Manufacturing method of a traction device

Abstract

To adjust an endless member more finely than a distance corresponding to a pitch of teeth of a wheel.SOLUTION: A manufacturing method of manufacturing a traction gear 50 includes an adjustment step of adjusting the inclination state of a traction object body with respect to the main-scanning direction X by adjusting the relative position in the peripheral direction between wheels 61R, 61L. Gears 61Ra, 61Rb, 61Rc employed as one wheel 61R have groove parts 261Ra, 261Rb, 261Rc extending in the diameter direction of the gears 61Ra, 61Rb, 61Rc, and one end of a shaft 59 has a protrusion part 59d which is engaged with the groove parts 261Ra, 261Rb, 261Rc. The adjustment step adjusts the inclination state of the traction object body by selecting any of the gears 61Ra, 61Rb, 61Rc with mutually-different extension directions of the groove parts 261Ra, 261Rb, 261Rc with respect to the protrusion direction of the teeth.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to Manufacturing method of a traction device .

Background Art

[0002] Patent Document 1 discloses a technique in which a photosensitive drum is rotationally driven by two winding transmission mechanisms and a motor. The motor is connected to a gear transmission mechanism, the gear transmission mechanism is connected to a shaft, both ends of the shaft are respectively connected to two winding transmission mechanisms, and the two winding transmission mechanisms are respectively connected to both ends of the photosensitive drum. When an assembly error occurs such that the photosensitive drum is twisted, it is necessary to rewind the belt of one of the winding transmission mechanisms around the pulley at the end of the photosensitive drum so as to relatively displace the belt in the circumferential direction of the photosensitive drum. However, when the pulley and the belt have teeth, only an adjustment can be made in increments corresponding to the pitch of the teeth to displace the belt. In Patent Document 1, it is unclear whether the pulley and the belt have teeth.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, an object of one or more embodiments of the present invention is to enable more precise adjustment of an endless member such as a belt than the distance corresponding to the tooth pitch when relatively displacing the endless member in the circumferential direction with respect to a wheel such as a pulley.

Means for Solving the Problems

[0005] According to one aspect of the present invention, a method for manufacturing a traction device is provided, which pulls a traction body from both ends of the traction body in a second direction perpendicular to the first direction by the rotation of a pair of toothed endless belts accompanying the rotation of a pair of gears connected by a shaft extending in a first direction, the method comprising an adjustment step to adjust the inclination state of the traction body with respect to the first direction by adjusting the relative circumferential position between the pair of gears, wherein at least one of the pair of gears has a groove extending in the diametrical direction of the gear, with the gear being an insertion hole into which one end of the shaft is inserted, while the one end of the shaft has a projection that engages with the groove, and the adjustment step is to adjust the inclination state of the traction body by selecting any gear from among a plurality of gears in which the direction of extension of the groove with respect to the direction of protrusion of the teeth of the gear are different from each other. [Effects of the Invention]

[0006] According to one or more embodiments of the present invention, the endless member can be adjusted to a distance finer than the pitch of the teeth of one of the gears in a pair. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 shows the internal structure of the printing device. [Figure 2] Figure 2 shows the internal structure of the printing device. [Figure 3] Figure 3 shows the inkjet head located on the underside of the cartridge. [Figure 4] Figure 4 shows the shaft and the left and right wheels. [Figure 5] Figure 5 shows a towed body without tilt error. [Figure 6] Figure 6 shows a tractioned body with a tilt error. [Figure 7] Figure 7 shows a tractioned body with a tilt error. [Figure 8] Figure 8 shows the gear and transmission gear used as the first wheel. [Figure 9] Figure 9 shows the gear and transmission gear used as the first wheel. [Figure 10] Figure 10 shows multiple gears and multiple transmission gears used as the first wheel. [Figure 11] Figure 11 shows the multiple gears used as the first wheel removed from the shaft. [Figure 12] Figure 12 shows the second wheel. [Modes for carrying out the invention]

[0008] Embodiments will be described below with reference to the drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. The drawings are provided for illustrative purposes only, and therefore the scope of the present invention is not limited to the examples shown in the drawings.

[0009] [1. Printing device] Figure 1 is a perspective view showing the internal structure of the printing device 1. Figure 2 is a plan view showing the internal structure of the printing device 1.

[0010] In the following description, the first direction corresponds to the main scanning direction X, the second direction corresponds to the sub-scanning direction Y, and the main scanning direction X and the sub-scanning direction Y are orthogonal to each other. The width direction of the printing device 1 is parallel to the main scanning direction X, and the main scanning direction X is also called the left-right direction. The length direction of the printing device 1 is parallel to the sub-scanning direction Y, and the sub-scanning direction Y is also called the front-back direction. The height direction of the printing device 1 is perpendicular to the main scanning direction X and the sub-scanning direction Y. The direction perpendicular to the main scanning direction X and the sub-scanning direction Y is also called the up-down direction. When the printing device 1 is placed on a horizontal surface, the main scanning direction X and the sub-scanning direction Y are horizontal.

[0011] Printing device 1 is an inkjet printer that forms an image on a printing object by ejecting fine ink droplets onto the object. The printing object is a fingernail, more specifically, a fingernail of a hand. The printing object may also be a toenail, or an ornament such as a false nail, nail tip, earring, or ring.

[0012] The printing device 1 includes a base 10, a holder 15, first linear guides 21L and 21R, a movable body 25, a second linear guide 31, a carriage 35, cartridges 37 and 38, a linear drive mechanism 40, a traction device 50, and a maintenance unit 90. These components will be described in detail below.

[0013] [1-1. Base] The base 10 is covered by a housing (not shown) from above and is fixed to the housing. The single parts and assembled parts of the printing device 1 are incorporated into the base 10, and these single parts, assembled parts, and the base 10 are accommodated in the housing, whereby the printing device 1 is assembled. A single part is composed of one part, and an assembled part is a so-called assembly composed of a plurality of parts.

[0014] [1-2. Holder] The holder 15 is provided at the center in the left-right direction at the front end of the base 10. The holder 15 holds its fingers with the fingernails exposed. Therefore, the holder 15 is also called a finger holder. The holder 15 has a hollow inside, an insertion port 16 at its front end, and an opening 17 at the rear part of its upper surface. When a finger is inserted into the hollow of the holder 15 through the insertion port 16, the fingernail of the finger is exposed above the holder 15 through the opening 17.

[0015] [1-3. Maintenance Unit] The maintenance unit 90 is provided on the base 10 behind the left side of the holder 15. The maintenance unit 90 has a purge part that performs a purge process on the cartridges 37 and 38, a wiper that wipes the lower surfaces of the cartridges 37 and 38, and a scraper that removes the ink adhering to the wiper.

