Printing apparatus

Abstract

The invention provides a printing apparatus that suppresses the occurrence of variations in driving forces acting on a first leg part and a second leg part. The printing apparatus (1) includes a moving mechanism (70) configured to be movable in a front-back direction with respect to a medium support portion (30) that supports a printing medium (M), and a driving mechanism (50) that moves the moving mechanism in the front-back direction. The moving mechanism includes: a first guide shaft (51A); a second guide shaft (51B); a first leg part (73A) movably supported by the first guide shaft; and a second leg part (73B) movably supported by the second guide shaft, the driving mechanism having a leg driving motor (61) and a transmission structure (60), the transmission structure transmitting a driving force generated by the leg driving motor to the first leg part and the second leg part, the leg driving motor being disposed between the first guide shaft and the second guide shaft in the left-right direction, and the transmission structure transmitting the driving force generated by the leg driving motor to the first leg part and the second leg part. The first leg part and the second leg part are driven in the front-back direction.

Description

Technical Field

[0001] The invention relates to a printing device. Background Art

[0002] Patent Document 1 discloses a printing device that moves a gantry that holds a recording head.

[0003] In order to stabilize the movement of the moving part in the printing device disclosed in Patent Document 1, it is preferable to apply driving force to two or more locations of the moving part. However, when applying driving force to two or more locations of the moving part, there is a problem that the driving force applied to the moving part varies.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2021-66045 Summary of the invention

[0005] One embodiment of the present disclosure is a printing device, which includes: a medium support portion that supports a printing medium; a printing portion that prints on the printing medium; a moving mechanism that is configured to support the printing portion and is movable relative to the medium support portion in a first direction; and a driving mechanism that moves the moving mechanism in the first direction, the moving mechanism having: a first guide shaft that is provided at one side relative to the medium support portion in a second direction intersecting the first direction and extending in the first direction; a second guide shaft that is provided at the other side relative to the medium support portion in the second direction and extending in the first direction; a first leg that is supported by the first guide shaft so as to be movable; and a second leg that is supported by the second guide shaft so as to be movable, the driving mechanism having a driving source and a transmission structure, the transmission structure transmitting a driving force generated by the driving source to the first leg and the second leg, the driving source being arranged between the first guide shaft and the second guide shaft in the second direction and driving the first leg and the second leg in the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a plan view showing an example of the overall structure of the printing device according to the present embodiment.

[0007] Figure 2 It is a perspective view showing an example of the structure of the driving mechanism.

[0008] Figure 3 It is a top view showing an example of the structure of the moving mechanism and the driving mechanism.

[0009] Figure 4 This is a perspective view showing an example of the structure of a foot.

[0010] Figure 5 This is a perspective view showing an example of the structure of a fixing member for fixing a foot to a second belt.

[0011] Figure 6 It is a perspective view showing an example of an adjustment mechanism for adjusting the tension of the first belt.

[0012] Figure 7 It is a perspective view showing an example of an adjustment mechanism for adjusting the tension of the second belt.

[0013] Figure 8 It is a perspective view showing an example of a detector that detects the origin position of the first leg portion in the front-rear direction. DETAILED DESCRIPTION

[0014] 1. Overall structure

[0015] Figure 1 It is a plan view showing an example of the overall structure of the printing device 1 according to the present embodiment.

[0016] like Figure 1 As shown, the printing device 1 includes a recording head 89a and a medium support unit 30. The medium support unit 30 supports the printing medium M. The recording head 89a forms an image on the printing medium M by ejecting liquid such as ink. That is, the printing device 1 is a device that forms an image on the printing medium M by ejecting liquid from the recording head 89a.

[0017] The printing medium M is a sheet, cloth or a three-dimensional object. The sheet can be a sheet made of paper or synthetic resin. The cloth can be any of non-woven fabrics, knitted fabrics and cloth. The three-dimensional object includes clothing, shoes and other clothing, daily necessities, mechanical parts, and other various objects.

[0018] There is no limitation on the type of liquid ejected by the printing device 1 to the printing medium M as long as it has fluidity. For example, the printing device 1 is a printer that forms an image on the printing medium M by ejecting one or more colors of ink toward the surface of the printing medium M through the recording head 89a.

[0019] exist Figures 1 to 8 In each of the drawings, an X-axis, a Y-axis, and a Z-axis are shown. The X-axis, the Y-axis, and the Z-axis are orthogonal to each other. The Z-axis is an axis extending in the up-down direction. The X-axis and the Y-axis are parallel to the horizontal plane. In the following description, the direction along the X-axis is set as the left-right direction, and the direction along the Y-axis is set as the front-back direction. In detail, the positive direction of the Z-axis is set as the top, the positive direction of the X-axis is set as the left, and the positive direction of the Y-axis is set as the front.

[0020] The front-rear direction corresponds to an example of the “first direction”.

[0021] An example of the left-right direction and the "second direction". In addition, the second direction is a direction intersecting the first direction. In this embodiment, the case where the second direction is a direction orthogonal to the first direction is described.

[0022] The printing device 1 includes a bottom plate 13, a pair of base members 15, a pair of guide shafts 51, and a medium support portion 30. The base member 15 is a member extending in the left-right direction. The two base members 15 are arranged side by side in the front-back direction on the bottom plate 13 and are fixed to the bottom plate 13. The guide shafts 51 are shafts extending in the front-back direction, and the two guide shafts 51 are arranged side by side in the left-right direction in a manner spanning the two base members 15.

[0023] The guide shaft 51 is composed of a first guide shaft 51A and a second guide shaft 51B. The first guide shaft 51A is arranged at the right side relative to the medium support portion 30 in the left-right direction and extends in the front-rear direction. The second guide shaft 51B is arranged at the left side relative to the medium support portion 30 in the left-right direction and extends in the front-rear direction.

[0024] The right side corresponds to an example of "one side".

[0025] The left side corresponds to an example of the "other side".

[0026] For the guide shaft 51, refer to Figure 2 as well as Figure 3 Further explanation.

[0027] The medium support unit 30 supports the printing medium M. The medium support unit 30 includes a workbench 31 and a height moving mechanism 32. The workbench 31 is arranged at a position surrounded by a pair of base members 15 and a pair of guide shafts 51 in the front-back direction and the left-right direction. The workbench 31 has a supporting surface 31m. The supporting surface 31m is a rectangular surface parallel to the XY plane and facing upward. The supporting surface 31m supports the printing medium M placed on the supporting surface 31m.

[0028] The table 31 has protrusions 31n protruding outward from the support surface 31m at the bottom of the four corners of the support surface 31m in a plan view. The protrusions 31n are fixed to a lifting mechanism 39 described later, so that the table 31 is supported to be able to rise and fall relative to the base member 15.

[0029] The height moving mechanism 32 is a mechanism for raising and lowering the support surface 31m and the printing medium M supported on the support surface 31m by raising and lowering the workbench 31. The height moving mechanism 32 includes a lifting motor 33, a lifting belt 37, and a lifting mechanism 39. The lifting mechanism 39 includes a ball screw arranged in the up-down direction, a nut screwed with the ball screw, and a pulley. The ball screw of the lifting mechanism 39 is rotatably supported on the base member 15. The nut of the lifting mechanism 39 is fixed to the protrusion 31n of the workbench 31. The pulley of the lifting mechanism 39 is fixed to the upper part of the ball screw. When the pulley of the lifting mechanism 39 rotates, the ball screw rotates, and the protrusion 31n moves in the up-down direction together with the nut as the ball screw rotates.

