JP2021094766A - Printing device - Google Patents

Abstract

To adjust an interval between a head and a platen and move the platen with a simple configuration.SOLUTION: A printing device (100) includes: a head unit (5) mounted with at least one head for printing on a roll sheet; a platen (6) for supporting a roll in a position facing the head unit (5); a link mechanism (9) for displacing the head unit (5) so as to change an interval to the platen (6); and a rotation mechanism (10) for changing a posture of the platen (6) between a first posture at printing and a second posture having a wider interval to the head unit (5) than the first posture. The link mechanism (9) and the rotation mechanism (10) are operated by the identical rotation force.SELECTED DRAWING: Figure 7

Description

The present invention relates to a printing apparatus that adjusts the position of a head and moves a platen.

Some printing devices such as printers are provided with a mechanism for adjusting the distance between the head and the platen that supports the sheet so as to keep the distance between the head and the sheet at a predetermined distance.

For example, Patent Document 1 discloses that the distance is adjusted by using an interval adjusting mechanism so that the distance from the head to the print medium is constant regardless of the thickness of the print medium.

JP-A-2019-123182

By the way, in a printing apparatus such as an inkjet printer, maintenance such as cleaning the head and removing foreign matter on the platen is performed. At this time, it is necessary to move the platen downward in order to separate the head and the platen.

In the conventional printing apparatus, a mechanism for adjusting the distance between the head and the platen and a mechanism for moving the platen are provided respectively, and these mechanisms are driven by a dedicated drive source. For this reason, there is a problem that the entire mechanism becomes complicated and the number of parts increases.

One aspect of the present invention is to adjust the distance between the head and the platen and move the platen with a simple configuration.

In order to solve the above problems, the printing apparatus according to one aspect of the present invention includes a head unit equipped with at least one head for printing on the medium, and a support unit for supporting the medium at a position facing the head unit. , Between a displacement mechanism that displaces the head unit so that the distance from the support unit changes, a first posture at the time of printing, and a second posture in which the distance from the head unit is wider than the first posture. The posture changing mechanism for changing the posture of the support unit is provided, and the displacement mechanism and the posture changing mechanism operate by the same rotational force. This rotational force is obtained by a drive source such as a single motor.

According to one aspect of the present invention, the distance between the head and the platen can be adjusted and the platen can be moved with a simple configuration.

It is a side view which shows the structure of the printing apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the head unit provided in the said printing apparatus. It is a perspective view which shows the structure of the platen provided in the said printing apparatus. It is a perspective view which shows the structure of the said platen seen from the angle different from FIG. It is a perspective view which shows the structure of the frame provided on the platen. It is a figure which shows the arrangement relation of the double gear, the drive gear and the partial gear provided in the platen. It is a side view which shows the structure of the main part including the platen and the head unit of the printing apparatus when the space between the platen in the 1st posture, and the head unit in the printing apparatus is the minimum. It is a side view which shows the structure of the main part including the platen and the head unit of the printing apparatus when the distance between the platen in the 1st posture and the head unit in the printing apparatus is the maximum. It is a side view which shows the structure of the main part including the platen and the head unit of the printing apparatus when the platen is in the 2nd posture in the printing apparatus.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG. 1 is a side view showing the configuration of the printing apparatus 100 according to the present embodiment. First, an outline of each part of the printing apparatus 100 will be described.

The printing apparatus 100 shown in FIG. 1 is an inkjet printing type label printer. As shown in FIG. 1, the printing apparatus 100 includes a housing 1, a main body frame 2, a roll paper holder 3, a transport roller pair 4, a head unit 5, a platen 6 as an example of a support unit, and maintenance. It is equipped with a unit 7.

The housing 1 is an exterior body that houses the main body frame 2, the roll paper holder 3, the transport roller pair 4, the head unit 5, the platen 6, and the maintenance unit 7. The main body frame 2 is a structure that holds the roll paper holder 3, the transport roller pair, the head unit 5, the platen 6, and the maintenance unit 7, and is made of metal.

The roll paper holder 3 holds the roll paper 31 as an example of the medium, and sends out the roll paper 31 by being rotationally driven by a motor (not shown). The roll paper 31 is wound around the roll paper holder 3 in a roll shape.