[0016] [1-4. First Linear Guide] The left first linear guide 21L is mounted on the base 10 to the left of the holder 15, and the right first linear guide 21R is mounted on the base 10 to the right of the holder 15. The first linear guides 21L and 21R are spaced apart from each other in the main scanning direction X. The first linear guides 21L and 21R extend parallel to each other in the width scanning direction Y. The first linear guides 21L and 21R linearly guide the movable body 25 and the second linear guide 31 in the sub-scanning direction Y.

[0017] [1-5. Movable body and second linear guide] The movable body 25 and the second linear guide 31 are mounted on the first linear guides 21L and 21R so as to be movable in the sub-scanning direction Y, and are spanned between the first linear guides 21L and 21R. The second linear guide 31 is assembled to the movable body 25, and the second linear guide 31 and the movable body 25 are integrated. The second linear guide 31 extends linearly in the main scanning direction X. The second linear guide 31 guides the carriage 35 and cartridges 37 and 38 in the main scanning direction X.

[0018] [1-6. Carriage] The carriage 35 is mounted to the second linear guide 31 and the movable body 25 so as to be movable in the main scanning direction X. The carriage 35 detachably holds the cartridges 37 and 38.

[0019] [1-7. Cartridges] Figure 3 is a bottom view of cartridges 37 and 38. Cartridge 37 has multiple ink cases and multiple inkjet heads 37a. These multiple inkjet heads 37a are each provided at the lower end of the multiple ink cases, and these inkjet heads 37a and ink cases are integrated. For example, multiple colors of ink such as cyan, magenta, and yellow are stored in the multiple ink cases, and the multiple inkjet heads 37a each receive ink from the multiple ink cases. Each inkjet head 37a has multiple nozzles 37b arranged in a straight line at regular intervals on its underside. When cartridge 37 is attached to carriage 35, the rows of these nozzles 37b are parallel to the sub-scanning direction Y. Each inkjet head 37a ejects ink individually downwards from its nozzles 37b.

[0020] The cartridge 38 has an ink case for storing base or coating ink, and an inkjet head 38a provided at the lower end of the ink case. The inkjet head 38a has a plurality of nozzles 38b arranged in multiple rows in a straight line on its lower surface. When the cartridge 38 is attached to the carriage 35, these rows of nozzles 38b are parallel to the sub-scanning direction Y. Before or after the inkjet head 37a of the cartridge 37 ejects the base or coating ink supplied from the ink case, the inkjet head 38a ejects the ink individually downwards from the nozzles 38b.

[0021] [1-8. Linear drive mechanism] As shown in Figures 1 and 2, the linear drive mechanism 40 is mounted on the movable body 25. The linear drive mechanism 40 drives the carriage 35 and cartridges 37 and 38 in the main scanning direction X. The linear drive mechanism 40 has a motor 41 and a linear drive mechanism 42. The motor 41 is attached to the carriage 35 near the left first linear guide 21L. The motor 41 converts electrical energy into rotational kinetic energy to generate rotational power. The linear drive mechanism 42 is connected to the motor 41 and the carriage 35. The linear drive mechanism 42 transmits the power of the motor 41 to the carriage 35 so as to convert the rotational motion of the motor 41 into linear motion of the carriage 35. The linear drive mechanism 42 is, for example, a winding drive mechanism, a ball screw drive mechanism, or a pinion rack mechanism.

[0022] [1-9. Towed object] The second linear guide 31, carriage 35, cartridges 37, 38, and linear drive mechanism 40 are mounted on the movable body 25, and a unit is constructed in which these second linear guide 31, carriage 35, cartridges 37, 38, linear drive mechanism 40, and movable body 25 are integrated. Such a unit is a towed body that is towed in the sub-scanning direction Y by a traction device 50 which acts as a linear drive mechanism. The traction device 50 will be described in detail below.

[0023] [1-10. Traction device] The traction device 50 is mounted on the base 10. The traction device 50 drives the movable body 25 in the sub-scanning direction Y by individually pulling the right and left parts of the movable body 25 in the sub-scanning direction Y. The traction device 50 comprises a motor 51, a gear transmission mechanism 52, a shaft 59, a right winding transmission mechanism 60R, and a left winding transmission mechanism 60L. The combination of the winding transmission mechanism 60R, the winding transmission mechanism 60L, and the shaft 59 constitutes a winding transmission mechanism pair.

[0024] The motor 51 converts electrical energy into rotational kinetic energy to generate rotational power. The motor 51 is mounted on the base 10 below the rear of the right first linear guide 21R, with its drive shaft oriented in the main scanning direction X.

[0025] The motor 51 is connected to the gear transmission mechanism 52. The gear transmission mechanism 52 is connected to the right-hand winding transmission mechanism 60R. The right-hand winding transmission mechanism 60R is connected to the shaft 59 and the right side of the movable body 25. The shaft 59 is connected to the left-hand winding transmission mechanism 60L.

[0026] The gear transmission mechanism 52 transmits power from the motor 51 to the shaft 59. The shaft 59 distributes the power from the motor 51 transmitted by the gear transmission mechanism 52 to the right winding transmission mechanism 60R and the left winding transmission mechanism 60L. The right winding transmission mechanism 60R transmits the rotational kinetic energy of the shaft 59 to the right side of the movable body 25 to convert the rotational motion of the shaft 59 into linear motion of the right side of the movable body 25, thereby pulling the right side of the movable body 25 in the sub-scanning direction Y. The left winding transmission mechanism 60L transmits the rotational kinetic energy of the shaft 59 to the left side of the movable body 25 to convert the rotational motion of the shaft 59 into linear motion of the left side of the movable body 25, thereby pulling the left side of the movable body 25 in the sub-scanning direction Y. Therefore, the movable body 25 moves in the sub-scanning direction Y by the power of the motor 51.

[0027] The gear transmission mechanism 52, shaft 59, and winding transmission mechanisms 60L and 60R will be described in detail.

[0028] The gear transmission mechanism 52 has a drive gear 53 and transmission gears 54, 55, and 56. The drive gear 53 is directly connected to the motor 51. The drive gear 53 meshes with the transmission gear 54. The transmission gears 54 and 55 are integrated so that their shafts are coaxial. The transmission gears 54 and 55 are rotatably mounted on the base 10. The transmission gear 55 meshes with the transmission gear 56. The transmission gear 56 is mounted on the right end of the shaft 59, and the transmission gear 56 and the shaft 59 are coaxial. The shaft 59 is rotatably mounted on the base 10 at the rear of the base 10.

[0029] The right-hand winding drive mechanism 60R has a first wheel 61R, a first driven wheel 62R, and a first endless member 63R. The left-hand winding drive mechanism 60L has a second wheel 61L, a second driven wheel 62L, and a second endless member 63L.

[0030] Figure 4 is a plan view showing the first wheel 61R, the second wheel 61L, the shaft 59, and the transmission gear 56. The first wheel 61R on the right is integrated with the transmission gear 56, and the shaft of the first wheel 61R is coaxial with the shaft of the transmission gear 56. The first wheel 61R is attached to the right end of the shaft 59, and the first wheel 61R and the shaft 59 are coaxial. The second wheel 61L on the left is attached to the left end of the shaft 59, separated to the left from the first wheel 61R, and the second wheel 61L and the shaft 59 are coaxial.

