the first claw portion 61 . The second claw portion 62 and the third claw portion 63 extend in the left-right direction Y. As shown in FIG. As shown in FIG. 5 , when the tension bar 51 and the support arm 52 are fitted and fixed, at least a portion of the second claw portion 62 and at least a portion of the third claw portion 63 are positioned inside the tension bar 51 . come into contact with the surrounding surface. In this embodiment, as shown in FIGS. 8 and 9, the second claw portion 62 and the third claw portion 63 are provided at one end (here, the front end) of the arm body 60, and the first claw portion It is arranged behind 61. As shown in FIG. 10, the second claw portion 62 is arranged above the first claw portion 61, and the third claw portion 63 is arranged below the first claw portion 62 and the second claw portion 63. ing. As shown in FIG. 5, the second claw portion 62 and the third claw portion 63 are arranged at the same position in the front-rear direction X and face each other across the reference axis A2. Further, when viewed from the direction of the central axis A1 of the tension bar 51, the second claw portion 62 and the third claw portion 63 face each other with the central axis A1 interposed therebetween.

The shape and size of the second claw portion 62 and the third claw portion 63 are not particularly limited. In this embodiment, as shown in FIG. 10, the second claw portion 62 and the third claw portion 63 have the same shape and size. Here, as shown in FIG. 5 , the surfaces of the second claw portion 62 and the third claw portion 63 that face the tension bar 51 are flat surfaces, but the surfaces that face the tension bar 51 are flat surfaces. It may have a shape. The cross-sectional shape of each of the second claw portion 62 and the third claw portion 63 is rectangular like the first claw portion 61 . Specifically, the cross-sectional shape of each of the second claw portion 62 and the third claw portion 63 is a rectangular shape that is longer in the front-rear direction X than in the up-down direction Z. As shown in FIG. Further, as shown in FIGS. 8 and 9, the tip portions of the second claw portion 62 and the third claw portion 63 each have a tapered shape, and the length in the front-rear direction X ( In other words, width) is short. Corners of the second claw portion 62 and the third claw portion 63 are chamfered.

In this embodiment, the length L2 of the second claw portion 62 in the left-right direction Y and the length L3 of the third claw portion 63 in the left-right direction Y are the same. Furthermore, the second claw portion 62 and the third claw portion 63 have the same lengths L1, L2, and L3 in the horizontal direction Y as the first claw portion 61, respectively. However, the first claw portion 61, the second claw portion 62, and the third claw portion 63 may have different lengths L1, L2, and L3 in the horizontal direction Y.

In the present embodiment, as shown in FIGS. 8 and 9 , the second claw portion 62 is provided with a second inner insertion hole 72 (in other words, formed), and the third claw portion 63 is provided with a third inner insertion hole 72 . An insertion hole 73 is drilled. The second inner insertion hole 72 and the third inner insertion hole 73 are bored in the distal end portions of the second claw portion 62 and the third claw portion 63, respectively, so that the second claw portion 62 and the third claw portion 63 can be moved up and down. It penetrates in direction Z. In this 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 horizontal direction Y, but are arranged at different positions in the horizontal direction Y. may be placed.

As shown in FIG. 5 , a second outer insertion hole 82 is formed in a portion of the tension bar 51 that is positioned corresponding to the second inner insertion hole 72 and overlaps the second inner insertion hole 72 . ing. A third outer insertion hole 83 is formed at a position of the tension bar 51 corresponding to the third inner insertion hole 73 and overlapping the third inner insertion hole 73 . The second outer insertion hole 82 is formed at the end and upper portion of the tension bar 51 and penetrates in the vertical direction Z from the inner peripheral surface toward the outer peripheral surface. The third outer insertion hole 83 is formed at the end portion and lower portion of the tension bar 51 and penetrates in the vertical direction Z from the inner peripheral surface toward the outer peripheral surface. Here, the second outer insertion hole 82 and the third outer insertion hole 83 face each other with the central axis A1 (in other words, the reference axis A2) of the tension bar 51 interposed therebetween. The second outer insertion hole 82 and the third outer insertion hole 83 are long holes elongated in the front-rear direction X, respectively. In this 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 at different positions in the left-right direction Y. may be placed.