[0030] The lifting motor 33 is a motor that rotates according to the control of a control unit (not shown). The control unit controls the rotation direction and rotation amount of the lifting motor 33. The lifting belt 37 is an endless belt mounted on the output shaft of the lifting motor 33 and the pulleys of the four lifting mechanisms 39. The lifting belt 37 is driven in a loop by the rotation of the lifting motor 33. The lifting belt 37 transmits the rotation of the lifting motor 33 to the four pulleys of the lifting mechanism 39. As a result, the ball screw of the lifting mechanism 39 rotates, and the worktable 31 moves in the up and down direction.

[0031] The rotation direction of the lifting motor 33 can be switched between a forward direction for moving the stage 31 upward and a reverse direction for moving the stage 31 downward. The printing device 1 raises and lowers the stage 31 by operating the lifting motor 33 .

[0032] The carriage 89 is a substantially rectangular parallelepiped box body, and is supported on the main frame 71 via the carriage guide shaft 83. The carriage guide shaft 83 is an axial member fixed to the main frame 71, and extends in the left-right direction along the main frame 71. Both ends of the main frame 71 in the left-right direction are supported by a pair of legs 73 of the moving mechanism 70.

[0033] Regarding the moving mechanism 70, refer to Figure 2 as well as Figure 3 For explanation.

[0034] The carriage guide shaft 83 supports the carriage 89 so as to be movable in the left-right direction. In addition, the lower end of the carriage 89 is located above the position of the support surface 31m when the worktable 31 is located at the uppermost position. Therefore, the carriage 89 does not interfere with the support surface 31m, and moves in the front-rear direction and the left-right direction above the support surface 31m.

[0035] The carriage 89 is connected to a carriage drive belt 85. The carriage drive belt 85 is an endless belt arranged along the carriage guide shaft 83 by having one end mounted on a carriage drive pulley 86 and the other end mounted on an output shaft of a carriage drive motor 87. The carriage drive pulley 86 is a pulley rotatably fixed to the right end of the main frame 71. The carriage drive motor 87 is a motor fixed to the left end of the main frame 71 and having its output shaft rotated in accordance with control by a control unit (not shown).

[0036] The carriage drive motor 87 rotates the output shaft to circulate the carriage drive belt 85 . Thus, the carriage drive motor 87 moves the carriage 89 connected to the carriage drive belt 85 in the left-right direction along the carriage guide shaft 83 .

[0037] The carriage 89 includes a recording head 89a and an irradiation unit 89b. The recording head 89a has a plurality of nozzles (not shown) that open downward from the lower end surface of the carriage 89. The recording head 89a ejects liquid from these nozzles by driving a piezoelectric actuator (not shown).

[0038] When the recording head 89a ejects liquid from the nozzle, the ejected liquid flies between the nozzle and the printing medium M placed on the workbench 31, and lands on the printing medium M. In the present embodiment, the liquid ejected from the nozzle by the recording head 89a is ink cured by ultraviolet rays. The recording head 89a forms characters and images formed by the liquid on the printing medium M supported by the medium support portion 30.

[0039] The recording head 89a corresponds to an example of a “printing section”.

[0040] The irradiation section 89b includes an irradiation window (not shown) facing downward from the lower end surface of the carriage 89. The irradiation window is formed of a plate-shaped member formed of a light-transmitting material. The irradiation section 89b emits irradiation light from a light source unit (not shown) through the irradiation window. The irradiation light emitted from the irradiation section 89b passes between the irradiation window and the printing medium M placed on the workbench 31, and irradiates the printing medium M on which the recording head 89a has performed recording.

[0041] In this embodiment, the irradiation unit 89b has a UV-LED (Ultraviolet Light Emitting Diode) that emits ultraviolet light, and the irradiation light is ultraviolet light. That is, in this embodiment, the irradiation unit 89b irradiates the ink that is sprayed on the printing medium M and is cured by ultraviolet light with ultraviolet light, so that the ink adheres to the printing medium M.

[0042] 2. Structure of moving mechanism and driving mechanism

[0043] Next, refer to Figure 2 as well as Figure 3 , the structures of the moving mechanism 70 and the driving mechanism 50 are described. Figure 2 It is a perspective view showing an example of the driving mechanism 50 . Figure 3 It is a plan view showing an example of the structure of the moving mechanism 70 and the driving mechanism 50 .

[0044] As reference Figure 1 As described above, the moving mechanism 70 is configured to support the carriage 89 and to be movable in the front-rear direction relative to the medium supporting portion 30. The driving mechanism 50 moves the moving mechanism 70 in the front-rear direction.

[0045] The moving mechanism 70 is composed of a first moving mechanism 70A and a second moving mechanism 70B. The second moving mechanism 70B is configured similarly to the first moving mechanism 70A.

[0046] The first moving mechanism 70A includes a first guide shaft 51A, a first leg 73A, and a first frame 75A. The second moving mechanism 70B includes a second guide shaft 51B, a second leg 73B, and a second frame 75B.

[0047] The first guide shaft 51A is a cylindrical shaft that is provided on the right side relative to the medium support portion 30 in the left-right direction and extends in the front-rear direction. The first guide shaft 51A supports the first leg portion 73A so that it can move in the front-rear direction. The second guide shaft 51B is a cylindrical shaft that is provided on the left side relative to the medium support portion 30 in the left-right direction and extends in the front-rear direction. The second guide shaft 51B supports the second leg portion 73B so that it can move in the front-rear direction.

[0048] The second guide shaft 51B is configured to be the same as the first guide shaft 51A. That is, the material of the second guide shaft 51B is the same as the material of the first guide shaft 51A. In addition, the diameter of the second guide shaft 51B is formed to be the same as the diameter of the first guide shaft 51A. The length of the second guide shaft 51B is formed to be the same as the length of the first guide shaft 51A. In addition, the second guide shaft 51B is arranged in the front-rear direction in the same manner as the first guide shaft 51A.

[0049] The first guide shaft 51A and the second guide shaft 51B correspond to the pair of guide shafts 51 .

[0050] The first leg portion 73A is Figure 1The first leg 73A is supported by the right end of the main frame 71 shown in the figure. The first leg 73A is supported by the first guide shaft 51A so as to be movable in the front-rear direction. The first leg 73A is moved in the front-rear direction on the first guide shaft 51A by the drive mechanism 50.

[0051] The second leg portion 73B is Figure 1 The second leg 73B is supported by the left end of the main frame 71 shown in the figure. The second leg 73B is supported by the second guide shaft 51B so as to be movable in the front-rear direction. The second leg 73B is moved in the front-rear direction on the second guide shaft 51B by the drive mechanism 50.

[0052] The second leg portion 73B is configured to be the same as the first leg portion 73A. That is, the shape of the second leg portion 73B is formed to be the same as the shape of the first leg portion 73A. In addition, the size of the second leg portion 73B is configured to be the same as the size of the first leg portion 73A. In addition, the second leg portion 73B is arranged along the front-back direction and the up-down direction, in other words, along the YZ plane, similarly to the first leg portion 73A.