The transport roller pair 4 has a transport roller 4A and a pressing roller 4B, and is provided on a transport path on which the roll paper 31 is transported. The transport roller 4A is rotatably supported by the main body frame 2 and is rotationally driven by a motor (not shown). The pressing roller 4B is a roller that presses the roll paper 31 against the conveying roller 4A, and is rotatably provided on the main body frame 2. The transport roller pair 4 sandwiches the roll paper 31 and rotates to transport the roll paper 31 sent out from the roll paper holder 3 in the transport direction.

The head unit 5 is provided on the downstream side of the transport path in the transport direction from the transport roller pair 4 for printing on the roll paper 31. The head unit 5 is slidably held up and down by a support portion 2A provided on the main body frame 2. The support portion 2A is provided on the side surface side of the head unit 5 along one of the transport directions so as to extend upward from the upper end of the main body frame 2. The head unit 5 will be described in detail later.

The platen 6 is provided to support the roll paper 31 conveyed by the transfer roller pair 4 in the printing area of the head unit 5. The platen 6 supports the roll paper 31 at a position facing the head unit 5 below the head unit 5.

The platen 6 has a transport mechanism 61 for transporting the roll paper 31, which is arranged below the head unit 5. The transport mechanism 61 is a mechanism in which an endless transport belt 61C is hung on a drive roller 61A and a driven roller 61B arranged at intervals. The upper surface of the transport belt 61C serves as a transport surface for transporting the roll paper 31. The drive roller 61A and the driven roller 61B are rotatably supported by plates 65, 66 (see FIGS. 3 and 4) of the platen 6, which will be described later.

The platen 6 has a rotation support portion 62 at an end portion of the driven roller 61B. The platen 6 is supported by the main body frame 2 by the rotation support portion 62 so as to be rotatable by the rotation shaft 21 provided on the main body frame 2. As a result, the platen 6 takes a first posture at the time of printing shown by a solid line in FIG. 1 and a second posture shown by a two-dot chain line in FIG. 1 in which the distance between the platen 6 and the head unit is wider than that of the first posture. It becomes possible. The rotation mechanism 10 (see FIG. 3) that changes the posture of the platen 6 by rotating the platen 6 into the first posture and the second posture will be described in detail later.

The maintenance unit 7 is provided for performing maintenance such as cleaning of the head unit 5. The maintenance unit 7 is provided with a wiper for wiping the nozzle surfaces of the heads 52 to 54, which will be described later, a cap for covering the nozzle surfaces when printing is not performed, and the like. When maintenance such as printing is not performed, the maintenance unit 7 stands by at a standby position on the downstream side in the transport direction from the drive roller 61A, which is shown by a solid line in FIG. Further, the maintenance unit 7 moves to the maintenance position between the head unit 5 and the platen 6 shown by the alternate long and short dash line in FIG. 1 in a state where the platen 6 takes the second posture at the time of performing maintenance. .. Although not shown, the main body frame 2 is provided with a moving mechanism for moving the maintenance unit 7 between the standby position and the maintenance position.

Next, the head unit 5 will be described in detail. FIG. 2 is a perspective view showing the structure of the head unit 5. The head unit 5 has a case 51, heads 52 to 54, and positioning pins 55 to 59. The head unit 5 is equipped with three heads 52 to 54, but at least one head may be mounted.

The case 51 is formed in a box shape, and a tube or the like for introducing ink from the ink tank to the heads 52 to 54 is arranged inside. Heads 52 to 54 are attached to the head arrangement surface 51A facing the platen 6 of the case 51. The head unit 5 is arranged so that the head arrangement surface 51A faces downward.

The heads 52 and 53 are arranged at intervals in the width direction of the case 51, which is orthogonal to the transport direction and the thickness direction of the case 51. The head 52 is arranged downstream of the heads 52 and 53 in the transport direction and in the center of the case 51 in the width direction. The heads 52 to 54 have nozzle surfaces 52A to 54A provided with a large number of nozzles for ejecting ink.