In this embodiment, the second screw 92 is inserted into the second inner insertion hole 72 and the second outer insertion hole 82 . The second screw 92 and the second inner insertion hole 72 are screwed together by inserting the second screw 92 . As a result, the tension bar 51 and the second claw portion 62 are fixed. Similarly, a 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 and the third inner insertion hole 73 are screwed together. As a result, the tension bar 51 and the third claw portion 63 are fixed.

As shown in FIG. 6 , the contact claw portion 65 positions the tension bar 51 with respect to the support arm 52 by abutting the end portion of the tension bar 51 . As shown in FIG. 3 , the contact claw portion 65 extends from the arm body 60 toward the outside of the tension bar 51 . Here, as shown in FIG. 5, the contact claw portion 65 is arranged on the other side (here, the rear side) in the radial direction of the tension bar 51 with respect to the central axis A1 of the tension bar 51. A front end 65 a of 65 contacts the outer peripheral surface of tension bar 51 .

In this embodiment, as shown in FIG. 6, two contact claw portions 65 are provided on the arm body 60, and the two contact claw portions 65 are arranged side by side in the vertical direction Z. As shown in FIG. Hereinafter, the upper contact claw portion 65 is referred to as a first contact claw portion 66 and the lower contact claw portion 65 is referred to as a second contact claw portion 67 . As shown in FIG. 5, the first contact claw portion 66 and the second contact claw portion 67 are arranged at positions facing each other across the reference axis A2. The first contact claw portion 66 and the second contact claw portion 67 are line-symmetrical about the reference axis A2. The distance to A2 is the same. The first contact claw portion 66 and the second contact claw portion 67 are arranged at the same position in the front-rear direction X. As shown in FIG. The first contact claw portion 66 and the second contact claw portion 67 are arranged behind the first claw portion 61 to the third claw portion 63, respectively. The first contact claw portion 66 is arranged at the same position in the vertical direction Z as the second claw portion 62 . The second contact claw portion 67 is arranged at the same position in the vertical direction Z as the third claw portion 63 .

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 this embodiment, the cross-sectional shape of each of the first contact claw portion 66 and the second contact claw portion 67 is a quadrangular shape, and more specifically, a rectangular shape that is longer in the front-rear direction X than in the up-down direction Z. As shown in FIGS. 8 and 9, the tip of each of the first contact claw portion 66 and the second contact claw portion 67 has a tapered shape, and the length in the front-rear direction X increases toward the tip. length (in other words, width) is short. The corners of the first contact claw portion 66 and the second contact claw portion 67 are chamfered. In the present embodiment, the lengths L4 and L5 in the left-right direction Y of the first contact claw portion 66 and the second contact claw portion 67 are equal to the lengths L4 and L5 of the left-right direction Y of the first claw portion 61 to the third claw portion 63, respectively. Shorter than the lengths L1, L2, L3.

In this embodiment, the support arm 52 is made of metal. Here, the arm body 60 and the fixed 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 , are integrally formed, but they may be separate members and fixed to each other by welding or the like. In this embodiment, the support arm 52 is formed by pressing and cutting a single sheet metal, and the arm body 60, the first claw portion 61, the second claw portion 62, and the third claw portion are formed from the single sheet metal. 63, a first contact claw portion 66 and a second contact claw portion 67 are produced.

In this embodiment, as shown in FIG. 7, one end portion (here, the front end portion) of the arm body 60 of the support arm 52 is provided with a rectangular first hole 60a, a second hole 60b, a third hole 60c, and a third hole 60c. Four holes 60d are formed. Here, the second claw portion 62 is formed by the portion of the sheet metal left uncut when forming the first hole 60a. Similarly, the third claw portion 63, the first contact claw portion 66, and the second contact claw portion 67 are formed by the sheet metal portions left uncut when forming the second hole 60b, the third hole 60c, and the fourth hole 60d. formed respectively.

In this embodiment, 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 second hole 60b. 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 four holes 60d. The arm body 60 is reinforced by the first reinforcing portion 60e to the fourth reinforcing portion 60h.

In this embodiment, the fitting and fixing of the tension bar 51 and the support arm 52 are performed in the following procedure. As shown in FIG. 5 , first, the fixed portion of the support arm 52 is attached to the tension bar 51 so 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 bar 51 . A part of 70 (specifically, the first claw portion 61, the second claw portion 62 and the third claw portion 63) is fitted. At this time, a gap (not shown) is formed between the inner peripheral surface of the tension bar 51 and the first claw portion 61 of the support arm 52, and the inner peripheral surface of the tension bar 51 and the first claw portion 61 are separated from each other. away. Here, the front ends 65 a of the first contact claw portion 66 and the second contact claw portion 67 of the support arm 52 come into contact with the outer peripheral surface of the tension bar 51 . This makes it possible to match the position of the tension bar 51 with respect to the support arm 52 to some extent.