[0053] The first leg portion 73A and the second leg portion 73B correspond to the pair of leg portions 73 .

[0054] For the structure of the leg portion 73, refer to Figure 4 And further explain.

[0055] The first frame 75A accommodates the first guide shaft 51A and the first leg 73A. The first frame 75A extends in the front-to-back direction. The first frame 75A is composed of a bottom member 751A and two side members 752A and 753A, and is substantially U-shaped when viewed from the front toward the rear. The first guide shaft 51A is fixed to the bottom surface of the first frame 75A.

[0056] The second frame 75B accommodates the second guide shaft 51B and the second leg 73B. The second frame 75B extends in the front-to-back direction. The second frame 75B is composed of a bottom member 751B and two side members 752B and 753B so as to be substantially U-shaped when viewed from the front toward the rear. The second guide shaft 51B is fixed to the bottom surface of the second frame 75B.

[0057] The second frame body 75B is configured similarly to the first frame body 75A. The first frame body 75A and the second frame body 75B correspond to the pair of frames 75 .

[0058] For the bottom members 751A, 751B and the side members 752A, 753A, 752B, 753B, refer to Figure 7 And further explain.

[0059] The drive mechanism 50 moves the first leg portion 73A along the first guide shaft 51A, and moves the second leg portion 73B along the second guide shaft 51B.

[0060] The driving mechanism 50 includes a leg driving motor 61 and a transmission structure 60 that transmits the driving force generated by the leg driving motor 61 to the first leg portion 73A and the second leg portion 73B.

[0061] The foot drive motor 61 is arranged at a position corresponding to the front end of the first guide shaft 51A and the second guide shaft 51B in the front-to-back direction. In addition, the foot drive motor 61 is arranged between the first guide shaft 51A and the second guide shaft 51B in the left-to-right direction. The foot drive motor 61 is preferably arranged, for example, at a substantially central position between the first guide shaft 51A and the second guide shaft 51B in the left-to-right direction. The foot drive motor 61 is more preferably arranged, for example, at a central position between the first belt 63A of the first transmission structure 60A and the first belt 63B of the second transmission structure 60B in the left-to-right direction. Figure 2 as well as Figure 3 , the first belt 63A and the first belt 63B are described below.

[0062] The leg driving motor 61 drives the first leg portion 73A and the second leg portion 73B in the front-rear direction via the transmission mechanism 60 by rotating the output shaft of the leg driving motor 61 in accordance with an instruction from a control unit (not shown).

[0063] The foot drive motor 61 corresponds to one example of a “drive source”.

[0064] In this way, the foot drive motor 61 is arranged between the first guide shaft 51A and the second guide shaft 51B in the left-right direction, so that the difference between the driving force transmitted to the first transmission structure 60A and the driving force transmitted to the second transmission structure 60B can be suppressed. For example, when the foot drive motor 61 is arranged at a central position between the first belt 63A of the first transmission structure 60A and the first belt 63B of the second transmission structure 60B in the left-right direction, the driving force transmitted to the first transmission structure 60A and the driving force transmitted to the second transmission structure 60B can be made consistent. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0065] The transmission structure 60 has a drive shaft 62 , a first transmission structure 60A, and a second transmission structure 60B.

[0066] The drive shaft 62 is driven to rotate via the output shaft of the foot drive motor 61 and the gear train 61A. The gear train 61A is composed of a plurality of gears meshing with each other. When the gear train 61A is composed of two gears, for example, one gear is integrally formed with the output shaft of the foot drive motor 61, and the other gear is integrally formed with the drive shaft 62. The driving force of the output shaft of the foot drive motor 61 is transmitted from the output shaft of the foot drive motor 61 to one gear, and from one gear to the other gear meshing with the one gear, and is transmitted from the other gear to the drive shaft 62 integrally formed with the other gear.

[0067] The drive shaft 62 is a cylindrical or cylindrical shaft extending in the left-right direction. A pair of first gears 621 are fixed to the drive shaft 62 at both ends in the left-right direction. The pair of first gears 621 is composed of a first gear 621A on the right side and a first gear 621B on the left side. The pair of first gears 621 are integrally rotated and driven with the drive shaft 62 through a gear train 61A.

[0068] The first gear 621A on the right side is included in the first transmission structure 60A, and the first gear 621B on the left side is included in the second transmission structure 60B.

[0069] The first transmission structure 60A and the second transmission structure 60B each include a first gear 621 , a first belt 63 , a composite gear 65 , a second belt 67 , and a second gear 69 .

[0070] When distinguishing between the first transmission structure 60A and the second transmission structure 60B, the first gear 621 of the first transmission structure 60A is described as the first gear 621A, and the first gear 621 of the second transmission structure 60B is described as the first gear 621B. In addition, when distinguishing between the first transmission structure 60A and the second transmission structure 60B, the first belt 63 of the first transmission structure 60A is described as the first belt 63A, and the first belt 63 of the second transmission structure 60B is described as the first belt 63B. In addition, when distinguishing between the first transmission structure 60A and the second transmission structure 60B, the composite gear 65 of the first transmission structure 60A is described as the composite gear 65A, and the composite gear 65 of the second transmission structure 60B is described as the composite gear 65B. In addition, when distinguishing between the first transmission structure 60A and the second transmission structure 60B, the second belt 67 of the first transmission structure 60A is described as the second belt 67A, and the second belt 67 of the second transmission structure 60B is described as the second belt 67B. Furthermore, when distinguishing between the first transmission mechanism 60A and the second transmission mechanism 60B, the second gear 69 of the first transmission mechanism 60A is described as a second gear 69A, and the second gear 69 of the second transmission mechanism 60B is described as a second gear 69B.

[0071] Regarding the second gear 69, refer to Figure 5 And further explain.

[0072] The composite gear 65 is arranged above the first gear 621. The composite gear 65 is composed of a rotating shaft 651, a third gear 652 and a fourth gear 653. The rotating shaft 651 extends in the left-right direction. Both ends of the rotating shaft 651 are rotatably supported on the frame 75. The rotating shaft 651 is inserted through the center of the third gear 652 and is integrally formed with the third gear 652. In addition, the rotating shaft 651 is inserted through the center of the fourth gear 653 and is integrally formed with the fourth gear 653. That is, the rotating shaft 651, the third gear 652 and the fourth gear 653 are integrally formed.

[0073] In addition, the fourth gear 653 is arranged on the left side with respect to the third gear 652. In addition, the diameter of the fourth gear 653 is smaller than the diameter of the third gear 652.

[0074] The first belt 63 is an endless belt that is mounted on the first gear 621 and the third gear 652 of the composite gear 65. The driving force transmitted from the foot drive motor 61 to the first gear 621 is transmitted to the composite gear 65 through the first belt 63. The composite gear 65 is arranged so that the center of the third gear 652 of the composite gear 65 in the front-rear direction is located directly above the center of the first gear 621 in the front-rear direction.