[0031] The first wheel 61R has multiple teeth arranged at a constant pitch in the circumferential direction on its outer circumference, such as a toothed pulley, sprocket, and gear. Similarly, the second wheel 61L has multiple teeth arranged at a constant pitch in the circumferential direction on its outer circumference, such as a toothed pulley, sprocket, and gear. In this embodiment, wheels 61R and 61L are toothed pulleys, i.e., gears.

[0032] The left second wheel 61L and the right first wheel 61R are similarly provided, the number of teeth of the left second wheel 61L and the number of teeth of the right first wheel 61R are equal, the diameter of the left second wheel 61L and the diameter of the right first wheel 61R are equal, and the tooth pitch of the left second wheel 61L and the tooth pitch of the right first wheel 61R are equal.

[0033] As shown in Figures 1 and 2, the right first driven wheel 62R is rotatably mounted on the front of the base 10 in front of the first wheel 61R. The left second driven wheel 62L is rotatably mounted on the front of the base 10 in front of the second wheel 61L.

[0034] The first driven wheel 62R has multiple teeth arranged at a constant pitch in the circumferential direction on its outer circumference, such as a toothed pulley, sprocket, toothed roller, and gear. The second driven wheel 62L has multiple teeth arranged at a constant pitch in the circumferential direction on its outer circumference, such as a toothed pulley, sprocket, toothed roller, and gear. In this embodiment, the driven wheels 62R and 62L are toothed pulleys, i.e., gears. The number of teeth of the driven wheels 62R and 62L are equal to each other, the diameters of the driven wheels 62R and 62L are equal to each other, and the pitches of the driven wheels 62R and 62L are equal to each other.

[0035] The endless members 63R and 63L have multiple locking parts arranged at a constant pitch in the circumferential direction, such as a toothed belt, a wire with a locking part, and a chain with a roller-type locking part. In this embodiment, the endless members 63R and 63L are toothed timing belts having multiple teeth on their inner circumference as locking parts.

[0036] The rightmost first endless member 63R is wrapped around the first wheel 61R and the first driven wheel 62R, and is stretched taut between the first wheel 61R and the first driven wheel 62R in the sub-scanning direction Y. The locking portion of the first endless member 63R engages with the teeth of the first wheel 61R and the first driven wheel 62R. The first endless member 63R is connected to the right end 25R of the movable body 25, and the right end 25R of the movable body 25 is pulled in the sub-scanning direction Y by the first endless member 63R.

[0037] The leftmost second endless member 63L is wrapped around the second wheel 61L and the second driven wheel 62L, and is stretched taut between the second wheel 61L and the second driven wheel 62L in the sub-scanning direction Y. The second endless member 63L and the first endless member 63R are spaced apart from each other in the main scanning direction X and extend parallel to each other in the sub-scanning direction Y. The locking portion of the second endless member 63L engages with the teeth of the second wheel 61L and the second driven wheel 62L. The second endless member 63L is connected to the left end 25L of the movable body 25, and the left end 25L of the movable body 25 is pulled in the sub-scanning direction Y by the second endless member 63L.

[0038] [2. Assembly Errors] Assembly errors may occur in the printing device 1 and the traction device 50. Here, assembly error refers to the inclination of the second linear guide 31 from a state where it extends perfectly and accurately in the main scanning direction X as shown in Figure 5, to a state where it tilts around an axis perpendicular to both the main scanning direction X and the sub-scanning direction Y (hereinafter referred to as the Z-axis), as shown in Figures 6 and 7, due to a phase difference occurring between the left and right endless members 63L and 63R. In the state shown in Figure 5, where the second linear guide 31 extends perfectly and accurately parallel to the main scanning direction X, the phase difference between the endless members 63L and 63R is zero, and no assembly error occurs. In the state shown in Figure 6, since the phase of the first endless member 63R lags behind the phase of the second endless member 63L, the left end of the second linear guide 31 is positioned in front of the right end of the second linear guide 31, resulting in an assembly error where the second linear guide 31, the movable body 25, and the tractioned body are tilted with respect to the main scanning direction X. In the state shown in Figure 7, the phase of the first endless member 63R is ahead of the phase of the second endless member 63L. As a result, the left end of the second linear guide 31 is positioned behind the right end of the second linear guide 31, causing an assembly error in which the second linear guide 31, the movable body 25, and the tractioned body are tilted with respect to the main scanning direction X. Note that one cycle in the phase of the endless members 63L and 63R refers to the cycle when the endless members 63L and 63R complete one rotation. The phase difference between the endless members 63L and 63R refers to the difference between the phase of the first endless member 63R and the phase of the second endless member 63L.

[0039] To eliminate the assembly errors shown in Figures 6 and 7, it is necessary to rewind the first endless member 63R onto the first wheel 61R in Figure 2 so that the first endless member 63R is circumferentially misaligned with respect to the first wheel 61R. This rewinding changes the phase of the first endless member 63R, eliminating the phase difference between the left and right endless members 63L and 63R, and adjusting the inclination of the second linear guide 31, the movable body 25, and the tractioned body with respect to the main scanning direction X. Similarly, even if the second endless member 63L is rewinded onto the second wheel 61L so that it is circumferentially misaligned with respect to the second wheel 61L, the phase difference between the left and right endless members 63L and 63R is eliminated.

[0040] Incidentally, simply shifting the first endless member 63R circumferentially relative to the first wheel 61R will only result in a displacement of an integer multiple of the tooth pitch of the first wheel 61R. The same applies when shifting the second endless member 63L circumferentially relative to the second wheel 61L. In other words, the phase difference between the left and right endless members 63L and 63R can only be adjusted in units of the tooth pitch of the wheels 61R and 61L.

[0041] Therefore, in order to adjust the phase difference between the left and right endless members 63L and 63R more precisely than the tooth pitch of the wheels 61R and 61L, the right first wheel 61R can be selected from among several gears. Below, several gears that can be used as the right first wheel 61R will be described in detail.

[0042] [2-1. Multiple Gears] Figure 8 is a right side view of a gear 61Ra that can be used in the first wheel 61R. Figure 9 is a left side view of the same gear 61Ra. The transmission gear 56a shown in Figures 8 and 9 can be used as the transmission gear 56 shown in Figures 1 to 3, and the gear 61Ra and the transmission gear 56a are integrated and their shafts are coaxial.