When the first claw portion 61 to the third claw portion 63 are inserted into the tension bar 51 until the tension bar 51 hits the arm body 60, the first inner insertion hole 71 drilled in the first claw portion 61; It overlaps with the first outer insertion hole 81 drilled in the tension bar 51 . Therefore, next, the first screw 91 is inserted into the first inner insertion hole 71 and the first outer insertion hole 81 from the outside of the tension bar 51 and tightened. As a result, the first claw portion 61 is drawn toward the inner peripheral surface of the tension bar 51 (the upper side in FIG. 5), and the gap between the inner peripheral surface of the tension bar 51 and the first claw portion 61 is narrowed. , a portion of the first claw portion 61 (here, an edge portion) contacts the inner peripheral surface of the tension bar 51 . At this time, as the first claw portion 61 is drawn toward the inner peripheral surface of the tension bar 51 , the first contact claw portion 66 integrally formed with the arm body 60 and the second contact claw portion 66 are formed integrally with the arm main body 60 , similarly to the first claw portion 61 . The contact claw portion 67 is drawn toward the outer peripheral surface of the tension bar 51 (upper side in FIG. 5). Therefore, the outer peripheral surface of the tension bar 51 is pressed against the first contact claw portion 66 and the second contact claw portion 67 . As a result, the tension bar 51 is sandwiched between the first screw 91 inserted into the first inner insertion hole 71 of the first claw portion 61 and the first contact claw portion 66 and the second contact claw portion 67 . Therefore, the position of the tension bar 51 with respect to the support arm 52 is fixed.

In this 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 bar 51, the second inner insertion of the second claw portion 62 The hole 72 and the second outer insertion hole 82 of the tension bar 51 overlap, and the third inner insertion hole 73 of the third claw portion 63 and the third outer insertion hole 83 of the tension bar 51 overlap. Next, the second screw 92 is inserted into the second inner insertion hole 72 and the second outer insertion hole 82, the third screw 93 is inserted into the third inner insertion hole 73 and the third outer insertion hole 83, and the The second screw 92 and the third screw 93 are tightened. As a result, the second claw portion 62 and the third claw portion 63 are fixed to the tension bar 51 , and the tension bar 51 can be fixed to the support arm 52 more firmly.

The above is performed for the left support arm 52L and the right support arm 52R, and the left support arm 52L and the right support arm 52R are fitted into the tension bar 51 and fixed. After that, as shown in FIG. 1, the left support arm 52L and the right support arm 52R are attached to the printer main body 11 so as to be swingable relative to the printer main body 11. As shown in FIG.

As described above, in this embodiment, as shown in FIG. 2, the printer 10 includes the platen 12 that supports the medium 5 during printing, the winding shaft 41 that winds up the medium 5 after printing, and the winding shaft 41 from the platen 12 . and a tension bar unit 50 for tensioning the portion of the medium 5 directed toward the. As shown in FIG. 1, the tension bar unit 50 has a cylindrical tension bar 51 and a pair of support arms 52 provided at both ends of the tension bar 51 for swingably supporting the tension bar 51. there is As shown in FIG. 3 , the support arm 52 has an arm body 60 that swingably supports the tension bar 51 and a fixing portion 70 integrally formed with the arm body 60 . The fixing portion 70 is fitted into the inner peripheral surface of the tension bar 51 and fixed to the tension bar 51 . Accordingly, by fitting the fixing portion 70 of the support arm 52 into the cylindrical tension bar 51, the support arm 52 and the tension bar 51 can be fixed. Therefore, the support arm 52 and the tension bar 51 can be fixed without using the conventional intermediate member 153 (see FIG. 17) and without using a sealing agent. Therefore, it is possible to shorten the working time for assembling the tension bar 51 and the support arm 52 while reducing the number of parts of the tension bar unit 50 .