[0075] The second belt 67 is an endless belt mounted on the fourth gear 653 of the composite gear 65 and the second gear 69. The width of the second belt 67 is greater than the width of the first belt 63. Figure 5 As shown in FIG. 1 , the second belt 67 is rotatably supported at the rear end of the frame 75. Figure 5 As shown in the figure, it is fixed to the left side surface of the leg 73 by the fixing member 734. That is, the driving force transmitted from the leg driving motor 61 to the composite gear 65 is transmitted to the leg 73 through the second belt 67.

[0076] For the second gear 69 and the fixing member 734, refer to Figure 5 And further explain.

[0077] As mentioned above Figure 2 as well as Figure 3As described above, the driving force of the foot drive motor 61 is transmitted to the foot 73 through the path described below. That is, the driving force of the foot drive motor 61 is transmitted from the output shaft of the foot drive motor 61 to the drive shaft 62 via the gear train 61A. Moreover, the driving force transmitted to the drive shaft 62 is transmitted to the first belt 63 via the first gear 621. Furthermore, the driving force transmitted to the first belt 63 is transmitted to the third gear 652 of the composite gear 65. The driving force transmitted to the third gear 652 of the composite gear 65 is transmitted to the fourth gear 653 of the composite gear 65 via the rotating shaft 651 of the composite gear 65. The driving force transmitted to the fourth gear 653 is transmitted to the foot 73 via the second belt 67 and the fixing member 734.

[0078] The first transfer structure 60A and the second transfer structure 60B are configured identically to each other.

[0079] For example, the first gear 621A of the first transmission structure 60A and the first gear 621B of the second transmission structure 60B are configured to be identical to each other. For example, the material of the first gear 621A is identical to the material of the first gear 621B, and the size of the first gear 621A is identical to the size of the first gear 621B. For example, when the first gear 621A and the first gear 621B are made of plastic, the first gear 621A and the first gear 621B are manufactured using the same metal frame under the same manufacturing conditions.

[0080] In this way, since the first transmission structure 60A and the second transmission structure 60B are configured to be identical to each other, the driving force of the foot drive motor 61 can be evenly distributed to the first transmission structure 60A and the second transmission structure 60B. Therefore, the driving force acting on the first leg 73A and the driving force acting on the second leg 73B can be made consistent. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0081] Furthermore, since the first gear 621A and the first gear 621B are configured to be identical to each other, the driving force of the foot drive motor 61 can be equally distributed to the first belt 63A and the first belt 63B via the first gear 621A and the first gear 621B. Therefore, the driving force acting on the first foot 73A and the driving force acting on the second foot 73B can be made consistent. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0082] In addition, for example, the compound gear 65A of the first transmission structure 60A and the compound gear 65B of the second transmission structure 60B are configured to be identical to each other. In addition, the compound gear 65 is configured to be identical to each other by a rotating shaft 651, a third gear 652, and a fourth gear 653. Therefore, the rotating shaft 651A of the compound gear 65A and the rotating shaft 651B of the compound gear 65B are configured to be identical to each other. In addition, the third gear 652A of the compound gear 65A and the third gear 652B of the compound gear 65B are configured to be identical to each other. In addition, the fixed position of the third gear 652A of the compound gear 65A relative to the rotating shaft 651A and the fixed position of the third gear 652B of the compound gear 65B relative to the rotating shaft 651B are configured to be identical to each other. In addition, the fourth gear 653A of the compound gear 65A and the fourth gear 653B of the compound gear 65B are configured to be identical to each other. Furthermore, the fixed position of the fourth gear 653A of the compound gear 65A with respect to the rotation shaft 651A and the fixed position of the fourth gear 653B of the compound gear 65B with respect to the rotation shaft 651B are configured to be identical to each other.

[0083] For example, the fixed position of the composite gear 65A in the front-rear direction and the vertical direction on the first frame body 75A is configured to be at the same position as the fixed position of the composite gear 65B in the second frame body 75B in the front-rear direction and the vertical direction.

[0084] In addition, for example, the composite gear 65A of the first transmission structure 60A and the composite gear 65B of the second transmission structure 60B are arranged in the same direction. For example, in the first transmission structure 60A, the composite gear 65A is arranged on the first frame 75A in such a manner that the center position of the fourth gear 653A is located to the left relative to the center position of the third gear 652A. Similarly, in the second transmission structure 60B, the composite gear 65B is arranged on the second frame 75B in such a manner that the center position of the fourth gear 653B is located to the left relative to the center position of the third gear 652B. In addition, in other words, the composite gear 65A of the first transmission structure 60A and the composite gear 65B of the second transmission structure 60B are arranged to face the same direction as each other. For example, in the positive direction of the X-axis, the composite gear 65A and the composite gear 65B are arranged to face the same direction. In addition, for example, the relative position of the third gear 652A and the fourth gear 653A in the positive direction of the X-axis is the same as the relative position of the third gear 652B and the fourth gear 653B.

[0085] In this way, since the composite gear 65A and the composite gear 65B are configured to be identical to each other, the driving force of the foot drive motor 61 can be evenly distributed to the second belt 67A and the second belt 67B via the composite gear 65A and the composite gear 65B. Therefore, the driving force acting on the first foot 73A and the driving force acting on the second foot 73B can be made consistent. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0086] In addition, for example, the first belt 63A of the first transmission structure 60A and the first belt 63B of the second transmission structure 60B are configured to be identical to each other. For example, the first belt 63A is arranged on the right side relative to the first leg 73A, and the first belt 63B is arranged on the right side relative to the second leg 73B. In addition, for example, the first belt 63A and the first belt 63B are composed of toothed belts of the same material. The toothed belt is a belt formed with ribs in a manner that meshes with the teeth formed on the outer periphery of the first gear 621 and the teeth formed on the outer periphery of the third gear 652 of the composite gear 65.

[0087] In addition, the first belt 63A and the first belt 63B are formed by, for example, an open belt. In this case, the first belt 63A and the first belt 63B are composed of toothed belts of the same size. In addition, the first belt 63A and the first belt 63B are formed by cutting the same toothed belts to the same length and joining the two ends.

[0088] In this way, since the first belt 63A and the first belt 63B are configured to be identical to each other, the driving force of the foot drive motor 61 can be evenly distributed to the compound gear 65A and the compound gear 65B via the first belt 63A and the first belt 63B. Therefore, the driving force acting on the first foot 73A and the driving force acting on the second foot 73B can be made consistent. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0089] In addition, for example, the second belt 67A of the first transmission structure 60A and the second belt 67B of the second transmission structure 60B are configured to be identical to each other. For example, the second belt 67A and the second belt 67A are configured by toothed belts of the same material. The toothed belt is a belt having ribs formed so as to mesh with teeth formed on the outer periphery of the fourth gear 653 of the composite gear 65 and teeth formed on the outer periphery of the second gear 69.

[0090] In addition, the second belt 67A and the second belt 67B are formed by, for example, an open belt. In this case, the second belt 67A and the second belt 67B are composed of toothed belts of the same size. In addition, the second belt 67A and the second belt 67B are formed by cutting the same toothed belts to the same length and joining the two ends.