[0043] The gear 61Ra has a groove 261Ra and a fitting hole 161Ra on its left side. The left side of the gear 61Ra is the side facing the center of the shaft 59. The fitting hole 161Ra is formed concavely in the center of the left side of the gear 61Ra. The groove 261Ra is formed concavely on the left side of the gear 61Ra. The groove 261Ra extends radially outward from the fitting hole 161Ra along the diameter of the gear 61Ra, and the groove 261Ra and the fitting hole 161Ra are integrally connected to each other. The groove 261Ra and the fitting hole 161Ra are insertion holes into which the end of the shaft 59 and the retaining pin 59d (described later) are inserted.

[0044] Figure 10 shows gears 61Ra, 61Rb, and 61Rc for comparison with gears 61Rb and 61Rc. Figure 10(a) is a right side view of gear 61Ra, Figure 10(b) is a right side view of gear 61Rb, and Figure 10(c) is a right side view of gear 61Rc.

[0045] Similar to gear 61Ra, gears 61Rb and 61Rc can also be used as the first wheel 61R. One of these gears 61Ra, 61Rb, or 61Rc is pre-installed on the right end of shaft 59 as the first wheel 61R. Among gears 61Ra, 61Rb, and 61Rc, any gear that is not pre-installed on the right end of shaft 59 is a replacement wheel.

[0046] The transmission gears 56b and 56c, which are integrated with the gears 61Rb and 61Rc respectively, can be used as the transmission gear 56 shown in Figures 1 to 3. The transmission gears 56a, 56b, and 56c are provided in a similar manner to each other.

[0047] The gears 61Ra, 61Rb, and 61Rc are similarly arranged to each other, with equal numbers of teeth, equal diameters, and equal tooth pitches. Similar to gear 61Ra, gear 61Rb has a fitting hole 161Rb and a groove 261Rb on its left side, and gear 61Rc has a fitting hole 161Rc and a groove 261Rc on its left side.

[0048] In gear 61Ra, the groove 261Ra is not circumferentially misaligned with the diameter 361Ra, which connects the center of gear 61Ra to the apex of the gear teeth. In other words, the direction in which the groove 261Ra extends and the direction in which the diameter 361Ra extends are aligned in the circumferential direction. The direction in which the diameter 361Ra extends is the direction in which the teeth of gear 61Ra protrude.

[0049] In gear 61Rb, the groove 261Rb is circumferentially misaligned from the diameter 361Rb, which connects the center of gear 61Rb to the apex of the gear teeth. The amount of this misalignment is greater than zero and less than one pitch of the gear teeth, more specifically, half a pitch of the gear teeth.

[0050] In gear 61Rc, the groove 261Rc is offset circumferentially by one-third of the tooth pitch of gear 61Rc from the diameter 361Rc, which connects the center of gear 61Rc to the apex of the gear teeth 61Rc.

[0051] The groove 261Ra of gear 61Ra is not circumferentially misaligned with the spoke portion 561a. In other words, the groove 261Ra and the spoke portion 561a are aligned in the circumferential direction. The groove 261Rb of gear 61Rb is circumferentially misaligned with the spoke portion 561b by half a tooth pitch of gear 61Rb. The groove 261Rc of gear 61Rc is circumferentially misaligned with the spoke portion 561c by one-third of a tooth pitch of gear 61Rc. The spoke portions 561a, 561b, and 561c are formed as protrusions on the left and right sides of the transmission gears 56a, 56b, and 56c, respectively, and extend radially from the center to the outer circumference of the transmission gears 56a, 56b, and 56c, respectively.

[0052] Furthermore, other gears may be prepared, and one of the gears 61Ra, 61Rb, 61Rc, and the other gears may be pre-attached to the right end of the shaft 59. For example, other gears may be prepared such that the circumferential displacement of the groove is 2 / 3 of a pitch, 1 / 4 of a pitch, or 3 / 4 of a pitch. Between gears 61Ra, 61Rb, 61Rc, and the other gears, the circumferential displacement of the groove of each gear differs from the diameter connecting the center of each gear to the vertex of the teeth of each gear. Just as gear 61Ra and the transmission gear 56a are integrated with each other, a transmission gear similar to the transmission gear 56a is also integrated with the other gears.

[0053] [2-2. Right end of the shaft] Referring to Figure 11, the right end of the shaft 59 to which the first wheel 61R is attached will be described in detail. Here, Figure 11 is an exploded perspective view of the shaft 59 with the gears 61Ra, 61Rb, and 61Rc removed.

[0054] The shaft 59 has a retaining pin 59d as a protruding portion at its right end. The retaining pin 59d penetrates the shaft 59 radially and protrudes radially outward from the outer circumferential surface of the shaft 59.

[0055] When the gear 61Ra is mounted on the right end of the shaft 59 as the first wheel 61R, the right end of the shaft 59 is fitted into the fitting hole 161Ra, and the retaining pin 59d is fitted into the groove 261Ra. As a result, the gear 61Ra is mounted on the right end of the shaft 59 in a manner that prevents it from rotating circumferentially relative to the shaft 59.

[0056] When the gear 61Rb is attached to the right end of the shaft 59 as the first wheel 61R, the right end of the shaft 59 is fitted into the fitting hole 161Rb and the retaining pin 59d is fitted into the groove 261Rb.

[0057] When the gear 61Rc is attached to the right end of the shaft 59 as the first wheel 61R, the right end of the shaft 59 is fitted into the fitting hole 161Rc and the retaining pin 59d is fitted into the groove 261Rc.

[0058] As described above, the groove 261Ra of gear 61Ra is not circumferentially displaced from the diameter 361Ra, whereas the groove 261Rb of gear 61Rb is circumferentially displaced from the diameter 361Rb and the spoke portion 561b. Therefore, when gear 61Rb is mounted on the shaft 59, the position of the teeth of gear 61Rb is circumferentially displaced from the position of the teeth of gear 61Ra when gear 61Ra is mounted on the shaft 59, causing a phase difference between the teeth of gear 61Rb and gear 61Ra. The amount of this phase difference is greater than zero and less than one pitch of the teeth of gears 61Ra and 61Rb, more specifically, half a pitch of the teeth of gears 61Ra and 61Rb. Thus, when gear 61Ra is replaced with gear 61Rb, the phase of the right first endless member 63R changes by half a pitch of the teeth of gears 61Ra and 61Rb.

[0059] When gear 61Rc is mounted on shaft 59, the position of the teeth of gear 61Rc is shifted circumferentially from the position of the teeth of gear 61Ra when gear 61Ra is mounted on shaft 59, causing a phase difference between the teeth of gear 61Rc and gear 61Ra. The amount of this phase difference is one-third of the pitch of the teeth of gears 61Ra and 61Rc. Therefore, when gear 61Ra is replaced with gear 61Rc, the phase of the right-hand first endless member 63R changes by one-third of the pitch of the teeth of gears 61Ra and 61Rc.