In this embodiment, as shown in FIG. 6 , the fixing portion 70 has a first claw portion 61 and a contact claw portion 65 . As shown in FIG. 3, the first claw portion 61 extends from the arm body 60 into the tension bar 51, and as shown in FIG. The front side) is fitted into the inner peripheral surface of the tension bar 51 and fixed to the tension bar 51 . The contact claw portion 65 extends from the arm body 60 to the outside of the tension bar 51 and contacts the outer peripheral surface of the tension bar 51 on the other side (here, the rear side) of the center axis A1 in the radial direction. Thus, by bringing the tension bar 51 into contact with the contact claw portion 65 , the first claw portion 61 is brought into contact with the inner peripheral surface of the tension bar 51 and the contact claw portion 65 is brought into contact with the outer peripheral surface of the tension bar 51 . can be done. Therefore, it is easy to position the tension bar 51 with respect to the support arm 52 with the first claw portion 61 and the contact claw portion 65 .

In this embodiment, the first claw portion 61 is provided with a first inner insertion hole 71 . A first outer insertion hole 81 is formed in the tension bar 51 at a position overlapping with the first inner insertion hole 71 . The first claw portion 61 and the tension bar 51 are fixed by a first screw 91 inserted into the first inner insertion hole 71 and the second outer insertion hole 81 . By tightening the first screw 91 in this manner, the first claw portion 61 and the tension bar 51 can be fixed, and the tension bar 51 can be pressed against the contact claw portion 65 . Therefore, it is possible to fix the tension bar 51 and the support arm 52 while determining the position of the tension bar 51 with respect to the support arm 52 .

In this embodiment, when viewed from the axial direction of the tension bar 51, the reference axis A2 extends from one side (here, the front side) in the radial direction of the tension bar 51 to the other side (here, the rear side) in the radial direction. 51 is an axis that intersects with the central axis A1. The first claw portion 61 is arranged on the reference axis A2 when viewed from the axial direction of the tension bar 51 . The contact claw portion 65 has a first contact claw portion 66 and a second contact claw portion 67 that are arranged at positions facing each other across the reference axis A2. As a result, the tension bar 51 is positioned with respect to the support arm 52 so that the center of the tension bar 51 in the radial direction is arranged on the reference axis A2 by pressing the tension bar 51 against the contact claw portion 65. be able to.

In the present embodiment, as shown in FIGS. 8 and 9, the tip of each of the first contact claw portion 66 and the second contact claw portion 67 has a width (here, length in the front-rear direction X) toward the tip. ) is small. As a result, when the first to third claw portions 61 to 63 of the support arm 52 are inserted into the tension bar 51, the respective tip portions of the first contact claw portion 66 and the second contact claw portion 67 are attached to the tension bar. 51, the first to third claw portions 61 to 63 can be inserted into the tension bar 51 while being guided by the tip.

In this embodiment, as shown in FIGS. 5 and 10, the fixing portion 70 extends from the arm body 60 toward the inside of the tension bar 51, and is arranged at positions facing each other across the reference axis A2. 62 and a third claw portion 63 . As shown in FIG. 5 , 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 bar 51 has a second outer insertion hole 82 at a position overlapping with the second inner insertion hole 72 and a third outer insertion hole 83 at a position overlapping with the third inner insertion hole 73. there is 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 bar 51 can be fixed. Further, 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 bar 51 can be fixed. Therefore, the tension bar 51 and one support arm 52 can be more firmly fixed at the three points of the first screw 91 to the third screw 93 .

In this embodiment, as shown in FIGS. 8 and 9, the first contact claw portion 66 and the second contact claw portion 67 are at least one of the first claw portion 61, the second claw portion 62 and the third claw portion 63. The length in the horizontal direction Y is shorter than . As a result, when the first to third claw portions 61 to 63 are inserted into the tension bar 51, before the first contact claw portion 66 and the second contact claw portion 67 come into contact with the tension bar 51, the first Insertion of the claw portion 61 to the third claw portion 63 can be started. Therefore, when inserting the first claw portion 61 to the third claw portion 63 into the tension bar 51, the insertion can be started without the first contact claw portion 66 and the second contact claw portion 67 contacting the tension bar 51. can be done.

The printer 10 according to the first embodiment has been described above. The printer proposed here is not limited to the printer 10 according to the first embodiment, and can be implemented in various other forms. Next, another embodiment will be briefly described. In addition, in the following description, the same reference numerals are used for the same configurations as those already described, and the description thereof will be omitted.