[0091] In this way, since the second belt 67A and the second belt 67B are configured to be identical to each other, the driving force of the foot drive motor 61 can be evenly distributed to the first foot 73A and the second foot 73B via the second belt 67A and the second belt 67B. Therefore, the driving force acting on the first foot 73A and the driving force acting on the second foot 73B can be made consistent. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0092] As reference Figures 1 to 3 As described above, the moving mechanism 70 includes a main frame 71, a pair of legs 73, and a carriage 89. The main frame 71 is a plate-shaped member that is long in the left-right direction. The pair of legs 73 are engaged with the pair of guide shafts 51 and move along the guide shafts 51. The main frame 71 is fixed to the upper ends of the pair of legs 73 and supported from below by the pair of legs 73. The main frame 71 and the pair of legs 73 are guided by the pair of guide shafts 51 and move in the front-rear direction.

[0093] The pair of legs 73 are driven by the driving mechanism 50. Specifically, the pair of legs 73 are fixed to the second belt 67 by the fixing members 734. Therefore, the power for moving the pair of legs 73 in the front-rear direction by the second belt 67 being circulated and driven acts on the pair of legs 73. Thus, the moving mechanism 70 moves in the front-rear direction.

[0094] The rotation direction of the foot drive motor 61 can be switched between a forward direction for moving the main frame 71 forward and a reverse direction for moving the main frame 71 backward. The printing device 1 moves the main frame 71 forward and backward by operating the foot drive motor 61 in accordance with instructions from a control unit (not shown).

[0095] 3. The structure of the foot

[0096] Next, refer to Figure 4 as well as Figure 5 , the structure of the leg 73 is described. Figure 4 It is a perspective view showing an example of the structure of the leg part 73.

[0097] like Figure 4 As shown, the leg portion 73 includes a first component 731 , a second component 732 , and a third component 733 .

[0098] The first component 731 is a component that realizes the main function of the leg 73. The first component 731 is formed of, for example, hard plastic. In order to ensure strength, ribs are formed in a lattice shape on the first component 731. The ribs are formed to protrude leftward from a plate-like component formed at the right end of the first component 731.

[0099] The upper end portion 731A of the first member 731 is formed in a flat shape. The right end portion of the main frame 71 is fixed to the upper end portion 731A.

[0100] The lower end portion 731B of the first member 731 is formed as a concave portion convex upward. The concave portion extends in the front-rear direction. The concave portion formed in the lower end portion 731B is fitted with the guide shaft 51 in a manner that allows movement in the front-rear direction.

[0101] The second member 732 is a plate-shaped member arranged along the left side surface of the first member 731. The second member 732 is formed of metal such as stainless steel. In addition, the second member 732 is fixed to the left side surface of the first member 731 by a plurality of bolts.

[0102] The third member 733 is a plate-shaped member disposed along the right side surface of the first member 731. The third member 733 is formed of metal such as stainless steel. In addition, the third member 733 is fixed to the right side surface of the first member 731 by a plurality of bolts.

[0103] The second member 732 and the third member 733 are reinforcement members fixed to the first member 731 in order to increase the strength of the leg portion 73 .

[0104] Figure 5 73 is a perspective view showing an example of the structure of the fixing member 734 for fixing the foot 73 to the second belt 67. Figure 5 As shown, the fixing member 734 is formed on the left side surface of the leg 73 so as to protrude leftward. The fixing member 734 fixes the leg 73 to the second belt 67.

[0105] The rear end of the second belt 67 is mounted on the second gear 69. The second gear 69 is vertically erected at the rear end of the frame 75 and is rotatably disposed on a frame extending in the front-rear direction about an axis extending in the left-right direction.

[0106] The fixing member 734 fixes the leg portion 73 on the lower path of the second belt 67 .

[0107] When the upper path of the second belt 67 is driven backward as indicated by arrows and the lower path of the second belt 67 is driven forward, the leg portion 73 moves forward as indicated by blank arrows.

[0108] The fixing member 734 is composed of an upper member 734A and a lower member 734B. The upper member 734A and the lower member 734B are fixed to the second belt 67 by sandwiching the second belt 67 of the lower path.

[0109] The upper member 734A is arranged between the upper path of the second belt 67 and the lower path of the second belt 67, and is fixed to the upper surface of the lower path of the second belt 67. The second belt 67 is a belt having ribs formed thereon so as to mesh with the teeth formed on the outer periphery of the fourth gear 653 of the composite gear 65 and the teeth formed on the outer periphery of the second gear 69. The ribs of the second belt 67 are formed on the upper surface of the second belt 67 in the lower path of the second belt 67. A rib protruding downward is formed on the lower surface of the upper member 734A so as to fit with the rib formed on the upper surface of the second belt 67.

[0110] In this way, the rib formed on the lower surface of the upper member 734A is fitted with the rib of the second belt 67 , so that the fixing member 734 is securely fixed to the second belt 67 .

[0111] The lower member 734B is arranged at the lower side of the path on the lower side of the second belt 67. Ribs are formed on the upper surface of the lower member 734B to increase the friction coefficient with the second belt 67. The ribs formed on the upper surface of the lower member 734B are arranged to be staggered in the front-rear direction relative to the ribs formed on the lower surface of the upper member 734A so as to mesh with the ribs formed on the lower surface of the upper member 734A.

[0112] In this way, the ribs formed on the upper surface of the lower component 734B are staggered in the front-to-back direction relative to the ribs formed on the lower surface of the upper component 734A in a manner that engages with the ribs formed on the lower surface of the upper component 734A, so that the fixing component 734 is securely fixed to the second belt 67.

[0113] 4. Belt tension adjustment mechanism

[0114] Next, refer to Figure 6 as well as Figure 7 , an adjustment mechanism for adjusting the tension of the first belt 63 and the second belt 67 will be described.

[0115] Figure 6 It is a perspective view showing an example of an adjustment mechanism for adjusting the tension of the first belt 63 .

[0116] The first transmission structure 60A includes a first adjustment mechanism for adjusting the tension of the first belt 63A. Similarly, the second transmission structure 60B includes a second adjustment mechanism for adjusting the tension of the first belt 63B. The first adjustment mechanism and the second adjustment mechanism are arranged at the same position in the front-back direction. In addition, the first adjustment mechanism and the second adjustment mechanism have the same structure as each other.

[0117] Therefore, refer to Figure 6 , the first adjustment mechanism is described, while the description of the second adjustment mechanism is omitted.

[0118] exist Figure 6 , the first belt 63 is the first belt 63A of the first transfer structure 60A. The first belt 63A is as shown in FIG. Figure 2 As described above, the endless belt is stretched between the first gear 621A and the third gear 652A of the composite gear 65A.

[0119] The third gear 652A of the composite gear 65A is arranged above the first gear 621 A. In the path on the rear side of the first belt 63A, a tension adjustment pulley 64A is arranged so as to press the first belt 63A forward.

[0120] The tension adjustment pulley 64A is configured to be rotatable around a rotation shaft 641A extending in the left-right direction. The rotation shaft 641A is supported by a support member 642A. The support member 642A is a plate-shaped member fixed to the front end of the first frame body 75A. The support member 642A is fixed to the front end of the first frame body 75A in a manner parallel to the XZ plane. A long hole LH1 is formed in the support member 642A for the rotation shaft 641A to be inserted. The long hole LH1 extends in the front-back direction.