The positioning pins 55 to 57 are arranged at intervals on one side edge portion of the head arrangement surface 51A along the transport direction. The positioning pins 55 to 57 are formed so as to project downward from the head arrangement surface 51A. The positioning pins 55 to 57 are provided for positioning in the height direction.

Positioning pins 58 and 59 as an example of the pins are arranged at intervals on the other side edge portion along the transport direction on the head arrangement surface 51A. The positioning pins 58 and 59 are formed so as to project downward from the head arrangement surface 51A. The positioning pins 58 and 59 are provided for positioning in the height direction and for restricting the position of the head unit 5 in the width direction. The head unit 5 may have at least two positioning pins 58, 59 in order to regulate the position in the width direction.

Subsequently, the platen 6 will be described in detail. FIG. 3 is a perspective view showing the configuration of the platen 6. FIG. 4 is a perspective view showing the configuration of the platen 6 when viewed from an angle different from that of FIG. FIG. 5 is a perspective view showing the structure of the frame 63 provided on the platen 6. FIG. 6 is a diagram showing the arrangement relationship of the double gear 82, the drive gear 83, and the partial gear 86 provided on the platen 6.

As shown in FIGS. 3 and 4, the platen 6 has a frame 63 and plates 65 and 66 in addition to the transport mechanism 61 and the rotation support portion 62 described above. Further, the platen 6 further includes a rotational force transmission mechanism 8, a link mechanism 9 as an example of a displacement mechanism, and a rotation mechanism 10 as an example of a posture change mechanism. The link mechanism displaces the head unit 5 so that the distance between the head unit 5 and the platen 6 changes.

As shown in FIG. 3, the frame 63 is arranged between the drive roller 61A and the driven roller 61B so as to hold the transport mechanism 61. Further, the plates 65 and 66 hold the driving roller 61A, the driven roller 61B, and the frame 63. As shown in FIG. 5, the frame 63 is formed in a box shape, and is firmly formed of a metal such as die-cast to support each component constituting the platen 6. The frame 63 has a top plate 63A and side walls 63B to 63E.

The top plate 63A is formed in a square shape. The side walls 63B to 63E are provided so as to surround the four sides of the top plate 63A. The side wall 63B is provided on the downstream side in the transport direction, and the side wall 63C is provided on the upstream side in the transport direction. The side walls 63B and 63C are arranged so as to face each other in the transport direction. The side walls 63D and 63E are arranged so as to face each other in a direction orthogonal to the transport direction and the thickness direction of the top plate 63A.

A long frame 631 is attached to the upper end of the side wall 63E along the transport direction. The long frame 631 has substantially the same length as the length of the side wall 63E in the transport direction. Further, inside the long frame 631, elongated holes 631A and 631B which are formed long in the transport direction and have a width slightly wider than the positioning pins 55 to 57 are formed. The elongated hole 631A is provided at the end of the side wall 63E on the side wall 63C side, and the elongated hole 631B is provided at the end of the side wall 63E on the side wall 63B side. As shown in FIG. 4, when the platen 6 is in the first posture described above, the positioning pin 58 of the head unit 5 is fitted into the elongated hole 631A, and the positioning pin 59 is fitted into the elongated hole 631B.

As a result, when the head unit 5 moves up and down while the platen 6 is in the first posture, the position of the head unit 5 is restricted in the width direction of the head unit 5, while the transport direction between the head unit 5 and the platen 6 Allows relative movement of. As a result, it is possible to prevent the head unit 5 from deviating in the width direction when the head unit 5 is raised and lowered.

Since the top plate 63A of the frame 63 comes into contact with the inner surface of the transport belt 61C, a plurality of ribs along the transport direction are formed on the surface facing the transport belt 61C so as to reduce friction with the transport belt 61C. You may.

The plate 65 is provided on the side wall 63D of the frame 63. The plate 66 is provided on the side wall 63E of the frame 63. The plates 65 and 66 are formed of metal in a shape that covers the side surface of the platen 6.

As shown in FIG. 3, the plate 65 is provided with a rotational force transmission mechanism 8 and a rotational mechanism 10. The partial gear 87, which is a part of the rotational force transmission mechanism 8, is provided on the plate 66. As shown in FIGS. 3 and 4, the link mechanism 9 is provided on both the plates 65 and 66.