<Second embodiment>
Next, a printer 10A according to the second embodiment will be described. FIG. 11 is a perspective view showing the tension bar unit 50A of the printer 10A according to this embodiment. FIG. 12 is a diagram showing the tension bar unit 50A when viewed from the axial direction of the tension bar 51. FIG. As shown in FIG. 11, the printer 10A according to this embodiment includes a tension bar unit 50A. The tension bar unit 50A has a tension bar 51 and a pair of support arms 52 that support the tension bar 51, like the tension bar unit 50 (see FIG. 3) of the first embodiment. In the tension bar unit 50A, the tension bar 51 is lowered by its own weight, so that tension can be applied to the portion of the medium 5 directed from the platen 12 toward the take-up shaft 41 as shown in FIG.

By the way, in this embodiment, there are various types of media 5 printed by the printer 10A, such as media with different thicknesses and materials with different materials. Depending on the type of medium 5, the tension required to properly wind the medium 5 on the winding shaft 41, which is applied by the tension bar 51, may vary. In order to change the size applied to the medium 5, for example, the current tension bar 51 may be replaced with a tension bar 51 having a different weight. However, it is not easy to replace the tension bar 51 itself.

Therefore, in this embodiment, the tension bar unit 50A has a weight 110 as shown in FIG. A weight 110 is added to the tension bar unit 50A, and the magnitude of the tension applied to the medium 5 by the tension bar 51 is adjusted according to the weight of the weight 110. - 特許庁Here, for example, it is conceivable to attach the weight 110 to the support arm 52 of the tension bar unit 50A. However, the support arm 52 is relatively small, eg, narrow in width. Therefore, since the space of the support arm 52 for attaching the weight 110 is limited, it is difficult to attach the relatively heavy weight 110 to the support arm 52 .

Therefore, in the present embodiment, as shown in FIG. 11, the weight 110 is housed inside the tension bar 51 . The weight 110 is arranged inside the tension bar 51 and is removable from the tension bar 51 . In this embodiment, the weight 110 extends along the axial direction of the tension bar 51 (here, the horizontal direction Y). FIG. 13 is a perspective view showing the weight 110. FIG. 14 is an enlarged view of portion A of FIG. 13. FIG. As shown in FIG. 13, the weight 110 is plate-shaped and formed by bending a plate-shaped member. The length of the weight 110 in the left-right direction Y is, for example, the length of the tension bar 51 in the left-right direction Y, that is, the length in the axial direction. is almost the same as

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

The second plate-like portion 112 is a plate-like portion that extends in the vertical direction Z when viewed from the axial direction of the tension bar 51, as shown in FIG. Here, as shown in FIG. 13, the second plate-shaped portion 112 extends in the horizontal direction Y and the vertical direction Z. As shown in FIG. The second plate-shaped portion 112 is longer in the horizontal direction Y than in the vertical direction Z. As shown in FIG. As shown in FIG. 15C , the second plate-shaped portion 112 is arranged between the pair of first plate-shaped portions 111 and is continuous with the pair of first plate-shaped portions 111 . In this embodiment, one end (here, the lower end) of the second plate-shaped portion 112 is connected to one end (here, the rear end) of the lower first plate-shaped portion 111 . The other end (here, the upper end) of the second plate-shaped portion 112 is connected to one end (here, the rear end) of the upper first plate-shaped portion 111 .

A material forming the weight 110 is not particularly limited. Here, the weight 110 is made of metal, for example.

In this embodiment, the weight 110 is supported by the support arm 52 inside the tension bar 51 . Here, the left end of weight 110 is supported by left support arm 52L, and the right end of weight 110 is supported by right support arm 52R. Note that the configuration of the support arm 52 that supports the weight 110 is not particularly limited.

In this embodiment, as shown in FIG. 12 , the arm body 60 of the support arm 52 is provided with a support portion 160 that supports the weight 110 . 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 has a rectangular shape, but the shape of the hole 170 is not particularly limited.

In the present embodiment, a first rod-shaped portion 171 is bridged over both upper and lower ends of the hole 170 so as to straddle the hole 170 . The first bar-shaped portion 171 extends in the up-down direction Z. As shown in FIG. A second rod-shaped portion 172 is bridged across the front and rear ends of the hole 170 so as to straddle the hole 170 . Here, the second rod-shaped portion 172 and the first rod-shaped portion 171 intersect (orthogonal here), and the intersecting portion is integrally formed. The hole 170 is partitioned by a first rod-shaped portion 171 and a second rod-shaped portion 172 into four first holes 60a, a second hole 60b, a third hole 60c and a fourth hole 60d.