[0121] The tension adjusting pulley 64A and the long hole LH1 correspond to an example of a “first adjusting mechanism”.

[0122] By moving the rotating shaft 641A forward, the tension adjusting pulley 64A moves forward, and the tension of the first belt 63A can be increased. In addition, by moving the rotating shaft 641A backward, the tension adjusting pulley 64A moves backward, and the tension of the first belt 63A can be reduced. In this way, by adjusting the position of the tension adjusting pulley 64A, the tension of the first belt 63A can be adjusted.

[0123] An encoder 622 is disposed at the right end of the drive shaft 62. The encoder 622 detects the rotation direction and rotation speed of the drive shaft 62. There are four types of encoders 622: mechanical, optical, magnetic, and electromagnetic induction. The case where the encoder 622 is, for example, a magnetic type is described. The encoder 622 is composed of a circular plate mounted on the drive shaft 62 and a magnetic sensor. The circular plate is formed with an S pole and an N pole as a permanent magnet.

[0124] The magnetic sensor reads the change of the magnetic field distribution generated by the permanent magnet due to the rotation of the circular plate. Then, the magnetic sensor detects the rotation direction and rotation speed of the drive shaft 62 based on the change of the magnetic field distribution. The magnetic sensor outputs the detected rotation direction and rotation speed of the drive shaft 62 to the control unit not shown. The control unit uses the rotation direction and rotation speed of the drive shaft 62 detected by the encoder 622 to control the rotation direction and rotation speed of the foot drive motor 61, thereby controlling the position of the first foot 73A and the second foot 73B.

[0125] Figure 7 FIG. 2 is a perspective view showing an example of an adjustment mechanism for adjusting the tension of the second belt 67. The adjustment mechanism is configured to adjust the tension of the second belt 67 by, for example, Figure 5 The rotation shaft 691 of the second gear 69 shown moves in the front-rear direction to adjust the tension of the second belt 67.

[0126] In addition, the first transmission structure 60A includes a third adjustment mechanism for adjusting the tension of the second belt 67A. Similarly, the second transmission structure 60B includes a fourth adjustment mechanism for adjusting the tension of the second belt 67B. The third adjustment mechanism and the fourth adjustment mechanism are arranged at the same position in the vertical direction. In addition, the third adjustment mechanism and the fourth adjustment mechanism have the same structure as each other.

[0127] exist Figure 7 In the following, the adjustment mechanism for adjusting the tension of the second belt 67 is described. The adjustment mechanism includes a third adjustment mechanism and a fourth adjustment mechanism.

[0128] like Figure 7 As shown, the rotating shaft 691 of the second gear 69 is rotatably supported by a supporting member 692 .

[0129] The frame 75 includes a bottom member 751, a right side member 752, and a left side member 753. The bottom member 751 is formed in a U-shaped cross section and constitutes the bottom surface of the frame 75. The right side member 752 and the left side member 753 are fixed to the bottom member 751 by a plurality of bolts. The right side member 752 is a plate-shaped member, and is arranged on the right side of the bottom member 751 and fixed to the bottom member 751 in a manner parallel to the YZ plane. The left side member 753 is a plate-shaped member, and is arranged on the left side of the bottom member 751 and fixed to the bottom member 751 in a manner parallel to the YZ plane.

[0130] A long hole LH2 is formed at a substantially vertical center position of the rear end portions of the right side member 752 and the left side member 753, and a bolt for fixing the support member 692 is inserted through the long hole LH2. The long hole LH2 extends in the front-rear direction.

[0131] The support member 692 included in the first transmission structure 60A is described as a support member 692A, and the support member 692 included in the second transmission structure 60B is described as a support member 692B.

[0132] The supporting member 692A corresponds to an example of a “third adjustment mechanism” that adjusts the tension of the second belt 67A. The supporting member 692B corresponds to an example of a “fourth adjustment mechanism” that adjusts the tension of the second belt 67B.

[0133] By moving the support member 692 forward relative to the right side member 752 and the left side member 753, the second gear 69 moves forward, thereby reducing the tension of the second belt 67. In addition, by moving the support member 692 backward relative to the right side member 752 and the left side member 753, the second gear 69 moves backward, thereby increasing the tension of the second belt 67. In this way, by adjusting the position of the second gear 69, the tension of the second belt 67 can be adjusted.

[0134] 5. Detector for detecting the origin position of the first leg

[0135] Next, refer to Figure 8 , the detector S that detects the origin position of the first leg portion 73A in the front-rear direction is described. Figure 8 1 is a perspective view showing an example of a detector S that detects the origin position of the first leg portion 73A in the front-rear direction.

[0136] In addition, in this embodiment, although the case where the detector S detects the origin position of the first leg part 73A is described, the present invention is not limited to this. The detector S may detect the origin position of the second leg part 73B.

[0137] like Figure 8 As shown, the detector S includes a first detector SS and a second detector SE. The first detector SS detects the origin position of the front end of the first leg 73A. The second detector SE detects the origin position of the rear end of the first leg 73A.

[0138] The first detector SS and the second detector SE are each composed of, for example, a transmission type photoelectric sensor. The first detector SS and the second detector SE are fixed to the right side surface of the bottom member 751A of the first frame body 75A.

[0139] In the present embodiment, the case where the first detector SS and the second detector SE are each composed of a transmission type photoelectric sensor is described, but the present invention is not limited thereto. The first detector SS and the second detector SE may each be composed of a reflection type photoelectric sensor.

[0140] The first detector SS and the second detector SE have the same structure as each other. Therefore, in the following description, the second detector SE is described, and the description of the first detector SS is omitted.

[0141] A detection rib 735A is arranged on the right side surface of the first leg 73A. The detection rib 735A is formed in a flat plate shape and arranged in parallel with the XY plane. The second detector SE includes a light projector SE1 and a light receiver SE2. The light projector SE1 is arranged at the upper side relative to the detection rib 735A. The light receiver SE2 is arranged at the lower side relative to the detection rib 735A. When the first leg 73A is arranged at the origin position at the rear end, the detection rib 735A blocks the light irradiated from the light projector SE1 to the light receiver SE2.

[0142] When the detection rib 735A blocks the light irradiated from the projector SE1 toward the light receiver SE2, the light receiver SE2 outputs a detection signal indicating that the first leg 73A is located at the origin position at the rear end to a control unit (not shown). The control unit adjusts the count value indicating the position of the first leg 73A in the front-rear direction, for example, based on the detection signal from the light receiver SE2.

[0143] In this way, the control unit can adjust the count value indicating the position of the first leg 73A in the front-rear direction, for example, based on the detection result of the detector S. Therefore, the deviation of the count value can be appropriately adjusted. Therefore, the count value indicating the position of the first leg 73A in the front-rear direction can be adjusted to an appropriate value.

[0144] 6. Effects, etc.