[0060] [2-3. Relationship between the right first wheel and the left second wheel] Referring to Figure 12, the mounting of the left second wheel 61L and shaft 59 will be described in detail. Here, Figure 12 is a right side view of the second wheel 61L. The second wheel 61L has a second fitting hole 161L and a second groove 261L on its left side. The right side of the second wheel 61L is the side facing the center of the shaft 59. The second fitting hole 161L is formed concavely in the center of the right side of the second wheel 61L. The second groove 261L is formed concavely on the right side of the second wheel 61L. The second groove 261L extends radially outward from the second fitting hole 161L along the diameter of the second wheel 61L, and the second groove 261L and the second fitting hole 161L are integrally connected to each other. On the other hand, similar to the right end of the shaft 59, the shaft 59 has a retaining pin at its left end. The left end of the shaft 59 is fitted into the second fitting hole 161L, and the retaining pin is fitted into the second groove 261L. The retaining pin at the left end of the shaft 59 is not misaligned circumferentially from the retaining pin 59d at the right end of the shaft 59, and the positions of these retaining pins are aligned circumferentially.

[0061] The second wheel 61L on the left and the gears 61Ra, 61Rb, and 61Rc are similarly provided, and the second wheel 61L and the gears 61Ra, 61Rb, and 61Rc have the same number of teeth, the second wheel 61L and the gears 61Ra, 61Rb, and 61Rc have the same diameter, and the second wheel 61L and the gears 61Ra, 61Rb, and 61Rc have the same tooth pitch.

[0062] When the second wheel 61L and gear 61Ra are mounted on the shaft 59, the teeth of the second wheel 61L and gear 61Ra are aligned in the circumferential direction without any phase difference.

[0063] When the second wheel 61L and gear 61Rb are mounted on the shaft 59, the teeth of the second wheel 61L and gear 61Rb are misaligned in the circumferential direction, resulting in a phase difference between the teeth of the second wheel 61L and gear 61Rb. The amount of this phase difference is half the pitch of the teeth of the second wheel 61L and gear 61Rb.

[0064] When the second wheel 61L and gear 61Rc are mounted on the shaft 59, the teeth of the second wheel 61L and gear 61Rc are misaligned in the circumferential direction, resulting in a phase difference between the teeth of the second wheel 61L and gear 61Rc. The amount of this phase difference is one-third of the pitch of the teeth of the second wheel 61L and gear 61Rc.

[0065] [2-4. Preparation Method and Manufacturing Method] Next, we will explain the adjustment method performed as an intermediate step in the manufacturing process for assembling the printing device 1 and the traction device 50. By performing the adjustment method described below, assembly errors in the printing device 1 and the traction device 50 will be eliminated.

[0066] It is assumed that gear 61Ra is selected as the first wheel 61R from among gears 61Ra, 61Rb, and 61Rc, gear 61Ra is attached to the right end of shaft 59, and the first endless member 63R is wrapped around gear 61Ra. In this case, gears 61Rb and 61Rc are interchangeable wheels.

[0067] First, when the printing device 1 performs a test print operation, a test pattern is formed on the object to be printed in the holder 15. The object to be printed in the test is not limited to a fingernail; it may be a sheet or plate made of a material such as paper, resin, metal, ceramic, fiber, or wood.

[0068] The operator can observe the test pattern to understand the degree of assembly error in the tilt of the movable body 25, the second linear guide 31, and the tractioned body around the Z axis. In other words, the operator can understand the distance that the right end of the second linear guide 31 is displaced from its left end in the sub-scanning direction Y. However, the operator may also measure the distance that the right end of the second linear guide 31 is displaced from its left end in the sub-scanning direction Y without using the test pattern. The distance that the right end of the second linear guide 31 is displaced from its left end in the sub-scanning direction Y corresponds to the phase difference between the endless members 63R and 63L, as well as the tilt error of the movable body 25, the second linear guide 31, and the tractioned body. Therefore, in the following, this distance will also be referred to as the phase difference or tilt error.

[0069] Furthermore, if the shape of the test pattern is a rectangle or square with sides parallel to the main scanning direction X and the sub-scanning direction Y, then if there is an assembly error, the left and right sides of the test pattern will be distorted in a zigzag pattern, and the front and back sides will be slightly oblique to the main scanning direction X. If there is no assembly error at all, the left and right sides of the test pattern will be perfectly straight, and the front and back sides will be perfectly parallel to the main scanning direction X.

[0070] If the acquired tilt error or phase difference falls within the acceptable range, the worker terminates the work. On the other hand, if the acquired tilt error or phase difference falls outside the acceptable range, the worker determines an integer multiple of the tooth pitch of gears 61Ra, 61Rb, and 61Rc that most closely approximates the acquired tilt error or phase difference (hereinafter referred to as the integer multiple approximation), and calculates the difference by subtracting the integer multiple approximation from the tilt error or phase difference. Then, the worker compares this difference with three comparison values ​​and determines the comparison value closest to the difference. Of the three comparison values, the first comparison value is zero, the second comparison value is half the tooth pitch of gears 61Ra, 61Rb, and 61Rc, and the third comparison value is one-third the tooth pitch of gears 61Ra, 61Rb, and 61Rc. The first comparison value corresponds to gear 61Ra, the second comparison value corresponds to gear 61Rb, and the third comparison value corresponds to gear 61Rc.

[0071] If the difference is closest to the first comparison value among the three comparison values, the operator selects the first comparison value and the corresponding gear 61Ra. The operator shifts the first endless member 63R circumferentially by one or several pitches relative to the selected gear 61Ra and re-wraps the first endless member 63R around the gear 61Ra. Alternatively, the operator shifts the second endless member 63L circumferentially by one or several pitches relative to the second wheel 61L and re-wraps the second endless member 63L around the second wheel 61L. As a result, the phase difference and tilt error are reduced by an integer multiple of the pitch of the gear 61Ra teeth, and the tilt state of the second linear guide 31, the movable body 25, and the tractioned body with respect to the main scanning direction X is adjusted.

[0072] If the difference is closest to the second comparison value, the worker selects the second comparison value and the corresponding gear 61Rb, and replaces gear 61Ra and transmission gear 56a with gear 61Rb and transmission gear 56b. In other words, the worker moves the right end of shaft 59 from the fitting hole 161Ra of gear 61Ra to the fitting hole 161Rb of gear 61Rb, and moves the retaining pin 59d from the groove 261Ra of gear 61Ra to the groove 261Rb of gear 61Rb.

[0073] Then, the operator shifts the first endless member 63R circumferentially relative to the gear 61Rb by an integer multiple of the tooth pitch of the gear 61Rb (for example, several pitches such as 1 pitch, 2 pitch, and 3 pitch), and re-wraps the first endless member 63R around the gear 61Rb. Alternatively, the operator shifts the second endless member 63L circumferentially relative to the second wheel 61L by an integer multiple of the tooth pitch of the second wheel 61L (for example, several pitches such as 1 pitch, 2 pitch, and 3 pitch), and re-wraps the second endless member 63L around the second wheel 61L. As a result, the phase difference and tilt error are reduced by a value obtained by subtracting half a pitch from an integer multiple of the tooth pitch of the gear 61Rb, and the tilt state of the second linear guide 31, the movable body 25, and the tractioned body with respect to the main scanning direction X is adjusted.