The rotational force transmission mechanism 8 is a mechanism for transmitting a rotational force to both the link mechanism 9 and the rotational mechanism 10. The rotational force transmission mechanism 8 includes a motor 81, a double gear 82, a drive gear 83 as an example of the gear, a cam 85, and two partial gears 86 and 87.

The motor 81 outputs the generated rotational force to the screw shaft 81A. The screw shaft 81A has a screw formed on the outer periphery thereof, and is provided so as to extend in a direction orthogonal to the surface of the plate 65 and the transport direction.

The double gear 82 has a large-diameter gear 82A and a small-diameter gear 82B provided so as to be integrally overlapped with each other. The large-diameter gear 82A and the small-diameter gear 82B are coaxially supported on the plate 65. The small-diameter gear 82B is located closer to the plate 65, and the large-diameter gear 82A is located farther from the plate 65. The large-diameter gear 82A meshes with the screw shaft 81A, and the rotational force of the motor 81 is transmitted via the screw shaft 81A.

The drive gear 83 has an outer portion 83A and an inner portion 83B. The outer portion 38A and the inner portion 83B are integrally formed, the inner portion 83B is located on the side closer to the plate 65, and the outer portion 38A is located on the side far from the plate 65. Teeth are formed on a part of the entire circumference, for example, about 60% of the outer portion 38A and the inner portion 83B. The tooth portion of the drive gear 83 meshes with the small diameter gear 82B of the double gear 82. While the outer portion 38A has a circular shape, the inner portion 83B is fan-shaped by the notch 83B1 as shown in FIG.

The cam 85 is pivotally supported by the plate 65 by being formed on the flat surface of the outer portion 38A so as to be integrated with the drive gear 83, and is rotated by the rotational force transmitted from the double gear 82 integrally with the drive gear 83. Move. The end of the cam 85 projects in the radial direction of the drive gear 83 from the outer peripheral end of the drive gear 83. The cam 85 is arranged at a position on one end side of the notch 83B1.

The rotating mechanism 10 has a cam 85 and a contact plate 22 as an example of a support provided on the main body frame 2. The abutting plate 22 is fixed at a predetermined position on a side wall (not shown) facing the plate 65 side of the main body frame 2, and has a abutting surface 22A that abuts on the cam 85. The cam 85 is always in contact with the contact surface 22A. Further, the cam 85 is provided at a position separated from the rotation shaft 21 which is the rotation center of the platen 6. The rotation mechanism 10 sets the distance between the portion where the cam 85, which rotates integrally with the drive gear 83, comes into contact with the contact surface 22A as an example of the support surface, and the central axis of the cam 85, according to the rotation of the cam 85. By changing and rotating the platen 6, the posture of the platen 6 is changed.

The partial gear 86 is a partially toothed gear, is provided coaxially with the drive gear 83, and is arranged in the notch 83B1. The partial gear 86 is pivotally supported by the plate 65 so as to rotate freely with respect to the drive gear 83. The partial gear 86 has an elongated plate shape and has teeth formed at its tip.

The partial gear 87 is provided on the plate 66. The partial gear 87 is formed in the same shape as the partial gear 86, and is pivotally supported by the plate 66 at a position facing the partial gear 86. The partial gear 87 is included in the rotational force transmission mechanism 8 because the drive gear 83 does not transmit the rotational force of the motor 81 but has a function of assisting the rotation of the link mechanism 9.

As described above, the drive gear 83 is not included in the rotating mechanism 10, but may be included in the rotating mechanism 10 because it is integrally formed with the cam 85. In such a configuration, the rotating mechanism 10 has a rotating body 80. The rotating body 80 has a drive gear 83, a cam 85, and an abutting plate 22. The rotating body 80 is pivotally supported by the rotating shaft 80A on the plate 65.

As shown in FIGS. 3 and 4, the link mechanism 9 has two mounting plates 91 and two rotating members 92 and 93 as an example of the conversion mechanism. The mounting plate 91 is elongated so as to mount the head unit 5 on both sides of the frame 63 along the transport direction, and has a mounting portion 91A and a support portion 91B. The mounting portion 91A has a mounting surface substantially parallel to the top plate 63A. The support portion 91B is formed so as to extend in a direction orthogonal to the mounting surface of the mounting portion 91A.