In this embodiment, the end of the weight 110 is supported by the support portion 160 of the support arm 52 . Specifically, the left end of the weight 110 is supported by the support portion 160 of the left support arm 52L, and the right end of the weight 110 is supported by the support portion 160 of the right support arm 52R. Here, as shown in FIG. 14, first grooves 181 are formed at the ends (here, both left and right ends) of the pair of first plate-shaped portions 111 of the weight 110 . Here, as shown in FIG. 15(a), two projections 181a and 181b are formed on the end of the first plate-shaped portion 111 so as to be aligned in the front-rear direction, and between the projections 181a and 181b , a first groove 181 is formed. The width of the first groove 181 increases toward the end of the first plate-shaped portion 111 . As shown in FIG. 11 , the first rod-shaped portion 171 of the support arm 52 is fitted into the first grooves 181 of the pair of first plate-shaped portions 111 .

As shown in FIG. 14 , second grooves 182 are formed at the ends (here, both left and right ends) of the second plate-shaped portion 112 of the weight 110 . Although FIG. 13 shows the second groove 182 formed at the right end of the second plate-shaped portion 112 , the second groove 182 is also formed at the left end of the second plate-shaped portion 112 . As shown in FIG. 15B, the width of the second groove 182 increases toward the end of the second plate-shaped portion 112 . In this embodiment, as shown in FIGS. 15A and 15B, the width of the second groove 182 is smaller than the width of the first groove 181, but larger than the width of the first groove 181. , or may be the same as the width of the first groove 181 . As shown in FIG. 11 , the second rod-shaped portion 172 of the support arm 52 is fitted into the second groove 182 .

In this embodiment, the first rod-shaped portion 171 of the left support arm 52L is fitted into the first groove 181 formed at the left end of the pair of first plate-shaped portions 111 of the weight 110, and the second rod-shaped portion 171 of the left support arm 52L is fitted. The bar-shaped portion 172 is fitted into the second groove 182 formed at the left end of the second plate-shaped portion 112 of the weight 110 . This allows the left support arm 52L to support the weight 110. As shown in FIG. Similarly, the first rod-shaped portion 171 of the right support arm 52R is fitted into the first groove 181 formed at the right end of the pair of first plate-shaped portions 111 of the weight 110, and the second rod-shaped portion of the right support arm 52R is fitted. 172 is fitted into the second groove 182 formed at the right end of the second plate-shaped portion 112 of the weight 110 . This allows the right support arm 52R to support the weight 110. As shown in FIG.

In this embodiment, a plurality of weights 110 with different weights are prepared. The plurality of weights 110 differ in weight by, for example, varying the plate thickness of the first plate-like portion 111 or the second plate-like portion 112 . When the weight of the weight 110 is varied, the thickness of the entire first plate-shaped portion 111 or the second plate-shaped portion 112 may be varied, or a portion thereof (for example, only the left and right ends or the central portion) may be varied. only) may have different plate thicknesses. For example, by reducing the plate thickness of the weight 110, a light weight 110 can be prepared, and by increasing the plate thickness of the weight 110, a heavy weight 110 can be prepared.

The degree of elongation of the medium 5 differs depending on the type of the medium 5 and the thickness characteristics of the medium 5 . Therefore, the tension applied to the medium 5 by the tension bar 51 is determined in consideration of the characteristics of the medium 5 . For example, when winding a relatively thin medium 5, a relatively large tension is required. In this case, the heavy weight 110 is housed inside the tension bar 51 . As a result, the weight of the tension bar 51 and the heavy weight 110 can increase the downward force of the tension bar 51 . Therefore, a large tension can be applied to the portion of the medium 5 directed from the platen 12 toward the take-up shaft 41 . On the other hand, when winding the medium 5 with a relatively large thickness, a relatively small tension may be applied. In this case, the heavy weight 110 is replaced with the light weight 110 and the light weight 110 is housed inside the tension bar 51 . As a result, the weight of the tension bar 51 and the light weight 110 can weaken the downward force of the tension bar 51 . Therefore, a small tension can be applied to the portion of the medium 5 directed from the platen 12 toward the take-up shaft 41 .