[0074] If the difference is closest to the third comparison value, the worker selects the third comparison value and the corresponding gear 61Rc, and replaces gear 61Ra and transmission gear 56a with gear 61Rc and transmission gear 56c. In other words, the worker moves the right end of shaft 59 from the fitting hole 161Ra of gear 61Ra to the fitting hole 161Rc of gear 61Rc, and moves the retaining pin 59d from the groove 261Ra of gear 61Ra to the groove 261Rb of gear 61Rc.

[0075] Then, the operator shifts the first endless member 63R circumferentially relative to the gear 61Rb by an integer multiple of the tooth pitch of the gear 61Rc (for example, several pitches such as 1 pitch, 2 pitch, and 3 pitch), and re-wraps the first endless member 63R around the gear 61Rc. Alternatively, the operator shifts the second endless member 63L circumferentially relative to the second wheel 61L by an integer multiple of the tooth pitch of the second wheel 61L (for example, several pitches such as 1 pitch, 2 pitch, and 3 pitch), and re-wraps the second endless member 63L around the second wheel 61L. As a result, the phase difference and tilt error are reduced by a value obtained by subtracting 1 / 3 of a pitch from an integer multiple of the tooth pitch of the gear 61Rb, and the tilt state of the second linear guide 31, the movable body 25, and the tractioned body with respect to the main scanning direction X is adjusted.

[0076] Furthermore, if other gears are available in which the circumferential displacement of the groove is 2 / 3 of a pitch, 1 / 4 of a pitch, or 3 / 4 of a pitch, the gear 61Ra may be replaced with the other gear, and then the first endless member 63R may be shifted circumferentially relative to the other gear by an integer multiple of the pitch of the other gear's teeth (for example, 1 pitch, 2 pitches, 3 pitches, etc., several pitches), and the first endless member 63R may be rewound onto the other gear.

[0077] After the first endless member 63R or the second endless member 63L is shifted, a test pattern is formed on the test print object in the holder 15 by the printing device 1. Normally, the tilt error or phase difference obtained from the test pattern falls within the acceptable range, so the operator finishes the work. However, the tilt error or phase difference obtained from the test pattern may fall outside the acceptable range. In that case, the first wheel 61R and the transmission gear 56 are replaced, or without replacement, the first endless member 63R is shifted circumferentially relative to the first wheel 61R by an integer multiple of the tooth pitch of the first wheel 61R (for example, several pitches such as 1 pitch, 2 pitch, and 3 pitch), and the first endless member 63R is rewound onto the first wheel 61R. Alternatively, the first wheel 61R and the transmission gear 56 may be replaced, or not replaced, and the second endless member 63L may be shifted relative to the second wheel 61L by an integer multiple of the tooth pitch of the second wheel 61L (for example, several pitches such as 1 pitch, 2 pitch, and 3 pitch), and the second endless member 63L may be rewound around the second wheel 61L.

[0078] When the test pattern is first printed, gear 61Rb may be attached to the right end of shaft 59 as the first wheel 61R, or gear 61Rc may be attached to the right end of shaft 59 as the first wheel 61R. In either case, the first wheel 61R is replaced or not replaced, and the first endless member 63R is shifted circumferentially relative to the first wheel 61R by one or several pitches, and the first endless member 63R is rewound onto the first wheel 61R. Alternatively, the first wheel 61R is replaced or not replaced, and the second endless member 63L is shifted circumferentially relative to the second wheel 61L by one or several pitches, and the second endless member 63L is rewound onto the second wheel 61L. This reduces the tilt error.

[0079] After the adjustments are complete, the housing and other parts are assembled onto the base 10 to complete the printing device 1. After the adjustments are complete, the printing device 1 is shipped without replacing the gear 61Ra, 61Rb, and 61Rc, specifically the gear that is attached last to the right end of the shaft 59.

[0080] [3. Advantageous technical effects] (1) If a phase difference occurs between the left and right endless members 63L and 63R, and a tilt error occurs between the right and left ends of the movable body 25, the second linear guide 31, and the tractioned body, if the first endless member 63R is circumferentially misaligned relative to the gear 61Ra pre-attached to the right end of the shaft 59, the tilt error and phase difference will be eliminated by an integer multiple of the pitch of the teeth of the gear 61Ra, but they cannot be eliminated with finer precision. Even in such a case, if the gear 61Ra is replaced with a gear 61Rb or a gear 61Rc, and the first endless member 63R is circumferentially misaligned relative to the gear 61Rb or a gear 61Rc, the tilt error and phase difference will be eliminated by an amount equal to the difference obtained by subtracting the amount of phase misalignment from an integer multiple of the pitch of the teeth of the gear 61Rb or a gear 61Rc. Therefore, the tilt error and phase difference can be eliminated with fine precision. Similarly, even when the second endless member 63L is circumferentially misaligned relative to the second wheel 61L after replacing it with gear 61Rb or gear 61Rc, the inclination error and phase difference can be eliminated with fine precision. When gear 61Ra is replaced with gear 61Rb, the phase difference is half the pitch of gear 61Rb, and when gear 61Ra is replaced with gear 61Rc, the phase difference is one-third the pitch of gear 61Rc.

[0081] (2) The groove 261Ra of gear 61Ra is not circumferentially misaligned from the diameter 361Ra that connects the center of gear 61Ra to the top of the teeth of gear 61Ra, whereas the grooves 261Rb and 261Rb of gears 61Rb and 61Rc are circumferentially misaligned from the diameters 361Rb and 361Rc that connect the centers of gears 61Rb and 61Rc to the tops of the teeth of gears 61Rb and 61Rc. Therefore, simply by replacing the fitting hole 161Ra of gear 61Ra with the fitting hole 161Rb of gear 61Rb or the fitting hole 161Rc of gear 61Rc, and by replacing the retaining pin 59d with the groove 261Ra of gear 61Ra with the groove 261Rb of gear 61Rb or the groove 261Rc of gear 61Rc, a phase difference will occur between the teeth of the right first wheel 61R and the teeth of the left second wheel 61L. Thus, by simply replacing gear 61Ra with gear 61Rb or gear 61Rc, the tilt error and phase difference can be eliminated with fine precision as described in (1) above.

[0082] (3) Since the number of teeth of gears 61Ra, 61Rb, and 61Rc are equal, the diameters of gears 61Ra, 61Rb, and 61Rc are equal, and the pitch of the teeth of gears 61Ra, 61Rb, and 61Rc are equal, gears 61Rb and 61Rc have similar strength to gear 61Ra, and the teeth of gears 61Rb and 61Rc have similar strength to the teeth of gear 61Ra. Therefore, even if gear 61Ra is replaced with gear 61Rb or gear 61Rc, the mechanical strength of the right-hand winding drive mechanism 60R can be maintained. Also, since gears 61Rb and 61Rc are similar in size to gear 61Ra, even if gear 61Ra is replaced with gear 61Rb or gear 61Rc, the torque and power transmission performance of the right-hand winding drive mechanism 60R can be maintained.