Positioning pins 55 to 57 of the head unit 5 are mounted on the mounting portion 91A of the mounting plate 91 arranged on the plate 65 side. As shown in FIG. 4, the positioning pins 58 and 59 of the head unit 5 are mounted on the mounting portion 91A of the mounting plate 91 arranged on the plate 66 side.

The rotating members 92 and 93 are pivotally supported on the plates 65 and 66 so as to be rotatable. The tooth portion 92A provided at the tip of the rotating member 92 meshes with the teeth of the partial gear 86. Since the rotating member 93 is provided at a position away from the partial gear 86, it rotates freely. The upper ends of the rotating members 92 and 93, which are the ends on the mounting plate 91 side, are rotatably attached to the supporting portion 91B of the mounting plate 91, respectively.

The rotating member 92 rotates as the partial gear 86 rotates by meshing with the partial gear 86 at the tooth portion 92A. As a result, the height of the end portion of the rotating members 92 and 93 pivotally supported by the mounting plate 91, that is, the height of the mounting plate 91 changes. In this way, the rotating members 92 and 93 convert the rotational force transmitted from the partial gear 86 into motion in the vertical direction so as to raise and lower the mounting plate 91. The link mechanism 9 is configured to include the mounting plate 91 configured as described above and the rotating members 92 and 93, so that the link mechanism 9 moves up and down along the surfaces of the plates 65 and 66.

As described above, the motor 81, the double gear 82, the drive gear 83, and the rotating members 92 and 93 are attached to the plate 65. As a result, it is not necessary to separately use the motor 81, the double gear 82, the drive gear 83, and the members for attaching the rotating members 92 and 93. Therefore, the number of parts can be reduced.

The rotation support portion 62 is provided to rotatably support the platen 6 on the main body frame 2. The rotation support portion 62 is formed so as to project from the ends of the plates 65 and 66 on the driven roller 61B side in the direction opposite to the transport direction. A rotation shaft 21 is inserted through the rotation support portion 62. The rotating shaft 21 has a length slightly longer than that of the driven roller 61B, and is fixed to the main body frame 2.

Subsequently, the raising / lowering operation of the head unit 5 and the rotating operation of the platen 6 of the printing apparatus 100 configured as described above will be described. FIG. 7 is a side view showing the structure of a main part including the platen 6 and the head unit 5 of the printing apparatus 100 when the distance between the platen 6 in the first posture and the head unit 5 in the printing apparatus 100 is the minimum. is there. FIG. 8 is a side view showing the structure of a main part including the platen 6 and the head unit 5 of the printing apparatus 100 when the distance between the platen 6 in the first posture and the head unit 5 in the printing apparatus 100 is maximum. is there. FIG. 9 is a side view showing the structure of a main part including the platen 6 and the head unit 5 of the printing device 100 when the platen 6 is in the second posture in the printing device 100.

As shown in FIG. 7, when the platen 6 is in the first posture along the transport direction at the time of printing, the mounting plate 91 of the link mechanism 9 is in the lowest position. At this time, the head gap, which is the distance between the nozzle surfaces 52A to 53A of the heads 52 to 54 of the head unit 5 and the upper surface of the platen 6, is minimized.

When the double gear 82 rotates clockwise in FIG. 7 due to the rotation of the motor 81 from this state, the drive gear 83 that meshes with the small diameter gear 82B of the double gear 82 turns counterclockwise as an example of the first direction. Rotate. At this time, since one of the notched ends of the inner portion 83B of the drive gear 83 comes into contact with the partial gear 86, the partial gear 86 is pushed by the inner portion 83B to rotate integrally with the partial gear.

When the partial gear 86 rotates together with the drive gear 83 to the position shown in FIG. 8, the rotating member 92 that meshes with the partial gear 86 rotates clockwise in FIG. As a result, the position of the end portion of the rotating member 92 attached to the mounting plate 91 becomes higher than the position shown in FIG. As a result, the head gap is maximized. When the partial gear 86 is stopped at a position intermediate between the positions shown in FIGS. 7 and 8, the head gap can be set to the distance between the minimum and the maximum. The number of rotations of the motor 81 is predetermined so that the rotation of the drive gear 83 is stopped when the drive gear 83 rotates to the position shown in FIG.