[0145] As described above, the printing device 1 involved in this embodiment includes: a medium support portion 30, which supports the printing medium M; a recording head 89a, which prints on the printing medium M; a moving mechanism 70, which is configured to support the recording head 89a and can move in the front-to-back direction relative to the medium support portion 30; a driving mechanism 50, which moves the moving mechanism 70 in the front-to-back direction, and the moving mechanism 70 includes: a first guide shaft 51A, which is arranged on the right side relative to the medium support portion 30 in the left-right direction and extends in the front-to-back direction; a second guide shaft 51B, which is arranged on the right side relative to the medium support portion 30 in the left-right direction It is arranged on the left side of the medium support part 30 and extends in the front-to-back direction; the first foot 73A is supported by the first guide shaft 51A so as to be movable; the second foot 73B is supported by the second guide shaft 51B so as to be movable, the driving mechanism 50 has a foot driving motor 61 and a transmission structure 60, the transmission structure 60 transmits the driving force generated by the foot driving motor 61 to the first foot 73A and the second foot 73B, the foot driving motor 61 is arranged between the first guide shaft 51A and the second guide shaft 51B in the left-right direction, and drives the first foot 73A and the second foot 73B in the front-to-back direction.

[0146] According to this structure, the foot drive motor 61 is arranged between the first guide shaft 51A and the second guide shaft 51B in the left-right direction. Therefore, it is possible to suppress the generation of a difference between the driving force transmitted from the foot drive motor 61 to the transmission structure 60 that transmits the driving force to the first foot 73A and the driving force transmitted to the transmission structure 60 that transmits the driving force to the second foot 73B. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0147] Furthermore, in the printing device 1 , the foot driving motor 61 is disposed substantially at the center between the first guide shaft 51A and the second guide shaft 51B in the left-right direction.

[0148] According to this structure, the foot drive motor 61 is arranged at the approximate center between the first guide shaft 51A and the second guide shaft 51B in the left-right direction. Therefore, it is possible to suppress the generation of a difference between the driving force transmitted from the foot drive motor 61 to the transmission structure 60 that transmits the driving force to the first foot 73A and the driving force transmitted to the transmission structure 60 that transmits the driving force to the second foot 73B. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0149] In addition, in the printing device 1, the transmission structure 60 has: a driving shaft 62 extending in the left-right direction; a first transmission structure 60A, which transmits the driving force from the driving shaft 62 to the first leg 73A; and a second transmission structure 60B, which transmits the driving force from the driving shaft 62 to the second leg 73B. The first transmission structure 60A and the second transmission structure 60B are constructed to be identical to each other.

[0150] According to this structure, the first transmission structure 60A and the second transmission structure 60B are configured to be identical to each other. Therefore, it is possible to suppress the generation of a difference between the driving force transmitted to the first leg 73A through the first transmission structure 60A and the driving force transmitted to the second leg 73B through the second transmission structure 60B. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0151] In addition, in the printing device 1, the first transmission structure 60A and the second transmission structure 60B respectively have: a first gear 621, which is arranged at the end in the left-right direction of the driving shaft 62; a second belt 67, which transmits the driving force to the first leg 73A and the second leg 73B respectively; a first belt 63, which transmits the driving force between the first gear 621 and the second belt 67; a compound gear 65, which transmits the driving force between the first belt 63 and the second belt 67, the first gear 621A of the first transmission structure 60A and the first gear 621B of the second transmission structure 60B are constructed to be identical to each other, and the compound gear 65A of the first transmission structure 60A and the compound gear 65B of the second transmission structure 60B are constructed to be identical to each other.

[0152] According to this structure, the first gear 621A of the first transmission structure 60A and the first gear 621B of the second transmission structure 60B are configured to be identical to each other, and the compound gear 65A of the first transmission structure 60A and the compound gear 65B of the second transmission structure 60B are configured to be identical to each other. Therefore, it is possible to suppress the generation of a difference between the driving force transmitted to the first leg 73A via the first gear 621A and the compound gear 65A and the driving force transmitted to the second leg 73B via the first gear 621B and the compound gear 65B. Therefore, it is possible to make the first leg 73A and the second leg 73B move smoothly.

[0153] Furthermore, in the printing device 1 , the composite gear 65A of the first transmission mechanism 60A and the composite gear 65B of the second transmission mechanism 60B are arranged so as to face the same direction as each other.

[0154] According to this structure, the composite gear 65A and the composite gear 65B are arranged to face the same direction. Therefore, the difference between the driving force transmitted to the first leg 73A via the composite gear 65A and the driving force transmitted to the second leg 73B via the composite gear 65B can be suppressed. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0155] In the printing device 1 , the first belt 63A and the second belt 63B of the first transfer mechanism 60A and 60B are made of the same type of belt, and the second belt 67A and the second belt 67B of the first transfer mechanism 60A and 60B are made of the same type of belt.

[0156] According to this structure, the first belt 63A and the first belt 63B are made of the same type of belt, and the second belt 67A and the second belt 67B are made of the same type of belt. Therefore, it is possible to suppress the difference between the driving force transmitted to the first leg 73A via the first belt 63A and the second belt 67A and the driving force transmitted to the second leg 73B via the first belt 63B and the second belt 67B. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0157] Furthermore, in the printing device 1 , the width of the second tape 67 is greater than the width of the first tape 63 .

[0158] According to this structure, the width of the second belt 67 is larger than the width of the first belt 63. Therefore, the difference between the moving speed of the first leg 73A and the moving speed of the second leg 73B can be suppressed. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0159] Furthermore, in the printing device 1 , in the first transfer mechanism 60A, the second belt 67A is disposed on the left side relative to the first leg 73A in the left-right direction, and in the second transfer mechanism 60B, the second belt 67B is disposed on the left side relative to the second leg 73B in the left-right direction.

[0160] According to this structure, the second belt 67A is arranged on the left side relative to the first leg 73A in the left-right direction, and the second belt 67B is arranged on the left side relative to the second leg 73B in the left-right direction. Therefore, the difference between the moving speed of the first leg 73A and the moving speed of the second leg 73B can be suppressed. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0161] In addition, in the printing device 1, the first transmission structure 60A has a tension adjustment pulley 64A for adjusting the tension of the first belt 63A, and the second transmission structure 60B has a tension adjustment pulley 64B for adjusting the tension of the first belt 63B, and the tension adjustment pulley 64A and the tension adjustment pulley 64B are arranged at the same position in the up and down direction.

[0162] According to this structure, the tension adjustment pulley 64A and the tension adjustment pulley 64B are arranged at the same position in the vertical direction. It is possible to suppress the difference between the influence of the tension adjustment pulley 64A on the driving force transmitted by the first belt 63A and the influence of the tension adjustment pulley 64B on the driving force transmitted by the first belt 63B. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0163] Furthermore, in the printing device 1, the first transmission structure 60A has a support member 692A for adjusting the tension of the second belt 67A, and the second transmission structure 60B has a support member 692B for adjusting the tension of the second belt 67B, and the support member 692A and the support member 692B are arranged at the same position in the up-down direction.

[0164] According to this structure, the support member 692A and the support member 692B are arranged at the same position in the vertical direction. It is possible to suppress the difference between the influence of the support member 692A on the driving force transmitted by the second belt 67A and the influence of the support member 692A on the driving force transmitted by the second belt 67B. Therefore, the first leg 73A and the second leg 73B can be moved smoothly.

[0165] Furthermore, in the printing device 1 , the first transmission mechanism 60A includes a detector S that detects the origin position of the first leg portion 73A in the front-rear direction, and the detector S is disposed on the opposite side of the second belt 67A with respect to the first leg portion 73A.