As described above, in the present embodiment, as shown in FIG. 11, the tension bar unit 50A is arranged inside the tension bar 51 and has the weight 110 that can be removed from the tension bar 51 . Therefore, when it is desired to change the tension applied to the medium 5 by the tension bar 51, the weight of the weight 110 arranged inside the tension bar 51 can be changed. Therefore, by changing the weight of the weight 110 according to the type of the medium 5, the tension applied to the medium 5 can be easily changed to an appropriate one.

Further, in this embodiment, a weight 110 is arranged inside the tension bar 51 . Therefore, compared to the case where the weight 110 is attached to the support arm 52, for example, the weight 110 is positioned farther from the fulcrum (here, the left support shaft 56L and the right support shaft 56R (see FIG. 2)) at which the tension bar 51 rotates. A weight 110 can be placed. Therefore, the weight 110 can be arranged at an effective position.

In this embodiment, the weight 110 extends in the tension bar 51 along the axial direction of the tension bar 51 (here, the horizontal direction Y). As a result, the weight of the weight 110 can be uniformly applied to the tension bar 51 in the horizontal direction Y. As shown in FIG. Therefore, tension can be uniformly applied to the medium 5 in the horizontal direction Y. As shown in FIG.

In this embodiment, as shown in FIG. 13, the weight 110 is formed in a bent plate shape. More specifically, the cross-sectional shape of weight 110 is U-shaped. The rigidity of the weight 110 can be increased by bending the plate-shaped member to form a U-shaped cross section. By increasing the rigidity of the weight 110 , even if the weight 110 extends in the horizontal direction Y, the weight 110 can be made difficult to bend within the tension bar 51 .

In this embodiment, the weight 110 is supported by the support arm 52, as shown in FIG. As a result, the weights 110 can be assembled at the left and right ends of the tension bar 51, which facilitates assembly.

In this embodiment, a hole 170 is formed in the arm body 60 of the support arm 52 . The support arm 52 has a first rod-shaped portion 171 extending in a predetermined first direction (vertical direction Z here) and bridging both ends of the hole 170 in the vertical direction Z. As shown in FIG. The weight 110 has a first plate-like portion 111 extending in a second direction (here, the front-rear direction X) that intersects the first direction when viewed from the axial direction of the tension bar 51 . A first groove 181 into which the first bar-shaped portion 171 is fitted is formed at the end of the first plate-shaped portion 111 . Since the first bar-shaped portion 171 of the support arm 52 is fitted in the first groove 181 of the first plate-shaped portion 111 of the weight 110 in this manner, the weight 110 is difficult to move in the front-rear direction X with respect to the tension bar 51 . can do. Therefore, rattling of the weight 110 with respect to the tension bar 51 in the front-rear direction X can be suppressed.

In this embodiment, the support arm 52 has a second rod-shaped portion 172 that extends in the front-rear direction X and bridges both ends of the hole 170 in the front-rear direction X. As shown in FIG. The weight 110 has a second plate-like portion 112 extending in the vertical direction Z when viewed from the axial direction of the tension bar 51 . A second groove 182 into which the second bar-shaped portion 172 is fitted is formed at the end of the second plate-shaped portion 112 . Since the second rod-shaped portion 172 of the support arm 52 fits into the second groove 182 of the second plate-shaped portion 112 of the weight 110 in this way, the weight 110 is difficult to move in the vertical direction Z with respect to the tension bar 51. can do. Therefore, rattling in the vertical direction Z of the weight 110 with respect to the tension bar 51 can be suppressed.

In this embodiment, the weight 110 extends in the axial direction of the tension bar 51 and covers the entire axial direction of the tension bar 51 . However, as shown in FIG. 16, the weight 110A may be arranged inside the end of the tension bar 51. FIG. The weight 110A is fitted in the tension bar 51, for example, and may have a cylindrical shape with a length in the left-right direction Y that is shorter than the length in the left-right direction Y of the tension bar 51.

Also, the number of weights 110A is not particularly limited. For example, one weight 110</b>A may be arranged inside the left end of the tension bar 51 and one inside the right end of the tension bar 51 .

Further, although the weight 110 is made of metal in the present embodiment, the weight 110 is not limited to metal, and may be made of resin. Alternatively, the weight 110 may be formed by injecting, for example, a liquid resin material into the tension bar 51 and hardening it.