As shown in FIG. 7, the cam 85 has a cam surface 851 including a first cam surface 851A and a second cam surface 851B. The first cam surface 851A is provided at a position at a first distance from the rotation shaft 80A. The second cam surface 851B is provided at a position second distance from the rotation shaft 80A, which is shorter than the first distance. When the rotating shaft 80A is in the posture shown in FIG. 7 and the posture shown in FIG. 8, the cam 85 hits the contact plate 22 at the first cam surface 851A located at the first distance farthest from the rotating shaft 80A. It is in contact with the contact surface 22A. As a result, the distance from the rotating shaft 80A to the contact portion where the first cam surface 85A comes into contact with the contact surface 22A becomes a constant first distance and does not change. As a result, the platen 6 does not rotate about the rotation shaft 21 and maintains the first posture. Further, in this state, the drive gear 83 constituting the main part of the rotating body 80 applies a rotational force to the rotating member 92 as described above.

From the state shown in FIG. 8, when the drive gear 83 rotates clockwise as an example of the second direction opposite to the first direction, the partial gear 86 is partially formed by the notched other end of the inner portion 83B. It does not rotate until it comes into contact with the gear 86. When the cam 85 rotates clockwise together with the drive gear 83 for a certain period in which the partial gear 86 does not rotate, as shown in FIG. 9, the cam 85 has a second cam 85 from one end of the first cam surface 851A to the vicinity of the rotation shaft 80A. The cam surface 851B comes into contact with the contact surface 22A. In this state, the distance from the rotating shaft 80A to the contact portion where the second cam surface 851B comes into contact with the contact surface 22A is a second distance shorter than the first distance. As a result, the platen 6 rotates downward about the rotation shaft 21 and takes an inclined second posture. Further, in this state, the drive gear 83 constituting the main part of the rotating body 80 does not apply a rotational force to the rotating member 92.

Further, from the state shown in FIG. 8, the partial gear 86 abuts on the other notched end of the inner portion 83B after a certain period in which the drive gear 83 rotates clockwise and does not rotate as described above. Then, while the platen 6 is rotating with the rotation of the cam 85, it rotates clockwise. Then, the rotating member 92 that meshes with the partial gear 86 rotates counterclockwise in FIG. As a result, the position of the end portion of the rotating member 92 attached to the mounting plate 91 returns to the same position as in FIG. 7, which is lower than the position shown in FIG.

Then, from the state shown in FIG. 9, when the drive gear 83 rotates counterclockwise, the partial gear 86 hits one of the notched ends of the inner portion 83B after a certain period of non-rotation as described above. When they come into contact with each other, they rotate together with the drive gear 83 and return to the position shown in FIG. At this time, the cam 85 rotates together with the drive gear 83 and returns to the position shown in FIG. In this state, the platen 6 has returned to the first position and the head gap is minimized.

As described above, the head unit 5 moves up and down by converting the rotational force into vertical movement by the rotation mechanism 10. Further, when the cam 85 is rotated by the rotational force and the distance from the central axis of the cam 85 to the contact portion of the cam 85 with the contact surface 22A changes, the platen 6 takes the first posture and the second posture. Rotate between. By converting the rotational force into motions in different directions in this way, the head unit 5 can be raised and lowered and the platen 6 can be rotated by the same rotational force.

As described above, in the printing device 100 of the present embodiment, since the link mechanism 9 and the rotation mechanism 10 operate by the same rotational force, the drive sources for generating the rotational force are the link mechanism 9 and the rotation mechanism 10, respectively. There is no need to provide it. As a result, it is possible to reduce the number of parts required for adjusting the distance between the head unit 5 and the platen 6 and changing the posture of the platen 6.