[0083] (4) The groove 261Ra of gear 61Ra is not circumferentially misaligned from the diameter 361Ra that connects the center of gear 61Ra to the vertices of the teeth of gear 61Ra, whereas the grooves 261Rb and 261Rc of gears 61Rb and 61Rc are circumferentially misaligned from the diameter 361Rb and 361Rc that connects the centers of gears 61Rb and 61Rc to the vertices of the teeth of gears 61Rb and 61Rc. Therefore, gear 61Ra and gears 61Rb and 61Rc can be distinguished. Thus, it is possible to prevent the mistaken use of gear 61Rb or gear 61Rc when gear 61Ra should be used.

[0084] (5) The groove 261Ra of gear 61Ra is not circumferentially misaligned with the spoke portion 561a of transmission gear 56a, whereas the grooves 261Rb and 261Rc of gears 61Rb and 61Rc are circumferentially misaligned with the spoke portions 561b and 561c of transmission gears 56b and 56c. Therefore, gear 61Ra and transmission gear 56a can be distinguished from gears 61Rb and 61Rc and transmission gears 56b and 56c. Thus, it is possible to prevent the mistaken use of gear 61Rb and transmission gear 56b or gear 61Rc and transmission gear 56c when gear 61Ra and transmission gear 56a should be used.

[0085] [4. Additional remarks] Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the embodiments and illustrated examples described above, but includes the scope of the invention as described in the claims and its equivalents. The invention described in the claims initially attached to the application for this patent is listed below. The claim numbers listed below are the same as those in the claims initially attached to the application for this patent.

[0086] <Note> <Claim 1> A method for manufacturing a traction device that pulls a tractioned body from both ends of the tractioned body in a second direction perpendicular to the first direction by the rotation of a pair of toothed endless belts accompanying the rotation of a pair of gears connected by a shaft extending in a first direction, This includes an adjustment step to adjust the inclination state of the towed body with respect to the first direction by adjusting the relative circumferential position between the pair of gears, At least one of the pair of gears has a groove that extends in the diametrical direction of the gear, which serves as an insertion hole into which one end of the shaft is inserted, while the one end of the shaft has a projection that engages with the groove. The adjustment step involves selecting one of several gears in which the extension direction of the groove portion relative to the protruding direction of the teeth in the gear is different from that of the gear, thereby adjusting the inclination state of the traction body. A method for manufacturing a traction device. <Claim 2> The adjustment step adjusts the inclination state of the tractioned body by changing the phase difference between the pair of toothed endless belts by shifting the position of one of the pair of toothed endless belts in the circumferential direction relative to at least one of the gears of the pair. The value obtained by subtracting from the amount of change in the phase difference between the pair of toothed endless belts in the adjustment process an integer multiple of the pitch of the teeth of one of the gears that is closest to that amount of change is different among the plurality of gears. A method for manufacturing a traction device according to claim 1. <Claim 3> A method for manufacturing a traction device in which a first endless member and a second endless member are spaced apart from each other in a first direction and extend in a second direction perpendicular to the first direction, a movable body is connected to the first endless member and the second endless member, the first endless member is wrapped around a first wheel having teeth on its outer circumference, the second endless member is wrapped around a second wheel having teeth on its outer circumference, the first wheel and the second wheel are mounted on the shaft coaxially with the shaft, and the first endless member and the second endless member pull the movable body in a first direction by the rotation of the shaft, the first wheel and the second wheel, A replacement step involves replacing the first wheel with a replacement wheel having teeth on its outer circumference, and attaching the replacement wheel to the shaft, thereby causing the teeth of the replacement wheel to be circumferentially misaligned with respect to the teeth of the first wheel when the first wheel is attached to the shaft; A wrapping step comprising: shifting the position of the first endless member in the circumferential direction relative to the replacement wheel and wrapping the first endless member around the replacement wheel, or shifting the position of the second endless member in the circumferential direction relative to the second wheel and wrapping the second endless member around the second wheel; A method for manufacturing a traction device, including the traction device itself. <Claim 4> In the replacement process, the teeth of the replacement wheel are circumferentially offset from the teeth of the first wheel when the first wheel is attached to the shaft by an amount less than one pitch between the teeth of the first wheel and the replacement wheel. A method for manufacturing a traction device according to claim 3. <Claim 5> In the winding process, the circumferential displacement of the first endless member relative to the replacement wheel or the circumferential displacement of the second endless member relative to the second wheel changes the phase difference between the first endless member and the second endless member, and adjusts the inclination state of the movable body with respect to the first direction. A method for manufacturing a traction device according to claim 3 or 4. <Claim 6> When the first wheel is mounted on the shaft, the teeth of the first wheel are not circumferentially misaligned from the teeth of the second wheel, and when the replacement wheel is mounted on the shaft, the teeth of the replacement wheel are circumferentially misaligned from the teeth of the second wheel. A method for manufacturing a traction device according to claim 3 or 4. <Claim 7> The shaft has a projection at its end that protrudes radially outward from its outer circumference, The first wheel has a fitting hole in the center of its side surface, and a groove extending radially outward from the fitting hole on its side surface. The groove does not shift circumferentially from the diameter connecting the center of the first wheel to the apex of the teeth of the first wheel. The replacement wheel has a replacement fitting hole in the center of its side surface, and a replacement groove extending radially outward from the replacement fitting hole on its side surface. The replacement groove is circumferentially misaligned from the diameter connecting the center of the replacement wheel to the vertices of the teeth of the replacement wheel. Prior to the replacement process, the end of the shaft is fitted into the fitting hole, and the protruding portion is fitted into the groove. In the replacement process, the end of the shaft is moved from the fitting hole to the replacement fitting hole, and the protruding portion is moved from the groove to the replacement groove. A method for manufacturing a traction device according to claim 3 or 4. <Claim 8> A first endless member and a second endless member that are spaced apart from each other in a first direction and extend parallel to each other in a second direction perpendicular to the first direction, The first endless member is wrapped around a first wheel having teeth on its outer circumference, The second endless member is wrapped around a second wheel having teeth on its outer circumference, A shaft attached to the first wheel and the second wheel in a coaxial manner with the first wheel and the second wheel, The system includes a replacement wheel that is interchangeable with the first wheel and has teeth on its outer circumference, When the first wheel is replaced with the replacement wheel and the replacement wheel is mounted on the shaft, the teeth of the replacement wheel are circumferentially misaligned from the teeth of the first wheel when the first wheel is mounted on the shaft. Traction device. <Claim 9> When the first wheel is mounted on the shaft, the teeth of the first wheel are not circumferentially misaligned from the teeth of the second wheel, and when the replacement wheel is mounted on the shaft, the teeth of the replacement wheel are circumferentially misaligned from the teeth of the second wheel. The traction device according to claim 8. <Claim 10> The shaft has a projection at its end that protrudes radially outward from its outer circumference, The first wheel has a fitting hole in the center of its side surface, and a groove extending radially outward from the fitting hole on its side surface. The groove does not shift circumferentially from the diameter connecting the center of the first wheel to the apex of the teeth of the first wheel. The replacement wheel has a replacement fitting hole in the center of its side surface, and a replacement groove extending radially outward from the replacement fitting hole on its side surface. The replacement groove is circumferentially misaligned from the diameter connecting the center of the replacement wheel to the vertices of the teeth of the replacement wheel. The end of the shaft can be swapped from the fitting hole to the replacement fitting hole, and the protruding portion can be swapped from the groove to the replacement groove. The traction device according to claim 8 or 9. <Claim 11> A printing apparatus comprising the traction device according to claim 8 or 9. <Claim 12> A first wheel and a second wheel, which are mounted coaxially on the shaft, are interchangeable wheels that can be replaced with the first wheel. The first wheel has teeth on its outer circumference, The second wheel has teeth on its outer circumference, The replacement wheel has teeth on its outer circumference, When the first wheel is replaced with the replacement wheel and the replacement wheel is mounted on the shaft, the teeth of the replacement wheel are circumferentially misaligned from the teeth of the first wheel when the first wheel is mounted on the shaft. Replacement wheels. <Claim 13> When the first wheel is mounted on the shaft, the teeth of the first wheel are not circumferentially misaligned from the teeth of the second wheel, and when the replacement wheel is mounted on the shaft, the teeth of the replacement wheel are circumferentially misaligned from the teeth of the second wheel. The replacement wheel according to claim 12. <Claim 14> The shaft has a projection at its end that protrudes radially outward from its outer circumference, The first wheel has a fitting hole in the center of its side surface, and a groove extending radially outward from the fitting hole on its side surface. The groove does not shift circumferentially from the diameter connecting the center of the first wheel to the apex of the teeth of the first wheel. The replacement wheel has a replacement fitting hole in the center of its side surface, and a replacement groove extending radially outward from the replacement fitting hole on its side surface. The replacement groove is circumferentially misaligned from the diameter connecting the center of the replacement wheel to the vertices of the teeth of the replacement wheel. The end of the shaft can be swapped from the fitting hole to the replacement fitting hole, and the protruding portion can be swapped from the groove to the replacement groove. The replacement wheel according to claim 12 or 13. [Explanation of symbols]