5 medium 10, 10A printer 12 platen (support base)
41 winding shaft 50, 50A tension bar unit 51 tension bar 52 support arm 60 arm main body 61 first claw portion 62 second claw portion 63 third claw portion 65 contact claw portion 66 first contact claw portion 67 second contact claw portion 110 weight 111 first plate-shaped portion 112 second plate-shaped portion 170 hole 171 first rod-shaped portion 172 second rod-shaped portion 181 first groove 182 second groove

Claims (14)

a support that supports the medium during printing;
a winding shaft for winding the printed medium;
a tension bar unit that tensions a portion of the media from the support base toward the take-up axis;
with
The tension bar unit is
a cylindrical tension bar,
a pair of support arms provided at both ends of the tension bar for swingably supporting the tension bar;
a weight disposed within the tension bar;
has
The support arm is
an arm body that swingably supports the tension bar;
a fixing portion integrally formed with the arm body;
has
The printer according to claim 1, wherein the fixed portion is fixed to the tension bar by being fitted into an inner peripheral surface of the tension bar. 2. The printer of claim 1, wherein said weight is removable with respect to said tension bar. 3. The printer according to claim 1 , wherein said weight extends along the axial direction of said tension bar within said tension bar. 4. A printer according to claim 3, wherein said weight is a bent plate. 5. The printer according to claim 4, wherein the cross-sectional shape of said weight is U-shaped. A printer according to any one of claims 1 to 5, wherein said weight is supported on said support arm. A hole is formed in the arm body of the support arm,
The support arm extends in a predetermined first direction and has a first rod-shaped portion that bridges both ends of the hole in the first direction,
The weight has a first plate-shaped portion extending in a second direction that intersects with the first direction when viewed from the axial direction of the tension bar,
7. The printer according to claim 6, wherein a first groove into which said first rod-shaped portion is fitted is formed at an end of said first plate-shaped portion. The support arm has a second rod-shaped portion extending in the second direction and bridging both ends of the hole in the second direction,
The weight has a second plate-shaped portion extending in the first direction when viewed from the axial direction of the tension bar,
8. The printer according to claim 7, wherein a second groove into which said second bar-shaped portion is fitted is formed at an end of said second plate-shaped portion. a support that supports the medium during printing;
a winding shaft for winding the printed medium;
a tension bar unit that tensions a portion of the media from the support base toward the take-up axis;
with
The tension bar unit is
a cylindrical tension bar,
a pair of support arms provided at both ends of the tension bar for swingably supporting the tension bar;
has
The support arm is
an arm body that swingably supports the tension bar;
a fixing portion integrally formed with the arm body;
has
The fixing portion is fixed to the tension bar by being fitted into the inner peripheral surface of the tension bar,
The fixed part is
a first pawl extending from the arm body toward the inside of the tension bar, fitted into the inner peripheral surface of the tension bar on one side in the radial direction of the central axis of the tension bar, and fixed to the tension bar; ,
a contact claw extending from the arm body to the outside of the tension bar and contacting an outer peripheral surface on the other side in the radial direction of the center axis of the tension bar;
a printer . A first inner insertion hole is formed in the first claw portion,
The tension bar is provided with a first outer insertion hole at a position overlapping with the first inner insertion hole,
10. The printer according to claim 9, wherein said first claw portion and said tension bar are fixed by a first screw inserted into said first inner insertion hole and said first outer insertion hole. When an axis extending from the one side in the radial direction of the tension bar to the other side in the radial direction of the tension bar and intersecting the central axis of the tension bar when viewed from the axial direction of the tension bar is taken as a reference axis,
The first claw portion is arranged on the reference axis when viewed from the axial direction of the tension bar,
11. The printer according to claim 9, wherein said contact claw portion has a first contact claw portion and a second contact claw portion arranged at positions facing each other with said reference axis interposed therebetween. 12. The printer according to claim 11, wherein the tip portions of the first contact claw portion and the second contact claw portion have widths that decrease toward the tips. The fixing portion extends from the arm body toward the inside of the tension bar and has a second claw portion and a third claw portion that are arranged at positions facing each other with the reference shaft interposed therebetween,
A second inner insertion hole is formed in the second claw portion,
A third inner insertion hole is formed in the third claw portion,
The tension bar 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 bar are fixed by a second screw inserted into the second inner insertion hole and the second outer insertion hole,
13. The printer according to claim 11, wherein said third claw portion and said tension bar are fixed by a third screw inserted into said third inner insertion hole and said third outer insertion hole. 14. A printer according to claim 13, wherein said first contact claw portion and said second contact claw portion are shorter than at least one of said first claw portion, said second claw portion and said third claw portion.

Images