In the present embodiment, the configuration in which the printing device 100 is a label printer has been described. However, the present embodiment is not limited to a label printer, and is printed on a medium other than a sheet medium, such as printing on a case such as a mobile phone, a golf ball, or a tablet, or printing wiring on a circuit board. It can also be applied to devices.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

2 Main body frame 5 Head unit 6 Platen 8 Rotational force transmission mechanism 9 Link mechanism (displacement mechanism)
10 Rotation mechanism (posture change mechanism)
22 Contact plate (support)
22A Contact surface (support surface)
31 Roll paper (medium)
58,59 Positioning pin (pin)
61 Transport mechanism 63 Frame 65, 66 Plate 83 Drive gear (gear)
85 Cam 86 Partial gear 91 Mounting plate 92,93 Rotating member (conversion mechanism)
92A Tooth 100 Printing device 851 Cam surface 851A 1st cam surface 851B 2nd cam surface

Claims (11)

A head unit equipped with at least one head for printing on a medium,
A support unit that supports the medium at a position facing the head unit,
A displacement mechanism that displaces the head unit so that the distance from the support unit changes.
A posture changing mechanism for changing the posture of the support unit between the first posture at the time of printing and the second posture in which the distance from the head unit is wider than that of the first posture is provided.
The displacement mechanism and the posture change mechanism are printing devices that operate by the same rotational force. The printing apparatus according to claim 1, wherein the displacement mechanism raises and lowers the head unit. The displacement mechanism is
A mounting plate on which the head unit is mounted and
The printing apparatus according to claim 2, further comprising a conversion mechanism that converts the rotational force into a vertical motion so as to raise and lower the above-mentioned mounting plate. The support unit is a platen having a transport belt for transporting a medium, which is arranged below the head unit.
Further comprising a rotational force transmission mechanism having a motor that generates the rotational force, a gear that is rotated by the motor, and a partial gear that is coaxial with the gear and has partially teeth.
The platen has a frame for holding the transport belt and a plate provided on the side surface of the frame.
The conversion mechanism is
It is rotatably supported by the plate so as to move up and down along the surface of the plate, and is rotatably attached to the previously described plate at the upper end to form a link mechanism with the previously described plate. Has multiple rotating members
One of the rotating members has a tooth portion at the tip that meshes with the partial gear.
The gear rotates integrally with the partial gear when rotating in the first direction, and does not rotate the partial gear when rotating in the second direction opposite to the first direction. The printing apparatus according to claim 3, wherein the printing apparatus rotates integrally. The printing apparatus according to claim 4, wherein the motor, the gear, the partial gear, and the rotating member are attached to the plate. The posture change mechanism is
A rotating body that is pivotally supported by the support unit by a rotating shaft and has a cam surface,
With a support having a support surface for supporting the cam surface,
The cam surface includes a first cam surface provided at a position of a first distance from the rotation axis and a second cam surface provided at a position of a second distance from the rotation axis, which is shorter than the first distance. The printing apparatus according to any one of claims 3 to 5, wherein the printing apparatus has. The rotating body applies the rotational force to the conversion mechanism in a posture in which the first cam surface abuts on the support surface, and the conversion mechanism receives the rotational force in a posture in which the second cam surface abuts on the support surface. The printing apparatus according to claim 6, wherein no rotational force is applied. The posture change mechanism is
A cam that is pivotally supported by the support unit and rotates by the rotational force,
It has an abutting surface that is located below the cam and abuts on the cam.
When the support unit is in the first posture, the distance from the central axis of the cam to the contact portion of the cam that comes into contact with the contact surface is the first distance, and the support unit is in the second posture. The printing apparatus according to any one of claims 2 to 5, wherein at a certain time, the distance from the central axis of the cam to the contact portion becomes a second distance shorter than the first distance. The support unit is a platen having a transport mechanism for transporting the medium.
It also has a body frame to hold the medium,
The platen is rotatably supported by the body frame and is supported.
The printing apparatus according to claim 8, wherein the posture changing mechanism changes the posture of the platen by rotating the platen. The printing apparatus according to claim 9, wherein the cam is provided at a position separated from a rotation shaft on which the platen rotates. The head unit has at least two pins protruding downwards.
The frame has elongated holes formed long in the transport direction of the medium.
The printing apparatus according to claim 4 or 5, wherein the pin fits into the elongated hole when the platen is in the first posture.

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