[0166] According to this structure, the detector S detects the origin position of the front-back direction of the first leg 73A. Therefore, the count value of the position of the first leg 73A and the second leg 73B in the front-back direction can be corrected. In addition, the detector S is arranged on the side opposite to the second belt 67A with respect to the first leg 73A. Therefore, the origin position of the front-back direction of the first leg 73A can be accurately detected without being affected by the second belt 67A.

[0167] Furthermore, in the printing device 1 , the first leg portion 73A and the second leg portion 73B are configured identically to each other.

[0168] According to this structure, the first leg portion 73A and the second leg portion 73B are configured to be identical to each other. Therefore, the first leg portion 73A and the second leg portion 73B can be moved smoothly.

[0169] 5. Other implementation methods

[0170] The above-described present embodiment is merely a specific example to which the present invention is applied. The present invention is not limited to the configuration of the above-described present embodiment, but can be implemented in various forms within the scope of the gist of the invention.

[0171] In the present embodiment, although the description is given of a case where the foot drive motor 61 is arranged between the first guide shaft 51A and the second guide shaft 51B in the left-right direction, the present invention is not limited thereto. For example, it is preferable that the foot drive motor 61 is arranged at a substantially central position between the first guide shaft 51A and the second guide shaft 51B in the left-right direction. Furthermore, for example, it is more preferable that the foot drive motor 61 is arranged at a central position between the first belt 63A of the first transmission structure 60A and the first belt 63B of the second transmission structure 60B in the left-right direction.

[0172] When the foot drive motor 61 is disposed at a central position between the first belt 63A of the first transmission structure 60A and the first belt 63B of the second transmission structure 60B in the left-right direction, the driving force transmitted to the first transmission structure 60A and the driving force transmitted to the second transmission structure 60B can be made consistent. Therefore, the first foot 73A and the second foot 73B can be moved smoothly.

[0173] In the present embodiment, although the second belt 67 is described as being arranged on the left side of the leg 73, the present invention is not limited thereto. For example, the second belt 67 may be arranged on the right side of the leg 73. In this case, the second belt 67A is arranged on the right side of the first leg 73A, and the second belt 67B is arranged on the right side of the second leg 73B.

[0174] In this embodiment, after the recording head 89a discharges the liquid onto the printing medium M, the irradiation unit 89b irradiates the discharged liquid with irradiation light, but this is only an example. For example, the printing device 1 may not include the irradiation unit 89b.

[0175] Explanation of symbols

[0176] 1…printing device; 15…base member; 30…medium support portion; 31…work table; 31m…support surface; 31n…protrusion; 32…height moving mechanism; 33…lifting motor; 37…lifting belt; 39…lifting mechanism; 50…driving mechanism; 51…guide shaft; 51A…first guide shaft; 51B…second guide shaft; 60…transmission structure; 60A…first transmission structure; 60B…second transmission structure; 61…foot driving motor (driving source); 62…driving shaft; 621, 621A, 621B…first gear; 63, 63A, 63B…first belt; 64A…tension adjusting pulley (first adjusting mechanism); 64B…tension adjusting pulley (second adjusting mechanism); 65, 65A, 65 B…compound gear; 67, 67A, 67B…second belt; 69, 69A, 69B…second gear; 692…support member; 692A…support member (third adjustment mechanism); 692B…support member (fourth adjustment mechanism); 70…moving mechanism; 70A…first moving mechanism; 70B…second moving mechanism; 71…main frame; 73…foot; 73A…first foot; 73B…second foot; 75…frame; 75A…first frame; 75B…second frame; 89…slide; 89a…recording head (printing unit); LH1…long hole; LH2…long hole; M…printing medium; S…detector; SE…second detector; SE1…light projector; SE2…light receiver; SS…first detector.

Claims

1. A printing device comprising: A medium supporting portion, which supports the printing medium; a printing unit that performs printing on the printing medium; a moving mechanism configured to support the printing unit and to be movable in a first direction relative to the medium supporting unit; a driving mechanism that moves the moving mechanism along the first direction, The moving mechanism has: a first guide shaft disposed at one side relative to the medium supporting portion in a second direction intersecting the first direction and extending along the first direction; a second guide shaft disposed at the other side relative to the medium supporting portion in the second direction and extending in the first direction; a first leg portion movably supported by the first guide shaft; a second leg portion supported by the second guide shaft so as to be movable; The driving mechanism has a driving source and a transmission structure, The transmission structure transmits the driving force generated by the driving source to the first leg and the second leg. The driving source is disposed between the first guide shaft and the second guide shaft in the second direction, and drives the first leg portion and the second leg portion in the first direction.

2. The printing device according to claim 1, wherein: The driving source is arranged substantially at the center between the first guide shaft and the second guide shaft in the second direction.

3. The printing device according to claim 1, wherein: The transfer structure has: a drive shaft extending along the second direction; a first transmission structure for transmitting the driving force from the driving shaft to the first leg; a second transmission structure for transmitting the driving force from the driving shaft to the second leg portion, The first transfer structure and the second transfer structure are configured identically to each other.

4. The printing device according to claim 3, wherein: The first transmission structure and the second transmission structure respectively have: a first gear disposed at an end portion of the drive shaft in the second direction; a second belt, which transmits the driving force to the first leg and the second leg respectively; a first belt that transmits the driving force between the first gear and the second belt; a composite gear that transmits the driving force between the first belt and the second belt, The first gear of the first transmission structure and the first gear of the second transmission structure are configured to be identical to each other. The composite gear of the first transmission structure and the composite gear of the second transmission structure are configured identically to each other.

5. The printing device according to claim 4, wherein: The composite gear of the first transmission structure and the composite gear of the second transmission structure are arranged to face the same direction as each other.

6. The printing device according to claim 4, wherein: The first belt of the first transmission structure and the first belt of the second transmission structure are made of the same kind of belts, The second belt of the first transmission structure and the second belt of the second transmission structure are made of the same kind of belt as each other.

7. The printing device according to claim 4, wherein: The width of the second band is greater than the width of the first band.

8. The printing device according to claim 4, wherein: In the first transfer structure, the second belt is arranged at the other side relative to the first foot in the second direction, In the second transfer structure, the second belt is arranged at the other side with respect to the second foot in the second direction.

9. The printing device according to claim 4, wherein: The first transmission structure has a first adjustment mechanism for adjusting the tension of the first belt. The second transmission structure has a second adjustment mechanism for adjusting the tension of the first belt. The first adjustment mechanism and the second adjustment mechanism are arranged at the same position in the up-down direction.

10. The printing device according to claim 4, wherein: The first transmission structure has a third adjustment mechanism for adjusting the tension of the second belt. The second transmission structure has a fourth adjustment mechanism for adjusting the tension of the second belt. The third adjustment mechanism and the fourth adjustment mechanism are arranged at the same position in the up-down direction.

11. The printing device according to claim 4, wherein: The first transmission structure has a detector, and the detector detects the origin position of the first leg in the first direction. The detector is arranged on the opposite side of the second belt with respect to the first leg.

12. The printing device according to claim 1, wherein: The first leg portion and the second leg portion are configured identically to each other.

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