[0087] 1 Printing device 25 Movable body 50 Traction device 59 shaft 59d Retaining pin (protruding part) 60R, 60L winding drive mechanism 61R Daiichi Wheel 61L Second Wheel 63R First endless member 63L Second endless member 61Ra Gear (First Wheel) 61Rb, 61Rc Gears (Replacement Wheels) 161Ra Mating hole (insertion hole) 161Rb, 161Rc Mating holes (replacement mating holes, insertion holes) 261Ra recessed groove (groove section, insertion hole) 261Rb, 261Rc recessed groove (replacement recessed groove, groove section, insertion hole) 361Ra diameter 361Rb diameter

Claims

1. A method for manufacturing a traction device that pulls a tractioned body from both ends of the tractioned body in a second direction perpendicular to the first direction by the rotation of a pair of toothed endless belts accompanying the rotation of a pair of gears connected by a shaft extending in a first direction, This includes an adjustment step to adjust the inclination state of the towed body with respect to the first direction by adjusting the relative circumferential position between the pair of gears, At least one of the pair of gears has a groove that extends in the diametrical direction of the gear, which serves as an insertion hole into which one end of the shaft is inserted, while the one end of the shaft has a projection that engages with the groove. The adjustment step involves selecting one of several gears in which the extension direction of the groove portion relative to the protruding direction of the teeth in the gear is different from that of the gear, thereby adjusting the inclination state of the traction body. A method for manufacturing a traction device.

2. A method for manufacturing a traction device in which a first endless member and a second endless member are spaced apart from each other in a first direction and extend in a second direction perpendicular to the first direction, a movable body is connected to the first endless member and the second endless member, the first endless member is wrapped around a first wheel having teeth on its outer circumference, the second endless member is wrapped around a second wheel having teeth on its outer circumference, the first wheel and the second wheel are mounted on the shaft coaxially with the shaft, and the first endless member and the second endless member pull the movable body in a first direction by the rotation of the shaft, the first wheel and the second wheel, A replacement step involves replacing the first wheel with a replacement wheel having teeth on its outer circumference, and attaching the replacement wheel to the shaft, thereby causing the teeth of the replacement wheel to be circumferentially misaligned with respect to the teeth of the first wheel when the first wheel is attached to the shaft; A wrapping step comprising: shifting the position of the first endless member in the circumferential direction relative to the replacement wheel and wrapping the first endless member around the replacement wheel, or shifting the position of the second endless member in the circumferential direction relative to the second wheel and wrapping the second endless member around the second wheel; A method for manufacturing a traction device, including the traction device itself.

3. In the replacement step, the teeth of the replacement wheel are circumferentially offset from the teeth of the first wheel when the first wheel is attached to the shaft by an amount less than one pitch between the teeth of the first wheel and the replacement wheel. A method for manufacturing a traction device according to claim 2.

4. In the winding step, the circumferential displacement of the first endless member relative to the replacement wheel or the circumferential displacement of the second endless member relative to the second wheel changes the phase difference between the first endless member and the second endless member and adjusts the inclination state of the movable body with respect to the first direction. A method for manufacturing a traction device according to claim 2 or 3.

5. When the first wheel is mounted on the shaft, the teeth of the first wheel are not circumferentially misaligned from the teeth of the second wheel, and when the replacement wheel is mounted on the shaft, the teeth of the replacement wheel are circumferentially misaligned from the teeth of the second wheel. A method for manufacturing a traction device according to claim 2 or 3.

6. The shaft has a projection at its end that protrudes radially outward from its outer circumference, The first wheel has a fitting hole in the center of its side surface, and a groove extending radially outward from the fitting hole on its side surface. The groove does not shift circumferentially from the diameter connecting the center of the first wheel to the apex of the teeth of the first wheel. The replacement wheel has a replacement fitting hole in the center of its side surface, and a replacement groove extending radially outward from the replacement fitting hole on its side surface. The replacement groove is circumferentially misaligned from the diameter connecting the center of the replacement wheel to the vertices of the teeth of the replacement wheel. Prior to the replacement process, the end of the shaft is fitted into the fitting hole, and the protruding portion is fitted into the groove. In the replacement process, the end of the shaft is moved from the fitting hole to the replacement fitting hole, and the protruding portion is moved from the groove to the replacement groove. A method for manufacturing a traction device according to claim 2 or 3.

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